Commit 0b813658 authored by Bartosz Golaszewski's avatar Bartosz Golaszewski Committed by Wolfram Sang
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eeprom: at24: add support for at24mac series 



Add a new read function to the at24 driver allowing to retrieve the
factory-programmed mac address embedded in chips from the at24mac
family.

These chips can be instantiated similarily to the at24cs family,
except that there's no way of having access to both the serial number
and the mac address at the same time - the user must instantiate
either an at24cs or at24mac device as both special memory areas are
accessible on the same slave address.

Signed-off-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 818d0220

drivers/misc/eeprom/at24.c

+42 −0
Original line number Diff line number Diff line
@@ -139,6 +139,10 @@ static const struct i2c_device_id at24_ids[] = { 
	{ "24c02",	AT24_DEVICE_MAGIC(2048 / 8,	0) },

	{ "24cs02",	AT24_DEVICE_MAGIC(16,

				AT24_FLAG_SERIAL | AT24_FLAG_READONLY) },

	{ "24mac402",	AT24_DEVICE_MAGIC(48 / 8,

				AT24_FLAG_MAC | AT24_FLAG_READONLY) },

	{ "24mac602",	AT24_DEVICE_MAGIC(64 / 8,

				AT24_FLAG_MAC | AT24_FLAG_READONLY) },

	/* spd is a 24c02 in memory DIMMs */

	{ "spd",	AT24_DEVICE_MAGIC(2048 / 8,

				AT24_FLAG_READONLY | AT24_FLAG_IRUGO) },
@@ -347,6 +351,36 @@ static ssize_t at24_eeprom_read_serial(struct at24_data *at24, char *buf, 
	return -ETIMEDOUT;

}



static ssize_t at24_eeprom_read_mac(struct at24_data *at24, char *buf,

				    unsigned int offset, size_t count)

{

	unsigned long timeout, read_time;

	struct i2c_client *client;

	struct i2c_msg msg[2];

	u8 addrbuf[2];

	int status;



	client = at24_translate_offset(at24, &offset);



	memset(msg, 0, sizeof(msg));

	msg[0].addr = client->addr;

	msg[0].buf = addrbuf;

	addrbuf[0] = 0x90 + offset;

	msg[0].len = 1;

	msg[1].addr = client->addr;

	msg[1].flags = I2C_M_RD;

	msg[1].buf = buf;

	msg[1].len = count;



	loop_until_timeout(timeout, read_time) {

		status = i2c_transfer(client->adapter, msg, 2);

		if (status == 2)

			return count;

	}



	return -ETIMEDOUT;

}



/*

 * Note that if the hardware write-protect pin is pulled high, the whole

 * chip is normally write protected. But there are plenty of product
@@ -648,8 +682,16 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) 
	at24->chip = chip;

	at24->num_addresses = num_addresses;



	if ((chip.flags & AT24_FLAG_SERIAL) && (chip.flags & AT24_FLAG_MAC)) {

		dev_err(&client->dev,

			"invalid device data - cannot have both AT24_FLAG_SERIAL & AT24_FLAG_MAC.");

		return -EINVAL;

	}



	if (chip.flags & AT24_FLAG_SERIAL) {

		at24->read_func = at24_eeprom_read_serial;

	} else if (chip.flags & AT24_FLAG_MAC) {

		at24->read_func = at24_eeprom_read_mac;

	} else {

		at24->read_func = at24->use_smbus ? at24_eeprom_read_smbus

						  : at24_eeprom_read_i2c;

include/linux/platform_data/at24.h

+1 −0
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ struct at24_platform_data { 
#define AT24_FLAG_IRUGO		BIT(5)	/* sysfs-entry will be world-readable */

#define AT24_FLAG_TAKE8ADDR	BIT(4)	/* take always 8 addresses (24c00) */

#define AT24_FLAG_SERIAL	BIT(3)	/* factory-programmed serial number */

#define AT24_FLAG_MAC		BIT(2)	/* factory-programmed mac address */



	void		(*setup)(struct nvmem_device *nvmem, void *context);

	void		*context;

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