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path: root/drivers/hid/hid-core.c
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Diffstat (limited to 'drivers/hid/hid-core.c')
-rw-r--r--drivers/hid/hid-core.c53
1 files changed, 39 insertions, 14 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 860e21ec6a49..92387fc0bf18 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -30,6 +30,7 @@
#include <linux/vmalloc.h>
#include <linux/sched.h>
#include <linux/semaphore.h>
+#include <linux/async.h>
#include <linux/hid.h>
#include <linux/hiddev.h>
@@ -218,13 +219,14 @@ static unsigned hid_lookup_collection(struct hid_parser *parser, unsigned type)
* Add a usage to the temporary parser table.
*/
-static int hid_add_usage(struct hid_parser *parser, unsigned usage)
+static int hid_add_usage(struct hid_parser *parser, unsigned usage, u8 size)
{
if (parser->local.usage_index >= HID_MAX_USAGES) {
hid_err(parser->device, "usage index exceeded\n");
return -1;
}
parser->local.usage[parser->local.usage_index] = usage;
+ parser->local.usage_size[parser->local.usage_index] = size;
parser->local.collection_index[parser->local.usage_index] =
parser->collection_stack_ptr ?
parser->collection_stack[parser->collection_stack_ptr - 1] : 0;
@@ -486,10 +488,7 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item)
return 0;
}
- if (item->size <= 2)
- data = (parser->global.usage_page << 16) + data;
-
- return hid_add_usage(parser, data);
+ return hid_add_usage(parser, data, item->size);
case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM:
@@ -498,9 +497,6 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item)
return 0;
}
- if (item->size <= 2)
- data = (parser->global.usage_page << 16) + data;
-
parser->local.usage_minimum = data;
return 0;
@@ -511,9 +507,6 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item)
return 0;
}
- if (item->size <= 2)
- data = (parser->global.usage_page << 16) + data;
-
count = data - parser->local.usage_minimum;
if (count + parser->local.usage_index >= HID_MAX_USAGES) {
/*
@@ -533,7 +526,7 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item)
}
for (n = parser->local.usage_minimum; n <= data; n++)
- if (hid_add_usage(parser, n)) {
+ if (hid_add_usage(parser, n, item->size)) {
dbg_hid("hid_add_usage failed\n");
return -1;
}
@@ -548,6 +541,22 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item)
}
/*
+ * Concatenate Usage Pages into Usages where relevant:
+ * As per specification, 6.2.2.8: "When the parser encounters a main item it
+ * concatenates the last declared Usage Page with a Usage to form a complete
+ * usage value."
+ */
+
+static void hid_concatenate_usage_page(struct hid_parser *parser)
+{
+ int i;
+
+ for (i = 0; i < parser->local.usage_index; i++)
+ if (parser->local.usage_size[i] <= 2)
+ parser->local.usage[i] += parser->global.usage_page << 16;
+}
+
+/*
* Process a main item.
*/
@@ -556,6 +565,8 @@ static int hid_parser_main(struct hid_parser *parser, struct hid_item *item)
__u32 data;
int ret;
+ hid_concatenate_usage_page(parser);
+
data = item_udata(item);
switch (item->tag) {
@@ -765,6 +776,8 @@ static int hid_scan_main(struct hid_parser *parser, struct hid_item *item)
__u32 data;
int i;
+ hid_concatenate_usage_page(parser);
+
data = item_udata(item);
switch (item->tag) {
@@ -1624,7 +1637,7 @@ static struct hid_report *hid_get_report(struct hid_report_enum *report_enum,
* Implement a generic .request() callback, using .raw_request()
* DO NOT USE in hid drivers directly, but through hid_hw_request instead.
*/
-void __hid_request(struct hid_device *hid, struct hid_report *report,
+int __hid_request(struct hid_device *hid, struct hid_report *report,
int reqtype)
{
char *buf;
@@ -1633,7 +1646,7 @@ void __hid_request(struct hid_device *hid, struct hid_report *report,
buf = hid_alloc_report_buf(report, GFP_KERNEL);
if (!buf)
- return;
+ return -ENOMEM;
len = hid_report_len(report);
@@ -1650,8 +1663,11 @@ void __hid_request(struct hid_device *hid, struct hid_report *report,
if (reqtype == HID_REQ_GET_REPORT)
hid_input_report(hid, report->type, buf, ret, 0);
+ ret = 0;
+
out:
kfree(buf);
+ return ret;
}
EXPORT_SYMBOL_GPL(__hid_request);
@@ -2349,6 +2365,15 @@ int hid_add_device(struct hid_device *hdev)
dev_set_name(&hdev->dev, "%04X:%04X:%04X.%04X", hdev->bus,
hdev->vendor, hdev->product, atomic_inc_return(&id));
+ /*
+ * Try loading the module for the device before the add, so that we do
+ * not first have hid-generic binding only to have it replaced
+ * immediately afterwards with a specialized driver.
+ */
+ if (!current_is_async())
+ request_module("hid:b%04Xg%04Xv%08Xp%08X", hdev->bus,
+ hdev->group, hdev->vendor, hdev->product);
+
hid_debug_register(hdev, dev_name(&hdev->dev));
ret = device_add(&hdev->dev);
if (!ret)