[linux-2.6-block.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/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_on:1;
	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");

	if (priv->io_reg) {
		regulator_set_voltage(priv->io_reg, 1800000, 1800000);
		regulator_enable(priv->io_reg);
	}

	if (priv->core_reg) {
		regulator_set_voltage(priv->core_reg, 2800000, 2800000);
		regulator_enable(priv->core_reg);
	}

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

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) {
		if (priv->lcd_on)
			return 0;

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

		spi_write(spi, (const u8 *)&slpout, sizeof(u16));
		msleep(60);
		spi_write(spi, (const u8 *)&dison, sizeof(u16));

		priv->lcd_on = 1;
	} else {
		if (!priv->lcd_on)
			return 0;

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

		spi_write(spi, (const u8 *)&disoff, sizeof(u16));
		msleep(60);
		spi_write(spi, (const u8 *)&slpin, sizeof(u16));

		priv->lcd_on = 0;
	}

	return 0;
}

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

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");
		ret = -ENOMEM;
		goto err;
	}

	dev_set_drvdata(&spi->dev, priv);
	spi->bits_per_word = 9;
	spi_setup(spi);

	priv->spi = spi;

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

	ret = gpio_direction_output(pdata->reset_gpio, 1);
	if (ret)
		goto err2;

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

	ret = gpio_direction_output(pdata->data_enable_gpio, 0);
	if (ret)
		goto err3;

	if (pdata->io_supply) {
		priv->io_reg = regulator_get(NULL, pdata->io_supply);

		if (IS_ERR(priv->io_reg)) {
			pr_err("%s: Unable to get the IO regulator\n",
								__func__);
			goto err3;
		}
	}

	if (pdata->core_supply) {
		priv->core_reg = regulator_get(NULL, pdata->core_supply);

		if (IS_ERR(priv->core_reg)) {
			pr_err("%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_reset(pdata->reset_gpio);
	l4f00242t03_lcd_init(spi);
	l4f00242t03_lcd_power_set(priv->ld, 1);

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

	return 0;

err5:
	if (priv->core_reg)
		regulator_put(priv->core_reg);
err4:
	if (priv->io_reg)
		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, 0);
	lcd_device_unregister(priv->ld);

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

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

	kfree(priv);

