This source file includes following definitions.
- lcdtg_ssp_i2c_send
- lcdtg_i2c_send_bit
- lcdtg_i2c_send_start
- lcdtg_i2c_send_stop
- lcdtg_i2c_send_byte
- lcdtg_i2c_wait_ack
- lcdtg_set_common_voltage
- corgi_ssp_lcdtg_send
- lcdtg_set_phadadj
- corgi_lcd_power_on
- corgi_lcd_power_off
- corgi_lcd_set_mode
- corgi_lcd_set_power
- corgi_lcd_get_power
- corgi_bl_get_intensity
- corgi_bl_set_intensity
- corgi_bl_update_status
- corgi_lcd_limit_intensity
- corgi_lcd_suspend
- corgi_lcd_resume
- setup_gpio_backlight
- corgi_lcd_probe
- corgi_lcd_remove
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14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/gpio.h>
19 #include <linux/fb.h>
20 #include <linux/lcd.h>
21 #include <linux/spi/spi.h>
22 #include <linux/spi/corgi_lcd.h>
23 #include <linux/slab.h>
24 #include <asm/mach/sharpsl_param.h>
25
26 #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
27
28
29 #define RESCTL_ADRS 0x00
30 #define PHACTRL_ADRS 0x01
31 #define DUTYCTRL_ADRS 0x02
32 #define POWERREG0_ADRS 0x03
33 #define POWERREG1_ADRS 0x04
34 #define GPOR3_ADRS 0x05
35 #define PICTRL_ADRS 0x06
36 #define POLCTRL_ADRS 0x07
37
38
39 #define RESCTL_QVGA 0x01
40 #define RESCTL_VGA 0x00
41
42 #define POWER1_VW_ON 0x01
43 #define POWER1_GVSS_ON 0x02
44 #define POWER1_VDD_ON 0x04
45
46 #define POWER1_VW_OFF 0x00
47 #define POWER1_GVSS_OFF 0x00
48 #define POWER1_VDD_OFF 0x00
49
50 #define POWER0_COM_DCLK 0x01
51 #define POWER0_COM_DOUT 0x02
52 #define POWER0_DAC_ON 0x04
53 #define POWER0_COM_ON 0x08
54 #define POWER0_VCC5_ON 0x10
55
56 #define POWER0_DAC_OFF 0x00
57 #define POWER0_COM_OFF 0x00
58 #define POWER0_VCC5_OFF 0x00
59
60 #define PICTRL_INIT_STATE 0x01
61 #define PICTRL_INIOFF 0x02
62 #define PICTRL_POWER_DOWN 0x04
63 #define PICTRL_COM_SIGNAL_OFF 0x08
64 #define PICTRL_DAC_SIGNAL_OFF 0x10
65
66 #define POLCTRL_SYNC_POL_FALL 0x01
67 #define POLCTRL_EN_POL_FALL 0x02
68 #define POLCTRL_DATA_POL_FALL 0x04
69 #define POLCTRL_SYNC_ACT_H 0x08
70 #define POLCTRL_EN_ACT_L 0x10
71
72 #define POLCTRL_SYNC_POL_RISE 0x00
73 #define POLCTRL_EN_POL_RISE 0x00
74 #define POLCTRL_DATA_POL_RISE 0x00
75 #define POLCTRL_SYNC_ACT_L 0x00
76 #define POLCTRL_EN_ACT_H 0x00
77
78 #define PHACTRL_PHASE_MANUAL 0x01
79 #define DEFAULT_PHAD_QVGA (9)
80 #define DEFAULT_COMADJ (125)
81
82 struct corgi_lcd {
83 struct spi_device *spi_dev;
84 struct lcd_device *lcd_dev;
85 struct backlight_device *bl_dev;
86
87 int limit_mask;
88 int intensity;
89 int power;
90 int mode;
91 char buf[2];
92
93 int gpio_backlight_on;
94 int gpio_backlight_cont;
95 int gpio_backlight_cont_inverted;
96
97 void (*kick_battery)(void);
98 };
99
100 static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val);
101
102 static struct corgi_lcd *the_corgi_lcd;
103 static unsigned long corgibl_flags;
104 #define CORGIBL_SUSPENDED 0x01
105 #define CORGIBL_BATTLOW 0x02
106
107
108
109
110
111 static void lcdtg_ssp_i2c_send(struct corgi_lcd *lcd, uint8_t data)
112 {
113 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, data);
114 udelay(10);
115 }
116
117 static void lcdtg_i2c_send_bit(struct corgi_lcd *lcd, uint8_t data)
118 {
119 lcdtg_ssp_i2c_send(lcd, data);
120 lcdtg_ssp_i2c_send(lcd, data | POWER0_COM_DCLK);
121 lcdtg_ssp_i2c_send(lcd, data);
122 }
123
124 static void lcdtg_i2c_send_start(struct corgi_lcd *lcd, uint8_t base)
125 {
126 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
127 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
128 lcdtg_ssp_i2c_send(lcd, base);
129 }
130
131 static void lcdtg_i2c_send_stop(struct corgi_lcd *lcd, uint8_t base)
132 {
133 lcdtg_ssp_i2c_send(lcd, base);
134 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
135 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
136 }
137
138 static void lcdtg_i2c_send_byte(struct corgi_lcd *lcd,
139 uint8_t base, uint8_t data)
140 {
141 int i;
142
143 for (i = 0; i < 8; i++) {
144 if (data & 0x80)
145 lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT);
146 else
147 lcdtg_i2c_send_bit(lcd, base);
148 data <<= 1;
149 }
150 }
151
152 static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base)
