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// SPDX-License-Identifier: GPL-2.0
/*
* camera image capture (abstract) bus driver
*
* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
*
* This driver provides an interface between platform-specific camera
* buses 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 buses, which can
* be used, e.g., in stereo-vision applications.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <media/soc_camera.h>
#include <media/drv-intf/soc_mediabus.h>
#include <media/v4l2-async.h>
#include <media/v4l2-clk.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fwnode.h>
#include <media/videobuf2-v4l2.h>
/* Default to VGA resolution */
#define DEFAULT_WIDTH 640
#define DEFAULT_HEIGHT 480
#define MAP_MAX_NUM 32
static DECLARE_BITMAP(device_map, MAP_MAX_NUM);
static LIST_HEAD(hosts);
static LIST_HEAD(devices);
/*
* Protects lists and bitmaps of hosts and devices.
* Lock nesting: Ok to take ->host_lock under list_lock.
*/
static DEFINE_MUTEX(list_lock);
struct soc_camera_async_client {
struct v4l2_async_subdev *sensor;
struct v4l2_async_notifier notifier;
struct platform_device *pdev;
struct list_head list; /* needed for clean up */
};
static int soc_camera_video_start(struct soc_camera_device *icd);
static int video_dev_create(struct soc_camera_device *icd);
int soc_camera_power_on(struct device *dev, struct soc_camera_subdev_desc *ssdd,
struct v4l2_clk *clk)
{
int ret;
bool clock_toggle;
if (clk && (!ssdd->unbalanced_power ||
!test_and_set_bit(0, &ssdd->clock_state))) {
ret = v4l2_clk_enable(clk);
if (ret < 0) {
dev_err(dev, "Cannot enable clock: %d\n", ret);
return ret;
}
clock_toggle = true;
} else {
clock_toggle = false;
}
ret = regulator_bulk_enable(ssdd->sd_pdata.num_regulators,
ssdd->sd_pdata.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->sd_pdata.num_regulators,
ssdd->sd_pdata.regulators);
eregenable:
if (clock_toggle)
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->sd_pdata.num_regulators,
ssdd->sd_pdata.regulators);
if (err < 0) {
dev_err(dev, "Cannot disable regulators\n");
ret = ret ? : err;
}
if (clk && (!ssdd->unbalanced_power || test_and_clear_bit(0, &ssdd->clock_state)))
v4l2_clk_disable(clk);
return ret;
}
EXPORT_SYMBOL(soc_camera_power_off);
int soc_camera_power_init(struct device *dev, struct soc_camera_subdev_desc *ssdd)
{
/* Should not have any effect in synchronous case */
return devm_regulator_bulk_get(dev, ssdd->sd_pdata.num_regulators,
ssdd->sd_pdata.regulators);
}
EXPORT_SYMBOL(soc_camera_power_init);
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;
}
static int soc_camera_clock_start(struct soc_camera_host *ici)
{
int ret;
if (!ici->ops->clock_start)
return 0;
mutex_lock(&ici->clk_lock);
ret = ici->ops->clock_start(ici);
mutex_unlock(&ici->clk_lock);
return ret;
}
static void soc_camera_clock_stop(struct soc_camera_host *ici)
{
if (!ici->ops->clock_stop)
return;
mutex_lock(&ici->clk_lock);
ici->ops->clock_stop(ici);
mutex_unlock(&ici->clk_lock);
}
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)
{
struct soc_camera_device *icd = file->private_data;
if (inp->index != 0)
return -EINVAL;
/* default is camera */
inp->type = V4L2_INPUT_TYPE_CAMERA;
inp->std = icd->vdev->tvnorms;
strscpy(inp->name, "Camera", sizeof(inp->name));
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, video, 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, video, 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;
WARN_ON(priv != file->private_data);
if (icd->streamer && icd->streamer != file)
return -EBUSY;
ret = vb2_reqbufs(&icd->vb2_vidq, p);
if (!ret)
icd->streamer = p->count ? file : NULL;
return ret;
}
static int soc_camera_querybuf(struct file *file, void *priv,
struct v4l2_buffer *p)
{
struct soc_camera_device *icd = file->private_data;
WARN_ON(priv != file->private_data);
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;
WARN_ON(priv != file->private_data);
if (icd->streamer != file)
return -EBUSY;
return vb2_qbuf(&icd->vb2_vidq, NULL, p);
}
static int soc_camera_dqbuf(struct file *file, void *priv,
struct v4l2_buffer *p)
{
struct soc_camera_device *icd = file->private_data;
WARN_ON(priv != file->private_data);
if (icd->streamer != file)
return -EBUSY;
