87f0d673143a219123bb128ada5c4cc3a12457c9
[openwrt/svn-archive/archive.git] / target / linux / s3c24xx / files-2.6.30 / drivers / video / display / jbt6k74.c
1 /* Linux kernel driver for the tpo JBT6K74-AS LCM ASIC
2 *
3 * Copyright (C) 2006-2007 by Openmoko, Inc.
4 * Author: Harald Welte <laforge@openmoko.org>,
5 * Stefan Schmidt <stefan@openmoko.org>
6 * Copyright (C) 2008 by Harald Welte <laforge@openmoko.org>
7 * Copyright (C) 2009 by Lars-Peter Clausen <lars@metafoo.de>
8 * All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
23 * MA 02111-1307 USA
24 *
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/types.h>
29 #include <linux/module.h>
30 #include <linux/device.h>
31 #include <linux/platform_device.h>
32 #include <linux/delay.h>
33 #include <linux/workqueue.h>
34 #include <linux/jbt6k74.h>
35 #include <linux/fb.h>
36 #include <linux/lcd.h>
37 #include <linux/time.h>
38
39 enum jbt_register {
40 JBT_REG_SLEEP_IN = 0x10,
41 JBT_REG_SLEEP_OUT = 0x11,
42
43 JBT_REG_DISPLAY_OFF = 0x28,
44 JBT_REG_DISPLAY_ON = 0x29,
45
46 JBT_REG_RGB_FORMAT = 0x3a,
47 JBT_REG_QUAD_RATE = 0x3b,
48
49 JBT_REG_POWER_ON_OFF = 0xb0,
50 JBT_REG_BOOSTER_OP = 0xb1,
51 JBT_REG_BOOSTER_MODE = 0xb2,
52 JBT_REG_BOOSTER_FREQ = 0xb3,
53 JBT_REG_OPAMP_SYSCLK = 0xb4,
54 JBT_REG_VSC_VOLTAGE = 0xb5,
55 JBT_REG_VCOM_VOLTAGE = 0xb6,
56 JBT_REG_EXT_DISPL = 0xb7,
57 JBT_REG_OUTPUT_CONTROL = 0xb8,
58 JBT_REG_DCCLK_DCEV = 0xb9,
59 JBT_REG_DISPLAY_MODE1 = 0xba,
60 JBT_REG_DISPLAY_MODE2 = 0xbb,
61 JBT_REG_DISPLAY_MODE = 0xbc,
62 JBT_REG_ASW_SLEW = 0xbd,
63 JBT_REG_DUMMY_DISPLAY = 0xbe,
64 JBT_REG_DRIVE_SYSTEM = 0xbf,
65
66 JBT_REG_SLEEP_OUT_FR_A = 0xc0,
67 JBT_REG_SLEEP_OUT_FR_B = 0xc1,
68 JBT_REG_SLEEP_OUT_FR_C = 0xc2,
69 JBT_REG_SLEEP_IN_LCCNT_D = 0xc3,
70 JBT_REG_SLEEP_IN_LCCNT_E = 0xc4,
71 JBT_REG_SLEEP_IN_LCCNT_F = 0xc5,
72 JBT_REG_SLEEP_IN_LCCNT_G = 0xc6,
73
74 JBT_REG_GAMMA1_FINE_1 = 0xc7,
75 JBT_REG_GAMMA1_FINE_2 = 0xc8,
76 JBT_REG_GAMMA1_INCLINATION = 0xc9,
77 JBT_REG_GAMMA1_BLUE_OFFSET = 0xca,
78
79 /* VGA */
80 JBT_REG_BLANK_CONTROL = 0xcf,
81 JBT_REG_BLANK_TH_TV = 0xd0,
82 JBT_REG_CKV_ON_OFF = 0xd1,
83 JBT_REG_CKV_1_2 = 0xd2,
84 JBT_REG_OEV_TIMING = 0xd3,
85 JBT_REG_ASW_TIMING_1 = 0xd4,
86 JBT_REG_ASW_TIMING_2 = 0xd5,
87
88 /* QVGA */
89 JBT_REG_BLANK_CONTROL_QVGA = 0xd6,
90 JBT_REG_BLANK_TH_TV_QVGA = 0xd7,
91 JBT_REG_CKV_ON_OFF_QVGA = 0xd8,
92 JBT_REG_CKV_1_2_QVGA = 0xd9,
93 JBT_REG_OEV_TIMING_QVGA = 0xde,
94 JBT_REG_ASW_TIMING_1_QVGA = 0xdf,
95 JBT_REG_ASW_TIMING_2_QVGA = 0xe0,
96
97
98 JBT_REG_HCLOCK_VGA = 0xec,
99 JBT_REG_HCLOCK_QVGA = 0xed,
100
101 };
102
103 enum jbt_resolution {
104 JBT_RESOLUTION_VGA,
105 JBT_RESOLUTION_QVGA,
106 };
107
108 enum jbt_power_mode {
109 JBT_POWER_MODE_DEEP_STANDBY,
110 JBT_POWER_MODE_SLEEP,
111 JBT_POWER_MODE_NORMAL,
112 };
113
114 static const char *jbt_power_mode_names[] = {
115 [JBT_POWER_MODE_DEEP_STANDBY] = "deep-standby",
