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16#include <linux/delay.h>
17#include <linux/dma-buf.h>
18#include <linux/gpio/consumer.h>
19#include <linux/module.h>
20#include <linux/property.h>
21#include <linux/sched/clock.h>
22#include <linux/spi/spi.h>
23#include <linux/thermal.h>
24
25#include <drm/drm_atomic_helper.h>
26#include <drm/drm_connector.h>
27#include <drm/drm_damage_helper.h>
28#include <drm/drm_drv.h>
29#include <drm/drm_fb_cma_helper.h>
30#include <drm/drm_fb_helper.h>
31#include <drm/drm_format_helper.h>
32#include <drm/drm_gem_cma_helper.h>
33#include <drm/drm_gem_framebuffer_helper.h>
34#include <drm/drm_managed.h>
35#include <drm/drm_modes.h>
36#include <drm/drm_rect.h>
37#include <drm/drm_probe_helper.h>
38#include <drm/drm_simple_kms_helper.h>
39
40#define REPAPER_RID_G2_COG_ID 0x12
41
42enum repaper_model {
43
44 E1144CS021 = 1,
45 E1190CS021,
46 E2200CS021,
47 E2271CS021,
48};
49
50enum repaper_stage {
51 REPAPER_COMPENSATE,
52 REPAPER_WHITE,
53 REPAPER_INVERSE,
54 REPAPER_NORMAL
55};
56
57enum repaper_epd_border_byte {
58 REPAPER_BORDER_BYTE_NONE,
59 REPAPER_BORDER_BYTE_ZERO,
60 REPAPER_BORDER_BYTE_SET,
61};
62
63struct repaper_epd {
64 struct drm_device drm;
65 struct drm_simple_display_pipe pipe;
66 const struct drm_display_mode *mode;
67 struct drm_connector connector;
68 struct spi_device *spi;
69
70 struct gpio_desc *panel_on;
71 struct gpio_desc *border;
72 struct gpio_desc *discharge;
73 struct gpio_desc *reset;
74 struct gpio_desc *busy;
75
76 struct thermal_zone_device *thermal;
77
78 unsigned int height;
79 unsigned int width;
80 unsigned int bytes_per_scan;
81 const u8 *channel_select;
82 unsigned int stage_time;
83 unsigned int factored_stage_time;
84 bool middle_scan;
85 bool pre_border_byte;
86 enum repaper_epd_border_byte border_byte;
87
88 u8 *line_buffer;
89 void *current_frame;
90
91 bool enabled;
92 bool cleared;
93 bool partial;
94};
95
96static inline struct repaper_epd *drm_to_epd(struct drm_device *drm)
97{
98 return container_of(drm, struct repaper_epd, drm);
99}
100
101static int repaper_spi_transfer(struct spi_device *spi, u8 header,
102 const void *tx, void *rx, size_t len)
103{
104 void *txbuf = NULL, *rxbuf = NULL;
105 struct spi_transfer tr[2] = {};
106 u8 *headerbuf;
107 int ret;
108
109 headerbuf = kmalloc(1, GFP_KERNEL);
110 if (!headerbuf)
111 return -ENOMEM;
112
113 headerbuf[0] = header;
114 tr[0].tx_buf = headerbuf;
115 tr[0].len = 1;
116
117
118 if (tx && len <= 32) {
119 txbuf = kmemdup(tx, len, GFP_KERNEL);
120 if (!txbuf) {
121 ret = -ENOMEM;
122 goto out_free;
123 }
124 }
125
126 if (rx) {
127 rxbuf = kmalloc(len, GFP_KERNEL);
128 if (!rxbuf) {
129 ret = -ENOMEM;
130 goto out_free;
131 }
132 }
133
134 tr[1].tx_buf = txbuf ? txbuf : tx;
135 tr[1].rx_buf = rxbuf;
136 tr[1].len = len;
137
138 ndelay(80);
139 ret = spi_sync_transfer(spi, tr, 2);
140 if (rx && !ret)
141 memcpy(rx, rxbuf, len);
142
143out_free:
144 kfree(headerbuf);
145 kfree(txbuf);
146 kfree(rxbuf);
147
148 return ret;
149}
150
151static int repaper_write_buf(struct spi_device *spi, u8 reg,
152 const u8 *buf, size_t len)
153{
154 int ret;
155
156 ret = repaper_spi_transfer(spi, 0x70, ®, NULL, 1);
157 if (ret)
158 return ret;
159
160 return repaper_spi_transfer(spi, 0x72, buf, NULL, len);
161}
162
163static int repaper_write_val(struct spi_device *spi, u8 reg, u8 val)
164{
165 return repaper_write_buf(spi, reg, &val, 1);
166}
167
168static int repaper_read_val(struct spi_device *spi, u8 reg)
169{
170 int ret;
171 u8 val;
172
173 ret = repaper_spi_transfer(spi, 0x70, ®, NULL, 1);
174 if (ret)
175 return ret;
176
