[linux-2.6-block.git] / drivers / leds / leds-lp55xx-common.c

/*
 * LP5521/LP5523/LP55231 Common Driver
 *
 * Copyright 2012 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <milo.kim@ti.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.
 *
 * Derived from leds-lp5521.c, leds-lp5523.c
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_data/leds-lp55xx.h>

#include "leds-lp55xx-common.h"

static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev)
{
	return container_of(cdev, struct lp55xx_led, cdev);
}

static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev)
{
	return cdev_to_lp55xx_led(dev_get_drvdata(dev));
}

static void lp55xx_reset_device(struct lp55xx_chip *chip)
{
	struct lp55xx_device_config *cfg = chip->cfg;
	u8 addr = cfg->reset.addr;
	u8 val  = cfg->reset.val;

	/* no error checking here because no ACK from the device after reset */
	lp55xx_write(chip, addr, val);
}

static int lp55xx_detect_device(struct lp55xx_chip *chip)
{
	struct lp55xx_device_config *cfg = chip->cfg;
	u8 addr = cfg->enable.addr;
	u8 val  = cfg->enable.val;
	int ret;

	ret = lp55xx_write(chip, addr, val);
	if (ret)
		return ret;

	usleep_range(1000, 2000);

	ret = lp55xx_read(chip, addr, &val);
	if (ret)
		return ret;

	if (val != cfg->enable.val)
		return -ENODEV;

	return 0;
}

static int lp55xx_post_init_device(struct lp55xx_chip *chip)
{
	struct lp55xx_device_config *cfg = chip->cfg;

	if (!cfg->post_init_device)
		return 0;

	return cfg->post_init_device(chip);
}

static ssize_t lp55xx_show_current(struct device *dev,
			    struct device_attribute *attr,
			    char *buf)
{
	struct lp55xx_led *led = dev_to_lp55xx_led(dev);

	return sprintf(buf, "%d\n", led->led_current);
}

static ssize_t lp55xx_store_current(struct device *dev,
			     struct device_attribute *attr,
			     const char *buf, size_t len)
{
	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	struct lp55xx_chip *chip = led->chip;
	unsigned long curr;

	if (kstrtoul(buf, 0, &curr))
		return -EINVAL;

	if (curr > led->max_current)
		return -EINVAL;

	if (!chip->cfg->set_led_current)
		return len;

	mutex_lock(&chip->lock);
	chip->cfg->set_led_current(led, (u8)curr);
	mutex_unlock(&chip->lock);

	return len;
}

static ssize_t lp55xx_show_max_current(struct device *dev,
			    struct device_attribute *attr,
			    char *buf)
{
	struct lp55xx_led *led = dev_to_lp55xx_led(dev);

	return sprintf(buf, "%d\n", led->max_current);
}

static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, lp55xx_show_current,
		lp55xx_store_current);
static DEVICE_ATTR(max_current, S_IRUGO , lp55xx_show_max_current, NULL);

static struct attribute *lp55xx_led_attributes[] = {
	&dev_attr_led_current.attr,
	&dev_attr_max_current.attr,
	NULL,
};

static struct attribute_group lp55xx_led_attr_group = {
	.attrs = lp55xx_led_attributes
};

static void lp55xx_set_brightness(struct led_classdev *cdev,
			     enum led_brightness brightness)
{
	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);

	led->brightness = (u8)brightness;
	schedule_work(&led->brightness_work);
}

static int lp55xx_init_led(struct lp55xx_led *led,
			struct lp55xx_chip *chip, int chan)
{
	struct lp55xx_platform_data *pdata = chip->pdata;
	struct lp55xx_device_config *cfg = chip->cfg;
	struct device *dev = &chip->cl->dev;
	char name[32];
	int ret;
	int max_channel = cfg->max_channel;

	if (chan >= max_channel) {
		dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
		return -EINVAL;
	}

	if (pdata->led_config[chan].led_current == 0)
		return 0;

	led->led_current = pdata->led_config[chan].led_current;
	led->max_current = pdata->led_config[chan].max_current;
	led->chan_nr = pdata->led_config[chan].chan_nr;

	if (led->chan_nr >= max_channel) {
		dev_err(dev, "Use channel numbers between 0 and %d\n",
			max_channel - 1);
		return -EINVAL;
	}

	led->cdev.brightness_set = lp55xx_set_brightness;

	if (pdata->led_config[chan].name) {
		led->cdev.name = pdata->led_config[chan].name;
	} else {
		snprintf(name, sizeof(name), "%s:channel%d",
			pdata->label ? : chip->cl->name, chan);
		led->cdev.name = name;
	}

