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Linux/drivers/staging/comedi/drivers/icp_multi.c

  1 /*
  2     comedi/drivers/icp_multi.c
  3 
  4     COMEDI - Linux Control and Measurement Device Interface
  5     Copyright (C) 1997-2002 David A. Schleef <ds@schleef.org>
  6 
  7     This program is free software; you can redistribute it and/or modify
  8     it under the terms of the GNU General Public License as published by
  9     the Free Software Foundation; either version 2 of the License, or
 10     (at your option) any later version.
 11 
 12     This program is distributed in the hope that it will be useful,
 13     but WITHOUT ANY WARRANTY; without even the implied warranty of
 14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15     GNU General Public License for more details.
 16 */
 17 
 18 /*
 19 Driver: icp_multi
 20 Description: Inova ICP_MULTI
 21 Author: Anne Smorthit <anne.smorthit@sfwte.ch>
 22 Devices: [Inova] ICP_MULTI (icp_multi)
 23 Status: works
 24 
 25 The driver works for analog input and output and digital input and output.
 26 It does not work with interrupts or with the counters.  Currently no support
 27 for DMA.
 28 
 29 It has 16 single-ended or 8 differential Analogue Input channels with 12-bit
 30 resolution.  Ranges : 5V, 10V, +/-5V, +/-10V, 0..20mA and 4..20mA.  Input
 31 ranges can be individually programmed for each channel.  Voltage or current
 32 measurement is selected by jumper.
 33 
 34 There are 4 x 12-bit Analogue Outputs.  Ranges : 5V, 10V, +/-5V, +/-10V
 35 
 36 16 x Digital Inputs, 24V
 37 
 38 8 x Digital Outputs, 24V, 1A
 39 
 40 4 x 16-bit counters
 41 
 42 Configuration options: not applicable, uses PCI auto config
 43 */
 44 
 45 #include <linux/module.h>
 46 #include <linux/pci.h>
 47 #include <linux/delay.h>
 48 #include <linux/interrupt.h>
 49 
 50 #include "../comedidev.h"
 51 
 52 #define ICP_MULTI_ADC_CSR       0       /* R/W: ADC command/status register */
 53 #define ICP_MULTI_AI            2       /* R:   Analogue input data */
 54 #define ICP_MULTI_DAC_CSR       4       /* R/W: DAC command/status register */
 55 #define ICP_MULTI_AO            6       /* R/W: Analogue output data */
 56 #define ICP_MULTI_DI            8       /* R/W: Digital inouts */
 57 #define ICP_MULTI_DO            0x0A    /* R/W: Digital outputs */
 58 #define ICP_MULTI_INT_EN        0x0C    /* R/W: Interrupt enable register */
 59 #define ICP_MULTI_INT_STAT      0x0E    /* R/W: Interrupt status register */
 60 #define ICP_MULTI_CNTR0         0x10    /* R/W: Counter 0 */
 61 #define ICP_MULTI_CNTR1         0x12    /* R/W: counter 1 */
 62 #define ICP_MULTI_CNTR2         0x14    /* R/W: Counter 2 */
 63 #define ICP_MULTI_CNTR3         0x16    /* R/W: Counter 3 */
 64 
 65 /*  Define bits from ADC command/status register */
 66 #define ADC_ST          0x0001  /* Start ADC */
 67 #define ADC_BSY         0x0001  /* ADC busy */
 68 #define ADC_BI          0x0010  /* Bipolar input range 1 = bipolar */
 69 #define ADC_RA          0x0020  /* Input range 0 = 5V, 1 = 10V */
 70 #define ADC_DI          0x0040  /* Differential input mode 1 = differential */
 71 
 72 /*  Define bits from DAC command/status register */
 73 #define DAC_ST          0x0001  /* Start DAC */
 74 #define DAC_BSY         0x0001  /* DAC busy */
 75 #define DAC_BI          0x0010  /* Bipolar input range 1 = bipolar */
 76 #define DAC_RA          0x0020  /* Input range 0 = 5V, 1 = 10V */
 77 
 78 /*  Define bits from interrupt enable/status registers */
 79 #define ADC_READY       0x0001  /* A/d conversion ready interrupt */
 80 #define DAC_READY       0x0002  /* D/a conversion ready interrupt */
 81 #define DOUT_ERROR      0x0004  /* Digital output error interrupt */
 82 #define DIN_STATUS      0x0008  /* Digital input status change interrupt */
 83 #define CIE0            0x0010  /* Counter 0 overrun interrupt */
