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 void l4f00242t03_lcd_powerdown(struct spi_device *spi)
72 struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
73 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
75 dev_dbg(&spi->dev, "Powering down LCD\n");
77 gpio_set_value(pdata->data_enable_gpio, 0);
80 regulator_disable(priv->io_reg);
83 regulator_disable(priv->core_reg);
86 static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
88 struct l4f00242t03_priv *priv = lcd_get_data(ld);
90 return priv->lcd_state;
93 static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
95 struct l4f00242t03_priv *priv = lcd_get_data(ld);
96 struct spi_device *spi = priv->spi;
98 const u16 slpout = 0x11;
99 const u16 dison = 0x29;
101 const u16 slpin = 0x10;
102 const u16 disoff = 0x28;
104 if (power <= FB_BLANK_NORMAL) {
105 if (priv->lcd_state <= FB_BLANK_NORMAL) {
106 /* Do nothing, the LCD is running */
107 } else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
108 dev_dbg(&spi->dev, "Resuming LCD\n");
110 spi_write(spi, (const u8 *)&slpout, sizeof(u16));
112 spi_write(spi, (const u8 *)&dison, sizeof(u16));
114 /* priv->lcd_state == FB_BLANK_POWERDOWN */
115 l4f00242t03_lcd_init(spi);
116 priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
117 l4f00242t03_lcd_power_set(priv->ld, power);
119 } else if (power < FB_BLANK_POWERDOWN) {
120 if (priv->lcd_state <= FB_BLANK_NORMAL) {
121 /* Send the display in standby */
122 dev_dbg(&spi->dev, "Standby the LCD\n");
124 spi_write(spi, (const u8 *)&disoff, sizeof(u16));
126 spi_write(spi, (const u8 *)&slpin, sizeof(u16));
127 } else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
128 /* Do nothing, the LCD is already in standby */
130 /* priv->lcd_state == FB_BLANK_POWERDOWN */
131 l4f00242t03_lcd_init(spi);
132 priv->lcd_state = FB_BLANK_UNBLANK;
133 l4f00242t03_lcd_power_set(ld, power);
136 /* power == FB_BLANK_POWERDOWN */
137 /* Clear the screen before shutting down */
138 spi_write(spi, (const u8 *)&disoff, sizeof(u16));
140 l4f00242t03_lcd_powerdown(spi);
143 priv->lcd_state = power;
148 static struct lcd_ops l4f_ops = {
149 .set_power = l4f00242t03_lcd_power_set,
150 .get_power = l4f00242t03_lcd_power_get,
153 static int __devinit l4f00242t03_probe(struct spi_device *spi)
155 struct l4f00242t03_priv *priv;
156 struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
160 dev_err(&spi->dev, "Uninitialized platform data.\n");
164 priv = kzalloc(sizeof(struct l4f00242t03_priv), GFP_KERNEL);
167 dev_err(&spi->dev, "No memory for this device.\n");
171 dev_set_drvdata(&spi->dev, priv);
172 spi->bits_per_word = 9;
177 ret = gpio_request(pdata->reset_gpio, "lcd l4f00242t03 reset");
180 "Unable to get the lcd l4f00242t03 reset gpio.\n");
184 ret = gpio_direction_output(pdata->reset_gpio, 1);
188 ret = gpio_request(pdata->data_enable_gpio,
189 "lcd l4f00242t03 data enable");
192 "Unable to get the lcd l4f00242t03 data en gpio.\n");
196 ret = gpio_direction_output(pdata->data_enable_gpio, 0);
200 if (pdata->io_supply) {
201 priv->io_reg = regulator_get(NULL, pdata->io_supply);
203 if (IS_ERR(priv->io_reg)) {
204 pr_err("%s: Unable to get the IO regulator\n",
210 if (pdata->core_supply) {
211 priv->core_reg = regulator_get(NULL, pdata->core_supply);
213 if (IS_ERR(priv->core_reg)) {
214 pr_err("%s: Unable to get the core regulator\n",
220 priv->ld = lcd_device_register("l4f00242t03",
221 &spi->dev, priv, &l4f_ops);
222 if (IS_ERR(priv->ld)) {
223 ret = PTR_ERR(priv->ld);
228 l4f00242t03_reset(pdata->reset_gpio);
229 l4f00242t03_lcd_init(spi);
230 priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
231 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);
233 dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
239 regulator_put(priv->core_reg);
242 regulator_put(priv->io_reg);
244 gpio_free(pdata->data_enable_gpio);
246 gpio_free(pdata->reset_gpio);
253 static int __devexit l4f00242t03_remove(struct spi_device *spi)
255 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
256 struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data;
258 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
259 lcd_device_unregister(priv->ld);
261 dev_set_drvdata(&spi->dev, NULL);
263 gpio_free(pdata->data_enable_gpio);
264 gpio_free(pdata->reset_gpio);
267 regulator_put(priv->io_reg);
269 regulator_put(priv->core_reg);
276 static void l4f00242t03_shutdown(struct spi_device *spi)
278 struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);
281 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
285 static struct spi_driver l4f00242t03_driver = {
287 .name = "l4f00242t03",
288 .owner = THIS_MODULE,
290 .probe = l4f00242t03_probe,
291 .remove = __devexit_p(l4f00242t03_remove),
292 .shutdown = l4f00242t03_shutdown,
295 static __init int l4f00242t03_init(void)
297 return spi_register_driver(&l4f00242t03_driver);
300 static __exit void l4f00242t03_exit(void)
302 spi_unregister_driver(&l4f00242t03_driver);
305 module_init(l4f00242t03_init);
306 module_exit(l4f00242t03_exit);
308 MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
309 MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
310 MODULE_LICENSE("GPL v2");