3 files changed, 483 insertions, 0 deletions

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index cf282763a8dc..b9008b54ac5d 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -352,6 +352,13 @@ config BACKLIGHT_AAT2870
           If you have a AnalogicTech AAT2870 say Y to enable the
           backlight driver.
 
+config BACKLIGHT_LM3630
+        tristate "Backlight Driver for LM3630"
+        depends on BACKLIGHT_CLASS_DEVICE && I2C
+        select REGMAP_I2C
+        help
+          This supports TI LM3630 Backlight Driver
+
 config BACKLIGHT_LP855X
         tristate "Backlight driver for TI LP855X"
         depends on BACKLIGHT_CLASS_DEVICE && I2C
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index a2ac9cfbaf6b..b0725313cd4d 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_BACKLIGHT_HP700)	+= jornada720_bl.o
 obj-$(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_LP855X)  += lp855x_bl.o
 obj-$(CONFIG_BACKLIGHT_OMAP1)   += omap1_bl.o
 obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o
diff --git a/drivers/video/backlight/lm3630_bl.c b/drivers/video/backlight/lm3630_bl.c
new file mode 100644
index 000000000000..dc191441796f
--- /dev/null
+++ b/drivers/video/backlight/lm3630_bl.c
@@ -0,0 +1,475 @@
+/*
+* Simple driver for Texas Instruments LM3630 Backlight 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/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/lm3630_bl.h>
+
+#define REG_CTRL        0x00
+#define REG_CONFIG      0x01
+#define REG_BRT_A       0x03
+#define REG_BRT_B       0x04
+#define REG_INT_STATUS  0x09
+#define REG_INT_EN      0x0A
+#define REG_FAULT       0x0B
+#define REG_PWM_OUTLOW  0x12
+#define REG_PWM_OUTHIGH 0x13
+#define REG_MAX         0x1F
+
+#define INT_DEBOUNCE_MSEC       10
+
+enum lm3630_leds {
+        BLED_ALL = 0,
+        BLED_1,
+        BLED_2
+};
+
+static const char *bled_name[] = {
+        [BLED_ALL] = "lm3630_bled",     /*Bank1 controls all string */
+        [BLED_1] = "lm3630_bled1",      /*Bank1 controls bled1 */
+        [BLED_2] = "lm3630_bled2",      /*Bank1 or 2 controls bled2 */
+};
+
+struct lm3630_chip_data {
+        struct device *dev;
+        struct delayed_work work;
+        int irq;
+        struct workqueue_struct *irqthread;
+        struct lm3630_platform_data *pdata;
+        struct backlight_device *bled1;
+        struct backlight_device *bled2;
+        struct regmap *regmap;
+};
+
+/* initialize chip */
+static int __devinit lm3630_chip_init(struct lm3630_chip_data *pchip)
+{
+        int ret;
+        unsigned int reg_val;
+        struct lm3630_platform_data *pdata = pchip->pdata;
+
+        /*pwm control */
+        reg_val = ((pdata->pwm_active & 0x01) << 2) | (pdata->pwm_ctrl & 0x03);
+        ret = regmap_update_bits(pchip->regmap, REG_CONFIG, 0x07, reg_val);
+        if (ret < 0)
+                goto out;
+
+        /* bank control */
+        reg_val = ((pdata->bank_b_ctrl & 0x01) << 1) |
+                        (pdata->bank_a_ctrl & 0x07);
+        ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x07, reg_val);
+        if (ret < 0)
+                goto out;
+
+        ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
+        if (ret < 0)
+                goto out;
+
+        /* set initial brightness */
+        if (pdata->bank_a_ctrl != BANK_A_CTRL_DISABLE) {
+                ret = regmap_write(pchip->regmap,
+                                   REG_BRT_A, pdata->init_brt_led1);
+                if (ret < 0)
+                        goto out;
+        }
+
+        if (pdata->bank_b_ctrl != BANK_B_CTRL_DISABLE) {
+                ret = regmap_write(pchip->regmap,
+                                   REG_BRT_B, pdata->init_brt_led2);
+                if (ret < 0)
+                        goto out;
+        }
+        return ret;
+
+out:
+        dev_err(pchip->dev, "i2c failed to access register\n");
+        return ret;
+}
+
+/* interrupt handling */
+static void lm3630_delayed_func(struct work_struct *work)
+{
+        int ret;
+        unsigned int reg_val;
+        struct lm3630_chip_data *pchip;
+
+        pchip = container_of(work, struct lm3630_chip_data, work.work);
+
