Re: [RFCv1 PATCH 1/7] gspca: allow subdrivers to use the control framework.

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On Sat May 5 2012 09:43:01 Hans de Goede wrote:
> Hi,
> 
> I'm slowly working my way though this series today (both review, as well
> as some tweaks and testing).

Thanks for that!

One note: I initialized the controls in sd_init. That's wrong, it should be
sd_config. sd_init is also called on resume, so that would initialize the
controls twice.

I'm working on this as well today, together with finishing the stv06xx and
mars conversion.

I will also do some suspend/resume testing today to check whether the controls
are put back correctly after a resume.

Regards,

	Hans

> 
> More comments inline...
> 
> On 04/28/2012 05:09 PM, Hans Verkuil wrote:
> > From: Hans Verkuil<hans.verkuil@xxxxxxxxx>
> >
> > Make the necessary changes to allow subdrivers to use the control framework.
> > This does not add control event support, that needs more work.
> >
> > Signed-off-by: Hans Verkuil<hans.verkuil@xxxxxxxxx>
> > ---
> >   drivers/media/video/gspca/gspca.c |   13 +++++++++----
> >   1 file changed, 9 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
> > index ca5a2b1..56dff10 100644
> > --- a/drivers/media/video/gspca/gspca.c
> > +++ b/drivers/media/video/gspca/gspca.c
> > @@ -38,6 +38,7 @@
> >   #include<linux/uaccess.h>
> >   #include<linux/ktime.h>
> >   #include<media/v4l2-ioctl.h>
> > +#include<media/v4l2-ctrls.h>
> >
> >   #include "gspca.h"
> >
> > @@ -1006,6 +1007,8 @@ static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
> >
> >   	/* set the current control values to their default values
> >   	 * which may have changed in sd_init() */
> > +	/* does nothing if ctrl_handler == NULL */
> > +	v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
> >   	ctrl = gspca_dev->cam.ctrls;
> >   	if (ctrl != NULL) {
> >   		for (i = 0;
> > @@ -1323,6 +1326,7 @@ static void gspca_release(struct video_device *vfd)
> >   	PDEBUG(D_PROBE, "%s released",
> >   		video_device_node_name(&gspca_dev->vdev));
> >
> > +	v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
> >   	kfree(gspca_dev->usb_buf);
> >   	kfree(gspca_dev);
> >   }
> > @@ -2347,6 +2351,10 @@ int gspca_dev_probe2(struct usb_interface *intf,
> >   	gspca_dev->sd_desc = sd_desc;
> >   	gspca_dev->nbufread = 2;
> >   	gspca_dev->empty_packet = -1;	/* don't check the empty packets */
> > +	gspca_dev->vdev = gspca_template;
> > +	gspca_dev->vdev.parent =&intf->dev;
> > +	gspca_dev->module = module;
> > +	gspca_dev->present = 1;
> >
> >   	/* configure the subdriver and initialize the USB device */
> >   	ret = sd_desc->config(gspca_dev, id);
> 
> You also need to move the initialization of the mutexes here, as the
> v4l2_ctrl_handler_setup will call s_ctrl on all the controls, and s_ctrl
> should take the usb_lock (see my review of the next patch in this series),
> I'll make this change myself and merge it into your patch.
> 
> > @@ -2368,10 +2376,6 @@ int gspca_dev_probe2(struct usb_interface *intf,
> >   	init_waitqueue_head(&gspca_dev->wq);
> >
> >   	/* init video stuff */
> > -	memcpy(&gspca_dev->vdev,&gspca_template, sizeof gspca_template);
> > -	gspca_dev->vdev.parent =&intf->dev;
> > -	gspca_dev->module = module;
> > -	gspca_dev->present = 1;
> >   	ret = video_register_device(&gspca_dev->vdev,
> >   				  VFL_TYPE_GRABBER,
> >   				  -1);
> > @@ -2391,6 +2395,7 @@ out:
> >   	if (gspca_dev->input_dev)
> >   		input_unregister_device(gspca_dev->input_dev);
> >   #endif
> > +	v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
> >   	kfree(gspca_dev->usb_buf);
> >   	kfree(gspca_dev);
> >   	return ret;
> 
> Otherwise looks good, I've added it to my local tree (with the
> described change), and will include it in my next pullreq.
> 
> Regards,
> 
> Hans
> 
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