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_LSB_PER_MBAR                   4096UL
  32 #define ST_PRESS_KPASCAL_NANO_SCALE             (100000000UL / \
  33                                                  ST_PRESS_LSB_PER_MBAR)
  34 #define ST_PRESS_LSB_PER_CELSIUS                480UL
  35 #define ST_PRESS_CELSIUS_NANO_SCALE             (1000000000UL / \
  36                                                  ST_PRESS_LSB_PER_CELSIUS)
  37 #define ST_PRESS_NUMBER_DATA_CHANNELS           1
  38
  39 /* DEFAULT VALUE FOR SENSORS */
  40 #define ST_PRESS_DEFAULT_OUT_XL_ADDR            0x28
  41 #define ST_TEMP_DEFAULT_OUT_L_ADDR              0x2b
  42
  43 /* FULLSCALE */
  44 #define ST_PRESS_FS_AVL_1260MB                  1260
  45
  46 /* CUSTOM VALUES FOR SENSOR 1 */
  47 #define ST_PRESS_1_WAI_EXP                      0xbb
  48 #define ST_PRESS_1_ODR_ADDR                     0x20
  49 #define ST_PRESS_1_ODR_MASK                     0x70
  50 #define ST_PRESS_1_ODR_AVL_1HZ_VAL              0x01
  51 #define ST_PRESS_1_ODR_AVL_7HZ_VAL              0x05
  52 #define ST_PRESS_1_ODR_AVL_13HZ_VAL             0x06
  53 #define ST_PRESS_1_ODR_AVL_25HZ_VAL             0x07
  54 #define ST_PRESS_1_PW_ADDR                      0x20
  55 #define ST_PRESS_1_PW_MASK                      0x80
  56 #define ST_PRESS_1_FS_ADDR                      0x23
  57 #define ST_PRESS_1_FS_MASK                      0x30
  58 #define ST_PRESS_1_FS_AVL_1260_VAL              0x00
  59 #define ST_PRESS_1_FS_AVL_1260_GAIN             ST_PRESS_KPASCAL_NANO_SCALE
  60 #define ST_PRESS_1_FS_AVL_TEMP_GAIN             ST_PRESS_CELSIUS_NANO_SCALE
  61 #define ST_PRESS_1_BDU_ADDR                     0x20
  62 #define ST_PRESS_1_BDU_MASK                     0x04
  63 #define ST_PRESS_1_DRDY_IRQ_ADDR                0x22
  64 #define ST_PRESS_1_DRDY_IRQ_INT1_MASK           0x04
  65 #define ST_PRESS_1_DRDY_IRQ_INT2_MASK           0x20
  66 #define ST_PRESS_1_MULTIREAD_BIT                true
  67 #define ST_PRESS_1_TEMP_OFFSET                  42500
  68
  69 static const struct iio_chan_spec st_press_channels[] = {
  70         ST_SENSORS_LSM_CHANNELS(IIO_PRESSURE,
  71                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  72                         ST_SENSORS_SCAN_X, 0, IIO_NO_MOD, 'u', IIO_LE, 24, 24,
  73                         ST_PRESS_DEFAULT_OUT_XL_ADDR),
  74         ST_SENSORS_LSM_CHANNELS(IIO_TEMP,
  75                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
  76                                                 BIT(IIO_CHAN_INFO_OFFSET),
  77                         -1, 0, IIO_NO_MOD, 's', IIO_LE, 16, 16,
  78                         ST_TEMP_DEFAULT_OUT_L_ADDR),
  79         IIO_CHAN_SOFT_TIMESTAMP(1)
  80 };
  81
  82 static const struct st_sensors st_press_sensors[] = {
  83         {
  84                 .wai = ST_PRESS_1_WAI_EXP,
  85                 .sensors_supported = {
  86                         [0] = LPS331AP_PRESS_DEV_NAME,
  87                 },
  88                 .ch = (struct iio_chan_spec *)st_press_channels,
  89                 .odr = {
  90                         .addr = ST_PRESS_1_ODR_ADDR,
  91                         .mask = ST_PRESS_1_ODR_MASK,
  92                         .odr_avl = {
  93                                 { 1, ST_PRESS_1_ODR_AVL_1HZ_VAL, },
  94                                 { 7, ST_PRESS_1_ODR_AVL_7HZ_VAL, },
  95                                 { 13, ST_PRESS_1_ODR_AVL_13HZ_VAL, },
  96                                 { 25, ST_PRESS_1_ODR_AVL_25HZ_VAL, },
  97                         },
  98                 },
  99                 .pw = {
 100                         .addr = ST_PRESS_1_PW_ADDR,
 101                         .mask = ST_PRESS_1_PW_MASK,
 102                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 103                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 104                 },
 105                 .fs = {
 106                         .addr = ST_PRESS_1_FS_ADDR,
 107                         .mask = ST_PRESS_1_FS_MASK,
 108                         .fs_avl = {
 109                                 [0] = {
 110                                         .num = ST_PRESS_FS_AVL_1260MB,
 111                                         .value = ST_PRESS_1_FS_AVL_1260_VAL,
 112                                         .gain = ST_PRESS_1_FS_AVL_1260_GAIN,
 113                                         .gain2 = ST_PRESS_1_FS_AVL_TEMP_GAIN,
 114                                 },
 115                         },
 116                 },
 117                 .bdu = {
 118                         .addr = ST_PRESS_1_BDU_ADDR,
 119                         .mask = ST_PRESS_1_BDU_MASK,
 120                 },
 121                 .drdy_irq = {
 122                         .addr = ST_PRESS_1_DRDY_IRQ_ADDR,
 123                         .mask_int1 = ST_PRESS_1_DRDY_IRQ_INT1_MASK,
 124                         .mask_int2 = ST_PRESS_1_DRDY_IRQ_INT2_MASK,
 125                 },
 126                 .multi_read_bit = ST_PRESS_1_MULTIREAD_BIT,
 127                 .bootime = 2,
 128         },
 129 };
 130
 131 static int st_press_read_raw(struct iio_dev *indio_dev,
 132                         struct iio_chan_spec const *ch, int *val,
 133                                                         int *val2, long mask)
 134 {
 135         int err;
 136         struct st_sensor_data *pdata = iio_priv(indio_dev);
 137
