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
18static 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
48static 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
64static 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
96static 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
103MODULE_DEVICE_TABLE(spi, adxl313_spi_id);
104
105static 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
112MODULE_DEVICE_TABLE(of, adxl313_of_match);
113
114static 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
123module_spi_driver(adxl313_spi_driver);
124
125MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@gmail.com>");
126MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
127MODULE_LICENSE("GPL v2");
128MODULE_IMPORT_NS(IIO_ADXL313);
129