/*
 * MTS-IO Controller
 *
 * Copyright (C) 2014 by Multi-Tech Systems
 * Copyright (C) 2016 by Multi-Tech Systems
 *
 * Authors: James Maki <jmaki@multitech.com>
 *          Jesse Gilles <jgilles@multitech.com>
 *          Mike Fiore <mfiore@multitech.com>
 *
 * 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/ioctl.h>
#include <linux/input.h>
#include <linux/cdev.h>
#include <linux/clk.h>
#include <linux/sched.h>
#include <linux/reboot.h>
#include <linux/uaccess.h>
#include <linux/gpio.h>
#include <linux/sched.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/bitops.h>
#include <linux/spi/spi.h>
#include <linux/i2c/at24.h>
#include <linux/kmod.h>
#include <linux/ctype.h>
#include <linux/io.h>
#include <linux/module.h>

#include "mts_io.h"

#define DRIVER_VERSION	"v1.3.7"
#define DRIVER_AUTHOR	"James Maki <jmaki@multitech.com>"
#define DRIVER_DESC	"MTS-IO Controller"
#define DRIVER_NAME	"mts-io"

#define PLATFORM_NAME	"mts-io"

#define LED_LS_CONTROLLABLE		0

/* on-board EEPROM */
extern uint8_t mts_id_eeprom[512];
static struct mts_id_eeprom_layout id_eeprom;

// NUM_AP should be defined from the board code
// it should be set to the value of CONFIG_MTS_NUM_ACCESSORY_PORTS
// arch/arm/mach-at91/board-dt-sam9.c
// if it is 0 or undefined, there is no accessory card support on this HW
#ifdef CONFIG_MTS_NUM_ACCESSORY_PORTS

#ifndef NUM_AP
#define NUM_AP CONFIG_MTS_NUM_ACCESSORY_PORTS
#endif

#else
#define NUM_AP 0
#endif

static uint8_t mts_hw_version;
static struct platform_device *mts_io_platform_device;
static struct attribute_group *attr_group;
static struct gpio_pin *gpio_pins;

static DEFINE_MUTEX(mts_io_mutex);

static unsigned int *timings_data = NULL;
static unsigned int timings_data_size = 0;
static unsigned int timings_data_index = 0;
static time_t timings_data_stop_seconds = 0;
static struct timer_list radio_reset_timer;
static volatile int radio_reset_timer_is_start = 0;
static struct timer_list radio_reset_available_timer;
static volatile int radio_reset_available_timer_is_start = 0;
static time_t time_now_secs(void);
static void radio_reset_available_timer_callback(unsigned long data);
static void radio_reset_timer_callback(unsigned long data);

/* generic GPIO support */
#include "gpio.c"

/* reset button handling */
#define RESET_CHECK_PER_SEC		8
#define RESET_INTERVAL		(HZ / RESET_CHECK_PER_SEC)
#define RESET_HOLD_COUNT	(RESET_CHECK_PER_SEC * 3)
#define RESET_LONG_HOLD_COUNT   (RESET_CHECK_PER_SEC * 30)

static pid_t reset_pid = -1;
static pid_t reset_count = 0;
bool sent_extra_long = false;
static int reset_short_signal = SIGUSR1;
static int reset_long_signal = SIGUSR2;
static int reset_extra_long_signal = SIGHUP;
static int reset_short_interval = RESET_HOLD_COUNT;
static int reset_long_interval = RESET_LONG_HOLD_COUNT;

static void reset_callback(struct work_struct *ignored);

static DECLARE_DELAYED_WORK(reset_work, reset_callback);

static void reset_callback(struct work_struct *ignored)
{
	struct gpio_pin *pin;
	int reset_pressed = 0;
	struct pid *vpid = NULL;

	mutex_lock(&mts_io_mutex);

	pin = gpio_pin_by_name("DEVICE_RESET");
	if (pin) {
		reset_pressed = !gpio_get_value(pin->pin.gpio);
	}

	if (reset_pid > 0) {
		vpid = find_vpid(reset_pid);
	}

	if (vpid) {
		if (reset_pressed) {
			reset_count++;
		} else {
			//Reset button has not been pressed
			if (reset_count > 0 && reset_count < reset_short_interval) {
				kill_pid(vpid, reset_short_signal, 1);
			} else if (reset_count >= reset_short_interval && reset_count < reset_long_interval) {
				kill_pid(vpid, reset_long_signal, 1);
			}

