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18#include <linux/module.h>
19#include <linux/kernel.h>
20#include <linux/init.h>
21#include <linux/delay.h>
22#include <linux/gpio.h>
23#include <linux/fb.h>
24#include <linux/lcd.h>
25#include <linux/spi/spi.h>
26#include <linux/spi/corgi_lcd.h>
27#include <linux/slab.h>
28#include <asm/mach/sharpsl_param.h>
29
30#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
31
32
33#define RESCTL_ADRS 0x00
34#define PHACTRL_ADRS 0x01
35#define DUTYCTRL_ADRS 0x02
36#define POWERREG0_ADRS 0x03
37#define POWERREG1_ADRS 0x04
38#define GPOR3_ADRS 0x05
39#define PICTRL_ADRS 0x06
40#define POLCTRL_ADRS 0x07
41
42
43#define RESCTL_QVGA 0x01
44#define RESCTL_VGA 0x00
45
46#define POWER1_VW_ON 0x01
47#define POWER1_GVSS_ON 0x02
48#define POWER1_VDD_ON 0x04
49
50#define POWER1_VW_OFF 0x00
51#define POWER1_GVSS_OFF 0x00
52#define POWER1_VDD_OFF 0x00
53
54#define POWER0_COM_DCLK 0x01
55#define POWER0_COM_DOUT 0x02
56#define POWER0_DAC_ON 0x04
57#define POWER0_COM_ON 0x08
58#define POWER0_VCC5_ON 0x10
59
60#define POWER0_DAC_OFF 0x00
61#define POWER0_COM_OFF 0x00
62#define POWER0_VCC5_OFF 0x00
63
64#define PICTRL_INIT_STATE 0x01
65#define PICTRL_INIOFF 0x02
66#define PICTRL_POWER_DOWN 0x04
67#define PICTRL_COM_SIGNAL_OFF 0x08
68#define PICTRL_DAC_SIGNAL_OFF 0x10
69
70#define POLCTRL_SYNC_POL_FALL 0x01
71#define POLCTRL_EN_POL_FALL 0x02
72#define POLCTRL_DATA_POL_FALL 0x04
73#define POLCTRL_SYNC_ACT_H 0x08
74#define POLCTRL_EN_ACT_L 0x10
75
76#define POLCTRL_SYNC_POL_RISE 0x00
77#define POLCTRL_EN_POL_RISE 0x00
78#define POLCTRL_DATA_POL_RISE 0x00
79#define POLCTRL_SYNC_ACT_L 0x00
80#define POLCTRL_EN_ACT_H 0x00
81
82#define PHACTRL_PHASE_MANUAL 0x01
83#define DEFAULT_PHAD_QVGA (9)
84#define DEFAULT_COMADJ (125)
85
86struct corgi_lcd {
87 struct spi_device *spi_dev;
88 struct lcd_device *lcd_dev;
89 struct backlight_device *bl_dev;
90
91 int limit_mask;
92 int intensity;
93 int power;
94 int mode;
95 char buf[2];
96
97 int gpio_backlight_on;
98 int gpio_backlight_cont;
99 int gpio_backlight_cont_inverted;
100
101 void (*kick_battery)(void);
102};
103
104static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val);
105
106static struct corgi_lcd *the_corgi_lcd;
107static unsigned long corgibl_flags;
108#define CORGIBL_SUSPENDED 0x01
109#define CORGIBL_BATTLOW 0x02
110
111
112
113
114
115static void lcdtg_ssp_i2c_send(struct corgi_lcd *lcd, uint8_t data)
116{
117 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, data);
118 udelay(10);
119}
120
121static void lcdtg_i2c_send_bit(struct corgi_lcd *lcd, uint8_t data)
122{
123 lcdtg_ssp_i2c_send(lcd, data);
124 lcdtg_ssp_i2c_send(lcd, data | POWER0_COM_DCLK);
125 lcdtg_ssp_i2c_send(lcd, data);
126}
127
128static void lcdtg_i2c_send_start(struct corgi_lcd *lcd, uint8_t base)
129{
130 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
131 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
132 lcdtg_ssp_i2c_send(lcd, base);
133}
134
135static void lcdtg_i2c_send_stop(struct corgi_lcd *lcd, uint8_t base)
136{
137 lcdtg_ssp_i2c_send(lcd, base);
138 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
139 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
140}
141
142static void lcdtg_i2c_send_byte(struct corgi_lcd *lcd,
143 uint8_t base, uint8_t data)
144{
145 int i;
146 for (i = 0; i < 8; i++) {
147 if (data & 0x80)
148 lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT);
149 else
150 lcdtg_i2c_send_bit(lcd, base);
151 data <<= 1;
152 }
153}
154
155static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base)
156{
157 lcdtg_i2c_send_bit(lcd, base);
158}
159
160static void lcdtg_set_common_voltage(struct corgi_lcd *lcd,
161 uint8_t base_data, uint8_t data)
162{
163
164 lcdtg_i2c_send_start(lcd, base_data);
165 lcdtg_i2c_send_byte(lcd, base_data, 0x9c);
166 lcdtg_i2c_wait_ack(lcd, base_data);
167 lcdtg_i2c_send_byte(lcd, base_data, 0x00);
168 lcdtg_i2c_wait_ack(lcd, base_data);
169 lcdtg_i2c_send_byte(lcd, base_data, data);
170 lcdtg_i2c_wait_ack(lcd, base_data);
171 lcdtg_i2c_send_stop(lcd, base_data);
