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"); 65