488 lines
13 KiB
C
488 lines
13 KiB
C
/*
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* lis3lv02d.c - ST LIS3LV02DL accelerometer driver
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*
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* Copyright (C) 2007-2008 Yan Burman
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* Copyright (C) 2008 Eric Piel
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* Copyright (C) 2008-2009 Pavel Machek
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/dmi.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/input-polldev.h>
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#include <linux/delay.h>
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#include <linux/wait.h>
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#include <linux/poll.h>
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#include <linux/freezer.h>
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#include <linux/uaccess.h>
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#include <linux/miscdevice.h>
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#include <asm/atomic.h>
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#include "lis3lv02d.h"
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#define DRIVER_NAME "lis3lv02d"
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/* joystick device poll interval in milliseconds */
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#define MDPS_POLL_INTERVAL 50
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/*
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* The sensor can also generate interrupts (DRDY) but it's pretty pointless
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* because their are generated even if the data do not change. So it's better
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* to keep the interrupt for the free-fall event. The values are updated at
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* 40Hz (at the lowest frequency), but as it can be pretty time consuming on
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* some low processor, we poll the sensor only at 20Hz... enough for the
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* joystick.
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*/
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struct lis3lv02d lis3_dev = {
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.misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
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};
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EXPORT_SYMBOL_GPL(lis3_dev);
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static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
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{
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s8 lo;
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if (lis3->read(lis3, reg, &lo) < 0)
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return 0;
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return lo;
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}
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static s16 lis3lv02d_read_16(struct lis3lv02d *lis3, int reg)
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{
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u8 lo, hi;
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lis3->read(lis3, reg - 1, &lo);
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lis3->read(lis3, reg, &hi);
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/* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
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return (s16)((hi << 8) | lo);
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}
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/**
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* lis3lv02d_get_axis - For the given axis, give the value converted
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* @axis: 1,2,3 - can also be negative
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* @hw_values: raw values returned by the hardware
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*
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* Returns the converted value.
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*/
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static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
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{
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if (axis > 0)
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return hw_values[axis - 1];
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else
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return -hw_values[-axis - 1];
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}
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/**
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* lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
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* @lis3: pointer to the device struct
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* @x: where to store the X axis value
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* @y: where to store the Y axis value
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* @z: where to store the Z axis value
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*
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* Note that 40Hz input device can eat up about 10% CPU at 800MHZ
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*/
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static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
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{
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int position[3];
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position[0] = lis3->read_data(lis3, OUTX);
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position[1] = lis3->read_data(lis3, OUTY);
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position[2] = lis3->read_data(lis3, OUTZ);
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*x = lis3lv02d_get_axis(lis3->ac.x, position);
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*y = lis3lv02d_get_axis(lis3->ac.y, position);
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*z = lis3lv02d_get_axis(lis3->ac.z, position);
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}
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void lis3lv02d_poweroff(struct lis3lv02d *lis3)
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{
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/* disable X,Y,Z axis and power down */
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lis3->write(lis3, CTRL_REG1, 0x00);
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
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void lis3lv02d_poweron(struct lis3lv02d *lis3)
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{
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u8 reg;
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lis3->init(lis3);
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/*
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* Common configuration
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* BDU: LSB and MSB values are not updated until both have been read.
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* So the value read will always be correct.
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*/
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lis3->read(lis3, CTRL_REG2, ®);
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reg |= CTRL2_BDU;
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lis3->write(lis3, CTRL_REG2, reg);
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
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static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
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{
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/*
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* Be careful: on some HP laptops the bios force DD when on battery and
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* the lid is closed. This leads to interrupts as soon as a little move
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* is done.
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*/
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atomic_inc(&lis3_dev.count);
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wake_up_interruptible(&lis3_dev.misc_wait);
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kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
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return IRQ_HANDLED;
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}
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static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
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{
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int ret;
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if (test_and_set_bit(0, &lis3_dev.misc_opened))
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return -EBUSY; /* already open */
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atomic_set(&lis3_dev.count, 0);
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/*
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* The sensor can generate interrupts for free-fall and direction
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* detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
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* the things simple and _fast_ we activate it only for free-fall, so
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* no need to read register (very slow with ACPI). For the same reason,
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* we forbid shared interrupts.
