drivers/leds/leds-88pm860x.c - maze/linux - Git at Google

 /*
  * 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/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_SHIFT		(3)
 #define LED_PWM_MASK		(0x1F)
 #define LED_CURRENT_MASK	(0x07 << 5)

 #define LED_BLINK_ON_MASK	(0x07)
 #define LED_BLINK_MASK		(0x7F)

 #define LED_BLINK_ON(x)		((x & 0x7) * 66 + 66)
 #define LED_BLINK_ON_MIN	LED_BLINK_ON(0)
 #define LED_BLINK_ON_MAX	LED_BLINK_ON(0x7)
 #define LED_ON_CONTINUOUS	(0x0F << 3)
 #define LED_TO_ON(x)		((x - 66) / 66)

 #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 blink_data;
 	int blink_time;
 	int blink_on;
 	int blink_off;
 };

 /* return offset of color register */
 static inline int __led_off(int port)
 {
 	int ret = -EINVAL;

 	switch (port) {
 	case PM8606_LED1_RED:
 	case PM8606_LED1_GREEN:
 	case PM8606_LED1_BLUE:
 		ret = port - PM8606_LED1_RED + PM8606_RGB1B;
 		break;
 	case PM8606_LED2_RED:
 	case PM8606_LED2_GREEN:
 	case PM8606_LED2_BLUE:
 		ret = port - PM8606_LED2_RED + PM8606_RGB2B;
 		break;
 	}
 	return ret;
 }

 /* return offset of blink register */
 static inline int __blink_off(int port)
 {
 	int ret = -EINVAL;

 	switch (port) {
 	case PM8606_LED1_RED:
 	case PM8606_LED1_GREEN:
 	case PM8606_LED1_BLUE:
 		ret = PM8606_RGB1A;
 		break;
 	case PM8606_LED2_RED:
 	case PM8606_LED2_GREEN:
 	case PM8606_LED2_BLUE:
 		ret = PM8606_RGB2A;
 		break;
 	}
 	return ret;
 }

 static inline int __blink_ctl_mask(int port)
 {
 	int ret = -EINVAL;

 	switch (port) {
 	case PM8606_LED1_RED:
 	case PM8606_LED1_GREEN:
 	case PM8606_LED1_BLUE:
 		ret = LED1_BLINK_EN;
 		break;
 	case PM8606_LED2_RED:
 	case PM8606_LED2_GREEN:
 	case PM8606_LED2_BLUE:
 		ret = LED2_BLINK_EN;
 		break;
 	}
 	return ret;
 }

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

 	switch (port) {
 	case PM8606_LED1_RED:
 	case PM8606_LED1_GREEN:
 	case PM8606_LED1_BLUE:
 		ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
 			pm8606_osc_disable(chip, RGB1_ENABLE);
 		break;
 	case PM8606_LED2_RED:
 	case PM8606_LED2_GREEN:
 	case PM8606_LED2_BLUE:
 		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 mask, 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_off(led->port),
 					LED_CURRENT_MASK, led->iset);
 		}
 		pm860x_set_bits(led->i2c, __blink_off(led->port),
 				LED_BLINK_MASK, LED_ON_CONTINUOUS);
 		mask = __blink_ctl_mask(led->port);
 		pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
 	}
 	pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK,
 			led->brightness);

 	if (led->brightness == 0) {
 		pm860x_bulk_read(led->i2c, __led_off(led->port), 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_off(led->port),
 					LED_CURRENT_MASK, 0);
 			mask = __blink_ctl_mask(led->port);
 			pm860x_set_bits(led->i2c, PM8606_WLED3B, 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_off(led->port), 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);
 }

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

 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "No I/O resource!\n");
 		return -EINVAL;
 	}

 	pdata = pdev->dev.platform_data;
 	if (pdata == NULL) {
 		dev_err(&pdev->dev, "No platform data!\n");
 		return -EINVAL;
 	}

 	data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
 	if (data == NULL)
 		return -ENOMEM;
 	strncpy(data->name, res->name, MFD_NAME_SIZE - 1);
 	dev_set_drvdata(&pdev->dev, data);
 	data->chip = chip;
 	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
 	data->iset = pdata->iset;
 	data->port = pdata->flags;
 	if (data->port < 0) {
 		dev_err(&pdev->dev, "check device failed\n");
 		kfree(data);
 		return -EINVAL;
 	}

 	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);
 		goto out;
 	}
 	pm860x_led_set(&data->cdev, 0);
 	return 0;
 out:
 	kfree(data);
 	return ret;
 }

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

 	led_classdev_unregister(&data->cdev);
 	kfree(data);

 	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/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_SHIFT (3)
	#define LED_PWM_MASK (0x1F)
	#define LED_CURRENT_MASK (0x07 << 5)

	#define LED_BLINK_ON_MASK (0x07)
	#define LED_BLINK_MASK (0x7F)

	#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
	#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
	#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
	#define LED_ON_CONTINUOUS (0x0F << 3)
	#define LED_TO_ON(x) ((x - 66) / 66)

	#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 blink_data;
	int blink_time;
	int blink_on;
	int blink_off;
	};

	/* return offset of color register */
	static inline int __led_off(int port)
	{
	int ret = -EINVAL;

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
	ret = port - PM8606_LED1_RED + PM8606_RGB1B;
	break;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
	ret = port - PM8606_LED2_RED + PM8606_RGB2B;
	break;
	}
	return ret;
	}

	/* return offset of blink register */
	static inline int __blink_off(int port)
	{
	int ret = -EINVAL;

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
	ret = PM8606_RGB1A;
	break;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
	ret = PM8606_RGB2A;
	break;
	}
	return ret;
	}

	static inline int __blink_ctl_mask(int port)
	{
	int ret = -EINVAL;

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
	ret = LED1_BLINK_EN;
	break;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
	ret = LED2_BLINK_EN;
	break;
	}
	return ret;
	}

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

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
	ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
	pm8606_osc_disable(chip, RGB1_ENABLE);
	break;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
	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 mask, 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_off(led->port),
	LED_CURRENT_MASK, led->iset);
	}
	pm860x_set_bits(led->i2c, __blink_off(led->port),
	LED_BLINK_MASK, LED_ON_CONTINUOUS);
	mask = __blink_ctl_mask(led->port);
	pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
	}
	pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK,
	led->brightness);

	if (led->brightness == 0) {
	pm860x_bulk_read(led->i2c, __led_off(led->port), 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_off(led->port),
	LED_CURRENT_MASK, 0);
	mask = __blink_ctl_mask(led->port);
	pm860x_set_bits(led->i2c, PM8606_WLED3B, 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_off(led->port), 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);
	}

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

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "No I/O resource!\n");
	return -EINVAL;
	}

	pdata = pdev->dev.platform_data;
	if (pdata == NULL) {
	dev_err(&pdev->dev, "No platform data!\n");
	return -EINVAL;
	}

	data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
	if (data == NULL)
	return -ENOMEM;
	strncpy(data->name, res->name, MFD_NAME_SIZE - 1);
	dev_set_drvdata(&pdev->dev, data);
	data->chip = chip;
	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
	data->iset = pdata->iset;
	data->port = pdata->flags;
	if (data->port < 0) {
	dev_err(&pdev->dev, "check device failed\n");
	kfree(data);
	return -EINVAL;
	}

	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);
	goto out;
	}
	pm860x_led_set(&data->cdev, 0);
	return 0;
	out:
	kfree(data);
	return ret;
	}

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

	led_classdev_unregister(&data->cdev);
	kfree(data);

	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");