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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 | // SPDX-License-Identifier: GPL-2.0 // // Register map access API - I2C support // // Copyright 2011 Wolfson Microelectronics plc // // Author: Mark Brown <broonie@opensource.wolfsonmicro.com> #include <linux/regmap.h> #include <linux/i2c.h> #include <linux/module.h> #include "internal.h" static int regmap_smbus_byte_reg_read(void *context, unsigned int reg, unsigned int *val) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); int ret; if (reg > 0xff) return -EINVAL; ret = i2c_smbus_read_byte_data(i2c, reg); if (ret < 0) return ret; *val = ret; return 0; } static int regmap_smbus_byte_reg_write(void *context, unsigned int reg, unsigned int val) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); if (val > 0xff || reg > 0xff) return -EINVAL; return i2c_smbus_write_byte_data(i2c, reg, val); } static const struct regmap_bus regmap_smbus_byte = { .reg_write = regmap_smbus_byte_reg_write, .reg_read = regmap_smbus_byte_reg_read, }; static int regmap_smbus_word_reg_read(void *context, unsigned int reg, unsigned int *val) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); int ret; if (reg > 0xff) return -EINVAL; ret = i2c_smbus_read_word_data(i2c, reg); if (ret < 0) return ret; *val = ret; return 0; } static int regmap_smbus_word_reg_write(void *context, unsigned int reg, unsigned int val) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); if (val > 0xffff || reg > 0xff) return -EINVAL; return i2c_smbus_write_word_data(i2c, reg, val); } static const struct regmap_bus regmap_smbus_word = { .reg_write = regmap_smbus_word_reg_write, .reg_read = regmap_smbus_word_reg_read, }; static int regmap_smbus_word_read_swapped(void *context, unsigned int reg, unsigned int *val) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); int ret; if (reg > 0xff) return -EINVAL; ret = i2c_smbus_read_word_swapped(i2c, reg); if (ret < 0) return ret; *val = ret; return 0; } static int regmap_smbus_word_write_swapped(void *context, unsigned int reg, unsigned int val) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); if (val > 0xffff || reg > 0xff) return -EINVAL; return i2c_smbus_write_word_swapped(i2c, reg, val); } static const struct regmap_bus regmap_smbus_word_swapped = { .reg_write = regmap_smbus_word_write_swapped, .reg_read = regmap_smbus_word_read_swapped, }; static int regmap_i2c_write(void *context, const void *data, size_t count) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); int ret; ret = i2c_master_send(i2c, data, count); if (ret == count) return 0; else if (ret < 0) return ret; else return -EIO; } static int regmap_i2c_gather_write(void *context, const void *reg, size_t reg_size, const void *val, size_t val_size) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); struct i2c_msg xfer[2]; int ret; /* If the I2C controller can't do a gather tell the core, it * will substitute in a linear write for us. */ if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_NOSTART)) return -ENOTSUPP; xfer[0].addr = i2c->addr; xfer[0].flags = 0; xfer[0].len = reg_size; xfer[0].buf = (void *)reg; xfer[1].addr = i2c->addr; xfer[1].flags = I2C_M_NOSTART; xfer[1].len = val_size; xfer[1].buf = (void *)val; ret = i2c_transfer(i2c->adapter, xfer, 2); if (ret == 2) return 0; if (ret < 0) return ret; else return -EIO; } static int regmap_i2c_read(void *context, const void *reg, size_t reg_size, void *val, size_t val_size) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); struct i2c_msg xfer[2]; int ret; xfer[0].addr = i2c->addr; xfer[0].flags = 0; xfer[0].len = reg_size; xfer[0].buf = (void *)reg; xfer[1].addr = i2c->addr; xfer[1].flags = I2C_M_RD; xfer[1].len = val_size; xfer[1].buf = val; ret = i2c_transfer(i2c->adapter, xfer, 2); if (ret == 2) return 0; else if (ret < 0) return ret; else return -EIO; } static const struct regmap_bus regmap_i2c = { .write = regmap_i2c_write, .gather_write = regmap_i2c_gather_write, .read = regmap_i2c_read, .reg_format_endian_default = REGMAP_ENDIAN_BIG, .val_format_endian_default = REGMAP_ENDIAN_BIG, }; static int regmap_i2c_smbus_i2c_write(void *context, const void *data, size_t count) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); if (count < 1) return -EINVAL; --count; return i2c_smbus_write_i2c_block_data(i2c, ((u8 *)data)[0], count, ((u8 *)data + 1)); } static int regmap_i2c_smbus_i2c_read(void *context, const void *reg, size_t reg_size, void *val, size_t val_size) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); int ret; if (reg_size != 1 || val_size < 1) return -EINVAL; ret = i2c_smbus_read_i2c_block_data(i2c, ((u8 *)reg)[0], val_size, val); if (ret == val_size) return 0; else if (ret < 0) return ret; else return -EIO; } static const struct regmap_bus regmap_i2c_smbus_i2c_block = { .write = regmap_i2c_smbus_i2c_write, .read = regmap_i2c_smbus_i2c_read, .max_raw_read = I2C_SMBUS_BLOCK_MAX, .max_raw_write = I2C_SMBUS_BLOCK_MAX, }; static int regmap_i2c_smbus_i2c_write_reg16(void *context, const void *data, size_t count) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); if (count < 2) return -EINVAL; count--; return i2c_smbus_write_i2c_block_data(i2c, ((u8 *)data)[0], count, (u8 *)data + 1); } static int regmap_i2c_smbus_i2c_read_reg16(void *context, const void *reg, size_t reg_size, void *val, size_t val_size) { struct device *dev = context; struct i2c_client *i2c = to_i2c_client(dev); int ret, count, len = val_size; if (reg_size != 2) return -EINVAL; ret = i2c_smbus_write_byte_data(i2c, ((u16 *)reg)[0] & 0xff, ((u16 *)reg)[0] >> 8); if (ret < 0) return ret; count = 0; do { /* Current Address Read */ ret = i2c_smbus_read_byte(i2c); if (ret < 0) break; *((u8 *)val++) = ret; count++; len--; } while (len > 0); if (count == val_size) return 0; else if (ret < 0) return ret; else return -EIO; } static const struct regmap_bus regmap_i2c_smbus_i2c_block_reg16 = { .write = regmap_i2c_smbus_i2c_write_reg16, .read = regmap_i2c_smbus_i2c_read_reg16, .max_raw_read = I2C_SMBUS_BLOCK_MAX, .max_raw_write = I2C_SMBUS_BLOCK_MAX, }; static const struct regmap_bus *regmap_get_i2c_bus(struct i2c_client *i2c, const struct regmap_config *config) { if (i2c_check_functionality(i2c->adapter, I2C_FUNC_I2C)) return ®map_i2c; else if (config->val_bits == 8 && config->reg_bits == 8 && i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) return ®map_i2c_smbus_i2c_block; else if (config->val_bits == 8 && config->reg_bits == 16 && i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) return ®map_i2c_smbus_i2c_block_reg16; else if (config->val_bits == 16 && config->reg_bits == 8 && i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_WORD_DATA)) switch (regmap_get_val_endian(&i2c->dev, NULL, config)) { case REGMAP_ENDIAN_LITTLE: return ®map_smbus_word; case REGMAP_ENDIAN_BIG: return ®map_smbus_word_swapped; default: /* everything else is not supported */ break; } else if (config->val_bits == 8 && config->reg_bits == 8 && i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return ®map_smbus_byte; return ERR_PTR(-ENOTSUPP); } struct regmap *__regmap_init_i2c(struct i2c_client *i2c, const struct regmap_config *config, struct lock_class_key *lock_key, const char *lock_name) { const struct regmap_bus *bus = regmap_get_i2c_bus(i2c, config); if (IS_ERR(bus)) return ERR_CAST(bus); return __regmap_init(&i2c->dev, bus, &i2c->dev, config, lock_key, lock_name); } EXPORT_SYMBOL_GPL(__regmap_init_i2c); struct regmap *__devm_regmap_init_i2c(struct i2c_client *i2c, const struct regmap_config *config, struct lock_class_key *lock_key, const char *lock_name) { const struct regmap_bus *bus = regmap_get_i2c_bus(i2c, config); if (IS_ERR(bus)) return ERR_CAST(bus); return __devm_regmap_init(&i2c->dev, bus, &i2c->dev, config, lock_key, lock_name); } EXPORT_SYMBOL_GPL(__devm_regmap_init_i2c); MODULE_LICENSE("GPL"); |