HID: lg4ff - Move handling of Logitech wheels to lg4ff driver

This is the first out of five patches me and Simon Wood (CC'd) have been
working on. It separates the handling of Logite from the generic lgff driver
and adds additional features specific for the Logitech wheels, namely

- Native mode support for Driving Force GT, Driving Force Pro, G25 and G27
wheels Every Logitech wheel reports itself as generic Logitech Driving Force
wheel (VID 046d, PID c294). This is done to ensu wheel will work on every USB
HID-aware system even when no Logitech driver is available. It however limits
the capabilit wheel - range is limited to 200 degrees, G25/G27 don't report the
clutch pedal and there is only one combined axis for t brake. The switch to
native mode is done via hardware-specific command which is different for each
wheel. When the wheel receives such command, it simulates reconnect and reports
to the OS with its actual PID.

- Adjustable wheel range DFGT, DFP, G25 and G27 have variable range of the
steering wheel. The range is limited by applying a maximum constant when the
wheel is turned beyond the allowed range. The limit as also set by a
hardware-specific command. There is a comm command for DFGT, G25 and G27 and
another one for DFP. It is probably possible to use the DFP command to limit
the range other Logitech wheels too, but this is not supported by the official
Logitech driver for Windows.  The patch adds a sysfs interface which allows for
the range to be set from userspace.

- Fixed autocentering command All Logitech wheels support FF_AUTOCENTER effect.
The original implementation in the lgff driver didn't work well with patch
fixes it. According to USB communication sniffs the Formula Force EX (pretty
much rebranded original Driving Force accept the generic autocentering command,
this issue is also addressed by the patch

There are still some features this patch doesn't cover, but since some of them
will most likely require modifications of memless driver we have decided not to
include them yet.

As first we decided to move the handling of Logitech wheels from hid-lgff
driver to hid-lg4ff driver (originally used fo At also adds PID of Logitech
Driving Force GT.

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, 48 insertions, 22 deletions

diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index fa550c8e1d1b..1fcb2da32785 100644
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -29,17 +29,32 @@
 
 #include "usbhid/usbhid.h"
 #include "hid-lg.h"
+#include "hid-ids.h"
 
-struct lg4ff_device {
-        struct hid_report *report;
-};
-
-static const signed short ff4_wheel_ac[] = {
+static const signed short lg4ff_wheel_effects[] = {
         FF_CONSTANT,
         FF_AUTOCENTER,
         -1
 };
 
+struct lg4ff_wheel {
+        const __u32 product_id;
+        const signed short *ff_effects;
+        const __u16 min_range;
+        const __u16 max_range;
+};
+
+static const struct lg4ff_wheel lg4ff_devices[] = {
+        {USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270},
+        {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270},
+        {USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900},
+        {USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900},
+        {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900},
+        {USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900},
+        {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270},
+        {USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270}
+};
+
 static int hid_lg4ff_play(struct input_dev *dev, void *data,
                          struct ff_effect *effect)
 {
@@ -55,13 +70,12 @@ static int hid_lg4ff_play(struct input_dev *dev, void *data,
                 x = effect->u.ramp.start_level + 0x80;  /* 0x80 is no force */
                 CLAMP(x);
                 report->field[0]->value[0] = 0x11;      /* Slot 1 */
-                report->field[0]->value[1] = 0x10;
+                report->field[0]->value[1] = 0x08;
                 report->field[0]->value[2] = x;
-                report->field[0]->value[3] = 0x00;
+                report->field[0]->value[3] = 0x80;
                 report->field[0]->value[4] = 0x00;
-                report->field[0]->value[5] = 0x08;
+                report->field[0]->value[5] = 0x00;
                 report->field[0]->value[6] = 0x00;
-                dbg_hid("Autocenter, x=0x%02X\n", x);
 
                 usbhid_submit_report(hid, report, USB_DIR_OUT);
                 break;
@@ -74,15 +88,14 @@ static void hid_lg4ff_set_autocenter(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);
-        __s32 *value = report->field[0]->value;
 
-        *value++ = 0xfe;
-        *value++ = 0x0d;
-        *value++ = 0x07;
-        *value++ = 0x07;
-        *value++ = (magnitude >> 8) & 0xff;
-        *value++ = 0x00;
-        *value = 0x00;
+        report->field[0]->value[0] = 0xfe;
+        report->field[0]->value[1] = 0x0d;
+        report->field[0]->value[2] = magnitude >> 13;
+        report->field[0]->value[3] = magnitude >> 13;
+        report->field[0]->value[4] = magnitude >> 8;
+        report->field[0]->value[5] = 0x00;
+        report->field[0]->value[6] = 0x00;
 
         usbhid_submit_report(hid, report, USB_DIR_OUT);
 }
@@ -95,9 +108,7 @@ int lg4ff_init(struct hid_device *hid)
         struct input_dev *dev = hidinput->input;
         struct hid_report *report;
         struct hid_field *field;
-        const signed short *ff_bits = ff4_wheel_ac;
-        int error;
-        int i;
+        int error, i, j;
 
         /* Find the report to use */
         if (list_empty(report_list)) {
@@ -117,9 +128,24 @@ int lg4ff_init(struct hid_device *hid)
                 hid_err(hid, "NULL field\n");
                 return -1;
         }
+        
+        /* Check what wheel has been connected */
+        for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
+                if (hid->product == lg4ff_devices[i].product_id) {
+                        dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
+                        break;
+                }
+        }
+
+        if (i == ARRAY_SIZE(lg4ff_devices)) {
+                hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
+                             "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
+                return -1;
+        }
 
-        for (i = 0; ff_bits[i] >= 0; i++)
-                set_bit(ff_bits[i], dev->ffbit);
+        /* 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);
 
         error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);