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 <asm/unaligned.h>
  27
  28 #include <linux/iio/common/st_sensors.h>
  29 #include "st_pressure.h"
  30
  31 #define ST_PRESS_MBAR_TO_KPASCAL(x)             (x * 10)
  32 #define ST_PRESS_NUMBER_DATA_CHANNELS           1
  33
  34 /* DEFAULT VALUE FOR SENSORS */
  35 #define ST_PRESS_DEFAULT_OUT_XL_ADDR            0x28
  36 #define ST_TEMP_DEFAULT_OUT_L_ADDR              0x2b
  37
  38 /* FULLSCALE */
  39 #define ST_PRESS_FS_AVL_1260MB                  1260
  40
  41 /* CUSTOM VALUES FOR SENSOR 1 */
  42 #define ST_PRESS_1_WAI_EXP                      0xbb
  43 #define ST_PRESS_1_ODR_ADDR                     0x20
  44 #define ST_PRESS_1_ODR_MASK                     0x70
  45 #define ST_PRESS_1_ODR_AVL_1HZ_VAL              0x01
  46 #define ST_PRESS_1_ODR_AVL_7HZ_VAL              0x05
  47 #define ST_PRESS_1_ODR_AVL_13HZ_VAL             0x06
  48 #define ST_PRESS_1_ODR_AVL_25HZ_VAL             0x07
  49 #define ST_PRESS_1_PW_ADDR                      0x20
  50 #define ST_PRESS_1_PW_MASK                      0x80
  51 #define ST_PRESS_1_FS_ADDR                      0x23
  52 #define ST_PRESS_1_FS_MASK                      0x30
  53 #define ST_PRESS_1_FS_AVL_1260_VAL              0x00
  54 #define ST_PRESS_1_FS_AVL_1260_GAIN             ST_PRESS_MBAR_TO_KPASCAL(244141)
  55 #define ST_PRESS_1_FS_AVL_TEMP_GAIN             2083000
  56 #define ST_PRESS_1_BDU_ADDR                     0x20
  57 #define ST_PRESS_1_BDU_MASK                     0x04
  58 #define ST_PRESS_1_DRDY_IRQ_ADDR                0x22
  59 #define ST_PRESS_1_DRDY_IRQ_MASK                0x04
  60 #define ST_PRESS_1_MULTIREAD_BIT                true
  61 #define ST_PRESS_1_TEMP_OFFSET                  42500
  62
  63 static const struct iio_chan_spec st_press_channels[] = {
  64         ST_SENSORS_LSM_CHANNELS(IIO_PRESSURE,
  65                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  66                         ST_SENSORS_SCAN_X, 0, IIO_NO_MOD, 'u', IIO_LE, 24, 24,
  67                         ST_PRESS_DEFAULT_OUT_XL_ADDR),
  68         ST_SENSORS_LSM_CHANNELS(IIO_TEMP,
  69                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
  70                                                 BIT(IIO_CHAN_INFO_OFFSET),
  71                         -1, 0, IIO_NO_MOD, 's', IIO_LE, 16, 16,
  72                         ST_TEMP_DEFAULT_OUT_L_ADDR),
  73         IIO_CHAN_SOFT_TIMESTAMP(1)
  74 };
  75
  76 static const struct st_sensors st_press_sensors[] = {
  77         {
  78                 .wai = ST_PRESS_1_WAI_EXP,
  79                 .sensors_supported = {
  80                         [0] = LPS331AP_PRESS_DEV_NAME,
  81                 },
  82                 .ch = (struct iio_chan_spec *)st_press_channels,
  83                 .odr = {
  84                         .addr = ST_PRESS_1_ODR_ADDR,
  85                         .mask = ST_PRESS_1_ODR_MASK,
  86                         .odr_avl = {
  87                                 { 1, ST_PRESS_1_ODR_AVL_1HZ_VAL, },
  88                                 { 7, ST_PRESS_1_ODR_AVL_7HZ_VAL, },
  89                                 { 13, ST_PRESS_1_ODR_AVL_13HZ_VAL, },
  90                                 { 25, ST_PRESS_1_ODR_AVL_25HZ_VAL, },
  91                         },
  92                 },
  93                 .pw = {
  94                         .addr = ST_PRESS_1_PW_ADDR,
  95                         .mask = ST_PRESS_1_PW_MASK,
  96                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
  97                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
  98                 },
  99                 .fs = {
 100                         .addr = ST_PRESS_1_FS_ADDR,
 101                         .mask = ST_PRESS_1_FS_MASK,
 102                         .fs_avl = {
 103                                 [0] = {
 104                                         .num = ST_PRESS_FS_AVL_1260MB,
 105                                         .value = ST_PRESS_1_FS_AVL_1260_VAL,
 106                                         .gain = ST_PRESS_1_FS_AVL_1260_GAIN,
 107                                         .gain2 = ST_PRESS_1_FS_AVL_TEMP_GAIN,
 108                                 },
 109                         },
 110                 },
 111                 .bdu = {
 112                         .addr = ST_PRESS_1_BDU_ADDR,
 113                         .mask = ST_PRESS_1_BDU_MASK,
 114                 },
 115                 .drdy_irq = {
 116                         .addr = ST_PRESS_1_DRDY_IRQ_ADDR,
 117                         .mask = ST_PRESS_1_DRDY_IRQ_MASK,
 118                 },
 119                 .multi_read_bit = ST_PRESS_1_MULTIREAD_BIT,
 120                 .bootime = 2,
 121         },
 122 };
 123
 124 static int st_press_read_raw(struct iio_dev *indio_dev,
 125                         struct iio_chan_spec const *ch, int *val,
 126                                                         int *val2, long mask)
 127 {
 128         int err;
 129         struct st_sensor_data *pdata = iio_priv(indio_dev);
 130
 131         switch (mask) {
 132         case IIO_CHAN_INFO_RAW:
