ALSA: Add support for key reporting via the jack interface

[pandora-kernel.git] / sound / core / jack.c

diff --git a/sound/core/jack.c b/sound/core/jack.c
index f6f091f..3813e7b 100644 (file)
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -55,7 +55,7 @@ static int snd_jack_dev_register(struct snd_device *device)
 {
        struct snd_jack *jack = device->device_data;
        struct snd_card *card = device->card;
-       int err;
+       int err, i;
 
        snprintf(jack->name, sizeof(jack->name), "%s %s",
                 card->shortname, jack->id);
@@ -65,6 +65,19 @@ static int snd_jack_dev_register(struct snd_device *device)
        if (!jack->input_dev->dev.parent)
                jack->input_dev->dev.parent = snd_card_get_device_link(card);
 
+       /* Add capabilities for any keys that are enabled */
+       for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
+               int testbit = SND_JACK_BTN_0 >> i;
+
+               if (!(jack->type & testbit))
+                       continue;
+
+               if (!jack->key[i])
+                       jack->key[i] = BTN_0 + i;
+
+               input_set_capability(jack->input_dev, EV_KEY, jack->key[i]);
+       }
+
        err = input_register_device(jack->input_dev);
        if (err == 0)
                jack->registered = 1;
@@ -150,6 +163,43 @@ void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
 }
 EXPORT_SYMBOL(snd_jack_set_parent);
 
+/**
+ * snd_jack_set_key - Set a key mapping on a jack
+ *
+ * @jack:    The jack to configure
+ * @type:    Jack report type for this key
+ * @keytype: Input layer key type to be reported
+ *
+ * Map a SND_JACK_BTN_ button type to an input layer key, allowing
+ * reporting of keys on accessories via the jack abstraction.  If no
+ * mapping is provided but keys are enabled in the jack type then
+ * BTN_n numeric buttons will be reported.
+ *
+ * Note that this is intended to be use by simple devices with small
+ * numbers of keys that can be reported.  It is also possible to
+ * access the input device directly - devices with complex input
+ * capabilities on accessories should consider doing this rather than
+ * using this abstraction.
+ *
+ * This function may only be called prior to registration of the jack.
+ */
+int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
+                    int keytype)
+{
+       int key = fls(SND_JACK_BTN_0) - fls(type);
+
+       WARN_ON(jack->registered);
+
+       if (!keytype || key >= ARRAY_SIZE(jack->key))
+               return -EINVAL;
+
+       jack->type |= type;
+       jack->key[key] = keytype;
+
+       return 0;
+}
+EXPORT_SYMBOL(snd_jack_set_key);
+
 /**
  * snd_jack_report - Report the current status of a jack
  *
@@ -163,6 +213,14 @@ void snd_jack_report(struct snd_jack *jack, int status)
        if (!jack)
                return;
 
+       for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
+               int testbit = SND_JACK_BTN_0 >> i;
+
+               if (jack->type & testbit)
+                       input_report_key(jack->input_dev, jack->key[i],
+                                        status & testbit);
+       }
+
        for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
                int testbit = 1 << i;
                if (jack->type & testbit)