--- /dev/null
+/*
+ * dt282x.c
+ * Comedi driver for Data Translation DT2821 series
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 1997-8 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: dt282x
+ * Description: Data Translation DT2821 series (including DT-EZ)
+ * Author: ds
+ * Devices: [Data Translation] DT2821 (dt2821), DT2821-F-16SE (dt2821-f),
+ * DT2821-F-8DI (dt2821-f), DT2821-G-16SE (dt2821-g),
+ * DT2821-G-8DI (dt2821-g), DT2823 (dt2823), DT2824-PGH (dt2824-pgh),
+ * DT2824-PGL (dt2824-pgl), DT2825 (dt2825), DT2827 (dt2827),
+ * DT2828 (dt2828), DT2928 (dt2829), DT21-EZ (dt21-ez), DT23-EZ (dt23-ez),
+ * DT24-EZ (dt24-ez), DT24-EZ-PGL (dt24-ez-pgl)
+ * Status: complete
+ * Updated: Wed, 22 Aug 2001 17:11:34 -0700
+ *
+ * Configuration options:
+ * [0] - I/O port base address
+ * [1] - IRQ (optional, required for async command support)
+ * [2] - DMA 1 (optional, required for async command support)
+ * [3] - DMA 2 (optional, required for async command support)
+ * [4] - AI jumpered for 0=single ended, 1=differential
+ * [5] - AI jumpered for 0=straight binary, 1=2's complement
+ * [6] - AO 0 data format (deprecated, see below)
+ * [7] - AO 1 data format (deprecated, see below)
+ * [8] - AI jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5]
+ * [9] - AO channel 0 range (deprecated, see below)
+ * [10]- AO channel 1 range (deprecated, see below)
+ *
+ * Notes:
+ * - AO commands might be broken.
+ * - If you try to run a command on both the AI and AO subdevices
+ * simultaneously, bad things will happen. The driver needs to
+ * be fixed to check for this situation and return an error.
+ * - AO range is not programmable. The AO subdevice has a range_table
+ * containing all the possible analog output ranges. Use the range
+ * that matches your board configuration to convert between data
+ * values and physical units. The format of the data written to the
+ * board is handled automatically based on the unipolar/bipolar
+ * range that is selected.
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/gfp.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+
+#include "../comedidev.h"
+
+#include "comedi_isadma.h"
+
+/*
+ * Register map
+ */
+#define DT2821_ADCSR_REG 0x00
+#define DT2821_ADCSR_ADERR (1 << 15)
+#define DT2821_ADCSR_ADCLK (1 << 9)
+#define DT2821_ADCSR_MUXBUSY (1 << 8)
+#define DT2821_ADCSR_ADDONE (1 << 7)
+#define DT2821_ADCSR_IADDONE (1 << 6)
+#define DT2821_ADCSR_GS(x) (((x) & 0x3) << 4)
+#define DT2821_ADCSR_CHAN(x) (((x) & 0xf) << 0)
+#define DT2821_CHANCSR_REG 0x02
+#define DT2821_CHANCSR_LLE (1 << 15)
+#define DT2821_CHANCSR_PRESLA(x) (((x) & 0xf) >> 8)
+#define DT2821_CHANCSR_NUMB(x) ((((x) - 1) & 0xf) << 0)
+#define DT2821_ADDAT_REG 0x04
+#define DT2821_DACSR_REG 0x06
+#define DT2821_DACSR_DAERR (1 << 15)
+#define DT2821_DACSR_YSEL(x) ((x) << 9)
+#define DT2821_DACSR_SSEL (1 << 8)
+#define DT2821_DACSR_DACRDY (1 << 7)
+#define DT2821_DACSR_IDARDY (1 << 6)
+#define DT2821_DACSR_DACLK (1 << 5)
+#define DT2821_DACSR_HBOE (1 << 1)
+#define DT2821_DACSR_LBOE (1 << 0)
+#define DT2821_DADAT_REG 0x08
+#define DT2821_DIODAT_REG 0x0a
+#define DT2821_SUPCSR_REG 0x0c
+#define DT2821_SUPCSR_DMAD (1 << 15)
+#define DT2821_SUPCSR_ERRINTEN (1 << 14)
+#define DT2821_SUPCSR_CLRDMADNE (1 << 13)
+#define DT2821_SUPCSR_DDMA (1 << 12)
+#define DT2821_SUPCSR_DS_PIO (0 << 10)
+#define DT2821_SUPCSR_DS_AD_CLK (1 << 10)
+#define DT2821_SUPCSR_DS_DA_CLK (2 << 10)
+#define DT2821_SUPCSR_DS_AD_TRIG (3 << 10)
+#define DT2821_SUPCSR_BUFFB (1 << 9)
+#define DT2821_SUPCSR_SCDN (1 << 8)
+#define DT2821_SUPCSR_DACON (1 << 7)
