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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_MODE(x)       (((x) & 0x1) << 1)
 88 #define APCI1032_CTRL_INT_OR            APCI1032_CTRL_INT_MODE(0)
 89 #define APCI1032_CTRL_INT_AND           APCI1032_CTRL_INT_MODE(1)
 90 #define APCI1032_CTRL_INT_ENA           BIT(2)
 91 
 92 struct apci1032_private {
 93         unsigned long amcc_iobase;      /* base of AMCC I/O registers */
 94         unsigned int mode1;     /* rising-edge/high level channels */
 95         unsigned int mode2;     /* falling-edge/low level channels */
 96         unsigned int ctrl;      /* interrupt mode OR (edge) . AND (level) */
 97 };
 98 
 99 static int apci1032_reset(struct comedi_device *dev)
100 {
101         /* disable the interrupts */
102         outl(0x0, dev->iobase + APCI1032_CTRL_REG);
103         /* Reset the interrupt status register */
104         inl(dev->iobase + APCI1032_STATUS_REG);
105         /* Disable the and/or interrupt */
106         outl(0x0, dev->iobase + APCI1032_MODE1_REG);
107         outl(0x0, dev->iobase + APCI1032_MODE2_REG);
108 
109         return 0;
110 }
111 
112 static int apci1032_cos_insn_config(struct comedi_device *dev,
113                                     struct comedi_subdevice *s,
114                                     struct comedi_insn *insn,
115                                     unsigned int *data)
116 {
117         struct apci1032_private *devpriv = dev->private;
118         unsigned int shift, oldmask;
119 
120         switch (data[0]) {
121         case INSN_CONFIG_DIGITAL_TRIG:
122                 if (data[1] != 0)
123                         return -EINVAL;
124                 shift = data[3];
125                 oldmask = (1U << shift) - 1;
126                 switch (data[2]) {
127                 case COMEDI_DIGITAL_TRIG_DISABLE:
128                         devpriv->ctrl = 0;
129                         devpriv->mode1 = 0;
130                         devpriv->mode2 = 0;
131                         apci1032_reset(dev);
132                         break;
133                 case COMEDI_DIGITAL_TRIG_ENABLE_EDGES:
134                         if (devpriv->ctrl != (APCI1032_CTRL_INT_ENA |
135                                               APCI1032_CTRL_INT_OR)) {
136                                 /* switching to 'OR' mode */
137                                 devpriv->ctrl = APCI1032_CTRL_INT_ENA |
138                                                 APCI1032_CTRL_INT_OR;
139                                 /* wipe old channels */
140                                 devpriv->mode1 = 0;
141                                 devpriv->mode2 = 0;
142                         } else {
143                                 /* preserve unspecified channels */
144                                 devpriv->mode1 &= oldmask;
145                                 devpriv->mode2 &= oldmask;
146                         }
147                         /* configure specified channels */
148                         devpriv->mode1 |= data[4] << shift;
149                         devpriv->mode2 |= data[5] << shift;
150                         break;
151                 case COMEDI_DIGITAL_TRIG_ENABLE_LEVELS:
152                         if (devpriv->ctrl != (APCI1032_CTRL_INT_ENA |
153                                               APCI1032_CTRL_INT_AND)) {
154                                 /* switching to 'AND' mode */
155                                 devpriv->ctrl = APCI1032_CTRL_INT_ENA |
156                                                 APCI1032_CTRL_INT_AND;
157                                 /* wipe old channels */
158                                 devpriv->mode1 = 0;
159                                 devpriv->mode2 = 0;
160                         } else {
161                                 /* preserve unspecified channels */
162                                 devpriv->mode1 &= oldmask;
163                                 devpriv->mode2 &= oldmask;
164                         }
165                         /* configure specified channels */
166                         devpriv->mode1 |= data[4] << shift;
