Re: ATMEL camera interface
Hi, So I have decided to go with the v4l2-subdev API. I have taken the omapxxcam and vivi.c as exemple, but I have some questions... I still don't understand how to register a v4l2 device. I tried to copy the method from vivi.c using v4l2_device_register but it is not working? If I just use video_regiter_device, then it is trying to use the default ioctl and open/close functions from v4l2(v4l2_open) instead of the one I hae in my driver... What am I doing wrong? BR, Sedji Le 5/3/2010 6:40 PM, Guennadi Liakhovetski a écrit : On Mon, 3 May 2010, Sedji Gaouaou wrote: Well sorry to bother you again but I am looking at the mx1_camera.c file, and I wonder where are implemented the queue and dqueue functions? The atmel IP is using linked list for the buffers, and previously I was managing it in the queue and dqueue functions. I am not sure where I should take care of it now? qbuf and dqbuf are implemented by soc-camera in soc_camera_qbuf() and soc_camera_dqbuf() respectively, drivers only implement methods from struct videobuf_queue_ops, e.g., a .buf_queue method, which for mx1_camera is implemented by mx1_videobuf_queue(). Thanks Guennadi Regards, Sedji Le 5/3/2010 4:26 PM, Guennadi Liakhovetski a écrit : On Mon, 3 May 2010, Sedji Gaouaou wrote: Well I need contiguous memory, so I guess I will have a look at mx1_camera.c? Is there another example? What do you mean by videobuf implementation? As I said I just need a contiguous memory. I mean, whether you're gping to use videobuf-dma-contig.c or videobuf-dma-sg.c, respectively, whether you'll be calling videobuf_queue_dma_contig_init() or videobuf_queue_sg_init() in your driver. Regards Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: ATMEL camera interface
On Mon, 3 May 2010, Sedji Gaouaou wrote: > Well sorry to bother you again but I am looking at the mx1_camera.c file, and > I wonder where are implemented the queue and dqueue functions? > > The atmel IP is using linked list for the buffers, and previously I was > managing it in the queue and dqueue functions. > I am not sure where I should take care of it now? qbuf and dqbuf are implemented by soc-camera in soc_camera_qbuf() and soc_camera_dqbuf() respectively, drivers only implement methods from struct videobuf_queue_ops, e.g., a .buf_queue method, which for mx1_camera is implemented by mx1_videobuf_queue(). Thanks Guennadi > > > Regards, > Sedji > > Le 5/3/2010 4:26 PM, Guennadi Liakhovetski a écrit : > > On Mon, 3 May 2010, Sedji Gaouaou wrote: > > > > > Well I need contiguous memory, so I guess I will have a look at > > > mx1_camera.c? > > > Is there another example? > > > > > > What do you mean by videobuf implementation? As I said I just need a > > > contiguous memory. > > > > I mean, whether you're gping to use videobuf-dma-contig.c or > > videobuf-dma-sg.c, respectively, whether you'll be calling > > videobuf_queue_dma_contig_init() or videobuf_queue_sg_init() in your > > driver. > > > > Regards > > Guennadi > > --- > > Guennadi Liakhovetski, Ph.D. > > Freelance Open-Source Software Developer > > http://www.open-technology.de/ > > > > --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: ATMEL camera interface
Well sorry to bother you again but I am looking at the mx1_camera.c file, and I wonder where are implemented the queue and dqueue functions? The atmel IP is using linked list for the buffers, and previously I was managing it in the queue and dqueue functions. I am not sure where I should take care of it now? Regards, Sedji Le 5/3/2010 4:26 PM, Guennadi Liakhovetski a écrit : On Mon, 3 May 2010, Sedji Gaouaou wrote: Well I need contiguous memory, so I guess I will have a look at mx1_camera.c? Is there another example? What do you mean by videobuf implementation? As I said I just need a contiguous memory. I mean, whether you're gping to use videobuf-dma-contig.c or videobuf-dma-sg.c, respectively, whether you'll be calling videobuf_queue_dma_contig_init() or videobuf_queue_sg_init() in your driver. Regards Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: ATMEL camera interface
On Mon, 3 May 2010, Sedji Gaouaou wrote: > Well I need contiguous memory, so I guess I will have a look at mx1_camera.c? > Is there another example? > > What do you mean by videobuf implementation? As I said I just need a > contiguous memory. I mean, whether you're gping to use videobuf-dma-contig.c or videobuf-dma-sg.c, respectively, whether you'll be calling videobuf_queue_dma_contig_init() or videobuf_queue_sg_init() in your driver. Regards Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: ATMEL camera interface