153 {
154 lcdtg_i2c_send_bit(lcd, base);
155 }
156
157 static void lcdtg_set_common_voltage(struct corgi_lcd *lcd,
158 uint8_t base_data, uint8_t data)
159 {
160
161 lcdtg_i2c_send_start(lcd, base_data);
162 lcdtg_i2c_send_byte(lcd, base_data, 0x9c);
163 lcdtg_i2c_wait_ack(lcd, base_data);
164 lcdtg_i2c_send_byte(lcd, base_data, 0x00);
165 lcdtg_i2c_wait_ack(lcd, base_data);
166 lcdtg_i2c_send_byte(lcd, base_data, data);
167 lcdtg_i2c_wait_ack(lcd, base_data);
168 lcdtg_i2c_send_stop(lcd, base_data);
169 }
170
171 static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data)
172 {
173 struct spi_message msg;
174 struct spi_transfer xfer = {
175 .len = 1,
176 .cs_change = 0,
177 .tx_buf = lcd->buf,
178 };
179
180 lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
181 spi_message_init(&msg);
182 spi_message_add_tail(&xfer, &msg);
183
184 return spi_sync(lcd->spi_dev, &msg);
185 }
186
187
188 static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode)
189 {
190 int adj;
191
192 switch (mode) {
193 case CORGI_LCD_MODE_VGA:
194
195 adj = sharpsl_param.phadadj;
196 adj = (adj < 0) ? PHACTRL_PHASE_MANUAL :
197 PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1);
198 break;
199 case CORGI_LCD_MODE_QVGA:
200 default:
201
202 adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL;
203 break;
204 }
205
206 corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj);
207 }
208
209 static void corgi_lcd_power_on(struct corgi_lcd *lcd)
210 {
211 int comadj;
212
213
214 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
215 PICTRL_POWER_DOWN | PICTRL_INIOFF |
216 PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF |
217 PICTRL_DAC_SIGNAL_OFF);
218
219 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
220 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF |
221 POWER0_COM_OFF | POWER0_VCC5_OFF);
222
223 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
224 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
225
226
227 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
228 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
229 mdelay(3);
230
231
232 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
233 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
234 POWER0_COM_OFF | POWER0_VCC5_OFF);
235
236
237
238 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
239 PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF);
240
241
242 comadj = sharpsl_param.comadj;
243 if (comadj < 0)
244 comadj = DEFAULT_COMADJ;
245
246 lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
247 POWER0_VCC5_OFF, comadj);
248
249
250 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
251 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
252 POWER0_COM_OFF | POWER0_VCC5_ON);
253
254
255 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
256 POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
257 mdelay(2);
258
259
260 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE);
261
262
263 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
264 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
265 POWER0_COM_ON | POWER0_VCC5_ON);
266
267
268 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
269 POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON);
270
271
272 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0);
273
274
275 lcdtg_set_phadadj(lcd, lcd->mode);
276
277
278 corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS,
279 POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE |
280 POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L |
281 POLCTRL_EN_ACT_H);
282 udelay(1000);
283
284 switch (lcd->mode) {
285 case CORGI_LCD_MODE_VGA:
286 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
287 break;
288 case CORGI_LCD_MODE_QVGA:
289 default:
290 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
291 break;
292 }
293 }
294
295 static void corgi_lcd_power_off(struct corgi_lcd *lcd)
296 {
297
298 msleep(34);
299
300
301 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
302 POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
303
304
305 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF);
