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/module.h>
25 #include <linux/mutex.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-dev.h>
32 #include <media/v4l2-ioctl.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
);
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
;
157 if (icd
->ops
->set_std
)
158 ret
= icd
->ops
->set_std(icd
, a
);
163 static int soc_camera_reqbufs(struct file
*file
, void *priv
,
164 struct v4l2_requestbuffers
*p
)
167 struct soc_camera_file
*icf
= file
->private_data
;
168 struct soc_camera_device
*icd
= icf
->icd
;
169 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
171 WARN_ON(priv
!= file
->private_data
);
173 dev_dbg(&icd
->dev
, "%s: %d\n", __func__
, p
->memory
);
175 ret
= videobuf_reqbufs(&icf
->vb_vidq
, p
);
179 return ici
->ops
->reqbufs(icf
, p
);
182 static int soc_camera_querybuf(struct file
*file
, void *priv
,
183 struct v4l2_buffer
*p
)
185 struct soc_camera_file
*icf
= file
->private_data
;
187 WARN_ON(priv
!= file
->private_data
);
189 return videobuf_querybuf(&icf
->vb_vidq
, p
);
192 static int soc_camera_qbuf(struct file
*file
, void *priv
,
193 struct v4l2_buffer
*p
)
195 struct soc_camera_file
*icf
= file
->private_data
;
197 WARN_ON(priv
!= file
->private_data
);
199 return videobuf_qbuf(&icf
->vb_vidq
, p
);
202 static int soc_camera_dqbuf(struct file
*file
, void *priv
,
203 struct v4l2_buffer
*p
)
205 struct soc_camera_file
*icf
= file
->private_data
;
207 WARN_ON(priv
!= file
->private_data
);
209 return videobuf_dqbuf(&icf
->vb_vidq
, p
, file
->f_flags
& O_NONBLOCK
);
212 static int soc_camera_init_user_formats(struct soc_camera_device
*icd
)
214 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
217 if (!ici
->ops
->get_formats
)
219 * Fallback mode - the host will have to serve all
220 * sensor-provided formats one-to-one to the user
222 fmts
= icd
->num_formats
;
225 * First pass - only count formats this host-sensor
226 * configuration can provide
228 for (i
= 0; i
< icd
->num_formats
; i
++)
229 fmts
+= 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
;
242 dev_dbg(&icd
->dev
, "Found %d supported formats.\n", fmts
);
244 /* 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 fmts
+= ici
->ops
->get_formats(icd
, i
,
252 &icd
->user_formats
[fmts
]);
255 icd
->current_fmt
= icd
->user_formats
[0].host_fmt
;
260 static void soc_camera_free_user_formats(struct soc_camera_device
*icd
)
262 vfree(icd
->user_formats
);
265 /* Called with .vb_lock held */
266 static int soc_camera_set_fmt(struct soc_camera_file
*icf
,
267 struct v4l2_format
*f
)
269 struct soc_camera_device
*icd
= icf
->icd
;
270 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
271 struct v4l2_pix_format
*pix
= &f
->fmt
.pix
;
274 /* We always call try_fmt() before set_fmt() or set_crop() */
275 ret
= ici
->ops
->try_fmt(icd
, f
);
279 ret
= ici
->ops
->set_fmt(icd
, f
);
282 } else if (!icd
->current_fmt
||
283 icd
->current_fmt
->fourcc
!= pix
->pixelformat
) {
285 "Host driver hasn't set up current format correctly!\n");
289 icd
->width
= pix
->width
;
290 icd
->height
= pix
->height
;
292 icd
->field
= pix
->field
;
294 if (f
->type
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
295 dev_warn(&icd
->dev
, "Attention! Wrong buf-type %d\n",
298 dev_dbg(&icd
->dev
, "set width: %d height: %d\n",
299 icd
->width
, icd
->height
);
301 /* set physical bus parameters */
302 return ici
->ops
->set_bus_param(icd
, pix
->pixelformat
);
305 static int soc_camera_open(struct file
*file
)
307 struct video_device
*vdev
;
308 struct soc_camera_device
*icd
;
309 struct soc_camera_host
*ici
;
310 struct soc_camera_file
*icf
;
313 icf
= vmalloc(sizeof(*icf
));
318 * It is safe to dereference these pointers now as long as a user has
319 * the video device open - we are protected by the held cdev reference.
