drivers/leds/leds-mc13783.c - linux/kernel/git/viro/vfs - Git at Google

 /*
  * LEDs driver for Freescale MC13783/MC13892
  *
  * Copyright (C) 2010 Philippe Rétornaz
  *
  * Based on leds-da903x:
  * Copyright (C) 2008 Compulab, Ltd.
  *      Mike Rapoport <mike@compulab.co.il>
  *
  * Copyright (C) 2006-2008 Marvell International Ltd.
  *      Eric Miao <eric.miao@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/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/leds.h>
 #include <linux/workqueue.h>
 #include <linux/mfd/mc13xxx.h>

 #define MC13XXX_REG_LED_CONTROL(x)	(51 + (x))

 struct mc13xxx_led_devtype {
 	int	led_min;
 	int	led_max;
 	int	num_regs;
 };

 struct mc13xxx_led {
 	struct led_classdev	cdev;
 	struct work_struct	work;
 	struct mc13xxx		*master;
 	enum led_brightness	new_brightness;
 	int			id;
 };

 struct mc13xxx_leds {
 	struct mc13xxx_led_devtype	*devtype;
 	int				num_leds;
 	struct mc13xxx_led		led[0];
 };

 static void mc13xxx_led_work(struct work_struct *work)
 {
 	struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
 	int reg, mask, value, bank, off, shift;

 	switch (led->id) {
 	case MC13783_LED_MD:
 		reg = MC13XXX_REG_LED_CONTROL(2);
 		shift = 9;
 		mask = 0x0f;
 		value = led->new_brightness >> 4;
 		break;
 	case MC13783_LED_AD:
 		reg = MC13XXX_REG_LED_CONTROL(2);
 		shift = 13;
 		mask = 0x0f;
 		value = led->new_brightness >> 4;
 		break;
 	case MC13783_LED_KP:
 		reg = MC13XXX_REG_LED_CONTROL(2);
 		shift = 17;
 		mask = 0x0f;
 		value = led->new_brightness >> 4;
 		break;
 	case MC13783_LED_R1:
 	case MC13783_LED_G1:
 	case MC13783_LED_B1:
 	case MC13783_LED_R2:
 	case MC13783_LED_G2:
 	case MC13783_LED_B2:
 	case MC13783_LED_R3:
 	case MC13783_LED_G3:
 	case MC13783_LED_B3:
 		off = led->id - MC13783_LED_R1;
 		bank = off / 3;
 		reg = MC13XXX_REG_LED_CONTROL(3) + bank;
 		shift = (off - bank * 3) * 5 + 6;
 		value = led->new_brightness >> 3;
 		mask = 0x1f;
 		break;
 	case MC13892_LED_MD:
 		reg = MC13XXX_REG_LED_CONTROL(0);
 		shift = 3;
 		mask = 0x3f;
 		value = led->new_brightness >> 2;
 		break;
 	case MC13892_LED_AD:
 		reg = MC13XXX_REG_LED_CONTROL(0);
 		shift = 15;
 		mask = 0x3f;
 		value = led->new_brightness >> 2;
 		break;
 	case MC13892_LED_KP:
 		reg = MC13XXX_REG_LED_CONTROL(1);
 		shift = 3;
 		mask = 0x3f;
 		value = led->new_brightness >> 2;
 		break;
 	case MC13892_LED_R:
 	case MC13892_LED_G:
 	case MC13892_LED_B:
 		off = led->id - MC13892_LED_R;
 		bank = off / 2;
 		reg = MC13XXX_REG_LED_CONTROL(2) + bank;
 		shift = (off - bank * 2) * 12 + 3;
 		value = led->new_brightness >> 2;
 		mask = 0x3f;
 		break;
 	default:
 		BUG();
 	}

 	mc13xxx_lock(led->master);
 	mc13xxx_reg_rmw(led->master, reg, mask << shift, value << shift);
 	mc13xxx_unlock(led->master);
 }

 static void mc13xxx_led_set(struct led_classdev *led_cdev,
 			    enum led_brightness value)
 {
 	struct mc13xxx_led *led =
 		container_of(led_cdev, struct mc13xxx_led, cdev);

 	led->new_brightness = value;
 	schedule_work(&led->work);
 }

 static int __init mc13xxx_led_setup(struct mc13xxx_led *led, int max_current)
 {
 	int shift, mask, reg, ret, bank;

