Merge tag 'v3.8-rc3' into v4l_for_linus
[~shefty/rdma-dev.git] / drivers / media / platform / s5p-fimc / fimc-mdevice.c
1 /*
2  * S5P/EXYNOS4 SoC series camera host interface media device driver
3  *
4  * Copyright (C) 2011 Samsung Electronics Co., Ltd.
5  * Contact: Sylwester Nawrocki, <s.nawrocki@samsung.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published
9  * by the Free Software Foundation, either version 2 of the License,
10  * or (at your option) any later version.
11  */
12
13 #include <linux/bug.h>
14 #include <linux/device.h>
15 #include <linux/errno.h>
16 #include <linux/i2c.h>
17 #include <linux/kernel.h>
18 #include <linux/list.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/types.h>
23 #include <linux/slab.h>
24 #include <media/v4l2-ctrls.h>
25 #include <media/media-device.h>
26 #include <media/s5p_fimc.h>
27
28 #include "fimc-core.h"
29 #include "fimc-lite.h"
30 #include "fimc-mdevice.h"
31 #include "mipi-csis.h"
32
33 static int __fimc_md_set_camclk(struct fimc_md *fmd,
34                                 struct fimc_sensor_info *s_info,
35                                 bool on);
36 /**
37  * fimc_pipeline_prepare - update pipeline information with subdevice pointers
38  * @fimc: fimc device terminating the pipeline
39  *
40  * Caller holds the graph mutex.
41  */
42 static void fimc_pipeline_prepare(struct fimc_pipeline *p,
43                                   struct media_entity *me)
44 {
45         struct media_pad *pad = &me->pads[0];
46         struct v4l2_subdev *sd;
47         int i;
48
49         for (i = 0; i < IDX_MAX; i++)
50                 p->subdevs[i] = NULL;
51
52         while (1) {
53                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
54                         break;
55
56                 /* source pad */
57                 pad = media_entity_remote_source(pad);
58                 if (pad == NULL ||
59                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
60                         break;
61
62                 sd = media_entity_to_v4l2_subdev(pad->entity);
63
64                 switch (sd->grp_id) {
65                 case SENSOR_GROUP_ID:
66                         p->subdevs[IDX_SENSOR] = sd;
67                         break;
68                 case CSIS_GROUP_ID:
69                         p->subdevs[IDX_CSIS] = sd;
70                         break;
71                 case FLITE_GROUP_ID:
72                         p->subdevs[IDX_FLITE] = sd;
73                         break;
74                 case FIMC_GROUP_ID:
75                         /* No need to control FIMC subdev through subdev ops */
76                         break;
77                 default:
78                         pr_warn("%s: Unknown subdev grp_id: %#x\n",
79                                 __func__, sd->grp_id);
80                 }
81                 /* sink pad */
82                 pad = &sd->entity.pads[0];
83         }
84 }
85
86 /**
87  * __subdev_set_power - change power state of a single subdev
88  * @sd: subdevice to change power state for
89  * @on: 1 to enable power or 0 to disable
90  *
91  * Return result of s_power subdev operation or -ENXIO if sd argument
92  * is NULL. Return 0 if the subdevice does not implement s_power.
93  */
94 static int __subdev_set_power(struct v4l2_subdev *sd, int on)
95 {
96         int *use_count;
97         int ret;
98
99         if (sd == NULL)
100                 return -ENXIO;
101
102         use_count = &sd->entity.use_count;
103         if (on && (*use_count)++ > 0)
104                 return 0;
105         else if (!on && (*use_count == 0 || --(*use_count) > 0))
106                 return 0;
107         ret = v4l2_subdev_call(sd, core, s_power, on);
108
109         return ret != -ENOIOCTLCMD ? ret : 0;
110 }
111
112 /**
113  * fimc_pipeline_s_power - change power state of all pipeline subdevs
114  * @fimc: fimc device terminating the pipeline
115  * @state: true to power on, false to power off
116  *
117  * Needs to be called with the graph mutex held.
118  */
119 static int fimc_pipeline_s_power(struct fimc_pipeline *p, bool state)
120 {
121         unsigned int i;
122         int ret;
123
124         if (p->subdevs[IDX_SENSOR] == NULL)
125                 return -ENXIO;
126
127         for (i = 0; i < IDX_MAX; i++) {
128                 unsigned int idx = state ? (IDX_MAX - 1) - i : i;
129
130                 ret = __subdev_set_power(p->subdevs[idx], state);
131                 if (ret < 0 && ret != -ENXIO)
132                         return ret;
133         }
134
135         return 0;
136 }
137
138 /**
139  * __fimc_pipeline_open - update the pipeline information, enable power
140  *                        of all pipeline subdevs and the sensor clock
141  * @me: media entity to start graph walk with
142  * @prep: true to acquire sensor (and csis) subdevs
143  *
144  * This function must be called with the graph mutex held.