177 ret = repaper_spi_transfer(spi, 0x73, NULL, &val, 1);
178
179 return ret ? ret : val;
180}
181
182static int repaper_read_id(struct spi_device *spi)
183{
184 int ret;
185 u8 id;
186
187 ret = repaper_spi_transfer(spi, 0x71, NULL, &id, 1);
188
189 return ret ? ret : id;
190}
191
192static void repaper_spi_mosi_low(struct spi_device *spi)
193{
194 const u8 buf[1] = { 0 };
195
196 spi_write(spi, buf, 1);
197}
198
199
200static void repaper_even_pixels(struct repaper_epd *epd, u8 **pp,
201 const u8 *data, u8 fixed_value, const u8 *mask,
202 enum repaper_stage stage)
203{
204 unsigned int b;
205
206 for (b = 0; b < (epd->width / 8); b++) {
207 if (data) {
208 u8 pixels = data[b] & 0xaa;
209 u8 pixel_mask = 0xff;
210 u8 p1, p2, p3, p4;
211
212 if (mask) {
213 pixel_mask = (mask[b] ^ pixels) & 0xaa;
214 pixel_mask |= pixel_mask >> 1;
215 }
216
217 switch (stage) {
218 case REPAPER_COMPENSATE:
219 pixels = 0xaa | ((pixels ^ 0xaa) >> 1);
220 break;
221 case REPAPER_WHITE:
222 pixels = 0x55 + ((pixels ^ 0xaa) >> 1);
223 break;
224 case REPAPER_INVERSE:
225 pixels = 0x55 | (pixels ^ 0xaa);
226 break;
227 case REPAPER_NORMAL:
228 pixels = 0xaa | (pixels >> 1);
229 break;
230 }
231
232 pixels = (pixels & pixel_mask) | (~pixel_mask & 0x55);
233 p1 = (pixels >> 6) & 0x03;
234 p2 = (pixels >> 4) & 0x03;
235 p3 = (pixels >> 2) & 0x03;
236 p4 = (pixels >> 0) & 0x03;
237 pixels = (p1 << 0) | (p2 << 2) | (p3 << 4) | (p4 << 6);
238 *(*pp)++ = pixels;
239 } else {
240 *(*pp)++ = fixed_value;
241 }
242 }
243}
244
245
246static void repaper_odd_pixels(struct repaper_epd *epd, u8 **pp,
247 const u8 *data, u8 fixed_value, const u8 *mask,
248 enum repaper_stage stage)
249{
250 unsigned int b;
251
252 for (b = epd->width / 8; b > 0; b--) {
253 if (data) {
254 u8 pixels = data[b - 1] & 0x55;
255 u8 pixel_mask = 0xff;
256
257 if (mask) {
258 pixel_mask = (mask[b - 1] ^ pixels) & 0x55;
259 pixel_mask |= pixel_mask << 1;
260 }
261
262 switch (stage) {
263 case REPAPER_COMPENSATE:
264 pixels = 0xaa | (pixels ^ 0x55);
265 break;
266 case REPAPER_WHITE:
267 pixels = 0x55 + (pixels ^ 0x55);
268 break;
269 case REPAPER_INVERSE:
270 pixels = 0x55 | ((pixels ^ 0x55) << 1);
271 break;
272 case REPAPER_NORMAL:
273 pixels = 0xaa | pixels;
274 break;
275 }
276
277 pixels = (pixels & pixel_mask) | (~pixel_mask & 0x55);
278 *(*pp)++ = pixels;
279 } else {
280 *(*pp)++ = fixed_value;
281 }
282 }
283}
284
285
286static inline u16 repaper_interleave_bits(u16 value)
287{
288 value = (value | (value << 4)) & 0x0f0f;
289 value = (value | (value << 2)) & 0x3333;
290 value = (value | (value << 1)) & 0x5555;
291
292 return value;
293}
294
295
296static void repaper_all_pixels(struct repaper_epd *epd, u8 **pp,
297 const u8 *data, u8 fixed_value, const u8 *mask,
298 enum repaper_stage stage)
299{
300 unsigned int b;
301
302 for (b = epd->width / 8; b > 0; b--) {
303 if (data) {
304 u16 pixels = repaper_interleave_bits(data[b - 1]);
305 u16 pixel_mask = 0xffff;
306
307 if (mask) {
308 pixel_mask = repaper_interleave_bits(mask[b - 1]);
309
310 pixel_mask = (pixel_mask ^ pixels) & 0x5555;
311 pixel_mask |= pixel_mask << 1;
312 }
313
314 switch (stage) {
315 case REPAPER_COMPENSATE:
316 pixels = 0xaaaa | (pixels ^ 0x5555);
317 break;
318 case REPAPER_WHITE:
319 pixels = 0x5555 + (pixels ^ 0x5555);
320 break;
321 case REPAPER_INVERSE:
322 pixels = 0x5555 | ((pixels ^ 0x5555) << 1);
323 break;
324 case REPAPER_NORMAL:
325 pixels = 0xaaaa | pixels;
326 break;
327 }
328
329 pixels = (pixels & pixel_mask) | (~pixel_mask & 0x5555);
330 *(*pp)++ = pixels >> 8;
331 *(*pp)++ = pixels;
332 } else {
333 *(*pp)++ = fixed_value;
