backlight: add new lm3639 backlight driver
authorG.Shark Jeong <gshark.jeong@gmail.com>
Fri, 5 Oct 2012 00:12:55 +0000 (17:12 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 5 Oct 2012 18:04:53 +0000 (03:04 +0900)
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>
drivers/video/backlight/Kconfig
drivers/video/backlight/Makefile
drivers/video/backlight/lm3639_bl.c [new file with mode: 0644]
include/linux/platform_data/lm3639_bl.h [new file with mode: 0644]

index b9008b54ac5da125d4ca43ebac4b67c17d1a76f1..2b98fb8e711d4c33aa1ac8980f7a0afa2f12f2c7 100644 (file)
@@ -359,6 +359,15 @@ config BACKLIGHT_LM3630
        help
          This supports TI LM3630 Backlight Driver
 
+config BACKLIGHT_LM3639
+       tristate "Backlight Driver for LM3639"
+       depends on BACKLIGHT_CLASS_DEVICE && I2C
+       select REGMAP_I2C
+       select NEW_LEDS
+       select LEDS_CLASS
+       help
+         This supports TI LM3639 Backlight + 1.5A Flash LED Driver
+
 config BACKLIGHT_LP855X
        tristate "Backlight driver for TI LP855X"
        depends on BACKLIGHT_CLASS_DEVICE && I2C
index b0725313cd4d48c42c0ae879085dd225e8abfce1..a151378da45b20b038af64cc9d420bf7ef2c3248 100644 (file)
@@ -24,6 +24,7 @@ obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
 obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o
 obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
 obj-$(CONFIG_BACKLIGHT_LM3630) += lm3630_bl.o
+obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o
 obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o
 obj-$(CONFIG_BACKLIGHT_OMAP1)  += omap1_bl.o
 obj-$(CONFIG_BACKLIGHT_PANDORA)        += pandora_bl.o
diff --git a/drivers/video/backlight/lm3639_bl.c b/drivers/video/backlight/lm3639_bl.c
new file mode 100644 (file)
index 0000000..c6915c6
--- /dev/null
@@ -0,0 +1,437 @@
+/*
+* Simple driver for Texas Instruments LM3639 Backlight + Flash LED 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/slab.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/interrupt.h>
+#include <linux/regmap.h>
+#include <linux/platform_data/lm3639_bl.h>
+
+#define REG_DEV_ID     0x00
+#define REG_CHECKSUM   0x01
+#define REG_BL_CONF_1  0x02
+#define REG_BL_CONF_2  0x03
+#define REG_BL_CONF_3  0x04
+#define REG_BL_CONF_4  0x05
+#define REG_FL_CONF_1  0x06
+#define REG_FL_CONF_2  0x07
+#define REG_FL_CONF_3  0x08
+#define REG_IO_CTRL    0x09
+#define REG_ENABLE     0x0A
+#define REG_FLAG       0x0B
+#define REG_MAX                REG_FLAG
+
+struct lm3639_chip_data {
+       struct device *dev;
+       struct lm3639_platform_data *pdata;
+
+       struct backlight_device *bled;
+       struct led_classdev cdev_flash;
+       struct led_classdev cdev_torch;
+       struct regmap *regmap;
+
+       unsigned int bled_mode;
+       unsigned int bled_map;
+       unsigned int last_flag;
+};
+
+/* initialize chip */
+static int __devinit lm3639_chip_init(struct lm3639_chip_data *pchip)
+{
+       int ret;
+       unsigned int reg_val;
+       struct lm3639_platform_data *pdata = pchip->pdata;
+
+       /* input pins config. */
+       ret =
+           regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x08,
+                              pdata->pin_pwm);
+       if (ret < 0)
+               goto out;
+
+       reg_val = (pdata->pin_pwm & 0x40) | pdata->pin_strobe | pdata->pin_tx;
+       ret = regmap_update_bits(pchip->regmap, REG_IO_CTRL, 0x7C, reg_val);
+       if (ret < 0)
+               goto out;
+
+       /* init brightness */
+       ret = regmap_write(pchip->regmap, REG_BL_CONF_4, pdata->init_brt_led);
+       if (ret < 0)
+               goto out;
+
+       ret = regmap_write(pchip->regmap, REG_BL_CONF_3, pdata->init_brt_led);
+       if (ret < 0)
+               goto out;
+
+       /* output pins config. */
+       if (!pdata->init_brt_led)
+               reg_val = pdata->fled_pins | pdata->bled_pins;
+       else
+               reg_val = pdata->fled_pins | pdata->bled_pins | 0x01;
+
+       ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val);
+       if (ret < 0)
+               goto out;
+
+       return ret;
+out:
+       dev_err(pchip->dev, "i2c failed to access register\n");
+       return ret;
+}
+
+/* update and get brightness */
+static int lm3639_bled_update_status(struct backlight_device *bl)
+{
+       int ret;
+       unsigned int reg_val;
+       struct lm3639_chip_data *pchip = bl_get_data(bl);
+       struct lm3639_platform_data *pdata = pchip->pdata;
+
+       ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);
+       if (ret < 0)
+               goto out;
+
+       if (reg_val != 0)
+               dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
+
+       /* pwm control */
+       if (pdata->pin_pwm) {
+               if (pdata->pwm_set_intensity)
