[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.
 */

#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 = kzalloc(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 = gpio_request_one(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");
		goto err;
	}

	ret = gpio_request_one(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");
		goto err2;
	}

	priv->io_reg = regulator_get(&spi->dev, "vdd");
	if (IS_ERR(priv->io_reg)) {
		ret = PTR_ERR(priv->io_reg);
		dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
		       __func__);
		goto err3;
	}

	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 err4;
	}

	priv->ld = lcd_device_register("l4f00242t03",
					&spi->dev, priv, &l4f_ops);
	if (IS_ERR(priv->ld)) {
		ret = PTR_ERR(priv->ld);
		goto err5;
	}

	/* 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;

err5:
	regulator_put(priv->core_reg);
err4:
	regulator_put(priv->io_reg);
err3:
	gpio_free(pdata->data_enable_gpio);
err2:
	gpio_free(pdata->reset_gpio);
err:
	kfree(priv);

	return ret;
}

static int __devexit l4f00242t03_remove(struct spi_device *spi)
{
	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
	struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data;

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

	dev_set_drvdata(&spi->dev, NULL);

	gpio_free(pdata->data_enable_gpio);
	gpio_free(pdata->reset_gpio);

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

	kfree(priv);

	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,
};

static __init int l4f00242t03_init(void)
{
	return spi_register_driver(&l4f00242t03_driver);
}

static __exit void l4f00242t03_exit(void)
{
	spi_unregister_driver(&l4f00242t03_driver);
}

module_init(l4f00242t03_init);
module_exit(l4f00242t03_exit);

