drivers/iio/common/st_sensors/st_sensors_core.c

   1 /*
   2  * STMicroelectronics sensors core library 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/delay.h>
  15 #include <linux/iio/iio.h>
  16 #include <asm/unaligned.h>
  17
  18 #include <linux/iio/common/st_sensors.h>
  19
  20
  21 #define ST_SENSORS_WAI_ADDRESS          0x0f
  22
  23 static int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
  24                                                 u8 reg_addr, u8 mask, u8 data)
  25 {
  26         int err;
  27         u8 new_data;
  28         struct st_sensor_data *sdata = iio_priv(indio_dev);
  29
  30         err = sdata->tf->read_byte(&sdata->tb, sdata->dev, reg_addr, &new_data);
  31         if (err < 0)
  32                 goto st_sensors_write_data_with_mask_error;
  33
  34         new_data = ((new_data & (~mask)) | ((data << __ffs(mask)) & mask));
  35         err = sdata->tf->write_byte(&sdata->tb, sdata->dev, reg_addr, new_data);
  36
  37 st_sensors_write_data_with_mask_error:
  38         return err;
  39 }
  40
  41 static int st_sensors_match_odr(struct st_sensors *sensor,
  42                         unsigned int odr, struct st_sensor_odr_avl *odr_out)
  43 {
  44         int i, ret = -EINVAL;
  45
  46         for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
  47                 if (sensor->odr.odr_avl[i].hz == 0)
  48                         goto st_sensors_match_odr_error;
  49
  50                 if (sensor->odr.odr_avl[i].hz == odr) {
  51                         odr_out->hz = sensor->odr.odr_avl[i].hz;
  52                         odr_out->value = sensor->odr.odr_avl[i].value;
  53                         ret = 0;
  54                         break;
  55                 }
  56         }
  57
  58 st_sensors_match_odr_error:
  59         return ret;
  60 }
  61
  62 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
  63 {
  64         int err;
  65         struct st_sensor_odr_avl odr_out;
  66         struct st_sensor_data *sdata = iio_priv(indio_dev);
  67
  68         err = st_sensors_match_odr(sdata->sensor, odr, &odr_out);
  69         if (err < 0)
  70                 goto st_sensors_match_odr_error;
  71
  72         if ((sdata->sensor->odr.addr == sdata->sensor->pw.addr) &&
  73                         (sdata->sensor->odr.mask == sdata->sensor->pw.mask)) {
  74                 if (sdata->enabled == true) {
  75                         err = st_sensors_write_data_with_mask(indio_dev,
  76                                 sdata->sensor->odr.addr,
  77                                 sdata->sensor->odr.mask,
  78                                 odr_out.value);
  79                 } else {
  80                         err = 0;
  81                 }
  82         } else {
  83                 err = st_sensors_write_data_with_mask(indio_dev,
  84                         sdata->sensor->odr.addr, sdata->sensor->odr.mask,
  85                         odr_out.value);
  86         }
  87         if (err >= 0)
  88                 sdata->odr = odr_out.hz;
  89
  90 st_sensors_match_odr_error:
  91         return err;
  92 }
  93 EXPORT_SYMBOL(st_sensors_set_odr);
  94
  95 static int st_sensors_match_fs(struct st_sensors *sensor,
  96                                         unsigned int fs, int *index_fs_avl)
  97 {
  98         int i, ret = -EINVAL;
  99
 100         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 101                 if (sensor->fs.fs_avl[i].num == 0)
 102                         goto st_sensors_match_odr_error;
 103
 104                 if (sensor->fs.fs_avl[i].num == fs) {
 105                         *index_fs_avl = i;
 106                         ret = 0;
 107                         break;
 108                 }
 109         }
 110
 111 st_sensors_match_odr_error:
 112         return ret;
 113 }
 114
 115 static int st_sensors_set_fullscale(struct iio_dev *indio_dev, unsigned int fs)
 116 {
 117         int err, i;
 118         struct st_sensor_data *sdata = iio_priv(indio_dev);
 119
 120         err = st_sensors_match_fs(sdata->sensor, fs, &i);
 121         if (err < 0)
 122                 goto st_accel_set_fullscale_error;
