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// SPDX-License-Identifier: GPL-2.0-only
/*
* w1_ds2430.c - w1 family 14 (DS2430) driver
**
* Copyright (c) 2019 Angelo Dureghello <angelo.dureghello@timesys.com>
*
* Cloned and modified from ds2431
* Copyright (c) 2008 Bernhard Weirich <bernhard.weirich@riedel.net>
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/w1.h>
#define W1_EEPROM_DS2430 0x14
#define W1_F14_EEPROM_SIZE 32
#define W1_F14_PAGE_COUNT 1
#define W1_F14_PAGE_BITS 5
#define W1_F14_PAGE_SIZE (1 << W1_F14_PAGE_BITS)
#define W1_F14_PAGE_MASK 0x1F
#define W1_F14_SCRATCH_BITS 5
#define W1_F14_SCRATCH_SIZE (1 << W1_F14_SCRATCH_BITS)
#define W1_F14_SCRATCH_MASK (W1_F14_SCRATCH_SIZE-1)
#define W1_F14_READ_EEPROM 0xF0
#define W1_F14_WRITE_SCRATCH 0x0F
#define W1_F14_READ_SCRATCH 0xAA
#define W1_F14_COPY_SCRATCH 0x55
#define W1_F14_VALIDATION_KEY 0xa5
#define W1_F14_TPROG_MS 11
#define W1_F14_READ_RETRIES 10
#define W1_F14_READ_MAXLEN W1_F14_SCRATCH_SIZE
/*
* Check the file size bounds and adjusts count as needed.
* This would not be needed if the file size didn't reset to 0 after a write.
*/
static inline size_t w1_f14_fix_count(loff_t off, size_t count, size_t size)
{
if (off > size)
return 0;
if ((off + count) > size)
return size - off;
return count;
}
/*
* Read a block from W1 ROM two times and compares the results.
* If they are equal they are returned, otherwise the read
* is repeated W1_F14_READ_RETRIES times.
*
* count must not exceed W1_F14_READ_MAXLEN.
*/
static int w1_f14_readblock(struct w1_slave *sl, int off, int count, char *buf)
{
u8 wrbuf[2];
u8 cmp[W1_F14_READ_MAXLEN];
int tries = W1_F14_READ_RETRIES;
do {
wrbuf[0] = W1_F14_READ_EEPROM;
wrbuf[1] = off & 0xff;
if (w1_reset_select_slave(sl))
return -1;
w1_write_block(sl->master, wrbuf, 2);
w1_read_block(sl->master, buf, count);
if (w1_reset_select_slave(sl))
return -1;
w1_write_block(sl->master, wrbuf, 2);
w1_read_block(sl->master, cmp, count);
if (!memcmp(cmp, buf, count))
return 0;
} while (--tries);
dev_err(&sl->dev, "proof reading failed %d times\n",
W1_F14_READ_RETRIES);
return -1;
}
static ssize_t eeprom_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
struct w1_slave *sl = kobj_to_w1_slave(kobj);
int todo = count;
count = w1_f14_fix_count(off, count, W1_F14_EEPROM_SIZE);
if (count == 0)
return 0;
mutex_lock(&sl->master->bus_mutex);
/* read directly from the EEPROM in chunks of W1_F14_READ_MAXLEN */
while (todo > 0) {
int block_read;
if (todo >= W1_F14_READ_MAXLEN)
block_read = W1_F14_READ_MAXLEN;
else
block_read = todo;
if (w1_f14_readblock(sl, off, block_read, buf) < 0)
count = -EIO;
todo -= W1_F14_READ_MAXLEN;
buf += W1_F14_READ_MAXLEN;
off += W1_F14_READ_MAXLEN;
}
mutex_unlock(&sl->master->bus_mutex);
return count;
}
/*
* Writes to the scratchpad and reads it back for verification.
* Then copies the scratchpad to EEPROM.
* The data must be aligned at W1_F14_SCRATCH_SIZE bytes and
* must be W1_F14_SCRATCH_SIZE bytes long.
* The master must be locked.
