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|
/*
* 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
|