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Linux/drivers/staging/comedi/drivers/icp_multi.c

  1 /*
  2  * icp_multi.c
  3  * Comedi driver for Inova ICP_MULTI board
  4  *
  5  * COMEDI - Linux Control and Measurement Device Interface
  6  * Copyright (C) 1997-2002 David A. Schleef <ds@schleef.org>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  */
 18 
 19 /*
 20  * Driver: icp_multi
 21  * Description: Inova ICP_MULTI
 22  * Devices: [Inova] ICP_MULTI (icp_multi)
 23  * Author: Anne Smorthit <anne.smorthit@sfwte.ch>
 24  * Status: works
 25  *
 26  * Configuration options: not applicable, uses PCI auto config
 27  *
 28  * The driver works for analog input and output and digital input and
 29  * output. It does not work with interrupts or with the counters. Currently
 30  * no support for DMA.
 31  *
 32  * It has 16 single-ended or 8 differential Analogue Input channels with
 33  * 12-bit resolution.  Ranges : 5V, 10V, +/-5V, +/-10V, 0..20mA and 4..20mA.
 34  * Input ranges can be individually programmed for each channel.  Voltage or
 35  * current measurement is selected by jumper.
 36  *
 37  * There are 4 x 12-bit Analogue Outputs.  Ranges : 5V, 10V, +/-5V, +/-10V
 38  *
 39  * 16 x Digital Inputs, 24V
 40  *
 41  * 8 x Digital Outputs, 24V, 1A
 42  *
 43  * 4 x 16-bit counters - not implemented
 44  */
 45 
 46 #include <linux/module.h>
 47 #include <linux/delay.h>
 48 
 49 #include "../comedi_pci.h"
 50 
 51 #define ICP_MULTI_ADC_CSR       0x00    /* R/W: ADC command/status register */
 52 #define ICP_MULTI_ADC_CSR_ST    BIT(0)  /* Start ADC */
 53 #define ICP_MULTI_ADC_CSR_BSY   BIT(0)  /* ADC busy */
 54 #define ICP_MULTI_ADC_CSR_BI    BIT(4)  /* Bipolar input range */
 55 #define ICP_MULTI_ADC_CSR_RA    BIT(5)  /* Input range 0 = 5V, 1 = 10V */
 56 #define ICP_MULTI_ADC_CSR_DI    BIT(6)  /* Input mode 1 = differential */
 57 #define ICP_MULTI_ADC_CSR_DI_CHAN(x) (((x) & 0x7) << 9)
 58 #define ICP_MULTI_ADC_CSR_SE_CHAN(x) (((x) & 0xf) << 8)
 59 #define ICP_MULTI_AI            2       /* R:   Analogue input data */
 60 #define ICP_MULTI_DAC_CSR       0x04    /* R/W: DAC command/status register */
 61 #define ICP_MULTI_DAC_CSR_ST    BIT(0)  /* Start DAC */
 62 #define ICP_MULTI_DAC_CSR_BSY   BIT(0)  /* DAC busy */
 63 #define ICP_MULTI_DAC_CSR_BI    BIT(4)  /* Bipolar output range */
 64 #define ICP_MULTI_DAC_CSR_RA    BIT(5)  /* Output range 0 = 5V, 1 = 10V */
 65 #define ICP_MULTI_DAC_CSR_CHAN(x) (((x) & 0x3) << 8)
 66 #define ICP_MULTI_AO            6       /* R/W: Analogue output data */
 67 #define ICP_MULTI_DI            8       /* R/W: Digital inputs */
 68 #define ICP_MULTI_DO            0x0A    /* R/W: Digital outputs */
 69 #define ICP_MULTI_INT_EN        0x0c    /* R/W: Interrupt enable register */
 70 #define ICP_MULTI_INT_STAT      0x0e    /* R/W: Interrupt status register */
 71 #define ICP_MULTI_INT_ADC_RDY   BIT(0)  /* A/D conversion ready interrupt */
 72 #define ICP_MULTI_INT_DAC_RDY   BIT(1)  /* D/A conversion ready interrupt */
 73 #define ICP_MULTI_INT_DOUT_ERR  BIT(2)  /* Digital output error interrupt */
 74 #define ICP_MULTI_INT_DIN_STAT  BIT(3)  /* Digital input status change int. */
 75 #define ICP_MULTI_INT_CIE0      BIT(4)  /* Counter 0 overrun interrupt */
 76 #define ICP_MULTI_INT_CIE1      BIT(5)  /* Counter 1 overrun interrupt */
 77 #define ICP_MULTI_INT_CIE2      BIT(6)  /* Counter 2 overrun interrupt */
 78 #define ICP_MULTI_INT_CIE3      BIT(7)  /* Counter 3 overrun interrupt */
 79 #define ICP_MULTI_INT_MASK      0xff    /* All interrupts */
 80 #define ICP_MULTI_CNTR0         0x10    /* R/W: Counter 0 */
 81 #define ICP_MULTI_CNTR1         0x12    /* R/W: counter 1 */
 82 #define ICP_MULTI_CNTR2         0x14    /* R/W: Counter 2 */
 83 #define ICP_MULTI_CNTR3         0x16    /* R/W: Counter 3 */
 84 
 85 /* analog input and output have the same range options */
 86 static const struct comedi_lrange icp_multi_ranges = {
 87         4, {
 88                 UNI_RANGE(5),
 89                 UNI_RANGE(10),
 90                 BIP_RANGE(5),
 91                 BIP_RANGE(10)
 92         }
 93 };
 94 
 95 static const char range_codes_analog[] = { 0x00, 0x20, 0x10, 0x30 };
 96 
 97 static int icp_multi_ai_eoc(struct comedi_device *dev,
 98                             struct comedi_subdevice *s,
 99                             struct comedi_insn *insn,
100                             unsigned long context)
101 {
