>From the HID usage table when it is supported.
Tested-by: Chris Bagwell <chris@xxxxxxxxxxxxxx>
Reviewed-by: Chris Bagwell <chris@xxxxxxxxxxxxxx>
Signed-off-by: Ping Cheng <pingc@xxxxxxxxx>
---
v2: updated with Chris' comments.
drivers/input/tablet/wacom_sys.c | 31 ++++++++++++++++++++++++++++++-
drivers/input/tablet/wacom_wac.c | 10 ++++------
drivers/input/tablet/wacom_wac.h | 1 +
3 files changed, 35 insertions(+), 7 deletions(-)
diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
index c9588ee..f7fe091 100644
--- a/drivers/input/tablet/wacom_sys.c
+++ b/drivers/input/tablet/wacom_sys.c
@@ -28,6 +28,7 @@
#define HID_USAGE_Y_TILT 0x3e
#define HID_USAGE_FINGER 0x22
#define HID_USAGE_STYLUS 0x20
+#define HID_USAGE_CONTACTMAX 0x55
#define HID_COLLECTION 0xa1
#define HID_COLLECTION_LOGICAL 0x02
#define HID_COLLECTION_END 0xc0
@@ -191,11 +192,30 @@ static int wacom_parse_logical_collection(unsigned char *report,
features->x_max = features->y_max =
get_unaligned_le16(&report[10]);
+ features->touch_max = 16;
length = 11;
}
return length;
}
+static void wacom_retrieve_report_data(struct usb_interface *intf,
+ struct wacom_features *features)
+{
+ int result = 0;
+ unsigned char *rep_data;
+
+ rep_data = kmalloc(2, GFP_KERNEL);
+ if (!rep_data)
+ return;
+
+ rep_data[0] = 12;
+ result = wacom_get_report(intf, WAC_HID_FEATURE_REPORT,
+ rep_data[0], rep_data, 2, WAC_MSG_RETRIES);
+
+ if ((result >= 0) && (rep_data[1] > 2))
+ features->touch_max = rep_data[1];
+}
+
/*
* Interface Descriptor of wacom devices can be incomplete and
* inconsistent so wacom_features table is used to store stylus
@@ -286,16 +306,19 @@ static int wacom_parse_hid(struct usb_interface *intf,
if (features->type == TABLETPC2FG) {
/* need to reset back */
features->pktlen = WACOM_PKGLEN_TPC2FG;
+ features->touch_max = 2;
}
if (features->type == BAMBOO_PT) {
/* need to reset back */
features->pktlen = WACOM_PKGLEN_BBTOUCH;
+ features->touch_max = 2;
features->x_phy =
get_unaligned_le16(&report[i + 5]);
features->x_max =
get_unaligned_le16(&report[i + 8]);
i += 15;
} else {
+ features->touch_max = 1;
features->x_max =
get_unaligned_le16(&report[i + 3]);
features->x_phy =
@@ -369,6 +392,11 @@ static int wacom_parse_hid(struct usb_interface *intf,
pen = 1;
i++;
break;
+
+ case HID_USAGE_CONTACTMAX:
+ wacom_retrieve_report_data(intf, features);
+ i++;
+ break;
}
break;
@@ -873,7 +901,8 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i
endpoint = &intf->cur_altsetting->endpoint[0].desc;
- /* Retrieve the physical and logical size for OEM devices */
+ /* Retrieve the physical and logical size for touch devices */
+ features->touch_max = 0;
error = wacom_retrieve_hid_descriptor(intf, features);
if (error)
goto fail3;
diff --git a/drivers/input/tablet/wacom_wac.c b/drivers/input/tablet/wacom_wac.c
index e18f362..33a4359 100644
--- a/drivers/input/tablet/wacom_wac.c
+++ b/drivers/input/tablet/wacom_wac.c
@@ -830,7 +830,8 @@ static int wacom_tpc_irq(struct wacom_wac *wacom, size_t len)
{
char *data = wacom->data;
- dbg("wacom_tpc_irq: received report #%d", data[0]);
+ dbg("wacom_tpc_irq: received report #%d with %d contacts",
+ data[0], wacom->features.touch_max);
if (len == WACOM_PKGLEN_TPC1FG || data[0] == WACOM_REPORT_TPC1FG)
return wacom_tpc_single_touch(wacom, len);
@@ -1319,7 +1320,7 @@ void wacom_setup_input_capabilities(struct input_dev *input_dev,
case TABLETPC2FG:
if (features->device_type == BTN_TOOL_FINGER) {
- input_mt_init_slots(input_dev, 2);
+ input_mt_init_slots(input_dev, features->touch_max);
input_set_abs_params(input_dev, ABS_MT_TOOL_TYPE,
0, MT_TOOL_MAX, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
@@ -1374,6 +1375,7 @@ void wacom_setup_input_capabilities(struct input_dev *input_dev,
__set_bit(BTN_TOOL_FINGER, input_dev->keybit);
__set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
+ input_mt_init_slots(input_dev, features->touch_max);
if (features->pktlen == WACOM_PKGLEN_BBTOUCH3) {
__set_bit(BTN_TOOL_TRIPLETAP,
@@ -1381,13 +1383,9 @@ void wacom_setup_input_capabilities(struct input_dev *input_dev,
__set_bit(BTN_TOOL_QUADTAP,
input_dev->keybit);
- input_mt_init_slots(input_dev, 16);
-
input_set_abs_params(input_dev,
ABS_MT_TOUCH_MAJOR,
0, 255, 0, 0);
- } else {
- input_mt_init_slots(input_dev, 2);
}
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
diff --git a/drivers/input/tablet/wacom_wac.h b/drivers/input/tablet/wacom_wac.h
index 050acae..6ddd2e4 100644
--- a/drivers/input/tablet/wacom_wac.h
+++ b/drivers/input/tablet/wacom_wac.h
@@ -89,6 +89,7 @@ struct wacom_features {
int pressure_fuzz;
int distance_fuzz;
unsigned quirks;
+ unsigned touch_max;
};
struct wacom_shared {
--
1.7.6.4
--
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