2 comedi/drivers/ni_labpc.c
3 Driver for National Instruments Lab-PC series boards and compatibles
4 Copyright (C) 2001, 2002, 2003 Frank Mori Hess <fmhess@users.sourceforge.net>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 ************************************************************************
24 Description: National Instruments Lab-PC (& compatibles)
25 Author: Frank Mori Hess <fmhess@users.sourceforge.net>
26 Devices: [National Instruments] Lab-PC-1200 (labpc-1200),
27 Lab-PC-1200AI (labpc-1200ai), Lab-PC+ (lab-pc+), PCI-1200 (ni_labpc)
30 Tested with lab-pc-1200. For the older Lab-PC+, not all input ranges
31 and analog references will work, the available ranges/arefs will
32 depend on how you have configured the jumpers on your board
33 (see your owner's manual).
35 Kernel-level ISA plug-and-play support for the lab-pc-1200
37 yet been added to the driver, mainly due to the fact that
38 I don't know the device id numbers. If you have one
40 please file a bug report at http://comedi.org/
41 so I can get the necessary information from you.
43 The 1200 series boards have onboard calibration dacs for correcting
44 analog input/output offsets and gains. The proper settings for these
45 caldacs are stored on the board's eeprom. To read the caldac values
46 from the eeprom and store them into a file that can be then be used by
47 comedilib, use the comedi_calibrate program.
49 Configuration options - ISA boards:
50 [0] - I/O port base address
51 [1] - IRQ (optional, required for timed or externally triggered conversions)
52 [2] - DMA channel (optional)
54 Configuration options - PCI boards:
58 The Lab-pc+ has quirky chanlist requirements
59 when scanning multiple channels. Multiple channel scan
60 sequence must start at highest channel, then decrement down to
61 channel 0. The rest of the cards can scan down like lab-pc+ or scan
62 up from channel zero. Chanlists consisting of all one channel
63 are also legal, and allow you to pace conversions in bursts.
70 341309a (labpc-1200 register manual)
76 #include <linux/pci.h>
77 #include <linux/interrupt.h>
78 #include <linux/slab.h>
80 #include <linux/delay.h>
82 #include "../comedidev.h"
89 #include "comedi_fc.h"
92 #define DRV_NAME "ni_labpc"
94 /* size of io region used by board */
96 /* 2 MHz master clock */
97 #define LABPC_TIMER_BASE 500
99 /* Registers for the lab-pc+ */
101 /* write-only registers */
102 #define COMMAND1_REG 0x0
103 #define ADC_GAIN_MASK (0x7 << 4)
104 #define ADC_CHAN_BITS(x) ((x) & 0x7)
105 /* enables multi channel scans */
106 #define ADC_SCAN_EN_BIT 0x80
107 #define COMMAND2_REG 0x1
108 /* enable pretriggering (used in conjunction with SWTRIG) */
109 #define PRETRIG_BIT 0x1
110 /* enable paced conversions on external trigger */
111 #define HWTRIG_BIT 0x2
112 /* enable paced conversions */
113 #define SWTRIG_BIT 0x4
114 /* use two cascaded counters for pacing */
115 #define CASCADE_BIT 0x8
116 #define DAC_PACED_BIT(channel) (0x40 << ((channel) & 0x1))
117 #define COMMAND3_REG 0x2
118 /* enable dma transfers */
119 #define DMA_EN_BIT 0x1
120 /* enable interrupts for 8255 */
121 #define DIO_INTR_EN_BIT 0x2
122 /* enable dma terminal count interrupt */
123 #define DMATC_INTR_EN_BIT 0x4
124 /* enable timer interrupt */
125 #define TIMER_INTR_EN_BIT 0x8
126 /* enable error interrupt */
127 #define ERR_INTR_EN_BIT 0x10
128 /* enable fifo not empty interrupt */
129 #define ADC_FNE_INTR_EN_BIT 0x20
130 #define ADC_CONVERT_REG 0x3
131 #define DAC_LSB_REG(channel) (0x4 + 2 * ((channel) & 0x1))
132 #define DAC_MSB_REG(channel) (0x5 + 2 * ((channel) & 0x1))
133 #define ADC_CLEAR_REG 0x8
134 #define DMATC_CLEAR_REG 0xa
135 #define TIMER_CLEAR_REG 0xc
136 /* 1200 boards only */
137 #define COMMAND6_REG 0xe
138 /* select ground or common-mode reference */
139 #define ADC_COMMON_BIT 0x1
141 #define ADC_UNIP_BIT 0x2
143 #define DAC_UNIP_BIT(channel) (0x4 << ((channel) & 0x1))
144 /* enable fifo half full interrupt */
145 #define ADC_FHF_INTR_EN_BIT 0x20
146 /* enable interrupt on end of hardware count */
147 #define A1_INTR_EN_BIT 0x40
148 /* scan up from channel zero instead of down to zero */
149 #define ADC_SCAN_UP_BIT 0x80
150 #define COMMAND4_REG 0xf
151 /* enables 'interval' scanning */
152 #define INTERVAL_SCAN_EN_BIT 0x1
153 /* enables external signal on counter b1 output to trigger scan */
154 #define EXT_SCAN_EN_BIT 0x2
155 /* chooses direction (output or input) for EXTCONV* line */
156 #define EXT_CONVERT_OUT_BIT 0x4
157 /* chooses differential inputs for adc (in conjunction with board jumper) */
158 #define ADC_DIFF_BIT 0x8
159 #define EXT_CONVERT_DISABLE_BIT 0x10
160 /* 1200 boards only, calibration stuff */
161 #define COMMAND5_REG 0x1c
162 /* enable eeprom for write */
163 #define EEPROM_WRITE_UNPROTECT_BIT 0x4
164 /* enable dithering */
165 #define DITHER_EN_BIT 0x8
166 /* load calibration dac */
167 #define CALDAC_LOAD_BIT 0x10
168 /* serial clock - rising edge writes, falling edge reads */
169 #define SCLOCK_BIT 0x20
170 /* serial data bit for writing to eeprom or calibration dacs */
171 #define SDATA_BIT 0x40
172 /* enable eeprom for read/write */
173 #define EEPROM_EN_BIT 0x80
174 #define INTERVAL_COUNT_REG 0x1e
175 #define INTERVAL_LOAD_REG 0x1f
176 #define INTERVAL_LOAD_BITS 0x1
178 /* read-only registers */
179 #define STATUS1_REG 0x0
180 /* data is available in fifo */
181 #define DATA_AVAIL_BIT 0x1
182 /* overrun has occurred */
183 #define OVERRUN_BIT 0x2
185 #define OVERFLOW_BIT 0x4
186 /* timer interrupt has occurred */
187 #define TIMER_BIT 0x8
188 /* dma terminal count has occurred */
189 #define DMATC_BIT 0x10
190 /* external trigger has occurred */
191 #define EXT_TRIG_BIT 0x40
192 /* 1200 boards only */
193 #define STATUS2_REG 0x1d
194 /* programmable eeprom serial output */
195 #define EEPROM_OUT_BIT 0x1
196 /* counter A1 terminal count */
197 #define A1_TC_BIT 0x2
198 /* fifo not half full */
200 #define ADC_FIFO_REG 0xa
202 #define DIO_BASE_REG 0x10
203 #define COUNTER_A_BASE_REG 0x14
204 #define COUNTER_A_CONTROL_REG (COUNTER_A_BASE_REG + 0x3)
205 /* check modes put conversion pacer output in harmless state (a0 mode 2) */
206 #define INIT_A0_BITS 0x14
207 /* put hardware conversion counter output in harmless state (a1 mode 0) */
208 #define INIT_A1_BITS 0x70
209 #define COUNTER_B_BASE_REG 0x18
213 MODE_SINGLE_CHAN_INTERVAL,
218 static int labpc_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
219 static irqreturn_t labpc_interrupt(int irq, void *d);
220 static int labpc_drain_fifo(struct comedi_device *dev);
221 #ifdef CONFIG_ISA_DMA_API
222 static void labpc_drain_dma(struct comedi_device *dev);
223 static void handle_isa_dma(struct comedi_device *dev);
225 static void labpc_drain_dregs(struct comedi_device *dev);
226 static int labpc_ai_cmdtest(struct comedi_device *dev,
227 struct comedi_subdevice *s, struct comedi_cmd *cmd);
228 static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s);
229 static int labpc_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
230 struct comedi_insn *insn, unsigned int *data);
231 static int labpc_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
