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Input: wacom - compute the HID report size to get the actual packet size

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This removes an USB dependency and is more accurate: the computed pktlen
is the actual maximum size of the reports forwarded by the device.

Given that the pktlen is correctly computed/validated, we can store it now
in the features struct instead of having a special handling in the rest of
the code.

Likewise, this information is not mandatory anymore in the description
of devices in wacom_wac.c. They will be removed in a separate patch.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Jason Gerecke <killertofu@gmail.com>
Tested-by: Jason Gerecke <killertofu@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Benjamin Tissoires 2014-07-24 12:59:11 -07:00 committed by Dmitry Torokhov
parent ba9a3541fb
commit 01c846f953
1 changed files with 26 additions and 32 deletions
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58
drivers/input/tablet/wacom_sys.c
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@ -149,7 +149,6 @@ static int wacom_parse_logical_collection(unsigned char *report,
if (features->type == BAMBOO_PT) {
/* Logical collection is only used by 3rd gen Bamboo Touch */
features->pktlen = WACOM_PKGLEN_BBTOUCH3;
features->device_type = BTN_TOOL_FINGER;
features->x_max = features->y_max =
@ -240,29 +239,6 @@ static int wacom_parse_hid(struct hid_device *hdev,
features->device_type = BTN_TOOL_FINGER;
/* touch device at least supports one touch point */
touch_max = 1;
switch (features->type) {
case TABLETPC2FG:
features->pktlen = WACOM_PKGLEN_TPC2FG;
break;
case MTSCREEN:
case WACOM_24HDT:
features->pktlen = WACOM_PKGLEN_MTOUCH;
break;
case MTTPC:
case MTTPC_B:
features->pktlen = WACOM_PKGLEN_MTTPC;
break;
case BAMBOO_PT:
features->pktlen = WACOM_PKGLEN_BBTOUCH;
break;
default:
features->pktlen = WACOM_PKGLEN_GRAPHIRE;
break;
}
switch (features->type) {
case BAMBOO_PT:
@ -305,8 +281,6 @@ static int wacom_parse_hid(struct hid_device *hdev,
}
} else if (pen) {
/* penabled only accepts exact bytes of data */
if (features->type >= TABLETPC)
features->pktlen = WACOM_PKGLEN_GRAPHIRE;
features->device_type = BTN_TOOL_PEN;
features->x_max =
get_unaligned_le16(&report[i + 3]);
@ -1224,12 +1198,34 @@ static void wacom_calculate_res(struct wacom_features *features)
features->unitExpo);
}
static int wacom_hid_report_len(struct hid_report *report)
{
/* equivalent to DIV_ROUND_UP(report->size, 8) + !!(report->id > 0) */
return ((report->size - 1) >> 3) + 1 + (report->id > 0);
}
static size_t wacom_compute_pktlen(struct hid_device *hdev)
{
struct hid_report_enum *report_enum;
struct hid_report *report;
size_t size = 0;
report_enum = hdev->report_enum + HID_INPUT_REPORT;
list_for_each_entry(report, &report_enum->report_list, list) {
size_t report_size = wacom_hid_report_len(report);
if (report_size > size)
size = report_size;
}
return size;
}
static int wacom_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
struct usb_device *dev = interface_to_usbdev(intf);
struct usb_endpoint_descriptor *endpoint;
struct wacom *wacom;
struct wacom_wac *wacom_wac;
struct wacom_features *features;
@ -1255,6 +1251,7 @@ static int wacom_probe(struct hid_device *hdev,
wacom_wac = &wacom->wacom_wac;
wacom_wac->features = *((struct wacom_features *)id->driver_data);
features = &wacom_wac->features;
features->pktlen = wacom_compute_pktlen(hdev);
if (features->pktlen > WACOM_PKGLEN_MAX) {
error = -EINVAL;
goto fail1;
@ -1272,8 +1269,6 @@ static int wacom_probe(struct hid_device *hdev,
usb_make_path(dev, wacom->phys, sizeof(wacom->phys));
strlcat(wacom->phys, "/input0", sizeof(wacom->phys));
endpoint = &intf->cur_altsetting->endpoint[0].desc;
/* set the default size in case we do not get them from hid */
wacom_set_default_phy(features);
@ -1284,13 +1279,12 @@ static int wacom_probe(struct hid_device *hdev,
/*
* Intuos5 has no useful data about its touch interface in its
* HID descriptor. If this is the touch interface (wMaxPacketSize
* HID descriptor. If this is the touch interface (PacketSize
* of WACOM_PKGLEN_BBTOUCH3), override the table values.
*/
if (features->type >= INTUOS5S && features->type <= INTUOSHT) {
if (endpoint->wMaxPacketSize == WACOM_PKGLEN_BBTOUCH3) {
if (features->pktlen == WACOM_PKGLEN_BBTOUCH3) {
features->device_type = BTN_TOOL_FINGER;
features->pktlen = WACOM_PKGLEN_BBTOUCH3;
features->x_max = 4096;
features->y_max = 4096;