diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/pcmda12.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/pcmda12.c | 245 |
1 files changed, 111 insertions, 134 deletions
diff --git a/drivers/staging/comedi/drivers/pcmda12.c b/drivers/staging/comedi/drivers/pcmda12.c index 61e7fd14a1e8..774a63dfe040 100644 --- a/drivers/staging/comedi/drivers/pcmda12.c +++ b/drivers/staging/comedi/drivers/pcmda12.c @@ -1,152 +1,130 @@ /* - comedi/drivers/pcmda12.c - Driver for Winsystems PC-104 based PCM-D/A-12 8-channel AO board. - - COMEDI - Linux Control and Measurement Device Interface - Copyright (C) 2006 Calin A. Culianu <calin@ajvar.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. -*/ + * pcmda12.c + * Driver for Winsystems PC-104 based PCM-D/A-12 8-channel AO board. + * + * COMEDI - Linux Control and Measurement Device Interface + * Copyright (C) 2006 Calin A. Culianu <calin@ajvar.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: pcmda12 -Description: A driver for the Winsystems PCM-D/A-12 -Devices: [Winsystems] PCM-D/A-12 (pcmda12) -Author: Calin Culianu <calin@ajvar.org> -Updated: Fri, 13 Jan 2006 12:01:01 -0500 -Status: works - -A driver for the relatively straightforward-to-program PCM-D/A-12. -This board doesn't support commands, and the only way to set its -analog output range is to jumper the board. As such, -comedi_data_write() ignores the range value specified. - -The board uses 16 consecutive I/O addresses starting at the I/O port -base address. Each address corresponds to the LSB then MSB of a -particular channel from 0-7. - -Note that the board is not ISA-PNP capable and thus -needs the I/O port comedi_config parameter. - -Note that passing a nonzero value as the second config option will -enable "simultaneous xfer" mode for this board, in which AO writes -will not take effect until a subsequent read of any AO channel. This -is so that one can speed up programming by preloading all AO registers -with values before simultaneously setting them to take effect with one -read command. - -Configuration Options: - [0] - I/O port base address - [1] - Do Simultaneous Xfer (see description) -*/ + * Driver: pcmda12 + * Description: A driver for the Winsystems PCM-D/A-12 + * Devices: (Winsystems) PCM-D/A-12 [pcmda12] + * Author: Calin Culianu <calin@ajvar.org> + * Updated: Fri, 13 Jan 2006 12:01:01 -0500 + * Status: works + * + * A driver for the relatively straightforward-to-program PCM-D/A-12. + * This board doesn't support commands, and the only way to set its + * analog output range is to jumper the board. As such, + * comedi_data_write() ignores the range value specified. + * + * The board uses 16 consecutive I/O addresses starting at the I/O port + * base address. Each address corresponds to the LSB then MSB of a + * particular channel from 0-7. + * + * Note that the board is not ISA-PNP capable and thus needs the I/O + * port comedi_config parameter. + * + * Note that passing a nonzero value as the second config option will + * enable "simultaneous xfer" mode for this board, in which AO writes + * will not take effect until a subsequent read of any AO channel. This + * is so that one can speed up programming by preloading all AO registers + * with values before simultaneously setting them to take effect with one + * read command. + * + * Configuration Options: + * [0] - I/O port base address + * [1] - Do Simultaneous Xfer (see description) + */ #include "../comedidev.h" -#define CHANS 8 -#define IOSIZE 16 -#define LSB(x) ((unsigned char)((x) & 0xff)) -#define MSB(x) ((unsigned char)((((unsigned short)(x))>>8) & 0xff)) -#define LSB_PORT(chan) (dev->iobase + (chan)*2) -#define MSB_PORT(chan) (LSB_PORT(chan)+1) -#define BITS 12 - -/* note these have no effect and are merely here for reference.. - these are configured by jumpering the board! */ +/* AI range is not configurable, it's set by jumpers on the board */ static const struct comedi_lrange pcmda12_ranges = { - 3, - { - UNI_RANGE(5), UNI_RANGE(10), BIP_RANGE(5) - } + 3, { + UNI_RANGE(5), + UNI_RANGE(10), + BIP_RANGE(5) + } }; struct pcmda12_private { - - unsigned int ao_readback[CHANS]; + unsigned int ao_readback[8]; int simultaneous_xfer_mode; }; -static void