base/regmap/regmap-slimbus.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 // Copyright (c) 2017, Linaro Ltd.
0003
0004 #include <linux/regmap.h>
0005 #include <linux/slimbus.h>
0006 #include <linux/module.h>
0007
0008 #include "internal.h"
0009
0010 static int regmap_slimbus_write(void *context, const void *data, size_t count)
0011 {
0012     struct slim_device *sdev = context;
0013
0014     return slim_write(sdev, *(u16 *)data, count - 2, (u8 *)data + 2);
0015 }
0016
0017 static int regmap_slimbus_read(void *context, const void *reg, size_t reg_size,
0018                    void *val, size_t val_size)
0019 {
0020     struct slim_device *sdev = context;
0021
0022     return slim_read(sdev, *(u16 *)reg, val_size, val);
0023 }
0024
0025 static const struct regmap_bus regmap_slimbus_bus = {
0026     .write = regmap_slimbus_write,
0027     .read = regmap_slimbus_read,
0028     .reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
0029     .val_format_endian_default = REGMAP_ENDIAN_LITTLE,
0030 };
0031
0032 static const struct regmap_bus *regmap_get_slimbus(struct slim_device *slim,
0033                     const struct regmap_config *config)
0034 {
0035     if (config->val_bits == 8 && config->reg_bits == 16)
0036         return &regmap_slimbus_bus;
0037
0038     return ERR_PTR(-ENOTSUPP);
0039 }
0040
0041 struct regmap *__regmap_init_slimbus(struct slim_device *slimbus,
0042                      const struct regmap_config *config,
0043                      struct lock_class_key *lock_key,
0044                      const char *lock_name)
0045 {
0046     const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config);
0047
0048     if (IS_ERR(bus))
0049         return ERR_CAST(bus);
0050
0051     return __regmap_init(&slimbus->dev, bus, &slimbus->dev, config,
0052                  lock_key, lock_name);
0053 }
0054 EXPORT_SYMBOL_GPL(__regmap_init_slimbus);
0055
0056 struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus,
0057                       const struct regmap_config *config,
0058                       struct lock_class_key *lock_key,
0059                       const char *lock_name)
0060 {
0061     const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config);
0062
0063     if (IS_ERR(bus))
0064         return ERR_CAST(bus);
0065
0066     return __devm_regmap_init(&slimbus->dev, bus, &slimbus, config,
0067                   lock_key, lock_name);
0068 }
0069 EXPORT_SYMBOL_GPL(__devm_regmap_init_slimbus);
0070
0071 MODULE_LICENSE("GPL v2");