322 vdev
= video_devdata(file
);
323 icd
= container_of(vdev
->parent
, struct soc_camera_device
, dev
);
324 ici
= to_soc_camera_host(icd
->dev
.parent
);
326 if (!try_module_get(icd
->ops
->owner
)) {
327 dev_err(&icd
->dev
, "Couldn't lock sensor driver.\n");
332 if (!try_module_get(ici
->ops
->owner
)) {
333 dev_err(&icd
->dev
, "Couldn't lock capture bus driver.\n");
338 /* Protect against icd->remove() until we module_get() both drivers. */
339 mutex_lock(&icd
->video_lock
);
344 /* Now we really have to activate the camera */
345 if (icd
->use_count
== 1) {
346 /* Restore parameters before the last close() per V4L2 API */
347 struct v4l2_format f
= {
348 .type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
,
351 .height
= icd
->height
,
353 .pixelformat
= icd
->current_fmt
->fourcc
,
354 .colorspace
= icd
->current_fmt
->colorspace
,
358 ret
= ici
->ops
->add(icd
);
360 dev_err(&icd
->dev
, "Couldn't activate the camera: %d\n", ret
);
364 /* Try to configure with default parameters */
365 ret
= soc_camera_set_fmt(icf
, &f
);
370 mutex_unlock(&icd
->video_lock
);
372 file
->private_data
= icf
;
373 dev_dbg(&icd
->dev
, "camera device open\n");
375 ici
->ops
->init_videobuf(&icf
->vb_vidq
, icd
);
380 * First three errors are entered with the .video_lock held
384 ici
->ops
->remove(icd
);
387 mutex_unlock(&icd
->video_lock
);
388 module_put(ici
->ops
->owner
);
390 module_put(icd
->ops
->owner
);
396 static int soc_camera_close(struct file
*file
)
398 struct soc_camera_file
*icf
= file
->private_data
;
399 struct soc_camera_device
*icd
= icf
->icd
;
400 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
401 struct video_device
*vdev
= icd
->vdev
;
403 mutex_lock(&icd
->video_lock
);
406 ici
->ops
->remove(icd
);
408 mutex_unlock(&icd
->video_lock
);
410 module_put(icd
->ops
->owner
);
411 module_put(ici
->ops
->owner
);
415 dev_dbg(vdev
->parent
, "camera device close\n");
420 static ssize_t
soc_camera_read(struct file
*file
, char __user
*buf
,
421 size_t count
, loff_t
*ppos
)
423 struct soc_camera_file
*icf
= file
->private_data
;
424 struct soc_camera_device
*icd
= icf
->icd
;
425 struct video_device
*vdev
= icd
->vdev
;
428 dev_err(vdev
->parent
, "camera device read not implemented\n");
433 static int soc_camera_mmap(struct file
*file
, struct vm_area_struct
*vma
)
435 struct soc_camera_file
*icf
= file
->private_data
;
436 struct soc_camera_device
*icd
= icf
->icd
;
439 dev_dbg(&icd
->dev
, "mmap called, vma=0x%08lx\n", (unsigned long)vma
);
441 err
= videobuf_mmap_mapper(&icf
->vb_vidq
, vma
);
443 dev_dbg(&icd
->dev
, "vma start=0x%08lx, size=%ld, ret=%d\n",
444 (unsigned long)vma
->vm_start
,
445 (unsigned long)vma
->vm_end
- (unsigned long)vma
->vm_start
,
451 static unsigned int soc_camera_poll(struct file
*file
, poll_table
*pt
)
453 struct soc_camera_file
*icf
= file
->private_data
;
454 struct soc_camera_device
*icd
= icf
->icd
;
455 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
457 if (list_empty(&icf
->vb_vidq
.stream
)) {
458 dev_err(&icd
->dev
, "Trying to poll with no queued buffers!\n");
462 return ici
->ops
->poll(file
, pt
);
