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WIP FPC-III support
[linux/fpc-iii.git] / drivers / staging / greybus / camera.c
blobb570e13394ac3b14cf1c7f5750f3fc25919f35b7
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Greybus Camera protocol driver.
4 *
5 * Copyright 2015 Google Inc.
6 * Copyright 2015 Linaro Ltd.
7 */
8
9 #include <linux/debugfs.h>
10 #include <linux/fs.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/string.h>
15 #include <linux/uaccess.h>
16 #include <linux/vmalloc.h>
17 #include <linux/greybus.h>
18
19 #include "gb-camera.h"
20 #include "greybus_protocols.h"
21
22 enum gb_camera_debugs_buffer_id {
23 GB_CAMERA_DEBUGFS_BUFFER_CAPABILITIES,
24 GB_CAMERA_DEBUGFS_BUFFER_STREAMS,
25 GB_CAMERA_DEBUGFS_BUFFER_CAPTURE,
26 GB_CAMERA_DEBUGFS_BUFFER_FLUSH,
27 GB_CAMERA_DEBUGFS_BUFFER_MAX,
28 };
29
30 struct gb_camera_debugfs_buffer {
31 char data[PAGE_SIZE];
32 size_t length;
33 };
34
35 enum gb_camera_state {
36 GB_CAMERA_STATE_UNCONFIGURED,
37 GB_CAMERA_STATE_CONFIGURED,
38 };
39
40 /**
41 * struct gb_camera - A Greybus Camera Device
42 * @connection: the greybus connection for camera management
43 * @data_connection: the greybus connection for camera data
44 * @data_cport_id: the data CPort ID on the module side
45 * @mutex: protects the connection and state fields
46 * @state: the current module state
47 * @debugfs: debugfs entries for camera protocol operations testing
48 * @module: Greybus camera module registered to HOST processor.
49 */
50 struct gb_camera {
51 struct gb_bundle *bundle;
52 struct gb_connection *connection;
53 struct gb_connection *data_connection;
54 u16 data_cport_id;
55
56 struct mutex mutex;
57 enum gb_camera_state state;
58
59 struct {
60 struct dentry *root;
61 struct gb_camera_debugfs_buffer *buffers;
62 } debugfs;
63
64 struct gb_camera_module module;
65 };
66
67 struct gb_camera_stream_config {
68 unsigned int width;
69 unsigned int height;
70 unsigned int format;
71 unsigned int vc;
72 unsigned int dt[2];
73 unsigned int max_size;
74 };
75
76 struct gb_camera_fmt_info {
77 enum v4l2_mbus_pixelcode mbus_code;
78 unsigned int gb_format;
79 unsigned int bpp;
80 };
81
82 /* GB format to media code map */
83 static const struct gb_camera_fmt_info gb_fmt_info[] = {
84 {
85 .mbus_code = V4L2_MBUS_FMT_UYVY8_1X16,
86 .gb_format = 0x01,
87 .bpp = 16,
88 },
89 {
90 .mbus_code = V4L2_MBUS_FMT_NV12_1x8,
91 .gb_format = 0x12,
92 .bpp = 12,
93 },
94 {
95 .mbus_code = V4L2_MBUS_FMT_NV21_1x8,
96 .gb_format = 0x13,
97 .bpp = 12,
98 },
99 {
100 .mbus_code = V4L2_MBUS_FMT_YU12_1x8,
101 .gb_format = 0x16,
102 .bpp = 12,
103 },
104 {
105 .mbus_code = V4L2_MBUS_FMT_YV12_1x8,
106 .gb_format = 0x17,
107 .bpp = 12,
108 },
109 {
110 .mbus_code = V4L2_MBUS_FMT_JPEG_1X8,
111 .gb_format = 0x40,
112 .bpp = 0,
113 },
114 {
115 .mbus_code = V4L2_MBUS_FMT_GB_CAM_METADATA_1X8,
116 .gb_format = 0x41,
117 .bpp = 0,
118 },
119 {
120 .mbus_code = V4L2_MBUS_FMT_GB_CAM_DEBUG_DATA_1X8,
121 .gb_format = 0x42,
122 .bpp = 0,
123 },
124 {
125 .mbus_code = V4L2_MBUS_FMT_SBGGR10_1X10,
126 .gb_format = 0x80,
127 .bpp = 10,
128 },
129 {
130 .mbus_code = V4L2_MBUS_FMT_SGBRG10_1X10,
131 .gb_format = 0x81,
132 .bpp = 10,
133 },
134 {
135 .mbus_code = V4L2_MBUS_FMT_SGRBG10_1X10,
136 .gb_format = 0x82,
137 .bpp = 10,
138 },
139 {
140 .mbus_code = V4L2_MBUS_FMT_SRGGB10_1X10,
141 .gb_format = 0x83,
142 .bpp = 10,
143 },
144 {
145 .mbus_code = V4L2_MBUS_FMT_SBGGR12_1X12,
146 .gb_format = 0x84,
147 .bpp = 12,
148 },
149 {
150 .mbus_code = V4L2_MBUS_FMT_SGBRG12_1X12,
151 .gb_format = 0x85,
152 .bpp = 12,
153 },
154 {
155 .mbus_code = V4L2_MBUS_FMT_SGRBG12_1X12,
156 .gb_format = 0x86,
157 .bpp = 12,
158 },
159 {
160 .mbus_code = V4L2_MBUS_FMT_SRGGB12_1X12,
161 .gb_format = 0x87,
162 .bpp = 12,
163 },
164 };
165
166 static const struct gb_camera_fmt_info *gb_camera_get_format_info(u16 gb_fmt)
167 {
168 unsigned int i;
169
170 for (i = 0; i < ARRAY_SIZE(gb_fmt_info); i++) {
171 if (gb_fmt_info[i].gb_format == gb_fmt)
172 return &gb_fmt_info[i];
173 }
174
175 return NULL;
176 }
177
178 #define ES2_APB_CDSI0_CPORT 16
179 #define ES2_APB_CDSI1_CPORT 17
180
181 #define GB_CAMERA_MAX_SETTINGS_SIZE 8192
182
183 #define gcam_dbg(gcam, format...) dev_dbg(&gcam->bundle->dev, format)
184 #define gcam_info(gcam, format...) dev_info(&gcam->bundle->dev, format)
185 #define gcam_err(gcam, format...) dev_err(&gcam->bundle->dev, format)
186
187 static int gb_camera_operation_sync_flags(struct gb_connection *connection,
188 int type, unsigned int flags,
189 void *request, size_t request_size,
190 void *response, size_t *response_size)
191 {
192 struct gb_operation *operation;
193 int ret;
194
