/*
 * ADXL345/346 Three-Axis Digital Accelerometers
 *
 * Enter bugs at http://blackfin.uclinux.org/
 *
 * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
 * Licensed under the GPL-2 or later.
 */

#include <linux/device.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/input/adxl34x.h>
#include <linux/module.h>

#include "adxl34x.h"

/* ADXL345/6 Register Map */
#define DEVID           0x00    /* R   Device ID */
#define THRESH_TAP      0x1D    /* R/W Tap threshold */
#define OFSX            0x1E    /* R/W X-axis offset */
#define OFSY            0x1F    /* R/W Y-axis offset */
#define OFSZ            0x20    /* R/W Z-axis offset */
#define DUR             0x21    /* R/W Tap duration */
#define LATENT          0x22    /* R/W Tap latency */
#define WINDOW          0x23    /* R/W Tap window */
#define THRESH_ACT      0x24    /* R/W Activity threshold */
#define THRESH_INACT    0x25    /* R/W Inactivity threshold */
#define TIME_INACT      0x26    /* R/W Inactivity time */
#define ACT_INACT_CTL   0x27    /* R/W Axis enable control for activity and */
                                /* inactivity detection */
#define THRESH_FF       0x28    /* R/W Free-fall threshold */
#define TIME_FF         0x29    /* R/W Free-fall time */
#define TAP_AXES        0x2A    /* R/W Axis control for tap/double tap */
#define ACT_TAP_STATUS  0x2B    /* R   Source of tap/double tap */
#define BW_RATE         0x2C    /* R/W Data rate and power mode control */
#define POWER_CTL       0x2D    /* R/W Power saving features control */
#define INT_ENABLE      0x2E    /* R/W Interrupt enable control */
#define INT_MAP         0x2F    /* R/W Interrupt mapping control */
#define INT_SOURCE      0x30    /* R   Source of interrupts */
#define DATA_FORMAT     0x31    /* R/W Data format control */
#define DATAX0          0x32    /* R   X-Axis Data 0 */
#define DATAX1          0x33    /* R   X-Axis Data 1 */
#define DATAY0          0x34    /* R   Y-Axis Data 0 */
#define DATAY1          0x35    /* R   Y-Axis Data 1 */
#define DATAZ0          0x36    /* R   Z-Axis Data 0 */
#define DATAZ1          0x37    /* R   Z-Axis Data 1 */
#define FIFO_CTL        0x38    /* R/W FIFO control */
#define FIFO_STATUS     0x39    /* R   FIFO status */
#define TAP_SIGN        0x3A    /* R   Sign and source for tap/double tap */
/* Orientation ADXL346 only */
#define ORIENT_CONF     0x3B    /* R/W Orientation configuration */
#define ORIENT          0x3C    /* R   Orientation status */

/* DEVIDs */
#define ID_ADXL345      0xE5
#define ID_ADXL346      0xE6

/* INT_ENABLE/INT_MAP/INT_SOURCE Bits */
#define DATA_READY      (1 << 7)
#define SINGLE_TAP      (1 << 6)
#define DOUBLE_TAP      (1 << 5)
#define ACTIVITY        (1 << 4)
#define INACTIVITY      (1 << 3)
#define FREE_FALL       (1 << 2)
#define WATERMARK       (1 << 1)
#define OVERRUN         (1 << 0)

/* ACT_INACT_CONTROL Bits */
#define ACT_ACDC        (1 << 7)
#define ACT_X_EN        (1 << 6)
#define ACT_Y_EN        (1 << 5)
#define ACT_Z_EN        (1 << 4)
#define INACT_ACDC      (1 << 3)
#define INACT_X_EN      (1 << 2)
#define INACT_Y_EN      (1 << 1)
#define INACT_Z_EN      (1 << 0)

/* TAP_AXES Bits */
#define SUPPRESS        (1 << 3)
#define TAP_X_EN        (1 << 2)
#define TAP_Y_EN        (1 << 1)
#define TAP_Z_EN        (1 << 0)

