1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2017, Linaro Ltd. 3 4 #include <linux/regmap.h> 5 #include <linux/slimbus.h> 6 #include <linux/module.h> 7 8 #include "internal.h" 9 10 static int regmap_slimbus_write(void *context, const void *data, size_t count) 11 { 12 struct slim_device *sdev = context; 13 14 return slim_write(sdev, *(u16 *)data, count - 2, (u8 *)data + 2); 15 } 16 17 static int regmap_slimbus_read(void *context, const void *reg, size_t reg_size, 18 void *val, size_t val_size) 19 { 20 struct slim_device *sdev = context; 21 22 return slim_read(sdev, *(u16 *)reg, val_size, val); 23 } 24 25 static const struct regmap_bus regmap_slimbus_bus = { 26 .write = regmap_slimbus_write, 27 .read = regmap_slimbus_read, 28 .reg_format_endian_default = REGMAP_ENDIAN_LITTLE, 29 .val_format_endian_default = REGMAP_ENDIAN_LITTLE, 30 }; 31 32 static const struct regmap_bus *regmap_get_slimbus(struct slim_device *slim, 33 const struct regmap_config *config) 34 { 35 if (config->val_bits == 8 && config->reg_bits == 16) 36 return ®map_slimbus_bus; 37 38 return ERR_PTR(-ENOTSUPP); 39 } 40 41 struct regmap *__regmap_init_slimbus(struct slim_device *slimbus, 42 const struct regmap_config *config, 43 struct lock_class_key *lock_key, 44 const char *lock_name) 45 { 46 const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config); 47 48 if (IS_ERR(bus)) 49 return ERR_CAST(bus); 50 51 return __regmap_init(&slimbus->dev, bus, slimbus, config, lock_key, lock_name); 52 } 53 EXPORT_SYMBOL_GPL(__regmap_init_slimbus); 54 55 struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus, 56 const struct regmap_config *config, 57 struct lock_class_key *lock_key, 58 const char *lock_name) 59 { 60 const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config); 61 62 if (IS_ERR(bus)) 63 return ERR_CAST(bus); 64 65 return __devm_regmap_init(&slimbus->dev, bus, slimbus, config, lock_key, lock_name); 66 } 67 EXPORT_SYMBOL_GPL(__devm_regmap_init_slimbus); 68 69 MODULE_DESCRIPTION("Register map access API - SLIMbus support"); 70 MODULE_LICENSE("GPL v2"); 71