[mirror_ubuntu-bionic-kernel.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_attrs[] = {
	&dev_attr_led_current.attr,
	&dev_attr_max_current.attr,
	NULL,
};
ATTRIBUTE_GROUPS(lp55xx_led);

static int lp55xx_set_brightness(struct led_classdev *cdev,
			     enum led_brightness brightness)
{
	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
	struct lp55xx_device_config *cfg = led->chip->cfg;

	led->brightness = (u8)brightness;
	return cfg->brightness_fn(led);
}

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_blocking = lp55xx_set_brightness;
	led->cdev.groups = lp55xx_led_groups;

	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;
	}

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

	/* 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);

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

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, false, 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_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;

		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);
	}
}
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);

struct lp55xx_platform_data *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 ERR_PTR(-ENOMEM);

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

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

	return pdata;
}
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
44a1255b	130	static struct attribute *lp55xx_led_attrs[] = {
a96bfa13 MWK	131	&dev_attr_led_current.attr,
a96bfa13 MWK	132	&dev_attr_max_current.attr,
0e202346 MWK	133	NULL,
0e202346 MWK	134	};
44a1255b	135	ATTRIBUTE_GROUPS(lp55xx_led);
0e202346	136
95b2af63	137	static int lp55xx_set_brightness(struct led_classdev *cdev,
0e202346 MWK	138	enum led_brightness brightness)
0e202346 MWK	139	{
a6e4679a	140	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
95b2af63	141	struct lp55xx_device_config *cfg = led->chip->cfg;
a6e4679a MWK	142
a6e4679a MWK	143	led->brightness = (u8)brightness;
95b2af63	144	return cfg->brightness_fn(led);
0e202346 MWK	145	}
0e202346 MWK	146
9e9b3db1 MWK	147	static int lp55xx_init_led(struct lp55xx_led *led,
	148	struct lp55xx_chip *chip, int chan)
	149	{
0e202346 MWK	150	struct lp55xx_platform_data *pdata = chip->pdata;
	151	struct lp55xx_device_config *cfg = chip->cfg;
	152	struct device *dev = &chip->cl->dev;
	153	char name[32];
	154	int ret;
	155	int max_channel = cfg->max_channel;
	156
	157	if (chan >= max_channel) {
	158	dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
	159	return -EINVAL;
	160	}
	161
	162	if (pdata->led_config[chan].led_current == 0)
	163	return 0;
	164
	165	led->led_current = pdata->led_config[chan].led_current;
	166	led->max_current = pdata->led_config[chan].max_current;
	167	led->chan_nr = pdata->led_config[chan].chan_nr;
f65f0a1a	168	led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
0e202346 MWK	169
	170	if (led->chan_nr >= max_channel) {
	171	dev_err(dev, "Use channel numbers between 0 and %d\n",
	172	max_channel - 1);
	173	return -EINVAL;
	174	}
	175
95b2af63	176	led->cdev.brightness_set_blocking = lp55xx_set_brightness;
44a1255b	177	led->cdev.groups = lp55xx_led_groups;
0e202346 MWK	178
	179	if (pdata->led_config[chan].name) {
	180	led->cdev.name = pdata->led_config[chan].name;
	181	} else {
	182	snprintf(name, sizeof(name), "%s:channel%d",
	183	pdata->label ? : chip->cl->name, chan);
	184	led->cdev.name = name;
	185	}
	186
0e202346 MWK	187	ret = led_classdev_register(dev, &led->cdev);
	188	if (ret) {
	189	dev_err(dev, "led register err: %d\n", ret);
	190	return ret;
	191	}
	192
9e9b3db1 MWK	193	return 0;
	194	}
	195
10c06d17 MWK	196	static void lp55xx_firmware_loaded(const struct firmware fw, void context)
	197	{
	198	struct lp55xx_chip *chip = context;
	199	struct device *dev = &chip->cl->dev;
