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eeprom: at24: remove now unneeded smbus-related code 

Remove remaining now unneeded code dealing with SMBUS details.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
This commit is contained in:
Heiner Kallweit 2017-11-28 21:51:54 +01:00 committed by Bartosz Golaszewski
parent dd69a9da71
commit a23727cb68
1 changed files with 8 additions and 48 deletions
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56
drivers/misc/eeprom/at24.c
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@ -513,8 +513,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
struct at24_platform_data chip;
kernel_ulong_t magic = 0;
bool writable;
int use_smbus = 0;
int use_smbus_write = 0;
struct at24_data *at24;
int err;
unsigned i, num_addresses;
@ -576,33 +574,10 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
if (chip.flags & AT24_FLAG_MAC && chip.byte_len == 4)
chip.byte_len = 6;
/* Use I2C operations unless we're stuck with SMBus extensions. */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
if (chip.flags & AT24_FLAG_ADDR16)
return -EPFNOSUPPORT;
if (i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
use_smbus = I2C_SMBUS_I2C_BLOCK_DATA;
} else if (i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_WORD_DATA)) {
use_smbus = I2C_SMBUS_WORD_DATA;
} else if (i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
use_smbus = I2C_SMBUS_BYTE_DATA;
} else {
return -EPFNOSUPPORT;
}
if (i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
use_smbus_write = I2C_SMBUS_I2C_BLOCK_DATA;
} else if (i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
use_smbus_write = I2C_SMBUS_BYTE_DATA;
chip.page_size = 1;
}
}
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C) &&
!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WRITE_I2C_BLOCK))
chip.page_size = 1;
if (chip.flags & AT24_FLAG_TAKE8ADDR)
num_addresses = 8;
@ -638,19 +613,10 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
writable = !(chip.flags & AT24_FLAG_READONLY);
if (writable) {
if (!use_smbus || use_smbus_write) {
unsigned write_max = chip.page_size;
if (write_max > io_limit)
write_max = io_limit;
if (use_smbus && write_max > I2C_SMBUS_BLOCK_MAX)
write_max = I2C_SMBUS_BLOCK_MAX;
at24->write_max = write_max;
} else {
dev_warn(&client->dev,
"cannot write due to controller restrictions.");
}
at24->write_max = min_t(unsigned int, chip.page_size, io_limit);
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C) &&
at24->write_max > I2C_SMBUS_BLOCK_MAX)
at24->write_max = I2C_SMBUS_BLOCK_MAX;
}
/* use dummy devices for multiple-address chips */
@ -712,12 +678,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
dev_info(&client->dev, "%u byte %s EEPROM, %s, %u bytes/write\n",
chip.byte_len, client->name,
writable ? "writable" : "read-only", at24->write_max);
if (use_smbus == I2C_SMBUS_WORD_DATA ||
use_smbus == I2C_SMBUS_BYTE_DATA) {
dev_notice(&client->dev, "Falling back to %s reads, "
"performance will suffer\n", use_smbus ==
I2C_SMBUS_WORD_DATA ? "word" : "byte");
}
/* export data to kernel code */
if (chip.setup)