			reset_count = 0;
			sent_extra_long = false;
		}
		if (reset_count >= reset_long_interval && ! sent_extra_long) {
			kill_pid(vpid, reset_extra_long_signal, 1);
			sent_extra_long = true;
		}
	} else {
		reset_count = 0;
	}

	mutex_unlock(&mts_io_mutex);

	schedule_delayed_work(&reset_work, RESET_INTERVAL);
}

static ssize_t mts_attr_show_reset_monitor_intervals(struct device *dev, struct device_attribute *attr, char *buf)
{
	int ret;

	mutex_lock(&mts_io_mutex);

	ret = sprintf(buf, "%d %d\n", reset_short_interval / RESET_CHECK_PER_SEC, reset_long_interval / RESET_CHECK_PER_SEC);

	mutex_unlock(&mts_io_mutex);

	return ret;
}

static ssize_t mts_attr_store_reset_monitor_intervals(struct device *dev, struct device_attribute *attr, char *buf, size_t count)
{
	int short_int;
	int long_int;

	if (sscanf(buf, "%i %i", &short_int, &long_int) != 2) {
		return -EINVAL;
	}

	mutex_lock(&mts_io_mutex);

	reset_short_interval = short_int * RESET_CHECK_PER_SEC;
	reset_long_interval = long_int * RESET_CHECK_PER_SEC;

	mutex_unlock(&mts_io_mutex);

	return count;
}

static DEVICE_ATTR_MTS(dev_attr_reset_monitor_intervals, "reset-monitor-intervals",
	mts_attr_show_reset_monitor_intervals, mts_attr_store_reset_monitor_intervals);

static ssize_t mts_attr_show_reset_monitor(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	int ret;

	mutex_lock(&mts_io_mutex);

	ret = sprintf(buf, "%d %d %d %d\n", reset_pid, reset_short_signal, reset_long_signal, reset_extra_long_signal);

	mutex_unlock(&mts_io_mutex);

	return ret;
}

static ssize_t mts_attr_store_reset_monitor(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	pid_t pid;
	int short_signal;
	int long_signal;
	int extra_long_signal;
	int result = sscanf(buf, "%i %i %i %i", &pid, &short_signal, &long_signal, &extra_long_signal);

	if (result < 3 || result > 4) {
		return -EINVAL;
	}

        if(result == 3) {
		mutex_lock(&mts_io_mutex);

		reset_pid = pid;
		reset_short_signal = short_signal;
		reset_long_signal = long_signal;

		mutex_unlock(&mts_io_mutex);
	} else {
		mutex_lock(&mts_io_mutex);

		reset_pid = pid;
		reset_short_signal = short_signal;
		reset_long_signal = long_signal;
		reset_extra_long_signal = extra_long_signal;

		mutex_unlock(&mts_io_mutex);
	}

	return count;
}

static DEVICE_ATTR_MTS(dev_attr_reset_monitor, "reset-monitor",
	mts_attr_show_reset_monitor, mts_attr_store_reset_monitor);
static DEVICE_ATTR_RO_MTS(dev_attr_reset, "reset", mts_attr_show_gpio_pin);

/* active-low socket modem reset */
static ssize_t mts_attr_store_radio_reset(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	int value;
	int err;
	struct gpio_pin *pin;

	if (sscanf(buf, "%i", &value) != 1) {
		return -EINVAL;
	}
	if (value != 0) {
		return -EINVAL;
	}

	/* check reset timings is enabled */
	if (NULL != timings_data) {
		/* check reset timer is started */
		if (radio_reset_timer_is_start == 1) {
			log_info("radio reset timer is running. \n");
			return count;
		}

		/* check reset timer available is started */
		if (radio_reset_available_timer_is_start == 1) {
			del_timer(&radio_reset_available_timer);
			radio_reset_available_timer_is_start = 0;
		}

		/* reset timer not started, start it */
		mod_timer(&radio_reset_timer, jiffies + msecs_to_jiffies((timings_data[timings_data_index]) * 1000));
		//log_info("radio reset timer is start = [%d]\n", time_now_secs());
		/* save timings_data_stop_seconds */
		timings_data_stop_seconds = timings_data[timings_data_index] + time_now_secs();
		radio_reset_timer_is_start = 1;
	}

	log_info("radio is reset\n");

	pin = gpio_pin_by_name("RADIO_RESET");

	if (!pin) {
		return -ENODEV;
	}

	mutex_lock(&mts_io_mutex);

