Added clovercon module source code

3 files changed, 1396 insertions, 0 deletions

diff --git a/clovercon/LICENSE b/clovercon/LICENSE
new file mode 100644
index 00000000..d159169d
--- /dev/null
+++ b/clovercon/LICENSE
@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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diff --git a/clovercon/Makefile b/clovercon/Makefile
new file mode 100644
index 00000000..ad69f539
--- /dev/null
+++ b/clovercon/Makefile
@@ -0,0 +1,27 @@
+CURRENT = $(shell uname -r)
+TARGET  = clovercon
+OBJS    = clovercon.o
+KDIR    = linux-nesmini
+#KDIR	= ~/linux
+PWD = $(shell pwd)
+DEST = .
+
+obj-m      := $(TARGET).o
+
+default:
+	make -C $(KDIR) SUBDIRS=$(PWD) ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
+	modinfo $(TARGET).ko
+	arm-linux-gnueabihf-strip --strip-unneeded $(TARGET).ko
+
+$(TARGET).o: $(OBJS)
+	$(LD) $(LD_RFLAG) ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -r -o $@ $(OBJS)
+
+install:
+	su -c "cp -v $(TARGET).ko $(DEST) && /sbin/depmod -a"
+
+clean:
+	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) clean
+
+.PHONY: modules clean
+
+-include $(KDIR)/Rules.make
diff --git a/clovercon/clovercon.c b/clovercon/clovercon.c
new file mode 100644
index 00000000..043b2b9c
--- /dev/null
+++ b/clovercon/clovercon.c
@@ -0,0 +1,1030 @@
+/* --------------------------------------------------------------------------
+ * @license_begin
+ *
+ *  Controllers I2C driver
+ *  Copyright (C) 2016  Nintendo Co. 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
+ *
+ *  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.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * @license_end
+ * ----------------------------------------------------------------------- */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input-polldev.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/workqueue.h>
+#include <linux/mutex.h>
+#include <linux/bug.h>
+
+volatile char MAGIC_BUTTONS[] = "MAGIC_BUTTONS:00100100";
+volatile char MAGIC_AUTOFIRE[] = "MAGIC_AUTOFIRE:0";
+volatile char MAGIC_FC_START[] = "MAGIC_FC_START:0";
+
+MODULE_AUTHOR("Christophe Aguettaz <christophe.aguettaz@nerd.nintendo.com>");
+MODULE_DESCRIPTION("Nintendo Clover/Wii Classic/Wii Pro controllers on I2C");
+
+MODULE_LICENSE("GPL");
+
+#define DRV_NAME "clovercon"
+
+#define CLASSIC_ID             0
+#define CONTROLLER_I2C_ADDRESS 0x52
+//Rounded up to multiple of 1/HZ
+#define POLL_INTERVAL          5
+
+/* HOME button is to be reported only after these many successful polling
+ * positives.
+ * Keep it at ~0.1s, adapt whenever POLL_INTERVAL is changed */
+#define HOME_BUTTON_THRESHOLD 15
+#define RESET_COMBINATION_THRESHOLD 50
+#define AUTOFIRE_COMBINATION_THRESHOLD 150
+#define START_COMBINATION_THRESHOLD 150
+
+// Need to do some tests to calculate minimal interval
+#define AUTOFIRE_INTERVAL 8
+
+//Delay expressed in polling intervals
+#define RETRY_BASE_DELAY 512
+
+#define DATA_FORMAT    3
+
+#define DF3_BTN_R      1
+#define DF3_BTN_START  2
+#define DF3_BTN_HOME   3
+#define DF3_BTN_SELECT 4
+#define DF3_BTN_L      5
+#define DF3_BTN_DOWN   6
+#define DF3_BTN_RIGHT  7
+
+#define DF3_BTN_UP     0
+#define DF3_BTN_LEFT   1
+#define DF3_BTN_ZR     2
+#define DF3_BTN_X      3
+#define DF3_BTN_A      4
+#define DF3_BTN_Y      5
+#define DF3_BTN_B      6
+#define DF3_BTN_ZL     7
+
+#define DEAD_ZONE      20
+#define DIAG_MAX       40
+#define STICK_MAX      72
+#define STICK_FUZZ     4
+
+#define TRIGGER_MIN    0
+#define TRIGGER_MAX    0xff
+#define TRIGGER_FUZZ   4
+
+#define MAX_CON_COUNT  4
+
+#define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
+#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
+
+#define CLOVERCON_DETECT_USE_IRQ 0
+
+#if CLOVERCON_DETECT_USE_IRQ
+#define INVAL_IRQ            -1
+#define DETECT_DELAY         (HZ / 10)
+#else
+#define DETECT_DELAY         (HZ / 5)
+#endif
+
+#define DEBOUNCE_VALUE       0x71
+
+static struct delayed_work detect_work;
+
+static DEFINE_MUTEX(con_state_lock);
+static DEFINE_MUTEX(detect_task_lock);
+
+#define VERBOSITY        0
+
+#if VERBOSITY > 0
+	#define ERR(m, ...) printk(KERN_ERR  "Clovercon error: " m "\n", ##__VA_ARGS__)
+	#define INF(m, ...) printk(KERN_INFO  "Clovercon info: " m "\n", ##__VA_ARGS__)
+#else
+	#define ERR(m, ...)
