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From: "Michal Malý" <madcatxster@gmail.com>
To: jkosina@suse.cz
Cc: linux-input@vger.kernel.org, simon@mungewell.org
Subject: PATCH [4/6] HID: lg4ff - Add autocentering command accepted by Formula Force EX
Date: Sun, 31 Jul 2011 03:12:18 +0200	[thread overview]
Message-ID: <2586452.9LP0aaYiSl@qosmio-x300> (raw)

According to our USB traffic sniffs the Logitech driver for Windows sends Formula Force EX wheel a different command to set the 
autocenering force. FFEX will accept the standard command used by the rest of the wheels, but it won't set the centering force 
properly.

Signed-off-by: Michal Malý <madcatxster@gmail.com>
---
diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 1ee78d3..1ca121e 100644
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -157,7 +157,9 @@ static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *e
 	return 0;
 }
 
-static void hid_lg4ff_set_autocenter(struct input_dev *dev, u16 magnitude)
+/* Sends default autocentering command compatible with
+ * all wheels except Formula Force EX */
+static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
@@ -174,6 +176,26 @@ static void hid_lg4ff_set_autocenter(struct input_dev *dev, u16 magnitude)
 	usbhid_submit_report(hid, report, USB_DIR_OUT);
 }
 
+/* Sends autocentering command compatible with Formula Force EX */
+static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
+{
+	struct hid_device *hid = input_get_drvdata(dev);
+	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
+	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
+	magnitude = magnitude * 90 / 65535;
+	
+
+	report->field[0]->value[0] = 0xfe;
+	report->field[0]->value[1] = 0x03;
+	report->field[0]->value[2] = magnitude >> 14;
+	report->field[0]->value[3] = magnitude >> 14;
+	report->field[0]->value[4] = magnitude;
+	report->field[0]->value[5] = 0x00;
+	report->field[0]->value[6] = 0x00;
+
+	usbhid_submit_report(hid, report, USB_DIR_OUT);
+}
+
 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 {
@@ -390,8 +412,16 @@ int lg4ff_init(struct hid_device *hid)
 	if (error)
 		return error;
 
-	if (test_bit(FF_AUTOCENTER, dev->ffbit))
-		dev->ff->set_autocenter = hid_lg4ff_set_autocenter;
+	/* Check if autocentering is available and
+	 * set the centering force to zero by default */
+	if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
+		if(rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN)	/* Formula Force EX expects different autocentering 
command */
+			dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
+		else
+			dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;
+
+		dev->ff->set_autocenter(dev, 0);
+	}
 
 		/* Initialize device_list if this is the first device to handle by lg4ff */
 	if (!list_inited) {

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                 reply	other threads:[~2011-07-31  1:12 UTC|newest]

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