ALSA: hda - Add a new function to seek for a codec ID

Gateway notebooks have their ID inside codec vendor ID, not at PCI ID. Due to
that, model auto-detection were not possible with the standard seek method.

This is what is found at lspci -vnn:

00:14.2 Audio device [0403]: ATI Technologies Inc SB450 HDA Audio [1002:437b] (rev 01)
        Subsystem: ATI Technologies Inc SB450 HDA Audio [1002:437b]

Yet, autodetection is possible, since the codec properly reflects the vendor at
the Subsystem ID:

$ cat /proc/asound/card0/codec#0 |head -4

Codec: SigmaTel STAC9250
Address: 0
Vendor Id: 0x83847634
Subsystem Id: 0x107b0367

This patch adds a new autodetection function that seeks for codec subsystem ID.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 64 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 004344825e9e..9c1af0101dde 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2705,6 +2705,67 @@ int snd_hda_check_board_config(struct hda_codec *codec,
 EXPORT_SYMBOL_HDA(snd_hda_check_board_config);
 
 /**
+ * snd_hda_check_board_codec_sid_config - compare the current codec
+                                          subsystem ID with the
+                                          config table
+
+           This is important for Gateway notebooks with SB450 HDA Audio
+           where the vendor ID of the PCI device is:
+                ATI Technologies Inc SB450 HDA Audio [1002:437b]
+           and the vendor/subvendor are found only at the codec.
+
+ * @codec: the HDA codec
+ * @num_configs: number of config enums
+ * @models: array of model name strings
+ * @tbl: configuration table, terminated by null entries
+ *
+ * Compares the modelname or PCI subsystem id of the current codec with the
+ * given configuration table.  If a matching entry is found, returns its
+ * config value (supposed to be 0 or positive).
+ *
+ * If no entries are matching, the function returns a negative value.
+ */
+int snd_hda_check_board_codec_sid_config(struct hda_codec *codec,
+                               int num_configs, const char **models,
+                               const struct snd_pci_quirk *tbl)
+{
+        const struct snd_pci_quirk *q;
+
+        /* Search for codec ID */
+        for (q = tbl; q->subvendor; q++) {
+                unsigned long vendorid = (q->subdevice) | (q->subvendor << 16);
+
+                if (vendorid == codec->subsystem_id)
+                        break;
+        }
+
+        if (!q->subvendor)
+                return -1;
+
+        tbl = q;
+
+        if (tbl->value >= 0 && tbl->value < num_configs) {
+#ifdef CONFIG_SND_DEBUG_DETECT
+                char tmp[10];
+                const char *model = NULL;
+                if (models)
+                        model = models[tbl->value];
+                if (!model) {
+                        sprintf(tmp, "#%d", tbl->value);
+                        model = tmp;
+                }
+                snd_printdd(KERN_INFO "hda_codec: model '%s' is selected "
+                            "for config %x:%x (%s)\n",
+                            model, tbl->subvendor, tbl->subdevice,
+                            (tbl->name ? tbl->name : "Unknown device"));
+#endif
+                return tbl->value;
+        }
+        return -1;
+}
+EXPORT_SYMBOL_HDA(snd_hda_check_board_codec_sid_config);
+
+/**
  * snd_hda_add_new_ctls - create controls from the array
  * @codec: the HDA codec
  * @knew: the array of struct snd_kcontrol_new
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index 6f2fe0f9fdd8..1dd8716c387f 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -296,6 +296,9 @@ void snd_print_pcm_bits(int pcm, char *buf, int buflen);
 int snd_hda_check_board_config(struct hda_codec *codec, int num_configs,
                                const char **modelnames,
                                const struct snd_pci_quirk *pci_list);
+int snd_hda_check_board_codec_sid_config(struct hda_codec *codec,
+                               int num_configs, const char **models,
+                               const struct snd_pci_quirk *tbl);
 int snd_hda_add_new_ctls(struct hda_codec *codec,
                          struct snd_kcontrol_new *knew);