[alsa-devel] [PATCH 2/2] ASoC: arizona: Implement stability check for LHPF coefficients
Charles Keepax
ckeepax at opensource.wolfsonmicro.com
Thu Jun 25 10:35:12 CEST 2015
Specifying unstable coefficients for the low/high pass filters can have
a severe impact on the audio. This patchs adds a stability check on the
coefficients written to the low/high pass filter block to prevent this.
Signed-off-by: Charles Keepax <ckeepax at opensource.wolfsonmicro.com>
---
sound/soc/codecs/arizona.c | 17 +++++++++++++++++
sound/soc/codecs/arizona.h | 9 +++++++++
sound/soc/codecs/wm5102.c | 8 ++++----
sound/soc/codecs/wm5110.c | 8 ++++----
sound/soc/codecs/wm8997.c | 8 ++++----
5 files changed, 38 insertions(+), 12 deletions(-)
diff --git a/sound/soc/codecs/arizona.c b/sound/soc/codecs/arizona.c
index 3996786..a88202d 100644
--- a/sound/soc/codecs/arizona.c
+++ b/sound/soc/codecs/arizona.c
@@ -2372,6 +2372,23 @@ out:
}
EXPORT_SYMBOL_GPL(arizona_eq_coeff_put);
+int arizona_lhpf_coeff_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
+ struct arizona *arizona = dev_get_drvdata(codec->dev->parent);
+ __be16 *data = (__be16 *)ucontrol->value.bytes.data;
+ s16 val = be16_to_cpu(*data);
+
+ if (abs(val) >= 4096) {
+ dev_err(arizona->dev, "Rejecting unstable LHPF coefficients\n");
+ return -EINVAL;
+ }
+
+ return snd_soc_bytes_put(kcontrol, ucontrol);
+}
+EXPORT_SYMBOL_GPL(arizona_lhpf_coeff_put);
+
MODULE_DESCRIPTION("ASoC Wolfson Arizona class device support");
MODULE_AUTHOR("Mark Brown <broonie at opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");
diff --git a/sound/soc/codecs/arizona.h b/sound/soc/codecs/arizona.h
index ebe50cf..13598b0 100644
--- a/sound/soc/codecs/arizona.h
+++ b/sound/soc/codecs/arizona.h
@@ -201,6 +201,13 @@ extern int arizona_mixer_values[ARIZONA_NUM_MIXER_INPUTS];
((unsigned long)&(struct soc_bytes) { .base = xbase, \
.num_regs = 20, .mask = ~ARIZONA_EQ1_B1_MODE }) }
+#define ARIZONA_LHPF_CONTROL(xname, xbase) \
+{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
+ .info = snd_soc_bytes_info, .get = snd_soc_bytes_get, \
+ .put = arizona_lhpf_coeff_put, .private_value = \
+ ((unsigned long)&(struct soc_bytes) { .base = xbase, \
+ .num_regs = 1 }) }
+
#define ARIZONA_RATE_ENUM_SIZE 4
extern const char *arizona_rate_text[ARIZONA_RATE_ENUM_SIZE];
extern const int arizona_rate_val[ARIZONA_RATE_ENUM_SIZE];
@@ -238,6 +245,8 @@ extern int arizona_hp_ev(struct snd_soc_dapm_widget *w,
extern int arizona_eq_coeff_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol);
+extern int arizona_lhpf_coeff_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol);
extern int arizona_set_sysclk(struct snd_soc_codec *codec, int clk_id,
int source, unsigned int freq, int dir);
diff --git a/sound/soc/codecs/wm5102.c b/sound/soc/codecs/wm5102.c
index 556bd98..6ddee99 100644
