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path: root/drivers/comedi/drivers/das08.c
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Diffstat (limited to 'drivers/comedi/drivers/das08.c')
-rw-r--r--drivers/comedi/drivers/das08.c470
1 files changed, 470 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/das08.c b/drivers/comedi/drivers/das08.c
new file mode 100644
index 000000000000..b50743c5b822
--- /dev/null
+++ b/drivers/comedi/drivers/das08.c
@@ -0,0 +1,470 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * comedi/drivers/das08.c
+ * comedi module for common DAS08 support (used by ISA/PCI/PCMCIA drivers)
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
+ * Copyright (C) 2001,2002,2003 Frank Mori Hess <fmhess@users.sourceforge.net>
+ * Copyright (C) 2004 Salvador E. Tropea <set@users.sf.net> <set@ieee.org>
+ */
+
+#include <linux/module.h>
+
+#include "../comedidev.h"
+
+#include "8255.h"
+#include "comedi_8254.h"
+#include "das08.h"
+
+/*
+ * Data format of DAS08_AI_LSB_REG and DAS08_AI_MSB_REG depends on
+ * 'ai_encoding' member of board structure:
+ *
+ * das08_encode12 : DATA[11..4] = MSB[7..0], DATA[3..0] = LSB[7..4].
+ * das08_pcm_encode12 : DATA[11..8] = MSB[3..0], DATA[7..9] = LSB[7..0].
+ * das08_encode16 : SIGN = MSB[7], MAGNITUDE[14..8] = MSB[6..0],
+ * MAGNITUDE[7..0] = LSB[7..0].
+ * SIGN==0 for negative input, SIGN==1 for positive input.
+ * Note: when read a second time after conversion
+ * complete, MSB[7] is an "over-range" bit.
+ */
+#define DAS08_AI_LSB_REG 0x00 /* (R) AI least significant bits */
+#define DAS08_AI_MSB_REG 0x01 /* (R) AI most significant bits */
+#define DAS08_AI_TRIG_REG 0x01 /* (W) AI software trigger */
+#define DAS08_STATUS_REG 0x02 /* (R) status */
+#define DAS08_STATUS_AI_BUSY BIT(7) /* AI conversion in progress */
+/*
+ * The IRQ status bit is set to 1 by a rising edge on the external interrupt
+ * input (which may be jumpered to the pacer output). It is cleared by
+ * setting the INTE control bit to 0. Not present on "JR" boards.
+ */
+#define DAS08_STATUS_IRQ BIT(3) /* latched interrupt input */
+/* digital inputs (not "JR" boards) */
+#define DAS08_STATUS_DI(x) (((x) & 0x70) >> 4)
+#define DAS08_CONTROL_REG 0x02 /* (W) control */
+/*
+ * Note: The AI multiplexor channel can also be read from status register using
+ * the same mask.
+ */
+#define DAS08_CONTROL_MUX_MASK 0x7 /* multiplexor channel mask */
+#define DAS08_CONTROL_MUX(x) ((x) & DAS08_CONTROL_MUX_MASK) /* mux channel */
+#define DAS08_CONTROL_INTE BIT(3) /* interrupt enable (not "JR" boards) */
+#define DAS08_CONTROL_DO_MASK 0xf0 /* digital outputs mask (not "JR") */
+/* digital outputs (not "JR" boards) */
+#define DAS08_CONTROL_DO(x) (((x) << 4) & DAS08_CONTROL_DO_MASK)
+/*
+ * (R/W) programmable AI gain ("PGx" and "AOx" boards):
+ * + bits 3..0 (R/W) show/set the gain for the current AI mux channel
+ * + bits 6..4 (R) show the current AI mux channel
+ * + bit 7 (R) not unused
+ */
+#define DAS08_GAIN_REG 0x03
+
+#define DAS08JR_DI_REG 0x03 /* (R) digital inputs ("JR" boards) */
+#define DAS08JR_DO_REG 0x03 /* (W) digital outputs ("JR" boards) */
+/* (W) analog output l.s.b. registers for 2 channels ("JR" boards) */
+#define DAS08JR_AO_LSB_REG(x) ((x) ? 0x06 : 0x04)
+/* (W) analog output m.s.b. registers for 2 channels ("JR" boards) */
+#define DAS08JR_AO_MSB_REG(x) ((x) ? 0x07 : 0x05)
+/*
+ * (R) update analog outputs ("JR" boards set for simultaneous output)
+ * (same register as digital inputs)
+ */
+#define DAS08JR_AO_UPDATE_REG 0x03
+
