This patch adds a driver for the Nintendo Nunchuck (wiimote accessory)
attached to an i2c bus via something like a wiichuck adapter board
from Sparkfun.
Signed-off-by: Grant Likely <grant.likely@xxxxxxxxxxxx>
---
This is RFC because the driver doesn't completely work yet. The
joystick and buttons work fine. There is a bug with the accelerometer
reporting though (nothing gets reported), and I'm not even sure I'm
using the right input type for reporting accelerometer values.
Comments welcome.
drivers/input/joystick/Kconfig | 8 +
drivers/input/joystick/Makefile | 1
drivers/input/joystick/wiichuck.c | 225 +++++++++++++++++++++++++++++++++++++
3 files changed, 234 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/joystick/wiichuck.c
diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index 56eb471..79f18db 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -193,6 +193,14 @@ config JOYSTICK_TWIDJOY
To compile this driver as a module, choose M here: the
module will be called twidjoy.
+config JOYSTICK_WIICHUCK
+ tristate "Nintendo Nunchuck on i2c bus"
+ depends on I2C
+ select INPUT_POLLDEV
+ help
+ Say Y here if you have a Nintendo Nunchuck directly attached to
+ the machine's i2c bus.
+
config JOYSTICK_ZHENHUA
tristate "5-byte Zhenhua RC transmitter"
select SERIO
diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile
index 92dc0de..78466d6 100644
--- a/drivers/input/joystick/Makefile
+++ b/drivers/input/joystick/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_JOYSTICK_TMDC) += tmdc.o
obj-$(CONFIG_JOYSTICK_TURBOGRAFX) += turbografx.o
obj-$(CONFIG_JOYSTICK_TWIDJOY) += twidjoy.o
obj-$(CONFIG_JOYSTICK_WARRIOR) += warrior.o
+obj-$(CONFIG_JOYSTICK_WIICHUCK) += wiichuck.o
obj-$(CONFIG_JOYSTICK_XPAD) += xpad.o
obj-$(CONFIG_JOYSTICK_ZHENHUA) += zhenhua.o
obj-$(CONFIG_JOYSTICK_WALKERA0701) += walkera0701.o
diff --git a/drivers/input/joystick/wiichuck.c b/drivers/input/joystick/wiichuck.c
new file mode 100644
index 0000000..2afc274
--- /dev/null
+++ b/drivers/input/joystick/wiichuck.c
@@ -0,0 +1,225 @@
+/*
+ * Nintendo Nunchuck driver for i2c connection.
+ *
+ * Copyright (c) 2011 Secret Lab Technologies Ltd.
+ *
+ * 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/delay.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/input-polldev.h>
+#include <linux/mod_devicetable.h>
+#include <linux/slab.h>
+
+MODULE_AUTHOR("Grant Likely <grant.likely@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Nintendo Nunchuck driver");
+MODULE_LICENSE("GPL");
+
+#define WIICHUCK_JOY_MAX_AXIS 220
+#define WIICHUCK_JOY_MIN_AXIS 30
+#define WIICHUCK_JOY_FUZZ 4
+#define WIICHUCK_JOY_FLAT 8
+
+struct wiichuck_device {
+ struct input_polled_dev *poll_dev;
+ struct i2c_client *i2c_client;
+ int state;
+};
+
+static void wiichuck_poll(struct input_polled_dev *poll_dev)
+{
+ struct wiichuck_device *wiichuck = poll_dev->private;
+ struct i2c_client *i2c = wiichuck->i2c_client;
+ static uint8_t cmd_byte = 0;
+ struct i2c_msg cmd_msg =
+ { .addr = i2c->addr, .len = 1, .buf = &cmd_byte };
+ uint8_t b[6];
+ struct i2c_msg data_msg =
+ { .addr = i2c->addr, .flags = I2C_M_RD, .len = 6, .buf = b };
+ int jx, jy, ax, ay, az;
+ bool c, z;
+
+ switch (wiichuck->state) {
+ case 0:
+ i2c_transfer(i2c->adapter, &cmd_msg, 1);
+ wiichuck->state = 1;
+ break;
+
+ case 1:
+ i2c_transfer(i2c->adapter, &data_msg, 1);
+
+ jx = b[0];
+ jy = b[1];
+ ax = (b[2] << 2) & ((b[5] >> 2) & 0x3);
+ ay = (b[3] << 2) & ((b[5] >> 4) & 0x3);
+ az = (b[4] << 2) & ((b[5] >> 6) & 0x3);
+ z = !(b[5] & 1);
+ c = !(b[5] & 2);
+
+ input_report_abs(poll_dev->input, ABS_X, jx);
+ input_report_abs(poll_dev->input, ABS_Y, jy);
+ input_report_abs(poll_dev->input, ABS_RX, ax);
+ input_report_abs(poll_dev->input, ABS_RY, ax);
+ input_report_abs(poll_dev->input, ABS_RZ, ay);
+ input_report_key(poll_dev->input, BTN_C, c);
