[mirror_ubuntu-zesty-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 "leds-lp55xx-common.h"

/* External clock rate */
#define LP55XX_CLK_32K			32768

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

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

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

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

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

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

	usleep_range(1000, 2000);

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

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

	return 0;
}

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

	if (!cfg->post_init_device)
		return 0;

	return cfg->post_init_device(chip);
}

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

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

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

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

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

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

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

	return len;
}

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

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

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

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

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

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

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

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

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

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

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

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

	led->cdev.brightness_set = lp55xx_set_brightness;

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

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

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

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

	return 0;
}

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

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

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

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

	mutex_unlock(&chip->lock);

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

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

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

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

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

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

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

	/* select the engine to be run */

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

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

	return len;
}

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

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

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

	/* run or stop the selected engine */

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

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

	return len;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	chip->clk = clk;
	return true;

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

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

	WARN_ON(!chip);

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

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

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

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

	lp55xx_reset_device(chip);

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

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

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

	return 0;

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;

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

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

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

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

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

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

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

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

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

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

int lp55xx_of_populate_pdata(struct device *dev, struct device_node *np)
{
	struct lp55xx_platform_data *pdata;
	u8 led_cur[3];
	u8 max_cur[3];
	u8 clock_mode;
	u8 num_channel;
	const char *label;
	struct lp55xx_led_config *led_config;
	int ret;
	int i;

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

	ret = of_property_read_u8(np, "num-channel", &num_channel);
	if (ret < 0)
		return ret;
	ret = of_property_read_u8_array(np, "led-cur", led_cur, num_channel);
	if (ret < 0)
		return ret;
	ret = of_property_read_u8_array(np, "max-cur", max_cur, num_channel);
	if (ret < 0)
		return ret;
	ret = of_property_read_string(np, "label", &label);
	if (ret < 0)
		return ret;
	ret = of_property_read_u8_array(np, "clock-mode", &clock_mode, 1);
	if (ret < 0)
		return ret;