	// 250ms low reset
	err = reset_gpio_pin(pin, 250, 0);

	mutex_unlock(&mts_io_mutex);

	if (err) {
		return err;
	}

	return count;
}

static DEVICE_ATTR_MTS(dev_attr_radio_reset, "radio-reset",
	mts_attr_show_gpio_pin, mts_attr_store_radio_reset);

/* shared gpio attributes */
static DEVICE_ATTR_MTS(dev_attr_radio_power, "radio-power",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);

/* backoff-timers */
static time_t time_now_secs(void)
{
	struct timespec ts = current_kernel_time();
	return ts.tv_sec;
}

static void radio_reset_available_timer_callback( unsigned long data )
{
	/* do your timer stuff here */
	//log_info("radio_reset_available_timer_callback\n");
	//log_info("radio reset available timer is stop = [%d]\n", time_now_secs());

	/* zero timings_data_index */
	timings_data_index = 0;
	//log_info("timings data index is zero = [%d]\n", timings_data_index);
	radio_reset_available_timer_is_start = 0;
}

static void radio_reset_timer_callback( unsigned long data )
{
	/* do your timer stuff here */
	//log_info("radio_reset_timer_callback\n");
	//log_info("radio reset timer is stop = [%d]\n", time_now_secs());

	/* increment timings_data_index */
	timings_data_index++;
	if(timings_data_index >= timings_data_size) {
		timings_data_index = timings_data_size-1;
	}

	//log_info("timings data index = [%d]\n", timings_data_index);

	/* reset available timer not started, start it */
	mod_timer(&radio_reset_available_timer, jiffies + msecs_to_jiffies((timings_data[timings_data_index]) * 1000));
	//log_info("radio reset available timer is start = [%d]\n", time_now_secs());
	radio_reset_available_timer_is_start = 1;
	radio_reset_timer_is_start = 0;
}

static ssize_t mts_attr_store_radio_reset_backoffs(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	char *timings_data_str = NULL;
	const char delimiter[] = " ";
	char * pch = NULL;
	unsigned int size = 0;

	/* free previous timings_data */
	if (NULL != timings_data) {
		/* stop timers */
		del_timer(&radio_reset_timer);
		del_timer(&radio_reset_available_timer);
		timings_data_index = 0;
		radio_reset_timer_is_start = 0;
		radio_reset_available_timer_is_start = 0;

		//log_info("free previous timings_data\n");
		kfree(timings_data);
		timings_data = NULL;
		timings_data_size = 0;
	}

	/* make a copy */
	if( NULL == (timings_data_str = kzalloc((strlen(buf) + 1), GFP_KERNEL)) ){
		log_error("can`t allocate memory\n");
		return -EINVAL;
	}

        //log_info("radio_reset_backoffs buf: [%s]", buf);
        strncpy(timings_data_str, buf, (strlen(buf) + 1));

	/* get number of tokens */
	while (NULL != (pch = strsep (&timings_data_str, delimiter))) {
		int value = 0;
		sscanf(pch, "%d", &value);
	        //log_info("radio reset backoffs pch = [%s]\n", pch);
		if (value > 0){
			size++;
			if (NULL == timings_data) {
				/* make alloc */
				if (NULL == (timings_data = kmalloc(sizeof(unsigned int), GFP_KERNEL))) {
					log_error("radio reset backoffs can`t allocate memory\n");
					goto free;
				}
			} else {
				/* make realloc */
				if (NULL == (timings_data = krealloc(timings_data, size * sizeof(unsigned int), GFP_KERNEL))) {
					log_error("radio reset backoffs can`t allocate memory\n");
					goto free;
				}
			}
			/* save timings data */
			sscanf(pch, "%d", &timings_data[size-1]);
		}
	}

	timings_data_size = size;
	//log_info("timings_data_size = %d\n", timings_data_size);

	if (NULL != timings_data_str) {
		/* free timings_data_str */
                /* never get here in happy path */
		kfree(timings_data_str);
	}
	return count;

free:
	if (NULL != timings_data_str) {
		/* free timings_data_str */
		kfree(timings_data_str);
	}

	if (NULL != timings_data) {
		kfree(timings_data);
		timings_data = NULL;
		timings_data_size = 0;
	}
	return -EINVAL;
}

static ssize_t mts_attr_store_radio_reset_backoffs_index(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	int value;

	if (sscanf(buf, "%d", &value) != 1) {
		return -EINVAL;
	}

	if ((value < 0) || (value >= timings_data_size)) {
		log_error("incorrect data\n");
		return -EINVAL;
	}

