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authorRoman Volkov <v1ron@mail.ru>2014-01-24 16:18:03 +0400
committerClemens Ladisch <clemens@ladisch.de>2014-01-29 23:45:44 +0400
commit303cff30d36e6a450c3ced1e3bed034038d87a86 (patch)
treed7dfa1fe1c0a0a1ac98ddc953620ff35c6b92598
parent10dd44dc88419ba5278435669ac9e35f9f410c7e (diff)
downloadlinux-303cff30d36e6a450c3ced1e3bed034038d87a86.tar.xz
ALSA: oxygen: modify the SPI writing function
Modify the oxygen_write_spi() function to use the newly introduced oxygen_wait_spi() function. Change return value from void to int, so it can return error codes. Older drivers just ignore that return value, new drivers can check this value. We need to wait AFTER initiating the SPI transaction, otherwise read operation will not work. Signed-off-by: Roman Volkov <v1ron@mail.ru> Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
-rw-r--r--sound/pci/oxygen/oxygen.h2
-rw-r--r--sound/pci/oxygen/oxygen_io.c17
2 files changed, 7 insertions, 12 deletions
diff --git a/sound/pci/oxygen/oxygen.h b/sound/pci/oxygen/oxygen.h
index 09a24b24958b..c10ab077afd8 100644
--- a/sound/pci/oxygen/oxygen.h
+++ b/sound/pci/oxygen/oxygen.h
@@ -198,7 +198,7 @@ void oxygen_write_ac97(struct oxygen *chip, unsigned int codec,
void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec,
unsigned int index, u16 data, u16 mask);
-void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data);
+int oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data);
void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data);
void oxygen_reset_uart(struct oxygen *chip);
diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c
index 4b88c7a332e4..3274907189fe 100644
--- a/sound/pci/oxygen/oxygen_io.c
+++ b/sound/pci/oxygen/oxygen_io.c
@@ -212,23 +212,18 @@ static int oxygen_wait_spi(struct oxygen *chip)
return -EIO;
}
-void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)
+int oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)
{
- unsigned int count;
-
- /* should not need more than 30.72 us (24 * 1.28 us) */
- count = 10;
- while ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) & OXYGEN_SPI_BUSY)
- && count > 0) {
- udelay(4);
- --count;
- }
-
+ /*
+ * We need to wait AFTER initiating the SPI transaction,
+ * otherwise read operations will not work.
+ */
oxygen_write8(chip, OXYGEN_SPI_DATA1, data);
oxygen_write8(chip, OXYGEN_SPI_DATA2, data >> 8);
if (control & OXYGEN_SPI_DATA_LENGTH_3)
oxygen_write8(chip, OXYGEN_SPI_DATA3, data >> 16);
oxygen_write8(chip, OXYGEN_SPI_CONTROL, control);
+ return oxygen_wait_spi(chip);
}
EXPORT_SYMBOL(oxygen_write_spi);