[people/arne_f/kernel.git] / drivers / leds / leds-mc13783.c

/*
 * 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/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;
	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 int mc13xxx_led_set(struct led_classdev *led_cdev,
			    enum led_brightness value)
{
	struct mc13xxx_led *led =
		container_of(led_cdev, struct mc13xxx_led, cdev);
	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:
		off = led->id - MC13892_LED_MD;
		reg = off / 2;
		shift = 3 + (off - reg * 2) * 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();
	}

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

#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);

	parent = of_get_child_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_blocking = mc13xxx_led_set;
		leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);

		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);

	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);

	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");
Commit	Line	Data
7fdcef8a	1	/*
a59ce658	2	* LEDs driver for Freescale MC13783/MC13892/MC34708
7fdcef8a PR	3	*
	4	* Copyright (C) 2010 Philippe Rétornaz
	5	*
	6	* Based on leds-da903x:
	7	* Copyright (C) 2008 Compulab, Ltd.
	8	* Mike Rapoport <mike@compulab.co.il>
	9	*
	10	* Copyright (C) 2006-2008 Marvell International Ltd.
	11	* Eric Miao <eric.miao@marvell.com>
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License version 2 as
	15	* published by the Free Software Foundation.
	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/kernel.h>
7fdcef8a PR	20	#include <linux/platform_device.h>
7fdcef8a PR	21	#include <linux/leds.h>
25c6579f	22	#include <linux/of.h>
f3ca0782	23	#include <linux/mfd/mc13xxx.h>
7fdcef8a	24
9d263813 AS	25	struct mc13xxx_led_devtype {
	26	int led_min;
	27	int led_max;
	28	int num_regs;
a59ce658	29	u32 ledctrl_base;
9d263813 AS	30	};
	31
	32	struct mc13xxx_led {
7fdcef8a	33	struct led_classdev cdev;
7fdcef8a	34	int id;
a59ce658	35	struct mc13xxx_leds *leds;
7fdcef8a PR	36	};
7fdcef8a PR	37
9d263813	38	struct mc13xxx_leds {
a59ce658	39	struct mc13xxx *master;
9d263813 AS	40	struct mc13xxx_led_devtype *devtype;
9d263813 AS	41	int num_leds;
25c6579f	42	struct mc13xxx_led *led;
9d263813 AS	43	};
9d263813 AS	44
677d13f2 AS	45	static unsigned int mc13xxx_max_brightness(int id)
	46	{
	47	if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
	48	return 0x0f;
	49	else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
	50	return 0x1f;
	51
	52	return 0x3f;
	53	}
	54
4330f2f2 AL	55	static int mc13xxx_led_set(struct led_classdev *led_cdev,
4330f2f2 AL	56	enum led_brightness value)
7fdcef8a	57	{
4330f2f2 AL	58	struct mc13xxx_led *led =
4330f2f2 AL	59	container_of(led_cdev, struct mc13xxx_led, cdev);
a59ce658	60	struct mc13xxx_leds *leds = led->leds;
677d13f2	61	unsigned int reg, bank, off, shift;
7fdcef8a PR	62
	63	switch (led->id) {
	64	case MC13783_LED_MD:
7fdcef8a	65	case MC13783_LED_AD:
7fdcef8a	66	case MC13783_LED_KP:
a59ce658 AS	67	reg = 2;
a59ce658 AS	68	shift = 9 + (led->id - MC13783_LED_MD) * 4;
7fdcef8a PR	69	break;
	70	case MC13783_LED_R1:
	71	case MC13783_LED_G1:
	72	case MC13783_LED_B1:
	73	case MC13783_LED_R2:
	74	case MC13783_LED_G2:
	75	case MC13783_LED_B2:
	76	case MC13783_LED_R3:
	77	case MC13783_LED_G3:
	78	case MC13783_LED_B3:
	79	off = led->id - MC13783_LED_R1;
9d263813	80	bank = off / 3;
a59ce658	81	reg = 3 + bank;
9d263813	82	shift = (off - bank * 3) * 5 + 6;
7fdcef8a	83	break;
ae6cdb03	84	case MC13892_LED_MD:
ae6cdb03	85	case MC13892_LED_AD:
ae6cdb03	86	case MC13892_LED_KP:
cce35f35 AK	87	off = led->id - MC13892_LED_MD;
