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Linux/drivers/staging/comedi/drivers/mf6x4.c

  1 /*
  2  *  comedi/drivers/mf6x4.c
  3  *  Driver for Humusoft MF634 and MF624 Data acquisition cards
  4  *
  5  *  COMEDI - Linux Control and Measurement Device Interface
  6  *  Copyright (C) 2000 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  * Driver: mf6x4
 20  * Description: Humusoft MF634 and MF624 Data acquisition card driver
 21  * Devices: [Humusoft] MF634 (mf634), MF624 (mf624)
 22  * Author: Rostislav Lisovy <lisovy@gmail.com>
 23  * Status: works
 24  * Updated:
 25  * Configuration Options: none
 26  */
 27 
 28 #include <linux/module.h>
 29 #include <linux/delay.h>
 30 
 31 #include "../comedi_pci.h"
 32 
 33 /* Registers present in BAR0 memory region */
 34 #define MF624_GPIOC_REG         0x54
 35 
 36 #define MF6X4_GPIOC_EOLC        BIT(17) /* End Of Last Conversion */
 37 #define MF6X4_GPIOC_LDAC        BIT(23) /* Load DACs */
 38 #define MF6X4_GPIOC_DACEN       BIT(26)
 39 
 40 /* BAR1 registers */
 41 #define MF6X4_ADDATA_REG        0x00
 42 #define MF6X4_ADCTRL_REG        0x00
 43 #define MF6X4_ADCTRL_CHAN(x)    BIT(chan)
 44 #define MF6X4_DIN_REG           0x10
 45 #define MF6X4_DIN_MASK          0xff
 46 #define MF6X4_DOUT_REG          0x10
 47 #define MF6X4_ADSTART_REG       0x20
 48 #define MF6X4_DAC_REG(x)        (0x20 + ((x) * 2))
 49 
 50 /* BAR2 registers */
 51 #define MF634_GPIOC_REG         0x68
 52 
 53 enum mf6x4_boardid {
 54         BOARD_MF634,
 55         BOARD_MF624,
 56 };
 57 
 58 struct mf6x4_board {
 59         const char *name;
 60         /* We need to keep track of the order of BARs used by the cards */
 61         unsigned int bar_nums[3];
 62 };
 63 
 64 static const struct mf6x4_board mf6x4_boards[] = {
 65         [BOARD_MF634] = {
 66                 .name           = "mf634",
 67                 .bar_nums       = {0, 2, 3},
 68         },
 69         [BOARD_MF624] = {
 70                 .name           = "mf624",
 71                 .bar_nums       = {0, 2, 4},
 72         },
 73 };
 74 
 75 struct mf6x4_private {
 76         /*
 77          * Documentation for both MF634 and MF624 describes registers
 78          * present in BAR0, 1 and 2 regions.
 79          * The real (i.e. in HW) BAR numbers are different for MF624
 80          * and MF634 yet we will call them 0, 1, 2
 81          */
 82         void __iomem *bar0_mem;
 83         void __iomem *bar2_mem;
 84 
 85         /*
 86          * This configuration register has the same function and fields
 87          * for both cards however it lies in different BARs on different
 88          * offsets -- this variable makes the access easier
 89          */
 90         void __iomem *gpioc_reg;
 91 };
 92 
 93 static int mf6x4_di_insn_bits(struct comedi_device *dev,
 94                               struct comedi_subdevice *s,
 95                               struct comedi_insn *insn,
 96                               unsigned int *data)
 97 {
 98         data[1] = ioread16(dev->mmio + MF6X4_DIN_REG) & MF6X4_DIN_MASK;
 99 
100         return insn->n;
101 }
102 
103 static int mf6x4_do_insn_bits(struct comedi_device *dev,
104                               struct comedi_subdevice *s,
105                               struct comedi_insn *insn,
106                               unsigned int *data)
107 {
108         if (comedi_dio_update_state(s, data))
109                 iowrite16(s->state, dev->mmio + MF6X4_DOUT_REG);
110 
111         data[1] = s->state;
112 
113         return insn->n;
114 }
115 
116 static int mf6x4_ai_eoc(struct comedi_device *dev,
