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Linux/drivers/staging/comedi/drivers/addi_apci_2032.c

  1 /*
  2  * addi_apci_2032.c
  3  * Copyright (C) 2004,2005  ADDI-DATA GmbH for the source code of this module.
  4  * Project manager: Eric Stolz
  5  *
  6  *      ADDI-DATA GmbH
  7  *      Dieselstrasse 3
  8  *      D-77833 Ottersweier
  9  *      Tel: +19(0)7223/9493-0
 10  *      Fax: +49(0)7223/9493-92
 11  *      http://www.addi-data.com
 12  *      info@addi-data.com
 13  *
 14  * This program is free software; you can redistribute it and/or modify it
 15  * under the terms of the GNU General Public License as published by the
 16  * Free Software Foundation; either version 2 of the License, or (at your
 17  * option) any later version.
 18  *
 19  * This program is distributed in the hope that it will be useful, but WITHOUT
 20  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 21  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 22  * more details.
 23  */
 24 
 25 #include <linux/module.h>
 26 #include <linux/pci.h>
 27 #include <linux/interrupt.h>
 28 #include <linux/slab.h>
 29 
 30 #include "../comedidev.h"
 31 #include "addi_watchdog.h"
 32 #include "comedi_fc.h"
 33 
 34 /*
 35  * PCI bar 1 I/O Register map
 36  */
 37 #define APCI2032_DO_REG                 0x00
 38 #define APCI2032_INT_CTRL_REG           0x04
 39 #define APCI2032_INT_CTRL_VCC_ENA       (1 << 0)
 40 #define APCI2032_INT_CTRL_CC_ENA        (1 << 1)
 41 #define APCI2032_INT_STATUS_REG         0x08
 42 #define APCI2032_INT_STATUS_VCC         (1 << 0)
 43 #define APCI2032_INT_STATUS_CC          (1 << 1)
 44 #define APCI2032_STATUS_REG             0x0c
 45 #define APCI2032_STATUS_IRQ             (1 << 0)
 46 #define APCI2032_WDOG_REG               0x10
 47 
 48 struct apci2032_int_private {
 49         spinlock_t spinlock;
 50         unsigned int stop_count;
 51         bool active;
 52         unsigned char enabled_isns;
 53 };
 54 
 55 static int apci2032_do_insn_bits(struct comedi_device *dev,
 56                                  struct comedi_subdevice *s,
 57                                  struct comedi_insn *insn,
 58                                  unsigned int *data)
 59 {
 60         s->state = inl(dev->iobase + APCI2032_DO_REG);
 61 
 62         if (comedi_dio_update_state(s, data))
 63                 outl(s->state, dev->iobase + APCI2032_DO_REG);
 64 
 65         data[1] = s->state;
 66 
 67         return insn->n;
 68 }
 69 
 70 static int apci2032_int_insn_bits(struct comedi_device *dev,
 71                                   struct comedi_subdevice *s,
 72                                   struct comedi_insn *insn,
 73                                   unsigned int *data)
 74 {
 75         data[1] = inl(dev->iobase + APCI2032_INT_STATUS_REG) & 3;
 76         return insn->n;
 77 }
 78 
 79 static void apci2032_int_stop(struct comedi_device *dev,
 80                               struct comedi_subdevice *s)
 81 {
 82         struct apci2032_int_private *subpriv = s->private;
 83 
 84         subpriv->active = false;
 85         subpriv->enabled_isns = 0;
 86         outl(0x0, dev->iobase + APCI2032_INT_CTRL_REG);
 87 }
 88 
 89 static int apci2032_int_cmdtest(struct comedi_device *dev,
 90                                 struct comedi_subdevice *s,
 91                                 struct comedi_cmd *cmd)
 92 {
 93         int err = 0;
 94 
 95         /* Step 1 : check if triggers are trivially valid */
 96 
 97         err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
 98         err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
 99         err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_NOW);
100         err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
101         err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
102 
103         if (err)
104                 return 1;
105 
106         /* Step 2a : make sure trigger sources are unique */
107         err |= cfc_check_trigger_is_unique(cmd->stop_src);
108 
109         /* Step 2b : and mutually compatible */
110 
111         if (err)
112                 return 2;
113 
114         /* Step 3: check if arguments are trivially valid */
115 
116         err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
117         err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
118         err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
