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Date: Fri, 14 Sep 2012 14:33:59 +0800
From: Bryan Wu <bryan.wu@...onical.com>
To: "G.Shark Jeong" <gshark.jeong@...il.com>
Cc: Richard Purdie <rpurdie@...ys.net>,
Daniel Jeong <daniel.jeong@...com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] leds: Add new LED driver for lm3642 chips
On Wed, Sep 12, 2012 at 8:05 PM, G.Shark Jeong <gshark.jeong@...il.com> wrote:
> From: "G.Shark Jeong" <gshark.jeong@...il.com>
>
> 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.
>
Thanks, this patch looks fine to me. Applied to my for-next branch.
-Bryan
> Signed-off-by: G.Shark Jeong <gshark.jeong@...il.com>
> ---
> drivers/leds/Kconfig | 11 +
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-lm3642.c | 471 +++++++++++++++++++++++++++++
> include/linux/platform_data/leds-lm3642.h | 38 +++
> 4 files changed, 521 insertions(+), 0 deletions(-)
> create mode 100644 drivers/leds/leds-lm3642.c
> create mode 100644 include/linux/platform_data/leds-lm3642.h
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index c96bbaa..bdc05cb 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -63,6 +63,17 @@ config LEDS_LM3533
> hardware-accelerated blinking with maximum on and off periods of 9.8
> and 77 seconds respectively.
>
> +config LEDS_LM3642
> + tristate "LED support for LM3642 Chip"
> + depends on LEDS_CLASS && I2C
> + select REGMAP_I2C
> + help
> + This option enables support for LEDs connected to LM3642.
> + The LM3642 is a 4MHz fixed-frequency synchronous boost
> + converter plus 1.5A constant current driver for a high-current
> + white LED.
> +
> +
> config LEDS_LOCOMO
> tristate "LED Support for Locomo device"
> depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index a4429a9..9a01111 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
> obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o
> obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o
> obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o
> +obj-$(CONFIG_LEDS_LM3642) += leds-lm3642.o
> obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
> obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
> obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
> diff --git a/drivers/leds/leds-lm3642.c b/drivers/leds/leds-lm3642.c
> new file mode 100644
> index 0000000..924853b
> --- /dev/null
> +++ b/drivers/leds/leds-lm3642.c
> @@ -0,0 +1,471 @@
> +/*
> +* Simple driver for Texas Instruments LM3642 LED Flash driver chip
> +* Copyright (C) 2012 Texas Instruments
> +*
> +* This program is free software; you can redistribute it and/or modify
> +* it under the terms of the GNU General Public License version 2 as
> +* published by the Free Software Foundation.
> +*
> +*/
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/leds.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#include <linux/fs.h>
> +#include <linux/regmap.h>
> +#include <linux/workqueue.h>
> +#include <linux/platform_data/leds-lm3642.h>
> +
> +#define REG_FILT_TIME (0x0)
> +#define REG_IVFM_MODE (0x1)
> +#define REG_TORCH_TIME (0x6)
> +#define REG_FLASH (0x8)
> +#define REG_I_CTRL (0x9)
> +#define REG_ENABLE (0xA)
> +#define REG_FLAG (0xB)
> +#define REG_MAX (0xB)
> +
> +#define UVLO_EN_SHIFT (7)
> +#define IVM_D_TH_SHIFT (2)
> +#define TORCH_RAMP_UP_TIME_SHIFT (3)
> +#define TORCH_RAMP_DN_TIME_SHIFT (0)
> +#define INDUCTOR_I_LIMIT_SHIFT (6)
> +#define FLASH_RAMP_TIME_SHIFT (3)
> +#define FLASH_TOUT_TIME_SHIFT (0)
> +#define TORCH_I_SHIFT (4)
> +#define FLASH_I_SHIFT (0)
> +#define IVFM_SHIFT (7)
> +#define TX_PIN_EN_SHIFT (6)
> +#define STROBE_PIN_EN_SHIFT (5)
> +#define TORCH_PIN_EN_SHIFT (4)
> +#define MODE_BITS_SHIFT (0)
> +