+	#define INF(m, ...)
+#endif
+
+#if VERBOSITY > 1
+	#define DBG(m, ...) printk(KERN_DEBUG  "Clovercon: " m "\n", ##__VA_ARGS__)
+	#if VERBOSITY > 2
+		#define FAST_ERR(m, ...) ERR(m, ##__VA_ARGS__)
+		#define FAST_DBG(m, ...) DBG(m, ##__VA_ARGS__)
+	#else
+		#define FAST_ERR(m, ...) trace_printk(KERN_ERR  "Clovercon error: " m "\n", ##__VA_ARGS__)
+		#define FAST_DBG(m, ...) trace_printk(KERN_DEBUG  "Clovercon: " m "\n", ##__VA_ARGS__)
+	#endif
+#else
+	#define DBG(m, ...)
+	#define FAST_ERR(m, ...)
+	#define FAST_DBG(m, ...)
+#endif
+
+enum ControllerState {
+	CS_OK,
+	CS_RETRY_1,
+	CS_RETRY_2,
+	CS_ERR
+};
+
+static bool get_bit(u8 data, int bitnum) {
+	return (data & (1 << bitnum)) >> bitnum;
+}
+
+static const struct i2c_device_id clovercon_idtable[] = {
+	{ "classic", CLASSIC_ID },
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, clovercon_idtable);
+
+struct clovercon_info {
+	struct input_polled_dev *dev;
+	struct i2c_client *client;
+	struct i2c_adapter *adapter;
+#if CLOVERCON_DETECT_USE_IRQ
+	int irq;
+#endif
+	int detection_active;
+	int gpio;
+	int id;
+	enum ControllerState state;
+	u16 retry_counter;
+	int home_counter;
+	int reset_counter;
+	int autofire_timer;
+	int autofire_counter_a;
+	int autofire_counter_b;
+	bool autofire_a;
+	bool autofire_b;
+	int start_counter;
+};
+
+static struct clovercon_info con_info_list[MAX_CON_COUNT];
+static int module_params[2 * MAX_CON_COUNT];
+static int arr_argc = 0;
+
+#define CON_NAME_PREFIX "Nintendo Clovercon - controller"
+const char *controller_names[] = {CON_NAME_PREFIX"1", CON_NAME_PREFIX"2",
+                                  CON_NAME_PREFIX"3", CON_NAME_PREFIX"4"};
+
+module_param_array(module_params, int, &arr_argc, 0000);
+MODULE_PARM_DESC(module_params, "Input info in the form con0_i2c_bus, con0_detect_gpio, "
+	                            "form con1_i2c_bus, con1_detect_gpio, ... gpio < 0 means no detection");
+
+#if CLOVERCON_DETECT_USE_IRQ
+struct clovercon_info * clovercon_info_from_irq(int irq) {
+	int i;
+	for (i = 0; i < MAX_CON_COUNT; i++) {
+		if (con_info_list[i].irq == irq) {
+			return &con_info_list[i];
+		}
+	}
+	return NULL;
+}
+#endif
+
+struct clovercon_info * clovercon_info_from_adapter(struct i2c_adapter *adapter) {
+	int i;
+	for (i = 0; i < MAX_CON_COUNT; i++) {
+		if (con_info_list[i].adapter == adapter) {
+			return &con_info_list[i];
+		}
+	}
+	return NULL;
+}
+
+static int clovercon_write(struct i2c_client *client, u8 *data, size_t count) {
+	struct i2c_msg msg = {
+		.addr = client->addr,
+		.len = count,
+		.buf = data
+	};
+	int ret;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0) {
+		//read and write errors are DBG only to account for normal
+		//errors coming from disconnects
+		DBG("write failed with error %i", ret);
+		return ret;
+	} else if (ret != 1) {
+		DBG("incomplete write, return value: %i", ret);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int clovercon_prepare_read(struct i2c_client *client, u8 address) {
+	int ret;
+
+	ret = clovercon_write(client, &address, 1);
+	if (ret) {
+		DBG("prepare_read failed");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int clovercon_read(struct i2c_client *client, u8 address, u8 *values, size_t count) {
+	struct i2c_msg data_msg = {
+		.addr = client->addr,
+		.flags = I2C_M_RD,
+		.len = count,
+		.buf = values
+	};
+	int ret;
+
+	ret = clovercon_prepare_read(client, address);
+	if (ret)
+		return ret;
+
