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12#include <linux/backlight.h>
13#include <linux/delay.h>
14#include <linux/gpio/consumer.h>
15#include <linux/jiffies.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/platform_device.h>
19#include <linux/sched.h>
20#include <linux/spi/spi.h>
21
22#include "../dss/omapdss.h"
23
24#define MIPID_CMD_READ_DISP_ID 0x04
25#define MIPID_CMD_READ_RED 0x06
26#define MIPID_CMD_READ_GREEN 0x07
27#define MIPID_CMD_READ_BLUE 0x08
28#define MIPID_CMD_READ_DISP_STATUS 0x09
29#define MIPID_CMD_RDDSDR 0x0F
30#define MIPID_CMD_SLEEP_IN 0x10
31#define MIPID_CMD_SLEEP_OUT 0x11
32#define MIPID_CMD_DISP_OFF 0x28
33#define MIPID_CMD_DISP_ON 0x29
34#define MIPID_CMD_WRITE_DISP_BRIGHTNESS 0x51
35#define MIPID_CMD_READ_DISP_BRIGHTNESS 0x52
36#define MIPID_CMD_WRITE_CTRL_DISP 0x53
37
38#define CTRL_DISP_BRIGHTNESS_CTRL_ON (1 << 5)
39#define CTRL_DISP_AMBIENT_LIGHT_CTRL_ON (1 << 4)
40#define CTRL_DISP_BACKLIGHT_ON (1 << 2)
41#define CTRL_DISP_AUTO_BRIGHTNESS_ON (1 << 1)
42
43#define MIPID_CMD_READ_CTRL_DISP 0x54
44#define MIPID_CMD_WRITE_CABC 0x55
45#define MIPID_CMD_READ_CABC 0x56
46
47#define MIPID_VER_LPH8923 3
48#define MIPID_VER_LS041Y3 4
49#define MIPID_VER_L4F00311 8
50#define MIPID_VER_ACX565AKM 9
51
52struct panel_drv_data {
53 struct omap_dss_device dssdev;
54
55 struct gpio_desc *reset_gpio;
56
57 struct videomode vm;
58
59 char *name;
60 int enabled;
61 int model;
62 int revision;
63 u8 display_id[3];
64 unsigned has_bc:1;
65 unsigned has_cabc:1;
66 unsigned cabc_mode;
67 unsigned long hw_guard_end;
68
69
70 unsigned long hw_guard_wait;
71
72 struct spi_device *spi;
73 struct mutex mutex;
74
75 struct backlight_device *bl_dev;
76};
77
78static const struct videomode acx565akm_panel_vm = {
79 .hactive = 800,
80 .vactive = 480,
81 .pixelclock = 24000000,
82 .hfront_porch = 28,
83 .hsync_len = 4,
84 .hback_porch = 24,
85 .vfront_porch = 3,
86 .vsync_len = 3,
87 .vback_porch = 4,
88
89 .flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW,
90};
91
92#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
93
94static void acx565akm_transfer(struct panel_drv_data *ddata, int cmd,
95 const u8 *wbuf, int wlen, u8 *rbuf, int rlen)
96{
97 struct spi_message m;
98 struct spi_transfer *x, xfer[5];
99 int r;
100
101 BUG_ON(ddata->spi == NULL);
102
103 spi_message_init(&m);
104
105 memset(xfer, 0, sizeof(xfer));
106 x = &xfer[0];
107
108 cmd &= 0xff;
109 x->tx_buf = &cmd;
110 x->bits_per_word = 9;
111 x->len = 2;
112
113 if (rlen > 1 && wlen == 0) {
114
115
116
117
118
119 x->bits_per_word = 10;
120 cmd <<= 1;
121 }
122 spi_message_add_tail(x, &m);
123
124 if (wlen) {
125 x++;
126 x->tx_buf = wbuf;
127 x->len = wlen;
128 x->bits_per_word = 9;
129 spi_message_add_tail(x, &m);
130 }
131
132 if (rlen) {
133 x++;
134 x->rx_buf = rbuf;
135 x->len = rlen;
136 spi_message_add_tail(x, &m);
137 }
138
139 r = spi_sync(ddata->spi, &m);
140 if (r < 0)
141 dev_dbg(&ddata->spi->dev, "spi_sync %d\n", r);
142}
143
