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Linux/drivers/staging/comedi/drivers/addi_apci_1032.c

  1 /*
  2  * addi_apci_1032.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 /*
 26  * Driver: addi_apci_1032
 27  * Description: ADDI-DATA APCI-1032 Digital Input Board
 28  * Author: ADDI-DATA GmbH <info@addi-data.com>,
 29  *   H Hartley Sweeten <hsweeten@visionengravers.com>
 30  * Status: untested
 31  * Devices: [ADDI-DATA] APCI-1032 (addi_apci_1032)
 32  *
 33  * Configuration options:
 34  *   None; devices are configured automatically.
 35  *
 36  * This driver models the APCI-1032 as a 32-channel, digital input subdevice
 37  * plus an additional digital input subdevice to handle change-of-state (COS)
 38  * interrupts (if an interrupt handler can be set up successfully).
 39  *
 40  * The COS subdevice supports comedi asynchronous read commands.
 41  *
 42  * Change-Of-State (COS) interrupt configuration:
 43  *
 44  * Channels 0 to 15 are interruptible. These channels can be configured
 45  * to generate interrupts based on AND/OR logic for the desired channels.
 46  *
 47  *   OR logic:
 48  *   - reacts to rising or falling edges
 49  *   - interrupt is generated when any enabled channel meets the desired
 50  *     interrupt condition
 51  *
 52  *   AND logic:
 53  *   - reacts to changes in level of the selected inputs
 54  *   - interrupt is generated when all enabled channels meet the desired
 55  *     interrupt condition
 56  *   - after an interrupt, a change in level must occur on the selected
 57  *     inputs to release the IRQ logic
 58  *
 59  * The COS subdevice must be configured before setting up a comedi
 60  * asynchronous command:
 61  *
 62  *   data[0] : INSN_CONFIG_DIGITAL_TRIG
 63  *   data[1] : trigger number (= 0)
 64  *   data[2] : configuration operation:
 65  *             - COMEDI_DIGITAL_TRIG_DISABLE = no interrupts
 66  *             - COMEDI_DIGITAL_TRIG_ENABLE_EDGES = OR (edge) interrupts
 67  *             - COMEDI_DIGITAL_TRIG_ENABLE_LEVELS = AND (level) interrupts
 68  *   data[3] : left-shift for data[4] and data[5]
 69  *   data[4] : rising-edge/high level channels
 70  *   data[5] : falling-edge/low level channels
 71  */
 72 
 73 #include <linux/module.h>
 74 #include <linux/interrupt.h>
 75 
 76 #include "../comedi_pci.h"
 77 #include "amcc_s5933.h"
 78 
 79 /*
 80  * I/O Register Map
 81  */
 82 #define APCI1032_DI_REG                 0x00
 83 #define APCI1032_MODE1_REG              0x04
 84 #define APCI1032_MODE2_REG              0x08
 85 #define APCI1032_STATUS_REG             0x0c
 86 #define APCI1032_CTRL_REG               0x10
 87 #define APCI1032_CTRL_INT_OR            (0 << 1)
 88 #define APCI1032_CTRL_INT_AND           (1 << 1)
 89 #define APCI1032_CTRL_INT_ENA           (1 << 2)
 90 
 91 struct apci1032_private {
 92         unsigned long amcc_iobase;      /* base of AMCC I/O registers */
 93         unsigned int mode1;     /* rising-edge/high level channels */
 94         unsigned int mode2;     /* falling-edge/low level channels */
 95         unsigned int ctrl;      /* interrupt mode OR (edge) . AND (level) */
 96 };
 97 
 98 static int apci1032_reset(struct comedi_device *dev)
 99 {
100         /* disable the interrupts */
101         outl(0x0, dev->iobase + APCI1032_CTRL_REG);
102         /* Reset the interrupt status register */
103         inl(dev->iobase + APCI1032_STATUS_REG);
104         /* Disable the and/or interrupt */
105         outl(0x0, dev->iobase + APCI1032_MODE1_REG);
106         outl(0x0, dev->iobase + APCI1032_MODE2_REG);
107 
108         return 0;
109 }
110 
111 static int apci1032_cos_insn_config(struct comedi_device *dev,
112                                     struct comedi_subdevice *s,
113                                     struct comedi_insn *insn,
114                                     unsigned int *data)
115 {
116         struct apci1032_private *devpriv = dev->private;
117         unsigned int shift, oldmask;
118 
119         switch (data[0]) {
120         case INSN_CONFIG_DIGITAL_TRIG:
121                 if (data[1] != 0)
122                         return -EINVAL;
123                 shift = data[3];
124                 oldmask = (1U << shift) - 1;
125                 switch (data[2]) {
126                 case COMEDI_DIGITAL_TRIG_DISABLE:
127                         devpriv->ctrl = 0;
128                         devpriv->mode1 = 0;
129                         devpriv->mode2 = 0;
130                         apci1032_reset(dev);
131                         break;
132                 case COMEDI_DIGITAL_TRIG_ENABLE_EDGES:
133                         if (devpriv->ctrl != (APCI1032_CTRL_INT_ENA |
134                                               APCI1032_CTRL_INT_OR)) {
135                                 /* switching to 'OR' mode */
136                                 devpriv->ctrl = APCI1032_CTRL_INT_ENA |
137                                                 APCI1032_CTRL_INT_OR;
138                                 /* wipe old channels */