 123
 124         err = st_sensors_write_data_with_mask(indio_dev,
 125                                 sdata->sensor->fs.addr,
 126                                 sdata->sensor->fs.mask,
 127                                 sdata->sensor->fs.fs_avl[i].value);
 128         if (err < 0)
 129                 goto st_accel_set_fullscale_error;
 130
 131         sdata->current_fullscale = (struct st_sensor_fullscale_avl *)
 132                                                 &sdata->sensor->fs.fs_avl[i];
 133         return err;
 134
 135 st_accel_set_fullscale_error:
 136         dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
 137         return err;
 138 }
 139
 140 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable)
 141 {
 142         bool found;
 143         u8 tmp_value;
 144         int err = -EINVAL;
 145         struct st_sensor_odr_avl odr_out;
 146         struct st_sensor_data *sdata = iio_priv(indio_dev);
 147
 148         if (enable) {
 149                 found = false;
 150                 tmp_value = sdata->sensor->pw.value_on;
 151                 if ((sdata->sensor->odr.addr == sdata->sensor->pw.addr) &&
 152                         (sdata->sensor->odr.mask == sdata->sensor->pw.mask)) {
 153                         err = st_sensors_match_odr(sdata->sensor,
 154                                                         sdata->odr, &odr_out);
 155                         if (err < 0)
 156                                 goto set_enable_error;
 157                         tmp_value = odr_out.value;
 158                         found = true;
 159                 }
 160                 err = st_sensors_write_data_with_mask(indio_dev,
 161                                 sdata->sensor->pw.addr,
 162                                 sdata->sensor->pw.mask, tmp_value);
 163                 if (err < 0)
 164                         goto set_enable_error;
 165
 166                 sdata->enabled = true;
 167
 168                 if (found)
 169                         sdata->odr = odr_out.hz;
 170         } else {
 171                 err = st_sensors_write_data_with_mask(indio_dev,
 172                                 sdata->sensor->pw.addr,
 173                                 sdata->sensor->pw.mask,
 174                                 sdata->sensor->pw.value_off);
 175                 if (err < 0)
 176                         goto set_enable_error;
 177
 178                 sdata->enabled = false;
 179         }
 180
 181 set_enable_error:
 182         return err;
 183 }
 184 EXPORT_SYMBOL(st_sensors_set_enable);
 185
 186 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
 187 {
 188         struct st_sensor_data *sdata = iio_priv(indio_dev);
 189
 190         return st_sensors_write_data_with_mask(indio_dev,
 191                                 sdata->sensor->enable_axis.addr,
 192                                 sdata->sensor->enable_axis.mask, axis_enable);
 193 }
 194 EXPORT_SYMBOL(st_sensors_set_axis_enable);
 195
 196 int st_sensors_init_sensor(struct iio_dev *indio_dev)
 197 {
 198         int err;
 199         struct st_sensor_data *sdata = iio_priv(indio_dev);
 200
 201         mutex_init(&sdata->tb.buf_lock);
 202
 203         err = st_sensors_set_enable(indio_dev, false);
 204         if (err < 0)
 205                 goto init_error;
 206
 207         err = st_sensors_set_fullscale(indio_dev,
 208                                                 sdata->current_fullscale->num);
 209         if (err < 0)
 210                 goto init_error;
 211
 212         err = st_sensors_set_odr(indio_dev, sdata->odr);
 213         if (err < 0)
 214                 goto init_error;
 215
 216         /* set BDU */
 217         err = st_sensors_write_data_with_mask(indio_dev,
 218                         sdata->sensor->bdu.addr, sdata->sensor->bdu.mask, true);
 219         if (err < 0)
 220                 goto init_error;
 221
 222         err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
 223
 224 init_error:
 225         return err;
 226 }
 227 EXPORT_SYMBOL(st_sensors_init_sensor);
 228
 229 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
