[deliverable/linux.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 <linux/slab.h>
#include <linux/gpio.h>
#include <linux/of_gpio.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;
	led->cdev.default_trigger = pdata->led_config[chan].default_trigger;

	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;
	enum lp55xx_engine_index idx = chip->engine_idx;

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

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

	chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD;
	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 (gpio_is_valid(pdata->enable_gpio)) {
		ret = devm_gpio_request_one(dev, pdata->enable_gpio,
					    GPIOF_DIR_OUT, "lp5523_enable");
		if (ret < 0) {
			dev_err(dev, "could not acquire enable gpio (err=%d)\n",
				ret);
			goto err;
		}

		gpio_set_value(pdata->enable_gpio, 0);
		usleep_range(1000, 2000); /* Keep enable down at least 1ms */
		gpio_set_value(pdata->enable_gpio, 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 (gpio_is_valid(pdata->enable_gpio))
		gpio_set_value(pdata->enable_gpio, 0);
}
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);

int lp55xx_of_populate_pdata(struct device *dev, struct device_node *np)
{
	struct device_node *child;
	struct lp55xx_platform_data *pdata;
	struct lp55xx_led_config *cfg;
	int num_channels;
	int i = 0;

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

	num_channels = of_get_child_count(np);
	if (num_channels == 0) {
		dev_err(dev, "no LED channels\n");
		return -EINVAL;
	}

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

	pdata->led_config = &cfg[0];
	pdata->num_channels = num_channels;

	for_each_child_of_node(np, child) {
		cfg[i].chan_nr = i;

		of_property_read_string(child, "chan-name", &cfg[i].name);
		of_property_read_u8(child, "led-cur", &cfg[i].led_current);
		of_property_read_u8(child, "max-cur", &cfg[i].max_current);
		cfg[i].default_trigger =
			of_get_property(child, "linux,default-trigger", NULL);

		i++;
	}

	of_property_read_string(np, "label", &pdata->label);
	of_property_read_u8(np, "clock-mode", &pdata->clock_mode);

	pdata->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);

	/* LP8501 specific */
	of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel);

	dev->platform_data = pdata;

	return 0;
}
EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata);

