[linux-2.6-block.git] / drivers / video / backlight / lm3630a_bl.c

// SPDX-License-Identifier: GPL-2.0-only
/*
* Simple driver for Texas Instruments LM3630A Backlight driver chip
* Copyright (C) 2012 Texas Instruments
*/
#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/gpio/consumer.h>
#include <linux/pwm.h>
#include <linux/platform_data/lm3630a_bl.h>

#define REG_CTRL	0x00
#define REG_BOOST	0x02
#define REG_CONFIG	0x01
#define REG_BRT_A	0x03
#define REG_BRT_B	0x04
#define REG_I_A		0x05
#define REG_I_B		0x06
#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_FILTER_STRENGTH	0x50
#define REG_MAX		0x50

#define INT_DEBOUNCE_MSEC	10

#define LM3630A_BANK_0		0
#define LM3630A_BANK_1		1

#define LM3630A_NUM_SINKS	2
#define LM3630A_SINK_0		0
#define LM3630A_SINK_1		1

struct lm3630a_chip {
	struct device *dev;
	struct delayed_work work;

	int irq;
	struct workqueue_struct *irqthread;
	struct lm3630a_platform_data *pdata;
	struct backlight_device *bleda;
	struct backlight_device *bledb;
	struct gpio_desc *enable_gpio;
	struct regmap *regmap;
	struct pwm_device *pwmd;
	struct pwm_state pwmd_state;
};

/* i2c access */
static int lm3630a_read(struct lm3630a_chip *pchip, unsigned int reg)
{
	int rval;
	unsigned int reg_val;

	rval = regmap_read(pchip->regmap, reg, &reg_val);
	if (rval < 0)
		return rval;
	return reg_val & 0xFF;
}

static int lm3630a_write(struct lm3630a_chip *pchip,
			 unsigned int reg, unsigned int data)
{
	return regmap_write(pchip->regmap, reg, data);
}

static int lm3630a_update(struct lm3630a_chip *pchip,
			  unsigned int reg, unsigned int mask,
			  unsigned int data)
{
	return regmap_update_bits(pchip->regmap, reg, mask, data);
}

/* initialize chip */
static int lm3630a_chip_init(struct lm3630a_chip *pchip)
{
	int rval;
	struct lm3630a_platform_data *pdata = pchip->pdata;

	usleep_range(1000, 2000);
	/* set Filter Strength Register */
	rval = lm3630a_write(pchip, REG_FILTER_STRENGTH, 0x03);
	/* set Cofig. register */
	rval |= lm3630a_update(pchip, REG_CONFIG, 0x07, pdata->pwm_ctrl);
	/* set boost control */
	rval |= lm3630a_write(pchip, REG_BOOST, 0x38);
	/* set current A */
	rval |= lm3630a_update(pchip, REG_I_A, 0x1F, 0x1F);
	/* set current B */
	rval |= lm3630a_write(pchip, REG_I_B, 0x1F);
	/* set control */
	rval |= lm3630a_update(pchip, REG_CTRL, 0x14, pdata->leda_ctrl);
	rval |= lm3630a_update(pchip, REG_CTRL, 0x0B, pdata->ledb_ctrl);
	usleep_range(1000, 2000);
	/* set brightness A and B */
	rval |= lm3630a_write(pchip, REG_BRT_A, pdata->leda_init_brt);
	rval |= lm3630a_write(pchip, REG_BRT_B, pdata->ledb_init_brt);

	if (rval < 0)
		dev_err(pchip->dev, "i2c failed to access register\n");
	return rval;
}

/* interrupt handling */
static void lm3630a_delayed_func(struct work_struct *work)
{
	int rval;
	struct lm3630a_chip *pchip;

	pchip = container_of(work, struct lm3630a_chip, work.work);

	rval = lm3630a_read(pchip, REG_INT_STATUS);
	if (rval < 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", rval);
}

static irqreturn_t lm3630a_isr_func(int irq, void *chip)
{
	int rval;
	struct lm3630a_chip *pchip = chip;
	unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC);

	queue_delayed_work(pchip->irqthread, &pchip->work, delay);

	rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	if (rval < 0) {
		dev_err(pchip->dev, "i2c failed to access register\n");
		return IRQ_NONE;
	}
	return IRQ_HANDLED;
}

static int lm3630a_intr_config(struct lm3630a_chip *pchip)
{
	int rval;

	rval = lm3630a_write(pchip, REG_INT_EN, 0x87);
	if (rval < 0)
		return rval;

	INIT_DELAYED_WORK(&pchip->work, lm3630a_delayed_func);
	pchip->irqthread = create_singlethread_workqueue("lm3630a-irqthd");
	if (!pchip->irqthread) {
		dev_err(pchip->dev, "create irq thread fail\n");
		return -ENOMEM;
	}
	if (request_threaded_irq
	    (pchip->irq, NULL, lm3630a_isr_func,
	     IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm3630a_irq", pchip)) {
		dev_err(pchip->dev, "request threaded irq fail\n");
		destroy_workqueue(pchip->irqthread);
		return -ENOMEM;
	}
	return rval;
}

static int lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
{
	int err;

	pchip->pwmd_state.period = pchip->pdata->pwm_period;

	err = pwm_set_relative_duty_cycle(&pchip->pwmd_state, br, br_max);
	if (err)
		return err;

	pchip->pwmd_state.enabled = pchip->pwmd_state.duty_cycle ? true : false;

	return pwm_apply_might_sleep(pchip->pwmd, &pchip->pwmd_state);
}

/* update and get brightness */
static int lm3630a_bank_a_update_status(struct backlight_device *bl)
{
	int ret;
	struct lm3630a_chip *pchip = bl_get_data(bl);
	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
	int brightness = backlight_get_brightness(bl);

