1209 lines
31 KiB
C
1209 lines
31 KiB
C
/*
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* sca3000_core.c -- support VTI sca3000 series accelerometers via SPI
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* Copyright (c) 2009 Jonathan Cameron <jic23@kernel.org>
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*
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* See industrialio/accels/sca3000.h for comments.
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*/
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#include <linux/interrupt.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/sysfs.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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#include <linux/iio/buffer.h>
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#include "sca3000.h"
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enum sca3000_variant {
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d01,
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e02,
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e04,
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e05,
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};
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/*
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* Note where option modes are not defined, the chip simply does not
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* support any.
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* Other chips in the sca3000 series use i2c and are not included here.
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*
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* Some of these devices are only listed in the family data sheet and
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* do not actually appear to be available.
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*/
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static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = {
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[d01] = {
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.scale = 7357,
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.temp_output = true,
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.measurement_mode_freq = 250,
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.option_mode_1 = SCA3000_OP_MODE_BYPASS,
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.option_mode_1_freq = 250,
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.mot_det_mult_xz = {50, 100, 200, 350, 650, 1300},
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.mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750},
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},
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[e02] = {
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.scale = 9810,
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.measurement_mode_freq = 125,
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.option_mode_1 = SCA3000_OP_MODE_NARROW,
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.option_mode_1_freq = 63,
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.mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050},
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.mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700},
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},
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[e04] = {
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.scale = 19620,
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.measurement_mode_freq = 100,
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.option_mode_1 = SCA3000_OP_MODE_NARROW,
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.option_mode_1_freq = 50,
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.option_mode_2 = SCA3000_OP_MODE_WIDE,
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.option_mode_2_freq = 400,
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.mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100},
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.mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000},
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},
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[e05] = {
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.scale = 61313,
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.measurement_mode_freq = 200,
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.option_mode_1 = SCA3000_OP_MODE_NARROW,
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.option_mode_1_freq = 50,
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.option_mode_2 = SCA3000_OP_MODE_WIDE,
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.option_mode_2_freq = 400,
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.mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900},
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.mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600},
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},
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};
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int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val)
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{
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st->tx[0] = SCA3000_WRITE_REG(address);
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st->tx[1] = val;
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return spi_write(st->us, st->tx, 2);
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}
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int sca3000_read_data_short(struct sca3000_state *st,
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u8 reg_address_high,
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int len)
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{
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struct spi_transfer xfer[2] = {
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{
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.len = 1,
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.tx_buf = st->tx,
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}, {
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.len = len,
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.rx_buf = st->rx,
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}
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};
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st->tx[0] = SCA3000_READ_REG(reg_address_high);
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return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
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}
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/**
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* sca3000_reg_lock_on() test if the ctrl register lock is on
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*
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* Lock must be held.
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**/
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static int sca3000_reg_lock_on(struct sca3000_state *st)
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{
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int ret;
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ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1);
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if (ret < 0)
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return ret;
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return !(st->rx[0] & SCA3000_LOCKED);
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}
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/**
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* __sca3000_unlock_reg_lock() unlock the control registers
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*
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* Note the device does not appear to support doing this in a single transfer.
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* This should only ever be used as part of ctrl reg read.
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* Lock must be held before calling this
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**/
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static int __sca3000_unlock_reg_lock(struct sca3000_state *st)
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{
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struct spi_transfer xfer[3] = {
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{
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.len = 2,
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.cs_change = 1,
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.tx_buf = st->tx,
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}, {
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.len = 2,
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.cs_change = 1,
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.tx_buf = st->tx + 2,
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}, {
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.len = 2,
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.tx_buf = st->tx + 4,
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},
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};
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st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK);
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st->tx[1] = 0x00;
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st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK);
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st->tx[3] = 0x50;
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st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK);
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st->tx[5] = 0xA0;
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return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
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}
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/**
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* sca3000_write_ctrl_reg() write to a lock protect ctrl register
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* @sel: selects which registers we wish to write to
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* @val: the value to be written
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*
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* Certain control registers are protected against overwriting by the lock
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* register and use a shared write address. This function allows writing of
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* these registers.
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* Lock must be held.
