[mirror_ubuntu-jammy-kernel.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/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 regmap *regmap;
	struct pwm_device *pwmd;
};

/* 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 void lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
{
	unsigned int period = pchip->pdata->pwm_period;
	unsigned int duty = br * period / br_max;

	pwm_config(pchip->pwmd, duty, period);
	if (duty)
		pwm_enable(pchip->pwmd);
	else
		pwm_disable(pchip->pwmd);
}

/* 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;

	/* pwm control */
	if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
		lm3630a_pwm_ctrl(pchip, bl->props.brightness,
				 bl->props.max_brightness);
		return bl->props.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, bl->props.brightness);
	if (bl->props.brightness < 0x4)
		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\n");
	return bl->props.brightness;
}

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;
		goto out;
	}

	/* 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;
	brightness = rval;

out:
	bl->props.brightness = brightness;
	return bl->props.brightness;
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;

	/* pwm control */
	if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
		lm3630a_pwm_ctrl(pchip, bl->props.brightness,
				 bl->props.max_brightness);
		return bl->props.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, bl->props.brightness);
	if (bl->props.brightness < 0x4)
		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 REG_CTRL\n");
	return bl->props.brightness;
}

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;
		goto out;
	}

	/* 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;
	brightness = rval;

out:
	bl->props.brightness = brightness;
	return bl->props.brightness;
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;

	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_read_u32_array(node, "led-sources", NULL,
						     0);
	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)
			return ret;
	}

	return ret;
}

static int lm3630a_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	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;

	/* 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)) {
			dev_err(&client->dev, "fail : get pwm device\n");
			return PTR_ERR(pchip->pwmd);
		}

		/*
		 * FIXME: pwm_apply_args() should be removed when switching to
		 * the atomic PWM API.
		 */
		pwm_apply_args(pchip->pwmd);
	}

	/* 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 int 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);
		flush_workqueue(pchip->irqthread);
		destroy_workqueue(pchip->irqthread);
	}
	return 0;
}

static const struct i2c_device_id lm3630a_id[] = {
	{LM3630A_NAME, 0},
	{}
};

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

MODULE_DEVICE_TABLE(i2c, lm3630a_id);

