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Release 4.14 drivers/leds/leds-lm3642.c

Directory: drivers/leds
/*
* Simple driver for Texas Instruments LM3642 LED Flash driver chip
* Copyright (C) 2012 Texas Instruments
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/fs.h>
#include <linux/regmap.h>
#include <linux/platform_data/leds-lm3642.h>


#define	REG_FILT_TIME			(0x0)

#define	REG_IVFM_MODE			(0x1)

#define	REG_TORCH_TIME			(0x6)

#define	REG_FLASH			(0x8)

#define	REG_I_CTRL			(0x9)

#define	REG_ENABLE			(0xA)

#define	REG_FLAG			(0xB)

#define	REG_MAX				(0xB)


#define	UVLO_EN_SHIFT			(7)

#define	IVM_D_TH_SHIFT			(2)

#define	TORCH_RAMP_UP_TIME_SHIFT	(3)

#define	TORCH_RAMP_DN_TIME_SHIFT	(0)

#define	INDUCTOR_I_LIMIT_SHIFT		(6)

#define	FLASH_RAMP_TIME_SHIFT		(3)

#define	FLASH_TOUT_TIME_SHIFT		(0)

#define	TORCH_I_SHIFT			(4)

#define	FLASH_I_SHIFT			(0)

#define	IVFM_SHIFT			(7)

#define	TX_PIN_EN_SHIFT			(6)

#define	STROBE_PIN_EN_SHIFT		(5)

#define	TORCH_PIN_EN_SHIFT		(4)

#define	MODE_BITS_SHIFT			(0)


#define	UVLO_EN_MASK			(0x1)

#define	IVM_D_TH_MASK			(0x7)

#define	TORCH_RAMP_UP_TIME_MASK		(0x7)

#define	TORCH_RAMP_DN_TIME_MASK		(0x7)

#define	INDUCTOR_I_LIMIT_MASK		(0x1)

#define	FLASH_RAMP_TIME_MASK		(0x7)

#define	FLASH_TOUT_TIME_MASK		(0x7)

#define	TORCH_I_MASK			(0x7)

#define	FLASH_I_MASK			(0xF)

#define	IVFM_MASK			(0x1)

#define	TX_PIN_EN_MASK			(0x1)

#define	STROBE_PIN_EN_MASK		(0x1)

#define	TORCH_PIN_EN_MASK		(0x1)

#define	MODE_BITS_MASK			(0x73)

#define EX_PIN_CONTROL_MASK		(0x71)

#define EX_PIN_ENABLE_MASK		(0x70)


enum lm3642_mode {
	
MODES_STASNDBY = 0,
	
MODES_INDIC,
	
MODES_TORCH,
	
MODES_FLASH
};


struct lm3642_chip_data {
	
struct device *dev;

	
struct led_classdev cdev_flash;
	
struct led_classdev cdev_torch;
	
struct led_classdev cdev_indicator;

	
u8 br_flash;
	
u8 br_torch;
	
u8 br_indicator;

	
enum lm3642_torch_pin_enable torch_pin;
	
enum lm3642_strobe_pin_enable strobe_pin;
	
enum lm3642_tx_pin_enable tx_pin;

	
struct lm3642_platform_data *pdata;
	
struct regmap *regmap;
	
struct mutex lock;

	
unsigned int last_flag;
};

/* chip initialize */

static int lm3642_chip_init(struct lm3642_chip_data *chip) { int ret; struct lm3642_platform_data *pdata = chip->pdata; /* set enable register */ ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK, pdata->tx_pin); if (ret < 0) dev_err(chip->dev, "Failed to update REG_ENABLE Register\n"); return ret; }

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Axel Lin35.08%150.00%
Total59100.00%2100.00%

