[linux-2.6-block.git] / drivers / video / backlight / 88pm860x_bl.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Backlight driver for Marvell Semiconductor 88PM8606
 *
 * Copyright (C) 2009 Marvell International Ltd.
 *	Haojian Zhuang <haojian.zhuang@marvell.com>
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/i2c.h>
#include <linux/backlight.h>
#include <linux/mfd/88pm860x.h>
#include <linux/module.h>

#define MAX_BRIGHTNESS		(0xFF)
#define MIN_BRIGHTNESS		(0)

#define CURRENT_BITMASK		(0x1F << 1)

struct pm860x_backlight_data {
	struct pm860x_chip *chip;
	struct i2c_client *i2c;
	int	current_brightness;
	int	port;
	int	pwm;
	int	iset;
	int	reg_duty_cycle;
	int	reg_always_on;
	int	reg_current;
};

static int backlight_power_set(struct pm860x_chip *chip, int port,
		int on)
{
	int ret = -EINVAL;

	switch (port) {
	case 0:
		ret = on ? pm8606_osc_enable(chip, WLED1_DUTY) :
			pm8606_osc_disable(chip, WLED1_DUTY);
		break;
	case 1:
		ret = on ? pm8606_osc_enable(chip, WLED2_DUTY) :
			pm8606_osc_disable(chip, WLED2_DUTY);
		break;
	case 2:
		ret = on ? pm8606_osc_enable(chip, WLED3_DUTY) :
			pm8606_osc_disable(chip, WLED3_DUTY);
		break;
	}
	return ret;
}

static int pm860x_backlight_set(struct backlight_device *bl, int brightness)
{
	struct pm860x_backlight_data *data = bl_get_data(bl);
	struct pm860x_chip *chip = data->chip;
	unsigned char value;
	int ret;

	if (brightness > MAX_BRIGHTNESS)
		value = MAX_BRIGHTNESS;
	else
		value = brightness;

	if (brightness)
		backlight_power_set(chip, data->port, 1);

	ret = pm860x_reg_write(data->i2c, data->reg_duty_cycle, value);
	if (ret < 0)
		goto out;

	if ((data->current_brightness == 0) && brightness) {
		if (data->iset) {
			ret = pm860x_set_bits(data->i2c, data->reg_current,
					      CURRENT_BITMASK, data->iset);
			if (ret < 0)
				goto out;
		}
		if (data->pwm) {
			ret = pm860x_set_bits(data->i2c, PM8606_PWM,
					      PM8606_PWM_FREQ_MASK, data->pwm);
			if (ret < 0)
				goto out;
		}
		if (brightness == MAX_BRIGHTNESS) {
			/* set WLED_ON bit as 100% */
			ret = pm860x_set_bits(data->i2c, data->reg_always_on,
					      PM8606_WLED_ON, PM8606_WLED_ON);
		}
	} else {
		if (brightness == MAX_BRIGHTNESS) {
			/* set WLED_ON bit as 100% */
			ret = pm860x_set_bits(data->i2c, data->reg_always_on,
					      PM8606_WLED_ON, PM8606_WLED_ON);
		} else {
			/* clear WLED_ON bit since it's not 100% */
			ret = pm860x_set_bits(data->i2c, data->reg_always_on,
					      PM8606_WLED_ON, 0);
		}
	}
	if (ret < 0)
		goto out;

	if (brightness == 0)
		backlight_power_set(chip, data->port, 0);

	dev_dbg(chip->dev, "set brightness %d\n", value);
	data->current_brightness = value;
	return 0;
out:
	dev_dbg(chip->dev, "set brightness %d failure with return value: %d\n",
		value, ret);
	return ret;
}

static int pm860x_backlight_update_status(struct backlight_device *bl)
{
	return pm860x_backlight_set(bl, backlight_get_brightness(bl));
}

static int pm860x_backlight_get_brightness(struct backlight_device *bl)
{
	struct pm860x_backlight_data *data = bl_get_data(bl);
	struct pm860x_chip *chip = data->chip;
	int ret;

	ret = pm860x_reg_read(data->i2c, data->reg_duty_cycle);
	if (ret < 0)
		goto out;
	data->current_brightness = ret;
	dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness);
	return data->current_brightness;
out:
	return -EINVAL;
}

static const struct backlight_ops pm860x_backlight_ops = {
	.options	= BL_CORE_SUSPENDRESUME,
	.update_status	= pm860x_backlight_update_status,
	.get_brightness	= pm860x_backlight_get_brightness,
};

