Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-12-28 16:56:26 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

w1: ds2433: add support for ds28ec20 eeprom

Browse Source 
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>
This commit is contained in:
Marc Ferland 2023-12-18 10:02:30 -05:00 committed by Krzysztof Kozlowski
parent 3fe3a1bfef
commit 93c4bb3666
1 changed files with 92 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

101
drivers/w1/slaves/w1_ds2433.c
View File

@ -1,8 +1,9 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* w1_ds2433.c - w1 family 23 (DS2433) driver
* w1_ds2433.c - w1 family 23 (DS2433) & 43 (DS28EC20) eeprom driver
*
* Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
* Copyright (c) 2023 Marc Ferland <marc.ferland@sonatest.com>
*/
#include <linux/kernel.h>
@ -23,12 +24,15 @@
#include <linux/w1.h>
#define W1_EEPROM_DS2433 0x23
#define W1_EEPROM_DS28EC20 0x43
#define W1_EEPROM_DS2433_SIZE 512
#define W1_EEPROM_DS28EC20_SIZE 2560
#define W1_EEPROM_SIZE 512
#define W1_PAGE_SIZE 32
#define W1_PAGE_BITS 5
#define W1_PAGE_MASK 0x1F
#define W1_VALIDCRC_MAX 32
#define W1_VALIDCRC_MAX 96
#define W1_F23_READ_EEPROM 0xF0
#define W1_F23_WRITE_SCRATCH 0x0F
@ -42,11 +46,17 @@ struct ds2433_config {
};
static const struct ds2433_config config_f23 = {
.eeprom_size = W1_EEPROM_SIZE,
.eeprom_size = W1_EEPROM_DS2433_SIZE,
.page_count = 16,
.tprog = 5,
};
static const struct ds2433_config config_f43 = {
.eeprom_size = W1_EEPROM_DS28EC20_SIZE,
.page_count = 80,
.tprog = 10,
};
struct w1_f23_data {
#ifdef CONFIG_W1_SLAVE_DS2433_CRC
u8 *memory;
@ -264,10 +274,22 @@ static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
return count;
}
static BIN_ATTR_RW(eeprom, W1_EEPROM_SIZE);
static struct bin_attribute bin_attr_f23_eeprom = {
.attr = { .name = "eeprom", .mode = 0644 },
.read = eeprom_read,
.write = eeprom_write,
.size = W1_EEPROM_DS2433_SIZE,
};
static struct bin_attribute bin_attr_f43_eeprom = {
.attr = { .name = "eeprom", .mode = 0644 },
.read = eeprom_read,
.write = eeprom_write,
.size = W1_EEPROM_DS28EC20_SIZE,
};
static struct bin_attribute *w1_f23_bin_attributes[] = {
&bin_attr_eeprom,
&bin_attr_f23_eeprom,
NULL,
};
@ -280,6 +302,20 @@ static const struct attribute_group *w1_f23_groups[] = {
NULL,
};
static struct bin_attribute *w1_f43_bin_attributes[] = {
&bin_attr_f43_eeprom,
NULL,
};
static const struct attribute_group w1_f43_group = {
.bin_attrs = w1_f43_bin_attributes,
};
static const struct attribute_group *w1_f43_groups[] = {
&w1_f43_group,
NULL,
};
static int w1_f23_add_slave(struct w1_slave *sl)
{
struct w1_f23_data *data;
@ -288,7 +324,14 @@ static int w1_f23_add_slave(struct w1_slave *sl)
if (!data)
return -ENOMEM;
data->cfg = &config_f23;
switch (sl->family->fid) {
case W1_EEPROM_DS2433:
data->cfg = &config_f23;
break;
case W1_EEPROM_DS28EC20:
data->cfg = &config_f43;
break;
}
#ifdef CONFIG_W1_SLAVE_DS2433_CRC
if (data->cfg->page_count > W1_VALIDCRC_MAX) {
@ -324,13 +367,53 @@ static const struct w1_family_ops w1_f23_fops = {
.groups = w1_f23_groups,
};
static const struct w1_family_ops w1_f43_fops = {
.add_slave = w1_f23_add_slave,
.remove_slave = w1_f23_remove_slave,
.groups = w1_f43_groups,
};
static struct w1_family w1_family_23 = {
.fid = W1_EEPROM_DS2433,
.fops = &w1_f23_fops,
};
module_w1_family(w1_family_23);
static struct w1_family w1_family_43 = {
.fid = W1_EEPROM_DS28EC20,
.fops = &w1_f43_fops,
};
static int __init w1_ds2433_init(void)
{
int err;
err = w1_register_family(&w1_family_23);
if (err)
return err;
err = w1_register_family(&w1_family_43);
if (err)
goto err_43;
return 0;
err_43:
w1_unregister_family(&w1_family_23);
return err;
}
static void __exit w1_ds2433_exit(void)
{
w1_unregister_family(&w1_family_23);
w1_unregister_family(&w1_family_43);
}
module_init(w1_ds2433_init);
module_exit(w1_ds2433_exit);
MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
MODULE_DESCRIPTION("w1 family 23 driver for DS2433, 4kb EEPROM");
MODULE_AUTHOR("Marc Ferland <marc.ferland@sonatest.com>");
MODULE_DESCRIPTION("w1 family 23/43 driver for DS2433 (4kb) and DS28EC20 (20kb)");
MODULE_LICENSE("GPL");
MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2433));
MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS28EC20));