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

	for (i = 0; i < num_channel; i++) {
		led_config[i].chan_nr = i;
		led_config[i].led_current = led_cur[i];
		led_config[i].max_current = max_cur[i];
	}
	pdata->label = kzalloc(sizeof(char) * 32, GFP_KERNEL);
	strcpy((char *)pdata->label, (char *) label);
	pdata->led_config = &led_config[0];
	pdata->num_channels = num_channel;
	pdata->clock_mode = clock_mode;
	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>
c93d08fa MWK	23
	24	#include "leds-lp55xx-common.h"
	25
53b41922 KM	26	/* External clock rate */
	27	#define LP55XX_CLK_32K 32768
	28
a6e4679a MWK	29	static struct lp55xx_led cdev_to_lp55xx_led(struct led_classdev cdev)
	30	{
	31	return container_of(cdev, struct lp55xx_led, cdev);
	32	}
	33
a96bfa13 MWK	34	static struct lp55xx_led dev_to_lp55xx_led(struct device dev)
	35	{
	36	return cdev_to_lp55xx_led(dev_get_drvdata(dev));
	37	}
	38
48068d5d MWK	39	static void lp55xx_reset_device(struct lp55xx_chip *chip)
	40	{
	41	struct lp55xx_device_config *cfg = chip->cfg;
	42	u8 addr = cfg->reset.addr;
	43	u8 val = cfg->reset.val;
	44
	45	/* no error checking here because no ACK from the device after reset */
	46	lp55xx_write(chip, addr, val);
	47	}
	48
e3a700d8 MWK	49	static int lp55xx_detect_device(struct lp55xx_chip *chip)
	50	{
	51	struct lp55xx_device_config *cfg = chip->cfg;
	52	u8 addr = cfg->enable.addr;
	53	u8 val = cfg->enable.val;
	54	int ret;
	55
	56	ret = lp55xx_write(chip, addr, val);
	57	if (ret)
	58	return ret;
	59
	60	usleep_range(1000, 2000);
	61
	62	ret = lp55xx_read(chip, addr, &val);
	63	if (ret)
	64	return ret;
	65
	66	if (val != cfg->enable.val)
	67	return -ENODEV;
	68
	69	return 0;
	70	}
	71
ffbdccdb MWK	72	static int lp55xx_post_init_device(struct lp55xx_chip *chip)
	73	{
	74	struct lp55xx_device_config *cfg = chip->cfg;
	75
	76	if (!cfg->post_init_device)
	77	return 0;
	78
	79	return cfg->post_init_device(chip);
	80	}
	81
a96bfa13 MWK	82	static ssize_t lp55xx_show_current(struct device *dev,
	83	struct device_attribute *attr,
	84	char *buf)
	85	{
	86	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	87
24d32128	88	return scnprintf(buf, PAGE_SIZE, "%d\n", led->led_current);
a96bfa13 MWK	89	}
	90
	91	static ssize_t lp55xx_store_current(struct device *dev,
	92	struct device_attribute *attr,
	93	const char *buf, size_t len)
	94	{
	95	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	96	struct lp55xx_chip *chip = led->chip;
	97	unsigned long curr;
	98
	99	if (kstrtoul(buf, 0, &curr))
	100	return -EINVAL;
	101
	102	if (curr > led->max_current)
	103	return -EINVAL;
	104
	105	if (!chip->cfg->set_led_current)
	106	return len;
	107
	108	mutex_lock(&chip->lock);
	109	chip->cfg->set_led_current(led, (u8)curr);
	110	mutex_unlock(&chip->lock);
	111
	112	return len;
	113	}
	114
	115	static ssize_t lp55xx_show_max_current(struct device *dev,
	116	struct device_attribute *attr,
	117	char *buf)
	118	{
	119	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
	120
24d32128	121	return scnprintf(buf, PAGE_SIZE, "%d\n", led->max_current);
a96bfa13 MWK	122	}
	123
	124	static DEVICE_ATTR(led_current, S_IRUGO \| S_IWUSR, lp55xx_show_current,
	125	lp55xx_store_current);
	126	static DEVICE_ATTR(max_current, S_IRUGO , lp55xx_show_max_current, NULL);
	127
0e202346	128	static struct attribute *lp55xx_led_attributes[] = {
a96bfa13 MWK	129	&dev_attr_led_current.attr,
a96bfa13 MWK	130	&dev_attr_max_current.attr,
0e202346 MWK	131	NULL,
	132	};
	133
	134	static struct attribute_group lp55xx_led_attr_group = {
	135	.attrs = lp55xx_led_attributes
	136	};
	137
	138	static void lp55xx_set_brightness(struct led_classdev *cdev,
	139	enum led_brightness brightness)
	140	{
a6e4679a MWK	141	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
	142
	143	led->brightness = (u8)brightness;
	144	schedule_work(&led->brightness_work);
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;
	168
	169	if (led->chan_nr >= max_channel) {