232 struct comedi_insn *insn, unsigned int *data);
233 static int labpc_ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
234 struct comedi_insn *insn, unsigned int *data);
235 static int labpc_calib_read_insn(struct comedi_device *dev,
236 struct comedi_subdevice *s,
237 struct comedi_insn *insn, unsigned int *data);
238 static int labpc_calib_write_insn(struct comedi_device *dev,
239 struct comedi_subdevice *s,
240 struct comedi_insn *insn, unsigned int *data);
241 static int labpc_eeprom_read_insn(struct comedi_device *dev,
242 struct comedi_subdevice *s,
243 struct comedi_insn *insn, unsigned int *data);
244 static int labpc_eeprom_write_insn(struct comedi_device *dev,
245 struct comedi_subdevice *s,
246 struct comedi_insn *insn,
248 static void labpc_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd,
249 enum scan_mode scan_mode);
250 #ifdef CONFIG_ISA_DMA_API
251 static unsigned int labpc_suggest_transfer_size(const struct comedi_cmd *cmd);
253 static int labpc_dio_mem_callback(int dir, int port, int data,
255 static void labpc_serial_out(struct comedi_device *dev, unsigned int value,
256 unsigned int num_bits);
257 static unsigned int labpc_serial_in(struct comedi_device *dev);
258 static unsigned int labpc_eeprom_read(struct comedi_device *dev,
259 unsigned int address);
260 static unsigned int labpc_eeprom_read_status(struct comedi_device *dev);
261 static int labpc_eeprom_write(struct comedi_device *dev,
262 unsigned int address,
264 static void write_caldac(struct comedi_device *dev, unsigned int channel,
267 /* analog input ranges */
268 #define NUM_LABPC_PLUS_AI_RANGES 16
269 /* indicates unipolar ranges */
270 static const int labpc_plus_is_unipolar[NUM_LABPC_PLUS_AI_RANGES] = {
289 /* map range index to gain bits */
290 static const int labpc_plus_ai_gain_bits[NUM_LABPC_PLUS_AI_RANGES] = {
309 static const struct comedi_lrange range_labpc_plus_ai = {
310 NUM_LABPC_PLUS_AI_RANGES,
331 #define NUM_LABPC_1200_AI_RANGES 14
332 /* indicates unipolar ranges */
333 const int labpc_1200_is_unipolar[NUM_LABPC_1200_AI_RANGES] = {
349 EXPORT_SYMBOL_GPL(labpc_1200_is_unipolar);
351 /* map range index to gain bits */
352 const int labpc_1200_ai_gain_bits[NUM_LABPC_1200_AI_RANGES] = {
368 EXPORT_SYMBOL_GPL(labpc_1200_ai_gain_bits);
370 const struct comedi_lrange range_labpc_1200_ai = {
371 NUM_LABPC_1200_AI_RANGES,
389 EXPORT_SYMBOL_GPL(range_labpc_1200_ai);
391 /* analog output ranges */
392 #define AO_RANGE_IS_UNIPOLAR 0x1
393 static const struct comedi_lrange range_labpc_ao = {
401 /* functions that do inb/outb and readb/writeb so we can use
402 * function pointers to decide which to use */
403 static inline unsigned int labpc_inb(unsigned long address)
408 static inline void labpc_outb(unsigned int byte, unsigned long address)
413 static inline unsigned int labpc_readb(unsigned long address)
415 return readb((void __iomem *)address);
418 static inline void labpc_writeb(unsigned int byte, unsigned long address)
420 writeb(byte, (void __iomem *)address);
423 static const struct labpc_board_struct labpc_boards[] = {
425 .name = "lab-pc-1200",
427 .bustype = isa_bustype,
428 .register_layout = labpc_1200_layout,
430 .ai_range_table = &range_labpc_1200_ai,
431 .ai_range_code = labpc_1200_ai_gain_bits,
432 .ai_range_is_unipolar = labpc_1200_is_unipolar,
434 .memory_mapped_io = 0,
437 .name = "lab-pc-1200ai",
439 .bustype = isa_bustype,
440 .register_layout = labpc_1200_layout,
442 .ai_range_table = &range_labpc_1200_ai,
443 .ai_range_code = labpc_1200_ai_gain_bits,
444 .ai_range_is_unipolar = labpc_1200_is_unipolar,
446 .memory_mapped_io = 0,
451 .bustype = isa_bustype,
452 .register_layout = labpc_plus_layout,
454 .ai_range_table = &range_labpc_plus_ai,
455 .ai_range_code = labpc_plus_ai_gain_bits,
456 .ai_range_is_unipolar = labpc_plus_is_unipolar,
458 .memory_mapped_io = 0,
460 #ifdef CONFIG_COMEDI_PCI_DRIVERS
465 .bustype = pci_bustype,
466 .register_layout = labpc_1200_layout,
468 .ai_range_table = &range_labpc_1200_ai,
469 .ai_range_code = labpc_1200_ai_gain_bits,
470 .ai_range_is_unipolar = labpc_1200_is_unipolar,
472 .memory_mapped_io = 1,
474 /* dummy entry so pci board works when comedi_config is passed driver name */
477 .bustype = pci_bustype,
483 * Useful for shorthand access to the particular board structure
485 #define thisboard ((struct labpc_board_struct *)dev->board_ptr)
487 /* size in bytes of dma buffer */
488 static const int dma_buffer_size = 0xff00;
489 /* 2 bytes per sample */
490 static const int sample_size = 2;
492 static inline int labpc_counter_load(struct comedi_device *dev,
493 unsigned long base_address,
494 unsigned int counter_number,
495 unsigned int count, unsigned int mode)
497 if (thisboard->memory_mapped_io)
498 return i8254_mm_load((void __iomem *)base_address, 0,
499 counter_number, count, mode);
501 return i8254_load(base_address, 0, counter_number, count, mode);
504 int labpc_common_attach(struct comedi_device *dev, unsigned long iobase,
505 unsigned int irq, unsigned int dma_chan)
507 struct labpc_private *devpriv = dev->private;
508 struct comedi_subdevice *s;
510 unsigned long isr_flags;
511 #ifdef CONFIG_ISA_DMA_API
512 unsigned long dma_flags;
517 dev_info(dev->class_dev, "ni_labpc: %s\n", thisboard->name);
519 dev_err(dev->class_dev, "io base address is zero!\n");
522 /* request io regions for isa boards */
523 if (thisboard->bustype == isa_bustype) {
524 /* check if io addresses are available */
525 if (!request_region(iobase, LABPC_SIZE, DRV_NAME)) {
526 dev_err(dev->class_dev, "I/O port conflict\n");
530 dev->iobase = iobase;
532 if (thisboard->memory_mapped_io) {
533 devpriv->read_byte = labpc_readb;
534 devpriv->write_byte = labpc_writeb;
536 devpriv->read_byte = labpc_inb;
537 devpriv->write_byte = labpc_outb;
539 /* initialize board's command registers */
540 devpriv->write_byte(devpriv->command1_bits, dev->iobase + COMMAND1_REG);
541 devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
542 devpriv->write_byte(devpriv->command3_bits, dev->iobase + COMMAND3_REG);
543 devpriv->write_byte(devpriv->command4_bits, dev->iobase + COMMAND4_REG);
544 if (thisboard->register_layout == labpc_1200_layout) {
545 devpriv->write_byte(devpriv->command5_bits,
546 dev->iobase + COMMAND5_REG);
547 devpriv->write_byte(devpriv->command6_bits,
548 dev->iobase + COMMAND6_REG);
554 if (thisboard->bustype == pci_bustype
555 || thisboard->bustype == pcmcia_bustype)
556 isr_flags |= IRQF_SHARED;
557 if (request_irq(irq, labpc_interrupt, isr_flags,
559 dev_err(dev->class_dev, "unable to allocate irq %u\n",
566 #ifdef CONFIG_ISA_DMA_API
567 /* grab dma channel */
569 dev_err(dev->class_dev, "invalid dma channel %u\n", dma_chan);
571 } else if (dma_chan) {
572 /* allocate dma buffer */
573 devpriv->dma_buffer = kmalloc(dma_buffer_size,
574 GFP_KERNEL | GFP_DMA);
575 if (devpriv->dma_buffer == NULL)
578 if (request_dma(dma_chan, DRV_NAME)) {
579 dev_err(dev->class_dev,
580 "failed to allocate dma channel %u\n",
584 devpriv->dma_chan = dma_chan;
585 dma_flags = claim_dma_lock();
586 disable_dma(devpriv->dma_chan);