	/* stop timers */
	del_timer(&radio_reset_timer);
	del_timer(&radio_reset_available_timer);
	radio_reset_timer_is_start = 0;
	radio_reset_available_timer_is_start = 0;
	timings_data_index = value;

	return count;
}

static ssize_t mts_attr_show_radio_reset_backoffs(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	int ret = 0;
	size_t i = 0;
        size_t buf_left = 0;

	if (NULL != timings_data) {
		for(i = 0; i < timings_data_size; ++i) {
                        buf_left = PAGE_SIZE - ret;
			ret += snprintf(buf += strlen(buf), buf_left, "%d ", timings_data[i]);
		}
	}
	
        if (ret > 0) {
		ret -= 1;
	}

	return ret;
}

static ssize_t mts_attr_show_radio_reset_backoff_index(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	ssize_t value;

	if (strcmp(attr->attr.name, "radio-reset-backoff-index") == 0) {
		value = sprintf(buf, "%d", timings_data_index);
	}
	else {
		log_error("attribute '%s' not found", attr->attr.name);
		value = -1;
	}

	return value;
}

static ssize_t mts_attr_show_radio_reset_backoff_seconds(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	ssize_t value;

	if (strcmp(attr->attr.name, "radio-reset-backoff-seconds") == 0) {
		if (radio_reset_timer_is_start == 1) {
			value = sprintf(buf, "%lu",  (timings_data_stop_seconds - time_now_secs()));
		} else {
			value = sprintf(buf, "%d", 0);
		}
	} else {
		log_error("attribute '%s' not found", attr->attr.name);
		value = -1;
	}

	return value;
}

static DEVICE_ATTR_MTS(dev_attr_radio_reset_backoffs, "radio-reset-backoffs",
	mts_attr_show_radio_reset_backoffs, mts_attr_store_radio_reset_backoffs);

static DEVICE_ATTR_MTS(dev_attr_radio_reset_backoff_index, "radio-reset-backoff-index",
	mts_attr_show_radio_reset_backoff_index, mts_attr_store_radio_reset_backoffs_index);

static DEVICE_ATTR_RO_MTS(dev_attr_radio_reset_backoff_seconds, "radio-reset-backoff-seconds",
	mts_attr_show_radio_reset_backoff_seconds);

/* shared gpio-based LEDs */
static DEVICE_ATTR_MTS(dev_attr_led_status, "led-status",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);
static DEVICE_ATTR_MTS(dev_attr_led_a_gpio, "led-a",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);

#if LED_LS_CONTROLLABLE
static DEVICE_ATTR_MTS(dev_attr_led_ls, "led-ls",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);
#else
static DEVICE_ATTR_RO_MTS(dev_attr_led_ls, "led-ls",
	mts_attr_show_gpio_pin);
#endif

static DEVICE_ATTR_MTS(dev_attr_led_b_gpio, "led-b",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);

static DEVICE_ATTR_MTS(dev_attr_led_cd_gpio, "led-cd",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);
static DEVICE_ATTR_MTS(dev_attr_led_c_gpio, "led-c",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);

static DEVICE_ATTR_MTS(dev_attr_led_sig1_gpio, "led-sig1",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);
static DEVICE_ATTR_MTS(dev_attr_led_sig2_gpio, "led-sig2",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);
static DEVICE_ATTR_MTS(dev_attr_led_sig3_gpio, "led-sig3",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);

static DEVICE_ATTR_MTS(dev_attr_led_d_gpio, "led-d",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);
static DEVICE_ATTR_MTS(dev_attr_led_e_gpio, "led-e",
	mts_attr_show_gpio_pin, mts_attr_store_gpio_pin);