145  */
146 static int __fimc_pipeline_open(struct fimc_pipeline *p,
147                                 struct media_entity *me, bool prep)
148 {
149         int ret;
150
151         if (prep)
152                 fimc_pipeline_prepare(p, me);
153
154         if (p->subdevs[IDX_SENSOR] == NULL)
155                 return -EINVAL;
156
157         ret = fimc_md_set_camclk(p->subdevs[IDX_SENSOR], true);
158         if (ret)
159                 return ret;
160
161         return fimc_pipeline_s_power(p, 1);
162 }
163
164 static int fimc_pipeline_open(struct fimc_pipeline *p,
165                               struct media_entity *me, bool prep)
166 {
167         int ret;
168
169         mutex_lock(&me->parent->graph_mutex);
170         ret =  __fimc_pipeline_open(p, me, prep);
171         mutex_unlock(&me->parent->graph_mutex);
172
173         return ret;
174 }
175
176 /**
177  * __fimc_pipeline_close - disable the sensor clock and pipeline power
178  * @fimc: fimc device terminating the pipeline
179  *
180  * Disable power of all subdevs in the pipeline and turn off the external
181  * sensor clock.
182  * Called with the graph mutex held.
183  */
184 static int __fimc_pipeline_close(struct fimc_pipeline *p)
185 {
186         int ret = 0;
187
188         if (p->subdevs[IDX_SENSOR]) {
189                 ret = fimc_pipeline_s_power(p, 0);
190                 fimc_md_set_camclk(p->subdevs[IDX_SENSOR], false);
191         }
192         return ret == -ENXIO ? 0 : ret;
193 }
194
195 static int fimc_pipeline_close(struct fimc_pipeline *p)
196 {
197         struct media_entity *me;
198         int ret;
199
200         if (!p || !p->subdevs[IDX_SENSOR])
201                 return -EINVAL;
202
203         me = &p->subdevs[IDX_SENSOR]->entity;
204         mutex_lock(&me->parent->graph_mutex);
205         ret = __fimc_pipeline_close(p);
206         mutex_unlock(&me->parent->graph_mutex);
207
208         return ret;
209 }
210
211 /**
212  * fimc_pipeline_s_stream - invoke s_stream on pipeline subdevs
213  * @pipeline: video pipeline structure
214  * @on: passed as the s_stream call argument
215  */
216 static int fimc_pipeline_s_stream(struct fimc_pipeline *p, bool on)
217 {
218         int i, ret;
219
220         if (p->subdevs[IDX_SENSOR] == NULL)
221                 return -ENODEV;
222
223         for (i = 0; i < IDX_MAX; i++) {
224                 unsigned int idx = on ? (IDX_MAX - 1) - i : i;
225
226                 ret = v4l2_subdev_call(p->subdevs[idx], video, s_stream, on);
227
228                 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
229                         return ret;
230         }
231
232         return 0;
233
234 }
235
236 /* Media pipeline operations for the FIMC/FIMC-LITE video device driver */
237 static const struct fimc_pipeline_ops fimc_pipeline_ops = {
238         .open           = fimc_pipeline_open,
239         .close          = fimc_pipeline_close,
240         .set_stream     = fimc_pipeline_s_stream,
241 };
242
243 /*
244  * Sensor subdevice helper functions
245  */
246 static struct v4l2_subdev *fimc_md_register_sensor(struct fimc_md *fmd,
247                                    struct fimc_sensor_info *s_info)
248 {
249         struct i2c_adapter *adapter;
250         struct v4l2_subdev *sd = NULL;
251
252         if (!s_info || !fmd)
253                 return NULL;
254
255         adapter = i2c_get_adapter(s_info->pdata.i2c_bus_num);
256         if (!adapter) {
257                 v4l2_warn(&fmd->v4l2_dev,
258                           "Failed to get I2C adapter %d, deferring probe\n",
259                           s_info->pdata.i2c_bus_num);
260                 return ERR_PTR(-EPROBE_DEFER);
261         }
262         sd = v4l2_i2c_new_subdev_board(&fmd->v4l2_dev, adapter,
263                                        s_info->pdata.board_info, NULL);
264         if (IS_ERR_OR_NULL(sd)) {
265                 i2c_put_adapter(adapter);
266                 v4l2_warn(&fmd->v4l2_dev,
267                           "Failed to acquire subdev %s, deferring probe\n",
268                           s_info->pdata.board_info->type);
269                 return ERR_PTR(-EPROBE_DEFER);
270         }
271         v4l2_set_subdev_hostdata(sd, s_info);
272         sd->grp_id = SENSOR_GROUP_ID;
273
274         v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice %s\n",
275                   s_info->pdata.board_info->type);
276         return sd;
277 }
278
279 static void fimc_md_unregister_sensor(struct v4l2_subdev *sd)
280 {
281         struct i2c_client *client = v4l2_get_subdevdata(sd);
282         struct i2c_adapter *adapter;
283
284         if (!client)
285                 return;
286         v4l2_device_unregister_subdev(sd);
287         adapter = client->adapter;
288         i2c_unregister_device(client);
289         if (adapter)
290                 i2c_put_adapter(adapter);
291 }
292
293 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
294 {
295         struct s5p_platform_fimc *pdata = fmd->pdev->dev.platform_data;
296         struct fimc_dev *fd = NULL;
297         int num_clients, ret, i;
298
299         /*
300          * Runtime resume one of the FIMC entities to make sure
301          * the sclk_cam clocks are not globally disabled.
