- 27 Jul, 2011 40 commits
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Hans Verkuil authored
Normally no control events will go to the filehandle that called the VIDIOC_S_CTRL/VIDIOC_S_EXT_CTRLS ioctls. This is to prevent a feedback loop. This can now be overridden by setting the new V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK flag. Based on suggestions from Mauro Carvalho Chehab <mchehab@redhat.com> and Laurent Pinchart <laurent.pinchart@ideasonboard.com>. Signed-off-by:
Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by:
Mauro Carvalho Chehab <mchehab@redhat.com>
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Hans Verkuil authored
It's getting confusing who is linking to what, so add an overview at the start of the header. Signed-off-by:
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Hans Verkuil authored
Thanks to Laurent Pinchart <laurent.pinchart@ideasonboard.com>. Signed-off-by:
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Hans Verkuil authored
Starting with v3.1 the V4L2 API provides certain guarantees with respect to events. Document these. Signed-off-by:
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Hans Verkuil authored
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Hans Verkuil authored
v4l2_fh_init now returns void instead of int, updated the doc. Signed-off-by:
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Hans Verkuil authored
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Hans Verkuil authored
Split try_or_set_ext_ctrls() into a validate_ctrls() part ('Phase 1') and merge the second part ('Phase 2') into try_set_ext_ctrls(). This makes a lot more sense and it also does the validation before trying to try/set the controls. Signed-off-by: -
Hans Verkuil authored
The implementation of VIDIOC_G/S/TRY_EXT_CTRLS in the control framework has to figure out which controls in the control list belong to the same cluster. Since controls belonging to the same cluster need to be handled as a unit, this is important information. It did that by going over the controls in the list and for each control that belonged to a multi-control cluster it would walk the remainder of the list to try and find controls that belong to that same cluster. This approach has two disadvantages: 1) it was a potentially quadratic algorithm (although highly unlikely that it would ever be that bad in practice). 2) it took place with the control handler's lock held. Since we want to make it possible in the future to change control values from interrupt context, doing a lot of work while holding a lock is not a good idea. In the new code the algorithm is no longer quadratic but linear in the number of controls in the list. Also, it now can be done beforehand. Another change that was made was to so the try and set at the same time. Before when S_TRY_EXT_CTRLS was called it would 'try' the controls first, and then it would 'set' them. The idea was that any 'try' errors would prevent the 'set' from happening, thus avoiding having partially set control lists. However, this caused more problems than it solved because between the 'try' and the 'set' changes might have happened, so it had to try a second time, and since actual controls with a try_ctrl op are very rare (and those that we have just adjust values and do not return an error), I've decided to drop that two-stage approach and just combine try and set. Signed-off-by:
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Hans Verkuil authored
When sending the SEND_INITIAL event for write-only controls the V4L2_EVENT_CTRL_CH_VALUE flag should not be set. It's meaningless. Signed-off-by:
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Hans Verkuil authored
When the event queue for a subscribed event is full, then the oldest event is dropped. It would be nice if the contents of that oldest event could be merged with the next-oldest. That way no information is lost, only intermediate steps are lost. This patch adds optional replace() (called when only one kevent was allocated) and merge() (called when more than one kevent was allocated) callbacks that will be called to do this job. These two callbacks are implemented for the V4L2_EVENT_CTRL event. Signed-off-by:
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Hans Verkuil authored
The driver had to decide how many events to allocate when the v4l2_fh struct was created. It was possible to add more events afterwards, but there was no way to ensure that you wouldn't miss important events if the event queue would fill up for that filehandle. In addition, once there were no more free events, any new events were simply dropped on the floor. For the control event in particular this made life very difficult since control status/value changes could just be missed if the number of allocated events and the speed at which the application read events was too low to keep up with the number of generated events. The application would have no idea what the latest state was for a control since it could have missed the latest control change. So this patch makes some major changes in how events are allocated. Instead of allocating events per-filehandle they are now allocated when subscribing an event. So for that particular event type N events (determined by the driver) are allocated. Those events are reserved for that particular event type. This ensures that you will not miss events for a particular type altogether. In addition, if there are N events in use and a new event is raised, then the oldest event is dropped and the new one is added. So the latest event is always available. This can be further improved by adding the ability to merge the state of two events together, ensuring that no data is lost at all. This will be added in the next patch. This also makes it possible to allow the user to determine the number of events that will be allocated. This is not implemented at the moment, but would be trivial. Signed-off-by:
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Hans Verkuil authored
The v4l2_ctrl_fh struct connected v4l2_ctrl with v4l2_fh so the control would know which filehandles subscribed to it. However, it is much easier to use struct v4l2_subscribed_event directly for that and get rid of that intermediate struct. Signed-off-by:
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Hans Verkuil authored
