path: root/io-module/mts_io.c

/*
 * IO Controller for the MTCDP Platform
 *
 * Copyright (C) 2010 by Multi-Tech Systems
 *
 * Author: James Maki <jmaki@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
 *
 */
/*
 * See arch/arm/mach-at91board-sam9g20ek.c for an alternate approach to
 * setting LEDs (ek_leds) and adding platform devices and platform drivers.
 *
 */
#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 "mts_io.h"

#define DRIVER_VERSION	"v0.2.0"
#define DRIVER_AUTHOR	"James Maki <jmaki@multitech.com>"
#define DRIVER_DESC	"IO Controller for the MTCDP Platform"
#define DRIVER_NAME	"mts-io"

#define PLATFORM_NAME	"mtcdp"

#define DEBUG 1
#if DEBUG
#  define dbg(fmt, args...)	printk(KERN_DEBUG DRIVER_NAME ": " fmt "\n" , ##args)
#else
#  define dbg(fmt, args...)	do {} while (0)
#endif
#define error(fmt, args...)	printk(KERN_ERR DRIVER_NAME ": " fmt "\n" , ##args)
#define info(fmt, args...)	printk(KERN_INFO DRIVER_NAME ": " fmt "\n" , ##args)

enum {
	LED_OFF,
	LED_ON,
	LED_FLASHING,
};

#define BOARD_REVA		0
#define BOARD_REVB		1
#define BOARD_REVC		2

static u8 board_rev = BOARD_REVA;

#define LED_CD_BIT		BIT(0)
#define EXTSERIAL_RI_BIT	BIT(1)
#define EXTSERIAL_DSR_BIT	BIT(2)
#define CS0_BIT3		BIT(3)
#define LED_SIG1_BIT		BIT(4)
#define LED_SIG2_BIT		BIT(5)
#define LED_SIG3_BIT		BIT(6)
#define EXTSERIAL_DCD_BIT	BIT(7)

#define GPIO_VER0		AT91_PIN_PA23
#define GPIO_VER1		AT91_PIN_PA24
#define GPIO_STATUS_LED		AT91_PIN_PA30
#define GPIO_LS_LED		AT91_PIN_PC9
#define GPIO_ENIO		AT91_PIN_PC15
#define GPIO_ETH0_ENABLED	AT91_PIN_PB31
#define GPIO_RADIO_RESET	AT91_PIN_PB30
#define GPIO_OPTRST		AT91_PIN_PA22
#define GPIO_RSERSRC		AT91_PIN_PC7
#define GPIO_DBSERON		AT91_PIN_PC6
#define GPIO_DTR1		AT91_PIN_PC10
#define GPIO_RXD1MON		AT91_PIN_PC8
#define GPIO_EXTIN0		AT91_PIN_PB13
#define GPIO_EXTIN1		AT91_PIN_PB12
#define GPIO_EXTIN2		AT91_PIN_PB11
#define GPIO_EXTIN3		AT91_PIN_PB10
#define GPIO_EXTIN4		AT91_PIN_PB9
#define GPIO_EXTIN5		AT91_PIN_PB8
#define GPIO_GPS_NINT2		AT91_PIN_PC2

#define LED_STATUS_CONTROLLABLE		0
#define LED_LS_CONTROLLABLE		0

#if LED_STATUS_CONTROLLABLE
static int led_mode_status = LED_OFF;
#endif

static struct spi_device *spi_sregout;
static u8 spi_sregout_byte;
static DEFINE_MUTEX(spi_sregout_mutex);

static struct spi_device *spi_temp;

static int spi_sregout_write(struct spi_device *spi, const u8 value)
{
	return spi_write(spi, &value, 1);
}

static int spi_temp_read(struct spi_device *spi, u16 *value)
{
	int tmp;
	u8 buf[2] = {0, 0};

	tmp = spi_read(spi, buf, 2);
	*value = buf[0] << 8 | buf[1];