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**/
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static int sca3000_write_ctrl_reg(struct sca3000_state *st,
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u8 sel,
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uint8_t val)
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{
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int ret;
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ret = sca3000_reg_lock_on(st);
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if (ret < 0)
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goto error_ret;
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if (ret) {
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ret = __sca3000_unlock_reg_lock(st);
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if (ret)
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goto error_ret;
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}
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/* Set the control select register */
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ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, sel);
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if (ret)
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goto error_ret;
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/* Write the actual value into the register */
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ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_DATA, val);
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error_ret:
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return ret;
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}
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/**
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* sca3000_read_ctrl_reg() read from lock protected control register.
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*
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* Lock must be held.
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**/
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static int sca3000_read_ctrl_reg(struct sca3000_state *st,
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u8 ctrl_reg)
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{
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int ret;
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ret = sca3000_reg_lock_on(st);
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if (ret < 0)
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goto error_ret;
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if (ret) {
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ret = __sca3000_unlock_reg_lock(st);
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if (ret)
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goto error_ret;
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}
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/* Set the control select register */
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ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, ctrl_reg);
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if (ret)
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goto error_ret;
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ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_CTRL_DATA, 1);
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if (ret)
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goto error_ret;
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return st->rx[0];
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error_ret:
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return ret;
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}
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/**
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* sca3000_show_rev() - sysfs interface to read the chip revision number
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**/
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static ssize_t sca3000_show_rev(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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int len = 0, ret;
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct sca3000_state *st = iio_priv(indio_dev);
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mutex_lock(&st->lock);
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ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_REVID, 1);
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if (ret < 0)
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goto error_ret;
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len += sprintf(buf + len,
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"major=%d, minor=%d\n",
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st->rx[0] & SCA3000_REVID_MAJOR_MASK,
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st->rx[0] & SCA3000_REVID_MINOR_MASK);
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error_ret:
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mutex_unlock(&st->lock);
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return ret ? ret : len;
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}
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/**
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* sca3000_show_available_measurement_modes() display available modes
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*
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* This is all read from chip specific data in the driver. Not all
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* of the sca3000 series support modes other than normal.
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**/
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static ssize_t
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sca3000_show_available_measurement_modes(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 iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct sca3000_state *st = iio_priv(indio_dev);
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int len = 0;
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len += sprintf(buf + len, "0 - normal mode");
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switch (st->info->option_mode_1) {
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case SCA3000_OP_MODE_NARROW:
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len += sprintf(buf + len, ", 1 - narrow mode");
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break;
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case SCA3000_OP_MODE_BYPASS:
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len += sprintf(buf + len, ", 1 - bypass mode");
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break;
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}
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switch (st->info->option_mode_2) {
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case SCA3000_OP_MODE_WIDE:
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len += sprintf(buf + len, ", 2 - wide mode");
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break;
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}
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/* always supported */
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len += sprintf(buf + len, " 3 - motion detection\n");
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return len;
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}
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/**
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* sca3000_show_measurement_mode() sysfs read of current mode
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**/
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static ssize_t
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sca3000_show_measurement_mode(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 iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct sca3000_state *st = iio_priv(indio_dev);
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int len = 0, ret;
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mutex_lock(&st->lock);
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ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
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if (ret)
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goto error_ret;
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/* mask bottom 2 bits - only ones that are relevant */
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st->rx[0] &= 0x03;
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switch (st->rx[0]) {
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case SCA3000_MEAS_MODE_NORMAL:
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len += sprintf(buf + len, "0 - normal mode\n");
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break;
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case SCA3000_MEAS_MODE_MOT_DET:
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len += sprintf(buf + len, "3 - motion detection\n");
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break;
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case SCA3000_MEAS_MODE_OP_1:
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switch (st->info->option_mode_1) {
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case SCA3000_OP_MODE_NARROW:
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len += sprintf(buf + len, "1 - narrow mode\n");
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break;
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case SCA3000_OP_MODE_BYPASS:
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len += sprintf(buf + len, "1 - bypass mode\n");
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break;
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}
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break;
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case SCA3000_MEAS_MODE_OP_2:
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switch (st->info->option_mode_2) {
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case SCA3000_OP_MODE_WIDE:
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len += sprintf(buf + len, "2 - wide mode\n");
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break;
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}
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break;
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}
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error_ret:
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mutex_unlock(&st->lock);