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;
int ret;
if (icd->streamer && icd->streamer != file)
return -EBUSY;
ret = vb2_create_bufs(&icd->vb2_vidq, create);
if (!ret)
icd->streamer = file;
return ret;
}
static int soc_camera_prepare_buf(struct file *file, void *priv,
struct v4l2_buffer *b)
{
struct soc_camera_device *icd = file->private_data;
return vb2_prepare_buf(&icd->vb2_vidq, NULL, b);
}
static int soc_camera_expbuf(struct file *file, void *priv,
struct v4l2_exportbuffer *p)
{
struct soc_camera_device *icd = file->private_data;
if (icd->streamer && icd->streamer != file)
return -EBUSY;
return vb2_expbuf(&icd->vb2_vidq, p);
}
/* 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;
struct v4l2_subdev_mbus_code_enum code = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
while (!v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code)) {
raw_fmts++;
code.index++;
}
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(array_size(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) {
code.index = i;
v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code);
icd->user_formats[fmts].host_fmt =
soc_mbus_get_fmtdesc(code.code);
if (icd->user_formats[fmts].host_fmt)
icd->user_formats[fmts++].code = 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_selection() */
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;
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 = soc_camera_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)
soc_camera_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)
soc_camera_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)
if (icd->control)
sdesc->subdev_desc.reset(icd->control);
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;
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;
/*
* All errors are entered with the .host_lock held, first four also
* with 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);
if (icd->streamer == file) {
if (ici->ops->init_videobuf2)
vb2_queue_release(&icd->vb2_vidq);
icd->streamer = NULL;
}
icd->use_count--;
if (!icd->use_count) {
pm_runtime_suspend(&icd->vdev->dev);
pm_runtime_disable(&icd->vdev->dev);
__soc_camera_power_off(icd);
soc_camera_remove_device(icd);
}
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=%p\n", vma);
if (icd->streamer != file)
return -EBUSY;
if (mutex_lock_interruptible(&ici->host_lock))
return -ERESTARTSYS;
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 __poll_t 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);
__poll_t res = EPOLLERR;
if (icd->streamer != file)
return EPOLLERR;
mutex_lock(&ici->host_lock);
res = ici->ops->poll(file, pt);
mutex_unlock(&ici->host_lock);
return res;
}
static const 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 (vb2_is_streaming(&icd->vb2_vidq)) {
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)
strscpy(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);
strscpy(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 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 videobuf2_queue_ops */
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);
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_release from host driver's videobuf2_queue_ops for all
* remaining buffers. When the last buffer is freed, stop capture
*/
ret = vb2_streamoff(&icd->vb2_vidq, i);
v4l2_subdev_call(sd, video, s_stream, 0);
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;
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 (vb2_is_streaming(&icd->vb2_vidq) &&
(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 (s->target == V4L2_SEL_TGT_CROP &&
vb2_is_streaming(&icd->vb2_vidq) &&
ici->ops->set_liveselection)
ret = ici->ops->set_liveselection(icd, s);
else
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_host *ici,
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) {
struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
/* The camera could have been already on, try to reset */
if (ssdd->reset)
if (icd->control)
ssdd->reset(icd->control);
icd->parent = ici->v4l2_dev.dev;
/* Ignore errors */
soc_camera_probe(ici, 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 soc_camera_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);
