2 * camera image capture (abstract) bus driver
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
6 * This driver provides an interface between platform-specific camera
7 * busses and camera devices. It should be used if the camera is
8 * connected not over a "proper" bus like PCI or USB, but over a
9 * special bus, like, for example, the Quick Capture interface on PXA270
10 * SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
11 * It can handle multiple cameras and / or multiple busses, which can
12 * be used, e.g., in stereo-vision applications.
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
19 #include <linux/device.h>
20 #include <linux/err.h>
21 #include <linux/i2c.h>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/mutex.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/vmalloc.h>
29 #include <media/soc_camera.h>
30 #include <media/v4l2-common.h>
31 #include <media/v4l2-ioctl.h>
32 #include <media/v4l2-dev.h>
33 #include <media/videobuf-core.h>
35 /* Default to VGA resolution */
36 #define DEFAULT_WIDTH 640
37 #define DEFAULT_HEIGHT 480
39 static LIST_HEAD(hosts
);
40 static LIST_HEAD(devices
);
41 static DEFINE_MUTEX(list_lock
); /* Protects the list of hosts */
43 const struct soc_camera_data_format
*soc_camera_format_by_fourcc(
44 struct soc_camera_device
*icd
, unsigned int fourcc
)
48 for (i
= 0; i
< icd
->num_formats
; i
++)
49 if (icd
->formats
[i
].fourcc
== fourcc
)
50 return icd
->formats
+ i
;
53 EXPORT_SYMBOL(soc_camera_format_by_fourcc
);
55 const struct soc_camera_format_xlate
*soc_camera_xlate_by_fourcc(
56 struct soc_camera_device
*icd
, unsigned int fourcc
)
60 for (i
= 0; i
< icd
->num_user_formats
; i
++)
61 if (icd
->user_formats
[i
].host_fmt
->fourcc
== fourcc
)
62 return icd
->user_formats
+ i
;
65 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc
);
68 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
69 * @icl: camera platform parameters
70 * @flags: flags to be inverted according to platform configuration
71 * @return: resulting flags
73 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link
*icl
,
78 /* If only one of the two polarities is supported, switch to the opposite */
79 if (icl
->flags
& SOCAM_SENSOR_INVERT_HSYNC
) {
80 f
= flags
& (SOCAM_HSYNC_ACTIVE_HIGH
| SOCAM_HSYNC_ACTIVE_LOW
);
81 if (f
== SOCAM_HSYNC_ACTIVE_HIGH
|| f
== SOCAM_HSYNC_ACTIVE_LOW
)
82 flags
^= SOCAM_HSYNC_ACTIVE_HIGH
| SOCAM_HSYNC_ACTIVE_LOW
;
85 if (icl
->flags
& SOCAM_SENSOR_INVERT_VSYNC
) {
86 f
= flags
& (SOCAM_VSYNC_ACTIVE_HIGH
| SOCAM_VSYNC_ACTIVE_LOW
);
87 if (f
== SOCAM_VSYNC_ACTIVE_HIGH
|| f
== SOCAM_VSYNC_ACTIVE_LOW
)
88 flags
^= SOCAM_VSYNC_ACTIVE_HIGH
| SOCAM_VSYNC_ACTIVE_LOW
;
91 if (icl
->flags
& SOCAM_SENSOR_INVERT_PCLK
) {
92 f
= flags
& (SOCAM_PCLK_SAMPLE_RISING
| SOCAM_PCLK_SAMPLE_FALLING
);
93 if (f
== SOCAM_PCLK_SAMPLE_RISING
|| f
== SOCAM_PCLK_SAMPLE_FALLING
)
94 flags
^= SOCAM_PCLK_SAMPLE_RISING
| SOCAM_PCLK_SAMPLE_FALLING
;
99 EXPORT_SYMBOL(soc_camera_apply_sensor_flags
);
101 static int soc_camera_try_fmt_vid_cap(struct file
*file
, void *priv
,
102 struct v4l2_format
*f
)
104 struct soc_camera_file
*icf
= file
->private_data
;
105 struct soc_camera_device
*icd
= icf
->icd
;
106 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
108 WARN_ON(priv
!= file
->private_data
);
110 /* limit format to hardware capabilities */
111 return ici
->ops
->try_fmt(icd
, f
);
114 static int soc_camera_enum_input(struct file
*file
, void *priv
,
115 struct v4l2_input
*inp
)
117 struct soc_camera_file
*icf
= file
->private_data
;
118 struct soc_camera_device
*icd
= icf
->icd
;
124 if (icd
->ops
->enum_input
)
125 ret
= icd
->ops
->enum_input(icd
, inp
);
127 /* default is camera */
128 inp
->type
= V4L2_INPUT_TYPE_CAMERA
;
129 inp
->std
= V4L2_STD_UNKNOWN
;
130 strcpy(inp
->name
, "Camera");
136 static int soc_camera_g_input(struct file
*file
, void *priv
, unsigned int *i
)
143 static int soc_camera_s_input(struct file
*file
, void *priv
, unsigned int i
)
151 static int soc_camera_s_std(struct file
*file
, void *priv
, v4l2_std_id
*a
)
153 struct soc_camera_file
*icf
= file
->private_data
;
154 struct soc_camera_device
*icd
= icf
->icd
;
155 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
157 return v4l2_subdev_call(sd
, core
, s_std
, *a
);
