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Subject[PATCH 2/8] hid-multitouch: create sysfs attribute to control quirks from user-space
Date
From: Benjamin Tissoires <benjamin.tissoires@gmail.com>

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
---
.../ABI/testing/sysfs-driver-hid-multitouch | 9 +++
drivers/hid/hid-multitouch.c | 77 +++++++++++++++-----
2 files changed, 68 insertions(+), 18 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-driver-hid-multitouch
diff --git a/Documentation/ABI/testing/sysfs-driver-hid-multitouch b/Documentation/ABI/testing/sysfs-driver-hid-multitouch
new file mode 100644
index 0000000..f79839d
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-hid-multitouch
@@ -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.
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 1bd918b..f41bcea 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -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 @@ static 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);
--
1.7.4.4


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