drivers/serial/max3107-aava.c - kernel/msm-4.9 - Gitiles

 /*
  *  max3107.c - spi uart protocol driver for Maxim 3107
  *  Based on max3100.c
  *	by Christian Pellegrin <chripell@evolware.org>
  *  and	max3110.c
  *	by Feng Tang <feng.tang@intel.com>
  *
  *  Copyright (C) Aavamobile 2009
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  *  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/device.h>
 #include <linux/serial_core.h>
 #include <linux/serial.h>
 #include <linux/spi/spi.h>
 #include <linux/freezer.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
 #include <linux/sfi.h>
 #include <asm/mrst.h>
 #include "max3107.h"

 /* GPIO direction to input function */
 static int max3107_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
 {
 	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
 	u16 buf[1];		/* Buffer for SPI transfer */

 	if (offset >= MAX3107_GPIO_COUNT) {
 		dev_err(&s->spi->dev, "Invalid GPIO\n");
 		return -EINVAL;
 	}

 	/* Read current GPIO configuration register */
 	buf[0] = MAX3107_GPIOCFG_REG;
 	/* Perform SPI transfer */
 	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
 		dev_err(&s->spi->dev, "SPI transfer GPIO read failed\n");
 		return -EIO;
 	}
 	buf[0] &= MAX3107_SPI_RX_DATA_MASK;

 	/* Set GPIO to input */
 	buf[0] &= ~(0x0001 << offset);

 	/* Write new GPIO configuration register value */
 	buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);
 	/* Perform SPI transfer */
 	if (max3107_rw(s, (u8 *)buf, NULL, 2)) {
 		dev_err(&s->spi->dev, "SPI transfer GPIO write failed\n");
 		return -EIO;
 	}
 	return 0;
 }

 /* GPIO direction to output function */
 static int max3107_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
 					int value)
 {
 	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
 	u16 buf[2];	/* Buffer for SPI transfers */

 	if (offset >= MAX3107_GPIO_COUNT) {
 		dev_err(&s->spi->dev, "Invalid GPIO\n");
 		return -EINVAL;
 	}

 	/* Read current GPIO configuration and data registers */
 	buf[0] = MAX3107_GPIOCFG_REG;
 	buf[1] = MAX3107_GPIODATA_REG;
 	/* Perform SPI transfer */
 	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {
 		dev_err(&s->spi->dev, "SPI transfer gpio failed\n");
 		return -EIO;
 	}
 	buf[0] &= MAX3107_SPI_RX_DATA_MASK;
 	buf[1] &= MAX3107_SPI_RX_DATA_MASK;

 	/* Set GPIO to output */
 	buf[0] |= (0x0001 << offset);
 	/* Set value */
 	if (value)
 		buf[1] |= (0x0001 << offset);
 	else
 		buf[1] &= ~(0x0001 << offset);

 	/* Write new GPIO configuration and data register values */
 	buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);
 	buf[1] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);
 	/* Perform SPI transfer */
 	if (max3107_rw(s, (u8 *)buf, NULL, 4)) {
 		dev_err(&s->spi->dev,
 			"SPI transfer for GPIO conf data w failed\n");
 		return -EIO;
 	}
 	return 0;
 }

 /* GPIO value query function */
 static int max3107_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
 	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
 	u16 buf[1];	/* Buffer for SPI transfer */

 	if (offset >= MAX3107_GPIO_COUNT) {
 		dev_err(&s->spi->dev, "Invalid GPIO\n");
 		return -EINVAL;
 	}

 	/* Read current GPIO data register */
 	buf[0] = MAX3107_GPIODATA_REG;
 	/* Perform SPI transfer */
 	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
 		dev_err(&s->spi->dev, "SPI transfer GPIO data r failed\n");
 		return -EIO;
 	}
 	buf[0] &= MAX3107_SPI_RX_DATA_MASK;

 	/* Return value */
 	return buf[0] & (0x0001 << offset);
 }

 /* GPIO value set function */
 static void max3107_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
 	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
 	u16 buf[2];	/* Buffer for SPI transfers */

 	if (offset >= MAX3107_GPIO_COUNT) {
 		dev_err(&s->spi->dev, "Invalid GPIO\n");
 		return;
 	}

