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authorBenjamin Tissoires <benjamin.tissoires@enac.fr>2012-02-04 17:08:49 +0100
committerJiri Kosina <jkosina@suse.cz>2012-02-06 13:22:39 +0100
commit31ae9bddb935c74b51ead08d54948e5bea0f0344 (patch)
treebb56ab427441efb72af0018a231c858740bc1b81 /drivers/hid
parentc2ef8f21ea8f7c34dfa0b569fdee431348205955 (diff)
downloadop-kernel-dev-31ae9bddb935c74b51ead08d54948e5bea0f0344.zip
op-kernel-dev-31ae9bddb935c74b51ead08d54948e5bea0f0344.tar.gz
HID: multitouch: add control of the feature "Maximum Contact Number"
Some devices, like Perixx Peripad 701 do not work if the feature "Maximum Contact Number" is not set to the right value. This patch allows hid-multitouch to control this feature. If the programmer fills the field maxcontacts in the mt_class, then the driver will set the feature to this value. It is safe for current drivers as the feature is read/write in the HID norm and all devices should implement the norm. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr> Acked-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-multitouch.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 4c69749..d0fa6a7 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -77,6 +77,8 @@ struct mt_device {
unsigned last_slot_field; /* the last field of a slot */
int last_mt_collection; /* last known mt-related collection */
__s8 inputmode; /* InputMode HID feature, -1 if non-existent */
+ __s8 maxcontact_report_id; /* Maximum Contact Number HID feature,
+ -1 if non-existent */
__u8 num_received; /* how many contacts we received */
__u8 num_expected; /* expected last contact index */
__u8 maxcontacts;
@@ -242,6 +244,7 @@ static void mt_feature_mapping(struct hid_device *hdev,
td->inputmode = field->report->id;
break;
case HID_DG_CONTACTMAX:
+ td->maxcontact_report_id = field->report->id;
td->maxcontacts = field->value[0];
if (td->mtclass.maxcontacts)
/* check if the maxcontacts is given by the class */
@@ -606,6 +609,32 @@ static void mt_set_input_mode(struct hid_device *hdev)
}
}
+static void mt_set_maxcontacts(struct hid_device *hdev)
+{
+ struct mt_device *td = hid_get_drvdata(hdev);
+ struct hid_report *r;
+ struct hid_report_enum *re;
+ int fieldmax, max;
+
+ if (td->maxcontact_report_id < 0)
+ return;
+
+ if (!td->mtclass.maxcontacts)
+ return;
+
+ re = &hdev->report_enum[HID_FEATURE_REPORT];
+ r = re->report_id_hash[td->maxcontact_report_id];
+ if (r) {
+ max = td->mtclass.maxcontacts;
+ fieldmax = r->field[0]->logical_maximum;
+ max = min(fieldmax, max);
+ if (r->field[0]->value[0] != max) {
+ r->field[0]->value[0] = max;
+ usbhid_submit_report(hdev, r, USB_DIR_OUT);
+ }
+ }
+}
+
static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret, i;
@@ -631,6 +660,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
}
td->mtclass = *mtclass;
td->inputmode = -1;
+ td->maxcontact_report_id = -1;
td->last_mt_collection = -1;
hid_set_drvdata(hdev, td);
@@ -653,6 +683,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
+ mt_set_maxcontacts(hdev);
mt_set_input_mode(hdev);
return 0;
@@ -665,6 +696,7 @@ fail:
#ifdef CONFIG_PM
static int mt_reset_resume(struct hid_device *hdev)
{
+ mt_set_maxcontacts(hdev);
mt_set_input_mode(hdev);
return 0;
}
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