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

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