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 #include <linux/bitops.h>
  19 #include <linux/regulator/consumer.h>
  20
  21 #include <linux/platform_data/st_sensors_pdata.h>
  22
  23 #define ST_SENSORS_TX_MAX_LENGTH                2
  24 #define ST_SENSORS_RX_MAX_LENGTH                6
  25
  26 #define ST_SENSORS_ODR_LIST_MAX                 10
  27 #define ST_SENSORS_FULLSCALE_AVL_MAX            10
  28
  29 #define ST_SENSORS_NUMBER_ALL_CHANNELS          4
  30 #define ST_SENSORS_ENABLE_ALL_AXIS              0x07
  31 #define ST_SENSORS_SCAN_X                       0
  32 #define ST_SENSORS_SCAN_Y                       1
  33 #define ST_SENSORS_SCAN_Z                       2
  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 #define ST_SENSORS_DEFAULT_STAT_ADDR            0x27
  41
  42 #define ST_SENSORS_MAX_NAME                     17
  43 #define ST_SENSORS_MAX_4WAI                     7
  44
  45 #define ST_SENSORS_LSM_CHANNELS(device_type, mask, index, mod, \
  46                                         ch2, s, endian, rbits, sbits, addr) \
  47 { \
  48         .type = device_type, \
  49         .modified = mod, \
  50         .info_mask_separate = mask, \
  51         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
  52         .scan_index = index, \
  53         .channel2 = ch2, \
  54         .address = addr, \
  55         .scan_type = { \
  56                 .sign = s, \
  57                 .realbits = rbits, \
  58                 .shift = sbits - rbits, \
  59                 .storagebits = sbits, \
  60                 .endianness = endian, \
  61         }, \
  62 }
  63
  64 #define ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL() \
  65                 IIO_DEV_ATTR_SAMP_FREQ_AVAIL( \
  66                         st_sensors_sysfs_sampling_frequency_avail)
  67
  68 #define ST_SENSORS_DEV_ATTR_SCALE_AVAIL(name) \
  69                 IIO_DEVICE_ATTR(name, S_IRUGO, \
  70                         st_sensors_sysfs_scale_avail, NULL , 0);
  71
  72 struct st_sensor_odr_avl {
  73         unsigned int hz;
  74         u8 value;
  75 };
  76
  77 struct st_sensor_odr {
  78         u8 addr;
  79         u8 mask;
  80         struct st_sensor_odr_avl odr_avl[ST_SENSORS_ODR_LIST_MAX];
  81 };
  82
  83 struct st_sensor_power {
  84         u8 addr;
  85         u8 mask;
  86         u8 value_off;
  87         u8 value_on;
  88 };
  89
  90 struct st_sensor_axis {
  91         u8 addr;
  92         u8 mask;
  93 };
  94
  95 struct st_sensor_fullscale_avl {
  96         unsigned int num;
  97         u8 value;
  98         unsigned int gain;
  99         unsigned int gain2;
 100 };
 101
 102 struct st_sensor_fullscale {
 103         u8 addr;
 104         u8 mask;
 105         struct st_sensor_fullscale_avl fs_avl[ST_SENSORS_FULLSCALE_AVL_MAX];
 106 };
 107
 108 /**
 109  * struct st_sensor_bdu - ST sensor device block data update
 110  * @addr: address of the register.
 111  * @mask: mask to write the block data update flag.
 112  */
 113 struct st_sensor_bdu {
 114         u8 addr;
 115         u8 mask;
 116 };
 117
 118 /**
 119  * struct st_sensor_das - ST sensor device data alignment selection
 120  * @addr: address of the register.
 121  * @mask: mask to write the das flag for left alignment.
 122  */
 123 struct st_sensor_das {
 124         u8 addr;
 125         u8 mask;
 126 };
 127
 128 /**
 129  * struct st_sensor_data_ready_irq - ST sensor device data-ready interrupt
 130  * @addr: address of the register.
 131  * @mask_int1: mask to enable/disable IRQ on INT1 pin.
 132  * @mask_int2: mask to enable/disable IRQ on INT2 pin.
 133  * @addr_ihl: address to enable/disable active low on the INT lines.
