1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * rti802.c 4 * Comedi driver for Analog Devices RTI-802 board 5 * 6 * COMEDI - Linux Control and Measurement Device Interface 7 * Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se> 8 */ 9 10 /* 11 * Driver: rti802 12 * Description: Analog Devices RTI-802 13 * Author: Anders Blomdell <anders.blomdell@control.lth.se> 14 * Devices: [Analog Devices] RTI-802 (rti802) 15 * Status: works 16 * 17 * Configuration Options: 18 * [0] - i/o base 19 * [1] - unused 20 * [2,4,6,8,10,12,14,16] - dac#[0-7] 0=two's comp, 1=straight 21 * [3,5,7,9,11,13,15,17] - dac#[0-7] 0=bipolar, 1=unipolar 22 */ 23 24 #include <linux/module.h> 25 #include <linux/comedi/comedidev.h> 26 27 /* 28 * Register I/O map 29 */ 30 #define RTI802_SELECT 0x00 31 #define RTI802_DATALOW 0x01 32 #define RTI802_DATAHIGH 0x02 33 34 struct rti802_private { 35 enum { 36 dac_2comp, dac_straight 37 } dac_coding[8]; 38 const struct comedi_lrange *range_type_list[8]; 39 }; 40 41 static int rti802_ao_insn_write(struct comedi_device *dev, 42 struct comedi_subdevice *s, 43 struct comedi_insn *insn, 44 unsigned int *data) 45 { 46 struct rti802_private *devpriv = dev->private; 47 unsigned int chan = CR_CHAN(insn->chanspec); 48 int i; 49 50 outb(chan, dev->iobase + RTI802_SELECT); 51 52 for (i = 0; i < insn->n; i++) { 53 unsigned int val = data[i]; 54 55 s->readback[chan] = val; 56 57 /* munge offset binary to two's complement if needed */ 58 if (devpriv->dac_coding[chan] == dac_2comp) 59 val = comedi_offset_munge(s, val); 60 61 outb(val & 0xff, dev->iobase + RTI802_DATALOW); 62 outb((val >> 8) & 0xff, dev->iobase + RTI802_DATAHIGH); 63 } 64 65 return insn->n; 66 } 67 68 static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it) 69 { 70 struct rti802_private *devpriv; 71 struct comedi_subdevice *s; 72 int i; 73 int ret; 74 75 ret = comedi_request_region(dev, it->options[0], 0x04); 76 if (ret) 77 return ret; 78 79 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); 80 if (!devpriv) 81 return -ENOMEM; 82 83 ret = comedi_alloc_subdevices(dev, 1); 84 if (ret) 85 return ret; 86 87 /* Analog Output subdevice */ 88 s = &dev->subdevices[0]; 89 s->type = COMEDI_SUBD_AO; 90 s->subdev_flags = SDF_WRITABLE; 91 s->maxdata = 0xfff; 92 s->n_chan = 8; 93 s->insn_write = rti802_ao_insn_write; 94 95 ret = comedi_alloc_subdev_readback(s); 96 if (ret) 97 return ret; 98 99 s->range_table_list = devpriv->range_type_list; 100 for (i = 0; i < 8; i++) { 101 devpriv->dac_coding[i] = (it->options[3 + 2 * i]) 102 ? (dac_straight) : (dac_2comp); 103 devpriv->range_type_list[i] = (it->options[2 + 2 * i]) 104 ? &range_unipolar10 : &range_bipolar10; 105 } 106 107 return 0; 108 } 109 110 static struct comedi_driver rti802_driver = { 111 .driver_name = "rti802", 112 .module = THIS_MODULE, 113 .attach = rti802_attach, 114 .detach = comedi_legacy_detach, 115 }; 116 module_comedi_driver(rti802_driver); 117 118 MODULE_AUTHOR("Comedi https://www.comedi.org"); 119 MODULE_DESCRIPTION("Comedi driver for Analog Devices RTI-802 board"); 120 MODULE_LICENSE("GPL"); 121