	/* pwm control */
	if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0)
		return lm3630a_pwm_ctrl(pchip, brightness,
					bl->props.max_brightness);

	/* disable sleep */
	ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	if (ret < 0)
		goto out_i2c_err;
	usleep_range(1000, 2000);
	/* minimum brightness is 0x04 */
	ret = lm3630a_write(pchip, REG_BRT_A, brightness);

	if (brightness < 0x4)
		/* turn the string off  */
		ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDA_ENABLE, 0);
	else
		ret |= lm3630a_update(pchip, REG_CTRL,
				      LM3630A_LEDA_ENABLE, LM3630A_LEDA_ENABLE);
	if (ret < 0)
		goto out_i2c_err;
	return 0;

out_i2c_err:
	dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
	return ret;
}

static int lm3630a_bank_a_get_brightness(struct backlight_device *bl)
{
	int brightness, rval;
	struct lm3630a_chip *pchip = bl_get_data(bl);
	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;

	if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
		rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
		if (rval < 0)
			goto out_i2c_err;
		brightness = (rval & 0x01) << 8;
		rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
		if (rval < 0)
			goto out_i2c_err;
		brightness |= rval;
		return brightness;
	}

	/* disable sleep */
	rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	if (rval < 0)
		goto out_i2c_err;
	usleep_range(1000, 2000);
	rval = lm3630a_read(pchip, REG_BRT_A);
	if (rval < 0)
		goto out_i2c_err;
	return rval;

out_i2c_err:
	dev_err(pchip->dev, "i2c failed to access register\n");
	return 0;
}

static const struct backlight_ops lm3630a_bank_a_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.update_status = lm3630a_bank_a_update_status,
	.get_brightness = lm3630a_bank_a_get_brightness,
};

/* update and get brightness */
static int lm3630a_bank_b_update_status(struct backlight_device *bl)
{
	int ret;
	struct lm3630a_chip *pchip = bl_get_data(bl);
	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
	int brightness = backlight_get_brightness(bl);

	/* pwm control */
	if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0)
		return lm3630a_pwm_ctrl(pchip, brightness,
					bl->props.max_brightness);

	/* disable sleep */
	ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	if (ret < 0)
		goto out_i2c_err;
	usleep_range(1000, 2000);
	/* minimum brightness is 0x04 */
	ret = lm3630a_write(pchip, REG_BRT_B, brightness);

	if (brightness < 0x4)
		/* turn the string off  */
		ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDB_ENABLE, 0);
	else
		ret |= lm3630a_update(pchip, REG_CTRL,
				      LM3630A_LEDB_ENABLE, LM3630A_LEDB_ENABLE);
	if (ret < 0)
		goto out_i2c_err;
	return 0;

out_i2c_err:
	dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
	return ret;
}

static int lm3630a_bank_b_get_brightness(struct backlight_device *bl)
{
	int brightness, rval;
	struct lm3630a_chip *pchip = bl_get_data(bl);
	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;

	if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
		rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
		if (rval < 0)
			goto out_i2c_err;
		brightness = (rval & 0x01) << 8;
		rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
		if (rval < 0)
			goto out_i2c_err;
		brightness |= rval;
		return brightness;
	}

	/* disable sleep */
	rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	if (rval < 0)
		goto out_i2c_err;
	usleep_range(1000, 2000);
	rval = lm3630a_read(pchip, REG_BRT_B);
	if (rval < 0)
		goto out_i2c_err;
	return rval;

out_i2c_err:
	dev_err(pchip->dev, "i2c failed to access register\n");
	return 0;
}

static const struct backlight_ops lm3630a_bank_b_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.update_status = lm3630a_bank_b_update_status,
	.get_brightness = lm3630a_bank_b_get_brightness,
};

static int lm3630a_backlight_register(struct lm3630a_chip *pchip)
{
	struct lm3630a_platform_data *pdata = pchip->pdata;
	struct backlight_properties props;
	const char *label;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	if (pdata->leda_ctrl != LM3630A_LEDA_DISABLE) {
		props.brightness = pdata->leda_init_brt;
		props.max_brightness = pdata->leda_max_brt;
		label = pdata->leda_label ? pdata->leda_label : "lm3630a_leda";
		pchip->bleda =
		    devm_backlight_device_register(pchip->dev, label,
						   pchip->dev, pchip,
						   &lm3630a_bank_a_ops, &props);
		if (IS_ERR(pchip->bleda))
			return PTR_ERR(pchip->bleda);
	}

	if ((pdata->ledb_ctrl != LM3630A_LEDB_DISABLE) &&
	    (pdata->ledb_ctrl != LM3630A_LEDB_ON_A)) {
		props.brightness = pdata->ledb_init_brt;
		props.max_brightness = pdata->ledb_max_brt;
		label = pdata->ledb_label ? pdata->ledb_label : "lm3630a_ledb";
		pchip->bledb =
		    devm_backlight_device_register(pchip->dev, label,
						   pchip->dev, pchip,
						   &lm3630a_bank_b_ops, &props);
		if (IS_ERR(pchip->bledb))
			return PTR_ERR(pchip->bledb);
	}
	return 0;
}

static const struct regmap_config lm3630a_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = REG_MAX,
};

