February 2016 - Alsa-devel - mailman.alsa-project.org

[alsa-devel] [PATCH 0/15 v2][RFC] cleanup regmap write functions
by Kuninori Morimoto 26 Feb '16

26 Feb '16

Hi Mark Current regmap has many similar functions regmap_update_bits() regmap_update_bits_async() regmap_update_bits_check() regmap_update_bits_check_async() But difference is very few. And I would like to have _force_ feature on it too. So, these patches add new regmap_update_bits_base() which has _check, _async, and _force option. Above functions are now defined as macro. I used [RFC], because regmap has big effects. 1), 6), 9) adds new regmap_xxx_update_bits_base() functions and current each functions are merged into it by macro. Please review carefully especially 7), 10). I think using ~0 mask is correct for regmap_field_write() <-> regmap_field_update_bits_base() 1) - 5) for regmap_xxx() 6) - 8) for regmap_field_xxx() 9) - 11) for regmap_fields_xxx() 12) - 13) adds _force_ macro 14) remove unused regmap_write_bits() which was one of _force_ function 15) rsnd driver uses _force_ function for register access BTW, I noticed #if - #else - #endif on ${LINUX}/include/linux/regmap.h are strange. Many functions/struct/macro are defined under #ifdef CONFIG_REGMAP, but few are defined under #else. It can be trouble ? Do we really need this #if ? Kuninori Morimoto (15): 1) regmap: add regmap_update_bits_base() 2) regmap: merge regmap_update_bits() into macro 3) regmap: merge regmap_update_bits_async() into macro 4) regmap: merge regmap_update_bits_check() into macro 5) regmap: merge regmap_update_bits_check_async() into macro 6) regmap: add regmap_field_update_bits_base() 7) regmap: merge regmap_field_write() into macro 8) regmap: merge regmap_field_update_bits() into macro 9) regmap: add regmap_fields_update_bits_base() 10) regmap: merge regmap_fields_write() into macro 11) regmap: merge regmap_fields_update_bits() into macro 12) regmap: add regmap_field_force_xxx() macros 13) regmap: add regmap_fields_force_xxx() macros 14) regmpa: remove regmap_write_bits() 15) ASoC: rsnd: rsnd_write() / rsnd_bset() uses regmap _force_ function drivers/base/regmap/regmap.c | 217 ++++++++++++++++++++++++----------------------------------------------------------------------------------------------------------- include/linux/regmap.h | 94 ++++++++++++++++++++++++++++----------------------------- sound/soc/sh/rcar/gen.c | 21 ++----------- sound/soc/sh/rcar/rsnd.h | 2 -- 4 files changed, 87 insertions(+), 247 deletions(-) Best regards --- Kuninori Morimoto

2 29

[alsa-devel] [PATCH 0/6][RFC] cleanup regmap write functions
by Kuninori Morimoto 26 Feb '16

26 Feb '16

Hi Mark Current regmap has many similar functions regmap_update_bits() regmap_update_bits_async() regmap_update_bits_check() regmap_update_bits_check_async() But difference is very few. And I would like to have _force_ feature on it. So, these patches add new regmap_raw_update_bits() which has _check, _async, _force option. Above functions are now defined as macro. 4), 5) adds _force_ feature. We can easily add _check, _async. I used [RFC], because regmap has many effect. BTW, I noticed #if - #else - #endif on ${LINUX}/include/linux/regmap.h are strange. Many functions/struct/macro are defined under #ifdef CONFIG_REGMAP, but few are defined under #else. It can be trouble ? Do we really need this #if ? Kuninori Morimoto (7): 1) regmap: add regmap_raw_update_bits() and merge all regmap_update_bits_xxx() 2) regmap: regmap_field_xxx() uses regmap_raw_update_bits() 3) regmap: regmap_fields_xxx() uses regmap_raw_update_bits() 4) regmap: add regmap_field_force_xxx() functions 5) regmap: add regmap_fields_force_xxx() functions 6) regmpa: remove regmap_write_bits() 7) ASoC: rsnd: rsnd_write() / rsnd_bset() uses regmap _force_ function drivers/base/regmap/regmap.c | 191 +++++++++++++++++++++++++++++------------------------------------------------------------------------------------------------------ include/linux/regmap.h | 102 ++++++++++++++++++++++++++++++---------------------------------------- sound/soc/sh/rcar/gen.c | 21 ++------------- sound/soc/sh/rcar/rsnd.h | 2 -- 4 files changed, 88 insertions(+), 228 deletions(-) Best regards --- Kuninori Morimoto

