Hi Jonathan, Now that the work on the AT91 adc driver using software triggers looks well on its way to the kernel, I begin to work on hardware triggers for it. Few questions raise though. First, it seems that when using hardware triggers, we have to use the iio ring buffers. So the first implementation that comes to my mind is this one : - The probe function actually sets up the driver, the triggers, the buffer, etc. - Each time an interrupt is raised, the handler either fill the buffer with the values of the activated channels or store it in a temporary variable just like I'm doing right now for the software triggers. - When a user reads the sysfs file, either read from the buffer or from the temporary variable. But : - Is it the right way to do so with iio ? - Is there a way for the user to select at runtime if he wants only software trigger or hardware trigger (if they are enabled in the kernel) ? - What is the role of this pollfunc defined in the iio_dev struct ? Also, the ADC has 4 external trigger sources, which are selected through a register. 3 of them are muxed pins, so the pins available varies from one board to another. Is there a way for the user at runtime to select the source he wants ? Finally, this ADC supports two resolutions : 8 and 10 bit. For now, only 10 bit resolution is supported, but the user might want to use 8 bit. Is there a way to do so ? Thanks, Maxime -- Maxime Ripard, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
