[mirror_ubuntu-jammy-kernel.git] / drivers / video / backlight / tosa_bl.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  LCD / Backlight control code for Sharp SL-6000x (tosa)
 *
 *  Copyright (c) 2005		Dirk Opfer
 *  Copyright (c) 2007,2008	Dmitry Baryshkov
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/slab.h>

#include <asm/mach/sharpsl_param.h>

#include "tosa_bl.h"

#define COMADJ_DEFAULT	97

#define DAC_CH1		0
#define DAC_CH2		1

struct tosa_bl_data {
	struct i2c_client *i2c;
	struct backlight_device *bl;
	struct gpio_desc *gpio;

	int comadj;
};

static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)
{
	struct spi_device *spi = dev_get_platdata(&data->i2c->dev);

	i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);

	/* SetBacklightDuty */
	i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));

	/* SetBacklightVR */
	gpiod_set_value(data->gpio, brightness & 0x100);

	tosa_bl_enable(spi, brightness);
}

static int tosa_bl_update_status(struct backlight_device *dev)
{
	struct backlight_properties *props = &dev->props;
	struct tosa_bl_data *data = bl_get_data(dev);
	int power = max(props->power, props->fb_blank);
	int brightness = props->brightness;

	if (power)
		brightness = 0;

	tosa_bl_set_backlight(data, brightness);

	return 0;
}

static int tosa_bl_get_brightness(struct backlight_device *dev)
{
	struct backlight_properties *props = &dev->props;

	return props->brightness;
}

static const struct backlight_ops bl_ops = {
	.get_brightness		= tosa_bl_get_brightness,
	.update_status		= tosa_bl_update_status,
};

static int tosa_bl_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{
	struct backlight_properties props;
	struct tosa_bl_data *data;
	int ret = 0;

	data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
				GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
	data->gpio = devm_gpiod_get(&client->dev, "backlight", GPIOD_OUT_LOW);
	ret = PTR_ERR_OR_ZERO(data->gpio);
	if (ret) {
		dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
		return ret;
	}

	i2c_set_clientdata(client, data);
	data->i2c = client;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = 512 - 1;
	data->bl = devm_backlight_device_register(&client->dev, "tosa-bl",
						&client->dev, data, &bl_ops,
						&props);
	if (IS_ERR(data->bl)) {
		ret = PTR_ERR(data->bl);
		goto err_reg;
	}

	data->bl->props.brightness = 69;
	data->bl->props.power = FB_BLANK_UNBLANK;

	backlight_update_status(data->bl);

	return 0;

err_reg:
	data->bl = NULL;
	return ret;
}

static int tosa_bl_remove(struct i2c_client *client)
{
	struct tosa_bl_data *data = i2c_get_clientdata(client);

	data->bl = NULL;
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tosa_bl_suspend(struct device *dev)
{
	struct tosa_bl_data *data = dev_get_drvdata(dev);

	tosa_bl_set_backlight(data, 0);

	return 0;
}

static int tosa_bl_resume(struct device *dev)
{
	struct tosa_bl_data *data = dev_get_drvdata(dev);

	backlight_update_status(data->bl);
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume);

static const struct i2c_device_id tosa_bl_id[] = {
	{ "tosa-bl", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, tosa_bl_id);

static struct i2c_driver tosa_bl_driver = {
	.driver = {
		.name		= "tosa-bl",
		.pm		= &tosa_bl_pm_ops,
	},
	.probe		= tosa_bl_probe,
	.remove		= tosa_bl_remove,
	.id_table	= tosa_bl_id,
};

module_i2c_driver(tosa_bl_driver);

MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
fbd1b17b DB	2	/*
	3	* LCD / Backlight control code for Sharp SL-6000x (tosa)
	4	*
	5	* Copyright (c) 2005 Dirk Opfer
	6	* Copyright (c) 2007,2008 Dmitry Baryshkov
fbd1b17b DB	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
	11	#include <linux/device.h>
	12	#include <linux/spi/spi.h>
	13	#include <linux/i2c.h>
	14	#include <linux/gpio.h>
	15	#include <linux/fb.h>
	16	#include <linux/backlight.h>
5a0e3ad6	17	#include <linux/slab.h>
fbd1b17b DB	18
	19	#include <asm/mach/sharpsl_param.h>
	20
0b0cb52b	21	#include "tosa_bl.h"
fbd1b17b DB	22
	23	#define COMADJ_DEFAULT 97
	24
	25	#define DAC_CH1 0
	26	#define DAC_CH2 1
	27
	28	struct tosa_bl_data {
	29	struct i2c_client *i2c;
	30	struct backlight_device *bl;
0b0cb52b	31	struct gpio_desc *gpio;
fbd1b17b DB	32
	33	int comadj;
	34	};
	35
	36	static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)
	37	{
c512794c	38	struct spi_device *spi = dev_get_platdata(&data->i2c->dev);
fbd1b17b DB	39
	40	i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);
	41
	42	/* SetBacklightDuty */
	43	i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));
	44
	45	/* SetBacklightVR */
0b0cb52b	46	gpiod_set_value(data->gpio, brightness & 0x100);
fbd1b17b DB	47
	48	tosa_bl_enable(spi, brightness);
	49	}
	50
	51	static int tosa_bl_update_status(struct backlight_device *dev)
	52	{
	53	struct backlight_properties *props = &dev->props;
42109b3c	54	struct tosa_bl_data *data = bl_get_data(dev);
fbd1b17b DB	55	int power = max(props->power, props->fb_blank);
	56	int brightness = props->brightness;
	57
	58	if (power)
	59	brightness = 0;
	60
	61	tosa_bl_set_backlight(data, brightness);
	62
	63	return 0;
	64	}
	65
	66	static int tosa_bl_get_brightness(struct backlight_device *dev)
	67	{
	68	struct backlight_properties *props = &dev->props;
	69
	70	return props->brightness;
	71	}
	72
9905a43b	73	static const struct backlight_ops bl_ops = {
fbd1b17b DB	74	.get_brightness = tosa_bl_get_brightness,
	75	.update_status = tosa_bl_update_status,
	76	};
	77
1b9e450d	78	static int tosa_bl_probe(struct i2c_client *client,
fbd1b17b DB	79	const struct i2c_device_id *id)
fbd1b17b DB	80	{
a19a6ee6	81	struct backlight_properties props;
f072c890	82	struct tosa_bl_data *data;
fbd1b17b	83	int ret = 0;
f072c890 JH	84
	85	data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
	86	GFP_KERNEL);
fbd1b17b DB	87	if (!data)
	88	return -ENOMEM;
	89
	90	data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
0b0cb52b AB	91	data->gpio = devm_gpiod_get(&client->dev, "backlight", GPIOD_OUT_LOW);
0b0cb52b AB	92	ret = PTR_ERR_OR_ZERO(data->gpio);
fbd1b17b DB	93	if (ret) {
fbd1b17b DB	94	dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
f072c890	95	return ret;
fbd1b17b	96	}
fbd1b17b DB	97
	98	i2c_set_clientdata(client, data);
	99	data->i2c = client;
	100
a19a6ee6	101	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	102	props.type = BACKLIGHT_RAW;
a19a6ee6	103	props.max_brightness = 512 - 1;
ffb1f6c8 JH	104	data->bl = devm_backlight_device_register(&client->dev, "tosa-bl",
	105	&client->dev, data, &bl_ops,
	106	&props);
fbd1b17b DB	107	if (IS_ERR(data->bl)) {
	108	ret = PTR_ERR(data->bl);
	109	goto err_reg;
	110	}
	111
	112	data->bl->props.brightness = 69;
fbd1b17b DB	113	data->bl->props.power = FB_BLANK_UNBLANK;
	114
	115	backlight_update_status(data->bl);
	116
	117	return 0;
	118
	119	err_reg:
	120	data->bl = NULL;
fbd1b17b DB	121	return ret;
	122	}
	123
7e4b9d0b	124	static int tosa_bl_remove(struct i2c_client *client)
fbd1b17b DB	125	{
	126	struct tosa_bl_data *data = i2c_get_clientdata(client);
	127
fbd1b17b	128	data->bl = NULL;
fbd1b17b DB	129	return 0;
	130	}
	131
1dde37d4 JH	132	#ifdef CONFIG_PM_SLEEP
1dde37d4 JH	133	static int tosa_bl_suspend(struct device *dev)
fbd1b17b	134	{
1dde37d4	135	struct tosa_bl_data *data = dev_get_drvdata(dev);
fbd1b17b DB	136
	137	tosa_bl_set_backlight(data, 0);
	138
	139	return 0;
	140	}
	141
1dde37d4	142	static int tosa_bl_resume(struct device *dev)
fbd1b17b	143	{
1dde37d4	144	struct tosa_bl_data *data = dev_get_drvdata(dev);
fbd1b17b DB	145
	146	backlight_update_status(data->bl);
	147	return 0;
	148	}
fbd1b17b DB	149	#endif
fbd1b17b DB	150
1dde37d4 JH	151	static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume);
1dde37d4 JH	152
fbd1b17b DB	153	static const struct i2c_device_id tosa_bl_id[] = {
	154	{ "tosa-bl", 0 },
	155	{ },
	156	};
13d20b3b	157	MODULE_DEVICE_TABLE(i2c, tosa_bl_id);
fbd1b17b	158
fbd1b17b DB	159	static struct i2c_driver tosa_bl_driver = {
	160	.driver = {
	161	.name = "tosa-bl",
1dde37d4	162	.pm = &tosa_bl_pm_ops,
fbd1b17b DB	163	},
fbd1b17b DB	164	.probe = tosa_bl_probe,
d1723fa2	165	.remove = tosa_bl_remove,
fbd1b17b DB	166	.id_table = tosa_bl_id,
	167	};
	168
81ce6864	169	module_i2c_driver(tosa_bl_driver);
fbd1b17b DB	170
	171	MODULE_AUTHOR("Dmitry Baryshkov");
	172	MODULE_LICENSE("GPL v2");
	173	MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
	174