HID: multitouch: create sysfs attribute to control quirks from user-space (eec29e3d) · Commits · e / devices / android_kernel_oneplus_sm8150

Documentation/ABI/testing/sysfs-driver-hid-multitouch

0 → 100644

+9 −0

Original line number	Diff line number	Diff line
		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.

drivers/hid/hid-multitouch.c

+59 −18

Original line number	Diff line number	Diff line
		@@ -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);