--- /dev/null
+/*
+ comedi/drivers/adv_pci1724.c
+ This is a driver for the Advantech PCI-1724U card.
+
+ Author: Frank Mori Hess <fmh6jj@gmail.com>
+ Copyright (C) 2013 GnuBIO Inc
+
+ 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.
+
+ 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: adv_1724
+Description: Advantech PCI-1724U
+Author: Frank Mori Hess <fmh6jj@gmail.com>
+Status: works
+Updated: 2013-02-09
+Devices: [Advantech] PCI-1724U (adv_pci1724)
+
+Subdevice 0 is the analog output.
+Subdevice 1 is the offset calibration for the analog output.
+Subdevice 2 is the gain calibration for the analog output.
+
+The calibration offset and gains have quite a large effect
+on the analog output, so it is possible to adjust the analog output to
+have an output range significantly different from the board's
+nominal output ranges. For a calibrated +/- 10V range, the analog
+output's offset will be set somewhere near mid-range (0x2000) and its
+gain will be near maximum (0x3fff).
+
+There is really no difference between the board's documented 0-20mA
+versus 4-20mA output ranges. To pick one or the other is simply a matter
+of adjusting the offset and gain calibration until the board outputs in
+the desired range.
+
+Configuration options:
+ None
+
+Manual configuration of comedi devices is not supported by this driver;
+supported PCI devices are configured as comedi devices automatically.
+
+*/
+
+#include <linux/pci.h>
+
+#include "../comedidev.h"
+
+#define PCI_VENDOR_ID_ADVANTECH 0x13fe
+
+#define NUM_AO_CHANNELS 32
+
+/* register offsets */
+enum board_registers {
+ DAC_CONTROL_REG = 0x0,
+ SYNC_OUTPUT_REG = 0x4,
+ EEPROM_CONTROL_REG = 0x8,
+ SYNC_OUTPUT_TRIGGER_REG = 0xc,
+ BOARD_ID_REG = 0x10
+};
+
+/* bit definitions for registers */
+enum dac_control_contents {
+ DAC_DATA_MASK = 0x3fff,
+ DAC_DESTINATION_MASK = 0xc000,
+ DAC_NORMAL_MODE = 0xc000,
+ DAC_OFFSET_MODE = 0x8000,
+ DAC_GAIN_MODE = 0x4000,
+ DAC_CHANNEL_SELECT_MASK = 0xf0000,
+ DAC_GROUP_SELECT_MASK = 0xf00000
+};
+
+static uint32_t dac_data_bits(uint16_t dac_data)
+{
+ return dac_data & DAC_DATA_MASK;
+}
+
+static uint32_t dac_channel_select_bits(unsigned channel)
+{
+ return (channel << 16) & DAC_CHANNEL_SELECT_MASK;
+}
+
+static uint32_t dac_group_select_bits(unsigned group)
+{
+ return (1 << (20 + group)) & DAC_GROUP_SELECT_MASK;
+}
+
+static uint32_t dac_channel_and_group_select_bits(unsigned comedi_channel)
+{
+ return dac_channel_select_bits(comedi_channel % 8) |
+ dac_group_select_bits(comedi_channel / 8);
+}
+
+enum sync_output_contents {
+ SYNC_MODE = 0x1,
+ DAC_BUSY = 0x2, /* dac state machine is not ready */
+};
+
+enum sync_output_trigger_contents {
+ SYNC_TRIGGER_BITS = 0x0 /* any value works */
+};
+
+enum board_id_contents {
+ BOARD_ID_MASK = 0xf
+};
+
+static const struct comedi_lrange ao_ranges_1724 = { 4,
+ {
+ BIP_RANGE(10),
+ RANGE_mA(0, 20),
+ RANGE_mA(4, 20),
+ RANGE_unitless(0, 1)
+ }
+};
+
+static const struct comedi_lrange *const ao_range_list_1724[NUM_AO_CHANNELS] = {
+ [0 ... NUM_AO_CHANNELS - 1] = &ao_ranges_1724,
+};
+
+/* this structure is for data unique to this hardware driver. */
+struct adv_pci1724_private {
+ int ao_value[NUM_AO_CHANNELS];
+ int offset_value[NUM_AO_CHANNELS];
+ int gain_value[NUM_AO_CHANNELS];
+};
+
+static int wait_for_dac_idle(struct comedi_device *dev)
+{
+ static const int timeout = 10000;
+ int i;
+
+ for (i = 0; i < timeout; ++i) {
