Commit | Line | Data |
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18f65c79 HS |
1 | /* |
2 | * Power control for Samsung LTV350QV Quarter VGA LCD Panel | |
3 | * | |
4 | * Copyright (C) 2006, 2007 Atmel Corporation | |
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 | #include <linux/delay.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/fb.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/lcd.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/spi/spi.h> | |
17 | ||
18 | #include "ltv350qv.h" | |
19 | ||
20 | #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL) | |
21 | ||
22 | struct ltv350qv { | |
23 | struct spi_device *spi; | |
24 | u8 *buffer; | |
25 | int power; | |
26 | struct lcd_device *ld; | |
27 | }; | |
28 | ||
29 | /* | |
30 | * The power-on and power-off sequences are taken from the | |
31 | * LTV350QV-F04 data sheet from Samsung. The register definitions are | |
32 | * taken from the S6F2002 command list also from Samsung. Both | |
33 | * documents are distributed with the AVR32 Linux BSP CD from Atmel. | |
34 | * | |
35 | * There's still some voodoo going on here, but it's a lot better than | |
36 | * in the first incarnation of the driver where all we had was the raw | |
37 | * numbers from the initialization sequence. | |
38 | */ | |
39 | static int ltv350qv_write_reg(struct ltv350qv *lcd, u8 reg, u16 val) | |
40 | { | |
41 | struct spi_message msg; | |
42 | struct spi_transfer index_xfer = { | |
43 | .len = 3, | |
44 | .cs_change = 1, | |
45 | }; | |
46 | struct spi_transfer value_xfer = { | |
47 | .len = 3, | |
48 | }; | |
49 | ||
50 | spi_message_init(&msg); | |
51 | ||
52 | /* register index */ | |
53 | lcd->buffer[0] = LTV_OPC_INDEX; | |
54 | lcd->buffer[1] = 0x00; | |
55 | lcd->buffer[2] = reg & 0x7f; | |
56 | index_xfer.tx_buf = lcd->buffer; | |
57 | spi_message_add_tail(&index_xfer, &msg); | |
58 | ||
59 | /* register value */ | |
60 | lcd->buffer[4] = LTV_OPC_DATA; | |
61 | lcd->buffer[5] = val >> 8; | |
62 | lcd->buffer[6] = val; | |
63 | value_xfer.tx_buf = lcd->buffer + 4; | |
64 | spi_message_add_tail(&value_xfer, &msg); | |
65 | ||
66 | return spi_sync(lcd->spi, &msg); | |
67 | } | |
68 | ||
69 | /* The comments are taken straight from the data sheet */ | |
70 | static int ltv350qv_power_on(struct ltv350qv *lcd) | |
71 | { | |
72 | int ret; | |
73 | ||
74 | /* Power On Reset Display off State */ | |
75 | if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, 0x0000)) | |
76 | goto err; | |
77 | msleep(15); | |
78 | ||
79 | /* Power Setting Function 1 */ | |
80 | if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE)) | |
81 | goto err; | |
82 | if (ltv350qv_write_reg(lcd, LTV_PWRCTL2, LTV_VCOML_ENABLE)) | |
83 | goto err_power1; | |
84 | ||
85 | /* Power Setting Function 2 */ | |
86 | if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, | |
87 | LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5) | |
88 | | LTV_SUPPLY_CURRENT(5))) | |
89 | goto err_power2; | |
90 | ||
91 | msleep(55); | |
92 | ||
93 | /* Instruction Setting */ | |
94 | ret = ltv350qv_write_reg(lcd, LTV_IFCTL, | |
95 | LTV_NMD | LTV_REV | LTV_NL(0x1d)); | |
96 | ret |= ltv350qv_write_reg(lcd, LTV_DATACTL, | |
97 | LTV_DS_SAME | LTV_CHS_480 | |
98 | | LTV_DF_RGB | LTV_RGB_BGR); | |
99 | ret |= ltv350qv_write_reg(lcd, LTV_ENTRY_MODE, | |
100 | LTV_VSPL_ACTIVE_LOW | |
101 | | LTV_HSPL_ACTIVE_LOW | |
102 | | LTV_DPL_SAMPLE_RISING | |
103 | | LTV_EPL_ACTIVE_LOW | |
104 | | LTV_SS_RIGHT_TO_LEFT); | |
105 | ret |= ltv350qv_write_reg(lcd, LTV_GATECTL1, LTV_CLW(3)); | |
106 | ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2, | |
107 | LTV_NW_INV_1LINE | LTV_FWI(3)); | |