/* ACT_TAP_STATUS Bits */
#define ACT_X_SRC       (1 << 6)
#define ACT_Y_SRC       (1 << 5)
#define ACT_Z_SRC       (1 << 4)
#define ASLEEP          (1 << 3)
#define TAP_X_SRC       (1 << 2)
#define TAP_Y_SRC       (1 << 1)
#define TAP_Z_SRC       (1 << 0)

/* BW_RATE Bits */
#define LOW_POWER       (1 << 4)
#define RATE(x)         ((x) & 0xF)

/* POWER_CTL Bits */
#define PCTL_LINK       (1 << 5)
#define PCTL_AUTO_SLEEP (1 << 4)
#define PCTL_MEASURE    (1 << 3)
#define PCTL_SLEEP      (1 << 2)
#define PCTL_WAKEUP(x)  ((x) & 0x3)

/* DATA_FORMAT Bits */
#define SELF_TEST       (1 << 7)
#define SPI             (1 << 6)
#define INT_INVERT      (1 << 5)
#define FULL_RES        (1 << 3)
#define JUSTIFY         (1 << 2)
#define RANGE(x)        ((x) & 0x3)
#define RANGE_PM_2g     0
#define RANGE_PM_4g     1
#define RANGE_PM_8g     2
#define RANGE_PM_16g    3

/*
 * Maximum value our axis may get in full res mode for the input device
 * (signed 13 bits)
 */
#define ADXL_FULLRES_MAX_VAL 4096

/*
 * Maximum value our axis may get in fixed res mode for the input device
 * (signed 10 bits)
 */
#define ADXL_FIXEDRES_MAX_VAL 512

/* FIFO_CTL Bits */
#define FIFO_MODE(x)    (((x) & 0x3) << 6)
#define FIFO_BYPASS     0
#define FIFO_FIFO       1
#define FIFO_STREAM     2
#define FIFO_TRIGGER    3
#define TRIGGER         (1 << 5)
#define SAMPLES(x)      ((x) & 0x1F)

/* FIFO_STATUS Bits */
#define FIFO_TRIG       (1 << 7)
#define ENTRIES(x)      ((x) & 0x3F)

/* TAP_SIGN Bits ADXL346 only */
#define XSIGN           (1 << 6)
#define YSIGN           (1 << 5)
#define ZSIGN           (1 << 4)
#define XTAP            (1 << 3)
#define YTAP            (1 << 2)
#define ZTAP            (1 << 1)

/* ORIENT_CONF ADXL346 only */
#define ORIENT_DEADZONE(x)      (((x) & 0x7) << 4)
#define ORIENT_DIVISOR(x)       ((x) & 0x7)

/* ORIENT ADXL346 only */
#define ADXL346_2D_VALID                (1 << 6)
#define ADXL346_2D_ORIENT(x)            (((x) & 0x3) >> 4)
#define ADXL346_3D_VALID                (1 << 3)
#define ADXL346_3D_ORIENT(x)            ((x) & 0x7)
#define ADXL346_2D_PORTRAIT_POS         0       /* +X */
#define ADXL346_2D_PORTRAIT_NEG         1       /* -X */
#define ADXL346_2D_LANDSCAPE_POS        2       /* +Y */
#define ADXL346_2D_LANDSCAPE_NEG        3       /* -Y */

#define ADXL346_3D_FRONT                3       /* +X */
#define ADXL346_3D_BACK                 4       /* -X */
#define ADXL346_3D_RIGHT                2       /* +Y */
#define ADXL346_3D_LEFT                 5       /* -Y */
#define ADXL346_3D_TOP                  1       /* +Z */
#define ADXL346_3D_BOTTOM               6       /* -Z */

#undef ADXL_DEBUG

#define ADXL_X_AXIS                     0
#define ADXL_Y_AXIS                     1
#define ADXL_Z_AXIS                     2

