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/slab.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/vmalloc.h>
31 #include <media/soc_camera.h>
32 #include <media/v4l2-common.h>
33 #include <media/v4l2-ioctl.h>
34 #include <media/v4l2-dev.h>
35 #include <media/videobuf-core.h>
36 #include <media/soc_mediabus.h>
38 /* Default to VGA resolution */
39 #define DEFAULT_WIDTH 640
40 #define DEFAULT_HEIGHT 480
42 static LIST_HEAD(hosts
);
43 static LIST_HEAD(devices
);
44 static DEFINE_MUTEX(list_lock
); /* Protects the list of hosts */
46 const struct soc_camera_format_xlate
*soc_camera_xlate_by_fourcc(
47 struct soc_camera_device
*icd
, unsigned int fourcc
)
51 for (i
= 0; i
< icd
->num_user_formats
; i
++)
52 if (icd
->user_formats
[i
].host_fmt
->fourcc
== fourcc
)
53 return icd
->user_formats
+ i
;
56 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc
);
59 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
60 * @icl: camera platform parameters
61 * @flags: flags to be inverted according to platform configuration
62 * @return: resulting flags
64 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link
*icl
,
69 /* If only one of the two polarities is supported, switch to the opposite */
70 if (icl
->flags
& SOCAM_SENSOR_INVERT_HSYNC
) {
71 f
= flags
& (SOCAM_HSYNC_ACTIVE_HIGH
| SOCAM_HSYNC_ACTIVE_LOW
);
72 if (f
== SOCAM_HSYNC_ACTIVE_HIGH
|| f
== SOCAM_HSYNC_ACTIVE_LOW
)
73 flags
^= SOCAM_HSYNC_ACTIVE_HIGH
| SOCAM_HSYNC_ACTIVE_LOW
;
76 if (icl
->flags
& SOCAM_SENSOR_INVERT_VSYNC
) {
77 f
= flags
& (SOCAM_VSYNC_ACTIVE_HIGH
| SOCAM_VSYNC_ACTIVE_LOW
);
78 if (f
== SOCAM_VSYNC_ACTIVE_HIGH
|| f
== SOCAM_VSYNC_ACTIVE_LOW
)
79 flags
^= SOCAM_VSYNC_ACTIVE_HIGH
| SOCAM_VSYNC_ACTIVE_LOW
;
82 if (icl
->flags
& SOCAM_SENSOR_INVERT_PCLK
) {
83 f
= flags
& (SOCAM_PCLK_SAMPLE_RISING
| SOCAM_PCLK_SAMPLE_FALLING
);
84 if (f
== SOCAM_PCLK_SAMPLE_RISING
|| f
== SOCAM_PCLK_SAMPLE_FALLING
)
85 flags
^= SOCAM_PCLK_SAMPLE_RISING
| SOCAM_PCLK_SAMPLE_FALLING
;
90 EXPORT_SYMBOL(soc_camera_apply_sensor_flags
);
92 static int soc_camera_try_fmt_vid_cap(struct file
*file
, void *priv
,
93 struct v4l2_format
*f
)
95 struct soc_camera_device
*icd
= file
->private_data
;
96 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
98 WARN_ON(priv
!= file
->private_data
);
100 /* limit format to hardware capabilities */
101 return ici
->ops
->try_fmt(icd
, f
);
104 static int soc_camera_enum_input(struct file
*file
, void *priv
,
105 struct v4l2_input
*inp
)
107 struct soc_camera_device
*icd
= file
->private_data
;
113 if (icd
->ops
->enum_input
)
114 ret
= icd
->ops
->enum_input(icd
, inp
);
116 /* default is camera */
117 inp
->type
= V4L2_INPUT_TYPE_CAMERA
;
118 inp
->std
= V4L2_STD_UNKNOWN
;
119 strcpy(inp
->name
, "Camera");
125 static int soc_camera_g_input(struct file
*file
, void *priv
, unsigned int *i
)
132 static int soc_camera_s_input(struct file
*file
, void *priv
, unsigned int i
)
140 static int soc_camera_s_std(struct file
*file
, void *priv
, v4l2_std_id
*a
)
142 struct soc_camera_device
*icd
= file
->private_data
;
143 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
145 return v4l2_subdev_call(sd
, core
, s_std
, *a
);
148 static int soc_camera_reqbufs(struct file
*file
, void *priv
,
149 struct v4l2_requestbuffers
*p
)
152 struct soc_camera_device
*icd
= file
->private_data
;
153 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
155 WARN_ON(priv
!= file
->private_data
);
157 if (icd
->streamer
&& icd
->streamer
!= file
)
160 ret
= videobuf_reqbufs(&icd
->vb_vidq
, p
);
164 ret
= ici
->ops
->reqbufs(icd
, p
);
165 if (!ret
&& !icd
->streamer
)
166 icd
->streamer
= file
;
171 static int soc_camera_querybuf(struct file
*file
, void *priv
,
172 struct v4l2_buffer
*p
)
174 struct soc_camera_device
*icd
= file
->private_data
;
176 WARN_ON(priv
!= file
->private_data
);
178 return videobuf_querybuf(&icd
->vb_vidq
, p
);
181 static int soc_camera_qbuf(struct file
*file
, void *priv
,
182 struct v4l2_buffer
*p
)
184 struct soc_camera_device
*icd
= file
->private_data
;
186 WARN_ON(priv
!= file
->private_data
);
188 if (icd
->streamer
!= file
)
191 return videobuf_qbuf(&icd
->vb_vidq
, p
);
194 static int soc_camera_dqbuf(struct file
*file
, void *priv
,
195 struct v4l2_buffer
*p
)
197 struct soc_camera_device
*icd
= file
->private_data
;
199 WARN_ON(priv
!= file
->private_data
);
201 if (icd
->streamer
!= file
)
204 return videobuf_dqbuf(&icd