334 *(*pp)++ = fixed_value;
335 }
336 }
337}
338
339
340static void repaper_one_line(struct repaper_epd *epd, unsigned int line,
341 const u8 *data, u8 fixed_value, const u8 *mask,
342 enum repaper_stage stage)
343{
344 u8 *p = epd->line_buffer;
345 unsigned int b;
346
347 repaper_spi_mosi_low(epd->spi);
348
349 if (epd->pre_border_byte)
350 *p++ = 0x00;
351
352 if (epd->middle_scan) {
353
354 repaper_odd_pixels(epd, &p, data, fixed_value, mask, stage);
355
356
357 for (b = epd->bytes_per_scan; b > 0; b--) {
358 if (line / 4 == b - 1)
359 *p++ = 0x03 << (2 * (line & 0x03));
360 else
361 *p++ = 0x00;
362 }
363
364
365 repaper_even_pixels(epd, &p, data, fixed_value, mask, stage);
366 } else {
367
368
369
370
371 for (b = 0; b < epd->bytes_per_scan; b++) {
372 if (0 != (line & 0x01) && line / 8 == b)
373 *p++ = 0xc0 >> (line & 0x06);
374 else
375 *p++ = 0x00;
376 }
377
378
379 repaper_all_pixels(epd, &p, data, fixed_value, mask, stage);
380
381
382
383
384
385 for (b = epd->bytes_per_scan; b > 0; b--) {
386 if (0 == (line & 0x01) && line / 8 == b - 1)
387 *p++ = 0x03 << (line & 0x06);
388 else
389 *p++ = 0x00;
390 }
391 }
392
393 switch (epd->border_byte) {
394 case REPAPER_BORDER_BYTE_NONE:
395 break;
396
397 case REPAPER_BORDER_BYTE_ZERO:
398 *p++ = 0x00;
399 break;
400
401 case REPAPER_BORDER_BYTE_SET:
402 switch (stage) {
403 case REPAPER_COMPENSATE:
404 case REPAPER_WHITE:
405 case REPAPER_INVERSE:
406 *p++ = 0x00;
407 break;
408 case REPAPER_NORMAL:
409 *p++ = 0xaa;
410 break;
411 }
412 break;
413 }
414
415 repaper_write_buf(epd->spi, 0x0a, epd->line_buffer,
416 p - epd->line_buffer);
417
418
419 repaper_write_val(epd->spi, 0x02, 0x07);
420
421 repaper_spi_mosi_low(epd->spi);
422}
423
424static void repaper_frame_fixed(struct repaper_epd *epd, u8 fixed_value,
425 enum repaper_stage stage)
426{
427 unsigned int line;
428
429 for (line = 0; line < epd->height; line++)
430 repaper_one_line(epd, line, NULL, fixed_value, NULL, stage);
431}
432
433static void repaper_frame_data(struct repaper_epd *epd, const u8 *image,
434 const u8 *mask, enum repaper_stage stage)
435{
436 unsigned int line;
437
438 if (!mask) {
439 for (line = 0; line < epd->height; line++) {
440 repaper_one_line(epd, line,
441 &image[line * (epd->width / 8)],
442 0, NULL, stage);
443 }
444 } else {
445 for (line = 0; line < epd->height; line++) {
446 size_t n = line * epd->width / 8;
447
448 repaper_one_line(epd, line, &image[n], 0, &mask[n],
449 stage);
450 }
451 }
452}
453
454static void repaper_frame_fixed_repeat(struct repaper_epd *epd, u8 fixed_value,
455 enum repaper_stage stage)
456{
457 u64 start = local_clock();
458 u64 end = start + (epd->factored_stage_time * 1000 * 1000);
459
460 do {
461 repaper_frame_fixed(epd, fixed_value, stage);
462 } while (local_clock() < end);
463}
464
465static void repaper_frame_data_repeat(struct repaper_epd *epd, const u8 *image,
466 const u8 *mask, enum repaper_stage stage)
467{
468 u64 start = local_clock();
469 u64 end = start + (epd->factored_stage_time * 1000 * 1000);
470
471 do {
472 repaper_frame_data(epd, image, mask, stage);
473 } while (local_clock() < end);
474}
475
476static void repaper_get_temperature(struct repaper_epd *epd)
477{
478 int ret, temperature = 0;
479 unsigned int factor10x;
480
481 if (!epd->thermal)
482 return;
483
484 ret = thermal_zone_get_temp(epd->thermal, &temperature);
485 if (ret) {
486 DRM_DEV_ERROR(&epd->spi->dev, "Failed to get temperature (%d)\n", ret);
487 return;
488 }
489
490 temperature /= 1000;
491
492 if (temperature <= -10)
493 factor10x = 170;
494 else if (temperature <= -5)
495 factor10x = 120;
496 else if (temperature <= 5)
