[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / leds / leds-lp55xx-common.c

/*
 * LP5521/LP5523/LP55231/LP5562 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/clk.h>
#include <linux/delay.h>
#include <linux/firmware.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"

/* External clock rate */
#define LP55XX_CLK_32K			32768

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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%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;
}

static void lp55xx_firmware_loaded(const struct firmware *fw, void *context)
{
	struct lp55xx_chip *chip = context;
	struct device *dev = &chip->cl->dev;

	if (!fw) {
		dev_err(dev, "firmware request failed\n");
		goto out;
	}

	/* handling firmware data is chip dependent */
	mutex_lock(&chip->lock);

	chip->fw = fw;
	if (chip->cfg->firmware_cb)
		chip->cfg->firmware_cb(chip);

	mutex_unlock(&chip->lock);

out:
	/* firmware should be released for other channel use */
	release_firmware(chip->fw);
}

static int lp55xx_request_firmware(struct lp55xx_chip *chip)
{
	const char *name = chip->cl->name;
	struct device *dev = &chip->cl->dev;

	return request_firmware_nowait(THIS_MODULE, true, name, dev,
				GFP_KERNEL, chip, lp55xx_firmware_loaded);
}

static ssize_t lp55xx_show_engine_select(struct device *dev,
			    struct device_attribute *attr,
			    char *buf)
{
	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	struct lp55xx_chip *chip = led->chip;

	return sprintf(buf, "%d\n", chip->engine_idx);
}

static ssize_t lp55xx_store_engine_select(struct device *dev,
			     struct device_attribute *attr,
			     const char *buf, size_t len)
{
	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	struct lp55xx_chip *chip = led->chip;
	unsigned long val;
	int ret;

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

	/* select the engine to be run */

	switch (val) {
	case LP55XX_ENGINE_1:
	case LP55XX_ENGINE_2:
	case LP55XX_ENGINE_3:
		mutex_lock(&chip->lock);
		chip->engine_idx = val;
		ret = lp55xx_request_firmware(chip);
		mutex_unlock(&chip->lock);
		break;
	default:
		dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val);
		return -EINVAL;
	}

	if (ret) {
		dev_err(dev, "request firmware err: %d\n", ret);
		return ret;
	}

	return len;
}

static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start)
{
	if (chip->cfg->run_engine)
		chip->cfg->run_engine(chip, start);
}

static ssize_t lp55xx_store_engine_run(struct device *dev,
			     struct device_attribute *attr,
			     const char *buf, size_t len)
{
	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	struct lp55xx_chip *chip = led->chip;
	unsigned long val;

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

	/* run or stop the selected engine */

	if (val <= 0) {
		lp55xx_run_engine(chip, false);
		return len;
	}

	mutex_lock(&chip->lock);
	lp55xx_run_engine(chip, true);
	mutex_unlock(&chip->lock);

	return len;
}

static DEVICE_ATTR(select_engine, S_IRUGO | S_IWUSR,
		   lp55xx_show_engine_select, lp55xx_store_engine_select);
static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run);

static struct attribute *lp55xx_engine_attributes[] = {
	&dev_attr_select_engine.attr,
	&dev_attr_run_engine.attr,
	NULL,
};

static const struct attribute_group lp55xx_engine_attr_group = {
	.attrs = lp55xx_engine_attributes,
};

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);

bool lp55xx_is_extclk_used(struct lp55xx_chip *chip)
{
	struct clk *clk;
	int err;

	clk = devm_clk_get(&chip->cl->dev, "32k_clk");
	if (IS_ERR(clk))
		goto use_internal_clk;

	err = clk_prepare_enable(clk);
	if (err)
		goto use_internal_clk;

	if (clk_get_rate(clk) != LP55XX_CLK_32K) {
		clk_disable_unprepare(clk);
		goto use_internal_clk;
	}

	dev_info(&chip->cl->dev, "%dHz external clock used\n",	LP55XX_CLK_32K);

	chip->clk = clk;
	return true;

use_internal_clk:
	dev_info(&chip->cl->dev, "internal clock used\n");
	return false;
}
EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used);