160 static int soc_camera_reqbufs(struct file
*file
, void *priv
,
161 struct v4l2_requestbuffers
*p
)
164 struct soc_camera_file
*icf
= file
->private_data
;
165 struct soc_camera_device
*icd
= icf
->icd
;
166 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
168 WARN_ON(priv
!= file
->private_data
);
170 ret
= videobuf_reqbufs(&icf
->vb_vidq
, p
);
174 return ici
->ops
->reqbufs(icf
, p
);
177 static int soc_camera_querybuf(struct file
*file
, void *priv
,
178 struct v4l2_buffer
*p
)
180 struct soc_camera_file
*icf
= file
->private_data
;
182 WARN_ON(priv
!= file
->private_data
);
184 return videobuf_querybuf(&icf
->vb_vidq
, p
);
187 static int soc_camera_qbuf(struct file
*file
, void *priv
,
188 struct v4l2_buffer
*p
)
190 struct soc_camera_file
*icf
= file
->private_data
;
192 WARN_ON(priv
!= file
->private_data
);
194 return videobuf_qbuf(&icf
->vb_vidq
, p
);
197 static int soc_camera_dqbuf(struct file
*file
, void *priv
,
198 struct v4l2_buffer
*p
)
200 struct soc_camera_file
*icf
= file
->private_data
;
202 WARN_ON(priv
!= file
->private_data
);
204 return videobuf_dqbuf(&icf
->vb_vidq
, p
, file
->f_flags
& O_NONBLOCK
);
207 /* Always entered with .video_lock held */
208 static int soc_camera_init_user_formats(struct soc_camera_device
*icd
)
210 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
211 int i
, fmts
= 0, ret
;
213 if (!ici
->ops
->get_formats
)
215 * Fallback mode - the host will have to serve all
216 * sensor-provided formats one-to-one to the user
218 fmts
= icd
->num_formats
;
221 * First pass - only count formats this host-sensor
222 * configuration can provide
224 for (i
= 0; i
< icd
->num_formats
; i
++) {
225 ret
= ici
->ops
->get_formats(icd
, i
, NULL
);
235 vmalloc(fmts
* sizeof(struct soc_camera_format_xlate
));
236 if (!icd
->user_formats
)
239 icd
->num_user_formats
= fmts
;
241 dev_dbg(&icd
->dev
, "Found %d supported formats.\n", fmts
);
243 /* Second pass - actually fill data formats */
245 for (i
= 0; i
< icd
->num_formats
; i
++)
246 if (!ici
->ops
->get_formats
) {
247 icd
->user_formats
[i
].host_fmt
= icd
->formats
+ i
;
248 icd
->user_formats
[i
].cam_fmt
= icd
->formats
+ i
;
249 icd
->user_formats
[i
].buswidth
= icd
->formats
[i
].depth
;
251 ret
= ici
->ops
->get_formats(icd
, i
,
252 &icd
->user_formats
[fmts
]);
258 icd
->current_fmt
= icd
->user_formats
[0].host_fmt
;
263 icd
->num_user_formats
= 0;
264 vfree(icd
->user_formats
);
268 /* Always entered with .video_lock held */
269 static void soc_camera_free_user_formats(struct soc_camera_device
*icd
)
271 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
273 if (ici
->ops
->put_formats
)
274 ici
->ops
->put_formats(icd
);
275 icd
->current_fmt
= NULL
;
276 icd
->num_user_formats
= 0;
277 vfree(icd
->user_formats
);
278 icd
->user_formats
= NULL
;
281 /* Called with .vb_lock held */
282 static int soc_camera_set_fmt(struct soc_camera_file
*icf
,
283 struct v4l2_format
*f
)
285 struct soc_camera_device
*icd
= icf
->icd
;
286 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
287 struct v4l2_pix_format
*pix
= &f
->fmt
.pix
;
290 /* We always call try_fmt() before set_fmt() or set_crop() */
291 ret
= ici
->ops
->try_fmt(icd
, f
);
295 ret
= ici
->ops
->set_fmt(icd
, f
);
298 } else if (!icd
->current_fmt
||
299 icd
->current_fmt
->fourcc
!= pix
->pixelformat
) {
301 "Host driver hasn't set up current format correctly!\n");
305 icd
->rect_current
.width
= pix
->width
;
306 icd
->rect_current
.height
= pix
->height
;
308 icd
->field
= pix
->field
;
310 if (f
->type
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
311 dev_warn(&icd
->dev
, "Attention! Wrong buf-type %d\n",
314 dev_dbg(&icd
->dev
, "set width: %d height: %d\n",
315 icd
->rect_current
.width
, icd
->rect_current
.height
);
317 /* set physical bus parameters */
318 return ici
->ops
->set_bus_param(icd
, pix
->pixelformat
);
321 static int soc_camera_open(struct file
*file
)
323 struct video_device
*vdev
= video_devdata(file
);
324 struct soc_camera_device
*icd
= container_of(vdev
->parent
, struct soc_camera_device
, dev
);
325 struct soc_camera_link
*icl
= to_soc_camera_link(icd
);
326 struct soc_camera_host
*ici
;
327 struct soc_camera_file
*icf
;
331 /* No device driver attached */
334 ici
= to_soc_camera_host(icd
->dev
.parent
);
336 icf
= vmalloc(sizeof(*icf
