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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         bool active;
 51         unsigned char enabled_isns;
 52 };
 53 
 54 static int apci2032_do_insn_bits(struct comedi_device *dev,
 55                                  struct comedi_subdevice *s,
 56                                  struct comedi_insn *insn,
 57                                  unsigned int *data)
 58 {
 59         s->state = inl(dev->iobase + APCI2032_DO_REG);
 60 
 61         if (comedi_dio_update_state(s, data))
 62                 outl(s->state, dev->iobase + APCI2032_DO_REG);
 63 
 64         data[1] = s->state;
 65 
 66         return insn->n;
 67 }
 68 
 69 static int apci2032_int_insn_bits(struct comedi_device *dev,
 70                                   struct comedi_subdevice *s,
 71                                   struct comedi_insn *insn,
 72                                   unsigned int *data)
 73 {
 74         data[1] = inl(dev->iobase + APCI2032_INT_STATUS_REG) & 3;
 75         return insn->n;
 76 }
 77 
 78 static void apci2032_int_stop(struct comedi_device *dev,
 79                               struct comedi_subdevice *s)
 80 {
 81         struct apci2032_int_private *subpriv = s->private;
 82 
 83         subpriv->active = false;
 84         subpriv->enabled_isns = 0;
 85         outl(0x0, dev->iobase + APCI2032_INT_CTRL_REG);
 86 }
 87 
 88 static int apci2032_int_cmdtest(struct comedi_device *dev,
 89                                 struct comedi_subdevice *s,
 90                                 struct comedi_cmd *cmd)
 91 {
 92         int err = 0;
 93 
 94         /* Step 1 : check if triggers are trivially valid */
 95 
 96         err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
 97         err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
 98         err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_NOW);
 99         err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
100         err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
101 
102         if (err)
103                 return 1;
104 
105         /* Step 2a : make sure trigger sources are unique */
106         err |= cfc_check_trigger_is_unique(cmd->stop_src);
107 
108         /* Step 2b : and mutually compatible */
109 
110         if (err)
111                 return 2;
112 
113         /* Step 3: check if arguments are trivially valid */
114 
115         err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
116         err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
117         err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
118         err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
119         if (cmd->stop_src == TRIG_COUNT)
120                 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
121         else    /* TRIG_NONE */
122                 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
123 
124         if (err)
125                 return 3;
126 
127         /* Step 4: fix up any arguments */
128 
129         /* Step 5: check channel list if it exists */
130 
131         return 0;
132 }
133 
134 static int apci2032_int_cmd(struct comedi_device *dev,
135                             struct comedi_subdevice *s)
136 {
137         struct comedi_cmd *cmd = &s->async->cmd;
138         struct apci2032_int_private *subpriv = s->private;
139         unsigned char enabled_isns;
140         unsigned int n;
141         unsigned long flags;
142 
143         enabled_isns = 0;
144         for (n = 0; n < cmd->chanlist_len; n++)
145                 enabled_isns |= 1 << CR_CHAN(cmd->chanlist[n]);
146 
147         spin_lock_irqsave(&subpriv->spinlock, flags);
148 
149         subpriv->enabled_isns = enabled_isns;
150         subpriv->active = true;
151         outl(enabled_isns, dev->iobase + APCI2032_INT_CTRL_REG);
152 
153         spin_unlock_irqrestore(&subpriv->spinlock, flags);
154 
155         return 0;
156 }
157 
158 static int apci2032_int_cancel(struct comedi_device *dev,
159                                struct comedi_subdevice *s)
160 {
161         struct apci2032_int_private *subpriv = s->private;
162         unsigned long flags;
163 
164         spin_lock_irqsave(&subpriv->spinlock, flags);
165         if (subpriv->active)
166                 apci2032_int_stop(dev, s);
167         spin_unlock_irqrestore(&subpriv->spinlock, flags);
168 
169         return 0;
170 }
171 
172 static irqreturn_t apci2032_interrupt(int irq, void *d)
173 {
174         struct comedi_device *dev = d;
175         struct comedi_subdevice *s = dev->read_subdev;
176         struct comedi_cmd *cmd = &s->async->cmd;
177         struct apci2032_int_private *subpriv;
178         unsigned int val;
179 
180         if (!dev->attached)
181                 return IRQ_NONE;
182 
183         /* Check if VCC OR CC interrupt has occurred */
184         val = inl(dev->iobase + APCI2032_STATUS_REG) & APCI2032_STATUS_IRQ;
185         if (!val)
186                 return IRQ_NONE;
187 
188         subpriv = s->private;
189         spin_lock(&subpriv->spinlock);
190 
191         val = inl(dev->iobase + APCI2032_INT_STATUS_REG) & 3;
192         /* Disable triggered interrupt sources. */
193         outl(~val & 3, dev->iobase + APCI2032_INT_CTRL_REG);
194         /*
195          * Note: We don't reenable the triggered interrupt sources because they
196          * are level-sensitive, hardware error status interrupt sources and
197          * they'd keep triggering interrupts repeatedly.
