513 lines
13 KiB
C
513 lines
13 KiB
C
/*
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* Simple driver for Texas Instruments LM3556 LED Flash driver chip (Rev0x03)
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* Copyright (C) 2012 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Please refer Documentation/leds/leds-lm3556.txt file.
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/fs.h>
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#include <linux/regmap.h>
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#include <linux/platform_data/leds-lm3556.h>
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#define REG_FILT_TIME (0x0)
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#define REG_IVFM_MODE (0x1)
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#define REG_NTC (0x2)
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#define REG_INDIC_TIME (0x3)
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#define REG_INDIC_BLINK (0x4)
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#define REG_INDIC_PERIOD (0x5)
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#define REG_TORCH_TIME (0x6)
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#define REG_CONF (0x7)
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#define REG_FLASH (0x8)
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#define REG_I_CTRL (0x9)
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#define REG_ENABLE (0xA)
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#define REG_FLAG (0xB)
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#define REG_MAX (0xB)
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#define IVFM_FILTER_TIME_SHIFT (3)
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#define UVLO_EN_SHIFT (7)
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#define HYSTERSIS_SHIFT (5)
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#define IVM_D_TH_SHIFT (2)
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#define IVFM_ADJ_MODE_SHIFT (0)
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#define NTC_EVENT_LVL_SHIFT (5)
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#define NTC_TRIP_TH_SHIFT (2)
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#define NTC_BIAS_I_LVL_SHIFT (0)
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#define INDIC_RAMP_UP_TIME_SHIFT (3)
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#define INDIC_RAMP_DN_TIME_SHIFT (0)
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#define INDIC_N_BLANK_SHIFT (4)
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#define INDIC_PULSE_TIME_SHIFT (0)
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#define INDIC_N_PERIOD_SHIFT (0)
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#define TORCH_RAMP_UP_TIME_SHIFT (3)
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#define TORCH_RAMP_DN_TIME_SHIFT (0)
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#define STROBE_USUAGE_SHIFT (7)
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#define STROBE_PIN_POLARITY_SHIFT (6)
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#define TORCH_PIN_POLARITY_SHIFT (5)
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#define TX_PIN_POLARITY_SHIFT (4)
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#define TX_EVENT_LVL_SHIFT (3)
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#define IVFM_EN_SHIFT (2)
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#define NTC_MODE_SHIFT (1)
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#define INDIC_MODE_SHIFT (0)
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#define INDUCTOR_I_LIMIT_SHIFT (6)
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#define FLASH_RAMP_TIME_SHIFT (3)
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#define FLASH_TOUT_TIME_SHIFT (0)
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#define TORCH_I_SHIFT (4)
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#define FLASH_I_SHIFT (0)
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#define NTC_EN_SHIFT (7)
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#define TX_PIN_EN_SHIFT (6)
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#define STROBE_PIN_EN_SHIFT (5)
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#define TORCH_PIN_EN_SHIFT (4)
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#define PRECHG_MODE_EN_SHIFT (3)
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#define PASS_MODE_ONLY_EN_SHIFT (2)
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#define MODE_BITS_SHIFT (0)
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#define IVFM_FILTER_TIME_MASK (0x3)
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#define UVLO_EN_MASK (0x1)
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#define HYSTERSIS_MASK (0x3)
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#define IVM_D_TH_MASK (0x7)
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#define IVFM_ADJ_MODE_MASK (0x3)
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#define NTC_EVENT_LVL_MASK (0x1)
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#define NTC_TRIP_TH_MASK (0x7)
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#define NTC_BIAS_I_LVL_MASK (0x3)
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#define INDIC_RAMP_UP_TIME_MASK (0x7)
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#define INDIC_RAMP_DN_TIME_MASK (0x7)
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#define INDIC_N_BLANK_MASK (0x7)
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#define INDIC_PULSE_TIME_MASK (0x7)
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#define INDIC_N_PERIOD_MASK (0x7)
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#define TORCH_RAMP_UP_TIME_MASK (0x7)
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#define TORCH_RAMP_DN_TIME_MASK (0x7)
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#define STROBE_USUAGE_MASK (0x1)
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#define STROBE_PIN_POLARITY_MASK (0x1)
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#define TORCH_PIN_POLARITY_MASK (0x1)
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#define TX_PIN_POLARITY_MASK (0x1)
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#define TX_EVENT_LVL_MASK (0x1)
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#define IVFM_EN_MASK (0x1)
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#define NTC_MODE_MASK (0x1)
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#define INDIC_MODE_MASK (0x1)
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#define INDUCTOR_I_LIMIT_MASK (0x3)
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#define FLASH_RAMP_TIME_MASK (0x7)
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#define FLASH_TOUT_TIME_MASK (0x7)
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#define TORCH_I_MASK (0x7)
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#define FLASH_I_MASK (0xF)
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#define NTC_EN_MASK (0x1)
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#define TX_PIN_EN_MASK (0x1)
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#define STROBE_PIN_EN_MASK (0x1)
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#define TORCH_PIN_EN_MASK (0x1)
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#define PRECHG_MODE_EN_MASK (0x1)
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#define PASS_MODE_ONLY_EN_MASK (0x1)