+	// Wait > 150µs before prepare_read and actual read
+	usleep_range(150, 200);
+
+	ret = i2c_transfer(client->adapter, &data_msg, 1);
+	if (ret < 0) {
+		DBG("read failed with error %i", ret);
+		return ret;
+	} else if (ret != 1) {
+		DBG("incomplete read, return value: %i", ret);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int clovercon_read_controller_info(struct i2c_client *client, u8 *data, size_t len) {
+	int ret;
+
+	len = MIN(len, 0xff -0xfa + 1);
+	ret = clovercon_read(client, 0xfa, data, len);
+	if (ret)
+		return ret;
+
+	return len;
+	// print_hex_dump(KERN_DEBUG, "Controller info data: " , DUMP_PREFIX_NONE, 16, 256, data, len, false);
+}
+
+static int clovercon_setup(struct i2c_client *client) {
+	u8 init_data[] = { 0xf0, 0x55, 0xfb, 0x00, 0xfe, DATA_FORMAT };
+	static const int CON_INFO_LEN = 6;
+	u8 con_info_data[CON_INFO_LEN];
+	int ret;
+
+	DBG("Clovercon setup");
+
+	ret = clovercon_write(client, &init_data[0], 2);
+	if (ret)
+		goto err;
+	ret = clovercon_write(client, &init_data[2], 2);
+	if (ret)
+		goto err;
+	ret = clovercon_write(client, &init_data[4], 2);
+	if (ret)
+		goto err;
+
+	ret = clovercon_read_controller_info(client, con_info_data, CON_INFO_LEN);
+	if (ret < 0) {
+		ERR("error reading controller info");
+		goto err;
+	} else if (ret != CON_INFO_LEN) {
+		ERR("wrong read length %i reading controller info", ret);
+		ret = -EIO;
+		goto err;
+	}
+	if (con_info_data[4] != DATA_FORMAT) {
+		ERR("failed to set data format, value is %i", (int)con_info_data[4]);
+		ret = -EIO;
+		goto err;
+	}
+	if (con_info_data[5] != 1) {
+		ERR("unsupported controller id %i", (int)con_info_data[5]);
+		ret = -EIO;
+		goto err;
+	}
+
+	return 0;
+
+err:
+	ERR("controller setup failed with error %i", -ret);
+	return ret;
+}
+
+static void clamp_stick(int *px, int *py) {
+	int x_sign = 1;
+	int y_sign = 1;
+	int x = *px;
+	int y = *py;
+	int norm;
+
+	if (x < 0) {
+		x_sign = -1;
+		x = -x;
+	}
+	if (y < 0) {
+		y_sign = -1;
+		y = -y;
+	}
+
+	x = MAX(0, x - DEAD_ZONE);
+	y = MAX(0, y - DEAD_ZONE);
+
+	if (x == 0 && y == 0) {
+		goto clamp_end;
+	}
+
+	norm = (y <= x) ? (DIAG_MAX * x + (STICK_MAX - DIAG_MAX) * y) :
+	                  (DIAG_MAX * y + (STICK_MAX - DIAG_MAX) * x);
+
+	if (DIAG_MAX * STICK_MAX < norm) {
+		x = DIAG_MAX * STICK_MAX * x / norm;
+		y = DIAG_MAX * STICK_MAX * y / norm;
+	}
+
+clamp_end:
+	*px = x * x_sign;
+	*py = y * y_sign;
+}
+
+static void clovercon_poll(struct input_polled_dev *polled_dev) {
+	struct clovercon_info *info = polled_dev->private;
+	static const int READ_LEN = 21;
+	u8 data[READ_LEN];
+	int jx, jy, rx, ry, tl, tr;
+	bool left, right, up, down, a, b, x, y, select, start, home, l, r, zl, zr, reset;
+	u16 retry_delay = RETRY_BASE_DELAY;
+	int ret;
+	bool turbo;
+
+	switch (info->state) {
+	case CS_OK:
+		ret = clovercon_read(info->client, 0, data, READ_LEN);
+		if (ret) {
+			DBG("read failed for active controller - possible controller disconnect");
+			INF("moving controller %i to error state", info->id);
+			info->state = CS_RETRY_1;
+			break;
+		}
+
+		//print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 256, data, READ_LEN, false);
+
+		/* The Wii could trust the payload 100% because the Wii Remote
+		 * controller is powered with AA batteries. In the case of
+		 * CLOVER high voltage on DC power supply has shown very noisy
+		 * payloads coming out of the I²C bus. But we don't have any
+		 * checksum or parity bits to discard such corrupted payloads.
