GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/drivers/sound/maxim_codec.c

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+// SPDX-License-Identifier: GPL-2.0
+/*
+ * maxim_codec.c -- MAXIM CODEC Common driver
+ *
+ * Copyright 2011 Maxim Integrated Products
+ */
+
+#include <common.h>
+#include <div64.h>
+#include <i2c.h>
+#include <i2s.h>
+#include <sound.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include "maxim_codec.h"
+
+/*
+ * Writes value to a device register through i2c
+ *
+ * @param priv	Private data for driver
+ * @param reg	reg number to be write
+ * @param data	data to be writen to the above registor
+ *
+ * @return	int value 1 for change, 0 for no change or negative error code.
+ */
+int maxim_i2c_write(struct maxim_priv *priv, unsigned int reg,
+		    unsigned char data)
+{
+	debug("%s: Write Addr : 0x%02X, Data :  0x%02X\n",
+	      __func__, reg, data);
+	return dm_i2c_write(priv->dev, reg, &data, 1);
+}
+
+/*
+ * Read a value from a device register through i2c
+ *
+ * @param priv	Private data for driver
+ * @param reg	reg number to be read
+ * @param data	address of read data to be stored
+ *
+ * @return	int value 0 for success, -1 in case of error.
+ */
+unsigned int maxim_i2c_read(struct maxim_priv *priv, unsigned int reg,
+			    unsigned char *data)
+{
+	int ret;
+
+	return dm_i2c_read(priv->dev, reg, data, 1);
+	if (ret != 0) {
+		debug("%s: Error while reading register %#04x\n",
+		      __func__, reg);
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * update device register bits through i2c
+ *
+ * @param priv	Private data for driver
+ * @param reg	codec register
+ * @param mask	register mask
+ * @param value	new value
+ *
+ * @return int value 0 for success, non-zero error code.
+ */
+int maxim_bic_or(struct maxim_priv *priv, unsigned int reg, unsigned char mask,
+		 unsigned char value)
+{
+	int change, ret = 0;
+	unsigned char old, new;
+
+	if (maxim_i2c_read(priv, reg, &old) != 0)
+		return -1;
+	new = (old & ~mask) | (value & mask);
+	change  = (old != new) ? 1 : 0;
+	if (change)
+		ret = maxim_i2c_write(priv, reg, new);
+	if (ret < 0)
+		return ret;
+
+	return change;
+}