557 lines
13 KiB
C
557 lines
13 KiB
C
/*
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* ADIS16201 Programmable Digital Vibration Sensor driver
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*
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* Copyright 2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/module.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "../buffer.h"
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#include "adis16201.h"
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enum adis16201_chan {
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in_supply,
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temp,
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accel_x,
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accel_y,
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incli_x,
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incli_y,
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in_aux,
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};
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/**
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* adis16201_spi_write_reg_8() - write single byte to a register
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* @dev: device associated with child of actual device (iio_dev or iio_trig)
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* @reg_address: the address of the register to be written
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* @val: the value to write
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**/
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static int adis16201_spi_write_reg_8(struct iio_dev *indio_dev,
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u8 reg_address,
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u8 val)
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{
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int ret;
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struct adis16201_state *st = iio_priv(indio_dev);
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mutex_lock(&st->buf_lock);
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st->tx[0] = ADIS16201_WRITE_REG(reg_address);
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st->tx[1] = val;
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ret = spi_write(st->us, st->tx, 2);
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mutex_unlock(&st->buf_lock);
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return ret;
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}
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/**
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* adis16201_spi_write_reg_16() - write 2 bytes to a pair of registers
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* @indio_dev: iio device associated with child of actual device
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* @reg_address: the address of the lower of the two registers. Second register
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* is assumed to have address one greater.
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* @val: value to be written
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**/
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static int adis16201_spi_write_reg_16(struct iio_dev *indio_dev,
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u8 lower_reg_address,
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u16 value)
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{
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int ret;
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struct spi_message msg;
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struct adis16201_state *st = iio_priv(indio_dev);
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struct spi_transfer xfers[] = {
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{
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.tx_buf = st->tx,
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.bits_per_word = 8,
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.len = 2,
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.cs_change = 1,
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}, {
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.tx_buf = st->tx + 2,
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.bits_per_word = 8,
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.len = 2,
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},
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};
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mutex_lock(&st->buf_lock);
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st->tx[0] = ADIS16201_WRITE_REG(lower_reg_address);
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st->tx[1] = value & 0xFF;
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st->tx[2] = ADIS16201_WRITE_REG(lower_reg_address + 1);
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st->tx[3] = (value >> 8) & 0xFF;
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spi_message_init(&msg);
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spi_message_add_tail(&xfers[0], &msg);
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spi_message_add_tail(&xfers[1], &msg);
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ret = spi_sync(st->us, &msg);
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mutex_unlock(&st->buf_lock);
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return ret;
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}
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/**
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* adis16201_spi_read_reg_16() - read 2 bytes from a 16-bit register
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* @indio_dev: iio device associated with child of actual device
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* @reg_address: the address of the lower of the two registers. Second register
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* is assumed to have address one greater.
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* @val: somewhere to pass back the value read
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**/
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static int adis16201_spi_read_reg_16(struct iio_dev *indio_dev,
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u8 lower_reg_address,
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u16 *val)
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{
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struct spi_message msg;
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struct adis16201_state *st = iio_priv(indio_dev);
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int ret;
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struct spi_transfer xfers[] = {
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{
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.tx_buf = st->tx,
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.bits_per_word = 8,
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.len = 2,
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.cs_change = 1,
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.delay_usecs = 20,
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}, {
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.rx_buf = st->rx,
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.bits_per_word = 8,
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.len = 2,
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.delay_usecs = 20,
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},
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};
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mutex_lock(&st->buf_lock);
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st->tx[0] = ADIS16201_READ_REG(lower_reg_address);
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st->tx[1] = 0;
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spi_message_init(&msg);
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spi_message_add_tail(&xfers[0], &msg);
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spi_message_add_tail(&xfers[1], &msg);
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ret = spi_sync(st->us, &msg);
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if (ret) {
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dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
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lower_reg_address);
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goto error_ret;
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}
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*val = (st->rx[0] << 8) | st->rx[1];
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error_ret:
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mutex_unlock(&st->buf_lock);
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return ret;
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}
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static int adis16201_reset(struct iio_dev *indio_dev)
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{
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int ret;
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struct adis16201_state *st = iio_priv(indio_dev);
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ret = adis16201_spi_write_reg_8(indio_dev,
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ADIS16201_GLOB_CMD,
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ADIS16201_GLOB_CMD_SW_RESET);
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if (ret)
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dev_err(&st->us->dev, "problem resetting device");
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return ret;
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}
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static ssize_t adis16201_write_reset(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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int ret;
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bool res;
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if (len < 1)
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return -EINVAL;
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ret = strtobool(buf, &res);
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if (ret || !res)
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return ret;
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return adis16201_reset(dev_get_drvdata(dev));
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}
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int adis16201_set_irq(struct iio_dev *indio_dev, bool enable)
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{
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int ret = 0;
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u16 msc;
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ret = adis16201_spi_read_reg_16(indio_dev, ADIS16201_MSC_CTRL, &msc);
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if (ret)
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goto error_ret;
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msc |= ADIS16201_MSC_CTRL_ACTIVE_HIGH;
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msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_DIO1;
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if (enable)
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msc |= ADIS16201_MSC_CTRL_DATA_RDY_EN;
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else
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msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_EN;
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ret = adis16201_spi_write_reg_16(indio_dev, ADIS16201_MSC_CTRL, msc);
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error_ret:
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return ret;
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}
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static int adis16201_check_status(struct iio_dev *indio_dev)
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{
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u16 status;
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int ret;
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ret = adis16201_spi_read_reg_16(indio_dev,
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ADIS16201_DIAG_STAT, &status);
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if (ret < 0) {
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dev_err(&indio_dev->dev, "Reading status failed\n");
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goto error_ret;
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}
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ret = status & 0xF;
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if (ret)
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ret = -EFAULT;
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if (status & ADIS16201_DIAG_STAT_SPI_FAIL)
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dev_err(&indio_dev->dev, "SPI failure\n");
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if (status & ADIS16201_DIAG_STAT_FLASH_UPT)
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dev_err(&indio_dev->dev, "Flash update failed\n");
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if (status & ADIS16201_DIAG_STAT_POWER_HIGH)
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dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
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if (status & ADIS16201_DIAG_STAT_POWER_LOW)
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dev_err(&indio_dev->dev, "Power supply below 3.15V\n");
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error_ret:
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return ret;
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}
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static int adis16201_self_test(struct iio_dev *indio_dev)
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{
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int ret;
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ret = adis16201_spi_write_reg_16(indio_dev,
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ADIS16201_MSC_CTRL,
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ADIS16201_MSC_CTRL_SELF_TEST_EN);
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if (ret) {
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dev_err(&indio_dev->dev, "problem starting self test");
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goto err_ret;
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}
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ret = adis16201_check_status(indio_dev);
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err_ret:
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return ret;
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}
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static int adis16201_initial_setup(struct iio_dev *indio_dev)
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{
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int ret;
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struct device *dev = &indio_dev->dev;
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/* Disable IRQ */
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ret = adis16201_set_irq(indio_dev, false);
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if (ret) {
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dev_err(dev, "disable irq failed");
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goto err_ret;
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}
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/* Do self test */
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ret = adis16201_self_test(indio_dev);
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if (ret) {
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dev_err(dev, "self test failure");
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goto err_ret;
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}
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/* Read status register to check the result */
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ret = adis16201_check_status(indio_dev);
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if (ret) {
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adis16201_reset(indio_dev);
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dev_err(dev, "device not playing ball -> reset");
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msleep(ADIS16201_STARTUP_DELAY);
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ret = adis16201_check_status(indio_dev);
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if (ret) {
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dev_err(dev, "giving up");
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goto err_ret;
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}
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}
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err_ret:
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return ret;
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}
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static u8 adis16201_addresses[7][2] = {
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[in_supply] = { ADIS16201_SUPPLY_OUT, },
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[temp] = { ADIS16201_TEMP_OUT },
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[accel_x] = { ADIS16201_XACCL_OUT, ADIS16201_XACCL_OFFS },
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[accel_y] = { ADIS16201_YACCL_OUT, ADIS16201_YACCL_OFFS },
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[in_aux] = { ADIS16201_AUX_ADC },
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[incli_x] = { ADIS16201_XINCL_OUT },
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[incli_y] = { ADIS16201_YINCL_OUT },
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};
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static int adis16201_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2,
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long mask)
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{
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int ret;
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int bits;
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u8 addr;
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s16 val16;
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switch (mask) {
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case 0:
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mutex_lock(&indio_dev->mlock);
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addr = adis16201_addresses[chan->address][0];
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ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16);
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if (ret) {
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mutex_unlock(&indio_dev->mlock);
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return ret;
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}
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if (val16 & ADIS16201_ERROR_ACTIVE) {
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ret = adis16201_check_status(indio_dev);
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if (ret) {
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mutex_unlock(&indio_dev->mlock);
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return ret;
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}
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}
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val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
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if (chan->scan_type.sign == 's')
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val16 = (s16)(val16 <<
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(16 - chan->scan_type.realbits)) >>
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(16 - chan->scan_type.realbits);
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*val = val16;
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mutex_unlock(&indio_dev->mlock);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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switch (chan->type) {
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case IIO_VOLTAGE:
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*val = 0;
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if (chan->channel == 0)
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*val2 = 1220;
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else
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*val2 = 610;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_TEMP:
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*val = 0;
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*val2 = -470000;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_ACCEL:
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*val = 0;
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*val2 = 462500;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_INCLI:
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*val = 0;
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*val2 = 100000;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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break;
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case IIO_CHAN_INFO_OFFSET:
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*val = 25;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_CALIBBIAS:
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switch (chan->type) {
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case IIO_ACCEL:
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bits = 12;
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break;
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case IIO_INCLI:
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bits = 9;
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break;
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default:
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return -EINVAL;
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};
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mutex_lock(&indio_dev->mlock);
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addr = adis16201_addresses[chan->address][1];
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ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16);
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if (ret) {
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mutex_unlock(&indio_dev->mlock);
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return ret;
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}
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val16 &= (1 << bits) - 1;
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val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
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*val = val16;
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mutex_unlock(&indio_dev->mlock);
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return IIO_VAL_INT;
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}
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return -EINVAL;
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}
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static int adis16201_write_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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int bits;
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s16 val16;
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u8 addr;
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switch (mask) {
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case IIO_CHAN_INFO_CALIBBIAS:
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switch (chan->type) {
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case IIO_ACCEL:
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bits = 12;
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break;
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case IIO_INCLI:
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bits = 9;
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break;
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default:
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return -EINVAL;
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};
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val16 = val & ((1 << bits) - 1);
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addr = adis16201_addresses[chan->address][1];
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return adis16201_spi_write_reg_16(indio_dev, addr, val16);