 134  * @mask_ihl: mask to enable/disable active low on the INT lines.
 135  * @addr_od: address to enable/disable Open Drain on the INT lines.
 136  * @mask_od: mask to enable/disable Open Drain on the INT lines.
 137  * @addr_stat_drdy: address to read status of DRDY (data ready) interrupt
 138  * struct ig1 - represents the Interrupt Generator 1 of sensors.
 139  * @en_addr: address of the enable ig1 register.
 140  * @en_mask: mask to write the on/off value for enable.
 141  */
 142 struct st_sensor_data_ready_irq {
 143         u8 addr;
 144         u8 mask_int1;
 145         u8 mask_int2;
 146         u8 addr_ihl;
 147         u8 mask_ihl;
 148         u8 addr_od;
 149         u8 mask_od;
 150         u8 addr_stat_drdy;
 151         struct {
 152                 u8 en_addr;
 153                 u8 en_mask;
 154         } ig1;
 155 };
 156
 157 /**
 158  * struct st_sensor_transfer_buffer - ST sensor device I/O buffer
 159  * @buf_lock: Mutex to protect rx and tx buffers.
 160  * @tx_buf: Buffer used by SPI transfer function to send data to the sensors.
 161  *      This buffer is used to avoid DMA not-aligned issue.
 162  * @rx_buf: Buffer used by SPI transfer to receive data from sensors.
 163  *      This buffer is used to avoid DMA not-aligned issue.
 164  */
 165 struct st_sensor_transfer_buffer {
 166         struct mutex buf_lock;
 167         u8 rx_buf[ST_SENSORS_RX_MAX_LENGTH];
 168         u8 tx_buf[ST_SENSORS_TX_MAX_LENGTH] ____cacheline_aligned;
 169 };
 170
 171 /**
 172  * struct st_sensor_transfer_function - ST sensor device I/O function
 173  * @read_byte: Function used to read one byte.
 174  * @write_byte: Function used to write one byte.
 175  * @read_multiple_byte: Function used to read multiple byte.
 176  */
 177 struct st_sensor_transfer_function {
 178         int (*read_byte) (struct st_sensor_transfer_buffer *tb,
 179                                 struct device *dev, u8 reg_addr, u8 *res_byte);
 180         int (*write_byte) (struct st_sensor_transfer_buffer *tb,
 181                                 struct device *dev, u8 reg_addr, u8 data);
 182         int (*read_multiple_byte) (struct st_sensor_transfer_buffer *tb,
 183                 struct device *dev, u8 reg_addr, int len, u8 *data,
 184                                                         bool multiread_bit);
 185 };
 186
 187 /**
 188  * struct st_sensor_settings - ST specific sensor settings
 189  * @wai: Contents of WhoAmI register.
 190  * @wai_addr: The address of WhoAmI register.
 191  * @sensors_supported: List of supported sensors by struct itself.
 192  * @ch: IIO channels for the sensor.
 193  * @odr: Output data rate register and ODR list available.
 194  * @pw: Power register of the sensor.
 195  * @enable_axis: Enable one or more axis of the sensor.
 196  * @fs: Full scale register and full scale list available.
 197  * @bdu: Block data update register.
 198  * @das: Data Alignment Selection register.
 199  * @drdy_irq: Data ready register of the sensor.
 200  * @multi_read_bit: Use or not particular bit for [I2C/SPI] multi-read.
 201  * @bootime: samples to discard when sensor passing from power-down to power-up.
 202  */
 203 struct st_sensor_settings {
 204         u8 wai;
 205         u8 wai_addr;
 206         char sensors_supported[ST_SENSORS_MAX_4WAI][ST_SENSORS_MAX_NAME];
 207         struct iio_chan_spec *ch;
 208         int num_ch;
 209         struct st_sensor_odr odr;
 210         struct st_sensor_power pw;
 211         struct st_sensor_axis enable_axis;
 212         struct st_sensor_fullscale fs;
 213         struct st_sensor_bdu bdu;
 214         struct st_sensor_das das;
 215         struct st_sensor_data_ready_irq drdy_irq;
 216         bool multi_read_bit;
 217         unsigned int bootime;
 218 };
 219
 220 /**
 221  * struct st_sensor_data - ST sensor device status
 222  * @dev: Pointer to instance of struct device (I2C or SPI).
