HID: hid-logitech: Introduce control for combined pedals feature (961af46f) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-driver-hid-logitech-lg4ff

+9 −0

Original line number	Diff line number	Diff line
		@@ -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'.

drivers/hid/hid-lg4ff.c

+58 −0

Original line number	Diff line number	Diff line
		@@ -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
		{

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