drivers/iio/gyro/st_gyro_core.c

   1 /*
   2  * STMicroelectronics gyroscopes 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/trigger.h>
  25 #include <linux/iio/buffer.h>
  26
  27 #include <linux/iio/common/st_sensors.h>
  28 #include "st_gyro.h"
  29
  30 /* DEFAULT VALUE FOR SENSORS */
  31 #define ST_GYRO_DEFAULT_OUT_X_L_ADDR            0x28
  32 #define ST_GYRO_DEFAULT_OUT_Y_L_ADDR            0x2a
  33 #define ST_GYRO_DEFAULT_OUT_Z_L_ADDR            0x2c
  34
  35 /* FULLSCALE */
  36 #define ST_GYRO_FS_AVL_250DPS                   250
  37 #define ST_GYRO_FS_AVL_500DPS                   500
  38 #define ST_GYRO_FS_AVL_2000DPS                  2000
  39
  40 /* CUSTOM VALUES FOR SENSOR 1 */
  41 #define ST_GYRO_1_WAI_EXP                       0xd3
  42 #define ST_GYRO_1_ODR_ADDR                      0x20
  43 #define ST_GYRO_1_ODR_MASK                      0xc0
  44 #define ST_GYRO_1_ODR_AVL_100HZ_VAL             0x00
  45 #define ST_GYRO_1_ODR_AVL_200HZ_VAL             0x01
  46 #define ST_GYRO_1_ODR_AVL_400HZ_VAL             0x02
  47 #define ST_GYRO_1_ODR_AVL_800HZ_VAL             0x03
  48 #define ST_GYRO_1_PW_ADDR                       0x20
  49 #define ST_GYRO_1_PW_MASK                       0x08
  50 #define ST_GYRO_1_FS_ADDR                       0x23
  51 #define ST_GYRO_1_FS_MASK                       0x30
  52 #define ST_GYRO_1_FS_AVL_250_VAL                0x00
  53 #define ST_GYRO_1_FS_AVL_500_VAL                0x01
  54 #define ST_GYRO_1_FS_AVL_2000_VAL               0x02
  55 #define ST_GYRO_1_FS_AVL_250_GAIN               IIO_DEGREE_TO_RAD(8750)
  56 #define ST_GYRO_1_FS_AVL_500_GAIN               IIO_DEGREE_TO_RAD(17500)
  57 #define ST_GYRO_1_FS_AVL_2000_GAIN              IIO_DEGREE_TO_RAD(70000)
  58 #define ST_GYRO_1_BDU_ADDR                      0x23
  59 #define ST_GYRO_1_BDU_MASK                      0x80
  60 #define ST_GYRO_1_DRDY_IRQ_ADDR                 0x22
  61 #define ST_GYRO_1_DRDY_IRQ_MASK                 0x08
  62 #define ST_GYRO_1_MULTIREAD_BIT                 true
  63
  64 /* CUSTOM VALUES FOR SENSOR 2 */
  65 #define ST_GYRO_2_WAI_EXP                       0xd4
  66 #define ST_GYRO_2_ODR_ADDR                      0x20
  67 #define ST_GYRO_2_ODR_MASK                      0xc0
  68 #define ST_GYRO_2_ODR_AVL_95HZ_VAL              0x00
  69 #define ST_GYRO_2_ODR_AVL_190HZ_VAL             0x01
  70 #define ST_GYRO_2_ODR_AVL_380HZ_VAL             0x02
  71 #define ST_GYRO_2_ODR_AVL_760HZ_VAL             0x03
  72 #define ST_GYRO_2_PW_ADDR                       0x20
  73 #define ST_GYRO_2_PW_MASK                       0x08
  74 #define ST_GYRO_2_FS_ADDR                       0x23
  75 #define ST_GYRO_2_FS_MASK                       0x30
  76 #define ST_GYRO_2_FS_AVL_250_VAL                0x00
  77 #define ST_GYRO_2_FS_AVL_500_VAL                0x01
  78 #define ST_GYRO_2_FS_AVL_2000_VAL               0x02
  79 #define ST_GYRO_2_FS_AVL_250_GAIN               IIO_DEGREE_TO_RAD(8750)
  80 #define ST_GYRO_2_FS_AVL_500_GAIN               IIO_DEGREE_TO_RAD(17500)
  81 #define ST_GYRO_2_FS_AVL_2000_GAIN              IIO_DEGREE_TO_RAD(70000)
  82 #define ST_GYRO_2_BDU_ADDR                      0x23
  83 #define ST_GYRO_2_BDU_MASK                      0x80
  84 #define ST_GYRO_2_DRDY_IRQ_ADDR                 0x22
  85 #define ST_GYRO_2_DRDY_IRQ_MASK                 0x08
  86 #define ST_GYRO_2_MULTIREAD_BIT                 true
  87
  88 static const struct iio_chan_spec st_gyro_16bit_channels[] = {
  89         ST_SENSORS_LSM_CHANNELS(IIO_ANGL_VEL, ST_SENSORS_SCAN_X,
  90                 IIO_MOD_X, IIO_LE, ST_SENSORS_DEFAULT_16_REALBITS,
  91                                                 ST_GYRO_DEFAULT_OUT_X_L_ADDR),
  92         ST_SENSORS_LSM_CHANNELS(IIO_ANGL_VEL, ST_SENSORS_SCAN_Y,
  93                 IIO_MOD_Y, IIO_LE, ST_SENSORS_DEFAULT_16_REALBITS,
  94                                                 ST_GYRO_DEFAULT_OUT_Y_L_ADDR),
