[ALSA] Test volume resolution of usb audio at initialization

Test the volume of usb audio whether actually it works and adjusts
the resolution value according to it.

Some USB audio devices report a lower resolution than it reacts.
The only possible check is to write and read a volume value.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 8d08b34a1cb569946d20fbaf2bdc2d6dac27afb1..ce86283ee0fa6ded6c992aa24af05980e8a3f627 100644 (file)
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -306,8 +306,8 @@ static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
                cval->res = 1;
        if (val < cval->min)
                return 0;
-       else if (val > cval->max)
-               return (cval->max - cval->min) / cval->res;
+       else if (val >= cval->max)
+               return (cval->max - cval->min + cval->res - 1) / cval->res;
        else
                return (val - cval->min) / cval->res;
 }
@@ -670,6 +670,36 @@ static int get_min_max(struct usb_mixer_elem_info *cval, int default_min)
                }
                if (cval->res == 0)
                        cval->res = 1;
+
+               /* Additional checks for the proper resolution
+                *
+                * Some devices report smaller resolutions than actually
+                * reacting.  They don't return errors but simply clip
+                * to the lower aligned value.
+                */
+               if (cval->min + cval->res < cval->max) {
+                       int last_valid_res = cval->res;
+                       int saved, test, check;
+                       get_cur_mix_value(cval, minchn, &saved);
+                       for (;;) {
+                               test = saved;
+                               if (test < cval->max)
+                                       test += cval->res;
+                               else
+                                       test -= cval->res;
+                               if (test < cval->min || test > cval->max ||
+                                   set_cur_mix_value(cval, minchn, test) ||
+                                   get_cur_mix_value(cval, minchn, &check)) {
+                                       cval->res = last_valid_res;
+                                       break;
+                               }
+                               if (test == check)
+                                       break;
+                               cval->res *= 2;
+                       }
+                       set_cur_mix_value(cval, minchn, saved);
+               }
+
                cval->initialized = 1;
        }
        return 0;
@@ -695,7 +725,8 @@ static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_
                if (! cval->initialized)
                        get_min_max(cval,  0);
                uinfo->value.integer.min = 0;
-               uinfo->value.integer.max = (cval->max - cval->min) / cval->res;
+               uinfo->value.integer.max =
+                       (cval->max - cval->min + cval->res - 1) / cval->res;
        }
        return 0;
 }