116 [JBT_POWER_MODE_SLEEP] = "sleep",
117 [JBT_POWER_MODE_NORMAL] = "normal",
118 };
119
120 static const char *jbt_resolution_names[] = {
121 [JBT_RESOLUTION_VGA] = "vga",
122 [JBT_RESOLUTION_QVGA] = "qvga",
123 };
124
125 struct jbt_info {
126 struct mutex lock; /* protects this structure */
127 enum jbt_resolution resolution;
128 enum jbt_power_mode power_mode;
129 enum jbt_power_mode suspend_mode;
130 int suspended;
131 struct spi_device *spi_dev;
132 struct lcd_device *lcd_dev;
133 unsigned long last_sleep;
134 struct delayed_work blank_work;
135 int blank_mode;
136 u16 tx_buf[4];
137 u16 reg_cache[0xEE];
138 };
139
140 #define JBT_COMMAND 0x000
141 #define JBT_DATA 0x100
142
143 static int jbt_reg_write_nodata(struct jbt_info *jbt, u8 reg)
144 {
145 int rc;
146
147 jbt->tx_buf[0] = JBT_COMMAND | reg;
148 rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
149 1*sizeof(u16));
150 if (rc == 0)
151 jbt->reg_cache[reg] = 0;
152 else
153 dev_err(&jbt->spi_dev->dev, "jbt_reg_write_nodata spi_write ret %d\n",
154 rc);
155
156 return rc;
157 }
158
159
160 static int jbt_reg_write(struct jbt_info *jbt, u8 reg, u8 data)
161 {
162 int rc;
163
164 jbt->tx_buf[0] = JBT_COMMAND | reg;
165 jbt->tx_buf[1] = JBT_DATA | data;
166 rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
167 2*sizeof(u16));
168 if (rc == 0)
169 jbt->reg_cache[reg] = data;
170 else
171 dev_err(&jbt->spi_dev->dev, "jbt_reg_write spi_write ret %d\n", rc);
172
173 return rc;
174 }
175
176 static int jbt_reg_write16(struct jbt_info *jbt, u8 reg, u16 data)
177 {
178 int rc;
179
180 jbt->tx_buf[0] = JBT_COMMAND | reg;
181 jbt->tx_buf[1] = JBT_DATA | (data >> 8);
182 jbt->tx_buf[2] = JBT_DATA | (data & 0xff);
183
184 rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
185 3*sizeof(u16));
186 if (rc == 0)
187 jbt->reg_cache[reg] = data;
188 else
189 dev_err(&jbt->spi_dev->dev, "jbt_reg_write16 spi_write ret %d\n", rc);
190
191 return rc;
192 }
193
194 static int jbt_init_regs(struct jbt_info *jbt)
195 {
196 int rc;
197
198 dev_dbg(&jbt->spi_dev->dev, "entering %cVGA mode\n",
199 jbt->resolution == JBT_RESOLUTION_QVGA ? 'Q' : ' ');
200
201 rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE1, 0x01);
202 rc |= jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE2, 0x00);
203 rc |= jbt_reg_write(jbt, JBT_REG_RGB_FORMAT, 0x60);
204 rc |= jbt_reg_write(jbt, JBT_REG_DRIVE_SYSTEM, 0x10);
205 rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_OP, 0x56);
206 rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_MODE, 0x33);
207 rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_FREQ, 0x11);
208 rc |= jbt_reg_write(jbt, JBT_REG_OPAMP_SYSCLK, 0x02);
209 rc |= jbt_reg_write(jbt, JBT_REG_VSC_VOLTAGE, 0x2b);
210 rc |= jbt_reg_write(jbt, JBT_REG_VCOM_VOLTAGE, 0x40);
211 rc |= jbt_reg_write(jbt, JBT_REG_EXT_DISPL, 0x03);
212 rc |= jbt_reg_write(jbt, JBT_REG_DCCLK_DCEV, 0x04);
213 /*