497 factor10x = 80;
498 else if (temperature <= 10)
499 factor10x = 40;
500 else if (temperature <= 15)
501 factor10x = 30;
502 else if (temperature <= 20)
503 factor10x = 20;
504 else if (temperature <= 40)
505 factor10x = 10;
506 else
507 factor10x = 7;
508
509 epd->factored_stage_time = epd->stage_time * factor10x / 10;
510}
511
512static void repaper_gray8_to_mono_reversed(u8 *buf, u32 width, u32 height)
513{
514 u8 *gray8 = buf, *mono = buf;
515 int y, xb, i;
516
517 for (y = 0; y < height; y++)
518 for (xb = 0; xb < width / 8; xb++) {
519 u8 byte = 0x00;
520
521 for (i = 0; i < 8; i++) {
522 int x = xb * 8 + i;
523
524 byte >>= 1;
525 if (gray8[y * width + x] >> 7)
526 byte |= BIT(7);
527 }
528 *mono++ = byte;
529 }
530}
531
532static int repaper_fb_dirty(struct drm_framebuffer *fb)
533{
534 struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
535 struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
536 struct repaper_epd *epd = drm_to_epd(fb->dev);
537 struct drm_rect clip;
538 int idx, ret = 0;
539 u8 *buf = NULL;
540
541 if (!epd->enabled)
542 return 0;
543
544 if (!drm_dev_enter(fb->dev, &idx))
545 return -ENODEV;
546
547
548 clip.x1 = 0;
549 clip.x2 = fb->width;
550 clip.y1 = 0;
551 clip.y2 = fb->height;
552
553 repaper_get_temperature(epd);
554
555 DRM_DEBUG("Flushing [FB:%d] st=%ums\n", fb->base.id,
556 epd->factored_stage_time);
557
558 buf = kmalloc_array(fb->width, fb->height, GFP_KERNEL);
559 if (!buf) {
560 ret = -ENOMEM;
561 goto out_exit;
562 }
563
564 if (import_attach) {
565 ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
566 DMA_FROM_DEVICE);
567 if (ret)
568 goto out_free;
569 }
570
571 drm_fb_xrgb8888_to_gray8(buf, cma_obj->vaddr, fb, &clip);
572
573 if (import_attach) {
574 ret = dma_buf_end_cpu_access(import_attach->dmabuf,
575 DMA_FROM_DEVICE);
576 if (ret)
577 goto out_free;
578 }
579
580 repaper_gray8_to_mono_reversed(buf, fb->width, fb->height);
581
582 if (epd->partial) {
583 repaper_frame_data_repeat(epd, buf, epd->current_frame,
584 REPAPER_NORMAL);
585 } else if (epd->cleared) {
586 repaper_frame_data_repeat(epd, epd->current_frame, NULL,
587 REPAPER_COMPENSATE);
588 repaper_frame_data_repeat(epd, epd->current_frame, NULL,
589 REPAPER_WHITE);
590 repaper_frame_data_repeat(epd, buf, NULL, REPAPER_INVERSE);
591 repaper_frame_data_repeat(epd, buf, NULL, REPAPER_NORMAL);
592
593 epd->partial = true;
594 } else {
595
596 repaper_frame_fixed_repeat(epd, 0xff, REPAPER_COMPENSATE);
597 repaper_frame_fixed_repeat(epd, 0xff, REPAPER_WHITE);
598 repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_INVERSE);
599 repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_NORMAL);
600
601
602 repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_COMPENSATE);
603 repaper_frame_fixed_repeat(epd, 0xaa, REPAPER_WHITE);
604 repaper_frame_data_repeat(epd, buf, NULL, REPAPER_INVERSE);
605 repaper_frame_data_repeat(epd, buf, NULL, REPAPER_NORMAL);
606
607 epd->cleared = true;
608 epd->partial = true;
609 }
610
611 memcpy(epd->current_frame, buf, fb->width * fb->height / 8);
612
613
614
615
616
617 if (epd->pre_border_byte) {
618 unsigned int x;
619
620 for (x = 0; x < (fb->width / 8); x++)
621 if (buf[x + (fb->width * (fb->height - 1) / 8)]) {
622 repaper_frame_data_repeat(epd, buf,
623 epd->current_frame,
624 REPAPER_NORMAL);
625 break;
626 }
627 }
628
629out_free:
630 kfree(buf);
631out_exit:
632 drm_dev_exit(idx);
633
634 return ret;
635}
636
637static void power_off(struct repaper_epd *epd)
638{
639
640 gpiod_set_value_cansleep(epd->reset, 0);
641 gpiod_set_value_cansleep(epd->panel_on, 0);
642 if (epd->border)
