LXR linux/drivers/staging/iio/accel/adis16204

   1/*
   2 * ADIS16204 Programmable High-g Digital Impact Sensor and Recorder
   3 *
   4 * Copyright 2010 Analog Devices Inc.
   5 *
   6 * Licensed under the GPL-2 or later.
   7 */
   8
   9#include <linux/interrupt.h>
  10#include <linux/irq.h>
  11#include <linux/delay.h>
  12#include <linux/mutex.h>
  13#include <linux/device.h>
  14#include <linux/kernel.h>
  15#include <linux/spi/spi.h>
  16#include <linux/slab.h>
  17#include <linux/sysfs.h>
  18#include <linux/list.h>
  19#include <linux/module.h>
  20
  21#include <linux/iio/iio.h>
  22#include <linux/iio/sysfs.h>
  23#include <linux/iio/buffer.h>
  24#include <linux/iio/imu/adis.h>
  25
  26#include "adis16204.h"
  27
  28/* Unique to this driver currently */
  29
  30static const u8 adis16204_addresses[][2] = {
  31        [ADIS16204_SCAN_ACC_X] = { ADIS16204_XACCL_NULL, ADIS16204_X_PEAK_OUT },
  32        [ADIS16204_SCAN_ACC_Y] = { ADIS16204_YACCL_NULL, ADIS16204_Y_PEAK_OUT },
  33        [ADIS16204_SCAN_ACC_XY] = { 0, ADIS16204_XY_PEAK_OUT },
  34};
  35
  36static int adis16204_read_raw(struct iio_dev *indio_dev,
  37                              struct iio_chan_spec const *chan,
  38                              int *val, int *val2,
  39                              long mask)
  40{
  41        struct adis *st = iio_priv(indio_dev);
  42        int ret;
  43        int bits;
  44        u8 addr;
  45        s16 val16;
  46        int addrind;
  47
  48        switch (mask) {
  49        case IIO_CHAN_INFO_RAW:
  50                return adis_single_conversion(indio_dev, chan,
  51                                ADIS16204_ERROR_ACTIVE, val);
  52        case IIO_CHAN_INFO_SCALE:
  53                switch (chan->type) {
  54                case IIO_VOLTAGE:
  55                        if (chan->channel == 0) {
  56                                *val = 1;
  57                                *val2 = 220000; /* 1.22 mV */
  58                        } else {
  59                                *val = 0;
  60                                *val2 = 610000; /* 0.61 mV */
  61                        }
  62                        return IIO_VAL_INT_PLUS_MICRO;
  63                case IIO_TEMP:
  64                        *val = -470; /* 0.47 C */
  65                        *val2 = 0;
  66                        return IIO_VAL_INT_PLUS_MICRO;
  67                case IIO_ACCEL:
  68                        *val = 0;
  69                        switch (chan->channel2) {
  70                        case IIO_MOD_X:
  71                        case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
  72                                *val2 = IIO_G_TO_M_S_2(17125); /* 17.125 mg */
  73                                break;
  74                        case IIO_MOD_Y:
  75                        case IIO_MOD_Z:
  76                                *val2 = IIO_G_TO_M_S_2(8407); /* 8.407 mg */
  77                                break;
  78                        }
  79                        return IIO_VAL_INT_PLUS_MICRO;
  80                default:
  81                        return -EINVAL;
  82                }
  83                break;
  84        case IIO_CHAN_INFO_OFFSET:
  85                *val = 25000 / -470 - 1278; /* 25 C = 1278 */
  86                return IIO_VAL_INT;
  87        case IIO_CHAN_INFO_CALIBBIAS:
  88        case IIO_CHAN_INFO_PEAK:
  89                if (mask == IIO_CHAN_INFO_CALIBBIAS) {
  90                        bits = 12;
  91                        addrind = 0;
  92                } else { /* PEAK_SEPARATE */
  93                        bits = 14;
  94                        addrind = 1;
  95                }
  96                mutex_lock(&indio_dev->mlock);
  97                addr = adis16204_addresses[chan->scan_index][addrind];
  98                ret = adis_read_reg_16(st, addr, &val16);
  99                if (ret) {
 100                        mutex_unlock(&indio_dev->mlock);
 101                        return ret;
 102                }
 103                val16 &= (1 << bits) - 1;
 104                val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
 105                *val = val16;
 106                mutex_unlock(&indio_dev->mlock);
 107                return IIO_VAL_INT;
 108        }
 109        return -EINVAL;
 110}
 111
 112static int adis16204_write_raw(struct iio_dev *indio_dev,
 113                               struct iio_chan_spec const *chan,
 114                               int val,
 115                               int val2,
 116                               long mask)
 117{
 118        struct adis *st = iio_priv(indio_dev);
 119        int bits;
 120        s16 val16;
 121        u8 addr;
 122
 123        switch (mask) {
 124        case IIO_CHAN_INFO_CALIBBIAS:
 125                switch (chan->type) {
 126                case IIO_ACCEL:
 127                        bits = 12;
 128                        break;
 129                default:
