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Subject[PATCH 5.4 22/98] HID: ite: Replace ABS_MISC 120/121 events with touchpad on/off keypresses
Date
From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 3c785a06dee99501a17f8e8cf29b2b7e3f1e94ea ]

The usb-hid keyboard-dock for the Acer Switch 10 SW5-012 model declares
an application and hid-usage page of 0x0088 for the INPUT(4) report which
it sends. This reports contains 2 8-bit fields which are declared as
HID_MAIN_ITEM_VARIABLE.

The keyboard-touchpad combo never actually generates this report, except
when the touchpad is toggled on/off with the Fn + F7 hotkey combo. The
toggle on/off is handled inside the keyboard-dock, when the touchpad is
toggled off it simply stops sending events.

When the touchpad is toggled on/off an INPUT(4) report is generated with
the first content byte set to 120/121, before this commit the kernel
would report this as ABS_MISC 120/121 events.

Patch the descriptor to replace the HID_MAIN_ITEM_VARIABLE with
HID_MAIN_ITEM_RELATIVE (because no key-presss release events are send)
and add mappings for the 0x00880078 and 0x00880079 usages to generate
touchpad on/off key events when the touchpad is toggled on/off.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/hid/hid-ite.c | 61 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 60 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-ite.c b/drivers/hid/hid-ite.c
index 044a93f3c1178..742c052b0110a 100644
--- a/drivers/hid/hid-ite.c
+++ b/drivers/hid/hid-ite.c
@@ -11,6 +11,48 @@

#include "hid-ids.h"

+#define QUIRK_TOUCHPAD_ON_OFF_REPORT BIT(0)
+
+static __u8 *ite_report_fixup(struct hid_device *hdev, __u8 *rdesc, unsigned int *rsize)
+{
+ unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
+
+ if (quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) {
+ if (*rsize == 188 && rdesc[162] == 0x81 && rdesc[163] == 0x02) {
+ hid_info(hdev, "Fixing up ITE keyboard report descriptor\n");
+ rdesc[163] = HID_MAIN_ITEM_RELATIVE;
+ }
+ }
+
+ return rdesc;
+}
+
+static int ite_input_mapping(struct hid_device *hdev,
+ struct hid_input *hi, struct hid_field *field,
+ struct hid_usage *usage, unsigned long **bit,
+ int *max)
+{
+
+ unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
+
+ if ((quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) &&
+ (usage->hid & HID_USAGE_PAGE) == 0x00880000) {
+ if (usage->hid == 0x00880078) {
+ /* Touchpad on, userspace expects F22 for this */
+ hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F22);
+ return 1;
+ }
+ if (usage->hid == 0x00880079) {
+ /* Touchpad off, userspace expects F23 for this */
+ hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F23);
+ return 1;
+ }
+ return -1;
+ }
+
+ return 0;
+}
+
static int ite_event(struct hid_device *hdev, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
@@ -37,13 +79,27 @@ static int ite_event(struct hid_device *hdev, struct hid_field *field,
return 0;
}

+static int ite_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+ int ret;
+
+ hid_set_drvdata(hdev, (void *)id->driver_data);
+
+ ret = hid_open_report(hdev);
+ if (ret)
+ return ret;
+
+ return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+}
+
static const struct hid_device_id ite_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
{ HID_USB_DEVICE(USB_VENDOR_ID_258A, USB_DEVICE_ID_258A_6A88) },
/* ITE8595 USB kbd ctlr, with Synaptics touchpad connected to it. */
{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
USB_VENDOR_ID_SYNAPTICS,
- USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_012) },
+ USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_012),
+ .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
/* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
USB_VENDOR_ID_SYNAPTICS,
@@ -55,6 +111,9 @@ MODULE_DEVICE_TABLE(hid, ite_devices);
static struct hid_driver ite_driver = {
.name = "itetech",
.id_table = ite_devices,
+ .probe = ite_probe,
+ .report_fixup = ite_report_fixup,
+ .input_mapping = ite_input_mapping,
.event = ite_event,
};
module_hid_driver(ite_driver);
--
2.27.0


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