From 413c7af88e8c0ec6cf7cb7cf22af8d9bc57ce20a Mon Sep 17 00:00:00 2001 From: David Schleef Date: Fri, 14 Nov 2008 15:03:44 -0800 Subject: Staging: comedi: add comedi_parport driver From: David Schleef This adds the comedi_parport driver to the kernel tree From: David Schleef Cc: Frank Mori Hess Cc: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/Makefile | 1 drivers/staging/comedi/drivers/comedi_parport.c | 387 ++++++++++++++++++++++++ 2 files changed, 388 insertions(+) --- /dev/null +++ b/drivers/staging/comedi/drivers/comedi_parport.c @@ -0,0 +1,387 @@ +/* + comedi/drivers/comedi_parport.c + hardware driver for standard parallel port + + COMEDI - Linux Control and Measurement Device Interface + Copyright (C) 1998,2001 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: comedi_parport +Description: Standard PC parallel port +Author: ds +Status: works in immediate mode +Devices: [standard] parallel port (comedi_parport) +Updated: Tue, 30 Apr 2002 21:11:45 -0700 + +A cheap and easy way to get a few more digital I/O lines. Steal +additional parallel ports from old computers or your neighbors' +computers. + +Option list: + 0: I/O port base for the parallel port. + 1: IRQ + +Parallel Port Lines: + +pin subdev chan aka +--- ------ ---- --- +1 2 0 strobe +2 0 0 data 0 +3 0 1 data 1 +4 0 2 data 2 +5 0 3 data 3 +6 0 4 data 4 +7 0 5 data 5 +8 0 6 data 6 +9 0 7 data 7 +10 1 3 acknowledge +11 1 4 busy +12 1 2 output +13 1 1 printer selected +14 2 1 auto LF +15 1 0 error +16 2 2 init +17 2 3 select printer +18-25 ground + +Notes: + +Subdevices 0 is digital I/O, subdevice 1 is digital input, and +subdevice 2 is digital output. Unlike other Comedi devices, +subdevice 0 defaults to output. + +Pins 13 and 14 are inverted once by Comedi and once by the +hardware, thus cancelling the effect. + +Pin 1 is a strobe, thus acts like one. There's no way in software +to change this, at least on a standard parallel port. + +Subdevice 3 pretends to be a digital input subdevice, but it always +returns 0 when read. However, if you run a command with +scan_begin_src=TRIG_EXT, it uses pin 10 as a external triggering +pin, which can be used to wake up tasks. +*/ +/* + see http://www.beyondlogic.org/ for information. + or http://www.linux-magazin.de/ausgabe/1999/10/IO/io.html + */ + +#include "../comedidev.h" +#include + +#define PARPORT_SIZE 3 + +#define PARPORT_A 0 +#define PARPORT_B 1 +#define PARPORT_C 2 + +static int parport_attach(comedi_device * dev, comedi_devconfig * it); +static int parport_detach(comedi_device * dev); +static comedi_driver driver_parport = { + driver_name:"comedi_parport", + module:THIS_MODULE, + attach:parport_attach, + detach:parport_detach, +}; + +COMEDI_INITCLEANUP(driver_parport); + +typedef struct parport_private_struct { + unsigned int a_data; + unsigned int c_data; + int enable_irq; +} parport_private; +#define devpriv ((parport_private *)(dev->private)) + +static int parport_insn_a(comedi_device * dev, comedi_subdevice * s, + comedi_insn * insn, lsampl_t * data) +{ + if (data[0]) { + devpriv->a_data &= ~data[0]; + devpriv->a_data |= (data[0] & data[1]); + + outb(devpriv->a_data, dev->iobase + PARPORT_A); + } + + data[1] = inb(dev->iobase + PARPORT_A); + + return 2; +} + +static int parport_insn_config_a(comedi_device * dev, comedi_subdevice * s, + comedi_insn * insn, lsampl_t * data) +{ + if (data[0]) { + s->io_bits = 0xff; + devpriv->c_data &= ~(1 << 5); + } else { + s->io_bits = 0; + devpriv->c_data |= (1 << 5); + } + outb(devpriv->c_data, dev->iobase + PARPORT_C); + + return 1; +} + +static int parport_insn_b(comedi_device * dev, comedi_subdevice * s, + comedi_insn * insn, lsampl_t * data) +{ + if (data[0]) { + // should writes be ignored? + } + + data[1] = (inb(dev->iobase + PARPORT_B) >> 3); + + return 2; +} + +static int parport_insn_c(comedi_device * dev, comedi_subdevice * s, + comedi_insn * insn, lsampl_t * data) +{ + data[0] &= 0x0f; + if (data[0]) { + devpriv->c_data &= ~data[0]; + devpriv->c_data |= (data[0] & data[1]); + + outb(devpriv->c_data, dev->iobase + PARPORT_C); + } + + data[1] = devpriv->c_data & 0xf; + + return 2; +} + +static int parport_intr_insn(comedi_device * dev, comedi_subdevice * s, + comedi_insn * insn, lsampl_t * data) +{ + if (insn->n < 1) + return -EINVAL; + + data[1] = 0; + return 2; +} + +static int parport_intr_cmdtest(comedi_device * dev, comedi_subdevice * s, + comedi_cmd * cmd) +{ + int err = 0; + int tmp; + + /* step 1 */ + + tmp = cmd->start_src; + cmd->start_src &= TRIG_NOW; + if (!cmd->start_src || tmp != cmd->start_src) + err++; + + tmp = cmd->scan_begin_src; + cmd->scan_begin_src &= TRIG_EXT; + if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) + err++; + + tmp = cmd->convert_src; + cmd->convert_src &= TRIG_FOLLOW; + if (!cmd->convert_src || tmp != cmd->convert_src) + err++; + + tmp = cmd->scan_end_src; + cmd->scan_end_src &= TRIG_COUNT; + if (!cmd->scan_end_src || tmp != cmd->scan_end_src) + err++; + + tmp = cmd->stop_src; + cmd->stop_src &= TRIG_NONE; + if (!cmd->stop_src || tmp != cmd->stop_src) + err++; + + if (err) + return 1; + + /* step 2: ignored */ + + if (err) + return 2; + + /* step 3: */ + + if (cmd->start_arg != 0) { + cmd->start_arg = 0; + err++; + } + if (cmd->scan_begin_arg != 0) { + cmd->scan_begin_arg = 0; + err++; + } + if (cmd->convert_arg != 0) { + cmd->convert_arg = 0; + err++; + } + if (cmd->scan_end_arg != 1) { + cmd->scan_end_arg = 1; + err++; + } + if (cmd->stop_arg != 0) { + cmd->stop_arg = 0; + err++; + } + + if (err) + return 3; + + /* step 4: ignored */ + + if (err) + return 4; + + return 0; +} + +static int parport_intr_cmd(comedi_device * dev, comedi_subdevice * s) +{ + devpriv->c_data |= 0x10; + outb(devpriv->c_data, dev->iobase + PARPORT_C); + + devpriv->enable_irq = 1; + + return 0; +} + +static int parport_intr_cancel(comedi_device * dev, comedi_subdevice * s) +{ + printk("parport_intr_cancel()\n"); + + devpriv->c_data &= ~0x10; + outb(devpriv->c_data, dev->iobase + PARPORT_C); + + devpriv->enable_irq = 0; + + return 0; +} + +static irqreturn_t parport_interrupt(int irq, void *d PT_REGS_ARG) +{ + comedi_device *dev = d; + comedi_subdevice *s = dev->subdevices + 3; + + if (!devpriv->enable_irq) { + printk("comedi_parport: bogus irq, ignored\n"); + return IRQ_NONE; + } + + comedi_buf_put(s->async, 0); + s->async->events |= COMEDI_CB_BLOCK | COMEDI_CB_EOS; + + comedi_event(dev, s); + return IRQ_HANDLED; +} + +static int parport_attach(comedi_device * dev, comedi_devconfig * it) +{ + int ret; + unsigned int irq; + unsigned long iobase; + comedi_subdevice *s; + + iobase = it->options[0]; + printk("comedi%d: parport: 0x%04lx ", dev->minor, iobase); + if (!request_region(iobase, PARPORT_SIZE, "parport (comedi)")) { + printk("I/O port conflict\n"); + return -EIO; + } + dev->iobase = iobase; + + irq = it->options[1]; + if (irq) { + printk(" irq=%u", irq); + ret = comedi_request_irq(irq, parport_interrupt, 0, + "comedi_parport", dev); + if (ret < 0) { + printk(" irq not available\n"); + return -EINVAL; + } + dev->irq = irq; + } + dev->board_name = "parport"; + + if ((ret = alloc_subdevices(dev, 4)) < 0) + return ret; + if ((ret = alloc_private(dev, sizeof(parport_private))) < 0) + return ret; + + s = dev->subdevices + 0; + s->type = COMEDI_SUBD_DIO; + s->subdev_flags = SDF_READABLE | SDF_WRITABLE; + s->n_chan = 8; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = parport_insn_a; + s->insn_config = parport_insn_config_a; + + s = dev->subdevices + 1; + s->type = COMEDI_SUBD_DI; + s->subdev_flags = SDF_READABLE; + s->n_chan = 5; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = parport_insn_b; + + s = dev->subdevices + 2; + s->type = COMEDI_SUBD_DO; + s->subdev_flags = SDF_WRITABLE; + s->n_chan = 4; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = parport_insn_c; + + s = dev->subdevices + 3; + if (irq) { + dev->read_subdev = s; + s->type = COMEDI_SUBD_DI; + s->subdev_flags = SDF_READABLE | SDF_CMD_READ; + s->n_chan = 1; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = parport_intr_insn; + s->do_cmdtest = parport_intr_cmdtest; + s->do_cmd = parport_intr_cmd; + s->cancel = parport_intr_cancel; + } else { + s->type = COMEDI_SUBD_UNUSED; + } + + devpriv->a_data = 0; + outb(devpriv->a_data, dev->iobase + PARPORT_A); + devpriv->c_data = 0; + outb(devpriv->c_data, dev->iobase + PARPORT_C); + + printk("\n"); + return 1; +} + +static int parport_detach(comedi_device * dev) +{ + printk("comedi%d: parport: remove\n", dev->minor); + + if (dev->iobase) + release_region(dev->iobase, PARPORT_SIZE); + + if (dev->irq) + comedi_free_irq(dev->irq, dev); + + return 0; +} --- a/drivers/staging/comedi/drivers/Makefile +++ b/drivers/staging/comedi/drivers/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_COMEDI) += comedi_fc.o obj-$(CONFIG_COMEDI) += comedi_bond.o obj-$(CONFIG_COMEDI) += comedi_test.o +obj-$(CONFIG_COMEDI) += comedi_parport.o # Comedi PCI drivers obj-$(CONFIG_COMEDI_PCI_DRIVERS) += mite.o