--- /dev/null
+/*
+* 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
+};
+
+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 =
+ container_of(work, struct lm3630_chip_data, work.work);
+
+ ret = regmap_read(pchip->regmap, REG_INT_STATUS, ®_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;
+}
+
+/* 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 (pchip->pdata->pwm_set_intensity)
+ pchip->pdata->pwm_set_intensity(bl->props.brightness -
+ 1,
+ pchip->pdata->
+ pwm_period);
+ else
+ 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, ®_val);
+ if (ret < 0)
+ goto out;
+ brightness = reg_val & 0x01;
+ ret = regmap_read(pchip->regmap, REG_PWM_OUTLOW, ®_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, ®_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 (pchip->pdata->pwm_set_intensity)
+ pchip->pdata->pwm_set_intensity(bl->props.brightness -
+ 1,
+ pchip->pdata->
+ pwm_period);
+ else
+ 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, ®_val);
+ if (ret < 0)
+ goto out;
+ brightness = reg_val & 0x01;
+ ret = regmap_read(pchip->regmap, REG_PWM_OUTLOW, ®_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, ®_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");
projects / karo-tx-linux.git / commitdiff