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misc: eeprom_93xx46: Fix 16-bit read and write accesses. 

Compatible at93xx46 devices from both Microchip and Atmel expect a
word-based address, regardless of whether the device is strapped for 8-
or 16-bit operation.  However, the offset parameter passed in when
reading or writing at a specific location is always specified in terms
of bytes.

This commit fixes 16-bit read and write accesses by shifting the offset
parameter to account for this difference between a byte offset and a
word-based address.

Signed-off-by: Cory Tusar <cory.tusar@pid1solutions.com>
Tested-by: Chris Healy <chris.healy@zii.aero>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Cory Tusar 2016-01-06 22:55:00 -05:00 committed by Greg Kroah-Hartman
parent 10a3fbf18d
commit cb54ad6cdd
1 changed files with 2 additions and 2 deletions
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4
drivers/misc/eeprom/eeprom_93xx46.c
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@ -54,7 +54,7 @@ eeprom_93xx46_bin_read(struct file *filp, struct kobject *kobj,
cmd_addr |= off & 0x7f;
bits = 10;
} else {
cmd_addr |= off & 0x3f;
cmd_addr |= (off >> 1) & 0x3f;
bits = 9;
}
@ -155,7 +155,7 @@ eeprom_93xx46_write_word(struct eeprom_93xx46_dev *edev,
bits = 10;
data_len = 1;
} else {
cmd_addr |= off & 0x3f;
cmd_addr |= (off >> 1) & 0x3f;
bits = 9;
data_len = 2;
}