));
340 if (!try_module_get(ici
->ops
->owner
)) {
341 dev_err(&icd
->dev
, "Couldn't lock capture bus driver.\n");
346 /* Protect against icd->ops->remove() until we module_get() both drivers. */
347 mutex_lock(&icd
->video_lock
);
352 /* Now we really have to activate the camera */
353 if (icd
->use_count
== 1) {
354 /* Restore parameters before the last close() per V4L2 API */
355 struct v4l2_format f
= {
356 .type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
,
358 .width
= icd
->rect_current
.width
,
359 .height
= icd
->rect_current
.height
,
361 .pixelformat
= icd
->current_fmt
->fourcc
,
362 .colorspace
= icd
->current_fmt
->colorspace
,
367 ret
= icl
->power(icd
->pdev
, 1);
372 /* The camera could have been already on, try to reset */
374 icl
->reset(icd
->pdev
);
376 ret
= ici
->ops
->add(icd
);
378 dev_err(&icd
->dev
, "Couldn't activate the camera: %d\n", ret
);
382 if (icd
->ops
->init
) {
383 ret
= icd
->ops
->init(icd
);
388 /* Try to configure with default parameters */
389 ret
= soc_camera_set_fmt(icf
, &f
);
394 file
->private_data
= icf
;
395 dev_dbg(&icd
->dev
, "camera device open\n");
397 ici
->ops
->init_videobuf(&icf
->vb_vidq
, icd
);
399 mutex_unlock(&icd
->video_lock
);
404 * First five errors are entered with the .video_lock held
408 if (icd
->ops
->release
)
409 icd
->ops
->release(icd
);
411 ici
->ops
->remove(icd
);
414 icl
->power(icd
->pdev
, 0);
417 mutex_unlock(&icd
->video_lock
);
418 module_put(ici
->ops
->owner
);
424 static int soc_camera_close(struct file
*file
)
426 struct soc_camera_file
*icf
= file
->private_data
;
427 struct soc_camera_device
*icd
= icf
->icd
;
428 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
430 mutex_lock(&icd
->video_lock
);
432 if (!icd
->use_count
) {
433 struct soc_camera_link
*icl
= to_soc_camera_link(icd
);
435 if (icd
->ops
->release
)
436 icd
->ops
->release(icd
);
437 ici
->ops
->remove(icd
);
439 icl
->power(icd
->pdev
, 0);
442 mutex_unlock(&icd
->video_lock
);
444 module_put(ici
->ops
->owner
);
448 dev_dbg(&icd
->dev
, "camera device close\n");
453 static ssize_t
soc_camera_read(struct file
*file
, char __user
*buf
,
454 size_t count
, loff_t
*ppos
)
456 struct soc_camera_file
*icf
= file
->private_data
;
457 struct soc_camera_device
*icd
= icf
->icd
;
460 dev_err(&icd
->dev
, "camera device read not implemented\n");
465 static int soc_camera_mmap(struct file
*file
, struct vm_area_struct
*vma
)
467 struct soc_camera_file
*icf
= file
->private_data
;
468 struct soc_camera_device
*icd
= icf
->icd
;
471 dev_dbg(&icd
->dev
, "mmap called, vma=0x%08lx\n", (unsigned long)vma
);
473 err
= videobuf_mmap_mapper(&icf
->vb_vidq
, vma
);
475 dev_dbg(&icd
->dev
, "vma start=0x%08lx, size=%ld, ret=%d\n",
476 (unsigned long)vma
->vm_start
,
477 (unsigned long)vma
->vm_end
- (unsigned long)vma
->vm_start
,
483 static unsigned int soc_camera_poll(struct file
*file
, poll_table
*pt
)
485 struct soc_camera_file
*icf
= file
->private_data
;
486 struct soc_camera_device
*icd
= icf
->icd
;
487 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
489 if (list_empty(&icf
->vb_vidq
.stream
)) {
490 dev_err(&icd
->dev
, "Trying to poll with no queued buffers!\n");
494 return ici
->ops
->poll(file
, pt
);
497 static struct v4l2_file_operations soc_camera_fops
= {
498 .owner
= THIS_MODULE
,
499 .open
= soc_camera_open
,
500 .release
= soc_camera_close
,
501 .ioctl
= video_ioctl2
,
502 .read
= soc_camera_read
,
503 .mmap
= soc_camera_mmap
,
504 .poll
= soc_camera_poll
,
507 static int soc_camera_s_fmt_vid_cap(struct file
*file
, void *priv
,
508 struct v4l2_format
*f
)
510 struct soc_camera_file
*icf
= file
->private_data
;
511 struct soc_camera_device
*icd
= icf
->icd
;
514 WARN_ON(priv
!= file
->private_data
);
516 mutex_lock(&icf
->vb_vidq
.vb_lock
);
518 if (icf
->vb_vidq
.bufs
[0]) {
519 dev_err(&icd
->dev
, "S_FMT denied: queue initialised\n");
524 ret
= soc_camera_set_fmt(icf
, f
);
527 mutex_unlock(&icf
->vb_vidq
.vb_lock
);
532 static int soc_camera_enum_fmt_vid_cap(struct file
*file
, void *priv
,
533 struct v4l2_fmtdesc
*f
)
535 struct soc_camera_file
*icf
= file
->private_data
;
536 struct soc_camera_device
*icd
= icf
->icd
;
537 const struct soc_camera_data_format
*format
;
539 WARN_ON(priv
!= file
->private_data
);
541 if (f
