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 inline u32 st_sensors_get_unaligned_le24(const u8 *p) 24 { 25 return (s32)((p[0] | p[1] << 8 | p[2] << 16) << 8) >> 8; 26 } 27 28 static int st_sensors_write_data_with_mask(struct iio_dev *indio_dev, 29 u8 reg_addr, u8 mask, u8 data) 30 { 31 int err; 32 u8 new_data; 33 struct st_sensor_data *sdata = iio_priv(indio_dev); 34 35 err = sdata->tf->read_byte(&sdata->tb, sdata->dev, reg_addr, &new_data); 36 if (err < 0) 37 goto st_sensors_write_data_with_mask_error; 38 39 new_data = ((new_data & (~mask)) | ((data << __ffs(mask)) & mask)); 40 err = sdata->tf->write_byte(&sdata->tb, sdata->dev, reg_addr, new_data); 41 42 st_sensors_write_data_with_mask_error: 43 return err; 44 } 45 46 static int st_sensors_match_odr(struct st_sensors *sensor, 47 unsigned int odr, struct st_sensor_odr_avl *odr_out) 48 { 49 int i, ret = -EINVAL; 50 51 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) { 52 if (sensor->odr.odr_avl[i].hz == 0) 53 goto st_sensors_match_odr_error; 54 55 if (sensor->odr.odr_avl[i].hz == odr) { 56 odr_out->hz = sensor->odr.odr_avl[i].hz; 57 odr_out->value = sensor->odr.odr_avl[i].value; 58 ret = 0; 59 break; 60 } 61 } 62 63 st_sensors_match_odr_error: 64 return ret; 65 } 66 67 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr) 68 { 69 int err; 70 struct st_sensor_odr_avl odr_out = {0, 0}; 71 struct st_sensor_data *sdata = iio_priv(indio_dev); 72 73 err = st_sensors_match_odr(sdata->sensor, odr, &odr_out); 74 if (err < 0) 75 goto st_sensors_match_odr_error; 76 77 if ((sdata->sensor->odr.addr == sdata->sensor->pw.addr) && 78 (sdata->sensor->odr.mask == sdata->sensor->pw.mask)) { 79 if (sdata->enabled == true) { 80 err = st_sensors_write_data_with_mask(indio_dev, 81 sdata->sensor->odr.addr, 82 sdata->sensor->odr.mask, 83 odr_out.value); 84 } else { 85 err = 0; 86 } 87 } else { 88 err = st_sensors_write_data_with_mask(indio_dev, 89 sdata->sensor->odr.addr, sdata->sensor->odr.mask, 90 odr_out.value); 91 } 92 if (err >= 0) 93 sdata->odr = odr_out.hz; 94 95 st_sensors_match_odr_error: 96 return err; 97 } 98 EXPORT_SYMBOL(st_sensors_set_odr); 99 100 static int st_sensors_match_fs(struct st_sensors *sensor, 101 unsigned int fs, int *index_fs_avl) 102 { 103 int i, ret = -EINVAL; 104 105 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) { 106 if (sensor->fs.fs_avl[i].num == 0) 107 goto st_sensors_match_odr_error; 108 109 if (sensor->fs.fs_avl[i].num == fs) { 110 *index_fs_avl = i; 111 ret = 0; 112 break; 113 } 114 } 115 116 st_sensors_match_odr_error: 117 return ret; 118 } 119 120 static int st_sensors_set_fullscale(struct iio_dev *indio_dev, 121 unsigned int fs) 122 { 123 int err, i = 0; 124 struct st_sensor_data *sdata = iio_priv(indio_dev); 125 126 err = st_sensors_match_fs(sdata->sensor, fs, &i); 127 if (err < 0) 128 goto st_accel_set_fullscale_error; 129 130 err = st_sensors_write_data_with_mask(indio_dev, 131 sdata->sensor->fs.addr, 132 sdata->sensor->fs.mask, 133 sdata->sensor->fs.fs_avl[i].value); 134 if (err < 0) 135 goto st_accel_set_fullscale_error; 136 137 sdata->current_fullscale = (struct st_sensor_fullscale_avl *) 138 &sdata->sensor->fs.fs_avl[i]; 139 return err; 140 141 st_accel_set_fullscale_error: 142 dev_err(&indio_dev->dev, "failed to set new fullscale.