- 根目录:
- drivers
- hid
- hid-lg4ff.c
/*
* Force feedback support for Logitech Speed Force Wireless
*
* http://wiibrew.org/wiki/Logitech_USB_steering_wheel
*
* Copyright (c) 2010 Simon Wood <simon@mungewell.org>
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/hid.h>
#include "usbhid/usbhid.h"
#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
#define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)
static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_range_show, lg4ff_range_store);
static bool list_inited;
struct lg4ff_device_entry {
char *device_id; /* Use name in respective kobject structure's address as the ID */
__u16 range;
__u16 min_range;
__u16 max_range;
__u8 leds;
struct list_head list;
void (*set_range)(struct hid_device *hid, u16 range);
};
static struct lg4ff_device_entry device_list;
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;
void (*set_range)(struct hid_device *hid, u16 range);
};
static const struct lg4ff_wheel lg4ff_devices[] = {
{USB_DEVICE_ID_LOGITECH_WHEEL, lg4ff_wheel_effects, 40, 270, NULL},
{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL, lg4ff_wheel_effects, 40, 270, NULL},
{USB_DEVICE_ID_LOGITECH_DFP_WHEEL, lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_dfp},
{USB_DEVICE_ID_LOGITECH_G25_WHEEL, lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
{USB_DEVICE_ID_LOGITECH_DFGT_WHEEL, lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
{USB_DEVICE_ID_LOGITECH_G27_WHEEL, lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
{USB_DEVICE_ID_LOGITECH_WII_WHEEL, lg4ff_wheel_effects, 40, 270, NULL}
};
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)
{
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);
int x;
#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
switch (effect->type) {
case FF_CONSTANT:
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] = 0x08;
report->field[0]->value[2] = x;
report->field[0]->value[3] = 0x80;
report->field[0]->value[4] = 0x00;
report->field[0]->value[5] = 0x00;
report->field[0]->value[6] = 0x00;
usbhid_submit_report(hid, report, USB_DIR_OUT);
break;
}
return 0;
}
/* 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;
struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
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);
}
/* 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)
{
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);
dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
report->field[0]->value[0] = 0xf8;
report->field[0]->value[1] = 0x81;
report->field[0]->value[2] = range & 0x00ff;
report->field[0]->value[3] = (range & 0xff00) >> 8;
report->field[0]->value[4] = 0x00;
report->field[0]->value[5] = 0x00;
report->field[0]->value[6] = 0x00;
usbhid_submit_report(hid, report, USB_DIR_OUT);
}
/* Sends commands to set range compatible with Driving Force Pro wheel */
static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
{
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);
int start_left, start_right, full_range;
dbg_hid("Driving Force Pro: setting range to %u\n", range);
/* Prepare "coarse" limit command */
report->field[0]->value[0] = 0xf8;
report->field[0]->value[1] = 0x00; /* Set later */
report->field[0]->value[2] = 0x00;
report->field[0]->value[3] = 0x00;
report->field[0]->value[4] = 0x00;
report->field[0]->value[5] = 0x00;
report->field[0]->value[6] = 0x00;
if (range > 200) {
report->field[0]->value[1] = 0x03;
full_range = 900;
} else {
report->field[0]->value[1] = 0x02;
full_range = 200;
}
usbhid_submit_report(hid, report, USB_DIR_OUT);
/* Prepare "fine" limit command */
report->field[0]->value[0] = 0x81;
report->field[0]->value[1] = 0x0b;
report->field[0]->value[2] = 0x00;
report->field[0]->value[3] = 0x00;
report->field[0]->value[4] = 0x00;
report->field[0]->value[5] = 0x00;
report->field[0]->value[6] = 0x00;
if (range == 200 || range == 900) { /* Do not apply any fine limit */
usbhid_submit_report(hid, report, USB_DIR_OUT);
return;
}
/* Construct fine limit command */
start_left = (((full_range - range + 1) * 2047) / full_range);
start_right = 0xfff - start_left;
