usb: rename usb_drv_recv() to usb_recv_recv_nonblocking()

IMHO the current name is somewhat misleading:

- usb_drv_send() is blocking and we have usb_drv_send_nonblocking()
  for the non-blocking case. This inconsistent naming can only
  promote confusion. (And what would we call a blocking receive?)

- Other hardware abstraction APIs in Rockbox are usually blocking:
  storage, LCD, backlight, audio... in other words, blocking is the
  default expected behavior, with non-blocking calls being a rarity.

Change-Id: I05b41088d09eab582697674f4f06fdca0c8950af

firmware/target/arm/as3525/usb-drv-as3525.c

@@ -412,12 +412,12 @@ void usb_drv_cancel_all_transfers(void)
     restore_irq(flags);
 }
 
-int usb_drv_recv(int ep, void *ptr, int len)
+int usb_drv_recv_nonblocking(int ep, void *ptr, int len)
 {
     struct usb_dev_dma_desc *uc_desc = endpoints[ep][1].uc_desc;
 
     ep &= 0x7f;
-    logf("usb_drv_recv(%d,%x,%d)\n", ep, (int)ptr, len);
+    logf("usb_drv_recv_nonblocking(%d,%x,%d)\n", ep, (int)ptr, len);
 
     if (len > USB_DMA_DESC_RXTX_BYTES)
         panicf("usb_recv: len=%d > %d", len, USB_DMA_DESC_RXTX_BYTES);
@@ -674,7 +674,8 @@ static void handle_out_ep(int ep)
  * The usb_storage buffer is 63KB, but Linux sends 120KB.
  * We get the first part, but upon re-enabling receive dma we
  * get a 'buffer not available' error from the hardware, since
- * we haven't gotten the next usb_drv_recv() from the stack yet.
+ * we haven't gotten the next usb_drv_recv_nonblocking() from
+ * the stack yet.
  * It seems the NAK bit is ignored here and the HW tries to dma
  * the incoming data anyway.
  * In theory I think the BNA error should be recoverable, but

firmware/target/arm/rk27xx/usb-drv-rk27xx.c

@@ -355,7 +355,7 @@ int usb_drv_send_nonblocking(int endpoint, void *ptr, int length)
 }
 
 /* Setup a receive transfer. (non blocking) */
-int usb_drv_recv(int endpoint, void* ptr, int length)
+int usb_drv_recv_nonblocking(int endpoint, void* ptr, int length)
 {
     logf("udc: recv(%x)", endpoint);
     struct endpoint_t *ep;

firmware/target/arm/tms320dm320/sansa-connect/tnetv105_usb_drv.c

@@ -1026,8 +1026,8 @@ static bool tnetv_handle_cppi(void)
     if (rx_intstatus || tx_intstatus || rcv_sched)
     {
         /* Request calling again after short delay
-         * Needed when for example when OUT endpoint has pending
-         * data but the USB task did not call usb_drv_recv() yet.
+         * Needed when for example when OUT endpoint has pending data
+         * but the USB task did not call usb_drv_recv_nonblocking() yet.
          */
         return true;
     }
@@ -1371,7 +1371,7 @@ int usb_drv_send_nonblocking(int endpoint, void* ptr, int length)
     return _usb_drv_send(endpoint, ptr, length, false);
 }
 
-int usb_drv_recv(int endpoint, void* ptr, int length)
+int usb_drv_recv_nonblocking(int endpoint, void* ptr, int length)
 {
     int epn = EP_NUM(endpoint);
     struct ep_runtime_t *ep;
@@ -1388,8 +1388,6 @@ int usb_drv_recv(int endpoint, void* ptr, int length)
     return 0;
 }
 
-void usb_drv_ack(struct usb_ctrlrequest* req);
-
 void usb_drv_set_address(int address)
 {
     UsbCtrlType usbCtrl;

firmware/target/arm/usb-drv-arc.c

@@ -593,7 +593,7 @@ int usb_drv_send(int endpoint, void* ptr, int length)
     return prime_transfer(EP_NUM(endpoint), ptr, length, true, true);
 }
 
-int usb_drv_recv(int endpoint, void* ptr, int length)
+int usb_drv_recv_nonblocking(int endpoint, void* ptr, int length)
 {
     //logf("usbrecv(%x, %d)", ptr, length);
     return prime_transfer(EP_NUM(endpoint), ptr, length, false, false);

firmware/target/arm/usb-s3c6400x.c

@@ -166,7 +166,7 @@ int usb_drv_send_nonblocking(int endpoint, void *ptr, int length)
     return 0;
 }
 
-int usb_drv_recv(int endpoint, void* ptr, int length)
+int usb_drv_recv_nonblocking(int endpoint, void* ptr, int length)
 {
     ep_transfer(EP_NUM(endpoint), ptr, length, true);
     return 0;

firmware/target/arm/usb-tcc.c

@@ -609,7 +609,7 @@ int usb_drv_send_nonblocking(int endpoint, void *ptr, int length)
     return rc;
 }
 
-int usb_drv_recv(int endpoint, void* ptr, int length)
+int usb_drv_recv_nonblocking(int endpoint, void* ptr, int length)
 {
     volatile struct tcc_ep *tcc_ep = &tcc_endpoints[endpoint & 0x7f];
     int flags;