soc_camera_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,
};
static int soc_camera_dyn_pdev(struct soc_camera_desc *sdesc,
struct soc_camera_async_client *sasc)
{
struct platform_device *pdev;
int ret, i;
mutex_lock(&list_lock);
i = find_first_zero_bit(device_map, MAP_MAX_NUM);
if (i < MAP_MAX_NUM)
set_bit(i, device_map);
mutex_unlock(&list_lock);
if (i >= MAP_MAX_NUM)
return -ENOMEM;
pdev = platform_device_alloc("soc-camera-pdrv", i);
if (!pdev)
return -ENOMEM;
ret = platform_device_add_data(pdev, sdesc, sizeof(*sdesc));
if (ret < 0) {
platform_device_put(pdev);
return ret;
}
sasc->pdev = pdev;
return 0;
}
static struct soc_camera_device *soc_camera_add_pdev(struct soc_camera_async_client *sasc)
{
struct platform_device *pdev = sasc->pdev;
int ret;
ret = platform_device_add(pdev);
if (ret < 0 || !pdev->dev.driver)
return NULL;
return platform_get_drvdata(pdev);
}
/* Locking: called with .host_lock held */
static int soc_camera_probe_finish(struct soc_camera_device *icd)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct v4l2_subdev_format fmt = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
struct v4l2_mbus_framefmt *mf = &fmt.format;
int ret;
sd->grp_id = soc_camera_grp_id(icd);
v4l2_set_subdev_hostdata(sd, icd);
v4l2_subdev_call(sd, video, g_tvnorms, &icd->vdev->tvnorms);
ret = v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler,
NULL, true);
if (ret < 0)
return ret;
ret = soc_camera_add_device(icd);
if (ret < 0) {
dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
return ret;
}
/* At this point client .probe() should have run already */
ret = soc_camera_init_user_formats(icd);
if (ret < 0)
goto eusrfmt;
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, pad, get_fmt, NULL, &fmt)) {
icd->user_width = mf->width;
icd->user_height = mf->height;
icd->colorspace = mf->colorspace;
icd->field = mf->field;
}
soc_camera_remove_device(icd);
return 0;
evidstart:
soc_camera_free_user_formats(icd);
eusrfmt:
soc_camera_remove_device(icd);
return ret;
}
#ifdef CONFIG_I2C_BOARDINFO
static int soc_camera_i2c_init(struct soc_camera_device *icd,
struct soc_camera_desc *sdesc)
{
struct soc_camera_subdev_desc *ssdd;
struct i2c_client *client;
struct soc_camera_host *ici;
struct soc_camera_host_desc *shd = &sdesc->host_desc;
struct i2c_adapter *adap;
struct v4l2_subdev *subdev;
char clk_name[V4L2_CLK_NAME_SIZE];
int ret;
/* First find out how we link the main client */
if (icd->sasc) {
/* Async non-OF probing handled by the subdevice list */
return -EPROBE_DEFER;
}
ici = to_soc_camera_host(icd->parent);
adap = i2c_get_adapter(shd->i2c_adapter_id);
if (!adap) {
dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
shd->i2c_adapter_id);
return -ENODEV;
}
ssdd = kmemdup(&sdesc->subdev_desc, sizeof(*ssdd), GFP_KERNEL);
if (!ssdd) {
ret = -ENOMEM;
goto ealloc;
}
/*
* In synchronous case we request regulators ourselves in
* soc_camera_pdrv_probe(), make sure the subdevice driver doesn't try
* to allocate them again.
*/
ssdd->sd_pdata.num_regulators = 0;
ssdd->sd_pdata.regulators = NULL;
shd->board_info->platform_data = ssdd;
v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
shd->i2c_adapter_id, shd->board_info->addr);
icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, 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:
kfree(ssdd);
ealloc:
i2c_put_adapter(adap);
return ret;
}
static void soc_camera_i2c_free(struct soc_camera_device *icd)
{
struct i2c_client *client =
to_i2c_client(to_soc_camera_control(icd));
struct i2c_adapter *adap;
struct soc_camera_subdev_desc *ssdd;
icd->control = NULL;
if (icd->sasc)
return;
adap = client->adapter;
ssdd = client->dev.platform_data;
v4l2_device_unregister_subdev(i2c_get_clientdata(client));
i2c_unregister_device(client);
i2c_put_adapter(adap);
kfree(ssdd);
v4l2_clk_unregister(icd->clk);
icd->clk = NULL;
}
/*
* V4L2 asynchronous notifier callbacks. They are all called under a v4l2-async
* internal global mutex, therefore cannot race against other asynchronous
* events. Until notifier->complete() (soc_camera_async_complete()) is called,
* the video device node is not registered and no V4L fops can occur. Unloading
* of the host driver also calls a v4l2-async function, so also there we're
* protected.
