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 #include <linux/property.h>
15
16 #include "adxl313.h"
17
18 static const struct regmap_config adxl31x_spi_regmap_config[] = {
19 [ADXL312] = {
20 .reg_bits = 8,
21 .val_bits = 8,
22 .rd_table = &adxl312_readable_regs_table,
23 .wr_table = &adxl312_writable_regs_table,
24 .max_register = 0x39,
25 /* Setting bits 7 and 6 enables multiple-byte read */
26 .read_flag_mask = BIT(7) | BIT(6),
27 },
28 [ADXL313] = {
29 .reg_bits = 8,
30 .val_bits = 8,
31 .rd_table = &adxl313_readable_regs_table,
32 .wr_table = &adxl313_writable_regs_table,
33 .max_register = 0x39,
34 /* Setting bits 7 and 6 enables multiple-byte read */
35 .read_flag_mask = BIT(7) | BIT(6),
36 },
37 [ADXL314] = {
38 .reg_bits = 8,
39 .val_bits = 8,
40 .rd_table = &adxl314_readable_regs_table,
41 .wr_table = &adxl314_writable_regs_table,
42 .max_register = 0x39,
43 /* Setting bits 7 and 6 enables multiple-byte read */
44 .read_flag_mask = BIT(7) | BIT(6),
45 },
46 };
47
adxl313_spi_setup(struct device * dev,struct regmap * regmap)48 static int adxl313_spi_setup(struct device *dev, struct regmap *regmap)
49 {
50 struct spi_device *spi = container_of(dev, struct spi_device, dev);
51 int ret;
52
53 if (spi->mode & SPI_3WIRE) {
54 ret = regmap_write(regmap, ADXL313_REG_DATA_FORMAT,
55 ADXL313_SPI_3WIRE);
56 if (ret)
57 return ret;
58 }
59
60 return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL,
61 ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE);
62 }
63
adxl313_spi_probe(struct spi_device * spi)64 static int adxl313_spi_probe(struct spi_device *spi)
65 {
66 const struct adxl313_chip_info *chip_data;
67 struct regmap *regmap;
68 int ret;
69
70 spi->mode |= SPI_MODE_3;
71 ret = spi_setup(spi);
72 if (ret)
73 return ret;
74
75 /*
76 * Retrieves device specific data as a pointer to a
77 * adxl313_chip_info structure
78 */
79 chip_data = device_get_match_data(&spi->dev);
80 if (!chip_data)
81 chip_data = (const struct adxl313_chip_info *)spi_get_device_id(spi)->driver_data;
82
83 regmap = devm_regmap_init_spi(spi,
84 &adxl31x_spi_regmap_config[chip_data->type]);
85
86 if (IS_ERR(regmap)) {
87 dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
88 PTR_ERR(regmap));
89 return PTR_ERR(regmap);
90 }
91
92 return adxl313_core_probe(&spi->dev, regmap,
93 chip_data, &adxl313_spi_setup);
94 }
95
96 static const struct spi_device_id adxl313_spi_id[] = {
97 { .name = "adxl312", .driver_data = (kernel_ulong_t)&adxl31x_chip_info[ADXL312] },
98 { .name = "adxl313", .driver_data = (kernel_ulong_t)&adxl31x_chip_info[ADXL313] },
99 { .name = "adxl314", .driver_data = (kernel_ulong_t)&adxl31x_chip_info[ADXL314] },
100 { }
101 };
102
103 MODULE_DEVICE_TABLE(spi, adxl313_spi_id);
104
105 static const struct of_device_id adxl313_of_match[] = {
106 { .compatible = "adi,adxl312", .data = &adxl31x_chip_info[ADXL312] },
107 { .compatible = "adi,adxl313", .data = &adxl31x_chip_info[ADXL313] },
108 { .compatible = "adi,adxl314", .data = &adxl31x_chip_info[ADXL314] },
109 { }
110 };
111
112 MODULE_DEVICE_TABLE(of, adxl313_of_match);
113
114 static struct spi_driver adxl313_spi_driver = {
115 .driver = {
116 .name = "adxl313_spi",
117 .of_match_table = adxl313_of_match,
118 },
119 .probe = adxl313_spi_probe,
120 .id_table = adxl313_spi_id,
121 };
122
123 module_spi_driver(adxl313_spi_driver);
124
125 MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@gmail.com>");
126 MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
127 MODULE_LICENSE("GPL v2");
128 MODULE_IMPORT_NS(IIO_ADXL313);
129