drivers/leds/leds-88pm860x.c - kernel/msm-4.19 - Gitiles

 /*
  * LED driver for Marvell 88PM860x
  *
  * Copyright (C) 2009 Marvell International Ltd.
  *	Haojian Zhuang <haojian.zhuang@marvell.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
 #include <linux/leds.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 #include <linux/mfd/88pm860x.h>
 #include <linux/module.h>

 #define LED_PWM_MASK		(0x1F)
 #define LED_CURRENT_MASK	(0x07 << 5)

 #define LED_BLINK_MASK		(0x7F)

 #define LED_ON_CONTINUOUS	(0x0F << 3)

 #define LED1_BLINK_EN		(1 << 1)
 #define LED2_BLINK_EN		(1 << 2)

 struct pm860x_led {
 	struct led_classdev cdev;
 	struct i2c_client *i2c;
 	struct work_struct work;
 	struct pm860x_chip *chip;
 	struct mutex lock;
 	char name[MFD_NAME_SIZE];

 	int port;
 	int iset;
 	unsigned char brightness;
 	unsigned char current_brightness;

 	int reg_control;
 	int reg_blink;
 	int blink_mask;
 };

 static int led_power_set(struct pm860x_chip *chip, int port, int on)
 {
 	int ret = -EINVAL;

 	switch (port) {
 	case 0:
 	case 1:
 	case 2:
 		ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
 			pm8606_osc_disable(chip, RGB1_ENABLE);
 		break;
 	case 3:
 	case 4:
 	case 5:
 		ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
 			pm8606_osc_disable(chip, RGB2_ENABLE);
 		break;
 	}
 	return ret;
 }

 static void pm860x_led_work(struct work_struct *work)
 {

 	struct pm860x_led *led;
 	struct pm860x_chip *chip;
 	unsigned char buf[3];
 	int ret;

 	led = container_of(work, struct pm860x_led, work);
 	chip = led->chip;
 	mutex_lock(&led->lock);
 	if ((led->current_brightness == 0) && led->brightness) {
 		led_power_set(chip, led->port, 1);
 		if (led->iset) {
 			pm860x_set_bits(led->i2c, led->reg_control,
 					LED_CURRENT_MASK, led->iset);
 		}
 		pm860x_set_bits(led->i2c, led->reg_blink,
 				LED_BLINK_MASK, LED_ON_CONTINUOUS);
 		pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
 				led->blink_mask);
 	}
 	pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
 			led->brightness);

 	if (led->brightness == 0) {
 		pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
 		ret = buf[0] & LED_PWM_MASK;
 		ret |= buf[1] & LED_PWM_MASK;
 		ret |= buf[2] & LED_PWM_MASK;
 		if (ret == 0) {
 			/* unset current since no led is lighting */
 			pm860x_set_bits(led->i2c, led->reg_control,
 					LED_CURRENT_MASK, 0);
 			pm860x_set_bits(led->i2c, PM8606_WLED3B,
 					led->blink_mask, 0);
 			led_power_set(chip, led->port, 0);
 		}
 	}
 	led->current_brightness = led->brightness;
 	dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
 		led->reg_control, led->brightness);
 	mutex_unlock(&led->lock);
 }

 static void pm860x_led_set(struct led_classdev *cdev,
 			   enum led_brightness value)
 {
 	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);

 	data->brightness = value >> 3;
 	schedule_work(&data->work);
 }

 #ifdef CONFIG_OF
 static int pm860x_led_dt_init(struct platform_device *pdev,
 			      struct pm860x_led *data)
 {
 	struct device_node *nproot, *np;
 	int iset = 0;

 	nproot = of_node_get(pdev->dev.parent->of_node);
 	if (!nproot)
 		return -ENODEV;
 	nproot = of_find_node_by_name(nproot, "leds");
 	if (!nproot) {
 		dev_err(&pdev->dev, "failed to find leds node\n");
 		return -ENODEV;
 	}
 	for_each_child_of_node(nproot, np) {
 		if (!of_node_cmp(np->name, data->name)) {
 			of_property_read_u32(np, "marvell,88pm860x-iset",
 					     &iset);
 			data->iset = PM8606_LED_CURRENT(iset);
 			break;
 		}
 	}
 	of_node_put(nproot);
 	return 0;
 }
 #else
 #define pm860x_led_dt_init(x, y)	(-1)
 #endif

 static int pm860x_led_probe(struct platform_device *pdev)
 {
 	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 	struct pm860x_led_pdata *pdata = pdev->dev.platform_data;
 	struct pm860x_led *data;
 	struct resource *res;
 	int ret = 0;