/* eeprom info */
static ssize_t mts_attr_show_product_info(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	int i;
	ssize_t value;
	
	if (strcmp(attr->attr.name, "vendor-id") == 0) {
		value = sprintf(buf, "%.32s\n", id_eeprom.vendor_id);
	} else if (strcmp(attr->attr.name, "product-id") == 0) {
		value = sprintf(buf, "%.32s\n", id_eeprom.product_id);
	} else if (strcmp(attr->attr.name, "device-id") == 0) {
		value = sprintf(buf, "%.32s\n", id_eeprom.device_id);
	} else if (strcmp(attr->attr.name, "uuid") == 0) {
		//Loop Through UUID Bytes and print them in HEX

		for(i = 0; i < 16; i++) {
			value = sprintf(buf, "%02X", id_eeprom.uuid[i]);
			if(value == -1) {
				return value;
			}
			buf += value;
		}
		value = sprintf(buf, "\n");
		if(value == -1) {
			return value;
		}
		value = 33;	//16*2 (ASCII HEX) + 1 ('\n')
	} else if (strcmp(attr->attr.name, "hw-version") == 0) {
		value = sprintf(buf, "%.32s\n", id_eeprom.hw_version);
	} else if (strcmp(attr->attr.name, "imei") == 0) {
		value = sprintf(buf, "%.32s\n", id_eeprom.imei);
	} else if (strcmp(attr->attr.name, "mac-eth") == 0) {
		value = sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X\n",
			id_eeprom.mac_addr[0],
			id_eeprom.mac_addr[1],
			id_eeprom.mac_addr[2],
			id_eeprom.mac_addr[3],
			id_eeprom.mac_addr[4],
			id_eeprom.mac_addr[5]);
	} else {
		log_error("attribute '%s' not found", attr->attr.name);
		value = -1;
	}

	return value;
}

static DEVICE_ATTR_RO_MTS(dev_attr_vendor_id, "vendor-id",
	mts_attr_show_product_info);
static DEVICE_ATTR_RO_MTS(dev_attr_product_id, "product-id",
	mts_attr_show_product_info);
static DEVICE_ATTR_RO_MTS(dev_attr_device_id, "device-id",
	mts_attr_show_product_info);
static DEVICE_ATTR_RO_MTS(dev_attr_uuid, "uuid",
	mts_attr_show_product_info);
static DEVICE_ATTR_RO_MTS(dev_attr_hw_version, "hw-version",
	mts_attr_show_product_info);
static DEVICE_ATTR_RO_MTS(dev_attr_imei, "imei",
	mts_attr_show_product_info);
static DEVICE_ATTR_RO_MTS(dev_attr_eth_mac, "mac-eth",
	mts_attr_show_product_info);

/* include per-device pins and attributes */
#include "mtcdt.c"
#include "mtp.c"

#if NUM_AP > 0

/* accessory card EEPROMs */
extern uint8_t mts_ap_eeprom[NUM_AP][512];
static struct mts_ap_eeprom_layout ap_eeprom[NUM_AP];
/* kobject pointers for the apX subdirectories that correspond to the accessory ports */
static struct kobject *ap_subdirs[NUM_AP];
/* attribute groups for the accessory ports*/
static struct attribute_group ap_attr_groups[NUM_AP];
/* info for accessory port (contains function pointers for setup and teardown and and useful info) */
static struct ap_info* port_info[NUM_AP];

/* accessory card support */
#include "mtac.c"
#include "mtac_gpiob.c"
#include "mtac_mfser.c"
#include "mtac_eth.c"
#include "mtac_lora.c"

static bool load_port(int port) {
	int port_index = port - 1;
	memcpy(&ap_eeprom[port_index], mts_ap_eeprom[port_index], sizeof(mts_ap_eeprom[port_index]));

	if (mts_ap_eeprom[port_index][0] == 0xFF) {
		log_error("uninitialized eeprom on accessory card %d", port);
	} else if (mts_ap_eeprom[port_index][0] == 0x00) {
		log_info("no accessory card inserted in port %d", port);
	} else {
		port_info[port_index] = kzalloc(sizeof(struct ap_info), GFP_KERNEL);
		if (! port_info[port_index]) {
			log_error("alloc of port info failed");
			return false;
		}

