Added missing tegra files.HEADmaster

1 files changed, 804 insertions, 0 deletions

diff --git a/drivers/misc/inv_mpu/accel/mma8450.c b/drivers/misc/inv_mpu/accel/mma8450.c
new file mode 100644
index 00000000000..f698ee98bf5
--- /dev/null
+++ b/drivers/misc/inv_mpu/accel/mma8450.c
@@ -0,0 +1,804 @@
+/*
+        $License:
+        Copyright (C) 2011 InvenSense Corporation, All Rights Reserved.
+
+        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, see <http://www.gnu.org/licenses/>.
+        $
+ */
+
+/**
+ *  @addtogroup ACCELDL
+ *  @brief      Provides the interface to setup and handle an accelerometer.
+ *
+ *  @{
+ *      @file   mma8450.c
+ *      @brief  Accelerometer setup and handling methods for Freescale MMA8450.
+ */
+
+/* -------------------------------------------------------------------------- */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include "mpu-dev.h"
+
+#include <log.h>
+#include <linux/mpu.h>
+#include "mlsl.h"
+#include "mldl_cfg.h"
+#undef MPL_LOG_TAG
+#define MPL_LOG_TAG "MPL-acc"
+
+/* full scale setting - register & mask */
+#define ACCEL_MMA8450_XYZ_DATA_CFG      (0x16)
+
+#define ACCEL_MMA8450_CTRL_REG1         (0x38)
+#define ACCEL_MMA8450_CTRL_REG2     (0x39)
+#define ACCEL_MMA8450_CTRL_REG4         (0x3B)
+#define ACCEL_MMA8450_CTRL_REG5         (0x3C)
+
+#define ACCEL_MMA8450_CTRL_REG          (0x38)
+#define ACCEL_MMA8450_CTRL_MASK         (0x03)
+
+#define ACCEL_MMA8450_SLEEP_MASK        (0x03)
+
+/* -------------------------------------------------------------------------- */
+
+struct mma8450_config {
+        unsigned int odr;
+        unsigned int fsr;       /** < full scale range mg */
+        unsigned int ths;       /** < Motion no-motion thseshold mg */
+        unsigned int dur;       /** < Motion no-motion duration ms */
+        unsigned char reg_ths;
+        unsigned char reg_dur;
+        unsigned char ctrl_reg1;
+        unsigned char irq_type;
+        unsigned char mot_int1_cfg;
+};
+
+struct mma8450_private_data {
+        struct mma8450_config suspend;
+        struct mma8450_config resume;
+};
+
+
+/* -------------------------------------------------------------------------- */
+
+static int mma8450_set_ths(void *mlsl_handle,
+                        struct ext_slave_platform_data *pdata,
+                        struct mma8450_config *config,
+                        int apply,
+                        long ths)
+{
+        return INV_ERROR_FEATURE_NOT_IMPLEMENTED;
+}
+
+static int mma8450_set_dur(void *mlsl_handle,
+                        struct ext_slave_platform_data *pdata,
+                        struct mma8450_config *config,
+                        int apply,
+                        long dur)
+{
+        return INV_ERROR_FEATURE_NOT_IMPLEMENTED;
+}
+
+/**
+ *  @brief Sets the IRQ to fire when one of the IRQ events occur.
+ *         Threshold and duration will not be used unless the type is MOT or
+ *         NMOT.
+ *
+ *  @param mlsl_handle
+ *             the handle to the serial channel the device is connected to.
+ *  @param pdata
+ *             a pointer to the slave platform data.
+ *  @param config
+ *              configuration to apply to, suspend or resume
+ *  @param apply
+ *             whether to apply immediately or save the settings to be applied
+ *             at the next resume.
+ *  @param irq_type
+ *              the type of IRQ.  Valid values are
+ *              - MPU_SLAVE_IRQ_TYPE_NONE
+ *              - MPU_SLAVE_IRQ_TYPE_MOTION
+ *              - MPU_SLAVE_IRQ_TYPE_DATA_READY
+ *
+ *  @return INV_SUCCESS if successful or a non-zero error code.