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>
7542a04b	22	#include <linux/slab.h>
30dae2f9 SR	23	#include <linux/gpio.h>
30dae2f9 SR	24	#include <linux/of_gpio.h>
c93d08fa MWK	25
	26	#include "leds-lp55xx-common.h"
	27
53b41922 KM	28	/* External clock rate */
	29	#define LP55XX_CLK_32K 32768
	30
a6e4679a MWK	31	static struct lp55xx_led cdev_to_lp55xx_led(struct led_classdev cdev)
	32	{
	33	return container_of(cdev, struct lp55xx_led, cdev);
	34	}
	35
a96bfa13 MWK	36	static struct lp55xx_led dev_to_lp55xx_led(struct device dev)
	37	{
	38	return cdev_to_lp55xx_led(dev_get_drvdata(dev));
	39	}
	40
48068d5d MWK	41	static void lp55xx_reset_device(struct lp55xx_chip *chip)
	42	{
	43	struct lp55xx_device_config *cfg = chip->cfg;
	44	u8 addr = cfg->reset.addr;
	45	u8 val = cfg->reset.val;
	46
	47	/* no error checking here because no ACK from the device after reset */
	48	lp55xx_write(chip, addr, val);
	49	}
	50
e3a700d8 MWK	51	static int lp55xx_detect_device(struct lp55xx_chip *chip)
	52	{
	53	struct lp55xx_device_config *cfg = chip->cfg;
	54	u8 addr = cfg->enable.addr;
	55	u8 val = cfg->enable.val;
	56	int ret;
	57
	58	ret = lp55xx_write(chip, addr, val);
	59	if (ret)
	60	return ret;
	61
	62	usleep_range(1000, 2000);
	63
	64	ret = lp55xx_read(chip, addr, &val);
	65	if (ret)
	66	return ret;
	67
	68	if (val != cfg->enable.val)
	69	return -ENODEV;
	70
	71	return 0;
	72	}
	73
ffbdccdb MWK	74	static int lp55xx_post_init_device(struct lp55xx_chip *chip)
	75	{
	76	struct lp55xx_device_config *cfg = chip->cfg;
	77
	78	if (!cfg->post_init_device)
	79	return 0;
	80
	81	return cfg->post_init_device(chip);
	82	}
	83
a96bfa13 MWK	84	static ssize_t lp55xx_show_current(struct device *dev,
	85	struct device_attribute *attr,
	86	char *buf)
	87	{
	88	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	89
24d32128	90	return scnprintf(buf, PAGE_SIZE, "%d\n", led->led_current);
a96bfa13 MWK	91	}
	92
	93	static ssize_t lp55xx_store_current(struct device *dev,
	94	struct device_attribute *attr,
	95	const char *buf, size_t len)
	96	{
	97	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	98	struct lp55xx_chip *chip = led->chip;
	99	unsigned long curr;
	100
	101	if (kstrtoul(buf, 0, &curr))
	102	return -EINVAL;
	103
	104	if (curr > led->max_current)
	105	return -EINVAL;
	106
	107	if (!chip->cfg->set_led_current)
	108	return len;
	109
	110	mutex_lock(&chip->lock);
	111	chip->cfg->set_led_current(led, (u8)curr);
	112	mutex_unlock(&chip->lock);
	113
	114	return len;
	115	}
	116
	117	static ssize_t lp55xx_show_max_current(struct device *dev,
	118	struct device_attribute *attr,
	119	char *buf)
	120	{
	121	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	122
24d32128	123	return scnprintf(buf, PAGE_SIZE, "%d\n", led->max_current);
a96bfa13 MWK	124	}
	125
	126	static DEVICE_ATTR(led_current, S_IRUGO \| S_IWUSR, lp55xx_show_current,
	127	lp55xx_store_current);
	128	static DEVICE_ATTR(max_current, S_IRUGO , lp55xx_show_max_current, NULL);
	129
0e202346	130	static struct attribute *lp55xx_led_attributes[] = {
a96bfa13 MWK	131	&dev_attr_led_current.attr,
a96bfa13 MWK	132	&dev_attr_max_current.attr,
0e202346 MWK	133	NULL,
	134	};
	135
	136	static struct attribute_group lp55xx_led_attr_group = {
	137	.attrs = lp55xx_led_attributes
	138	};
	139
	140	static void lp55xx_set_brightness(struct led_classdev *cdev,
	141	enum led_brightness brightness)
	142	{
a6e4679a MWK	143	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
	144
	145	led->brightness = (u8)brightness;
	146	schedule_work(&led->brightness_work);
0e202346 MWK	147	}
0e202346 MWK	148
9e9b3db1 MWK	149	static int lp55xx_init_led(struct lp55xx_led *led,
	150	struct lp55xx_chip *chip, int chan)
	151	{
0e202346 MWK	152	struct lp55xx_platform_data *pdata = chip->pdata;
	153	struct lp55xx_device_config *cfg = chip->cfg;
	154	struct device *dev = &chip->cl->dev;
	155	char name[32];
	156	int ret;
	157	int max_channel = cfg->max_channel;
	158
	159	if (chan >= max_channel) {
	160	dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
	161	return -EINVAL;
	162	}
	163
	164	if (pdata->led_config[chan].led_current == 0)
	165	return 0;
	166
	167	led->led_current = pdata->led_config[chan].led_current;
	168	led->max_current = pdata->led_config[chan].max_current;