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>
	15	#include <linux/pwm.h>
	16	#include <linux/platform_data/lm3630a_bl.h>
	17
	18	#define REG_CTRL 0x00
	19	#define REG_BOOST 0x02
	20	#define REG_CONFIG 0x01
	21	#define REG_BRT_A 0x03
	22	#define REG_BRT_B 0x04
	23	#define REG_I_A 0x05
	24	#define REG_I_B 0x06
	25	#define REG_INT_STATUS 0x09
	26	#define REG_INT_EN 0x0A
	27	#define REG_FAULT 0x0B
	28	#define REG_PWM_OUTLOW 0x12
	29	#define REG_PWM_OUTHIGH 0x13
06168a64 BS	30	#define REG_FILTER_STRENGTH 0x50
06168a64 BS	31	#define REG_MAX 0x50
28e64a68 DJ	32
28e64a68 DJ	33	#define INT_DEBOUNCE_MSEC 10
8fbce8ef BM	34
	35	#define LM3630A_BANK_0 0
	36	#define LM3630A_BANK_1 1
	37
	38	#define LM3630A_NUM_SINKS 2
	39	#define LM3630A_SINK_0 0
	40	#define LM3630A_SINK_1 1
	41
28e64a68 DJ	42	struct lm3630a_chip {
	43	struct device *dev;
	44	struct delayed_work work;
	45
	46	int irq;
	47	struct workqueue_struct *irqthread;
	48	struct lm3630a_platform_data *pdata;
	49	struct backlight_device *bleda;
	50	struct backlight_device *bledb;
	51	struct regmap *regmap;
	52	struct pwm_device *pwmd;
	53	};
	54
	55	/* i2c access */
	56	static int lm3630a_read(struct lm3630a_chip *pchip, unsigned int reg)
	57	{
	58	int rval;
	59	unsigned int reg_val;
	60
	61	rval = regmap_read(pchip->regmap, reg, &reg_val);
	62	if (rval < 0)
	63	return rval;
	64	return reg_val & 0xFF;
	65	}
	66
	67	static int lm3630a_write(struct lm3630a_chip *pchip,
	68	unsigned int reg, unsigned int data)
	69	{
	70	return regmap_write(pchip->regmap, reg, data);
	71	}
	72
	73	static int lm3630a_update(struct lm3630a_chip *pchip,
	74	unsigned int reg, unsigned int mask,
	75	unsigned int data)
	76	{
	77	return regmap_update_bits(pchip->regmap, reg, mask, data);
	78	}
	79
	80	/* initialize chip */
	81	static int lm3630a_chip_init(struct lm3630a_chip *pchip)
	82	{
	83	int rval;
	84	struct lm3630a_platform_data *pdata = pchip->pdata;
	85
	86	usleep_range(1000, 2000);
	87	/* set Filter Strength Register */
06168a64	88	rval = lm3630a_write(pchip, REG_FILTER_STRENGTH, 0x03);
28e64a68 DJ	89	/* set Cofig. register */
	90	rval \|= lm3630a_update(pchip, REG_CONFIG, 0x07, pdata->pwm_ctrl);
	91	/* set boost control */
	92	rval \|= lm3630a_write(pchip, REG_BOOST, 0x38);
	93	/* set current A */
	94	rval \|= lm3630a_update(pchip, REG_I_A, 0x1F, 0x1F);
	95	/* set current B */
	96	rval \|= lm3630a_write(pchip, REG_I_B, 0x1F);
	97	/* set control */
4c4d2a3a DJ	98	rval \|= lm3630a_update(pchip, REG_CTRL, 0x14, pdata->leda_ctrl);
4c4d2a3a DJ	99	rval \|= lm3630a_update(pchip, REG_CTRL, 0x0B, pdata->ledb_ctrl);
28e64a68 DJ	100	usleep_range(1000, 2000);
	101	/* set brightness A and B */
	102	rval \|= lm3630a_write(pchip, REG_BRT_A, pdata->leda_init_brt);
	103	rval \|= lm3630a_write(pchip, REG_BRT_B, pdata->ledb_init_brt);
	104
	105	if (rval < 0)
	106	dev_err(pchip->dev, "i2c failed to access register\n");
	107	return rval;
	108	}
	109
	110	/* interrupt handling */
	111	static void lm3630a_delayed_func(struct work_struct *work)
	112	{
2a0c316b	113	int rval;
28e64a68 DJ	114	struct lm3630a_chip *pchip;
	115
	116	pchip = container_of(work, struct lm3630a_chip, work.work);
	117
	118	rval = lm3630a_read(pchip, REG_INT_STATUS);
	119	if (rval < 0) {
	120	dev_err(pchip->dev,
	121	"i2c failed to access REG_INT_STATUS Register\n");
	122	return;
	123	}
	124
	125	dev_info(pchip->dev, "REG_INT_STATUS Register is 0x%x\n", rval);
	126	}
	127
	128	static irqreturn_t lm3630a_isr_func(int irq, void *chip)
	129	{
	130	int rval;
	131	struct lm3630a_chip *pchip = chip;
	132	unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC);
	133
