1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2023 Intel Corporation. All rights reserved.
4 * Intel Visual Sensing Controller CSI Linux driver
5 */
6
7 /*
8 * To set ownership of CSI-2 link and to configure CSI-2 link, there
9 * are specific commands, which are sent via MEI protocol. The send
10 * command function uses "completion" as a synchronization mechanism.
11 * The response for command is received via a mei callback which wakes
12 * up the caller. There can be only one outstanding command at a time.
13 */
14
15 #include <linux/completion.h>
16 #include <linux/delay.h>
17 #include <linux/kernel.h>
18 #include <linux/math64.h>
19 #include <linux/mei_cl_bus.h>
20 #include <linux/module.h>
21 #include <linux/mutex.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/slab.h>
24 #include <linux/units.h>
25 #include <linux/uuid.h>
26 #include <linux/workqueue.h>
27
28 #include <media/v4l2-async.h>
29 #include <media/v4l2-ctrls.h>
30 #include <media/v4l2-fwnode.h>
31 #include <media/v4l2-subdev.h>
32
33 #define MEI_CSI_DRIVER_NAME "ivsc_csi"
34 #define MEI_CSI_ENTITY_NAME "Intel IVSC CSI"
35
36 #define MEI_CSI_LINK_FREQ_400MHZ 400000000ULL
37
38 /* the 5s used here is based on experiment */
39 #define CSI_CMD_TIMEOUT (5 * HZ)
40 /* to setup CSI-2 link an extra delay needed and determined experimentally */
41 #define CSI_FW_READY_DELAY_MS 100
42 /* link frequency unit is 100kHz */
43 #define CSI_LINK_FREQ(x) ((u32)(div_u64(x, 100 * HZ_PER_KHZ)))
44
45 /*
46 * identify the command id supported by firmware
47 * IPC, as well as the privacy notification id
48 * used when processing privacy event.
49 */
50 enum csi_cmd_id {
51 /* used to set csi ownership */
52 CSI_SET_OWNER = 0,
53
54 /* used to configure CSI-2 link */
55 CSI_SET_CONF = 2,
56
57 /* privacy notification id used when privacy state changes */
58 CSI_PRIVACY_NOTIF = 6,
59 };
60
61 /* CSI-2 link ownership definition */
62 enum csi_link_owner {
63 CSI_LINK_IVSC,
64 CSI_LINK_HOST,
65 };
66
67 /* privacy status definition */
68 enum ivsc_privacy_status {
69 CSI_PRIVACY_OFF,
70 CSI_PRIVACY_ON,
71 CSI_PRIVACY_MAX,
72 };
73
74 enum csi_pads {
75 CSI_PAD_SINK,
76 CSI_PAD_SOURCE,
77 CSI_NUM_PADS
78 };
79
80 /* configuration of the CSI-2 link between host and IVSC */
81 struct csi_link_cfg {
82 /* number of data lanes used on the CSI-2 link */
83 u32 nr_of_lanes;
84
85 /* frequency of the CSI-2 link */
86 u32 link_freq;
87
88 /* for future use */
89 u32 rsvd[2];
90 } __packed;
91
92 /* CSI command structure */
93 struct csi_cmd {
94 u32 cmd_id;
95 union _cmd_param {
96 u32 param;
97 struct csi_link_cfg conf;
98 } param;
99 } __packed;
100
101 /* CSI notification structure */
102 struct csi_notif {
103 u32 cmd_id;
104 int status;
105 union _resp_cont {
106 u32 cont;
107 struct csi_link_cfg conf;
108 } cont;
109 } __packed;
110
111 struct mei_csi {
112 struct mei_cl_device *cldev;
113
114 /* command response */
115 struct csi_notif cmd_response;
116 /* used to wait for command response from firmware */
117 struct completion cmd_completion;
118 /* protect command download */
119 struct mutex lock;
120
121 struct v4l2_subdev subdev;
122 struct v4l2_subdev *remote;
123 struct v4l2_async_notifier notifier;
124 struct v4l2_ctrl_handler ctrl_handler;
125 struct v4l2_ctrl *freq_ctrl;