	169	led->chan_nr = pdata->led_config[chan].chan_nr;
f65f0a1a	170	led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
0e202346 MWK	171
	172	if (led->chan_nr >= max_channel) {
	173	dev_err(dev, "Use channel numbers between 0 and %d\n",
	174	max_channel - 1);
	175	return -EINVAL;
	176	}
	177
	178	led->cdev.brightness_set = lp55xx_set_brightness;
	179
	180	if (pdata->led_config[chan].name) {
	181	led->cdev.name = pdata->led_config[chan].name;
	182	} else {
	183	snprintf(name, sizeof(name), "%s:channel%d",
	184	pdata->label ? : chip->cl->name, chan);
	185	led->cdev.name = name;
	186	}
	187
	188	/*
	189	* register led class device for each channel and
	190	* add device attributes
	191	*/
	192
	193	ret = led_classdev_register(dev, &led->cdev);
	194	if (ret) {
	195	dev_err(dev, "led register err: %d\n", ret);
	196	return ret;
	197	}
	198
	199	ret = sysfs_create_group(&led->cdev.dev->kobj, &lp55xx_led_attr_group);
	200	if (ret) {
	201	dev_err(dev, "led sysfs err: %d\n", ret);
	202	led_classdev_unregister(&led->cdev);
	203	return ret;
	204	}
	205
9e9b3db1 MWK	206	return 0;
	207	}
	208
10c06d17 MWK	209	static void lp55xx_firmware_loaded(const struct firmware fw, void context)
	210	{
	211	struct lp55xx_chip *chip = context;
	212	struct device *dev = &chip->cl->dev;
93ad8a1d	213	enum lp55xx_engine_index idx = chip->engine_idx;
10c06d17 MWK	214
	215	if (!fw) {
	216	dev_err(dev, "firmware request failed\n");
	217	goto out;
	218	}
	219
	220	/* handling firmware data is chip dependent */
	221	mutex_lock(&chip->lock);
	222
93ad8a1d	223	chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD;
10c06d17 MWK	224	chip->fw = fw;
	225	if (chip->cfg->firmware_cb)
	226	chip->cfg->firmware_cb(chip);
	227
	228	mutex_unlock(&chip->lock);
	229
	230	out:
	231	/* firmware should be released for other channel use */
	232	release_firmware(chip->fw);
	233	}
	234
	235	static int lp55xx_request_firmware(struct lp55xx_chip *chip)
	236	{
	237	const char *name = chip->cl->name;
	238	struct device *dev = &chip->cl->dev;
	239
	240	return request_firmware_nowait(THIS_MODULE, true, name, dev,
	241	GFP_KERNEL, chip, lp55xx_firmware_loaded);
	242	}
	243
	244	static ssize_t lp55xx_show_engine_select(struct device *dev,
	245	struct device_attribute *attr,
	246	char *buf)
	247	{
	248	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	249	struct lp55xx_chip *chip = led->chip;
	250
	251	return sprintf(buf, "%d\n", chip->engine_idx);
	252	}
	253
	254	static ssize_t lp55xx_store_engine_select(struct device *dev,
	255	struct device_attribute *attr,
	256	const char *buf, size_t len)
	257	{
	258	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	259	struct lp55xx_chip *chip = led->chip;
	260	unsigned long val;
	261	int ret;
	262
	263	if (kstrtoul(buf, 0, &val))
	264	return -EINVAL;
	265
	266	/* select the engine to be run */
	267
	268	switch (val) {
	269	case LP55XX_ENGINE_1:
	270	case LP55XX_ENGINE_2:
	271	case LP55XX_ENGINE_3:
	272	mutex_lock(&chip->lock);
	273	chip->engine_idx = val;
	274	ret = lp55xx_request_firmware(chip);
	275	mutex_unlock(&chip->lock);
	276	break;
	277	default:
	278	dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val);
	279	return -EINVAL;
	280	}
	281
	282	if (ret) {
	283	dev_err(dev, "request firmware err: %d\n", ret);
	284	return ret;
	285	}
	286
	287	return len;
288	}
289
290	static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start)
291	{
292	if (chip->cfg->run_engine)
293	chip->cfg->run_engine(chip, start);
294	}
295
296	static ssize_t lp55xx_store_engine_run(struct device *dev,
297	struct device_attribute *attr,
298	const char *buf, size_t len)
299	{
300	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
301	struct lp55xx_chip *chip = led->chip;
302	unsigned long val;
303
304	if (kstrtoul(buf, 0, &val))
305	return -EINVAL;
306
307	/* run or stop the selected engine */
308
309	if (val <= 0) {
310	lp55xx_run_engine(chip, false);
311	return len;
312	}
313
314	mutex_lock(&chip->lock);
315	lp55xx_run_engine(chip, true);
316	mutex_unlock(&chip->lock);
317
318	return len;
319	}
320
321	static DEVICE_ATTR(select_engine, S_IRUGO \| S_IWUSR,
322	lp55xx_show_engine_select, lp55xx_store_engine_select);
323	static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run);
