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: Bartosz Golaszewski <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>

drivers/misc/eeprom/at24.c

···
 	{ "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) },
···
 		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;
+}
+
+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;
···
 	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

···
 #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;