195 operation = gb_operation_create_flags(connection, type, request_size,
196 *response_size, flags,
197 GFP_KERNEL);
198 if (!operation)
199 return -ENOMEM;
200
201 if (request_size)
202 memcpy(operation->request->payload, request, request_size);
203
204 ret = gb_operation_request_send_sync(operation);
205 if (ret) {
206 dev_err(&connection->hd->dev,
207 "%s: synchronous operation of type 0x%02x failed: %d\n",
208 connection->name, type, ret);
209 } else {
210 *response_size = operation->response->payload_size;
211
212 if (operation->response->payload_size)
213 memcpy(response, operation->response->payload,
214 operation->response->payload_size);
215 }
216
217 gb_operation_put(operation);
218
219 return ret;
220 }
221
222 static int gb_camera_get_max_pkt_size(struct gb_camera *gcam,
223 struct gb_camera_configure_streams_response *resp)
224 {
225 unsigned int max_pkt_size = 0;
226 unsigned int i;
227
228 for (i = 0; i < resp->num_streams; i++) {
229 struct gb_camera_stream_config_response *cfg = &resp->config[i];
230 const struct gb_camera_fmt_info *fmt_info;
231 unsigned int pkt_size;
232
233 fmt_info = gb_camera_get_format_info(cfg->format);
234 if (!fmt_info) {
235 gcam_err(gcam, "unsupported greybus image format: %d\n",
236 cfg->format);
237 return -EIO;
238 }
239
240 if (fmt_info->bpp == 0) {
241 pkt_size = le32_to_cpu(cfg->max_pkt_size);
242
243 if (pkt_size == 0) {
244 gcam_err(gcam,
245 "Stream %u: invalid zero maximum packet size\n",
246 i);
247 return -EIO;
248 }
249 } else {
250 pkt_size = le16_to_cpu(cfg->width) * fmt_info->bpp / 8;
251
252 if (pkt_size != le32_to_cpu(cfg->max_pkt_size)) {
253 gcam_err(gcam,
254 "Stream %u: maximum packet size mismatch (%u/%u)\n",
255 i, pkt_size, cfg->max_pkt_size);
256 return -EIO;
257 }
258 }
259
260 max_pkt_size = max(pkt_size, max_pkt_size);
261 }
262
263 return max_pkt_size;
264 }
265
266 /*
267 * Validate the stream configuration response verifying padding is correctly
268 * set and the returned number of streams is supported
269 */
270 static const int gb_camera_configure_streams_validate_response(
271 struct gb_camera *gcam,
272 struct gb_camera_configure_streams_response *resp,
273 unsigned int nstreams)
274 {
275 unsigned int i;
276
277 /* Validate the returned response structure */
278 if (resp->padding[0] || resp->padding[1]) {
279 gcam_err(gcam, "response padding != 0\n");
280 return -EIO;
281 }
282
283 if (resp->num_streams > nstreams) {
284 gcam_err(gcam, "got #streams %u > request %u\n",
285 resp->num_streams, nstreams);
286 return -EIO;
287 }
288
289 for (i = 0; i < resp->num_streams; i++) {
290 struct gb_camera_stream_config_response *cfg = &resp->config[i];
291
292 if (cfg->padding) {
293 gcam_err(gcam, "stream #%u padding != 0\n", i);
294 return -EIO;
295 }
296 }
297
298 return 0;
299 }
300
301 /* -----------------------------------------------------------------------------
302 * Hardware Configuration
303 */
304
305 static int gb_camera_set_intf_power_mode(struct gb_camera *gcam, u8 intf_id,
306 bool hs)
307 {
308 struct gb_svc *svc = gcam->connection->hd->svc;
309 int ret;
310
311 if (hs)
312 ret = gb_svc_intf_set_power_mode(svc, intf_id,
313 GB_SVC_UNIPRO_HS_SERIES_A,
314 GB_SVC_UNIPRO_FAST_MODE, 2, 2,
315 GB_SVC_SMALL_AMPLITUDE,
316 GB_SVC_NO_DE_EMPHASIS,
317 GB_SVC_UNIPRO_FAST_MODE, 2, 2,
318 GB_SVC_PWRM_RXTERMINATION |
319 GB_SVC_PWRM_TXTERMINATION, 0,
320 NULL, NULL);
321 else
322 ret = gb_svc_intf_set_power_mode(svc, intf_id,
323 GB_SVC_UNIPRO_HS_SERIES_A,
324 GB_SVC_UNIPRO_SLOW_AUTO_MODE,
325 2, 1,
326 GB_SVC_SMALL_AMPLITUDE,
327 GB_SVC_NO_DE_EMPHASIS,
328 GB_SVC_UNIPRO_SLOW_AUTO_MODE,
329 2, 1,
330 0, 0,
331 NULL, NULL);
332
333 return ret;
334 }
335
336 static int gb_camera_set_power_mode(struct gb_camera *gcam, bool hs)
337 {
338 struct gb_interface *intf = gcam->connection->intf;
339 struct gb_svc *svc = gcam->connection->hd->svc;
340 int ret;
341
342 ret = gb_camera_set_intf_power_mode(gcam, intf->interface_id, hs);
343 if (ret < 0) {
344 gcam_err(gcam, "failed to set module interface to %s (%d)\n",
345 hs ? "HS" : "PWM", ret);
346 return ret;
347 }
348
349 ret = gb_camera_set_intf_power_mode(gcam, svc->ap_intf_id, hs);
350 if (ret < 0) {
351 gb_camera_set_intf_power_mode(gcam, intf->interface_id, !hs);
352 gcam_err(gcam, "failed to set AP interface to %s (%d)\n",
353 hs ? "HS" : "PWM", ret);
354 return ret;
355 }
356
357 return 0;
358 }
359
360 struct ap_csi_config_request {
361 __u8 csi_id;
362 __u8 flags;
363 #define GB_CAMERA_CSI_FLAG_CLOCK_CONTINUOUS 0x01
364 __u8 num_lanes;
365 __u8 padding;
366 __le32 csi_clk_freq;
367 __le32 max_pkt_size;
368 } __packed;
369
370 /*
371 * TODO: Compute the number of lanes dynamically based on bandwidth
372 * requirements.
