linux/drivers/media/platform/soc_camera/soc_camera.c

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/*
* camera image capture (abstract) bus driver
*
* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
*
* This driver provides an interface between platform-specific camera
* busses and camera devices. It should be used if the camera is
* connected not over a "proper" bus like PCI or USB, but over a
* special bus, like, for example, the Quick Capture interface on PXA270
* SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
* It can handle multiple cameras and / or multiple busses, which can
* be used, e.g., in stereo-vision applications.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/vmalloc.h>
#include <media/soc_camera.h>
#include <media/v4l2-clk.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-dev.h>
#include <media/videobuf-core.h>
#include <media/videobuf2-core.h>
#include <media/soc_mediabus.h>
/* Default to VGA resolution */
#define DEFAULT_WIDTH 640
#define DEFAULT_HEIGHT 480
#define is_streaming(ici, icd) \
(((ici)->ops->init_videobuf) ? \
(icd)->vb_vidq.streaming : \
vb2_is_streaming(&(icd)->vb2_vidq))
static LIST_HEAD(hosts);
static LIST_HEAD(devices);
static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
int soc_camera_power_on(struct device *dev, struct soc_camera_subdev_desc *ssdd,
struct v4l2_clk *clk)
{
int ret = clk ? v4l2_clk_enable(clk) : 0;
if (ret < 0) {
dev_err(dev, "Cannot enable clock\n");
return ret;
}
ret = regulator_bulk_enable(ssdd->num_regulators,
ssdd->regulators);
if (ret < 0) {
dev_err(dev, "Cannot enable regulators\n");
goto eregenable;;
}
if (ssdd->power) {
ret = ssdd->power(dev, 1);
if (ret < 0) {
dev_err(dev,
"Platform failed to power-on the camera.\n");
goto epwron;
}
}
return 0;
epwron:
regulator_bulk_disable(ssdd->num_regulators,
ssdd->regulators);
eregenable:
if (clk)
v4l2_clk_disable(clk);
return ret;
}
EXPORT_SYMBOL(soc_camera_power_on);
int soc_camera_power_off(struct device *dev, struct soc_camera_subdev_desc *ssdd,
struct v4l2_clk *clk)
{
int ret = 0;
int err;
if (ssdd->power) {
err = ssdd->power(dev, 0);
if (err < 0) {
dev_err(dev,
"Platform failed to power-off the camera.\n");
ret = err;
}
}
err = regulator_bulk_disable(ssdd->num_regulators,
ssdd->regulators);
if (err < 0) {
dev_err(dev, "Cannot disable regulators\n");
ret = ret ? : err;
}
if (clk)
v4l2_clk_disable(clk);
return ret;
}
EXPORT_SYMBOL(soc_camera_power_off);
static int __soc_camera_power_on(struct soc_camera_device *icd)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
int ret;
ret = v4l2_subdev_call(sd, core, s_power, 1);
if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
return ret;
return 0;
}
static int __soc_camera_power_off(struct soc_camera_device *icd)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
int ret;
ret = v4l2_subdev_call(sd, core, s_power, 0);
if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
return ret;
return 0;
}
const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
struct soc_camera_device *icd, unsigned int fourcc)
{
unsigned int i;
for (i = 0; i < icd->num_user_formats; i++)
if (icd->user_formats[i].host_fmt->fourcc == fourcc)
return icd->user_formats + i;
return NULL;
}
EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
/**
* soc_camera_apply_board_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
* @ssdd: camera platform parameters
* @cfg: media bus configuration
* @return: resulting flags
*/
unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
const struct v4l2_mbus_config *cfg)
{
unsigned long f, flags = cfg->flags;
/* If only one of the two polarities is supported, switch to the opposite */
if (ssdd->flags & SOCAM_SENSOR_INVERT_HSYNC) {
f = flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW);
if (f == V4L2_MBUS_HSYNC_ACTIVE_HIGH || f == V4L2_MBUS_HSYNC_ACTIVE_LOW)
flags ^= V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW;
}
if (ssdd->flags & SOCAM_SENSOR_INVERT_VSYNC) {
f = flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW);
if (f == V4L2_MBUS_VSYNC_ACTIVE_HIGH || f == V4L2_MBUS_VSYNC_ACTIVE_LOW)
flags ^= V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW;
}
if (ssdd->flags & SOCAM_SENSOR_INVERT_PCLK) {
f = flags & (V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING);
if (f == V4L2_MBUS_PCLK_SAMPLE_RISING || f == V4L2_MBUS_PCLK_SAMPLE_FALLING)
flags ^= V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
}
return flags;
}
EXPORT_SYMBOL(soc_camera_apply_board_flags);
#define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
((x) >> 24) & 0xff
static int soc_camera_try_fmt(struct soc_camera_device *icd,
struct v4l2_format *f)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
const struct soc_camera_format_xlate *xlate;
struct v4l2_pix_format *pix = &f->fmt.pix;
int ret;
