This is a general driver for LM3509 backlgiht chip of TI.
LM3509 is High Efficiency Boost for White LED's and/or OLED Displays with Dual
Current Sinks. This driver supports OLED/White LED select, brightness control
sub/main conrtorl.
You can refer to the datasheet at http://www.ti.com/product/lm3509 for review.
Signed-off-by: Daniel Jeong <gshark.je...@gmail.com>
---
drivers/video/backlight/Kconfig | 7 +
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/lm3509_bl.c | 399 +++++++++++++++++++++++++++++++++++
3 files changed, 407 insertions(+)
create mode 100644 drivers/video/backlight/lm3509_bl.c
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 8d03924..9dc119e 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -366,6 +366,13 @@ config BACKLIGHT_AAT2870
If you have a AnalogicTech AAT2870 say Y to enable the
backlight driver.
+config BACKLIGHT_LM3509
+ tristate "Backlight Driver for LM3509"
+ depends on BACKLIGHT_CLASS_DEVICE && I2C
+ select REGMAP_I2C
+ help
+ This supports TI LM3509 Backlight Driver
+
config BACKLIGHT_LM3630A
tristate "Backlight Driver for LM3630A"
depends on BACKLIGHT_CLASS_DEVICE && I2C && PWM
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index fcd50b73..c34ed98 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_BACKLIGHT_GPIO) += gpio_backlight.o
obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o
obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO) += ipaq_micro_bl.o
+obj-$(CONFIG_BACKLIGHT_LM3509) += lm3509_bl.o
obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o
obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o
obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o
diff --git a/drivers/video/backlight/lm3509_bl.c
b/drivers/video/backlight/lm3509_bl.c
new file mode 100644
index 0000000..4f4fb85
--- /dev/null
+++ b/drivers/video/backlight/lm3509_bl.c
@@ -0,0 +1,399 @@
+/*
+ * Simple driver for Texas Instruments LM3509 Backlight driver chip
+ * Copyright (C) 2014 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/backlight.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#define LM3509_NAME "lm3509"
+
+#define REG_GP 0x10
+#define REG_BMAIN 0xa0
+#define REG_BSUB 0xb0
+#define REG_MAX 0xff
+
+#define LM3509_POR_BR_MAIN 0xe0
+#define LM3509_POR_BR_SUB 0xe0
+#define LM3509_MAX_BR 0xff
+
+enum lm3509_leds {
+ BLED_BMAIN = 0,
+ BLED_BSUB
+};
+
+struct lm3509_chip {
+ struct device *dev;
+ struct backlight_device *bmain;
+ struct backlight_device *bsub;
+ struct regmap *regmap;
+};
+
+/*
+ * enable main
+ * 0 : disables the main current sink and forces MAIN high impedence.
+ * 1 : enables the main current sink.
+ */
+static ssize_t lm3509_bmain_enable_store(struct device *dev,
+ struct device_attribute *devAttr,
+ const char *buf, size_t size)
+{
+ struct lm3509_chip *pchip = dev_get_drvdata(dev);
+ unsigned int state;
+ ssize_t ret;
+
+ ret = kstrtouint(buf, 10, &state);
+ if (ret) {
+ dev_err(pchip->dev, "input conversion fail\n");
+ return ret;
+ }
+
+ if (!state)
+ ret = regmap_update_bits(pchip->regmap, REG_GP, 0x1, 0x0);
+ else
+ ret = regmap_update_bits(pchip->regmap, REG_GP, 0x1, 0x1);
+ if (ret < 0) {
+ dev_err(pchip->dev, "i2c access fail to register\n");
+ return ret;
+ }
+
+ return size;
+}
+
+static DEVICE_ATTR(main_enable, S_IWUSR, NULL, lm3509_bmain_enable_store);
+
+/*
+ * OLED mode control
+ * 0 : white led mode - main and sub current sinks are active
+ * 1 : OLED mode - sub current sink is idabled
+ */
+static ssize_t lm3509_oled_mode_store(struct device *dev,
+ struct device_attribute *devAttr,
+ const char *buf, size_t size)
+{
+ struct lm3509_chip *pchip = dev_get_drvdata(dev);
+ unsigned int state;
+ ssize_t ret;
+
+ ret = kstrtouint(buf, 10, &state);
+ if (ret) {
+ dev_err(pchip->dev, "input conversion fail\n");
+ return ret;
+ }
+
+ if (!state)
+ ret = regmap_update_bits(pchip->regmap, REG_GP, 0x20, 0x00);
+ else
+ ret = regmap_update_bits(pchip->regmap, REG_GP, 0x20, 0x20);
