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Release 4.11 drivers/input/misc/adxl34x.c

Directory: drivers/input/misc
/*
 * 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/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);
}


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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);
}


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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);
}


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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);
	}
}


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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);
}


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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;
}


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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);
}


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


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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);
}

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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);
}

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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);
}


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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;
}


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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;
}


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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;
}


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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));
}


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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;
}


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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);
}


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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;
}


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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;
}


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Michael Hennerich79100.00%1100.00%


Total79100.00%1100.00%



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 *