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V4L/DVB: staging/lirc: add lirc_parallel driver
Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jarod Wilson
Mauro Carvalho Chehab
parent
c147f9078a
commit
805a896665
2 changed files with 731 additions and 0 deletions
705
drivers/staging/lirc/lirc_parallel.c
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705
drivers/staging/lirc/lirc_parallel.c
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/*
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* lirc_parallel.c
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*
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* lirc_parallel - device driver for infra-red signal receiving and
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* transmitting unit built by the author
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*
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* Copyright (C) 1998 Christoph Bartelmus <lirc@bartelmus.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*** Includes ***/
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#ifdef CONFIG_SMP
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#error "--- Sorry, this driver is not SMP safe. ---"
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#endif
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/ioport.h>
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#include <linux/time.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/signal.h>
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#include <linux/irq.h>
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#include <linux/uaccess.h>
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#include <asm/div64.h>
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#include <linux/poll.h>
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#include <linux/parport.h>
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#include <media/lirc.h>
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#include <media/lirc_dev.h>
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#include "lirc_parallel.h"
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#define LIRC_DRIVER_NAME "lirc_parallel"
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#ifndef LIRC_IRQ
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#define LIRC_IRQ 7
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#endif
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#ifndef LIRC_PORT
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#define LIRC_PORT 0x378
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#endif
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#ifndef LIRC_TIMER
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#define LIRC_TIMER 65536
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#endif
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/*** Global Variables ***/
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static int debug;
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static int check_pselecd;
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unsigned int irq = LIRC_IRQ;
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unsigned int io = LIRC_PORT;
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#ifdef LIRC_TIMER
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unsigned int timer;
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unsigned int default_timer = LIRC_TIMER;
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#endif
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#define RBUF_SIZE (256) /* this must be a power of 2 larger than 1 */
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static int rbuf[RBUF_SIZE];
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DECLARE_WAIT_QUEUE_HEAD(lirc_wait);
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unsigned int rptr;
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unsigned int wptr;
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unsigned int lost_irqs;
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int is_open;
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struct parport *pport;
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struct pardevice *ppdevice;
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int is_claimed;
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unsigned int tx_mask = 1;
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/*** Internal Functions ***/
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static unsigned int in(int offset)
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{
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switch (offset) {
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case LIRC_LP_BASE:
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return parport_read_data(pport);
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case LIRC_LP_STATUS:
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return parport_read_status(pport);
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case LIRC_LP_CONTROL:
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return parport_read_control(pport);
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}
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return 0; /* make compiler happy */
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}
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static void out(int offset, int value)
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{
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switch (offset) {
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case LIRC_LP_BASE:
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parport_write_data(pport, value);
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break;
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case LIRC_LP_CONTROL:
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parport_write_control(pport, value);
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break;
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case LIRC_LP_STATUS:
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printk(KERN_INFO "%s: attempt to write to status register\n",
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LIRC_DRIVER_NAME);
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break;
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}
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}
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static unsigned int lirc_get_timer(void)
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{
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return in(LIRC_PORT_TIMER) & LIRC_PORT_TIMER_BIT;
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}
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static unsigned int lirc_get_signal(void)
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{
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return in(LIRC_PORT_SIGNAL) & LIRC_PORT_SIGNAL_BIT;
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}
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static void lirc_on(void)
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{
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out(LIRC_PORT_DATA, tx_mask);
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}
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static void lirc_off(void)
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{
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out(LIRC_PORT_DATA, 0);
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}