+#define DT2821_SUPCSR_ADCINIT (1 << 6)
+#define DT2821_SUPCSR_DACINIT (1 << 5)
+#define DT2821_SUPCSR_PRLD (1 << 4)
+#define DT2821_SUPCSR_STRIG (1 << 3)
+#define DT2821_SUPCSR_XTRIG (1 << 2)
+#define DT2821_SUPCSR_XCLK (1 << 1)
+#define DT2821_SUPCSR_BDINIT (1 << 0)
+#define DT2821_TMRCTR_REG 0x0e
+
+static const struct comedi_lrange range_dt282x_ai_lo_bipolar = {
+ 4, {
+ BIP_RANGE(10),
+ BIP_RANGE(5),
+ BIP_RANGE(2.5),
+ BIP_RANGE(1.25)
+ }
+};
+
+static const struct comedi_lrange range_dt282x_ai_lo_unipolar = {
+ 4, {
+ UNI_RANGE(10),
+ UNI_RANGE(5),
+ UNI_RANGE(2.5),
+ UNI_RANGE(1.25)
+ }
+};
+
+static const struct comedi_lrange range_dt282x_ai_5_bipolar = {
+ 4, {
+ BIP_RANGE(5),
+ BIP_RANGE(2.5),
+ BIP_RANGE(1.25),
+ BIP_RANGE(0.625)
+ }
+};
+
+static const struct comedi_lrange range_dt282x_ai_5_unipolar = {
+ 4, {
+ UNI_RANGE(5),
+ UNI_RANGE(2.5),
+ UNI_RANGE(1.25),
+ UNI_RANGE(0.625)
+ }
+};
+
+static const struct comedi_lrange range_dt282x_ai_hi_bipolar = {
+ 4, {
+ BIP_RANGE(10),
+ BIP_RANGE(1),
+ BIP_RANGE(0.1),
+ BIP_RANGE(0.02)
+ }
+};
+
+static const struct comedi_lrange range_dt282x_ai_hi_unipolar = {
+ 4, {
+ UNI_RANGE(10),
+ UNI_RANGE(1),
+ UNI_RANGE(0.1),
+ UNI_RANGE(0.02)
+ }
+};
+
+/*
+ * The Analog Output range is set per-channel using jumpers on the board.
+ * All of these ranges may not be available on some DT2821 series boards.
+ * The default jumper setting has both channels set for +/-10V output.
+ */
+static const struct comedi_lrange dt282x_ao_range = {
+ 5, {
+ BIP_RANGE(10),
+ BIP_RANGE(5),
+ BIP_RANGE(2.5),
+ UNI_RANGE(10),
+ UNI_RANGE(5),
+ }
+};
+
+struct dt282x_board {
+ const char *name;
+ unsigned int ai_maxdata;
+ int adchan_se;
+ int adchan_di;
+ int ai_speed;
+ int ispgl;
+ int dachan;
+ unsigned int ao_maxdata;
+};
+
+static const struct dt282x_board boardtypes[] = {
+ {
+ .name = "dt2821",
+ .ai_maxdata = 0x0fff,
+ .adchan_se = 16,
+ .adchan_di = 8,
+ .ai_speed = 20000,
+ .dachan = 2,
+ .ao_maxdata = 0x0fff,
+ }, {
+ .name = "dt2821-f",
+ .ai_maxdata = 0x0fff,
+ .adchan_se = 16,
+ .adchan_di = 8,
+ .ai_speed = 6500,
+ .dachan = 2,
+ .ao_maxdata = 0x0fff,
+ }, {
+ .name = "dt2821-g",
+ .ai_maxdata = 0x0fff,
+ .adchan_se = 16,
+ .adchan_di = 8,
+ .ai_speed = 4000,
+ .dachan = 2,
+ .ao_maxdata = 0x0fff,
+ }, {
+ .name = "dt2823",
+ .ai_maxdata = 0xffff,
+ .adchan_di = 4,
+ .ai_speed = 10000,
+ .dachan = 2,
+ .ao_maxdata = 0xffff,
+ }, {
+ .name = "dt2824-pgh",
+ .ai_maxdata = 0x0fff,
+ .adchan_se = 16,
+ .adchan_di = 8,
+ .ai_speed = 20000,
+ }, {
+ .name = "dt2824-pgl",
+ .ai_maxdata = 0x0fff,
+ .adchan_se = 16,
+ .adchan_di = 8,
+ .ai_speed = 20000,
+ .ispgl = 1,
+ }, {
+ .name = "dt2825",
+ .ai_maxdata = 0x0fff,
+ .adchan_se = 16,
+ .adchan_di = 8,
+ .ai_speed = 20000,
+ .ispgl = 1,
+ .dachan = 2,
+ .ao_maxdata = 0x0fff,
+ }, {
+ .name = "dt2827",
+ .ai_maxdata = 0xffff,
+ .adchan_di = 4,
+ .ai_speed = 10000,
+ .dachan = 2,
+ .ao_maxdata = 0x0fff,
+ }, {
+ .name = "dt2828",
+ .ai_maxdata = 0x0fff,
+ .adchan_se = 4,
+ .ai_speed = 10000,
+ .dachan = 2,
+ .ao_maxdata = 0x0fff,
+ }, {
+ .name = "dt2829",
+ .ai_maxdata = 0xffff,
+ .adchan_se = 8,
+ .ai_speed = 33250,
+ .dachan = 2,
+ .ao_maxdata = 0xffff,
+ }, {
+ .name = "dt21-ez",
+ .ai_maxdata = 0x0fff,
+ .adchan_se = 16,
+ .adchan_di = 8,
+ .ai_speed = 10000,
+ .dachan = 2,
+ .ao_maxdata = 0x0fff,
+ }, {
+ .name = "dt23-ez",
+ .ai_maxdata = 0xffff,
+ .adchan_se = 16,
+ .adchan_di = 8,
+ .ai_speed = 10000,
+ }, {
+ .name = "dt24-ez",
+ .ai_maxdata = 0x0fff,
+ .adchan_se = 16,
+ .adchan_di = 8,
+ .ai_speed = 10000,
+ }, {
+ .name = "dt24-ez-pgl",
+ .ai_maxdata = 0x0fff,