	return tmp;
}

#define BLINK_PER_SEC		8
#define BLINK_INTERVAL		(HZ / BLINK_PER_SEC)
#define RESET_HOLD_COUNT	(BLINK_PER_SEC * 3)

static pid_t reset_pid = -1;
static pid_t reset_count = 0;
static int reset_short_signal = SIGUSR1;
static int reset_long_signal = SIGUSR2;
static DEFINE_MUTEX(mts_io_mutex);

static void blink_callback(struct work_struct *ignored);

static DECLARE_DELAYED_WORK(blink_work, blink_callback);

static void blink_callback(struct work_struct *ignored)
{
	unsigned long reset_pressed = !at91_get_gpio_value(GPIO_OPTRST);
	struct pid *vpid = NULL;

	mutex_lock(&mts_io_mutex);

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

	if (vpid) {
		if (reset_pressed) {
			reset_count++;
		} else if (reset_count > 0 && reset_count < RESET_HOLD_COUNT) {
			kill_pid(vpid, reset_short_signal, 1);
			reset_count = 0;
		}

		if (reset_count >= RESET_HOLD_COUNT) {
			reset_count = 0;
			kill_pid(vpid, reset_long_signal, 1);
		}
	} else {
		reset_count = 0;
	}

#if LED_STATUS_CONTROLLABLE
	if (led_mode_status == LED_FLASHING) {
		at91_set_gpio_value(GPIO_STATUS_LED, !at91_get_gpio_value(GPIO_STATUS_LED));
	}
#endif

	mutex_unlock(&mts_io_mutex);

	schedule_delayed_work(&blink_work, BLINK_INTERVAL);
}

static int radio_reset(void)
{
	int ret;

	ret = at91_set_gpio_value(GPIO_RADIO_RESET, 0);
	if (ret) {
		return ret;
	}

	udelay(1000);

	ret = at91_set_gpio_value(GPIO_RADIO_RESET, 1);

	return ret;
}

static int ADT7302_to_celsius(int value)
{
	if (value & 0x2000) {
		value = value - 16384;
	}

	value = value / 32 + 1 * ((value % 32) >= 16);

	return value;
}

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

	mutex_lock(&mts_io_mutex);

	value = at91_get_gpio_value(GPIO_RADIO_RESET);

	mutex_unlock(&mts_io_mutex);

	if (value < 0) {
		return value;
	}

	return sprintf(buf, "%d\n", value);
}

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

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

	mutex_lock(&mts_io_mutex);

	err = radio_reset();

	mutex_unlock(&mts_io_mutex);

	if (err) {
		return err;
	}

	return count;
}

static struct device_attribute dev_attr_radio_reset = {
	.attr = {
		.name = "radio-reset",
		.mode = 0644,
	},
	.show = show_radio_reset,
	.store = store_radio_reset,
};

static ssize_t show_eth0_enabled(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	int value;

	mutex_lock(&mts_io_mutex);

	value = at91_get_gpio_value(GPIO_ETH0_ENABLED);

	mutex_unlock(&mts_io_mutex);

	if (value < 0) {
		return value;
	}

	return sprintf(buf, "%d\n", value);
}

static ssize_t store_eth0_enabled(struct device *dev, struct device_attribute *attr,
			 const char *buf, size_t count)
{
	int value;
	int err;

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

	mutex_lock(&mts_io_mutex);

	err = at91_set_gpio_value(GPIO_ETH0_ENABLED, value);

	mutex_unlock(&mts_io_mutex);

	if (err) {
		return err;
	}

	return count;
}

static struct device_attribute dev_attr_eth0_enabled = {
	.attr = {
		.name = "eth0-enabled",
		.mode = 0644,
	},
	.show = show_eth0_enabled,
	.store = store_eth0_enabled,
};