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static unsigned int init_lirc_timer(void)
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{
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struct timeval tv, now;
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unsigned int level, newlevel, timeelapsed, newtimer;
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int count = 0;
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do_gettimeofday(&tv);
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tv.tv_sec++; /* wait max. 1 sec. */
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level = lirc_get_timer();
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do {
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newlevel = lirc_get_timer();
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if (level == 0 && newlevel != 0)
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count++;
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level = newlevel;
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do_gettimeofday(&now);
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} while (count < 1000 && (now.tv_sec < tv.tv_sec
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|| (now.tv_sec == tv.tv_sec
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&& now.tv_usec < tv.tv_usec)));
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timeelapsed = ((now.tv_sec + 1 - tv.tv_sec)*1000000
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+ (now.tv_usec - tv.tv_usec));
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if (count >= 1000 && timeelapsed > 0) {
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if (default_timer == 0) {
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/* autodetect timer */
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newtimer = (1000000*count)/timeelapsed;
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printk(KERN_INFO "%s: %u Hz timer detected\n",
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LIRC_DRIVER_NAME, newtimer);
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return newtimer;
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} else {
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newtimer = (1000000*count)/timeelapsed;
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if (abs(newtimer - default_timer) > default_timer/10) {
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/* bad timer */
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printk(KERN_NOTICE "%s: bad timer: %u Hz\n",
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LIRC_DRIVER_NAME, newtimer);
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printk(KERN_NOTICE "%s: using default timer: "
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"%u Hz\n",
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LIRC_DRIVER_NAME, default_timer);
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return default_timer;
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} else {
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printk(KERN_INFO "%s: %u Hz timer detected\n",
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LIRC_DRIVER_NAME, newtimer);
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return newtimer; /* use detected value */
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}
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}
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} else {
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printk(KERN_NOTICE "%s: no timer detected\n", LIRC_DRIVER_NAME);
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return 0;
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}
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}
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static int lirc_claim(void)
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{
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if (parport_claim(ppdevice) != 0) {
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printk(KERN_WARNING "%s: could not claim port\n",
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LIRC_DRIVER_NAME);
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printk(KERN_WARNING "%s: waiting for port becoming available"
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"\n", LIRC_DRIVER_NAME);
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if (parport_claim_or_block(ppdevice) < 0) {
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printk(KERN_NOTICE "%s: could not claim port, giving"
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" up\n", LIRC_DRIVER_NAME);
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return 0;
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}
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}
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out(LIRC_LP_CONTROL, LP_PSELECP|LP_PINITP);
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is_claimed = 1;
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return 1;
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}
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/*** interrupt handler ***/
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static void rbuf_write(int signal)
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{
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unsigned int nwptr;
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nwptr = (wptr + 1) & (RBUF_SIZE - 1);
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if (nwptr == rptr) {
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/* no new signals will be accepted */
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lost_irqs++;
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printk(KERN_NOTICE "%s: buffer overrun\n", LIRC_DRIVER_NAME);
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return;
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}
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rbuf[wptr] = signal;
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wptr = nwptr;
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}
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static void irq_handler(void *blah)
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{
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struct timeval tv;
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static struct timeval lasttv;
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static int init;
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long signal;
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int data;
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unsigned int level, newlevel;
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unsigned int timeout;
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if (!module_refcount(THIS_MODULE))
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return;
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if (!is_claimed)
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return;
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#if 0
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/* disable interrupt */
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disable_irq(irq);
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out(LIRC_PORT_IRQ, in(LIRC_PORT_IRQ) & (~LP_PINTEN));
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#endif
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if (check_pselecd && (in(1) & LP_PSELECD))
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return;
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#ifdef LIRC_TIMER