->index
>= icd
->num_user_formats
)
544 format
= icd
->user_formats
[f
->index
].host_fmt
;
546 strlcpy(f
->description
, format
->name
, sizeof(f
->description
));
547 f
->pixelformat
= format
->fourcc
;
551 static int soc_camera_g_fmt_vid_cap(struct file
*file
, void *priv
,
552 struct v4l2_format
*f
)
554 struct soc_camera_file
*icf
= file
->private_data
;
555 struct soc_camera_device
*icd
= icf
->icd
;
556 struct v4l2_pix_format
*pix
= &f
->fmt
.pix
;
558 WARN_ON(priv
!= file
->private_data
);
560 pix
->width
= icd
->rect_current
.width
;
561 pix
->height
= icd
->rect_current
.height
;
562 pix
->field
= icf
->vb_vidq
.field
;
563 pix
->pixelformat
= icd
->current_fmt
->fourcc
;
564 pix
->bytesperline
= pix
->width
*
565 DIV_ROUND_UP(icd
->current_fmt
->depth
, 8);
566 pix
->sizeimage
= pix
->height
* pix
->bytesperline
;
567 dev_dbg(&icd
->dev
, "current_fmt->fourcc: 0x%08x\n",
568 icd
->current_fmt
->fourcc
);
572 static int soc_camera_querycap(struct file
*file
, void *priv
,
573 struct v4l2_capability
*cap
)
575 struct soc_camera_file
*icf
= file
->private_data
;
576 struct soc_camera_device
*icd
= icf
->icd
;
577 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
579 WARN_ON(priv
!= file
->private_data
);
581 strlcpy(cap
->driver
, ici
->drv_name
, sizeof(cap
->driver
));
582 return ici
->ops
->querycap(ici
, cap
);
585 static int soc_camera_streamon(struct file
*file
, void *priv
,
586 enum v4l2_buf_type i
)
588 struct soc_camera_file
*icf
= file
->private_data
;
589 struct soc_camera_device
*icd
= icf
->icd
;
590 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
593 WARN_ON(priv
!= file
->private_data
);
595 if (i
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
598 mutex_lock(&icd
->video_lock
);
600 v4l2_subdev_call(sd
, video
, s_stream
, 1);
602 /* This calls buf_queue from host driver's videobuf_queue_ops */
603 ret
= videobuf_streamon(&icf
->vb_vidq
);
605 mutex_unlock(&icd
->video_lock
);
610 static int soc_camera_streamoff(struct file
*file
, void *priv
,
611 enum v4l2_buf_type i
)
613 struct soc_camera_file
*icf
= file
->private_data
;
614 struct soc_camera_device
*icd
= icf
->icd
;
615 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
617 WARN_ON(priv
!= file
->private_data
);
619 if (i
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
622 mutex_lock(&icd
->video_lock
);
624 /* This calls buf_release from host driver's videobuf_queue_ops for all
625 * remaining buffers. When the last buffer is freed, stop capture */
626 videobuf_streamoff(&icf
->vb_vidq
);
628 v4l2_subdev_call(sd
, video
, s_stream
, 0);
630 mutex_unlock(&icd
->video_lock
);
635 static int soc_camera_queryctrl(struct file
*file
, void *priv
,
636 struct v4l2_queryctrl
*qc
)
638 struct soc_camera_file
*icf
= file
->private_data
;
639 struct soc_camera_device
*icd
= icf
->icd
;
640 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
643 WARN_ON(priv
!= file
->private_data
);
648 /* First check host controls */
649 for (i
= 0; i
< ici
->ops
->num_controls
; i
++)
650 if (qc
->id
== ici
->ops
->controls
[i
].id
) {
651 memcpy(qc
, &(ici
->ops
->controls
[i
]),
656 /* Then device controls */
657 for (i
= 0; i
< icd
->ops
->num_controls
; i
++)
658 if (qc
->id
== icd
->ops
->controls
[i
].id
) {
659 memcpy(qc
, &(icd
->ops
->controls
[i
]),
667 static int soc_camera_g_ctrl(struct file
*file
, void *priv
,
668 struct v4l2_control
*ctrl
)
670 struct soc_camera_file
*icf
= file
->private_data
;
671 struct soc_camera_device
*icd
= icf
->icd
;
672 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
673 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
676 WARN_ON(priv
!= file
->private_data
);
680 if (icd
->gain
== (unsigned short)~0)
682 ctrl
->value
= icd
->gain
;
684 case V4L2_CID_EXPOSURE
:
685 if (icd
->exposure
== (unsigned short)~0)
687 ctrl
->value
= icd
->exposure
;
691 if (ici
->ops
->get_ctrl
) {
692 ret
= ici
->ops
->get_ctrl(icd
, ctrl
);
693 if (ret
!= -ENOIOCTLCMD
)
697 return v4l2_subdev_call(sd
, core
, g_ctrl
, ctrl
);
700 static int soc_camera_s_ctrl(struct file
*file
, void *priv
,
701 struct v4l2_control
*ctrl
)
703 struct soc_camera_file
*icf
= file
->private_data
;
704 struct soc_camera_device
*icd
= icf
->icd
;
705 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