126 struct v4l2_ctrl *privacy_ctrl;
127 unsigned int remote_pad;
128 /* start streaming or not */
129 int streaming;
130
131 struct media_pad pads[CSI_NUM_PADS];
132 struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
133
134 /* number of data lanes used on the CSI-2 link */
135 u32 nr_of_lanes;
136 /* frequency of the CSI-2 link */
137 u64 link_freq;
138
139 /* privacy status */
140 enum ivsc_privacy_status status;
141 };
142
143 static const struct v4l2_mbus_framefmt mei_csi_format_mbus_default = {
144 .width = 1,
145 .height = 1,
146 .code = MEDIA_BUS_FMT_Y8_1X8,
147 .field = V4L2_FIELD_NONE,
148 };
149
150 static s64 link_freq_menu_items[] = {
151 MEI_CSI_LINK_FREQ_400MHZ
152 };
153
notifier_to_csi(struct v4l2_async_notifier * n)154 static inline struct mei_csi *notifier_to_csi(struct v4l2_async_notifier *n)
155 {
156 return container_of(n, struct mei_csi, notifier);
157 }
158
sd_to_csi(struct v4l2_subdev * sd)159 static inline struct mei_csi *sd_to_csi(struct v4l2_subdev *sd)
160 {
161 return container_of(sd, struct mei_csi, subdev);
162 }
163
ctrl_to_csi(struct v4l2_ctrl * ctrl)164 static inline struct mei_csi *ctrl_to_csi(struct v4l2_ctrl *ctrl)
165 {
166 return container_of(ctrl->handler, struct mei_csi, ctrl_handler);
167 }
168
169 /* send a command to firmware and mutex must be held by caller */
mei_csi_send(struct mei_csi * csi,u8 * buf,size_t len)170 static int mei_csi_send(struct mei_csi *csi, u8 *buf, size_t len)
171 {
172 struct csi_cmd *cmd = (struct csi_cmd *)buf;
173 int ret;
174
175 reinit_completion(&csi->cmd_completion);
176
177 ret = mei_cldev_send(csi->cldev, buf, len);
178 if (ret < 0)
179 goto out;
180
181 ret = wait_for_completion_killable_timeout(&csi->cmd_completion,
182 CSI_CMD_TIMEOUT);
183 if (ret < 0) {
184 goto out;
185 } else if (!ret) {
186 ret = -ETIMEDOUT;
187 goto out;
188 }
189
190 /* command response status */
191 ret = csi->cmd_response.status;
192 if (ret) {
193 ret = -EINVAL;
194 goto out;
195 }
196
197 if (csi->cmd_response.cmd_id != cmd->cmd_id)
198 ret = -EINVAL;
199
200 out:
201 return ret;
202 }
203
204 /* set CSI-2 link ownership */
csi_set_link_owner(struct mei_csi * csi,enum csi_link_owner owner)205 static int csi_set_link_owner(struct mei_csi *csi, enum csi_link_owner owner)
206 {
207 struct csi_cmd cmd = { 0 };
208 size_t cmd_size;
209 int ret;
210
211 cmd.cmd_id = CSI_SET_OWNER;
212 cmd.param.param = owner;
213 cmd_size = sizeof(cmd.cmd_id) + sizeof(cmd.param.param);
214
215 mutex_lock(&csi->lock);
216
217 ret = mei_csi_send(csi, (u8 *)&cmd, cmd_size);
218
219 mutex_unlock(&csi->lock);
220
221 return ret;
222 }
223
224 /* configure CSI-2 link between host and IVSC */
csi_set_link_cfg(struct mei_csi * csi)225 static int csi_set_link_cfg(struct mei_csi *csi)
226 {
227 struct csi_cmd cmd = { 0 };
228 size_t cmd_size;
229 int ret;
230
231 cmd.cmd_id = CSI_SET_CONF;
232 cmd.param.conf.nr_of_lanes = csi->nr_of_lanes;
233 cmd.param.conf.link_freq = CSI_LINK_FREQ(csi->link_freq);
234 cmd_size = sizeof(cmd.cmd_id) + sizeof(cmd.param.conf);
235
236 mutex_lock(&csi->lock);
237
238 ret = mei_csi_send(csi, (u8 *)&cmd, cmd_size);
239 /*
240 * wait configuration ready if download success. placing
241 * delay under mutex is to make sure current command flow
242 * completed before starting a possible new one.