*
* @param sl The slave structure
* @param addr Address for the write
* @param len length must be <= (W1_F14_PAGE_SIZE - (addr & W1_F14_PAGE_MASK))
* @param data The data to write
* @return 0=Success -1=failure
*/
static int w1_f14_write(struct w1_slave *sl, int addr, int len, const u8 *data)
{
int tries = W1_F14_READ_RETRIES;
u8 wrbuf[2];
u8 rdbuf[W1_F14_SCRATCH_SIZE + 3];
retry:
/* Write the data to the scratchpad */
if (w1_reset_select_slave(sl))
return -1;
wrbuf[0] = W1_F14_WRITE_SCRATCH;
wrbuf[1] = addr & 0xff;
w1_write_block(sl->master, wrbuf, 2);
w1_write_block(sl->master, data, len);
/* Read the scratchpad and verify */
if (w1_reset_select_slave(sl))
return -1;
w1_write_8(sl->master, W1_F14_READ_SCRATCH);
w1_read_block(sl->master, rdbuf, len + 2);
/*
* Compare what was read against the data written
* Note: on read scratchpad, device returns 2 bulk 0xff bytes,
* to be discarded.
*/
if ((memcmp(data, &rdbuf[2], len) != 0)) {
if (--tries)
goto retry;
dev_err(&sl->dev,
"could not write to eeprom, scratchpad compare failed %d times\n",
W1_F14_READ_RETRIES);
return -1;
}
/* Copy the scratchpad to EEPROM */
if (w1_reset_select_slave(sl))
return -1;
wrbuf[0] = W1_F14_COPY_SCRATCH;
wrbuf[1] = W1_F14_VALIDATION_KEY;
w1_write_block(sl->master, wrbuf, 2);
/* Sleep for tprog ms to wait for the write to complete */
msleep(W1_F14_TPROG_MS);
/* Reset the bus to wake up the EEPROM */
w1_reset_bus(sl->master);
return 0;
}
static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
struct w1_slave *sl = kobj_to_w1_slave(kobj);
int addr, len;
int copy;
count = w1_f14_fix_count(off, count, W1_F14_EEPROM_SIZE);
if (count == 0)
return 0;
mutex_lock(&sl->master->bus_mutex);
/* Can only write data in blocks of the size of the scratchpad */
addr = off;
len = count;
while (len > 0) {
/* if len too short or addr not aligned */
if (len < W1_F14_SCRATCH_SIZE || addr & W1_F14_SCRATCH_MASK) {
char tmp[W1_F14_SCRATCH_SIZE];
/* read the block and update the parts to be written */
if (w1_f14_readblock(sl, addr & ~W1_F14_SCRATCH_MASK,
W1_F14_SCRATCH_SIZE, tmp)) {
count = -EIO;
goto out_up;
}
/* copy at most to the boundary of the PAGE or len */
copy = W1_F14_SCRATCH_SIZE -
(addr & W1_F14_SCRATCH_MASK);
if (copy > len)
copy = len;
memcpy(&tmp[addr & W1_F14_SCRATCH_MASK], buf, copy);
if (w1_f14_write(sl, addr & ~W1_F14_SCRATCH_MASK,
W1_F14_SCRATCH_SIZE, tmp) < 0) {
count = -EIO;
goto out_up;
}
} else {
copy = W1_F14_SCRATCH_SIZE;
if (w1_f14_write(sl, addr, copy, buf) < 0) {
count = -EIO;
goto out_up;
}
}
buf += copy;
addr += copy;
len -= copy;
}
out_up:
mutex_unlock(&sl->master->bus_mutex);
return count;
}
static BIN_ATTR_RW(eeprom, W1_F14_EEPROM_SIZE);
static struct bin_attribute *w1_f14_bin_attrs[] = {
&bin_attr_eeprom,
NULL,
};
static const struct attribute_group w1_f14_group = {
.bin_attrs = w1_f14_bin_attrs,
};
static const struct attribute_group *w1_f14_groups[] = {
&w1_f14_group,
NULL,
};
static struct w1_family_ops w1_f14_fops = {
.groups = w1_f14_groups,
};
static struct w1_family w1_family_14 = {
.fid = W1_EEPROM_DS2430,
.fops = &w1_f14_fops,
};
module_w1_family(w1_family_14);
MODULE_AUTHOR("Angelo Dureghello <angelo.dureghello@timesys.com>");
MODULE_DESCRIPTION("w1 family 14 driver for DS2430, 256b EEPROM");
MODULE_LICENSE("GPL");
MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2430));
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