[PATCH v3 0/7] Add support for the iEi Puzzle-M801 board

[PATCH v3 0/7] Add support for the iEi Puzzle-M801 board

[Luka Kovacic]

This patchset adds support for the iEi Puzzle-M801 1U Rackmount Network
Appliance and for the iEi WT61P803 PUZZLE microcontroller, which enables
some board specific features like fan and LED control, system power
management and temperature sensor reading.

The platform is based on the popular Marvell Armada 8040 SoC and supports
up to 16 GB of DDR4 2400 MHz ECC RAM.
It has a PCIe x16 slot (x2 lanes only) and an M.2 type B slot.

External chassis ports:
2x 10 GbE SFP+
4x 1 GbE (Marvell 88E1512P)
2x USB 3.0
1x RJ45 serial port

All notable board components are supported in this patchset.

Changes for v2:
   - Use LAAs for local-mac-address and match reg values
   - Code styling changes
   - Error handling moved to the end of the function
   - Define all magic numbers in the main header file
   - Convert the driver to make it OF independent
   - Refactor hwmon to use devm_hwmon_device_register_with_info()
   - Reduce the number of mutex locks
   - Allocate memory once for the response buffer
   - Reduce managed memory allocations
Changes for v3:
   - Move iei-wt61p803-puzzle driver sysfs interface documentation to testing
   - Change some internal functions to static
   - Sync dt-bindings examples with the iEi Puzzle-M801 board dts
   - Remove obsolete device tree properties and correct LED functions
   - Reverse christmas tree variable declaration order, where possible
   - MAC address sysfs function rewrite
   - Fixed struct members size, where reasonable (MFD driver)
   - Add an error check for hwmon_dev
   - Use devm_led_classdev_register_ext() in the LED driver

Luka Kovacic (7):
  dt-bindings: Add iEi vendor prefix and iEi WT61P803 PUZZLE driver
    bindings
  drivers: mfd: Add a driver for iEi WT61P803 PUZZLE MCU
  drivers: hwmon: Add the iEi WT61P803 PUZZLE HWMON driver
  drivers: leds: Add the iEi WT61P803 PUZZLE LED driver
  Documentation/ABI: Add iei-wt61p803-puzzle driver sysfs interface
    documentation
  MAINTAINERS: Add an entry for the iEi WT61P803 PUZZLE driver
  arm64: dts: marvell: Add a device tree for the iEi Puzzle-M801 board

 .../testing/sysfs-driver-iei-wt61p803-puzzle  |   55 +
 .../hwmon/iei,wt61p803-puzzle-hwmon.yaml      |   41 +
 .../leds/iei,wt61p803-puzzle-leds.yaml        |   45 +
 .../bindings/mfd/iei,wt61p803-puzzle.yaml     |   82 ++
 .../devicetree/bindings/vendor-prefixes.yaml  |    2 +
 MAINTAINERS                                   |   13 +
 arch/arm64/boot/dts/marvell/Makefile          |    1 +
 .../dts/marvell/armada-8040-puzzle-m801.dts   |  524 +++++++++
 drivers/hwmon/Kconfig                         |    8 +
 drivers/hwmon/Makefile                        |    1 +
 drivers/hwmon/iei-wt61p803-puzzle-hwmon.c     |  513 ++++++++
 drivers/leds/Kconfig                          |    8 +
 drivers/leds/Makefile                         |    1 +
 drivers/leds/leds-iei-wt61p803-puzzle.c       |  157 +++
 drivers/mfd/Kconfig                           |    8 +
 drivers/mfd/Makefile                          |    1 +
 drivers/mfd/iei-wt61p803-puzzle.c             | 1045 +++++++++++++++++
 include/linux/mfd/iei-wt61p803-puzzle.h       |   69 ++
 18 files changed, 2574 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-iei-wt61p803-puzzle
 create mode 100644 Documentation/devicetree/bindings/hwmon/iei,wt61p803-puzzle-hwmon.yaml
 create mode 100644 Documentation/devicetree/bindings/leds/iei,wt61p803-puzzle-leds.yaml
 create mode 100644 Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml
 create mode 100644 arch/arm64/boot/dts/marvell/armada-8040-puzzle-m801.dts
 create mode 100644 drivers/hwmon/iei-wt61p803-puzzle-hwmon.c
 create mode 100644 drivers/leds/leds-iei-wt61p803-puzzle.c
 create mode 100644 drivers/mfd/iei-wt61p803-puzzle.c
 create mode 100644 include/linux/mfd/iei-wt61p803-puzzle.h

-- 
2.26.2

[PATCH v3 1/7] dt-bindings: Add iEi vendor prefix and iEi WT61P803 PUZZLE driver bindings

[Luka Kovacic]

Add the iEi WT61P803 PUZZLE Device Tree bindings for MFD, HWMON and LED
drivers. A new vendor prefix is also added accordingly for
IEI Integration Corp.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Robert Marko <robert.marko@sartura.hr>
---
 .../hwmon/iei,wt61p803-puzzle-hwmon.yaml      | 41 ++++++++++
 .../leds/iei,wt61p803-puzzle-leds.yaml        | 45 ++++++++++
 .../bindings/mfd/iei,wt61p803-puzzle.yaml     | 82 +++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
 4 files changed, 170 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/iei,wt61p803-puzzle-hwmon.yaml
 create mode 100644 Documentation/devicetree/bindings/leds/iei,wt61p803-puzzle-leds.yaml
 create mode 100644 Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/iei,wt61p803-puzzle-hwmon.yaml b/Documentation/devicetree/bindings/hwmon/iei,wt61p803-puzzle-hwmon.yaml
new file mode 100644
index 000000000000..37f0030df237
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/iei,wt61p803-puzzle-hwmon.yaml
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/iei,wt61p803-puzzle-hwmon.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: iEi WT61P803 PUZZLE MCU HWMON module from IEI Integration Corp.
+
+maintainers:
+  - Luka Kovacic <luka.kovacic@sartura.hr>
+
+description: |
+  This module is a part of the iEi WT61P803 PUZZLE MFD device. For more details
+  see Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml.
+
+  The HWMON module is a sub-node of the MCU node in the Device Tree.
+
+properties:
+  compatible:
+    const: iei,wt61p803-puzzle-hwmon
+
+patternProperties:
+  "^fan-group@[0-1]$":
+    type: object
+    properties:
+      reg:
+        minimum: 0
+        maximum: 1
+        description:
+          Fan group ID
+      cooling-levels:
+        maxItems: 255
+        description:
+          Cooling levels for the fans (PWM value mapping)
+    description: |
+      Properties for each fan group.
+    required:
+      - reg
+
+required:
+  - compatible
diff --git a/Documentation/devicetree/bindings/leds/iei,wt61p803-puzzle-leds.yaml b/Documentation/devicetree/bindings/leds/iei,wt61p803-puzzle-leds.yaml
new file mode 100644
index 000000000000..0d353e5803bf
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/iei,wt61p803-puzzle-leds.yaml
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/iei,wt61p803-puzzle-leds.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: iEi WT61P803 PUZZLE MCU LED module from IEI Integration Corp.
+
+maintainers:
+  - Luka Kovacic <luka.kovacic@sartura.hr>
+
+description: |
+  This module is a part of the iEi WT61P803 PUZZLE MFD device. For more details
+  see Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml.
+
+  The LED module is a sub-node of the MCU node in the Device Tree.
+
+properties:
+  compatible:
+    const: iei,wt61p803-puzzle-leds
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^led@0$":
+    type: object
+    $ref: common.yaml
+    description: |
+      Properties for a single LED.
+
+    properties:
+      reg:
+        description:
+          Index of the LED. Only one LED is supported at the moment.
+        minimum: 0
+        maximum: 0
+
+required:
+  - compatible
+  - "#address-cells"
+  - "#size-cells"
diff --git a/Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml b/Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml
new file mode 100644
index 000000000000..79a232d75093
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml
@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/iei,wt61p803-puzzle.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: iEi WT61P803 PUZZLE MCU from IEI Integration Corp.
+
+maintainers:
+  - Luka Kovacic <luka.kovacic@sartura.hr>
+
+description: |
+  iEi WT61P803 PUZZLE MCU is embedded in some iEi Puzzle series boards.
+  It's used for controlling system power states, fans, LEDs and temperature
+  sensors.
+
+  For Device Tree bindings of other sub-modules (HWMON, LEDs) refer to the
+  binding documents under the respective subsystem directories.
+
+properties:
+  compatible:
+    const: iei,wt61p803-puzzle
+
+  current-speed:
+    description:
+      Serial bus speed in bps
+    maxItems: 1
+
+  enable-beep: true
+
+  iei-wt61p803-hwmon:
+    $ref: ../hwmon/iei,wt61p803-puzzle-hwmon.yaml
+
+  leds:
+    $ref: ../leds/iei,wt61p803-puzzle-leds.yaml
+
+required:
+  - compatible
+  - current-speed
+
+examples:
+  - |
+    #include <dt-bindings/leds/common.h>
+    serial {
+        status = "okay";
+        mcu {
+            compatible = "iei,wt61p803-puzzle";
+            current-speed = <115200>;
+            enable-beep;
+
+            leds {
+                compatible = "iei,wt61p803-puzzle-leds";
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                led@0 {
+                    reg = <0>;
+                    function = LED_FUNCTION_POWER;
+                    color = <LED_COLOR_ID_BLUE>;
+                };
+            };
+
+            iei-wt61p803-puzzle-hwmon {
+                compatible = "iei,wt61p803-puzzle-hwmon";
+
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                fan-group@0 {
+                    #cooling-cells = <2>;
+                    reg = <0x00>;
+                    cooling-levels = <64 102 170 230 250>;
+                };
+
+                fan-group@1 {
+                    #cooling-cells = <2>;
+                    reg = <0x01>;
+                    cooling-levels = <64 102 170 230 250>;
+                };
+            };
+        };
+    };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 63996ab03521..5f2595f0b2ad 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -467,6 +467,8 @@ patternProperties:
     description: IC Plus Corp.
   "^idt,.*":
     description: Integrated Device Technologies, Inc.
+  "^iei,.*":
+    description: IEI Integration Corp.
   "^ifi,.*":
     description: Ingenieurburo Fur Ic-Technologie (I/F/I)
   "^ilitek,.*":
-- 
2.26.2

[PATCH v3 2/7] drivers: mfd: Add a driver for iEi WT61P803 PUZZLE MCU

[Luka Kovacic]

Add a driver for the iEi WT61P803 PUZZLE microcontroller, used in some
iEi Puzzle series devices. The microcontroller controls system power,
temperature sensors, fans and LEDs.

This driver implements the core functionality for device communication
over the system serial (serdev bus). It handles MCU messages and the
internal MCU properties. Some properties can be managed over sysfs.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Robert Marko <robert.marko@sartura.hr>
---
 drivers/mfd/Kconfig                     |    8 +
 drivers/mfd/Makefile                    |    1 +
 drivers/mfd/iei-wt61p803-puzzle.c       | 1045 +++++++++++++++++++++++
 include/linux/mfd/iei-wt61p803-puzzle.h |   69 ++
 4 files changed, 1123 insertions(+)
 create mode 100644 drivers/mfd/iei-wt61p803-puzzle.c
 create mode 100644 include/linux/mfd/iei-wt61p803-puzzle.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 33df0837ab41..b1588845894e 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -2118,5 +2118,13 @@ config SGI_MFD_IOC3
 	  If you have an SGI Origin, Octane, or a PCI IOC3 card,
 	  then say Y. Otherwise say N.
 