 84 #define CIE1            0x0020  /* Counter 1 overrun interrupt */
 85 #define CIE2            0x0040  /* Counter 2 overrun interrupt */
 86 #define CIE3            0x0080  /* Counter 3 overrun interrupt */
 87 
 88 /*  Useful definitions */
 89 #define Status_IRQ      0x00ff  /*  All interrupts */
 90 
 91 /*  Define analogue range */
 92 static const struct comedi_lrange range_analog = {
 93         4, {
 94                 UNI_RANGE(5),
 95                 UNI_RANGE(10),
 96                 BIP_RANGE(5),
 97                 BIP_RANGE(10)
 98         }
 99 };
100 
101 static const char range_codes_analog[] = { 0x00, 0x20, 0x10, 0x30 };
102 
103 /*
104 ==============================================================================
105         Data & Structure declarations
106 ==============================================================================
107 */
108 
109 struct icp_multi_private {
110         char valid;             /*  card is usable */
111         unsigned int AdcCmdStatus;      /*  ADC Command/Status register */
112         unsigned int DacCmdStatus;      /*  DAC Command/Status register */
113         unsigned int IntEnable; /*  Interrupt Enable register */
114         unsigned int IntStatus; /*  Interrupt Status register */
115         unsigned int act_chanlist[32];  /*  list of scanned channel */
116         unsigned char act_chanlist_len; /*  len of scanlist */
117         unsigned char act_chanlist_pos; /*  actual position in MUX list */
118         unsigned int *ai_chanlist;      /*  actaul chanlist */
119         unsigned short ao_data[4];      /*  data output buffer */
120         unsigned int do_data;   /*  Remember digital output data */
121 };
122 
123 static void setup_channel_list(struct comedi_device *dev,
124                                struct comedi_subdevice *s,
125                                unsigned int *chanlist, unsigned int n_chan)
126 {
127         struct icp_multi_private *devpriv = dev->private;
128         unsigned int i, range, chanprog;
129         unsigned int diff;
130 
131         devpriv->act_chanlist_len = n_chan;
132         devpriv->act_chanlist_pos = 0;
133 
134         for (i = 0; i < n_chan; i++) {
135                 /*  Get channel */
136                 chanprog = CR_CHAN(chanlist[i]);
137 
138                 /*  Determine if it is a differential channel (Bit 15  = 1) */
139                 if (CR_AREF(chanlist[i]) == AREF_DIFF) {
140                         diff = 1;
141                         chanprog &= 0x0007;
142                 } else {
143                         diff = 0;
144                         chanprog &= 0x000f;
145                 }
146 
147                 /*  Clear channel, range and input mode bits
148                  *  in A/D command/status register */
149                 devpriv->AdcCmdStatus &= 0xf00f;
150 
151                 /*  Set channel number and differential mode status bit */
152                 if (diff) {
153                         /*  Set channel number, bits 9-11 & mode, bit 6 */
154                         devpriv->AdcCmdStatus |= (chanprog << 9);
155                         devpriv->AdcCmdStatus |= ADC_DI;
156                 } else
157                         /*  Set channel number, bits 8-11 */
158                         devpriv->AdcCmdStatus |= (chanprog << 8);
159 
160                 /*  Get range for current channel */
161                 range = range_codes_analog[CR_RANGE(chanlist[i])];
162                 /*  Set range. bits 4-5 */
163                 devpriv->AdcCmdStatus |= range;
164 
165                 /* Output channel, range, mode to ICP Multi */
166                 writew(devpriv->AdcCmdStatus, dev->mmio + ICP_MULTI_ADC_CSR);
167         }
168 }
169 
170 static int icp_multi_ai_eoc(struct comedi_device *dev,
171                             struct comedi_subdevice *s,
172                             struct comedi_insn *insn,
