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416 lines
10 KiB
416 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Simple driver for Texas Instruments LM3642 LED Flash driver chip |
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* Copyright (C) 2012 Texas Instruments |
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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-lm3642.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_TORCH_TIME (0x6) |
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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 UVLO_EN_SHIFT (7) |
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#define IVM_D_TH_SHIFT (2) |
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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 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 IVFM_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 MODE_BITS_SHIFT (0) |
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#define UVLO_EN_MASK (0x1) |
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#define IVM_D_TH_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 INDUCTOR_I_LIMIT_MASK (0x1) |
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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 IVFM_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 MODE_BITS_MASK (0x73) |
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#define EX_PIN_CONTROL_MASK (0x71) |
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#define EX_PIN_ENABLE_MASK (0x70) |
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enum lm3642_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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struct lm3642_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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u8 br_flash; |
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u8 br_torch; |
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u8 br_indicator; |
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enum lm3642_torch_pin_enable torch_pin; |
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enum lm3642_strobe_pin_enable strobe_pin; |
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enum lm3642_tx_pin_enable tx_pin; |
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struct lm3642_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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/* chip initialize */ |
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static int lm3642_chip_init(struct lm3642_chip_data *chip) |
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{ |
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int ret; |
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struct lm3642_platform_data *pdata = chip->pdata; |
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/* set enable register */ |
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ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK, |
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pdata->tx_pin); |
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if (ret < 0) |
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dev_err(chip->dev, "Failed to update REG_ENABLE Register\n"); |
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return ret; |
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} |
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/* chip control */ |
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static int lm3642_control(struct lm3642_chip_data *chip, |
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u8 brightness, enum lm3642_mode opmode) |
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{ |
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int ret; |
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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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return ret; |
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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 (chip->torch_pin) |
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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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if (chip->strobe_pin) |
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opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_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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break; |
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default: |
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return -EINVAL; |
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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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return ret; |
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} |
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if (chip->tx_pin) |
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opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT); |
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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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return ret; |
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} |
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/* torch */ |
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/* torch pin config for lm3642 */ |
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static ssize_t torch_pin_store(struct device *dev, |
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struct device_attribute *attr, |
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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 lm3642_chip_data *chip = |
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container_of(led_cdev, struct lm3642_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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return ret; |
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if (state != 0) |
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state = 0x01 << TORCH_PIN_EN_SHIFT; |
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chip->torch_pin = state; |
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ret = regmap_update_bits(chip->regmap, REG_ENABLE, |
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TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT, |
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state); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); |
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return ret; |
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} |
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return size; |
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} |
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static DEVICE_ATTR_WO(torch_pin); |
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static int lm3642_torch_brightness_set(struct led_classdev *cdev, |
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enum led_brightness brightness) |
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{ |
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struct lm3642_chip_data *chip = |
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container_of(cdev, struct lm3642_chip_data, cdev_torch); |
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int ret; |
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mutex_lock(&chip->lock); |
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chip->br_torch = brightness; |
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ret = lm3642_control(chip, chip->br_torch, MODES_TORCH); |
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mutex_unlock(&chip->lock); |
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return ret; |
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} |
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/* flash */ |
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/* strobe pin config for lm3642*/ |
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static ssize_t strobe_pin_store(struct device *dev, |
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struct device_attribute *attr, |
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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 lm3642_chip_data *chip = |
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container_of(led_cdev, struct lm3642_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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return ret; |
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if (state != 0) |
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state = 0x01 << STROBE_PIN_EN_SHIFT; |
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chip->strobe_pin = state; |
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ret = regmap_update_bits(chip->regmap, REG_ENABLE, |
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STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT, |