dev_dbg(icd->pdev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
pixfmtstr(pix->pixelformat), pix->width, pix->height);
if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
!(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
pix->bytesperline = 0;
pix->sizeimage = 0;
}
ret = ici->ops->try_fmt(icd, f);
if (ret < 0)
return ret;
xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
if (!xlate)
return -EINVAL;
ret = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt);
if (ret < 0)
return ret;
pix->bytesperline = max_t(u32, pix->bytesperline, ret);
ret = soc_mbus_image_size(xlate->host_fmt, pix->bytesperline,
pix->height);
if (ret < 0)
return ret;
pix->sizeimage = max_t(u32, pix->sizeimage, ret);
return 0;
}
static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct soc_camera_device *icd = file->private_data;
WARN_ON(priv != file->private_data);
/* Only single-plane capture is supported so far */
if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
/* limit format to hardware capabilities */
return soc_camera_try_fmt(icd, f);
}
static int soc_camera_enum_input(struct file *file, void *priv,
struct v4l2_input *inp)
{
if (inp->index != 0)
return -EINVAL;
/* default is camera */
inp->type = V4L2_INPUT_TYPE_CAMERA;
strcpy(inp->name, "Camera");
return 0;
}
static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
{
*i = 0;
return 0;
}
static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
{
if (i > 0)
return -EINVAL;
return 0;
}
static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id a)
{
struct soc_camera_device *icd = file->private_data;
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
return v4l2_subdev_call(sd, core, s_std, a);
}
static int soc_camera_g_std(struct file *file, void *priv, v4l2_std_id *a)
{
struct soc_camera_device *icd = file->private_data;
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
return v4l2_subdev_call(sd, core, g_std, a);
}
static int soc_camera_enum_framesizes(struct file *file, void *fh,
struct v4l2_frmsizeenum *fsize)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
return ici->ops->enum_framesizes(icd, fsize);
}
static int soc_camera_reqbufs(struct file *file, void *priv,
struct v4l2_requestbuffers *p)
{
int ret;
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
WARN_ON(priv != file->private_data);
if (icd->streamer && icd->streamer != file)
return -EBUSY;
if (ici->ops->init_videobuf) {
ret = videobuf_reqbufs(&icd->vb_vidq, p);
if (ret < 0)
return ret;
ret = ici->ops->reqbufs(icd, p);
} else {
ret = vb2_reqbufs(&icd->vb2_vidq, p);
}
if (!ret && !icd->streamer)
icd->streamer = file;
return ret;
}
static int soc_camera_querybuf(struct file *file, void *priv,
struct v4l2_buffer *p)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
WARN_ON(priv != file->private_data);
if (ici->ops->init_videobuf)
return videobuf_querybuf(&icd->vb_vidq, p);
else
return vb2_querybuf(&icd->vb2_vidq, p);
}
static int soc_camera_qbuf(struct file *file, void *priv,
struct v4l2_buffer *p)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
WARN_ON(priv != file->private_data);
if (icd->streamer != file)
return -EBUSY;
if (ici->ops->init_videobuf)
return videobuf_qbuf(&icd->vb_vidq, p);
else
return vb2_qbuf(&icd->vb2_vidq, p);
}
static int soc_camera_dqbuf(struct file *file, void *priv,
struct v4l2_buffer *p)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
WARN_ON(priv != file->private_data);
if (icd->streamer != file)
return -EBUSY;
if (ici->ops->init_videobuf)
return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
else
return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
}
static int soc_camera_create_bufs(struct file *file, void *priv,
struct v4l2_create_buffers *create)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
/* videobuf2 only */
if (ici->ops->init_videobuf)
return -EINVAL;
else
return vb2_create_bufs(&icd->vb2_vidq, create);
}
static int soc_camera_prepare_buf(struct file *file, void *priv,
struct v4l2_buffer *b)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
/* videobuf2 only */
if (ici->ops->init_videobuf)
return -EINVAL;
else
return vb2_prepare_buf(&icd->vb2_vidq, b);
}
/* Always entered with .host_lock held */
static int soc_camera_init_user_formats(struct soc_camera_device *icd)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
unsigned int i, fmts = 0, raw_fmts = 0;
int ret;
enum v4l2_mbus_pixelcode code;
while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
raw_fmts++;
if (!ici->ops->get_formats)
/*
* Fallback mode - the host will have to serve all
* sensor-provided formats one-to-one to the user
*/
fmts = raw_fmts;
else
/*
* First pass - only count formats this host-sensor
* configuration can provide
*/
for (i = 0; i < raw_fmts; i++) {
ret = ici->ops->get_formats(icd, i, NULL);
if (ret < 0)
return ret;
fmts += ret;
}
