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Message-Id: <20210327130508.24849-4-johnchen902@gmail.com>
Date: Sat, 27 Mar 2021 21:05:07 +0800
From: John Chen <johnchen902@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Rohit Pidaparthi <rohitpid@...il.com>,
RicardoEPRodrigues <ricardo.e.p.rodrigues@...il.com>,
Jiri Kosina <jikos@...nel.org>,
Benjamin Tissoires <benjamin.tissoires@...hat.com>,
John Chen <johnchen902@...il.com>
Subject: [PATCH 3/4] HID: magicmouse: fix reconnection of Magic Mouse 2
It is observed that the Magic Mouse 2 would not enter multi-touch mode
unless the mouse is connected before loading the module. It seems to be
a quirk specific to Magic Mouse 2
Retrying after 500ms fixes the problem for me. The delay can't be
reduced much further --- 300ms didn't work for me. Retrying immediately
after receiving an event didn't work either.
Signed-off-by: John Chen <johnchen902@...il.com>
---
drivers/hid/hid-magicmouse.c | 93 ++++++++++++++++++++++++------------
1 file changed, 63 insertions(+), 30 deletions(-)
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index c646b4cd3783..69aefef9fe07 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -16,6 +16,7 @@
#include <linux/input/mt.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/workqueue.h>
#include "hid-ids.h"
@@ -128,6 +129,9 @@ struct magicmouse_sc {
u8 size;
} touches[16];
int tracking_ids[16];
+
+ struct hid_device *hdev;
+ struct delayed_work work;
};
static int magicmouse_firm_touch(struct magicmouse_sc *msc)
@@ -629,9 +633,7 @@ static int magicmouse_input_configured(struct hid_device *hdev,
return 0;
}
-
-static int magicmouse_probe(struct hid_device *hdev,
- const struct hid_device_id *id)
+static int magicmouse_enable_multitouch(struct hid_device *hdev)
{
const u8 *feature;
const u8 feature_mt[] = { 0xD7, 0x01 };
@@ -639,10 +641,52 @@ static int magicmouse_probe(struct hid_device *hdev,
const u8 feature_mt_trackpad2_usb[] = { 0x02, 0x01 };
const u8 feature_mt_trackpad2_bt[] = { 0xF1, 0x02, 0x01 };
u8 *buf;
+ int ret;
+ int feature_size;
+
+ if (hdev->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
+ if (hdev->vendor == BT_VENDOR_ID_APPLE) {
+ feature_size = sizeof(feature_mt_trackpad2_bt);
+ feature = feature_mt_trackpad2_bt;
+ } else { /* USB_VENDOR_ID_APPLE */
+ feature_size = sizeof(feature_mt_trackpad2_usb);
+ feature = feature_mt_trackpad2_usb;
+ }
+ } else if (hdev->product == USB_DEVICE_ID_APPLE_MAGICMOUSE2) {
+ feature_size = sizeof(feature_mt_mouse2);
+ feature = feature_mt_mouse2;
+ } else {
+ feature_size = sizeof(feature_mt);
+ feature = feature_mt;
+ }
+
+ buf = kmemdup(feature, feature_size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = hid_hw_raw_request(hdev, buf[0], buf, feature_size,
+ HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+ kfree(buf);
+ return ret;
+}
+
+static void magicmouse_enable_mt_work(struct work_struct *work)
+{
+ struct magicmouse_sc *msc =
+ container_of(work, struct magicmouse_sc, work.work);
+ int ret;
+
+ ret = magicmouse_enable_multitouch(msc->hdev);
+ if (ret < 0)
+ hid_err(msc->hdev, "unable to request touch data (%d)\n", ret);
+}
+
+static int magicmouse_probe(struct hid_device *hdev,
+ const struct hid_device_id *id)
+{
struct magicmouse_sc *msc;
struct hid_report *report;
int ret;
- int feature_size;
if (id->vendor == USB_VENDOR_ID_APPLE &&
id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 &&
@@ -656,6 +700,8 @@ static int magicmouse_probe(struct hid_device *hdev,
}
msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
+ msc->hdev = hdev;
+ INIT_DEFERRABLE_WORK(&msc->work, magicmouse_enable_mt_work);
msc->quirks = id->driver_data;
hid_set_drvdata(hdev, msc);
@@ -705,28 +751,6 @@ static int magicmouse_probe(struct hid_device *hdev,
}
report->size = 6;
- if (id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
- if (id->vendor == BT_VENDOR_ID_APPLE) {
- feature_size = sizeof(feature_mt_trackpad2_bt);
- feature = feature_mt_trackpad2_bt;
- } else { /* USB_VENDOR_ID_APPLE */
- feature_size = sizeof(feature_mt_trackpad2_usb);
- feature = feature_mt_trackpad2_usb;
- }
- } else if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE2) {
- feature_size = sizeof(feature_mt_mouse2);
- feature = feature_mt_mouse2;
- } else {
- feature_size = sizeof(feature_mt);
- feature = feature_mt;
- }
-
- buf = kmemdup(feature, feature_size, GFP_KERNEL);
- if (!buf) {
- ret = -ENOMEM;
- goto err_stop_hw;
- }
-
/*
* Some devices repond with 'invalid report id' when feature
* report switching it into multitouch mode is sent to it.
@@ -735,13 +759,14 @@ static int magicmouse_probe(struct hid_device *hdev,
* but there seems to be no other way of switching the mode.
* Thus the super-ugly hacky success check below.
*/
- ret = hid_hw_raw_request(hdev, buf[0], buf, feature_size,
- HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
- kfree(buf);
- if (ret != -EIO && ret != feature_size) {
+ ret = magicmouse_enable_multitouch(hdev);
+ if (ret != -EIO && ret < 0) {
hid_err(hdev, "unable to request touch data (%d)\n", ret);
goto err_stop_hw;
}
+ if (ret == -EIO && id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE2) {
+ schedule_delayed_work(&msc->work, msecs_to_jiffies(500));
+ }
return 0;
err_stop_hw:
@@ -749,6 +774,13 @@ static int magicmouse_probe(struct hid_device *hdev,
return ret;
}
+static void magicmouse_remove(struct hid_device *hdev)
+{
+ struct magicmouse_sc *msc = hid_get_drvdata(hdev);
+ cancel_delayed_work_sync(&msc->work);
+ hid_hw_stop(hdev);
+}
+
static const struct hid_device_id magic_mice[] = {
{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
USB_DEVICE_ID_APPLE_MAGICMOUSE), .driver_data = 0 },
@@ -768,6 +800,7 @@ static struct hid_driver magicmouse_driver = {
.name = "magicmouse",
.id_table = magic_mice,
.probe = magicmouse_probe,
+ .remove = magicmouse_remove,
.raw_event = magicmouse_raw_event,
.event = magicmouse_event,
.input_mapping = magicmouse_input_mapping,
--
2.31.0
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