93ad8a1d	200	enum lp55xx_engine_index idx = chip->engine_idx;
10c06d17 MWK	201
	202	if (!fw) {
	203	dev_err(dev, "firmware request failed\n");
fbc85178	204	return;
10c06d17 MWK	205	}
	206
	207	/* handling firmware data is chip dependent */
	208	mutex_lock(&chip->lock);
	209
93ad8a1d	210	chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD;
10c06d17 MWK	211	chip->fw = fw;
	212	if (chip->cfg->firmware_cb)
	213	chip->cfg->firmware_cb(chip);
	214
	215	mutex_unlock(&chip->lock);
	216
10c06d17 MWK	217	/* firmware should be released for other channel use */
10c06d17 MWK	218	release_firmware(chip->fw);
fbc85178	219	chip->fw = NULL;
10c06d17 MWK	220	}
	221
	222	static int lp55xx_request_firmware(struct lp55xx_chip *chip)
	223	{
	224	const char *name = chip->cl->name;
	225	struct device *dev = &chip->cl->dev;
	226
b6789320	227	return request_firmware_nowait(THIS_MODULE, false, name, dev,
10c06d17 MWK	228	GFP_KERNEL, chip, lp55xx_firmware_loaded);
	229	}
	230
	231	static ssize_t lp55xx_show_engine_select(struct device *dev,
	232	struct device_attribute *attr,
	233	char *buf)
	234	{
	235	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	236	struct lp55xx_chip *chip = led->chip;
	237
	238	return sprintf(buf, "%d\n", chip->engine_idx);
	239	}
	240
	241	static ssize_t lp55xx_store_engine_select(struct device *dev,
	242	struct device_attribute *attr,
	243	const char *buf, size_t len)
	244	{
	245	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	246	struct lp55xx_chip *chip = led->chip;
	247	unsigned long val;
	248	int ret;
	249
	250	if (kstrtoul(buf, 0, &val))
	251	return -EINVAL;
	252
	253	/* select the engine to be run */
	254
	255	switch (val) {
	256	case LP55XX_ENGINE_1:
	257	case LP55XX_ENGINE_2:
	258	case LP55XX_ENGINE_3:
	259	mutex_lock(&chip->lock);
	260	chip->engine_idx = val;
	261	ret = lp55xx_request_firmware(chip);
	262	mutex_unlock(&chip->lock);
	263	break;
	264	default:
	265	dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val);
	266	return -EINVAL;
	267	}
	268
	269	if (ret) {
	270	dev_err(dev, "request firmware err: %d\n", ret);
	271	return ret;
	272	}
	273
	274	return len;
	275	}
	276
	277	static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start)
	278	{
	279	if (chip->cfg->run_engine)
	280	chip->cfg->run_engine(chip, start);
	281	}
	282
	283	static ssize_t lp55xx_store_engine_run(struct device *dev,
	284	struct device_attribute *attr,
	285	const char *buf, size_t len)
	286	{
	287	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	288	struct lp55xx_chip *chip = led->chip;
	289	unsigned long val;
	290
	291	if (kstrtoul(buf, 0, &val))
292	return -EINVAL;
293
294	/* run or stop the selected engine */
295
296	if (val <= 0) {
297	lp55xx_run_engine(chip, false);
298	return len;
299	}
300
301	mutex_lock(&chip->lock);
302	lp55xx_run_engine(chip, true);
303	mutex_unlock(&chip->lock);
304
305	return len;
306	}
307
308	static DEVICE_ATTR(select_engine, S_IRUGO \| S_IWUSR,
309	lp55xx_show_engine_select, lp55xx_store_engine_select);
310	static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run);
311
b3b6f811	312	static struct attribute *lp55xx_engine_attributes[] = {
10c06d17 MWK	313	&dev_attr_select_engine.attr,
10c06d17 MWK	314	&dev_attr_run_engine.attr,
b3b6f811 MWK	315	NULL,
	316	};
	317
	318	static const struct attribute_group lp55xx_engine_attr_group = {
	319	.attrs = lp55xx_engine_attributes,
	320	};
	321
c93d08fa MWK	322	int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
	323	{
	324	return i2c_smbus_write_byte_data(chip->cl, reg, val);
	325	}
	326	EXPORT_SYMBOL_GPL(lp55xx_write);
	327
	328	int lp55xx_read(struct lp55xx_chip chip, u8 reg, u8 val)
	329	{
	330	s32 ret;
	331
	332	ret = i2c_smbus_read_byte_data(chip->cl, reg);
	333	if (ret < 0)
	334	return ret;
	335
	336	*val = ret;
	337	return 0;
	338	}
	339	EXPORT_SYMBOL_GPL(lp55xx_read);
	340
