[PATCH v4 1/3] DRM: add help to get ELD speaker allocation

From: Arnaud Pouliquen <arnaud.pouliquen@st.com>
To: alsa-devel@alsa-project.org, dri-devel@lists.freedesktop.org
Cc: Jani Nikula <jani.nikula@intel.com>,
	broonie@kernel.org, lgirdwood@gmail.com,
	Jyri Sarha <jsarha@ti.com>
Subject: [PATCH v4 1/3] DRM: add help to get ELD speaker allocation
Date: Tue, 3 Jan 2017 16:52:50 +0100	[thread overview]
Message-ID: <1483458772-13658-2-git-send-email-arnaud.pouliquen@st.com> (raw)
In-Reply-To: <1483458772-13658-1-git-send-email-arnaud.pouliquen@st.com>

Add helper to allow users to retrieve the speaker allocations without
knowledge of the ELD structure.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
---
 include/drm/drm_edid.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index c3a7d44..de93543 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -248,6 +248,7 @@ struct detailed_timing {
 # define DRM_ELD_AUD_SYNCH_DELAY_MAX	0xfa	/* 500 ms */
 
 #define DRM_ELD_SPEAKER			7
+# define DRM_ELD_SPEAKER_MASK		0x7f
 # define DRM_ELD_SPEAKER_RLRC		(1 << 6)
 # define DRM_ELD_SPEAKER_FLRC		(1 << 5)
 # define DRM_ELD_SPEAKER_RC		(1 << 4)
@@ -415,6 +416,18 @@ static inline int drm_eld_size(const uint8_t *eld)
 }
 
 /**
+ * drm_eld_get_spk_alloc - Get speaker allocation
+ * @eld: pointer to an ELD memory structure
+ *
+ * The returned value is the speakers mask. User has to use %DRM_ELD_SPEAKER
+ * field definitions to identify speakers.
+ */
+static inline u8 drm_eld_get_spk_alloc(const uint8_t *eld)
+{
+	return eld[DRM_ELD_SPEAKER] & DRM_ELD_SPEAKER_MASK;
+}
+
+/**
  * drm_eld_get_conn_type - Get device type hdmi/dp connected
  * @eld: pointer to an ELD memory structure
  *
-- 
1.9.1

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