drivers/staging/iio/dds/ad9951.c

   1 /*
   2  * Driver for ADI Direct Digital Synthesis ad9951
   3  *
   4  * Copyright (c) 2010 Analog Devices Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11 #include <linux/types.h>
  12 #include <linux/mutex.h>
  13 #include <linux/device.h>
  14 #include <linux/spi/spi.h>
  15 #include <linux/slab.h>
  16 #include <linux/sysfs.h>
  17
  18 #include "../iio.h"
  19 #include "../sysfs.h"
  20
  21 #define DRV_NAME "ad9951"
  22
  23 #define CFR1 0x0
  24 #define CFR2 0x1
  25
  26 #define AUTO_OSK        (1)
  27 #define OSKEN           (1 << 1)
  28 #define LOAD_ARR        (1 << 2)
  29
  30 #define AUTO_SYNC       (1 << 7)
  31
  32 #define LSB_FST         (1)
  33 #define SDIO_IPT        (1 << 1)
  34 #define CLR_PHA         (1 << 2)
  35 #define SINE_OPT        (1 << 4)
  36 #define ACLR_PHA        (1 << 5)
  37
  38 #define VCO_RANGE       (1 << 2)
  39
  40 #define CRS_OPT         (1 << 1)
  41 #define HMANU_SYNC      (1 << 2)
  42 #define HSPD_SYNC       (1 << 3)
  43
  44 /* Register format: 1 byte addr + value */
  45 struct ad9951_config {
  46         u8 asf[3];
  47         u8 arr[2];
  48         u8 ftw0[5];
  49         u8 ftw1[3];
  50 };
  51
  52 struct ad9951_state {
  53         struct mutex lock;
  54         struct spi_device *sdev;
  55 };
  56
  57 static ssize_t ad9951_set_parameter(struct device *dev,
  58                                         struct device_attribute *attr,
  59                                         const char *buf,
  60                                         size_t len)
  61 {
  62         struct spi_message msg;
  63         struct spi_transfer xfer;
  64         int ret;
  65         struct ad9951_config *config = (struct ad9951_config *)buf;
  66         struct iio_dev *idev = dev_get_drvdata(dev);
  67         struct ad9951_state *st = iio_priv(idev);
  68
  69         xfer.len = 3;
  70         xfer.tx_buf = &config->asf[0];
  71         mutex_lock(&st->lock);
  72
  73         spi_message_init(&msg);
  74         spi_message_add_tail(&xfer, &msg);
  75         ret = spi_sync(st->sdev, &msg);
  76         if (ret)
  77                 goto error_ret;
  78
  79         xfer.len = 2;
  80         xfer.tx_buf = &config->arr[0];
  81
  82         spi_message_init(&msg);
  83         spi_message_add_tail(&xfer, &msg);
  84         ret = spi_sync(st->sdev, &msg);
  85         if (ret)
  86                 goto error_ret;
  87
  88         xfer.len = 5;
  89         xfer.tx_buf = &config->ftw0[0];
  90
  91         spi_message_init(&msg);
  92         spi_message_add_tail(&xfer, &msg);
  93         ret = spi_sync(st->sdev, &msg);
  94         if (ret)
  95                 goto error_ret;
  96
  97         xfer.len = 3;
  98         xfer.tx_buf = &config->ftw1[0];
  99
 100         spi_message_init(&msg);
 101         spi_message_add_tail(&xfer, &msg);
 102         ret = spi_sync(st->sdev, &msg);
 103         if (ret)
 104                 goto error_ret;
 105 error_ret:
 106         mutex_unlock(&st->lock);
 107
 108         return ret ? ret : len;
 109 }
 110
 111 static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9951_set_parameter, 0);
 112
 113 static void ad9951_init(struct ad9951_state *st)
 114 {
 115         struct spi_message msg;
 116         struct spi_transfer xfer;
 117         int ret;