	341	int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
	342	{
	343	int ret;
	344	u8 tmp;
	345
	346	ret = lp55xx_read(chip, reg, &tmp);
	347	if (ret)
	348	return ret;
	349
	350	tmp &= ~mask;
	351	tmp \|= val & mask;
	352
	353	return lp55xx_write(chip, reg, tmp);
	354	}
	355	EXPORT_SYMBOL_GPL(lp55xx_update_bits);
	356
53b41922 KM	357	bool lp55xx_is_extclk_used(struct lp55xx_chip *chip)
	358	{
	359	struct clk *clk;
	360	int err;
	361
	362	clk = devm_clk_get(&chip->cl->dev, "32k_clk");
	363	if (IS_ERR(clk))
	364	goto use_internal_clk;
	365
	366	err = clk_prepare_enable(clk);
	367	if (err)
	368	goto use_internal_clk;
	369
	370	if (clk_get_rate(clk) != LP55XX_CLK_32K) {
	371	clk_disable_unprepare(clk);
	372	goto use_internal_clk;
	373	}
	374
	375	dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K);
	376
	377	chip->clk = clk;
	378	return true;
	379
	380	use_internal_clk:
	381	dev_info(&chip->cl->dev, "internal clock used\n");
	382	return false;
	383	}
	384	EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used);
	385
a85908dd MWK	386	int lp55xx_init_device(struct lp55xx_chip *chip)
	387	{
	388	struct lp55xx_platform_data *pdata;
48068d5d	389	struct lp55xx_device_config *cfg;
a85908dd MWK	390	struct device *dev = &chip->cl->dev;
	391	int ret = 0;
	392
	393	WARN_ON(!chip);
	394
	395	pdata = chip->pdata;
48068d5d	396	cfg = chip->cfg;
a85908dd	397
48068d5d	398	if (!pdata \|\| !cfg)
a85908dd MWK	399	return -EINVAL;
a85908dd MWK	400
30dae2f9 SR	401	if (gpio_is_valid(pdata->enable_gpio)) {
	402	ret = devm_gpio_request_one(dev, pdata->enable_gpio,
	403	GPIOF_DIR_OUT, "lp5523_enable");
a85908dd	404	if (ret < 0) {
30dae2f9 SR	405	dev_err(dev, "could not acquire enable gpio (err=%d)\n",
30dae2f9 SR	406	ret);
a85908dd MWK	407	goto err;
a85908dd MWK	408	}
a85908dd	409
30dae2f9	410	gpio_set_value(pdata->enable_gpio, 0);
a85908dd	411	usleep_range(1000, 2000); /* Keep enable down at least 1ms */
30dae2f9	412	gpio_set_value(pdata->enable_gpio, 1);
a85908dd MWK	413	usleep_range(1000, 2000); /* 500us abs min. */
	414	}
	415
48068d5d MWK	416	lp55xx_reset_device(chip);
	417
	418	/*
	419	* Exact value is not available. 10 - 20ms
	420	* appears to be enough for reset.
	421	*/
	422	usleep_range(10000, 20000);
	423
e3a700d8 MWK	424	ret = lp55xx_detect_device(chip);
	425	if (ret) {
	426	dev_err(dev, "device detection err: %d\n", ret);
	427	goto err;
	428	}
	429
ffbdccdb MWK	430	/* chip specific initialization */
ffbdccdb MWK	431	ret = lp55xx_post_init_device(chip);
22ebeb48 MWK	432	if (ret) {
	433	dev_err(dev, "post init device err: %d\n", ret);
	434	goto err_post_init;
	435	}
ffbdccdb MWK	436
	437	return 0;
	438
22ebeb48	439	err_post_init:
6ce61762 MWK	440	lp55xx_deinit_device(chip);
	441	err:
	442	return ret;
	443	}
	444	EXPORT_SYMBOL_GPL(lp55xx_init_device);
	445
	446	void lp55xx_deinit_device(struct lp55xx_chip *chip)
	447	{
	448	struct lp55xx_platform_data *pdata = chip->pdata;
	449
53b41922 KM	450	if (chip->clk)
	451	clk_disable_unprepare(chip->clk);
	452
30dae2f9 SR	453	if (gpio_is_valid(pdata->enable_gpio))
30dae2f9 SR	454	gpio_set_value(pdata->enable_gpio, 0);
a85908dd	455	}
6ce61762	456	EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
a85908dd	457
9e9b3db1 MWK	458	int lp55xx_register_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	459	{
	460	struct lp55xx_platform_data *pdata = chip->pdata;
	461	struct lp55xx_device_config *cfg = chip->cfg;
	462	int num_channels = pdata->num_channels;
	463	struct lp55xx_led *each;
	464	u8 led_current;
	465	int ret;
	466	int i;
	467
95b2af63	468	if (!cfg->brightness_fn) {
9e9b3db1 MWK	469	dev_err(&chip->cl->dev, "empty brightness configuration\n");
	470	return -EINVAL;
	471	}
	472
	473	for (i = 0; i < num_channels; i++) {
	474
	475	/* do not initialize channels that are not connected */
	476	if (pdata->led_config[i].led_current == 0)
	477	continue;
	478