465 static struct v4l2_file_operations soc_camera_fops
= {
466 .owner
= THIS_MODULE
,
467 .open
= soc_camera_open
,
468 .release
= soc_camera_close
,
469 .ioctl
= video_ioctl2
,
470 .read
= soc_camera_read
,
471 .mmap
= soc_camera_mmap
,
472 .poll
= soc_camera_poll
,
475 static int soc_camera_s_fmt_vid_cap(struct file
*file
, void *priv
,
476 struct v4l2_format
*f
)
478 struct soc_camera_file
*icf
= file
->private_data
;
479 struct soc_camera_device
*icd
= icf
->icd
;
482 WARN_ON(priv
!= file
->private_data
);
484 mutex_lock(&icf
->vb_vidq
.vb_lock
);
486 if (videobuf_queue_is_busy(&icf
->vb_vidq
)) {
487 dev_err(&icd
->dev
, "S_FMT denied: queue busy\n");
492 ret
= soc_camera_set_fmt(icf
, f
);
495 mutex_unlock(&icf
->vb_vidq
.vb_lock
);
500 static int soc_camera_enum_fmt_vid_cap(struct file
*file
, void *priv
,
501 struct v4l2_fmtdesc
*f
)
503 struct soc_camera_file
*icf
= file
->private_data
;
504 struct soc_camera_device
*icd
= icf
->icd
;
505 const struct soc_camera_data_format
*format
;
507 WARN_ON(priv
!= file
->private_data
);
509 if (f
->index
>= icd
->num_user_formats
)
512 format
= icd
->user_formats
[f
->index
].host_fmt
;
514 strlcpy(f
->description
, format
->name
, sizeof(f
->description
));
515 f
->pixelformat
= format
->fourcc
;
519 static int soc_camera_g_fmt_vid_cap(struct file
*file
, void *priv
,
520 struct v4l2_format
*f
)
522 struct soc_camera_file
*icf
= file
->private_data
;
523 struct soc_camera_device
*icd
= icf
->icd
;
524 struct v4l2_pix_format
*pix
= &f
->fmt
.pix
;
526 WARN_ON(priv
!= file
->private_data
);
528 pix
->width
= icd
->width
;
529 pix
->height
= icd
->height
;
530 pix
->field
= icf
->vb_vidq
.field
;
531 pix
->pixelformat
= icd
->current_fmt
->fourcc
;
532 pix
->bytesperline
= pix
->width
*
533 DIV_ROUND_UP(icd
->current_fmt
->depth
, 8);
534 pix
->sizeimage
= pix
->height
* pix
->bytesperline
;
535 dev_dbg(&icd
->dev
, "current_fmt->fourcc: 0x%08x\n",
536 icd
->current_fmt
->fourcc
);
540 static int soc_camera_querycap(struct file
*file
, void *priv
,
541 struct v4l2_capability
*cap
)
543 struct soc_camera_file
*icf
= file
->private_data
;
544 struct soc_camera_device
*icd
= icf
->icd
;
545 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
547 WARN_ON(priv
!= file
->private_data
);
549 strlcpy(cap
->driver
, ici
->drv_name
, sizeof(cap
->driver
));
550 return ici
->ops
->querycap(ici
, cap
);
553 static int soc_camera_streamon(struct file
*file
, void *priv
,
554 enum v4l2_buf_type i
)
556 struct soc_camera_file
*icf
= file
->private_data
;
557 struct soc_camera_device
*icd
= icf
->icd
;
560 WARN_ON(priv
!= file
->private_data
);
562 dev_dbg(&icd
->dev
, "%s\n", __func__
);
564 if (i
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
567 mutex_lock(&icd
->video_lock
);
569 icd
->ops
->start_capture(icd
);
571 /* This calls buf_queue from host driver's videobuf_queue_ops */
572 ret
= videobuf_streamon(&icf
->vb_vidq
);
574 mutex_unlock(&icd
->video_lock
);
579 static int soc_camera_streamoff(struct file
*file
, void *priv
,
580 enum v4l2_buf_type i
)
582 struct soc_camera_file
*icf
= file
->private_data
;
583 struct soc_camera_device
*icd
= icf
->icd
;
585 WARN_ON(priv