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
	14	#include <linux/device.h>
	15	#include <linux/kernel.h>
	16	#include <linux/delay.h>
355b200b	17	#include <linux/module.h>
e7fb9c4a AP	18	#include <linux/gpio.h>
e7fb9c4a AP	19	#include <linux/lcd.h>
5a0e3ad6	20	#include <linux/slab.h>
e7fb9c4a AP	21	#include <linux/regulator/consumer.h>
	22
	23	#include <linux/spi/spi.h>
	24	#include <linux/spi/l4f00242t03.h>
	25
	26	struct l4f00242t03_priv {
	27	struct spi_device *spi;
	28	struct lcd_device *ld;
95558ad1	29	int lcd_state;
e7fb9c4a AP	30	struct regulator *io_reg;
	31	struct regulator *core_reg;
	32	};
	33
	34
	35	static void l4f00242t03_reset(unsigned int gpio)
	36	{
	37	pr_debug("l4f00242t03_reset.\n");
	38	gpio_set_value(gpio, 1);
	39	mdelay(100);
	40	gpio_set_value(gpio, 0);
	41	mdelay(10); /* tRES >= 100us */
	42	gpio_set_value(gpio, 1);
	43	mdelay(20);
	44	}
	45
	46	#define param(x) ((x) \| 0x100)
	47
	48	static void l4f00242t03_lcd_init(struct spi_device *spi)
	49	{
	50	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	51	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
	52	const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };
	53
	54	dev_dbg(&spi->dev, "initializing LCD\n");
	55
0556dc34 MB	56	regulator_set_voltage(priv->io_reg, 1800000, 1800000);
0556dc34 MB	57	regulator_enable(priv->io_reg);
e7fb9c4a	58
0556dc34 MB	59	regulator_set_voltage(priv->core_reg, 2800000, 2800000);
0556dc34 MB	60	regulator_enable(priv->core_reg);
e7fb9c4a	61
aff5ce6c AP	62	l4f00242t03_reset(pdata->reset_gpio);
aff5ce6c AP	63
e7fb9c4a AP	64	gpio_set_value(pdata->data_enable_gpio, 1);
	65	msleep(60);
	66	spi_write(spi, (const u8 )cmd, ARRAY_SIZE(cmd) sizeof(u16));
	67	}
	68
95558ad1 AP	69	static void l4f00242t03_lcd_powerdown(struct spi_device *spi)
	70	{
	71	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	72	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
	73
	74	dev_dbg(&spi->dev, "Powering down LCD\n");
	75
	76	gpio_set_value(pdata->data_enable_gpio, 0);
	77
0556dc34 MB	78	regulator_disable(priv->io_reg);
0556dc34 MB	79	regulator_disable(priv->core_reg);
95558ad1 AP	80	}
	81
	82	static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
	83	{
	84	struct l4f00242t03_priv *priv = lcd_get_data(ld);
	85
	86	return priv->lcd_state;
	87	}
	88
e7fb9c4a AP	89	static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
	90	{
	91	struct l4f00242t03_priv *priv = lcd_get_data(ld);
	92	struct spi_device *spi = priv->spi;
	93
	94	const u16 slpout = 0x11;
	95	const u16 dison = 0x29;
	96
	97	const u16 slpin = 0x10;
	98	const u16 disoff = 0x28;
	99
4dbdf886	100	if (power <= FB_BLANK_NORMAL) {
95558ad1 AP	101	if (priv->lcd_state <= FB_BLANK_NORMAL) {
	102	/* Do nothing, the LCD is running */
	103	} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
	104	dev_dbg(&spi->dev, "Resuming LCD\n");
	105
	106	spi_write(spi, (const u8 *)&slpout, sizeof(u16));
	107	msleep(60);
	108	spi_write(spi, (const u8 *)&dison, sizeof(u16));
	109	} else {
	110	/* priv->lcd_state == FB_BLANK_POWERDOWN */
	111	l4f00242t03_lcd_init(spi);
	112	priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
	113	l4f00242t03_lcd_power_set(priv->ld, power);
	114	}
	115	} else if (power < FB_BLANK_POWERDOWN) {
	116	if (priv->lcd_state <= FB_BLANK_NORMAL) {
	117	/* Send the display in standby */
	118	dev_dbg(&spi->dev, "Standby the LCD\n");
	119
	120	spi_write(spi, (const u8 *)&disoff, sizeof(u16));
	121	msleep(60);
	122	spi_write(spi, (const u8 *)&slpin, sizeof(u16));
	123	} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
	124	/* Do nothing, the LCD is already in standby */
	125	} else {
	126	/* priv->lcd_state == FB_BLANK_POWERDOWN */
	127	l4f00242t03_lcd_init(spi);
	128	priv->lcd_state = FB_BLANK_UNBLANK;
	129	l4f00242t03_lcd_power_set(ld, power);
	130	}
e7fb9c4a	131	} else {
95558ad1	132	/* power == FB_BLANK_POWERDOWN */
26bbabc8 AP	133	if (priv->lcd_state != FB_BLANK_POWERDOWN) {
	134	/* Clear the screen before shutting down */
	135	spi_write(spi, (const u8 *)&disoff, sizeof(u16));
	136	msleep(60);
	137	l4f00242t03_lcd_powerdown(spi);
	138	}
e7fb9c4a AP	139	}
e7fb9c4a AP	140
95558ad1 AP	141	priv->lcd_state = power;
95558ad1 AP	142
e7fb9c4a AP	143	return 0;
	144	}
	145
	146	static struct lcd_ops l4f_ops = {
	147	.set_power = l4f00242t03_lcd_power_set,