#ifdef CONFIG_OF
static int pm860x_backlight_dt_init(struct platform_device *pdev,
				    struct pm860x_backlight_data *data,
				    char *name)
{
	struct device_node *nproot, *np;
	int iset = 0;

	nproot = of_get_child_by_name(pdev->dev.parent->of_node, "backlights");
	if (!nproot) {
		dev_err(&pdev->dev, "failed to find backlights node\n");
		return -ENODEV;
	}
	for_each_child_of_node(nproot, np) {
		if (of_node_name_eq(np, name)) {
			of_property_read_u32(np, "marvell,88pm860x-iset",
					     &iset);
			data->iset = PM8606_WLED_CURRENT(iset);
			of_property_read_u32(np, "marvell,88pm860x-pwm",
					     &data->pwm);
			of_node_put(np);
			break;
		}
	}
	of_node_put(nproot);
	return 0;
}
#else
#define pm860x_backlight_dt_init(x, y, z)	(-1)
#endif

static int pm860x_backlight_probe(struct platform_device *pdev)
{
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct pm860x_backlight_pdata *pdata = dev_get_platdata(&pdev->dev);
	struct pm860x_backlight_data *data;
	struct backlight_device *bl;
	struct resource *res;
	struct backlight_properties props;
	char name[MFD_NAME_SIZE];
	int ret = 0;

	data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_backlight_data),
			    GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;
	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "duty cycle");
	if (!res) {
		dev_err(&pdev->dev, "No REG resource for duty cycle\n");
		return -ENXIO;
	}
	data->reg_duty_cycle = res->start;
	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "always on");
	if (!res) {
		dev_err(&pdev->dev, "No REG resource for always on\n");
		return -ENXIO;
	}
	data->reg_always_on = res->start;
	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "current");
	if (!res) {
		dev_err(&pdev->dev, "No REG resource for current\n");
		return -ENXIO;
	}
	data->reg_current = res->start;

	memset(name, 0, MFD_NAME_SIZE);
	sprintf(name, "backlight-%d", pdev->id);
	data->port = pdev->id;
	data->chip = chip;
	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
	data->current_brightness = MAX_BRIGHTNESS;
	if (pm860x_backlight_dt_init(pdev, data, name)) {
		if (pdata) {
			data->pwm = pdata->pwm;
			data->iset = pdata->iset;
		}
	}

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = MAX_BRIGHTNESS;
	bl = devm_backlight_device_register(&pdev->dev, name, &pdev->dev, data,
					&pm860x_backlight_ops, &props);
	if (IS_ERR(bl)) {
		dev_err(&pdev->dev, "failed to register backlight\n");
		return PTR_ERR(bl);
	}
	bl->props.brightness = MAX_BRIGHTNESS;

	platform_set_drvdata(pdev, bl);

	/* read current backlight */
	ret = pm860x_backlight_get_brightness(bl);
	if (ret < 0)
		return ret;

	backlight_update_status(bl);
	return 0;
}

static struct platform_driver pm860x_backlight_driver = {
	.driver		= {
		.name	= "88pm860x-backlight",
	},
	.probe		= pm860x_backlight_probe,
};

module_platform_driver(pm860x_backlight_driver);