+                       pdata->pwm_set_intensity(bl->props.brightness,
+                                                pdata->max_brt_led);
+               else
+                       dev_err(pchip->dev,
+                               "No pwm control func. in plat-data\n");
+               return bl->props.brightness;
+       }
+
+       /* i2c control and set brigtness */
+       ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness);
+       if (ret < 0)
+               goto out;
+       ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness);
+       if (ret < 0)
+               goto out;
+
+       if (!bl->props.brightness)
+               ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00);
+       else
+               ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01);
+       if (ret < 0)
+               goto out;
+
+       return bl->props.brightness;
+out:
+       dev_err(pchip->dev, "i2c failed to access registers\n");
+       return bl->props.brightness;
+}
+
+static int lm3639_bled_get_brightness(struct backlight_device *bl)
+{
+       int ret;
+       unsigned int reg_val;
+       struct lm3639_chip_data *pchip = bl_get_data(bl);
+       struct lm3639_platform_data *pdata = pchip->pdata;
+
+       if (pdata->pin_pwm) {
+               if (pdata->pwm_get_intensity)
+                       bl->props.brightness = pdata->pwm_get_intensity();
+               else
+                       dev_err(pchip->dev,
+                               "No pwm control func. in plat-data\n");
+               return bl->props.brightness;
+       }
+
+       ret = regmap_read(pchip->regmap, REG_BL_CONF_1, &reg_val);
+       if (ret < 0)
+               goto out;
+       if (reg_val & 0x10)
+               ret = regmap_read(pchip->regmap, REG_BL_CONF_4, &reg_val);
+       else
+               ret = regmap_read(pchip->regmap, REG_BL_CONF_3, &reg_val);
+       if (ret < 0)
+               goto out;
+       bl->props.brightness = reg_val;
+
+       return bl->props.brightness;
+out:
+       dev_err(pchip->dev, "i2c failed to access register\n");
+       return bl->props.brightness;
+}
+
+static const struct backlight_ops lm3639_bled_ops = {
+       .options = BL_CORE_SUSPENDRESUME,
+       .update_status = lm3639_bled_update_status,
+       .get_brightness = lm3639_bled_get_brightness,
+};
+
+/* backlight mapping mode */
+static ssize_t lm3639_bled_mode_store(struct device *dev,
+                                     struct device_attribute *devAttr,
+                                     const char *buf, size_t size)
+{
+       ssize_t ret;
+       struct lm3639_chip_data *pchip = dev_get_drvdata(dev);
+       unsigned int state;
+
+       ret = kstrtouint(buf, 10, &state);
+       if (ret)
+               goto out_input;
+
+       if (!state)
+               ret =
+                   regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
+                                      0x00);
+       else
+               ret =
+                   regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
+                                      0x10);
+
+       if (ret < 0)
+               goto out;
+
+       return size;
+
+out:
+       dev_err(pchip->dev, "%s:i2c access fail to register\n", __func__);
+       return size;
+
+out_input:
+       dev_err(pchip->dev, "%s:input conversion fail\n", __func__);
+       return size;
+
+}
+
+static DEVICE_ATTR(bled_mode, 0666, NULL, lm3639_bled_mode_store);
+
+/* torch */
+static void lm3639_torch_brightness_set(struct led_classdev *cdev,
+                                       enum led_brightness brightness)
+{
+       int ret;
+       unsigned int reg_val;
+       struct lm3639_chip_data *pchip;
+
+       pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch);
+
+       ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);
+       if (ret < 0)
+               goto out;
+       if (reg_val != 0)
+               dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
+
+       /* brightness 0 means off state */
+       if (!brightness) {
+               ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
+               if (ret < 0)
+                       goto out;
+               return;
+       }
+
+       ret = regmap_update_bits(pchip->regmap,
+                                REG_FL_CONF_1, 0x70, (brightness - 1) << 4);
+       if (ret < 0)
+               goto out;
+       ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02);
+       if (ret < 0)
+               goto out;
+
+       return;
+out:
+       dev_err(pchip->dev, "i2c failed to access register\n");
+       return;
+}
+
+/* flash */
+static void lm3639_flash_brightness_set(struct led_classdev *cdev,
+                                       enum led_brightness brightness)
+{
+       int ret;
+       unsigned int reg_val;
