[GitHub/mt8127/android_kernel_alcatel_ttab.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) };
	int ret;

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

	ret = regulator_set_voltage(priv->io_reg, 1800000, 1800000);
	if (ret) {
		dev_err(&spi->dev, "failed to set the IO regulator voltage.\n");
		return;
	}
	ret = regulator_enable(priv->io_reg);
	if (ret) {
		dev_err(&spi->dev, "failed to enable the IO regulator.\n");
		return;
	}

	ret = regulator_set_voltage(priv->core_reg, 2800000, 2800000);
	if (ret) {
		dev_err(&spi->dev, "failed to set the core regulator voltage.\n");
		regulator_disable(priv->io_reg);
		return;
	}
	ret = regulator_enable(priv->core_reg);
	if (ret) {
		dev_err(&spi->dev, "failed to enable the core regulator.\n");
		regulator_disable(priv->io_reg);
		return;
	}

	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	53	const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };
ef73e632	54	int ret;
e7fb9c4a AP	55
	56	dev_dbg(&spi->dev, "initializing LCD\n");
	57
ef73e632 JH	58	ret = regulator_set_voltage(priv->io_reg, 1800000, 1800000);
	59	if (ret) {
	60	dev_err(&spi->dev, "failed to set the IO regulator voltage.\n");
	61	return;
	62	}
	63	ret = regulator_enable(priv->io_reg);
	64	if (ret) {
	65	dev_err(&spi->dev, "failed to enable the IO regulator.\n");
	66	return;
	67	}
	68
	69	ret = regulator_set_voltage(priv->core_reg, 2800000, 2800000);
	70	if (ret) {
	71	dev_err(&spi->dev, "failed to set the core regulator voltage.\n");
	72	regulator_disable(priv->io_reg);
	73	return;
	74	}
	75	ret = regulator_enable(priv->core_reg);
	76	if (ret) {
	77	dev_err(&spi->dev, "failed to enable the core regulator.\n");
	78	regulator_disable(priv->io_reg);
	79	return;
	80	}
e7fb9c4a	81
aff5ce6c AP	82	l4f00242t03_reset(pdata->reset_gpio);
aff5ce6c AP	83
e7fb9c4a AP	84	gpio_set_value(pdata->data_enable_gpio, 1);
	85	msleep(60);
	86	spi_write(spi, (const u8 )cmd, ARRAY_SIZE(cmd) sizeof(u16));
	87	}
	88
95558ad1 AP	89	static void l4f00242t03_lcd_powerdown(struct spi_device *spi)
	90	{
	91	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
60066078	92	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
95558ad1 AP	93
	94	dev_dbg(&spi->dev, "Powering down LCD\n");
	95
	96	gpio_set_value(pdata->data_enable_gpio, 0);
	97
0556dc34 MB	98	regulator_disable(priv->io_reg);
0556dc34 MB	99	regulator_disable(priv->core_reg);
95558ad1 AP	100	}
	101
	102	static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
	103	{
	104	struct l4f00242t03_priv *priv = lcd_get_data(ld);
	105
	106	return priv->lcd_state;
	107	}
	108
e7fb9c4a AP	109	static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
	110	{
	111	struct l4f00242t03_priv *priv = lcd_get_data(ld);
	112	struct spi_device *spi = priv->spi;
	113
	114	const u16 slpout = 0x11;
	115	const u16 dison = 0x29;
	116
	117	const u16 slpin = 0x10;
	118	const u16 disoff = 0x28;
	119
4dbdf886	120	if (power <= FB_BLANK_NORMAL) {
95558ad1 AP	121	if (priv->lcd_state <= FB_BLANK_NORMAL) {
	122	/* Do nothing, the LCD is running */
	123	} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
	124	dev_dbg(&spi->dev, "Resuming LCD\n");
	125
	126	spi_write(spi, (const u8 *)&slpout, sizeof(u16));
	127	msleep(60);
	128	spi_write(spi, (const u8 *)&dison, sizeof(u16));
	129	} else {
	130	/* priv->lcd_state == FB_BLANK_POWERDOWN */
	131	l4f00242t03_lcd_init(spi);
	132	priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
	133	l4f00242t03_lcd_power_set(priv->ld, power);
	134	}
	135	} else if (power < FB_BLANK_POWERDOWN) {
	136	if (priv->lcd_state <= FB_BLANK_NORMAL) {
	137	/* Send the display in standby */
	138	dev_dbg(&spi->dev, "Standby the LCD\n");
	139
	140	spi_write(spi, (const u8 *)&disoff, sizeof(u16));
	141	msleep(60);
	142	spi_write(spi, (const u8 *)&slpin, sizeof(u16));
	143	} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
	144	/* Do nothing, the LCD is already in standby */
	145	} else {
	146	/* priv->lcd_state == FB_BLANK_POWERDOWN */
	147	l4f00242t03_lcd_init(spi);
	148	priv->lcd_state = FB_BLANK_UNBLANK;
	149	l4f00242t03_lcd_power_set(ld, power);
	150	}
e7fb9c4a	151	} else {
