[mirror_ubuntu-artful-kernel.git] / drivers / video / backlight / tosa_lcd.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/slab.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/lcd.h>
#include <linux/fb.h>

#include <asm/mach/sharpsl_param.h>

#include <mach/tosa.h>

#define POWER_IS_ON(pwr)	((pwr) <= FB_BLANK_NORMAL)

#define TG_REG0_VQV	0x0001
#define TG_REG0_COLOR	0x0002
#define TG_REG0_UD	0x0004
#define TG_REG0_LR	0x0008

#define	DAC_BASE	0x4e

struct tosa_lcd_data {
	struct spi_device *spi;
	struct lcd_device *lcd;
	struct i2c_client *i2c;

	int lcd_power;
	bool is_vga;
};

static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
{
	u8 buf[1];
	struct spi_message msg;
	struct spi_transfer xfer = {
		.len		= 1,
		.cs_change	= 1,
		.tx_buf		= buf,
	};

	buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	return spi_sync(spi, &msg);
}

int tosa_bl_enable(struct spi_device *spi, int enable)
{
	/* bl_enable GP04=1 otherwise GP04=0*/
	return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00);
}
EXPORT_SYMBOL(tosa_bl_enable);

static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
{
	/* TG on */
	gpio_set_value(TOSA_GPIO_TG_ON, 0);

	mdelay(60);

	/* delayed 0clk TCTL signal for VGA */
	tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
	/* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
	tosa_tg_send(data->spi, TG_GPOSR, 0x02);
}

static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
{
	struct spi_device *spi = data->spi;
	int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;

	if (data->is_vga)
		value |= TG_REG0_VQV;

	tosa_tg_send(spi, TG_PNLCTL, value);

	/* TG LCD pannel power up */
	tosa_tg_send(spi, TG_PINICTL,0x4);
	mdelay(50);

	/* TG LCD GVSS */
	tosa_tg_send(spi, TG_PINICTL,0x0);

	if (!data->i2c) {
		/* after the pannel is powered up the first time, we can access the i2c bus */
		/* so probe for the DAC */
		struct i2c_adapter *adap = i2c_get_adapter(0);
		struct i2c_board_info info = {
			.type	= "tosa-bl",
			.addr	= DAC_BASE,
			.platform_data = data->spi,
		};
		data->i2c = i2c_new_device(adap, &info);
	}
}

static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
{
	struct spi_device *spi = data->spi;

	/* TG LCD VHSA off */
	tosa_tg_send(spi, TG_PINICTL,0x4);
	mdelay(50);

	/* TG LCD signal off */
	tosa_tg_send(spi, TG_PINICTL,0x6);
	mdelay(50);

	/* TG Off */
	gpio_set_value(TOSA_GPIO_TG_ON, 1);
	mdelay(100);
}

int tosa_lcd_set_power(struct lcd_device *lcd, int power)
{
	struct tosa_lcd_data *data = lcd_get_data(lcd);

	if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
		tosa_lcd_tg_on(data);

	if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
		tosa_lcd_tg_off(data);

	data->lcd_power = power;
	return 0;
}

static int tosa_lcd_get_power(struct lcd_device *lcd)
{
	struct tosa_lcd_data *data = lcd_get_data(lcd);

	return data->lcd_power;
}

static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
{
	struct tosa_lcd_data *data = lcd_get_data(lcd);

	if (mode->xres == 320 || mode->yres == 320)
		data->is_vga = false;
	else
		data->is_vga = true;

	if (POWER_IS_ON(data->lcd_power))
		tosa_lcd_tg_on(data);

	return 0;
}

static struct lcd_ops tosa_lcd_ops = {
	.set_power = tosa_lcd_set_power,
	.get_power = tosa_lcd_get_power,
	.set_mode = tosa_lcd_set_mode,
};

static int __devinit tosa_lcd_probe(struct spi_device *spi)
{
	int ret;
	struct tosa_lcd_data *data;

	data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->is_vga = true; /* default to VGA mode */