119         err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
120         if (cmd->stop_src == TRIG_COUNT)
121                 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
122         else    /* TRIG_NONE */
123                 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
124 
125         if (err)
126                 return 3;
127 
128         /* Step 4: fix up any arguments */
129 
130         /* Step 5: check channel list if it exists */
131 
132         return 0;
133 }
134 
135 static int apci2032_int_cmd(struct comedi_device *dev,
136                             struct comedi_subdevice *s)
137 {
138         struct comedi_cmd *cmd = &s->async->cmd;
139         struct apci2032_int_private *subpriv = s->private;
140         unsigned char enabled_isns;
141         unsigned int n;
142         unsigned long flags;
143 
144         enabled_isns = 0;
145         for (n = 0; n < cmd->chanlist_len; n++)
146                 enabled_isns |= 1 << CR_CHAN(cmd->chanlist[n]);
147 
148         spin_lock_irqsave(&subpriv->spinlock, flags);
149 
150         subpriv->enabled_isns = enabled_isns;
151         subpriv->stop_count = cmd->stop_arg;
152         subpriv->active = true;
153         outl(enabled_isns, dev->iobase + APCI2032_INT_CTRL_REG);
154 
155         spin_unlock_irqrestore(&subpriv->spinlock, flags);
156 
157         return 0;
158 }
159 
160 static int apci2032_int_cancel(struct comedi_device *dev,
161                                struct comedi_subdevice *s)
162 {
163         struct apci2032_int_private *subpriv = s->private;
164         unsigned long flags;
165 
166         spin_lock_irqsave(&subpriv->spinlock, flags);
167         if (subpriv->active)
168                 apci2032_int_stop(dev, s);
169         spin_unlock_irqrestore(&subpriv->spinlock, flags);
170 
171         return 0;
172 }
173 
174 static irqreturn_t apci2032_interrupt(int irq, void *d)
175 {
176         struct comedi_device *dev = d;
177         struct comedi_subdevice *s = dev->read_subdev;
178         struct comedi_cmd *cmd = &s->async->cmd;
179         struct apci2032_int_private *subpriv;
180         unsigned int val;
181         bool do_event = false;
182 
183         if (!dev->attached)
184                 return IRQ_NONE;
185 
186         /* Check if VCC OR CC interrupt has occurred */
187         val = inl(dev->iobase + APCI2032_STATUS_REG) & APCI2032_STATUS_IRQ;
188         if (!val)
189                 return IRQ_NONE;
190 
191         subpriv = s->private;
192         spin_lock(&subpriv->spinlock);
193 
194         val = inl(dev->iobase + APCI2032_INT_STATUS_REG) & 3;
195         /* Disable triggered interrupt sources. */
196         outl(~val & 3, dev->iobase + APCI2032_INT_CTRL_REG);
197         /*
198          * Note: We don't reenable the triggered interrupt sources because they
199          * are level-sensitive, hardware error status interrupt sources and
200          * they'd keep triggering interrupts repeatedly.
201          */
202 
203         if (subpriv->active && (val & subpriv->enabled_isns) != 0) {
204                 unsigned short bits = 0;
205                 int i;
206 
207                 /* Bits in scan data correspond to indices in channel list. */
208                 for (i = 0; i < cmd->chanlist_len; i++) {
209                         unsigned int chan = CR_CHAN(cmd->chanlist[i]);
210 
211                         if (val & (1 << chan))
212                                 bits |= (1 << i);
213                 }
214 
215                 if (comedi_buf_put(s, bits)) {
216                         s->async->events |= COMEDI_CB_BLOCK | COMEDI_CB_EOS;
217                         if (cmd->stop_src == TRIG_COUNT &&
218                             subpriv->stop_count > 0) {
219                                 subpriv->stop_count--;
220                                 if (subpriv->stop_count == 0) {
221                                         /* end of acquisition */
222                                         s->async->events |= COMEDI_CB_EOA;
223                                         apci2032_int_stop(dev, s);
224                                 }
225                         }
226                 } else {
227                         apci2032_int_stop(dev, s);
228                         s->async->events |= COMEDI_CB_OVERFLOW;
229                 }
230                 do_event = true;
231         }
232 