95558ad1	152	/* power == FB_BLANK_POWERDOWN */
26bbabc8 AP	153	if (priv->lcd_state != FB_BLANK_POWERDOWN) {
	154	/* Clear the screen before shutting down */
	155	spi_write(spi, (const u8 *)&disoff, sizeof(u16));
	156	msleep(60);
	157	l4f00242t03_lcd_powerdown(spi);
	158	}
e7fb9c4a AP	159	}
e7fb9c4a AP	160
95558ad1 AP	161	priv->lcd_state = power;
95558ad1 AP	162
e7fb9c4a AP	163	return 0;
	164	}
	165
	166	static struct lcd_ops l4f_ops = {
	167	.set_power = l4f00242t03_lcd_power_set,
95558ad1	168	.get_power = l4f00242t03_lcd_power_get,
e7fb9c4a AP	169	};
e7fb9c4a AP	170
1b9e450d	171	static int l4f00242t03_probe(struct spi_device *spi)
e7fb9c4a AP	172	{
	173	struct l4f00242t03_priv *priv;
	174	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	175	int ret;
	176
	177	if (pdata == NULL) {
	178	dev_err(&spi->dev, "Uninitialized platform data.\n");
	179	return -EINVAL;
	180	}
	181
ba4a887a JH	182	priv = devm_kzalloc(&spi->dev, sizeof(struct l4f00242t03_priv),
ba4a887a JH	183	GFP_KERNEL);
e7fb9c4a AP	184
	185	if (priv == NULL) {
	186	dev_err(&spi->dev, "No memory for this device.\n");
beb0a43f	187	return -ENOMEM;
e7fb9c4a AP	188	}
e7fb9c4a AP	189
60066078	190	spi_set_drvdata(spi, priv);
e7fb9c4a AP	191	spi->bits_per_word = 9;
	192	spi_setup(spi);
	193
	194	priv->spi = spi;
	195
62a5c075 JH	196	ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
62a5c075 JH	197	GPIOF_OUT_INIT_HIGH, "lcd l4f00242t03 reset");
e7fb9c4a AP	198	if (ret) {
	199	dev_err(&spi->dev,
	200	"Unable to get the lcd l4f00242t03 reset gpio.\n");
ba4a887a	201	return ret;
e7fb9c4a AP	202	}
e7fb9c4a AP	203
62a5c075 JH	204	ret = devm_gpio_request_one(&spi->dev, pdata->data_enable_gpio,
62a5c075 JH	205	GPIOF_OUT_INIT_LOW, "lcd l4f00242t03 data enable");
e7fb9c4a AP	206	if (ret) {
	207	dev_err(&spi->dev,
	208	"Unable to get the lcd l4f00242t03 data en gpio.\n");
62a5c075	209	return ret;
e7fb9c4a AP	210	}
e7fb9c4a AP	211
610b71a6	212	priv->io_reg = devm_regulator_get(&spi->dev, "vdd");
0556dc34 MB	213	if (IS_ERR(priv->io_reg)) {
	214	dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
	215	__func__);
62a5c075	216	return PTR_ERR(priv->io_reg);
e7fb9c4a AP	217	}
e7fb9c4a AP	218
610b71a6	219	priv->core_reg = devm_regulator_get(&spi->dev, "vcore");
0556dc34 MB	220	if (IS_ERR(priv->core_reg)) {
	221	dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
	222	__func__);
610b71a6	223	return PTR_ERR(priv->core_reg);
e7fb9c4a AP	224	}
	225
	226	priv->ld = lcd_device_register("l4f00242t03",
	227	&spi->dev, priv, &l4f_ops);
610b71a6 AL	228	if (IS_ERR(priv->ld))
610b71a6 AL	229	return PTR_ERR(priv->ld);
e7fb9c4a AP	230
e7fb9c4a AP	231	/* Init the LCD */
e7fb9c4a	232	l4f00242t03_lcd_init(spi);
95558ad1 AP	233	priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
95558ad1 AP	234	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);
e7fb9c4a AP	235
	236	dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
	237
	238	return 0;
e7fb9c4a AP	239	}
e7fb9c4a AP	240
7e4b9d0b	241	static int l4f00242t03_remove(struct spi_device *spi)
e7fb9c4a	242	{
60066078	243	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
e7fb9c4a	244
95558ad1	245	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
e7fb9c4a	246	lcd_device_unregister(priv->ld);
60066078	247	spi_set_drvdata(spi, NULL);
95558ad1	248
e7fb9c4a AP	249	return 0;
	250	}
	251
95558ad1 AP	252	static void l4f00242t03_shutdown(struct spi_device *spi)
95558ad1 AP	253	{
60066078	254	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
95558ad1 AP	255
	256	if (priv)
	257	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
	258
	259	}
	260
e7fb9c4a AP	261	static struct spi_driver l4f00242t03_driver = {
	262	.driver = {
	263	.name = "l4f00242t03",
	264	.owner = THIS_MODULE,
	265	},
	266	.probe = l4f00242t03_probe,
d1723fa2	267	.remove = l4f00242t03_remove,
95558ad1	268	.shutdown = l4f00242t03_shutdown,
e7fb9c4a AP	269	};
e7fb9c4a AP	270
462dd838	271	module_spi_driver(l4f00242t03_driver);
e7fb9c4a AP	272
	273	MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
	274	MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
c3cf2e44	275	MODULE_LICENSE("GPL v2");