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usb: raw-gadget: support stalling/halting/wedging endpoints 

Raw Gadget is currently unable to stall/halt/wedge gadget endpoints,
which is required for proper emulation of certain USB classes.

This patch adds a few more ioctls:

- USB_RAW_IOCTL_EP0_STALL allows to stall control endpoint #0 when
  there's a pending setup request for it.
- USB_RAW_IOCTL_SET/CLEAR_HALT/WEDGE allow to set/clear halt/wedge status
  on non-control non-isochronous endpoints.

Fixes: f2c2e71764 ("usb: gadget: add raw-gadget interface")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Andrey Konovalov 2020-05-07 19:06:57 +02:00 committed by Felipe Balbi
parent 97df5e5758
commit c61769bd47
3 changed files with 144 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/usb/raw-gadget.rst
View File

@ -52,8 +52,6 @@ The typical usage of Raw Gadget looks like:
Potential future improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Implement ioctl's for setting/clearing halt status on endpoints.
- Reporting more events (suspend, resume, etc.) through
USB_RAW_IOCTL_EVENT_FETCH.

131
drivers/usb/gadget/legacy/raw_gadget.c
View File

@ -204,7 +204,7 @@ static void dev_free(struct kref *kref)
}
raw_event_queue_destroy(&dev->queue);
for (i = 0; i < dev->eps_num; i++) {
if (dev->eps[i].state != STATE_EP_ENABLED)
if (dev->eps[i].state == STATE_EP_DISABLED)
continue;
usb_ep_disable(dev->eps[i].ep);
usb_ep_free_request(dev->eps[i].ep, dev->eps[i].req);
@ -704,6 +704,50 @@ static int raw_ioctl_ep0_read(struct raw_dev *dev, unsigned long value)
return ret;
}
static int raw_ioctl_ep0_stall(struct raw_dev *dev, unsigned long value)
{
int ret = 0;
unsigned long flags;
if (value)
return -EINVAL;
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_RUNNING) {
dev_dbg(dev->dev, "fail, device is not running\n");
ret = -EINVAL;
goto out_unlock;
}
if (!dev->gadget) {
dev_dbg(dev->dev, "fail, gadget is not bound\n");
ret = -EBUSY;
goto out_unlock;
}
if (dev->ep0_urb_queued) {
dev_dbg(&dev->gadget->dev, "fail, urb already queued\n");
ret = -EBUSY;
goto out_unlock;
}
if (!dev->ep0_in_pending && !dev->ep0_out_pending) {
dev_dbg(&dev->gadget->dev, "fail, no request pending\n");
ret = -EBUSY;
goto out_unlock;
}
ret = usb_ep_set_halt(dev->gadget->ep0);
if (ret < 0)
dev_err(&dev->gadget->dev,
"fail, usb_ep_set_halt returned %d\n", ret);
if (dev->ep0_in_pending)
dev->ep0_in_pending = false;
else
dev->ep0_out_pending = false;
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static int raw_ioctl_ep_enable(struct raw_dev *dev, unsigned long value)
{
int ret = 0, i;
@ -798,7 +842,7 @@ static int raw_ioctl_ep_disable(struct raw_dev *dev, unsigned long value)
ret = -EBUSY;
goto out_unlock;
}
if (dev->eps[i].state != STATE_EP_ENABLED) {
if (dev->eps[i].state == STATE_EP_DISABLED) {
dev_dbg(&dev->gadget->dev, "fail, endpoint is not enabled\n");
ret = -EINVAL;
goto out_unlock;
@ -832,6 +876,74 @@ static int raw_ioctl_ep_disable(struct raw_dev *dev, unsigned long value)