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 (chip->clk)
		clk_disable_unprepare(chip->clk);

	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:
	lp55xx_unregister_leds(led, chip);
	return ret;
}
EXPORT_SYMBOL_GPL(lp55xx_register_leds);

void lp55xx_unregister_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
{
	int i;
	struct lp55xx_led *each;

	for (i = 0; i < chip->num_leds; i++) {
		each = led + i;
		led_classdev_unregister(&each->cdev);
		flush_work(&each->brightness_work);
	}
}
EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);

int lp55xx_register_sysfs(struct lp55xx_chip *chip)
{
	struct device *dev = &chip->cl->dev;
	struct lp55xx_device_config *cfg = chip->cfg;
	int ret;

	if (!cfg->run_engine || !cfg->firmware_cb)
		goto dev_specific_attrs;

	ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
	if (ret)
		return ret;

dev_specific_attrs:
	return cfg->dev_attr_group ?
		sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
}
EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);

void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
{
	struct device *dev = &chip->cl->dev;
	struct lp55xx_device_config *cfg = chip->cfg;

	if (cfg->dev_attr_group)
		sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);

	sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
}
EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);

MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
MODULE_DESCRIPTION("LP55xx Common Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
c93d08fa	1	/*
ff45262a	2	* LP5521/LP5523/LP55231/LP5562 Common Driver
c93d08fa MWK	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
53b41922	15	#include <linux/clk.h>
a85908dd	16	#include <linux/delay.h>
10c06d17	17	#include <linux/firmware.h>
c93d08fa MWK	18	#include <linux/i2c.h>
	19	#include <linux/leds.h>
	20	#include <linux/module.h>
	21	#include <linux/platform_data/leds-lp55xx.h>
	22
	23	#include "leds-lp55xx-common.h"
	24
53b41922 KM	25	/* External clock rate */
	26	#define LP55XX_CLK_32K 32768
	27
a6e4679a MWK	28	static struct lp55xx_led cdev_to_lp55xx_led(struct led_classdev cdev)
	29	{
	30	return container_of(cdev, struct lp55xx_led, cdev);
	31	}
	32
a96bfa13 MWK	33	static struct lp55xx_led dev_to_lp55xx_led(struct device dev)
	34	{
	35	return cdev_to_lp55xx_led(dev_get_drvdata(dev));
	36	}
	37
48068d5d MWK	38	static void lp55xx_reset_device(struct lp55xx_chip *chip)
	39	{
	40	struct lp55xx_device_config *cfg = chip->cfg;
	41	u8 addr = cfg->reset.addr;
	42	u8 val = cfg->reset.val;
	43
	44	/* no error checking here because no ACK from the device after reset */
	45	lp55xx_write(chip, addr, val);
	46	}
	47
e3a700d8 MWK	48	static int lp55xx_detect_device(struct lp55xx_chip *chip)
	49	{
	50	struct lp55xx_device_config *cfg = chip->cfg;
	51	u8 addr = cfg->enable.addr;
	52	u8 val = cfg->enable.val;
	53	int ret;
	54
	55	ret = lp55xx_write(chip, addr, val);
	56	if (ret)
	57	return ret;
	58
	59	usleep_range(1000, 2000);
	60
	61	ret = lp55xx_read(chip, addr, &val);
	62	if (ret)
	63	return ret;
	64
	65	if (val != cfg->enable.val)
	66	return -ENODEV;
	67
	68	return 0;
	69	}
	70
ffbdccdb MWK	71	static int lp55xx_post_init_device(struct lp55xx_chip *chip)
	72	{
	73	struct lp55xx_device_config *cfg = chip->cfg;
	74
	75	if (!cfg->post_init_device)
	76	return 0;
	77
