drivers/iio/magnetometer/st_magn_core.c

   1 /*
   2  * STMicroelectronics magnetometers driver
   3  *
   4  * Copyright 2012-2013 STMicroelectronics Inc.
   5  *
   6  * Denis Ciocca <denis.ciocca@st.com>
   7  *
   8  * Licensed under the GPL-2.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/errno.h>
  15 #include <linux/types.h>
  16 #include <linux/mutex.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/i2c.h>
  19 #include <linux/gpio.h>
  20 #include <linux/irq.h>
  21 #include <linux/delay.h>
  22 #include <linux/iio/iio.h>
  23 #include <linux/iio/sysfs.h>
  24 #include <linux/iio/buffer.h>
  25
  26 #include <linux/iio/common/st_sensors.h>
  27 #include "st_magn.h"
  28
  29 #define ST_MAGN_NUMBER_DATA_CHANNELS            3
  30
  31 /* DEFAULT VALUE FOR SENSORS */
  32 #define ST_MAGN_DEFAULT_OUT_X_H_ADDR            0X03
  33 #define ST_MAGN_DEFAULT_OUT_Y_H_ADDR            0X07
  34 #define ST_MAGN_DEFAULT_OUT_Z_H_ADDR            0X05
  35
  36 /* FULLSCALE */
  37 #define ST_MAGN_FS_AVL_1300MG                   1300
  38 #define ST_MAGN_FS_AVL_1900MG                   1900
  39 #define ST_MAGN_FS_AVL_2500MG                   2500
  40 #define ST_MAGN_FS_AVL_4000MG                   4000
  41 #define ST_MAGN_FS_AVL_4700MG                   4700
  42 #define ST_MAGN_FS_AVL_5600MG                   5600
  43 #define ST_MAGN_FS_AVL_8000MG                   8000
  44 #define ST_MAGN_FS_AVL_8100MG                   8100
  45 #define ST_MAGN_FS_AVL_10000MG                  10000
  46
  47 /* CUSTOM VALUES FOR SENSOR 1 */
  48 #define ST_MAGN_1_WAI_EXP                       0x3c
  49 #define ST_MAGN_1_ODR_ADDR                      0x00
  50 #define ST_MAGN_1_ODR_MASK                      0x1c
  51 #define ST_MAGN_1_ODR_AVL_1HZ_VAL               0x00
  52 #define ST_MAGN_1_ODR_AVL_2HZ_VAL               0x01
  53 #define ST_MAGN_1_ODR_AVL_3HZ_VAL               0x02
  54 #define ST_MAGN_1_ODR_AVL_8HZ_VAL               0x03
  55 #define ST_MAGN_1_ODR_AVL_15HZ_VAL              0x04
  56 #define ST_MAGN_1_ODR_AVL_30HZ_VAL              0x05
  57 #define ST_MAGN_1_ODR_AVL_75HZ_VAL              0x06
  58 #define ST_MAGN_1_ODR_AVL_220HZ_VAL             0x07
  59 #define ST_MAGN_1_PW_ADDR                       0x02
  60 #define ST_MAGN_1_PW_MASK                       0x03
  61 #define ST_MAGN_1_PW_ON                         0x00
  62 #define ST_MAGN_1_PW_OFF                        0x03
  63 #define ST_MAGN_1_FS_ADDR                       0x01
  64 #define ST_MAGN_1_FS_MASK                       0xe0
  65 #define ST_MAGN_1_FS_AVL_1300_VAL               0x01
  66 #define ST_MAGN_1_FS_AVL_1900_VAL               0x02
  67 #define ST_MAGN_1_FS_AVL_2500_VAL               0x03
  68 #define ST_MAGN_1_FS_AVL_4000_VAL               0x04
  69 #define ST_MAGN_1_FS_AVL_4700_VAL               0x05
  70 #define ST_MAGN_1_FS_AVL_5600_VAL               0x06
  71 #define ST_MAGN_1_FS_AVL_8100_VAL               0x07
  72 #define ST_MAGN_1_FS_AVL_1300_GAIN_XY           1100
  73 #define ST_MAGN_1_FS_AVL_1900_GAIN_XY           855
  74 #define ST_MAGN_1_FS_AVL_2500_GAIN_XY           670
  75 #define ST_MAGN_1_FS_AVL_4000_GAIN_XY           450
  76 #define ST_MAGN_1_FS_AVL_4700_GAIN_XY           400
  77 #define ST_MAGN_1_FS_AVL_5600_GAIN_XY           330
  78 #define ST_MAGN_1_FS_AVL_8100_GAIN_XY           230
  79 #define ST_MAGN_1_FS_AVL_1300_GAIN_Z            980
  80 #define ST_MAGN_1_FS_AVL_1900_GAIN_Z            760
  81 #define ST_MAGN_1_FS_AVL_2500_GAIN_Z            600
  82 #define ST_MAGN_1_FS_AVL_4000_GAIN_Z            400
  83 #define ST_MAGN_1_FS_AVL_4700_GAIN_Z            355
  84 #define ST_MAGN_1_FS_AVL_5600_GAIN_Z            295
  85 #define ST_MAGN_1_FS_AVL_8100_GAIN_Z            205
  86 #define ST_MAGN_1_MULTIREAD_BIT                 false
  87
  88 /* CUSTOM VALUES FOR SENSOR 2 */
  89 #define ST_MAGN_2_WAI_EXP                       0x3d
  90 #define ST_MAGN_2_ODR_ADDR                      0x20