324
b3b6f811	325	static struct attribute *lp55xx_engine_attributes[] = {
10c06d17 MWK	326	&dev_attr_select_engine.attr,
10c06d17 MWK	327	&dev_attr_run_engine.attr,
b3b6f811 MWK	328	NULL,
	329	};
	330
	331	static const struct attribute_group lp55xx_engine_attr_group = {
	332	.attrs = lp55xx_engine_attributes,
	333	};
	334
c93d08fa MWK	335	int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
	336	{
	337	return i2c_smbus_write_byte_data(chip->cl, reg, val);
	338	}
	339	EXPORT_SYMBOL_GPL(lp55xx_write);
	340
	341	int lp55xx_read(struct lp55xx_chip chip, u8 reg, u8 val)
	342	{
	343	s32 ret;
	344
	345	ret = i2c_smbus_read_byte_data(chip->cl, reg);
	346	if (ret < 0)
	347	return ret;
	348
	349	*val = ret;
	350	return 0;
	351	}
	352	EXPORT_SYMBOL_GPL(lp55xx_read);
	353
	354	int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
	355	{
	356	int ret;
	357	u8 tmp;
	358
	359	ret = lp55xx_read(chip, reg, &tmp);
	360	if (ret)
	361	return ret;
	362
	363	tmp &= ~mask;
	364	tmp \|= val & mask;
	365
	366	return lp55xx_write(chip, reg, tmp);
	367	}
	368	EXPORT_SYMBOL_GPL(lp55xx_update_bits);
	369
53b41922 KM	370	bool lp55xx_is_extclk_used(struct lp55xx_chip *chip)
	371	{
	372	struct clk *clk;
	373	int err;
	374
	375	clk = devm_clk_get(&chip->cl->dev, "32k_clk");
	376	if (IS_ERR(clk))
	377	goto use_internal_clk;
	378
	379	err = clk_prepare_enable(clk);
	380	if (err)
	381	goto use_internal_clk;
	382
	383	if (clk_get_rate(clk) != LP55XX_CLK_32K) {
	384	clk_disable_unprepare(clk);
	385	goto use_internal_clk;
	386	}
	387
	388	dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K);
	389
	390	chip->clk = clk;
	391	return true;
	392
	393	use_internal_clk:
	394	dev_info(&chip->cl->dev, "internal clock used\n");
	395	return false;
	396	}
	397	EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used);
	398
a85908dd MWK	399	int lp55xx_init_device(struct lp55xx_chip *chip)
	400	{
	401	struct lp55xx_platform_data *pdata;
48068d5d	402	struct lp55xx_device_config *cfg;
a85908dd MWK	403	struct device *dev = &chip->cl->dev;
	404	int ret = 0;
	405
	406	WARN_ON(!chip);
	407
	408	pdata = chip->pdata;
48068d5d	409	cfg = chip->cfg;
a85908dd	410
48068d5d	411	if (!pdata \|\| !cfg)
a85908dd MWK	412	return -EINVAL;
a85908dd MWK	413
30dae2f9 SR	414	if (gpio_is_valid(pdata->enable_gpio)) {
	415	ret = devm_gpio_request_one(dev, pdata->enable_gpio,
	416	GPIOF_DIR_OUT, "lp5523_enable");
a85908dd	417	if (ret < 0) {
30dae2f9 SR	418	dev_err(dev, "could not acquire enable gpio (err=%d)\n",
30dae2f9 SR	419	ret);
a85908dd MWK	420	goto err;
a85908dd MWK	421	}
a85908dd	422
30dae2f9	423	gpio_set_value(pdata->enable_gpio, 0);
a85908dd	424	usleep_range(1000, 2000); /* Keep enable down at least 1ms */
30dae2f9	425	gpio_set_value(pdata->enable_gpio, 1);
a85908dd MWK	426	usleep_range(1000, 2000); /* 500us abs min. */
	427	}
	428
48068d5d MWK	429	lp55xx_reset_device(chip);
	430
	431	/*
	432	* Exact value is not available. 10 - 20ms
	433	* appears to be enough for reset.
	434	*/
	435	usleep_range(10000, 20000);
	436
e3a700d8 MWK	437	ret = lp55xx_detect_device(chip);
	438	if (ret) {
	439	dev_err(dev, "device detection err: %d\n", ret);
	440	goto err;
	441	}
	442
ffbdccdb MWK	443	/* chip specific initialization */
ffbdccdb MWK	444	ret = lp55xx_post_init_device(chip);
22ebeb48 MWK	445	if (ret) {
	446	dev_err(dev, "post init device err: %d\n", ret);
	447	goto err_post_init;
	448	}
ffbdccdb MWK	449
	450	return 0;
	451
22ebeb48	452	err_post_init:
6ce61762 MWK	453	lp55xx_deinit_device(chip);
	454	err:
	455	return ret;
	456	}
	457	EXPORT_SYMBOL_GPL(lp55xx_init_device);
	458
	459	void lp55xx_deinit_device(struct lp55xx_chip *chip)
	460	{
	461	struct lp55xx_platform_data *pdata = chip->pdata;
	462
53b41922 KM	463	if (chip->clk)
	464	clk_disable_unprepare(chip->clk);
	465
30dae2f9 SR	466	if (gpio_is_valid(pdata->enable_gpio))
30dae2f9 SR	467	gpio_set_value(pdata->enable_gpio, 0);
a85908dd	468	}
6ce61762	469	EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
a85908dd	470
9e9b3db1 MWK	471	int lp55xx_register_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	472	{
	473	struct lp55xx_platform_data *pdata = chip->pdata;
	474	struct lp55xx_device_config *cfg = chip->cfg;
	475	int num_channels = pdata->num_channels;
	476	struct lp55xx_led *each;