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

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

	mutex_lock(&spi_sregout_mutex);

	value = spi_sregout_byte & EXTSERIAL_DCD_BIT ? 0 : 1;

	mutex_unlock(&spi_sregout_mutex);

	return sprintf(buf, "%d\n", value);
}

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

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

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

	mutex_lock(&spi_sregout_mutex);

	if (value) {
		spi_sregout_byte &= ~EXTSERIAL_DCD_BIT;
	} else {
		spi_sregout_byte |= EXTSERIAL_DCD_BIT;
	}
	spi_sregout_write(spi_sregout, spi_sregout_byte);

	mutex_unlock(&spi_sregout_mutex);

	return count;
}

static struct device_attribute dev_attr_extserial_dcd = {
	.attr = {
		.name = "extserial-dcd",
		.mode = 0644,
	},
	.show = show_extserial_dcd,
	.store = store_extserial_dcd,
};

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

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

	mutex_lock(&spi_sregout_mutex);

	value = spi_sregout_byte & EXTSERIAL_RI_BIT ? 0 : 1;

	mutex_unlock(&spi_sregout_mutex);

	return sprintf(buf, "%d\n", value);
}

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

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

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

	mutex_lock(&spi_sregout_mutex);

	if (value) {
		spi_sregout_byte &= ~EXTSERIAL_RI_BIT;
	} else {
		spi_sregout_byte |= EXTSERIAL_RI_BIT;
	}
	spi_sregout_write(spi_sregout, spi_sregout_byte);

	mutex_unlock(&spi_sregout_mutex);

	return count;
}

static struct device_attribute dev_attr_extserial_ri = {
	.attr = {
		.name = "extserial-ri",
		.mode = 0644,
	},
	.show = show_extserial_ri,
	.store = store_extserial_ri,
};

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

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

	mutex_lock(&spi_sregout_mutex);

	value = spi_sregout_byte & EXTSERIAL_DSR_BIT ? 0 : 1;

	mutex_unlock(&spi_sregout_mutex);

	return sprintf(buf, "%d\n", value);
}

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

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

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

	mutex_lock(&spi_sregout_mutex);

	if (value) {
		spi_sregout_byte &= ~EXTSERIAL_DSR_BIT;
	} else {
		spi_sregout_byte |= EXTSERIAL_DSR_BIT;
	}
	spi_sregout_write(spi_sregout, spi_sregout_byte);

	mutex_unlock(&spi_sregout_mutex);

	return count;
}

static struct device_attribute dev_attr_extserial_dsr = {
	.attr = {
		.name = "extserial-dsr",
		.mode = 0644,
	},
	.show = show_extserial_dsr,
	.store = store_extserial_dsr,
};

static ssize_t show_led_sig1(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	int value;

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

	mutex_lock(&spi_sregout_mutex);

	value = spi_sregout_byte & LED_SIG1_BIT ? 0 : 1;

	mutex_unlock(&spi_sregout_mutex);

	return sprintf(buf, "%d\n", value);
}

static ssize_t store_led_sig1(struct device *dev, struct device_attribute *attr,
			 const char *buf, size_t count)
{
	int value;

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

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

	mutex_lock(&spi_sregout_mutex);

	if (value) {
		spi_sregout_byte &= ~LED_SIG1_BIT;
	} else {
		spi_sregout_byte |= LED_SIG1_BIT;
	}
	spi_sregout_write(spi_sregout, spi_sregout_byte);

	mutex_unlock(&spi_sregout_mutex);

	return count;
}

static struct device_attribute dev_attr_led_sig1 = {
	.attr = {
		.name = "led-sig1",
		.mode = 0644,
	},
	.show = show_led_sig1,
	.store = store_led_sig1,
};

static struct device_attribute dev_attr_led_sdk_c = {
	.attr = {
		.name = "led-sdk-c",
		.mode = 0644,
	},
	.show = show_led_sig1,
	.store = store_led_sig1,
};

static ssize_t show_led_sig2(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	int value;

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

	mutex_lock(&spi_sregout_mutex);

	value = spi_sregout_byte & LED_SIG2_BIT ? 0 : 1;

	mutex_unlock(&spi_sregout_mutex);

	return sprintf(buf, "%d\n", value);
}

static ssize_t store_led_sig2(struct device *dev, struct device_attribute *attr,
			 const char *buf, size_t count)
{
	int value;

