[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: Hans de Goede <hdegoede@redhat.com> CC: Ondrej Zary <linux@rainbow-software.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -37,6 +37,10 @@
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struct snd_tea575x;
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struct snd_tea575x_ops {
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/* Drivers using snd_tea575x must either define read_ and write_val */
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void (*write_val)(struct snd_tea575x *tea, u32 val);
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u32 (*read_val)(struct snd_tea575x *tea);
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/* Or define the 3 pin functions */
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void (*set_pins)(struct snd_tea575x *tea, u8 pins);
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u8 (*get_pins)(struct snd_tea575x *tea);
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void (*set_direction)(struct snd_tea575x *tea, bool output);
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@ -71,6 +71,9 @@ static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val)
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u16 l;
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u8 data;
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if (tea->ops->write_val)
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return tea->ops->write_val(tea, val);
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tea->ops->set_direction(tea, 1);
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udelay(16);
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@ -94,6 +97,9 @@ static u32 snd_tea575x_read(struct snd_tea575x *tea)
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u16 l, rdata;
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u32 data = 0;
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if (tea->ops->read_val)
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return tea->ops->read_val(tea);
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tea->ops->set_direction(tea, 0);
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tea->ops->set_pins(tea, 0);
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udelay(16);
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