From fe494bc2f6e47f02a78ec4761117187db40381a6 Mon Sep 17 00:00:00 2001 From: Jason Gerecke Date: Wed, 3 Oct 2012 17:25:35 -0700 Subject: [PATCH] Input: wacom - clean up wacom_query_tablet_data 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 Tested-by: Ping Cheng Signed-off-by: Dmitry Torokhov --- drivers/input/tablet/wacom_sys.c | 74 +++++++++++++++++++--------------------- 1 file changed, 35 insertions(+), 39 deletions(-) diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c index b44bba2..9edf980 100644 --- a/drivers/input/tablet/wacom_sys.c +++ b/drivers/input/tablet/wacom_sys.c @@ -502,56 +502,52 @@ static int wacom_parse_hid(struct usb_interface *intf, 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; - int limit = 0, report_id = 2; - int error = -ENOMEM; + int error = -ENOMEM, limit = 0; - rep_data = kmalloc(4, GFP_KERNEL); + rep_data = kzalloc(length, GFP_KERNEL); if (!rep_data) return error; - /* ask to report Wacom data */ + rep_data[0] = report_id; + rep_data[1] = mode; + + do { + error = wacom_set_report(intf, WAC_HID_FEATURE_REPORT, + report_id, rep_data, length, 1); + if (error >= 0) + error = wacom_get_report(intf, WAC_HID_FEATURE_REPORT, + report_id, rep_data, length, 1); + } while ((error < 0 || rep_data[1] != mode) && limit++ < WAC_MSG_RETRIES); + + kfree(rep_data); + + 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 it is an MT Tablet PC touch */ if (features->type > TABLETPC) { - 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); + /* 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); } - } 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, - report_id, rep_data, 2, 1); - if (error >= 0) - error = wacom_get_report(intf, - WAC_HID_FEATURE_REPORT, - report_id, rep_data, 2, 1); - } while ((error < 0 || rep_data[1] != 2) && limit++ < WAC_MSG_RETRIES); } - kfree(rep_data); - - return error < 0 ? error : 0; + return 0; } static int wacom_retrieve_hid_descriptor(struct usb_interface *intf, -- 2.7.4