*/
static int soc_camera_async_bound(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd,
struct v4l2_async_subdev *asd)
{
struct soc_camera_async_client *sasc = container_of(notifier,
struct soc_camera_async_client, notifier);
struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
if (asd == sasc->sensor && !WARN_ON(icd->control)) {
struct i2c_client *client = v4l2_get_subdevdata(sd);
/*
* Only now we get subdevice-specific information like
* regulators, flags, callbacks, etc.
*/
if (client) {
struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
struct soc_camera_subdev_desc *ssdd =
soc_camera_i2c_to_desc(client);
if (ssdd) {
memcpy(&sdesc->subdev_desc, ssdd,
sizeof(sdesc->subdev_desc));
if (ssdd->reset)
ssdd->reset(&client->dev);
}
icd->control = &client->dev;
}
}
return 0;
}
static void soc_camera_async_unbind(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd,
struct v4l2_async_subdev *asd)
{
struct soc_camera_async_client *sasc = container_of(notifier,
struct soc_camera_async_client, notifier);
struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
icd->control = NULL;
if (icd->clk) {
v4l2_clk_unregister(icd->clk);
icd->clk = NULL;
}
}
static int soc_camera_async_complete(struct v4l2_async_notifier *notifier)
{
struct soc_camera_async_client *sasc = container_of(notifier,
struct soc_camera_async_client, notifier);
struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
if (to_soc_camera_control(icd)) {
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
int ret;
mutex_lock(&list_lock);
ret = soc_camera_probe(ici, icd);
mutex_unlock(&list_lock);
if (ret < 0)
return ret;
}
return 0;
}
static const struct v4l2_async_notifier_operations soc_camera_async_ops = {
.bound = soc_camera_async_bound,
.unbind = soc_camera_async_unbind,
.complete = soc_camera_async_complete,
};
static int scan_async_group(struct soc_camera_host *ici,
struct v4l2_async_subdev **asd, unsigned int size)
{
struct soc_camera_async_subdev *sasd;
struct soc_camera_async_client *sasc;
struct soc_camera_device *icd;
struct soc_camera_desc sdesc = {.host_desc.bus_id = ici->nr,};
char clk_name[V4L2_CLK_NAME_SIZE];
unsigned int i;
int ret;
/* First look for a sensor */
for (i = 0; i < size; i++) {
sasd = container_of(asd[i], struct soc_camera_async_subdev, asd);
if (sasd->role == SOCAM_SUBDEV_DATA_SOURCE)
break;
}
if (i >= size || asd[i]->match_type != V4L2_ASYNC_MATCH_I2C) {
/* All useless */
dev_err(ici->v4l2_dev.dev, "No I2C data source found!\n");
return -ENODEV;
}
/* Or shall this be managed by the soc-camera device? */
sasc = devm_kzalloc(ici->v4l2_dev.dev, sizeof(*sasc), GFP_KERNEL);
if (!sasc)
return -ENOMEM;
/* HACK: just need a != NULL */
sdesc.host_desc.board_info = ERR_PTR(-ENODATA);
ret = soc_camera_dyn_pdev(&sdesc, sasc);
if (ret < 0)
goto eallocpdev;
sasc->sensor = &sasd->asd;
icd = soc_camera_add_pdev(sasc);
if (!icd) {
ret = -ENOMEM;
goto eaddpdev;
}
v4l2_async_notifier_init(&sasc->notifier);
for (i = 0; i < size; i++) {
ret = v4l2_async_notifier_add_subdev(&sasc->notifier, asd[i]);
if (ret)
goto eaddasd;
}
sasc->notifier.ops = &soc_camera_async_ops;
icd->sasc = sasc;
icd->parent = ici->v4l2_dev.dev;
v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
sasd->asd.match.i2c.adapter_id,
sasd->asd.match.i2c.address);
icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
if (IS_ERR(icd->clk)) {
ret = PTR_ERR(icd->clk);
goto eclkreg;
}
ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
if (!ret)
return 0;
v4l2_clk_unregister(icd->clk);
eclkreg:
icd->clk = NULL;
eaddasd:
v4l2_async_notifier_cleanup(&sasc->notifier);
platform_device_del(sasc->pdev);
eaddpdev:
platform_device_put(sasc->pdev);
