[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 = dev_get_drvdata(&spi->dev);
	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 = dev_get_drvdata(&spi->dev);

	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 __devinit 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;
	}

	dev_set_drvdata(&spi->dev, 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 = 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 = regulator_get(&spi->dev, "vcore");
	if (IS_ERR(priv->core_reg)) {
		ret = PTR_ERR(priv->core_reg);
		dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
		       __func__);
		goto err1;
	}

	priv->ld = lcd_device_register("l4f00242t03",
					&spi->dev, priv, &l4f_ops);
	if (IS_ERR(priv->ld)) {
		ret = PTR_ERR(priv->ld);
		goto err2;
	}

	/* 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;

err2:
	regulator_put(priv->core_reg);
err1:
	regulator_put(priv->io_reg);

	return ret;
}

static int __devexit l4f00242t03_remove(struct spi_device *spi)
{
	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);

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

	dev_set_drvdata(&spi->dev, NULL);

	regulator_put(priv->io_reg);
	regulator_put(priv->core_reg);

	return 0;
}

static void l4f00242t03_shutdown(struct spi_device *spi)
{
	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);

	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		= __devexit_p(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>
	7	* Inspired by Marek Vasut work in l4f00242t03.c
	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
	36
	37	static void l4f00242t03_reset(unsigned int gpio)
	38	{
	39	pr_debug("l4f00242t03_reset.\n");
	40	gpio_set_value(gpio, 1);
	41	mdelay(100);
	42	gpio_set_value(gpio, 0);
	43	mdelay(10); /* tRES >= 100us */
	44	gpio_set_value(gpio, 1);
	45	mdelay(20);
	46	}
	47
	48	#define param(x) ((x) \| 0x100)
	49
	50	static void l4f00242t03_lcd_init(struct spi_device *spi)
	51	{
	52	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	53	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
	54	const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };
	55
	56	dev_dbg(&spi->dev, "initializing LCD\n");
	57
0556dc34 MB	58	regulator_set_voltage(priv->io_reg, 1800000, 1800000);
0556dc34 MB	59	regulator_enable(priv->io_reg);
e7fb9c4a	60
0556dc34 MB	61	regulator_set_voltage(priv->core_reg, 2800000, 2800000);
0556dc34 MB	62	regulator_enable(priv->core_reg);
e7fb9c4a	63
aff5ce6c AP	64	l4f00242t03_reset(pdata->reset_gpio);
aff5ce6c AP	65
e7fb9c4a AP	66	gpio_set_value(pdata->data_enable_gpio, 1);
	67	msleep(60);
	68	spi_write(spi, (const u8 )cmd, ARRAY_SIZE(cmd) sizeof(u16));
	69	}
	70
95558ad1 AP	71	static void l4f00242t03_lcd_powerdown(struct spi_device *spi)
	72	{
	73	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	74	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
	75
	76	dev_dbg(&spi->dev, "Powering down LCD\n");
	77
	78	gpio_set_value(pdata->data_enable_gpio, 0);
	79
0556dc34 MB	80	regulator_disable(priv->io_reg);
0556dc34 MB	81	regulator_disable(priv->core_reg);
95558ad1 AP	82	}
	83
	84	static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
	85	{
	86	struct l4f00242t03_priv *priv = lcd_get_data(ld);
	87
	88	return priv->lcd_state;
	89	}
	90
e7fb9c4a AP	91	static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
	92	{
	93	struct l4f00242t03_priv *priv = lcd_get_data(ld);
	94	struct spi_device *spi = priv->spi;
	95
	96	const u16 slpout = 0x11;
	97	const u16 dison = 0x29;
	98
	99	const u16 slpin = 0x10;
	100	const u16 disoff = 0x28;
	101
4dbdf886	102	if (power <= FB_BLANK_NORMAL) {
95558ad1 AP	103	if (priv->lcd_state <= FB_BLANK_NORMAL) {
	104	/* Do nothing, the LCD is running */
	105	} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
	106	dev_dbg(&spi->dev, "Resuming LCD\n");
	107
	108	spi_write(spi, (const u8 *)&slpout, sizeof(u16));
	109	msleep(60);
	110	spi_write(spi, (const u8 *)&dison, sizeof(u16));
	111	} else {
	112	/* priv->lcd_state == FB_BLANK_POWERDOWN */
	113	l4f00242t03_lcd_init(spi);
	114	priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
	115	l4f00242t03_lcd_power_set(priv->ld, power);
	116	}
	117	} else if (power < FB_BLANK_POWERDOWN) {
	118	if (priv->lcd_state <= FB_BLANK_NORMAL) {
	119	/* Send the display in standby */
	120	dev_dbg(&spi->dev, "Standby the LCD\n");
	121
	122	spi_write(spi, (const u8 *)&disoff, sizeof(u16));
	123	msleep(60);
	124	spi_write(spi, (const u8 *)&slpin, sizeof(u16));
	125	} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
	126	/* Do nothing, the LCD is already in standby */