139                                 devpriv->mode1 = 0;
140                                 devpriv->mode2 = 0;
141                         } else {
142                                 /* preserve unspecified channels */
143                                 devpriv->mode1 &= oldmask;
144                                 devpriv->mode2 &= oldmask;
145                         }
146                         /* configure specified channels */
147                         devpriv->mode1 |= data[4] << shift;
148                         devpriv->mode2 |= data[5] << shift;
149                         break;
150                 case COMEDI_DIGITAL_TRIG_ENABLE_LEVELS:
151                         if (devpriv->ctrl != (APCI1032_CTRL_INT_ENA |
152                                               APCI1032_CTRL_INT_AND)) {
153                                 /* switching to 'AND' mode */
154                                 devpriv->ctrl = APCI1032_CTRL_INT_ENA |
155                                                 APCI1032_CTRL_INT_AND;
156                                 /* wipe old channels */
157                                 devpriv->mode1 = 0;
158                                 devpriv->mode2 = 0;
159                         } else {
160                                 /* preserve unspecified channels */
161                                 devpriv->mode1 &= oldmask;
162                                 devpriv->mode2 &= oldmask;
163                         }
164                         /* configure specified channels */
165                         devpriv->mode1 |= data[4] << shift;
166                         devpriv->mode2 |= data[5] << shift;
167                         break;
168                 default:
169                         return -EINVAL;
170                 }
171                 break;
172         default:
173                 return -EINVAL;
174         }
175 
176         return insn->n;
177 }
178 
179 static int apci1032_cos_insn_bits(struct comedi_device *dev,
180                                   struct comedi_subdevice *s,
181                                   struct comedi_insn *insn,
182                                   unsigned int *data)
183 {
184         data[1] = s->state;
185 
186         return 0;
187 }
188 
189 static int apci1032_cos_cmdtest(struct comedi_device *dev,
190                                 struct comedi_subdevice *s,
191                                 struct comedi_cmd *cmd)
192 {
193         int err = 0;
194 
195         /* Step 1 : check if triggers are trivially valid */
196 
197         err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
198         err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
199         err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW);
200         err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
201         err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_NONE);
202 
203         if (err)
204                 return 1;
205 
206         /* Step 2a : make sure trigger sources are unique */
207         /* Step 2b : and mutually compatible */
208 
209         /* Step 3: check if arguments are trivially valid */
210 
211         err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
212         err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
213         err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
214         err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
215                                            cmd->chanlist_len);
216         err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
217 
218         if (err)
219                 return 3;
220 
221         /* Step 4: fix up any arguments */
222 
223         /* Step 5: check channel list if it exists */
224 
225         return 0;
226 }
227 
228 /*
229  * Change-Of-State (COS) 'do_cmd' operation
230  *
231  * Enable the COS interrupt as configured by apci1032_cos_insn_config().
232  */
233 static int apci1032_cos_cmd(struct comedi_device *dev,
234                             struct comedi_subdevice *s)
235 {
236         struct apci1032_private *devpriv = dev->private;
237 
238         if (!devpriv->ctrl) {
239                 dev_warn(dev->class_dev,
240                          "Interrupts disabled due to mode configuration!\n");
241                 return -EINVAL;
242         }
243 
244         outl(devpriv->mode1, dev->iobase + APCI1032_MODE1_REG);
245         outl(devpriv->mode2, dev->iobase + APCI1032_MODE2_REG);
246         outl(devpriv->ctrl, dev->iobase + APCI1032_CTRL_REG);
247 
248         return 0;
249 }
250 
251 static int apci1032_cos_cancel(struct comedi_device *dev,
252                                struct comedi_subdevice *s)
253 {
254         return apci1032_reset(dev);
255 }
256 
257 static irqreturn_t apci1032_interrupt(int irq, void *d)
258 {
259         struct comedi_device *dev = d;
260         struct apci1032_private *devpriv = dev->private;
261         struct comedi_subdevice *s = dev->read_subdev;