643 gpiod_set_value_cansleep(epd->border, 0);
644
645
646 repaper_spi_mosi_low(epd->spi);
647
648
649 gpiod_set_value_cansleep(epd->discharge, 1);
650 msleep(150);
651 gpiod_set_value_cansleep(epd->discharge, 0);
652}
653
654static void repaper_pipe_enable(struct drm_simple_display_pipe *pipe,
655 struct drm_crtc_state *crtc_state,
656 struct drm_plane_state *plane_state)
657{
658 struct repaper_epd *epd = drm_to_epd(pipe->crtc.dev);
659 struct spi_device *spi = epd->spi;
660 struct device *dev = &spi->dev;
661 bool dc_ok = false;
662 int i, ret, idx;
663
664 if (!drm_dev_enter(pipe->crtc.dev, &idx))
665 return;
666
667 DRM_DEBUG_DRIVER("\n");
668
669
670 gpiod_set_value_cansleep(epd->reset, 0);
671 gpiod_set_value_cansleep(epd->panel_on, 0);
672 gpiod_set_value_cansleep(epd->discharge, 0);
673 if (epd->border)
674 gpiod_set_value_cansleep(epd->border, 0);
675 repaper_spi_mosi_low(spi);
676 usleep_range(5000, 10000);
677
678 gpiod_set_value_cansleep(epd->panel_on, 1);
679
680
681
682
683 usleep_range(10000, 15000);
684 gpiod_set_value_cansleep(epd->reset, 1);
685 if (epd->border)
686 gpiod_set_value_cansleep(epd->border, 1);
687 usleep_range(5000, 10000);
688 gpiod_set_value_cansleep(epd->reset, 0);
689 usleep_range(5000, 10000);
690 gpiod_set_value_cansleep(epd->reset, 1);
691 usleep_range(5000, 10000);
692
693
694 for (i = 100; i > 0; i--) {
695 if (!gpiod_get_value_cansleep(epd->busy))
696 break;
697
698 usleep_range(10, 100);
699 }
700
701 if (!i) {
702 DRM_DEV_ERROR(dev, "timeout waiting for panel to become ready.\n");
703 power_off(epd);
704 goto out_exit;
705 }
706
707 repaper_read_id(spi);
708 ret = repaper_read_id(spi);
709 if (ret != REPAPER_RID_G2_COG_ID) {
710 if (ret < 0)
711 dev_err(dev, "failed to read chip (%d)\n", ret);
712 else
713 dev_err(dev, "wrong COG ID 0x%02x\n", ret);
714 power_off(epd);
715 goto out_exit;
716 }
717
718
719 repaper_write_val(spi, 0x02, 0x40);
720
721 ret = repaper_read_val(spi, 0x0f);
722 if (ret < 0 || !(ret & 0x80)) {
723 if (ret < 0)
724 DRM_DEV_ERROR(dev, "failed to read chip (%d)\n", ret);
725 else
726 DRM_DEV_ERROR(dev, "panel is reported broken\n");
727 power_off(epd);
728 goto out_exit;
729 }
730
731
732 repaper_write_val(spi, 0x0b, 0x02);
733
734 repaper_write_buf(spi, 0x01, epd->channel_select, 8);
735
736 repaper_write_val(spi, 0x07, 0xd1);
737
738 repaper_write_val(spi, 0x08, 0x02);
739
740 repaper_write_val(spi, 0x09, 0xc2);
741
742 repaper_write_val(spi, 0x04, 0x03);
743
744 repaper_write_val(spi, 0x03, 0x01);
745
746 repaper_write_val(spi, 0x03, 0x00);
747 usleep_range(5000, 10000);
748
749
750 for (i = 0; i < 4; ++i) {
751
752 repaper_write_val(spi, 0x05, 0x01);
753 msleep(240);
754
755
756 repaper_write_val(spi, 0x05, 0x03);
757 msleep(40);
758
759
760 repaper_write_val(spi, 0x05, 0x0f);
761 msleep(40);
762
763
764 ret = repaper_read_val(spi, 0x0f);
765 if (ret < 0) {
766 DRM_DEV_ERROR(dev, "failed to read chip (%d)\n", ret);
767 power_off(epd);
768 goto out_exit;
769 }
770
771 if (ret & 0x40) {
772 dc_ok = true;
773 break;
774 }
775 }
776
777 if (!dc_ok) {
778 DRM_DEV_ERROR(dev, "dc/dc failed\n");
779 power_off(epd);
780 goto out_exit;
781 }
782
783
784
785
786
787 repaper_write_val(spi, 0x02, 0x04);
788
789 epd->enabled = true;
790 epd->partial = false;
791out_exit:
792 drm_dev_exit(idx);
793}
794
795static void repaper_pipe_disable(struct drm_simple_display_pipe *pipe)
796{
797 struct repaper_epd *epd = drm_to_epd(pipe->crtc.dev);
798 struct spi_device *spi = epd->spi;
799 unsigned int line;
800
801
802
803
804
805
806
807
808 if (!epd->enabled)
809 return;
810
811 DRM_DEBUG_DRIVER("\n");
812
