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/* $Id: hw_alsa_usb.c,v 5.5 2010/04/11 18:50:38 lirc Exp $ */
/****************************************************************************
** hw_alsa_usb.c ***********************************************************
****************************************************************************
*
* routines for Sound Blaster USB audio devices accessed via ALSA hwdep
*
* Copyright (c) 2005 Clemens Ladisch <clemens@ladisch.de>
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <alsa/asoundlib.h>
#include "lircd.h"
#include "hardware.h"
static int init(void);
static int deinit(void);
static int decode(struct ir_remote *remote, ir_code * prep, ir_code * codep, ir_code * postp, int *repeat_flagp,
lirc_t * min_remaining_gapp, lirc_t * max_remaining_gapp);
static char *rec(struct ir_remote *remotes);
static ir_code code, last_code;
static snd_hwdep_t *hwdep;
static struct timeval last_time;
static int repeat_flag;
struct hardware hw_alsa_usb = {
"", /* default device */
-1, /* fd */
LIRC_CAN_REC_LIRCCODE, /* features */
0, /* send_mode */
LIRC_MODE_LIRCCODE, /* rec_mode */
8, /* code_length */
init, /* init_func */
deinit, /* deinit_func */
NULL, /* send_func */
rec, /* rec_func */
decode, /* decode_func */
NULL, /* ioctl_func */
NULL, /* readdata */
"alsa_usb"
};
static const char *search_device(void)
{
int card, err;
snd_hwdep_info_t *info;
snd_hwdep_info_alloca(&info);
card = -1;
while (snd_card_next(&card) >= 0 && card >= 0) {
char ctl_name[20];
snd_ctl_t *ctl;
int device;
sprintf(ctl_name, "hw:CARD=%d", card);
err = snd_ctl_open(&ctl, ctl_name, SND_CTL_NONBLOCK);
if (err < 0)
continue;
device = -1;
while (snd_ctl_hwdep_next_device(ctl, &device) >= 0 && device >= 0) {
snd_hwdep_info_set_device(info, device);
err = snd_ctl_hwdep_info(ctl, info);
if (err >= 0 && snd_hwdep_info_get_iface(info) == SND_HWDEP_IFACE_SB_RC) {
static char name[36];
sprintf(name, "hw:CARD=%d,DEV=%d", card, device);
snd_ctl_close(ctl);
return name;
}
}
snd_ctl_close(ctl);
}
return NULL;
}
static int init(void)
{
const char *device;
snd_hwdep_info_t *info;
struct pollfd pollfd;
int err;
device = hw.device;
if (!device || !*device) {
device = search_device();
if (!device) {
logprintf(LOG_ERR, "device not found");
return 0;
}
}
err = snd_hwdep_open(&hwdep, device, SND_HWDEP_OPEN_READ);
if (err < 0) {
logprintf(LOG_ERR, "cannot open %s: %s", device, snd_strerror(err));
return 0;
}
snd_hwdep_info_alloca(&info);
err = snd_hwdep_info(hwdep, info);
if (err < 0) {
snd_hwdep_close(hwdep);
logprintf(LOG_ERR, "cannot get hwdep info: %s", snd_strerror(err));
return 0;
}
if (snd_hwdep_info_get_iface(info) != SND_HWDEP_IFACE_SB_RC) {
snd_hwdep_close(hwdep);
logprintf(LOG_ERR, "%s is not a Sound Blaster remote control device", device);
return 0;
}
err = snd_hwdep_poll_descriptors(hwdep, &pollfd, 1);
if (err < 0) {
snd_hwdep_close(hwdep);
logprintf(LOG_ERR, "cannot get file descriptor: %s", snd_strerror(err));
return 0;
}
if (err != 1) {
snd_hwdep_close(hwdep);
logprintf(LOG_ERR, "invalid number of file descriptors (%d): %s", err, snd_strerror(err));
return 0;
}
hw.fd = pollfd.fd;
return 1;
}
static int deinit(void)
{
snd_hwdep_close(hwdep);
hw.fd = -1;
return 1;
}
static char *rec(struct ir_remote *remotes)
{
unsigned char rc_code;
ssize_t size;
struct timeval current;
size = snd_hwdep_read(hwdep, &rc_code, 1);
if (size < 1)
return NULL;
gettimeofday(¤t, NULL);
last_code = code;
code = (ir_code) rc_code;
/* delay for repeating buttons is up to 320 ms */
repeat_flag = code == last_code && current.tv_sec - last_time.tv_sec <= 2
&& time_elapsed(&last_time, ¤t) <= 350000;
last_time = current;
LOGPRINTF(1, "code: %llx", (__u64) code);
LOGPRINTF(1, "repeat_flag: %d", repeat_flag);
return decode_all(remotes);
}
static int decode(struct ir_remote *remote, ir_code * prep, ir_code * codep, ir_code * postp, int *repeat_flagp,
lirc_t * min_remaining_gapp, lirc_t * max_remaining_gapp)
{
if (!map_code(remote, prep, codep, postp, 0, 0, 8, code, 0, 0)) {
return (0);
}
*repeat_flagp = repeat_flag;
*min_remaining_gapp = 0;
*max_remaining_gapp = 0;
return 1;
}
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