diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/mpc624.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/mpc624.c | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/mpc624.c b/drivers/staging/comedi/drivers/mpc624.c new file mode 100644 index 000000000000..a151602929d9 --- /dev/null +++ b/drivers/staging/comedi/drivers/mpc624.c @@ -0,0 +1,386 @@ +/* + 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]; + rt_printk("comedi%d: mpc624 [0x%04lx, ", dev->minor, iobase); + if (request_region(iobase, MPC624_SIZE, "mpc624") == NULL) { + rt_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; + rt_printk("3.52 kHz, "); + break; + case 1: + devpriv->ulConvertionRate = MPC624_SPEED_1_76_kHz; + rt_printk("1.76 kHz, "); + break; + case 2: + devpriv->ulConvertionRate = MPC624_SPEED_880_Hz; + rt_printk("880 Hz, "); + break; + case 3: + devpriv->ulConvertionRate = MPC624_SPEED_440_Hz; + rt_printk("440 Hz, "); + break; + case 4: + devpriv->ulConvertionRate = MPC624_SPEED_220_Hz; + rt_printk("220 Hz, "); + break; + case 5: + devpriv->ulConvertionRate = MPC624_SPEED_110_Hz; + rt_printk("110 Hz, "); + break; + case 6: + devpriv->ulConvertionRate = MPC624_SPEED_55_Hz; + rt_printk("55 Hz, "); + break; + case 7: + devpriv->ulConvertionRate = MPC624_SPEED_27_5_Hz; + rt_printk("27.5 Hz, "); + break; + case 8: + devpriv->ulConvertionRate = MPC624_SPEED_13_75_Hz; + rt_printk("13.75 Hz, "); + break; + case 9: + devpriv->ulConvertionRate = MPC624_SPEED_6_875_Hz; + rt_printk("6.875 Hz, "); + break; + default: + rt_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; + rt_printk("30 bit, "); + } + + switch (it->options[1]) { + case 0: + s->range_table = &range_mpc624_bipolar1; + rt_printk("1.01V]: "); + break; + default: + s->range_table = &range_mpc624_bipolar10; + rt_printk("10.1V]: "); + } + s->len_chanlist = 1; + s->insn_read = mpc624_ai_rinsn; + + rt_printk("attached\n"); + + return 1; +} + +static int mpc624_detach(struct comedi_device * dev) +{ + rt_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); +// rt_printk("Channel %d: \n", insn->chanspec); + if (!insn->n) { + rt_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); + comedi_udelay(1); + outb(MPC624_ADCS | MPC624_ADSCK, dev->iobase + MPC624_ADC); + comedi_udelay(1); + outb(0, dev->iobase + MPC624_ADC); + comedi_udelay(1); + + // Wait for the convertion to end + for (i = 0; i < TIMEOUT; i++) { + ucPort = inb(dev->iobase + MPC624_ADC); + if (ucPort & MPC624_ADBUSY) + comedi_udelay(1000); + else + break; + } + if (i == TIMEOUT) { + rt_printk("MPC624: timeout (%dms)\n", TIMEOUT); + data[n] = 0; + return -ETIMEDOUT; + } + // Start reading data + data_in = 0; + data_out = devpriv->ulConvertionRate; + comedi_udelay(1); + for (i = 0; i < 32; i++) { + // Set the clock low + outb(0, dev->iobase + MPC624_ADC); + comedi_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); + comedi_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); + comedi_udelay(1); + // Set the clock high + outb(MPC624_ADSCK, dev->iobase + MPC624_ADC); + } + // Read ADSDO on high clock (receive from MPC624) + comedi_udelay(1); + data_in <<= 1; + data_in |= + (inb(dev->iobase + + MPC624_ADC) & MPC624_ADSDO) >> 4; + comedi_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) + rt_printk("MPC624: EOC bit is set (data_in=%lu)!", + data_in); + if (data_in & MPC624_DMY_BIT) + rt_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); |