!= file
->private_data
);
587 dev_dbg(&icd
->dev
, "%s\n", __func__
);
589 if (i
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
592 mutex_lock(&icd
->video_lock
);
594 /* This calls buf_release from host driver's videobuf_queue_ops for all
595 * remaining buffers. When the last buffer is freed, stop capture */
596 videobuf_streamoff(&icf
->vb_vidq
);
598 icd
->ops
->stop_capture(icd
);
600 mutex_unlock(&icd
->video_lock
);
605 static int soc_camera_queryctrl(struct file
*file
, void *priv
,
606 struct v4l2_queryctrl
*qc
)
608 struct soc_camera_file
*icf
= file
->private_data
;
609 struct soc_camera_device
*icd
= icf
->icd
;
612 WARN_ON(priv
!= file
->private_data
);
617 for (i
= 0; i
< icd
->ops
->num_controls
; i
++)
618 if (qc
->id
== icd
->ops
->controls
[i
].id
) {
619 memcpy(qc
, &(icd
->ops
->controls
[i
]),
627 static int soc_camera_g_ctrl(struct file
*file
, void *priv
,
628 struct v4l2_control
*ctrl
)
630 struct soc_camera_file
*icf
= file
->private_data
;
631 struct soc_camera_device
*icd
= icf
->icd
;
633 WARN_ON(priv
!= file
->private_data
);
637 if (icd
->gain
== (unsigned short)~0)
639 ctrl
->value
= icd
->gain
;
641 case V4L2_CID_EXPOSURE
:
642 if (icd
->exposure
== (unsigned short)~0)
644 ctrl
->value
= icd
->exposure
;
648 if (icd
->ops
->get_control
)
649 return icd
->ops
->get_control(icd
, ctrl
);
653 static int soc_camera_s_ctrl(struct file
*file
, void *priv
,
654 struct v4l2_control
*ctrl
)
656 struct soc_camera_file
*icf
= file
->private_data
;
657 struct soc_camera_device
*icd
= icf
->icd
;
659 WARN_ON(priv
!= file
->private_data
);
661 if (icd
->ops
->set_control
)
662 return icd
->ops
->set_control(icd
, ctrl
);
666 static int soc_camera_cropcap(struct file
*file
, void *fh
,
667 struct v4l2_cropcap
*a
)
669 struct soc_camera_file
*icf
= file
->private_data
;
670 struct soc_camera_device
*icd
= icf
->icd
;
672 a
->type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
673 a
->bounds
.left
= icd
->x_min
;
674 a
->bounds
.top
= icd
->y_min
;
675 a
->bounds
.width
= icd
->width_max
;
676 a
->bounds
.height
= icd
->height_max
;
677 a
->defrect
.left
= icd
->x_min
;
678 a
->defrect
.top
= icd
->y_min
;
679 a
->defrect
.width
= DEFAULT_WIDTH
;
680 a
->defrect
.height
= DEFAULT_HEIGHT
;
681 a
->pixelaspect
.numerator
= 1;
682 a
->pixelaspect
.denominator
= 1;
687 static int soc_camera_g_crop(struct file
*file
, void *fh
,
690 struct soc_camera_file
*icf
= file
->private_data
;
691 struct soc_camera_device
*icd
= icf
->icd
;
693 a
->type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
694 a
->c
.left
= icd
->x_current
;
695 a
->c
.top
= icd
->y_current
;
696 a
->c
.width
= icd
->width
;
697 a
->c
.height
= icd
->height
;
702 static int soc_camera_s_crop(struct file
*file
, void *fh
,
705 struct soc_camera_file
*icf
= file
->private_data
;
706 struct soc_camera_device
*icd
= icf
->icd
;
707 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
710 if (a
->type
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
713 /* Cropping is allowed during a running capture, guard consistency */
714 mutex_lock(&icf
->vb_vidq
.vb_lock
);
716 ret
= ici
->ops