+ if ((inl(dev->iobase + SYNC_OUTPUT_REG) & DAC_BUSY) == 0)
+ break;
+ udelay(1);
+ }
+ if (i == timeout) {
+ comedi_error(dev, "Timed out waiting for dac to become idle.");
+ return -EIO;
+ }
+ return 0;
+}
+
+static int set_dac(struct comedi_device *dev, unsigned mode, unsigned channel,
+ unsigned data)
+{
+ int retval;
+ unsigned control_bits;
+
+ retval = wait_for_dac_idle(dev);
+ if (retval < 0)
+ return retval;
+
+ control_bits = mode;
+ control_bits |= dac_channel_and_group_select_bits(channel);
+ control_bits |= dac_data_bits(data);
+ outl(control_bits, dev->iobase + DAC_CONTROL_REG);
+ return 0;
+}
+
+static int ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ struct adv_pci1724_private *devpriv = dev->private;
+ int channel = CR_CHAN(insn->chanspec);
+ int retval;
+ int i;
+
+ /* turn off synchronous mode */
+ outl(0, dev->iobase + SYNC_OUTPUT_REG);
+
+ for (i = 0; i < insn->n; ++i) {
+ retval = set_dac(dev, DAC_NORMAL_MODE, channel, data[i]);
+ if (retval < 0)
+ return retval;
+ devpriv->ao_value[channel] = data[i];
+ }
+ return insn->n;
+}
+
+static int ao_readback_insn(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ struct adv_pci1724_private *devpriv = dev->private;
+ int channel = CR_CHAN(insn->chanspec);
+ int i;
+
+ if (devpriv->ao_value[channel] < 0) {
+ comedi_error(dev,
+ "Cannot read back channels which have not yet been written to.");
+ return -EIO;
+ }
+ for (i = 0; i < insn->n; i++)
+ data[i] = devpriv->ao_value[channel];
+
+ return insn->n;
+}
+
+static int offset_write_insn(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ struct adv_pci1724_private *devpriv = dev->private;
+ int channel = CR_CHAN(insn->chanspec);
+ int retval;
+ int i;
+
+ /* turn off synchronous mode */
+ outl(0, dev->iobase + SYNC_OUTPUT_REG);
+
+ for (i = 0; i < insn->n; ++i) {
+ retval = set_dac(dev, DAC_OFFSET_MODE, channel, data[i]);
+ if (retval < 0)
+ return retval;
+ devpriv->offset_value[channel] = data[i];
+ }
+
+ return insn->n;
+}
+
+static int offset_read_insn(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ struct adv_pci1724_private *devpriv = dev->private;
+ unsigned int channel = CR_CHAN(insn->chanspec);
+ int i;
+
+ if (devpriv->offset_value[channel] < 0) {
+ comedi_error(dev,
+ "Cannot read back channels which have not yet been written to.");
+ return -EIO;
+ }
+ for (i = 0; i < insn->n; i++)
+ data[i] = devpriv->offset_value[channel];
+
+ return insn->n;
+}
+
+static int gain_write_insn(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ struct adv_pci1724_private *devpriv = dev->private;
+ int channel = CR_CHAN(insn->chanspec);
+ int retval;
+ int i;
+
+ /* turn off synchronous mode */
+ outl(0, dev->iobase + SYNC_OUTPUT_REG);
+
+ for (i = 0; i < insn->n; ++i) {
+ retval = set_dac(dev, DAC_GAIN_MODE, channel, data[i]);
+ if (retval < 0)
+ return retval;
+ devpriv->gain_value[channel] = data[i];
+ }
+
+ return insn->n;
+}
+
+static int gain_read_insn(struct comedi_device *dev,
+ struct comedi_subdevice *s, struct comedi_insn *insn,
+ unsigned int *data)
+{
+ struct adv_pci1724_private *devpriv = dev->private;
+ unsigned int channel = CR_CHAN(insn->chanspec);
+ int i;
+
+ if (devpriv->gain_value[channel] < 0) {
+ comedi_error(dev,
+ "Cannot read back channels which have not yet been written to.");
+ return -EIO;
+ }
+ for (i = 0; i < insn->n; i++)
+ data[i] = devpriv->gain_value[channel];
+
+ return insn->n;
+}
+
+/* Allocate and initialize the subdevice structures.
