Re: [PATCH v2] media: soc-camera: OF cameras

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Hi Bryan,

On Mon, 24 Feb 2014, Bryan Wu wrote:

> On Tue, Feb 18, 2014 at 10:40 AM, Bryan Wu <cooloney@xxxxxxxxx> wrote:
> > On Wed, Feb 12, 2014 at 12:05 PM, Bryan Wu <cooloney@xxxxxxxxx> wrote:
> >> From: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
> >>
> >> With OF we aren't getting platform data any more. To minimise changes we
> >> create all the missing data ourselves, including compulsory struct
> >> soc_camera_link objects. Host-client linking is now done, based on the OF
> >> data. Media bus numbers also have to be assigned dynamically.
> >>
> >> OF probing reuses the V4L2 Async API which is used by async non-OF probing.
> >>
> >> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
> >
> > Hi Guennadi,
> >
> > Do you have chance to review my v2 patch?

I looked at it briefly, the direction looks good now, but I'll have to 
find time to properly review it.

Thanks
Guennadi

> >> Signed-off-by: Bryan Wu <pengw@xxxxxxxxxx>
> >> ---
> >> v2:
> >>  - move to use V4L2 Async API
> >>  - cleanup some coding style issue
> >>  - allocate struct soc_camera_desc sdesc on stack
> >>  - cleanup unbalanced mutex operation
> >>
> >>  drivers/media/platform/soc_camera/soc_camera.c | 232 ++++++++++++++++++++++++-
> >>  include/media/soc_camera.h                     |   5 +
> >>  2 files changed, 233 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
> >> index 4b8c024..ffe1254 100644
> >> --- a/drivers/media/platform/soc_camera/soc_camera.c
> >> +++ b/drivers/media/platform/soc_camera/soc_camera.c
> >> @@ -23,6 +23,7 @@
> >>  #include <linux/list.h>
> >>  #include <linux/module.h>
> >>  #include <linux/mutex.h>
> >> +#include <linux/of.h>
> >>  #include <linux/platform_device.h>
> >>  #include <linux/pm_runtime.h>
> >>  #include <linux/regulator/consumer.h>
> >> @@ -36,6 +37,7 @@
> >>  #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>
> >>
> >> @@ -49,6 +51,7 @@
> >>          vb2_is_streaming(&(icd)->vb2_vidq))
> >>
> >>  #define MAP_MAX_NUM 32
> >> +static DECLARE_BITMAP(host_map, MAP_MAX_NUM);
> >>  static DECLARE_BITMAP(device_map, MAP_MAX_NUM);
> >>  static LIST_HEAD(hosts);
> >>  static LIST_HEAD(devices);
> >> @@ -65,6 +68,17 @@ struct soc_camera_async_client {
> >>         struct list_head list;          /* needed for clean up */
> >>  };
> >>
> >> +struct soc_camera_of_client {
> >> +       struct soc_camera_desc *sdesc;
> >> +       struct soc_camera_async_client sasc;
> >> +       struct v4l2_of_endpoint node;
> >> +       struct dev_archdata archdata;
> >> +       struct device_node *link_node;
> >> +       union {
> >> +               struct i2c_board_info i2c_info;
> >> +       };
> >> +};
> >> +
> >>  static int soc_camera_video_start(struct soc_camera_device *icd);
> >>  static int video_dev_create(struct soc_camera_device *icd);
> >>
> >> @@ -1336,6 +1350,10 @@ static int soc_camera_i2c_init(struct soc_camera_device *icd,
> >>                 return -EPROBE_DEFER;
> >>         }
> >>
> >> +       /* OF probing skips following I2C init */
> >> +       if (shd->host_wait)
> >> +               return 0;
> >> +
> >>         ici = to_soc_camera_host(icd->parent);
> >>         adap = i2c_get_adapter(shd->i2c_adapter_id);
> >>         if (!adap) {
> >> @@ -1573,10 +1591,180 @@ static void scan_async_host(struct soc_camera_host *ici)
> >>                 asd += ici->asd_sizes[j];
> >>         }
> >>  }
> >> +
> >> +static void soc_camera_of_i2c_ifill(struct soc_camera_of_client *sofc,
> >> +                                   struct i2c_client *client)
> >> +{
> >> +       struct i2c_board_info *info = &sofc->i2c_info;
