586 lines
15 KiB
C
586 lines
15 KiB
C
/*
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* fxls8471.c - Linux kernel modules for 3-Axis Accel sensor
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* Copyright (C) 2014-2015 Freescale Semiconductor, Inc. All Rights Reserved.
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/pm.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/input-polldev.h>
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#include <linux/miscdevice.h>
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#include <linux/poll.h>
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#include "fxls8471.h"
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#define SENSOR_IOCTL_BASE 'S'
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#define SENSOR_GET_MODEL_NAME _IOR(SENSOR_IOCTL_BASE, 0, char *)
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#define SENSOR_GET_POWER_STATUS _IOR(SENSOR_IOCTL_BASE, 2, int)
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#define SENSOR_SET_POWER_STATUS _IOR(SENSOR_IOCTL_BASE, 3, int)
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#define SENSOR_GET_DELAY_TIME _IOR(SENSOR_IOCTL_BASE, 4, int)
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#define SENSOR_SET_DELAY_TIME _IOR(SENSOR_IOCTL_BASE, 5, int)
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#define SENSOR_GET_RAW_DATA _IOR(SENSOR_IOCTL_BASE, 6, short[3])
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#define FXLS8471_POSITION_DEFAULT 2
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#define FXLS8471_DELAY_DEFAULT 200
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#define FXLS8471_STATUS_ZYXDR 0x08
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#define FXLS8471_BUF_SIZE 6
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struct fxls8471_data fxls8471_dev;
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EXPORT_SYMBOL(fxls8471_dev);
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static int fxls8471_position_setting[8][3][3] = {
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{{0, -1, 0}, {1, 0, 0}, {0, 0, 1} },
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{{-1, 0, 0}, {0, -1, 0}, {0, 0, 1} },
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{{0, 1, 0}, {-1, 0, 0}, {0, 0, 1} },
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{{1, 0, 0}, {0, 1, 0}, {0, 0, 1} },
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{{0, -1, 0}, {-1, 0, 0}, {0, 0, -1} },
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{{-1, 0, 0}, {0, 1, 0}, {0, 0, -1} },
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{{0, 1, 0}, {1, 0, 0}, {0, 0, -1} },
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{{1, 0, 0}, {0, -1, 0}, {0, 0, -1} },
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};
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static int fxls8471_bus_write(struct fxls8471_data *pdata, u8 reg, u8 val)
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{
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if (pdata && pdata->write)
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return pdata->write(pdata, reg, val);
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return -EIO;
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}
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static int fxls8471_bus_read(struct fxls8471_data *pdata, u8 reg)
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{
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if (pdata && pdata->read)
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return pdata->read(pdata, reg);
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return -EIO;
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}
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static int fxls8471_bus_read_block(struct fxls8471_data *pdata, u8 reg, u8 len,
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u8 *val)
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{
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if (pdata && pdata->read_block)
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return pdata->read_block(pdata, reg, len, val);
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return -EIO;
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}
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static int fxls8471_data_convert(struct fxls8471_data *pdata,
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struct fxls8471_data_axis *axis_data)
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{
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short rawdata[3], data[3];
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int i, j;
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int position = atomic_read(&pdata->position);
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if (position < 0 || position > 7)
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position = 0;
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rawdata[0] = axis_data->x;
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rawdata[1] = axis_data->y;
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rawdata[2] = axis_data->z;
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for (i = 0; i < 3; i++) {
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data[i] = 0;
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for (j = 0; j < 3; j++)
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data[i] +=
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rawdata[j] *
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fxls8471_position_setting[position][i][j];
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}
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axis_data->x = data[0];
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axis_data->y = data[1];
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axis_data->z = data[2];
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return 0;
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}
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static int fxls8471_device_init(struct fxls8471_data *pdata)
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{
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int result;
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result = fxls8471_bus_write(pdata, FXLS8471_CTRL_REG1, 0);
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if (result < 0)
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goto out;
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result = fxls8471_bus_write(pdata, FXLS8471_XYZ_DATA_CFG, MODE_2G);
