[PATCH v2 0/17] Add support for OLPC XO 1.75 Embedded Controller

[PATCH v2 0/17] Add support for OLPC XO 1.75 Embedded Controller

[Lubomir Rintel]

Hi everyone!

This is a second spin of the patch set that adds support for the Embedded
Controller on an OLPC XO 1.75 machine.

OLPC XO 1.75 is a MMP2 based ARM laptop. It plugs into the existing OLPC
platform infrastructure, currently used by the x86 based models.
The slave mode support for MMP2's SPI controller that the EC is hooked to
is now in spi.git's for-4.21 branch.

The v1 received a fair number of comments. I've attempted to address all of
them, either by fixing things or responding to the v1 review.  See the
change logs in the individual patches for details.

If I've overlooked something then I apologize -- I haven't dealt with
a patch set as big as this and I'm struggling to incorporate the
feedback in an organized manner. Advice from the more experienced folks
around here are welcome.

Tested to work on an OLPC XO 1.75 and also tested not to break x86
support with an OLPC XO 1 machine. I don't have a XO 1.5, but it's
unlikely this breaks it when XO 1 works.

Lubo

[PATCH v2 01/17] power: supply: olpc_battery: correct the temperature units

[Lubomir Rintel]

According to [1] and [2], the temperature values are in tenths of degree
Celsius. Exposing the Celsius value makes the battery appear on fire:

  $ upower -i /org/freedesktop/UPower/devices/battery_olpc_battery
  ...
      temperature:         236.9 degrees C

Tested on OLPC XO-1 and OLPC XO-1.75 laptops.

[1] include/linux/power_supply.h
[2] Documentation/power/power_supply_class.txt

Fixes: fb972873a767 ("[BATTERY] One Laptop Per Child power/battery driver")
Cc: stable@vger.kernel.org
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- Add Fixes tag and an Ack

 drivers/power/supply/olpc_battery.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
index 6da79ae14860..5a97e42a3547 100644
--- a/drivers/power/supply/olpc_battery.c
+++ b/drivers/power/supply/olpc_battery.c
@@ -428,14 +428,14 @@ static int olpc_bat_get_property(struct power_supply *psy,
 		if (ret)
 			return ret;
 
-		val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256;
+		val->intval = (s16)be16_to_cpu(ec_word) * 10 / 256;
 		break;
 	case POWER_SUPPLY_PROP_TEMP_AMBIENT:
 		ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
 		if (ret)
 			return ret;
 
-		val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
+		val->intval = (int)be16_to_cpu(ec_word) * 10 / 256;
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 		ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
-- 
2.19.1

[PATCH v2 02/17] dt-bindings: olpc,xo1.75-ec: Add OLPC XO-1.75 EC bindings

[Lubomir Rintel]

The OLPC XO-1.75 Embedded Controller is a SPI master that uses extra
signals for handshaking. It needs to know when is the slave (Linux)
side's TX FIFO ready for transfer (the ready-gpio signal on the SPI
controller node) and when does it wish to respond with a command (the
cmd-gpio property).

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- s/cmd-gpio/cmd-gpios/
- s/ready-gpio/ready-gpios/ in the documentation paragraph
- Remove status = "okay" from the example

 .../bindings/misc/olpc,xo1.75-ec.txt          | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt

diff --git a/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt
new file mode 100644
index 000000000000..8c4d649cdd8f
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt
@@ -0,0 +1,23 @@
+OLPC XO-1.75 Embedded Controller
+
+Required properties:
+- compatible: Should be "olpc,xo1.75-ec".
+- cmd-gpios: gpio specifier of the CMD pin
+
+The embedded controller requires the SPI controller driver to signal readiness
+to receive a transfer (that is, when TX FIFO contains the response data) by
+strobing the ACK pin with the ready signal. See the "ready-gpios" property of the
+SSP binding as documented in:
+<Documentation/devicetree/bindings/spi/spi-pxa2xx.txt>.
+
+Example:
+	&ssp3 {
+		spi-slave;
+		ready-gpios = <&gpio 125 GPIO_ACTIVE_HIGH>;
+
+		slave {
+			compatible = "olpc,xo1.75-ec";
+			spi-cpha;
+			cmd-gpios = <&gpio 155 GPIO_ACTIVE_HIGH>;
+		};
+	};
-- 
2.19.1

[PATCH v2 03/17] Platform: OLPC: Remove an unused include

[Lubomir Rintel]

Also, the header is x86 specific, while there are non-x86 OLPC machines.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>
---
 drivers/platform/olpc/olpc-ec.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
index 374a8028fec7..981955dce926 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -17,7 +17,6 @@
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/olpc-ec.h>
-#include <asm/olpc.h>
 
 struct ec_cmd_desc {
 	u8 cmd;
-- 
2.19.1

[PATCH v2 04/17] Revert "platform/olpc: Make ec explicitly non-modular"

[Lubomir Rintel]

It doesn't make sense to always have this built-in, e.g. on ARM
multiplatform kernels.

A better way to address the problem the original commit aimed to solve is
to fix Kconfig. That is what the next commit in the series does.

This reverts commit f48d1496b8537d75776478c6942dd87f34d7f270.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

---
Changes since v1:
- Sort it later in the patch set

 drivers/platform/olpc/olpc-ec.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
index 981955dce926..35a21c66cd0d 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -1,8 +1,6 @@
 /*
  * Generic driver for the OLPC Embedded Controller.
  *
- * Author: Andres Salomon <dilinger@queued.net>
- *
  * Copyright (C) 2011-2012 One Laptop per Child Foundation.
  *
  * Licensed under the GPL v2 or later.
@@ -14,7 +12,7 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
-#include <linux/init.h>
+#include <linux/module.h>
 #include <linux/list.h>
 #include <linux/olpc-ec.h>
 
@@ -327,4 +325,8 @@ static int __init olpc_ec_init_module(void)
 {
 	return platform_driver_register(&olpc_ec_plat_driver);
 }
+
 arch_initcall(olpc_ec_init_module);
+
+MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
+MODULE_LICENSE("GPL");
-- 
2.19.1

[PATCH v2 05/17] Platform: OLPC: Move OLPC config symbol out of x86 tree

[Lubomir Rintel]

There are ARM OLPC machines that use mostly the same drivers, including
EC infrastructure, DCON and Battery.

While at that, fix Kconfig to allow building this as a module.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- Use 'depends on OLPC && X86' idiom (thanks Andy Shevchenko)

 arch/x86/Kconfig                  | 11 -----------
 drivers/input/mouse/Kconfig       |  3 ++-
 drivers/platform/Kconfig          |  2 ++
 drivers/platform/olpc/Kconfig     | 11 +++++++++++
 drivers/staging/olpc_dcon/Kconfig |  3 ++-
 5 files changed, 17 insertions(+), 13 deletions(-)
 create mode 100644 drivers/platform/olpc/Kconfig

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9d734f3c8234..f98f78e317d4 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2734,17 +2734,6 @@ config SCx200HR_TIMER
 	  processor goes idle (as is done by the scheduler).  The
 	  other workaround is idle=poll boot option.
 
-config OLPC
-	bool "One Laptop Per Child support"
-	depends on !X86_PAE
-	select GPIOLIB
-	select OF
-	select OF_PROMTREE
-	select IRQ_DOMAIN
-	---help---
-	  Add support for detecting the unique features of the OLPC
-	  XO hardware.
-
 config OLPC_XO1_PM
 	bool "OLPC XO-1 Power Management"
 	depends on OLPC && MFD_CS5535=y && PM_SLEEP
diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index 566a1e3aa504..cf12d0e4fba2 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -165,7 +165,8 @@ config MOUSE_PS2_TOUCHKIT
 
 config MOUSE_PS2_OLPC
 	bool "OLPC PS/2 mouse protocol extension"
-	depends on MOUSE_PS2 && OLPC
+	depends on MOUSE_PS2
+	depends on OLPC && X86
 	help
 	  Say Y here if you have an OLPC XO-1 laptop (with built-in
 	  PS/2 touchpad/tablet device).  The manufacturer calls the
diff --git a/drivers/platform/Kconfig b/drivers/platform/Kconfig
index d4c2e424a700..4313d73d3618 100644
--- a/drivers/platform/Kconfig
+++ b/drivers/platform/Kconfig
@@ -10,3 +10,5 @@ source "drivers/platform/goldfish/Kconfig"
 source "drivers/platform/chrome/Kconfig"
 
 source "drivers/platform/mellanox/Kconfig"
+
+source "drivers/platform/olpc/Kconfig"
diff --git a/drivers/platform/olpc/Kconfig b/drivers/platform/olpc/Kconfig
new file mode 100644
index 000000000000..7b736c9e67ac
--- /dev/null
+++ b/drivers/platform/olpc/Kconfig
@@ -0,0 +1,11 @@
+config OLPC
+	tristate "One Laptop Per Child support"
+	depends on X86 || ARM || COMPILE_TEST
+	depends on !X86_PAE
+	select GPIOLIB
+	select OF
+	select OF_PROMTREE if X86
+	select IRQ_DOMAIN
+	help
+	  Add support for detecting the unique features of the OLPC
+	  XO hardware.
diff --git a/drivers/staging/olpc_dcon/Kconfig b/drivers/staging/olpc_dcon/Kconfig
index 192cc8d0853f..ff540350f50f 100644
--- a/drivers/staging/olpc_dcon/Kconfig
+++ b/drivers/staging/olpc_dcon/Kconfig
@@ -1,8 +1,9 @@
 config FB_OLPC_DCON
 	tristate "One Laptop Per Child Display CONtroller support"
-	depends on OLPC && FB
+	depends on FB
 	depends on I2C
 	depends on BACKLIGHT_LCD_SUPPORT
+	depends on OLPC && X86
 	depends on (GPIO_CS5535 || GPIO_CS5535=n)
 	select BACKLIGHT_CLASS_DEVICE
 	help
-- 
2.19.1

[PATCH v2 06/17] Platform: OLPC: Add XO-1.75 EC driver

[Lubomir Rintel]

It's based off the driver from the OLPC kernel sources. Somewhat
modernized and cleaned up, for better or worse.

Modified to plug into the olpc-ec driver infrastructure (so that battery
interface and debugfs could be reused) and the SPI slave framework.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

---
Changes since v1:
- Cosmetic style changes; whitespace, ordering of declarations and
  #includes, remoted extra comas from sentinels
- Count the terminating NUL in LOG_BUF_SIZE
- Make olpc_xo175_ec_is_valid_cmd() return -EINVAL instead of -1
  on error
- Spell keyboard/touchpad in full for CHAN_KEYBOARD/TOUCHPAD messages
- Use a #define for PM wakeup processing time
- Log a message on unknown event
- Escape logging payload with %*pE
- Replace an open-coded min()
- Correct an error code on short read
- replaced PM callback #ifdefs with __maybe_unusedm SET_RUNTIME_PM_OPS
  and SET_NOIRQ_SYSTEM_SLEEP_PM_OPS
- dev_get_drvdata() instead of a round-trip through platform device
- s/unsigned char x/u8 x/ in olpc_xo175_ec_resume()
- Use GENMASK() instead of 0xffff for the event mask
- Replace cmd tx/resp rx buffers with structures
- Turned suspend hint arguments into a struct, and tidied up the comment

Basically all of the above is based on the review by Andy Shevchenko.

 drivers/platform/olpc/Kconfig         |  15 +
 drivers/platform/olpc/Makefile        |   1 +
 drivers/platform/olpc/olpc-xo175-ec.c | 763 ++++++++++++++++++++++++++
 3 files changed, 779 insertions(+)
 create mode 100644 drivers/platform/olpc/olpc-xo175-ec.c