+/* (W) analog output l.s.b. registers for 2 channels ("AOx" boards) */
+#define DAS08AOX_AO_LSB_REG(x) ((x) ? 0x0a : 0x08)
+/* (W) analog output m.s.b. registers for 2 channels ("AOx" boards) */
+#define DAS08AOX_AO_MSB_REG(x) ((x) ? 0x0b : 0x09)
+/*
+ * (R) update analog outputs ("AOx" boards set for simultaneous output)
+ * (any of the analog output registers could be used for this)
+ */
+#define DAS08AOX_AO_UPDATE_REG 0x08
+
+/* gainlist same as _pgx_ below */
+
+static const struct comedi_lrange das08_pgl_ai_range = {
+ 9, {
+ BIP_RANGE(10),
+ BIP_RANGE(5),
+ BIP_RANGE(2.5),
+ BIP_RANGE(1.25),
+ BIP_RANGE(0.625),
+ UNI_RANGE(10),
+ UNI_RANGE(5),
+ UNI_RANGE(2.5),
+ UNI_RANGE(1.25)
+ }
+};
+
+static const struct comedi_lrange das08_pgh_ai_range = {
+ 12, {
+ BIP_RANGE(10),
+ BIP_RANGE(5),
+ BIP_RANGE(1),
+ BIP_RANGE(0.5),
+ BIP_RANGE(0.1),
+ BIP_RANGE(0.05),
+ BIP_RANGE(0.01),
+ BIP_RANGE(0.005),
+ UNI_RANGE(10),
+ UNI_RANGE(1),
+ UNI_RANGE(0.1),
+ UNI_RANGE(0.01)
+ }
+};
+
+static const struct comedi_lrange das08_pgm_ai_range = {
+ 9, {
+ BIP_RANGE(10),
+ BIP_RANGE(5),
+ BIP_RANGE(0.5),
+ BIP_RANGE(0.05),
+ BIP_RANGE(0.01),
+ UNI_RANGE(10),
+ UNI_RANGE(1),
+ UNI_RANGE(0.1),
+ UNI_RANGE(0.01)
+ }
+};
+
+static const struct comedi_lrange *const das08_ai_lranges[] = {
+ [das08_pg_none] = &range_unknown,
+ [das08_bipolar5] = &range_bipolar5,
+ [das08_pgh] = &das08_pgh_ai_range,
+ [das08_pgl] = &das08_pgl_ai_range,
+ [das08_pgm] = &das08_pgm_ai_range,
+};
+
+static const int das08_pgh_ai_gainlist[] = {
+ 8, 0, 10, 2, 12, 4, 14, 6, 1, 3, 5, 7
+};
+static const int das08_pgl_ai_gainlist[] = { 8, 0, 2, 4, 6, 1, 3, 5, 7 };
+static const int das08_pgm_ai_gainlist[] = { 8, 0, 10, 12, 14, 9, 11, 13, 15 };
+
+static const int *const das08_ai_gainlists[] = {
+ [das08_pg_none] = NULL,
+ [das08_bipolar5] = NULL,
+ [das08_pgh] = das08_pgh_ai_gainlist,
+ [das08_pgl] = das08_pgl_ai_gainlist,
+ [das08_pgm] = das08_pgm_ai_gainlist,
+};
+
+static int das08_ai_eoc(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned long context)
+{
+ unsigned int status;
+
+ status = inb(dev->iobase + DAS08_STATUS_REG);
+ if ((status & DAS08_STATUS_AI_BUSY) == 0)
+ return 0;
+ return -EBUSY;
+}
+
+static int das08_ai_insn_read(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ const struct das08_board_struct *board = dev->board_ptr;
+ struct das08_private_struct *devpriv = dev->private;
+ int n;
+ int chan;
+ int range;
+ int lsb, msb;
+ int ret;
+
+ chan = CR_CHAN(insn->chanspec);
+ range = CR_RANGE(insn->chanspec);
+
+ /* clear crap */
+ inb(dev->iobase + DAS08_AI_LSB_REG);
+ inb(dev->iobase + DAS08_AI_MSB_REG);
+
+ /* set multiplexer */
+ /* lock to prevent race with digital output */
+ spin_lock(&dev->spinlock);
+ devpriv->do_mux_bits &= ~DAS08_CONTROL_MUX_MASK;
+ devpriv->do_mux_bits |= DAS08_CONTROL_MUX(chan);
+ outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
+ spin_unlock(&dev->spinlock);
+
+ if (devpriv->pg_gainlist) {
+ /* set gain/range */
+ range = CR_RANGE(insn->chanspec);
+ outb(devpriv->pg_gainlist[range],
+ dev->iobase + DAS08_GAIN_REG);
+ }
+
+ for (n = 0; n < insn->n; n++) {
+ /* clear over-range bits for 16-bit boards */
+ if (board->ai_nbits == 16)
+ if (inb(dev->iobase + DAS08_AI_MSB_REG) & 0x80)
+ dev_info(dev->class_dev, "over-range\n");
+
+ /* trigger conversion */
+ outb_p(0, dev->iobase + DAS08_AI_TRIG_REG);
+
+ ret = comedi_timeout(dev, s, insn, das08_ai_eoc, 0);
+ if (ret)
+ return ret;
+
+ msb = inb(dev->iobase + DAS08_AI_MSB_REG);
+ lsb = inb(dev->iobase + DAS08_AI_LSB_REG);