+        ret = regmap_read(pchip->regmap, REG_INT_STATUS, &reg_val);
+        if (ret < 0) {
+                dev_err(pchip->dev,
+                        "i2c failed to access REG_INT_STATUS Register\n");
+                return;
+        }
+
+        dev_info(pchip->dev, "REG_INT_STATUS Register is 0x%x\n", reg_val);
+}
+
+static irqreturn_t lm3630_isr_func(int irq, void *chip)
+{
+        int ret;
+        struct lm3630_chip_data *pchip = chip;
+        unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC);
+
+        queue_delayed_work(pchip->irqthread, &pchip->work, delay);
+
+        ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
+        if (ret < 0)
+                goto out;
+
+        return IRQ_HANDLED;
+out:
+        dev_err(pchip->dev, "i2c failed to access register\n");
+        return IRQ_HANDLED;
+}
+
+static int lm3630_intr_config(struct lm3630_chip_data *pchip)
+{
+        INIT_DELAYED_WORK(&pchip->work, lm3630_delayed_func);
+        pchip->irqthread = create_singlethread_workqueue("lm3630-irqthd");
+        if (!pchip->irqthread) {
+                dev_err(pchip->dev, "create irq thread fail...\n");
+                return -1;
+        }
+        if (request_threaded_irq
+            (pchip->irq, NULL, lm3630_isr_func,
+             IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm3630_irq", pchip)) {
+                dev_err(pchip->dev, "request threaded irq fail..\n");
+                return -1;
+        }
+        return 0;
+}
+
+static bool
+set_intensity(struct backlight_device *bl, struct lm3630_chip_data *pchip)
+{
+        if (!pchip->pdata->pwm_set_intensity)
+                return false;
+        pchip->pdata->pwm_set_intensity(bl->props.brightness - 1,
+                                        pchip->pdata->pwm_period);
+        return true;
+}
+
+/* update and get brightness */
+static int lm3630_bank_a_update_status(struct backlight_device *bl)
+{
+        int ret;
+        struct lm3630_chip_data *pchip = bl_get_data(bl);
+        enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
+
+        /* brightness 0 means disable */
+        if (!bl->props.brightness) {
+                ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x04, 0x00);
+                if (ret < 0)
+                        goto out;
+                return bl->props.brightness;
+        }
+
+        /* pwm control */
+        if (pwm_ctrl == PWM_CTRL_BANK_A || pwm_ctrl == PWM_CTRL_BANK_ALL) {
+                if (!set_intensity(bl, pchip))
+                        dev_err(pchip->dev, "No pwm control func. in plat-data\n");
+        } else {
+
+                /* i2c control */
+                ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
+                if (ret < 0)
+                        goto out;
+                mdelay(1);
+                ret = regmap_write(pchip->regmap,
+                                   REG_BRT_A, bl->props.brightness - 1);
+                if (ret < 0)
+                        goto out;
+        }
+        return bl->props.brightness;
+out:
+        dev_err(pchip->dev, "i2c failed to access REG_CTRL\n");
+        return bl->props.brightness;
+}
+
+static int lm3630_bank_a_get_brightness(struct backlight_device *bl)
+{
+        unsigned int reg_val;
+        int brightness, ret;
+        struct lm3630_chip_data *pchip = bl_get_data(bl);
+        enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
+
+        if (pwm_ctrl == PWM_CTRL_BANK_A || pwm_ctrl == PWM_CTRL_BANK_ALL) {
+                ret = regmap_read(pchip->regmap, REG_PWM_OUTHIGH, &reg_val);
+                if (ret < 0)
+                        goto out;
+                brightness = reg_val & 0x01;
+                ret = regmap_read(pchip->regmap, REG_PWM_OUTLOW, &reg_val);
+                if (ret < 0)
+                        goto out;
+                brightness = ((brightness << 8) | reg_val) + 1;
+        } else {
+                ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
+                if (ret < 0)
+                        goto out;
+                mdelay(1);
+                ret = regmap_read(pchip->regmap, REG_BRT_A, &reg_val);
+                if (ret < 0)