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

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

	mutex_lock(&spi_sregout_mutex);

	if (value) {
		spi_sregout_byte &= ~LED_SIG2_BIT;
	} else {
		spi_sregout_byte |= LED_SIG2_BIT;
	}
	spi_sregout_write(spi_sregout, spi_sregout_byte);

	mutex_unlock(&spi_sregout_mutex);

	return count;
}

static struct device_attribute dev_attr_led_sig2 = {
	.attr = {
		.name = "led-sig2",
		.mode = 0644,
	},
	.show = show_led_sig2,
	.store = store_led_sig2,
};

static struct device_attribute dev_attr_led_sdk_d = {
	.attr = {
		.name = "led-sdk-d",
		.mode = 0644,
	},
	.show = show_led_sig2,
	.store = store_led_sig2,
};

static ssize_t show_led_sig3(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	int value;

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

	mutex_lock(&spi_sregout_mutex);

	value = spi_sregout_byte & LED_SIG3_BIT ? 0 : 1;

	mutex_unlock(&spi_sregout_mutex);

	return sprintf(buf, "%d\n", value);
}

static ssize_t store_led_sig3(struct device *dev, struct device_attribute *attr,
			 const char *buf, size_t count)
{
	int value;

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

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

	mutex_lock(&spi_sregout_mutex);

	if (value) {
		spi_sregout_byte &= ~LED_SIG3_BIT;
	} else {
		spi_sregout_byte |= LED_SIG3_BIT;
	}
	spi_sregout_write(spi_sregout, spi_sregout_byte);

	mutex_unlock(&spi_sregout_mutex);

	return count;
}

static struct device_attribute dev_attr_led_sig3 = {
	.attr = {
		.name = "led-sig3",
		.mode = 0644,
	},
	.show = show_led_sig3,
	.store = store_led_sig3,
};

static struct device_attribute dev_attr_led_sdk_e = {
	.attr = {
		.name = "led-sdk-e",
		.mode = 0644,
	},
	.show = show_led_sig3,
	.store = store_led_sig3,
};

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

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

	mutex_lock(&spi_sregout_mutex);

	value = spi_sregout_byte & LED_CD_BIT ? 0 : 1;

	mutex_unlock(&spi_sregout_mutex);

	return sprintf(buf, "%d\n", value);
}

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

	if (!spi_sregout) {
		error("device not present");
		return -ENODEV;
	}

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

	mutex_lock(&spi_sregout_mutex);

	if (value) {
		spi_sregout_byte &= ~LED_CD_BIT;
	} else {
		spi_sregout_byte |= LED_CD_BIT;
	}
	spi_sregout_write(spi_sregout, spi_sregout_byte);

	mutex_unlock(&spi_sregout_mutex);

	return count;
}

static struct device_attribute dev_attr_led_cd = {
	.attr = {
		.name = "led-cd",
		.mode = 0644,
	},
	.show = show_led_cd,
	.store = store_led_cd,
};

static struct device_attribute dev_attr_led_sdk_b = {
	.attr = {
		.name = "led-sdk-b",
		.mode = 0644,
	},
	.show = show_led_cd,
	.store = store_led_cd,
};

#if LED_STATUS_CONTROLLABLE
static ssize_t show_led_status(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	return sprintf(buf, "%d\n", led_mode_status);
}