+ */
+static int mma8450_set_irq(void *mlsl_handle,
+                struct ext_slave_platform_data *pdata,
+                struct mma8450_config *config,
+                int apply,
+                long irq_type)
+{
+        int result = INV_SUCCESS;
+        unsigned char reg1;
+        unsigned char reg2;
+        unsigned char reg3;
+
+        config->irq_type = (unsigned char)irq_type;
+        if (irq_type == MPU_SLAVE_IRQ_TYPE_DATA_READY) {
+                reg1 = 0x01;
+                reg2 = 0x01;
+                reg3 = 0x07;
+        } else if (irq_type == MPU_SLAVE_IRQ_TYPE_NONE) {
+                reg1 = 0x00;
+                reg2 = 0x00;
+                reg3 = 0x00;
+        } else {
+                return INV_ERROR_FEATURE_NOT_IMPLEMENTED;
+        }
+
+        if (apply) {
+                /* XYZ_DATA_CFG: event flag enabled on Z axis */
+                result = inv_serial_single_write(mlsl_handle, pdata->address,
+                                        ACCEL_MMA8450_XYZ_DATA_CFG, reg3);
+                if (result) {
+                        LOG_RESULT_LOCATION(result);
+                        return result;
+                }
+                result = inv_serial_single_write(mlsl_handle, pdata->address,
+                                        ACCEL_MMA8450_CTRL_REG4, reg1);
+                if (result) {
+                        LOG_RESULT_LOCATION(result);
+                        return result;
+                }
+                result = inv_serial_single_write(mlsl_handle, pdata->address,
+                                        ACCEL_MMA8450_CTRL_REG5, reg2);
+                if (result) {
+                        LOG_RESULT_LOCATION(result);
+                        return result;
+                }
+        }
+
+        return result;
+}
+
+/**
+ *  @brief Set the output data rate for the particular configuration.
+ *
+ *  @param mlsl_handle
+ *             the handle to the serial channel the device is connected to.
+ *  @param pdata
+ *             a pointer to the slave platform data.
+ *  @param config
+ *             Config to modify with new ODR.
+ *  @param apply
+ *             whether to apply immediately or save the settings to be applied
+ *             at the next resume.
+ *  @param odr
+ *             Output data rate in units of 1/1000Hz (mHz).
+ *
+ *  @return INV_SUCCESS if successful or a non-zero error code.
+ */
+static int mma8450_set_odr(void *mlsl_handle,
+                struct ext_slave_platform_data *pdata,
+                struct mma8450_config *config,
+                int apply,
+                long odr)
+{
+        unsigned char bits;
+        int result = INV_SUCCESS;
+
+        if (odr > 200000) {
+                config->odr = 400000;
+                bits = 0x00;
+        } else if (odr > 100000) {
+                config->odr = 200000;
+                bits = 0x04;
+        } else if (odr > 50000) {
+                config->odr = 100000;
+                bits = 0x08;
+        } else if (odr > 25000) {
+                config->odr = 50000;
+                bits = 0x0C;
+        } else if (odr > 12500) {
+                config->odr = 25000;
+                bits = 0x40; /* Sleep -> Auto wake mode */
+        } else if (odr > 1563) {
+                config->odr = 12500;
+                bits = 0x10;
+        } else if (odr > 0) {
+                config->odr = 1563;
+                bits = 0x14;
+        } else {
+                config->ctrl_reg1 = 0; /* Set FS1.FS2 to Standby */
+                config->odr = 0;
+                bits = 0;
+        }
+
+        config->ctrl_reg1 = bits | (config->ctrl_reg1 & 0x3);
+        if (apply) {
+                result = inv_serial_single_write(mlsl_handle, pdata->address,
+                                ACCEL_MMA8450_CTRL_REG1, 0);
+                if (result) {
+                        LOG_RESULT_LOCATION(result);
+                        return result;
+                }
+                result = inv_serial_single_write(mlsl_handle, pdata->address,
+                                ACCEL_MMA8450_CTRL_REG1, config->ctrl_reg1);
+                if (result) {
+                        LOG_RESULT_LOCATION(result);
+                        return result;
+                }
+                MPL_LOGV("ODR: %d mHz, 0x%02x\n",
+                        config->odr, (int)config->ctrl_reg1);
+        }
+        return result;
+}
+
+/**
+ *  @brief Set the full scale range of the accels
+ *
+ *  @param mlsl_handle
+ *             the handle to the serial channel the device is connected to.