->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 v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
211 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
212 unsigned int i
, fmts
= 0, raw_fmts
= 0;
214 enum v4l2_mbus_pixelcode code
;
216 while (!v4l2_subdev_call(sd
, video
, enum_mbus_fmt
, raw_fmts
, &code
))
219 if (!ici
->ops
->get_formats
)
221 * Fallback mode - the host will have to serve all
222 * sensor-provided formats one-to-one to the user
227 * First pass - only count formats this host-sensor
228 * configuration can provide
230 for (i
= 0; i
< raw_fmts
; i
++) {
231 ret
= ici
->ops
->get_formats(icd
, i
, NULL
);
241 vmalloc(fmts
* sizeof(struct soc_camera_format_xlate
));
242 if (!icd
->user_formats
)
245 icd
->num_user_formats
= fmts
;
247 dev_dbg(&icd
->dev
, "Found %d supported formats.\n", fmts
);
249 /* Second pass - actually fill data formats */
251 for (i
= 0; i
< raw_fmts
; i
++)
252 if (!ici
->ops
->get_formats
) {
253 v4l2_subdev_call(sd
, video
, enum_mbus_fmt
, i
, &code
);
254 icd
->user_formats
[i
].host_fmt
=
255 soc_mbus_get_fmtdesc(code
);
256 icd
->user_formats
[i
].code
= code
;
258 ret
= ici
->ops
->get_formats(icd
, i
,
259 &icd
->user_formats
[fmts
]);
265 icd
->current_fmt
= &icd
->user_formats
[0];
270 icd
->num_user_formats
= 0;
271 vfree(icd
->user_formats
);
275 /* Always entered with .video_lock held */
276 static void soc_camera_free_user_formats(struct soc_camera_device
*icd
)
278 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
280 if (ici
->ops
->put_formats
)
281 ici
->ops
->put_formats(icd
);
282 icd
->current_fmt
= NULL
;
283 icd
->num_user_formats
= 0;
284 vfree(icd
->user_formats
);
285 icd
->user_formats
= NULL
;
288 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
291 /* Called with .vb_lock held, or from the first open(2), see comment there */
292 static int soc_camera_set_fmt(struct soc_camera_device
*icd
,
293 struct v4l2_format
*f
)
295 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
296 struct v4l2_pix_format
*pix
= &f
->fmt
.pix
;
299 dev_dbg(&icd
->dev
, "S_FMT(%c%c%c%c, %ux%u)\n",
300 pixfmtstr(pix
->pixelformat
), pix
->width
, pix
->height
);
302 /* We always call try_fmt() before set_fmt() or set_crop() */
303 ret
= ici
->ops
->try_fmt(icd
, f
);
307 ret
= ici
->ops
->set_fmt(icd
, f
);
310 } else if (!icd
->current_fmt
||
311 icd
->current_fmt
->host_fmt
->fourcc
!= pix
->pixelformat
) {
313 "Host driver hasn't set up current format correctly!\n");
317 icd
->user_width
= pix
->width
;
318 icd
->user_height
= pix
->height
;
319 icd
->colorspace
= pix
->colorspace
;
321 icd
->field
= pix
->field
;
323 if (f
->type
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
324 dev_warn(&icd
->dev
, "Attention! Wrong buf-type %d\n",
327 dev_dbg(&icd
->dev
, "set width: %d height: %d\n",
328 icd
->user_width
, icd
->user_height
);
330 /* set physical bus parameters */
331 return ici
->ops
->set_bus_param(icd
, pix
->pixelformat
);
334 static int soc_camera_open(struct file
*file
)
336 struct video_device
*vdev
= video_devdata(file
);
337 struct soc_camera_device
*icd
= container_of(vdev
->parent
,
338 struct soc_camera_device
,
340 struct soc_camera_link
*icl
= to_soc_camera_link(icd
);
341 struct soc_camera_host
*ici
;
345 /* No device driver attached */
348 ici
= to_soc_camera_host(icd
->dev
.parent
);
350 if (!try_module_get(ici
->ops
->owner
)) {
351 dev_err(&icd
->dev
, "Couldn't lock capture bus driver.\n");
357 /* Now we really have to activate the camera */
358 if (icd
->use_count
== 1) {
359 /* Restore parameters before the last close() per V4L2 API */
360 struct v4l2_format f
= {
361 .type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
,
363 .width
= icd
->user_width
,
364 .height
= icd
->user_height
,
366 .colorspace
= icd
->colorspace
,
368 icd
->current_fmt
->host_fmt
->fourcc
,
373 ret
= icl
->power(icd
->pdev
, 1);
378 /* The camera could have been already on, try to reset */
380 icl
->reset(icd
->pdev
);
382 ret
= ici
->ops
->add(icd
);
384 dev_err(&icd
->dev
, "Couldn't activate the camera: %d\n", ret
);
388 pm_runtime_enable(&icd
->vdev
->dev
);
389 ret
= pm_runtime_resume(&icd
->vdev
->dev
);
390 if (ret
< 0 && ret
!= -ENOSYS
)
394 * Try to configure with default parameters. Notice: this is the
395 * very first open, so, we cannot race against other calls,
396 * apart from someone else calling open() simultaneously, but
397 * .video_lock is protecting us against it.
