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Commit a23727cb authored by Heiner Kallweit's avatar Heiner Kallweit Committed by Bartosz Golaszewski
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eeprom: at24: remove now unneeded smbus-related code 



Remove remaining now unneeded code dealing with SMBUS details.

Signed-off-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: default avatarBartosz Golaszewski <brgl@bgdev.pl>
parent dd69a9da

drivers/misc/eeprom/at24.c

+8 −48
Original line number Diff line number Diff line
@@ -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;

	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)