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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
18f65c79 HS |
17 | #include <linux/spi/spi.h> |
18 | ||
19 | #include "ltv350qv.h" | |
20 | ||
21 | #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL) | |
22 | ||
23 | struct ltv350qv { | |
24 | struct spi_device *spi; | |
25 | u8 *buffer; | |
26 | int power; | |
27 | struct lcd_device *ld; | |
28 | }; | |
29 | ||
30 | /* | |
31 | * The power-on and power-off sequences are taken from the | |
32 | * LTV350QV-F04 data sheet from Samsung. The register definitions are | |
33 | * taken from the S6F2002 command list also from Samsung. Both | |
34 | * documents are distributed with the AVR32 Linux BSP CD from Atmel. | |
35 | * | |
36 | * There's still some voodoo going on here, but it's a lot better than | |
37 | * in the first incarnation of the driver where all we had was the raw | |
38 | * numbers from the initialization sequence. | |
39 | */ | |
40 | static int ltv350qv_write_reg(struct ltv350qv *lcd, u8 reg, u16 val) | |
41 | { | |
42 | struct spi_message msg; | |
43 | struct spi_transfer index_xfer = { | |
44 | .len = 3, | |
45 | .cs_change = 1, | |
46 | }; | |
47 | struct spi_transfer value_xfer = { | |
48 | .len = 3, | |
49 | }; | |
50 | ||
51 | spi_message_init(&msg); | |
52 | ||
53 | /* register index */ | |
54 | lcd->buffer[0] = LTV_OPC_INDEX; | |
55 | lcd->buffer[1] = 0x00; | |
56 | lcd->buffer[2] = reg & 0x7f; | |
57 | index_xfer.tx_buf = lcd->buffer; | |
58 | spi_message_add_tail(&index_xfer, &msg); | |
59 | ||
60 | /* register value */ | |
61 | lcd->buffer[4] = LTV_OPC_DATA; | |
62 | lcd->buffer[5] = val >> 8; | |
63 | lcd->buffer[6] = val; | |
64 | value_xfer.tx_buf = lcd->buffer + 4; | |
65 | spi_message_add_tail(&value_xfer, &msg); | |
66 | ||
67 | return spi_sync(lcd->spi, &msg); | |
68 | } | |
69 | ||
70 | /* The comments are taken straight from the data sheet */ | |
71 | static int ltv350qv_power_on(struct ltv350qv *lcd) | |
72 | { | |
73 | int ret; | |
74 | ||
75 | /* Power On Reset Display off State */ | |
76 | if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, 0x0000)) | |
77 | goto err; | |
78 | msleep(15); | |
79 | ||
80 | /* Power Setting Function 1 */ | |
81 | if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE)) | |
82 | goto err; | |
83 | if (ltv350qv_write_reg(lcd, LTV_PWRCTL2, LTV_VCOML_ENABLE)) | |
84 | goto err_power1; | |
85 | ||
86 | /* Power Setting Function 2 */ | |
87 | if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, | |
88 | LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5) | |
89 | | LTV_SUPPLY_CURRENT(5))) | |
90 | goto err_power2; | |
91 | ||
92 | msleep(55); | |
93 | ||
94 | /* Instruction Setting */ | |
95 | ret = ltv350qv_write_reg(lcd, LTV_IFCTL, | |
96 | LTV_NMD | LTV_REV | LTV_NL(0x1d)); | |
97 | ret |= ltv350qv_write_reg(lcd, LTV_DATACTL, | |
98 | LTV_DS_SAME | LTV_CHS_480 | |
99 | | LTV_DF_RGB | LTV_RGB_BGR); | |
100 | ret |= ltv350qv_write_reg(lcd, LTV_ENTRY_MODE, | |
101 | LTV_VSPL_ACTIVE_LOW | |
102 | | LTV_HSPL_ACTIVE_LOW | |
103 | | LTV_DPL_SAMPLE_RISING | |
104 | | LTV_EPL_ACTIVE_LOW | |
105 | | LTV_SS_RIGHT_TO_LEFT); | |
106 | ret |= ltv350qv_write_reg(lcd, LTV_GATECTL1, LTV_CLW(3)); | |
107 | ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2, | |
108 | LTV_NW_INV_1LINE | LTV_FWI(3)); | |
109 | ret |= ltv350qv_write_reg(lcd, LTV_VBP, 0x000a); | |
110 | ret |= ltv350qv_write_reg(lcd, LTV_HBP, 0x0021); | |
111 | ret |= ltv350qv_write_reg(lcd, LTV_SOTCTL, LTV_SDT(3) | LTV_EQ(0)); | |
112 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(0), 0x0103); | |