 230 {
 231         int err;
 232         struct st_sensor_data *sdata = iio_priv(indio_dev);
 233
 234         /* Enable/Disable the interrupt generator 1. */
 235         if (sdata->sensor->drdy_irq.ig1.en_addr > 0) {
 236                 err = st_sensors_write_data_with_mask(indio_dev,
 237                         sdata->sensor->drdy_irq.ig1.en_addr,
 238                         sdata->sensor->drdy_irq.ig1.en_mask, (int)enable);
 239                 if (err < 0)
 240                         goto st_accel_set_dataready_irq_error;
 241         }
 242
 243         /* Enable/Disable the interrupt generator for data ready. */
 244         err = st_sensors_write_data_with_mask(indio_dev,
 245                         sdata->sensor->drdy_irq.addr,
 246                         sdata->sensor->drdy_irq.mask, (int)enable);
 247
 248 st_accel_set_dataready_irq_error:
 249         return err;
 250 }
 251 EXPORT_SYMBOL(st_sensors_set_dataready_irq);
 252
 253 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
 254 {
 255         int err = -EINVAL, i;
 256         struct st_sensor_data *sdata = iio_priv(indio_dev);
 257
 258         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 259                 if ((sdata->sensor->fs.fs_avl[i].gain == scale) &&
 260                                 (sdata->sensor->fs.fs_avl[i].gain != 0)) {
 261                         err = 0;
 262                         break;
 263                 }
 264         }
 265         if (err < 0)
 266                 goto st_sensors_match_scale_error;
 267
 268         err = st_sensors_set_fullscale(indio_dev,
 269                                         sdata->sensor->fs.fs_avl[i].num);
 270
 271 st_sensors_match_scale_error:
 272         return err;
 273 }
 274 EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain);
 275
 276 static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
 277                                                         u8 ch_addr, int *data)
 278 {
 279         int err;
 280         u8 outdata[ST_SENSORS_BYTE_FOR_CHANNEL];
 281         struct st_sensor_data *sdata = iio_priv(indio_dev);
 282
 283         err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
 284                                 ch_addr, ST_SENSORS_BYTE_FOR_CHANNEL,
 285                                 outdata, sdata->multiread_bit);
 286         if (err < 0)
 287                 goto read_error;
 288
 289         *data = (s16)get_unaligned_le16(outdata);
 290
 291 read_error:
 292         return err;
 293 }
 294
 295 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
 296                                 struct iio_chan_spec const *ch, int *val)
 297 {
 298         int err;
 299         struct st_sensor_data *sdata = iio_priv(indio_dev);
 300
 301         mutex_lock(&indio_dev->mlock);
 302         if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
 303                 err = -EBUSY;
 304                 goto read_error;
 305         } else {
 306                 err = st_sensors_set_enable(indio_dev, true);
 307                 if (err < 0)
 308                         goto read_error;
 309
 310                 msleep((sdata->sensor->bootime * 1000) / sdata->odr);
 311                 err = st_sensors_read_axis_data(indio_dev, ch->address, val);
 312                 if (err < 0)
 313                         goto read_error;
 314
 315                 *val = *val >> ch->scan_type.shift;
 316         }
 317         mutex_unlock(&indio_dev->mlock);
 318
 319         return err;
 320
 321 read_error:
 322         mutex_unlock(&indio_dev->mlock);
 323         return err;
 324 }
 325 EXPORT_SYMBOL(st_sensors_read_info_raw);
 326
 327 int st_sensors_check_device_support(struct iio_dev *indio_dev,
 328                         int num_sensors_list, const struct st_sensors *sensors)
 329 {
 330         u8 wai;
 331         int i, n, err;
 332         struct st_sensor_data *sdata = iio_priv(indio_dev);
 333
 334         err = sdata->tf->read_byte(&sdata->tb, sdata->dev,
 335                                         ST_SENSORS_DEFAULT_WAI_ADDRESS, &wai);
 336         if (err < 0) {
 337                 dev_err(&indio_dev->dev, "failed to read Who-Am-I register.\n");