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if (result < 0)
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goto out;
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if (pdata->irq) {
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result = fxls8471_bus_write(pdata, FXLS8471_CTRL_REG5, 0x01);
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if (result < 0)
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goto out;
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result = fxls8471_bus_write(pdata, FXLS8471_CTRL_REG4, 0x01);
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if (result < 0)
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goto out;
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}
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atomic_set(&pdata->active, STANDBY);
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return 0;
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out:
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printk("FXLS8471 device init error\n");
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return result;
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}
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static int fxls8471_change_mode(struct fxls8471_data *pdata, int mode)
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{
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u8 val;
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int ret;
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val = fxls8471_bus_read(pdata, FXLS8471_CTRL_REG1);
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if (mode == ACTIVED)
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val |= 0x01;
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else
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val &= (~0x01);
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ret = fxls8471_bus_write(pdata, FXLS8471_CTRL_REG1, val);
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return ret;
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}
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static int fxls8471_set_delay(struct fxls8471_data *pdata, int delay)
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{
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u8 val;
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val = fxls8471_bus_read(pdata, FXLS8471_CTRL_REG1);
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/* set sensor standby */
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fxls8471_bus_write(pdata, FXLS8471_CTRL_REG1, (val & ~0x01));
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val &= ~(0x7 << 3);
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if (delay <= 10)
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val |= 0x02 << 3;
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else if (delay <= 20)
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val |= 0x03 << 3;
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else if (delay <= 67)
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val |= 0x04 << 3;
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else
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val |= 0x05 << 3;
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/* set sensor standby */
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fxls8471_bus_write(pdata, FXLS8471_CTRL_REG1, val);
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return 0;
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}
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static int fxls8471_change_range(struct fxls8471_data *pdata, int range)
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{
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int ret;
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ret = fxls8471_bus_write(pdata, FXLS8471_XYZ_DATA_CFG, range);
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return ret;
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}
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static int fxls8471_read_data(struct fxls8471_data *pdata,
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struct fxls8471_data_axis *data)
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{
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u8 tmp_data[FXLS8471_BUF_SIZE];
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int ret;
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ret = fxls8471_bus_read_block(pdata, FXLS8471_OUT_X_MSB,
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FXLS8471_BUF_SIZE, tmp_data);
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if (ret < FXLS8471_BUF_SIZE) {
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printk(KERN_ERR "FXLS8471 read sensor block data error\n");
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return -EIO;
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}
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data->x = ((tmp_data[0] << 8) & 0xff00) | tmp_data[1];
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data->y = ((tmp_data[2] << 8) & 0xff00) | tmp_data[3];
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data->z = ((tmp_data[4] << 8) & 0xff00) | tmp_data[5];
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return 0;
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}
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/* fxls8471 miscdevice */
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static long fxls8471_ioctl(struct file *file, unsigned int reg,
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unsigned long arg)
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{
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struct fxls8471_data *pdata = file->private_data;
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void __user *argp = (void __user *)arg;
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long ret = 0;
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short sdata[3];
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int enable;
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int delay;
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struct fxls8471_data_axis data;
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if (!pdata) {
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printk(KERN_ERR "FXLS8471 struct datt point is NULL.");
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return -EFAULT;
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}
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switch (reg) {