> +#define UVLO_EN_MASK (0x1)
> +#define IVM_D_TH_MASK (0x7)
> +#define TORCH_RAMP_UP_TIME_MASK (0x7)
> +#define TORCH_RAMP_DN_TIME_MASK (0x7)
> +#define INDUCTOR_I_LIMIT_MASK (0x1)
> +#define FLASH_RAMP_TIME_MASK (0x7)
> +#define FLASH_TOUT_TIME_MASK (0x7)
> +#define TORCH_I_MASK (0x7)
> +#define FLASH_I_MASK (0xF)
> +#define IVFM_MASK (0x1)
> +#define TX_PIN_EN_MASK (0x1)
> +#define STROBE_PIN_EN_MASK (0x1)
> +#define TORCH_PIN_EN_MASK (0x1)
> +#define MODE_BITS_MASK (0x73)
> +#define EX_PIN_CONTROL_MASK (0x71)
> +#define EX_PIN_ENABLE_MASK (0x70)
> +
> +enum lm3642_mode {
> + MODES_STASNDBY = 0,
> + MODES_INDIC,
> + MODES_TORCH,
> + MODES_FLASH
> +};
> +
> +struct lm3642_chip_data {
> + struct device *dev;
> +
> + struct led_classdev cdev_flash;
> + struct led_classdev cdev_torch;
> + struct led_classdev cdev_indicator;
> +
> + struct work_struct work_flash;
> + struct work_struct work_torch;
> + struct work_struct work_indicator;
> +
> + u8 br_flash;
> + u8 br_torch;
> + u8 br_indicator;
> +
> + enum lm3642_torch_pin_enable torch_pin;
> + enum lm3642_strobe_pin_enable strobe_pin;
> + enum lm3642_tx_pin_enable tx_pin;
> +
> + struct lm3642_platform_data *pdata;
> + struct regmap *regmap;
> + struct mutex lock;
> +
> + unsigned int last_flag;
> +};
> +
> +/* chip initialize */
> +static int __devinit lm3642_chip_init(struct lm3642_chip_data *chip)
> +{
> + unsigned int reg_val;
> + int ret;
> + struct lm3642_platform_data *pdata = chip->pdata;
> +
> + /* set enable register */
> + ret = regmap_read(chip->regmap, REG_ENABLE, ®_val);
> + if (ret < 0)
> + goto out;
> +
> + reg_val &= (~EX_PIN_ENABLE_MASK);
> + reg_val |= pdata->tx_pin;
> + ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
> + if (ret < 0)
> + goto out;
> +
> +out:
> + dev_err(chip->dev, "Failed to read REG_ENABLE Register\n");
> + return ret;
> +}
> +
> +/* chip control */
> +static int lm3642_control(struct lm3642_chip_data *chip,
> + u8 brightness, enum lm3642_mode opmode)
> +{
> + int ret;
> +
> + ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
> + if (ret < 0) {
> + dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
> + goto out;
> + }
> +
> + if (chip->last_flag)
> + dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
> +
> + /* brightness 0 means off-state */
> + if (!brightness)
> + opmode = MODES_STASNDBY;
> +
> + switch (opmode) {
> + case MODES_TORCH:
> + ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
> + TORCH_I_MASK << TORCH_I_SHIFT,
> + (brightness - 1) << TORCH_I_SHIFT);
> +
> + if (chip->torch_pin)
> + opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
> + break;
> +
> + case MODES_FLASH:
> + ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
> + FLASH_I_MASK << FLASH_I_SHIFT,
> + (brightness - 1) << FLASH_I_SHIFT);
> +
> + if (chip->strobe_pin)
> + opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
> + break;
> +
> + case MODES_INDIC:
> + ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
> + TORCH_I_MASK << TORCH_I_SHIFT,
> + (brightness - 1) << TORCH_I_SHIFT);
> + break;
> +
> + case MODES_STASNDBY:
> +
> + break;
> +
> + default:
> + return ret;
> + }
> + if (ret < 0) {
> + dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
> + goto out;
> + }
> +
> + if (chip->tx_pin)
> + opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);
> +
> + ret = regmap_update_bits(chip->regmap, REG_ENABLE,
> + MODE_BITS_MASK << MODE_BITS_SHIFT,
> + opmode << MODE_BITS_SHIFT);
> +out:
> + return ret;
> +}
> +
> +/* torch */
> +
> +/* torch pin config for lm3642*/
> +static ssize_t lm3642_torch_pin_store(struct device *dev,
> + struct device_attribute *devAttr,
> + const char *buf, size_t size)
> +{
> + ssize_t ret;