if (!fmts)
return -ENXIO;
icd->user_formats =
vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
if (!icd->user_formats)
return -ENOMEM;
dev_dbg(icd->pdev, "Found %d supported formats.\n", fmts);
/* Second pass - actually fill data formats */
fmts = 0;
for (i = 0; i < raw_fmts; i++)
if (!ici->ops->get_formats) {
v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
icd->user_formats[fmts].host_fmt =
soc_mbus_get_fmtdesc(code);
if (icd->user_formats[fmts].host_fmt)
icd->user_formats[fmts++].code = code;
} else {
ret = ici->ops->get_formats(icd, i,
&icd->user_formats[fmts]);
if (ret < 0)
goto egfmt;
fmts += ret;
}
icd->num_user_formats = fmts;
icd->current_fmt = &icd->user_formats[0];
return 0;
egfmt:
vfree(icd->user_formats);
return ret;
}
/* Always entered with .host_lock held */
static void soc_camera_free_user_formats(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
if (ici->ops->put_formats)
ici->ops->put_formats(icd);
icd->current_fmt = NULL;
icd->num_user_formats = 0;
vfree(icd->user_formats);
icd->user_formats = NULL;
}
/* Called with .vb_lock held, or from the first open(2), see comment there */
static int soc_camera_set_fmt(struct soc_camera_device *icd,
struct v4l2_format *f)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct v4l2_pix_format *pix = &f->fmt.pix;
int ret;
dev_dbg(icd->pdev, "S_FMT(%c%c%c%c, %ux%u)\n",
pixfmtstr(pix->pixelformat), pix->width, pix->height);
/* We always call try_fmt() before set_fmt() or set_crop() */
ret = soc_camera_try_fmt(icd, f);
if (ret < 0)
return ret;
ret = ici->ops->set_fmt(icd, f);
if (ret < 0) {
return ret;
} else if (!icd->current_fmt ||
icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
dev_err(icd->pdev,
"Host driver hasn't set up current format correctly!\n");
return -EINVAL;
}
icd->user_width = pix->width;
icd->user_height = pix->height;
icd->bytesperline = pix->bytesperline;
icd->sizeimage = pix->sizeimage;
icd->colorspace = pix->colorspace;
icd->field = pix->field;
if (ici->ops->init_videobuf)
icd->vb_vidq.field = pix->field;
dev_dbg(icd->pdev, "set width: %d height: %d\n",
icd->user_width, icd->user_height);
/* set physical bus parameters */
return ici->ops->set_bus_param(icd);
}
static int soc_camera_add_device(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
int ret;
if (ici->icd)
return -EBUSY;
if (!icd->clk) {
ret = ici->ops->clock_start(ici);
if (ret < 0)
return ret;
}
if (ici->ops->add) {
ret = ici->ops->add(icd);
if (ret < 0)
goto eadd;
}
ici->icd = icd;
return 0;
eadd:
if (!icd->clk)
ici->ops->clock_stop(ici);
return ret;
}
static void soc_camera_remove_device(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
if (WARN_ON(icd != ici->icd))
return;
if (ici->ops->remove)
ici->ops->remove(icd);
if (!icd->clk)
ici->ops->clock_stop(ici);
ici->icd = NULL;
}
static int soc_camera_open(struct file *file)
{
struct video_device *vdev = video_devdata(file);
struct soc_camera_device *icd;
struct soc_camera_host *ici;
int ret;
/*
* Don't mess with the host during probe: wait until the loop in
* scan_add_host() completes. Also protect against a race with
* soc_camera_host_unregister().
*/
if (mutex_lock_interruptible(&list_lock))
return -ERESTARTSYS;
if (!vdev || !video_is_registered(vdev)) {
mutex_unlock(&list_lock);
return -ENODEV;
}
icd = video_get_drvdata(vdev);
ici = to_soc_camera_host(icd->parent);
ret = try_module_get(ici->ops->owner) ? 0 : -ENODEV;
mutex_unlock(&list_lock);
if (ret < 0) {
dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
return ret;
}
if (!to_soc_camera_control(icd)) {
/* No device driver attached */
ret = -ENODEV;
goto econtrol;
}
if (mutex_lock_interruptible(&ici->host_lock)) {
ret = -ERESTARTSYS;
goto elockhost;
}
icd->use_count++;
/* Now we really have to activate the camera */
if (icd->use_count == 1) {
struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
/* Restore parameters before the last close() per V4L2 API */
struct v4l2_format f = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.fmt.pix = {
.width = icd->user_width,
.height = icd->user_height,
.field = icd->field,
.colorspace = icd->colorspace,
.pixelformat =
icd->current_fmt->host_fmt->fourcc,
},
};
/* The camera could have been already on, try to reset */
if (sdesc->subdev_desc.reset)
sdesc->subdev_desc.reset(icd->pdev);
ret = soc_camera_add_device(icd);
if (ret < 0) {
dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
goto eiciadd;
}
ret = __soc_camera_power_on(icd);
if (ret < 0)
goto epower;
pm_runtime_enable(&icd->vdev->dev);
ret = pm_runtime_resume(&icd->vdev->dev);
if (ret < 0 && ret != -ENOSYS)
goto eresume;
/*
* Try to configure with default parameters. Notice: this is the
* very first open, so, we cannot race against other calls,
* apart from someone else calling open() simultaneously, but
* .host_lock is protecting us against it.