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case SENSOR_GET_MODEL_NAME:
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if (copy_to_user(argp, "fxls8471", strlen("fxls8471") + 1)) {
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printk(KERN_ERR
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"SENSOR_GET_MODEL_NAME copy_to_user failed.");
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ret = -EFAULT;
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}
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break;
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case SENSOR_GET_POWER_STATUS:
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enable = atomic_read(&pdata->active);
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if (copy_to_user(argp, &enable, sizeof(int))) {
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printk(KERN_ERR
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"SENSOR_SET_POWER_STATUS copy_to_user failed.");
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ret = -EFAULT;
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}
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break;
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case SENSOR_SET_POWER_STATUS:
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if (copy_from_user(&enable, argp, sizeof(int))) {
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printk(KERN_ERR
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"SENSOR_SET_POWER_STATUS copy_to_user failed.");
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ret = -EFAULT;
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}
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if (pdata) {
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ret =
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fxls8471_change_mode(pdata,
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enable ? ACTIVED : STANDBY);
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if (!ret)
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atomic_set(&pdata->active, enable);
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}
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break;
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case SENSOR_GET_DELAY_TIME:
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delay = atomic_read(&pdata->delay);
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if (copy_to_user(argp, &delay, sizeof(delay))) {
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printk(KERN_ERR
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"SENSOR_GET_DELAY_TIME copy_to_user failed.");
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return -EFAULT;
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}
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break;
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case SENSOR_SET_DELAY_TIME:
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if (copy_from_user(&delay, argp, sizeof(int))) {
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printk(KERN_ERR
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"SENSOR_GET_DELAY_TIME copy_to_user failed.");
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ret = -EFAULT;
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}
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if (pdata && delay > 0 && delay <= 500) {
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ret = fxls8471_set_delay(pdata, delay);
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if (!ret)
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atomic_set(&pdata->delay, delay);
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}
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break;
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case SENSOR_GET_RAW_DATA:
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ret = fxls8471_read_data(pdata, &data);
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if (!ret) {
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fxls8471_data_convert(pdata, &data);
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sdata[0] = data.x;
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sdata[1] = data.y;
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sdata[2] = data.z;
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if (copy_to_user(argp, sdata, sizeof(sdata))) {
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printk(KERN_ERR
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"SENSOR_GET_RAW_DATA copy_to_user failed.");
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ret = -EFAULT;
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}
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}
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break;
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default:
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ret = -1;
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}
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return ret;
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}
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static int fxls8471_open(struct inode *inode, struct file *file)
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{
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file->private_data = &fxls8471_dev;
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return nonseekable_open(inode, file);
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}
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static int fxls8471_release(struct inode *inode, struct file *file)
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{
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/* note: releasing the wdt in NOWAYOUT-mode does not stop it */
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return 0;
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}
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static const struct file_operations fxls8471_fops = {
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.owner = THIS_MODULE,
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.open = fxls8471_open,
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.release = fxls8471_release,
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.unlocked_ioctl = fxls8471_ioctl,
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};
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static struct miscdevice fxls8471_device = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "FreescaleAccelerometer",
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.fops = &fxls8471_fops,
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};
