--- /dev/null
+/*
+ * 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/module.h>
+#include <linux/mutex.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/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-of.h>
+#include <media/videobuf-core.h>
+#include <media/videobuf2-core.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))
+
+#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)
+{
+ 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, 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;
+ 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);
+}
+
+static int soc_camera_expbuf(struct file *file, void *priv,
+ struct v4l2_exportbuffer *p)
+{
+ struct soc_camera_device *icd = file->private_data;
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+
+ if (icd->streamer != file)
+ return -EBUSY;
+
+ /* videobuf2 only */
+ if (ici->ops->init_videobuf)
+ return -EINVAL;
+ else
+ 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;
+ u32 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 = 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;
+
+ 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;
+
+ /*
+ * 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);
+ 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;
+}
+
+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, ¤t_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_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_mbus_framefmt mf;
+ 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);
+ 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, video, g_mbus_fmt, &mf)) {
+ 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_SUBDEV_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;
+
+ 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, 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);
+
+ 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 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_SUBDEV_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;
+ }
+
+ sasc->notifier.subdevs = asd;
+ sasc->notifier.num_subdevs = size;
+ sasc->notifier.bound = soc_camera_async_bound;
+ sasc->notifier.unbind = soc_camera_async_unbind;
+ sasc->notifier.complete = soc_camera_async_complete;
+
+ icd->sasc = sasc;
+ icd->parent = ici->v4l2_dev.dev;
+
+ snprintf(clk_name, sizeof(clk_name), "%d-%04x",
+ 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;
+ 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_SUBDEV_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.of.node = remote;
+ info->sasd.asd.match_type = V4L2_ASYNC_MATCH_OF;
+ 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;
+ }
+
+ sasc->notifier.subdevs = &info->subdev;
+ sasc->notifier.num_subdevs = 1;
+ sasc->notifier.bound = soc_camera_async_bound;
+ sasc->notifier.unbind = soc_camera_async_unbind;
+ sasc->notifier.complete = soc_camera_async_complete;
+
+ icd->sasc = sasc;
+ icd->parent = ici->v4l2_dev.dev;
+
+ client = of_find_i2c_device_by_node(remote);
+
+ if (client)
+ snprintf(clk_name, sizeof(clk_name), "%d-%04x",
+ client->adapter->nr, client->addr);
+ else
+ snprintf(clk_name, sizeof(clk_name), "of-%s",
+ of_node_full_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;
+ 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, *ren;
+ unsigned int i;
+
+ for (i = 0; ; i++) {
+ epn = of_graph_get_next_endpoint(np, epn);
+ if (!epn)
+ break;
+
+ ren = of_graph_get_remote_port(epn);
+ if (!ren) {
+ dev_notice(dev, "no remote for %s\n",
+ of_node_full_name(epn));
+ continue;
+ }
+
+ /* so we now have a remote node to connect */
+ if (!i)
+ soc_of_bind(ici, epn, ren->parent);
+
+ of_node_put(ren);
+
+ 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_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;
+ 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_videobuf ||
+ !ici->ops->reqbufs) &&
+ !ici->ops->init_videobuf2) ||
+ !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);
+ 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, ¬ifiers);
+ }
+ mutex_unlock(&list_lock);
+
+ list_for_each_entry(sasc, ¬ifiers, list) {
+ /* Must call unlocked to avoid AB-BA dead-lock */
+ v4l2_async_notifier_unregister(&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_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);
+ 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");
Code Review / kvmfornfv.git / blobdiff