+ */
+static int setup_subdevices(struct comedi_device *dev)
+{
+ struct comedi_subdevice *s;
+ int ret;
+
+ ret = comedi_alloc_subdevices(dev, 3);
+ if (ret)
+ return ret;
+
+ /* analog output subdevice */
+ s = &dev->subdevices[0];
+ s->type = COMEDI_SUBD_AO;
+ s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_GROUND;
+ s->n_chan = NUM_AO_CHANNELS;
+ s->maxdata = 0x3fff;
+ s->range_table_list = ao_range_list_1724;
+ s->insn_read = ao_readback_insn;
+ s->insn_write = ao_winsn;
+
+ /* offset calibration */
+ s = &dev->subdevices[1];
+ s->type = COMEDI_SUBD_CALIB;
+ s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
+ s->n_chan = NUM_AO_CHANNELS;
+ s->insn_read = offset_read_insn;
+ s->insn_write = offset_write_insn;
+ s->maxdata = 0x3fff;
+
+ /* gain calibration */
+ s = &dev->subdevices[2];
+ s->type = COMEDI_SUBD_CALIB;
+ s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
+ s->n_chan = NUM_AO_CHANNELS;
+ s->insn_read = gain_read_insn;
+ s->insn_write = gain_write_insn;
+ s->maxdata = 0x3fff;
+
+ return 0;
+}
+
+static int adv_pci1724_auto_attach(struct comedi_device *dev,
+ unsigned long context_unused)
+{
+ struct pci_dev *pcidev = comedi_to_pci_dev(dev);
+ struct adv_pci1724_private *devpriv;
+ int i;
+ int retval;
+ unsigned int board_id;
+
+ devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
+ if (!devpriv)
+ return -ENOMEM;
+ dev->private = devpriv;
+
+ /* init software copies of output values to indicate we don't know
+ * what the output value is since it has never been written. */
+ for (i = 0; i < NUM_AO_CHANNELS; ++i) {
+ devpriv->ao_value[i] = -1;
+ devpriv->offset_value[i] = -1;
+ devpriv->gain_value[i] = -1;
+ }
+
+ dev->board_name = dev->driver->driver_name;
+
+ retval = comedi_pci_enable(pcidev, dev->board_name);
+ if (retval)
+ return retval;
+
+ dev->iobase = pci_resource_start(pcidev, 2);
+ board_id = inl(dev->iobase + BOARD_ID_REG) & BOARD_ID_MASK;
+ dev_info(dev->class_dev, "board id: %d\n", board_id);
+
+ retval = setup_subdevices(dev);
+ if (retval < 0)
+ return retval;
+
+ dev_info(dev->class_dev, "%s (pci %s) attached, board id: %u\n",
+ dev->board_name, pci_name(pcidev), board_id);
+ return 0;
+}
+
+static void adv_pci1724_detach(struct comedi_device *dev)
+{
+ struct pci_dev *pcidev = comedi_to_pci_dev(dev);
+
+ if (pcidev && dev->iobase) {
+ comedi_pci_disable(pcidev);
+ dev_info(dev->class_dev, "detached\n");
+ }
+}
+
+static struct comedi_driver adv_pci1724_driver = {
+ .driver_name = "adv_pci1724",
+ .module = THIS_MODULE,
+ .auto_attach = adv_pci1724_auto_attach,
+ .detach = adv_pci1724_detach,
+};
+
+static int adv_pci1724_pci_probe(struct pci_dev *dev,
+ const struct pci_device_id *id)
+{
+ return comedi_pci_auto_config(dev, &adv_pci1724_driver,
+ id->driver_data);
+}
+
+static DEFINE_PCI_DEVICE_TABLE(adv_pci1724_pci_table) = {
+ { PCI_DEVICE(PCI_VENDOR_ID_ADVANTECH, 0x1724) },
+ { 0 }
+};
+MODULE_DEVICE_TABLE(pci, adv_pci1724_pci_table);
+
+static struct pci_driver adv_pci1724_pci_driver = {
+ .name = "adv_pci1724",
+ .id_table = adv_pci1724_pci_table,
+ .probe = adv_pci1724_pci_probe,
+ .remove = comedi_pci_auto_unconfig,
+};
+
+module_comedi_pci_driver(adv_pci1724_driver, adv_pci1724_pci_driver);
+
+MODULE_AUTHOR("Frank Mori Hess <fmh6jj@gmail.com>");
+MODULE_DESCRIPTION("Advantech PCI-1724U Comedi driver");
+MODULE_LICENSE("GPL");
projects / cascardo / linux.git / commitdiff