HID: add FF support for Holtek On Line Grip based gamepads

Add force feedback support for Holtek On Line Grip based HID devices.

The protocol is more complex than that of most other rumblepads, but the
device still needs to be handled as a memoryless one.

Tested by Cleber de Mattos Casali with a 1241:5015 "Clone Joypad Super
Power Fire" gamepad, with help from Hendrik Iben <hendrik_iben@web.de>.
Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Tested-by: Cleber de Mattos Casali <clebercasali@yahoo.com.br>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/Kconfig

@@ -172,6 +172,20 @@ config HID_EZKEY
 	---help---
 	Support for Ezkey BTC 8193 keyboard.
 
+config HID_HOLTEK
+	tristate "Holtek On Line Grip based game controller support"
+	depends on USB_HID
+	---help---
+	  Say Y here if you have a Holtek On Line Grip based game controller.
+
+config HOLTEK_FF
+	bool "Holtek On Line Grip force feedback support"
+	depends on HID_HOLTEK
+	select INPUT_FF_MEMLESS
+	---help---
+	  Say Y here if you have a Holtek On Line Grip based game controller
+	  and want to have force feedback support for it.
+
 config HID_KEYTOUCH
 	tristate "Keytouch HID devices"
 	depends on USB_HID

drivers/hid/Makefile

@@ -37,6 +37,7 @@ obj-$(CONFIG_HID_EMS_FF)	+= hid-emsff.o
 obj-$(CONFIG_HID_ELECOM)	+= hid-elecom.o
 obj-$(CONFIG_HID_EZKEY)		+= hid-ezkey.o
 obj-$(CONFIG_HID_GYRATION)	+= hid-gyration.o
+obj-$(CONFIG_HID_HOLTEK)	+= hid-holtekff.o
 obj-$(CONFIG_HID_KENSINGTON)	+= hid-kensington.o
 obj-$(CONFIG_HID_KEYTOUCH)	+= hid-keytouch.o
 obj-$(CONFIG_HID_KYE)		+= hid-kye.o

drivers/hid/hid-core.c

@@ -1387,6 +1387,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE_2) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE_3) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_HANVON, USB_DEVICE_ID_HANVON_MULTITOUCH) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK, USB_DEVICE_ID_HOLTEK_ON_LINE_GRIP) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ILITEK, USB_DEVICE_ID_ILITEK_MULTITOUCH) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_IRTOUCHSYSTEMS, USB_DEVICE_ID_IRTOUCH_INFRARED_USB) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_KENSINGTON, USB_DEVICE_ID_KS_SLIMBLADE) },

