Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1266 insertions, 0 deletions

diff --git a/drivers/misc/lis3lv02d/lis3lv02d.c b/drivers/misc/lis3lv02d/lis3lv02d.c
new file mode 100644
index 000000000..3a7808b79
--- /dev/null
+++ b/drivers/misc/lis3lv02d/lis3lv02d.c
@@ -0,0 +1,1266 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  lis3lv02d.c - ST LIS3LV02DL accelerometer driver
+ *
+ *  Copyright (C) 2007-2008 Yan Burman
+ *  Copyright (C) 2008 Eric Piel
+ *  Copyright (C) 2008-2009 Pavel Machek
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/sched/signal.h>
+#include <linux/dmi.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/freezer.h>
+#include <linux/uaccess.h>
+#include <linux/miscdevice.h>
+#include <linux/pm_runtime.h>
+#include <linux/atomic.h>
+#include <linux/of_device.h>
+#include "lis3lv02d.h"
+
+#define DRIVER_NAME     "lis3lv02d"
+
+/* joystick device poll interval in milliseconds */
+#define MDPS_POLL_INTERVAL 50
+#define MDPS_POLL_MIN	   0
+#define MDPS_POLL_MAX	   2000
+
+#define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */
+
+#define SELFTEST_OK	       0
+#define SELFTEST_FAIL	       -1
+#define SELFTEST_IRQ	       -2
+
+#define IRQ_LINE0	       0
+#define IRQ_LINE1	       1
+
+/*
+ * The sensor can also generate interrupts (DRDY) but it's pretty pointless
+ * because they are generated even if the data do not change. So it's better
+ * to keep the interrupt for the free-fall event. The values are updated at
+ * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
+ * some low processor, we poll the sensor only at 20Hz... enough for the
+ * joystick.
+ */
+
+#define LIS3_PWRON_DELAY_WAI_12B	(5000)
+#define LIS3_PWRON_DELAY_WAI_8B		(3000)
+
+/*
+ * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG
+ * LIS302D spec says: 18 mG / digit
+ * LIS3_ACCURACY is used to increase accuracy of the intermediate
+ * calculation results.
+ */
+#define LIS3_ACCURACY			1024
+/* Sensitivity values for -2G +2G scale */
+#define LIS3_SENSITIVITY_12B		((LIS3_ACCURACY * 1000) / 1024)
+#define LIS3_SENSITIVITY_8B		(18 * LIS3_ACCURACY)
+
+/*
+ * LIS331DLH spec says 1LSBs corresponds 4G/4096 -> 1LSB is 1000/1024 mG.
+ * Below macros defines sensitivity values for +/-2G. Dataout bits for
+ * +/-2G range is 12 bits so 4 bits adjustment must be done to get 12bit
+ * data from 16bit value. Currently this driver supports only 2G range.
+ */
+#define LIS3DLH_SENSITIVITY_2G		((LIS3_ACCURACY * 1000) / 1024)
+#define SHIFT_ADJ_2G			4
+
+#define LIS3_DEFAULT_FUZZ_12B		3
+#define LIS3_DEFAULT_FLAT_12B		3
+#define LIS3_DEFAULT_FUZZ_8B		1
+#define LIS3_DEFAULT_FLAT_8B		1
+
+struct lis3lv02d lis3_dev = {
+	.misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
+};
+EXPORT_SYMBOL_GPL(lis3_dev);
+
+/* just like param_set_int() but does sanity-check so that it won't point
+ * over the axis array size
+ */
+static int param_set_axis(const char *val, const struct kernel_param *kp)
+{
+	int ret = param_set_int(val, kp);
+	if (!ret) {
+		int val = *(int *)kp->arg;
+		if (val < 0)
+			val = -val;
+		if (!val || val > 3)
+			return -EINVAL;
+	}
+	return ret;
+}
+
+static const struct kernel_param_ops param_ops_axis = {
+	.set = param_set_axis,
+	.get = param_get_int,
+};
+
+#define param_check_axis(name, p) param_check_int(name, p)
+
+module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
+MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
+
+static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
+{
+	s8 lo;
+	if (lis3->read(lis3, reg, &lo) < 0)
+		return 0;
+
+	return lo;
+}
+
+static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
+{
+	u8 lo, hi;
+
+	lis3->read(lis3, reg - 1, &lo);
+	lis3->read(lis3, reg, &hi);
+	/* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
+	return (s16)((hi << 8) | lo);
+}
+
+/* 12bits for 2G range, 13 bits for 4G range and 14 bits for 8G range */
+static s16 lis331dlh_read_data(struct lis3lv02d *lis3, int reg)
+{
+	u8 lo, hi;
+	int v;
+
+	lis3->read(lis3, reg - 1, &lo);
+	lis3->read(lis3, reg, &hi);
+	v = (int) ((hi << 8) | lo);
+
+	return (s16) v >> lis3->shift_adj;
+}
+
+/**
+ * lis3lv02d_get_axis - For the given axis, give the value converted
+ * @axis:      1,2,3 - can also be negative
+ * @hw_values: raw values returned by the hardware
+ *
+ * Returns the converted value.