167                         devpriv->mode2 |= data[5] << shift;
168                         break;
169                 default:
170                         return -EINVAL;
171                 }
172                 break;
173         default:
174                 return -EINVAL;
175         }
176 
177         return insn->n;
178 }
179 
180 static int apci1032_cos_insn_bits(struct comedi_device *dev,
181                                   struct comedi_subdevice *s,
182                                   struct comedi_insn *insn,
183                                   unsigned int *data)
184 {
185         data[1] = s->state;
186 
187         return 0;
188 }
189 
190 static int apci1032_cos_cmdtest(struct comedi_device *dev,
191                                 struct comedi_subdevice *s,
192                                 struct comedi_cmd *cmd)
193 {
194         int err = 0;
195 
196         /* Step 1 : check if triggers are trivially valid */
197 
198         err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
199         err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
200         err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW);
201         err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
202         err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_NONE);
203 
204         if (err)
205                 return 1;
206 
207         /* Step 2a : make sure trigger sources are unique */
208         /* Step 2b : and mutually compatible */
209 
210         /* Step 3: check if arguments are trivially valid */
211 
212         err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
213         err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
214         err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
215         err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
216                                            cmd->chanlist_len);
217         err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
218 
219         if (err)
220                 return 3;
221 
222         /* Step 4: fix up any arguments */
223 
224         /* Step 5: check channel list if it exists */
225 
226         return 0;
227 }
228 
229 /*
230  * Change-Of-State (COS) 'do_cmd' operation
231  *
232  * Enable the COS interrupt as configured by apci1032_cos_insn_config().
233  */
234 static int apci1032_cos_cmd(struct comedi_device *dev,
235                             struct comedi_subdevice *s)
236 {
237         struct apci1032_private *devpriv = dev->private;
238 
239         if (!devpriv->ctrl) {
240                 dev_warn(dev->class_dev,
241                          "Interrupts disabled due to mode configuration!\n");
242                 return -EINVAL;
243         }
244 
245         outl(devpriv->mode1, dev->iobase + APCI1032_MODE1_REG);
246         outl(devpriv->mode2, dev->iobase + APCI1032_MODE2_REG);
247         outl(devpriv->ctrl, dev->iobase + APCI1032_CTRL_REG);
248 
249         return 0;
250 }
251 
252 static int apci1032_cos_cancel(struct comedi_device *dev,
253                                struct comedi_subdevice *s)
254 {
255         return apci1032_reset(dev);
256 }
257 
258 static irqreturn_t apci1032_interrupt(int irq, void *d)
259 {
260         struct comedi_device *dev = d;
261         struct apci1032_private *devpriv = dev->private;
262         struct comedi_subdevice *s = dev->read_subdev;
263         unsigned int ctrl;
264 
265         /* check interrupt is from this device */
266         if ((inl(devpriv->amcc_iobase + AMCC_OP_REG_INTCSR) &
267              INTCSR_INTR_ASSERTED) == 0)
268                 return IRQ_NONE;
269 
270         /* check interrupt is enabled */
271         ctrl = inl(dev->iobase + APCI1032_CTRL_REG);
272         if ((ctrl & APCI1032_CTRL_INT_ENA) == 0)
273                 return IRQ_HANDLED;
274 
275         /* disable the interrupt */
276         outl(ctrl & ~APCI1032_CTRL_INT_ENA, dev->iobase + APCI1032_CTRL_REG);
277 
278         s->state = inl(dev->iobase + APCI1032_STATUS_REG) & 0xffff;
279         comedi_buf_write_samples(s, &s->state, 1);
280         comedi_handle_events(dev, s);
281 
282         /* enable the interrupt */
283         outl(ctrl, dev->iobase + APCI1032_CTRL_REG);