587 set_dma_mode(devpriv->dma_chan, DMA_MODE_READ);
588 release_dma_lock(dma_flags);
592 dev->board_name = thisboard->name;
594 ret = comedi_alloc_subdevices(dev, 5);
598 /* analog input subdevice */
599 s = &dev->subdevices[0];
600 dev->read_subdev = s;
601 s->type = COMEDI_SUBD_AI;
603 SDF_READABLE | SDF_GROUND | SDF_COMMON | SDF_DIFF | SDF_CMD_READ;
606 s->maxdata = (1 << 12) - 1; /* 12 bit resolution */
607 s->range_table = thisboard->ai_range_table;
608 s->do_cmd = labpc_ai_cmd;
609 s->do_cmdtest = labpc_ai_cmdtest;
610 s->insn_read = labpc_ai_rinsn;
611 s->cancel = labpc_cancel;
614 s = &dev->subdevices[1];
615 if (thisboard->has_ao) {
617 * Could provide command support, except it only has a
618 * one sample hardware buffer for analog output and no
621 s->type = COMEDI_SUBD_AO;
622 s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_GROUND;
623 s->n_chan = NUM_AO_CHAN;
624 s->maxdata = (1 << 12) - 1; /* 12 bit resolution */
625 s->range_table = &range_labpc_ao;
626 s->insn_read = labpc_ao_rinsn;
627 s->insn_write = labpc_ao_winsn;
628 /* initialize analog outputs to a known value */
629 for (i = 0; i < s->n_chan; i++) {
630 devpriv->ao_value[i] = s->maxdata / 2;
631 lsb = devpriv->ao_value[i] & 0xff;
632 msb = (devpriv->ao_value[i] >> 8) & 0xff;
633 devpriv->write_byte(lsb, dev->iobase + DAC_LSB_REG(i));
634 devpriv->write_byte(msb, dev->iobase + DAC_MSB_REG(i));
637 s->type = COMEDI_SUBD_UNUSED;
641 s = &dev->subdevices[2];
642 /* if board uses io memory we have to give a custom callback
643 * function to the 8255 driver */
644 if (thisboard->memory_mapped_io)
645 subdev_8255_init(dev, s, labpc_dio_mem_callback,
646 (unsigned long)(dev->iobase + DIO_BASE_REG));
648 subdev_8255_init(dev, s, NULL, dev->iobase + DIO_BASE_REG);
650 /* calibration subdevices for boards that have one */
651 s = &dev->subdevices[3];
652 if (thisboard->register_layout == labpc_1200_layout) {
653 s->type = COMEDI_SUBD_CALIB;
654 s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
657 s->insn_read = labpc_calib_read_insn;
658 s->insn_write = labpc_calib_write_insn;
660 for (i = 0; i < s->n_chan; i++)
661 write_caldac(dev, i, s->maxdata / 2);
663 s->type = COMEDI_SUBD_UNUSED;
666 s = &dev->subdevices[4];
667 if (thisboard->register_layout == labpc_1200_layout) {
668 s->type = COMEDI_SUBD_MEMORY;
669 s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
670 s->n_chan = EEPROM_SIZE;
672 s->insn_read = labpc_eeprom_read_insn;
673 s->insn_write = labpc_eeprom_write_insn;
675 for (i = 0; i < EEPROM_SIZE; i++)
676 devpriv->eeprom_data[i] = labpc_eeprom_read(dev, i);
678 s->type = COMEDI_SUBD_UNUSED;
682 EXPORT_SYMBOL_GPL(labpc_common_attach);
684 static const struct labpc_board_struct *
685 labpc_pci_find_boardinfo(struct pci_dev *pcidev)
687 unsigned int device_id = pcidev->device;
690 for (n = 0; n < ARRAY_SIZE(labpc_boards); n++) {
691 const struct labpc_board_struct *board = &labpc_boards[n];
692 if (board->bustype == pci_bustype &&
693 board->device_id == device_id)
699 static int labpc_auto_attach(struct comedi_device *dev,
700 unsigned long context_unused)
702 struct pci_dev *pcidev = comedi_to_pci_dev(dev);
703 struct labpc_private *devpriv;
704 unsigned long iobase;
708 if (!IS_ENABLED(CONFIG_COMEDI_PCI_DRIVERS))
711 devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
714 dev->private = devpriv;
716 dev->board_ptr = labpc_pci_find_boardinfo(pcidev);
719 devpriv->mite = mite_alloc(pcidev);
722 ret = mite_setup(devpriv->mite);
725 iobase = (unsigned long)devpriv->mite->daq_io_addr;
726 irq = mite_irq(devpriv->mite);
727 return labpc_common_attach(dev, iobase, irq, 0);
730 static int labpc_attach(struct comedi_device *dev, struct comedi_devconfig *it)
732 struct labpc_private *devpriv;
733 unsigned long iobase = 0;
734 unsigned int irq = 0;
735 unsigned int dma_chan = 0;
737 devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
740 dev->private = devpriv;
742 /* get base address, irq etc. based on bustype */
743 switch (thisboard->bustype) {
745 #ifdef CONFIG_ISA_DMA_API
746 iobase = it->options[0];
747 irq = it->options[1];
748 dma_chan = it->options[2];
750 dev_err(dev->class_dev,
751 "ni_labpc driver has not been built with ISA DMA support.\n");
756 #ifdef CONFIG_COMEDI_PCI_DRIVERS
757 dev_err(dev->class_dev,
758 "manual configuration of PCI board '%s' is not supported\n",
762 dev_err(dev->class_dev,
763 "ni_labpc driver has not been built with PCI support.\n");
768 dev_err(dev->class_dev,
769 "ni_labpc: bug! couldn't determine board type\n");
774 return labpc_common_attach(dev, iobase, irq, dma_chan);
777 void labpc_common_detach(struct comedi_device *dev)
779 struct labpc_private *devpriv = dev->private;
780 struct comedi_subdevice *s;
784 if (dev->subdevices) {
785 s = &dev->subdevices[2];
786 subdev_8255_cleanup(dev, s);
788 #ifdef CONFIG_ISA_DMA_API
789 /* only free stuff if it has been allocated by _attach */
790 kfree(devpriv->dma_buffer);
791 if (devpriv->dma_chan)
792 free_dma(devpriv->dma_chan);
795 free_irq(dev->irq, dev);
796 if (thisboard->bustype == isa_bustype && dev->iobase)
797 release_region(dev->iobase, LABPC_SIZE);
798 #ifdef CONFIG_COMEDI_PCI_DRIVERS
800 mite_unsetup(devpriv->mite);
801 mite_free(devpriv->mite);
805 EXPORT_SYMBOL_GPL(labpc_common_detach);
807 static void labpc_clear_adc_fifo(const struct comedi_device *dev)
809 struct labpc_private *devpriv = dev->private;
811 devpriv->write_byte(0x1, dev->iobase + ADC_CLEAR_REG);
812 devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
813 devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
816 static int labpc_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
818 struct labpc_private *devpriv = dev->private;
821 spin_lock_irqsave(&dev->spinlock, flags);
822 devpriv->command2_bits &= ~SWTRIG_BIT & ~HWTRIG_BIT & ~PRETRIG_BIT;
823 devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
824 spin_unlock_irqrestore(&dev->spinlock, flags);
826 devpriv->command3_bits = 0;
827 devpriv->write_byte(devpriv->command3_bits, dev->iobase + COMMAND3_REG);
832 static enum scan_mode labpc_ai_scan_mode(const struct comedi_cmd *cmd)
834 if (cmd->chanlist_len == 1)
835 return MODE_SINGLE_CHAN;
837 /* chanlist may be NULL during cmdtest. */
838 if (cmd->chanlist == NULL)
839 return MODE_MULT_CHAN_UP;
841 if (CR_CHAN(cmd->chanlist[0]) == CR_CHAN(cmd->chanlist[1]))
842 return MODE_SINGLE_CHAN_INTERVAL;
844 if (CR_CHAN(cmd->chanlist[0]) < CR_CHAN(cmd->chanlist[1]))
845 return MODE_MULT_CHAN_UP;
847 if (CR_CHAN(cmd->chanlist[0]) > CR_CHAN(cmd->chanlist[1]))
848 return MODE_MULT_CHAN_DOWN;
850 pr_err("ni_labpc: bug! cannot determine AI scan mode\n");
854 static int labpc_ai_chanlist_invalid(const struct comedi_device *dev,
855 const struct comedi_cmd *cmd,
858 int channel, range, aref, i;
860 if (cmd->chanlist == NULL)
863 if (mode == MODE_SINGLE_CHAN)
866 if (mode == MODE_SINGLE_CHAN_INTERVAL) {
867 if (cmd->chanlist_len > 0xff) {
869 "ni_labpc: chanlist too long for single channel interval mode\n");
874 channel = CR_CHAN(cmd->chanlist[0]);
875 range = CR_RANGE(cmd->chanlist[0]);
876 aref = CR_AREF(cmd->chanlist[0]);
878 for (i = 0; i < cmd->chanlist_len; i++) {
