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>

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;
+}