--- /dev/null
+/*
+ * 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 "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];
+ bool disabled; /* P: mutex */
+ bool opened; /* 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 = 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;
+
+ /*
+ * 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);
+ }
+
+ 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)
+{
+ if (!ac->disabled && ac->opened) {
+ /*
+ * A '0' places the ADXL34x into standby mode
+ * with minimum power consumption.
+ */
+ AC_WRITE(ac, POWER_CTL, 0);
+
+ ac->disabled = true;
+ }
+}
+
+static void __adxl34x_enable(struct adxl34x *ac)
+{
+ if (ac->disabled && ac->opened) {
+ AC_WRITE(ac, POWER_CTL, ac->pdata.power_mode | PCTL_MEASURE);
+ ac->disabled = false;
+ }
+}
+
+void adxl34x_disable(struct adxl34x *ac)
+{
+ mutex_lock(&ac->mutex);
+ __adxl34x_disable(ac);
+ mutex_unlock(&ac->mutex);
+}
+EXPORT_SYMBOL_GPL(adxl34x_disable);
+
+void adxl34x_enable(struct adxl34x *ac)
+{
+ mutex_lock(&ac->mutex);
+ __adxl34x_enable(ac);
+ mutex_unlock(&ac->mutex);
+}
+
+EXPORT_SYMBOL_GPL(adxl34x_enable);
+
+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 long val;
+ int error;
+
+ error = strict_strtoul(buf, 10, &val);
+ if (error)
+ return error;
+
+ if (val)
+ adxl34x_disable(ac);
+ else
+ adxl34x_enable(ac);
+
+ 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 long val;
+ int error;
+
+ error = strict_strtoul(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 long val;
+ int error;
+
+ error = strict_strtoul(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->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 long val;
+ int error;
+
+ /*
+ * This allows basic ADXL register write access for debug purposes.
+ */
+ error = strict_strtoul(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);
+ ac->opened = true;
+ __adxl34x_enable(ac);
+ 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);
+ __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;
+ 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_out;
+ }
+
+ ac->fifo_delay = fifo_delay_default;
+
+ pdata = dev->platform_data;
+ if (!pdata) {
+ dev_dbg(dev,
+ "No platfrom data: Using default initialization\n");
+ pdata = &adxl34x_default_init;
+ }
+
+ ac->pdata = *pdata;
+ pdata = &ac->pdata;
+
+ ac->input = input_dev;
+ ac->disabled = true;
+ ac->dev = dev;
+ ac->irq = irq;
+ ac->bops = bops;
+
+ mutex_init(&ac->mutex);
+
+ input_dev->name = "ADXL34x accelerometer";
+ revid = ac->bops->read(dev, 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->bops->write(dev, 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, THRESH_TAP, pdata->tap_threshold);
+ 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);
+
+ 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)
+{
+ adxl34x_disable(ac);
+ sysfs_remove_group(&ac->dev->kobj, &adxl34x_attr_group);
+ free_irq(ac->irq, ac);
+ input_unregister_device(ac->input);
+ kfree(ac);
+
+ dev_dbg(ac->dev, "unregistered accelerometer\n");
+ 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");
--- /dev/null
+/*
+ * include/linux/input/adxl34x.h
+ *
+ * Digital Accelerometer characteristics are highly application specific
+ * and may vary between boards and models. The platform_data for the
+ * device's "struct device" holds this information.
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __LINUX_INPUT_ADXL34X_H__
+#define __LINUX_INPUT_ADXL34X_H__
+
+struct adxl34x_platform_data {
+
+ /*
+ * X,Y,Z Axis Offset:
+ * offer user offset adjustments in twoscompliment
+ * form with a scale factor of 15.6 mg/LSB (i.e. 0x7F = +2 g)
+ */
+
+ s8 x_axis_offset;
+ s8 y_axis_offset;
+ s8 z_axis_offset;
+
+ /*
+ * TAP_X/Y/Z Enable: Setting TAP_X, Y, or Z Enable enables X,
+ * Y, or Z participation in Tap detection. A '0' excludes the
+ * selected axis from participation in Tap detection.
+ * Setting the SUPPRESS bit suppresses Double Tap detection if
+ * acceleration greater than tap_threshold is present between
+ * taps.
+ */
+
+#define ADXL_SUPPRESS (1 << 3)
+#define ADXL_TAP_X_EN (1 << 2)
+#define ADXL_TAP_Y_EN (1 << 1)
+#define ADXL_TAP_Z_EN (1 << 0)
+
+ u8 tap_axis_control;
+
+ /*
+ * tap_threshold:
+ * holds the threshold value for tap detection/interrupts.
