1 files changed, 89 insertions, 0 deletions

diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 1fcb2da32785..8eb938d7aa02 100644
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -31,6 +31,17 @@
 #include "hid-lg.h"
 #include "hid-ids.h"
 
+#define DFGT_REV_MAJ 0x13
+#define DFGT_REV_MIN 0x22
+#define DFP_REV_MAJ 0x11
+#define DFP_REV_MIN 0x06
+#define FFEX_REV_MAJ 0x21
+#define FFEX_REV_MIN 0x00
+#define G25_REV_MAJ 0x12
+#define G25_REV_MIN 0x22
+#define G27_REV_MAJ 0x12
+#define G27_REV_MIN 0x38
+
 static const signed short lg4ff_wheel_effects[] = {
         FF_CONSTANT,
         FF_AUTOCENTER,
@@ -55,6 +66,46 @@ static const struct lg4ff_wheel lg4ff_devices[] = {
         {USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270}
 };
 
+struct lg4ff_native_cmd {
+        const __u8 cmd_num;     /* Number of commands to send */
+        const __u8 cmd[];
+};
+
+struct lg4ff_usb_revision {
+        const __u16 rev_maj;
+        const __u16 rev_min;
+        const struct lg4ff_native_cmd *command;
+};
+
+static const struct lg4ff_native_cmd native_dfp = {
+        1,
+        {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
+};
+
+static const struct lg4ff_native_cmd native_dfgt = {
+        2,
+        {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
+         0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
+};
+
+static const struct lg4ff_native_cmd native_g25 = {
+        1,
+        {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
+};
+
+static const struct lg4ff_native_cmd native_g27 = {
+        2,
+        {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
+         0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
+};
+
+static const struct lg4ff_usb_revision lg4ff_revs[] = {
+        {DFGT_REV_MAJ, DFGT_REV_MIN, &native_dfgt},     /* Driving Force GT */
+        {DFP_REV_MAJ,  DFP_REV_MIN,  &native_dfp},      /* Driving Force Pro */
+        {G25_REV_MAJ,  G25_REV_MIN,  &native_g25},      /* G25 */
+        {G27_REV_MAJ,  G27_REV_MIN,  &native_g27},      /* G27 */
+};
+
 static int hid_lg4ff_play(struct input_dev *dev, void *data,
                          struct ff_effect *effect)
 {
@@ -100,6 +151,20 @@ static void hid_lg4ff_set_autocenter(struct input_dev *dev, u16 magnitude)
         usbhid_submit_report(hid, report, USB_DIR_OUT);
 }
 
+static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
+{
+        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);
+        __u8 i, j;
+
+        j = 0;
+        while (j < 7*cmd->cmd_num) {
+                for (i = 0; i < 7; i++)
+                        report->field[0]->value[i] = cmd->cmd[j++];
+
+                usbhid_submit_report(hid, report, USB_DIR_OUT);
+        }
+}
 
 int lg4ff_init(struct hid_device *hid)
 {
@@ -108,7 +173,9 @@ int lg4ff_init(struct hid_device *hid)
         struct input_dev *dev = hidinput->input;
         struct hid_report *report;
         struct hid_field *field;
+        struct usb_device_descriptor *udesc = 0;
         int error, i, j;
+        __u16 bcdDevice, rev_maj, rev_min;
 
         /* Find the report to use */
         if (list_empty(report_list)) {
@@ -143,6 +210,28 @@ int lg4ff_init(struct hid_device *hid)
                 return -1;
         }
 
+        /* Attempt to switch wheel to native mode when applicable */
+        udesc = &(hid_to_usb_dev(hid)->descriptor);
+        if (!udesc) {
+                hid_err(hid, "NULL USB device descriptor\n");
+                return -1;
+        }
+        bcdDevice = le16_to_cpu(udesc->bcdDevice);
+        rev_maj = bcdDevice >> 8;
+        rev_min = bcdDevice & 0xff;
+
+        if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
+                dbg_hid("Generic wheel detected, can it do native?\n");
+                dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);
+
+                for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
+                        if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
+                                hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
+                                hid_info(hid, "Switched to native mode\n");
+                        }
+                }
+        }
+
         /* Set supported force feedback capabilities */
         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);