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    Subject[PATCH v4 1/1] hid: Add HID Report Descriptor to sysfs.
    Date
    Add a new binary sysfs entry called report_descriptor which contains
    the HID report descriptor.

    Signed-off-by: Alan Ott <alan@signal11.us>
    ---
    Documentation/ABI/testing/sysfs-driver-hid | 10 ++++++++
    drivers/hid/hid-core.c | 33 ++++++++++++++++++++++++++++
    2 files changed, 43 insertions(+), 0 deletions(-)
    create mode 100644 Documentation/ABI/testing/sysfs-driver-hid

    diff --git a/Documentation/ABI/testing/sysfs-driver-hid b/Documentation/ABI/testing/sysfs-driver-hid
    new file mode 100644
    index 0000000..b6490e1
    --- /dev/null
    +++ b/Documentation/ABI/testing/sysfs-driver-hid
    @@ -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)
    diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
    index d678cf3..32bbd5d 100644
    --- a/drivers/hid/hid-core.c
    +++ b/drivers/hid/hid-core.c
    @@ -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)
    --
    1.7.0.4



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