1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ADXL313 3-Axis Digital Accelerometer
4 *
5 * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com>
6 *
7 * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
8 */
9
10 #include <linux/mod_devicetable.h>
11 #include <linux/module.h>
12 #include <linux/regmap.h>
13 #include <linux/spi/spi.h>
14
15 #include "adxl313.h"
16
17 static const struct regmap_config adxl313_spi_regmap_config = {
18 .reg_bits = 8,
19 .val_bits = 8,
20 .rd_table = &adxl313_readable_regs_table,
21 .wr_table = &adxl313_writable_regs_table,
22 .max_register = 0x39,
23 /* Setting bits 7 and 6 enables multiple-byte read */
24 .read_flag_mask = BIT(7) | BIT(6),
25 };
26
adxl313_spi_setup(struct device * dev,struct regmap * regmap)27 static int adxl313_spi_setup(struct device *dev, struct regmap *regmap)
28 {
29 struct spi_device *spi = container_of(dev, struct spi_device, dev);
30 int ret;
31
32 if (spi->mode & SPI_3WIRE) {
33 ret = regmap_write(regmap, ADXL313_REG_DATA_FORMAT,
34 ADXL313_SPI_3WIRE);
35 if (ret)
36 return ret;
37 }
38
39 return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL,
40 ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE);
41 }
42
adxl313_spi_probe(struct spi_device * spi)43 static int adxl313_spi_probe(struct spi_device *spi)
44 {
45 const struct spi_device_id *id = spi_get_device_id(spi);
46 struct regmap *regmap;
47 int ret;
48
49 spi->mode |= SPI_MODE_3;
50 ret = spi_setup(spi);
51 if (ret)
52 return ret;
53
54 regmap = devm_regmap_init_spi(spi, &adxl313_spi_regmap_config);
55 if (IS_ERR(regmap)) {
56 dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
57 PTR_ERR(regmap));
58 return PTR_ERR(regmap);
59 }
60
61 return adxl313_core_probe(&spi->dev, regmap, id->name,
62 &adxl313_spi_setup);
63 }
64
65 static const struct spi_device_id adxl313_spi_id[] = {
66 { "adxl313" },
67 { }
68 };
69
70 MODULE_DEVICE_TABLE(spi, adxl313_spi_id);
71
72 static const struct of_device_id adxl313_of_match[] = {
73 { .compatible = "adi,adxl313" },
74 { }
75 };
76
77 MODULE_DEVICE_TABLE(of, adxl313_of_match);
78
79 static struct spi_driver adxl313_spi_driver = {
80 .driver = {
81 .name = "adxl313_spi",
82 .of_match_table = adxl313_of_match,
83 },
84 .probe = adxl313_spi_probe,
85 .id_table = adxl313_spi_id,
86 };
87
88 module_spi_driver(adxl313_spi_driver);
89
90 MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@gmail.com>");
91 MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
92 MODULE_LICENSE("GPL v2");
93