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[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>
This commit is contained in:
Takashi Iwai 2007-02-22 16:07:21 +01:00 committed by Jaroslav Kysela
parent 76e6306774
commit 8f7ba051d2
4 changed files with 22 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/sound/alsa/ALSA-Configuration.txt
View File

@ -1278,6 +1278,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
port - port number or -1 (disable)
irq - IRQ number or -1 (disable)
pnp - PnP detection - 0 = disable, 1 = enable (default)
uart_enter - Issue UART_ENTER command at open - bool, default = on
This module supports multiple devices and PnP.

1
include/sound/mpu401.h
View File

@ -50,6 +50,7 @@
#define MPU401_INFO_INTEGRATED (1 << 2) /* integrated h/w port */
#define MPU401_INFO_MMIO (1 << 3) /* MMIO access */
#define MPU401_INFO_TX_IRQ (1 << 4) /* independent TX irq */
#define MPU401_INFO_UART_ONLY (1 << 5) /* No ENTER_UART cmd needed */
#define MPU401_MODE_BIT_INPUT 0
#define MPU401_MODE_BIT_OUTPUT 1

12
sound/drivers/mpu401/mpu401.c
View File

@ -42,6 +42,7 @@ static int pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
#endif
static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* MPU-401 port number */
static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* MPU-401 IRQ */
static int uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for MPU-401 device.");
@ -57,6 +58,8 @@ module_param_array(port, long, NULL, 0444);
MODULE_PARM_DESC(port, "Port # for MPU-401 device.");
module_param_array(irq, int, NULL, 0444);
MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device.");
module_param_array(uart_enter, bool, NULL, 0444);
MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open.");
static struct platform_device *platform_devices[SNDRV_CARDS];
static int pnp_registered;
@ -80,10 +83,11 @@ static int snd_mpu401_create(int dev, struct snd_card **rcard)
strcat(card->longname, "polled");
}
if ((err = snd_mpu401_uart_new(card, 0,
MPU401_HW_MPU401,
port[dev], 0,
irq[dev], irq[dev] >= 0 ? IRQF_DISABLED : 0, NULL)) < 0) {
err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev],
uart_enter[dev] ? 0 : MPU401_INFO_UART_ONLY,
irq[dev], irq[dev] >= 0 ? IRQF_DISABLED : 0,
NULL);
if (err < 0) {
printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]);
goto _err;
}

18
sound/drivers/mpu401/mpu401_uart.c
View File

@ -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;