ssv_dnp.c revision 0a85b6f0ab0d2edb0d41b32697111ce0e4f43496
1/* 2 comedi/drivers/ssv_dnp.c 3 generic comedi driver for SSV Embedded Systems' DIL/Net-PCs 4 Copyright (C) 2001 Robert Schwebel <robert@schwebel.de> 5 6 COMEDI - Linux Control and Measurement Device Interface 7 Copyright (C) 2000 David A. Schleef <ds@schleef.org> 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 2 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 23*/ 24/* 25Driver: ssv_dnp 26Description: SSV Embedded Systems DIL/Net-PC 27Author: Robert Schwebel <robert@schwebel.de> 28Devices: [SSV Embedded Systems] DIL/Net-PC 1486 (dnp-1486) 29Status: unknown 30*/ 31 32/* include files ----------------------------------------------------------- */ 33 34#include "../comedidev.h" 35 36/* Some global definitions: the registers of the DNP ----------------------- */ 37/* */ 38/* For port A and B the mode register has bits corresponding to the output */ 39/* pins, where Bit-N = 0 -> input, Bit-N = 1 -> output. Note that bits */ 40/* 4 to 7 correspond to pin 0..3 for port C data register. Ensure that bits */ 41/* 0..3 remain unchanged! For details about Port C Mode Register see */ 42/* the remarks in dnp_insn_config() below. */ 43 44#define CSCIR 0x22 /* Chip Setup and Control Index Register */ 45#define CSCDR 0x23 /* Chip Setup and Control Data Register */ 46#define PAMR 0xa5 /* Port A Mode Register */ 47#define PADR 0xa9 /* Port A Data Register */ 48#define PBMR 0xa4 /* Port B Mode Register */ 49#define PBDR 0xa8 /* Port B Data Register */ 50#define PCMR 0xa3 /* Port C Mode Register */ 51#define PCDR 0xa7 /* Port C Data Register */ 52 53/* This data structure holds information about the supported boards -------- */ 54 55struct dnp_board { 56 const char *name; 57 int ai_chans; 58 int ai_bits; 59 int have_dio; 60}; 61 62static const struct dnp_board dnp_boards[] = { /* we only support one DNP 'board' */ 63 { /* variant at the moment */ 64 .name = "dnp-1486", 65 .ai_chans = 16, 66 .ai_bits = 12, 67 .have_dio = 1, 68 }, 69}; 70 71/* Useful for shorthand access to the particular board structure ----------- */ 72#define thisboard ((const struct dnp_board *)dev->board_ptr) 73 74/* This structure is for data unique to the DNP driver --------------------- */ 75struct dnp_private_data { 76 77}; 78 79/* Shorthand macro for faster access to the private data ------------------- */ 80#define devpriv ((dnp_private *)dev->private) 81 82/* ------------------------------------------------------------------------- */ 83/* The struct comedi_driver structure tells the Comedi core module which functions */ 84/* to call to configure/deconfigure (attach/detach) the board, and also */ 85/* about the kernel module that contains the device code. */ 86/* */ 87/* In the following section we define the API of this driver. */ 88/* ------------------------------------------------------------------------- */ 89 90static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it); 91static int dnp_detach(struct comedi_device *dev); 92 93static struct comedi_driver driver_dnp = { 94 .driver_name = "ssv_dnp", 95 .module = THIS_MODULE, 96 .attach = dnp_attach, 97 .detach = dnp_detach, 98 .board_name = &dnp_boards[0].name, 99 /* only necessary for non-PnP devs */ 100 .offset = sizeof(struct dnp_board), /* like ISA-PnP, PCI or PCMCIA. */ 101 .num_names = ARRAY_SIZE(dnp_boards), 102}; 103 104COMEDI_INITCLEANUP(driver_dnp); 