[linux-2.6-block.git] / drivers / video / backlight / lms283gf05.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * lms283gf05.c -- support for Samsung LMS283GF05 LCD
 *
 * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <linux/lcd.h>

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

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

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(struct gpio_desc *gpiod)
{
	gpiod_set_value(gpiod, 0); /* De-asserted */
	mdelay(100);
	gpiod_set_value(gpiod, 1); /* Asserted */
	mdelay(20);
	gpiod_set_value(gpiod, 0); /* De-asserted */
	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;

	if (power <= FB_BLANK_NORMAL) {
		if (st->reset)
			lms283gf05_reset(st->reset);
		lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
	} else {
		lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
		if (st->reset)
			gpiod_set_value(st->reset, 1); /* Asserted */
	}

	return 0;
}

static const 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 lcd_device *ld;

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

	st->reset = gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(st->reset))
		return PTR_ERR(st->reset);
	gpiod_set_consumer_name(st->reset, "LMS283GF05 RESET");

	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 (st->reset)
		lms283gf05_reset(st->reset);
	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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
5036cc41 MV	2	/*
	3	* lms283gf05.c -- support for Samsung LMS283GF05 LCD
	4	*
	5	* Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
5036cc41 MV	6	*/
	7
	8	#include <linux/device.h>
	9	#include <linux/kernel.h>
	10	#include <linux/delay.h>
5a0e3ad6	11	#include <linux/slab.h>
93cc26fa	12	#include <linux/gpio/consumer.h>
5036cc41 MV	13	#include <linux/lcd.h>
	14
	15	#include <linux/spi/spi.h>
355b200b	16	#include <linux/module.h>
5036cc41 MV	17
	18	struct lms283gf05_state {
	19	struct spi_device *spi;
	20	struct lcd_device *ld;
93cc26fa	21	struct gpio_desc *reset;
5036cc41 MV	22	};
	23
	24	struct lms283gf05_seq {
	25	unsigned char reg;
	26	unsigned short value;
	27	unsigned char delay;
	28	};
	29
	30	/* Magic sequences supplied by manufacturer, for details refer to datasheet */
c22e61b3	31	static const struct lms283gf05_seq disp_initseq[] = {
5036cc41 MV	32	/* REG, VALUE, DELAY */
	33	{ 0x07, 0x0000, 0 },
	34	{ 0x13, 0x0000, 10 },
	35
	36	{ 0x11, 0x3004, 0 },
	37	{ 0x14, 0x200F, 0 },
	38	{ 0x10, 0x1a20, 0 },
	39	{ 0x13, 0x0040, 50 },
	40
	41	{ 0x13, 0x0060, 0 },
	42	{ 0x13, 0x0070, 200 },
	43
	44	{ 0x01, 0x0127, 0 },
	45	{ 0x02, 0x0700, 0 },
	46	{ 0x03, 0x1030, 0 },
	47	{ 0x08, 0x0208, 0 },
	48	{ 0x0B, 0x0620, 0 },
	49	{ 0x0C, 0x0110, 0 },
	50	{ 0x30, 0x0120, 0 },
	51	{ 0x31, 0x0127, 0 },
	52	{ 0x32, 0x0000, 0 },
	53	{ 0x33, 0x0503, 0 },
	54	{ 0x34, 0x0727, 0 },
	55	{ 0x35, 0x0124, 0 },
	56	{ 0x36, 0x0706, 0 },
	57	{ 0x37, 0x0701, 0 },
	58	{ 0x38, 0x0F00, 0 },
	59	{ 0x39, 0x0F00, 0 },
	60	{ 0x40, 0x0000, 0 },
	61	{ 0x41, 0x0000, 0 },
	62	{ 0x42, 0x013f, 0 },
	63	{ 0x43, 0x0000, 0 },
	64	{ 0x44, 0x013f, 0 },
	65	{ 0x45, 0x0000, 0 },
	66	{ 0x46, 0xef00, 0 },
	67	{ 0x47, 0x013f, 0 },
	68	{ 0x48, 0x0000, 0 },
	69	{ 0x07, 0x0015, 30 },
	70
	71	{ 0x07, 0x0017, 0 },
	72
	73	{ 0x20, 0x0000, 0 },
	74	{ 0x21, 0x0000, 0 },
	75	{ 0x22, 0x0000, 0 }