> >> +       struct soc_camera_desc *sdesc = sofc->sdesc;
> >> +
> >> +       /* on OF I2C devices platform_data == NULL */
> >> +       info->flags = client->flags;
> >> +       info->addr = client->addr;
> >> +       info->irq = client->irq;
> >> +       info->archdata = &sofc->archdata;
> >> +
> >> +       /* archdata is always empty on OF I2C devices */
> >> +       strlcpy(info->type, client->name, sizeof(info->type));
> >> +
> >> +       sdesc->host_desc.i2c_adapter_id = client->adapter->nr;
> >> +}
> >> +
> >> +static void soc_camera_of_i2c_info(struct device_node *node,
> >> +                                  struct soc_camera_of_client *sofc)
> >> +{
> >> +       struct i2c_client *client;
> >> +       struct soc_camera_desc *sdesc = sofc->sdesc;
> >> +       struct i2c_board_info *info = &sofc->i2c_info;
> >> +       struct device_node *port, *sensor, *bus;
> >> +
> >> +       port = v4l2_of_get_remote_port(node);
> >> +       if (!port)
> >> +               return;
> >> +
> >> +       /* Check the bus */
> >> +       sensor = of_get_parent(port);
> >> +       bus = of_get_parent(sensor);
> >> +
> >> +       if (of_node_cmp(bus->name, "i2c")) {
> >> +               of_node_put(port);
> >> +               of_node_put(sensor);
> >> +               of_node_put(bus);
> >> +               return;
> >> +       }
> >> +
> >> +       info->of_node = sensor;
> >> +       sdesc->host_desc.board_info = info;
> >> +
> >> +       client = of_find_i2c_device_by_node(sensor);
> >> +       /*
> >> +        * of_i2c_register_devices() took a reference to the OF node, it is not
> >> +        * dropped, when the I2C device is removed, so, we don't need an
> >> +        * additional reference.
> >> +        */
> >> +       of_node_put(sensor);
> >> +       if (client) {
> >> +               soc_camera_of_i2c_ifill(sofc, client);
> >> +               sofc->link_node = sensor;
> >> +               put_device(&client->dev);
> >> +       }
> >> +
> >> +       /* client hasn't attached to I2C yet */
> >> +}
> >> +
> >> +static struct soc_camera_of_client *soc_camera_of_alloc_client(const struct soc_camera_host *ici,
> >> +                                                              struct device_node *node)
> >> +{
> >> +       struct soc_camera_of_client *sofc;
> >> +       struct v4l2_async_subdev *sensor;
> >> +       struct soc_camera_desc sdesc = { .host_desc.host_wait = true,};
> >> +       int i, ret;
> >> +
> >> +       sofc = devm_kzalloc(ici->v4l2_dev.dev, sizeof(*sofc), GFP_KERNEL);
> >> +       if (!sofc)
> >> +               return NULL;
> >> +
> >> +       /* Allocate v4l2_async_subdev by ourselves */
> >> +       sensor = devm_kzalloc(ici->v4l2_dev.dev, sizeof(*sensor), GFP_KERNEL);
> >> +       if (!sensor)
> >> +               return NULL;
> >> +       sofc->sasc.sensor = sensor;
> >> +
> >> +       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 NULL;
> >> +       sofc->sasc.pdev = platform_device_alloc("soc-camera-pdrv", i);
> >> +       if (!sofc->sasc.pdev)
> >> +               return NULL;
> >> +
> >> +       sdesc.host_desc.node = &sofc->node;
> >> +       sdesc.host_desc.bus_id = ici->nr;
> >> +
> >> +       ret = platform_device_add_data(sofc->sasc.pdev, &sdesc, sizeof(sdesc));
> >> +       if (ret < 0)
> >> +               return NULL;
> >> +       sofc->sdesc = sofc->sasc.pdev->dev.platform_data;
> >> +
> >> +       soc_camera_of_i2c_info(node, sofc);
> >> +
> >> +       return sofc;
> >> +}
> >> +
> >> +static void scan_of_host(struct soc_camera_host *ici)
> >> +{
> >> +       struct soc_camera_of_client *sofc;
> >> +       struct soc_camera_async_client *sasc;
> >> +       struct v4l2_async_subdev *asd;
> >> +       struct soc_camera_device *icd;
