| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Mark Brown | 500 | 25.67% | 3 | 20.00% |
| Boris Brezillon | 448 | 23.00% | 1 | 6.67% |
| AceLan Kao | 303 | 15.55% | 1 | 6.67% |
| Markus Pargmann | 229 | 11.76% | 1 | 6.67% |
| Guenter Roeck | 187 | 9.60% | 2 | 13.33% |
| Lucas Tanure | 183 | 9.39% | 1 | 6.67% |
| Stephen Warren | 42 | 2.16% | 2 | 13.33% |
| Nicolas Boichat | 34 | 1.75% | 1 | 6.67% |
| Xiubo Li | 10 | 0.51% | 1 | 6.67% |
| Greg Kroah-Hartman | 7 | 0.36% | 1 | 6.67% |
| Michał Mirosław | 5 | 0.26% | 1 | 6.67% |
| Total | 1948 | 15 |
// 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) { const struct i2c_adapter_quirks *quirks; const struct regmap_bus *bus = NULL; struct regmap_bus *ret_bus; u16 max_read = 0, max_write = 0; if (i2c_check_functionality(i2c->adapter, I2C_FUNC_I2C)) bus = ®map_i2c; else if (config->val_bits == 8 && config->reg_bits == 8 && i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) bus = ®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)) bus = ®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: bus = ®map_smbus_word; break; case REGMAP_ENDIAN_BIG: bus = ®map_smbus_word_swapped; break; 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)) bus = ®map_smbus_byte; if (!bus) return ERR_PTR(-ENOTSUPP); quirks = i2c->adapter->quirks; if (quirks) { if (quirks->max_read_len && (bus->max_raw_read == 0 || bus->max_raw_read > quirks->max_read_len)) max_read = quirks->max_read_len; if (quirks->max_write_len && (bus->max_raw_write == 0 || bus->max_raw_write > quirks->max_write_len)) max_write = quirks->max_write_len; if (max_read || max_write) { ret_bus = kmemdup(bus, sizeof(*bus), GFP_KERNEL); if (!ret_bus) return ERR_PTR(-ENOMEM); ret_bus->free_on_exit = true; ret_bus->max_raw_read = max_read; ret_bus->max_raw_write = max_write; bus = ret_bus; } } return bus; } 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");
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