linux-kernel - [PATCH 6/8] msm: scm: Add a feat version query API

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Date:	Mon,  4 Aug 2014 18:31:48 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	David Brown <davidb@...eaurora.org>,
	Kumar Gala <galak@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Lina Iyer <lina.iyer@...aro.org>
Subject: [PATCH 6/8] msm: scm: Add a feat version query API

Some users of SCM need to detect features and also detect if
those features have certain versions available. Add this API.

Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
---
 arch/arm/mach-qcom/scm.c | 13 +++++++++++++
 arch/arm/mach-qcom/scm.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/arch/arm/mach-qcom/scm.c b/arch/arm/mach-qcom/scm.c
index e80571f57ca4..7c62c03324f4 100644
--- a/arch/arm/mach-qcom/scm.c
+++ b/arch/arm/mach-qcom/scm.c
@@ -410,3 +410,16 @@ int scm_is_call_available(u32 svc_id, u32 cmd_id)
 	return ret_val;
 }
 EXPORT_SYMBOL(scm_is_call_available);
+
+#define GET_FEAT_VERSION_CMD	3
+int scm_get_feat_version(u32 feat)
+{
+	if (scm_is_call_available(SCM_SVC_INFO, GET_FEAT_VERSION_CMD)) {
+		u32 version;
+		if (!scm_call(SCM_SVC_INFO, GET_FEAT_VERSION_CMD, &feat,
+				sizeof(feat), &version, sizeof(version)))
+			return version;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(scm_get_feat_version);
diff --git a/arch/arm/mach-qcom/scm.h b/arch/arm/mach-qcom/scm.h
index f94c7279616a..6348b08524e7 100644
--- a/arch/arm/mach-qcom/scm.h
+++ b/arch/arm/mach-qcom/scm.h
@@ -26,5 +26,6 @@ extern s32 scm_call_atomic2(u32 svc, u32 cmd, u32 arg1, u32 arg2);
 
 extern u32 scm_get_version(void);
 extern int scm_is_call_available(u32 svc_id, u32 cmd_id);
+extern int scm_get_feat_version(u32 feat);
 
 #endif
-- 
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