[deliverable/linux.git] / drivers / video / backlight / lms283gf05.c

/*
 * lms283gf05.c -- support for Samsung LMS283GF05 LCD
 *
 * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
 *
 * 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/device.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/lcd.h>

#include <linux/spi/spi.h>
#include <linux/spi/lms283gf05.h>
#include <linux/module.h>

struct lms283gf05_state {
	struct spi_device	*spi;
	struct lcd_device	*ld;
};

struct lms283gf05_seq {
	unsigned char		reg;
	unsigned short		value;
	unsigned char		delay;
};

/* Magic sequences supplied by manufacturer, for details refer to datasheet */
static const struct lms283gf05_seq disp_initseq[] = {
	/* REG, VALUE, DELAY */
	{ 0x07, 0x0000, 0 },
	{ 0x13, 0x0000, 10 },

	{ 0x11, 0x3004, 0 },
	{ 0x14, 0x200F, 0 },
	{ 0x10, 0x1a20, 0 },
	{ 0x13, 0x0040, 50 },

	{ 0x13, 0x0060, 0 },
	{ 0x13, 0x0070, 200 },

	{ 0x01, 0x0127, 0 },
	{ 0x02,	0x0700, 0 },
	{ 0x03, 0x1030, 0 },
	{ 0x08, 0x0208, 0 },
	{ 0x0B, 0x0620, 0 },
	{ 0x0C, 0x0110, 0 },
	{ 0x30, 0x0120, 0 },
	{ 0x31, 0x0127, 0 },
	{ 0x32, 0x0000, 0 },
	{ 0x33, 0x0503, 0 },
	{ 0x34, 0x0727, 0 },
	{ 0x35, 0x0124, 0 },
	{ 0x36, 0x0706, 0 },
	{ 0x37, 0x0701, 0 },
	{ 0x38, 0x0F00, 0 },
	{ 0x39, 0x0F00, 0 },
	{ 0x40, 0x0000, 0 },
	{ 0x41, 0x0000, 0 },
	{ 0x42, 0x013f, 0 },
	{ 0x43, 0x0000, 0 },
	{ 0x44, 0x013f, 0 },
	{ 0x45, 0x0000, 0 },
	{ 0x46, 0xef00, 0 },
	{ 0x47, 0x013f, 0 },
	{ 0x48, 0x0000, 0 },
	{ 0x07, 0x0015, 30 },

	{ 0x07, 0x0017, 0 },

	{ 0x20, 0x0000, 0 },
	{ 0x21, 0x0000, 0 },
	{ 0x22, 0x0000, 0 }
};

static const struct lms283gf05_seq disp_pdwnseq[] = {
	{ 0x07, 0x0016, 30 },

	{ 0x07, 0x0004, 0 },
	{ 0x10, 0x0220, 20 },

	{ 0x13, 0x0060, 50 },

	{ 0x13, 0x0040, 50 },

	{ 0x13, 0x0000, 0 },
	{ 0x10, 0x0000, 0 }
};


static void lms283gf05_reset(unsigned long gpio, bool inverted)
{
	gpio_set_value(gpio, !inverted);
	mdelay(100);
	gpio_set_value(gpio, inverted);
	mdelay(20);
	gpio_set_value(gpio, !inverted);
	mdelay(20);
}

static void lms283gf05_toggle(struct spi_device *spi,
				const struct lms283gf05_seq *seq, int sz)
{
	char buf[3];
	int i;

	for (i = 0; i < sz; i++) {
		buf[0] = 0x74;
		buf[1] = 0x00;
		buf[2] = seq[i].reg;
		spi_write(spi, buf, 3);

		buf[0] = 0x76;
		buf[1] = seq[i].value >> 8;
		buf[2] = seq[i].value & 0xff;
		spi_write(spi, buf, 3);

		mdelay(seq[i].delay);
	}
}

static int lms283gf05_power_set(struct lcd_device *ld, int power)
{
	struct lms283gf05_state *st = lcd_get_data(ld);
	struct spi_device *spi = st->spi;
	struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);

	if (power <= FB_BLANK_NORMAL) {
		if (pdata)
			lms283gf05_reset(pdata->reset_gpio,
					pdata->reset_inverted);
		lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
	} else {
		lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
		if (pdata)
			gpio_set_value(pdata->reset_gpio,
					pdata->reset_inverted);
	}

	return 0;
}

static struct lcd_ops lms_ops = {
	.set_power	= lms283gf05_power_set,
	.get_power	= NULL,
};

static int lms283gf05_probe(struct spi_device *spi)
{
	struct lms283gf05_state *st;
	struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
	struct lcd_device *ld;
	int ret = 0;

	if (pdata != NULL) {
		ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
				GPIOF_DIR_OUT | (!pdata->reset_inverted ?
				GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
				"LMS285GF05 RESET");
		if (ret)
			return ret;
	}

	st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),
				GFP_KERNEL);
	if (st == NULL)
		return -ENOMEM;

	ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st,
					&lms_ops);
	if (IS_ERR(ld))
		return PTR_ERR(ld);

	st->spi = spi;
	st->ld = ld;

	spi_set_drvdata(spi, st);

	/* kick in the LCD */
	if (pdata)
		lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
	lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));

	return 0;
}

static struct spi_driver lms283gf05_driver = {
	.driver = {
		.name	= "lms283gf05",
	},
	.probe		= lms283gf05_probe,
};

module_spi_driver(lms283gf05_driver);

MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("LCD283GF05 LCD");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
5036cc41 MV	1	/*
	2	* lms283gf05.c -- support for Samsung LMS283GF05 LCD
	3	*
	4	* Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/device.h>
	12	#include <linux/kernel.h>
	13	#include <linux/delay.h>
5a0e3ad6	14	#include <linux/slab.h>
5036cc41 MV	15	#include <linux/gpio.h>
	16	#include <linux/lcd.h>
	17
	18	#include <linux/spi/spi.h>
	19	#include <linux/spi/lms283gf05.h>
355b200b	20	#include <linux/module.h>
5036cc41 MV	21
	22	struct lms283gf05_state {
	23	struct spi_device *spi;
	24	struct lcd_device *ld;
	25	};
	26
	27	struct lms283gf05_seq {
	28	unsigned char reg;
	29	unsigned short value;
	30	unsigned char delay;
	31	};
	32
	33	/* Magic sequences supplied by manufacturer, for details refer to datasheet */
c22e61b3	34	static const struct lms283gf05_seq disp_initseq[] = {
5036cc41 MV	35	/* REG, VALUE, DELAY */
	36	{ 0x07, 0x0000, 0 },
	37	{ 0x13, 0x0000, 10 },
	38
	39	{ 0x11, 0x3004, 0 },
	40	{ 0x14, 0x200F, 0 },
	41	{ 0x10, 0x1a20, 0 },
	42	{ 0x13, 0x0040, 50 },
	43
	44	{ 0x13, 0x0060, 0 },
	45	{ 0x13, 0x0070, 200 },
	46
	47	{ 0x01, 0x0127, 0 },
	48	{ 0x02, 0x0700, 0 },
	49	{ 0x03, 0x1030, 0 },
	50	{ 0x08, 0x0208, 0 },
	51	{ 0x0B, 0x0620, 0 },
	52	{ 0x0C, 0x0110, 0 },
	53	{ 0x30, 0x0120, 0 },
	54	{ 0x31, 0x0127, 0 },
	55	{ 0x32, 0x0000, 0 },
	56	{ 0x33, 0x0503, 0 },
	57	{ 0x34, 0x0727, 0 },
	58	{ 0x35, 0x0124, 0 },
	59	{ 0x36, 0x0706, 0 },
	60	{ 0x37, 0x0701, 0 },
	61	{ 0x38, 0x0F00, 0 },
	62	{ 0x39, 0x0F00, 0 },
	63	{ 0x40, 0x0000, 0 },
	64	{ 0x41, 0x0000, 0 },
	65	{ 0x42, 0x013f, 0 },
	66	{ 0x43, 0x0000, 0 },
	67	{ 0x44, 0x013f, 0 },
	68	{ 0x45, 0x0000, 0 },
	69	{ 0x46, 0xef00, 0 },
	70	{ 0x47, 0x013f, 0 },
	71	{ 0x48, 0x0000, 0 },
	72	{ 0x07, 0x0015, 30 },
	73
	74	{ 0x07, 0x0017, 0 },
	75
	76	{ 0x20, 0x0000, 0 },
	77	{ 0x21, 0x0000, 0 },
	78	{ 0x22, 0x0000, 0 }
	79	};
	80
c22e61b3	81	static const struct lms283gf05_seq disp_pdwnseq[] = {
5036cc41 MV	82	{ 0x07, 0x0016, 30 },
	83
	84	{ 0x07, 0x0004, 0 },
	85	{ 0x10, 0x0220, 20 },
	86
	87	{ 0x13, 0x0060, 50 },
	88
	89	{ 0x13, 0x0040, 50 },
	90
	91	{ 0x13, 0x0000, 0 },
	92	{ 0x10, 0x0000, 0 }
	93	};
	94
	95
	96	static void lms283gf05_reset(unsigned long gpio, bool inverted)
	97	{
	98	gpio_set_value(gpio, !inverted);
	99	mdelay(100);
	100	gpio_set_value(gpio, inverted);
	101	mdelay(20);
	102	gpio_set_value(gpio, !inverted);