399 ret
= soc_camera_set_fmt(icd
, &f
);
403 ici
->ops
->init_videobuf(&icd
->vb_vidq
, icd
);
406 file
->private_data
= icd
;
407 dev_dbg(&icd
->dev
, "camera device open\n");
412 * First four errors are entered with the .video_lock held
416 pm_runtime_disable(&icd
->vdev
->dev
);
418 ici
->ops
->remove(icd
);
421 icl
->power(icd
->pdev
, 0);
424 module_put(ici
->ops
->owner
);
429 static int soc_camera_close(struct file
*file
)
431 struct soc_camera_device
*icd
= file
->private_data
;
432 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
435 if (!icd
->use_count
) {
436 struct soc_camera_link
*icl
= to_soc_camera_link(icd
);
438 pm_runtime_suspend(&icd
->vdev
->dev
);
439 pm_runtime_disable(&icd
->vdev
->dev
);
441 ici
->ops
->remove(icd
);
444 icl
->power(icd
->pdev
, 0);
447 if (icd
->streamer
== file
)
448 icd
->streamer
= NULL
;
450 module_put(ici
->ops
->owner
);
452 dev_dbg(&icd
->dev
, "camera device close\n");
457 static ssize_t
soc_camera_read(struct file
*file
, char __user
*buf
,
458 size_t count
, loff_t
*ppos
)
460 struct soc_camera_device
*icd
= file
->private_data
;
463 dev_err(&icd
->dev
, "camera device read not implemented\n");
468 static int soc_camera_mmap(struct file
*file
, struct vm_area_struct
*vma
)
470 struct soc_camera_device
*icd
= file
->private_data
;
473 dev_dbg(&icd
->dev
, "mmap called, vma=0x%08lx\n", (unsigned long)vma
);
475 if (icd
->streamer
!= file
)
478 err
= videobuf_mmap_mapper(&icd
->vb_vidq
, vma
);
480 dev_dbg(&icd
->dev
, "vma start=0x%08lx, size=%ld, ret=%d\n",
481 (unsigned long)vma
->vm_start
,
482 (unsigned long)vma
->vm_end
- (unsigned long)vma
->vm_start
,
488 static unsigned int soc_camera_poll(struct file
*file
, poll_table
*pt
)
490 struct soc_camera_device
*icd
= file
->private_data
;
491 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
493 if (icd
->streamer
!= file
)
496 if (list_empty(&icd
->vb_vidq
.stream
)) {
497 dev_err(&icd
->dev
, "Trying to poll with no queued buffers!\n");
501 return ici
->ops
->poll(file
, pt
);
504 static struct v4l2_file_operations soc_camera_fops
= {
505 .owner
= THIS_MODULE
,
506 .open
= soc_camera_open
,
507 .release
= soc_camera_close
,
508 .unlocked_ioctl
= video_ioctl2
,
509 .read
= soc_camera_read
,
510 .mmap
= soc_camera_mmap
,
511 .poll
= soc_camera_poll
,
514 static int soc_camera_s_fmt_vid_cap(struct file
*file
, void *priv
,
515 struct v4l2_format
*f
)
517 struct soc_camera_device
*icd
= file
->private_data
;
520 WARN_ON(priv
!= file
->private_data
);
522 if (icd
->streamer
&& icd
->streamer
!= file
)
525 if (icd
->vb_vidq
.bufs
[0]) {
526 dev_err(&icd
->dev
, "S_FMT denied: queue initialised\n");
530 ret
= soc_camera_set_fmt(icd
, f
);
532 if (!ret
&& !icd
->streamer
)
533 icd
->streamer
= file
;
538 static int soc_camera_enum_fmt_vid_cap(struct file
*file
, void *priv
,
539 struct v4l2_fmtdesc
*f
)
541 struct soc_camera_device
*icd
= file
->private_data
;
542 const struct soc_mbus_pixelfmt
*format
;
544 WARN_ON(priv
!= file
->private_data
);
546 if (f
->index
>= icd
->num_user_formats
)
549 format
= icd
->user_formats
[f
->index
].host_fmt
;
552 strlcpy(f
->description
, format
->name
, sizeof(f
->description
));
553 f
->pixelformat
= format
->fourcc
;
557 static int soc_camera_g_fmt_vid_cap(struct file
*file
, void *priv
,
558 struct v4l2_format
*f
)
560 struct soc_camera_device
*icd
= file
->private_data
;
561 struct v4l2_pix_format
*pix
= &f
->fmt
.pix
;
563 WARN_ON(priv
!= file
->private_data
);
565 pix
->width
= icd
->user_width
;
566 pix
->height
= icd
->user_height
;
567 pix
->field
= icd
->vb_vidq
.field
;
568 pix
->pixelformat
= icd
->current_fmt
->host_fmt
->fourcc
;
569 pix
->bytesperline
= soc_mbus_bytes_per_line(pix
->width
,
570 icd
->current_fmt
->host_fmt
);
571 pix
->colorspace
= icd
->colorspace