+ .adchan_se = 16,
+ .adchan_di = 8,
+ .ai_speed = 10000,
+ .ispgl = 1,
+ },
+};
+
+struct dt282x_private {
+ struct comedi_isadma *dma;
+ unsigned int ad_2scomp:1;
+ unsigned int divisor;
+ int dacsr; /* software copies of registers */
+ int adcsr;
+ int supcsr;
+ int ntrig;
+ int nread;
+ int dma_dir;
+};
+
+static int dt282x_prep_ai_dma(struct comedi_device *dev, int dma_index, int n)
+{
+ struct dt282x_private *devpriv = dev->private;
+ struct comedi_isadma *dma = devpriv->dma;
+ struct comedi_isadma_desc *desc = &dma->desc[dma_index];
+
+ if (!devpriv->ntrig)
+ return 0;
+
+ if (n == 0)
+ n = desc->maxsize;
+ if (n > devpriv->ntrig * 2)
+ n = devpriv->ntrig * 2;
+ devpriv->ntrig -= n / 2;
+
+ desc->size = n;
+ comedi_isadma_set_mode(desc, devpriv->dma_dir);
+
+ comedi_isadma_program(desc);
+
+ return n;
+}
+
+static int dt282x_prep_ao_dma(struct comedi_device *dev, int dma_index, int n)
+{
+ struct dt282x_private *devpriv = dev->private;
+ struct comedi_isadma *dma = devpriv->dma;
+ struct comedi_isadma_desc *desc = &dma->desc[dma_index];
+
+ desc->size = n;
+ comedi_isadma_set_mode(desc, devpriv->dma_dir);
+
+ comedi_isadma_program(desc);
+
+ return n;
+}
+
+static void dt282x_disable_dma(struct comedi_device *dev)
+{
+ struct dt282x_private *devpriv = dev->private;
+ struct comedi_isadma *dma = devpriv->dma;
+ struct comedi_isadma_desc *desc;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ desc = &dma->desc[i];
+ comedi_isadma_disable(desc->chan);
+ }
+}
+
+static unsigned int dt282x_ns_to_timer(unsigned int *ns, unsigned int flags)
+{
+ unsigned int prescale, base, divider;
+
+ for (prescale = 0; prescale < 16; prescale++) {
+ if (prescale == 1)
+ continue;
+ base = 250 * (1 << prescale);
+ switch (flags & CMDF_ROUND_MASK) {
+ case CMDF_ROUND_NEAREST:
+ default:
+ divider = (*ns + base / 2) / base;
+ break;
+ case CMDF_ROUND_DOWN:
+ divider = (*ns) / base;
+ break;
+ case CMDF_ROUND_UP:
+ divider = (*ns + base - 1) / base;
+ break;
+ }
+ if (divider < 256) {
+ *ns = divider * base;
+ return (prescale << 8) | (255 - divider);
+ }
+ }
+ base = 250 * (1 << 15);
+ divider = 255;
+ *ns = divider * base;
+ return (15 << 8) | (255 - divider);
+}
+
+static void dt282x_munge(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ unsigned short *buf,
+ unsigned int nbytes)
+{
+ struct dt282x_private *devpriv = dev->private;
+ unsigned int val;
+ int i;
+
+ if (nbytes % 2)
+ dev_err(dev->class_dev,
+ "bug! odd number of bytes from dma xfer\n");
+
+ for (i = 0; i < nbytes / 2; i++) {
+ val = buf[i];
+ val &= s->maxdata;
+ if (devpriv->ad_2scomp)
+ val = comedi_offset_munge(s, val);
+
+ buf[i] = val;
+ }
+}
+
+static unsigned int dt282x_ao_setup_dma(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ int cur_dma)
+{
+ struct dt282x_private *devpriv = dev->private;
+ struct comedi_isadma *dma = devpriv->dma;
+ struct comedi_isadma_desc *desc = &dma->desc[cur_dma];
+ unsigned int nsamples = comedi_bytes_to_samples(s, desc->maxsize);
+ unsigned int nbytes;
+
+ nbytes = comedi_buf_read_samples(s, desc->virt_addr, nsamples);
+ if (nbytes)
+ dt282x_prep_ao_dma(dev, cur_dma, nbytes);
+ else
+ dev_err(dev->class_dev, "AO underrun\n");
+
+ return nbytes;
+}
+
+static void dt282x_ao_dma_interrupt(struct comedi_device *dev,
+ struct comedi_subdevice *s)
+{
+ struct dt282x_private *devpriv = dev->private;
+ struct comedi_isadma *dma = devpriv->dma;
+ struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
+
+ outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
+ dev->iobase + DT2821_SUPCSR_REG);
+
+ comedi_isadma_disable(desc->chan);
