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path: root/drivers/staging/comedi/drivers/dt2814.c
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Diffstat (limited to 'drivers/staging/comedi/drivers/dt2814.c')
-rw-r--r--drivers/staging/comedi/drivers/dt2814.c372
1 files changed, 0 insertions, 372 deletions
diff --git a/drivers/staging/comedi/drivers/dt2814.c b/drivers/staging/comedi/drivers/dt2814.c
deleted file mode 100644
index ed44ce0d151b..000000000000
--- a/drivers/staging/comedi/drivers/dt2814.c
+++ /dev/null
@@ -1,372 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * 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>
- */
-/*
- * 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 <linux/module.h>
-#include <linux/interrupt.h>
-#include "../comedidev.h"
-
-#include <linux/delay.h>
-
-#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
-
-#define DT2814_TIMEOUT 10
-#define DT2814_MAX_SPEED 100000 /* Arbitrary 10 khz limit */
-
-static int dt2814_ai_notbusy(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn,
- unsigned long context)
-{
- unsigned int status;
-
- status = inb(dev->iobase + DT2814_CSR);
- if (context)
- *(unsigned int *)context = status;
- if (status & DT2814_BUSY)
- return -EBUSY;
- return 0;
-}
-
-static int dt2814_ai_clear(struct comedi_device *dev)
-{
- unsigned int status = 0;
- int ret;
-
- /* Wait until not busy and get status register value. */
- ret = comedi_timeout(dev, NULL, NULL, dt2814_ai_notbusy,
- (unsigned long)&status);
- if (ret)
- return ret;
-
- if (status & (DT2814_FINISH | DT2814_ERR)) {
- /*
- * There unread data, or the error flag is set.
- * Read the data register twice to clear the condition.
- */
- inb(dev->iobase + DT2814_DATA);
- inb(dev->iobase + DT2814_DATA);
- }
- return 0;
-}
-
-static int dt2814_ai_eoc(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn,
- unsigned long context)
-{
- unsigned int status;
-
- status = inb(dev->iobase + DT2814_CSR);
- if (status & DT2814_FINISH)
- return 0;
- return -EBUSY;
-}
-
-static int dt2814_ai_insn_read(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn, unsigned int *data)
-{
- int n, hi, lo;
- int chan;
- int ret;
-
- dt2814_ai_clear(dev); /* clear stale data or error */
- for (n = 0; n < insn->n; n++) {
- chan = CR_CHAN(insn->chanspec);
-
- outb(chan, dev->iobase + DT2814_CSR);
-
- ret = comedi_timeout(dev, s, insn, dt2814_ai_eoc, 0);
- if (ret)
- return ret;
-
- 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;
- unsigned int arg;
-
- /* Step 1 : check if triggers are trivially valid */
-
- err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
- err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
- err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
- err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
- err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
-
- if (err)
- return 1;
-
- /* Step 2a : make sure trigger sources are unique */
-
- err |= comedi_check_trigger_is_unique(cmd->stop_src);
-
- /* Step 2b : and mutually compatible */
-
- if (err)
- return 2;
-
- /* Step 3: check if arguments are trivially valid */
-
- err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
-
- err |= comedi_check_trigger_arg_max(&cmd->scan_begin_arg, 1000000000);
- err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
- DT2814_MAX_SPEED);
-
- err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
- cmd->chanlist_len);
-
- if (cmd->stop_src == TRIG_COUNT)
- err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 2);
- else /* TRIG_NONE */
- err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
-
- if (err)
- return 3;
-
- /* step 4: fix up any arguments */
-
- arg = cmd->scan_begin_arg;
- dt2814_ns_to_timer(&arg, cmd->flags);
- err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
-
- 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;
-
- dt2814_ai_clear(dev); /* clear stale data or error */
- trigvar = dt2814_ns_to_timer(&cmd->scan_begin_arg, cmd->flags);
-
- chan = CR_CHAN(cmd->chanlist[0]);
-
- outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
-
- return 0;
-}
-
-static int dt2814_ai_cancel(struct comedi_device *dev,
- struct comedi_subdevice *s)
-{
- unsigned int status;
- unsigned long flags;
-
- spin_lock_irqsave(&dev->spinlock, flags);
- status = inb(dev->iobase + DT2814_CSR);
- if (status & DT2814_ENB) {
- /*
- * Clear the timed trigger enable bit.
- *
- * Note: turning off timed mode triggers another
- * sample. This will be mopped up by the calls to
- * dt2814_ai_clear().
