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Date: Sat, 19 Oct 2019 22:40:15 +0200
From: Angelo Dureghello <angelo.dureghello@...esys.com>
To: zbr@...emap.net, gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org,
Angelo Dureghello <angelo.dureghello@...esys.com>
Subject: [PATCH v2] w1: new driver. DS2430 chip
add support for ds2430, 1 page, 256bit (32bytes) eeprom
(family 0x14).
Tests done:
32 bytes dump:
x@y:~# hexdump -C -n 32 /sys/bus/w1/devices/14-00000158556e/eeprom
00000000 39 39 0a 00 00 36 0a ff ff ff ff ff ff ff ff ff
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
00000020
34 bytes dump: 32 only displayed
x@y:~# hexdump -C -n 34 /sys/bus/w1/devices/14-00000158556e/eeprom
00000000 39 39 0a 00 00 36 0a ff ff ff ff ff ff ff ff ff
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
00000020
pattern write:
x@y:~# echo 123456789 > /sys/bus/w1/devices/14-00000158556e/eeprom
x@y:~# hexdump -C -n 54 /sys/bus/w1/devices/14-00000158556e/eeprom
00000000 31 32 33 34 35 36 37 38 39 0a ff ff ff ff ff ff
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
00000020
specific address 1-byte write
x@y:~# dd if=/dev/zero of=/sys/bus/w1/devices/14-00000158556e/eeprom \
count=1 bs=1 seek=4
1+0 records in
1+0 records out
x@y:~# hexdump -C -n 54 /sys/bus/w1/devices/14-00000158556e/eeprom
00000000 31 32 33 34 00 36 37 38 39 0a ff ff ff ff ff ff
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
00000020
writing binary block
x@y:~# cat dump-128bytes.bin > /sys/bus/w1/devices/14-00000158556e/eeprom
cat: write error: File too large
x@y:~# cat dump-32bytes.bin > /sys/bus/w1/devices/14-00000158556e/eeprom
x@y:~# hexdump -C -n 54 /sys/bus/w1/devices/14-00000158556e/eeprom
00000000 10 0b 5b ff ff ff ff ff ff ff ff ff ff ff ff ff
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 40
00000020
Signed-off-by: Angelo Dureghello <angelo.dureghello@...esys.com>
---
drivers/w1/slaves/Kconfig | 8 +
drivers/w1/slaves/Makefile | 1 +
drivers/w1/slaves/w1_ds2430.c | 295 ++++++++++++++++++++++++++++++++++
3 files changed, 304 insertions(+)
create mode 100644 drivers/w1/slaves/w1_ds2430.c
diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig
index b7847636501d..687753889c34 100644
--- a/drivers/w1/slaves/Kconfig
+++ b/drivers/w1/slaves/Kconfig
@@ -74,6 +74,14 @@ config W1_SLAVE_DS2805
organized as 7 pages of 16 bytes each with 64bit
unique number. Requires OverDrive Speed to talk to.
+config W1_SLAVE_DS2430
+ tristate "256b EEPROM family support (DS2430)"
+ help
+ Say Y here if you want to use a 1-wire 256bit EEPROM
+ family device (DS2430).
+ This EEPROM is organized as one page of 32 bytes for random
+ access.
+
config W1_SLAVE_DS2431
tristate "1kb EEPROM family support (DS2431)"
help
diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile
index 8e9655eaa478..278bcf2a9bfd 100644
--- a/drivers/w1/slaves/Makefile
+++ b/drivers/w1/slaves/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_W1_SLAVE_DS2408) += w1_ds2408.o
obj-$(CONFIG_W1_SLAVE_DS2413) += w1_ds2413.o
obj-$(CONFIG_W1_SLAVE_DS2406) += w1_ds2406.o
obj-$(CONFIG_W1_SLAVE_DS2423) += w1_ds2423.o
+obj-$(CONFIG_W1_SLAVE_DS2430) += w1_ds2430.o
obj-$(CONFIG_W1_SLAVE_DS2431) += w1_ds2431.o
obj-$(CONFIG_W1_SLAVE_DS2805) += w1_ds2805.o
obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o
diff --git a/drivers/w1/slaves/w1_ds2430.c b/drivers/w1/slaves/w1_ds2430.c
new file mode 100644
index 000000000000..6fb0563fb2ae
--- /dev/null
+++ b/drivers/w1/slaves/w1_ds2430.c
@@ -0,0 +1,295 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * w1_ds2430.c - w1 family 14 (DS2430) driver
+ **
+ * Copyright (c) 2019 Angelo Dureghello <angelo.dureghello@...esys.com>
+ *
+ * Cloned and modified from ds2431
+ * Copyright (c) 2008 Bernhard Weirich <bernhard.weirich@...del.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@...esys.com>");
+MODULE_DESCRIPTION("w1 family 14 driver for DS2430, 256kb EEPROM");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2430));
--
2.23.0
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