After commit 7e4da3fcf7c9 ("usb: gadget: composite:
Test get_alt() presence instead of set_alt()") f_uac1
function became broken because it doesn't have
get_alt() callback implementation and composite
framework never set altsetting 1 for audiostreaming
interface. On host site it looks like:
[424339.017711] 21:1:1: usb_set_interface failed (-32)
Since host can't set altsetting 1, it can't start
playing audio.
In order to fix it implemented get_alt along with
minor improvements (error conditions checking)
similar to what existing f_uac2 has.
Cc: Krzysztof Opasiak <[email protected]>
Signed-off-by: Ruslan Bilovol <[email protected]>
---
drivers/usb/gadget/function/f_uac1.c | 40 +++++++++++++++++++++++++++++++++++-
1 file changed, 39 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/function/f_uac1.c
index f2ac0cb..5dfc94b 100644
--- a/drivers/usb/gadget/function/f_uac1.c
+++ b/drivers/usb/gadget/function/f_uac1.c
@@ -277,6 +277,9 @@ static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
struct f_audio {
struct gaudio card;
+ u8 ac_intf, ac_alt;
+ u8 as_intf, as_alt;
+
/* endpoints handle full and/or high speeds */
struct usb_ep *out_ep;
@@ -586,7 +589,20 @@ static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
req_count = opts->req_count;
audio_buf_size = opts->audio_buf_size;
- if (intf == 1) {
+ /* No i/f has more than 2 alt settings */
+ if (alt > 1) {
+ ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__);
+ return -EINVAL;
+ }
+
+ if (intf == audio->ac_intf) {
+ /* Control I/f has only 1 AltSetting - 0 */
+ if (alt) {
+ ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__);
+ return -EINVAL;
+ }
+ return 0;
+ } else if (intf == audio->as_intf) {
if (alt == 1) {
err = config_ep_by_speed(cdev->gadget, f, out_ep);
if (err)
@@ -631,11 +647,28 @@ static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
schedule_work(&audio->playback_work);
}
}
+ audio->as_alt = alt;
}
return err;
}
+static int f_audio_get_alt(struct usb_function *f, unsigned intf)
+{
+ struct f_audio *audio = func_to_audio(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+
+ if (intf == audio->ac_intf)
+ return audio->ac_alt;
+ else if (intf == audio->as_intf)
+ return audio->as_alt;
+ else
+ ERROR(cdev, "%s:%d Invalid Interface %d!\n",
+ __func__, __LINE__, intf);
+
+ return -EINVAL;
+}
+
static void f_audio_disable(struct usb_function *f)
{
return;
@@ -702,12 +735,16 @@ static void f_audio_build_desc(struct f_audio *audio)
if (status < 0)
goto fail;
ac_interface_desc.bInterfaceNumber = status;
+ audio->ac_intf = status;
+ audio->ac_alt = 0;
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
as_interface_alt_0_desc.bInterfaceNumber = status;
as_interface_alt_1_desc.bInterfaceNumber = status;
+ audio->as_intf = status;
+ audio->as_alt = 0;
status = -ENODEV;
@@ -966,6 +1003,7 @@ static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
audio->card.func.bind = f_audio_bind;
audio->card.func.unbind = f_audio_unbind;
audio->card.func.set_alt = f_audio_set_alt;
+ audio->card.func.get_alt = f_audio_get_alt;
audio->card.func.setup = f_audio_setup;
audio->card.func.disable = f_audio_disable;
audio->card.func.free_func = f_audio_free;
--
1.9.1