1/*
2 * lms283gf05.c -- support for Samsung LMS283GF05 LCD
3 *
4 * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
5 *
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.
9 */
10
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>
17
18#include <linux/spi/spi.h>
19#include <linux/spi/lms283gf05.h>
20#include <linux/module.h>
21
22struct lms283gf05_state {
23	struct spi_device	*spi;
24	struct lcd_device	*ld;
25};
26
27struct lms283gf05_seq {
28	unsigned char		reg;
29	unsigned short		value;
30	unsigned char		delay;
31};
32
33/* Magic sequences supplied by manufacturer, for details refer to datasheet */
34static struct lms283gf05_seq disp_initseq[] = {
35	/* REG, VALUE, DELAY */
36	{ 0x07, 0x0000, 0 },
37	{ 0x13, 0x0000, 10 },
38
39	{ 0x11, 0x3004, 0 },
40	{ 0x14, 0x200F, 0 },
41	{ 0x10, 0x1a20, 0 },
42	{ 0x13, 0x0040, 50 },
43
44	{ 0x13, 0x0060, 0 },
45	{ 0x13, 0x0070, 200 },
46
47	{ 0x01, 0x0127, 0 },
48	{ 0x02,	0x0700, 0 },
49	{ 0x03, 0x1030, 0 },
50	{ 0x08, 0x0208, 0 },
51	{ 0x0B, 0x0620, 0 },
52	{ 0x0C, 0x0110, 0 },
53	{ 0x30, 0x0120, 0 },
54	{ 0x31, 0x0127, 0 },
55	{ 0x32, 0x0000, 0 },
56	{ 0x33, 0x0503, 0 },
57	{ 0x34, 0x0727, 0 },
58	{ 0x35, 0x0124, 0 },
59	{ 0x36, 0x0706, 0 },
60	{ 0x37, 0x0701, 0 },
61	{ 0x38, 0x0F00, 0 },
62	{ 0x39, 0x0F00, 0 },
63	{ 0x40, 0x0000, 0 },
64	{ 0x41, 0x0000, 0 },
65	{ 0x42, 0x013f, 0 },
66	{ 0x43, 0x0000, 0 },
67	{ 0x44, 0x013f, 0 },
68	{ 0x45, 0x0000, 0 },
69	{ 0x46, 0xef00, 0 },
70	{ 0x47, 0x013f, 0 },
71	{ 0x48, 0x0000, 0 },
72	{ 0x07, 0x0015, 30 },
73
74	{ 0x07, 0x0017, 0 },
75
76	{ 0x20, 0x0000, 0 },
77	{ 0x21, 0x0000, 0 },
78	{ 0x22, 0x0000, 0 }
79};
80
81static struct lms283gf05_seq disp_pdwnseq[] = {
82	{ 0x07, 0x0016, 30 },
83
84	{ 0x07, 0x0004, 0 },
85	{ 0x10, 0x0220, 20 },
86
87	{ 0x13, 0x0060, 50 },
88
89	{ 0x13, 0x0040, 50 },
90
91	{ 0x13, 0x0000, 0 },
92	{ 0x10, 0x0000, 0 }
93};
94
95
96static void lms283gf05_reset(unsigned long gpio, bool inverted)
97{
98	gpio_set_value(gpio, !inverted);
99	mdelay(100);
100	gpio_set_value(gpio, inverted);
101	mdelay(20);
102	gpio_set_value(gpio, !inverted);
103	mdelay(20);
104}
105
106static void lms283gf05_toggle(struct spi_device *spi,
107			struct lms283gf05_seq *seq, int sz)
108{
109	char buf[3];
110	int i;
111
112	for (i = 0; i < sz; i++) {
113		buf[0] = 0x74;
114		buf[1] = 0x00;
115		buf[2] = seq[i].reg;
116		spi_write(spi, buf, 3);
117
118		buf[0] = 0x76;
119		buf[1] = seq[i].value >> 8;
120		buf[2] = seq[i].value & 0xff;
121		spi_write(spi, buf, 3);
122
123		mdelay(seq[i].delay);
124	}
125}
126
127static int lms283gf05_power_set(struct lcd_device *ld, int power)
128{
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;
132
133	if (power <= FB_BLANK_NORMAL) {
134		if (pdata)
135			lms283gf05_reset(pdata->reset_gpio,
136					pdata->reset_inverted);
137		lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
138	} else {
139		lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
140		if (pdata)
141			gpio_set_value(pdata->reset_gpio,
142					pdata->reset_inverted);
143	}
144
145	return 0;
146}
147
148static struct lcd_ops lms_ops = {
149	.set_power	= lms283gf05_power_set,
150	.get_power	= NULL,
151};
152
153static int __devinit lms283gf05_probe(struct spi_device *spi)
154{
155	struct lms283gf05_state *st;
156	struct lms283gf05_pdata *pdata = spi->dev.platform_data;
157	struct lcd_device *ld;
158	int ret = 0;
159
160	if (pdata != NULL) {
161		ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET");
162		if (ret)
163			return ret;
164
165		ret = gpio_direction_output(pdata->reset_gpio,
166						!pdata->reset_inverted);
167		if (ret)
168			goto err;
169	}
170
171	st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL);
172	if (st == NULL) {
173		dev_err(&spi->dev, "No memory for device state\n");
174		ret = -ENOMEM;
175		goto err;
176	}
177
178	ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
179	if (IS_ERR(ld)) {
180		ret = PTR_ERR(ld);
181		goto err2;
182	}
183
184	st->spi = spi;
185	st->ld = ld;
186
187	dev_set_drvdata(&spi->dev, st);
188
189	/* kick in the LCD */
190	if (pdata)
191		lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
192	lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
193
194	return 0;
195
196err2:
197	kfree(st);
198err:
199	if (pdata != NULL)
200		gpio_free(pdata->reset_gpio);
201
202	return ret;
203}
204
205static int __devexit lms283gf05_remove(struct spi_device *spi)
206{
207	struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);
208	struct lms283gf05_pdata *pdata = st->spi->dev.platform_data;
209
210	lcd_device_unregister(st->ld);
211
212	if (pdata != NULL)
213		gpio_free(pdata->reset_gpio);
214
215	kfree(st);
216
217	return 0;
218}
219
220static struct spi_driver lms283gf05_driver = {
221	.driver = {
222		.name	= "lms283gf05",
223		.owner	= THIS_MODULE,
224	},
225	.probe		= lms283gf05_probe,
226	.remove		= __devexit_p(lms283gf05_remove),
227};
228
229module_spi_driver(lms283gf05_driver);
230
231MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
232MODULE_DESCRIPTION("LCD283GF05 LCD");
233MODULE_LICENSE("GPL v2");
234