1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ADXL345 3-Axis Digital Accelerometer SPI driver
4 *
5 * Copyright (c) 2017 Eva Rachel Retuya <eraretuya@gmail.com>
6 */
7
8 #include <linux/module.h>
9 #include <linux/regmap.h>
10 #include <linux/spi/spi.h>
11
12 #include "adxl345.h"
13
14 #define ADXL345_MAX_SPI_FREQ_HZ 5000000
15
16 static const struct regmap_config adxl345_spi_regmap_config = {
17 .reg_bits = 8,
18 .val_bits = 8,
19 /* Setting bits 7 and 6 enables multiple-byte read */
20 .read_flag_mask = BIT(7) | BIT(6),
21 };
22
adxl345_spi_setup(struct device * dev,struct regmap * regmap)23 static int adxl345_spi_setup(struct device *dev, struct regmap *regmap)
24 {
25 return regmap_write(regmap, ADXL345_REG_DATA_FORMAT, ADXL345_DATA_FORMAT_SPI_3WIRE);
26 }
27
adxl345_spi_probe(struct spi_device * spi)28 static int adxl345_spi_probe(struct spi_device *spi)
29 {
30 struct regmap *regmap;
31
32 /* Bail out if max_speed_hz exceeds 5 MHz */
33 if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ)
34 return dev_err_probe(&spi->dev, -EINVAL, "SPI CLK, %d Hz exceeds 5 MHz\n",
35 spi->max_speed_hz);
36
37 regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config);
38 if (IS_ERR(regmap))
39 return dev_err_probe(&spi->dev, PTR_ERR(regmap), "Error initializing regmap\n");
40
41 if (spi->mode & SPI_3WIRE)
42 return adxl345_core_probe(&spi->dev, regmap, adxl345_spi_setup);
43 else
44 return adxl345_core_probe(&spi->dev, regmap, NULL);
45 }
46
47 static const struct adxl345_chip_info adxl345_spi_info = {
48 .name = "adxl345",
49 .uscale = ADXL345_USCALE,
50 };
51
52 static const struct adxl345_chip_info adxl375_spi_info = {
53 .name = "adxl375",
54 .uscale = ADXL375_USCALE,
55 };
56
57 static const struct spi_device_id adxl345_spi_id[] = {
58 { "adxl345", (kernel_ulong_t)&adxl345_spi_info },
59 { "adxl375", (kernel_ulong_t)&adxl375_spi_info },
60 { }
61 };
62 MODULE_DEVICE_TABLE(spi, adxl345_spi_id);
63
64 static const struct of_device_id adxl345_of_match[] = {
65 { .compatible = "adi,adxl345", .data = &adxl345_spi_info },
66 { .compatible = "adi,adxl375", .data = &adxl375_spi_info },
67 { }
68 };
69 MODULE_DEVICE_TABLE(of, adxl345_of_match);
70
71 static const struct acpi_device_id adxl345_acpi_match[] = {
72 { "ADS0345", (kernel_ulong_t)&adxl345_spi_info },
73 { }
74 };
75 MODULE_DEVICE_TABLE(acpi, adxl345_acpi_match);
76
77 static struct spi_driver adxl345_spi_driver = {
78 .driver = {
79 .name = "adxl345_spi",
80 .of_match_table = adxl345_of_match,
81 .acpi_match_table = adxl345_acpi_match,
82 },
83 .probe = adxl345_spi_probe,
84 .id_table = adxl345_spi_id,
85 };
86 module_spi_driver(adxl345_spi_driver);
87
88 MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>");
89 MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver");
90 MODULE_LICENSE("GPL v2");
91 MODULE_IMPORT_NS("IIO_ADXL345");
92