+ */
+static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
+{
+	if (axis > 0)
+		return hw_values[axis - 1];
+	else
+		return -hw_values[-axis - 1];
+}
+
+/**
+ * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
+ * @lis3: pointer to the device struct
+ * @x:    where to store the X axis value
+ * @y:    where to store the Y axis value
+ * @z:    where to store the Z axis value
+ *
+ * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
+ */
+static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
+{
+	int position[3];
+	int i;
+
+	if (lis3->blkread) {
+		if (lis3->whoami == WAI_12B) {
+			u16 data[3];
+			lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
+			for (i = 0; i < 3; i++)
+				position[i] = (s16)le16_to_cpu(data[i]);
+		} else {
+			u8 data[5];
+			/* Data: x, dummy, y, dummy, z */
+			lis3->blkread(lis3, OUTX, 5, data);
+			for (i = 0; i < 3; i++)
+				position[i] = (s8)data[i * 2];
+		}
+	} else {
+		position[0] = lis3->read_data(lis3, OUTX);
+		position[1] = lis3->read_data(lis3, OUTY);
+		position[2] = lis3->read_data(lis3, OUTZ);
+	}
+
+	for (i = 0; i < 3; i++)
+		position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
+
+	*x = lis3lv02d_get_axis(lis3->ac.x, position);
+	*y = lis3lv02d_get_axis(lis3->ac.y, position);
+	*z = lis3lv02d_get_axis(lis3->ac.z, position);
+}
+
+/* conversion btw sampling rate and the register values */
+static int lis3_12_rates[4] = {40, 160, 640, 2560};
+static int lis3_8_rates[2] = {100, 400};
+static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
+static int lis3_3dlh_rates[4] = {50, 100, 400, 1000};
+
+/* ODR is Output Data Rate */
+static int lis3lv02d_get_odr_index(struct lis3lv02d *lis3)
+{
+	u8 ctrl;
+	int shift;
+
+	lis3->read(lis3, CTRL_REG1, &ctrl);
+	ctrl &= lis3->odr_mask;
+	shift = ffs(lis3->odr_mask) - 1;
+	return (ctrl >> shift);
+}
+
+static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
+{
+	int odr_idx = lis3lv02d_get_odr_index(lis3);
+	int div = lis3->odrs[odr_idx];
+
+	if (div == 0) {
+		if (odr_idx == 0) {
+			/* Power-down mode, not sampling no need to sleep */
+			return 0;
+		}
+
+		dev_err(&lis3->pdev->dev, "Error unknown odrs-index: %d\n", odr_idx);
+		return -ENXIO;
+	}
+
+	/* LIS3 power on delay is quite long */
+	msleep(lis3->pwron_delay / div);
+	return 0;
+}
+
+static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate)
+{
+	u8 ctrl;
+	int i, len, shift;
+
+	if (!rate)
+		return -EINVAL;
+
+	lis3->read(lis3, CTRL_REG1, &ctrl);
+	ctrl &= ~lis3->odr_mask;
+	len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */
+	shift = ffs(lis3->odr_mask) - 1;
+
+	for (i = 0; i < len; i++)
+		if (lis3->odrs[i] == rate) {
+			lis3->write(lis3, CTRL_REG1,
+					ctrl | (i << shift));
+			return 0;
+		}
+	return -EINVAL;
+}
+
+static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
+{
+	u8 ctlreg, reg;
+	s16 x, y, z;
+	u8 selftest;
+	int ret;
+	u8 ctrl_reg_data;
+	unsigned char irq_cfg;
+
+	mutex_lock(&lis3->mutex);
+
+	irq_cfg = lis3->irq_cfg;
+	if (lis3->whoami == WAI_8B) {
+		lis3->data_ready_count[IRQ_LINE0] = 0;
+		lis3->data_ready_count[IRQ_LINE1] = 0;
+
+		/* Change interrupt cfg to data ready for selftest */
+		atomic_inc(&lis3->wake_thread);
+		lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
+		lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
+		lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
+				~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
+				(LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
+	}
+
+	if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) {
+		ctlreg = CTRL_REG4;
+		selftest = CTRL4_ST0;
+	} else {
+		ctlreg = CTRL_REG1;
+		if (lis3->whoami == WAI_12B)
+			selftest = CTRL1_ST;
+		else
+			selftest = CTRL1_STP;
+	}
+
+	lis3->read(lis3, ctlreg, &reg);
+	lis3->write(lis3, ctlreg, (reg | selftest));
+	ret = lis3lv02d_get_pwron_wait(lis3);
+	if (ret)
+		goto fail;
+
+	/* Read directly to avoid axis remap */
+	x = lis3->read_data(lis3, OUTX);
+	y = lis3->read_data(lis3, OUTY);
+	z = lis3->read_data(lis3, OUTZ);
+
+	/* back to normal settings */
+	lis3->write(lis3, ctlreg, reg);
+	ret = lis3lv02d_get_pwron_wait(lis3);
+	if (ret)
+		goto fail;
+
+	results[0] = x - lis3->read_data(lis3, OUTX);
+	results[1] = y - lis3->read_data(lis3, OUTY);
+	results[2] = z - lis3->read_data(lis3, OUTZ);
+
+	ret = 0;
+
+	if (lis3->whoami == WAI_8B) {
+		/* Restore original interrupt configuration */
+		atomic_dec(&lis3->wake_thread);
+		lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
+		lis3->irq_cfg = irq_cfg;
+
+		if ((irq_cfg & LIS3_IRQ1_MASK) &&
+			lis3->data_ready_count[IRQ_LINE0] < 2) {
+			ret = SELFTEST_IRQ;
+			goto fail;
+		}
+
+		if ((irq_cfg & LIS3_IRQ2_MASK) &&
+			lis3->data_ready_count[IRQ_LINE1] < 2) {
+			ret = SELFTEST_IRQ;
+			goto fail;
+		}
+	}
+
+	if (lis3->pdata) {
+		int i;
+		for (i = 0; i < 3; i++) {
+			/* Check against selftest acceptance limits */
+			if ((results[i] < lis3->pdata->st_min_limits[i]) ||
+			    (results[i] > lis3->pdata->st_max_limits[i])) {
+				ret = SELFTEST_FAIL;
+				goto fail;
+			}
+		}
+	}
+
+	/* test passed */
+fail:
+	mutex_unlock(&lis3->mutex);
+	return ret;
+}
+
+/*
+ * Order of registers in the list affects to order of the restore process.