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

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

	mutex_lock(&mts_io_mutex);

	switch (value) {
	case LED_OFF:
		led_mode_status = LED_OFF;
		ret = at91_set_gpio_value(GPIO_STATUS_LED, 1);

		break;

	case LED_ON:
		led_mode_status = LED_ON;
		ret = at91_set_gpio_value(GPIO_STATUS_LED, 0);

		break;

	case LED_FLASHING:
		led_mode_status = LED_FLASHING;
		ret = at91_set_gpio_value(GPIO_STATUS_LED, 0);

		break;

	default:
		ret = -EINVAL;
	}

	mutex_unlock(&mts_io_mutex);

	return count;
}

static struct device_attribute dev_attr_led_status = {
	.attr = {
		.name = "led-status",
		.mode = 0644,
	},
	.show = show_led_status,
	.store = store_led_status,
};

static struct device_attribute dev_attr_led_sdk_a = {
	.attr = {
		.name = "led-sdk-a",
		.mode = 0644,
	},
	.show = show_led_status,
	.store = store_led_status,
};
#endif

#if LED_LS_CONTROLLABLE
static ssize_t show_led_ls(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	int value;

	mutex_lock(&mts_io_mutex);

	value = at91_get_gpio_value(GPIO_LS_LED);

	mutex_unlock(&mts_io_mutex);

	if (value < 0) {
		return value;
	}

	return sprintf(buf, "%d\n", !value);
}

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

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

	mutex_lock(&mts_io_mutex);

	err = at91_set_gpio_value(GPIO_LS_LED, !value);

	mutex_unlock(&mts_io_mutex);

	if (err) {
		return err;
	}

	return count;
}

static struct device_attribute dev_attr_led_ls = {
	.attr = {
		.name = "led-ls",
		.mode = 0644,
	},
	.show = show_led_ls,
	.store = store_led_ls,
};
#endif

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

	mutex_lock(&mts_io_mutex);

	value = !at91_get_gpio_value(GPIO_OPTRST);

	mutex_unlock(&mts_io_mutex);

	if (value < 0) {
		return value;
	}

	return sprintf(buf, "%d\n", value);
}

static struct device_attribute dev_attr_reset = {
	.attr = {
		.name = "reset",
		.mode = 0444,
	},
	.show = show_reset,
};

static ssize_t 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\n", reset_pid, reset_short_signal, reset_long_signal);

	mutex_unlock(&mts_io_mutex);

	return ret;
}

static ssize_t 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;

	if (sscanf(buf, "%i %i %i", &pid, &short_signal, &long_signal) != 3) {
		return -EINVAL;
	}

	mutex_lock(&mts_io_mutex);

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

	mutex_unlock(&mts_io_mutex);

	return count;
}

static struct device_attribute dev_attr_reset_monitor = {
	.attr = {
		.name = "reset-monitor",
		.mode = 0644,
	},
	.show = show_reset_monitor,
	.store = store_reset_monitor,
};

static ssize_t show_board_temperature(struct device *dev,
			struct device_attribute *attr,
			char *buf)
{
	int tmp;
	u16 temp_raw;

	tmp = spi_temp_read(spi_temp, &temp_raw);
	if (tmp) {
		error("spi_read temp failed %d", tmp);
		return tmp;
	}

	dbg("temp: 0x%04X", temp_raw);

	return sprintf(buf, "%d\n", ADT7302_to_celsius(temp_raw));
}

static struct device_attribute dev_attr_board_temperature = {
	.attr = {
		.name = "board-temperature",
		.mode = 0444,
	},
	.show = show_board_temperature,
};

static struct attribute *platform_attributes[] = {
	&dev_attr_radio_reset.attr,
	&dev_attr_eth0_enabled.attr,
	&dev_attr_extserial_dcd.attr,
	&dev_attr_extserial_ri.attr,
	&dev_attr_led_sig1.attr,
	&dev_attr_led_sdk_c.attr,
	&dev_attr_led_sig2.attr,
	&dev_attr_led_sdk_d.attr,
	&dev_attr_led_sig3.attr,
	&dev_attr_led_sdk_e.attr,
	&dev_attr_led_cd.attr,
	&dev_attr_led_sdk_b.attr,
#if LED_STATUS_CONTROLLABLE
	&dev_attr_led_status.attr,
	&dev_attr_led_sdk_a.attr,
#endif
#if LED_LS_CONTROLLABLE
	&dev_attr_led_ls.attr,
#endif
	&dev_attr_reset.attr,
	&dev_attr_reset_monitor.attr,
	&dev_attr_board_temperature.attr,
	NULL,
};

