diff options
| author |   Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2014-07-24 13:03:05 -0700 |
|---|---|---|
| committer |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2014-07-25 18:53:55 -0700 |
| commit | 198fdee2829547ec4ff29bb56ea668790d23bc4b (patch) | |
| tree | 9a054b2cd421e7f4451ffb96b3eef5e19fd49aef /drivers/input | |
| parent | Input: wacom - use in-kernel HID parser (diff) | |
| download | linux-dev-198fdee2829547ec4ff29bb56ea668790d23bc4b.tar.xz linux-dev-198fdee2829547ec4ff29bb56ea668790d23bc4b.zip | |
Input: wacom - use hidinput_calc_abs_res instead of duplicating its code
This may infer a small difference with the previous implementation
due to the DIV_ROUND_CLOSEST() in the hid implementation.
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>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/tablet/wacom_sys.c | 48 |
1 files changed, 9 insertions, 39 deletions
diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c index ed27e7da5444..06e304b3bbfd 100644 --- a/drivers/input/tablet/wacom_sys.c +++ b/drivers/input/tablet/wacom_sys.c @@ -85,49 +85,19 @@ static void wacom_close(struct input_dev *dev) } /* - * Calculate the resolution of the X or Y axis, given appropriate HID data. - * This function is little more than hidinput_calc_abs_res stripped down. + * Calculate the resolution of the X or Y axis using hidinput_calc_abs_res. */ static int wacom_calc_hid_res(int logical_extents, int physical_extents, unsigned unit, int exponent) { - int prev; - int unit_exponent = exponent; - - /* Check if the extents are sane */ - if (logical_extents <= 0 || physical_extents <= 0) - return 0; - - /* Convert physical_extents to millimeters */ - if (unit == 0x11) { /* If centimeters */ - unit_exponent += 1; - } else if (unit == 0x13) { /* If inches */ - prev = physical_extents; - physical_extents *= 254; - if (physical_extents < prev) - return 0; - unit_exponent -= 1; - } else { - return 0; - } - - /* Apply negative unit exponent */ - for (; unit_exponent < 0; unit_exponent++) { - prev = logical_extents; - logical_extents *= 10; - if (logical_extents < prev) - return 0; - } - /* Apply positive unit exponent */ - for (; unit_exponent > 0; unit_exponent--) { - prev = physical_extents; - physical_extents *= 10; - if (physical_extents < prev) - return 0; - } - - /* Calculate resolution */ - return logical_extents / physical_extents; + struct hid_field field = { + .logical_maximum = logical_extents, + .physical_maximum = physical_extents, + .unit = unit, + .unit_exponent = exponent, + }; + + return hidinput_calc_abs_res(&field, ABS_X); } static void wacom_feature_mapping(struct hid_device *hdev, |