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authorClemens Ladisch <clemens@ladisch.de>2008-09-22 09:04:43 +0200
committerClemens Ladisch <clemens@ladisch.de>2008-09-22 09:04:43 +0200
commit397b1dcc449082ce3f720c548da9c59db01cb739 (patch)
treea5295eabb214f913cd931c50b079c81b8086e577 /sound/pci/oxygen/oxygen_io.c
parentdbbbd6744439d95d2b0dc23c5cdca2c477377f76 (diff)
ALSA: oxygen: add UART I/O functions
Add functions to allow model drivers to communicate with external chips by doing I/O with the not-used-for-MIDI UART. Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Diffstat (limited to 'sound/pci/oxygen/oxygen_io.c')
-rw-r--r--sound/pci/oxygen/oxygen_io.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c
index 83f135f80df4..deba7389aec3 100644
--- a/sound/pci/oxygen/oxygen_io.c
+++ b/sound/pci/oxygen/oxygen_io.c
@@ -20,6 +20,7 @@
#include <linux/delay.h>
#include <linux/sched.h>
#include <sound/core.h>
+#include <sound/mpu401.h>
#include <asm/io.h>
#include "oxygen.h"
@@ -232,3 +233,23 @@ void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data)
device | OXYGEN_2WIRE_DIR_WRITE);
}
EXPORT_SYMBOL(oxygen_write_i2c);
+
+static void _write_uart(struct oxygen *chip, unsigned int port, u8 data)
+{
+ if (oxygen_read8(chip, OXYGEN_MPU401 + 1) & MPU401_TX_FULL)
+ msleep(1);
+ oxygen_write8(chip, OXYGEN_MPU401 + port, data);
+}
+
+void oxygen_reset_uart(struct oxygen *chip)
+{
+ _write_uart(chip, 1, MPU401_RESET);
+ _write_uart(chip, 1, MPU401_ENTER_UART);
+}
+EXPORT_SYMBOL(oxygen_reset_uart);
+
+void oxygen_write_uart(struct oxygen *chip, u8 data)
+{
+ _write_uart(chip, 0, data);
+}
+EXPORT_SYMBOL(oxygen_write_uart);