include/linux/iio/imu/adis.h

   1 /*
   2  * Common library for ADIS16XXX devices
   3  *
   4  * Copyright 2012 Analog Devices Inc.
   5  *   Author: Lars-Peter Clausen <lars@metafoo.de>
   6  *
   7  * Licensed under the GPL-2 or later.
   8  */
   9
  10 #ifndef __IIO_ADIS_H__
  11 #define __IIO_ADIS_H__
  12
  13 #include <linux/spi/spi.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/iio/types.h>
  16
  17 #define ADIS_WRITE_REG(reg) ((0x80 | (reg)))
  18 #define ADIS_READ_REG(reg) ((reg) & 0x7f)
  19
  20 #define ADIS_PAGE_SIZE 0x80
  21 #define ADIS_REG_PAGE_ID 0x00
  22
  23 struct adis;
  24
  25 /**
  26  * struct adis_data - ADIS chip variant specific data
  27  * @read_delay: SPI delay for read operations in us
  28  * @write_delay: SPI delay for write operations in us
  29  * @glob_cmd_reg: Register address of the GLOB_CMD register
  30  * @msc_ctrl_reg: Register address of the MSC_CTRL register
  31  * @diag_stat_reg: Register address of the DIAG_STAT register
  32  * @status_error_msgs: Array of error messgaes
  33  * @status_error_mask:
  34  */
  35 struct adis_data {
  36         unsigned int read_delay;
  37         unsigned int write_delay;
  38
  39         unsigned int glob_cmd_reg;
  40         unsigned int msc_ctrl_reg;
  41         unsigned int diag_stat_reg;
  42
  43         unsigned int self_test_mask;
  44         unsigned int startup_delay;
  45
  46         const char * const *status_error_msgs;
  47         unsigned int status_error_mask;
  48
  49         int (*enable_irq)(struct adis *adis, bool enable);
  50
  51         bool has_paging;
  52 };
  53
  54 struct adis {
  55         struct spi_device       *spi;
  56         struct iio_trigger      *trig;
  57
  58         const struct adis_data  *data;
  59
  60         struct mutex            txrx_lock;
  61         struct spi_message      msg;
  62         struct spi_transfer     *xfer;
  63         unsigned int            current_page;
  64         void                    *buffer;
  65
  66         uint8_t                 tx[10] ____cacheline_aligned;
  67         uint8_t                 rx[4];
  68 };
  69
  70 int adis_init(struct adis *adis, struct iio_dev *indio_dev,
  71         struct spi_device *spi, const struct adis_data *data);
  72 int adis_reset(struct adis *adis);
  73
  74 int adis_write_reg(struct adis *adis, unsigned int reg,
  75         unsigned int val, unsigned int size);
  76 int adis_read_reg(struct adis *adis, unsigned int reg,
  77         unsigned int *val, unsigned int size);
  78
  79 /**
  80  * adis_write_reg_8() - Write single byte to a register
  81  * @adis: The adis device
  82  * @reg: The address of the register to be written
  83  * @value: The value to write
  84  */
  85 static inline int adis_write_reg_8(struct adis *adis, unsigned int reg,
  86         uint8_t val)
  87 {
  88         return adis_write_reg(adis, reg, val, 1);
  89 }
  90
  91 /**
  92  * adis_write_reg_16() - Write 2 bytes to a pair of registers
  93  * @adis: The adis device
  94  * @reg: The address of the lower of the two registers
  95  * @value: Value to be written
  96  */
  97 static inline int adis_write_reg_16(struct adis *adis, unsigned int reg,
  98         uint16_t val)
  99 {
 100         return adis_write_reg(adis, reg, val, 2);
 101 }
 102
 103 /**
 104  * adis_write_reg_32() - write 4 bytes to four registers
 105  * @adis: The adis device
 106  * @reg: The address of the lower of the four register
 107  * @value: Value to be written
 108  */
 109 static inline int adis_write_reg_32(struct adis *adis, unsigned int reg,
 110         uint32_t val)
 111 {
 112         return adis_write_reg(adis, reg, val, 4);
 113 }
 114
 115 /**
 116  * adis_read_reg_16() - read 2 bytes from a 16-bit register
 117  * @adis: The adis device
 118  * @reg: The address of the lower of the two registers
 119  * @val: The value read back from the device
 120  */
 121 static inline int adis_read_reg_16(struct adis *adis, unsigned int reg,
 122         uint16_t *val)
 123 {
 124         unsigned int tmp;
 125         int ret;
 126
 127         ret = adis_read_reg(adis, reg, &tmp, 2);
 128         *val = tmp;
 129
 130         return ret;
 131 }
 132
 133 /**
 134  * adis_read_reg_32() - read 4 bytes from a 32-bit register
 135  * @adis: The adis device
 136  * @reg: The address of the lower of the two registers
 137  * @val: The value read back from the device
 138  */
 139 static inline int adis_read_reg_32(struct adis *adis, unsigned int reg,
 140         uint32_t *val)
 141 {
