drivers/staging/iio/accel/adis16204_core.c

   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
  30 static 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
  36 static 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
 112 static 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         switch (mask) {
 123         case IIO_CHAN_INFO_CALIBBIAS:
 124                 switch (chan->type) {
 125                 case IIO_ACCEL:
 126                         bits = 12;
 127                         break;
 128                 default:
 129                         return -EINVAL;
 130                 }
 131                 val16 = val & ((1 << bits) - 1);
 132                 addr = adis16204_addresses[chan->scan_index][1];
 133                 return adis_write_reg_16(st, addr, val16);
 134         }
 135         return -EINVAL;
 136 }
 137
 138 static const struct iio_chan_spec adis16204_channels[] = {
 139         ADIS_SUPPLY_CHAN(ADIS16204_SUPPLY_OUT, ADIS16204_SCAN_SUPPLY, 12),
 140         ADIS_AUX_ADC_CHAN(ADIS16204_AUX_ADC, ADIS16204_SCAN_AUX_ADC, 12),
 141         ADIS_TEMP_CHAN(ADIS16204_TEMP_OUT, ADIS16204_SCAN_TEMP, 12),
 142         ADIS_ACCEL_CHAN(X, ADIS16204_XACCL_OUT, ADIS16204_SCAN_ACC_X,
 143                 BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK), 14),
 144         ADIS_ACCEL_CHAN(Y, ADIS16204_YACCL_OUT, ADIS16204_SCAN_ACC_Y,
 145                 BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK), 14),
 146         ADIS_ACCEL_CHAN(ROOT_SUM_SQUARED_X_Y, ADIS16204_XY_RSS_OUT,
 147                 ADIS16204_SCAN_ACC_XY, BIT(IIO_CHAN_INFO_PEAK), 14),
 148         IIO_CHAN_SOFT_TIMESTAMP(5),
 149 };
 150
 151 static const struct iio_info adis16204_info = {
 152         .read_raw = &adis16204_read_raw,
 153         .write_raw = &adis16204_write_raw,
 154         .update_scan_mode = adis_update_scan_mode,
 155         .driver_module = THIS_MODULE,
 156 };
 157
 158 static const char * const adis16204_status_error_msgs[] = {
 159         [ADIS16204_DIAG_STAT_SELFTEST_FAIL_BIT] = "Self test failure",
 160         [ADIS16204_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
 161         [ADIS16204_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
 162         [ADIS16204_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
 163         [ADIS16204_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 2.975V",
 164 };
 165
 166 static const struct adis_data adis16204_data = {
 167         .read_delay = 20,
 168         .msc_ctrl_reg = ADIS16204_MSC_CTRL,
 169         .glob_cmd_reg = ADIS16204_GLOB_CMD,
 170         .diag_stat_reg = ADIS16204_DIAG_STAT,
 171
 172         .self_test_mask = ADIS16204_MSC_CTRL_SELF_TEST_EN,
 173         .startup_delay = ADIS16204_STARTUP_DELAY,
 174
 175         .status_error_msgs = adis16204_status_error_msgs,
 176         .status_error_mask = BIT(ADIS16204_DIAG_STAT_SELFTEST_FAIL_BIT) |
 177                 BIT(ADIS16204_DIAG_STAT_SPI_FAIL_BIT) |
 178                 BIT(ADIS16204_DIAG_STAT_FLASH_UPT_BIT) |
 179                 BIT(ADIS16204_DIAG_STAT_POWER_HIGH_BIT) |
 180                 BIT(ADIS16204_DIAG_STAT_POWER_LOW_BIT),
 181 };
 182
 183 static int adis16204_probe(struct spi_device *spi)
 184 {
 185         int ret;
 186         struct adis *st;
 187         struct iio_dev *indio_dev;
 188
 189         /* setup the industrialio driver allocated elements */
 190         indio_dev = iio_device_alloc(sizeof(*st));
 191         if (indio_dev == NULL) {
 192                 ret = -ENOMEM;
 193                 goto error_ret;
 194         }
 195         st = iio_priv(indio_dev);
 196         /* this is only used for removal purposes */
 197         spi_set_drvdata(spi, indio_dev);
 198
 199         indio_dev->name = spi->dev.driver->name;
 200         indio_dev->dev.parent = &spi->dev;
 201         indio_dev->info = &adis16204_info;
 202         indio_dev->channels = adis16204_channels;
 203         indio_dev->num_channels = ARRAY_SIZE(adis16204_channels);
 204         indio_dev->modes = INDIO_DIRECT_MODE;
 205
 206         ret = adis_init(st, indio_dev, spi, &adis16204_data);
 207         if (ret)
 208                 goto error_free_dev;
 209
 210         ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL);
 211         if (ret)
 212                 goto error_free_dev;
 213
 214         /* Get the device into a sane initial state */
 215         ret = adis_initial_startup(st);
 216         if (ret)
 217                 goto error_cleanup_buffer_trigger;
 218         ret = iio_device_register(indio_dev);
 219         if (ret)
 220                 goto error_cleanup_buffer_trigger;
 221
 222         return 0;
 223
 224 error_cleanup_buffer_trigger:
 225         adis_cleanup_buffer_and_trigger(st, indio_dev);
 226 error_free_dev:
 227         iio_device_free(indio_dev);
 228 error_ret:
 229         return ret;
 230 }
 231
 232 static int adis16204_remove(struct spi_device *spi)
 233 {
 234         struct iio_dev *indio_dev = spi_get_drvdata(spi);
 235         struct adis *st = iio_priv(indio_dev);
 236
 237         iio_device_unregister(indio_dev);
 238         adis_cleanup_buffer_and_trigger(st, indio_dev);
 239         iio_device_free(indio_dev);
 240
 241         return 0;
 242 }
 243
 244 static struct spi_driver adis16204_driver = {
 245         .driver = {
 246                 .name = "adis16204",
 247                 .owner = THIS_MODULE,
 248         },
 249         .probe = adis16204_probe,
 250         .remove = adis16204_remove,
 251 };
 252 module_spi_driver(adis16204_driver);
 253
 254 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 255 MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
 256 MODULE_LICENSE("GPL v2");
 257 MODULE_ALIAS("spi:adis16204");