ALSA: hda - Split the generic parser as an individual module

Drop the hard dependency on the generic parser code and load / unload
the generic parser code dynamically if built as a module.  This allows
us to avoid the generic parser if only HDMI/DP codecs are found.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

5 files changed, 58 insertions, 26 deletions

diff --git a/sound/pci/hda/Makefile b/sound/pci/hda/Makefile
index c091438286a3..5a40c652df41 100644
--- a/sound/pci/hda/Makefile
+++ b/sound/pci/hda/Makefile
@@ -3,7 +3,6 @@ snd-hda-intel-objs := hda_intel.o
 snd-hda-intel-$(CONFIG_SND_HDA_I915) += hda_i915.o
 
 snd-hda-codec-y := hda_codec.o hda_jack.o hda_auto_parser.o
-snd-hda-codec-$(CONFIG_SND_HDA_GENERIC) += hda_generic.o
 snd-hda-codec-$(CONFIG_PROC_FS) += hda_proc.o
 snd-hda-codec-$(CONFIG_SND_HDA_HWDEP) += hda_hwdep.o
 snd-hda-codec-$(CONFIG_SND_HDA_INPUT_BEEP) += hda_beep.o
@@ -12,6 +11,7 @@ snd-hda-codec-$(CONFIG_SND_HDA_INPUT_BEEP) += hda_beep.o
 CFLAGS_hda_codec.o := -I$(src)
 CFLAGS_hda_intel.o := -I$(src)
 
+snd-hda-codec-generic-objs :=   hda_generic.o
 snd-hda-codec-realtek-objs :=   patch_realtek.o
 snd-hda-codec-cmedia-objs :=    patch_cmedia.o
 snd-hda-codec-analog-objs :=    patch_analog.o
@@ -28,6 +28,9 @@ snd-hda-codec-hdmi-objs :=	patch_hdmi.o hda_eld.o
 obj-$(CONFIG_SND_HDA_INTEL) := snd-hda-codec.o
 
 # codec drivers (note: CONFIG_SND_HDA_CODEC_XXX are booleans)
+ifdef CONFIG_SND_HDA_GENERIC
+obj-$(CONFIG_SND_HDA_INTEL) += snd-hda-codec-generic.o
+endif
 ifdef CONFIG_SND_HDA_CODEC_REALTEK
 obj-$(CONFIG_SND_HDA_INTEL) += snd-hda-codec-realtek.o
 endif
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 69178c4f4113..4d3f46329eb5 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -945,9 +945,6 @@ find_codec_preset(struct hda_codec *codec)
         const struct hda_codec_preset *preset;
         unsigned int mod_requested = 0;
 
-        if (is_generic_config(codec))
-                return NULL; /* use the generic parser */
-
  again:
         mutex_lock(&preset_mutex);
         list_for_each_entry(tbl, &hda_preset_tables, list) {
@@ -1330,6 +1327,28 @@ get_hda_cvt_setup(struct hda_codec *codec, hda_nid_t nid)
 }
 
 /*
+ * Dynamic symbol binding for the codec parsers
+ */
+#ifdef MODULE
+#define load_parser_sym(sym)            ((int (*)(struct hda_codec *))symbol_request(sym))
+#define unload_parser_addr(addr)        symbol_put_addr(addr)
+#else
+#define load_parser_sym(sym)            (sym)
+#define unload_parser_addr(addr)        do {} while (0)
+#endif
+
+#define load_parser(codec, sym) \
+        ((codec)->parser = load_parser_sym(sym))
+
+static void unload_parser(struct hda_codec *codec)
+{
+        if (codec->parser) {
+                unload_parser_addr(codec->parser);
+                codec->parser = NULL;
+        }
+}
+
+/*
  * codec destructor
  */
 static void snd_hda_codec_free(struct hda_codec *codec)
@@ -1356,6 +1375,7 @@ static void snd_hda_codec_free(struct hda_codec *codec)
         if (!codec->pm_down_notified) /* cancel leftover refcounts */
                 hda_call_pm_notify(codec->bus, false);
 #endif
+        unload_parser(codec);
         module_put(codec->owner);
         free_hda_cache(&codec->amp_cache);
         free_hda_cache(&codec->cmd_cache);
@@ -1548,6 +1568,7 @@ EXPORT_SYMBOL_HDA(snd_hda_codec_update_widgets);
  */
 int snd_hda_codec_configure(struct hda_codec *codec)
 {
+        int (*patch)(struct hda_codec *) = NULL;
         int err;
 
         codec->preset = find_codec_preset(codec);
@@ -1557,29 +1578,38 @@ int snd_hda_codec_configure(struct hda_codec *codec)
                         return err;
         }
 