	88	reg = off / 2;
	89	shift = 3 + (off - reg * 2) * 12;
ae6cdb03 AS	90	break;
	91	case MC13892_LED_R:
	92	case MC13892_LED_G:
	93	case MC13892_LED_B:
	94	off = led->id - MC13892_LED_R;
	95	bank = off / 2;
a59ce658	96	reg = 2 + bank;
ae6cdb03	97	shift = (off - bank * 2) * 12 + 3;
ae6cdb03	98	break;
a59ce658 AS	99	case MC34708_LED_R:
	100	case MC34708_LED_G:
	101	reg = 0;
	102	shift = 3 + (led->id - MC34708_LED_R) * 12;
a59ce658	103	break;
9d263813 AS	104	default:
9d263813 AS	105	BUG();
7fdcef8a PR	106	}
7fdcef8a PR	107
4330f2f2	108	return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
677d13f2	109	mc13xxx_max_brightness(led->id) << shift,
4330f2f2	110	value << shift);
7fdcef8a PR	111	}
7fdcef8a PR	112
25c6579f AS	113	#ifdef CONFIG_OF
	114	static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
	115	struct platform_device *pdev)
	116	{
	117	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
	118	struct mc13xxx_leds_platform_data *pdata;
	119	struct device_node parent, child;
	120	struct device *dev = &pdev->dev;
	121	int i = 0, ret = -ENODATA;
	122
	123	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	124	if (!pdata)
	125	return ERR_PTR(-ENOMEM);
	126
452bc149	127	parent = of_get_child_by_name(dev->parent->of_node, "leds");
25c6579f AS	128	if (!parent)
	129	goto out_node_put;
	130
	131	ret = of_property_read_u32_array(parent, "led-control",
	132	pdata->led_control,
	133	leds->devtype->num_regs);
	134	if (ret)
	135	goto out_node_put;
	136
	137	pdata->num_leds = of_get_child_count(parent);
	138
	139	pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
	140	GFP_KERNEL);
	141	if (!pdata->led) {
	142	ret = -ENOMEM;
	143	goto out_node_put;
	144	}
	145
	146	for_each_child_of_node(parent, child) {
	147	const char *str;
	148	u32 tmp;
	149
	150	if (of_property_read_u32(child, "reg", &tmp))
	151	continue;
	152	pdata->led[i].id = leds->devtype->led_min + tmp;
	153
	154	if (!of_property_read_string(child, "label", &str))
	155	pdata->led[i].name = str;
	156	if (!of_property_read_string(child, "linux,default-trigger",
	157	&str))
	158	pdata->led[i].default_trigger = str;
	159
	160	i++;
	161	}
	162
	163	pdata->num_leds = i;
	164	ret = i > 0 ? 0 : -ENODATA;
	165
	166	out_node_put:
	167	of_node_put(parent);
	168
	169	return ret ? ERR_PTR(ret) : pdata;
	170	}
	171	#else
	172	static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
	173	struct platform_device *pdev)
	174	{
	175	return ERR_PTR(-ENOSYS);
	176	}
	177	#endif
	178
9d263813	179	static int __init mc13xxx_led_probe(struct platform_device *pdev)
7fdcef8a	180	{
a59ce658 AS	181	struct device *dev = &pdev->dev;
	182	struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
	183	struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
9d263813 AS	184	struct mc13xxx_led_devtype *devtype =
	185	(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
	186	struct mc13xxx_leds *leds;
25c6579f	187	int i, id, ret = -ENODATA;
a59ce658	188	u32 init_led = 0;
9d263813	189
25c6579f	190	leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
9d263813	191	if (!leds)
7fdcef8a	192	return -ENOMEM;
9d263813 AS	193
9d263813 AS	194	leds->devtype = devtype;
a59ce658	195	leds->master = mcdev;
9d263813 AS	196	platform_set_drvdata(pdev, leds);
9d263813 AS	197
25c6579f AS	198	if (dev->parent->of_node) {
	199	pdata = mc13xxx_led_probe_dt(pdev);
	200	if (IS_ERR(pdata))
	201	return PTR_ERR(pdata);
	202	} else if (!pdata)
	203	return -ENODATA;
	204
	205	leds->num_leds = pdata->num_leds;
	206
	207	if ((leds->num_leds < 1) \|\|
	208	(leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
	209	dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
	210	return -EINVAL;
	211	}
	212
