Adapt the dwc3 gadget to use drd library functions.
In prepration to support DRD on dwc3.
Signed-off-by: George Cherian <george.cherian@xxxxxx>
---
drivers/usb/dwc3/gadget.c | 128 ++++++++++++++++++++++++++++++++++++----------
1 file changed, 100 insertions(+), 28 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 2c54d45..a75fae5 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -29,6 +29,7 @@
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
+#include <linux/usb/drd.h>
#include "debug.h"
#include "core.h"
@@ -2681,6 +2682,89 @@ static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
return ret;
}
+void dwc3_gadget_release(struct device *dev)
+{
+ struct usb_gadget *gadget = container_of(dev, struct usb_gadget, dev);
+ struct dwc3_gadget *dwc_gadget = gadget_to_dwc_gadget(gadget);
+ struct dwc3 *dwc = dwc_gadget->dwc;
+
+ dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
+ dwc3_gadget_free_endpoints(dwc);
+ dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
+ dwc->ep0_bounce, dwc->ep0_bounce_addr);
+ kfree(dwc->setup_buf);
+ dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
+ dwc->ep0_trb, dwc->ep0_trb_addr);
+ dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
+ dwc->ctrl_req, dwc->ctrl_req_addr);
+ usb_drd_unregister_udc(dwc->dev);
+ kfree(dwc_gadget);
+}
+
+int dwc3_gadget_setup(void *data)
+{
+ struct dwc3 *dwc = data;
+ struct dwc3_gadget *dwc_gadget;
+ struct usb_drd_gadget *drd_gadget;
+ struct usb_drd_setup *gadget_setup;
+ int ret;
+
+ drd_gadget = kzalloc(sizeof(*drd_gadget), GFP_KERNEL);
+ if (!drd_gadget) {
+ ret = -ENOMEM;
+ goto err1;
+ }
+
+ gadget_setup = kzalloc(sizeof(*gadget_setup), GFP_KERNEL);
+ if (!gadget_setup) {
+ ret = -ENOMEM;
+ goto err2;
+ }
+
+ dwc_gadget = kzalloc(sizeof(*dwc_gadget), GFP_KERNEL);
+ if (!dwc_gadget) {
+ ret = -ENOMEM;
+ goto err3;
+ }
+
+ drd_gadget->g_driver = dwc->gadget_driver;
+
+ /*
+ * Pass the DWC3 specific routines for
+ * switching roles to the drd library
+ */
+ gadget_setup->ll_start = NULL;
+ gadget_setup->ll_stop = NULL;
+ gadget_setup->ll_release = dwc3_gadget_release;
+ gadget_setup->data = (void *)dwc;
+ drd_gadget->gadget_setup = gadget_setup;
+
+ dwc_gadget->gadget.ops = &dwc3_gadget_ops;
+ dwc_gadget->gadget.max_speed = USB_SPEED_SUPER;
+ dwc_gadget->gadget.speed = USB_SPEED_UNKNOWN;
+ dwc_gadget->gadget.sg_supported = true;
+ dwc_gadget->gadget.name = "dwc3-gadget";
+ dwc_gadget->dwc = dwc;
+ drd_gadget->gadget = &dwc_gadget->gadget;
+
+ /*
+ * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
+ * on ep out.
+ */
+ dwc_gadget->gadget.quirk_ep_out_aligned_size = true;
+ dwc->dwc_gadget = dwc_gadget;
+ usb_drd_register_udc(dwc->dev, drd_gadget);
+
+ return 0;
+
+err3:
+ kfree(gadget_setup);
+err2:
+ kfree(drd_gadget);
+err1:
+ return ret;
+}
+
/**
* dwc3_gadget_init - Initializes gadget related registers
* @dwc: pointer to our controller context structure
@@ -2690,7 +2774,6 @@ static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
int dwc3_gadget_init(struct dwc3 *dwc)
{
int ret;
- struct dwc3_gadget *dwc_gadget;
dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
&dwc->ctrl_req_addr, GFP_KERNEL);
@@ -2723,24 +2806,9 @@ int dwc3_gadget_init(struct dwc3 *dwc)
goto err3;
}
- dwc_gadget = kzalloc(sizeof(*dwc_gadget), GFP_KERNEL);
- if (!dwc_gadget) {
- ret = -ENOMEM;
+ ret = dwc3_gadget_setup(dwc);
+ if (ret)
goto err3;
- }
-
- dwc_gadget->gadget.ops = &dwc3_gadget_ops;
- dwc_gadget->gadget.max_speed = USB_SPEED_SUPER;
- dwc_gadget->gadget.speed = USB_SPEED_UNKNOWN;
- dwc_gadget->gadget.sg_supported = true;
- dwc_gadget->gadget.name = "dwc3-gadget";
- dwc_gadget->dwc = dwc;
-
- /*
- * Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
- * on ep out.
- */
- dwc_gadget->gadget.quirk_ep_out_aligned_size = true;
/*
* REVISIT: Here we should clear all pending IRQs to be
@@ -2751,7 +2819,8 @@ int dwc3_gadget_init(struct dwc3 *dwc)
if (ret)
goto err4;
- ret = usb_add_gadget_udc(dwc->dev, &dwc_gadget->gadget);
+ ret = usb_add_gadget_udc_release(dwc->dev, &dwc->dwc_gadget->gadget,
+ dwc3_gadget_release);
if (ret) {
dev_err(dwc->dev, "failed to register udc\n");
goto err4;
@@ -2760,6 +2829,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
return 0;
err4:
+ usb_drd_unregister_udc(dwc->dev);
dwc3_gadget_free_endpoints(dwc);
dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
dwc->ep0_bounce, dwc->ep0_bounce_addr);
@@ -2785,20 +2855,22 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
{
struct dwc3_gadget *dwc_gadget = dwc->dwc_gadget;
- usb_del_gadget_udc(&dwc_gadget->gadget);
+ if (usb_drd_get_state(dwc->dev) & DRD_DEVICE_REGISTERED) {
+ usb_del_gadget_udc(&dwc_gadget->gadget);
- dwc3_gadget_free_endpoints(dwc);
+ dwc3_gadget_free_endpoints(dwc);
- dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
- dwc->ep0_bounce, dwc->ep0_bounce_addr);
+ dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
+ dwc->ep0_bounce, dwc->ep0_bounce_addr);
- kfree(dwc->setup_buf);
+ kfree(dwc->setup_buf);
- dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
- dwc->ep0_trb, dwc->ep0_trb_addr);
+ dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
+ dwc->ep0_trb, dwc->ep0_trb_addr);
- dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
- dwc->ctrl_req, dwc->ctrl_req_addr);
+ dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
+ dwc->ctrl_req, dwc->ctrl_req_addr);
+ }
}
int dwc3_gadget_suspend(struct dwc3 *dwc)
--
1.8.3.1
--
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