2 10

[alsa-devel] [PATCH] ASoC: mediatek: Add I03/I04 widgets and corresponding routes
by PC Liao 26 Feb '16

26 Feb '16

From: Koro Chen <koro.chen(a)mediatek.com> Add these widgets to allow another path from I2S input. Change-Id: Ib6804bbbde388830d8359245fe13bbb0f2bb36ba Signed-off-by: Koro Chen <koro.chen(a)mediatek.com> Signed-off-by: PC Liao <pc.liao(a)mediatek.com> --- sound/soc/mediatek/mtk-afe-pcm.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/sound/soc/mediatek/mtk-afe-pcm.c b/sound/soc/mediatek/mtk-afe-pcm.c index 689c51f..5de878f 100644 --- a/sound/soc/mediatek/mtk-afe-pcm.c +++ b/sound/soc/mediatek/mtk-afe-pcm.c @@ -40,6 +40,7 @@ #define AFE_CONN1 0x0024 #define AFE_CONN2 0x0028 +#define AFE_CONN3 0x002c #define AFE_CONN7 0x0460 #define AFE_CONN8 0x0464 #define AFE_HDMI_CONN0 0x0390 @@ -63,6 +64,7 @@ #define AFE_HDMI_OUT_CUR 0x0378 #define AFE_HDMI_OUT_END 0x037c +#define AFE_ADDA_TOP_CON0 0x0120 #define AFE_ADDA2_TOP_CON0 0x0600 #define AFE_HDMI_OUT_CON0 0x0370 @@ -259,6 +261,7 @@ static int mtk_afe_set_i2s(struct mtk_afe *afe, unsigned int rate) return -EINVAL; /* from external ADC */ + regmap_update_bits(afe->regmap, AFE_ADDA_TOP_CON0, 0x1, 0x1); regmap_update_bits(afe->regmap, AFE_ADDA2_TOP_CON0, 0x1, 0x1); /* set input */ @@ -903,15 +906,19 @@ static const struct snd_kcontrol_new mtk_afe_o04_mix[] = { }; static const struct snd_kcontrol_new mtk_afe_o09_mix[] = { + SOC_DAPM_SINGLE_AUTODISABLE("I03 Switch", AFE_CONN3, 0, 1, 0), SOC_DAPM_SINGLE_AUTODISABLE("I17 Switch", AFE_CONN7, 30, 1, 0), }; static const struct snd_kcontrol_new mtk_afe_o10_mix[] = { + SOC_DAPM_SINGLE_AUTODISABLE("I04 Switch", AFE_CONN3, 3, 1, 0), SOC_DAPM_SINGLE_AUTODISABLE("I18 Switch", AFE_CONN8, 0, 1, 0), }; static const struct snd_soc_dapm_widget mtk_afe_pcm_widgets[] = { /* inter-connections */ + SND_SOC_DAPM_MIXER("I03", SND_SOC_NOPM, 0, 0, NULL, 0), + SND_SOC_DAPM_MIXER("I04", SND_SOC_NOPM, 0, 0, NULL, 0), SND_SOC_DAPM_MIXER("I05", SND_SOC_NOPM, 0, 0, NULL, 0), SND_SOC_DAPM_MIXER("I06", SND_SOC_NOPM, 0, 0, NULL, 0), SND_SOC_DAPM_MIXER("I17", SND_SOC_NOPM, 0, 0, NULL, 0), @@ -934,12 +941,16 @@ static const struct snd_soc_dapm_route mtk_afe_pcm_routes[] = { {"I2S Playback", NULL, "O04"}, {"VUL", NULL, "O09"}, {"VUL", NULL, "O10"}, + {"I03", NULL, "I2S Capture"}, + {"I04", NULL, "I2S Capture"}, {"I17", NULL, "I2S Capture"}, {"I18", NULL, "I2S Capture"}, { "O03", "I05 Switch", "I05" }, { "O04", "I06 Switch", "I06" }, { "O09", "I17 Switch", "I17" }, + { "O09", "I03 Switch", "I03" }, { "O10", "I18 Switch", "I18" }, + { "O10", "I04 Switch", "I04" }, }; static const struct snd_soc_dapm_route mtk_afe_hdmi_routes[] = { -- 1.7.9.5