- */
- outb(status & DT2814_CHANMASK, dev->iobase + DT2814_CSR);
- }
- spin_unlock_irqrestore(&dev->spinlock, flags);
- return 0;
-}
-
-static irqreturn_t dt2814_interrupt(int irq, void *d)
-{
- struct comedi_device *dev = d;
- struct comedi_subdevice *s = dev->read_subdev;
- struct comedi_async *async;
- unsigned int lo, hi;
- unsigned short data;
- unsigned int status;
-
- if (!dev->attached) {
- dev_err(dev->class_dev, "spurious interrupt\n");
- return IRQ_HANDLED;
- }
-
- async = s->async;
-
- spin_lock(&dev->spinlock);
-
- status = inb(dev->iobase + DT2814_CSR);
- if (!(status & DT2814_ENB)) {
- /* Timed acquisition not enabled. Nothing to do. */
- spin_unlock(&dev->spinlock);
- return IRQ_HANDLED;
- }
-
- if (!(status & (DT2814_FINISH | DT2814_ERR))) {
- /* Spurious interrupt? */
- spin_unlock(&dev->spinlock);
- return IRQ_HANDLED;
- }
-
- /* Read data or clear error. */
- hi = inb(dev->iobase + DT2814_DATA);
- lo = inb(dev->iobase + DT2814_DATA);
-
- data = (hi << 4) | (lo >> 4);
-
- if (status & DT2814_ERR) {
- async->events |= COMEDI_CB_ERROR;
- } else {
- comedi_buf_write_samples(s, &data, 1);
- if (async->cmd.stop_src == TRIG_COUNT &&
- async->scans_done >= async->cmd.stop_arg) {
- async->events |= COMEDI_CB_EOA;
- }
- }
- if (async->events & COMEDI_CB_CANCEL_MASK) {
- /*
- * Disable timed mode.
- *
- * Note: turning off timed mode triggers another
- * sample. This will be mopped up by the calls to
- * dt2814_ai_clear().
- */
- outb(status & DT2814_CHANMASK, dev->iobase + DT2814_CSR);
- }
-
- spin_unlock(&dev->spinlock);
-
- comedi_handle_events(dev, s);
- return IRQ_HANDLED;
-}
-
-static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it)
-{
- struct comedi_subdevice *s;
- int ret;
-
- ret = comedi_request_region(dev, it->options[0], 0x2);
- if (ret)
- return ret;
-
- outb(0, dev->iobase + DT2814_CSR);
- if (dt2814_ai_clear(dev)) {
- dev_err(dev->class_dev, "reset error (fatal)\n");
- return -EIO;
- }
-
- if (it->options[1]) {
- ret = request_irq(it->options[1], dt2814_interrupt, 0,
- dev->board_name, dev);
- if (ret == 0)
- dev->irq = it->options[1];
- }
-
- ret = comedi_alloc_subdevices(dev, 1);
- if (ret)
- return ret;
-
- s = &dev->subdevices[0];
- s->type = COMEDI_SUBD_AI;
- s->subdev_flags = SDF_READABLE | SDF_GROUND;
- s->n_chan = 16; /* XXX */
- s->insn_read = dt2814_ai_insn_read;
- s->maxdata = 0xfff;
- s->range_table = &range_unknown; /* XXX */
- if (dev->irq) {
- dev->read_subdev = s;
- s->subdev_flags |= SDF_CMD_READ;
- s->len_chanlist = 1;
- s->do_cmd = dt2814_ai_cmd;
- s->do_cmdtest = dt2814_ai_cmdtest;
- s->cancel = dt2814_ai_cancel;
- }
-
- return 0;
-}
-
-static void dt2814_detach(struct comedi_device *dev)
-{
- if (dev->irq) {
- /*
- * An extra conversion triggered on termination of an
- * asynchronous command may still be in progress. Wait for
- * it to finish and clear the data or error status.
- */
- dt2814_ai_clear(dev);
- }
- comedi_legacy_detach(dev);
-}
-
-static struct comedi_driver dt2814_driver = {
- .driver_name = "dt2814",
- .module = THIS_MODULE,
- .attach = dt2814_attach,
- .detach = dt2814_detach,
-};
-module_comedi_driver(dt2814_driver);
-
-MODULE_AUTHOR("Comedi https://www.comedi.org");
-MODULE_DESCRIPTION("Comedi low-level driver");
-MODULE_LICENSE("GPL");
generated by cgit (git 2.34.1) at 2024-06-12 16:41:12 +0000