	76	};
	77
c22e61b3	78	static const struct lms283gf05_seq disp_pdwnseq[] = {
5036cc41 MV	79	{ 0x07, 0x0016, 30 },
	80
	81	{ 0x07, 0x0004, 0 },
	82	{ 0x10, 0x0220, 20 },
	83
	84	{ 0x13, 0x0060, 50 },
	85
	86	{ 0x13, 0x0040, 50 },
	87
	88	{ 0x13, 0x0000, 0 },
	89	{ 0x10, 0x0000, 0 }
	90	};
	91
	92
93cc26fa	93	static void lms283gf05_reset(struct gpio_desc *gpiod)
5036cc41	94	{
93cc26fa	95	gpiod_set_value(gpiod, 0); /* De-asserted */
5036cc41	96	mdelay(100);
93cc26fa	97	gpiod_set_value(gpiod, 1); /* Asserted */
5036cc41	98	mdelay(20);
93cc26fa	99	gpiod_set_value(gpiod, 0); /* De-asserted */
5036cc41 MV	100	mdelay(20);
	101	}
	102
	103	static void lms283gf05_toggle(struct spi_device *spi,
c22e61b3	104	const struct lms283gf05_seq *seq, int sz)
5036cc41 MV	105	{
	106	char buf[3];
	107	int i;
	108
	109	for (i = 0; i < sz; i++) {
	110	buf[0] = 0x74;
	111	buf[1] = 0x00;
	112	buf[2] = seq[i].reg;
	113	spi_write(spi, buf, 3);
	114
	115	buf[0] = 0x76;
	116	buf[1] = seq[i].value >> 8;
	117	buf[2] = seq[i].value & 0xff;
	118	spi_write(spi, buf, 3);
	119
	120	mdelay(seq[i].delay);
	121	}
	122	}
	123
	124	static int lms283gf05_power_set(struct lcd_device *ld, int power)
	125	{
	126	struct lms283gf05_state *st = lcd_get_data(ld);
	127	struct spi_device *spi = st->spi;
5036cc41	128
6bde9082	129	if (power <= FB_BLANK_NORMAL) {
93cc26fa LW	130	if (st->reset)
93cc26fa LW	131	lms283gf05_reset(st->reset);
5036cc41 MV	132	lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
	133	} else {
	134	lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
93cc26fa LW	135	if (st->reset)
93cc26fa LW	136	gpiod_set_value(st->reset, 1); /* Asserted */
5036cc41 MV	137	}
	138
	139	return 0;
	140	}
	141
7ae6431a	142	static const struct lcd_ops lms_ops = {
5036cc41 MV	143	.set_power = lms283gf05_power_set,
	144	.get_power = NULL,
	145	};
	146
1b9e450d	147	static int lms283gf05_probe(struct spi_device *spi)
5036cc41 MV	148	{
5036cc41 MV	149	struct lms283gf05_state *st;
5036cc41	150	struct lcd_device *ld;
5036cc41	151
26f2b35c JH	152	st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),
26f2b35c JH	153	GFP_KERNEL);
e1094f9f	154	if (st == NULL)
04e961fb	155	return -ENOMEM;
5036cc41	156
93cc26fa LW	157	st->reset = gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
	158	if (IS_ERR(st->reset))
	159	return PTR_ERR(st->reset);
	160	gpiod_set_consumer_name(st->reset, "LMS283GF05 RESET");
	161
0a1c55d0 JH	162	ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st,
0a1c55d0 JH	163	&lms_ops);
04e961fb JH	164	if (IS_ERR(ld))
04e961fb JH	165	return PTR_ERR(ld);
5036cc41 MV	166
	167	st->spi = spi;
	168	st->ld = ld;
	169
b936fab0	170	spi_set_drvdata(spi, st);
5036cc41 MV	171
5036cc41 MV	172	/* kick in the LCD */
93cc26fa LW	173	if (st->reset)
93cc26fa LW	174	lms283gf05_reset(st->reset);
5036cc41 MV	175	lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
	176
	177	return 0;
5036cc41 MV	178	}
5036cc41 MV	179
5036cc41 MV	180	static struct spi_driver lms283gf05_driver = {
	181	.driver = {
	182	.name = "lms283gf05",
5036cc41 MV	183	},
5036cc41 MV	184	.probe = lms283gf05_probe,
5036cc41 MV	185	};
5036cc41 MV	186
462dd838	187	module_spi_driver(lms283gf05_driver);
5036cc41 MV	188
	189	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
	190	MODULE_DESCRIPTION("LCD283GF05 LCD");
	191	MODULE_LICENSE("GPL v2");