	/*
	 * bits_per_word cannot be configured in platform data
	 */
	spi->bits_per_word = 8;

	ret = spi_setup(spi);
	if (ret < 0)
		goto err_spi;

	data->spi = spi;
	dev_set_drvdata(&spi->dev, data);

	ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr");
	if (ret < 0)
		goto err_gpio_tg;

	mdelay(60);

	ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0);
	if (ret < 0)
		goto err_gpio_dir;

	mdelay(60);
	tosa_lcd_tg_init(data);

	tosa_lcd_tg_on(data);

	data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data,
			&tosa_lcd_ops);

	if (IS_ERR(data->lcd)) {
		ret = PTR_ERR(data->lcd);
		data->lcd = NULL;
		goto err_register;
	}

	return 0;

err_register:
	tosa_lcd_tg_off(data);
err_gpio_dir:
	gpio_free(TOSA_GPIO_TG_ON);
err_gpio_tg:
	dev_set_drvdata(&spi->dev, NULL);
err_spi:
	kfree(data);
	return ret;
}

static int __devexit tosa_lcd_remove(struct spi_device *spi)
{
	struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);

	lcd_device_unregister(data->lcd);

	if (data->i2c)
		i2c_unregister_device(data->i2c);

	tosa_lcd_tg_off(data);

	gpio_free(TOSA_GPIO_TG_ON);
	dev_set_drvdata(&spi->dev, NULL);
	kfree(data);

	return 0;
}

#ifdef CONFIG_PM
static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state)
{
	struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);

	tosa_lcd_tg_off(data);

	return 0;
}

static int tosa_lcd_resume(struct spi_device *spi)
{
	struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);

	tosa_lcd_tg_init(data);
	if (POWER_IS_ON(data->lcd_power))
		tosa_lcd_tg_on(data);
	else
		tosa_lcd_tg_off(data);

	return 0;
}
#else
#define tosa_lcd_suspend	NULL
#define tosa_lcd_reume NULL
#endif

static struct spi_driver tosa_lcd_driver = {
	.driver = {
		.name		= "tosa-lcd",
		.owner		= THIS_MODULE,
	},
	.probe		= tosa_lcd_probe,
	.remove		= __devexit_p(tosa_lcd_remove),
	.suspend	= tosa_lcd_suspend,
	.resume		= tosa_lcd_resume,
};

static int __init tosa_lcd_init(void)
{
	return spi_register_driver(&tosa_lcd_driver);
}

static void __exit tosa_lcd_exit(void)
{
	spi_unregister_driver(&tosa_lcd_driver);
}

module_init(tosa_lcd_init);
module_exit(tosa_lcd_exit);

MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
MODULE_ALIAS("spi:tosa-lcd");
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>
5a0e3ad6	18	#include <linux/slab.h>
fbd1b17b DES	19	#include <linux/gpio.h>
	20	#include <linux/delay.h>
	21	#include <linux/lcd.h>
	22	#include <linux/fb.h>
	23
	24	#include <asm/mach/sharpsl_param.h>
	25
	26	#include <mach/tosa.h>
	27
	28	#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
	29
	30	#define TG_REG0_VQV 0x0001
	31	#define TG_REG0_COLOR 0x0002
	32	#define TG_REG0_UD 0x0004
	33	#define TG_REG0_LR 0x0008
	34
	35	#define DAC_BASE 0x4e
	36
	37	struct tosa_lcd_data {
	38	struct spi_device *spi;
	39	struct lcd_device *lcd;
	40	struct i2c_client *i2c;
	41
	42	int lcd_power;
0ec561f4	43	bool is_vga;
fbd1b17b DES	44	};
	45
	46	static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
	47	{
	48	u8 buf[1];
	49	struct spi_message msg;
	50	struct spi_transfer xfer = {
	51	.len = 1,
	52	.cs_change = 1,
	53	.tx_buf = buf,
	54	};
	55
	56	buf[0] = ((adrs & 0x07) << 5) \| (data & 0x1f);
	57	spi_message_init(&msg);
	58	spi_message_add_tail(&xfer, &msg);
	59
	60	return spi_sync(spi, &msg);
	61	}
	62
	63	int tosa_bl_enable(struct spi_device *spi, int enable)
	64	{
	65	/* bl_enable GP04=1 otherwise GP04=0*/
	66	return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00);
	67	}
	68	EXPORT_SYMBOL(tosa_bl_enable);
	69
	70	static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
	71	{
	72	/* TG on */
	73	gpio_set_value(TOSA_GPIO_TG_ON, 0);
	74
	75	mdelay(60);
	76
	77	/* delayed 0clk TCTL signal for VGA */
	78	tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
	79	/* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
	80	tosa_tg_send(data->spi, TG_GPOSR, 0x02);
	81	}
	82
	83	static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
	84	{
	85	struct spi_device *spi = data->spi;
0ec561f4 DES	86	int value = TG_REG0_COLOR \| TG_REG0_UD \| TG_REG0_LR;
	87
	88	if (data->is_vga)
	89	value \|= TG_REG0_VQV;
	90
	91	tosa_tg_send(spi, TG_PNLCTL, value);
fbd1b17b DES	92
	93	/* TG LCD pannel power up */
	94	tosa_tg_send(spi, TG_PINICTL,0x4);
	95	mdelay(50);
	96
	97	/* TG LCD GVSS */
	98	tosa_tg_send(spi, TG_PINICTL,0x0);
	99
	100	if (!data->i2c) {
	101	/* after the pannel is powered up the first time, we can access the i2c bus */
	102	/* so probe for the DAC */
	103	struct i2c_adapter *adap = i2c_get_adapter(0);
	104	struct i2c_board_info info = {
	105	.type = "tosa-bl",
	106	.addr = DAC_BASE,
	107	.platform_data = data->spi,
	108	};
	109	data->i2c = i2c_new_device(adap, &info);
	110	}
	111	}
	112
	113	static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
	114	{
	115	struct spi_device *spi = data->spi;
	116
	117	/* TG LCD VHSA off */
	118	tosa_tg_send(spi, TG_PINICTL,0x4);
	119	mdelay(50);
	120
	121	/* TG LCD signal off */
	122	tosa_tg_send(spi, TG_PINICTL,0x6);
	123	mdelay(50);
	124
	125	/* TG Off */
	126	gpio_set_value(TOSA_GPIO_TG_ON, 1);
	127	mdelay(100);
	128	}
	129
	130	int tosa_lcd_set_power(struct lcd_device *lcd, int power)
	131	{
	132	struct tosa_lcd_data *data = lcd_get_data(lcd);
	133
	134	if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
	135	tosa_lcd_tg_on(data);
	136
	137	if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
	138	tosa_lcd_tg_off(data);
	139
	140	data->lcd_power = power;
	141	return 0;
	142	}
	143
	144	static int tosa_lcd_get_power(struct lcd_device *lcd)
	145	{
	146	struct tosa_lcd_data *data = lcd_get_data(lcd);
	147
	148	return data->lcd_power;
	149	}
	150
0ec561f4 DES	151	static int tosa_lcd_set_mode(struct lcd_device lcd, struct fb_videomode mode)