214 * default of 0x02 in JBT_REG_ASW_SLEW responsible for 72Hz requirement
215 * to avoid red / blue flicker
216 */
217 rc |= jbt_reg_write(jbt, JBT_REG_ASW_SLEW, 0x04 | (1 << 5));
218 rc |= jbt_reg_write(jbt, JBT_REG_DUMMY_DISPLAY, 0x00);
219
220 rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_A, 0x11);
221 rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_B, 0x11);
222 rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_C, 0x11);
223 rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_D, 0x2040);
224 rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_E, 0x60c0);
225 rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_F, 0x1020);
226 rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_G, 0x60c0);
227
228 rc |= jbt_reg_write16(jbt, JBT_REG_GAMMA1_FINE_1, 0x5533);
229 rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_FINE_2, 0x00);
230 rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_INCLINATION, 0x00);
231 rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_BLUE_OFFSET, 0x00);
232
233 if (jbt->resolution != JBT_RESOLUTION_QVGA) {
234 rc |= jbt_reg_write16(jbt, JBT_REG_HCLOCK_VGA, 0x1f0);
235 rc |= jbt_reg_write(jbt, JBT_REG_BLANK_CONTROL, 0x02);
236 rc |= jbt_reg_write16(jbt, JBT_REG_BLANK_TH_TV, 0x0804);
237
238 rc |= jbt_reg_write(jbt, JBT_REG_CKV_ON_OFF, 0x01);
239 rc |= jbt_reg_write16(jbt, JBT_REG_CKV_1_2, 0x0000);
240
241 rc |= jbt_reg_write16(jbt, JBT_REG_OEV_TIMING, 0x0d0e);
242 rc |= jbt_reg_write16(jbt, JBT_REG_ASW_TIMING_1, 0x11a4);
243 rc |= jbt_reg_write(jbt, JBT_REG_ASW_TIMING_2, 0x0e);
244 } else {
245 rc |= jbt_reg_write16(jbt, JBT_REG_HCLOCK_QVGA, 0x00ff);
246 rc |= jbt_reg_write(jbt, JBT_REG_BLANK_CONTROL_QVGA, 0x02);
247 rc |= jbt_reg_write16(jbt, JBT_REG_BLANK_TH_TV_QVGA, 0x0804);
248
249 rc |= jbt_reg_write(jbt, JBT_REG_CKV_ON_OFF_QVGA, 0x01);
250 rc |= jbt_reg_write16(jbt, JBT_REG_CKV_1_2_QVGA, 0x0008);
251
252 rc |= jbt_reg_write16(jbt, JBT_REG_OEV_TIMING_QVGA, 0x050a);
253 rc |= jbt_reg_write16(jbt, JBT_REG_ASW_TIMING_1_QVGA, 0x0a19);
254 rc |= jbt_reg_write(jbt, JBT_REG_ASW_TIMING_2_QVGA, 0x0a);
255 }
256
257 return rc ? -EIO : 0;
258 }
259
260 static int standby_to_sleep(struct jbt_info *jbt)
261 {
262 int rc;
263
264 /* three times command zero */
265 rc = jbt_reg_write_nodata(jbt, 0x00);
266 mdelay(1);
267 rc |= jbt_reg_write_nodata(jbt, 0x00);
268 mdelay(1);
269 rc |= jbt_reg_write_nodata(jbt, 0x00);
270 mdelay(1);
271
272 /* deep standby out */
273 rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x11);
274 mdelay(1);
275 rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x28);
276
277 /* (re)initialize register set */
278 rc |= jbt_init_regs(jbt);
279
280 return rc ? -EIO : 0;
281 }
282
283 static int sleep_to_normal(struct jbt_info *jbt)
284 {
285 int rc;
286
287 /* Make sure we are 120 ms after SLEEP_OUT */
288 if (time_before(jiffies, jbt->last_sleep))
289 mdelay(jiffies_to_msecs(jbt->last_sleep - jiffies));