306 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
307 POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON);
308
309
310 lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
311 POWER0_VCC5_ON, 0);
312
313
314 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
315 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
316
317
318 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
319 POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF);
320
321
322 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
323 PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF |
324 PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF);
325
326
327 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
328 POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF);
329
330
331 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
332 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
333 }
334
335 static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m)
336 {
337 struct corgi_lcd *lcd = lcd_get_data(ld);
338 int mode = CORGI_LCD_MODE_QVGA;
339
340 if (m->xres == 640 || m->xres == 480)
341 mode = CORGI_LCD_MODE_VGA;
342
343 if (lcd->mode == mode)
344 return 0;
345
346 lcdtg_set_phadadj(lcd, mode);
347
348 switch (mode) {
349 case CORGI_LCD_MODE_VGA:
350 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
351 break;
352 case CORGI_LCD_MODE_QVGA:
353 default:
354 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
355 break;
356 }
357
358 lcd->mode = mode;
359 return 0;
360 }
361
362 static int corgi_lcd_set_power(struct lcd_device *ld, int power)
363 {
364 struct corgi_lcd *lcd = lcd_get_data(ld);
365
366 if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
367 corgi_lcd_power_on(lcd);
368
369 if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
370 corgi_lcd_power_off(lcd);
371
372 lcd->power = power;
373 return 0;
374 }
375
376 static int corgi_lcd_get_power(struct lcd_device *ld)
377 {
378 struct corgi_lcd *lcd = lcd_get_data(ld);
379
380 return lcd->power;
381 }
382
383 static struct lcd_ops corgi_lcd_ops = {
384 .get_power = corgi_lcd_get_power,
385 .set_power = corgi_lcd_set_power,
386 .set_mode = corgi_lcd_set_mode,
387 };
388
389 static int corgi_bl_get_intensity(struct backlight_device *bd)
390 {
391 struct corgi_lcd *lcd = bl_get_data(bd);
392
393 return lcd->intensity;
394 }
395
396 static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity)
397 {
398 int cont;
399
400 if (intensity > 0x10)
401 intensity += 0x10;
402
403 corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);
404
405
406 cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted;
407
408 if (gpio_is_valid(lcd->gpio_backlight_cont))
409 gpio_set_value_cansleep(lcd->gpio_backlight_cont, cont);
410
411 if (gpio_is_valid(lcd->gpio_backlight_on))
412 gpio_set_value_cansleep(lcd->gpio_backlight_on, intensity);
413
414 if (lcd->kick_battery)
415 lcd->kick_battery();
416
417 lcd->intensity = intensity;
418 return 0;
419 }
420
421 static int corgi_bl_update_status(struct backlight_device *bd)
422 {
423 struct corgi_lcd *lcd = bl_get_data(bd);
424 int intensity = bd->props.brightness;
425
426 if (bd->props.power != FB_BLANK_UNBLANK)
427 intensity = 0;
428
429 if (bd->props.fb_blank != FB_BLANK_UNBLANK)
430 intensity = 0;
431
432 if (corgibl_flags & CORGIBL_SUSPENDED)
433 intensity = 0;
434
435 if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask)
436 intensity = lcd->limit_mask;
437
438 return corgi_bl_set_intensity(lcd, intensity);
439 }
440
441 void corgi_lcd_limit_intensity(int limit)
442 {
443 if (limit)
444 corgibl_flags |= CORGIBL_BATTLOW;
445 else
446 corgibl_flags &= ~CORGIBL_BATTLOW;
447
448 backlight_update_status(the_corgi_lcd->bl_dev);
449 }
450 EXPORT_SYMBOL(corgi_lcd_limit_intensity);
451
452 static const struct backlight_ops corgi_bl_ops = {
453 .get_brightness = corgi_bl_get_intensity,
454 .update_status = corgi_bl_update_status,
455 };
456
457 #ifdef CONFIG_PM_SLEEP
458 static int corgi_lcd_suspend(struct device *dev)
459 {
460 struct corgi_lcd *lcd = dev_get_drvdata(dev);
461