95558ad1	148	.get_power = l4f00242t03_lcd_power_get,
e7fb9c4a AP	149	};
	150
	151	static int __devinit l4f00242t03_probe(struct spi_device *spi)
	152	{
	153	struct l4f00242t03_priv *priv;
	154	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	155	int ret;
	156
	157	if (pdata == NULL) {
	158	dev_err(&spi->dev, "Uninitialized platform data.\n");
	159	return -EINVAL;
	160	}
	161
	162	priv = kzalloc(sizeof(struct l4f00242t03_priv), GFP_KERNEL);
	163
	164	if (priv == NULL) {
	165	dev_err(&spi->dev, "No memory for this device.\n");
beb0a43f	166	return -ENOMEM;
e7fb9c4a AP	167	}
	168
	169	dev_set_drvdata(&spi->dev, priv);
	170	spi->bits_per_word = 9;
	171	spi_setup(spi);
	172
	173	priv->spi = spi;
	174
4f5a66b0 FE	175	ret = gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH,
4f5a66b0 FE	176	"lcd l4f00242t03 reset");
e7fb9c4a AP	177	if (ret) {
	178	dev_err(&spi->dev,
	179	"Unable to get the lcd l4f00242t03 reset gpio.\n");
beb0a43f	180	goto err;
e7fb9c4a AP	181	}
e7fb9c4a AP	182
4f5a66b0 FE	183	ret = gpio_request_one(pdata->data_enable_gpio, GPIOF_OUT_INIT_LOW,
4f5a66b0 FE	184	"lcd l4f00242t03 data enable");
e7fb9c4a AP	185	if (ret) {
	186	dev_err(&spi->dev,
	187	"Unable to get the lcd l4f00242t03 data en gpio.\n");
beb0a43f	188	goto err2;
e7fb9c4a AP	189	}
e7fb9c4a AP	190
0556dc34 MB	191	priv->io_reg = regulator_get(&spi->dev, "vdd");
0556dc34 MB	192	if (IS_ERR(priv->io_reg)) {
d59d9eba	193	ret = PTR_ERR(priv->io_reg);
0556dc34 MB	194	dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
	195	__func__);
	196	goto err3;
e7fb9c4a AP	197	}
e7fb9c4a AP	198
0556dc34 MB	199	priv->core_reg = regulator_get(&spi->dev, "vcore");
0556dc34 MB	200	if (IS_ERR(priv->core_reg)) {
d59d9eba	201	ret = PTR_ERR(priv->core_reg);
0556dc34 MB	202	dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
	203	__func__);
	204	goto err4;
e7fb9c4a AP	205	}
	206
	207	priv->ld = lcd_device_register("l4f00242t03",
	208	&spi->dev, priv, &l4f_ops);
	209	if (IS_ERR(priv->ld)) {
	210	ret = PTR_ERR(priv->ld);
	211	goto err5;
	212	}
	213
	214	/* Init the LCD */
e7fb9c4a	215	l4f00242t03_lcd_init(spi);
95558ad1 AP	216	priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
95558ad1 AP	217	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);
e7fb9c4a AP	218
	219	dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
	220
	221	return 0;
	222
	223	err5:
0556dc34	224	regulator_put(priv->core_reg);
e7fb9c4a	225	err4:
0556dc34	226	regulator_put(priv->io_reg);
e7fb9c4a AP	227	err3:
	228	gpio_free(pdata->data_enable_gpio);
	229	err2:
	230	gpio_free(pdata->reset_gpio);
	231	err:
	232	kfree(priv);
	233
	234	return ret;
	235	}
	236
	237	static int __devexit l4f00242t03_remove(struct spi_device *spi)
	238	{
	239	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
	240	struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data;
	241
95558ad1	242	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
e7fb9c4a AP	243	lcd_device_unregister(priv->ld);
e7fb9c4a AP	244
95558ad1 AP	245	dev_set_drvdata(&spi->dev, NULL);
95558ad1 AP	246
e7fb9c4a AP	247	gpio_free(pdata->data_enable_gpio);
	248	gpio_free(pdata->reset_gpio);
	249
0556dc34 MB	250	regulator_put(priv->io_reg);
0556dc34 MB	251	regulator_put(priv->core_reg);
e7fb9c4a AP	252
	253	kfree(priv);
	254
	255	return 0;
	256	}
	257
95558ad1 AP	258	static void l4f00242t03_shutdown(struct spi_device *spi)
	259	{
	260	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
	261
	262	if (priv)
	263	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
	264
	265	}
	266
e7fb9c4a AP	267	static struct spi_driver l4f00242t03_driver = {
	268	.driver = {
	269	.name = "l4f00242t03",
	270	.owner = THIS_MODULE,
	271	},
	272	.probe = l4f00242t03_probe,
	273	.remove = __devexit_p(l4f00242t03_remove),
95558ad1	274	.shutdown = l4f00242t03_shutdown,
e7fb9c4a AP	275	};
	276
	277	static __init int l4f00242t03_init(void)
	278	{
	279	return spi_register_driver(&l4f00242t03_driver);
	280	}
	281
	282	static __exit void l4f00242t03_exit(void)
	283	{
	284	spi_unregister_driver(&l4f00242t03_driver);
	285	}
	286
	287	module_init(l4f00242t03_init);
	288	module_exit(l4f00242t03_exit);
	289
	290	MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
	291	MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
c3cf2e44	292	MODULE_LICENSE("GPL v2");