static int lm3630a_parse_led_sources(struct fwnode_handle *node,
				     int default_led_sources)
{
	u32 sources[LM3630A_NUM_SINKS];
	int ret, num_sources, i;

	num_sources = fwnode_property_count_u32(node, "led-sources");
	if (num_sources < 0)
		return default_led_sources;
	else if (num_sources > ARRAY_SIZE(sources))
		return -EINVAL;

	ret = fwnode_property_read_u32_array(node, "led-sources", sources,
					     num_sources);
	if (ret)
		return ret;

	for (i = 0; i < num_sources; i++) {
		if (sources[i] != LM3630A_SINK_0 && sources[i] != LM3630A_SINK_1)
			return -EINVAL;

		ret |= BIT(sources[i]);
	}

	return ret;
}

static int lm3630a_parse_bank(struct lm3630a_platform_data *pdata,
			      struct fwnode_handle *node, int *seen_led_sources)
{
	int led_sources, ret;
	const char *label;
	u32 bank, val;
	bool linear;

	ret = fwnode_property_read_u32(node, "reg", &bank);
	if (ret)
		return ret;

	if (bank != LM3630A_BANK_0 && bank != LM3630A_BANK_1)
		return -EINVAL;

	led_sources = lm3630a_parse_led_sources(node, BIT(bank));
	if (led_sources < 0)
		return led_sources;

	if (*seen_led_sources & led_sources)
		return -EINVAL;

	*seen_led_sources |= led_sources;

	linear = fwnode_property_read_bool(node,
					   "ti,linear-mapping-mode");
	if (bank) {
		if (led_sources & BIT(LM3630A_SINK_0) ||
		    !(led_sources & BIT(LM3630A_SINK_1)))
			return -EINVAL;

		pdata->ledb_ctrl = linear ?
			LM3630A_LEDB_ENABLE_LINEAR :
			LM3630A_LEDB_ENABLE;
	} else {
		if (!(led_sources & BIT(LM3630A_SINK_0)))
			return -EINVAL;

		pdata->leda_ctrl = linear ?
			LM3630A_LEDA_ENABLE_LINEAR :
			LM3630A_LEDA_ENABLE;

		if (led_sources & BIT(LM3630A_SINK_1))
			pdata->ledb_ctrl = LM3630A_LEDB_ON_A;
	}

	ret = fwnode_property_read_string(node, "label", &label);
	if (!ret) {
		if (bank)
			pdata->ledb_label = label;
		else
			pdata->leda_label = label;
	}

	ret = fwnode_property_read_u32(node, "default-brightness",
				       &val);
	if (!ret) {
		if (bank)
			pdata->ledb_init_brt = val;
		else
			pdata->leda_init_brt = val;
	}

	ret = fwnode_property_read_u32(node, "max-brightness", &val);
	if (!ret) {
		if (bank)
			pdata->ledb_max_brt = val;
		else
			pdata->leda_max_brt = val;
	}

	return 0;
}

static int lm3630a_parse_node(struct lm3630a_chip *pchip,
			      struct lm3630a_platform_data *pdata)
{
	int ret = -ENODEV, seen_led_sources = 0;
	struct fwnode_handle *node;

	device_for_each_child_node(pchip->dev, node) {
		ret = lm3630a_parse_bank(pdata, node, &seen_led_sources);
		if (ret) {
			fwnode_handle_put(node);
			return ret;
		}
	}

	return ret;
}

static int lm3630a_probe(struct i2c_client *client)
{
	struct lm3630a_platform_data *pdata = dev_get_platdata(&client->dev);
	struct lm3630a_chip *pchip;
	int rval;

	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 lm3630a_chip),
			     GFP_KERNEL);
	if (!pchip)
		return -ENOMEM;
	pchip->dev = &client->dev;

	pchip->regmap = devm_regmap_init_i2c(client, &lm3630a_regmap);
	if (IS_ERR(pchip->regmap)) {
		rval = PTR_ERR(pchip->regmap);
		dev_err(&client->dev, "fail : allocate reg. map: %d\n", rval);
		return rval;
	}

	i2c_set_clientdata(client, pchip);
	if (pdata == NULL) {
		pdata = devm_kzalloc(pchip->dev,
				     sizeof(struct lm3630a_platform_data),
				     GFP_KERNEL);
		if (pdata == NULL)
			return -ENOMEM;

		/* default values */
		pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
		pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
		pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
		pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;

		rval = lm3630a_parse_node(pchip, pdata);
		if (rval) {
			dev_err(&client->dev, "fail : parse node\n");
			return rval;
		}
	}
	pchip->pdata = pdata;

	pchip->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",
						GPIOD_OUT_HIGH);
	if (IS_ERR(pchip->enable_gpio))
		return PTR_ERR(pchip->enable_gpio);

