drivers/staging/comedi/drivers/dyna_pci10xx.c

   1 /*
   2  * comedi/drivers/dyna_pci10xx.c
   3  * Copyright (C) 2011 Prashant Shah, pshah.mumbai@gmail.com
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 /*
  21  Driver: dyna_pci10xx
  22  Devices: Dynalog India PCI DAQ Cards, http://www.dynalogindia.com/
  23  Author: Prashant Shah <pshah.mumbai@gmail.com>
  24  Developed at Automation Labs, Chemical Dept., IIT Bombay, India.
  25  Prof. Kannan Moudgalya <kannan@iitb.ac.in>
  26  http://www.iitb.ac.in
  27  Status: Stable
  28  Version: 1.0
  29  Device Supported :
  30  - Dynalog PCI 1050
  31
  32  Notes :
  33  - Dynalog India Pvt. Ltd. does not have a registered PCI Vendor ID and
  34  they are using the PLX Technlogies Vendor ID since that is the PCI Chip used
  35  in the card.
  36  - Dynalog India Pvt. Ltd. has provided the internal register specification for
  37  their cards in their manuals.
  38 */
  39
  40 #include "../comedidev.h"
  41 #include <linux/mutex.h>
  42
  43 #define READ_TIMEOUT 50
  44
  45 static const struct comedi_lrange range_pci1050_ai = { 3, {
  46                                                           BIP_RANGE(10),
  47                                                           BIP_RANGE(5),
  48                                                           UNI_RANGE(10)
  49                                                           }
  50 };
  51
  52 static const char range_codes_pci1050_ai[] = { 0x00, 0x10, 0x30 };
  53
  54 struct dyna_pci10xx_private {
  55         struct mutex mutex;
  56         unsigned long BADR3;
  57 };
  58
  59 /******************************************************************************/
  60 /************************** READ WRITE FUNCTIONS ******************************/
  61 /******************************************************************************/
  62
  63 /* analog input callback */
  64 static int dyna_pci10xx_insn_read_ai(struct comedi_device *dev,
  65                         struct comedi_subdevice *s,
  66                         struct comedi_insn *insn, unsigned int *data)
  67 {
  68         struct dyna_pci10xx_private *devpriv = dev->private;
  69         int n, counter;
  70         u16 d = 0;
  71         unsigned int chan, range;
  72
  73         /* get the channel number and range */
  74         chan = CR_CHAN(insn->chanspec);
  75         range = range_codes_pci1050_ai[CR_RANGE((insn->chanspec))];
  76
  77         mutex_lock(&devpriv->mutex);
  78         /* convert n samples */
  79         for (n = 0; n < insn->n; n++) {
  80                 /* trigger conversion */
  81                 smp_mb();
  82                 outw_p(0x0000 + range + chan, dev->iobase + 2);
  83                 udelay(10);
  84                 /* read data */
  85                 for (counter = 0; counter < READ_TIMEOUT; counter++) {
  86                         d = inw_p(dev->iobase);
  87
  88                         /* check if read is successful if the EOC bit is set */
  89                         if (d & (1 << 15))
  90                                 goto conv_finish;
  91                 }
  92                 data[n] = 0;
  93                 printk(KERN_DEBUG "comedi: dyna_pci10xx: "
  94                         "timeout reading analog input\n");
  95                 continue;
  96 conv_finish:
  97                 /* mask the first 4 bits - EOC bits */
  98                 d &= 0x0FFF;
  99                 data[n] = d;
 100         }
 101         mutex_unlock(&devpriv->mutex);
 102
 103         /* return the number of samples read/written */
 104         return n;
 105 }
 106
 107 /* analog output callback */
 108 static int dyna_pci10xx_insn_write_ao(struct comedi_device *dev,
 109                                  struct comedi_subdevice *s,
 110                                  struct comedi_insn *insn, unsigned int *data)
 111 {
 112         struct dyna_pci10xx_private *devpriv = dev->private;
 113         int n;
 114         unsigned int chan, range;
 115
 116         chan = CR_CHAN(insn->chanspec);
 117         range = range_codes_pci1050_ai[CR_RANGE((insn->chanspec))];
 118
 119         mutex_lock(&devpriv->mutex);
 120         for (n = 0; n < insn->n; n++) {
 121                 smp_mb();
 122                 /* trigger conversion and write data */
 123                 outw_p(data[n], dev->iobase);
 124                 udelay(10);
 125         }
 126         mutex_unlock(&devpriv->mutex);
 127         return n;
 128 }
 129
 130 /* digital input bit interface */
 131 static int dyna_pci10xx_di_insn_bits(struct comedi_device *dev,
 132                               struct comedi_subdevice *s,
 133                               struct comedi_insn *insn, unsigned int *data)
 134 {
 135         struct dyna_pci10xx_private *devpriv = dev->private;
 136         u16 d = 0;
 137
 138         mutex_lock(&devpriv->mutex);
 139         smp_mb();
 140         d = inw_p(devpriv->BADR3);
 141         udelay(10);
 142
 143         /* on return the data[0] contains output and data[1] contains input */
 144         data[1] = d;
 145         data[0] = s->state;
 146         mutex_unlock(&devpriv->mutex);
 147         return insn->n;
 148 }
 149
 150 /* digital output bit interface */
 151 static int dyna_pci10xx_do_insn_bits(struct comedi_device *dev,
 152                               struct comedi_subdevice *s,
 153                               struct comedi_insn *insn, unsigned int *data)
 154 {
 155         struct dyna_pci10xx_private *devpriv = dev->private;
 156
 157         /* The insn data is a mask in data[0] and the new data
 158          * in data[1], each channel cooresponding to a bit.