	134	queue_delayed_work(pchip->irqthread, &pchip->work, delay);
	135
	136	rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	137	if (rval < 0) {
	138	dev_err(pchip->dev, "i2c failed to access register\n");
	139	return IRQ_NONE;
	140	}
	141	return IRQ_HANDLED;
	142	}
	143
	144	static int lm3630a_intr_config(struct lm3630a_chip *pchip)
	145	{
	146	int rval;
	147
	148	rval = lm3630a_write(pchip, REG_INT_EN, 0x87);
	149	if (rval < 0)
	150	return rval;
	151
	152	INIT_DELAYED_WORK(&pchip->work, lm3630a_delayed_func);
	153	pchip->irqthread = create_singlethread_workqueue("lm3630a-irqthd");
	154	if (!pchip->irqthread) {
	155	dev_err(pchip->dev, "create irq thread fail\n");
	156	return -ENOMEM;
	157	}
	158	if (request_threaded_irq
	159	(pchip->irq, NULL, lm3630a_isr_func,
	160	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT, "lm3630a_irq", pchip)) {
	161	dev_err(pchip->dev, "request threaded irq fail\n");
bcd5b416	162	destroy_workqueue(pchip->irqthread);
28e64a68 DJ	163	return -ENOMEM;
	164	}
	165	return rval;
	166	}
	167
	168	static void lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
	169	{
4ff66efd	170	unsigned int period = pchip->pdata->pwm_period;
28e64a68 DJ	171	unsigned int duty = br * period / br_max;
	172
	173	pwm_config(pchip->pwmd, duty, period);
	174	if (duty)
	175	pwm_enable(pchip->pwmd);
	176	else
	177	pwm_disable(pchip->pwmd);
	178	}
	179
	180	/* update and get brightness */
	181	static int lm3630a_bank_a_update_status(struct backlight_device *bl)
	182	{
	183	int ret;
	184	struct lm3630a_chip *pchip = bl_get_data(bl);
	185	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
	186
	187	/* pwm control */
	188	if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
	189	lm3630a_pwm_ctrl(pchip, bl->props.brightness,
	190	bl->props.max_brightness);
	191	return bl->props.brightness;
	192	}
	193
	194	/* disable sleep */
	195	ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	196	if (ret < 0)
	197	goto out_i2c_err;
	198	usleep_range(1000, 2000);
	199	/* minimum brightness is 0x04 */
	200	ret = lm3630a_write(pchip, REG_BRT_A, bl->props.brightness);
	201	if (bl->props.brightness < 0x4)
	202	ret \|= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDA_ENABLE, 0);
	203	else
	204	ret \|= lm3630a_update(pchip, REG_CTRL,
	205	LM3630A_LEDA_ENABLE, LM3630A_LEDA_ENABLE);
	206	if (ret < 0)
	207	goto out_i2c_err;
d3f48ec0	208	return 0;
28e64a68 DJ	209
	210	out_i2c_err:
	211	dev_err(pchip->dev, "i2c failed to access\n");
	212	return bl->props.brightness;
	213	}
	214
	215	static int lm3630a_bank_a_get_brightness(struct backlight_device *bl)
	216	{
	217	int brightness, rval;
	218	struct lm3630a_chip *pchip = bl_get_data(bl);
	219	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
	220
	221	if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
	222	rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
	223	if (rval < 0)
	224	goto out_i2c_err;
	225	brightness = (rval & 0x01) << 8;
	226	rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
	227	if (rval < 0)
	228	goto out_i2c_err;
	229	brightness \|= rval;
	230	goto out;
	231	}
	232
	233	/* disable sleep */
	234	rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	235	if (rval < 0)
	236	goto out_i2c_err;
	237	usleep_range(1000, 2000);
	238	rval = lm3630a_read(pchip, REG_BRT_A);
	239	if (rval < 0)
	240	goto out_i2c_err;
	241	brightness = rval;
	242
	243	out:
	244	bl->props.brightness = brightness;
	245	return bl->props.brightness;
	246	out_i2c_err:
	247	dev_err(pchip->dev, "i2c failed to access register\n");
	248	return 0;
	249	}
	250
	251	static const struct backlight_ops lm3630a_bank_a_ops = {
	252	.options = BL_CORE_SUSPENDRESUME,