#define AC_READ(ac, reg)        ((ac)->bops->read((ac)->dev, reg))
#define AC_WRITE(ac, reg, val)  ((ac)->bops->write((ac)->dev, reg, val))

struct axis_triple {
        int x;
        int y;
        int z;
};

struct adxl34x {
        struct device *dev;
        struct input_dev *input;
        struct mutex mutex;     /* reentrant protection for struct */
        struct adxl34x_platform_data pdata;
        struct axis_triple swcal;
        struct axis_triple hwcal;
        struct axis_triple saved;
        char phys[32];
        unsigned orient2d_saved;
        unsigned orient3d_saved;
        bool disabled;  /* P: mutex */
        bool opened;    /* P: mutex */
        bool suspended; /* P: mutex */
        bool fifo_delay;
        int irq;
        unsigned model;
        unsigned int_mask;

        const struct adxl34x_bus_ops *bops;
};

static const struct adxl34x_platform_data adxl34x_default_init = {
        .tap_threshold = 35,
        .tap_duration = 3,
        .tap_latency = 20,
        .tap_window = 20,
        .tap_axis_control = ADXL_TAP_X_EN | ADXL_TAP_Y_EN | ADXL_TAP_Z_EN,
        .act_axis_control = 0xFF,
        .activity_threshold = 6,
        .inactivity_threshold = 4,
        .inactivity_time = 3,
        .free_fall_threshold = 8,
        .free_fall_time = 0x20,
        .data_rate = 8,
        .data_range = ADXL_FULL_RES,

        .ev_type = EV_ABS,
        .ev_code_x = ABS_X,     /* EV_REL */
        .ev_code_y = ABS_Y,     /* EV_REL */
        .ev_code_z = ABS_Z,     /* EV_REL */

        .ev_code_tap = {BTN_TOUCH, BTN_TOUCH, BTN_TOUCH}, /* EV_KEY {x,y,z} */
        .power_mode = ADXL_AUTO_SLEEP | ADXL_LINK,
        .fifo_mode = ADXL_FIFO_STREAM,
        .watermark = 0,
};

static void adxl34x_get_triple(struct adxl34x *ac, struct axis_triple *axis)
{
        short buf[3];

        ac->bops->read_block(ac->dev, DATAX0, DATAZ1 - DATAX0 + 1, buf);

        mutex_lock(&ac->mutex);
        ac->saved.x = (s16) le16_to_cpu(buf[0]);
        axis->x = ac->saved.x;

        ac->saved.y = (s16) le16_to_cpu(buf[1]);
        axis->y = ac->saved.y;

        ac->saved.z = (s16) le16_to_cpu(buf[2]);
        axis->z = ac->saved.z;
        mutex_unlock(&ac->mutex);
}

static void adxl34x_service_ev_fifo(struct adxl34x *ac)
{
        struct adxl34x_platform_data *pdata = &ac->pdata;
        struct axis_triple axis;

        adxl34x_get_triple(ac, &axis);

        input_event(ac->input, pdata->ev_type, pdata->ev_code_x,
                    axis.x - ac->swcal.x);
        input_event(ac->input, pdata->ev_type, pdata->ev_code_y,
                    axis.y - ac->swcal.y);
        input_event(ac->input, pdata->ev_type, pdata->ev_code_z,
                    axis.z - ac->swcal.z);
}

static void adxl34x_report_key_single(struct input_dev *input, int key)
{
        input_report_key(input, key, true);
        input_sync(input);
        input_report_key(input, key, false);
}

static void adxl34x_send_key_events(struct adxl34x *ac,
                struct adxl34x_platform_data *pdata, int status, int press)
{
        int i;

        for (i = ADXL_X_AXIS; i <= ADXL_Z_AXIS; i++) {
                if (status & (1 << (ADXL_Z_AXIS - i)))
                        input_report_key(ac->input,
                                         pdata->ev_code_tap[i], press);
        }
}

static void adxl34x_do_tap(struct adxl34x *ac,
                struct adxl34x_platform_data *pdata, int status)
{
        adxl34x_send_key_events(ac, pdata, status, true);
        input_sync(ac->input);
        adxl34x_send_key_events(ac, pdata, status, false);
}

static irqreturn_t adxl34x_irq(int irq, void *handle)
{
        struct adxl34x *ac = handle;
        struct adxl34x_platform_data *pdata = &ac->pdata;
        int int_stat, tap_stat, samples, orient, orient_code;

