[deliverable/linux.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 = 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 */
	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 = 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;

	ret = devm_gpio_request_one(&client->dev, TOSA_GPIO_BL_C20MA,
				GPIOF_OUT_INIT_LOW, "backlight");
	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",
		.owner		= THIS_MODULE,
		.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
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	{
c512794c	41	struct spi_device *spi = dev_get_platdata(&data->i2c->dev);
fbd1b17b DB	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;
42109b3c	57	struct tosa_bl_data *data = bl_get_data(dev);
fbd1b17b DB	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
1b9e450d	81	static int tosa_bl_probe(struct i2c_client *client,
fbd1b17b DB	82	const struct i2c_device_id *id)
fbd1b17b DB	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
05a5d4d2 JH	95	ret = devm_gpio_request_one(&client->dev, TOSA_GPIO_BL_C20MA,
05a5d4d2 JH	96	GPIOF_OUT_INIT_LOW, "backlight");
fbd1b17b DB	97	if (ret) {
fbd1b17b DB	98	dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
f072c890	99	return ret;
fbd1b17b	100	}
fbd1b17b DB	101
	102	i2c_set_clientdata(client, data);
	103	data->i2c = client;
	104
a19a6ee6	105	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	106	props.type = BACKLIGHT_RAW;
a19a6ee6	107	props.max_brightness = 512 - 1;
ffb1f6c8 JH	108	data->bl = devm_backlight_device_register(&client->dev, "tosa-bl",
	109	&client->dev, data, &bl_ops,
	110	&props);
fbd1b17b DB	111	if (IS_ERR(data->bl)) {
	112	ret = PTR_ERR(data->bl);
	113	goto err_reg;
	114	}
	115
	116	data->bl->props.brightness = 69;
fbd1b17b DB	117	data->bl->props.power = FB_BLANK_UNBLANK;
	118
	119	backlight_update_status(data->bl);
	120
	121	return 0;
	122
	123	err_reg:
	124	data->bl = NULL;
fbd1b17b DB	125	return ret;
	126	}
	127
7e4b9d0b	128	static int tosa_bl_remove(struct i2c_client *client)
fbd1b17b DB	129	{
	130	struct tosa_bl_data *data = i2c_get_clientdata(client);
	131
fbd1b17b	132	data->bl = NULL;
fbd1b17b DB	133	return 0;
	134	}
	135
1dde37d4 JH	136	#ifdef CONFIG_PM_SLEEP
1dde37d4 JH	137	static int tosa_bl_suspend(struct device *dev)
fbd1b17b	138	{
1dde37d4	139	struct tosa_bl_data *data = dev_get_drvdata(dev);
fbd1b17b DB	140
	141	tosa_bl_set_backlight(data, 0);
	142
	143	return 0;
	144	}
	145
1dde37d4	146	static int tosa_bl_resume(struct device *dev)
fbd1b17b	147	{
1dde37d4	148	struct tosa_bl_data *data = dev_get_drvdata(dev);
fbd1b17b DB	149
	150	backlight_update_status(data->bl);
	151	return 0;
	152	}
fbd1b17b DB	153	#endif
fbd1b17b DB	154
1dde37d4 JH	155	static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume);
1dde37d4 JH	156
fbd1b17b DB	157	static const struct i2c_device_id tosa_bl_id[] = {
	158	{ "tosa-bl", 0 },
	159	{ },
	160	};
13d20b3b	161	MODULE_DEVICE_TABLE(i2c, tosa_bl_id);
fbd1b17b	162
fbd1b17b DB	163	static struct i2c_driver tosa_bl_driver = {
	164	.driver = {
	165	.name = "tosa-bl",
	166	.owner = THIS_MODULE,
1dde37d4	167	.pm = &tosa_bl_pm_ops,
fbd1b17b DB	168	},
fbd1b17b DB	169	.probe = tosa_bl_probe,
d1723fa2	170	.remove = tosa_bl_remove,
fbd1b17b DB	171	.id_table = tosa_bl_id,
	172	};
	173
81ce6864	174	module_i2c_driver(tosa_bl_driver);
fbd1b17b DB	175
	176	MODULE_AUTHOR("Dmitry Baryshkov");
	177	MODULE_LICENSE("GPL v2");
	178	MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
	179