diff --git a/drivers/platform/olpc/Kconfig b/drivers/platform/olpc/Kconfig
index 7b736c9e67ac..7c643d24ad0f 100644
--- a/drivers/platform/olpc/Kconfig
+++ b/drivers/platform/olpc/Kconfig
@@ -9,3 +9,18 @@ config OLPC
 	help
 	  Add support for detecting the unique features of the OLPC
 	  XO hardware.
+
+if OLPC
+
+config OLPC_XO175_EC
+	tristate "OLPC XO 1.75 Embedded Controller"
+	depends on ARCH_MMP || COMPILE_TEST
+	select SPI_SLAVE
+	help
+	  Include support for the OLPC XO Embedded Controller (EC). The EC
+	  provides various platform services, including support for the power,
+	  button, restart, shutdown and battery charging status.
+
+	  Unless you have an OLPC XO laptop, you will want to say N.
+
+endif
diff --git a/drivers/platform/olpc/Makefile b/drivers/platform/olpc/Makefile
index dc8b26bc7209..5b43f383289e 100644
--- a/drivers/platform/olpc/Makefile
+++ b/drivers/platform/olpc/Makefile
@@ -2,3 +2,4 @@
 # OLPC XO platform-specific drivers
 #
 obj-$(CONFIG_OLPC)		+= olpc-ec.o
+obj-$(CONFIG_OLPC_XO175_EC)	+= olpc-xo175-ec.o
diff --git a/drivers/platform/olpc/olpc-xo175-ec.c b/drivers/platform/olpc/olpc-xo175-ec.c
new file mode 100644
index 000000000000..74db06bacc44
--- /dev/null
+++ b/drivers/platform/olpc/olpc-xo175-ec.c
@@ -0,0 +1,763 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for the OLPC XO-1.75 Embedded Controller.
+ *
+ * The EC protocol is documented at:
+ * http://wiki.laptop.org/go/XO_1.75_HOST_to_EC_Protocol
+ *
+ * Copyright (C) 2010 One Laptop per Child Foundation.
+ * Copyright (C) 2018 Lubomir Rintel <lkundrak@v3.sk>
+ */
+
+#include <linux/completion.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/input.h>
+#include <linux/kfifo.h>
+#include <linux/module.h>
+#include <linux/olpc-ec.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/reboot.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/spi/spi.h>
+#include <asm/system_misc.h>
+
+struct ec_cmd_t {
+	u8 cmd;
+	u8 bytes_returned;
+};
+
+enum ec_chan_t {
+	CHAN_NONE = 0,
+	CHAN_SWITCH,
+	CHAN_CMD_RESP,
+	CHAN_KEYBOARD,
+	CHAN_TOUCHPAD,
+	CHAN_EVENT,
+	CHAN_DEBUG,
+	CHAN_CMD_ERROR,
+};
+
+/*
+ * EC events
+ */
+#define EVENT_AC_CHANGE			1  /* AC plugged/unplugged */
+#define EVENT_BATTERY_STATUS		2  /* Battery low/full/error/gone */
+#define EVENT_BATTERY_CRITICAL		3  /* Battery critical voltage */
+#define EVENT_BATTERY_SOC_CHANGE	4  /* 1% SOC Change */
+#define EVENT_BATTERY_ERROR		5  /* Abnormal error, query for cause */
+#define EVENT_POWER_PRESSED		6  /* Power button was pressed */
+#define EVENT_POWER_PRESS_WAKE		7  /* Woken up with a power button */
+#define EVENT_TIMED_HOST_WAKE		8  /* Host wake timer */
+#define EVENT_OLS_HIGH_LIMIT		9  /* OLS crossed dark threshold */
+#define EVENT_OLS_LOW_LIMIT		10 /* OLS crossed light threshold */
+
+/*
+ * EC commands
+ * (from http://dev.laptop.org/git/users/rsmith/ec-1.75/tree/ec_cmd.h)
+ */
+#define CMD_GET_API_VERSION		0x08 /* out: u8 */
+#define CMD_READ_VOLTAGE		0x10 /* out: u16, *9.76/32, mV */
+#define CMD_READ_CURRENT		0x11 /* out: s16, *15.625/120, mA */
+#define CMD_READ_ACR			0x12 /* out: s16, *6250/15, uAh */
+#define CMD_READ_BATT_TEMPERATURE	0x13 /* out: u16, *100/256, deg C */
+#define CMD_READ_AMBIENT_TEMPERATURE	0x14 /* unimplemented, no hardware */
+#define CMD_READ_BATTERY_STATUS		0x15 /* out: u8, bitmask */
+#define CMD_READ_SOC			0x16 /* out: u8, percentage */
+#define CMD_READ_GAUGE_ID		0x17 /* out: u8 * 8 */
+#define CMD_READ_GAUGE_DATA		0x18 /* in: u8 addr, out: u8 data */
+#define CMD_READ_BOARD_ID		0x19 /* out: u16 (platform id) */
+#define CMD_READ_BATT_ERR_CODE		0x1f /* out: u8, error bitmask */
+#define CMD_SET_DCON_POWER		0x26 /* in: u8 */
+#define CMD_RESET_EC			0x28 /* none */
+#define CMD_READ_BATTERY_TYPE		0x2c /* out: u8 */
+#define CMD_SET_AUTOWAK			0x33 /* out: u8 */
+#define CMD_SET_EC_WAKEUP_TIMER		0x36 /* in: u32, out: ? */
+#define CMD_READ_EXT_SCI_MASK		0x37 /* ? */
+#define CMD_WRITE_EXT_SCI_MASK		0x38 /* ? */
+#define CMD_CLEAR_EC_WAKEUP_TIMER	0x39 /* none */
+#define CMD_ENABLE_RUNIN_DISCHARGE	0x3B /* none */
+#define CMD_DISABLE_RUNIN_DISCHARGE	0x3C /* none */
+#define CMD_READ_MPPT_ACTIVE		0x3d /* out: u8 */
+#define CMD_READ_MPPT_LIMIT		0x3e /* out: u8 */
+#define CMD_SET_MPPT_LIMIT		0x3f /* in: u8 */
+#define CMD_DISABLE_MPPT		0x40 /* none */
+#define CMD_ENABLE_MPPT			0x41 /* none */
+#define CMD_READ_VIN			0x42 /* out: u16 */
+#define CMD_EXT_SCI_QUERY		0x43 /* ? */
+#define RSP_KEYBOARD_DATA		0x48 /* ? */
+#define RSP_TOUCHPAD_DATA		0x49 /* ? */
+#define CMD_GET_FW_VERSION		0x4a /* out: u8 * 16 */
+#define CMD_POWER_CYCLE			0x4b /* none */
+#define CMD_POWER_OFF			0x4c /* none */
+#define CMD_RESET_EC_SOFT		0x4d /* none */
+#define CMD_READ_GAUGE_U16		0x4e /* ? */
+#define CMD_ENABLE_MOUSE		0x4f /* ? */
+#define CMD_ECHO			0x52 /* in: u8 * 5, out: u8 * 5 */
+#define CMD_GET_FW_DATE			0x53 /* out: u8 * 16 */
+#define CMD_GET_FW_USER			0x54 /* out: u8 * 16 */
+#define CMD_TURN_OFF_POWER		0x55 /* none (same as 0x4c) */
+#define CMD_READ_OLS			0x56 /* out: u16 */
+#define CMD_OLS_SMT_LEDON		0x57 /* none */
+#define CMD_OLS_SMT_LEDOFF		0x58 /* none */
+#define CMD_START_OLS_ASSY		0x59 /* none */
+#define CMD_STOP_OLS_ASSY		0x5a /* none */
+#define CMD_OLS_SMTTEST_STOP		0x5b /* none */
+#define CMD_READ_VIN_SCALED		0x5c /* out: u16 */
+#define CMD_READ_BAT_MIN_W		0x5d /* out: u16 */
+#define CMD_READ_BAR_MAX_W		0x5e /* out: u16 */
+#define CMD_RESET_BAT_MINMAX_W		0x5f /* none */
+#define CMD_READ_LOCATION		0x60 /* in: u16 addr, out: u8 data */
+#define CMD_WRITE_LOCATION		0x61 /* in: u16 addr, u8 data */
+#define CMD_KEYBOARD_CMD		0x62 /* in: u8, out: ? */
+#define CMD_TOUCHPAD_CMD		0x63 /* in: u8, out: ? */
+#define CMD_GET_FW_HASH			0x64 /* out: u8 * 16 */
+#define CMD_SUSPEND_HINT		0x65 /* in: u8 */
+#define CMD_ENABLE_WAKE_TIMER		0x66 /* in: u8 */
+#define CMD_SET_WAKE_TIMER		0x67 /* in: 32 */
+#define CMD_ENABLE_WAKE_AUTORESET	0x68 /* in: u8 */
+#define CMD_OLS_SET_LIMITS		0x69 /* in: u16, u16 */
+#define CMD_OLS_GET_LIMITS		0x6a /* out: u16, u16 */
+#define CMD_OLS_SET_CEILING		0x6b /* in: u16 */
+#define CMD_OLS_GET_CEILING		0x6c /* out: u16 */
+
+/*
+ * Accepted EC commands, and how many bytes they return. There are plenty
+ * of EC commands that are no longer implemented, or are implemented only on
+ * certain older boards.
+ */
+static const struct ec_cmd_t olpc_xo175_ec_cmds[] = {
+	{ CMD_GET_API_VERSION, 1 },
+	{ CMD_READ_VOLTAGE, 2 },
+	{ CMD_READ_CURRENT, 2 },
+	{ CMD_READ_ACR, 2 },
+	{ CMD_READ_BATT_TEMPERATURE, 2 },
+	{ CMD_READ_BATTERY_STATUS, 1 },
+	{ CMD_READ_SOC, 1 },
+	{ CMD_READ_GAUGE_ID, 8 },
+	{ CMD_READ_GAUGE_DATA, 1 },
+	{ CMD_READ_BOARD_ID, 2 },
+	{ CMD_READ_BATT_ERR_CODE, 1 },
+	{ CMD_SET_DCON_POWER, 0 },
+	{ CMD_RESET_EC, 0 },
+	{ CMD_READ_BATTERY_TYPE, 1 },
+	{ CMD_ENABLE_RUNIN_DISCHARGE, 0 },
+	{ CMD_DISABLE_RUNIN_DISCHARGE, 0 },
+	{ CMD_READ_MPPT_ACTIVE, 1 },
+	{ CMD_READ_MPPT_LIMIT, 1 },
+	{ CMD_SET_MPPT_LIMIT, 0 },
+	{ CMD_DISABLE_MPPT, 0 },
+	{ CMD_ENABLE_MPPT, 0 },
+	{ CMD_READ_VIN, 2 },
+	{ CMD_GET_FW_VERSION, 16 },
+	{ CMD_POWER_CYCLE, 0 },
+	{ CMD_POWER_OFF, 0 },
+	{ CMD_RESET_EC_SOFT, 0 },
+	{ CMD_ECHO, 5 },
+	{ CMD_GET_FW_DATE, 16 },
+	{ CMD_GET_FW_USER, 16 },
+	{ CMD_TURN_OFF_POWER, 0 },
+	{ CMD_READ_OLS, 2 },
+	{ CMD_OLS_SMT_LEDON, 0 },
+	{ CMD_OLS_SMT_LEDOFF, 0 },
+	{ CMD_START_OLS_ASSY, 0 },
+	{ CMD_STOP_OLS_ASSY, 0 },
+	{ CMD_OLS_SMTTEST_STOP, 0 },
+	{ CMD_READ_VIN_SCALED, 2 },
+	{ CMD_READ_BAT_MIN_W, 2 },
+	{ CMD_READ_BAR_MAX_W, 2 },
+	{ CMD_RESET_BAT_MINMAX_W, 0 },
+	{ CMD_READ_LOCATION, 1 },
+	{ CMD_WRITE_LOCATION, 0 },
+	{ CMD_GET_FW_HASH, 16 },
+	{ CMD_SUSPEND_HINT, 0 },
+	{ CMD_ENABLE_WAKE_TIMER, 0 },
+	{ CMD_SET_WAKE_TIMER, 0 },
+	{ CMD_ENABLE_WAKE_AUTORESET, 0 },
+	{ CMD_OLS_SET_LIMITS, 0 },
+	{ CMD_OLS_GET_LIMITS, 4 },
+	{ CMD_OLS_SET_CEILING, 0 },
+	{ CMD_OLS_GET_CEILING, 2 },
+	{ CMD_READ_EXT_SCI_MASK, 2 },
+	{ CMD_WRITE_EXT_SCI_MASK, 0 },
+
+	{ }
+};
+
+#define EC_MAX_CMD_DATA_LEN	5
+#define EC_MAX_RESP_LEN		16
+
+#define LOG_BUF_SIZE		128
+
+#define PM_WAKEUP_TIME		1000
+
+#define EC_ALL_EVENTS		GENMASK(15, 0)
+
+enum ec_state_t {
+	CMD_STATE_IDLE = 0,
+	CMD_STATE_WAITING_FOR_SWITCH,
+	CMD_STATE_CMD_IN_TX_FIFO,
+	CMD_STATE_CMD_SENT,
+	CMD_STATE_RESP_RECEIVED,
+	CMD_STATE_ERROR_RECEIVED,
+};
+
+struct olpc_xo175_ec_cmd {
+	u8 command;
+	u8 nr_args;
+	u8 data_len;
+	u8 args[EC_MAX_CMD_DATA_LEN];
+};
+
+struct olpc_xo175_ec_resp {
+	u8 channel;
+	u8 byte;
+};
+
+struct olpc_xo175_ec {
+	bool suspended;
+
+	/* SPI related stuff. */
+	struct spi_device *spi;
+	struct spi_transfer xfer;
+	struct spi_message msg;
+	union {
+		struct olpc_xo175_ec_cmd cmd;
+		struct olpc_xo175_ec_resp resp;
+	} tx_buf, rx_buf;
+
+	/* GPIO for the CMD signals. */
+	struct gpio_desc *gpio_cmd;
+
+	/* Command handling related state. */
+	spinlock_t cmd_state_lock;
+	int cmd_state;
+	bool cmd_running;
+	struct completion cmd_done;
+	struct olpc_xo175_ec_cmd cmd;
+	u8 resp_data[EC_MAX_RESP_LEN];
+	int expected_resp_len;
+	int resp_len;
+
+	/* Power button. */
+	struct input_dev *pwrbtn;
+
+	/* Debug handling. */
+	char logbuf[LOG_BUF_SIZE];
+	int logbuf_len;
+};
+
+static struct platform_device *olpc_ec;
+
+static int olpc_xo175_ec_is_valid_cmd(u8 cmd)
+{
+	const struct ec_cmd_t *p;
+
+	for (p = olpc_xo175_ec_cmds; p->cmd; p++) {
+		if (p->cmd == cmd)
+			return p->bytes_returned;
+	}
+
+	return -EINVAL;
+}
+
+static void olpc_xo175_ec_flush_logbuf(struct olpc_xo175_ec *priv)
+{
+	dev_dbg(&priv->spi->dev, "got debug string [%*pE]\n",
+				priv->logbuf_len, priv->logbuf);
+	priv->logbuf_len = 0;
+}
+
+static void olpc_xo175_ec_complete(void *arg);
+
+static void olpc_xo175_ec_send_command(struct olpc_xo175_ec *priv, void *cmd,
+								size_t cmdlen)
+{
+	int ret;
+
+	memcpy(&priv->tx_buf, cmd, cmdlen);
+	priv->xfer.len = cmdlen;
+
+	spi_message_init_with_transfers(&priv->msg, &priv->xfer, 1);
+
+	priv->msg.complete = olpc_xo175_ec_complete;
+	priv->msg.context = priv;
+
+	ret = spi_async(priv->spi, &priv->msg);
+	if (ret)
+		dev_err(&priv->spi->dev, "spi_async() failed %d\n", ret);
+}
+
+static void olpc_xo175_ec_read_packet(struct olpc_xo175_ec *priv)
+{
+	u8 nonce[] = {0xA5, 0x5A};
+
+	olpc_xo175_ec_send_command(priv, nonce, sizeof(nonce));
+}
+
+static void olpc_xo175_ec_complete(void *arg)
+{
+	struct olpc_xo175_ec *priv = arg;
+	struct device *dev = &priv->spi->dev;
+	struct power_supply *psy;
+	unsigned long flags;
+	u8 channel;
+	u8 byte;
+	int ret;
+
+	ret = priv->msg.status;
+	if (ret) {
+		dev_err(dev, "SPI transfer failed: %d\n", ret);
+
+		spin_lock_irqsave(&priv->cmd_state_lock, flags);
+		if (priv->cmd_running) {
+			priv->resp_len = 0;
+			priv->cmd_state = CMD_STATE_ERROR_RECEIVED;
+			complete(&priv->cmd_done);
+		}
+		spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
+
+		if (ret != -EINTR)
+			olpc_xo175_ec_read_packet(priv);
+
+		return;
+	}
+
+	channel = priv->rx_buf.resp.channel;
+	byte = priv->rx_buf.resp.byte;
+
+	switch (channel) {
+	case CHAN_NONE:
+		spin_lock_irqsave(&priv->cmd_state_lock, flags);
+
+		if (!priv->cmd_running) {
+			/* We can safely ignore these */
+			dev_err(dev, "spurious FIFO read packet\n");
+			spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
+			return;
+		}
+
+		priv->cmd_state = CMD_STATE_CMD_SENT;
+		if (!priv->expected_resp_len)
+			complete(&priv->cmd_done);
+		olpc_xo175_ec_read_packet(priv);
+
+		spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
+		return;
+
+	case CHAN_SWITCH:
