ALSA: hda - Add parameter for dumping processing coefficients

[pandora-kernel.git] / sound / pci / hda / hda_proc.c

diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index a8cb22e..ce5a6da 100644 (file)
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -24,9 +24,14 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <sound/core.h>
+#include <linux/module.h>
 #include "hda_codec.h"
 #include "hda_local.h"
 
+static int dump_coef = -1;
+module_param(dump_coef, int, 0644);
+MODULE_PARM_DESC(dump_coef, "Dump processing coefficients in codec proc file (-1=auto, 0=disable, 1=enable)");
+
 static char *bits_names(unsigned int bits, char *names[], int size)
 {
        int i, n;
@@ -488,14 +493,39 @@ static void print_unsol_cap(struct snd_info_buffer *buffer,
                    (unsol & AC_UNSOL_ENABLED) ? 1 : 0);
 }
 
+static inline bool can_dump_coef(struct hda_codec *codec)
+{
+       switch (dump_coef) {
+       case 0: return false;
+       case 1: return true;
+       default: return codec->dump_coef;
+       }
+}
+
 static void print_proc_caps(struct snd_info_buffer *buffer,
                            struct hda_codec *codec, hda_nid_t nid)
 {
+       unsigned int i, ncoeff, oldindex;
        unsigned int proc_caps = snd_hda_param_read(codec, nid,
                                                    AC_PAR_PROC_CAP);
+       ncoeff = (proc_caps & AC_PCAP_NUM_COEF) >> AC_PCAP_NUM_COEF_SHIFT;
        snd_iprintf(buffer, "  Processing caps: benign=%d, ncoeff=%d\n",
-                   proc_caps & AC_PCAP_BENIGN,
-                   (proc_caps & AC_PCAP_NUM_COEF) >> AC_PCAP_NUM_COEF_SHIFT);
+                   proc_caps & AC_PCAP_BENIGN, ncoeff);
+
+       if (!can_dump_coef(codec))
+               return;
+
+       /* Note: This is racy - another process could run in parallel and change
+          the coef index too. */
+       oldindex = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_COEF_INDEX, 0);
+       for (i = 0; i < ncoeff; i++) {
+               unsigned int val;
+               snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_COEF_INDEX, i);
+               val = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_PROC_COEF,
+                                        0);
+               snd_iprintf(buffer, "    Coeff 0x%02x: 0x%04x\n", i, val);
+       }
+       snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_COEF_INDEX, oldindex);
 }
 
 static void print_conn_list(struct snd_info_buffer *buffer,