return ret;
}
static int raw_ioctl_ep_set_clear_halt_wedge(struct raw_dev *dev,
unsigned long value, bool set, bool halt)
{
int ret = 0, i = value;
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
if (dev->state != STATE_DEV_RUNNING) {
dev_dbg(dev->dev, "fail, device is not running\n");
ret = -EINVAL;
goto out_unlock;
}
if (!dev->gadget) {
dev_dbg(dev->dev, "fail, gadget is not bound\n");
ret = -EBUSY;
goto out_unlock;
}
if (i < 0 || i >= dev->eps_num) {
dev_dbg(dev->dev, "fail, invalid endpoint\n");
ret = -EBUSY;
goto out_unlock;
}
if (dev->eps[i].state == STATE_EP_DISABLED) {
dev_dbg(&dev->gadget->dev, "fail, endpoint is not enabled\n");
ret = -EINVAL;
goto out_unlock;
}
if (dev->eps[i].disabling) {
dev_dbg(&dev->gadget->dev,
"fail, disable is in progress\n");
ret = -EINVAL;
goto out_unlock;
}
if (dev->eps[i].urb_queued) {
dev_dbg(&dev->gadget->dev,
"fail, waiting for urb completion\n");
ret = -EINVAL;
goto out_unlock;
}
if (usb_endpoint_xfer_isoc(dev->eps[i].ep->desc)) {
dev_dbg(&dev->gadget->dev,
"fail, can't halt/wedge ISO endpoint\n");
ret = -EINVAL;
goto out_unlock;
}
if (set && halt) {
ret = usb_ep_set_halt(dev->eps[i].ep);
if (ret < 0)
dev_err(&dev->gadget->dev,
"fail, usb_ep_set_halt returned %d\n", ret);
} else if (!set && halt) {
ret = usb_ep_clear_halt(dev->eps[i].ep);
if (ret < 0)
dev_err(&dev->gadget->dev,
"fail, usb_ep_clear_halt returned %d\n", ret);
} else if (set && !halt) {
ret = usb_ep_set_wedge(dev->eps[i].ep);
if (ret < 0)
dev_err(&dev->gadget->dev,
"fail, usb_ep_set_wedge returned %d\n", ret);
}
out_unlock:
spin_unlock_irqrestore(&dev->lock, flags);
return ret;
}
static void gadget_ep_complete(struct usb_ep *ep, struct usb_request *req)
{
struct raw_ep *r_ep = (struct raw_ep *)ep->driver_data;
@ -1128,6 +1240,21 @@ static long raw_ioctl(struct file *fd, unsigned int cmd, unsigned long value)
case USB_RAW_IOCTL_EPS_INFO:
ret = raw_ioctl_eps_info(dev, value);
break;
case USB_RAW_IOCTL_EP0_STALL:
ret = raw_ioctl_ep0_stall(dev, value);
break;
case USB_RAW_IOCTL_EP_SET_HALT:
ret = raw_ioctl_ep_set_clear_halt_wedge(
dev, value, true, true);
break;
case USB_RAW_IOCTL_EP_CLEAR_HALT:
ret = raw_ioctl_ep_set_clear_halt_wedge(
dev, value, false, true);
break;
case USB_RAW_IOCTL_EP_SET_WEDGE:
ret = raw_ioctl_ep_set_clear_halt_wedge(
dev, value, true, false);
break;
default:
ret = -EINVAL;
}

15
include/uapi/linux/usb/raw_gadget.h
View File

@ -231,4 +231,19 @@ struct usb_raw_eps_info {
*/
#define USB_RAW_IOCTL_EPS_INFO _IOR('U', 11, struct usb_raw_eps_info)
/*
* Stalls a pending control request on endpoint 0.
* Returns 0 on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_EP0_STALL _IO('U', 12)
/*
* Sets or clears halt or wedge status of the endpoint.
* Accepts endpoint handle as an argument.
* Returns 0 on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_EP_SET_HALT _IOW('U', 13, __u32)
#define USB_RAW_IOCTL_EP_CLEAR_HALT _IOW('U', 14, __u32)
#define USB_RAW_IOCTL_EP_SET_WEDGE _IOW('U', 15, __u32)
#endif /* _UAPI__LINUX_USB_RAW_GADGET_H */