+config MFD_IEI_WT61P803_PUZZLE
+	tristate "iEi WT61P803 PUZZLE MCU driver"
+	depends on SERIAL_DEV_BUS
+	help
+	  iEi WT61P803 PUZZLE is a system power management microcontroller
+	  used for fan control, temperature sensor reading, LED control
+	  and system identification.
+
 endmenu
 endif
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index a60e5f835283..33b88023a68d 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -236,6 +236,7 @@ obj-$(CONFIG_MFD_HI655X_PMIC)   += hi655x-pmic.o
 obj-$(CONFIG_MFD_DLN2)		+= dln2.o
 obj-$(CONFIG_MFD_RT5033)	+= rt5033.o
 obj-$(CONFIG_MFD_SKY81452)	+= sky81452.o
+obj-$(CONFIG_MFD_IEI_WT61P803_PUZZLE)	+= iei-wt61p803-puzzle.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/iei-wt61p803-puzzle.c b/drivers/mfd/iei-wt61p803-puzzle.c
new file mode 100644
index 000000000000..6c5f7588b936
--- /dev/null
+++ b/drivers/mfd/iei-wt61p803-puzzle.c
@@ -0,0 +1,1045 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* iEi WT61P803 PUZZLE MCU Driver
+ * System management microcontroller for fan control, temperature sensor reading,
+ * LED control and system identification on iEi Puzzle series ARM-based appliances.
+ *
+ * Copyright (C) 2020 Sartura Ltd.
+ * Author: Luka Kovacic <luka.kovacic@sartura.hr>
+ */
+
+#include <asm/unaligned.h>
+#include <linux/atomic.h>
+#include <linux/delay.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mfd/iei-wt61p803-puzzle.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/property.h>
+#include <linux/sched.h>
+#include <linux/serdev.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+
+#define IEI_WT61P803_PUZZLE_MAX_COMMAND_LENGTH	(20 + 2)
+#define IEI_WT61P803_PUZZLE_RESP_BUF_SIZE	512
+
+#define IEI_WT61P803_PUZZLE_VERSION_MAC_LENGTH			17
+#define IEI_WT61P803_PUZZLE_VERSION_SN_LENGTH			36
+#define IEI_WT61P803_PUZZLE_VERSION_VERSION_LENGTH		 6
+#define IEI_WT61P803_PUZZLE_VERSION_BUILD_INFO_LENGTH 		16
+#define IEI_WT61P803_PUZZLE_VERSION_PROTOCOL_VERSION_LENGTH	8
+
+/* Use HZ as a timeout value throughout the driver */
+#define IEI_WT61P803_PUZZLE_GENERAL_TIMEOUT HZ
+
+/**
+ * struct iei_wt61p803_puzzle_mcu_status - MCU flags state
+ *
+ * @ac_recovery_status_flag:	AC Recovery Status Flag
+ * @power_loss_recovery:	System recovery after power loss
+ * @power_status:		System Power-on Method
+ */
+struct iei_wt61p803_puzzle_mcu_status {
+	u8 ac_recovery_status_flag;
+	u8 power_loss_recovery;
+	u8 power_status;
+};
+
+/**
+ * enum iei_wt61p803_puzzle_reply_state - State of the reply
+ * @FRAME_OK:		The frame was completely processed/received
+ * @FRAME_PROCESSING:	First bytes were received, but the frame isn't complete
+ * @FRAME_STRUCT_EMPTY:	The frame struct is empty, no data was received
+ * @FRAME_TIMEOUT:	The frame processing timed out, communication failed
+ *
+ * Describes the general state of the frame that is currently being received.
+ */
+enum iei_wt61p803_puzzle_reply_state {
+	FRAME_OK = 0x00,
+	FRAME_PROCESSING = 0x01,
+	FRAME_STRUCT_EMPTY = 0xFF,
+	FRAME_TIMEOUT = 0xFE
+};
+
+/**
+ * struct iei_wt61p803_puzzle_reply - MCU reply
+ *
+ * @size:	Size of the MCU reply
+ * @data:	Full MCU reply buffer
+ * @state:	Current state of the packet
+ * @received:	Was the response fullfilled
+ */
+struct iei_wt61p803_puzzle_reply {
+	size_t size;
+	unsigned char *data;
+	u8 state;
+	struct completion received;
+};
+
+/**
+ * struct iei_wt61p803_puzzle_mcu_version - MCU version status
+ *
+ * @version:		Primary firmware version
+ * @build_info:		Build date and time
+ * @bootloader_mode:	Status of the MCU operation
+ * @protocol_version:	MCU communication protocol version
+ * @serial_number:	Device factory serial number
+ * @mac_address:	Device factory MAC addresses
+ */
+struct iei_wt61p803_puzzle_mcu_version {
+	char version[IEI_WT61P803_PUZZLE_VERSION_VERSION_LENGTH+1];
+	char build_info[IEI_WT61P803_PUZZLE_VERSION_BUILD_INFO_LENGTH+1];
+	bool bootloader_mode;
+	char protocol_version[IEI_WT61P803_PUZZLE_VERSION_PROTOCOL_VERSION_LENGTH+1];
+	char serial_number[IEI_WT61P803_PUZZLE_VERSION_SN_LENGTH+1];
+	char mac_address[8][IEI_WT61P803_PUZZLE_VERSION_MAC_LENGTH+1];
+};
+
+/**
+ * struct iei_wt61p803_puzzle - iEi WT61P803 PUZZLE MCU Driver
+ *
+ * @serdev:		Pointer to underlying serdev device
+ * @kobj:		Pointer to kobject (sysfs)
+ * @reply_lock:		Reply mutex lock
+ * @bus_lock:		Bus mutex lock
+ * @reply:		Pointer to the iei_wt61p803_puzzle_reply struct
+ * @version:		MCU version related data
+ * @status:		MCU status related data
+ * @response_buffer	Command response buffer allocation
+ * @lock		General member mutex lock
+ */
+struct iei_wt61p803_puzzle {
+	struct serdev_device *serdev;
+	struct kobject *kobj;
+	struct mutex reply_lock;
+	struct mutex bus_lock;
+	struct iei_wt61p803_puzzle_reply *reply;
+	struct iei_wt61p803_puzzle_mcu_version version;
+	struct iei_wt61p803_puzzle_mcu_status status;
+	unsigned char *response_buffer;
+	struct mutex lock;
+};
+
+static unsigned char iei_wt61p803_puzzle_checksum(unsigned char *buf, size_t len)
+{
+	unsigned char checksum = 0;
+	unsigned int i;
+
+	for (i = 0; i < len; i++)
+		checksum ^= buf[i];
+
+	return checksum;
+}
+
+static int iei_wt61p803_puzzle_process_resp(struct iei_wt61p803_puzzle *mcu,
+		unsigned char *raw_resp_data, size_t size)
+{
+	struct device *dev = &mcu->serdev->dev;
+	unsigned char checksum;
+
+	mutex_lock(&mcu->reply_lock);
+
+	/* Check the incoming frame header */
+	if (!(raw_resp_data[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START ||
+		raw_resp_data[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER ||
+		(raw_resp_data[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM &&
+		 raw_resp_data[1] == IEI_WT61P803_PUZZLE_CMD_EEPROM_READ))) {
+
+		/* Frame header is not correct, check whether to append */
+		if (mcu->reply->state != FRAME_PROCESSING) {
+			dev_err(dev, "Invalid frame header and state (0x%x)", mcu->reply->state);
+			mutex_unlock(&mcu->reply_lock);
+			return -EIO;
+		}
+
+		/* Append the frame to existing data */
+		memcpy(mcu->reply->data+mcu->reply->size, raw_resp_data, size);
+		mcu->reply->size += size;
+	} else {
+		/* Start processing a new frame */
+		memcpy(mcu->reply->data, raw_resp_data, size);
+		mcu->reply->size = size;
+		mcu->reply->state = FRAME_PROCESSING;
+	}
+
+	checksum = iei_wt61p803_puzzle_checksum(mcu->reply->data, mcu->reply->size-1);
+
+	if (checksum != mcu->reply->data[mcu->reply->size-1]) {
+		/* The checksum isn't matched yet, wait for new frames */
+		mutex_unlock(&mcu->reply_lock);
+		return (int)size;
+	}
+
+	/* Received all the data */
+	mcu->reply->state = FRAME_OK;
+	complete(&mcu->reply->received);
+
+	mutex_unlock(&mcu->reply_lock);
+
+	return (int)size;
+}
+
+static int iei_wt61p803_puzzle_recv_buf(struct serdev_device *serdev,
+		const unsigned char *data, size_t size)
+{
+	struct iei_wt61p803_puzzle *mcu = serdev_device_get_drvdata(serdev);
+	int ret;
+
+	ret = iei_wt61p803_puzzle_process_resp(mcu, (unsigned char *)data, size);
+
+	/* Return the number of processed bytes if function returns error */
+	if (ret < 0)
+		return (int)size;
+
+	return ret;
+}
+
+static const struct serdev_device_ops iei_wt61p803_puzzle_serdev_device_ops = {
+	.receive_buf  = iei_wt61p803_puzzle_recv_buf,
+	.write_wakeup = serdev_device_write_wakeup,
+};
+
+/**
+ * iei_wt61p803_puzzle_write_command_watchdog() - Watchdog of the normal cmd
+ * @mcu: Pointer to the iei_wt61p803_puzzle core MFD struct
+ * @cmd: Pointer to the char array to send (size should be content + 1 (xor))
+ * @size: Size of the cmd char array
+ * @reply_data: Pointer to the reply/response data array (should be allocated)
+ * @reply_size: Pointer to size_t (size of reply_data)
+ * @retry_count: Number of times to retry sending the command to the MCU
+ */
+int iei_wt61p803_puzzle_write_command_watchdog(struct iei_wt61p803_puzzle *mcu,
+		unsigned char *cmd, size_t size, unsigned char *reply_data,
+		size_t *reply_size, int retry_count)
+{
+	struct device *dev = &mcu->serdev->dev;
+	int ret, i;
+
+	for (i = 0; i < retry_count; i++) {
+		ret = iei_wt61p803_puzzle_write_command(mcu, cmd, size,
+				reply_data, reply_size);
+
+		if (ret != -ETIMEDOUT)
+			return ret;
+	}
+
+	dev_err(dev, "%s: Command response timed out. Retries: %d", __func__, retry_count);
+
+	return -ETIMEDOUT;
+}
+EXPORT_SYMBOL_GPL(iei_wt61p803_puzzle_write_command_watchdog);
+
+/**
+ * iei_wt61p803_puzzle_write_command() - Send a structured command to the MCU
+ * @mcu: Pointer to the iei_wt61p803_puzzle core MFD struct
+ * @cmd: Pointer to the char array to send (size should be content + 1 (xor))
+ * @size: Size of the cmd char array
+ * @reply_data: Pointer to the reply/response data array (should be allocated)
+ *
+ * Sends a structured command to the MCU.
+ */
+int iei_wt61p803_puzzle_write_command(struct iei_wt61p803_puzzle *mcu,
+		unsigned char *cmd, size_t size, unsigned char *reply_data,
+		size_t *reply_size)
+{
+	struct device *dev = &mcu->serdev->dev;
+	int ret;
+	int len = (int)size;
+
+	if (size > IEI_WT61P803_PUZZLE_MAX_COMMAND_LENGTH)
+		return -EINVAL;
+
+	cmd[len - 1] = iei_wt61p803_puzzle_checksum(cmd, size);
+
+	mutex_lock(&mcu->bus_lock);
+	mutex_lock(&mcu->reply_lock);
+
+	if (!mcu->reply) {
+		ret = -EFAULT;
+		goto exit;
+	}
+
+	/* Initialize reply struct */
+	reinit_completion(&mcu->reply->received);
+	mcu->reply->state = FRAME_STRUCT_EMPTY;
+	mcu->reply->size = 0;
+	mutex_unlock(&mcu->reply_lock);
+
+	ret = serdev_device_write(mcu->serdev, cmd, len, IEI_WT61P803_PUZZLE_GENERAL_TIMEOUT);
+
+	if (ret < 0) {
+		mutex_unlock(&mcu->bus_lock);
+		return ret;
+	}
+
+	if (!wait_for_completion_timeout(&mcu->reply->received,
+				IEI_WT61P803_PUZZLE_GENERAL_TIMEOUT)) {
+		dev_err(dev, "Command reply receive timeout\n");
+		mutex_lock(&mcu->reply_lock);
+		reinit_completion(&mcu->reply->received);
+		mcu->reply->state = FRAME_TIMEOUT;
+
+		ret = -ETIMEDOUT;
+		goto exit;
+	}
+
+	mutex_lock(&mcu->reply_lock);
+
+	if (!mcu->reply) {
+		ret = -EFAULT;
+		goto exit;
+	}
+
+	*reply_size = mcu->reply->size;
+	/* Copy the received data, as it will not be available after a new frame is received */
+	memcpy(reply_data, mcu->reply->data, mcu->reply->size);
+
+	ret = 0;
+exit:
+	mutex_unlock(&mcu->reply_lock);
+	mutex_unlock(&mcu->bus_lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(iei_wt61p803_puzzle_write_command);
+
+int iei_wt61p803_puzzle_buzzer(struct iei_wt61p803_puzzle *mcu, bool long_beep)
+{
+	unsigned char buzzer_short_cmd[4] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE,
+		'2'
+	}; /* Buzzer 0.5 sec */
+	unsigned char buzzer_long_cmd[4] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE,
+		'3'
+	}; /* Buzzer 1.5 sec */
+	unsigned char *resp_buf = mcu->response_buffer;
+	size_t reply_size = 0;
+	int ret;
+
+	mutex_lock(&mcu->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu,
+			long_beep ? buzzer_long_cmd : buzzer_short_cmd, 4,