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#define MODE_BITS_MASK (0x13)
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#define EX_PIN_CONTROL_MASK (0xF1)
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#define EX_PIN_ENABLE_MASK (0x70)
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enum lm3556_indic_pulse_time {
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PULSE_TIME_0_MS = 0,
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PULSE_TIME_32_MS,
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PULSE_TIME_64_MS,
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PULSE_TIME_92_MS,
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PULSE_TIME_128_MS,
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PULSE_TIME_160_MS,
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PULSE_TIME_196_MS,
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PULSE_TIME_224_MS,
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PULSE_TIME_256_MS,
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PULSE_TIME_288_MS,
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PULSE_TIME_320_MS,
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PULSE_TIME_352_MS,
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PULSE_TIME_384_MS,
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PULSE_TIME_416_MS,
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PULSE_TIME_448_MS,
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PULSE_TIME_480_MS,
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};
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enum lm3556_indic_n_blank {
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INDIC_N_BLANK_0 = 0,
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INDIC_N_BLANK_1,
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INDIC_N_BLANK_2,
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INDIC_N_BLANK_3,
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INDIC_N_BLANK_4,
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INDIC_N_BLANK_5,
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INDIC_N_BLANK_6,
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INDIC_N_BLANK_7,
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INDIC_N_BLANK_8,
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INDIC_N_BLANK_9,
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INDIC_N_BLANK_10,
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INDIC_N_BLANK_11,
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INDIC_N_BLANK_12,
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INDIC_N_BLANK_13,
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INDIC_N_BLANK_14,
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INDIC_N_BLANK_15,
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};
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enum lm3556_indic_period {
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INDIC_PERIOD_0 = 0,
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INDIC_PERIOD_1,
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INDIC_PERIOD_2,
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INDIC_PERIOD_3,
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INDIC_PERIOD_4,
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INDIC_PERIOD_5,
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INDIC_PERIOD_6,
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INDIC_PERIOD_7,
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};
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enum lm3556_mode {
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MODES_STASNDBY = 0,
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MODES_INDIC,
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MODES_TORCH,
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MODES_FLASH
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};
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#define INDIC_PATTERN_SIZE 4
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struct indicator {
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u8 blinking;
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u8 period_cnt;
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};
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struct lm3556_chip_data {
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struct device *dev;
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struct led_classdev cdev_flash;
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struct led_classdev cdev_torch;
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struct led_classdev cdev_indicator;
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struct lm3556_platform_data *pdata;
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struct regmap *regmap;
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struct mutex lock;
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unsigned int last_flag;
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};
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/* indicator pattern */
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static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
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[0] = {(INDIC_N_BLANK_1 << INDIC_N_BLANK_SHIFT)
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| PULSE_TIME_32_MS, INDIC_PERIOD_1},
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[1] = {(INDIC_N_BLANK_15 << INDIC_N_BLANK_SHIFT)
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| PULSE_TIME_32_MS, INDIC_PERIOD_2},
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[2] = {(INDIC_N_BLANK_10 << INDIC_N_BLANK_SHIFT)
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| PULSE_TIME_32_MS, INDIC_PERIOD_4},
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[3] = {(INDIC_N_BLANK_5 << INDIC_N_BLANK_SHIFT)
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| PULSE_TIME_32_MS, INDIC_PERIOD_7},
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};
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/* chip initialize */
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static int __devinit lm3556_chip_init(struct lm3556_chip_data *chip)
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{
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unsigned int reg_val;
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int ret;
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struct lm3556_platform_data *pdata = chip->pdata;
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/* set config register */
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ret = regmap_read(chip->regmap, REG_CONF, ®_val);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to read REG_CONF Register\n");
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goto out;
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}
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reg_val &= (~EX_PIN_CONTROL_MASK);
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reg_val |= ((pdata->torch_pin_polarity & 0x01)
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<< TORCH_PIN_POLARITY_SHIFT);
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reg_val |= ((pdata->strobe_usuage & 0x01) << STROBE_USUAGE_SHIFT);
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reg_val |= ((pdata->strobe_pin_polarity & 0x01)
