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HID: multitouch: create sysfs attribute to control quirks from user-space

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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2011-11-23 10:54:28 +01:00 committed by Jiri Kosina
parent 1fd8f04749
commit eec29e3dab
2 changed files with 68 additions and 18 deletions
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9
Documentation/ABI/testing/sysfs-driver-hid-multitouch Normal file
View File

@ -0,0 +1,9 @@
What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/quirks
Date: November 2011
Contact: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Description: The integer value of this attribute corresponds to the
quirks actually in place to handle the device's protocol.
When read, this attribute returns the current settings (see
MT_QUIRKS_* in hid-multitouch.c).
When written this attribute change on the fly the quirks, then
the protocol to handle the device.

77
drivers/hid/hid-multitouch.c
View File

@ -60,9 +60,19 @@ struct mt_slot {
bool seen_in_this_frame;/* has this slot been updated */
};
struct mt_class {
__s32 name; /* MT_CLS */
__s32 quirks;
__s32 sn_move; /* Signal/noise ratio for move events */
__s32 sn_width; /* Signal/noise ratio for width events */
__s32 sn_height; /* Signal/noise ratio for height events */
__s32 sn_pressure; /* Signal/noise ratio for pressure events */
__u8 maxcontacts;
};
struct mt_device {
struct mt_slot curdata; /* placeholder of incoming data */
struct mt_class *mtclass; /* our mt device class */
struct mt_class mtclass; /* our mt device class */
unsigned last_field_index; /* last field index of the report */
unsigned last_slot_field; /* the last field of a slot */
int last_mt_collection; /* last known mt-related collection */
@ -74,16 +84,6 @@ struct mt_device {
struct mt_slot *slots;
};
struct mt_class {
__s32 name; /* MT_CLS */
__s32 quirks;
__s32 sn_move; /* Signal/noise ratio for move events */
__s32 sn_width; /* Signal/noise ratio for width events */
__s32 sn_height; /* Signal/noise ratio for height events */
__s32 sn_pressure; /* Signal/noise ratio for pressure events */
__u8 maxcontacts;
};
/* classes of device behavior */
#define MT_CLS_DEFAULT 0x0001
@ -181,6 +181,44 @@ struct mt_class mt_classes[] = {
{ }
};
static ssize_t mt_show_quirks(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
struct mt_device *td = hid_get_drvdata(hdev);
return sprintf(buf, "%u\n", td->mtclass.quirks);
}
static ssize_t mt_set_quirks(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
struct mt_device *td = hid_get_drvdata(hdev);
unsigned long val;
if (kstrtoul(buf, 0, &val))
return -EINVAL;
td->mtclass.quirks = val;
return count;
}
static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
static struct attribute *sysfs_attrs[] = {
&dev_attr_quirks.attr,
NULL
};
static struct attribute_group mt_attribute_group = {
.attrs = sysfs_attrs
};
static void mt_feature_mapping(struct hid_device *hdev,
struct hid_field *field, struct hid_usage *usage)
{
@ -192,9 +230,9 @@ static void mt_feature_mapping(struct hid_device *hdev,
break;
case HID_DG_CONTACTMAX:
td->maxcontacts = field->value[0];
if (td->mtclass->maxcontacts)
if (td->mtclass.maxcontacts)
/* check if the maxcontacts is given by the class */
td->maxcontacts = td->mtclass->maxcontacts;
td->maxcontacts = td->mtclass.maxcontacts;
break;
}
@ -214,7 +252,7 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
unsigned long **bit, int *max)
{
struct mt_device *td = hid_get_drvdata(hdev);
struct mt_class *cls = td->mtclass;
struct mt_class *cls = &td->mtclass;
__s32 quirks = cls->quirks;
/* Only map fields from TouchScreen or TouchPad collections.
@ -363,7 +401,7 @@ static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
static int mt_compute_slot(struct mt_device *td)
{
__s32 quirks = td->mtclass->quirks;
__s32 quirks = td->mtclass.quirks;
if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
return td->curdata.contactid;
@ -407,7 +445,7 @@ static void mt_emit_event(struct mt_device *td, struct input_dev *input)
for (i = 0; i < td->maxcontacts; ++i) {
struct mt_slot *s = &(td->slots[i]);
if ((td->mtclass->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) &&
if ((td->mtclass.quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) &&
!s->seen_in_this_frame) {
s->touch_state = false;
}
@ -444,7 +482,7 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
struct mt_device *td = hid_get_drvdata(hid);
__s32 quirks = td->mtclass->quirks;
__s32 quirks = td->mtclass.quirks;
if (hid->claimed & HID_CLAIMED_INPUT && td->slots) {
switch (usage->hid) {
@ -552,7 +590,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
dev_err(&hdev->dev, "cannot allocate multitouch data\n");
return -ENOMEM;
}
td->mtclass = mtclass;
td->mtclass = *mtclass;
td->inputmode = -1;
td->last_mt_collection = -1;
hid_set_drvdata(hdev, td);
@ -574,6 +612,8 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
goto fail;
}
ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
mt_set_input_mode(hdev);
return 0;
@ -594,6 +634,7 @@ static int mt_reset_resume(struct hid_device *hdev)
static void mt_remove(struct hid_device *hdev)
{
struct mt_device *td = hid_get_drvdata(hdev);
sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
hid_hw_stop(hdev);
kfree(td->slots);
kfree(td);