eallocpdev:
devm_kfree(ici->v4l2_dev.dev, sasc);
dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
return ret;
}
static void scan_async_host(struct soc_camera_host *ici)
{
struct v4l2_async_subdev **asd;
int j;
for (j = 0, asd = ici->asd; ici->asd_sizes[j]; j++) {
scan_async_group(ici, asd, ici->asd_sizes[j]);
asd += ici->asd_sizes[j];
}
}
#else
#define soc_camera_i2c_init(icd, sdesc) (-ENODEV)
#define soc_camera_i2c_free(icd) do {} while (0)
#define scan_async_host(ici) do {} while (0)
#endif
#ifdef CONFIG_OF
struct soc_of_info {
struct soc_camera_async_subdev sasd;
struct soc_camera_async_client sasc;
struct v4l2_async_subdev *subdev;
};
static int soc_of_bind(struct soc_camera_host *ici,
struct device_node *ep,
struct device_node *remote)
{
struct soc_camera_device *icd;
struct soc_camera_desc sdesc = {.host_desc.bus_id = ici->nr,};
struct soc_camera_async_client *sasc;
struct soc_of_info *info;
struct i2c_client *client;
char clk_name[V4L2_CLK_NAME_SIZE];
int ret;
/* allocate a new subdev and add match info to it */
info = devm_kzalloc(ici->v4l2_dev.dev, sizeof(struct soc_of_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
info->sasd.asd.match.fwnode = of_fwnode_handle(remote);
info->sasd.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
info->subdev = &info->sasd.asd;
/* Or shall this be managed by the soc-camera device? */
sasc = &info->sasc;
/* HACK: just need a != NULL */
sdesc.host_desc.board_info = ERR_PTR(-ENODATA);
ret = soc_camera_dyn_pdev(&sdesc, sasc);
if (ret < 0)
goto eallocpdev;
sasc->sensor = &info->sasd.asd;
icd = soc_camera_add_pdev(sasc);
if (!icd) {
ret = -ENOMEM;
goto eaddpdev;
}
v4l2_async_notifier_init(&sasc->notifier);
ret = v4l2_async_notifier_add_subdev(&sasc->notifier, info->subdev);
if (ret) {
of_node_put(remote);
goto eaddasd;
}
sasc->notifier.ops = &soc_camera_async_ops;
icd->sasc = sasc;
icd->parent = ici->v4l2_dev.dev;
client = of_find_i2c_device_by_node(remote);
if (client)
v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
client->adapter->nr, client->addr);
else
v4l2_clk_name_of(clk_name, sizeof(clk_name), remote);
icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
if (IS_ERR(icd->clk)) {
ret = PTR_ERR(icd->clk);
goto eclkreg;
}
ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
if (!ret)
return 0;
v4l2_clk_unregister(icd->clk);
eclkreg:
icd->clk = NULL;
eaddasd:
v4l2_async_notifier_cleanup(&sasc->notifier);
platform_device_del(sasc->pdev);
eaddpdev:
platform_device_put(sasc->pdev);
eallocpdev:
devm_kfree(ici->v4l2_dev.dev, info);
dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
return ret;
}
static void scan_of_host(struct soc_camera_host *ici)
{
struct device *dev = ici->v4l2_dev.dev;
struct device_node *np = dev->of_node;
struct device_node *epn = NULL, *rem;
unsigned int i;
for (i = 0; ; i++) {
epn = of_graph_get_next_endpoint(np, epn);
if (!epn)
break;
rem = of_graph_get_remote_port_parent(epn);
if (!rem) {
dev_notice(dev, "no remote for %pOF\n", epn);
continue;
}
/* so we now have a remote node to connect */
if (!i)
soc_of_bind(ici, epn, rem);
if (i) {
dev_err(dev, "multiple subdevices aren't supported yet!\n");
break;
}
}
of_node_put(epn);
}
#else
static inline void scan_of_host(struct soc_camera_host *ici) { }
#endif
/* Called during host-driver probe */
static int soc_camera_probe(struct soc_camera_host *ici,
struct soc_camera_device *icd)
{
struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
struct soc_camera_host_desc *shd = &sdesc->host_desc;
struct device *control = NULL;
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;
/* 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.