 338                 goto read_wai_error;
 339         }
 340
 341         for (i = 0; i < num_sensors_list; i++) {
 342                 if (sensors[i].wai == wai)
 343                         break;
 344         }
 345         if (i == num_sensors_list)
 346                 goto device_not_supported;
 347
 348         for (n = 0; n < ARRAY_SIZE(sensors[i].sensors_supported); n++) {
 349                 if (strcmp(indio_dev->name,
 350                                 &sensors[i].sensors_supported[n][0]) == 0)
 351                         break;
 352         }
 353         if (n == ARRAY_SIZE(sensors[i].sensors_supported)) {
 354                 dev_err(&indio_dev->dev, "device name and WhoAmI mismatch.\n");
 355                 goto sensor_name_mismatch;
 356         }
 357
 358         sdata->sensor = (struct st_sensors *)&sensors[i];
 359
 360         return i;
 361
 362 device_not_supported:
 363         dev_err(&indio_dev->dev, "device not supported: WhoAmI (0x%x).\n", wai);
 364 sensor_name_mismatch:
 365         err = -ENODEV;
 366 read_wai_error:
 367         return err;
 368 }
 369 EXPORT_SYMBOL(st_sensors_check_device_support);
 370
 371 ssize_t st_sensors_sysfs_get_sampling_frequency(struct device *dev,
 372                                 struct device_attribute *attr, char *buf)
 373 {
 374         struct st_sensor_data *adata = iio_priv(dev_get_drvdata(dev));
 375
 376         return sprintf(buf, "%d\n", adata->odr);
 377 }
 378 EXPORT_SYMBOL(st_sensors_sysfs_get_sampling_frequency);
 379
 380 ssize_t st_sensors_sysfs_set_sampling_frequency(struct device *dev,
 381                 struct device_attribute *attr, const char *buf, size_t size)
 382 {
 383         int err;
 384         unsigned int odr;
 385         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 386
 387         err = kstrtoint(buf, 10, &odr);
 388         if (err < 0)
 389                 goto conversion_error;
 390
 391         mutex_lock(&indio_dev->mlock);
 392         err = st_sensors_set_odr(indio_dev, odr);
 393         mutex_unlock(&indio_dev->mlock);
 394
 395 conversion_error:
 396         return err < 0 ? err : size;
 397 }
 398 EXPORT_SYMBOL(st_sensors_sysfs_set_sampling_frequency);
 399
 400 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
 401                                 struct device_attribute *attr, char *buf)
 402 {
 403         int i, len = 0;
 404         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 405         struct st_sensor_data *sdata = iio_priv(indio_dev);
 406
 407         mutex_lock(&indio_dev->mlock);
 408         for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
 409                 if (sdata->sensor->odr.odr_avl[i].hz == 0)
 410                         break;
 411
 412                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
 413                                         sdata->sensor->odr.odr_avl[i].hz);
 414         }
 415         mutex_unlock(&indio_dev->mlock);
 416         buf[len - 1] = '\n';
 417
 418         return len;
 419 }
 420 EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail);
 421
 422 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
 423                                 struct device_attribute *attr, char *buf)
 424 {
 425         int i, len = 0;
 426         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 427         struct st_sensor_data *sdata = iio_priv(indio_dev);
 428
 429         mutex_lock(&indio_dev->mlock);
 430         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 431                 if (sdata->sensor->fs.fs_avl[i].num == 0)
 432                         break;
 433
 434                 len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
 435                                         sdata->sensor->fs.fs_avl[i].gain);
 436         }
 437         mutex_unlock(&indio_dev->mlock);
 438         buf[len - 1] = '\n';
 439
 440         return len;
 441 }
 442 EXPORT_SYMBOL(st_sensors_sysfs_scale_avail);
 443
 444 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 445 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
 446 MODULE_LICENSE("GPL v2");