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path: root/drivers/hid/usbhid/hid-core.c
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Diffstat (limited to 'drivers/hid/usbhid/hid-core.c')
-rw-r--r--drivers/hid/usbhid/hid-core.c81
1 files changed, 55 insertions, 26 deletions
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 340d6ae646ed..482f936fc29b 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -28,6 +28,7 @@
#include <linux/input.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
+#include <linux/string.h>
#include <linux/usb.h>
@@ -86,8 +87,13 @@ static int hid_start_in(struct hid_device *hid)
!test_bit(HID_REPORTED_IDLE, &usbhid->iofl) &&
!test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
- if (rc != 0)
+ if (rc != 0) {
clear_bit(HID_IN_RUNNING, &usbhid->iofl);
+ if (rc == -ENOSPC)
+ set_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
+ } else {
+ clear_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
+ }
}
spin_unlock_irqrestore(&usbhid->lock, flags);
return rc;
@@ -173,8 +179,10 @@ static void hid_io_error(struct hid_device *hid)
if (time_after(jiffies, usbhid->stop_retry)) {
- /* Retries failed, so do a port reset */
- if (!test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
+ /* Retries failed, so do a port reset unless we lack bandwidth*/
+ if (test_bit(HID_NO_BANDWIDTH, &usbhid->iofl)
+ && !test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
+
schedule_work(&usbhid->reset_work);
goto done;
}
@@ -749,7 +757,7 @@ static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
int usbhid_open(struct hid_device *hid)
{
struct usbhid_device *usbhid = hid->driver_data;
- int res;
+ int res = 0;
mutex_lock(&hid_open_mut);
if (!hid->open++) {
@@ -757,17 +765,27 @@ int usbhid_open(struct hid_device *hid)
/* the device must be awake to reliably request remote wakeup */
if (res < 0) {
hid->open--;
- mutex_unlock(&hid_open_mut);
- return -EIO;
+ res = -EIO;
+ goto done;
}
usbhid->intf->needs_remote_wakeup = 1;
- if (hid_start_in(hid))
- hid_io_error(hid);
-
+ res = hid_start_in(hid);
+ if (res) {
+ if (res != -ENOSPC) {
+ hid_io_error(hid);
+ res = 0;
+ } else {
+ /* no use opening if resources are insufficient */
+ hid->open--;
+ res = -EBUSY;
+ usbhid->intf->needs_remote_wakeup = 0;
+ }
+ }
usb_autopm_put_interface(usbhid->intf);
}
+done:
mutex_unlock(&hid_open_mut);
- return 0;
+ return res;
}
void usbhid_close(struct hid_device *hid)
@@ -1396,7 +1414,34 @@ static int hid_post_reset(struct usb_interface *intf)
struct usb_device *dev = interface_to_usbdev (intf);
struct hid_device *hid = usb_get_intfdata(intf);
struct usbhid_device *usbhid = hid->driver_data;
+ struct usb_host_interface *interface = intf->cur_altsetting;
int status;
+ char *rdesc;
+
+ /* Fetch and examine the HID report descriptor. If this
+ * has changed, then rebind. Since usbcore's check of the
+ * configuration descriptors passed, we already know that
+ * the size of the HID report descriptor has not changed.
+ */
+ rdesc = kmalloc(hid->rsize, GFP_KERNEL);
+ if (!rdesc) {
+ dbg_hid("couldn't allocate rdesc memory (post_reset)\n");
+ return 1;
+ }
+ status = hid_get_class_descriptor(dev,
+ interface->desc.bInterfaceNumber,
+ HID_DT_REPORT, rdesc, hid->rsize);
+ if (status < 0) {
+ dbg_hid("reading report descriptor failed (post_reset)\n");
+ kfree(rdesc);
+ return 1;
+ }
+ status = memcmp(rdesc, hid->rdesc, hid->rsize);
+ kfree(rdesc);
+ if (status != 0) {
+ dbg_hid("report descriptor changed\n");
+ return 1;
+ }
spin_lock_irq(&usbhid->lock);
clear_bit(HID_RESET_PENDING, &usbhid->iofl);
@@ -1553,28 +1598,15 @@ static struct usb_driver hid_driver = {
.supports_autosuspend = 1,
};
-static const struct hid_device_id hid_usb_table[] = {
- { HID_USB_DEVICE(HID_ANY_ID, HID_ANY_ID) },
- { }
-};
-
struct usb_interface *usbhid_find_interface(int minor)
{
return usb_find_interface(&hid_driver, minor);
}
-static struct hid_driver hid_usb_driver = {
- .name = "generic-usb",
- .id_table = hid_usb_table,
-};
-
static int __init hid_init(void)
{
int retval = -ENOMEM;
- retval = hid_register_driver(&hid_usb_driver);
- if (retval)
- goto hid_register_fail;
retval = usbhid_quirks_init(quirks_param);
if (retval)
goto usbhid_quirks_init_fail;
@@ -1587,8 +1619,6 @@ static int __init hid_init(void)
usb_register_fail:
usbhid_quirks_exit();
usbhid_quirks_init_fail:
- hid_unregister_driver(&hid_usb_driver);
-hid_register_fail:
return retval;
}
@@ -1596,7 +1626,6 @@ static void __exit hid_exit(void)
{
usb_deregister(&hid_driver);
usbhid_quirks_exit();
- hid_unregister_driver(&hid_usb_driver);
}
module_init(hid_init);