--- a/sound/soc/codecs/wm5102.c
+++ b/sound/soc/codecs/wm5102.c
@@ -847,10 +847,10 @@ ARIZONA_MIXER_CONTROLS("LHPF2", ARIZONA_HPLP2MIX_INPUT_1_SOURCE),
ARIZONA_MIXER_CONTROLS("LHPF3", ARIZONA_HPLP3MIX_INPUT_1_SOURCE),
ARIZONA_MIXER_CONTROLS("LHPF4", ARIZONA_HPLP4MIX_INPUT_1_SOURCE),
-SND_SOC_BYTES("LHPF1 Coefficients", ARIZONA_HPLPF1_2, 1),
-SND_SOC_BYTES("LHPF2 Coefficients", ARIZONA_HPLPF2_2, 1),
-SND_SOC_BYTES("LHPF3 Coefficients", ARIZONA_HPLPF3_2, 1),
-SND_SOC_BYTES("LHPF4 Coefficients", ARIZONA_HPLPF4_2, 1),
+ARIZONA_LHPF_CONTROL("LHPF1 Coefficients", ARIZONA_HPLPF1_2),
+ARIZONA_LHPF_CONTROL("LHPF2 Coefficients", ARIZONA_HPLPF2_2),
+ARIZONA_LHPF_CONTROL("LHPF3 Coefficients", ARIZONA_HPLPF3_2),
+ARIZONA_LHPF_CONTROL("LHPF4 Coefficients", ARIZONA_HPLPF4_2),
ARIZONA_MIXER_CONTROLS("DSP1L", ARIZONA_DSP1LMIX_INPUT_1_SOURCE),
ARIZONA_MIXER_CONTROLS("DSP1R", ARIZONA_DSP1RMIX_INPUT_1_SOURCE),
diff --git a/sound/soc/codecs/wm5110.c b/sound/soc/codecs/wm5110.c
index dfa4d4b..05aa5bc 100644
--- a/sound/soc/codecs/wm5110.c
+++ b/sound/soc/codecs/wm5110.c
@@ -310,10 +310,10 @@ ARIZONA_MIXER_CONTROLS("LHPF2", ARIZONA_HPLP2MIX_INPUT_1_SOURCE),
ARIZONA_MIXER_CONTROLS("LHPF3", ARIZONA_HPLP3MIX_INPUT_1_SOURCE),
ARIZONA_MIXER_CONTROLS("LHPF4", ARIZONA_HPLP4MIX_INPUT_1_SOURCE),
-SND_SOC_BYTES("LHPF1 Coefficients", ARIZONA_HPLPF1_2, 1),
-SND_SOC_BYTES("LHPF2 Coefficients", ARIZONA_HPLPF2_2, 1),
-SND_SOC_BYTES("LHPF3 Coefficients", ARIZONA_HPLPF3_2, 1),
-SND_SOC_BYTES("LHPF4 Coefficients", ARIZONA_HPLPF4_2, 1),
+ARIZONA_LHPF_CONTROL("LHPF1 Coefficients", ARIZONA_HPLPF1_2),
+ARIZONA_LHPF_CONTROL("LHPF2 Coefficients", ARIZONA_HPLPF2_2),
+ARIZONA_LHPF_CONTROL("LHPF3 Coefficients", ARIZONA_HPLPF3_2),
+ARIZONA_LHPF_CONTROL("LHPF4 Coefficients", ARIZONA_HPLPF4_2),
SOC_ENUM("LHPF1 Mode", arizona_lhpf1_mode),
SOC_ENUM("LHPF2 Mode", arizona_lhpf2_mode),
diff --git a/sound/soc/codecs/wm8997.c b/sound/soc/codecs/wm8997.c
index 53e0a46..b4dba3a 100644
--- a/sound/soc/codecs/wm8997.c
+++ b/sound/soc/codecs/wm8997.c
@@ -238,10 +238,10 @@ SOC_ENUM("LHPF2 Mode", arizona_lhpf2_mode),
SOC_ENUM("LHPF3 Mode", arizona_lhpf3_mode),
SOC_ENUM("LHPF4 Mode", arizona_lhpf4_mode),
-SND_SOC_BYTES("LHPF1 Coefficients", ARIZONA_HPLPF1_2, 1),
-SND_SOC_BYTES("LHPF2 Coefficients", ARIZONA_HPLPF2_2, 1),
-SND_SOC_BYTES("LHPF3 Coefficients", ARIZONA_HPLPF3_2, 1),
-SND_SOC_BYTES("LHPF4 Coefficients", ARIZONA_HPLPF4_2, 1),
+ARIZONA_LHPF_CONTROL("LHPF1 Coefficients", ARIZONA_HPLPF1_2),
+ARIZONA_LHPF_CONTROL("LHPF2 Coefficients", ARIZONA_HPLPF2_2),
+ARIZONA_LHPF_CONTROL("LHPF3 Coefficients", ARIZONA_HPLPF3_2),
+ARIZONA_LHPF_CONTROL("LHPF4 Coefficients", ARIZONA_HPLPF4_2),
SOC_ENUM("ISRC1 FSL", arizona_isrc_fsl[0]),
SOC_ENUM("ISRC2 FSL", arizona_isrc_fsl[1]),
--
1.7.2.5
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