+		spin_lock_irqsave(&priv->cmd_state_lock, flags);
+
+		if (!priv->cmd_running) {
+			/* Just go with the flow */
+			dev_err(dev, "spurious SWITCH packet\n");
+			memset(&priv->cmd, 0, sizeof(priv->cmd));
+			priv->cmd.command = CMD_ECHO;
+		}
+
+		priv->cmd_state = CMD_STATE_CMD_IN_TX_FIFO;
+
+		/* Throw command into TxFIFO */
+		gpiod_set_value_cansleep(priv->gpio_cmd, 0);
+		olpc_xo175_ec_send_command(priv, &priv->cmd, sizeof(priv->cmd));
+
+		spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
+		return;
+
+	case CHAN_CMD_RESP:
+		spin_lock_irqsave(&priv->cmd_state_lock, flags);
+
+		if (!priv->cmd_running) {
+			dev_err(dev, "spurious response packet\n");
+		} else if (priv->resp_len >= priv->expected_resp_len) {
+			dev_err(dev, "too many response packets\n");
+		} else {
+			priv->resp_data[priv->resp_len++] = byte;
+			if (priv->resp_len == priv->expected_resp_len) {
+				priv->cmd_state = CMD_STATE_RESP_RECEIVED;
+				complete(&priv->cmd_done);
+			}
+		}
+
+		spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
+		break;
+
+	case CHAN_CMD_ERROR:
+		spin_lock_irqsave(&priv->cmd_state_lock, flags);
+
+		if (!priv->cmd_running) {
+			dev_err(dev, "spurious cmd error packet\n");
+		} else {
+			priv->resp_data[0] = byte;
+			priv->resp_len = 1;
+			priv->cmd_state = CMD_STATE_ERROR_RECEIVED;
+			complete(&priv->cmd_done);
+		}
+		spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
+		break;
+
+	case CHAN_KEYBOARD:
+		dev_warn(dev, "keyboard is not supported\n");
+		break;
+
+	case CHAN_TOUCHPAD:
+		dev_warn(dev, "touchpad is not supported\n");
+		break;
+
+	case CHAN_EVENT:
+		dev_dbg(dev, "got event %.2x\n", byte);
+		switch (byte) {
+		case EVENT_AC_CHANGE:
+			psy = power_supply_get_by_name("olpc-ac");
+			if (psy) {
+				power_supply_changed(psy);
+				power_supply_put(psy);
+			}
+			break;
+		case EVENT_BATTERY_STATUS:
+		case EVENT_BATTERY_CRITICAL:
+		case EVENT_BATTERY_SOC_CHANGE:
+		case EVENT_BATTERY_ERROR:
+			psy = power_supply_get_by_name("olpc-battery");
+			if (psy) {
+				power_supply_changed(psy);
+				power_supply_put(psy);
+			}
+			break;
+		case EVENT_POWER_PRESSED:
+			input_report_key(priv->pwrbtn, KEY_POWER, 1);
+			input_sync(priv->pwrbtn);
+			input_report_key(priv->pwrbtn, KEY_POWER, 0);
+			input_sync(priv->pwrbtn);
+			/* fall through */
+		case EVENT_POWER_PRESS_WAKE:
+		case EVENT_TIMED_HOST_WAKE:
+			pm_wakeup_event(priv->pwrbtn->dev.parent,
+						PM_WAKEUP_TIME);
+			break;
+		default:
+			dev_dbg(dev, "ignored unknown event %.2x\n", byte);
+			break;
+		}
+		break;
+
+	case CHAN_DEBUG:
+		if (byte == '\n') {
+			olpc_xo175_ec_flush_logbuf(priv);
+		} else if (isprint(byte)) {
+			priv->logbuf[priv->logbuf_len++] = byte;
+			if (priv->logbuf_len == LOG_BUF_SIZE)
+				olpc_xo175_ec_flush_logbuf(priv);
+		}
+		break;
+
+	default:
+		dev_warn(dev, "unknown channel: %d, %.2x\n", channel, byte);
+		break;
+	}
+
+	/* Most non-command packets get the TxFIFO refilled and an ACK. */
+	olpc_xo175_ec_read_packet(priv);
+}
+
+/*
+ * This function is protected with a mutex. We can safely assume that
+ * there will be only one instance of this function running at a time.
+ * One of the ways in which we enforce this is by waiting until we get
+ * all response bytes back from the EC, rather than just the number that
+ * the caller requests (otherwise, we might start a new command while an
+ * old command's response bytes are still incoming).
+ */
+static int olpc_xo175_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *resp,
+					size_t resp_len, void *ec_cb_arg)
+{
+	struct olpc_xo175_ec *priv = ec_cb_arg;
+	struct device *dev = &priv->spi->dev;
+	unsigned long flags;
+	size_t nr_bytes;
+	int ret = 0;
+
+	dev_dbg(dev, "CMD %x, %d bytes expected\n", cmd, resp_len);
+
+	if (inlen > 5) {
+		dev_err(dev, "command len %d too big!\n", resp_len);
+		return -EOVERFLOW;
+	}
+
+	/* Suspending in the middle of an EC command hoses things badly! */
+	if (WARN_ON(priv->suspended))
+		return -EBUSY;
+
+	/* Ensure a valid command and return bytes */
+	nr_bytes = olpc_xo175_ec_is_valid_cmd(cmd);
+	if (nr_bytes < 0) {
+		dev_err_ratelimited(dev, "unknown command 0x%x\n", cmd);
+
+		/*
+		 * Assume the best in our callers, and allow unknown commands
+		 * through. I'm not the charitable type, but it was beaten
+		 * into me. Just maintain a minimum standard of sanity.
+		 */
+		if (resp_len > sizeof(priv->resp_data)) {
+			dev_err(dev, "response too big: %d!\n", resp_len);
+			return -EOVERFLOW;
+		}
+		nr_bytes = resp_len;
+	}
+	resp_len = min(resp_len, nr_bytes);
+
+	spin_lock_irqsave(&priv->cmd_state_lock, flags);
+
+	/* Initialize the state machine */
+	init_completion(&priv->cmd_done);
+	priv->cmd_running = true;
+	priv->cmd_state = CMD_STATE_WAITING_FOR_SWITCH;
+	memset(&priv->cmd, 0, sizeof(priv->cmd));
+	priv->cmd.command = cmd;
+	priv->cmd.nr_args = inlen;
+	priv->cmd.data_len = 0;
+	memcpy(priv->cmd.args, inbuf, inlen);
+	priv->expected_resp_len = nr_bytes;
+	priv->resp_len = 0;
+
+	/* Tickle the cmd gpio to get things started */
+	gpiod_set_value_cansleep(priv->gpio_cmd, 1);
+
+	spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
+
+	/* The irq handler should do the rest */
+	if (!wait_for_completion_timeout(&priv->cmd_done,
+			msecs_to_jiffies(4000))) {
+		dev_err(dev, "EC cmd error: timeout in STATE %d\n",
+				priv->cmd_state);
+		gpiod_set_value_cansleep(priv->gpio_cmd, 0);
+		spi_slave_abort(priv->spi);
+		olpc_xo175_ec_read_packet(priv);
+		return -ETIMEDOUT;
+	}
+
+	spin_lock_irqsave(&priv->cmd_state_lock, flags);
+
+	/* Deal with the results. */
+	if (priv->cmd_state == CMD_STATE_ERROR_RECEIVED) {
+		/* EC-provided error is in the single response byte */
+		dev_err(dev, "command 0x%x returned error 0x%x\n",
+						cmd, priv->resp_data[0]);
+		ret = -EREMOTEIO;
+	} else if (priv->resp_len != nr_bytes) {
+		dev_err(dev, "command 0x%x returned %d bytes, expected %d bytes\n",
+						cmd, priv->resp_len, nr_bytes);
+		ret = -EREMOTEIO;
+	} else {
+		/*
+		 * We may have 8 bytes in priv->resp, but we only care about
+		 * what we've been asked for. If the caller asked for only 2
+		 * bytes, give them that. We've guaranteed that
+		 * resp_len <= priv->resp_len and priv->resp_len == nr_bytes.
+		 */
+		memcpy(resp, priv->resp_data, resp_len);
+	}
+
+	/* This should already be low, but just in case. */
+	gpiod_set_value_cansleep(priv->gpio_cmd, 0);
+	priv->cmd_running = false;
+
+	spin_unlock_irqrestore(&priv->cmd_state_lock, flags);
+
+	return ret;
+}
+
+static int olpc_xo175_ec_set_event_mask(unsigned int mask)
+{
+	unsigned char args[2];
+
+	args[0] = (mask >> 0) & 0xff;
+	args[1] = (mask >> 8) & 0xff;
+	return olpc_ec_cmd(CMD_WRITE_EXT_SCI_MASK, args, 2, NULL, 0);
+}
+
+static void olpc_xo175_ec_restart(enum reboot_mode mode, const char *cmd)
+{
+	while (1) {
+		olpc_ec_cmd(CMD_POWER_CYCLE, NULL, 0, NULL, 0);
+		mdelay(1000);
+	}
+}
+
+static void olpc_xo175_ec_power_off(void)
+{
+	while (1) {
+		olpc_ec_cmd(CMD_POWER_OFF, NULL, 0, NULL, 0);
+		mdelay(1000);
+	}
+}
+
+static int __maybe_unused olpc_xo175_ec_suspend(struct device *dev)
+{
+	struct olpc_xo175_ec *priv = dev_get_drvdata(dev);
+	static struct {
+		u8 suspend;
+		u32 suspend_count;
+	} __packed hintargs;
+	static unsigned int suspend_count;
+
+	/*
+	 * SOC_SLEEP is not wired to the EC on B3 and earlier boards.
+	 * This command lets the EC know instead. The suspend count doesn't seem
+	 * to be used anywhere but in the EC debug output.
+	 */
+	hintargs.suspend = 1;
+	hintargs.suspend_count = suspend_count++;
+	olpc_ec_cmd(CMD_SUSPEND_HINT, (void *)&hintargs, sizeof(hintargs),
+								NULL, 0);
+
+	/*
+	 * After we've sent the suspend hint, don't allow further EC commands
+	 * to be run until we've resumed. Userspace tasks should be frozen,
+	 * but kernel threads and interrupts could still schedule EC commands.
+	 */
+	priv->suspended = true;
+
+	return 0;
+}
+
+static int __maybe_unused olpc_xo175_ec_resume_noirq(struct device *dev)
+{
+	struct olpc_xo175_ec *priv = dev_get_drvdata(dev);
+
+	priv->suspended = false;
+
+	return 0;
+}
+
+static int __maybe_unused olpc_xo175_ec_resume(struct device *dev)
+{
+	u8 x = 0;
+
+	/*
+	 * The resume hint is only needed if no other commands are
+	 * being sent during resume. all it does is tell the EC
+	 * the SoC is definitely awake.
+	 */
+	olpc_ec_cmd(CMD_SUSPEND_HINT, &x, 1, NULL, 0);
+
+	/* Enable all EC events while we're awake */
+	olpc_xo175_ec_set_event_mask(EC_ALL_EVENTS);
+
+	return 0;
+}
+
+static struct olpc_ec_driver olpc_xo175_ec_driver = {
+	.ec_cmd = olpc_xo175_ec_cmd,
+};
+
+static int olpc_xo175_ec_remove(struct spi_device *spi)
+{
+	if (pm_power_off == olpc_xo175_ec_power_off)
+		pm_power_off = NULL;
+	if (arm_pm_restart == olpc_xo175_ec_restart)
+		arm_pm_restart = NULL;
+
+	spi_slave_abort(spi);
+
+	platform_device_unregister(olpc_ec);
+	olpc_ec = NULL;
+
+	return 0;
+}
+
+static int olpc_xo175_ec_probe(struct spi_device *spi)
+{
+	struct olpc_xo175_ec *priv;
+	int ret;
+
+	if (olpc_ec) {
+		dev_err(&spi->dev, "OLPC EC already registered.\n");
+		return -EBUSY;
+	}
+
+	priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->gpio_cmd = devm_gpiod_get(&spi->dev, "cmd", GPIOD_OUT_LOW);
+	if (IS_ERR(priv->gpio_cmd)) {
+		dev_err(&spi->dev, "failed to get cmd gpio: %ld\n",
+					PTR_ERR(priv->gpio_cmd));
+		return PTR_ERR(priv->gpio_cmd);
+	}
+
+	priv->spi = spi;
+
+	spin_lock_init(&priv->cmd_state_lock);
+	priv->cmd_state = CMD_STATE_IDLE;
+	init_completion(&priv->cmd_done);
+
+	priv->logbuf_len = 0;
+
+	/* Set up power button input device */
+	priv->pwrbtn = devm_input_allocate_device(&spi->dev);
+	if (!priv->pwrbtn)
+		return -ENOMEM;
+	priv->pwrbtn->name = "Power Button";
+	priv->pwrbtn->dev.parent = &spi->dev;
+	input_set_capability(priv->pwrbtn, EV_KEY, KEY_POWER);
+	ret = input_register_device(priv->pwrbtn);
+	if (ret) {
+		dev_err(&spi->dev, "error registering input device: %d\n", ret);
+		return ret;
+	}
+
+	spi_set_drvdata(spi, priv);
+
+	priv->xfer.rx_buf = &priv->rx_buf;
+	priv->xfer.tx_buf = &priv->tx_buf;
+
+	olpc_xo175_ec_read_packet(priv);
+
+	olpc_ec_driver_register(&olpc_xo175_ec_driver, priv);
+	olpc_ec = platform_device_register_resndata(&spi->dev, "olpc-ec", -1,
+							NULL, 0, NULL, 0);
+
+	/* Enable all EC events while we're awake */
+	olpc_xo175_ec_set_event_mask(EC_ALL_EVENTS);
+
+	if (pm_power_off == NULL)
+		pm_power_off = olpc_xo175_ec_power_off;
+	if (arm_pm_restart == NULL)
+		arm_pm_restart = olpc_xo175_ec_restart;
+
+	dev_info(&spi->dev, "OLPC XO-1.75 Embedded Controller driver\n");
+
+	return 0;
+}
+
+static const struct dev_pm_ops olpc_xo175_ec_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, olpc_xo175_ec_resume_noirq)
+	SET_RUNTIME_PM_OPS(olpc_xo175_ec_suspend, olpc_xo175_ec_resume, NULL)
+};
+
+static const struct of_device_id olpc_xo175_ec_of_match[] = {
+	{ .compatible = "olpc,xo1.75-ec" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, olpc_xo175_ec_of_match);
+
+static struct spi_driver olpc_xo175_ec_spi_driver = {
+	.driver = {
+		.name	= "olpc-xo175-ec",
+		.of_match_table = olpc_xo175_ec_of_match,
+		.pm = &olpc_xo175_ec_pm_ops,
+	},
+	.probe		= olpc_xo175_ec_probe,
+	.remove		= olpc_xo175_ec_remove,
+};
+module_spi_driver(olpc_xo175_ec_spi_driver);
+
+MODULE_DESCRIPTION("OLPC XO-1.75 Embedded Controller driver");
+MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>"); /* Functionality */
+MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>"); /* Bugs */
+MODULE_LICENSE("GPL");
-- 
2.19.1