+		 *
+		 * However the payload zero padding should be impacted by the
+		 * DC noise and some high bits should pop up there too.
+		 *
+		 * Use that as last resort discarding criteria */
+		jy = 0;
+		for (jx=8; jx<21; jx++) {
+			jy += data[jx];
+		}
+		if (jy) {
+			/* noise, discard payload */
+			break;
+		}
+
+		jx = data[0] - 0x80;
+		rx = data[1] - 0x80;
+		jy = 0x7fl - data[2];
+		ry = 0x7fl - data[3];
+		tl = data[4];
+		tr = data[5];
+
+		clamp_stick(&jx, &jy);
+		clamp_stick(&rx, &ry);
+
+		input_report_abs(polled_dev->input, ABS_X, jx);
+		input_report_abs(polled_dev->input, ABS_Y, jy);
+		input_report_abs(polled_dev->input, ABS_RX, rx);
+		input_report_abs(polled_dev->input, ABS_RY, ry);
+		input_report_abs(polled_dev->input, ABS_Z, tl);
+		input_report_abs(polled_dev->input, ABS_RZ, tr);
+
+		r      = !get_bit(data[6], DF3_BTN_R);
+		start  = !get_bit(data[6], DF3_BTN_START);
+		home   = !get_bit(data[6], DF3_BTN_HOME);
+		select = !get_bit(data[6], DF3_BTN_SELECT);
+		l      = !get_bit(data[6], DF3_BTN_L);
+		down   = !get_bit(data[6], DF3_BTN_DOWN);
+		right  = !get_bit(data[6], DF3_BTN_RIGHT);
+
+		up   = !get_bit(data[7], DF3_BTN_UP);
+		left = !get_bit(data[7], DF3_BTN_LEFT);
+		zr   = !get_bit(data[7], DF3_BTN_ZR);
+		x    = !get_bit(data[7], DF3_BTN_X);
+		y    = !get_bit(data[7], DF3_BTN_Y);
+		a    = !get_bit(data[7], DF3_BTN_A);
+		b    = !get_bit(data[7], DF3_BTN_B);
+		zl   = !get_bit(data[7], DF3_BTN_ZL);
+
+		// Reset combination
+		reset =
+		    ((MAGIC_BUTTONS[14] == '1') ^ !a) &&
+		    ((MAGIC_BUTTONS[15] == '1') ^ !b) &&
+		    ((MAGIC_BUTTONS[16] == '1') ^ !select) &&
+		    ((MAGIC_BUTTONS[17] == '1') ^ !start) &&
+		    ((MAGIC_BUTTONS[18] == '1') ^ !up) &&
+		    ((MAGIC_BUTTONS[19] == '1') ^ !down) &&
+		    ((MAGIC_BUTTONS[20] == '1') ^ !left) &&
+		    ((MAGIC_BUTTONS[21] == '1') ^ !right);
+
+		// Start button workaroud for second controller on Famicom
+		if (MAGIC_FC_START[15] == '1' && info->id == 2)
+		{
+		    if (a && !select && b && !start && up && !down && !left && !right)
+			info->start_counter++;
+		    else
+			info->start_counter = 0;
+		    if (info->start_counter >= START_COMBINATION_THRESHOLD)
+			start = 1;
+		}
+
+		// Autofire
+		if (MAGIC_AUTOFIRE[15] == '1')
+		{
+		    info->autofire_timer++;
+		    if (info->autofire_timer >= AUTOFIRE_INTERVAL*2)
+			info->autofire_timer = 0;
+		    turbo = info->autofire_timer / AUTOFIRE_INTERVAL;
+
+		    if (a && select && !b && !start && !up && !down && !left && !right)
+			info->autofire_counter_a++;
+		    else
+			info->autofire_counter_a = 0;
+		    if (!a && select && b && !start && !up && !down && !left && !right)
+			info->autofire_counter_b++;
+		    else
+			info->autofire_counter_b = 0;
+
+		    if (info->autofire_counter_a == AUTOFIRE_COMBINATION_THRESHOLD)
+			info->autofire_a = !info->autofire_a;
+		    if (info->autofire_counter_b == AUTOFIRE_COMBINATION_THRESHOLD)
+			info->autofire_b = !info->autofire_b;
+
+		    if (info->autofire_a && !turbo) a = 0;
+		    if (info->autofire_b && !turbo) b = 0;
+
+		    // X and Y on classic controller now are autofire A and B
+		    if (x && turbo) a = 1;
+		    if (y && turbo) b = 1;
+		    x = y = 0;
+		}
+
+		/* When DC noise is kicking in, we want to avoid the emulator
+		 * switching to the menu supriously because of noisy home button
+		 * events.