706 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
709 WARN_ON(priv
!= file
->private_data
);
711 if (ici
->ops
->set_ctrl
) {
712 ret
= ici
->ops
->set_ctrl(icd
, ctrl
);
713 if (ret
!= -ENOIOCTLCMD
)
717 return v4l2_subdev_call(sd
, core
, s_ctrl
, ctrl
);
720 static int soc_camera_cropcap(struct file
*file
, void *fh
,
721 struct v4l2_cropcap
*a
)
723 struct soc_camera_file
*icf
= file
->private_data
;
724 struct soc_camera_device
*icd
= icf
->icd
;
726 a
->type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
727 a
->bounds
= icd
->rect_max
;
728 a
->defrect
.left
= icd
->rect_max
.left
;
729 a
->defrect
.top
= icd
->rect_max
.top
;
730 a
->defrect
.width
= DEFAULT_WIDTH
;
731 a
->defrect
.height
= DEFAULT_HEIGHT
;
732 a
->pixelaspect
.numerator
= 1;
733 a
->pixelaspect
.denominator
= 1;
738 static int soc_camera_g_crop(struct file
*file
, void *fh
,
741 struct soc_camera_file
*icf
= file
->private_data
;
742 struct soc_camera_device
*icd
= icf
->icd
;
744 a
->type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
745 a
->c
= icd
->rect_current
;
751 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
752 * argument with the actual geometry, instead, the user shall use G_CROP to
753 * retrieve it. However, we expect camera host and client drivers to update
754 * the argument, which we then use internally, but do not return to the user.
756 static int soc_camera_s_crop(struct file
*file
, void *fh
,
759 struct soc_camera_file
*icf
= file
->private_data
;
760 struct soc_camera_device
*icd
= icf
->icd
;
761 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
762 struct v4l2_rect rect
= a
->c
;
765 if (a
->type
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
768 /* Cropping is allowed during a running capture, guard consistency */
769 mutex_lock(&icf
->vb_vidq
.vb_lock
);
771 /* Prohibit window size change with initialised buffers */
772 if (icf
->vb_vidq
.bufs
[0] && (rect
.width
!= icd
->rect_current
.width
||
773 rect
.height
!= icd
->rect_current
.height
)) {
775 "S_CROP denied: queue initialised and sizes differ\n");
780 if (rect
.width
> icd
->rect_max
.width
)
781 rect
.width
= icd
->rect_max
.width
;
783 if (rect
.width
< icd
->width_min
)
784 rect
.width
= icd
->width_min
;
786 if (rect
.height
> icd
->rect_max
.height
)
787 rect
.height
= icd
->rect_max
.height
;
789 if (rect
.height
< icd
->height_min
)
790 rect
.height
= icd
->height_min
;
792 if (rect
.width
+ rect
.left
> icd
->rect_max
.width
+ icd
->rect_max
.left
)
793 rect
.left
= icd
->rect_max
.width
+ icd
->rect_max
.left
-
796 if (rect
.height
+ rect
.top
> icd
->rect_max
.height
+ icd
->rect_max
.top
)
797 rect
.top
= icd
->rect_max
.height
+ icd
->rect_max
.top
-
800 ret
= ici
->ops
->set_crop(icd
, a
);
802 icd
->rect_current
= rect
;
805 mutex_unlock(&icf
->vb_vidq
.vb_lock
);
810 static int soc_camera_g_chip_ident(struct file
*file
, void *fh
,
811 struct v4l2_dbg_chip_ident
*id
)
813 struct soc_camera_file
*icf
= file
->private_data
;
814 struct soc_camera_device
*icd
= icf
->icd
;
815 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
817 return v4l2_subdev_call(sd
, core
, g_chip_ident
, id
);
820 #ifdef CONFIG_VIDEO_ADV_DEBUG
821 static int soc_camera_g_register(struct file
*file
, void *fh
,
822 struct v4l2_dbg_register
*reg
)
824 struct soc_camera_file
*icf
= file
->private_data
;
825 struct soc_camera_device
*icd
= icf
->icd
;
826 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
828 return v4l2_subdev_call(sd
, core
, g_register
, reg
);
831 static int soc_camera_s_register(struct file
*file
, void *fh
,
832 struct v4l2_dbg_register
*reg
)
834 struct soc_camera_file
*icf
= file
->private_data
;
835 struct soc_camera_device
*icd
= icf
->icd
;
836 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
838 return v4l2_subdev_call(sd
, core
, s_register
, reg
);
842 /* So far this function cannot fail */
843 static void scan_add_host(struct soc_camera_host
*ici
)
845 struct soc_camera_device
*icd
;
847 mutex_lock(&list_lock
);
849 list_for_each_entry(icd
, &devices
, list
) {
850 if (icd
->iface
== ici
->nr
) {
852 icd
->dev
.parent
= ici
->v4l2_dev
.dev
;
853 dev_set_name(&icd
->dev
, "%u-%u", icd
->iface
,
855 ret
= device_register(&icd
->dev
);
857 icd
->dev
.parent
= NULL
;
859 "Cannot register device: %d\n", ret
);
