drivers/leds/leds-mc13783.c - kernel/bruno - Git at Google

 /*
  * LEDs driver for Freescale MC13783/MC13892/MC34708
  *
  * 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/platform_device.h>
 #include <linux/leds.h>
 #include <linux/of.h>
 #include <linux/workqueue.h>
 #include <linux/mfd/mc13xxx.h>

 struct mc13xxx_led_devtype {
 	int	led_min;
 	int	led_max;
 	int	num_regs;
 	u32	ledctrl_base;
 };

 struct mc13xxx_led {
 	struct led_classdev	cdev;
 	struct work_struct	work;
 	enum led_brightness	new_brightness;
 	int			id;
 	struct mc13xxx_leds	*leds;
 };

 struct mc13xxx_leds {
 	struct mc13xxx			*master;
 	struct mc13xxx_led_devtype	*devtype;
 	int				num_leds;
 	struct mc13xxx_led		*led;
 };

 static unsigned int mc13xxx_max_brightness(int id)
 {
 	if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
 		return 0x0f;
 	else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
 		return 0x1f;

 	return 0x3f;
 }

 static void mc13xxx_led_work(struct work_struct *work)
 {
 	struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
 	struct mc13xxx_leds *leds = led->leds;
 	unsigned int reg, bank, off, shift;

 	switch (led->id) {
 	case MC13783_LED_MD:
 	case MC13783_LED_AD:
 	case MC13783_LED_KP:
 		reg = 2;
 		shift = 9 + (led->id - MC13783_LED_MD) * 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 = 3 + bank;
 		shift = (off - bank * 3) * 5 + 6;
 		break;
 	case MC13892_LED_MD:
 	case MC13892_LED_AD:
 	case MC13892_LED_KP:
 		reg = (led->id - MC13892_LED_MD) / 2;
 		shift = 3 + (led->id - MC13892_LED_MD) * 12;
 		break;
 	case MC13892_LED_R:
 	case MC13892_LED_G:
 	case MC13892_LED_B:
 		off = led->id - MC13892_LED_R;
 		bank = off / 2;
 		reg = 2 + bank;
 		shift = (off - bank * 2) * 12 + 3;
 		break;
 	case MC34708_LED_R:
 	case MC34708_LED_G:
 		reg = 0;
 		shift = 3 + (led->id - MC34708_LED_R) * 12;
 		break;
 	default:
 		BUG();
 	}

 	mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
 			mc13xxx_max_brightness(led->id) << shift,
 			led->new_brightness << shift);
 }

 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);
 }

 #ifdef CONFIG_OF
 static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 	struct platform_device *pdev)
 {
 	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
 	struct mc13xxx_leds_platform_data *pdata;
 	struct device_node *parent, *child;
 	struct device *dev = &pdev->dev;
 	int i = 0, ret = -ENODATA;

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return ERR_PTR(-ENOMEM);

 	of_node_get(dev->parent->of_node);

 	parent = of_find_node_by_name(dev->parent->of_node, "leds");
 	if (!parent)
 		goto out_node_put;

 	ret = of_property_read_u32_array(parent, "led-control",
 					 pdata->led_control,
 					 leds->devtype->num_regs);
 	if (ret)
 		goto out_node_put;

 	pdata->num_leds = of_get_child_count(parent);

 	pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
 				  GFP_KERNEL);
 	if (!pdata->led) {
 		ret = -ENOMEM;
 		goto out_node_put;
 	}

 	for_each_child_of_node(parent, child) {
 		const char *str;
 		u32 tmp;

 		if (of_property_read_u32(child, "reg", &tmp))
 			continue;
 		pdata->led[i].id = leds->devtype->led_min + tmp;

 		if (!of_property_read_string(child, "label", &str))
 			pdata->led[i].name = str;
 		if (!of_property_read_string(child, "linux,default-trigger",
 					     &str))
 			pdata->led[i].default_trigger = str;

 		i++;
 	}

 	pdata->num_leds = i;
 	ret = i > 0 ? 0 : -ENODATA;

 out_node_put:
 	of_node_put(parent);

 	return ret ? ERR_PTR(ret) : pdata;
 }
 #else
 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 	struct platform_device *pdev)
 {
 	return ERR_PTR(-ENOSYS);
 }
 #endif

