322 lines
8.6 KiB
C
322 lines
8.6 KiB
C
/*
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* ADIS16201 Dual-Axis Digital Inclinometer and Accelerometer
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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/device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/sysfs.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/imu/adis.h>
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#define ADIS16201_STARTUP_DELAY_MS 220
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#define ADIS16201_FLASH_CNT 0x00
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/* Data Output Register Information */
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#define ADIS16201_SUPPLY_OUT_REG 0x02
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#define ADIS16201_XACCL_OUT_REG 0x04
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#define ADIS16201_YACCL_OUT_REG 0x06
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#define ADIS16201_AUX_ADC_REG 0x08
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#define ADIS16201_TEMP_OUT_REG 0x0A
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#define ADIS16201_XINCL_OUT_REG 0x0C
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#define ADIS16201_YINCL_OUT_REG 0x0E
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/* Calibration Register Definition */
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#define ADIS16201_XACCL_OFFS_REG 0x10
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#define ADIS16201_YACCL_OFFS_REG 0x12
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#define ADIS16201_XACCL_SCALE_REG 0x14
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#define ADIS16201_YACCL_SCALE_REG 0x16
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#define ADIS16201_XINCL_OFFS_REG 0x18
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#define ADIS16201_YINCL_OFFS_REG 0x1A
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#define ADIS16201_XINCL_SCALE_REG 0x1C
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#define ADIS16201_YINCL_SCALE_REG 0x1E
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/* Alarm Register Definition */
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#define ADIS16201_ALM_MAG1_REG 0x20
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#define ADIS16201_ALM_MAG2_REG 0x22
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#define ADIS16201_ALM_SMPL1_REG 0x24
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#define ADIS16201_ALM_SMPL2_REG 0x26
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#define ADIS16201_ALM_CTRL_REG 0x28
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#define ADIS16201_AUX_DAC_REG 0x30
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#define ADIS16201_GPIO_CTRL_REG 0x32
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#define ADIS16201_SMPL_PRD_REG 0x36
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/* Operation, filter configuration */
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#define ADIS16201_AVG_CNT_REG 0x38
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#define ADIS16201_SLP_CNT_REG 0x3A
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/* Miscellaneous Control Register Definition */
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#define ADIS16201_MSC_CTRL_REG 0x34
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#define ADIS16201_MSC_CTRL_SELF_TEST_EN BIT(8)
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/* Data-ready enable: 1 = enabled, 0 = disabled */
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#define ADIS16201_MSC_CTRL_DATA_RDY_EN BIT(2)
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/* Data-ready polarity: 1 = active high, 0 = active low */
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#define ADIS16201_MSC_CTRL_ACTIVE_DATA_RDY_HIGH BIT(1)
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/* Data-ready line selection: 1 = DIO1, 0 = DIO0 */
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#define ADIS16201_MSC_CTRL_DATA_RDY_DIO1 BIT(0)
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/* Diagnostics System Status Register Definition */
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#define ADIS16201_DIAG_STAT_REG 0x3C
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#define ADIS16201_DIAG_STAT_ALARM2 BIT(9)
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#define ADIS16201_DIAG_STAT_ALARM1 BIT(8)
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#define ADIS16201_DIAG_STAT_SPI_FAIL_BIT 3
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#define ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT 2
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/* Power supply above 3.625 V */
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#define ADIS16201_DIAG_STAT_POWER_HIGH_BIT 1
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/* Power supply below 3.15 V */
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#define ADIS16201_DIAG_STAT_POWER_LOW_BIT 0
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/* System Command Register Definition */
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#define ADIS16201_GLOB_CMD_REG 0x3E
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#define ADIS16201_GLOB_CMD_SW_RESET BIT(7)
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#define ADIS16201_GLOB_CMD_FACTORY_RESET BIT(1)
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#define ADIS16201_ERROR_ACTIVE BIT(14)
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enum adis16201_scan {
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ADIS16201_SCAN_ACC_X,
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ADIS16201_SCAN_ACC_Y,
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ADIS16201_SCAN_INCLI_X,
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ADIS16201_SCAN_INCLI_Y,
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ADIS16201_SCAN_SUPPLY,
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ADIS16201_SCAN_AUX_ADC,
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ADIS16201_SCAN_TEMP,
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};
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static const u8 adis16201_addresses[] = {
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[ADIS16201_SCAN_ACC_X] = ADIS16201_XACCL_OFFS_REG,
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[ADIS16201_SCAN_ACC_Y] = ADIS16201_YACCL_OFFS_REG,
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[ADIS16201_SCAN_INCLI_X] = ADIS16201_XINCL_OFFS_REG,
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[ADIS16201_SCAN_INCLI_Y] = ADIS16201_YINCL_OFFS_REG,
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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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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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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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ADIS16201_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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/* Voltage base units are mV hence 1.22 mV */
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*val = 1;
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*val2 = 220000;
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} else {
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/* Voltage base units are mV hence 0.61 mV */
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*val = 0;
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*val2 = 610000;
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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;
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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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/*
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* IIO base unit for sensitivity of accelerometer
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* is milli g.
