SNDRV_SEQ_OSS_FILE_READ
#define is_read_mode(mode) ((mode) & SNDRV_SEQ_OSS_FILE_READ)
snd_seq_oss_midi_open_all(dp, SNDRV_SEQ_OSS_FILE_READ);
file_mode |= SNDRV_SEQ_OSS_FILE_READ;
mode |= SNDRV_SEQ_OSS_FILE_READ;