302          */
303         for (i = 0; !fd && i < ARRAY_SIZE(fmd->fimc); i++)
304                 if (fmd->fimc[i])
305                         fd = fmd->fimc[i];
306         if (!fd)
307                 return -ENXIO;
308         ret = pm_runtime_get_sync(&fd->pdev->dev);
309         if (ret < 0)
310                 return ret;
311
312         WARN_ON(pdata->num_clients > ARRAY_SIZE(fmd->sensor));
313         num_clients = min_t(u32, pdata->num_clients, ARRAY_SIZE(fmd->sensor));
314
315         fmd->num_sensors = num_clients;
316         for (i = 0; i < num_clients; i++) {
317                 struct v4l2_subdev *sd;
318
319                 fmd->sensor[i].pdata = pdata->isp_info[i];
320                 ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], true);
321                 if (ret)
322                         break;
323                 sd = fimc_md_register_sensor(fmd, &fmd->sensor[i]);
324                 ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], false);
325
326                 if (!IS_ERR(sd)) {
327                         fmd->sensor[i].subdev = sd;
328                 } else {
329                         fmd->sensor[i].subdev = NULL;
330                         ret = PTR_ERR(sd);
331                         break;
332                 }
333                 if (ret)
334                         break;
335         }
336         pm_runtime_put(&fd->pdev->dev);
337         return ret;
338 }
339
340 /*
341  * MIPI CSIS and FIMC platform devices registration.
342  */
343 static int fimc_register_callback(struct device *dev, void *p)
344 {
345         struct fimc_dev *fimc = dev_get_drvdata(dev);
346         struct v4l2_subdev *sd;
347         struct fimc_md *fmd = p;
348         int ret;
349
350         if (fimc == NULL || fimc->id >= FIMC_MAX_DEVS)
351                 return 0;
352
353         sd = &fimc->vid_cap.subdev;
354         sd->grp_id = FIMC_GROUP_ID;
355         v4l2_set_subdev_hostdata(sd, (void *)&fimc_pipeline_ops);
356
357         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
358         if (ret) {
359                 v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
360                          fimc->id, ret);
361                 return ret;
362         }
363
364         fmd->fimc[fimc->id] = fimc;
365         return 0;
366 }
367
368 static int fimc_lite_register_callback(struct device *dev, void *p)
369 {
370         struct fimc_lite *fimc = dev_get_drvdata(dev);
371         struct fimc_md *fmd = p;
372         int ret;
373
374         if (fimc == NULL || fimc->index >= FIMC_LITE_MAX_DEVS)
375                 return 0;
376
377         fimc->subdev.grp_id = FLITE_GROUP_ID;
378         v4l2_set_subdev_hostdata(&fimc->subdev, (void *)&fimc_pipeline_ops);
379
380         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, &fimc->subdev);
381         if (ret) {
382                 v4l2_err(&fmd->v4l2_dev,
383                          "Failed to register FIMC-LITE.%d (%d)\n",
384                          fimc->index, ret);
385                 return ret;
386         }
387
388         fmd->fimc_lite[fimc->index] = fimc;
389         return 0;
390 }
391
392 static int csis_register_callback(struct device *dev, void *p)
393 {
394         struct v4l2_subdev *sd = dev_get_drvdata(dev);
395         struct platform_device *pdev;
396         struct fimc_md *fmd = p;
397         int id, ret;
398
399         if (!sd)
400                 return 0;
401         pdev = v4l2_get_subdevdata(sd);
402         if (!pdev || pdev->id < 0 || pdev->id >= CSIS_MAX_ENTITIES)
403                 return 0;
404         v4l2_info(sd, "csis%d sd: %s\n", pdev->id, sd->name);
405
406         id = pdev->id < 0 ? 0 : pdev->id;
407         sd->grp_id = CSIS_GROUP_ID;
408
409         ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
410         if (!ret)
411                 fmd->csis[id].sd = sd;
412         else
413                 v4l2_err(&fmd->v4l2_dev,
414                          "Failed to register CSIS subdevice: %d\n", ret);
415         return ret;
416 }
417
418 /**
419  * fimc_md_register_platform_entities - register FIMC and CSIS media entities
420  */
421 static int fimc_md_register_platform_entities(struct fimc_md *fmd)
422 {
423         struct s5p_platform_fimc *pdata = fmd->pdev->dev.platform_data;
424         struct device_driver *driver;
425         int ret, i;
426
