Release 4.10 drivers/leds/leds-lp55xx-common.c

Directory: drivers/leds
/*
 * 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);
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 102 100.00% 1 100.00%
Total 102 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 44 100.00% 2 100.00%
Total 44 100.00% 2 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 120 100.00% 1 100.00%
Total 120 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 44 100.00% 2 100.00%
Total 44 100.00% 2 100.00%

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);
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 36 67.92% 2 66.67%
andrew lunn andrew lunn 17 32.08% 1 33.33%
Total 53 100.00% 3 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 272 91.89% 2 40.00%
linus walleij linus walleij 15 5.07% 1 20.00%
johan hovold johan hovold 8 2.70% 1 20.00%
andrew lunn andrew lunn 1 0.34% 1 20.00%
Total 296 100.00% 5 100.00%



static void lp55xx_firmware_loaded(const struct firmware *fw, void *context)
{
	struct lp55xx_chip *chip = context;
	struct device *dev = &chip->cl->dev;
	enum lp55xx_engine_index idx = chip->engine_idx;

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

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

	chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD;
	chip->fw = fw;
	if (chip->cfg->firmware_cb)
		chip->cfg->firmware_cb(chip);

	mutex_unlock(&chip->lock);

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

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 123 100.00% 2 100.00%
Total 123 100.00% 2 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 52 100.00% 2 100.00%
Total 52 100.00% 2 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 54 100.00% 1 100.00%
Total 54 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 150 100.00% 1 100.00%
Total 150 100.00% 1 100.00%



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

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 34 100.00% 1 100.00%
Total 34 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 111 100.00% 1 100.00%
Total 111 100.00% 1 100.00%

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);
}
Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%


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;
}
Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%


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);
}
Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 65 100.00% 1 100.00%
Total 65 100.00% 1 100.00%


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;
}
Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 115 100.00% 1 100.00%
Total 115 100.00% 1 100.00%


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;
}
Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 203 89.82% 6 85.71%
sebastian reichel sebastian reichel 23 10.18% 1 14.29%
Total 226 100.00% 7 100.00%


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);
}
Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 42 84.00% 4 80.00%
sebastian reichel sebastian reichel 8 16.00% 1 20.00%
Total 50 100.00% 5 100.00%


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;
}
Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 185 99.46% 2 66.67%
andrew lunn andrew lunn 1 0.54% 1 33.33%
Total 186 100.00% 3 100.00%


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);
	}
}
Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 54 100.00% 1 100.00%
Total 54 100.00% 1 100.00%


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;
}
Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 90 100.00% 2 100.00%
Total 90 100.00% 2 100.00%


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);
}
Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 60 100.00% 1 100.00%
Total 60 100.00% 1 100.00%


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;
}
Contributors
Person Tokens Prop Commits CommitProp
linus walleij linus walleij 146 52.33% 2 33.33%
kim milo kim milo 120 43.01% 3 50.00%
sebastian reichel sebastian reichel 13 4.66% 1 16.67%
Total 279 100.00% 6 100.00%


EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata);

MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
MODULE_DESCRIPTION("LP55xx Common Driver");
MODULE_LICENSE("GPL");
Overall Contributors
Person Tokens Prop Commits CommitProp
kim milo kim milo 2485 90.79% 25 83.33%
linus walleij linus walleij 169 6.17% 2 6.67%
sebastian reichel sebastian reichel 50 1.83% 1 3.33%
andrew lunn andrew lunn 19 0.69% 1 3.33%
johan hovold johan hovold 14 0.51% 1 3.33%
Total 2737 100.00% 30 100.00%
Directory: drivers/leds

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
kim milo	kim milo	24	100.00%	1	100.00%
	Total	24	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 drivers/leds/leds-lp55xx-common.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
