diff options
| author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2016-06-06 10:48:51 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2016-07-17 19:57:30 +0200 |
| commit | 818d0220d857cc92cb37600758c5b47c3df3782b (patch) | |
| tree | dea3c7a564d3ee9c181d1f867414965a7d29025c /include/linux/platform_data | |
| parent | a7284a82e826b88eb6264747cee57888d4076c48 (diff) | |
| download | linux-818d0220d857cc92cb37600758c5b47c3df3782b.tar.gz | |
eeprom: at24: support reading the serial number for 24csxx
The chips from the at24cs family have two memory areas - a regular
read-write block and a read-only area containing the serial number.
The latter is visible on a different slave address (the address of the
rw memory block + 0x08). In order to access both blocks the user needs
to instantiate a regular at24c device for the rw block address and a
corresponding at24cs device on the serial number block address.
Add a function that allows to access the serial number and assign it
to at24->read_func if the chip allows serial number read operations
and the driver was passed the relevant flag for this device.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'include/linux/platform_data')
| -rw-r--r-- | include/linux/platform_data/at24.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/platform_data/at24.h b/include/linux/platform_data/at24.h index fcfdfe3c0e9c..d59587473aed 100644 --- a/include/linux/platform_data/at24.h +++ b/include/linux/platform_data/at24.h @@ -48,6 +48,7 @@ struct at24_platform_data { #define AT24_FLAG_READONLY BIT(6) /* sysfs-entry will be read-only */ #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 */ void (*setup)(struct nvmem_device *nvmem, void *context); void *context; |