	/*
	 * register led class device for each channel and
	 * add device attributes
	 */

	ret = led_classdev_register(dev, &led->cdev);
	if (ret) {
		dev_err(dev, "led register err: %d\n", ret);
		return ret;
	}

	ret = sysfs_create_group(&led->cdev.dev->kobj, &lp55xx_led_attr_group);
	if (ret) {
		dev_err(dev, "led sysfs err: %d\n", ret);
		led_classdev_unregister(&led->cdev);
		return ret;
	}

	return 0;
}

int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
{
	return i2c_smbus_write_byte_data(chip->cl, reg, val);
}
EXPORT_SYMBOL_GPL(lp55xx_write);

int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val)
{
	s32 ret;

	ret = i2c_smbus_read_byte_data(chip->cl, reg);
	if (ret < 0)
		return ret;

	*val = ret;
	return 0;
}
EXPORT_SYMBOL_GPL(lp55xx_read);

int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
{
	int ret;
	u8 tmp;

	ret = lp55xx_read(chip, reg, &tmp);
	if (ret)
		return ret;

	tmp &= ~mask;
	tmp |= val & mask;

	return lp55xx_write(chip, reg, tmp);
}
EXPORT_SYMBOL_GPL(lp55xx_update_bits);

int lp55xx_init_device(struct lp55xx_chip *chip)
{
	struct lp55xx_platform_data *pdata;
	struct lp55xx_device_config *cfg;
	struct device *dev = &chip->cl->dev;
	int ret = 0;

	WARN_ON(!chip);

	pdata = chip->pdata;
	cfg = chip->cfg;

	if (!pdata || !cfg)
		return -EINVAL;

	if (pdata->setup_resources) {
		ret = pdata->setup_resources();
		if (ret < 0) {
			dev_err(dev, "setup resoure err: %d\n", ret);
			goto err;
		}
	}

	if (pdata->enable) {
		pdata->enable(0);
		usleep_range(1000, 2000); /* Keep enable down at least 1ms */
		pdata->enable(1);
		usleep_range(1000, 2000); /* 500us abs min. */
	}

	lp55xx_reset_device(chip);

	/*
	 * Exact value is not available. 10 - 20ms
	 * appears to be enough for reset.
	 */
	usleep_range(10000, 20000);

	ret = lp55xx_detect_device(chip);
	if (ret) {
		dev_err(dev, "device detection err: %d\n", ret);
		goto err;
	}

	/* chip specific initialization */
	ret = lp55xx_post_init_device(chip);
	if (ret) {
		dev_err(dev, "post init device err: %d\n", ret);
		goto err_post_init;
	}

	return 0;

err_post_init:
	lp55xx_deinit_device(chip);
err:
	return ret;
}
EXPORT_SYMBOL_GPL(lp55xx_init_device);

void lp55xx_deinit_device(struct lp55xx_chip *chip)
{
	struct lp55xx_platform_data *pdata = chip->pdata;

	if (pdata->enable)
		pdata->enable(0);

	if (pdata->release_resources)
		pdata->release_resources();
}
EXPORT_SYMBOL_GPL(lp55xx_deinit_device);

int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
{
	struct lp55xx_platform_data *pdata = chip->pdata;
	struct lp55xx_device_config *cfg = chip->cfg;
	int num_channels = pdata->num_channels;
	struct lp55xx_led *each;
	u8 led_current;
	int ret;
	int i;

	if (!cfg->brightness_work_fn) {
		dev_err(&chip->cl->dev, "empty brightness configuration\n");
		return -EINVAL;
	}

	for (i = 0; i < num_channels; i++) {

		/* do not initialize channels that are not connected */
		if (pdata->led_config[i].led_current == 0)
			continue;

		led_current = pdata->led_config[i].led_current;
		each = led + i;
		ret = lp55xx_init_led(each, chip, i);
		if (ret)
			goto err_init_led;

		INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);

		chip->num_leds++;
		each->chip = chip;

