| /* |
| comedi/drivers/ssv_dnp.c |
| generic comedi driver for SSV Embedded Systems' DIL/Net-PCs |
| Copyright (C) 2001 Robert Schwebel <robert@schwebel.de> |
| |
| 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: ssv_dnp |
| Description: SSV Embedded Systems DIL/Net-PC |
| Author: Robert Schwebel <robert@schwebel.de> |
| 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 */ |
| |
| /* This data structure holds information about the supported boards -------- */ |
| |
| struct dnp_board { |
| const char *name; |
| int ai_chans; |
| int ai_bits; |
| int have_dio; |
| }; |
| |
| /* We only support one DNP 'board' variant at the moment */ |
| static const struct dnp_board dnp_boards[] = { |
| { |
| .name = "dnp-1486", |
| .ai_chans = 16, |
| .ai_bits = 12, |
| .have_dio = 1, |
| }, |
| }; |
| |
| /* Useful for shorthand access to the particular board structure ----------- */ |
| #define thisboard ((const struct dnp_board *)dev->board_ptr) |
| |
| /* This structure is for data unique to the DNP driver --------------------- */ |
| struct dnp_private_data { |
| |
| }; |
| |
| /* Shorthand macro for faster access to the private data ------------------- */ |
| #define devpriv ((dnp_private *)dev->private) |
| |
| /* ------------------------------------------------------------------------- */ |
| /* The struct comedi_driver structure tells the Comedi core module which */ |
| /* functions to call to configure/deconfigure (attach/detach) the board, and */ |
| /* also about the kernel module that contains the device code. */ |
| /* */ |
| /* In the following section we define the API of this driver. */ |
| /* ------------------------------------------------------------------------- */ |
| |
| static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it); |
| static int dnp_detach(struct comedi_device *dev); |
| |
| static struct comedi_driver driver_dnp = { |
| .driver_name = "ssv_dnp", |
| .module = THIS_MODULE, |
| .attach = dnp_attach, |
| .detach = dnp_detach, |
| .board_name = &dnp_boards[0].name, |
| /* only necessary for non-PnP devs */ |
| .offset = sizeof(struct dnp_board), /* like ISA-PnP, PCI or PCMCIA */ |
| .num_names = ARRAY_SIZE(dnp_boards), |
| }; |
| |
| COMEDI_INITCLEANUP(driver_dnp); |
| |
| static int dnp_dio_insn_bits(struct comedi_device *dev, |
| struct comedi_subdevice *s, |
| struct comedi_insn *insn, unsigned int *data); |
| |
| static int dnp_dio_insn_config(struct comedi_device *dev, |
| struct comedi_subdevice *s, |
| struct comedi_insn *insn, unsigned int *data); |
| |
| /* ------------------------------------------------------------------------- */ |
| /* Attach is called by comedi core to configure the driver for a particular */ |
| /* board. If you specified a board_name array in the driver structure, */ |
| /* dev->board_ptr contains that address. */ |
| /* ------------------------------------------------------------------------- */ |
| |
| static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
| { |
| |
| struct comedi_subdevice *s; |
| |
| printk(KERN_INFO "comedi%d: dnp: ", dev->minor); |
| |
| /* Autoprobing: this should find out which board we have. Currently */ |
| /* only the 1486 board is supported and autoprobing is not */ |
| /* implemented :-) */ |
| /* dev->board_ptr = dnp_probe(dev); */ |
| |
| /* Initialize the name of the board. */ |
| /* We can use the "thisboard" macro now. */ |
| dev->board_name = thisboard->name; |
| |
| /* Allocate the private structure area. alloc_private() is a */ |
| /* convenient macro defined in comedidev.h. */ |
| if (alloc_private(dev, sizeof(struct dnp_private_data)) < 0) |
| return -ENOMEM; |
| |
| /* Allocate the subdevice structures. alloc_subdevice() is a */ |
| /* convenient macro defined in comedidev.h. */ |
| |
| if (alloc_subdevices(dev, 1) < 0) |
| return -ENOMEM; |
| |
| 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; |
| |
| printk("attached\n"); |
| |
| /* 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); |
| |
| return 1; |
| |
| } |
| |
| /* ------------------------------------------------------------------------- */ |
| /* detach is called to deconfigure a device. It should deallocate the */ |
| /* resources. This function is also called when _attach() fails, so it */ |
| /* should be careful not to release resources that were not necessarily */ |
| /* allocated by _attach(). dev->private and dev->subdevices are */ |
| /* deallocated automatically by the core. */ |
| /* ------------------------------------------------------------------------- */ |
| |
| static int dnp_detach(struct comedi_device *dev) |
| { |
| |
| /* 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); |
| |
| /* announce that we are finished */ |
| printk(KERN_INFO "comedi%d: dnp: remove\n", dev->minor); |
| |
| return 0; |
| |
| } |
| |
| /* ------------------------------------------------------------------------- */ |
| /* 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) |
| { |
| |
| if (insn->n != 2) |
| return -EINVAL; /* insn uses data[0] and data[1] */ |
| |
| /* 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[0] = inb(CSCDR); |
| outb(PBDR, CSCIR); |
| data[0] += inb(CSCDR) << 8; |
| outb(PCDR, CSCIR); |
| data[0] += ((inb(CSCDR) & 0xF0) << 12); |
| |
| return 2; |
| |
| } |
| |
| /* ------------------------------------------------------------------------- */ |
| /* 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; |
| |
| } |
