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| author | Alan Ott <alan@signal11.us> | 2011-01-23 22:50:18 -0500 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2011-02-17 13:23:14 +0100 |
| commit | 6d3bfb74341c2c1454fcf5ec9c4dd707011f78e5 (patch) | |
| tree | a39633616655a75caeb15eb8a69c8609b7c0469c /drivers/hid/hid-core.c | |
| parent | 8ef395310852710bb4237d918bbac53b22622ef0 (diff) | |
| download | lwn-6d3bfb74341c2c1454fcf5ec9c4dd707011f78e5.tar.gz lwn-6d3bfb74341c2c1454fcf5ec9c4dd707011f78e5.zip | |
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>
Diffstat (limited to 'drivers/hid/hid-core.c')
| -rw-r--r-- | drivers/hid/hid-core.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 2dcdf9ff02ea..5e0e4eea7065 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) |