+ if (ret < 0) {
+ dev_err(pchip->dev, "i2c access fail to register\n");
+ return ret;
+ }
+
+ return size;
+}
+
+static DEVICE_ATTR(oled_enable, S_IWUSR, NULL, lm3509_oled_mode_store);
+
+/*
+ * brightness rate of change
+ * set the rate of change of the LED current in to MAIN and SUB/FB
+ * in response to change in the contents of registers
+ * 0 - 51 us/step
+ * 1 - 13 ms/step
+ * 2 - 26 ms/step
+ * 3 - 52 ms/step
+ */
+static ssize_t lm3509_rate_store(struct device *dev,
+ struct device_attribute *devAttr,
+ const char *buf, size_t size)
+{
+ struct lm3509_chip *pchip = dev_get_drvdata(dev);
+ unsigned int state;
+ ssize_t ret;
+
+ ret = kstrtouint(buf, 10, &state);
+ if (ret) {
+ dev_err(pchip->dev, "input conversion fail\n");
+ return ret;
+ }
+
+ ret = regmap_update_bits(pchip->regmap, REG_GP, 0x18, state << 3);
+ if (ret < 0) {
+ dev_err(pchip->dev, "i2c access fail to register\n");
+ return ret;
+ }
+
+ return size;
+}
+
+static DEVICE_ATTR(rate, S_IWUSR, NULL, lm3509_rate_store);
+
+/* update and get brightness */
+static int lm3509_bmain_update_status(struct backlight_device *bl)
+{
+ struct lm3509_chip *pchip = bl_get_data(bl);
+ int ret;
+
+ ret = regmap_write(pchip->regmap, REG_BMAIN, bl->props.brightness);
+ if (ret < 0)
+ dev_err(pchip->dev, "i2c access fail to register\n");
+ return bl->props.brightness;
+}
+
+static int lm3509_bmain_get_brightness(struct backlight_device *bl)
+{
+ return bl->props.brightness;
+}
+
+static const struct backlight_ops lm3509_bmain_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .update_status = lm3509_bmain_update_status,
+ .get_brightness = lm3509_bmain_get_brightness,
+};
+
+/*
+ * enable sub
+ * 0 : disables the secondary current sink and forces SUB/FB high impedence.
+ * 1 : enables the secondary current sink.
+ */
+static ssize_t lm3509_bsub_enable_store(struct device *dev,
+ struct device_attribute *devAttr,
+ const char *buf, size_t size)
+{
+ struct lm3509_chip *pchip = dev_get_drvdata(dev);
+ unsigned int state;
+ ssize_t ret;
+
+ ret = kstrtouint(buf, 10, &state);
+ if (ret) {
+ dev_err(pchip->dev, "input conversion fail\n");
+ return ret;
+ }
+
+ if (!state)
+ ret = regmap_update_bits(pchip->regmap, REG_GP, 0x2, 0x0);
+ else
+ ret = regmap_update_bits(pchip->regmap, REG_GP, 0x2, 0x2);
+ if (ret < 0) {
+ dev_err(pchip->dev, "i2c access fail to register\n");
+ return ret;
+ }
+
+ return size;
+}
+
+static DEVICE_ATTR(sub_enable, S_IWUSR, NULL, lm3509_bsub_enable_store);
+
+/*
+ * uni mode select
+ * 0 : allows the current into MAIN and SUB/FB to be independently controlled
+ * via the bmain and bsub.
+ * 1 : disables the bsub register and causes the contents of bmain to set
+ * the current in both the MAIN and SUB/FB current sinks.
+ */
+static ssize_t lm3509_uni_mode_store(struct device *dev,
+ struct device_attribute *devAttr,
+ const char *buf, size_t size)
+{
+ struct lm3509_chip *pchip = dev_get_drvdata(dev);
+ unsigned int state;
+ ssize_t ret;
+
+ ret = kstrtouint(buf, 10, &state);
+ if (ret) {
+ dev_err(pchip->dev, "input conversion fail\n");
+ return ret;
+ }
+
+ if (!state)
+ ret = regmap_update_bits(pchip->regmap, REG_GP, 0x4, 0x0);
+ else
+ ret = regmap_update_bits(pchip->regmap, REG_GP, 0x4, 0x4);
+ if (ret < 0) {
+ dev_err(pchip->dev, "i2c access fail to register\n");
+ return ret;
+ }
+
+ return size;
+}
+
+static DEVICE_ATTR(uni_mode, S_IWUSR, NULL, lm3509_uni_mode_store);
+
+/* update and get brightness */
+static int lm3509_bsub_update_status(struct backlight_device *bl)
+{
+ struct lm3509_chip *pchip = bl_get_data(bl);
+ int ret;
+
+ ret = regmap_write(pchip->regmap, REG_BSUB, bl->props.brightness);
+ if (ret < 0)
+ dev_err(pchip->dev, "i2c access fail to register\n");
+ return bl->props.brightness;
+}
+
+static int lm3509_bsub_get_brightness(struct backlight_device *bl)
+{
+ return bl->props.brightness;
+}
+
