On Fri, 16 Nov 2018 17:50:24 +0100, David Ulricht wrote: > > The stuff in sound/i2c/* are mostly for the i2c bus on a PCI sound > cards, an implementation independent from the standard i2c stuff. > > And, in your case, it's hard to know how the i2c bus is connected. > If it's controlled over HD-audio GPIO pin (one for clk and one for > data), then some stuff in sound/i2c can be re-used. Or, if it's on > another i2c bus, the story will be completely different... > > I have the schematics of the CS8409. the i2c is connected to the GPIO of the > HDA. > > MAX98374 has a Reset Low pin which is connected to GPIO 5 on the HDA > controller CS8409. This must > be driven high, then wait for 1.5 ms. Only then will the amps be out of > device shutdown. > GPIO6 is 8409_I2C_SCL > GPIO7 is 8409_I2C_SDA > > GPIO5 is AUD_SPKRAMP_RESET_L > > Knowing GPIO6 is the clock and GPIO7 is the data, how can I use them? > Can I use hda-verb /dev/snd/hwC0D0 0x01 XXX YYY ? what XXX YYY would be ? You need to set GPIO mask, direction then data. 0x01 SET_GPIO_MASK 0xXX 0x01 SET_GPIO_DIR 0xXX 0x01 SET_GPIO_DATA 0xXX The value to be pass is the bits. GPIO0=0x01, GPIO1=0x02, GPIO3=0x04, ... You can read the data after setting mask and dir by 0x01 GET_GPIO_DATA. Pass 0 for the value, and you'll get a byte value as a read result. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
