--- /dev/null
+/*
+ comedi/drivers/dt2814.c
+ Hardware driver for Data Translation DT2814
+
+ COMEDI - Linux Control and Measurement Device Interface
+ Copyright (C) 1998 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.
+
+*/
+/*
+Driver: dt2814
+Description: Data Translation DT2814
+Author: ds
+Status: complete
+Devices: [Data Translation] DT2814 (dt2814)
+
+Configuration options:
+ [0] - I/O port base address
+ [1] - IRQ
+
+This card has 16 analog inputs multiplexed onto a 12 bit ADC. There
+is a minimally useful onboard clock. The base frequency for the
+clock is selected by jumpers, and the clock divider can be selected
+via programmed I/O. Unfortunately, the clock divider can only be
+a power of 10, from 1 to 10^7, of which only 3 or 4 are useful. In
+addition, the clock does not seem to be very accurate.
+*/
+
+#include "../comedidev.h"
+
+#include <linux/ioport.h>
+#include <linux/delay.h>
+
+#define DT2814_SIZE 2
+
+#define DT2814_CSR 0
+#define DT2814_DATA 1
+
+/*
+ * flags
+ */
+
+#define DT2814_FINISH 0x80
+#define DT2814_ERR 0x40
+#define DT2814_BUSY 0x20
+#define DT2814_ENB 0x10
+#define DT2814_CHANMASK 0x0f
+
+static int dt2814_attach(struct comedi_device * dev, struct comedi_devconfig * it);
+static int dt2814_detach(struct comedi_device * dev);
+static struct comedi_driver driver_dt2814 = {
+ driver_name:"dt2814",
+ module:THIS_MODULE,
+ attach:dt2814_attach,
+ detach:dt2814_detach,
+};
+
+COMEDI_INITCLEANUP(driver_dt2814);
+
+static irqreturn_t dt2814_interrupt(int irq, void *dev PT_REGS_ARG);
+
+struct dt2814_private {
+
+ int ntrig;
+ int curadchan;
+};
+
+#define devpriv ((struct dt2814_private *)dev->private)
+
+#define DT2814_TIMEOUT 10
+#define DT2814_MAX_SPEED 100000 /* Arbitrary 10 khz limit */
+
+static int dt2814_ai_insn_read(struct comedi_device * dev, struct comedi_subdevice * s,
+ struct comedi_insn * insn, unsigned int * data)
+{
+ int n, i, hi, lo;
+ int chan;
+ int status = 0;
+
+ for (n = 0; n < insn->n; n++) {
+ chan = CR_CHAN(insn->chanspec);
+
+ outb(chan, dev->iobase + DT2814_CSR);
+ for (i = 0; i < DT2814_TIMEOUT; i++) {
+ status = inb(dev->iobase + DT2814_CSR);
+ printk("dt2814: status: %02x\n", status);
+ comedi_udelay(10);
+ if (status & DT2814_FINISH)
+ break;
+ }
+ if (i >= DT2814_TIMEOUT) {
+ printk("dt2814: status: %02x\n", status);
+ return -ETIMEDOUT;
+ }
+
+ hi = inb(dev->iobase + DT2814_DATA);
+ lo = inb(dev->iobase + DT2814_DATA);
+
+ data[n] = (hi << 4) | (lo >> 4);
+ }
+
+ return n;
+}
+
+static int dt2814_ns_to_timer(unsigned int *ns, unsigned int flags)
+{
+ int i;
+ unsigned int f;
+
+ /* XXX ignores flags */
+
+ f = 10000; /* ns */
+ for (i = 0; i < 8; i++) {
+ if ((2 * (*ns)) < (f * 11))
+ break;
+ f *= 10;
+ }
+
+ *ns = f;
+
+ return i;
+}
+
+static int dt2814_ai_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s,
+ struct comedi_cmd * cmd)
+{
+ int err = 0;
+ int tmp;
+
+ /* step 1: make sure trigger sources are trivially valid */
+
+ tmp = cmd->start_src;
+ cmd->start_src &= TRIG_NOW;
+ if (!cmd->start_src || tmp != cmd->start_src)
+ err++;
+
+ tmp = cmd->scan_begin_src;
+ cmd->scan_begin_src &= TRIG_TIMER;
+ if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
+ err++;
+
+ tmp = cmd->convert_src;
+ cmd->convert_src &= TRIG_NOW;
+ if (!cmd->convert_src || tmp != cmd->convert_src)
+ err++;
+
+ tmp = cmd->scan_end_src;
+ cmd->scan_end_src &= TRIG_COUNT;
+ if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
+ err++;
+
+ tmp = cmd->stop_src;
+ cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
+ if (!cmd->stop_src || tmp != cmd->stop_src)
+ err++;
+
+ if (err)
+ return 1;
+
+ /* step 2: make sure trigger sources are unique and mutually compatible */
+
+ /* note that mutual compatiblity is not an issue here */
+ if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
+ err++;
+
+ if (err)
+ return 2;
+
+ /* step 3: make sure arguments are trivially compatible */
+
+ if (cmd->start_arg != 0) {
+ cmd->start_arg = 0;
+ err++;
+ }
+ if (cmd->scan_begin_arg > 1000000000) {
+ cmd->scan_begin_arg = 1000000000;
+ err++;
+ }
+ if (cmd->scan_begin_arg < DT2814_MAX_SPEED) {