+static const struct backlight_ops lm3509_bsub_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .update_status = lm3509_bsub_update_status,
+ .get_brightness = lm3509_bsub_get_brightness,
+};
+
+static int lm3509_backlight_register(struct lm3509_chip *pchip,
+ enum lm3509_leds ledno)
+{
+ struct backlight_properties props;
+
+ props.type = BACKLIGHT_RAW;
+ switch (ledno) {
+ case BLED_BMAIN:
+ props.brightness = LM3509_POR_BR_MAIN;
+ props.max_brightness = LM3509_MAX_BR;
+ pchip->bmain =
+ devm_backlight_device_register(pchip->dev, "bmain",
+ pchip->dev, pchip, &lm3509_bmain_ops, &props);
+ if (IS_ERR(pchip->bmain))
+ return -EIO;
+ break;
+ case BLED_BSUB:
+ props.brightness = LM3509_POR_BR_SUB;
+ props.max_brightness = LM3509_MAX_BR;
+ pchip->bsub =
+ devm_backlight_device_register(pchip->dev, "bsub",
+ pchip->dev, pchip, &lm3509_bsub_ops, &props);
+ if (IS_ERR(pchip->bsub))
+ return -EIO;
+ break;
+ default:
+ BUG();
+ }
+ return 0;
+}
+
+static const struct regmap_config lm3509_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = REG_MAX,
+};
+
+static int lm3509_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct lm3509_chip *pchip;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "fail : i2c functionality check\n");
+ return -EOPNOTSUPP;
+ }
+
+ pchip = devm_kzalloc(&client->dev, sizeof(struct lm3509_chip),
+ GFP_KERNEL);
+ if (!pchip)
+ return -ENOMEM;
+ pchip->dev = &client->dev;
+
+ pchip->regmap = devm_regmap_init_i2c(client, &lm3509_regmap);
+ if (IS_ERR(pchip->regmap)) {
+ dev_err(&client->dev, "fail : allocate register map\n");
+ ret = PTR_ERR(pchip->regmap);
+ return ret;
+ }
+ i2c_set_clientdata(client, pchip);
+
+ ret = lm3509_backlight_register(pchip, BLED_BMAIN);
+ if (ret < 0)
+ return ret;
+
+ ret = lm3509_backlight_register(pchip, BLED_BSUB);
+ if (ret < 0)
+ return ret;
+
+ ret = device_create_file(&(pchip->bmain->dev), &dev_attr_main_enable);
+ if (ret < 0)
+ return ret;
+
+ ret = device_create_file(&(pchip->bmain->dev), &dev_attr_oled_enable);
+ if (ret < 0)
+ goto err_oled_enable;
+
+ ret = device_create_file(&(pchip->bmain->dev), &dev_attr_rate);
+ if (ret < 0)
+ goto err_rate;
+
+ ret = device_create_file(&(pchip->bsub->dev), &dev_attr_sub_enable);
+ if (ret < 0)
+ goto err_sub_enable;
+
+ ret = device_create_file(&(pchip->bsub->dev), &dev_attr_uni_mode);
+ if (ret < 0)
+ goto err_uni_mode;
+
+ return 0;
+
+err_uni_mode:
+ device_remove_file(&(pchip->bsub->dev), &dev_attr_sub_enable);
+err_sub_enable:
+ device_remove_file(&(pchip->bmain->dev), &dev_attr_rate);
+err_rate:
+ device_remove_file(&(pchip->bmain->dev), &dev_attr_oled_enable);
+err_oled_enable:
+ device_remove_file(&(pchip->bmain->dev), &dev_attr_main_enable);
+ dev_err(pchip->dev, "failed : add sysfs entries\n");
+
+ return ret;
+}
+
+static int lm3509_remove(struct i2c_client *client)
+{
+ int ret;
+ struct lm3509_chip *pchip = i2c_get_clientdata(client);
+
+ device_remove_file(&(pchip->bsub->dev), &dev_attr_uni_mode);
+ device_remove_file(&(pchip->bsub->dev), &dev_attr_sub_enable);
+ device_remove_file(&(pchip->bmain->dev), &dev_attr_rate);
+ device_remove_file(&(pchip->bmain->dev), &dev_attr_oled_enable);
+ device_remove_file(&(pchip->bmain->dev), &dev_attr_main_enable);
+
+ ret = regmap_write(pchip->regmap, REG_GP, 0x0);
+ if (ret < 0)
+ dev_err(pchip->dev, "i2c failed to access register\n");
+
+ return 0;
+}
+
+static const struct i2c_device_id lm3509_id[] = {
+ {LM3509_NAME, 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, lm3509_id);
+
+static struct i2c_driver lm3509_i2c_driver = {
+ .driver = {
+ .name = LM3509_NAME,
+ },
+ .probe = lm3509_probe,
+ .remove = lm3509_remove,
+ .id_table = lm3509_id,
+};
+
+module_i2c_driver(lm3509_i2c_driver);
+
+MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3509");
+MODULE_AUTHOR("Daniel Jeong <gshark.je...@gmail.com>");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
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