diff options
author | Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2013-03-22 18:38:28 +0100 |
---|---|---|
committer | Jiri Kosina <jkosina@suse.cz> | 2013-03-27 14:02:45 +0100 |
commit | 4f22decf9b6329acfe59091c5cba6b378b9b31db (patch) | |
tree | fddbec2a0158f8d93cfe6fc886d459b3c2f81664 | |
parent | b3fecf8cab6441527ab057c99d7e6a6d7f6713e5 (diff) | |
download | linux-4f22decf9b6329acfe59091c5cba6b378b9b31db.tar.bz2 |
HID: input: don't register unmapped input devices
There is no need to register an input device containing no events.
This allows drivers using the quirk MULTI_INPUT to register one input
per report effectively used.
For backward compatibility, we need to add a quirk to request
this behavior.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
-rw-r--r-- | drivers/hid/hid-input.c | 77 | ||||
-rw-r--r-- | include/linux/hid.h | 1 |
2 files changed, 78 insertions, 0 deletions
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c index 21b196c394b1..945b8158ec4c 100644 --- a/drivers/hid/hid-input.c +++ b/drivers/hid/hid-input.c @@ -1198,6 +1198,67 @@ static struct hid_input *hidinput_allocate(struct hid_device *hid) return hidinput; } +static bool hidinput_has_been_populated(struct hid_input *hidinput) +{ + int i; + unsigned long r = 0; + + for (i = 0; i < BITS_TO_LONGS(EV_CNT); i++) + r |= hidinput->input->evbit[i]; + + for (i = 0; i < BITS_TO_LONGS(KEY_CNT); i++) + r |= hidinput->input->keybit[i]; + + for (i = 0; i < BITS_TO_LONGS(REL_CNT); i++) + r |= hidinput->input->relbit[i]; + + for (i = 0; i < BITS_TO_LONGS(ABS_CNT); i++) + r |= hidinput->input->absbit[i]; + + for (i = 0; i < BITS_TO_LONGS(MSC_CNT); i++) + r |= hidinput->input->mscbit[i]; + + for (i = 0; i < BITS_TO_LONGS(LED_CNT); i++) + r |= hidinput->input->ledbit[i]; + + for (i = 0; i < BITS_TO_LONGS(SND_CNT); i++) + r |= hidinput->input->sndbit[i]; + + for (i = 0; i < BITS_TO_LONGS(FF_CNT); i++) + r |= hidinput->input->ffbit[i]; + + for (i = 0; i < BITS_TO_LONGS(SW_CNT); i++) + r |= hidinput->input->swbit[i]; + + return !!r; +} + +static void hidinput_cleanup_hidinput(struct hid_device *hid, + struct hid_input *hidinput) +{ + struct hid_report *report; + int i, k; + + list_del(&hidinput->list); + input_free_device(hidinput->input); + + for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) { + if (k == HID_OUTPUT_REPORT && + hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORTS) + continue; + + list_for_each_entry(report, &hid->report_enum[k].report_list, + list) { + + for (i = 0; i < report->maxfield; i++) + if (report->field[i]->hidinput == hidinput) + report->field[i]->hidinput = NULL; + } + } + + kfree(hidinput); +} + /* * Register the input device; print a message. * Configure the input layer interface @@ -1249,6 +1310,10 @@ int hidinput_connect(struct hid_device *hid, unsigned int force) hidinput_configure_usage(hidinput, report->field[i], report->field[i]->usage + j); + if ((hid->quirks & HID_QUIRK_NO_EMPTY_INPUT) && + !hidinput_has_been_populated(hidinput)) + continue; + if (hid->quirks & HID_QUIRK_MULTI_INPUT) { /* This will leave hidinput NULL, so that it * allocates another one if we have more inputs on @@ -1265,6 +1330,18 @@ int hidinput_connect(struct hid_device *hid, unsigned int force) } } + if (hidinput && (hid->quirks & HID_QUIRK_NO_EMPTY_INPUT) && + !hidinput_has_been_populated(hidinput)) { + /* no need to register an input device not populated */ + hidinput_cleanup_hidinput(hid, hidinput); + hidinput = NULL; + } + + if (list_empty(&hid->inputs)) { + hid_err(hid, "No inputs registered, leaving\n"); + goto out_unwind; + } + if (hidinput) { if (drv->input_configured) drv->input_configured(hid, hidinput); diff --git a/include/linux/hid.h b/include/linux/hid.h index 863744c38ddc..fffa06bc4880 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -282,6 +282,7 @@ struct hid_item { #define HID_QUIRK_BADPAD 0x00000020 #define HID_QUIRK_MULTI_INPUT 0x00000040 #define HID_QUIRK_HIDINPUT_FORCE 0x00000080 +#define HID_QUIRK_NO_EMPTY_INPUT 0x00000100 #define HID_QUIRK_SKIP_OUTPUT_REPORTS 0x00010000 #define HID_QUIRK_FULLSPEED_INTERVAL 0x10000000 #define HID_QUIRK_NO_INIT_REPORTS 0x20000000 |