	253	.update_status = lm3630a_bank_a_update_status,
	254	.get_brightness = lm3630a_bank_a_get_brightness,
	255	};
	256
	257	/* update and get brightness */
	258	static int lm3630a_bank_b_update_status(struct backlight_device *bl)
	259	{
	260	int ret;
	261	struct lm3630a_chip *pchip = bl_get_data(bl);
	262	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
	263
	264	/* pwm control */
	265	if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
	266	lm3630a_pwm_ctrl(pchip, bl->props.brightness,
	267	bl->props.max_brightness);
	268	return bl->props.brightness;
	269	}
	270
	271	/* disable sleep */
	272	ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
273	if (ret < 0)
274	goto out_i2c_err;
275	usleep_range(1000, 2000);
276	/* minimum brightness is 0x04 */
277	ret = lm3630a_write(pchip, REG_BRT_B, bl->props.brightness);
278	if (bl->props.brightness < 0x4)
279	ret \|= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDB_ENABLE, 0);
280	else
281	ret \|= lm3630a_update(pchip, REG_CTRL,
282	LM3630A_LEDB_ENABLE, LM3630A_LEDB_ENABLE);
283	if (ret < 0)
284	goto out_i2c_err;
d3f48ec0	285	return 0;
28e64a68 DJ	286
	287	out_i2c_err:
	288	dev_err(pchip->dev, "i2c failed to access REG_CTRL\n");
	289	return bl->props.brightness;
	290	}
	291
	292	static int lm3630a_bank_b_get_brightness(struct backlight_device *bl)
	293	{
	294	int brightness, rval;
	295	struct lm3630a_chip *pchip = bl_get_data(bl);
	296	enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
	297
	298	if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
	299	rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
	300	if (rval < 0)
	301	goto out_i2c_err;
	302	brightness = (rval & 0x01) << 8;
	303	rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
	304	if (rval < 0)
	305	goto out_i2c_err;
	306	brightness \|= rval;
	307	goto out;
	308	}
	309
	310	/* disable sleep */
	311	rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
	312	if (rval < 0)
	313	goto out_i2c_err;
	314	usleep_range(1000, 2000);
	315	rval = lm3630a_read(pchip, REG_BRT_B);
	316	if (rval < 0)
	317	goto out_i2c_err;
	318	brightness = rval;
	319
	320	out:
	321	bl->props.brightness = brightness;
	322	return bl->props.brightness;
	323	out_i2c_err:
	324	dev_err(pchip->dev, "i2c failed to access register\n");
	325	return 0;
	326	}
	327
	328	static const struct backlight_ops lm3630a_bank_b_ops = {
	329	.options = BL_CORE_SUSPENDRESUME,
	330	.update_status = lm3630a_bank_b_update_status,
	331	.get_brightness = lm3630a_bank_b_get_brightness,
	332	};
	333
	334	static int lm3630a_backlight_register(struct lm3630a_chip *pchip)
	335	{
28e64a68	336	struct lm3630a_platform_data *pdata = pchip->pdata;
8fbce8ef BM	337	struct backlight_properties props;
8fbce8ef BM	338	const char *label;
28e64a68 DJ	339
	340	props.type = BACKLIGHT_RAW;
	341	if (pdata->leda_ctrl != LM3630A_LEDA_DISABLE) {
	342	props.brightness = pdata->leda_init_brt;
	343	props.max_brightness = pdata->leda_max_brt;
8fbce8ef	344	label = pdata->leda_label ? pdata->leda_label : "lm3630a_leda";
28e64a68	345	pchip->bleda =
8fbce8ef	346	devm_backlight_device_register(pchip->dev, label,
28e64a68 DJ	347	pchip->dev, pchip,
	348	&lm3630a_bank_a_ops, &props);
	349	if (IS_ERR(pchip->bleda))
	350	return PTR_ERR(pchip->bleda);
	351	}
	352
	353	if ((pdata->ledb_ctrl != LM3630A_LEDB_DISABLE) &&
	354	(pdata->ledb_ctrl != LM3630A_LEDB_ON_A)) {
	355	props.brightness = pdata->ledb_init_brt;
	356	props.max_brightness = pdata->ledb_max_brt;
8fbce8ef	357	label = pdata->ledb_label ? pdata->ledb_label : "lm3630a_ledb";
28e64a68	358	pchip->bledb =
8fbce8ef	359	devm_backlight_device_register(pchip->dev, label,
