--- /dev/null
+/*
+ comedi/drivers/mpc624.c
+ Hardware driver for a Micro/sys inc. MPC-624 PC/104 board
+
+ COMEDI - Linux Control and Measurement Device Interface
+ Copyright (C) 2000 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: mpc624
+Description: Micro/sys MPC-624 PC/104 board
+Devices: [Micro/sys] MPC-624 (mpc624)
+Author: Stanislaw Raczynski <sraczynski@op.pl>
+Updated: Thu, 15 Sep 2005 12:01:18 +0200
+Status: working
+
+ The Micro/sys MPC-624 board is based on the LTC2440 24-bit sigma-delta
+ ADC chip.
+
+ Subdevices supported by the driver:
+ - Analog In: supported
+ - Digital I/O: not supported
+ - LEDs: not supported
+ - EEPROM: not supported
+
+Configuration Options:
+ [0] - I/O base address
+ [1] - conversion rate
+ Conversion rate RMS noise Effective Number Of Bits
+ 0 3.52kHz 23uV 17
+ 1 1.76kHz 3.5uV 20
+ 2 880Hz 2uV 21.3
+ 3 440Hz 1.4uV 21.8
+ 4 220Hz 1uV 22.4
+ 5 110Hz 750uV 22.9
+ 6 55Hz 510nV 23.4
+ 7 27.5Hz 375nV 24
+ 8 13.75Hz 250nV 24.4
+ 9 6.875Hz 200nV 24.6
+ [2] - voltage range
+ 0 -1.01V .. +1.01V
+ 1 -10.1V .. +10.1V
+*/
+
+#include <linux/module.h>
+#include "../comedidev.h"
+
+#include <linux/delay.h>
+
+/* Offsets of different ports */
+#define MPC624_MASTER_CONTROL 0 /* not used */
+#define MPC624_GNMUXCH 1 /* Gain, Mux, Channel of ADC */
+#define MPC624_ADC 2 /* read/write to/from ADC */
+#define MPC624_EE 3 /* read/write to/from serial EEPROM via I2C */
+#define MPC624_LEDS 4 /* write to LEDs */
+#define MPC624_DIO 5 /* read/write to/from digital I/O ports */
+#define MPC624_IRQ_MASK 6 /* IRQ masking enable/disable */
+
+/* Register bits' names */
+#define MPC624_ADBUSY (1<<5)
+#define MPC624_ADSDO (1<<4)
+#define MPC624_ADFO (1<<3)
+#define MPC624_ADCS (1<<2)
+#define MPC624_ADSCK (1<<1)
+#define MPC624_ADSDI (1<<0)
+
+/* SDI Speed/Resolution Programming bits */
+#define MPC624_OSR4 (1<<31)
+#define MPC624_OSR3 (1<<30)
+#define MPC624_OSR2 (1<<29)
+#define MPC624_OSR1 (1<<28)
+#define MPC624_OSR0 (1<<27)
+
+/* 32-bit output value bits' names */
+#define MPC624_EOC_BIT (1<<31)
+#define MPC624_DMY_BIT (1<<30)
+#define MPC624_SGN_BIT (1<<29)
+
+/* Conversion speeds */
+/* OSR4 OSR3 OSR2 OSR1 OSR0 Conversion rate RMS noise ENOB^
+ * X 0 0 0 1 3.52kHz 23uV 17
+ * X 0 0 1 0 1.76kHz 3.5uV 20
+ * X 0 0 1 1 880Hz 2uV 21.3
+ * X 0 1 0 0 440Hz 1.4uV 21.8
+ * X 0 1 0 1 220Hz 1uV 22.4
+ * X 0 1 1 0 110Hz 750uV 22.9
+ * X 0 1 1 1 55Hz 510nV 23.4
+ * X 1 0 0 0 27.5Hz 375nV 24
+ * X 1 0 0 1 13.75Hz 250nV 24.4
+ * X 1 1 1 1 6.875Hz 200nV 24.6
+ *
+ * ^ - Effective Number Of Bits
+ */
+
+#define MPC624_SPEED_3_52_kHz (MPC624_OSR4 | MPC624_OSR0)
+#define MPC624_SPEED_1_76_kHz (MPC624_OSR4 | MPC624_OSR1)
+#define MPC624_SPEED_880_Hz (MPC624_OSR4 | MPC624_OSR1 | MPC624_OSR0)
+#define MPC624_SPEED_440_Hz (MPC624_OSR4 | MPC624_OSR2)
+#define MPC624_SPEED_220_Hz (MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR0)
+#define MPC624_SPEED_110_Hz (MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR1)
+#define MPC624_SPEED_55_Hz \
+ (MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR1 | MPC624_OSR0)
