drivers/staging/iio/accel/adis16201_core.c

   1 /*
   2  * ADIS16201 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/module.h>
  17
  18 #include <linux/iio/iio.h>
  19 #include <linux/iio/sysfs.h>
  20 #include <linux/iio/buffer.h>
  21 #include <linux/iio/imu/adis.h>
  22
  23 #include "adis16201.h"
  24
  25 static const u8 adis16201_addresses[] = {
  26         [ADIS16201_SCAN_ACC_X] = ADIS16201_XACCL_OFFS,
  27         [ADIS16201_SCAN_ACC_Y] = ADIS16201_YACCL_OFFS,
  28         [ADIS16201_SCAN_INCLI_X] = ADIS16201_XINCL_OFFS,
  29         [ADIS16201_SCAN_INCLI_Y] = ADIS16201_YINCL_OFFS,
  30 };
  31
  32 static int adis16201_read_raw(struct iio_dev *indio_dev,
  33                               struct iio_chan_spec const *chan,
  34                               int *val, int *val2,
  35                               long mask)
  36 {
  37         struct adis *st = iio_priv(indio_dev);
  38         int ret;
  39         int bits;
  40         u8 addr;
  41         s16 val16;
  42
  43         switch (mask) {
  44         case IIO_CHAN_INFO_RAW:
  45                 return adis_single_conversion(indio_dev, chan,
  46                                 ADIS16201_ERROR_ACTIVE, val);
  47         case IIO_CHAN_INFO_SCALE:
  48                 switch (chan->type) {
  49                 case IIO_VOLTAGE:
  50                         if (chan->channel == 0) {
  51                                 *val = 1;
  52                                 *val2 = 220000; /* 1.22 mV */
  53                         } else {
  54                                 *val = 0;
  55                                 *val2 = 610000; /* 0.610 mV */
  56                         }
  57                         return IIO_VAL_INT_PLUS_MICRO;
  58                 case IIO_TEMP:
  59                         *val = -470; /* 0.47 C */
  60                         *val2 = 0;
  61                         return IIO_VAL_INT_PLUS_MICRO;
  62                 case IIO_ACCEL:
  63                         *val = 0;
  64                         *val2 = IIO_G_TO_M_S_2(462400); /* 0.4624 mg */
  65                         return IIO_VAL_INT_PLUS_NANO;
  66                 case IIO_INCLI:
  67                         *val = 0;
  68                         *val2 = 100000; /* 0.1 degree */
  69                         return IIO_VAL_INT_PLUS_MICRO;
  70                 default:
  71                         return -EINVAL;
  72                 }
  73                 break;
  74         case IIO_CHAN_INFO_OFFSET:
  75                 *val = 25000 / -470 - 1278; /* 25 C = 1278 */
  76                 return IIO_VAL_INT;
  77         case IIO_CHAN_INFO_CALIBBIAS:
  78                 switch (chan->type) {
  79                 case IIO_ACCEL:
  80                         bits = 12;
  81                         break;
  82                 case IIO_INCLI:
  83                         bits = 9;
  84                         break;
  85                 default:
  86                         return -EINVAL;
  87                 }
  88                 mutex_lock(&indio_dev->mlock);
  89                 addr = adis16201_addresses[chan->scan_index];
  90                 ret = adis_read_reg_16(st, addr, &val16);
  91                 if (ret) {
  92                         mutex_unlock(&indio_dev->mlock);
  93                         return ret;
  94                 }
  95                 val16 &= (1 << bits) - 1;
  96                 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
  97                 *val = val16;
  98                 mutex_unlock(&indio_dev->mlock);
  99                 return IIO_VAL_INT;
 100         }
 101         return -EINVAL;
 102 }
 103
 104 static int adis16201_write_raw(struct iio_dev *indio_dev,
 105                                struct iio_chan_spec const *chan,
 106                                int val,
 107                                int val2,
 108                                long mask)
 109 {
 110         struct adis *st = iio_priv(indio_dev);
 111         int bits;
 112         s16 val16;
 113         u8 addr;
 114
 115         switch (mask) {
 116         case IIO_CHAN_INFO_CALIBBIAS:
 117                 switch (chan->type) {
 118                 case IIO_ACCEL:
 119                         bits = 12;
 120                         break;
 121                 case IIO_INCLI:
 122                         bits = 9;
 123                         break;
 124                 default:
 125                         return -EINVAL;
 126                 }
 127                 val16 = val & ((1 << bits) - 1);
 128                 addr = adis16201_addresses[chan->scan_index];
 129                 return adis_write_reg_16(st, addr, val16);
 130         }
 131         return -EINVAL;
 132 }
 133
 134 static const struct iio_chan_spec adis16201_channels[] = {
 135         ADIS_SUPPLY_CHAN(ADIS16201_SUPPLY_OUT, ADIS16201_SCAN_SUPPLY, 0, 12),
 136         ADIS_TEMP_CHAN(ADIS16201_TEMP_OUT, ADIS16201_SCAN_TEMP, 0, 12),
 137         ADIS_ACCEL_CHAN(X, ADIS16201_XACCL_OUT, ADIS16201_SCAN_ACC_X,
 138                         BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
 139         ADIS_ACCEL_CHAN(Y, ADIS16201_YACCL_OUT, ADIS16201_SCAN_ACC_Y,
 140                         BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
 141         ADIS_AUX_ADC_CHAN(ADIS16201_AUX_ADC, ADIS16201_SCAN_AUX_ADC, 0, 12),
 142         ADIS_INCLI_CHAN(X, ADIS16201_XINCL_OUT, ADIS16201_SCAN_INCLI_X,
 143                         BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
 144         ADIS_INCLI_CHAN(X, ADIS16201_YINCL_OUT, ADIS16201_SCAN_INCLI_Y,
 145                         BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
 146         IIO_CHAN_SOFT_TIMESTAMP(7)
 147 };
 148
 149 static const struct iio_info adis16201_info = {
 150         .read_raw = &adis16201_read_raw,
 151         .write_raw = &adis16201_write_raw,
 152         .update_scan_mode = adis_update_scan_mode,
 153         .driver_module = THIS_MODULE,
 154 };
 155
 156 static const char * const adis16201_status_error_msgs[] = {
 157         [ADIS16201_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
 158         [ADIS16201_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
 159         [ADIS16201_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
 160         [ADIS16201_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 3.15V",
 161 };
 162
 163 static const struct adis_data adis16201_data = {
 164         .read_delay = 20,
 165         .msc_ctrl_reg = ADIS16201_MSC_CTRL,
 166         .glob_cmd_reg = ADIS16201_GLOB_CMD,
 167         .diag_stat_reg = ADIS16201_DIAG_STAT,
 168
 169         .self_test_mask = ADIS16201_MSC_CTRL_SELF_TEST_EN,
 170         .startup_delay = ADIS16201_STARTUP_DELAY,
 171
 172         .status_error_msgs = adis16201_status_error_msgs,
 173         .status_error_mask = BIT(ADIS16201_DIAG_STAT_SPI_FAIL_BIT) |
 174                 BIT(ADIS16201_DIAG_STAT_FLASH_UPT_BIT) |
 175                 BIT(ADIS16201_DIAG_STAT_POWER_HIGH_BIT) |
 176                 BIT(ADIS16201_DIAG_STAT_POWER_LOW_BIT),
 177 };
 178
 179 static int adis16201_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 = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 187         if (!indio_dev)
 188                 return -ENOMEM;
 189
 190         st = iio_priv(indio_dev);
 191         /* this is only used for removal purposes */
 192         spi_set_drvdata(spi, indio_dev);
 193
 194         indio_dev->name = spi->dev.driver->name;
 195         indio_dev->dev.parent = &spi->dev;
 196         indio_dev->info = &adis16201_info;
 197
 198         indio_dev->channels = adis16201_channels;
 199         indio_dev->num_channels = ARRAY_SIZE(adis16201_channels);
 200         indio_dev->modes = INDIO_DIRECT_MODE;
 201
 202         ret = adis_init(st, indio_dev, spi, &adis16201_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
 214         ret = iio_device_register(indio_dev);
 215         if (ret < 0)
 216                 goto error_cleanup_buffer_trigger;
 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 adis16201_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 adis16201_driver = {
 236         .driver = {
 237                 .name = "adis16201",
 238                 .owner = THIS_MODULE,
 239         },
 240         .probe = adis16201_probe,
 241         .remove = adis16201_remove,
 242 };
 243 module_spi_driver(adis16201_driver);
 244
 245 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 246 MODULE_DESCRIPTION("Analog Devices ADIS16201 Programmable Digital Vibration Sensor driver");
 247 MODULE_LICENSE("GPL v2");
 248 MODULE_ALIAS("spi:adis16201");