diff options
Diffstat (limited to 'drivers/leds/leds-lm355x.c')
-rw-r--r-- | drivers/leds/leds-lm355x.c | 572 |
1 files changed, 572 insertions, 0 deletions
diff --git a/drivers/leds/leds-lm355x.c b/drivers/leds/leds-lm355x.c new file mode 100644 index 00000000000..065ec015d67 --- /dev/null +++ b/drivers/leds/leds-lm355x.c @@ -0,0 +1,572 @@ +/* +* Simple driver for Texas Instruments LM355x 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/gpio.h> +#include <linux/leds.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/fs.h> +#include <linux/regmap.h> +#include <linux/workqueue.h> +#include <linux/platform_data/leds-lm355x.h> + +enum lm355x_type { + CHIP_LM3554 = 0, + CHIP_LM3556, +}; + +enum lm355x_regs { + REG_FLAG = 0, + REG_TORCH_CFG, + REG_TORCH_CTRL, + REG_STROBE_CFG, + REG_FLASH_CTRL, + REG_INDI_CFG, + REG_INDI_CTRL, + REG_OPMODE, + REG_MAX, +}; + +/* operation mode */ +enum lm355x_mode { + MODE_SHDN = 0, + MODE_INDIC, + MODE_TORCH, + MODE_FLASH +}; + +/* register map info. */ +struct lm355x_reg_data { + u8 regno; + u8 mask; + u8 shift; +}; + +struct lm355x_chip_data { + struct device *dev; + enum lm355x_type type; + + struct led_classdev cdev_flash; + struct led_classdev cdev_torch; + struct led_classdev cdev_indicator; + + struct work_struct work_flash; + struct work_struct work_torch; + struct work_struct work_indicator; + + u8 br_flash; + u8 br_torch; + u8 br_indicator; + + struct lm355x_platform_data *pdata; + struct regmap *regmap; + struct mutex lock; + + unsigned int last_flag; + struct lm355x_reg_data *regs; +}; + +/* specific indicator function for lm3556 */ +enum lm3556_indic_pulse_time { + PULSE_TIME_0_MS = 0, + PULSE_TIME_32_MS, + PULSE_TIME_64_MS, + PULSE_TIME_92_MS, + PULSE_TIME_128_MS, + PULSE_TIME_160_MS, + PULSE_TIME_196_MS, + PULSE_TIME_224_MS, + PULSE_TIME_256_MS, + PULSE_TIME_288_MS, + PULSE_TIME_320_MS, + PULSE_TIME_352_MS, + PULSE_TIME_384_MS, + PULSE_TIME_416_MS, + PULSE_TIME_448_MS, + PULSE_TIME_480_MS, +}; + +enum lm3556_indic_n_blank { + INDIC_N_BLANK_0 = 0, + INDIC_N_BLANK_1, + INDIC_N_BLANK_2, + INDIC_N_BLANK_3, + INDIC_N_BLANK_4, + INDIC_N_BLANK_5, + INDIC_N_BLANK_6, + INDIC_N_BLANK_7, + INDIC_N_BLANK_8, + INDIC_N_BLANK_9, + INDIC_N_BLANK_10, + INDIC_N_BLANK_11, + INDIC_N_BLANK_12, + INDIC_N_BLANK_13, + INDIC_N_BLANK_14, + INDIC_N_BLANK_15, +}; + +enum lm3556_indic_period { + INDIC_PERIOD_0 = 0, + INDIC_PERIOD_1, + INDIC_PERIOD_2, + INDIC_PERIOD_3, + INDIC_PERIOD_4, + INDIC_PERIOD_5, + INDIC_PERIOD_6, + INDIC_PERIOD_7, +}; + +#define INDIC_PATTERN_SIZE 4 + +struct indicator { + u8 blinking; + u8 period_cnt; +}; + +/* indicator pattern data only for lm3556 */ +static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = { + [0] = {(INDIC_N_BLANK_1 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_1}, + [1] = {(INDIC_N_BLANK_15 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_2}, + [2] = {(INDIC_N_BLANK_10 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_4}, + [3] = {(INDIC_N_BLANK_5 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_7}, +}; + +static struct lm355x_reg_data lm3554_regs[REG_MAX] = { + [REG_FLAG] = {0xD0, 0xBF, 0}, + [REG_TORCH_CFG] = {0xE0, 0x80, 7}, + [REG_TORCH_CTRL] = {0xA0, 0x38, 3}, + [REG_STROBE_CFG] = {0xE0, 0x04, 2}, + [REG_FLASH_CTRL] = {0xB0, 0x78, 3}, + [REG_INDI_CFG] = {0xE0, 0x08, 3}, + [REG_INDI_CTRL] = {0xA0, 0xC0, 6}, + [REG_OPMODE] = {0xA0, 0x03, 0}, +}; + +static