HID: lg4ff - Add range setting support and sysfs interface

Wheel range of certain Logitech wheels - namely Driving Force GT, Driving Force
Pro, G25 and G27 can be adjusted. Minimu is 40 degrees, maximum 900. DFGT, G25
and G27 all use a common command, DFP uses another one.  Range can be set from
userspace by writing to
"/sys/module/hid_logitech/drivers/hid:logitech/<dev>range". The driver use list
to store range of each connected wheel; it's not possible to use driver_data in
hid_device struct as it's already b hig-lg driver.
Signed-off-by: Michal Malý <madcatxster@gmail.com>
Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-lg.c

@@ -406,6 +406,15 @@ static int lg_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	return ret;
 }
 
+static void lg_remove(struct hid_device *hdev)
+{
+	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
+	if(quirks & LG_FF4)
+		lg4ff_deinit(hdev);
+
+	hid_hw_stop(hdev);
+}
+
 static const struct hid_device_id lg_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER),
 		.driver_data = LG_RDESC | LG_WIRELESS },
@@ -481,6 +490,7 @@ static struct hid_driver lg_driver = {
 	.input_mapped = lg_input_mapped,
 	.event = lg_event,
 	.probe = lg_probe,
+	.remove = lg_remove,
 };
 
 static int __init lg_init(void)

drivers/hid/hid-lg.h

@@ -21,8 +21,10 @@ static inline int lg3ff_init(struct hid_device *hdev) { return -1; }
 
 #ifdef CONFIG_LOGIWII_FF
 int lg4ff_init(struct hid_device *hdev);
+int lg4ff_deinit(struct hid_device *hdev);
 #else
 static inline int lg4ff_init(struct hid_device *hdev) { return -1; }
+static inline int lg4ff_deinit(struct hid_device *hdev) { return -1; }
 #endif
 
 #endif