*/
ret = soc_camera_set_fmt(icd, &f);
if (ret < 0)
goto esfmt;
if (ici->ops->init_videobuf) {
ici->ops->init_videobuf(&icd->vb_vidq, icd);
} else {
ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
if (ret < 0)
goto einitvb;
}
v4l2_ctrl_handler_setup(&icd->ctrl_handler);
}
mutex_unlock(&ici->host_lock);
file->private_data = icd;
dev_dbg(icd->pdev, "camera device open\n");
return 0;
/*
* First four errors are entered with the .host_lock held
* and use_count == 1
*/
einitvb:
esfmt:
pm_runtime_disable(&icd->vdev->dev);
eresume:
__soc_camera_power_off(icd);
epower:
soc_camera_remove_device(icd);
eiciadd:
icd->use_count--;
mutex_unlock(&ici->host_lock);
elockhost:
econtrol:
module_put(ici->ops->owner);
return ret;
}
static int soc_camera_close(struct file *file)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
mutex_lock(&ici->host_lock);
icd->use_count--;
if (!icd->use_count) {
pm_runtime_suspend(&icd->vdev->dev);
pm_runtime_disable(&icd->vdev->dev);
if (ici->ops->init_videobuf2)
vb2_queue_release(&icd->vb2_vidq);
__soc_camera_power_off(icd);
soc_camera_remove_device(icd);
}
if (icd->streamer == file)
icd->streamer = NULL;
mutex_unlock(&ici->host_lock);
module_put(ici->ops->owner);
dev_dbg(icd->pdev, "camera device close\n");
return 0;
}
static ssize_t soc_camera_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
dev_dbg(icd->pdev, "read called, buf %p\n", buf);
if (ici->ops->init_videobuf2 && icd->vb2_vidq.io_modes & VB2_READ)
return vb2_read(&icd->vb2_vidq, buf, count, ppos,
file->f_flags & O_NONBLOCK);
dev_err(icd->pdev, "camera device read not implemented\n");
return -EINVAL;
}
static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
int err;
dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
if (icd->streamer != file)
return -EBUSY;
if (mutex_lock_interruptible(&ici->host_lock))
return -ERESTARTSYS;
if (ici->ops->init_videobuf)
err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
else
err = vb2_mmap(&icd->vb2_vidq, vma);
mutex_unlock(&ici->host_lock);
dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
(unsigned long)vma->vm_start,
(unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
err);
return err;
}
static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
unsigned res = POLLERR;
if (icd->streamer != file)
return POLLERR;
mutex_lock(&ici->host_lock);
if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream))
dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
else
res = ici->ops->poll(file, pt);
mutex_unlock(&ici->host_lock);
return res;
}
void soc_camera_lock(struct vb2_queue *vq)
{
struct soc_camera_device *icd = vb2_get_drv_priv(vq);
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
mutex_lock(&ici->host_lock);
}
EXPORT_SYMBOL(soc_camera_lock);
void soc_camera_unlock(struct vb2_queue *vq)
{
struct soc_camera_device *icd = vb2_get_drv_priv(vq);
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
mutex_unlock(&ici->host_lock);
}
EXPORT_SYMBOL(soc_camera_unlock);
static struct v4l2_file_operations soc_camera_fops = {
.owner = THIS_MODULE,
.open = soc_camera_open,
.release = soc_camera_close,
.unlocked_ioctl = video_ioctl2,
.read = soc_camera_read,
.mmap = soc_camera_mmap,
.poll = soc_camera_poll,
};
static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct soc_camera_device *icd = file->private_data;
int ret;
WARN_ON(priv != file->private_data);
if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
return -EINVAL;
}
if (icd->streamer && icd->streamer != file)
return -EBUSY;
if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
return -EBUSY;
}
ret = soc_camera_set_fmt(icd, f);
if (!ret && !icd->streamer)
icd->streamer = file;
return ret;
}
static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
struct soc_camera_device *icd = file->private_data;
const struct soc_mbus_pixelfmt *format;
WARN_ON(priv != file->private_data);
if (f->index >= icd->num_user_formats)
return -EINVAL;
format = icd->user_formats[f->index].host_fmt;
if (format->name)
strlcpy(f->description, format->name, sizeof(f->description));
f->pixelformat = format->fourcc;
return 0;
}
static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct soc_camera_device *icd = file->private_data;
struct v4l2_pix_format *pix = &f->fmt.pix;
WARN_ON(priv != file->private_data);
if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
pix->width = icd->user_width;
pix->height = icd->user_height;
pix->bytesperline = icd->bytesperline;
pix->sizeimage = icd->sizeimage;
pix->field = icd->field;
pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
pix->colorspace = icd->colorspace;
dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
icd->current_fmt->host_fmt->fourcc);
return 0;
}
static int soc_camera_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
WARN_ON(priv != file->private_data);
strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
return ici->ops->querycap(ici, cap);
}
static int soc_camera_streamon(struct file *file, void *priv,
enum v4l2_buf_type i)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
int ret;
WARN_ON(priv != file->private_data);
if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (icd->streamer != file)
return -EBUSY;
/* This calls buf_queue from host driver's videobuf_queue_ops */
if (ici->ops->init_videobuf)
ret = videobuf_streamon(&icd->vb_vidq);
else
ret = vb2_streamon(&icd->vb2_vidq, i);
if (!ret)
v4l2_subdev_call(sd, video, s_stream, 1);
return ret;
}
static int soc_camera_streamoff(struct file *file, void *priv,
enum v4l2_buf_type i)
{
struct soc_camera_device *icd = file->private_data;
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
WARN_ON(priv != file->private_data);
if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (icd->streamer != file)
return -EBUSY;
/*
* This calls buf_release from host driver's videobuf_queue_ops for all
* remaining buffers. When the last buffer is freed, stop capture
*/
if (ici->ops->init_videobuf)
videobuf_streamoff(&icd->vb_vidq);
else
vb2_streamoff(&icd->vb2_vidq, i);
v4l2_subdev_call(sd, video, s_stream, 0);
return 0;
}
static int soc_camera_cropcap(struct file *file, void *fh,
struct v4l2_cropcap *a)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
return ici->ops->cropcap(icd, a);
}
static int soc_camera_g_crop(struct file *file, void *fh,
struct v4l2_crop *a)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
int ret;
ret = ici->ops->get_crop(icd, a);
return ret;
}
/*
* According to the V4L2 API, drivers shall not update the struct v4l2_crop
* argument with the actual geometry, instead, the user shall use G_CROP to
* retrieve it.