 	data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
 	if (data == NULL)
 		return -ENOMEM;
 	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
 	if (!res) {
 		dev_err(&pdev->dev, "No REG resource for control\n");
 		return -ENXIO;
 	}
 	data->reg_control = res->start;
 	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
 	if (!res) {
 		dev_err(&pdev->dev, "No REG resource for blink\n");
 		return -ENXIO;
 	}
 	data->reg_blink = res->start;
 	memset(data->name, 0, MFD_NAME_SIZE);
 	switch (pdev->id) {
 	case 0:
 		data->blink_mask = LED1_BLINK_EN;
 		sprintf(data->name, "led0-red");
 		break;
 	case 1:
 		data->blink_mask = LED1_BLINK_EN;
 		sprintf(data->name, "led0-green");
 		break;
 	case 2:
 		data->blink_mask = LED1_BLINK_EN;
 		sprintf(data->name, "led0-blue");
 		break;
 	case 3:
 		data->blink_mask = LED2_BLINK_EN;
 		sprintf(data->name, "led1-red");
 		break;
 	case 4:
 		data->blink_mask = LED2_BLINK_EN;
 		sprintf(data->name, "led1-green");
 		break;
 	case 5:
 		data->blink_mask = LED2_BLINK_EN;
 		sprintf(data->name, "led1-blue");
 		break;
 	}
 	dev_set_drvdata(&pdev->dev, data);
 	data->chip = chip;
 	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
 	data->port = pdev->id;
 	if (pm860x_led_dt_init(pdev, data))
 		if (pdata)
 			data->iset = pdata->iset;

 	data->current_brightness = 0;
 	data->cdev.name = data->name;
 	data->cdev.brightness_set = pm860x_led_set;
 	mutex_init(&data->lock);
 	INIT_WORK(&data->work, pm860x_led_work);

 	ret = led_classdev_register(chip->dev, &data->cdev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
 		return ret;
 	}
 	pm860x_led_set(&data->cdev, 0);
 	return 0;
 }

 static int pm860x_led_remove(struct platform_device *pdev)
 {
 	struct pm860x_led *data = platform_get_drvdata(pdev);

 	led_classdev_unregister(&data->cdev);

 	return 0;
 }

 static struct platform_driver pm860x_led_driver = {
 	.driver	= {
 		.name	= "88pm860x-led",
 		.owner	= THIS_MODULE,
 	},
 	.probe	= pm860x_led_probe,
 	.remove	= pm860x_led_remove,
 };

 module_platform_driver(pm860x_led_driver);

 MODULE_DESCRIPTION("LED driver for Marvell PM860x");
 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:88pm860x-led");
	/*
	* LED driver for Marvell 88PM860x
	*
	* Copyright (C) 2009 Marvell International Ltd.
	* Haojian Zhuang <haojian.zhuang@marvell.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/i2c.h>
	#include <linux/leds.h>
	#include <linux/slab.h>
	#include <linux/workqueue.h>
	#include <linux/mfd/88pm860x.h>
	#include <linux/module.h>

	#define LED_PWM_MASK (0x1F)
	#define LED_CURRENT_MASK (0x07 << 5)

	#define LED_BLINK_MASK (0x7F)

	#define LED_ON_CONTINUOUS (0x0F << 3)

	#define LED1_BLINK_EN (1 << 1)
	#define LED2_BLINK_EN (1 << 2)

	struct pm860x_led {
	struct led_classdev cdev;
	struct i2c_client *i2c;
	struct work_struct work;
	struct pm860x_chip *chip;
	struct mutex lock;
	char name[MFD_NAME_SIZE];

	int port;
	int iset;
	unsigned char brightness;
	unsigned char current_brightness;

	int reg_control;
	int reg_blink;
	int blink_mask;
	};

	static int led_power_set(struct pm860x_chip *chip, int port, int on)
	{
	int ret = -EINVAL;

	switch (port) {
	case 0:
	case 1:
	case 2:
	ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
	pm8606_osc_disable(chip, RGB1_ENABLE);
	break;
	case 3:
	case 4:
	case 5:
	ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
	pm8606_osc_disable(chip, RGB2_ENABLE);
	break;
	}
	return ret;
	}

	static void pm860x_led_work(struct work_struct *work)
	{

	struct pm860x_led *led;
	struct pm860x_chip *chip;
	unsigned char buf[3];
	int ret;

	led = container_of(work, struct pm860x_led, work);
	chip = led->chip;
	mutex_lock(&led->lock);
	if ((led->current_brightness == 0) && led->brightness) {
	led_power_set(chip, led->port, 1);
	if (led->iset) {
	pm860x_set_bits(led->i2c, led->reg_control,
	LED_CURRENT_MASK, led->iset);
	}
	pm860x_set_bits(led->i2c, led->reg_blink,
	LED_BLINK_MASK, LED_ON_CONTINUOUS);
	pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
	led->blink_mask);
	}
	pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
	led->brightness);

