On Fri, 11 Dec 2009, Alan Carvalho de Assis wrote: > Hi Guennadi, > > On 12/8/09, Alan Carvalho de Assis <acassis@xxxxxxxxx> wrote: > > Hi Guennadi, > ... > >>> I am trying to use an OV2640 camera with soc_camera. > >>> > >>> I'm using ov772x driver as base, but it needs too much modification to > >>> work with ov2640. > >> > >> I don't know that sensor specifically, but they can be quite different. > >> > > > > Yes, in fact ov2640 appears quite different compared to ov772x and ov9640. > > > >>> The OV2640 chip remaps all registers when register 0xFF is 1 or when it > >>> is > >>> 0. > >> > >> This is not unusual. There are a few ways to implement this, for example, > >> drivers/media/video/rj54n1cb0c.c uses 16-bit addresses, and decodes them > >> to bank:register pairs in its reg_read() and reg_write() routines. > >> > > > > Ok, I will try to implement it this way, case nobody suggests me a > > better approach. > > > > I got mx27_camera from pengutronix tree and modified it to work with > kernel 2.6.32 (few modifications). Sorry, I cannot help you with an out-of-tree driver, and generally I would expect significant changes when going to 2.6.32. > I added platform data/device on my > board using pcm970-baseboard.c as example. > > In the kernel config I selected: > CONFIG_VIDEO_MX27 > CONFIG_SOC_CAMERA_OV9640 > > > I noticed a strange behavior: the ov9640 driver is called before mx27_camera: > > Linux video capture interface: v2.00 > >>> Probe OK until now, going to ProbeVideo <<< > >>> Probing OV9640 <<< > Parent missing or invalid! > Driver for 1-wire Dallas network protocol. > i.MX SDHC driver > usbcore: registered new interface driver usbhid > usbhid: v2.6:USB HID core driver > oprofile: using timer interrupt. > TCP cubic registered > NET: Registered protocol family 17 > mx27-camera mx27-camera.0: initialising > >>> mx27_camera: IRQ request OK! > >>> mx27_camera: pcdev OK! > >>> mx27_camera: clk_csi OK! > mx27-camera mx27-camera.0: Camera clock frequency: 26600000 > >>> mx27_camera: DMA request OK! > mx27-camera mx27-camera.0: Using EMMA > >>> mx27_camera: probe OK until now! > mx27-camera mx27-camera.0: Non-NULL drvdata on register > >>> mx27_camera: soc_camera_host_register returned 0! > > Then ov9640 returns error because icd->dev.parent doesn't exist. > > Did you already see this issue? 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 majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