  91 #define ST_MAGN_2_ODR_MASK                      0x1c
  92 #define ST_MAGN_2_ODR_AVL_1HZ_VAL               0x00
  93 #define ST_MAGN_2_ODR_AVL_2HZ_VAL               0x01
  94 #define ST_MAGN_2_ODR_AVL_3HZ_VAL               0x02
  95 #define ST_MAGN_2_ODR_AVL_5HZ_VAL               0x03
  96 #define ST_MAGN_2_ODR_AVL_10HZ_VAL              0x04
  97 #define ST_MAGN_2_ODR_AVL_20HZ_VAL              0x05
  98 #define ST_MAGN_2_ODR_AVL_40HZ_VAL              0x06
  99 #define ST_MAGN_2_ODR_AVL_80HZ_VAL              0x07
 100 #define ST_MAGN_2_PW_ADDR                       0x22
 101 #define ST_MAGN_2_PW_MASK                       0x03
 102 #define ST_MAGN_2_PW_ON                         0x00
 103 #define ST_MAGN_2_PW_OFF                        0x03
 104 #define ST_MAGN_2_FS_ADDR                       0x21
 105 #define ST_MAGN_2_FS_MASK                       0x60
 106 #define ST_MAGN_2_FS_AVL_4000_VAL               0x00
 107 #define ST_MAGN_2_FS_AVL_8000_VAL               0x01
 108 #define ST_MAGN_2_FS_AVL_10000_VAL              0x02
 109 #define ST_MAGN_2_FS_AVL_4000_GAIN              430
 110 #define ST_MAGN_2_FS_AVL_8000_GAIN              230
 111 #define ST_MAGN_2_FS_AVL_10000_GAIN             230
 112 #define ST_MAGN_2_MULTIREAD_BIT                 false
 113 #define ST_MAGN_2_OUT_X_L_ADDR                  0x28
 114 #define ST_MAGN_2_OUT_Y_L_ADDR                  0x2a
 115 #define ST_MAGN_2_OUT_Z_L_ADDR                  0x2c
 116
 117 static const struct iio_chan_spec st_magn_16bit_channels[] = {
 118         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
 119                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 120                         ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_BE, 16, 16,
 121                         ST_MAGN_DEFAULT_OUT_X_H_ADDR),
 122         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
 123                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 124                         ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_BE, 16, 16,
 125                         ST_MAGN_DEFAULT_OUT_Y_H_ADDR),
 126         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
 127                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 128                         ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_BE, 16, 16,
 129                         ST_MAGN_DEFAULT_OUT_Z_H_ADDR),
 130         IIO_CHAN_SOFT_TIMESTAMP(3)
 131 };
 132
 133 static const struct iio_chan_spec st_magn_2_16bit_channels[] = {
 134         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
 135                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 136                         ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16,
 137                         ST_MAGN_2_OUT_X_L_ADDR),
 138         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
 139                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 140                         ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16,
 141                         ST_MAGN_2_OUT_Y_L_ADDR),
 142         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
 143                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 144                         ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16,
 145                         ST_MAGN_2_OUT_Z_L_ADDR),
 146         IIO_CHAN_SOFT_TIMESTAMP(3)
 147 };
 148
 149 static const struct st_sensors st_magn_sensors[] = {
 150         {
 151                 .wai = ST_MAGN_1_WAI_EXP,
 152                 .sensors_supported = {
 153                         [0] = LSM303DLHC_MAGN_DEV_NAME,
 154                         [1] = LSM303DLM_MAGN_DEV_NAME,
 155                 },
 156                 .ch = (struct iio_chan_spec *)st_magn_16bit_channels,
 157                 .odr = {
 158                         .addr = ST_MAGN_1_ODR_ADDR,
 159                         .mask = ST_MAGN_1_ODR_MASK,
 160                         .odr_avl = {
