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HID: wacom: Allow dynamic battery creation/destruction 

Tablets like the Intuos, Intuos Pro, and Bamboo have a connector for an
optional wireless module that can be connected on the fly. The presence
(or absence) of this module is indicated in a status report recieved
from the tablet. This patch adds a workqueue function that will create
or destroy a power_supply object at runtime to match the current state
of the WACOM_QUIRK_BATTERY flag.

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jason Gerecke 2015-03-06 11:47:40 -08:00 committed by Jiri Kosina
parent 953f2c5f71
commit fce9957d8f
2 changed files with 16 additions and 2 deletions
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1
drivers/hid/wacom.h
View File

@ -142,4 +142,5 @@ void wacom_wac_usage_mapping(struct hid_device *hdev,
int wacom_wac_event(struct hid_device *hdev, struct hid_field *field,
struct hid_usage *usage, __s32 value);
void wacom_wac_report(struct hid_device *hdev, struct hid_report *report);
void wacom_battery_work(struct work_struct *work);
#endif

17
drivers/hid/wacom_sys.c
View File

@ -1057,8 +1057,7 @@ static int wacom_initialize_battery(struct wacom *wacom)
static void wacom_destroy_battery(struct wacom *wacom)
{
if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
wacom->battery.dev) {
if (wacom->battery.dev) {
power_supply_unregister(&wacom->battery);
wacom->battery.dev = NULL;
power_supply_unregister(&wacom->ac);
@ -1329,6 +1328,20 @@ static void wacom_wireless_work(struct work_struct *work)
return;
}
void wacom_battery_work(struct work_struct *work)
{
struct wacom *wacom = container_of(work, struct wacom, work);
if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
!wacom->battery.dev) {
wacom_initialize_battery(wacom);
}
else if (!(wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
wacom->battery.dev) {
wacom_destroy_battery(wacom);
}
}
/*
* Not all devices report physical dimensions from HID.
* Compute the default from hardcoded logical dimension