        /*
         * ACT_TAP_STATUS should be read before clearing the interrupt
         * Avoid reading ACT_TAP_STATUS in case TAP detection is disabled
         */

        if (pdata->tap_axis_control & (TAP_X_EN | TAP_Y_EN | TAP_Z_EN))
                tap_stat = AC_READ(ac, ACT_TAP_STATUS);
        else
                tap_stat = 0;

        int_stat = AC_READ(ac, INT_SOURCE);

        if (int_stat & FREE_FALL)
                adxl34x_report_key_single(ac->input, pdata->ev_code_ff);

        if (int_stat & OVERRUN)
                dev_dbg(ac->dev, "OVERRUN\n");

        if (int_stat & (SINGLE_TAP | DOUBLE_TAP)) {
                adxl34x_do_tap(ac, pdata, tap_stat);

                if (int_stat & DOUBLE_TAP)
                        adxl34x_do_tap(ac, pdata, tap_stat);
        }

        if (pdata->ev_code_act_inactivity) {
                if (int_stat & ACTIVITY)
                        input_report_key(ac->input,
                                         pdata->ev_code_act_inactivity, 1);
                if (int_stat & INACTIVITY)
                        input_report_key(ac->input,
                                         pdata->ev_code_act_inactivity, 0);
        }

        /*
         * ORIENTATION SENSING ADXL346 only
         */
        if (pdata->orientation_enable) {
                orient = AC_READ(ac, ORIENT);
                if ((pdata->orientation_enable & ADXL_EN_ORIENTATION_2D) &&
                    (orient & ADXL346_2D_VALID)) {

                        orient_code = ADXL346_2D_ORIENT(orient);
                        /* Report orientation only when it changes */
                        if (ac->orient2d_saved != orient_code) {
                                ac->orient2d_saved = orient_code;
                                adxl34x_report_key_single(ac->input,
                                        pdata->ev_codes_orient_2d[orient_code]);
                        }
                }

                if ((pdata->orientation_enable & ADXL_EN_ORIENTATION_3D) &&
                    (orient & ADXL346_3D_VALID)) {

                        orient_code = ADXL346_3D_ORIENT(orient) - 1;
                        /* Report orientation only when it changes */
                        if (ac->orient3d_saved != orient_code) {
                                ac->orient3d_saved = orient_code;
                                adxl34x_report_key_single(ac->input,
                                        pdata->ev_codes_orient_3d[orient_code]);
                        }
                }
        }

        if (int_stat & (DATA_READY | WATERMARK)) {

                if (pdata->fifo_mode)
                        samples = ENTRIES(AC_READ(ac, FIFO_STATUS)) + 1;
                else
                        samples = 1;

                for (; samples > 0; samples--) {
                        adxl34x_service_ev_fifo(ac);
                        /*
                         * To ensure that the FIFO has
                         * completely popped, there must be at least 5 us between
                         * the end of reading the data registers, signified by the
                         * transition to register 0x38 from 0x37 or the CS pin
                         * going high, and the start of new reads of the FIFO or
                         * reading the FIFO_STATUS register. For SPI operation at
                         * 1.5 MHz or lower, the register addressing portion of the
                         * transmission is sufficient delay to ensure the FIFO has
                         * completely popped. It is necessary for SPI operation
                         * greater than 1.5 MHz to de-assert the CS pin to ensure a
                         * total of 5 us, which is at most 3.4 us at 5 MHz
                         * operation.
                         */
                        if (ac->fifo_delay && (samples > 1))
                                udelay(3);
                }
        }

        input_sync(ac->input);

        return IRQ_HANDLED;
}

static void __adxl34x_disable(struct adxl34x *ac)
{
        /*
         * A '0' places the ADXL34x into standby mode
         * with minimum power consumption.
         */
        AC_WRITE(ac, POWER_CTL, 0);
}

static void __adxl34x_enable(struct adxl34x *ac)
{
        AC_WRITE(ac, POWER_CTL, ac->pdata.power_mode | PCTL_MEASURE);
}

void adxl34x_suspend(struct adxl34x *ac)
{
        mutex_lock(&ac->mutex);

        if (!ac->suspended && !ac->disabled && ac->opened)
                __adxl34x_disable(ac);

        ac->suspended = true;

        mutex_unlock(&ac->mutex);
}
EXPORT_SYMBOL_GPL(adxl34x_suspend);

