Exporting this function allows us to calculate the resolution in third
party drivers like hid-multitouch.
This patch also complete the function with additional valid axes.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxx>
---
drivers/hid/hid-input.c | 11 +++++++++--
drivers/hid/hid-multitouch.c | 1 +
include/linux/hid.h | 1 +
3 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index d917c0d..1b0adc3 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -208,7 +208,7 @@ static int hidinput_setkeycode(struct input_dev *dev,
* Only exponent 1 length units are processed. Centimeters and inches are
* converted to millimeters. Degrees are converted to radians.
*/
-static __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
+__s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
{
__s32 unit_exponent = field->unit_exponent;
__s32 logical_extents = field->logical_maximum -
@@ -229,6 +229,12 @@ static __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
case ABS_X:
case ABS_Y:
case ABS_Z:
+ case ABS_MT_POSITION_X:
+ case ABS_MT_POSITION_Y:
+ case ABS_MT_TOOL_X:
+ case ABS_MT_TOOL_Y:
+ case ABS_MT_TOUCH_MAJOR:
+ case ABS_MT_TOUCH_MINOR:
if (field->unit == 0x11) { /* If centimeters */
/* Convert to millimeters */
unit_exponent += 1;
@@ -281,8 +287,9 @@ static __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
}
/* Calculate resolution */
- return logical_extents / physical_extents;
+ return DIV_ROUND_CLOSEST(logical_extents, physical_extents);
}
+EXPORT_SYMBOL_GPL(hidinput_calc_abs_res);
#ifdef CONFIG_HID_BATTERY_STRENGTH
static enum power_supply_property hidinput_battery_props[] = {
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index c97011c..375a38d 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -298,6 +298,7 @@ static void set_abs(struct input_dev *input, unsigned int code,
int fmax = field->logical_maximum;
int fuzz = snratio ? (fmax - fmin) / snratio : 0;
input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
+ input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
}
static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 7e1f37d..9edb06c 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -743,6 +743,7 @@ int hid_input_report(struct hid_device *, int type, u8 *, int, int);
int hidinput_find_field(struct hid_device *hid, unsigned int type, unsigned int code, struct hid_field **field);
struct hid_field *hidinput_get_led_field(struct hid_device *hid);
unsigned int hidinput_count_leds(struct hid_device *hid);
+__s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code);
void hid_output_report(struct hid_report *report, __u8 *data);
struct hid_device *hid_allocate_device(void);
struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id);
--
1.7.11.7
--
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