Commit 31a62d41 authored by Hans de Goede's avatar Hans de Goede Committed by Mauro Carvalho Chehab

[media] snd_tea575x: Add write_/read_val operations

Some devices which use the tea575x tuner chip don't allow bit banging the
lines, instead they offer a method to directly set / get the contents of the
25 bit shift-register in the chip. Notably the Griffin radioSHARK USB radio
receiver does this.
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
CC: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 9bc31633
......@@ -37,6 +37,10 @@
struct snd_tea575x;
struct snd_tea575x_ops {
/* Drivers using snd_tea575x must either define read_ and write_val */
void (*write_val)(struct snd_tea575x *tea, u32 val);
u32 (*read_val)(struct snd_tea575x *tea);
/* Or define the 3 pin functions */
void (*set_pins)(struct snd_tea575x *tea, u8 pins);
u8 (*get_pins)(struct snd_tea575x *tea);
void (*set_direction)(struct snd_tea575x *tea, bool output);
......
......@@ -71,6 +71,9 @@ static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val)
u16 l;
u8 data;
if (tea->ops->write_val)
return tea->ops->write_val(tea, val);
tea->ops->set_direction(tea, 1);
udelay(16);
......@@ -94,6 +97,9 @@ static u32 snd_tea575x_read(struct snd_tea575x *tea)
u16 l, rdata;
u32 data = 0;
if (tea->ops->read_val)
return tea->ops->read_val(tea);
tea->ops->set_direction(tea, 0);
tea->ops->set_pins(tea, 0);
udelay(16);
......
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