373 */
374 #define GB_CAMERA_CSI_NUM_DATA_LANES 4
375
376 #define GB_CAMERA_CSI_CLK_FREQ_MAX 999000000U
377 #define GB_CAMERA_CSI_CLK_FREQ_MIN 100000000U
378 #define GB_CAMERA_CSI_CLK_FREQ_MARGIN 150000000U
379
380 static int gb_camera_setup_data_connection(struct gb_camera *gcam,
381 struct gb_camera_configure_streams_response *resp,
382 struct gb_camera_csi_params *csi_params)
383 {
384 struct ap_csi_config_request csi_cfg;
385 struct gb_connection *conn;
386 unsigned int clk_freq;
387 int ret;
388
389 /*
390 * Create the data connection between the camera module data CPort and
391 * APB CDSI1. The CDSI1 CPort ID is hardcoded by the ES2 bridge.
392 */
393 conn = gb_connection_create_offloaded(gcam->bundle, gcam->data_cport_id,
394 GB_CONNECTION_FLAG_NO_FLOWCTRL |
395 GB_CONNECTION_FLAG_CDSI1);
396 if (IS_ERR(conn))
397 return PTR_ERR(conn);
398
399 gcam->data_connection = conn;
400 gb_connection_set_data(conn, gcam);
401
402 ret = gb_connection_enable(conn);
403 if (ret)
404 goto error_conn_destroy;
405
406 /* Set the UniPro link to high speed mode. */
407 ret = gb_camera_set_power_mode(gcam, true);
408 if (ret < 0)
409 goto error_conn_disable;
410
411 /*
412 * Configure the APB-A CSI-2 transmitter.
413 *
414 * Hardcode the number of lanes to 4 and compute the bus clock frequency
415 * based on the module bandwidth requirements with a safety margin.
416 */
417 memset(&csi_cfg, 0, sizeof(csi_cfg));
418 csi_cfg.csi_id = 1;
419 csi_cfg.flags = 0;
420 csi_cfg.num_lanes = GB_CAMERA_CSI_NUM_DATA_LANES;
421
422 clk_freq = resp->data_rate / 2 / GB_CAMERA_CSI_NUM_DATA_LANES;
423 clk_freq = clamp(clk_freq + GB_CAMERA_CSI_CLK_FREQ_MARGIN,
424 GB_CAMERA_CSI_CLK_FREQ_MIN,
425 GB_CAMERA_CSI_CLK_FREQ_MAX);
426 csi_cfg.csi_clk_freq = clk_freq;
427
428 ret = gb_camera_get_max_pkt_size(gcam, resp);
429 if (ret < 0) {
430 ret = -EIO;
431 goto error_power;
432 }
433 csi_cfg.max_pkt_size = ret;
434
435 ret = gb_hd_output(gcam->connection->hd, &csi_cfg,
436 sizeof(csi_cfg),
437 GB_APB_REQUEST_CSI_TX_CONTROL, false);
438 if (ret < 0) {
439 gcam_err(gcam, "failed to start the CSI transmitter\n");
440 goto error_power;
441 }
442
443 if (csi_params) {
444 csi_params->clk_freq = csi_cfg.csi_clk_freq;
445 csi_params->num_lanes = csi_cfg.num_lanes;
446 }
447
448 return 0;
449
450 error_power:
451 gb_camera_set_power_mode(gcam, false);
452 error_conn_disable:
453 gb_connection_disable(gcam->data_connection);
454 error_conn_destroy:
455 gb_connection_destroy(gcam->data_connection);
456 gcam->data_connection = NULL;
457 return ret;
458 }
459
460 static void gb_camera_teardown_data_connection(struct gb_camera *gcam)
461 {
462 struct ap_csi_config_request csi_cfg;
463 int ret;
464
465 /* Stop the APB1 CSI transmitter. */
466 memset(&csi_cfg, 0, sizeof(csi_cfg));
467 csi_cfg.csi_id = 1;
468
469 ret = gb_hd_output(gcam->connection->hd, &csi_cfg,
470 sizeof(csi_cfg),
471 GB_APB_REQUEST_CSI_TX_CONTROL, false);
472
473 if (ret < 0)
474 gcam_err(gcam, "failed to stop the CSI transmitter\n");
475
476 /* Set the UniPro link to low speed mode. */
477 gb_camera_set_power_mode(gcam, false);
478
479 /* Destroy the data connection. */
480 gb_connection_disable(gcam->data_connection);
481 gb_connection_destroy(gcam->data_connection);
482 gcam->data_connection = NULL;
483 }
484
485 /* -----------------------------------------------------------------------------
486 * Camera Protocol Operations
487 */
488
489 static int gb_camera_capabilities(struct gb_camera *gcam,
490 u8 *capabilities, size_t *size)
491 {
492 int ret;
493
494 ret = gb_pm_runtime_get_sync(gcam->bundle);
495 if (ret)
496 return ret;
497
498 mutex_lock(&gcam->mutex);
499
500 if (!gcam->connection) {
501 ret = -EINVAL;
502 goto done;
503 }
504
505 ret = gb_camera_operation_sync_flags(gcam->connection,
506 GB_CAMERA_TYPE_CAPABILITIES,
507 GB_OPERATION_FLAG_SHORT_RESPONSE,
508 NULL, 0,
509 (void *)capabilities, size);
510 if (ret)
511 gcam_err(gcam, "failed to retrieve capabilities: %d\n", ret);
512
513 done:
514 mutex_unlock(&gcam->mutex);
515
516 gb_pm_runtime_put_autosuspend(gcam->bundle);
517
518 return ret;
519 }
520
521 static int gb_camera_configure_streams(struct gb_camera *gcam,
522 unsigned int *num_streams,
523 unsigned int *flags,
524 struct gb_camera_stream_config *streams,
525 struct gb_camera_csi_params *csi_params)
526 {
527 struct gb_camera_configure_streams_request *req;
528 struct gb_camera_configure_streams_response *resp;
529 unsigned int nstreams = *num_streams;
530 unsigned int i;
531 size_t req_size;
532 size_t resp_size;
533 int ret;
534
535 if (nstreams > GB_CAMERA_MAX_STREAMS)
536 return -EINVAL;
537
538 req_size = sizeof(*req) + nstreams * sizeof(req->config[0]);