+ * Perhaps it is a good idea to set interrupt enable register as a last one
+ * after all other configurations
+ */
+static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
+			       FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
+			       CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
+			       CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
+			       CTRL_REG1, CTRL_REG2, CTRL_REG3};
+
+static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
+			       FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
+			       DD_THSE_L, DD_THSE_H,
+			       CTRL_REG1, CTRL_REG3, CTRL_REG2};
+
+static inline void lis3_context_save(struct lis3lv02d *lis3)
+{
+	int i;
+	for (i = 0; i < lis3->regs_size; i++)
+		lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
+	lis3->regs_stored = true;
+}
+
+static inline void lis3_context_restore(struct lis3lv02d *lis3)
+{
+	int i;
+	if (lis3->regs_stored)
+		for (i = 0; i < lis3->regs_size; i++)
+			lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
+}
+
+void lis3lv02d_poweroff(struct lis3lv02d *lis3)
+{
+	if (lis3->reg_ctrl)
+		lis3_context_save(lis3);
+	/* disable X,Y,Z axis and power down */
+	lis3->write(lis3, CTRL_REG1, 0x00);
+	if (lis3->reg_ctrl)
+		lis3->reg_ctrl(lis3, LIS3_REG_OFF);
+}
+EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
+
+int lis3lv02d_poweron(struct lis3lv02d *lis3)
+{
+	int err;
+	u8 reg;
+
+	lis3->init(lis3);
+
+	/*
+	 * Common configuration
+	 * BDU: (12 bits sensors only) LSB and MSB values are not updated until
+	 *      both have been read. So the value read will always be correct.
+	 * Set BOOT bit to refresh factory tuning values.
+	 */
+	if (lis3->pdata) {
+		lis3->read(lis3, CTRL_REG2, &reg);
+		if (lis3->whoami ==  WAI_12B)
+			reg |= CTRL2_BDU | CTRL2_BOOT;
+		else if (lis3->whoami ==  WAI_3DLH)
+			reg |= CTRL2_BOOT_3DLH;
+		else
+			reg |= CTRL2_BOOT_8B;
+		lis3->write(lis3, CTRL_REG2, reg);
+
+		if (lis3->whoami ==  WAI_3DLH) {
+			lis3->read(lis3, CTRL_REG4, &reg);
+			reg |= CTRL4_BDU;
+			lis3->write(lis3, CTRL_REG4, reg);
+		}
+	}
+
+	err = lis3lv02d_get_pwron_wait(lis3);
+	if (err)
+		return err;
+
+	if (lis3->reg_ctrl)
+		lis3_context_restore(lis3);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
+
+
+static void lis3lv02d_joystick_poll(struct input_dev *input)
+{
+	struct lis3lv02d *lis3 = input_get_drvdata(input);
+	int x, y, z;
+
+	mutex_lock(&lis3->mutex);
+	lis3lv02d_get_xyz(lis3, &x, &y, &z);
+	input_report_abs(input, ABS_X, x);
+	input_report_abs(input, ABS_Y, y);
+	input_report_abs(input, ABS_Z, z);
+	input_sync(input);
+	mutex_unlock(&lis3->mutex);
+}
+
+static int lis3lv02d_joystick_open(struct input_dev *input)
+{
+	struct lis3lv02d *lis3 = input_get_drvdata(input);
+
+	if (lis3->pm_dev)
+		pm_runtime_get_sync(lis3->pm_dev);
+
+	if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev)
+		atomic_set(&lis3->wake_thread, 1);
+	/*
+	 * Update coordinates for the case where poll interval is 0 and
+	 * the chip in running purely under interrupt control
+	 */
+	lis3lv02d_joystick_poll(input);
+
+	return 0;
+}
+
+static void lis3lv02d_joystick_close(struct input_dev *input)
+{
+	struct lis3lv02d *lis3 = input_get_drvdata(input);
+
+	atomic_set(&lis3->wake_thread, 0);
+	if (lis3->pm_dev)
+		pm_runtime_put(lis3->pm_dev);
+}
+
+static irqreturn_t lis302dl_interrupt(int irq, void *data)
+{
+	struct lis3lv02d *lis3 = data;
+
+	if (!test_bit(0, &lis3->misc_opened))
+		goto out;
+
+	/*
+	 * Be careful: on some HP laptops the bios force DD when on battery and
+	 * the lid is closed. This leads to interrupts as soon as a little move
+	 * is done.
