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Input: wacom - clean up wacom_query_tablet_data

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Rewrites this function to be easier to read and understand. The new
function 'wacom_set_device_mode' now handles the grunt work of
assembling the proper feature report, sending it to the device,
and ensuring the setting "sticks".

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Tested-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Jason Gerecke 2012-10-03 17:25:35 -07:00 committed by Dmitry Torokhov
parent 115d5e12a7
commit fe494bc2f6
1 changed files with 36 additions and 40 deletions
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70
drivers/input/tablet/wacom_sys.c
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@ -502,58 +502,54 @@ static int wacom_parse_hid(struct usb_interface *intf,
return result; return result;
} }
static int wacom_query_tablet_data(struct usb_interface *intf, struct wacom_features *features) static int wacom_set_device_mode(struct usb_interface *intf, int report_id, int length, int mode)
{ {
unsigned char *rep_data; unsigned char *rep_data;
int limit = 0, report_id = 2; int error = -ENOMEM, limit = 0;
int error = -ENOMEM;
rep_data = kmalloc(4, GFP_KERNEL); rep_data = kzalloc(length, GFP_KERNEL);
if (!rep_data) if (!rep_data)
return error; return error;
/* ask to report Wacom data */ rep_data[0] = report_id;
if (features->device_type == BTN_TOOL_FINGER) { rep_data[1] = mode;
/* if it is an MT Tablet PC touch */
if (features->type > TABLETPC) {
do { do {
rep_data[0] = 3;
rep_data[1] = 4;
rep_data[2] = 0;
rep_data[3] = 0;
report_id = 3;
error = wacom_set_report(intf,
WAC_HID_FEATURE_REPORT,
report_id,
rep_data, 4, 1);
if (error >= 0)
error = wacom_get_report(intf,
WAC_HID_FEATURE_REPORT,
report_id,
rep_data, 4, 1);
} while ((error < 0 || rep_data[1] != 4) &&
limit++ < WAC_MSG_RETRIES);
}
} else if (features->type <= BAMBOO_PT &&
features->type != WIRELESS &&
features->device_type == BTN_TOOL_PEN) {
do {
rep_data[0] = 2;
rep_data[1] = 2;
error = wacom_set_report(intf, WAC_HID_FEATURE_REPORT, error = wacom_set_report(intf, WAC_HID_FEATURE_REPORT,
report_id, rep_data, 2, 1); report_id, rep_data, length, 1);
if (error >= 0) if (error >= 0)
error = wacom_get_report(intf, error = wacom_get_report(intf, WAC_HID_FEATURE_REPORT,
WAC_HID_FEATURE_REPORT, report_id, rep_data, length, 1);
report_id, rep_data, 2, 1); } while ((error < 0 || rep_data[1] != mode) && limit++ < WAC_MSG_RETRIES);
} while ((error < 0 || rep_data[1] != 2) && limit++ < WAC_MSG_RETRIES);
}
kfree(rep_data); kfree(rep_data);
return error < 0 ? error : 0; return error < 0 ? error : 0;
} }
/*
* Switch the tablet into its most-capable mode. Wacom tablets are
* typically configured to power-up in a mode which sends mouse-like
* reports to the OS. To get absolute position, pressure data, etc.
* from the tablet, it is necessary to switch the tablet out of this
* mode and into one which sends the full range of tablet data.
*/
static int wacom_query_tablet_data(struct usb_interface *intf, struct wacom_features *features)
{
if (features->device_type == BTN_TOOL_FINGER) {
if (features->type > TABLETPC) {
/* MT Tablet PC touch */
return wacom_set_device_mode(intf, 3, 4, 4);
}
} else if (features->device_type == BTN_TOOL_PEN) {
if (features->type <= BAMBOO_PT && features->type != WIRELESS) {
return wacom_set_device_mode(intf, 2, 2, 2);
}
}
return 0;
}
static int wacom_retrieve_hid_descriptor(struct usb_interface *intf, static int wacom_retrieve_hid_descriptor(struct usb_interface *intf,
struct wacom_features *features) struct wacom_features *features)
{ {