[PATCH v4 00/15] Add support for OLPC XO 1.75 Embedded Controller

[PATCH v4 00/15] Add support for OLPC XO 1.75 Embedded Controller

[Lubomir Rintel]

Hello!

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

It hopefully incorporated all feedback received previously and also
fixes the kbuild test bot failures. The failed builds were generally
caused by configurations where the EC driver was built as module.

It turned out that the patch that turned the OLPC EC common code into
a module was not the brightest idea. I now dropped it and modified the
04/15 to not require it.

Also, the 01/15 patch has been added to allow the module to provide a
reboot handler. Patch 15/15 depends on it.

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.

[01/15] ARM: export arm_pm_restart()
[02/15] dt-bindings: olpc,xo1.75-ec: Add OLPC XO-1.75 EC bindings
[03/15] Platform: OLPC: Remove an unused include
[04/15] Platform: OLPC: Add XO-1.75 EC driver
[05/15] Platform: OLPC: Avoid a warning if the EC didn't register yet
[06/15] Platform: OLPC: Move EC-specific functionality out from x86
[07/15] Platform: OLPC: Use BIT() and GENMASK() for event masks
[08/15] Platform: OLPC: add a regulator for the DCON
[09/15] dt-bindings: olpc_battery: Add XO-1.5 battery
[10/15] x86, olpc: Use a correct version when making up a battery node
[11/15] power: supply: olpc_battery: Use DT to get battery version
[12/15] power: supply: olpc_battery: Move priv data to a struct
[13/15] power: supply: olpc_battery: Use devm_power_supply_register()
[14/15] power: supply: olpc_battery: Avoid using platform_info
[15/15] power: supply: olpc_battery: Add OLPC XO 1.75 support

Lubo



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[PATCH v4 01/15] ARM: export arm_pm_restart()

[Lubomir Rintel]

The OLPC XO 1.75 laptop is rebooted with a command to the Embedded
Controller. The EC driver should be a module, since most people don't need
it to be compiled in.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
---
Changes since v3:
- Added the patch to the set

 arch/arm/kernel/reboot.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/kernel/reboot.c b/arch/arm/kernel/reboot.c
index 3b2aa9a9fe26..71016cf19b86 100644
--- a/arch/arm/kernel/reboot.c
+++ b/arch/arm/kernel/reboot.c
@@ -22,6 +22,7 @@ typedef void (*phys_reset_t)(unsigned long, bool);
  * Function pointers to optional machine specific functions
  */
 void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
+EXPORT_SYMBOL_GPL(arm_pm_restart);
 void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);
 
-- 
2.20.1


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Re: [PATCH v4 01/15] ARM: export arm_pm_restart()

[Russell King - ARM Linux]

On Tue, Jan 08, 2019 at 06:58:04PM +0100, Lubomir Rintel wrote:
> The OLPC XO 1.75 laptop is rebooted with a command to the Embedded
> Controller. The EC driver should be a module, since most people don't need
> it to be compiled in.

Why do you need this - is there a reason why you can't hook onto the
restart_handler_list using register_restart_handler()?  The registered
handlers are passed the command.

I would rather this is not exported to modules, it is generally unsafe
to hook stuff by directly poking function pointers from module code.

-- 
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Re: [PATCH v4 01/15] ARM: export arm_pm_restart()

[Lubomir Rintel]

On Tue, 2019-01-08 at 23:31 +0000, Russell King - ARM Linux wrote:
> On Tue, Jan 08, 2019 at 06:58:04PM +0100, Lubomir Rintel wrote:
> > The OLPC XO 1.75 laptop is rebooted with a command to the Embedded
> > Controller. The EC driver should be a module, since most people don't need
> > it to be compiled in.
> 
> Why do you need this - is there a reason why you can't hook onto the
> restart_handler_list using register_restart_handler()?  The registered
> handlers are passed the command.

Actually, yes. The restart handlers are invoked in atomic context, but
the EC communication needs to block. (The 1.75 EC is actually a SPI
master: a command it initiated by poking a GPIO and waiting until EC
tells us it's ready to read a command.)

Sorry for not mentioning that earlier, I forgot that it is the case.

> I would rather this is not exported to modules, it is generally unsafe
> to hook stuff by directly poking function pointers from module code.

Lubo


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[PATCH v4 02/15] 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>;
+		};
+	};
-- 
2.20.1


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[PATCH v4 03/15] 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;
-- 
2.20.1


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[PATCH v4 04/15] 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 v3:
- Introduce CONFIG_OLPC_EC symbol to enable parts common to this driver
  and the X86 OLPC EC machinery.