144static inline void acx565akm_cmd(struct panel_drv_data *ddata, int cmd)
145{
146 acx565akm_transfer(ddata, cmd, NULL, 0, NULL, 0);
147}
148
149static inline void acx565akm_write(struct panel_drv_data *ddata,
150 int reg, const u8 *buf, int len)
151{
152 acx565akm_transfer(ddata, reg, buf, len, NULL, 0);
153}
154
155static inline void acx565akm_read(struct panel_drv_data *ddata,
156 int reg, u8 *buf, int len)
157{
158 acx565akm_transfer(ddata, reg, NULL, 0, buf, len);
159}
160
161static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
162{
163 ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
164 ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
165}
166
167static void hw_guard_wait(struct panel_drv_data *ddata)
168{
169 unsigned long wait = ddata->hw_guard_end - jiffies;
170
171 if ((long)wait > 0 && wait <= ddata->hw_guard_wait) {
172 set_current_state(TASK_UNINTERRUPTIBLE);
173 schedule_timeout(wait);
174 }
175}
176
177static void set_sleep_mode(struct panel_drv_data *ddata, int on)
178{
179 int cmd;
180
181 if (on)
182 cmd = MIPID_CMD_SLEEP_IN;
183 else
184 cmd = MIPID_CMD_SLEEP_OUT;
185
186
187
188
189 hw_guard_wait(ddata);
190 acx565akm_cmd(ddata, cmd);
191 hw_guard_start(ddata, 120);
192}
193
194static void set_display_state(struct panel_drv_data *ddata, int enabled)
195{
196 int cmd = enabled ? MIPID_CMD_DISP_ON : MIPID_CMD_DISP_OFF;
197
198 acx565akm_cmd(ddata, cmd);
199}
200
201static int panel_enabled(struct panel_drv_data *ddata)
202{
203 __be32 v;
204 u32 disp_status;
205 int enabled;
206
207 acx565akm_read(ddata, MIPID_CMD_READ_DISP_STATUS, (u8 *)&v, 4);
208 disp_status = __be32_to_cpu(v);
209 enabled = (disp_status & (1 << 17)) && (disp_status & (1 << 10));
210 dev_dbg(&ddata->spi->dev,
211 "LCD panel %senabled by bootloader (status 0x%04x)\n",
212 enabled ? "" : "not ", disp_status);
213 return enabled;
214}
215
216static int panel_detect(struct panel_drv_data *ddata)
217{
218 acx565akm_read(ddata, MIPID_CMD_READ_DISP_ID, ddata->display_id, 3);
219 dev_dbg(&ddata->spi->dev, "MIPI display ID: %02x%02x%02x\n",
220 ddata->display_id[0],
221 ddata->display_id[1],
222 ddata->display_id[2]);
223
224 switch (ddata->display_id[0]) {
225 case 0x10:
226 ddata->model = MIPID_VER_ACX565AKM;
227 ddata->name = "acx565akm";
228 ddata->has_bc = 1;
229 ddata->has_cabc = 1;
230 break;
231 case 0x29:
232 ddata->model = MIPID_VER_L4F00311;
233 ddata->name = "l4f00311";
234 break;
235 case 0x45:
236 ddata->model = MIPID_VER_LPH8923;
237 ddata->name = "lph8923";
238 break;
239 case 0x83:
240 ddata->model = MIPID_VER_LS041Y3;
241 ddata->name = "ls041y3";
242 break;
243 default:
244 ddata->name = "unknown";
245 dev_err(&ddata->spi->dev, "invalid display ID\n");
246 return -ENODEV;
247 }
248
249 ddata->revision = ddata->display_id[1];
250
251 dev_info(&ddata->spi->dev, "omapfb: %s rev %02x LCD detected\n",
252 ddata->name, ddata->revision);
253
254 return 0;
255}
256
257
258
259static void enable_backlight_ctrl(struct panel_drv_data *ddata, int enable)