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<< STROBE_PIN_POLARITY_SHIFT);
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reg_val |= ((pdata->tx_pin_polarity & 0x01) << TX_PIN_POLARITY_SHIFT);
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reg_val |= ((pdata->indicator_mode & 0x01) << INDIC_MODE_SHIFT);
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ret = regmap_write(chip->regmap, REG_CONF, reg_val);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to write REG_CONF Regisgter\n");
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goto out;
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}
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/* set enable register */
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ret = regmap_read(chip->regmap, REG_ENABLE, ®_val);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to read REG_ENABLE Register\n");
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goto out;
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}
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reg_val &= (~EX_PIN_ENABLE_MASK);
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reg_val |= ((pdata->torch_pin_en & 0x01) << TORCH_PIN_EN_SHIFT);
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reg_val |= ((pdata->strobe_pin_en & 0x01) << STROBE_PIN_EN_SHIFT);
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reg_val |= ((pdata->tx_pin_en & 0x01) << TX_PIN_EN_SHIFT);
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ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
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goto out;
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}
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out:
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return ret;
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}
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/* chip control */
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static int lm3556_control(struct lm3556_chip_data *chip,
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u8 brightness, enum lm3556_mode opmode)
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{
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int ret;
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struct lm3556_platform_data *pdata = chip->pdata;
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ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
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goto out;
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}
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if (chip->last_flag)
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dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
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/* brightness 0 means off-state */
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if (!brightness)
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opmode = MODES_STASNDBY;
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switch (opmode) {
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case MODES_TORCH:
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ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
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TORCH_I_MASK << TORCH_I_SHIFT,
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(brightness - 1) << TORCH_I_SHIFT);
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if (pdata->torch_pin_en)
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opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
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break;
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case MODES_FLASH:
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ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
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FLASH_I_MASK << FLASH_I_SHIFT,
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(brightness - 1) << FLASH_I_SHIFT);
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break;
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case MODES_INDIC:
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ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
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TORCH_I_MASK << TORCH_I_SHIFT,
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(brightness - 1) << TORCH_I_SHIFT);
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break;
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case MODES_STASNDBY:
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if (pdata->torch_pin_en)
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opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
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break;
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default:
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return ret;
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}
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if (ret < 0) {
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dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
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goto out;
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}
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ret = regmap_update_bits(chip->regmap, REG_ENABLE,
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MODE_BITS_MASK << MODE_BITS_SHIFT,
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opmode << MODE_BITS_SHIFT);
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out:
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return ret;
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}
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/* torch */
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static void lm3556_torch_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct lm3556_chip_data *chip =
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container_of(cdev, struct lm3556_chip_data, cdev_torch);
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mutex_lock(&chip->lock);
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lm3556_control(chip, brightness, MODES_TORCH);
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mutex_unlock(&chip->lock);
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}
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/* flash */
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static void lm3556_strobe_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct lm3556_chip_data *chip =
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container_of(cdev, struct lm3556_chip_data, cdev_flash);
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mutex_lock(&chip->lock);
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lm3556_control(chip, brightness, MODES_FLASH);
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mutex_unlock(&chip->lock);
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}
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/* indicator */
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static void lm3556_indicator_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct lm3556_chip_data *chip =
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container_of(cdev, struct lm3556_chip_data, cdev_indicator);
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mutex_lock(&chip->lock);