void adxl34x_resume(struct adxl34x *ac)
{
        mutex_lock(&ac->mutex);

        if (ac->suspended && !ac->disabled && ac->opened)
                __adxl34x_enable(ac);

        ac->suspended = false;

        mutex_unlock(&ac->mutex);
}
EXPORT_SYMBOL_GPL(adxl34x_resume);

static ssize_t adxl34x_disable_show(struct device *dev,
                                    struct device_attribute *attr, char *buf)
{
        struct adxl34x *ac = dev_get_drvdata(dev);

        return sprintf(buf, "%u\n", ac->disabled);
}

static ssize_t adxl34x_disable_store(struct device *dev,
                                     struct device_attribute *attr,
                                     const char *buf, size_t count)
{
        struct adxl34x *ac = dev_get_drvdata(dev);
        unsigned int val;
        int error;

        error = kstrtouint(buf, 10, &val);
        if (error)
                return error;

        mutex_lock(&ac->mutex);

        if (!ac->suspended && ac->opened) {
                if (val) {
                        if (!ac->disabled)
                                __adxl34x_disable(ac);
                } else {
                        if (ac->disabled)
                                __adxl34x_enable(ac);
                }
        }

        ac->disabled = !!val;

        mutex_unlock(&ac->mutex);

        return count;
}

static DEVICE_ATTR(disable, 0664, adxl34x_disable_show, adxl34x_disable_store);

static ssize_t adxl34x_calibrate_show(struct device *dev,
                                      struct device_attribute *attr, char *buf)
{
        struct adxl34x *ac = dev_get_drvdata(dev);
        ssize_t count;

        mutex_lock(&ac->mutex);
        count = sprintf(buf, "%d,%d,%d\n",
                        ac->hwcal.x * 4 + ac->swcal.x,
                        ac->hwcal.y * 4 + ac->swcal.y,
                        ac->hwcal.z * 4 + ac->swcal.z);
        mutex_unlock(&ac->mutex);

        return count;
}

static ssize_t adxl34x_calibrate_store(struct device *dev,
                                       struct device_attribute *attr,
                                       const char *buf, size_t count)
{
        struct adxl34x *ac = dev_get_drvdata(dev);

        /*
         * Hardware offset calibration has a resolution of 15.6 mg/LSB.
         * We use HW calibration and handle the remaining bits in SW. (4mg/LSB)
         */

        mutex_lock(&ac->mutex);
        ac->hwcal.x -= (ac->saved.x / 4);
        ac->swcal.x = ac->saved.x % 4;

        ac->hwcal.y -= (ac->saved.y / 4);
        ac->swcal.y = ac->saved.y % 4;

        ac->hwcal.z -= (ac->saved.z / 4);
        ac->swcal.z = ac->saved.z % 4;

        AC_WRITE(ac, OFSX, (s8) ac->hwcal.x);
        AC_WRITE(ac, OFSY, (s8) ac->hwcal.y);
        AC_WRITE(ac, OFSZ, (s8) ac->hwcal.z);
        mutex_unlock(&ac->mutex);

        return count;
}

static DEVICE_ATTR(calibrate, 0664,
                   adxl34x_calibrate_show, adxl34x_calibrate_store);

static ssize_t adxl34x_rate_show(struct device *dev,
                                 struct device_attribute *attr, char *buf)
{
        struct adxl34x *ac = dev_get_drvdata(dev);

        return sprintf(buf, "%u\n", RATE(ac->pdata.data_rate));
}

static ssize_t adxl34x_rate_store(struct device *dev,
                                  struct device_attribute *attr,
                                  const char *buf, size_t count)
{
        struct adxl34x *ac = dev_get_drvdata(dev);
        unsigned char val;
        int error;

        error = kstrtou8(buf, 10, &val);
        if (error)
                return error;

        mutex_lock(&ac->mutex);

        ac->pdata.data_rate = RATE(val);
        AC_WRITE(ac, BW_RATE,
                 ac->pdata.data_rate |
                        (ac->pdata.low_power_mode ? LOW_POWER : 0));

        mutex_unlock(&ac->mutex);

        return count;
}

static DEVICE_ATTR(rate, 0664, adxl34x_rate_show, adxl34x_rate_store);