/* chip control */
static int lm3642_control(struct lm3642_chip_data *chip, u8 brightness, enum lm3642_mode opmode) { int ret; ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag); if (ret < 0) { dev_err(chip->dev, "Failed to read REG_FLAG Register\n"); goto out; } if (chip->last_flag) dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag); /* brightness 0 means off-state */ if (!brightness) opmode = MODES_STASNDBY; switch (opmode) { case MODES_TORCH: ret = regmap_update_bits(chip->regmap, REG_I_CTRL, TORCH_I_MASK << TORCH_I_SHIFT, (brightness - 1) << TORCH_I_SHIFT); if (chip->torch_pin) opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT); break; case MODES_FLASH: ret = regmap_update_bits(chip->regmap, REG_I_CTRL, FLASH_I_MASK << FLASH_I_SHIFT, (brightness - 1) << FLASH_I_SHIFT); if (chip->strobe_pin) opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT); break; case MODES_INDIC: ret = regmap_update_bits(chip->regmap, REG_I_CTRL, TORCH_I_MASK << TORCH_I_SHIFT, (brightness - 1) << TORCH_I_SHIFT); break; case MODES_STASNDBY: break; default: return ret; } if (ret < 0) { dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n"); goto out; } if (chip->tx_pin) opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT); ret = regmap_update_bits(chip->regmap, REG_ENABLE, MODE_BITS_MASK << MODE_BITS_SHIFT, opmode << MODE_BITS_SHIFT); out: return ret; }

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Daniel Jeong267100.00%1100.00%
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/* torch */ /* torch pin config for lm3642*/
static ssize_t lm3642_torch_pin_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { ssize_t ret; struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3642_chip_data *chip = container_of(led_cdev, struct lm3642_chip_data, cdev_indicator); unsigned int state; ret = kstrtouint(buf, 10, &state); if (ret) goto out_strtoint; if (state != 0) state = 0x01 << TORCH_PIN_EN_SHIFT; chip->torch_pin = state; ret = regmap_update_bits(chip->regmap, REG_ENABLE, TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT, state); if (ret < 0) goto out; return size; out: dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); return ret; out_strtoint: dev_err(chip->dev, "%s: fail to change str to int\n", __func__); return ret; }

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Total154100.00%3100.00%

static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);
static int lm3642_torch_brightness_set(struct led_classdev *cdev, enum led_brightness brightness) { struct lm3642_chip_data *chip = container_of(cdev, struct lm3642_chip_data, cdev_torch); int ret; mutex_lock(&chip->lock); chip->br_torch = brightness; ret = lm3642_control(chip, chip->br_torch, MODES_TORCH); mutex_unlock(&chip->lock); return ret; }

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Daniel Jeong4766.20%150.00%
Andrew Lunn2433.80%150.00%
Total71100.00%2100.00%

/* flash */ /* strobe pin config for lm3642*/
static ssize_t lm3642_strobe_pin_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { ssize_t ret; struct led_classdev *led_cdev = dev_get_drvdata(dev); struct lm3642_chip_data *chip = container_of(led_cdev, struct lm3642_chip_data, cdev_indicator); unsigned int state; ret = kstrtouint(buf, 10, &state); if (ret) goto out_strtoint; if (state != 0) state = 0x01 << STROBE_PIN_EN_SHIFT; chip->strobe_pin = state; ret = regmap_update_bits(chip->regmap, REG_ENABLE, STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT, state); if (ret < 0) goto out; return size; out: dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); return ret; out_strtoint: dev_err(chip->dev, "%s: fail to change str to int\n", __func__); return ret; }

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Daniel Jeong15198.05%133.33%
Axel Lin21.30%133.33%
Jingoo Han10.65%133.33%
Total154100.00%3100.00%

static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);
static int lm3642_strobe_brightness_set(struct led_classdev *cdev, enum led_brightness brightness) { struct lm3642_chip_data *chip = container_of(cdev, struct lm3642_chip_data, cdev_flash); int ret; mutex_lock(&chip->lock); chip->br_flash = brightness; ret = lm3642_control(chip, chip->br_flash, MODES_FLASH); mutex_unlock(&chip->lock); return ret; }

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Daniel Jeong4766.20%150.00%
Andrew Lunn2433.80%150.00%
Total71100.00%2100.00%

/* indicator */
static int lm3642_indicator_brightness_set(struct led_classdev *cdev, enum led_brightness brightness) { struct lm3642_chip_data *chip = container_of(cdev, struct lm3642_chip_data, cdev_indicator); int ret; mutex_lock(&chip->lock); chip->br_indicator = brightness; ret = lm3642_control(chip, chip->br_indicator, MODES_INDIC); mutex_unlock(&chip->lock); return ret; }