813 epd->enabled = false;
814
815
816 for (line = 0; line < epd->height; line++)
817 repaper_one_line(epd, 0x7fffu, NULL, 0x00, NULL,
818 REPAPER_COMPENSATE);
819
820
821 if (epd->border) {
822
823 repaper_one_line(epd, 0x7fffu, NULL, 0x00, NULL,
824 REPAPER_COMPENSATE);
825 msleep(25);
826 gpiod_set_value_cansleep(epd->border, 0);
827 msleep(200);
828 gpiod_set_value_cansleep(epd->border, 1);
829 } else {
830
831 repaper_one_line(epd, 0x7fffu, NULL, 0x00, NULL,
832 REPAPER_NORMAL);
833 msleep(200);
834 }
835
836
837 repaper_write_val(spi, 0x0b, 0x00);
838
839 repaper_write_val(spi, 0x03, 0x01);
840
841 repaper_write_val(spi, 0x05, 0x03);
842
843 repaper_write_val(spi, 0x05, 0x01);
844 msleep(120);
845
846 repaper_write_val(spi, 0x04, 0x80);
847
848 repaper_write_val(spi, 0x05, 0x00);
849
850 repaper_write_val(spi, 0x07, 0x01);
851 msleep(50);
852
853 power_off(epd);
854}
855
856static void repaper_pipe_update(struct drm_simple_display_pipe *pipe,
857 struct drm_plane_state *old_state)
858{
859 struct drm_plane_state *state = pipe->plane.state;
860 struct drm_rect rect;
861
862 if (drm_atomic_helper_damage_merged(old_state, state, &rect))
863 repaper_fb_dirty(state->fb);
864}
865
866static const struct drm_simple_display_pipe_funcs repaper_pipe_funcs = {
867 .enable = repaper_pipe_enable,
868 .disable = repaper_pipe_disable,
869 .update = repaper_pipe_update,
870 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
871};
872
873static int repaper_connector_get_modes(struct drm_connector *connector)
874{
875 struct repaper_epd *epd = drm_to_epd(connector->dev);
876 struct drm_display_mode *mode;
877
878 mode = drm_mode_duplicate(connector->dev, epd->mode);
879 if (!mode) {
880 DRM_ERROR("Failed to duplicate mode\n");
881 return 0;
882 }
883
884 drm_mode_set_name(mode);
885 mode->type |= DRM_MODE_TYPE_PREFERRED;
886 drm_mode_probed_add(connector, mode);
887
888 connector->display_info.width_mm = mode->width_mm;
889 connector->display_info.height_mm = mode->height_mm;
890
891 return 1;
892}
893
894static const struct drm_connector_helper_funcs repaper_connector_hfuncs = {
895 .get_modes = repaper_connector_get_modes,
896};
897
898static const struct drm_connector_funcs repaper_connector_funcs = {
899 .reset = drm_atomic_helper_connector_reset,
900 .fill_modes = drm_helper_probe_single_connector_modes,
901 .destroy = drm_connector_cleanup,
902 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
903 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
904};
905
906static const struct drm_mode_config_funcs repaper_mode_config_funcs = {
907 .fb_create = drm_gem_fb_create_with_dirty,
908 .atomic_check = drm_atomic_helper_check,
909 .atomic_commit = drm_atomic_helper_commit,
910};
911
912static const uint32_t repaper_formats[] = {
913 DRM_FORMAT_XRGB8888,
914};
915
916static const struct drm_display_mode repaper_e1144cs021_mode = {
917 DRM_SIMPLE_MODE(128, 96, 29, 22),
918};
919
920static const u8 repaper_e1144cs021_cs[] = { 0x00, 0x00, 0x00, 0x00,
921 0x00, 0x0f, 0xff, 0x00 };
922
923static const struct drm_display_mode repaper_e1190cs021_mode = {
924 DRM_SIMPLE_MODE(144, 128, 36, 32),
925};
926
927static const u8 repaper_e1190cs021_cs[] = { 0x00, 0x00, 0x00, 0x03,
928 0xfc, 0x00, 0x00, 0xff };
929
930static const struct drm_display_mode repaper_e2200cs021_mode = {
931 DRM_SIMPLE_MODE(200, 96, 46, 22),
932};
933
934static const u8 repaper_e2200cs021_cs[] = { 0x00, 0x00, 0x00, 0x00,
935 0x01, 0xff, 0xe0, 0x00 };
936
937static const struct drm_display_mode repaper_e2271cs021_mode = {
938 DRM_SIMPLE_MODE(264, 176, 57, 38),
939};
940