881 case MODE_SINGLE_CHAN_INTERVAL:
882 if (CR_CHAN(cmd->chanlist[i]) != channel) {
884 "channel scanning order specified in chanlist is not supported by hardware.\n");
888 case MODE_MULT_CHAN_UP:
889 if (CR_CHAN(cmd->chanlist[i]) != i) {
891 "channel scanning order specified in chanlist is not supported by hardware.\n");
895 case MODE_MULT_CHAN_DOWN:
896 if (CR_CHAN(cmd->chanlist[i]) !=
897 cmd->chanlist_len - i - 1) {
899 "channel scanning order specified in chanlist is not supported by hardware.\n");
904 dev_err(dev->class_dev,
905 "ni_labpc: bug! in chanlist check\n");
910 if (CR_RANGE(cmd->chanlist[i]) != range) {
912 "entries in chanlist must all have the same range\n");
916 if (CR_AREF(cmd->chanlist[i]) != aref) {
918 "entries in chanlist must all have the same reference\n");
926 static int labpc_use_continuous_mode(const struct comedi_cmd *cmd,
929 if (mode == MODE_SINGLE_CHAN)
932 if (cmd->scan_begin_src == TRIG_FOLLOW)
938 static unsigned int labpc_ai_convert_period(const struct comedi_cmd *cmd,
941 if (cmd->convert_src != TRIG_TIMER)
944 if (mode == MODE_SINGLE_CHAN && cmd->scan_begin_src == TRIG_TIMER)
945 return cmd->scan_begin_arg;
947 return cmd->convert_arg;
950 static void labpc_set_ai_convert_period(struct comedi_cmd *cmd,
951 enum scan_mode mode, unsigned int ns)
953 if (cmd->convert_src != TRIG_TIMER)
956 if (mode == MODE_SINGLE_CHAN &&
957 cmd->scan_begin_src == TRIG_TIMER) {
958 cmd->scan_begin_arg = ns;
959 if (cmd->convert_arg > cmd->scan_begin_arg)
960 cmd->convert_arg = cmd->scan_begin_arg;
962 cmd->convert_arg = ns;
965 static unsigned int labpc_ai_scan_period(const struct comedi_cmd *cmd,
968 if (cmd->scan_begin_src != TRIG_TIMER)
971 if (mode == MODE_SINGLE_CHAN && cmd->convert_src == TRIG_TIMER)
974 return cmd->scan_begin_arg;
977 static void labpc_set_ai_scan_period(struct comedi_cmd *cmd,
978 enum scan_mode mode, unsigned int ns)
980 if (cmd->scan_begin_src != TRIG_TIMER)
983 if (mode == MODE_SINGLE_CHAN && cmd->convert_src == TRIG_TIMER)
986 cmd->scan_begin_arg = ns;
989 static int labpc_ai_cmdtest(struct comedi_device *dev,
990 struct comedi_subdevice *s, struct comedi_cmd *cmd)
994 unsigned int stop_mask;
997 /* Step 1 : check if triggers are trivially valid */
999 err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
1000 err |= cfc_check_trigger_src(&cmd->scan_begin_src,
1001 TRIG_TIMER | TRIG_FOLLOW | TRIG_EXT);
1002 err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT);
1003 err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
1005 stop_mask = TRIG_COUNT | TRIG_NONE;
1006 if (thisboard->register_layout == labpc_1200_layout)
1007 stop_mask |= TRIG_EXT;
1008 err |= cfc_check_trigger_src(&cmd->stop_src, stop_mask);
1013 /* Step 2a : make sure trigger sources are unique */
1015 err |= cfc_check_trigger_is_unique(cmd->start_src);
1016 err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
1017 err |= cfc_check_trigger_is_unique(cmd->convert_src);
1018 err |= cfc_check_trigger_is_unique(cmd->stop_src);
1020 /* Step 2b : and mutually compatible */
1022 /* can't have external stop and start triggers at once */
1023 if (cmd->start_src == TRIG_EXT && cmd->stop_src == TRIG_EXT)
1029 /* Step 3: check if arguments are trivially valid */
1031 if (cmd->start_arg == TRIG_NOW)
1032 err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
1034 if (!cmd->chanlist_len)
1036 err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
1038 if (cmd->convert_src == TRIG_TIMER)
1039 err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
1040 thisboard->ai_speed);
1042 /* make sure scan timing is not too fast */
1043 if (cmd->scan_begin_src == TRIG_TIMER) {
1044 if (cmd->convert_src == TRIG_TIMER)
1045 err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
1046 cmd->convert_arg * cmd->chanlist_len);
1047 err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
1048 thisboard->ai_speed * cmd->chanlist_len);
1051 switch (cmd->stop_src) {
1053 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
1056 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
1059 * TRIG_EXT doesn't care since it doesn't
1060 * trigger off a numbered channel
1069 /* step 4: fix up any arguments */
1071 tmp = cmd->convert_arg;
1072 tmp2 = cmd->scan_begin_arg;
1073 mode = labpc_ai_scan_mode(cmd);
1074 labpc_adc_timing(dev, cmd, mode);
1075 if (tmp != cmd->convert_arg || tmp2 != cmd->scan_begin_arg)
1081 if (labpc_ai_chanlist_invalid(dev, cmd, mode))
1087 static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
1089 struct labpc_private *devpriv = dev->private;
1090 int channel, range, aref;
1091 #ifdef CONFIG_ISA_DMA_API
1092 unsigned long irq_flags;
1095 struct comedi_async *async = s->async;
1096 struct comedi_cmd *cmd = &async->cmd;
1097 enum transfer_type xfer;
1098 enum scan_mode mode;
1099 unsigned long flags;
1102 comedi_error(dev, "no irq assigned, cannot perform command");
1106 range = CR_RANGE(cmd->chanlist[0]);
1107 aref = CR_AREF(cmd->chanlist[0]);
1109 /* make sure board is disabled before setting up acquisition */
1110 spin_lock_irqsave(&dev->spinlock, flags);
1111 devpriv->command2_bits &= ~SWTRIG_BIT & ~HWTRIG_BIT & ~PRETRIG_BIT;
1112 devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
1113 spin_unlock_irqrestore(&dev->spinlock, flags);
1115 devpriv->command3_bits = 0;
1116 devpriv->write_byte(devpriv->command3_bits, dev->iobase + COMMAND3_REG);
1118 /* initialize software conversion count */
1119 if (cmd->stop_src == TRIG_COUNT)
1120 devpriv->count = cmd->stop_arg * cmd->chanlist_len;
1122 /* setup hardware conversion counter */
1123 if (cmd->stop_src == TRIG_EXT) {
1125 * load counter a1 with count of 3
1126 * (pc+ manual says this is minimum allowed) using mode 0
1128 ret = labpc_counter_load(dev, dev->iobase + COUNTER_A_BASE_REG,
1131 comedi_error(dev, "error loading counter a1");
1135 * otherwise, just put a1 in mode 0
1136 * with no count to set its output low
1138 devpriv->write_byte(INIT_A1_BITS,
1139 dev->iobase + COUNTER_A_CONTROL_REG);
1141 #ifdef CONFIG_ISA_DMA_API
1142 /* figure out what method we will use to transfer data */
1143 if (devpriv->dma_chan && /* need a dma channel allocated */
1145 * dma unsafe at RT priority,
1146 * and too much setup time for TRIG_WAKE_EOS for
1148 (cmd->flags & (TRIG_WAKE_EOS | TRIG_RT)) == 0 &&
1149 /* only available on the isa boards */
1150 thisboard->bustype == isa_bustype) {
1151 xfer = isa_dma_transfer;
1152 /* pc-plus has no fifo-half full interrupt */
1155 if (thisboard->register_layout == labpc_1200_layout &&
1156 /* wake-end-of-scan should interrupt on fifo not empty */
1157 (cmd->flags & TRIG_WAKE_EOS) == 0 &&
1158 /* make sure we are taking more than just a few points */
1159 (cmd->stop_src != TRIG_COUNT || devpriv->count > 256)) {
1160 xfer = fifo_half_full_transfer;
1162 xfer = fifo_not_empty_transfer;
1163 devpriv->current_transfer = xfer;
1164 mode = labpc_ai_scan_mode(cmd);
1166 /* setup command6 register for 1200 boards */
1167 if (thisboard->register_layout == labpc_1200_layout) {
1168 /* reference inputs to ground or common? */
1169 if (aref != AREF_GROUND)
