drivers/iio/pressure/st_pressure_core.c

   1 /*
   2  * STMicroelectronics pressures driver
   3  *
   4  * Copyright 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/trigger.h>
  25 #include <linux/iio/buffer.h>
  26 #include <linux/regulator/consumer.h>
  27 #include <asm/unaligned.h>
  28
  29 #include <linux/iio/common/st_sensors.h>
  30 #include "st_pressure.h"
  31
  32 #define ST_PRESS_LSB_PER_MBAR                   4096UL
  33 #define ST_PRESS_KPASCAL_NANO_SCALE             (100000000UL / \
  34                                                  ST_PRESS_LSB_PER_MBAR)
  35 #define ST_PRESS_LSB_PER_CELSIUS                480UL
  36 #define ST_PRESS_CELSIUS_NANO_SCALE             (1000000000UL / \
  37                                                  ST_PRESS_LSB_PER_CELSIUS)
  38 #define ST_PRESS_NUMBER_DATA_CHANNELS           1
  39
  40 /* FULLSCALE */
  41 #define ST_PRESS_FS_AVL_1260MB                  1260
  42
  43 /* CUSTOM VALUES FOR LPS331AP SENSOR */
  44 #define ST_PRESS_LPS331AP_WAI_EXP               0xbb
  45 #define ST_PRESS_LPS331AP_ODR_ADDR              0x20
  46 #define ST_PRESS_LPS331AP_ODR_MASK              0x70
  47 #define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL       0x01
  48 #define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL       0x05
  49 #define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL      0x06
  50 #define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL      0x07
  51 #define ST_PRESS_LPS331AP_PW_ADDR               0x20
  52 #define ST_PRESS_LPS331AP_PW_MASK               0x80
  53 #define ST_PRESS_LPS331AP_FS_ADDR               0x23
  54 #define ST_PRESS_LPS331AP_FS_MASK               0x30
  55 #define ST_PRESS_LPS331AP_FS_AVL_1260_VAL       0x00
  56 #define ST_PRESS_LPS331AP_FS_AVL_1260_GAIN      ST_PRESS_KPASCAL_NANO_SCALE
  57 #define ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN      ST_PRESS_CELSIUS_NANO_SCALE
  58 #define ST_PRESS_LPS331AP_BDU_ADDR              0x20
  59 #define ST_PRESS_LPS331AP_BDU_MASK              0x04
  60 #define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR         0x22
  61 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK    0x04
  62 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK    0x20
  63 #define ST_PRESS_LPS331AP_MULTIREAD_BIT         true
  64 #define ST_PRESS_LPS331AP_TEMP_OFFSET           42500
  65 #define ST_PRESS_LPS331AP_OUT_XL_ADDR           0x28
  66 #define ST_TEMP_LPS331AP_OUT_L_ADDR             0x2b
  67
  68 /* CUSTOM VALUES FOR LPS001WP SENSOR */
  69 #define ST_PRESS_LPS001WP_WAI_EXP               0xba
  70 #define ST_PRESS_LPS001WP_ODR_ADDR              0x20
  71 #define ST_PRESS_LPS001WP_ODR_MASK              0x30
  72 #define ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL       0x01
  73 #define ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL       0x02
  74 #define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL      0x03
  75 #define ST_PRESS_LPS001WP_PW_ADDR               0x20
  76 #define ST_PRESS_LPS001WP_PW_MASK               0x40
  77 #define ST_PRESS_LPS001WP_BDU_ADDR              0x20
  78 #define ST_PRESS_LPS001WP_BDU_MASK              0x04
  79 #define ST_PRESS_LPS001WP_MULTIREAD_BIT         true
  80 #define ST_PRESS_LPS001WP_OUT_L_ADDR            0x28
  81 #define ST_TEMP_LPS001WP_OUT_L_ADDR             0x2a
  82
  83 static const struct iio_chan_spec st_press_lps331ap_channels[] = {
  84         {
  85                 .type = IIO_PRESSURE,
  86                 .channel2 = IIO_NO_MOD,
  87                 .address = ST_PRESS_LPS331AP_OUT_XL_ADDR,
  88                 .scan_index = ST_SENSORS_SCAN_X,
  89                 .scan_type = {
  90                         .sign = 'u',
  91                         .realbits = 24,
  92                         .storagebits = 24,
  93                         .endianness = IIO_LE,
  94                 },
  95                 .info_mask_separate =
  96                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  97                 .modified = 0,
  98         },
  99         {
 100                 .type = IIO_TEMP,
 101                 .channel2 = IIO_NO_MOD,
 102                 .address = ST_TEMP_LPS331AP_OUT_L_ADDR,
 103                 .scan_index = -1,
 104                 .scan_type = {
 105                         .sign = 'u',
 106                         .realbits = 16,
 107                         .storagebits = 16,