233         spin_unlock(&subpriv->spinlock);
234         if (do_event)
235                 comedi_event(dev, s);
236 
237         return IRQ_HANDLED;
238 }
239 
240 static int apci2032_reset(struct comedi_device *dev)
241 {
242         outl(0x0, dev->iobase + APCI2032_DO_REG);
243         outl(0x0, dev->iobase + APCI2032_INT_CTRL_REG);
244 
245         addi_watchdog_reset(dev->iobase + APCI2032_WDOG_REG);
246 
247         return 0;
248 }
249 
250 static int apci2032_auto_attach(struct comedi_device *dev,
251                                 unsigned long context_unused)
252 {
253         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
254         struct comedi_subdevice *s;
255         int ret;
256 
257         ret = comedi_pci_enable(dev);
258         if (ret)
259                 return ret;
260         dev->iobase = pci_resource_start(pcidev, 1);
261         apci2032_reset(dev);
262 
263         if (pcidev->irq > 0) {
264                 ret = request_irq(pcidev->irq, apci2032_interrupt,
265                                   IRQF_SHARED, dev->board_name, dev);
266                 if (ret == 0)
267                         dev->irq = pcidev->irq;
268         }
269 
270         ret = comedi_alloc_subdevices(dev, 3);
271         if (ret)
272                 return ret;
273 
274         /* Initialize the digital output subdevice */
275         s = &dev->subdevices[0];
276         s->type         = COMEDI_SUBD_DO;
277         s->subdev_flags = SDF_WRITEABLE;
278         s->n_chan       = 32;
279         s->maxdata      = 1;
280         s->range_table  = &range_digital;
281         s->insn_bits    = apci2032_do_insn_bits;
282 
283         /* Initialize the watchdog subdevice */
284         s = &dev->subdevices[1];
285         ret = addi_watchdog_init(s, dev->iobase + APCI2032_WDOG_REG);
286         if (ret)
287                 return ret;
288 
289         /* Initialize the interrupt subdevice */
290         s = &dev->subdevices[2];
291         s->type         = COMEDI_SUBD_DI;
292         s->subdev_flags = SDF_READABLE;
293         s->n_chan       = 2;
294         s->maxdata      = 1;
295         s->range_table  = &range_digital;
296         s->insn_bits    = apci2032_int_insn_bits;
297         if (dev->irq) {
298                 struct apci2032_int_private *subpriv;
299 
300                 dev->read_subdev = s;
301                 subpriv = kzalloc(sizeof(*subpriv), GFP_KERNEL);
302                 if (!subpriv)
303                         return -ENOMEM;
304                 spin_lock_init(&subpriv->spinlock);
305                 s->private      = subpriv;
306                 s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
307                 s->len_chanlist = 2;
308                 s->do_cmdtest   = apci2032_int_cmdtest;
309                 s->do_cmd       = apci2032_int_cmd;
310                 s->cancel       = apci2032_int_cancel;
311         }
312 
313         return 0;
314 }
315 
316 static void apci2032_detach(struct comedi_device *dev)
317 {
318         if (dev->iobase)
319                 apci2032_reset(dev);
320         comedi_pci_detach(dev);
321         if (dev->read_subdev)
322                 kfree(dev->read_subdev->private);
323 }
324 
325 static struct comedi_driver apci2032_driver = {
326         .driver_name    = "addi_apci_2032",
327         .module         = THIS_MODULE,
328         .auto_attach    = apci2032_auto_attach,
329         .detach         = apci2032_detach,
330 };
331 
332 static int apci2032_pci_probe(struct pci_dev *dev,
333                               const struct pci_device_id *id)
334 {
335         return comedi_pci_auto_config(dev, &apci2032_driver, id->driver_data);
336 }
337 
338 static const struct pci_device_id apci2032_pci_table[] = {
339         { PCI_DEVICE(PCI_VENDOR_ID_ADDIDATA, 0x1004) },
340         { 0 }
341 };
342 MODULE_DEVICE_TABLE(pci, apci2032_pci_table);
343 
344 static struct pci_driver apci2032_pci_driver = {
345         .name           = "addi_apci_2032",
346         .id_table       = apci2032_pci_table,
347         .probe          = apci2032_pci_probe,
348         .remove         = comedi_pci_auto_unconfig,
349 };
350 module_comedi_pci_driver(apci2032_driver, apci2032_pci_driver);
351 
352 MODULE_AUTHOR("Comedi http://www.comedi.org");
353 MODULE_DESCRIPTION("ADDI-DATA APCI-2032, 32 channel DO boards");
354 MODULE_LICENSE("GPL");
355 

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