linux/drivers/staging/iio/accel/adis16240_core.c
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   1/*
   2 * ADIS16240 Programmable Impact Sensor and Recorder driver
   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/gpio.h>
  12#include <linux/delay.h>
  13#include <linux/mutex.h>
  14#include <linux/device.h>
  15#include <linux/kernel.h>
  16#include <linux/spi/spi.h>
  17#include <linux/slab.h>
  18#include <linux/sysfs.h>
  19#include <linux/list.h>
  20#include <linux/module.h>
  21
  22#include <linux/iio/iio.h>
  23#include <linux/iio/sysfs.h>
  24#include <linux/iio/buffer.h>
  25#include <linux/iio/imu/adis.h>
  26
  27#include "adis16240.h"
  28
  29static ssize_t adis16240_spi_read_signed(struct device *dev,
  30                                         struct device_attribute *attr,
  31                                         char *buf,
  32                                         unsigned bits)
  33{
  34        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
  35        struct adis *st = iio_priv(indio_dev);
  36        int ret;
  37        s16 val = 0;
  38        unsigned shift = 16 - bits;
  39        struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
  40
  41        ret = adis_read_reg_16(st,
  42                               this_attr->address, (u16 *)&val);
  43        if (ret)
  44                return ret;
  45
  46        if (val & ADIS16240_ERROR_ACTIVE)
  47                adis_check_status(st);
  48
  49        val = (s16)(val << shift) >> shift;
  50        return sprintf(buf, "%d\n", val);
  51}
  52
  53static ssize_t adis16240_read_12bit_signed(struct device *dev,
  54                                           struct device_attribute *attr,
  55                                           char *buf)
  56{
  57        ssize_t ret;
  58        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
  59
  60        /* Take the iio_dev status lock */
  61        mutex_lock(&indio_dev->mlock);
  62        ret =  adis16240_spi_read_signed(dev, attr, buf, 12);
  63        mutex_unlock(&indio_dev->mlock);
  64
  65        return ret;
  66}
  67
  68static IIO_DEVICE_ATTR(in_accel_xyz_squared_peak_raw, S_IRUGO,
  69                       adis16240_read_12bit_signed, NULL,
  70                       ADIS16240_XYZPEAK_OUT);
  71
  72static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("4096");
  73
  74static const u8 adis16240_addresses[][2] = {
  75        [ADIS16240_SCAN_ACC_X] = { ADIS16240_XACCL_OFF, ADIS16240_XPEAK_OUT },
  76        [ADIS16240_SCAN_ACC_Y] = { ADIS16240_YACCL_OFF, ADIS16240_YPEAK_OUT },
  77        [ADIS16240_SCAN_ACC_Z] = { ADIS16240_ZACCL_OFF, ADIS16240_ZPEAK_OUT },
  78};
  79
  80static int adis16240_read_raw(struct iio_dev *indio_dev,
  81                              struct iio_chan_spec const *chan,
  82                              int *val, int *val2,
  83                              long mask)
  84{
  85        struct adis *st = iio_priv(indio_dev);
  86        int ret;
  87        int bits;
  88        u8 addr;
  89        s16 val16;
  90
  91        switch (mask) {
  92        case IIO_CHAN_INFO_RAW:
  93                return adis_single_conversion(indio_dev, chan,
  94                                ADIS16240_ERROR_ACTIVE, val);
  95        case IIO_CHAN_INFO_SCALE:
  96                switch (chan->type) {
  97                case IIO_VOLTAGE:
  98                        if (chan->channel == 0) {
  99                                *val = 4;
 100                                *val2 = 880000; /* 4.88 mV */
 101                                return IIO_VAL_INT_PLUS_MICRO;
 102                        }
 103                        return -EINVAL;
 104                case IIO_TEMP:
 105                        *val = 244; /* 0.244 C */
 106                        *val2 = 0;
 107                        return IIO_VAL_INT_PLUS_MICRO;
 108                case IIO_ACCEL:
 109                        *val = 0;
 110                        *val2 = IIO_G_TO_M_S_2(51400); /* 51.4 mg */
 111                        return IIO_VAL_INT_PLUS_MICRO;
 112                default:
 113                        return -EINVAL;
 114                }
 115                break;
 116        case IIO_CHAN_INFO_PEAK_SCALE:
 117                *val = 0;
 118                *val2 = IIO_G_TO_M_S_2(51400); /* 51.4 mg */
 119                return IIO_VAL_INT_PLUS_MICRO;
 120        case IIO_CHAN_INFO_OFFSET:
 121                *val = 25000 / 244 - 0x133; /* 25 C = 0x133 */
 122                return IIO_VAL_INT;
 123        case IIO_CHAN_INFO_CALIBBIAS:
 124                bits = 10;
 125                mutex_lock(&indio_dev->mlock);
 126                addr = adis16240_addresses[chan->scan_index][0];
 127                ret = adis_read_reg_16(st, addr, &val16);
 128                if (ret) {
 129                        mutex_unlock(&indio_dev->mlock);
 130                        return ret;
 131                }
 132                val16 &= (1 << bits) - 1;
 133                val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
 134                *val = val16;
 135                mutex_unlock(&indio_dev->mlock);
 136                return IIO_VAL_INT;
 137        case IIO_CHAN_INFO_PEAK:
 138                bits = 10;
 139                mutex_lock(&indio_dev->mlock);
 140                addr = adis16240_addresses[chan->scan_index][1];
 141                ret = adis_read_reg_16(st, addr, &val16);
 142                if (ret) {
 143                        mutex_unlock(&indio_dev->mlock);
 144                        return ret;
 145                }
 146                val16 &= (1 << bits) - 1;
 147                val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
 148                *val = val16;
 149                mutex_unlock(&indio_dev->mlock);
 150                return IIO_VAL_INT;
 151        }
 152        return -EINVAL;
 153}
 154
 155static int adis16240_write_raw(struct iio_dev *indio_dev,
 156                               struct iio_chan_spec const *chan,
 157                               int val,
 158                               int val2,
 159                               long mask)
 160{
 161        struct adis *st = iio_priv(indio_dev);
 162        int bits = 10;
 163        s16 val16;
 164        u8 addr;
 165
 166        switch (mask) {
 167        case IIO_CHAN_INFO_CALIBBIAS:
 168                val16 = val & ((1 << bits) - 1);
 169                addr = adis16240_addresses[chan->scan_index][0];
 170                return adis_write_reg_16(st, addr, val16);
 171        }
 172        return -EINVAL;
 173}
 174
 175static const struct iio_chan_spec adis16240_channels[] = {
 176        ADIS_SUPPLY_CHAN(ADIS16240_SUPPLY_OUT, ADIS16240_SCAN_SUPPLY, 0, 10),
 177        ADIS_AUX_ADC_CHAN(ADIS16240_AUX_ADC, ADIS16240_SCAN_AUX_ADC, 0, 10),
 178        ADIS_ACCEL_CHAN(X, ADIS16240_XACCL_OUT, ADIS16240_SCAN_ACC_X,
 179                        BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK),
 180                        0, 10),
 181        ADIS_ACCEL_CHAN(Y, ADIS16240_YACCL_OUT, ADIS16240_SCAN_ACC_Y,
 182                        BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK),
 183                        0, 10),
 184        ADIS_ACCEL_CHAN(Z, ADIS16240_ZACCL_OUT, ADIS16240_SCAN_ACC_Z,
 185                        BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK),
 186                        0, 10),
 187        ADIS_TEMP_CHAN(ADIS16240_TEMP_OUT, ADIS16240_SCAN_TEMP, 0, 10),
 188        IIO_CHAN_SOFT_TIMESTAMP(6)
 189};
 190
 191static struct attribute *adis16240_attributes[] = {
 192        &iio_dev_attr_in_accel_xyz_squared_peak_raw.dev_attr.attr,
 193        &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 194        NULL
 195};
 196
 197static const struct attribute_group adis16240_attribute_group = {
 198        .attrs = adis16240_attributes,
 199};
 200