	return 0;
}

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

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>
	17	#include <linux/gpio.h>
	18	#include <linux/lcd.h>
5a0e3ad6	19	#include <linux/slab.h>
e7fb9c4a AP	20	#include <linux/regulator/consumer.h>
	21
	22	#include <linux/spi/spi.h>
	23	#include <linux/spi/l4f00242t03.h>
	24
	25	struct l4f00242t03_priv {
	26	struct spi_device *spi;
	27	struct lcd_device *ld;
	28	int lcd_on:1;
	29	struct regulator *io_reg;
	30	struct regulator *core_reg;
	31	};
	32
	33
	34	static void l4f00242t03_reset(unsigned int gpio)
	35	{
	36	pr_debug("l4f00242t03_reset.\n");
	37	gpio_set_value(gpio, 1);
	38	mdelay(100);
	39	gpio_set_value(gpio, 0);
	40	mdelay(10); /* tRES >= 100us */
	41	gpio_set_value(gpio, 1);
	42	mdelay(20);
	43	}
	44
	45	#define param(x) ((x) \| 0x100)
	46
	47	static void l4f00242t03_lcd_init(struct spi_device *spi)
	48	{
	49	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
	50	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
	51	const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };
	52
	53	dev_dbg(&spi->dev, "initializing LCD\n");
	54
	55	if (priv->io_reg) {
	56	regulator_set_voltage(priv->io_reg, 1800000, 1800000);
	57	regulator_enable(priv->io_reg);
	58	}
	59
	60	if (priv->core_reg) {
	61	regulator_set_voltage(priv->core_reg, 2800000, 2800000);
	62	regulator_enable(priv->core_reg);
	63	}
	64
	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
	70	static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
	71	{
	72	struct l4f00242t03_priv *priv = lcd_get_data(ld);
	73	struct spi_device *spi = priv->spi;
	74
	75	const u16 slpout = 0x11;
	76	const u16 dison = 0x29;
	77
	78	const u16 slpin = 0x10;
	79	const u16 disoff = 0x28;
	80
	81	if (power) {
	82	if (priv->lcd_on)
	83	return 0;
84
85	dev_dbg(&spi->dev, "turning on LCD\n");
86
87	spi_write(spi, (const u8 *)&slpout, sizeof(u16));
88	msleep(60);
89	spi_write(spi, (const u8 *)&dison, sizeof(u16));
90
91	priv->lcd_on = 1;
92	} else {
93	if (!priv->lcd_on)
94	return 0;
95
96	dev_dbg(&spi->dev, "turning off LCD\n");
97
98	spi_write(spi, (const u8 *)&disoff, sizeof(u16));
99	msleep(60);
100	spi_write(spi, (const u8 *)&slpin, sizeof(u16));
101
102	priv->lcd_on = 0;
103	}
104
105	return 0;
106	}
107
108	static struct lcd_ops l4f_ops = {
109	.set_power = l4f00242t03_lcd_power_set,
110	.get_power = NULL,
111	};
112
113	static int __devinit l4f00242t03_probe(struct spi_device *spi)
114	{
115	struct l4f00242t03_priv *priv;
116	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
117	int ret;
118
119	if (pdata == NULL) {
120	dev_err(&spi->dev, "Uninitialized platform data.\n");
121	return -EINVAL;
122	}
123
124	priv = kzalloc(sizeof(struct l4f00242t03_priv), GFP_KERNEL);
125
126	if (priv == NULL) {
127	dev_err(&spi->dev, "No memory for this device.\n");
128	ret = -ENOMEM;
129	goto err;
130	}
131
132	dev_set_drvdata(&spi->dev, priv);
133	spi->bits_per_word = 9;
134	spi_setup(spi);
135
136	priv->spi = spi;
137
138	ret = gpio_request(pdata->reset_gpio, "lcd l4f00242t03 reset");
139	if (ret) {
140	dev_err(&spi->dev,
141	"Unable to get the lcd l4f00242t03 reset gpio.\n");
142	return ret;
143	}
144
145	ret = gpio_direction_output(pdata->reset_gpio, 1);
146	if (ret)
147	goto err2;
148
149	ret = gpio_request(pdata->data_enable_gpio,
150	"lcd l4f00242t03 data enable");
151	if (ret) {
152	dev_err(&spi->dev,
153	"Unable to get the lcd l4f00242t03 data en gpio.\n");
154	return ret;
155	}
156
157	ret = gpio_direction_output(pdata->data_enable_gpio, 0);
158	if (ret)
159	goto err3;
160
161	if (pdata->io_supply) {
162	priv->io_reg = regulator_get(NULL, pdata->io_supply);
163
164	if (IS_ERR(priv->io_reg)) {
165	pr_err("%s: Unable to get the IO regulator\n",
166	__func__);
167	goto err3;
168	}
169	}
170
171	if (pdata->core_supply) {
172	priv->core_reg = regulator_get(NULL, pdata->core_supply);
173
174	if (IS_ERR(priv->core_reg)) {
175	pr_err("%s: Unable to get the core regulator\n",
176	__func__);
177	goto err4;
178	}
179	}
180
181	priv->ld = lcd_device_register("l4f00242t03",
182	&spi->dev, priv, &l4f_ops);
183	if (IS_ERR(priv->ld)) {
184	ret = PTR_ERR(priv->ld);
185	goto err5;
186	}
187
188	/* Init the LCD */
189	l4f00242t03_reset(pdata->reset_gpio);
190	l4f00242t03_lcd_init(spi);
191	l4f00242t03_lcd_power_set(priv->ld, 1);
192
193	dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
194
195	return 0;
196
197	err5:
198	if (priv->core_reg)
199	regulator_put(priv->core_reg);
200	err4:
201	if (priv->io_reg)
202	regulator_put(priv->io_reg);
203	err3:
204	gpio_free(pdata->data_enable_gpio);
205	err2:
206	gpio_free(pdata->reset_gpio);
207	err:
208	kfree(priv);
209
210	return ret;
211	}
212
213	static int __devexit l4f00242t03_remove(struct spi_device *spi)
214	{
215	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
216	struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data;
217
218	l4f00242t03_lcd_power_set(priv->ld, 0);
219	lcd_device_unregister(priv->ld);
220
221	gpio_free(pdata->data_enable_gpio);
222	gpio_free(pdata->reset_gpio);
223
224	if (priv->io_reg)
225	regulator_put(priv->core_reg);
226	if (priv->core_reg)
227	regulator_put(priv->io_reg);
228
229	kfree(priv);
230
231	return 0;
232	}
233
234	static struct spi_driver l4f00242t03_driver = {
235	.driver = {
236	.name = "l4f00242t03",
237	.owner = THIS_MODULE,
238	},
239	.probe = l4f00242t03_probe,
240	.remove = __devexit_p(l4f00242t03_remove),
241	};
242
243	static __init int l4f00242t03_init(void)
244	{
245	return spi_register_driver(&l4f00242t03_driver);
246	}
247
248	static __exit void l4f00242t03_exit(void)
249	{
250	spi_unregister_driver(&l4f00242t03_driver);
251	}
252
253	module_init(l4f00242t03_init);
254	module_exit(l4f00242t03_exit);
255
256	MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
257	MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
c3cf2e44	258	MODULE_LICENSE("GPL v2");