173                             unsigned long context)
174 {
175         unsigned int status;
176 
177         status = readw(dev->mmio + ICP_MULTI_ADC_CSR);
178         if ((status & ADC_BSY) == 0)
179                 return 0;
180         return -EBUSY;
181 }
182 
183 static int icp_multi_insn_read_ai(struct comedi_device *dev,
184                                   struct comedi_subdevice *s,
185                                   struct comedi_insn *insn,
186                                   unsigned int *data)
187 {
188         struct icp_multi_private *devpriv = dev->private;
189         int ret = 0;
190         int n;
191 
192         /*  Disable A/D conversion ready interrupt */
193         devpriv->IntEnable &= ~ADC_READY;
194         writew(devpriv->IntEnable, dev->mmio + ICP_MULTI_INT_EN);
195 
196         /*  Clear interrupt status */
197         devpriv->IntStatus |= ADC_READY;
198         writew(devpriv->IntStatus, dev->mmio + ICP_MULTI_INT_STAT);
199 
200         /*  Set up appropriate channel, mode and range data, for specified ch */
201         setup_channel_list(dev, s, &insn->chanspec, 1);
202 
203         for (n = 0; n < insn->n; n++) {
204                 /*  Set start ADC bit */
205                 devpriv->AdcCmdStatus |= ADC_ST;
206                 writew(devpriv->AdcCmdStatus, dev->mmio + ICP_MULTI_ADC_CSR);
207                 devpriv->AdcCmdStatus &= ~ADC_ST;
208 
209                 udelay(1);
210 
211                 /*  Wait for conversion to complete, or get fed up waiting */
212                 ret = comedi_timeout(dev, s, insn, icp_multi_ai_eoc, 0);
213                 if (ret)
214                         break;
215 
216                 data[n] = (readw(dev->mmio + ICP_MULTI_AI) >> 4) & 0x0fff;
217         }
218 
219         /*  Disable interrupt */
220         devpriv->IntEnable &= ~ADC_READY;
221         writew(devpriv->IntEnable, dev->mmio + ICP_MULTI_INT_EN);
222 
223         /*  Clear interrupt status */
224         devpriv->IntStatus |= ADC_READY;
225         writew(devpriv->IntStatus, dev->mmio + ICP_MULTI_INT_STAT);
226 
227         return ret ? ret : n;
228 }
229 
230 static int icp_multi_ao_eoc(struct comedi_device *dev,
231                             struct comedi_subdevice *s,
232                             struct comedi_insn *insn,
233                             unsigned long context)
234 {
235         unsigned int status;
236 
237         status = readw(dev->mmio + ICP_MULTI_DAC_CSR);
238         if ((status & DAC_BSY) == 0)
239                 return 0;
240         return -EBUSY;
241 }
242 
243 static int icp_multi_insn_write_ao(struct comedi_device *dev,
244                                    struct comedi_subdevice *s,
245                                    struct comedi_insn *insn,
246                                    unsigned int *data)
247 {
248         struct icp_multi_private *devpriv = dev->private;
249         int n, chan, range;
250         int ret;
251 
252         /*  Disable D/A conversion ready interrupt */
253         devpriv->IntEnable &= ~DAC_READY;
254         writew(devpriv->IntEnable, dev->mmio + ICP_MULTI_INT_EN);
255 
256         /*  Clear interrupt status */
257         devpriv->IntStatus |= DAC_READY;
258         writew(devpriv->IntStatus, dev->mmio + ICP_MULTI_INT_STAT);
259 
260         /*  Get channel number and range */
261         chan = CR_CHAN(insn->chanspec);
262         range = CR_RANGE(insn->chanspec);
263 
264         /*  Set up range and channel data */
265         /*  Bit 4 = 1 : Bipolar */
266         /*  Bit 5 = 0 : 5V */
267         /*  Bit 5 = 1 : 10V */
268         /*  Bits 8-9 : Channel number */
269         devpriv->DacCmdStatus &= 0xfccf;
270         devpriv->DacCmdStatus |= range_codes_analog[range];
271         devpriv->DacCmdStatus |= (chan << 8);
272 
273         writew(devpriv->DacCmdStatus, dev->mmio + ICP_MULTI_DAC_CSR);
