/* comedi/drivers/ssv_dnp.c generic comedi driver for SSV Embedded Systems' DIL/Net-PCs Copyright (C) 2001 Robert Schwebel COMEDI - Linux Control and Measurement Device Interface Copyright (C) 2000 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. 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: ssv_dnp Description: SSV Embedded Systems DIL/Net-PC Author: Robert Schwebel Devices: [SSV Embedded Systems] DIL/Net-PC 1486 (dnp-1486) Status: unknown */ /* include files ----------------------------------------------------------- */ #include "../comedidev.h" /* Some global definitions: the registers of the DNP ----------------------- */ /* */ /* For port A and B the mode register has bits corresponding to the output */ /* pins, where Bit-N = 0 -> input, Bit-N = 1 -> output. Note that bits */ /* 4 to 7 correspond to pin 0..3 for port C data register. Ensure that bits */ /* 0..3 remain unchanged! For details about Port C Mode Register see */ /* the remarks in dnp_insn_config() below. */ #define CSCIR 0x22 /* Chip Setup and Control Index Register */ #define CSCDR 0x23 /* Chip Setup and Control Data Register */ #define PAMR 0xa5 /* Port A Mode Register */ #define PADR 0xa9 /* Port A Data Register */ #define PBMR 0xa4 /* Port B Mode Register */ #define PBDR 0xa8 /* Port B Data Register */ #define PCMR 0xa3 /* Port C Mode Register */ #define PCDR 0xa7 /* Port C Data Register */ /* ------------------------------------------------------------------------- */ /* The insn_bits interface allows packed reading/writing of DIO channels. */ /* The comedi core can convert between insn_bits and insn_read/write, so you */ /* are able to use these instructions as well. */ /* ------------------------------------------------------------------------- */ static int dnp_dio_insn_bits(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { /* The insn data is a mask in data[0] and the new data in data[1], */ /* each channel cooresponding to a bit. */ /* Ports A and B are straight forward: each bit corresponds to an */ /* output pin with the same order. Port C is different: bits 0...3 */ /* correspond to bits 4...7 of the output register (PCDR). */ if (data[0]) { outb(PADR, CSCIR); outb((inb(CSCDR) & ~(u8) (data[0] & 0x0000FF)) | (u8) (data[1] & 0x0000FF), CSCDR); outb(PBDR, CSCIR); outb((inb(CSCDR) & ~(u8) ((data[0] & 0x00FF00) >> 8)) | (u8) ((data[1] & 0x00FF00) >> 8), CSCDR); outb(PCDR, CSCIR); outb((inb(CSCDR) & ~(u8) ((data[0] & 0x0F0000) >> 12)) | (u8) ((data[1] & 0x0F0000) >> 12), CSCDR); } /* on return, data[1] contains the value of the digital input lines. */ outb(PADR, CSCIR); data[1] = inb(CSCDR); outb(PBDR, CSCIR); data[1] += inb(CSCDR) << 8; outb(PCDR, CSCIR); data[1] += ((inb(CSCDR) & 0xF0) << 12); return insn->n; } /* ------------------------------------------------------------------------- */ /* Configure the direction of the bidirectional digital i/o pins. chanspec */ /* contains the channel to be changed and data[0] contains either */ /* COMEDI_INPUT or COMEDI_OUTPUT. */ /* ------------------------------------------------------------------------- */ static int dnp_dio_insn_config(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { u8 register_buffer; /* reduces chanspec to lower 16 bits */ int chan = CR_CHAN(insn->chanspec); switch (data[0]) { case INSN_CONFIG_DIO_OUTPUT: case INSN_CONFIG_DIO_INPUT: break; case INSN_CONFIG_DIO_QUERY: data[1] = (inb(CSCDR) & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT; return insn->n; break; default: return -EINVAL; break; } /* Test: which port does the channel belong to? */ /* We have to pay attention with port C: this is the meaning of PCMR: */ /* Bit in PCMR: 7 6 5 4 3 2 1 0 */ /* Corresponding port C pin: d 3 d 2 d 1 d 0 d= don't touch */ if ((chan >= 0) && (chan <= 7)) { /* this is port A */ outb(PAMR, CSCIR); } else if ((chan >= 8) && (chan <= 15)) { /* this is port B */ chan -= 8; outb(PBMR, CSCIR); } else if ((chan >= 16) && (chan <= 19)) { /* this is port C; multiplication with 2 brings bits into */ /* correct position for PCMR! */ chan -= 16; chan *= 2; outb(PCMR, CSCIR); } else { return -EINVAL; } /* read 'old' direction of the port and set bits (out=1, in=0) */ register_buffer = inb(CSCDR); if (data[0] == COMEDI_OUTPUT) register_buffer |= (1 << chan); else register_buffer &= ~(1 << chan); outb(register_buffer, CSCDR); return 1; } static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it) { struct comedi_subdevice *s; int ret; ret = comedi_alloc_subdevices(dev, 1); if (ret) return ret; s = &dev->subdevices[0]; /* digital i/o subdevice */ s->type = COMEDI_SUBD_DIO; s->subdev_flags = SDF_READABLE | SDF_WRITABLE; s->n_chan = 20; s->maxdata = 1; s->range_table = &range_digital; s->insn_bits = dnp_dio_insn_bits; s->insn_config = dnp_dio_insn_config; /* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always * allocated for the primary 8259, so we don't need to allocate them * ourselves. */ /* configure all ports as input (default) */ outb(PAMR, CSCIR); outb(0x00, CSCDR); outb(PBMR, CSCIR); outb(0x00, CSCDR); outb(PCMR, CSCIR); outb((inb(CSCDR) & 0xAA), CSCDR); dev_info(dev->class_dev, "%s: attached\n", dev->board_name); return 1; } static void dnp_detach(struct comedi_device *dev) { outb(PAMR, CSCIR); outb(0x00, CSCDR); outb(PBMR, CSCIR); outb(0x00, CSCDR); outb(PCMR, CSCIR); outb((inb(CSCDR) & 0xAA), CSCDR); } static struct comedi_driver dnp_driver = { .driver_name = "dnp-1486", .module = THIS_MODULE, .attach = dnp_attach, .detach = dnp_detach, }; module_comedi_driver(dnp_driver); MODULE_AUTHOR("Comedi http://www.comedi.org"); MODULE_DESCRIPTION("Comedi low-level driver"); MODULE_LICENSE("GPL");