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.

 arch/x86/Kconfig                      |   1 +
 drivers/platform/Kconfig              |   2 +
 drivers/platform/Makefile             |   2 +-
 drivers/platform/olpc/Kconfig         |  14 +
 drivers/platform/olpc/Makefile        |   3 +-
 drivers/platform/olpc/olpc-xo175-ec.c | 763 ++++++++++++++++++++++++++
 include/linux/olpc-ec.h               |   4 +-
 7 files changed, 785 insertions(+), 4 deletions(-)
 create mode 100644 drivers/platform/olpc/Kconfig
 create mode 100644 drivers/platform/olpc/olpc-xo175-ec.c

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6185d4f33296..29063be6fa22 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2714,6 +2714,7 @@ config OLPC
 	select OF
 	select OF_PROMTREE
 	select IRQ_DOMAIN
+	select OLPC_EC
 	---help---
 	  Add support for detecting the unique features of the OLPC
 	  XO hardware.
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/Makefile b/drivers/platform/Makefile
index 4b2ce58bcd9c..6fda58c021ca 100644
--- a/drivers/platform/Makefile
+++ b/drivers/platform/Makefile
@@ -6,6 +6,6 @@
 obj-$(CONFIG_X86)		+= x86/
 obj-$(CONFIG_MELLANOX_PLATFORM)	+= mellanox/
 obj-$(CONFIG_MIPS)		+= mips/
-obj-$(CONFIG_OLPC)		+= olpc/
+obj-$(CONFIG_OLPC_EC)		+= olpc/
 obj-$(CONFIG_GOLDFISH)		+= goldfish/
 obj-$(CONFIG_CHROME_PLATFORMS)	+= chrome/
diff --git a/drivers/platform/olpc/Kconfig b/drivers/platform/olpc/Kconfig
new file mode 100644
index 000000000000..066e439bf4fc
--- /dev/null
+++ b/drivers/platform/olpc/Kconfig
@@ -0,0 +1,14 @@
+config OLPC_EC
+	bool
+
+config OLPC_XO175_EC
+	tristate "OLPC XO 1.75 Embedded Controller"
+	depends on ARM && (ARCH_MMP || COMPILE_TEST)
+	select SPI_SLAVE
+	select OLPC_EC
+	help
+	  Include support for the OLPC XO Embedded Controller (EC). The EC
+	  provides various platform services, including support for the power,
+	  button, restart, shutdown and battery charging status.
+
+	  Unless you have an OLPC XO laptop, you will want to say N.
diff --git a/drivers/platform/olpc/Makefile b/drivers/platform/olpc/Makefile
index dc8b26bc7209..01fe6ba01665 100644
--- a/drivers/platform/olpc/Makefile
+++ b/drivers/platform/olpc/Makefile
@@ -1,4 +1,5 @@
 #
 # OLPC XO platform-specific drivers
 #
-obj-$(CONFIG_OLPC)		+= olpc-ec.o
+obj-$(CONFIG_OLPC_EC)		+= olpc-ec.o
+obj-$(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");
diff --git a/include/linux/olpc-ec.h b/include/linux/olpc-ec.h
index 79bdc6328c52..cafd152b3b1b 100644
--- a/include/linux/olpc-ec.h
+++ b/include/linux/olpc-ec.h
@@ -26,7 +26,7 @@ struct olpc_ec_driver {
 	int (*ec_cmd)(u8, u8 *, size_t, u8 *, size_t, void *);
 };
 
-#ifdef CONFIG_OLPC
+#ifdef CONFIG_OLPC_EC
 
 extern void olpc_ec_driver_register(struct olpc_ec_driver *drv, void *arg);
 
@@ -38,6 +38,6 @@ extern int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf,
 static inline int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf,
 		size_t outlen) { return -ENODEV; }
 
-#endif /* CONFIG_OLPC */
+#endif /* CONFIG_OLPC_EC */
 
 #endif /* _LINUX_OLPC_EC_H */
-- 
2.20.1


_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v4 05/15] Platform: OLPC: Avoid a warning if the EC didn't register yet

[Lubomir Rintel]

Just return EPROBE_DEFER, 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 v2:
- Adjust the commit message for the s/ENODEV/EPROBE_DEFER/ change

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 981955dce926..d7d51a851937 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -118,8 +118,11 @@ 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)
-- 
2.20.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v4 06/15] 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 d7d51a851937..0e1449d7aefc 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -32,6 +32,7 @@ struct ec_cmd_desc {
 
 struct olpc_ec_priv {
 	struct olpc_ec_driver *drv;
+	u8 version;
 	struct work_struct worker;
 	struct mutex cmd_lock;
 
