include/linux/iio/common/st_sensors.h

   1 /*
   2  * STMicroelectronics sensors library 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 #ifndef ST_SENSORS_H
  12 #define ST_SENSORS_H
  13
  14 #include <linux/i2c.h>
  15 #include <linux/spi/spi.h>
  16 #include <linux/irqreturn.h>
  17 #include <linux/iio/trigger.h>
  18
  19 #define ST_SENSORS_TX_MAX_LENGTH                2
  20 #define ST_SENSORS_RX_MAX_LENGTH                6
  21
  22 #define ST_SENSORS_ODR_LIST_MAX                 10
  23 #define ST_SENSORS_FULLSCALE_AVL_MAX            10
  24
  25 #define ST_SENSORS_NUMBER_ALL_CHANNELS          4
  26 #define ST_SENSORS_NUMBER_DATA_CHANNELS         3
  27 #define ST_SENSORS_ENABLE_ALL_AXIS              0x07
  28 #define ST_SENSORS_BYTE_FOR_CHANNEL             2
  29 #define ST_SENSORS_SCAN_X                       0
  30 #define ST_SENSORS_SCAN_Y                       1
  31 #define ST_SENSORS_SCAN_Z                       2
  32 #define ST_SENSORS_DEFAULT_12_REALBITS          12
  33 #define ST_SENSORS_DEFAULT_16_REALBITS          16
  34 #define ST_SENSORS_DEFAULT_POWER_ON_VALUE       0x01
  35 #define ST_SENSORS_DEFAULT_POWER_OFF_VALUE      0x00
  36 #define ST_SENSORS_DEFAULT_WAI_ADDRESS          0x0f
  37 #define ST_SENSORS_DEFAULT_AXIS_ADDR            0x20
  38 #define ST_SENSORS_DEFAULT_AXIS_MASK            0x07
  39 #define ST_SENSORS_DEFAULT_AXIS_N_BIT           3
  40
  41 #define ST_SENSORS_MAX_NAME                     17
  42 #define ST_SENSORS_MAX_4WAI                     7
  43
  44 #define ST_SENSORS_LSM_CHANNELS(device_type, index, mod, endian, bits, addr) \
  45 { \
  46         .type = device_type, \
  47         .modified = 1, \
  48         .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
  49                         IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
  50         .scan_index = index, \
  51         .channel2 = mod, \
  52         .address = addr, \
  53         .scan_type = { \
  54                 .sign = 's', \
  55                 .realbits = bits, \
  56                 .shift = 16 - bits, \
  57                 .storagebits = 16, \
  58                 .endianness = endian, \
  59         }, \
  60 }
  61
  62 #define ST_SENSOR_DEV_ATTR_SAMP_FREQ() \
  63                 IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, \
  64                         st_sensors_sysfs_get_sampling_frequency, \
  65                         st_sensors_sysfs_set_sampling_frequency)
  66
  67 #define ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL() \
  68                 IIO_DEV_ATTR_SAMP_FREQ_AVAIL( \
  69                         st_sensors_sysfs_sampling_frequency_avail)
  70
  71 #define ST_SENSORS_DEV_ATTR_SCALE_AVAIL(name) \
  72                 IIO_DEVICE_ATTR(name, S_IRUGO, \
  73                         st_sensors_sysfs_scale_avail, NULL , 0);
  74
  75 struct st_sensor_odr_avl {
  76         unsigned int hz;
  77         u8 value;
  78 };
  79
  80 struct st_sensor_odr {
  81         u8 addr;
  82         u8 mask;
  83         struct st_sensor_odr_avl odr_avl[ST_SENSORS_ODR_LIST_MAX];
  84 };
  85
  86 struct st_sensor_power {
  87         u8 addr;
  88         u8 mask;
  89         u8 value_off;
  90         u8 value_on;
  91 };
  92
  93 struct st_sensor_axis {
  94         u8 addr;
  95         u8 mask;
  96 };
  97
  98 struct st_sensor_fullscale_avl {
  99         unsigned int num;
 100         u8 value;
 101         unsigned int gain;
 102         unsigned int gain2;
 103 };
 104
 105 struct st_sensor_fullscale {
 106         u8 addr;
 107         u8 mask;
 108         struct st_sensor_fullscale_avl fs_avl[ST_SENSORS_FULLSCALE_AVL_MAX];
 109 };
 110
 111 /**
 112  * struct st_sensor_bdu - ST sensor device block data update
 113  * @addr: address of the register.
 114  * @mask: mask to write the block data update flag.
 115  */
 116 struct st_sensor_bdu {
 117         u8 addr;
 118         u8 mask;
 119 };
 120
 121 /**
 122  * struct st_sensor_data_ready_irq - ST sensor device data-ready interrupt
 123  * @addr: address of the register.
 124  * @mask: mask to write the on/off value.
 125  * struct ig1 - represents the Interrupt Generator 1 of sensors.
 126  * @en_addr: address of the enable ig1 register.
 127  * @en_mask: mask to write the on/off value for enable.
 128  */
 129 struct st_sensor_data_ready_irq {
 130         u8 addr;
 131         u8 mask;
 132         struct {
 133                 u8 en_addr;
 134                 u8 en_mask;
 135         } ig1;
 136 };
 137
 138 /**
 139  * struct st_sensor_transfer_buffer - ST sensor device I/O buffer
 140  * @buf_lock: Mutex to protect rx and tx buffers.
 141  * @tx_buf: Buffer used by SPI transfer function to send data to the sensors.