[PATCH v2 07/17] Platform: OLPC: Avoid a warning if the EC didn't register yet

[Lubomir Rintel]

Just return ENODEV, so that whoever attempted to use the EC call can
defer their work.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- EPROBE_DEFER instead of ENODEV

 drivers/platform/olpc/olpc-ec.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
index 35a21c66cd0d..9ee993d5d54b 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -116,8 +116,11 @@ int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf, size_t outlen)
 	struct olpc_ec_priv *ec = ec_priv;
 	struct ec_cmd_desc desc;
 
-	/* Ensure a driver and ec hook have been registered */
-	if (WARN_ON(!ec_driver || !ec_driver->ec_cmd))
+	/* Driver not yet registered. */
+	if (!ec_driver)
+		return -EPROBE_DEFER;
+
+	if (WARN_ON(!ec_driver->ec_cmd))
 		return -ENODEV;
 
 	if (!ec)
-- 
2.19.1

[PATCH v2 08/17] Platform: OLPC: Move EC-specific functionality out from x86

[Lubomir Rintel]

Move the olpc-ec driver away from the X86 OLPC platform so that it could be
used by the ARM based laptops too. Notably, the driver for the OLPC battery,
which is also used on the ARM models, builds on this driver's interface.

It is actually plaform independent: the OLPC EC commands with their argument
and responses are mostly the same despite the delivery mechanism is
different.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- Cosmetic changes in line wrapping.
- Remove an old extra copy of EC_SCI_* defines
- Change version to u8
- Explain which parts are platform independent are in the commit message

 arch/x86/include/asm/olpc.h     |  31 ---------
 arch/x86/platform/olpc/olpc.c   | 119 +++++---------------------------
 drivers/platform/olpc/olpc-ec.c |  99 +++++++++++++++++++++++++-
 include/linux/olpc-ec.h         |  32 ++++++++-
 4 files changed, 145 insertions(+), 136 deletions(-)

diff --git a/arch/x86/include/asm/olpc.h b/arch/x86/include/asm/olpc.h
index c2bf1de5d901..6fe76282aceb 100644
--- a/arch/x86/include/asm/olpc.h
+++ b/arch/x86/include/asm/olpc.h
@@ -9,12 +9,10 @@
 struct olpc_platform_t {
 	int flags;
 	uint32_t boardrev;
-	int ecver;
 };
 
 #define OLPC_F_PRESENT		0x01
 #define OLPC_F_DCON		0x02
-#define OLPC_F_EC_WIDE_SCI	0x04
 
 #ifdef CONFIG_OLPC
 
@@ -64,13 +62,6 @@ static inline int olpc_board_at_least(uint32_t rev)
 	return olpc_platform_info.boardrev >= rev;
 }
 
-extern void olpc_ec_wakeup_set(u16 value);
-extern void olpc_ec_wakeup_clear(u16 value);
-extern bool olpc_ec_wakeup_available(void);
-
-extern int olpc_ec_mask_write(u16 bits);
-extern int olpc_ec_sci_query(u16 *sci_value);
-
 #else
 
 static inline int machine_is_olpc(void)
@@ -83,14 +74,6 @@ static inline int olpc_has_dcon(void)
 	return 0;
 }
 
-static inline void olpc_ec_wakeup_set(u16 value) { }
-static inline void olpc_ec_wakeup_clear(u16 value) { }
-
-static inline bool olpc_ec_wakeup_available(void)
-{
-	return false;
-}
-
 #endif
 
 #ifdef CONFIG_OLPC_XO1_PM
@@ -101,20 +84,6 @@ extern void olpc_xo1_pm_wakeup_clear(u16 value);
 
 extern int pci_olpc_init(void);
 
-/* SCI source values */
-
-#define EC_SCI_SRC_EMPTY	0x00
-#define EC_SCI_SRC_GAME		0x01
-#define EC_SCI_SRC_BATTERY	0x02
-#define EC_SCI_SRC_BATSOC	0x04
-#define EC_SCI_SRC_BATERR	0x08
-#define EC_SCI_SRC_EBOOK	0x10	/* XO-1 only */
-#define EC_SCI_SRC_WLAN		0x20	/* XO-1 only */
-#define EC_SCI_SRC_ACPWR	0x40
-#define EC_SCI_SRC_BATCRIT	0x80
-#define EC_SCI_SRC_GPWAKE	0x100	/* XO-1.5 only */
-#define EC_SCI_SRC_ALL		0x1FF
-
 /* GPIO assignments */
 
 #define OLPC_GPIO_MIC_AC	1
diff --git a/arch/x86/platform/olpc/olpc.c b/arch/x86/platform/olpc/olpc.c
index f0e920fb98ad..c6c62b4f251f 100644
--- a/arch/x86/platform/olpc/olpc.c
+++ b/arch/x86/platform/olpc/olpc.c
@@ -30,9 +30,6 @@
 struct olpc_platform_t olpc_platform_info;
 EXPORT_SYMBOL_GPL(olpc_platform_info);
 
-/* EC event mask to be applied during suspend (defining wakeup sources). */
-static u16 ec_wakeup_mask;
-
 /* what the timeout *should* be (in ms) */
 #define EC_BASE_TIMEOUT 20
 
@@ -186,83 +183,6 @@ static int olpc_xo1_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf,
 	return ret;
 }
 
-void olpc_ec_wakeup_set(u16 value)
-{
-	ec_wakeup_mask |= value;
-}
-EXPORT_SYMBOL_GPL(olpc_ec_wakeup_set);
-
-void olpc_ec_wakeup_clear(u16 value)
-{
-	ec_wakeup_mask &= ~value;
-}
-EXPORT_SYMBOL_GPL(olpc_ec_wakeup_clear);
-
-/*
- * Returns true if the compile and runtime configurations allow for EC events
- * to wake the system.
- */
-bool olpc_ec_wakeup_available(void)
-{
-	if (!machine_is_olpc())
-		return false;
-
-	/*
-	 * XO-1 EC wakeups are available when olpc-xo1-sci driver is
-	 * compiled in
-	 */
-#ifdef CONFIG_OLPC_XO1_SCI
-	if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) /* XO-1 */
-		return true;
-#endif
-
-	/*
-	 * XO-1.5 EC wakeups are available when olpc-xo15-sci driver is
-	 * compiled in
-	 */
-#ifdef CONFIG_OLPC_XO15_SCI
-	if (olpc_platform_info.boardrev >= olpc_board_pre(0xd0)) /* XO-1.5 */
-		return true;
-#endif
-
-	return false;
-}
-EXPORT_SYMBOL_GPL(olpc_ec_wakeup_available);
-
-int olpc_ec_mask_write(u16 bits)
-{
-	if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) {
-		__be16 ec_word = cpu_to_be16(bits);
-		return olpc_ec_cmd(EC_WRITE_EXT_SCI_MASK, (void *) &ec_word, 2,
-				   NULL, 0);
-	} else {
-		unsigned char ec_byte = bits & 0xff;
-		return olpc_ec_cmd(EC_WRITE_SCI_MASK, &ec_byte, 1, NULL, 0);
-	}
-}
-EXPORT_SYMBOL_GPL(olpc_ec_mask_write);
-
-int olpc_ec_sci_query(u16 *sci_value)
-{
-	int ret;
-
-	if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) {
-		__be16 ec_word;
-		ret = olpc_ec_cmd(EC_EXT_SCI_QUERY,
-			NULL, 0, (void *) &ec_word, 2);
-		if (ret == 0)
-			*sci_value = be16_to_cpu(ec_word);
-	} else {
-		unsigned char ec_byte;
-		ret = olpc_ec_cmd(EC_SCI_QUERY, NULL, 0, &ec_byte, 1);
-		if (ret == 0)
-			*sci_value = ec_byte;
-	}
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(olpc_ec_sci_query);
-
 static bool __init check_ofw_architecture(struct device_node *root)
 {
 	const char *olpc_arch;
@@ -296,6 +216,10 @@ static bool __init platform_detect(void)
 	if (success) {
 		olpc_platform_info.boardrev = get_board_revision(root);
 		olpc_platform_info.flags |= OLPC_F_PRESENT;
+
+		pr_info("OLPC board revision %s%X\n",
+			((olpc_platform_info.boardrev & 0xf) < 8) ? "pre" : "",
+			olpc_platform_info.boardrev >> 4);
 	}
 
 	of_node_put(root);
@@ -315,27 +239,8 @@ static int __init add_xo1_platform_devices(void)
 	return PTR_ERR_OR_ZERO(pdev);
 }
 
-static int olpc_xo1_ec_probe(struct platform_device *pdev)
-{
-	/* get the EC revision */
-	olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0,
-			(unsigned char *) &olpc_platform_info.ecver, 1);
-
-	/* EC version 0x5f adds support for wide SCI mask */
-	if (olpc_platform_info.ecver >= 0x5f)
-		olpc_platform_info.flags |= OLPC_F_EC_WIDE_SCI;
-
-	pr_info("OLPC board revision %s%X (EC=%x)\n",
-			((olpc_platform_info.boardrev & 0xf) < 8) ? "pre" : "",
-			olpc_platform_info.boardrev >> 4,
-			olpc_platform_info.ecver);
-
-	return 0;
-}
 static int olpc_xo1_ec_suspend(struct platform_device *pdev)
 {
-	olpc_ec_mask_write(ec_wakeup_mask);
-
 	/*
 	 * Squelch SCIs while suspended.  This is a fix for
 	 * <http://dev.laptop.org/ticket/1835>.
@@ -359,15 +264,27 @@ static int olpc_xo1_ec_resume(struct platform_device *pdev)
 }
 
 static struct olpc_ec_driver ec_xo1_driver = {
-	.probe = olpc_xo1_ec_probe,
 	.suspend = olpc_xo1_ec_suspend,
 	.resume = olpc_xo1_ec_resume,
 	.ec_cmd = olpc_xo1_ec_cmd,
+#ifdef CONFIG_OLPC_XO1_SCI
+	/*
+	 * XO-1 EC wakeups are available when olpc-xo1-sci driver is
+	 * compiled in
+	 */
+	.wakeup_available = true,
+#endif
 };
 
 static struct olpc_ec_driver ec_xo1_5_driver = {
-	.probe = olpc_xo1_ec_probe,
 	.ec_cmd = olpc_xo1_ec_cmd,
+#ifdef CONFIG_OLPC_XO1_5_SCI
+	/*
+	 * XO-1.5 EC wakeups are available when olpc-xo15-sci driver is
+	 * compiled in
+	 */
+	.wakeup_available = true,
+#endif
 };
 
 static int __init olpc_init(void)
diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
index 9ee993d5d54b..2b80174b8f4b 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -30,6 +30,7 @@ struct ec_cmd_desc {
 
 struct olpc_ec_priv {
 	struct olpc_ec_driver *drv;
+	u8 version;
 	struct work_struct worker;
 	struct mutex cmd_lock;
 
@@ -39,6 +40,12 @@ struct olpc_ec_priv {
 
 	struct dentry *dbgfs_dir;
 
+	/*
+	 * EC event mask to be applied during suspend (defining wakeup
+	 * sources).
+	 */
+	u16 ec_wakeup_mask;
+
 	/*
 	 * Running an EC command while suspending means we don't always finish
 	 * the command before the machine suspends.  This means that the EC
@@ -150,6 +157,88 @@ int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf, size_t outlen)
 }
 EXPORT_SYMBOL_GPL(olpc_ec_cmd);
 
+void olpc_ec_wakeup_set(u16 value)
+{
+	struct olpc_ec_priv *ec = ec_priv;
+
+	if (WARN_ON(!ec))
+		return;
+
+	ec->ec_wakeup_mask |= value;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_set);
+
+void olpc_ec_wakeup_clear(u16 value)
+{
+	struct olpc_ec_priv *ec = ec_priv;
+
+	if (WARN_ON(!ec))
+		return;
+
+	ec->ec_wakeup_mask &= ~value;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_clear);
+
+int olpc_ec_mask_write(u16 bits)
+{
+	struct olpc_ec_priv *ec = ec_priv;
+
+	if (WARN_ON(!ec))
+		return -ENODEV;
+
+	/* EC version 0x5f adds support for wide SCI mask */
+	if (ec->version >= 0x5f) {
+		__be16 ec_word = cpu_to_be16(bits);
+
+		return olpc_ec_cmd(EC_WRITE_EXT_SCI_MASK, (void *) &ec_word, 2, NULL, 0);
+	} else {
+		unsigned char ec_byte = bits & 0xff;
+
+		return olpc_ec_cmd(EC_WRITE_SCI_MASK, &ec_byte, 1, NULL, 0);
+	}
+}
+EXPORT_SYMBOL_GPL(olpc_ec_mask_write);
+
+/*
+ * Returns true if the compile and runtime configurations allow for EC events
+ * to wake the system.
+ */
+bool olpc_ec_wakeup_available(void)
+{
+	if (WARN_ON(!ec_driver))
+		return false;
+
+	return ec_driver->wakeup_available;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_available);
+
+int olpc_ec_sci_query(u16 *sci_value)
+{
+	struct olpc_ec_priv *ec = ec_priv;
+	int ret;
+
+	if (WARN_ON(!ec))
+		return -ENODEV;
+
+	/* EC version 0x5f adds support for wide SCI mask */
+	if (ec->version >= 0x5f) {
+		__be16 ec_word;
+
+		ret = olpc_ec_cmd(EC_EXT_SCI_QUERY, NULL, 0, (void *)&ec_word, 2);
+		if (ret == 0)
+			*sci_value = be16_to_cpu(ec_word);
+	} else {
+		unsigned char ec_byte;
+
+		ret = olpc_ec_cmd(EC_SCI_QUERY, NULL, 0, &ec_byte, 1);
+		if (ret == 0)
+			*sci_value = ec_byte;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_sci_query);
+
 #ifdef CONFIG_DEBUG_FS
 
 /*
@@ -277,14 +366,16 @@ static int olpc_ec_probe(struct platform_device *pdev)
 	ec_priv = ec;
 	platform_set_drvdata(pdev, ec);
 
-	err = ec_driver->probe ? ec_driver->probe(pdev) : 0;
+	/* get the EC revision */
+	err = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, &ec->version, 1);
 	if (err) {
 		ec_priv = NULL;
 		kfree(ec);
-	} else {
-		ec->dbgfs_dir = olpc_ec_setup_debugfs();
+		return err;
 	}
 
+	ec->dbgfs_dir = olpc_ec_setup_debugfs();
+
 	return err;
 }
 
@@ -294,6 +385,8 @@ static int olpc_ec_suspend(struct device *dev)
 	struct olpc_ec_priv *ec = platform_get_drvdata(pdev);
 	int err = 0;
 
+	olpc_ec_mask_write(ec->ec_wakeup_mask);
+
 	if (ec_driver->suspend)
 		err = ec_driver->suspend(pdev);
 	if (!err)
diff --git a/include/linux/olpc-ec.h b/include/linux/olpc-ec.h
index 79bdc6328c52..7fa3d27f7fee 100644
--- a/include/linux/olpc-ec.h
+++ b/include/linux/olpc-ec.h
@@ -16,14 +16,28 @@
 #define EC_SCI_QUERY			0x84
 #define EC_EXT_SCI_QUERY		0x85
 
+/* SCI source values */
+#define EC_SCI_SRC_EMPTY        0x00
+#define EC_SCI_SRC_GAME         0x01
+#define EC_SCI_SRC_BATTERY      0x02
+#define EC_SCI_SRC_BATSOC       0x04
+#define EC_SCI_SRC_BATERR       0x08
+#define EC_SCI_SRC_EBOOK        0x10    /* XO-1 only */
+#define EC_SCI_SRC_WLAN         0x20    /* XO-1 only */
+#define EC_SCI_SRC_ACPWR        0x40
+#define EC_SCI_SRC_BATCRIT      0x80
+#define EC_SCI_SRC_GPWAKE       0x100   /* XO-1.5 only */
+#define EC_SCI_SRC_ALL          0x1FF
+
 struct platform_device;
 
 struct olpc_ec_driver {
-	int (*probe)(struct platform_device *);
 	int (*suspend)(struct platform_device *);
 	int (*resume)(struct platform_device *);
 
 	int (*ec_cmd)(u8, u8 *, size_t, u8 *, size_t, void *);
+
+	bool wakeup_available;
 };
 
 #ifdef CONFIG_OLPC
@@ -33,11 +47,27 @@ extern void olpc_ec_driver_register(struct olpc_ec_driver *drv, void *arg);
 extern int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf,
 		size_t outlen);
 
+extern void olpc_ec_wakeup_set(u16 value);
+extern void olpc_ec_wakeup_clear(u16 value);
+
+extern int olpc_ec_mask_write(u16 bits);
+extern int olpc_ec_sci_query(u16 *sci_value);
+
+extern bool olpc_ec_wakeup_available(void);
+
 #else
 
 static inline int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf,
 		size_t outlen) { return -ENODEV; }
 
+static inline void olpc_ec_wakeup_set(u16 value) { }
+static inline void olpc_ec_wakeup_clear(u16 value) { }
+
+static inline bool olpc_ec_wakeup_available(void)
+{
+	return false;
+}
+
 #endif /* CONFIG_OLPC */
 
 #endif /* _LINUX_OLPC_EC_H */
-- 
2.19.1

[PATCH v2 09/17] Platform: OLPC: Use BIT() and GENMASK() for event masks

[Lubomir Rintel]

Just a cosmetic tidy-up.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

---
Changes since v1:
- This patch was added to the set.

 include/linux/olpc-ec.h | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/include/linux/olpc-ec.h b/include/linux/olpc-ec.h
index 7fa3d27f7fee..f7b6a7eda232 100644
--- a/include/linux/olpc-ec.h
+++ b/include/linux/olpc-ec.h
@@ -2,6 +2,8 @@
 #ifndef _LINUX_OLPC_EC_H
 #define _LINUX_OLPC_EC_H
 
+#include <linux/bits.h>
+
 /* XO-1 EC commands */
 #define EC_FIRMWARE_REV			0x08
 #define EC_WRITE_SCI_MASK		0x1b
@@ -17,17 +19,16 @@
 #define EC_EXT_SCI_QUERY		0x85
 
 /* SCI source values */
-#define EC_SCI_SRC_EMPTY        0x00
-#define EC_SCI_SRC_GAME         0x01
-#define EC_SCI_SRC_BATTERY      0x02
-#define EC_SCI_SRC_BATSOC       0x04
-#define EC_SCI_SRC_BATERR       0x08
-#define EC_SCI_SRC_EBOOK        0x10    /* XO-1 only */
-#define EC_SCI_SRC_WLAN         0x20    /* XO-1 only */
-#define EC_SCI_SRC_ACPWR        0x40
-#define EC_SCI_SRC_BATCRIT      0x80
-#define EC_SCI_SRC_GPWAKE       0x100   /* XO-1.5 only */
-#define EC_SCI_SRC_ALL          0x1FF
+#define EC_SCI_SRC_GAME         BIT(0)
+#define EC_SCI_SRC_BATTERY      BIT(1)
+#define EC_SCI_SRC_BATSOC       BIT(2)
+#define EC_SCI_SRC_BATERR       BIT(3)
+#define EC_SCI_SRC_EBOOK        BIT(4)    /* XO-1 only */
+#define EC_SCI_SRC_WLAN         BIT(5)    /* XO-1 only */
+#define EC_SCI_SRC_ACPWR        BIT(6)
+#define EC_SCI_SRC_BATCRIT      BIT(7)
+#define EC_SCI_SRC_GPWAKE       BIT(8)   /* XO-1.5 only */
+#define EC_SCI_SRC_ALL          GENMASK(8, 0)
 
 struct platform_device;
 