@@ -41,6 +42,12 @@ 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
@@ -152,6 +159,88 @@ 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
 
 /*
@@ -279,14 +368,16 @@ 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;
 }
 
@@ -296,6 +387,8 @@ 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 cafd152b3b1b..e28f72416a57 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_EC
@@ -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_EC */
 
 #endif /* _LINUX_OLPC_EC_H */
-- 
2.20.1


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Re: [PATCH v4 06/15] Platform: OLPC: Move EC-specific functionality out from x86

[Andy Shevchenko]

On Tue, Jan 8, 2019 at 7:59 PM Lubomir Rintel <lkundrak@v3.sk> wrote:
>
> 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>

>  #define OLPC_F_PRESENT         0x01
>  #define OLPC_F_DCON            0x02
> -#define OLPC_F_EC_WIDE_SCI     0x04

Still same concern, i.e. if the initially added definitions are
coupled together by some reason, why we split them?
As I told either move all, or none or put in commit message how
decoupling would benefit.

> +       /* 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);

No space is needed in "(void *)&ec_word".

> +       } else {

> +               unsigned char ec_byte = bits & 0xff;

Shouldn't be u8?

> +               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)
> +{
> +       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;

u8?

> +
> +               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);

-- 
With Best Regards,
Andy Shevchenko

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Re: [PATCH v4 06/15] Platform: OLPC: Move EC-specific functionality out from x86

[Lubomir Rintel]

On Wed, 2019-01-09 at 13:23 +0200, Andy Shevchenko wrote:
> On Tue, Jan 8, 2019 at 7:59 PM Lubomir Rintel <lkundrak@v3.sk> wrote:
> > 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>
> >  #define OLPC_F_PRESENT         0x01
> >  #define OLPC_F_DCON            0x02
> > -#define OLPC_F_EC_WIDE_SCI     0x04
> 
> Still same concern, i.e. if the initially added definitions are
> coupled together by some reason, why we split them?
> As I told either move all, or none or put in commit message how
> decoupling would benefit.

I'm not moving this one -- I'm deleting it, because it's no longer used
or useful. I don't mind keeping it there if you think it should stay
though.

> > +       /* 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);
> 
> No space is needed in "(void *)&ec_word".
> 
> > +       } else {
> > +               unsigned char ec_byte = bits & 0xff;
> 
> Shouldn't be u8?
> 
> > +               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)
> > +{
> > +       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;
> 
> u8?
> 
> > +
> > +               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);

I'll follow up with fixes for the above.

Thanks.

Lubo


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[PATCH v4 07/15] 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 e28f72416a57..c4602364e909 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;
 
-- 
2.20.1


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Re: [PATCH v4 07/15] Platform: OLPC: Use BIT() and GENMASK() for event masks

[Andy Shevchenko]

On Tue, Jan 8, 2019 at 7:58 PM Lubomir Rintel <lkundrak@v3.sk> wrote:
>
> Just a cosmetic tidy-up.
>

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

> 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 e28f72416a57..c4602364e909 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;
>
> --
> 2.20.1
>


-- 
With Best Regards,
Andy Shevchenko

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[PATCH v4 08/15] 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 066e439bf4fc..02b232c34444 100644
--- a/drivers/platform/olpc/Kconfig
+++ b/drivers/platform/olpc/Kconfig
@@ -1,4 +1,5 @@
 config OLPC_EC
+	select REGULATOR
 	bool
 
 config OLPC_XO175_EC
diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
index 0e1449d7aefc..e9cc95da1548 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -16,6 +16,7 @@
 #include <linux/workqueue.h>
 #include <linux/init.h>
 #include <linux/list.h>
+#include <linux/regulator/driver.h>
 #include <linux/olpc-ec.h>
 
 struct ec_cmd_desc {
@@ -36,6 +37,10 @@ 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;
@@ -346,9 +351,61 @@ 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)
@@ -376,6 +433,16 @@ 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;
-- 
2.20.1


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[PATCH v4 09/15] 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>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

---
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"
-- 
2.20.1


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[PATCH v4 10/15] 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 | 84 +++++++++++++++++++++-----------
 1 file changed, 56 insertions(+), 28 deletions(-)

diff --git a/arch/x86/platform/olpc/olpc_dt.c b/arch/x86/platform/olpc/olpc_dt.c
index b4ab779f1d47..8557add82752 100644
--- a/arch/x86/platform/olpc/olpc_dt.c
+++ b/arch/x86/platform/olpc/olpc_dt.c
@@ -217,10 +217,28 @@ 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;
 
@@ -228,41 +246,51 @@ 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)
-- 
2.20.1


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[PATCH v4 11/15] 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. That wouldn't work on FDT-based ARM MMP2 platform.