MODULE_DESCRIPTION("Backlight Driver for Marvell Semiconductor 88PM8606");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:88pm860x-backlight");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
d07e8bf8 HZ	2	/*
	3	* Backlight driver for Marvell Semiconductor 88PM8606
	4	*
	5	* Copyright (C) 2009 Marvell International Ltd.
	6	* Haojian Zhuang <haojian.zhuang@marvell.com>
d07e8bf8 HZ	7	*/
	8
	9	#include <linux/init.h>
	10	#include <linux/kernel.h>
2e57d567	11	#include <linux/of.h>
d07e8bf8	12	#include <linux/platform_device.h>
adb70483	13	#include <linux/slab.h>
d07e8bf8 HZ	14	#include <linux/fb.h>
	15	#include <linux/i2c.h>
	16	#include <linux/backlight.h>
	17	#include <linux/mfd/88pm860x.h>
355b200b	18	#include <linux/module.h>
d07e8bf8 HZ	19
	20	#define MAX_BRIGHTNESS (0xFF)
	21	#define MIN_BRIGHTNESS (0)
	22
2550326a	23	#define CURRENT_BITMASK (0x1F << 1)
d07e8bf8 HZ	24
	25	struct pm860x_backlight_data {
	26	struct pm860x_chip *chip;
	27	struct i2c_client *i2c;
	28	int current_brightness;
	29	int port;
	30	int pwm;
	31	int iset;
a6ccdcd9 HZ	32	int reg_duty_cycle;
	33	int reg_always_on;
	34	int reg_current;
d07e8bf8 HZ	35	};
d07e8bf8 HZ	36
1efc1581 JZ	37	static int backlight_power_set(struct pm860x_chip *chip, int port,
	38	int on)
	39	{
	40	int ret = -EINVAL;
	41
	42	switch (port) {
a6ccdcd9	43	case 0:
1efc1581 JZ	44	ret = on ? pm8606_osc_enable(chip, WLED1_DUTY) :
	45	pm8606_osc_disable(chip, WLED1_DUTY);
	46	break;
a6ccdcd9	47	case 1:
1efc1581 JZ	48	ret = on ? pm8606_osc_enable(chip, WLED2_DUTY) :
	49	pm8606_osc_disable(chip, WLED2_DUTY);
	50	break;
a6ccdcd9	51	case 2:
1efc1581 JZ	52	ret = on ? pm8606_osc_enable(chip, WLED3_DUTY) :
	53	pm8606_osc_disable(chip, WLED3_DUTY);
	54	break;
	55	}
	56	return ret;
	57	}
	58
d07e8bf8 HZ	59	static int pm860x_backlight_set(struct backlight_device *bl, int brightness)
	60	{
	61	struct pm860x_backlight_data *data = bl_get_data(bl);
	62	struct pm860x_chip *chip = data->chip;
	63	unsigned char value;
	64	int ret;
	65
	66	if (brightness > MAX_BRIGHTNESS)
	67	value = MAX_BRIGHTNESS;
	68	else
	69	value = brightness;
	70
1efc1581 JZ	71	if (brightness)
	72	backlight_power_set(chip, data->port, 1);
	73
a6ccdcd9	74	ret = pm860x_reg_write(data->i2c, data->reg_duty_cycle, value);
d07e8bf8 HZ	75	if (ret < 0)
	76	goto out;
	77
	78	if ((data->current_brightness == 0) && brightness) {
	79	if (data->iset) {
a6ccdcd9	80	ret = pm860x_set_bits(data->i2c, data->reg_current,
2550326a	81	CURRENT_BITMASK, data->iset);
d07e8bf8 HZ	82	if (ret < 0)
	83	goto out;
	84	}
	85	if (data->pwm) {
	86	ret = pm860x_set_bits(data->i2c, PM8606_PWM,
	87	PM8606_PWM_FREQ_MASK, data->pwm);
	88	if (ret < 0)
	89	goto out;
	90	}
	91	if (brightness == MAX_BRIGHTNESS) {
	92	/* set WLED_ON bit as 100% */
a6ccdcd9	93	ret = pm860x_set_bits(data->i2c, data->reg_always_on,
d07e8bf8 HZ	94	PM8606_WLED_ON, PM8606_WLED_ON);
	95	}
	96	} else {