zero_chans(struct comedi_device *dev) -{ /* sets up an - ASIC chip to defaults */ - int i; - for (i = 0; i < CHANS; ++i) { -/* /\* do this as one instruction?? *\/ */ -/* outw(0, LSB_PORT(chan)); */ - outb(0, LSB_PORT(i)); - outb(0, MSB_PORT(i)); - } - inb(LSB_PORT(0)); /* update chans. */ -} - -static int ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) +static int pcmda12_ao_insn_write(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) { struct pcmda12_private *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int val = devpriv->ao_readback[chan]; + unsigned long ioreg = dev->iobase + (chan * 2); int i; - int chan = CR_CHAN(insn->chanspec); - /* Writing a list of values to an AO channel is probably not - * very useful, but that's how the interface is defined. */ for (i = 0; i < insn->n; ++i) { - -/* /\* do this as one instruction?? *\/ */ -/* outw(data[i], LSB_PORT(chan)); */ - - /* Need to do this as two instructions due to 8-bit bus?? */ - /* first, load the low byte */ - outb(LSB(data[i]), LSB_PORT(chan)); - /* next, write the high byte */ - outb(MSB(data[i]), MSB_PORT(chan)); - - /* save shadow register */ - devpriv->ao_readback[chan] = data[i]; - + val = data[i]; + outb(val & 0xff, ioreg); + outb((val >> 8) & 0xff, ioreg + 1); + + /* + * Initiate transfer if not in simultaneaous xfer + * mode by reading one of the AO registers. + */ if (!devpriv->simultaneous_xfer_mode) - inb(LSB_PORT(chan)); + inb(ioreg); } + devpriv->ao_readback[chan] = val; - /* return the number of samples written */ - return i; + return insn->n; } -/* AO subdevices should have a read insn as well as a write insn. - - Usually this means copying a value stored in devpriv->ao_readback. - However, since this driver supports simultaneous xfer then sometimes - this function actually accomplishes work. - - Simultaneaous xfer mode is accomplished by loading ALL the values - you want for AO in all the channels, then READing off one of the AO - registers to initiate the instantaneous simultaneous update of all - DAC outputs, which makes all AO channels update simultaneously. - This is useful for some control applications, I would imagine. -*/ -static int ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) +static int pcmda12_ao_insn_read(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) { struct pcmda12_private *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); int i; - int chan = CR_CHAN(insn->chanspec); - for (i = 0; i < insn->n; i++) { - if (devpriv->simultaneous_xfer_mode) - inb(LSB_PORT(chan)); - /* read back shadow register */ + /* + * Initiate simultaneaous xfer mode by reading one of the + * AO registers. All analog outputs will then be updated. + */ + if (devpriv->simultaneous_xfer_mode) + inb(dev->iobase); + + for (i = 0; i < insn->n; i++) data[i] = devpriv->ao_readback[chan]; - } - return i; + return insn->n; +} + +static void pcmda12_ao_reset(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + int i; + + for (i = 0; i < s->n_chan; ++i) { + outb(0, dev->iobase + (i * 2)); + outb(0, dev->iobase + (i * 2) + 1); + } + /* Initiate transfer by reading one of the AO registers. */ + inb(dev->iobase); } static int pcmda12_attach(struct comedi_device *dev, @@ -156,7 +134,7 @@ static int pcmda12_attach(struct comedi_device *dev, struct comedi_subdevice *s; int ret; - ret = comedi_request_region(dev, it->options[0], IOSIZE); + ret = comedi_request_region(dev, it->options[0], 0x10); if (ret) return ret; @@ -172,18 +150,17 @@ static int pcmda12_attach(struct comedi_device *dev, return ret; s = &dev->subdevices[0]; - s->private = NULL; - s->maxdata = (0x1 << BITS) - 1; - s->range_table = &pcmda12_ranges; - s->type = COMEDI_SUBD_AO; - s->subdev_flags = SDF_READABLE | SDF_WRITABLE; - s->n_chan = CHANS; - s->insn_write = &ao_winsn; - s->insn_read = &ao_rinsn; - - zero_chans(dev); /* clear out all the registers, basically */ - - return 1; + s->type = COMEDI_SUBD_AO; + s->subdev_flags = SDF_READABLE | SDF_WRITABLE; + s->n_chan = 8; + s->maxdata = 0x0fff; + s->range_table = &pcmda12_ranges; + s->insn_write = pcmda12_ao_insn_write; + s->insn_read = pcmda12_ao_insn_read; + + pcmda12_ao_reset(dev, s); + + return 0; } static struct comedi_driver pcmda12_driver = { |