 159          * s->state contains the previous write data
 160          */
 161         mutex_lock(&devpriv->mutex);
 162         if (data[0]) {
 163                 s->state &= ~data[0];
 164                 s->state |= (data[0] & data[1]);
 165                 smp_mb();
 166                 outw_p(s->state, devpriv->BADR3);
 167                 udelay(10);
 168         }
 169
 170         /*
 171          * On return, data[1] contains the value of the digital
 172          * input and output lines. We just return the software copy of the
 173          * output values if it was a purely digital output subdevice.
 174          */
 175         data[1] = s->state;
 176         mutex_unlock(&devpriv->mutex);
 177         return insn->n;
 178 }
 179
 180 static int dyna_pci10xx_auto_attach(struct comedi_device *dev,
 181                                               unsigned long context_unused)
 182 {
 183         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 184         struct dyna_pci10xx_private *devpriv;
 185         struct comedi_subdevice *s;
 186         int ret;
 187
 188         dev->board_name = dev->driver->driver_name;
 189
 190         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 191         if (!devpriv)
 192                 return -ENOMEM;
 193         dev->private = devpriv;
 194
 195         ret = comedi_pci_enable(pcidev, dev->board_name);
 196         if (ret)
 197                 return ret;
 198         dev->iobase = pci_resource_start(pcidev, 2);
 199         devpriv->BADR3 = pci_resource_start(pcidev, 3);
 200
 201         mutex_init(&devpriv->mutex);
 202
 203         ret = comedi_alloc_subdevices(dev, 4);
 204         if (ret)
 205                 return ret;
 206
 207         /* analog input */
 208         s = &dev->subdevices[0];
 209         s->type = COMEDI_SUBD_AI;
 210         s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
 211         s->n_chan = 16;
 212         s->maxdata = 0x0FFF;
 213         s->range_table = &range_pci1050_ai;
 214         s->len_chanlist = 16;
 215         s->insn_read = dyna_pci10xx_insn_read_ai;
 216
 217         /* analog output */
 218         s = &dev->subdevices[1];
 219         s->type = COMEDI_SUBD_AO;
 220         s->subdev_flags = SDF_WRITABLE;
 221         s->n_chan = 16;
 222         s->maxdata = 0x0FFF;
 223         s->range_table = &range_unipolar10;
 224         s->len_chanlist = 16;
 225         s->insn_write = dyna_pci10xx_insn_write_ao;
 226
 227         /* digital input */
 228         s = &dev->subdevices[2];
 229         s->type = COMEDI_SUBD_DI;
 230         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 231         s->n_chan = 16;
 232         s->maxdata = 1;
 233         s->range_table = &range_digital;
 234         s->len_chanlist = 16;
 235         s->insn_bits = dyna_pci10xx_di_insn_bits;
 236
 237         /* digital output */
 238         s = &dev->subdevices[3];
 239         s->type = COMEDI_SUBD_DO;
 240         s->subdev_flags = SDF_WRITABLE | SDF_GROUND;
 241         s->n_chan = 16;
 242         s->maxdata = 1;
 243         s->range_table = &range_digital;
 244         s->len_chanlist = 16;
 245         s->state = 0;
 246         s->insn_bits = dyna_pci10xx_do_insn_bits;
 247
 248         dev_info(dev->class_dev, "%s attached\n", dev->board_name);
 249
 250         return 0;
 251 }
 252
 253 static void dyna_pci10xx_detach(struct comedi_device *dev)
 254 {
 255         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 256         struct dyna_pci10xx_private *devpriv = dev->private;
 257
 258         if (devpriv)
 259                 mutex_destroy(&devpriv->mutex);
 260         if (pcidev) {
 261                 if (dev->iobase)
 262                         comedi_pci_disable(pcidev);
 263         }
 264 }
 265
 266 static struct comedi_driver dyna_pci10xx_driver = {
 267         .driver_name    = "dyna_pci10xx",
 268         .module         = THIS_MODULE,
 269         .auto_attach    = dyna_pci10xx_auto_attach,
 270         .detach         = dyna_pci10xx_detach,
 271 };
 272
 273 static int dyna_pci10xx_pci_probe(struct pci_dev *dev,
 274                                             const struct pci_device_id *ent)
 275 {
 276         return comedi_pci_auto_config(dev, &dyna_pci10xx_driver);
 277 }
 278
 279 static void dyna_pci10xx_pci_remove(struct pci_dev *dev)
 280 {
 281         comedi_pci_auto_unconfig(dev);
 282 }
 283
 284 static DEFINE_PCI_DEVICE_TABLE(dyna_pci10xx_pci_table) = {
 285         { PCI_DEVICE(PCI_VENDOR_ID_PLX, 0x1050) },
 286         { 0 }
 287 };
 288 MODULE_DEVICE_TABLE(pci, dyna_pci10xx_pci_table);
 289
 290 static struct pci_driver dyna_pci10xx_pci_driver = {
 291         .name           = "dyna_pci10xx",
 292         .id_table       = dyna_pci10xx_pci_table,
 293         .probe          = dyna_pci10xx_pci_probe,
 294         .remove         = dyna_pci10xx_pci_remove,
 295 };
 296 module_comedi_pci_driver(dyna_pci10xx_driver, dyna_pci10xx_pci_driver);
 297
 298 MODULE_LICENSE("GPL");
 299 MODULE_AUTHOR("Prashant Shah <pshah.mumbai@gmail.com>");
 300 MODULE_DESCRIPTION("Comedi based drivers for Dynalog PCI DAQ cards");