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| author | Takashi Iwai <tiwai@suse.de> | 2015-03-10 00:19:47 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2015-03-23 15:19:43 +0300 |
| commit | 33f819400659da9ff9f636b78f33ff4f1f08cbd4 (patch) | |
| tree | bbb736ecbd1b38f750ddd6a921e323fb456a896e /sound/hda/hdac_regmap.c | |
| parent | d313e0a88d1b29d17198ef659af042a633a2d3de (diff) | |
| download | linux-33f819400659da9ff9f636b78f33ff4f1f08cbd4.tar.xz | |
ALSA: hda - Handle get/set power verb symmetrically via regmap
HD-audio has quite a few asymmetrical ways of accessing verbs, and one
of typical ones is GET/SET_POWER_STATE verbs. While it takes only the
power state for setting, it returns a combination of states for
getting. For making the state handling simpler, this patch adds a
code to translate the value returned from GET_POWER_STATE to return
only the actual state or -1 for error. In that way, the driver can
simplify the power state management.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/hda/hdac_regmap.c')
| -rw-r--r-- | sound/hda/hdac_regmap.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/sound/hda/hdac_regmap.c b/sound/hda/hdac_regmap.c index fb4a02e0319f..2eea8d4e6a7f 100644 --- a/sound/hda/hdac_regmap.c +++ b/sound/hda/hdac_regmap.c @@ -191,13 +191,24 @@ static int hda_reg_write_stereo_amp(struct hdac_device *codec, static int hda_reg_read(void *context, unsigned int reg, unsigned int *val) { struct hdac_device *codec = context; + int err; if (!codec_is_running(codec)) return -EAGAIN; reg |= (codec->addr << 28); if (is_stereo_amp_verb(reg)) return hda_reg_read_stereo_amp(codec, reg, val); - return snd_hdac_exec_verb(codec, reg, 0, val); + err = snd_hdac_exec_verb(codec, reg, 0, val); + if (err < 0) + return err; + /* special handling for asymmetric reads */ + if (get_verb(reg) == AC_VERB_GET_POWER_STATE) { + if (*val & AC_PWRST_ERROR) + *val = -1; + else /* take only the actual state */ + *val = (*val >> 4) & 0x0f; + } + return 0; } static int hda_reg_write(void *context, unsigned int reg, unsigned int val) |