260{
261 u16 ctrl;
262
263 acx565akm_read(ddata, MIPID_CMD_READ_CTRL_DISP, (u8 *)&ctrl, 1);
264 if (enable) {
265 ctrl |= CTRL_DISP_BRIGHTNESS_CTRL_ON |
266 CTRL_DISP_BACKLIGHT_ON;
267 } else {
268 ctrl &= ~(CTRL_DISP_BRIGHTNESS_CTRL_ON |
269 CTRL_DISP_BACKLIGHT_ON);
270 }
271
272 ctrl |= 1 << 8;
273 acx565akm_write(ddata, MIPID_CMD_WRITE_CTRL_DISP, (u8 *)&ctrl, 2);
274}
275
276static void set_cabc_mode(struct panel_drv_data *ddata, unsigned int mode)
277{
278 u16 cabc_ctrl;
279
280 ddata->cabc_mode = mode;
281 if (!ddata->enabled)
282 return;
283 cabc_ctrl = 0;
284 acx565akm_read(ddata, MIPID_CMD_READ_CABC, (u8 *)&cabc_ctrl, 1);
285 cabc_ctrl &= ~3;
286 cabc_ctrl |= (1 << 8) | (mode & 3);
287 acx565akm_write(ddata, MIPID_CMD_WRITE_CABC, (u8 *)&cabc_ctrl, 2);
288}
289
290static unsigned int get_cabc_mode(struct panel_drv_data *ddata)
291{
292 return ddata->cabc_mode;
293}
294
295static unsigned int get_hw_cabc_mode(struct panel_drv_data *ddata)
296{
297 u8 cabc_ctrl;
298
299 acx565akm_read(ddata, MIPID_CMD_READ_CABC, &cabc_ctrl, 1);
300 return cabc_ctrl & 3;
301}
302
303static void acx565akm_set_brightness(struct panel_drv_data *ddata, int level)
304{
305 int bv;
306
307 bv = level | (1 << 8);
308 acx565akm_write(ddata, MIPID_CMD_WRITE_DISP_BRIGHTNESS, (u8 *)&bv, 2);
309
310 if (level)
311 enable_backlight_ctrl(ddata, 1);
312 else
313 enable_backlight_ctrl(ddata, 0);
314}
315
316static int acx565akm_get_actual_brightness(struct panel_drv_data *ddata)
317{
318 u8 bv;
319
320 acx565akm_read(ddata, MIPID_CMD_READ_DISP_BRIGHTNESS, &bv, 1);
321
322 return bv;
323}
324
325
326static int acx565akm_bl_update_status(struct backlight_device *dev)
327{
328 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
329 int level;
330
331 dev_dbg(&ddata->spi->dev, "%s\n", __func__);
332
333 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
334 dev->props.power == FB_BLANK_UNBLANK)
335 level = dev->props.brightness;
336 else
337 level = 0;
338
339 if (ddata->has_bc)
340 acx565akm_set_brightness(ddata, level);
341 else
342 return -ENODEV;
343
344 return 0;
345}
346
347static int acx565akm_bl_get_intensity(struct backlight_device *dev)
348{
349 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
350
351 dev_dbg(&dev->dev, "%s\n", __func__);
352
353 if (!ddata->has_bc)
354 return -ENODEV;
355
356 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
357 dev->props.power == FB_BLANK_UNBLANK) {
358 if (ddata->has_bc)
359 return acx565akm_get_actual_brightness(ddata);
360 else
361 return dev->props.brightness;
362 }
363
364 return 0;
365}
366
367static int acx565akm_bl_update_status_locked(struct backlight_device *dev)
368{
369 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
370 int r;
371
372 mutex_lock(&ddata->mutex);
373 r = acx565akm_bl_update_status(dev);
374 mutex_unlock(&ddata->mutex);
375
376 return r;
377}
378
379static int acx565akm_bl_get_intensity_locked(struct backlight_device *dev)
380{
381 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
