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");
55 regulator_set_voltage(priv->io_reg, 1800000, 1800000);
56 regulator_enable(priv->io_reg);
58 regulator_set_voltage(priv->core_reg, 2800000, 2800000);
59 regulator_enable(priv->core_reg);
61 l4f00242t03_reset(pdata->reset_gpio);
63 gpio_set_value(pdata->data_enable_gpio, 1);
65 spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16));
68 static void l4f00242t03_lcd_powerdown(struct spi_device *spi)
70 struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
71 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
73 dev_dbg(&spi->dev, "Powering down LCD\n");
75 gpio_set_value(pdata->data_enable_gpio, 0);
77 regulator_disable(priv->io_reg);
78 regulator_disable(priv->core_reg);
81 static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
83 struct l4f00242t03_priv *priv = lcd_get_data(ld);
85 return priv->lcd_state;
88 static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
90 struct l4f00242t03_priv *priv = lcd_get_data(ld);
91 struct spi_device *spi = priv->spi;
93 const u16 slpout = 0x11;
94 const u16 dison = 0x29;
96 const u16 slpin = 0x10;
97 const u16 disoff = 0x28;
99 if (power <= FB_BLANK_NORMAL) {
100 if (priv->lcd_state <= FB_BLANK_NORMAL) {
101 /* Do nothing, the LCD is running */
102 } else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
103 dev_dbg(&spi->dev, "Resuming LCD\n");
105 spi_write(spi, (const u8 *)&slpout, sizeof(u16));
107 spi_write(spi, (const u8 *)&dison, sizeof(u16));
109 /* priv->lcd_state == FB_BLANK_POWERDOWN */
110 l4f00242t03_lcd_init(spi);
111 priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
112 l4f00242t03_lcd_power_set(priv->ld, power);
114 } else if (power < FB_BLANK_POWERDOWN) {
115 if (priv->lcd_state <= FB_BLANK_NORMAL) {
116 /* Send the display in standby */
117 dev_dbg(&spi->dev, "Standby the LCD\n");
119 spi_write(spi, (const u8 *)&disoff, sizeof(u16));
121 spi_write(spi, (const u8 *)&slpin, sizeof(u16));
122 } else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
123 /* Do nothing, the LCD is already in standby */
125 /* priv->lcd_state == FB_BLANK_POWERDOWN */
126 l4f00242t03_lcd_init(spi);
127 priv->lcd_state = FB_BLANK_UNBLANK;
128 l4f00242t03_lcd_power_set(ld, power);
131 /* power == FB_BLANK_POWERDOWN */
132 if (priv->lcd_state != FB_BLANK_POWERDOWN) {
133 /* Clear the screen before shutting down */
134 spi_write(spi, (const u8 *)&disoff, sizeof(u16));
136 l4f00242t03_lcd_powerdown(spi);
140 priv->lcd_state = power;
145 static struct lcd_ops l4f_ops = {
146 .set_power = l4f00242t03_lcd_power_set,
147 .get_power = l4f00242t03_lcd_power_get,
150 static int __devinit l4f00242t03_probe(struct spi_device *spi)
152 struct l4f00242t03_priv *priv;
153 struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
157 dev_err(&spi->dev, "Uninitialized platform data.\n");
161 priv = kzalloc(sizeof(struct l4f00242t03_priv), GFP_KERNEL);
164 dev_err(&spi->dev, "No memory for this device.\n");
168 dev_set_drvdata(&spi->dev, priv);
169 spi->bits_per_word = 9;
174 ret = gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH,
175 "lcd l4f00242t03 reset");
178 "Unable to get the lcd l4f00242t03 reset gpio.\n");
182 ret = gpio_request_one(pdata->data_enable_gpio, GPIOF_OUT_INIT_LOW,
183 "lcd l4f00242t03 data enable");
186 "Unable to get the lcd l4f00242t03 data en gpio.\n");
190 priv->io_reg = regulator_get(&spi->dev, "vdd");
191 if (IS_ERR(priv->io_reg)) {
192 dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
197 priv->core_reg = regulator_get(&spi->dev, "vcore");
198 if (IS_ERR(priv->core_reg)) {
199 dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
204 priv->ld = lcd_device_register("l4f00242t03",
205 &spi->dev, priv, &l4f_ops);
206 if (IS_ERR(priv->ld)) {
207 ret = PTR_ERR(priv->ld);
212 l4f00242t03_lcd_init(spi);
213 priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
214 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);
216 dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
221 regulator_put(priv->core_reg);
223 regulator_put(priv->io_reg);
225 gpio_free(pdata->data_enable_gpio);
227 gpio_free(pdata->reset_gpio);
234 static int __devexit l4f00242t03_remove(struct spi_device *spi)
236 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
237 struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data;
239 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
240 lcd_device_unregister(priv->ld);
242 dev_set_drvdata(&spi->dev, NULL);
244 gpio_free(pdata->data_enable_gpio);
245 gpio_free(pdata->reset_gpio);
247 regulator_put(priv->io_reg);
248 regulator_put(priv->core_reg);
255 static void l4f00242t03_shutdown(struct spi_device *spi)
257 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
260 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
264 static struct spi_driver l4f00242t03_driver = {
266 .name = "l4f00242t03",
267 .owner = THIS_MODULE,
269 .probe = l4f00242t03_probe,
270 .remove = __devexit_p(l4f00242t03_remove),
271 .shutdown = l4f00242t03_shutdown,
274 static __init int l4f00242t03_init(void)
276 return spi_register_driver(&l4f00242t03_driver);
279 static __exit void l4f00242t03_exit(void)
281 spi_unregister_driver(&l4f00242t03_driver);
284 module_init(l4f00242t03_init);
285 module_exit(l4f00242t03_exit);
287 MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
288 MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
289 MODULE_LICENSE("GPL v2");