drivers/iio/magnetometer/rm3100-spi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Support for PNI RM3100 3-axis geomagnetic sensor on a spi bus.
   4  *
   5  * Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/spi/spi.h>
  10
  11 #include "rm3100.h"
  12
  13 static const struct regmap_config rm3100_regmap_config = {
  14         .reg_bits = 8,
  15         .val_bits = 8,
  16
  17         .rd_table = &rm3100_readable_table,
  18         .wr_table = &rm3100_writable_table,
  19         .volatile_table = &rm3100_volatile_table,
  20
  21         .read_flag_mask = 0x80,
  22
  23         .cache_type = REGCACHE_RBTREE,
  24 };
  25
  26 static int rm3100_probe(struct spi_device *spi)
  27 {
  28         struct regmap *regmap;
  29         int ret;
  30
  31         /* Actually this device supports both mode 0 and mode 3. */
  32         spi->mode = SPI_MODE_0;
  33         /* Data rates cannot exceed 1Mbits. */
  34         spi->max_speed_hz = 1000000;
  35         spi->bits_per_word = 8;
  36         ret = spi_setup(spi);
  37         if (ret)
  38                 return ret;
  39
  40         regmap = devm_regmap_init_spi(spi, &rm3100_regmap_config);
  41         if (IS_ERR(regmap))
  42                 return PTR_ERR(regmap);
  43
  44         return rm3100_common_probe(&spi->dev, regmap, spi->irq);
  45 }
  46
  47 static const struct of_device_id rm3100_dt_match[] = {
  48         { .compatible = "pni,rm3100", },
  49         { }
  50 };
  51 MODULE_DEVICE_TABLE(of, rm3100_dt_match);
  52
  53 static struct spi_driver rm3100_driver = {
  54         .driver = {
  55                 .name = "rm3100-spi",
  56                 .of_match_table = rm3100_dt_match,
  57         },
  58         .probe = rm3100_probe,
  59 };
  60 module_spi_driver(rm3100_driver);
  61
  62 MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");
  63 MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer spi driver");
  64 MODULE_LICENSE("GPL v2");