At Thu, 12 Feb 2004 12:56:04 +0530,
Gupta, Kshitij wrote:
>
> hi,
>
> I am trying to write an alsa driver for a tsc2101 codec on a arm
> based SOC. The control interface between the SOC and the tsc2101 codec is
> via SPI.
> And the data interface is a I2S interface. Can some one suggest a good
> starting point to start such a driver.
some ALSA drivers use their own i2c functions, although there is a
generic i2c layer on linux kernel. for example, delta.c or ews.c of
ice1712 driver use i2c (SPI) transfer (which calls ak4xxx-adda.c).
but it's rather complex to refer...
the i2c transfer is really easy to implement. do just like the spec
says. a pseudo code is like below.
chip_select_low();
udelay(1);
for (i = 15; i >= 0; i--) {
set_bit_clock(0);
udelay(1);
if (value_to_send & (1 << i))
set_bit_data(1);
else
set_bit_data(0);
udelay(1);
set_bit_clock(0);
udelay(1);
}
chip_select_high();
> does sound/drivers/dummy.c makes sense for such a driver ???
the dummy driver is irrelevant to the BUS type, so it makes some sense
to read the code :)
Takashi
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