struct lm355x_reg_data lm3556_regs[REG_MAX] = { + [REG_FLAG] = {0x0B, 0xFF, 0}, + [REG_TORCH_CFG] = {0x0A, 0x10, 4}, + [REG_TORCH_CTRL] = {0x09, 0x70, 4}, + [REG_STROBE_CFG] = {0x0A, 0x20, 5}, + [REG_FLASH_CTRL] = {0x09, 0x0F, 0}, + [REG_INDI_CFG] = {0xFF, 0xFF, 0}, + [REG_INDI_CTRL] = {0x09, 0x70, 4}, + [REG_OPMODE] = {0x0A, 0x03, 0}, +}; + +static char lm355x_name[][I2C_NAME_SIZE] = { + [CHIP_LM3554] = LM3554_NAME, + [CHIP_LM3556] = LM3556_NAME, +}; + +/* chip initialize */ +static int __devinit lm355x_chip_init(struct lm355x_chip_data *chip) +{ + int ret; + unsigned int reg_val; + struct lm355x_platform_data *pdata = chip->pdata; + + /* input and output pins configuration */ + switch (chip->type) { + case CHIP_LM3554: + reg_val = pdata->pin_tx2 | pdata->ntc_pin; + ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val); + if (ret < 0) + goto out; + reg_val = pdata->pass_mode; + ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val); + if (ret < 0) + goto out; + break; + + case CHIP_LM3556: + reg_val = pdata->pin_tx2 | pdata->ntc_pin | pdata->pass_mode; + ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val); + if (ret < 0) + goto out; + break; + default: + return -ENODATA; + } + + return ret; +out: + dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); + return ret; +} + +/* chip control */ +static void lm355x_control(struct lm355x_chip_data *chip, + u8 brightness, enum lm355x_mode opmode) +{ + int ret; + unsigned int reg_val; + struct lm355x_platform_data *pdata = chip->pdata; + struct lm355x_reg_data *preg = chip->regs; + + ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag); + if (ret < 0) + goto out; + if (chip->last_flag & preg[REG_FLAG].mask) + dev_info(chip->dev, "%s Last FLAG is 0x%x\n", + lm355x_name[chip->type], + chip->last_flag & preg[REG_FLAG].mask); + /* brightness 0 means shutdown */ + if (!brightness) + opmode = MODE_SHDN; + + switch (opmode) { + case MODE_TORCH: + ret = + regmap_update_bits(chip->regmap, preg[REG_TORCH_CTRL].regno, + preg[REG_TORCH_CTRL].mask, + (brightness - 1) + << preg[REG_TORCH_CTRL].shift); + if (ret < 0) + goto out; + + if (pdata->pin_tx1 != LM355x_PIN_TORCH_DISABLE) { + ret = + regmap_update_bits(chip->regmap, + preg[REG_TORCH_CFG].regno, + preg[REG_TORCH_CFG].mask, + 0x01 << + preg[REG_TORCH_CFG].shift); + if (ret < 0) + goto out; + opmode = MODE_SHDN; + dev_info(chip->dev, + "torch brt is set - ext. torch pin mode\n"); + } + break; + + case MODE_FLASH: + + ret = + regmap_update_bits(chip->regmap, preg[REG_FLASH_CTRL].regno, + preg[REG_FLASH_CTRL].mask, + (brightness - 1) + << preg[REG_FLASH_CTRL].shift); + if (ret < 0) + goto out; + + if (pdata->pin_strobe != LM355x_PIN_STROBE_DISABLE) { + if (chip->type == CHIP_LM3554) + reg_val = 0x00; + else + reg_val = 0x01; + ret = + regmap_update_bits(chip->regmap, + preg[REG_STROBE_CFG].regno, + preg[REG_STROBE_CFG].mask, + reg_val << + preg[REG_STROBE_CFG].shift); + if (ret < 0) + goto out; + opmode = MODE_SHDN; + dev_info(chip->dev, + "flash brt is set - ext. strobe pin mode\n"); + } + break; + + case MODE_INDIC: + ret = + regmap_update_bits(chip->regmap, preg[REG_INDI_CTRL].regno, + preg[REG_INDI_CTRL].mask, + (brightness - 1) + << preg[REG_INDI_CTRL].shift); + if (ret < 0) + goto out; + + if (pdata->pin_tx2 != LM355x_PIN_TX_DISABLE) { + ret = + regmap_update_bits(chip->regmap, + preg[REG_INDI_CFG].regno, + preg[REG_INDI_CFG].mask, + 0x01 << + preg[REG_INDI_CFG].shift); + if (ret < 0) + goto out; + opmode = MODE_SHDN; + } + break; + case MODE_SHDN: + break; + default: + return; + } + /* operation mode control */ + ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno, + preg[REG_OPMODE].mask, + opmode << preg[REG_OPMODE].shift); + if (ret < 0) + goto out; + return; +out: + dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); + return; +} + +/* torch */ +static void lm355x_deferred_torch_brightness_set(struct work_struct *work) +{ + struct lm355x_chip_data *chip = + container_of(work, struct lm355x_chip_data, work_torch); + + mutex_lock(&chip->lock); + lm355x_control(chip, chip->br_torch, MODE_TORCH); + mutex_unlock(&chip->lock); +} + +static void lm355x_torch_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct lm355x_chip_data *chip = + container_of(cdev, struct lm355x_chip_data, cdev_torch); + + chip->br_torch = brightness; + schedule_work(&chip->work_torch); +} + +/* flash */ +static void lm355x_deferred_strobe_brightness_set(struct work_struct *work) +{ + struct lm355x_chip_data *chip = + container_of(work, struct lm355x_chip_data, work_flash); + + mutex_lock(&chip->lock); + lm355x_control(chip, chip->br_flash, MODE_FLASH); + mutex_unlock(&chip->lock); +} + +static void lm355x_strobe_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct lm355x_chip_data *chip = + container_of(cdev, struct lm355x_chip_data, cdev_flash); + + chip->br_flash = brightness; + schedule_work(&chip->work_flash); +} + +/* indicator */ +static void lm355x_deferred_indicator_brightness_set(struct work_struct *work) +{ + struct lm355x_chip_data *chip = + container_of(work, struct lm355x_chip_data, work_indicator); + + mutex_lock(&chip->lock); + lm355x_control(chip, chip->br_indicator, MODE_INDIC); + mutex_unlock(&chip->lock); +} + +static void lm355x_indicator_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct lm355x_chip_data *chip = + container_of(cdev, struct lm355x_chip_data, cdev_indicator); + + chip->br_indicator = brightness; + schedule_work(&chip->work_indicator); +} + +/* indicator pattern only for lm3556*/ +static ssize_t lm3556_indicator_pattern_store(struct device *dev, + struct device_attribute *devAttr, + const char *buf, size_t size) +{ + ssize_t ret; + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm355x_chip_data *chip = + container_of(led_cdev, struct lm355x_chip_data, cdev_indicator); + unsigned int state; + + ret = kstrtouint(buf, 10, &state); + if (ret) + goto out; + if (state > INDIC_PATTERN_SIZE - 1) + state = INDIC_PATTERN_SIZE - 1; + + ret = regmap_write(chip->regmap, 0x04, + indicator_pattern[state].blinking); + if (ret < 0) + goto out; + + ret = regmap_write(chip->regmap, 0x05, + indicator_pattern[state].period_cnt); + if (ret < 0) + goto out; + + return size; +out: + dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); + return size; +} + +static DEVICE_ATTR(pattern, 0666, NULL, lm3556_indicator_pattern_store); + +static const struct regmap_config lm355x_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xFF, +}; + +/* module initialize */ +static int __devinit lm355x_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct lm355x_platform_data *pdata = client->dev.platform_data; + struct lm355x_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 lm355x_chip_data), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->dev = &client->dev; + chip->type = id->driver_data; + switch (id->driver_data) { + case CHIP_LM3554: + chip->regs = lm3554_regs; + break; + case CHIP_LM3556: + chip->regs = lm3556_regs; + break; + default: + return -ENOSYS; + } + chip->pdata = pdata; + + chip->regmap = devm_regmap_init_i2c(client, &lm355x_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 = lm355x_chip_init(chip); + if (err < 0) + goto err_out; + + /* flash */ + INIT_WORK(&chip->work_flash, lm355x_deferred_strobe_brightness_set); + chip->cdev_flash.name = "flash"; + chip->cdev_flash.max_brightness = 16; + chip->cdev_flash.brightness_set = lm355x_strobe_brightness_set; + err = led_classdev_register((struct device *) + &client->dev, &chip->cdev_flash); + if (err < 0) + goto err_out; + /* torch */ + INIT_WORK(&chip->work_torch, lm355x_deferred_torch_brightness_set); + chip->cdev_torch.name = "torch"; + chip->cdev_torch.max_brightness = 8; + chip->cdev_torch.brightness_set = lm355x_torch_brightness_set; + err = led_classdev_register((struct device *) + &client->dev, &chip->cdev_torch); + if (err < 0) + goto err_create_torch_file; + /* indicator */ + INIT_WORK(&chip->work_indicator, + lm355x_deferred_indicator_brightness_set); + chip->cdev_indicator.name = "indicator"; + if (id->driver_data == CHIP_LM3554) + chip->cdev_indicator.max_brightness = 4; + else + chip->cdev_indicator.max_brightness = 8; + chip->cdev_indicator.brightness_set = lm355x_indicator_brightness_set; + err = led_classdev_register((struct device *) + &client->dev, &chip->cdev_indicator); + if (err < 0) + goto err_create_indicator_file; + /* indicator pattern control only for LM3554 */ + if (id->driver_data == CHIP_LM3556) { + err = + device_create_file(chip->cdev_indicator.dev, + &dev_attr_pattern); + if (err < 0) + goto err_create_pattern_file; + } + + dev_info(&client->dev, "%s is initialized\n", + lm355x_name[id->driver_data]); + return 0; + +err_create_pattern_file: + led_classdev_unregister(&chip->cdev_indicator); +err_create_indicator_file: + led_classdev_unregister(&chip->cdev_torch); +err_create_torch_file: + led_classdev_unregister(&chip->cdev_flash); +err_out: + return err; +} + +static int __devexit lm355x_remove(struct i2c_client *client) +{ + struct lm355x_chip_data *chip = i2c_get_clientdata(client); + struct lm355x_reg_data *preg = chip->regs; + + regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0); + if (chip->type == CHIP_LM3556) + device_remove_file(chip->cdev_indicator.dev, &dev_attr_pattern); + led_classdev_unregister(&chip->cdev_indicator); + flush_work(&chip->work_indicator); + led_classdev_unregister(&chip->cdev_torch); + flush_work(&chip->work_torch); + led_classdev_unregister(&chip->cdev_flash); + flush_work(&chip->work_flash); + dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]); + + return 0; +} + +static const struct i2c_device_id lm355x_id[] = { + {LM3554_NAME, CHIP_LM3554}, + {LM3556_NAME, CHIP_LM3556}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, lm355x_id); + +static struct i2c_driver lm355x_i2c_driver = { + .driver = { + .name = LM355x_NAME, + .owner = THIS_MODULE, + .pm = NULL, + }, + .probe = lm355x_probe, + .remove = __devexit_p(lm355x_remove), + .id_table = lm355x_id, +}; + +module_i2c_driver(lm355x_i2c_driver); + +MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x"); +MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); +MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); +MODULE_LICENSE("GPL v2"); |