;
572 if (pix
->bytesperline
< 0)
573 return pix
->bytesperline
;
574 pix
->sizeimage
= pix
->height
* pix
->bytesperline
;
575 dev_dbg(&icd
->dev
, "current_fmt->fourcc: 0x%08x\n",
576 icd
->current_fmt
->host_fmt
->fourcc
);
580 static int soc_camera_querycap(struct file
*file
, void *priv
,
581 struct v4l2_capability
*cap
)
583 struct soc_camera_device
*icd
= file
->private_data
;
584 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
586 WARN_ON(priv
!= file
->private_data
);
588 strlcpy(cap
->driver
, ici
->drv_name
, sizeof(cap
->driver
));
589 return ici
->ops
->querycap(ici
, cap
);
592 static int soc_camera_streamon(struct file
*file
, void *priv
,
593 enum v4l2_buf_type i
)
595 struct soc_camera_device
*icd
= file
->private_data
;
596 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
599 WARN_ON(priv
!= file
->private_data
);
601 if (i
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
604 if (icd
->streamer
!= file
)
607 v4l2_subdev_call(sd
, video
, s_stream
, 1);
609 /* This calls buf_queue from host driver's videobuf_queue_ops */
610 ret
= videobuf_streamon(&icd
->vb_vidq
);
615 static int soc_camera_streamoff(struct file
*file
, void *priv
,
616 enum v4l2_buf_type i
)
618 struct soc_camera_device
*icd
= file
->private_data
;
619 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
621 WARN_ON(priv
!= file
->private_data
);
623 if (i
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
626 if (icd
->streamer
!= file
)
630 * This calls buf_release from host driver's videobuf_queue_ops for all
631 * remaining buffers. When the last buffer is freed, stop capture
633 videobuf_streamoff(&icd
->vb_vidq
);
635 v4l2_subdev_call(sd
, video
, s_stream
, 0);
640 static int soc_camera_queryctrl(struct file
*file
, void *priv
,
641 struct v4l2_queryctrl
*qc
)
643 struct soc_camera_device
*icd
= file
->private_data
;
644 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
647 WARN_ON(priv
!= file
->private_data
);
652 /* First check host controls */
653 for (i
= 0; i
< ici
->ops
->num_controls
; i
++)
654 if (qc
->id
== ici
->ops
->controls
[i
].id
) {
655 memcpy(qc
, &(ici
->ops
->controls
[i
]),
660 /* Then device controls */
661 for (i
= 0; i
< icd
->ops
->num_controls
; i
++)
662 if (qc
->id
== icd
->ops
->controls
[i
].id
) {
663 memcpy(qc
, &(icd
->ops
->controls
[i
]),
671 static int soc_camera_g_ctrl(struct file
*file
, void *priv
,
672 struct v4l2_control
*ctrl
)
674 struct soc_camera_device
*icd
= file
->private_data
;
675 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
676 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
679 WARN_ON(priv
!= file
->private_data
);
681 if (ici
->ops
->get_ctrl
) {
682 ret
= ici
->ops
->get_ctrl(icd
, ctrl
);
683 if (ret
!= -ENOIOCTLCMD
)
687 return v4l2_subdev_call(sd
, core
, g_ctrl
, ctrl
);
690 static int soc_camera_s_ctrl(struct file
*file
, void *priv
,
691 struct v4l2_control
*ctrl
)
693 struct soc_camera_device
*icd
= file
->private_data
;
694 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
695 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
698 WARN_ON(priv
!= file
->private_data
);
700 if (ici
->ops
->set_ctrl
) {
701 ret
= ici
->ops
->set_ctrl(icd
, ctrl
);
702 if (ret
!= -ENOIOCTLCMD
)
706 return v4l2_subdev_call(sd
, core
, s_ctrl
, ctrl
);
709 static int soc_camera_cropcap(struct file
*file
, void *fh
,
710 struct v4l2_cropcap
*a
)
712 struct soc_camera_device
*icd
= file
->private_data
;
713 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
715 return ici
->ops
->cropcap(icd
, a
);
718 static int soc_camera_g_crop(struct file
*file
, void *fh
,
721 struct soc_camera_device
*icd
= file
->private_data
;
722 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
725 ret
= ici
->ops
->get_crop(icd
, a
);
