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

/*
 *  LCD / Backlight control code for Sharp SL-6000x (tosa)
 *
 *  Copyright (c) 2005		Dirk Opfer
 *  Copyright (c) 2007,2008	Dmitry Baryshkov
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 */

#include <linux/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 <mach/tosa.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;

	int comadj;
};

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

	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 */
	gpio_set_value(TOSA_GPIO_BL_C20MA, 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 = dev_get_drvdata(&dev->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 __devinit 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;

	ret = devm_gpio_request(&client->dev, TOSA_GPIO_BL_C20MA, "backlight");
	if (ret) {
		dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
		return ret;
	}
	ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0);
	if (ret)
		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 = backlight_device_register("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 __devexit tosa_bl_remove(struct i2c_client *client)
{
	struct tosa_bl_data *data = i2c_get_clientdata(client);

	backlight_device_unregister(data->bl);
	data->bl = NULL;

	return 0;
}

#ifdef CONFIG_PM
static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm)
{
	struct tosa_bl_data *data = i2c_get_clientdata(client);

	tosa_bl_set_backlight(data, 0);

	return 0;
}

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

	backlight_update_status(data->bl);
	return 0;
}
#else
#define tosa_bl_suspend NULL
#define tosa_bl_resume NULL
#endif

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


static struct i2c_driver tosa_bl_driver = {
	.driver = {
		.name		= "tosa-bl",
		.owner		= THIS_MODULE,
	},
	.probe		= tosa_bl_probe,
	.remove		= __devexit_p(tosa_bl_remove),
	.suspend	= tosa_bl_suspend,
	.resume		= tosa_bl_resume,
	.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
fbd1b17b DB	1	/*
	2	* LCD / Backlight control code for Sharp SL-6000x (tosa)
	3	*
	4	* Copyright (c) 2005 Dirk Opfer
	5	* Copyright (c) 2007,2008 Dmitry Baryshkov
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
	15	#include <linux/device.h>
	16	#include <linux/spi/spi.h>
	17	#include <linux/i2c.h>
	18	#include <linux/gpio.h>
	19	#include <linux/fb.h>
	20	#include <linux/backlight.h>
5a0e3ad6	21	#include <linux/slab.h>
fbd1b17b DB	22
	23	#include <asm/mach/sharpsl_param.h>
	24
	25	#include <mach/tosa.h>
	26
	27	#define COMADJ_DEFAULT 97
	28
	29	#define DAC_CH1 0
	30	#define DAC_CH2 1
	31
	32	struct tosa_bl_data {
	33	struct i2c_client *i2c;
	34	struct backlight_device *bl;
	35
	36	int comadj;
	37	};
	38
	39	static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)
	40	{
	41	struct spi_device *spi = data->i2c->dev.platform_data;
	42
	43	i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);
	44
	45	/* SetBacklightDuty */
	46	i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));
	47
	48	/* SetBacklightVR */
	49	gpio_set_value(TOSA_GPIO_BL_C20MA, brightness & 0x100);
	50
	51	tosa_bl_enable(spi, brightness);
	52	}
	53
	54	static int tosa_bl_update_status(struct backlight_device *dev)
	55	{
	56	struct backlight_properties *props = &dev->props;
	57	struct tosa_bl_data *data = dev_get_drvdata(&dev->dev);
	58	int power = max(props->power, props->fb_blank);
	59	int brightness = props->brightness;
	60
	61	if (power)
	62	brightness = 0;
	63
	64	tosa_bl_set_backlight(data, brightness);
	65
	66	return 0;
	67	}
	68
	69	static int tosa_bl_get_brightness(struct backlight_device *dev)
	70	{
	71	struct backlight_properties *props = &dev->props;
	72
	73	return props->brightness;
	74	}
	75
9905a43b	76	static const struct backlight_ops bl_ops = {
fbd1b17b DB	77	.get_brightness = tosa_bl_get_brightness,
	78	.update_status = tosa_bl_update_status,
	79	};
	80
	81	static int __devinit tosa_bl_probe(struct i2c_client *client,
	82	const struct i2c_device_id *id)
	83	{
a19a6ee6	84	struct backlight_properties props;
f072c890	85	struct tosa_bl_data *data;
fbd1b17b	86	int ret = 0;
f072c890 JH	87
	88	data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
	89	GFP_KERNEL);
fbd1b17b DB	90	if (!data)
	91	return -ENOMEM;
	92
	93	data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
	94
f5b71941	95	ret = devm_gpio_request(&client->dev, TOSA_GPIO_BL_C20MA, "backlight");
fbd1b17b DB	96	if (ret) {
fbd1b17b DB	97	dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
f072c890	98	return ret;
fbd1b17b DB	99	}
	100	ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0);
	101	if (ret)
f5b71941	102	return ret;
fbd1b17b DB	103
	104	i2c_set_clientdata(client, data);
	105	data->i2c = client;
	106
a19a6ee6	107	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	108	props.type = BACKLIGHT_RAW;
a19a6ee6 MG	109	props.max_brightness = 512 - 1;
	110	data->bl = backlight_device_register("tosa-bl", &client->dev, data,
	111	&bl_ops, &props);
fbd1b17b DB	112	if (IS_ERR(data->bl)) {
	113	ret = PTR_ERR(data->bl);
	114	goto err_reg;
	115	}
	116
	117	data->bl->props.brightness = 69;
fbd1b17b DB	118	data->bl->props.power = FB_BLANK_UNBLANK;
	119
	120	backlight_update_status(data->bl);
	121
	122	return 0;
	123
	124	err_reg:
	125	data->bl = NULL;
fbd1b17b DB	126	return ret;
	127	}
	128
	129	static int __devexit tosa_bl_remove(struct i2c_client *client)
	130	{
	131	struct tosa_bl_data *data = i2c_get_clientdata(client);
	132
	133	backlight_device_unregister(data->bl);
	134	data->bl = NULL;
fbd1b17b	135
fbd1b17b DB	136	return 0;
	137	}
	138
	139	#ifdef CONFIG_PM
	140	static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm)
	141	{
	142	struct tosa_bl_data *data = i2c_get_clientdata(client);
	143
	144	tosa_bl_set_backlight(data, 0);
	145
	146	return 0;
	147	}
	148
	149	static int tosa_bl_resume(struct i2c_client *client)
	150	{
	151	struct tosa_bl_data *data = i2c_get_clientdata(client);
	152
	153	backlight_update_status(data->bl);
	154	return 0;
	155	}
	156	#else
	157	#define tosa_bl_suspend NULL
	158	#define tosa_bl_resume NULL
	159	#endif
	160
	161	static const struct i2c_device_id tosa_bl_id[] = {
	162	{ "tosa-bl", 0 },
	163	{ },
	164	};
	165
	166
	167	static struct i2c_driver tosa_bl_driver = {
	168	.driver = {
	169	.name = "tosa-bl",
	170	.owner = THIS_MODULE,
	171	},
	172	.probe = tosa_bl_probe,
	173	.remove = __devexit_p(tosa_bl_remove),
	174	.suspend = tosa_bl_suspend,
	175	.resume = tosa_bl_resume,
	176	.id_table = tosa_bl_id,
	177	};
	178
81ce6864	179	module_i2c_driver(tosa_bl_driver);
fbd1b17b DB	180
	181	MODULE_AUTHOR("Dmitry Baryshkov");
	182	MODULE_LICENSE("GPL v2");
	183	MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
	184