diff options
Diffstat (limited to 'drivers/hid/hid-input.c')
| -rw-r--r-- | drivers/hid/hid-input.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c index b9b8c75a6f9..c6ee632bfd6 100644 --- a/drivers/hid/hid-input.c +++ b/drivers/hid/hid-input.c @@ -976,6 +976,48 @@ int hidinput_find_field(struct hid_device *hid, unsigned int type, unsigned int } EXPORT_SYMBOL_GPL(hidinput_find_field); +struct hid_field *hidinput_get_led_field(struct hid_device *hid) +{ + struct hid_report *report; + struct hid_field *field; + int i, j; + + list_for_each_entry(report, + &hid->report_enum[HID_OUTPUT_REPORT].report_list, + list) { + for (i = 0; i < report->maxfield; i++) { + field = report->field[i]; + for (j = 0; j < field->maxusage; j++) + if (field->usage[j].type == EV_LED) + return field; + } + } + return NULL; +} +EXPORT_SYMBOL_GPL(hidinput_get_led_field); + +unsigned int hidinput_count_leds(struct hid_device *hid) +{ + struct hid_report *report; + struct hid_field *field; + int i, j; + unsigned int count = 0; + + list_for_each_entry(report, + &hid->report_enum[HID_OUTPUT_REPORT].report_list, + list) { + for (i = 0; i < report->maxfield; i++) { + field = report->field[i]; + for (j = 0; j < field->maxusage; j++) + if (field->usage[j].type == EV_LED && + field->value[j]) + count += 1; + } + } + return count; +} +EXPORT_SYMBOL_GPL(hidinput_count_leds); + static int hidinput_open(struct input_dev *dev) { struct hid_device *hid = input_get_drvdata(dev); |