254 lines
6.6 KiB
C
254 lines
6.6 KiB
C
/*
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* ADIS16204 Programmable High-g Digital Impact Sensor and Recorder
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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/interrupt.h>
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#include <linux/irq.h>
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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/list.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/buffer.h>
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#include <linux/iio/imu/adis.h>
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#include "adis16204.h"
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/* Unique to this driver currently */
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static const u8 adis16204_addresses[][2] = {
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[ADIS16204_SCAN_ACC_X] = { ADIS16204_XACCL_NULL, ADIS16204_X_PEAK_OUT },
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[ADIS16204_SCAN_ACC_Y] = { ADIS16204_YACCL_NULL, ADIS16204_Y_PEAK_OUT },
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[ADIS16204_SCAN_ACC_XY] = { 0, ADIS16204_XY_PEAK_OUT },
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};
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static int adis16204_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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struct adis *st = iio_priv(indio_dev);
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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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int addrind;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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return adis_single_conversion(indio_dev, chan,
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ADIS16204_ERROR_ACTIVE, val);
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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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if (chan->channel == 0) {
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*val = 1;
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*val2 = 220000; /* 1.22 mV */
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} else {
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*val = 0;
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*val2 = 610000; /* 0.61 mV */
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}
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_TEMP:
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*val = -470; /* 0.47 C */
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*val2 = 0;
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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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switch (chan->channel2) {
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case IIO_MOD_X:
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case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
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*val2 = IIO_G_TO_M_S_2(17125); /* 17.125 mg */
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break;
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case IIO_MOD_Y:
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case IIO_MOD_Z:
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*val2 = IIO_G_TO_M_S_2(8407); /* 8.407 mg */
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break;
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}
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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 = 25000 / -470 - 1278; /* 25 C = 1278 */
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_CALIBBIAS:
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case IIO_CHAN_INFO_PEAK:
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if (mask == IIO_CHAN_INFO_CALIBBIAS) {
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bits = 12;
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addrind = 0;
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} else { /* PEAK_SEPARATE */
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bits = 14;
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addrind = 1;
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}
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mutex_lock(&indio_dev->mlock);
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addr = adis16204_addresses[chan->scan_index][addrind];
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ret = adis_read_reg_16(st, 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 adis16204_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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struct adis *st = iio_priv(indio_dev);
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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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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 = adis16204_addresses[chan->scan_index][1];
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return adis_write_reg_16(st, addr, val16);
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}
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return -EINVAL;
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}
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static const struct iio_chan_spec adis16204_channels[] = {
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ADIS_SUPPLY_CHAN(ADIS16204_SUPPLY_OUT, ADIS16204_SCAN_SUPPLY, 0, 12),
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ADIS_AUX_ADC_CHAN(ADIS16204_AUX_ADC, ADIS16204_SCAN_AUX_ADC, 0, 12),
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ADIS_TEMP_CHAN(ADIS16204_TEMP_OUT, ADIS16204_SCAN_TEMP, 0, 12),
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ADIS_ACCEL_CHAN(X, ADIS16204_XACCL_OUT, ADIS16204_SCAN_ACC_X,
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BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK),
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0, 14),
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ADIS_ACCEL_CHAN(Y, ADIS16204_YACCL_OUT, ADIS16204_SCAN_ACC_Y,
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BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK),
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0, 14),
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ADIS_ACCEL_CHAN(ROOT_SUM_SQUARED_X_Y, ADIS16204_XY_RSS_OUT,
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ADIS16204_SCAN_ACC_XY, BIT(IIO_CHAN_INFO_PEAK), 0, 14),
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IIO_CHAN_SOFT_TIMESTAMP(5),
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};
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static const struct iio_info adis16204_info = {
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.read_raw = &adis16204_read_raw,
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.write_raw = &adis16204_write_raw,
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.update_scan_mode = adis_update_scan_mode,
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.driver_module = THIS_MODULE,
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};
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static const char * const adis16204_status_error_msgs[] = {
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[ADIS16204_DIAG_STAT_SELFTEST_FAIL_BIT] = "Self test failure",
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[ADIS16204_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
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[ADIS16204_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
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[ADIS16204_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
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[ADIS16204_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 2.975V",
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};
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static const struct adis_data adis16204_data = {
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.read_delay = 20,
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.msc_ctrl_reg = ADIS16204_MSC_CTRL,
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.glob_cmd_reg = ADIS16204_GLOB_CMD,
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.diag_stat_reg = ADIS16204_DIAG_STAT,
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.self_test_mask = ADIS16204_MSC_CTRL_SELF_TEST_EN,
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.startup_delay = ADIS16204_STARTUP_DELAY,
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.status_error_msgs = adis16204_status_error_msgs,
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.status_error_mask = BIT(ADIS16204_DIAG_STAT_SELFTEST_FAIL_BIT) |
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BIT(ADIS16204_DIAG_STAT_SPI_FAIL_BIT) |
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BIT(ADIS16204_DIAG_STAT_FLASH_UPT_BIT) |
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BIT(ADIS16204_DIAG_STAT_POWER_HIGH_BIT) |
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BIT(ADIS16204_DIAG_STAT_POWER_LOW_BIT),
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};
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static int adis16204_probe(struct spi_device *spi)
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{
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int ret;
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struct adis *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 = devm_iio_device_alloc(&spi->dev, sizeof(*st));
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if (!indio_dev)
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return -ENOMEM;
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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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indio_dev->name = spi->dev.driver->name;
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indio_dev->dev.parent = &spi->dev;
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indio_dev->info = &adis16204_info;
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indio_dev->channels = adis16204_channels;
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indio_dev->num_channels = ARRAY_SIZE(adis16204_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = adis_init(st, indio_dev, spi, &adis16204_data);
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if (ret)
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return ret;
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ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL);
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if (ret)
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return ret;
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/* Get the device into a sane initial state */
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ret = adis_initial_startup(st);
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if (ret)
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goto error_cleanup_buffer_trigger;
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ret = iio_device_register(indio_dev);
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if (ret)
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goto error_cleanup_buffer_trigger;
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return 0;
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error_cleanup_buffer_trigger:
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adis_cleanup_buffer_and_trigger(st, indio_dev);
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return ret;
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}
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static int adis16204_remove(struct spi_device *spi)
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{
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struct iio_dev *indio_dev = spi_get_drvdata(spi);
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struct adis *st = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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adis_cleanup_buffer_and_trigger(st, indio_dev);
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return 0;
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}
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static struct spi_driver adis16204_driver = {
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.driver = {
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.name = "adis16204",
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},
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.probe = adis16204_probe,
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.remove = adis16204_remove,
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};
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module_spi_driver(adis16204_driver);
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MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
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MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("spi:adis16204");
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