drivers/iio/light/st_uvis25_spi.c

   1 /*
   2  * STMicroelectronics uvis25 spi driver
   3  *
   4  * Copyright 2017 STMicroelectronics Inc.
   5  *
   6  * Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
   7  *
   8  * Licensed under the GPL-2.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/spi/spi.h>
  14 #include <linux/slab.h>
  15 #include <linux/regmap.h>
  16
  17 #include "st_uvis25.h"
  18
  19 #define UVIS25_SENSORS_SPI_READ         BIT(7)
  20 #define UVIS25_SPI_AUTO_INCREMENT       BIT(6)
  21
  22 static const struct regmap_config st_uvis25_spi_regmap_config = {
  23         .reg_bits = 8,
  24         .val_bits = 8,
  25         .read_flag_mask = UVIS25_SENSORS_SPI_READ | UVIS25_SPI_AUTO_INCREMENT,
  26         .write_flag_mask = UVIS25_SPI_AUTO_INCREMENT,
  27 };
  28
  29 static int st_uvis25_spi_probe(struct spi_device *spi)
  30 {
  31         struct regmap *regmap;
  32
  33         regmap = devm_regmap_init_spi(spi, &st_uvis25_spi_regmap_config);
  34         if (IS_ERR(regmap)) {
  35                 dev_err(&spi->dev, "Failed to register spi regmap %d\n",
  36                         (int)PTR_ERR(regmap));
  37                 return PTR_ERR(regmap);
  38         }
  39
  40         return st_uvis25_probe(&spi->dev, spi->irq, regmap);
  41 }
  42
  43 static const struct of_device_id st_uvis25_spi_of_match[] = {
  44         { .compatible = "st,uvis25", },
  45         {},
  46 };
  47 MODULE_DEVICE_TABLE(of, st_uvis25_spi_of_match);
  48
  49 static const struct spi_device_id st_uvis25_spi_id_table[] = {
  50         { ST_UVIS25_DEV_NAME },
  51         {},
  52 };
  53 MODULE_DEVICE_TABLE(spi, st_uvis25_spi_id_table);
  54
  55 static struct spi_driver st_uvis25_driver = {
  56         .driver = {
  57                 .name = "st_uvis25_spi",
  58                 .pm = &st_uvis25_pm_ops,
  59                 .of_match_table = of_match_ptr(st_uvis25_spi_of_match),
  60         },
  61         .probe = st_uvis25_spi_probe,
  62         .id_table = st_uvis25_spi_id_table,
  63 };
  64 module_spi_driver(st_uvis25_driver);
  65
  66 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
  67 MODULE_DESCRIPTION("STMicroelectronics uvis25 spi driver");
  68 MODULE_LICENSE("GPL v2");