243 */
244 if (!ret)
245 msleep(CSI_FW_READY_DELAY_MS);
246
247 mutex_unlock(&csi->lock);
248
249 return ret;
250 }
251
252 /* callback for receive */
mei_csi_rx(struct mei_cl_device * cldev)253 static void mei_csi_rx(struct mei_cl_device *cldev)
254 {
255 struct mei_csi *csi = mei_cldev_get_drvdata(cldev);
256 struct csi_notif notif = { 0 };
257 int ret;
258
259 ret = mei_cldev_recv(cldev, (u8 *)¬if, sizeof(notif));
260 if (ret < 0) {
261 dev_err(&cldev->dev, "recv error: %d\n", ret);
262 return;
263 }
264
265 switch (notif.cmd_id) {
266 case CSI_PRIVACY_NOTIF:
267 if (notif.cont.cont < CSI_PRIVACY_MAX) {
268 csi->status = notif.cont.cont;
269 v4l2_ctrl_s_ctrl(csi->privacy_ctrl, csi->status);
270 }
271 break;
272 case CSI_SET_OWNER:
273 case CSI_SET_CONF:
274 memcpy(&csi->cmd_response, ¬if, ret);
275
276 complete(&csi->cmd_completion);
277 break;
278 default:
279 break;
280 }
281 }
282
mei_csi_set_stream(struct v4l2_subdev * sd,int enable)283 static int mei_csi_set_stream(struct v4l2_subdev *sd, int enable)
284 {
285 struct mei_csi *csi = sd_to_csi(sd);
286 s64 freq;
287 int ret;
288
289 if (enable && csi->streaming == 0) {
290 freq = v4l2_get_link_freq(csi->remote->ctrl_handler, 0, 0);
291 if (freq < 0) {
292 dev_err(&csi->cldev->dev,
293 "error %lld, invalid link_freq\n", freq);
294 ret = freq;
295 goto err;
296 }
297 csi->link_freq = freq;
298
299 /* switch CSI-2 link to host */
300 ret = csi_set_link_owner(csi, CSI_LINK_HOST);
301 if (ret < 0)
302 goto err;
303
304 /* configure CSI-2 link */
305 ret = csi_set_link_cfg(csi);
306 if (ret < 0)
307 goto err_switch;
308
309 ret = v4l2_subdev_call(csi->remote, video, s_stream, 1);
310 if (ret)
311 goto err_switch;
312 } else if (!enable && csi->streaming == 1) {
313 v4l2_subdev_call(csi->remote, video, s_stream, 0);
314
315 /* switch CSI-2 link to IVSC */
316 ret = csi_set_link_owner(csi, CSI_LINK_IVSC);
317 if (ret < 0)
318 dev_warn(&csi->cldev->dev,
319 "failed to switch CSI2 link: %d\n", ret);
320 }
321
322 csi->streaming = enable;
323
324 return 0;
325
326 err_switch:
327 csi_set_link_owner(csi, CSI_LINK_IVSC);
328
329 err:
330 return ret;
331 }
332
333 static struct v4l2_mbus_framefmt *
mei_csi_get_pad_format(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,unsigned int pad,u32 which)334 mei_csi_get_pad_format(struct v4l2_subdev *sd,
335 struct v4l2_subdev_state *sd_state,
336 unsigned int pad, u32 which)
337 {
338 struct mei_csi *csi = sd_to_csi(sd);
339
340 switch (which) {
341 case V4L2_SUBDEV_FORMAT_TRY:
342 return v4l2_subdev_get_try_format(sd, sd_state, pad);
343 case V4L2_SUBDEV_FORMAT_ACTIVE:
344 return &csi->format_mbus[pad];
345 default:
346 return NULL;
347 }
348 }
349
mei_csi_init_cfg(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state)350 static int mei_csi_init_cfg(struct v4l2_subdev *sd,
351 struct v4l2_subdev_state *sd_state)