+ * The data format is unsigned. The scale factor is 62.5 mg/LSB
+ * (i.e. 0xFF = +16 g). A zero value may result in undesirable
+ * behavior if Tap/Double Tap is enabled.
+ */
+
+ u8 tap_threshold;
+
+ /*
+ * tap_duration:
+ * is an unsigned time value representing the maximum
+ * time that an event must be above the tap_threshold threshold
+ * to qualify as a tap event. The scale factor is 625 us/LSB. A zero
+ * value will prevent Tap/Double Tap functions from working.
+ */
+
+ u8 tap_duration;
+
+ /*
+ * tap_latency:
+ * is an unsigned time value representing the wait time
+ * from the detection of a tap event to the opening of the time
+ * window tap_window for a possible second tap event. The scale
+ * factor is 1.25 ms/LSB. A zero value will disable the Double Tap
+ * function.
+ */
+
+ u8 tap_latency;
+
+ /*
+ * tap_window:
+ * is an unsigned time value representing the amount
+ * of time after the expiration of tap_latency during which a second
+ * tap can begin. The scale factor is 1.25 ms/LSB. A zero value will
+ * disable the Double Tap function.
+ */
+
+ u8 tap_window;
+
+ /*
+ * act_axis_control:
+ * X/Y/Z Enable: A '1' enables X, Y, or Z participation in activity
+ * or inactivity detection. A '0' excludes the selected axis from
+ * participation. If all of the axes are excluded, the function is
+ * disabled.
+ * AC/DC: A '0' = DC coupled operation and a '1' = AC coupled
+ * operation. In DC coupled operation, the current acceleration is
+ * compared with activity_threshold and inactivity_threshold directly
+ * to determine whether activity or inactivity is detected. In AC
+ * coupled operation for activity detection, the acceleration value
+ * at the start of activity detection is taken as a reference value.
+ * New samples of acceleration are then compared to this
+ * reference value and if the magnitude of the difference exceeds
+ * activity_threshold the device will trigger an activity interrupt. In
+ * AC coupled operation for inactivity detection, a reference value
+ * is used again for comparison and is updated whenever the
+ * device exceeds the inactivity threshold. Once the reference
+ * value is selected, the device compares the magnitude of the
+ * difference between the reference value and the current
+ * acceleration with inactivity_threshold. If the difference is below
+ * inactivity_threshold for a total of inactivity_time, the device is
+ * considered inactive and the inactivity interrupt is triggered.
+ */
+
+#define ADXL_ACT_ACDC (1 << 7)
+#define ADXL_ACT_X_EN (1 << 6)
+#define ADXL_ACT_Y_EN (1 << 5)
+#define ADXL_ACT_Z_EN (1 << 4)
+#define ADXL_INACT_ACDC (1 << 3)
+#define ADXL_INACT_X_EN (1 << 2)
+#define ADXL_INACT_Y_EN (1 << 1)
+#define ADXL_INACT_Z_EN (1 << 0)
+
+ u8 act_axis_control;
+
+ /*
+ * activity_threshold:
+ * holds the threshold value for activity detection.
+ * The data format is unsigned. The scale factor is
+ * 62.5 mg/LSB. A zero value may result in undesirable behavior if
+ * Activity interrupt is enabled.
+ */
+
+ u8 activity_threshold;
+
+ /*
+ * inactivity_threshold:
+ * holds the threshold value for inactivity
+ * detection. The data format is unsigned. The scale
+ * factor is 62.5 mg/LSB. A zero value may result in undesirable
+ * behavior if Inactivity interrupt is enabled.
+ */
+
+ u8 inactivity_threshold;
+
+ /*
+ * inactivity_time:
+ * is an unsigned time value representing the
+ * amount of time that acceleration must be below the value in
+ * inactivity_threshold for inactivity to be declared. The scale factor
+ * is 1 second/LSB. Unlike the other interrupt functions, which
+ * operate on unfiltered data, the inactivity function operates on the
+ * filtered output data. At least one output sample must be
+ * generated for the inactivity interrupt to be triggered. This will
+ * result in the function appearing un-responsive if the
+ * inactivity_time register is set with a value less than the time
+ * constant of the Output Data Rate. A zero value will result in an
+ * interrupt when the output data is below inactivity_threshold.
+ */
+
+ u8 inactivity_time;
+
+ /*
+ * free_fall_threshold:
+ * holds the threshold value for Free-Fall detection.
+ * The data format is unsigned. The root-sum-square(RSS) value
+ * of all axes is calculated and compared to the value in
+ * free_fall_threshold to determine if a free fall event may be
+ * occurring. The scale factor is 62.5 mg/LSB. A zero value may
+ * result in undesirable behavior if Free-Fall interrupt is
+ * enabled. Values between 300 and 600 mg (0x05 to 0x09) are
+ * recommended.