172}
173
174static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data)
175{
176 struct spi_message msg;
177 struct spi_transfer xfer = {
178 .len = 1,
179 .cs_change = 1,
180 .tx_buf = lcd->buf,
181 };
182
183 lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
184 spi_message_init(&msg);
185 spi_message_add_tail(&xfer, &msg);
186
187 return spi_sync(lcd->spi_dev, &msg);
188}
189
190
191static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode)
192{
193 int adj;
194
195 switch (mode) {
196 case CORGI_LCD_MODE_VGA:
197
198 adj = sharpsl_param.phadadj;
199 adj = (adj < 0) ? PHACTRL_PHASE_MANUAL :
200 PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1);
201 break;
202 case CORGI_LCD_MODE_QVGA:
203 default:
204
205 adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL;
206 break;
207 }
208
209 corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj);
210}
211
212static void corgi_lcd_power_on(struct corgi_lcd *lcd)
213{
214 int comadj;
215
216
217 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
218 PICTRL_POWER_DOWN | PICTRL_INIOFF |
219 PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF |
220 PICTRL_DAC_SIGNAL_OFF);
221
222 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
223 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF |
224 POWER0_COM_OFF | POWER0_VCC5_OFF);
225
226 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
227 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
228
229
230 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
231 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
232 mdelay(3);
233
234
235 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
236 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
237 POWER0_COM_OFF | POWER0_VCC5_OFF);
238
239
240
241 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
242 PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF);
243
244
245 comadj = sharpsl_param.comadj;
246 if (comadj < 0)
247 comadj = DEFAULT_COMADJ;
248
249 lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
250 POWER0_VCC5_OFF, comadj);
251
252
253 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
254 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
255 POWER0_COM_OFF | POWER0_VCC5_ON);
256
257
258 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
259 POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
260 mdelay(2);
261
262
263 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE);
264
265
266 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
267 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
268 POWER0_COM_ON | POWER0_VCC5_ON);
269
270
271 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
272 POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON);
273
274
275 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0);
276
277
278 lcdtg_set_phadadj(lcd, lcd->mode);
279
280
281 corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS,
282 POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE |
283 POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L |
284 POLCTRL_EN_ACT_H);
285 udelay(1000);
286
287 switch (lcd->mode) {
288 case CORGI_LCD_MODE_VGA:
289 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
290 break;
291 case CORGI_LCD_MODE_QVGA:
292 default:
293 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
294 break;
295 }
296}
297
298static void corgi_lcd_power_off(struct corgi_lcd *lcd)
299{
300
301 msleep(34);
302
303
304 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
305 POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
306
307
308 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF);
309 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
310 POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON);
311
312
313 lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
314 POWER0_VCC5_ON, 0);
315
316
317 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
318 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
319
320
321 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
