leds: Add new LED driver for lm3642 chips
This driver is a general version for LM642 led chip of TI. LM3642 : The LM3642 is a 4MHz fixed-frequency synchronous boost converter plus 1.5A constant current driver for a high-current white LED. The LM3642 is controlled via an I2C-compatible interface. Signed-off-by: G.Shark Jeong <gshark.jeong@gmail.com> Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
This commit is contained in:
G.Shark Jeong
Bryan Wu
parent
f162584232
commit
8b7cfbec05
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@ -63,6 +63,17 @@ config LEDS_LM3533
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hardware-accelerated blinking with maximum on and off periods of 9.8
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and 77 seconds respectively.
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config LEDS_LM3642
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tristate "LED support for LM3642 Chip"
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depends on LEDS_CLASS && I2C
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select REGMAP_I2C
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help
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This option enables support for LEDs connected to LM3642.
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The LM3642 is a 4MHz fixed-frequency synchronous boost
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converter plus 1.5A constant current driver for a high-current
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white LED.
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config LEDS_LOCOMO
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tristate "LED Support for Locomo device"
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depends on LEDS_CLASS
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@ -11,6 +11,7 @@ obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
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obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o
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obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o
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obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o
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obj-$(CONFIG_LEDS_LM3642) += leds-lm3642.o
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obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
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obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
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obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
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@ -0,0 +1,471 @@
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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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* 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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*/
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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/workqueue.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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struct work_struct work_flash;
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struct work_struct work_torch;
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struct work_struct work_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 __devinit lm3642_chip_init(struct lm3642_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 lm3642_platform_data *pdata = chip->pdata;
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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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goto out;
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reg_val &= (~EX_PIN_ENABLE_MASK);
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reg_val |= pdata->tx_pin;
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ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
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if (ret < 0)
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goto out;
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out:
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dev_err(chip->dev, "Failed to read 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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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 (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 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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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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out:
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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 lm3642_torch_pin_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 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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goto out_strtoint;
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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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goto out;
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return size;
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out:
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dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
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return size;
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out_strtoint:
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dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
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return size;
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}
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static DEVICE_ATTR(torch_pin, 0666, NULL, lm3642_torch_pin_store);
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static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
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{
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struct lm3642_chip_data *chip =
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container_of(work, struct lm3642_chip_data, work_torch);
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mutex_lock(&chip->lock);
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lm3642_control(chip, chip->br_torch, MODES_TORCH);
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mutex_unlock(&chip->lock);
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}
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static void 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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chip->br_torch = brightness;
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schedule_work(&chip->work_torch);
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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 lm3642_strobe_pin_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 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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goto out_strtoint;
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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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goto out;
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return size;
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out:
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dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
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return size;
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out_strtoint:
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dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
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return size;
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}
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static DEVICE_ATTR(strobe_pin, 0666, NULL, lm3642_strobe_pin_store);
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static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
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{
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struct lm3642_chip_data *chip =
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container_of(work, struct lm3642_chip_data, work_flash);
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mutex_lock(&chip->lock);
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lm3642_control(chip, chip->br_flash, MODES_FLASH);
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mutex_unlock(&chip->lock);
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}
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static void 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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chip->br_flash = brightness;
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schedule_work(&chip->work_flash);
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}
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/* indicator */
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static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
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{
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struct lm3642_chip_data *chip =
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container_of(work, struct lm3642_chip_data, work_indicator);
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mutex_lock(&chip->lock);
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lm3642_control(chip, chip->br_indicator, MODES_INDIC);
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mutex_unlock(&chip->lock);
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}
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static void 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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chip->br_indicator = brightness;
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schedule_work(&chip->work_indicator);
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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 int __devinit 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 = client->dev.platform_data;
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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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INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
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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 = lm3642_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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dev_err(chip->dev, "failed to register flash\n");
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goto err_out;
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}
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err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
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if (err < 0) {
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dev_err(chip->dev, "failed to create strobe-pin file\n");
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goto err_create_flash_pin_file;
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}
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/* torch */
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INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
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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 = lm3642_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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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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err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
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if (err < 0) {
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dev_err(chip->dev, "failed to create torch-pin file\n");
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goto err_create_torch_pin_file;
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}
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/* indicator */
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INIT_WORK(&chip->work_indicator,
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lm3642_deferred_indicator_brightness_set);
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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 = lm3642_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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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:
|
||||
device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
|
||||
err_create_torch_pin_file:
|
||||
led_classdev_unregister(&chip->cdev_torch);
|
||||
err_create_torch_file:
|
||||
device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
|
||||
err_create_flash_pin_file:
|
||||
led_classdev_unregister(&chip->cdev_flash);
|
||||
err_out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __devexit lm3642_remove(struct i2c_client *client)
|
||||
{
|
||||
struct lm3642_chip_data *chip = i2c_get_clientdata(client);
|
||||
|
||||
led_classdev_unregister(&chip->cdev_indicator);
|
||||
flush_work(&chip->work_indicator);
|
||||
device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
|
||||
led_classdev_unregister(&chip->cdev_torch);
|
||||
flush_work(&chip->work_torch);
|
||||
device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
|
||||
led_classdev_unregister(&chip->cdev_flash);
|
||||
flush_work(&chip->work_flash);
|
||||
regmap_write(chip->regmap, REG_ENABLE, 0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id lm3642_id[] = {
|
||||
{LM3642_NAME, 0},
|
||||
{}
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(i2c, lm3642_id);
|
||||
|
||||
static struct i2c_driver lm3642_i2c_driver = {
|
||||
.driver = {
|
||||
.name = LM3642_NAME,
|
||||
.owner = THIS_MODULE,
|
||||
.pm = NULL,
|
||||
},
|
||||
.probe = lm3642_probe,
|
||||
.remove = __devexit_p(lm3642_remove),
|
||||
.id_table = lm3642_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(lm3642_i2c_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
|
||||
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
|
||||
MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,38 @@
|
|||
/*
|
||||
* Copyright (C) 2012 Texas Instruments
|
||||
*
|
||||
* License Terms: GNU General Public License v2
|
||||
*
|
||||
* Simple driver for Texas Instruments LM3642 LED driver chip
|
||||
*
|
||||
* Author: G.Shark Jeong <gshark.jeong@gmail.com>
|
||||
* Daniel Jeong <daniel.jeong@ti.com>
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_LM3642_H
|
||||
#define __LINUX_LM3642_H
|
||||
|
||||
#define LM3642_NAME "leds-lm3642"
|
||||
|
||||
enum lm3642_torch_pin_enable {
|
||||
LM3642_TORCH_PIN_DISABLE = 0x00,
|
||||
LM3642_TORCH_PIN_ENABLE = 0x10,
|
||||
};
|
||||
|
||||
enum lm3642_strobe_pin_enable {
|
||||
LM3642_STROBE_PIN_DISABLE = 0x00,
|
||||
LM3642_STROBE_PIN_ENABLE = 0x20,
|
||||
};
|
||||
|
||||
enum lm3642_tx_pin_enable {
|
||||
LM3642_TX_PIN_DISABLE = 0x00,
|
||||
LM3642_TX_PIN_ENABLE = 0x40,
|
||||
};
|
||||
|
||||
struct lm3642_platform_data {
|
||||
enum lm3642_torch_pin_enable torch_pin;
|
||||
enum lm3642_strobe_pin_enable strobe_pin;
|
||||
enum lm3642_tx_pin_enable tx_pin;
|
||||
};
|
||||
|
||||
#endif /* __LINUX_LM3642_H */
|
||||
Loading…
Reference in New Issue