->set_crop(icd
, &a
->c
);
718 icd
->width
= a
->c
.width
;
719 icd
->height
= a
->c
.height
;
720 icd
->x_current
= a
->c
.left
;
721 icd
->y_current
= a
->c
.top
;
724 mutex_unlock(&icf
->vb_vidq
.vb_lock
);
729 static int soc_camera_g_chip_ident(struct file
*file
, void *fh
,
730 struct v4l2_dbg_chip_ident
*id
)
732 struct soc_camera_file
*icf
= file
->private_data
;
733 struct soc_camera_device
*icd
= icf
->icd
;
735 if (!icd
->ops
->get_chip_id
)
738 return icd
->ops
->get_chip_id(icd
, id
);
741 #ifdef CONFIG_VIDEO_ADV_DEBUG
742 static int soc_camera_g_register(struct file
*file
, void *fh
,
743 struct v4l2_dbg_register
*reg
)
745 struct soc_camera_file
*icf
= file
->private_data
;
746 struct soc_camera_device
*icd
= icf
->icd
;
748 if (!icd
->ops
->get_register
)
751 return icd
->ops
->get_register(icd
, reg
);
754 static int soc_camera_s_register(struct file
*file
, void *fh
,
755 struct v4l2_dbg_register
*reg
)
757 struct soc_camera_file
*icf
= file
->private_data
;
758 struct soc_camera_device
*icd
= icf
->icd
;
760 if (!icd
->ops
->set_register
)
763 return icd
->ops
->set_register(icd
, reg
);
767 static int device_register_link(struct soc_camera_device
*icd
)
769 int ret
= dev_set_name(&icd
->dev
, "%u-%u", icd
->iface
, icd
->devnum
);
772 ret
= device_register(&icd
->dev
);
775 /* Prevent calling device_unregister() */
776 icd
->dev
.parent
= NULL
;
777 dev_err(&icd
->dev
, "Cannot register device: %d\n", ret
);
778 /* Even if probe() was unsuccessful for all registered drivers,
779 * device_register() returns 0, and we add the link, just to
780 * document this camera's control device */
781 } else if (icd
->control
)
782 /* Have to sysfs_remove_link() before device_unregister()? */
783 if (sysfs_create_link(&icd
->dev
.kobj
, &icd
->control
->kobj
,
786 "Failed creating the control symlink\n");
790 /* So far this function cannot fail */
791 static void scan_add_host(struct soc_camera_host
*ici
)
793 struct soc_camera_device
*icd
;
795 mutex_lock(&list_lock
);
797 list_for_each_entry(icd
, &devices
, list
) {
798 if (icd
->iface
== ici
->nr
) {
799 icd
->dev
.parent
= ici
->dev
;
800 device_register_link(icd
);
804 mutex_unlock(&list_lock
);
807 /* return: 0 if no match found or a match found and
808 * device_register() successful, error code otherwise */
809 static int scan_add_device(struct soc_camera_device
*icd
)
811 struct soc_camera_host
*ici
;
814 mutex_lock(&list_lock
);
816 list_add_tail(&icd
->list
, &devices
);
818 /* Watch out for class_for_each_device / class_find_device API by
819 * Dave Young <hidave.darkstar@gmail.com> */
820 list_for_each_entry(ici
, &hosts
, list
) {
821 if (icd
->iface
== ici
->nr
) {
823 icd
->dev
.parent
= ici
->dev
;
828 mutex_unlock(&list_lock
);
831 ret
= device_register_link(icd
);
836 static int soc_camera_probe(struct device
*dev
)
838 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
839 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
843 * Possible race scenario:
844 * modprobe <camera-host-driver> triggers __func__
845 * at this moment respective <camera-sensor-driver> gets rmmod'ed
846 * to protect take module references.
