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
  48         switch (mask) {
  49         case IIO_CHAN_INFO_CALIBBIAS:
  50                 switch (chan->type) {
  51                 case IIO_ACCEL:
  52                 case IIO_INCLI:
  53                         bits = 14;
  54                         break;
  55                 default:
  56                         return -EINVAL;
  57                 }
  58                 val16 = val & ((1 << bits) - 1);
  59                 addr = adis16209_addresses[chan->scan_index][0];
  60                 return adis_write_reg_16(st, addr, val16);
  61         }
  62         return -EINVAL;
  63 }
  64
  65 static int adis16209_read_raw(struct iio_dev *indio_dev,
  66                               struct iio_chan_spec const *chan,
  67                               int *val, int *val2,
  68                               long mask)
  69 {
  70         struct adis *st = iio_priv(indio_dev);
  71         int ret;
  72         int bits;
  73         u8 addr;
  74         s16 val16;
  75
  76         switch (mask) {
  77         case IIO_CHAN_INFO_RAW:
  78                 return adis_single_conversion(indio_dev, chan,
  79                         ADIS16209_ERROR_ACTIVE, val);
  80         case IIO_CHAN_INFO_SCALE:
  81                 switch (chan->type) {
  82                 case IIO_VOLTAGE:
  83                         *val = 0;
  84                         if (chan->channel == 0)
  85                                 *val2 = 305180; /* 0.30518 mV */
  86                         else
  87                                 *val2 = 610500; /* 0.6105 mV */
  88                         return IIO_VAL_INT_PLUS_MICRO;
  89                 case IIO_TEMP:
  90                         *val = -470; /* -0.47 C */
  91                         *val2 = 0;
  92                         return IIO_VAL_INT_PLUS_MICRO;
  93                 case IIO_ACCEL:
  94                         *val = 0;
  95                         *val2 = IIO_G_TO_M_S_2(244140); /* 0.244140 mg */
  96                         return IIO_VAL_INT_PLUS_NANO;
  97                 case IIO_INCLI:
  98                 case IIO_ROT:
  99                         *val = 0;
 100                         *val2 = 25000; /* 0.025 degree */
 101                         return IIO_VAL_INT_PLUS_MICRO;
 102                 default:
 103                         return -EINVAL;
 104                 }
 105                 break;
 106         case IIO_CHAN_INFO_OFFSET:
 107                 *val = 25000 / -470 - 0x4FE; /* 25 C = 0x4FE */
 108                 return IIO_VAL_INT;
 109         case IIO_CHAN_INFO_CALIBBIAS:
 110                 switch (chan->type) {
 111                 case IIO_ACCEL:
 112                         bits = 14;
 113                         break;
 114                 default:
 115                         return -EINVAL;
 116                 }
 117                 mutex_lock(&indio_dev->mlock);
 118                 addr = adis16209_addresses[chan->scan_index][0];
 119                 ret = adis_read_reg_16(st, addr, &val16);
 120                 if (ret) {
 121                         mutex_unlock(&indio_dev->mlock);
 122                         return ret;
 123                 }
 124                 val16 &= (1 << bits) - 1;
 125                 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
 126                 *val = val16;
 127                 mutex_unlock(&indio_dev->mlock);
 128                 return IIO_VAL_INT;
 129         }
 130         return -EINVAL;
 131 }
 132
 133 static const struct iio_chan_spec adis16209_channels[] = {
 134         ADIS_SUPPLY_CHAN(ADIS16209_SUPPLY_OUT, ADIS16209_SCAN_SUPPLY, 0, 14),
 135         ADIS_TEMP_CHAN(ADIS16209_TEMP_OUT, ADIS16209_SCAN_TEMP, 0, 12),