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return ret ? ret : len;
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}
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/**
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* sca3000_store_measurement_mode() set the current mode
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**/
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static ssize_t
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sca3000_store_measurement_mode(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct sca3000_state *st = iio_priv(indio_dev);
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int ret;
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u8 mask = 0x03;
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u8 val;
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mutex_lock(&st->lock);
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ret = kstrtou8(buf, 10, &val);
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if (ret)
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goto error_ret;
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if (val > 3) {
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ret = -EINVAL;
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goto error_ret;
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}
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ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
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if (ret)
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goto error_ret;
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st->rx[0] &= ~mask;
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st->rx[0] |= (val & mask);
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ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, st->rx[0]);
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if (ret)
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goto error_ret;
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mutex_unlock(&st->lock);
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return len;
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error_ret:
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mutex_unlock(&st->lock);
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return ret;
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}
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/*
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* Not even vaguely standard attributes so defined here rather than
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* in the relevant IIO core headers
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*/
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static IIO_DEVICE_ATTR(measurement_mode_available, S_IRUGO,
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sca3000_show_available_measurement_modes,
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NULL, 0);
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static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR,
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sca3000_show_measurement_mode,
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sca3000_store_measurement_mode,
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0);
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/* More standard attributes */
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static IIO_DEVICE_ATTR(revision, S_IRUGO, sca3000_show_rev, NULL, 0);
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static const struct iio_event_spec sca3000_event = {
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.type = IIO_EV_TYPE_MAG,
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.dir = IIO_EV_DIR_RISING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE),
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};
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#define SCA3000_CHAN(index, mod) \
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{ \
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.type = IIO_ACCEL, \
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.modified = 1, \
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.channel2 = mod, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
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.address = index, \
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.scan_index = index, \
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.scan_type = { \
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.sign = 's', \
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.realbits = 11, \
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.storagebits = 16, \
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.shift = 5, \
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}, \
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.event_spec = &sca3000_event, \
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.num_event_specs = 1, \
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}
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static const struct iio_chan_spec sca3000_channels[] = {
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SCA3000_CHAN(0, IIO_MOD_X),
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SCA3000_CHAN(1, IIO_MOD_Y),
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SCA3000_CHAN(2, IIO_MOD_Z),
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};
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static const struct iio_chan_spec sca3000_channels_with_temp[] = {
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SCA3000_CHAN(0, IIO_MOD_X),
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SCA3000_CHAN(1, IIO_MOD_Y),
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SCA3000_CHAN(2, IIO_MOD_Z),
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OFFSET),
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/* No buffer support */
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.scan_index = -1,
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},
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};
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|
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static u8 sca3000_addresses[3][3] = {
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[0] = {SCA3000_REG_ADDR_X_MSB, SCA3000_REG_CTRL_SEL_MD_X_TH,
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SCA3000_MD_CTRL_OR_X},
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[1] = {SCA3000_REG_ADDR_Y_MSB, SCA3000_REG_CTRL_SEL_MD_Y_TH,
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SCA3000_MD_CTRL_OR_Y},
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[2] = {SCA3000_REG_ADDR_Z_MSB, SCA3000_REG_CTRL_SEL_MD_Z_TH,
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SCA3000_MD_CTRL_OR_Z},
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};
|
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|
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static int sca3000_read_raw(struct iio_dev *indio_dev,
|
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struct iio_chan_spec const *chan,
|
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int *val,
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int *val2,
|
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long mask)
|
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{
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struct sca3000_state *st = iio_priv(indio_dev);
|
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int ret;
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u8 address;
|
|
|
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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mutex_lock(&st->lock);
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if (chan->type == IIO_ACCEL) {
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if (st->mo_det_use_count) {
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mutex_unlock(&st->lock);
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return -EBUSY;
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}
|
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address = sca3000_addresses[chan->address][0];
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ret = sca3000_read_data_short(st, address, 2);
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if (ret < 0) {
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mutex_unlock(&st->lock);
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return ret;
|
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}
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*val = (be16_to_cpup((__be16 *)st->rx) >> 3) & 0x1FFF;
|
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*val = ((*val) << (sizeof(*val) * 8 - 13)) >>
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(sizeof(*val) * 8 - 13);
|
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} else {
|
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/* get the temperature when available */
|
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ret = sca3000_read_data_short(st,
|
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SCA3000_REG_ADDR_TEMP_MSB,
|
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2);
|
|
if (ret < 0) {
|
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mutex_unlock(&st->lock);
|
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return ret;
|
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}
|
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*val = ((st->rx[0] & 0x3F) << 3) |
|
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((st->rx[1] & 0xE0) >> 5);
|
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}
|
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mutex_unlock(&st->lock);
|
|
return IIO_VAL_INT;
|
|
case IIO_CHAN_INFO_SCALE:
|
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*val = 0;
|
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if (chan->type == IIO_ACCEL)
|
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*val2 = st->info->scale;
|
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else /* temperature */
|
|
*val2 = 555556;
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
case IIO_CHAN_INFO_OFFSET:
|
|
*val = -214;
|
|
*val2 = 600000;
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* sca3000_read_av_freq() sysfs function to get available frequencies
|
|
*
|
|
* The later modes are only relevant to the ring buffer - and depend on current
|
|
* mode. Note that data sheet gives rather wide tolerances for these so integer
|
|
* division will give good enough answer and not all chips have them specified
|
|
* at all.
|
|
**/
|
|
static ssize_t sca3000_read_av_freq(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int len = 0, ret, val;
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
|
|
val = st->rx[0];
|
|
mutex_unlock(&st->lock);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
switch (val & 0x03) {
|
|
case SCA3000_MEAS_MODE_NORMAL:
|
|
len += sprintf(buf + len, "%d %d %d\n",
|
|
st->info->measurement_mode_freq,
|
|
st->info->measurement_mode_freq / 2,
|
|
st->info->measurement_mode_freq / 4);
|
|
break;
|
|
case SCA3000_MEAS_MODE_OP_1:
|
|
len += sprintf(buf + len, "%d %d %d\n",
|
|
st->info->option_mode_1_freq,
|
|
st->info->option_mode_1_freq / 2,
|
|
st->info->option_mode_1_freq / 4);
|
|
break;
|
|
case SCA3000_MEAS_MODE_OP_2:
|
|
len += sprintf(buf + len, "%d %d %d\n",
|
|
st->info->option_mode_2_freq,
|
|
st->info->option_mode_2_freq / 2,
|
|
st->info->option_mode_2_freq / 4);
|
|
break;
|
|
}
|
|
return len;
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* __sca3000_get_base_freq() obtain mode specific base frequency
|
|
*
|
|
* lock must be held
|
|
**/
|
|
static inline int __sca3000_get_base_freq(struct sca3000_state *st,
|
|
const struct sca3000_chip_info *info,
|
|
int *base_freq)
|
|
{
|
|
int ret;
|
|
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
switch (0x03 & st->rx[0]) {
|
|
case SCA3000_MEAS_MODE_NORMAL:
|
|
*base_freq = info->measurement_mode_freq;
|
|
break;
|
|
case SCA3000_MEAS_MODE_OP_1:
|
|
*base_freq = info->option_mode_1_freq;
|
|
break;
|
|
case SCA3000_MEAS_MODE_OP_2:
|
|
*base_freq = info->option_mode_2_freq;
|
|
break;
|
|
}
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sca3000_read_frequency() sysfs interface to get the current frequency
|
|
**/
|
|
static ssize_t sca3000_read_frequency(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret, len = 0, base_freq = 0, val;
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = __sca3000_get_base_freq(st, st->info, &base_freq);
|
|
if (ret)
|
|
goto error_ret_mut;
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
|
|
mutex_unlock(&st->lock);
|
|
if (ret)
|
|
goto error_ret;
|
|
val = ret;
|
|
if (base_freq > 0)
|
|
switch (val & 0x03) {
|
|
case 0x00:
|
|
case 0x03:
|
|
len = sprintf(buf, "%d\n", base_freq);
|
|
break;
|
|
case 0x01:
|
|
len = sprintf(buf, "%d\n", base_freq / 2);
|
|
break;
|
|
case 0x02:
|
|
len = sprintf(buf, "%d\n", base_freq / 4);
|
|
break;
|
|
}
|
|
|
|
return len;
|
|
error_ret_mut:
|
|
mutex_unlock(&st->lock);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sca3000_set_frequency() sysfs interface to set the current frequency
|
|
**/
|
|
static ssize_t sca3000_set_frequency(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret, base_freq = 0;
|
|
int ctrlval;
|
|
int val;
|
|
|
|
ret = kstrtoint(buf, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_lock(&st->lock);
|
|
/* What mode are we in? */
|
|
ret = __sca3000_get_base_freq(st, st->info, &base_freq);
|
|
if (ret)
|
|
goto error_free_lock;
|
|
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
|
|
if (ret < 0)
|
|
goto error_free_lock;
|
|
ctrlval = ret;
|
|
/* clear the bits */
|
|
ctrlval &= ~0x03;
|
|
|
|
if (val == base_freq / 2) {
|
|
ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_2;
|
|
} else if (val == base_freq / 4) {
|
|
ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_4;
|
|
} else if (val != base_freq) {
|
|
ret = -EINVAL;
|
|
goto error_free_lock;
|
|
}
|
|
ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL,
|
|
ctrlval);
|
|
error_free_lock:
|
|
mutex_unlock(&st->lock);
|
|
|
|
return ret ? ret : len;
|
|
}
|
|
|
|
/*
|
|
* Should only really be registered if ring buffer support is compiled in.
