drivers/staging/iio/accel/adis16203_core.c

   1 /*
   2  * ADIS16203 Programmable Digital Vibration Sensor driver
   3  *
   4  * Copyright 2030 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 "adis16203.h"
  24
  25 #define DRIVER_NAME             "adis16203"
  26
  27 static const u8 adis16203_addresses[] = {
  28         [ADIS16203_SCAN_INCLI_X] = ADIS16203_INCL_NULL,
  29 };
  30
  31 static int adis16203_write_raw(struct iio_dev *indio_dev,
  32                                struct iio_chan_spec const *chan,
  33                                int val,
  34                                int val2,
  35                                long mask)
  36 {
  37         struct adis *st = iio_priv(indio_dev);
  38         /* currently only one writable parameter which keeps this simple */
  39         u8 addr = adis16203_addresses[chan->scan_index];
  40         return adis_write_reg_16(st, addr, val & 0x3FFF);
  41 }
  42
  43 static int adis16203_read_raw(struct iio_dev *indio_dev,
  44                               struct iio_chan_spec const *chan,
  45                               int *val, int *val2,
  46                               long mask)
  47 {
  48         struct adis *st = iio_priv(indio_dev);
  49         int ret;
  50         int bits;
  51         u8 addr;
  52         s16 val16;
  53         switch (mask) {
  54         case IIO_CHAN_INFO_RAW:
  55                 return adis_single_conversion(indio_dev, chan,
  56                                 ADIS16203_ERROR_ACTIVE, val);
  57         case IIO_CHAN_INFO_SCALE:
  58                 switch (chan->type) {
  59                 case IIO_VOLTAGE:
  60                         if (chan->channel == 0) {
  61                                 *val = 1;
  62                                 *val2 = 220000; /* 1.22 mV */
  63                         } else {
  64                                 *val = 0;
  65                                 *val2 = 610000; /* 0.61 mV */
  66                         }
  67                         return IIO_VAL_INT_PLUS_MICRO;
  68                 case IIO_TEMP:
  69                         *val = -470; /* -0.47 C */
  70                         *val2 = 0;
  71                         return IIO_VAL_INT_PLUS_MICRO;
  72                 case IIO_INCLI:
  73                         *val = 0;
  74                         *val2 = 25000; /* 0.025 degree */
  75                         return IIO_VAL_INT_PLUS_MICRO;
  76                 default:
  77                         return -EINVAL;
  78                 }
  79         case IIO_CHAN_INFO_OFFSET:
  80                 *val = 25000 / -470 - 1278; /* 25 C = 1278 */
  81                 return IIO_VAL_INT;
  82         case IIO_CHAN_INFO_CALIBBIAS:
  83                 bits = 14;
  84                 mutex_lock(&indio_dev->mlock);
  85                 addr = adis16203_addresses[chan->scan_index];
  86                 ret = adis_read_reg_16(st, addr, &val16);
  87                 if (ret) {
  88                         mutex_unlock(&indio_dev->mlock);
  89                         return ret;
  90                 }
  91                 val16 &= (1 << bits) - 1;
  92                 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
  93                 *val = val16;
  94                 mutex_unlock(&indio_dev->mlock);
  95                 return IIO_VAL_INT;
  96         default:
  97                 return -EINVAL;
  98         }
  99 }
 100
 101 static const struct iio_chan_spec adis16203_channels[] = {
 102         ADIS_SUPPLY_CHAN(ADIS16203_SUPPLY_OUT, ADIS16203_SCAN_SUPPLY, 12),
 103         ADIS_AUX_ADC_CHAN(ADIS16203_AUX_ADC, ADIS16203_SCAN_AUX_ADC, 12),
 104         ADIS_INCLI_CHAN(X, ADIS16203_XINCL_OUT, ADIS16203_SCAN_INCLI_X,
 105                 BIT(IIO_CHAN_INFO_CALIBBIAS), 14),
 106         /* Fixme: Not what it appears to be - see data sheet */
 107         ADIS_INCLI_CHAN(Y, ADIS16203_YINCL_OUT, ADIS16203_SCAN_INCLI_Y, 0, 14),
 108         ADIS_TEMP_CHAN(ADIS16203_TEMP_OUT, ADIS16203_SCAN_TEMP, 12),
 109         IIO_CHAN_SOFT_TIMESTAMP(5),
 110 };
 111