	/* chip initialize */
	rval = lm3630a_chip_init(pchip);
	if (rval < 0) {
		dev_err(&client->dev, "fail : init chip\n");
		return rval;
	}
	/* backlight register */
	rval = lm3630a_backlight_register(pchip);
	if (rval < 0) {
		dev_err(&client->dev, "fail : backlight register.\n");
		return rval;
	}
	/* pwm */
	if (pdata->pwm_ctrl != LM3630A_PWM_DISABLE) {
		pchip->pwmd = devm_pwm_get(pchip->dev, "lm3630a-pwm");
		if (IS_ERR(pchip->pwmd))
			return dev_err_probe(&client->dev, PTR_ERR(pchip->pwmd),
					     "fail : get pwm device\n");

		pwm_init_state(pchip->pwmd, &pchip->pwmd_state);
	}

	/* interrupt enable  : irq 0 is not allowed */
	pchip->irq = client->irq;
	if (pchip->irq) {
		rval = lm3630a_intr_config(pchip);
		if (rval < 0)
			return rval;
	}
	dev_info(&client->dev, "LM3630A backlight register OK.\n");
	return 0;
}

static void lm3630a_remove(struct i2c_client *client)
{
	int rval;
	struct lm3630a_chip *pchip = i2c_get_clientdata(client);

	rval = lm3630a_write(pchip, REG_BRT_A, 0);
	if (rval < 0)
		dev_err(pchip->dev, "i2c failed to access register\n");

	rval = lm3630a_write(pchip, REG_BRT_B, 0);
	if (rval < 0)
		dev_err(pchip->dev, "i2c failed to access register\n");

	if (pchip->irq) {
		free_irq(pchip->irq, pchip);
		destroy_workqueue(pchip->irqthread);
	}
}

static const struct i2c_device_id lm3630a_id[] = {
	{ LM3630A_NAME },
	{}
};

MODULE_DEVICE_TABLE(i2c, lm3630a_id);

static const struct of_device_id lm3630a_match_table[] = {
	{ .compatible = "ti,lm3630a", },
	{ },
};

MODULE_DEVICE_TABLE(of, lm3630a_match_table);

static struct i2c_driver lm3630a_i2c_driver = {
	.driver = {
		   .name = LM3630A_NAME,
		   .of_match_table = lm3630a_match_table,
		   },
	.probe = lm3630a_probe,
	.remove = lm3630a_remove,
	.id_table = lm3630a_id,
};

module_i2c_driver(lm3630a_i2c_driver);

MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630A");
MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
MODULE_AUTHOR("LDD MLP <ldd-mlp@list.ti.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
28e64a68 DJ	2	/*
	3	* Simple driver for Texas Instruments LM3630A Backlight driver chip
	4	* Copyright (C) 2012 Texas Instruments
28e64a68 DJ	5	*/
	6	#include <linux/module.h>
	7	#include <linux/slab.h>
	8	#include <linux/i2c.h>
	9	#include <linux/backlight.h>
	10	#include <linux/err.h>
	11	#include <linux/delay.h>
	12	#include <linux/uaccess.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/regmap.h>
0e0e78e3	15	#include <linux/gpio/consumer.h>
28e64a68 DJ	16	#include <linux/pwm.h>
	17	#include <linux/platform_data/lm3630a_bl.h>
	18
	19	#define REG_CTRL 0x00
	20	#define REG_BOOST 0x02
	21	#define REG_CONFIG 0x01
	22	#define REG_BRT_A 0x03
	23	#define REG_BRT_B 0x04
	24	#define REG_I_A 0x05
	25	#define REG_I_B 0x06
	26	#define REG_INT_STATUS 0x09
	27	#define REG_INT_EN 0x0A
	28	#define REG_FAULT 0x0B
	29	#define REG_PWM_OUTLOW 0x12
	30	#define REG_PWM_OUTHIGH 0x13
06168a64 BS	31	#define REG_FILTER_STRENGTH 0x50
06168a64 BS	32	#define REG_MAX 0x50
28e64a68 DJ	33
28e64a68 DJ	34	#define INT_DEBOUNCE_MSEC 10
8fbce8ef BM	35
	36	#define LM3630A_BANK_0 0
	37	#define LM3630A_BANK_1 1
	38
	39	#define LM3630A_NUM_SINKS 2
	40	#define LM3630A_SINK_0 0
	41	#define LM3630A_SINK_1 1
	42
28e64a68 DJ	43	struct lm3630a_chip {
	44	struct device *dev;
	45	struct delayed_work work;
	46
	47	int irq;
	48	struct workqueue_struct *irqthread;
	49	struct lm3630a_platform_data *pdata;
	50	struct backlight_device *bleda;
	51	struct backlight_device *bledb;
0e0e78e3	52	struct gpio_desc *enable_gpio;
28e64a68 DJ	53	struct regmap *regmap;
28e64a68 DJ	54	struct pwm_device *pwmd;
1181f216	55	struct pwm_state pwmd_state;
28e64a68 DJ	56	};
	57
	58	/* i2c access */
	59	static int lm3630a_read(struct lm3630a_chip *pchip, unsigned int reg)
	60	{
	61	int rval;
	62	unsigned int reg_val;
	63
	64	rval = regmap_read(pchip->regmap, reg, &reg_val);
	65	if (rval < 0)
	66	return rval;
	67	return reg_val & 0xFF;
	68	}
	69
	70	static int lm3630a_write(struct lm3630a_chip *pchip,
	71	unsigned int reg, unsigned int data)
	72	{
	73	return regmap_write(pchip->regmap, reg, data);
	74	}
	75
	76	static int lm3630a_update(struct lm3630a_chip *pchip,
	77	unsigned int reg, unsigned int mask,
	78	unsigned int data)
	79	{
	80	return regmap_update_bits(pchip->regmap, reg, mask, data);
	81	}
	82
	83	/* initialize chip */
	84	static int lm3630a_chip_init(struct lm3630a_chip *pchip)
	85	{
	86	int rval;
	87	struct lm3630a_platform_data *pdata = pchip->pdata;
	88
	89	usleep_range(1000, 2000);
	90	/* set Filter Strength Register */
06168a64	91	rval = lm3630a_write(pchip, REG_FILTER_STRENGTH, 0x03);
28e64a68 DJ	92	/* set Cofig. register */
	93	rval \|= lm3630a_update(pchip, REG_CONFIG, 0x07, pdata->pwm_ctrl);
	94	/* set boost control */
	95	rval \|= lm3630a_write(pchip, REG_BOOST, 0x38);
	96	/* set current A */
	97	rval \|= lm3630a_update(pchip, REG_I_A, 0x1F, 0x1F);
	98	/* set current B */
	99	rval \|= lm3630a_write(pchip, REG_I_B, 0x1F);
	100	/* set control */
4c4d2a3a DJ	101	rval \|= lm3630a_update(pchip, REG_CTRL, 0x14, pdata->leda_ctrl);
4c4d2a3a DJ	102	rval \|= lm3630a_update(pchip, REG_CTRL, 0x0B, pdata->ledb_ctrl);
28e64a68 DJ	103	usleep_range(1000, 2000);
	104	/* set brightness A and B */
	105	rval \|= lm3630a_write(pchip, REG_BRT_A, pdata->leda_init_brt);
	106	rval \|= lm3630a_write(pchip, REG_BRT_B, pdata->ledb_init_brt);
	107
	108	if (rval < 0)
	109	dev_err(pchip->dev, "i2c failed to access register\n");
	110	return rval;
	111	}
	112
	113	/* interrupt handling */
	114	static void lm3630a_delayed_func(struct work_struct *work)
	115	{
2a0c316b	116	int rval;
28e64a68 DJ	117	struct lm3630a_chip *pchip;
	118
	119	pchip = container_of(work, struct lm3630a_chip, work.work);
	120
	121	rval = lm3630a_read(pchip, REG_INT_STATUS);
	122	if (rval < 0) {
	123	dev_err(pchip->dev,
	124	"i2c failed to access REG_INT_STATUS Register\n");
	125	return;
	126	}
	127
	128	dev_info(pchip->dev, "REG_INT_STATUS Register is 0x%x\n", rval);
	129	}
	130
	131	static irqreturn_t lm3630a_isr_func(int irq, void *chip)
	132	{
	133	int rval;
	134	struct lm3630a_chip *pchip = chip;
	135	unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC);
	136
	137	queue_delayed_work(pchip->irqthread, &pchip->work, delay);
	138
	139	rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	140	if (rval < 0) {
	141	dev_err(pchip->dev, "i2c failed to access register\n");
	142	return IRQ_NONE;
	143	}
	144	return IRQ_HANDLED;
	145	}
	146
	147	static int lm3630a_intr_config(struct lm3630a_chip *pchip)
	148	{
	149	int rval;
	150
	151	rval = lm3630a_write(pchip, REG_INT_EN, 0x87);
	152	if (rval < 0)
	153	return rval;
	154
	155	INIT_DELAYED_WORK(&pchip->work, lm3630a_delayed_func);
	156	pchip->irqthread = create_singlethread_workqueue("lm3630a-irqthd");