539 resp_size = sizeof(*resp) + nstreams * sizeof(resp->config[0]);
540
541 req = kmalloc(req_size, GFP_KERNEL);
542 resp = kmalloc(resp_size, GFP_KERNEL);
543 if (!req || !resp) {
544 kfree(req);
545 kfree(resp);
546 return -ENOMEM;
547 }
548
549 req->num_streams = nstreams;
550 req->flags = *flags;
551 req->padding = 0;
552
553 for (i = 0; i < nstreams; ++i) {
554 struct gb_camera_stream_config_request *cfg = &req->config[i];
555
556 cfg->width = cpu_to_le16(streams[i].width);
557 cfg->height = cpu_to_le16(streams[i].height);
558 cfg->format = cpu_to_le16(streams[i].format);
559 cfg->padding = 0;
560 }
561
562 mutex_lock(&gcam->mutex);
563
564 ret = gb_pm_runtime_get_sync(gcam->bundle);
565 if (ret)
566 goto done_skip_pm_put;
567
568 if (!gcam->connection) {
569 ret = -EINVAL;
570 goto done;
571 }
572
573 ret = gb_camera_operation_sync_flags(gcam->connection,
574 GB_CAMERA_TYPE_CONFIGURE_STREAMS,
575 GB_OPERATION_FLAG_SHORT_RESPONSE,
576 req, req_size,
577 resp, &resp_size);
578 if (ret < 0)
579 goto done;
580
581 ret = gb_camera_configure_streams_validate_response(gcam, resp,
582 nstreams);
583 if (ret < 0)
584 goto done;
585
586 *flags = resp->flags;
587 *num_streams = resp->num_streams;
588
589 for (i = 0; i < resp->num_streams; ++i) {
590 struct gb_camera_stream_config_response *cfg = &resp->config[i];
591
592 streams[i].width = le16_to_cpu(cfg->width);
593 streams[i].height = le16_to_cpu(cfg->height);
594 streams[i].format = le16_to_cpu(cfg->format);
595 streams[i].vc = cfg->virtual_channel;
596 streams[i].dt[0] = cfg->data_type[0];
597 streams[i].dt[1] = cfg->data_type[1];
598 streams[i].max_size = le32_to_cpu(cfg->max_size);
599 }
600
601 if ((resp->flags & GB_CAMERA_CONFIGURE_STREAMS_ADJUSTED) ||
602 (req->flags & GB_CAMERA_CONFIGURE_STREAMS_TEST_ONLY))
603 goto done;
604
605 if (gcam->state == GB_CAMERA_STATE_CONFIGURED) {
606 gb_camera_teardown_data_connection(gcam);
607 gcam->state = GB_CAMERA_STATE_UNCONFIGURED;
608
609 /*
610 * When unconfiguring streams release the PM runtime reference
611 * that was acquired when streams were configured. The bundle
612 * won't be suspended until the PM runtime reference acquired at
613 * the beginning of this function gets released right before
614 * returning.
615 */
616 gb_pm_runtime_put_noidle(gcam->bundle);
617 }
618
619 if (resp->num_streams == 0)
620 goto done;
621
622 /*
623 * Make sure the bundle won't be suspended until streams get
624 * unconfigured after the stream is configured successfully
625 */
626 gb_pm_runtime_get_noresume(gcam->bundle);
627
628 /* Setup CSI-2 connection from APB-A to AP */
629 ret = gb_camera_setup_data_connection(gcam, resp, csi_params);
630 if (ret < 0) {
631 memset(req, 0, sizeof(*req));
632 gb_operation_sync(gcam->connection,
633 GB_CAMERA_TYPE_CONFIGURE_STREAMS,
634 req, sizeof(*req),
635 resp, sizeof(*resp));
636 *flags = 0;
637 *num_streams = 0;
638 gb_pm_runtime_put_noidle(gcam->bundle);
639 goto done;
640 }
641
642 gcam->state = GB_CAMERA_STATE_CONFIGURED;
643
644 done:
645 gb_pm_runtime_put_autosuspend(gcam->bundle);
646
647 done_skip_pm_put:
648 mutex_unlock(&gcam->mutex);
649 kfree(req);
650 kfree(resp);
651 return ret;
652 }
653
654 static int gb_camera_capture(struct gb_camera *gcam, u32 request_id,
655 unsigned int streams, unsigned int num_frames,
656 size_t settings_size, const void *settings)
657 {
658 struct gb_camera_capture_request *req;
659 size_t req_size;
660 int ret;
661
662 if (settings_size > GB_CAMERA_MAX_SETTINGS_SIZE)
663 return -EINVAL;
664
665 req_size = sizeof(*req) + settings_size;
666 req = kmalloc(req_size, GFP_KERNEL);
667 if (!req)
668 return -ENOMEM;
669
670 req->request_id = cpu_to_le32(request_id);
671 req->streams = streams;
672 req->padding = 0;
673 req->num_frames = cpu_to_le16(num_frames);
674 memcpy(req->settings, settings, settings_size);
675
676 mutex_lock(&gcam->mutex);
677
678 if (!gcam->connection) {
679 ret = -EINVAL;
680 goto done;
681 }
682
683 ret = gb_operation_sync(gcam->connection, GB_CAMERA_TYPE_CAPTURE,
684 req, req_size, NULL, 0);
685 done:
686 mutex_unlock(&gcam->mutex);
687
688 kfree(req);
689
690 return ret;
691 }
692
693 static int gb_camera_flush(struct gb_camera *gcam, u32 *request_id)
694 {
695 struct gb_camera_flush_response resp;
696 int ret;
697
698 mutex_lock(&gcam->mutex);
699
700 if (!gcam->connection) {
701 ret = -EINVAL;
702 goto done;
703 }
704
705 ret = gb_operation_sync(gcam->connection, GB_CAMERA_TYPE_FLUSH, NULL, 0,
706 &resp, sizeof(resp));
707
708 if (ret < 0)
709 goto done;
710
711 if (request_id)
712 *request_id = le32_to_cpu(resp.request_id);
713
714 done:
715 mutex_unlock(&gcam->mutex);
716
717 return ret;
718 }
719