 142  *      This buffer is used to avoid DMA not-aligned issue.
 143  * @rx_buf: Buffer used by SPI transfer to receive data from sensors.
 144  *      This buffer is used to avoid DMA not-aligned issue.
 145  */
 146 struct st_sensor_transfer_buffer {
 147         struct mutex buf_lock;
 148         u8 rx_buf[ST_SENSORS_RX_MAX_LENGTH];
 149         u8 tx_buf[ST_SENSORS_TX_MAX_LENGTH] ____cacheline_aligned;
 150 };
 151
 152 /**
 153  * struct st_sensor_transfer_function - ST sensor device I/O function
 154  * @read_byte: Function used to read one byte.
 155  * @write_byte: Function used to write one byte.
 156  * @read_multiple_byte: Function used to read multiple byte.
 157  */
 158 struct st_sensor_transfer_function {
 159         int (*read_byte) (struct st_sensor_transfer_buffer *tb,
 160                                 struct device *dev, u8 reg_addr, u8 *res_byte);
 161         int (*write_byte) (struct st_sensor_transfer_buffer *tb,
 162                                 struct device *dev, u8 reg_addr, u8 data);
 163         int (*read_multiple_byte) (struct st_sensor_transfer_buffer *tb,
 164                 struct device *dev, u8 reg_addr, int len, u8 *data,
 165                                                         bool multiread_bit);
 166 };
 167
 168 /**
 169  * struct st_sensors - ST sensors list
 170  * @wai: Contents of WhoAmI register.
 171  * @sensors_supported: List of supported sensors by struct itself.
 172  * @ch: IIO channels for the sensor.
 173  * @odr: Output data rate register and ODR list available.
 174  * @pw: Power register of the sensor.
 175  * @enable_axis: Enable one or more axis of the sensor.
 176  * @fs: Full scale register and full scale list available.
 177  * @bdu: Block data update register.
 178  * @drdy_irq: Data ready register of the sensor.
 179  * @multi_read_bit: Use or not particular bit for [I2C/SPI] multi-read.
 180  * @bootime: samples to discard when sensor passing from power-down to power-up.
 181  */
 182 struct st_sensors {
 183         u8 wai;
 184         char sensors_supported[ST_SENSORS_MAX_4WAI][ST_SENSORS_MAX_NAME];
 185         struct iio_chan_spec *ch;
 186         struct st_sensor_odr odr;
 187         struct st_sensor_power pw;
 188         struct st_sensor_axis enable_axis;
 189         struct st_sensor_fullscale fs;
 190         struct st_sensor_bdu bdu;
 191         struct st_sensor_data_ready_irq drdy_irq;
 192         bool multi_read_bit;
 193         unsigned int bootime;
 194 };
 195
 196 /**
 197  * struct st_sensor_data - ST sensor device status
 198  * @dev: Pointer to instance of struct device (I2C or SPI).
 199  * @trig: The trigger in use by the core driver.
 200  * @sensor: Pointer to the current sensor struct in use.
 201  * @current_fullscale: Maximum range of measure by the sensor.
 202  * @enabled: Status of the sensor (false->off, true->on).
 203  * @multiread_bit: Use or not particular bit for [I2C/SPI] multiread.
 204  * @buffer_data: Data used by buffer part.
 205  * @odr: Output data rate of the sensor [Hz].
 206  * @get_irq_data_ready: Function to get the IRQ used for data ready signal.
 207  * @tf: Transfer function structure used by I/O operations.
 208  * @tb: Transfer buffers and mutex used by I/O operations.
 209  */
 210 struct st_sensor_data {
 211         struct device *dev;
 212         struct iio_trigger *trig;
 213         struct st_sensors *sensor;
 214         struct st_sensor_fullscale_avl *current_fullscale;
 215
 216         bool enabled;
 217         bool multiread_bit;
 218
 219         char *buffer_data;
 220
 221         unsigned int odr;
 222
 223         unsigned int (*get_irq_data_ready) (struct iio_dev *indio_dev);
 224
 225         const struct st_sensor_transfer_function *tf;
 226         struct st_sensor_transfer_buffer tb;
 227 };
 228
 229 #ifdef CONFIG_IIO_BUFFER
 230 int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
 231                                 const struct iio_trigger_ops *trigger_ops);
 232
 233 void st_sensors_deallocate_trigger(struct iio_dev *indio_dev);
 234
 235 irqreturn_t st_sensors_trigger_handler(int irq, void *p);
 236
 237 int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf);
 238 #endif
 239
 240 int st_sensors_init_sensor(struct iio_dev *indio_dev);
 241
 242 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable);
 243
 244 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable);
 245
 246 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr);
 247
 248 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable);
 249
 250 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale);
 251
 252 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
 253                                 struct iio_chan_spec const *ch, int *val);
 254
 255 int st_sensors_check_device_support(struct iio_dev *indio_dev,
 256                         int num_sensors_list, const struct st_sensors *sensors);
 257
 258 ssize_t st_sensors_sysfs_get_sampling_frequency(struct device *dev,
 259                                 struct device_attribute *attr, char *buf);
 260
 261 ssize_t st_sensors_sysfs_set_sampling_frequency(struct device *dev,
 262                 struct device_attribute *attr, const char *buf, size_t size);
 263
 264 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
 265                                 struct device_attribute *attr, char *buf);
 266
 267 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
 268                                 struct device_attribute *attr, char *buf);
 269
 270 #endif /* ST_SENSORS_H */