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*
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* IRQF_TRIGGER_RISING seems pointless on HP laptops because the
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* io-apic is not configurable (and generates a warning) but I keep it
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* in case of support for other hardware.
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*/
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ret = request_irq(lis3_dev.irq, lis302dl_interrupt, IRQF_TRIGGER_RISING,
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DRIVER_NAME, &lis3_dev);
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if (ret) {
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clear_bit(0, &lis3_dev.misc_opened);
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printk(KERN_ERR DRIVER_NAME ": IRQ%d allocation failed\n", lis3_dev.irq);
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return -EBUSY;
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}
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return 0;
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}
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static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
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{
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fasync_helper(-1, file, 0, &lis3_dev.async_queue);
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free_irq(lis3_dev.irq, &lis3_dev);
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clear_bit(0, &lis3_dev.misc_opened); /* release the device */
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return 0;
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}
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static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
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size_t count, loff_t *pos)
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{
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DECLARE_WAITQUEUE(wait, current);
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u32 data;
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unsigned char byte_data;
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ssize_t retval = 1;
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if (count < 1)
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return -EINVAL;
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add_wait_queue(&lis3_dev.misc_wait, &wait);
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while (true) {
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set_current_state(TASK_INTERRUPTIBLE);
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data = atomic_xchg(&lis3_dev.count, 0);
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if (data)
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break;
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if (file->f_flags & O_NONBLOCK) {
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retval = -EAGAIN;
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goto out;
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}
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if (signal_pending(current)) {
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retval = -ERESTARTSYS;
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goto out;
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}
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schedule();
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}
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if (data < 255)
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byte_data = data;
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else
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byte_data = 255;
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/* make sure we are not going into copy_to_user() with
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* TASK_INTERRUPTIBLE state */
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set_current_state(TASK_RUNNING);
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if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
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retval = -EFAULT;
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out:
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&lis3_dev.misc_wait, &wait);
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return retval;
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}
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static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
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{
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poll_wait(file, &lis3_dev.misc_wait, wait);
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if (atomic_read(&lis3_dev.count))
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return POLLIN | POLLRDNORM;
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return 0;
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}
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static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
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{
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return fasync_helper(fd, file, on, &lis3_dev.async_queue);
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}
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static const struct file_operations lis3lv02d_misc_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.read = lis3lv02d_misc_read,
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.open = lis3lv02d_misc_open,
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.release = lis3lv02d_misc_release,
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.poll = lis3lv02d_misc_poll,
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.fasync = lis3lv02d_misc_fasync,
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};
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static struct miscdevice lis3lv02d_misc_device = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "freefall",
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.fops = &lis3lv02d_misc_fops,
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};
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static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
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{
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int x, y, z;
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lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
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input_report_abs(pidev->input, ABS_X, x - lis3_dev.xcalib);
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input_report_abs(pidev->input, ABS_Y, y - lis3_dev.ycalib);
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input_report_abs(pidev->input, ABS_Z, z - lis3_dev.zcalib);
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}
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static inline void lis3lv02d_calibrate_joystick(void)
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{
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lis3lv02d_get_xyz(&lis3_dev,
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&lis3_dev.xcalib, &lis3_dev.ycalib, &lis3_dev.zcalib);
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}
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int lis3lv02d_joystick_enable(void)
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{
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struct input_dev *input_dev;
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int err;
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if (lis3_dev.idev)
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return -EINVAL;
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lis3_dev.idev = input_allocate_polled_device();
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if (!lis3_dev.idev)
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return -ENOMEM;
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lis3_dev.idev->poll = lis3lv02d_joystick_poll;
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lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
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input_dev = lis3_dev.idev->input;
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lis3lv02d_calibrate_joystick();
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input_dev->name = "ST LIS3LV02DL Accelerometer";
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input_dev->phys = DRIVER_NAME "/input0";
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input_dev->id.bustype = BUS_HOST;
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input_dev->id.vendor = 0;
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input_dev->dev.parent = &lis3_dev.pdev->dev;
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set_bit(EV_ABS, input_dev->evbit);
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input_set_abs_params(input_dev, ABS_X, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3);
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input_set_abs_params(input_dev, ABS_Y, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3);
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input_set_abs_params(input_dev, ABS_Z, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3);
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err = input_register_polled_device(lis3_dev.idev);
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if (err) {
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input_free_polled_device(lis3_dev.idev);
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lis3_dev.idev = NULL;
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
