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authorAdrian Knoth <adi@drcomp.erfurt.thur.de>2012-01-10 20:58:40 +0100
committerTakashi Iwai <tiwai@suse.de>2012-01-11 08:55:58 +0100
commitf7de8ba3fcf19487d2f0af9aee0c510fc79efa15 (patch)
tree422003d6891ef94c6a2c57de625f3dbc8f24c97c /sound
parent74eeb141d3bdf5a9a65c84dd637c41f12c40f41c (diff)
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/rme9652/hdspm.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 16092538e0bb..cc9f6c83d661 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -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);