941static const u8 repaper_e2271cs021_cs[] = { 0x00, 0x00, 0x00, 0x7f,
942 0xff, 0xfe, 0x00, 0x00 };
943
944DEFINE_DRM_GEM_CMA_FOPS(repaper_fops);
945
946static struct drm_driver repaper_driver = {
947 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
948 .fops = &repaper_fops,
949 DRM_GEM_CMA_VMAP_DRIVER_OPS,
950 .name = "repaper",
951 .desc = "Pervasive Displays RePaper e-ink panels",
952 .date = "20170405",
953 .major = 1,
954 .minor = 0,
955};
956
957static const struct of_device_id repaper_of_match[] = {
958 { .compatible = "pervasive,e1144cs021", .data = (void *)E1144CS021 },
959 { .compatible = "pervasive,e1190cs021", .data = (void *)E1190CS021 },
960 { .compatible = "pervasive,e2200cs021", .data = (void *)E2200CS021 },
961 { .compatible = "pervasive,e2271cs021", .data = (void *)E2271CS021 },
962 {},
963};
964MODULE_DEVICE_TABLE(of, repaper_of_match);
965
966static const struct spi_device_id repaper_id[] = {
967 { "e1144cs021", E1144CS021 },
968 { "e1190cs021", E1190CS021 },
969 { "e2200cs021", E2200CS021 },
970 { "e2271cs021", E2271CS021 },
971 { },
972};
973MODULE_DEVICE_TABLE(spi, repaper_id);
974
975static int repaper_probe(struct spi_device *spi)
976{
977 const struct drm_display_mode *mode;
978 const struct spi_device_id *spi_id;
979 struct device *dev = &spi->dev;
980 enum repaper_model model;
981 const char *thermal_zone;
982 struct repaper_epd *epd;
983 size_t line_buffer_size;
984 struct drm_device *drm;
985 const void *match;
986 int ret;
987
988 match = device_get_match_data(dev);
989 if (match) {
990 model = (enum repaper_model)match;
991 } else {
992 spi_id = spi_get_device_id(spi);
993 model = (enum repaper_model)spi_id->driver_data;
994 }
995
996
997 if (!dev->coherent_dma_mask) {
998 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
999 if (ret) {
1000 dev_warn(dev, "Failed to set dma mask %d\n", ret);
1001 return ret;
1002 }
1003 }
1004
1005 epd = devm_drm_dev_alloc(dev, &repaper_driver,
1006 struct repaper_epd, drm);
1007 if (IS_ERR(epd))
1008 return PTR_ERR(epd);
1009
1010 drm = &epd->drm;
1011
1012 ret = drmm_mode_config_init(drm);
1013 if (ret)
1014 return ret;
1015 drm->mode_config.funcs = &repaper_mode_config_funcs;
1016
1017 epd->spi = spi;
1018
1019 epd->panel_on = devm_gpiod_get(dev, "panel-on", GPIOD_OUT_LOW);
1020 if (IS_ERR(epd->panel_on)) {
1021 ret = PTR_ERR(epd->panel_on);
1022 if (ret != -EPROBE_DEFER)
1023 DRM_DEV_ERROR(dev, "Failed to get gpio 'panel-on'\n");
1024 return ret;
1025 }
1026
1027 epd->discharge = devm_gpiod_get(dev, "discharge", GPIOD_OUT_LOW);
1028 if (IS_ERR(epd->discharge)) {
1029 ret = PTR_ERR(epd->discharge);
1030 if (ret != -EPROBE_DEFER)
1031 DRM_DEV_ERROR(dev, "Failed to get gpio 'discharge'\n");
1032 return ret;
1033 }
1034
1035 epd->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
1036 if (IS_ERR(epd->reset)) {
1037 ret = PTR_ERR(epd->reset);
1038 if (ret != -EPROBE_DEFER)
1039 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
1040 return ret;
1041 }
1042
1043 epd->busy = devm_gpiod_get(dev, "busy", GPIOD_IN);
1044 if (IS_ERR(epd->busy)) {
1045 ret = PTR_ERR(epd->busy);
1046 if (ret != -EPROBE_DEFER)
1047 DRM_DEV_ERROR(dev, "Failed to get gpio 'busy'\n");
1048 return ret;
1049 }
1050
1051 if (!device_property_read_string(dev, "pervasive,thermal-zone",
1052 &thermal_zone)) {
1053 epd->thermal = thermal_zone_get_zone_by_name(thermal_zone);
1054 if (IS_ERR(epd->thermal)) {
1055 DRM_DEV_ERROR(dev, "Failed to get thermal zone: %s\n", thermal_zone);
1056 return PTR_ERR(epd->thermal);
1057 }
1058 }
1059
1060 switch (model) {
1061 case E1144CS021:
1062 mode = &repaper_e1144cs021_mode;
1063 epd->channel_select = repaper_e1144cs021_cs;
