/*
 * mtk-afe-fe-dais.h  --  Mediatek afe fe dai operator definition
 *
 * Copyright (c) 2016 MediaTek Inc.
 * Author: Garlic Tseng <garlic.tseng@mediatek.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef _MTK_AFE_FE_DAI_H_
#define _MTK_AFE_FE_DAI_H_

struct snd_soc_dai_ops;
struct mtk_base_afe;
struct mtk_base_afe_memif;

int mtk_afe_fe_startup(struct snd_pcm_substream *substream,
		       struct snd_soc_dai *dai);
void mtk_afe_fe_shutdown(struct snd_pcm_substream *substream,
			 struct snd_soc_dai *dai);
int mtk_afe_fe_hw_params(struct snd_pcm_substream *substream,
			 struct snd_pcm_hw_params *params,
			 struct snd_soc_dai *dai);
int mtk_afe_fe_hw_free(struct snd_pcm_substream *substream,
		       struct snd_soc_dai *dai);
int mtk_afe_fe_prepare(struct snd_pcm_substream *substream,
		       struct snd_soc_dai *dai);
int mtk_afe_fe_trigger(struct snd_pcm_substream *substream, int cmd,
		       struct snd_soc_dai *dai);

extern const struct snd_soc_dai_ops mtk_afe_fe_ops;

int mtk_dynamic_irq_acquire(struct mtk_base_afe *afe);
int mtk_dynamic_irq_release(struct mtk_base_afe *afe, int irq_id);
int mtk_afe_dai_suspend(struct snd_soc_dai *dai);
int mtk_afe_dai_resume(struct snd_soc_dai *dai);

#endif
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<tr><th>author</th><td>Takashi Sakamoto &lt;o-takashi@sakamocchi.jp&gt;</td><td class='right'>2016-12-16 18:26:54 +0900</td></tr>
<tr><th>committer</th><td>Mark Brown &lt;broonie@kernel.org&gt;</td><td class='right'>2016-12-16 12:27:35 +0000</td></tr>
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<div class='commit-subject'>ASoC: hdmi-codec: use unsigned type to structure members with bit-field</div><div class='commit-msg'>This is a fix for Linux 4.10-rc1.

In C language specification, a bit-field is interpreted as a signed or
unsigned integer type consisting of the specified number of bits.

In GCC manual, the range of a signed bit field of N bits is from
-(2^N) / 2 to ((2^N) / 2) - 1
https://www.gnu.org/software/gnu-c-manual/gnu-c-manual.html#Bit-Fields

Therefore, when defined as 1 bit-field with signed type, variables can
represents -1 and 0.

The snd-soc-hdmi-codec module includes a structure which has signed type
members with bit-fields. Codes of this module assign 0 and 1 to the
members. This seems to result in implementation-dependent behaviours.

As of v4.10-rc1 merge window, outside of sound subsystem, this structure
is referred by below GPU modules.
 - tda998x
 - sti-drm
 - mediatek-drm-hdmi
 - msm

As long as I review their codes relevant to the structure, the structure
members are used just for condition statements and printk formats.
My proposal of change is a bit intrusive to the printk formats but this
may be acceptable.

Totally, it's reasonable to use unsigned type for the structure members.
This bug is detected by Sparse, static code analyzer with below warnings.

./include/sound/hdmi-codec.h:39:26: error: dubious one-bit signed bitfield
./include/sound/hdmi-codec.h:40:28: error: dubious one-bit signed bitfield
./include/sound/hdmi-codec.h:41:29: error: dubious one-bit signed bitfield
./include/sound/hdmi-codec.h:42:31: error: dubious one-bit signed bitfield

Fixes: 09184118a8ab ("ASoC: hdmi-codec: Add hdmi-codec for external HDMI-encoders")
Signed-off-by: Takashi Sakamoto &lt;o-takashi@sakamocchi.jp&gt;
Acked-by: Arnaud Pouliquen &lt;arnaud.pouliquen@st.com&gt;
Signed-off-by: Mark Brown &lt;broonie@kernel.org&gt;
CC: stable@vger.kernel.org
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