+ *  @param pdata
+ *             a pointer to the slave platform data.
+ *  @param config
+ *             pointer to configuration.
+ *  @param apply
+ *             whether to apply immediately or save the settings to be applied
+ *             at the next resume.
+ *  @param fsr
+ *             requested full scale range.
+ *
+ *  @return INV_SUCCESS if successful or a non-zero error code.
+ */
+static int mma8450_set_fsr(void *mlsl_handle,
+                struct ext_slave_platform_data *pdata,
+                struct mma8450_config *config,
+                int apply,
+                long fsr)
+{
+        unsigned char bits;
+        int result = INV_SUCCESS;
+
+        if (fsr <= 2000) {
+                bits = 0x01;
+                config->fsr = 2000;
+        } else if (fsr <= 4000) {
+                bits = 0x02;
+                config->fsr = 4000;
+        } else {
+                bits = 0x03;
+                config->fsr = 8000;
+        }
+
+        config->ctrl_reg1 = bits | (config->ctrl_reg1 & 0xFC);
+        if (apply) {
+                result = inv_serial_single_write(mlsl_handle, pdata->address,
+                                ACCEL_MMA8450_CTRL_REG1, config->ctrl_reg1);
+                if (result) {
+                        LOG_RESULT_LOCATION(result);
+                        return result;
+                }
+                MPL_LOGV("FSR: %d mg\n", config->fsr);
+        }
+        return result;
+}
+
+/**
+ *  @brief suspends the device to put it in its lowest power mode.
+ *
+ *  @param mlsl_handle
+ *             the handle to the serial channel the device is connected to.
+ *  @param slave
+ *             a pointer to the slave descriptor data structure.
+ *  @param pdata
+ *             a pointer to the slave platform data.
+ *
+ *  @return INV_SUCCESS if successful or a non-zero error code.
+ */
+static int mma8450_suspend(void *mlsl_handle,
+                    struct ext_slave_descr *slave,
+                    struct ext_slave_platform_data *pdata)
+{
+        int result;
+        struct mma8450_private_data *private_data = pdata->private_data;
+
+        if (private_data->suspend.fsr == 4000)
+                slave->range.mantissa = 4;
+        else if (private_data->suspend.fsr == 8000)
+                slave->range.mantissa = 8;
+        else
+                slave->range.mantissa = 2;
+        slave->range.fraction = 0;
+
+        result = inv_serial_single_write(mlsl_handle, pdata->address,
+                        ACCEL_MMA8450_CTRL_REG1, 0);
+        if (result) {
+                LOG_RESULT_LOCATION(result);
+                return result;
+        }
+        if (private_data->suspend.ctrl_reg1) {
+                result = inv_serial_single_write(mlsl_handle, pdata->address,
+                                ACCEL_MMA8450_CTRL_REG1,
+                                private_data->suspend.ctrl_reg1);
+                if (result) {
+                        LOG_RESULT_LOCATION(result);
+                        return result;
+                }
+        }
+
+        result = mma8450_set_irq(mlsl_handle, pdata,
+                                &private_data->suspend,
+                                true, private_data->suspend.irq_type);
+        if (result) {
+                LOG_RESULT_LOCATION(result);
+                return result;
+        }
+        return result;
+}
+
+/**
+ *  @brief resume the device in the proper power state given the configuration
+ *         chosen.
+ *
+ *  @param mlsl_handle
+ *             the handle to the serial channel the device is connected to.
+ *  @param slave
+ *             a pointer to the slave descriptor data structure.
+ *  @param pdata
+ *             a pointer to the slave platform data.
+ *
+ *  @return INV_SUCCESS if successful or a non-zero error code.
