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[ALSA] ac97 - Add support of static resolution tables

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Modules: AC97 Codec

Added the support of static resolution table support for codecs
that the driver cannot probe the volume resolution properly.

The table pointer should be set in each codec patch.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2006-02-09 11:45:20 +01:00 committed by Jaroslav Kysela
parent b2b8229dde
commit 50dabc2d11
2 changed files with 19 additions and 0 deletions
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7
include/sound/ac97_codec.h
View File

@ -444,6 +444,12 @@ struct snd_ac97_template {
DECLARE_BITMAP(reg_accessed, 0x80); /* bit flags */
};
/* static resolution table */
struct snd_ac97_res_table {
unsigned short reg; /* register */
unsigned short bits; /* resolution bitmask */
};
struct snd_ac97 {
/* -- lowlevel (hardware) driver specific -- */
struct snd_ac97_build_ops * build_ops;
@ -464,6 +470,7 @@ struct snd_ac97 {
unsigned short caps; /* capabilities (register 0) */
unsigned short ext_id; /* extended feature identification (register 28) */
unsigned short ext_mid; /* extended modem ID (register 3C) */
const struct snd_ac97_res_table *res_table; /* static resolution */
unsigned int scaps; /* driver capabilities */
unsigned int flags; /* specific code */
unsigned int rates[6]; /* see AC97_RATES_* defines */

12
sound/pci/ac97/ac97_codec.c
View File

@ -1030,6 +1030,18 @@ static void check_volume_resolution(struct snd_ac97 *ac97, int reg, unsigned cha
unsigned char max[3] = { 63, 31, 15 };
int i;
/* first look up the static resolution table */
if (ac97->res_table) {
const struct snd_ac97_res_table *tbl;
for (tbl = ac97->res_table; tbl->reg; tbl++) {
if (tbl->reg == reg) {
*lo_max = tbl->bits & 0xff;
*hi_max = (tbl->bits >> 8) & 0xff;
return;
}
}
}
*lo_max = *hi_max = 0;
for (i = 0 ; i < ARRAY_SIZE(cbit); i++) {
unsigned short val;