322 POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF);
323
324
325 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
326 PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF |
327 PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF);
328
329
330 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
331 POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF);
332
333
334 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
335 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
336}
337
338static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m)
339{
340 struct corgi_lcd *lcd = lcd_get_data(ld);
341 int mode = CORGI_LCD_MODE_QVGA;
342
343 if (m->xres == 640 || m->xres == 480)
344 mode = CORGI_LCD_MODE_VGA;
345
346 if (lcd->mode == mode)
347 return 0;
348
349 lcdtg_set_phadadj(lcd, mode);
350
351 switch (mode) {
352 case CORGI_LCD_MODE_VGA:
353 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
354 break;
355 case CORGI_LCD_MODE_QVGA:
356 default:
357 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
358 break;
359 }
360
361 lcd->mode = mode;
362 return 0;
363}
364
365static int corgi_lcd_set_power(struct lcd_device *ld, int power)
366{
367 struct corgi_lcd *lcd = lcd_get_data(ld);
368
369 if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
370 corgi_lcd_power_on(lcd);
371
372 if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
373 corgi_lcd_power_off(lcd);
374
375 lcd->power = power;
376 return 0;
377}
378
379static int corgi_lcd_get_power(struct lcd_device *ld)
380{
381 struct corgi_lcd *lcd = lcd_get_data(ld);
382
383 return lcd->power;
384}
385
386static struct lcd_ops corgi_lcd_ops = {
387 .get_power = corgi_lcd_get_power,
388 .set_power = corgi_lcd_set_power,
389 .set_mode = corgi_lcd_set_mode,
390};
391
392static int corgi_bl_get_intensity(struct backlight_device *bd)
393{
394 struct corgi_lcd *lcd = bl_get_data(bd);
395
396 return lcd->intensity;
397}
398
399static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity)
400{
401 int cont;
402
403 if (intensity > 0x10)
404 intensity += 0x10;
405
406 corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);
407
408
409 cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted;
410
411 if (gpio_is_valid(lcd->gpio_backlight_cont))
412 gpio_set_value_cansleep(lcd->gpio_backlight_cont, cont);
413
414 if (gpio_is_valid(lcd->gpio_backlight_on))
415 gpio_set_value_cansleep(lcd->gpio_backlight_on, intensity);
416
417 if (lcd->kick_battery)
418 lcd->kick_battery();
419
420 lcd->intensity = intensity;
421 return 0;
422}
423
424static int corgi_bl_update_status(struct backlight_device *bd)
425{
426 struct corgi_lcd *lcd = bl_get_data(bd);
427 int intensity = bd->props.brightness;
428
429 if (bd->props.power != FB_BLANK_UNBLANK)
430 intensity = 0;
431
432 if (bd->props.fb_blank != FB_BLANK_UNBLANK)
433 intensity = 0;
434
435 if (corgibl_flags & CORGIBL_SUSPENDED)
436 intensity = 0;
437
438 if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask)
439 intensity = lcd->limit_mask;
440
441 return corgi_bl_set_intensity(lcd, intensity);
442}
443
444void corgi_lcd_limit_intensity(int limit)
445{
446 if (limit)
447 corgibl_flags |= CORGIBL_BATTLOW;
448 else
449 corgibl_flags &= ~CORGIBL_BATTLOW;
450
451 backlight_update_status(the_corgi_lcd->bl_dev);
452}
453EXPORT_SYMBOL(corgi_lcd_limit_intensity);
454
455static const struct backlight_ops corgi_bl_ops = {
456 .get_brightness = corgi_bl_get_intensity,
457 .update_status = corgi_bl_update_status,
458};
459
460#ifdef CONFIG_PM
461static int corgi_lcd_suspend(struct spi_device *spi, pm_message_t state)
462{
463 struct corgi_lcd *lcd = spi_get_drvdata(spi);
464
465 corgibl_flags |= CORGIBL_SUSPENDED;
466 corgi_bl_set_intensity(lcd, 0);
467 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
468 return 0;
469}
470
471static int corgi_lcd_resume(struct spi_device *spi)
472{
473 struct corgi_lcd *lcd = spi_get_drvdata(spi);
474
475 corgibl_flags &= ~CORGIBL_SUSPENDED;
476 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
477 backlight_update_status(lcd->bl_dev);
478 return 0;
479}