+			resp_buf, &reply_size);
+	if (ret)
+		goto exit;
+
+	if (reply_size != 3) {
+		ret = -EIO;
+		goto exit;
+	}
+
+	if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
+		resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
+		resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
+		ret = -EPROTO;
+		goto exit;
+	}
+exit:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_get_version(struct iei_wt61p803_puzzle *mcu)
+{
+	unsigned char version_cmd[3] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_OTHER_VERSION
+	};
+	unsigned char build_info_cmd[3] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_OTHER_BUILD
+	};
+	unsigned char bootloader_mode_cmd[3] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_OTHER_BOOTLOADER_MODE
+	};
+	unsigned char protocol_version_cmd[3] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_OTHER_PROTOCOL_VERSION
+	};
+	unsigned char *rb = mcu->response_buffer;
+	size_t reply_size = 0;
+	int ret;
+
+	mutex_lock(&mcu->lock);
+
+	ret = iei_wt61p803_puzzle_write_command(mcu, version_cmd,
+			sizeof(version_cmd), rb, &reply_size);
+	if (ret)
+		goto err;
+	if (reply_size < 7) {
+		ret = -EIO;
+		goto err;
+	}
+	sprintf(mcu->version.version, "v%c.%c%c%c", rb[2], rb[3], rb[4], rb[5]);
+
+	ret = iei_wt61p803_puzzle_write_command(mcu, build_info_cmd,
+			sizeof(build_info_cmd), rb, &reply_size);
+	if (ret)
+		goto err;
+	if (reply_size < 15) {
+		ret = -EIO;
+		goto err;
+	}
+	sprintf(mcu->version.build_info, "%c%c/%c%c/%c%c%c%c %c%c:%c%c",
+			rb[8], rb[9], rb[6], rb[7], rb[2],
+			rb[3], rb[4], rb[5], rb[10], rb[11],
+			rb[12], rb[13]);
+
+	ret = iei_wt61p803_puzzle_write_command(mcu, bootloader_mode_cmd,
+			sizeof(bootloader_mode_cmd), rb, &reply_size);
+	if (ret)
+		goto err;
+	if (reply_size < 4) {
+		ret = -EIO;
+		goto err;
+	}
+	if (rb[2] == IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_APPS)
+		mcu->version.bootloader_mode = false;
+	else if (rb[2] == IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_BOOTLOADER)
+		mcu->version.bootloader_mode = true;
+
+	ret = iei_wt61p803_puzzle_write_command(mcu, protocol_version_cmd,
+			sizeof(protocol_version_cmd), rb, &reply_size);
+	if (ret)
+		goto err;
+	if (reply_size < 9) {
+		ret = -EIO;
+		goto err;
+	}
+	sprintf(mcu->version.protocol_version, "v%c.%c%c%c%c%c",
+			rb[7], rb[6], rb[5], rb[4], rb[3], rb[2]);
+err:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_get_mcu_status(struct iei_wt61p803_puzzle *mcu)
+{
+	unsigned char mcu_status_cmd[5] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS,
+		IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS
+	};
+	unsigned char *resp_buf = mcu->response_buffer;
+	size_t reply_size = 0;
+	int ret;
+
+	mutex_lock(&mcu->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu, mcu_status_cmd,
+			sizeof(mcu_status_cmd), resp_buf, &reply_size);
+	if (ret)
+		goto exit;
+	if (reply_size < 20) {
+		ret = -EIO;
+		goto exit;
+	}
+
+	/* Response format:
+	 * (IDX	RESPONSE)
+	 * 0	@
+	 * 1	O
+	 * 2	S
+	 * 3	S
+	 * ...
+	 * 5	AC Recovery Status Flag
+	 * ...
+	 * 10	Power Loss Recovery
+	 * ...
+	 * 19	Power Status (system power on method)
+	 * 20	XOR checksum
+	 */
+	if (resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
+			resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER &&
+			resp_buf[2] == IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS &&
+			resp_buf[3] == IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS) {
+		mcu->status.ac_recovery_status_flag = resp_buf[5];
+		mcu->status.power_loss_recovery = resp_buf[10];
+		mcu->status.power_status = resp_buf[19];
+	}
+exit:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_get_serial_number(struct iei_wt61p803_puzzle *mcu)
+{
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char serial_number_cmd[5] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
+		IEI_WT61P803_PUZZLE_CMD_EEPROM_READ,
+		0x00,
+		0x24
+	};
+	size_t reply_size = 0;
+	int ret;
+
+	mutex_lock(&mcu->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu, serial_number_cmd,
+			sizeof(serial_number_cmd), resp_buf, &reply_size);
+	if (ret)
+		goto err;
+
+	sprintf(mcu->version.serial_number, "%.*s",
+			IEI_WT61P803_PUZZLE_VERSION_SN_LENGTH, resp_buf + 4);
+err:
+	mutex_unlock(&mcu->lock);
+	return ret;
+
+}
+
+static int iei_wt61p803_puzzle_write_serial_number(struct iei_wt61p803_puzzle *mcu,
+		unsigned char serial_number[36])
+{
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char serial_number_header[4] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
+		IEI_WT61P803_PUZZLE_CMD_EEPROM_WRITE,
+		0x00,
+		0xC
+	};
+	unsigned char serial_number_cmd[4+12+1]; /* header, serial number chunk, XOR checksum */
+	size_t reply_size = 0;
+	int ret, sn_counter;
+
+	/* The MCU can only handle 22 byte messages, send the S/N in chunks */
+	mutex_lock(&mcu->lock);
+	for (sn_counter = 0; sn_counter < 3; sn_counter++) {
+		serial_number_header[2] = 0x0 + (0xC) * sn_counter;
+
+		memcpy(serial_number_cmd, serial_number_header, 4);
+		memcpy(serial_number_cmd + 4, serial_number + (0xC) * sn_counter, 0xC);
+
+		serial_number_cmd[sizeof(serial_number_cmd) - 1] = 0;
+
+		ret = iei_wt61p803_puzzle_write_command(mcu, serial_number_cmd,
+				sizeof(serial_number_cmd), resp_buf, &reply_size);
+		if (ret)
+			goto err;
+		if (reply_size != 3) {
+			ret = -EIO;
+			goto err;
+		}
+		if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
+				resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
+				resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
+			ret = -EPROTO;
+			goto err;
+		}
+	}
+
+	sprintf(mcu->version.serial_number, "%.*s",
+			IEI_WT61P803_PUZZLE_VERSION_SN_LENGTH, serial_number);
+err:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_get_mac_addresses(struct iei_wt61p803_puzzle *mcu)
+{
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char mac_address_cmd[5] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
+		IEI_WT61P803_PUZZLE_CMD_EEPROM_READ,
+		0x00,
+		0x11
+	};
+	size_t reply_size = 0;
+	int ret, mac_counter;
+
+	mutex_lock(&mcu->lock);
+	for (mac_counter = 0; mac_counter < 8; mac_counter++) {
+		mac_address_cmd[2] = 0x24 + (0x11) * mac_counter;
+		mac_address_cmd[4] = 0x00;
+
+		ret = iei_wt61p803_puzzle_write_command(mcu, mac_address_cmd,
+				sizeof(mac_address_cmd), resp_buf, &reply_size);
+		if (ret)
+			continue;
+
+		if (reply_size < 22) {
+			ret = -EIO;
+			goto err;
+		}
+
+		sprintf(mcu->version.mac_address[mac_counter], "%.*s",
+				IEI_WT61P803_PUZZLE_VERSION_MAC_LENGTH, resp_buf + 4);
+	}
+err:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_write_mac_address(struct iei_wt61p803_puzzle *mcu,
+		unsigned char mac_address[17], int mac_address_idx)
+{
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char mac_address_header[4] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
+		IEI_WT61P803_PUZZLE_CMD_EEPROM_WRITE,
+		0x00,
+		0x11
+	};
+	unsigned char mac_address_cmd[4+17+1]; /* header, MAC address, XOR checksum*/
+	size_t reply_size = 0;
+	int ret;
+
+	if (!(mac_address_idx < 8))
+		return -EINVAL;
+
+	mac_address_header[2] = 0x24 + (0x11) * mac_address_idx;
+
+	/* Concat mac_address_header, mac_address to mac_address_cmd */
+	memcpy(mac_address_cmd, mac_address_header, 4);
+	memcpy(mac_address_cmd + 4, mac_address, 17);
+
+	mac_address_cmd[sizeof(mac_address_cmd) - 1] = 0;
+
+	mutex_lock(&mcu->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu, mac_address_cmd,
+			sizeof(mac_address_cmd), resp_buf, &reply_size);
+	if (ret)
+		goto err;
+	if (reply_size != 3) {
+		ret = -EIO;
+		goto err;
+	}
+	if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
+				resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
+				resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
+		ret = -EPROTO;
+		goto err;
+	}
+
+	sprintf(mcu->version.mac_address[mac_address_idx], "%.*s",
+			IEI_WT61P803_PUZZLE_VERSION_MAC_LENGTH, mac_address);
+err:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_write_power_loss_recovery(struct iei_wt61p803_puzzle *mcu,
+		int power_loss_recovery_action)
+{
+	unsigned char power_loss_recovery_cmd[5] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_POWER_LOSS,
+		'0'
+	};
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char cmd_buf[2];
+	size_t reply_size = 0;
+	int ret;
+
+	if (power_loss_recovery_action < 0 || power_loss_recovery_action > 4)
+		return -EINVAL;
+
+	ret = snprintf(cmd_buf, sizeof(cmd_buf), "%d", power_loss_recovery_action);
+	if (ret < 0)
+		return ret;
+
+	/* Modify the command with the action index */
+	power_loss_recovery_cmd[3] = cmd_buf[0];
+
+	mutex_lock(&mcu->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu, power_loss_recovery_cmd,
+			sizeof(power_loss_recovery_cmd), resp_buf, &reply_size);
+	if (ret)
+		goto exit;
+	mcu->status.power_loss_recovery = power_loss_recovery_action;
+exit:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+#define sysfs_container(dev) \
+	(container_of((dev)->kobj.parent, struct device, kobj))
+
+static ssize_t version_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+
+	return sprintf(buf, "%s\n", mcu->version.version);
+}
+static DEVICE_ATTR_RO(version);
+
+static ssize_t build_info_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+
+	return sprintf(buf, "%s\n", mcu->version.build_info);
+}
+static DEVICE_ATTR_RO(build_info);
+
+static ssize_t bootloader_mode_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+
+	return sprintf(buf, "%d\n", mcu->version.bootloader_mode);
+}
+static DEVICE_ATTR_RO(bootloader_mode);
+
+static ssize_t protocol_version_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+
+	return sprintf(buf, "%s\n", mcu->version.protocol_version);
+}
+static DEVICE_ATTR_RO(protocol_version);
+
+static ssize_t serial_number_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+	int ret;
+
+	mutex_lock(&mcu->lock);
+	ret = sprintf(buf, "%s\n", mcu->version.serial_number);
+	mutex_unlock(&mcu->lock);
+
+	return ret;
+}
+static ssize_t serial_number_store(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	unsigned char serial_number[IEI_WT61P803_PUZZLE_VERSION_SN_LENGTH];
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+	int ret;
+
+	if ((int)count != IEI_WT61P803_PUZZLE_VERSION_SN_LENGTH + 1)
+		return -EINVAL;
+
+	memcpy(serial_number, (unsigned char *)buf, IEI_WT61P803_PUZZLE_VERSION_SN_LENGTH);
+
+	ret = iei_wt61p803_puzzle_write_serial_number(mcu, serial_number);
+	if (ret)
+		return ret;
+
+	return count;
+}
+static DEVICE_ATTR_RW(serial_number);
+
+static ssize_t mac_address_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+	int idx, ret;
+
+	mutex_lock(&mcu->lock);
+
+	if (strlen(attr->attr.name) != 13)
+		return -EIO;
+
+	idx = attr->attr.name[12] - '0';
+	if (idx < 0 || idx > 7)
+		return -EIO;
+
+	ret = sprintf(buf, "%s\n", mcu->version.mac_address[idx]);
+