 161                                 { 1, ST_MAGN_1_ODR_AVL_1HZ_VAL, },
 162                                 { 2, ST_MAGN_1_ODR_AVL_2HZ_VAL, },
 163                                 { 3, ST_MAGN_1_ODR_AVL_3HZ_VAL, },
 164                                 { 8, ST_MAGN_1_ODR_AVL_8HZ_VAL, },
 165                                 { 15, ST_MAGN_1_ODR_AVL_15HZ_VAL, },
 166                                 { 30, ST_MAGN_1_ODR_AVL_30HZ_VAL, },
 167                                 { 75, ST_MAGN_1_ODR_AVL_75HZ_VAL, },
 168                                 { 220, ST_MAGN_1_ODR_AVL_220HZ_VAL, },
 169                         },
 170                 },
 171                 .pw = {
 172                         .addr = ST_MAGN_1_PW_ADDR,
 173                         .mask = ST_MAGN_1_PW_MASK,
 174                         .value_on = ST_MAGN_1_PW_ON,
 175                         .value_off = ST_MAGN_1_PW_OFF,
 176                 },
 177                 .fs = {
 178                         .addr = ST_MAGN_1_FS_ADDR,
 179                         .mask = ST_MAGN_1_FS_MASK,
 180                         .fs_avl = {
 181                                 [0] = {
 182                                         .num = ST_MAGN_FS_AVL_1300MG,
 183                                         .value = ST_MAGN_1_FS_AVL_1300_VAL,
 184                                         .gain = ST_MAGN_1_FS_AVL_1300_GAIN_XY,
 185                                         .gain2 = ST_MAGN_1_FS_AVL_1300_GAIN_Z,
 186                                 },
 187                                 [1] = {
 188                                         .num = ST_MAGN_FS_AVL_1900MG,
 189                                         .value = ST_MAGN_1_FS_AVL_1900_VAL,
 190                                         .gain = ST_MAGN_1_FS_AVL_1900_GAIN_XY,
 191                                         .gain2 = ST_MAGN_1_FS_AVL_1900_GAIN_Z,
 192                                 },
 193                                 [2] = {
 194                                         .num = ST_MAGN_FS_AVL_2500MG,
 195                                         .value = ST_MAGN_1_FS_AVL_2500_VAL,
 196                                         .gain = ST_MAGN_1_FS_AVL_2500_GAIN_XY,
 197                                         .gain2 = ST_MAGN_1_FS_AVL_2500_GAIN_Z,
 198                                 },
 199                                 [3] = {
 200                                         .num = ST_MAGN_FS_AVL_4000MG,
 201                                         .value = ST_MAGN_1_FS_AVL_4000_VAL,
 202                                         .gain = ST_MAGN_1_FS_AVL_4000_GAIN_XY,
 203                                         .gain2 = ST_MAGN_1_FS_AVL_4000_GAIN_Z,
 204                                 },
 205                                 [4] = {
 206                                         .num = ST_MAGN_FS_AVL_4700MG,
 207                                         .value = ST_MAGN_1_FS_AVL_4700_VAL,
 208                                         .gain = ST_MAGN_1_FS_AVL_4700_GAIN_XY,
 209                                         .gain2 = ST_MAGN_1_FS_AVL_4700_GAIN_Z,
 210                                 },
 211                                 [5] = {
 212                                         .num = ST_MAGN_FS_AVL_5600MG,
 213                                         .value = ST_MAGN_1_FS_AVL_5600_VAL,
 214                                         .gain = ST_MAGN_1_FS_AVL_5600_GAIN_XY,
 215                                         .gain2 = ST_MAGN_1_FS_AVL_5600_GAIN_Z,
 216                                 },
 217                                 [6] = {
 218                                         .num = ST_MAGN_FS_AVL_8100MG,
 219                                         .value = ST_MAGN_1_FS_AVL_8100_VAL,
 220                                         .gain = ST_MAGN_1_FS_AVL_8100_GAIN_XY,
 221                                         .gain2 = ST_MAGN_1_FS_AVL_8100_GAIN_Z,
 222                                 },