849 if (!try_module_get(icd
->ops
->owner
)) {
850 dev_err(&icd
->dev
, "Couldn't lock sensor driver.\n");
855 if (!try_module_get(ici
->ops
->owner
)) {
856 dev_err(&icd
->dev
, "Couldn't lock capture bus driver.\n");
861 mutex_lock(&icd
->video_lock
);
863 /* We only call ->add() here to activate and probe the camera.
864 * We shall ->remove() and deactivate it immediately afterwards. */
865 ret
= ici
->ops
->add(icd
);
869 ret
= icd
->ops
->probe(icd
);
871 const struct v4l2_queryctrl
*qctrl
;
873 qctrl
= soc_camera_find_qctrl(icd
->ops
, V4L2_CID_GAIN
);
874 icd
->gain
= qctrl
? qctrl
->default_value
: (unsigned short)~0;
875 qctrl
= soc_camera_find_qctrl(icd
->ops
, V4L2_CID_EXPOSURE
);
876 icd
->exposure
= qctrl
? qctrl
->default_value
:
879 ret
= soc_camera_init_user_formats(icd
);
883 icd
->height
= DEFAULT_HEIGHT
;
884 icd
->width
= DEFAULT_WIDTH
;
885 icd
->field
= V4L2_FIELD_ANY
;
889 ici
->ops
->remove(icd
);
891 mutex_unlock(&icd
->video_lock
);
892 module_put(ici
->ops
->owner
);
894 module_put(icd
->ops
->owner
);
899 /* This is called on device_unregister, which only means we have to disconnect
900 * from the host, but not remove ourselves from the device list */
901 static int soc_camera_remove(struct device
*dev
)
903 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
905 if (icd
->ops
->remove
)
906 icd
->ops
->remove(icd
);
908 soc_camera_free_user_formats(icd
);
913 static int soc_camera_suspend(struct device
*dev
, pm_message_t state
)
915 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
916 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
919 if (ici
->ops
->suspend
)
920 ret
= ici
->ops
->suspend(icd
, state
);
925 static int soc_camera_resume(struct device
*dev
)
927 struct soc_camera_device
*icd
= to_soc_camera_dev(dev
);
928 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
931 if (ici
->ops
->resume
)
932 ret
= ici
->ops
->resume(icd
);
937 static struct bus_type soc_camera_bus_type
= {
938 .name
= "soc-camera",
939 .probe
= soc_camera_probe
,
940 .remove
= soc_camera_remove
,
941 .suspend
= soc_camera_suspend
,
942 .resume
= soc_camera_resume
,
945 static struct device_driver ic_drv
= {
947 .bus
= &soc_camera_bus_type
,
948 .owner
= THIS_MODULE
,
951 static void dummy_release(struct device
*dev
)
955 int soc_camera_host_register(struct soc_camera_host
*ici
)
957 struct soc_camera_host
*ix
;
959 if (!ici
|| !ici
->ops
||
960 !ici
->ops
->try_fmt
||
961 !ici
->ops
->set_fmt
||
962 !ici
->ops
->set_crop
||
963 !ici
->ops
->set_bus_param
||
964 !ici
->ops
->querycap
||
965 !ici
->ops
->init_videobuf
||
966 !ici
->ops
->reqbufs
||
973 mutex_lock(&list_lock
);
974 list_for_each_entry(ix
, &hosts
, list
) {
975 if (ix
->nr
== ici
->nr
) {
976 mutex_unlock(&list_lock
);
981 dev_set_drvdata(ici
->dev
, ici
);
983 list_add_tail(&ici
->list
, &hosts
);
984 mutex_unlock(&list_lock
);
990 EXPORT_SYMBOL(soc_camera_host_register
);
992 /* Unregister all clients! */
993 void soc_camera_host_unregister(struct soc_camera_host
*ici
)
