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authorJiri Kosina <jkosina@suse.cz>2009-06-12 15:20:55 +0200
committerJiri Kosina <jkosina@suse.cz>2009-06-12 15:20:55 +0200
commita635f9dd83f3382577f4544a96df12356e951a40 (patch)
treec6fa27df6d01c34e304a32c9f423d569f7358346 /include/linux/hid-debug.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-debug.h')
-rw-r--r--include/linux/hid-debug.h32
1 files changed, 19 insertions, 13 deletions
diff --git a/include/linux/hid-debug.h b/include/linux/hid-debug.h
index 50d568ec178a..516e12c33235 100644
--- a/include/linux/hid-debug.h
+++ b/include/linux/hid-debug.h
@@ -2,7 +2,7 @@
#define __HID_DEBUG_H
/*
- * Copyright (c) 2007 Jiri Kosina
+ * Copyright (c) 2007-2009 Jiri Kosina
*/
/*
@@ -22,24 +22,30 @@
*
*/
-#ifdef CONFIG_HID_DEBUG
+#ifdef CONFIG_DEBUG_FS
void hid_dump_input(struct hid_usage *, __s32);
-void hid_dump_device(struct hid_device *);
-void hid_dump_field(struct hid_field *, int);
-void hid_resolv_usage(unsigned);
-void hid_resolv_event(__u8, __u16);
+void hid_dump_device(struct hid_device *, struct seq_file *);
+void hid_dump_field(struct hid_field *, int, struct seq_file *);
+void hid_resolv_usage(unsigned, struct seq_file *);
+void hid_debug_register(struct hid_device *, const char *);
+void hid_debug_unregister(struct hid_device *);
+void hid_debug_init(void);
+void hid_debug_exit(void);
#else
-#define hid_dump_input(a,b) do { } while (0)
-#define hid_dump_device(c) do { } while (0)
-#define hid_dump_field(a,b) do { } while (0)
-#define hid_resolv_usage(a) do { } while (0)
-#define hid_resolv_event(a,b) do { } while (0)
-
-#endif /* CONFIG_HID_DEBUG */
+#define hid_dump_input(a,b) do { } while (0)
+#define hid_dump_device(c) do { } while (0)
+#define hid_dump_field(a,b) do { } while (0)
+#define hid_resolv_usage(a) do { } while (0)
+#define hid_resolv_event(a,b) do { } while (0)
+#define hid_debug_register(a, b) do { } while (0)
+#define hid_debug_unregister(a) do { } while (0)
+#define hid_debug_init() do { } while (0)
+#define hid_debug_exit() do { } while (0)
+#endif
#endif