+		 *
+		 * Note that even the Mini NES controller can report the event
+		 * even though no physical button is present. The MCU is the
+		 * same as the classic/pro controller. */
+		if (home) {
+			info->home_counter++;
+			if (info->home_counter>HOME_BUTTON_THRESHOLD) {
+				info->home_counter = HOME_BUTTON_THRESHOLD;
+			}
+		} else {
+			info->home_counter = 0;
+		}
+		if (reset) {
+			info->reset_counter++;
+			if (info->reset_counter>RESET_COMBINATION_THRESHOLD) {
+				info->reset_counter = RESET_COMBINATION_THRESHOLD;
+			}
+		} else {
+			info->reset_counter = 0;
+		}
+
+		input_report_key(polled_dev->input, BTN_TR,     r);
+		input_report_key(polled_dev->input, BTN_START,  start);
+		input_report_key(polled_dev->input, BTN_MODE,   (info->home_counter>=HOME_BUTTON_THRESHOLD) || (info->reset_counter>=RESET_COMBINATION_THRESHOLD));
+		input_report_key(polled_dev->input, BTN_SELECT, select);
+		input_report_key(polled_dev->input, BTN_TL,     l);
+		input_report_key(polled_dev->input, BTN_TRIGGER_HAPPY4,  down);
+		input_report_key(polled_dev->input, BTN_TRIGGER_HAPPY2,  right);
+		input_report_key(polled_dev->input, BTN_TRIGGER_HAPPY3,  up);
+		input_report_key(polled_dev->input, BTN_TRIGGER_HAPPY1,  left);
+		input_report_key(polled_dev->input, BTN_TR2,    zr);
+		input_report_key(polled_dev->input, BTN_X,      x);
+		input_report_key(polled_dev->input, BTN_A,      a);
+		input_report_key(polled_dev->input, BTN_Y,      y);
+		input_report_key(polled_dev->input, BTN_B,      b);
+		input_report_key(polled_dev->input, BTN_TL2,    zl);
+
+		input_sync(polled_dev->input);
+
+		break;
+	case CS_RETRY_1:
+		retry_delay /= 2;
+		//fall-through
+	case CS_RETRY_2:
+		retry_delay /= 2;
+		//fall-through
+	case CS_ERR:
+		info->retry_counter++;
+		if (info->retry_counter == retry_delay) {
+			DBG("retrying controller setup");
+			ret = clovercon_setup(info->client);
+			if (ret) {
+				info->state = MIN(CS_ERR, info->state + 1);
+			} else {
+				info->state = CS_OK;
+				INF("setup succeeded for controller %i, moving to OK state", info->id);
+			}
+			info->retry_counter = 0;
+		}
+		break;
+	default:
+		info->state = CS_ERR;
+	}
+}
+
+static void clovercon_open(struct input_polled_dev *polled_dev) {
+	struct clovercon_info *info = polled_dev->private;
+	if (clovercon_setup(info->client)) {
+		info->retry_counter = 0;
+		info->state = CS_RETRY_1;
+		INF("opened controller %i, controller in error state after failed setup", info->id);
+	} else {
+		info->state = CS_OK;
+		info->home_counter = 0;
+		info->reset_counter = 0;
+		INF("opened controller %i, controller in OK state", info->id);
+	}
+}
+
+static int clovercon_probe(struct i2c_client *client, const struct i2c_device_id *id) {
+	struct clovercon_info *info;
+	struct input_polled_dev *polled_dev;
+	struct input_dev *input_dev;
+	int ret = 0;
+
+	switch (id->driver_data) {
+	case CLASSIC_ID:
+		DBG("probing classic controller");
+		break;
+	default:
+		ERR("unknown id: %lu\n", id->driver_data);
+		return -EINVAL;
+	}
+
+	mutex_lock(&con_state_lock);
+	info = clovercon_info_from_adapter(client->adapter);
+	if (!info) {
+		ERR("unkonwn client passed to probe");
+		mutex_unlock(&con_state_lock);
+		return -EINVAL;
+	}
+	info->client = client;
+	i2c_set_clientdata(client, info);
+	mutex_unlock(&con_state_lock);
+
+	polled_dev = input_allocate_polled_device();
+	if (!polled_dev) {
+		ERR("error allocating polled device");
+		return -ENOMEM;
+	}
+
+	info->dev = polled_dev;
+
+	polled_dev->poll_interval = POLL_INTERVAL;