427         driver = driver_find(FIMC_MODULE_NAME, &platform_bus_type);
428         if (!driver) {
429                 v4l2_warn(&fmd->v4l2_dev,
430                          "%s driver not found, deffering probe\n",
431                          FIMC_MODULE_NAME);
432                 return -EPROBE_DEFER;
433         }
434
435         ret = driver_for_each_device(driver, NULL, fmd,
436                                      fimc_register_callback);
437         if (ret)
438                 return ret;
439
440         driver = driver_find(FIMC_LITE_DRV_NAME, &platform_bus_type);
441         if (driver && try_module_get(driver->owner)) {
442                 ret = driver_for_each_device(driver, NULL, fmd,
443                                              fimc_lite_register_callback);
444                 if (ret)
445                         return ret;
446                 module_put(driver->owner);
447         }
448         /*
449          * Check if there is any sensor on the MIPI-CSI2 bus and
450          * if not skip the s5p-csis module loading.
451          */
452         if (pdata == NULL)
453                 return 0;
454         for (i = 0; i < pdata->num_clients; i++) {
455                 if (pdata->isp_info[i].bus_type == FIMC_MIPI_CSI2) {
456                         ret = 1;
457                         break;
458                 }
459         }
460         if (!ret)
461                 return 0;
462
463         driver = driver_find(CSIS_DRIVER_NAME, &platform_bus_type);
464         if (!driver || !try_module_get(driver->owner)) {
465                 v4l2_warn(&fmd->v4l2_dev,
466                          "%s driver not found, deffering probe\n",
467                          CSIS_DRIVER_NAME);
468                 return -EPROBE_DEFER;
469         }
470
471         return driver_for_each_device(driver, NULL, fmd,
472                                       csis_register_callback);
473 }
474
475 static void fimc_md_unregister_entities(struct fimc_md *fmd)
476 {
477         int i;
478
479         for (i = 0; i < FIMC_MAX_DEVS; i++) {
480                 if (fmd->fimc[i] == NULL)
481                         continue;
482                 v4l2_device_unregister_subdev(&fmd->fimc[i]->vid_cap.subdev);
483                 fmd->fimc[i]->pipeline_ops = NULL;
484                 fmd->fimc[i] = NULL;
485         }
486         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
487                 if (fmd->fimc_lite[i] == NULL)
488                         continue;
489                 v4l2_device_unregister_subdev(&fmd->fimc_lite[i]->subdev);
490                 fmd->fimc[i]->pipeline_ops = NULL;
491                 fmd->fimc_lite[i] = NULL;
492         }
493         for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
494                 if (fmd->csis[i].sd == NULL)
495                         continue;
496                 v4l2_device_unregister_subdev(fmd->csis[i].sd);
497                 module_put(fmd->csis[i].sd->owner);
498                 fmd->csis[i].sd = NULL;
499         }
500         for (i = 0; i < fmd->num_sensors; i++) {
501                 if (fmd->sensor[i].subdev == NULL)
502                         continue;
503                 fimc_md_unregister_sensor(fmd->sensor[i].subdev);
504                 fmd->sensor[i].subdev = NULL;
505         }
506 }
507
508 /**
509  * __fimc_md_create_fimc_links - create links to all FIMC entities
510  * @fmd: fimc media device
511  * @source: the source entity to create links to all fimc entities from
512  * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
513  * @pad: the source entity pad index
514  * @link_mask: bitmask of the fimc devices for which link should be enabled
515  */
516 static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
517                                             struct media_entity *source,
518                                             struct v4l2_subdev *sensor,
519                                             int pad, int link_mask)
520 {
521         struct fimc_sensor_info *s_info;
522         struct media_entity *sink;
523         unsigned int flags = 0;
524         int ret, i;
525
526         for (i = 0; i < FIMC_MAX_DEVS; i++) {
527                 if (!fmd->fimc[i])
528                         continue;
529                 /*
530                  * Some FIMC variants are not fitted with camera capture
531                  * interface. Skip creating a link from sensor for those.
