diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/ssv_dnp.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/ssv_dnp.c | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/ssv_dnp.c b/drivers/staging/comedi/drivers/ssv_dnp.c new file mode 100644 index 000000000000..1628d216cdd4 --- /dev/null +++ b/drivers/staging/comedi/drivers/ssv_dnp.c @@ -0,0 +1,311 @@ +/* + 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; +}; + +static const struct dnp_board dnp_boards[] = { /* we only support one DNP 'board' */ + { /* variant at the moment */ + 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:sizeof(dnp_boards) / sizeof(struct dnp_board), +}; + +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("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("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; + + int chan = CR_CHAN(insn->chanspec); /* reduces chanspec to lower 16 bits */ + + 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; + +} |