105 106static int dnp_dio_insn_bits(struct comedi_device *dev, 107 struct comedi_subdevice *s, 108 struct comedi_insn *insn, unsigned int *data); 109 110static int dnp_dio_insn_config(struct comedi_device *dev, 111 struct comedi_subdevice *s, 112 struct comedi_insn *insn, unsigned int *data); 113 114/* ------------------------------------------------------------------------- */ 115/* Attach is called by comedi core to configure the driver for a particular */ 116/* board. If you specified a board_name array in the driver structure, */ 117/* dev->board_ptr contains that address. */ 118/* ------------------------------------------------------------------------- */ 119 120static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it) 121{ 122 123 struct comedi_subdevice *s; 124 125 printk("comedi%d: dnp: ", dev->minor); 126 127 /* Autoprobing: this should find out which board we have. Currently only */ 128 /* the 1486 board is supported and autoprobing is not implemented :-) */ 129 /* dev->board_ptr = dnp_probe(dev); */ 130 131 /* Initialize the name of the board. We can use the "thisboard" macro now. */ 132 dev->board_name = thisboard->name; 133 134 /* Allocate the private structure area. alloc_private() is a convenient */ 135 /* macro defined in comedidev.h. */ 136 if (alloc_private(dev, sizeof(struct dnp_private_data)) < 0) 137 return -ENOMEM; 138 139 /* Allocate the subdevice structures. alloc_subdevice() is a convenient */ 140 /* macro defined in comedidev.h. */ 141 142 if (alloc_subdevices(dev, 1) < 0) 143 return -ENOMEM; 144 145 s = dev->subdevices + 0; 146 /* digital i/o subdevice */ 147 s->type = COMEDI_SUBD_DIO; 148 s->subdev_flags = SDF_READABLE | SDF_WRITABLE; 149 s->n_chan = 20; 150 s->maxdata = 1; 151 s->range_table = &range_digital; 152 s->insn_bits = dnp_dio_insn_bits; 153 s->insn_config = dnp_dio_insn_config; 154 155 printk("attached\n"); 156 157 /* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always 158 * allocated for the primary 8259, so we don't need to allocate them 159 * ourselves. */ 160 161 /* configure all ports as input (default) */ 162 outb(PAMR, CSCIR); 163 outb(0x00, CSCDR); 164 outb(PBMR, CSCIR); 165 outb(0x00, CSCDR); 166 outb(PCMR, CSCIR); 167 outb((inb(CSCDR) & 0xAA), CSCDR); 168 169 return 1; 170 171} 172 173/* ------------------------------------------------------------------------- */ 174/* detach is called to deconfigure a device. It should deallocate the */ 175/* resources. This function is also called when _attach() fails, so it */ 176/* should be careful not to release resources that were not necessarily */ 177/* allocated by _attach(). dev->private and dev->subdevices are */ 178/* deallocated automatically by the core. */ 179/* ------------------------------------------------------------------------- */ 180 181static int dnp_detach(struct comedi_device *dev) 182{ 183 184 /* configure all ports as input (default) */ 185 outb(PAMR, CSCIR); 186 outb(0x00, CSCDR); 187 outb(PBMR, CSCIR); 188 outb(0x00, CSCDR); 189 outb(PCMR, CSCIR); 190 outb((inb(CSCDR) & 0xAA), CSCDR); 191 192 /* announce that we are finished */ 193 printk("comedi%d: dnp: remove\n", dev->minor); 194 195 return 0; 196 197} 198 199/* ------------------------------------------------------------------------- */ 200/* The insn_bits interface allows packed reading/writing of DIO channels. */ 201/* The comedi core