274 
275         for (n = 0; n < insn->n; n++) {
276                 /*  Wait for analogue output data register to be
277                  *  ready for new data, or get fed up waiting */
278                 ret = comedi_timeout(dev, s, insn, icp_multi_ao_eoc, 0);
279                 if (ret) {
280                         /*  Disable interrupt */
281                         devpriv->IntEnable &= ~DAC_READY;
282                         writew(devpriv->IntEnable,
283                                dev->mmio + ICP_MULTI_INT_EN);
284 
285                         /*  Clear interrupt status */
286                         devpriv->IntStatus |= DAC_READY;
287                         writew(devpriv->IntStatus,
288                                dev->mmio + ICP_MULTI_INT_STAT);
289 
290                         /*  Clear data received */
291                         devpriv->ao_data[chan] = 0;
292 
293                         return ret;
294                 }
295 
296                 /*  Write data to analogue output data register */
297                 writew(data[n], dev->mmio + ICP_MULTI_AO);
298 
299                 /*  Set DAC_ST bit to write the data to selected channel */
300                 devpriv->DacCmdStatus |= DAC_ST;
301                 writew(devpriv->DacCmdStatus, dev->mmio + ICP_MULTI_DAC_CSR);
302                 devpriv->DacCmdStatus &= ~DAC_ST;
303 
304                 /*  Save analogue output data */
305                 devpriv->ao_data[chan] = data[n];
306         }
307 
308         return n;
309 }
310 
311 static int icp_multi_insn_read_ao(struct comedi_device *dev,
312                                   struct comedi_subdevice *s,
313                                   struct comedi_insn *insn, unsigned int *data)
314 {
315         struct icp_multi_private *devpriv = dev->private;
316         int n, chan;
317 
318         /*  Get channel number */
319         chan = CR_CHAN(insn->chanspec);
320 
321         /*  Read analogue outputs */
322         for (n = 0; n < insn->n; n++)
323                 data[n] = devpriv->ao_data[chan];
324 
325         return n;
326 }
327 
328 static int icp_multi_insn_bits_di(struct comedi_device *dev,
329                                   struct comedi_subdevice *s,
330                                   struct comedi_insn *insn,
331                                   unsigned int *data)
332 {
333         data[1] = readw(dev->mmio + ICP_MULTI_DI);
334 
335         return insn->n;
336 }
337 
338 static int icp_multi_insn_bits_do(struct comedi_device *dev,
339                                   struct comedi_subdevice *s,
340                                   struct comedi_insn *insn,
341                                   unsigned int *data)
342 {
343         if (comedi_dio_update_state(s, data))
344                 writew(s->state, dev->mmio + ICP_MULTI_DO);
345 
346         data[1] = readw(dev->mmio + ICP_MULTI_DI);
347 
348         return insn->n;
349 }
350 
351 static int icp_multi_insn_read_ctr(struct comedi_device *dev,
352                                    struct comedi_subdevice *s,
353                                    struct comedi_insn *insn, unsigned int *data)
354 {
355         return 0;
356 }
357 
358 static int icp_multi_insn_write_ctr(struct comedi_device *dev,
359                                     struct comedi_subdevice *s,
360                                     struct comedi_insn *insn,
361                                     unsigned int *data)
362 {
363         return 0;
364 }
365 
366 static irqreturn_t interrupt_service_icp_multi(int irq, void *d)
367 {
368         struct comedi_device *dev = d;
369         int int_no;
370 
371         /*  Is this interrupt from our board? */
372         int_no = readw(dev->mmio + ICP_MULTI_INT_STAT) & Status_IRQ;
373         if (!int_no)
374                 /*  No, exit */
375                 return IRQ_NONE;
376 