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if (init) {
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do_gettimeofday(&tv);
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signal = tv.tv_sec - lasttv.tv_sec;
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if (signal > 15)
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/* really long time */
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data = PULSE_MASK;
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else
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data = (int) (signal*1000000 +
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tv.tv_usec - lasttv.tv_usec +
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LIRC_SFH506_DELAY);
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rbuf_write(data); /* space */
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} else {
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if (timer == 0) {
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/*
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* wake up; we'll lose this signal, but it will be
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* garbage if the device is turned on anyway
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*/
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timer = init_lirc_timer();
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/* enable_irq(irq); */
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return;
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}
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init = 1;
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}
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timeout = timer/10; /* timeout after 1/10 sec. */
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signal = 1;
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level = lirc_get_timer();
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do {
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newlevel = lirc_get_timer();
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if (level == 0 && newlevel != 0)
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signal++;
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level = newlevel;
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/* giving up */
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if (signal > timeout
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|| (check_pselecd && (in(1) & LP_PSELECD))) {
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signal = 0;
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printk(KERN_NOTICE "%s: timeout\n", LIRC_DRIVER_NAME);
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break;
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}
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} while (lirc_get_signal());
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if (signal != 0) {
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/* ajust value to usecs */
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unsigned long long helper;
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helper = ((unsigned long long) signal)*1000000;
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do_div(helper, timer);
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signal = (long) helper;
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if (signal > LIRC_SFH506_DELAY)
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data = signal - LIRC_SFH506_DELAY;
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else
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data = 1;
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rbuf_write(PULSE_BIT|data); /* pulse */
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}
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do_gettimeofday(&lasttv);
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#else
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/* add your code here */
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#endif
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wake_up_interruptible(&lirc_wait);
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/* enable interrupt */
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/*
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enable_irq(irq);
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out(LIRC_PORT_IRQ, in(LIRC_PORT_IRQ)|LP_PINTEN);
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*/
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}
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/*** file operations ***/
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static loff_t lirc_lseek(struct file *filep, loff_t offset, int orig)
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{
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return -ESPIPE;
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}
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static ssize_t lirc_read(struct file *filep, char *buf, size_t n, loff_t *ppos)
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{
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int result = 0;
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int count = 0;
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DECLARE_WAITQUEUE(wait, current);
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if (n % sizeof(int))
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return -EINVAL;
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add_wait_queue(&lirc_wait, &wait);
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set_current_state(TASK_INTERRUPTIBLE);
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while (count < n) {
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if (rptr != wptr) {
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if (copy_to_user(buf+count, (char *) &rbuf[rptr],
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sizeof(int))) {
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result = -EFAULT;
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break;
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}
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rptr = (rptr + 1) & (RBUF_SIZE - 1);
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count += sizeof(int);
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} else {
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if (filep->f_flags & O_NONBLOCK) {
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result = -EAGAIN;
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break;
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}
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if (signal_pending(current)) {
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result = -ERESTARTSYS;
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break;
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}
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schedule();
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set_current_state(TASK_INTERRUPTIBLE);
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}
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}
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remove_wait_queue(&lirc_wait, &wait);
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set_current_state(TASK_RUNNING);
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return count ? count : result;
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}
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static ssize_t lirc_write(struct file *filep, const char *buf, size_t n,