 108                         .endianness = IIO_LE,
 109                 },
 110                 .info_mask_separate =
 111                         BIT(IIO_CHAN_INFO_RAW) |
 112                         BIT(IIO_CHAN_INFO_SCALE) |
 113                         BIT(IIO_CHAN_INFO_OFFSET),
 114                 .modified = 0,
 115         },
 116         IIO_CHAN_SOFT_TIMESTAMP(1)
 117 };
 118
 119 static const struct iio_chan_spec st_press_lps001wp_channels[] = {
 120         {
 121                 .type = IIO_PRESSURE,
 122                 .channel2 = IIO_NO_MOD,
 123                 .address = ST_PRESS_LPS001WP_OUT_L_ADDR,
 124                 .scan_index = ST_SENSORS_SCAN_X,
 125                 .scan_type = {
 126                         .sign = 'u',
 127                         .realbits = 16,
 128                         .storagebits = 16,
 129                         .endianness = IIO_LE,
 130                 },
 131                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 132                 .modified = 0,
 133         },
 134         {
 135                 .type = IIO_TEMP,
 136                 .channel2 = IIO_NO_MOD,
 137                 .address = ST_TEMP_LPS001WP_OUT_L_ADDR,
 138                 .scan_index = -1,
 139                 .scan_type = {
 140                         .sign = 'u',
 141                         .realbits = 16,
 142                         .storagebits = 16,
 143                         .endianness = IIO_LE,
 144                 },
 145                 .info_mask_separate =
 146                         BIT(IIO_CHAN_INFO_RAW) |
 147                         BIT(IIO_CHAN_INFO_OFFSET),
 148                 .modified = 0,
 149         },
 150         IIO_CHAN_SOFT_TIMESTAMP(1)
 151 };
 152
 153 static const struct st_sensors st_press_sensors[] = {
 154         {
 155                 .wai = ST_PRESS_LPS331AP_WAI_EXP,
 156                 .sensors_supported = {
 157                         [0] = LPS331AP_PRESS_DEV_NAME,
 158                 },
 159                 .ch = (struct iio_chan_spec *)st_press_lps331ap_channels,
 160                 .num_ch = ARRAY_SIZE(st_press_lps331ap_channels),
 161                 .odr = {
 162                         .addr = ST_PRESS_LPS331AP_ODR_ADDR,
 163                         .mask = ST_PRESS_LPS331AP_ODR_MASK,
 164                         .odr_avl = {
 165                                 { 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, },
 166                                 { 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, },
 167                                 { 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, },
 168                                 { 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, },
 169                         },
 170                 },
 171                 .pw = {
 172                         .addr = ST_PRESS_LPS331AP_PW_ADDR,
 173                         .mask = ST_PRESS_LPS331AP_PW_MASK,
 174                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 175                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 176                 },
 177                 .fs = {
 178                         .addr = ST_PRESS_LPS331AP_FS_ADDR,
 179                         .mask = ST_PRESS_LPS331AP_FS_MASK,
 180                         .fs_avl = {
 181                                 [0] = {
 182                                         .num = ST_PRESS_FS_AVL_1260MB,
 183                                         .value = ST_PRESS_LPS331AP_FS_AVL_1260_VAL,
 184                                         .gain = ST_PRESS_LPS331AP_FS_AVL_1260_GAIN,
 185                                         .gain2 = ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN,
 186                                 },
 187                         },
 188                 },
 189                 .bdu = {
 190                         .addr = ST_PRESS_LPS331AP_BDU_ADDR,
 191                         .mask = ST_PRESS_LPS331AP_BDU_MASK,
 192                 },
 193                 .drdy_irq = {
 194                         .addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR,
 195                         .mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK,
 196                         .mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK,
 197                 },
 198                 .multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT,
 199                 .bootime = 2,
 200         },
 201         {