28e64a68 DJ	360	pchip->dev, pchip,
	361	&lm3630a_bank_b_ops, &props);
	362	if (IS_ERR(pchip->bledb))
	363	return PTR_ERR(pchip->bledb);
	364	}
	365	return 0;
	366	}
	367
	368	static const struct regmap_config lm3630a_regmap = {
	369	.reg_bits = 8,
	370	.val_bits = 8,
	371	.max_register = REG_MAX,
	372	};
	373
8fbce8ef BM	374	static int lm3630a_parse_led_sources(struct fwnode_handle *node,
	375	int default_led_sources)
	376	{
	377	u32 sources[LM3630A_NUM_SINKS];
	378	int ret, num_sources, i;
	379
	380	num_sources = fwnode_property_read_u32_array(node, "led-sources", NULL,
	381	0);
	382	if (num_sources < 0)
	383	return default_led_sources;
	384	else if (num_sources > ARRAY_SIZE(sources))
	385	return -EINVAL;
	386
	387	ret = fwnode_property_read_u32_array(node, "led-sources", sources,
	388	num_sources);
	389	if (ret)
	390	return ret;
	391
	392	for (i = 0; i < num_sources; i++) {
	393	if (sources[i] < LM3630A_SINK_0 \|\| sources[i] > LM3630A_SINK_1)
	394	return -EINVAL;
	395
	396	ret \|= BIT(sources[i]);
	397	}
	398
	399	return ret;
	400	}
	401
	402	static int lm3630a_parse_bank(struct lm3630a_platform_data *pdata,
	403	struct fwnode_handle node, int seen_led_sources)
	404	{
	405	int led_sources, ret;
	406	const char *label;
	407	u32 bank, val;
	408	bool linear;
	409
	410	ret = fwnode_property_read_u32(node, "reg", &bank);
	411	if (ret)
	412	return ret;
	413
	414	if (bank < LM3630A_BANK_0 \|\| bank > LM3630A_BANK_1)
	415	return -EINVAL;
	416
	417	led_sources = lm3630a_parse_led_sources(node, BIT(bank));
	418	if (led_sources < 0)
	419	return led_sources;
	420
	421	if (*seen_led_sources & led_sources)
	422	return -EINVAL;
	423
	424	*seen_led_sources \|= led_sources;
	425
	426	linear = fwnode_property_read_bool(node,
	427	"ti,linear-mapping-mode");
	428	if (bank) {
	429	if (led_sources & BIT(LM3630A_SINK_0) \|\|
	430	!(led_sources & BIT(LM3630A_SINK_1)))
	431	return -EINVAL;
	432
	433	pdata->ledb_ctrl = linear ?
	434	LM3630A_LEDB_ENABLE_LINEAR :
	435	LM3630A_LEDB_ENABLE;
	436	} else {
	437	if (!(led_sources & BIT(LM3630A_SINK_0)))
438	return -EINVAL;
439
440	pdata->leda_ctrl = linear ?
441	LM3630A_LEDA_ENABLE_LINEAR :
442	LM3630A_LEDA_ENABLE;
443
444	if (led_sources & BIT(LM3630A_SINK_1))
445	pdata->ledb_ctrl = LM3630A_LEDB_ON_A;
446	}
447
448	ret = fwnode_property_read_string(node, "label", &label);
449	if (!ret) {
450	if (bank)
451	pdata->ledb_label = label;
452	else
453	pdata->leda_label = label;
454	}
455
456	ret = fwnode_property_read_u32(node, "default-brightness",
457	&val);
458	if (!ret) {
459	if (bank)
460	pdata->ledb_init_brt = val;
461	else
462	pdata->leda_init_brt = val;
463	}
464
465	ret = fwnode_property_read_u32(node, "max-brightness", &val);
466	if (!ret) {
467	if (bank)
468	pdata->ledb_max_brt = val;
469	else
470	pdata->leda_max_brt = val;
471	}
472
473	return 0;
474	}
475
476	static int lm3630a_parse_node(struct lm3630a_chip *pchip,
477	struct lm3630a_platform_data *pdata)
478	{
479	int ret = -ENODEV, seen_led_sources = 0;
480	struct fwnode_handle *node;
481
482	device_for_each_child_node(pchip->dev, node) {
483	ret = lm3630a_parse_bank(pdata, node, &seen_led_sources);
484	if (ret)
485	return ret;
486	}
487
488	return ret;
489	}
490
28e64a68 DJ	491	static int lm3630a_probe(struct i2c_client *client,
	492	const struct i2c_device_id *id)
	493	{
c512794c	494	struct lm3630a_platform_data *pdata = dev_get_platdata(&client->dev);
28e64a68 DJ	495	struct lm3630a_chip *pchip;
	496	int rval;
	497
	498	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	499	dev_err(&client->dev, "fail : i2c functionality check\n");
	500	return -EOPNOTSUPP;
	501	}
	502