-- 
2.19.1

[PATCH v2 10/17] Platform: OLPC: add a regulator for the DCON

[Lubomir Rintel]

All OLPC ECs are able to turn the power to the DCON on an off. Use the
regulator framework to expose the functionality.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

---
Changes since v1:
- Use idiomatic form of return on error
- Avoid mixing bool and int

 drivers/platform/olpc/Kconfig   |  1 +
 drivers/platform/olpc/olpc-ec.c | 67 +++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)

diff --git a/drivers/platform/olpc/Kconfig b/drivers/platform/olpc/Kconfig
index 7c643d24ad0f..c5a872fb286f 100644
--- a/drivers/platform/olpc/Kconfig
+++ b/drivers/platform/olpc/Kconfig
@@ -6,6 +6,7 @@ config OLPC
 	select OF
 	select OF_PROMTREE if X86
 	select IRQ_DOMAIN
+	select REGULATOR
 	help
 	  Add support for detecting the unique features of the OLPC
 	  XO hardware.
diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
index 2b80174b8f4b..f725ab2a2db9 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -14,6 +14,7 @@
 #include <linux/workqueue.h>
 #include <linux/module.h>
 #include <linux/list.h>
+#include <linux/regulator/driver.h>
 #include <linux/olpc-ec.h>
 
 struct ec_cmd_desc {
@@ -34,6 +35,10 @@ struct olpc_ec_priv {
 	struct work_struct worker;
 	struct mutex cmd_lock;
 
+	/* DCON regulator */
+	struct regulator_dev *dcon_rdev;
+	bool dcon_enabled;
+
 	/* Pending EC commands */
 	struct list_head cmd_q;
 	spinlock_t cmd_q_lock;
@@ -344,9 +349,61 @@ static struct dentry *olpc_ec_setup_debugfs(void)
 
 #endif /* CONFIG_DEBUG_FS */
 
+static int olpc_ec_set_dcon_power(struct olpc_ec_priv *ec, bool state)
+{
+	unsigned char ec_byte = state;
+	int ret;
+
+	if (ec->dcon_enabled == state)
+		return 0;
+
+	ret = olpc_ec_cmd(EC_DCON_POWER_MODE, &ec_byte, 1, NULL, 0);
+	if (ret)
+		return ret;
+
+	ec->dcon_enabled = state;
+	return 0;
+}
+
+static int dcon_regulator_enable(struct regulator_dev *rdev)
+{
+	struct olpc_ec_priv *ec = rdev_get_drvdata(rdev);
+
+	return olpc_ec_set_dcon_power(ec, true);
+}
+
+static int dcon_regulator_disable(struct regulator_dev *rdev)
+{
+	struct olpc_ec_priv *ec = rdev_get_drvdata(rdev);
+
+	return olpc_ec_set_dcon_power(ec, false);
+}
+
+static int dcon_regulator_is_enabled(struct regulator_dev *rdev)
+{
+	struct olpc_ec_priv *ec = rdev_get_drvdata(rdev);
+
+	return ec->dcon_enabled ? 1 : 0;
+}
+
+static struct regulator_ops dcon_regulator_ops = {
+	.enable		= dcon_regulator_enable,
+	.disable	= dcon_regulator_disable,
+	.is_enabled	= dcon_regulator_is_enabled,
+};
+
+static const struct regulator_desc dcon_desc = {
+	.name	= "dcon",
+	.id	= 0,
+	.ops	= &dcon_regulator_ops,
+	.type	= REGULATOR_VOLTAGE,
+	.owner	= THIS_MODULE,
+};
+
 static int olpc_ec_probe(struct platform_device *pdev)
 {
 	struct olpc_ec_priv *ec;
+	struct regulator_config config = { };
 	int err;
 
 	if (!ec_driver)
@@ -374,6 +431,16 @@ static int olpc_ec_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	config.dev = pdev->dev.parent;
+	config.driver_data = ec;
+	ec->dcon_enabled = true;
+	ec->dcon_rdev = devm_regulator_register(&pdev->dev, &dcon_desc,
+								&config);
+	if (IS_ERR(ec->dcon_rdev)) {
+		dev_err(&pdev->dev, "failed to register DCON regulator\n");
+		return PTR_ERR(ec->dcon_rdev);
+	}
+
 	ec->dbgfs_dir = olpc_ec_setup_debugfs();
 
 	return err;
-- 
2.19.1

[PATCH v2 11/17] dt-bindings: olpc_battery: Add XO-1.5 battery

[Lubomir Rintel]

The XO-1 and XO-1.5 batteries apparently differ in an ability to report
ambient temperature.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- Collected Reviewed-by and Acked-by tags

