[PATCH v3 5/8] regmap: rsb: Add support for Reduced Serial Bus (RSB) based regmaps

From: Chen-Yu Tsai
Date: Wed Aug 19 2015 - 00:23:04 EST

Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
---
drivers/base/regmap/Kconfig | 6 +-
drivers/base/regmap/Makefile | 1 +
drivers/base/regmap/regmap-rsb.c | 121 +++++++++++++++++++++++++++++++++++++++
include/linux/regmap.h | 36 ++++++++++++
4 files changed, 163 insertions(+), 1 deletion(-)
create mode 100644 drivers/base/regmap/regmap-rsb.c

diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
index db9d00c36a3e..afb41994c51e 100644
--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
@@ -3,7 +3,7 @@
# subsystems should select the appropriate symbols.

config REGMAP
- default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ)
+ default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_RSB || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ)
select LZO_COMPRESS
select LZO_DECOMPRESS
select IRQ_DOMAIN if REGMAP_IRQ
@@ -24,6 +24,10 @@ config REGMAP_SPMI
tristate
depends on SPMI

+config REGMAP_RSB
+ tristate
+ depends on RSB
+
config REGMAP_MMIO
tristate

diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile
index 609e4c84f485..dad32b3903d4 100644
--- a/drivers/base/regmap/Makefile
+++ b/drivers/base/regmap/Makefile
@@ -8,5 +8,6 @@ obj-$(CONFIG_REGMAP_AC97) += regmap-ac97.o
obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o
+obj-$(CONFIG_REGMAP_RSB) += regmap-rsb.o
obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o
obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o
diff --git a/drivers/base/regmap/regmap-rsb.c b/drivers/base/regmap/regmap-rsb.c
new file mode 100644
index 000000000000..e82aa980abe1
--- /dev/null
+++ b/drivers/base/regmap/regmap-rsb.c
@@ -0,0 +1,121 @@
+/*
+ * Register map access API - RSB support
+ *
+ * Copyright 2015 Chen-Yu Tsai
+ *
+ * Chen-Yu Tsai <wens@xxxxxxxx>
+ *
+ * Based on regmap-i2c.c
+ *
+ * Copyright 2011 Wolfson Microelectronics plc
+ *
+ * Author: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/regmap.h>
+#include <linux/rsb.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include "internal.h"
+
+struct rsb_context {
+ struct rsb_device *rsb;
+ int size;
+};
+
+static int regmap_rsb_reg_read(void *context, unsigned int reg,
+ unsigned int *val)
+{
+ struct rsb_context *ctx = context;
+ struct rsb_device *rsb = ctx->rsb;
+
+ if (reg > 0xff)
+ return -EINVAL;
+
+ return rsb_register_read(rsb, reg, val, ctx->size);
+}
+
+static int regmap_rsb_reg_write(void *context, unsigned int reg,
+ unsigned int val)
+{
+ struct rsb_context *ctx = context;
+ struct rsb_device *rsb = ctx->rsb;
+
+ return rsb_register_write(rsb, reg, val, ctx->size);
+}
+
+static void regmap_rsb_free_context(void *context)
+{
+ struct rsb_context *ctx = context;
+
+ kfree(ctx);
+}
+
+static struct regmap_bus regmap_rsb = {
+ .reg_write = regmap_rsb_reg_write,
+ .reg_read = regmap_rsb_reg_read,
+ .free_context = regmap_rsb_free_context,
+ .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
+ .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
+};
+
+static struct rsb_context *regmap_rsb_init_context(struct rsb_device *rsb,
+ const struct regmap_config *config)
+{
+ struct rsb_context *ctx;
+
+ switch (config->val_bits) {
+ case 8:
+ case 16:
+ case 32:
+ break;
+ default:
+ return ERR_PTR(-EINVAL);
+ }
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+
+ ctx->rsb = rsb;
+ ctx->size = config->val_bits / 8;
+
+ return ctx;
+}
+
+struct regmap *__regmap_init_rsb(struct rsb_device *rsb,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name)
+{
+ struct rsb_context *ctx = regmap_rsb_init_context(rsb, config);
+
+ if (IS_ERR(ctx))
+ return ERR_CAST(ctx);
+
+ return __regmap_init(&rsb->dev, &regmap_rsb, ctx, config,
+ lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__regmap_init_rsb);
+
+struct regmap *__devm_regmap_init_rsb(struct rsb_device *rsb,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name)
+{
+ struct rsb_context *ctx = regmap_rsb_init_context(rsb, config);
+
+ if (IS_ERR(ctx))
+ return ERR_CAST(ctx);
+
+ return __devm_regmap_init(&rsb->dev, &regmap_rsb, ctx, config,
+ lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__devm_regmap_init_rsb);
+
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 17178317bcec..df94574b1d37 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -25,6 +25,7 @@ struct i2c_client;
struct irq_domain;
struct spi_device;
struct spmi_device;
+struct rsb_device;
struct regmap;
struct regmap_range_cfg;
struct regmap_field;
@@ -377,6 +378,10 @@ struct regmap *__regmap_init_ac97(struct snd_ac97 *ac97,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
+struct regmap *__regmap_init_rsb(struct rsb_device *rsb,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name);

struct regmap *__devm_regmap_init(struct device *dev,
const struct regmap_bus *bus,
@@ -410,6 +415,10 @@ struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
+struct regmap *__devm_regmap_init_rsb(struct rsb_device *rsb,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name);

/*
* Wrapper for regmap_init macros to include a unique lockdep key and name
@@ -544,6 +553,19 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);

/**
+ * regmap_init_rsb(): Initialise register map
+ *
+ * @rsb: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer to
+ * a struct regmap.
+ */
+#define regmap_init_rsb(rsb, config) \
+ __regmap_lockdep_wrapper(__regmap_init_rsb, #config, \
+ rsb, config)
+
+/**
* devm_regmap_init(): Initialise managed register map
*
* @dev: Device that will be interacted with
@@ -658,6 +680,20 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
__regmap_lockdep_wrapper(__devm_regmap_init_ac97, #config, \
ac97, config)

+/**
+ * devm_regmap_init_rsb(): Initialise managed register map
+ *
+ * @rsb: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap. The regmap will be automatically freed by the
+ * device management code.
+ */
+#define devm_regmap_init_rsb(rsb, config) \
+ __regmap_lockdep_wrapper(__devm_regmap_init_rsb, #config, \
+ rsb, config)
+
void regmap_exit(struct regmap *map);
int regmap_reinit_cache(struct regmap *map,
const struct regmap_config *config);
--
2.5.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/