290
291 if (jbt->resolution == JBT_RESOLUTION_VGA) {
292 /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */
293 rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x80);
294
295 /* Quad mode off */
296 rc |= jbt_reg_write(jbt, JBT_REG_QUAD_RATE, 0x00);
297 } else {
298 /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */
299 rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x81);
300
301 /* Quad mode on */
302 rc |= jbt_reg_write(jbt, JBT_REG_QUAD_RATE, 0x22);
303 }
304
305 /* AVDD on, XVDD on */
306 rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x16);
307
308 /* Output control */
309 rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0xfff9);
310
311 /* Turn on display */
312 rc |= jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_ON);
313
314 /* Sleep mode off */
315 rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_OUT);
316 jbt->last_sleep = jiffies + msecs_to_jiffies(120);
317
318 /* Allow the booster and display controller to restart stably */
319 mdelay(5);
320
321 return rc ? -EIO : 0;
322 }
323
324 static int normal_to_sleep(struct jbt_info *jbt)
325 {
326 int rc;
327
328 /* Make sure we are 120 ms after SLEEP_OUT */
329 while (time_before(jiffies, jbt->last_sleep))
330 cpu_relax();
331
332 rc = jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF);
333 rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0x8000 | 1 << 3);
334 rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_IN);
335 jbt->last_sleep = jiffies + msecs_to_jiffies(120);
336
337 /* Allow the internal circuits to stop automatically */
338 mdelay(5);
339
340 return rc ? -EIO : 0;
341 }
342
343 static int sleep_to_standby(struct jbt_info *jbt)
344 {
345 return jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x00);
346 }
347
348 int jbt6k74_enter_power_mode(struct jbt_info *jbt, enum jbt_power_mode new_mode)
349 {
350 struct jbt6k74_platform_data *pdata = jbt->spi_dev->dev.platform_data;
351 int rc = -EINVAL;
352
353 dev_dbg(&jbt->spi_dev->dev, "entering (old_state=%s, new_state=%s)\n",
354 jbt_power_mode_names[jbt->power_mode],
355 jbt_power_mode_names[new_mode]);
356
357 mutex_lock(&jbt->lock);
358
359 if (jbt->suspended) {
360 switch (new_mode) {
361 case JBT_POWER_MODE_DEEP_STANDBY:
362 case JBT_POWER_MODE_SLEEP:
363 case JBT_POWER_MODE_NORMAL:
364 rc = 0;
365 jbt->suspend_mode = new_mode;
366 break;
367 default:
368 break;
369 }
370 } else if (new_mode == JBT_POWER_MODE_NORMAL &&
371 pdata->enable_pixel_clock) {
372 pdata->enable_pixel_clock(&jbt->spi_dev->dev, 1);
373 }
374
375 switch (jbt->power_mode) {
376 case JBT_POWER_MODE_DEEP_STANDBY:
377 switch (new_mode) {
378 case JBT_POWER_MODE_DEEP_STANDBY:
379 rc = 0;
380 break;
381 case JBT_POWER_MODE_SLEEP:
382 rc = standby_to_sleep(jbt);
383 break;
384 case JBT_POWER_MODE_NORMAL:
385 /* first transition into sleep */
386 rc = standby_to_sleep(jbt);
387 /* then transition into normal */