Add the XO 1.5 compatible string too. This is actually not completely
necessary as the battery nodes on XO 1.5 claim to be compatible with
"olpc,xo1-battery", but there are, in fact, differencies.

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>

---
Changes since v2:
- Clarify the XO 1 compatibility in the commit message.

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);
-- 
2.20.1


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[PATCH v4 12/15] 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 v2:
- Bring the allocaton of the priv data structure here

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

 drivers/power/supply/olpc_battery.c | 73 ++++++++++++++++++-----------
 1 file changed, 45 insertions(+), 28 deletions(-)

diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
index 5323987d9284..c024aae01cb1 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
@@ -601,9 +605,15 @@ 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;
 
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, data);
+
 	/*
 	 * We've seen a number of EC protocol changes; this driver requires
 	 * the latest EC protocol, supported by 0x44 and above.
@@ -620,9 +630,13 @@ 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 +648,45 @@ 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;
 }
 
-- 
2.20.1


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[PATCH v4 13/15] power: supply: olpc_battery: Use devm_power_supply_register()

[Lubomir Rintel]

This simplifies the error handling.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

---
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 c024aae01cb1..0c9f7ce6b26b 100644
--- a/drivers/power/supply/olpc_battery.c
+++ b/drivers/power/supply/olpc_battery.c
@@ -633,7 +633,7 @@ 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);
 
@@ -648,15 +648,13 @@ 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)
@@ -671,10 +669,6 @@ 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;
 }
 
@@ -684,9 +678,6 @@ 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;
 }
 
-- 
2.20.1


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[PATCH v4 14/15] 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>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

---
Changes since v2:
- Move the priv data allocation hunk from this patch to a proper place

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

 drivers/power/supply/Kconfig        |  2 +-
 drivers/power/supply/olpc_battery.c | 27 ++++++++++++++++++---------
 2 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index e901b9879e7e..67a3bb26da39 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 0c9f7ce6b26b..8ebb4284cf05 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)
@@ -608,19 +607,29 @@ 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);
 
-	/*
-	 * 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) {
+	/* 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)
+		return ret;
+
+	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;
 	}
 
-- 
2.20.1


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[PATCH v4 15/15] 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 v2:
- Fix the version conditional

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

 drivers/power/supply/Kconfig        |  2 +-
 drivers/power/supply/olpc_battery.c | 25 +++++++++++++++++++------
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 67a3bb26da39..66e4d1958de3 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 OLPC
+	depends on OLPC_EC
 	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 8ebb4284cf05..e32c1e457026 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);
@@ -620,7 +629,11 @@ static int olpc_battery_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	if (ecver > 0x44) {
+	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) {
 		/* XO 1 or 1.5 with a new EC firmware. */
 		data->new_proto = 1;
 	} else if (ecver < 0x44) {
-- 
2.20.1


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Re: [PATCH v4 00/15] Add support for OLPC XO 1.75 Embedded Controller

[Andy Shevchenko]

On Tue, Jan 8, 2019 at 7:58 PM Lubomir Rintel <lkundrak@v3.sk> wrote:
>
> Hello!
>
> This is a fourth spin of the patch set that adds support for the
> Embedded Controller on an OLPC XO 1.75 machine.
>
> It hopefully incorporated all feedback received previously and also
> fixes the kbuild test bot failures. The failed builds were generally
> caused by configurations where the EC driver was built as module.
>
> It turned out that the patch that turned the OLPC EC common code into
> a module was not the brightest idea. I now dropped it and modified the
> 04/15 to not require it.
>
> Also, the 01/15 patch has been added to allow the module to provide a
> reboot handler. Patch 15/15 depends on it.

Isn't it a quite big distance between provider and consumer?
Especially taking into consideration concerns about patch 1 which
blocks the series.
Perhaps you may drop it as a patch 1 and do something on top of patch
15 as feature extension?


>
> 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.
>
> [01/15] ARM: export arm_pm_restart()
> [02/15] dt-bindings: olpc,xo1.75-ec: Add OLPC XO-1.75 EC bindings
> [03/15] Platform: OLPC: Remove an unused include
> [04/15] Platform: OLPC: Add XO-1.75 EC driver
> [05/15] Platform: OLPC: Avoid a warning if the EC didn't register yet
> [06/15] Platform: OLPC: Move EC-specific functionality out from x86
> [07/15] Platform: OLPC: Use BIT() and GENMASK() for event masks
> [08/15] Platform: OLPC: add a regulator for the DCON
> [09/15] dt-bindings: olpc_battery: Add XO-1.5 battery
> [10/15] x86, olpc: Use a correct version when making up a battery node
> [11/15] power: supply: olpc_battery: Use DT to get battery version
> [12/15] power: supply: olpc_battery: Move priv data to a struct
> [13/15] power: supply: olpc_battery: Use devm_power_supply_register()
> [14/15] power: supply: olpc_battery: Avoid using platform_info
> [15/15] power: supply: olpc_battery: Add OLPC XO 1.75 support
>
> Lubo
>
>


