[PATCH v5 4/7] drivers: leds: Add the iEi WT61P803 PUZZLE LED driver

From: Luka Kovacic
Date: Fri Oct 09 2020 - 20:19:23 EST

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@xxxxxxxxxx>
Cc: Luka Perkov <luka.perkov@xxxxxxxxxx>
Cc: Robert Marko <robert.marko@xxxxxxxxxx>
---
Changes for v5:
- Remove the return before goto to also fwnode_handle_put(child)
when ret is 0.

This change will be added to the patchset changelog.

drivers/leds/Kconfig | 8 ++
drivers/leds/Makefile | 1 +
drivers/leds/leds-iei-wt61p803-puzzle.c | 155 ++++++++++++++++++++++++
3 files changed, 164 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..4e287572b1f5
--- /dev/null
+++ b/drivers/leds/leds-iei-wt61p803-puzzle.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* iEi WT61P803 PUZZLE MCU LED Driver
+ *
+ * Copyright (C) 2020 Sartura Ltd.
+ * Author: Luka Kovacic <luka.kovacic@xxxxxxxxxx>
+ */
+
+#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 to protect simultaneous R/W access to led_power_state
+ * @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;
+ }
+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@xxxxxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-iei-wt61p803-puzzle");
--
2.26.2