 	/* Read current GPIO configuration registers*/
 	buf[0] = MAX3107_GPIODATA_REG;
 	buf[1] = MAX3107_GPIOCFG_REG;
 	/* Perform SPI transfer */
 	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {
 		dev_err(&s->spi->dev,
 			"SPI transfer for GPIO data and config read failed\n");
 		return;
 	}
 	buf[0] &= MAX3107_SPI_RX_DATA_MASK;
 	buf[1] &= MAX3107_SPI_RX_DATA_MASK;

 	if (!(buf[1] & (0x0001 << offset))) {
 		/* Configured as input, can't set value */
 		dev_warn(&s->spi->dev,
 				"Trying to set value for input GPIO\n");
 		return;
 	}

 	/* Set value */
 	if (value)
 		buf[0] |= (0x0001 << offset);
 	else
 		buf[0] &= ~(0x0001 << offset);

 	/* Write new GPIO data register value */
 	buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);
 	/* Perform SPI transfer */
 	if (max3107_rw(s, (u8 *)buf, NULL, 2))
 		dev_err(&s->spi->dev, "SPI transfer GPIO data w failed\n");
 }

 /* GPIO chip data */
 static struct gpio_chip max3107_gpio_chip = {
 	.owner			= THIS_MODULE,
 	.direction_input	= max3107_gpio_direction_in,
 	.direction_output	= max3107_gpio_direction_out,
 	.get			= max3107_gpio_get,
 	.set			= max3107_gpio_set,
 	.can_sleep		= 1,
 	.base			= MAX3107_GPIO_BASE,
 	.ngpio			= MAX3107_GPIO_COUNT,
 };

 /**
  *	max3107_aava_reset	-	reset on AAVA systems
  *	@spi: The SPI device we are probing
  *
  *	Reset the device ready for probing.
  */

 static int max3107_aava_reset(struct spi_device *spi)
 {
 	/* Reset the chip */
 	if (gpio_request(MAX3107_RESET_GPIO, "max3107")) {
 		pr_err("Requesting RESET GPIO failed\n");
 		return -EIO;
 	}
 	if (gpio_direction_output(MAX3107_RESET_GPIO, 0)) {
 		pr_err("Setting RESET GPIO to 0 failed\n");
 		gpio_free(MAX3107_RESET_GPIO);
 		return -EIO;
 	}
 	msleep(MAX3107_RESET_DELAY);
 	if (gpio_direction_output(MAX3107_RESET_GPIO, 1)) {
 		pr_err("Setting RESET GPIO to 1 failed\n");
 		gpio_free(MAX3107_RESET_GPIO);
 		return -EIO;
 	}
 	gpio_free(MAX3107_RESET_GPIO);
 	msleep(MAX3107_WAKEUP_DELAY);
 	return 0;
 }

 static int max3107_aava_configure(struct max3107_port *s)
 {
 	int retval;

 	/* Initialize GPIO chip data */
 	s->chip = max3107_gpio_chip;
 	s->chip.label = s->spi->modalias;
 	s->chip.dev = &s->spi->dev;

 	/* Add GPIO chip */
 	retval = gpiochip_add(&s->chip);
 	if (retval) {
 		dev_err(&s->spi->dev, "Adding GPIO chip failed\n");
 		return retval;
 	}

 	/* Temporary fix for EV2 boot problems, set modem reset to 0 */
 	max3107_gpio_direction_out(&s->chip, 3, 0);
 	return 0;
 }

 #if 0
 /* This will get enabled once we have the board stuff merged for this
    specific case */

 static const struct baud_table brg13_ext[] = {
 	{ 300,    MAX3107_BRG13_B300 },
 	{ 600,    MAX3107_BRG13_B600 },
 	{ 1200,   MAX3107_BRG13_B1200 },
 	{ 2400,   MAX3107_BRG13_B2400 },
 	{ 4800,   MAX3107_BRG13_B4800 },
 	{ 9600,   MAX3107_BRG13_B9600 },
 	{ 19200,  MAX3107_BRG13_B19200 },
 	{ 57600,  MAX3107_BRG13_B57600 },
 	{ 115200, MAX3107_BRG13_B115200 },
 	{ 230400, MAX3107_BRG13_B230400 },
 	{ 460800, MAX3107_BRG13_B460800 },
 	{ 921600, MAX3107_BRG13_B921600 },
 	{ 0, 0 }
 };

 static void max3107_aava_init(struct max3107_port *s)
 {
 	/*override for AAVA SC specific*/
 	if (mrst_platform_id() == MRST_PLATFORM_AAVA_SC) {
 		if (get_koski_build_id() <= KOSKI_EV2)
 			if (s->ext_clk) {
 				s->brg_cfg = MAX3107_BRG13_B9600;
 				s->baud_tbl = (struct baud_table *)brg13_ext;
 			}
 	}
 }
 #endif

 static int __devexit max3107_aava_remove(struct spi_device *spi)
 {
 	struct max3107_port *s = dev_get_drvdata(&spi->dev);