2 4

[alsa-devel] [patch 2/2] ASoC: max9867: silence and array overflow warning
by Dan Carpenter 26 Feb '16

26 Feb '16

Smatch complains that we might reach the end of this loop without finding what we're looking for leading to a buffer overflow. Signed-off-by: Dan Carpenter <dan.carpenter(a)oracle.com> diff --git a/sound/soc/codecs/max9867.c b/sound/soc/codecs/max9867.c index 4fb6fc7..9fb03c6 100755 --- a/sound/soc/codecs/max9867.c +++ b/sound/soc/codecs/max9867.c @@ -156,6 +156,8 @@ static inline int get_ni_value(int mclk, int rate) if (ni_div[i].mclk >= mclk) break; } + if (i == ARRAY_SIZE(ni_div)) + return -EINVAL; switch (rate) { case 8000:

3 2

[alsa-devel] [PATCH] sound: hdmi: avoid dereferencing uninitialized 'jack' pointer
by Arnd Bergmann 26 Feb '16

26 Feb '16

When CONFIG_SND_JACK is disabled, the hdmi driver tries to create a new output jack structure and dereferences it even though the pointer is never assigned: sound/pci/hda/patch_hdmi.c: In function 'generic_hdmi_build_jack': sound/pci/hda/patch_hdmi.c:2534:30: error: 'jack' may be used uninitialized in this function [-Werror=maybe-uninitialized] sound/pci/hda/patch_hdmi.c:2526:19: note: 'jack' was declared here This uses a compile-time check to avoid calling a nonworking snd_jack_new() function, and sets an explicit NULL pointer instead. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> Fixes: 788d441a164c ("ALSA: hda - Use component ops for i915 HDMI/DP audio jack handling") --- sound/pci/hda/patch_hdmi.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index f4443b5fbf6e..c0872ad80aa0 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -2526,6 +2526,11 @@ static int add_hdmi_jack_kctl(struct hda_codec *codec, struct snd_jack *jack; int err; + if (!IS_ENABLED(CONFIG_SND_JACK)) { + spec->pcm_rec[pcm_idx].jack = NULL; + return 0; + } + err = snd_jack_new(codec->card, name, SND_JACK_AVOUT, &jack, true, false); if (err < 0) -- 2.7.0

3 17

[alsa-devel] [PATCH 1/2] ASoC: rt5645: improve headphone pop when system resumes from S3
by John Lin 26 Feb '16

26 Feb '16

When playing audio through headphone, headphone makes pop noise if system resumes from S3 to S0. We modify the sequence of writing register for avoiding pop sound. Signed-off-by: John Lin <john.lin(a)realtek.com> --- sound/soc/codecs/rt5645.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/sound/soc/codecs/rt5645.c b/sound/soc/codecs/rt5645.c index 93e8c90..d57119d 100644 --- a/sound/soc/codecs/rt5645.c +++ b/sound/soc/codecs/rt5645.c @@ -3029,13 +3029,18 @@ static int rt5645_set_bias_level(struct snd_soc_codec *codec, RT5645_PWR_BG | RT5645_PWR_VREF2, RT5645_PWR_VREF1 | RT5645_PWR_MB | RT5645_PWR_BG | RT5645_PWR_VREF2); + mdelay(10); snd_soc_update_bits(codec, RT5645_PWR_ANLG1, RT5645_PWR_FV1 | RT5645_PWR_FV2, RT5645_PWR_FV1 | RT5645_PWR_FV2); - if (rt5645->en_button_func && - snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) - queue_delayed_work(system_power_efficient_wq, - &rt5645->jack_detect_work, msecs_to_jiffies(0)); + if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) { + snd_soc_write(codec, RT5645_DEPOP_M2, 0x1140); + msleep(40); + if (rt5645->en_button_func) + queue_delayed_work(system_power_efficient_wq, + &rt5645->jack_detect_work, + msecs_to_jiffies(0)); + } break; case SND_SOC_BIAS_OFF: -- 1.8.1.1.439.g50a6b54

