1*121354b2SSong Qiang // SPDX-License-Identifier: GPL-2.0 2*121354b2SSong Qiang /* 3*121354b2SSong Qiang * Support for PNI RM3100 3-axis geomagnetic sensor on a spi bus. 4*121354b2SSong Qiang * 5*121354b2SSong Qiang * Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com> 6*121354b2SSong Qiang */ 7*121354b2SSong Qiang 8*121354b2SSong Qiang #include <linux/module.h> 9*121354b2SSong Qiang #include <linux/spi/spi.h> 10*121354b2SSong Qiang 11*121354b2SSong Qiang #include "rm3100.h" 12*121354b2SSong Qiang 13*121354b2SSong Qiang static const struct regmap_config rm3100_regmap_config = { 14*121354b2SSong Qiang .reg_bits = 8, 15*121354b2SSong Qiang .val_bits = 8, 16*121354b2SSong Qiang 17*121354b2SSong Qiang .rd_table = &rm3100_readable_table, 18*121354b2SSong Qiang .wr_table = &rm3100_writable_table, 19*121354b2SSong Qiang .volatile_table = &rm3100_volatile_table, 20*121354b2SSong Qiang 21*121354b2SSong Qiang .read_flag_mask = 0x80, 22*121354b2SSong Qiang 23*121354b2SSong Qiang .cache_type = REGCACHE_RBTREE, 24*121354b2SSong Qiang }; 25*121354b2SSong Qiang 26*121354b2SSong Qiang static int rm3100_probe(struct spi_device *spi) 27*121354b2SSong Qiang { 28*121354b2SSong Qiang struct regmap *regmap; 29*121354b2SSong Qiang int ret; 30*121354b2SSong Qiang 31*121354b2SSong Qiang /* Actually this device supports both mode 0 and mode 3. */ 32*121354b2SSong Qiang spi->mode = SPI_MODE_0; 33*121354b2SSong Qiang /* Data rates cannot exceed 1Mbits. */ 34*121354b2SSong Qiang spi->max_speed_hz = 1000000; 35*121354b2SSong Qiang spi->bits_per_word = 8; 36*121354b2SSong Qiang ret = spi_setup(spi); 37*121354b2SSong Qiang if (ret) 38*121354b2SSong Qiang return ret; 39*121354b2SSong Qiang 40*121354b2SSong Qiang regmap = devm_regmap_init_spi(spi, &rm3100_regmap_config); 41*121354b2SSong Qiang if (IS_ERR(regmap)) 42*121354b2SSong Qiang return PTR_ERR(regmap); 43*121354b2SSong Qiang 44*121354b2SSong Qiang return rm3100_common_probe(&spi->dev, regmap, spi->irq); 45*121354b2SSong Qiang } 46*121354b2SSong Qiang 47*121354b2SSong Qiang static const struct of_device_id rm3100_dt_match[] = { 48*121354b2SSong Qiang { .compatible = "pni,rm3100", }, 49*121354b2SSong Qiang { } 50*121354b2SSong Qiang }; 51*121354b2SSong Qiang MODULE_DEVICE_TABLE(of, rm3100_dt_match); 52*121354b2SSong Qiang 53*121354b2SSong Qiang static struct spi_driver rm3100_driver = { 54*121354b2SSong Qiang .driver = { 55*121354b2SSong Qiang .name = "rm3100-spi", 56*121354b2SSong Qiang .of_match_table = rm3100_dt_match, 57*121354b2SSong Qiang }, 58*121354b2SSong Qiang .probe = rm3100_probe, 59*121354b2SSong Qiang }; 60*121354b2SSong Qiang module_spi_driver(rm3100_driver); 61*121354b2SSong Qiang 62*121354b2SSong Qiang MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>"); 63*121354b2SSong Qiang MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer spi driver"); 64*121354b2SSong Qiang MODULE_LICENSE("GPL v2"); 65