	78	return cfg->post_init_device(chip);
	79	}
	80
a96bfa13 MWK	81	static ssize_t lp55xx_show_current(struct device *dev,
	82	struct device_attribute *attr,
	83	char *buf)
	84	{
	85	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	86
24d32128	87	return scnprintf(buf, PAGE_SIZE, "%d\n", led->led_current);
a96bfa13 MWK	88	}
	89
	90	static ssize_t lp55xx_store_current(struct device *dev,
	91	struct device_attribute *attr,
	92	const char *buf, size_t len)
	93	{
	94	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	95	struct lp55xx_chip *chip = led->chip;
	96	unsigned long curr;
	97
	98	if (kstrtoul(buf, 0, &curr))
	99	return -EINVAL;
	100
	101	if (curr > led->max_current)
	102	return -EINVAL;
	103
	104	if (!chip->cfg->set_led_current)
	105	return len;
	106
	107	mutex_lock(&chip->lock);
	108	chip->cfg->set_led_current(led, (u8)curr);
	109	mutex_unlock(&chip->lock);
	110
	111	return len;
	112	}
	113
	114	static ssize_t lp55xx_show_max_current(struct device *dev,
	115	struct device_attribute *attr,
	116	char *buf)
	117	{
	118	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	119
24d32128	120	return scnprintf(buf, PAGE_SIZE, "%d\n", led->max_current);
a96bfa13 MWK	121	}
	122
	123	static DEVICE_ATTR(led_current, S_IRUGO \| S_IWUSR, lp55xx_show_current,
	124	lp55xx_store_current);
	125	static DEVICE_ATTR(max_current, S_IRUGO , lp55xx_show_max_current, NULL);
	126
0e202346	127	static struct attribute *lp55xx_led_attributes[] = {
a96bfa13 MWK	128	&dev_attr_led_current.attr,
a96bfa13 MWK	129	&dev_attr_max_current.attr,
0e202346 MWK	130	NULL,
	131	};
	132
	133	static struct attribute_group lp55xx_led_attr_group = {
	134	.attrs = lp55xx_led_attributes
	135	};
	136
	137	static void lp55xx_set_brightness(struct led_classdev *cdev,
	138	enum led_brightness brightness)
	139	{
a6e4679a MWK	140	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
	141
	142	led->brightness = (u8)brightness;
	143	schedule_work(&led->brightness_work);
0e202346 MWK	144	}
0e202346 MWK	145
9e9b3db1 MWK	146	static int lp55xx_init_led(struct lp55xx_led *led,
	147	struct lp55xx_chip *chip, int chan)
	148	{
0e202346 MWK	149	struct lp55xx_platform_data *pdata = chip->pdata;
	150	struct lp55xx_device_config *cfg = chip->cfg;
	151	struct device *dev = &chip->cl->dev;
	152	char name[32];
	153	int ret;
	154	int max_channel = cfg->max_channel;
	155
	156	if (chan >= max_channel) {
	157	dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
	158	return -EINVAL;
	159	}
	160
	161	if (pdata->led_config[chan].led_current == 0)
	162	return 0;
	163
	164	led->led_current = pdata->led_config[chan].led_current;
	165	led->max_current = pdata->led_config[chan].max_current;
	166	led->chan_nr = pdata->led_config[chan].chan_nr;
	167
	168	if (led->chan_nr >= max_channel) {
	169	dev_err(dev, "Use channel numbers between 0 and %d\n",
	170	max_channel - 1);
	171	return -EINVAL;
	172	}
	173
	174	led->cdev.brightness_set = lp55xx_set_brightness;
	175
	176	if (pdata->led_config[chan].name) {
	177	led->cdev.name = pdata->led_config[chan].name;
	178	} else {
	179	snprintf(name, sizeof(name), "%s:channel%d",
	180	pdata->label ? : chip->cl->name, chan);
	181	led->cdev.name = name;
	182	}
	183
	184	/*
	185	* register led class device for each channel and
	186	* add device attributes
	187	*/
	188
	189	ret = led_classdev_register(dev, &led->cdev);