 136         ADIS_ACCEL_CHAN(X, ADIS16209_XACCL_OUT, ADIS16209_SCAN_ACC_X,
 137                         BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
 138         ADIS_ACCEL_CHAN(Y, ADIS16209_YACCL_OUT, ADIS16209_SCAN_ACC_Y,
 139                         BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
 140         ADIS_AUX_ADC_CHAN(ADIS16209_AUX_ADC, ADIS16209_SCAN_AUX_ADC, 0, 12),
 141         ADIS_INCLI_CHAN(X, ADIS16209_XINCL_OUT, ADIS16209_SCAN_INCLI_X,
 142                         0, 0, 14),
 143         ADIS_INCLI_CHAN(Y, ADIS16209_YINCL_OUT, ADIS16209_SCAN_INCLI_Y,
 144                         0, 0, 14),
 145         ADIS_ROT_CHAN(X, ADIS16209_ROT_OUT, ADIS16209_SCAN_ROT, 0, 0, 14),
 146         IIO_CHAN_SOFT_TIMESTAMP(8)
 147 };
 148
 149 static const struct iio_info adis16209_info = {
 150         .read_raw = &adis16209_read_raw,
 151         .write_raw = &adis16209_write_raw,
 152         .update_scan_mode = adis_update_scan_mode,
 153         .driver_module = THIS_MODULE,
 154 };
 155
 156 static const char * const adis16209_status_error_msgs[] = {
 157         [ADIS16209_DIAG_STAT_SELFTEST_FAIL_BIT] = "Self test failure",
 158         [ADIS16209_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
 159         [ADIS16209_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
 160         [ADIS16209_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
 161         [ADIS16209_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 3.15V",
 162 };
 163
 164 static const struct adis_data adis16209_data = {
 165         .read_delay = 30,
 166         .msc_ctrl_reg = ADIS16209_MSC_CTRL,
 167         .glob_cmd_reg = ADIS16209_GLOB_CMD,
 168         .diag_stat_reg = ADIS16209_DIAG_STAT,
 169
 170         .self_test_mask = ADIS16209_MSC_CTRL_SELF_TEST_EN,
 171         .startup_delay = ADIS16209_STARTUP_DELAY,
 172
 173         .status_error_msgs = adis16209_status_error_msgs,
 174         .status_error_mask = BIT(ADIS16209_DIAG_STAT_SELFTEST_FAIL_BIT) |
 175                 BIT(ADIS16209_DIAG_STAT_SPI_FAIL_BIT) |
 176                 BIT(ADIS16209_DIAG_STAT_FLASH_UPT_BIT) |
 177                 BIT(ADIS16209_DIAG_STAT_POWER_HIGH_BIT) |
 178                 BIT(ADIS16209_DIAG_STAT_POWER_LOW_BIT),
 179 };
 180
 181 static int adis16209_probe(struct spi_device *spi)
 182 {
 183         int ret;
 184         struct adis *st;
 185         struct iio_dev *indio_dev;
 186
 187         /* setup the industrialio driver allocated elements */
 188         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 189         if (!indio_dev)
 190                 return -ENOMEM;
 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                 return ret;
 205         ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL);
 206         if (ret)
 207                 return ret;
 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         return ret;
 222 }
 223
 224 static int adis16209_remove(struct spi_device *spi)
 225 {
 226         struct iio_dev *indio_dev = spi_get_drvdata(spi);
 227         struct adis *st = iio_priv(indio_dev);
 228
 229         iio_device_unregister(indio_dev);
 230         adis_cleanup_buffer_and_trigger(st, indio_dev);
 231
 232         return 0;
 233 }
 234
 235 static struct spi_driver adis16209_driver = {
 236         .driver = {
 237                 .name = "adis16209",
 238         },
 239         .probe = adis16209_probe,
 240         .remove = adis16209_remove,
 241 };
 242 module_spi_driver(adis16209_driver);
 243
 244 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 245 MODULE_DESCRIPTION("Analog Devices ADIS16209 Digital Vibration Sensor driver");
 246 MODULE_LICENSE("GPL v2");
 247 MODULE_ALIAS("spi:adis16209");