731 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
732 * argument with the actual geometry, instead, the user shall use G_CROP to
735 static int soc_camera_s_crop(struct file
*file
, void *fh
,
738 struct soc_camera_device
*icd
= file
->private_data
;
739 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
740 struct v4l2_rect
*rect
= &a
->c
;
741 struct v4l2_crop current_crop
;
744 if (a
->type
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
747 dev_dbg(&icd
->dev
, "S_CROP(%ux%u@%u:%u)\n",
748 rect
->width
, rect
->height
, rect
->left
, rect
->top
);
750 /* If get_crop fails, we'll let host and / or client drivers decide */
751 ret
= ici
->ops
->get_crop(icd
, ¤t_crop
);
753 /* Prohibit window size change with initialised buffers */
756 "S_CROP denied: getting current crop failed\n");
757 } else if (icd
->vb_vidq
.bufs
[0] &&
758 (a
->c
.width
!= current_crop
.c
.width
||
759 a
->c
.height
!= current_crop
.c
.height
)) {
761 "S_CROP denied: queue initialised and sizes differ\n");
764 ret
= ici
->ops
->set_crop(icd
, a
);
770 static int soc_camera_g_parm(struct file
*file
, void *fh
,
771 struct v4l2_streamparm
*a
)
773 struct soc_camera_device
*icd
= file
->private_data
;
774 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
776 if (ici
->ops
->get_parm
)
777 return ici
->ops
->get_parm(icd
, a
);
782 static int soc_camera_s_parm(struct file
*file
, void *fh
,
783 struct v4l2_streamparm
*a
)
785 struct soc_camera_device
*icd
= file
->private_data
;
786 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
788 if (ici
->ops
->set_parm
)
789 return ici
->ops
->set_parm(icd
, a
);
794 static int soc_camera_g_chip_ident(struct file
*file
, void *fh
,
795 struct v4l2_dbg_chip_ident
*id
)
797 struct soc_camera_device
*icd
= file
->private_data
;
798 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
800 return v4l2_subdev_call(sd
, core
, g_chip_ident
, id
);
803 #ifdef CONFIG_VIDEO_ADV_DEBUG
804 static int soc_camera_g_register(struct file
*file
, void *fh
,
805 struct v4l2_dbg_register
*reg
)
807 struct soc_camera_device
*icd
= file
->private_data
;
808 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
810 return v4l2_subdev_call(sd
, core
, g_register
, reg
);
813 static int soc_camera_s_register(struct file
*file
, void *fh
,
814 struct v4l2_dbg_register
*reg
)
816 struct soc_camera_device
*icd
= file
->private_data
;
817 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
819 return v4l2_subdev_call(sd
, core
, s_register
, reg
);
823 /* So far this function cannot fail */
824 static void scan_add_host(struct soc_camera_host
*ici
)
826 struct soc_camera_device
*icd
;
828 mutex_lock(&list_lock
);
830 list_for_each_entry(icd
, &devices
, list
) {
831 if (icd
->iface
== ici
->nr
) {
833 icd
->dev
.parent
= ici
->v4l2_dev
.dev
;
834 dev_set_name(&icd
->dev
, "%u-%u", icd
->iface
,
836 ret
= device_register(&icd
->dev
);
838 icd
->dev
.parent
= NULL
;
840 "Cannot register device: %d\n", ret
);
845 mutex_unlock(&list_lock
);
848 #ifdef CONFIG_I2C_BOARDINFO
849 static int soc_camera_init_i2c(struct soc_camera_device
*icd
,
850 struct soc_camera_link
*icl
)
852 struct i2c_client
*client
;
853 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
854 struct i2c_adapter
*adap
= i2c_get_adapter(icl
->i2c_adapter_id
);
855 struct v4l2_subdev
*subdev
;
858 dev_err(&icd
->dev
, "Cannot get I2C adapter #%d. No driver?\n",
859 icl
->i2c_adapter_id
);
863 icl
->board_info
->platform_data
= icd
;
865 subdev
= v4l2_i2c_new_subdev_board(&ici
->v4l2_dev
, adap
,
866 icl
->board_info
, NULL
);
870 client
= v4l2_get_subdevdata(subdev
);
872 /* Use to_i2c_client(dev) to recover the i2c client */
873 dev_set_drvdata(&icd
->dev
, &client
->dev
);
877 i2c_put_adapter(adap
);
882 static void soc_camera_free_i2c(struct soc_camera_device
*icd
)