382 int r;
383
384 mutex_lock(&ddata->mutex);
385 r = acx565akm_bl_get_intensity(dev);
386 mutex_unlock(&ddata->mutex);
387
388 return r;
389}
390
391static const struct backlight_ops acx565akm_bl_ops = {
392 .get_brightness = acx565akm_bl_get_intensity_locked,
393 .update_status = acx565akm_bl_update_status_locked,
394};
395
396
397
398static const char * const cabc_modes[] = {
399 "off",
400 "ui",
401 "still-image",
402 "moving-image",
403};
404
405static ssize_t show_cabc_mode(struct device *dev,
406 struct device_attribute *attr,
407 char *buf)
408{
409 struct panel_drv_data *ddata = dev_get_drvdata(dev);
410 const char *mode_str;
411 int mode;
412 int len;
413
414 if (!ddata->has_cabc)
415 mode = 0;
416 else
417 mode = get_cabc_mode(ddata);
418 mode_str = "unknown";
419 if (mode >= 0 && mode < ARRAY_SIZE(cabc_modes))
420 mode_str = cabc_modes[mode];
421 len = snprintf(buf, PAGE_SIZE, "%s\n", mode_str);
422
423 return len < PAGE_SIZE - 1 ? len : PAGE_SIZE - 1;
424}
425
426static ssize_t store_cabc_mode(struct device *dev,
427 struct device_attribute *attr,
428 const char *buf, size_t count)
429{
430 struct panel_drv_data *ddata = dev_get_drvdata(dev);
431 int i;
432
433 for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) {
434 const char *mode_str = cabc_modes[i];
435 int cmp_len = strlen(mode_str);
436
437 if (count > 0 && buf[count - 1] == '\n')
438 count--;
439 if (count != cmp_len)
440 continue;
441
442 if (strncmp(buf, mode_str, cmp_len) == 0)
443 break;
444 }
445
446 if (i == ARRAY_SIZE(cabc_modes))
447 return -EINVAL;
448
449 if (!ddata->has_cabc && i != 0)
450 return -EINVAL;
451
452 mutex_lock(&ddata->mutex);
453 set_cabc_mode(ddata, i);
454 mutex_unlock(&ddata->mutex);
455
456 return count;
457}
458
459static ssize_t show_cabc_available_modes(struct device *dev,
460 struct device_attribute *attr,
461 char *buf)
462{
463 struct panel_drv_data *ddata = dev_get_drvdata(dev);
464 int len;
465 int i;
466
467 if (!ddata->has_cabc)
468 return snprintf(buf, PAGE_SIZE, "%s\n", cabc_modes[0]);
469
470 for (i = 0, len = 0;
471 len < PAGE_SIZE && i < ARRAY_SIZE(cabc_modes); i++)
472 len += snprintf(&buf[len], PAGE_SIZE - len, "%s%s%s",
473 i ? " " : "", cabc_modes[i],
474 i == ARRAY_SIZE(cabc_modes) - 1 ? "\n" : "");
475
476 return len < PAGE_SIZE ? len : PAGE_SIZE - 1;
477}
478
479static DEVICE_ATTR(cabc_mode, S_IRUGO | S_IWUSR,
480 show_cabc_mode, store_cabc_mode);
481static DEVICE_ATTR(cabc_available_modes, S_IRUGO,
482 show_cabc_available_modes, NULL);
483
484static struct attribute *bldev_attrs[] = {
485 &dev_attr_cabc_mode.attr,
486 &dev_attr_cabc_available_modes.attr,
487 NULL,
488};
489
490static const struct attribute_group bldev_attr_group = {
491 .attrs = bldev_attrs,
492};
493
494static int acx565akm_connect(struct omap_dss_device *src,
495 struct omap_dss_device *dst)
496{
497 return 0;
498}
499
500static void acx565akm_disconnect(struct omap_dss_device *src,
501 struct omap_dss_device *dst)
502{
503}
504