532                  */
533                 if (!fmd->fimc[i]->variant->has_cam_if)
534                         continue;
535
536                 flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;
537
538                 sink = &fmd->fimc[i]->vid_cap.subdev.entity;
539                 ret = media_entity_create_link(source, pad, sink,
540                                               FIMC_SD_PAD_SINK, flags);
541                 if (ret)
542                         return ret;
543
544                 /* Notify FIMC capture subdev entity */
545                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
546                                         &source->pads[pad], flags);
547                 if (ret)
548                         break;
549
550                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
551                           source->name, flags ? '=' : '-', sink->name);
552
553                 if (flags == 0 || sensor == NULL)
554                         continue;
555                 s_info = v4l2_get_subdev_hostdata(sensor);
556                 if (!WARN_ON(s_info == NULL)) {
557                         unsigned long irq_flags;
558                         spin_lock_irqsave(&fmd->slock, irq_flags);
559                         s_info->host = fmd->fimc[i];
560                         spin_unlock_irqrestore(&fmd->slock, irq_flags);
561                 }
562         }
563
564         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
565                 if (!fmd->fimc_lite[i])
566                         continue;
567
568                 if (link_mask & (1 << (i + FIMC_MAX_DEVS)))
569                         flags = MEDIA_LNK_FL_ENABLED;
570                 else
571                         flags = 0;
572
573                 sink = &fmd->fimc_lite[i]->subdev.entity;
574                 ret = media_entity_create_link(source, pad, sink,
575                                                FLITE_SD_PAD_SINK, flags);
576                 if (ret)
577                         return ret;
578
579                 /* Notify FIMC-LITE subdev entity */
580                 ret = media_entity_call(sink, link_setup, &sink->pads[0],
581                                         &source->pads[pad], flags);
582                 if (ret)
583                         break;
584
585                 v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]",
586                           source->name, flags ? '=' : '-', sink->name);
587         }
588         return 0;
589 }
590
591 /* Create links from FIMC-LITE source pads to other entities */
592 static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
593 {
594         struct media_entity *source, *sink;
595         unsigned int flags = MEDIA_LNK_FL_ENABLED;
596         int i, ret = 0;
597
598         for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
599                 struct fimc_lite *fimc = fmd->fimc_lite[i];
600                 if (fimc == NULL)
601                         continue;
602                 source = &fimc->subdev.entity;
603                 sink = &fimc->vfd.entity;
604                 /* FIMC-LITE's subdev and video node */
605                 ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
606                                                sink, 0, flags);
607                 if (ret)
608                         break;
609                 /* TODO: create links to other entities */
610         }
611
612         return ret;
613 }
614
615 /**
616  * fimc_md_create_links - create default links between registered entities
617  *
618  * Parallel interface sensor entities are connected directly to FIMC capture
619  * entities. The sensors using MIPI CSIS bus are connected through immutable
620  * link with CSI receiver entity specified by mux_id. Any registered CSIS
621  * entity has a link to each registered FIMC capture entity. Enabled links
622  * are created by default between each subsequent registered sensor and
623  * subsequent FIMC capture entity. The number of default active links is
624  * determined by the number of available sensors or FIMC entities,
625  * whichever is less.
