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HID: uclogic: Support disabling pen usage 

Restore the ability to disable pen usage in hid-uclogic to support e.g.
keyboard interfaces which also have pen usages for some reason, but
which we don't want to rewrite report descriptors for.

Signed-off-by: Nikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Nikolai Kondrashov 2022-04-21 19:50:51 +02:00 committed by Jiri Kosina
parent d64a6e4460
commit f5927973f8
2 changed files with 26 additions and 0 deletions
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19
drivers/hid/hid-uclogic-core.c
View File

@ -81,6 +81,24 @@ static __u8 *uclogic_report_fixup(struct hid_device *hdev, __u8 *rdesc,
return rdesc;
}
static int uclogic_input_mapping(struct hid_device *hdev,
struct hid_input *hi,
struct hid_field *field,
struct hid_usage *usage,
unsigned long **bit,
int *max)
{
struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
struct uclogic_params *params = &drvdata->params;
/* Discard invalid pen usages */
if (params->pen.usage_invalid && (field->application == HID_DG_PEN))
return -1;
/* Let hid-core decide what to do */
return 0;
}
static int uclogic_input_configured(struct hid_device *hdev,
struct hid_input *hi)
{
@ -515,6 +533,7 @@ static struct hid_driver uclogic_driver = {
.remove = uclogic_remove,
.report_fixup = uclogic_report_fixup,
.raw_event = uclogic_raw_event,
.input_mapping = uclogic_input_mapping,
.input_configured = uclogic_input_configured,
#ifdef CONFIG_PM
.resume = uclogic_resume,

7
drivers/hid/hid-uclogic-params.h
View File

@ -61,6 +61,11 @@ struct uclogic_params_pen_subreport {
* Noop (preserving functionality) when filled with zeroes.
*/
struct uclogic_params_pen {
/*
* True if pen usage is invalid for this interface and should be
* ignored, false otherwise.
*/
bool usage_invalid;
/*
* Pointer to report descriptor part describing the pen inputs.
* Allocated with kmalloc. NULL if the part is not specified.
@ -214,6 +219,7 @@ extern int uclogic_params_init(struct uclogic_params *params,
".desc_ptr = %p\n" \
".desc_size = %u\n" \
".pen = {\n" \
"\t.usage_invalid = %s\n" \
"\t.desc_ptr = %p\n" \
"\t.desc_size = %u\n" \
"\t.id = %u\n" \
@ -270,6 +276,7 @@ extern int uclogic_params_init(struct uclogic_params *params,
((_params)->invalid ? "true" : "false"), \
(_params)->desc_ptr, \
(_params)->desc_size, \
((_params)->pen.usage_invalid ? "true" : "false"), \
(_params)->pen.desc_ptr, \
(_params)->pen.desc_size, \
(_params)->pen.id, \