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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * LP5521/LP5523/LP55231/LP5562 Common Driver
 *
 * Copyright 2012 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
 *
 * 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_kcalloc(dev, num_channels, sizeof(*cfg), 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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
c93d08fa	2	/*
ff45262a	3	* LP5521/LP5523/LP55231/LP5562 Common Driver
c93d08fa MWK	4	*
	5	* Copyright 2012 Texas Instruments
	6	*
	7	* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
	8	*
c93d08fa MWK	9	* Derived from leds-lp5521.c, leds-lp5523.c
	10	*/
	11
53b41922	12	#include <linux/clk.h>
a85908dd	13	#include <linux/delay.h>
10c06d17	14	#include <linux/firmware.h>
c93d08fa MWK	15	#include <linux/i2c.h>
	16	#include <linux/leds.h>
	17	#include <linux/module.h>
	18	#include <linux/platform_data/leds-lp55xx.h>
7542a04b	19	#include <linux/slab.h>
30dae2f9 SR	20	#include <linux/gpio.h>
30dae2f9 SR	21	#include <linux/of_gpio.h>
c93d08fa MWK	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
44a1255b	127	static struct attribute *lp55xx_led_attrs[] = {
a96bfa13 MWK	128	&dev_attr_led_current.attr,
a96bfa13 MWK	129	&dev_attr_max_current.attr,
0e202346 MWK	130	NULL,
0e202346 MWK	131	};
44a1255b	132	ATTRIBUTE_GROUPS(lp55xx_led);
0e202346	133
95b2af63	134	static int lp55xx_set_brightness(struct led_classdev *cdev,
0e202346 MWK	135	enum led_brightness brightness)
0e202346 MWK	136	{
a6e4679a	137	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
95b2af63	138	struct lp55xx_device_config *cfg = led->chip->cfg;
a6e4679a MWK	139
a6e4679a MWK	140	led->brightness = (u8)brightness;
95b2af63	141	return cfg->brightness_fn(led);
0e202346 MWK	142	}
0e202346 MWK	143
9e9b3db1 MWK	144	static int lp55xx_init_led(struct lp55xx_led *led,
	145	struct lp55xx_chip *chip, int chan)
	146	{
0e202346 MWK	147	struct lp55xx_platform_data *pdata = chip->pdata;
	148	struct lp55xx_device_config *cfg = chip->cfg;
	149	struct device *dev = &chip->cl->dev;
	150	char name[32];
	151	int ret;
	152	int max_channel = cfg->max_channel;
	153
	154	if (chan >= max_channel) {
	155	dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
	156	return -EINVAL;
	157	}
	158
	159	if (pdata->led_config[chan].led_current == 0)
	160	return 0;
	161
	162	led->led_current = pdata->led_config[chan].led_current;
	163	led->max_current = pdata->led_config[chan].max_current;
	164	led->chan_nr = pdata->led_config[chan].chan_nr;
f65f0a1a	165	led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
0e202346 MWK	166
	167	if (led->chan_nr >= max_channel) {
	168	dev_err(dev, "Use channel numbers between 0 and %d\n",
	169	max_channel - 1);
	170	return -EINVAL;
	171	}
	172
95b2af63	173	led->cdev.brightness_set_blocking = lp55xx_set_brightness;
44a1255b	174	led->cdev.groups = lp55xx_led_groups;
0e202346 MWK	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
0e202346 MWK	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
9e9b3db1 MWK	190	return 0;
	191	}
	192
10c06d17 MWK	193	static void lp55xx_firmware_loaded(const struct firmware fw, void context)
	194	{
	195	struct lp55xx_chip *chip = context;
	196	struct device *dev = &chip->cl->dev;
93ad8a1d	197	enum lp55xx_engine_index idx = chip->engine_idx;
10c06d17 MWK	198
	199	if (!fw) {
	200	dev_err(dev, "firmware request failed\n");
5ddb0869	201	return;
10c06d17 MWK	202	}
	203
	204	/* handling firmware data is chip dependent */
	205	mutex_lock(&chip->lock);
	206
93ad8a1d	207	chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD;
10c06d17 MWK	208	chip->fw = fw;
	209	if (chip->cfg->firmware_cb)
	210	chip->cfg->firmware_cb(chip);
