[PATCH 10/11] hda - show EPSS capability in proc

[Wu Fengguang <fengguang.wu@intel.com>]

[-- Attachment #1: hda-power-epss.patch --]
[-- Type: text/plain, Size: 2366 bytes --]

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
 sound/pci/hda/hda_codec.h |    4 ++++
 sound/pci/hda/hda_proc.c  |   31 +++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

--- sound-2.6.orig/sound/pci/hda/hda_codec.h	2009-11-15 19:28:28.000000000 +0800
+++ sound-2.6/sound/pci/hda/hda_codec.h	2009-11-15 19:28:57.000000000 +0800
@@ -286,6 +286,10 @@ enum {
 #define AC_PWRST_D1SUP			(1<<1)
 #define AC_PWRST_D2SUP			(1<<2)
 #define AC_PWRST_D3SUP			(1<<3)
+#define AC_PWRST_D3COLDSUP		(1<<4)
+#define AC_PWRST_S3D3COLDSUP		(1<<29)
+#define AC_PWRST_CLKSTOP		(1<<30)
+#define AC_PWRST_EPSS			(1U<<31)
 
 /* Power state values */
 #define AC_PWRST_SETTING		(0xf<<0)
--- sound-2.6.orig/sound/pci/hda/hda_proc.c	2009-11-15 19:28:28.000000000 +0800
+++ sound-2.6/sound/pci/hda/hda_proc.c	2009-11-15 19:31:44.000000000 +0800
@@ -26,6 +26,21 @@
 #include "hda_codec.h"
 #include "hda_local.h"
 
+static char *bits_names(unsigned int bits, char *names[], int size)
+{
+       int i, n;
+       static char buf[128];
+
+       for (i = 0, n = 0; i < size; i++) {
+               if (bits & (1U<<i) && names[i])
+                       n += snprintf(buf + n, sizeof(buf) - n, " %s",
+                                                               names[i]);
+       }
+       buf[n] = '\0';
+
+       return buf;
+}
+
 static const char *get_wid_type_name(unsigned int wid_value)
 {
 	static char *names[16] = {
@@ -363,8 +378,24 @@ static const char *get_pwr_state(u32 sta
 static void print_power_state(struct snd_info_buffer *buffer,
 			      struct hda_codec *codec, hda_nid_t nid)
 {
+	static char *names[] = {
+		[ilog2(AC_PWRST_D0SUP)]		= "D0",
+		[ilog2(AC_PWRST_D1SUP)]		= "D1",
+		[ilog2(AC_PWRST_D2SUP)]		= "D2",
+		[ilog2(AC_PWRST_D3SUP)]		= "D3",
+		[ilog2(AC_PWRST_D3COLDSUP)]	= "D3cold",
+		[ilog2(AC_PWRST_S3D3COLDSUP)]	= "S3D3cold",
+		[ilog2(AC_PWRST_CLKSTOP)]	= "CLKSTOP",
+		[ilog2(AC_PWRST_EPSS)]		= "EPSS",
+	};
+
+	int sup = snd_hda_param_read(codec, nid, AC_PAR_POWER_STATE);
 	int pwr = snd_hda_codec_read(codec, nid, 0,
 				     AC_VERB_GET_POWER_STATE, 0);
+	if (sup)
+		snd_iprintf(buffer, "  Power states: %s\n",
+			    bits_names(sup, names, ARRAY_SIZE(names)));
+
 	snd_iprintf(buffer, "  Power: setting=%s, actual=%s\n",
 		    get_pwr_state(pwr & AC_PWRST_SETTING),
 		    get_pwr_state((pwr & AC_PWRST_ACTUAL) >>