Drivers that supported events used to be rare, but now that controls can also raise events this will become much more common since almost all drivers have controls. This means that keeping struct v4l2_events as a separate struct make no more sense. Merging it into struct v4l2_fh simplifies things substantially as it is now an integral part of the filehandle struct. Signed-off-by:
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Andrew Chew authored
On suspend, remember whether we are streaming or not, and at what frame format, so that on resume, we can start streaming again. Signed-off-by:
Andrew Chew <achew@nvidia.com> Signed-off-by:
Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by:
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Andrew Chew authored
This is to avoid needing a forward declaration when ov9740_s_power() (in the subsequent patch) calls ov9740_s_fmt(). Signed-off-by:
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Andrew Chew authored
Derive resolution-dependent register settings programmatically. Signed-off-by:
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Andrew Chew authored
Based on vendor feedback, should issue a software reset at start of day. Also, OV9740_ANALOG_CTRL15 needs to be changed so the sensor does not begin streaming until it is ready (otherwise, results in a nonsense frame for the initial frame). Added a comment on using discontinuous clock. Finally, OV9740_ISP_CTRL19 needs to be changed to really use YUYV ordering (the previous value was for VYUY). Signed-off-by:
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Andrew Chew authored
The register width of the ov9740 is 16-bits, so correct the debug print to reflect this. Signed-off-by:
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Andrew Chew authored
Made all hex number casing use lower-case throughout the entire driver for consistency. Signed-off-by:
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Josh Wu authored
This patch is to enable Atmel Image Sensor Interface (ISI) driver support. Signed-off-by:
Josh Wu <josh.wu@atmel.com> Acked-by:
Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by:
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Guennadi Liakhovetski authored
This patch removes .enum_input(), .suspend() and .resume() soc-camera client operations. Functionality, provided by .enum_input(), if needed, can be implemented using the v4l2-subdev API. As for .suspend() and .resume(), the only client driver, implementing these methods has been mt9m111, and the only host driver, using them has been pxa-camera. Now that both those drivers have been converted to the standard subdev .s_power() operation, .suspend() and .resume() can be removed. Signed-off-by:
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Guennadi Liakhovetski authored
Eliminate soc-camera specific .suspend() and .restore() methods in favour of the standard v4l2-subdev .s_power() method Signed-off-by:
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Guennadi Liakhovetski authored
It is more convenient to propagate the higher level abstraction - the struct mt9m111 object into functions and then retrieve a pointer to the i2c client, if needed, than to do the reverse. Signed-off-by:
Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by:
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Guennadi Liakhovetski authored
SOCAM_MIPI_[1234]LANE flags are not board-specific sensor flags, they are bus configuration flags. Signed-off-by:
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Guennadi Liakhovetski authored
tw9910 is a TV decoder, it doesn't have a tuner. Besides, the .enum_input soc-camera operation is optional and normally not needed. Signed-off-by:
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Guennadi Liakhovetski authored
soc_camera core now performs the standard .bytesperline and .sizeimage calculations internally, no need to duplicate in drivers. Signed-off-by:
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Guennadi Liakhovetski authored
If the user is requesting too large a frame, instead of failing select an acceptable geometry, preserving the requested aspect ratio. Signed-off-by:
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Guennadi Liakhovetski authored
soc-camera specific .suspend() and .resume() methods are deprecated and should be replaced by the subdev standard .s_power() operation. Signed-off-by:
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Guennadi Liakhovetski authored
The pxa-camera driver only supports progressive video so far. Passing down to the client the same format, as what the user has requested can result in interlaced video, even if the client supports both. This patch avoids such cases. Signed-off-by:
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Guennadi Liakhovetski authored
soc_camera core now performs the standard .bytesperline and .sizeimage calculations internally, no need to duplicate in drivers. Signed-off-by:
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Guennadi Liakhovetski authored
soc_camera core now performs the standard .bytesperline and .sizeimage calculations internally, no need to duplicate in drivers. Signed-off-by:
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Hans Verkuil authored
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Hans Verkuil authored
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Hans Verkuil authored
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Hans Verkuil authored
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Hans Verkuil authored
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Hans Verkuil authored
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Hans Verkuil authored
Whenever a control changes value or state an event is sent to anyone that subscribed to it. This functionality is useful for control panels but also for applications that need to wait for (usually status) controls to change value. Signed-off-by:
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Hans Verkuil authored
When an application changes a control you want to generate an event. However, you want to avoid sending such an event back to the application (file handle) that caused the change. Add the filehandle to the various set control functions. The filehandle isn't used yet, but the control event patches will need this. Signed-off-by:
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