+#define MPC624_SPEED_27_5_Hz (MPC624_OSR4 | MPC624_OSR3)
+#define MPC624_SPEED_13_75_Hz (MPC624_OSR4 | MPC624_OSR3 | MPC624_OSR0)
+#define MPC624_SPEED_6_875_Hz \
+ (MPC624_OSR4 | MPC624_OSR3 | MPC624_OSR2 | MPC624_OSR1 | MPC624_OSR0)
+/* -------------------------------------------------------------------------- */
+struct mpc624_private {
+ /* set by mpc624_attach() from driver's parameters */
+ unsigned long int ulConvertionRate;
+};
+
+/* -------------------------------------------------------------------------- */
+static const struct comedi_lrange range_mpc624_bipolar1 = {
+ 1,
+ {
+/* BIP_RANGE(1.01) this is correct, */
+ /* but my MPC-624 actually seems to have a range of 2.02 */
+ BIP_RANGE(2.02)
+ }
+};
+
+static const struct comedi_lrange range_mpc624_bipolar10 = {
+ 1,
+ {
+/* BIP_RANGE(10.1) this is correct, */
+ /* but my MPC-624 actually seems to have a range of 20.2 */
+ BIP_RANGE(20.2)
+ }
+};
+
+static int mpc624_ai_eoc(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned long context)
+{
+ unsigned char status;
+
+ status = inb(dev->iobase + MPC624_ADC);
+ if ((status & MPC624_ADBUSY) == 0)
+ return 0;
+ return -EBUSY;
+}
+
+static int mpc624_ai_rinsn(struct comedi_device *dev,
+ struct comedi_subdevice *s, struct comedi_insn *insn,
+ unsigned int *data)
+{
+ struct mpc624_private *devpriv = dev->private;
+ int n, i;
+ unsigned long int data_in, data_out;
+ int ret;
+
+ /*
+ * WARNING:
+ * We always write 0 to GNSWA bit, so the channel range is +-/10.1Vdc
+ */
+ outb(insn->chanspec, dev->iobase + MPC624_GNMUXCH);
+
+ for (n = 0; n < insn->n; n++) {
+ /* Trigger the conversion */
+ outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
+ udelay(1);
+ outb(MPC624_ADCS | MPC624_ADSCK, dev->iobase + MPC624_ADC);
+ udelay(1);
+ outb(0, dev->iobase + MPC624_ADC);
+ udelay(1);
+
+ /* Wait for the conversion to end */
+ ret = comedi_timeout(dev, s, insn, mpc624_ai_eoc, 0);
+ if (ret)
+ return ret;
+
+ /* Start reading data */
+ data_in = 0;
+ data_out = devpriv->ulConvertionRate;
+ udelay(1);
+ for (i = 0; i < 32; i++) {
+ /* Set the clock low */
+ outb(0, dev->iobase + MPC624_ADC);
+ udelay(1);
+
+ if (data_out & (1 << 31)) { /* the next bit is a 1 */
+ /* Set the ADSDI line (send to MPC624) */
+ outb(MPC624_ADSDI, dev->iobase + MPC624_ADC);
+ udelay(1);
+ /* Set the clock high */
+ outb(MPC624_ADSCK | MPC624_ADSDI,
+ dev->iobase + MPC624_ADC);
+ } else { /* the next bit is a 0 */
+
+ /* Set the ADSDI line (send to MPC624) */
+ outb(0, dev->iobase + MPC624_ADC);
+ udelay(1);
+ /* Set the clock high */
+ outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
+ }
+ /* Read ADSDO on high clock (receive from MPC624) */
+ udelay(1);
+ data_in <<= 1;
+ data_in |=
+ (inb(dev->iobase + MPC624_ADC) & MPC624_ADSDO) >> 4;
+ udelay(1);
+
+ data_out <<= 1;
+ }
+
+ /*
+ * Received 32-bit long value consist of:
+ * 31: EOC -
+ * (End Of Transmission) bit - should be 0
+ * 30: DMY
+ * (Dummy) bit - should be 0
+ * 29: SIG
+ * (Sign) bit- 1 if the voltage is positive,
+ * 0 if negative
+ * 28: MSB
+ * (Most Significant Bit) - the first bit of
+ * the conversion result
+ * ....