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

 	leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
 	if (!leds)
 		return -ENOMEM;

 	leds->devtype = devtype;
 	leds->master = mcdev;
 	platform_set_drvdata(pdev, leds);

 	if (dev->parent->of_node) {
 		pdata = mc13xxx_led_probe_dt(pdev);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 	} else if (!pdata)
 		return -ENODATA;

 	leds->num_leds = pdata->num_leds;

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

 	leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
 				 GFP_KERNEL);
 	if (!leds->led)
 		return -ENOMEM;

 	for (i = 0; i < devtype->num_regs; i++) {
 		ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
 					pdata->led_control[i]);
 		if (ret)
 			return ret;
 	}

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

 		ret = -EINVAL;

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

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

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

 		init_led |= 1 << id;
 		leds->led[i].id = id;
 		leds->led[i].leds = leds;
 		leds->led[i].cdev.name = name;
 		leds->led[i].cdev.default_trigger = trig;
 		leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
 		leds->led[i].cdev.brightness_set = mc13xxx_led_set;
 		leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);

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

 		ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
 		if (ret) {
 			dev_err(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_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);
 	}

 	return 0;
 }

 static const struct mc13xxx_led_devtype mc13783_led_devtype = {
 	.led_min	= MC13783_LED_MD,
 	.led_max	= MC13783_LED_B3,
 	.num_regs	= 6,
 	.ledctrl_base	= 51,
 };

 static const struct mc13xxx_led_devtype mc13892_led_devtype = {
 	.led_min	= MC13892_LED_MD,
 	.led_max	= MC13892_LED_B,
 	.num_regs	= 4,
 	.ledctrl_base	= 51,
 };

 static const struct mc13xxx_led_devtype mc34708_led_devtype = {
 	.led_min	= MC34708_LED_R,
 	.led_max	= MC34708_LED_G,
 	.num_regs	= 1,
 	.ledctrl_base	= 54,
 };

 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, },
 	{ "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
 	{ }
 };
 MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);

 static struct platform_driver mc13xxx_led_driver = {
 	.driver	= {
 		.name	= "mc13xxx-led",
 	},
 	.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/MC34708
	*
	* 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/platform_device.h>
	#include <linux/leds.h>
	#include <linux/of.h>
	#include <linux/workqueue.h>
	#include <linux/mfd/mc13xxx.h>

	struct mc13xxx_led_devtype {
	int led_min;
	int led_max;
	int num_regs;
	u32 ledctrl_base;
	};

	struct mc13xxx_led {
	struct led_classdev cdev;
	struct work_struct work;
	enum led_brightness new_brightness;
	int id;
	struct mc13xxx_leds *leds;
	};

	struct mc13xxx_leds {
	struct mc13xxx *master;
	struct mc13xxx_led_devtype *devtype;
	int num_leds;
	struct mc13xxx_led *led;
	};

	static unsigned int mc13xxx_max_brightness(int id)
	{
	if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
	return 0x0f;
	else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
	return 0x1f;

	return 0x3f;
	}

	static void mc13xxx_led_work(struct work_struct *work)
	{
	struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
	struct mc13xxx_leds *leds = led->leds;
	unsigned int reg, bank, off, shift;

	switch (led->id) {
	case MC13783_LED_MD:
	case MC13783_LED_AD:
	case MC13783_LED_KP:
	reg = 2;
	shift = 9 + (led->id - MC13783_LED_MD) * 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 = 3 + bank;
	shift = (off - bank * 3) * 5 + 6;
	break;
	case MC13892_LED_MD:
	case MC13892_LED_AD:
	case MC13892_LED_KP:
	reg = (led->id - MC13892_LED_MD) / 2;
	shift = 3 + (led->id - MC13892_LED_MD) * 12;
	break;
	case MC13892_LED_R:
	case MC13892_LED_G:
	case MC13892_LED_B:
	off = led->id - MC13892_LED_R;
	bank = off / 2;
	reg = 2 + bank;
	shift = (off - bank * 2) * 12 + 3;
	break;
	case MC34708_LED_R:
	case MC34708_LED_G:
	reg = 0;
	shift = 3 + (led->id - MC34708_LED_R) * 12;
	break;
	default:
	BUG();
	}

	mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
	mc13xxx_max_brightness(led->id) << shift,
	led->new_brightness << shift);
	}