 118         u8 cfr[5];
 119
 120         cfr[0] = CFR1;
 121         cfr[1] = 0;
 122         cfr[2] = LSB_FST | CLR_PHA | SINE_OPT | ACLR_PHA;
 123         cfr[3] = AUTO_OSK | OSKEN | LOAD_ARR;
 124         cfr[4] = 0;
 125
 126         mutex_lock(&st->lock);
 127
 128         xfer.len = 5;
 129         xfer.tx_buf = &cfr;
 130
 131         spi_message_init(&msg);
 132         spi_message_add_tail(&xfer, &msg);
 133         ret = spi_sync(st->sdev, &msg);
 134         if (ret)
 135                 goto error_ret;
 136
 137         cfr[0] = CFR2;
 138         cfr[1] = VCO_RANGE;
 139         cfr[2] = HSPD_SYNC;
 140         cfr[3] = 0;
 141
 142         xfer.len = 4;
 143         xfer.tx_buf = &cfr;
 144
 145         spi_message_init(&msg);
 146         spi_message_add_tail(&xfer, &msg);
 147         ret = spi_sync(st->sdev, &msg);
 148         if (ret)
 149                 goto error_ret;
 150
 151 error_ret:
 152         mutex_unlock(&st->lock);
 153
 154
 155
 156 }
 157
 158 static struct attribute *ad9951_attributes[] = {
 159         &iio_dev_attr_dds.dev_attr.attr,
 160         NULL,
 161 };
 162
 163 static const struct attribute_group ad9951_attribute_group = {
 164         .name = DRV_NAME,
 165         .attrs = ad9951_attributes,
 166 };
 167
 168 static const struct iio_info ad9951_info = {
 169         .attrs = &ad9951_attribute_group,
 170         .driver_module = THIS_MODULE,
 171 };
 172
 173 static int __devinit ad9951_probe(struct spi_device *spi)
 174 {
 175         struct ad9951_state *st;
 176         struct iio_dev *idev;
 177         int ret = 0;
 178
 179         idev = iio_allocate_device(sizeof(*st));
 180         if (idev == NULL) {
 181                 ret = -ENOMEM;
 182                 goto error_ret;
 183         }
 184         spi_set_drvdata(spi, idev);
 185         st = iio_priv(idev);
 186         mutex_init(&st->lock);
 187         st->sdev = spi;
 188
 189         idev->dev.parent = &spi->dev;
 190
 191         idev->info = &ad9951_info;
 192         idev->modes = INDIO_DIRECT_MODE;
 193
 194         ret = iio_device_register(idev);
 195         if (ret)
 196                 goto error_free_dev;
 197         spi->max_speed_hz = 2000000;
 198         spi->mode = SPI_MODE_3;
 199         spi->bits_per_word = 8;
 200         spi_setup(spi);
 201         ad9951_init(st);
 202         return 0;
 203
 204 error_free_dev:
 205         iio_free_device(idev);
 206
 207 error_ret:
 208         return ret;
 209 }
 210
 211 static int __devexit ad9951_remove(struct spi_device *spi)
 212 {
 213         iio_device_unregister(spi_get_drvdata(spi));
 214
 215         return 0;
 216 }
 217
 218 static struct spi_driver ad9951_driver = {
 219         .driver = {
 220                 .name = DRV_NAME,
 221                 .owner = THIS_MODULE,
 222         },
 223         .probe = ad9951_probe,
 224         .remove = __devexit_p(ad9951_remove),
 225 };
 226
 227 static __init int ad9951_spi_init(void)
 228 {
 229         return spi_register_driver(&ad9951_driver);
 230 }
 231 module_init(ad9951_spi_init);
 232
 233 static __exit void ad9951_spi_exit(void)
 234 {
 235         spi_unregister_driver(&ad9951_driver);
 236 }
 237 module_exit(ad9951_spi_exit);
 238
 239 MODULE_AUTHOR("Cliff Cai");
 240 MODULE_DESCRIPTION("Analog Devices ad9951 driver");
 241 MODULE_LICENSE("GPL v2");