 	switch (led->id) {
 	case MC13783_LED_MD:
 		reg = MC13XXX_REG_LED_CONTROL(2);
 		shift = 0;
 		mask = 0x07;
 		break;
 	case MC13783_LED_AD:
 		reg = MC13XXX_REG_LED_CONTROL(2);
 		shift = 3;
 		mask = 0x07;
 		break;
 	case MC13783_LED_KP:
 		reg = MC13XXX_REG_LED_CONTROL(2);
 		shift = 6;
 		mask = 0x07;
 		break;
 	case MC13783_LED_R1:
 	case MC13783_LED_G1:
 	case MC13783_LED_B1:
 	case MC13783_LED_R2:
 	case MC13783_LED_G2:
 	case MC13783_LED_B2:
 	case MC13783_LED_R3:
 	case MC13783_LED_G3:
 	case MC13783_LED_B3:
 		bank = (led->id - MC13783_LED_R1) / 3;
 		reg = MC13XXX_REG_LED_CONTROL(3) + bank;
 		shift = ((led->id - MC13783_LED_R1) - bank * 3) * 2;
 		mask = 0x03;
 		break;
 	case MC13892_LED_MD:
 		reg = MC13XXX_REG_LED_CONTROL(0);
 		shift = 9;
 		mask = 0x07;
 		break;
 	case MC13892_LED_AD:
 		reg = MC13XXX_REG_LED_CONTROL(0);
 		shift = 21;
 		mask = 0x07;
 		break;
 	case MC13892_LED_KP:
 		reg = MC13XXX_REG_LED_CONTROL(1);
 		shift = 9;
 		mask = 0x07;
 		break;
 	case MC13892_LED_R:
 	case MC13892_LED_G:
 	case MC13892_LED_B:
 		bank = (led->id - MC13892_LED_R) / 2;
 		reg = MC13XXX_REG_LED_CONTROL(2) + bank;
 		shift = ((led->id - MC13892_LED_R) - bank * 2) * 12 + 9;
 		mask = 0x07;
 		break;
 	default:
 		BUG();
 	}

 	mc13xxx_lock(led->master);
 	ret = mc13xxx_reg_rmw(led->master, reg, mask << shift,
 			      max_current << shift);
 	mc13xxx_unlock(led->master);

 	return ret;
 }

 static int __init mc13xxx_led_probe(struct platform_device *pdev)
 {
 	struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
 	struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
 	struct mc13xxx_led_devtype *devtype =
 		(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
 	struct mc13xxx_leds *leds;
 	int i, id, num_leds, ret = -ENODATA;
 	u32 reg, init_led = 0;

 	if (!pdata) {
 		dev_err(&pdev->dev, "Missing platform data\n");
 		return -ENODEV;
 	}

 	num_leds = pdata->num_leds;

 	if ((num_leds < 1) ||
 	    (num_leds > (devtype->led_max - devtype->led_min + 1))) {
 		dev_err(&pdev->dev, "Invalid LED count %d\n", num_leds);
 		return -EINVAL;
 	}

 	leds = devm_kzalloc(&pdev->dev, num_leds * sizeof(struct mc13xxx_led) +
 			    sizeof(struct mc13xxx_leds), GFP_KERNEL);
 	if (!leds)
 		return -ENOMEM;

 	leds->devtype = devtype;
 	leds->num_leds = num_leds;
 	platform_set_drvdata(pdev, leds);

 	mc13xxx_lock(mcdev);
 	for (i = 0; i < devtype->num_regs; i++) {
 		reg = pdata->led_control[i];
 		WARN_ON(reg >= (1 << 24));
 		ret = mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), reg);
 		if (ret)
 			break;
 	}
 	mc13xxx_unlock(mcdev);

 	if (ret) {
 		dev_err(&pdev->dev, "Unable to init LED driver\n");
 		return ret;
 	}

 	for (i = 0; i < num_leds; i++) {
 		const char *name, *trig;
 		char max_current;

 		ret = -EINVAL;

 		id = pdata->led[i].id;
 		name = pdata->led[i].name;
 		trig = pdata->led[i].default_trigger;
 		max_current = pdata->led[i].max_current;

 		if ((id > devtype->led_max) || (id < devtype->led_min)) {
 			dev_err(&pdev->dev, "Invalid ID %i\n", id);
 			break;
 		}

 		if (init_led & (1 << id)) {
 			dev_warn(&pdev->dev,
 				 "LED %i already initialized\n", id);
 			break;
 		}

 		init_led |= 1 << id;
 		leds->led[i].id = id;
 		leds->led[i].master = mcdev;
 		leds->led[i].cdev.name = name;
 		leds->led[i].cdev.default_trigger = trig;
 		leds->led[i].cdev.brightness_set = mc13xxx_led_set;
 		leds->led[i].cdev.brightness = LED_OFF;