static struct attribute_group platform_attribute_group = {
	.attrs = platform_attributes
};

static struct platform_device *mts_io_platform_device;

enum {
	DIR_INPUT,
	DIR_OUTPUT,
};

struct gpio_pin_init {
	char name[32];
	unsigned long pin;
	int direction;
	int output_value;
	int use_pullup;
	int board_rev_added;
};

static struct gpio_pin_init init_pins[] = {
	/*
	 * GPIO_{VER0,VER1} need to be first in the list.
	 */
	{
		.name = "GPIO_VER0",
		.pin = GPIO_VER0,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVA,
	},
	{
		.name = "GPIO_VER1",
		.pin = GPIO_VER1,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVA,
	},
	{
		.name = "GPIO_ENIO",
		.pin = GPIO_ENIO,
		.direction = DIR_OUTPUT,
		.output_value = 1,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVA,
	},
	{
		.name = "GPIO_ETH0_ENABLED",
		.pin = AT91_PIN_PB31,
		.direction = DIR_OUTPUT,
		.output_value = 1,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVA,
	},
	{
		.name = "GPIO_RADIO_RESET",
		.pin = GPIO_RADIO_RESET,
		.direction = DIR_OUTPUT,
		.output_value = 1,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVA,
	},
	{
		.name = "GPIO_OPTRST",
		.pin = GPIO_OPTRST,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVA,
	},
#if LED_LS_CONTROLLABLE
	{
		.name = "GPIO_LS_LED",
		.pin = GPIO_LS_LED,
		.direction = DIR_OUTPUT,
		.output_value = 1,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVA,
	},
#endif
#if LED_STATUS_CONTROLLABLE
	{
		.name = "GPIO_STATUS_LED",
		.pin = GPIO_STATUS_LED,
		.direction = DIR_OUTPUT,
		.output_value = 1,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVA,
	},
#endif
	{
		.name = "GPIO_RSERSRC",
		.pin = GPIO_RSERSRC,
		.direction = DIR_OUTPUT,
		.output_value = 1,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVB,
	},
	{
		.name = "GPIO_DBSERON",
		.pin = GPIO_DBSERON,
		.direction = DIR_OUTPUT,
		.output_value = 1,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVB,
	},
	{
		.name = "GPIO_DTR1",
		.pin = GPIO_DTR1,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVB,
	},
	{
		.name = "GPIO_RXD1MON",
		.pin = GPIO_RXD1MON,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVB,
	},
	{
		.name = "GPIO_EXTIN0",
		.pin = GPIO_EXTIN0,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVB,
	},
	{
		.name = "GPIO_EXTIN1",
		.pin = GPIO_EXTIN1,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVB,
	},
	{
		.name = "GPIO_EXTIN2",
		.pin = GPIO_EXTIN2,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVB,
	},
#if 0
	{
		.name = "GPIO_EXTIN3",
		.pin = GPIO_EXTIN3,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVC,
	},
	{
		.name = "GPIO_EXTIN4",
		.pin = GPIO_EXTIN4,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVC,
	},
	{
		.name = "GPIO_EXTIN5",
		.pin = GPIO_EXTIN5,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVC,
	},
	{
		.name = "GPIO_GPS_NINT2",
		.pin = GPIO_GPS_NINT2,
		.direction = DIR_INPUT,
		.output_value = 0,
		.use_pullup = 0,
		.board_rev_added = BOARD_REVC,
	},
#endif
};

static int __devinit mts_spi_sregout_probe(struct spi_device *spi)
{
	int tmp;

	spi->max_speed_hz = 1 * 1000 * 1000;
	spi->mode = 0;

	tmp = spi_setup(spi);
	if (tmp < 0) {
		return tmp;
	}

	spi_sregout_byte = 0xFF;
	spi_sregout_write(spi, spi_sregout_byte);

	spi_sregout = spi;

	return 0;
}

static int mts_spi_sregout_remove(struct spi_device *spi)
{
	return 0;
}

static struct spi_driver mts_spi_sregout_driver = {
	.driver = {
		.name = "mts-io-sregout",
		.bus = &spi_bus_type,
		.owner = THIS_MODULE,
	},

