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authorTakashi Iwai <tiwai@suse.de>2007-07-27 20:58:06 +0400
committerJaroslav Kysela <perex@perex.cz>2007-10-16 17:58:10 +0400
commit2807314d467e7dd929c42050031aabbd28e78f0b (patch)
treed4d05f61ef8cc1115ae73af900b8012392321caa /sound/pci/hda/hda_hwdep.c
parentef5fa1a49fc3b5fe8e734f25fa61bc73ccba344e (diff)
downloadlinux-2807314d467e7dd929c42050031aabbd28e78f0b.tar.xz
[ALSA] hda-intel - Add hwdep interface
Added a hwdep interface for each codec (enabled per kconfig). This interface can be used for reading/writing HD-audio verbs and other purposes as future extensions. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound/pci/hda/hda_hwdep.c')
-rw-r--r--sound/pci/hda/hda_hwdep.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_hwdep.c b/sound/pci/hda/hda_hwdep.c
new file mode 100644
index 000000000000..64be7b533488
--- /dev/null
+++ b/sound/pci/hda/hda_hwdep.c
@@ -0,0 +1,122 @@
+/*
+ * HWDEP Interface for HD-audio codec
+ *
+ * Copyright (c) 2007 Takashi Iwai <tiwai@suse.de>
+ *
+ * This driver is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This driver is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <sound/driver.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/compat.h>
+#include <linux/mutex.h>
+#include <sound/core.h>
+#include "hda_codec.h"
+#include "hda_local.h"
+#include <sound/hda_hwdep.h>
+
+/*
+ * write/read an out-of-bound verb
+ */
+static int verb_write_ioctl(struct hda_codec *codec,
+ struct hda_verb_ioctl __user *arg)
+{
+ u32 verb, res;
+
+ if (get_user(verb, &arg->verb))
+ return -EFAULT;
+ res = snd_hda_codec_read(codec, verb >> 24, 0,
+ (verb >> 8) & 0xffff, verb & 0xff);
+ if (put_user(res, &arg->res))
+ return -EFAULT;
+ return 0;
+}
+
+static int get_wcap_ioctl(struct hda_codec *codec,
+ struct hda_verb_ioctl __user *arg)
+{
+ u32 verb, res;
+
+ if (get_user(verb, &arg->verb))
+ return -EFAULT;
+ res = get_wcaps(codec, verb >> 24);
+ if (put_user(res, &arg->res))
+ return -EFAULT;
+ return 0;
+}
+
+
+/*
+ */
+static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct hda_codec *codec = hw->private_data;
+ void __user *argp = (void __user *)arg;
+
+ switch (cmd) {
+ case HDA_IOCTL_PVERSION:
+ return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
+ case HDA_IOCTL_VERB_WRITE:
+ return verb_write_ioctl(codec, argp);
+ case HDA_IOCTL_GET_WCAP:
+ return get_wcap_ioctl(codec, argp);
+ }
+ return -ENOIOCTLCMD;
+}
+
+#ifdef CONFIG_COMPAT
+static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ return hda_hwdep_ioctl(hw, file, cmd, compat_ptr(arg));
+}
+#endif
+
+static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
+{
+#ifndef CONFIG_SND_DEBUG_DETECT
+ if (!capable(CAP_SYS_RAWIO))
+ return -EACCES;
+#endif
+ return 0;
+}
+
+int __devinit snd_hda_create_hwdep(struct hda_codec *codec)
+{
+ char hwname[16];
+ struct snd_hwdep *hwdep;
+ int err;
+
+ sprintf(hwname, "HDA Codec %d", codec->addr);
+ err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
+ if (err < 0)
+ return err;
+ codec->hwdep = hwdep;
+ sprintf(hwdep->name, "HDA Codec %d", codec->addr);
+ hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
+ hwdep->private_data = codec;
+ hwdep->exclusive = 1;
+
+ hwdep->ops.open = hda_hwdep_open;
+ hwdep->ops.ioctl = hda_hwdep_ioctl;
+#ifdef CONFIG_COMPAT
+ hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
+#endif
+
+ return 0;
+}