284 
285         return IRQ_HANDLED;
286 }
287 
288 static int apci1032_di_insn_bits(struct comedi_device *dev,
289                                  struct comedi_subdevice *s,
290                                  struct comedi_insn *insn,
291                                  unsigned int *data)
292 {
293         data[1] = inl(dev->iobase + APCI1032_DI_REG);
294 
295         return insn->n;
296 }
297 
298 static int apci1032_auto_attach(struct comedi_device *dev,
299                                 unsigned long context_unused)
300 {
301         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
302         struct apci1032_private *devpriv;
303         struct comedi_subdevice *s;
304         int ret;
305 
306         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
307         if (!devpriv)
308                 return -ENOMEM;
309 
310         ret = comedi_pci_enable(dev);
311         if (ret)
312                 return ret;
313 
314         devpriv->amcc_iobase = pci_resource_start(pcidev, 0);
315         dev->iobase = pci_resource_start(pcidev, 1);
316         apci1032_reset(dev);
317         if (pcidev->irq > 0) {
318                 ret = request_irq(pcidev->irq, apci1032_interrupt, IRQF_SHARED,
319                                   dev->board_name, dev);
320                 if (ret == 0)
321                         dev->irq = pcidev->irq;
322         }
323 
324         ret = comedi_alloc_subdevices(dev, 2);
325         if (ret)
326                 return ret;
327 
328         /*  Allocate and Initialise DI Subdevice Structures */
329         s = &dev->subdevices[0];
330         s->type         = COMEDI_SUBD_DI;
331         s->subdev_flags = SDF_READABLE;
332         s->n_chan       = 32;
333         s->maxdata      = 1;
334         s->range_table  = &range_digital;
335         s->insn_bits    = apci1032_di_insn_bits;
336 
337         /* Change-Of-State (COS) interrupt subdevice */
338         s = &dev->subdevices[1];
339         if (dev->irq) {
340                 dev->read_subdev = s;
341                 s->type         = COMEDI_SUBD_DI;
342                 s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
343                 s->n_chan       = 1;
344                 s->maxdata      = 1;
345                 s->range_table  = &range_digital;
346                 s->insn_config  = apci1032_cos_insn_config;
347                 s->insn_bits    = apci1032_cos_insn_bits;
348                 s->len_chanlist = 1;
349                 s->do_cmdtest   = apci1032_cos_cmdtest;
350                 s->do_cmd       = apci1032_cos_cmd;
351                 s->cancel       = apci1032_cos_cancel;
352         } else {
353                 s->type         = COMEDI_SUBD_UNUSED;
354         }
355 
356         return 0;
357 }
358 
359 static void apci1032_detach(struct comedi_device *dev)
360 {
361         if (dev->iobase)
362                 apci1032_reset(dev);
363         comedi_pci_detach(dev);
364 }
365 
366 static struct comedi_driver apci1032_driver = {
367         .driver_name    = "addi_apci_1032",
368         .module         = THIS_MODULE,
369         .auto_attach    = apci1032_auto_attach,
370         .detach         = apci1032_detach,
371 };
372 
373 static int apci1032_pci_probe(struct pci_dev *dev,
374                               const struct pci_device_id *id)
375 {
376         return comedi_pci_auto_config(dev, &apci1032_driver, id->driver_data);
377 }
378 
379 static const struct pci_device_id apci1032_pci_table[] = {
380         { PCI_DEVICE(PCI_VENDOR_ID_ADDIDATA, 0x1003) },
381         { 0 }
382 };
383 MODULE_DEVICE_TABLE(pci, apci1032_pci_table);
384 
385 static struct pci_driver apci1032_pci_driver = {
386         .name           = "addi_apci_1032",
387         .id_table       = apci1032_pci_table,
388         .probe          = apci1032_pci_probe,
389         .remove         = comedi_pci_auto_unconfig,
390 };
391 module_comedi_pci_driver(apci1032_driver, apci1032_pci_driver);
392 
393 MODULE_AUTHOR("Comedi http://www.comedi.org");
394 MODULE_DESCRIPTION("ADDI-DATA APCI-1032, 32 channel DI boards");
395 MODULE_LICENSE("GPL");
396 

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