2 3

[alsa-devel] [PATCH] ASoC: pxa: remove incorrect do_div() call
by Arnd Bergmann 26 Feb '16

26 Feb '16

The new optimized do_div implementation (now in asm-generic/next) exposes a glitch in the brownstone audio driver by producing a compile-time warning: sound/soc/pxa/brownstone.c: In function 'brownstone_wm8994_hw_params': sound/soc/pxa/brownstone.c:67:85: warning: comparison of distinct pointer types lacks a cast sound/soc/pxa/brownstone.c:67:10125: warning: right shift count >= width of type [-Wshift-count-overflow] sound/soc/pxa/brownstone.c:67:10254: warning: passing argument 1 of '__div64_32' from incompatible pointer type [-Wincompatible-pointer-types] The driver just divides two plain integer values, so it should not use do_div to start with, but has apparently done so ever since the code was first merged. This replaces do_div with a simple division operator. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- I think this one is harmless, so we only need it in 4.5 to avoid the warning, but not backported to earlier kernels. Found today on ARM allmodconfig diff --git a/sound/soc/pxa/brownstone.c b/sound/soc/pxa/brownstone.c index 6147e86e9b0f..416ea646c3b1 100644 --- a/sound/soc/pxa/brownstone.c +++ b/sound/soc/pxa/brownstone.c @@ -63,8 +63,7 @@ static int brownstone_wm8994_hw_params(struct snd_pcm_substream *substream, sysclk = params_rate(params) * 512; sspa_mclk = params_rate(params) * 64; } - sspa_div = freq_out; - do_div(sspa_div, sspa_mclk); + sspa_div = freq_out / sspa_mclk; snd_soc_dai_set_sysclk(cpu_dai, MMP_SSPA_CLK_AUDIO, freq_out, 0); snd_soc_dai_set_pll(cpu_dai, MMP_SYSCLK, 0, freq_out, sysclk);

3 4

[alsa-devel] [PATCH] ASoC: mediatek: remove soft reset and add second I2S clock
by PC Liao 26 Feb '16

26 Feb '16

To improve I2S flow, this patch removes soft reset and adds second I2S clock to use. Signed-off-by: PC Liao <pc.liao(a)mediatek.com> --- sound/soc/mediatek/mtk-afe-pcm.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/sound/soc/mediatek/mtk-afe-pcm.c b/sound/soc/mediatek/mtk-afe-pcm.c index 689c51f..3456bfa 100644 --- a/sound/soc/mediatek/mtk-afe-pcm.c +++ b/sound/soc/mediatek/mtk-afe-pcm.c @@ -283,20 +283,13 @@ static void mtk_afe_set_i2s_enable(struct mtk_afe *afe, bool enable) regmap_read(afe->regmap, AFE_I2S_CON2, &val); if (!!(val & AFE_I2S_CON2_EN) == enable) - return; /* must skip soft reset */ - - /* I2S soft reset begin */ - regmap_update_bits(afe->regmap, AUDIO_TOP_CON1, 0x4, 0x4); + return; /* input */ regmap_update_bits(afe->regmap, AFE_I2S_CON2, 0x1, enable); /* output */ regmap_update_bits(afe->regmap, AFE_I2S_CON1, 0x1, enable); - - /* I2S soft reset end */ - udelay(1); - regmap_update_bits(afe->regmap, AUDIO_TOP_CON1, 0x4, 0); } static int mtk_afe_dais_enable_clks(struct mtk_afe *afe, @@ -365,6 +358,7 @@ static int mtk_afe_i2s_startup(struct snd_pcm_substream *substream, return 0; mtk_afe_dais_enable_clks(afe, afe->clocks[MTK_CLK_I2S1_M], NULL); + mtk_afe_dais_enable_clks(afe, afe->clocks[MTK_CLK_I2S2_M], NULL); regmap_update_bits(afe->regmap, AUDIO_TOP_CON0, AUD_TCON0_PDN_22M | AUD_TCON0_PDN_24M, 0); return 0; @@ -384,6 +378,7 @@ static void mtk_afe_i2s_shutdown(struct snd_pcm_substream *substream, AUD_TCON0_PDN_22M | AUD_TCON0_PDN_24M, AUD_TCON0_PDN_22M | AUD_TCON0_PDN_24M); mtk_afe_dais_disable_clks(afe, afe->clocks[MTK_CLK_I2S1_M], NULL); + mtk_afe_dais_disable_clks(afe, afe->clocks[MTK_CLK_I2S2_M], NULL); } static int mtk_afe_i2s_prepare(struct snd_pcm_substream *substream, @@ -397,6 +392,9 @@ static int mtk_afe_i2s_prepare(struct snd_pcm_substream *substream, mtk_afe_dais_set_clks(afe, afe->clocks[MTK_CLK_I2S1_M], runtime->rate * 256, NULL, 0); + mtk_afe_dais_set_clks(afe, + afe->clocks[MTK_CLK_I2S2_M], runtime->rate * 256, + NULL, 0); /* config I2S */ ret = mtk_afe_set_i2s(afe, substream->runtime->rate); if (ret) -- 1.7.9.5