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lm3556_control(chip, brightness, MODES_INDIC);
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mutex_unlock(&chip->lock);
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}
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/* indicator pattern */
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static ssize_t lm3556_indicator_pattern_store(struct device *dev,
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struct device_attribute *devAttr,
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const char *buf, size_t size)
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{
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ssize_t ret;
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct lm3556_chip_data *chip =
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container_of(led_cdev, struct lm3556_chip_data, cdev_indicator);
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unsigned int state;
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ret = kstrtouint(buf, 10, &state);
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if (ret)
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goto out;
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if (state > INDIC_PATTERN_SIZE - 1)
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state = INDIC_PATTERN_SIZE - 1;
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ret = regmap_write(chip->regmap, REG_INDIC_BLINK,
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indicator_pattern[state].blinking);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
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goto out;
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}
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ret = regmap_write(chip->regmap, REG_INDIC_PERIOD,
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indicator_pattern[state].period_cnt);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to write REG_ENABLE Regisgter\n");
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goto out;
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}
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return size;
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out:
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dev_err(chip->dev, "Indicator pattern doesn't saved\n");
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return size;
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}
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static DEVICE_ATTR(pattern, 0666, NULL, lm3556_indicator_pattern_store);
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static const struct regmap_config lm3556_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = REG_MAX,
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};
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/* module initialize */
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static int __devinit lm3556_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct lm3556_platform_data *pdata = client->dev.platform_data;
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struct lm3556_chip_data *chip;
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int err;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "i2c functionality check fail.\n");
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return -EOPNOTSUPP;
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}
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if (pdata == NULL) {
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dev_err(&client->dev, "Needs Platform Data.\n");
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return -ENODATA;
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}
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chip =
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devm_kzalloc(&client->dev, sizeof(struct lm3556_chip_data),
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GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->dev = &client->dev;
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chip->pdata = pdata;
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chip->regmap = devm_regmap_init_i2c(client, &lm3556_regmap);
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if (IS_ERR(chip->regmap)) {
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err = PTR_ERR(chip->regmap);
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dev_err(&client->dev, "Failed to allocate register map: %d\n",
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err);
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return err;
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}
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mutex_init(&chip->lock);
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i2c_set_clientdata(client, chip);
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err = lm3556_chip_init(chip);
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if (err < 0)
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goto err_out;
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/* flash */
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chip->cdev_flash.name = "flash";
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chip->cdev_flash.max_brightness = 16;
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chip->cdev_flash.brightness_set = lm3556_strobe_brightness_set;
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err = led_classdev_register((struct device *)
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&client->dev, &chip->cdev_flash);
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if (err < 0)
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goto err_out;
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/* torch */
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chip->cdev_torch.name = "torch";
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chip->cdev_torch.max_brightness = 8;
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chip->cdev_torch.brightness_set = lm3556_torch_brightness_set;
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err = led_classdev_register((struct device *)
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&client->dev, &chip->cdev_torch);
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if (err < 0)
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goto err_create_torch_file;
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/* indicator */
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chip->cdev_indicator.name = "indicator";
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chip->cdev_indicator.max_brightness = 8;
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chip->cdev_indicator.brightness_set = lm3556_indicator_brightness_set;
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err = led_classdev_register((struct device *)
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&client->dev, &chip->cdev_indicator);
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if (err < 0)
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goto err_create_indicator_file;
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err = device_create_file(chip->cdev_indicator.dev, &dev_attr_pattern);
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if (err < 0)
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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");
|