+ if (board->ai_encoding == das08_encode12) {
+ data[n] = (lsb >> 4) | (msb << 4);
+ } else if (board->ai_encoding == das08_pcm_encode12) {
+ data[n] = (msb << 8) + lsb;
+ } else if (board->ai_encoding == das08_encode16) {
+ /*
+ * "JR" 16-bit boards are sign-magnitude.
+ *
+ * XXX The manual seems to imply that 0 is full-scale
+ * negative and 65535 is full-scale positive, but the
+ * original COMEDI patch to add support for the
+ * DAS08/JR/16 and DAS08/JR/16-AO boards have it
+ * encoded as sign-magnitude. Assume the original
+ * COMEDI code is correct for now.
+ */
+ unsigned int magnitude = lsb | ((msb & 0x7f) << 8);
+
+ /*
+ * MSB bit 7 is 0 for negative, 1 for positive voltage.
+ * COMEDI 16-bit bipolar data value for 0V is 0x8000.
+ */
+ if (msb & 0x80)
+ data[n] = BIT(15) + magnitude;
+ else
+ data[n] = BIT(15) - magnitude;
+ } else {
+ dev_err(dev->class_dev, "bug! unknown ai encoding\n");
+ return -1;
+ }
+ }
+
+ return n;
+}
+
+static int das08_di_insn_bits(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ data[0] = 0;
+ data[1] = DAS08_STATUS_DI(inb(dev->iobase + DAS08_STATUS_REG));
+
+ return insn->n;
+}
+
+static int das08_do_insn_bits(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ struct das08_private_struct *devpriv = dev->private;
+
+ if (comedi_dio_update_state(s, data)) {
+ /* prevent race with setting of analog input mux */
+ spin_lock(&dev->spinlock);
+ devpriv->do_mux_bits &= ~DAS08_CONTROL_DO_MASK;
+ devpriv->do_mux_bits |= DAS08_CONTROL_DO(s->state);
+ outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
+ spin_unlock(&dev->spinlock);
+ }
+
+ data[1] = s->state;
+
+ return insn->n;
+}
+
+static int das08jr_di_insn_bits(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ data[0] = 0;
+ data[1] = inb(dev->iobase + DAS08JR_DI_REG);
+
+ return insn->n;
+}
+
+static int das08jr_do_insn_bits(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ if (comedi_dio_update_state(s, data))
+ outb(s->state, dev->iobase + DAS08JR_DO_REG);
+
+ data[1] = s->state;
+
+ return insn->n;
+}
+
+static void das08_ao_set_data(struct comedi_device *dev,
+ unsigned int chan, unsigned int data)
+{
+ const struct das08_board_struct *board = dev->board_ptr;
+ unsigned char lsb;
+ unsigned char msb;
+
+ lsb = data & 0xff;
+ msb = (data >> 8) & 0xff;
+ if (board->is_jr) {
+ outb(lsb, dev->iobase + DAS08JR_AO_LSB_REG(chan));
+ outb(msb, dev->iobase + DAS08JR_AO_MSB_REG(chan));
+ /* load DACs */
+ inb(dev->iobase + DAS08JR_AO_UPDATE_REG);
+ } else {
+ outb(lsb, dev->iobase + DAS08AOX_AO_LSB_REG(chan));
+ outb(msb, dev->iobase + DAS08AOX_AO_MSB_REG(chan));
+ /* load DACs */
+ inb(dev->iobase + DAS08AOX_AO_UPDATE_REG);
+ }
+}
+
+static int das08_ao_insn_write(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
+{
+ unsigned int chan = CR_CHAN(insn->chanspec);
+ unsigned int val = s->readback[chan];
+ int i;
+
+ for (i = 0; i < insn->n; i++) {
+ val = data[i];
+ das08_ao_set_data(dev, chan, val);
+ }
+ s->readback[chan] = val;
+
+ return insn->n;
+}
+
+int das08_common_attach(struct comedi_device *dev, unsigned long iobase)
+{
+ const struct das08_board_struct *board = dev->board_ptr;
+ struct das08_private_struct *devpriv = dev->private;
+ struct comedi_subdevice *s;
+ int ret;
+ int i;
+
+ dev->iobase = iobase;
+
+ dev->board_name = board->name;
+
+ ret = comedi_alloc_subdevices(dev, 6);
+ if (ret)
+ return ret;
+
+ s = &dev->subdevices[0];
+ /* ai */
+ if (board->ai_nbits) {
+ s->type = COMEDI_SUBD_AI;
+ /*
+ * XXX some boards actually have differential
+ * inputs instead of single ended.