262         unsigned int ctrl;
263 
264         /* check interrupt is from this device */
265         if ((inl(devpriv->amcc_iobase + AMCC_OP_REG_INTCSR) &
266              INTCSR_INTR_ASSERTED) == 0)
267                 return IRQ_NONE;
268 
269         /* check interrupt is enabled */
270         ctrl = inl(dev->iobase + APCI1032_CTRL_REG);
271         if ((ctrl & APCI1032_CTRL_INT_ENA) == 0)
272                 return IRQ_HANDLED;
273 
274         /* disable the interrupt */
275         outl(ctrl & ~APCI1032_CTRL_INT_ENA, dev->iobase + APCI1032_CTRL_REG);
276 
277         s->state = inl(dev->iobase + APCI1032_STATUS_REG) & 0xffff;
278         comedi_buf_write_samples(s, &s->state, 1);
279         comedi_handle_events(dev, s);
280 
281         /* enable the interrupt */
282         outl(ctrl, dev->iobase + APCI1032_CTRL_REG);
283 
284         return IRQ_HANDLED;
285 }
286 
287 static int apci1032_di_insn_bits(struct comedi_device *dev,
288                                  struct comedi_subdevice *s,
289                                  struct comedi_insn *insn,
290                                  unsigned int *data)
291 {
292         data[1] = inl(dev->iobase + APCI1032_DI_REG);
293 
294         return insn->n;
295 }
296 
297 static int apci1032_auto_attach(struct comedi_device *dev,
298                                 unsigned long context_unused)
299 {
300         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
301         struct apci1032_private *devpriv;
302         struct comedi_subdevice *s;
303         int ret;
304 
305         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
306         if (!devpriv)
307                 return -ENOMEM;
308 
309         ret = comedi_pci_enable(dev);
310         if (ret)
311                 return ret;
312 
313         devpriv->amcc_iobase = pci_resource_start(pcidev, 0);
314         dev->iobase = pci_resource_start(pcidev, 1);
315         apci1032_reset(dev);
316         if (pcidev->irq > 0) {
317                 ret = request_irq(pcidev->irq, apci1032_interrupt, IRQF_SHARED,
318                                   dev->board_name, dev);
319                 if (ret == 0)
320                         dev->irq = pcidev->irq;
321         }
322 
323         ret = comedi_alloc_subdevices(dev, 2);
324         if (ret)
325                 return ret;
326 
327         /*  Allocate and Initialise DI Subdevice Structures */
328         s = &dev->subdevices[0];
329         s->type         = COMEDI_SUBD_DI;
330         s->subdev_flags = SDF_READABLE;
331         s->n_chan       = 32;
332         s->maxdata      = 1;
333         s->range_table  = &range_digital;
334         s->insn_bits    = apci1032_di_insn_bits;
335 
336         /* Change-Of-State (COS) interrupt subdevice */
337         s = &dev->subdevices[1];
338         if (dev->irq) {
339                 dev->read_subdev = s;
340                 s->type         = COMEDI_SUBD_DI;
341                 s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
342                 s->n_chan       = 1;
343                 s->maxdata      = 1;
344                 s->range_table  = &range_digital;
345                 s->insn_config  = apci1032_cos_insn_config;
346                 s->insn_bits    = apci1032_cos_insn_bits;
347                 s->len_chanlist = 1;
348                 s->do_cmdtest   = apci1032_cos_cmdtest;
349                 s->do_cmd       = apci1032_cos_cmd;
350                 s->cancel       = apci1032_cos_cancel;
351         } else {
352                 s->type         = COMEDI_SUBD_UNUSED;
353         }
354 
355         return 0;
356 }
357 
358 static void apci1032_detach(struct comedi_device *dev)
359 {
360         if (dev->iobase)
361                 apci1032_reset(dev);
362         comedi_pci_detach(dev);
363 }
364 
365 static struct comedi_driver apci1032_driver = {
366         .driver_name    = "addi_apci_1032",
367         .module         = THIS_MODULE,
368         .auto_attach    = apci1032_auto_attach,
369         .detach         = apci1032_detach,
370 };
371 
372 static int apci1032_pci_probe(struct pci_dev *dev,
373                               const struct pci_device_id *id)
374 {
375         return comedi_pci_auto_config(dev, &apci1032_driver, id->driver_data);
376 }
377 
378 static const struct pci_device_id apci1032_pci_table[] = {
379         { PCI_DEVICE(PCI_VENDOR_ID_ADDIDATA, 0x1003) },
380         { 0 }
381 };
382 MODULE_DEVICE_TABLE(pci, apci1032_pci_table);
383 
384 static struct pci_driver apci1032_pci_driver = {
385         .name           = "addi_apci_1032",
386         .id_table       = apci1032_pci_table,
387         .probe          = apci1032_pci_probe,
388         .remove         = comedi_pci_auto_unconfig,
389 };
390 module_comedi_pci_driver(apci1032_driver, apci1032_pci_driver);
391 
392 MODULE_AUTHOR("Comedi http://www.comedi.org");
393 MODULE_DESCRIPTION("ADDI-DATA APCI-1032, 32 channel DI boards");
394 MODULE_LICENSE("GPL");
395 

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