	211
	212	mutex_unlock(&chip->lock);
	213
10c06d17 MWK	214	/* firmware should be released for other channel use */
10c06d17 MWK	215	release_firmware(chip->fw);
5ddb0869	216	chip->fw = NULL;
10c06d17 MWK	217	}
	218
	219	static int lp55xx_request_firmware(struct lp55xx_chip *chip)
	220	{
	221	const char *name = chip->cl->name;
	222	struct device *dev = &chip->cl->dev;
	223
b6789320	224	return request_firmware_nowait(THIS_MODULE, false, name, dev,
10c06d17 MWK	225	GFP_KERNEL, chip, lp55xx_firmware_loaded);
	226	}
	227
	228	static ssize_t lp55xx_show_engine_select(struct device *dev,
	229	struct device_attribute *attr,
	230	char *buf)
	231	{
	232	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	233	struct lp55xx_chip *chip = led->chip;
	234
	235	return sprintf(buf, "%d\n", chip->engine_idx);
	236	}
	237
	238	static ssize_t lp55xx_store_engine_select(struct device *dev,
	239	struct device_attribute *attr,
	240	const char *buf, size_t len)
	241	{
	242	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	243	struct lp55xx_chip *chip = led->chip;
	244	unsigned long val;
	245	int ret;
	246
	247	if (kstrtoul(buf, 0, &val))
	248	return -EINVAL;
	249
	250	/* select the engine to be run */
	251
	252	switch (val) {
	253	case LP55XX_ENGINE_1:
	254	case LP55XX_ENGINE_2:
	255	case LP55XX_ENGINE_3:
	256	mutex_lock(&chip->lock);
	257	chip->engine_idx = val;
	258	ret = lp55xx_request_firmware(chip);
	259	mutex_unlock(&chip->lock);
	260	break;
	261	default:
	262	dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val);
	263	return -EINVAL;
	264	}
	265
	266	if (ret) {
	267	dev_err(dev, "request firmware err: %d\n", ret);
	268	return ret;
	269	}
	270
	271	return len;
	272	}
	273
	274	static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start)
	275	{
	276	if (chip->cfg->run_engine)
	277	chip->cfg->run_engine(chip, start);
	278	}
	279
	280	static ssize_t lp55xx_store_engine_run(struct device *dev,
	281	struct device_attribute *attr,
	282	const char *buf, size_t len)
	283	{
	284	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	285	struct lp55xx_chip *chip = led->chip;
	286	unsigned long val;
	287
	288	if (kstrtoul(buf, 0, &val))
289	return -EINVAL;
290
291	/* run or stop the selected engine */
292
293	if (val <= 0) {
294	lp55xx_run_engine(chip, false);
295	return len;
296	}
297
298	mutex_lock(&chip->lock);
299	lp55xx_run_engine(chip, true);
300	mutex_unlock(&chip->lock);
301
302	return len;
303	}
304
305	static DEVICE_ATTR(select_engine, S_IRUGO \| S_IWUSR,
306	lp55xx_show_engine_select, lp55xx_store_engine_select);
307	static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run);
308
b3b6f811	309	static struct attribute *lp55xx_engine_attributes[] = {
10c06d17 MWK	310	&dev_attr_select_engine.attr,
10c06d17 MWK	311	&dev_attr_run_engine.attr,
b3b6f811 MWK	312	NULL,
	313	};
	314
	315	static const struct attribute_group lp55xx_engine_attr_group = {
	316	.attrs = lp55xx_engine_attributes,
	317	};
	318
c93d08fa MWK	319	int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
	320	{
	321	return i2c_smbus_write_byte_data(chip->cl, reg, val);
	322	}
	323	EXPORT_SYMBOL_GPL(lp55xx_write);
	324
	325	int lp55xx_read(struct lp55xx_chip chip, u8 reg, u8 val)
	326	{
	327	s32 ret;
	328
	329	ret = i2c_smbus_read_byte_data(chip->cl, reg);
	330	if (ret < 0)
	331	return ret;
	332
	333	*val = ret;
	334	return 0;
	335	}
	336	EXPORT_SYMBOL_GPL(lp55xx_read);
	337
	338	int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
	339	{
	340	int ret;
	341	u8 tmp;
	342
	343	ret = lp55xx_read(chip, reg, &tmp);
	344	if (ret)
	345	return ret;
	346
	347	tmp &= ~mask;
	348	tmp \|= val & mask;
	349
	350	return lp55xx_write(chip, reg, tmp);
	351	}
	352	EXPORT_SYMBOL_GPL(lp55xx_update_bits);
