Add a new sysfs entry called report_descriptor which contains the HID report
descriptor.
Signed-off-by: Alan Ott <alan@xxxxxxxxxxx>
---
drivers/hid/hid-core.c | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index d678cf3..0ff1ba2 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1159,6 +1159,28 @@ static bool hid_hiddev(struct hid_device *hdev)
return !!hid_match_id(hdev, hid_hiddev_list);
}
+
+static ssize_t show_report_descriptor(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int i, cur = 0;
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+
+ for (i = 0; i < hdev->rsize; i++) {
+ if (cur + 4 >= PAGE_SIZE)
+ break;
+ sprintf(buf + cur, "%02hhx ", hdev->rdesc[i]);
+ cur += 3;
+ }
+ /* Replace the last space with a newline. */
+ buf[cur-1] = '\n';
+ buf[PAGE_SIZE-1] = '\0';
+ return cur + 1;
+}
+
+static DEVICE_ATTR(report_descriptor, S_IRUGO, show_report_descriptor, NULL);
+
int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
{
static const char *types[] = { "Device", "Pointer", "Mouse", "Device",
@@ -1169,6 +1191,7 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
char buf[64];
unsigned int i;
int len;
+ int ret;
if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE)
connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV);
@@ -1230,6 +1253,11 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
bus = "<UNKNOWN>";
}
+ ret = device_create_file(&hdev->dev, &dev_attr_report_descriptor);
+ if (ret)
+ hid_warn(hdev,
+ "can't create sysfs report descriptor attribute err: %d\n", ret);
+
hid_info(hdev, "%s: %s HID v%x.%02x %s [%s] on %s\n",
buf, bus, hdev->version >> 8, hdev->version & 0xff,
type, hdev->name, hdev->phys);
--
1.7.0.4
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