  95         ST_SENSORS_LSM_CHANNELS(IIO_ANGL_VEL, ST_SENSORS_SCAN_Z,
  96                 IIO_MOD_Z, IIO_LE, ST_SENSORS_DEFAULT_16_REALBITS,
  97                                                 ST_GYRO_DEFAULT_OUT_Z_L_ADDR),
  98         IIO_CHAN_SOFT_TIMESTAMP(3)
  99 };
 100
 101 static const struct st_sensors st_gyro_sensors[] = {
 102         {
 103                 .wai = ST_GYRO_1_WAI_EXP,
 104                 .sensors_supported = {
 105                         [0] = L3G4200D_GYRO_DEV_NAME,
 106                         [1] = LSM330DL_GYRO_DEV_NAME,
 107                 },
 108                 .ch = (struct iio_chan_spec *)st_gyro_16bit_channels,
 109                 .odr = {
 110                         .addr = ST_GYRO_1_ODR_ADDR,
 111                         .mask = ST_GYRO_1_ODR_MASK,
 112                         .odr_avl = {
 113                                 { 100, ST_GYRO_1_ODR_AVL_100HZ_VAL, },
 114                                 { 200, ST_GYRO_1_ODR_AVL_200HZ_VAL, },
 115                                 { 400, ST_GYRO_1_ODR_AVL_400HZ_VAL, },
 116                                 { 800, ST_GYRO_1_ODR_AVL_800HZ_VAL, },
 117                         },
 118                 },
 119                 .pw = {
 120                         .addr = ST_GYRO_1_PW_ADDR,
 121                         .mask = ST_GYRO_1_PW_MASK,
 122                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 123                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 124                 },
 125                 .enable_axis = {
 126                         .addr = ST_SENSORS_DEFAULT_AXIS_ADDR,
 127                         .mask = ST_SENSORS_DEFAULT_AXIS_MASK,
 128                 },
 129                 .fs = {
 130                         .addr = ST_GYRO_1_FS_ADDR,
 131                         .mask = ST_GYRO_1_FS_MASK,
 132                         .fs_avl = {
 133                                 [0] = {
 134                                         .num = ST_GYRO_FS_AVL_250DPS,
 135                                         .value = ST_GYRO_1_FS_AVL_250_VAL,
 136                                         .gain = ST_GYRO_1_FS_AVL_250_GAIN,
 137                                 },
 138                                 [1] = {
 139                                         .num = ST_GYRO_FS_AVL_500DPS,
 140                                         .value = ST_GYRO_1_FS_AVL_500_VAL,
 141                                         .gain = ST_GYRO_1_FS_AVL_500_GAIN,
 142                                 },
 143                                 [2] = {
 144                                         .num = ST_GYRO_FS_AVL_2000DPS,
 145                                         .value = ST_GYRO_1_FS_AVL_2000_VAL,
 146                                         .gain = ST_GYRO_1_FS_AVL_2000_GAIN,
 147                                 },
 148                         },
 149                 },
 150                 .bdu = {
 151                         .addr = ST_GYRO_1_BDU_ADDR,
 152                         .mask = ST_GYRO_1_BDU_MASK,
 153                 },
 154                 .drdy_irq = {
 155                         .addr = ST_GYRO_1_DRDY_IRQ_ADDR,
 156                         .mask = ST_GYRO_1_DRDY_IRQ_MASK,
 157                 },
 158                 .multi_read_bit = ST_GYRO_1_MULTIREAD_BIT,
 159                 .bootime = 2,
 160         },
 161         {
 162                 .wai = ST_GYRO_2_WAI_EXP,
 163                 .sensors_supported = {
 164                         [0] = L3GD20_GYRO_DEV_NAME,
 165                         [1] = L3GD20H_GYRO_DEV_NAME,
 166                         [2] = LSM330D_GYRO_DEV_NAME,
 167                         [3] = LSM330DLC_GYRO_DEV_NAME,
 168                         [4] = L3G4IS_GYRO_DEV_NAME,
 169                         [5] = LSM330_GYRO_DEV_NAME,
 170                 },
 171                 .ch = (struct iio_chan_spec *)st_gyro_16bit_channels,
 172                 .odr = {
 173                         .addr = ST_GYRO_2_ODR_ADDR,