 202                 .wai = ST_PRESS_LPS001WP_WAI_EXP,
 203                 .sensors_supported = {
 204                         [0] = LPS001WP_PRESS_DEV_NAME,
 205                 },
 206                 .ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
 207                 .num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
 208                 .odr = {
 209                         .addr = ST_PRESS_LPS001WP_ODR_ADDR,
 210                         .mask = ST_PRESS_LPS001WP_ODR_MASK,
 211                         .odr_avl = {
 212                                 { 1, ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL, },
 213                                 { 7, ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL, },
 214                                 { 13, ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL, },
 215                         },
 216                 },
 217                 .pw = {
 218                         .addr = ST_PRESS_LPS001WP_PW_ADDR,
 219                         .mask = ST_PRESS_LPS001WP_PW_MASK,
 220                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 221                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 222                 },
 223                 .fs = {
 224                         .addr = 0,
 225                 },
 226                 .bdu = {
 227                         .addr = ST_PRESS_LPS001WP_BDU_ADDR,
 228                         .mask = ST_PRESS_LPS001WP_BDU_MASK,
 229                 },
 230                 .drdy_irq = {
 231                         .addr = 0,
 232                 },
 233                 .multi_read_bit = ST_PRESS_LPS001WP_MULTIREAD_BIT,
 234                 .bootime = 2,
 235         },
 236 };
 237
 238 static int st_press_read_raw(struct iio_dev *indio_dev,
 239                         struct iio_chan_spec const *ch, int *val,
 240                                                         int *val2, long mask)
 241 {
 242         int err;
 243         struct st_sensor_data *pdata = iio_priv(indio_dev);
 244
 245         switch (mask) {
 246         case IIO_CHAN_INFO_RAW:
 247                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 248                 if (err < 0)
 249                         goto read_error;
 250
 251                 return IIO_VAL_INT;
 252         case IIO_CHAN_INFO_SCALE:
 253                 *val = 0;
 254
 255                 switch (ch->type) {
 256                 case IIO_PRESSURE:
 257                         *val2 = pdata->current_fullscale->gain;
 258                         break;
 259                 case IIO_TEMP:
 260                         *val2 = pdata->current_fullscale->gain2;
 261                         break;
 262                 default:
 263                         err = -EINVAL;
 264                         goto read_error;
 265                 }
 266
 267                 return IIO_VAL_INT_PLUS_NANO;
 268         case IIO_CHAN_INFO_OFFSET:
 269                 switch (ch->type) {
 270                 case IIO_TEMP:
 271                         *val = 425;
 272                         *val2 = 10;
 273                         break;
 274                 default:
 275                         err = -EINVAL;
 276                         goto read_error;
 277                 }
 278
 279                 return IIO_VAL_FRACTIONAL;
 280         default:
 281                 return -EINVAL;
 282         }
 283
 284 read_error:
 285         return err;
 286 }
 287
 288 static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
 289 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 290
 291 static struct attribute *st_press_attributes[] = {
 292         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 293         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 294         NULL,
 295 };
 296
 297 static const struct attribute_group st_press_attribute_group = {
 298         .attrs = st_press_attributes,
 299 };
 300
 301 static const struct iio_info press_info = {
 302         .driver_module = THIS_MODULE,
 303         .attrs = &st_press_attribute_group,
 304         .read_raw = &st_press_read_raw,
 305 };
 306
 307 #ifdef CONFIG_IIO_TRIGGER
 308 static const struct iio_trigger_ops st_press_trigger_ops = {
 309         .owner = THIS_MODULE,
 310         .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
 311 };
 312 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
 313 #else
 314 #define ST_PRESS_TRIGGER_OPS NULL
 315 #endif