864 mutex_unlock(&list_lock
);
867 #ifdef CONFIG_I2C_BOARDINFO
868 static int soc_camera_init_i2c(struct soc_camera_device
*icd
,
869 struct soc_camera_link
*icl
)
871 struct i2c_client
*client
;
872 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
873 struct i2c_adapter
*adap
= i2c_get_adapter(icl
->i2c_adapter_id
);
874 struct v4l2_subdev
*subdev
;
879 dev_err(&icd
->dev
, "Cannot get I2C adapter #%d. No driver?\n",
880 icl
->i2c_adapter_id
);
884 icl
->board_info
->platform_data
= icd
;
886 subdev
= v4l2_i2c_new_subdev_board(&ici
->v4l2_dev
, adap
,
887 icl
->module_name
, icl
->board_info
, NULL
);
893 subdev
->grp_id
= (__u32
)icd
;
894 client
= subdev
->priv
;
896 /* Use to_i2c_client(dev) to recover the i2c client */
897 dev_set_drvdata(&icd
->dev
, &client
->dev
);
901 i2c_put_adapter(adap
);
906 static void soc_camera_free_i2c(struct soc_camera_device
*icd
)
908 struct i2c_client
*client
=
909 to_i2c_client(to_soc_camera_control(icd
));
910 dev_set_drvdata(&icd
->dev
, NULL
);
911 v4l2_device_unregister_subdev(i2c_get_clientdata(client
));
912 i2c_unregister_device(client
);
913 i2c_put_adapter(client
->adapter
);
916 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
917 #define soc_camera_free_i2c(icd) do {} while (0)
920 static int soc_camera_video_start(struct soc_camera_device
*icd
);
921 static int video_dev_create(struct soc_camera_device
*icd
);
922 /* Called during host-driver probe */
923 static int soc_camera_probe(struct device
*dev
)
925 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
926 struct soc_camera_host
*ici
= to_soc_camera_host(dev
->parent
);
927 struct soc_camera_link
*icl
= to_soc_camera_link(icd
);
928 struct device
*control
= NULL
;
931 dev_info(dev
, "Probing %s\n", dev_name(dev
));
934 ret
= icl
->power(icd
->pdev
, 1);
937 "Platform failed to power-on the camera.\n");
942 /* The camera could have been already on, try to reset */
944 icl
->reset(icd
->pdev
);
946 ret
= ici
->ops
->add(icd
);
950 /* Must have icd->vdev before registering the device */
951 ret
= video_dev_create(icd
);
955 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
956 if (icl
->board_info
) {
957 ret
= soc_camera_init_i2c(icd
, icl
);
960 } else if (!icl
->add_device
|| !icl
->del_device
) {
964 if (icl
->module_name
)
965 ret
= request_module(icl
->module_name
);
967 ret
= icl
->add_device(icl
, &icd
->dev
);
971 /* FIXME: this is racy, have to use driver-binding notification */
972 control
= to_soc_camera_control(icd
);
973 if (!control
|| !control
->driver
|| !dev_get_drvdata(control
) ||
974 !try_module_get(control
->driver
->owner
)) {
975 icl
->del_device(icl
);
980 /* At this point client .probe() should have run already */
981 ret
= soc_camera_init_user_formats(icd
);
985 icd
->rect_current
= icd
->rect_max
;
986 icd
->field
= V4L2_FIELD_ANY
;
988 /* ..._video_start() will create a device node, so we have to protect */
989 mutex_lock(&icd
->video_lock
);
991 ret
= soc_camera_video_start(icd
);
995 /* Do we have to sysfs_remove_link() before device_unregister()? */
996 if (to_soc_camera_control(icd
) &&
997 sysfs_create_link(&icd
->dev
.kobj
, &to_soc_camera_control(icd
)->kobj
,
999 dev_warn(&icd
->dev
, "Failed creating the control symlink\n");
1001 ici
->ops
->remove(icd
);
1004 icl
->power(icd
->pdev
, 0);
1006 mutex_unlock(&icd
->video_lock
);
1011 mutex_unlock(&icd
->video_lock
);
1012 soc_camera_free_user_formats(icd
);
1014 if (icl
->board_info
) {
1015 soc_camera_free_i2c(icd
);
1017 icl
->del_device(icl
);
1018 module_put(control
->driver
->owner
);
1022 video_device_release(icd
->vdev
);
1024 ici
->ops
->remove(icd
);
1027 icl
->power(icd
->pdev
, 0);
1032 /* This is called on device_unregister, which only means we have to disconnect
1033 * from the host, but not remove ourselves from the device list */
1034 static int soc_camera_remove(struct device
*dev
)
1036 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
1037 struct soc_camera_link
*icl
= to_soc_camera_link(icd
);
1038 struct video_device
*vdev
= icd
->vdev
;
1040 BUG_ON(!dev
->parent
);
1043 mutex_lock(&icd
->video_lock
);
1044 video_unregister_device(vdev
);
1046 mutex_unlock(&icd
->video_lock
);
1049 if (icl
->board_info
) {
1050 soc_camera_free_i2c(icd
);
1052 struct device_driver
*drv
= to_soc_camera_control(icd
) ?