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}
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return -EINVAL;
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}
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static struct iio_chan_spec adis16201_channels[] = {
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IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, "supply", 0, 0,
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IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
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in_supply, ADIS16201_SCAN_SUPPLY,
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IIO_ST('u', 12, 16, 0), 0),
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IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
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IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
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IIO_CHAN_INFO_OFFSET_SEPARATE_BIT,
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temp, ADIS16201_SCAN_TEMP,
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IIO_ST('u', 12, 16, 0), 0),
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IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
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IIO_CHAN_INFO_SCALE_SHARED_BIT |
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IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
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accel_x, ADIS16201_SCAN_ACC_X,
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IIO_ST('s', 14, 16, 0), 0),
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IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
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IIO_CHAN_INFO_SCALE_SHARED_BIT |
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IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
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accel_y, ADIS16201_SCAN_ACC_Y,
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IIO_ST('s', 14, 16, 0), 0),
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IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 1, 0,
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IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
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in_aux, ADIS16201_SCAN_AUX_ADC,
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IIO_ST('u', 12, 16, 0), 0),
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IIO_CHAN(IIO_INCLI, 1, 0, 0, NULL, 0, IIO_MOD_X,
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IIO_CHAN_INFO_SCALE_SHARED_BIT |
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IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
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incli_x, ADIS16201_SCAN_INCLI_X,
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IIO_ST('s', 14, 16, 0), 0),
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IIO_CHAN(IIO_INCLI, 1, 0, 0, NULL, 0, IIO_MOD_Y,
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IIO_CHAN_INFO_SCALE_SHARED_BIT |
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IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
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incli_y, ADIS16201_SCAN_INCLI_Y,
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IIO_ST('s', 14, 16, 0), 0),
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IIO_CHAN_SOFT_TIMESTAMP(7)
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};
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static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16201_write_reset, 0);
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static struct attribute *adis16201_attributes[] = {
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&iio_dev_attr_reset.dev_attr.attr,
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NULL
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};
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static const struct attribute_group adis16201_attribute_group = {
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.attrs = adis16201_attributes,
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};
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static const struct iio_info adis16201_info = {
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.attrs = &adis16201_attribute_group,
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.read_raw = &adis16201_read_raw,
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.write_raw = &adis16201_write_raw,
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.driver_module = THIS_MODULE,
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};
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static int __devinit adis16201_probe(struct spi_device *spi)
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{
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int ret;
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struct adis16201_state *st;
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struct iio_dev *indio_dev;
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/* setup the industrialio driver allocated elements */
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indio_dev = iio_allocate_device(sizeof(*st));
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if (indio_dev == NULL) {
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ret = -ENOMEM;
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goto error_ret;
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}
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st = iio_priv(indio_dev);
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/* this is only used for removal purposes */
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spi_set_drvdata(spi, indio_dev);
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st->us = spi;
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mutex_init(&st->buf_lock);
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indio_dev->name = spi->dev.driver->name;
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indio_dev->dev.parent = &spi->dev;
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indio_dev->info = &adis16201_info;
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indio_dev->channels = adis16201_channels;
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indio_dev->num_channels = ARRAY_SIZE(adis16201_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = adis16201_configure_ring(indio_dev);
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if (ret)
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goto error_free_dev;
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ret = iio_buffer_register(indio_dev,
|
|
adis16201_channels,
|
|
ARRAY_SIZE(adis16201_channels));
|
|
if (ret) {
|
|
printk(KERN_ERR "failed to initialize the ring\n");
|
|
goto error_unreg_ring_funcs;
|
|
}
|
|
|
|
if (spi->irq) {
|
|
ret = adis16201_probe_trigger(indio_dev);
|
|
if (ret)
|
|
goto error_uninitialize_ring;
|
|
}
|
|
|
|
/* Get the device into a sane initial state */
|
|
ret = adis16201_initial_setup(indio_dev);
|
|
if (ret)
|
|
goto error_remove_trigger;
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret < 0)
|
|
goto error_remove_trigger;
|
|
return 0;
|
|
|
|
error_remove_trigger:
|
|
adis16201_remove_trigger(indio_dev);
|
|
error_uninitialize_ring:
|
|
iio_buffer_unregister(indio_dev);
|
|
error_unreg_ring_funcs:
|
|
adis16201_unconfigure_ring(indio_dev);
|
|
error_free_dev:
|
|
iio_free_device(indio_dev);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static int adis16201_remove(struct spi_device *spi)
|
|
{
|
|
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
adis16201_remove_trigger(indio_dev);
|
|
iio_buffer_unregister(indio_dev);
|
|
adis16201_unconfigure_ring(indio_dev);
|
|
iio_free_device(indio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct spi_driver adis16201_driver = {
|
|
.driver = {
|
|
.name = "adis16201",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = adis16201_probe,
|
|
.remove = __devexit_p(adis16201_remove),
|
|
};
|
|
module_spi_driver(adis16201_driver);
|
|
|
|
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
|
|
MODULE_DESCRIPTION("Analog Devices ADIS16201 Programmable Digital Vibration Sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("spi:adis16201");
|