 112 static const struct iio_info adis16203_info = {
 113         .read_raw = &adis16203_read_raw,
 114         .write_raw = &adis16203_write_raw,
 115         .update_scan_mode = adis_update_scan_mode,
 116         .driver_module = THIS_MODULE,
 117 };
 118
 119 static const char * const adis16203_status_error_msgs[] = {
 120         [ADIS16203_DIAG_STAT_SELFTEST_FAIL_BIT] = "Self test failure",
 121         [ADIS16203_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
 122         [ADIS16203_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
 123         [ADIS16203_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
 124         [ADIS16203_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 3.15V",
 125 };
 126
 127 static const struct adis_data adis16203_data = {
 128         .read_delay = 20,
 129         .msc_ctrl_reg = ADIS16203_MSC_CTRL,
 130         .glob_cmd_reg = ADIS16203_GLOB_CMD,
 131         .diag_stat_reg = ADIS16203_DIAG_STAT,
 132
 133         .self_test_mask = ADIS16203_MSC_CTRL_SELF_TEST_EN,
 134         .startup_delay = ADIS16203_STARTUP_DELAY,
 135
 136         .status_error_msgs = adis16203_status_error_msgs,
 137         .status_error_mask = BIT(ADIS16203_DIAG_STAT_SELFTEST_FAIL_BIT) |
 138                 BIT(ADIS16203_DIAG_STAT_SPI_FAIL_BIT) |
 139                 BIT(ADIS16203_DIAG_STAT_FLASH_UPT_BIT) |
 140                 BIT(ADIS16203_DIAG_STAT_POWER_HIGH_BIT) |
 141                 BIT(ADIS16203_DIAG_STAT_POWER_LOW_BIT),
 142 };
 143
 144 static int adis16203_probe(struct spi_device *spi)
 145 {
 146         int ret;
 147         struct iio_dev *indio_dev;
 148         struct adis *st;
 149
 150         /* setup the industrialio driver allocated elements */
 151         indio_dev = iio_device_alloc(sizeof(*st));
 152         if (indio_dev == NULL) {
 153                 ret = -ENOMEM;
 154                 goto error_ret;
 155         }
 156         st = iio_priv(indio_dev);
 157         /* this is only used for removal purposes */
 158         spi_set_drvdata(spi, indio_dev);
 159
 160         indio_dev->name = spi->dev.driver->name;
 161         indio_dev->dev.parent = &spi->dev;
 162         indio_dev->channels = adis16203_channels;
 163         indio_dev->num_channels = ARRAY_SIZE(adis16203_channels);
 164         indio_dev->info = &adis16203_info;
 165         indio_dev->modes = INDIO_DIRECT_MODE;
 166
 167         ret = adis_init(st, indio_dev, spi, &adis16203_data);
 168         if (ret)
 169                 goto error_free_dev;
 170
 171         ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL);
 172         if (ret)
 173                 goto error_free_dev;
 174
 175         /* Get the device into a sane initial state */
 176         ret = adis_initial_startup(st);
 177         if (ret)
 178                 goto error_cleanup_buffer_trigger;
 179
 180         ret = iio_device_register(indio_dev);
 181         if (ret)
 182                 goto error_cleanup_buffer_trigger;
 183
 184         return 0;
 185
 186 error_cleanup_buffer_trigger:
 187         adis_cleanup_buffer_and_trigger(st, indio_dev);
 188 error_free_dev:
 189         iio_device_free(indio_dev);
 190 error_ret:
 191         return ret;
 192 }
 193
 194 static int adis16203_remove(struct spi_device *spi)
 195 {
 196         struct iio_dev *indio_dev = spi_get_drvdata(spi);
 197         struct adis *st = iio_priv(indio_dev);
 198
 199         iio_device_unregister(indio_dev);
 200         adis_cleanup_buffer_and_trigger(st, indio_dev);
 201         iio_device_free(indio_dev);
 202
 203         return 0;
 204 }
 205
 206 static struct spi_driver adis16203_driver = {
 207         .driver = {
 208                 .name = "adis16203",
 209                 .owner = THIS_MODULE,
 210         },
 211         .probe = adis16203_probe,
 212         .remove = adis16203_remove,
 213 };
 214 module_spi_driver(adis16203_driver);
 215
 216 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 217 MODULE_DESCRIPTION("Analog Devices ADIS16203 Programmable Digital Vibration Sensor driver");
 218 MODULE_LICENSE("GPL v2");
 219 MODULE_ALIAS("spi:adis16203");