480#else
481#define corgi_lcd_suspend NULL
482#define corgi_lcd_resume NULL
483#endif
484
485static int setup_gpio_backlight(struct corgi_lcd *lcd,
486 struct corgi_lcd_platform_data *pdata)
487{
488 struct spi_device *spi = lcd->spi_dev;
489 int err;
490
491 lcd->gpio_backlight_on = -1;
492 lcd->gpio_backlight_cont = -1;
493
494 if (gpio_is_valid(pdata->gpio_backlight_on)) {
495 err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_on,
496 "BL_ON");
497 if (err) {
498 dev_err(&spi->dev,
499 "failed to request GPIO%d for backlight_on\n",
500 pdata->gpio_backlight_on);
501 return err;
502 }
503
504 lcd->gpio_backlight_on = pdata->gpio_backlight_on;
505 gpio_direction_output(lcd->gpio_backlight_on, 0);
506 }
507
508 if (gpio_is_valid(pdata->gpio_backlight_cont)) {
509 err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_cont,
510 "BL_CONT");
511 if (err) {
512 dev_err(&spi->dev,
513 "failed to request GPIO%d for backlight_cont\n",
514 pdata->gpio_backlight_cont);
515 return err;
516 }
517
518 lcd->gpio_backlight_cont = pdata->gpio_backlight_cont;
519
520
521
522
523 if (gpio_is_valid(lcd->gpio_backlight_on)) {
524 lcd->gpio_backlight_cont_inverted = 1;
525 gpio_direction_output(lcd->gpio_backlight_cont, 1);
526 } else {
527 lcd->gpio_backlight_cont_inverted = 0;
528 gpio_direction_output(lcd->gpio_backlight_cont, 0);
529 }
530 }
531 return 0;
532}
533
534static int corgi_lcd_probe(struct spi_device *spi)
535{
536 struct backlight_properties props;
537 struct corgi_lcd_platform_data *pdata = spi->dev.platform_data;
538 struct corgi_lcd *lcd;
539 int ret = 0;
540
541 if (pdata == NULL) {
542 dev_err(&spi->dev, "platform data not available\n");
543 return -EINVAL;
544 }
545
546 lcd = devm_kzalloc(&spi->dev, sizeof(struct corgi_lcd), GFP_KERNEL);
547 if (!lcd) {
548 dev_err(&spi->dev, "failed to allocate memory\n");
549 return -ENOMEM;
550 }
551
552 lcd->spi_dev = spi;
553
554 lcd->lcd_dev = lcd_device_register("corgi_lcd", &spi->dev,
555 lcd, &corgi_lcd_ops);
556 if (IS_ERR(lcd->lcd_dev))
557 return PTR_ERR(lcd->lcd_dev);
558
559 lcd->power = FB_BLANK_POWERDOWN;
560 lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;
561
562 memset(&props, 0, sizeof(struct backlight_properties));
563 props.type = BACKLIGHT_RAW;
564 props.max_brightness = pdata->max_intensity;
565 lcd->bl_dev = backlight_device_register("corgi_bl", &spi->dev, lcd,
566 &corgi_bl_ops, &props);
567 if (IS_ERR(lcd->bl_dev)) {
568 ret = PTR_ERR(lcd->bl_dev);
569 goto err_unregister_lcd;
570 }
571 lcd->bl_dev->props.brightness = pdata->default_intensity;
572 lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
573
574 ret = setup_gpio_backlight(lcd, pdata);
575 if (ret)
576 goto err_unregister_bl;
577
578 lcd->kick_battery = pdata->kick_battery;
579
580 spi_set_drvdata(spi, lcd);
581 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
582 backlight_update_status(lcd->bl_dev);
583
584 lcd->limit_mask = pdata->limit_mask;
585 the_corgi_lcd = lcd;
586 return 0;
587
588err_unregister_bl:
589 backlight_device_unregister(lcd->bl_dev);
590err_unregister_lcd:
591 lcd_device_unregister(lcd->lcd_dev);
592 return ret;
593}
594
595static int corgi_lcd_remove(struct spi_device *spi)
596{
597 struct corgi_lcd *lcd = spi_get_drvdata(spi);
598
599 lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
600 lcd->bl_dev->props.brightness = 0;
601 backlight_update_status(lcd->bl_dev);
602 backlight_device_unregister(lcd->bl_dev);
603
604 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
605 lcd_device_unregister(lcd->lcd_dev);
606
607 return 0;
608}
609
610static struct spi_driver corgi_lcd_driver = {
611 .driver = {
612 .name = "corgi-lcd",
613 .owner = THIS_MODULE,
614 },
615 .probe = corgi_lcd_probe,
616 .remove = corgi_lcd_remove,
617 .suspend = corgi_lcd_suspend,
618 .resume = corgi_lcd_resume,
619};
620
621module_spi_driver(corgi_lcd_driver);
622
623MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
624MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
625MODULE_LICENSE("GPL");
626MODULE_ALIAS("spi:corgi-lcd");
627