*/
/* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
if (shd->board_info) {
ret = soc_camera_i2c_init(icd, sdesc);
if (ret < 0 && ret != -EPROBE_DEFER)
goto eadd;
} else if (!shd->add_device || !shd->del_device) {
ret = -EINVAL;
goto eadd;
} else {
ret = soc_camera_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;
}
}
mutex_lock(&ici->host_lock);
ret = soc_camera_probe_finish(icd);
mutex_unlock(&ici->host_lock);
if (ret < 0)
goto efinish;
return 0;
efinish:
if (shd->board_info) {
soc_camera_i2c_free(icd);
} else {
shd->del_device(icd);
module_put(control->driver->owner);
enodrv:
eadddev:
soc_camera_clock_stop(ici);
}
eadd:
if (icd->vdev) {
video_device_release(icd->vdev);
icd->vdev = NULL;
}
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. With
* asynchronous client probing this can also be called without
* soc_camera_probe_finish() having run. Careful with clean up.
*/
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;
v4l2_ctrl_handler_free(&icd->ctrl_handler);
if (vdev) {
video_unregister_device(vdev);
icd->vdev = NULL;
}
if (sdesc->host_desc.board_info) {
soc_camera_i2c_free(icd);
} else {
struct device *dev = to_soc_camera_control(icd);
struct device_driver *drv = dev ? dev->driver : NULL;
if (drv) {
sdesc->host_desc.del_device(icd);
module_put(drv->owner);
}
}
if (icd->num_user_formats)
soc_camera_free_user_formats(icd);
if (icd->clk) {
/* For the synchronous case */
v4l2_clk_unregister(icd->clk);
icd->clk = NULL;
}
if (icd->sasc)
platform_device_unregister(icd->sasc->pdev);
return 0;
}
static int default_g_selection(struct soc_camera_device *icd,
struct v4l2_selection *sel)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct v4l2_subdev_selection sdsel = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
.target = sel->target,
};
int ret;
ret = v4l2_subdev_call(sd, pad, get_selection, NULL, &sdsel);
if (ret)
return ret;
sel->r = sdsel.r;
return 0;
}
static int default_s_selection(struct soc_camera_device *icd,
struct v4l2_selection *sel)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct v4l2_subdev_selection sdsel = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
.target = sel->target,
.flags = sel->flags,
.r = sel->r,
};
int ret;
ret = v4l2_subdev_call(sd, pad, set_selection, NULL, &sdsel);
if (ret)
return ret;
sel->r = sdsel.r;
return 0;
}
static int default_g_parm(struct soc_camera_device *icd,
struct v4l2_streamparm *a)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
return v4l2_g_parm_cap(icd->vdev, sd, a);
}
static int default_s_parm(struct soc_camera_device *icd,
struct v4l2_streamparm *a)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
return v4l2_s_parm_cap(icd->vdev, sd, a);
}
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;
struct v4l2_subdev_frame_size_enum fse = {
.index = fsize->index,
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
xlate = soc_camera_xlate_by_fourcc(icd, fsize->pixel_format);
if (!xlate)
return -EINVAL;
fse.code = xlate->code;
ret = v4l2_subdev_call(sd, pad, enum_frame_size, NULL, &fse);
if (ret < 0)
return ret;
if (fse.min_width == fse.max_width &&
fse.min_height == fse.max_height) {
fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
fsize->discrete.width = fse.min_width;
fsize->discrete.height = fse.min_height;
return 0;
}
fsize->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
fsize->stepwise.min_width = fse.min_width;
fsize->stepwise.max_width = fse.max_width;
fsize->stepwise.min_height = fse.min_height;
fsize->stepwise.max_height = fse.max_height;
fsize->stepwise.step_width = 1;
fsize->stepwise.step_height = 1;
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_videobuf2 ||
!ici->ops->poll ||
!ici->v4l2_dev.dev)
return -EINVAL;
if (!ici->ops->set_selection)
ici->ops->set_selection = default_s_selection;
if (!ici->ops->get_selection)
ici->ops->get_selection = default_g_selection;
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);
mutex_init(&ici->clk_lock);
if (ici->v4l2_dev.dev->of_node)
scan_of_host(ici);
else if (ici->asd_sizes)
/*
* No OF, host with a list of subdevices. Don't try to mix
* modes by initialising some groups statically and some
* dynamically!
