[mirror_ubuntu-bionic-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 = kzalloc(sizeof(struct tosa_bl_data), GFP_KERNEL);
	int ret = 0;
	if (!data)
		return -ENOMEM;

	data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;

	ret = gpio_request(TOSA_GPIO_BL_C20MA, "backlight");
	if (ret) {
		dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
		goto err_gpio_bl;
	}
	ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0);
	if (ret)
		goto err_gpio_dir;

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

	memset(&props, 0, sizeof(struct backlight_properties));
	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;
	i2c_set_clientdata(client, NULL);
err_gpio_dir:
	gpio_free(TOSA_GPIO_BL_C20MA);
err_gpio_bl:
	kfree(data);
	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;
	i2c_set_clientdata(client, NULL);

	gpio_free(TOSA_GPIO_BL_C20MA);

	kfree(data);

	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,
};

static int __init tosa_bl_init(void)
{
	return i2c_add_driver(&tosa_bl_driver);
}

static void __exit tosa_bl_exit(void)
{
	i2c_del_driver(&tosa_bl_driver);
}

module_init(tosa_bl_init);
module_exit(tosa_bl_exit);

MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
Commit	Line	Data
fbd1b17b DES	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 DES	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 DES	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;
fbd1b17b DES	85	struct tosa_bl_data *data = kzalloc(sizeof(struct tosa_bl_data), GFP_KERNEL);
	86	int ret = 0;
	87	if (!data)
	88	return -ENOMEM;
	89
	90	data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
	91
	92	ret = gpio_request(TOSA_GPIO_BL_C20MA, "backlight");
	93	if (ret) {
	94	dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
	95	goto err_gpio_bl;
	96	}
	97	ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0);
	98	if (ret)
	99	goto err_gpio_dir;
	100
	101	i2c_set_clientdata(client, data);
	102	data->i2c = client;
	103
a19a6ee6 MG	104	memset(&props, 0, sizeof(struct backlight_properties));
	105	props.max_brightness = 512 - 1;
	106	data->bl = backlight_device_register("tosa-bl", &client->dev, data,
	107	&bl_ops, &props);
fbd1b17b DES	108	if (IS_ERR(data->bl)) {
	109	ret = PTR_ERR(data->bl);
	110	goto err_reg;
	111	}
	112
	113	data->bl->props.brightness = 69;
fbd1b17b DES	114	data->bl->props.power = FB_BLANK_UNBLANK;
	115
	116	backlight_update_status(data->bl);
	117
	118	return 0;
	119
	120	err_reg:
	121	data->bl = NULL;
	122	i2c_set_clientdata(client, NULL);
	123	err_gpio_dir:
	124	gpio_free(TOSA_GPIO_BL_C20MA);
	125	err_gpio_bl:
	126	kfree(data);
	127	return ret;
	128	}
	129
	130	static int __devexit tosa_bl_remove(struct i2c_client *client)
	131	{
	132	struct tosa_bl_data *data = i2c_get_clientdata(client);
	133
	134	backlight_device_unregister(data->bl);
	135	data->bl = NULL;
	136	i2c_set_clientdata(client, NULL);
	137
	138	gpio_free(TOSA_GPIO_BL_C20MA);
	139
	140	kfree(data);
	141
	142	return 0;
	143	}
	144
	145	#ifdef CONFIG_PM
	146	static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm)
	147	{
	148	struct tosa_bl_data *data = i2c_get_clientdata(client);
	149
	150	tosa_bl_set_backlight(data, 0);
	151
	152	return 0;
	153	}
	154
	155	static int tosa_bl_resume(struct i2c_client *client)
	156	{
	157	struct tosa_bl_data *data = i2c_get_clientdata(client);
	158
	159	backlight_update_status(data->bl);
	160	return 0;
	161	}
	162	#else
	163	#define tosa_bl_suspend NULL
	164	#define tosa_bl_resume NULL
	165	#endif
	166
	167	static const struct i2c_device_id tosa_bl_id[] = {
	168	{ "tosa-bl", 0 },
	169	{ },
	170	};
	171
	172
	173	static struct i2c_driver tosa_bl_driver = {
	174	.driver = {
	175	.name = "tosa-bl",
	176	.owner = THIS_MODULE,
	177	},
178	.probe = tosa_bl_probe,
179	.remove = __devexit_p(tosa_bl_remove),
180	.suspend = tosa_bl_suspend,
181	.resume = tosa_bl_resume,
182	.id_table = tosa_bl_id,
183	};
184
185	static int __init tosa_bl_init(void)
186	{
187	return i2c_add_driver(&tosa_bl_driver);
188	}
189
190	static void __exit tosa_bl_exit(void)
191	{
192	i2c_del_driver(&tosa_bl_driver);
193	}
194
195	module_init(tosa_bl_init);
196	module_exit(tosa_bl_exit);
197
198	MODULE_AUTHOR("Dmitry Baryshkov");
199	MODULE_LICENSE("GPL v2");
200	MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
201