+	 */
+	atomic_inc(&lis3->count);
+
+	wake_up_interruptible(&lis3->misc_wait);
+	kill_fasync(&lis3->async_queue, SIGIO, POLL_IN);
+out:
+	if (atomic_read(&lis3->wake_thread))
+		return IRQ_WAKE_THREAD;
+	return IRQ_HANDLED;
+}
+
+static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
+{
+	struct input_dev *dev = lis3->idev;
+	u8 click_src;
+
+	mutex_lock(&lis3->mutex);
+	lis3->read(lis3, CLICK_SRC, &click_src);
+
+	if (click_src & CLICK_SINGLE_X) {
+		input_report_key(dev, lis3->mapped_btns[0], 1);
+		input_report_key(dev, lis3->mapped_btns[0], 0);
+	}
+
+	if (click_src & CLICK_SINGLE_Y) {
+		input_report_key(dev, lis3->mapped_btns[1], 1);
+		input_report_key(dev, lis3->mapped_btns[1], 0);
+	}
+
+	if (click_src & CLICK_SINGLE_Z) {
+		input_report_key(dev, lis3->mapped_btns[2], 1);
+		input_report_key(dev, lis3->mapped_btns[2], 0);
+	}
+	input_sync(dev);
+	mutex_unlock(&lis3->mutex);
+}
+
+static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
+{
+	int dummy;
+
+	/* Dummy read to ack interrupt */
+	lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
+	lis3->data_ready_count[index]++;
+}
+
+static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
+{
+	struct lis3lv02d *lis3 = data;
+	u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
+
+	if (irq_cfg == LIS3_IRQ1_CLICK)
+		lis302dl_interrupt_handle_click(lis3);
+	else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
+		lis302dl_data_ready(lis3, IRQ_LINE0);
+	else
+		lis3lv02d_joystick_poll(lis3->idev);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
+{
+	struct lis3lv02d *lis3 = data;
+	u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
+
+	if (irq_cfg == LIS3_IRQ2_CLICK)
+		lis302dl_interrupt_handle_click(lis3);
+	else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
+		lis302dl_data_ready(lis3, IRQ_LINE1);
+	else
+		lis3lv02d_joystick_poll(lis3->idev);
+
+	return IRQ_HANDLED;
+}
+
+static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
+{
+	struct lis3lv02d *lis3 = container_of(file->private_data,
+					      struct lis3lv02d, miscdev);
+
+	if (test_and_set_bit(0, &lis3->misc_opened))
+		return -EBUSY; /* already open */
+
+	if (lis3->pm_dev)
+		pm_runtime_get_sync(lis3->pm_dev);
+
+	atomic_set(&lis3->count, 0);
+	return 0;
+}
+
+static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
+{
+	struct lis3lv02d *lis3 = container_of(file->private_data,
+					      struct lis3lv02d, miscdev);
+
+	clear_bit(0, &lis3->misc_opened); /* release the device */
+	if (lis3->pm_dev)
+		pm_runtime_put(lis3->pm_dev);
+	return 0;
+}
+
+static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
+				size_t count, loff_t *pos)
+{
+	struct lis3lv02d *lis3 = container_of(file->private_data,
+					      struct lis3lv02d, miscdev);
+
+	DECLARE_WAITQUEUE(wait, current);
+	u32 data;
+	unsigned char byte_data;
+	ssize_t retval = 1;
+
+	if (count < 1)
+		return -EINVAL;
+
+	add_wait_queue(&lis3->misc_wait, &wait);
+	while (true) {
+		set_current_state(TASK_INTERRUPTIBLE);
+		data = atomic_xchg(&lis3->count, 0);
+		if (data)
+			break;
+
+		if (file->f_flags & O_NONBLOCK) {
+			retval = -EAGAIN;
+			goto out;
+		}
+
+		if (signal_pending(current)) {
+			retval = -ERESTARTSYS;
+			goto out;
+		}
+
+		schedule();
+	}
+
+	if (data < 255)
+		byte_data = data;
+	else
+		byte_data = 255;
+
+	/* make sure we are not going into copy_to_user() with
+	 * TASK_INTERRUPTIBLE state */
+	set_current_state(TASK_RUNNING);
+	if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
+		retval = -EFAULT;
+
+out:
+	__set_current_state(TASK_RUNNING);
