diff options
Diffstat (limited to 'drivers/staging/media/soc_camera/soc_camera.c')
| -rw-r--r-- | drivers/staging/media/soc_camera/soc_camera.c | 2170 |
1 files changed, 2170 insertions, 0 deletions
diff --git a/drivers/staging/media/soc_camera/soc_camera.c b/drivers/staging/media/soc_camera/soc_camera.c new file mode 100644 index 000000000000..1ab86a7499b9 --- /dev/null +++ b/drivers/staging/media/soc_camera/soc_camera.c @@ -0,0 +1,2170 @@ +/* + * 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. + * + * 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/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, ¬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); + 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"); |