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+static ssize_t mac_address_store(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	unsigned char mac_address[IEI_WT61P803_PUZZLE_VERSION_MAC_LENGTH];
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+	int idx, ret;
+
+	if ((int)count != 17 + 1)
+		return -EINVAL;
+
+	memcpy(mac_address, (unsigned char *)buf, IEI_WT61P803_PUZZLE_VERSION_MAC_LENGTH);
+
+	if (strlen(attr->attr.name) != 13)
+		return -EIO;
+
+	idx = attr->attr.name[12] - '0';
+	if (idx < 0 || idx > 7)
+		return -EIO;
+
+	ret = iei_wt61p803_puzzle_write_mac_address(mcu, mac_address, idx);
+	if (ret)
+		return ret;
+
+	return count;
+}
+static DEVICE_ATTR(mac_address_0, 0644, mac_address_show, mac_address_store);
+static DEVICE_ATTR(mac_address_1, 0644, mac_address_show, mac_address_store);
+static DEVICE_ATTR(mac_address_2, 0644, mac_address_show, mac_address_store);
+static DEVICE_ATTR(mac_address_3, 0644, mac_address_show, mac_address_store);
+static DEVICE_ATTR(mac_address_4, 0644, mac_address_show, mac_address_store);
+static DEVICE_ATTR(mac_address_5, 0644, mac_address_show, mac_address_store);
+static DEVICE_ATTR(mac_address_6, 0644, mac_address_show, mac_address_store);
+static DEVICE_ATTR(mac_address_7, 0644, mac_address_show, mac_address_store);
+
+static ssize_t ac_recovery_status_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+
+	int ret;
+
+	ret = iei_wt61p803_puzzle_get_mcu_status(mcu);
+	if (ret)
+		return ret;
+
+	mutex_lock(&mcu->lock);
+	ret = sprintf(buf, "%x\n", mcu->status.ac_recovery_status_flag);
+	mutex_unlock(&mcu->lock);
+
+	return ret;
+}
+static DEVICE_ATTR_RO(ac_recovery_status);
+
+static ssize_t power_loss_recovery_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+
+	int ret;
+
+	ret = iei_wt61p803_puzzle_get_mcu_status(mcu);
+	if (ret)
+		return ret;
+
+	mutex_lock(&mcu->lock);
+	ret = sprintf(buf, "%x\n", mcu->status.power_loss_recovery);
+	mutex_unlock(&mcu->lock);
+
+	return ret;
+}
+static ssize_t power_loss_recovery_store(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+
+	int ret;
+	long power_loss_recovery_action = 0;
+
+	ret = kstrtol(buf, 10, &power_loss_recovery_action);
+	if (ret)
+		return ret;
+
+	ret = iei_wt61p803_puzzle_write_power_loss_recovery(mcu,
+			(int)power_loss_recovery_action);
+	if (ret)
+		return ret;
+
+	return count;
+}
+static DEVICE_ATTR_RW(power_loss_recovery);
+
+static ssize_t power_status_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct device *dev_container = sysfs_container(dev);
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
+
+	int ret;
+
+	ret = iei_wt61p803_puzzle_get_mcu_status(mcu);
+	if (ret)
+		return ret;
+
+	mutex_lock(&mcu->lock);
+	ret = sprintf(buf, "%x\n", mcu->status.power_status);
+	mutex_unlock(&mcu->lock);
+
+	return ret;
+}
+static DEVICE_ATTR_RO(power_status);
+
+static struct attribute *iei_wt61p803_puzzle_attrs[] = {
+	&dev_attr_version.attr,
+	&dev_attr_build_info.attr,
+	&dev_attr_bootloader_mode.attr,
+	&dev_attr_protocol_version.attr,
+	&dev_attr_serial_number.attr,
+	&dev_attr_mac_address_0.attr,
+	&dev_attr_mac_address_1.attr,
+	&dev_attr_mac_address_2.attr,
+	&dev_attr_mac_address_3.attr,
+	&dev_attr_mac_address_4.attr,
+	&dev_attr_mac_address_5.attr,
+	&dev_attr_mac_address_6.attr,
+	&dev_attr_mac_address_7.attr,
+	&dev_attr_ac_recovery_status.attr,
+	&dev_attr_power_loss_recovery.attr,
+	&dev_attr_power_status.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(iei_wt61p803_puzzle);
+
+static int iei_wt61p803_puzzle_sysfs_create(struct device *dev,
+		struct iei_wt61p803_puzzle *mcu)
+{
+	int ret;
+
+	mcu->kobj = kobject_create_and_add("iei_wt61p803_puzzle_core", &dev->kobj);
+	if (!mcu->kobj)
+		return -ENOMEM;
+
+	ret = sysfs_create_groups(mcu->kobj, iei_wt61p803_puzzle_groups);
+	if (ret) {
+		kobject_del(mcu->kobj);
+		kobject_put(mcu->kobj);
+		mcu->kobj = NULL;
+	}
+
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_sysfs_remove(struct device *dev,
+		struct iei_wt61p803_puzzle *mcu)
+{
+	/* Remove sysfs groups */
+	sysfs_remove_groups(mcu->kobj, iei_wt61p803_puzzle_groups);
+
+	/* Remove the kobject */
+	kobject_del(mcu->kobj);
+	kobject_put(mcu->kobj);
+	mcu->kobj = NULL;
+
+	return 0;
+}
+
+static int iei_wt61p803_puzzle_probe(struct serdev_device *serdev)
+{
+	struct device *dev = &serdev->dev;
+	struct iei_wt61p803_puzzle *mcu;
+	u32 baud;
+	int ret;
+
+	/* Read the baud rate from 'current-speed', because the MCU supports different rates */
+	if (device_property_read_u32(dev, "current-speed", &baud)) {
+		dev_err(dev,
+			"'current-speed' is not specified in device node\n");
+		return -EINVAL;
+	}
+	dev_info(dev, "Driver baud rate: %d", baud);
+
+	/* Allocate the memory */
+	mcu = devm_kzalloc(dev, sizeof(*mcu), GFP_KERNEL);
+	if (!mcu)
+		return -ENOMEM;
+
+	mcu->reply = devm_kzalloc(dev, sizeof(*mcu->reply), GFP_KERNEL);
+	if (!mcu->reply)
+		return -ENOMEM;
+
+	mcu->reply->data = devm_kzalloc(dev, IEI_WT61P803_PUZZLE_RESP_BUF_SIZE,
+			GFP_KERNEL);
+	if (!mcu->reply->data)
+		return -ENOMEM;
+
+	mcu->response_buffer = devm_kzalloc(dev, IEI_WT61P803_PUZZLE_BUF_SIZE,
+			GFP_KERNEL);
+	if (!mcu->response_buffer)
+		return -ENOMEM;
+
+	/* Initialize device struct data */
+	mcu->serdev = serdev;
+	init_completion(&mcu->reply->received);
+	mutex_init(&mcu->reply_lock);
+	mutex_init(&mcu->bus_lock);
+	mutex_init(&mcu->lock);
+
+	/* Setup UART interface */
+	serdev_device_set_drvdata(serdev, mcu);
+	serdev_device_set_client_ops(serdev, &iei_wt61p803_puzzle_serdev_device_ops);
+	ret = devm_serdev_device_open(dev, serdev);
+	if (ret)
+		return ret;
+	serdev_device_set_baudrate(serdev, baud);
+	serdev_device_set_flow_control(serdev, false);
+	ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE);
+	if (ret) {
+		dev_err(dev, "Failed to set parity");
+		return ret;
+	}
+
+	ret = iei_wt61p803_puzzle_get_version(mcu);
+	if (ret)
+		return ret;
+
+	ret = iei_wt61p803_puzzle_get_mac_addresses(mcu);
+	if (ret)
+		return ret;
+
+	ret = iei_wt61p803_puzzle_get_serial_number(mcu);
+	if (ret)
+		return ret;
+
+	dev_info(dev, "MCU version: %s", mcu->version.version);
+	dev_info(dev, "MCU firmware build info: %s", mcu->version.build_info);
+	dev_info(dev, "MCU in bootloader mode: %s",
+			mcu->version.bootloader_mode ? "true" : "false");
+	dev_info(dev, "MCU protocol version: %s", mcu->version.protocol_version);
+
+	if (device_property_read_bool(dev, "enable-beep")) {
+		ret = iei_wt61p803_puzzle_buzzer(mcu, false);
+		if (ret)
+			return ret;
+	}
+
+	ret = iei_wt61p803_puzzle_sysfs_create(dev, mcu);
+
+	return devm_of_platform_populate(dev);
+}
+
+static void iei_wt61p803_puzzle_remove(struct serdev_device *serdev)
+{
+	struct device *dev = &serdev->dev;
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev);
+
+	iei_wt61p803_puzzle_sysfs_remove(dev, mcu);
+}
+
+static const struct of_device_id iei_wt61p803_puzzle_dt_ids[] = {
+	{ .compatible = "iei,wt61p803-puzzle" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, iei_wt61p803_puzzle_dt_ids);
+
+static struct serdev_device_driver iei_wt61p803_puzzle_drv = {
+	.probe			= iei_wt61p803_puzzle_probe,
+	.remove			= iei_wt61p803_puzzle_remove,
+	.driver = {
+		.name		= "iei-wt61p803-puzzle",
+		.of_match_table	= iei_wt61p803_puzzle_dt_ids,
+	},
+};
+
+module_serdev_device_driver(iei_wt61p803_puzzle_drv);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Luka Kovacic <luka.kovacic@sartura.hr>");
+MODULE_DESCRIPTION("iEi WT61P803 PUZZLE MCU Driver");
diff --git a/include/linux/mfd/iei-wt61p803-puzzle.h b/include/linux/mfd/iei-wt61p803-puzzle.h
new file mode 100644
index 000000000000..633ceb1d00e3
--- /dev/null
+++ b/include/linux/mfd/iei-wt61p803-puzzle.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* iEi WT61P803 PUZZLE MCU Driver
+ * System management microcontroller for fan control, temperature sensor reading,
+ * LED control and system identification on iEi Puzzle series ARM-based appliances.
+ *
+ * Copyright (C) 2020 Sartura Ltd.
+ * Author: Luka Kovacic <luka.kovacic@sartura.hr>
+ */
+
+#ifndef _MFD_IEI_WT61P803_PUZZLE_H_
+#define _MFD_IEI_WT61P803_PUZZLE_H_
+
+#define IEI_WT61P803_PUZZLE_BUF_SIZE 512
+
+/* Command magic numbers */
+#define IEI_WT61P803_PUZZLE_CMD_HEADER_START		0x40 /* @ */
+#define IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER	0x25 /* % */
+#define IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM		0xF7
+
+#define IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK		0x30 /* 0 */
+#define IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK	0x70
+
+#define IEI_WT61P803_PUZZLE_CMD_EEPROM_READ		0xA1
+#define IEI_WT61P803_PUZZLE_CMD_EEPROM_WRITE		0xA0
+
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_VERSION		0x56 /* V */
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_BUILD		0x42 /* B */
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_BOOTLOADER_MODE	0x4D /* M */
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_BOOTLOADER	0x30
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_APPS		0x31
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_PROTOCOL_VERSION	0x50 /* P */
+
+#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE		0x43 /* C */
+#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER		0x4F /* O */
+#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS	0x53 /* S */
+#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_POWER_LOSS 0x41 /* A */
+
+#define IEI_WT61P803_PUZZLE_CMD_LED			0x52 /* R */
+#define IEI_WT61P803_PUZZLE_CMD_LED_POWER		0x31 /* 1 */
+
+#define IEI_WT61P803_PUZZLE_CMD_TEMP			0x54 /* T */
+#define IEI_WT61P803_PUZZLE_CMD_TEMP_ALL		0x41 /* A */
+
+#define IEI_WT61P803_PUZZLE_CMD_FAN			0x46 /* F */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_0		0x30
+#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_1		0x31
+#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_READ		0x5A /* Z */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_WRITE		0x57 /* W */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_0		0x41 /* A */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_1		0x42 /* B */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_2		0x43 /* C */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_3		0x44 /* D */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_4		0x45 /* E */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_5		0x46 /* F */
+
+struct iei_wt61p803_puzzle_mcu_version;
+struct iei_wt61p803_puzzle_reply;
+struct iei_wt61p803_puzzle;
+
+int iei_wt61p803_puzzle_write_command_watchdog(struct iei_wt61p803_puzzle *mcu,
+		unsigned char *cmd, size_t size,
+		unsigned char *reply_data, size_t *reply_size,
+		int retry_count);
+
+int iei_wt61p803_puzzle_write_command(struct iei_wt61p803_puzzle *mcu,
+		unsigned char *cmd, size_t size,
+		unsigned char *reply_data, size_t *reply_size);
+
+#endif /* _MFD_IEI_WT61P803_PUZZLE_H_ */
-- 
2.26.2

