backlight: add new lm3639 backlight driver
This driver is a general version for LM3639 backlgiht + flash driver chip of TI. LM3639: The LM3639 is a single chip LCD Display Backlight driver + white LED Camera driver. Programming is done over an I2C compatible interface. www.ti.com [akpm@linux-foundation.org: code layout tweaks] Signed-off-by: G.Shark Jeong <gshark.jeong@gmail.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Daniel Jeong <daniel.jeong@ti.com> Cc: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
G.Shark Jeong
Linus Torvalds
Родитель
0c2a665a64
Коммит
0f59858d51
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@ -359,6 +359,15 @@ config BACKLIGHT_LM3630
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help
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This supports TI LM3630 Backlight Driver
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config BACKLIGHT_LM3639
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tristate "Backlight Driver for LM3639"
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depends on BACKLIGHT_CLASS_DEVICE && I2C
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select REGMAP_I2C
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select NEW_LEDS
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select LEDS_CLASS
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help
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This supports TI LM3639 Backlight + 1.5A Flash LED Driver
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config BACKLIGHT_LP855X
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tristate "Backlight driver for TI LP855X"
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depends on BACKLIGHT_CLASS_DEVICE && I2C
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@ -24,6 +24,7 @@ obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
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obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o
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obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
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obj-$(CONFIG_BACKLIGHT_LM3630) += lm3630_bl.o
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obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o
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obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o
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obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
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obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o
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@ -0,0 +1,437 @@
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/*
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* Simple driver for Texas Instruments LM3639 Backlight + Flash LED 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/slab.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/uaccess.h>
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#include <linux/interrupt.h>
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#include <linux/regmap.h>
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#include <linux/platform_data/lm3639_bl.h>
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#define REG_DEV_ID 0x00
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#define REG_CHECKSUM 0x01
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#define REG_BL_CONF_1 0x02
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#define REG_BL_CONF_2 0x03
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#define REG_BL_CONF_3 0x04
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#define REG_BL_CONF_4 0x05
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#define REG_FL_CONF_1 0x06
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#define REG_FL_CONF_2 0x07
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#define REG_FL_CONF_3 0x08
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#define REG_IO_CTRL 0x09
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#define REG_ENABLE 0x0A
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#define REG_FLAG 0x0B
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#define REG_MAX REG_FLAG
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struct lm3639_chip_data {
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struct device *dev;
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struct lm3639_platform_data *pdata;
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struct backlight_device *bled;
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struct led_classdev cdev_flash;
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struct led_classdev cdev_torch;
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struct regmap *regmap;
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unsigned int bled_mode;
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unsigned int bled_map;
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unsigned int last_flag;
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};
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/* initialize chip */
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static int __devinit lm3639_chip_init(struct lm3639_chip_data *pchip)
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{
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int ret;
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unsigned int reg_val;
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struct lm3639_platform_data *pdata = pchip->pdata;
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/* input pins config. */
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ret =
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regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x08,
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pdata->pin_pwm);
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if (ret < 0)
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goto out;
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reg_val = (pdata->pin_pwm & 0x40) | pdata->pin_strobe | pdata->pin_tx;
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ret = regmap_update_bits(pchip->regmap, REG_IO_CTRL, 0x7C, reg_val);
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if (ret < 0)
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goto out;
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/* init brightness */
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ret = regmap_write(pchip->regmap, REG_BL_CONF_4, pdata->init_brt_led);
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if (ret < 0)
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goto out;
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ret = regmap_write(pchip->regmap, REG_BL_CONF_3, pdata->init_brt_led);
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if (ret < 0)
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goto out;
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/* output pins config. */
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if (!pdata->init_brt_led)
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reg_val = pdata->fled_pins | pdata->bled_pins;
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else
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reg_val = pdata->fled_pins | pdata->bled_pins | 0x01;
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val);
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if (ret < 0)
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goto out;
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return ret;
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out:
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dev_err(pchip->dev, "i2c failed to access register\n");
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return ret;
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}
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/* update and get brightness */
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static int lm3639_bled_update_status(struct backlight_device *bl)
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{
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int ret;
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unsigned int reg_val;
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struct lm3639_chip_data *pchip = bl_get_data(bl);
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struct lm3639_platform_data *pdata = pchip->pdata;
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ret = regmap_read(pchip->regmap, REG_FLAG, ®_val);
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if (ret < 0)
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goto out;
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if (reg_val != 0)
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dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
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/* pwm control */
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if (pdata->pin_pwm) {
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if (pdata->pwm_set_intensity)
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pdata->pwm_set_intensity(bl->props.brightness,
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pdata->max_brt_led);
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else
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dev_err(pchip->dev,
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"No pwm control func. in plat-data\n");
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return bl->props.brightness;