		if (strstr(ap_eeprom[port_index].product_id, PRODUCT_ID_MTAC_GPIOB)) {
			if (! set_gpiob_info(port_info[port_index])) {
				log_error("failed to set up gpiob port info");
				return false;
			}
		} else if (strstr(ap_eeprom[port_index].product_id, PRODUCT_ID_MTAC_MFSER)) {
			if (! set_mfser_info(port_info[port_index])) {
				log_error("failed to set up mfser port info");
				return false;
			}
		} else if (strstr(ap_eeprom[port_index].product_id, PRODUCT_ID_MTAC_ETH)) {
			if (! set_eth_info(port_info[port_index])) {
				log_error("failed to set up eth port info");
				return false;
			}
		} else if (strstr(ap_eeprom[port_index].product_id, PRODUCT_ID_MTAC_LORA)) {
			if (! set_lora_info(port_info[port_index])) {
				log_error("failed to set up lora port info");
				return false;
			}
		} else {
			log_error("unknown accessory card [%s] in port %d", ap_eeprom[port_index].product_id, port);
			kfree(port_info[port_index]);
			port_info[port_index] = NULL;
			return false;
		}

		log_info("accessory card %d vendor-id: %.32s", port, ap_eeprom[port_index].vendor_id);
		log_info("accessory card %d product-id: %.32s", port,  ap_eeprom[port_index].product_id);
		log_info("accessory card %d device-id: %.32s", port,  ap_eeprom[port_index].device_id);
		log_info("accessory card %d hw-version: %.32s", port,  ap_eeprom[port_index].hw_version);
		if (strncmp(ap_eeprom[port_index].product_id, PRODUCT_ID_MTAC_ETH, strlen(PRODUCT_ID_MTAC_ETH)) == 0) {
			log_info("accessory card %d mac-addr: %02X:%02X:%02X:%02X:%02X:%02X",
			    port,
			    ap_eeprom[port_index].mac_addr[0],
			    ap_eeprom[port_index].mac_addr[1],
			    ap_eeprom[port_index].mac_addr[2],
			    ap_eeprom[port_index].mac_addr[3],
			    ap_eeprom[port_index].mac_addr[4],
			    ap_eeprom[port_index].mac_addr[5]);
		}
		if (strncmp(ap_eeprom[port_index].product_id, PRODUCT_ID_MTAC_LORA, strlen(PRODUCT_ID_MTAC_LORA)) == 0) {
			log_info("accessory card %d eui: %02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X",
			    port,
			    ap_eeprom[port_index].eui[0],
			    ap_eeprom[port_index].eui[1],
			    ap_eeprom[port_index].eui[2],
			    ap_eeprom[port_index].eui[3],
			    ap_eeprom[port_index].eui[4],
			    ap_eeprom[port_index].eui[5],
			    ap_eeprom[port_index].eui[6],
			    ap_eeprom[port_index].eui[7]);
		}

		if (! port_info[port_index]->setup(port)) {
			log_error("accessory port %d setup failed", port);
			port_info[port_index]->teardown(port);
			kfree(port_info[port_index]);
			port_info[port_index] = NULL;
			return false;
		}
	}

	return true;
}

static void init_accessory_ports(void)
{
	int port_index;

	for (port_index = 0; port_index < NUM_AP; port_index++) {
        port_info[port_index] = NULL;
        if (! load_port(port_index+1)) {
            log_error("failed to load accessory card in port %d", port_index);
        }
    }
}

static void teardown_accessory_ports(void)
{
    int port_index;

    for (port_index = 0; port_index < NUM_AP; port_index++) {
        if (port_info[port_index]) {
            port_info[port_index]->teardown(port_index+1);
            kfree(port_info[port_index]);
        }
    }
}
#else /* NUM_AP > 0 */
static void init_accessory_ports(void) {}
static void teardown_accessory_ports(void) {}
#endif

struct attribute *freelater = NULL; // Storage to free when driver is unloaded.

static int mts_id_eeprom_load()
{
	int i;
	char buf[64] = {0};
	char* ptr;
	int attr_blength;     // Byte length of base attribute array
	int current_blength;  // Current length in bytes of attribute array
	int current_count;    // Number of items in array
	struct attribute **all_attrs = NULL;
	mts_hw_version = MTCDT_0_0;

