| Message ID | 20211212124242.81019-2-hdegoede@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | [1/5] Input: Add input_copy_abs() function | expand |
Hi Hans, On Sun, Dec 12, 2021 at 01:42:38PM +0100, Hans de Goede wrote: > Add a new helper function to copy absinfo from one input_dev to > another input_dev. > > This is useful to e.g. setup a pen/stylus input-device for combined > touchscreen/pen hardware where the pen uses the same coordinates as > the touchscreen. > > Suggested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> > Signed-off-by: Hans de Goede <hdegoede@redhat.com> > --- > drivers/input/input.c | 34 ++++++++++++++++++++++++++++++++++ > include/linux/input.h | 2 ++ > 2 files changed, 36 insertions(+) > > diff --git a/drivers/input/input.c b/drivers/input/input.c > index ccaeb2426385..60f3eb38906f 100644 > --- a/drivers/input/input.c > +++ b/drivers/input/input.c > @@ -526,6 +526,40 @@ void input_set_abs_params(struct input_dev *dev, unsigned int axis, > } > EXPORT_SYMBOL(input_set_abs_params); > > +/** > + * input_copy_abs - Copy absinfo from one input_dev to another > + * @dst: Destination input device to copy the abs settings to > + * @dst_axis: ABS_* value selecting the destination axis > + * @src: Source input device to copy the abs settings from > + * @src_axis: ABS_* value selecting the source axis > + * > + * Set absinfo for the selected destination axis by copying it from > + * the specified source input device's source axis. > + * This is useful to e.g. setup a pen/stylus input-device for combined > + * touchscreen/pen hardware where the pen uses the same coordinates as > + * the touchscreen. > + */ > +void input_copy_abs(struct input_dev *dst, unsigned int dst_axis, > + const struct input_dev *src, unsigned int src_axis) > +{ > + /* > + * input_alloc_absinfo() may have failed for the source. Our caller is > + * expected to catch this when registering the input devices, which may > + * happen after the input_copy_abs() call. > + */ > + if (!src->absinfo) > + return; I'd probably check if source device actually declared EV_ABS/src_axis and yelled loudly (WARN?) in such case. > + > + input_alloc_absinfo(dst); > + if (!dst->absinfo) > + return; > + > + dst->absinfo[dst_axis] = src->absinfo[src_axis]; > + > + __set_bit(EV_ABS, dst->evbit); > + __set_bit(dst_axis, dst->absbit); input_set_capability() ? > +} > +EXPORT_SYMBOL(input_copy_abs); Thanks.
Hi Dmitry, Thank you for your review of this patch series; and sorry for being so slow in getting back to you on this. On 12/13/21 05:58, Dmitry Torokhov wrote: > Hi Hans, > > On Sun, Dec 12, 2021 at 01:42:38PM +0100, Hans de Goede wrote: >> Add a new helper function to copy absinfo from one input_dev to >> another input_dev. >> >> This is useful to e.g. setup a pen/stylus input-device for combined >> touchscreen/pen hardware where the pen uses the same coordinates as >> the touchscreen. >> >> Suggested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> >> Signed-off-by: Hans de Goede <hdegoede@redhat.com> >> --- >> drivers/input/input.c | 34 ++++++++++++++++++++++++++++++++++ >> include/linux/input.h | 2 ++ >> 2 files changed, 36 insertions(+) >> >> diff --git a/drivers/input/input.c b/drivers/input/input.c >> index ccaeb2426385..60f3eb38906f 100644 >> --- a/drivers/input/input.c >> +++ b/drivers/input/input.c >> @@ -526,6 +526,40 @@ void input_set_abs_params(struct input_dev *dev, unsigned int axis, >> } >> EXPORT_SYMBOL(input_set_abs_params); >> >> +/** >> + * input_copy_abs - Copy absinfo from one input_dev to another >> + * @dst: Destination input device to copy the abs settings to >> + * @dst_axis: ABS_* value selecting the destination axis >> + * @src: Source input device to copy the abs settings from >> + * @src_axis: ABS_* value