[PATCH v3 3/7] drivers: hwmon: Add the iEi WT61P803 PUZZLE HWMON driver

[Luka Kovacic]

Add the iEi WT61P803 PUZZLE HWMON driver, that handles the fan speed
control via PWM, reading fan speed and reading on-board temperature
sensors.

The driver registers a HWMON device and a simple thermal cooling device to
enable in-kernel fan management.

This driver depends on the iEi WT61P803 PUZZLE MFD driver.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Robert Marko <robert.marko@sartura.hr>
---
 drivers/hwmon/Kconfig                     |   8 +
 drivers/hwmon/Makefile                    |   1 +
 drivers/hwmon/iei-wt61p803-puzzle-hwmon.c | 513 ++++++++++++++++++++++
 3 files changed, 522 insertions(+)
 create mode 100644 drivers/hwmon/iei-wt61p803-puzzle-hwmon.c

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 8dc28b26916e..ff279df9bf40 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -722,6 +722,14 @@ config SENSORS_IBMPOWERNV
 	  This driver can also be built as a module. If so, the module
 	  will be called ibmpowernv.
 
+config SENSORS_IEI_WT61P803_PUZZLE_HWMON
+	tristate "iEi WT61P803 PUZZLE MFD HWMON Driver"
+	depends on MFD_IEI_WT61P803_PUZZLE
+	help
+	  The iEi WT61P803 PUZZLE MFD HWMON Driver handles reading fan speed
+	  and writing fan PWM values. It also supports reading on-board
+	  temperature sensors.
+
 config SENSORS_IIO_HWMON
 	tristate "Hwmon driver that uses channels specified via iio maps"
 	depends on IIO
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index a8f4b35b136b..b0afb2d6896f 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -83,6 +83,7 @@ obj-$(CONFIG_SENSORS_HIH6130)	+= hih6130.o
 obj-$(CONFIG_SENSORS_ULTRA45)	+= ultra45_env.o
 obj-$(CONFIG_SENSORS_I5500)	+= i5500_temp.o
 obj-$(CONFIG_SENSORS_I5K_AMB)	+= i5k_amb.o
+obj-$(CONFIG_SENSORS_IEI_WT61P803_PUZZLE_HWMON) += iei-wt61p803-puzzle-hwmon.o
 obj-$(CONFIG_SENSORS_IBMAEM)	+= ibmaem.o
 obj-$(CONFIG_SENSORS_IBMPEX)	+= ibmpex.o
 obj-$(CONFIG_SENSORS_IBMPOWERNV)+= ibmpowernv.o
diff --git a/drivers/hwmon/iei-wt61p803-puzzle-hwmon.c b/drivers/hwmon/iei-wt61p803-puzzle-hwmon.c
new file mode 100644
index 000000000000..990016329578
--- /dev/null
+++ b/drivers/hwmon/iei-wt61p803-puzzle-hwmon.c
@@ -0,0 +1,513 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* iEi WT61P803 PUZZLE MCU HWMON Driver
+ *
+ * Copyright (C) 2020 Sartura Ltd.
+ * Author: Luka Kovacic <luka.kovacic@sartura.hr>
+ */
+
+#include <linux/err.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/math64.h>
+#include <linux/mfd/iei-wt61p803-puzzle.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+#include <linux/thermal.h>
+
+#define IEI_WT61P803_PUZZLE_HWMON_MAX_TEMP_NUM 2
+#define IEI_WT61P803_PUZZLE_HWMON_MAX_FAN_NUM 5
+#define IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_NUM 2
+#define IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_VAL 255
+
+/**
+ * struct iei_wt61p803_puzzle_thermal_cooling_device - Thermal cooling device instance
+ *
+ * @mcu_hwmon:		MCU HWMON struct pointer
+ * @tcdev:		Thermal cooling device pointer
+ * @name:		Thermal cooling device name
+ * @pwm_channel:	PWM channel (0 or 1)
+ * @cooling_levels:	Thermal cooling device cooling levels
+ */
+struct iei_wt61p803_puzzle_thermal_cooling_device {
+	struct iei_wt61p803_puzzle_hwmon *mcu_hwmon;
+	struct thermal_cooling_device *tcdev;
+	char name[THERMAL_NAME_LENGTH];
+	int pwm_channel;
+	u8 *cooling_levels;
+};
+
+/**
+ * struct iei_wt61p803_puzzle_hwmon - MCU HWMON Driver
+ *
+ * @mcu:				MCU struct pointer
+ * @lock				General member lock
+ * @response_buffer			Global MCU response buffer allocation
+ * @temp_sensor_val:			Temperature sensor values
+ * @fan_speed_val:			FAN speed (RPM) values
+ * @pwm_val:				PWM values (0-255)
+ * @thermal_cooling_dev_present:	Per-channel thermal cooling device control
+ * @cdev:				Per-channel thermal cooling device private structure
+ */
+struct iei_wt61p803_puzzle_hwmon {
+	struct iei_wt61p803_puzzle *mcu;
+	struct mutex lock;
+	unsigned char *response_buffer;
+	int temp_sensor_val[IEI_WT61P803_PUZZLE_HWMON_MAX_TEMP_NUM];
+	int fan_speed_val[IEI_WT61P803_PUZZLE_HWMON_MAX_FAN_NUM];
+	int pwm_val[IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_NUM];
+	bool thermal_cooling_dev_present[IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_NUM];
+	struct iei_wt61p803_puzzle_thermal_cooling_device
+		*cdev[IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_NUM];
+};
+
+#define raw_temp_to_milidegree_celsius(x) ((int)((x - 0x80)*1000))
+static int iei_wt61p803_puzzle_read_temp_sensor
+(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, int channel, int *value)
+{
+	unsigned char *resp_buf = mcu_hwmon->response_buffer;
+	unsigned char temp_sensor_ntc_cmd[4] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_TEMP,
+		IEI_WT61P803_PUZZLE_CMD_TEMP_ALL
+	};
+	size_t reply_size = 0;
+	int ret;
+
+	if (channel > 1 && channel < 0)
+		return -EINVAL;
+
+	mutex_lock(&mcu_hwmon->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu_hwmon->mcu,
+			temp_sensor_ntc_cmd, sizeof(temp_sensor_ntc_cmd),
+			resp_buf, &reply_size);
+	if (!ret) {
+		/* Check the number of NTC values (should be 0x32/'2') */
+		if (resp_buf[3] == 0x32) {
+			/* Write values to the struct */
+			mcu_hwmon->temp_sensor_val[0] =
+				raw_temp_to_milidegree_celsius(resp_buf[4]);
+			mcu_hwmon->temp_sensor_val[1] =
+				raw_temp_to_milidegree_celsius(resp_buf[5]);
+		}
+
+	}
+	*value = mcu_hwmon->temp_sensor_val[channel];
+	mutex_unlock(&mcu_hwmon->lock);
+
+	return ret;
+}
+
+#define raw_fan_val_to_rpm(x, y) ((int)(((x)<<8|(y))/2)*60)
+static int iei_wt61p803_puzzle_read_fan_speed
+(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, int channel, int *value)
+{
+	unsigned char *resp_buf = mcu_hwmon->response_buffer;
+	unsigned char fan_speed_cmd[4] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_FAN,
+		IEI_WT61P803_PUZZLE_CMD_FAN_RPM_0
+	};
+	size_t reply_size = 0;
+	int ret;
+
+	switch (channel) {
+	case 0:
+		fan_speed_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_RPM_0;
+		break;
+	case 1:
+		fan_speed_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_RPM_1;
+		break;
+	case 2:
+		fan_speed_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_RPM_2;
+		break;
+	case 3:
+		fan_speed_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_RPM_3;
+		break;
+	case 4:
+		fan_speed_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FAN_RPM_4;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	mutex_lock(&mcu_hwmon->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu_hwmon->mcu, fan_speed_cmd,
+			sizeof(fan_speed_cmd), resp_buf, &reply_size);
+	if (!ret)
+		mcu_hwmon->fan_speed_val[channel] = raw_fan_val_to_rpm(resp_buf[3],
+				resp_buf[4]);
+
+	*value = mcu_hwmon->fan_speed_val[channel];
+	mutex_unlock(&mcu_hwmon->lock);
+
+	return 0;
+}
+
+static int iei_wt61p803_puzzle_write_pwm_channel
+(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, int channel, long pwm_set_val)
+{
+	unsigned char *resp_buf = mcu_hwmon->response_buffer;
+	unsigned char pwm_set_cmd[6] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_FAN,
+		IEI_WT61P803_PUZZLE_CMD_FAN_PWM_WRITE,
+		IEI_WT61P803_PUZZLE_CMD_FAN_PWM_0,
+		0x00
+	};
+	size_t reply_size = 0;
+	int ret;
+
+	switch (channel) {
+	case 0:
+		pwm_set_cmd[3] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM_0;
+		break;
+	case 1:
+		pwm_set_cmd[3] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM_1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (pwm_set_val < 0 || pwm_set_val > IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_VAL)
+		return -EINVAL;
+
+	/* Add the PWM value to the command */
+	pwm_set_cmd[4] = (char)pwm_set_val;
+
+	mutex_lock(&mcu_hwmon->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu_hwmon->mcu, pwm_set_cmd,
+			sizeof(pwm_set_cmd), resp_buf, &reply_size);
+	if (!ret) {
+		/* Store the PWM value */
+		if (resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
+				resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
+				resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)
+			mcu_hwmon->pwm_val[channel] = (int)pwm_set_val;
+	}
+	mutex_unlock(&mcu_hwmon->lock);
+
+	return 0;
+}
+
+static int iei_wt61p803_puzzle_read_pwm_channel
+(struct iei_wt61p803_puzzle_hwmon *mcu_hwmon, int channel, int *value)
+{
+	unsigned char *resp_buf = mcu_hwmon->response_buffer;
+	unsigned char pwm_get_cmd[5] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_FAN,
+		IEI_WT61P803_PUZZLE_CMD_FAN_PWM_READ,
+		IEI_WT61P803_PUZZLE_CMD_FAN_PWM_0
+	};
+	size_t reply_size = 0;
+	int ret;
+
+	switch (channel) {
+	case 0:
+		pwm_get_cmd[3] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM_0;
+		break;
+	case 1:
+		pwm_get_cmd[3] = IEI_WT61P803_PUZZLE_CMD_FAN_PWM_1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	mutex_lock(&mcu_hwmon->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu_hwmon->mcu, pwm_get_cmd,
+			sizeof(pwm_get_cmd), resp_buf, &reply_size);
+	if (!ret) {
+		/* Store the PWM value */
+		if (resp_buf[2] == IEI_WT61P803_PUZZLE_CMD_FAN_PWM_READ)
+			mcu_hwmon->pwm_val[channel] = (int)resp_buf[3];
+	}
+	*value = mcu_hwmon->pwm_val[channel];
+	mutex_unlock(&mcu_hwmon->lock);
+
+	return 0;
+}
+
+static int iei_wt61p803_puzzle_read(struct device *dev, enum hwmon_sensor_types type,
+		u32 attr, int channel, long *val)
+{
+	struct iei_wt61p803_puzzle_hwmon *mcu_hwmon =
+		dev_get_drvdata(dev->parent);
+	int ret, value;
+
+	switch (type) {
+	case hwmon_pwm:
+		if (attr != hwmon_pwm_input)
+			return -ENODEV;
+		ret = iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon, channel, &value);
+		if (ret)
+			return ret;
+		*val = (long)value;
+		return ret;
+	case hwmon_fan:
+		if (attr != hwmon_fan_input)
+			return -ENODEV;
+		ret = iei_wt61p803_puzzle_read_fan_speed(mcu_hwmon, channel, &value);
+		if (ret)
+			return ret;
+		*val = (long)value;
+		return ret;
+	case hwmon_temp:
+		if (attr != hwmon_temp_input)
+			return -ENODEV;
+		ret = iei_wt61p803_puzzle_read_temp_sensor(mcu_hwmon, channel, &value);
+		if (ret)
+			return ret;
+		*val = (long)value;
+		return ret;
+	default:
+		return -ENODEV;
+	}
+}
+
+static int iei_wt61p803_puzzle_write(struct device *dev, enum hwmon_sensor_types type,
+		u32 attr, int channel, long val)
+{
+	struct iei_wt61p803_puzzle_hwmon *mcu_hwmon =
+		dev_get_drvdata(dev->parent);
+
+	switch (type) {
+	case hwmon_pwm:
+		if (attr != hwmon_pwm_input)
+			return -ENODEV;
+		if (mcu_hwmon->thermal_cooling_dev_present[channel]) {
+			/*
+			 * The Thermal Framework has already claimed this specific PWM
+			 * channel.
+			 */
+			return -EBUSY;
+		}
+		return iei_wt61p803_puzzle_write_pwm_channel(mcu_hwmon, channel, val);
+	default:
+		return -ENODEV;
+	}
+}
+
+static umode_t iei_wt61p803_puzzle_is_visible(const void *data,
+		enum hwmon_sensor_types type, u32 attr, int channel)
+{
+	const struct iei_wt61p803_puzzle_hwmon *mcu_hwmon = data;
+
+	switch (type) {
+	case hwmon_pwm:
+		switch (attr) {
+		case hwmon_pwm_input:
+			if (mcu_hwmon->thermal_cooling_dev_present[channel])
+				return 0444;
+			return 0644;
+		default:
+			return 0;
+		}
+	case hwmon_fan:
+		switch (attr) {
+		case hwmon_fan_input:
+			return 0444;
+		default:
+			return 0;
+		}
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+			return 0444;
+		default:
+			return 0;
+		}
+	default:
+		return 0;
+	}
+}
+
+static const struct hwmon_ops iei_wt61p803_puzzle_hwmon_ops = {
+	.is_visible = iei_wt61p803_puzzle_is_visible,
+	.read = iei_wt61p803_puzzle_read,
+	.write = iei_wt61p803_puzzle_write,
+};
+
+static const struct hwmon_channel_info *iei_wt61p803_puzzle_info[] = {
+	HWMON_CHANNEL_INFO(pwm,
+			HWMON_PWM_INPUT,
+			HWMON_PWM_INPUT),
+	HWMON_CHANNEL_INFO(fan,
+			HWMON_F_INPUT,
+			HWMON_F_INPUT,
+			HWMON_F_INPUT,
+			HWMON_F_INPUT,
+			HWMON_F_INPUT),
+	HWMON_CHANNEL_INFO(temp,
+			HWMON_T_INPUT,
+			HWMON_T_INPUT),
+	NULL
+};
+
+static const struct hwmon_chip_info iei_wt61p803_puzzle_chip_info = {
+	.ops = &iei_wt61p803_puzzle_hwmon_ops,
+	.info = iei_wt61p803_puzzle_info,
+};
+
+static int iei_wt61p803_puzzle_get_max_state
+(struct thermal_cooling_device *tcdev, unsigned long *state)
+{
+	*state = IEI_WT61P803_PUZZLE_HWMON_MAX_PWM_VAL;
+
+	return 0;
+}
+static int iei_wt61p803_puzzle_get_cur_state
+(struct thermal_cooling_device *tcdev, unsigned long *state)
+{
+	struct iei_wt61p803_puzzle_thermal_cooling_device *cdev = tcdev->devdata;
+	struct iei_wt61p803_puzzle_hwmon *mcu_hwmon = cdev->mcu_hwmon;
+
+	int ret, value;
+
+	if (!mcu_hwmon)
+		return -EINVAL;
+
+	ret = iei_wt61p803_puzzle_read_pwm_channel(mcu_hwmon,
+			cdev->pwm_channel, &value);
+	if (ret)
+		return ret;
+
+	*state = (unsigned long)value;
+
+	return 0;
+}
+static int iei_wt61p803_puzzle_set_cur_state
+(struct thermal_cooling_device *tcdev, unsigned long state)
+{
+	struct iei_wt61p803_puzzle_thermal_cooling_device *cdev = tcdev->devdata;
+	struct iei_wt61p803_puzzle_hwmon *mcu_hwmon = cdev->mcu_hwmon;
+
+	if (!mcu_hwmon)
+		return -EINVAL;
+
+	return iei_wt61p803_puzzle_write_pwm_channel(mcu_hwmon,
+			cdev->pwm_channel, state);
+}
+static const struct thermal_cooling_device_ops iei_wt61p803_puzzle_cooling_ops = {
+	.get_max_state = iei_wt61p803_puzzle_get_max_state,
+	.get_cur_state = iei_wt61p803_puzzle_get_cur_state,
+	.set_cur_state = iei_wt61p803_puzzle_set_cur_state,
+};
+
+static int iei_wt61p803_puzzle_enable_thermal_cooling_dev
+(struct device *dev, struct fwnode_handle *child, struct iei_wt61p803_puzzle_hwmon *mcu_hwmon)
+{
+	struct iei_wt61p803_puzzle_thermal_cooling_device *cdev;
+	int ret, num_levels;
+	u32 pwm_channel;
+
+	ret = fwnode_property_read_u32(child, "reg", &pwm_channel);
+	if (ret)
+		return ret;
+
+	mutex_lock(&mcu_hwmon->lock);
+	mcu_hwmon->thermal_cooling_dev_present[pwm_channel] = true;
+	mutex_unlock(&mcu_hwmon->lock);
+
+	num_levels = fwnode_property_read_u8_array(child, "cooling-levels", NULL, 0);
+	if (num_levels > 0) {
+		cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
+		if (!cdev)
+			return -ENOMEM;
+
+		cdev->cooling_levels = devm_kzalloc(dev, num_levels, GFP_KERNEL);
+		if (!cdev->cooling_levels)
+			return -ENOMEM;
+
+		ret = fwnode_property_read_u8_array(child, "cooling-levels",
+				cdev->cooling_levels, num_levels);
+		if (ret) {
+			dev_err(dev, "Couldn't read property 'cooling-levels'");
+			return ret;
+		}
+
+		snprintf(cdev->name, THERMAL_NAME_LENGTH, "iei_wt61p803_puzzle_%d", pwm_channel);
+
+		cdev->tcdev = devm_thermal_of_cooling_device_register(dev, NULL,
+				cdev->name, cdev, &iei_wt61p803_puzzle_cooling_ops);
+		if (IS_ERR(cdev->tcdev))
+			return PTR_ERR(cdev->tcdev);
+
+		cdev->mcu_hwmon = mcu_hwmon;
+		cdev->pwm_channel = pwm_channel;
+
+		mutex_lock(&mcu_hwmon->lock);
+		mcu_hwmon->cdev[pwm_channel] = cdev;
+		mutex_unlock(&mcu_hwmon->lock);
+	}
+	return 0;
+}
+
+static int iei_wt61p803_puzzle_hwmon_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev->parent);
+	struct iei_wt61p803_puzzle_hwmon *mcu_hwmon;
+	struct fwnode_handle *child;
+	struct device *hwmon_dev;
+	int ret;
+
+	mcu_hwmon = devm_kzalloc(dev, sizeof(*mcu_hwmon), GFP_KERNEL);
+	if (!mcu_hwmon)
+		return -ENOMEM;
+
+	mcu_hwmon->response_buffer = devm_kzalloc(dev,
+			IEI_WT61P803_PUZZLE_BUF_SIZE, GFP_KERNEL);
+	if (!mcu_hwmon->response_buffer)
+		return -ENOMEM;
+
+	mcu_hwmon->mcu = mcu;
+	mutex_init(&mcu_hwmon->lock);
+	platform_set_drvdata(pdev, mcu_hwmon);
+
+	hwmon_dev = devm_hwmon_device_register_with_info(dev,
+					"iei_wt61p803_puzzle",
+					mcu_hwmon,
+					&iei_wt61p803_puzzle_chip_info,
+					NULL);
+
+	if (IS_ERR(hwmon_dev))
+		return PTR_ERR(hwmon_dev);
+
+	/* Control fans via PWM lines via Linux Kernel */
+	if (IS_ENABLED(CONFIG_THERMAL)) {
+		device_for_each_child_node(dev, child) {
+			ret = iei_wt61p803_puzzle_enable_thermal_cooling_dev(dev, child, mcu_hwmon);
+			if (ret) {
+				dev_err(dev, "Enabling the PWM fan failed\n");
+				fwnode_handle_put(child);
+				return ret;
+			}
+		}
+	}
+	return 0;
+}
+
+static const struct of_device_id iei_wt61p803_puzzle_hwmon_id_table[] = {
+	{ .compatible = "iei,wt61p803-puzzle-hwmon" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, iei_wt61p803_puzzle_hwmon_id_table);
+
+static struct platform_driver iei_wt61p803_puzzle_hwmon_driver = {
+	.driver = {
+		.name = "iei-wt61p803-puzzle-hwmon",
+		.of_match_table = iei_wt61p803_puzzle_hwmon_id_table,
+	},
+	.probe = iei_wt61p803_puzzle_hwmon_probe,
+};
+
+module_platform_driver(iei_wt61p803_puzzle_hwmon_driver);
+
+MODULE_DESCRIPTION("iEi WT61P803 PUZZLE MCU HWMON Driver");
+MODULE_AUTHOR("Luka Kovacic <luka.kovacic@sartura.hr>");
+MODULE_LICENSE("GPL");
-- 
2.26.2

