commit b04a402ae4328aad41335d93cebd3484973ab7c2
author xj <xj@example.com> Thu Nov 25 15:01:52 2021 +0800
committer xj <xj@example.com> Thu Nov 25 15:01:52 2021 +0800
tree c1ddf06fa00e6d6f48f3bfe835e32671fe2bb9cc
parent d96e019c47e1271d3fdf4b291ee9c3c02bc16c07

[Feature] add GA346 baseline version

Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f

src/kernel/linux/v4.19/drivers/base/regmap/regmap-slimbus.c

diff --git a/src/kernel/linux/v4.19/drivers/base/regmap/regmap-slimbus.c b/src/kernel/linux/v4.19/drivers/base/regmap/regmap-slimbus.c
new file mode 100644
index 0000000..0968059
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/base/regmap/regmap-slimbus.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017, Linaro Ltd.
+
+#include <linux/regmap.h>
+#include <linux/slimbus.h>
+#include <linux/module.h>
+
+#include "internal.h"
+
+static int regmap_slimbus_write(void *context, const void *data, size_t count)
+{
+	struct slim_device *sdev = context;
+
+	return slim_write(sdev, *(u16 *)data, count - 2, (u8 *)data + 2);
+}
+
+static int regmap_slimbus_read(void *context, const void *reg, size_t reg_size,
+			       void *val, size_t val_size)
+{
+	struct slim_device *sdev = context;
+
+	return slim_read(sdev, *(u16 *)reg, val_size, val);
+}
+
+static struct regmap_bus regmap_slimbus_bus = {
+	.write = regmap_slimbus_write,
+	.read = regmap_slimbus_read,
+	.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
+	.val_format_endian_default = REGMAP_ENDIAN_LITTLE,
+};
+
+static const struct regmap_bus *regmap_get_slimbus(struct slim_device *slim,
+					const struct regmap_config *config)
+{
+	if (config->val_bits == 8 && config->reg_bits == 16)
+		return &regmap_slimbus_bus;
+
+	return ERR_PTR(-ENOTSUPP);
+}
+
+struct regmap *__regmap_init_slimbus(struct slim_device *slimbus,
+				     const struct regmap_config *config,
+				     struct lock_class_key *lock_key,
+				     const char *lock_name)
+{
+	const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config);
+
+	if (IS_ERR(bus))
+		return ERR_CAST(bus);
+
+	return __regmap_init(&slimbus->dev, bus, &slimbus->dev, config,
+			     lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__regmap_init_slimbus);
+
+struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus,
+					  const struct regmap_config *config,
+					  struct lock_class_key *lock_key,
+					  const char *lock_name)
+{
+	const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config);
+
+	if (IS_ERR(bus))
+		return ERR_CAST(bus);
+
+	return __devm_regmap_init(&slimbus->dev, bus, &slimbus, config,
+				  lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__devm_regmap_init_slimbus);
+
+MODULE_LICENSE("GPL v2");