*/
scan_async_host(ici);
else
/* Legacy: static platform devices from board data */
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, *tmp;
struct soc_camera_async_client *sasc;
LIST_HEAD(notifiers);
mutex_lock(&list_lock);
list_del(&ici->list);
list_for_each_entry(icd, &devices, list)
if (icd->iface == ici->nr && icd->sasc) {
/* as long as we hold the device, sasc won't be freed */
get_device(icd->pdev);
list_add(&icd->sasc->list, &notifiers);
}
mutex_unlock(&list_lock);
list_for_each_entry(sasc, &notifiers, list) {
/* Must call unlocked to avoid AB-BA dead-lock */
v4l2_async_notifier_unregister(&sasc->notifier);
v4l2_async_notifier_cleanup(&sasc->notifier);
put_device(&sasc->pdev->dev);
}
mutex_lock(&list_lock);
list_for_each_entry_safe(icd, tmp, &devices, list)
if (icd->iface == ici->nr)
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;
mutex_lock(&list_lock);
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...
*/
mutex_unlock(&list_lock);
return -ENOMEM;
}
icd->devnum = num;
icd->use_count = 0;
icd->host_priv = NULL;
/*
* Dynamically allocated devices set the bit earlier, but it doesn't hurt setting
* it again
*/
i = to_platform_device(icd->pdev)->id;
if (i < 0)
/* One static (legacy) soc-camera platform device */
i = 0;
if (i >= MAP_MAX_NUM) {
mutex_unlock(&list_lock);
return -EBUSY;
}
set_bit(i, device_map);
list_add_tail(&icd->list, &devices);
mutex_unlock(&list_lock);
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_expbuf = soc_camera_expbuf,
.vidioc_streamon = soc_camera_streamon,
.vidioc_streamoff = soc_camera_streamoff,
.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;
strscpy(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);
if (icd->vdev->tvnorms == 0) {
/* disable the STD API if there are no tvnorms defined */
v4l2_disable_ioctl(icd->vdev, VIDIOC_G_STD);
v4l2_disable_ioctl(icd->vdev, VIDIOC_S_STD);
v4l2_disable_ioctl(icd->vdev, VIDIOC_ENUMSTD);
}
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;
/*
* In the asynchronous case ssdd->num_regulators == 0 yet, so, the below
* regulator allocation is a dummy. They are actually requested by the
* subdevice driver, using soc_camera_power_init(). Also note, that in
* that case regulators are attached to the I2C device and not to the
* camera platform device.
*/
ret = devm_regulator_bulk_get(&pdev->dev, ssdd->sd_pdata.num_regulators,
ssdd->sd_pdata.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);
int i;
if (!icd)
return -EINVAL;
i = pdev->id;
if (i < 0)
i = 0;
/*
* In synchronous mode with static platform devices this is called in a
* loop from drivers/base/dd.c::driver_detach(), no parallel execution,
* no need to lock. In asynchronous case the caller -
* soc_camera_host_unregister() - already holds the lock
*/
if (test_bit(i, device_map)) {
clear_bit(i, device_map);
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",
},
};
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");
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