[PATCH v3 4/7] drivers: leds: Add the iEi WT61P803 PUZZLE LED driver

[Luka Kovacic]

Add support for the iEi WT61P803 PUZZLE LED driver.
Currently only the front panel power LED is supported.

This driver depends on the iEi WT61P803 PUZZLE MFD driver.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Robert Marko <robert.marko@sartura.hr>
---
 drivers/leds/Kconfig                    |   8 ++
 drivers/leds/Makefile                   |   1 +
 drivers/leds/leds-iei-wt61p803-puzzle.c | 157 ++++++++++++++++++++++++
 3 files changed, 166 insertions(+)
 create mode 100644 drivers/leds/leds-iei-wt61p803-puzzle.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 1c181df24eae..8a25fb753dec 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -332,6 +332,14 @@ config LEDS_IPAQ_MICRO
 	  Choose this option if you want to use the notification LED on
 	  Compaq/HP iPAQ h3100 and h3600.
 
+config LEDS_IEI_WT61P803_PUZZLE
+	tristate "LED Support for the iEi WT61P803 PUZZLE MCU"
+	depends on LEDS_CLASS
+	depends on MFD_IEI_WT61P803_PUZZLE
+	help
+	  This option enables support for LEDs controlled by the iEi WT61P803
+	  M801 MCU.
+
 config LEDS_HP6XX
 	tristate "LED Support for the HP Jornada 6xx"
 	depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index c2c7d7ade0d0..cd362437fefd 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_LEDS_HP6XX)		+= leds-hp6xx.o
 obj-$(CONFIG_LEDS_INTEL_SS4200)		+= leds-ss4200.o
 obj-$(CONFIG_LEDS_IP30)			+= leds-ip30.o
 obj-$(CONFIG_LEDS_IPAQ_MICRO)		+= leds-ipaq-micro.o
+obj-$(CONFIG_LEDS_IEI_WT61P803_PUZZLE)	+= leds-iei-wt61p803-puzzle.o
 obj-$(CONFIG_LEDS_IS31FL319X)		+= leds-is31fl319x.o
 obj-$(CONFIG_LEDS_IS31FL32XX)		+= leds-is31fl32xx.o
 obj-$(CONFIG_LEDS_KTD2692)		+= leds-ktd2692.o
diff --git a/drivers/leds/leds-iei-wt61p803-puzzle.c b/drivers/leds/leds-iei-wt61p803-puzzle.c
new file mode 100644
index 000000000000..b5822a835116
--- /dev/null
+++ b/drivers/leds/leds-iei-wt61p803-puzzle.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* iEi WT61P803 PUZZLE MCU LED Driver
+ *
+ * Copyright (C) 2020 Sartura Ltd.
+ * Author: Luka Kovacic <luka.kovacic@sartura.hr>
+ */
+
+#include <linux/leds.h>
+#include <linux/mfd/iei-wt61p803-puzzle.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+
+enum iei_wt61p803_puzzle_led_state {
+	IEI_LED_OFF = 0x30,
+	IEI_LED_ON = 0x31,
+	IEI_LED_BLINK_5HZ = 0x32,
+	IEI_LED_BLINK_1HZ = 0x33,
+};
+
+/**
+ * struct iei_wt61p803_puzzle_led - MCU LED Driver
+ *
+ * @mcu:		MCU struct pointer
+ * @response_buffer	Global MCU response buffer allocation
+ * @lock:		General mutex lock for LED operations
+ * @led_power_state:	State of the front panel power LED
+ * @cdev:		LED classdev
+ */
+struct iei_wt61p803_puzzle_led {
+	struct iei_wt61p803_puzzle *mcu;
+	unsigned char *response_buffer;
+	struct mutex lock;
+	int led_power_state;
+	struct led_classdev cdev;
+};
+
+static inline struct iei_wt61p803_puzzle_led *cdev_to_iei_wt61p803_puzzle_led
+	(struct led_classdev *led_cdev)
+{
+	return dev_get_drvdata(led_cdev->dev->parent);
+}
+
+static int iei_wt61p803_puzzle_led_brightness_set_blocking(struct led_classdev *cdev,
+		enum led_brightness brightness)
+{
+	struct iei_wt61p803_puzzle_led *priv = cdev_to_iei_wt61p803_puzzle_led(cdev);
+	unsigned char *resp_buf = priv->response_buffer;
+	unsigned char led_power_cmd[5] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_LED,
+		IEI_WT61P803_PUZZLE_CMD_LED_POWER,
+		(char)IEI_LED_OFF
+	};
+	size_t reply_size;
+
+	mutex_lock(&priv->lock);
+	if (brightness == LED_OFF) {
+		led_power_cmd[3] = (char)IEI_LED_OFF;
+		priv->led_power_state = LED_OFF;
+	} else {
+		led_power_cmd[3] = (char)IEI_LED_ON;
+		priv->led_power_state = LED_ON;
+	}
+	mutex_unlock(&priv->lock);
+
+	return iei_wt61p803_puzzle_write_command(priv->mcu, led_power_cmd,
+			sizeof(led_power_cmd), resp_buf, &reply_size);
+}
+
+static enum led_brightness
+iei_wt61p803_puzzle_led_brightness_get(struct led_classdev *cdev)
+{
+	struct iei_wt61p803_puzzle_led *priv =
+		cdev_to_iei_wt61p803_puzzle_led(cdev);
+	int led_state;
+
+	mutex_lock(&priv->lock);
+	led_state = priv->led_power_state;
+	mutex_unlock(&priv->lock);
+
+	return led_state;
+}
+
+static int iei_wt61p803_puzzle_led_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev->parent);
+	struct iei_wt61p803_puzzle_led *priv;
+	struct led_init_data init_data = {};
+	struct fwnode_handle *child;
+	int ret;
+	u32 reg;
+
+	if (device_get_child_node_count(dev) != 1)
+		return -EINVAL;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->response_buffer = devm_kzalloc(dev,
+			IEI_WT61P803_PUZZLE_BUF_SIZE, GFP_KERNEL);
+	if (!priv->response_buffer)
+		return -ENOMEM;
+
+	priv->mcu = mcu;
+	priv->led_power_state = 1;
+	mutex_init(&priv->lock);
+	dev_set_drvdata(dev, priv);
+
+	child = device_get_next_child_node(dev, NULL);
+
+	ret = fwnode_property_read_u32(child, "reg", &reg);
+	if (ret || reg > 1) {
+		dev_err(dev, "Could not register 'reg' (%lu)\n", (unsigned long)reg);
+		ret = -EINVAL;
+		goto err_child_node;
+	}
+
+	priv->cdev.brightness_set_blocking = iei_wt61p803_puzzle_led_brightness_set_blocking;
+	priv->cdev.brightness_get = iei_wt61p803_puzzle_led_brightness_get;
+	priv->cdev.max_brightness = 1;
+	init_data.fwnode = child;
+
+	ret = devm_led_classdev_register_ext(dev, &priv->cdev, &init_data);
+	if (ret) {
+		dev_err(dev, "Could not register LED\n");
+		goto err_child_node;
+	}
+	return 0;
+err_child_node:
+	fwnode_handle_put(child);
+	return ret;
+}
+
+static const struct of_device_id iei_wt61p803_puzzle_led_of_match[] = {
+	{ .compatible = "iei,wt61p803-puzzle-leds" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, iei_wt61p803_puzzle_led_of_match);
+
+static struct platform_driver iei_wt61p803_puzzle_led_driver = {
+	.driver = {
+		.name = "iei-wt61p803-puzzle-led",
+		.of_match_table = iei_wt61p803_puzzle_led_of_match,
+	},
+	.probe = iei_wt61p803_puzzle_led_probe,
+};
+module_platform_driver(iei_wt61p803_puzzle_led_driver);
+
+MODULE_DESCRIPTION("iEi WT61P803 PUZZLE front panel LED driver");
+MODULE_AUTHOR("Luka Kovacic <luka.kovacic@sartura.hr>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-iei-wt61p803-puzzle");
-- 
2.26.2

[PATCH v3 5/7] Documentation/ABI: Add iei-wt61p803-puzzle driver sysfs interface documentation

[Luka Kovacic]

Add the iei-wt61p803-puzzle driver sysfs interface documentation to allow
monitoring and control of the microcontroller from user space.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Robert Marko <robert.marko@sartura.hr>
---
 .../testing/sysfs-driver-iei-wt61p803-puzzle  | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-iei-wt61p803-puzzle

diff --git a/Documentation/ABI/testing/sysfs-driver-iei-wt61p803-puzzle b/Documentation/ABI/testing/sysfs-driver-iei-wt61p803-puzzle
new file mode 100644
index 000000000000..6e71d85f3296
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-iei-wt61p803-puzzle
@@ -0,0 +1,55 @@
+What:		/sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/mac_address_*
+Date:		September 2020
+Contact:	Luka Kovacic <luka.kovacic@sartura.hr>
+Description:	(RW) Internal factory assigned MAC address values
+
+What:		/sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/serial_number
+Date:		September 2020
+Contact:	Luka Kovacic <luka.kovacic@sartura.hr>
+Description:	(RW) Internal factory assigned serial number
+
+What:		/sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/version
+Date:		September 2020
+Contact:	Luka Kovacic <luka.kovacic@sartura.hr>
+Description:	(RO) Internal MCU firmware version
+
+What:		/sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/protocol_version
+Date:		September 2020
+Contact:	Luka Kovacic <luka.kovacic@sartura.hr>
+Description:	(RO) Internal MCU communication protocol version
+
+What:		/sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/power_loss_recovery
+Date:		September 2020
+Contact:	Luka Kovacic <luka.kovacic@sartura.hr>
+Description:	(RW) Host platform power loss recovery settings
+		Value mapping: 0 - Always-On, 1 - Always-Off, 2 - Always-AC, 3 - Always-WA
+
+What:		/sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/bootloader_mode
+Date:		September 2020
+Contact:	Luka Kovacic <luka.kovacic@sartura.hr>
+Description:	(RO) Internal MCU bootloader mode status
+
+What:		/sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/power_status
+Date:		September 2020
+Contact:	Luka Kovacic <luka.kovacic@sartura.hr>
+Description:	(RO) Power status indicates the host platform power on method.
+		Value mapping (bitwise list):
+		0x80 - Null
+		0x40 - Firmware flag
+		0x20 - Power loss detection flag (powered off)
+		0x10 - Power loss detection flag (AC mode)
+		0x08 - Button power on
+		0x04 - WOL power on
+		0x02 - RTC alarm power on
+		0x01 - AC recover power on
+
+What:		/sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/build_info
+Date:		September 2020
+Contact:	Luka Kovacic <luka.kovacic@sartura.hr>
+Description:	(RO) Internal MCU firmware build date
+		Format: yyyy/mm/dd hh:mm
+
+What:		/sys/bus/serial/devices/.../iei_wt61p803_puzzle_core/ac_recovery_status
+Date:		September 2020
+Contact:	Luka Kovacic <luka.kovacic@sartura.hr>
+Description:	(RO) Host platform AC recovery status value
-- 
2.26.2

[PATCH v3 6/7] MAINTAINERS: Add an entry for the iEi WT61P803 PUZZLE driver

[Luka Kovacic]

Add an entry for the iEi WT61P803 PUZZLE driver (MFD, HWMON, LED drivers).