 133                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 134                 if (err < 0)
 135                         goto read_error;
 136
 137                 return IIO_VAL_INT;
 138         case IIO_CHAN_INFO_SCALE:
 139                 *val = 0;
 140
 141                 switch (ch->type) {
 142                 case IIO_PRESSURE:
 143                         *val2 = pdata->current_fullscale->gain;
 144                         break;
 145                 case IIO_TEMP:
 146                         *val2 = pdata->current_fullscale->gain2;
 147                         break;
 148                 default:
 149                         err = -EINVAL;
 150                         goto read_error;
 151                 }
 152
 153                 return IIO_VAL_INT_PLUS_NANO;
 154         case IIO_CHAN_INFO_OFFSET:
 155                 switch (ch->type) {
 156                 case IIO_TEMP:
 157                         *val = 425;
 158                         *val2 = 10;
 159                         break;
 160                 default:
 161                         err = -EINVAL;
 162                         goto read_error;
 163                 }
 164
 165                 return IIO_VAL_FRACTIONAL;
 166         default:
 167                 return -EINVAL;
 168         }
 169
 170 read_error:
 171         return err;
 172 }
 173
 174 static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
 175 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 176
 177 static struct attribute *st_press_attributes[] = {
 178         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 179         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 180         NULL,
 181 };
 182
 183 static const struct attribute_group st_press_attribute_group = {
 184         .attrs = st_press_attributes,
 185 };
 186
 187 static const struct iio_info press_info = {
 188         .driver_module = THIS_MODULE,
 189         .attrs = &st_press_attribute_group,
 190         .read_raw = &st_press_read_raw,
 191 };
 192
 193 #ifdef CONFIG_IIO_TRIGGER
 194 static const struct iio_trigger_ops st_press_trigger_ops = {
 195         .owner = THIS_MODULE,
 196         .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
 197 };
 198 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
 199 #else
 200 #define ST_PRESS_TRIGGER_OPS NULL
 201 #endif
 202
 203 int st_press_common_probe(struct iio_dev *indio_dev)
 204 {
 205         int err;
 206         struct st_sensor_data *pdata = iio_priv(indio_dev);
 207
 208         indio_dev->modes = INDIO_DIRECT_MODE;
 209         indio_dev->info = &press_info;
 210
 211         err = st_sensors_check_device_support(indio_dev,
 212                                 ARRAY_SIZE(st_press_sensors), st_press_sensors);
 213         if (err < 0)
 214                 goto st_press_common_probe_error;
 215
 216         pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
 217         pdata->multiread_bit = pdata->sensor->multi_read_bit;
 218         indio_dev->channels = pdata->sensor->ch;
 219         indio_dev->num_channels = ARRAY_SIZE(st_press_channels);
 220
 221         pdata->current_fullscale = (struct st_sensor_fullscale_avl *)
 222                                                 &pdata->sensor->fs.fs_avl[0];
 223         pdata->odr = pdata->sensor->odr.odr_avl[0].hz;
 224
 225         err = st_sensors_init_sensor(indio_dev);
 226         if (err < 0)
 227                 goto st_press_common_probe_error;
 228
 229         if (pdata->get_irq_data_ready(indio_dev) > 0) {
 230                 err = st_press_allocate_ring(indio_dev);
 231                 if (err < 0)
 232                         goto st_press_common_probe_error;
 233
 234                 err = st_sensors_allocate_trigger(indio_dev,
 235                                                         ST_PRESS_TRIGGER_OPS);
 236                 if (err < 0)
 237                         goto st_press_probe_trigger_error;
 238         }
 239
 240         err = iio_device_register(indio_dev);
 241         if (err)
 242                 goto st_press_device_register_error;
 243
 244         return err;
 245
 246 st_press_device_register_error:
 247         if (pdata->get_irq_data_ready(indio_dev) > 0)
 248                 st_sensors_deallocate_trigger(indio_dev);
 249 st_press_probe_trigger_error:
 250         if (pdata->get_irq_data_ready(indio_dev) > 0)
 251                 st_press_deallocate_ring(indio_dev);
 252 st_press_common_probe_error:
 253         return err;
 254 }
 255 EXPORT_SYMBOL(st_press_common_probe);
 256
 257 void st_press_common_remove(struct iio_dev *indio_dev)
 258 {
 259         struct st_sensor_data *pdata = iio_priv(indio_dev);
 260
 261         iio_device_unregister(indio_dev);
 262         if (pdata->get_irq_data_ready(indio_dev) > 0) {
 263                 st_sensors_deallocate_trigger(indio_dev);
 264                 st_press_deallocate_ring(indio_dev);
 265         }
 266         iio_device_free(indio_dev);
 267 }
 268 EXPORT_SYMBOL(st_press_common_remove);
 269
 270 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 271 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
 272 MODULE_LICENSE("GPL v2");