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path: root/drivers/usb/core/quirks.c
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Diffstat (limited to 'drivers/usb/core/quirks.c')
-rw-r--r--drivers/usb/core/quirks.c186
1 files changed, 181 insertions, 5 deletions
diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index 54b019e267c5..920f48a49a87 100644
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -6,11 +6,157 @@
* Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
*/
+#include <linux/moduleparam.h>
#include <linux/usb.h>
#include <linux/usb/quirks.h>
#include <linux/usb/hcd.h>
#include "usb.h"
+struct quirk_entry {
+ u16 vid;
+ u16 pid;
+ u32 flags;
+};
+
+static DEFINE_MUTEX(quirk_mutex);
+
+static struct quirk_entry *quirk_list;
+static unsigned int quirk_count;
+
+static char quirks_param[128];
+
+static int quirks_param_set(const char *val, const struct kernel_param *kp)
+{
+ char *p, *field;
+ u16 vid, pid;
+ u32 flags;
+ size_t i;
+ int err;
+
+ err = param_set_copystring(val, kp);
+ if (err)
+ return err;
+
+ mutex_lock(&quirk_mutex);
+
+ if (!*val) {
+ quirk_count = 0;
+ kfree(quirk_list);
+ quirk_list = NULL;
+ goto unlock;
+ }
+
+ for (quirk_count = 1, i = 0; val[i]; i++)
+ if (val[i] == ',')
+ quirk_count++;
+
+ if (quirk_list) {
+ kfree(quirk_list);
+ quirk_list = NULL;
+ }
+
+ quirk_list = kcalloc(quirk_count, sizeof(struct quirk_entry),
+ GFP_KERNEL);
+ if (!quirk_list) {
+ mutex_unlock(&quirk_mutex);
+ return -ENOMEM;
+ }
+
+ for (i = 0, p = (char *)val; p && *p;) {
+ /* Each entry consists of VID:PID:flags */
+ field = strsep(&p, ":");
+ if (!field)
+ break;
+
+ if (kstrtou16(field, 16, &vid))
+ break;
+
+ field = strsep(&p, ":");
+ if (!field)
+ break;
+
+ if (kstrtou16(field, 16, &pid))
+ break;
+
+ field = strsep(&p, ",");
+ if (!field || !*field)
+ break;
+
+ /* Collect the flags */
+ for (flags = 0; *field; field++) {
+ switch (*field) {
+ case 'a':
+ flags |= USB_QUIRK_STRING_FETCH_255;
+ break;
+ case 'b':
+ flags |= USB_QUIRK_RESET_RESUME;
+ break;
+ case 'c':
+ flags |= USB_QUIRK_NO_SET_INTF;
+ break;
+ case 'd':
+ flags |= USB_QUIRK_CONFIG_INTF_STRINGS;
+ break;
+ case 'e':
+ flags |= USB_QUIRK_RESET;
+ break;
+ case 'f':
+ flags |= USB_QUIRK_HONOR_BNUMINTERFACES;
+ break;
+ case 'g':
+ flags |= USB_QUIRK_DELAY_INIT;
+ break;
+ case 'h':
+ flags |= USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL;
+ break;
+ case 'i':
+ flags |= USB_QUIRK_DEVICE_QUALIFIER;
+ break;
+ case 'j':
+ flags |= USB_QUIRK_IGNORE_REMOTE_WAKEUP;
+ break;
+ case 'k':
+ flags |= USB_QUIRK_NO_LPM;
+ break;
+ case 'l':
+ flags |= USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL;
+ break;
+ case 'm':
+ flags |= USB_QUIRK_DISCONNECT_SUSPEND;
+ break;
+ case 'n':
+ flags |= USB_QUIRK_DELAY_CTRL_MSG;
+ break;
+ /* Ignore unrecognized flag characters */
+ }
+ }
+
+ quirk_list[i++] = (struct quirk_entry)
+ { .vid = vid, .pid = pid, .flags = flags };
+ }
+
+ if (i < quirk_count)
+ quirk_count = i;
+
+unlock:
+ mutex_unlock(&quirk_mutex);
+
+ return 0;
+}
+
+static const struct kernel_param_ops quirks_param_ops = {
+ .set = quirks_param_set,
+ .get = param_get_string,
+};
+
+static struct kparam_string quirks_param_string = {
+ .maxlen = sizeof(quirks_param),
+ .string = quirks_param,
+};
+
+module_param_cb(quirks, &quirks_param_ops, &quirks_param_string, 0644);
+MODULE_PARM_DESC(quirks, "Add/modify USB quirks by specifying quirks=vendorID:productID:quirks");
+
/* Lists of quirky USB devices, split in device quirks and interface quirks.
* Device quirks are applied at the very beginning of the enumeration process,
* right after reading the device descriptor. They can thus only match on device
@@ -321,8 +467,8 @@ static int usb_amd_resume_quirk(struct usb_device *udev)
return 0;
}
-static u32 __usb_detect_quirks(struct usb_device *udev,
- const struct usb_device_id *id)
+static u32 usb_detect_static_quirks(struct usb_device *udev,
+ const struct usb_device_id *id)
{
u32 quirks = 0;
@@ -340,21 +486,43 @@ static u32 __usb_detect_quirks(struct usb_device *udev,
return quirks;
}
+static u32 usb_detect_dynamic_quirks(struct usb_device *udev)
+{
+ u16 vid = le16_to_cpu(udev->descriptor.idVendor);
+ u16 pid = le16_to_cpu(udev->descriptor.idProduct);
+ int i, flags = 0;
+
+ mutex_lock(&quirk_mutex);
+
+ for (i = 0; i < quirk_count; i++) {
+ if (vid == quirk_list[i].vid && pid == quirk_list[i].pid) {
+ flags = quirk_list[i].flags;
+ break;
+ }
+ }
+
+ mutex_unlock(&quirk_mutex);
+
+ return flags;
+}
+
/*
* Detect any quirks the device has, and do any housekeeping for it if needed.
*/
void usb_detect_quirks(struct usb_device *udev)
{
- udev->quirks = __usb_detect_quirks(udev, usb_quirk_list);
+ udev->quirks = usb_detect_static_quirks(udev, usb_quirk_list);
/*
* Pixart-based mice would trigger remote wakeup issue on AMD
* Yangtze chipset, so set them as RESET_RESUME flag.
*/
if (usb_amd_resume_quirk(udev))
- udev->quirks |= __usb_detect_quirks(udev,
+ udev->quirks |= usb_detect_static_quirks(udev,
usb_amd_resume_quirk_list);
+ udev->quirks ^= usb_detect_dynamic_quirks(udev);
+
if (udev->quirks)
dev_dbg(&udev->dev, "USB quirks for this device: %x\n",
udev->quirks);
@@ -373,7 +541,7 @@ void usb_detect_interface_quirks(struct usb_device *udev)
{
u32 quirks;
- quirks = __usb_detect_quirks(udev, usb_interface_quirk_list);
+ quirks = usb_detect_static_quirks(udev, usb_interface_quirk_list);
if (quirks == 0)
return;
@@ -381,3 +549,11 @@ void usb_detect_interface_quirks(struct usb_device *udev)
quirks);
udev->quirks |= quirks;
}
+
+void usb_release_quirk_list(void)
+{
+ mutex_lock(&quirk_mutex);
+ kfree(quirk_list);
+ quirk_list = NULL;
+ mutex_unlock(&quirk_mutex);
+}