720 static int gb_camera_request_handler(struct gb_operation *op)
721 {
722 struct gb_camera *gcam = gb_connection_get_data(op->connection);
723 struct gb_camera_metadata_request *payload;
724 struct gb_message *request;
725
726 if (op->type != GB_CAMERA_TYPE_METADATA) {
727 gcam_err(gcam, "Unsupported unsolicited event: %u\n", op->type);
728 return -EINVAL;
729 }
730
731 request = op->request;
732
733 if (request->payload_size < sizeof(*payload)) {
734 gcam_err(gcam, "Wrong event size received (%zu < %zu)\n",
735 request->payload_size, sizeof(*payload));
736 return -EINVAL;
737 }
738
739 payload = request->payload;
740
741 gcam_dbg(gcam, "received metadata for request %u, frame %u, stream %u\n",
742 payload->request_id, payload->frame_number, payload->stream);
743
744 return 0;
745 }
746
747 /* -----------------------------------------------------------------------------
748 * Interface with HOST gmp camera.
749 */
750 static unsigned int gb_camera_mbus_to_gb(enum v4l2_mbus_pixelcode mbus_code)
751 {
752 unsigned int i;
753
754 for (i = 0; i < ARRAY_SIZE(gb_fmt_info); i++) {
755 if (gb_fmt_info[i].mbus_code == mbus_code)
756 return gb_fmt_info[i].gb_format;
757 }
758 return gb_fmt_info[0].gb_format;
759 }
760
761 static enum v4l2_mbus_pixelcode gb_camera_gb_to_mbus(u16 gb_fmt)
762 {
763 unsigned int i;
764
765 for (i = 0; i < ARRAY_SIZE(gb_fmt_info); i++) {
766 if (gb_fmt_info[i].gb_format == gb_fmt)
767 return gb_fmt_info[i].mbus_code;
768 }
769 return gb_fmt_info[0].mbus_code;
770 }
771
772 static ssize_t gb_camera_op_capabilities(void *priv, char *data, size_t len)
773 {
774 struct gb_camera *gcam = priv;
775 size_t capabilities_len = len;
776 int ret;
777
778 ret = gb_camera_capabilities(gcam, data, &capabilities_len);
779 if (ret)
780 return ret;
781
782 return capabilities_len;
783 }
784
785 static int gb_camera_op_configure_streams(void *priv, unsigned int *nstreams,
786 unsigned int *flags, struct gb_camera_stream *streams,
787 struct gb_camera_csi_params *csi_params)
788 {
789 struct gb_camera *gcam = priv;
790 struct gb_camera_stream_config *gb_streams;
791 unsigned int gb_flags = 0;
792 unsigned int gb_nstreams = *nstreams;
793 unsigned int i;
794 int ret;
795
796 if (gb_nstreams > GB_CAMERA_MAX_STREAMS)
797 return -EINVAL;
798
799 gb_streams = kcalloc(gb_nstreams, sizeof(*gb_streams), GFP_KERNEL);
800 if (!gb_streams)
801 return -ENOMEM;
802
803 for (i = 0; i < gb_nstreams; i++) {
804 gb_streams[i].width = streams[i].width;
805 gb_streams[i].height = streams[i].height;
806 gb_streams[i].format =
807 gb_camera_mbus_to_gb(streams[i].pixel_code);
808 }
809
810 if (*flags & GB_CAMERA_IN_FLAG_TEST)
811 gb_flags |= GB_CAMERA_CONFIGURE_STREAMS_TEST_ONLY;
812
813 ret = gb_camera_configure_streams(gcam, &gb_nstreams,
814 &gb_flags, gb_streams, csi_params);
815 if (ret < 0)
816 goto done;
817 if (gb_nstreams > *nstreams) {
818 ret = -EINVAL;
819 goto done;
820 }
821
822 *flags = 0;
823 if (gb_flags & GB_CAMERA_CONFIGURE_STREAMS_ADJUSTED)
824 *flags |= GB_CAMERA_OUT_FLAG_ADJUSTED;
825
826 for (i = 0; i < gb_nstreams; i++) {
827 streams[i].width = gb_streams[i].width;
828 streams[i].height = gb_streams[i].height;
829 streams[i].vc = gb_streams[i].vc;
830 streams[i].dt[0] = gb_streams[i].dt[0];
831 streams[i].dt[1] = gb_streams[i].dt[1];
832 streams[i].max_size = gb_streams[i].max_size;
833 streams[i].pixel_code =
834 gb_camera_gb_to_mbus(gb_streams[i].format);
835 }
836 *nstreams = gb_nstreams;
837
838 done:
839 kfree(gb_streams);
840 return ret;
841 }
842
843 static int gb_camera_op_capture(void *priv, u32 request_id,
844 unsigned int streams, unsigned int num_frames,
845 size_t settings_size, const void *settings)
846 {
847 struct gb_camera *gcam = priv;
848
849 return gb_camera_capture(gcam, request_id, streams, num_frames,
850 settings_size, settings);
851 }
852
853 static int gb_camera_op_flush(void *priv, u32 *request_id)
854 {
855 struct gb_camera *gcam = priv;
856
857 return gb_camera_flush(gcam, request_id);
858 }
859
860 static const struct gb_camera_ops gb_cam_ops = {
861 .capabilities = gb_camera_op_capabilities,
862 .configure_streams = gb_camera_op_configure_streams,
863 .capture = gb_camera_op_capture,
864 .flush = gb_camera_op_flush,
865 };
866
867 /* -----------------------------------------------------------------------------
868 * DebugFS
869 */
870
871 static ssize_t gb_camera_debugfs_capabilities(struct gb_camera *gcam,
872 char *buf, size_t len)
873 {
874 struct gb_camera_debugfs_buffer *buffer =
875 &gcam->debugfs.buffers[GB_CAMERA_DEBUGFS_BUFFER_CAPABILITIES];
876 size_t size = 1024;
877 unsigned int i;
878 u8 *caps;
879 int ret;
880
881 caps = kmalloc(size, GFP_KERNEL);
882 if (!caps)
883 return -ENOMEM;
884