> + struct led_classdev *led_cdev = dev_get_drvdata(dev);
> + struct lm3642_chip_data *chip =
> + container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
> + unsigned int state;
> +
> + ret = kstrtouint(buf, 10, &state);
> + if (ret)
> + goto out_strtoint;
> + if (state != 0)
> + state = 0x01 << TORCH_PIN_EN_SHIFT;
> +
> + chip->torch_pin = state;
> + ret = regmap_update_bits(chip->regmap, REG_ENABLE,
> + TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
> + state);
> + if (ret < 0)
> + goto out;
> +
> + return size;
> +out:
> + dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
> + return size;
> +out_strtoint:
> + dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
> + return size;
> +}
> +
> +static DEVICE_ATTR(torch_pin, 0666, NULL, lm3642_torch_pin_store);
> +
> +static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
> +{
> + struct lm3642_chip_data *chip =
> + container_of(work, struct lm3642_chip_data, work_torch);
> +
> + mutex_lock(&chip->lock);
> + lm3642_control(chip, chip->br_torch, MODES_TORCH);
> + mutex_unlock(&chip->lock);
> +}
> +
> +static void lm3642_torch_brightness_set(struct led_classdev *cdev,
> + enum led_brightness brightness)
> +{
> + struct lm3642_chip_data *chip =
> + container_of(cdev, struct lm3642_chip_data, cdev_torch);
> +
> + chip->br_torch = brightness;
> + schedule_work(&chip->work_torch);
> +}
> +
> +/* flash */
> +
> +/* strobe pin config for lm3642*/
> +static ssize_t lm3642_strobe_pin_store(struct device *dev,
> + struct device_attribute *devAttr,
> + const char *buf, size_t size)
> +{
> + ssize_t ret;
> + struct led_classdev *led_cdev = dev_get_drvdata(dev);
> + struct lm3642_chip_data *chip =
> + container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
> + unsigned int state;
> +
> + ret = kstrtouint(buf, 10, &state);
> + if (ret)
> + goto out_strtoint;
> + if (state != 0)
> + state = 0x01 << STROBE_PIN_EN_SHIFT;
> +
> + chip->strobe_pin = state;
> + ret = regmap_update_bits(chip->regmap, REG_ENABLE,
> + STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
> + state);
> + if (ret < 0)
> + goto out;
> +
> + return size;
> +out:
> + dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
> + return size;
> +out_strtoint:
> + dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
> + return size;
> +}
> +
> +static DEVICE_ATTR(strobe_pin, 0666, NULL, lm3642_strobe_pin_store);
> +
> +static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
> +{
> + struct lm3642_chip_data *chip =
> + container_of(work, struct lm3642_chip_data, work_flash);
> +
> + mutex_lock(&chip->lock);
> + lm3642_control(chip, chip->br_flash, MODES_FLASH);
> + mutex_unlock(&chip->lock);
> +}
> +
> +static void lm3642_strobe_brightness_set(struct led_classdev *cdev,
> + enum led_brightness brightness)
> +{
> + struct lm3642_chip_data *chip =
> + container_of(cdev, struct lm3642_chip_data, cdev_flash);
> +
> + chip->br_flash = brightness;
> + schedule_work(&chip->work_flash);
> +}
> +
> +/* indicator */
> +static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
> +{
> + struct lm3642_chip_data *chip =
> + container_of(work, struct lm3642_chip_data, work_indicator);
> +
> + mutex_lock(&chip->lock);
> + lm3642_control(chip, chip->br_indicator, MODES_INDIC);
> + mutex_unlock(&chip->lock);
> +}
> +
> +static void lm3642_indicator_brightness_set(struct led_classdev *cdev,
> + enum led_brightness brightness)
> +{
> + struct lm3642_chip_data *chip =
> + container_of(cdev, struct lm3642_chip_data, cdev_indicator);
> +
> + chip->br_indicator = brightness;
> + schedule_work(&chip->work_indicator);
> +}
> +
> +static const struct regmap_config lm3642_regmap = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = REG_MAX,