 Documentation/devicetree/bindings/power/supply/olpc_battery.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/power/supply/olpc_battery.txt b/Documentation/devicetree/bindings/power/supply/olpc_battery.txt
index c8901b3992d9..8d87d6b35a98 100644
--- a/Documentation/devicetree/bindings/power/supply/olpc_battery.txt
+++ b/Documentation/devicetree/bindings/power/supply/olpc_battery.txt
@@ -2,4 +2,4 @@ OLPC battery
 ~~~~~~~~~~~~
 
 Required properties:
-  - compatible : "olpc,xo1-battery"
+  - compatible : "olpc,xo1-battery" or "olpc,xo1.5-battery"
-- 
2.19.1

[PATCH v2 12/17] x86, olpc: Use a correct version when making up a battery node

[Lubomir Rintel]

The XO-1 and XO-1.5 batteries apparently differ in an ability to report
ambient temperature. Add a different compatible string to the 1.5
battery.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- Avoid splitting string literals

 arch/x86/platform/olpc/olpc_dt.c | 85 +++++++++++++++++++++-----------
 1 file changed, 57 insertions(+), 28 deletions(-)

diff --git a/arch/x86/platform/olpc/olpc_dt.c b/arch/x86/platform/olpc/olpc_dt.c
index 24d2175a9480..6063f52ed807 100644
--- a/arch/x86/platform/olpc/olpc_dt.c
+++ b/arch/x86/platform/olpc/olpc_dt.c
@@ -218,10 +218,28 @@ static u32 __init olpc_dt_get_board_revision(void)
 	return be32_to_cpu(rev);
 }
 
-void __init olpc_dt_fixup(void)
+int olpc_dt_compatible_match(phandle node, const char *compat)
 {
-	int r;
 	char buf[64];
+	int plen;
+	char *p;
+	int len;
+
+	plen = olpc_dt_getproperty(node, "compatible", buf, sizeof(buf));
+	if (plen <= 0)
+		return 0;
+
+	len = strlen(compat);
+	for (p = buf; p < buf + plen; p += strlen(p) + 1) {
+		if (strcmp(p, compat) == 0)
+			return 1;
+	}
+
+	return 0;
+}
+
+void __init olpc_dt_fixup(void)
+{
 	phandle node;
 	u32 board_rev;
 
@@ -229,41 +247,51 @@ void __init olpc_dt_fixup(void)
 	if (!node)
 		return;
 
-	/*
-	 * If the battery node has a compatible property, we are running a new
-	 * enough firmware and don't have fixups to make.
-	 */
-	r = olpc_dt_getproperty(node, "compatible", buf, sizeof(buf));
-	if (r > 0)
-		return;
-
-	pr_info("PROM DT: Old firmware detected, applying fixes\n");
-
-	/* Add olpc,xo1-battery compatible marker to battery node */
-	olpc_dt_interpret("\" /battery@0\" find-device"
-		" \" olpc,xo1-battery\" +compatible"
-		" device-end");
-
 	board_rev = olpc_dt_get_board_revision();
 	if (!board_rev)
 		return;
 
 	if (board_rev >= olpc_board_pre(0xd0)) {
+		if (olpc_dt_compatible_match(node, "olpc,xo1.5-battery"))
+			return;
+
+		/* Add olpc,xo1.5-battery compatible marker to battery node */
+		olpc_dt_interpret("\" /battery@0\" find-device");
+		olpc_dt_interpret("  \" olpc,xo1.5-battery\" +compatible");
+		olpc_dt_interpret("device-end");
+
+		/* We're running a very old firmware if this is missing. */
+		if (olpc_dt_compatible_match(node, "olpc,xo1-battery"))
+			return;
+
 		/* XO-1.5: add dcon device */
-		olpc_dt_interpret("\" /pci/display@1\" find-device"
-			" new-device"
-			" \" dcon\" device-name \" olpc,xo1-dcon\" +compatible"
-			" finish-device device-end");
+		olpc_dt_interpret("\" /pci/display@1\" find-device");
+		olpc_dt_interpret("  new-device");
+		olpc_dt_interpret("    \" dcon\" device-name");
+		olpc_dt_interpret("    \" olpc,xo1-dcon\" +compatible");
+		olpc_dt_interpret("  finish-device");
+		olpc_dt_interpret("device-end");
 	} else {
+		/* We're running a very old firmware if this is missing. */
+		if (olpc_dt_compatible_match(node, "olpc,xo1-battery"))
+			return;
+
 		/* XO-1: add dcon device, mark RTC as olpc,xo1-rtc */
-		olpc_dt_interpret("\" /pci/display@1,1\" find-device"
-			" new-device"
-			" \" dcon\" device-name \" olpc,xo1-dcon\" +compatible"
-			" finish-device device-end"
-			" \" /rtc\" find-device"
-			" \" olpc,xo1-rtc\" +compatible"
-			" device-end");
+		olpc_dt_interpret("\" /pci/display@1,1\" find-device");
+		olpc_dt_interpret("  new-device");
+		olpc_dt_interpret("    \" dcon\" device-name");
+		olpc_dt_interpret("    \" olpc,xo1-dcon\" +compatible");
+		olpc_dt_interpret("  finish-device");
+		olpc_dt_interpret("device-end");
+		olpc_dt_interpret("\" /rtc\" find-device");
+		olpc_dt_interpret("  \" olpc,xo1-rtc\" +compatible");
+		olpc_dt_interpret("device-end");
 	}
+
+	/* Add olpc,xo1-battery compatible marker to battery node */
+	olpc_dt_interpret("\" /battery@0\" find-device");
+	olpc_dt_interpret("  \" olpc,xo1-battery\" +compatible");
+	olpc_dt_interpret("device-end");
 }
 
 void __init olpc_dt_build_devicetree(void)
@@ -289,6 +317,7 @@ void __init olpc_dt_build_devicetree(void)
 /* A list of DT node/bus matches that we want to expose as platform devices */
 static struct of_device_id __initdata of_ids[] = {
 	{ .compatible = "olpc,xo1-battery" },
+	{ .compatible = "olpc,xo1.5-battery" },
 	{ .compatible = "olpc,xo1-dcon" },
 	{ .compatible = "olpc,xo1-rtc" },
 	{},
-- 
2.19.1

[PATCH v2 13/17] power: supply: olpc_battery: Use DT to get battery version

[Lubomir Rintel]

Avoid using the x86 OLPC platform specific call to get the board
version. It won't work on FDT-based ARM MMP2 platform.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- Sort the new include a bit higher

 drivers/power/supply/olpc_battery.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
index 5a97e42a3547..5323987d9284 100644
--- a/drivers/power/supply/olpc_battery.c
+++ b/drivers/power/supply/olpc_battery.c
@@ -14,6 +14,7 @@
 #include <linux/types.h>
 #include <linux/err.h>
 #include <linux/device.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/jiffies.h>
@@ -622,11 +623,13 @@ static int olpc_battery_probe(struct platform_device *pdev)
 	olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, NULL);
 	if (IS_ERR(olpc_ac))
 		return PTR_ERR(olpc_ac);
-
-	if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */
+	if (of_property_match_string(pdev->dev.of_node, "compatible",
+					"olpc,xo1.5-battery") >= 0) {
+		/* XO-1.5 */
 		olpc_bat_desc.properties = olpc_xo15_bat_props;
 		olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
-	} else { /* XO-1 */
+	} else {
+		/* XO-1 */
 		olpc_bat_desc.properties = olpc_xo1_bat_props;
 		olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
 	}
@@ -672,6 +675,7 @@ static int olpc_battery_remove(struct platform_device *pdev)
 
 static const struct of_device_id olpc_battery_ids[] = {
 	{ .compatible = "olpc,xo1-battery" },
+	{ .compatible = "olpc,xo1.5-battery" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, olpc_battery_ids);
-- 
2.19.1

[PATCH v2 14/17] power: supply: olpc_battery: Move priv data to a struct

[Lubomir Rintel]

The global variables for private data are not too nice. I'd like some
more, and that would clutter the global name space even further.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

---
Changes since v1:
- Split out the move to devm_* into a separate patch

 drivers/power/supply/olpc_battery.c | 68 +++++++++++++++++------------
 1 file changed, 40 insertions(+), 28 deletions(-)

diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
index 5323987d9284..b091f897c1d4 100644
--- a/drivers/power/supply/olpc_battery.c
+++ b/drivers/power/supply/olpc_battery.c
@@ -53,6 +53,12 @@
 
 #define BAT_ADDR_MFR_TYPE	0x5F
 
+struct olpc_battery_data {
+	struct power_supply *olpc_ac;
+	struct power_supply *olpc_bat;
+	char bat_serial[17];
+};
+
 /*********************************************************************
  *		Power
  *********************************************************************/
@@ -91,11 +97,8 @@ static const struct power_supply_desc olpc_ac_desc = {
 	.get_property = olpc_ac_get_prop,
 };
 
-static struct power_supply *olpc_ac;
-
-static char bat_serial[17]; /* Ick */
-
-static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
+static int olpc_bat_get_status(struct olpc_battery_data *data,
+		union power_supply_propval *val, uint8_t ec_byte)
 {
 	if (olpc_platform_info.ecver > 0x44) {
 		if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
@@ -326,6 +329,7 @@ static int olpc_bat_get_property(struct power_supply *psy,
 				 enum power_supply_property psp,
 				 union power_supply_propval *val)
 {
+	struct olpc_battery_data *data = power_supply_get_drvdata(psy);
 	int ret = 0;
 	__be16 ec_word;
 	uint8_t ec_byte;
@@ -347,7 +351,7 @@ static int olpc_bat_get_property(struct power_supply *psy,
 
 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
-		ret = olpc_bat_get_status(val, ec_byte);
+		ret = olpc_bat_get_status(data, val, ec_byte);
 		if (ret)
 			return ret;
 		break;
@@ -450,8 +454,8 @@ static int olpc_bat_get_property(struct power_supply *psy,
 		if (ret)
 			return ret;
 
-		sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
-		val->strval = bat_serial;
+		sprintf(data->bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
+		val->strval = data->bat_serial;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 		ret = olpc_bat_get_voltage_max_design(val);
@@ -579,17 +583,17 @@ static struct power_supply_desc olpc_bat_desc = {
 	.use_for_apm = 1,
 };
 
-static struct power_supply *olpc_bat;
-
 static int olpc_battery_suspend(struct platform_device *pdev,
 				pm_message_t state)
 {
-	if (device_may_wakeup(&olpc_ac->dev))
+	struct olpc_battery_data *data = platform_get_drvdata(pdev);
+
+	if (device_may_wakeup(&data->olpc_ac->dev))
 		olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR);
 	else
 		olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR);
 
-	if (device_may_wakeup(&olpc_bat->dev))
+	if (device_may_wakeup(&data->olpc_bat->dev))
 		olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
 				   | EC_SCI_SRC_BATERR);
 	else
@@ -601,7 +605,8 @@ static int olpc_battery_suspend(struct platform_device *pdev,
 
 static int olpc_battery_probe(struct platform_device *pdev)
 {
-	int ret;
+	struct power_supply_config psy_cfg = {};
+	struct olpc_battery_data *data;
 	uint8_t status;
 
 	/*
@@ -620,9 +625,13 @@ static int olpc_battery_probe(struct platform_device *pdev)
 
 	/* Ignore the status. It doesn't actually matter */
 
-	olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, NULL);
-	if (IS_ERR(olpc_ac))
-		return PTR_ERR(olpc_ac);
+	psy_cfg.of_node = pdev->dev.of_node;
+	psy_cfg.drv_data = data;
+
+	data->olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, &psy_cfg);
+	if (IS_ERR(data->olpc_ac))
+		return PTR_ERR(data->olpc_ac);
+
 	if (of_property_match_string(pdev->dev.of_node, "compatible",
 					"olpc,xo1.5-battery") >= 0) {
 		/* XO-1.5 */
@@ -634,42 +643,45 @@ static int olpc_battery_probe(struct platform_device *pdev)
 		olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
 	}
 
-	olpc_bat = power_supply_register(&pdev->dev, &olpc_bat_desc, NULL);
+	data->olpc_bat = power_supply_register(&pdev->dev, &olpc_bat_desc, &psy_cfg);
 	if (IS_ERR(olpc_bat)) {
 		ret = PTR_ERR(olpc_bat);
 		goto battery_failed;
 	}
 
-	ret = device_create_bin_file(&olpc_bat->dev, &olpc_bat_eeprom);
+	ret = device_create_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
 	if (ret)
 		goto eeprom_failed;
 
-	ret = device_create_file(&olpc_bat->dev, &olpc_bat_error);
+	ret = device_create_file(&data->olpc_bat->dev, &olpc_bat_error);
 	if (ret)
 		goto error_failed;
 
 	if (olpc_ec_wakeup_available()) {
-		device_set_wakeup_capable(&olpc_ac->dev, true);
-		device_set_wakeup_capable(&olpc_bat->dev, true);
+		device_set_wakeup_capable(&data->olpc_ac->dev, true);
+		device_set_wakeup_capable(&data->olpc_bat->dev, true);
 	}
 
 	return 0;
 
 error_failed:
-	device_remove_bin_file(&olpc_bat->dev, &olpc_bat_eeprom);
+	device_remove_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
 eeprom_failed:
-	power_supply_unregister(olpc_bat);
+	power_supply_unregister(data->olpc_bat);
 battery_failed:
-	power_supply_unregister(olpc_ac);
+	power_supply_unregister(data->olpc_ac);
 	return ret;
 }
 
 static int olpc_battery_remove(struct platform_device *pdev)
 {
-	device_remove_file(&olpc_bat->dev, &olpc_bat_error);
-	device_remove_bin_file(&olpc_bat->dev, &olpc_bat_eeprom);
-	power_supply_unregister(olpc_bat);
-	power_supply_unregister(olpc_ac);
+	struct olpc_battery_data *data = platform_get_drvdata(pdev);
+
+	device_remove_file(&data->olpc_bat->dev, &olpc_bat_error);
+	device_remove_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
+	power_supply_unregister(data->olpc_bat);
+	power_supply_unregister(data->olpc_ac);
+
 	return 0;
 }
 
-- 
2.19.1

[PATCH v2 15/17] power: supply: olpc_battery: Use devm_power_supply_register()

[Lubomir Rintel]

This simplifies the error handling.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

---
Changes since v1:
- This was split off the "power: supply: olpc_battery: Move priv data to
  a struct" patch.

 drivers/power/supply/olpc_battery.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
index b091f897c1d4..4433eb10a23d 100644
--- a/drivers/power/supply/olpc_battery.c
+++ b/drivers/power/supply/olpc_battery.c
@@ -628,7 +628,7 @@ static int olpc_battery_probe(struct platform_device *pdev)
 	psy_cfg.of_node = pdev->dev.of_node;
 	psy_cfg.drv_data = data;
 
-	data->olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, &psy_cfg);
+	data->olpc_ac = devm_power_supply_register(&pdev->dev, &olpc_ac_desc, &psy_cfg);
 	if (IS_ERR(data->olpc_ac))
 		return PTR_ERR(data->olpc_ac);
 
@@ -643,15 +643,13 @@ static int olpc_battery_probe(struct platform_device *pdev)
 		olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
 	}
 
-	data->olpc_bat = power_supply_register(&pdev->dev, &olpc_bat_desc, &psy_cfg);
-	if (IS_ERR(olpc_bat)) {
-		ret = PTR_ERR(olpc_bat);
-		goto battery_failed;
-	}
+	data->olpc_bat = devm_power_supply_register(&pdev->dev, &olpc_bat_desc, &psy_cfg);
+	if (IS_ERR(data->olpc_bat))
+		return PTR_ERR(data->olpc_bat);
 
 	ret = device_create_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
 	if (ret)
-		goto eeprom_failed;
+		return ret;
 
 	ret = device_create_file(&data->olpc_bat->dev, &olpc_bat_error);
 	if (ret)
@@ -666,10 +664,6 @@ static int olpc_battery_probe(struct platform_device *pdev)
 
 error_failed:
 	device_remove_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
-eeprom_failed:
-	power_supply_unregister(data->olpc_bat);
-battery_failed:
-	power_supply_unregister(data->olpc_ac);
 	return ret;
 }
 
@@ -679,9 +673,6 @@ static int olpc_battery_remove(struct platform_device *pdev)
 
 	device_remove_file(&data->olpc_bat->dev, &olpc_bat_error);
 	device_remove_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
-	power_supply_unregister(data->olpc_bat);
-	power_supply_unregister(data->olpc_ac);
-
 	return 0;
 }
 
-- 
2.19.1

[PATCH v2 16/17] power: supply: olpc_battery: Avoid using platform_info

[Lubomir Rintel]

This wouldn't work on the DT-based ARM platform. Let's read the EC version
directly from the EC driver instead.

This makes the driver no longer x86 specific.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- Use uint8_t instead of unsigned char [1] for ecver

 drivers/power/supply/Kconfig        |  2 +-
 drivers/power/supply/olpc_battery.c | 35 +++++++++++++++++++++--------
 2 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index f27cf0709500..dd7ae1431098 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -151,7 +151,7 @@ config BATTERY_PMU
 
 config BATTERY_OLPC
 	tristate "One Laptop Per Child battery"
-	depends on X86_32 && OLPC
+	depends on OLPC
 	help
 	  Say Y to enable support for the battery on the OLPC laptop.
 
diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
index 4433eb10a23d..ec5dfb8fcb8a 100644
--- a/drivers/power/supply/olpc_battery.c
+++ b/drivers/power/supply/olpc_battery.c
@@ -20,8 +20,6 @@
 #include <linux/jiffies.h>
 #include <linux/sched.h>
 #include <linux/olpc-ec.h>
-#include <asm/olpc.h>
-
 
 #define EC_BAT_VOLTAGE	0x10	/* uint16_t,	*9.76/32,    mV   */
 #define EC_BAT_CURRENT	0x11	/* int16_t,	*15.625/120, mA   */
@@ -57,6 +55,7 @@ struct olpc_battery_data {
 	struct power_supply *olpc_ac;
 	struct power_supply *olpc_bat;
 	char bat_serial[17];
+	int new_proto;
 };
 
 /*********************************************************************
@@ -100,7 +99,7 @@ static const struct power_supply_desc olpc_ac_desc = {
 static int olpc_bat_get_status(struct olpc_battery_data *data,
 		union power_supply_propval *val, uint8_t ec_byte)
 {
-	if (olpc_platform_info.ecver > 0x44) {
+	if (data->new_proto) {
 		if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		else if (ec_byte & BAT_STAT_DISCHARGING)
@@ -608,14 +607,32 @@ static int olpc_battery_probe(struct platform_device *pdev)
 	struct power_supply_config psy_cfg = {};
 	struct olpc_battery_data *data;
 	uint8_t status;
+	uint8_t ecver;
+	int ret;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, data);
+
+	/* See if the EC is already there and get the EC revision */
+	ret = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, &ecver, 1);
+	if (ret) {
+		if (ret == -ENODEV)
+			return -EPROBE_DEFER;
+		return ret;
+	}
 
-	/*
-	 * We've seen a number of EC protocol changes; this driver requires
-	 * the latest EC protocol, supported by 0x44 and above.
-	 */
-	if (olpc_platform_info.ecver < 0x44) {
+	if (ecver > 0x44) {
+		/* XO 1 or 1.5 with a new EC firmware. */
+		data->new_proto = 1;
+	} else if (ecver < 0x44) {
+		/*
+		 * We've seen a number of EC protocol changes; this driver
+		 * requires the latest EC protocol, supported by 0x44 and above.
+		 */
 		printk(KERN_NOTICE "OLPC EC version 0x%02x too old for "
-			"battery driver.\n", olpc_platform_info.ecver);
+			"battery driver.\n", ecver);
 		return -ENXIO;
 	}
 
-- 
2.19.1

[PATCH v2 17/17] power: supply: olpc_battery: Add OLPC XO 1.75 support

[Lubomir Rintel]

The battery and the protocol are essentially the same as OLPC XO 1.5,
but the responses from the EC are LSB first.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v1:
- s/s16 ecword_to_cpu/u16 ecword_to_cpu/
- s/u16 ec_byte/u16 ec_word/

 drivers/power/supply/olpc_battery.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
index ec5dfb8fcb8a..898e8a6128bb 100644