884 struct i2c_client
*client
=
885 to_i2c_client(to_soc_camera_control(icd
));
886 dev_set_drvdata(&icd
->dev
, NULL
);
887 v4l2_device_unregister_subdev(i2c_get_clientdata(client
));
888 i2c_unregister_device(client
);
889 i2c_put_adapter(client
->adapter
);
892 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
893 #define soc_camera_free_i2c(icd) do {} while (0)
896 static int soc_camera_video_start(struct soc_camera_device
*icd
);
897 static int video_dev_create(struct soc_camera_device
*icd
);
898 /* Called during host-driver probe */
899 static int soc_camera_probe(struct device
*dev
)
901 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
902 struct soc_camera_host
*ici
= to_soc_camera_host(dev
->parent
);
903 struct soc_camera_link
*icl
= to_soc_camera_link(icd
);
904 struct device
*control
= NULL
;
905 struct v4l2_subdev
*sd
;
906 struct v4l2_mbus_framefmt mf
;
909 dev_info(dev
, "Probing %s\n", dev_name(dev
));
912 ret
= icl
->power(icd
->pdev
, 1);
915 "Platform failed to power-on the camera.\n");
920 /* The camera could have been already on, try to reset */
922 icl
->reset(icd
->pdev
);
924 ret
= ici
->ops
->add(icd
);
928 /* Must have icd->vdev before registering the device */
929 ret
= video_dev_create(icd
);
933 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
934 if (icl
->board_info
) {
935 ret
= soc_camera_init_i2c(icd
, icl
);
938 } else if (!icl
->add_device
|| !icl
->del_device
) {
942 if (icl
->module_name
)
943 ret
= request_module(icl
->module_name
);
945 ret
= icl
->add_device(icl
, &icd
->dev
);
950 * FIXME: this is racy, have to use driver-binding notification,
951 * when it is available
953 control
= to_soc_camera_control(icd
);
954 if (!control
|| !control
->driver
|| !dev_get_drvdata(control
) ||
955 !try_module_get(control
->driver
->owner
)) {
956 icl
->del_device(icl
);
961 /* At this point client .probe() should have run already */
962 ret
= soc_camera_init_user_formats(icd
);
966 icd
->field
= V4L2_FIELD_ANY
;
968 icd
->vdev
->lock
= &icd
->video_lock
;
971 * ..._video_start() will create a device node, video_register_device()
972 * itself is protected against concurrent open() calls, but we also have
973 * to protect our data.
975 mutex_lock(&icd
->video_lock
);
977 ret
= soc_camera_video_start(icd
);
981 /* Try to improve our guess of a reasonable window format */
982 sd
= soc_camera_to_subdev(icd
);
983 if (!v4l2_subdev_call(sd
, video
, g_mbus_fmt
, &mf
)) {
984 icd
->user_width
= mf
.width
;
985 icd
->user_height
= mf
.height
;
986 icd
->colorspace
= mf
.colorspace
;
987 icd
->field
= mf
.field
;
990 /* Do we have to sysfs_remove_link() before device_unregister()? */
991 if (sysfs_create_link(&icd
->dev
.kobj
, &to_soc_camera_control(icd
)->kobj
,
993 dev_warn(&icd
->dev
, "Failed creating the control symlink\n");
995 ici
->ops
->remove(icd
);
998 icl
->power(icd
->pdev
, 0);
1000 mutex_unlock(&icd
->video_lock
);
1005 mutex_unlock(&icd
->video_lock
);
1006 soc_camera_free_user_formats(icd
);
1008 if (icl
->board_info
) {
1009 soc_camera_free_i2c(icd
);
1011 icl
->del_device(icl
);
1012 module_put(control
->driver
->owner
);
1016 video_device_release(icd
->vdev
);
1018 ici
->ops
->remove(icd
);
1021 icl
->power(icd
->pdev
, 0);
1027 * This is called on device_unregister, which only means we have to disconnect
1028 * from the host, but not remove ourselves from the device list
1030 static int soc_camera_remove(struct device
*dev
)
1032 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
1033 struct soc_camera_link
*icl
= to_soc_camera_link(icd
);
1034 struct video_device
*vdev
= icd
->vdev
;
1036 BUG_ON(!dev
->parent
);
1039 video_unregister_device(vdev
);
1043 if (icl
->board_info
) {
1044 soc_camera_free_i2c(icd
);
1046 struct device_driver
*drv
= to_soc_camera_control(icd
) ?