\n"); 143 return err; 144 } 145 146 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable) 147 { 148 u8 tmp_value; 149 int err = -EINVAL; 150 bool found = false; 151 struct st_sensor_odr_avl odr_out = {0, 0}; 152 struct st_sensor_data *sdata = iio_priv(indio_dev); 153 154 if (enable) { 155 tmp_value = sdata->sensor->pw.value_on; 156 if ((sdata->sensor->odr.addr == sdata->sensor->pw.addr) && 157 (sdata->sensor->odr.mask == sdata->sensor->pw.mask)) { 158 err = st_sensors_match_odr(sdata->sensor, 159 sdata->odr, &odr_out); 160 if (err < 0) 161 goto set_enable_error; 162 tmp_value = odr_out.value; 163 found = true; 164 } 165 err = st_sensors_write_data_with_mask(indio_dev, 166 sdata->sensor->pw.addr, 167 sdata->sensor->pw.mask, tmp_value); 168 if (err < 0) 169 goto set_enable_error; 170 171 sdata->enabled = true; 172 173 if (found) 174 sdata->odr = odr_out.hz; 175 } else { 176 err = st_sensors_write_data_with_mask(indio_dev, 177 sdata->sensor->pw.addr, 178 sdata->sensor->pw.mask, 179 sdata->sensor->pw.value_off); 180 if (err < 0) 181 goto set_enable_error; 182 183 sdata->enabled = false; 184 } 185 186 set_enable_error: 187 return err; 188 } 189 EXPORT_SYMBOL(st_sensors_set_enable); 190 191 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable) 192 { 193 struct st_sensor_data *sdata = iio_priv(indio_dev); 194 195 return st_sensors_write_data_with_mask(indio_dev, 196 sdata->sensor->enable_axis.addr, 197 sdata->sensor->enable_axis.mask, axis_enable); 198 } 199 EXPORT_SYMBOL(st_sensors_set_axis_enable); 200 201 int st_sensors_init_sensor(struct iio_dev *indio_dev, 202 struct st_sensors_platform_data *pdata) 203 { 204 int err; 205 struct st_sensor_data *sdata = iio_priv(indio_dev); 206 207 mutex_init(&sdata->tb.buf_lock); 208 209 switch (pdata->drdy_int_pin) { 210 case 1: 211 if (sdata->sensor->drdy_irq.mask_int1 == 0) { 212 dev_err(&indio_dev->dev, 213 "DRDY on INT1 not available.\n"); 214 err = -EINVAL; 215 goto init_error; 216 } 217 sdata->drdy_int_pin = 1; 218 break; 219 case 2: 220 if (sdata->sensor->drdy_irq.mask_int2 == 0) { 221 dev_err(&indio_dev->dev, 222 "DRDY on INT2 not available.\n"); 223 err = -EINVAL; 224 goto init_error; 225 } 226 sdata->drdy_int_pin = 2; 227 break; 228 default: 229 dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n"); 230 err = -EINVAL; 231 goto init_error; 232 } 233 234 err = st_sensors_set_enable(indio_dev, false); 235 if (err < 0) 236 goto init_error; 237 238 if (sdata->current_fullscale) { 239 err = st_sensors_set_fullscale(indio_dev, 240 sdata->current_fullscale->num); 241 if (err < 0) 242 goto init_error; 243 } else 244 dev_info(&indio_dev->dev, "Full-scale not possible\n"); 245 246 err = st_sensors_set_odr(indio_dev, sdata->odr); 247 if (err < 0) 248 goto init_error; 249 250 /* set BDU */ 251 err = st_sensors_write_data_with_mask(indio_dev, 252 sdata->sensor->bdu.addr, sdata->sensor->bdu.mask, true); 253 if (err < 0) 254 goto init_error; 255 256 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 257 258 init_error: 259 return err; 260 } 261 EXPORT_SYMBOL(st_sensors_init_sensor); 262 263 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable) 264 { 265 int err; 266 u8 drdy_mask; 267 struct st_sensor_data *sdata = iio_priv(indio_dev); 268 269 /* Enable/Disable the interrupt generator 1. */ 270 if (sdata->sensor->drdy_irq.ig1.en_addr > 0) { 271 err = st_sensors_write_data_with_mask(indio_dev, 272 sdata->sensor->drdy_irq.ig1.en_addr, 273 sdata->sensor->drdy_irq.ig1.en_mask, (int)enable); 274 if (err < 0) 275 goto st_accel_set_dataready_irq_error; 276 } 277 278 if (sdata->drdy_int_pin == 1) 279 drdy_mask = sdata->sensor->drdy_irq.mask_int1; 280 else 281 drdy_mask = sdata->sensor->drdy_irq.mask_int2; 282 283 /* Enable/Disable the interrupt generator for data ready. */ 284 err = st_sensors_write_data_with_mask(indio_dev, 285 sdata->sensor->drdy_irq.addr, drdy_mask, (int)enable); 286 287 st_accel_set_dataready_irq_error: 288 return err; 289 } 290 EXPORT_SYMBOL(st_sensors_set_dataready_irq); 291 292 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale) 293 { 294 int err = -EINVAL, i; 295 struct st_sensor_data *sdata = iio_priv(indio_dev); 296 297 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) { 298 if ((sdata->sensor->fs.fs_avl[i].gain == scale) && 299 (sdata->sensor->fs.fs_avl[i].gain != 0)) { 300 err = 0; 301 break; 302 } 303 } 304 if (err < 0) 305 goto st_sensors_match_scale_error; 306 307 err = st_sensors_set_fullscale(indio_dev, 308 sdata->sensor->fs.fs_avl[i].num); 309 310 st_sensors_match_scale_error: 311 return err; 312 } 313 EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain); 314 315 static int st_sensors_read_axis_data(struct iio_dev *indio_dev, 316 struct iio_chan_spec const *ch, int *data) 317 { 318 int err; 319 u8 *outdata; 320 struct st_sensor_data *sdata = iio_priv(indio_dev); 321 unsigned int byte_for_channel = ch->scan_type.storagebits >> 3; 322 323 outdata = kmalloc(byte_for_channel, GFP_KERNEL); 324 if (!outdata) { 325 err = -EINVAL; 326 goto st_sensors_read_axis_data_error; 327 } 328 329 err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev, 330 ch->address, byte_for_channel, 331 outdata, sdata->multiread_bit); 332 if (err < 0) 333 goto st_sensors_free_memory; 334 335 if (byte_for_channel == 2) 336 *data = (s16)get_unaligned_le16(outdata); 337 else if (byte_for_channel == 3) 338 *data = (s32)st_sensors_get_unaligned_le24(outdata); 339 340 st_sensors_free_memory: 341 kfree(outdata); 342 st_sensors_read_axis_data_error: 343 return err; 344 } 345 346 int st_sensors_read_info_raw(struct iio_dev *indio_dev, 347 struct iio_chan_spec const *ch, int *val) 348 { 349 int err; 350 struct st_sensor_data *sdata = iio_priv(indio_dev); 351 352 mutex_lock(&indio_dev->mlock); 353 if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { 354 err = -EBUSY; 355 goto read_error; 356 } else { 357 err = st_sensors_set_enable(indio_dev, true); 358 if (err < 0) 359 goto read_error; 360 361 msleep((sdata->sensor->bootime * 1000) / sdata->odr); 362 err = st_sensors_read_axis_data(indio_dev, ch, val); 363 if (err < 0) 364 goto read_error; 365 366 *val = *val >> ch->scan_type.shift; 367 368 err = st_sensors_set_enable(indio_dev, false); 369 } 370 mutex_unlock(&indio_dev->mlock); 371 372 return err; 373 374 read_error: 375 mutex_unlock(&indio_dev->mlock); 376 return err; 377 } 378 EXPORT_SYMBOL(st_sensors_read_info_raw); 379 380 int st_sensors_check_device_support(struct iio_dev *indio_dev, 381 int num_sensors_list, const struct st_sensors *sensors) 382 { 383 u8 wai; 384 int i, n, err; 385 struct st_sensor_data *sdata = iio_priv(indio_dev); 386 387 err = sdata->tf->read_byte(&sdata->tb, sdata->dev, 388 ST_SENSORS_DEFAULT_WAI_ADDRESS, &wai); 389 if (err < 0) { 390 dev_err(&indio_dev->dev, "failed to read Who-Am-I register.