static int wacom_parse_hid(struct usb_interface *intf, struct hid_descriptor *hid_desc,
struct wacom_wac *wacom_wac)
{
struct usb_device *dev = interface_to_usbdev(intf);
struct wacom_features *features = wacom_wac->features;
char limit = 0, result = 0;
int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0;
unsigned char *report;
report = kzalloc(hid_desc->wDescriptorLength, GFP_KERNEL);
if (!report)
return -ENOMEM;
/* retrive report descriptors */
do {
result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR,
USB_RECIP_INTERFACE | USB_DIR_IN,
HID_DEVICET_REPORT << 8,
intf->altsetting[0].desc.bInterfaceNumber, /* interface */
report,
hid_desc->wDescriptorLength,
5000); /* 5 secs */
} while (result < 0 && limit++ < 5);
/* No need to parse the Descriptor. It isn't an error though */
if (result < 0)
goto out;
for (i = 0; i < hid_desc->wDescriptorLength; i++) {
switch (report[i]) {
case HID_USAGE_PAGE:
switch (report[i + 1]) {
case HID_USAGE_PAGE_DIGITIZER:
usage = WCM_DIGITIZER;
i++;
break;
case HID_USAGE_PAGE_DESKTOP:
usage = WCM_DESKTOP;
i++;
break;
}
break;
case HID_USAGE:
switch (report[i + 1]) {
case HID_USAGE_X:
if (usage == WCM_DESKTOP) {
if (finger) {
features->touch_x_max =
features->touch_y_max =
wacom_le16_to_cpu(&report[i + 3]);
features->x_max =
wacom_le16_to_cpu(&report[i + 6]);
i += 7;
} else if (pen) {
features->x_max =
wacom_le16_to_cpu(&report[i + 3]);
i += 4;
}
} else if (usage == WCM_DIGITIZER) {
/* max pressure isn't reported
features->pressure_max = (unsigned short)
(report[i+4] << 8 | report[i + 3]);
*/
features->pressure_max = 255;
i += 4;
}
break;
case HID_USAGE_Y:
if (usage == WCM_DESKTOP)
features->y_max =
wacom_le16_to_cpu(&report[i + 3]);
i += 4;
break;
case HID_USAGE_FINGER:
finger = 1;
i++;
break;
case HID_USAGE_STYLUS:
pen = 1;
i++;
break;
case HID_USAGE_UNDEFINED:
if (usage == WCM_DESKTOP && finger) /* capacity */
features->pressure_max =
wacom_le16_to_cpu(&report[i + 3]);
i += 4;
break;
}
break;
case HID_COLLECTION:
/* reset UsagePage ans Finger */
finger = usage = 0;
break;
}
}
out:
result = 0;
kfree(report);
return result;
}
static int wacom_parse_hid(struct usb_interface *intf, struct hid_descriptor *hid_desc,
struct wacom_features *features)
{
struct usb_device *dev = interface_to_usbdev(intf);
char limit = 0;
/* result has to be defined as int for some devices */
int result = 0;
int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0;
unsigned char *report;
report = kzalloc(hid_desc->wDescriptorLength, GFP_KERNEL);
if (!report)
return -ENOMEM;
/* retrive report descriptors */
do {
result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR,
USB_RECIP_INTERFACE | USB_DIR_IN,
HID_DEVICET_REPORT << 8,
intf->altsetting[0].desc.bInterfaceNumber, /* interface */
report,
hid_desc->wDescriptorLength,
5000); /* 5 secs */
} while (result < 0 && limit++ < 5);
/* No need to parse the Descriptor. It isn't an error though */
if (result < 0)
goto out;
for (i = 0; i < hid_desc->wDescriptorLength; i++) {
switch (report[i]) {
case HID_USAGE_PAGE:
switch (report[i + 1]) {
case HID_USAGE_PAGE_DIGITIZER:
usage = WCM_DIGITIZER;
i++;
break;
case HID_USAGE_PAGE_DESKTOP:
usage = WCM_DESKTOP;
i++;
break;
}
break;
case HID_USAGE:
switch (report[i + 1]) {
case HID_USAGE_X:
if (usage == WCM_DESKTOP) {
if (finger) {
features->device_type = BTN_TOOL_FINGER;
if (features->type == TABLETPC2FG) {
/* need to reset back */
features->pktlen = WACOM_PKGLEN_TPC2FG;
}
features->x_max =
wacom_le16_to_cpu(&report[i + 3]);
features->x_phy =
wacom_le16_to_cpu(&report[i + 6]);
features->unit = report[i + 9];
features->unitExpo = report[i + 11];
i += 12;
} else if (pen) {
/* penabled only accepts exact bytes of data */
if (features->type == TABLETPC2FG)
features->pktlen = WACOM_PKGLEN_PENABLED;
features->device_type = BTN_TOOL_PEN;
features->x_max =
wacom_le16_to_cpu(&report[i + 3]);
i += 4;
}
} else if (usage == WCM_DIGITIZER) {
/* max pressure isn't reported
features->pressure_max = (unsigned short)
(report[i+4] << 8 | report[i + 3]);
*/
features->pressure_max = 255;
i += 4;
}
break;
case HID_USAGE_Y:
if (usage == WCM_DESKTOP) {
if (finger) {
features->device_type = BTN_TOOL_FINGER;
if (features->type == TABLETPC2FG) {
/* need to reset back */
features->pktlen = WACOM_PKGLEN_TPC2FG;
features->y_max =
wacom_le16_to_cpu(&report[i + 3]);
features->y_phy =
wacom_le16_to_cpu(&report[i + 6]);
i += 7;
} else {
features->y_max =
features->x_max;
features->y_phy =
wacom_le16_to_cpu(&report[i + 3]);
i += 4;
}
} else if (pen) {
/* penabled only accepts exact bytes of data */
if (features->type == TABLETPC2FG)
features->pktlen = WACOM_PKGLEN_PENABLED;
features->device_type = BTN_TOOL_PEN;
features->y_max =
wacom_le16_to_cpu(&report[i + 3]);
i += 4;
}
}
break;
case HID_USAGE_FINGER:
finger = 1;
i++;
break;
case HID_USAGE_STYLUS:
pen = 1;
i++;
break;
}
break;
case HID_COLLECTION:
/* reset UsagePage and Finger */
finger = usage = 0;
break;
}
}
out:
result = 0;
kfree(report);
return result;
}