USB: gadget: android: Integrate f_midi USB MIDI gadget driver

[firefly-linux-kernel-4.4.55.git] / drivers / usb / gadget / android.c

diff --git a/drivers/usb/gadget/android.c b/drivers/usb/gadget/android.c
index 83b1240d9b19f8112b7070daeca505eb53c2e7a4..61c5e582bf473d447db995b7b271750cb0248265 100644 (file)
--- a/drivers/usb/gadget/android.c
+++ b/drivers/usb/gadget/android.c
@@ -32,6 +32,7 @@
 
 #include "f_fs.c"
 #include "f_audio_source.c"
+#include "f_midi.c"
 #include "f_mass_storage.c"
 #include "f_mtp.c"
 #include "f_accessory.c"
@@ -51,6 +52,12 @@ static const char longname[] = "Gadget Android";
 #define VENDOR_ID              0x18D1
 #define PRODUCT_ID             0x0001
 
+/* f_midi configuration */
+#define MIDI_INPUT_PORTS    1
+#define MIDI_OUTPUT_PORTS   1
+#define MIDI_BUFFER_SIZE    256
+#define MIDI_QUEUE_LENGTH   32
+
 struct android_usb_function {
        char *name;
        void *config;
@@ -933,6 +940,60 @@ static struct android_usb_function audio_source_function = {
        .attributes     = audio_source_function_attributes,
 };
 
+static int midi_function_init(struct android_usb_function *f,
+                                       struct usb_composite_dev *cdev)
+{
+       struct midi_alsa_config *config;
+
+       config = kzalloc(sizeof(struct midi_alsa_config), GFP_KERNEL);
+       f->config = config;
+       if (!config)
+               return -ENOMEM;
+       config->card = -1;
+       config->device = -1;
+       return 0;
+}
+
+static void midi_function_cleanup(struct android_usb_function *f)
+{
+       kfree(f->config);
+}
+
+static int midi_function_bind_config(struct android_usb_function *f,
+                                               struct usb_configuration *c)
+{
+       struct midi_alsa_config *config = f->config;
+
+       return f_midi_bind_config(c, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+                       MIDI_INPUT_PORTS, MIDI_OUTPUT_PORTS, MIDI_BUFFER_SIZE,
+                       MIDI_QUEUE_LENGTH, config);
+}
+
+static ssize_t midi_alsa_show(struct device *dev,
+               struct device_attribute *attr, char *buf)
+{
+       struct android_usb_function *f = dev_get_drvdata(dev);
+       struct midi_alsa_config *config = f->config;
+
+       /* print ALSA card and device numbers */
+       return sprintf(buf, "%d %d\n", config->card, config->device);
+}
+
+static DEVICE_ATTR(alsa, S_IRUGO, midi_alsa_show, NULL);
+
+static struct device_attribute *midi_function_attributes[] = {
+       &dev_attr_alsa,
+       NULL
+};
+
+static struct android_usb_function midi_function = {
+       .name           = "midi",
+       .init           = midi_function_init,
+       .cleanup        = midi_function_cleanup,
+       .bind_config    = midi_function_bind_config,
+       .attributes     = midi_function_attributes,
+};
+
 static struct android_usb_function *supported_functions[] = {
        &ffs_function,
        &acm_function,
@@ -942,10 +1003,10 @@ static struct android_usb_function *supported_functions[] = {
        &mass_storage_function,
        &accessory_function,
        &audio_source_function,
+       &midi_function,
        NULL
 };
 
-
 static int android_init_functions(struct android_usb_function **functions,
                                  struct usb_composite_dev *cdev)
 {