	103	mdelay(20);
	104	}
	105
	106	static void lms283gf05_toggle(struct spi_device *spi,
c22e61b3	107	const struct lms283gf05_seq *seq, int sz)
5036cc41 MV	108	{
	109	char buf[3];
	110	int i;
	111
	112	for (i = 0; i < sz; i++) {
	113	buf[0] = 0x74;
	114	buf[1] = 0x00;
	115	buf[2] = seq[i].reg;
	116	spi_write(spi, buf, 3);
	117
	118	buf[0] = 0x76;
	119	buf[1] = seq[i].value >> 8;
	120	buf[2] = seq[i].value & 0xff;
	121	spi_write(spi, buf, 3);
	122
	123	mdelay(seq[i].delay);
	124	}
	125	}
	126
	127	static int lms283gf05_power_set(struct lcd_device *ld, int power)
	128	{
	129	struct lms283gf05_state *st = lcd_get_data(ld);
	130	struct spi_device *spi = st->spi;
c512794c	131	struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
5036cc41	132
6bde9082	133	if (power <= FB_BLANK_NORMAL) {
5036cc41 MV	134	if (pdata)
	135	lms283gf05_reset(pdata->reset_gpio,
	136	pdata->reset_inverted);
	137	lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
	138	} else {
	139	lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
	140	if (pdata)
	141	gpio_set_value(pdata->reset_gpio,
	142	pdata->reset_inverted);
	143	}
	144
	145	return 0;
	146	}
	147
	148	static struct lcd_ops lms_ops = {
	149	.set_power = lms283gf05_power_set,
	150	.get_power = NULL,
	151	};
	152
1b9e450d	153	static int lms283gf05_probe(struct spi_device *spi)
5036cc41 MV	154	{
5036cc41 MV	155	struct lms283gf05_state *st;
c512794c	156	struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
5036cc41 MV	157	struct lcd_device *ld;
	158	int ret = 0;
	159
	160	if (pdata != NULL) {
5a5a0743	161	ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
1eddd977 JH	162	GPIOF_DIR_OUT \| (!pdata->reset_inverted ?
1eddd977 JH	163	GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
5a5a0743	164	"LMS285GF05 RESET");
5036cc41	165	if (ret)
04e961fb	166	return ret;
5036cc41 MV	167	}
5036cc41 MV	168
26f2b35c JH	169	st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),
26f2b35c JH	170	GFP_KERNEL);
e1094f9f	171	if (st == NULL)
04e961fb	172	return -ENOMEM;
5036cc41	173
0a1c55d0 JH	174	ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st,
0a1c55d0 JH	175	&lms_ops);
04e961fb JH	176	if (IS_ERR(ld))
04e961fb JH	177	return PTR_ERR(ld);
5036cc41 MV	178
	179	st->spi = spi;
	180	st->ld = ld;
	181
b936fab0	182	spi_set_drvdata(spi, st);
5036cc41 MV	183
	184	/* kick in the LCD */
	185	if (pdata)
	186	lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
	187	lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
	188
	189	return 0;
5036cc41 MV	190	}
5036cc41 MV	191
5036cc41 MV	192	static struct spi_driver lms283gf05_driver = {
	193	.driver = {
	194	.name = "lms283gf05",
5036cc41 MV	195	},
5036cc41 MV	196	.probe = lms283gf05_probe,
5036cc41 MV	197	};
5036cc41 MV	198
462dd838	199	module_spi_driver(lms283gf05_driver);
5036cc41 MV	200
	201	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
	202	MODULE_DESCRIPTION("LCD283GF05 LCD");
	203	MODULE_LICENSE("GPL v2");