Linux-2.6.33.2/drivers/hwmon/lis3lv02d.c
/*
* 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
*/
#include <linux/kernel.h>
#include <linux/init.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/freezer.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <asm/atomic.h>
#include "lis3lv02d.h"
#define DRIVER_NAME "lis3lv02d"
/* joystick device poll interval in milliseconds */
#define MDPS_POLL_INTERVAL 50
/*
* 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)
#define LIS3_DEFAULT_FUZZ 3
#define LIS3_DEFAULT_FLAT 3
struct lis3lv02d lis3_dev = {
.misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
};
EXPORT_SYMBOL_GPL(lis3_dev);
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);
}
/**
* 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;
mutex_lock(&lis3->mutex);
position[0] = lis3->read_data(lis3, OUTX);
position[1] = lis3->read_data(lis3, OUTY);
position[2] = lis3->read_data(lis3, OUTZ);
mutex_unlock(&lis3->mutex);
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};
/* ODR is Output Data Rate */
static int lis3lv02d_get_odr(void)
{
u8 ctrl;
int shift;
lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
ctrl &= lis3_dev.odr_mask;
shift = ffs(lis3_dev.odr_mask) - 1;
return lis3_dev.odrs[(ctrl >> shift)];
}
static int lis3lv02d_set_odr(int rate)
{
u8 ctrl;
int i, len, shift;
lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
ctrl &= ~lis3_dev.odr_mask;
len = 1 << hweight_long(lis3_dev.odr_mask); /* # of possible values */
shift = ffs(lis3_dev.odr_mask) - 1;
for (i = 0; i < len; i++)
if (lis3_dev.odrs[i] == rate) {
lis3_dev.write(&lis3_dev, CTRL_REG1,
ctrl | (i << shift));
return 0;
}
return -EINVAL;
}
static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
{
u8 reg;
s16 x, y, z;
u8 selftest;
int ret;
mutex_lock(&lis3->mutex);
if (lis3_dev.whoami == WAI_12B)
selftest = CTRL1_ST;
else
selftest = CTRL1_STP;
lis3->read(lis3, CTRL_REG1, ®);
lis3->write(lis3, CTRL_REG1, (reg | selftest));
msleep(lis3->pwron_delay / lis3lv02d_get_odr());
/* 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, CTRL_REG1, reg);
msleep(lis3->pwron_delay / lis3lv02d_get_odr());
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->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 = -EIO;
goto fail;
}
}
}
/* test passed */
fail:
mutex_unlock(&lis3->mutex);
return ret;
}
void lis3lv02d_poweroff(struct lis3lv02d *lis3)
{
/* disable X,Y,Z axis and power down */
lis3->write(lis3, CTRL_REG1, 0x00);
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
void lis3lv02d_poweron(struct lis3lv02d *lis3)
{
u8 reg;
lis3->init(lis3);
/* LIS3 power on delay is quite long */
msleep(lis3->pwron_delay / lis3lv02d_get_odr());
/*
* 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.
*/
if (lis3->whoami == WAI_12B) {
lis3->read(lis3, CTRL_REG2, ®);
reg |= CTRL2_BDU;
lis3->write(lis3, CTRL_REG2, reg);
}
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
{
/*
* 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_dev.count);
wake_up_interruptible(&lis3_dev.misc_wait);
kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
return IRQ_HANDLED;
}
static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
{
int ret;
if (test_and_set_bit(0, &lis3_dev.misc_opened))
return -EBUSY; /* already open */
atomic_set(&lis3_dev.count, 0);
/*
* 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.