	477	u8 led_current;
	478	int ret;
	479	int i;
	480
	481	if (!cfg->brightness_work_fn) {
	482	dev_err(&chip->cl->dev, "empty brightness configuration\n");
	483	return -EINVAL;
	484	}
	485
	486	for (i = 0; i < num_channels; i++) {
	487
	488	/* do not initialize channels that are not connected */
	489	if (pdata->led_config[i].led_current == 0)
	490	continue;
	491
	492	led_current = pdata->led_config[i].led_current;
	493	each = led + i;
	494	ret = lp55xx_init_led(each, chip, i);
	495	if (ret)
	496	goto err_init_led;
	497
	498	INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);
	499
	500	chip->num_leds++;
	501	each->chip = chip;
	502
	503	/* setting led current at each channel */
	504	if (cfg->set_led_current)
	505	cfg->set_led_current(each, led_current);
	506	}
	507
	508	return 0;
	509
	510	err_init_led:
d9067d28	511	lp55xx_unregister_leds(led, chip);
9e9b3db1 MWK	512	return ret;
	513	}
	514	EXPORT_SYMBOL_GPL(lp55xx_register_leds);
	515
c3a68ebf MWK	516	void lp55xx_unregister_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	517	{
	518	int i;
	519	struct lp55xx_led *each;
c3a68ebf MWK	520
	521	for (i = 0; i < chip->num_leds; i++) {
	522	each = led + i;
c3a68ebf MWK	523	led_classdev_unregister(&each->cdev);
	524	flush_work(&each->brightness_work);
	525	}
	526	}
	527	EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);
	528
b3b6f811 MWK	529	int lp55xx_register_sysfs(struct lp55xx_chip *chip)
	530	{
	531	struct device *dev = &chip->cl->dev;
240085e2 MWK	532	struct lp55xx_device_config *cfg = chip->cfg;
	533	int ret;
	534
	535	if (!cfg->run_engine \|\| !cfg->firmware_cb)
	536	goto dev_specific_attrs;
	537
	538	ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
	539	if (ret)
	540	return ret;
b3b6f811	541
240085e2 MWK	542	dev_specific_attrs:
	543	return cfg->dev_attr_group ?
	544	sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
b3b6f811 MWK	545	}
	546	EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
	547
ba6fa846 MWK	548	void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
	549	{
	550	struct device *dev = &chip->cl->dev;
	551	struct lp55xx_device_config *cfg = chip->cfg;
	552
	553	if (cfg->dev_attr_group)
	554	sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);
	555
	556	sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
	557	}
	558	EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
	559
7542a04b LW	560	int lp55xx_of_populate_pdata(struct device dev, struct device_node np)
7542a04b LW	561	{
2dac9128	562	struct device_node *child;
7542a04b	563	struct lp55xx_platform_data *pdata;
2dac9128 KM	564	struct lp55xx_led_config *cfg;
	565	int num_channels;
	566	int i = 0;
7542a04b LW	567
	568	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	569	if (!pdata)
	570	return -ENOMEM;
	571
2dac9128 KM	572	num_channels = of_get_child_count(np);
	573	if (num_channels == 0) {
	574	dev_err(dev, "no LED channels\n");
	575	return -EINVAL;
	576	}
7542a04b	577
2dac9128 KM	578	cfg = devm_kzalloc(dev, sizeof(cfg) num_channels, GFP_KERNEL);
2dac9128 KM	579	if (!cfg)
7542a04b LW	580	return -ENOMEM;
7542a04b LW	581
2dac9128 KM	582	pdata->led_config = &cfg[0];
	583	pdata->num_channels = num_channels;
	584
	585	for_each_child_of_node(np, child) {
	586	cfg[i].chan_nr = i;
	587
	588	of_property_read_string(child, "chan-name", &cfg[i].name);
	589	of_property_read_u8(child, "led-cur", &cfg[i].led_current);
	590	of_property_read_u8(child, "max-cur", &cfg[i].max_current);
f65f0a1a LW	591	cfg[i].default_trigger =
f65f0a1a LW	592	of_get_property(child, "linux,default-trigger", NULL);
2dac9128 KM	593
2dac9128 KM	594	i++;
7542a04b	595	}
2dac9128 KM	596
	597	of_property_read_string(np, "label", &pdata->label);
	598	of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
	599
30dae2f9 SR	600	pdata->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
30dae2f9 SR	601
33b3a561 KM	602	/* LP8501 specific */
	603	of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel);
	604
7542a04b LW	605	dev->platform_data = pdata;
	606
	607	return 0;
	608	}
	609	EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata);
	610
c93d08fa MWK	611	MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
	612	MODULE_DESCRIPTION("LP55xx Common Driver");
	613	MODULE_LICENSE("GPL");