diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/das6402.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/das6402.c | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/das6402.c b/drivers/staging/comedi/drivers/das6402.c new file mode 100644 index 000000000000..2a8ca0525104 --- /dev/null +++ b/drivers/staging/comedi/drivers/das6402.c @@ -0,0 +1,354 @@ +/* + Some comments on the code.. + + - it shouldn't be necessary to use outb_p(). + + - ignoreirq creates a race condition. It needs to be fixed. + + */ + +/* + comedi/drivers/das6402.c + An experimental driver for Computerboards' DAS6402 I/O card + + Copyright (C) 1999 Oystein Svendsen <svendsen@pvv.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. + + */ +/* +Driver: das6402 +Description: Keithley Metrabyte DAS6402 (& compatibles) +Author: Oystein Svendsen <svendsen@pvv.org> +Status: bitrotten +Devices: [Keithley Metrabyte] DAS6402 (das6402) + +This driver has suffered bitrot. +*/ + +#include "../comedidev.h" + +#include <linux/ioport.h> + +#define DAS6402_SIZE 16 + +#define N_WORDS 3000*64 + +#define STOP 0 +#define START 1 + +#define SCANL 0x3f00 +#define BYTE unsigned char +#define WORD unsigned short + +/*----- register 8 ----*/ +#define CLRINT 0x01 +#define CLRXTR 0x02 +#define CLRXIN 0x04 +#define EXTEND 0x10 +#define ARMED 0x20 /* enable conting of post sample conv */ +#define POSTMODE 0x40 +#define MHZ 0x80 /* 10 MHz clock */ +/*---------------------*/ + +/*----- register 9 ----*/ +#define IRQ (0x04 << 4) /* these two are */ +#define IRQV 10 /* dependent on each other */ + +#define CONVSRC 0x03 /* trig src is Intarnal pacer */ +#define BURSTEN 0x04 /* enable burst */ +#define XINTE 0x08 /* use external int. trig */ +#define INTE 0x80 /* enable analog interrupts */ +/*---------------------*/ + +/*----- register 10 ---*/ +#define TGEN 0x01 /* Use pin DI1 for externl trigging? */ +#define TGSEL 0x02 /* Use edge triggering */ +#define TGPOL 0x04 /* active edge is falling */ +#define PRETRIG 0x08 /* pretrig */ +/*---------------------*/ + +/*----- register 11 ---*/ +#define EOB 0x0c +#define FIFOHFULL 0x08 +#define GAIN 0x01 +#define FIFONEPTY 0x04 +#define MODE 0x10 +#define SEM 0x20 +#define BIP 0x40 +/*---------------------*/ + +#define M0 0x00 +#define M2 0x04 + +#define C0 0x00 +#define C1 0x40 +#define C2 0x80 +#define RWLH 0x30 + +static int das6402_attach(struct comedi_device * dev, struct comedi_devconfig * it); +static int das6402_detach(struct comedi_device * dev); +static struct comedi_driver driver_das6402 = { + driver_name:"das6402", + module:THIS_MODULE, + attach:das6402_attach, + detach:das6402_detach, +}; + +COMEDI_INITCLEANUP(driver_das6402); + +struct das6402_private { + int ai_bytes_to_read; + + int das6402_ignoreirq; +}; +#define devpriv ((struct das6402_private *)dev->private) + +static void das6402_ai_fifo_dregs(struct comedi_device * dev, struct comedi_subdevice * s); + +static void das6402_setcounter(struct comedi_device * dev) +{ + BYTE p; + unsigned short ctrlwrd; + + /* set up counter0 first, mode 0 */ + p = M0 | C0 | RWLH; + outb_p(p, dev->iobase + 15); + ctrlwrd = 2000; + p = (BYTE) (0xff & ctrlwrd); + outb_p(p, dev->iobase + 12); + p = (BYTE) (0xff & (ctrlwrd >> 8)); + outb_p(p, dev->iobase + 12); + + /* set up counter1, mode 2 */ + p = M2 | C1 | RWLH; + outb_p(p, dev->iobase + 15); + ctrlwrd = 10; + p = (BYTE) (0xff & ctrlwrd); + outb_p(p, dev->iobase + 13); + p = (BYTE) (0xff & (ctrlwrd >> 8)); + outb_p(p, dev->iobase + 13); + + /* set up counter1, mode 2 */ + p = M2 | C2 | RWLH; + outb_p(p, dev->iobase + 15); + ctrlwrd = 1000; + p = (BYTE) (0xff & ctrlwrd); + outb_p(p, dev->iobase + 14); + p = (BYTE) (0xff & (ctrlwrd >> 8)); + outb_p(p, dev->iobase + 14); +} + +static irqreturn_t intr_handler(int irq, void *d PT_REGS_ARG) +{ + struct comedi_device *dev = d; + struct comedi_subdevice *s = dev->subdevices; + + if (!dev->attached || devpriv->das6402_ignoreirq) { + printk("das6402: BUG: spurious interrupt\n"); + return IRQ_HANDLED; + } +#ifdef DEBUG + printk("das6402: interrupt! das6402_irqcount=%i\n", + devpriv->das6402_irqcount); + printk("das6402: iobase+2=%i\n", inw_p(dev->iobase + 2)); +#endif + + das6402_ai_fifo_dregs(dev, s); + + if (s->async->buf_write_count >= devpriv->ai_bytes_to_read) { + outw_p(SCANL, dev->iobase + 2); /* clears the fifo */ + outb(0x07, dev->iobase + 8); /* clears all flip-flops */ +#ifdef DEBUG + printk("das6402: Got %i samples\n\n", + devpriv->das6402_wordsread - diff); +#endif + s->async->events |= COMEDI_CB_EOA; + comedi_event(dev, s); + } + + outb(0x01, dev->iobase + 8); /* clear only the interrupt flip-flop */ + + comedi_event(dev, s); + return IRQ_HANDLED; +} + +#if 0 +static void das6402_ai_fifo_read(struct comedi_device * dev, short * data, int n) +{ + int i; + + for (i = 0; i < n; i++) + data[i] = inw(dev->iobase); +} +#endif + +static void das6402_ai_fifo_dregs(struct comedi_device * dev, struct comedi_subdevice * s) +{ + while (1) { + if (!(inb(dev->iobase + 8) & 0x01)) + return; + comedi_buf_put(s->async, inw(dev->iobase)); + } +} + +static int das6402_ai_cancel(struct comedi_device * dev, struct comedi_subdevice * s) +{ + /* + * This function should reset the board from whatever condition it + * is in (i.e., acquiring data), to a non-active state. + */ + + devpriv->das6402_ignoreirq = 1; +#ifdef DEBUG + printk("das6402: Stopping acquisition\n"); +#endif + devpriv->das6402_ignoreirq = 1; + outb_p(0x02, dev->iobase + 10); /* disable external trigging */ + outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */ + outb_p(0, dev->iobase + 9); /* disables interrupts */ + + outw_p(SCANL, dev->iobase + 2); + + return 0; +} + +#ifdef unused +static int das6402_ai_mode2(struct comedi_device * dev, struct comedi_subdevice * s, + comedi_trig * it) +{ + devpriv->das6402_ignoreirq = 1; + +#ifdef DEBUG + printk("das6402: Starting acquisition\n"); +#endif + outb_p(0x03, dev->iobase + 10); /* enable external trigging */ + outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */ + outb_p(IRQ | CONVSRC | BURSTEN | INTE, dev->iobase + 9); + + devpriv->ai_bytes_to_read = it->n * sizeof(short); + + /* um... ignoreirq is a nasty race condition */ + devpriv->das6402_ignoreirq = 0; + + outw_p(SCANL, dev->iobase + 2); + + return 0; +} +#endif + +static int board_init(struct comedi_device * dev) +{ + BYTE b; + + devpriv->das6402_ignoreirq = 1; + + outb(0x07, dev->iobase + 8); + + /* register 11 */ + outb_p(MODE, dev->iobase + 11); + b = BIP | SEM | MODE | GAIN | FIFOHFULL; + outb_p(b, dev->iobase + 11); + + /* register 8 */ + outb_p(EXTEND, dev->iobase + 8); + b = EXTEND | MHZ; + outb_p(b, dev->iobase + 8); + b = MHZ | CLRINT | CLRXTR | CLRXIN; + outb_p(b, dev->iobase + 8); + + /* register 9 */ + b = IRQ | CONVSRC | BURSTEN | INTE; + outb_p(b, dev->iobase + 9); + + /* register 10 */ + b = TGSEL | TGEN; + outb_p(b, dev->iobase + 10); + + b = 0x07; + outb_p(b, dev->iobase + 8); + + das6402_setcounter(dev); + + outw_p(SCANL, dev->iobase + 2); /* reset card fifo */ + + devpriv->das6402_ignoreirq = 0; + + return 0; +} + +static int das6402_detach(struct comedi_device * dev) +{ + if (dev->irq) + comedi_free_irq(dev->irq, dev); + if (dev->iobase) + release_region(dev->iobase, DAS6402_SIZE); + + return 0; +} + +static int das6402_attach(struct comedi_device * dev, struct comedi_devconfig * it) +{ + unsigned int irq; + unsigned long iobase; + int ret; + struct comedi_subdevice *s; + + dev->board_name = "das6402"; + + iobase = it->options[0]; + if (iobase == 0) + iobase = 0x300; + + printk("comedi%d: das6402: 0x%04lx", dev->minor, iobase); + + if (!request_region(iobase, DAS6402_SIZE, "das6402")) { + printk(" I/O port conflict\n"); + return -EIO; + } + dev->iobase = iobase; + + /* should do a probe here */ + + irq = it->options[0]; + printk(" ( irq = %u )", irq); + ret = comedi_request_irq(irq, intr_handler, 0, "das6402", dev); + if (ret < 0) { + printk("irq conflict\n"); + return ret; + } + dev->irq = irq; + + if ((ret = alloc_private(dev, sizeof(struct das6402_private))) < 0) + return ret; + + if ((ret = alloc_subdevices(dev, 1)) < 0) + return ret; + + /* ai subdevice */ + s = dev->subdevices + 0; + s->type = COMEDI_SUBD_AI; + s->subdev_flags = SDF_READABLE | SDF_GROUND; + s->n_chan = 8; + //s->trig[2]=das6402_ai_mode2; + s->cancel = das6402_ai_cancel; + s->maxdata = (1 << 12) - 1; + s->len_chanlist = 16; /* ? */ + s->range_table = &range_unknown; + + board_init(dev); + + return 0; +} |