\n"); 391 goto read_wai_error; 392 } 393 394 for (i = 0; i < num_sensors_list; i++) { 395 if (sensors[i].wai == wai) 396 break; 397 } 398 if (i == num_sensors_list) 399 goto device_not_supported; 400 401 for (n = 0; n < ARRAY_SIZE(sensors[i].sensors_supported); n++) { 402 if (strcmp(indio_dev->name, 403 &sensors[i].sensors_supported[n][0]) == 0) 404 break; 405 } 406 if (n == ARRAY_SIZE(sensors[i].sensors_supported)) { 407 dev_err(&indio_dev->dev, "device name and WhoAmI mismatch.\n"); 408 goto sensor_name_mismatch; 409 } 410 411 sdata->sensor = (struct st_sensors *)&sensors[i]; 412 413 return i; 414 415 device_not_supported: 416 dev_err(&indio_dev->dev, "device not supported: WhoAmI (0x%x).\n", wai); 417 sensor_name_mismatch: 418 err = -ENODEV; 419 read_wai_error: 420 return err; 421 } 422 EXPORT_SYMBOL(st_sensors_check_device_support); 423 424 ssize_t st_sensors_sysfs_get_sampling_frequency(struct device *dev, 425 struct device_attribute *attr, char *buf) 426 { 427 struct st_sensor_data *adata = iio_priv(dev_get_drvdata(dev)); 428 429 return sprintf(buf, "%d\n", adata->odr); 430 } 431 EXPORT_SYMBOL(st_sensors_sysfs_get_sampling_frequency); 432 433 ssize_t st_sensors_sysfs_set_sampling_frequency(struct device *dev, 434 struct device_attribute *attr, const char *buf, size_t size) 435 { 436 int err; 437 unsigned int odr; 438 struct iio_dev *indio_dev = dev_get_drvdata(dev); 439 440 err = kstrtoint(buf, 10, &odr); 441 if (err < 0) 442 goto conversion_error; 443 444 mutex_lock(&indio_dev->mlock); 445 err = st_sensors_set_odr(indio_dev, odr); 446 mutex_unlock(&indio_dev->mlock); 447 448 conversion_error: 449 return err < 0 ? err : size; 450 } 451 EXPORT_SYMBOL(st_sensors_sysfs_set_sampling_frequency); 452 453 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev, 454 struct device_attribute *attr, char *buf) 455 { 456 int i, len = 0; 457 struct iio_dev *indio_dev = dev_get_drvdata(dev); 458 struct st_sensor_data *sdata = iio_priv(indio_dev); 459 460 mutex_lock(&indio_dev->mlock); 461 for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) { 462 if (sdata->sensor->odr.odr_avl[i].hz == 0) 463 break; 464 465 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", 466 sdata->sensor->odr.odr_avl[i].hz); 467 } 468 mutex_unlock(&indio_dev->mlock); 469 buf[len - 1] = '\n'; 470 471 return len; 472 } 473 EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail); 474 475 ssize_t st_sensors_sysfs_scale_avail(struct device *dev, 476 struct device_attribute *attr, char *buf) 477 { 478 int i, len = 0; 479 struct iio_dev *indio_dev = dev_get_drvdata(dev); 480 struct st_sensor_data *sdata = iio_priv(indio_dev); 481 482 mutex_lock(&indio_dev->mlock); 483 for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) { 484 if (sdata->sensor->fs.fs_avl[i].num == 0) 485 break; 486 487 len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ", 488 sdata->sensor->fs.fs_avl[i].gain); 489 } 490 mutex_unlock(&indio_dev->mlock); 491 buf[len - 1] = '\n'; 492 493 return len; 494 } 495 EXPORT_SYMBOL(st_sensors_sysfs_scale_avail); 496 497 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 498 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core"); 499 MODULE_LICENSE("GPL v2"); 500