| /* |
| 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. |
| |
| 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: 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] - convertion rate |
| Convertion 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 "../comedidev.h" |
| |
| #include <linux/ioport.h> |
| #include <linux/delay.h> |
| |
| /* Consecutive I/O port addresses */ |
| #define MPC624_SIZE 16 |
| |
| /* 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) |
| |
| /* Convertion speeds */ |
| /* OSR4 OSR3 OSR2 OSR1 OSR0 Convertion 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 skel_private { |
| |
| unsigned long int ulConvertionRate; /* set by mpc624_attach() from driver's parameters */ |
| }; |
| |
| |
| #define devpriv ((struct skel_private *)dev->private) |
| /* ---------------------------------------------------------------------------- */ |
| 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_attach(struct comedi_device *dev, struct comedi_devconfig *it); |
| static int mpc624_detach(struct comedi_device *dev); |
| /* ---------------------------------------------------------------------------- */ |
| static struct comedi_driver driver_mpc624 = { |
| .driver_name = "mpc624", |
| .module = THIS_MODULE, |
| .attach = mpc624_attach, |
| .detach = mpc624_detach |
| }; |
| |
| /* ---------------------------------------------------------------------------- */ |
| static int mpc624_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, |
| struct comedi_insn *insn, unsigned int *data); |
| /* ---------------------------------------------------------------------------- */ |
| static int mpc624_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
| { |
| struct comedi_subdevice *s; |
| unsigned long iobase; |
| |
| iobase = it->options[0]; |
| printk("comedi%d: mpc624 [0x%04lx, ", dev->minor, iobase); |
| if (request_region(iobase, MPC624_SIZE, "mpc624") == NULL) { |
| printk("I/O port(s) in use\n"); |
| return -EIO; |
| } |
| |
| dev->iobase = iobase; |
| dev->board_name = "mpc624"; |
| |
| /* Private structure initialization */ |
| if (alloc_private(dev, sizeof(struct skel_private)) < 0) |
| return -ENOMEM; |
| |
| switch (it->options[1]) { |
| case 0: |
| devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz; |
| printk("3.52 kHz, "); |
| break; |
| case 1: |
| devpriv->ulConvertionRate = MPC624_SPEED_1_76_kHz; |
| printk("1.76 kHz, "); |
| break; |
| case 2: |
| devpriv->ulConvertionRate = MPC624_SPEED_880_Hz; |
| printk("880 Hz, "); |
| break; |
| case 3: |
| devpriv->ulConvertionRate = MPC624_SPEED_440_Hz; |
| printk("440 Hz, "); |
| break; |
| case 4: |
| devpriv->ulConvertionRate = MPC624_SPEED_220_Hz; |
| printk("220 Hz, "); |
| break; |
| case 5: |
| devpriv->ulConvertionRate = MPC624_SPEED_110_Hz; |
| printk("110 Hz, "); |
| break; |
| case 6: |
| devpriv->ulConvertionRate = MPC624_SPEED_55_Hz; |
| printk("55 Hz, "); |
| break; |
| case 7: |
| devpriv->ulConvertionRate = MPC624_SPEED_27_5_Hz; |
| printk("27.5 Hz, "); |
| break; |
| case 8: |
| devpriv->ulConvertionRate = MPC624_SPEED_13_75_Hz; |
| printk("13.75 Hz, "); |
| break; |
| case 9: |
| devpriv->ulConvertionRate = MPC624_SPEED_6_875_Hz; |
| printk("6.875 Hz, "); |
| break; |
| default: |
| printk |
| ("illegal convertion rate setting! Valid numbers are 0..9. Using 9 => 6.875 Hz, "); |
| devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz; |
| } |
| |
| /* Subdevices structures */ |
| if (alloc_subdevices(dev, 1) < 0) |
| return -ENOMEM; |
| |
| 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; |
| printk("30 bit, "); |
| } |
| |
| switch (it->options[1]) { |
| case 0: |
| s->range_table = &range_mpc624_bipolar1; |
| printk("1.01V]: "); |
| break; |
| default: |
| s->range_table = &range_mpc624_bipolar10; |
| printk("10.1V]: "); |
| } |
| s->len_chanlist = 1; |
| s->insn_read = mpc624_ai_rinsn; |
| |
| printk("attached\n"); |
| |
| return 1; |
| } |
| |
| static int mpc624_detach(struct comedi_device *dev) |
| { |
| printk("comedi%d: mpc624: remove\n", dev->minor); |
| |
| if (dev->iobase) |
| release_region(dev->iobase, MPC624_SIZE); |
| |
| return 0; |
| } |
| |
| /* Timeout 200ms */ |
| #define TIMEOUT 200 |
| |
| static int mpc624_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, |
| struct comedi_insn *insn, unsigned int *data) |
| { |
| int n, i; |
| unsigned long int data_in, data_out; |
| unsigned char ucPort; |
| |
| /* WARNING: We always write 0 to GNSWA bit, so the channel range is +-/10.1Vdc */ |
| outb(insn->chanspec, dev->iobase + MPC624_GNMUXCH); |
| /* printk("Channel %d: \n", insn->chanspec); */ |
| if (!insn->n) { |
| printk("MPC624: Warning, no data to aquire\n"); |
| return 0; |
| } |
| |
| for (n = 0; n < insn->n; n++) { |
| /* Trigger the convertion */ |
| 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 convertion to end */ |
| for (i = 0; i < TIMEOUT; i++) { |
| ucPort = inb(dev->iobase + MPC624_ADC); |
| if (ucPort & MPC624_ADBUSY) |
| udelay(1000); |
| else |
| break; |
| } |
| if (i == TIMEOUT) { |
| printk("MPC624: timeout (%dms)\n", TIMEOUT); |
| data[n] = 0; |
| return -ETIMEDOUT; |
| } |
| /* 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 convertion result */ |
| /* .... */ |
| /* 05: LSB (Least Significant Bit) - the last bit of convertion result */ |
| /* 04: sub-LSB - sub-LSBs are basically noise, but when */ |
| /* 03: sub-LSB averaged properly, they can increase convertion */ |
| /* 02: sub-LSB precision up to 29 bits; they can be discarded */ |
| /* 01: sub-LSB without loss of resolution. */ |
| /* 00: sub-LSB */ |
| |
| if (data_in & MPC624_EOC_BIT) |
| printk("MPC624: EOC bit is set (data_in=%lu)!", |
| data_in); |
| if (data_in & MPC624_DMY_BIT) |
| printk("MPC624: DMY bit is set (data_in=%lu)!", |
| data_in); |
| if (data_in & MPC624_SGN_BIT) /* check the sign bit */ |
| { /* The voltage is positive */ |
| data_in &= 0x3FFFFFFF; /* EOC and DMY should be 0, but we will mask them out just to be sure */ |
| data[n] = data_in; /* comedi operates on unsigned numbers, so we don't clear the SGN bit */ |
| /* SGN bit is still set! It's correct, since we're converting to unsigned. */ |
| } 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; |
| } |
| |
| COMEDI_INITCLEANUP(driver_mpc624); |