198          */
199 
200         if (subpriv->active && (val & subpriv->enabled_isns) != 0) {
201                 unsigned short bits = 0;
202                 int i;
203 
204                 /* Bits in scan data correspond to indices in channel list. */
205                 for (i = 0; i < cmd->chanlist_len; i++) {
206                         unsigned int chan = CR_CHAN(cmd->chanlist[i]);
207 
208                         if (val & (1 << chan))
209                                 bits |= (1 << i);
210                 }
211 
212                 comedi_buf_write_samples(s, &bits, 1);
213 
214                 if (cmd->stop_src == TRIG_COUNT &&
215                     s->async->scans_done >= cmd->stop_arg)
216                         s->async->events |= COMEDI_CB_EOA;
217         }
218 
219         spin_unlock(&subpriv->spinlock);
220 
221         comedi_handle_events(dev, s);
222 
223         return IRQ_HANDLED;
224 }
225 
226 static int apci2032_reset(struct comedi_device *dev)
227 {
228         outl(0x0, dev->iobase + APCI2032_DO_REG);
229         outl(0x0, dev->iobase + APCI2032_INT_CTRL_REG);
230 
231         addi_watchdog_reset(dev->iobase + APCI2032_WDOG_REG);
232 
233         return 0;
234 }
235 
236 static int apci2032_auto_attach(struct comedi_device *dev,
237                                 unsigned long context_unused)
238 {
239         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
240         struct comedi_subdevice *s;
241         int ret;
242 
243         ret = comedi_pci_enable(dev);
244         if (ret)
245                 return ret;
246         dev->iobase = pci_resource_start(pcidev, 1);
247         apci2032_reset(dev);
248 
249         if (pcidev->irq > 0) {
250                 ret = request_irq(pcidev->irq, apci2032_interrupt,
251                                   IRQF_SHARED, dev->board_name, dev);
252                 if (ret == 0)
253                         dev->irq = pcidev->irq;
254         }
255 
256         ret = comedi_alloc_subdevices(dev, 3);
257         if (ret)
258                 return ret;
259 
260         /* Initialize the digital output subdevice */
261         s = &dev->subdevices[0];
262         s->type         = COMEDI_SUBD_DO;
263         s->subdev_flags = SDF_WRITABLE;
264         s->n_chan       = 32;
265         s->maxdata      = 1;
266         s->range_table  = &range_digital;
267         s->insn_bits    = apci2032_do_insn_bits;
268 
269         /* Initialize the watchdog subdevice */
270         s = &dev->subdevices[1];
271         ret = addi_watchdog_init(s, dev->iobase + APCI2032_WDOG_REG);
272         if (ret)
273                 return ret;
274 
275         /* Initialize the interrupt subdevice */
276         s = &dev->subdevices[2];
277         s->type         = COMEDI_SUBD_DI;
278         s->subdev_flags = SDF_READABLE;
279         s->n_chan       = 2;
280         s->maxdata      = 1;
281         s->range_table  = &range_digital;
282         s->insn_bits    = apci2032_int_insn_bits;
283         if (dev->irq) {
284                 struct apci2032_int_private *subpriv;
285 
286                 dev->read_subdev = s;
287                 subpriv = kzalloc(sizeof(*subpriv), GFP_KERNEL);
288                 if (!subpriv)
289                         return -ENOMEM;
290                 spin_lock_init(&subpriv->spinlock);
291                 s->private      = subpriv;
292                 s->subdev_flags = SDF_READABLE | SDF_CMD_READ | SDF_PACKED;
293                 s->len_chanlist = 2;
294                 s->do_cmdtest   = apci2032_int_cmdtest;
295                 s->do_cmd       = apci2032_int_cmd;
296                 s->cancel       = apci2032_int_cancel;
297         }
298 
299         return 0;
300 }
301 
302 static void apci2032_detach(struct comedi_device *dev)
303 {
304         if (dev->iobase)
305                 apci2032_reset(dev);
306         comedi_pci_detach(dev);
307         if (dev->read_subdev)
308                 kfree(dev->read_subdev->private);
309 }
310 
311 static struct comedi_driver apci2032_driver = {
312         .driver_name    = "addi_apci_2032",
313         .module         = THIS_MODULE,
314         .auto_attach    = apci2032_auto_attach,
315         .detach         = apci2032_detach,
316 };
317 
318 static int apci2032_pci_probe(struct pci_dev *dev,
319                               const struct pci_device_id *id)
320 {
321         return comedi_pci_auto_config(dev, &apci2032_driver, id->driver_data);
322 }
323 
324 static const struct pci_device_id apci2032_pci_table[] = {
325         { PCI_DEVICE(PCI_VENDOR_ID_ADDIDATA, 0x1004) },
326         { 0 }
327 };
328 MODULE_DEVICE_TABLE(pci, apci2032_pci_table);
329 
330 static struct pci_driver apci2032_pci_driver = {
331         .name           = "addi_apci_2032",
332         .id_table       = apci2032_pci_table,
333         .probe          = apci2032_pci_probe,
334         .remove         = comedi_pci_auto_unconfig,
335 };
336 module_comedi_pci_driver(apci2032_driver, apci2032_pci_driver);
337 
338 MODULE_AUTHOR("Comedi http://www.comedi.org");
339 MODULE_DESCRIPTION("ADDI-DATA APCI-2032, 32 channel DO boards");
340 MODULE_LICENSE("GPL");
341 

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