	if (led->brightness == 0) {
	pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
	ret = buf[0] & LED_PWM_MASK;
	ret \|= buf[1] & LED_PWM_MASK;
	ret \|= buf[2] & LED_PWM_MASK;
	if (ret == 0) {
	/* unset current since no led is lighting */
	pm860x_set_bits(led->i2c, led->reg_control,
	LED_CURRENT_MASK, 0);
	pm860x_set_bits(led->i2c, PM8606_WLED3B,
	led->blink_mask, 0);
	led_power_set(chip, led->port, 0);
	}
	}
	led->current_brightness = led->brightness;
	dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
	led->reg_control, led->brightness);
	mutex_unlock(&led->lock);
	}

	static void pm860x_led_set(struct led_classdev *cdev,
	enum led_brightness value)
	{
	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);

	data->brightness = value >> 3;
	schedule_work(&data->work);
	}

	#ifdef CONFIG_OF
	static int pm860x_led_dt_init(struct platform_device *pdev,
	struct pm860x_led *data)
	{
	struct device_node nproot, np;
	int iset = 0;

	nproot = of_node_get(pdev->dev.parent->of_node);
	if (!nproot)
	return -ENODEV;
	nproot = of_find_node_by_name(nproot, "leds");
	if (!nproot) {
	dev_err(&pdev->dev, "failed to find leds node\n");
	return -ENODEV;
	}
	for_each_child_of_node(nproot, np) {
	if (!of_node_cmp(np->name, data->name)) {
	of_property_read_u32(np, "marvell,88pm860x-iset",
	&iset);
	data->iset = PM8606_LED_CURRENT(iset);
	break;
	}
	}
	of_node_put(nproot);
	return 0;
	}
	#else
	#define pm860x_led_dt_init(x, y) (-1)
	#endif

	static int pm860x_led_probe(struct platform_device *pdev)
	{
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct pm860x_led_pdata *pdata = pdev->dev.platform_data;
	struct pm860x_led *data;
	struct resource *res;
	int ret = 0;

	data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
	if (data == NULL)
	return -ENOMEM;
	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
	if (!res) {
	dev_err(&pdev->dev, "No REG resource for control\n");
	return -ENXIO;
	}
	data->reg_control = res->start;
	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
	if (!res) {
	dev_err(&pdev->dev, "No REG resource for blink\n");
	return -ENXIO;
	}
	data->reg_blink = res->start;
	memset(data->name, 0, MFD_NAME_SIZE);
	switch (pdev->id) {
	case 0:
	data->blink_mask = LED1_BLINK_EN;
	sprintf(data->name, "led0-red");
	break;
	case 1:
	data->blink_mask = LED1_BLINK_EN;
	sprintf(data->name, "led0-green");
	break;
	case 2:
	data->blink_mask = LED1_BLINK_EN;
	sprintf(data->name, "led0-blue");
	break;
	case 3:
	data->blink_mask = LED2_BLINK_EN;
	sprintf(data->name, "led1-red");
	break;
	case 4:
	data->blink_mask = LED2_BLINK_EN;
	sprintf(data->name, "led1-green");
	break;
	case 5:
	data->blink_mask = LED2_BLINK_EN;
	sprintf(data->name, "led1-blue");
	break;
	}
	dev_set_drvdata(&pdev->dev, data);
	data->chip = chip;
	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
	data->port = pdev->id;
	if (pm860x_led_dt_init(pdev, data))
	if (pdata)
	data->iset = pdata->iset;

	data->current_brightness = 0;
	data->cdev.name = data->name;
	data->cdev.brightness_set = pm860x_led_set;
	mutex_init(&data->lock);
	INIT_WORK(&data->work, pm860x_led_work);

	ret = led_classdev_register(chip->dev, &data->cdev);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
	return ret;
	}
	pm860x_led_set(&data->cdev, 0);
	return 0;
	}

	static int pm860x_led_remove(struct platform_device *pdev)
	{
	struct pm860x_led *data = platform_get_drvdata(pdev);

	led_classdev_unregister(&data->cdev);

	return 0;
	}

	static struct platform_driver pm860x_led_driver = {
	.driver = {
	.name = "88pm860x-led",
	.owner = THIS_MODULE,
	},
	.probe = pm860x_led_probe,
	.remove = pm860x_led_remove,
	};

	module_platform_driver(pm860x_led_driver);

	MODULE_DESCRIPTION("LED driver for Marvell PM860x");
	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:88pm860x-led");