2 1

[alsa-devel] [RESEND PATCH] ASoC: cs4271: add regulator consumer support
by pascal.huerst＠gmail.com 26 Feb '16

26 Feb '16

From: Pascal Huerst <pascal.huerst(a)gmail.com> The cs4271 has three power domains: vd, vl and va. Enable them all, as long as the codec is in use. While at it, factored out the reset code into its own function. Signed-off-by: Pascal Huerst <pascal.huerst(a)gmail.com> --- Documentation/devicetree/bindings/sound/cs4271.txt | 7 +++ sound/soc/codecs/cs4271.c | 69 +++++++++++++++++++--- 2 files changed, 68 insertions(+), 8 deletions(-) diff --git a/Documentation/devicetree/bindings/sound/cs4271.txt b/Documentation/devicetree/bindings/sound/cs4271.txt index e2cd1d7..6e699ce 100644 --- a/Documentation/devicetree/bindings/sound/cs4271.txt +++ b/Documentation/devicetree/bindings/sound/cs4271.txt @@ -33,12 +33,19 @@ Optional properties: Note that this is not needed in case the clocks are stable throughout the entire runtime of the codec. + - vd-supply: Digital power + - vl-supply: Logic power + - va-supply: Analog Power + Examples: codec_i2c: cs4271@10 { compatible = "cirrus,cs4271"; reg = <0x10>; reset-gpio = <&gpio 23 0>; + vd-supply = <&vdd_3v3_reg>; + vl-supply = <&vdd_3v3_reg>; + va-supply = <&vdd_3v3_reg>; }; codec_spi: cs4271@0 { diff --git a/sound/soc/codecs/cs4271.c b/sound/soc/codecs/cs4271.c index e770ee6..0c0010b 100644 --- a/sound/soc/codecs/cs4271.c +++ b/sound/soc/codecs/cs4271.c @@ -26,6 +26,7 @@ #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_gpio.h> +#include <linux/regulator/consumer.h> #include <sound/pcm.h> #include <sound/soc.h> #include <sound/tlv.h> @@ -157,6 +158,10 @@ static bool cs4271_volatile_reg(struct device *dev, unsigned int reg) return reg == CS4271_CHIPID; } +static const char * const supply_names[] = { + "vd", "vl", "va" +}; + struct cs4271_private { unsigned int mclk; bool master; @@ -170,6 +175,7 @@ struct cs4271_private { int gpio_disable; /* enable soft reset workaround */ bool enable_soft_reset; + struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)]; }; static const struct snd_soc_dapm_widget cs4271_dapm_widgets[] = { @@ -487,6 +493,20 @@ static struct snd_soc_dai_driver cs4271_dai = { .symmetric_rates = 1, }; +static int cs4271_reset(struct snd_soc_codec *codec) +{ + struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec); + + if (gpio_is_valid(cs4271->gpio_nreset)) { + gpio_set_value(cs4271->gpio_nreset, 0); + mdelay(1); + gpio_set_value(cs4271->gpio_nreset, 1); + mdelay(1); + } + + return 0; +} + #ifdef CONFIG_PM static int cs4271_soc_suspend(struct snd_soc_codec *codec) { @@ -499,6 +519,9 @@ static int cs4271_soc_suspend(struct snd_soc_codec *codec) if (ret < 0) return ret; + regcache_mark_dirty(cs4271->regmap); + regulator_bulk_disable(ARRAY_SIZE(cs4271->supplies), cs4271->supplies); + return 0; } @@ -507,6 +530,16 @@ static int cs4271_soc_resume(struct snd_soc_codec *codec) int ret; struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec); + ret = regulator_bulk_enable(ARRAY_SIZE(cs4271->supplies), + cs4271->supplies); + if (ret < 0) { + dev_err(codec->dev, "Failed to enable regulators: %d\n", ret); + return ret; + } + + /* Do a proper reset after power up */ + cs4271_reset(codec); + /* Restore codec state */ ret = regcache_sync(cs4271->regmap); if (ret < 0) @@ -553,19 +586,24 @@ static int cs4271_codec_probe(struct snd_soc_codec *codec) } #endif + ret = regulator_bulk_enable(ARRAY_SIZE(cs4271->supplies), + cs4271->supplies); + if (ret < 0) { + dev_err(codec->dev, "Failed to enable regulators: %d\n", ret); + return ret; + } + if (cs4271plat) { amutec_eq_bmutec = cs4271plat->amutec_eq_bmutec; cs4271->enable_soft_reset = cs4271plat->enable_soft_reset; } - if (gpio_is_valid(cs4271->gpio_nreset)) { - /* Reset codec */ - gpio_direction_output(cs4271->gpio_nreset, 0); - mdelay(1); - gpio_set_value(cs4271->gpio_nreset, 1); - /* Give the codec time to wake up */ - mdelay(1); - } + /* Reset codec */ + cs4271_reset(codec); + + ret = regcache_sync(cs4271->regmap); + if (ret < 0) + return ret; ret = regmap_update_bits(cs4271->regmap, CS4271_MODE2, CS4271_MODE2_PDN | CS4271_MODE2_CPEN, @@ -595,6 +633,9 @@ static int cs4271_codec_remove(struct snd_soc_codec *codec) /* Set codec to the reset state */ gpio_set_value(cs4271->gpio_nreset, 0); + regcache_mark_dirty(cs4271->regmap); + regulator_bulk_disable(ARRAY_SIZE(cs4271->supplies), cs4271->supplies); + return 0; }; @@ -617,6 +658,7 @@ static int cs4271_common_probe(struct device *dev, { struct cs4271_platform_data *cs4271plat = dev->platform_data; struct cs4271_private *cs4271; + int i, ret; cs4271 = devm_kzalloc(dev, sizeof(*cs4271), GFP_KERNEL); if (!cs4271) @@ -638,6 +680,17 @@ static int cs4271_common_probe(struct device *dev, return ret; } + for (i = 0; i < ARRAY_SIZE(supply_names); i++) + cs4271->supplies[i].supply = supply_names[i]; + + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(cs4271->supplies), + cs4271->supplies); + + if (ret < 0) { + dev_err(dev, "Failed to get regulators: %d\n", ret); + return ret; + } + *c = cs4271; return 0; } -- 2.4.3

2 1

[alsa-devel] [PATCH 0/1] ALSA: hda - Use acpi_dev_present()
by Lukas Wunner 25 Feb '16

25 Feb '16

Hi Takashi, the acpi_dev_present() API has now landed in Linus' tree. Thus, after Linus' tree gets merged back into yours, it would be possible to use the API in the Thinkpad hda drivers as per the following patch. I've also pushed it to GitHub in case anyone prefers perusing it in a browser: https://github.com/l1k/linux/commit/a1473d726b57eaf97c4de8812c5967603068e261 An ack for this patch was kindly provided by Hui Wang with: Message-ID: <5653C291.9090607(a)canonical.com> http://mailman.alsa-project.org/pipermail/alsa-devel/2015-November/100962.h… Thanks, Lukas Lukas Wunner (1): ALSA: hda - Use acpi_dev_present() sound/pci/hda/thinkpad_helper.c | 17 ++--------------- 1 file changed, 2 insertions(+), 15 deletions(-) -- 2.1.0

3 8