2 * lms283gf05.c -- support for Samsung LMS283GF05 LCD
4 * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/device.h>
12 #include <linux/kernel.h>
13 #include <linux/delay.h>
14 #include <linux/gpio.h>
15 #include <linux/lcd.h>
17 #include <linux/spi/spi.h>
18 #include <linux/spi/lms283gf05.h>
20 struct lms283gf05_state {
21 struct spi_device *spi;
22 struct lcd_device *ld;
25 struct lms283gf05_seq {
31 /* Magic sequences supplied by manufacturer, for details refer to datasheet */
32 static struct lms283gf05_seq disp_initseq[] = {
33 /* REG, VALUE, DELAY */
43 { 0x13, 0x0070, 200 },
79 static struct lms283gf05_seq disp_pdwnseq[] = {
94 static void lms283gf05_reset(unsigned long gpio, bool inverted)
96 gpio_set_value(gpio, !inverted);
98 gpio_set_value(gpio, inverted);
100 gpio_set_value(gpio, !inverted);
104 static void lms283gf05_toggle(struct spi_device *spi,
105 struct lms283gf05_seq *seq, int sz)
110 for (i = 0; i < sz; i++) {
114 spi_write(spi, buf, 3);
117 buf[1] = seq[i].value >> 8;
118 buf[2] = seq[i].value & 0xff;
119 spi_write(spi, buf, 3);
121 mdelay(seq[i].delay);
125 static int lms283gf05_power_set(struct lcd_device *ld, int power)
127 struct lms283gf05_state *st = lcd_get_data(ld);
128 struct spi_device *spi = st->spi;
129 struct lms283gf05_pdata *pdata = spi->dev.platform_data;
133 lms283gf05_reset(pdata->reset_gpio,
134 pdata->reset_inverted);
135 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
137 lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
139 gpio_set_value(pdata->reset_gpio,
140 pdata->reset_inverted);
146 static struct lcd_ops lms_ops = {
147 .set_power = lms283gf05_power_set,
151 static int __devinit lms283gf05_probe(struct spi_device *spi)
153 struct lms283gf05_state *st;
154 struct lms283gf05_pdata *pdata = spi->dev.platform_data;
155 struct lcd_device *ld;
159 ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET");
163 ret = gpio_direction_output(pdata->reset_gpio,
164 !pdata->reset_inverted);
169 st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL);
171 dev_err(&spi->dev, "No memory for device state\n");
176 ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
185 dev_set_drvdata(&spi->dev, st);
187 /* kick in the LCD */
189 lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
190 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
198 gpio_free(pdata->reset_gpio);
203 static int __devexit lms283gf05_remove(struct spi_device *spi)
205 struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);
206 struct lms283gf05_pdata *pdata = st->spi->dev.platform_data;
208 lcd_device_unregister(st->ld);
211 gpio_free(pdata->reset_gpio);
218 static struct spi_driver lms283gf05_driver = {
220 .name = "lms283gf05",
221 .owner = THIS_MODULE,
223 .probe = lms283gf05_probe,
224 .remove = __devexit_p(lms283gf05_remove),
227 static __init int lms283gf05_init(void)
229 return spi_register_driver(&lms283gf05_driver);
232 static __exit void lms283gf05_exit(void)
234 spi_unregister_driver(&lms283gf05_driver);
237 module_init(lms283gf05_init);
238 module_exit(lms283gf05_exit);
240 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
241 MODULE_DESCRIPTION("LCD283GF05 LCD");
242 MODULE_LICENSE("GPL v2");