 223                         },
 224                 },
 225                 .multi_read_bit = ST_MAGN_1_MULTIREAD_BIT,
 226                 .bootime = 2,
 227         },
 228         {
 229                 .wai = ST_MAGN_2_WAI_EXP,
 230                 .sensors_supported = {
 231                         [0] = LIS3MDL_MAGN_DEV_NAME,
 232                 },
 233                 .ch = (struct iio_chan_spec *)st_magn_2_16bit_channels,
 234                 .odr = {
 235                         .addr = ST_MAGN_2_ODR_ADDR,
 236                         .mask = ST_MAGN_2_ODR_MASK,
 237                         .odr_avl = {
 238                                 { 1, ST_MAGN_2_ODR_AVL_1HZ_VAL, },
 239                                 { 2, ST_MAGN_2_ODR_AVL_2HZ_VAL, },
 240                                 { 3, ST_MAGN_2_ODR_AVL_3HZ_VAL, },
 241                                 { 5, ST_MAGN_2_ODR_AVL_5HZ_VAL, },
 242                                 { 10, ST_MAGN_2_ODR_AVL_10HZ_VAL, },
 243                                 { 20, ST_MAGN_2_ODR_AVL_20HZ_VAL, },
 244                                 { 40, ST_MAGN_2_ODR_AVL_40HZ_VAL, },
 245                                 { 80, ST_MAGN_2_ODR_AVL_80HZ_VAL, },
 246                         },
 247                 },
 248                 .pw = {
 249                         .addr = ST_MAGN_2_PW_ADDR,
 250                         .mask = ST_MAGN_2_PW_MASK,
 251                         .value_on = ST_MAGN_2_PW_ON,
 252                         .value_off = ST_MAGN_2_PW_OFF,
 253                 },
 254                 .fs = {
 255                         .addr = ST_MAGN_2_FS_ADDR,
 256                         .mask = ST_MAGN_2_FS_MASK,
 257                         .fs_avl = {
 258                                 [0] = {
 259                                         .num = ST_MAGN_FS_AVL_4000MG,
 260                                         .value = ST_MAGN_2_FS_AVL_4000_VAL,
 261                                         .gain = ST_MAGN_2_FS_AVL_4000_GAIN,
 262                                 },
 263                                 [1] = {
 264                                         .num = ST_MAGN_FS_AVL_8000MG,
 265                                         .value = ST_MAGN_2_FS_AVL_8000_VAL,
 266                                         .gain = ST_MAGN_2_FS_AVL_8000_GAIN,
 267                                 },
 268                                 [2] = {
 269                                         .num = ST_MAGN_FS_AVL_10000MG,
 270                                         .value = ST_MAGN_2_FS_AVL_10000_VAL,
 271                                         .gain = ST_MAGN_2_FS_AVL_10000_GAIN,
 272                                 },
 273                         },
 274                 },
 275                 .multi_read_bit = ST_MAGN_2_MULTIREAD_BIT,
 276                 .bootime = 2,
 277         },
 278 };
 279
 280 static int st_magn_read_raw(struct iio_dev *indio_dev,
 281                         struct iio_chan_spec const *ch, int *val,
 282                                                         int *val2, long mask)
 283 {
 284         int err;
 285         struct st_sensor_data *mdata = iio_priv(indio_dev);
 286
 287         switch (mask) {
 288         case IIO_CHAN_INFO_RAW:
 289                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 290                 if (err < 0)
 291                         goto read_error;
 292
 293                 return IIO_VAL_INT;
 294         case IIO_CHAN_INFO_SCALE:
 295                 *val = 0;
 296                 if ((ch->scan_index == ST_SENSORS_SCAN_Z) &&
 297                                         (mdata->current_fullscale->gain2 != 0))
 298                         *val2 = mdata->current_fullscale->gain2;
 299                 else
 300                         *val2 = mdata->current_fullscale->gain;
 301                 return IIO_VAL_INT_PLUS_MICRO;
 302         default:
 303                 return -EINVAL;