|
|
* Does no harm however and doing it right would add a fair bit of complexity
|
|
*/
|
|
static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq);
|
|
|
|
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
|
|
sca3000_read_frequency,
|
|
sca3000_set_frequency);
|
|
|
|
/**
|
|
* sca3000_read_thresh() - query of a threshold
|
|
**/
|
|
static int sca3000_read_thresh(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir,
|
|
enum iio_event_info info,
|
|
int *val, int *val2)
|
|
{
|
|
int ret, i;
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int num = chan->channel2;
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_ctrl_reg(st, sca3000_addresses[num][1]);
|
|
mutex_unlock(&st->lock);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = 0;
|
|
if (num == 1)
|
|
for_each_set_bit(i, (unsigned long *)&ret,
|
|
ARRAY_SIZE(st->info->mot_det_mult_y))
|
|
*val += st->info->mot_det_mult_y[i];
|
|
else
|
|
for_each_set_bit(i, (unsigned long *)&ret,
|
|
ARRAY_SIZE(st->info->mot_det_mult_xz))
|
|
*val += st->info->mot_det_mult_xz[i];
|
|
|
|
return IIO_VAL_INT;
|
|
}
|
|
|
|
/**
|
|
* sca3000_write_thresh() control of threshold
|
|
**/
|
|
static int sca3000_write_thresh(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir,
|
|
enum iio_event_info info,
|
|
int val, int val2)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int num = chan->channel2;
|
|
int ret;
|
|
int i;
|
|
u8 nonlinear = 0;
|
|
|
|
if (num == 1) {
|
|
i = ARRAY_SIZE(st->info->mot_det_mult_y);
|
|
while (i > 0)
|
|
if (val >= st->info->mot_det_mult_y[--i]) {
|
|
nonlinear |= (1 << i);
|
|
val -= st->info->mot_det_mult_y[i];
|
|
}
|
|
} else {
|
|
i = ARRAY_SIZE(st->info->mot_det_mult_xz);
|
|
while (i > 0)
|
|
if (val >= st->info->mot_det_mult_xz[--i]) {
|
|
nonlinear |= (1 << i);
|
|
val -= st->info->mot_det_mult_xz[i];
|
|
}
|
|
}
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_write_ctrl_reg(st, sca3000_addresses[num][1], nonlinear);
|
|
mutex_unlock(&st->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct attribute *sca3000_attributes[] = {
|
|
&iio_dev_attr_revision.dev_attr.attr,
|
|
&iio_dev_attr_measurement_mode_available.dev_attr.attr,
|
|
&iio_dev_attr_measurement_mode.dev_attr.attr,
|
|
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
|
|
&iio_dev_attr_sampling_frequency.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group sca3000_attribute_group = {
|
|
.attrs = sca3000_attributes,
|
|
};
|
|
|
|
/**
|
|
* sca3000_event_handler() - handling ring and non ring events
|
|
*
|
|
* Ring related interrupt handler. Depending on event, push to
|
|
* the ring buffer event chrdev or the event one.
