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ALSA: hdspm - Provide unique driver id based on card serial 

Before, /proc/asound looked like this:

 2 [Default        ]: HDSPM - RME RayDAT_f1cd85
                      RME RayDAT S/N 0xf1cd85 at 0xf7300000, irq 18

In case of a second HDSPM card, its name would be Default_1. This is
cumbersome, because the order of the cards isn't stable across reboots.

To help userspace tools referring to the correct card, this commit
provides a unique id for each card:

 2 [HDSPMxf1cd85   ]: HDSPM - RME RayDAT_f1cd85
                      RME RayDAT S/N 0xf1cd85 at 0xf7300000, irq 18

In this example, userspace (configuration files) would then use
hw:HDSPMxf1cd85 to choose the right card.

The serial is masked to 24bits, so this string is always shorter than
sixteen chars.

Signed-off-by: Adrian Knoth <adi@drcomp.erfurt.thur.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Adrian Knoth 2012-01-10 20:58:40 +01:00 committed by Takashi Iwai
parent 74eeb141d3
commit f7de8ba3fc
1 changed files with 19 additions and 2 deletions
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21
sound/pci/rme9652/hdspm.c
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@ -6783,6 +6783,25 @@ static int __devinit snd_hdspm_create(struct snd_card *card,
tasklet_init(&hdspm->midi_tasklet,
hdspm_midi_tasklet, (unsigned long) hdspm);
if (hdspm->io_type != MADIface) {
hdspm->serial = (hdspm_read(hdspm,
HDSPM_midiStatusIn0)>>8) & 0xFFFFFF;
/* id contains either a user-provided value or the default
* NULL. If it's the default, we're safe to
* fill card->id with the serial number.
*
* If the serial number is 0xFFFFFF, then we're dealing with
* an old PCI revision that comes without a sane number. In
* this case, we don't set card->id to avoid collisions
* when running with multiple cards.
*/
if (NULL == id[hdspm->dev] && hdspm->serial != 0xFFFFFF) {
sprintf(card->id, "HDSPMx%06x", hdspm->serial);
snd_card_set_id(card, card->id);
}
}
snd_printdd("create alsa devices.\n");
err = snd_hdspm_create_alsa_devices(card, hdspm);
if (err < 0)
@ -6867,8 +6886,6 @@ static int __devinit snd_hdspm_probe(struct pci_dev *pci,
}
if (hdspm->io_type != MADIface) {
hdspm->serial = (hdspm_read(hdspm,
HDSPM_midiStatusIn0)>>8) & 0xFFFFFF;
sprintf(card->shortname, "%s_%x",
hdspm->card_name,
hdspm->serial);