C++ (Cpp) snd_hwdep_info示例

示例#1

文件： vxloader.c 项目： Distrotech/alsa-tools

/*
 * check the name id of the given hwdep handle
 */
static int check_hwinfo(snd_hwdep_t *hw, const char *id)
{
	snd_hwdep_info_t *info;
	int err;

	snd_hwdep_info_alloca(&info);
	if ((err = snd_hwdep_info(hw, info)) < 0)
		return err;
	if (strcmp(snd_hwdep_info_get_id(info), id))
		return -ENODEV;
	return 0; /* ok */
}

示例#2

文件： hwdep.c 项目： Nothing-Dev/android_kernel_lge_jagnm_lp

static int snd_hwdep_control_ioctl(struct snd_card *card,
				   struct snd_ctl_file * control,
				   unsigned int cmd, unsigned long arg)
{
	switch (cmd) {
	case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
		{
			int device;

			if (get_user(device, (int __user *)arg))
				return -EFAULT;
			mutex_lock(&register_mutex);

			if (device < 0)
				device = 0;
			else if (device < SNDRV_MINOR_HWDEPS)
				device++;
			else
				device = SNDRV_MINOR_HWDEPS;

			while (device < SNDRV_MINOR_HWDEPS) {
				if (snd_hwdep_search(card, device))
					break;
				device++;
			}
			if (device >= SNDRV_MINOR_HWDEPS)
				device = -1;
			mutex_unlock(&register_mutex);
			if (put_user(device, (int __user *)arg))
				return -EFAULT;
			return 0;
		}
	case SNDRV_CTL_IOCTL_HWDEP_INFO:
		{
			struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
			int device, err;
			struct snd_hwdep *hwdep;

			if (get_user(device, &info->device))
				return -EFAULT;
			mutex_lock(&register_mutex);
			hwdep = snd_hwdep_search(card, device);
			if (hwdep)
				err = snd_hwdep_info(hwdep, info);
			else
				err = -ENXIO;
			mutex_unlock(&register_mutex);
			return err;
		}
	}
	return -ENOIOCTLCMD;
}

示例#3

文件： alsa_usb.c 项目： andyvand/LIRC

static int init(void)
{
	const char* device;
	snd_hwdep_info_t* info;
	struct pollfd pollfd;
	int err;

	device = drv.device;
	if (!device || !*device) {
		device = search_device();
		if (!device) {
			logprintf(LIRC_ERROR, "device not found");
			return 0;
		}
	}
	err = snd_hwdep_open(&hwdep, device, SND_HWDEP_OPEN_READ);
	if (err < 0) {
		logprintf(LIRC_ERROR, "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(LIRC_ERROR, "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(LIRC_ERROR, "%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(LIRC_ERROR, "cannot get file descriptor: %s", snd_strerror(err));
		return 0;
	}
	if (err != 1) {
		snd_hwdep_close(hwdep);
		logprintf(LIRC_ERROR, "invalid number of file descriptors (%d): %s", err, snd_strerror(err));
		return 0;
	}
	drv.fd = pollfd.fd;
	return 1;
}

示例#4

文件： hwdep.c 项目： BackupTheBerlios/tew632-brp-svn

static long snd_hwdep_ioctl(struct file * file, unsigned int cmd, unsigned long arg)
{
	snd_hwdep_t *hw = file->private_data;
	void __user *argp = (void __user *)arg;
	switch (cmd) {
	case SNDRV_HWDEP_IOCTL_PVERSION:
		return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
	case SNDRV_HWDEP_IOCTL_INFO:
		return snd_hwdep_info(hw, argp);
	case SNDRV_HWDEP_IOCTL_DSP_STATUS:
		return snd_hwdep_dsp_status(hw, argp);
	case SNDRV_HWDEP_IOCTL_DSP_LOAD:
		return snd_hwdep_dsp_load(hw, argp);
	}
	if (hw->ops.ioctl)
		return hw->ops.ioctl(hw, file, cmd, arg);
	return -ENOTTY;
}

示例#5

文件： hwdep.c 项目： BackupTheBerlios/tew632-brp-svn

static int snd_hwdep_control_ioctl(snd_card_t * card, snd_ctl_file_t * control,
				   unsigned int cmd, unsigned long arg)
{
	unsigned int tmp;
	
	tmp = card->number * SNDRV_MINOR_HWDEPS;
	switch (cmd) {
	case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
		{
			int device;

			if (get_user(device, (int __user *)arg))
				return -EFAULT;
			device = device < 0 ? 0 : device + 1;
			while (device < SNDRV_MINOR_HWDEPS) {
				if (snd_hwdep_devices[tmp + device])
					break;
				device++;
			}
			if (device >= SNDRV_MINOR_HWDEPS)
				device = -1;
			if (put_user(device, (int __user *)arg))
				return -EFAULT;
			return 0;
		}
	case SNDRV_CTL_IOCTL_HWDEP_INFO:
		{
			snd_hwdep_info_t __user *info = (snd_hwdep_info_t __user *)arg;
			int device;
			snd_hwdep_t *hwdep;

			if (get_user(device, &info->device))
				return -EFAULT;
			if (device < 0 || device >= SNDRV_MINOR_HWDEPS)
				return -ENXIO;
			hwdep = snd_hwdep_devices[tmp + device];
			if (hwdep == NULL)
				return -ENXIO;
			return snd_hwdep_info(hwdep, info);
		}
	}
	return -ENOIOCTLCMD;
}