885 ret = gb_camera_capabilities(gcam, caps, &size);
886 if (ret < 0)
887 goto done;
888
889 /*
890 * hex_dump_to_buffer() doesn't return the number of bytes dumped prior
891 * to v4.0, we need our own implementation :-(
892 */
893 buffer->length = 0;
894
895 for (i = 0; i < size; i += 16) {
896 unsigned int nbytes = min_t(unsigned int, size - i, 16);
897
898 buffer->length += sprintf(buffer->data + buffer->length,
899 "%*ph\n", nbytes, caps + i);
900 }
901
902 done:
903 kfree(caps);
904 return ret;
905 }
906
907 static ssize_t gb_camera_debugfs_configure_streams(struct gb_camera *gcam,
908 char *buf, size_t len)
909 {
910 struct gb_camera_debugfs_buffer *buffer =
911 &gcam->debugfs.buffers[GB_CAMERA_DEBUGFS_BUFFER_STREAMS];
912 struct gb_camera_stream_config *streams;
913 unsigned int nstreams;
914 unsigned int flags;
915 unsigned int i;
916 char *token;
917 int ret;
918
919 /* Retrieve number of streams to configure */
920 token = strsep(&buf, ";");
921 if (!token)
922 return -EINVAL;
923
924 ret = kstrtouint(token, 10, &nstreams);
925 if (ret < 0)
926 return ret;
927
928 if (nstreams > GB_CAMERA_MAX_STREAMS)
929 return -EINVAL;
930
931 token = strsep(&buf, ";");
932 if (!token)
933 return -EINVAL;
934
935 ret = kstrtouint(token, 10, &flags);
936 if (ret < 0)
937 return ret;
938
939 /* For each stream to configure parse width, height and format */
940 streams = kcalloc(nstreams, sizeof(*streams), GFP_KERNEL);
941 if (!streams)
942 return -ENOMEM;
943
944 for (i = 0; i < nstreams; ++i) {
945 struct gb_camera_stream_config *stream = &streams[i];
946
947 /* width */
948 token = strsep(&buf, ";");
949 if (!token) {
950 ret = -EINVAL;
951 goto done;
952 }
953 ret = kstrtouint(token, 10, &stream->width);
954 if (ret < 0)
955 goto done;
956
957 /* height */
958 token = strsep(&buf, ";");
959 if (!token)
960 goto done;
961
962 ret = kstrtouint(token, 10, &stream->height);
963 if (ret < 0)
964 goto done;
965
966 /* Image format code */
967 token = strsep(&buf, ";");
968 if (!token)
969 goto done;
970
971 ret = kstrtouint(token, 16, &stream->format);
972 if (ret < 0)
973 goto done;
974 }
975
976 ret = gb_camera_configure_streams(gcam, &nstreams, &flags, streams,
977 NULL);
978 if (ret < 0)
979 goto done;
980
981 buffer->length = sprintf(buffer->data, "%u;%u;", nstreams, flags);
982
983 for (i = 0; i < nstreams; ++i) {
984 struct gb_camera_stream_config *stream = &streams[i];
985
986 buffer->length += sprintf(buffer->data + buffer->length,
987 "%u;%u;%u;%u;%u;%u;%u;",
988 stream->width, stream->height,
989 stream->format, stream->vc,
990 stream->dt[0], stream->dt[1],
991 stream->max_size);
992 }
993
994 ret = len;
995
996 done:
997 kfree(streams);
998 return ret;
999 };
1000
1001 static ssize_t gb_camera_debugfs_capture(struct gb_camera *gcam,
1002 char *buf, size_t len)
1003 {
1004 unsigned int request_id;
1005 unsigned int streams_mask;
1006 unsigned int num_frames;
1007 char *token;
1008 int ret;
1009
1010 /* Request id */
1011 token = strsep(&buf, ";");
1012 if (!token)
1013 return -EINVAL;
1014 ret = kstrtouint(token, 10, &request_id);
1015 if (ret < 0)
1016 return ret;
1017
1018 /* Stream mask */
1019 token = strsep(&buf, ";");
1020 if (!token)
1021 return -EINVAL;
1022 ret = kstrtouint(token, 16, &streams_mask);
1023 if (ret < 0)
1024 return ret;
1025
1026 /* number of frames */
1027 token = strsep(&buf, ";");
1028 if (!token)
1029 return -EINVAL;
1030 ret = kstrtouint(token, 10, &num_frames);
1031 if (ret < 0)
1032 return ret;
1033
1034 ret = gb_camera_capture(gcam, request_id, streams_mask, num_frames, 0,
1035 NULL);
1036 if (ret < 0)
1037 return ret;
1038
1039 return len;
1040 }
1041
1042 static ssize_t gb_camera_debugfs_flush(struct gb_camera *gcam,
1043 char *buf, size_t len)
1044 {
1045 struct gb_camera_debugfs_buffer *buffer =
1046 &gcam->debugfs.buffers[GB_CAMERA_DEBUGFS_BUFFER_FLUSH];
1047 unsigned int req_id;
1048 int ret;
1049
1050 ret = gb_camera_flush(gcam, &req_id);
1051 if (ret < 0)
1052 return ret;
1053
1054 buffer->length = sprintf(buffer->data, "%u", req_id);
1055
1056 return len;
1057 }
1058
1059 struct gb_camera_debugfs_entry {
1060 const char *name;
1061 unsigned int mask;
1062 unsigned int buffer;
1063 ssize_t (*execute)(struct gb_camera *gcam, char *buf, size_t len);
1064 };
1065
1066 static const struct gb_camera_debugfs_entry gb_camera_debugfs_entries[] = {
1067 {
1068 .name = "capabilities",
1069 .mask = S_IFREG | 0444,
1070 .buffer = GB_CAMERA_DEBUGFS_BUFFER_CAPABILITIES,
1071 .execute = gb_camera_debugfs_capabilities,
1072 }, {
1073 .name = "configure_streams",
1074 .mask = S_IFREG | 0666,
1075 .buffer = GB_CAMERA_DEBUGFS_BUFFER_STREAMS,
1076 .execute = gb_camera_debugfs_configure_streams,
1077 }, {
1078 .name = "capture",
1079 .mask = S_IFREG | 0666,
1080 .buffer = GB_CAMERA_DEBUGFS_BUFFER_CAPTURE,
1081 .execute = gb_camera_debugfs_capture,
1082 }, {
1083 .name = "flush",
1084 .mask = S_IFREG | 0666,
1085 .buffer = GB_CAMERA_DEBUGFS_BUFFER_FLUSH,
1086 .execute = gb_camera_debugfs_flush,
1087 },
1088 };
1089
1090 static ssize_t gb_camera_debugfs_read(struct file *file, char __user *buf,
1091 size_t len, loff_t *offset)
1092 {
1093 const struct gb_camera_debugfs_entry *op = file->private_data;
1094 struct gb_camera *gcam = file_inode(file)->i_private;
1095 struct gb_camera_debugfs_buffer *buffer;
1096 ssize_t ret;
1097
1098 /* For read-only entries the operation is triggered by a read. */
1099 if (!(op->mask & 0222)) {
1100 ret = op->execute(gcam, NULL, 0);
1101 if (ret < 0)
1102 return ret;
1103 }
1104
1105 buffer = &gcam->debugfs.buffers[op->buffer];
1106
1107 return simple_read_from_buffer(buf, len, offset, buffer->data,
1108 buffer->length);
1109 }
1110
1111 static ssize_t gb_camera_debugfs_write(struct file *file,
1112 const char __user *buf, size_t len,
1113 loff_t *offset)
1114 {
1115 const struct gb_camera_debugfs_entry *op = file->private_data;
1116 struct gb_camera *gcam = file_inode(file)->i_private;
1117 ssize_t ret;
1118 char *kbuf;
1119
1120 if (len > 1024)
1121 return -EINVAL;
1122
1123 kbuf = kmalloc(len + 1, GFP_KERNEL);
1124 if (!kbuf)
1125 return -ENOMEM;
1126
1127 if (copy_from_user(kbuf, buf, len)) {
1128 ret = -EFAULT;
1129 goto done;
1130 }
1131
1132 kbuf[len] = '\0';
1133
1134 ret = op->execute(gcam, kbuf, len);
1135
1136 done:
1137 kfree(kbuf);
1138 return ret;
1139 }
1140
1141 static int gb_camera_debugfs_open(struct inode *inode, struct file *file)
1142 {
1143 unsigned int i;
1144
1145 for (i = 0; i < ARRAY_SIZE(gb_camera_debugfs_entries); ++i) {
1146 const struct gb_camera_debugfs_entry *entry =
1147 &gb_camera_debugfs_entries[i];
1148
1149 if (!strcmp(file->f_path.dentry->d_iname, entry->name)) {
1150 file->private_data = (void *)entry;
1151 break;
1152 }
1153 }
1154
1155 return 0;
1156 }
1157
1158 static const struct file_operations gb_camera_debugfs_ops = {
1159 .open = gb_camera_debugfs_open,
1160 .read = gb_camera_debugfs_read,
1161 .write = gb_camera_debugfs_write,
1162 };
1163
1164 static int gb_camera_debugfs_init(struct gb_camera *gcam)
1165 {
1166 struct gb_connection *connection = gcam->connection;
1167 char dirname[27];
1168 unsigned int i;
1169
1170 /*
1171 * Create root debugfs entry and a file entry for each camera operation.
1172 */
1173 snprintf(dirname, 27, "camera-%u.%u", connection->intf->interface_id,
1174 gcam->bundle->id);
1175
1176 gcam->debugfs.root = debugfs_create_dir(dirname, gb_debugfs_get());
1177
1178 gcam->debugfs.buffers =
1179 vmalloc(array_size(GB_CAMERA_DEBUGFS_BUFFER_MAX,
1180 sizeof(*gcam->debugfs.buffers)));
1181 if (!gcam->debugfs.buffers)
1182 return -ENOMEM;
1183
1184 for (i = 0; i < ARRAY_SIZE(gb_camera_debugfs_entries); ++i) {
1185 const struct gb_camera_debugfs_entry *entry =
1186 &gb_camera_debugfs_entries[i];
1187
1188 gcam->debugfs.buffers[i].length = 0;
1189
1190 debugfs_create_file(entry->name, entry->mask,
1191 gcam->debugfs.root, gcam,
1192 &gb_camera_debugfs_ops);
1193 }
1194
1195 return 0;
1196 }
1197
1198 static void gb_camera_debugfs_cleanup(struct gb_camera *gcam)
1199 {
1200 debugfs_remove_recursive(gcam->debugfs.root);
1201
1202 vfree(gcam->debugfs.buffers);
1203 }
1204
1205 /* -----------------------------------------------------------------------------
1206 * Init & Cleanup
1207 */
1208
1209 static void gb_camera_cleanup(struct gb_camera *gcam)
1210 {
1211 gb_camera_debugfs_cleanup(gcam);
1212
1213 mutex_lock(&gcam->mutex);
1214 if (gcam->data_connection) {
1215 gb_connection_disable(gcam->data_connection);
1216 gb_connection_destroy(gcam->data_connection);
1217 gcam->data_connection = NULL;
1218 }
1219
1220 if (gcam->connection) {
1221 gb_connection_disable(gcam->connection);
1222 gb_connection_destroy(gcam->connection);
1223 gcam->connection = NULL;
1224 }
1225 mutex_unlock(&gcam->mutex);
1226 }
1227
1228 static void gb_camera_release_module(struct kref *ref)
1229 {
1230 struct gb_camera_module *cam_mod =
1231 container_of(ref, struct gb_camera_module, refcount);
1232 kfree(cam_mod->priv);
1233 }
1234
1235 static int gb_camera_probe(struct gb_bundle *bundle,
1236 const struct greybus_bundle_id *id)
1237 {
1238 struct gb_connection *conn;
1239 struct gb_camera *gcam;
1240 u16 mgmt_cport_id = 0;
1241 u16 data_cport_id = 0;
1242 unsigned int i;
1243 int ret;
1244
1245 /*
1246 * The camera bundle must contain exactly two CPorts, one for the
1247 * camera management protocol and one for the camera data protocol.
1248 */
1249 if (bundle->num_cports != 2)
1250 return -ENODEV;
1251
1252 for (i = 0; i < bundle->num_cports; ++i) {
1253 struct greybus_descriptor_cport *desc = &bundle->cport_desc[i];
1254
1255 switch (desc->protocol_id) {
1256 case GREYBUS_PROTOCOL_CAMERA_MGMT:
1257 mgmt_cport_id = le16_to_cpu(desc->id);
1258 break;
1259 case GREYBUS_PROTOCOL_CAMERA_DATA:
1260 data_cport_id = le16_to_cpu(desc->id);
1261 break;
1262 default:
1263 return -ENODEV;
1264 }
1265 }
1266
1267 if (!mgmt_cport_id || !data_cport_id)
1268 return -ENODEV;
1269
1270 gcam = kzalloc(sizeof(*gcam), GFP_KERNEL);
1271 if (!gcam)
1272 return -ENOMEM;
1273
1274 mutex_init(&gcam->mutex);
1275
1276 gcam->bundle = bundle;
1277 gcam->state = GB_CAMERA_STATE_UNCONFIGURED;
1278 gcam->data_cport_id = data_cport_id;
1279
1280 conn = gb_connection_create(bundle, mgmt_cport_id,
1281 gb_camera_request_handler);
1282 if (IS_ERR(conn)) {
1283 ret = PTR_ERR(conn);
1284 goto error;
1285 }
1286
1287 gcam->connection = conn;
1288 gb_connection_set_data(conn, gcam);
1289
1290 ret = gb_connection_enable(conn);
1291 if (ret)
1292 goto error;
1293
1294 ret = gb_camera_debugfs_init(gcam);
1295 if (ret < 0)
1296 goto error;
1297
1298 gcam->module.priv = gcam;
1299 gcam->module.ops = &gb_cam_ops;
1300 gcam->module.interface_id = gcam->connection->intf->interface_id;
1301 gcam->module.release = gb_camera_release_module;
1302 ret = gb_camera_register(&gcam->module);
1303 if (ret < 0)
1304 goto error;
1305
1306 greybus_set_drvdata(bundle, gcam);
1307
1308 gb_pm_runtime_put_autosuspend(gcam->bundle);
1309
1310 return 0;
1311
1312 error:
1313 gb_camera_cleanup(gcam);
1314 kfree(gcam);
1315 return ret;
1316 }
1317
1318 static void gb_camera_disconnect(struct gb_bundle *bundle)
1319 {
1320 struct gb_camera *gcam = greybus_get_drvdata(bundle);
1321 int ret;
1322
1323 ret = gb_pm_runtime_get_sync(bundle);
1324 if (ret)
1325 gb_pm_runtime_get_noresume(bundle);
1326
1327 gb_camera_cleanup(gcam);
1328 gb_camera_unregister(&gcam->module);
1329 }
1330
1331 static const struct greybus_bundle_id gb_camera_id_table[] = {
1332 { GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_CAMERA) },
1333 { },
1334 };
1335
1336 #ifdef CONFIG_PM
1337 static int gb_camera_suspend(struct device *dev)
1338 {
1339 struct gb_bundle *bundle = to_gb_bundle(dev);
1340 struct gb_camera *gcam = greybus_get_drvdata(bundle);
1341
1342 if (gcam->data_connection)
1343 gb_connection_disable(gcam->data_connection);
1344
1345 gb_connection_disable(gcam->connection);
1346
1347 return 0;
1348 }
1349
1350 static int gb_camera_resume(struct device *dev)
1351 {
1352 struct gb_bundle *bundle = to_gb_bundle(dev);
1353 struct gb_camera *gcam = greybus_get_drvdata(bundle);
1354 int ret;
1355
1356 ret = gb_connection_enable(gcam->connection);
1357 if (ret) {
1358 gcam_err(gcam, "failed to enable connection: %d\n", ret);
1359 return ret;
1360 }
1361
1362 if (gcam->data_connection) {
1363 ret = gb_connection_enable(gcam->data_connection);
1364 if (ret) {
1365 gcam_err(gcam,
1366 "failed to enable data connection: %d\n", ret);
1367 return ret;
1368 }
1369 }
1370
1371 return 0;
1372 }
1373 #endif
1374
1375 static const struct dev_pm_ops gb_camera_pm_ops = {
1376 SET_RUNTIME_PM_OPS(gb_camera_suspend, gb_camera_resume, NULL)
1377 };
1378
1379 static struct greybus_driver gb_camera_driver = {
1380 .name = "camera",
1381 .probe = gb_camera_probe,
1382 .disconnect = gb_camera_disconnect,
1383 .id_table = gb_camera_id_table,
1384 .driver.pm = &gb_camera_pm_ops,
1385 };
1386
1387 module_greybus_driver(gb_camera_driver);
1388
1389 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support