LXR linux/drivers/iio/magnetometer/hmc5843

   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
  17static const struct regmap_range hmc5843_readable_ranges[] = {
  18                regmap_reg_range(0, HMC5843_ID_END),
  19};
  20
  21static 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
  26static const struct regmap_range hmc5843_writable_ranges[] = {
  27                regmap_reg_range(0, HMC5843_MODE_REG),
  28};
  29
  30static 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
  35static const struct regmap_range hmc5843_volatile_ranges[] = {
  36                regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG),
  37};
  38
  39static 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
  44static 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
  58static int hmc5843_spi_probe(struct spi_device *spi)
  59{
  60        int ret;
  61        const struct spi_device_id *id = spi_get_device_id(spi);
  62
  63        spi->mode = SPI_MODE_3;
  64        spi->max_speed_hz = 8000000;
  65        spi->bits_per_word = 8;
  66        ret = spi_setup(spi);
  67        if (ret)
  68                return ret;
  69
  70        return hmc5843_common_probe(&spi->dev,
  71                        devm_regmap_init_spi(spi, &hmc5843_spi_regmap_config),
  72                        id->driver_data, id->name);
  73}
  74
  75static int hmc5843_spi_remove(struct spi_device *spi)
  76{
  77        return hmc5843_common_remove(&spi->dev);
  78}
  79
  80static const struct spi_device_id hmc5843_id[] = {
  81        { "hmc5983", HMC5983_ID },
  82        { }
  83};
  84MODULE_DEVICE_TABLE(spi, hmc5843_id);
  85
  86static struct spi_driver hmc5843_driver = {
  87                .driver = {
  88                                .name = "hmc5843",
  89                                .pm = HMC5843_PM_OPS,
  90                },
  91                .id_table = hmc5843_id,
  92                .probe = hmc5843_spi_probe,
  93                .remove = hmc5843_spi_remove,
  94};
  95
  96module_spi_driver(hmc5843_driver);
  97
  98MODULE_AUTHOR("Josef Gajdusek <atx@atx.name>");
  99MODULE_DESCRIPTION("HMC5983 SPI driver");
 100MODULE_LICENSE("GPL");
 101