diff options
Diffstat (limited to 'drivers/base/regmap/regmap-i2c.c')
| -rw-r--r-- | drivers/base/regmap/regmap-i2c.c | 142 |
1 files changed, 114 insertions, 28 deletions
diff --git a/drivers/base/regmap/regmap-i2c.c b/drivers/base/regmap/regmap-i2c.c index 4735318f4268..c9b39a02278e 100644 --- a/drivers/base/regmap/regmap-i2c.c +++ b/drivers/base/regmap/regmap-i2c.c @@ -1,14 +1,10 @@ -/* - * Register map access API - I2C support - * - * Copyright 2011 Wolfson Microelectronics plc - * - * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> - * - * 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. - */ +// 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> @@ -47,7 +43,7 @@ static int regmap_smbus_byte_reg_write(void *context, unsigned int reg, return i2c_smbus_write_byte_data(i2c, reg, val); } -static struct regmap_bus regmap_smbus_byte = { +static const struct regmap_bus regmap_smbus_byte = { .reg_write = regmap_smbus_byte_reg_write, .reg_read = regmap_smbus_byte_reg_read, }; @@ -83,7 +79,7 @@ static int regmap_smbus_word_reg_write(void *context, unsigned int reg, return i2c_smbus_write_word_data(i2c, reg, val); } -static struct regmap_bus regmap_smbus_word = { +static const struct regmap_bus regmap_smbus_word = { .reg_write = regmap_smbus_word_reg_write, .reg_read = regmap_smbus_word_reg_read, }; @@ -119,7 +115,7 @@ static int regmap_smbus_word_write_swapped(void *context, unsigned int reg, return i2c_smbus_write_word_swapped(i2c, reg, val); } -static struct regmap_bus regmap_smbus_word_swapped = { +static const struct regmap_bus regmap_smbus_word_swapped = { .reg_write = regmap_smbus_word_write_swapped, .reg_read = regmap_smbus_word_read_swapped, }; @@ -201,7 +197,7 @@ static int regmap_i2c_read(void *context, return -EIO; } -static struct regmap_bus regmap_i2c = { +static const struct regmap_bus regmap_i2c = { .write = regmap_i2c_write, .gather_write = regmap_i2c_gather_write, .read = regmap_i2c_read, @@ -217,8 +213,6 @@ static int regmap_i2c_smbus_i2c_write(void *context, const void *data, if (count < 1) return -EINVAL; - if (count >= I2C_SMBUS_BLOCK_MAX) - return -E2BIG; --count; return i2c_smbus_write_i2c_block_data(i2c, ((u8 *)data)[0], count, @@ -235,8 +229,6 @@ static int regmap_i2c_smbus_i2c_read(void *context, const void *reg, if (reg_size != 1 || val_size < 1) return -EINVAL; - if (val_size >= I2C_SMBUS_BLOCK_MAX) - return -E2BIG; ret = i2c_smbus_read_i2c_block_data(i2c, ((u8 *)reg)[0], val_size, val); if (ret == val_size) @@ -247,39 +239,132 @@ static int regmap_i2c_smbus_i2c_read(void *context, const void *reg, return -EIO; } -static struct regmap_bus regmap_i2c_smbus_i2c_block = { +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, + .max_raw_read = I2C_SMBUS_BLOCK_MAX - 1, + .max_raw_write = I2C_SMBUS_BLOCK_MAX - 1, +}; + +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 - 2, + .max_raw_write = I2C_SMBUS_BLOCK_MAX - 2, }; 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)) - return ®map_i2c; + bus = ®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; + 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: - return ®map_smbus_word; + bus = ®map_smbus_word; + break; case REGMAP_ENDIAN_BIG: - return ®map_smbus_word_swapped; + 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)) - return ®map_smbus_byte; + 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 - + (config->reg_bits + config->pad_bits) / BITS_PER_BYTE; + + 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 ERR_PTR(-ENOTSUPP); + return bus; } struct regmap *__regmap_init_i2c(struct i2c_client *i2c, @@ -312,4 +397,5 @@ struct regmap *__devm_regmap_init_i2c(struct i2c_client *i2c, } EXPORT_SYMBOL_GPL(__devm_regmap_init_i2c); +MODULE_DESCRIPTION("Register map access API - I2C support"); MODULE_LICENSE("GPL"); |