report->field[0]->value[2] = start_left >> 4;
report->field[0]->value[3] = start_right >> 4;
report->field[0]->value[4] = 0xff;
report->field[0]->value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
report->field[0]->value[6] = 0xff;
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);
}
}
/* Read current range and display it in terminal */
static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct lg4ff_device_entry *uninitialized_var(entry);
struct list_head *h;
struct hid_device *hid = to_hid_device(dev);
size_t count;
list_for_each(h, &device_list.list) {
entry = list_entry(h, struct lg4ff_device_entry, list);
if (strcmp(entry->device_id, (&hid->dev)->kobj.name) == 0)
break;
}
if (h == &device_list.list) {
dbg_hid("Device not found!");
return 0;
}
count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
return count;
}
/* Set range to user specified value, call appropriate function
* according to the type of the wheel */
static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct lg4ff_device_entry *uninitialized_var(entry);
struct list_head *h;
struct hid_device *hid = to_hid_device(dev);
__u16 range = simple_strtoul(buf, NULL, 10);
list_for_each(h, &device_list.list) {
entry = list_entry(h, struct lg4ff_device_entry, list);
if (strcmp(entry->device_id, (&hid->dev)->kobj.name) == 0)
break;
}
if (h == &device_list.list) {
dbg_hid("Device not found!");
return count;
}
if (range == 0)
range = entry->max_range;
/* Check if the wheel supports range setting
* and that the range is within limits for the wheel */
if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
entry->set_range(hid, range);
entry->range = range;
}
return count;
}
int lg4ff_init(struct hid_device *hid)
{
struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
struct input_dev *dev = hidinput->input;
struct hid_report *report;
struct hid_field *field;
struct lg4ff_device_entry *entry;
struct usb_device_descriptor *udesc;
int error, i, j;
__u16 bcdDevice, rev_maj, rev_min;
/* Find the report to use */
if (list_empty(report_list)) {
hid_err(hid, "No output report found\n");
return -1;
}
/* Check that the report looks ok */
report = list_entry(report_list->next, struct hid_report, list);
if (!report) {
hid_err(hid, "NULL output report\n");
return -1;
}
field = report->field[0];
if (!field) {
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;
}
/* 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);
error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
if (error)
return error;
/* 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) {
INIT_LIST_HEAD(&device_list.list);
list_inited = 1;
}
/* Add the device to device_list */
entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
if (!entry) {
hid_err(hid, "Cannot add device, insufficient memory.\n");
return -ENOMEM;
}
entry->device_id = kstrdup((&hid->dev)->kobj.name, GFP_KERNEL);
if (!entry->device_id) {
hid_err(hid, "Cannot set device_id, insufficient memory.\n");
kfree(entry);
return -ENOMEM;
}
entry->min_range = lg4ff_devices[i].min_range;
entry->max_range = lg4ff_devices[i].max_range;
entry->set_range = lg4ff_devices[i].set_range;
list_add(&entry->list, &device_list.list);
/* Create sysfs interface */
error = device_create_file(&hid->dev, &dev_attr_range);
if (error)
return error;
dbg_hid("sysfs interface created\n");
/* Set the maximum range to start with */
entry->range = entry->max_range;
if (entry->set_range != NULL)
entry->set_range(hid, entry->range);
hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n");
return 0;
}
int lg4ff_deinit(struct hid_device *hid)
{
bool found = 0;
struct lg4ff_device_entry *entry;
struct list_head *h, *g;
list_for_each_safe(h, g, &device_list.list) {
entry = list_entry(h, struct lg4ff_device_entry, list);
if (strcmp(entry->device_id, (&hid->dev)->kobj.name) == 0) {
list_del(h);
kfree(entry->device_id);
kfree(entry);
found = 1;
break;
}
}
if (!found) {
dbg_hid("Device entry not found!\n");
return -1;
}
device_remove_file(&hid->dev, &dev_attr_range);
dbg_hid("Device successfully unregistered\n");
return 0;
}