> +};
> +
> +static int __devinit lm3642_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct lm3642_platform_data *pdata = client->dev.platform_data;
> + struct lm3642_chip_data *chip;
> +
> + int err;
> +
> + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> + dev_err(&client->dev, "i2c functionality check fail.\n");
> + return -EOPNOTSUPP;
> + }
> +
> + if (pdata == NULL) {
> + dev_err(&client->dev, "needs Platform Data.\n");
> + return -ENODATA;
> + }
> +
> + chip = devm_kzalloc(&client->dev,
> + sizeof(struct lm3642_chip_data), GFP_KERNEL);
> + if (!chip)
> + return -ENOMEM;
> +
> + chip->dev = &client->dev;
> + chip->pdata = pdata;
> +
> + chip->tx_pin = pdata->tx_pin;
> + chip->torch_pin = pdata->torch_pin;
> + chip->strobe_pin = pdata->strobe_pin;
> +
> + chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
> + if (IS_ERR(chip->regmap)) {
> + err = PTR_ERR(chip->regmap);
> + dev_err(&client->dev, "Failed to allocate register map: %d\n",
> + err);
> + return err;
> + }
> +
> + mutex_init(&chip->lock);
> + i2c_set_clientdata(client, chip);
> +
> + err = lm3642_chip_init(chip);
> + if (err < 0)
> + goto err_out;
> +
> + /* flash */
> + INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
> + chip->cdev_flash.name = "flash";
> + chip->cdev_flash.max_brightness = 16;
> + chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
> + err = led_classdev_register((struct device *)
> + &client->dev, &chip->cdev_flash);
> + if (err < 0) {
> + dev_err(chip->dev, "failed to register flash\n");
> + goto err_out;
> + }
> + err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
> + if (err < 0) {
> + dev_err(chip->dev, "failed to create strobe-pin file\n");
> + goto err_create_flash_pin_file;
> + }
> +
> + /* torch */
> + INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
> + chip->cdev_torch.name = "torch";
> + chip->cdev_torch.max_brightness = 8;
> + chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
> + err = led_classdev_register((struct device *)
> + &client->dev, &chip->cdev_torch);
> + if (err < 0) {
> + dev_err(chip->dev, "failed to register torch\n");
> + goto err_create_torch_file;
> + }
> + err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
> + if (err < 0) {
> + dev_err(chip->dev, "failed to create torch-pin file\n");
> + goto err_create_torch_pin_file;
> + }
> +
> + /* indicator */
> + INIT_WORK(&chip->work_indicator,
> + lm3642_deferred_indicator_brightness_set);
> + chip->cdev_indicator.name = "indicator";
> + chip->cdev_indicator.max_brightness = 8;
> + chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set;
> + err = led_classdev_register((struct device *)
> + &client->dev, &chip->cdev_indicator);
> + if (err < 0) {
> + dev_err(chip->dev, "failed to register indicator\n");
> + goto err_create_indicator_file;
> + }
> +
> + dev_info(&client->dev, "LM3642 is initialized\n");
> + return 0;
> +
> +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@...com>");
> +MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@...il.com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/platform_data/leds-lm3642.h b/include/linux/platform_data/leds-lm3642.h
> new file mode 100644
> index 0000000..72d6ee6
> --- /dev/null
> +++ b/include/linux/platform_data/leds-lm3642.h
> @@ -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@...il.com>
> +* Daniel Jeong <daniel.jeong@...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 */
> --
> 1.7.5.4
>
--
Bryan Wu <bryan.wu@...onical.com>
Kernel Developer +86.186-168-78255 Mobile
Canonical Ltd. www.canonical.com
Ubuntu - Linux for human beings | www.ubuntu.com
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