117                         struct comedi_subdevice *s,
118                         struct comedi_insn *insn,
119                         unsigned long context)
120 {
121         struct mf6x4_private *devpriv = dev->private;
122         unsigned int status;
123 
124         status = ioread32(devpriv->gpioc_reg);
125         if (status & MF6X4_GPIOC_EOLC)
126                 return 0;
127         return -EBUSY;
128 }
129 
130 static int mf6x4_ai_insn_read(struct comedi_device *dev,
131                               struct comedi_subdevice *s,
132                               struct comedi_insn *insn,
133                               unsigned int *data)
134 {
135         unsigned int chan = CR_CHAN(insn->chanspec);
136         unsigned int d;
137         int ret;
138         int i;
139 
140         /* Set the ADC channel number in the scan list */
141         iowrite16(MF6X4_ADCTRL_CHAN(chan), dev->mmio + MF6X4_ADCTRL_REG);
142 
143         for (i = 0; i < insn->n; i++) {
144                 /* Trigger ADC conversion by reading ADSTART */
145                 ioread16(dev->mmio + MF6X4_ADSTART_REG);
146 
147                 ret = comedi_timeout(dev, s, insn, mf6x4_ai_eoc, 0);
148                 if (ret)
149                         return ret;
150 
151                 /* Read the actual value */
152                 d = ioread16(dev->mmio + MF6X4_ADDATA_REG);
153                 d &= s->maxdata;
154                 /* munge the 2's complement data to offset binary */
155                 data[i] = comedi_offset_munge(s, d);
156         }
157 
158         iowrite16(0x0, dev->mmio + MF6X4_ADCTRL_REG);
159 
160         return insn->n;
161 }
162 
163 static int mf6x4_ao_insn_write(struct comedi_device *dev,
164                                struct comedi_subdevice *s,
165                                struct comedi_insn *insn,
166                                unsigned int *data)
167 {
168         struct mf6x4_private *devpriv = dev->private;
169         unsigned int chan = CR_CHAN(insn->chanspec);
170         unsigned int val = s->readback[chan];
171         unsigned int gpioc;
172         int i;
173 
174         /* Enable instantaneous update of converters outputs + Enable DACs */
175         gpioc = ioread32(devpriv->gpioc_reg);
176         iowrite32((gpioc & ~MF6X4_GPIOC_LDAC) | MF6X4_GPIOC_DACEN,
177                   devpriv->gpioc_reg);
178 
179         for (i = 0; i < insn->n; i++) {
180                 val = data[i];
181                 iowrite16(val, dev->mmio + MF6X4_DAC_REG(chan));
182         }
183         s->readback[chan] = val;
184 
185         return insn->n;
186 }
187 
188 static int mf6x4_auto_attach(struct comedi_device *dev, unsigned long context)
189 {
190         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
191         const struct mf6x4_board *board = NULL;
192         struct mf6x4_private *devpriv;
193         struct comedi_subdevice *s;
194         int ret;
195 
196         if (context < ARRAY_SIZE(mf6x4_boards))
197                 board = &mf6x4_boards[context];
198         else
199                 return -ENODEV;
200 
201         dev->board_ptr = board;
202         dev->board_name = board->name;
203 
204         ret = comedi_pci_enable(dev);
205         if (ret)
206                 return ret;
207 
208         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
209         if (!devpriv)
210                 return -ENOMEM;
211 
212         devpriv->bar0_mem = pci_ioremap_bar(pcidev, board->bar_nums[0]);
213         if (!devpriv->bar0_mem)
214                 return -ENODEV;
215 
216         dev->mmio = pci_ioremap_bar(pcidev, board->bar_nums[1]);
217         if (!dev->mmio)
