diff options
| author | Takashi Iwai <tiwai@suse.de> | 2007-02-22 16:07:21 +0100 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2007-05-11 16:55:43 +0200 |
| commit | 8f7ba051d2abb3d3bde9b95e47246c60b704d2b4 (patch) | |
| tree | 6b1fcd728b520ca24c99672c873ed17b43ac3b9f /sound/drivers/mpu401/mpu401_uart.c | |
| parent | 76e630677419ecf2cf8c0b738536eee34dc048e6 (diff) | |
[ALSA] mpu401 - Add MPU401_INFO_UART_ONLY bitflag
Added MPU401_INFO_UART_ONLY bitflag to avoid issueing UART_ENTER command
at opening streams. Some devices support only UART mode and give errors
to UART_ENTER.
A new module option, uart_enter, is added to snd-mpu401 driver.
For UART-only devices, set uart_enter=0.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound/drivers/mpu401/mpu401_uart.c')
| -rw-r--r-- | sound/drivers/mpu401/mpu401_uart.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/sound/drivers/mpu401/mpu401_uart.c b/sound/drivers/mpu401/mpu401_uart.c index 3daa9fa56c0..85aedc348e2 100644 --- a/sound/drivers/mpu401/mpu401_uart.c +++ b/sound/drivers/mpu401/mpu401_uart.c @@ -266,6 +266,16 @@ static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd, return 0; } +static int snd_mpu401_do_reset(struct snd_mpu401 *mpu) +{ + if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1)) + return -EIO; + if (!(mpu->info_flags & MPU401_INFO_UART_ONLY) && + snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1)) + return -EIO; + return 0; +} + /* * input/output open/close - protected by open_mutex in rawmidi.c */ @@ -278,9 +288,7 @@ static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream) if (mpu->open_input && (err = mpu->open_input(mpu)) < 0) return err; if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) { - if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1)) - goto error_out; - if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1)) + if (snd_mpu401_do_reset(mpu) < 0) goto error_out; } mpu->substream_input = substream; @@ -302,9 +310,7 @@ static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream) if (mpu->open_output && (err = mpu->open_output(mpu)) < 0) return err; if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) { - if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1)) - goto error_out; - if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1)) + if (snd_mpu401_do_reset(mpu) < 0) goto error_out; } mpu->substream_output = substream; |