*/
static int soc_camera_s_crop(struct file *file, void *fh,
const struct v4l2_crop *a)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
const struct v4l2_rect *rect = &a->c;
struct v4l2_crop current_crop;
int ret;
if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
rect->width, rect->height, rect->left, rect->top);
current_crop.type = a->type;
/* If get_crop fails, we'll let host and / or client drivers decide */
ret = ici->ops->get_crop(icd, &current_crop);
/* Prohibit window size change with initialised buffers */
if (ret < 0) {
dev_err(icd->pdev,
"S_CROP denied: getting current crop failed\n");
} else if ((a->c.width == current_crop.c.width &&
a->c.height == current_crop.c.height) ||
!is_streaming(ici, icd)) {
/* same size or not streaming - use .set_crop() */
ret = ici->ops->set_crop(icd, a);
} else if (ici->ops->set_livecrop) {
ret = ici->ops->set_livecrop(icd, a);
} else {
dev_err(icd->pdev,
"S_CROP denied: queue initialised and sizes differ\n");
ret = -EBUSY;
}
return ret;
}
static int soc_camera_g_selection(struct file *file, void *fh,
struct v4l2_selection *s)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
/* With a wrong type no need to try to fall back to cropping */
if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (!ici->ops->get_selection)
return -ENOTTY;
return ici->ops->get_selection(icd, s);
}
static int soc_camera_s_selection(struct file *file, void *fh,
struct v4l2_selection *s)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
int ret;
/* In all these cases cropping emulation will not help */
if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
(s->target != V4L2_SEL_TGT_COMPOSE &&
s->target != V4L2_SEL_TGT_CROP))
return -EINVAL;
if (s->target == V4L2_SEL_TGT_COMPOSE) {
/* No output size change during a running capture! */
if (is_streaming(ici, icd) &&
(icd->user_width != s->r.width ||
icd->user_height != s->r.height))
return -EBUSY;
/*
* Only one user is allowed to change the output format, touch
* buffers, start / stop streaming, poll for data
*/
if (icd->streamer && icd->streamer != file)
return -EBUSY;
}
if (!ici->ops->set_selection)
return -ENOTTY;
ret = ici->ops->set_selection(icd, s);
if (!ret &&
s->target == V4L2_SEL_TGT_COMPOSE) {
icd->user_width = s->r.width;
icd->user_height = s->r.height;
if (!icd->streamer)
icd->streamer = file;
}
return ret;
}
static int soc_camera_g_parm(struct file *file, void *fh,
struct v4l2_streamparm *a)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
if (ici->ops->get_parm)
return ici->ops->get_parm(icd, a);
return -ENOIOCTLCMD;
}
static int soc_camera_s_parm(struct file *file, void *fh,
struct v4l2_streamparm *a)
{
struct soc_camera_device *icd = file->private_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
if (ici->ops->set_parm)
return ici->ops->set_parm(icd, a);
return -ENOIOCTLCMD;
}
static int soc_camera_probe(struct soc_camera_device *icd);
/* So far this function cannot fail */
static void scan_add_host(struct soc_camera_host *ici)
{
struct soc_camera_device *icd;
mutex_lock(&list_lock);
list_for_each_entry(icd, &devices, list) {
if (icd->iface == ici->nr) {
icd->parent = ici->v4l2_dev.dev;
soc_camera_probe(icd);
}
}
mutex_unlock(&list_lock);
}
/*
* It is invalid to call v4l2_clk_enable() after a successful probing
* asynchronously outside of V4L2 operations, i.e. with .host_lock not held.