	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);
	}

	#ifdef CONFIG_OF
	static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
	struct platform_device *pdev)
	{
	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
	struct mc13xxx_leds_platform_data *pdata;
	struct device_node parent, child;
	struct device *dev = &pdev->dev;
	int i = 0, ret = -ENODATA;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return ERR_PTR(-ENOMEM);

	of_node_get(dev->parent->of_node);

	parent = of_find_node_by_name(dev->parent->of_node, "leds");
	if (!parent)
	goto out_node_put;

	ret = of_property_read_u32_array(parent, "led-control",
	pdata->led_control,
	leds->devtype->num_regs);
	if (ret)
	goto out_node_put;

	pdata->num_leds = of_get_child_count(parent);

	pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
	GFP_KERNEL);
	if (!pdata->led) {
	ret = -ENOMEM;
	goto out_node_put;
	}

	for_each_child_of_node(parent, child) {
	const char *str;
	u32 tmp;

	if (of_property_read_u32(child, "reg", &tmp))
	continue;
	pdata->led[i].id = leds->devtype->led_min + tmp;

	if (!of_property_read_string(child, "label", &str))
	pdata->led[i].name = str;
	if (!of_property_read_string(child, "linux,default-trigger",
	&str))
	pdata->led[i].default_trigger = str;

	i++;
	}

	pdata->num_leds = i;
	ret = i > 0 ? 0 : -ENODATA;

	out_node_put:
	of_node_put(parent);

	return ret ? ERR_PTR(ret) : pdata;
	}
	#else
	static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
	struct platform_device *pdev)
	{
	return ERR_PTR(-ENOSYS);
	}
	#endif

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

	leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
	if (!leds)
	return -ENOMEM;

	leds->devtype = devtype;
	leds->master = mcdev;
	platform_set_drvdata(pdev, leds);

	if (dev->parent->of_node) {
	pdata = mc13xxx_led_probe_dt(pdev);
	if (IS_ERR(pdata))
	return PTR_ERR(pdata);
	} else if (!pdata)
	return -ENODATA;

	leds->num_leds = pdata->num_leds;

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

	leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
	GFP_KERNEL);
	if (!leds->led)
	return -ENOMEM;

	for (i = 0; i < devtype->num_regs; i++) {
	ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
	pdata->led_control[i]);
	if (ret)
	return ret;
	}

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

	ret = -EINVAL;

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

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

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

	init_led \|= 1 << id;
	leds->led[i].id = id;
	leds->led[i].leds = leds;
	leds->led[i].cdev.name = name;
	leds->led[i].cdev.default_trigger = trig;
	leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
	leds->led[i].cdev.brightness_set = mc13xxx_led_set;
	leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);

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

	ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
	if (ret) {
	dev_err(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_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);
	}

	return 0;
	}

	static const struct mc13xxx_led_devtype mc13783_led_devtype = {
	.led_min = MC13783_LED_MD,
	.led_max = MC13783_LED_B3,
	.num_regs = 6,
	.ledctrl_base = 51,
	};

	static const struct mc13xxx_led_devtype mc13892_led_devtype = {
	.led_min = MC13892_LED_MD,
	.led_max = MC13892_LED_B,
	.num_regs = 4,
	.ledctrl_base = 51,
	};

	static const struct mc13xxx_led_devtype mc34708_led_devtype = {
	.led_min = MC34708_LED_R,
	.led_max = MC34708_LED_G,
	.num_regs = 1,
	.ledctrl_base = 54,
	};

	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, },
	{ "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
	{ }
	};
	MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);

	static struct platform_driver mc13xxx_led_driver = {
	.driver = {
	.name = "mc13xxx-led",
	},
	.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");