--- a/drivers/power/supply/olpc_battery.c
+++ b/drivers/power/supply/olpc_battery.c
@@ -56,6 +56,7 @@ struct olpc_battery_data {
 	struct power_supply *olpc_bat;
 	char bat_serial[17];
 	int new_proto;
+	int little_endian;
 };
 
 /*********************************************************************
@@ -321,6 +322,14 @@ static int olpc_bat_get_voltage_max_design(union power_supply_propval *val)
 	return ret;
 }
 
+static u16 ecword_to_cpu(struct olpc_battery_data *data, u16 ec_word)
+{
+	if (data->little_endian)
+		return le16_to_cpu(ec_word);
+	else
+		return be16_to_cpu(ec_word);
+}
+
 /*********************************************************************
  *		Battery properties
  *********************************************************************/
@@ -393,7 +402,7 @@ static int olpc_bat_get_property(struct power_supply *psy,
 		if (ret)
 			return ret;
 
-		val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32;
+		val->intval = ecword_to_cpu(data, ec_word) * 9760L / 32;
 		break;
 	case POWER_SUPPLY_PROP_CURRENT_AVG:
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
@@ -401,7 +410,7 @@ static int olpc_bat_get_property(struct power_supply *psy,
 		if (ret)
 			return ret;
 
-		val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120;
+		val->intval = ecword_to_cpu(data, ec_word) * 15625L / 120;
 		break;
 	case POWER_SUPPLY_PROP_CAPACITY:
 		ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
@@ -432,21 +441,21 @@ static int olpc_bat_get_property(struct power_supply *psy,
 		if (ret)
 			return ret;
 
-		val->intval = (s16)be16_to_cpu(ec_word) * 10 / 256;
+		val->intval = ecword_to_cpu(data, ec_word) * 10 / 256;
 		break;
 	case POWER_SUPPLY_PROP_TEMP_AMBIENT:
 		ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
 		if (ret)
 			return ret;
 
-		val->intval = (int)be16_to_cpu(ec_word) * 10 / 256;
+		val->intval = (int)ecword_to_cpu(data, ec_word) * 10 / 256;
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 		ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
 		if (ret)
 			return ret;
 
-		val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15;
+		val->intval = ecword_to_cpu(data, ec_word) * 6250 / 15;
 		break;
 	case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 		ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
@@ -626,6 +635,10 @@ static int olpc_battery_probe(struct platform_device *pdev)
 	if (ecver > 0x44) {
 		/* XO 1 or 1.5 with a new EC firmware. */
 		data->new_proto = 1;
+	} else if (of_find_compatible_node(NULL, NULL, "olpc,xo1.75-ec")) {
+		/* XO 1.75 */
+		data->new_proto = 1;
+		data->little_endian = 1;
 	} else if (ecver < 0x44) {
 		/*
 		 * We've seen a number of EC protocol changes; this driver
-- 
2.19.1

Re: [PATCH v2 02/17] dt-bindings: olpc,xo1.75-ec: Add OLPC XO-1.75 EC bindings

[Rob Herring]

On Fri, 16 Nov 2018 17:23:48 +0100, Lubomir Rintel wrote:
> The OLPC XO-1.75 Embedded Controller is a SPI master that uses extra
> signals for handshaking. It needs to know when is the slave (Linux)
> side's TX FIFO ready for transfer (the ready-gpio signal on the SPI
> controller node) and when does it wish to respond with a command (the
> cmd-gpio property).
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> 
> ---
> Changes since v1:
> - s/cmd-gpio/cmd-gpios/
> - s/ready-gpio/ready-gpios/ in the documentation paragraph
> - Remove status = "okay" from the example
> 
>  .../bindings/misc/olpc,xo1.75-ec.txt          | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v2 06/17] Platform: OLPC: Add XO-1.75 EC driver

[Darren Hart]

On Fri, Nov 16, 2018 at 05:23:52PM +0100, Lubomir Rintel wrote:
> It's based off the driver from the OLPC kernel sources. Somewhat
> modernized and cleaned up, for better or worse.
> 
> Modified to plug into the olpc-ec driver infrastructure (so that battery
> interface and debugfs could be reused) and the SPI slave framework.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> 

Hi Lubomir,

You asked for some tips on how to incorporate the changes in a patch
series like this.

Keep in mind that each patch should create an independent small
functional change. This makes it easier to review the patch and verify
that what you said you were going to do matches what the patch does. For
example, if you separate out the style, whitespace, ordering of
declarations into an initial first patch, then all that noise is removed
when the reviewer goes to check to implementation of one of the features
below.

This is a large patch, and should most certainly be broken up into
several smaller patches. Do cleanups first, followed by functional
changes. This ordering ensure that when a "git blame" is used in the
future to understand why a given line is what it is, the first hit will
be a functional change, and not a cleanup.

> ---
> Changes since v1:
> - Cosmetic style changes; whitespace, ordering of declarations and
>   #includes, remoted extra comas from sentinels

Please make this a separate change, possibly more than one, depending on
how many of these there are. This will reduce the size of the subsequent
patches, making them easier to review.

> - Count the terminating NUL in LOG_BUF_SIZE
> - Make olpc_xo175_ec_is_valid_cmd() return -EINVAL instead of -1
>   on error
> - Spell keyboard/touchpad in full for CHAN_KEYBOARD/TOUCHPAD messages
> - Use a #define for PM wakeup processing time
> - Log a message on unknown event
> - Escape logging payload with %*pE
> - Replace an open-coded min()
> - Correct an error code on short read
> - replaced PM callback #ifdefs with __maybe_unusedm SET_RUNTIME_PM_OPS
>   and SET_NOIRQ_SYSTEM_SLEEP_PM_OPS
> - dev_get_drvdata() instead of a round-trip through platform device
> - s/unsigned char x/u8 x/ in olpc_xo175_ec_resume()
> - Use GENMASK() instead of 0xffff for the event mask
> - Replace cmd tx/resp rx buffers with structures
> - Turned suspend hint arguments into a struct, and tidied up the comment

Just from these comments, each of these could be a separate patch. You
can group related things together, or those that change the same line or
function for example. Order them with cleanups / non-functional-changes
first, followed by functional changes.

> 
> Basically all of the above is based on the review by Andy Shevchenko.

Andy, what was your intent for Lubomir here? From the above, this looks
like it should be several patches to me.

Thanks,

-- 
Darren Hart
VMware Open Source Technology Center

Re: [PATCH v2 07/17] Platform: OLPC: Avoid a warning if the EC didn't register yet

[Darren Hart]

On Fri, Nov 16, 2018 at 05:23:53PM +0100, Lubomir Rintel wrote:
> Just return ENODEV, so that whoever attempted to use the EC call can

I think you meant EPROBE_DEFER here, but the language in the commit
message is a bit ambiguous here...

> defer their work.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> 
> ---
> Changes since v1:
> - EPROBE_DEFER instead of ENODEV
> 
>  drivers/platform/olpc/olpc-ec.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
> index 35a21c66cd0d..9ee993d5d54b 100644
> --- a/drivers/platform/olpc/olpc-ec.c
> +++ b/drivers/platform/olpc/olpc-ec.c
> @@ -116,8 +116,11 @@ int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf, size_t outlen)
>  	struct olpc_ec_priv *ec = ec_priv;
>  	struct ec_cmd_desc desc;
>  
> -	/* Ensure a driver and ec hook have been registered */
> -	if (WARN_ON(!ec_driver || !ec_driver->ec_cmd))
> +	/* Driver not yet registered. */
> +	if (!ec_driver)
> +		return -EPROBE_DEFER;
> +
> +	if (WARN_ON(!ec_driver->ec_cmd))
>  		return -ENODEV;
>  
>  	if (!ec)
> -- 
> 2.19.1
> 
> 

-- 
Darren Hart
VMware Open Source Technology Center

Re: [PATCH v2 13/17] power: supply: olpc_battery: Use DT to get battery version

[Darren Hart]

On Fri, Nov 16, 2018 at 05:23:59PM +0100, Lubomir Rintel wrote:
> Avoid using the x86 OLPC platform specific call to get the board
> version. It won't work on FDT-based ARM MMP2 platform.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> 
> ---
> Changes since v1:
> - Sort the new include a bit higher
> 
>  drivers/power/supply/olpc_battery.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
> index 5a97e42a3547..5323987d9284 100644
> --- a/drivers/power/supply/olpc_battery.c
> +++ b/drivers/power/supply/olpc_battery.c
> @@ -14,6 +14,7 @@
>  #include <linux/types.h>
>  #include <linux/err.h>
>  #include <linux/device.h>
> +#include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <linux/power_supply.h>
>  #include <linux/jiffies.h>
> @@ -622,11 +623,13 @@ static int olpc_battery_probe(struct platform_device *pdev)
>  	olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, NULL);
>  	if (IS_ERR(olpc_ac))
>  		return PTR_ERR(olpc_ac);
> -
> -	if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */
> +	if (of_property_match_string(pdev->dev.of_node, "compatible",
> +					"olpc,xo1.5-battery") >= 0) {
> +		/* XO-1.5 */
>  		olpc_bat_desc.properties = olpc_xo15_bat_props;
>  		olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
> -	} else { /* XO-1 */
> +	} else {
> +		/* XO-1 */
>  		olpc_bat_desc.properties = olpc_xo1_bat_props;
>  		olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
>  	}
> @@ -672,6 +675,7 @@ static int olpc_battery_remove(struct platform_device *pdev)
>  
>  static const struct of_device_id olpc_battery_ids[] = {
>  	{ .compatible = "olpc,xo1-battery" },
> +	{ .compatible = "olpc,xo1.5-battery" },

The code previously supported xo1.5 (it seems), and the commit message doesn't
mention changing the compatible string. Was this an intentional change? If so,
it should be mentioned in the commit message.

>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, olpc_battery_ids);
> -- 
> 2.19.1
> 
> 

-- 
Darren Hart
VMware Open Source Technology Center

Re: [PATCH v2 17/17] power: supply: olpc_battery: Add OLPC XO 1.75 support

[Darren Hart]

On Fri, Nov 16, 2018 at 05:24:03PM +0100, Lubomir Rintel wrote:
> The battery and the protocol are essentially the same as OLPC XO 1.5,
> but the responses from the EC are LSB first.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> 
> ---
> Changes since v1:
> - s/s16 ecword_to_cpu/u16 ecword_to_cpu/
> - s/u16 ec_byte/u16 ec_word/
> 
>  drivers/power/supply/olpc_battery.c | 23 ++++++++++++++++++-----
>  1 file changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c

...

> @@ -626,6 +635,10 @@ static int olpc_battery_probe(struct platform_device *pdev)
>  	if (ecver > 0x44) {
>  		/* XO 1 or 1.5 with a new EC firmware. */
>  		data->new_proto = 1;
> +	} else if (of_find_compatible_node(NULL, NULL, "olpc,xo1.75-ec")) {

This if/else blocks concerns me a bit, but I might just be missing some
context.

This tests both ecver as well as the OF compatible string, is this reliable? Do
we know that for all xo1.75-ec compatible nodes the ecver will be <= 0x44? Or,
is ecver undefined? If the latter, then perhaps this test should be performed
first?

if (of_find_compatible_node....x01.75-ec...)
	...
else if (ecver > 0x44)
	...
else
	...

And what happens when ecver == 0x44? We test for > and < but not ==, <=,
or >= in this block

> +		/* XO 1.75 */
> +		data->new_proto = 1;
> +		data->little_endian = 1;
>  	} else if (ecver < 0x44) {
>  		/*
>  		 * We've seen a number of EC protocol changes; this driver
> -- 
> 2.19.1
> 
> 

-- 
Darren Hart
VMware Open Source Technology Center

Re: [PATCH v2 06/17] Platform: OLPC: Add XO-1.75 EC driver

[Andy Shevchenko]

On Mon, Dec 3, 2018 at 1:13 AM Darren Hart <dvhart@infradead.org> wrote:
> On Fri, Nov 16, 2018 at 05:23:52PM +0100, Lubomir Rintel wrote:
> > It's based off the driver from the OLPC kernel sources. Somewhat
> > modernized and cleaned up, for better or worse.
> >
> > Modified to plug into the olpc-ec driver infrastructure (so that battery
> > interface and debugfs could be reused) and the SPI slave framework.

> > - Count the terminating NUL in LOG_BUF_SIZE
> > - Make olpc_xo175_ec_is_valid_cmd() return -EINVAL instead of -1
> >   on error
> > - Spell keyboard/touchpad in full for CHAN_KEYBOARD/TOUCHPAD messages
> > - Use a #define for PM wakeup processing time
> > - Log a message on unknown event
> > - Escape logging payload with %*pE
> > - Replace an open-coded min()
> > - Correct an error code on short read
> > - replaced PM callback #ifdefs with __maybe_unusedm SET_RUNTIME_PM_OPS
> >   and SET_NOIRQ_SYSTEM_SLEEP_PM_OPS
> > - dev_get_drvdata() instead of a round-trip through platform device
> > - s/unsigned char x/u8 x/ in olpc_xo175_ec_resume()
> > - Use GENMASK() instead of 0xffff for the event mask
> > - Replace cmd tx/resp rx buffers with structures
> > - Turned suspend hint arguments into a struct, and tidied up the comment
>
> Just from these comments, each of these could be a separate patch. You
> can group related things together, or those that change the same line or
> function for example. Order them with cleanups / non-functional-changes
> first, followed by functional changes.
>
> >
> > Basically all of the above is based on the review by Andy Shevchenko.
>
> Andy, what was your intent for Lubomir here? From the above, this looks
> like it should be several patches to me.

This is a new module, I don't see why it can't be one patch. For the
existing code I agree with you.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v2 11/17] dt-bindings: olpc_battery: Add XO-1.5 battery

[Sebastian Reichel]

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Hi,

On Fri, Nov 16, 2018 at 05:23:57PM +0100, Lubomir Rintel wrote:
> The XO-1 and XO-1.5 batteries apparently differ in an ability to report
> ambient temperature.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> 
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

-- Sebastian

> Changes since v1:
> - Collected Reviewed-by and Acked-by tags
> 
>  Documentation/devicetree/bindings/power/supply/olpc_battery.txt | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/power/supply/olpc_battery.txt b/Documentation/devicetree/bindings/power/supply/olpc_battery.txt
> index c8901b3992d9..8d87d6b35a98 100644
> --- a/Documentation/devicetree/bindings/power/supply/olpc_battery.txt
> +++ b/Documentation/devicetree/bindings/power/supply/olpc_battery.txt
> @@ -2,4 +2,4 @@ OLPC battery
>  ~~~~~~~~~~~~
>  
>  Required properties:
> -  - compatible : "olpc,xo1-battery"
> +  - compatible : "olpc,xo1-battery" or "olpc,xo1.5-battery"
> -- 
> 2.19.1
> 

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Re: [PATCH v2 13/17] power: supply: olpc_battery: Use DT to get battery version

[Sebastian Reichel]

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Hi,

On Fri, Nov 16, 2018 at 05:23:59PM +0100, Lubomir Rintel wrote:
> Avoid using the x86 OLPC platform specific call to get the board
> version. It won't work on FDT-based ARM MMP2 platform.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> 
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

I assume this patch cannot be applied to power-supply without patch
12 having been merged to avoid breaking XO1.5 devices temporarily?

-- Sebastian

> Changes since v1:
> - Sort the new include a bit higher
> 
>  drivers/power/supply/olpc_battery.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
> index 5a97e42a3547..5323987d9284 100644
> --- a/drivers/power/supply/olpc_battery.c
> +++ b/drivers/power/supply/olpc_battery.c
> @@ -14,6 +14,7 @@
>  #include <linux/types.h>
>  #include <linux/err.h>
>  #include <linux/device.h>
> +#include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <linux/power_supply.h>
>  #include <linux/jiffies.h>
> @@ -622,11 +623,13 @@ static int olpc_battery_probe(struct platform_device *pdev)
>  	olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, NULL);
>  	if (IS_ERR(olpc_ac))
>  		return PTR_ERR(olpc_ac);
> -
> -	if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */
> +	if (of_property_match_string(pdev->dev.of_node, "compatible",
> +					"olpc,xo1.5-battery") >= 0) {
> +		/* XO-1.5 */
>  		olpc_bat_desc.properties = olpc_xo15_bat_props;
>  		olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
> -	} else { /* XO-1 */
> +	} else {
> +		/* XO-1 */
>  		olpc_bat_desc.properties = olpc_xo1_bat_props;
>  		olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
>  	}
> @@ -672,6 +675,7 @@ static int olpc_battery_remove(struct platform_device *pdev)
>  
>  static const struct of_device_id olpc_battery_ids[] = {
>  	{ .compatible = "olpc,xo1-battery" },
> +	{ .compatible = "olpc,xo1.5-battery" },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, olpc_battery_ids);
> -- 
> 2.19.1
> 

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Re: [PATCH v2 14/17] power: supply: olpc_battery: Move priv data to a struct

[Sebastian Reichel]

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On Fri, Nov 16, 2018 at 05:24:00PM +0100, Lubomir Rintel wrote:
> The global variables for private data are not too nice. I'd like some
> more, and that would clutter the global name space even further.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> 
> ---
> Changes since v1:
> - Split out the move to devm_* into a separate patch
> 
>  drivers/power/supply/olpc_battery.c | 68 +++++++++++++++++------------
>  1 file changed, 40 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
> index 5323987d9284..b091f897c1d4 100644
> --- a/drivers/power/supply/olpc_battery.c
> +++ b/drivers/power/supply/olpc_battery.c
> @@ -53,6 +53,12 @@
>  
>  #define BAT_ADDR_MFR_TYPE	0x5F
>  
> +struct olpc_battery_data {
> +	struct power_supply *olpc_ac;
> +	struct power_supply *olpc_bat;
> +	char bat_serial[17];
> +};
> +
>  /*********************************************************************
>   *		Power
>   *********************************************************************/
> @@ -91,11 +97,8 @@ static const struct power_supply_desc olpc_ac_desc = {
>  	.get_property = olpc_ac_get_prop,
>  };
>  
> -static struct power_supply *olpc_ac;
> -
> -static char bat_serial[17]; /* Ick */
> -
