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