218                 return -ENODEV;
219 
220         devpriv->bar2_mem = pci_ioremap_bar(pcidev, board->bar_nums[2]);
221         if (!devpriv->bar2_mem)
222                 return -ENODEV;
223 
224         if (board == &mf6x4_boards[BOARD_MF634])
225                 devpriv->gpioc_reg = devpriv->bar2_mem + MF634_GPIOC_REG;
226         else
227                 devpriv->gpioc_reg = devpriv->bar0_mem + MF624_GPIOC_REG;
228 
229         ret = comedi_alloc_subdevices(dev, 4);
230         if (ret)
231                 return ret;
232 
233         /* Analog Input subdevice */
234         s = &dev->subdevices[0];
235         s->type         = COMEDI_SUBD_AI;
236         s->subdev_flags = SDF_READABLE | SDF_GROUND;
237         s->n_chan       = 8;
238         s->maxdata      = 0x3fff;
239         s->range_table  = &range_bipolar10;
240         s->insn_read    = mf6x4_ai_insn_read;
241 
242         /* Analog Output subdevice */
243         s = &dev->subdevices[1];
244         s->type         = COMEDI_SUBD_AO;
245         s->subdev_flags = SDF_WRITABLE;
246         s->n_chan       = 8;
247         s->maxdata      = 0x3fff;
248         s->range_table  = &range_bipolar10;
249         s->insn_write   = mf6x4_ao_insn_write;
250 
251         ret = comedi_alloc_subdev_readback(s);
252         if (ret)
253                 return ret;
254 
255         /* Digital Input subdevice */
256         s = &dev->subdevices[2];
257         s->type         = COMEDI_SUBD_DI;
258         s->subdev_flags = SDF_READABLE;
259         s->n_chan       = 8;
260         s->maxdata      = 1;
261         s->range_table  = &range_digital;
262         s->insn_bits    = mf6x4_di_insn_bits;
263 
264         /* Digital Output subdevice */
265         s = &dev->subdevices[3];
266         s->type         = COMEDI_SUBD_DO;
267         s->subdev_flags = SDF_WRITABLE;
268         s->n_chan       = 8;
269         s->maxdata      = 1;
270         s->range_table  = &range_digital;
271         s->insn_bits    = mf6x4_do_insn_bits;
272 
273         return 0;
274 }
275 
276 static void mf6x4_detach(struct comedi_device *dev)
277 {
278         struct mf6x4_private *devpriv = dev->private;
279 
280         if (devpriv) {
281                 if (devpriv->bar0_mem)
282                         iounmap(devpriv->bar0_mem);
283                 if (devpriv->bar2_mem)
284                         iounmap(devpriv->bar2_mem);
285         }
286         comedi_pci_detach(dev);
287 }
288 
289 static struct comedi_driver mf6x4_driver = {
290         .driver_name    = "mf6x4",
291         .module         = THIS_MODULE,
292         .auto_attach    = mf6x4_auto_attach,
293         .detach         = mf6x4_detach,
294 };
295 
296 static int mf6x4_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
297 {
298         return comedi_pci_auto_config(dev, &mf6x4_driver, id->driver_data);
299 }
300 
301 static const struct pci_device_id mf6x4_pci_table[] = {
302         { PCI_VDEVICE(HUMUSOFT, 0x0634), BOARD_MF634 },
303         { PCI_VDEVICE(HUMUSOFT, 0x0624), BOARD_MF624 },
304         { 0 }
305 };
306 MODULE_DEVICE_TABLE(pci, mf6x4_pci_table);
307 
308 static struct pci_driver mf6x4_pci_driver = {
309         .name           = "mf6x4",
310         .id_table       = mf6x4_pci_table,
311         .probe          = mf6x4_pci_probe,
312         .remove         = comedi_pci_auto_unconfig,
313 };
314 
315 module_comedi_pci_driver(mf6x4_driver, mf6x4_pci_driver);
316 
317 MODULE_AUTHOR("Rostislav Lisovy <lisovy@gmail.com>");
318 MODULE_DESCRIPTION("Comedi MF634 and MF624 DAQ cards driver");
319 MODULE_LICENSE("GPL");
320 

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