static ssize_t adxl34x_autosleep_show(struct device *dev,
                                 struct device_attribute *attr, char *buf)
{
        struct adxl34x *ac = dev_get_drvdata(dev);

        return sprintf(buf, "%u\n",
                ac->pdata.power_mode & (PCTL_AUTO_SLEEP | PCTL_LINK) ? 1 : 0);
}

static ssize_t adxl34x_autosleep_store(struct device *dev,
                                  struct device_attribute *attr,
                                  const char *buf, size_t count)
{
        struct adxl34x *ac = dev_get_drvdata(dev);
        unsigned int val;
        int error;

        error = kstrtouint(buf, 10, &val);
        if (error)
                return error;

        mutex_lock(&ac->mutex);

        if (val)
                ac->pdata.power_mode |= (PCTL_AUTO_SLEEP | PCTL_LINK);
        else
                ac->pdata.power_mode &= ~(PCTL_AUTO_SLEEP | PCTL_LINK);

        if (!ac->disabled && !ac->suspended && ac->opened)
                AC_WRITE(ac, POWER_CTL, ac->pdata.power_mode | PCTL_MEASURE);

        mutex_unlock(&ac->mutex);

        return count;
}

static DEVICE_ATTR(autosleep, 0664,
                   adxl34x_autosleep_show, adxl34x_autosleep_store);

static ssize_t adxl34x_position_show(struct device *dev,
                                 struct device_attribute *attr, char *buf)
{
        struct adxl34x *ac = dev_get_drvdata(dev);
        ssize_t count;

        mutex_lock(&ac->mutex);
        count = sprintf(buf, "(%d, %d, %d)\n",
                        ac->saved.x, ac->saved.y, ac->saved.z);
        mutex_unlock(&ac->mutex);

        return count;
}

static DEVICE_ATTR(position, S_IRUGO, adxl34x_position_show, NULL);

#ifdef ADXL_DEBUG
static ssize_t adxl34x_write_store(struct device *dev,
                                   struct device_attribute *attr,
                                   const char *buf, size_t count)
{
        struct adxl34x *ac = dev_get_drvdata(dev);
        unsigned int val;
        int error;

        /*
         * This allows basic ADXL register write access for debug purposes.
         */
        error = kstrtouint(buf, 16, &val);
        if (error)
                return error;

        mutex_lock(&ac->mutex);
        AC_WRITE(ac, val >> 8, val & 0xFF);
        mutex_unlock(&ac->mutex);

        return count;
}

static DEVICE_ATTR(write, 0664, NULL, adxl34x_write_store);
#endif

static struct attribute *adxl34x_attributes[] = {
        &dev_attr_disable.attr,
        &dev_attr_calibrate.attr,
        &dev_attr_rate.attr,
        &dev_attr_autosleep.attr,
        &dev_attr_position.attr,
#ifdef ADXL_DEBUG
        &dev_attr_write.attr,
#endif
        NULL
};

static const struct attribute_group adxl34x_attr_group = {
        .attrs = adxl34x_attributes,
};

static int adxl34x_input_open(struct input_dev *input)
{
        struct adxl34x *ac = input_get_drvdata(input);

        mutex_lock(&ac->mutex);

        if (!ac->suspended && !ac->disabled)
                __adxl34x_enable(ac);

        ac->opened = true;

        mutex_unlock(&ac->mutex);

        return 0;
}

static void adxl34x_input_close(struct input_dev *input)
{
        struct adxl34x *ac = input_get_drvdata(input);

        mutex_lock(&ac->mutex);

        if (!ac->suspended && !ac->disabled)
                __adxl34x_disable(ac);

        ac->opened = false;

        mutex_unlock(&ac->mutex);
}

struct adxl34x *adxl34x_probe(struct device *dev, int irq,
                              bool fifo_delay_default,
                              const struct adxl34x_bus_ops *bops)
{
        struct adxl34x *ac;
        struct input_dev *input_dev;
        const struct adxl34x_platform_data *pdata;
        int err, range, i;
        unsigned char revid;

        if (!irq) {
                dev_err(dev, "no IRQ?\n");
                err = -ENODEV;
                goto err_out;
        }

