Em Tue, 26 Jan 2016 15:10:00 +0100 Arnd Bergmann <arnd@xxxxxxxx> escreveu: > em28xx selects VIDEO_TUNER, which has a dependency on MEDIA_TUNER, > so we get a Kconfig warning if that is disabled: > > warning: (VIDEO_PVRUSB2 && VIDEO_USBVISION && VIDEO_GO7007 && VIDEO_AU0828_V4L2 && VIDEO_CX231XX && VIDEO_TM6000 && VIDEO_EM28XX && VIDEO_IVTV && VIDEO_MXB && VIDEO_CX18 && VIDEO_CX23885 && VIDEO_CX88 && VIDEO_BT848 && VIDEO_SAA7134 && VIDEO_SAA7164) selects VIDEO_TUNER which has unmet direct dependencies (MEDIA_SUPPORT && MEDIA_TUNER) This warning is bogus, as it is OK to select VIDEO_TUNER even if MEDIA_TUNER is not defined. See how MEDIA_TUNER is defined: config MEDIA_TUNER tristate depends on (MEDIA_ANALOG_TV_SUPPORT || MEDIA_DIGITAL_TV_SUPPORT || MEDIA_RADIO_SUPPORT || MEDIA_SDR_SUPPORT) && I2C default y select MEDIA_TUNER_XC2028 if MEDIA_SUBDRV_AUTOSELECT select MEDIA_TUNER_XC5000 if MEDIA_SUBDRV_AUTOSELECT select MEDIA_TUNER_XC4000 if MEDIA_SUBDRV_AUTOSELECT select MEDIA_TUNER_MT20XX if MEDIA_SUBDRV_AUTOSELECT select MEDIA_TUNER_TDA8290 if MEDIA_SUBDRV_AUTOSELECT select MEDIA_TUNER_TEA5761 if MEDIA_SUBDRV_AUTOSELECT && MEDIA_RADIO_SUPPORT select MEDIA_TUNER_TEA5767 if MEDIA_SUBDRV_AUTOSELECT && MEDIA_RADIO_SUPPORT select MEDIA_TUNER_SIMPLE if MEDIA_SUBDRV_AUTOSELECT select MEDIA_TUNER_TDA9887 if MEDIA_SUBDRV_AUTOSELECT select MEDIA_TUNER_MC44S803 if MEDIA_SUBDRV_AUTOSELECT MEDIA_TUNER is just one of the media Kconfig workarounds to its limitation of not allowing to select a device that has dependencies. It is true if the user selected either TV or radio media devices. It works together with MEDIA_SUBDRV_AUTOSELECT. When both are enabled, it selects all media tuners. That makes easier for end users to not need to worry about manually selecting the needed tuners. Advanced users may, instead, manually select the media tuner that his hardware needs. In such case, it doesn't matter if MEDIA_TUNER is enabled or not. As this is due to a Kconfig limitation, I've no idea how to fix or get hid of it, but making em28xx dependent of MEDIA_TUNER is wrong. Also, as this is a Kconfig hidden option, making em28xx dependent of MEDIA_TUNER would actually disable it, if no other media driver is compiled. The problem here is that the em28xx driver is used by several different types of devices: - pure webcam devices. Those devices don't have a tuner; - stream capture devices. Those devices don't have a tuner; - analog TV devices. For analog TV to work, MEDIA_TUNER is needed. Still, most of those devices have Composite and S-VIDEO ports. It is possible to use the driver for stream capture on those ports even if MEDIA_TUNER is not compiled; - digital TV devices. Those require either a tuner or a DVB frontend. - any combination of the above. Regards, Mauro > > This adds a dependency on MEDIA_TUNER to avoid the warning. > > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> > --- > drivers/media/usb/em28xx/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/media/usb/em28xx/Kconfig b/drivers/media/usb/em28xx/Kconfig > index 75323f5efd0f..cacc757e2254 100644 > --- a/drivers/media/usb/em28xx/Kconfig > +++ b/drivers/media/usb/em28xx/Kconfig > @@ -1,6 +1,6 @@ > config VIDEO_EM28XX > tristate "Empia EM28xx USB devices support" > - depends on VIDEO_DEV && I2C > + depends on VIDEO_DEV && I2C && MEDIA_TUNER > select VIDEO_TUNER > select VIDEO_TVEEPROM > -- 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