		/* setting led current at each channel */
		if (cfg->set_led_current)
			cfg->set_led_current(each, led_current);
	}

	return 0;

err_init_led:
	for (i = 0; i < chip->num_leds; i++) {
		each = led + i;
		led_classdev_unregister(&each->cdev);
		flush_work(&each->brightness_work);
	}
	return ret;
}
EXPORT_SYMBOL_GPL(lp55xx_register_leds);

MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
MODULE_DESCRIPTION("LP55xx Common Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
c93d08fa MWK	1	/*
	2	* LP5521/LP5523/LP55231 Common Driver
	3	*
	4	* Copyright 2012 Texas Instruments
	5	*
	6	* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	* Derived from leds-lp5521.c, leds-lp5523.c
	13	*/
	14
a85908dd	15	#include <linux/delay.h>
c93d08fa MWK	16	#include <linux/i2c.h>
	17	#include <linux/leds.h>
	18	#include <linux/module.h>
	19	#include <linux/platform_data/leds-lp55xx.h>
	20
	21	#include "leds-lp55xx-common.h"
	22
a6e4679a MWK	23	static struct lp55xx_led cdev_to_lp55xx_led(struct led_classdev cdev)
	24	{
	25	return container_of(cdev, struct lp55xx_led, cdev);
	26	}
	27
a96bfa13 MWK	28	static struct lp55xx_led dev_to_lp55xx_led(struct device dev)
	29	{
	30	return cdev_to_lp55xx_led(dev_get_drvdata(dev));
	31	}
	32
48068d5d MWK	33	static void lp55xx_reset_device(struct lp55xx_chip *chip)
	34	{
	35	struct lp55xx_device_config *cfg = chip->cfg;
	36	u8 addr = cfg->reset.addr;
	37	u8 val = cfg->reset.val;
	38
	39	/* no error checking here because no ACK from the device after reset */
	40	lp55xx_write(chip, addr, val);
	41	}
	42
e3a700d8 MWK	43	static int lp55xx_detect_device(struct lp55xx_chip *chip)
	44	{
	45	struct lp55xx_device_config *cfg = chip->cfg;
	46	u8 addr = cfg->enable.addr;
	47	u8 val = cfg->enable.val;
	48	int ret;
	49
	50	ret = lp55xx_write(chip, addr, val);
	51	if (ret)
	52	return ret;
	53
	54	usleep_range(1000, 2000);
	55
	56	ret = lp55xx_read(chip, addr, &val);
	57	if (ret)
	58	return ret;
	59
	60	if (val != cfg->enable.val)
	61	return -ENODEV;
	62
	63	return 0;
	64	}
	65
ffbdccdb MWK	66	static int lp55xx_post_init_device(struct lp55xx_chip *chip)
	67	{
	68	struct lp55xx_device_config *cfg = chip->cfg;
	69
	70	if (!cfg->post_init_device)
	71	return 0;
	72
	73	return cfg->post_init_device(chip);
	74	}
	75
a96bfa13 MWK	76	static ssize_t lp55xx_show_current(struct device *dev,
	77	struct device_attribute *attr,
	78	char *buf)
	79	{
	80	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	81
	82	return sprintf(buf, "%d\n", led->led_current);
	83	}
	84
	85	static ssize_t lp55xx_store_current(struct device *dev,
	86	struct device_attribute *attr,
	87	const char *buf, size_t len)
	88	{
	89	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	90	struct lp55xx_chip *chip = led->chip;
	91	unsigned long curr;
	92
	93	if (kstrtoul(buf, 0, &curr))
	94	return -EINVAL;
	95
	96	if (curr > led->max_current)
	97	return -EINVAL;
	98
	99	if (!chip->cfg->set_led_current)
	100	return len;
	101
	102	mutex_lock(&chip->lock);
	103	chip->cfg->set_led_current(led, (u8)curr);
	104	mutex_unlock(&chip->lock);
	105
	106	return len;
	107	}
	108
	109	static ssize_t lp55xx_show_max_current(struct device *dev,
	110	struct device_attribute *attr,
	111	char *buf)
	112	{
	113	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	114
	115	return sprintf(buf, "%d\n", led->max_current);
	116	}
	117