	479	led_current = pdata->led_config[i].led_current;
	480	each = led + i;
	481	ret = lp55xx_init_led(each, chip, i);
	482	if (ret)
	483	goto err_init_led;
	484
9e9b3db1 MWK	485	chip->num_leds++;
	486	each->chip = chip;
	487
	488	/* setting led current at each channel */
	489	if (cfg->set_led_current)
	490	cfg->set_led_current(each, led_current);
	491	}
	492
	493	return 0;
	494
	495	err_init_led:
d9067d28	496	lp55xx_unregister_leds(led, chip);
9e9b3db1 MWK	497	return ret;
	498	}
	499	EXPORT_SYMBOL_GPL(lp55xx_register_leds);
	500
c3a68ebf MWK	501	void lp55xx_unregister_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	502	{
	503	int i;
	504	struct lp55xx_led *each;
c3a68ebf MWK	505
	506	for (i = 0; i < chip->num_leds; i++) {
	507	each = led + i;
c3a68ebf	508	led_classdev_unregister(&each->cdev);
c3a68ebf MWK	509	}
	510	}
	511	EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);
	512
b3b6f811 MWK	513	int lp55xx_register_sysfs(struct lp55xx_chip *chip)
	514	{
	515	struct device *dev = &chip->cl->dev;
240085e2 MWK	516	struct lp55xx_device_config *cfg = chip->cfg;
	517	int ret;
	518
	519	if (!cfg->run_engine \|\| !cfg->firmware_cb)
	520	goto dev_specific_attrs;
	521
	522	ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
	523	if (ret)
	524	return ret;
b3b6f811	525
240085e2 MWK	526	dev_specific_attrs:
	527	return cfg->dev_attr_group ?
	528	sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
b3b6f811 MWK	529	}
	530	EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
	531
ba6fa846 MWK	532	void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
	533	{
	534	struct device *dev = &chip->cl->dev;
	535	struct lp55xx_device_config *cfg = chip->cfg;
	536
	537	if (cfg->dev_attr_group)
	538	sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);
	539
	540	sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
	541	}
	542	EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
	543
ed133352 MK	544	struct lp55xx_platform_data lp55xx_of_populate_pdata(struct device dev,
ed133352 MK	545	struct device_node *np)
7542a04b	546	{
2dac9128	547	struct device_node *child;
7542a04b	548	struct lp55xx_platform_data *pdata;
2dac9128 KM	549	struct lp55xx_led_config *cfg;
	550	int num_channels;
	551	int i = 0;
7542a04b LW	552
	553	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	554	if (!pdata)
ed133352	555	return ERR_PTR(-ENOMEM);
7542a04b	556
2dac9128 KM	557	num_channels = of_get_child_count(np);
	558	if (num_channels == 0) {
	559	dev_err(dev, "no LED channels\n");
ed133352	560	return ERR_PTR(-EINVAL);
2dac9128	561	}
7542a04b	562
2dac9128 KM	563	cfg = devm_kzalloc(dev, sizeof(cfg) num_channels, GFP_KERNEL);
2dac9128 KM	564	if (!cfg)
ed133352	565	return ERR_PTR(-ENOMEM);
7542a04b	566
2dac9128 KM	567	pdata->led_config = &cfg[0];
	568	pdata->num_channels = num_channels;
	569
	570	for_each_child_of_node(np, child) {
	571	cfg[i].chan_nr = i;
	572
	573	of_property_read_string(child, "chan-name", &cfg[i].name);
	574	of_property_read_u8(child, "led-cur", &cfg[i].led_current);
	575	of_property_read_u8(child, "max-cur", &cfg[i].max_current);
f65f0a1a LW	576	cfg[i].default_trigger =
f65f0a1a LW	577	of_get_property(child, "linux,default-trigger", NULL);
2dac9128 KM	578
2dac9128 KM	579	i++;
7542a04b	580	}
2dac9128 KM	581
	582	of_property_read_string(np, "label", &pdata->label);
	583	of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
	584
30dae2f9 SR	585	pdata->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
30dae2f9 SR	586
33b3a561 KM	587	/* LP8501 specific */
	588	of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel);
	589
ed133352	590	return pdata;
7542a04b LW	591	}
	592	EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata);
	593
c93d08fa MWK	594	MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
	595	MODULE_DESCRIPTION("LP55xx Common Driver");
	596	MODULE_LICENSE("GPL");