995 struct soc_camera_device
*icd
;
997 mutex_lock(&list_lock
);
999 list_del(&ici
->list
);
1001 list_for_each_entry(icd
, &devices
, list
) {
1002 if (icd
->dev
.parent
== ici
->dev
) {
1003 device_unregister(&icd
->dev
);
1004 /* Not before device_unregister(), .remove
1005 * needs parent to call ici->ops->remove() */
1006 icd
->dev
.parent
= NULL
;
1007 memset(&icd
->dev
.kobj
, 0, sizeof(icd
->dev
.kobj
));
1011 mutex_unlock(&list_lock
);
1013 dev_set_drvdata(ici
->dev
, NULL
);
1015 EXPORT_SYMBOL(soc_camera_host_unregister
);
1017 /* Image capture device */
1018 int soc_camera_device_register(struct soc_camera_device
*icd
)
1020 struct soc_camera_device
*ix
;
1023 if (!icd
|| !icd
->ops
||
1026 !icd
->ops
->release
||
1027 !icd
->ops
->start_capture
||
1028 !icd
->ops
->stop_capture
||
1029 !icd
->ops
->set_crop
||
1030 !icd
->ops
->set_fmt
||
1031 !icd
->ops
->try_fmt
||
1032 !icd
->ops
->query_bus_param
||
1033 !icd
->ops
->set_bus_param
)
1036 for (i
= 0; i
< 256 && num
< 0; i
++) {
1038 list_for_each_entry(ix
, &devices
, list
) {
1039 if (ix
->iface
== icd
->iface
&& ix
->devnum
== i
) {
1047 /* ok, we have 256 cameras on this host...
1048 * man, stay reasonable... */
1052 icd
->dev
.bus
= &soc_camera_bus_type
;
1054 icd
->dev
.release
= dummy_release
;
1056 icd
->host_priv
= NULL
;
1057 mutex_init(&icd
->video_lock
);
1059 return scan_add_device(icd
);
1061 EXPORT_SYMBOL(soc_camera_device_register
);
1063 void soc_camera_device_unregister(struct soc_camera_device
*icd
)
1065 mutex_lock(&list_lock
);
1066 list_del(&icd
->list
);
1068 /* The bus->remove will be eventually called */
1069 if (icd
->dev
.parent
)
1070 device_unregister(&icd
->dev
);
1071 mutex_unlock(&list_lock
);
1073 EXPORT_SYMBOL(soc_camera_device_unregister
);
1075 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops
= {
1076 .vidioc_querycap
= soc_camera_querycap
,
1077 .vidioc_g_fmt_vid_cap
= soc_camera_g_fmt_vid_cap
,
1078 .vidioc_enum_fmt_vid_cap
= soc_camera_enum_fmt_vid_cap
,
1079 .vidioc_s_fmt_vid_cap
= soc_camera_s_fmt_vid_cap
,
1080 .vidioc_enum_input
= soc_camera_enum_input
,
1081 .vidioc_g_input
= soc_camera_g_input
,
1082 .vidioc_s_input
= soc_camera_s_input
,
1083 .vidioc_s_std
= soc_camera_s_std
,
1084 .vidioc_reqbufs
= soc_camera_reqbufs
,
1085 .vidioc_try_fmt_vid_cap
= soc_camera_try_fmt_vid_cap
,
1086 .vidioc_querybuf
= soc_camera_querybuf
,
1087 .vidioc_qbuf
= soc_camera_qbuf
,
1088 .vidioc_dqbuf
= soc_camera_dqbuf
,
1089 .vidioc_streamon
= soc_camera_streamon
,
1090 .vidioc_streamoff
= soc_camera_streamoff
,
1091 .vidioc_queryctrl
= soc_camera_queryctrl
,
1092 .vidioc_g_ctrl
= soc_camera_g_ctrl
,
1093 .vidioc_s_ctrl
= soc_camera_s_ctrl
,
1094 .vidioc_cropcap
= soc_camera_cropcap
,
1095 .vidioc_g_crop
= soc_camera_g_crop
,
1096 .vidioc_s_crop
= soc_camera_s_crop
,
1097 .vidioc_g_chip_ident
= soc_camera_g_chip_ident
,
1098 #ifdef CONFIG_VIDEO_ADV_DEBUG
1099 .vidioc_g_register
= soc_camera_g_register
,
1100 .vidioc_s_register
= soc_camera_s_register
,