388 rc |= sleep_to_normal(jbt);
389 break;
390 }
391 break;
392 case JBT_POWER_MODE_SLEEP:
393 switch (new_mode) {
394 case JBT_POWER_MODE_SLEEP:
395 rc = 0;
396 break;
397 case JBT_POWER_MODE_DEEP_STANDBY:
398 rc = sleep_to_standby(jbt);
399 break;
400 case JBT_POWER_MODE_NORMAL:
401 rc = sleep_to_normal(jbt);
402 break;
403 }
404 break;
405 case JBT_POWER_MODE_NORMAL:
406 switch (new_mode) {
407 case JBT_POWER_MODE_NORMAL:
408 rc = 0;
409 break;
410 case JBT_POWER_MODE_DEEP_STANDBY:
411 /* first transition into sleep */
412 rc = normal_to_sleep(jbt);
413 /* then transition into deep standby */
414 rc |= sleep_to_standby(jbt);
415 break;
416 case JBT_POWER_MODE_SLEEP:
417 rc = normal_to_sleep(jbt);
418 break;
419 }
420 }
421
422 if (rc == 0) {
423 jbt->power_mode = new_mode;
424 if (new_mode != JBT_POWER_MODE_NORMAL &&
425 pdata->enable_pixel_clock)
426 pdata->enable_pixel_clock(&jbt->spi_dev->dev, 0);
427 } else {
428 dev_err(&jbt->spi_dev->dev, "Failed enter state '%s')\n",
429 jbt_power_mode_names[new_mode]);
430 }
431
432 mutex_unlock(&jbt->lock);
433
434 return rc;
435 }
436 EXPORT_SYMBOL_GPL(jbt6k74_enter_power_mode);
437
438 int jbt6k74_set_resolution(struct jbt_info *jbt, enum jbt_resolution new_resolution) {
439 int rc = 0;
440 enum jbt_resolution old_resolution;
441
442 if (new_resolution != JBT_RESOLUTION_VGA &&
443 new_resolution != JBT_RESOLUTION_QVGA)
444 return -EINVAL;
445
446 mutex_lock(&jbt->lock);
447
448 if (jbt->resolution == new_resolution)
449 goto out_unlock;
450
451 old_resolution = jbt->resolution;
452 jbt->resolution = new_resolution;
453
454 if (jbt->power_mode == JBT_POWER_MODE_NORMAL) {
455
456 /* first transition into sleep */
457 rc = normal_to_sleep(jbt);
458 /* second transition into deep standby */
459 /* rc |= sleep_to_standby(jbt);*/
460 /* third transition into sleep */
461 /* rc |= standby_to_sleep(jbt);*/
462 /* fourth transition into normal */
463 rc |= sleep_to_normal(jbt);
464
465 if (rc) {
466 jbt->resolution = old_resolution;
467 dev_err(&jbt->spi_dev->dev, "Failed to set resolution '%s')\n",
468 jbt_resolution_names[new_resolution]);
469 }
470 }
471
472 out_unlock:
473 mutex_unlock(&jbt->lock);
474
475 return rc;
476 }
477 EXPORT_SYMBOL_GPL(jbt6k74_set_resolution);
478
479 static ssize_t resolution_read(struct device *dev, struct device_attribute *attr,
480 char *buf)
481 {
482 struct jbt_info *jbt = dev_get_drvdata(dev);
483
484 if (jbt->resolution >= ARRAY_SIZE(jbt_resolution_names))
485 return -EIO;
486
487 return sprintf(buf, "%s\n", jbt_resolution_names[jbt->resolution]);
488 }
489
490 static ssize_t resolution_write(struct device *dev, struct device_attribute *attr,
491 const char *buf, size_t count)
492 {
493 struct jbt_info *jbt = dev_get_drvdata(dev);
494 int i, rc;
495
496 for (i = 0; i < ARRAY_SIZE(jbt_resolution_names); i++) {
497 if (!strncmp(buf, jbt_resolution_names[i],