	503	pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630a_chip),
	504	GFP_KERNEL);
	505	if (!pchip)
	506	return -ENOMEM;
	507	pchip->dev = &client->dev;
	508
	509	pchip->regmap = devm_regmap_init_i2c(client, &lm3630a_regmap);
	510	if (IS_ERR(pchip->regmap)) {
	511	rval = PTR_ERR(pchip->regmap);
	512	dev_err(&client->dev, "fail : allocate reg. map: %d\n", rval);
	513	return rval;
	514	}
	515
	516	i2c_set_clientdata(client, pchip);
	517	if (pdata == NULL) {
e19493c1 DC	518	pdata = devm_kzalloc(pchip->dev,
	519	sizeof(struct lm3630a_platform_data),
	520	GFP_KERNEL);
	521	if (pdata == NULL)
28e64a68	522	return -ENOMEM;
8fbce8ef	523
28e64a68	524	/* default values */
e19493c1 DC	525	pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
	526	pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
	527	pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
	528	pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
8fbce8ef BM	529
	530	rval = lm3630a_parse_node(pchip, pdata);
	531	if (rval) {
	532	dev_err(&client->dev, "fail : parse node\n");
	533	return rval;
	534	}
28e64a68	535	}
e19493c1 DC	536	pchip->pdata = pdata;
e19493c1 DC	537
28e64a68 DJ	538	/* chip initialize */
	539	rval = lm3630a_chip_init(pchip);
	540	if (rval < 0) {
	541	dev_err(&client->dev, "fail : init chip\n");
	542	return rval;
	543	}
	544	/* backlight register */
	545	rval = lm3630a_backlight_register(pchip);
	546	if (rval < 0) {
	547	dev_err(&client->dev, "fail : backlight register.\n");
	548	return rval;
	549	}
	550	/* pwm */
	551	if (pdata->pwm_ctrl != LM3630A_PWM_DISABLE) {
	552	pchip->pwmd = devm_pwm_get(pchip->dev, "lm3630a-pwm");
	553	if (IS_ERR(pchip->pwmd)) {
	554	dev_err(&client->dev, "fail : get pwm device\n");
	555	return PTR_ERR(pchip->pwmd);
	556	}
7ff666bc BB	557
	558	/*
	559	* FIXME: pwm_apply_args() should be removed when switching to
	560	* the atomic PWM API.
	561	*/
	562	pwm_apply_args(pchip->pwmd);
28e64a68	563	}
28e64a68 DJ	564
	565	/* interrupt enable : irq 0 is not allowed */
	566	pchip->irq = client->irq;
	567	if (pchip->irq) {
	568	rval = lm3630a_intr_config(pchip);
	569	if (rval < 0)
	570	return rval;
	571	}
	572	dev_info(&client->dev, "LM3630A backlight register OK.\n");
	573	return 0;
	574	}
	575
	576	static int lm3630a_remove(struct i2c_client *client)
	577	{
	578	int rval;
	579	struct lm3630a_chip *pchip = i2c_get_clientdata(client);
	580
	581	rval = lm3630a_write(pchip, REG_BRT_A, 0);
	582	if (rval < 0)
	583	dev_err(pchip->dev, "i2c failed to access register\n");
	584
	585	rval = lm3630a_write(pchip, REG_BRT_B, 0);
	586	if (rval < 0)
	587	dev_err(pchip->dev, "i2c failed to access register\n");
	588
	589	if (pchip->irq) {
	590	free_irq(pchip->irq, pchip);
	591	flush_workqueue(pchip->irqthread);
	592	destroy_workqueue(pchip->irqthread);
	593	}
	594	return 0;
	595	}
	596
	597	static const struct i2c_device_id lm3630a_id[] = {
	598	{LM3630A_NAME, 0},
	599	{}
	600	};
	601
8fbce8ef BM	602	static const struct of_device_id lm3630a_match_table[] = {
	603	{ .compatible = "ti,lm3630a", },
	604	{ },
	605	};
	606
28e64a68 DJ	607	MODULE_DEVICE_TABLE(i2c, lm3630a_id);
	608
	609	static struct i2c_driver lm3630a_i2c_driver = {
	610	.driver = {
	611	.name = LM3630A_NAME,
8fbce8ef	612	.of_match_table = lm3630a_match_table,
28e64a68 DJ	613	},
	614	.probe = lm3630a_probe,
	615	.remove = lm3630a_remove,
	616	.id_table = lm3630a_id,
	617	};
	618
	619	module_i2c_driver(lm3630a_i2c_driver);
	620
	621	MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630A");
	622	MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
	623	MODULE_AUTHOR("LDD MLP <ldd-mlp@list.ti.com>");
	624	MODULE_LICENSE("GPL v2");