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1// SPDX-License-Identifier: GPL-2.02/*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 13static 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 26static 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 47static const struct of_device_id rm3100_dt_match[] = {48 { .compatible = "pni,rm3100", },49 { }50};51MODULE_DEVICE_TABLE(of, rm3100_dt_match);52 53static struct spi_driver rm3100_driver = {54 .driver = {55 .name = "rm3100-spi",56 .of_match_table = rm3100_dt_match,57 },58 .probe = rm3100_probe,59};60module_spi_driver(rm3100_driver);61 62MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");63MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer spi driver");64MODULE_LICENSE("GPL v2");65MODULE_IMPORT_NS(IIO_RM3100);66