	127	} else {
	128	/* priv->lcd_state == FB_BLANK_POWERDOWN */
	129	l4f00242t03_lcd_init(spi);
	130	priv->lcd_state = FB_BLANK_UNBLANK;
	131	l4f00242t03_lcd_power_set(ld, power);
	132	}
e7fb9c4a	133	} else {
95558ad1	134	/* power == FB_BLANK_POWERDOWN */
26bbabc8 AP	135	if (priv->lcd_state != FB_BLANK_POWERDOWN) {
	136	/* Clear the screen before shutting down */
	137	spi_write(spi, (const u8 *)&disoff, sizeof(u16));
	138	msleep(60);
	139	l4f00242t03_lcd_powerdown(spi);
	140	}
e7fb9c4a AP	141	}
e7fb9c4a AP	142
95558ad1 AP	143	priv->lcd_state = power;
95558ad1 AP	144
e7fb9c4a AP	145	return 0;
	146	}
	147
	148	static struct lcd_ops l4f_ops = {
	149	.set_power = l4f00242t03_lcd_power_set,
95558ad1	150	.get_power = l4f00242t03_lcd_power_get,
e7fb9c4a AP	151	};
	152
	153	static int __devinit l4f00242t03_probe(struct spi_device *spi)
	154	{
	155	struct l4f00242t03_priv *priv;
	156	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	157	int ret;
	158
	159	if (pdata == NULL) {
	160	dev_err(&spi->dev, "Uninitialized platform data.\n");
	161	return -EINVAL;
	162	}
	163
ba4a887a JH	164	priv = devm_kzalloc(&spi->dev, sizeof(struct l4f00242t03_priv),
ba4a887a JH	165	GFP_KERNEL);
e7fb9c4a AP	166
	167	if (priv == NULL) {
	168	dev_err(&spi->dev, "No memory for this device.\n");
beb0a43f	169	return -ENOMEM;
e7fb9c4a AP	170	}
	171
	172	dev_set_drvdata(&spi->dev, priv);
	173	spi->bits_per_word = 9;
	174	spi_setup(spi);
	175
	176	priv->spi = spi;
	177
62a5c075 JH	178	ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
62a5c075 JH	179	GPIOF_OUT_INIT_HIGH, "lcd l4f00242t03 reset");
e7fb9c4a AP	180	if (ret) {
	181	dev_err(&spi->dev,
	182	"Unable to get the lcd l4f00242t03 reset gpio.\n");
ba4a887a	183	return ret;
e7fb9c4a AP	184	}
e7fb9c4a AP	185
62a5c075 JH	186	ret = devm_gpio_request_one(&spi->dev, pdata->data_enable_gpio,
62a5c075 JH	187	GPIOF_OUT_INIT_LOW, "lcd l4f00242t03 data enable");
e7fb9c4a AP	188	if (ret) {
	189	dev_err(&spi->dev,
	190	"Unable to get the lcd l4f00242t03 data en gpio.\n");
62a5c075	191	return ret;
e7fb9c4a AP	192	}
e7fb9c4a AP	193
0556dc34 MB	194	priv->io_reg = regulator_get(&spi->dev, "vdd");
	195	if (IS_ERR(priv->io_reg)) {
	196	dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
	197	__func__);
62a5c075	198	return PTR_ERR(priv->io_reg);
e7fb9c4a AP	199	}
e7fb9c4a AP	200
0556dc34 MB	201	priv->core_reg = regulator_get(&spi->dev, "vcore");
0556dc34 MB	202	if (IS_ERR(priv->core_reg)) {
d59d9eba	203	ret = PTR_ERR(priv->core_reg);
0556dc34 MB	204	dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
0556dc34 MB	205	__func__);
62a5c075	206	goto err1;
e7fb9c4a AP	207	}
	208
	209	priv->ld = lcd_device_register("l4f00242t03",
	210	&spi->dev, priv, &l4f_ops);
	211	if (IS_ERR(priv->ld)) {
	212	ret = PTR_ERR(priv->ld);
62a5c075	213	goto err2;
e7fb9c4a AP	214	}
	215
	216	/* Init the LCD */
e7fb9c4a	217	l4f00242t03_lcd_init(spi);
95558ad1 AP	218	priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
95558ad1 AP	219	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);
e7fb9c4a AP	220
	221	dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
	222
	223	return 0;
	224
62a5c075	225	err2:
ba4a887a	226	regulator_put(priv->core_reg);
62a5c075	227	err1:
ba4a887a	228	regulator_put(priv->io_reg);
e7fb9c4a AP	229
	230	return ret;
	231	}
	232
	233	static int __devexit l4f00242t03_remove(struct spi_device *spi)
	234	{
	235	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
e7fb9c4a	236
95558ad1	237	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
e7fb9c4a AP	238	lcd_device_unregister(priv->ld);
e7fb9c4a AP	239
95558ad1 AP	240	dev_set_drvdata(&spi->dev, NULL);
95558ad1 AP	241
0556dc34 MB	242	regulator_put(priv->io_reg);
0556dc34 MB	243	regulator_put(priv->core_reg);
e7fb9c4a	244
e7fb9c4a AP	245	return 0;
	246	}
	247
95558ad1 AP	248	static void l4f00242t03_shutdown(struct spi_device *spi)
	249	{
	250	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
	251
	252	if (priv)
	253	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
	254
	255	}
	256
e7fb9c4a AP	257	static struct spi_driver l4f00242t03_driver = {
	258	.driver = {
	259	.name = "l4f00242t03",
	260	.owner = THIS_MODULE,
	261	},
	262	.probe = l4f00242t03_probe,
	263	.remove = __devexit_p(l4f00242t03_remove),
95558ad1	264	.shutdown = l4f00242t03_shutdown,
e7fb9c4a AP	265	};
e7fb9c4a AP	266
462dd838	267	module_spi_driver(l4f00242t03_driver);
e7fb9c4a AP	268
	269	MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
	270	MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
c3cf2e44	271	MODULE_LICENSE("GPL v2");