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-rw-r--r--sound/soc/codecs/cirrus_legacy.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/sound/soc/codecs/cirrus_legacy.h b/sound/soc/codecs/cirrus_legacy.h
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+++ b/sound/soc/codecs/cirrus_legacy.h
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Some small helpers for older Cirrus Logic parts.
+ *
+ * Copyright (C) 2021 Cirrus Logic, Inc. and
+ * Cirrus Logic International Semiconductor Ltd.
+ */
+
+static inline int cirrus_read_device_id(struct regmap *regmap, unsigned int reg)
+{
+ u8 devid[3];
+ int ret;
+
+ ret = regmap_bulk_read(regmap, reg, devid, ARRAY_SIZE(devid));
+ if (ret < 0)
+ return ret;
+
+ return ((devid[0] & 0xFF) << 12) |
+ ((devid[1] & 0xFF) << 4) |
+ ((devid[2] & 0xF0) >> 4);
+}