+
+ if (!dt282x_ao_setup_dma(dev, s, dma->cur_dma))
+ s->async->events |= COMEDI_CB_OVERFLOW;
+
+ dma->cur_dma = 1 - dma->cur_dma;
+}
+
+static void dt282x_ai_dma_interrupt(struct comedi_device *dev,
+ struct comedi_subdevice *s)
+{
+ struct dt282x_private *devpriv = dev->private;
+ struct comedi_isadma *dma = devpriv->dma;
+ struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
+ unsigned int nsamples = comedi_bytes_to_samples(s, desc->size);
+ int ret;
+
+ outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
+ dev->iobase + DT2821_SUPCSR_REG);
+
+ comedi_isadma_disable(desc->chan);
+
+ dt282x_munge(dev, s, desc->virt_addr, desc->size);
+ ret = comedi_buf_write_samples(s, desc->virt_addr, nsamples);
+ if (ret != desc->size)
+ return;
+
+ devpriv->nread -= nsamples;
+ if (devpriv->nread < 0) {
+ dev_info(dev->class_dev, "nread off by one\n");
+ devpriv->nread = 0;
+ }
+ if (!devpriv->nread) {
+ s->async->events |= COMEDI_CB_EOA;
+ return;
+ }
+#if 0
+ /* clear the dual dma flag, making this the last dma segment */
+ /* XXX probably wrong */
+ if (!devpriv->ntrig) {
+ devpriv->supcsr &= ~DT2821_SUPCSR_DDMA;
+ outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
+ }
+#endif
+ /* restart the channel */
+ dt282x_prep_ai_dma(dev, dma->cur_dma, 0);
+
+ dma->cur_dma = 1 - dma->cur_dma;
+}
+
+static irqreturn_t dt282x_interrupt(int irq, void *d)
+{
+ struct comedi_device *dev = d;
+ struct dt282x_private *devpriv = dev->private;
+ struct comedi_subdevice *s = dev->read_subdev;
+ struct comedi_subdevice *s_ao = dev->write_subdev;
+ unsigned int supcsr, adcsr, dacsr;
+ int handled = 0;
+
+ if (!dev->attached) {
+ dev_err(dev->class_dev, "spurious interrupt\n");
+ return IRQ_HANDLED;
+ }
+
+ adcsr = inw(dev->iobase + DT2821_ADCSR_REG);
+ dacsr = inw(dev->iobase + DT2821_DACSR_REG);
+ supcsr = inw(dev->iobase + DT2821_SUPCSR_REG);
+ if (supcsr & DT2821_SUPCSR_DMAD) {
+ if (devpriv->dma_dir == COMEDI_ISADMA_READ)
+ dt282x_ai_dma_interrupt(dev, s);
+ else
+ dt282x_ao_dma_interrupt(dev, s_ao);
+ handled = 1;
+ }
+ if (adcsr & DT2821_ADCSR_ADERR) {
+ if (devpriv->nread != 0) {
+ dev_err(dev->class_dev, "A/D error\n");
+ s->async->events |= COMEDI_CB_ERROR;
+ }
+ handled = 1;
+ }
+ if (dacsr & DT2821_DACSR_DAERR) {
+ dev_err(dev->class_dev, "D/A error\n");
+ s_ao->async->events |= COMEDI_CB_ERROR;
+ handled = 1;
+ }
+#if 0
+ if (adcsr & DT2821_ADCSR_ADDONE) {
+ unsigned short data;
+
+ data = inw(dev->iobase + DT2821_ADDAT_REG);
+ data &= s->maxdata;
+ if (devpriv->ad_2scomp)
+ data = comedi_offset_munge(s, data);
+
+ comedi_buf_write_samples(s, &data, 1);
+
+ devpriv->nread--;
+ if (!devpriv->nread) {
+ s->async->events |= COMEDI_CB_EOA;
+ } else {
+ if (supcsr & DT2821_SUPCSR_SCDN)
+ outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
+ dev->iobase + DT2821_SUPCSR_REG);
+ }
+ handled = 1;
+ }
+#endif
+ comedi_handle_events(dev, s);
+ comedi_handle_events(dev, s_ao);
+
+ return IRQ_RETVAL(handled);
+}
+
+static void dt282x_load_changain(struct comedi_device *dev, int n,
+ unsigned int *chanlist)
+{
+ struct dt282x_private *devpriv = dev->private;
+ int i;
+
+ outw(DT2821_CHANCSR_LLE | DT2821_CHANCSR_NUMB(n),
+ dev->iobase + DT2821_CHANCSR_REG);
+ for (i = 0; i < n; i++) {
+ unsigned int chan = CR_CHAN(chanlist[i]);
+ unsigned int range = CR_RANGE(chanlist[i]);
+
+ outw(devpriv->adcsr |
+ DT2821_ADCSR_GS(range) |
+ DT2821_ADCSR_CHAN(chan),
+ dev->iobase + DT2821_ADCSR_REG);
+ }
+ outw(DT2821_CHANCSR_NUMB(n), dev->iobase + DT2821_CHANCSR_REG);
+}
+
+static int dt282x_ai_timeout(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned long context)