+	remove_wait_queue(&lis3->misc_wait, &wait);
+
+	return retval;
+}
+
+static __poll_t lis3lv02d_misc_poll(struct file *file, poll_table *wait)
+{
+	struct lis3lv02d *lis3 = container_of(file->private_data,
+					      struct lis3lv02d, miscdev);
+
+	poll_wait(file, &lis3->misc_wait, wait);
+	if (atomic_read(&lis3->count))
+		return EPOLLIN | EPOLLRDNORM;
+	return 0;
+}
+
+static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
+{
+	struct lis3lv02d *lis3 = container_of(file->private_data,
+					      struct lis3lv02d, miscdev);
+
+	return fasync_helper(fd, file, on, &lis3->async_queue);
+}
+
+static const struct file_operations lis3lv02d_misc_fops = {
+	.owner   = THIS_MODULE,
+	.llseek  = no_llseek,
+	.read    = lis3lv02d_misc_read,
+	.open    = lis3lv02d_misc_open,
+	.release = lis3lv02d_misc_release,
+	.poll    = lis3lv02d_misc_poll,
+	.fasync  = lis3lv02d_misc_fasync,
+};
+
+int lis3lv02d_joystick_enable(struct lis3lv02d *lis3)
+{
+	struct input_dev *input_dev;
+	int err;
+	int max_val, fuzz, flat;
+	int btns[] = {BTN_X, BTN_Y, BTN_Z};
+
+	if (lis3->idev)
+		return -EINVAL;
+
+	input_dev = input_allocate_device();
+	if (!input_dev)
+		return -ENOMEM;
+
+	input_dev->name       = "ST LIS3LV02DL Accelerometer";
+	input_dev->phys       = DRIVER_NAME "/input0";
+	input_dev->id.bustype = BUS_HOST;
+	input_dev->id.vendor  = 0;
+	input_dev->dev.parent = &lis3->pdev->dev;
+
+	input_dev->open = lis3lv02d_joystick_open;
+	input_dev->close = lis3lv02d_joystick_close;
+
+	max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY;
+	if (lis3->whoami == WAI_12B) {
+		fuzz = LIS3_DEFAULT_FUZZ_12B;
+		flat = LIS3_DEFAULT_FLAT_12B;
+	} else {
+		fuzz = LIS3_DEFAULT_FUZZ_8B;
+		flat = LIS3_DEFAULT_FLAT_8B;
+	}
+	fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY;
+	flat = (flat * lis3->scale) / LIS3_ACCURACY;
+
+	input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
+	input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
+	input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
+
+	input_set_drvdata(input_dev, lis3);
+	lis3->idev = input_dev;
+
+	err = input_setup_polling(input_dev, lis3lv02d_joystick_poll);
+	if (err)
+		goto err_free_input;
+
+	input_set_poll_interval(input_dev, MDPS_POLL_INTERVAL);
+	input_set_min_poll_interval(input_dev, MDPS_POLL_MIN);
+	input_set_max_poll_interval(input_dev, MDPS_POLL_MAX);
+
+	lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns);
+	lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns);
+	lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns);
+
+	err = input_register_device(lis3->idev);
+	if (err)
+		goto err_free_input;
+
+	return 0;
+
+err_free_input:
+	input_free_device(input_dev);
+	lis3->idev = NULL;
+	return err;
+
+}
+EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
+
+void lis3lv02d_joystick_disable(struct lis3lv02d *lis3)
+{
+	if (lis3->irq)
+		free_irq(lis3->irq, lis3);
+	if (lis3->pdata && lis3->pdata->irq2)
+		free_irq(lis3->pdata->irq2, lis3);
+
+	if (!lis3->idev)
+		return;
+
+	if (lis3->irq)
+		misc_deregister(&lis3->miscdev);
+	input_unregister_device(lis3->idev);
+	lis3->idev = NULL;
+}
+EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
+
+/* Sysfs stuff */
+static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
+{
+	/*
+	 * SYSFS functions are fast visitors so put-call
+	 * immediately after the get-call. However, keep
+	 * chip running for a while and schedule delayed
+	 * suspend. This way periodic sysfs calls doesn't
+	 * suffer from relatively long power up time.