	97	if (brightness == MAX_BRIGHTNESS) {
	98	/* set WLED_ON bit as 100% */
a6ccdcd9	99	ret = pm860x_set_bits(data->i2c, data->reg_always_on,
d07e8bf8 HZ	100	PM8606_WLED_ON, PM8606_WLED_ON);
	101	} else {
	102	/* clear WLED_ON bit since it's not 100% */
a6ccdcd9	103	ret = pm860x_set_bits(data->i2c, data->reg_always_on,
d07e8bf8 HZ	104	PM8606_WLED_ON, 0);
	105	}
	106	}
	107	if (ret < 0)
	108	goto out;
	109
1efc1581 JZ	110	if (brightness == 0)
	111	backlight_power_set(chip, data->port, 0);
	112
d07e8bf8 HZ	113	dev_dbg(chip->dev, "set brightness %d\n", value);
	114	data->current_brightness = value;
	115	return 0;
	116	out:
20c5a932 JH	117	dev_dbg(chip->dev, "set brightness %d failure with return value: %d\n",
20c5a932 JH	118	value, ret);
d07e8bf8 HZ	119	return ret;
	120	}
	121
	122	static int pm860x_backlight_update_status(struct backlight_device *bl)
	123	{
51d53e5b	124	return pm860x_backlight_set(bl, backlight_get_brightness(bl));
d07e8bf8 HZ	125	}
	126
	127	static int pm860x_backlight_get_brightness(struct backlight_device *bl)
	128	{
	129	struct pm860x_backlight_data *data = bl_get_data(bl);
	130	struct pm860x_chip *chip = data->chip;
	131	int ret;
	132
a6ccdcd9	133	ret = pm860x_reg_read(data->i2c, data->reg_duty_cycle);
d07e8bf8 HZ	134	if (ret < 0)
	135	goto out;
	136	data->current_brightness = ret;
	137	dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness);
	138	return data->current_brightness;
	139	out:
	140	return -EINVAL;
	141	}
	142
acc2472e	143	static const struct backlight_ops pm860x_backlight_ops = {
d07e8bf8 HZ	144	.options = BL_CORE_SUSPENDRESUME,
	145	.update_status = pm860x_backlight_update_status,
	146	.get_brightness = pm860x_backlight_get_brightness,
	147	};
	148
2e57d567 HZ	149	#ifdef CONFIG_OF
	150	static int pm860x_backlight_dt_init(struct platform_device *pdev,
	151	struct pm860x_backlight_data *data,
	152	char *name)
	153	{
c84c3833	154	struct device_node nproot, np;
2e57d567	155	int iset = 0;
c84c3833	156
c6f77bc2	157	nproot = of_get_child_by_name(pdev->dev.parent->of_node, "backlights");
2e57d567 HZ	158	if (!nproot) {
	159	dev_err(&pdev->dev, "failed to find backlights node\n");
	160	return -ENODEV;
	161	}
	162	for_each_child_of_node(nproot, np) {
3cee7a7d	163	if (of_node_name_eq(np, name)) {
2e57d567 HZ	164	of_property_read_u32(np, "marvell,88pm860x-iset",
	165	&iset);
	166	data->iset = PM8606_WLED_CURRENT(iset);
	167	of_property_read_u32(np, "marvell,88pm860x-pwm",
	168	&data->pwm);
f85de2d9	169	of_node_put(np);
2e57d567 HZ	170	break;
	171	}
	172	}
c84c3833	173	of_node_put(nproot);
2e57d567 HZ	174	return 0;
	175	}
	176	#else
	177	#define pm860x_backlight_dt_init(x, y, z) (-1)
	178	#endif
	179
d07e8bf8 HZ	180	static int pm860x_backlight_probe(struct platform_device *pdev)
	181	{
	182	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
c512794c	183	struct pm860x_backlight_pdata *pdata = dev_get_platdata(&pdev->dev);