	118	static DEVICE_ATTR(led_current, S_IRUGO \| S_IWUSR, lp55xx_show_current,
	119	lp55xx_store_current);
	120	static DEVICE_ATTR(max_current, S_IRUGO , lp55xx_show_max_current, NULL);
	121
0e202346	122	static struct attribute *lp55xx_led_attributes[] = {
a96bfa13 MWK	123	&dev_attr_led_current.attr,
a96bfa13 MWK	124	&dev_attr_max_current.attr,
0e202346 MWK	125	NULL,
	126	};
	127
	128	static struct attribute_group lp55xx_led_attr_group = {
	129	.attrs = lp55xx_led_attributes
	130	};
	131
	132	static void lp55xx_set_brightness(struct led_classdev *cdev,
	133	enum led_brightness brightness)
	134	{
a6e4679a MWK	135	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
	136
	137	led->brightness = (u8)brightness;
	138	schedule_work(&led->brightness_work);
0e202346 MWK	139	}
0e202346 MWK	140
9e9b3db1 MWK	141	static int lp55xx_init_led(struct lp55xx_led *led,
	142	struct lp55xx_chip *chip, int chan)
	143	{
0e202346 MWK	144	struct lp55xx_platform_data *pdata = chip->pdata;
	145	struct lp55xx_device_config *cfg = chip->cfg;
	146	struct device *dev = &chip->cl->dev;
	147	char name[32];
	148	int ret;
	149	int max_channel = cfg->max_channel;
	150
	151	if (chan >= max_channel) {
	152	dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
	153	return -EINVAL;
	154	}
	155
	156	if (pdata->led_config[chan].led_current == 0)
	157	return 0;
	158
	159	led->led_current = pdata->led_config[chan].led_current;
	160	led->max_current = pdata->led_config[chan].max_current;
	161	led->chan_nr = pdata->led_config[chan].chan_nr;
	162
	163	if (led->chan_nr >= max_channel) {
	164	dev_err(dev, "Use channel numbers between 0 and %d\n",
	165	max_channel - 1);
	166	return -EINVAL;
	167	}
	168
	169	led->cdev.brightness_set = lp55xx_set_brightness;
	170
	171	if (pdata->led_config[chan].name) {
	172	led->cdev.name = pdata->led_config[chan].name;
	173	} else {
	174	snprintf(name, sizeof(name), "%s:channel%d",
	175	pdata->label ? : chip->cl->name, chan);
	176	led->cdev.name = name;
	177	}
	178
	179	/*
	180	* register led class device for each channel and
	181	* add device attributes
	182	*/
	183
	184	ret = led_classdev_register(dev, &led->cdev);
	185	if (ret) {
	186	dev_err(dev, "led register err: %d\n", ret);
	187	return ret;
	188	}
	189
	190	ret = sysfs_create_group(&led->cdev.dev->kobj, &lp55xx_led_attr_group);
	191	if (ret) {
	192	dev_err(dev, "led sysfs err: %d\n", ret);
	193	led_classdev_unregister(&led->cdev);
	194	return ret;
	195	}
	196
9e9b3db1 MWK	197	return 0;
	198	}
	199
c93d08fa MWK	200	int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
	201	{
	202	return i2c_smbus_write_byte_data(chip->cl, reg, val);
	203	}
	204	EXPORT_SYMBOL_GPL(lp55xx_write);
	205
	206	int lp55xx_read(struct lp55xx_chip chip, u8 reg, u8 val)
	207	{
	208	s32 ret;
	209
	210	ret = i2c_smbus_read_byte_data(chip->cl, reg);
	211	if (ret < 0)
	212	return ret;
	213
	214	*val = ret;
	215	return 0;
	216	}
	217	EXPORT_SYMBOL_GPL(lp55xx_read);
	218
	219	int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
	220	{
	221	int ret;
	222	u8 tmp;
	223
	224	ret = lp55xx_read(chip, reg, &tmp);
	225	if (ret)
	226	return ret;
	227
	228	tmp &= ~mask;
	229	tmp \|= val & mask;
	230
	231	return lp55xx_write(chip, reg, tmp);
	232	}
	233	EXPORT_SYMBOL_GPL(lp55xx_update_bits);
	234
a85908dd MWK	235	int lp55xx_init_device(struct lp55xx_chip *chip)
	236	{