+	 */
+
+	if (lis3->pm_dev) {
+		pm_runtime_get_sync(lis3->pm_dev);
+		pm_runtime_put_noidle(lis3->pm_dev);
+		pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
+	}
+}
+
+static ssize_t lis3lv02d_selftest_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
+	s16 values[3];
+
+	static const char ok[] = "OK";
+	static const char fail[] = "FAIL";
+	static const char irq[] = "FAIL_IRQ";
+	const char *res;
+
+	lis3lv02d_sysfs_poweron(lis3);
+	switch (lis3lv02d_selftest(lis3, values)) {
+	case SELFTEST_FAIL:
+		res = fail;
+		break;
+	case SELFTEST_IRQ:
+		res = irq;
+		break;
+	case SELFTEST_OK:
+	default:
+		res = ok;
+		break;
+	}
+	return sprintf(buf, "%s %d %d %d\n", res,
+		values[0], values[1], values[2]);
+}
+
+static ssize_t lis3lv02d_position_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
+	int x, y, z;
+
+	lis3lv02d_sysfs_poweron(lis3);
+	mutex_lock(&lis3->mutex);
+	lis3lv02d_get_xyz(lis3, &x, &y, &z);
+	mutex_unlock(&lis3->mutex);
+	return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
+}
+
+static ssize_t lis3lv02d_rate_show(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
+	int odr_idx;
+
+	lis3lv02d_sysfs_poweron(lis3);
+
+	odr_idx = lis3lv02d_get_odr_index(lis3);
+	return sprintf(buf, "%d\n", lis3->odrs[odr_idx]);
+}
+
+static ssize_t lis3lv02d_rate_set(struct device *dev,
+				struct device_attribute *attr, const char *buf,
+				size_t count)
+{
+	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
+	unsigned long rate;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &rate);
+	if (ret)
+		return ret;
+
+	lis3lv02d_sysfs_poweron(lis3);
+	if (lis3lv02d_set_odr(lis3, rate))
+		return -EINVAL;
+
+	return count;
+}
+
+static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
+static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
+static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
+					    lis3lv02d_rate_set);
+
+static struct attribute *lis3lv02d_attributes[] = {
+	&dev_attr_selftest.attr,
+	&dev_attr_position.attr,
+	&dev_attr_rate.attr,
+	NULL
+};
+
+static const struct attribute_group lis3lv02d_attribute_group = {
+	.attrs = lis3lv02d_attributes
+};
+
+
+static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
+{
+	lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
+	if (IS_ERR(lis3->pdev))
+		return PTR_ERR(lis3->pdev);
+
+	platform_set_drvdata(lis3->pdev, lis3);
+	return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
+}
+
+void lis3lv02d_remove_fs(struct lis3lv02d *lis3)
+{
+	sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
+	platform_device_unregister(lis3->pdev);
+	if (lis3->pm_dev) {
+		/* Barrier after the sysfs remove */
+		pm_runtime_barrier(lis3->pm_dev);
+
+		/* SYSFS may have left chip running. Turn off if necessary */
+		if (!pm_runtime_suspended(lis3->pm_dev))
+			lis3lv02d_poweroff(lis3);
+
+		pm_runtime_disable(lis3->pm_dev);
+		pm_runtime_set_suspended(lis3->pm_dev);
+	}
+	kfree(lis3->reg_cache);
+}
+EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
+
+static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
+				struct lis3lv02d_platform_data *p)
+{
+	int err;
+	int ctrl2 = p->hipass_ctrl;
+
+	if (p->click_flags) {
+		lis3->write(lis3, CLICK_CFG, p->click_flags);
+		lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);
+		lis3->write(lis3, CLICK_LATENCY, p->click_latency);
+		lis3->write(lis3, CLICK_WINDOW, p->click_window);
+		lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);
+		lis3->write(lis3, CLICK_THSY_X,
+			(p->click_thresh_x & 0xf) |
+			(p->click_thresh_y << 4));
+
+		if (lis3->idev) {
+			input_set_capability(lis3->idev, EV_KEY, BTN_X);
+			input_set_capability(lis3->idev, EV_KEY, BTN_Y);
+			input_set_capability(lis3->idev, EV_KEY, BTN_Z);
+		}
+	}
+
+	if (p->wakeup_flags) {
+		lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);
+		lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
+		/* pdata value + 1 to keep this backward compatible*/
+		lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);
+		ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
+	}
+
+	if (p->wakeup_flags2) {
+		lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);
+		lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
+		/* pdata value + 1 to keep this backward compatible*/
+		lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);
+		ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
+	}
+	/* Configure hipass filters */
+	lis3->write(lis3, CTRL_REG2, ctrl2);
+
+	if (p->irq2) {
+		err = request_threaded_irq(p->irq2,
+					NULL,
+					lis302dl_interrupt_thread2_8b,
+					IRQF_TRIGGER_RISING | IRQF_ONESHOT |
+					(p->irq_flags2 & IRQF_TRIGGER_MASK),
+					DRIVER_NAME, lis3);
+		if (err < 0)
+			pr_err("No second IRQ. Limited functionality\n");
+	}
+}
+
+#ifdef CONFIG_OF
+int lis3lv02d_init_dt(struct lis3lv02d *lis3)
+{
+	struct lis3lv02d_platform_data *pdata;
+	struct device_node *np = lis3->of_node;
+	u32 val;
+	s32 sval;
+
+	if (!lis3->of_node)
+		return 0;
+
+	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	if (of_get_property(np, "st,click-single-x", NULL))
+		pdata->click_flags |= LIS3_CLICK_SINGLE_X;
+	if (of_get_property(np, "st,click-double-x", NULL))
+		pdata->click_flags |= LIS3_CLICK_DOUBLE_X;
+
+	if (of_get_property(np, "st,click-single-y", NULL))
+		pdata->click_flags |= LIS3_CLICK_SINGLE_Y;
+	if (of_get_property(np, "st,click-double-y", NULL))
+		pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;