	157	if (!pchip->irqthread) {
	158	dev_err(pchip->dev, "create irq thread fail\n");
	159	return -ENOMEM;
	160	}
	161	if (request_threaded_irq
	162	(pchip->irq, NULL, lm3630a_isr_func,
	163	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT, "lm3630a_irq", pchip)) {
	164	dev_err(pchip->dev, "request threaded irq fail\n");
bcd5b416	165	destroy_workqueue(pchip->irqthread);
28e64a68 DJ	166	return -ENOMEM;
	167	}
	168	return rval;
	169	}
	170
1181f216	171	static int lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
28e64a68	172	{
1181f216	173	int err;
28e64a68	174
1181f216 UKK	175	pchip->pwmd_state.period = pchip->pdata->pwm_period;
	176
	177	err = pwm_set_relative_duty_cycle(&pchip->pwmd_state, br, br_max);
	178	if (err)
	179	return err;
	180
	181	pchip->pwmd_state.enabled = pchip->pwmd_state.duty_cycle ? true : false;
	182
c748a6d7	183	return pwm_apply_might_sleep(pchip->pwmd, &pchip->pwmd_state);
28e64a68 DJ	184	}
	185
	186	/* update and get brightness */
	187	static int lm3630a_bank_a_update_status(struct backlight_device *bl)
	188	{
	189	int ret;
	190	struct lm3630a_chip *pchip = bl_get_data(bl);
	191	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
dc0ba74e	192	int brightness = backlight_get_brightness(bl);
28e64a68 DJ	193
28e64a68 DJ	194	/* pwm control */
1181f216	195	if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0)
dc0ba74e	196	return lm3630a_pwm_ctrl(pchip, brightness,
1181f216	197	bl->props.max_brightness);
28e64a68 DJ	198
	199	/* disable sleep */
	200	ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	201	if (ret < 0)
	202	goto out_i2c_err;
	203	usleep_range(1000, 2000);
	204	/* minimum brightness is 0x04 */
dc0ba74e	205	ret = lm3630a_write(pchip, REG_BRT_A, brightness);
ae9c4808	206
dc0ba74e	207	if (brightness < 0x4)
ae9c4808	208	/* turn the string off */
28e64a68 DJ	209	ret \|= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDA_ENABLE, 0);
	210	else
	211	ret \|= lm3630a_update(pchip, REG_CTRL,
	212	LM3630A_LEDA_ENABLE, LM3630A_LEDA_ENABLE);
	213	if (ret < 0)
	214	goto out_i2c_err;
d3f48ec0	215	return 0;
28e64a68 DJ	216
28e64a68 DJ	217	out_i2c_err:
b9481a66 UKK	218	dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
b9481a66 UKK	219	return ret;
28e64a68 DJ	220	}
	221
	222	static int lm3630a_bank_a_get_brightness(struct backlight_device *bl)
	223	{
	224	int brightness, rval;
	225	struct lm3630a_chip *pchip = bl_get_data(bl);
	226	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
	227
	228	if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
	229	rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
	230	if (rval < 0)
	231	goto out_i2c_err;
	232	brightness = (rval & 0x01) << 8;
	233	rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
	234	if (rval < 0)
	235	goto out_i2c_err;
	236	brightness \|= rval;
4bf7ddd2	237	return brightness;
28e64a68 DJ	238	}
	239
	240	/* disable sleep */
	241	rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	242	if (rval < 0)
	243	goto out_i2c_err;
	244	usleep_range(1000, 2000);
	245	rval = lm3630a_read(pchip, REG_BRT_A);
	246	if (rval < 0)
	247	goto out_i2c_err;
4bf7ddd2	248	return rval;
28e64a68	249
28e64a68 DJ	250	out_i2c_err:
	251	dev_err(pchip->dev, "i2c failed to access register\n");
	252	return 0;
	253	}
	254
	255	static const struct backlight_ops lm3630a_bank_a_ops = {
	256	.options = BL_CORE_SUSPENDRESUME,
	257	.update_status = lm3630a_bank_a_update_status,
	258	.get_brightness = lm3630a_bank_a_get_brightness,
	259	};
	260
	261	/* update and get brightness */
	262	static int lm3630a_bank_b_update_status(struct backlight_device *bl)
	263	{
	264	int ret;
	265	struct lm3630a_chip *pchip = bl_get_data(bl);
	266	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
dc0ba74e	267	int brightness = backlight_get_brightness(bl);
28e64a68 DJ	268
28e64a68 DJ	269	/* pwm control */
1181f216	270	if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0)
dc0ba74e	271	return lm3630a_pwm_ctrl(pchip, brightness,
1181f216	272	bl->props.max_brightness);
28e64a68 DJ	273
	274	/* disable sleep */
	275	ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	276	if (ret < 0)
	277	goto out_i2c_err;
	278	usleep_range(1000, 2000);
	279	/* minimum brightness is 0x04 */
dc0ba74e	280	ret = lm3630a_write(pchip, REG_BRT_B, brightness);
ae9c4808	281
dc0ba74e	282	if (brightness < 0x4)
ae9c4808	283	/* turn the string off */
28e64a68 DJ	284	ret \|= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDB_ENABLE, 0);
	285	else
	286	ret \|= lm3630a_update(pchip, REG_CTRL,
	287	LM3630A_LEDB_ENABLE, LM3630A_LEDB_ENABLE);
	288	if (ret < 0)
	289	goto out_i2c_err;
d3f48ec0	290	return 0;
28e64a68 DJ	291
28e64a68 DJ	292	out_i2c_err:
b9481a66 UKK	293	dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
b9481a66 UKK	294	return ret;
28e64a68 DJ	295	}
	296
	297	static int lm3630a_bank_b_get_brightness(struct backlight_device *bl)
	298	{
	299	int brightness, rval;
	300	struct lm3630a_chip *pchip = bl_get_data(bl);
