linux-kernel - [PATCH 3/4] HID: Introduce a module parameter to disable automatic switch of Logitech gaming wheels from compatibility to native mode. This only applies to multimode wheels.

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Message-Id: <1423240486-6714-4-git-send-email-madcatxster@devoid-pointer.net>
Date:	Fri,  6 Feb 2015 17:34:45 +0100
From:	Michal Malý <madcatxster@...oid-pointer.net>
To:	jkosina@...e.cz, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	simon@...gewell.org, elias.vds@...il.com,
	Michal Malý <madcatxster@...oid-pointer.net>
Subject: [PATCH 3/4] HID: Introduce a module parameter to disable automatic switch of Logitech gaming wheels from compatibility to native mode. This only applies to multimode wheels.

Introduce a module parameter to disable automatic switch of Logitech gaming
wheels from compatibility to native mode. This only applies to multimode wheels.

Signed-off-by: Michal Malý <madcatxster@...oid-pointer.net> 
---
 drivers/hid/hid-lg.c    | 6 ++++++
 drivers/hid/hid-lg4ff.c | 4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-lg.c b/drivers/hid/hid-lg.c
index f91ff14..8dae03f 100644
--- a/drivers/hid/hid-lg.c
+++ b/drivers/hid/hid-lg.c
@@ -818,4 +818,10 @@ static struct hid_driver lg_driver = {
 };
 module_hid_driver(lg_driver);
 
+#ifdef CONFIG_LOGIWHEELS_FF
+extern int lg4ff_no_autoswitch; /* From hid-lg4ff.c */
+module_param_named(lg4ff_no_autoswitch, lg4ff_no_autoswitch, int, S_IRUGO);
+MODULE_PARM_DESC(lg4ff_no_autoswitch, "Do not switch multimode wheels to their native mode automatically");
+#endif
+
 MODULE_LICENSE("GPL");
diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index b9c9fe6..cbb000a 100644
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -67,6 +67,7 @@
 #define LG4FF_FFEX_REV_MAJ 0x21
 #define LG4FF_FFEX_REV_MIN 0x00
 
+int lg4ff_no_autoswitch = 0;
 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
 static ssize_t lg4ff_alternate_modes_show(struct device *dev, struct device_attribute *attr, char *buf);
@@ -808,7 +809,8 @@ int lg4ff_handle_multimode_wheel(struct hid_device *hid, u16 *real_product_id, c
 	/* Switch from "Driving Force" mode to native mode automatically.
 	 * Otherwise keep the wheel in its current mode */
 	if (reported_product_id == USB_DEVICE_ID_LOGITECH_WHEEL &&
-	    reported_product_id != *real_product_id) {
+	    reported_product_id != *real_product_id &&
+	    !lg4ff_no_autoswitch) {
 		const struct lg4ff_compat_mode_switch *s;
 
 		switch (*real_product_id) {
-- 
2.2.2

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