	353
53b41922 KM	354	bool lp55xx_is_extclk_used(struct lp55xx_chip *chip)
	355	{
	356	struct clk *clk;
	357	int err;
	358
	359	clk = devm_clk_get(&chip->cl->dev, "32k_clk");
	360	if (IS_ERR(clk))
	361	goto use_internal_clk;
	362
	363	err = clk_prepare_enable(clk);
	364	if (err)
	365	goto use_internal_clk;
	366
	367	if (clk_get_rate(clk) != LP55XX_CLK_32K) {
	368	clk_disable_unprepare(clk);
	369	goto use_internal_clk;
	370	}
	371
	372	dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K);
	373
	374	chip->clk = clk;
	375	return true;
	376
	377	use_internal_clk:
	378	dev_info(&chip->cl->dev, "internal clock used\n");
	379	return false;
	380	}
	381	EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used);
	382
a85908dd MWK	383	int lp55xx_init_device(struct lp55xx_chip *chip)
	384	{
	385	struct lp55xx_platform_data *pdata;
48068d5d	386	struct lp55xx_device_config *cfg;
a85908dd MWK	387	struct device *dev = &chip->cl->dev;
	388	int ret = 0;
	389
	390	WARN_ON(!chip);
	391
	392	pdata = chip->pdata;
48068d5d	393	cfg = chip->cfg;
a85908dd	394
48068d5d	395	if (!pdata \|\| !cfg)
a85908dd MWK	396	return -EINVAL;
a85908dd MWK	397
30dae2f9 SR	398	if (gpio_is_valid(pdata->enable_gpio)) {
	399	ret = devm_gpio_request_one(dev, pdata->enable_gpio,
	400	GPIOF_DIR_OUT, "lp5523_enable");
a85908dd	401	if (ret < 0) {
30dae2f9 SR	402	dev_err(dev, "could not acquire enable gpio (err=%d)\n",
30dae2f9 SR	403	ret);
a85908dd MWK	404	goto err;
a85908dd MWK	405	}
a85908dd	406
30dae2f9	407	gpio_set_value(pdata->enable_gpio, 0);
a85908dd	408	usleep_range(1000, 2000); /* Keep enable down at least 1ms */
30dae2f9	409	gpio_set_value(pdata->enable_gpio, 1);
a85908dd MWK	410	usleep_range(1000, 2000); /* 500us abs min. */
	411	}
	412
48068d5d MWK	413	lp55xx_reset_device(chip);
	414
	415	/*
	416	* Exact value is not available. 10 - 20ms
	417	* appears to be enough for reset.
	418	*/
	419	usleep_range(10000, 20000);
	420
e3a700d8 MWK	421	ret = lp55xx_detect_device(chip);
	422	if (ret) {
	423	dev_err(dev, "device detection err: %d\n", ret);
	424	goto err;
	425	}
	426
ffbdccdb MWK	427	/* chip specific initialization */
ffbdccdb MWK	428	ret = lp55xx_post_init_device(chip);
22ebeb48 MWK	429	if (ret) {
	430	dev_err(dev, "post init device err: %d\n", ret);
	431	goto err_post_init;
	432	}
ffbdccdb MWK	433
	434	return 0;
	435
22ebeb48	436	err_post_init:
6ce61762 MWK	437	lp55xx_deinit_device(chip);
	438	err:
	439	return ret;
	440	}
	441	EXPORT_SYMBOL_GPL(lp55xx_init_device);
	442
	443	void lp55xx_deinit_device(struct lp55xx_chip *chip)
	444	{
	445	struct lp55xx_platform_data *pdata = chip->pdata;
	446
53b41922 KM	447	if (chip->clk)
	448	clk_disable_unprepare(chip->clk);
	449
30dae2f9 SR	450	if (gpio_is_valid(pdata->enable_gpio))
30dae2f9 SR	451	gpio_set_value(pdata->enable_gpio, 0);
a85908dd	452	}
6ce61762	453	EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
a85908dd	454
9e9b3db1 MWK	455	int lp55xx_register_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	456	{
	457	struct lp55xx_platform_data *pdata = chip->pdata;
	458	struct lp55xx_device_config *cfg = chip->cfg;
	459	int num_channels = pdata->num_channels;
	460	struct lp55xx_led *each;
	461	u8 led_current;
	462	int ret;
	463	int i;
	464
95b2af63	465	if (!cfg->brightness_fn) {
9e9b3db1 MWK	466	dev_err(&chip->cl->dev, "empty brightness configuration\n");
	467	return -EINVAL;
	468	}
	469
	470	for (i = 0; i < num_channels; i++) {
	471
	472	/* do not initialize channels that are not connected */
	473	if (pdata->led_config[i].led_current == 0)
	474	continue;
	475
	476	led_current = pdata->led_config[i].led_current;
	477	each = led + i;
	478	ret = lp55xx_init_led(each, chip, i);
	479	if (ret)