626  */
627 static int fimc_md_create_links(struct fimc_md *fmd)
628 {
629         struct v4l2_subdev *csi_sensors[2] = { NULL };
630         struct v4l2_subdev *sensor, *csis;
631         struct s5p_fimc_isp_info *pdata;
632         struct fimc_sensor_info *s_info;
633         struct media_entity *source, *sink;
634         int i, pad, fimc_id = 0, ret = 0;
635         u32 flags, link_mask = 0;
636
637         for (i = 0; i < fmd->num_sensors; i++) {
638                 if (fmd->sensor[i].subdev == NULL)
639                         continue;
640
641                 sensor = fmd->sensor[i].subdev;
642                 s_info = v4l2_get_subdev_hostdata(sensor);
643                 if (!s_info)
644                         continue;
645
646                 source = NULL;
647                 pdata = &s_info->pdata;
648
649                 switch (pdata->bus_type) {
650                 case FIMC_MIPI_CSI2:
651                         if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
652                                 "Wrong CSI channel id: %d\n", pdata->mux_id))
653                                 return -EINVAL;
654
655                         csis = fmd->csis[pdata->mux_id].sd;
656                         if (WARN(csis == NULL,
657                                  "MIPI-CSI interface specified "
658                                  "but s5p-csis module is not loaded!\n"))
659                                 return -EINVAL;
660
661                         ret = media_entity_create_link(&sensor->entity, 0,
662                                               &csis->entity, CSIS_PAD_SINK,
663                                               MEDIA_LNK_FL_IMMUTABLE |
664                                               MEDIA_LNK_FL_ENABLED);
665                         if (ret)
666                                 return ret;
667
668                         v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]",
669                                   sensor->entity.name, csis->entity.name);
670
671                         source = NULL;
672                         csi_sensors[pdata->mux_id] = sensor;
673                         break;
674
675                 case FIMC_ITU_601...FIMC_ITU_656:
676                         source = &sensor->entity;
677                         pad = 0;
678                         break;
679
680                 default:
681                         v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
682                                  pdata->bus_type);
683                         return -EINVAL;
684                 }
685                 if (source == NULL)
686                         continue;
687
688                 link_mask = 1 << fimc_id++;
689                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
690                                                        pad, link_mask);
691         }
692
693         for (i = 0; i < ARRAY_SIZE(fmd->csis); i++) {
694                 if (fmd->csis[i].sd == NULL)
695                         continue;
696                 source = &fmd->csis[i].sd->entity;
697                 pad = CSIS_PAD_SOURCE;
698                 sensor = csi_sensors[i];
699
700                 link_mask = 1 << fimc_id++;
701                 ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
702                                                        pad, link_mask);
703         }
704
705         /* Create immutable links between each FIMC's subdev and video node */
706         flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
707         for (i = 0; i < FIMC_MAX_DEVS; i++) {
708                 if (!fmd->fimc[i])
709                         continue;
710                 source = &fmd->fimc[i]->vid_cap.subdev.entity;
711                 sink = &fmd->fimc[i]->vid_cap.vfd.entity;
712                 ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
713                                               sink, 0, flags);
714                 if (ret)
715                         break;
716         }
717
718         return __fimc_md_create_flite_source_links(fmd);
719 }
720
721 /*
722  * The peripheral sensor clock management.
723  */
724 static int fimc_md_get_clocks(struct fimc_md *fmd)
725 {
726         char clk_name[32];
727         struct clk *clock;
728         int i;
729
730         for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
731                 snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
732                 clock = clk_get(NULL, clk_name);
733                 if (IS_ERR_OR_NULL(clock)) {
734                         v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s",
735                                   clk_name);
736                         return -ENXIO;
737                 }
738                 fmd->camclk[i].clock = clock;
739         }
740         return 0;
741 }
742
743 static void fimc_md_put_clocks(struct fimc_md *fmd)
744 {
745         int i = FIMC_MAX_CAMCLKS;
746
747         while (--i >= 0) {
748                 if (IS_ERR_OR_NULL(fmd->camclk[i].clock))
749                         continue;
750                 clk_put(fmd->camclk[i].clock);
751                 fmd->camclk[i].clock = NULL;
752         }
753 }
754
755 static int __fimc_md_set_camclk(struct fimc_md *fmd,
756                                 struct fimc_sensor_info *s_info,
757                                 bool on)
758 {
759         struct s5p_fimc_isp_info *pdata = &s_info->pdata;
760         struct fimc_camclk_info *camclk;
761         int ret = 0;
762
763         if (WARN_ON(pdata->clk_id >= FIMC_MAX_CAMCLKS) || fmd == NULL)
764                 return -EINVAL;
765
766         camclk = &fmd->camclk[pdata->clk_id];
767
768         dbg("camclk %d, f: %lu, use_count: %d, on: %d",
769             pdata->clk_id, pdata->clk_frequency, camclk->use_count, on);
770
771         if (on) {
772                 if (camclk->use_count > 0 &&
773                     camclk->frequency != pdata->clk_frequency)
774                         return -EINVAL;
775
776                 if (camclk->use_count++ == 0) {
777                         clk_set_rate(camclk->clock, pdata->clk_frequency);
778                         camclk->frequency = pdata->clk_frequency;
779                         ret = clk_enable(camclk->clock);
780                         dbg("Enabled camclk %d: f: %lu", pdata->clk_id,
781                             clk_get_rate(camclk->clock));
782                 }
783                 return ret;
784         }
785
786         if (WARN_ON(camclk->use_count == 0))
787                 return 0;
788
789         if (--camclk->use_count == 0) {
790                 clk_disable(camclk->clock);
791                 dbg("Disabled camclk %d", pdata->clk_id);
792         }
793         return ret;
794 }
795
796 /**
797  * fimc_md_set_camclk - peripheral sensor clock setup
798  * @sd: sensor subdev to configure sclk_cam clock for
799  * @on: 1 to enable or 0 to disable the clock
800  *
801  * There are 2 separate clock outputs available in the SoC for external
802  * image processors. These clocks are shared between all registered FIMC
803  * devices to which sensors can be attached, either directly or through
804  * the MIPI CSI receiver. The clock is allowed here to be used by
805  * multiple sensors concurrently if they use same frequency.