1170 devpriv->command6_bits |= ADC_COMMON_BIT;
1172 devpriv->command6_bits &= ~ADC_COMMON_BIT;
1173 /* bipolar or unipolar range? */
1174 if (thisboard->ai_range_is_unipolar[range])
1175 devpriv->command6_bits |= ADC_UNIP_BIT;
1177 devpriv->command6_bits &= ~ADC_UNIP_BIT;
1178 /* interrupt on fifo half full? */
1179 if (xfer == fifo_half_full_transfer)
1180 devpriv->command6_bits |= ADC_FHF_INTR_EN_BIT;
1182 devpriv->command6_bits &= ~ADC_FHF_INTR_EN_BIT;
1183 /* enable interrupt on counter a1 terminal count? */
1184 if (cmd->stop_src == TRIG_EXT)
1185 devpriv->command6_bits |= A1_INTR_EN_BIT;
1187 devpriv->command6_bits &= ~A1_INTR_EN_BIT;
1188 /* are we scanning up or down through channels? */
1189 if (mode == MODE_MULT_CHAN_UP)
1190 devpriv->command6_bits |= ADC_SCAN_UP_BIT;
1192 devpriv->command6_bits &= ~ADC_SCAN_UP_BIT;
1193 /* write to register */
1194 devpriv->write_byte(devpriv->command6_bits,
1195 dev->iobase + COMMAND6_REG);
1198 /* setup channel list, etc (command1 register) */
1199 devpriv->command1_bits = 0;
1200 if (mode == MODE_MULT_CHAN_UP)
1201 channel = CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]);
1203 channel = CR_CHAN(cmd->chanlist[0]);
1204 /* munge channel bits for differential / scan disabled mode */
1205 if ((mode == MODE_SINGLE_CHAN || mode == MODE_SINGLE_CHAN_INTERVAL) &&
1208 devpriv->command1_bits |= ADC_CHAN_BITS(channel);
1209 devpriv->command1_bits |= thisboard->ai_range_code[range];
1210 devpriv->write_byte(devpriv->command1_bits, dev->iobase + COMMAND1_REG);
1211 /* manual says to set scan enable bit on second pass */
1212 if (mode == MODE_MULT_CHAN_UP || mode == MODE_MULT_CHAN_DOWN) {
1213 devpriv->command1_bits |= ADC_SCAN_EN_BIT;
1214 /* need a brief delay before enabling scan, or scan
1215 * list will get screwed when you switch
1216 * between scan up to scan down mode - dunno why */
1218 devpriv->write_byte(devpriv->command1_bits,
1219 dev->iobase + COMMAND1_REG);
1222 devpriv->write_byte(cmd->chanlist_len,
1223 dev->iobase + INTERVAL_COUNT_REG);
1225 devpriv->write_byte(INTERVAL_LOAD_BITS,
1226 dev->iobase + INTERVAL_LOAD_REG);
1228 if (cmd->convert_src == TRIG_TIMER || cmd->scan_begin_src == TRIG_TIMER) {
1230 labpc_adc_timing(dev, cmd, mode);
1231 /* load counter b0 in mode 3 */
1232 ret = labpc_counter_load(dev, dev->iobase + COUNTER_B_BASE_REG,
1233 0, devpriv->divisor_b0, 3);
1235 comedi_error(dev, "error loading counter b0");
1239 /* set up conversion pacing */
1240 if (labpc_ai_convert_period(cmd, mode)) {
1241 /* load counter a0 in mode 2 */
1242 ret = labpc_counter_load(dev, dev->iobase + COUNTER_A_BASE_REG,
1243 0, devpriv->divisor_a0, 2);
1245 comedi_error(dev, "error loading counter a0");
1249 devpriv->write_byte(INIT_A0_BITS,
1250 dev->iobase + COUNTER_A_CONTROL_REG);
1252 /* set up scan pacing */
1253 if (labpc_ai_scan_period(cmd, mode)) {
1254 /* load counter b1 in mode 2 */
1255 ret = labpc_counter_load(dev, dev->iobase + COUNTER_B_BASE_REG,
1256 1, devpriv->divisor_b1, 2);
1258 comedi_error(dev, "error loading counter b1");
1263 labpc_clear_adc_fifo(dev);
1265 #ifdef CONFIG_ISA_DMA_API
1266 /* set up dma transfer */
1267 if (xfer == isa_dma_transfer) {
1268 irq_flags = claim_dma_lock();
1269 disable_dma(devpriv->dma_chan);
1270 /* clear flip-flop to make sure 2-byte registers for
1271 * count and address get set correctly */
1272 clear_dma_ff(devpriv->dma_chan);
1273 set_dma_addr(devpriv->dma_chan,
1274 virt_to_bus(devpriv->dma_buffer));
1275 /* set appropriate size of transfer */
1276 devpriv->dma_transfer_size = labpc_suggest_transfer_size(cmd);
1277 if (cmd->stop_src == TRIG_COUNT &&
1278 devpriv->count * sample_size < devpriv->dma_transfer_size) {
1279 devpriv->dma_transfer_size =
1280 devpriv->count * sample_size;
1282 set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
1283 enable_dma(devpriv->dma_chan);
1284 release_dma_lock(irq_flags);
1285 /* enable board's dma */
1286 devpriv->command3_bits |= DMA_EN_BIT | DMATC_INTR_EN_BIT;
1288 devpriv->command3_bits &= ~DMA_EN_BIT & ~DMATC_INTR_EN_BIT;
1291 /* enable error interrupts */
1292 devpriv->command3_bits |= ERR_INTR_EN_BIT;
1293 /* enable fifo not empty interrupt? */
1294 if (xfer == fifo_not_empty_transfer)
1295 devpriv->command3_bits |= ADC_FNE_INTR_EN_BIT;
1297 devpriv->command3_bits &= ~ADC_FNE_INTR_EN_BIT;
1298 devpriv->write_byte(devpriv->command3_bits, dev->iobase + COMMAND3_REG);
1300 /* setup any external triggering/pacing (command4 register) */
1301 devpriv->command4_bits = 0;
1302 if (cmd->convert_src != TRIG_EXT)
1303 devpriv->command4_bits |= EXT_CONVERT_DISABLE_BIT;
1304 /* XXX should discard first scan when using interval scanning
1305 * since manual says it is not synced with scan clock */
1306 if (labpc_use_continuous_mode(cmd, mode) == 0) {
1307 devpriv->command4_bits |= INTERVAL_SCAN_EN_BIT;
1308 if (cmd->scan_begin_src == TRIG_EXT)
1309 devpriv->command4_bits |= EXT_SCAN_EN_BIT;
1311 /* single-ended/differential */
1312 if (aref == AREF_DIFF)
1313 devpriv->command4_bits |= ADC_DIFF_BIT;
1314 devpriv->write_byte(devpriv->command4_bits, dev->iobase + COMMAND4_REG);
1316 /* startup acquisition */
1319 /* use 2 cascaded counters for pacing */
1320 spin_lock_irqsave(&dev->spinlock, flags);
1321 devpriv->command2_bits |= CASCADE_BIT;
1322 switch (cmd->start_src) {
1324 devpriv->command2_bits |= HWTRIG_BIT;
1325 devpriv->command2_bits &= ~PRETRIG_BIT & ~SWTRIG_BIT;
1328 devpriv->command2_bits |= SWTRIG_BIT;
1329 devpriv->command2_bits &= ~PRETRIG_BIT & ~HWTRIG_BIT;
1332 comedi_error(dev, "bug with start_src");
1333 spin_unlock_irqrestore(&dev->spinlock, flags);
1337 switch (cmd->stop_src) {
1339 devpriv->command2_bits |= HWTRIG_BIT | PRETRIG_BIT;
1345 comedi_error(dev, "bug with stop_src");
1346 spin_unlock_irqrestore(&dev->spinlock, flags);
1349 devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
1350 spin_unlock_irqrestore(&dev->spinlock, flags);
1355 /* interrupt service routine */
1356 static irqreturn_t labpc_interrupt(int irq, void *d)
1358 struct comedi_device *dev = d;
1359 struct labpc_private *devpriv = dev->private;
1360 struct comedi_subdevice *s = dev->read_subdev;
1361 struct comedi_async *async;
1362 struct comedi_cmd *cmd;
1364 if (dev->attached == 0) {
1365 comedi_error(dev, "premature interrupt");
1373 /* read board status */
1374 devpriv->status1_bits = devpriv->read_byte(dev->iobase + STATUS1_REG);
1375 if (thisboard->register_layout == labpc_1200_layout)
1376 devpriv->status2_bits =
1377 devpriv->read_byte(dev->iobase + STATUS2_REG);
1379 if ((devpriv->status1_bits & (DMATC_BIT | TIMER_BIT | OVERFLOW_BIT |
1380 OVERRUN_BIT | DATA_AVAIL_BIT)) == 0
1381 && (devpriv->status2_bits & A1_TC_BIT) == 0
1382 && (devpriv->status2_bits & FNHF_BIT)) {
1386 if (devpriv->status1_bits & OVERRUN_BIT) {
1387 /* clear error interrupt */
1388 devpriv->write_byte(0x1, dev->iobase + ADC_CLEAR_REG);
1389 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
1390 comedi_event(dev, s);
1391 comedi_error(dev, "overrun");
1395 #ifdef CONFIG_ISA_DMA_API
1396 if (devpriv->current_transfer == isa_dma_transfer) {
1398 * if a dma terminal count of external stop trigger