 174                         .mask = ST_GYRO_2_ODR_MASK,
 175                         .odr_avl = {
 176                                 { 95, ST_GYRO_2_ODR_AVL_95HZ_VAL, },
 177                                 { 190, ST_GYRO_2_ODR_AVL_190HZ_VAL, },
 178                                 { 380, ST_GYRO_2_ODR_AVL_380HZ_VAL, },
 179                                 { 760, ST_GYRO_2_ODR_AVL_760HZ_VAL, },
 180                         },
 181                 },
 182                 .pw = {
 183                         .addr = ST_GYRO_2_PW_ADDR,
 184                         .mask = ST_GYRO_2_PW_MASK,
 185                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 186                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 187                 },
 188                 .enable_axis = {
 189                         .addr = ST_SENSORS_DEFAULT_AXIS_ADDR,
 190                         .mask = ST_SENSORS_DEFAULT_AXIS_MASK,
 191                 },
 192                 .fs = {
 193                         .addr = ST_GYRO_2_FS_ADDR,
 194                         .mask = ST_GYRO_2_FS_MASK,
 195                         .fs_avl = {
 196                                 [0] = {
 197                                         .num = ST_GYRO_FS_AVL_250DPS,
 198                                         .value = ST_GYRO_2_FS_AVL_250_VAL,
 199                                         .gain = ST_GYRO_2_FS_AVL_250_GAIN,
 200                                 },
 201                                 [1] = {
 202                                         .num = ST_GYRO_FS_AVL_500DPS,
 203                                         .value = ST_GYRO_2_FS_AVL_500_VAL,
 204                                         .gain = ST_GYRO_2_FS_AVL_500_GAIN,
 205                                 },
 206                                 [2] = {
 207                                         .num = ST_GYRO_FS_AVL_2000DPS,
 208                                         .value = ST_GYRO_2_FS_AVL_2000_VAL,
 209                                         .gain = ST_GYRO_2_FS_AVL_2000_GAIN,
 210                                 },
 211                         },
 212                 },
 213                 .bdu = {
 214                         .addr = ST_GYRO_2_BDU_ADDR,
 215                         .mask = ST_GYRO_2_BDU_MASK,
 216                 },
 217                 .drdy_irq = {
 218                         .addr = ST_GYRO_2_DRDY_IRQ_ADDR,
 219                         .mask = ST_GYRO_2_DRDY_IRQ_MASK,
 220                 },
 221                 .multi_read_bit = ST_GYRO_2_MULTIREAD_BIT,
 222                 .bootime = 2,
 223         },
 224 };
 225
 226 static int st_gyro_read_raw(struct iio_dev *indio_dev,
 227                         struct iio_chan_spec const *ch, int *val,
 228                                                         int *val2, long mask)
 229 {
 230         int err;
 231         struct st_sensor_data *gdata = iio_priv(indio_dev);
 232
 233         switch (mask) {
 234         case IIO_CHAN_INFO_RAW:
 235                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 236                 if (err < 0)
 237                         goto read_error;
 238
 239                 return IIO_VAL_INT;
 240         case IIO_CHAN_INFO_SCALE:
 241                 *val = 0;
 242                 *val2 = gdata->current_fullscale->gain;
 243                 return IIO_VAL_INT_PLUS_MICRO;
 244         default:
 245                 return -EINVAL;
 246         }
 247
 248 read_error:
 249         return err;
 250 }
 251
 252 static int st_gyro_write_raw(struct iio_dev *indio_dev,
 253                 struct iio_chan_spec const *chan, int val, int val2, long mask)
 254 {
 255         int err;
 256
 257         switch (mask) {
 258         case IIO_CHAN_INFO_SCALE:
 259                 err = st_sensors_set_fullscale_by_gain(indio_dev, val2);
 260                 break;
 261         default:
 262                 err = -EINVAL;
