This registers a power_supply device for every remote to retrieve the current
battery charge level. Since this information is not sent by the wiimote
continously, we need to explicitely request it.
Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxxxxxxx>
---
drivers/hid/Kconfig | 1 +
drivers/hid/hid-wiimote.c | 60 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 61 insertions(+), 0 deletions(-)
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 1130a89..9907dc9 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -590,6 +590,7 @@ config HID_WIIMOTE
tristate "Nintendo Wii Remote support"
depends on BT_HIDP
depends on LEDS_CLASS
+ select POWER_SUPPLY
---help---
Support for the Nintendo Wii Remote bluetooth device.
diff --git a/drivers/hid/hid-wiimote.c b/drivers/hid/hid-wiimote.c
index 48198cb..c83cafa 100644
--- a/drivers/hid/hid-wiimote.c
+++ b/drivers/hid/hid-wiimote.c
@@ -17,6 +17,7 @@
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mutex.h>
+#include <linux/power_supply.h>
#include <linux/spinlock.h>
#include "hid-ids.h"
@@ -51,6 +52,7 @@ struct wiimote_data {
struct led_classdev *leds[4];
struct input_dev *accel;
struct input_dev *ir;
+ struct power_supply battery;
spinlock_t qlock;
__u8 head;
@@ -133,6 +135,10 @@ static __u16 wiiproto_keymap[] = {
BTN_MODE, /* WIIPROTO_KEY_HOME */
};
+static enum power_supply_property wiimote_battery_props[] = {
+ POWER_SUPPLY_PROP_CAPACITY
+};
+
/* requires the state.lock spinlock to be held */
static inline bool wiimote_cmd_pending(struct wiimote_data *wdata, int cmd,
__u32 opt)
@@ -453,6 +459,43 @@ static int wiimote_cmd_write(struct wiimote_data *wdata, __u32 offset,
return ret;
}
+static int wiimote_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct wiimote_data *wdata = container_of(psy,
+ struct wiimote_data, battery);
+ int ret = 0, state;
+ unsigned long flags;
+
+ ret = wiimote_cmd_acquire(wdata);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&wdata->state.lock, flags);
+ wiimote_cmd_set(wdata, WIIPROTO_REQ_SREQ, 0);
+ wiiproto_req_status(wdata);
+ spin_unlock_irqrestore(&wdata->state.lock, flags);
+
+ ret = wiimote_cmd_wait(wdata);
+ state = wdata->state.cmd_battery;
+ wiimote_cmd_release(wdata);
+
+ if (ret)
+ return ret;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = state * 100 / 255;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
static int wiimote_init_ir(struct wiimote_data *wdata, __u16 mode)
{
int ret;
@@ -1155,6 +1198,7 @@ static void wiimote_destroy(struct wiimote_data *wdata)
{
wiimote_leds_destroy(wdata);
+ power_supply_unregister(&wdata->battery);
input_unregister_device(wdata->accel);
input_unregister_device(wdata->ir);
input_unregister_device(wdata->input);
@@ -1206,6 +1250,19 @@ static int wiimote_hid_probe(struct hid_device *hdev,
goto err_input;
}
+ wdata->battery.properties = wiimote_battery_props;
+ wdata->battery.num_properties = ARRAY_SIZE(wiimote_battery_props);
+ wdata->battery.get_property = wiimote_battery_get_property;
+ wdata->battery.name = "wiimote_battery";
+ wdata->battery.type = POWER_SUPPLY_TYPE_BATTERY;
+ wdata->battery.use_for_apm = 0;
+
+ ret = power_supply_register(&wdata->hdev->dev, &wdata->battery);
+ if (ret) {
+ hid_err(hdev, "Cannot register battery device\n");
+ goto err_battery;
+ }
+
ret = wiimote_leds_create(wdata);
if (ret)
goto err_free;
@@ -1223,6 +1280,9 @@ err_free:
wiimote_destroy(wdata);
return ret;
+err_battery:
+ input_unregister_device(wdata->input);
+ wdata->input = NULL;
err_input:
input_unregister_device(wdata->ir);
wdata->ir = NULL;
--
1.7.6.1
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