+ * 05: LSB
+ * (Least Significant Bit)- the last bit of the
+ * conversion result
+ * 04-00: sub-LSB
+ * - sub-LSBs are basically noise, but when
+ * averaged properly, they can increase conversion
+ * precision up to 29 bits; they can be discarded
+ * without loss of resolution.
+ */
+
+ if (data_in & MPC624_EOC_BIT)
+ dev_dbg(dev->class_dev,
+ "EOC bit is set (data_in=%lu)!", data_in);
+ if (data_in & MPC624_DMY_BIT)
+ dev_dbg(dev->class_dev,
+ "DMY bit is set (data_in=%lu)!", data_in);
+ if (data_in & MPC624_SGN_BIT) { /* Volatge is positive */
+ /*
+ * comedi operates on unsigned numbers, so mask off EOC
+ * and DMY and don't clear the SGN bit
+ */
+ data_in &= 0x3FFFFFFF;
+ data[n] = data_in;
+ } else { /* The voltage is negative */
+ /*
+ * data_in contains a number in 30-bit two's complement
+ * code and we must deal with it
+ */
+ data_in |= MPC624_SGN_BIT;
+ data_in = ~data_in;
+ data_in += 1;
+ data_in &= ~(MPC624_EOC_BIT | MPC624_DMY_BIT);
+ /* clear EOC and DMY bits */
+ data_in = 0x20000000 - data_in;
+ data[n] = data_in;
+ }
+ }
+
+ /* Return the number of samples read/written */
+ return n;
+}
+
+static int mpc624_attach(struct comedi_device *dev, struct comedi_devconfig *it)
+{
+ struct mpc624_private *devpriv;
+ struct comedi_subdevice *s;
+ int ret;
+
+ ret = comedi_request_region(dev, it->options[0], 0x10);
+ if (ret)
+ return ret;
+
+ devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
+ if (!devpriv)
+ return -ENOMEM;
+
+ switch (it->options[1]) {
+ case 0:
+ devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
+ break;
+ case 1:
+ devpriv->ulConvertionRate = MPC624_SPEED_1_76_kHz;
+ break;
+ case 2:
+ devpriv->ulConvertionRate = MPC624_SPEED_880_Hz;
+ break;
+ case 3:
+ devpriv->ulConvertionRate = MPC624_SPEED_440_Hz;
+ break;
+ case 4:
+ devpriv->ulConvertionRate = MPC624_SPEED_220_Hz;
+ break;
+ case 5:
+ devpriv->ulConvertionRate = MPC624_SPEED_110_Hz;
+ break;
+ case 6:
+ devpriv->ulConvertionRate = MPC624_SPEED_55_Hz;
+ break;
+ case 7:
+ devpriv->ulConvertionRate = MPC624_SPEED_27_5_Hz;
+ break;
+ case 8:
+ devpriv->ulConvertionRate = MPC624_SPEED_13_75_Hz;
+ break;
+ case 9:
+ devpriv->ulConvertionRate = MPC624_SPEED_6_875_Hz;
+ break;
+ default:
+ devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
+ }
+
+ 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_DIFF;
+ s->n_chan = 8;
+ switch (it->options[1]) {
+ default:
+ s->maxdata = 0x3FFFFFFF;
+ }
+
+ switch (it->options[1]) {
+ case 0:
+ s->range_table = &range_mpc624_bipolar1;
+ break;
+ default:
+ s->range_table = &range_mpc624_bipolar10;
+ }
+ s->len_chanlist = 1;
+ s->insn_read = mpc624_ai_rinsn;
+
+ return 0;
+}
+
+static struct comedi_driver mpc624_driver = {
+ .driver_name = "mpc624",
+ .module = THIS_MODULE,
+ .attach = mpc624_attach,
+ .detach = comedi_legacy_detach,
+};
+module_comedi_driver(mpc624_driver);
+
+MODULE_AUTHOR("Comedi http://www.comedi.org");
+MODULE_DESCRIPTION("Comedi low-level driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff