drivers/staging/iio/accel/adis16209_core.c

   1 /*
   2  * ADIS16209 Programmable Digital Vibration Sensor driver
   3  *
   4  * Copyright 2010 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/mutex.h>
  11 #include <linux/device.h>
  12 #include <linux/kernel.h>
  13 #include <linux/spi/spi.h>
  14 #include <linux/slab.h>
  15 #include <linux/sysfs.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18
  19 #include <linux/iio/iio.h>
  20 #include <linux/iio/sysfs.h>
  21 #include <linux/iio/buffer.h>
  22 #include <linux/iio/imu/adis.h>
  23
  24 #include "adis16209.h"
  25
  26 static const u8 adis16209_addresses[8][1] = {
  27         [ADIS16209_SCAN_SUPPLY] = { },
  28         [ADIS16209_SCAN_AUX_ADC] = { },
  29         [ADIS16209_SCAN_ACC_X] = { ADIS16209_XACCL_NULL },
  30         [ADIS16209_SCAN_ACC_Y] = { ADIS16209_YACCL_NULL },
  31         [ADIS16209_SCAN_INCLI_X] = { ADIS16209_XINCL_NULL },
  32         [ADIS16209_SCAN_INCLI_Y] = { ADIS16209_YINCL_NULL },
  33         [ADIS16209_SCAN_ROT] = { },
  34         [ADIS16209_SCAN_TEMP] = { },
  35 };
  36
  37 static int adis16209_write_raw(struct iio_dev *indio_dev,
  38                                struct iio_chan_spec const *chan,
  39                                int val,
  40                                int val2,
  41                                long mask)
  42 {
  43         struct adis *st = iio_priv(indio_dev);
  44         int bits;
  45         s16 val16;
  46         u8 addr;
  47         switch (mask) {
  48         case IIO_CHAN_INFO_CALIBBIAS:
  49                 switch (chan->type) {
  50                 case IIO_ACCEL:
  51                 case IIO_INCLI:
  52                         bits = 14;
  53                         break;
  54                 default:
  55                         return -EINVAL;
  56                 }
  57                 val16 = val & ((1 << bits) - 1);
  58                 addr = adis16209_addresses[chan->scan_index][0];
  59                 return adis_write_reg_16(st, addr, val16);
  60         }
  61         return -EINVAL;
  62 }
  63
  64 static int adis16209_read_raw(struct iio_dev *indio_dev,
  65                               struct iio_chan_spec const *chan,
  66                               int *val, int *val2,
  67                               long mask)
  68 {
  69         struct adis *st = iio_priv(indio_dev);
  70         int ret;
  71         int bits;
  72         u8 addr;
  73         s16 val16;
  74
  75         switch (mask) {
  76         case IIO_CHAN_INFO_RAW:
  77                 return adis_single_conversion(indio_dev, chan,
  78                         ADIS16209_ERROR_ACTIVE, val);
  79         case IIO_CHAN_INFO_SCALE:
  80                 switch (chan->type) {
  81                 case IIO_VOLTAGE:
  82                         *val = 0;
  83                         if (chan->channel == 0)
  84                                 *val2 = 305180; /* 0.30518 mV */
  85                         else
  86                                 *val2 = 610500; /* 0.6105 mV */
  87                         return IIO_VAL_INT_PLUS_MICRO;
  88                 case IIO_TEMP:
  89                         *val = -470; /* -0.47 C */
  90                         *val2 = 0;
  91                         return IIO_VAL_INT_PLUS_MICRO;
  92                 case IIO_ACCEL:
  93                         *val = 0;
  94                         *val2 = IIO_G_TO_M_S_2(244140); /* 0.244140 mg */
  95                         return IIO_VAL_INT_PLUS_NANO;
  96                 case IIO_INCLI:
  97                 case IIO_ROT:
  98                         *val = 0;
  99                         *val2 = 25000; /* 0.025 degree */
 100                         return IIO_VAL_INT_PLUS_MICRO;
 101                 default:
 102                         return -EINVAL;
 103                 }
 104                 break;
 105         case IIO_CHAN_INFO_OFFSET:
 106                 *val = 25000 / -470 - 0x4FE; /* 25 C = 0x4FE */
 107                 return IIO_VAL_INT;
 108         case IIO_CHAN_INFO_CALIBBIAS:
 109                 switch (chan->type) {
 110                 case IIO_ACCEL:
 111                         bits = 14;
 112                         break;
 113                 default:
 114                         return -EINVAL;
 115                 }
 116                 mutex_lock(&indio_dev->mlock);
 117                 addr = adis16209_addresses[chan->scan_index][0];
 118                 ret = adis_read_reg_16(st, addr, &val16);
 119                 if (ret) {
 120                         mutex_unlock(&indio_dev->mlock);
 121                         return ret;
 122                 }
 123                 val16 &= (1 << bits) - 1;
 124                 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
 125                 *val = val16;
 126                 mutex_unlock(&indio_dev->mlock);
 127                 return IIO_VAL_INT;
 128         }
 129         return -EINVAL;
 130 }
 131