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}
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/* i2c control and set brigtness */
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ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness);
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if (ret < 0)
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goto out;
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ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness);
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if (ret < 0)
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goto out;
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if (!bl->props.brightness)
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00);
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else
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01);
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if (ret < 0)
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goto out;
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return bl->props.brightness;
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out:
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dev_err(pchip->dev, "i2c failed to access registers\n");
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return bl->props.brightness;
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}
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static int lm3639_bled_get_brightness(struct backlight_device *bl)
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{
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int ret;
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unsigned int reg_val;
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struct lm3639_chip_data *pchip = bl_get_data(bl);
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struct lm3639_platform_data *pdata = pchip->pdata;
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if (pdata->pin_pwm) {
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if (pdata->pwm_get_intensity)
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bl->props.brightness = pdata->pwm_get_intensity();
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else
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dev_err(pchip->dev,
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"No pwm control func. in plat-data\n");
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return bl->props.brightness;
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}
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ret = regmap_read(pchip->regmap, REG_BL_CONF_1, ®_val);
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if (ret < 0)
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goto out;
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if (reg_val & 0x10)
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ret = regmap_read(pchip->regmap, REG_BL_CONF_4, ®_val);
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else
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ret = regmap_read(pchip->regmap, REG_BL_CONF_3, ®_val);
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if (ret < 0)
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goto out;
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bl->props.brightness = reg_val;
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return bl->props.brightness;
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out:
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dev_err(pchip->dev, "i2c failed to access register\n");
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return bl->props.brightness;
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}
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static const struct backlight_ops lm3639_bled_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = lm3639_bled_update_status,
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.get_brightness = lm3639_bled_get_brightness,
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};
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/* backlight mapping mode */
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static ssize_t lm3639_bled_mode_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 lm3639_chip_data *pchip = dev_get_drvdata(dev);
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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_input;
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if (!state)
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ret =
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regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
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0x00);
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else
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ret =
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regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
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0x10);
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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(pchip->dev, "%s:i2c access fail to register\n", __func__);
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return size;
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out_input:
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dev_err(pchip->dev, "%s:input conversion fail\n", __func__);
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return size;
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}
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static DEVICE_ATTR(bled_mode, 0666, NULL, lm3639_bled_mode_store);
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/* torch */
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static void lm3639_torch_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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int ret;
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unsigned int reg_val;
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struct lm3639_chip_data *pchip;
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pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch);
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ret = regmap_read(pchip->regmap, REG_FLAG, ®_val);
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if (ret < 0)
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goto out;
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if (reg_val != 0)
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dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
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/* brightness 0 means off state */
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if (!brightness) {
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
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if (ret < 0)
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goto out;
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return;
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}
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ret = regmap_update_bits(pchip->regmap,
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REG_FL_CONF_1, 0x70, (brightness - 1) << 4);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02);
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if (ret < 0)
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goto out;
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return;
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out:
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dev_err(pchip->dev, "i2c failed to access register\n");
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return;
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}
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/* flash */
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static void lm3639_flash_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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int ret;
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unsigned int reg_val;
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struct lm3639_chip_data *pchip;
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pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash);
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ret = regmap_read(pchip->regmap, REG_FLAG, ®_val);
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if (ret < 0)
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goto out;
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if (reg_val != 0)
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dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
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/* torch off before flash control */
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
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if (ret < 0)
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goto out;
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/* brightness 0 means off state */
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if (!brightness)
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return;
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ret = regmap_update_bits(pchip->regmap,
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REG_FL_CONF_1, 0x0F, brightness - 1);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06);
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if (ret < 0)
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goto out;
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return;
