diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/pcmad.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/pcmad.c | 197 |
1 files changed, 102 insertions, 95 deletions
diff --git a/drivers/staging/comedi/drivers/pcmad.c b/drivers/staging/comedi/drivers/pcmad.c index b7c932e152e0..d5c728dc6192 100644 --- a/drivers/staging/comedi/drivers/pcmad.c +++ b/drivers/staging/comedi/drivers/pcmad.c @@ -1,52 +1,44 @@ /* - comedi/drivers/pcmad.c - Hardware driver for Winsystems PCM-A/D12 and PCM-A/D16 - - COMEDI - Linux Control and Measurement Device Interface - Copyright (C) 2000,2001 David A. Schleef <ds@schleef.org> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * pcmad.c + * Hardware driver for Winsystems PCM-A/D12 and PCM-A/D16 + * + * COMEDI - Linux Control and Measurement Device Interface + * Copyright (C) 2000,2001 David A. Schleef <ds@schleef.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ -*/ /* -Driver: pcmad -Description: Winsystems PCM-A/D12, PCM-A/D16 -Author: ds -Devices: [Winsystems] PCM-A/D12 (pcmad12), PCM-A/D16 (pcmad16) -Status: untested - -This driver was written on a bet that I couldn't write a driver -in less than 2 hours. I won the bet, but never got paid. =( - -Configuration options: - [0] - I/O port base - [1] - unused - [2] - Analog input reference - 0 = single ended - 1 = differential - [3] - Analog input encoding (must match jumpers) - 0 = straight binary - 1 = two's complement -*/ - -#include <linux/interrupt.h> -#include "../comedidev.h" - -#include <linux/ioport.h> + * Driver: pcmad + * Description: Winsystems PCM-A/D12, PCM-A/D16 + * Devices: (Winsystems) PCM-A/D12 [pcmad12] + * (Winsystems) PCM-A/D16 [pcmad16] + * Author: ds + * Status: untested + * + * This driver was written on a bet that I couldn't write a driver + * in less than 2 hours. I won the bet, but never got paid. =( + * + * Configuration options: + * [0] - I/O port base + * [1] - IRQ (unused) + * [2] - Analog input reference (must match jumpers) + * 0 = single-ended (16 channels) + * 1 = differential (8 channels) + * [3] - Analog input encoding (must match jumpers) + * 0 = straight binary (0-5V input range) + * 1 = two's complement (+-10V input range) + */ -#define PCMAD_SIZE 4 +#include "../comedidev.h" #define PCMAD_STATUS 0 #define PCMAD_LSB 1 @@ -55,60 +47,82 @@ Configuration options: struct pcmad_board_struct { const char *name; - int n_ai_bits; + unsigned int ai_maxdata; }; -struct pcmad_priv_struct { - int differential; - int twos_comp; +static const struct pcmad_board_struct pcmad_boards[] = { + { + .name = "pcmad12", + .ai_maxdata = 0x0fff, + }, { + .name = "pcmad16", + .ai_maxdata = 0xffff, + }, }; #define TIMEOUT 100 +static int pcmad_ai_wait_for_eoc(struct comedi_device *dev, + int timeout) +{ + int i; + + for (i = 0; i < timeout; i++) { + if ((inb(dev->iobase + PCMAD_STATUS) & 0x3) == 0x3) + return 0; + } + return -ETIME; +} + +static bool pcmad_range_is_bipolar(struct comedi_subdevice *s, + unsigned int range) +{ + return s->range_table->range[range].min < 0; +} + static int pcmad_ai_insn_read(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) + struct comedi_insn *insn, + unsigned int *data) { - const struct pcmad_board_struct *board = comedi_board(dev); - struct pcmad_priv_struct *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int range = CR_RANGE(insn->chanspec); + unsigned int val; + int ret; int i; - int chan; - int n; - chan = CR_CHAN(insn->chanspec); - - for (n = 0; n < insn->n; n++) { + for (i = 0; i < insn->n; i++) { outb(chan, dev->iobase + PCMAD_CONVERT); - for (i = 0; i < TIMEOUT; i++) { - if ((inb(dev->iobase + PCMAD_STATUS) & 0x3) == 0x3) - break; + ret = pcmad_ai_wait_for_eoc(dev, TIMEOUT); + if (ret) + return ret; + + val = inb(dev->iobase + PCMAD_LSB) | + (inb(dev->iobase + PCMAD_MSB) << 8); + + /* data is shifted on the pcmad12, fix it */ + if (s->maxdata == 0x0fff) + val >>= 4; + + if (pcmad_range_is_bipolar(s, range)) { + /* munge the two's complement value */ + val ^= ((s->maxdata + 1) >> 1); } - data[n] = inb(dev->iobase + PCMAD_LSB); - data[n] |= (inb(dev->iobase + PCMAD_MSB) << 8); - if (devpriv->twos_comp) - data[n] ^= (1 << (board->n_ai_bits - 1)); + data[i] = val; } - return n; + return insn->n; } -/* - * options: - * 0 i/o base - * 1 unused - * 2 0=single ended 1=differential - * 3 0=straight binary 1=two's comp - */ static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it) { const struct pcmad_board_struct *board = comedi_board(dev); - struct pcmad_priv_struct *devpriv; struct comedi_subdevice *s; int ret; - ret = comedi_request_region(dev, it->options[0], PCMAD_SIZE); + ret = comedi_request_region(dev, it->options[0], 0x04); if (ret) return ret; @@ -116,32 +130,25 @@ static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it) if (ret) return ret; - devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL); - if (!devpriv) - return -ENOMEM; - dev->private = devpriv; - s = &dev->subdevices[0]; - s->type = COMEDI_SUBD_AI; - s->subdev_flags = SDF_READABLE | AREF_GROUND; - s->n_chan = 16; /* XXX */ - s->len_chanlist = 1; - s->insn_read = pcmad_ai_insn_read; - s->maxdata = (1 << board->n_ai_bits) - 1; - s->range_table = &range_unknown; + s->type = COMEDI_SUBD_AI; + if (it->options[1]) { + /* 8 differential channels */ + s->subdev_flags = SDF_READABLE | AREF_DIFF; + s->n_chan = 8; + } else { + /* 16 single-ended channels */ + s->subdev_flags = SDF_READABLE | AREF_GROUND; + s->n_chan = 16; + } + s->len_chanlist = 1; + s->maxdata = board->ai_maxdata; + s->range_table = it->options[2] ? &range_bipolar10 : &range_unipolar5; + s->insn_read = pcmad_ai_insn_read; return 0; } -static const struct pcmad_board_struct pcmad_boards[] = { - { - .name = "pcmad12", - .n_ai_bits = 12, - }, { - .name = "pcmad16", - .n_ai_bits = 16, - }, -}; static struct comedi_driver pcmad_driver = { .driver_name = "pcmad", .module = THIS_MODULE, |