+ */
+
+ u8 free_fall_threshold;
+
+ /*
+ * free_fall_time:
+ * is an unsigned time value representing the minimum
+ * time that the RSS value of all axes must be less than
+ * free_fall_threshold to generate a Free-Fall interrupt. The
+ * scale factor is 5 ms/LSB. A zero value may result in
+ * undesirable behavior if Free-Fall interrupt is enabled.
+ * Values between 100 to 350 ms (0x14 to 0x46) are recommended.
+ */
+
+ u8 free_fall_time;
+
+ /*
+ * data_rate:
+ * Selects device bandwidth and output data rate.
+ * RATE = 3200 Hz / (2^(15 - x)). Default value is 0x0A, or 100 Hz
+ * Output Data Rate. An Output Data Rate should be selected that
+ * is appropriate for the communication protocol and frequency
+ * selected. Selecting too high of an Output Data Rate with a low
+ * communication speed will result in samples being discarded.
+ */
+
+ u8 data_rate;
+
+ /*
+ * data_range:
+ * FULL_RES: When this bit is set with the device is
+ * in Full-Resolution Mode, where the output resolution increases
+ * with RANGE to maintain a 4 mg/LSB scale factor. When this
+ * bit is cleared the device is in 10-bit Mode and RANGE determine the
+ * maximum g-Range and scale factor.
+ */
+
+#define ADXL_FULL_RES (1 << 3)
+#define ADXL_RANGE_PM_2g 0
+#define ADXL_RANGE_PM_4g 1
+#define ADXL_RANGE_PM_8g 2
+#define ADXL_RANGE_PM_16g 3
+
+ u8 data_range;
+
+ /*
+ * low_power_mode:
+ * A '0' = Normal operation and a '1' = Reduced
+ * power operation with somewhat higher noise.
+ */
+
+ u8 low_power_mode;
+
+ /*
+ * power_mode:
+ * LINK: A '1' with both the activity and inactivity functions
+ * enabled will delay the start of the activity function until
+ * inactivity is detected. Once activity is detected, inactivity
+ * detection will begin and prevent the detection of activity. This
+ * bit serially links the activity and inactivity functions. When '0'
+ * the inactivity and activity functions are concurrent. Additional
+ * information can be found in the Application section under Link
+ * Mode.
+ * AUTO_SLEEP: A '1' sets the ADXL34x to switch to Sleep Mode
+ * when inactivity (acceleration has been below inactivity_threshold
+ * for at least inactivity_time) is detected and the LINK bit is set.
+ * A '0' disables automatic switching to Sleep Mode. See SLEEP
+ * for further description.
+ */
+
+#define ADXL_LINK (1 << 5)
+#define ADXL_AUTO_SLEEP (1 << 4)
+
+ u8 power_mode;
+
+ /*
+ * fifo_mode:
+ * BYPASS The FIFO is bypassed
+ * FIFO FIFO collects up to 32 values then stops collecting data
+ * STREAM FIFO holds the last 32 data values. Once full, the FIFO's
+ * oldest data is lost as it is replaced with newer data
+ *
+ * DEFAULT should be ADXL_FIFO_STREAM
+ */
+
+#define ADXL_FIFO_BYPASS 0
+#define ADXL_FIFO_FIFO 1
+#define ADXL_FIFO_STREAM 2
+
+ u8 fifo_mode;
+
+ /*
+ * watermark:
+ * The Watermark feature can be used to reduce the interrupt load
+ * of the system. The FIFO fills up to the value stored in watermark
+ * [1..32] and then generates an interrupt.
+ * A '0' disables the watermark feature.
+ */
+
+ u8 watermark;
+
+ u32 ev_type; /* EV_ABS or EV_REL */
+
+ u32 ev_code_x; /* ABS_X,Y,Z or REL_X,Y,Z */
+ u32 ev_code_y; /* ABS_X,Y,Z or REL_X,Y,Z */
+ u32 ev_code_z; /* ABS_X,Y,Z or REL_X,Y,Z */
+
+ /*
+ * A valid BTN or KEY Code; use tap_axis_control to disable
+ * event reporting
+ */
+
+ u32 ev_code_tap[3]; /* EV_KEY {X-Axis, Y-Axis, Z-Axis} */
+
+ /*
+ * A valid BTN or KEY Code for Free-Fall or Activity enables
+ * input event reporting. A '0' disables the Free-Fall or
+ * Activity reporting.
+ */
+
+ u32 ev_code_ff; /* EV_KEY */
+ u32 ev_code_act_inactivity; /* EV_KEY */
+
+ u8 use_int2;
+};
+#endif
projects / deliverable / linux.git / commitdiff