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out:
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dev_err(pchip->dev, "i2c failed to access register\n");
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return;
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}
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static const struct regmap_config lm3639_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 lm3639_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct lm3639_chip_data *pchip;
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struct lm3639_platform_data *pdata = client->dev.platform_data;
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struct backlight_properties props;
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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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pchip = devm_kzalloc(&client->dev,
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sizeof(struct lm3639_chip_data), GFP_KERNEL);
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if (!pchip)
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return -ENOMEM;
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pchip->pdata = pdata;
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pchip->dev = &client->dev;
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pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap);
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if (IS_ERR(pchip->regmap)) {
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ret = PTR_ERR(pchip->regmap);
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dev_err(&client->dev, "fail : allocate register map: %d\n",
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ret);
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return ret;
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}
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i2c_set_clientdata(client, pchip);
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/* chip initialize */
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ret = lm3639_chip_init(pchip);
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if (ret < 0) {
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dev_err(&client->dev, "fail : chip init\n");
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goto err_out;
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}
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/* backlight */
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props.type = BACKLIGHT_RAW;
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props.brightness = pdata->init_brt_led;
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props.max_brightness = pdata->max_brt_led;
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pchip->bled =
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backlight_device_register("lm3639_bled", pchip->dev, pchip,
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&lm3639_bled_ops, &props);
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if (IS_ERR(pchip->bled)) {
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dev_err(&client->dev, "fail : backlight register\n");
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ret = -EIO;
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goto err_out;
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}
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ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode);
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if (ret < 0) {
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dev_err(&client->dev, "failed : add sysfs entries\n");
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ret = -EIO;
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goto err_bled_mode;
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}
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/* flash */
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pchip->cdev_flash.name = "lm3639_flash";
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pchip->cdev_flash.max_brightness = 16;
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pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set;
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ret = led_classdev_register((struct device *)
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&client->dev, &pchip->cdev_flash);
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if (ret < 0) {
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dev_err(&client->dev, "fail : flash register\n");
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ret = -EIO;
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||||
goto err_flash;
|
||||
}
|
||||
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||||
/* torch */
|
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pchip->cdev_torch.name = "lm3639_torch";
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pchip->cdev_torch.max_brightness = 8;
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pchip->cdev_torch.brightness_set = lm3639_torch_brightness_set;
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||||
ret = led_classdev_register((struct device *)
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&client->dev, &pchip->cdev_torch);
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if (ret < 0) {
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dev_err(&client->dev, "fail : torch register\n");
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ret = -EIO;
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goto err_torch;
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}
|
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||||
return 0;
|
||||
|
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err_torch:
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||||
led_classdev_unregister(&pchip->cdev_flash);
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err_flash:
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device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
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err_bled_mode:
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||||
backlight_device_unregister(pchip->bled);
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err_out:
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return ret;
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}
|
||||
|
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static int __devexit lm3639_remove(struct i2c_client *client)
|
||||
{
|
||||
struct lm3639_chip_data *pchip = i2c_get_clientdata(client);
|
||||
|
||||
regmap_write(pchip->regmap, REG_ENABLE, 0x00);
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||||
|
||||
if (&pchip->cdev_torch)
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led_classdev_unregister(&pchip->cdev_torch);
|
||||
if (&pchip->cdev_flash)
|
||||
led_classdev_unregister(&pchip->cdev_flash);
|
||||
if (pchip->bled) {
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||||
device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
|
||||
backlight_device_unregister(pchip->bled);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id lm3639_id[] = {
|
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{LM3639_NAME, 0},
|
||||
{}
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(i2c, lm3639_id);
|
||||
static struct i2c_driver lm3639_i2c_driver = {
|
||||
.driver = {
|
||||
.name = LM3639_NAME,
|
||||
},
|
||||
.probe = lm3639_probe,
|
||||
.remove = __devexit_p(lm3639_remove),
|
||||
.id_table = lm3639_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(lm3639_i2c_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639");
|
||||
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
|
||||
MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,69 @@
|
|||
/*
|
||||
* Simple driver for Texas Instruments LM3630 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.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_LM3639_H
|
||||
#define __LINUX_LM3639_H
|
||||
|
||||
#define LM3639_NAME "lm3639_bl"
|
||||
|
||||
enum lm3639_pwm {
|
||||
LM3639_PWM_DISABLE = 0x00,
|
||||
LM3639_PWM_EN_ACTLOW = 0x48,
|
||||
LM3639_PWM_EN_ACTHIGH = 0x40,
|
||||
};
|
||||
|
||||
enum lm3639_strobe {
|
||||
LM3639_STROBE_DISABLE = 0x00,
|
||||
LM3639_STROBE_EN_ACTLOW = 0x10,
|
||||
LM3639_STROBE_EN_ACTHIGH = 0x30,
|
||||
};
|
||||
|
||||
enum lm3639_txpin {
|
||||
LM3639_TXPIN_DISABLE = 0x00,
|
||||
LM3639_TXPIN_EN_ACTLOW = 0x04,
|
||||
LM3639_TXPIN_EN_ACTHIGH = 0x0C,
|
||||
};
|
||||
|
||||
enum lm3639_fleds {
|
||||
LM3639_FLED_DIASBLE_ALL = 0x00,
|
||||
LM3639_FLED_EN_1 = 0x40,
|
||||
LM3639_FLED_EN_2 = 0x20,
|
||||
LM3639_FLED_EN_ALL = 0x60,
|
||||
};
|
||||
|
||||
enum lm3639_bleds {
|
||||
LM3639_BLED_DIASBLE_ALL = 0x00,
|
||||
LM3639_BLED_EN_1 = 0x10,
|
||||
LM3639_BLED_EN_2 = 0x08,
|
||||
LM3639_BLED_EN_ALL = 0x18,
|
||||
};
|
||||
enum lm3639_bled_mode {
|
||||
LM3639_BLED_MODE_EXPONETIAL = 0x00,
|
||||
LM3639_BLED_MODE_LINEAR = 0x10,
|
||||
};
|
||||
|
||||
struct lm3639_platform_data {
|
||||
unsigned int max_brt_led;
|
||||
unsigned int init_brt_led;
|
||||
|
||||
/* input pins */
|
||||
enum lm3639_pwm pin_pwm;
|
||||
enum lm3639_strobe pin_strobe;
|
||||
enum lm3639_txpin pin_tx;
|
||||
|
||||
/* output pins */
|
||||
enum lm3639_fleds fled_pins;
|
||||
enum lm3639_bleds bled_pins;
|
||||
enum lm3639_bled_mode bled_mode;
|
||||
|
||||
void (*pwm_set_intensity) (int brightness, int max_brightness);
|
||||
int (*pwm_get_intensity) (void);
|
||||
};
|
||||
#endif /* __LINUX_LM3639_H */
|
||||
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