352 {
353 struct v4l2_mbus_framefmt *mbusformat;
354 struct mei_csi *csi = sd_to_csi(sd);
355 unsigned int i;
356
357 mutex_lock(&csi->lock);
358
359 for (i = 0; i < sd->entity.num_pads; i++) {
360 mbusformat = v4l2_subdev_get_try_format(sd, sd_state, i);
361 *mbusformat = mei_csi_format_mbus_default;
362 }
363
364 mutex_unlock(&csi->lock);
365
366 return 0;
367 }
368
mei_csi_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)369 static int mei_csi_get_fmt(struct v4l2_subdev *sd,
370 struct v4l2_subdev_state *sd_state,
371 struct v4l2_subdev_format *format)
372 {
373 struct v4l2_mbus_framefmt *mbusformat;
374 struct mei_csi *csi = sd_to_csi(sd);
375
376 mutex_lock(&csi->lock);
377
378 mbusformat = mei_csi_get_pad_format(sd, sd_state, format->pad,
379 format->which);
380 if (mbusformat)
381 format->format = *mbusformat;
382
383 mutex_unlock(&csi->lock);
384
385 return 0;
386 }
387
mei_csi_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)388 static int mei_csi_set_fmt(struct v4l2_subdev *sd,
389 struct v4l2_subdev_state *sd_state,
390 struct v4l2_subdev_format *format)
391 {
392 struct v4l2_mbus_framefmt *source_mbusformat;
393 struct v4l2_mbus_framefmt *mbusformat;
394 struct mei_csi *csi = sd_to_csi(sd);
395 struct media_pad *pad;
396
397 mbusformat = mei_csi_get_pad_format(sd, sd_state, format->pad,
398 format->which);
399 if (!mbusformat)
400 return -EINVAL;
401
402 source_mbusformat = mei_csi_get_pad_format(sd, sd_state, CSI_PAD_SOURCE,
403 format->which);
404 if (!source_mbusformat)
405 return -EINVAL;
406
407 v4l_bound_align_image(&format->format.width, 1, 65536, 0,
408 &format->format.height, 1, 65536, 0, 0);
409
410 switch (format->format.code) {
411 case MEDIA_BUS_FMT_RGB444_1X12:
412 case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:
413 case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:
414 case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
415 case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
416 case MEDIA_BUS_FMT_RGB565_1X16:
417 case MEDIA_BUS_FMT_BGR565_2X8_BE:
418 case MEDIA_BUS_FMT_BGR565_2X8_LE:
419 case MEDIA_BUS_FMT_RGB565_2X8_BE:
420 case MEDIA_BUS_FMT_RGB565_2X8_LE:
421 case MEDIA_BUS_FMT_RGB666_1X18:
422 case MEDIA_BUS_FMT_RBG888_1X24:
423 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
424 case MEDIA_BUS_FMT_BGR888_1X24:
425 case MEDIA_BUS_FMT_GBR888_1X24:
426 case MEDIA_BUS_FMT_RGB888_1X24:
427 case MEDIA_BUS_FMT_RGB888_2X12_BE:
428 case MEDIA_BUS_FMT_RGB888_2X12_LE:
429 case MEDIA_BUS_FMT_ARGB8888_1X32:
430 case MEDIA_BUS_FMT_RGB888_1X32_PADHI:
431 case MEDIA_BUS_FMT_RGB101010_1X30:
432 case MEDIA_BUS_FMT_RGB121212_1X36:
433 case MEDIA_BUS_FMT_RGB161616_1X48:
434 case MEDIA_BUS_FMT_Y8_1X8:
435 case MEDIA_BUS_FMT_UV8_1X8:
436 case MEDIA_BUS_FMT_UYVY8_1_5X8:
437 case MEDIA_BUS_FMT_VYUY8_1_5X8:
438 case MEDIA_BUS_FMT_YUYV8_1_5X8:
439 case MEDIA_BUS_FMT_YVYU8_1_5X8:
440 case MEDIA_BUS_FMT_UYVY8_2X8:
441 case MEDIA_BUS_FMT_VYUY8_2X8:
442 case MEDIA_BUS_FMT_YUYV8_2X8:
443 case MEDIA_BUS_FMT_YVYU8_2X8:
444 case MEDIA_BUS_FMT_Y10_1X10:
445 case MEDIA_BUS_FMT_UYVY10_2X10:
446 case MEDIA_BUS_FMT_VYUY10_2X10:
447 case MEDIA_BUS_FMT_YUYV10_2X10:
448 case MEDIA_BUS_FMT_YVYU10_2X10:
449 case MEDIA_BUS_FMT_Y12_1X12:
450 case MEDIA_BUS_FMT_UYVY12_2X12:
451 case MEDIA_BUS_FMT_VYUY12_2X12:
452 case MEDIA_BUS_FMT_YUYV12_2X12:
453 case MEDIA_BUS_FMT_YVYU12_2X12:
454 case MEDIA_BUS_FMT_UYVY8_1X16:
455 case MEDIA_BUS_FMT_VYUY8_1X16:
456 case MEDIA_BUS_FMT_YUYV8_1X16:
457 case MEDIA_BUS_FMT_YVYU8_1X16:
458 case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
459 case MEDIA_BUS_FMT_UYVY10_1X20:
460 case MEDIA_BUS_FMT_VYUY10_1X20:
461 case MEDIA_BUS_FMT_YUYV10_1X20:
462 case MEDIA_BUS_FMT_YVYU10_1X20:
463 case MEDIA_BUS_FMT_VUY8_1X24:
464 case MEDIA_BUS_FMT_YUV8_1X24:
465 case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
466 case MEDIA_BUS_FMT_UYVY12_1X24:
467 case MEDIA_BUS_FMT_VYUY12_1X24:
468 case MEDIA_BUS_FMT_YUYV12_1X24:
469 case MEDIA_BUS_FMT_YVYU12_1X24:
470 case MEDIA_BUS_FMT_YUV10_1X30:
471 case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
472 case MEDIA_BUS_FMT_AYUV8_1X32:
473 case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
474 case MEDIA_BUS_FMT_YUV12_1X36:
475 case MEDIA_BUS_FMT_YUV16_1X48:
476 case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
477 case MEDIA_BUS_FMT_JPEG_1X8:
478 case MEDIA_BUS_FMT_AHSV8888_1X32:
479 case MEDIA_BUS_FMT_SBGGR8_1X8:
480 case MEDIA_BUS_FMT_SGBRG8_1X8:
481 case MEDIA_BUS_FMT_SGRBG8_1X8:
482 case MEDIA_BUS_FMT_SRGGB8_1X8:
483 case MEDIA_BUS_FMT_SBGGR10_1X10:
484 case MEDIA_BUS_FMT_SGBRG10_1X10:
485 case MEDIA_BUS_FMT_SGRBG10_1X10:
486 case MEDIA_BUS_FMT_SRGGB10_1X10:
487 case MEDIA_BUS_FMT_SBGGR12_1X12:
488 case MEDIA_BUS_FMT_SGBRG12_1X12:
489 case MEDIA_BUS_FMT_SGRBG12_1X12:
490 case MEDIA_BUS_FMT_SRGGB12_1X12:
491 case MEDIA_BUS_FMT_SBGGR14_1X14:
492 case MEDIA_BUS_FMT_SGBRG14_1X14:
493 case MEDIA_BUS_FMT_SGRBG14_1X14:
494 case MEDIA_BUS_FMT_SRGGB14_1X14:
495 case MEDIA_BUS_FMT_SBGGR16_1X16:
496 case MEDIA_BUS_FMT_SGBRG16_1X16:
497 case MEDIA_BUS_FMT_SGRBG16_1X16:
498 case MEDIA_BUS_FMT_SRGGB16_1X16:
499 break;
500 default:
501 format->format.code = MEDIA_BUS_FMT_Y8_1X8;
502 break;
503 }
504
505 if (format->format.field == V4L2_FIELD_ANY)
506 format->format.field = V4L2_FIELD_NONE;
507
508 mutex_lock(&csi->lock);
509
510 pad = &csi->pads[format->pad];
511 if (pad->flags & MEDIA_PAD_FL_SOURCE)
512 format->format = csi->format_mbus[CSI_PAD_SINK];
513
514 *mbusformat = format->format;
515
516 if (pad->flags & MEDIA_PAD_FL_SINK)
517 *source_mbusformat = format->format;
518
519 mutex_unlock(&csi->lock);
520
521 return 0;
522 }
523