+ */
+static int mma8450_resume(void *mlsl_handle,
+                   struct ext_slave_descr *slave,
+                   struct ext_slave_platform_data *pdata)
+{
+        int result = INV_SUCCESS;
+        struct mma8450_private_data *private_data = pdata->private_data;
+
+        /* Full Scale */
+        if (private_data->resume.fsr == 4000)
+                slave->range.mantissa = 4;
+        else if (private_data->resume.fsr == 8000)
+                slave->range.mantissa = 8;
+        else
+                slave->range.mantissa = 2;
+        slave->range.fraction = 0;
+
+        if (result) {
+                LOG_RESULT_LOCATION(result);
+                return result;
+        }
+        result = inv_serial_single_write(mlsl_handle, pdata->address,
+                        ACCEL_MMA8450_CTRL_REG1, 0);
+        if (result) {
+                LOG_RESULT_LOCATION(result);
+                return result;
+        }
+        if (private_data->resume.ctrl_reg1) {
+                result = inv_serial_single_write(mlsl_handle, pdata->address,
+                                ACCEL_MMA8450_CTRL_REG1,
+                                private_data->resume.ctrl_reg1);
+                if (result) {
+                        LOG_RESULT_LOCATION(result);
+                        return result;
+                }
+        }
+        result = mma8450_set_irq(mlsl_handle, pdata,
+                        &private_data->resume,
+                        true, private_data->resume.irq_type);
+        if (result) {
+                LOG_RESULT_LOCATION(result);
+                return result;
+        }
+
+        return result;
+}
+
+/**
+ *  @brief read the sensor data from the device.
+ *
+ *  @param mlsl_handle
+ *             the handle to the serial channel the device is connected to.
+ *  @param slave
+ *             a pointer to the slave descriptor data structure.
+ *  @param pdata
+ *             a pointer to the slave platform data.
+ *  @param data
+ *             a buffer to store the data read.
+ *
+ *  @return INV_SUCCESS if successful or a non-zero error code.
+ */
+static int mma8450_read(void *mlsl_handle,
+                 struct ext_slave_descr *slave,
+                 struct ext_slave_platform_data *pdata, unsigned char *data)
+{
+        int result;
+        unsigned char local_data[4];    /* Status register + 3 bytes data */
+        result = inv_serial_read(mlsl_handle, pdata->address,
+                                0x00, sizeof(local_data), local_data);
+        if (result) {
+                LOG_RESULT_LOCATION(result);
+                return result;
+        }
+        memcpy(data, &local_data[1], (slave->read_len) - 1);
+
+        MPL_LOGV("Data Not Ready: %02x %02x %02x %02x\n",
+                 local_data[0], local_data[1],
+                 local_data[2], local_data[3]);
+
+        return result;
+}
+
+/**
+ *  @brief one-time device driver initialization function.
+ *         If the driver is built as a kernel module, this function will be
+ *         called when the module is loaded in the kernel.
+ *         If the driver is built-in in the kernel, this function will be
+ *         called at boot time.
+ *
+ *  @param mlsl_handle
+ *             the handle to the serial channel the device is connected to.
+ *  @param slave
+ *             a pointer to the slave descriptor data structure.
+ *  @param pdata
+ *             a pointer to the slave platform data.
+ *
+ *  @return INV_SUCCESS if successful or a non-zero error code.
+ */
+static int mma8450_init(void *mlsl_handle,
+                          struct ext_slave_descr *slave,
+                          struct ext_slave_platform_data *pdata)
+{
+        struct mma8450_private_data *private_data;
+        private_data = (struct mma8450_private_data *)
+            kzalloc(sizeof(struct mma8450_private_data), GFP_KERNEL);
+
+        if (!private_data)
+                return INV_ERROR_MEMORY_EXAUSTED;
+
+        pdata->private_data = private_data;
+
+        mma8450_set_odr(mlsl_handle, pdata, &private_data->suspend,
+                        false, 0);
+        mma8450_set_odr(mlsl_handle, pdata, &private_data->resume,
+                        false, 200000);
+        mma8450_set_fsr(mlsl_handle, pdata, &private_data->suspend,
+                        false, 2000);
+        mma8450_set_fsr(mlsl_handle, pdata, &private_data->resume,
+                        false, 2000);
+        mma8450_set_irq(mlsl_handle, pdata, &private_data->suspend,
+                        false,
+                        MPU_SLAVE_IRQ_TYPE_NONE);
+        mma8450_set_irq(mlsl_handle, pdata, &private_data->resume,
+                        false,
+                        MPU_SLAVE_IRQ_TYPE_NONE);
+        return INV_SUCCESS;
+}
+
+/**
+ *  @brief one-time device driver exit function.