	480	goto err_init_led;
	481
9e9b3db1 MWK	482	chip->num_leds++;
	483	each->chip = chip;
	484
	485	/* setting led current at each channel */
	486	if (cfg->set_led_current)
	487	cfg->set_led_current(each, led_current);
	488	}
	489
	490	return 0;
	491
	492	err_init_led:
d9067d28	493	lp55xx_unregister_leds(led, chip);
9e9b3db1 MWK	494	return ret;
	495	}
	496	EXPORT_SYMBOL_GPL(lp55xx_register_leds);
	497
c3a68ebf MWK	498	void lp55xx_unregister_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	499	{
	500	int i;
	501	struct lp55xx_led *each;
c3a68ebf MWK	502
	503	for (i = 0; i < chip->num_leds; i++) {
	504	each = led + i;
c3a68ebf	505	led_classdev_unregister(&each->cdev);
c3a68ebf MWK	506	}
	507	}
	508	EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);
	509
b3b6f811 MWK	510	int lp55xx_register_sysfs(struct lp55xx_chip *chip)
	511	{
	512	struct device *dev = &chip->cl->dev;
240085e2 MWK	513	struct lp55xx_device_config *cfg = chip->cfg;
	514	int ret;
	515
	516	if (!cfg->run_engine \|\| !cfg->firmware_cb)
	517	goto dev_specific_attrs;
	518
	519	ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
	520	if (ret)
	521	return ret;
b3b6f811	522
240085e2 MWK	523	dev_specific_attrs:
	524	return cfg->dev_attr_group ?
	525	sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
b3b6f811 MWK	526	}
	527	EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
	528
ba6fa846 MWK	529	void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
	530	{
	531	struct device *dev = &chip->cl->dev;
	532	struct lp55xx_device_config *cfg = chip->cfg;
	533
	534	if (cfg->dev_attr_group)
	535	sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);
	536
	537	sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
	538	}
	539	EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
	540
ed133352 MK	541	struct lp55xx_platform_data lp55xx_of_populate_pdata(struct device dev,
ed133352 MK	542	struct device_node *np)
7542a04b	543	{
2dac9128	544	struct device_node *child;
7542a04b	545	struct lp55xx_platform_data *pdata;
2dac9128 KM	546	struct lp55xx_led_config *cfg;
	547	int num_channels;
	548	int i = 0;
7542a04b LW	549
	550	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	551	if (!pdata)
ed133352	552	return ERR_PTR(-ENOMEM);
7542a04b	553
2dac9128 KM	554	num_channels = of_get_child_count(np);
	555	if (num_channels == 0) {
	556	dev_err(dev, "no LED channels\n");
ed133352	557	return ERR_PTR(-EINVAL);
2dac9128	558	}
7542a04b	559
a86854d0	560	cfg = devm_kcalloc(dev, num_channels, sizeof(*cfg), GFP_KERNEL);
2dac9128	561	if (!cfg)
ed133352	562	return ERR_PTR(-ENOMEM);
7542a04b	563
2dac9128 KM	564	pdata->led_config = &cfg[0];
	565	pdata->num_channels = num_channels;
	566
	567	for_each_child_of_node(np, child) {
	568	cfg[i].chan_nr = i;
	569
	570	of_property_read_string(child, "chan-name", &cfg[i].name);
	571	of_property_read_u8(child, "led-cur", &cfg[i].led_current);
	572	of_property_read_u8(child, "max-cur", &cfg[i].max_current);
f65f0a1a LW	573	cfg[i].default_trigger =
f65f0a1a LW	574	of_get_property(child, "linux,default-trigger", NULL);
2dac9128 KM	575
2dac9128 KM	576	i++;
7542a04b	577	}
2dac9128 KM	578
	579	of_property_read_string(np, "label", &pdata->label);
	580	of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
	581
30dae2f9 SR	582	pdata->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
30dae2f9 SR	583
33b3a561 KM	584	/* LP8501 specific */
	585	of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel);
	586
ed133352	587	return pdata;
7542a04b LW	588	}
	589	EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata);
	590
c93d08fa MWK	591	MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
	592	MODULE_DESCRIPTION("LP55xx Common Driver");
	593	MODULE_LICENSE("GPL");