Input: wacom - get features from driver info

Get the features information from the driver info of the usb device id
structure provided by the caller. The device ids and feature structs
are strong coupled using indices.
Signed-off-by: Bastian Blank <waldi@debian.org>
Tested-by: Jason Childs <oblivian@users.sourceforge.net>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/tablet/wacom.h

@@ -85,6 +85,7 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/mod_devicetable.h>
 #include <linux/init.h>
 #include <linux/usb/input.h>
 #include <asm/unaligned.h>
@@ -120,6 +121,8 @@ struct wacom_combo {
 	struct urb *urb;
 };
 
+extern const struct usb_device_id wacom_ids[];
+
 extern int wacom_wac_irq(struct wacom_wac * wacom_wac, void * wcombo);
 extern void wacom_report_abs(void *wcombo, unsigned int abs_type, int abs_data);
 extern void wacom_report_rel(void *wcombo, unsigned int rel_type, int rel_data);
@@ -142,7 +145,5 @@ extern void input_dev_mo(struct input_dev *input_dev, struct wacom_wac *wacom_wa
 extern void input_dev_bee(struct input_dev *input_dev, struct wacom_wac *wacom_wac);
 extern __u16 wacom_le16_to_cpu(unsigned char *data);
 extern __u16 wacom_be16_to_cpu(unsigned char *data);
-extern struct wacom_features *get_wacom_feature(const struct usb_device_id *id);
-extern const struct usb_device_id *get_device_table(void);
 
 #endif

drivers/input/tablet/wacom_sys.c

@@ -530,10 +530,13 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i
 	struct usb_endpoint_descriptor *endpoint;
 	struct wacom *wacom;
 	struct wacom_wac *wacom_wac;
-	struct wacom_features *features;
+	struct wacom_features *features = (void *)id->driver_info;
 	struct input_dev *input_dev;
 	int error = -ENOMEM;
 
+	if (!features)
+		return -EINVAL;
+
 	wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
 	wacom_wac = kzalloc(sizeof(struct wacom_wac), GFP_KERNEL);
 	input_dev = input_allocate_device();
@@ -555,7 +558,7 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i
 	usb_make_path(dev, wacom->phys, sizeof(wacom->phys));
 	strlcat(wacom->phys, "/input0", sizeof(wacom->phys));
 
-	wacom_wac->features = features = get_wacom_feature(id);
+	wacom_wac->features = features;
 	BUG_ON(features->pktlen > WACOM_PKGLEN_MAX);
 
 	input_dev->name = wacom_wac->features->name;
@@ -663,6 +666,7 @@ static int wacom_reset_resume(struct usb_interface *intf)
 
 static struct usb_driver wacom_driver = {
 	.name =		"wacom",
+	.id_table =	wacom_ids,
 	.probe =	wacom_probe,
 	.disconnect =	wacom_disconnect,
 	.suspend =	wacom_suspend,
@@ -674,7 +678,7 @@ static struct usb_driver wacom_driver = {
 static int __init wacom_init(void)
 {
 	int result;
-	wacom_driver.id_table = get_device_table();
+
 	result = usb_register(&wacom_driver);
 	if (result == 0)
 		printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"