drivers/staging/comedi/drivers/adv_pci1720.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * COMEDI driver for Advantech PCI-1720U
   4  * Copyright (c) 2015 H Hartley Sweeten <hsweeten@visionengravers.com>
   5  *
   6  * Separated from the adv_pci1710 driver written by:
   7  * Michal Dobes <dobes@tesnet.cz>
   8  *
   9  * COMEDI - Linux Control and Measurement Device Interface
  10  * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
  11  */
  12
  13 /*
  14  * Driver: adv_pci1720
  15  * Description: 4-channel Isolated D/A Output board
  16  * Devices: [Advantech] PCI-7120U (adv_pci1720)
  17  * Author: H Hartley Sweeten <hsweeten@visionengravers.com>
  18  * Updated: Fri, 29 Oct 2015 17:19:35 -0700
  19  * Status: untested
  20  *
  21  * Configuration options: not applicable, uses PCI auto config
  22  *
  23  * The PCI-1720 has 4 isolated 12-bit analog output channels with multiple
  24  * output ranges. It also has a BoardID switch to allow differentiating
  25  * multiple boards in the system.
  26  *
  27  * The analog outputs can operate in two modes, immediate and synchronized.
  28  * This driver currently does not support the synchronized output mode.
  29  *
  30  * Jumpers JP1 to JP4 are used to set the current sink ranges for each
  31  * analog output channel. In order to use the current sink ranges, the
  32  * unipolar 5V range must be used. The voltage output and sink output for
  33  * each channel is available on the connector as separate pins.
  34  *
  35  * Jumper JP5 controls the "hot" reset state of the analog outputs.
  36  * Depending on its setting, the analog outputs will either keep the
  37  * last settings and output values or reset to the default state after
  38  * a "hot" reset. The default state for all channels is uniploar 5V range
  39  * and all the output values are 0V. To allow this feature to work, the
  40  * analog outputs are not "reset" when the driver attaches.
  41  */
  42
  43 #include <linux/module.h>
  44 #include <linux/delay.h>
  45
  46 #include "../comedi_pci.h"
  47
  48 /*
  49  * PCI BAR2 Register map (dev->iobase)
  50  */
  51 #define PCI1720_AO_LSB_REG(x)           (0x00 + ((x) * 2))
  52 #define PCI1720_AO_MSB_REG(x)           (0x01 + ((x) * 2))
  53 #define PCI1720_AO_RANGE_REG            0x08
  54 #define PCI1720_AO_RANGE(c, r)          (((r) & 0x3) << ((c) * 2))
  55 #define PCI1720_AO_RANGE_MASK(c)        PCI1720_AO_RANGE((c), 0x3)
  56 #define PCI1720_SYNC_REG                0x09
  57 #define PCI1720_SYNC_CTRL_REG           0x0f
  58 #define PCI1720_SYNC_CTRL_SC0           BIT(0)
  59 #define PCI1720_BOARDID_REG             0x14
  60
  61 static const struct comedi_lrange pci1720_ao_range = {
  62         4, {
  63                 UNI_RANGE(5),
  64                 UNI_RANGE(10),
  65                 BIP_RANGE(5),
  66                 BIP_RANGE(10)
  67         }
  68 };
  69
  70 static int pci1720_ao_insn_write(struct comedi_device *dev,
  71                                  struct comedi_subdevice *s,
  72                                  struct comedi_insn *insn,
  73                                  unsigned int *data)
  74 {
  75         unsigned int chan = CR_CHAN(insn->chanspec);
  76         unsigned int range = CR_RANGE(insn->chanspec);
  77         unsigned int val;
  78         int i;
  79
  80         /* set the channel range and polarity */
  81         val = inb(dev->iobase + PCI1720_AO_RANGE_REG);
  82         val &= ~PCI1720_AO_RANGE_MASK(chan);
  83         val |= PCI1720_AO_RANGE(chan, range);
  84         outb(val, dev->iobase + PCI1720_AO_RANGE_REG);
  85
  86         val = s->readback[chan];