	.probe = mts_spi_sregout_probe,
	.remove = __devexit_p(mts_spi_sregout_remove),
};

static int __devinit mts_spi_board_temp_probe(struct spi_device *spi)
{
	int tmp;

	spi->max_speed_hz = 1 * 1000 * 1000;
	spi->mode = SPI_CPOL | SPI_CPHA;

	tmp = spi_setup(spi);
	if (tmp < 0) {
		error("spi_setup board-tmp");
		return tmp;
	}

	spi_temp = spi;

	return 0;
}

static int mts_spi_board_temp_remove(struct spi_device *spi)
{
	return 0;
}

static struct spi_driver mts_spi_board_temp_driver = {
	.driver = {
		.name = "mts-io-board-temp",
		.bus = &spi_bus_type,
		.owner = THIS_MODULE,
	},

	.probe = mts_spi_board_temp_probe,
	.remove = __devexit_p(mts_spi_board_temp_remove),
};

static int __init mts_io_init(void)
{
	int i;
	int ret;

	info("init");

	mts_io_platform_device = platform_device_alloc(PLATFORM_NAME, -1);
	if (!mts_io_platform_device) {
		ret = -ENOMEM;
		goto error1;
	}

	ret = platform_device_add(mts_io_platform_device);
	if (ret) {
		goto error2;
	}

	ret = sysfs_create_group(&mts_io_platform_device->dev.kobj,
					&platform_attribute_group);
	if (ret) {
		goto error3;
	}

	for (i = 0; i < ARRAY_SIZE(init_pins); i++) {
		gpio_request(init_pins[i].pin, init_pins[i].name);

		if (board_rev >= init_pins[i].board_rev_added) {
			if (init_pins[i].direction == DIR_OUTPUT) {
				at91_set_gpio_output(init_pins[i].pin,
						init_pins[i].output_value);
			} else {
				at91_set_gpio_input(init_pins[i].pin,
						init_pins[i].use_pullup);
			}
		}

		if (i == 1) {
			board_rev = (at91_get_gpio_value(GPIO_VER1) << 1) |
					at91_get_gpio_value(GPIO_VER0);
			board_rev ^= 0x03;
			info("board rev: %d", board_rev);

			if (board_rev == BOARD_REVA) {
				error("rev A boards are not supported");
				ret = -EIO;
				goto error3;
			}
		}
	}

	at91_set_gpio_value(GPIO_ENIO, 0);

	ret = spi_register_driver(&mts_spi_sregout_driver);
	if (ret) {
		goto error3;
	}

	ret = spi_register_driver(&mts_spi_board_temp_driver);
	if (ret) {
		goto error4;
	}

	blink_callback(NULL);

	return 0;

error4:
	spi_unregister_driver(&mts_spi_sregout_driver);
error3:
	platform_device_del(mts_io_platform_device);
error2:
	platform_device_put(mts_io_platform_device);
error1:
	error("init failed: %d", ret);

	return ret;
}

static void __exit mts_io_exit(void)
{
	int i;

	cancel_delayed_work_sync(&blink_work);

	spi_unregister_driver(&mts_spi_board_temp_driver);
	spi_unregister_driver(&mts_spi_sregout_driver);

	if (board_rev >= init_pins[i].board_rev_added) {
		for (i = 0; i < ARRAY_SIZE(init_pins); i++) {
			at91_set_gpio_input(init_pins[i].pin, init_pins[i].use_pullup);
		}
	}

	sysfs_remove_group(&mts_io_platform_device->dev.kobj,
				&platform_attribute_group);
	platform_device_unregister(mts_io_platform_device);

	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");