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void lis3lv02d_joystick_disable(void)
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{
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if (!lis3_dev.idev)
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return;
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if (lis3_dev.irq)
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misc_deregister(&lis3lv02d_misc_device);
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input_unregister_polled_device(lis3_dev.idev);
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lis3_dev.idev = NULL;
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
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/* Sysfs stuff */
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static ssize_t lis3lv02d_position_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int x, y, z;
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lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
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return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
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}
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static ssize_t lis3lv02d_calibrate_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "(%d,%d,%d)\n", lis3_dev.xcalib, lis3_dev.ycalib, lis3_dev.zcalib);
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}
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static ssize_t lis3lv02d_calibrate_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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lis3lv02d_calibrate_joystick();
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return count;
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}
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/* conversion btw sampling rate and the register values */
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static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560};
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static ssize_t lis3lv02d_rate_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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u8 ctrl;
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int val;
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lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
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val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4;
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return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]);
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}
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static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
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static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show,
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lis3lv02d_calibrate_store);
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static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL);
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static struct attribute *lis3lv02d_attributes[] = {
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&dev_attr_position.attr,
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&dev_attr_calibrate.attr,
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&dev_attr_rate.attr,
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NULL
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};
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static struct attribute_group lis3lv02d_attribute_group = {
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.attrs = lis3lv02d_attributes
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};
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static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
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{
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lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
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if (IS_ERR(lis3->pdev))
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return PTR_ERR(lis3->pdev);
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return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
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}
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int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
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{
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sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
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platform_device_unregister(lis3->pdev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
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/*
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* Initialise the accelerometer and the various subsystems.
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* Should be rather independant of the bus system.
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*/
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int lis3lv02d_init_device(struct lis3lv02d *dev)
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{
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dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
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switch (dev->whoami) {
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case LIS_DOUBLE_ID:
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printk(KERN_INFO DRIVER_NAME ": 2-byte sensor found\n");
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dev->read_data = lis3lv02d_read_16;
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dev->mdps_max_val = 2048;
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break;
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case LIS_SINGLE_ID:
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printk(KERN_INFO DRIVER_NAME ": 1-byte sensor found\n");
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dev->read_data = lis3lv02d_read_8;
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dev->mdps_max_val = 128;
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break;
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default:
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printk(KERN_ERR DRIVER_NAME
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": unknown sensor type 0x%X\n", dev->whoami);
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return -EINVAL;
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}
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lis3lv02d_add_fs(dev);
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lis3lv02d_poweron(dev);
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if (lis3lv02d_joystick_enable())
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printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
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/* passing in platform specific data is purely optional and only
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* used by the SPI transport layer at the moment */
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if (dev->pdata) {
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struct lis3lv02d_platform_data *p = dev->pdata;
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if (p->click_flags && (dev->whoami == LIS_SINGLE_ID)) {
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dev->write(dev, CLICK_CFG, p->click_flags);
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dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
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dev->write(dev, CLICK_LATENCY, p->click_latency);
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dev->write(dev, CLICK_WINDOW, p->click_window);
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dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
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dev->write(dev, CLICK_THSY_X,
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(p->click_thresh_x & 0xf) |
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(p->click_thresh_y << 4));
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}
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if (p->wakeup_flags && (dev->whoami == LIS_SINGLE_ID)) {
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dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
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dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
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/* default to 2.5ms for now */
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dev->write(dev, FF_WU_DURATION_1, 1);
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/* enable high pass filter for both free-fall units */
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dev->write(dev, CTRL_REG2, HP_FF_WU1 | HP_FF_WU2);
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}
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if (p->irq_cfg)
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dev->write(dev, CTRL_REG3, p->irq_cfg);
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}
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/* bail if we did not get an IRQ from the bus layer */
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if (!dev->irq) {
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printk(KERN_ERR DRIVER_NAME
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": No IRQ. Disabling /dev/freefall\n");
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goto out;
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}
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if (misc_register(&lis3lv02d_misc_device))
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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");
|
|
|