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authorHenrik Rydberg <rydberg@euromail.se>2012-04-22 14:21:40 +0200
committerJiri Kosina <jkosina@suse.cz>2012-05-01 12:54:53 +0200
commita7197c2e4120ce40e7e3f5580336b9a1dc791220 (patch)
tree1f508022a41558ea29dc87baddcf8c2132f9bdd3 /include/linux/hid.h
parent2a039bf5a6caa6b41c3839c1e3a19b20fb38270b (diff)
downloadop-kernel-dev-a7197c2e4120ce40e7e3f5580336b9a1dc791220.zip
op-kernel-dev-a7197c2e4120ce40e7e3f5580336b9a1dc791220.tar.gz
HID: Handle driver-specific device descriptor in core
The low-level driver can read the report descriptor, but it cannot determine driver-specific changes to it. The hid core can fixup and parse the report descriptor during driver attach, but does not have direct access to the descriptor when doing so. To be able to handle attach/detach of hid drivers properly, a semantic change to hid_parse_report() is needed. This function has been used in two ways, both as descriptor reader in the ll drivers and as a parsor in the probe of the drivers. This patch splits the usage by introducing hid_open_report(), and modifies the hid_parse() macro to call hid_open_report() instead. The only usage of hid_parse_report() is then to read and store the device descriptor. As a consequence, we can handle the report fixups automatically inside the hid core. Signed-off-by: Henrik Rydberg <rydberg@euromail.se> Tested-by: Nikolai Kondrashov <spbnick@gmail.com> Tested-by: Benjamin Tissoires <benjamin.tissoires@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'include/linux/hid.h')
-rw-r--r--include/linux/hid.h14
1 files changed, 4 insertions, 10 deletions
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 3a95da6..d8e7cc7 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -467,6 +467,8 @@ struct hid_driver;
struct hid_ll_driver;
struct hid_device { /* device report descriptor */
+ __u8 *dev_rdesc;
+ unsigned dev_rsize;
__u8 *rdesc;
unsigned rsize;
struct hid_collection *collection; /* List of HID collections */
@@ -735,6 +737,7 @@ void hid_output_report(struct hid_report *report, __u8 *data);
struct hid_device *hid_allocate_device(void);
struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id);
int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size);
+int hid_open_report(struct hid_device *device);
int hid_check_keys_pressed(struct hid_device *hid);
int hid_connect(struct hid_device *hid, unsigned int connect_mask);
void hid_disconnect(struct hid_device *hid);
@@ -805,16 +808,7 @@ static inline void hid_map_usage_clear(struct hid_input *hidinput,
*/
static inline int __must_check hid_parse(struct hid_device *hdev)
{
- int ret;
-
- if (hdev->status & HID_STAT_PARSED)
- return 0;
-
- ret = hdev->ll_driver->parse(hdev);
- if (!ret)
- hdev->status |= HID_STAT_PARSED;
-
- return ret;
+ return hid_open_report(hdev);
}
/**
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