1064 epd->stage_time = 480;
1065 epd->bytes_per_scan = 96 / 4;
1066 epd->middle_scan = true;
1067 epd->pre_border_byte = false;
1068 epd->border_byte = REPAPER_BORDER_BYTE_ZERO;
1069 break;
1070
1071 case E1190CS021:
1072 mode = &repaper_e1190cs021_mode;
1073 epd->channel_select = repaper_e1190cs021_cs;
1074 epd->stage_time = 480;
1075 epd->bytes_per_scan = 128 / 4 / 2;
1076 epd->middle_scan = false;
1077 epd->pre_border_byte = false;
1078 epd->border_byte = REPAPER_BORDER_BYTE_SET;
1079 break;
1080
1081 case E2200CS021:
1082 mode = &repaper_e2200cs021_mode;
1083 epd->channel_select = repaper_e2200cs021_cs;
1084 epd->stage_time = 480;
1085 epd->bytes_per_scan = 96 / 4;
1086 epd->middle_scan = true;
1087 epd->pre_border_byte = true;
1088 epd->border_byte = REPAPER_BORDER_BYTE_NONE;
1089 break;
1090
1091 case E2271CS021:
1092 epd->border = devm_gpiod_get(dev, "border", GPIOD_OUT_LOW);
1093 if (IS_ERR(epd->border)) {
1094 ret = PTR_ERR(epd->border);
1095 if (ret != -EPROBE_DEFER)
1096 DRM_DEV_ERROR(dev, "Failed to get gpio 'border'\n");
1097 return ret;
1098 }
1099
1100 mode = &repaper_e2271cs021_mode;
1101 epd->channel_select = repaper_e2271cs021_cs;
1102 epd->stage_time = 630;
1103 epd->bytes_per_scan = 176 / 4;
1104 epd->middle_scan = true;
1105 epd->pre_border_byte = true;
1106 epd->border_byte = REPAPER_BORDER_BYTE_NONE;
1107 break;
1108
1109 default:
1110 return -ENODEV;
1111 }
1112
1113 epd->mode = mode;
1114 epd->width = mode->hdisplay;
1115 epd->height = mode->vdisplay;
1116 epd->factored_stage_time = epd->stage_time;
1117
1118 line_buffer_size = 2 * epd->width / 8 + epd->bytes_per_scan + 2;
1119 epd->line_buffer = devm_kzalloc(dev, line_buffer_size, GFP_KERNEL);
1120 if (!epd->line_buffer)
1121 return -ENOMEM;
1122
1123 epd->current_frame = devm_kzalloc(dev, epd->width * epd->height / 8,
1124 GFP_KERNEL);
1125 if (!epd->current_frame)
1126 return -ENOMEM;
1127
1128 drm->mode_config.min_width = mode->hdisplay;
1129 drm->mode_config.max_width = mode->hdisplay;
1130 drm->mode_config.min_height = mode->vdisplay;
1131 drm->mode_config.max_height = mode->vdisplay;
1132
1133 drm_connector_helper_add(&epd->connector, &repaper_connector_hfuncs);
1134 ret = drm_connector_init(drm, &epd->connector, &repaper_connector_funcs,
1135 DRM_MODE_CONNECTOR_SPI);
1136 if (ret)
1137 return ret;
1138
1139 ret = drm_simple_display_pipe_init(drm, &epd->pipe, &repaper_pipe_funcs,
1140 repaper_formats, ARRAY_SIZE(repaper_formats),
1141 NULL, &epd->connector);
1142 if (ret)
1143 return ret;
1144
1145 drm_mode_config_reset(drm);
1146
1147 ret = drm_dev_register(drm, 0);
1148 if (ret)
1149 return ret;
1150
1151 spi_set_drvdata(spi, drm);
1152
1153 DRM_DEBUG_DRIVER("SPI speed: %uMHz\n", spi->max_speed_hz / 1000000);
1154
1155 drm_fbdev_generic_setup(drm, 0);
1156
1157 return 0;
1158}
1159
1160static int repaper_remove(struct spi_device *spi)
1161{
1162 struct drm_device *drm = spi_get_drvdata(spi);
1163
1164 drm_dev_unplug(drm);
1165 drm_atomic_helper_shutdown(drm);
1166
1167 return 0;
1168}
1169
1170static void repaper_shutdown(struct spi_device *spi)
1171{
1172 drm_atomic_helper_shutdown(spi_get_drvdata(spi));
1173}
1174
1175static struct spi_driver repaper_spi_driver = {
1176 .driver = {
1177 .name = "repaper",
1178 .of_match_table = repaper_of_match,
1179 },
1180 .id_table = repaper_id,
1181 .probe = repaper_probe,
1182 .remove = repaper_remove,
1183 .shutdown = repaper_shutdown,
1184};
1185module_spi_driver(repaper_spi_driver);
1186
1187MODULE_DESCRIPTION("Pervasive Displays RePaper DRM driver");
1188MODULE_AUTHOR("Noralf Trønnes");
1189MODULE_LICENSE("GPL");
1190