drivers/iio/magnetometer/hmc5843_spi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * SPI driver for hmc5983
   4  *
   5  * Copyright (C) Josef Gajdusek <atx@atx.name>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/spi/spi.h>
  10 #include <linux/iio/iio.h>
  11
  12 #include "hmc5843.h"
  13
  14 static const struct regmap_range hmc5843_readable_ranges[] = {
  15                 regmap_reg_range(0, HMC5843_ID_END),
  16 };
  17
  18 static const struct regmap_access_table hmc5843_readable_table = {
  19                 .yes_ranges = hmc5843_readable_ranges,
  20                 .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges),
  21 };
  22
  23 static const struct regmap_range hmc5843_writable_ranges[] = {
  24                 regmap_reg_range(0, HMC5843_MODE_REG),
  25 };
  26
  27 static const struct regmap_access_table hmc5843_writable_table = {
  28                 .yes_ranges = hmc5843_writable_ranges,
  29                 .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges),
  30 };
  31
  32 static const struct regmap_range hmc5843_volatile_ranges[] = {
  33                 regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG),
  34 };
  35
  36 static const struct regmap_access_table hmc5843_volatile_table = {
  37                 .yes_ranges = hmc5843_volatile_ranges,
  38                 .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges),
  39 };
  40
  41 static const struct regmap_config hmc5843_spi_regmap_config = {
  42                 .reg_bits = 8,
  43                 .val_bits = 8,
  44
  45                 .rd_table = &hmc5843_readable_table,
  46                 .wr_table = &hmc5843_writable_table,
  47                 .volatile_table = &hmc5843_volatile_table,
  48
  49                 /* Autoincrement address pointer */
  50                 .read_flag_mask = 0xc0,
  51
  52                 .cache_type = REGCACHE_RBTREE,
  53 };
  54
  55 static int hmc5843_spi_probe(struct spi_device *spi)
  56 {
  57         int ret;
  58         struct regmap *regmap;
  59         const struct spi_device_id *id = spi_get_device_id(spi);
  60
  61         spi->mode = SPI_MODE_3;
  62         spi->max_speed_hz = 8000000;
  63         spi->bits_per_word = 8;
  64         ret = spi_setup(spi);
  65         if (ret)
  66                 return ret;
  67
  68         regmap = devm_regmap_init_spi(spi, &hmc5843_spi_regmap_config);
  69         if (IS_ERR(regmap))
  70                 return PTR_ERR(regmap);
  71
  72         return hmc5843_common_probe(&spi->dev,
  73                         regmap,
  74                         id->driver_data, id->name);
  75 }
  76
  77 static void hmc5843_spi_remove(struct spi_device *spi)
  78 {
  79         hmc5843_common_remove(&spi->dev);
  80 }
  81
  82 static const struct spi_device_id hmc5843_id[] = {
  83         { "hmc5983", HMC5983_ID },
  84         { }
  85 };
  86 MODULE_DEVICE_TABLE(spi, hmc5843_id);
  87
  88 static struct spi_driver hmc5843_driver = {
  89         .driver = {
  90                 .name = "hmc5843",
  91                 .pm = pm_sleep_ptr(&hmc5843_pm_ops),
  92         },
  93         .id_table = hmc5843_id,
  94         .probe = hmc5843_spi_probe,
  95         .remove = hmc5843_spi_remove,
  96 };
  97
  98 module_spi_driver(hmc5843_driver);
  99
 100 MODULE_AUTHOR("Josef Gajdusek <atx@atx.name>");
 101 MODULE_DESCRIPTION("HMC5983 SPI driver");
 102 MODULE_LICENSE("GPL");
 103 MODULE_IMPORT_NS(IIO_HMC5843);