|
|
*
|
|
* This function is complicated by the fact that the devices can signify ring
|
|
* and non ring events via the same interrupt line and they can only
|
|
* be distinguished via a read of the relevant status register.
|
|
**/
|
|
static irqreturn_t sca3000_event_handler(int irq, void *private)
|
|
{
|
|
struct iio_dev *indio_dev = private;
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret, val;
|
|
s64 last_timestamp = iio_get_time_ns();
|
|
|
|
/*
|
|
* Could lead if badly timed to an extra read of status reg,
|
|
* but ensures no interrupt is missed.
|
|
*/
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1);
|
|
val = st->rx[0];
|
|
mutex_unlock(&st->lock);
|
|
if (ret)
|
|
goto done;
|
|
|
|
sca3000_ring_int_process(val, indio_dev->buffer);
|
|
|
|
if (val & SCA3000_INT_STATUS_FREE_FALL)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
|
0,
|
|
IIO_MOD_X_AND_Y_AND_Z,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_FALLING),
|
|
last_timestamp);
|
|
|
|
if (val & SCA3000_INT_STATUS_Y_TRIGGER)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
|
0,
|
|
IIO_MOD_Y,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_RISING),
|
|
last_timestamp);
|
|
|
|
if (val & SCA3000_INT_STATUS_X_TRIGGER)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
|
0,
|
|
IIO_MOD_X,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_RISING),
|
|
last_timestamp);
|
|
|
|
if (val & SCA3000_INT_STATUS_Z_TRIGGER)
|
|
iio_push_event(indio_dev,
|
|
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
|
0,
|
|
IIO_MOD_Z,
|
|
IIO_EV_TYPE_MAG,
|
|
IIO_EV_DIR_RISING),
|
|
last_timestamp);
|
|
|
|
done:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* sca3000_read_event_config() what events are enabled
|
|
**/
|
|
static int sca3000_read_event_config(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret;
|
|
u8 protect_mask = 0x03;
|
|
int num = chan->channel2;
|
|
|
|
/* read current value of mode register */
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
if ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET) {
|
|
ret = 0;
|
|
} else {
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
/* only supporting logical or's for now */
|
|
ret = !!(ret & sca3000_addresses[num][2]);
|
|
}
|
|
error_ret:
|
|
mutex_unlock(&st->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sca3000_query_free_fall_mode() is free fall mode enabled
|
|
**/
|
|
static ssize_t sca3000_query_free_fall_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
int ret;
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int val;
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
|
|
val = st->rx[0];
|
|
mutex_unlock(&st->lock);
|
|
if (ret < 0)
|
|
return ret;
|
|
return sprintf(buf, "%d\n", !!(val & SCA3000_FREE_FALL_DETECT));
|
|
}
|
|
|
|
/**
|
|
* sca3000_set_free_fall_mode() simple on off control for free fall int
|
|
*
|
|
* In these chips the free fall detector should send an interrupt if
|
|
* the device falls more than 25cm. This has not been tested due
|
|
* to fragile wiring.
|
|
**/
|
|
static ssize_t sca3000_set_free_fall_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
u8 val;
|
|
int ret;
|
|
u8 protect_mask = SCA3000_FREE_FALL_DETECT;
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = kstrtou8(buf, 10, &val);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
/* read current value of mode register */
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
/* if off and should be on */
|
|
if (val && !(st->rx[0] & protect_mask))
|
|
ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
|
|
(st->rx[0] | SCA3000_FREE_FALL_DETECT));
|
|
/* if on and should be off */
|
|
else if (!val && (st->rx[0] & protect_mask))
|
|
ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
|
|
(st->rx[0] & ~protect_mask));
|
|
error_ret:
|
|
mutex_unlock(&st->lock);
|
|
|
|
return ret ? ret : len;
|
|
}
|
|
|
|
/**
|
|
* sca3000_write_event_config() simple on off control for motion detector
|
|
*
|
|
* This is a per axis control, but enabling any will result in the
|
|
* motion detector unit being enabled.
|
|
* N.B. enabling motion detector stops normal data acquisition.
|
|
* There is a complexity in knowing which mode to return to when
|
|
* this mode is disabled. Currently normal mode is assumed.