	301	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
	302
	303	if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
	304	rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
	305	if (rval < 0)
	306	goto out_i2c_err;
	307	brightness = (rval & 0x01) << 8;
	308	rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
	309	if (rval < 0)
	310	goto out_i2c_err;
	311	brightness \|= rval;
4bf7ddd2	312	return brightness;
28e64a68 DJ	313	}
	314
	315	/* disable sleep */
	316	rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	317	if (rval < 0)
	318	goto out_i2c_err;
	319	usleep_range(1000, 2000);
	320	rval = lm3630a_read(pchip, REG_BRT_B);
	321	if (rval < 0)
	322	goto out_i2c_err;
4bf7ddd2	323	return rval;
28e64a68	324
28e64a68 DJ	325	out_i2c_err:
	326	dev_err(pchip->dev, "i2c failed to access register\n");
	327	return 0;
	328	}
	329
	330	static const struct backlight_ops lm3630a_bank_b_ops = {
	331	.options = BL_CORE_SUSPENDRESUME,
	332	.update_status = lm3630a_bank_b_update_status,
	333	.get_brightness = lm3630a_bank_b_get_brightness,
	334	};
	335
	336	static int lm3630a_backlight_register(struct lm3630a_chip *pchip)
	337	{
28e64a68	338	struct lm3630a_platform_data *pdata = pchip->pdata;
8fbce8ef BM	339	struct backlight_properties props;
8fbce8ef BM	340	const char *label;
28e64a68	341
ad9aeb0e	342	memset(&props, 0, sizeof(struct backlight_properties));
28e64a68 DJ	343	props.type = BACKLIGHT_RAW;
	344	if (pdata->leda_ctrl != LM3630A_LEDA_DISABLE) {
	345	props.brightness = pdata->leda_init_brt;
	346	props.max_brightness = pdata->leda_max_brt;
8fbce8ef	347	label = pdata->leda_label ? pdata->leda_label : "lm3630a_leda";
28e64a68	348	pchip->bleda =
8fbce8ef	349	devm_backlight_device_register(pchip->dev, label,
28e64a68 DJ	350	pchip->dev, pchip,
	351	&lm3630a_bank_a_ops, &props);
	352	if (IS_ERR(pchip->bleda))
	353	return PTR_ERR(pchip->bleda);
	354	}
	355
	356	if ((pdata->ledb_ctrl != LM3630A_LEDB_DISABLE) &&
	357	(pdata->ledb_ctrl != LM3630A_LEDB_ON_A)) {
	358	props.brightness = pdata->ledb_init_brt;
	359	props.max_brightness = pdata->ledb_max_brt;
8fbce8ef	360	label = pdata->ledb_label ? pdata->ledb_label : "lm3630a_ledb";
28e64a68	361	pchip->bledb =
8fbce8ef	362	devm_backlight_device_register(pchip->dev, label,
28e64a68 DJ	363	pchip->dev, pchip,
	364	&lm3630a_bank_b_ops, &props);
	365	if (IS_ERR(pchip->bledb))
	366	return PTR_ERR(pchip->bledb);
	367	}
	368	return 0;
	369	}
	370
	371	static const struct regmap_config lm3630a_regmap = {
	372	.reg_bits = 8,
	373	.val_bits = 8,
	374	.max_register = REG_MAX,
	375	};
	376
8fbce8ef BM	377	static int lm3630a_parse_led_sources(struct fwnode_handle *node,
	378	int default_led_sources)
	379	{
	380	u32 sources[LM3630A_NUM_SINKS];
	381	int ret, num_sources, i;
	382
072e2c81	383	num_sources = fwnode_property_count_u32(node, "led-sources");
8fbce8ef BM	384	if (num_sources < 0)
	385	return default_led_sources;
	386	else if (num_sources > ARRAY_SIZE(sources))
	387	return -EINVAL;
	388
	389	ret = fwnode_property_read_u32_array(node, "led-sources", sources,
	390	num_sources);
	391	if (ret)
	392	return ret;
	393
	394	for (i = 0; i < num_sources; i++) {
3e799ccd	395	if (sources[i] != LM3630A_SINK_0 && sources[i] != LM3630A_SINK_1)
8fbce8ef BM	396	return -EINVAL;
	397
	398	ret \|= BIT(sources[i]);
	399	}
	400
	401	return ret;
	402	}
	403
	404	static int lm3630a_parse_bank(struct lm3630a_platform_data *pdata,
	405	struct fwnode_handle node, int seen_led_sources)
	406	{
	407	int led_sources, ret;
	408	const char *label;
	409	u32 bank, val;
	410	bool linear;
	411
	412	ret = fwnode_property_read_u32(node, "reg", &bank);
	413	if (ret)
	414	return ret;
	415
3e799ccd	416	if (bank != LM3630A_BANK_0 && bank != LM3630A_BANK_1)
8fbce8ef BM	417	return -EINVAL;
	418
	419	led_sources = lm3630a_parse_led_sources(node, BIT(bank));
	420	if (led_sources < 0)
	421	return led_sources;
	422
	423	if (*seen_led_sources & led_sources)
	424	return -EINVAL;
	425
	426	*seen_led_sources \|= led_sources;
	427
	428	linear = fwnode_property_read_bool(node,
	429	"ti,linear-mapping-mode");
	430	if (bank) {
	431	if (led_sources & BIT(LM3630A_SINK_0) \|\|
	432	!(led_sources & BIT(LM3630A_SINK_1)))
	433	return -EINVAL;
	434
	435	pdata->ledb_ctrl = linear ?
	436	LM3630A_LEDB_ENABLE_LINEAR :
	437	LM3630A_LEDB_ENABLE;
	438	} else {
	439	if (!(led_sources & BIT(LM3630A_SINK_0)))
	440	return -EINVAL;
	441
	442	pdata->leda_ctrl = linear ?
	443	LM3630A_LEDA_ENABLE_LINEAR :
	444	LM3630A_LEDA_ENABLE;
	445
	446	if (led_sources & BIT(LM3630A_SINK_1))
	447	pdata->ledb_ctrl = LM3630A_LEDB_ON_A;
	448	}
	449
	450	ret = fwnode_property_read_string(node, "label", &label);
	451	if (!ret) {
	452	if (bank)
	453	pdata->ledb_label = label;
	454	else
	455	pdata->leda_label = label;
	456	}
	457
	458	ret = fwnode_property_read_u32(node, "default-brightness",
	459	&val);
	460	if (!ret) {
	461	if (bank)
	462	pdata->ledb_init_brt = val;
	463	else
	464	pdata->leda_init_brt = val;
	465	}
	466