selecting the source axis >> + * >> + * Set absinfo for the selected destination axis by copying it from >> + * the specified source input device's source axis. >> + * This is useful to e.g. setup a pen/stylus input-device for combined >> + * touchscreen/pen hardware where the pen uses the same coordinates as >> + * the touchscreen. >> + */ >> +void input_copy_abs(struct input_dev *dst, unsigned int dst_axis, >> + const struct input_dev *src, unsigned int src_axis) >> +{ >> + /* >> + * input_alloc_absinfo() may have failed for the source. Our caller is >> + * expected to catch this when registering the input devices, which may >> + * happen after the input_copy_abs() call. >> + */ >> + if (!src->absinfo) >> + return; > > I'd probably check if source device actually declared EV_ABS/src_axis > and yelled loudly (WARN?) in such case. Ack, I will add this for v2. > >> + >> + input_alloc_absinfo(dst); >> + if (!dst->absinfo) >> + return; >> + >> + dst->absinfo[dst_axis] = src->absinfo[src_axis]; >> + >> + __set_bit(EV_ABS, dst->evbit); >> + __set_bit(dst_axis, dst->absbit); > > input_set_capability() ? Ack. Regards, Hans > >> +} >> +EXPORT_SYMBOL(input_copy_abs); > > Thanks. >
diff --git a/drivers/input/input.c b/drivers/input/input.c index ccaeb2426385..60f3eb38906f 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -526,6 +526,40 @@ void input_set_abs_params(struct input_dev *dev, unsigned int axis, } EXPORT_SYMBOL(input_set_abs_params); +/** + * input_copy_abs - Copy absinfo from one input_dev to another + * @dst: Destination input device to copy the abs settings to + * @dst_axis: ABS_* value selecting the destination axis + * @src: Source input device to copy the abs settings from + * @src_axis: ABS_* value selecting the source axis + * + * Set absinfo for the selected destination axis by copying it from + * the specified source input device's source axis. + * This is useful to e.g. setup a pen/stylus input-device for combined + * touchscreen/pen hardware where the pen uses the same coordinates as + * the touchscreen. + */ +void input_copy_abs(struct input_dev *dst, unsigned int dst_axis, + const struct input_dev *src, unsigned int src_axis) +{ + /* + * input_alloc_absinfo() may have failed for the source. Our caller is + * expected to catch this when registering the input devices, which may + * happen after the input_copy_abs() call. + */ + if (!src->absinfo) + return; + + input_alloc_absinfo(dst); + if (!dst->absinfo) + return; + + dst->absinfo[dst_axis] = src->absinfo[src_axis]; + + __set_bit(EV_ABS, dst->evbit); + __set_bit(dst_axis, dst->absbit); +} +EXPORT_SYMBOL(input_copy_abs); /** * input_grab_device - grabs device for exclusive use diff --git a/include/linux/input.h b/include/linux/input.h index 0354b298d874..49790c1bd2c4 100644 --- a/include/linux/input.h +++ b/include/linux/input.h @@ -475,6 +475,8 @@ static inline void input_set_events_per_packet(struct input_dev *dev, int n_even void input_alloc_absinfo(struct input_dev *dev); void input_set_abs_params(struct input_dev *dev, unsigned int axis, int min, int max, int fuzz, int flat); +void input_copy_abs(struct input_dev *dst, unsigned int dst_axis, + const struct input_dev *src, unsigned int src_axis); #define INPUT_GENERATE_ABS_ACCESSORS(_suffix, _item) \ static inline int input_abs_get_##_suffix(struct input_dev *dev, \
Add a new helper function to copy absinfo from one input_dev to another input_dev. This is useful to e.g. setup a pen/stylus input-device for combined touchscreen/pen hardware where the pen uses the same coordinates as the touchscreen. Suggested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> --- drivers/input/input.c | 34 ++++++++++++++++++++++++++++++++++ include/linux/input.h | 2 ++ 2 files changed, 36 insertions(+)