	190	if (ret) {
	191	dev_err(dev, "led register err: %d\n", ret);
	192	return ret;
	193	}
	194
	195	ret = sysfs_create_group(&led->cdev.dev->kobj, &lp55xx_led_attr_group);
	196	if (ret) {
	197	dev_err(dev, "led sysfs err: %d\n", ret);
	198	led_classdev_unregister(&led->cdev);
	199	return ret;
	200	}
	201
9e9b3db1 MWK	202	return 0;
	203	}
	204
10c06d17 MWK	205	static void lp55xx_firmware_loaded(const struct firmware fw, void context)
	206	{
	207	struct lp55xx_chip *chip = context;
	208	struct device *dev = &chip->cl->dev;
	209
	210	if (!fw) {
	211	dev_err(dev, "firmware request failed\n");
	212	goto out;
	213	}
	214
	215	/* handling firmware data is chip dependent */
	216	mutex_lock(&chip->lock);
	217
	218	chip->fw = fw;
	219	if (chip->cfg->firmware_cb)
	220	chip->cfg->firmware_cb(chip);
	221
	222	mutex_unlock(&chip->lock);
	223
	224	out:
	225	/* firmware should be released for other channel use */
	226	release_firmware(chip->fw);
	227	}
	228
	229	static int lp55xx_request_firmware(struct lp55xx_chip *chip)
	230	{
	231	const char *name = chip->cl->name;
	232	struct device *dev = &chip->cl->dev;
	233
	234	return request_firmware_nowait(THIS_MODULE, true, name, dev,
	235	GFP_KERNEL, chip, lp55xx_firmware_loaded);
	236	}
	237
	238	static ssize_t lp55xx_show_engine_select(struct device *dev,
	239	struct device_attribute *attr,
	240	char *buf)
	241	{
	242	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	243	struct lp55xx_chip *chip = led->chip;
	244
	245	return sprintf(buf, "%d\n", chip->engine_idx);
	246	}
	247
	248	static ssize_t lp55xx_store_engine_select(struct device *dev,
	249	struct device_attribute *attr,
	250	const char *buf, size_t len)
	251	{
	252	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	253	struct lp55xx_chip *chip = led->chip;
	254	unsigned long val;
	255	int ret;
	256
	257	if (kstrtoul(buf, 0, &val))
	258	return -EINVAL;
	259
	260	/* select the engine to be run */
	261
	262	switch (val) {
	263	case LP55XX_ENGINE_1:
	264	case LP55XX_ENGINE_2:
	265	case LP55XX_ENGINE_3:
	266	mutex_lock(&chip->lock);
	267	chip->engine_idx = val;
	268	ret = lp55xx_request_firmware(chip);
269	mutex_unlock(&chip->lock);
270	break;
271	default:
272	dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val);
273	return -EINVAL;
274	}
275
276	if (ret) {
277	dev_err(dev, "request firmware err: %d\n", ret);
278	return ret;
279	}
280
281	return len;
282	}
283
284	static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start)
285	{
286	if (chip->cfg->run_engine)
287	chip->cfg->run_engine(chip, start);
288	}
289
290	static ssize_t lp55xx_store_engine_run(struct device *dev,
291	struct device_attribute *attr,
292	const char *buf, size_t len)
293	{
294	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
295	struct lp55xx_chip *chip = led->chip;
296	unsigned long val;
297
298	if (kstrtoul(buf, 0, &val))
299	return -EINVAL;
300
301	/* run or stop the selected engine */
302
303	if (val <= 0) {
304	lp55xx_run_engine(chip, false);
305	return len;
306	}
307
308	mutex_lock(&chip->lock);
309	lp55xx_run_engine(chip, true);
310	mutex_unlock(&chip->lock);
311
312	return len;
313	}
314
315	static DEVICE_ATTR(select_engine, S_IRUGO \| S_IWUSR,
316	lp55xx_show_engine_select, lp55xx_store_engine_select);
317	static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run);