 138         switch (mask) {
 139         case IIO_CHAN_INFO_RAW:
 140                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 141                 if (err < 0)
 142                         goto read_error;
 143
 144                 return IIO_VAL_INT;
 145         case IIO_CHAN_INFO_SCALE:
 146                 *val = 0;
 147
 148                 switch (ch->type) {
 149                 case IIO_PRESSURE:
 150                         *val2 = pdata->current_fullscale->gain;
 151                         break;
 152                 case IIO_TEMP:
 153                         *val2 = pdata->current_fullscale->gain2;
 154                         break;
 155                 default:
 156                         err = -EINVAL;
 157                         goto read_error;
 158                 }
 159
 160                 return IIO_VAL_INT_PLUS_NANO;
 161         case IIO_CHAN_INFO_OFFSET:
 162                 switch (ch->type) {
 163                 case IIO_TEMP:
 164                         *val = 425;
 165                         *val2 = 10;
 166                         break;
 167                 default:
 168                         err = -EINVAL;
 169                         goto read_error;
 170                 }
 171
 172                 return IIO_VAL_FRACTIONAL;
 173         default:
 174                 return -EINVAL;
 175         }
 176
 177 read_error:
 178         return err;
 179 }
 180
 181 static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
 182 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 183
 184 static struct attribute *st_press_attributes[] = {
 185         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 186         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 187         NULL,
 188 };
 189
 190 static const struct attribute_group st_press_attribute_group = {
 191         .attrs = st_press_attributes,
 192 };
 193
 194 static const struct iio_info press_info = {
 195         .driver_module = THIS_MODULE,
 196         .attrs = &st_press_attribute_group,
 197         .read_raw = &st_press_read_raw,
 198 };
 199
 200 #ifdef CONFIG_IIO_TRIGGER
 201 static const struct iio_trigger_ops st_press_trigger_ops = {
 202         .owner = THIS_MODULE,
 203         .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
 204 };
 205 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
 206 #else
 207 #define ST_PRESS_TRIGGER_OPS NULL
 208 #endif
 209
 210 int st_press_common_probe(struct iio_dev *indio_dev,
 211                                 struct st_sensors_platform_data *plat_data)
 212 {
 213         int err;
 214         struct st_sensor_data *pdata = iio_priv(indio_dev);
 215
 216         indio_dev->modes = INDIO_DIRECT_MODE;
 217         indio_dev->info = &press_info;
 218
 219         err = st_sensors_check_device_support(indio_dev,
 220                                 ARRAY_SIZE(st_press_sensors), st_press_sensors);
 221         if (err < 0)
 222                 goto st_press_common_probe_error;
 223
 224         pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
 225         pdata->multiread_bit = pdata->sensor->multi_read_bit;
 226         indio_dev->channels = pdata->sensor->ch;
 227         indio_dev->num_channels = ARRAY_SIZE(st_press_channels);
 228
 229         pdata->current_fullscale = (struct st_sensor_fullscale_avl *)
 230                                                 &pdata->sensor->fs.fs_avl[0];
 231         pdata->odr = pdata->sensor->odr.odr_avl[0].hz;
 232
 233         if (!plat_data)
 234                 plat_data =
 235                         (struct st_sensors_platform_data *)&default_press_pdata;
 236
 237         err = st_sensors_init_sensor(indio_dev, plat_data);
 238         if (err < 0)
 239                 goto st_press_common_probe_error;
 240
 241         if (pdata->get_irq_data_ready(indio_dev) > 0) {
 242                 err = st_press_allocate_ring(indio_dev);
 243                 if (err < 0)
 244                         goto st_press_common_probe_error;
 245
 246                 err = st_sensors_allocate_trigger(indio_dev,
 247                                                         ST_PRESS_TRIGGER_OPS);
 248                 if (err < 0)
 249                         goto st_press_probe_trigger_error;
 250         }
 251
 252         err = iio_device_register(indio_dev);
 253         if (err)
 254                 goto st_press_device_register_error;
 255
 256         return err;
 257
 258 st_press_device_register_error:
 259         if (pdata->get_irq_data_ready(indio_dev) > 0)
 260                 st_sensors_deallocate_trigger(indio_dev);
 261 st_press_probe_trigger_error:
 262         if (pdata->get_irq_data_ready(indio_dev) > 0)
 263                 st_press_deallocate_ring(indio_dev);
 264 st_press_common_probe_error:
 265         return err;
 266 }
 267 EXPORT_SYMBOL(st_press_common_probe);
 268
 269 void st_press_common_remove(struct iio_dev *indio_dev)
 270 {
 271         struct st_sensor_data *pdata = iio_priv(indio_dev);
 272
 273         iio_device_unregister(indio_dev);
 274         if (pdata->get_irq_data_ready(indio_dev) > 0) {
 275                 st_sensors_deallocate_trigger(indio_dev);
 276                 st_press_deallocate_ring(indio_dev);
 277         }
 278 }
 279 EXPORT_SYMBOL(st_press_common_remove);
 280
 281 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 282 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
 283 MODULE_LICENSE("GPL v2");