1401 if (devpriv->status1_bits & DMATC_BIT ||
1402 (thisboard->register_layout == labpc_1200_layout
1403 && devpriv->status2_bits & A1_TC_BIT)) {
1404 handle_isa_dma(dev);
1408 labpc_drain_fifo(dev);
1410 if (devpriv->status1_bits & TIMER_BIT) {
1411 comedi_error(dev, "handled timer interrupt?");
1413 devpriv->write_byte(0x1, dev->iobase + TIMER_CLEAR_REG);
1416 if (devpriv->status1_bits & OVERFLOW_BIT) {
1417 /* clear error interrupt */
1418 devpriv->write_byte(0x1, dev->iobase + ADC_CLEAR_REG);
1419 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
1420 comedi_event(dev, s);
1421 comedi_error(dev, "overflow");
1424 /* handle external stop trigger */
1425 if (cmd->stop_src == TRIG_EXT) {
1426 if (devpriv->status2_bits & A1_TC_BIT) {
1427 labpc_drain_dregs(dev);
1428 labpc_cancel(dev, s);
1429 async->events |= COMEDI_CB_EOA;
1433 /* TRIG_COUNT end of acquisition */
1434 if (cmd->stop_src == TRIG_COUNT) {
1435 if (devpriv->count == 0) {
1436 labpc_cancel(dev, s);
1437 async->events |= COMEDI_CB_EOA;
1441 comedi_event(dev, s);
1445 /* read all available samples from ai fifo */
1446 static int labpc_drain_fifo(struct comedi_device *dev)
1448 struct labpc_private *devpriv = dev->private;
1449 unsigned int lsb, msb;
1451 struct comedi_async *async = dev->read_subdev->async;
1452 const int timeout = 10000;
1455 devpriv->status1_bits = devpriv->read_byte(dev->iobase + STATUS1_REG);
1457 for (i = 0; (devpriv->status1_bits & DATA_AVAIL_BIT) && i < timeout;
1459 /* quit if we have all the data we want */
1460 if (async->cmd.stop_src == TRIG_COUNT) {
1461 if (devpriv->count == 0)
1465 lsb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
1466 msb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
1467 data = (msb << 8) | lsb;
1468 cfc_write_to_buffer(dev->read_subdev, data);
1469 devpriv->status1_bits =
1470 devpriv->read_byte(dev->iobase + STATUS1_REG);
1473 comedi_error(dev, "ai timeout, fifo never empties");
1474 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
1481 #ifdef CONFIG_ISA_DMA_API
1482 static void labpc_drain_dma(struct comedi_device *dev)
1484 struct labpc_private *devpriv = dev->private;
1485 struct comedi_subdevice *s = dev->read_subdev;
1486 struct comedi_async *async = s->async;
1488 unsigned long flags;
1489 unsigned int max_points, num_points, residue, leftover;
1492 status = devpriv->status1_bits;
1494 flags = claim_dma_lock();
1495 disable_dma(devpriv->dma_chan);
1496 /* clear flip-flop to make sure 2-byte registers for
1497 * count and address get set correctly */
1498 clear_dma_ff(devpriv->dma_chan);
1500 /* figure out how many points to read */
1501 max_points = devpriv->dma_transfer_size / sample_size;
1502 /* residue is the number of points left to be done on the dma
1503 * transfer. It should always be zero at this point unless
1504 * the stop_src is set to external triggering.
1506 residue = get_dma_residue(devpriv->dma_chan) / sample_size;
1507 num_points = max_points - residue;
1508 if (devpriv->count < num_points && async->cmd.stop_src == TRIG_COUNT)
1509 num_points = devpriv->count;
1511 /* figure out how many points will be stored next time */
1513 if (async->cmd.stop_src != TRIG_COUNT) {
1514 leftover = devpriv->dma_transfer_size / sample_size;
1515 } else if (devpriv->count > num_points) {
1516 leftover = devpriv->count - num_points;
1517 if (leftover > max_points)
1518 leftover = max_points;
1521 /* write data to comedi buffer */
1522 for (i = 0; i < num_points; i++)
1523 cfc_write_to_buffer(s, devpriv->dma_buffer[i]);
1525 if (async->cmd.stop_src == TRIG_COUNT)
1526 devpriv->count -= num_points;
1528 /* set address and count for next transfer */
1529 set_dma_addr(devpriv->dma_chan, virt_to_bus(devpriv->dma_buffer));
1530 set_dma_count(devpriv->dma_chan, leftover * sample_size);
1531 release_dma_lock(flags);
1533 async->events |= COMEDI_CB_BLOCK;
1536 static void handle_isa_dma(struct comedi_device *dev)
1538 struct labpc_private *devpriv = dev->private;
1540 labpc_drain_dma(dev);
1542 enable_dma(devpriv->dma_chan);
1544 /* clear dma tc interrupt */
1545 devpriv->write_byte(0x1, dev->iobase + DMATC_CLEAR_REG);
1549 /* makes sure all data acquired by board is transferred to comedi (used
1550 * when acquisition is terminated by stop_src == TRIG_EXT). */
1551 static void labpc_drain_dregs(struct comedi_device *dev)
1553 #ifdef CONFIG_ISA_DMA_API
1554 struct labpc_private *devpriv = dev->private;
1556 if (devpriv->current_transfer == isa_dma_transfer)
1557 labpc_drain_dma(dev);
1560 labpc_drain_fifo(dev);
1563 static int labpc_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
1564 struct comedi_insn *insn, unsigned int *data)
1566 struct labpc_private *devpriv = dev->private;
1571 unsigned long flags;
1573 /* disable timed conversions */
1574 spin_lock_irqsave(&dev->spinlock, flags);
1575 devpriv->command2_bits &= ~SWTRIG_BIT & ~HWTRIG_BIT & ~PRETRIG_BIT;
1576 devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
1577 spin_unlock_irqrestore(&dev->spinlock, flags);
1579 /* disable interrupt generation and dma */
1580 devpriv->command3_bits = 0;
1581 devpriv->write_byte(devpriv->command3_bits, dev->iobase + COMMAND3_REG);
1583 /* set gain and channel */
1584 devpriv->command1_bits = 0;
1585 chan = CR_CHAN(insn->chanspec);
1586 range = CR_RANGE(insn->chanspec);
1587 devpriv->command1_bits |= thisboard->ai_range_code[range];
1588 /* munge channel bits for differential/scan disabled mode */
1589 if (CR_AREF(insn->chanspec) == AREF_DIFF)
1591 devpriv->command1_bits |= ADC_CHAN_BITS(chan);
1592 devpriv->write_byte(devpriv->command1_bits, dev->iobase + COMMAND1_REG);
1594 /* setup command6 register for 1200 boards */
1595 if (thisboard->register_layout == labpc_1200_layout) {
1596 /* reference inputs to ground or common? */
1597 if (CR_AREF(insn->chanspec) != AREF_GROUND)
1598 devpriv->command6_bits |= ADC_COMMON_BIT;
1600 devpriv->command6_bits &= ~ADC_COMMON_BIT;
1601 /* bipolar or unipolar range? */
1602 if (thisboard->ai_range_is_unipolar[range])
1603 devpriv->command6_bits |= ADC_UNIP_BIT;
1605 devpriv->command6_bits &= ~ADC_UNIP_BIT;
1606 /* don't interrupt on fifo half full */
1607 devpriv->command6_bits &= ~ADC_FHF_INTR_EN_BIT;
1608 /* don't enable interrupt on counter a1 terminal count? */
1609 devpriv->command6_bits &= ~A1_INTR_EN_BIT;
1610 /* write to register */
1611 devpriv->write_byte(devpriv->command6_bits,
1612 dev->iobase + COMMAND6_REG);
1614 /* setup command4 register */
1615 devpriv->command4_bits = 0;
1616 devpriv->command4_bits |= EXT_CONVERT_DISABLE_BIT;
1617 /* single-ended/differential */
1618 if (CR_AREF(insn->chanspec) == AREF_DIFF)
1619 devpriv->command4_bits |= ADC_DIFF_BIT;
1620 devpriv->write_byte(devpriv->command4_bits, dev->iobase + COMMAND4_REG);
1623 * initialize pacer counter output to make sure it doesn't
1624 * cause any problems
1626 devpriv->write_byte(INIT_A0_BITS, dev->iobase + COUNTER_A_CONTROL_REG);
1628 labpc_clear_adc_fifo(dev);
1630 for (n = 0; n < insn->n; n++) {
1631 /* trigger conversion */
1632 devpriv->write_byte(0x1, dev->iobase + ADC_CONVERT_REG);
1634 for (i = 0; i < timeout; i++) {