1105 * Usually called from the struct soc_camera_ops .probe() method, i.e., from
1106 * soc_camera_probe() above with .video_lock held
1108 int soc_camera_video_start(struct soc_camera_device
*icd
)
1110 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->dev
.parent
);
1112 struct video_device
*vdev
;
1114 if (!icd
->dev
.parent
)
1117 vdev
= video_device_alloc();
1120 dev_dbg(ici
->dev
, "Allocated video_device %p\n", vdev
);
1122 strlcpy(vdev
->name
, ici
->drv_name
, sizeof(vdev
->name
));
1124 vdev
->parent
= &icd
->dev
;
1125 vdev
->current_norm
= V4L2_STD_UNKNOWN
;
1126 vdev
->fops
= &soc_camera_fops
;
1127 vdev
->ioctl_ops
= &soc_camera_ioctl_ops
;
1128 vdev
->release
= video_device_release
;
1130 vdev
->tvnorms
= V4L2_STD_UNKNOWN
,
1132 err
= video_register_device(vdev
, VFL_TYPE_GRABBER
, vdev
->minor
);
1134 dev_err(vdev
->parent
, "video_register_device failed\n");
1142 video_device_release(vdev
);
1146 EXPORT_SYMBOL(soc_camera_video_start
);
1148 void soc_camera_video_stop(struct soc_camera_device
*icd
)
1150 struct video_device
*vdev
= icd
->vdev
;
1152 dev_dbg(&icd
->dev
, "%s\n", __func__
);
1154 if (!icd
->dev
.parent
|| !vdev
)
1157 mutex_lock(&icd
->video_lock
);
1158 video_unregister_device(vdev
);
1160 mutex_unlock(&icd
->video_lock
);
1162 EXPORT_SYMBOL(soc_camera_video_stop
);
1164 static int __devinit
soc_camera_pdrv_probe(struct platform_device
*pdev
)
1166 struct soc_camera_link
*icl
= pdev
->dev
.platform_data
;
1167 struct i2c_adapter
*adap
;
1168 struct i2c_client
*client
;
1173 adap
= i2c_get_adapter(icl
->i2c_adapter_id
);
1175 dev_warn(&pdev
->dev
, "Cannot get adapter #%d. No driver?\n",
1176 icl
->i2c_adapter_id
);
1177 /* -ENODEV and -ENXIO do not produce an error on probe()... */
1181 icl
->board_info
->platform_data
= icl
;
1182 client
= i2c_new_device(adap
, icl
->board_info
);
1184 i2c_put_adapter(adap
);
1188 platform_set_drvdata(pdev
, client
);
1193 static int __devexit
soc_camera_pdrv_remove(struct platform_device
*pdev
)
1195 struct i2c_client
*client
= platform_get_drvdata(pdev
);
1200 i2c_unregister_device(client
);
1201 i2c_put_adapter(client
->adapter
);
1206 static struct platform_driver __refdata soc_camera_pdrv
= {
1207 .probe
= soc_camera_pdrv_probe
,
1208 .remove
= __devexit_p(soc_camera_pdrv_remove
),
1210 .name
= "soc-camera-pdrv",
1211 .owner
= THIS_MODULE
,
1215 static int __init
soc_camera_init(void)
1217 int ret
= bus_register(&soc_camera_bus_type
);
1220 ret
= driver_register(&ic_drv
);
1224 ret
= platform_driver_register(&soc_camera_pdrv
);
1231 driver_unregister(&ic_drv
);
1233 bus_unregister(&soc_camera_bus_type
);
1237 static void __exit
soc_camera_exit(void)
1239 platform_driver_unregister(&soc_camera_pdrv
);
1240 driver_unregister(&ic_drv
);
1241 bus_unregister(&soc_camera_bus_type
);
1244 module_init(soc_camera_init
);
1245 module_exit(soc_camera_exit
);
1247 MODULE_DESCRIPTION("Image capture bus driver");
1248 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1249 MODULE_LICENSE("GPL");
1250 MODULE_ALIAS("platform:soc-camera-pdrv");