linux/drivers/w1/slaves
Marc Ferland 93c4bb3666 w1: ds2433: add support for ds28ec20 eeprom
The ds28ec20 eeprom is (almost) backward compatible with the
ds2433. The only differences are:

- the eeprom size is now 2560 bytes instead of 512;
- the number of pages is now 80 (same page size as the ds2433: 256 bits);
- the programming time has increased from 5ms to 10ms;

This patch adds support for the ds28ec20 to the ds2433 driver. From
the datasheet: The DS28EC20 provides a high degree of backward
compatibility with the DS2433. Besides the different family codes, the
only protocol change that is required on an existing DS2433
implementation is a lengthening of the programming duration (tPROG)
from 5ms to 10ms.

dmesg now returns:

    w1_master_driver w1_bus_master1: Attaching one wire slave 43.000000478756 crc e0

instead of:

    w1_master_driver w1_bus_master1: Attaching one wire slave 43.000000478756 crc e0
    w1_master_driver w1_bus_master1: Family 43 for 43.000000478756.e0 is not registered.

Test script writing/reading random data (CONFIG_W1_SLAVE_DS2433_CRC is
not set):

    #!/bin/sh

    EEPROM=/sys/bus/w1/devices/43-000000478756/eeprom
    BINFILE1=/home/root/file1.bin
    BINFILE2=/home/root/file2.bin

    for BS in 1 2 3 4 8 16 32 64 128 256 512 1024 2560; do
        dd if=/dev/random of=${BINFILE1} bs=${BS} count=1 status=none
        dd if=${BINFILE1} of=${EEPROM} status=none
        dd if=${EEPROM} of=${BINFILE2} bs=${BS} count=1 status=none
        if ! cmp --silent ${BINFILE1} ${BINFILE2}; then
    	    echo file1
    	    hexdump ${BINFILE1}
    	    echo file2
    	    hexdump ${BINFILE2}
    	    echo FAIL
    	    exit 1
        fi
        echo "${BS} OK!"
    done

Results:

    # ./test.sh
    1 OK!
    2 OK!
    3 OK!
    4 OK!
    8 OK!
    16 OK!
    32 OK!
    64 OK!
    128 OK!
    256 OK!
    512 OK!
    1024 OK!
    2560 OK!

Tests with CONFIG_W1_SLAVE_DS2433_CRC=y:

    $ cat /proc/config.gz | gunzip | grep CONFIG_W1_SLAVE_DS2433
    CONFIG_W1_SLAVE_DS2433=m
    CONFIG_W1_SLAVE_DS2433_CRC=y

    # create a 32 bytes block with a crc, i.e.:
    00000000  31 32 33 34 35 36 37 38  39 3a 3b 3c 3d 3e 3f 40  |123456789:;<=>?@|
    00000010  41 42 43 44 45 46 47 48  49 4a 4b 4c 4d 4e ba 63  |ABCDEFGHIJKLMN.c|

    # fill all 80 blocks
    $ dd if=test.bin of=/sys/bus/w1/devices/43-000000478756/eeprom bs=32 count=80

    # read back all blocks, i.e.:
    $ hexdump -C /sys/bus/w1/devices/43-000000478756/eeprom
    00000000  31 32 33 34 35 36 37 38  39 3a 3b 3c 3d 3e 3f 40  |123456789:;<=>?@|
    00000010  41 42 43 44 45 46 47 48  49 4a 4b 4c 4d 4e ba 63  |ABCDEFGHIJKLMN.c|
    00000020  31 32 33 34 35 36 37 38  39 3a 3b 3c 3d 3e 3f 40  |123456789:;<=>?@|
    00000030  41 42 43 44 45 46 47 48  49 4a 4b 4c 4d 4e ba 63  |ABCDEFGHIJKLMN.c|
    ...
    000009e0  31 32 33 34 35 36 37 38  39 3a 3b 3c 3d 3e 3f 40  |123456789:;<=>?@|
    000009f0  41 42 43 44 45 46 47 48  49 4a 4b 4c 4d 4e ba 63  |ABCDEFGHIJKLMN.c|
    00000a00

Note: both memories (ds2433 and ds28ec20) have been tested with the
new driver.

Signed-off-by: Marc Ferland <marc.ferland@sonatest.com>
Co-developed-by: Jean-Francois Dagenais <jeff.dagenais@gmail.com>
Signed-off-by: Jean-Francois Dagenais <jeff.dagenais@gmail.com>
Link: https://lore.kernel.org/r/20231218150230.1992448-6-marc.ferland@sonatest.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
2023-12-20 09:25:25 +01:00
..
Kconfig w1: Fix Kconfig indentation 2023-05-08 08:14:50 +02:00
Makefile w1: new driver. DS2430 chip 2019-11-14 13:06:33 +08:00
w1_ds28e04.c w1: minor white-space and code style fixes 2023-04-20 14:15:06 +02:00
w1_ds28e17.c w1: use octal for file permissions 2023-04-20 14:15:06 +02:00
w1_ds250x.c nvmem: add explicit config option to read old syntax fixed OF cells 2023-10-21 19:19:06 +02:00
w1_ds2405.c w1: Constify static w1_family_ops structs 2020-10-05 13:21:49 +02:00
w1_ds2406.c w1: use octal for file permissions 2023-04-20 14:15:06 +02:00
w1_ds2408.c w1: minor white-space and code style fixes 2023-04-20 14:15:06 +02:00
w1_ds2413.c w1: use octal for file permissions 2023-04-20 14:15:06 +02:00
w1_ds2423.c w1: Constify static w1_family_ops structs 2020-10-05 13:21:49 +02:00
w1_ds2430.c w1: Constify static w1_family_ops structs 2020-10-05 13:21:49 +02:00
w1_ds2431.c w1: Constify static w1_family_ops structs 2020-10-05 13:21:49 +02:00
w1_ds2433.c w1: ds2433: add support for ds28ec20 eeprom 2023-12-20 09:25:25 +01:00
w1_ds2438.c w1: ds2438: remove redundant initialization of variable crc 2023-05-08 08:14:51 +02:00
w1_ds2780.c w1: minor white-space and code style fixes 2023-04-20 14:15:06 +02:00
w1_ds2780.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
w1_ds2781.c w1: minor white-space and code style fixes 2023-04-20 14:15:06 +02:00
w1_ds2781.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
w1_ds2805.c w1: use octal for file permissions 2023-04-20 14:15:06 +02:00
w1_smem.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 94 2019-05-24 17:37:53 +02:00
w1_therm.c w1: therm: constify pointers to hwmon_channel_info 2023-05-08 12:16:38 +02:00