xref: /openbmc/linux/drivers/iio/accel/adxl313_spi.c (revision a7a1c60b)
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