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 | |
23 | static int adxl345_spi_probe(struct spi_device *spi) |
24 | { |
25 | struct regmap *regmap; |
26 | |
27 | /* Bail out if max_speed_hz exceeds 5 MHz */ |
28 | if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) |
29 | return dev_err_probe(dev: &spi->dev, err: -EINVAL, fmt: "SPI CLK, %d Hz exceeds 5 MHz\n" , |
30 | spi->max_speed_hz); |
31 | |
32 | regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config); |
33 | if (IS_ERR(ptr: regmap)) |
34 | return dev_err_probe(dev: &spi->dev, err: PTR_ERR(ptr: regmap), fmt: "Error initializing regmap\n" ); |
35 | |
36 | return adxl345_core_probe(dev: &spi->dev, regmap); |
37 | } |
38 | |
39 | static const struct adxl345_chip_info adxl345_spi_info = { |
40 | .name = "adxl345" , |
41 | .uscale = ADXL345_USCALE, |
42 | }; |
43 | |
44 | static const struct adxl345_chip_info adxl375_spi_info = { |
45 | .name = "adxl375" , |
46 | .uscale = ADXL375_USCALE, |
47 | }; |
48 | |
49 | static const struct spi_device_id adxl345_spi_id[] = { |
50 | { "adxl345" , (kernel_ulong_t)&adxl345_spi_info }, |
51 | { "adxl375" , (kernel_ulong_t)&adxl375_spi_info }, |
52 | { } |
53 | }; |
54 | MODULE_DEVICE_TABLE(spi, adxl345_spi_id); |
55 | |
56 | static const struct of_device_id adxl345_of_match[] = { |
57 | { .compatible = "adi,adxl345" , .data = &adxl345_spi_info }, |
58 | { .compatible = "adi,adxl375" , .data = &adxl375_spi_info }, |
59 | { } |
60 | }; |
61 | MODULE_DEVICE_TABLE(of, adxl345_of_match); |
62 | |
63 | static const struct acpi_device_id adxl345_acpi_match[] = { |
64 | { "ADS0345" , (kernel_ulong_t)&adxl345_spi_info }, |
65 | { } |
66 | }; |
67 | MODULE_DEVICE_TABLE(acpi, adxl345_acpi_match); |
68 | |
69 | static struct spi_driver adxl345_spi_driver = { |
70 | .driver = { |
71 | .name = "adxl345_spi" , |
72 | .of_match_table = adxl345_of_match, |
73 | .acpi_match_table = adxl345_acpi_match, |
74 | }, |
75 | .probe = adxl345_spi_probe, |
76 | .id_table = adxl345_spi_id, |
77 | }; |
78 | module_spi_driver(adxl345_spi_driver); |
79 | |
80 | MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>" ); |
81 | MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver" ); |
82 | MODULE_LICENSE("GPL v2" ); |
83 | MODULE_IMPORT_NS(IIO_ADXL345); |
84 | |