	467	ret = fwnode_property_read_u32(node, "max-brightness", &val);
	468	if (!ret) {
	469	if (bank)
	470	pdata->ledb_max_brt = val;
	471	else
	472	pdata->leda_max_brt = val;
	473	}
	474
	475	return 0;
	476	}
	477
	478	static int lm3630a_parse_node(struct lm3630a_chip *pchip,
	479	struct lm3630a_platform_data *pdata)
	480	{
481	int ret = -ENODEV, seen_led_sources = 0;
482	struct fwnode_handle *node;
483
484	device_for_each_child_node(pchip->dev, node) {
485	ret = lm3630a_parse_bank(pdata, node, &seen_led_sources);
6d1c32db AS	486	if (ret) {
6d1c32db AS	487	fwnode_handle_put(node);
8fbce8ef	488	return ret;
6d1c32db	489	}
8fbce8ef BM	490	}
	491
	492	return ret;
	493	}
	494
b2d4f93f	495	static int lm3630a_probe(struct i2c_client *client)
28e64a68	496	{
c512794c	497	struct lm3630a_platform_data *pdata = dev_get_platdata(&client->dev);
28e64a68 DJ	498	struct lm3630a_chip *pchip;
	499	int rval;
	500
	501	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	502	dev_err(&client->dev, "fail : i2c functionality check\n");
	503	return -EOPNOTSUPP;
	504	}
	505
	506	pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630a_chip),
	507	GFP_KERNEL);
	508	if (!pchip)
	509	return -ENOMEM;
	510	pchip->dev = &client->dev;
	511
	512	pchip->regmap = devm_regmap_init_i2c(client, &lm3630a_regmap);
	513	if (IS_ERR(pchip->regmap)) {
	514	rval = PTR_ERR(pchip->regmap);
	515	dev_err(&client->dev, "fail : allocate reg. map: %d\n", rval);
	516	return rval;
	517	}
	518
	519	i2c_set_clientdata(client, pchip);
	520	if (pdata == NULL) {
e19493c1 DC	521	pdata = devm_kzalloc(pchip->dev,
	522	sizeof(struct lm3630a_platform_data),
	523	GFP_KERNEL);
	524	if (pdata == NULL)
28e64a68	525	return -ENOMEM;
8fbce8ef	526
28e64a68	527	/* default values */
e19493c1 DC	528	pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
	529	pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
	530	pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
	531	pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
8fbce8ef BM	532
	533	rval = lm3630a_parse_node(pchip, pdata);
	534	if (rval) {
	535	dev_err(&client->dev, "fail : parse node\n");
	536	return rval;
	537	}
28e64a68	538	}
e19493c1 DC	539	pchip->pdata = pdata;
e19493c1 DC	540
0e0e78e3 AK	541	pchip->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",
0e0e78e3 AK	542	GPIOD_OUT_HIGH);
c9128ed7 KK	543	if (IS_ERR(pchip->enable_gpio))
c9128ed7 KK	544	return PTR_ERR(pchip->enable_gpio);
0e0e78e3	545
28e64a68 DJ	546	/* chip initialize */
	547	rval = lm3630a_chip_init(pchip);
	548	if (rval < 0) {
	549	dev_err(&client->dev, "fail : init chip\n");
	550	return rval;
	551	}
	552	/* backlight register */
	553	rval = lm3630a_backlight_register(pchip);
	554	if (rval < 0) {
	555	dev_err(&client->dev, "fail : backlight register.\n");
	556	return rval;
	557	}
	558	/* pwm */
	559	if (pdata->pwm_ctrl != LM3630A_PWM_DISABLE) {
	560	pchip->pwmd = devm_pwm_get(pchip->dev, "lm3630a-pwm");
b4c385b2 KK	561	if (IS_ERR(pchip->pwmd))
	562	return dev_err_probe(&client->dev, PTR_ERR(pchip->pwmd),
	563	"fail : get pwm device\n");
7ff666bc	564
1181f216	565	pwm_init_state(pchip->pwmd, &pchip->pwmd_state);
28e64a68	566	}
28e64a68 DJ	567
	568	/* interrupt enable : irq 0 is not allowed */
	569	pchip->irq = client->irq;
	570	if (pchip->irq) {
	571	rval = lm3630a_intr_config(pchip);
	572	if (rval < 0)
	573	return rval;
	574	}
	575	dev_info(&client->dev, "LM3630A backlight register OK.\n");
	576	return 0;
	577	}
	578
ed5c2f5f	579	static void lm3630a_remove(struct i2c_client *client)
28e64a68 DJ	580	{
	581	int rval;
	582	struct lm3630a_chip *pchip = i2c_get_clientdata(client);
	583
	584	rval = lm3630a_write(pchip, REG_BRT_A, 0);
	585	if (rval < 0)
	586	dev_err(pchip->dev, "i2c failed to access register\n");
	587
	588	rval = lm3630a_write(pchip, REG_BRT_B, 0);
	589	if (rval < 0)
	590	dev_err(pchip->dev, "i2c failed to access register\n");
	591
	592	if (pchip->irq) {
	593	free_irq(pchip->irq, pchip);
28e64a68 DJ	594	destroy_workqueue(pchip->irqthread);
28e64a68 DJ	595	}
28e64a68 DJ	596	}
	597
	598	static const struct i2c_device_id lm3630a_id[] = {
bfd35877	599	{ LM3630A_NAME },
28e64a68 DJ	600	{}
	601	};
	602
8ad003e7 AK	603	MODULE_DEVICE_TABLE(i2c, lm3630a_id);
8ad003e7 AK	604
8fbce8ef BM	605	static const struct of_device_id lm3630a_match_table[] = {
	606	{ .compatible = "ti,lm3630a", },
	607	{ },
	608	};
	609
8ad003e7	610	MODULE_DEVICE_TABLE(of, lm3630a_match_table);
28e64a68 DJ	611
	612	static struct i2c_driver lm3630a_i2c_driver = {
	613	.driver = {
	614	.name = LM3630A_NAME,
8fbce8ef	615	.of_match_table = lm3630a_match_table,
28e64a68	616	},
29554f2e	617	.probe = lm3630a_probe,
28e64a68 DJ	618	.remove = lm3630a_remove,
	619	.id_table = lm3630a_id,
	620	};
	621
	622	module_i2c_driver(lm3630a_i2c_driver);
	623
	624	MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630A");
	625	MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
	626	MODULE_AUTHOR("LDD MLP <ldd-mlp@list.ti.com>");
	627	MODULE_LICENSE("GPL v2");