 201static const struct iio_info adis16240_info = {
 202        .attrs = &adis16240_attribute_group,
 203        .read_raw = &adis16240_read_raw,
 204        .write_raw = &adis16240_write_raw,
 205        .update_scan_mode = adis_update_scan_mode,
 206        .driver_module = THIS_MODULE,
 207};
 208
 209static const char * const adis16240_status_error_msgs[] = {
 210        [ADIS16240_DIAG_STAT_PWRON_FAIL_BIT] = "Power on, self-test failed",
 211        [ADIS16240_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
 212        [ADIS16240_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
 213        [ADIS16240_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
 214        [ADIS16240_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 2.225V",
 215};
 216
 217static const struct adis_data adis16240_data = {
 218        .write_delay = 35,
 219        .read_delay = 35,
 220        .msc_ctrl_reg = ADIS16240_MSC_CTRL,
 221        .glob_cmd_reg = ADIS16240_GLOB_CMD,
 222        .diag_stat_reg = ADIS16240_DIAG_STAT,
 223
 224        .self_test_mask = ADIS16240_MSC_CTRL_SELF_TEST_EN,
 225        .startup_delay = ADIS16240_STARTUP_DELAY,
 226
 227        .status_error_msgs = adis16240_status_error_msgs,
 228        .status_error_mask = BIT(ADIS16240_DIAG_STAT_PWRON_FAIL_BIT) |
 229                BIT(ADIS16240_DIAG_STAT_SPI_FAIL_BIT) |
 230                BIT(ADIS16240_DIAG_STAT_FLASH_UPT_BIT) |
 231                BIT(ADIS16240_DIAG_STAT_POWER_HIGH_BIT) |
 232                BIT(ADIS16240_DIAG_STAT_POWER_LOW_BIT),
 233};
 234
 235static int adis16240_probe(struct spi_device *spi)
 236{
 237        int ret;
 238        struct adis *st;
 239        struct iio_dev *indio_dev;
 240
 241        /* setup the industrialio driver allocated elements */
 242        indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 243        if (!indio_dev)
 244                return -ENOMEM;
 245        st = iio_priv(indio_dev);
 246        /* this is only used for removal purposes */
 247        spi_set_drvdata(spi, indio_dev);
 248
 249        indio_dev->name = spi->dev.driver->name;
 250        indio_dev->dev.parent = &spi->dev;
 251        indio_dev->info = &adis16240_info;
 252        indio_dev->channels = adis16240_channels;
 253        indio_dev->num_channels = ARRAY_SIZE(adis16240_channels);
 254        indio_dev->modes = INDIO_DIRECT_MODE;
 255
 256        ret = adis_init(st, indio_dev, spi, &adis16240_data);
 257        if (ret)
 258                return ret;
 259        ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL);
 260        if (ret)
 261                return ret;
 262
 263        /* Get the device into a sane initial state */
 264        ret = adis_initial_startup(st);
 265        if (ret)
 266                goto error_cleanup_buffer_trigger;
 267        ret = iio_device_register(indio_dev);
 268        if (ret)
 269                goto error_cleanup_buffer_trigger;
 270        return 0;
 271
 272error_cleanup_buffer_trigger:
 273        adis_cleanup_buffer_and_trigger(st, indio_dev);
 274        return ret;
 275}
 276
 277static int adis16240_remove(struct spi_device *spi)
 278{
 279        struct iio_dev *indio_dev = spi_get_drvdata(spi);
 280        struct adis *st = iio_priv(indio_dev);
 281
 282        iio_device_unregister(indio_dev);
 283        adis_cleanup_buffer_and_trigger(st, indio_dev);
 284
 285        return 0;
 286}
 287
 288static struct spi_driver adis16240_driver = {
 289        .driver = {
 290                .name = "adis16240",
 291                .owner = THIS_MODULE,
 292        },
 293        .probe = adis16240_probe,
 294        .remove = adis16240_remove,
 295};
 296module_spi_driver(adis16240_driver);
 297
 298MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 299MODULE_DESCRIPTION("Analog Devices Programmable Impact Sensor and Recorder");
 300MODULE_LICENSE("GPL v2");
 301MODULE_ALIAS("spi:adis16240");
 302
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