505static int acx565akm_panel_power_on(struct omap_dss_device *dssdev)
506{
507 struct panel_drv_data *ddata = to_panel_data(dssdev);
508
509 dev_dbg(&ddata->spi->dev, "%s\n", __func__);
510
511
512 msleep(50);
513
514 if (ddata->reset_gpio)
515 gpiod_set_value(ddata->reset_gpio, 1);
516
517 if (ddata->enabled) {
518 dev_dbg(&ddata->spi->dev, "panel already enabled\n");
519 return 0;
520 }
521
522
523
524
525
526
527
528
529
530 msleep(120);
531
532 set_sleep_mode(ddata, 0);
533 ddata->enabled = 1;
534
535
536 usleep_range(5000, 10000);
537 set_display_state(ddata, 1);
538 set_cabc_mode(ddata, ddata->cabc_mode);
539
540 return acx565akm_bl_update_status(ddata->bl_dev);
541}
542
543static void acx565akm_panel_power_off(struct omap_dss_device *dssdev)
544{
545 struct panel_drv_data *ddata = to_panel_data(dssdev);
546
547 dev_dbg(dssdev->dev, "%s\n", __func__);
548
549 if (!ddata->enabled)
550 return;
551
552 set_display_state(ddata, 0);
553 set_sleep_mode(ddata, 1);
554 ddata->enabled = 0;
555
556
557
558
559
560
561 msleep(50);
562
563 if (ddata->reset_gpio)
564 gpiod_set_value(ddata->reset_gpio, 0);
565
566
567 msleep(100);
568}
569
570static void acx565akm_enable(struct omap_dss_device *dssdev)
571{
572 struct panel_drv_data *ddata = to_panel_data(dssdev);
573
574 mutex_lock(&ddata->mutex);
575 acx565akm_panel_power_on(dssdev);
576 mutex_unlock(&ddata->mutex);
577}
578
579static void acx565akm_disable(struct omap_dss_device *dssdev)
580{
581 struct panel_drv_data *ddata = to_panel_data(dssdev);
582
583 mutex_lock(&ddata->mutex);
584 acx565akm_panel_power_off(dssdev);
585 mutex_unlock(&ddata->mutex);
586}
587
588static int acx565akm_get_modes(struct omap_dss_device *dssdev,
589 struct drm_connector *connector)
590{
591 struct panel_drv_data *ddata = to_panel_data(dssdev);
592
593 return omapdss_display_get_modes(connector, &ddata->vm);
594}
595
596static const struct omap_dss_device_ops acx565akm_ops = {
597 .connect = acx565akm_connect,
598 .disconnect = acx565akm_disconnect,
599
600 .enable = acx565akm_enable,
601 .disable = acx565akm_disable,
602
603 .get_modes = acx565akm_get_modes,
604};
605
606static int acx565akm_probe(struct spi_device *spi)
607{
608 struct panel_drv_data *ddata;
609 struct omap_dss_device *dssdev;
610 struct backlight_device *bldev;
611 int max_brightness, brightness;
612 struct backlight_properties props;
613 struct gpio_desc *gpio;
614 int r;
615
616 dev_dbg(&spi->dev, "%s\n", __func__);
617
618 spi->mode = SPI_MODE_3;
619
620 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
621 if (ddata == NULL)
622 return -ENOMEM;
623
624 dev_set_drvdata(&spi->dev, ddata);
625
626 ddata->spi = spi;
627
628 mutex_init(&ddata->mutex);
629
630 gpio = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
631 if (IS_ERR(gpio)) {
632 dev_err(&spi->dev, "failed to parse reset gpio\n");
633 return PTR_ERR(gpio);
634 }
635
636 ddata->reset_gpio = gpio;
637
638 if (ddata->reset_gpio)
639 gpiod_set_value(ddata->reset_gpio, 1);
640
641
642
643
644