	//The mts_id_eeprom buffer is initialize once on boot
	//reloading the mts_io.ko module will not reinitialize this buffer
	//only rebooting will reinitialize this buffer
	memcpy(&id_eeprom, mts_id_eeprom, sizeof(mts_id_eeprom));

	if (mts_id_eeprom[0] == 0xFF) {
		log_error("uninitialized eeprom");
		return -EIO;
	} else if (strncmp(id_eeprom.hw_version, HW_VERSION_MTP_0_0, strlen(HW_VERSION_MTP_0_0)) == 0)  {
		attr_group = &mtp_0_0_platform_attribute_group;
		gpio_pins = gpio_pins_mtp_0_0;
		mts_hw_version = MTP_0_0;
		log_info("detected board %s", HW_VERSION_MTP_0_0);
	}
	else if (strncmp(id_eeprom.hw_version, HW_VERSION_MTCDT_0_1, strlen(HW_VERSION_MTCDT_0_1)) == 0)  {
		attr_blength = sizeof  mtcdt_0_1_platform_attributes;
		if(DEVICE_CAPA(id_eeprom.capa, CAPA_WIFI_BT)) {
			attr_blength += sizeof mtcdt_0_1_wifi_bt_attributes;
		}
		if(DEVICE_CAPA(id_eeprom.capa, CAPA_GNSS)) {
			attr_blength += sizeof mtcdt_0_1_gnss_attributes;
		}
		if (attr_blength != sizeof mtcdt_0_1_platform_attributes) {
			freelater = all_attrs = kmalloc(attr_blength,GFP_KERNEL);
			current_blength = sizeof mtcdt_0_1_platform_attributes - sizeof (struct attribute *);
			current_count = current_blength/(sizeof (struct attribute *));
			memcpy(all_attrs,mtcdt_0_1_platform_attributes,current_blength);
			if(DEVICE_CAPA(id_eeprom.capa, CAPA_WIFI_BT)) {
				memcpy(all_attrs + current_count,mtcdt_0_1_wifi_bt_attributes,sizeof mtcdt_0_1_wifi_bt_attributes);
				current_count += sizeof mtcdt_0_1_wifi_bt_attributes / (sizeof  (struct attribute *));
			}
			if(DEVICE_CAPA(id_eeprom.capa, CAPA_GNSS)) {
				attr_blength += sizeof mtcdt_0_1_gnss_attributes;
				memcpy(all_attrs + current_count,mtcdt_0_1_gnss_attributes,sizeof mtcdt_0_1_gnss_attributes);
				current_count += sizeof mtcdt_0_1_gnss_attributes / (sizeof  (struct attribute *));
			}
			all_attrs[current_count] = (struct attribute *)NULL;
			mtcdt_0_1_platform_attribute_group.attrs = all_attrs;
		}

		attr_group = &mtcdt_0_1_platform_attribute_group;
		gpio_pins = gpio_pins_mtcdt_0_1;
		mts_hw_version = MTCDT_0_1;
		log_info("detected board %s", HW_VERSION_MTCDT_0_1);
	} else {
		attr_group = &mtcdt_platform_attribute_group;
		gpio_pins = gpio_pins_mtcdt_0_0;
		mts_hw_version = MTCDT_0_0;
		log_info("detected board %s", HW_VERSION_MTCDT_0_0);
	}

	log_info("sizeof: %lu", (unsigned long) sizeof(struct mts_id_eeprom_layout));
	log_info("vendor-id: %.32s", id_eeprom.vendor_id);
	log_info("product-id: %.32s",  id_eeprom.product_id);
	log_info("device-id: %.32s",  id_eeprom.device_id);
	log_info("hw-version: %.32s",  id_eeprom.hw_version);
	log_info("mac-addr: %02X:%02X:%02X:%02X:%02X:%02X",
            id_eeprom.mac_addr[0],
            id_eeprom.mac_addr[1],
            id_eeprom.mac_addr[2],
            id_eeprom.mac_addr[3],
            id_eeprom.mac_addr[4],
            id_eeprom.mac_addr[5]);
	
	log_info("imei: %.32s",  id_eeprom.imei);
	log_info("capa-gps: %s", DEVICE_CAPA(id_eeprom.capa, CAPA_GPS) ? "yes" : "no");
	log_info("capa-din: %s", DEVICE_CAPA(id_eeprom.capa, CAPA_DIN) ? "yes" : "no");
	log_info("capa-dout: %s", DEVICE_CAPA(id_eeprom.capa, CAPA_DOUT) ? "yes" : "no");
	log_info("capa-adc: %s", DEVICE_CAPA(id_eeprom.capa, CAPA_ADC) ? "yes" : "no");
	log_info("capa-wifi: %s", DEVICE_CAPA(id_eeprom.capa, CAPA_WIFI) ? "yes" : "no");
	log_info("capa-bluetooth: %s", DEVICE_CAPA(id_eeprom.capa, CAPA_BLUETOOTH) ? "yes" : "no");
	log_info("capa-wifi-bluetooth: %s", DEVICE_CAPA(id_eeprom.capa, CAPA_WIFI_BT) ? "yes" : "no");
	log_info("capa-gnss: %s", DEVICE_CAPA(id_eeprom.capa, CAPA_GNSS) ? "yes" : "no");