	237	struct lp55xx_platform_data *pdata;
48068d5d	238	struct lp55xx_device_config *cfg;
a85908dd MWK	239	struct device *dev = &chip->cl->dev;
	240	int ret = 0;
	241
	242	WARN_ON(!chip);
	243
	244	pdata = chip->pdata;
48068d5d	245	cfg = chip->cfg;
a85908dd	246
48068d5d	247	if (!pdata \|\| !cfg)
a85908dd MWK	248	return -EINVAL;
	249
	250	if (pdata->setup_resources) {
	251	ret = pdata->setup_resources();
	252	if (ret < 0) {
	253	dev_err(dev, "setup resoure err: %d\n", ret);
	254	goto err;
	255	}
	256	}
	257
	258	if (pdata->enable) {
	259	pdata->enable(0);
	260	usleep_range(1000, 2000); /* Keep enable down at least 1ms */
	261	pdata->enable(1);
	262	usleep_range(1000, 2000); /* 500us abs min. */
	263	}
	264
48068d5d MWK	265	lp55xx_reset_device(chip);
	266
	267	/*
	268	* Exact value is not available. 10 - 20ms
	269	* appears to be enough for reset.
	270	*/
	271	usleep_range(10000, 20000);
	272
e3a700d8 MWK	273	ret = lp55xx_detect_device(chip);
	274	if (ret) {
	275	dev_err(dev, "device detection err: %d\n", ret);
	276	goto err;
	277	}
	278
ffbdccdb MWK	279	/* chip specific initialization */
ffbdccdb MWK	280	ret = lp55xx_post_init_device(chip);
22ebeb48 MWK	281	if (ret) {
	282	dev_err(dev, "post init device err: %d\n", ret);
	283	goto err_post_init;
	284	}
ffbdccdb MWK	285
	286	return 0;
	287
22ebeb48	288	err_post_init:
6ce61762 MWK	289	lp55xx_deinit_device(chip);
	290	err:
	291	return ret;
	292	}
	293	EXPORT_SYMBOL_GPL(lp55xx_init_device);
	294
	295	void lp55xx_deinit_device(struct lp55xx_chip *chip)
	296	{
	297	struct lp55xx_platform_data *pdata = chip->pdata;
	298
22ebeb48 MWK	299	if (pdata->enable)
22ebeb48 MWK	300	pdata->enable(0);
6ce61762	301
22ebeb48 MWK	302	if (pdata->release_resources)
22ebeb48 MWK	303	pdata->release_resources();
a85908dd	304	}
6ce61762	305	EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
a85908dd	306
9e9b3db1 MWK	307	int lp55xx_register_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	308	{
	309	struct lp55xx_platform_data *pdata = chip->pdata;
	310	struct lp55xx_device_config *cfg = chip->cfg;
	311	int num_channels = pdata->num_channels;
	312	struct lp55xx_led *each;
	313	u8 led_current;
	314	int ret;
	315	int i;
	316
	317	if (!cfg->brightness_work_fn) {
	318	dev_err(&chip->cl->dev, "empty brightness configuration\n");
	319	return -EINVAL;
	320	}
	321
	322	for (i = 0; i < num_channels; i++) {
	323
	324	/* do not initialize channels that are not connected */
	325	if (pdata->led_config[i].led_current == 0)
	326	continue;
	327
	328	led_current = pdata->led_config[i].led_current;
	329	each = led + i;
	330	ret = lp55xx_init_led(each, chip, i);
	331	if (ret)
	332	goto err_init_led;
	333
	334	INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);
	335
	336	chip->num_leds++;
	337	each->chip = chip;
	338
	339	/* setting led current at each channel */
	340	if (cfg->set_led_current)
	341	cfg->set_led_current(each, led_current);
	342	}
	343
	344	return 0;
	345
	346	err_init_led:
	347	for (i = 0; i < chip->num_leds; i++) {
	348	each = led + i;
	349	led_classdev_unregister(&each->cdev);
	350	flush_work(&each->brightness_work);
	351	}
	352	return ret;
	353	}
	354	EXPORT_SYMBOL_GPL(lp55xx_register_leds);
	355
c93d08fa MWK	356	MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
	357	MODULE_DESCRIPTION("LP55xx Common Driver");
	358	MODULE_LICENSE("GPL");