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loff_t *ppos)
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{
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int count;
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unsigned int i;
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unsigned int level, newlevel;
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unsigned long flags;
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int counttimer;
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int *wbuf;
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if (!is_claimed)
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return -EBUSY;
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count = n / sizeof(int);
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if (n % sizeof(int) || count % 2 == 0)
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return -EINVAL;
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wbuf = memdup_user(buf, n);
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if (IS_ERR(wbuf))
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return PTR_ERR(wbuf);
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#ifdef LIRC_TIMER
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if (timer == 0) {
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/* try again if device is ready */
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timer = init_lirc_timer();
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if (timer == 0)
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return -EIO;
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}
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/* adjust values from usecs */
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for (i = 0; i < count; i++) {
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unsigned long long helper;
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helper = ((unsigned long long) wbuf[i])*timer;
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do_div(helper, 1000000);
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wbuf[i] = (int) helper;
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}
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local_irq_save(flags);
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i = 0;
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while (i < count) {
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level = lirc_get_timer();
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counttimer = 0;
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lirc_on();
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do {
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newlevel = lirc_get_timer();
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if (level == 0 && newlevel != 0)
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counttimer++;
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level = newlevel;
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if (check_pselecd && (in(1) & LP_PSELECD)) {
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lirc_off();
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local_irq_restore(flags);
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return -EIO;
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}
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} while (counttimer < wbuf[i]);
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i++;
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lirc_off();
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if (i == count)
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break;
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counttimer = 0;
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do {
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newlevel = lirc_get_timer();
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if (level == 0 && newlevel != 0)
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counttimer++;
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level = newlevel;
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if (check_pselecd && (in(1) & LP_PSELECD)) {
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local_irq_restore(flags);
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return -EIO;
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}
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} while (counttimer < wbuf[i]);
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i++;
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}
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local_irq_restore(flags);
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#else
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/* place code that handles write without external timer here */
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#endif
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return n;
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}
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static unsigned int lirc_poll(struct file *file, poll_table *wait)
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{
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poll_wait(file, &lirc_wait, wait);
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if (rptr != wptr)
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return POLLIN | POLLRDNORM;
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return 0;
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}
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static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
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{
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int result;
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unsigned long features = LIRC_CAN_SET_TRANSMITTER_MASK |
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LIRC_CAN_SEND_PULSE | LIRC_CAN_REC_MODE2;
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unsigned long mode;
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unsigned int ivalue;
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switch (cmd) {
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case LIRC_GET_FEATURES:
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result = put_user(features, (unsigned long *) arg);
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if (result)
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return result;
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break;
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case LIRC_GET_SEND_MODE:
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result = put_user(LIRC_MODE_PULSE, (unsigned long *) arg);
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if (result)
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return result;
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break;
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case LIRC_GET_REC_MODE:
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result = put_user(LIRC_MODE_MODE2, (unsigned long *) arg);
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if (result)
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return result;
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break;
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case LIRC_SET_SEND_MODE:
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result = get_user(mode, (unsigned long *) arg);
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if (result)