318
b3b6f811	319	static struct attribute *lp55xx_engine_attributes[] = {
10c06d17 MWK	320	&dev_attr_select_engine.attr,
10c06d17 MWK	321	&dev_attr_run_engine.attr,
b3b6f811 MWK	322	NULL,
	323	};
	324
	325	static const struct attribute_group lp55xx_engine_attr_group = {
	326	.attrs = lp55xx_engine_attributes,
	327	};
	328
c93d08fa MWK	329	int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
	330	{
	331	return i2c_smbus_write_byte_data(chip->cl, reg, val);
	332	}
	333	EXPORT_SYMBOL_GPL(lp55xx_write);
	334
	335	int lp55xx_read(struct lp55xx_chip chip, u8 reg, u8 val)
	336	{
	337	s32 ret;
	338
	339	ret = i2c_smbus_read_byte_data(chip->cl, reg);
	340	if (ret < 0)
	341	return ret;
	342
	343	*val = ret;
	344	return 0;
	345	}
	346	EXPORT_SYMBOL_GPL(lp55xx_read);
	347
	348	int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
	349	{
	350	int ret;
	351	u8 tmp;
	352
	353	ret = lp55xx_read(chip, reg, &tmp);
	354	if (ret)
	355	return ret;
	356
	357	tmp &= ~mask;
	358	tmp \|= val & mask;
	359
	360	return lp55xx_write(chip, reg, tmp);
	361	}
	362	EXPORT_SYMBOL_GPL(lp55xx_update_bits);
	363
53b41922 KM	364	bool lp55xx_is_extclk_used(struct lp55xx_chip *chip)
	365	{
	366	struct clk *clk;
	367	int err;
	368
	369	clk = devm_clk_get(&chip->cl->dev, "32k_clk");
	370	if (IS_ERR(clk))
	371	goto use_internal_clk;
	372
	373	err = clk_prepare_enable(clk);
	374	if (err)
	375	goto use_internal_clk;
	376
	377	if (clk_get_rate(clk) != LP55XX_CLK_32K) {
	378	clk_disable_unprepare(clk);
	379	goto use_internal_clk;
	380	}
	381
	382	dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K);
	383
	384	chip->clk = clk;
	385	return true;
	386
	387	use_internal_clk:
	388	dev_info(&chip->cl->dev, "internal clock used\n");
	389	return false;
	390	}
	391	EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used);
	392
a85908dd MWK	393	int lp55xx_init_device(struct lp55xx_chip *chip)
	394	{
	395	struct lp55xx_platform_data *pdata;
48068d5d	396	struct lp55xx_device_config *cfg;
a85908dd MWK	397	struct device *dev = &chip->cl->dev;
	398	int ret = 0;
	399
	400	WARN_ON(!chip);
	401
	402	pdata = chip->pdata;
48068d5d	403	cfg = chip->cfg;
a85908dd	404
48068d5d	405	if (!pdata \|\| !cfg)
a85908dd MWK	406	return -EINVAL;
	407
	408	if (pdata->setup_resources) {
	409	ret = pdata->setup_resources();
	410	if (ret < 0) {
	411	dev_err(dev, "setup resoure err: %d\n", ret);
	412	goto err;
	413	}
	414	}
	415
	416	if (pdata->enable) {
	417	pdata->enable(0);
	418	usleep_range(1000, 2000); /* Keep enable down at least 1ms */
	419	pdata->enable(1);
	420	usleep_range(1000, 2000); /* 500us abs min. */
	421	}
	422
48068d5d MWK	423	lp55xx_reset_device(chip);
	424
	425	/*
	426	* Exact value is not available. 10 - 20ms
	427	* appears to be enough for reset.
	428	*/
	429	usleep_range(10000, 20000);
	430
e3a700d8 MWK	431	ret = lp55xx_detect_device(chip);
	432	if (ret) {
	433	dev_err(dev, "device detection err: %d\n", ret);
	434	goto err;
	435	}
	436
ffbdccdb MWK	437	/* chip specific initialization */
ffbdccdb MWK	438	ret = lp55xx_post_init_device(chip);
22ebeb48 MWK	439	if (ret) {
	440	dev_err(dev, "post init device err: %d\n", ret);
	441	goto err_post_init;
	442	}
ffbdccdb MWK	443
	444	return 0;
	445
22ebeb48	446	err_post_init:
6ce61762 MWK	447	lp55xx_deinit_device(chip);
	448	err:
	449	return ret;