806  * This function should only be called when the graph mutex is held.
807  */
808 int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on)
809 {
810         struct fimc_sensor_info *s_info = v4l2_get_subdev_hostdata(sd);
811         struct fimc_md *fmd = entity_to_fimc_mdev(&sd->entity);
812
813         return __fimc_md_set_camclk(fmd, s_info, on);
814 }
815
816 static int fimc_md_link_notify(struct media_pad *source,
817                                struct media_pad *sink, u32 flags)
818 {
819         struct fimc_lite *fimc_lite = NULL;
820         struct fimc_dev *fimc = NULL;
821         struct fimc_pipeline *pipeline;
822         struct v4l2_subdev *sd;
823         int ret = 0;
824
825         if (media_entity_type(sink->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
826                 return 0;
827
828         sd = media_entity_to_v4l2_subdev(sink->entity);
829
830         switch (sd->grp_id) {
831         case FLITE_GROUP_ID:
832                 fimc_lite = v4l2_get_subdevdata(sd);
833                 pipeline = &fimc_lite->pipeline;
834                 break;
835         case FIMC_GROUP_ID:
836                 fimc = v4l2_get_subdevdata(sd);
837                 pipeline = &fimc->pipeline;
838                 break;
839         default:
840                 return 0;
841         }
842
843         if (!(flags & MEDIA_LNK_FL_ENABLED)) {
844                 ret = __fimc_pipeline_close(pipeline);
845                 pipeline->subdevs[IDX_SENSOR] = NULL;
846                 pipeline->subdevs[IDX_CSIS] = NULL;
847
848                 if (fimc) {
849                         mutex_lock(&fimc->lock);
850                         fimc_ctrls_delete(fimc->vid_cap.ctx);
851                         mutex_unlock(&fimc->lock);
852                 }
853                 return ret;
854         }
855         /*
856          * Link activation. Enable power of pipeline elements only if the
857          * pipeline is already in use, i.e. its video node is opened.
858          * Recreate the controls destroyed during the link deactivation.
859          */
860         if (fimc) {
861                 mutex_lock(&fimc->lock);
862                 if (fimc->vid_cap.refcnt > 0) {
863                         ret = __fimc_pipeline_open(pipeline,
864                                                    source->entity, true);
865                 if (!ret)
866                         ret = fimc_capture_ctrls_create(fimc);
867                 }
868                 mutex_unlock(&fimc->lock);
869         } else {
870                 mutex_lock(&fimc_lite->lock);
871                 if (fimc_lite->ref_count > 0) {
872                         ret = __fimc_pipeline_open(pipeline,
873                                                    source->entity, true);
874                 }
875                 mutex_unlock(&fimc_lite->lock);
876         }
877         return ret ? -EPIPE : ret;
878 }
879
880 static ssize_t fimc_md_sysfs_show(struct device *dev,
881                                   struct device_attribute *attr, char *buf)
882 {
883         struct platform_device *pdev = to_platform_device(dev);
884         struct fimc_md *fmd = platform_get_drvdata(pdev);
885
886         if (fmd->user_subdev_api)
887                 return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
888
889         return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
890 }
891
892 static ssize_t fimc_md_sysfs_store(struct device *dev,
893                                    struct device_attribute *attr,
894                                    const char *buf, size_t count)
895 {
896         struct platform_device *pdev = to_platform_device(dev);
897         struct fimc_md *fmd = platform_get_drvdata(pdev);
898         bool subdev_api;
899         int i;
900
901         if (!strcmp(buf, "vid-dev\n"))
902                 subdev_api = false;
903         else if (!strcmp(buf, "sub-dev\n"))
904                 subdev_api = true;
905         else
906                 return count;
907
908         fmd->user_subdev_api = subdev_api;
909         for (i = 0; i < FIMC_MAX_DEVS; i++)
910                 if (fmd->fimc[i])
911                         fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
912         return count;
913 }
914 /*
915  * This device attribute is to select video pipeline configuration method.