113 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(1), 0x0301); | |
114 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(2), 0x1f0f); | |
115 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(3), 0x1f0f); | |
116 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(4), 0x0707); | |
117 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(5), 0x0307); | |
118 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(6), 0x0707); | |
119 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(7), 0x0000); | |
120 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(8), 0x0004); | |
121 | ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(9), 0x0000); | |
122 | if (ret) | |
123 | goto err_settings; | |
124 | ||
125 | /* Wait more than 2 frames */ | |
126 | msleep(20); | |
127 | ||
128 | /* Display On Sequence */ | |
129 | ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1, | |
130 | LTV_VCOM_DISABLE | LTV_VCOMOUT_ENABLE | |
131 | | LTV_POWER_ON | LTV_DRIVE_CURRENT(5) | |
132 | | LTV_SUPPLY_CURRENT(5)); | |
133 | ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2, | |
134 | LTV_NW_INV_1LINE | LTV_DSC | LTV_FWI(3)); | |
135 | if (ret) | |
136 | goto err_disp_on; | |
137 | ||
138 | /* Display should now be ON. Phew. */ | |
139 | return 0; | |
140 | ||
141 | err_disp_on: | |
142 | /* | |
143 | * Try to recover. Error handling probably isn't very useful | |
144 | * at this point, just make a best effort to switch the panel | |
145 | * off. | |
146 | */ | |
147 | ltv350qv_write_reg(lcd, LTV_PWRCTL1, | |
148 | LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5) | |
149 | | LTV_SUPPLY_CURRENT(5)); | |
150 | ltv350qv_write_reg(lcd, LTV_GATECTL2, | |
151 | LTV_NW_INV_1LINE | LTV_FWI(3)); | |
152 | err_settings: | |
153 | err_power2: | |
154 | err_power1: | |
155 | ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000); | |
156 | msleep(1); | |
157 | err: | |
158 | ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE); | |
159 | return -EIO; | |
160 | } | |
161 | ||
162 | static int ltv350qv_power_off(struct ltv350qv *lcd) | |
163 | { | |
164 | int ret; | |
165 | ||
166 | /* Display Off Sequence */ | |
167 | ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1, | |
168 | LTV_VCOM_DISABLE | |
169 | | LTV_DRIVE_CURRENT(5) | |
170 | | LTV_SUPPLY_CURRENT(5)); | |
171 | ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2, | |
172 | LTV_NW_INV_1LINE | LTV_FWI(3)); | |
173 | ||
174 | /* Power down setting 1 */ | |
175 | ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000); | |
176 | ||
177 | /* Wait at least 1 ms */ | |
178 | msleep(1); | |
179 | ||
180 | /* Power down setting 2 */ | |
181 | ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE); | |
182 | ||
183 | /* | |
184 | * No point in trying to recover here. If we can't switch the | |
185 | * panel off, what are we supposed to do other than inform the | |
186 | * user about the failure? | |
187 | */ | |
188 | if (ret) | |
189 | return -EIO; | |
190 | ||
191 | /* Display power should now be OFF */ | |
192 | return 0; | |
193 | } | |
194 | ||
195 | static int ltv350qv_power(struct ltv350qv *lcd, int power) | |
196 | { | |
197 | int ret = 0; | |
198 | ||
199 | if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power)) | |
200 | ret = ltv350qv_power_on(lcd); | |
201 | else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power)) | |
202 | ret = ltv350qv_power_off(lcd); | |
203 | ||
204 | if (!ret) | |
205 | lcd->power = power; | |
206 | ||
207 | return ret; | |
208 | } | |
209 | ||
210 | static int ltv350qv_set_power(struct lcd_device *ld, int power) | |