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Daniel Jeong5577.46%150.00%
Andrew Lunn1622.54%150.00%
Total71100.00%2100.00%

static const struct regmap_config lm3642_regmap = { .reg_bits = 8, .val_bits = 8, .max_register = REG_MAX, }; static struct attribute *lm3642_flash_attrs[] = { &dev_attr_strobe_pin.attr, NULL }; ATTRIBUTE_GROUPS(lm3642_flash); static struct attribute *lm3642_torch_attrs[] = { &dev_attr_torch_pin.attr, NULL }; ATTRIBUTE_GROUPS(lm3642_torch);
static int lm3642_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev); struct lm3642_chip_data *chip; int err; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(&client->dev, "i2c functionality check fail.\n"); return -EOPNOTSUPP; } if (pdata == NULL) { dev_err(&client->dev, "needs Platform Data.\n"); return -ENODATA; } chip = devm_kzalloc(&client->dev, sizeof(struct lm3642_chip_data), GFP_KERNEL); if (!chip) return -ENOMEM; chip->dev = &client->dev; chip->pdata = pdata; chip->tx_pin = pdata->tx_pin; chip->torch_pin = pdata->torch_pin; chip->strobe_pin = pdata->strobe_pin; chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap); if (IS_ERR(chip->regmap)) { err = PTR_ERR(chip->regmap); dev_err(&client->dev, "Failed to allocate register map: %d\n", err); return err; } mutex_init(&chip->lock); i2c_set_clientdata(client, chip); err = lm3642_chip_init(chip); if (err < 0) goto err_out; /* flash */ chip->cdev_flash.name = "flash"; chip->cdev_flash.max_brightness = 16; chip->cdev_flash.brightness_set_blocking = lm3642_strobe_brightness_set; chip->cdev_flash.default_trigger = "flash"; chip->cdev_flash.groups = lm3642_flash_groups, err = led_classdev_register((struct device *) &client->dev, &chip->cdev_flash); if (err < 0) { dev_err(chip->dev, "failed to register flash\n"); goto err_out; } /* torch */ chip->cdev_torch.name = "torch"; chip->cdev_torch.max_brightness = 8; chip->cdev_torch.brightness_set_blocking = lm3642_torch_brightness_set; chip->cdev_torch.default_trigger = "torch"; chip->cdev_torch.groups = lm3642_torch_groups, err = led_classdev_register((struct device *) &client->dev, &chip->cdev_torch); if (err < 0) { dev_err(chip->dev, "failed to register torch\n"); goto err_create_torch_file; } /* indicator */ chip->cdev_indicator.name = "indicator"; chip->cdev_indicator.max_brightness = 8; chip->cdev_indicator.brightness_set_blocking = lm3642_indicator_brightness_set; err = led_classdev_register((struct device *) &client->dev, &chip->cdev_indicator); if (err < 0) { dev_err(chip->dev, "failed to register indicator\n"); goto err_create_indicator_file; } dev_info(&client->dev, "LM3642 is initialized\n"); return 0; err_create_indicator_file: led_classdev_unregister(&chip->cdev_torch); err_create_torch_file: led_classdev_unregister(&chip->cdev_flash); err_out: return err; }

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Daniel Jeong45892.15%120.00%
Johan Hovold163.22%120.00%
Kim (Woogyom) Milo163.22%120.00%
Jingoo Han40.80%120.00%
Andrew Lunn30.60%120.00%
Total497100.00%5100.00%


static int lm3642_remove(struct i2c_client *client) { struct lm3642_chip_data *chip = i2c_get_clientdata(client); led_classdev_unregister(&chip->cdev_indicator); led_classdev_unregister(&chip->cdev_torch); led_classdev_unregister(&chip->cdev_flash); regmap_write(chip->regmap, REG_ENABLE, 0); return 0; }

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Daniel Jeong59100.00%1100.00%
Total59100.00%1100.00%

static const struct i2c_device_id lm3642_id[] = { {LM3642_NAME, 0}, {} }; MODULE_DEVICE_TABLE(i2c, lm3642_id); static struct i2c_driver lm3642_i2c_driver = { .driver = { .name = LM3642_NAME, .pm = NULL, }, .probe = lm3642_probe, .remove = lm3642_remove, .id_table = lm3642_id, }; module_i2c_driver(lm3642_i2c_driver); MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642"); MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); MODULE_LICENSE("GPL v2");

Overall Contributors

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Daniel Jeong168391.47%111.11%
Andrew Lunn683.70%111.11%
Johan Hovold583.15%111.11%
Kim (Woogyom) Milo160.87%111.11%
Axel Lin90.49%333.33%
Jingoo Han60.33%222.22%
Total1840100.00%9100.00%
Directory: drivers/leds
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