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HID: hid-logitech: Introduce control for combined pedals feature

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Introduce a dev_attr which can be used to combine the accelerator
and brake pedals into a single axis. This is useful for older games
which can not handle seperate accelerator and brake.

Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Simon Wood 2016-09-18 10:55:37 -06:00 committed by Jiri Kosina
parent 884316deb4
commit 961af46f8e
2 changed files with 67 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-driver-hid-logitech-lg4ff
View File

@ -50,3 +50,12 @@ Description: Displays the real model of the wheel regardless of any
alternate mode the wheel might be switched to.
It is a read-only value.
This entry is not created for devices that have only one mode.
What: /sys/bus/hid/drivers/logitech/<dev>/combine_pedals
Date: Sep 2016
KernelVersion: 4.9
Contact: Simon Wood <simon@mungewell.org>
Description: Controls whether a combined value of accelerator and brake is
reported on the Y axis of the controller. Useful for older games
which can do not work with separate accelerator/brake axis.
Off ('0') by default, enabled by setting '1'.

58
drivers/hid/hid-lg4ff.c
View File

@ -75,6 +75,7 @@ static void lg4ff_set_range_g25(struct hid_device *hid, u16 range);
struct lg4ff_wheel_data {
const u32 product_id;
u16 combine;
u16 range;
const u16 min_range;
const u16 max_range;
@ -345,6 +346,7 @@ static void lg4ff_init_wheel_data(struct lg4ff_wheel_data * const wdata, const s
{
struct lg4ff_wheel_data t_wdata = { .product_id = wheel->product_id,
.real_product_id = real_product_id,
.combine = 0,
.min_range = wheel->min_range,
.max_range = wheel->max_range,
.set_range = wheel->set_range,
@ -885,6 +887,58 @@ static ssize_t lg4ff_alternate_modes_store(struct device *dev, struct device_att
}
static DEVICE_ATTR(alternate_modes, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_alternate_modes_show, lg4ff_alternate_modes_store);
static ssize_t lg4ff_combine_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct hid_device *hid = to_hid_device(dev);
struct lg4ff_device_entry *entry;
struct lg_drv_data *drv_data;
size_t count;
drv_data = hid_get_drvdata(hid);
if (!drv_data) {
hid_err(hid, "Private driver data not found!\n");
return 0;
}
entry = drv_data->device_props;
if (!entry) {
hid_err(hid, "Device properties not found!\n");
return 0;
}
count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.combine);
return count;
}
static ssize_t lg4ff_combine_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hid = to_hid_device(dev);
struct lg4ff_device_entry *entry;
struct lg_drv_data *drv_data;
u16 combine = simple_strtoul(buf, NULL, 10);
drv_data = hid_get_drvdata(hid);
if (!drv_data) {
hid_err(hid, "Private driver data not found!\n");
return -EINVAL;
}
entry = drv_data->device_props;
if (!entry) {
hid_err(hid, "Device properties not found!\n");
return -EINVAL;
}
if (combine > 1)
combine = 1;
entry->wdata.combine = combine;
return count;
}
static DEVICE_ATTR(combine_pedals, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_combine_show, lg4ff_combine_store);
/* Export the currently set range of the wheel */
static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr,
char *buf)
@ -1259,6 +1313,9 @@ int lg4ff_init(struct hid_device *hid)
}
/* Create sysfs interface */
error = device_create_file(&hid->dev, &dev_attr_combine_pedals);
if (error)
hid_warn(hid, "Unable to create sysfs interface for \"combine\", errno %d\n", error);
error = device_create_file(&hid->dev, &dev_attr_range);
if (error)
hid_warn(hid, "Unable to create sysfs interface for \"range\", errno %d\n", error);
@ -1358,6 +1415,7 @@ int lg4ff_deinit(struct hid_device *hid)
device_remove_file(&hid->dev, &dev_attr_alternate_modes);
}
device_remove_file(&hid->dev, &dev_attr_combine_pedals);
device_remove_file(&hid->dev, &dev_attr_range);
#ifdef CONFIG_LEDS_CLASS
{