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HID: wiimote: convert BATTERY to module

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This introduces a new sub-device module for the BATTERY handlers. It
moves the whole power_supply battery handling over to wiimote-modules.

This doesn't change any semantics or ABI but only converts the battery
handling into a sub-device module.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
David Herrmann
2013-05-05 23:12:53 +02:00
committed by Jiri Kosina
parent 20cef813b4
commit dcf3923138
3 changed files with 104 additions and 76 deletions
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drivers/hid/hid-wiimote-modules.c
+98
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@@ -171,9 +171,107 @@ static const struct wiimod_ops wiimod_rumble = {
.remove = wiimod_rumble_remove,
};
/*
* Battery
* 1 byte of battery capacity information is sent along every protocol status
* report. The wiimote core caches it but we try to update it on every
* user-space request.
* This is supported by nearly every device so it's almost always enabled.
*/
static enum power_supply_property wiimod_battery_props[] = {
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_SCOPE,
};
static int wiimod_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;
if (psp == POWER_SUPPLY_PROP_SCOPE) {
val->intval = POWER_SUPPLY_SCOPE_DEVICE;
return 0;
} else if (psp != POWER_SUPPLY_PROP_CAPACITY) {
return -EINVAL;
}
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);
wiimote_cmd_wait(wdata);
wiimote_cmd_release(wdata);
spin_lock_irqsave(&wdata->state.lock, flags);
state = wdata->state.cmd_battery;
spin_unlock_irqrestore(&wdata->state.lock, flags);
val->intval = state * 100 / 255;
return ret;
}
static int wiimod_battery_probe(const struct wiimod_ops *ops,
struct wiimote_data *wdata)
{
int ret;
wdata->battery.properties = wiimod_battery_props;
wdata->battery.num_properties = ARRAY_SIZE(wiimod_battery_props);
wdata->battery.get_property = wiimod_battery_get_property;
wdata->battery.type = POWER_SUPPLY_TYPE_BATTERY;
wdata->battery.use_for_apm = 0;
wdata->battery.name = kasprintf(GFP_KERNEL, "wiimote_battery_%s",
wdata->hdev->uniq);
if (!wdata->battery.name)
return -ENOMEM;
ret = power_supply_register(&wdata->hdev->dev, &wdata->battery);
if (ret) {
hid_err(wdata->hdev, "cannot register battery device\n");
goto err_free;
}
power_supply_powers(&wdata->battery, &wdata->hdev->dev);
return 0;
err_free:
kfree(wdata->battery.name);
wdata->battery.name = NULL;
return ret;
}
static void wiimod_battery_remove(const struct wiimod_ops *ops,
struct wiimote_data *wdata)
{
if (!wdata->battery.name)
return;
power_supply_unregister(&wdata->battery);
kfree(wdata->battery.name);
wdata->battery.name = NULL;
}
static const struct wiimod_ops wiimod_battery = {
.flags = 0,
.arg = 0,
.probe = wiimod_battery_probe,
.remove = wiimod_battery_remove,
};
/* module table */
const struct wiimod_ops *wiimod_table[WIIMOD_NUM] = {
[WIIMOD_KEYS] = &wiimod_keys,
[WIIMOD_RUMBLE] = &wiimod_rumble,
[WIIMOD_BATTERY] = &wiimod_battery,
};