|
|
**/
|
|
static int sca3000_write_event_config(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan,
|
|
enum iio_event_type type,
|
|
enum iio_event_direction dir,
|
|
int state)
|
|
{
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
int ret, ctrlval;
|
|
u8 protect_mask = 0x03;
|
|
int num = chan->channel2;
|
|
|
|
mutex_lock(&st->lock);
|
|
/*
|
|
* First read the motion detector config to find out if
|
|
* this axis is on
|
|
*/
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
|
|
if (ret < 0)
|
|
goto exit_point;
|
|
ctrlval = ret;
|
|
/* if off and should be on */
|
|
if (state && !(ctrlval & sca3000_addresses[num][2])) {
|
|
ret = sca3000_write_ctrl_reg(st,
|
|
SCA3000_REG_CTRL_SEL_MD_CTRL,
|
|
ctrlval |
|
|
sca3000_addresses[num][2]);
|
|
if (ret)
|
|
goto exit_point;
|
|
st->mo_det_use_count++;
|
|
} else if (!state && (ctrlval & sca3000_addresses[num][2])) {
|
|
ret = sca3000_write_ctrl_reg(st,
|
|
SCA3000_REG_CTRL_SEL_MD_CTRL,
|
|
ctrlval &
|
|
~(sca3000_addresses[num][2]));
|
|
if (ret)
|
|
goto exit_point;
|
|
st->mo_det_use_count--;
|
|
}
|
|
|
|
/* read current value of mode register */
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
|
|
if (ret)
|
|
goto exit_point;
|
|
/* if off and should be on */
|
|
if ((st->mo_det_use_count) &&
|
|
((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET))
|
|
ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
|
|
(st->rx[0] & ~protect_mask)
|
|
| SCA3000_MEAS_MODE_MOT_DET);
|
|
/* if on and should be off */
|
|
else if (!(st->mo_det_use_count) &&
|
|
((st->rx[0] & protect_mask) == SCA3000_MEAS_MODE_MOT_DET))
|
|
ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
|
|
(st->rx[0] & ~protect_mask));
|
|
exit_point:
|
|
mutex_unlock(&st->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Free fall detector related event attribute */
|
|
static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en,
|
|
in_accel_x & y & z_mag_falling_en,
|
|
S_IRUGO | S_IWUSR,
|
|
sca3000_query_free_fall_mode,
|
|
sca3000_set_free_fall_mode,
|
|
0);
|
|
|
|
static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period,
|
|
in_accel_x & y & z_mag_falling_period,
|
|
"0.226");
|
|
|
|
static struct attribute *sca3000_event_attributes[] = {
|
|
&iio_dev_attr_accel_xayaz_mag_falling_en.dev_attr.attr,
|
|
&iio_const_attr_accel_xayaz_mag_falling_period.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group sca3000_event_attribute_group = {
|
|
.attrs = sca3000_event_attributes,
|
|
.name = "events",
|
|
};
|
|
|
|
/**
|
|
* sca3000_clean_setup() get the device into a predictable state
|
|
*
|
|
* Devices use flash memory to store many of the register values
|
|
* and hence can come up in somewhat unpredictable states.
|
|
* Hence reset everything on driver load.
