drivers/iio/accel/adxl313_spi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ADXL313 3-Axis Digital Accelerometer
   4  *
   5  * Copyright (c) 2021 Lucas Stankus <[email protected]>
   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
  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
  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 <[email protected]>");
 126 MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
 127 MODULE_LICENSE("GPL v2");
 128 MODULE_IMPORT_NS(IIO_ADXL313);