        ac = kzalloc(sizeof(*ac), GFP_KERNEL);
        input_dev = input_allocate_device();
        if (!ac || !input_dev) {
                err = -ENOMEM;
                goto err_free_mem;
        }

        ac->fifo_delay = fifo_delay_default;

        pdata = dev->platform_data;
        if (!pdata) {
                dev_dbg(dev,
                        "No platform data: Using default initialization\n");
                pdata = &adxl34x_default_init;
        }

        ac->pdata = *pdata;
        pdata = &ac->pdata;

        ac->input = input_dev;
        ac->dev = dev;
        ac->irq = irq;
        ac->bops = bops;

        mutex_init(&ac->mutex);

        input_dev->name = "ADXL34x accelerometer";
        revid = AC_READ(ac, DEVID);

        switch (revid) {
        case ID_ADXL345:
                ac->model = 345;
                break;
        case ID_ADXL346:
                ac->model = 346;
                break;
        default:
                dev_err(dev, "Failed to probe %s\n", input_dev->name);
                err = -ENODEV;
                goto err_free_mem;
        }

        snprintf(ac->phys, sizeof(ac->phys), "%s/input0", dev_name(dev));

        input_dev->phys = ac->phys;
        input_dev->dev.parent = dev;
        input_dev->id.product = ac->model;
        input_dev->id.bustype = bops->bustype;
        input_dev->open = adxl34x_input_open;
        input_dev->close = adxl34x_input_close;

        input_set_drvdata(input_dev, ac);

        __set_bit(ac->pdata.ev_type, input_dev->evbit);

        if (ac->pdata.ev_type == EV_REL) {
                __set_bit(REL_X, input_dev->relbit);
                __set_bit(REL_Y, input_dev->relbit);
                __set_bit(REL_Z, input_dev->relbit);
        } else {
                /* EV_ABS */
                __set_bit(ABS_X, input_dev->absbit);
                __set_bit(ABS_Y, input_dev->absbit);
                __set_bit(ABS_Z, input_dev->absbit);

                if (pdata->data_range & FULL_RES)
                        range = ADXL_FULLRES_MAX_VAL;   /* Signed 13-bit */
                else
                        range = ADXL_FIXEDRES_MAX_VAL;  /* Signed 10-bit */

                input_set_abs_params(input_dev, ABS_X, -range, range, 3, 3);
                input_set_abs_params(input_dev, ABS_Y, -range, range, 3, 3);
                input_set_abs_params(input_dev, ABS_Z, -range, range, 3, 3);
        }

        __set_bit(EV_KEY, input_dev->evbit);
        __set_bit(pdata->ev_code_tap[ADXL_X_AXIS], input_dev->keybit);
        __set_bit(pdata->ev_code_tap[ADXL_Y_AXIS], input_dev->keybit);
        __set_bit(pdata->ev_code_tap[ADXL_Z_AXIS], input_dev->keybit);

        if (pdata->ev_code_ff) {
                ac->int_mask = FREE_FALL;
                __set_bit(pdata->ev_code_ff, input_dev->keybit);
        }

        if (pdata->ev_code_act_inactivity)
                __set_bit(pdata->ev_code_act_inactivity, input_dev->keybit);

        ac->int_mask |= ACTIVITY | INACTIVITY;

        if (pdata->watermark) {
                ac->int_mask |= WATERMARK;
                if (!FIFO_MODE(pdata->fifo_mode))
                        ac->pdata.fifo_mode |= FIFO_STREAM;
        } else {
                ac->int_mask |= DATA_READY;
        }

        if (pdata->tap_axis_control & (TAP_X_EN | TAP_Y_EN | TAP_Z_EN))
                ac->int_mask |= SINGLE_TAP | DOUBLE_TAP;

        if (FIFO_MODE(pdata->fifo_mode) == FIFO_BYPASS)
                ac->fifo_delay = false;

        AC_WRITE(ac, POWER_CTL, 0);

        err = request_threaded_irq(ac->irq, NULL, adxl34x_irq,
                                   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
                                   dev_name(dev), ac);
        if (err) {
                dev_err(dev, "irq %d busy?\n", ac->irq);
                goto err_free_mem;
        }

        err = sysfs_create_group(&dev->kobj, &adxl34x_attr_group);
        if (err)
                goto err_free_irq;

        err = input_register_device(input_dev);
        if (err)
                goto err_remove_attr;