	if (DEVICE_CAPA(id_eeprom.capa, CAPA_BLUETOOTH)) {
		log_info("mac-bluetooth: %02X:%02X:%02X:%02X:%02X:%02X",
			id_eeprom.mac_bluetooth[0],
			id_eeprom.mac_bluetooth[1],
			id_eeprom.mac_bluetooth[2],
			id_eeprom.mac_bluetooth[3],
			id_eeprom.mac_bluetooth[4],
			id_eeprom.mac_bluetooth[5]);
	}
	if (DEVICE_CAPA(id_eeprom.capa, CAPA_WIFI)) {
		log_info("mac-wifi: %02X:%02X:%02X:%02X:%02X:%02X",
			id_eeprom.mac_wifi[0],
			id_eeprom.mac_wifi[1],
			id_eeprom.mac_wifi[2],
			id_eeprom.mac_wifi[3],
			id_eeprom.mac_wifi[4],
			id_eeprom.mac_wifi[5]);
	}
	//Loop Through UUID Bytes and print them in HEX
	ptr = (char*)buf;
	for(i = 0; i < 16; i++) {
		ptr += sprintf(ptr, "%02X", id_eeprom.uuid[i]);
	}
	log_info("uuid: %s", (char*)buf);

	return 0;
}

static void cleanup(void)
{
	log_info("cleaning up....");
	if (mts_io_platform_device) {
		platform_device_unregister(mts_io_platform_device);
	}

	teardown_accessory_ports();
	if(freelater) {
		kfree(freelater);
		freelater = NULL;
	}
	log_info("done cleaning up....");
}

static int __init mts_io_init(void)
{
	struct gpio_pin *pin;

	int ret;

	log_info("init: " DRIVER_VERSION);
	
	ret = mts_id_eeprom_load();
	if (ret) {
		cleanup();
		return ret;
	}

	mts_io_platform_device = platform_device_alloc(PLATFORM_NAME, -1);
	if (!mts_io_platform_device) {
		cleanup();
		return -ENOMEM;
	}

	ret = platform_device_add(mts_io_platform_device);
	if (ret) {
		cleanup();
		return ret;
	}

	init_accessory_ports();

	ret = sysfs_create_group(&mts_io_platform_device->dev.kobj, attr_group);
	if (ret) {
		cleanup();
		return ret;
	}

	for (pin = gpio_pins; *pin->name; pin++) {
		if (pin->capability == 0 || DEVICE_CAPA(id_eeprom.capa,pin->capability)) {
			ret = gpio_request_one(pin->pin.gpio, pin->pin.flags, pin->pin.label);
			if (ret)
				log_debug("could not request pin %s (%d) but it could have already been requested under a different pin name", pin->name, ret);
		}
	}

	// start the reset handler
	reset_callback(NULL);

	/* init timers */
	setup_timer(&radio_reset_timer, radio_reset_timer_callback, 0);
	setup_timer(&radio_reset_available_timer, radio_reset_available_timer_callback, 0);

	return 0;
}

static void __exit mts_io_exit(void)
{
	/* delete radio_reset_timer */
	del_timer(&radio_reset_timer);
	/* delete radio_reset_available_timer */
	del_timer(&radio_reset_available_timer);

	cancel_delayed_work_sync(&reset_work);

	cleanup();

	log_info("exiting");
}

module_init(mts_io_init);
module_exit(mts_io_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");

MODULE_ALIAS("mts-io-ap1-dout");
MODULE_ALIAS("mts-io-ap1-din");
MODULE_ALIAS("mts-io-ap1-adc");
MODULE_ALIAS("mts-io-ap2-dout");
MODULE_ALIAS("mts-io-ap2-din");
MODULE_ALIAS("mts-io-ap2-adc");