diff options
author | G.Shark Jeong <gshark.jeong@gmail.com> | 2012-06-22 08:12:06 +0800 |
---|---|---|
committer | Bryan Wu <bryan.wu@canonical.com> | 2012-07-24 07:52:35 +0800 |
commit | 32abb4788d3fff69fa242c7850e39ec1418df4f4 (patch) | |
tree | 26441f5ebda1a77b7f0f72fb6b487634b2e623c0 /drivers/leds | |
parent | 1522d02e275332080ec27e268edc29c79c6f5e0c (diff) | |
download | linux-32abb4788d3fff69fa242c7850e39ec1418df4f4.tar.bz2 |
leds: Add LED driver for lm3556 chip
LM3556 :
The LM3556 is a 4 MHz fixed-frequency synchronous boost
converter plus 1.5A constant current driver for a high-current white LED.
Datasheet: www.national.com/ds/LM/LM3556.pdf
Tested on OMAP4430
(bryan.wu@canonical.com: use module_i2c_driver() rather than
lm3556_init/lm3556_exit for code simplicity; fixed some typo
pointed out by Rob Landley)
Signed-off-by: G.Shark Jeong <gshark.jeong@gmail.com>
Reviewed-by: Axel Lin <axel.lin@gmail.com>
Reviewed-by: Kim, Milo <Milo.Kim@ti.com>
Acked-by: Rob Landley <rob@landley.net>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r-- | drivers/leds/Kconfig | 8 | ||||
-rw-r--r-- | drivers/leds/Makefile | 1 | ||||
-rw-r--r-- | drivers/leds/leds-lm3556.c | 512 |
3 files changed, 521 insertions, 0 deletions
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 52f1d456f3d2..f028f0348e83 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -415,6 +415,14 @@ config LEDS_MAX8997 This option enables support for on-chip LED drivers on MAXIM MAX8997 PMIC. +config LEDS_LM3556 + tristate "LED support for LM3556 Chip" + depends on LEDS_CLASS && I2C + select REGMAP_I2C + help + This option enables support for LEDs connected to LM3556. + LM3556 includes Torch, Flash and Indicator functions. + config LEDS_OT200 tristate "LED support for the Bachmann OT200" depends on LEDS_CLASS && HAS_IOMEM diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 9112d518f9d4..5eebd7bce4be 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -47,6 +47,7 @@ obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o obj-$(CONFIG_LEDS_RENESAS_TPU) += leds-renesas-tpu.o obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o +obj-$(CONFIG_LEDS_LM3556) += leds-lm3556.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff --git a/drivers/leds/leds-lm3556.c b/drivers/leds/leds-lm3556.c new file mode 100644 index 000000000000..3062abd9a532 --- /dev/null +++ b/drivers/leds/leds-lm3556.c @@ -0,0 +1,512 @@ +/* + * Simple driver for Texas Instruments LM3556 LED Flash driver chip (Rev0x03) + * 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. + * + * Please refer Documentation/leds/leds-lm3556.txt file. + */ +#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-lm3556.h> + +#define REG_FILT_TIME (0x0) +#define REG_IVFM_MODE (0x1) +#define REG_NTC (0x2) +#define REG_INDIC_TIME (0x3) +#define REG_INDIC_BLINK (0x4) +#define REG_INDIC_PERIOD (0x5) +#define REG_TORCH_TIME (0x6) +#define REG_CONF (0x7) +#define REG_FLASH (0x8) +#define REG_I_CTRL (0x9) +#define REG_ENABLE (0xA) +#define REG_FLAG (0xB) +#define REG_MAX (0xB) + +#define IVFM_FILTER_TIME_SHIFT (3) +#define UVLO_EN_SHIFT (7) +#define HYSTERSIS_SHIFT (5) +#define IVM_D_TH_SHIFT (2) +#define IVFM_ADJ_MODE_SHIFT (0) +#define NTC_EVENT_LVL_SHIFT (5) +#define NTC_TRIP_TH_SHIFT (2) +#define NTC_BIAS_I_LVL_SHIFT (0) +#define INDIC_RAMP_UP_TIME_SHIFT (3) +#define INDIC_RAMP_DN_TIME_SHIFT (0) +#define INDIC_N_BLANK_SHIFT (4) +#define INDIC_PULSE_TIME_SHIFT (0) +#define INDIC_N_PERIOD_SHIFT (0) +#define TORCH_RAMP_UP_TIME_SHIFT (3) +#define TORCH_RAMP_DN_TIME_SHIFT (0) +#define STROBE_USUAGE_SHIFT (7) +#define STROBE_PIN_POLARITY_SHIFT (6) +#define TORCH_PIN_POLARITY_SHIFT (5) +#define TX_PIN_POLARITY_SHIFT (4) +#define TX_EVENT_LVL_SHIFT (3) +#define IVFM_EN_SHIFT (2) +#define NTC_MODE_SHIFT (1) +#define INDIC_MODE_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 NTC_EN_SHIFT (7) +#define TX_PIN_EN_SHIFT (6) +#define STROBE_PIN_EN_SHIFT (5) +#define TORCH_PIN_EN_SHIFT (4) +#define PRECHG_MODE_EN_SHIFT (3) +#define PASS_MODE_ONLY_EN_SHIFT (2) +#define MODE_BITS_SHIFT (0) + +#define IVFM_FILTER_TIME_MASK (0x3) +#define UVLO_EN_MASK (0x1) +#define HYSTERSIS_MASK (0x3) +#define IVM_D_TH_MASK (0x7) +#define IVFM_ADJ_MODE_MASK (0x3) +#define NTC_EVENT_LVL_MASK (0x1) +#define NTC_TRIP_TH_MASK (0x7) +#define NTC_BIAS_I_LVL_MASK (0x3) +#define INDIC_RAMP_UP_TIME_MASK (0x7) +#define INDIC_RAMP_DN_TIME_MASK (0x7) +#define INDIC_N_BLANK_MASK (0x7) +#define INDIC_PULSE_TIME_MASK (0x7) +#define INDIC_N_PERIOD_MASK (0x7) +#define TORCH_RAMP_UP_TIME_MASK (0x7) +#define TORCH_RAMP_DN_TIME_MASK (0x7) +#define STROBE_USUAGE_MASK (0x1) +#define STROBE_PIN_POLARITY_MASK (0x1) +#define TORCH_PIN_POLARITY_MASK (0x1) +#define TX_PIN_POLARITY_MASK (0x1) +#define TX_EVENT_LVL_MASK (0x1) +#define IVFM_EN_MASK (0x1) +#define NTC_MODE_MASK (0x1) +#define INDIC_MODE_MASK (0x1) +#define INDUCTOR_I_LIMIT_MASK (0x3) +#define FLASH_RAMP_TIME_MASK (0x7) +#define FLASH_TOUT_TIME_MASK (0x7) +#define TORCH_I_MASK (0x7) +#define FLASH_I_MASK (0xF) +#define NTC_EN_MASK (0x1) +#define TX_PIN_EN_MASK (0x1) +#define STROBE_PIN_EN_MASK (0x1) +#define TORCH_PIN_EN_MASK (0x1) +#define PRECHG_MODE_EN_MASK (0x1) +#define PASS_MODE_ONLY_EN_MASK (0x1) +#define MODE_BITS_MASK (0x13) +#define EX_PIN_CONTROL_MASK (0xF1) +#define EX_PIN_ENABLE_MASK (0x70) + +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, +}; + +enum lm3556_mode { + MODES_STASNDBY = 0, + MODES_INDIC, + MODES_TORCH, + MODES_FLASH +}; + +#define INDIC_PATTERN_SIZE 4 + +struct indicator { + u8 blinking; + u8 period_cnt; +}; + +struct lm3556_chip_data { + struct device *dev; + + struct led_classdev cdev_flash; + struct led_classdev cdev_torch; + struct led_classdev cdev_indicator; + + struct lm3556_platform_data *pdata; + struct regmap *regmap; + struct mutex lock; + + unsigned int last_flag; +}; + +/* indicator pattern */ +static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = { + [0] = {(INDIC_N_BLANK_1 << INDIC_N_BLANK_SHIFT) + | PULSE_TIME_32_MS, INDIC_PERIOD_1}, + [1] = {(INDIC_N_BLANK_15 << INDIC_N_BLANK_SHIFT) + | PULSE_TIME_32_MS, INDIC_PERIOD_2}, + [2] = {(INDIC_N_BLANK_10 << INDIC_N_BLANK_SHIFT) + | PULSE_TIME_32_MS, INDIC_PERIOD_4}, + [3] = {(INDIC_N_BLANK_5 << INDIC_N_BLANK_SHIFT) + | PULSE_TIME_32_MS, INDIC_PERIOD_7}, +}; + +/* chip initialize */ +static int __devinit lm3556_chip_init(struct lm3556_chip_data *chip) +{ + unsigned int reg_val; + int ret; + struct lm3556_platform_data *pdata = chip->pdata; + + /* set config register */ + ret = regmap_read(chip->regmap, REG_CONF, ®_val); + if (ret < 0) { + dev_err(chip->dev, "Failed to read REG_CONF Register\n"); + goto out; + } + + reg_val &= (~EX_PIN_CONTROL_MASK); + reg_val |= ((pdata->torch_pin_polarity & 0x01) + << TORCH_PIN_POLARITY_SHIFT); + reg_val |= ((pdata->strobe_usuage & 0x01) << STROBE_USUAGE_SHIFT); + reg_val |= ((pdata->strobe_pin_polarity & 0x01) + << STROBE_PIN_POLARITY_SHIFT); + reg_val |= ((pdata->tx_pin_polarity & 0x01) << TX_PIN_POLARITY_SHIFT); + reg_val |= ((pdata->indicator_mode & 0x01) << INDIC_MODE_SHIFT); + + ret = regmap_write(chip->regmap, REG_CONF, reg_val); + if (ret < 0) { + dev_err(chip->dev, "Failed to write REG_CONF Regisgter\n"); + goto out; + } + + /* set enable register */ + ret = regmap_read(chip->regmap, REG_ENABLE, ®_val); + if (ret < 0) { + dev_err(chip->dev, "Failed to read REG_ENABLE Register\n"); + goto out; + } + + reg_val &= (~EX_PIN_ENABLE_MASK); + reg_val |= ((pdata->torch_pin_en & 0x01) << TORCH_PIN_EN_SHIFT); + reg_val |= ((pdata->strobe_pin_en & 0x01) << STROBE_PIN_EN_SHIFT); + reg_val |= ((pdata->tx_pin_en & 0x01) << TX_PIN_EN_SHIFT); + + ret = regmap_write(chip->regmap, REG_ENABLE, reg_val); + if (ret < 0) { + dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n"); + goto out; + } + +out: + return ret; +} + +/* chip control */ +static int lm3556_control(struct lm3556_chip_data *chip, + u8 brightness, enum lm3556_mode opmode) +{ + int ret; + struct lm3556_platform_data *pdata = chip->pdata; + + 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 (pdata->torch_pin_en) + 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); + 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: + if (pdata->torch_pin_en) + opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT); + break; + + default: + return ret; + } + if (ret < 0) { + dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n"); + goto out; + } + ret = regmap_update_bits(chip->regmap, REG_ENABLE, + MODE_BITS_MASK << MODE_BITS_SHIFT, + opmode << MODE_BITS_SHIFT); + +out: + return ret; +} + +/* torch */ +static void lm3556_torch_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct lm3556_chip_data *chip = + container_of(cdev, struct lm3556_chip_data, cdev_torch); + + mutex_lock(&chip->lock); + lm3556_control(chip, brightness, MODES_TORCH); + mutex_unlock(&chip->lock); +} + +/* flash */ +static void lm3556_strobe_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct lm3556_chip_data *chip = + container_of(cdev, struct lm3556_chip_data, cdev_flash); + + mutex_lock(&chip->lock); + lm3556_control(chip, brightness, MODES_FLASH); + mutex_unlock(&chip->lock); +} + +/* indicator */ +static void lm3556_indicator_brightness_set(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct lm3556_chip_data *chip = + container_of(cdev, struct lm3556_chip_data, cdev_indicator); + + mutex_lock(&chip->lock); + lm3556_control(chip, brightness, MODES_INDIC); + mutex_unlock(&chip->lock); +} + +/* indicator pattern */ +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 lm3556_chip_data *chip = + container_of(led_cdev, struct lm3556_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, REG_INDIC_BLINK, + indicator_pattern[state].blinking); + if (ret < 0) { + dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n"); + goto out; + } + + ret = regmap_write(chip->regmap, REG_INDIC_PERIOD, + indicator_pattern[state].period_cnt); + if (ret < 0) { + dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n"); + goto out; + } + + return size; +out: + dev_err(chip->dev, "Indicator pattern doesn't saved\n"); + return size; +} + +static DEVICE_ATTR(pattern, 0666, NULL, lm3556_indicator_pattern_store); + +static const struct regmap_config lm3556_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = REG_MAX, +}; + +/* module initialize */ +static int __devinit lm3556_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct lm3556_platform_data *pdata = client->dev.platform_data; + struct lm3556_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 lm3556_chip_data), + GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->dev = &client->dev; + chip->pdata = pdata; + + chip->regmap = devm_regmap_init_i2c(client, &lm3556_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 = lm3556_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 = lm3556_strobe_brightness_set; + err = led_classdev_register((struct device *) + &client->dev, &chip->cdev_flash); + if (err < 0) + goto err_out; + /* torch */ + chip->cdev_torch.name = "torch"; + chip->cdev_torch.max_brightness = 8; + chip->cdev_torch.brightness_set = lm3556_torch_brightness_set; + err = led_classdev_register((struct device *) + &client->dev, &chip->cdev_torch); + if (err < 0) + goto err_create_torch_file; + /* indicator */ + chip->cdev_indicator.name = "indicator"; + chip->cdev_indicator.max_brightness = 8; + chip->cdev_indicator.brightness_set = lm3556_indicator_brightness_set; + err = led_classdev_register((struct device *) + &client->dev, &chip->cdev_indicator); + if (err < 0) + goto err_create_indicator_file; + + err = device_create_file(chip->cdev_indicator.dev, &dev_attr_pattern); + if (err < 0) + goto err_create_pattern_file; + + dev_info(&client->dev, "LM3556 is initialized\n"); + 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 lm3556_remove(struct i2c_client *client) +{ + struct lm3556_chip_data *chip = i2c_get_clientdata(client); + + device_remove_file(chip->cdev_indicator.dev, &dev_attr_pattern); + 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; +} + +static const struct i2c_device_id lm3556_id[] = { + {LM3556_NAME, 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, lm3556_id); + +static struct i2c_driver lm3556_i2c_driver = { + .driver = { + .name = LM3556_NAME, + .owner = THIS_MODULE, + .pm = NULL, + }, + .probe = lm3556_probe, + .remove = __devexit_p(lm3556_remove), + .id_table = lm3556_id, +}; + +module_i2c_driver(lm3556_i2c_driver); + +MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3556"); +MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); +MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); +MODULE_LICENSE("GPL v2"); |