102         unsigned int status;
103 
104         status = readw(dev->mmio + ICP_MULTI_ADC_CSR);
105         if ((status & ICP_MULTI_ADC_CSR_BSY) == 0)
106                 return 0;
107         return -EBUSY;
108 }
109 
110 static int icp_multi_ai_insn_read(struct comedi_device *dev,
111                                   struct comedi_subdevice *s,
112                                   struct comedi_insn *insn,
113                                   unsigned int *data)
114 {
115         unsigned int chan = CR_CHAN(insn->chanspec);
116         unsigned int range = CR_RANGE(insn->chanspec);
117         unsigned int aref = CR_AREF(insn->chanspec);
118         unsigned int adc_csr;
119         int ret = 0;
120         int n;
121 
122         /* Set mode and range data for specified channel */
123         if (aref == AREF_DIFF) {
124                 adc_csr = ICP_MULTI_ADC_CSR_DI_CHAN(chan) |
125                           ICP_MULTI_ADC_CSR_DI;
126         } else {
127                 adc_csr = ICP_MULTI_ADC_CSR_SE_CHAN(chan);
128         }
129         adc_csr |= range_codes_analog[range];
130         writew(adc_csr, dev->mmio + ICP_MULTI_ADC_CSR);
131 
132         for (n = 0; n < insn->n; n++) {
133                 /*  Set start ADC bit */
134                 writew(adc_csr | ICP_MULTI_ADC_CSR_ST,
135                        dev->mmio + ICP_MULTI_ADC_CSR);
136 
137                 udelay(1);
138 
139                 /*  Wait for conversion to complete, or get fed up waiting */
140                 ret = comedi_timeout(dev, s, insn, icp_multi_ai_eoc, 0);
141                 if (ret)
142                         break;
143 
144                 data[n] = (readw(dev->mmio + ICP_MULTI_AI) >> 4) & 0x0fff;
145         }
146 
147         return ret ? ret : n;
148 }
149 
150 static int icp_multi_ao_ready(struct comedi_device *dev,
151                               struct comedi_subdevice *s,
152                               struct comedi_insn *insn,
153                               unsigned long context)
154 {
155         unsigned int status;
156 
157         status = readw(dev->mmio + ICP_MULTI_DAC_CSR);
158         if ((status & ICP_MULTI_DAC_CSR_BSY) == 0)
159                 return 0;
160         return -EBUSY;
161 }
162 
163 static int icp_multi_ao_insn_write(struct comedi_device *dev,
164                                    struct comedi_subdevice *s,
165                                    struct comedi_insn *insn,
166                                    unsigned int *data)
167 {
168         unsigned int chan = CR_CHAN(insn->chanspec);
169         unsigned int range = CR_RANGE(insn->chanspec);
170         unsigned int dac_csr;
171         int i;
172 
173         /* Select channel and range */
174         dac_csr = ICP_MULTI_DAC_CSR_CHAN(chan);
175         dac_csr |= range_codes_analog[range];
176         writew(dac_csr, dev->mmio + ICP_MULTI_DAC_CSR);
177 
178         for (i = 0; i < insn->n; i++) {
179                 unsigned int val = data[i];
180                 int ret;
181 
182                 /* Wait for analog output to be ready for new data */
183                 ret = comedi_timeout(dev, s, insn, icp_multi_ao_ready, 0);
184                 if (ret)
185                         return ret;
186 
187                 writew(val, dev->mmio + ICP_MULTI_AO);
188 
189                 /* Set start conversion bit to write data to channel */
190                 writew(dac_csr | ICP_MULTI_DAC_CSR_ST,
191                        dev->mmio + ICP_MULTI_DAC_CSR);
192 
193                 s->readback[chan] = val;
194         }
195 
196         return insn->n;
197 }
198 
199 static int icp_multi_di_insn_bits(struct comedi_device *dev,
200                                   struct comedi_subdevice *s,
201                                   struct comedi_insn *insn,
202                                   unsigned int *data)
203 {
204         data[1] = readw(dev->mmio + ICP_MULTI_DI);
205 
206         return insn->n;
207 }
208 
209 static int icp_multi_do_insn_bits(struct comedi_device *dev,
210                                   struct comedi_subdevice *s,
211                                   struct comedi_insn *insn,
212                                   unsigned int *data)
213 {
214         if (comedi_dio_update_state(s, data))
215                 writew(s->state, dev->mmio + ICP_MULTI_DO);
216 
217         data[1] = s->state;
218 
219         return insn->n;
220 }
221 
222 static int icp_multi_reset(struct comedi_device *dev)