-        if (is_generic_config(codec)) {
-                err = snd_hda_parse_generic_codec(codec);
-                goto patched;
-        }
-        if (codec->preset && codec->preset->patch) {
-                err = codec->preset->patch(codec);
-                goto patched;
+        if (!is_generic_config(codec) && codec->preset)
+                patch = codec->preset->patch;
+        if (!patch) {
+                unload_parser(codec); /* to be sure */
+#ifdef CONFIG_SND_HDA_GENERIC
+                if (!patch)
+                        patch = load_parser(codec, snd_hda_parse_generic_codec);
+#endif
+                if (!patch) {
+                        printk(KERN_ERR "hda-codec: No codec parser is available\n");
+                        return -ENODEV;
+                }
         }
 
-        /* call the default parser */
-        err = snd_hda_parse_generic_codec(codec);
-        if (err < 0)
-                printk(KERN_ERR "hda-codec: No codec parser is available\n");
+        err = patch(codec);
+        if (err < 0) {
+                unload_parser(codec);
+                return err;
+        }
 
- patched:
-        if (!err && codec->patch_ops.unsol_event)
+        if (codec->patch_ops.unsol_event) {
                 err = init_unsol_queue(codec->bus);
+                if (err < 0)
+                        return err;
+        }
+
         /* audio codec should override the mixer name */
-        if (!err && (codec->afg || !*codec->bus->card->mixername))
+        if (codec->afg || !*codec->bus->card->mixername)
                 snprintf(codec->bus->card->mixername,
                          sizeof(codec->bus->card->mixername),
                          "%s %s", codec->vendor_name, codec->chip_name);
-        return err;
+        return 0;
 }
 EXPORT_SYMBOL_HDA(snd_hda_codec_configure);
 
@@ -2610,6 +2640,7 @@ int snd_hda_codec_reset(struct hda_codec *codec)
         codec->preset = NULL;
         codec->slave_dig_outs = NULL;
         codec->spdif_status_reset = 0;
+        unload_parser(codec);
         module_put(codec->owner);
         codec->owner = NULL;
 
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 7aa9870040c1..14e4b5a9c43c 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -834,6 +834,7 @@ struct hda_codec {
         /* detected preset */
         const struct hda_codec_preset *preset;
         struct module *owner;
+        int (*parser)(struct hda_codec *codec);
         const char *vendor_name;        /* codec vendor name */
         const char *chip_name;          /* codec chip name */
         const char *modelname;  /* model name for preset */
diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index 3067ed4fe3b2..9b251456f2a0 100644
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -28,6 +28,7 @@
 #include <linux/ctype.h>
 #include <linux/string.h>
 #include <linux/bitops.h>
+#include <linux/module.h>
 #include <sound/core.h>
 #include <sound/jack.h>
 #include "hda_codec.h"
@@ -5291,3 +5292,6 @@ error:
         return err;
 }
 EXPORT_SYMBOL_HDA(snd_hda_parse_generic_codec);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Generic HD-audio codec parser");
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index d398b648bb5d..4d571a6d9230 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -352,14 +352,7 @@ int snd_hda_multi_out_analog_cleanup(struct hda_codec *codec,
 /*
  * generic codec parser
  */
-#ifdef CONFIG_SND_HDA_GENERIC
 int snd_hda_parse_generic_codec(struct hda_codec *codec);
-#else
-static inline int snd_hda_parse_generic_codec(struct hda_codec *codec)
-{
-        return -ENODEV;
-}
-#endif
 
 /*
  * generic proc interface