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Robert Marko <robert.marko@sartura.hr>
---
 MAINTAINERS | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 190c7fa2ea01..0adf6cc499e5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8455,6 +8455,19 @@ F:	include/net/nl802154.h
 F:	net/ieee802154/
 F:	net/mac802154/
 
+IEI WT61P803 M801 MFD DRIVER
+M:	Luka Kovacic <luka.kovacic@sartura.hr>
+L:	linux-kernel@vger.kernel.org
+S:	Maintained
+F:	Documentation/ABI/stable/sysfs-driver-iei-wt61p803-puzzle
+F:	Documentation/devicetree/bindings/hwmon/iei,wt61p803-puzzle-hwmon.yaml
+F:	Documentation/devicetree/bindings/leds/iei,wt61p803-puzzle-leds.yaml
+F:	Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml
+F:	drivers/hwmon/iei-wt61p803-puzzle-hwmon.c
+F:	drivers/leds/leds-iei-wt61p803-puzzle.c
+F:	drivers/mfd/iei-wt61p803-puzzle.c
+F:	include/linux/mfd/iei-wt61p803-puzzle.h
+
 IFE PROTOCOL
 M:	Yotam Gigi <yotam.gi@gmail.com>
 M:	Jamal Hadi Salim <jhs@mojatatu.com>
-- 
2.26.2

[PATCH v3 7/7] arm64: dts: marvell: Add a device tree for the iEi Puzzle-M801 board

[Luka Kovacic]

Add initial support for the iEi Puzzle-M801 1U Rackmount Network
Appliance board.

The board is based on the quad-core Marvell Armada 8040 SoC and supports
up to 16 GB of DDR4 2400 MHz ECC RAM. It has a PCIe x16 slot (x2 lanes
only) and an M.2 type B slot.

Main system hardware:
2x USB 3.0
4x Gigabit Ethernet
2x SFP+
1x SATA 3.0
1x M.2 type B
1x RJ45 UART
1x SPI flash
1x iEi WT61P803 PUZZLE Microcontroller
1x EPSON RX8010 RTC (used instead of the integrated Marvell RTC controller)
6x SFP+ LED
1x HDD LED

All of the hardware listed above is supported and tested in this port.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Robert Marko <robert.marko@sartura.hr>
---
 arch/arm64/boot/dts/marvell/Makefile          |   1 +
 .../dts/marvell/armada-8040-puzzle-m801.dts   | 524 ++++++++++++++++++
 2 files changed, 525 insertions(+)
 create mode 100644 arch/arm64/boot/dts/marvell/armada-8040-puzzle-m801.dts

diff --git a/arch/arm64/boot/dts/marvell/Makefile b/arch/arm64/boot/dts/marvell/Makefile
index 3e5f2e7a040c..e413c3261792 100644
--- a/arch/arm64/boot/dts/marvell/Makefile
+++ b/arch/arm64/boot/dts/marvell/Makefile
@@ -12,6 +12,7 @@ dtb-$(CONFIG_ARCH_MVEBU) += armada-8040-clearfog-gt-8k.dtb
 dtb-$(CONFIG_ARCH_MVEBU) += armada-8040-db.dtb
 dtb-$(CONFIG_ARCH_MVEBU) += armada-8040-mcbin.dtb
 dtb-$(CONFIG_ARCH_MVEBU) += armada-8040-mcbin-singleshot.dtb
+dtb-$(CONFIG_ARCH_MVEBU) += armada-8040-puzzle-m801.dtb
 dtb-$(CONFIG_ARCH_MVEBU) += armada-8080-db.dtb
 dtb-$(CONFIG_ARCH_MVEBU) += cn9130-db.dtb
 dtb-$(CONFIG_ARCH_MVEBU) += cn9131-db.dtb
diff --git a/arch/arm64/boot/dts/marvell/armada-8040-puzzle-m801.dts b/arch/arm64/boot/dts/marvell/armada-8040-puzzle-m801.dts
new file mode 100644
index 000000000000..f1dd09ed22e9
--- /dev/null
+++ b/arch/arm64/boot/dts/marvell/armada-8040-puzzle-m801.dts
@@ -0,0 +1,524 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2016 Marvell Technology Group Ltd.
+ * Copyright (C) 2020 Sartura Ltd.
+ *
+ * Device Tree file for iEi Puzzle-M801
+ */
+
+#include "armada-8040.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	model = "iEi-Puzzle-M801";
+	compatible = "marvell,armada8040", "marvell,armada-ap806-quad", "marvell,armada-ap806";
+
+	aliases {
+		ethernet0 = &cp0_eth0;
+		ethernet1 = &cp1_eth0;
+		ethernet2 = &cp0_eth1;
+		ethernet3 = &cp0_eth2;
+		ethernet4 = &cp1_eth1;
+		ethernet5 = &cp1_eth2;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x0 0x0 0x80000000>;
+	};
+
+	/* Regulator labels correspond with schematics */
+	v_3_3: regulator-3-3v {
+		compatible = "regulator-fixed";
+		regulator-name = "v_3_3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+		status = "okay";
+	};
+
+	v_5v0_usb3_hst_vbus: regulator-usb3-vbus0 {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&cp0_gpio2 15 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&cp0_xhci_vbus_pins>;
+		regulator-name = "v_5v0_usb3_hst_vbus";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		status = "okay";
+	};
+
+	v_vddo_h: regulator-1-8v {
+		compatible = "regulator-fixed";
+		regulator-name = "v_vddo_h";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-always-on;
+		status = "okay";
+	};
+
+	sfp_cp0_eth0: sfp-cp0-eth0 {
+		compatible = "sff,sfp";
+		i2c-bus = <&sfpplus0_i2c>;
+		los-gpio = <&sfpplus_gpio 11 GPIO_ACTIVE_HIGH>;
+		mod-def0-gpio = <&sfpplus_gpio 10 GPIO_ACTIVE_LOW>;
+		tx-disable-gpio = <&sfpplus_gpio 9 GPIO_ACTIVE_HIGH>;
+		tx-fault-gpio  = <&sfpplus_gpio 8 GPIO_ACTIVE_HIGH>;
+		maximum-power-milliwatt = <3000>;
+	};
+
+	sfp_cp1_eth0: sfp-cp1-eth0 {
+		compatible = "sff,sfp";
+		i2c-bus = <&sfpplus1_i2c>;
+		los-gpio = <&sfpplus_gpio 3 GPIO_ACTIVE_HIGH>;
+		mod-def0-gpio = <&sfpplus_gpio 2 GPIO_ACTIVE_LOW>;
+		tx-disable-gpio = <&sfpplus_gpio 1 GPIO_ACTIVE_HIGH>;
+		tx-fault-gpio  = <&sfpplus_gpio 0 GPIO_ACTIVE_HIGH>;
+		maximum-power-milliwatt = <3000>;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		status = "okay";
+		pinctrl-0 = <&cp0_sfpplus_led_pins &cp1_sfpplus_led_pins>;
+		pinctrl-names = "default";
+
+		led-0 {
+			/* SFP+ port 2: Activity */
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <0>;
+			gpios = <&cp1_gpio1 6 GPIO_ACTIVE_LOW>;
+		};
+
+		led-1 {
+			/* SFP+ port 1: Activity */
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <1>;
+			gpios = <&cp1_gpio1 14 GPIO_ACTIVE_LOW>;
+		};
+
+		led-2 {
+			/* SFP+ port 2: 10 Gbps indicator */
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <2>;
+			gpios = <&cp1_gpio1 7 GPIO_ACTIVE_LOW>;
+		};
+
+		led-3 {
+			/* SFP+ port 2: 1 Gbps indicator */
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <3>;
+			gpios = <&cp1_gpio1 8 GPIO_ACTIVE_LOW>;
+		};
+
+		led-4 {
+			/* SFP+ port 1: 10 Gbps indicator */
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <4>;
+			gpios = <&cp1_gpio1 10 GPIO_ACTIVE_LOW>;
+		};
+
+		led-5 {
+			/* SFP+ port 1: 1 Gbps indicator */
+			function = LED_FUNCTION_LAN;
+			function-enumerator = <5>;
+			gpios = <&cp1_gpio1 31 GPIO_ACTIVE_LOW>;
+		};
+
+		led-6 {
+			function = LED_FUNCTION_DISK;
+			linux,default-trigger = "disk-activity";
+			gpios = <&cp0_gpio2 22 GPIO_ACTIVE_HIGH>;
+		};
+
+	};
+};
+
+&ap_sdhci0 {
+	bus-width = <8>;
+	/*
+	 * Not stable in HS modes - phy needs "more calibration", so add
+	 * the "slow-mode" and disable SDR104, SDR50 and DDR50 modes.
+	 */
+	marvell,xenon-phy-slow-mode;
+	no-1-8-v;
+	no-sd;
+	no-sdio;
+	non-removable;
+	status = "okay";
+	vqmmc-supply = <&v_vddo_h>;
+};
+
+&ap_thermal_cpu1 {
+	trips {
+		cpu_active: cpu-active {
+			temperature = <44000>;
+			hysteresis = <2000>;
+			type = "active";
+		};
+	};
+	cooling-maps {
+		fan-map {
+			trip = <&cpu_active>;
+			cooling-device = <&chassis_fan_group0 64 THERMAL_NO_LIMIT>,
+					<&chassis_fan_group1 64 THERMAL_NO_LIMIT>;
+		};
+	};
+};
+
+&i2c0 {
+	clock-frequency = <100000>;
+	status = "okay";
+
+	rtc@32 {
+		compatible = "epson,rx8010";
+		reg = <0x32>;
+	};
+};
+
+&spi0 {
+	status = "okay";
+	spi-flash@0 {
+		#address-cells = <0x1>;
+		#size-cells = <0x1>;
+		compatible = "jedec,spi-nor";
+		reg = <0x0>;
+		spi-max-frequency = <20000000>;
+		partition@u-boot {
+			label = "u-boot";
+			reg = <0x00000000 0x001f0000>;
+		};
+		partition@u-boot-env {
+			label = "u-boot-env";
+			reg = <0x001f0000 0x00010000>;
+		};
+		partition@ubi1 {
+			label = "ubi1";
+			reg = <0x00200000 0x03f00000>;
+		};
+		partition@ubi2 {
+			label = "ubi2";
+			reg = <0x04100000 0x03f00000>;
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+	pinctrl-0 = <&uart0_pins>;
+	pinctrl-names = "default";
+};
+
+&uart1 {
+	status = "okay";
+	/* iEi WT61P803 PUZZLE MCU Controller */
+	mcu {
+		compatible = "iei,wt61p803-puzzle";
+		current-speed = <115200>;
+		enable-beep;
+
+		leds {
+			compatible = "iei,wt61p803-puzzle-leds";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			led@0 {
+				reg = <0>;
+				function = LED_FUNCTION_POWER;
+				color = <LED_COLOR_ID_BLUE>;
+			};
+		};
+
+		iei-wt61p803-puzzle-hwmon {
+			compatible = "iei,wt61p803-puzzle-hwmon";
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			chassis_fan_group0:fan-group@0 {
+				#cooling-cells = <2>;
+				reg = <0x00>;
+				cooling-levels = <64 102 170 230 250>;
+			};
+
+			chassis_fan_group1:fan-group@1 {
+				#cooling-cells = <2>;
+				reg = <0x01>;
+				cooling-levels = <64 102 170 230 250>;
+			};
+		};
+	};
+};
+
+&cp0_rtc {
+	status = "disabled";
+};
+
+&cp0_i2c0 {
+	clock-frequency = <100000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&cp0_i2c0_pins>;
+	status = "okay";
+
+	sfpplus_gpio: gpio@21 {
+		compatible = "nxp,pca9555";
+		reg = <0x21>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+
+	eeprom@54 {
+		compatible = "atmel,24c04";
+		reg = <0x54>;
+	};
+};
+
+&cp0_i2c1 {
+	clock-frequency = <100000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&cp0_i2c1_pins>;
+	status = "okay";
+
+	i2c-switch@70 {
+		compatible = "nxp,pca9544";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0x70>;
+
+		sfpplus0_i2c: i2c@0 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0>;
+		};
+
+		sfpplus1_i2c: i2c@1 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <1>;
+		};
+	};
+};
+
+&cp0_uart1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&cp0_uart1_pins>;
+	status = "okay";
+};
+
+&cp0_mdio {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	status = "okay";
+
+	ge_phy2: ethernet-phy@0 {
+		reg = <0>;
+	};
+
+	ge_phy3: ethernet-phy@1 {
+		reg = <1>;
+	};
+};
+
+&cp0_pcie0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&cp0_pcie_pins>;
+	num-lanes = <1>;
+	num-viewport = <8>;
+	reset-gpios = <&cp0_gpio2 20 GPIO_ACTIVE_LOW>;
+	ranges = <0x82000000 0x0 0xc0000000 0x0 0xc0000000 0x0 0x20000000>;
+	phys = <&cp0_comphy0 0>;
+	phy-names = "cp0-pcie0-x1-phy";
+	status = "okay";
+};
+
+&cp0_pinctrl {
+	cp0_ge_mdio_pins: ge-mdio-pins {
+		marvell,pins = "mpp32", "mpp34";
+		marvell,function = "ge";
+	};
+	cp0_i2c1_pins: i2c1-pins {
+		marvell,pins = "mpp35", "mpp36";
+		marvell,function = "i2c1";
+	};
+	cp0_i2c0_pins: i2c0-pins {
+		marvell,pins = "mpp37", "mpp38";
+		marvell,function = "i2c0";
+	};
+	cp0_uart1_pins: uart1-pins {
+		marvell,pins = "mpp40", "mpp41";
+		marvell,function = "uart1";
+	};
+	cp0_xhci_vbus_pins: xhci0-vbus-pins {
+		marvell,pins = "mpp47";
+		marvell,function = "gpio";
+	};
+	cp0_pcie_pins: pcie-pins {
+		marvell,pins = "mpp52";
+		marvell,function = "gpio";
+	};
+	cp0_sdhci_pins: sdhci-pins {
+		marvell,pins = "mpp55", "mpp56", "mpp57", "mpp58", "mpp59",
+			       "mpp60", "mpp61";
+		marvell,function = "sdio";
+	};
+	cp0_sfpplus_led_pins: sfpplus-led-pins {
+		marvell,pins = "mpp54";
+		marvell,function = "gpio";
+	};
+};
+
+&cp0_ethernet {
+	status = "okay";
+};
+
+&cp0_eth0 {
+	status = "okay";
+	phy-mode = "10gbase-r";
+	phys = <&cp0_comphy4 0>;
+	local-mac-address = [ae 00 00 00 ff 00];
+	sfp = <&sfp_cp0_eth0>;
+	managed = "in-band-status";
+};
+
+&cp0_eth1 {
+	status = "okay";
+	phy = <&ge_phy2>;
+	phy-mode = "sgmii";
+	local-mac-address = [ae 00 00 00 ff 01];
+	phys = <&cp0_comphy3 1>;
+};
+
+&cp0_eth2 {
+	status = "okay";
+	phy-mode = "sgmii";
+	phys = <&cp0_comphy1 2>;
+	local-mac-address = [ae 00 00 00 ff 02];
+	phy = <&ge_phy3>;
+};
+
+&cp0_sata0 {
+	status = "okay";
+
+	sata-port@0 {
+		phys = <&cp0_comphy2 0>;
+		phy-names = "cp0-sata0-0-phy";
+	};
+
+	sata-port@1 {
+		phys = <&cp0_comphy5 1>;
+		phy-names = "cp0-sata0-1-phy";
+	};
+};
+
+&cp0_sdhci0 {
+	broken-cd;
+	bus-width = <4>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&cp0_sdhci_pins>;
+	status = "okay";
+	vqmmc-supply = <&v_3_3>;
+};
+
+&cp0_usb3_0 {
+	status = "okay";
+};
+
+&cp0_usb3_1 {
+	status = "okay";
+};
+
+&cp1_i2c0 {
+	clock-frequency = <100000>;
+	status = "disabled";
+};
+
+&cp1_i2c1 {
+	clock-frequency = <100000>;
+	status = "disabled";
+};
+
+&cp1_rtc {
+	status = "disabled";
+};
+
+&cp1_ethernet {
+	status = "okay";
+};
+
+&cp1_eth0 {
+	status = "okay";
+	phy-mode = "10gbase-r";
+	phys = <&cp1_comphy4 0>;
+	local-mac-address = [ae 00 00 00 ff 03];
+	sfp = <&sfp_cp1_eth0>;
+	managed = "in-band-status";
+};
+
+&cp1_eth1 {
+	status = "okay";
+	phy = <&ge_phy4>;
+	phy-mode = "sgmii";
+	local-mac-address = [ae 00 00 00 ff 04];
+	phys = <&cp1_comphy3 1>;
+};
+
+&cp1_eth2 {
+	status = "okay";
+	phy-mode = "sgmii";
+	local-mac-address = [ae 00 00 00 ff 05];
+	phys = <&cp1_comphy5 2>;
+	phy = <&ge_phy5>;
+};
+
+&cp1_pinctrl {
+	cp1_sfpplus_led_pins: sfpplus-led-pins {
+		marvell,pins = "mpp6", "mpp7", "mpp8", "mpp10", "mpp14", "mpp31";
+		marvell,function = "gpio";
+	};
+};
+
+&cp1_uart0 {
+	status = "disabled";
+};
+
+&cp1_comphy2 {
+	cp1_usbh0_con: connector {
+		compatible = "usb-a-connector";
+		phy-supply = <&v_5v0_usb3_hst_vbus>;
+	};
+};
+
+&cp1_usb3_0 {
+	phys = <&cp1_comphy2 0>;
+	phy-names = "cp1-usb3h0-comphy";
+	status = "okay";
+};
+
+&cp1_mdio {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	status = "okay";
+
+	ge_phy4: ethernet-phy@1 {
+		reg = <1>;
+	};
+	ge_phy5: ethernet-phy@0 {
+		reg = <0>;
+	};
+};
+
+&cp1_pcie0 {
+	num-lanes = <2>;
+	phys = <&cp1_comphy0 0>, <&cp1_comphy1 0>;
+	phy-names = "cp1-pcie0-x2-lane0-phy", "cp1-pcie0-x2-lane1-phy";
+	status = "okay";
+};
-- 
2.26.2