d07e8bf8 HZ	184	struct pm860x_backlight_data *data;
	185	struct backlight_device *bl;
	186	struct resource *res;
a19a6ee6	187	struct backlight_properties props;
d07e8bf8	188	char name[MFD_NAME_SIZE];
a6ccdcd9	189	int ret = 0;
d07e8bf8	190
ce969228 JL	191	data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_backlight_data),
ce969228 JL	192	GFP_KERNEL);
d07e8bf8 HZ	193	if (data == NULL)
d07e8bf8 HZ	194	return -ENOMEM;
a6ccdcd9 HZ	195	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "duty cycle");
	196	if (!res) {
	197	dev_err(&pdev->dev, "No REG resource for duty cycle\n");
3a1f9462	198	return -ENXIO;
a6ccdcd9 HZ	199	}
	200	data->reg_duty_cycle = res->start;
	201	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "always on");
	202	if (!res) {
1a84db56	203	dev_err(&pdev->dev, "No REG resource for always on\n");
3a1f9462	204	return -ENXIO;
a6ccdcd9 HZ	205	}
	206	data->reg_always_on = res->start;
	207	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "current");
	208	if (!res) {
	209	dev_err(&pdev->dev, "No REG resource for current\n");
3a1f9462	210	return -ENXIO;
a6ccdcd9 HZ	211	}
	212	data->reg_current = res->start;
	213
	214	memset(name, 0, MFD_NAME_SIZE);
	215	sprintf(name, "backlight-%d", pdev->id);
	216	data->port = pdev->id;
d07e8bf8	217	data->chip = chip;
2fe2380e	218	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
d07e8bf8	219	data->current_brightness = MAX_BRIGHTNESS;
2e57d567 HZ	220	if (pm860x_backlight_dt_init(pdev, data, name)) {
	221	if (pdata) {
	222	data->pwm = pdata->pwm;
	223	data->iset = pdata->iset;
	224	}
d07e8bf8 HZ	225	}
d07e8bf8 HZ	226
a19a6ee6	227	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	228	props.type = BACKLIGHT_RAW;
a19a6ee6	229	props.max_brightness = MAX_BRIGHTNESS;
f829c9ef	230	bl = devm_backlight_device_register(&pdev->dev, name, &pdev->dev, data,
a19a6ee6	231	&pm860x_backlight_ops, &props);
d07e8bf8 HZ	232	if (IS_ERR(bl)) {
d07e8bf8 HZ	233	dev_err(&pdev->dev, "failed to register backlight\n");
d07e8bf8 HZ	234	return PTR_ERR(bl);
d07e8bf8 HZ	235	}
d07e8bf8 HZ	236	bl->props.brightness = MAX_BRIGHTNESS;
	237
	238	platform_set_drvdata(pdev, bl);
	239
d07e8bf8 HZ	240	/* read current backlight */
	241	ret = pm860x_backlight_get_brightness(bl);
	242	if (ret < 0)
f829c9ef	243	return ret;
d07e8bf8 HZ	244
	245	backlight_update_status(bl);
	246	return 0;
d07e8bf8 HZ	247	}
	248
	249	static struct platform_driver pm860x_backlight_driver = {
	250	.driver = {
	251	.name = "88pm860x-backlight",
d07e8bf8 HZ	252	},
d07e8bf8 HZ	253	.probe = pm860x_backlight_probe,
d07e8bf8 HZ	254	};
d07e8bf8 HZ	255
81178e02	256	module_platform_driver(pm860x_backlight_driver);
d07e8bf8 HZ	257
	258	MODULE_DESCRIPTION("Backlight Driver for Marvell Semiconductor 88PM8606");
	259	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	260	MODULE_LICENSE("GPL");
	261	MODULE_ALIAS("platform:88pm860x-backlight");