-- 
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Andy Shevchenko

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Re: [PATCH v4 00/15] Add support for OLPC XO 1.75 Embedded Controller

[Lubomir Rintel]

On Wed, 2019-01-09 at 13:15 +0200, Andy Shevchenko wrote:
> On Tue, Jan 8, 2019 at 7:58 PM Lubomir Rintel <lkundrak@v3.sk> wrote:
> > Hello!
> > 
> > This is a fourth spin of the patch set that adds support for the
> > Embedded Controller on an OLPC XO 1.75 machine.
> > 
> > It hopefully incorporated all feedback received previously and also
> > fixes the kbuild test bot failures. The failed builds were
> > generally
> > caused by configurations where the EC driver was built as module.
> > 
> > It turned out that the patch that turned the OLPC EC common code
> > into
> > a module was not the brightest idea. I now dropped it and modified
> > the
> > 04/15 to not require it.
> > 
> > Also, the 01/15 patch has been added to allow the module to provide
> > a
> > reboot handler. Patch 15/15 depends on it.
> 
> Isn't it a quite big distance between provider and consumer?
> Especially taking into consideration concerns about patch 1 which
> blocks the series.
> Perhaps you may drop it as a patch 1 and do something on top of patch
> 15 as feature extension?

Yes, that is a good idea. I'll do so when I submit a new version of the
set (in few days' time).

I think the battery part can be split from the EC part too. Would that
be a good idea to send them as separate patch sets next time? It seems
to me now that they probably ought to end up going in via different
trees (linux-power-supply vs linux-platform-drivers-x86).

> > 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.
> > 
> > [01/15] ARM: export arm_pm_restart()
> > [02/15] dt-bindings: olpc,xo1.75-ec: Add OLPC XO-1.75 EC bindings
> > [03/15] Platform: OLPC: Remove an unused include
> > [04/15] Platform: OLPC: Add XO-1.75 EC driver
> > [05/15] Platform: OLPC: Avoid a warning if the EC didn't register
> > yet
> > [06/15] Platform: OLPC: Move EC-specific functionality out from x86
> > [07/15] Platform: OLPC: Use BIT() and GENMASK() for event masks
> > [08/15] Platform: OLPC: add a regulator for the DCON
> > [09/15] dt-bindings: olpc_battery: Add XO-1.5 battery
> > [10/15] x86, olpc: Use a correct version when making up a battery
> > node
> > [11/15] power: supply: olpc_battery: Use DT to get battery version
> > [12/15] power: supply: olpc_battery: Move priv data to a struct
> > [13/15] power: supply: olpc_battery: Use
> > devm_power_supply_register()
> > [14/15] power: supply: olpc_battery: Avoid using platform_info
> > [15/15] power: supply: olpc_battery: Add OLPC XO 1.75 support
> > 
> > Lubo
> > 
> > 
> 
> 


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Re: [PATCH v4 00/15] Add support for OLPC XO 1.75 Embedded Controller

[Andy Shevchenko]

On Wed, Jan 9, 2019 at 6:37 PM Lubomir Rintel <lkundrak@v3.sk> wrote:
> On Wed, 2019-01-09 at 13:15 +0200, Andy Shevchenko wrote:
> > On Tue, Jan 8, 2019 at 7:58 PM Lubomir Rintel <lkundrak@v3.sk> wrote:

> > > Also, the 01/15 patch has been added to allow the module to provide
> > > a
> > > reboot handler. Patch 15/15 depends on it.
> >
> > Isn't it a quite big distance between provider and consumer?
> > Especially taking into consideration concerns about patch 1 which
> > blocks the series.
> > Perhaps you may drop it as a patch 1 and do something on top of patch
> > 15 as feature extension?
>
> Yes, that is a good idea. I'll do so when I submit a new version of the
> set (in few days' time).
>
> I think the battery part can be split from the EC part too. Would that
> be a good idea to send them as separate patch sets next time?

Yes, any independent porions can be send independently. It would speed
up the review and applying process.

> It seems
> to me now that they probably ought to end up going in via different
> trees (linux-power-supply vs linux-platform-drivers-x86).

-- 
With Best Regards,
Andy Shevchenko

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