*/
static int soc_camera_clk_enable(struct v4l2_clk *clk)
{
struct soc_camera_device *icd = clk->priv;
struct soc_camera_host *ici;
if (!icd || !icd->parent)
return -ENODEV;
ici = to_soc_camera_host(icd->parent);
if (!try_module_get(ici->ops->owner))
return -ENODEV;
/*
* If a different client is currently being probed, the host will tell
* you to go
*/
return ici->ops->clock_start(ici);
}
static void soc_camera_clk_disable(struct v4l2_clk *clk)
{
struct soc_camera_device *icd = clk->priv;
struct soc_camera_host *ici;
if (!icd || !icd->parent)
return;
ici = to_soc_camera_host(icd->parent);
ici->ops->clock_stop(ici);
module_put(ici->ops->owner);
}
/*
* Eventually, it would be more logical to make the respective host the clock
* owner, but then we would have to copy this struct for each ici. Besides, it
* would introduce the circular dependency problem, unless we port all client
* drivers to release the clock, when not in use.
*/
static const struct v4l2_clk_ops soc_camera_clk_ops = {
.owner = THIS_MODULE,
.enable = soc_camera_clk_enable,
.disable = soc_camera_clk_disable,
};
#ifdef CONFIG_I2C_BOARDINFO
static int soc_camera_init_i2c(struct soc_camera_device *icd,
struct soc_camera_desc *sdesc)
{
struct i2c_client *client;
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct soc_camera_host_desc *shd = &sdesc->host_desc;
struct i2c_adapter *adap = i2c_get_adapter(shd->i2c_adapter_id);
struct v4l2_subdev *subdev;
char clk_name[V4L2_SUBDEV_NAME_SIZE];
int ret;
if (!adap) {
dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
shd->i2c_adapter_id);
return -ENODEV;
}
shd->board_info->platform_data = &sdesc->subdev_desc;
snprintf(clk_name, sizeof(clk_name), "%d-%04x",
shd->i2c_adapter_id, shd->board_info->addr);
icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, "mclk", icd);
if (IS_ERR(icd->clk)) {
ret = PTR_ERR(icd->clk);
goto eclkreg;
}
subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
shd->board_info, NULL);
if (!subdev) {
ret = -ENODEV;
goto ei2cnd;
}
client = v4l2_get_subdevdata(subdev);
/* Use to_i2c_client(dev) to recover the i2c client */
icd->control = &client->dev;
return 0;
ei2cnd:
v4l2_clk_unregister(icd->clk);
icd->clk = NULL;
eclkreg:
i2c_put_adapter(adap);
return ret;
}
static void soc_camera_free_i2c(struct soc_camera_device *icd)
{
struct i2c_client *client =
to_i2c_client(to_soc_camera_control(icd));
struct i2c_adapter *adap = client->adapter;
icd->control = NULL;
v4l2_device_unregister_subdev(i2c_get_clientdata(client));
i2c_unregister_device(client);
i2c_put_adapter(adap);
v4l2_clk_unregister(icd->clk);
icd->clk = NULL;
}
#else
#define soc_camera_init_i2c(icd, sdesc) (-ENODEV)
#define soc_camera_free_i2c(icd) do {} while (0)
#endif
static int soc_camera_video_start(struct soc_camera_device *icd);
static int video_dev_create(struct soc_camera_device *icd);
/* Called during host-driver probe */
static int soc_camera_probe(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
struct soc_camera_host_desc *shd = &sdesc->host_desc;
struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
struct device *control = NULL;
struct v4l2_subdev *sd;
struct v4l2_mbus_framefmt mf;
int ret;
dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
/*
* Currently the subdev with the largest number of controls (13) is
* ov6550. So let's pick 16 as a hint for the control handler. Note
* that this is a hint only: too large and you waste some memory, too
* small and there is a (very) small performance hit when looking up
* controls in the internal hash.
*/
ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
if (ret < 0)
return ret;
/* The camera could have been already on, try to reset */
if (ssdd->reset)
ssdd->reset(icd->pdev);
/* Must have icd->vdev before registering the device */
ret = video_dev_create(icd);
if (ret < 0)
goto evdc;
/*
* ..._video_start() will create a device node, video_register_device()
* itself is protected against concurrent open() calls, but we also have
* to protect our data also during client probing.