 223  * @trig: The trigger in use by the core driver.
 224  * @sensor_settings: Pointer to the specific sensor settings in use.
 225  * @current_fullscale: Maximum range of measure by the sensor.
 226  * @vdd: Pointer to sensor's Vdd power supply
 227  * @vdd_io: Pointer to sensor's Vdd-IO power supply
 228  * @enabled: Status of the sensor (false->off, true->on).
 229  * @multiread_bit: Use or not particular bit for [I2C/SPI] multiread.
 230  * @buffer_data: Data used by buffer part.
 231  * @odr: Output data rate of the sensor [Hz].
 232  * num_data_channels: Number of data channels used in buffer.
 233  * @drdy_int_pin: Redirect DRDY on pin 1 (1) or pin 2 (2).
 234  * @int_pin_open_drain: Set the interrupt/DRDY to open drain.
 235  * @get_irq_data_ready: Function to get the IRQ used for data ready signal.
 236  * @tf: Transfer function structure used by I/O operations.
 237  * @tb: Transfer buffers and mutex used by I/O operations.
 238  * @edge_irq: the IRQ triggers on edges and need special handling.
 239  * @hw_irq_trigger: if we're using the hardware interrupt on the sensor.
 240  * @hw_timestamp: Latest timestamp from the interrupt handler, when in use.
 241  */
 242 struct st_sensor_data {
 243         struct device *dev;
 244         struct iio_trigger *trig;
 245         struct st_sensor_settings *sensor_settings;
 246         struct st_sensor_fullscale_avl *current_fullscale;
 247         struct regulator *vdd;
 248         struct regulator *vdd_io;
 249
 250         bool enabled;
 251         bool multiread_bit;
 252
 253         char *buffer_data;
 254
 255         unsigned int odr;
 256         unsigned int num_data_channels;
 257
 258         u8 drdy_int_pin;
 259         bool int_pin_open_drain;
 260
 261         unsigned int (*get_irq_data_ready) (struct iio_dev *indio_dev);
 262
 263         const struct st_sensor_transfer_function *tf;
 264         struct st_sensor_transfer_buffer tb;
 265
 266         bool edge_irq;
 267         bool hw_irq_trigger;
 268         s64 hw_timestamp;
 269 };
 270
 271 #ifdef CONFIG_IIO_BUFFER
 272 irqreturn_t st_sensors_trigger_handler(int irq, void *p);
 273 #endif
 274
 275 #ifdef CONFIG_IIO_TRIGGER
 276 int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
 277                                 const struct iio_trigger_ops *trigger_ops);
 278
 279 void st_sensors_deallocate_trigger(struct iio_dev *indio_dev);
 280 int st_sensors_validate_device(struct iio_trigger *trig,
 281                                struct iio_dev *indio_dev);
 282 #else
 283 static inline int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
 284                                 const struct iio_trigger_ops *trigger_ops)
 285 {
 286         return 0;
 287 }
 288 static inline void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
 289 {
 290         return;
 291 }
 292 #define st_sensors_validate_device NULL
 293 #endif
 294
 295 int st_sensors_init_sensor(struct iio_dev *indio_dev,
 296                                         struct st_sensors_platform_data *pdata);
 297
 298 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable);
 299
 300 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable);
 301
 302 int st_sensors_power_enable(struct iio_dev *indio_dev);
 303
 304 void st_sensors_power_disable(struct iio_dev *indio_dev);
 305
 306 int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
 307                                   unsigned reg, unsigned writeval,
 308                                   unsigned *readval);
 309
 310 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr);
 311
 312 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable);
 313
 314 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale);
 315
 316 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
 317                                 struct iio_chan_spec const *ch, int *val);
 318
 319 int st_sensors_check_device_support(struct iio_dev *indio_dev,
 320         int num_sensors_list, const struct st_sensor_settings *sensor_settings);
 321
 322 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
 323                                 struct device_attribute *attr, char *buf);
 324
 325 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
 326                                 struct device_attribute *attr, char *buf);
 327
 328 #endif /* ST_SENSORS_H */