 		INIT_WORK(&leds->led[i].work, mc13xxx_led_work);

 		ret = mc13xxx_led_setup(&leds->led[i], max_current);
 		if (ret) {
 			dev_err(&pdev->dev, "Unable to setup LED %i\n", id);
 			break;
 		}
 		ret = led_classdev_register(pdev->dev.parent,
 					    &leds->led[i].cdev);
 		if (ret) {
 			dev_err(&pdev->dev, "Failed to register LED %i\n", id);
 			break;
 		}
 	}

 	if (ret)
 		while (--i >= 0) {
 			led_classdev_unregister(&leds->led[i].cdev);
 			cancel_work_sync(&leds->led[i].work);
 		}

 	return ret;
 }

 static int mc13xxx_led_remove(struct platform_device *pdev)
 {
 	struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
 	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
 	int i;

 	for (i = 0; i < leds->num_leds; i++) {
 		led_classdev_unregister(&leds->led[i].cdev);
 		cancel_work_sync(&leds->led[i].work);
 	}

 	mc13xxx_lock(mcdev);
 	for (i = 0; i < leds->devtype->num_regs; i++)
 		mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), 0);
 	mc13xxx_unlock(mcdev);

 	return 0;
 }

 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
 	.led_min	= MC13783_LED_MD,
 	.led_max	= MC13783_LED_B3,
 	.num_regs	= 6,
 };

 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
 	.led_min	= MC13892_LED_MD,
 	.led_max	= MC13892_LED_B,
 	.num_regs	= 4,
 };

 static const struct platform_device_id mc13xxx_led_id_table[] = {
 	{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
 	{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
 	{ }
 };
 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);

 static struct platform_driver mc13xxx_led_driver = {
 	.driver	= {
 		.name	= "mc13xxx-led",
 		.owner	= THIS_MODULE,
 	},
 	.remove		= mc13xxx_led_remove,
 	.id_table	= mc13xxx_led_id_table,
 };
 module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);

 MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
 MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
 MODULE_LICENSE("GPL");
	/*
	* LEDs driver for Freescale MC13783/MC13892
	*
	* Copyright (C) 2010 Philippe Rétornaz
	*
	* Based on leds-da903x:
	* Copyright (C) 2008 Compulab, Ltd.
	* Mike Rapoport <mike@compulab.co.il>
	*
	* Copyright (C) 2006-2008 Marvell International Ltd.
	* Eric Miao <eric.miao@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/module.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/leds.h>
	#include <linux/workqueue.h>
	#include <linux/mfd/mc13xxx.h>

	#define MC13XXX_REG_LED_CONTROL(x) (51 + (x))

	struct mc13xxx_led_devtype {
	int led_min;
	int led_max;
	int num_regs;
	};

	struct mc13xxx_led {
	struct led_classdev cdev;
	struct work_struct work;
	struct mc13xxx *master;
	enum led_brightness new_brightness;
	int id;
	};

	struct mc13xxx_leds {
	struct mc13xxx_led_devtype *devtype;
	int num_leds;
	struct mc13xxx_led led[0];
	};

	static void mc13xxx_led_work(struct work_struct *work)
	{
	struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
	int reg, mask, value, bank, off, shift;