377         /*  Determine which interrupt is active & handle it */
378         switch (int_no) {
379         case ADC_READY:
380                 break;
381         case DAC_READY:
382                 break;
383         case DOUT_ERROR:
384                 break;
385         case DIN_STATUS:
386                 break;
387         case CIE0:
388                 break;
389         case CIE1:
390                 break;
391         case CIE2:
392                 break;
393         case CIE3:
394                 break;
395         default:
396                 break;
397 
398         }
399 
400         return IRQ_HANDLED;
401 }
402 
403 #if 0
404 static int check_channel_list(struct comedi_device *dev,
405                               struct comedi_subdevice *s,
406                               unsigned int *chanlist, unsigned int n_chan)
407 {
408         unsigned int i;
409 
410         /*  Check that we at least have one channel to check */
411         if (n_chan < 1) {
412                 dev_err(dev->class_dev, "range/channel list is empty!\n");
413                 return 0;
414         }
415         /*  Check all channels */
416         for (i = 0; i < n_chan; i++) {
417                 /*  Check that channel number is < maximum */
418                 if (CR_AREF(chanlist[i]) == AREF_DIFF) {
419                         if (CR_CHAN(chanlist[i]) > (s->nchan / 2)) {
420                                 dev_err(dev->class_dev,
421                                         "Incorrect differential ai ch-nr\n");
422                                 return 0;
423                         }
424                 } else {
425                         if (CR_CHAN(chanlist[i]) > s->n_chan) {
426                                 dev_err(dev->class_dev,
427                                         "Incorrect ai channel number\n");
428                                 return 0;
429                         }
430                 }
431         }
432         return 1;
433 }
434 #endif
435 
436 static int icp_multi_reset(struct comedi_device *dev)
437 {
438         struct icp_multi_private *devpriv = dev->private;
439         unsigned int i;
440 
441         /*  Clear INT enables and requests */
442         writew(0, dev->mmio + ICP_MULTI_INT_EN);
443         writew(0x00ff, dev->mmio + ICP_MULTI_INT_STAT);
444 
445         /* Set DACs to 0..5V range and 0V output */
446         for (i = 0; i < 4; i++) {
447                 devpriv->DacCmdStatus &= 0xfcce;
448 
449                 /*  Set channel number */
450                 devpriv->DacCmdStatus |= (i << 8);
451 
452                 /*  Output 0V */
453                 writew(0, dev->mmio + ICP_MULTI_AO);
454 
455                 /*  Set start conversion bit */
456                 devpriv->DacCmdStatus |= DAC_ST;
457 
458                 /*  Output to command / status register */
459                 writew(devpriv->DacCmdStatus, dev->mmio + ICP_MULTI_DAC_CSR);
460 
461                 /*  Delay to allow DAC time to recover */
462                 udelay(1);
463         }
464 
465         /* Digital outputs to 0 */
466         writew(0, dev->mmio + ICP_MULTI_DO);
467 
468         return 0;
469 }
470 
471 static int icp_multi_auto_attach(struct comedi_device *dev,
472                                            unsigned long context_unused)
473 {
474         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
475         struct icp_multi_private *devpriv;
476         struct comedi_subdevice *s;
477         int ret;
478 
479         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
480         if (!devpriv)
481                 return -ENOMEM;
482 
483         ret = comedi_pci_enable(dev);
484         if (ret)
485                 return ret;
486 
487         dev->mmio = pci_ioremap_bar(pcidev, 2);
488         if (!dev->mmio)
489                 return -ENOMEM;
490 
491         ret = comedi_alloc_subdevices(dev, 5);