	170	dev_err(dev, "Use channel numbers between 0 and %d\n",
	171	max_channel - 1);
	172	return -EINVAL;
	173	}
	174
	175	led->cdev.brightness_set = lp55xx_set_brightness;
	176
	177	if (pdata->led_config[chan].name) {
	178	led->cdev.name = pdata->led_config[chan].name;
	179	} else {
	180	snprintf(name, sizeof(name), "%s:channel%d",
	181	pdata->label ? : chip->cl->name, chan);
	182	led->cdev.name = name;
	183	}
	184
	185	/*
	186	* register led class device for each channel and
	187	* add device attributes
	188	*/
	189
	190	ret = led_classdev_register(dev, &led->cdev);
	191	if (ret) {
	192	dev_err(dev, "led register err: %d\n", ret);
	193	return ret;
	194	}
	195
	196	ret = sysfs_create_group(&led->cdev.dev->kobj, &lp55xx_led_attr_group);
	197	if (ret) {
	198	dev_err(dev, "led sysfs err: %d\n", ret);
	199	led_classdev_unregister(&led->cdev);
	200	return ret;
	201	}
	202
9e9b3db1 MWK	203	return 0;
	204	}
	205
10c06d17 MWK	206	static void lp55xx_firmware_loaded(const struct firmware fw, void context)
	207	{
	208	struct lp55xx_chip *chip = context;
	209	struct device *dev = &chip->cl->dev;
	210
	211	if (!fw) {
	212	dev_err(dev, "firmware request failed\n");
	213	goto out;
	214	}
	215
	216	/* handling firmware data is chip dependent */
	217	mutex_lock(&chip->lock);
	218
	219	chip->fw = fw;
	220	if (chip->cfg->firmware_cb)
	221	chip->cfg->firmware_cb(chip);
	222
	223	mutex_unlock(&chip->lock);
	224
	225	out:
	226	/* firmware should be released for other channel use */
	227	release_firmware(chip->fw);
	228	}
	229
	230	static int lp55xx_request_firmware(struct lp55xx_chip *chip)
	231	{
	232	const char *name = chip->cl->name;
	233	struct device *dev = &chip->cl->dev;
	234
	235	return request_firmware_nowait(THIS_MODULE, true, name, dev,
	236	GFP_KERNEL, chip, lp55xx_firmware_loaded);
	237	}
	238
	239	static ssize_t lp55xx_show_engine_select(struct device *dev,
	240	struct device_attribute *attr,
	241	char *buf)
	242	{
	243	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	244	struct lp55xx_chip *chip = led->chip;
	245
	246	return sprintf(buf, "%d\n", chip->engine_idx);
	247	}
	248
	249	static ssize_t lp55xx_store_engine_select(struct device *dev,
	250	struct device_attribute *attr,
	251	const char *buf, size_t len)
	252	{
	253	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	254	struct lp55xx_chip *chip = led->chip;
	255	unsigned long val;
	256	int ret;
	257
	258	if (kstrtoul(buf, 0, &val))
	259	return -EINVAL;
	260
	261	/* select the engine to be run */
	262
	263	switch (val) {
	264	case LP55XX_ENGINE_1:
	265	case LP55XX_ENGINE_2:
	266	case LP55XX_ENGINE_3:
	267	mutex_lock(&chip->lock);
	268	chip->engine_idx = val;
	269	ret = lp55xx_request_firmware(chip);
270	mutex_unlock(&chip->lock);
271	break;
272	default:
273	dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val);
274	return -EINVAL;
275	}
276
277	if (ret) {
278	dev_err(dev, "request firmware err: %d\n", ret);
279	return ret;
280	}
281
282	return len;
283	}
284
285	static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start)
286	{
287	if (chip->cfg->run_engine)
288	chip->cfg->run_engine(chip, start);
289	}
290
291	static ssize_t lp55xx_store_engine_run(struct device *dev,
292	struct device_attribute *attr,
293	const char *buf, size_t len)
294	{
295	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
296	struct lp55xx_chip *chip = led->chip;
297	unsigned long val;
298
299	if (kstrtoul(buf, 0, &val))
300	return -EINVAL;
301
302	/* run or stop the selected engine */
303
304	if (val <= 0) {
305	lp55xx_run_engine(chip, false);
306	return len;
307	}
308
309	mutex_lock(&chip->lock);
310	lp55xx_run_engine(chip, true);
311	mutex_unlock(&chip->lock);
312
313	return len;
314	}
315
316	static DEVICE_ATTR(select_engine, S_IRUGO \| S_IWUSR,
317	lp55xx_show_engine_select, lp55xx_store_engine_select);
318	static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run);
319
b3b6f811	320	static struct attribute *lp55xx_engine_attributes[] = {
