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/slab.h>
15 #include <linux/gpio.h>
16 #include <linux/lcd.h>
18 #include <linux/spi/spi.h>
19 #include <linux/spi/lms283gf05.h>
20 #include <linux/module.h>
22 struct lms283gf05_state {
23 struct spi_device *spi;
24 struct lcd_device *ld;
27 struct lms283gf05_seq {
33 /* Magic sequences supplied by manufacturer, for details refer to datasheet */
34 static struct lms283gf05_seq disp_initseq[] = {
35 /* REG, VALUE, DELAY */
45 { 0x13, 0x0070, 200 },
81 static struct lms283gf05_seq disp_pdwnseq[] = {
96 static void lms283gf05_reset(unsigned long gpio, bool inverted)
98 gpio_set_value(gpio, !inverted);
100 gpio_set_value(gpio, inverted);
102 gpio_set_value(gpio, !inverted);
106 static void lms283gf05_toggle(struct spi_device *spi,
107 struct lms283gf05_seq *seq, int sz)
112 for (i = 0; i < sz; i++) {
116 spi_write(spi, buf, 3);
119 buf[1] = seq[i].value >> 8;
120 buf[2] = seq[i].value & 0xff;
121 spi_write(spi, buf, 3);
123 mdelay(seq[i].delay);
127 static int lms283gf05_power_set(struct lcd_device *ld, int power)
129 struct lms283gf05_state *st = lcd_get_data(ld);
130 struct spi_device *spi = st->spi;
131 struct lms283gf05_pdata *pdata = spi->dev.platform_data;
133 if (power <= FB_BLANK_NORMAL) {
135 lms283gf05_reset(pdata->reset_gpio,
136 pdata->reset_inverted);
137 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
139 lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
141 gpio_set_value(pdata->reset_gpio,
142 pdata->reset_inverted);
148 static struct lcd_ops lms_ops = {
149 .set_power = lms283gf05_power_set,
153 static int __devinit lms283gf05_probe(struct spi_device *spi)
155 struct lms283gf05_state *st;
156 struct lms283gf05_pdata *pdata = spi->dev.platform_data;
157 struct lcd_device *ld;
161 ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET");
165 ret = gpio_direction_output(pdata->reset_gpio,
166 !pdata->reset_inverted);
171 st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL);
173 dev_err(&spi->dev, "No memory for device state\n");
178 ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
187 dev_set_drvdata(&spi->dev, st);
189 /* kick in the LCD */
191 lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
192 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
200 gpio_free(pdata->reset_gpio);
205 static int __devexit lms283gf05_remove(struct spi_device *spi)
207 struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);
208 struct lms283gf05_pdata *pdata = st->spi->dev.platform_data;
210 lcd_device_unregister(st->ld);
213 gpio_free(pdata->reset_gpio);
220 static struct spi_driver lms283gf05_driver = {
222 .name = "lms283gf05",
223 .owner = THIS_MODULE,
225 .probe = lms283gf05_probe,
226 .remove = __devexit_p(lms283gf05_remove),
229 static __init int lms283gf05_init(void)
231 return spi_register_driver(&lms283gf05_driver);
234 static __exit void lms283gf05_exit(void)
236 spi_unregister_driver(&lms283gf05_driver);
239 module_init(lms283gf05_init);
240 module_exit(lms283gf05_exit);
242 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
243 MODULE_DESCRIPTION("LCD283GF05 LCD");
244 MODULE_LICENSE("GPL v2");