+       struct lm3639_chip_data *pchip;
+
+       pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash);
+
+       ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);
+       if (ret < 0)
+               goto out;
+       if (reg_val != 0)
+               dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
+
+       /* torch off before flash control */
+       ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
+       if (ret < 0)
+               goto out;
+
+       /* brightness 0 means off state */
+       if (!brightness)
+               return;
+
+       ret = regmap_update_bits(pchip->regmap,
+                                REG_FL_CONF_1, 0x0F, brightness - 1);
+       if (ret < 0)
+               goto out;
+       ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06);
+       if (ret < 0)
+               goto out;
+
+       return;
+out:
+       dev_err(pchip->dev, "i2c failed to access register\n");
+       return;
+}
+
+static const struct regmap_config lm3639_regmap = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .max_register = REG_MAX,
+};
+
+static int __devinit lm3639_probe(struct i2c_client *client,
+                                 const struct i2c_device_id *id)
+{
+       int ret;
+       struct lm3639_chip_data *pchip;
+       struct lm3639_platform_data *pdata = client->dev.platform_data;
+       struct backlight_properties props;
+
+       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;
+       }
+
+       pchip = devm_kzalloc(&client->dev,
+                            sizeof(struct lm3639_chip_data), GFP_KERNEL);
+       if (!pchip)
+               return -ENOMEM;
+
+       pchip->pdata = pdata;
+       pchip->dev = &client->dev;
+
+       pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap);
+       if (IS_ERR(pchip->regmap)) {
+               ret = PTR_ERR(pchip->regmap);
+               dev_err(&client->dev, "fail : allocate register map: %d\n",
+                       ret);
+               return ret;
+       }
+       i2c_set_clientdata(client, pchip);
+
+       /* chip initialize */
+       ret = lm3639_chip_init(pchip);
+       if (ret < 0) {
+               dev_err(&client->dev, "fail : chip init\n");
+               goto err_out;
+       }
+
+       /* backlight */
+       props.type = BACKLIGHT_RAW;
+       props.brightness = pdata->init_brt_led;
+       props.max_brightness = pdata->max_brt_led;
+       pchip->bled =
+           backlight_device_register("lm3639_bled", pchip->dev, pchip,
+                                     &lm3639_bled_ops, &props);
+       if (IS_ERR(pchip->bled)) {
+               dev_err(&client->dev, "fail : backlight register\n");
+               ret = -EIO;
+               goto err_out;
+       }
+
+       ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode);
+       if (ret < 0) {
+               dev_err(&client->dev, "failed : add sysfs entries\n");
+               ret = -EIO;
+               goto err_bled_mode;
+       }
+
+       /* flash */
+       pchip->cdev_flash.name = "lm3639_flash";
+       pchip->cdev_flash.max_brightness = 16;
+       pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set;
+       ret = led_classdev_register((struct device *)
+                                   &client->dev, &pchip->cdev_flash);
+       if (ret < 0) {
+               dev_err(&client->dev, "fail : flash register\n");
+               ret = -EIO;
+               goto err_flash;
+       }
+
+       /* torch */
+       pchip->cdev_torch.name = "lm3639_torch";
+       pchip->cdev_torch.max_brightness = 8;
+       pchip->cdev_torch.brightness_set = lm3639_torch_brightness_set;
+       ret = led_classdev_register((struct device *)
+                                   &client->dev, &pchip->cdev_torch);
+       if (ret < 0) {
+               dev_err(&client->dev, "fail : torch register\n");
+               ret = -EIO;
+               goto err_torch;
+       }
+
+       return 0;
+
+err_torch:
+       led_classdev_unregister(&pchip->cdev_flash);
+err_flash:
+       device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
+err_bled_mode:
+       backlight_device_unregister(pchip->bled);
+err_out:
+       return ret;
+}
+
+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);
+
+       if (&pchip->cdev_torch)
+               led_classdev_unregister(&pchip->cdev_torch);
+       if (&pchip->cdev_flash)
+               led_classdev_unregister(&pchip->cdev_flash);
+       if (pchip->bled) {
+               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[] = {
+       {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");
diff --git a/include/linux/platform_data/lm3639_bl.h b/include/linux/platform_data/lm3639_bl.h
new file mode 100644 (file)
index 0000000..5234cd5
--- /dev/null
@@ -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 */