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>

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);