can convert between insn_bits and insn_read/write, so you */ 202/* are able to use these instructions as well. */ 203/* ------------------------------------------------------------------------- */ 204 205static int dnp_dio_insn_bits(struct comedi_device *dev, 206 struct comedi_subdevice *s, 207 struct comedi_insn *insn, unsigned int *data) 208{ 209 210 if (insn->n != 2) 211 return -EINVAL; /* insn uses data[0] and data[1] */ 212 213 /* The insn data is a mask in data[0] and the new data in data[1], each */ 214 /* channel cooresponding to a bit. */ 215 216 /* Ports A and B are straight forward: each bit corresponds to an output */ 217 /* pin with the same order. Port C is different: bits 0...3 correspond to */ 218 /* bits 4...7 of the output register (PCDR). */ 219 220 if (data[0]) { 221 222 outb(PADR, CSCIR); 223 outb((inb(CSCDR) 224 & ~(u8) (data[0] & 0x0000FF)) 225 | (u8) (data[1] & 0x0000FF), CSCDR); 226 227 outb(PBDR, CSCIR); 228 outb((inb(CSCDR) 229 & ~(u8) ((data[0] & 0x00FF00) >> 8)) 230 | (u8) ((data[1] & 0x00FF00) >> 8), CSCDR); 231 232 outb(PCDR, CSCIR); 233 outb((inb(CSCDR) 234 & ~(u8) ((data[0] & 0x0F0000) >> 12)) 235 | (u8) ((data[1] & 0x0F0000) >> 12), CSCDR); 236 } 237 238 /* on return, data[1] contains the value of the digital input lines. */ 239 outb(PADR, CSCIR); 240 data[0] = inb(CSCDR); 241 outb(PBDR, CSCIR); 242 data[0] += inb(CSCDR) << 8; 243 outb(PCDR, CSCIR); 244 data[0] += ((inb(CSCDR) & 0xF0) << 12); 245 246 return 2; 247 248} 249 250/* ------------------------------------------------------------------------- */ 251/* Configure the direction of the bidirectional digital i/o pins. chanspec */ 252/* contains the channel to be changed and data[0] contains either */ 253/* COMEDI_INPUT or COMEDI_OUTPUT. */ 254/* ------------------------------------------------------------------------- */ 255 256static int dnp_dio_insn_config(struct comedi_device *dev, 257 struct comedi_subdevice *s, 258 struct comedi_insn *insn, unsigned int *data) 259{ 260 261 u8 register_buffer; 262 263 int chan = CR_CHAN(insn->chanspec); /* reduces chanspec to lower 16 bits */ 264 265 switch (data[0]) { 266 case INSN_CONFIG_DIO_OUTPUT: 267 case INSN_CONFIG_DIO_INPUT: 268 break; 269 case INSN_CONFIG_DIO_QUERY: 270 data[1] = 271 (inb(CSCDR) & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT; 272 return insn->n; 273 break; 274 default: 275 return -EINVAL; 276 break; 277 } 278 /* Test: which port does the channel belong to? */ 279 280 /* We have to pay attention with port C: this is the meaning of PCMR: */ 281 /* Bit in PCMR: 7 6 5 4 3 2 1 0 */ 282 /* Corresponding port C pin: d 3 d 2 d 1 d 0 d= don't touch */ 283 284 if ((chan >= 0) && (chan <= 7)) { 285 /* this is port A */ 286 outb(PAMR, CSCIR); 287 } else if ((chan >= 8) && (chan <= 15)) { 288 /* this is port B */ 289 chan -= 8; 290 outb(PBMR, CSCIR); 291 } else if ((chan >= 16) && (chan <= 19)) { 292 /* this is port C; multiplication with 2 brings bits into correct */ 293 /* position for PCMR! */ 294 chan -= 16; 295 chan *= 2; 296 outb(PCMR, CSCIR); 297 } else { 298 return -EINVAL; 299 } 300 301 /* read 'old' direction of the port and set bits (out=1, in=0) */ 302 register_buffer = inb(CSCDR); 303 if (data[0] == COMEDI_OUTPUT) { 304 register_buffer |= (1 << chan); 305 } else { 306 register_buffer &= ~(1 << chan); 307 } 308 outb(register_buffer, CSCDR); 309 310 return 1; 311 312} 313