+
+	if (of_get_property(np, "st,click-single-z", NULL))
+		pdata->click_flags |= LIS3_CLICK_SINGLE_Z;
+	if (of_get_property(np, "st,click-double-z", NULL))
+		pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;
+
+	if (!of_property_read_u32(np, "st,click-threshold-x", &val))
+		pdata->click_thresh_x = val;
+	if (!of_property_read_u32(np, "st,click-threshold-y", &val))
+		pdata->click_thresh_y = val;
+	if (!of_property_read_u32(np, "st,click-threshold-z", &val))
+		pdata->click_thresh_z = val;
+
+	if (!of_property_read_u32(np, "st,click-time-limit", &val))
+		pdata->click_time_limit = val;
+	if (!of_property_read_u32(np, "st,click-latency", &val))
+		pdata->click_latency = val;
+	if (!of_property_read_u32(np, "st,click-window", &val))
+		pdata->click_window = val;
+
+	if (of_get_property(np, "st,irq1-disable", NULL))
+		pdata->irq_cfg |= LIS3_IRQ1_DISABLE;
+	if (of_get_property(np, "st,irq1-ff-wu-1", NULL))
+		pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;
+	if (of_get_property(np, "st,irq1-ff-wu-2", NULL))
+		pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;
+	if (of_get_property(np, "st,irq1-data-ready", NULL))
+		pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;
+	if (of_get_property(np, "st,irq1-click", NULL))
+		pdata->irq_cfg |= LIS3_IRQ1_CLICK;
+
+	if (of_get_property(np, "st,irq2-disable", NULL))
+		pdata->irq_cfg |= LIS3_IRQ2_DISABLE;
+	if (of_get_property(np, "st,irq2-ff-wu-1", NULL))
+		pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;
+	if (of_get_property(np, "st,irq2-ff-wu-2", NULL))
+		pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;
+	if (of_get_property(np, "st,irq2-data-ready", NULL))
+		pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;
+	if (of_get_property(np, "st,irq2-click", NULL))
+		pdata->irq_cfg |= LIS3_IRQ2_CLICK;
+
+	if (of_get_property(np, "st,irq-open-drain", NULL))
+		pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;
+	if (of_get_property(np, "st,irq-active-low", NULL))
+		pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;
+
+	if (!of_property_read_u32(np, "st,wu-duration-1", &val))
+		pdata->duration1 = val;
+	if (!of_property_read_u32(np, "st,wu-duration-2", &val))
+		pdata->duration2 = val;
+
+	if (of_get_property(np, "st,wakeup-x-lo", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;
+	if (of_get_property(np, "st,wakeup-x-hi", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;
+	if (of_get_property(np, "st,wakeup-y-lo", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;
+	if (of_get_property(np, "st,wakeup-y-hi", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;
+	if (of_get_property(np, "st,wakeup-z-lo", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
+	if (of_get_property(np, "st,wakeup-z-hi", NULL))
+		pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
+	if (of_get_property(np, "st,wakeup-threshold", &val))
+		pdata->wakeup_thresh = val;
+
+	if (of_get_property(np, "st,wakeup2-x-lo", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_X_LO;
+	if (of_get_property(np, "st,wakeup2-x-hi", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_X_HI;
+	if (of_get_property(np, "st,wakeup2-y-lo", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_LO;
+	if (of_get_property(np, "st,wakeup2-y-hi", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_HI;
+	if (of_get_property(np, "st,wakeup2-z-lo", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_LO;
+	if (of_get_property(np, "st,wakeup2-z-hi", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_HI;
+	if (of_get_property(np, "st,wakeup2-threshold", &val))
+		pdata->wakeup_thresh2 = val;
+
+	if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {
+		switch (val) {
+		case 1:
+			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;
+			break;
+		case 2:
+			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;
+			break;
+		case 4:
+			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;
+			break;
+		case 8:
+			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;
+			break;
+		}
+	}
+
+	if (of_get_property(np, "st,hipass1-disable", NULL))
+		pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;
+	if (of_get_property(np, "st,hipass2-disable", NULL))
+		pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;
+
+	if (of_property_read_s32(np, "st,axis-x", &sval) == 0)
+		pdata->axis_x = sval;
+	if (of_property_read_s32(np, "st,axis-y", &sval) == 0)
+		pdata->axis_y = sval;
+	if (of_property_read_s32(np, "st,axis-z", &sval) == 0)
+		pdata->axis_z = sval;
+
+	if (of_get_property(np, "st,default-rate", NULL))
+		pdata->default_rate = val;
+
+	if (of_property_read_s32(np, "st,min-limit-x", &sval) == 0)
+		pdata->st_min_limits[0] = sval;
+	if (of_property_read_s32(np, "st,min-limit-y", &sval) == 0)
+		pdata->st_min_limits[1] = sval;
+	if (of_property_read_s32(np, "st,min-limit-z", &sval) == 0)
+		pdata->st_min_limits[2] = sval;
+
+	if (of_property_read_s32(np, "st,max-limit-x", &sval) == 0)
+		pdata->st_max_limits[0] = sval;
+	if (of_property_read_s32(np, "st,max-limit-y", &sval) == 0)
+		pdata->st_max_limits[1] = sval;
+	if (of_property_read_s32(np, "st,max-limit-z", &sval) == 0)
+		pdata->st_max_limits[2] = sval;
+
+
+	lis3->pdata = pdata;
+
+	return 0;
+}
+
+#else
+int lis3lv02d_init_dt(struct lis3lv02d *lis3)
+{
+	return 0;
+}
+#endif
+EXPORT_SYMBOL_GPL(lis3lv02d_init_dt);
+
+/*
+ * Initialise the accelerometer and the various subsystems.
