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authorJiri Kosina <jkosina@suse.cz>2009-06-12 09:20:55 -0400
committerJiri Kosina <jkosina@suse.cz>2009-06-12 09:20:55 -0400
commita635f9dd83f3382577f4544a96df12356e951a40 (patch)
treec6fa27df6d01c34e304a32c9f423d569f7358346 /include/linux/hid.h
parent8ebf975608aaebd7feb33d77f07ba21a6380e086 (diff)
HID: use debugfs for report dumping descriptor
It is a little bit inconvenient for people who have some non-standard HID hardware (usually violating the HID specification) to have to recompile kernel with CONFIG_HID_DEBUG to be able to see kernel's perspective of the HID report descriptor and observe the parsed events. Plus the messages are then mixed up inconveniently with the rest of the dmesg stuff. This patch implements /sys/kernel/debug/hid/<device>/rdesc file, which represents the kernel's view of report descriptor (both the raw report descriptor data and parsed contents). With all the device-specific debug data being available through debugfs, there is no need for keeping CONFIG_HID_DEBUG, as the 'debug' parameter to the hid module will now only output only driver-specific debugging options, which has absolutely minimal memory footprint, just a few error messages and one global flag (hid_debug). We use the current set of output formatting functions. The ones that need to be used both for one-shot rdesc seq_file and also for continuous flow of data (individual reports, as being sent by the device) distinguish according to the passed seq_file parameter, and if it is NULL, it still output to kernel ringbuffer, otherwise the corresponding seq_file is used for output. The format of the output is preserved. Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'include/linux/hid.h')
-rw-r--r--include/linux/hid.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/hid.h b/include/linux/hid.h
index a72876e43589..da09ab140ef1 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -451,6 +451,10 @@ struct hid_device { /* device report descriptor */
451 char phys[64]; /* Device physical location */ 451 char phys[64]; /* Device physical location */
452 char uniq[64]; /* Device unique identifier (serial #) */ 452 char uniq[64]; /* Device unique identifier (serial #) */
453 453
454 /* debugfs */
455 struct dentry *debug_dir;
456 struct dentry *debug_rdesc;
457
454 void *driver_data; 458 void *driver_data;
455 459
456 /* temporary hid_ff handling (until moved to the drivers) */ 460 /* temporary hid_ff handling (until moved to the drivers) */