1047 to_soc_camera_control(icd
)->driver
: NULL
;
1049 icl
->del_device(icl
);
1050 module_put(drv
->owner
);
1053 soc_camera_free_user_formats(icd
);
1058 static int soc_camera_suspend(struct device
*dev
, pm_message_t state
)
1060 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
1061 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
1064 if (ici
->ops
->suspend
)
1065 ret
= ici
->ops
->suspend(icd
, state
);
1070 static int soc_camera_resume(struct device
*dev
)
1072 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
1073 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
1076 if (ici
->ops
->resume
)
1077 ret
= ici
->ops
->resume(icd
);
1082 struct bus_type soc_camera_bus_type
= {
1083 .name
= "soc-camera",
1084 .probe
= soc_camera_probe
,
1085 .remove
= soc_camera_remove
,
1086 .suspend
= soc_camera_suspend
,
1087 .resume
= soc_camera_resume
,
1089 EXPORT_SYMBOL_GPL(soc_camera_bus_type
);
1091 static struct device_driver ic_drv
= {
1093 .bus
= &soc_camera_bus_type
,
1094 .owner
= THIS_MODULE
,
1097 static void dummy_release(struct device
*dev
)
1101 static int default_cropcap(struct soc_camera_device
*icd
,
1102 struct v4l2_cropcap
*a
)
1104 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1105 return v4l2_subdev_call(sd
, video
, cropcap
, a
);
1108 static int default_g_crop(struct soc_camera_device
*icd
, struct v4l2_crop
*a
)
1110 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1111 return v4l2_subdev_call(sd
, video
, g_crop
, a
);
1114 static int default_s_crop(struct soc_camera_device
*icd
, struct v4l2_crop
*a
)
1116 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1117 return v4l2_subdev_call(sd
, video
, s_crop
, a
);
1120 static int default_g_parm(struct soc_camera_device
*icd
,
1121 struct v4l2_streamparm
*parm
)
1123 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1124 return v4l2_subdev_call(sd
, video
, g_parm
, parm
);
1127 static int default_s_parm(struct soc_camera_device
*icd
,
1128 struct v4l2_streamparm
*parm
)
1130 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1131 return v4l2_subdev_call(sd
, video
, s_parm
, parm
);
1134 static void soc_camera_device_init(struct device
*dev
, void *pdata
)
1136 dev
->platform_data
= pdata
;
1137 dev
->bus
= &soc_camera_bus_type
;
1138 dev
->release
= dummy_release
;
1141 int soc_camera_host_register(struct soc_camera_host
*ici
)
1143 struct soc_camera_host
*ix
;
1146 if (!ici
|| !ici
->ops
||
1147 !ici
->ops
->try_fmt
||
1148 !ici
->ops
->set_fmt
||
1149 !ici
->ops
->set_bus_param
||
1150 !ici
->ops
->querycap
||
1151 !ici
->ops
->init_videobuf
||
1152 !ici
->ops
->reqbufs
||
1154 !ici
->ops
->remove
||
1159 if (!ici
->ops
->set_crop
)
1160 ici
->ops
->set_crop
= default_s_crop
;
1161 if (!ici
->ops
->get_crop
)
1162 ici
->ops
->get_crop
= default_g_crop
;
1163 if (!ici
->ops
->cropcap
)
1164 ici
->ops
->cropcap
= default_cropcap
;
1165 if (!ici
->ops
->set_parm
)
1166 ici
->ops
->set_parm
= default_s_parm
;
1167 if (!ici
->ops
->get_parm
)
1168 ici
->ops
->get_parm
= default_g_parm
;
1170 mutex_lock(&list_lock
);
1171 list_for_each_entry(ix
, &hosts
, list
) {
1172 if (ix
->nr
== ici
->nr
) {
1178 ret
= v4l2_device_register(ici
->v4l2_dev
.dev
, &ici
->v4l2_dev
);
1182 list_add_tail(&ici
->list
, &hosts
);
1183 mutex_unlock(&list_lock
);
1190 mutex_unlock(&list_lock
);
1193 EXPORT_SYMBOL(soc_camera_host_register
);
1195 /* Unregister all clients! */
1196 void soc_camera_host_unregister(struct soc_camera_host
*ici
)
1198 struct soc_camera_device
*icd
;
1200 mutex_lock(&list_lock
);
1202 list_del(&ici
->list
);
1204 list_for_each_entry(icd
, &devices
, list
) {
1205 if (icd
->iface
== ici
->nr
) {
1206 void *pdata
= icd
->dev
.platform_data
;
1207 /* The bus->remove will be called */
1208 device_unregister(&icd
->dev
);
1210 * Not before device_unregister(), .remove
1211 * needs parent to call ici->ops->remove().
1212 * If the host module is loaded again, device_register()
1213 * would complain "already initialised," since 2.6.32
1214 * this is also needed to prevent use-after-free of the
1215 * device private data.
1217 memset(&icd
->dev
, 0, sizeof(icd
->dev
));
1218 soc_camera_device_init(&icd
->dev
, pdata
);
1222 mutex_unlock(&list_lock
);
1224 v4l2_device_unregister(&ici
->v4l2_dev
);
1226 EXPORT_SYMBOL(soc_camera_host_unregister
);
1228 /* Image capture device */
1229 static int soc_camera_device_register(struct soc_camera_device
*icd
)
1231 struct soc_camera_device
*ix
;
1234 for (i
= 0; i
< 256 && num
< 0; i
++) {
1236 /* Check if this index is available on this interface */
1237 list_for_each_entry(ix
, &devices
, list
) {
1238 if (ix
->iface
== icd
->iface
&& ix
->devnum
== i
) {
1247 * ok, we have 256 cameras on this host...
1248 * man, stay reasonable...