Well I need contiguous memory, so I guess I will have a look at mx1_camera.c? Is there another example? What do you mean by videobuf implementation? As I said I just need a contiguous memory. Le 5/3/2010 4:03 PM, Guennadi Liakhovetski a écrit : On Mon, 3 May 2010, Sedji Gaouaou wrote: Hi, I will try to write a soc driver(it seems easier ;)). Are the mx?_camera.c a good starting point? In principle - yes. But think about one pretty important distinction - what videobuf implementation is your driver going to use? Are you going to support scatter-gather or only contiguous buffers? If SG - the only such example in the mainline is pxa_camera.c. If contiguous - feel free to use any one of the rest. Further, mx3_camera uses the dmaengine API, others don't. Hope, this will simplify your choice a bit;) Thanks Guennadi Regards, Sedji Le 4/29/2010 6:35 PM, Guennadi Liakhovetski a écrit : Hi Sedji On Thu, 29 Apr 2010, Sedji Gaouaou wrote: Hi, I need to re-work my driver so I could commit it to the community. Is there a git tree that I can use? Nice to hear that! As far as soc-camera is concerned, the present APIs are pretty stable. Just use the Linus' git tree, or, if you like, you can use the v4l-dvb git tree at git://linuxtv.org/v4l-dvb.git. In fact, you don't have to use the soc-camera API these days, you can just write a complete v4l2-device driver, using the v4l2-subdev API to interface to video clients (sensors, decoders, etc.) However, you can still write your driver as an soc-camera host driver, which would make your task a bit easier at the cost of some reduced flexibility, it's up to you to decide. Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: ATMEL camera interface
Hi, I will try to write a soc driver(it seems easier ;)). Are the mx?_camera.c a good starting point? Regards, Sedji Le 4/29/2010 6:35 PM, Guennadi Liakhovetski a écrit : Hi Sedji On Thu, 29 Apr 2010, Sedji Gaouaou wrote: Hi, I need to re-work my driver so I could commit it to the community. Is there a git tree that I can use? Nice to hear that! As far as soc-camera is concerned, the present APIs are pretty stable. Just use the Linus' git tree, or, if you like, you can use the v4l-dvb git tree at git://linuxtv.org/v4l-dvb.git. In fact, you don't have to use the soc-camera API these days, you can just write a complete v4l2-device driver, using the v4l2-subdev API to interface to video clients (sensors, decoders, etc.) However, you can still write your driver as an soc-camera host driver, which would make your task a bit easier at the cost of some reduced flexibility, it's up to you to decide. Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: ATMEL camera interface
On Mon, 3 May 2010, Sedji Gaouaou wrote: > Hi, > > I will try to write a soc driver(it seems easier ;)). > > Are the mx?_camera.c a good starting point? In principle - yes. But think about one pretty important distinction - what videobuf implementation is your driver going to use? Are you going to support scatter-gather or only contiguous buffers? If SG - the only such example in the mainline is pxa_camera.c. If contiguous - feel free to use any one of the rest. Further, mx3_camera uses the dmaengine API, others don't. Hope, this will simplify your choice a bit;) Thanks Guennadi > Regards, > Sedji > > Le 4/29/2010 6:35 PM, Guennadi Liakhovetski a écrit : > > Hi Sedji > > > > On Thu, 29 Apr 2010, Sedji Gaouaou wrote: > > > > > Hi, > > > > > > I need to re-work my driver so I could commit it to the community. > > > Is there a git tree that I can use? > > > > Nice to hear that! As far as soc-camera is concerned, the present APIs are > > pretty stable. Just use the Linus' git tree, or, if you like, you can use > > the v4l-dvb git tree at git://linuxtv.org/v4l-dvb.git. In fact, you don't > > have to use the soc-camera API these days, you can just write a complete > > v4l2-device driver, using the v4l2-subdev API to interface to video > > clients (sensors, decoders, etc.) However, you can still write your driver > > as an soc-camera host driver, which would make your task a bit easier at > > the cost of some reduced flexibility, it's up to you to decide. > > > > Thanks > > Guennadi > > --- > > Guennadi Liakhovetski, Ph.D. > > Freelance Open-Source Software Developer > > http://www.open-technology.de/ > > > > --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: ATMEL camera interface
Hi Sedji On Thu, 29 Apr 2010, Sedji Gaouaou wrote: > Hi, > > I need to re-work my driver so I could commit it to the community. > Is there a git tree that I can use? Nice to hear that! As far as soc-camera is concerned, the present APIs are pretty stable. Just use the Linus' git tree, or, if you like, you can use the v4l-dvb git tree at git://linuxtv.org/v4l-dvb.git. In fact, you don't have to use the soc-camera API these days, you can just write a complete v4l2-device driver, using the v4l2-subdev API to interface to video clients (sensors, decoders, etc.) However, you can still write your driver as an soc-camera host driver, which would make your task a bit easier at the cost of some reduced flexibility, it's up to you to decide. Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