Re: [PATCH v3 2/7] drivers: mfd: Add a driver for iEi WT61P803 PUZZLE MCU

[kernel test robot]

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Hi Luka,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on hwmon/hwmon-next]
[also build test WARNING on lee-mfd/for-mfd-next pavel-linux-leds/for-next linus/master v5.9-rc7 next-20200929]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Luka-Kovacic/Add-support-for-the-iEi-Puzzle-M801-board/20200930-094341
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: openrisc-randconfig-r033-20200930 (attached as .config)
compiler: or1k-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/3f186576324e22bba3e3893d6f3cf3ce91d70da7
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Luka-Kovacic/Add-support-for-the-iEi-Puzzle-M801-board/20200930-094341
        git checkout 3f186576324e22bba3e3893d6f3cf3ce91d70da7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=openrisc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/mfd/iei-wt61p803-puzzle.c:309:5: warning: no previous prototype for 'iei_wt61p803_puzzle_buzzer' [-Wmissing-prototypes]
     309 | int iei_wt61p803_puzzle_buzzer(struct iei_wt61p803_puzzle *mcu, bool long_beep)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/iei_wt61p803_puzzle_buzzer +309 drivers/mfd/iei-wt61p803-puzzle.c

   308	
 > 309	int iei_wt61p803_puzzle_buzzer(struct iei_wt61p803_puzzle *mcu, bool long_beep)
   310	{
   311		unsigned char buzzer_short_cmd[4] = {
   312			IEI_WT61P803_PUZZLE_CMD_HEADER_START,
   313			IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE,
   314			'2'
   315		}; /* Buzzer 0.5 sec */
   316		unsigned char buzzer_long_cmd[4] = {
   317			IEI_WT61P803_PUZZLE_CMD_HEADER_START,
   318			IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE,
   319			'3'
   320		}; /* Buzzer 1.5 sec */
   321		unsigned char *resp_buf = mcu->response_buffer;
   322		size_t reply_size = 0;
   323		int ret;
   324	
   325		mutex_lock(&mcu->lock);
   326		ret = iei_wt61p803_puzzle_write_command(mcu,
   327				long_beep ? buzzer_long_cmd : buzzer_short_cmd, 4,
   328				resp_buf, &reply_size);
   329		if (ret)
   330			goto exit;
   331	
   332		if (reply_size != 3) {
   333			ret = -EIO;
   334			goto exit;
   335		}
   336	
   337		if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
   338			resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
   339			resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
   340			ret = -EPROTO;
   341			goto exit;
   342		}
   343	exit:
   344		mutex_unlock(&mcu->lock);
   345		return ret;
   346	}
   347	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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Re: [PATCH v3 4/7] drivers: leds: Add the iEi WT61P803 PUZZLE LED driver

[Pavel Machek]

[-- Attachment #1: Type: text/plain, Size: 1291 bytes --]

Hi!

> +static int iei_wt61p803_puzzle_led_brightness_set_blocking(struct led_classdev *cdev,
> +		enum led_brightness brightness)
> +{
> +	struct iei_wt61p803_puzzle_led *priv = cdev_to_iei_wt61p803_puzzle_led(cdev);
> +	unsigned char *resp_buf = priv->response_buffer;
> +	unsigned char led_power_cmd[5] = {
> +		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> +		IEI_WT61P803_PUZZLE_CMD_LED,
> +		IEI_WT61P803_PUZZLE_CMD_LED_POWER,
> +		(char)IEI_LED_OFF
> +	};
> +	size_t reply_size;
> +
> +	mutex_lock(&priv->lock);
> +	if (brightness == LED_OFF) {
> +		led_power_cmd[3] = (char)IEI_LED_OFF;
> +		priv->led_power_state = LED_OFF;
> +	} else {
> +		led_power_cmd[3] = (char)IEI_LED_ON;
> +		priv->led_power_state = LED_ON;
> +	}
> +	mutex_unlock(&priv->lock);
> +
> +	return iei_wt61p803_puzzle_write_command(priv->mcu, led_power_cmd,
> +			sizeof(led_power_cmd), resp_buf, &reply_size);
> +}

Is the mutex needed? If so, should it include the
iei_wt61p803_puzzle_write_command()? Does
iei_wt61p803_puzzle_write_command() have internal locking to prevent
two messages from being mingled?

Best regards,
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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Re: [PATCH v3 4/7] drivers: leds: Add the iEi WT61P803 PUZZLE LED driver

[Luka Kovacic]

On Wed, Sep 30, 2020 at 9:48 PM Pavel Machek <pavel@ucw.cz> wrote:
>
> Hi!
>
> > +static int iei_wt61p803_puzzle_led_brightness_set_blocking(struct led_classdev *cdev,
> > +             enum led_brightness brightness)
> > +{
> > +     struct iei_wt61p803_puzzle_led *priv = cdev_to_iei_wt61p803_puzzle_led(cdev);
> > +     unsigned char *resp_buf = priv->response_buffer;
> > +     unsigned char led_power_cmd[5] = {
> > +             IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> > +             IEI_WT61P803_PUZZLE_CMD_LED,
> > +             IEI_WT61P803_PUZZLE_CMD_LED_POWER,
> > +             (char)IEI_LED_OFF
> > +     };
> > +     size_t reply_size;
> > +
> > +     mutex_lock(&priv->lock);
> > +     if (brightness == LED_OFF) {
> > +             led_power_cmd[3] = (char)IEI_LED_OFF;
> > +             priv->led_power_state = LED_OFF;
> > +     } else {
> > +             led_power_cmd[3] = (char)IEI_LED_ON;
> > +             priv->led_power_state = LED_ON;
> > +     }
> > +     mutex_unlock(&priv->lock);
> > +
> > +     return iei_wt61p803_puzzle_write_command(priv->mcu, led_power_cmd,
> > +                     sizeof(led_power_cmd), resp_buf, &reply_size);
> > +}
>
> Is the mutex needed? If so, should it include the
> iei_wt61p803_puzzle_write_command()? Does
> iei_wt61p803_puzzle_write_command() have internal locking to prevent
> two messages from being mingled?
>
> Best regards,
>                                                                         Pavel
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Hello Pavel,

The mutex isn't needed and can be removed.
The function iei_wt61p803_puzzle_write_command() already handles its own
mutex locking, so a separate mutex isn't required.

Does brightness_set_blocking only block a single caller (each caller separately)
or does it block all callers until the previous caller is finished?

Kind regards,
Luka

Re: [PATCH v3 4/7] drivers: leds: Add the iEi WT61P803 PUZZLE LED driver

[Luka Kovacic]

On Tue, Oct 6, 2020 at 8:41 AM Luka Kovacic <luka.kovacic@sartura.hr> wrote:
>
> On Wed, Sep 30, 2020 at 9:48 PM Pavel Machek <pavel@ucw.cz> wrote:
> >
> > Hi!
> >
> > > +static int iei_wt61p803_puzzle_led_brightness_set_blocking(struct led_classdev *cdev,
> > > +             enum led_brightness brightness)
> > > +{
> > > +     struct iei_wt61p803_puzzle_led *priv = cdev_to_iei_wt61p803_puzzle_led(cdev);
> > > +     unsigned char *resp_buf = priv->response_buffer;
> > > +     unsigned char led_power_cmd[5] = {
> > > +             IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> > > +             IEI_WT61P803_PUZZLE_CMD_LED,
> > > +             IEI_WT61P803_PUZZLE_CMD_LED_POWER,
> > > +             (char)IEI_LED_OFF
> > > +     };
> > > +     size_t reply_size;
> > > +
> > > +     mutex_lock(&priv->lock);
> > > +     if (brightness == LED_OFF) {
> > > +             led_power_cmd[3] = (char)IEI_LED_OFF;
> > > +             priv->led_power_state = LED_OFF;
> > > +     } else {
> > > +             led_power_cmd[3] = (char)IEI_LED_ON;
> > > +             priv->led_power_state = LED_ON;
> > > +     }
> > > +     mutex_unlock(&priv->lock);
> > > +
> > > +     return iei_wt61p803_puzzle_write_command(priv->mcu, led_power_cmd,
> > > +                     sizeof(led_power_cmd), resp_buf, &reply_size);
> > > +}
> >
> > Is the mutex needed? If so, should it include the
> > iei_wt61p803_puzzle_write_command()? Does
> > iei_wt61p803_puzzle_write_command() have internal locking to prevent
> > two messages from being mingled?
> >
> > Best regards,
> >                                                                         Pavel
> >
> > --
> > (english) http://www.livejournal.com/~pavelmachek
> > (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
>
> Hello Pavel,
>
> The mutex isn't needed and can be removed.
> The function iei_wt61p803_puzzle_write_command() already handles its own
> mutex locking, so a separate mutex isn't required.
>
> Does brightness_set_blocking only block a single caller (each caller separately)
> or does it block all callers until the previous caller is finished?
>
> Kind regards,
> Luka

Hello Pavel,

I've sent out a new patchset, but I kept the mutex in use.
It's used to make sure only one read or write request is done at once,
when writing
to the LED driver private structure.

I have also added this description to the struct comment.

Kind regards,
Luka