916  * There are following valid values:
917  *  vid-dev - for V4L2 video node API only, subdevice will be configured
918  *  by the host driver.
919  *  sub-dev - for media controller API, subdevs must be configured in user
920  *  space before starting streaming.
921  */
922 static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
923                    fimc_md_sysfs_show, fimc_md_sysfs_store);
924
925 static int fimc_md_probe(struct platform_device *pdev)
926 {
927         struct v4l2_device *v4l2_dev;
928         struct fimc_md *fmd;
929         int ret;
930
931         fmd = devm_kzalloc(&pdev->dev, sizeof(*fmd), GFP_KERNEL);
932         if (!fmd)
933                 return -ENOMEM;
934
935         spin_lock_init(&fmd->slock);
936         fmd->pdev = pdev;
937
938         strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
939                 sizeof(fmd->media_dev.model));
940         fmd->media_dev.link_notify = fimc_md_link_notify;
941         fmd->media_dev.dev = &pdev->dev;
942
943         v4l2_dev = &fmd->v4l2_dev;
944         v4l2_dev->mdev = &fmd->media_dev;
945         v4l2_dev->notify = fimc_sensor_notify;
946         snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s",
947                  dev_name(&pdev->dev));
948
949         ret = v4l2_device_register(&pdev->dev, &fmd->v4l2_dev);
950         if (ret < 0) {
951                 v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
952                 return ret;
953         }
954         ret = media_device_register(&fmd->media_dev);
955         if (ret < 0) {
956                 v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
957                 goto err_md;
958         }
959         ret = fimc_md_get_clocks(fmd);
960         if (ret)
961                 goto err_clk;
962
963         fmd->user_subdev_api = false;
964
965         /* Protect the media graph while we're registering entities */
966         mutex_lock(&fmd->media_dev.graph_mutex);
967
968         ret = fimc_md_register_platform_entities(fmd);
969         if (ret)
970                 goto err_unlock;
971
972         if (pdev->dev.platform_data) {
973                 ret = fimc_md_register_sensor_entities(fmd);
974                 if (ret)
975                         goto err_unlock;
976         }
977         ret = fimc_md_create_links(fmd);
978         if (ret)
979                 goto err_unlock;
980         ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
981         if (ret)
982                 goto err_unlock;
983
984         ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
985         if (ret)
986                 goto err_unlock;
987
988         platform_set_drvdata(pdev, fmd);
989         mutex_unlock(&fmd->media_dev.graph_mutex);
990         return 0;
991
992 err_unlock:
993         mutex_unlock(&fmd->media_dev.graph_mutex);
994 err_clk:
995         media_device_unregister(&fmd->media_dev);
996         fimc_md_put_clocks(fmd);
997         fimc_md_unregister_entities(fmd);
998 err_md:
999         v4l2_device_unregister(&fmd->v4l2_dev);
1000         return ret;
1001 }
1002
1003 static int fimc_md_remove(struct platform_device *pdev)
1004 {
1005         struct fimc_md *fmd = platform_get_drvdata(pdev);
1006
1007         if (!fmd)
1008                 return 0;
1009         device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
1010         fimc_md_unregister_entities(fmd);
1011         media_device_unregister(&fmd->media_dev);
1012         fimc_md_put_clocks(fmd);
1013         return 0;
1014 }
1015
1016 static struct platform_driver fimc_md_driver = {
1017         .probe          = fimc_md_probe,
1018         .remove         = fimc_md_remove,
1019         .driver = {
1020                 .name   = "s5p-fimc-md",
1021                 .owner  = THIS_MODULE,
1022         }
1023 };
1024
1025 static int __init fimc_md_init(void)
1026 {
1027         int ret;
1028
1029         request_module("s5p-csis");
1030         ret = fimc_register_driver();
1031         if (ret)
1032                 return ret;
1033
1034         return platform_driver_register(&fimc_md_driver);
1035 }
1036
1037 static void __exit fimc_md_exit(void)
1038 {
1039         platform_driver_unregister(&fimc_md_driver);
1040         fimc_unregister_driver();
1041 }
1042
1043 module_init(fimc_md_init);
1044 module_exit(fimc_md_exit);
1045
1046 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1047 MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
1048 MODULE_LICENSE("GPL");
1049 MODULE_VERSION("2.0.1");