1053 to_soc_camera_control(icd
)->driver
: NULL
;
1055 icl
->del_device(icl
);
1056 module_put(drv
->owner
);
1059 soc_camera_free_user_formats(icd
);
1064 static int soc_camera_suspend(struct device
*dev
, pm_message_t state
)
1066 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
1067 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
1070 if (ici
->ops
->suspend
)
1071 ret
= ici
->ops
->suspend(icd
, state
);
1076 static int soc_camera_resume(struct device
*dev
)
1078 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
1079 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
1082 if (ici
->ops
->resume
)
1083 ret
= ici
->ops
->resume(icd
);
1088 static struct bus_type soc_camera_bus_type
= {
1089 .name
= "soc-camera",
1090 .probe
= soc_camera_probe
,
1091 .remove
= soc_camera_remove
,
1092 .suspend
= soc_camera_suspend
,
1093 .resume
= soc_camera_resume
,
1096 static struct device_driver ic_drv
= {
1098 .bus
= &soc_camera_bus_type
,
1099 .owner
= THIS_MODULE
,
1102 static void dummy_release(struct device
*dev
)
1106 int soc_camera_host_register(struct soc_camera_host
*ici
)
1108 struct soc_camera_host
*ix
;
1111 if (!ici
|| !ici
->ops
||
1112 !ici
->ops
->try_fmt
||
1113 !ici
->ops
->set_fmt
||
1114 !ici
->ops
->set_crop
||
1115 !ici
->ops
->set_bus_param
||
1116 !ici
->ops
->querycap
||
1117 !ici
->ops
->init_videobuf
||
1118 !ici
->ops
->reqbufs
||
1120 !ici
->ops
->remove
||
1125 mutex_lock(&list_lock
);
1126 list_for_each_entry(ix
, &hosts
, list
) {
1127 if (ix
->nr
== ici
->nr
) {
1133 ret
= v4l2_device_register(ici
->v4l2_dev
.dev
, &ici
->v4l2_dev
);
1137 list_add_tail(&ici
->list
, &hosts
);
1138 mutex_unlock(&list_lock
);
1145 mutex_unlock(&list_lock
);
1148 EXPORT_SYMBOL(soc_camera_host_register
);
1150 /* Unregister all clients! */
1151 void soc_camera_host_unregister(struct soc_camera_host
*ici
)
1153 struct soc_camera_device
*icd
;
1155 mutex_lock(&list_lock
);
1157 list_del(&ici
->list
);
1159 list_for_each_entry(icd
, &devices
, list
) {
1160 if (icd
->iface
== ici
->nr
) {
1161 /* The bus->remove will be called */
1162 device_unregister(&icd
->dev
);
1163 /* Not before device_unregister(), .remove
1164 * needs parent to call ici->ops->remove() */
1165 icd
->dev
.parent
= NULL
;
1167 /* If the host module is loaded again, device_register()
1168 * would complain "already initialised" */
1169 memset(&icd
->dev
.kobj
, 0, sizeof(icd
->dev
.kobj
));
1173 mutex_unlock(&list_lock
);
1175 v4l2_device_unregister(&ici
->v4l2_dev
);
1177 EXPORT_SYMBOL(soc_camera_host_unregister
);
1179 /* Image capture device */
1180 static int soc_camera_device_register(struct soc_camera_device
*icd
)
1182 struct soc_camera_device
*ix
;
1185 for (i
= 0; i
< 256 && num
< 0; i
++) {
1187 /* Check if this index is available on this interface */
1188 list_for_each_entry(ix
, &devices
, list
) {
1189 if (ix
->iface
== icd
->iface
&& ix
->devnum
== i
) {
1197 /* ok, we have 256 cameras on this host...