+	polled_dev->poll = clovercon_poll;
+	polled_dev->open = clovercon_open;
+	polled_dev->private = info;
+
+	input_dev = polled_dev->input;
+
+	//change controller_names initializer when changing MAX_CON_COUNT
+	BUILD_BUG_ON(MAX_CON_COUNT != ARRAY_SIZE(controller_names)); 
+	input_dev->name = controller_names[info->id - 1];
+	input_dev->phys = DRV_NAME"/clovercon";
+	input_dev->id.bustype = BUS_I2C;
+	input_dev->dev.parent = &client->dev;
+
+	set_bit(EV_ABS, input_dev->evbit);
+	set_bit(ABS_X,  input_dev->absbit);
+	set_bit(ABS_Y,  input_dev->absbit);
+	set_bit(ABS_RX, input_dev->absbit);
+	set_bit(ABS_RY, input_dev->absbit);
+	/*
+	L/R are analog on the classic controller, digital
+	on the pro with values 0 - 0xf8
+	*/
+	set_bit(ABS_Z,  input_dev->absbit);
+	set_bit(ABS_RZ, input_dev->absbit);
+
+	set_bit(EV_KEY,     input_dev->evbit);
+	set_bit(BTN_X,      input_dev->keybit);
+	set_bit(BTN_B,      input_dev->keybit);
+	set_bit(BTN_A,      input_dev->keybit);
+	set_bit(BTN_Y,      input_dev->keybit);
+	set_bit(BTN_TRIGGER_HAPPY3, input_dev->keybit); // up
+	set_bit(BTN_TRIGGER_HAPPY4, input_dev->keybit); // down
+	set_bit(BTN_TRIGGER_HAPPY2, input_dev->keybit); // right
+	set_bit(BTN_TRIGGER_HAPPY1, input_dev->keybit); // left
+	set_bit(BTN_TR,     input_dev->keybit);
+	set_bit(BTN_TL,     input_dev->keybit);
+	set_bit(BTN_TR2,    input_dev->keybit);
+	set_bit(BTN_TL2,    input_dev->keybit);
+	set_bit(BTN_SELECT, input_dev->keybit);
+	set_bit(BTN_START,  input_dev->keybit);
+	set_bit(BTN_MODE,   input_dev->keybit);
+
+	input_set_abs_params(input_dev, ABS_X,  -STICK_MAX, STICK_MAX, STICK_FUZZ, 0);
+	input_set_abs_params(input_dev, ABS_Y,  -STICK_MAX, STICK_MAX, STICK_FUZZ, 0);
+	input_set_abs_params(input_dev, ABS_RX, -STICK_MAX, STICK_MAX, STICK_FUZZ, 0);
+	input_set_abs_params(input_dev, ABS_RY, -STICK_MAX, STICK_MAX, STICK_FUZZ, 0);
+	input_set_abs_params(input_dev, ABS_Z,  TRIGGER_MIN, TRIGGER_MAX, TRIGGER_FUZZ, 0);
+	input_set_abs_params(input_dev, ABS_RZ, TRIGGER_MIN, TRIGGER_MAX, TRIGGER_FUZZ, 0);
+
+	ret = input_register_polled_device(polled_dev);
+	if (ret) {
+		ERR("registering polled device failed");
+		goto err_register_polled_dev;
+	}
+
+	INF("probed controller %i", info->id);
+
+	return 0;
+
+err_register_polled_dev:
+	input_free_polled_device(polled_dev);
+
+	return ret;
+}
+
+static int clovercon_remove(struct i2c_client *client) {
+	struct clovercon_info *info;
+	struct input_polled_dev *polled_dev;
+	
+	mutex_lock(&con_state_lock);
+	info = i2c_get_clientdata(client);
+	polled_dev = info->dev;
+	info->dev = NULL;
+	mutex_unlock(&con_state_lock);
+
+	input_unregister_polled_device(polled_dev);
+	input_free_polled_device(polled_dev);
+
+	INF("removed controller %i", info->id);
+
+	return 0;
+}
+
+static struct i2c_driver clovercon_driver = {
+	.driver = {
+		.name	= "clovercon",
+		.owner = THIS_MODULE,
+	},
+
+	.id_table	= clovercon_idtable,
+	.probe		= clovercon_probe,
+	.remove		= clovercon_remove,
+};
+
+static struct i2c_board_info clovercon_i2c_board_info = {
+	I2C_BOARD_INFO("classic", CONTROLLER_I2C_ADDRESS),
+};
+
+/* Must be holding con_state_lock */
+int clovercon_add_controller(struct clovercon_info *info) {
+	struct i2c_client *client;
+
+	mutex_unlock(&con_state_lock);
+	client = i2c_new_device(info->adapter, &clovercon_i2c_board_info);
+	mutex_lock(&con_state_lock);
+	if (!client) {
+		ERR("could not create i2c device");
+		return -ENOMEM;
+	}
+
+	INF("added device for controller %i", info->id);
