usb: Fix for set/reset endpoints

setting/resetting endpoints is required when switching to alternate
interfaces. This is a common operation for usb audio class.

When audio device is enumerated host invokes set_interface request
to alternate with 0 endpoints associated. That operation lead to
disable never enabled endpoints. With previous solution error message
will appear.

This commit limits error messages to be present only if endpoint
was configured/enabled before and there was a problem when trying
to configure/enable it for the first time.

* Kinetis driver was updated with return error value when ep was
already configured/enabled.

* nxp driver updated with return error value when ep was already
enabled

* sam0 driver updated with return codes instead of magic numbers.

This is fix patch to  #21741

Signed-off-by: Emil Obalski <emil.obalski@nordicsemi.no>

drivers/usb/device/usb_dc_kinetis.c

@@ -341,7 +341,7 @@ int usb_dc_ep_configure(const struct usb_dc_ep_cfg_data * const cfg)
 	if (ep_idx && (dev_data.ep_ctrl[ep_idx].status.in_enabled ||
 	    dev_data.ep_ctrl[ep_idx].status.out_enabled)) {
 		LOG_WRN("endpoint already configured");
-		return -EBUSY;
+		return -EALREADY;
 	}
 
 	LOG_DBG("ep %x, mps %d, type %d", cfg->ep_addr, cfg->ep_mps,
@@ -531,7 +531,7 @@ int usb_dc_ep_enable(const u8_t ep)
 	if (ep_idx && (dev_data.ep_ctrl[ep_idx].status.in_enabled ||
 	    dev_data.ep_ctrl[ep_idx].status.out_enabled)) {
 		LOG_WRN("endpoint 0x%x already enabled", ep);
-		return -EBUSY;
+		return -EALREADY;
 	}
 
 	if (EP_ADDR2DIR(ep) == USB_EP_DIR_OUT) {

drivers/usb/device/usb_dc_mcux_ehci.c

@@ -232,7 +232,7 @@ int usb_dc_ep_enable(const u8_t ep)
 	}
 	if (s_Device.eps[ep_abs_idx].ep_occupied) {
 		LOG_WRN("endpoint 0x%x already enabled", ep);
-		return -EBUSY;
+		return -EALREADY;
 	}
 
 	if ((EP_ADDR2IDX(ep) != USB_CONTROL_ENDPOINT) && (EP_ADDR2DIR(ep) == USB_EP_DIR_OUT)) {

drivers/usb/device/usb_dc_sam0.c

@@ -494,7 +494,7 @@ int usb_dc_ep_enable(const u8_t ep)
 
 	if (ep_num >= USB_NUM_ENDPOINTS) {
 		LOG_ERR("endpoint index/address out of range");
-		return -1;
+		return -EINVAL;
 	}
 
 	if (for_in) {
@@ -519,7 +519,7 @@ int usb_dc_ep_disable(u8_t ep)
 
 	if (ep_num >= USB_NUM_ENDPOINTS) {
 		LOG_ERR("endpoint index/address out of range");
-		return -1;
+		return -EINVAL;
 	}
 
 	endpoint->EPINTENCLR.reg = USB_DEVICE_EPINTENCLR_TRCPT0

subsys/usb/usb_device.c

@@ -467,6 +467,7 @@ static bool usb_get_descriptor(u16_t type_index, u16_t lang_id,
 static bool set_endpoint(const struct usb_ep_descriptor *ep_desc)
 {
 	struct usb_dc_ep_cfg_data ep_cfg;
+	int ret;
 
 	ep_cfg.ep_addr = ep_desc->bEndpointAddress;
 	ep_cfg.ep_mps = sys_le16_to_cpu(ep_desc->wMaxPacketSize);
@@ -480,12 +481,20 @@ static bool set_endpoint(const struct usb_ep_descriptor *ep_desc)
 	LOG_DBG("Set endpoint 0x%x type %u MPS %u",
 		ep_cfg.ep_addr, ep_cfg.ep_type, ep_cfg.ep_mps);
 
-	if (usb_dc_ep_configure(&ep_cfg) < 0) {
+	ret = usb_dc_ep_configure(&ep_cfg);
-		LOG_WRN("Failed to configure endpoint 0x%02x", ep_cfg.ep_addr);
+	if (ret == -EALREADY) {
+		LOG_WRN("Endpoint 0x%02x already configured", ep_cfg.ep_addr);
+	} else if (ret) {
+		LOG_ERR("Failed to configure endpoint 0x%02x", ep_cfg.ep_addr);
+		return false;
 	}
 
-	if (usb_dc_ep_enable(ep_cfg.ep_addr) < 0) {
+	ret = usb_dc_ep_enable(ep_cfg.ep_addr);
-		LOG_WRN("Failed to enable endpoint 0x%02x", ep_cfg.ep_addr);
+	if (ret == -EALREADY) {
+		LOG_WRN("Endpoint 0x%02x already enabled", ep_cfg.ep_addr);
+	} else if (ret) {
+		LOG_ERR("Failed to enable endpoint 0x%02x", ep_cfg.ep_addr);
+		return false;
 	}
 
 	usb_dev.configured = true;
@@ -506,6 +515,7 @@ static bool set_endpoint(const struct usb_ep_descriptor *ep_desc)
 static bool reset_endpoint(const struct usb_ep_descriptor *ep_desc)
 {
 	struct usb_dc_ep_cfg_data ep_cfg;
+	int ret;
 
 	ep_cfg.ep_addr = ep_desc->bEndpointAddress;
 	ep_cfg.ep_type = ep_desc->bmAttributes;
@@ -519,7 +529,10 @@ static bool reset_endpoint(const struct usb_ep_descriptor *ep_desc)
 
 	usb_cancel_transfer(ep_cfg.ep_addr);
 
-	if (usb_dc_ep_disable(ep_cfg.ep_addr) < 0) {
+	ret = usb_dc_ep_disable(ep_cfg.ep_addr);
+	if (ret == -EALREADY) {
+		LOG_WRN("Endpoint 0x%02x already disabled", ep_cfg.ep_addr);
+	} else if (ret) {
 		LOG_ERR("Failed to disable endpoint 0x%02x", ep_cfg.ep_addr);
 		return false;
 	}