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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/misc/lis3lv02d/lis3lv02d.c
Initial import
Diffstat (limited to 'drivers/misc/lis3lv02d/lis3lv02d.c')
-rw-r--r--drivers/misc/lis3lv02d/lis3lv02d.c1262
1 files changed, 1262 insertions, 0 deletions
diff --git a/drivers/misc/lis3lv02d/lis3lv02d.c b/drivers/misc/lis3lv02d/lis3lv02d.c
new file mode 100644
index 000000000..4739689d2
--- /dev/null
+++ b/drivers/misc/lis3lv02d/lis3lv02d.c
@@ -0,0 +1,1262 @@
+/*
+ * lis3lv02d.c - ST LIS3LV02DL accelerometer driver
+ *
+ * Copyright (C) 2007-2008 Yan Burman
+ * Copyright (C) 2008 Eric Piel
+ * Copyright (C) 2008-2009 Pavel Machek
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.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-polldev.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 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(struct lis3lv02d *lis3)
+{
+ u8 ctrl;
+ int shift;
+
+ lis3->read(lis3, CTRL_REG1, &ctrl);
+ ctrl &= lis3->odr_mask;
+ shift = ffs(lis3->odr_mask) - 1;
+ return lis3->odrs[(ctrl >> shift)];
+}
+
+static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
+{
+ int div = lis3lv02d_get_odr(lis3);
+
+ if (WARN_ONCE(div == 0, "device returned spurious data"))
+ 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_polled_dev *pidev)
+{
+ struct lis3lv02d *lis3 = pidev->private;
+ int x, y, z;
+
+ mutex_lock(&lis3->mutex);
+ lis3lv02d_get_xyz(lis3, &x, &y, &z);
+ input_report_abs(pidev->input, ABS_X, x);
+ input_report_abs(pidev->input, ABS_Y, y);
+ input_report_abs(pidev->input, ABS_Z, z);
+ input_sync(pidev->input);
+ mutex_unlock(&lis3->mutex);
+}
+
+static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
+{
+ struct lis3lv02d *lis3 = pidev->private;
+
+ 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(pidev);
+}
+
+static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
+{
+ struct lis3lv02d *lis3 = pidev->private;
+
+ 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->input;
+ 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 unsigned int 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 POLLIN | POLLRDNORM;
+ 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;
+
+ lis3->idev = input_allocate_polled_device();
+ if (!lis3->idev)
+ return -ENOMEM;
+
+ lis3->idev->poll = lis3lv02d_joystick_poll;
+ lis3->idev->open = lis3lv02d_joystick_open;
+ lis3->idev->close = lis3lv02d_joystick_close;
+ lis3->idev->poll_interval = MDPS_POLL_INTERVAL;
+ lis3->idev->poll_interval_min = MDPS_POLL_MIN;
+ lis3->idev->poll_interval_max = MDPS_POLL_MAX;
+ lis3->idev->private = lis3;
+ input_dev = lis3->idev->input;
+
+ 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;
+
+ set_bit(EV_ABS, input_dev->evbit);
+ 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);
+
+ 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_polled_device(lis3->idev);
+ if (err) {
+ input_free_polled_device(lis3->idev);
+ 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_polled_device(lis3->idev);
+ input_free_polled_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);
+
+ lis3lv02d_sysfs_poweron(lis3);
+ return sprintf(buf, "%d\n", lis3lv02d_get_odr(lis3));
+}
+
+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 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);
+}
+
+int 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);
+ return 0;
+}
+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) {
+ struct input_dev *input_dev = lis3->idev->input;
+ input_set_capability(input_dev, EV_KEY, BTN_X);
+ input_set_capability(input_dev, EV_KEY, BTN_Y);
+ input_set_capability(input_dev, 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 -EINVAL;
+ }
+
+ lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
+ sizeof(lis3_wai12_regs)), GFP_KERNEL);
+
+ if (lis3->reg_cache == NULL) {
+ printk(KERN_ERR DRIVER_NAME "out of memory\n");
+ 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");