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Message-Id: <20200905130336.967622-5-luka.kovacic@sartura.hr>
Date: Sat, 5 Sep 2020 15:03:33 +0200
From: Luka Kovacic <luka.kovacic@...tura.hr>
To: linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-leds@...r.kernel.org
Cc: lee.jones@...aro.org, pavel@....cz, dmurphy@...com,
robh+dt@...nel.org, jdelvare@...e.com, linux@...ck-us.net,
andrew@...n.ch, jason@...edaemon.net, gregory.clement@...tlin.com,
luka.perkov@...tura.hr, Luka Kovacic <luka.kovacic@...tura.hr>
Subject: [PATCH 4/7] drivers: leds: Add the iEi WT61P803 PUZZLE LED driver
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@...tura.hr>
Cc: Luka Perkov <luka.perkov@...tura.hr>
---
drivers/leds/Kconfig | 8 ++
drivers/leds/Makefile | 1 +
drivers/leds/leds-iei-wt61p803-puzzle.c | 184 ++++++++++++++++++++++++
3 files changed, 193 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..50d1e4e81571
--- /dev/null
+++ b/drivers/leds/leds-iei-wt61p803-puzzle.c
@@ -0,0 +1,184 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* iEi WT61P803 PUZZLE MCU LED Driver
+ *
+ * Copyright (C) 2020 Sartura Ltd.
+ * Author: Luka Kovacic <luka.kovacic@...tura.hr>
+ */
+
+#include <linux/module.h>
+#include <linux/mfd/iei-wt61p803-puzzle.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <linux/leds.h>
+
+#define CMD_CHAR(x) (char)(x)
+
+/**
+ * enum iei_wt61p803_puzzle_led_state - LED state values
+ *
+ * @IEI_LED_OFF: The LED is turned off
+ * @IEI_LED_ON: The LED is turned on
+ * @IEI_LED_BLINK_5HZ: The LED will blink with a freq of 5 Hz
+ * @IEI_LED_BLINK_1HZ: The LED will blink with a freq of 1 Hz
+ */
+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
+ * @lock: General mutex lock for LED operations
+ * @led_power_state: State of the front panel power LED
+ */
+struct iei_wt61p803_puzzle_led {
+ struct iei_wt61p803_puzzle *mcu;
+ struct mutex lock;
+
+ int led_power_state;
+};
+
+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 *mcu_led =
+ cdev_to_iei_wt61p803_puzzle_led(cdev);
+ unsigned char led_power_cmd[5] = { '@', 'R', '1',
+ CMD_CHAR(IEI_LED_OFF) };
+
+ int ret;
+
+ size_t reply_size = 0;
+ unsigned char *resp_buf = kmalloc(IEI_WT61P803_PUZZLE_BUF_SIZE, GFP_KERNEL);
+
+ mutex_lock(&mcu_led->lock);
+
+ if (brightness == LED_OFF) {
+ led_power_cmd[3] = CMD_CHAR(IEI_LED_OFF);
+ mcu_led->led_power_state = LED_OFF;
+ } else {
+ led_power_cmd[3] = CMD_CHAR(IEI_LED_ON);
+ mcu_led->led_power_state = LED_ON;
+ }
+
+ mutex_unlock(&mcu_led->lock);
+
+ ret = iei_wt61p803_puzzle_write_command(mcu_led->mcu, led_power_cmd,
+ sizeof(led_power_cmd), resp_buf, &reply_size);
+
+ kfree(resp_buf);
+
+ return ret;
+}
+
+static enum led_brightness
+iei_wt61p803_puzzle_led_brightness_get(struct led_classdev *cdev)
+{
+ struct iei_wt61p803_puzzle_led *mcu_led =
+ cdev_to_iei_wt61p803_puzzle_led(cdev);
+
+ int led_state;
+
+ mutex_lock(&mcu_led->lock);
+ led_state = mcu_led->led_power_state;
+ mutex_unlock(&mcu_led->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 device_node *np = dev->of_node;
+
+ struct iei_wt61p803_puzzle_led *mcu_led;
+ struct device_node *child;
+
+ int ret;
+
+ mcu_led = devm_kzalloc(dev, sizeof(*mcu_led), GFP_KERNEL);
+ if (!mcu_led)
+ return -ENOMEM;
+
+ mcu_led->mcu = mcu;
+
+ /* The default LED power state is 1 */
+ mcu_led->led_power_state = 1;
+
+ /* Init the mutex lock */
+ mutex_init(&mcu_led->lock);
+
+ dev_set_drvdata(dev, mcu_led);
+
+ for_each_child_of_node(np, child) {
+ struct led_classdev *led;
+ u32 reg;
+
+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ ret = of_property_read_u32(child, "reg", ®);
+ if (ret || reg > 1) {
+ dev_err(dev, "Could not register 'reg' of %s\n",
+ child->name);
+ continue;
+ }
+
+ if (of_property_read_string(child, "label", &led->name))
+ led->name = child->name;
+
+ of_property_read_string(child, "linux,default-trigger",
+ &led->default_trigger);
+
+ led->brightness_set_blocking =
+ iei_wt61p803_puzzle_led_brightness_set_blocking;
+ led->brightness_get = iei_wt61p803_puzzle_led_brightness_get;
+
+ led->max_brightness = 1;
+
+ ret = devm_led_classdev_register(dev, led);
+ if (ret) {
+ dev_err(dev, "Could not register %s\n", led->name);
+ return ret;
+ }
+ }
+
+ return 0;
+
+}
+
+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@...tura.hr>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-iei-wt61p803-puzzle");
--
2.20.1
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