+{
+ unsigned int status;
+
+ status = inw(dev->iobase + DT2821_ADCSR_REG);
+ switch (context) {
+ case DT2821_ADCSR_MUXBUSY:
+ if ((status & DT2821_ADCSR_MUXBUSY) == 0)
+ return 0;
+ break;
+ case DT2821_ADCSR_ADDONE:
+ if (status & DT2821_ADCSR_ADDONE)
+ return 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return -EBUSY;
+}
+
+/*
+ * Performs a single A/D conversion.
+ * - Put channel/gain into channel-gain list
+ * - preload multiplexer
+ * - trigger conversion and wait for it to finish
+ */
+static int dt282x_ai_insn_read(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
+{
+ struct dt282x_private *devpriv = dev->private;
+ unsigned int val;
+ int ret;
+ int i;
+
+ /* XXX should we really be enabling the ad clock here? */
+ devpriv->adcsr = DT2821_ADCSR_ADCLK;
+ outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
+
+ dt282x_load_changain(dev, 1, &insn->chanspec);
+
+ outw(devpriv->supcsr | DT2821_SUPCSR_PRLD,
+ dev->iobase + DT2821_SUPCSR_REG);
+ ret = comedi_timeout(dev, s, insn,
+ dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < insn->n; i++) {
+ outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
+ dev->iobase + DT2821_SUPCSR_REG);
+
+ ret = comedi_timeout(dev, s, insn,
+ dt282x_ai_timeout, DT2821_ADCSR_ADDONE);
+ if (ret)
+ return ret;
+
+ val = inw(dev->iobase + DT2821_ADDAT_REG);
+ val &= s->maxdata;
+ if (devpriv->ad_2scomp)
+ val = comedi_offset_munge(s, val);
+
+ data[i] = val;
+ }
+
+ return i;
+}
+
+static int dt282x_ai_cmdtest(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_cmd *cmd)
+{
+ const struct dt282x_board *board = dev->board_ptr;
+ struct dt282x_private *devpriv = dev->private;
+ 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_FOLLOW | TRIG_EXT);
+ err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_TIMER);
+ 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->scan_begin_src);
+ 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_is(&cmd->scan_begin_arg, 0);
+
+ err |= comedi_check_trigger_arg_min(&cmd->convert_arg, 4000);
+
+#define SLOWEST_TIMER (250*(1<<15)*255)
+ err |= comedi_check_trigger_arg_max(&cmd->convert_arg, SLOWEST_TIMER);
+ err |= comedi_check_trigger_arg_min(&cmd->convert_arg, board->ai_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, 1);
+ else /* TRIG_EXT | TRIG_NONE */
+ err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
+
+ if (err)
+ return 3;
+
+ /* step 4: fix up any arguments */
+
+ arg = cmd->convert_arg;
+ devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags);
+ err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
+
+ if (err)
+ return 4;
+
+ return 0;
+}
+
+static int dt282x_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
+{
+ struct dt282x_private *devpriv = dev->private;
+ struct comedi_isadma *dma = devpriv->dma;
+ struct comedi_cmd *cmd = &s->async->cmd;
+ int ret;
+
+ dt282x_disable_dma(dev);
+
+ outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
+
+ devpriv->supcsr = DT2821_SUPCSR_ERRINTEN;
+ if (cmd->scan_begin_src == TRIG_FOLLOW)
+ devpriv->supcsr = DT2821_SUPCSR_DS_AD_CLK;
+ else
+ devpriv->supcsr = DT2821_SUPCSR_DS_AD_TRIG;
+ outw(devpriv->supcsr |
+ DT2821_SUPCSR_CLRDMADNE |
+ DT2821_SUPCSR_BUFFB |
+ DT2821_SUPCSR_ADCINIT,
+ dev->iobase + DT2821_SUPCSR_REG);
+
+ devpriv->ntrig = cmd->stop_arg * cmd->scan_end_arg;
+ devpriv->nread = devpriv->ntrig;
+
+ devpriv->dma_dir = COMEDI_ISADMA_READ;
+ dma->cur_dma = 0;
+ dt282x_prep_ai_dma(dev, 0, 0);
+ if (devpriv->ntrig) {
+ dt282x_prep_ai_dma(dev, 1, 0);
+ devpriv->supcsr |= DT2821_SUPCSR_DDMA;
+ outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