	switch (led->id) {
	case MC13783_LED_MD:
	reg = MC13XXX_REG_LED_CONTROL(2);
	shift = 9;
	mask = 0x0f;
	value = led->new_brightness >> 4;
	break;
	case MC13783_LED_AD:
	reg = MC13XXX_REG_LED_CONTROL(2);
	shift = 13;
	mask = 0x0f;
	value = led->new_brightness >> 4;
	break;
	case MC13783_LED_KP:
	reg = MC13XXX_REG_LED_CONTROL(2);
	shift = 17;
	mask = 0x0f;
	value = led->new_brightness >> 4;
	break;
	case MC13783_LED_R1:
	case MC13783_LED_G1:
	case MC13783_LED_B1:
	case MC13783_LED_R2:
	case MC13783_LED_G2:
	case MC13783_LED_B2:
	case MC13783_LED_R3:
	case MC13783_LED_G3:
	case MC13783_LED_B3:
	off = led->id - MC13783_LED_R1;
	bank = off / 3;
	reg = MC13XXX_REG_LED_CONTROL(3) + bank;
	shift = (off - bank * 3) * 5 + 6;
	value = led->new_brightness >> 3;
	mask = 0x1f;
	break;
	case MC13892_LED_MD:
	reg = MC13XXX_REG_LED_CONTROL(0);
	shift = 3;
	mask = 0x3f;
	value = led->new_brightness >> 2;
	break;
	case MC13892_LED_AD:
	reg = MC13XXX_REG_LED_CONTROL(0);
	shift = 15;
	mask = 0x3f;
	value = led->new_brightness >> 2;
	break;
	case MC13892_LED_KP:
	reg = MC13XXX_REG_LED_CONTROL(1);
	shift = 3;
	mask = 0x3f;
	value = led->new_brightness >> 2;
	break;
	case MC13892_LED_R:
	case MC13892_LED_G:
	case MC13892_LED_B:
	off = led->id - MC13892_LED_R;
	bank = off / 2;
	reg = MC13XXX_REG_LED_CONTROL(2) + bank;
	shift = (off - bank * 2) * 12 + 3;
	value = led->new_brightness >> 2;
	mask = 0x3f;
	break;
	default:
	BUG();
	}

	mc13xxx_lock(led->master);
	mc13xxx_reg_rmw(led->master, reg, mask << shift, value << shift);
	mc13xxx_unlock(led->master);
	}

	static void mc13xxx_led_set(struct led_classdev *led_cdev,
	enum led_brightness value)
	{
	struct mc13xxx_led *led =
	container_of(led_cdev, struct mc13xxx_led, cdev);

	led->new_brightness = value;
	schedule_work(&led->work);
	}

	static int __init mc13xxx_led_setup(struct mc13xxx_led *led, int max_current)
	{
	int shift, mask, reg, ret, bank;

	switch (led->id) {
	case MC13783_LED_MD:
	reg = MC13XXX_REG_LED_CONTROL(2);
	shift = 0;
	mask = 0x07;
	break;
	case MC13783_LED_AD:
	reg = MC13XXX_REG_LED_CONTROL(2);
	shift = 3;
	mask = 0x07;
	break;
	case MC13783_LED_KP:
	reg = MC13XXX_REG_LED_CONTROL(2);
	shift = 6;
	mask = 0x07;
	break;
	case MC13783_LED_R1:
	case MC13783_LED_G1:
	case MC13783_LED_B1:
	case MC13783_LED_R2:
	case MC13783_LED_G2:
	case MC13783_LED_B2:
	case MC13783_LED_R3:
	case MC13783_LED_G3:
	case MC13783_LED_B3:
	bank = (led->id - MC13783_LED_R1) / 3;
	reg = MC13XXX_REG_LED_CONTROL(3) + bank;
	shift = ((led->id - MC13783_LED_R1) - bank * 3) * 2;
	mask = 0x03;
	break;
	case MC13892_LED_MD:
	reg = MC13XXX_REG_LED_CONTROL(0);
	shift = 9;
	mask = 0x07;
	break;
	case MC13892_LED_AD:
	reg = MC13XXX_REG_LED_CONTROL(0);
	shift = 21;
	mask = 0x07;
	break;
	case MC13892_LED_KP:
	reg = MC13XXX_REG_LED_CONTROL(1);
	shift = 9;
	mask = 0x07;
	break;
	case MC13892_LED_R:
	case MC13892_LED_G:
	case MC13892_LED_B:
	bank = (led->id - MC13892_LED_R) / 2;
	reg = MC13XXX_REG_LED_CONTROL(2) + bank;
	shift = ((led->id - MC13892_LED_R) - bank * 2) * 12 + 9;
	mask = 0x07;
	break;
	default:
	BUG();
	}

	mc13xxx_lock(led->master);
	ret = mc13xxx_reg_rmw(led->master, reg, mask << shift,
	max_current << shift);
	mc13xxx_unlock(led->master);