+                        goto out;
+                brightness = reg_val + 1;
+        }
+        bl->props.brightness = brightness;
+        return bl->props.brightness;
+out:
+        dev_err(pchip->dev, "i2c failed to access register\n");
+        return 0;
+}
+
+static const struct backlight_ops lm3630_bank_a_ops = {
+        .options = BL_CORE_SUSPENDRESUME,
+        .update_status = lm3630_bank_a_update_status,
+        .get_brightness = lm3630_bank_a_get_brightness,
+};
+
+static int lm3630_bank_b_update_status(struct backlight_device *bl)
+{
+        int ret;
+        struct lm3630_chip_data *pchip = bl_get_data(bl);
+        enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
+
+        if (pwm_ctrl == PWM_CTRL_BANK_B || pwm_ctrl == PWM_CTRL_BANK_ALL) {
+                if (!set_intensity(bl, pchip))
+                        dev_err(pchip->dev,
+                                "no pwm control func. in plat-data\n");
+        } else {
+                ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
+                if (ret < 0)
+                        goto out;
+                mdelay(1);
+                ret = regmap_write(pchip->regmap,
+                                   REG_BRT_B, bl->props.brightness - 1);
+        }
+        return bl->props.brightness;
+out:
+        dev_err(pchip->dev, "i2c failed to access register\n");
+        return bl->props.brightness;
+}
+
+static int lm3630_bank_b_get_brightness(struct backlight_device *bl)
+{
+        unsigned int reg_val;
+        int brightness, ret;
+        struct lm3630_chip_data *pchip = bl_get_data(bl);
+        enum lm3630_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
+
+        if (pwm_ctrl == PWM_CTRL_BANK_B || pwm_ctrl == PWM_CTRL_BANK_ALL) {
+                ret = regmap_read(pchip->regmap, REG_PWM_OUTHIGH, &reg_val);
+                if (ret < 0)
+                        goto out;
+                brightness = reg_val & 0x01;
+                ret = regmap_read(pchip->regmap, REG_PWM_OUTLOW, &reg_val);
+                if (ret < 0)
+                        goto out;
+                brightness = ((brightness << 8) | reg_val) + 1;
+        } else {
+                ret = regmap_update_bits(pchip->regmap, REG_CTRL, 0x80, 0x00);
+                if (ret < 0)
+                        goto out;
+                mdelay(1);
+                ret = regmap_read(pchip->regmap, REG_BRT_B, &reg_val);
+                if (ret < 0)
+                        goto out;
+                brightness = reg_val + 1;
+        }
+        bl->props.brightness = brightness;
+
+        return bl->props.brightness;
+out:
+        dev_err(pchip->dev, "i2c failed to access register\n");
+        return bl->props.brightness;
+}
+
+static const struct backlight_ops lm3630_bank_b_ops = {
+        .options = BL_CORE_SUSPENDRESUME,
+        .update_status = lm3630_bank_b_update_status,
+        .get_brightness = lm3630_bank_b_get_brightness,
+};
+
+static int lm3630_backlight_register(struct lm3630_chip_data *pchip,
+                                     enum lm3630_leds ledno)
+{
+        const char *name = bled_name[ledno];
+        struct backlight_properties props;
+        struct lm3630_platform_data *pdata = pchip->pdata;
+
+        props.type = BACKLIGHT_RAW;
+        switch (ledno) {
+        case BLED_1:
+        case BLED_ALL:
+                props.brightness = pdata->init_brt_led1;
+                props.max_brightness = pdata->max_brt_led1;
+                pchip->bled1 =
+                    backlight_device_register(name, pchip->dev, pchip,
+                                              &lm3630_bank_a_ops, &props);
+                if (IS_ERR(pchip->bled1))
+                        return -EIO;
+                break;
+        case BLED_2:
+                props.brightness = pdata->init_brt_led2;
+                props.max_brightness = pdata->max_brt_led2;
+                pchip->bled2 =
+                    backlight_device_register(name, pchip->dev, pchip,
+                                              &lm3630_bank_b_ops, &props);
+                if (IS_ERR(pchip->bled2))
+                        return -EIO;
+                break;