+ }
+
+ devpriv->adcsr = 0;
+
+ dt282x_load_changain(dev, cmd->chanlist_len, cmd->chanlist);
+
+ devpriv->adcsr = DT2821_ADCSR_ADCLK | DT2821_ADCSR_IADDONE;
+ outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
+
+ outw(devpriv->supcsr | DT2821_SUPCSR_PRLD,
+ dev->iobase + DT2821_SUPCSR_REG);
+ ret = comedi_timeout(dev, s, NULL,
+ dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY);
+ if (ret)
+ return ret;
+
+ if (cmd->scan_begin_src == TRIG_FOLLOW) {
+ outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
+ dev->iobase + DT2821_SUPCSR_REG);
+ } else {
+ devpriv->supcsr |= DT2821_SUPCSR_XTRIG;
+ outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
+ }
+
+ return 0;
+}
+
+static int dt282x_ai_cancel(struct comedi_device *dev,
+ struct comedi_subdevice *s)
+{
+ struct dt282x_private *devpriv = dev->private;
+
+ dt282x_disable_dma(dev);
+
+ devpriv->adcsr = 0;
+ outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
+
+ devpriv->supcsr = 0;
+ outw(devpriv->supcsr | DT2821_SUPCSR_ADCINIT,
+ dev->iobase + DT2821_SUPCSR_REG);
+
+ return 0;
+}
+
+static int dt282x_ao_insn_write(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
+{
+ struct dt282x_private *devpriv = dev->private;
+ unsigned int chan = CR_CHAN(insn->chanspec);
+ unsigned int range = CR_RANGE(insn->chanspec);
+ int i;
+
+ devpriv->dacsr |= DT2821_DACSR_SSEL | DT2821_DACSR_YSEL(chan);
+
+ for (i = 0; i < insn->n; i++) {
+ unsigned int val = data[i];
+
+ s->readback[chan] = val;
+
+ if (comedi_range_is_bipolar(s, range))
+ val = comedi_offset_munge(s, val);
+
+ outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
+
+ outw(val, dev->iobase + DT2821_DADAT_REG);
+
+ outw(devpriv->supcsr | DT2821_SUPCSR_DACON,
+ dev->iobase + DT2821_SUPCSR_REG);
+ }
+
+ return insn->n;
+}
+
+static int dt282x_ao_cmdtest(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_cmd *cmd)
+{
+ struct dt282x_private *devpriv = dev->private;
+ int err = 0;
+ unsigned int arg;
+
+ /* Step 1 : check if triggers are trivially valid */
+
+ err |= comedi_check_trigger_src(&cmd->start_src, TRIG_INT);
+ 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_min(&cmd->scan_begin_arg, 5000);
+ err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
+ 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, 1);
+ else /* TRIG_EXT | 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;
+ devpriv->divisor = dt282x_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 dt282x_ao_inttrig(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ unsigned int trig_num)
+{
+ struct dt282x_private *devpriv = dev->private;
+ struct comedi_cmd *cmd = &s->async->cmd;
+
+ if (trig_num != cmd->start_src)
+ return -EINVAL;
+
+ if (!dt282x_ao_setup_dma(dev, s, 0))
+ return -EPIPE;
+
+ if (!dt282x_ao_setup_dma(dev, s, 1))
+ return -EPIPE;
+
+ outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
+ dev->iobase + DT2821_SUPCSR_REG);
+ s->async->inttrig = NULL;
+
+ return 1;
+}
+
+static int dt282x_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
+{
+ struct dt282x_private *devpriv = dev->private;
+ struct comedi_isadma *dma = devpriv->dma;
+ struct comedi_cmd *cmd = &s->async->cmd;
+
+ dt282x_disable_dma(dev);
+
+ devpriv->supcsr = DT2821_SUPCSR_ERRINTEN |
+ DT2821_SUPCSR_DS_DA_CLK |
+ DT2821_SUPCSR_DDMA;
+ outw(devpriv->supcsr |
+ DT2821_SUPCSR_CLRDMADNE |
+ DT2821_SUPCSR_BUFFB |
+ DT2821_SUPCSR_DACINIT,
+ dev->iobase + DT2821_SUPCSR_REG);
+
+ devpriv->ntrig = cmd->stop_arg * cmd->chanlist_len;
+ devpriv->nread = devpriv->ntrig;
+
+ devpriv->dma_dir = COMEDI_ISADMA_WRITE;
+ dma->cur_dma = 0;
+
+ outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
+
+ /* clear all bits but the DIO direction bits */
+ devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
+
+ devpriv->dacsr |= (DT2821_DACSR_SSEL |
+ DT2821_DACSR_DACLK |
+ DT2821_DACSR_IDARDY);
+ outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
+
+ s->async->inttrig = dt282x_ao_inttrig;
+
+ return 0;
+}
+
+static int dt282x_ao_cancel(struct comedi_device *dev,
+ struct comedi_subdevice *s)
+{
+ struct dt282x_private *devpriv = dev->private;
+
+ dt282x_disable_dma(dev);
+
+ /* clear all bits but the DIO direction bits */
+ devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
+
+ outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
+
+ devpriv->supcsr = 0;
+ outw(devpriv->supcsr | DT2821_SUPCSR_DACINIT,
+ dev->iobase + DT2821_SUPCSR_REG);
+
+ return 0;
+}
+
+static int dt282x_dio_insn_bits(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
+{
+ if (comedi_dio_update_state(s, data))
+ outw(s->state, dev->iobase + DT2821_DIODAT_REG);
+
+ data[1] = inw(dev->iobase + DT2821_DIODAT_REG);
+
+ return insn->n;
+}
+
+static int dt282x_dio_insn_config(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
+{
+ struct dt282x_private *devpriv = dev->private;
+ unsigned int chan = CR_CHAN(insn->chanspec);
+ unsigned int mask;
+ int ret;
+
+ if (chan < 8)
+ mask = 0x00ff;
+ else
+ mask = 0xff00;
+
+ ret = comedi_dio_insn_config(dev, s, insn, data, mask);
+ if (ret)
+ return ret;
+
+ devpriv->dacsr &= ~(DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
+ if (s->io_bits & 0x00ff)
+ devpriv->dacsr |= DT2821_DACSR_LBOE;
+ if (s->io_bits & 0xff00)
+ devpriv->dacsr |= DT2821_DACSR_HBOE;
+
+ outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
+
+ return insn->n;
+}
+
+static const struct comedi_lrange *const ai_range_table[] = {
+ &range_dt282x_ai_lo_bipolar,
+ &range_dt282x_ai_lo_unipolar,
+ &range_dt282x_ai_5_bipolar,
+ &range_dt282x_ai_5_unipolar
+};
+
+static const struct comedi_lrange *const ai_range_pgl_table[] = {
+ &range_dt282x_ai_hi_bipolar,
+ &range_dt282x_ai_hi_unipolar
+};
+
+static const struct comedi_lrange *opt_ai_range_lkup(int ispgl, int x)
+{
+ if (ispgl) {
+ if (x < 0 || x >= 2)
+ x = 0;
+ return ai_range_pgl_table[x];
+ }
+
+ if (x < 0 || x >= 4)
+ x = 0;
+ return ai_range_table[x];
+}
+
+static void dt282x_alloc_dma(struct comedi_device *dev,
+ struct comedi_devconfig *it)
+{
+ struct dt282x_private *devpriv = dev->private;
+ unsigned int irq_num = it->options[1];
+ unsigned int dma_chan[2];
+
+ if (it->options[2] < it->options[3]) {
+ dma_chan[0] = it->options[2];
+ dma_chan[1] = it->options[3];
+ } else {
+ dma_chan[0] = it->options[3];
+ dma_chan[1] = it->options[2];
+ }
+
+ if (!irq_num || dma_chan[0] == dma_chan[1] ||
+ dma_chan[0] < 5 || dma_chan[0] > 7 ||
+ dma_chan[1] < 5 || dma_chan[1] > 7)
+ return;
+
+ if (request_irq(irq_num, dt282x_interrupt, 0, dev->board_name, dev))
+ return;
+
+ /* DMA uses two 4K buffers with separate DMA channels */
+ devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan[0], dma_chan[1],
+ PAGE_SIZE, 0);
+ if (!devpriv->dma)
+ free_irq(irq_num, dev);
+}
+
+static void dt282x_free_dma(struct comedi_device *dev)
+{
+ struct dt282x_private *devpriv = dev->private;
+
+ if (devpriv)
+ comedi_isadma_free(devpriv->dma);
+}
+
+static int dt282x_initialize(struct comedi_device *dev)
+{
+ /* Initialize board */
+ outw(DT2821_SUPCSR_BDINIT, dev->iobase + DT2821_SUPCSR_REG);
+ inw(dev->iobase + DT2821_ADCSR_REG);
+
+ /*
+ * At power up, some registers are in a well-known state.
+ * Check them to see if a DT2821 series board is present.
