drivers/iio/adc/ad7606_spi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * AD7606 SPI ADC driver
   4  *
   5  * Copyright 2011 Analog Devices Inc.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/spi/spi.h>
  10 #include <linux/types.h>
  11 #include <linux/err.h>
  12
  13 #include <linux/iio/iio.h>
  14 #include "ad7606.h"
  15
  16 #define MAX_SPI_FREQ_HZ         23500000        /* VDRIVE above 4.75 V */
  17
  18 static int ad7606_spi_read_block(struct device *dev,
  19                                  int count, void *buf)
  20 {
  21         struct spi_device *spi = to_spi_device(dev);
  22         int i, ret;
  23         unsigned short *data = buf;
  24         __be16 *bdata = buf;
  25
  26         ret = spi_read(spi, buf, count * 2);
  27         if (ret < 0) {
  28                 dev_err(&spi->dev, "SPI read error\n");
  29                 return ret;
  30         }
  31
  32         for (i = 0; i < count; i++)
  33                 data[i] = be16_to_cpu(bdata[i]);
  34
  35         return 0;
  36 }
  37
  38 static const struct ad7606_bus_ops ad7606_spi_bops = {
  39         .read_block = ad7606_spi_read_block,
  40 };
  41
  42 static int ad7606_spi_probe(struct spi_device *spi)
  43 {
  44         const struct spi_device_id *id = spi_get_device_id(spi);
  45
  46         return ad7606_probe(&spi->dev, spi->irq, NULL,
  47                             id->name, id->driver_data,
  48                             &ad7606_spi_bops);
  49 }
  50
  51 static const struct spi_device_id ad7606_id_table[] = {
  52         { "ad7605-4", ID_AD7605_4 },
  53         { "ad7606-4", ID_AD7606_4 },
  54         { "ad7606-6", ID_AD7606_6 },
  55         { "ad7606-8", ID_AD7606_8 },
  56         { "ad7616",   ID_AD7616 },
  57         {}
  58 };
  59 MODULE_DEVICE_TABLE(spi, ad7606_id_table);
  60
  61 static const struct of_device_id ad7606_of_match[] = {
  62         { .compatible = "adi,ad7605-4" },
  63         { .compatible = "adi,ad7606-4" },
  64         { .compatible = "adi,ad7606-6" },
  65         { .compatible = "adi,ad7606-8" },
  66         { .compatible = "adi,ad7616" },
  67         { },
  68 };
  69 MODULE_DEVICE_TABLE(of, ad7606_of_match);
  70
  71 static struct spi_driver ad7606_driver = {
  72         .driver = {
  73                 .name = "ad7606",
  74                 .of_match_table = ad7606_of_match,
  75                 .pm = AD7606_PM_OPS,
  76         },
  77         .probe = ad7606_spi_probe,
  78         .id_table = ad7606_id_table,
  79 };
  80 module_spi_driver(ad7606_driver);
  81
  82 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
  83 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
  84 MODULE_LICENSE("GPL v2");