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static ssize_t fxls8471_enable_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fxls8471_data *pdata = &fxls8471_dev;
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int enable = 0;
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enable = atomic_read(&pdata->active);
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return sprintf(buf, "%d\n", enable);
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}
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static ssize_t fxls8471_enable_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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struct fxls8471_data *pdata = &fxls8471_dev;
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int ret;
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unsigned long enable;
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if (kstrtoul(buf, 10, &enable) < 0)
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return -EINVAL;
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enable = (enable > 0) ? 1 : 0;
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ret = fxls8471_change_mode(pdata, (enable > 0 ? ACTIVED : STANDBY));
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if (!ret) {
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atomic_set(&pdata->active, enable);
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if (enable)
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printk(KERN_INFO "mma enable setting actived\n");
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else
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printk(KERN_INFO "mma enable setting standby\n");
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}
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return count;
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}
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static ssize_t fxls8471_poll_delay_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct fxls8471_data *pdata = &fxls8471_dev;
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int delay = 0;
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delay = atomic_read(&pdata->delay);
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return sprintf(buf, "%d\n", delay);
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}
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static ssize_t fxls8471_poll_delay_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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struct fxls8471_data *pdata = &fxls8471_dev;
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int ret;
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unsigned long delay;
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if (kstrtoul(buf, 10, &delay) < 0)
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return -EINVAL;
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ret = fxls8471_set_delay(pdata, delay);
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if (!ret)
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atomic_set(&pdata->delay, delay);
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return count;
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}
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static ssize_t fxls8471_position_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fxls8471_data *pdata = &fxls8471_dev;
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int position = 0;
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position = atomic_read(&pdata->position);
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return sprintf(buf, "%d\n", position);
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}
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static ssize_t fxls8471_position_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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struct fxls8471_data *pdata = &fxls8471_dev;
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unsigned long position;
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if (kstrtoul(buf, 10, &position) < 0)
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return -EINVAL;
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atomic_set(&pdata->position, position);
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return count;
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}
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static ssize_t fxls8471_data_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fxls8471_data *pdata = &fxls8471_dev;
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int ret = 0;
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struct fxls8471_data_axis data;
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ret = fxls8471_read_data(pdata, &data);
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if (!ret)
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fxls8471_data_convert(pdata, &data);
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return sprintf(buf, "%d,%d,%d\n", data.x, data.y, data.z);
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}
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static ssize_t fxls8471_range_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fxls8471_data *pdata = &fxls8471_dev;
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int range = 0;
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range = atomic_read(&pdata->range);
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return sprintf(buf, "%d\n", range);
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}
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static ssize_t fxls8471_range_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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struct fxls8471_data *pdata = &fxls8471_dev;
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int ret;
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unsigned long range;
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if (kstrtoul(buf, 10, &range) < 0)
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return -EINVAL;
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if (range == atomic_read(&pdata->range))
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return count;
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if (atomic_read(&pdata->active))
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printk(KERN_INFO "Pls set the sensor standby and then actived\n");
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ret = fxls8471_change_range(pdata, range);
