[deliverable/linux.git] / drivers / video / backlight / l4f00242t03.c

/*
 * l4f00242t03.c -- support for Epson L4F00242T03 LCD
 *
 * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * Copyright (c) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
 *	Inspired by Marek Vasut work in l4f00242t03.c
 *
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

#include <linux/spi/spi.h>
#include <linux/spi/l4f00242t03.h>

struct l4f00242t03_priv {
	struct spi_device	*spi;
	struct lcd_device	*ld;
	int lcd_state;
	struct regulator *io_reg;
	struct regulator *core_reg;
};

static void l4f00242t03_reset(unsigned int gpio)
{
	pr_debug("l4f00242t03_reset.\n");
	gpio_set_value(gpio, 1);
	mdelay(100);
	gpio_set_value(gpio, 0);
	mdelay(10);	/* tRES >= 100us */
	gpio_set_value(gpio, 1);
	mdelay(20);
}

#define param(x) ((x) | 0x100)

static void l4f00242t03_lcd_init(struct spi_device *spi)
{
	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
	const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };

	dev_dbg(&spi->dev, "initializing LCD\n");

	regulator_set_voltage(priv->io_reg, 1800000, 1800000);
	regulator_enable(priv->io_reg);

	regulator_set_voltage(priv->core_reg, 2800000, 2800000);
	regulator_enable(priv->core_reg);

	l4f00242t03_reset(pdata->reset_gpio);

	gpio_set_value(pdata->data_enable_gpio, 1);
	msleep(60);
	spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16));
}

static void l4f00242t03_lcd_powerdown(struct spi_device *spi)
{
	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);

	dev_dbg(&spi->dev, "Powering down LCD\n");

	gpio_set_value(pdata->data_enable_gpio, 0);

	regulator_disable(priv->io_reg);
	regulator_disable(priv->core_reg);
}

static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
{
	struct l4f00242t03_priv *priv = lcd_get_data(ld);

	return priv->lcd_state;
}

static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
{
	struct l4f00242t03_priv *priv = lcd_get_data(ld);
	struct spi_device *spi = priv->spi;

	const u16 slpout = 0x11;
	const u16 dison = 0x29;

	const u16 slpin = 0x10;
	const u16 disoff = 0x28;

	if (power <= FB_BLANK_NORMAL) {
		if (priv->lcd_state <= FB_BLANK_NORMAL) {
			/* Do nothing, the LCD is running */
		} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
			dev_dbg(&spi->dev, "Resuming LCD\n");

			spi_write(spi, (const u8 *)&slpout, sizeof(u16));
			msleep(60);
			spi_write(spi, (const u8 *)&dison, sizeof(u16));
		} else {
			/* priv->lcd_state == FB_BLANK_POWERDOWN */
			l4f00242t03_lcd_init(spi);
			priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
			l4f00242t03_lcd_power_set(priv->ld, power);
		}
	} else if (power < FB_BLANK_POWERDOWN) {
		if (priv->lcd_state <= FB_BLANK_NORMAL) {
			/* Send the display in standby */
			dev_dbg(&spi->dev, "Standby the LCD\n");

			spi_write(spi, (const u8 *)&disoff, sizeof(u16));
			msleep(60);
			spi_write(spi, (const u8 *)&slpin, sizeof(u16));
		} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
			/* Do nothing, the LCD is already in standby */
		} else {
			/* priv->lcd_state == FB_BLANK_POWERDOWN */
			l4f00242t03_lcd_init(spi);
			priv->lcd_state = FB_BLANK_UNBLANK;
			l4f00242t03_lcd_power_set(ld, power);
		}
	} else {
		/* power == FB_BLANK_POWERDOWN */
		if (priv->lcd_state != FB_BLANK_POWERDOWN) {
			/* Clear the screen before shutting down */
			spi_write(spi, (const u8 *)&disoff, sizeof(u16));
			msleep(60);
			l4f00242t03_lcd_powerdown(spi);
		}
	}

	priv->lcd_state = power;

	return 0;
}

static struct lcd_ops l4f_ops = {
	.set_power	= l4f00242t03_lcd_power_set,
	.get_power	= l4f00242t03_lcd_power_get,
};

static int l4f00242t03_probe(struct spi_device *spi)
{
	struct l4f00242t03_priv *priv;
	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	int ret;

	if (pdata == NULL) {
		dev_err(&spi->dev, "Uninitialized platform data.\n");
		return -EINVAL;
	}

	priv = devm_kzalloc(&spi->dev, sizeof(struct l4f00242t03_priv),
				GFP_KERNEL);

	if (priv == NULL) {
		dev_err(&spi->dev, "No memory for this device.\n");
		return -ENOMEM;
	}

	spi_set_drvdata(spi, priv);
	spi->bits_per_word = 9;
	spi_setup(spi);

	priv->spi = spi;

	ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
			GPIOF_OUT_INIT_HIGH, "lcd l4f00242t03 reset");
	if (ret) {
		dev_err(&spi->dev,
			"Unable to get the lcd l4f00242t03 reset gpio.\n");
		return ret;
	}

	ret = devm_gpio_request_one(&spi->dev, pdata->data_enable_gpio,
			GPIOF_OUT_INIT_LOW, "lcd l4f00242t03 data enable");
	if (ret) {
		dev_err(&spi->dev,
			"Unable to get the lcd l4f00242t03 data en gpio.\n");
		return ret;
	}

	priv->io_reg = devm_regulator_get(&spi->dev, "vdd");
	if (IS_ERR(priv->io_reg)) {
		dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
		       __func__);
		return PTR_ERR(priv->io_reg);
	}

	priv->core_reg = devm_regulator_get(&spi->dev, "vcore");
	if (IS_ERR(priv->core_reg)) {
		dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
		       __func__);
		return PTR_ERR(priv->core_reg);
	}

	priv->ld = lcd_device_register("l4f00242t03",
					&spi->dev, priv, &l4f_ops);
	if (IS_ERR(priv->ld))
		return PTR_ERR(priv->ld);

	/* Init the LCD */
	l4f00242t03_lcd_init(spi);
	priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);

	dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");

	return 0;
}

static int l4f00242t03_remove(struct spi_device *spi)
{
	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);

	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
	lcd_device_unregister(priv->ld);
	spi_set_drvdata(spi, NULL);

	return 0;
}

static void l4f00242t03_shutdown(struct spi_device *spi)
{
	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);

	if (priv)
		l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);

}

static struct spi_driver l4f00242t03_driver = {
	.driver = {
		.name	= "l4f00242t03",
		.owner	= THIS_MODULE,
	},
	.probe		= l4f00242t03_probe,
	.remove		= l4f00242t03_remove,
	.shutdown	= l4f00242t03_shutdown,
};

module_spi_driver(l4f00242t03_driver);

MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
e7fb9c4a AP	1	/*
	2	* l4f00242t03.c -- support for Epson L4F00242T03 LCD
	3	*
	4	* Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
	5	*
	6	* Copyright (c) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
e4f8ae70	7	* Inspired by Marek Vasut work in l4f00242t03.c
e7fb9c4a AP	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
6677110b JH	14	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6677110b JH	15
e7fb9c4a AP	16	#include <linux/device.h>
	17	#include <linux/kernel.h>
	18	#include <linux/delay.h>
355b200b	19	#include <linux/module.h>
e7fb9c4a AP	20	#include <linux/gpio.h>
e7fb9c4a AP	21	#include <linux/lcd.h>
5a0e3ad6	22	#include <linux/slab.h>
e7fb9c4a AP	23	#include <linux/regulator/consumer.h>
	24
	25	#include <linux/spi/spi.h>
	26	#include <linux/spi/l4f00242t03.h>
	27
	28	struct l4f00242t03_priv {
	29	struct spi_device *spi;
	30	struct lcd_device *ld;
95558ad1	31	int lcd_state;
e7fb9c4a AP	32	struct regulator *io_reg;
	33	struct regulator *core_reg;
	34	};
	35
e7fb9c4a AP	36	static void l4f00242t03_reset(unsigned int gpio)
	37	{
	38	pr_debug("l4f00242t03_reset.\n");
	39	gpio_set_value(gpio, 1);
	40	mdelay(100);
	41	gpio_set_value(gpio, 0);
	42	mdelay(10); /* tRES >= 100us */
	43	gpio_set_value(gpio, 1);
	44	mdelay(20);
	45	}
	46
	47	#define param(x) ((x) \| 0x100)
	48
	49	static void l4f00242t03_lcd_init(struct spi_device *spi)
	50	{
	51	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
60066078	52	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
e7fb9c4a AP	53	const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };
	54
	55	dev_dbg(&spi->dev, "initializing LCD\n");
	56
0556dc34 MB	57	regulator_set_voltage(priv->io_reg, 1800000, 1800000);
0556dc34 MB	58	regulator_enable(priv->io_reg);
e7fb9c4a	59
0556dc34 MB	60	regulator_set_voltage(priv->core_reg, 2800000, 2800000);
0556dc34 MB	61	regulator_enable(priv->core_reg);
e7fb9c4a	62
aff5ce6c AP	63	l4f00242t03_reset(pdata->reset_gpio);
aff5ce6c AP	64
e7fb9c4a AP	65	gpio_set_value(pdata->data_enable_gpio, 1);
	66	msleep(60);
	67	spi_write(spi, (const u8 )cmd, ARRAY_SIZE(cmd) sizeof(u16));
	68	}
	69
95558ad1 AP	70	static void l4f00242t03_lcd_powerdown(struct spi_device *spi)
	71	{
	72	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
60066078	73	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
95558ad1 AP	74
	75	dev_dbg(&spi->dev, "Powering down LCD\n");
	76
	77	gpio_set_value(pdata->data_enable_gpio, 0);
	78
0556dc34 MB	79	regulator_disable(priv->io_reg);
0556dc34 MB	80	regulator_disable(priv->core_reg);
95558ad1 AP	81	}
	82
	83	static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
	84	{
	85	struct l4f00242t03_priv *priv = lcd_get_data(ld);
	86
	87	return priv->lcd_state;
	88	}
	89
e7fb9c4a AP	90	static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
	91	{
	92	struct l4f00242t03_priv *priv = lcd_get_data(ld);
	93	struct spi_device *spi = priv->spi;
	94
	95	const u16 slpout = 0x11;
	96	const u16 dison = 0x29;
	97
	98	const u16 slpin = 0x10;
	99	const u16 disoff = 0x28;
	100
4dbdf886	101	if (power <= FB_BLANK_NORMAL) {
95558ad1 AP	102	if (priv->lcd_state <= FB_BLANK_NORMAL) {
	103	/* Do nothing, the LCD is running */
	104	} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
	105	dev_dbg(&spi->dev, "Resuming LCD\n");
	106
	107	spi_write(spi, (const u8 *)&slpout, sizeof(u16));
	108	msleep(60);
	109	spi_write(spi, (const u8 *)&dison, sizeof(u16));
	110	} else {
	111	/* priv->lcd_state == FB_BLANK_POWERDOWN */
	112	l4f00242t03_lcd_init(spi);
	113	priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
	114	l4f00242t03_lcd_power_set(priv->ld, power);
	115	}
	116	} else if (power < FB_BLANK_POWERDOWN) {
	117	if (priv->lcd_state <= FB_BLANK_NORMAL) {
	118	/* Send the display in standby */
	119	dev_dbg(&spi->dev, "Standby the LCD\n");
	120
	121	spi_write(spi, (const u8 *)&disoff, sizeof(u16));
	122	msleep(60);
	123	spi_write(spi, (const u8 *)&slpin, sizeof(u16));
	124	} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
	125	/* Do nothing, the LCD is already in standby */
	126	} else {
	127	/* priv->lcd_state == FB_BLANK_POWERDOWN */
	128	l4f00242t03_lcd_init(spi);
	129	priv->lcd_state = FB_BLANK_UNBLANK;