  87         for (i = 0; i < insn->n; i++) {
  88                 val = data[i];
  89
  90                 outb(val & 0xff, dev->iobase + PCI1720_AO_LSB_REG(chan));
  91                 outb((val >> 8) & 0xff, dev->iobase + PCI1720_AO_MSB_REG(chan));
  92
  93                 /* conversion time is 2us (500 kHz throughput) */
  94                 usleep_range(2, 100);
  95         }
  96
  97         s->readback[chan] = val;
  98
  99         return insn->n;
 100 }
 101
 102 static int pci1720_di_insn_bits(struct comedi_device *dev,
 103                                 struct comedi_subdevice *s,
 104                                 struct comedi_insn *insn,
 105                                 unsigned int *data)
 106 {
 107         data[1] = inb(dev->iobase + PCI1720_BOARDID_REG);
 108
 109         return insn->n;
 110 }
 111
 112 static int pci1720_auto_attach(struct comedi_device *dev,
 113                                unsigned long context)
 114 {
 115         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 116         struct comedi_subdevice *s;
 117         int ret;
 118
 119         ret = comedi_pci_enable(dev);
 120         if (ret)
 121                 return ret;
 122         dev->iobase = pci_resource_start(pcidev, 2);
 123
 124         ret = comedi_alloc_subdevices(dev, 2);
 125         if (ret)
 126                 return ret;
 127
 128         /* Analog Output subdevice */
 129         s = &dev->subdevices[0];
 130         s->type         = COMEDI_SUBD_AO;
 131         s->subdev_flags = SDF_WRITABLE;
 132         s->n_chan       = 4;
 133         s->maxdata      = 0x0fff;
 134         s->range_table  = &pci1720_ao_range;
 135         s->insn_write   = pci1720_ao_insn_write;
 136
 137         ret = comedi_alloc_subdev_readback(s);
 138         if (ret)
 139                 return ret;
 140
 141         /* Digital Input subdevice (BoardID SW1) */
 142         s = &dev->subdevices[1];
 143         s->type         = COMEDI_SUBD_DI;
 144         s->subdev_flags = SDF_READABLE;
 145         s->n_chan       = 4;
 146         s->maxdata      = 1;
 147         s->range_table  = &range_digital;
 148         s->insn_bits    = pci1720_di_insn_bits;
 149
 150         /* disable synchronized output, channels update when written */
 151         outb(0, dev->iobase + PCI1720_SYNC_CTRL_REG);
 152
 153         return 0;
 154 }
 155
 156 static struct comedi_driver adv_pci1720_driver = {
 157         .driver_name    = "adv_pci1720",
 158         .module         = THIS_MODULE,
 159         .auto_attach    = pci1720_auto_attach,
 160         .detach         = comedi_pci_detach,
 161 };
 162
 163 static int adv_pci1720_pci_probe(struct pci_dev *dev,
 164                                  const struct pci_device_id *id)
 165 {
 166         return comedi_pci_auto_config(dev, &adv_pci1720_driver,
 167                                       id->driver_data);
 168 }
 169
 170 static const struct pci_device_id adv_pci1720_pci_table[] = {
 171         { PCI_DEVICE(PCI_VENDOR_ID_ADVANTECH, 0x1720) },
 172         { 0 }
 173 };
 174 MODULE_DEVICE_TABLE(pci, adv_pci1720_pci_table);
 175
 176 static struct pci_driver adv_pci1720_pci_driver = {
 177         .name           = "adv_pci1720",
 178         .id_table       = adv_pci1720_pci_table,
 179         .probe          = adv_pci1720_pci_probe,
 180         .remove         = comedi_pci_auto_unconfig,
 181 };
 182 module_comedi_pci_driver(adv_pci1720_driver, adv_pci1720_pci_driver);
 183
 184 MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
 185 MODULE_DESCRIPTION("Comedi driver for Advantech PCI-1720 Analog Output board");
 186 MODULE_LICENSE("GPL");