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state); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); |
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return ret; |
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} |
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return size; |
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} |
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static DEVICE_ATTR_WO(strobe_pin); |
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static int lm3642_strobe_brightness_set(struct led_classdev *cdev, |
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enum led_brightness brightness) |
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{ |
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struct lm3642_chip_data *chip = |
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container_of(cdev, struct lm3642_chip_data, cdev_flash); |
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int ret; |
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mutex_lock(&chip->lock); |
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chip->br_flash = brightness; |
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ret = lm3642_control(chip, chip->br_flash, MODES_FLASH); |
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mutex_unlock(&chip->lock); |
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return ret; |
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} |
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/* indicator */ |
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static int lm3642_indicator_brightness_set(struct led_classdev *cdev, |
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enum led_brightness brightness) |
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{ |
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struct lm3642_chip_data *chip = |
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container_of(cdev, struct lm3642_chip_data, cdev_indicator); |
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int ret; |
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mutex_lock(&chip->lock); |
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chip->br_indicator = brightness; |
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ret = lm3642_control(chip, chip->br_indicator, MODES_INDIC); |
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mutex_unlock(&chip->lock); |
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return ret; |
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} |
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static const struct regmap_config lm3642_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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static struct attribute *lm3642_flash_attrs[] = { |
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&dev_attr_strobe_pin.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(lm3642_flash); |
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static struct attribute *lm3642_torch_attrs[] = { |
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&dev_attr_torch_pin.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(lm3642_torch); |
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static int lm3642_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev); |
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struct lm3642_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 = devm_kzalloc(&client->dev, |
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sizeof(struct lm3642_chip_data), 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->tx_pin = pdata->tx_pin; |
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chip->torch_pin = pdata->torch_pin; |
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chip->strobe_pin = pdata->strobe_pin; |
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chip->regmap = devm_regmap_init_i2c(client, &lm3642_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 = lm3642_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_blocking = lm3642_strobe_brightness_set; |
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chip->cdev_flash.default_trigger = "flash"; |
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chip->cdev_flash.groups = lm3642_flash_groups, |
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err = led_classdev_register(&client->dev, &chip->cdev_flash); |
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if (err < 0) { |
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dev_err(chip->dev, "failed to register flash\n"); |
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goto err_out; |
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} |
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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_blocking = lm3642_torch_brightness_set; |
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chip->cdev_torch.default_trigger = "torch"; |
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chip->cdev_torch.groups = lm3642_torch_groups, |
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err = led_classdev_register(&client->dev, &chip->cdev_torch); |
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if (err < 0) { |
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dev_err(chip->dev, "failed to register torch\n"); |
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goto err_create_torch_file; |
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} |
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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_blocking = |
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lm3642_indicator_brightness_set; |
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err = led_classdev_register(&client->dev, &chip->cdev_indicator); |
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if (err < 0) { |
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dev_err(chip->dev, "failed to register indicator\n"); |
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goto err_create_indicator_file; |
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} |
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dev_info(&client->dev, "LM3642 is initialized\n"); |
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return 0; |
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err_create_indicator_file: |
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led_classdev_unregister(&chip->cdev_torch); |
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err_create_torch_file: |
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led_classdev_unregister(&chip->cdev_flash); |
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err_out: |
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return err; |
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} |
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static int lm3642_remove(struct i2c_client *client) |
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{ |
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struct lm3642_chip_data *chip = i2c_get_clientdata(client); |
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led_classdev_unregister(&chip->cdev_indicator); |
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led_classdev_unregister(&chip->cdev_torch); |
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led_classdev_unregister(&chip->cdev_flash); |
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regmap_write(chip->regmap, REG_ENABLE, 0); |
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return 0; |
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} |
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static const struct i2c_device_id lm3642_id[] = { |
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{LM3642_NAME, 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, lm3642_id); |
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static struct i2c_driver lm3642_i2c_driver = { |
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.driver = { |
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.name = LM3642_NAME, |
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.pm = NULL, |
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}, |
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.probe = lm3642_probe, |
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.remove = lm3642_remove, |
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.id_table = lm3642_id, |
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}; |
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module_i2c_driver(lm3642_i2c_driver); |
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MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642"); |
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MODULE_AUTHOR("Daniel Jeong <[email protected]>"); |
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MODULE_AUTHOR("G.Shark Jeong <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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