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* 1 LSB represents 0.244 mg.
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*/
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*val = 0;
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*val2 = IIO_G_TO_M_S_2(462400);
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return IIO_VAL_INT_PLUS_NANO;
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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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/*
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* The raw ADC value is 1278 when the temperature
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* is 25 degrees and the scale factor per milli
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* degree celcius is -470.
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*/
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*val = 25000 / -470 - 1278;
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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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addr = adis16201_addresses[chan->scan_index];
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ret = adis_read_reg_16(st, addr, &val16);
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if (ret)
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return ret;
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*val = sign_extend32(val16, bits - 1);
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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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struct adis *st = iio_priv(indio_dev);
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int m;
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if (mask != IIO_CHAN_INFO_CALIBBIAS)
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return -EINVAL;
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switch (chan->type) {
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case IIO_ACCEL:
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m = GENMASK(11, 0);
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break;
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case IIO_INCLI:
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m = GENMASK(8, 0);
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break;
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default:
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return -EINVAL;
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}
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return adis_write_reg_16(st, adis16201_addresses[chan->scan_index],
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val & m);
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}
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static const struct iio_chan_spec adis16201_channels[] = {
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ADIS_SUPPLY_CHAN(ADIS16201_SUPPLY_OUT_REG, ADIS16201_SCAN_SUPPLY, 0,
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12),
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ADIS_TEMP_CHAN(ADIS16201_TEMP_OUT_REG, ADIS16201_SCAN_TEMP, 0, 12),
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ADIS_ACCEL_CHAN(X, ADIS16201_XACCL_OUT_REG, ADIS16201_SCAN_ACC_X,
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BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
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ADIS_ACCEL_CHAN(Y, ADIS16201_YACCL_OUT_REG, ADIS16201_SCAN_ACC_Y,
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BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
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ADIS_AUX_ADC_CHAN(ADIS16201_AUX_ADC_REG, ADIS16201_SCAN_AUX_ADC, 0, 12),
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ADIS_INCLI_CHAN(X, ADIS16201_XINCL_OUT_REG, ADIS16201_SCAN_INCLI_X,
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BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
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ADIS_INCLI_CHAN(X, ADIS16201_YINCL_OUT_REG, ADIS16201_SCAN_INCLI_Y,
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BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
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IIO_CHAN_SOFT_TIMESTAMP(7)
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};
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static const struct iio_info adis16201_info = {
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.read_raw = adis16201_read_raw,
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.write_raw = adis16201_write_raw,
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.update_scan_mode = adis_update_scan_mode,
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};
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static const char * const adis16201_status_error_msgs[] = {
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[ADIS16201_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
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[ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT] = "Flash update failed",
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[ADIS16201_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
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[ADIS16201_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 3.15V",
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};
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static const struct adis_data adis16201_data = {
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.read_delay = 20,
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.msc_ctrl_reg = ADIS16201_MSC_CTRL_REG,
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.glob_cmd_reg = ADIS16201_GLOB_CMD_REG,
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.diag_stat_reg = ADIS16201_DIAG_STAT_REG,
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.self_test_mask = ADIS16201_MSC_CTRL_SELF_TEST_EN,
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.self_test_no_autoclear = true,
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.startup_delay = ADIS16201_STARTUP_DELAY_MS,
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.status_error_msgs = adis16201_status_error_msgs,
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.status_error_mask = BIT(ADIS16201_DIAG_STAT_SPI_FAIL_BIT) |
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BIT(ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT) |
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BIT(ADIS16201_DIAG_STAT_POWER_HIGH_BIT) |
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BIT(ADIS16201_DIAG_STAT_POWER_LOW_BIT),
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};
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static int adis16201_probe(struct spi_device *spi)
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{
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struct iio_dev *indio_dev;
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struct adis *st;
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int ret;
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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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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 = &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 = adis_init(st, indio_dev, spi, &adis16201_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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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 < 0)
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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 adis16201_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 adis16201_driver = {
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.driver = {
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.name = "adis16201",
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},
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.probe = adis16201_probe,
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.remove = adis16201_remove,
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};
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module_spi_driver(adis16201_driver);
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MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
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MODULE_DESCRIPTION("Analog Devices ADIS16201 Dual-Axis Digital Inclinometer and Accelerometer");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("spi:adis16201");
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