+ *         If the driver is built as a kernel module, this function will be
+ *         called when the module is removed from the kernel.
+ *
+ *  @param mlsl_handle
+ *             the handle to the serial channel the device is connected to.
+ *  @param slave
+ *             a pointer to the slave descriptor data structure.
+ *  @param pdata
+ *             a pointer to the slave platform data.
+ *
+ *  @return INV_SUCCESS if successful or a non-zero error code.
+ */
+static int mma8450_exit(void *mlsl_handle,
+                          struct ext_slave_descr *slave,
+                          struct ext_slave_platform_data *pdata)
+{
+        kfree(pdata->private_data);
+        return INV_SUCCESS;
+}
+
+/**
+ *  @brief device configuration facility.
+ *
+ *  @param mlsl_handle
+ *             the handle to the serial channel the device is connected to.
+ *  @param slave
+ *             a pointer to the slave descriptor data structure.
+ *  @param pdata
+ *             a pointer to the slave platform data.
+ *  @param data
+ *             a pointer to the configuration data structure.
+ *
+ *  @return INV_SUCCESS if successful or a non-zero error code.
+ */
+static int mma8450_config(void *mlsl_handle,
+                        struct ext_slave_descr *slave,
+                        struct ext_slave_platform_data *pdata,
+                        struct ext_slave_config *data)
+{
+        struct mma8450_private_data *private_data = pdata->private_data;
+        if (!data->data)
+                return INV_ERROR_INVALID_PARAMETER;
+
+        switch (data->key) {
+        case MPU_SLAVE_CONFIG_ODR_SUSPEND:
+                return mma8450_set_odr(mlsl_handle, pdata,
+                                        &private_data->suspend,
+                                        data->apply,
+                                        *((long *)data->data));
+        case MPU_SLAVE_CONFIG_ODR_RESUME:
+                return mma8450_set_odr(mlsl_handle, pdata,
+                                        &private_data->resume,
+                                        data->apply,
+                                        *((long *)data->data));
+        case MPU_SLAVE_CONFIG_FSR_SUSPEND:
+                return mma8450_set_fsr(mlsl_handle, pdata,
+                                        &private_data->suspend,
+                                        data->apply,
+                                        *((long *)data->data));
+        case MPU_SLAVE_CONFIG_FSR_RESUME:
+                return mma8450_set_fsr(mlsl_handle, pdata,
+                                        &private_data->resume,
+                                        data->apply,
+                                        *((long *)data->data));
+        case MPU_SLAVE_CONFIG_MOT_THS:
+                return mma8450_set_ths(mlsl_handle, pdata,
+                                        &private_data->suspend,
+                                        data->apply,
+                                        *((long *)data->data));
+        case MPU_SLAVE_CONFIG_NMOT_THS:
+                return mma8450_set_ths(mlsl_handle, pdata,
+                                        &private_data->resume,
+                                        data->apply,
+                                        *((long *)data->data));
+        case MPU_SLAVE_CONFIG_MOT_DUR:
+                return mma8450_set_dur(mlsl_handle, pdata,
+                                        &private_data->suspend,
+                                        data->apply,
+                                        *((long *)data->data));
+        case MPU_SLAVE_CONFIG_NMOT_DUR:
+                return mma8450_set_dur(mlsl_handle, pdata,
+                                        &private_data->resume,
+                                        data->apply,
+                                        *((long *)data->data));
+        case MPU_SLAVE_CONFIG_IRQ_SUSPEND:
+                return mma8450_set_irq(mlsl_handle, pdata,
+                                        &private_data->suspend,
+                                        data->apply,
+                                        *((long *)data->data));
+        case MPU_SLAVE_CONFIG_IRQ_RESUME:
+                return mma8450_set_irq(mlsl_handle, pdata,
+                                        &private_data->resume,
+                                        data->apply,
+                                        *((long *)data->data));
+        default:
+                LOG_RESULT_LOCATION(INV_ERROR_FEATURE_NOT_IMPLEMENTED);
+                return INV_ERROR_FEATURE_NOT_IMPLEMENTED;
+        };
+
+        return INV_SUCCESS;
+}
+
+/**
+ *  @brief facility to retrieve the device configuration.
