/*
* ADXL345/346 Three-Axis Digital Accelerometers
*/
#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) & 0x30) >> 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_ke