*/
ret = request_irq(lis3_dev.irq, lis302dl_interrupt, IRQF_TRIGGER_RISING,
DRIVER_NAME, &lis3_dev);
if (ret) {
clear_bit(0, &lis3_dev.misc_opened);
printk(KERN_ERR DRIVER_NAME ": IRQ%d allocation failed\n", lis3_dev.irq);
return -EBUSY;
}
return 0;
}
static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
{
fasync_helper(-1, file, 0, &lis3_dev.async_queue);
free_irq(lis3_dev.irq, &lis3_dev);
clear_bit(0, &lis3_dev.misc_opened); /* release the device */
return 0;
}
static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
size_t count, loff_t *pos)
{
DECLARE_WAITQUEUE(wait, current);
u32 data;
unsigned char byte_data;
ssize_t retval = 1;
if (count < 1)
return -EINVAL;
add_wait_queue(&lis3_dev.misc_wait, &wait);
while (true) {
set_current_state(TASK_INTERRUPTIBLE);
data = atomic_xchg(&lis3_dev.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_dev.misc_wait, &wait);
return retval;
}
static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
{
poll_wait(file, &lis3_dev.misc_wait, wait);
if (atomic_read(&lis3_dev.count))
return POLLIN | POLLRDNORM;
return 0;
}
static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
{
return fasync_helper(fd, file, on, &lis3_dev.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,
};
static struct miscdevice lis3lv02d_misc_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = "freefall",
.fops = &lis3lv02d_misc_fops,
};
static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
{
int x, y, z;
lis3lv02d_get_xyz(&lis3_dev, &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);
}
int lis3lv02d_joystick_enable(void)
{
struct input_dev *input_dev;
int err;
int max_val, fuzz, flat;
if (lis3_dev.idev)
return -EINVAL;
lis3_dev.idev = input_allocate_polled_device();
if (!lis3_dev.idev)
return -ENOMEM;
lis3_dev.idev->poll = lis3lv02d_joystick_poll;
lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
input_dev = lis3_dev.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_dev.pdev->dev;
set_bit(EV_ABS, input_dev->evbit);
max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
fuzz = (LIS3_DEFAULT_FUZZ * lis3_dev.scale) / LIS3_ACCURACY;
flat = (LIS3_DEFAULT_FLAT * lis3_dev.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);
err = input_register_polled_device(lis3_dev.idev);
if (err) {
input_free_polled_device(lis3_dev.idev);
lis3_dev.idev = NULL;
}
return err;
}
EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
void lis3lv02d_joystick_disable(void)
{
if (!lis3_dev.idev)
return;
if (lis3_dev.irq)
misc_deregister(&lis3lv02d_misc_device);
input_unregister_polled_device(lis3_dev.idev);
input_free_polled_device(lis3_dev.idev);
lis3_dev.idev = NULL;
}
EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
/* Sysfs stuff */
static ssize_t lis3lv02d_selftest_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int result;
s16 values[3];
result = lis3lv02d_selftest(&lis3_dev, values);
return sprintf(buf, "%s %d %d %d\n", result == 0 ? "OK" : "FAIL",
values[0], values[1], values[2]);
}
static ssize_t lis3lv02d_position_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int x, y, z;
lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
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)
{
return sprintf(buf, "%d\n", lis3lv02d_get_odr());
}
static ssize_t lis3lv02d_rate_set(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
unsigned long rate;
if (strict_strtoul(buf, 0, &rate))
return -EINVAL;
if (lis3lv02d_set_odr(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);
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);
return 0;
}
EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
/*
* Initialise the accelerometer and the various subsystems.
* Should be rather independent of the bus system.
*/
int lis3lv02d_init_device(struct lis3lv02d *dev)
{
dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
switch (dev->whoami) {
case WAI_12B:
printk(KERN_INFO DRIVER_NAME ": 12 bits sensor found\n");
dev->read_data = lis3lv02d_read_12;
dev->mdps_max_val = 2048;
dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
dev->odrs = lis3_12_rates;
dev->odr_mask = CTRL1_DF0 | CTRL1_DF1;
dev->scale = LIS3_SENSITIVITY_12B;
break;
case WAI_8B:
printk(KERN_INFO DRIVER_NAME ": 8 bits sensor found\n");
dev->read_data = lis3lv02d_read_8;
dev->mdps_max_val = 128;
dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
dev->odrs = lis3_8_rates;
dev->odr_mask = CTRL1_DR;
dev->scale = LIS3_SENSITIVITY_8B;
break;
default:
printk(KERN_ERR DRIVER_NAME
": unknown sensor type 0x%X\n", dev->whoami);
return -EINVAL;
}
mutex_init(&dev->mutex);
lis3lv02d_add_fs(dev);
lis3lv02d_poweron(dev);
if (lis3lv02d_joystick_enable())
printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
/* passing in platform specific data is purely optional and only
* used by the SPI transport layer at the moment */
if (dev->pdata) {
struct lis3lv02d_platform_data *p = dev->pdata;
if (p->click_flags && (dev->whoami == WAI_8B)) {
dev->write(dev, CLICK_CFG, p->click_flags);
dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
dev->write(dev, CLICK_LATENCY, p->click_latency);
dev->write(dev, CLICK_WINDOW, p->click_window);
dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
dev->write(dev, CLICK_THSY_X,
(p->click_thresh_x & 0xf) |
(p->click_thresh_y << 4));
}
if (p->wakeup_flags && (dev->whoami == WAI_8B)) {
dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
/* default to 2.5ms for now */
dev->write(dev, FF_WU_DURATION_1, 1);
/* enable high pass filter for both free-fall units */
dev->write(dev, CTRL_REG2, HP_FF_WU1 | HP_FF_WU2);
}
if (p->irq_cfg)
dev->write(dev, CTRL_REG3, p->irq_cfg);
}
/* bail if we did not get an IRQ from the bus layer */
if (!dev->irq) {
printk(KERN_ERR DRIVER_NAME
": No IRQ. Disabling /dev/freefall\n");
goto out;
}
if (misc_register(&lis3lv02d_misc_device))
printk(KERN_ERR DRIVER_NAME ": 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");