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>
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Documentation/ABI/testing/sysfs-driver-hid
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10
Documentation/ABI/testing/sysfs-driver-hid
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What: For USB devices : /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/report_descriptor
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For BT devices : /sys/class/bluetooth/hci<addr>/<hid-bus>:<vendor-id>:<product-id>.<num>/report_descriptor
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Symlink : /sys/class/hidraw/hidraw<num>/device/report_descriptor
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Date: Jan 2011
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KernelVersion: 2.0.39
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Contact: Alan Ott <alan@signal11.us>
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Description: When read, this file returns the device's raw binary HID
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report descriptor.
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This file cannot be written.
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Users: HIDAPI library (http://www.signal11.us/oss/hidapi)
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@ -1159,6 +1159,32 @@ static bool hid_hiddev(struct hid_device *hdev)
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return !!hid_match_id(hdev, hid_hiddev_list);
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return !!hid_match_id(hdev, hid_hiddev_list);
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}
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}
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static ssize_t
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read_report_descriptor(struct file *filp, struct kobject *kobj,
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struct bin_attribute *attr,
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char *buf, loff_t off, size_t count)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct hid_device *hdev = container_of(dev, struct hid_device, dev);
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if (off >= hdev->rsize)
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return 0;
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if (off + count > hdev->rsize)
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count = hdev->rsize - off;
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memcpy(buf, hdev->rdesc + off, count);
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return count;
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}
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static struct bin_attribute dev_bin_attr_report_desc = {
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.attr = { .name = "report_descriptor", .mode = 0444 },
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.read = read_report_descriptor,
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.size = HID_MAX_DESCRIPTOR_SIZE,
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};
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int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
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int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
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{
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{
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static const char *types[] = { "Device", "Pointer", "Mouse", "Device",
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static const char *types[] = { "Device", "Pointer", "Mouse", "Device",
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@ -1169,6 +1195,7 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
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char buf[64];
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char buf[64];
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unsigned int i;
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unsigned int i;
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int len;
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int len;
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int ret;
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if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE)
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if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE)
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connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV);
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connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV);
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@ -1230,6 +1257,11 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
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bus = "<UNKNOWN>";
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bus = "<UNKNOWN>";
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}
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}
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ret = device_create_bin_file(&hdev->dev, &dev_bin_attr_report_desc);
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if (ret)
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hid_warn(hdev,
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"can't create sysfs report descriptor attribute err: %d\n", ret);
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hid_info(hdev, "%s: %s HID v%x.%02x %s [%s] on %s\n",
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hid_info(hdev, "%s: %s HID v%x.%02x %s [%s] on %s\n",
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buf, bus, hdev->version >> 8, hdev->version & 0xff,
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buf, bus, hdev->version >> 8, hdev->version & 0xff,
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type, hdev->name, hdev->phys);
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type, hdev->name, hdev->phys);
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@ -1240,6 +1272,7 @@ EXPORT_SYMBOL_GPL(hid_connect);
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void hid_disconnect(struct hid_device *hdev)
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void hid_disconnect(struct hid_device *hdev)
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{
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{
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device_remove_bin_file(&hdev->dev, &dev_bin_attr_report_desc);
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if (hdev->claimed & HID_CLAIMED_INPUT)
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if (hdev->claimed & HID_CLAIMED_INPUT)
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hidinput_disconnect(hdev);
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hidinput_disconnect(hdev);
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if (hdev->claimed & HID_CLAIMED_HIDDEV)
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if (hdev->claimed & HID_CLAIMED_HIDDEV)
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