*/
mutex_lock(&ici->host_lock);
/* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
if (shd->board_info) {
ret = soc_camera_init_i2c(icd, sdesc);
if (ret < 0)
goto eadd;
} else if (!shd->add_device || !shd->del_device) {
ret = -EINVAL;
goto eadd;
} else {
ret = ici->ops->clock_start(ici);
if (ret < 0)
goto eadd;
if (shd->module_name)
ret = request_module(shd->module_name);
ret = shd->add_device(icd);
if (ret < 0)
goto eadddev;
/*
* FIXME: this is racy, have to use driver-binding notification,
* when it is available
*/
control = to_soc_camera_control(icd);
if (!control || !control->driver || !dev_get_drvdata(control) ||
!try_module_get(control->driver->owner)) {
shd->del_device(icd);
ret = -ENODEV;
goto enodrv;
}
}
sd = soc_camera_to_subdev(icd);
sd->grp_id = soc_camera_grp_id(icd);
v4l2_set_subdev_hostdata(sd, icd);
ret = v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL);
if (ret < 0)
goto ectrl;
/* At this point client .probe() should have run already */
ret = soc_camera_init_user_formats(icd);
if (ret < 0)
goto eiufmt;
icd->field = V4L2_FIELD_ANY;
ret = soc_camera_video_start(icd);
if (ret < 0)
goto evidstart;
/* Try to improve our guess of a reasonable window format */
if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
icd->user_width = mf.width;
icd->user_height = mf.height;
icd->colorspace = mf.colorspace;
icd->field = mf.field;
}
if (!shd->board_info)
ici->ops->clock_stop(ici);
mutex_unlock(&ici->host_lock);
return 0;
evidstart:
soc_camera_free_user_formats(icd);
eiufmt:
ectrl:
if (shd->board_info) {
soc_camera_free_i2c(icd);
} else {
shd->del_device(icd);
module_put(control->driver->owner);
enodrv:
eadddev:
ici->ops->clock_stop(ici);
}
eadd:
video_device_release(icd->vdev);
icd->vdev = NULL;
mutex_unlock(&ici->host_lock);
evdc:
v4l2_ctrl_handler_free(&icd->ctrl_handler);
return ret;
}
/*
* This is called on device_unregister, which only means we have to disconnect
* from the host, but not remove ourselves from the device list
*/
static int soc_camera_remove(struct soc_camera_device *icd)
{
struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
struct video_device *vdev = icd->vdev;
BUG_ON(!icd->parent);
v4l2_ctrl_handler_free(&icd->ctrl_handler);
if (vdev) {
video_unregister_device(vdev);
icd->vdev = NULL;
}
if (sdesc->host_desc.board_info) {
soc_camera_free_i2c(icd);
} else {
struct device_driver *drv = to_soc_camera_control(icd)->driver;
if (drv) {
sdesc->host_desc.del_device(icd);
module_put(drv->owner);
}
}
soc_camera_free_user_formats(icd);
return 0;
}
static int default_cropcap(struct soc_camera_device *icd,
struct v4l2_cropcap *a)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
return v4l2_subdev_call(sd, video, cropcap, a);
}
static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
return v4l2_subdev_call(sd, video, g_crop, a);
}
static int default_s_crop(struct soc_camera_device *icd, const struct v4l2_crop *a)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
return v4l2_subdev_call(sd, video, s_crop, a);
}
static int default_g_parm(struct soc_camera_device *icd,
struct v4l2_streamparm *parm)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
return v4l2_subdev_call(sd, video, g_parm, parm);
}
static int default_s_parm(struct soc_camera_device *icd,
struct v4l2_streamparm *parm)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
return v4l2_subdev_call(sd, video, s_parm, parm);
}
static int default_enum_framesizes(struct soc_camera_device *icd,
struct v4l2_frmsizeenum *fsize)
{
int ret;
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
const struct soc_camera_format_xlate *xlate;
__u32 pixfmt = fsize->pixel_format;
struct v4l2_frmsizeenum fsize_mbus = *fsize;
xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
if (!xlate)
return -EINVAL;
/* map xlate-code to pixel_format, sensor only handle xlate-code*/
fsize_mbus.pixel_format = xlate->code;
ret = v4l2_subdev_call(sd, video, enum_framesizes, &fsize_mbus);
if (ret < 0)
return ret;
*fsize = fsize_mbus;
fsize->pixel_format = pixfmt;
return 0;
}
int soc_camera_host_register(struct soc_camera_host *ici)
{
struct soc_camera_host *ix;
int ret;
if (!ici || !ici->ops ||
!ici->ops->try_fmt ||
!ici->ops->set_fmt ||
!ici->ops->set_bus_param ||
!ici->ops->querycap ||
((!ici->ops->init_videobuf ||
!ici->ops->reqbufs) &&
!ici->ops->init_videobuf2) ||
!ici->ops->clock_start ||
!ici->ops->clock_stop ||
!ici->ops->poll ||
!ici->v4l2_dev.dev)
return -EINVAL;
if (!ici->ops->set_crop)
ici->ops->set_crop = default_s_crop;
if (!ici->ops->get_crop)
ici->ops->get_crop = default_g_crop;
if (!ici->ops->cropcap)
ici->ops->cropcap = default_cropcap;
if (!ici->ops->set_parm)
ici->ops->set_parm = default_s_parm;
if (!ici->ops->get_parm)
ici->ops->get_parm = default_g_parm;
if (!ici->ops->enum_framesizes)
ici->ops->enum_framesizes = default_enum_framesizes;
mutex_lock(&list_lock);
list_for_each_entry(ix, &hosts, list) {
if (ix->nr == ici->nr) {
ret = -EBUSY;
goto edevreg;
}
}
ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
if (ret < 0)
goto edevreg;
list_add_tail(&ici->list, &hosts);
mutex_unlock(&list_lock);
mutex_init(&ici->host_lock);
scan_add_host(ici);
return 0;
edevreg:
mutex_unlock(&list_lock);
return ret;
}
EXPORT_SYMBOL(soc_camera_host_register);
/* Unregister all clients! */
void soc_camera_host_unregister(struct soc_camera_host *ici)
{
struct soc_camera_device *icd;
mutex_lock(&list_lock);
list_del(&ici->list);
list_for_each_entry(icd, &devices, list)
if (icd->iface == ici->nr && to_soc_camera_control(icd))
soc_camera_remove(icd);
mutex_unlock(&list_lock);
v4l2_device_unregister(&ici->v4l2_dev);
}
EXPORT_SYMBOL(soc_camera_host_unregister);
/* Image capture device */
static int soc_camera_device_register(struct soc_camera_device *icd)
{
struct soc_camera_device *ix;
int num = -1, i;
for (i = 0; i < 256 && num < 0; i++) {
num = i;
/* Check if this index is available on this interface */
list_for_each_entry(ix, &devices, list) {
if (ix->iface == icd->iface && ix->devnum == i) {
num = -1;
break;
}
}
}
if (num < 0)
/*
* ok, we have 256 cameras on this host...