> >> +       struct device_node *node = NULL;
> >> +
> >> +       for (;;) {
> >> +               int ret;
> >> +
> >> +               node = v4l2_of_get_next_endpoint(ici->v4l2_dev.dev->of_node,
> >> +                                              node);
> >> +               if (!node)
> >> +                       break;
> >> +
> >> +               sofc = soc_camera_of_alloc_client(ici, node);
> >> +               if (!sofc) {
> >> +                       dev_err(ici->v4l2_dev.dev,
> >> +                               "%s(): failed to create a client device\n",
> >> +                               __func__);
> >> +                       of_node_put(node);
> >> +                       break;
> >> +               }
> >> +               v4l2_of_parse_endpoint(node, &sofc->node);
> >> +
> >> +               sasc = &sofc->sasc;
> >> +               ret = platform_device_add(sasc->pdev);
> >> +               if (ret < 0) {
> >> +                       /* Useless thing, but keep trying */
> >> +                       platform_device_put(sasc->pdev);
> >> +                       of_node_put(node);
> >> +                       continue;
> >> +               }
> >> +
> >> +               /* soc_camera_pdrv_probe() probed successfully */
> >> +               icd = platform_get_drvdata(sasc->pdev);
> >> +               if (!icd) {
> >> +                       /* Cannot be... */
> >> +                       platform_device_put(sasc->pdev);
> >> +                       of_node_put(node);
> >> +                       continue;
> >> +               }
> >> +
> >> +               asd = sasc->sensor;
> >> +               asd->match_type = V4L2_ASYNC_MATCH_OF;
> >> +               asd->match.of.node = sofc->link_node;
> >> +
> >> +               sasc->notifier.subdevs = &asd;
> >> +               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->parent = ici->v4l2_dev.dev;
> >> +
> >> +               ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
> >> +               if (!ret)
> >> +                       break;
> >> +
> >> +               /*
> >> +                * We could destroy the icd in there error case here, but the
> >> +                * non-OF version doesn't do that, so, we can keep it around too
> >> +                */
> >> +       }
> >> +}
> >>  #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)
> >> +#define scan_of_host(ici)              do {} while (0)
> >>  #endif
> >>
> >>  /* Called during host-driver probe */
> >> @@ -1689,6 +1877,7 @@ 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;
> >> +       struct v4l2_of_endpoint *node = sdesc->host_desc.node;
> >>
> >>         v4l2_ctrl_handler_free(&icd->ctrl_handler);
> >>         if (vdev) {
> >> @@ -1719,6 +1908,17 @@ static int soc_camera_remove(struct soc_camera_device *icd)
> >>         if (icd->sasc)
> >>                 platform_device_unregister(icd->sasc->pdev);
> >>
> >> +       if (node) {
> >> +               struct soc_camera_of_client *sofc = container_of(node,
> >> +                                       struct soc_camera_of_client, node);
> >> +               /* Don't dead-lock: remove the device here under the lock */
> >> +               clear_bit(sofc->sasc.pdev->id, device_map);
> >> +               list_del(&icd->list);
> >> +               if (sofc->link_node)
> >> +                       of_node_put(sofc->link_node);
> >> +               platform_device_unregister(sofc->sasc.pdev);
> >> +       }
> >> +
> >>         return 0;
> >>  }
> >>
> >> @@ -1813,17 +2013,34 @@ int soc_camera_host_register(struct soc_camera_host *ici)
> >>                 ici->ops->enum_framesizes = default_enum_framesizes;
> >>
> >>         mutex_lock(&list_lock);