462 corgibl_flags |= CORGIBL_SUSPENDED;
463 corgi_bl_set_intensity(lcd, 0);
464 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
465 return 0;
466 }
467
468 static int corgi_lcd_resume(struct device *dev)
469 {
470 struct corgi_lcd *lcd = dev_get_drvdata(dev);
471
472 corgibl_flags &= ~CORGIBL_SUSPENDED;
473 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
474 backlight_update_status(lcd->bl_dev);
475 return 0;
476 }
477 #endif
478
479 static SIMPLE_DEV_PM_OPS(corgi_lcd_pm_ops, corgi_lcd_suspend, corgi_lcd_resume);
480
481 static int setup_gpio_backlight(struct corgi_lcd *lcd,
482 struct corgi_lcd_platform_data *pdata)
483 {
484 struct spi_device *spi = lcd->spi_dev;
485 int err;
486
487 lcd->gpio_backlight_on = -1;
488 lcd->gpio_backlight_cont = -1;
489
490 if (gpio_is_valid(pdata->gpio_backlight_on)) {
491 err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_on,
492 "BL_ON");
493 if (err) {
494 dev_err(&spi->dev,
495 "failed to request GPIO%d for backlight_on\n",
496 pdata->gpio_backlight_on);
497 return err;
498 }
499
500 lcd->gpio_backlight_on = pdata->gpio_backlight_on;
501 gpio_direction_output(lcd->gpio_backlight_on, 0);
502 }
503
504 if (gpio_is_valid(pdata->gpio_backlight_cont)) {
505 err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_cont,
506 "BL_CONT");
507 if (err) {
508 dev_err(&spi->dev,
509 "failed to request GPIO%d for backlight_cont\n",
510 pdata->gpio_backlight_cont);
511 return err;
512 }
513
514 lcd->gpio_backlight_cont = pdata->gpio_backlight_cont;
515
516
517
518
519 if (gpio_is_valid(lcd->gpio_backlight_on)) {
520 lcd->gpio_backlight_cont_inverted = 1;
521 gpio_direction_output(lcd->gpio_backlight_cont, 1);
522 } else {
523 lcd->gpio_backlight_cont_inverted = 0;
524 gpio_direction_output(lcd->gpio_backlight_cont, 0);
525 }
526 }
527 return 0;
528 }
529
530 static int corgi_lcd_probe(struct spi_device *spi)
531 {
532 struct backlight_properties props;
533 struct corgi_lcd_platform_data *pdata = dev_get_platdata(&spi->dev);
534 struct corgi_lcd *lcd;
535 int ret = 0;
536
537 if (pdata == NULL) {
538 dev_err(&spi->dev, "platform data not available\n");
539 return -EINVAL;
540 }
541
542 lcd = devm_kzalloc(&spi->dev, sizeof(struct corgi_lcd), GFP_KERNEL);
543 if (!lcd)
544 return -ENOMEM;
545
546 lcd->spi_dev = spi;
547
548 lcd->lcd_dev = devm_lcd_device_register(&spi->dev, "corgi_lcd",
549 &spi->dev, lcd, &corgi_lcd_ops);
550 if (IS_ERR(lcd->lcd_dev))
551 return PTR_ERR(lcd->lcd_dev);
552
553 lcd->power = FB_BLANK_POWERDOWN;
554 lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;
555
556 memset(&props, 0, sizeof(struct backlight_properties));
557 props.type = BACKLIGHT_RAW;
558 props.max_brightness = pdata->max_intensity;
559 lcd->bl_dev = devm_backlight_device_register(&spi->dev, "corgi_bl",
560 &spi->dev, lcd, &corgi_bl_ops,
561 &props);
562 if (IS_ERR(lcd->bl_dev))
563 return PTR_ERR(lcd->bl_dev);
564
565 lcd->bl_dev->props.brightness = pdata->default_intensity;
566 lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
567
568 ret = setup_gpio_backlight(lcd, pdata);
569 if (ret)
570 return ret;
571
572 lcd->kick_battery = pdata->kick_battery;
573
574 spi_set_drvdata(spi, lcd);
575 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
576 backlight_update_status(lcd->bl_dev);
577
578 lcd->limit_mask = pdata->limit_mask;
579 the_corgi_lcd = lcd;
580 return 0;
581 }
582
583 static int corgi_lcd_remove(struct spi_device *spi)
584 {
585 struct corgi_lcd *lcd = spi_get_drvdata(spi);
586
587 lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
588 lcd->bl_dev->props.brightness = 0;
589 backlight_update_status(lcd->bl_dev);
590 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
591 return 0;
592 }
593
594 static struct spi_driver corgi_lcd_driver = {
595 .driver = {
596 .name = "corgi-lcd",
597 .pm = &corgi_lcd_pm_ops,
598 },
599 .probe = corgi_lcd_probe,
600 .remove = corgi_lcd_remove,
601 };
602
603 module_spi_driver(corgi_lcd_driver);
604
605 MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
606 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
607 MODULE_LICENSE("GPL");
608 MODULE_ALIAS("spi:corgi-lcd");