+ input_report_key(poll_dev->input, BTN_Z, z);
+ input_sync(poll_dev->input);
+
+ wiichuck->state = 0;
+ dev_dbg(&i2c->dev, "wiichuck: j=%.3i,%.3i a=%.3x,%.3x,%.3x %c%c\n",
+ jx,jy, ax,ay,az, c ? 'C' : 'c', z ? 'Z' : 'z');
+ break;
+
+ default:
+ wiichuck->state = 0;
+ }
+}
+
+static void wiichuck_open(struct input_polled_dev *poll_dev)
+{
+ struct wiichuck_device *wiichuck = poll_dev->private;
+ struct i2c_client *i2c = wiichuck->i2c_client;
+ static uint8_t data1[2] = { 0xf0, 0x55 };
+ static uint8_t data2[2] = { 0xfb, 0x00 };
+ struct i2c_msg msg1 = { .addr = i2c->addr, .len = 2, .buf = data1 };
+ struct i2c_msg msg2 = { .addr = i2c->addr, .len = 2, .buf = data2 };
+
+ i2c_transfer(i2c->adapter, &msg1, 1);
+ i2c_transfer(i2c->adapter, &msg2, 1);
+ wiichuck->state = 0;
+
+ dev_dbg(&i2c->dev, "wiichuck open()\n");
+}
+
+static int __devinit wiichuck_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct wiichuck_device *wiichuck;
+ struct input_polled_dev *poll_dev;
+ struct input_dev *input_dev;
+ int rc;
+
+ wiichuck = kzalloc(sizeof(*wiichuck), GFP_KERNEL);
+ if (!wiichuck)
+ return -ENOMEM;
+
+ poll_dev = input_allocate_polled_device();
+ if (!poll_dev) {
+ rc = -ENOMEM;
+ goto err_alloc;
+ }
+
+ wiichuck->i2c_client = client;
+ wiichuck->poll_dev = poll_dev;
+
+ poll_dev->private = wiichuck;
+ poll_dev->poll = wiichuck_poll;
+ poll_dev->poll_interval = 50; /* Poll every 50ms */
+ poll_dev->open = wiichuck_open;
+
+ input_dev = poll_dev->input;
+ input_dev->name = "Nintendo Nunchuck";
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->dev.parent = &client->dev;
+
+ /* Declare the events generated by this driver */
+ set_bit(EV_ABS, input_dev->evbit);
+ set_bit(ABS_X, input_dev->absbit); /* joystick */
+ set_bit(ABS_Y, input_dev->absbit);
+ set_bit(ABS_RX, input_dev->absbit); /* accelerometer */
+ set_bit(ABS_RY, input_dev->absbit);
+ set_bit(ABS_RZ, input_dev->absbit);
+
+ set_bit(EV_KEY, input_dev->evbit);
+ set_bit(BTN_C, input_dev->keybit); /* buttons */
+ set_bit(BTN_Z, input_dev->keybit);
+
+ input_set_abs_params(input_dev, ABS_X, 30, 220, 4, 8);
+ input_set_abs_params(input_dev, ABS_Y, 40, 200, 4, 8);
+ input_set_abs_params(input_dev, ABS_RX, 0, 0x3ff, 4, 8);
+ input_set_abs_params(input_dev, ABS_RY, 0, 0x3ff, 4, 8);
+ input_set_abs_params(input_dev, ABS_RZ, 0, 0x3ff, 4, 8);
+
+ rc = input_register_polled_device(wiichuck->poll_dev);
+ if (rc) {
+ dev_err(&client->dev, "Failed to register input device\n");
+ goto err_register;
+ }
+
+ i2c_set_clientdata(client, wiichuck);
+
+ return 0;
+
+ err_register:
+ input_free_polled_device(poll_dev);
+ err_alloc:
+ kfree(wiichuck);
+
+ return rc;
+}
+
+static int __devexit wiichuck_remove(struct i2c_client *client)
+{
+ struct wiichuck_device *wiichuck = i2c_get_clientdata(client);
+
+ i2c_set_clientdata(client, NULL);
+ input_unregister_polled_device(wiichuck->poll_dev);
+ input_free_polled_device(wiichuck->poll_dev);
+ kfree(wiichuck);
+
+ return 0;
+}
+
+static const struct i2c_device_id wiichuck_id[] = {
+ { "nunchuck", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wiichuck_id);
+
+#ifdef CONFIG_OF
+static struct of_device_id wiichuck_match_table[] __devinitdata = {
+ { .compatible = "nintendo,nunchuck", },
+ { }
+};
+#else
+#define wiichuck_match_table NULL
+#endif
+
+static struct i2c_driver wiichuck_driver = {
+ .driver = {
+ .name = "nunchuck",
+ .owner = THIS_MODULE,
+ .of_match_table = wiichuck_match_table,
+ },
+ .probe = wiichuck_probe,
+ .remove = __devexit_p(wiichuck_remove),
+ .id_table = wiichuck_id,
+};
+
+static int __init wiichuck_init(void)
+{
+ return i2c_add_driver(&wiichuck_driver);
+}
+module_init(wiichuck_init);
+
+static void __exit wiichuck_exit(void)
+{
+ i2c_del_driver(&wiichuck_driver);
+}
+module_exit(wiichuck_exit);
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