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return result;
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if (mode != LIRC_MODE_PULSE)
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return -EINVAL;
|
||||
break;
|
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case LIRC_SET_REC_MODE:
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result = get_user(mode, (unsigned long *) arg);
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if (result)
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return result;
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if (mode != LIRC_MODE_MODE2)
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return -ENOSYS;
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break;
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case LIRC_SET_TRANSMITTER_MASK:
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result = get_user(ivalue, (unsigned int *) arg);
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if (result)
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return result;
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if ((ivalue & LIRC_PARALLEL_TRANSMITTER_MASK) != ivalue)
|
||||
return LIRC_PARALLEL_MAX_TRANSMITTERS;
|
||||
tx_mask = ivalue;
|
||||
break;
|
||||
default:
|
||||
return -ENOIOCTLCMD;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int lirc_open(struct inode *node, struct file *filep)
|
||||
{
|
||||
if (module_refcount(THIS_MODULE) || !lirc_claim())
|
||||
return -EBUSY;
|
||||
|
||||
parport_enable_irq(pport);
|
||||
|
||||
/* init read ptr */
|
||||
rptr = 0;
|
||||
wptr = 0;
|
||||
lost_irqs = 0;
|
||||
|
||||
is_open = 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int lirc_close(struct inode *node, struct file *filep)
|
||||
{
|
||||
if (is_claimed) {
|
||||
is_claimed = 0;
|
||||
parport_release(ppdevice);
|
||||
}
|
||||
is_open = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct file_operations lirc_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = lirc_lseek,
|
||||
.read = lirc_read,
|
||||
.write = lirc_write,
|
||||
.poll = lirc_poll,
|
||||
.unlocked_ioctl = lirc_ioctl,
|
||||
.open = lirc_open,
|
||||
.release = lirc_close
|
||||
};
|
||||
|
||||
static int set_use_inc(void *data)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void set_use_dec(void *data)
|
||||
{
|
||||
}
|
||||
|
||||
static struct lirc_driver driver = {
|
||||
.name = LIRC_DRIVER_NAME,
|
||||
.minor = -1,
|
||||
.code_length = 1,
|
||||
.sample_rate = 0,
|
||||
.data = NULL,
|
||||
.add_to_buf = NULL,
|
||||
.set_use_inc = set_use_inc,
|
||||
.set_use_dec = set_use_dec,
|
||||
.fops = &lirc_fops,
|
||||
.dev = NULL,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int pf(void *handle);
|
||||
static void kf(void *handle);
|
||||
|
||||
static struct timer_list poll_timer;
|
||||
static void poll_state(unsigned long ignored);
|
||||
|
||||
static void poll_state(unsigned long ignored)
|
||||
{
|
||||
printk(KERN_NOTICE "%s: time\n",
|
||||
LIRC_DRIVER_NAME);
|
||||
del_timer(&poll_timer);
|
||||
if (is_claimed)
|
||||
return;
|
||||
kf(NULL);
|
||||
if (!is_claimed) {
|
||||
printk(KERN_NOTICE "%s: could not claim port, giving up\n",
|
||||
LIRC_DRIVER_NAME);
|
||||
init_timer(&poll_timer);
|
||||
poll_timer.expires = jiffies + HZ;
|
||||
poll_timer.data = (unsigned long)current;
|
||||
poll_timer.function = poll_state;
|
||||
add_timer(&poll_timer);
|
||||
}
|
||||
}
|
||||
|
||||
static int pf(void *handle)
|
||||
{
|
||||
parport_disable_irq(pport);
|
||||
is_claimed = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void kf(void *handle)
|
||||
{
|
||||
if (!is_open)
|
||||
return;
|
||||
if (!lirc_claim())
|
||||
return;
|
||||
parport_enable_irq(pport);
|
||||
lirc_off();
|
||||
/* this is a bit annoying when you actually print...*/
|
||||
/*
|
||||
printk(KERN_INFO "%s: reclaimed port\n", LIRC_DRIVER_NAME);
|
||||
*/
|
||||
}
|
||||
|
||||
/*** module initialization and cleanup ***/
|
||||
|
||||
static int __init lirc_parallel_init(void)
|
||||
{
|
||||
pport = parport_find_base(io);
|
||||
if (pport == NULL) {
|
||||
printk(KERN_NOTICE "%s: no port at %x found\n",
|
||||
LIRC_DRIVER_NAME, io);
|
||||
return -ENXIO;
|
||||
}
|
||||
ppdevice = parport_register_device(pport, LIRC_DRIVER_NAME,
|
||||
pf, kf, irq_handler, 0, NULL);
|
||||
parport_put_port(pport);
|
||||
if (ppdevice == NULL) {
|
||||
printk(KERN_NOTICE "%s: parport_register_device() failed\n",
|
||||
LIRC_DRIVER_NAME);
|
||||
return -ENXIO;
|
||||
}
|
||||
if (parport_claim(ppdevice) != 0)
|
||||
goto skip_init;
|
||||
is_claimed = 1;
|
||||
out(LIRC_LP_CONTROL, LP_PSELECP|LP_PINITP);
|
||||
|
||||
#ifdef LIRC_TIMER
|
||||
if (debug)
|
||||
out(LIRC_PORT_DATA, tx_mask);
|
||||
|
||||
timer = init_lirc_timer();
|
||||
|
||||
#if 0 /* continue even if device is offline */
|
||||
if (timer == 0) {
|
||||
is_claimed = 0;
|
||||
parport_release(pport);
|
||||
parport_unregister_device(ppdevice);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
#endif
|
||||
if (debug)
|
||||
out(LIRC_PORT_DATA, 0);
|
||||
#endif
|
||||
|
||||
is_claimed = 0;
|
||||
parport_release(ppdevice);
|
||||
skip_init:
|
||||
driver.minor = lirc_register_driver(&driver);
|
||||
if (driver.minor < 0) {
|
||||
printk(KERN_NOTICE "%s: register_chrdev() failed\n",
|
||||
LIRC_DRIVER_NAME);
|
||||
parport_unregister_device(ppdevice);
|
||||
return -EIO;
|
||||
}
|
||||
printk(KERN_INFO "%s: installed using port 0x%04x irq %d\n",
|
||||
LIRC_DRIVER_NAME, io, irq);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit lirc_parallel_exit(void)
|
||||
{
|
||||
parport_unregister_device(ppdevice);
|
||||
lirc_unregister_driver(driver.minor);
|
||||
}
|
||||
|
||||
module_init(lirc_parallel_init);
|
||||
module_exit(lirc_parallel_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Infrared receiver driver for parallel ports.");
|
||||
MODULE_AUTHOR("Christoph Bartelmus");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
module_param(io, int, S_IRUGO);
|
||||
MODULE_PARM_DESC(io, "I/O address base (0x3bc, 0x378 or 0x278)");
|
||||
|
||||
module_param(irq, int, S_IRUGO);
|
||||
MODULE_PARM_DESC(irq, "Interrupt (7 or 5)");
|
||||
|
||||
module_param(tx_mask, int, S_IRUGO);
|
||||
MODULE_PARM_DESC(tx_maxk, "Transmitter mask (default: 0x01)");
|
||||
|
||||
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
||||
MODULE_PARM_DESC(debug, "Enable debugging messages");
|
||||
|
||||
module_param(check_pselecd, bool, S_IRUGO | S_IWUSR);
|
||||
MODULE_PARM_DESC(debug, "Check for printer (default: 0)");
|
||||
26
drivers/staging/lirc/lirc_parallel.h
Normal file
26
drivers/staging/lirc/lirc_parallel.h
Normal file
|
|
@ -0,0 +1,26 @@
|
|||
/* lirc_parallel.h */
|
||||
|
||||
#ifndef _LIRC_PARALLEL_H
|
||||
#define _LIRC_PARALLEL_H
|
||||
|
||||
#include <linux/lp.h>
|
||||
|
||||
#define LIRC_PORT_LEN 3
|
||||
|
||||
#define LIRC_LP_BASE 0
|
||||
#define LIRC_LP_STATUS 1
|
||||
#define LIRC_LP_CONTROL 2
|
||||
|
||||
#define LIRC_PORT_DATA LIRC_LP_BASE /* base */
|
||||
#define LIRC_PORT_TIMER LIRC_LP_STATUS /* status port */
|
||||
#define LIRC_PORT_TIMER_BIT LP_PBUSY /* busy signal */
|
||||
#define LIRC_PORT_SIGNAL LIRC_LP_STATUS /* status port */
|
||||
#define LIRC_PORT_SIGNAL_BIT LP_PACK /* ack signal */
|
||||
#define LIRC_PORT_IRQ LIRC_LP_CONTROL /* control port */
|
||||
|
||||
#define LIRC_SFH506_DELAY 0 /* delay t_phl in usecs */
|
||||
|
||||
#define LIRC_PARALLEL_MAX_TRANSMITTERS 8
|
||||
#define LIRC_PARALLEL_TRANSMITTER_MASK ((1<<LIRC_PARALLEL_MAX_TRANSMITTERS) - 1)
|
||||
|
||||
#endif
|
||||
Loading…
Reference in a new issue