	130	l4f00242t03_lcd_power_set(ld, power);
	131	}
e7fb9c4a	132	} else {
95558ad1	133	/* power == FB_BLANK_POWERDOWN */
26bbabc8 AP	134	if (priv->lcd_state != FB_BLANK_POWERDOWN) {
	135	/* Clear the screen before shutting down */
	136	spi_write(spi, (const u8 *)&disoff, sizeof(u16));
	137	msleep(60);
	138	l4f00242t03_lcd_powerdown(spi);
	139	}
e7fb9c4a AP	140	}
e7fb9c4a AP	141
95558ad1 AP	142	priv->lcd_state = power;
95558ad1 AP	143
e7fb9c4a AP	144	return 0;
	145	}
	146
	147	static struct lcd_ops l4f_ops = {
	148	.set_power = l4f00242t03_lcd_power_set,
95558ad1	149	.get_power = l4f00242t03_lcd_power_get,
e7fb9c4a AP	150	};
e7fb9c4a AP	151
1b9e450d	152	static int l4f00242t03_probe(struct spi_device *spi)
e7fb9c4a AP	153	{
	154	struct l4f00242t03_priv *priv;
	155	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	156	int ret;
	157
	158	if (pdata == NULL) {
	159	dev_err(&spi->dev, "Uninitialized platform data.\n");
	160	return -EINVAL;
	161	}
	162
ba4a887a JH	163	priv = devm_kzalloc(&spi->dev, sizeof(struct l4f00242t03_priv),
ba4a887a JH	164	GFP_KERNEL);
e7fb9c4a AP	165
	166	if (priv == NULL) {
	167	dev_err(&spi->dev, "No memory for this device.\n");
beb0a43f	168	return -ENOMEM;
e7fb9c4a AP	169	}
e7fb9c4a AP	170
60066078	171	spi_set_drvdata(spi, priv);
e7fb9c4a AP	172	spi->bits_per_word = 9;
	173	spi_setup(spi);
	174
	175	priv->spi = spi;
	176
62a5c075 JH	177	ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
62a5c075 JH	178	GPIOF_OUT_INIT_HIGH, "lcd l4f00242t03 reset");
e7fb9c4a AP	179	if (ret) {
	180	dev_err(&spi->dev,
	181	"Unable to get the lcd l4f00242t03 reset gpio.\n");
ba4a887a	182	return ret;
e7fb9c4a AP	183	}
e7fb9c4a AP	184
62a5c075 JH	185	ret = devm_gpio_request_one(&spi->dev, pdata->data_enable_gpio,
62a5c075 JH	186	GPIOF_OUT_INIT_LOW, "lcd l4f00242t03 data enable");
e7fb9c4a AP	187	if (ret) {
	188	dev_err(&spi->dev,
	189	"Unable to get the lcd l4f00242t03 data en gpio.\n");
62a5c075	190	return ret;
e7fb9c4a AP	191	}
e7fb9c4a AP	192
610b71a6	193	priv->io_reg = devm_regulator_get(&spi->dev, "vdd");
0556dc34 MB	194	if (IS_ERR(priv->io_reg)) {
	195	dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
	196	__func__);
62a5c075	197	return PTR_ERR(priv->io_reg);
e7fb9c4a AP	198	}
e7fb9c4a AP	199
610b71a6	200	priv->core_reg = devm_regulator_get(&spi->dev, "vcore");
0556dc34 MB	201	if (IS_ERR(priv->core_reg)) {
	202	dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
	203	__func__);
610b71a6	204	return PTR_ERR(priv->core_reg);
e7fb9c4a AP	205	}
	206
	207	priv->ld = lcd_device_register("l4f00242t03",
	208	&spi->dev, priv, &l4f_ops);
610b71a6 AL	209	if (IS_ERR(priv->ld))
610b71a6 AL	210	return PTR_ERR(priv->ld);
e7fb9c4a AP	211
e7fb9c4a AP	212	/* Init the LCD */
e7fb9c4a	213	l4f00242t03_lcd_init(spi);
95558ad1 AP	214	priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
95558ad1 AP	215	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);
e7fb9c4a AP	216
	217	dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
	218
	219	return 0;
e7fb9c4a AP	220	}
e7fb9c4a AP	221
7e4b9d0b	222	static int l4f00242t03_remove(struct spi_device *spi)
e7fb9c4a	223	{
60066078	224	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
e7fb9c4a	225
95558ad1	226	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
e7fb9c4a	227	lcd_device_unregister(priv->ld);
60066078	228	spi_set_drvdata(spi, NULL);
95558ad1	229
e7fb9c4a AP	230	return 0;
	231	}
	232
95558ad1 AP	233	static void l4f00242t03_shutdown(struct spi_device *spi)
95558ad1 AP	234	{
60066078	235	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
95558ad1 AP	236
	237	if (priv)
	238	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
	239
	240	}
	241
e7fb9c4a AP	242	static struct spi_driver l4f00242t03_driver = {
	243	.driver = {
	244	.name = "l4f00242t03",
	245	.owner = THIS_MODULE,
	246	},
	247	.probe = l4f00242t03_probe,
d1723fa2	248	.remove = l4f00242t03_remove,
95558ad1	249	.shutdown = l4f00242t03_shutdown,
e7fb9c4a AP	250	};
e7fb9c4a AP	251
462dd838	252	module_spi_driver(l4f00242t03_driver);
e7fb9c4a AP	253
	254	MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
	255	MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
c3cf2e44	256	MODULE_LICENSE("GPL v2");