498 strlen(jbt_resolution_names[i]))) {
499 rc = jbt6k74_set_resolution(jbt, i);
500 if (rc)
501 return rc;
502 return count;
503 }
504 }
505
506 return -EINVAL;
507 }
508
509 static DEVICE_ATTR(resolution, 0644, resolution_read, resolution_write);
510
511 static int reg_by_string(const char *name)
512 {
513 if (!strcmp(name, "gamma_fine1"))
514 return JBT_REG_GAMMA1_FINE_1;
515 else if (!strcmp(name, "gamma_fine2"))
516 return JBT_REG_GAMMA1_FINE_2;
517 else if (!strcmp(name, "gamma_inclination"))
518 return JBT_REG_GAMMA1_INCLINATION;
519 else
520 return JBT_REG_GAMMA1_BLUE_OFFSET;
521 }
522
523 static ssize_t gamma_read(struct device *dev, struct device_attribute *attr,
524 char *buf)
525 {
526 struct jbt_info *jbt = dev_get_drvdata(dev);
527 int reg = reg_by_string(attr->attr.name);
528 u16 val;
529
530 mutex_lock(&jbt->lock);
531 val = jbt->reg_cache[reg];
532 mutex_unlock(&jbt->lock);
533
534 return sprintf(buf, "0x%04x\n", val);
535 }
536
537 static ssize_t gamma_write(struct device *dev, struct device_attribute *attr,
538 const char *buf, size_t count)
539 {
540 struct jbt_info *jbt = dev_get_drvdata(dev);
541 int reg = reg_by_string(attr->attr.name);
542 unsigned long val = simple_strtoul(buf, NULL, 10);
543
544 dev_info(dev, "writing gama %lu\n", val & 0xff);
545
546 mutex_lock(&jbt->lock);
547 jbt_reg_write(jbt, reg, val & 0xff);
548 mutex_unlock(&jbt->lock);
549
550 return count;
551 }
552
553 static ssize_t reset_write(struct device *dev, struct device_attribute *attr,
554 const char *buf, size_t count)
555 {
556 int rc;
557 struct jbt_info *jbt = dev_get_drvdata(dev);
558 struct jbt6k74_platform_data *pdata = jbt->spi_dev->dev.platform_data;
559
560 dev_info(dev, "reset\n");
561
562 mutex_lock(&jbt->lock);
563
564 /* hard reset the jbt6k74 */
565 (pdata->reset)(0, 0);
566 mdelay(1);
567 (pdata->reset)(0, 1);
568 mdelay(120);
569
570 rc = jbt_reg_write_nodata(jbt, 0x01);
571 if (rc < 0)
572 dev_err(&jbt->spi_dev->dev, "cannot soft reset\n");
573 mdelay(120);
574
575 mutex_unlock(&jbt->lock);
576
577 jbt6k74_enter_power_mode(jbt, jbt->power_mode);
578
579 return count;
580 }
581
582 static DEVICE_ATTR(gamma_fine1, 0644, gamma_read, gamma_write);
583 static DEVICE_ATTR(gamma_fine2, 0644, gamma_read, gamma_write);
584 static DEVICE_ATTR(gamma_inclination, 0644, gamma_read, gamma_write);
585 static DEVICE_ATTR(gamma_blue_offset, 0644, gamma_read, gamma_write);
586 static DEVICE_ATTR(reset, 0600, NULL, reset_write);
587
588 static struct attribute *jbt_sysfs_entries[] = {
589 &dev_attr_resolution.attr,
590 &dev_attr_gamma_fine1.attr,
591 &dev_attr_gamma_fine2.attr,
592 &dev_attr_gamma_inclination.attr,
593 &dev_attr_gamma_blue_offset.attr,
594 &dev_attr_reset.attr,
595 NULL,
596 };
597
598 static struct attribute_group jbt_attr_group = {
599 .name = NULL,
600 .attrs = jbt_sysfs_entries,
601 };
602
603 /* FIXME: This in an ugly hack to delay display blanking.
