usb: gadget: audio: queue wLength-sized requests

On Audio class, the wLength field of the Setup
packet, contains the data payload size of the
following Data phase. Instead of harcoding values,
use wLength.

This also fixes a bug where Gadget driver had to
receive 3 bytes, but it was queueing a ZLP.

Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/f_audio.c b/drivers/usb/gadget/f_audio.c
index ddeaa45cd886fa056daff623baae1d4f0f0ecdc4..ec7ffcd0d0cd7e9a0a42bb1b859b9f71b5c96212 100644 (file)
--- a/drivers/usb/gadget/f_audio.c
+++ b/drivers/usb/gadget/f_audio.c
@@ -460,7 +460,7 @@ static int audio_set_endpoint_req(struct usb_function *f,
 
        switch (ctrl->bRequest) {
        case UAC_SET_CUR:
-               value = 0;
+               value = len;
                break;
 
        case UAC_SET_MIN:
@@ -499,7 +499,7 @@ static int audio_get_endpoint_req(struct usb_function *f,
        case UAC_GET_MIN:
        case UAC_GET_MAX:
        case UAC_GET_RES:
-               value = 3;
+               value = len;
                break;
        case UAC_GET_MEM:
                break;