+ cmd->scan_begin_arg = DT2814_MAX_SPEED;
+ err++;
+ }
+ if (cmd->scan_end_arg != cmd->chanlist_len) {
+ cmd->scan_end_arg = cmd->chanlist_len;
+ err++;
+ }
+ if (cmd->stop_src == TRIG_COUNT) {
+ if (cmd->stop_arg < 2) {
+ cmd->stop_arg = 2;
+ err++;
+ }
+ } else {
+ /* TRIG_NONE */
+ if (cmd->stop_arg != 0) {
+ cmd->stop_arg = 0;
+ err++;
+ }
+ }
+
+ if (err)
+ return 3;
+
+ /* step 4: fix up any arguments */
+
+ tmp = cmd->scan_begin_arg;
+ dt2814_ns_to_timer(&cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK);
+ if (tmp != cmd->scan_begin_arg)
+ err++;
+
+ if (err)
+ return 4;
+
+ return 0;
+}
+
+static int dt2814_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
+{
+ struct comedi_cmd *cmd = &s->async->cmd;
+ int chan;
+ int trigvar;
+
+ trigvar =
+ dt2814_ns_to_timer(&cmd->scan_begin_arg,
+ cmd->flags & TRIG_ROUND_MASK);
+
+ chan = CR_CHAN(cmd->chanlist[0]);
+
+ devpriv->ntrig = cmd->stop_arg;
+ outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
+
+ return 0;
+
+}
+
+static int dt2814_attach(struct comedi_device * dev, struct comedi_devconfig * it)
+{
+ int i, irq;
+ int ret;
+ struct comedi_subdevice *s;
+ unsigned long iobase;
+
+ iobase = it->options[0];
+ printk("comedi%d: dt2814: 0x%04lx ", dev->minor, iobase);
+ if (!request_region(iobase, DT2814_SIZE, "dt2814")) {
+ printk("I/O port conflict\n");
+ return -EIO;
+ }
+ dev->iobase = iobase;
+ dev->board_name = "dt2814";
+
+ outb(0, dev->iobase + DT2814_CSR);
+ comedi_udelay(100);
+ if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
+ printk("reset error (fatal)\n");
+ return -EIO;
+ }
+ i = inb(dev->iobase + DT2814_DATA);
+ i = inb(dev->iobase + DT2814_DATA);
+
+ irq = it->options[1];
+#if 0
+ if (irq < 0) {
+ save_flags(flags);
+ sti();
+ irqs = probe_irq_on();
+
+ outb(0, dev->iobase + DT2814_CSR);
+
+ comedi_udelay(100);
+
+ irq = probe_irq_off(irqs);
+ restore_flags(flags);
+ if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
+ printk("error probing irq (bad) \n");
+ }
+
+ i = inb(dev->iobase + DT2814_DATA);
+ i = inb(dev->iobase + DT2814_DATA);
+ }
+#endif
+ dev->irq = 0;
+ if (irq > 0) {
+ if (comedi_request_irq(irq, dt2814_interrupt, 0, "dt2814", dev)) {
+ printk("(irq %d unavailable)\n", irq);
+ } else {
+ printk("( irq = %d )\n", irq);
+ dev->irq = irq;
+ }
+ } else if (irq == 0) {
+ printk("(no irq)\n");
+ } else {
+#if 0
+ printk("(probe returned multiple irqs--bad)\n");
+#else
+ printk("(irq probe not implemented)\n");
+#endif
+ }
+
+ if ((ret = alloc_subdevices(dev, 1)) < 0)
+ return ret;
+ if ((ret = alloc_private(dev, sizeof(struct dt2814_private))) < 0)
+ return ret;
+
+ s = dev->subdevices + 0;
+ dev->read_subdev = s;
+ s->type = COMEDI_SUBD_AI;
+ s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
+ s->n_chan = 16; /* XXX */
+ s->len_chanlist = 1;
+ s->insn_read = dt2814_ai_insn_read;
+ s->do_cmd = dt2814_ai_cmd;
+ s->do_cmdtest = dt2814_ai_cmdtest;
+ s->maxdata = 0xfff;
+ s->range_table = &range_unknown; /* XXX */
+
+ return 0;
+}
+
+static int dt2814_detach(struct comedi_device * dev)
+{
+ printk("comedi%d: dt2814: remove\n", dev->minor);
+
+ if (dev->irq) {
+ comedi_free_irq(dev->irq, dev);
+ }
+ if (dev->iobase) {
+ release_region(dev->iobase, DT2814_SIZE);
+ }
+
+ return 0;
+}
+
+static irqreturn_t dt2814_interrupt(int irq, void *d PT_REGS_ARG)
+{
+ int lo, hi;
+ struct comedi_device *dev = d;
+ struct comedi_subdevice *s;
+ int data;
+
+ if (!dev->attached) {
+ comedi_error(dev, "spurious interrupt");
+ return IRQ_HANDLED;
+ }
+
+ s = dev->subdevices + 0;
+
+ hi = inb(dev->iobase + DT2814_DATA);
+ lo = inb(dev->iobase + DT2814_DATA);
+
+ data = (hi << 4) | (lo >> 4);
+
+ if (!(--devpriv->ntrig)) {
+ int i;
+
+ outb(0, dev->iobase + DT2814_CSR);
+ /* note: turning off timed mode triggers another
+ sample. */
+
+ for (i = 0; i < DT2814_TIMEOUT; i++) {
+ if (inb(dev->iobase + DT2814_CSR) & DT2814_FINISH)
+ break;
+ }
+ inb(dev->iobase + DT2814_DATA);
+ inb(dev->iobase + DT2814_DATA);
+
+ s->async->events |= COMEDI_CB_EOA;
+ }
+ comedi_event(dev, s);
+ return IRQ_HANDLED;
+}
projects / linux-2.6-omap-h63xx.git / blobdiff