492         if (ret)
493                 return ret;
494 
495         icp_multi_reset(dev);
496 
497         if (pcidev->irq) {
498                 ret = request_irq(pcidev->irq, interrupt_service_icp_multi,
499                                   IRQF_SHARED, dev->board_name, dev);
500                 if (ret == 0)
501                         dev->irq = pcidev->irq;
502         }
503 
504         s = &dev->subdevices[0];
505         dev->read_subdev = s;
506         s->type = COMEDI_SUBD_AI;
507         s->subdev_flags = SDF_READABLE | SDF_COMMON | SDF_GROUND | SDF_DIFF;
508         s->n_chan = 16;
509         s->maxdata = 0x0fff;
510         s->len_chanlist = 16;
511         s->range_table = &range_analog;
512         s->insn_read = icp_multi_insn_read_ai;
513 
514         s = &dev->subdevices[1];
515         s->type = COMEDI_SUBD_AO;
516         s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_COMMON;
517         s->n_chan = 4;
518         s->maxdata = 0x0fff;
519         s->len_chanlist = 4;
520         s->range_table = &range_analog;
521         s->insn_write = icp_multi_insn_write_ao;
522         s->insn_read = icp_multi_insn_read_ao;
523 
524         s = &dev->subdevices[2];
525         s->type = COMEDI_SUBD_DI;
526         s->subdev_flags = SDF_READABLE;
527         s->n_chan = 16;
528         s->maxdata = 1;
529         s->len_chanlist = 16;
530         s->range_table = &range_digital;
531         s->insn_bits = icp_multi_insn_bits_di;
532 
533         s = &dev->subdevices[3];
534         s->type = COMEDI_SUBD_DO;
535         s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
536         s->n_chan = 8;
537         s->maxdata = 1;
538         s->len_chanlist = 8;
539         s->range_table = &range_digital;
540         s->insn_bits = icp_multi_insn_bits_do;
541 
542         s = &dev->subdevices[4];
543         s->type = COMEDI_SUBD_COUNTER;
544         s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_COMMON;
545         s->n_chan = 4;
546         s->maxdata = 0xffff;
547         s->len_chanlist = 4;
548         s->state = 0;
549         s->insn_read = icp_multi_insn_read_ctr;
550         s->insn_write = icp_multi_insn_write_ctr;
551 
552         devpriv->valid = 1;
553 
554         return 0;
555 }
556 
557 static void icp_multi_detach(struct comedi_device *dev)
558 {
559         struct icp_multi_private *devpriv = dev->private;
560 
561         if (devpriv)
562                 if (devpriv->valid)
563                         icp_multi_reset(dev);
564         if (dev->irq)
565                 free_irq(dev->irq, dev);
566         if (dev->mmio)
567                 iounmap(dev->mmio);
568         comedi_pci_disable(dev);
569 }
570 
571 static struct comedi_driver icp_multi_driver = {
572         .driver_name    = "icp_multi",
573         .module         = THIS_MODULE,
574         .auto_attach    = icp_multi_auto_attach,
575         .detach         = icp_multi_detach,
576 };
577 
578 static int icp_multi_pci_probe(struct pci_dev *dev,
579                                const struct pci_device_id *id)
580 {
581         return comedi_pci_auto_config(dev, &icp_multi_driver, id->driver_data);
582 }
583 
584 static const struct pci_device_id icp_multi_pci_table[] = {
585         { PCI_DEVICE(PCI_VENDOR_ID_ICP, 0x8000) },
586         { 0 }
587 };
588 MODULE_DEVICE_TABLE(pci, icp_multi_pci_table);
589 
590 static struct pci_driver icp_multi_pci_driver = {
591         .name           = "icp_multi",
592         .id_table       = icp_multi_pci_table,
593         .probe          = icp_multi_pci_probe,
594         .remove         = comedi_pci_auto_unconfig,
595 };
596 module_comedi_pci_driver(icp_multi_driver, icp_multi_pci_driver);
597 
598 MODULE_AUTHOR("Comedi http://www.comedi.org");
599 MODULE_DESCRIPTION("Comedi low-level driver");
600 MODULE_LICENSE("GPL");
601 

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