10c06d17 MWK	321	&dev_attr_select_engine.attr,
10c06d17 MWK	322	&dev_attr_run_engine.attr,
b3b6f811 MWK	323	NULL,
	324	};
	325
	326	static const struct attribute_group lp55xx_engine_attr_group = {
	327	.attrs = lp55xx_engine_attributes,
	328	};
	329
c93d08fa MWK	330	int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
	331	{
	332	return i2c_smbus_write_byte_data(chip->cl, reg, val);
	333	}
	334	EXPORT_SYMBOL_GPL(lp55xx_write);
	335
	336	int lp55xx_read(struct lp55xx_chip chip, u8 reg, u8 val)
	337	{
	338	s32 ret;
	339
	340	ret = i2c_smbus_read_byte_data(chip->cl, reg);
	341	if (ret < 0)
	342	return ret;
	343
	344	*val = ret;
	345	return 0;
	346	}
	347	EXPORT_SYMBOL_GPL(lp55xx_read);
	348
	349	int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
	350	{
	351	int ret;
	352	u8 tmp;
	353
	354	ret = lp55xx_read(chip, reg, &tmp);
	355	if (ret)
	356	return ret;
	357
	358	tmp &= ~mask;
	359	tmp \|= val & mask;
	360
	361	return lp55xx_write(chip, reg, tmp);
	362	}
	363	EXPORT_SYMBOL_GPL(lp55xx_update_bits);
	364
53b41922 KM	365	bool lp55xx_is_extclk_used(struct lp55xx_chip *chip)
	366	{
	367	struct clk *clk;
	368	int err;
	369
	370	clk = devm_clk_get(&chip->cl->dev, "32k_clk");
	371	if (IS_ERR(clk))
	372	goto use_internal_clk;
	373
	374	err = clk_prepare_enable(clk);
	375	if (err)
	376	goto use_internal_clk;
	377
	378	if (clk_get_rate(clk) != LP55XX_CLK_32K) {
	379	clk_disable_unprepare(clk);
	380	goto use_internal_clk;
	381	}
	382
	383	dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K);
	384
	385	chip->clk = clk;
	386	return true;
	387
	388	use_internal_clk:
	389	dev_info(&chip->cl->dev, "internal clock used\n");
	390	return false;
	391	}
	392	EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used);
	393
a85908dd MWK	394	int lp55xx_init_device(struct lp55xx_chip *chip)
	395	{
	396	struct lp55xx_platform_data *pdata;
48068d5d	397	struct lp55xx_device_config *cfg;
a85908dd MWK	398	struct device *dev = &chip->cl->dev;
	399	int ret = 0;
	400
	401	WARN_ON(!chip);
	402
	403	pdata = chip->pdata;
48068d5d	404	cfg = chip->cfg;
a85908dd	405
48068d5d	406	if (!pdata \|\| !cfg)
a85908dd MWK	407	return -EINVAL;
	408
	409	if (pdata->setup_resources) {
	410	ret = pdata->setup_resources();
	411	if (ret < 0) {
	412	dev_err(dev, "setup resoure err: %d\n", ret);
	413	goto err;
	414	}
	415	}
	416
	417	if (pdata->enable) {
	418	pdata->enable(0);
	419	usleep_range(1000, 2000); /* Keep enable down at least 1ms */
	420	pdata->enable(1);
	421	usleep_range(1000, 2000); /* 500us abs min. */
	422	}
	423
48068d5d MWK	424	lp55xx_reset_device(chip);
	425
	426	/*
	427	* Exact value is not available. 10 - 20ms
	428	* appears to be enough for reset.
	429	*/
	430	usleep_range(10000, 20000);
	431
e3a700d8 MWK	432	ret = lp55xx_detect_device(chip);
	433	if (ret) {
	434	dev_err(dev, "device detection err: %d\n", ret);
	435	goto err;
	436	}
	437
ffbdccdb MWK	438	/* chip specific initialization */
ffbdccdb MWK	439	ret = lp55xx_post_init_device(chip);
22ebeb48 MWK	440	if (ret) {
	441	dev_err(dev, "post init device err: %d\n", ret);
	442	goto err_post_init;
	443	}
ffbdccdb MWK	444
	445	return 0;
	446
22ebeb48	447	err_post_init:
6ce61762 MWK	448	lp55xx_deinit_device(chip);
	449	err:
	450	return ret;
	451	}
	452	EXPORT_SYMBOL_GPL(lp55xx_init_device);
	453
	454	void lp55xx_deinit_device(struct lp55xx_chip *chip)
	455	{
	456	struct lp55xx_platform_data *pdata = chip->pdata;
	457
53b41922 KM	458	if (chip->clk)
	459	clk_disable_unprepare(chip->clk);
	460
22ebeb48 MWK	461	if (pdata->enable)
22ebeb48 MWK	462	pdata->enable(0);
6ce61762	463
22ebeb48 MWK	464	if (pdata->release_resources)
22ebeb48 MWK	465	pdata->release_resources();
a85908dd	466	}
6ce61762	467	EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
a85908dd	468
9e9b3db1 MWK	469	int lp55xx_register_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	470	{
	471	struct lp55xx_platform_data *pdata = chip->pdata;
	472	struct lp55xx_device_config *cfg = chip->cfg;
