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HID: Add HID Report Descriptor to sysfs 

Add a new binary sysfs entry called report_descriptor which contains
the HID report descriptor.

Signed-off-by: Alan Ott <alan@signal11.us>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Alan Ott 2011-01-23 22:50:18 -05:00 committed by Jiri Kosina
parent 8ef3953108
commit 6d3bfb7434
2 changed files with 43 additions and 0 deletions
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10
Documentation/ABI/testing/sysfs-driver-hid Normal file
View File

@ -0,0 +1,10 @@
What: For USB devices : /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/report_descriptor
For BT devices : /sys/class/bluetooth/hci<addr>/<hid-bus>:<vendor-id>:<product-id>.<num>/report_descriptor
Symlink : /sys/class/hidraw/hidraw<num>/device/report_descriptor
Date: Jan 2011
KernelVersion: 2.0.39
Contact: Alan Ott <alan@signal11.us>
Description: When read, this file returns the device's raw binary HID
report descriptor.
This file cannot be written.
Users: HIDAPI library (http://www.signal11.us/oss/hidapi)

33
drivers/hid/hid-core.c
View File

@ -1159,6 +1159,32 @@ static bool hid_hiddev(struct hid_device *hdev)
return !!hid_match_id(hdev, hid_hiddev_list);
}
static ssize_t
read_report_descriptor(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
if (off >= hdev->rsize)
return 0;
if (off + count > hdev->rsize)
count = hdev->rsize - off;
memcpy(buf, hdev->rdesc + off, count);
return count;
}
static struct bin_attribute dev_bin_attr_report_desc = {
.attr = { .name = "report_descriptor", .mode = 0444 },
.read = read_report_descriptor,
.size = HID_MAX_DESCRIPTOR_SIZE,
};
int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
{
static const char *types[] = { "Device", "Pointer", "Mouse", "Device",
@ -1169,6 +1195,7 @@ 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 +1257,11 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
bus = "<UNKNOWN>";
}
ret = device_create_bin_file(&hdev->dev, &dev_bin_attr_report_desc);
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);
@ -1240,6 +1272,7 @@ EXPORT_SYMBOL_GPL(hid_connect);
void hid_disconnect(struct hid_device *hdev)
{
device_remove_bin_file(&hdev->dev, &dev_bin_attr_report_desc);
if (hdev->claimed & HID_CLAIMED_INPUT)
hidinput_disconnect(hdev);
if (hdev->claimed & HID_CLAIMED_HIDDEV)