 142         unsigned int tmp;
 143         int ret;
 144
 145         ret = adis_read_reg(adis, reg, &tmp, 4);
 146         *val = tmp;
 147
 148         return ret;
 149 }
 150
 151 int adis_enable_irq(struct adis *adis, bool enable);
 152 int adis_check_status(struct adis *adis);
 153
 154 int adis_initial_startup(struct adis *adis);
 155
 156 int adis_single_conversion(struct iio_dev *indio_dev,
 157         const struct iio_chan_spec *chan, unsigned int error_mask,
 158         int *val);
 159
 160 #define ADIS_VOLTAGE_CHAN(addr, si, chan, name, bits) { \
 161         .type = IIO_VOLTAGE, \
 162         .indexed = 1, \
 163         .channel = (chan), \
 164         .extend_name = name, \
 165         .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
 166                 IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
 167         .address = (addr), \
 168         .scan_index = (si), \
 169         .scan_type = { \
 170                 .sign = 'u', \
 171                 .realbits = (bits), \
 172                 .storagebits = 16, \
 173                 .endianness = IIO_BE, \
 174         }, \
 175 }
 176
 177 #define ADIS_SUPPLY_CHAN(addr, si, bits) \
 178         ADIS_VOLTAGE_CHAN(addr, si, 0, "supply", bits)
 179
 180 #define ADIS_AUX_ADC_CHAN(addr, si, bits) \
 181         ADIS_VOLTAGE_CHAN(addr, si, 1, NULL, bits)
 182
 183 #define ADIS_TEMP_CHAN(addr, si, bits) { \
 184         .type = IIO_TEMP, \
 185         .indexed = 1, \
 186         .channel = 0, \
 187         .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
 188                 IIO_CHAN_INFO_SCALE_SEPARATE_BIT | \
 189                 IIO_CHAN_INFO_OFFSET_SEPARATE_BIT, \
 190         .address = (addr), \
 191         .scan_index = (si), \
 192         .scan_type = { \
 193                 .sign = 'u', \
 194                 .realbits = (bits), \
 195                 .storagebits = 16, \
 196                 .endianness = IIO_BE, \
 197         }, \
 198 }
 199
 200 #define ADIS_MOD_CHAN(_type, mod, addr, si, info, bits) { \
 201         .type = (_type), \
 202         .modified = 1, \
 203         .channel2 = IIO_MOD_ ## mod, \
 204         .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
 205                  IIO_CHAN_INFO_SCALE_SHARED_BIT | \
 206                  info, \
 207         .address = (addr), \
 208         .scan_index = (si), \
 209         .scan_type = { \
 210                 .sign = 's', \
 211                 .realbits = (bits), \
 212                 .storagebits = 16, \
 213                 .endianness = IIO_BE, \
 214         }, \
 215 }
 216
 217 #define ADIS_ACCEL_CHAN(mod, addr, si, info, bits) \
 218         ADIS_MOD_CHAN(IIO_ACCEL, mod, addr, si, info, bits)
 219
 220 #define ADIS_GYRO_CHAN(mod, addr, si, info, bits) \
 221         ADIS_MOD_CHAN(IIO_ANGL_VEL, mod, addr, si, info, bits)
 222
 223 #define ADIS_INCLI_CHAN(mod, addr, si, info, bits) \
 224         ADIS_MOD_CHAN(IIO_INCLI, mod, addr, si, info, bits)
 225
 226 #define ADIS_ROT_CHAN(mod, addr, si, info, bits) \
 227         ADIS_MOD_CHAN(IIO_ROT, mod, addr, si, info, bits)
 228
 229 #ifdef CONFIG_IIO_ADIS_LIB_BUFFER
 230
 231 int adis_setup_buffer_and_trigger(struct adis *adis,
 232         struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *));
 233 void adis_cleanup_buffer_and_trigger(struct adis *adis,
 234         struct iio_dev *indio_dev);
 235
 236 int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev);
 237 void adis_remove_trigger(struct adis *adis);
 238
 239 int adis_update_scan_mode(struct iio_dev *indio_dev,
 240         const unsigned long *scan_mask);
 241
 242 #else /* CONFIG_IIO_BUFFER */
 243
 244 static inline int adis_setup_buffer_and_trigger(struct adis *adis,
 245         struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *))
 246 {
 247         return 0;
 248 }
 249
 250 static inline void adis_cleanup_buffer_and_trigger(struct adis *adis,
 251         struct iio_dev *indio_dev)
 252 {
 253 }
 254
 255 static inline int adis_probe_trigger(struct adis *adis,
 256         struct iio_dev *indio_dev)
 257 {
 258         return 0;
 259 }
 260
 261 static inline void adis_remove_trigger(struct adis *adis)
 262 {
 263 }
 264
 265 #define adis_update_scan_mode NULL
 266
 267 #endif /* CONFIG_IIO_BUFFER */
 268
 269 #ifdef CONFIG_DEBUG_FS
 270
 271 int adis_debugfs_reg_access(struct iio_dev *indio_dev,
 272         unsigned int reg, unsigned int writeval, unsigned int *readval);
 273
 274 #else
 275
 276 #define adis_debugfs_reg_access NULL
 277
 278 #endif
 279
 280 #endif