2 * l4f00242t03.c -- support for Epson L4F00242T03 LCD
4 * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
6 * Copyright (c) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
7 * Inspired by Marek Vasut work in l4f00242t03.c
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.
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>
19 #include <linux/slab.h>
20 #include <linux/regulator/consumer.h>
22 #include <linux/spi/spi.h>
23 #include <linux/spi/l4f00242t03.h>
25 struct l4f00242t03_priv {
26 struct spi_device *spi;
27 struct lcd_device *ld;
29 struct regulator *io_reg;
30 struct regulator *core_reg;
34 static void l4f00242t03_reset(unsigned int gpio)
36 pr_debug("l4f00242t03_reset.\n");
37 gpio_set_value(gpio, 1);
39 gpio_set_value(gpio, 0);
40 mdelay(10); /* tRES >= 100us */
41 gpio_set_value(gpio, 1);
45 #define param(x) ((x) | 0x100)
47 static void l4f00242t03_lcd_init(struct spi_device *spi)
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) };
53 dev_dbg(&spi->dev, "initializing LCD\n");
56 regulator_set_voltage(priv->io_reg, 1800000, 1800000);
57 regulator_enable(priv->io_reg);
61 regulator_set_voltage(priv->core_reg, 2800000, 2800000);
62 regulator_enable(priv->core_reg);
65 gpio_set_value(pdata->data_enable_gpio, 1);
67 spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16));
70 static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
72 struct l4f00242t03_priv *priv = lcd_get_data(ld);
73 struct spi_device *spi = priv->spi;
75 const u16 slpout = 0x11;
76 const u16 dison = 0x29;
78 const u16 slpin = 0x10;
79 const u16 disoff = 0x28;
85 dev_dbg(&spi->dev, "turning on LCD\n");
87 spi_write(spi, (const u8 *)&slpout, sizeof(u16));
89 spi_write(spi, (const u8 *)&dison, sizeof(u16));
96 dev_dbg(&spi->dev, "turning off LCD\n");
98 spi_write(spi, (const u8 *)&disoff, sizeof(u16));
100 spi_write(spi, (const u8 *)&slpin, sizeof(u16));
108 static struct lcd_ops l4f_ops = {
109 .set_power = l4f00242t03_lcd_power_set,
113 static int __devinit l4f00242t03_probe(struct spi_device *spi)
115 struct l4f00242t03_priv *priv;
116 struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
120 dev_err(&spi->dev, "Uninitialized platform data.\n");
124 priv = kzalloc(sizeof(struct l4f00242t03_priv), GFP_KERNEL);
127 dev_err(&spi->dev, "No memory for this device.\n");
131 dev_set_drvdata(&spi->dev, priv);
132 spi->bits_per_word = 9;
137 ret = gpio_request(pdata->reset_gpio, "lcd l4f00242t03 reset");
140 "Unable to get the lcd l4f00242t03 reset gpio.\n");
144 ret = gpio_direction_output(pdata->reset_gpio, 1);
148 ret = gpio_request(pdata->data_enable_gpio,
149 "lcd l4f00242t03 data enable");
152 "Unable to get the lcd l4f00242t03 data en gpio.\n");
156 ret = gpio_direction_output(pdata->data_enable_gpio, 0);
160 if (pdata->io_supply) {
161 priv->io_reg = regulator_get(NULL, pdata->io_supply);
163 if (IS_ERR(priv->io_reg)) {
164 pr_err("%s: Unable to get the IO regulator\n",
170 if (pdata->core_supply) {
171 priv->core_reg = regulator_get(NULL, pdata->core_supply);
173 if (IS_ERR(priv->core_reg)) {
174 pr_err("%s: Unable to get the core regulator\n",
180 priv->ld = lcd_device_register("l4f00242t03",
181 &spi->dev, priv, &l4f_ops);
182 if (IS_ERR(priv->ld)) {
183 ret = PTR_ERR(priv->ld);
188 l4f00242t03_reset(pdata->reset_gpio);
189 l4f00242t03_lcd_init(spi);
190 l4f00242t03_lcd_power_set(priv->ld, 1);
192 dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
198 regulator_put(priv->core_reg);
201 regulator_put(priv->io_reg);
203 gpio_free(pdata->data_enable_gpio);
205 gpio_free(pdata->reset_gpio);
212 static int __devexit l4f00242t03_remove(struct spi_device *spi)
214 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
215 struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data;
217 l4f00242t03_lcd_power_set(priv->ld, 0);
218 lcd_device_unregister(priv->ld);
220 gpio_free(pdata->data_enable_gpio);
221 gpio_free(pdata->reset_gpio);
224 regulator_put(priv->io_reg);
226 regulator_put(priv->core_reg);
233 static struct spi_driver l4f00242t03_driver = {
235 .name = "l4f00242t03",
236 .owner = THIS_MODULE,
238 .probe = l4f00242t03_probe,
239 .remove = __devexit_p(l4f00242t03_remove),
242 static __init int l4f00242t03_init(void)
244 return spi_register_driver(&l4f00242t03_driver);
247 static __exit void l4f00242t03_exit(void)
249 spi_unregister_driver(&l4f00242t03_driver);
252 module_init(l4f00242t03_init);
253 module_exit(l4f00242t03_exit);
255 MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
256 MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
257 MODULE_LICENSE("GPL v2");