 132 static const struct iio_chan_spec adis16209_channels[] = {
 133         ADIS_SUPPLY_CHAN(ADIS16209_SUPPLY_OUT, ADIS16209_SCAN_SUPPLY, 14),
 134         ADIS_TEMP_CHAN(ADIS16209_TEMP_OUT, ADIS16209_SCAN_TEMP, 12),
 135         ADIS_ACCEL_CHAN(X, ADIS16209_XACCL_OUT, ADIS16209_SCAN_ACC_X,
 136                 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT, 14),
 137         ADIS_ACCEL_CHAN(Y, ADIS16209_YACCL_OUT, ADIS16209_SCAN_ACC_Y,
 138                 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT, 14),
 139         ADIS_AUX_ADC_CHAN(ADIS16209_AUX_ADC, ADIS16209_SCAN_AUX_ADC, 12),
 140         ADIS_INCLI_CHAN(X, ADIS16209_XINCL_OUT, ADIS16209_SCAN_INCLI_X, 0, 14),
 141         ADIS_INCLI_CHAN(Y, ADIS16209_YINCL_OUT, ADIS16209_SCAN_INCLI_Y, 0, 14),
 142         ADIS_ROT_CHAN(X, ADIS16209_ROT_OUT, ADIS16209_SCAN_ROT, 0, 14),
 143         IIO_CHAN_SOFT_TIMESTAMP(8)
 144 };
 145
 146 static const struct iio_info adis16209_info = {
 147         .read_raw = &adis16209_read_raw,
 148         .write_raw = &adis16209_write_raw,
 149         .update_scan_mode = adis_update_scan_mode,
 150         .driver_module = THIS_MODULE,
 151 };
 152
 153 static const char * const adis16209_status_error_msgs[] = {
 154         [ADIS16209_DIAG_STAT_SELFTEST_FAIL_BIT] = "Self test failure",
 155         [ADIS16209_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
 156         [ADIS16209_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
 157         [ADIS16209_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
 158         [ADIS16209_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 3.15V",
 159 };
 160
 161 static const struct adis_data adis16209_data = {
 162         .read_delay = 30,
 163         .msc_ctrl_reg = ADIS16209_MSC_CTRL,
 164         .glob_cmd_reg = ADIS16209_GLOB_CMD,
 165         .diag_stat_reg = ADIS16209_DIAG_STAT,
 166
 167         .self_test_mask = ADIS16209_MSC_CTRL_SELF_TEST_EN,
 168         .startup_delay = ADIS16209_STARTUP_DELAY,
 169
 170         .status_error_msgs = adis16209_status_error_msgs,
 171         .status_error_mask = BIT(ADIS16209_DIAG_STAT_SELFTEST_FAIL_BIT) |
 172                 BIT(ADIS16209_DIAG_STAT_SPI_FAIL_BIT) |
 173                 BIT(ADIS16209_DIAG_STAT_FLASH_UPT_BIT) |
 174                 BIT(ADIS16209_DIAG_STAT_POWER_HIGH_BIT) |
 175                 BIT(ADIS16209_DIAG_STAT_POWER_LOW_BIT),
 176 };
 177
 178
 179 static int adis16209_probe(struct spi_device *spi)
 180 {
 181         int ret;
 182         struct adis *st;
 183         struct iio_dev *indio_dev;
 184
 185         /* setup the industrialio driver allocated elements */
 186         indio_dev = iio_device_alloc(sizeof(*st));
 187         if (indio_dev == NULL) {
 188                 ret = -ENOMEM;
 189                 goto error_ret;
 190         }
 191         st = iio_priv(indio_dev);
 192         /* this is only used for removal purposes */
 193         spi_set_drvdata(spi, indio_dev);
 194
 195         indio_dev->name = spi->dev.driver->name;
 196         indio_dev->dev.parent = &spi->dev;
 197         indio_dev->info = &adis16209_info;
 198         indio_dev->channels = adis16209_channels;
 199         indio_dev->num_channels = ARRAY_SIZE(adis16209_channels);
 200         indio_dev->modes = INDIO_DIRECT_MODE;
 201
 202         ret = adis_init(st, indio_dev, spi, &adis16209_data);
 203         if (ret)
 204                 goto error_free_dev;
 205         ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL);
 206         if (ret)
 207                 goto error_free_dev;
 208
 209         /* Get the device into a sane initial state */
 210         ret = adis_initial_startup(st);
 211         if (ret)
 212                 goto error_cleanup_buffer_trigger;
 213         ret = iio_device_register(indio_dev);
 214         if (ret)
 215                 goto error_cleanup_buffer_trigger;
 216
 217         return 0;
 218
 219 error_cleanup_buffer_trigger:
 220         adis_cleanup_buffer_and_trigger(st, indio_dev);
 221 error_free_dev:
 222         iio_device_free(indio_dev);
 223 error_ret:
 224         return ret;
 225 }
 226
 227 static int adis16209_remove(struct spi_device *spi)
 228 {
 229         struct iio_dev *indio_dev = spi_get_drvdata(spi);
 230         struct adis *st = iio_priv(indio_dev);
 231
 232         iio_device_unregister(indio_dev);
 233         adis_cleanup_buffer_and_trigger(st, indio_dev);
 234         iio_device_free(indio_dev);
 235
 236         return 0;
 237 }
 238
 239 static struct spi_driver adis16209_driver = {
 240         .driver = {
 241                 .name = "adis16209",
 242                 .owner = THIS_MODULE,
 243         },
 244         .probe = adis16209_probe,
 245         .remove = adis16209_remove,
 246 };
 247 module_spi_driver(adis16209_driver);
 248
 249 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 250 MODULE_DESCRIPTION("Analog Devices ADIS16209 Digital Vibration Sensor driver");
 251 MODULE_LICENSE("GPL v2");
 252 MODULE_ALIAS("spi:adis16209");