+ */
+ if (((inw(dev->iobase + DT2821_ADCSR_REG) & 0xfff0) != 0x7c00) ||
+ ((inw(dev->iobase + DT2821_CHANCSR_REG) & 0xf0f0) != 0x70f0) ||
+ ((inw(dev->iobase + DT2821_DACSR_REG) & 0x7c93) != 0x7c90) ||
+ ((inw(dev->iobase + DT2821_SUPCSR_REG) & 0xf8ff) != 0x0000) ||
+ ((inw(dev->iobase + DT2821_TMRCTR_REG) & 0xff00) != 0xf000)) {
+ dev_err(dev->class_dev, "board not found\n");
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ options:
+ 0 i/o base
+ 1 irq
+ 2 dma1
+ 3 dma2
+ 4 0=single ended, 1=differential
+ 5 ai 0=straight binary, 1=2's comp
+ 6 ao0 0=straight binary, 1=2's comp
+ 7 ao1 0=straight binary, 1=2's comp
+ 8 ai 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V
+ 9 ao0 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V, 4=±2.5 V
+ 10 ao1 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V, 4=±2.5 V
+ */
+static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
+{
+ const struct dt282x_board *board = dev->board_ptr;
+ struct dt282x_private *devpriv;
+ struct comedi_subdevice *s;
+ int ret;
+
+ ret = comedi_request_region(dev, it->options[0], 0x10);
+ if (ret)
+ return ret;
+
+ ret = dt282x_initialize(dev);
+ if (ret)
+ return ret;
+
+ devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
+ if (!devpriv)
+ return -ENOMEM;
+
+ /* an IRQ and 2 DMA channels are required for async command support */
+ dt282x_alloc_dma(dev, it);
+
+ ret = comedi_alloc_subdevices(dev, 3);
+ if (ret)
+ return ret;
+
+ /* Analog Input subdevice */
+ s = &dev->subdevices[0];
+ s->type = COMEDI_SUBD_AI;
+ s->subdev_flags = SDF_READABLE;
+ if ((it->options[4] && board->adchan_di) || board->adchan_se == 0) {
+ s->subdev_flags |= SDF_DIFF;
+ s->n_chan = board->adchan_di;
+ } else {
+ s->subdev_flags |= SDF_COMMON;
+ s->n_chan = board->adchan_se;
+ }
+ s->maxdata = board->ai_maxdata;
+
+ s->range_table = opt_ai_range_lkup(board->ispgl, it->options[8]);
+ devpriv->ad_2scomp = it->options[5] ? 1 : 0;
+
+ s->insn_read = dt282x_ai_insn_read;
+ if (dev->irq) {
+ dev->read_subdev = s;
+ s->subdev_flags |= SDF_CMD_READ;
+ s->len_chanlist = s->n_chan;
+ s->do_cmdtest = dt282x_ai_cmdtest;
+ s->do_cmd = dt282x_ai_cmd;
+ s->cancel = dt282x_ai_cancel;
+ }
+
+ /* Analog Output subdevice */
+ s = &dev->subdevices[1];
+ if (board->dachan) {
+ s->type = COMEDI_SUBD_AO;
+ s->subdev_flags = SDF_WRITABLE;
+ s->n_chan = board->dachan;
+ s->maxdata = board->ao_maxdata;
+ /* ranges are per-channel, set by jumpers on the board */
+ s->range_table = &dt282x_ao_range;
+ s->insn_write = dt282x_ao_insn_write;
+ if (dev->irq) {
+ dev->write_subdev = s;
+ s->subdev_flags |= SDF_CMD_WRITE;
+ s->len_chanlist = s->n_chan;
+ s->do_cmdtest = dt282x_ao_cmdtest;
+ s->do_cmd = dt282x_ao_cmd;
+ s->cancel = dt282x_ao_cancel;
+ }
+
+ ret = comedi_alloc_subdev_readback(s);
+ if (ret)
+ return ret;
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
+ /* Digital I/O subdevice */
+ s = &dev->subdevices[2];
+ s->type = COMEDI_SUBD_DIO;
+ s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
+ s->n_chan = 16;
+ s->maxdata = 1;
+ s->range_table = &range_digital;
+ s->insn_bits = dt282x_dio_insn_bits;
+ s->insn_config = dt282x_dio_insn_config;
+
+ return 0;
+}
+
+static void dt282x_detach(struct comedi_device *dev)
+{
+ dt282x_free_dma(dev);
+ comedi_legacy_detach(dev);
+}
+
+static struct comedi_driver dt282x_driver = {
+ .driver_name = "dt282x",
+ .module = THIS_MODULE,
+ .attach = dt282x_attach,
+ .detach = dt282x_detach,
+ .board_name = &boardtypes[0].name,
+ .num_names = ARRAY_SIZE(boardtypes),
+ .offset = sizeof(struct dt282x_board),
+};
+module_comedi_driver(dt282x_driver);
+
+MODULE_AUTHOR("Comedi http://www.comedi.org");
+MODULE_DESCRIPTION("Comedi driver for Data Translation DT2821 series");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff