HID: wacom: Force pen out of prox if no events have been received in a while

Prox-out events may not be reliably sent by some AES firmware. This can
cause problems for users, particularly due to arbitration logic disabling
touch input while the pen is in prox.

This commit adds a timer which is reset every time a new prox event is
received. When the timer expires we check to see if the pen is still in
prox and force it out if necessary. This is patterend off of the same
solution used by 'hid-letsketch' driver which has a similar problem.

Link: https://github.com/linuxwacom/input-wacom/issues/310
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/wacom.h b/drivers/hid/wacom.h
index 203d27d198b818a364c2614097fb62f3748f0d21..3f8b24a57014b954b0c841b7cf19b05c341e6d08 100644 (file)
--- a/drivers/hid/wacom.h
+++ b/drivers/hid/wacom.h
@@ -91,6 +91,7 @@
 #include <linux/leds.h>
 #include <linux/usb/input.h>
 #include <linux/power_supply.h>
+#include <linux/timer.h>
 #include <asm/unaligned.h>
 
 /*
@@ -167,6 +168,7 @@ struct wacom {
        struct delayed_work init_work;
        struct wacom_remote *remote;
        struct work_struct mode_change_work;
+       struct timer_list idleprox_timer;
        bool generic_has_leds;
        struct wacom_leds {
                struct wacom_group_leds *groups;
@@ -239,4 +241,5 @@ struct wacom_led *wacom_led_find(struct wacom *wacom, unsigned int group,
 struct wacom_led *wacom_led_next(struct wacom *wacom, struct wacom_led *cur);
 int wacom_equivalent_usage(int usage);
 int wacom_initialize_leds(struct wacom *wacom);
+void wacom_idleprox_timeout(struct timer_list *list);
 #endif

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 98384b911288e6e29d0425d2dcde9cea2f4ca5ea..194a2e32759148da8a2afeffb6683365f80e44d0 100644 (file)
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -2781,6 +2781,7 @@ static int wacom_probe(struct hid_device *hdev,
        INIT_WORK(&wacom->battery_work, wacom_battery_work);
        INIT_WORK(&wacom->remote_work, wacom_remote_work);
        INIT_WORK(&wacom->mode_change_work, wacom_mode_change_work);
+       timer_setup(&wacom->idleprox_timer, &wacom_idleprox_timeout, TIMER_DEFERRABLE);
 
        /* ask for the report descriptor to be loaded by HID */
        error = hid_parse(hdev);
@@ -2821,6 +2822,7 @@ static void wacom_remove(struct hid_device *hdev)
        cancel_work_sync(&wacom->battery_work);
        cancel_work_sync(&wacom->remote_work);
        cancel_work_sync(&wacom->mode_change_work);
+       del_timer_sync(&wacom->idleprox_timer);
        if (hdev->bus == BUS_BLUETOOTH)
                device_remove_file(&hdev->dev, &dev_attr_speed);
 

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index f8cc4bb3e3a724c2b19f537e0c79df1474bbd87d..d049239256a268b467c6fe565f3a516d2d609ab1 100644 (file)
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -11,6 +11,7 @@
 #include "wacom_wac.h"
 #include "wacom.h"
 #include <linux/input/mt.h>
+#include <linux/jiffies.h>
 
 /* resolution for penabled devices */
 #define WACOM_PL_RES           20
@@ -41,6 +42,43 @@ static int wacom_numbered_button_to_key(int n);
 
 static void wacom_update_led(struct wacom *wacom, int button_count, int mask,
                             int group);
+
+static void wacom_force_proxout(struct wacom_wac *wacom_wac)
+{
+       struct input_dev *input = wacom_wac->pen_input;
+
+       wacom_wac->shared->stylus_in_proximity = 0;
+
+       input_report_key(input, BTN_TOUCH, 0);
+       input_report_key(input, BTN_STYLUS, 0);
+       input_report_key(input, BTN_STYLUS2, 0);
+       input_report_key(input, BTN_STYLUS3, 0);
+       input_report_key(input, wacom_wac->tool[0], 0);
+       if (wacom_wac->serial[0]) {
+               input_report_abs(input, ABS_MISC, 0);
+       }
+       input_report_abs(input, ABS_PRESSURE, 0);
+
+       wacom_wac->tool[0] = 0;
+       wacom_wac->id[0] = 0;
+       wacom_wac->serial[0] = 0;
+
+       input_sync(input);
+}
+
+void wacom_idleprox_timeout(struct timer_list *list)
+{
+       struct wacom *wacom = from_timer(wacom, list, idleprox_timer);
+       struct wacom_wac *wacom_wac = &wacom->wacom_wac;
+
+       if (!wacom_wac->hid_data.sense_state) {
+               return;
+       }
+
+       hid_warn(wacom->hdev, "%s: tool appears to be hung in-prox. forcing it out.\n", __func__);
+       wacom_force_proxout(wacom_wac);
+}
+
 /*
  * Percent of battery capacity for Graphire.
  * 8th value means AC online and show 100% capacity.
@@ -2329,6 +2367,7 @@ static void wacom_wac_pen_event(struct hid_device *hdev, struct hid_field *field
                value = field->logical_maximum - value;
                break;
        case HID_DG_INRANGE:
+               mod_timer(&wacom->idleprox_timer, jiffies + msecs_to_jiffies(100));
                wacom_wac->hid_data.inrange_state = value;
                if (!(features->quirks & WACOM_QUIRK_SENSE))
                        wacom_wac->hid_data.sense_state = value;