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>

diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 5c9eef2267ed7e21cf0cc0d53e6ab478ae378bfa..dc38c2d89df1eb2614fa87efac3cdcaffda6c761 100644 (file)
--- 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) {