+ *
+ *  @param mlsl_handle
+ *             the handle to the serial channel the device is connected to.
+ *  @param slave
+ *             a pointer to the slave descriptor data structure.
+ *  @param pdata
+ *             a pointer to the slave platform data.
+ *  @param data
+ *             a pointer to store the returned configuration data structure.
+ *
+ *  @return INV_SUCCESS if successful or a non-zero error code.
+ */
+static int mma8450_get_config(void *mlsl_handle,
+                                struct ext_slave_descr *slave,
+                                struct ext_slave_platform_data *pdata,
+                                struct ext_slave_config *data)
+{
+        struct mma8450_private_data *private_data = pdata->private_data;
+        if (!data->data)
+                return INV_ERROR_INVALID_PARAMETER;
+
+        switch (data->key) {
+        case MPU_SLAVE_CONFIG_ODR_SUSPEND:
+                (*(unsigned long *)data->data) =
+                        (unsigned long) private_data->suspend.odr;
+                break;
+        case MPU_SLAVE_CONFIG_ODR_RESUME:
+                (*(unsigned long *)data->data) =
+                        (unsigned long) private_data->resume.odr;
+                break;
+        case MPU_SLAVE_CONFIG_FSR_SUSPEND:
+                (*(unsigned long *)data->data) =
+                        (unsigned long) private_data->suspend.fsr;
+                break;
+        case MPU_SLAVE_CONFIG_FSR_RESUME:
+                (*(unsigned long *)data->data) =
+                        (unsigned long) private_data->resume.fsr;
+                break;
+        case MPU_SLAVE_CONFIG_MOT_THS:
+                (*(unsigned long *)data->data) =
+                        (unsigned long) private_data->suspend.ths;
+                break;
+        case MPU_SLAVE_CONFIG_NMOT_THS:
+                (*(unsigned long *)data->data) =
+                        (unsigned long) private_data->resume.ths;
+                break;
+        case MPU_SLAVE_CONFIG_MOT_DUR:
+                (*(unsigned long *)data->data) =
+                        (unsigned long) private_data->suspend.dur;
+                break;
+        case MPU_SLAVE_CONFIG_NMOT_DUR:
+                (*(unsigned long *)data->data) =
+                        (unsigned long) private_data->resume.dur;
+                break;
+        case MPU_SLAVE_CONFIG_IRQ_SUSPEND:
+                (*(unsigned long *)data->data) =
+                        (unsigned long) private_data->suspend.irq_type;
+                break;
+        case MPU_SLAVE_CONFIG_IRQ_RESUME:
+                (*(unsigned long *)data->data) =
+                        (unsigned long) private_data->resume.irq_type;
+                break;
+        default:
+                LOG_RESULT_LOCATION(INV_ERROR_FEATURE_NOT_IMPLEMENTED);
+                return INV_ERROR_FEATURE_NOT_IMPLEMENTED;
+        };
+
+        return INV_SUCCESS;
+}
+
+static struct ext_slave_descr mma8450_descr = {
+        .init             = mma8450_init,
+        .exit             = mma8450_exit,
+        .suspend          = mma8450_suspend,
+        .resume           = mma8450_resume,
+        .read             = mma8450_read,
+        .config           = mma8450_config,
+        .get_config       = mma8450_get_config,
+        .name             = "mma8450",
+        .type             = EXT_SLAVE_TYPE_ACCEL,
+        .id               = ACCEL_ID_MMA8450,
+        .read_reg         = 0x00,
+        .read_len         = 4,
+        .endian           = EXT_SLAVE_FS8_BIG_ENDIAN,
+        .range            = {2, 0},
+        .trigger          = NULL,
+};
+
+static
+struct ext_slave_descr *mma8450_get_slave_descr(void)
+{
+        return &mma8450_descr;
+}
+
+/* -------------------------------------------------------------------------- */
+struct mma8450_mod_private_data {
+        struct i2c_client *client;
+        struct ext_slave_platform_data *pdata;
+};
+
+static unsigned short normal_i2c[] = { I2C_CLIENT_END };
+
+static int mma8450_mod_probe(struct i2c_client *client,
+                           const struct i2c_device_id *devid)
+{
+        struct ext_slave_platform_data *pdata;
+        struct mma8450_mod_private_data *private_data;
+        int result = 0;
+
+        dev_info(&client->adapter->dev, "%s: %s\n", __func__, devid->name);
+
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+                result = -ENODEV;
+                goto out_no_free;
+        }
+
+        pdata = client->dev.platform_data;
+        if (!pdata) {
+                dev_err(&client->adapter->dev,
+                        "Missing platform data for slave %s\n", devid->name);
+                result = -EFAULT;
+                goto out_no_free;
+        }
+
+        private_data = kzalloc(sizeof(*private_data), GFP_KERNEL);
+        if (!private_data) {
+                result = -ENOMEM;
+                goto out_no_free;
+        }
+
+        i2c_set_clientdata(client, private_data);
+        private_data->client = client;
+        private_data->pdata = pdata;
+
+        result = inv_mpu_register_slave(THIS_MODULE, client, pdata,
+                                        mma8450_get_slave_descr);
+        if (result) {
+                dev_err(&client->adapter->dev,
+                        "Slave registration failed: %s, %d\n",
+                        devid->name, result);
+                goto out_free_memory;
+        }
+
+        return result;
+
+out_free_memory:
+        kfree(private_data);
+out_no_free:
+        dev_err(&client->adapter->dev, "%s failed %d\n", __func__, result);
+        return result;
+
+}
+
+static int mma8450_mod_remove(struct i2c_client *client)
+{
+        struct mma8450_mod_private_data *private_data =
+                i2c_get_clientdata(client);
+
+        dev_dbg(&client->adapter->dev, "%s\n", __func__);
+
+        inv_mpu_unregister_slave(client, private_data->pdata,
+                                mma8450_get_slave_descr);
+
+        kfree(private_data);
+        return 0;
+}
+
+static const struct i2c_device_id mma8450_mod_id[] = {
+        { "mma8450", ACCEL_ID_MMA8450 },
+        {}
+};
+
+MODULE_DEVICE_TABLE(i2c, mma8450_mod_id);
+
+static struct i2c_driver mma8450_mod_driver = {
+        .class = I2C_CLASS_HWMON,
+        .probe = mma8450_mod_probe,
+        .remove = mma8450_mod_remove,
+        .id_table = mma8450_mod_id,
+        .driver = {
+                   .owner = THIS_MODULE,
+                   .name = "mma8450_mod",
+                   },
+        .address_list = normal_i2c,
+};
+
+static int __init mma8450_mod_init(void)
+{
+        int res = i2c_add_driver(&mma8450_mod_driver);
+        pr_info("%s: Probe name %s\n", __func__, "mma8450_mod");
+        if (res)
+                pr_err("%s failed\n", __func__);
+        return res;
+}
+
+static void __exit mma8450_mod_exit(void)
+{
+        pr_info("%s\n", __func__);
+        i2c_del_driver(&mma8450_mod_driver);
+}
+
+module_init(mma8450_mod_init);
+module_exit(mma8450_mod_exit);
+
+MODULE_AUTHOR("Invensense Corporation");
+MODULE_DESCRIPTION("Driver to integrate MMA8450 sensor with the MPU");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("mma8450_mod");
+
+/**
+ *  @}
+ */