	450	}
	451	EXPORT_SYMBOL_GPL(lp55xx_init_device);
	452
	453	void lp55xx_deinit_device(struct lp55xx_chip *chip)
	454	{
	455	struct lp55xx_platform_data *pdata = chip->pdata;
	456
53b41922 KM	457	if (chip->clk)
	458	clk_disable_unprepare(chip->clk);
	459
22ebeb48 MWK	460	if (pdata->enable)
22ebeb48 MWK	461	pdata->enable(0);
6ce61762	462
22ebeb48 MWK	463	if (pdata->release_resources)
22ebeb48 MWK	464	pdata->release_resources();
a85908dd	465	}
6ce61762	466	EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
a85908dd	467
9e9b3db1 MWK	468	int lp55xx_register_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	469	{
	470	struct lp55xx_platform_data *pdata = chip->pdata;
	471	struct lp55xx_device_config *cfg = chip->cfg;
	472	int num_channels = pdata->num_channels;
	473	struct lp55xx_led *each;
	474	u8 led_current;
	475	int ret;
	476	int i;
	477
	478	if (!cfg->brightness_work_fn) {
	479	dev_err(&chip->cl->dev, "empty brightness configuration\n");
	480	return -EINVAL;
	481	}
	482
	483	for (i = 0; i < num_channels; i++) {
	484
	485	/* do not initialize channels that are not connected */
	486	if (pdata->led_config[i].led_current == 0)
	487	continue;
	488
	489	led_current = pdata->led_config[i].led_current;
	490	each = led + i;
	491	ret = lp55xx_init_led(each, chip, i);
	492	if (ret)
	493	goto err_init_led;
	494
	495	INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);
	496
	497	chip->num_leds++;
	498	each->chip = chip;
	499
	500	/* setting led current at each channel */
	501	if (cfg->set_led_current)
	502	cfg->set_led_current(each, led_current);
	503	}
	504
	505	return 0;
	506
	507	err_init_led:
d9067d28	508	lp55xx_unregister_leds(led, chip);
9e9b3db1 MWK	509	return ret;
	510	}
	511	EXPORT_SYMBOL_GPL(lp55xx_register_leds);
	512
c3a68ebf MWK	513	void lp55xx_unregister_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	514	{
	515	int i;
	516	struct lp55xx_led *each;
c3a68ebf MWK	517
	518	for (i = 0; i < chip->num_leds; i++) {
	519	each = led + i;
c3a68ebf MWK	520	led_classdev_unregister(&each->cdev);
	521	flush_work(&each->brightness_work);
	522	}
	523	}
	524	EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);
	525
b3b6f811 MWK	526	int lp55xx_register_sysfs(struct lp55xx_chip *chip)
	527	{
	528	struct device *dev = &chip->cl->dev;
240085e2 MWK	529	struct lp55xx_device_config *cfg = chip->cfg;
	530	int ret;
	531
	532	if (!cfg->run_engine \|\| !cfg->firmware_cb)
	533	goto dev_specific_attrs;
	534
	535	ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
	536	if (ret)
	537	return ret;
b3b6f811	538
240085e2 MWK	539	dev_specific_attrs:
	540	return cfg->dev_attr_group ?
	541	sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
b3b6f811 MWK	542	}
	543	EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
	544
ba6fa846 MWK	545	void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
	546	{
	547	struct device *dev = &chip->cl->dev;
	548	struct lp55xx_device_config *cfg = chip->cfg;
	549
	550	if (cfg->dev_attr_group)
	551	sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);
	552
	553	sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
	554	}
	555	EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
	556
c93d08fa MWK	557	MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
	558	MODULE_DESCRIPTION("LP55xx Common Driver");
	559	MODULE_LICENSE("GPL");