 263         }
 264
 265         return err;
 266 }
 267
 268 static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
 269 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 270 static ST_SENSORS_DEV_ATTR_SCALE_AVAIL(in_anglvel_scale_available);
 271
 272 static struct attribute *st_gyro_attributes[] = {
 273         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 274         &iio_dev_attr_in_anglvel_scale_available.dev_attr.attr,
 275         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 276         NULL,
 277 };
 278
 279 static const struct attribute_group st_gyro_attribute_group = {
 280         .attrs = st_gyro_attributes,
 281 };
 282
 283 static const struct iio_info gyro_info = {
 284         .driver_module = THIS_MODULE,
 285         .attrs = &st_gyro_attribute_group,
 286         .read_raw = &st_gyro_read_raw,
 287         .write_raw = &st_gyro_write_raw,
 288 };
 289
 290 #ifdef CONFIG_IIO_TRIGGER
 291 static const struct iio_trigger_ops st_gyro_trigger_ops = {
 292         .owner = THIS_MODULE,
 293         .set_trigger_state = ST_GYRO_TRIGGER_SET_STATE,
 294 };
 295 #define ST_GYRO_TRIGGER_OPS (&st_gyro_trigger_ops)
 296 #else
 297 #define ST_GYRO_TRIGGER_OPS NULL
 298 #endif
 299
 300 int st_gyro_common_probe(struct iio_dev *indio_dev)
 301 {
 302         int err;
 303         struct st_sensor_data *gdata = iio_priv(indio_dev);
 304
 305         indio_dev->modes = INDIO_DIRECT_MODE;
 306         indio_dev->info = &gyro_info;
 307
 308         err = st_sensors_check_device_support(indio_dev,
 309                                 ARRAY_SIZE(st_gyro_sensors), st_gyro_sensors);
 310         if (err < 0)
 311                 goto st_gyro_common_probe_error;
 312
 313         gdata->multiread_bit = gdata->sensor->multi_read_bit;
 314         indio_dev->channels = gdata->sensor->ch;
 315         indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS;
 316
 317         gdata->current_fullscale = (struct st_sensor_fullscale_avl *)
 318                                                 &gdata->sensor->fs.fs_avl[0];
 319         gdata->odr = gdata->sensor->odr.odr_avl[0].hz;
 320
 321         err = st_sensors_init_sensor(indio_dev);
 322         if (err < 0)
 323                 goto st_gyro_common_probe_error;
 324
 325         if (gdata->get_irq_data_ready(indio_dev) > 0) {
 326                 err = st_gyro_allocate_ring(indio_dev);
 327                 if (err < 0)
 328                         goto st_gyro_common_probe_error;
 329
 330                 err = st_sensors_allocate_trigger(indio_dev,
 331                                                   ST_GYRO_TRIGGER_OPS);
 332                 if (err < 0)
 333                         goto st_gyro_probe_trigger_error;
 334         }
 335
 336         err = iio_device_register(indio_dev);
 337         if (err)
 338                 goto st_gyro_device_register_error;
 339
 340         return err;
 341
 342 st_gyro_device_register_error:
 343         if (gdata->get_irq_data_ready(indio_dev) > 0)
 344                 st_sensors_deallocate_trigger(indio_dev);
 345 st_gyro_probe_trigger_error:
 346         if (gdata->get_irq_data_ready(indio_dev) > 0)
 347                 st_gyro_deallocate_ring(indio_dev);
 348 st_gyro_common_probe_error:
 349         return err;
 350 }
 351 EXPORT_SYMBOL(st_gyro_common_probe);
 352
 353 void st_gyro_common_remove(struct iio_dev *indio_dev)
 354 {
 355         struct st_sensor_data *gdata = iio_priv(indio_dev);
 356
 357         iio_device_unregister(indio_dev);
 358         if (gdata->get_irq_data_ready(indio_dev) > 0) {
 359                 st_sensors_deallocate_trigger(indio_dev);
 360                 st_gyro_deallocate_ring(indio_dev);
 361         }
 362         iio_device_free(indio_dev);
 363 }
 364 EXPORT_SYMBOL(st_gyro_common_remove);
 365
 366 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 367 MODULE_DESCRIPTION("STMicroelectronics gyroscopes driver");
 368 MODULE_LICENSE("GPL v2");