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authorTakashi Iwai <tiwai@suse.de>2008-07-30 17:01:46 +0400
committerTakashi Iwai <tiwai@suse.de>2008-10-13 04:43:02 +0400
commitd7ffba19ce4c1b153d502a89d829400bf76d6c11 (patch)
treefca202a4d4cd4dae9ded85c274746693b22a5fb4 /sound/pci/hda/hda_hwdep.c
parent6c1f45ea89b59ad2cdbfa6779e23d77b274da0a7 (diff)
downloadlinux-d7ffba19ce4c1b153d502a89d829400bf76d6c11.tar.xz
ALSA: hda - Add sysfs entries to hwdep devices
Added the sysfs entries to hwdep devices so that the new features like reconfiguration can be done via sysfs. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/hda/hda_hwdep.c')
-rw-r--r--sound/pci/hda/hda_hwdep.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_hwdep.c b/sound/pci/hda/hda_hwdep.c
index 6e18a422d993..214772c8b556 100644
--- a/sound/pci/hda/hda_hwdep.c
+++ b/sound/pci/hda/hda_hwdep.c
@@ -27,6 +27,7 @@
#include "hda_codec.h"
#include "hda_local.h"
#include <sound/hda_hwdep.h>
+#include <sound/minors.h>
/*
* write/read an out-of-bound verb
@@ -119,3 +120,159 @@ int __devinit snd_hda_create_hwdep(struct hda_codec *codec)
return 0;
}
+
+/*
+ * sysfs interface
+ */
+
+static int clear_codec(struct hda_codec *codec)
+{
+ snd_hda_codec_reset(codec);
+ return 0;
+}
+
+static int reconfig_codec(struct hda_codec *codec)
+{
+ int err;
+
+ snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
+ snd_hda_codec_reset(codec);
+ err = snd_hda_codec_configure(codec);
+ if (err < 0)
+ return err;
+ /* rebuild PCMs */
+ err = snd_hda_build_pcms(codec->bus);
+ if (err < 0)
+ return err;
+ /* rebuild mixers */
+ err = snd_hda_codec_build_controls(codec);
+ if (err < 0)
+ return err;
+ return 0;
+}
+
+/*
+ * allocate a string at most len chars, and remove the trailing EOL
+ */
+static char *kstrndup_noeol(const char *src, size_t len)
+{
+ char *s = kstrndup(src, len, GFP_KERNEL);
+ char *p;
+ if (!s)
+ return NULL;
+ p = strchr(s, '\n');
+ if (p)
+ *p = 0;
+ return s;
+}
+
+#define CODEC_INFO_SHOW(type) \
+static ssize_t type##_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
+ struct hda_codec *codec = hwdep->private_data; \
+ return sprintf(buf, "0x%x\n", codec->type); \
+}
+
+#define CODEC_INFO_STR_SHOW(type) \
+static ssize_t type##_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
+ struct hda_codec *codec = hwdep->private_data; \
+ return sprintf(buf, "%s\n", \
+ codec->type ? codec->type : ""); \
+}
+
+CODEC_INFO_SHOW(vendor_id);
+CODEC_INFO_SHOW(subsystem_id);
+CODEC_INFO_SHOW(revision_id);
+CODEC_INFO_SHOW(afg);
+CODEC_INFO_SHOW(mfg);
+CODEC_INFO_STR_SHOW(name);
+CODEC_INFO_STR_SHOW(modelname);
+
+#define CODEC_INFO_STORE(type) \
+static ssize_t type##_store(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
+ struct hda_codec *codec = hwdep->private_data; \
+ char *after; \
+ codec->type = simple_strtoul(buf, &after, 0); \
+ return count; \
+}
+
+#define CODEC_INFO_STR_STORE(type) \
+static ssize_t type##_store(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
+ struct hda_codec *codec = hwdep->private_data; \
+ char *s = kstrndup_noeol(buf, 64); \
+ if (!s) \
+ return -ENOMEM; \
+ kfree(codec->type); \
+ codec->type = s; \
+ return count; \
+}
+
+CODEC_INFO_STORE(vendor_id);
+CODEC_INFO_STORE(subsystem_id);
+CODEC_INFO_STORE(revision_id);
+CODEC_INFO_STR_STORE(name);
+CODEC_INFO_STR_STORE(modelname);
+
+#define CODEC_ACTION_STORE(type) \
+static ssize_t type##_store(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ struct snd_hwdep *hwdep = dev_get_drvdata(dev); \
+ struct hda_codec *codec = hwdep->private_data; \
+ int err = 0; \
+ if (*buf) \
+ err = type##_codec(codec); \
+ return err < 0 ? err : count; \
+}
+
+CODEC_ACTION_STORE(reconfig);
+CODEC_ACTION_STORE(clear);
+
+#define CODEC_ATTR_RW(type) \
+ __ATTR(type, 0644, type##_show, type##_store)
+#define CODEC_ATTR_RO(type) \
+ __ATTR_RO(type)
+#define CODEC_ATTR_WO(type) \
+ __ATTR(type, 0200, NULL, type##_store)
+
+static struct device_attribute codec_attrs[] = {
+ CODEC_ATTR_RW(vendor_id),
+ CODEC_ATTR_RW(subsystem_id),
+ CODEC_ATTR_RW(revision_id),
+ CODEC_ATTR_RO(afg),
+ CODEC_ATTR_RO(mfg),
+ CODEC_ATTR_RW(name),
+ CODEC_ATTR_RW(modelname),
+ CODEC_ATTR_WO(reconfig),
+ CODEC_ATTR_WO(clear),
+};
+
+/*
+ * create sysfs files on hwdep directory
+ */
+int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
+{
+ struct snd_hwdep *hwdep = codec->hwdep;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
+ snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
+ hwdep->device, &codec_attrs[i]);
+ return 0;
+}