	152	{
	153	struct tosa_lcd_data *data = lcd_get_data(lcd);
	154
	155	if (mode->xres == 320 \|\| mode->yres == 320)
	156	data->is_vga = false;
	157	else
	158	data->is_vga = true;
	159
	160	if (POWER_IS_ON(data->lcd_power))
	161	tosa_lcd_tg_on(data);
	162
	163	return 0;
	164	}
	165
fbd1b17b DES	166	static struct lcd_ops tosa_lcd_ops = {
	167	.set_power = tosa_lcd_set_power,
	168	.get_power = tosa_lcd_get_power,
0ec561f4	169	.set_mode = tosa_lcd_set_mode,
fbd1b17b DES	170	};
	171
	172	static int __devinit tosa_lcd_probe(struct spi_device *spi)
	173	{
	174	int ret;
	175	struct tosa_lcd_data *data;
	176
	177	data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL);
	178	if (!data)
	179	return -ENOMEM;
	180
af901ca1	181	data->is_vga = true; /* default to VGA mode */
0ec561f4	182
fbd1b17b DES	183	/*
	184	* bits_per_word cannot be configured in platform data
	185	*/
	186	spi->bits_per_word = 8;
	187
	188	ret = spi_setup(spi);
	189	if (ret < 0)
	190	goto err_spi;
	191
	192	data->spi = spi;
	193	dev_set_drvdata(&spi->dev, data);
	194
	195	ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr");
	196	if (ret < 0)
	197	goto err_gpio_tg;
	198
	199	mdelay(60);
	200
	201	ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0);
	202	if (ret < 0)
	203	goto err_gpio_dir;
	204
	205	mdelay(60);
	206	tosa_lcd_tg_init(data);
	207
	208	tosa_lcd_tg_on(data);
	209
	210	data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data,
	211	&tosa_lcd_ops);
	212
	213	if (IS_ERR(data->lcd)) {
	214	ret = PTR_ERR(data->lcd);
	215	data->lcd = NULL;
	216	goto err_register;
	217	}
	218
	219	return 0;
	220
	221	err_register:
	222	tosa_lcd_tg_off(data);
	223	err_gpio_dir:
	224	gpio_free(TOSA_GPIO_TG_ON);
	225	err_gpio_tg:
	226	dev_set_drvdata(&spi->dev, NULL);
	227	err_spi:
	228	kfree(data);
	229	return ret;
	230	}
	231
	232	static int __devexit tosa_lcd_remove(struct spi_device *spi)
	233	{
	234	struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
	235
	236	lcd_device_unregister(data->lcd);
	237
	238	if (data->i2c)
	239	i2c_unregister_device(data->i2c);
	240
	241	tosa_lcd_tg_off(data);
	242
	243	gpio_free(TOSA_GPIO_TG_ON);
	244	dev_set_drvdata(&spi->dev, NULL);
	245	kfree(data);
	246
247	return 0;
248	}
249
250	#ifdef CONFIG_PM
251	static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state)
252	{
253	struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
254
255	tosa_lcd_tg_off(data);
256
257	return 0;
258	}
259
260	static int tosa_lcd_resume(struct spi_device *spi)
261	{
262	struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
263
264	tosa_lcd_tg_init(data);
265	if (POWER_IS_ON(data->lcd_power))
266	tosa_lcd_tg_on(data);
267	else
268	tosa_lcd_tg_off(data);
269
270	return 0;
271	}
272	#else
273	#define tosa_lcd_suspend NULL
274	#define tosa_lcd_reume NULL
275	#endif
276
277	static struct spi_driver tosa_lcd_driver = {
278	.driver = {
279	.name = "tosa-lcd",
280	.owner = THIS_MODULE,
281	},
282	.probe = tosa_lcd_probe,
283	.remove = __devexit_p(tosa_lcd_remove),
284	.suspend = tosa_lcd_suspend,
285	.resume = tosa_lcd_resume,
286	};
287
288	static int __init tosa_lcd_init(void)
289	{
290	return spi_register_driver(&tosa_lcd_driver);
291	}
292
293	static void __exit tosa_lcd_exit(void)
294	{
295	spi_unregister_driver(&tosa_lcd_driver);
296	}
297
298	module_init(tosa_lcd_init);
299	module_exit(tosa_lcd_exit);
300
301	MODULE_AUTHOR("Dmitry Baryshkov");
302	MODULE_LICENSE("GPL v2");
303	MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
e0626e38	304	MODULE_ALIAS("spi:tosa-lcd");