+	return 0;
+}
+
+/* Must be holding con_state_lock */
+void clovercon_remove_controller(struct clovercon_info *info) {
+	struct i2c_client *client = info->client;
+
+	mutex_unlock(&con_state_lock);
+	i2c_unregister_device(client);
+	mutex_lock(&con_state_lock);
+	info->client = NULL;
+
+	INF("removed device for controller %i", info->id);
+}
+
+static void clovercon_remove_controllers(void) {
+	int i;
+
+	mutex_lock(&con_state_lock);
+	for (i = 0; i < arr_argc / 2; i++) {
+		if (!con_info_list[i].client) {
+			continue;
+		}
+		clovercon_remove_controller(&con_info_list[i]);
+	}
+	mutex_unlock(&con_state_lock);
+}
+
+static void clovercon_detect_task(struct work_struct *dummy) {
+	struct clovercon_info *info;
+	int i;
+	int val;
+
+	mutex_lock(&detect_task_lock);
+	DBG("detect task running");
+	mutex_lock(&con_state_lock);
+	for (i = 0; i < MAX_CON_COUNT; i++) {
+		info = &con_info_list[i];
+		if (!info->detection_active) {
+			continue;
+		}
+		val = gpio_get_value(info->gpio);
+		DBG("detect pin value: %i", val);
+		if (val && !info->client) {
+			DBG("detect task adding controller %i", i);
+			clovercon_add_controller(info);
+		} else if (!val && info->client) {
+			DBG("detect task removing controller %i", i);
+			clovercon_remove_controller(info);
+		}
+	}
+	mutex_unlock(&con_state_lock);
+	mutex_unlock(&detect_task_lock);
+	DBG("detect task done");
+}
+
+#if CLOVERCON_DETECT_USE_IRQ
+
+static irqreturn_t clovercon_detect_interrupt(int irq, void* dummy) {
+	struct clovercon_info *info = clovercon_info_from_irq(irq);
+	static int initialized = 0;
+
+	if (info == NULL) {
+		FAST_ERR("could not find controller info associated with irq %i", irq);
+		return IRQ_HANDLED;
+	}
+
+	if (initialized == 0) {
+		INIT_DELAYED_WORK(&detect_work, clovercon_detect_task);
+		initialized = 1;
+	} else {
+		PREPARE_DELAYED_WORK(&detect_work, clovercon_detect_task);
+	}
+
+	schedule_delayed_work(&detect_work, DETECT_DELAY);
+
+	FAST_DBG("interrupt handler on int %i", irq);
+	return IRQ_HANDLED;
+}
+
+static int clovercon_setup_irq_detect(struct clovercon_info *info) {
+	int irq;
+	int ret;
+
+	ret = gpio_to_irq(info->gpio);
+	if (ret < 0) {
+		ERR("gpio to irq failed");
+		return ret;
+	} else {
+		irq = ret;
+		DBG("irq for gpio %i: %i", info->gpio, irq);
+	}
+
+	mutex_lock(&con_state_lock);
+	info->irq = irq;
+	info->detection_active = 1;
+	mutex_unlock(&con_state_lock);
+
+	ret = request_irq(ret, clovercon_detect_interrupt, IRQ_TYPE_EDGE_BOTH, "clovercon", NULL);
+	if (ret) {
+		ERR("failed to request irq");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void clovercon_teardown_irq_detect(struct clovercon_info *info) {
+	free_irq(info->irq, NULL);
+	mutex_lock(&con_state_lock);
+	info->detection_active = 0;
+	info->irq = INVAL_IRQ;
+	mutex_unlock(&con_state_lock);
+}
+
+#else //CLOVERCON_DETECT_USE_IRQ
+
+static void clovercon_detect_timer_task(struct work_struct *dummy) {
+	static int initialized = 0;
+
+	if (initialized == 0) {
+		INIT_DELAYED_WORK(&detect_work, clovercon_detect_timer_task);
+		initialized = 1;
+	} else {
+		PREPARE_DELAYED_WORK(&detect_work, clovercon_detect_timer_task);
+	}
+
+	clovercon_detect_task(NULL);
+	schedule_delayed_work(&detect_work, DETECT_DELAY);
+}
+
+static int clovercon_setup_timer_detect(struct clovercon_info *info) {
+	static int task_running = 0;
+
+	mutex_lock(&con_state_lock);
+	info->detection_active = 1;
+	mutex_unlock(&con_state_lock);
+	
+	if (task_running)
+		return 0;
+
+	task_running = 1;