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if (!ret)
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atomic_set(&pdata->range, range);
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return count;
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}
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static DEVICE_ATTR(enable, S_IWUSR | S_IRUGO, fxls8471_enable_show, fxls8471_enable_store);
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static DEVICE_ATTR(poll_delay, S_IWUSR | S_IRUGO, fxls8471_poll_delay_show,
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fxls8471_poll_delay_store);
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static DEVICE_ATTR(position, S_IWUSR | S_IRUGO, fxls8471_position_show,
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fxls8471_position_store);
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static DEVICE_ATTR(data, S_IWUSR | S_IRUGO, fxls8471_data_show, NULL);
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static DEVICE_ATTR(range, S_IWUSR | S_IRUGO, fxls8471_range_show, fxls8471_range_store);
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static struct attribute *fxls8471_attributes[] = {
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&dev_attr_enable.attr,
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&dev_attr_poll_delay.attr,
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&dev_attr_position.attr,
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&dev_attr_data.attr,
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&dev_attr_range.attr,
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NULL
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};
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static const struct attribute_group fxls8471_attr_group = {
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.attrs = fxls8471_attributes,
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};
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static irqreturn_t fxls8471_irq_handler(int irq, void *dev)
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{
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int ret;
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u8 int_src;
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struct fxls8471_data *pdata = (struct fxls8471_data *)dev;
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struct fxls8471_data_axis data;
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int_src = fxls8471_bus_read(pdata, FXLS8471_INT_SOURCE);
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/* data ready interrupt */
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if (int_src & 0x01) {
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ret = fxls8471_read_data(pdata, &data);
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if (!ret) {
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fxls8471_data_convert(pdata, &data);
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input_report_abs(pdata->idev, ABS_X, data.x);
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input_report_abs(pdata->idev, ABS_Y, data.y);
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input_report_abs(pdata->idev, ABS_Z, data.z);
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input_sync(pdata->idev);
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}
|
|
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
int fxls8471_driver_init(struct fxls8471_data *pdata)
|
|
{
|
|
int result, chip_id;
|
|
|
|
chip_id = fxls8471_bus_read(pdata, FXLS8471_WHO_AM_I);
|
|
|
|
if (chip_id != FXSL8471_ID) {
|
|
printk(KERN_ERR "read sensor who am i (0x%x)error !\n",
|
|
chip_id);
|
|
result = -EINVAL;
|
|
goto err_out;
|
|
}
|
|
/* Initialize the FXLS8471 chip */
|
|
pdata->chip_id = chip_id;
|
|
atomic_set(&pdata->delay, FXLS8471_DELAY_DEFAULT);
|
|
atomic_set(&pdata->position, FXLS8471_POSITION_DEFAULT);
|
|
result = misc_register(&fxls8471_device);
|
|
if (result != 0) {
|
|
printk(KERN_ERR "register acc miscdevice error");
|
|
goto err_out;
|
|
}
|
|
|
|
result =
|
|
sysfs_create_group(&fxls8471_device.this_device->kobj,
|
|
&fxls8471_attr_group);
|
|
if (result) {
|
|
printk(KERN_ERR "create device file failed!\n");
|
|
result = -EINVAL;
|
|
goto err_create_sysfs;
|
|
}
|
|
/*create data input device */
|
|
pdata->idev = input_allocate_device();
|
|
if (!pdata->idev) {
|
|
result = -ENOMEM;
|
|
printk(KERN_ERR "alloc fxls8471 input device failed!\n");
|
|
goto err_alloc_input_device;
|
|
}
|
|
pdata->idev->name = "FreescaleAccelerometer";
|
|
pdata->idev->id.bustype = BUS_I2C;
|
|
pdata->idev->evbit[0] = BIT_MASK(EV_ABS);
|
|
input_set_abs_params(pdata->idev, ABS_X, -0x7fff, 0x7fff, 0, 0);
|
|
input_set_abs_params(pdata->idev, ABS_Y, -0x7fff, 0x7fff, 0, 0);
|
|
input_set_abs_params(pdata->idev, ABS_Z, -0x7fff, 0x7fff, 0, 0);
|
|
result = input_register_device(pdata->idev);
|
|
if (result) {
|
|
printk(KERN_ERR "register fxls8471 input device failed!\n");
|
|
goto err_register_input_device;
|
|
}
|
|
if (pdata->irq) {
|
|
result =
|
|
request_threaded_irq(pdata->irq, NULL, fxls8471_irq_handler,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
|
pdata->idev->name, pdata);
|
|
if (result < 0) {
|
|
printk(KERN_ERR "failed to register MMA8x5x irq %d!\n",
|
|
pdata->irq);
|
|
goto err_register_irq;
|
|
}
|
|
}
|
|
fxls8471_device_init(pdata);
|
|
fxls8471_set_delay(pdata, atomic_read(&pdata->delay));
|
|
|
|
printk("fxls8471 device driver probe successfully\n");
|
|
return 0;
|
|
err_register_irq:
|
|
input_unregister_device(pdata->idev);
|
|
err_register_input_device:
|
|
input_free_device(pdata->idev);
|
|
err_alloc_input_device:
|
|
sysfs_remove_group(&fxls8471_device.this_device->kobj,
|
|
&fxls8471_attr_group);
|
|
err_create_sysfs:
|
|
misc_deregister(&fxls8471_device);
|
|
err_out:
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fxls8471_driver_init);
|
|
|
|
int fxls8471_driver_remove(struct fxls8471_data *pdata)
|
|
{
|
|
fxls8471_change_mode(pdata, STANDBY);
|
|
misc_deregister(&fxls8471_device);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fxls8471_driver_remove);
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
int fxls8471_driver_suspend(struct fxls8471_data *pdata)
|
|
{
|
|
if (atomic_read(&pdata->active))
|
|
fxls8471_change_mode(pdata, STANDBY);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fxls8471_driver_suspend);
|
|
|
|
int fxls8471_driver_resume(struct fxls8471_data *pdata)
|
|
{
|
|
if (atomic_read(&pdata->active))
|
|
fxls8471_change_mode(pdata, ACTIVED);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fxls8471_driver_resume);
|
|
|
|
#endif
|