1635 if (devpriv->read_byte(dev->iobase +
1636 STATUS1_REG) & DATA_AVAIL_BIT)
1641 comedi_error(dev, "timeout");
1644 lsb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
1645 msb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
1646 data[n] = (msb << 8) | lsb;
1652 /* analog output insn */
1653 static int labpc_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
1654 struct comedi_insn *insn, unsigned int *data)
1656 struct labpc_private *devpriv = dev->private;
1658 unsigned long flags;
1661 channel = CR_CHAN(insn->chanspec);
1663 /* turn off pacing of analog output channel */
1664 /* note: hardware bug in daqcard-1200 means pacing cannot
1665 * be independently enabled/disabled for its the two channels */
1666 spin_lock_irqsave(&dev->spinlock, flags);
1667 devpriv->command2_bits &= ~DAC_PACED_BIT(channel);
1668 devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
1669 spin_unlock_irqrestore(&dev->spinlock, flags);
1672 if (thisboard->register_layout == labpc_1200_layout) {
1673 range = CR_RANGE(insn->chanspec);
1674 if (range & AO_RANGE_IS_UNIPOLAR)
1675 devpriv->command6_bits |= DAC_UNIP_BIT(channel);
1677 devpriv->command6_bits &= ~DAC_UNIP_BIT(channel);
1678 /* write to register */
1679 devpriv->write_byte(devpriv->command6_bits,
1680 dev->iobase + COMMAND6_REG);
1683 lsb = data[0] & 0xff;
1684 msb = (data[0] >> 8) & 0xff;
1685 devpriv->write_byte(lsb, dev->iobase + DAC_LSB_REG(channel));
1686 devpriv->write_byte(msb, dev->iobase + DAC_MSB_REG(channel));
1688 /* remember value for readback */
1689 devpriv->ao_value[channel] = data[0];
1694 /* analog output readback insn */
1695 static int labpc_ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
1696 struct comedi_insn *insn, unsigned int *data)
1698 struct labpc_private *devpriv = dev->private;
1700 data[0] = devpriv->ao_value[CR_CHAN(insn->chanspec)];
1705 static int labpc_calib_read_insn(struct comedi_device *dev,
1706 struct comedi_subdevice *s,
1707 struct comedi_insn *insn, unsigned int *data)
1709 struct labpc_private *devpriv = dev->private;
1711 data[0] = devpriv->caldac[CR_CHAN(insn->chanspec)];
1716 static int labpc_calib_write_insn(struct comedi_device *dev,
1717 struct comedi_subdevice *s,
1718 struct comedi_insn *insn, unsigned int *data)
1720 int channel = CR_CHAN(insn->chanspec);
1722 write_caldac(dev, channel, data[0]);
1726 static int labpc_eeprom_read_insn(struct comedi_device *dev,
1727 struct comedi_subdevice *s,
1728 struct comedi_insn *insn, unsigned int *data)
1730 struct labpc_private *devpriv = dev->private;
1732 data[0] = devpriv->eeprom_data[CR_CHAN(insn->chanspec)];
1737 static int labpc_eeprom_write_insn(struct comedi_device *dev,
1738 struct comedi_subdevice *s,
1739 struct comedi_insn *insn, unsigned int *data)
1741 int channel = CR_CHAN(insn->chanspec);
1744 /* only allow writes to user area of eeprom */
1745 if (channel < 16 || channel > 127) {
1746 dev_dbg(dev->class_dev,
1747 "eeprom writes are only allowed to channels 16 through 127 (the pointer and user areas)\n");
1751 ret = labpc_eeprom_write(dev, channel, data[0]);
1758 #ifdef CONFIG_ISA_DMA_API
1759 /* utility function that suggests a dma transfer size in bytes */
1760 static unsigned int labpc_suggest_transfer_size(const struct comedi_cmd *cmd)
1765 if (cmd->convert_src == TRIG_TIMER)
1766 freq = 1000000000 / cmd->convert_arg;
1767 /* return some default value */
1771 /* make buffer fill in no more than 1/3 second */
1772 size = (freq / 3) * sample_size;
1774 /* set a minimum and maximum size allowed */
1775 if (size > dma_buffer_size)
1776 size = dma_buffer_size - dma_buffer_size % sample_size;
1777 else if (size < sample_size)
1784 /* figures out what counter values to use based on command */
1785 static void labpc_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd,
1786 enum scan_mode mode)
1788 struct labpc_private *devpriv = dev->private;
1789 /* max value for 16 bit counter in mode 2 */
1790 const int max_counter_value = 0x10000;
1791 /* min value for 16 bit counter in mode 2 */
1792 const int min_counter_value = 2;
1793 unsigned int base_period;
1794 unsigned int scan_period;
1795 unsigned int convert_period;
1798 * if both convert and scan triggers are TRIG_TIMER, then they
1799 * both rely on counter b0
1801 convert_period = labpc_ai_convert_period(cmd, mode);
1802 scan_period = labpc_ai_scan_period(cmd, mode);
1803 if (convert_period && scan_period) {
1805 * pick the lowest b0 divisor value we can (for maximum input
1806 * clock speed on convert and scan counters)
1808 devpriv->divisor_b0 = (scan_period - 1) /
1809 (LABPC_TIMER_BASE * max_counter_value) + 1;
1810 if (devpriv->divisor_b0 < min_counter_value)
1811 devpriv->divisor_b0 = min_counter_value;
1812 if (devpriv->divisor_b0 > max_counter_value)
1813 devpriv->divisor_b0 = max_counter_value;
1815 base_period = LABPC_TIMER_BASE * devpriv->divisor_b0;
1817 /* set a0 for conversion frequency and b1 for scan frequency */
1818 switch (cmd->flags & TRIG_ROUND_MASK) {
1820 case TRIG_ROUND_NEAREST:
1821 devpriv->divisor_a0 =
1822 (convert_period + (base_period / 2)) / base_period;
1823 devpriv->divisor_b1 =
1824 (scan_period + (base_period / 2)) / base_period;
1827 devpriv->divisor_a0 =
1828 (convert_period + (base_period - 1)) / base_period;
1829 devpriv->divisor_b1 =
1830 (scan_period + (base_period - 1)) / base_period;
1832 case TRIG_ROUND_DOWN:
1833 devpriv->divisor_a0 = convert_period / base_period;
1834 devpriv->divisor_b1 = scan_period / base_period;
1837 /* make sure a0 and b1 values are acceptable */
1838 if (devpriv->divisor_a0 < min_counter_value)
1839 devpriv->divisor_a0 = min_counter_value;
1840 if (devpriv->divisor_a0 > max_counter_value)
1841 devpriv->divisor_a0 = max_counter_value;
1842 if (devpriv->divisor_b1 < min_counter_value)
1843 devpriv->divisor_b1 = min_counter_value;
1844 if (devpriv->divisor_b1 > max_counter_value)
1845 devpriv->divisor_b1 = max_counter_value;
1846 /* write corrected timings to command */
1847 labpc_set_ai_convert_period(cmd, mode,
1848 base_period * devpriv->divisor_a0);
1849 labpc_set_ai_scan_period(cmd, mode,
1850 base_period * devpriv->divisor_b1);
1852 * if only one TRIG_TIMER is used, we can employ the generic
1853 * cascaded timing functions
1855 } else if (scan_period) {
1857 * calculate cascaded counter values
1858 * that give desired scan timing
1860 i8253_cascade_ns_to_timer_2div(LABPC_TIMER_BASE,
1861 &(devpriv->divisor_b1),
1862 &(devpriv->divisor_b0),
1864 cmd->flags & TRIG_ROUND_MASK);
1865 labpc_set_ai_scan_period(cmd, mode, scan_period);
1866 } else if (convert_period) {
1868 * calculate cascaded counter values
1869 * that give desired conversion timing
1871 i8253_cascade_ns_to_timer_2div(LABPC_TIMER_BASE,
1872 &(devpriv->divisor_a0),
1873 &(devpriv->divisor_b0),
1875 cmd->flags & TRIG_ROUND_MASK);
1876 labpc_set_ai_convert_period(cmd, mode, convert_period);
1880 static int labpc_dio_mem_callback(int dir, int port, int data,
1881 unsigned long iobase)
1884 writeb(data, (void __iomem *)(iobase + port));
1887 return readb((void __iomem *)(iobase + port));
1891 /* lowlevel write to eeprom/dac */
