HID: lg4ff - Add autocentering command accepted by Formula Force EX

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

Signed-off-by: Michal Malý <madcatxster@gmail.com>
Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 33 insertions, 3 deletions

diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 5c9eef2267e..dc38c2d89df 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) {