 	/* Remove GPIO chip */
 	if (gpiochip_remove(&s->chip))
 		dev_warn(&spi->dev, "Removing GPIO chip failed\n");

 	/* Then do the default remove */
 	return max3107_remove(spi);
 }

 /* Platform data */
 static struct max3107_plat aava_plat_data = {
 	.loopback               = 0,
 	.ext_clk                = 1,
 /*	.init			= max3107_aava_init, */
 	.configure		= max3107_aava_configure,
 	.hw_suspend		= max3107_hw_susp,
 	.polled_mode            = 0,
 	.poll_time              = 0,
 };


 static int __devinit max3107_probe_aava(struct spi_device *spi)
 {
 	int err = max3107_aava_reset(spi);
 	if (err < 0)
 		return err;
 	return max3107_probe(spi, &aava_plat_data);
 }

 /* Spi driver data */
 static struct spi_driver max3107_driver = {
 	.driver = {
 		.name		= "aava-max3107",
 		.bus		= &spi_bus_type,
 		.owner		= THIS_MODULE,
 	},
 	.probe		= max3107_probe_aava,
 	.remove		= __devexit_p(max3107_aava_remove),
 	.suspend	= max3107_suspend,
 	.resume		= max3107_resume,
 };

 /* Driver init function */
 static int __init max3107_init(void)
 {
 	return spi_register_driver(&max3107_driver);
 }

 /* Driver exit function */
 static void __exit max3107_exit(void)
 {
 	spi_unregister_driver(&max3107_driver);
 }

 module_init(max3107_init);
 module_exit(max3107_exit);

 MODULE_DESCRIPTION("MAX3107 driver");
 MODULE_AUTHOR("Aavamobile");
 MODULE_ALIAS("aava-max3107-spi");
 MODULE_LICENSE("GPL v2");
	/*
	* max3107.c - spi uart protocol driver for Maxim 3107
	* Based on max3100.c
	* by Christian Pellegrin <chripell@evolware.org>
	* and max3110.c
	* by Feng Tang <feng.tang@intel.com>
	*
	* Copyright (C) Aavamobile 2009
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* 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/device.h>
	#include <linux/serial_core.h>
	#include <linux/serial.h>
	#include <linux/spi/spi.h>
	#include <linux/freezer.h>
	#include <linux/platform_device.h>
	#include <linux/gpio.h>
	#include <linux/sfi.h>
	#include <asm/mrst.h>
	#include "max3107.h"

	/* GPIO direction to input function */
	static int max3107_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
	{
	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
	u16 buf[1]; /* Buffer for SPI transfer */

	if (offset >= MAX3107_GPIO_COUNT) {
	dev_err(&s->spi->dev, "Invalid GPIO\n");
	return -EINVAL;
	}

	/* Read current GPIO configuration register */
	buf[0] = MAX3107_GPIOCFG_REG;
	/* Perform SPI transfer */
	if (max3107_rw(s, (u8 )buf, (u8 )buf, 2)) {
	dev_err(&s->spi->dev, "SPI transfer GPIO read failed\n");
	return -EIO;
	}
	buf[0] &= MAX3107_SPI_RX_DATA_MASK;

	/* Set GPIO to input */
	buf[0] &= ~(0x0001 << offset);

	/* Write new GPIO configuration register value */
	buf[0] \|= (MAX3107_WRITE_BIT \| MAX3107_GPIOCFG_REG);
	/* Perform SPI transfer */
	if (max3107_rw(s, (u8 *)buf, NULL, 2)) {
	dev_err(&s->spi->dev, "SPI transfer GPIO write failed\n");
	return -EIO;
	}
	return 0;
	}

	/* GPIO direction to output function */
	static int max3107_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
	int value)
	{
	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
	u16 buf[2]; /* Buffer for SPI transfers */

	if (offset >= MAX3107_GPIO_COUNT) {
	dev_err(&s->spi->dev, "Invalid GPIO\n");
	return -EINVAL;
	}

	/* Read current GPIO configuration and data registers */
	buf[0] = MAX3107_GPIOCFG_REG;
	buf[1] = MAX3107_GPIODATA_REG;
	/* Perform SPI transfer */
	if (max3107_rw(s, (u8 )buf, (u8 )buf, 4)) {
	dev_err(&s->spi->dev, "SPI transfer gpio failed\n");
	return -EIO;
	}
	buf[0] &= MAX3107_SPI_RX_DATA_MASK;
	buf[1] &= MAX3107_SPI_RX_DATA_MASK;

	/* Set GPIO to output */
	buf[0] \|= (0x0001 << offset);
	/* Set value */
	if (value)
	buf[1] \|= (0x0001 << offset);
	else
	buf[1] &= ~(0x0001 << offset);

	/* Write new GPIO configuration and data register values */
	buf[0] \|= (MAX3107_WRITE_BIT \| MAX3107_GPIOCFG_REG);
	buf[1] \|= (MAX3107_WRITE_BIT \| MAX3107_GPIODATA_REG);
	/* Perform SPI transfer */
	if (max3107_rw(s, (u8 *)buf, NULL, 4)) {
	dev_err(&s->spi->dev,
	"SPI transfer for GPIO conf data w failed\n");
	return -EIO;
	}
	return 0;
	}

	/* GPIO value query function */
	static int max3107_gpio_get(struct gpio_chip *chip, unsigned offset)
	{
	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
	u16 buf[1]; /* Buffer for SPI transfer */

	if (offset >= MAX3107_GPIO_COUNT) {
	dev_err(&s->spi->dev, "Invalid GPIO\n");
	return -EINVAL;
	}

	/* Read current GPIO data register */
	buf[0] = MAX3107_GPIODATA_REG;
	/* Perform SPI transfer */
	if (max3107_rw(s, (u8 )buf, (u8 )buf, 2)) {
	dev_err(&s->spi->dev, "SPI transfer GPIO data r failed\n");
	return -EIO;
	}
	buf[0] &= MAX3107_SPI_RX_DATA_MASK;

	/* Return value */
	return buf[0] & (0x0001 << offset);
	}

	/* GPIO value set function */
	static void max3107_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	{
	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
	u16 buf[2]; /* Buffer for SPI transfers */

	if (offset >= MAX3107_GPIO_COUNT) {
	dev_err(&s->spi->dev, "Invalid GPIO\n");
	return;
	}

	/* Read current GPIO configuration registers*/
	buf[0] = MAX3107_GPIODATA_REG;
	buf[1] = MAX3107_GPIOCFG_REG;
	/* Perform SPI transfer */
	if (max3107_rw(s, (u8 )buf, (u8 )buf, 4)) {
	dev_err(&s->spi->dev,
	"SPI transfer for GPIO data and config read failed\n");
	return;
	}
	buf[0] &= MAX3107_SPI_RX_DATA_MASK;
	buf[1] &= MAX3107_SPI_RX_DATA_MASK;

	if (!(buf[1] & (0x0001 << offset))) {
	/* Configured as input, can't set value */
	dev_warn(&s->spi->dev,
	"Trying to set value for input GPIO\n");
	return;
	}

	/* Set value */
	if (value)
	buf[0] \|= (0x0001 << offset);
	else
	buf[0] &= ~(0x0001 << offset);

	/* Write new GPIO data register value */
	buf[0] \|= (MAX3107_WRITE_BIT \| MAX3107_GPIODATA_REG);
	/* Perform SPI transfer */
	if (max3107_rw(s, (u8 *)buf, NULL, 2))
	dev_err(&s->spi->dev, "SPI transfer GPIO data w failed\n");
	}

	/* GPIO chip data */
	static struct gpio_chip max3107_gpio_chip = {
	.owner = THIS_MODULE,
	.direction_input = max3107_gpio_direction_in,
	.direction_output = max3107_gpio_direction_out,
	.get = max3107_gpio_get,
	.set = max3107_gpio_set,
	.can_sleep = 1,
	.base = MAX3107_GPIO_BASE,
	.ngpio = MAX3107_GPIO_COUNT,
	};

	/**
	* max3107_aava_reset - reset on AAVA systems
	* @spi: The SPI device we are probing
	*
	* Reset the device ready for probing.
	*/

	static int max3107_aava_reset(struct spi_device *spi)
	{
	/* Reset the chip */
	if (gpio_request(MAX3107_RESET_GPIO, "max3107")) {
	pr_err("Requesting RESET GPIO failed\n");
	return -EIO;
	}
	if (gpio_direction_output(MAX3107_RESET_GPIO, 0)) {
	pr_err("Setting RESET GPIO to 0 failed\n");
	gpio_free(MAX3107_RESET_GPIO);
	return -EIO;
	}
	msleep(MAX3107_RESET_DELAY);
	if (gpio_direction_output(MAX3107_RESET_GPIO, 1)) {
	pr_err("Setting RESET GPIO to 1 failed\n");
	gpio_free(MAX3107_RESET_GPIO);
	return -EIO;
	}
	gpio_free(MAX3107_RESET_GPIO);
	msleep(MAX3107_WAKEUP_DELAY);
	return 0;
	}

	static int max3107_aava_configure(struct max3107_port *s)
	{
	int retval;

	/* Initialize GPIO chip data */
	s->chip = max3107_gpio_chip;
	s->chip.label = s->spi->modalias;
	s->chip.dev = &s->spi->dev;

	/* Add GPIO chip */
	retval = gpiochip_add(&s->chip);
	if (retval) {
	dev_err(&s->spi->dev, "Adding GPIO chip failed\n");
	return retval;
	}

	/* Temporary fix for EV2 boot problems, set modem reset to 0 */
	max3107_gpio_direction_out(&s->chip, 3, 0);
	return 0;
	}

	#if 0
	/* This will get enabled once we have the board stuff merged for this
	specific case */

	static const struct baud_table brg13_ext[] = {
	{ 300, MAX3107_BRG13_B300 },
	{ 600, MAX3107_BRG13_B600 },
	{ 1200, MAX3107_BRG13_B1200 },
	{ 2400, MAX3107_BRG13_B2400 },
	{ 4800, MAX3107_BRG13_B4800 },
	{ 9600, MAX3107_BRG13_B9600 },
	{ 19200, MAX3107_BRG13_B19200 },
	{ 57600, MAX3107_BRG13_B57600 },
	{ 115200, MAX3107_BRG13_B115200 },
	{ 230400, MAX3107_BRG13_B230400 },
	{ 460800, MAX3107_BRG13_B460800 },
	{ 921600, MAX3107_BRG13_B921600 },
	{ 0, 0 }
	};

	static void max3107_aava_init(struct max3107_port *s)
	{
	/override for AAVA SC specific/
	if (mrst_platform_id() == MRST_PLATFORM_AAVA_SC) {
	if (get_koski_build_id() <= KOSKI_EV2)
	if (s->ext_clk) {
	s->brg_cfg = MAX3107_BRG13_B9600;
	s->baud_tbl = (struct baud_table *)brg13_ext;
	}
	}
	}
	#endif

	static int __devexit max3107_aava_remove(struct spi_device *spi)
	{
	struct max3107_port *s = dev_get_drvdata(&spi->dev);

	/* Remove GPIO chip */
	if (gpiochip_remove(&s->chip))
	dev_warn(&spi->dev, "Removing GPIO chip failed\n");

	/* Then do the default remove */
	return max3107_remove(spi);
	}

	/* Platform data */
	static struct max3107_plat aava_plat_data = {
	.loopback = 0,
	.ext_clk = 1,
	/* .init = max3107_aava_init, */
	.configure = max3107_aava_configure,
	.hw_suspend = max3107_hw_susp,
	.polled_mode = 0,
	.poll_time = 0,
	};


	static int __devinit max3107_probe_aava(struct spi_device *spi)
	{
	int err = max3107_aava_reset(spi);
	if (err < 0)
	return err;
	return max3107_probe(spi, &aava_plat_data);
	}

	/* Spi driver data */
	static struct spi_driver max3107_driver = {
	.driver = {
	.name = "aava-max3107",
	.bus = &spi_bus_type,
	.owner = THIS_MODULE,
	},
	.probe = max3107_probe_aava,
	.remove = __devexit_p(max3107_aava_remove),
	.suspend = max3107_suspend,
	.resume = max3107_resume,
	};

	/* Driver init function */
	static int __init max3107_init(void)
	{
	return spi_register_driver(&max3107_driver);
	}

	/* Driver exit function */
	static void __exit max3107_exit(void)
	{
	spi_unregister_driver(&max3107_driver);
	}

	module_init(max3107_init);
	module_exit(max3107_exit);

	MODULE_DESCRIPTION("MAX3107 driver");
	MODULE_AUTHOR("Aavamobile");
	MODULE_ALIAS("aava-max3107-spi");
	MODULE_LICENSE("GPL v2");