 130                        return -EINVAL;
 131                }
 132                val16 = val & ((1 << bits) - 1);
 133                addr = adis16204_addresses[chan->scan_index][1];
 134                return adis_write_reg_16(st, addr, val16);
 135        }
 136        return -EINVAL;
 137}
 138
 139static const struct iio_chan_spec adis16204_channels[] = {
 140        ADIS_SUPPLY_CHAN(ADIS16204_SUPPLY_OUT, ADIS16204_SCAN_SUPPLY, 0, 12),
 141        ADIS_AUX_ADC_CHAN(ADIS16204_AUX_ADC, ADIS16204_SCAN_AUX_ADC, 0, 12),
 142        ADIS_TEMP_CHAN(ADIS16204_TEMP_OUT, ADIS16204_SCAN_TEMP, 0, 12),
 143        ADIS_ACCEL_CHAN(X, ADIS16204_XACCL_OUT, ADIS16204_SCAN_ACC_X,
 144                        BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK),
 145                        0, 14),
 146        ADIS_ACCEL_CHAN(Y, ADIS16204_YACCL_OUT, ADIS16204_SCAN_ACC_Y,
 147                        BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK),
 148                        0, 14),
 149        ADIS_ACCEL_CHAN(ROOT_SUM_SQUARED_X_Y, ADIS16204_XY_RSS_OUT,
 150                        ADIS16204_SCAN_ACC_XY, BIT(IIO_CHAN_INFO_PEAK), 0, 14),
 151        IIO_CHAN_SOFT_TIMESTAMP(5),
 152};
 153
 154static const struct iio_info adis16204_info = {
 155        .read_raw = &adis16204_read_raw,
 156        .write_raw = &adis16204_write_raw,
 157        .update_scan_mode = adis_update_scan_mode,
 158        .driver_module = THIS_MODULE,
 159};
 160
 161static const char * const adis16204_status_error_msgs[] = {
 162        [ADIS16204_DIAG_STAT_SELFTEST_FAIL_BIT] = "Self test failure",
 163        [ADIS16204_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
 164        [ADIS16204_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
 165        [ADIS16204_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
 166        [ADIS16204_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 2.975V",
 167};
 168
 169static const struct adis_data adis16204_data = {
 170        .read_delay = 20,
 171        .msc_ctrl_reg = ADIS16204_MSC_CTRL,
 172        .glob_cmd_reg = ADIS16204_GLOB_CMD,
 173        .diag_stat_reg = ADIS16204_DIAG_STAT,
 174
 175        .self_test_mask = ADIS16204_MSC_CTRL_SELF_TEST_EN,
 176        .startup_delay = ADIS16204_STARTUP_DELAY,
 177
 178        .status_error_msgs = adis16204_status_error_msgs,
 179        .status_error_mask = BIT(ADIS16204_DIAG_STAT_SELFTEST_FAIL_BIT) |
 180                BIT(ADIS16204_DIAG_STAT_SPI_FAIL_BIT) |
 181                BIT(ADIS16204_DIAG_STAT_FLASH_UPT_BIT) |
 182                BIT(ADIS16204_DIAG_STAT_POWER_HIGH_BIT) |
 183                BIT(ADIS16204_DIAG_STAT_POWER_LOW_BIT),
 184};
 185
 186static int adis16204_probe(struct spi_device *spi)
 187{
 188        int ret;
 189        struct adis *st;
 190        struct iio_dev *indio_dev;
 191
 192        /* setup the industrialio driver allocated elements */
 193        indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 194        if (!indio_dev)
 195                return -ENOMEM;
 196        st = iio_priv(indio_dev);
 197        /* this is only used for removal purposes */
 198        spi_set_drvdata(spi, indio_dev);
 199
 200        indio_dev->name = spi->dev.driver->name;
 201        indio_dev->dev.parent = &spi->dev;
 202        indio_dev->info = &adis16204_info;
 203        indio_dev->channels = adis16204_channels;
 204        indio_dev->num_channels = ARRAY_SIZE(adis16204_channels);
 205        indio_dev->modes = INDIO_DIRECT_MODE;
 206
 207        ret = adis_init(st, indio_dev, spi, &adis16204_data);
 208        if (ret)
 209                return ret;
 210
 211        ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL);
 212        if (ret)
 213                return ret;
 214
 215        /* Get the device into a sane initial state */
 216        ret = adis_initial_startup(st);
 217        if (ret)
 218                goto error_cleanup_buffer_trigger;
 219        ret = iio_device_register(indio_dev);
 220        if (ret)
 221                goto error_cleanup_buffer_trigger;
 222
 223        return 0;
 224
 225error_cleanup_buffer_trigger:
 226        adis_cleanup_buffer_and_trigger(st, indio_dev);
 227        return ret;
 228}
 229
 230static int adis16204_remove(struct spi_device *spi)
 231{
 232        struct iio_dev *indio_dev = spi_get_drvdata(spi);
 233        struct adis *st = iio_priv(indio_dev);
 234
 235        iio_device_unregister(indio_dev);
 236        adis_cleanup_buffer_and_trigger(st, indio_dev);
 237
 238        return 0;
 239}
 240
 241static struct spi_driver adis16204_driver = {
 242        .driver = {
 243                .name = "adis16204",
 244        },
 245        .probe = adis16204_probe,
 246        .remove = adis16204_remove,
 247};
 248module_spi_driver(adis16204_driver);
 249
 250MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 251MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
 252MODULE_LICENSE("GPL v2");
 253MODULE_ALIAS("spi:adis16204");
 254