604 When the jbt is in sleep mode it displays an all white screen and thus one
605 will a see a short flash.
606 By delaying the blanking we will give the backlight a chance to turn off and
607 thus avoid getting the flash */
608 static void jbt_blank_worker(struct work_struct *work) {
609 struct jbt_info *jbt = container_of(work, struct jbt_info,
610 blank_work.work);
611
612 switch (jbt->blank_mode) {
613 case FB_BLANK_NORMAL:
614 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_SLEEP);
615 break;
616 case FB_BLANK_POWERDOWN:
617 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
618 break;
619 default:
620 break;
621 }
622 }
623
624 static int jbt6k74_set_mode(struct lcd_device *ld, struct fb_videomode *m) {
625 int rc = -EINVAL;
626 struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
627
628 if (m->xres == 240 && m->yres == 320) {
629 rc = jbt6k74_set_resolution(jbt, JBT_RESOLUTION_QVGA);
630 } else if (m->xres == 480 && m->yres == 640) {
631 rc = jbt6k74_set_resolution(jbt, JBT_RESOLUTION_VGA);
632 } else {
633 dev_err(&jbt->spi_dev->dev, "Unknown resolution. Entering sleep mode.\n");
634 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_SLEEP);
635 }
636
637 return rc;
638 }
639
640 static int jbt6k74_set_power(struct lcd_device *ld, int power) {
641 int rc = -EINVAL;
642 struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
643
644 jbt->blank_mode = power;
645 cancel_rearming_delayed_work(&jbt->blank_work);
646
647 switch (power) {
648 case FB_BLANK_UNBLANK:
649 dev_dbg(&jbt->spi_dev->dev, "unblank\n");
650 rc = jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
651 break;
652 case FB_BLANK_NORMAL:
653 dev_dbg(&jbt->spi_dev->dev, "blank\n");
654 rc = schedule_delayed_work(&jbt->blank_work, HZ);
655 break;
656 case FB_BLANK_POWERDOWN:
657 dev_dbg(&jbt->spi_dev->dev, "powerdown\n");
658 rc = schedule_delayed_work(&jbt->blank_work, HZ);
659 break;
660 default:
661 break;
662 }
663
664 return rc;
665 }
666
667 static int jbt6k74_get_power(struct lcd_device *ld) {
668 struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
669
670 switch (jbt->power_mode) {
671 case JBT_POWER_MODE_NORMAL:
672 return FB_BLANK_UNBLANK;
673 case JBT_POWER_MODE_SLEEP:
674 return FB_BLANK_NORMAL;
675 default:
676 return JBT_POWER_MODE_DEEP_STANDBY;
677 }
678 }
679
680 struct lcd_ops jbt6k74_lcd_ops = {
681 .set_power = jbt6k74_set_power,
682 .get_power = jbt6k74_get_power,
683 .set_mode = jbt6k74_set_mode,
684 };
685
686 /* linux device model infrastructure */
687
688 static int __devinit jbt_probe(struct spi_device *spi)
689 {
690 int rc;
691 struct jbt_info *jbt;
692 struct jbt6k74_platform_data *pdata = spi->dev.platform_data;
693
694 /* the controller doesn't have a MISO pin; we can't do detection */
695
696 spi->mode = SPI_CPOL | SPI_CPHA;
697 spi->bits_per_word = 9;
698
699 rc = spi_setup(spi);
700 if (rc < 0) {
701 dev_err(&spi->dev,
702 "error during spi_setup of jbt6k74 driver\n");
703 return rc;
704 }
705
706 jbt = kzalloc(sizeof(*jbt), GFP_KERNEL);
707 if (!jbt)
708 return -ENOMEM;
709
710 jbt->spi_dev = spi;
711