223 {
224         int i;
225 
226         /* Disable all interrupts and clear any requests */
227         writew(0, dev->mmio + ICP_MULTI_INT_EN);
228         writew(ICP_MULTI_INT_MASK, dev->mmio + ICP_MULTI_INT_STAT);
229 
230         /* Reset the analog output channels to 0V */
231         for (i = 0; i < 4; i++) {
232                 unsigned int dac_csr = ICP_MULTI_DAC_CSR_CHAN(i);
233 
234                 /* Select channel and 0..5V range */
235                 writew(dac_csr, dev->mmio + ICP_MULTI_DAC_CSR);
236 
237                 /* Output 0V */
238                 writew(0, dev->mmio + ICP_MULTI_AO);
239 
240                 /* Set start conversion bit to write data to channel */
241                 writew(dac_csr | ICP_MULTI_DAC_CSR_ST,
242                        dev->mmio + ICP_MULTI_DAC_CSR);
243                 udelay(1);
244         }
245 
246         /* Digital outputs to 0 */
247         writew(0, dev->mmio + ICP_MULTI_DO);
248 
249         return 0;
250 }
251 
252 static int icp_multi_auto_attach(struct comedi_device *dev,
253                                  unsigned long context_unused)
254 {
255         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
256         struct comedi_subdevice *s;
257         int ret;
258 
259         ret = comedi_pci_enable(dev);
260         if (ret)
261                 return ret;
262 
263         dev->mmio = pci_ioremap_bar(pcidev, 2);
264         if (!dev->mmio)
265                 return -ENOMEM;
266 
267         ret = comedi_alloc_subdevices(dev, 4);
268         if (ret)
269                 return ret;
270 
271         icp_multi_reset(dev);
272 
273         /* Analog Input subdevice */
274         s = &dev->subdevices[0];
275         s->type         = COMEDI_SUBD_AI;
276         s->subdev_flags = SDF_READABLE | SDF_COMMON | SDF_GROUND | SDF_DIFF;
277         s->n_chan       = 16;
278         s->maxdata      = 0x0fff;
279         s->range_table  = &icp_multi_ranges;
280         s->insn_read    = icp_multi_ai_insn_read;
281 
282         /* Analog Output subdevice */
283         s = &dev->subdevices[1];
284         s->type         = COMEDI_SUBD_AO;
285         s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_COMMON;
286         s->n_chan       = 4;
287         s->maxdata      = 0x0fff;
288         s->range_table  = &icp_multi_ranges;
289         s->insn_write   = icp_multi_ao_insn_write;
290 
291         ret = comedi_alloc_subdev_readback(s);
292         if (ret)
293                 return ret;
294 
295         /* Digital Input subdevice */
296         s = &dev->subdevices[2];
297         s->type         = COMEDI_SUBD_DI;
298         s->subdev_flags = SDF_READABLE;
299         s->n_chan       = 16;
300         s->maxdata      = 1;
301         s->range_table  = &range_digital;
302         s->insn_bits    = icp_multi_di_insn_bits;
303 
304         /* Digital Output subdevice */
305         s = &dev->subdevices[3];
306         s->type         = COMEDI_SUBD_DO;
307         s->subdev_flags = SDF_WRITABLE;
308         s->n_chan       = 8;
309         s->maxdata      = 1;
310         s->range_table  = &range_digital;
311         s->insn_bits    = icp_multi_do_insn_bits;
312 
313         return 0;
314 }
315 
316 static struct comedi_driver icp_multi_driver = {
317         .driver_name    = "icp_multi",
318         .module         = THIS_MODULE,
319         .auto_attach    = icp_multi_auto_attach,
320         .detach         = comedi_pci_detach,
321 };
322 
323 static int icp_multi_pci_probe(struct pci_dev *dev,
324                                const struct pci_device_id *id)
325 {
326         return comedi_pci_auto_config(dev, &icp_multi_driver, id->driver_data);
327 }
328 
329 static const struct pci_device_id icp_multi_pci_table[] = {
330         { PCI_DEVICE(PCI_VENDOR_ID_ICP, 0x8000) },
331         { 0 }
332 };
333 MODULE_DEVICE_TABLE(pci, icp_multi_pci_table);
334 
335 static struct pci_driver icp_multi_pci_driver = {
336         .name           = "icp_multi",
337         .id_table       = icp_multi_pci_table,
338         .probe          = icp_multi_pci_probe,
339         .remove         = comedi_pci_auto_unconfig,
340 };
341 module_comedi_pci_driver(icp_multi_driver, icp_multi_pci_driver);
342 
343 MODULE_AUTHOR("Comedi http://www.comedi.org");
344 MODULE_DESCRIPTION("Comedi driver for Inova ICP_MULTI board");
345 MODULE_LICENSE("GPL");
346 

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