* man, stay reasonable...
*/
return -ENOMEM;
icd->devnum = num;
icd->use_count = 0;
icd->host_priv = NULL;
list_add_tail(&icd->list, &devices);
return 0;
}
static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
.vidioc_querycap = soc_camera_querycap,
.vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
.vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
.vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
.vidioc_enum_input = soc_camera_enum_input,
.vidioc_g_input = soc_camera_g_input,
.vidioc_s_input = soc_camera_s_input,
.vidioc_s_std = soc_camera_s_std,
.vidioc_g_std = soc_camera_g_std,
.vidioc_enum_framesizes = soc_camera_enum_framesizes,
.vidioc_reqbufs = soc_camera_reqbufs,
.vidioc_querybuf = soc_camera_querybuf,
.vidioc_qbuf = soc_camera_qbuf,
.vidioc_dqbuf = soc_camera_dqbuf,
.vidioc_create_bufs = soc_camera_create_bufs,
.vidioc_prepare_buf = soc_camera_prepare_buf,
.vidioc_streamon = soc_camera_streamon,
.vidioc_streamoff = soc_camera_streamoff,
.vidioc_cropcap = soc_camera_cropcap,
.vidioc_g_crop = soc_camera_g_crop,
.vidioc_s_crop = soc_camera_s_crop,
.vidioc_g_selection = soc_camera_g_selection,
.vidioc_s_selection = soc_camera_s_selection,
.vidioc_g_parm = soc_camera_g_parm,
.vidioc_s_parm = soc_camera_s_parm,
};
static int video_dev_create(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct video_device *vdev = video_device_alloc();
if (!vdev)
return -ENOMEM;
strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
vdev->v4l2_dev = &ici->v4l2_dev;
vdev->fops = &soc_camera_fops;
vdev->ioctl_ops = &soc_camera_ioctl_ops;
vdev->release = video_device_release;
vdev->ctrl_handler = &icd->ctrl_handler;
vdev->lock = &ici->host_lock;
icd->vdev = vdev;
return 0;
}
/*
* Called from soc_camera_probe() above with .host_lock held
*/
static int soc_camera_video_start(struct soc_camera_device *icd)
{
const struct device_type *type = icd->vdev->dev.type;
int ret;
if (!icd->parent)
return -ENODEV;
video_set_drvdata(icd->vdev, icd);
ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
if (ret < 0) {
dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
return ret;
}
/* Restore device type, possibly set by the subdevice driver */
icd->vdev->dev.type = type;
return 0;
}
static int soc_camera_pdrv_probe(struct platform_device *pdev)
{
struct soc_camera_desc *sdesc = pdev->dev.platform_data;
struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
struct soc_camera_device *icd;
int ret;
if (!sdesc)
return -EINVAL;
icd = devm_kzalloc(&pdev->dev, sizeof(*icd), GFP_KERNEL);
if (!icd)
return -ENOMEM;
ret = devm_regulator_bulk_get(&pdev->dev, ssdd->num_regulators,
ssdd->regulators);
if (ret < 0)
return ret;
icd->iface = sdesc->host_desc.bus_id;
icd->sdesc = sdesc;
icd->pdev = &pdev->dev;
platform_set_drvdata(pdev, icd);
icd->user_width = DEFAULT_WIDTH;
icd->user_height = DEFAULT_HEIGHT;
return soc_camera_device_register(icd);
}
/*
* Only called on rmmod for each platform device, since they are not
* hot-pluggable. Now we know, that all our users - hosts and devices have
* been unloaded already
*/
static int soc_camera_pdrv_remove(struct platform_device *pdev)
{
struct soc_camera_device *icd = platform_get_drvdata(pdev);
if (!icd)
return -EINVAL;
list_del(&icd->list);
return 0;
}
static struct platform_driver __refdata soc_camera_pdrv = {
.probe = soc_camera_pdrv_probe,
.remove = soc_camera_pdrv_remove,
.driver = {
.name = "soc-camera-pdrv",
.owner = THIS_MODULE,
},
};
module_platform_driver(soc_camera_pdrv);
MODULE_DESCRIPTION("Image capture bus driver");
MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:soc-camera-pdrv");