1198 * man, stay reasonable... */
1202 icd
->dev
.bus
= &soc_camera_bus_type
;
1204 icd
->dev
.release
= dummy_release
;
1206 icd
->host_priv
= NULL
;
1207 mutex_init(&icd
->video_lock
);
1209 list_add_tail(&icd
->list
, &devices
);
1214 static void soc_camera_device_unregister(struct soc_camera_device
*icd
)
1216 list_del(&icd
->list
);
1219 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops
= {
1220 .vidioc_querycap
= soc_camera_querycap
,
1221 .vidioc_g_fmt_vid_cap
= soc_camera_g_fmt_vid_cap
,
1222 .vidioc_enum_fmt_vid_cap
= soc_camera_enum_fmt_vid_cap
,
1223 .vidioc_s_fmt_vid_cap
= soc_camera_s_fmt_vid_cap
,
1224 .vidioc_enum_input
= soc_camera_enum_input
,
1225 .vidioc_g_input
= soc_camera_g_input
,
1226 .vidioc_s_input
= soc_camera_s_input
,
1227 .vidioc_s_std
= soc_camera_s_std
,
1228 .vidioc_reqbufs
= soc_camera_reqbufs
,
1229 .vidioc_try_fmt_vid_cap
= soc_camera_try_fmt_vid_cap
,
1230 .vidioc_querybuf
= soc_camera_querybuf
,
1231 .vidioc_qbuf
= soc_camera_qbuf
,
1232 .vidioc_dqbuf
= soc_camera_dqbuf
,
1233 .vidioc_streamon
= soc_camera_streamon
,
1234 .vidioc_streamoff
= soc_camera_streamoff
,
1235 .vidioc_queryctrl
= soc_camera_queryctrl
,
1236 .vidioc_g_ctrl
= soc_camera_g_ctrl
,
1237 .vidioc_s_ctrl
= soc_camera_s_ctrl
,
1238 .vidioc_cropcap
= soc_camera_cropcap
,
1239 .vidioc_g_crop
= soc_camera_g_crop
,
1240 .vidioc_s_crop
= soc_camera_s_crop
,
1241 .vidioc_g_chip_ident
= soc_camera_g_chip_ident
,
1242 #ifdef CONFIG_VIDEO_ADV_DEBUG
1243 .vidioc_g_register
= soc_camera_g_register
,
1244 .vidioc_s_register
= soc_camera_s_register
,
1248 static int video_dev_create(struct soc_camera_device
*icd
)
1250 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
1251 struct video_device
*vdev
= video_device_alloc();
1256 strlcpy(vdev
->name
, ici
->drv_name
, sizeof(vdev
->name
));
1258 vdev
->parent
= &icd
->dev
;
1259 vdev
->current_norm
= V4L2_STD_UNKNOWN
;
1260 vdev
->fops
= &soc_camera_fops
;
1261 vdev
->ioctl_ops
= &soc_camera_ioctl_ops
;
1262 vdev
->release
= video_device_release
;
1264 vdev
->tvnorms
= V4L2_STD_UNKNOWN
;
1272 * Called from soc_camera_probe() above (with .video_lock held???)
1274 static int soc_camera_video_start(struct soc_camera_device
*icd
)
1276 const struct v4l2_queryctrl
*qctrl
;
1279 if (!icd
->dev
.parent
)
1283 !icd
->ops
->query_bus_param
||
1284 !icd
->ops
->set_bus_param
)
1287 ret
= video_register_device(icd
->vdev
, VFL_TYPE_GRABBER
,
1290 dev_err(&icd
->dev
, "video_register_device failed: %d\n", ret
);
1294 qctrl
= soc_camera_find_qctrl(icd
->ops
, V4L2_CID_GAIN
);
1295 icd
->gain
= qctrl
? qctrl
->default_value
: (unsigned short)~0;
1296 qctrl
= soc_camera_find_qctrl(icd
->ops
, V4L2_CID_EXPOSURE
);
1297 icd
->exposure
= qctrl
? qctrl
->default_value
: (unsigned short)~0;
1302 static int __devinit
soc_camera_pdrv_probe(struct platform_device
*pdev
)
1304 struct soc_camera_link
*icl
= pdev
->dev
.platform_data
;
1305 struct soc_camera_device
*icd
;
1311 icd
= kzalloc(sizeof(*icd
), GFP_KERNEL
);
1315 icd
->iface
= icl
->bus_id
;
1316 icd
->pdev
= &pdev
->dev
;
1317 platform_set_drvdata(pdev
, icd
);
1318 icd
->dev
.platform_data
= icl
;
1320 ret
= soc_camera_device_register(icd
);
1332 /* Only called on rmmod for each platform device, since they are not
1333 * hot-pluggable. Now we know, that all our users - hosts and devices have
1334 * been unloaded already */
1335 static int __devexit
soc_camera_pdrv_remove(struct platform_device
*pdev
)
1337 struct soc_camera_device
*icd
= platform_get_drvdata(pdev
);
1342 soc_camera_device_unregister(icd
);
1349 static struct platform_driver __refdata soc_camera_pdrv
= {
1350 .remove
= __devexit_p(soc_camera_pdrv_remove
),
1352 .name
= "soc-camera-pdrv",
1353 .owner
= THIS_MODULE
,
1357 static int __init
soc_camera_init(void)
1359 int ret
= bus_register(&soc_camera_bus_type
);
1362 ret
= driver_register(&ic_drv
);
1366 ret
= platform_driver_probe(&soc_camera_pdrv
, soc_camera_pdrv_probe
);
1373 driver_unregister(&ic_drv
);
1375 bus_unregister(&soc_camera_bus_type
);
1379 static void __exit
soc_camera_exit(void)
1381 platform_driver_unregister(&soc_camera_pdrv
);
1382 driver_unregister(&ic_drv
);
1383 bus_unregister(&soc_camera_bus_type
);
1386 module_init(soc_camera_init
);
1387 module_exit(soc_camera_exit
);
1389 MODULE_DESCRIPTION("Image capture bus driver");
1390 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1391 MODULE_LICENSE("GPL");
1392 MODULE_ALIAS("platform:soc-camera-pdrv");