 316
 317 static void st_press_power_enable(struct iio_dev *indio_dev)
 318 {
 319         struct st_sensor_data *pdata = iio_priv(indio_dev);
 320         int err;
 321
 322         /* Regulators not mandatory, but if requested we should enable them. */
 323         pdata->vdd = devm_regulator_get_optional(&indio_dev->dev, "vdd");
 324         if (!IS_ERR(pdata->vdd)) {
 325                 err = regulator_enable(pdata->vdd);
 326                 if (err != 0)
 327                         dev_warn(&indio_dev->dev,
 328                                  "Failed to enable specified Vdd supply\n");
 329         }
 330
 331         pdata->vdd_io = devm_regulator_get_optional(&indio_dev->dev, "vddio");
 332         if (!IS_ERR(pdata->vdd_io)) {
 333                 err = regulator_enable(pdata->vdd_io);
 334                 if (err != 0)
 335                         dev_warn(&indio_dev->dev,
 336                                  "Failed to enable specified Vdd_IO supply\n");
 337         }
 338 }
 339
 340 static void st_press_power_disable(struct iio_dev *indio_dev)
 341 {
 342         struct st_sensor_data *pdata = iio_priv(indio_dev);
 343
 344         if (!IS_ERR(pdata->vdd))
 345                 regulator_disable(pdata->vdd);
 346
 347         if (!IS_ERR(pdata->vdd_io))
 348                 regulator_disable(pdata->vdd_io);
 349 }
 350
 351 int st_press_common_probe(struct iio_dev *indio_dev,
 352                                 struct st_sensors_platform_data *plat_data)
 353 {
 354         struct st_sensor_data *pdata = iio_priv(indio_dev);
 355         int irq = pdata->get_irq_data_ready(indio_dev);
 356         int err;
 357
 358         indio_dev->modes = INDIO_DIRECT_MODE;
 359         indio_dev->info = &press_info;
 360
 361         st_press_power_enable(indio_dev);
 362
 363         err = st_sensors_check_device_support(indio_dev,
 364                                               ARRAY_SIZE(st_press_sensors),
 365                                               st_press_sensors);
 366         if (err < 0)
 367                 return err;
 368
 369         pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
 370         pdata->multiread_bit     = pdata->sensor->multi_read_bit;
 371         indio_dev->channels      = pdata->sensor->ch;
 372         indio_dev->num_channels  = pdata->sensor->num_ch;
 373
 374         if (pdata->sensor->fs.addr != 0)
 375                 pdata->current_fullscale = (struct st_sensor_fullscale_avl *)
 376                         &pdata->sensor->fs.fs_avl[0];
 377
 378         pdata->odr = pdata->sensor->odr.odr_avl[0].hz;
 379
 380         /* Some devices don't support a data ready pin. */
 381         if (!plat_data && pdata->sensor->drdy_irq.addr)
 382                 plat_data =
 383                         (struct st_sensors_platform_data *)&default_press_pdata;
 384
 385         err = st_sensors_init_sensor(indio_dev, plat_data);
 386         if (err < 0)
 387                 return err;
 388
 389         err = st_press_allocate_ring(indio_dev);
 390         if (err < 0)
 391                 return err;
 392
 393         if (irq > 0) {
 394                 err = st_sensors_allocate_trigger(indio_dev,
 395                                                   ST_PRESS_TRIGGER_OPS);
 396                 if (err < 0)
 397                         goto st_press_probe_trigger_error;
 398         }
 399
 400         err = iio_device_register(indio_dev);
 401         if (err)
 402                 goto st_press_device_register_error;
 403
 404         return err;
 405
 406 st_press_device_register_error:
 407         if (irq > 0)
 408                 st_sensors_deallocate_trigger(indio_dev);
 409 st_press_probe_trigger_error:
 410         st_press_deallocate_ring(indio_dev);
 411
 412         return err;
 413 }
 414 EXPORT_SYMBOL(st_press_common_probe);
 415
 416 void st_press_common_remove(struct iio_dev *indio_dev)
 417 {
 418         struct st_sensor_data *pdata = iio_priv(indio_dev);
 419
 420         st_press_power_disable(indio_dev);
 421
 422         iio_device_unregister(indio_dev);
 423         if (pdata->get_irq_data_ready(indio_dev) > 0)
 424                 st_sensors_deallocate_trigger(indio_dev);
 425
 426         st_press_deallocate_ring(indio_dev);
 427 }
 428 EXPORT_SYMBOL(st_press_common_remove);
 429
 430 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 431 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
 432 MODULE_LICENSE("GPL v2");