On Tue, 2010-06-01 at 10:14 +0200, Sedji Gaouaou wrote: > Hi, > > > > > > 1. Something first should call v4l2_device_register() on a v4l2_device > > object. (Typically there is only one v4l2_device object per "bridge" > > chip between the PCI, PCIe, or USB bus and the subdevices, even if that > > bridge chip has more than one I2C master implementation.) > > > > 2. Then, for subdevices connected to the bridge chip via I2C, something > > needs to call v4l2_i2c_new_subdev() with the v4l2_device pointer as one > > of the arguments, to get back a v4l2_subdevice instance pointer. > > > > 3. After that, v4l2_subdev_call() with the v4l2_subdev pointer as one of > > the arguments can be used to invoke the subdevice methods. > > > > TV Video capture drivers do this work themselves. Drivers using a > > camera framework may have the framework doing some of the work for them. > > > > > > Regards, > > Andy > > > > > > > > > Is there a sensor driver which is using this method? > > To write the ov2640 driver I have just copied the ov7670.c file, and I > didn't find the v4l2_i2c_new_subdev in it... Subdev driver modules, like ov7670.c, don't attach themselves; the bridge chip driver attaches an instance to an I2C bus. Look at drivers/media/video/cafe_ccic.c And examine cafe_pci_probe() and the definition and use of the sensor_call() macro. Also note $ grep -Ril ov7670 drivers/media/video/* will show you in what drivers, the ov7670 might be used. Regards, Andy > Regards, > Sedji -- 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