	473	int num_channels = pdata->num_channels;
	474	struct lp55xx_led *each;
	475	u8 led_current;
	476	int ret;
	477	int i;
	478
	479	if (!cfg->brightness_work_fn) {
	480	dev_err(&chip->cl->dev, "empty brightness configuration\n");
	481	return -EINVAL;
	482	}
	483
	484	for (i = 0; i < num_channels; i++) {
	485
	486	/* do not initialize channels that are not connected */
	487	if (pdata->led_config[i].led_current == 0)
	488	continue;
	489
	490	led_current = pdata->led_config[i].led_current;
	491	each = led + i;
	492	ret = lp55xx_init_led(each, chip, i);
	493	if (ret)
	494	goto err_init_led;
	495
	496	INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);
	497
	498	chip->num_leds++;
	499	each->chip = chip;
	500
	501	/* setting led current at each channel */
	502	if (cfg->set_led_current)
	503	cfg->set_led_current(each, led_current);
	504	}
	505
	506	return 0;
	507
	508	err_init_led:
d9067d28	509	lp55xx_unregister_leds(led, chip);
9e9b3db1 MWK	510	return ret;
	511	}
	512	EXPORT_SYMBOL_GPL(lp55xx_register_leds);
	513
c3a68ebf MWK	514	void lp55xx_unregister_leds(struct lp55xx_led led, struct lp55xx_chip chip)
	515	{
	516	int i;
	517	struct lp55xx_led *each;
c3a68ebf MWK	518
	519	for (i = 0; i < chip->num_leds; i++) {
	520	each = led + i;
c3a68ebf MWK	521	led_classdev_unregister(&each->cdev);
	522	flush_work(&each->brightness_work);
	523	}
	524	}
	525	EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);
	526
b3b6f811 MWK	527	int lp55xx_register_sysfs(struct lp55xx_chip *chip)
	528	{
	529	struct device *dev = &chip->cl->dev;
240085e2 MWK	530	struct lp55xx_device_config *cfg = chip->cfg;
	531	int ret;
	532
	533	if (!cfg->run_engine \|\| !cfg->firmware_cb)
	534	goto dev_specific_attrs;
	535
	536	ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
	537	if (ret)
	538	return ret;
b3b6f811	539
240085e2 MWK	540	dev_specific_attrs:
	541	return cfg->dev_attr_group ?
	542	sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
b3b6f811 MWK	543	}
	544	EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
	545
ba6fa846 MWK	546	void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
	547	{
	548	struct device *dev = &chip->cl->dev;
	549	struct lp55xx_device_config *cfg = chip->cfg;
	550
	551	if (cfg->dev_attr_group)
	552	sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);
	553
	554	sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
	555	}
	556	EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
	557
7542a04b LW	558	int lp55xx_of_populate_pdata(struct device dev, struct device_node np)
	559	{
	560	struct lp55xx_platform_data *pdata;
	561	u8 led_cur[3];
	562	u8 max_cur[3];
	563	u8 clock_mode;
	564	u8 num_channel;
	565	const char *label;
	566	struct lp55xx_led_config *led_config;
	567	int ret;
	568	int i;
	569
	570	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	571	if (!pdata)
	572	return -ENOMEM;
	573
	574	ret = of_property_read_u8(np, "num-channel", &num_channel);
	575	if (ret < 0)
	576	return ret;
	577	ret = of_property_read_u8_array(np, "led-cur", led_cur, num_channel);
	578	if (ret < 0)
	579	return ret;
	580	ret = of_property_read_u8_array(np, "max-cur", max_cur, num_channel);
	581	if (ret < 0)
	582	return ret;
	583	ret = of_property_read_string(np, "label", &label);
	584	if (ret < 0)
	585	return ret;
	586	ret = of_property_read_u8_array(np, "clock-mode", &clock_mode, 1);
	587	if (ret < 0)
	588	return ret;
	589
	590	led_config = devm_kzalloc(dev, sizeof(led_config) num_channel,
	591	GFP_KERNEL);
	592	if (!led_config)
	593	return -ENOMEM;
	594
	595	for (i = 0; i < num_channel; i++) {
	596	led_config[i].chan_nr = i;
	597	led_config[i].led_current = led_cur[i];
	598	led_config[i].max_current = max_cur[i];
	599	}
	600	pdata->label = kzalloc(sizeof(char) * 32, GFP_KERNEL);
	601	strcpy((char )pdata->label, (char ) label);
	602	pdata->led_config = &led_config[0];
	603	pdata->num_channels = num_channel;
	604	pdata->clock_mode = clock_mode;
	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");