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5036cc41 MV |
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/gpio.h> | |
15 | #include <linux/lcd.h> | |
16 | ||
17 | #include <linux/spi/spi.h> | |
18 | #include <linux/spi/lms283gf05.h> | |
19 | ||
20 | struct lms283gf05_state { | |
21 | struct spi_device *spi; | |
22 | struct lcd_device *ld; | |
23 | }; | |
24 | ||
25 | struct lms283gf05_seq { | |
26 | unsigned char reg; | |
27 | unsigned short value; | |
28 | unsigned char delay; | |
29 | }; | |
30 | ||
31 | /* Magic sequences supplied by manufacturer, for details refer to datasheet */ | |
32 | static struct lms283gf05_seq disp_initseq[] = { | |
33 | /* REG, VALUE, DELAY */ | |
34 | { 0x07, 0x0000, 0 }, | |
35 | { 0x13, 0x0000, 10 }, | |
36 | ||
37 | { 0x11, 0x3004, 0 }, | |
38 | { 0x14, 0x200F, 0 }, | |
39 | { 0x10, 0x1a20, 0 }, | |
40 | { 0x13, 0x0040, 50 }, | |
41 | ||
42 | { 0x13, 0x0060, 0 }, | |
43 | { 0x13, 0x0070, 200 }, | |
44 | ||
45 | { 0x01, 0x0127, 0 }, | |
46 | { 0x02, 0x0700, 0 }, | |
47 | { 0x03, 0x1030, 0 }, | |
48 | { 0x08, 0x0208, 0 }, | |
49 | { 0x0B, 0x0620, 0 }, | |
50 | { 0x0C, 0x0110, 0 }, | |
51 | { 0x30, 0x0120, 0 }, | |
52 | { 0x31, 0x0127, 0 }, | |
53 | { 0x32, 0x0000, 0 }, | |
54 | { 0x33, 0x0503, 0 }, | |
55 | { 0x34, 0x0727, 0 }, | |
56 | { 0x35, 0x0124, 0 }, | |
57 | { 0x36, 0x0706, 0 }, | |
58 | { 0x37, 0x0701, 0 }, | |
59 | { 0x38, 0x0F00, 0 }, | |
60 | { 0x39, 0x0F00, 0 }, | |
61 | { 0x40, 0x0000, 0 }, | |
62 | { 0x41, 0x0000, 0 }, | |
63 | { 0x42, 0x013f, 0 }, | |
64 | { 0x43, 0x0000, 0 }, | |
65 | { 0x44, 0x013f, 0 }, | |
66 | { 0x45, 0x0000, 0 }, | |
67 | { 0x46, 0xef00, 0 }, | |
68 | { 0x47, 0x013f, 0 }, | |
69 | { 0x48, 0x0000, 0 }, | |
70 | { 0x07, 0x0015, 30 }, | |
71 | ||
72 | { 0x07, 0x0017, 0 }, | |
73 | ||
74 | { 0x20, 0x0000, 0 }, | |
75 | { 0x21, 0x0000, 0 }, | |
76 | { 0x22, 0x0000, 0 } | |
77 | }; | |
78 | ||
79 | static struct lms283gf05_seq disp_pdwnseq[] = { | |
80 | { 0x07, 0x0016, 30 }, | |
81 | ||
82 | { 0x07, 0x0004, 0 }, | |
83 | { 0x10, 0x0220, 20 }, | |
84 | ||
85 | { 0x13, 0x0060, 50 }, | |
86 | ||
87 | { 0x13, 0x0040, 50 }, | |
88 | ||
89 | { 0x13, 0x0000, 0 }, | |
90 | { 0x10, 0x0000, 0 } | |
91 | }; | |
92 | ||
93 | ||
94 | static void lms283gf05_reset(unsigned long gpio, bool inverted) | |
95 | { | |
96 | gpio_set_value(gpio, !inverted); | |
97 | mdelay(100); | |
98 | gpio_set_value(gpio, inverted); | |
99 | mdelay(20); | |
100 | gpio_set_value(gpio, !inverted); | |
101 | mdelay(20); | |
102 | } | |
103 | ||
104 | static void lms283gf05_toggle(struct spi_device *spi, | |
105 | struct lms283gf05_seq *seq, int sz) | |
106 | { | |
107 | char buf[3]; | |
108 | int i; | |
109 | ||
110 | for (i = 0; i < sz; i++) { | |
111 | buf[0] = 0x74; | |
112 | buf[1] = 0x00; | |
113 | buf[2] = seq[i].reg; | |
114 | spi_write(spi, buf, 3); | |
115 | ||
116 | buf[0] = 0x76; | |
117 | buf[1] = seq[i].value >> 8; | |
118 | buf[2] = seq[i].value & 0xff; | |
119 | spi_write(spi, buf, 3); | |
120 | ||
121 | mdelay(seq[i].delay); | |
122 | } | |
123 | } | |
124 | ||
125 | static int lms283gf05_power_set(struct lcd_device *ld, int power) | |
126 | { | |
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; | |
130 | ||
131 | if (power) { | |
132 | if (pdata) | |
133 | lms283gf05_reset(pdata->reset_gpio, | |
134 | pdata->reset_inverted); | |
135 | lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); | |
136 | } else { | |
137 | lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq)); | |
138 | if (pdata) | |
139 | gpio_set_value(pdata->reset_gpio, | |
140 | pdata->reset_inverted); | |
141 | } | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static struct lcd_ops lms_ops = { | |
147 | .set_power = lms283gf05_power_set, | |
148 | .get_power = NULL, | |
149 | }; | |
150 | ||
151 | static int __devinit lms283gf05_probe(struct spi_device *spi) | |
152 | { | |
153 | struct lms283gf05_state *st; | |
154 | struct lms283gf05_pdata *pdata = spi->dev.platform_data; | |
155 | struct lcd_device *ld; | |
156 | int ret = 0; | |
157 | ||
158 | if (pdata != NULL) { | |
159 | ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET"); | |
160 | if (ret) | |
161 | return ret; | |
162 | ||
163 | ret = gpio_direction_output(pdata->reset_gpio, | |
164 | !pdata->reset_inverted); | |
165 | if (ret) | |
166 | goto err; | |
167 | } | |
168 | ||
169 | st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL); | |
170 | if (st == NULL) { | |
171 | dev_err(&spi->dev, "No memory for device state\n"); | |
172 | ret = -ENOMEM; | |
173 | goto err; | |
174 | } | |
175 | ||
176 | ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops); | |
177 | if (IS_ERR(ld)) { | |
178 | ret = PTR_ERR(ld); | |
179 | goto err2; | |
180 | } | |
181 | ||
182 | st->spi = spi; | |
183 | st->ld = ld; | |
184 | ||
185 | dev_set_drvdata(&spi->dev, st); | |
186 | ||
187 | /* kick in the LCD */ | |
188 | if (pdata) | |
189 | lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted); | |
190 | lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); | |
191 | ||
192 | return 0; | |
193 | ||
194 | err2: | |
195 | kfree(st); | |
196 | err: | |
197 | if (pdata != NULL) | |
198 | gpio_free(pdata->reset_gpio); | |
199 | ||
200 | return ret; | |
201 | } | |
202 | ||
203 | static int __devexit lms283gf05_remove(struct spi_device *spi) | |
204 | { | |
205 | struct lms283gf05_state *st = dev_get_drvdata(&spi->dev); | |
206 | struct lms283gf05_pdata *pdata = st->spi->dev.platform_data; | |
207 | ||
208 | lcd_device_unregister(st->ld); | |
209 | ||
210 | if (pdata != NULL) | |
211 | gpio_free(pdata->reset_gpio); | |
212 | ||
213 | kfree(st); | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
218 | static struct spi_driver lms283gf05_driver = { | |
219 | .driver = { | |
220 | .name = "lms283gf05", | |
221 | .owner = THIS_MODULE, | |
222 | }, | |
223 | .probe = lms283gf05_probe, | |
224 | .remove = __devexit_p(lms283gf05_remove), | |
225 | }; | |
226 | ||
227 | static __init int lms283gf05_init(void) | |
228 | { | |
229 | return spi_register_driver(&lms283gf05_driver); | |
230 | } | |
231 | ||
232 | static __exit void lms283gf05_exit(void) | |
233 | { | |
234 | spi_unregister_driver(&lms283gf05_driver); | |
235 | } | |
236 | ||
237 | module_init(lms283gf05_init); | |
238 | module_exit(lms283gf05_exit); | |
239 | ||
240 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); | |
241 | MODULE_DESCRIPTION("LCD283GF05 LCD"); | |
242 | MODULE_LICENSE("GPL v2"); |