1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * SPI driver for hmc5983 4 * 5 * Copyright (C) Josef Gajdusek <atx@atx.name> 6 */ 7 8 #include <linux/module.h> 9 #include <linux/spi/spi.h> 10 #include <linux/iio/iio.h> 11 12 #include "hmc5843.h" 13 14 static const struct regmap_range hmc5843_readable_ranges[] = { 15 regmap_reg_range(0, HMC5843_ID_END), 16 }; 17 18 static const struct regmap_access_table hmc5843_readable_table = { 19 .yes_ranges = hmc5843_readable_ranges, 20 .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges), 21 }; 22 23 static const struct regmap_range hmc5843_writable_ranges[] = { 24 regmap_reg_range(0, HMC5843_MODE_REG), 25 }; 26 27 static const struct regmap_access_table hmc5843_writable_table = { 28 .yes_ranges = hmc5843_writable_ranges, 29 .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges), 30 }; 31 32 static const struct regmap_range hmc5843_volatile_ranges[] = { 33 regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG), 34 }; 35 36 static const struct regmap_access_table hmc5843_volatile_table = { 37 .yes_ranges = hmc5843_volatile_ranges, 38 .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges), 39 }; 40 41 static const struct regmap_config hmc5843_spi_regmap_config = { 42 .reg_bits = 8, 43 .val_bits = 8, 44 45 .rd_table = &hmc5843_readable_table, 46 .wr_table = &hmc5843_writable_table, 47 .volatile_table = &hmc5843_volatile_table, 48 49 /* Autoincrement address pointer */ 50 .read_flag_mask = 0xc0, 51 52 .cache_type = REGCACHE_RBTREE, 53 }; 54 55 static int hmc5843_spi_probe(struct spi_device *spi) 56 { 57 int ret; 58 struct regmap *regmap; 59 const struct spi_device_id *id = spi_get_device_id(spi); 60 61 spi->mode = SPI_MODE_3; 62 spi->max_speed_hz = 8000000; 63 spi->bits_per_word = 8; 64 ret = spi_setup(spi); 65 if (ret) 66 return ret; 67 68 regmap = devm_regmap_init_spi(spi, &hmc5843_spi_regmap_config); 69 if (IS_ERR(regmap)) 70 return PTR_ERR(regmap); 71 72 return hmc5843_common_probe(&spi->dev, 73 regmap, 74 id->driver_data, id->name); 75 } 76 77 static int hmc5843_spi_remove(struct spi_device *spi) 78 { 79 return hmc5843_common_remove(&spi->dev); 80 } 81 82 static const struct spi_device_id hmc5843_id[] = { 83 { "hmc5983", HMC5983_ID }, 84 { } 85 }; 86 MODULE_DEVICE_TABLE(spi, hmc5843_id); 87 88 static struct spi_driver hmc5843_driver = { 89 .driver = { 90 .name = "hmc5843", 91 .pm = HMC5843_PM_OPS, 92 }, 93 .id_table = hmc5843_id, 94 .probe = hmc5843_spi_probe, 95 .remove = hmc5843_spi_remove, 96 }; 97 98 module_spi_driver(hmc5843_driver); 99 100 MODULE_AUTHOR("Josef Gajdusek <atx@atx.name>"); 101 MODULE_DESCRIPTION("HMC5983 SPI driver"); 102 MODULE_LICENSE("GPL"); 103