From 1cdc6392b74246be333e2c88b61beedbf9991422 Mon Sep 17 00:00:00 2001 From: Devin Heitmueller Date: Tue, 9 Jun 2009 23:40:39 -0300 Subject: [PATCH] V4L/DVB (11979): em28xx: don't create audio device if not supported In cases where the device does not actually provide a USB audio class *or* vendor audio, do not load the driver that provides vendor audio support (such as the KWorld 2800d). Otherwise, the /dev/audio1 device file gets created and users get confused. Also, reworks the logic a bit so that we don't try to inspect the register content if the register read failed entirely. Signed-off-by: Devin Heitmueller Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/em28xx/em28xx-core.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c index b7a2fedc3904..c8d7ce8fbd36 100644 --- a/drivers/media/video/em28xx/em28xx-core.c +++ b/drivers/media/video/em28xx/em28xx-core.c @@ -500,18 +500,21 @@ int em28xx_audio_setup(struct em28xx *dev) /* See how this device is configured */ cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG); - if (cfg < 0) + em28xx_info("Config register raw data: 0x%02x\n", cfg); + if (cfg < 0) { + /* Register read error? */ cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */ - else - em28xx_info("Config register raw data: 0x%02x\n", cfg); - - if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == - EM28XX_CHIPCFG_I2S_3_SAMPRATES) { + } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) { + /* The device doesn't have vendor audio at all */ + dev->has_alsa_audio = 0; + dev->audio_mode.has_audio = 0; + return 0; + } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == + EM28XX_CHIPCFG_I2S_3_SAMPRATES) { em28xx_info("I2S Audio (3 sample rates)\n"); dev->audio_mode.i2s_3rates = 1; - } - if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == - EM28XX_CHIPCFG_I2S_5_SAMPRATES) { + } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == + EM28XX_CHIPCFG_I2S_5_SAMPRATES) { em28xx_info("I2S Audio (5 sample rates)\n"); dev->audio_mode.i2s_5rates = 1; } -- 2.20.1