drivers/iio/magnetometer/hmc5843_spi.c

   1 /*
   2  * SPI driver for hmc5983
   3  *
   4  * Copyright (C) Josef Gajdusek <atx@atx.name>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/spi/spi.h>
  13 #include <linux/iio/iio.h>
  14
  15 #include "hmc5843.h"
  16
  17 static const struct regmap_range hmc5843_readable_ranges[] = {
  18                 regmap_reg_range(0, HMC5843_ID_END),
  19 };
  20
  21 static const struct regmap_access_table hmc5843_readable_table = {
  22                 .yes_ranges = hmc5843_readable_ranges,
  23                 .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges),
  24 };
  25
  26 static const struct regmap_range hmc5843_writable_ranges[] = {
  27                 regmap_reg_range(0, HMC5843_MODE_REG),
  28 };
  29
  30 static const struct regmap_access_table hmc5843_writable_table = {
  31                 .yes_ranges = hmc5843_writable_ranges,
  32                 .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges),
  33 };
  34
  35 static const struct regmap_range hmc5843_volatile_ranges[] = {
  36                 regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG),
  37 };
  38
  39 static const struct regmap_access_table hmc5843_volatile_table = {
  40                 .yes_ranges = hmc5843_volatile_ranges,
  41                 .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges),
  42 };
  43
  44 static const struct regmap_config hmc5843_spi_regmap_config = {
  45                 .reg_bits = 8,
  46                 .val_bits = 8,
  47
  48                 .rd_table = &hmc5843_readable_table,
  49                 .wr_table = &hmc5843_writable_table,
  50                 .volatile_table = &hmc5843_volatile_table,
  51
  52                 /* Autoincrement address pointer */
  53                 .read_flag_mask = 0xc0,
  54
  55                 .cache_type = REGCACHE_RBTREE,
  56 };
  57
  58 static int hmc5843_spi_probe(struct spi_device *spi)
  59 {
  60         int ret;
  61         struct regmap *regmap;
  62         const struct spi_device_id *id = spi_get_device_id(spi);
  63
  64         spi->mode = SPI_MODE_3;
  65         spi->max_speed_hz = 8000000;
  66         spi->bits_per_word = 8;
  67         ret = spi_setup(spi);
  68         if (ret)
  69                 return ret;
  70
  71         regmap = devm_regmap_init_spi(spi, &hmc5843_spi_regmap_config);
  72         if (IS_ERR(regmap))
  73                 return PTR_ERR(regmap);
  74
  75         return hmc5843_common_probe(&spi->dev,
  76                         regmap,
  77                         id->driver_data, id->name);
  78 }
  79
  80 static int hmc5843_spi_remove(struct spi_device *spi)
  81 {
  82         return hmc5843_common_remove(&spi->dev);
  83 }
  84
  85 static const struct spi_device_id hmc5843_id[] = {
  86         { "hmc5983", HMC5983_ID },
  87         { }
  88 };
  89 MODULE_DEVICE_TABLE(spi, hmc5843_id);
  90
  91 static struct spi_driver hmc5843_driver = {
  92                 .driver = {
  93                                 .name = "hmc5843",
  94                                 .pm = HMC5843_PM_OPS,
  95                 },
  96                 .id_table = hmc5843_id,
  97                 .probe = hmc5843_spi_probe,
  98                 .remove = hmc5843_spi_remove,
  99 };
 100
 101 module_spi_driver(hmc5843_driver);
 102
 103 MODULE_AUTHOR("Josef Gajdusek <atx@atx.name>");
 104 MODULE_DESCRIPTION("HMC5983 SPI driver");
 105 MODULE_LICENSE("GPL");