645 usleep_range(5000, 10000);
646
647 ddata->enabled = panel_enabled(ddata);
648
649 r = panel_detect(ddata);
650
651 if (!ddata->enabled && ddata->reset_gpio)
652 gpiod_set_value(ddata->reset_gpio, 0);
653
654 if (r) {
655 dev_err(&spi->dev, "%s panel detect error\n", __func__);
656 return r;
657 }
658
659 memset(&props, 0, sizeof(props));
660 props.fb_blank = FB_BLANK_UNBLANK;
661 props.power = FB_BLANK_UNBLANK;
662 props.type = BACKLIGHT_RAW;
663
664 bldev = backlight_device_register("acx565akm", &ddata->spi->dev,
665 ddata, &acx565akm_bl_ops, &props);
666 if (IS_ERR(bldev))
667 return PTR_ERR(bldev);
668 ddata->bl_dev = bldev;
669 if (ddata->has_cabc) {
670 r = sysfs_create_group(&bldev->dev.kobj, &bldev_attr_group);
671 if (r) {
672 dev_err(&bldev->dev,
673 "%s failed to create sysfs files\n", __func__);
674 goto err_backlight_unregister;
675 }
676 ddata->cabc_mode = get_hw_cabc_mode(ddata);
677 }
678
679 max_brightness = 255;
680
681 if (ddata->has_bc)
682 brightness = acx565akm_get_actual_brightness(ddata);
683 else
684 brightness = 0;
685
686 bldev->props.max_brightness = max_brightness;
687 bldev->props.brightness = brightness;
688
689 acx565akm_bl_update_status(bldev);
690
691
692 ddata->vm = acx565akm_panel_vm;
693
694 dssdev = &ddata->dssdev;
695 dssdev->dev = &spi->dev;
696 dssdev->ops = &acx565akm_ops;
697 dssdev->type = OMAP_DISPLAY_TYPE_SDI;
698 dssdev->display = true;
699 dssdev->owner = THIS_MODULE;
700 dssdev->of_ports = BIT(0);
701 dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
702 dssdev->bus_flags = DRM_BUS_FLAG_DE_HIGH
703 | DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE
704 | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
705
706 omapdss_display_init(dssdev);
707 omapdss_device_register(dssdev);
708
709 return 0;
710
711err_backlight_unregister:
712 backlight_device_unregister(bldev);
713 return r;
714}
715
716static int acx565akm_remove(struct spi_device *spi)
717{
718 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
719 struct omap_dss_device *dssdev = &ddata->dssdev;
720
721 dev_dbg(&ddata->spi->dev, "%s\n", __func__);
722
723 sysfs_remove_group(&ddata->bl_dev->dev.kobj, &bldev_attr_group);
724 backlight_device_unregister(ddata->bl_dev);
725
726 omapdss_device_unregister(dssdev);
727
728 if (omapdss_device_is_enabled(dssdev))
729 acx565akm_disable(dssdev);
730
731 return 0;
732}
733
734static const struct of_device_id acx565akm_of_match[] = {
735 { .compatible = "omapdss,sony,acx565akm", },
736 {},
737};
738MODULE_DEVICE_TABLE(of, acx565akm_of_match);
739
740static struct spi_driver acx565akm_driver = {
741 .driver = {
742 .name = "acx565akm",
743 .of_match_table = acx565akm_of_match,
744 .suppress_bind_attrs = true,
745 },
746 .probe = acx565akm_probe,
747 .remove = acx565akm_remove,
748};
749
750module_spi_driver(acx565akm_driver);
751
752MODULE_ALIAS("spi:sony,acx565akm");
753MODULE_AUTHOR("Nokia Corporation");
754MODULE_DESCRIPTION("acx565akm LCD Driver");
755MODULE_LICENSE("GPL");
756