+        }
+        return 0;
+}
+
+static void lm3630_backlight_unregister(struct lm3630_chip_data *pchip)
+{
+        if (pchip->bled1)
+                backlight_device_unregister(pchip->bled1);
+        if (pchip->bled2)
+                backlight_device_unregister(pchip->bled2);
+}
+
+static const struct regmap_config lm3630_regmap = {
+        .reg_bits = 8,
+        .val_bits = 8,
+        .max_register = REG_MAX,
+};
+
+static int __devinit lm3630_probe(struct i2c_client *client,
+                                  const struct i2c_device_id *id)
+{
+        struct lm3630_platform_data *pdata = client->dev.platform_data;
+        struct lm3630_chip_data *pchip;
+        int ret;
+
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+                dev_err(&client->dev, "fail : i2c functionality check...\n");
+                return -EOPNOTSUPP;
+        }
+
+        if (pdata == NULL) {
+                dev_err(&client->dev, "fail : no platform data.\n");
+                return -ENODATA;
+        }
+
+        pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630_chip_data),
+                             GFP_KERNEL);
+        if (!pchip)
+                return -ENOMEM;
+        pchip->pdata = pdata;
+        pchip->dev = &client->dev;
+
+        pchip->regmap = devm_regmap_init_i2c(client, &lm3630_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 = lm3630_chip_init(pchip);
+        if (ret < 0) {
+                dev_err(&client->dev, "fail : init chip\n");
+                goto err_chip_init;
+        }
+
+        switch (pdata->bank_a_ctrl) {
+        case BANK_A_CTRL_ALL:
+                ret = lm3630_backlight_register(pchip, BLED_ALL);
+                pdata->bank_b_ctrl = BANK_B_CTRL_DISABLE;
+                break;
+        case BANK_A_CTRL_LED1:
+                ret = lm3630_backlight_register(pchip, BLED_1);
+                break;
+        case BANK_A_CTRL_LED2:
+                ret = lm3630_backlight_register(pchip, BLED_2);
+                pdata->bank_b_ctrl = BANK_B_CTRL_DISABLE;
+                break;
+        default:
+                break;
+        }
+
+        if (ret < 0)
+                goto err_bl_reg;
+
+        if (pdata->bank_b_ctrl && pchip->bled2 == NULL) {
+                ret = lm3630_backlight_register(pchip, BLED_2);
+                if (ret < 0)
+                        goto err_bl_reg;
+        }
+
+        /* interrupt enable  : irq 0 is not allowed for lm3630 */
+        pchip->irq = client->irq;
+        if (pchip->irq)
+                lm3630_intr_config(pchip);
+
+        dev_info(&client->dev, "LM3630 backlight register OK.\n");
+        return 0;
+
+err_bl_reg:
+        dev_err(&client->dev, "fail : backlight register.\n");
+        lm3630_backlight_unregister(pchip);
+err_chip_init:
+        return ret;
+}
+
+static int __devexit lm3630_remove(struct i2c_client *client)
+{
+        int ret;
+        struct lm3630_chip_data *pchip = i2c_get_clientdata(client);
+
+        ret = regmap_write(pchip->regmap, REG_BRT_A, 0);
+        if (ret < 0)
+                dev_err(pchip->dev, "i2c failed to access register\n");
+
+        ret = regmap_write(pchip->regmap, REG_BRT_B, 0);
+        if (ret < 0)
+                dev_err(pchip->dev, "i2c failed to access register\n");
+
+        lm3630_backlight_unregister(pchip);
+        if (pchip->irq) {
+                free_irq(pchip->irq, pchip);
+                flush_workqueue(pchip->irqthread);
+                destroy_workqueue(pchip->irqthread);
+        }
+        return 0;
+}
+
+static const struct i2c_device_id lm3630_id[] = {
+        {LM3630_NAME, 0},
+        {}
+};
+
+MODULE_DEVICE_TABLE(i2c, lm3630_id);
+
+static struct i2c_driver lm3630_i2c_driver = {
+        .driver = {
+                   .name = LM3630_NAME,
+                   },
+        .probe = lm3630_probe,
+        .remove = __devexit_p(lm3630_remove),
+        .id_table = lm3630_id,
+};
+
+module_i2c_driver(lm3630_i2c_driver);
+
+MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630");
+MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
+MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
+MODULE_LICENSE("GPL v2");