v4.19.13 snapshot.
diff --git a/drivers/hid/hid-axff.c b/drivers/hid/hid-axff.c
new file mode 100644
index 0000000..a594e47
--- /dev/null
+++ b/drivers/hid/hid-axff.c
@@ -0,0 +1,198 @@
+/*
+ * Force feedback support for ACRUX game controllers
+ *
+ * From what I have gathered, these devices are mass produced in China
+ * by several vendors. They often share the same design as the original
+ * Xbox 360 controller.
+ *
+ * 1a34:0802 "ACRUX USB GAMEPAD 8116"
+ * - tested with an EXEQ EQ-PCU-02090 game controller.
+ *
+ * Copyright (c) 2010 Sergei Kolzun <x0r@dv-life.ru>
+ */
+
+/*
+ * 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/slab.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+#ifdef CONFIG_HID_ACRUX_FF
+
+struct axff_device {
+ struct hid_report *report;
+};
+
+static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
+{
+ struct hid_device *hid = input_get_drvdata(dev);
+ struct axff_device *axff = data;
+ struct hid_report *report = axff->report;
+ int field_count = 0;
+ int left, right;
+ int i, j;
+
+ left = effect->u.rumble.strong_magnitude;
+ right = effect->u.rumble.weak_magnitude;
+
+ dbg_hid("called with 0x%04x 0x%04x", left, right);
+
+ left = left * 0xff / 0xffff;
+ right = right * 0xff / 0xffff;
+
+ for (i = 0; i < report->maxfield; i++) {
+ for (j = 0; j < report->field[i]->report_count; j++) {
+ report->field[i]->value[j] =
+ field_count % 2 ? right : left;
+ field_count++;
+ }
+ }
+
+ dbg_hid("running with 0x%02x 0x%02x", left, right);
+ hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
+
+ return 0;
+}
+
+static int axff_init(struct hid_device *hid)
+{
+ struct axff_device *axff;
+ struct hid_report *report;
+ struct hid_input *hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
+ struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
+ struct input_dev *dev = hidinput->input;
+ int field_count = 0;
+ int i, j;
+ int error;
+
+ if (list_empty(report_list)) {
+ hid_err(hid, "no output reports found\n");
+ return -ENODEV;
+ }
+
+ report = list_first_entry(report_list, struct hid_report, list);
+ for (i = 0; i < report->maxfield; i++) {
+ for (j = 0; j < report->field[i]->report_count; j++) {
+ report->field[i]->value[j] = 0x00;
+ field_count++;
+ }
+ }
+
+ if (field_count < 4 && hid->product != 0xf705) {
+ hid_err(hid, "not enough fields in the report: %d\n",
+ field_count);
+ return -ENODEV;
+ }
+
+ axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);
+ if (!axff)
+ return -ENOMEM;
+
+ set_bit(FF_RUMBLE, dev->ffbit);
+
+ error = input_ff_create_memless(dev, axff, axff_play);
+ if (error)
+ goto err_free_mem;
+
+ axff->report = report;
+ hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
+
+ hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n");
+
+ return 0;
+
+err_free_mem:
+ kfree(axff);
+ return error;
+}
+#else
+static inline int axff_init(struct hid_device *hid)
+{
+ return 0;
+}
+#endif
+
+static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+ int error;
+
+ dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n");
+
+ error = hid_parse(hdev);
+ if (error) {
+ hid_err(hdev, "parse failed\n");
+ return error;
+ }
+
+ error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
+ if (error) {
+ hid_err(hdev, "hw start failed\n");
+ return error;
+ }
+
+ error = axff_init(hdev);
+ if (error) {
+ /*
+ * Do not fail device initialization completely as device
+ * may still be partially operable, just warn.
+ */
+ hid_warn(hdev,
+ "Failed to enable force feedback support, error: %d\n",
+ error);
+ }
+
+ /*
+ * We need to start polling device right away, otherwise
+ * it will go into a coma.
+ */
+ error = hid_hw_open(hdev);
+ if (error) {
+ dev_err(&hdev->dev, "hw open failed\n");
+ hid_hw_stop(hdev);
+ return error;
+ }
+
+ return 0;
+}
+
+static void ax_remove(struct hid_device *hdev)
+{
+ hid_hw_close(hdev);
+ hid_hw_stop(hdev);
+}
+
+static const struct hid_device_id ax_devices[] = {
+ { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
+ { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0xf705), },
+ { }
+};
+MODULE_DEVICE_TABLE(hid, ax_devices);
+
+static struct hid_driver ax_driver = {
+ .name = "acrux",
+ .id_table = ax_devices,
+ .probe = ax_probe,
+ .remove = ax_remove,
+};
+module_hid_driver(ax_driver);
+
+MODULE_AUTHOR("Sergei Kolzun");
+MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
+MODULE_LICENSE("GPL");