> >> -       list_for_each_entry(ix, &hosts, list) {
> >> -               if (ix->nr == ici->nr) {
> >> +       if (ici->nr == (unsigned char)-1) {
> >> +               /* E.g. OF host: dynamic number */
> >> +               /* TODO: consider using IDR */
> >> +               ici->nr = find_first_zero_bit(host_map, MAP_MAX_NUM);
> >> +               if (ici->nr >= MAP_MAX_NUM) {
> >>                         ret = -EBUSY;
> >>                         goto edevreg;
> >>                 }
> >> +       } else {
> >> +               if (ici->nr >= MAP_MAX_NUM) {
> >> +                       ret = -EINVAL;
> >> +                       goto edevreg;
> >> +               }
> >> +
> >> +               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;
> >>
> >> +       set_bit(ici->nr, host_map);
> >> +
> >>         list_add_tail(&ici->list, &hosts);
> >>         mutex_unlock(&list_lock);
> >>
> >> @@ -1837,9 +2054,11 @@ int soc_camera_host_register(struct soc_camera_host *ici)
> >>                  * dynamically!
> >>                  */
> >>                 scan_async_host(ici);
> >> -       else
> >> +       else if (!ici->v4l2_dev.dev->of_node)
> >>                 /* Legacy: static platform devices from board data */
> >>                 scan_add_host(ici);
> >> +       else    /* Scan subdevices from OF info */
> >> +               scan_of_host(ici);
> >>
> >>         return 0;
> >>
> >> @@ -1857,6 +2076,8 @@ void soc_camera_host_unregister(struct soc_camera_host *ici)
> >>         LIST_HEAD(notifiers);
> >>
> >>         mutex_lock(&list_lock);
> >> +
> >> +       clear_bit(ici->nr, host_map);
> >>         list_del(&ici->list);
> >>         list_for_each_entry(icd, &devices, list)
> >>                 if (icd->iface == ici->nr && icd->sasc) {
> >> @@ -1875,7 +2096,10 @@ void soc_camera_host_unregister(struct soc_camera_host *ici)
> >>         mutex_lock(&list_lock);
> >>
> >>         list_for_each_entry_safe(icd, tmp, &devices, list)
> >> -               if (icd->iface == ici->nr)
> >> +               if (icd->iface == ici->nr &&
> >> +                   icd->parent == ici->v4l2_dev.dev &&
> >> +                   (to_soc_camera_control(icd) ||
> >> +                       icd->sdesc->host_desc.host_wait))
> >>                         soc_camera_remove(icd);
> >>
> >>         mutex_unlock(&list_lock);
> >> diff --git a/include/media/soc_camera.h b/include/media/soc_camera.h
> >> index 865246b..06b03b1 100644
> >> --- a/include/media/soc_camera.h
> >> +++ b/include/media/soc_camera.h
> >> @@ -138,6 +138,7 @@ struct soc_camera_host_ops {
> >>
> >>  struct i2c_board_info;
> >>  struct regulator_bulk_data;
> >> +struct v4l2_of_endpoint;
> >>
> >>  struct soc_camera_subdev_desc {
> >>         /* Per camera SOCAM_SENSOR_* bus flags */
> >> @@ -177,7 +178,9 @@ struct soc_camera_host_desc {
> >>         int bus_id;
> >>         int i2c_adapter_id;
> >>         struct i2c_board_info *board_info;
> >> +       struct v4l2_of_endpoint *node;
> >>         const char *module_name;
> >> +       bool host_wait;
> >>
> >>         /*
> >>          * For non-I2C devices platform has to provide methods to add a device
> >> @@ -242,7 +245,9 @@ struct soc_camera_link {
> >>         int bus_id;
> >>         int i2c_adapter_id;
> >>         struct i2c_board_info *board_info;
> >> +       struct v4l2_of_endpoint *node;
> >>         const char *module_name;
> >> +       bool host_wait;
> >>
> >>         /*
> >>          * For non-I2C devices platform has to provide methods to add a device
> >> --
> >> 1.8.3.2
> >>
> 
> 
> I have to ping it again.
> 
> -Bryan
> 

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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