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HID: wiimote: Add extension sysfs attribute 

Add new sysfs attribute "extension" which returns the currently connected and
initialized extensions.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
David Herrmann 2011-11-17 14:12:04 +01:00 committed by Jiri Kosina
parent 492ba955c1
commit c1e51398a1
2 changed files with 58 additions and 0 deletions
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12
Documentation/ABI/testing/sysfs-driver-hid-wiimote
View File

@ -8,3 +8,15 @@ Contact: David Herrmann <dh.herrmann@googlemail.com>
Description: Make it possible to set/get current led state. Reading from it
returns 0 if led is off and 1 if it is on. Writing 0 to it
disables the led, writing 1 enables it.
What: /sys/bus/hid/drivers/wiimote/<dev>/extension
Date: August 2011
KernelVersion: 3.2
Contact: David Herrmann <dh.herrmann@googlemail.com>
Description: This file contains the currently connected and initialized
extensions. It can be one of: none, motionp, nunchuck, classic,
motionp+nunchuck, motionp+classic
motionp is the official Nintendo Motion+ extension, nunchuck is
the official Nintendo Nunchuck extension and classic is the
Nintendo Classic Controller extension. The motionp extension can
be combined with the other two.

46
drivers/hid/hid-wiimote-ext.c
View File

@ -199,11 +199,47 @@ bool wiiext_active(struct wiimote_data *wdata)
return wdata->ext->motionp || wdata->ext->ext_type;
}
static ssize_t wiiext_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct wiimote_data *wdata = dev_to_wii(dev);
__u8 type = WIIEXT_NONE;
bool motionp = false;
unsigned long flags;
spin_lock_irqsave(&wdata->state.lock, flags);
if (wdata->ext) {
motionp = wdata->ext->motionp;
type = wdata->ext->ext_type;
}
spin_unlock_irqrestore(&wdata->state.lock, flags);
if (type == WIIEXT_NUNCHUCK) {
if (motionp)
return sprintf(buf, "motionp+nunchuck\n");
else
return sprintf(buf, "nunchuck\n");
} else if (type == WIIEXT_CLASSIC) {
if (motionp)
return sprintf(buf, "motionp+classic\n");
else
return sprintf(buf, "classic\n");
} else {
if (motionp)
return sprintf(buf, "motionp\n");
else
return sprintf(buf, "none\n");
}
}
static DEVICE_ATTR(extension, S_IRUGO, wiiext_show, NULL);
/* Initializes the extension driver of a wiimote */
int wiiext_init(struct wiimote_data *wdata)
{
struct wiimote_ext *ext;
unsigned long flags;
int ret;
ext = kzalloc(sizeof(*ext), GFP_KERNEL);
if (!ext)
@ -212,11 +248,19 @@ int wiiext_init(struct wiimote_data *wdata)
ext->wdata = wdata;
INIT_WORK(&ext->worker, wiiext_worker);
ret = device_create_file(&wdata->hdev->dev, &dev_attr_extension);
if (ret)
goto err;
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->ext = ext;
spin_unlock_irqrestore(&wdata->state.lock, flags);
return 0;
err:
kfree(ext);
return ret;
}
/* Deinitializes the extension driver of a wiimote */
@ -240,6 +284,8 @@ void wiiext_deinit(struct wiimote_data *wdata)
wdata->ext = NULL;
spin_unlock_irqrestore(&wdata->state.lock, flags);
device_remove_file(&wdata->hdev->dev, &dev_attr_extension);
cancel_work_sync(&ext->worker);
kfree(ext);
}