drivers/hid/hid-holtekff.c

+/*
+ *  Force feedback support for Holtek On Line Grip based gamepads
+ *
+ *  These include at least a Brazilian "Clone Joypad Super Power Fire"
+ *  which uses vendor ID 0x1241 and identifies as "HOLTEK On Line Grip".
+ *
+ *  Copyright (c) 2011 Anssi Hannula <anssi.hannula@iki.fi>
+ */
+
+/*
+ * 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/hid.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+
+#include "hid-ids.h"
+
+#ifdef CONFIG_HOLTEK_FF
+#include "usbhid/usbhid.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Anssi Hannula <anssi.hannula@iki.fi>");
+MODULE_DESCRIPTION("Force feedback support for Holtek On Line Grip based devices");
+
+/*
+ * These commands and parameters are currently known:
+ *
+ * byte 0: command id:
+ * 	01  set effect parameters
+ * 	02  play specified effect
+ * 	03  stop specified effect
+ * 	04  stop all effects
+ * 	06  stop all effects
+ * 	(the difference between 04 and 06 isn't known; win driver
+ * 	 sends 06,04 on application init, and 06 otherwise)
+ * 
+ * Commands 01 and 02 need to be sent as pairs, i.e. you need to send 01
+ * before each 02.
+ *
+ * The rest of the bytes are parameters. Command 01 takes all of them, and
+ * commands 02,03 take only the effect id.
+ *
+ * byte 1:
+ *	bits 0-3: effect id:
+ * 		1: very strong rumble
+ * 		2: periodic rumble, short intervals
+ * 		3: very strong rumble
+ * 		4: periodic rumble, long intervals
+ * 		5: weak periodic rumble, long intervals
+ * 		6: weak periodic rumble, short intervals
+ * 		7: periodic rumble, short intervals
+ * 		8: strong periodic rumble, short intervals
+ * 		9: very strong rumble
+ * 		a: causes an error
+ * 		b: very strong periodic rumble, very short intervals
+ * 		c-f: nothing
+ *	bit 6: right (weak) motor enabled
+ *	bit 7: left (strong) motor enabled
+ *
+ * bytes 2-3:  time in milliseconds, big-endian
+ * bytes 5-6:  unknown (win driver seems to use at least 10e0 with effect 1
+ * 		       and 0014 with effect 6)
+ * byte 7:
+ *	bits 0-3: effect magnitude
+ */
+
+#define HOLTEKFF_MSG_LENGTH     7
+
+static const u8 start_effect_1[] = { 0x02, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 };
+static const u8 stop_all4[] =	   { 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+static const u8 stop_all6[] =	   { 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+
+struct holtekff_device {
+	struct hid_field *field;
+};
+
+static void holtekff_send(struct holtekff_device *holtekff,
+			  struct hid_device *hid,
+			  const u8 data[HOLTEKFF_MSG_LENGTH])
+{
+	int i;
+
+	for (i = 0; i < HOLTEKFF_MSG_LENGTH; i++) {
+		holtekff->field->value[i] = data[i];
+	}
+
+	dbg_hid("sending %02x %02x %02x %02x %02x %02x %02x\n", data[0],
+		data[1], data[2], data[3], data[4], data[5], data[6]);
+
+	usbhid_submit_report(hid, holtekff->field->report, USB_DIR_OUT);
+}
+
+static int holtekff_play(struct input_dev *dev, void *data,
+			 struct ff_effect *effect)
+{
+	struct hid_device *hid = input_get_drvdata(dev);
+	struct holtekff_device *holtekff = data;
+	int left, right;
+	/* effect type 1, length 65535 msec */
+	u8 buf[HOLTEKFF_MSG_LENGTH] =
+		{ 0x01, 0x01, 0xff, 0xff, 0x10, 0xe0, 0x00 };
+
+	left = effect->u.rumble.strong_magnitude;
+	right = effect->u.rumble.weak_magnitude;
+	dbg_hid("called with 0x%04x 0x%04x\n", left, right);
+
+	if (!left && !right) {
+		holtekff_send(holtekff, hid, stop_all6);
+		return 0;
+	}
+
+	if (left)
+		buf[1] |= 0x80;
+	if (right)
+		buf[1] |= 0x40;
+
+	/* The device takes a single magnitude, so we just sum them up. */
+	buf[6] = min(0xf, (left >> 12) + (right >> 12));
+
+	holtekff_send(holtekff, hid, buf);
+	holtekff_send(holtekff, hid, start_effect_1);
+
+	return 0;
+}
+
+static int holtekff_init(struct hid_device *hid)
+{
+	struct holtekff_device *holtekff;
+	struct hid_report *report;
+	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;
+	int error;
+
+	if (list_empty(report_list)) {
+		hid_err(hid, "no output report found\n");
+		return -ENODEV;
+	}
+
+	report = list_entry(report_list->next, struct hid_report, list);
+
+	if (report->maxfield < 1 || report->field[0]->report_count != 7) {
+		hid_err(hid, "unexpected output report layout\n");
+		return -ENODEV;
+	}
+
+	holtekff = kzalloc(sizeof(*holtekff), GFP_KERNEL);
+	if (!holtekff)
+		return -ENOMEM;
+
+	set_bit(FF_RUMBLE, dev->ffbit);
+
+	holtekff->field = report->field[0];
+
+	/* initialize the same way as win driver does */
+	holtekff_send(holtekff, hid, stop_all4);
+	holtekff_send(holtekff, hid, stop_all6);
+
+	error = input_ff_create_memless(dev, holtekff, holtekff_play);
+	if (error) {
+		kfree(holtekff);
+		return error;
+	}
+
+	hid_info(hid, "Force feedback for Holtek On Line Grip based devices by Anssi Hannula <anssi.hannula@iki.fi>\n");
+
+	return 0;
+}
+#else
+static inline int holtekff_init(struct hid_device *hid)
+{
+	return 0;
+}
+#endif
+
+static int holtek_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	int ret;
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		hid_err(hdev, "parse failed\n");
+		goto err;
+	}
+
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
+	if (ret) {
+		hid_err(hdev, "hw start failed\n");
+		goto err;
+	}
+
+	holtekff_init(hdev);
+
+	return 0;
+err:
+	return ret;
+}
+
+static const struct hid_device_id holtek_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK, USB_DEVICE_ID_HOLTEK_ON_LINE_GRIP) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, holtek_devices);
+
+static struct hid_driver holtek_driver = {
+	.name = "holtek",
+	.id_table = holtek_devices,
+	.probe = holtek_probe,
+};
+
+static int __init holtek_init(void)
+{
+	return hid_register_driver(&holtek_driver);
+}
+
+static void __exit holtek_exit(void)
+{
+	hid_unregister_driver(&holtek_driver);
+}
+
+module_init(holtek_init);
+module_exit(holtek_exit);
+

drivers/hid/hid-ids.h

@@ -347,6 +347,9 @@
 #define USB_VENDOR_ID_ILITEK		0x222a
 #define USB_DEVICE_ID_ILITEK_MULTITOUCH	0x0001
 
+#define USB_VENDOR_ID_HOLTEK		0x1241
+#define USB_DEVICE_ID_HOLTEK_ON_LINE_GRIP	0x5015
+
 #define USB_VENDOR_ID_IMATION		0x0718
 #define USB_DEVICE_ID_DISC_STAKKA	0xd000