> -static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte)
> +static int olpc_bat_get_status(struct olpc_battery_data *data,
> +		union power_supply_propval *val, uint8_t ec_byte)
>  {
>  	if (olpc_platform_info.ecver > 0x44) {
>  		if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
> @@ -326,6 +329,7 @@ static int olpc_bat_get_property(struct power_supply *psy,
>  				 enum power_supply_property psp,
>  				 union power_supply_propval *val)
>  {
> +	struct olpc_battery_data *data = power_supply_get_drvdata(psy);
>  	int ret = 0;
>  	__be16 ec_word;
>  	uint8_t ec_byte;
> @@ -347,7 +351,7 @@ static int olpc_bat_get_property(struct power_supply *psy,
>  
>  	switch (psp) {
>  	case POWER_SUPPLY_PROP_STATUS:
> -		ret = olpc_bat_get_status(val, ec_byte);
> +		ret = olpc_bat_get_status(data, val, ec_byte);
>  		if (ret)
>  			return ret;
>  		break;
> @@ -450,8 +454,8 @@ static int olpc_bat_get_property(struct power_supply *psy,
>  		if (ret)
>  			return ret;
>  
> -		sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
> -		val->strval = bat_serial;
> +		sprintf(data->bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf));
> +		val->strval = data->bat_serial;
>  		break;
>  	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
>  		ret = olpc_bat_get_voltage_max_design(val);
> @@ -579,17 +583,17 @@ static struct power_supply_desc olpc_bat_desc = {
>  	.use_for_apm = 1,
>  };
>  
> -static struct power_supply *olpc_bat;
> -
>  static int olpc_battery_suspend(struct platform_device *pdev,
>  				pm_message_t state)
>  {
> -	if (device_may_wakeup(&olpc_ac->dev))
> +	struct olpc_battery_data *data = platform_get_drvdata(pdev);
> +
> +	if (device_may_wakeup(&data->olpc_ac->dev))
>  		olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR);
>  	else
>  		olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR);
>  
> -	if (device_may_wakeup(&olpc_bat->dev))
> +	if (device_may_wakeup(&data->olpc_bat->dev))
>  		olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC
>  				   | EC_SCI_SRC_BATERR);
>  	else
> @@ -601,7 +605,8 @@ static int olpc_battery_suspend(struct platform_device *pdev,
>  
>  static int olpc_battery_probe(struct platform_device *pdev)
>  {
> -	int ret;
> +	struct power_supply_config psy_cfg = {};
> +	struct olpc_battery_data *data;

^ uninitialized pointer

>  	uint8_t status;
>  
>  	/*
> @@ -620,9 +625,13 @@ static int olpc_battery_probe(struct platform_device *pdev)
>  
>  	/* Ignore the status. It doesn't actually matter */
>  
> -	olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, NULL);
> -	if (IS_ERR(olpc_ac))
> -		return PTR_ERR(olpc_ac);
> +	psy_cfg.of_node = pdev->dev.of_node;
> +	psy_cfg.drv_data = data;

^ usage of uninitialized pointer. You are missing a kmalloc call.

-- Sebastian

> +	data->olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, &psy_cfg);
> +	if (IS_ERR(data->olpc_ac))
> +		return PTR_ERR(data->olpc_ac);
> +
>  	if (of_property_match_string(pdev->dev.of_node, "compatible",
>  					"olpc,xo1.5-battery") >= 0) {
>  		/* XO-1.5 */
> @@ -634,42 +643,45 @@ static int olpc_battery_probe(struct platform_device *pdev)
>  		olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
>  	}
>  
> -	olpc_bat = power_supply_register(&pdev->dev, &olpc_bat_desc, NULL);
> +	data->olpc_bat = power_supply_register(&pdev->dev, &olpc_bat_desc, &psy_cfg);
>  	if (IS_ERR(olpc_bat)) {
>  		ret = PTR_ERR(olpc_bat);
>  		goto battery_failed;
>  	}
>  
> -	ret = device_create_bin_file(&olpc_bat->dev, &olpc_bat_eeprom);
> +	ret = device_create_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
>  	if (ret)
>  		goto eeprom_failed;
>  
> -	ret = device_create_file(&olpc_bat->dev, &olpc_bat_error);
> +	ret = device_create_file(&data->olpc_bat->dev, &olpc_bat_error);
>  	if (ret)
>  		goto error_failed;
>  
>  	if (olpc_ec_wakeup_available()) {
> -		device_set_wakeup_capable(&olpc_ac->dev, true);
> -		device_set_wakeup_capable(&olpc_bat->dev, true);
> +		device_set_wakeup_capable(&data->olpc_ac->dev, true);
> +		device_set_wakeup_capable(&data->olpc_bat->dev, true);
>  	}
>  
>  	return 0;
>  
>  error_failed:
> -	device_remove_bin_file(&olpc_bat->dev, &olpc_bat_eeprom);
> +	device_remove_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
>  eeprom_failed:
> -	power_supply_unregister(olpc_bat);
> +	power_supply_unregister(data->olpc_bat);
>  battery_failed:
> -	power_supply_unregister(olpc_ac);
> +	power_supply_unregister(data->olpc_ac);
>  	return ret;
>  }
>  
>  static int olpc_battery_remove(struct platform_device *pdev)
>  {
> -	device_remove_file(&olpc_bat->dev, &olpc_bat_error);
> -	device_remove_bin_file(&olpc_bat->dev, &olpc_bat_eeprom);
> -	power_supply_unregister(olpc_bat);
> -	power_supply_unregister(olpc_ac);
> +	struct olpc_battery_data *data = platform_get_drvdata(pdev);
> +
> +	device_remove_file(&data->olpc_bat->dev, &olpc_bat_error);
> +	device_remove_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
> +	power_supply_unregister(data->olpc_bat);
> +	power_supply_unregister(data->olpc_ac);
> +
>  	return 0;
>  }
>  
> -- 
> 2.19.1
> 

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Re: [PATCH v2 15/17] power: supply: olpc_battery: Use devm_power_supply_register()

[Sebastian Reichel]

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Hi,

On Fri, Nov 16, 2018 at 05:24:01PM +0100, Lubomir Rintel wrote:
> This simplifies the error handling.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> 
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

-- Sebastian

> Changes since v1:
> - This was split off the "power: supply: olpc_battery: Move priv data to
>   a struct" patch.
> 
>  drivers/power/supply/olpc_battery.c | 19 +++++--------------
>  1 file changed, 5 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
> index b091f897c1d4..4433eb10a23d 100644
> --- a/drivers/power/supply/olpc_battery.c
> +++ b/drivers/power/supply/olpc_battery.c
> @@ -628,7 +628,7 @@ static int olpc_battery_probe(struct platform_device *pdev)
>  	psy_cfg.of_node = pdev->dev.of_node;
>  	psy_cfg.drv_data = data;
>  
> -	data->olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, &psy_cfg);
> +	data->olpc_ac = devm_power_supply_register(&pdev->dev, &olpc_ac_desc, &psy_cfg);
>  	if (IS_ERR(data->olpc_ac))
>  		return PTR_ERR(data->olpc_ac);
>  
> @@ -643,15 +643,13 @@ static int olpc_battery_probe(struct platform_device *pdev)
>  		olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
>  	}
>  
> -	data->olpc_bat = power_supply_register(&pdev->dev, &olpc_bat_desc, &psy_cfg);
> -	if (IS_ERR(olpc_bat)) {
> -		ret = PTR_ERR(olpc_bat);
> -		goto battery_failed;
> -	}
> +	data->olpc_bat = devm_power_supply_register(&pdev->dev, &olpc_bat_desc, &psy_cfg);
> +	if (IS_ERR(data->olpc_bat))
> +		return PTR_ERR(data->olpc_bat);
>  
>  	ret = device_create_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
>  	if (ret)
> -		goto eeprom_failed;
> +		return ret;
>  
>  	ret = device_create_file(&data->olpc_bat->dev, &olpc_bat_error);
>  	if (ret)
> @@ -666,10 +664,6 @@ static int olpc_battery_probe(struct platform_device *pdev)
>  
>  error_failed:
>  	device_remove_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
> -eeprom_failed:
> -	power_supply_unregister(data->olpc_bat);
> -battery_failed:
> -	power_supply_unregister(data->olpc_ac);
>  	return ret;
>  }
>  
> @@ -679,9 +673,6 @@ static int olpc_battery_remove(struct platform_device *pdev)
>  
>  	device_remove_file(&data->olpc_bat->dev, &olpc_bat_error);
>  	device_remove_bin_file(&data->olpc_bat->dev, &olpc_bat_eeprom);
> -	power_supply_unregister(data->olpc_bat);
> -	power_supply_unregister(data->olpc_ac);
> -
>  	return 0;
>  }
>  
> -- 
> 2.19.1
> 

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Re: [PATCH v2 16/17] power: supply: olpc_battery: Avoid using platform_info

[Sebastian Reichel]

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Hi,

On Fri, Nov 16, 2018 at 05:24:02PM +0100, Lubomir Rintel wrote:
> This wouldn't work on the DT-based ARM platform. Let's read the EC version
> directly from the EC driver instead.
> 
> This makes the driver no longer x86 specific.
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> 
> ---
> Changes since v1:
> - Use uint8_t instead of unsigned char [1] for ecver
> 
>  drivers/power/supply/Kconfig        |  2 +-
>  drivers/power/supply/olpc_battery.c | 35 +++++++++++++++++++++--------
>  2 files changed, 27 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index f27cf0709500..dd7ae1431098 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -151,7 +151,7 @@ config BATTERY_PMU
>  
>  config BATTERY_OLPC
>  	tristate "One Laptop Per Child battery"
> -	depends on X86_32 && OLPC
> +	depends on OLPC
>  	help
>  	  Say Y to enable support for the battery on the OLPC laptop.
>  
> diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
> index 4433eb10a23d..ec5dfb8fcb8a 100644
> --- a/drivers/power/supply/olpc_battery.c
> +++ b/drivers/power/supply/olpc_battery.c
> @@ -20,8 +20,6 @@
>  #include <linux/jiffies.h>
>  #include <linux/sched.h>
>  #include <linux/olpc-ec.h>
> -#include <asm/olpc.h>
> -
>  
>  #define EC_BAT_VOLTAGE	0x10	/* uint16_t,	*9.76/32,    mV   */
>  #define EC_BAT_CURRENT	0x11	/* int16_t,	*15.625/120, mA   */
> @@ -57,6 +55,7 @@ struct olpc_battery_data {
>  	struct power_supply *olpc_ac;
>  	struct power_supply *olpc_bat;
>  	char bat_serial[17];
> +	int new_proto;
>  };
>  
>  /*********************************************************************
> @@ -100,7 +99,7 @@ static const struct power_supply_desc olpc_ac_desc = {
>  static int olpc_bat_get_status(struct olpc_battery_data *data,
>  		union power_supply_propval *val, uint8_t ec_byte)
>  {
> -	if (olpc_platform_info.ecver > 0x44) {
> +	if (data->new_proto) {
>  		if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE))
>  			val->intval = POWER_SUPPLY_STATUS_CHARGING;
>  		else if (ec_byte & BAT_STAT_DISCHARGING)
> @@ -608,14 +607,32 @@ static int olpc_battery_probe(struct platform_device *pdev)
>  	struct power_supply_config psy_cfg = {};
>  	struct olpc_battery_data *data;
>  	uint8_t status;
> +	uint8_t ecver;
> +	int ret;
> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +	platform_set_drvdata(pdev, data);

This ended up in the wrong patch. Otherwise

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

-- Sebastian

> +	/* See if the EC is already there and get the EC revision */
> +	ret = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, &ecver, 1);
> +	if (ret) {
> +		if (ret == -ENODEV)
> +			return -EPROBE_DEFER;
> +		return ret;
> +	}
>  
> -	/*
> -	 * We've seen a number of EC protocol changes; this driver requires
> -	 * the latest EC protocol, supported by 0x44 and above.
> -	 */
> -	if (olpc_platform_info.ecver < 0x44) {
> +	if (ecver > 0x44) {
> +		/* XO 1 or 1.5 with a new EC firmware. */
> +		data->new_proto = 1;
> +	} else if (ecver < 0x44) {
> +		/*
> +		 * We've seen a number of EC protocol changes; this driver
> +		 * requires the latest EC protocol, supported by 0x44 and above.
> +		 */
>  		printk(KERN_NOTICE "OLPC EC version 0x%02x too old for "
> -			"battery driver.\n", olpc_platform_info.ecver);
> +			"battery driver.\n", ecver);
>  		return -ENXIO;
>  	}
>  
> -- 
> 2.19.1
> 

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Re: [PATCH v2 01/17] power: supply: olpc_battery: correct the temperature units

[Sebastian Reichel]

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Hi,

On Fri, Nov 16, 2018 at 05:23:47PM +0100, Lubomir Rintel wrote:
> According to [1] and [2], the temperature values are in tenths of degree
> Celsius. Exposing the Celsius value makes the battery appear on fire:
> 
>   $ upower -i /org/freedesktop/UPower/devices/battery_olpc_battery
>   ...
>       temperature:         236.9 degrees C
> 
> Tested on OLPC XO-1 and OLPC XO-1.75 laptops.
> 
> [1] include/linux/power_supply.h
> [2] Documentation/power/power_supply_class.txt
> 
> Fixes: fb972873a767 ("[BATTERY] One Laptop Per Child power/battery driver")
> Cc: stable@vger.kernel.org
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> Acked-by: Pavel Machek <pavel@ucw.cz>
> 
> ---

This is queued to next.

-- Sebastian

> Changes since v1:
> - Add Fixes tag and an Ack
> 
>  drivers/power/supply/olpc_battery.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
> index 6da79ae14860..5a97e42a3547 100644
> --- a/drivers/power/supply/olpc_battery.c
> +++ b/drivers/power/supply/olpc_battery.c
> @@ -428,14 +428,14 @@ static int olpc_bat_get_property(struct power_supply *psy,
>  		if (ret)
>  			return ret;
>  
> -		val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256;
> +		val->intval = (s16)be16_to_cpu(ec_word) * 10 / 256;
>  		break;
>  	case POWER_SUPPLY_PROP_TEMP_AMBIENT:
>  		ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
>  		if (ret)
>  			return ret;
>  
> -		val->intval = (int)be16_to_cpu(ec_word) * 100 / 256;
> +		val->intval = (int)be16_to_cpu(ec_word) * 10 / 256;
>  		break;
>  	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
>  		ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
> -- 
> 2.19.1
> 

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Re: [PATCH v2 17/17] power: supply: olpc_battery: Add OLPC XO 1.75 support

[Lubomir Rintel]

On Sun, 2018-12-02 at 15:34 -0800, Darren Hart wrote:
> On Fri, Nov 16, 2018 at 05:24:03PM +0100, Lubomir Rintel wrote:
> > The battery and the protocol are essentially the same as OLPC XO 1.5,
> > but the responses from the EC are LSB first.
> > 
> > Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> > Acked-by: Pavel Machek <pavel@ucw.cz>
> > 
> > ---
> > Changes since v1:
> > - s/s16 ecword_to_cpu/u16 ecword_to_cpu/
> > - s/u16 ec_byte/u16 ec_word/
> > 
> >  drivers/power/supply/olpc_battery.c | 23 ++++++++++++++++++-----
> >  1 file changed, 18 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
> 
> ...
> 
> > @@ -626,6 +635,10 @@ static int olpc_battery_probe(struct platform_device *pdev)
> >  	if (ecver > 0x44) {
> >  		/* XO 1 or 1.5 with a new EC firmware. */
> >  		data->new_proto = 1;
> > +	} else if (of_find_compatible_node(NULL, NULL, "olpc,xo1.75-ec")) {
> 
> This if/else blocks concerns me a bit, but I might just be missing some
> context.
> 
> This tests both ecver as well as the OF compatible string, is this reliable? Do
> we know that for all xo1.75-ec compatible nodes the ecver will be <= 0x44? Or,
> is ecver undefined? If the latter, then perhaps this test should be performed
> first?
> 
> if (of_find_compatible_node....x01.75-ec...)
> 	...
> else if (ecver > 0x44)
> 	...
> else
> 	...
> 
> And what happens when ecver == 0x44? We test for > and < but not ==, <=,
> or >= in this block

You're right, the conditionals are not correct. On XO 1.75 the
versioning is different (now at level 0x05) and uninteresting,
therefore the XO 1.75 check needs to go first.

On XO 1 and XO 1.75, we don't support < 0x44. 0x44 is okay, though uses
stays with an old protocol, and > 0x44 uses a new protocol.

Will follow up with a new version of the patch soon.

> 
> > +		/* XO 1.75 */
> > +		data->new_proto = 1;
> > +		data->little_endian = 1;
> >  	} else if (ecver < 0x44) {
> >  		/*
> >  		 * We've seen a number of EC protocol changes; this driver
> > -- 
> > 2.19.1

Thanks
Lubo

Re: [PATCH v2 13/17] power: supply: olpc_battery: Use DT to get battery version

[Lubomir Rintel]

On Wed, 2018-12-05 at 21:54 +0100, Sebastian Reichel wrote:
> Hi,
> 
> On Fri, Nov 16, 2018 at 05:23:59PM +0100, Lubomir Rintel wrote:
> > Avoid using the x86 OLPC platform specific call to get the board
> > version. It won't work on FDT-based ARM MMP2 platform.
> > 
> > Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> > Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> > Acked-by: Pavel Machek <pavel@ucw.cz>
> > 
> > ---
> 
> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> 
> I assume this patch cannot be applied to power-supply without patch
> 12 having been merged to avoid breaking XO1.5 devices temporarily?

That is true. What's the correct way to deal with a situation like
this? Just hold the patch until the other changes get in, perhaps via
linux-platform-drivers-x86.git? Or maybe this can go in together via
that tree along with the other patches?

Thanks
Lubo

> -- Sebastian
> 
> > Changes since v1:
> > - Sort the new include a bit higher
> > 
> >  drivers/power/supply/olpc_battery.c | 10 +++++++---
> >  1 file changed, 7 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/power/supply/olpc_battery.c
> > b/drivers/power/supply/olpc_battery.c
> > index 5a97e42a3547..5323987d9284 100644
> > --- a/drivers/power/supply/olpc_battery.c
> > +++ b/drivers/power/supply/olpc_battery.c
> > @@ -14,6 +14,7 @@
> >  #include <linux/types.h>
> >  #include <linux/err.h>
> >  #include <linux/device.h>
> > +#include <linux/of.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/power_supply.h>
> >  #include <linux/jiffies.h>
> > @@ -622,11 +623,13 @@ static int olpc_battery_probe(struct
> > platform_device *pdev)
> >  	olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc,
> > NULL);
> >  	if (IS_ERR(olpc_ac))
> >  		return PTR_ERR(olpc_ac);
> > -
> > -	if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */
> > +	if (of_property_match_string(pdev->dev.of_node, "compatible",
> > +					"olpc,xo1.5-battery") >= 0) {
> > +		/* XO-1.5 */
> >  		olpc_bat_desc.properties = olpc_xo15_bat_props;
> >  		olpc_bat_desc.num_properties =
> > ARRAY_SIZE(olpc_xo15_bat_props);
> > -	} else { /* XO-1 */
> > +	} else {
> > +		/* XO-1 */
> >  		olpc_bat_desc.properties = olpc_xo1_bat_props;
> >  		olpc_bat_desc.num_properties =
> > ARRAY_SIZE(olpc_xo1_bat_props);
> >  	}
> > @@ -672,6 +675,7 @@ static int olpc_battery_remove(struct
> > platform_device *pdev)
> >  
> >  static const struct of_device_id olpc_battery_ids[] = {
> >  	{ .compatible = "olpc,xo1-battery" },
> > +	{ .compatible = "olpc,xo1.5-battery" },
> >  	{}
> >  };
> >  MODULE_DEVICE_TABLE(of, olpc_battery_ids);
> > -- 
> > 2.19.1
> >