|
|
**/
|
|
static int sca3000_clean_setup(struct sca3000_state *st)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&st->lock);
|
|
/* Ensure all interrupts have been acknowledged */
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
/* Turn off all motion detection channels */
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL,
|
|
ret & SCA3000_MD_CTRL_PROT_MASK);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
/* Disable ring buffer */
|
|
ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
|
|
ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL,
|
|
(ret & SCA3000_OUT_CTRL_PROT_MASK)
|
|
| SCA3000_OUT_CTRL_BUF_X_EN
|
|
| SCA3000_OUT_CTRL_BUF_Y_EN
|
|
| SCA3000_OUT_CTRL_BUF_Z_EN
|
|
| SCA3000_OUT_CTRL_BUF_DIV_4);
|
|
if (ret)
|
|
goto error_ret;
|
|
/* Enable interrupts, relevant to mode and set up as active low */
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = sca3000_write_reg(st,
|
|
SCA3000_REG_ADDR_INT_MASK,
|
|
(ret & SCA3000_INT_MASK_PROT_MASK)
|
|
| SCA3000_INT_MASK_ACTIVE_LOW);
|
|
if (ret)
|
|
goto error_ret;
|
|
/*
|
|
* Select normal measurement mode, free fall off, ring off
|
|
* Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5
|
|
* as that occurs in one of the example on the datasheet
|
|
*/
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
|
|
(st->rx[0] & SCA3000_MODE_PROT_MASK));
|
|
st->bpse = 11;
|
|
|
|
error_ret:
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
}
|
|
|
|
static const struct iio_info sca3000_info = {
|
|
.attrs = &sca3000_attribute_group,
|
|
.read_raw = &sca3000_read_raw,
|
|
.event_attrs = &sca3000_event_attribute_group,
|
|
.read_event_value = &sca3000_read_thresh,
|
|
.write_event_value = &sca3000_write_thresh,
|
|
.read_event_config = &sca3000_read_event_config,
|
|
.write_event_config = &sca3000_write_event_config,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
static int sca3000_probe(struct spi_device *spi)
|
|
{
|
|
int ret;
|
|
struct sca3000_state *st;
|
|
struct iio_dev *indio_dev;
|
|
|
|
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
st = iio_priv(indio_dev);
|
|
spi_set_drvdata(spi, indio_dev);
|
|
st->us = spi;
|
|
mutex_init(&st->lock);
|
|
st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi)
|
|
->driver_data];
|
|
|
|
indio_dev->dev.parent = &spi->dev;
|
|
indio_dev->name = spi_get_device_id(spi)->name;
|
|
indio_dev->info = &sca3000_info;
|
|
if (st->info->temp_output) {
|
|
indio_dev->channels = sca3000_channels_with_temp;
|
|
indio_dev->num_channels =
|
|
ARRAY_SIZE(sca3000_channels_with_temp);
|
|
} else {
|
|
indio_dev->channels = sca3000_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(sca3000_channels);
|
|
}
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
sca3000_configure_ring(indio_dev);
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (spi->irq) {
|
|
ret = request_threaded_irq(spi->irq,
|
|
NULL,
|
|
&sca3000_event_handler,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
"sca3000",
|
|
indio_dev);
|
|
if (ret)
|
|
goto error_unregister_dev;
|
|
}
|
|
sca3000_register_ring_funcs(indio_dev);
|
|
ret = sca3000_clean_setup(st);
|
|
if (ret)
|
|
goto error_free_irq;
|
|
return 0;
|
|
|
|
error_free_irq:
|
|
if (spi->irq)
|
|
free_irq(spi->irq, indio_dev);
|
|
error_unregister_dev:
|
|
iio_device_unregister(indio_dev);
|
|
return ret;
|
|
}
|
|
|
|
static int sca3000_stop_all_interrupts(struct sca3000_state *st)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK,
|
|
(st->rx[0] &
|
|
~(SCA3000_INT_MASK_RING_THREE_QUARTER |
|
|
SCA3000_INT_MASK_RING_HALF |
|
|
SCA3000_INT_MASK_ALL_INTS)));
|
|
error_ret:
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int sca3000_remove(struct spi_device *spi)
|
|
{
|
|
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
|
struct sca3000_state *st = iio_priv(indio_dev);
|
|
|
|
/* Must ensure no interrupts can be generated after this! */
|
|
sca3000_stop_all_interrupts(st);
|
|
if (spi->irq)
|
|
free_irq(spi->irq, indio_dev);
|
|
iio_device_unregister(indio_dev);
|
|
sca3000_unconfigure_ring(indio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct spi_device_id sca3000_id[] = {
|
|
{"sca3000_d01", d01},
|
|
{"sca3000_e02", e02},
|
|
{"sca3000_e04", e04},
|
|
{"sca3000_e05", e05},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, sca3000_id);
|
|
|
|
static struct spi_driver sca3000_driver = {
|
|
.driver = {
|
|
.name = "sca3000",
|
|
},
|
|
.probe = sca3000_probe,
|
|
.remove = sca3000_remove,
|
|
.id_table = sca3000_id,
|
|
};
|
|
module_spi_driver(sca3000_driver);
|
|
|
|
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
|
|
MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver");
|
|
MODULE_LICENSE("GPL v2");
|