712 jbt->lcd_dev = lcd_device_register("jbt6k74-lcd", &spi->dev,
713 jbt, &jbt6k74_lcd_ops);
714
715 if (IS_ERR(jbt->lcd_dev)) {
716 rc = PTR_ERR(jbt->lcd_dev);
717 goto err_free_drvdata;
718 }
719
720 INIT_DELAYED_WORK(&jbt->blank_work, jbt_blank_worker);
721
722 jbt->resolution = JBT_RESOLUTION_VGA;
723 jbt->power_mode = JBT_POWER_MODE_DEEP_STANDBY;
724 jbt->last_sleep = jiffies + msecs_to_jiffies(120);
725 mutex_init(&jbt->lock);
726
727 dev_set_drvdata(&spi->dev, jbt);
728
729 rc = jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
730 if (rc < 0) {
731 dev_err(&spi->dev, "cannot enter NORMAL state\n");
732 goto err_unregister_lcd;
733 }
734
735 rc = sysfs_create_group(&spi->dev.kobj, &jbt_attr_group);
736 if (rc < 0) {
737 dev_err(&spi->dev, "cannot create sysfs group\n");
738 goto err_standby;
739 }
740
741 if (pdata->probe_completed)
742 (pdata->probe_completed)(&spi->dev);
743
744 return 0;
745
746 err_standby:
747 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
748 err_unregister_lcd:
749 lcd_device_unregister(jbt->lcd_dev);
750 err_free_drvdata:
751 dev_set_drvdata(&spi->dev, NULL);
752 kfree(jbt);
753
754 return rc;
755 }
756
757 static int __devexit jbt_remove(struct spi_device *spi)
758 {
759 struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
760
761 /* We don't want to switch off the display in case the user
762 * accidentially unloads the module (whose use count normally is 0) */
763 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
764
765 sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group);
766 dev_set_drvdata(&spi->dev, NULL);
767
768 lcd_device_unregister(jbt->lcd_dev);
769
770 kfree(jbt);
771
772 return 0;
773 }
774
775 #ifdef CONFIG_PM
776 static int jbt_suspend(struct spi_device *spi, pm_message_t state)
777 {
778 struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
779
780 jbt->suspend_mode = jbt->power_mode;
781
782 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
783 jbt->suspended = 1;
784
785 dev_info(&spi->dev, "suspended\n");
786
787 return 0;
788 }
789
790 int jbt6k74_resume(struct spi_device *spi)
791 {
792 struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
793
794 jbt->suspended = 0;
795 jbt6k74_enter_power_mode(jbt, jbt->suspend_mode);
796
797 dev_info(&spi->dev, "resumed\n");
798
799 return 0;
800 }
801 EXPORT_SYMBOL_GPL(jbt6k74_resume);
802
803 #else
804 #define jbt_suspend NULL
805 #define jbt6k74_resume NULL
806 #endif
807
808 static struct spi_driver jbt6k74_driver = {
809 .driver = {
810 .name = "jbt6k74",
811 .owner = THIS_MODULE,
812 },
813
814 .probe = jbt_probe,
815 .remove = __devexit_p(jbt_remove),
816 .suspend = jbt_suspend,
817 .resume = jbt6k74_resume,
818 };
819
820 static int __init jbt_init(void)
821 {
822 return spi_register_driver(&jbt6k74_driver);
823 }
824
825 static void __exit jbt_exit(void)
826 {
827 spi_unregister_driver(&jbt6k74_driver);
828 }
829
830 MODULE_DESCRIPTION("SPI driver for tpo JBT6K74-AS LCM control interface");
831 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
832 MODULE_LICENSE("GPL");
833
834 module_init(jbt_init);
835 module_exit(jbt_exit);