1254 icd
->host_priv
= NULL
;
1255 mutex_init(&icd
->video_lock
);
1257 list_add_tail(&icd
->list
, &devices
);
1262 static void soc_camera_device_unregister(struct soc_camera_device
*icd
)
1264 list_del(&icd
->list
);
1267 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops
= {
1268 .vidioc_querycap
= soc_camera_querycap
,
1269 .vidioc_g_fmt_vid_cap
= soc_camera_g_fmt_vid_cap
,
1270 .vidioc_enum_fmt_vid_cap
= soc_camera_enum_fmt_vid_cap
,
1271 .vidioc_s_fmt_vid_cap
= soc_camera_s_fmt_vid_cap
,
1272 .vidioc_enum_input
= soc_camera_enum_input
,
1273 .vidioc_g_input
= soc_camera_g_input
,
1274 .vidioc_s_input
= soc_camera_s_input
,
1275 .vidioc_s_std
= soc_camera_s_std
,
1276 .vidioc_reqbufs
= soc_camera_reqbufs
,
1277 .vidioc_try_fmt_vid_cap
= soc_camera_try_fmt_vid_cap
,
1278 .vidioc_querybuf
= soc_camera_querybuf
,
1279 .vidioc_qbuf
= soc_camera_qbuf
,
1280 .vidioc_dqbuf
= soc_camera_dqbuf
,
1281 .vidioc_streamon
= soc_camera_streamon
,
1282 .vidioc_streamoff
= soc_camera_streamoff
,
1283 .vidioc_queryctrl
= soc_camera_queryctrl
,
1284 .vidioc_g_ctrl
= soc_camera_g_ctrl
,
1285 .vidioc_s_ctrl
= soc_camera_s_ctrl
,
1286 .vidioc_cropcap
= soc_camera_cropcap
,
1287 .vidioc_g_crop
= soc_camera_g_crop
,
1288 .vidioc_s_crop
= soc_camera_s_crop
,
1289 .vidioc_g_parm
= soc_camera_g_parm
,
1290 .vidioc_s_parm
= soc_camera_s_parm
,
1291 .vidioc_g_chip_ident
= soc_camera_g_chip_ident
,
1292 #ifdef CONFIG_VIDEO_ADV_DEBUG
1293 .vidioc_g_register
= soc_camera_g_register
,
1294 .vidioc_s_register
= soc_camera_s_register
,
1298 static int video_dev_create(struct soc_camera_device
*icd
)
1300 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
1301 struct video_device
*vdev
= video_device_alloc();
1306 strlcpy(vdev
->name
, ici
->drv_name
, sizeof(vdev
->name
));
1308 vdev
->parent
= &icd
->dev
;
1309 vdev
->current_norm
= V4L2_STD_UNKNOWN
;
1310 vdev
->fops
= &soc_camera_fops
;
1311 vdev
->ioctl_ops
= &soc_camera_ioctl_ops
;
1312 vdev
->release
= video_device_release
;
1313 vdev
->tvnorms
= V4L2_STD_UNKNOWN
;
1321 * Called from soc_camera_probe() above (with .video_lock held???)
1323 static int soc_camera_video_start(struct soc_camera_device
*icd
)
1325 struct device_type
*type
= icd
->vdev
->dev
.type
;
1328 if (!icd
->dev
.parent
)
1332 !icd
->ops
->query_bus_param
||
1333 !icd
->ops
->set_bus_param
)
1336 ret
= video_register_device(icd
->vdev
, VFL_TYPE_GRABBER
, -1);
1338 dev_err(&icd
->dev
, "video_register_device failed: %d\n", ret
);
1342 /* Restore device type, possibly set by the subdevice driver */
1343 icd
->vdev
->dev
.type
= type
;
1348 static int __devinit
soc_camera_pdrv_probe(struct platform_device
*pdev
)
1350 struct soc_camera_link
*icl
= pdev
->dev
.platform_data
;
1351 struct soc_camera_device
*icd
;
1357 icd
= kzalloc(sizeof(*icd
), GFP_KERNEL
);
1361 icd
->iface
= icl
->bus_id
;
1362 icd
->pdev
= &pdev
->dev
;
1363 platform_set_drvdata(pdev
, icd
);
1365 ret
= soc_camera_device_register(icd
);
1369 soc_camera_device_init(&icd
->dev
, icl
);
1371 icd
->user_width
= DEFAULT_WIDTH
;
1372 icd
->user_height
= DEFAULT_HEIGHT
;
1383 * Only called on rmmod for each platform device, since they are not
1384 * hot-pluggable. Now we know, that all our users - hosts and devices have
1385 * been unloaded already
1387 static int __devexit
soc_camera_pdrv_remove(struct platform_device
*pdev
)
1389 struct soc_camera_device
*icd
= platform_get_drvdata(pdev
);
1394 soc_camera_device_unregister(icd
);
1401 static struct platform_driver __refdata soc_camera_pdrv
= {
1402 .remove
= __devexit_p(soc_camera_pdrv_remove
),
1404 .name
= "soc-camera-pdrv",
1405 .owner
= THIS_MODULE
,
1409 static int __init
soc_camera_init(void)
1411 int ret
= bus_register(&soc_camera_bus_type
);
1414 ret
= driver_register(&ic_drv
);
1418 ret
= platform_driver_probe(&soc_camera_pdrv
, soc_camera_pdrv_probe
);
1425 driver_unregister(&ic_drv
);
1427 bus_unregister(&soc_camera_bus_type
);
1431 static void __exit
soc_camera_exit(void)
1433 platform_driver_unregister(&soc_camera_pdrv
);
1434 driver_unregister(&ic_drv
);
1435 bus_unregister(&soc_camera_bus_type
);
1438 module_init(soc_camera_init
);
1439 module_exit(soc_camera_exit
);
1441 MODULE_DESCRIPTION("Image capture bus driver");
1442 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1443 MODULE_LICENSE("GPL");
1444 MODULE_ALIAS("platform:soc-camera-pdrv");