+	clovercon_detect_timer_task(NULL);
+
+	return 0;
+}
+
+static void clovercon_teardown_timer_detect(struct clovercon_info *info) {
+	mutex_lock(&con_state_lock);
+	info->detection_active = 0;
+	mutex_unlock(&con_state_lock);
+}
+
+#endif //CLOVERCON_DETECT_USE_IRQ
+
+static int clovercon_setup_i2c(struct clovercon_info *info, int i2c_bus) {
+	struct i2c_adapter *adapter;
+
+	adapter = i2c_get_adapter(i2c_bus);
+	if (!adapter) {
+		ERR("could not access i2c bus %i", i2c_bus);
+		return -EINVAL;
+	}
+
+	info->adapter = adapter;
+
+	return 0;
+}
+
+static int clovercon_setup_detection(struct clovercon_info *info, int gpio_pin) {
+	int ret;
+
+	ret = gpio_request(gpio_pin, "clovercon_detect");
+	if (ret) {
+		ERR("gpio request failed for pin %i", gpio_pin);
+		return ret;
+	}
+
+	ret = gpio_direction_input(gpio_pin);
+	if (ret) {
+		ERR("gpio input direction failed");
+		goto err_gpio_cleanup;
+	}
+
+	info->gpio = gpio_pin;
+
+	ret = gpio_set_debounce(gpio_pin, DEBOUNCE_VALUE);
+	if (ret) {
+		ERR("failed to debounce gpio %i", gpio_pin);
+		goto err_gpio_cleanup;
+	}
+
+#if CLOVERCON_DETECT_USE_IRQ
+	info->irq = INVAL_IRQ;
+	ret = clovercon_setup_irq_detect(info);
+#else
+	ret = clovercon_setup_timer_detect(info);
+#endif
+
+	if (ret) {
+		ERR("controller detection setup failed");
+		goto err_detect_cleanup;
+	}
+
+	return 0;
+
+err_detect_cleanup:
+#if CLOVERCON_DETECT_USE_IRQ
+	clovercon_teardown_irq_detect(info);
+#else
+	clovercon_teardown_timer_detect(info);
+#endif
+
+err_gpio_cleanup:
+	gpio_free(gpio_pin);
+	return ret;
+}
+
+static void clovercon_teardown_detection(void) {
+	int i;
+	int gpio;
+
+	cancel_delayed_work_sync(&detect_work);
+
+	for (i = 0; i < MAX_CON_COUNT; i++) {
+		if (!con_info_list[i].detection_active) {
+			continue;
+		}
+#if CLOVERCON_DETECT_USE_IRQ
+		clovercon_teardown_irq_detect(&con_info_list[i]);
+#else
+		clovercon_teardown_timer_detect(&con_info_list[i]);
+#endif
+		mutex_lock(&con_state_lock);
+		con_info_list[i].adapter = NULL;
+		gpio = con_info_list[i].gpio;
+		mutex_unlock(&con_state_lock);
+
+		DBG("Freeing gpio %i", gpio);
+		gpio_free(gpio);
+	}
+}
+
+static int __init clovercon_init(void) {
+	int i2c_bus;
+	int gpio_pin;
+	int ret;
+	int i;
+
+	for (i = 0; i < MAX_CON_COUNT; i++) {
+		con_info_list[i].detection_active = 0;
+		con_info_list[i].id = i + 1;
+	}
+
+	for (i = 0; i < arr_argc / 2; i++) {
+		i2c_bus = module_params[2 * i];
+		gpio_pin = module_params[2 * i + 1];
+
+		DBG("initializing controller %i on bus %i, gpio %i", i, i2c_bus, gpio_pin);
+
+		ret = clovercon_setup_i2c(&con_info_list[i], i2c_bus);
+		if (ret) {
+			ERR("failed to init controller %i", i);
+			goto err_controller_cleanup;
+		}
+
+		if (gpio_pin < 0) {
+			mutex_lock(&con_state_lock);
+			ret = clovercon_add_controller(&con_info_list[i]);
+			mutex_unlock(&con_state_lock);
+		} else {
+			ret = clovercon_setup_detection(&con_info_list[i], gpio_pin);
+			if (ret) {
+				ERR("failed to init controller %i", i);
+				goto err_controller_cleanup;
+			}
+		}
+	}
+
+	ret = i2c_add_driver(&clovercon_driver);
+	if (ret) {
+		ERR("failed to add driver");
+		goto err_controller_cleanup;
+	}
+
+	return 0;
+
+err_controller_cleanup:
+	clovercon_teardown_detection();
+	clovercon_remove_controllers();
+	return ret;
+}
+
+module_init(clovercon_init);
+
+static void __exit clovercon_exit(void) {
+	DBG("exit");
+
+	clovercon_teardown_detection();
+	clovercon_remove_controllers();
+	i2c_del_driver(&clovercon_driver);
+}
+
+module_exit(clovercon_exit);