drivers/staging/iio/adc/ad7606_spi.c

   1 /*
   2  * AD7606 SPI ADC driver
   3  *
   4  * Copyright 2011 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/spi/spi.h>
  11 #include <linux/types.h>
  12 #include <linux/err.h>
  13
  14 #include "../iio.h"
  15 #include "ad7606.h"
  16
  17 #define MAX_SPI_FREQ_HZ         23500000        /* VDRIVE above 4.75 V */
  18
  19 static int ad7606_spi_read_block(struct device *dev,
  20                                  int count, void *buf)
  21 {
  22         struct spi_device *spi = to_spi_device(dev);
  23         int i, ret;
  24         unsigned short *data = buf;
  25
  26         ret = spi_read(spi, (u8 *)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(data[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 __devinit ad7606_spi_probe(struct spi_device *spi)
  43 {
  44         struct iio_dev *indio_dev;
  45
  46         indio_dev = ad7606_probe(&spi->dev, spi->irq, NULL,
  47                            spi_get_device_id(spi)->driver_data,
  48                            &ad7606_spi_bops);
  49
  50         if (IS_ERR(indio_dev))
  51                 return PTR_ERR(indio_dev);
  52
  53         spi_set_drvdata(spi, indio_dev);
  54
  55         return 0;
  56 }
  57
  58 static int __devexit ad7606_spi_remove(struct spi_device *spi)
  59 {
  60         struct iio_dev *indio_dev = dev_get_drvdata(&spi->dev);
  61
  62         return ad7606_remove(indio_dev);
  63 }
  64
  65 #ifdef CONFIG_PM
  66 static int ad7606_spi_suspend(struct device *dev)
  67 {
  68         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  69
  70         ad7606_suspend(indio_dev);
  71
  72         return 0;
  73 }
  74
  75 static int ad7606_spi_resume(struct device *dev)
  76 {
  77         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  78
  79         ad7606_resume(indio_dev);
  80
  81         return 0;
  82 }
  83
  84 static const struct dev_pm_ops ad7606_pm_ops = {
  85         .suspend = ad7606_spi_suspend,
  86         .resume  = ad7606_spi_resume,
  87 };
  88 #define AD7606_SPI_PM_OPS (&ad7606_pm_ops)
  89
  90 #else
  91 #define AD7606_SPI_PM_OPS NULL
  92 #endif
  93
  94 static const struct spi_device_id ad7606_id[] = {
  95         {"ad7606-8", ID_AD7606_8},
  96         {"ad7606-6", ID_AD7606_6},
  97         {"ad7606-4", ID_AD7606_4},
  98         {}
  99 };
 100
 101 static struct spi_driver ad7606_driver = {
 102         .driver = {
 103                 .name = "ad7606",
 104                 .bus = &spi_bus_type,
 105                 .owner = THIS_MODULE,
 106                 .pm    = AD7606_SPI_PM_OPS,
 107         },
 108         .probe = ad7606_spi_probe,
 109         .remove = __devexit_p(ad7606_spi_remove),
 110         .id_table = ad7606_id,
 111 };
 112
 113 static int __init ad7606_spi_init(void)
 114 {
 115         return spi_register_driver(&ad7606_driver);
 116 }
 117 module_init(ad7606_spi_init);
 118
 119 static void __exit ad7606_spi_exit(void)
 120 {
 121         spi_unregister_driver(&ad7606_driver);
 122 }
 123 module_exit(ad7606_spi_exit);
 124
 125 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 126 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 127 MODULE_LICENSE("GPL v2");
 128 MODULE_ALIAS("spi:ad7606_spi");