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