 304         }
 305
 306 read_error:
 307         return err;
 308 }
 309
 310 static int st_magn_write_raw(struct iio_dev *indio_dev,
 311                 struct iio_chan_spec const *chan, int val, int val2, long mask)
 312 {
 313         int err;
 314
 315         switch (mask) {
 316         case IIO_CHAN_INFO_SCALE:
 317                 err = st_sensors_set_fullscale_by_gain(indio_dev, val2);
 318                 break;
 319         default:
 320                 err = -EINVAL;
 321         }
 322
 323         return err;
 324 }
 325
 326 static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
 327 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 328 static ST_SENSORS_DEV_ATTR_SCALE_AVAIL(in_magn_scale_available);
 329
 330 static struct attribute *st_magn_attributes[] = {
 331         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 332         &iio_dev_attr_in_magn_scale_available.dev_attr.attr,
 333         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 334         NULL,
 335 };
 336
 337 static const struct attribute_group st_magn_attribute_group = {
 338         .attrs = st_magn_attributes,
 339 };
 340
 341 static const struct iio_info magn_info = {
 342         .driver_module = THIS_MODULE,
 343         .attrs = &st_magn_attribute_group,
 344         .read_raw = &st_magn_read_raw,
 345         .write_raw = &st_magn_write_raw,
 346 };
 347
 348 int st_magn_common_probe(struct iio_dev *indio_dev,
 349                                         struct st_sensors_platform_data *pdata)
 350 {
 351         struct st_sensor_data *mdata = iio_priv(indio_dev);
 352         int irq = mdata->get_irq_data_ready(indio_dev);
 353         int err;
 354
 355         indio_dev->modes = INDIO_DIRECT_MODE;
 356         indio_dev->info = &magn_info;
 357
 358         err = st_sensors_check_device_support(indio_dev,
 359                                 ARRAY_SIZE(st_magn_sensors), st_magn_sensors);
 360         if (err < 0)
 361                 return err;
 362
 363         mdata->num_data_channels = ST_MAGN_NUMBER_DATA_CHANNELS;
 364         mdata->multiread_bit = mdata->sensor->multi_read_bit;
 365         indio_dev->channels = mdata->sensor->ch;
 366         indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS;
 367
 368         mdata->current_fullscale = (struct st_sensor_fullscale_avl *)
 369                                                 &mdata->sensor->fs.fs_avl[0];
 370         mdata->odr = mdata->sensor->odr.odr_avl[0].hz;
 371
 372         err = st_sensors_init_sensor(indio_dev, pdata);
 373         if (err < 0)
 374                 return err;
 375
 376         err = st_magn_allocate_ring(indio_dev);
 377         if (err < 0)
 378                 return err;
 379
 380         if (irq > 0) {
 381                 err = st_sensors_allocate_trigger(indio_dev, NULL);
 382                 if (err < 0)
 383                         goto st_magn_probe_trigger_error;
 384         }
 385
 386         err = iio_device_register(indio_dev);
 387         if (err)
 388                 goto st_magn_device_register_error;
 389
 390         return 0;
 391
 392 st_magn_device_register_error:
 393         if (irq > 0)
 394                 st_sensors_deallocate_trigger(indio_dev);
 395 st_magn_probe_trigger_error:
 396         st_magn_deallocate_ring(indio_dev);
 397
 398         return err;
 399 }
 400 EXPORT_SYMBOL(st_magn_common_probe);
 401
 402 void st_magn_common_remove(struct iio_dev *indio_dev)
 403 {
 404         struct st_sensor_data *mdata = iio_priv(indio_dev);
 405
 406         iio_device_unregister(indio_dev);
 407         if (mdata->get_irq_data_ready(indio_dev) > 0)
 408                 st_sensors_deallocate_trigger(indio_dev);
 409
 410         st_magn_deallocate_ring(indio_dev);
 411 }
 412 EXPORT_SYMBOL(st_magn_common_remove);
 413
 414 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 415 MODULE_DESCRIPTION("STMicroelectronics magnetometers driver");
 416 MODULE_LICENSE("GPL v2");