+ * Should be rather independent of the bus system.
+ */
+int lis3lv02d_init_device(struct lis3lv02d *lis3)
+{
+	int err;
+	irq_handler_t thread_fn;
+	int irq_flags = 0;
+
+	lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
+
+	switch (lis3->whoami) {
+	case WAI_12B:
+		pr_info("12 bits sensor found\n");
+		lis3->read_data = lis3lv02d_read_12;
+		lis3->mdps_max_val = 2048;
+		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
+		lis3->odrs = lis3_12_rates;
+		lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;
+		lis3->scale = LIS3_SENSITIVITY_12B;
+		lis3->regs = lis3_wai12_regs;
+		lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);
+		break;
+	case WAI_8B:
+		pr_info("8 bits sensor found\n");
+		lis3->read_data = lis3lv02d_read_8;
+		lis3->mdps_max_val = 128;
+		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
+		lis3->odrs = lis3_8_rates;
+		lis3->odr_mask = CTRL1_DR;
+		lis3->scale = LIS3_SENSITIVITY_8B;
+		lis3->regs = lis3_wai8_regs;
+		lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);
+		break;
+	case WAI_3DC:
+		pr_info("8 bits 3DC sensor found\n");
+		lis3->read_data = lis3lv02d_read_8;
+		lis3->mdps_max_val = 128;
+		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
+		lis3->odrs = lis3_3dc_rates;
+		lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
+		lis3->scale = LIS3_SENSITIVITY_8B;
+		break;
+	case WAI_3DLH:
+		pr_info("16 bits lis331dlh sensor found\n");
+		lis3->read_data = lis331dlh_read_data;
+		lis3->mdps_max_val = 2048; /* 12 bits for 2G */
+		lis3->shift_adj = SHIFT_ADJ_2G;
+		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
+		lis3->odrs = lis3_3dlh_rates;
+		lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1;
+		lis3->scale = LIS3DLH_SENSITIVITY_2G;
+		break;
+	default:
+		pr_err("unknown sensor type 0x%X\n", lis3->whoami);
+		return -ENODEV;
+	}
+
+	lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
+				     sizeof(lis3_wai12_regs)), GFP_KERNEL);
+
+	if (lis3->reg_cache == NULL)
+		return -ENOMEM;
+
+	mutex_init(&lis3->mutex);
+	atomic_set(&lis3->wake_thread, 0);
+
+	lis3lv02d_add_fs(lis3);
+	err = lis3lv02d_poweron(lis3);
+	if (err) {
+		lis3lv02d_remove_fs(lis3);
+		return err;
+	}
+
+	if (lis3->pm_dev) {
+		pm_runtime_set_active(lis3->pm_dev);
+		pm_runtime_enable(lis3->pm_dev);
+	}
+
+	if (lis3lv02d_joystick_enable(lis3))
+		pr_err("joystick initialization failed\n");
+
+	/* passing in platform specific data is purely optional and only
+	 * used by the SPI transport layer at the moment */
+	if (lis3->pdata) {
+		struct lis3lv02d_platform_data *p = lis3->pdata;
+
+		if (lis3->whoami == WAI_8B)
+			lis3lv02d_8b_configure(lis3, p);
+
+		irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
+
+		lis3->irq_cfg = p->irq_cfg;
+		if (p->irq_cfg)
+			lis3->write(lis3, CTRL_REG3, p->irq_cfg);
+
+		if (p->default_rate)
+			lis3lv02d_set_odr(lis3, p->default_rate);
+	}
+
+	/* bail if we did not get an IRQ from the bus layer */
+	if (!lis3->irq) {
+		pr_debug("No IRQ. Disabling /dev/freefall\n");
+		goto out;
+	}
+
+	/*
+	 * The sensor can generate interrupts for free-fall and direction
+	 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
+	 * the things simple and _fast_ we activate it only for free-fall, so
+	 * no need to read register (very slow with ACPI). For the same reason,
+	 * we forbid shared interrupts.
+	 *
+	 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
+	 * io-apic is not configurable (and generates a warning) but I keep it
+	 * in case of support for other hardware.
+	 */
+	if (lis3->pdata && lis3->whoami == WAI_8B)
+		thread_fn = lis302dl_interrupt_thread1_8b;
+	else
+		thread_fn = NULL;
+
+	err = request_threaded_irq(lis3->irq, lis302dl_interrupt,
+				thread_fn,
+				IRQF_TRIGGER_RISING | IRQF_ONESHOT |
+				irq_flags,
+				DRIVER_NAME, lis3);
+
+	if (err < 0) {
+		pr_err("Cannot get IRQ\n");
+		goto out;
+	}
+
+	lis3->miscdev.minor	= MISC_DYNAMIC_MINOR;
+	lis3->miscdev.name	= "freefall";
+	lis3->miscdev.fops	= &lis3lv02d_misc_fops;
+
+	if (misc_register(&lis3->miscdev))
+		pr_err("misc_register failed\n");
+out:
+	return 0;
+}
+EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
+
+MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
+MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
+MODULE_LICENSE("GPL");