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>
21 struct lms283gf05_state {
22 struct spi_device *spi;
23 struct lcd_device *ld;
26 struct lms283gf05_seq {
32 /* Magic sequences supplied by manufacturer, for details refer to datasheet */
33 static struct lms283gf05_seq disp_initseq[] = {
34 /* REG, VALUE, DELAY */
44 { 0x13, 0x0070, 200 },
80 static struct lms283gf05_seq disp_pdwnseq[] = {
95 static void lms283gf05_reset(unsigned long gpio, bool inverted)
97 gpio_set_value(gpio, !inverted);
99 gpio_set_value(gpio, inverted);
101 gpio_set_value(gpio, !inverted);
105 static void lms283gf05_toggle(struct spi_device *spi,
106 struct lms283gf05_seq *seq, int sz)
111 for (i = 0; i < sz; i++) {
115 spi_write(spi, buf, 3);
118 buf[1] = seq[i].value >> 8;
119 buf[2] = seq[i].value & 0xff;
120 spi_write(spi, buf, 3);
122 mdelay(seq[i].delay);
126 static int lms283gf05_power_set(struct lcd_device *ld, int power)
128 struct lms283gf05_state *st = lcd_get_data(ld);
129 struct spi_device *spi = st->spi;
130 struct lms283gf05_pdata *pdata = spi->dev.platform_data;
132 if (power <= FB_BLANK_NORMAL) {
134 lms283gf05_reset(pdata->reset_gpio,
135 pdata->reset_inverted);
136 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
138 lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
140 gpio_set_value(pdata->reset_gpio,
141 pdata->reset_inverted);
147 static struct lcd_ops lms_ops = {
148 .set_power = lms283gf05_power_set,
152 static int __devinit lms283gf05_probe(struct spi_device *spi)
154 struct lms283gf05_state *st;
155 struct lms283gf05_pdata *pdata = spi->dev.platform_data;
156 struct lcd_device *ld;
160 ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET");
164 ret = gpio_direction_output(pdata->reset_gpio,
165 !pdata->reset_inverted);
170 st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL);
172 dev_err(&spi->dev, "No memory for device state\n");
177 ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
186 dev_set_drvdata(&spi->dev, st);
188 /* kick in the LCD */
190 lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
191 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
199 gpio_free(pdata->reset_gpio);
204 static int __devexit lms283gf05_remove(struct spi_device *spi)
206 struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);
207 struct lms283gf05_pdata *pdata = st->spi->dev.platform_data;
209 lcd_device_unregister(st->ld);
212 gpio_free(pdata->reset_gpio);
219 static struct spi_driver lms283gf05_driver = {
221 .name = "lms283gf05",
222 .owner = THIS_MODULE,
224 .probe = lms283gf05_probe,
225 .remove = __devexit_p(lms283gf05_remove),
228 static __init int lms283gf05_init(void)
230 return spi_register_driver(&lms283gf05_driver);
233 static __exit void lms283gf05_exit(void)
235 spi_unregister_driver(&lms283gf05_driver);
238 module_init(lms283gf05_init);
239 module_exit(lms283gf05_exit);
241 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
242 MODULE_DESCRIPTION("LCD283GF05 LCD");
243 MODULE_LICENSE("GPL v2");