From 99999e27475c9cbed2d59ac33f1d6f21bf9e260d Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Tue, 11 Mar 2014 12:04:17 -0700 Subject: [PATCH] staging: comedi: dac02: introduce comedi driver for DAC02 boards This board is currently supported by the poc driver. That driver used to support a number of simple boards but now only provides support for the DAC02 board. Introduce a new comedi driver specifically for the DAC02 board. This allows cleaning up all the cruft. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/Kconfig | 8 ++ drivers/staging/comedi/drivers/Makefile | 1 + drivers/staging/comedi/drivers/dac02.c | 172 ++++++++++++++++++++++++++++++++ 3 files changed, 181 insertions(+) create mode 100644 drivers/staging/comedi/drivers/dac02.c diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig index 1a7e8e1..88135e7 100644 --- a/drivers/staging/comedi/Kconfig +++ b/drivers/staging/comedi/Kconfig @@ -260,6 +260,14 @@ config COMEDI_RTI802 To compile this driver as a module, choose M here: the module will be called rti802. +config COMEDI_DAC02 + tristate "Keithley Metrabyte DAC02 compatible ISA card support" + ---help--- + Enable support for Keithley Metrabyte DAC02 compatible ISA cards. + + To compile this driver as a module, choose M here: the module will be + called dac02. + config COMEDI_DAS16M1 tristate "MeasurementComputing CIO-DAS16/M1DAS-16 ISA card support" select COMEDI_8255 diff --git a/drivers/staging/comedi/drivers/Makefile b/drivers/staging/comedi/drivers/Makefile index 2706f58..a1c60fd 100644 --- a/drivers/staging/comedi/drivers/Makefile +++ b/drivers/staging/comedi/drivers/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_COMEDI_PCL818) += pcl818.o obj-$(CONFIG_COMEDI_PCM3724) += pcm3724.o obj-$(CONFIG_COMEDI_RTI800) += rti800.o obj-$(CONFIG_COMEDI_RTI802) += rti802.o +obj-$(CONFIG_COMEDI_DAC02) += dac02.o obj-$(CONFIG_COMEDI_DAS16M1) += das16m1.o obj-$(CONFIG_COMEDI_DAS08_ISA) += das08_isa.o obj-$(CONFIG_COMEDI_DAS16) += das16.o diff --git a/drivers/staging/comedi/drivers/dac02.c b/drivers/staging/comedi/drivers/dac02.c new file mode 100644 index 0000000..df46e0a --- /dev/null +++ b/drivers/staging/comedi/drivers/dac02.c @@ -0,0 +1,172 @@ +/* + * dac02.c + * Comedi driver for DAC02 compatible boards + * Copyright (C) 2014 H Hartley Sweeten + * + * Based on the poc driver + * Copyright (C) 2000 Frank Mori Hess + * Copyright (C) 2001 David A. Schleef + * + * COMEDI - Linux Control and Measurement Device Interface + * Copyright (C) 1998 David A. Schleef + * + * 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: dac02 + * Description: Comedi driver for DAC02 compatible boards + * Devices: (Keithley Metrabyte) DAC-02 [dac02] + * Author: H Hartley Sweeten + * Updated: Tue, 11 Mar 2014 11:27:19 -0700 + * Status: unknown + * + * Configuration options: + * [0] - I/O port base + */ + +#include + +#include "../comedidev.h" + +/* + * The output range is selected by jumpering pins on the I/O connector. + * + * Range Chan # Jumper pins Output + * ------------- ------ ------------- ----------------- + * 0 to 5V 0 21 to 22 24 + * 1 15 to 16 18 + * 0 to 10V 0 20 to 22 24 + * 1 14 to 16 18 + * +/-5V 0 21 to 22 23 + * 1 15 to 16 17 + * +/-10V 0 20 to 22 23 + * 1 14 to 16 17 + * 4 to 20mA 0 21 to 22 25 + * 1 15 to 16 19 + * AC reference 0 In on pin 22 24 (2-quadrant) + * In on pin 22 23 (4-quadrant) + * 1 In on pin 16 18 (2-quadrant) + * In on pin 16 17 (4-quadrant) + */ +static const struct comedi_lrange das02_ao_ranges = { + 6, { + UNI_RANGE(5), + UNI_RANGE(10), + BIP_RANGE(5), + BIP_RANGE(10), + RANGE_mA(4, 20), + RANGE_ext(0, 1) + } +}; + +struct dac02_private { + unsigned int ao_readback[2]; +}; + +/* + * Register I/O map + */ +#define DAC02_AO_LSB(x) (0x00 + ((x) * 2)) +#define DAC02_AO_MSB(x) (0x01 + ((x) * 2)) + +static int dac02_ao_insn_write(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct dac02_private *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int range = CR_RANGE(insn->chanspec); + unsigned int val; + int i; + + for (i = 0; i < insn->n; i++) { + val = data[i]; + + devpriv->ao_readback[chan] = val; + + /* + * Unipolar outputs are true binary encoding. + * Bipolar outputs are complementary offset binary + * (that is, 0 = +full scale, maxdata = -full scale). + */ + if (comedi_range_is_bipolar(s, range)) + val = s->maxdata - val; + + /* + * DACs are double-buffered. + * Write LSB then MSB to latch output. + */ + outb((val << 4) & 0xf0, dev->iobase + DAC02_AO_LSB(chan)); + outb((val >> 4) & 0xff, dev->iobase + DAC02_AO_MSB(chan)); + } + + return insn->n; +} + +static int dac02_ao_insn_read(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct dac02_private *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); + int i; + + for (i = 0; i < insn->n; i++) + data[i] = devpriv->ao_readback[chan]; + + return insn->n; +} + +static int dac02_attach(struct comedi_device *dev, struct comedi_devconfig *it) +{ + struct dac02_private *devpriv; + struct comedi_subdevice *s; + int ret; + + devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); + if (!devpriv) + return -ENOMEM; + + ret = comedi_request_region(dev, it->options[0], 0x08); + if (ret) + return ret; + + ret = comedi_alloc_subdevices(dev, 1); + if (ret) + return ret; + + /* Analog Output subdevice */ + s = &dev->subdevices[0]; + s->type = COMEDI_SUBD_AO; + s->subdev_flags = SDF_WRITABLE; + s->n_chan = 2; + s->maxdata = 0x0fff; + s->range_table = &das02_ao_ranges; + s->insn_write = dac02_ao_insn_write; + s->insn_read = dac02_ao_insn_read; + + return 0; +} + +static struct comedi_driver dac02_driver = { + .driver_name = "dac02", + .module = THIS_MODULE, + .attach = dac02_attach, + .detach = comedi_legacy_detach, +}; +module_comedi_driver(dac02_driver); + +MODULE_AUTHOR("H Hartley Sweeten "); +MODULE_DESCRIPTION("Comedi driver for DAC02 compatible boards"); +MODULE_LICENSE("GPL"); -- 2.7.4