        AC_WRITE(ac, OFSX, pdata->x_axis_offset);
        ac->hwcal.x = pdata->x_axis_offset;
        AC_WRITE(ac, OFSY, pdata->y_axis_offset);
        ac->hwcal.y = pdata->y_axis_offset;
        AC_WRITE(ac, OFSZ, pdata->z_axis_offset);
        ac->hwcal.z = pdata->z_axis_offset;
        AC_WRITE(ac, THRESH_TAP, pdata->tap_threshold);
        AC_WRITE(ac, DUR, pdata->tap_duration);
        AC_WRITE(ac, LATENT, pdata->tap_latency);
        AC_WRITE(ac, WINDOW, pdata->tap_window);
        AC_WRITE(ac, THRESH_ACT, pdata->activity_threshold);
        AC_WRITE(ac, THRESH_INACT, pdata->inactivity_threshold);
        AC_WRITE(ac, TIME_INACT, pdata->inactivity_time);
        AC_WRITE(ac, THRESH_FF, pdata->free_fall_threshold);
        AC_WRITE(ac, TIME_FF, pdata->free_fall_time);
        AC_WRITE(ac, TAP_AXES, pdata->tap_axis_control);
        AC_WRITE(ac, ACT_INACT_CTL, pdata->act_axis_control);
        AC_WRITE(ac, BW_RATE, RATE(ac->pdata.data_rate) |
                 (pdata->low_power_mode ? LOW_POWER : 0));
        AC_WRITE(ac, DATA_FORMAT, pdata->data_range);
        AC_WRITE(ac, FIFO_CTL, FIFO_MODE(pdata->fifo_mode) |
                        SAMPLES(pdata->watermark));

        if (pdata->use_int2) {
                /* Map all INTs to INT2 */
                AC_WRITE(ac, INT_MAP, ac->int_mask | OVERRUN);
        } else {
                /* Map all INTs to INT1 */
                AC_WRITE(ac, INT_MAP, 0);
        }

        if (ac->model == 346 && ac->pdata.orientation_enable) {
                AC_WRITE(ac, ORIENT_CONF,
                        ORIENT_DEADZONE(ac->pdata.deadzone_angle) |
                        ORIENT_DIVISOR(ac->pdata.divisor_length));

                ac->orient2d_saved = 1234;
                ac->orient3d_saved = 1234;

                if (pdata->orientation_enable & ADXL_EN_ORIENTATION_3D)
                        for (i = 0; i < ARRAY_SIZE(pdata->ev_codes_orient_3d); i++)
                                __set_bit(pdata->ev_codes_orient_3d[i],
                                          input_dev->keybit);

                if (pdata->orientation_enable & ADXL_EN_ORIENTATION_2D)
                        for (i = 0; i < ARRAY_SIZE(pdata->ev_codes_orient_2d); i++)
                                __set_bit(pdata->ev_codes_orient_2d[i],
                                          input_dev->keybit);
        } else {
                ac->pdata.orientation_enable = 0;
        }

        AC_WRITE(ac, INT_ENABLE, ac->int_mask | OVERRUN);

        ac->pdata.power_mode &= (PCTL_AUTO_SLEEP | PCTL_LINK);

        return ac;

 err_remove_attr:
        sysfs_remove_group(&dev->kobj, &adxl34x_attr_group);
 err_free_irq:
        free_irq(ac->irq, ac);
 err_free_mem:
        input_free_device(input_dev);
        kfree(ac);
 err_out:
        return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(adxl34x_probe);

int adxl34x_remove(struct adxl34x *ac)
{
        sysfs_remove_group(&ac->dev->kobj, &adxl34x_attr_group);
        free_irq(ac->irq, ac);
        input_unregister_device(ac->input);
        dev_dbg(ac->dev, "unregistered accelerometer\n");
        kfree(ac);

        return 0;
}
EXPORT_SYMBOL_GPL(adxl34x_remove);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer Driver");
MODULE_LICENSE("GPL");