+ * The driver does nothing with arefs though,
+ * so it's no big deal.
+ */
+ s->subdev_flags = SDF_READABLE | SDF_GROUND;
+ s->n_chan = 8;
+ s->maxdata = (1 << board->ai_nbits) - 1;
+ s->range_table = das08_ai_lranges[board->ai_pg];
+ s->insn_read = das08_ai_insn_read;
+ devpriv->pg_gainlist = das08_ai_gainlists[board->ai_pg];
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
+ s = &dev->subdevices[1];
+ /* ao */
+ if (board->ao_nbits) {
+ s->type = COMEDI_SUBD_AO;
+ s->subdev_flags = SDF_WRITABLE;
+ s->n_chan = 2;
+ s->maxdata = (1 << board->ao_nbits) - 1;
+ s->range_table = &range_bipolar5;
+ s->insn_write = das08_ao_insn_write;
+
+ ret = comedi_alloc_subdev_readback(s);
+ if (ret)
+ return ret;
+
+ /* initialize all channels to 0V */
+ for (i = 0; i < s->n_chan; i++) {
+ s->readback[i] = s->maxdata / 2;
+ das08_ao_set_data(dev, i, s->readback[i]);
+ }
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
+ s = &dev->subdevices[2];
+ /* di */
+ if (board->di_nchan) {
+ s->type = COMEDI_SUBD_DI;
+ s->subdev_flags = SDF_READABLE;
+ s->n_chan = board->di_nchan;
+ s->maxdata = 1;
+ s->range_table = &range_digital;
+ s->insn_bits = board->is_jr ? das08jr_di_insn_bits :
+ das08_di_insn_bits;
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
+ s = &dev->subdevices[3];
+ /* do */
+ if (board->do_nchan) {
+ s->type = COMEDI_SUBD_DO;
+ s->subdev_flags = SDF_WRITABLE;
+ s->n_chan = board->do_nchan;
+ s->maxdata = 1;
+ s->range_table = &range_digital;
+ s->insn_bits = board->is_jr ? das08jr_do_insn_bits :
+ das08_do_insn_bits;
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
+ s = &dev->subdevices[4];
+ /* 8255 */
+ if (board->i8255_offset != 0) {
+ ret = subdev_8255_init(dev, s, NULL, board->i8255_offset);
+ if (ret)
+ return ret;
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
+ /* Counter subdevice (8254) */
+ s = &dev->subdevices[5];
+ if (board->i8254_offset) {
+ dev->pacer = comedi_8254_init(dev->iobase + board->i8254_offset,
+ 0, I8254_IO8, 0);
+ if (!dev->pacer)
+ return -ENOMEM;
+
+ comedi_8254_subdevice_init(s, dev->pacer);
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(das08_common_attach);
+
+static int __init das08_init(void)
+{
+ return 0;
+}
+module_init(das08_init);
+
+static void __exit das08_exit(void)
+{
+}
+module_exit(das08_exit);
+
+MODULE_AUTHOR("Comedi https://www.comedi.org");
+MODULE_DESCRIPTION("Comedi common DAS08 support module");
+MODULE_LICENSE("GPL");
generated by cgit (git 2.34.1) at 2024-07-04 00:46:39 +0000