mei_csi_g_volatile_ctrl(struct v4l2_ctrl * ctrl)524 static int mei_csi_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
525 {
526 struct mei_csi *csi = ctrl_to_csi(ctrl);
527 s64 freq;
528
529 if (ctrl->id == V4L2_CID_LINK_FREQ) {
530 if (!csi->remote)
531 return -EINVAL;
532
533 freq = v4l2_get_link_freq(csi->remote->ctrl_handler, 0, 0);
534 if (freq < 0) {
535 dev_err(&csi->cldev->dev,
536 "error %lld, invalid link_freq\n", freq);
537 return -EINVAL;
538 }
539
540 link_freq_menu_items[0] = freq;
541 ctrl->val = 0;
542
543 return 0;
544 }
545
546 return -EINVAL;
547 }
548
549 static const struct v4l2_ctrl_ops mei_csi_ctrl_ops = {
550 .g_volatile_ctrl = mei_csi_g_volatile_ctrl,
551 };
552
553 static const struct v4l2_subdev_video_ops mei_csi_video_ops = {
554 .s_stream = mei_csi_set_stream,
555 };
556
557 static const struct v4l2_subdev_pad_ops mei_csi_pad_ops = {
558 .init_cfg = mei_csi_init_cfg,
559 .get_fmt = mei_csi_get_fmt,
560 .set_fmt = mei_csi_set_fmt,
561 };
562
563 static const struct v4l2_subdev_ops mei_csi_subdev_ops = {
564 .video = &mei_csi_video_ops,
565 .pad = &mei_csi_pad_ops,
566 };
567
568 static const struct media_entity_operations mei_csi_entity_ops = {
569 .link_validate = v4l2_subdev_link_validate,
570 };
571
mei_csi_notify_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)572 static int mei_csi_notify_bound(struct v4l2_async_notifier *notifier,
573 struct v4l2_subdev *subdev,
574 struct v4l2_async_connection *asd)
575 {
576 struct mei_csi *csi = notifier_to_csi(notifier);
577 int pad;
578
579 pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
580 MEDIA_PAD_FL_SOURCE);
581 if (pad < 0)
582 return pad;
583
584 csi->remote = subdev;
585 csi->remote_pad = pad;
586
587 return media_create_pad_link(&subdev->entity, pad,
588 &csi->subdev.entity, CSI_PAD_SINK,
589 MEDIA_LNK_FL_ENABLED |
590 MEDIA_LNK_FL_IMMUTABLE);
591 }
592
mei_csi_notify_unbind(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)593 static void mei_csi_notify_unbind(struct v4l2_async_notifier *notifier,
594 struct v4l2_subdev *subdev,
595 struct v4l2_async_connection *asd)
596 {
597 struct mei_csi *csi = notifier_to_csi(notifier);
598
599 csi->remote = NULL;
600 }
601
602 static const struct v4l2_async_notifier_operations mei_csi_notify_ops = {
603 .bound = mei_csi_notify_bound,
604 .unbind = mei_csi_notify_unbind,
605 };
606
mei_csi_init_controls(struct mei_csi * csi)607 static int mei_csi_init_controls(struct mei_csi *csi)
608 {
609 u32 max;
610 int ret;
611
612 ret = v4l2_ctrl_handler_init(&csi->ctrl_handler, 2);
613 if (ret)
614 return ret;
615
616 csi->ctrl_handler.lock = &csi->lock;
617
618 max = ARRAY_SIZE(link_freq_menu_items) - 1;
619 csi->freq_ctrl = v4l2_ctrl_new_int_menu(&csi->ctrl_handler,
620 &mei_csi_ctrl_ops,
621 V4L2_CID_LINK_FREQ,
622 max,
623 0,
624 link_freq_menu_items);
625 if (csi->freq_ctrl)
626 csi->freq_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY |
627 V4L2_CTRL_FLAG_VOLATILE;
628
629 csi->privacy_ctrl = v4l2_ctrl_new_std(&csi->ctrl_handler, NULL,
630 V4L2_CID_PRIVACY, 0, 1, 1, 0);
631 if (csi->privacy_ctrl)
632 csi->privacy_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
633
634 if (csi->ctrl_handler.error)
635 return csi->ctrl_handler.error;
636
637 csi->subdev.ctrl_handler = &csi->ctrl_handler;
638
639 return 0;
640 }
641
mei_csi_parse_firmware(struct mei_csi * csi)642 static int mei_csi_parse_firmware(struct mei_csi *csi)
643 {
644 struct v4l2_fwnode_endpoint v4l2_ep = {
645 .bus_type = V4L2_MBUS_CSI2_DPHY,
646 };
647 struct device *dev = &csi->cldev->dev;
648 struct v4l2_async_connection *asd;
649 struct fwnode_handle *fwnode;
650 struct fwnode_handle *ep;
651 int ret;
652
653 ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0, 0);
654 if (!ep) {
655 dev_err(dev, "not connected to subdevice\n");
656 return -EINVAL;
657 }
658
659 ret = v4l2_fwnode_endpoint_parse(ep, &v4l2_ep);
660 if (ret) {
661 dev_err(dev, "could not parse v4l2 endpoint\n");
662 fwnode_handle_put(ep);
663 return -EINVAL;
664 }
665
666 fwnode = fwnode_graph_get_remote_endpoint(ep);
667 fwnode_handle_put(ep);
668
669 v4l2_async_subdev_nf_init(&csi->notifier, &csi->subdev);
670 csi->notifier.ops = &mei_csi_notify_ops;
671
672 asd = v4l2_async_nf_add_fwnode(&csi->notifier, fwnode,
673 struct v4l2_async_connection);
674 if (IS_ERR(asd)) {
675 fwnode_handle_put(fwnode);
676 return PTR_ERR(asd);
677 }
678
679 ret = v4l2_fwnode_endpoint_alloc_parse(fwnode, &v4l2_ep);
680 fwnode_handle_put(fwnode);
681 if (ret)
682 return ret;
683 csi->nr_of_lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes;
684
685 ret = v4l2_async_nf_register(&csi->notifier);
686 if (ret)
687 v4l2_async_nf_cleanup(&csi->notifier);
688
689 v4l2_fwnode_endpoint_free(&v4l2_ep);
690
691 return ret;
692 }
693
mei_csi_probe(struct mei_cl_device * cldev,const struct mei_cl_device_id * id)694 static int mei_csi_probe(struct mei_cl_device *cldev,
695 const struct mei_cl_device_id *id)
696 {
697 struct device *dev = &cldev->dev;
698 struct mei_csi *csi;
699 int ret;
700
701 if (!dev_fwnode(dev))
702 return -EPROBE_DEFER;
703
704 csi = devm_kzalloc(dev, sizeof(struct mei_csi), GFP_KERNEL);
705 if (!csi)
706 return -ENOMEM;
707
708 csi->cldev = cldev;
709 mutex_init(&csi->lock);
710 init_completion(&csi->cmd_completion);
711
712 mei_cldev_set_drvdata(cldev, csi);
713
714 ret = mei_cldev_enable(cldev);
715 if (ret < 0) {
716 dev_err(dev, "mei_cldev_enable failed: %d\n", ret);
717 goto destroy_mutex;
718 }
719
720 ret = mei_cldev_register_rx_cb(cldev, mei_csi_rx);
721 if (ret) {
722 dev_err(dev, "event cb registration failed: %d\n", ret);
723 goto err_disable;
724 }
725
726 ret = mei_csi_parse_firmware(csi);
727 if (ret)
728 goto err_disable;
729
730 csi->subdev.dev = &cldev->dev;
731 v4l2_subdev_init(&csi->subdev, &mei_csi_subdev_ops);
732 v4l2_set_subdevdata(&csi->subdev, csi);
733 csi->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE |
734 V4L2_SUBDEV_FL_HAS_EVENTS;
735 csi->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
736 csi->subdev.entity.ops = &mei_csi_entity_ops;
737
738 snprintf(csi->subdev.name, sizeof(csi->subdev.name),
739 MEI_CSI_ENTITY_NAME);
740
741 ret = mei_csi_init_controls(csi);
742 if (ret)
743 goto err_ctrl_handler;
744
745 csi->format_mbus[CSI_PAD_SOURCE] = mei_csi_format_mbus_default;
746 csi->format_mbus[CSI_PAD_SINK] = mei_csi_format_mbus_default;
747
748 csi->pads[CSI_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
749 csi->pads[CSI_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
750 ret = media_entity_pads_init(&csi->subdev.entity, CSI_NUM_PADS,
751 csi->pads);
752 if (ret)
753 goto err_ctrl_handler;
754
755 ret = v4l2_subdev_init_finalize(&csi->subdev);
756 if (ret < 0)
757 goto err_entity;
758
759 ret = v4l2_async_register_subdev(&csi->subdev);
760 if (ret < 0)
761 goto err_subdev;
762
763 pm_runtime_enable(&cldev->dev);
764
765 return 0;
766
767 err_subdev:
768 v4l2_subdev_cleanup(&csi->subdev);
769
770 err_entity:
771 media_entity_cleanup(&csi->subdev.entity);
772
773 err_ctrl_handler:
774 v4l2_ctrl_handler_free(&csi->ctrl_handler);
775 v4l2_async_nf_unregister(&csi->notifier);
776 v4l2_async_nf_cleanup(&csi->notifier);
777
778 err_disable:
779 mei_cldev_disable(cldev);
780
781 destroy_mutex:
782 mutex_destroy(&csi->lock);
783
784 return ret;
785 }
786
mei_csi_remove(struct mei_cl_device * cldev)787 static void mei_csi_remove(struct mei_cl_device *cldev)
788 {
789 struct mei_csi *csi = mei_cldev_get_drvdata(cldev);
790
791 v4l2_async_nf_unregister(&csi->notifier);
792 v4l2_async_nf_cleanup(&csi->notifier);
793 v4l2_ctrl_handler_free(&csi->ctrl_handler);
794 v4l2_async_unregister_subdev(&csi->subdev);
795 v4l2_subdev_cleanup(&csi->subdev);
796 media_entity_cleanup(&csi->subdev.entity);
797
798 pm_runtime_disable(&cldev->dev);
799
800 mutex_destroy(&csi->lock);
801 }
802
803 #define MEI_CSI_UUID UUID_LE(0x92335FCF, 0x3203, 0x4472, \
804 0xAF, 0x93, 0x7b, 0x44, 0x53, 0xAC, 0x29, 0xDA)
805
806 static const struct mei_cl_device_id mei_csi_tbl[] = {
807 { MEI_CSI_DRIVER_NAME, MEI_CSI_UUID, MEI_CL_VERSION_ANY },
808 { /* sentinel */ }
809 };
810 MODULE_DEVICE_TABLE(mei, mei_csi_tbl);
811
812 static struct mei_cl_driver mei_csi_driver = {
813 .id_table = mei_csi_tbl,
814 .name = MEI_CSI_DRIVER_NAME,
815
816 .probe = mei_csi_probe,
817 .remove = mei_csi_remove,
818 };
819
820 module_mei_cl_driver(mei_csi_driver);
821
822 MODULE_AUTHOR("Wentong Wu <wentong.wu@intel.com>");
823 MODULE_AUTHOR("Zhifeng Wang <zhifeng.wang@intel.com>");
824 MODULE_DESCRIPTION("Device driver for IVSC CSI");
825 MODULE_LICENSE("GPL");
826