108 | ret |= ltv350qv_write_reg(lcd, LTV_VBP, 0x000a); | |
109 | ret |= ltv350qv_write_reg(lcd, LTV_HBP, 0x0021); | |
110 | ret |= ltv350qv_write_reg(lcd, LTV_SOTCTL, LTV_SDT(3) | LTV_EQ(0)); | |
111 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(0), 0x0103); | |
112 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(1), 0x0301); | |
113 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(2), 0x1f0f); | |
114 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(3), 0x1f0f); | |
115 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(4), 0x0707); | |
116 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(5), 0x0307); | |
117 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(6), 0x0707); | |
118 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(7), 0x0000); | |
119 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(8), 0x0004); | |
120 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(9), 0x0000); | |
121 | if (ret) | |
122 | goto err_settings; | |
123 | ||
124 | /* Wait more than 2 frames */ | |
125 | msleep(20); | |
126 | ||
127 | /* Display On Sequence */ | |
128 | ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1, | |
129 | LTV_VCOM_DISABLE | LTV_VCOMOUT_ENABLE | |
130 | | LTV_POWER_ON | LTV_DRIVE_CURRENT(5) | |
131 | | LTV_SUPPLY_CURRENT(5)); | |
132 | ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2, | |
133 | LTV_NW_INV_1LINE | LTV_DSC | LTV_FWI(3)); | |
134 | if (ret) | |
135 | goto err_disp_on; | |
136 | ||
137 | /* Display should now be ON. Phew. */ | |
138 | return 0; | |
139 | ||
140 | err_disp_on: | |
141 | /* | |
142 | * Try to recover. Error handling probably isn't very useful | |
143 | * at this point, just make a best effort to switch the panel | |
144 | * off. | |
145 | */ | |
146 | ltv350qv_write_reg(lcd, LTV_PWRCTL1, | |
147 | LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5) | |
148 | | LTV_SUPPLY_CURRENT(5)); | |
149 | ltv350qv_write_reg(lcd, LTV_GATECTL2, | |
150 | LTV_NW_INV_1LINE | LTV_FWI(3)); | |
151 | err_settings: | |
152 | err_power2: | |
153 | err_power1: | |
154 | ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000); | |
155 | msleep(1); | |
156 | err: | |
157 | ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE); | |
158 | return -EIO; | |
159 | } | |
160 | ||
161 | static int ltv350qv_power_off(struct ltv350qv *lcd) | |
162 | { | |
163 | int ret; | |
164 | ||
165 | /* Display Off Sequence */ | |
166 | ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1, | |
167 | LTV_VCOM_DISABLE | |
168 | | LTV_DRIVE_CURRENT(5) | |
169 | | LTV_SUPPLY_CURRENT(5)); | |
170 | ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2, | |
171 | LTV_NW_INV_1LINE | LTV_FWI(3)); | |
172 | ||
173 | /* Power down setting 1 */ | |
174 | ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000); | |
175 | ||
176 | /* Wait at least 1 ms */ | |
177 | msleep(1); | |
178 | ||
179 | /* Power down setting 2 */ | |
180 | ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE); | |
181 | ||
182 | /* | |
183 | * No point in trying to recover here. If we can't switch the | |
184 | * panel off, what are we supposed to do other than inform the | |
185 | * user about the failure? | |
186 | */ | |
187 | if (ret) | |
188 | return -EIO; | |
189 | ||
190 | /* Display power should now be OFF */ | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int ltv350qv_power(struct ltv350qv *lcd, int power) | |
195 | { | |
196 | int ret = 0; | |
197 | ||
198 | if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power)) | |
199 | ret = ltv350qv_power_on(lcd); | |
200 | else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power)) | |
201 | ret = ltv350qv_power_off(lcd); | |
202 | ||
203 | if (!ret) | |
204 | lcd->power = power; | |
205 | ||
206 | return ret; | |
207 | } | |
208 | ||
209 | static int ltv350qv_set_power(struct lcd_device *ld, int power) | |
210 | { | |
211 | struct ltv350qv *lcd = lcd_get_data(ld); | |
212 | ||
213 | return ltv350qv_power(lcd, power); | |
214 | } | |
215 | ||
216 | static int ltv350qv_get_power(struct lcd_device *ld) | |
217 | { | |
218 | struct ltv350qv *lcd = lcd_get_data(ld); | |
219 | ||
220 | return lcd->power; | |
221 | } | |
222 | ||
223 | static struct lcd_ops ltv_ops = { | |
224 | .get_power = ltv350qv_get_power, | |
225 | .set_power = ltv350qv_set_power, | |
226 | }; | |
227 | ||
228 | static int __devinit ltv350qv_probe(struct spi_device *spi) | |
229 | { | |
230 | struct ltv350qv *lcd; | |
231 | struct lcd_device *ld; | |
232 | int ret; | |
233 | ||
234 | lcd = kzalloc(sizeof(struct ltv350qv), GFP_KERNEL); | |
235 | if (!lcd) | |
236 | return -ENOMEM; | |
237 | ||
238 | lcd->spi = spi; | |
239 | lcd->power = FB_BLANK_POWERDOWN; | |
240 | lcd->buffer = kzalloc(8, GFP_KERNEL); | |
241 | ||
242 | ld = lcd_device_register("ltv350qv", &spi->dev, lcd, <v_ops); | |
243 | if (IS_ERR(ld)) { | |
244 | ret = PTR_ERR(ld); | |
245 | goto out_free_lcd; | |
246 | } | |
247 | lcd->ld = ld; | |
248 | ||
249 | ret = ltv350qv_power(lcd, FB_BLANK_UNBLANK); | |
250 | if (ret) | |
251 | goto out_unregister; | |
252 | ||
253 | dev_set_drvdata(&spi->dev, lcd); | |
254 | ||
255 | return 0; | |
256 | ||
257 | out_unregister: | |
258 | lcd_device_unregister(ld); | |
259 | out_free_lcd: | |
260 | kfree(lcd); | |
261 | return ret; | |
262 | } | |
263 | ||
264 | static int __devexit ltv350qv_remove(struct spi_device *spi) | |
265 | { | |
266 | struct ltv350qv *lcd = dev_get_drvdata(&spi->dev); | |
267 | ||
268 | ltv350qv_power(lcd, FB_BLANK_POWERDOWN); | |
269 | lcd_device_unregister(lcd->ld); | |
270 | kfree(lcd); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | #ifdef CONFIG_PM | |
276 | static int ltv350qv_suspend(struct spi_device *spi, pm_message_t state) | |
277 | { | |
278 | struct ltv350qv *lcd = dev_get_drvdata(&spi->dev); | |
279 | ||
280 | return ltv350qv_power(lcd, FB_BLANK_POWERDOWN); | |
281 | } | |
282 | ||
283 | static int ltv350qv_resume(struct spi_device *spi) | |
284 | { | |
285 | struct ltv350qv *lcd = dev_get_drvdata(&spi->dev); | |
286 | ||
287 | return ltv350qv_power(lcd, FB_BLANK_UNBLANK); | |
288 | } | |
289 | #else | |
290 | #define ltv350qv_suspend NULL | |
291 | #define ltv350qv_resume NULL | |
292 | #endif | |
293 | ||
294 | /* Power down all displays on reboot, poweroff or halt */ | |
295 | static void ltv350qv_shutdown(struct spi_device *spi) | |
296 | { | |
297 | struct ltv350qv *lcd = dev_get_drvdata(&spi->dev); | |
298 | ||
299 | ltv350qv_power(lcd, FB_BLANK_POWERDOWN); | |
300 | } | |
301 | ||
302 | static struct spi_driver ltv350qv_driver = { | |
303 | .driver = { | |
304 | .name = "ltv350qv", | |
305 | .bus = &spi_bus_type, | |
306 | .owner = THIS_MODULE, | |
307 | }, | |
308 | ||
309 | .probe = ltv350qv_probe, | |
310 | .remove = __devexit_p(ltv350qv_remove), | |
311 | .shutdown = ltv350qv_shutdown, | |
312 | .suspend = ltv350qv_suspend, | |
313 | .resume = ltv350qv_resume, | |
314 | }; | |
315 | ||
316 | static int __init ltv350qv_init(void) | |
317 | { | |
318 | return spi_register_driver(<v350qv_driver); | |
319 | } | |
320 | ||
321 | static void __exit ltv350qv_exit(void) | |
322 | { | |
323 | spi_unregister_driver(<v350qv_driver); | |
324 | } | |
325 | module_init(ltv350qv_init); | |
326 | module_exit(ltv350qv_exit); | |
327 | ||
328 | MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>"); | |
329 | MODULE_DESCRIPTION("Samsung LTV350QV LCD Driver"); | |
330 | MODULE_LICENSE("GPL"); |