211 | { | |
212 | struct ltv350qv *lcd = lcd_get_data(ld); | |
213 | ||
214 | return ltv350qv_power(lcd, power); | |
215 | } | |
216 | ||
217 | static int ltv350qv_get_power(struct lcd_device *ld) | |
218 | { | |
219 | struct ltv350qv *lcd = lcd_get_data(ld); | |
220 | ||
221 | return lcd->power; | |
222 | } | |
223 | ||
224 | static struct lcd_ops ltv_ops = { | |
225 | .get_power = ltv350qv_get_power, | |
226 | .set_power = ltv350qv_set_power, | |
227 | }; | |
228 | ||
229 | static int __devinit ltv350qv_probe(struct spi_device *spi) | |
230 | { | |
231 | struct ltv350qv *lcd; | |
232 | struct lcd_device *ld; | |
233 | int ret; | |
234 | ||
235 | lcd = kzalloc(sizeof(struct ltv350qv), GFP_KERNEL); | |
236 | if (!lcd) | |
237 | return -ENOMEM; | |
238 | ||
239 | lcd->spi = spi; | |
240 | lcd->power = FB_BLANK_POWERDOWN; | |
241 | lcd->buffer = kzalloc(8, GFP_KERNEL); | |
242 | ||
243 | ld = lcd_device_register("ltv350qv", &spi->dev, lcd, <v_ops); | |
244 | if (IS_ERR(ld)) { | |
245 | ret = PTR_ERR(ld); | |
246 | goto out_free_lcd; | |
247 | } | |
248 | lcd->ld = ld; | |
249 | ||
250 | ret = ltv350qv_power(lcd, FB_BLANK_UNBLANK); | |
251 | if (ret) | |
252 | goto out_unregister; | |
253 | ||
254 | dev_set_drvdata(&spi->dev, lcd); | |
255 | ||
256 | return 0; | |
257 | ||
258 | out_unregister: | |
259 | lcd_device_unregister(ld); | |
260 | out_free_lcd: | |
261 | kfree(lcd); | |
262 | return ret; | |
263 | } | |
264 | ||
265 | static int __devexit ltv350qv_remove(struct spi_device *spi) | |
266 | { | |
267 | struct ltv350qv *lcd = dev_get_drvdata(&spi->dev); | |
268 | ||
269 | ltv350qv_power(lcd, FB_BLANK_POWERDOWN); | |
270 | lcd_device_unregister(lcd->ld); | |
271 | kfree(lcd); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | #ifdef CONFIG_PM | |
277 | static int ltv350qv_suspend(struct spi_device *spi, pm_message_t state) | |
278 | { | |
279 | struct ltv350qv *lcd = dev_get_drvdata(&spi->dev); | |
280 | ||
281 | return ltv350qv_power(lcd, FB_BLANK_POWERDOWN); | |
282 | } | |
283 | ||
284 | static int ltv350qv_resume(struct spi_device *spi) | |
285 | { | |
286 | struct ltv350qv *lcd = dev_get_drvdata(&spi->dev); | |
287 | ||
288 | return ltv350qv_power(lcd, FB_BLANK_UNBLANK); | |
289 | } | |
290 | #else | |
291 | #define ltv350qv_suspend NULL | |
292 | #define ltv350qv_resume NULL | |
293 | #endif | |
294 | ||
295 | /* Power down all displays on reboot, poweroff or halt */ | |
296 | static void ltv350qv_shutdown(struct spi_device *spi) | |
297 | { | |
298 | struct ltv350qv *lcd = dev_get_drvdata(&spi->dev); | |
299 | ||
300 | ltv350qv_power(lcd, FB_BLANK_POWERDOWN); | |
301 | } | |
302 | ||
303 | static struct spi_driver ltv350qv_driver = { | |
304 | .driver = { | |
305 | .name = "ltv350qv", | |
306 | .bus = &spi_bus_type, | |
307 | .owner = THIS_MODULE, | |
308 | }, | |
309 | ||
310 | .probe = ltv350qv_probe, | |
311 | .remove = __devexit_p(ltv350qv_remove), | |
312 | .shutdown = ltv350qv_shutdown, | |
313 | .suspend = ltv350qv_suspend, | |
314 | .resume = ltv350qv_resume, | |
315 | }; | |
316 | ||
317 | static int __init ltv350qv_init(void) | |
318 | { | |
319 | return spi_register_driver(<v350qv_driver); | |
320 | } | |
321 | ||
322 | static void __exit ltv350qv_exit(void) | |
323 | { | |
324 | spi_unregister_driver(<v350qv_driver); | |
325 | } | |
326 | module_init(ltv350qv_init); | |
327 | module_exit(ltv350qv_exit); | |
328 | ||
329 | MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>"); | |
330 | MODULE_DESCRIPTION("Samsung LTV350QV LCD Driver"); | |
331 | MODULE_LICENSE("GPL"); | |
e0626e38 | 332 | MODULE_ALIAS("spi:ltv350qv"); |