	213	leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
	214	GFP_KERNEL);
	215	if (!leds->led)
	216	return -ENOMEM;
	217
9d263813	218	for (i = 0; i < devtype->num_regs; i++) {
a59ce658 AS	219	ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
a59ce658 AS	220	pdata->led_control[i]);
9d263813	221	if (ret)
3df22c06	222	return ret;
7fdcef8a PR	223	}
7fdcef8a PR	224
25c6579f	225	for (i = 0; i < leds->num_leds; i++) {
9d263813	226	const char name, trig;
7fdcef8a	227
9d263813 AS	228	ret = -EINVAL;
	229
	230	id = pdata->led[i].id;
	231	name = pdata->led[i].name;
	232	trig = pdata->led[i].default_trigger;
9d263813 AS	233
9d263813 AS	234	if ((id > devtype->led_max) \|\| (id < devtype->led_min)) {
a59ce658	235	dev_err(dev, "Invalid ID %i\n", id);
9d263813	236	break;
7fdcef8a PR	237	}
7fdcef8a PR	238
9d263813	239	if (init_led & (1 << id)) {
a59ce658	240	dev_warn(dev, "LED %i already initialized\n", id);
9d263813	241	break;
7fdcef8a PR	242	}
7fdcef8a PR	243
9d263813 AS	244	init_led \|= 1 << id;
9d263813 AS	245	leds->led[i].id = id;
a59ce658	246	leds->led[i].leds = leds;
9d263813 AS	247	leds->led[i].cdev.name = name;
9d263813 AS	248	leds->led[i].cdev.default_trigger = trig;
02e9e11e	249	leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
4330f2f2	250	leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
677d13f2	251	leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
7fdcef8a	252
a59ce658	253	ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
7fdcef8a	254	if (ret) {
a59ce658	255	dev_err(dev, "Failed to register LED %i\n", id);
9d263813	256	break;
7fdcef8a PR	257	}
	258	}
	259
9d263813	260	if (ret)
4330f2f2	261	while (--i >= 0)
9d263813	262	led_classdev_unregister(&leds->led[i].cdev);
7fdcef8a	263
7fdcef8a PR	264	return ret;
	265	}
	266
9d263813	267	static int mc13xxx_led_remove(struct platform_device *pdev)
7fdcef8a	268	{
9d263813	269	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
7fdcef8a PR	270	int i;
7fdcef8a PR	271
4330f2f2	272	for (i = 0; i < leds->num_leds; i++)
9d263813	273	led_classdev_unregister(&leds->led[i].cdev);
7fdcef8a	274
7fdcef8a PR	275	return 0;
	276	}
	277
9d263813 AS	278	static const struct mc13xxx_led_devtype mc13783_led_devtype = {
	279	.led_min = MC13783_LED_MD,
	280	.led_max = MC13783_LED_B3,
	281	.num_regs = 6,
a59ce658	282	.ledctrl_base = 51,
9d263813 AS	283	};
9d263813 AS	284
ae6cdb03 AS	285	static const struct mc13xxx_led_devtype mc13892_led_devtype = {
	286	.led_min = MC13892_LED_MD,
	287	.led_max = MC13892_LED_B,
	288	.num_regs = 4,
a59ce658 AS	289	.ledctrl_base = 51,
	290	};
	291
	292	static const struct mc13xxx_led_devtype mc34708_led_devtype = {
	293	.led_min = MC34708_LED_R,
	294	.led_max = MC34708_LED_G,
	295	.num_regs = 1,
	296	.ledctrl_base = 54,
ae6cdb03 AS	297	};
ae6cdb03 AS	298
9d263813 AS	299	static const struct platform_device_id mc13xxx_led_id_table[] = {
9d263813 AS	300	{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
ae6cdb03	301	{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
a59ce658	302	{ "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
9d263813 AS	303	{ }
	304	};
	305	MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
	306
	307	static struct platform_driver mc13xxx_led_driver = {
7fdcef8a	308	.driver = {
9d263813	309	.name = "mc13xxx-led",
7fdcef8a	310	},
9d263813 AS	311	.remove = mc13xxx_led_remove,
9d263813 AS	312	.id_table = mc13xxx_led_id_table,
7fdcef8a	313	};
9d263813	314	module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
7fdcef8a	315
9d263813	316	MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
7fdcef8a PR	317	MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
7fdcef8a PR	318	MODULE_LICENSE("GPL");