1892 static void labpc_serial_out(struct comedi_device *dev, unsigned int value,
1893 unsigned int value_width)
1895 struct labpc_private *devpriv = dev->private;
1898 for (i = 1; i <= value_width; i++) {
1899 /* clear serial clock */
1900 devpriv->command5_bits &= ~SCLOCK_BIT;
1901 /* send bits most significant bit first */
1902 if (value & (1 << (value_width - i)))
1903 devpriv->command5_bits |= SDATA_BIT;
1905 devpriv->command5_bits &= ~SDATA_BIT;
1907 devpriv->write_byte(devpriv->command5_bits,
1908 dev->iobase + COMMAND5_REG);
1909 /* set clock to load bit */
1910 devpriv->command5_bits |= SCLOCK_BIT;
1912 devpriv->write_byte(devpriv->command5_bits,
1913 dev->iobase + COMMAND5_REG);
1917 /* lowlevel read from eeprom */
1918 static unsigned int labpc_serial_in(struct comedi_device *dev)
1920 struct labpc_private *devpriv = dev->private;
1921 unsigned int value = 0;
1923 const int value_width = 8; /* number of bits wide values are */
1925 for (i = 1; i <= value_width; i++) {
1926 /* set serial clock */
1927 devpriv->command5_bits |= SCLOCK_BIT;
1929 devpriv->write_byte(devpriv->command5_bits,
1930 dev->iobase + COMMAND5_REG);
1931 /* clear clock bit */
1932 devpriv->command5_bits &= ~SCLOCK_BIT;
1934 devpriv->write_byte(devpriv->command5_bits,
1935 dev->iobase + COMMAND5_REG);
1936 /* read bits most significant bit first */
1938 devpriv->status2_bits =
1939 devpriv->read_byte(dev->iobase + STATUS2_REG);
1940 if (devpriv->status2_bits & EEPROM_OUT_BIT)
1941 value |= 1 << (value_width - i);
1947 static unsigned int labpc_eeprom_read(struct comedi_device *dev,
1948 unsigned int address)
1950 struct labpc_private *devpriv = dev->private;
1952 /* bits to tell eeprom to expect a read */
1953 const int read_instruction = 0x3;
1954 /* 8 bit write lengths to eeprom */
1955 const int write_length = 8;
1957 /* enable read/write to eeprom */
1958 devpriv->command5_bits &= ~EEPROM_EN_BIT;
1960 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
1961 devpriv->command5_bits |= EEPROM_EN_BIT | EEPROM_WRITE_UNPROTECT_BIT;
1963 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
1965 /* send read instruction */
1966 labpc_serial_out(dev, read_instruction, write_length);
1967 /* send 8 bit address to read from */
1968 labpc_serial_out(dev, address, write_length);
1970 value = labpc_serial_in(dev);
1972 /* disable read/write to eeprom */
1973 devpriv->command5_bits &= ~EEPROM_EN_BIT & ~EEPROM_WRITE_UNPROTECT_BIT;
1975 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
1980 static int labpc_eeprom_write(struct comedi_device *dev,
1981 unsigned int address, unsigned int value)
1983 struct labpc_private *devpriv = dev->private;
1984 const int write_enable_instruction = 0x6;
1985 const int write_instruction = 0x2;
1986 const int write_length = 8; /* 8 bit write lengths to eeprom */
1987 const int write_in_progress_bit = 0x1;
1988 const int timeout = 10000;
1991 /* make sure there isn't already a write in progress */
1992 for (i = 0; i < timeout; i++) {
1993 if ((labpc_eeprom_read_status(dev) & write_in_progress_bit) ==
1998 comedi_error(dev, "eeprom write timed out");
2001 /* update software copy of eeprom */
2002 devpriv->eeprom_data[address] = value;
2004 /* enable read/write to eeprom */
2005 devpriv->command5_bits &= ~EEPROM_EN_BIT;
2007 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2008 devpriv->command5_bits |= EEPROM_EN_BIT | EEPROM_WRITE_UNPROTECT_BIT;
2010 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2012 /* send write_enable instruction */
2013 labpc_serial_out(dev, write_enable_instruction, write_length);
2014 devpriv->command5_bits &= ~EEPROM_EN_BIT;
2016 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2018 /* send write instruction */
2019 devpriv->command5_bits |= EEPROM_EN_BIT;
2021 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2022 labpc_serial_out(dev, write_instruction, write_length);
2023 /* send 8 bit address to write to */
2024 labpc_serial_out(dev, address, write_length);
2026 labpc_serial_out(dev, value, write_length);
2027 devpriv->command5_bits &= ~EEPROM_EN_BIT;
2029 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2031 /* disable read/write to eeprom */
2032 devpriv->command5_bits &= ~EEPROM_EN_BIT & ~EEPROM_WRITE_UNPROTECT_BIT;
2034 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2039 static unsigned int labpc_eeprom_read_status(struct comedi_device *dev)
2041 struct labpc_private *devpriv = dev->private;
2043 const int read_status_instruction = 0x5;
2044 const int write_length = 8; /* 8 bit write lengths to eeprom */
2046 /* enable read/write to eeprom */
2047 devpriv->command5_bits &= ~EEPROM_EN_BIT;
2049 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2050 devpriv->command5_bits |= EEPROM_EN_BIT | EEPROM_WRITE_UNPROTECT_BIT;
2052 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2054 /* send read status instruction */
2055 labpc_serial_out(dev, read_status_instruction, write_length);
2057 value = labpc_serial_in(dev);
2059 /* disable read/write to eeprom */
2060 devpriv->command5_bits &= ~EEPROM_EN_BIT & ~EEPROM_WRITE_UNPROTECT_BIT;
2062 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2067 /* writes to 8 bit calibration dacs */
2068 static void write_caldac(struct comedi_device *dev, unsigned int channel,
2071 struct labpc_private *devpriv = dev->private;
2073 if (value == devpriv->caldac[channel])
2075 devpriv->caldac[channel] = value;
2077 /* clear caldac load bit and make sure we don't write to eeprom */
2078 devpriv->command5_bits &=
2079 ~CALDAC_LOAD_BIT & ~EEPROM_EN_BIT & ~EEPROM_WRITE_UNPROTECT_BIT;
2081 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2083 /* write 4 bit channel */
2084 labpc_serial_out(dev, channel, 4);
2085 /* write 8 bit caldac value */
2086 labpc_serial_out(dev, value, 8);
2088 /* set and clear caldac bit to load caldac value */
2089 devpriv->command5_bits |= CALDAC_LOAD_BIT;
2091 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2092 devpriv->command5_bits &= ~CALDAC_LOAD_BIT;
2094 devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2097 static struct comedi_driver labpc_driver = {
2098 .driver_name = DRV_NAME,
2099 .module = THIS_MODULE,
2100 .attach = labpc_attach,
2101 .auto_attach = labpc_auto_attach,
2102 .detach = labpc_common_detach,
2103 .num_names = ARRAY_SIZE(labpc_boards),
2104 .board_name = &labpc_boards[0].name,
2105 .offset = sizeof(struct labpc_board_struct),
2108 #ifdef CONFIG_COMEDI_PCI_DRIVERS
2109 static DEFINE_PCI_DEVICE_TABLE(labpc_pci_table) = {
2110 {PCI_DEVICE(PCI_VENDOR_ID_NI, 0x161)},
2113 MODULE_DEVICE_TABLE(pci, labpc_pci_table);
2115 static int labpc_pci_probe(struct pci_dev *dev,
2116 const struct pci_device_id *ent)
2118 return comedi_pci_auto_config(dev, &labpc_driver);
2121 static struct pci_driver labpc_pci_driver = {
2123 .id_table = labpc_pci_table,
2124 .probe = labpc_pci_probe,
2125 .remove = comedi_pci_auto_unconfig,
2127 module_comedi_pci_driver(labpc_driver, labpc_pci_driver);
2129 module_comedi_driver(labpc_driver);
2133 MODULE_AUTHOR("Comedi http://www.comedi.org");
2134 MODULE_DESCRIPTION("Comedi low-level driver");
2135 MODULE_LICENSE("GPL");