4.14-stable review patch. If anyone has any objections, please let me know.
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From: Aaron Armstrong Skomra aaron.skomra@wacom.com
commit 9ac6678b95b0dd9458a7a6869f46e51cd55a1d84 upstream.
Currently the EKR battery remains even after we stop getting information from the device. This can lead to a stale battery persisting indefinitely in userspace.
The remote sends a heartbeat every 10 seconds. Delete the battery if we miss two heartbeats (after 21 seconds). Restore the battery once we see a heartbeat again.
Signed-off-by: Aaron Skomra skomra@gmail.com Signed-off-by: Aaron Armstrong Skomra aaron.skomra@wacom.com Reviewed-by: Jason Gerecke jason.gerecke@wacom.com Fixes: 9f1015d45f62 ("HID: wacom: EKR: attach the power_supply on first connection") CC: stable@vger.kernel.org Signed-off-by: Jiri Kosina jkosina@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/hid/wacom.h | 1 + drivers/hid/wacom_sys.c | 25 +++++++++++++++++++++---- drivers/hid/wacom_wac.c | 1 + drivers/hid/wacom_wac.h | 1 + 4 files changed, 24 insertions(+), 4 deletions(-)
--- a/drivers/hid/wacom.h +++ b/drivers/hid/wacom.h @@ -155,6 +155,7 @@ struct wacom_remote { struct input_dev *input; bool registered; struct wacom_battery battery; + ktime_t active_time; } remotes[WACOM_MAX_REMOTES]; };
--- a/drivers/hid/wacom_sys.c +++ b/drivers/hid/wacom_sys.c @@ -2361,6 +2361,18 @@ fail: return; }
+static void wacom_remote_destroy_battery(struct wacom *wacom, int index) +{ + struct wacom_remote *remote = wacom->remote; + + if (remote->remotes[index].battery.battery) { + devres_release_group(&wacom->hdev->dev, + &remote->remotes[index].battery.bat_desc); + remote->remotes[index].battery.battery = NULL; + remote->remotes[index].active_time = 0; + } +} + static void wacom_remote_destroy_one(struct wacom *wacom, unsigned int index) { struct wacom_remote *remote = wacom->remote; @@ -2375,9 +2387,7 @@ static void wacom_remote_destroy_one(str remote->remotes[i].registered = false; spin_unlock_irqrestore(&remote->remote_lock, flags);
- if (remote->remotes[i].battery.battery) - devres_release_group(&wacom->hdev->dev, - &remote->remotes[i].battery.bat_desc); + wacom_remote_destroy_battery(wacom, i);
if (remote->remotes[i].group.name) devres_release_group(&wacom->hdev->dev, @@ -2385,7 +2395,6 @@ static void wacom_remote_destroy_one(str
remote->remotes[i].serial = 0; remote->remotes[i].group.name = NULL; - remote->remotes[i].battery.battery = NULL; wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN; } } @@ -2470,6 +2479,9 @@ static int wacom_remote_attach_battery(s if (remote->remotes[index].battery.battery) return 0;
+ if (!remote->remotes[index].active_time) + return 0; + if (wacom->led.groups[index].select == WACOM_STATUS_UNKNOWN) return 0;
@@ -2485,6 +2497,7 @@ static void wacom_remote_work(struct wor { struct wacom *wacom = container_of(work, struct wacom, remote_work); struct wacom_remote *remote = wacom->remote; + ktime_t kt = ktime_get(); struct wacom_remote_data data; unsigned long flags; unsigned int count; @@ -2511,6 +2524,10 @@ static void wacom_remote_work(struct wor serial = data.remote[i].serial; if (data.remote[i].connected) {
+ if (kt - remote->remotes[i].active_time > WACOM_REMOTE_BATTERY_TIMEOUT + && remote->remotes[i].active_time != 0) + wacom_remote_destroy_battery(wacom, i); + if (remote->remotes[i].serial == serial) { wacom_remote_attach_battery(wacom, i); continue; --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -1039,6 +1039,7 @@ static int wacom_remote_irq(struct wacom if (index < 0 || !remote->remotes[index].registered) goto out;
+ remote->remotes[i].active_time = ktime_get(); input = remote->remotes[index].input;
input_report_key(input, BTN_0, (data[9] & 0x01)); --- a/drivers/hid/wacom_wac.h +++ b/drivers/hid/wacom_wac.h @@ -18,6 +18,7 @@ #define WACOM_NAME_MAX 64 #define WACOM_MAX_REMOTES 5 #define WACOM_STATUS_UNKNOWN 255 +#define WACOM_REMOTE_BATTERY_TIMEOUT 21000000000ll
/* packet length for individual models */ #define WACOM_PKGLEN_BBFUN 9