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regmap-i2c: Set regmap max raw r/w from quirks

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Set regmap raw read/write from i2c quirks max read/write
so regmap_raw_read/write can split the access into chunks

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210512135222.223203-1-tanureal@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lucas Tanure 2021-05-12 14:52:22 +01:00 committed by Mark Brown
parent 6efb943b86
commit ea030ca688
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
3 changed files with 42 additions and 7 deletions
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45
drivers/base/regmap/regmap-i2c.c
View File

@ -306,33 +306,64 @@ static const struct regmap_bus regmap_i2c_smbus_i2c_block_reg16 = {
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 &regmap_i2c;
bus = &regmap_i2c;
else if (config->val_bits == 8 && config->reg_bits == 8 &&
i2c_check_functionality(i2c->adapter,
I2C_FUNC_SMBUS_I2C_BLOCK))
return &regmap_i2c_smbus_i2c_block;
bus = &regmap_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 &regmap_i2c_smbus_i2c_block_reg16;
bus = &regmap_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 &regmap_smbus_word;
bus = &regmap_smbus_word;
break;
case REGMAP_ENDIAN_BIG:
return &regmap_smbus_word_swapped;
bus = &regmap_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 &regmap_smbus_byte;
bus = &regmap_smbus_byte;
return ERR_PTR(-ENOTSUPP);
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,

2
drivers/base/regmap/regmap.c
View File

@ -1496,6 +1496,8 @@ void regmap_exit(struct regmap *map)
mutex_destroy(&map->mutex);
kfree_const(map->name);
kfree(map->patch);
if (map->bus && map->bus->free_on_exit)
kfree(map->bus);
kfree(map);
}
EXPORT_SYMBOL_GPL(regmap_exit);

2
include/linux/regmap.h
View File

@ -502,6 +502,7 @@ typedef void (*regmap_hw_free_context)(void *context);
* DEFAULT, BIG is assumed.
* @max_raw_read: Max raw read size that can be used on the bus.
* @max_raw_write: Max raw write size that can be used on the bus.
* @free_on_exit: kfree this on exit of regmap
*/
struct regmap_bus {
bool fast_io;
@ -519,6 +520,7 @@ struct regmap_bus {
enum regmap_endian val_format_endian_default;
size_t max_raw_read;
size_t max_raw_write;
bool free_on_exit;
};
/*