	return ret;
	}

	static int __init mc13xxx_led_probe(struct platform_device *pdev)
	{
	struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
	struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
	struct mc13xxx_led_devtype *devtype =
	(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
	struct mc13xxx_leds *leds;
	int i, id, num_leds, ret = -ENODATA;
	u32 reg, init_led = 0;

	if (!pdata) {
	dev_err(&pdev->dev, "Missing platform data\n");
	return -ENODEV;
	}

	num_leds = pdata->num_leds;

	if ((num_leds < 1) \|\|
	(num_leds > (devtype->led_max - devtype->led_min + 1))) {
	dev_err(&pdev->dev, "Invalid LED count %d\n", num_leds);
	return -EINVAL;
	}

	leds = devm_kzalloc(&pdev->dev, num_leds * sizeof(struct mc13xxx_led) +
	sizeof(struct mc13xxx_leds), GFP_KERNEL);
	if (!leds)
	return -ENOMEM;

	leds->devtype = devtype;
	leds->num_leds = num_leds;
	platform_set_drvdata(pdev, leds);

	mc13xxx_lock(mcdev);
	for (i = 0; i < devtype->num_regs; i++) {
	reg = pdata->led_control[i];
	WARN_ON(reg >= (1 << 24));
	ret = mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), reg);
	if (ret)
	break;
	}
	mc13xxx_unlock(mcdev);

	if (ret) {
	dev_err(&pdev->dev, "Unable to init LED driver\n");
	return ret;
	}

	for (i = 0; i < num_leds; i++) {
	const char name, trig;
	char max_current;

	ret = -EINVAL;

	id = pdata->led[i].id;
	name = pdata->led[i].name;
	trig = pdata->led[i].default_trigger;
	max_current = pdata->led[i].max_current;

	if ((id > devtype->led_max) \|\| (id < devtype->led_min)) {
	dev_err(&pdev->dev, "Invalid ID %i\n", id);
	break;
	}

	if (init_led & (1 << id)) {
	dev_warn(&pdev->dev,
	"LED %i already initialized\n", id);
	break;
	}

	init_led \|= 1 << id;
	leds->led[i].id = id;
	leds->led[i].master = mcdev;
	leds->led[i].cdev.name = name;
	leds->led[i].cdev.default_trigger = trig;
	leds->led[i].cdev.brightness_set = mc13xxx_led_set;
	leds->led[i].cdev.brightness = LED_OFF;

	INIT_WORK(&leds->led[i].work, mc13xxx_led_work);

	ret = mc13xxx_led_setup(&leds->led[i], max_current);
	if (ret) {
	dev_err(&pdev->dev, "Unable to setup LED %i\n", id);
	break;
	}
	ret = led_classdev_register(pdev->dev.parent,
	&leds->led[i].cdev);
	if (ret) {
	dev_err(&pdev->dev, "Failed to register LED %i\n", id);
	break;
	}
	}

	if (ret)
	while (--i >= 0) {
	led_classdev_unregister(&leds->led[i].cdev);
	cancel_work_sync(&leds->led[i].work);
	}

	return ret;
	}

	static int mc13xxx_led_remove(struct platform_device *pdev)
	{
	struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent);
	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < leds->num_leds; i++) {
	led_classdev_unregister(&leds->led[i].cdev);
	cancel_work_sync(&leds->led[i].work);
	}

	mc13xxx_lock(mcdev);
	for (i = 0; i < leds->devtype->num_regs; i++)
	mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), 0);
	mc13xxx_unlock(mcdev);

	return 0;
	}

	static const struct mc13xxx_led_devtype mc13783_led_devtype = {
	.led_min = MC13783_LED_MD,
	.led_max = MC13783_LED_B3,
	.num_regs = 6,
	};

	static const struct mc13xxx_led_devtype mc13892_led_devtype = {
	.led_min = MC13892_LED_MD,
	.led_max = MC13892_LED_B,
	.num_regs = 4,
	};

	static const struct platform_device_id mc13xxx_led_id_table[] = {
	{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
	{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
	{ }
	};
	MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);

	static struct platform_driver mc13xxx_led_driver = {
	.driver = {
	.name = "mc13xxx-led",
	.owner = THIS_MODULE,
	},
	.remove = mc13xxx_led_remove,
	.id_table = mc13xxx_led_id_table,
	};
	module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);

	MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
	MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
	MODULE_LICENSE("GPL");