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-rw-r--r--drivers/w1/slaves/w1_ds2431.c312
-rw-r--r--drivers/w1/slaves/w1_ds2760.c1
-rw-r--r--drivers/w1/slaves/w1_therm.c72
3 files changed, 346 insertions, 39 deletions
diff --git a/drivers/w1/slaves/w1_ds2431.c b/drivers/w1/slaves/w1_ds2431.c
new file mode 100644
index 000000000000..2c6c0cf6a20f
--- /dev/null
+++ b/drivers/w1/slaves/w1_ds2431.c
@@ -0,0 +1,312 @@
+/*
+ * w1_ds2431.c - w1 family 2d (DS2431) driver
+ *
+ * Copyright (c) 2008 Bernhard Weirich <bernhard.weirich@riedel.net>
+ *
+ * Heavily inspired by w1_DS2433 driver from Ben Gardner <bgardner@wabtec.com>
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#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 "../w1.h"
+#include "../w1_int.h"
+#include "../w1_family.h"
+
+#define W1_F2D_EEPROM_SIZE 128
+#define W1_F2D_PAGE_COUNT 4
+#define W1_F2D_PAGE_BITS 5
+#define W1_F2D_PAGE_SIZE (1<<W1_F2D_PAGE_BITS)
+#define W1_F2D_PAGE_MASK 0x1F
+
+#define W1_F2D_SCRATCH_BITS 3
+#define W1_F2D_SCRATCH_SIZE (1<<W1_F2D_SCRATCH_BITS)
+#define W1_F2D_SCRATCH_MASK (W1_F2D_SCRATCH_SIZE-1)
+
+#define W1_F2D_READ_EEPROM 0xF0
+#define W1_F2D_WRITE_SCRATCH 0x0F
+#define W1_F2D_READ_SCRATCH 0xAA
+#define W1_F2D_COPY_SCRATCH 0x55
+
+
+#define W1_F2D_TPROG_MS 11
+
+#define W1_F2D_READ_RETRIES 10
+#define W1_F2D_READ_MAXLEN 8
+
+/*
+ * 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_f2d_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_F2D_READ_RETRIES times.
+ *
+ * count must not exceed W1_F2D_READ_MAXLEN.
+ */
+static int w1_f2d_readblock(struct w1_slave *sl, int off, int count, char *buf)
+{
+ u8 wrbuf[3];
+ u8 cmp[W1_F2D_READ_MAXLEN];
+ int tries = W1_F2D_READ_RETRIES;
+
+ do {
+ wrbuf[0] = W1_F2D_READ_EEPROM;
+ wrbuf[1] = off & 0xff;
+ wrbuf[2] = off >> 8;
+
+ if (w1_reset_select_slave(sl))
+ return -1;
+
+ w1_write_block(sl->master, wrbuf, 3);
+ w1_read_block(sl->master, buf, count);
+
+ if (w1_reset_select_slave(sl))
+ return -1;
+
+ w1_write_block(sl->master, wrbuf, 3);
+ 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_F2D_READ_RETRIES);
+
+ return -1;
+}
+
+static ssize_t w1_f2d_read_bin(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_f2d_fix_count(off, count, W1_F2D_EEPROM_SIZE);
+ if (count == 0)
+ return 0;
+
+ mutex_lock(&sl->master->mutex);
+
+ /* read directly from the EEPROM in chunks of W1_F2D_READ_MAXLEN */
+ while (todo > 0) {
+ int block_read;
+
+ if (todo >= W1_F2D_READ_MAXLEN)
+ block_read = W1_F2D_READ_MAXLEN;
+ else
+ block_read = todo;
+
+ if (w1_f2d_readblock(sl, off, block_read, buf) < 0)
+ count = -EIO;
+
+ todo -= W1_F2D_READ_MAXLEN;
+ buf += W1_F2D_READ_MAXLEN;
+ off += W1_F2D_READ_MAXLEN;
+ }
+
+ mutex_unlock(&sl->master->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_F2D_SCRATCH_SIZE bytes and
+ * must be W1_F2D_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_F2D_PAGE_SIZE - (addr & W1_F2D_PAGE_MASK))
+ * @param data The data to write
+ * @return 0=Success -1=failure
+ */
+static int w1_f2d_write(struct w1_slave *sl, int addr, int len, const u8 *data)
+{
+ int tries = W1_F2D_READ_RETRIES;
+ u8 wrbuf[4];
+ u8 rdbuf[W1_F2D_SCRATCH_SIZE + 3];
+ u8 es = (addr + len - 1) % W1_F2D_SCRATCH_SIZE;
+
+retry:
+
+ /* Write the data to the scratchpad */
+ if (w1_reset_select_slave(sl))
+ return -1;
+
+ wrbuf[0] = W1_F2D_WRITE_SCRATCH;
+ wrbuf[1] = addr & 0xff;
+ wrbuf[2] = addr >> 8;
+
+ w1_write_block(sl->master, wrbuf, 3);
+ 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_F2D_READ_SCRATCH);
+ w1_read_block(sl->master, rdbuf, len + 3);
+
+ /* Compare what was read against the data written */
+ if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) ||
+ (rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0)) {
+
+ if (--tries)
+ goto retry;
+
+ dev_err(&sl->dev,
+ "could not write to eeprom, scratchpad compare failed %d times\n",
+ W1_F2D_READ_RETRIES);
+
+ return -1;
+ }
+
+ /* Copy the scratchpad to EEPROM */
+ if (w1_reset_select_slave(sl))
+ return -1;
+
+ wrbuf[0] = W1_F2D_COPY_SCRATCH;
+ wrbuf[3] = es;
+ w1_write_block(sl->master, wrbuf, 4);
+
+ /* Sleep for tprog ms to wait for the write to complete */
+ msleep(W1_F2D_TPROG_MS);
+
+ /* Reset the bus to wake up the EEPROM */
+ w1_reset_bus(sl->master);
+
+ return 0;
+}
+
+static ssize_t w1_f2d_write_bin(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_f2d_fix_count(off, count, W1_F2D_EEPROM_SIZE);
+ if (count == 0)
+ return 0;
+
+ mutex_lock(&sl->master->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_F2D_SCRATCH_SIZE || addr & W1_F2D_SCRATCH_MASK) {
+ char tmp[W1_F2D_SCRATCH_SIZE];
+
+ /* read the block and update the parts to be written */
+ if (w1_f2d_readblock(sl, addr & ~W1_F2D_SCRATCH_MASK,
+ W1_F2D_SCRATCH_SIZE, tmp)) {
+ count = -EIO;
+ goto out_up;
+ }
+
+ /* copy at most to the boundary of the PAGE or len */
+ copy = W1_F2D_SCRATCH_SIZE -
+ (addr & W1_F2D_SCRATCH_MASK);
+
+ if (copy > len)
+ copy = len;
+
+ memcpy(&tmp[addr & W1_F2D_SCRATCH_MASK], buf, copy);
+ if (w1_f2d_write(sl, addr & ~W1_F2D_SCRATCH_MASK,
+ W1_F2D_SCRATCH_SIZE, tmp) < 0) {
+ count = -EIO;
+ goto out_up;
+ }
+ } else {
+
+ copy = W1_F2D_SCRATCH_SIZE;
+ if (w1_f2d_write(sl, addr, copy, buf) < 0) {
+ count = -EIO;
+ goto out_up;
+ }
+ }
+ buf += copy;
+ addr += copy;
+ len -= copy;
+ }
+
+out_up:
+ mutex_unlock(&sl->master->mutex);
+
+ return count;
+}
+
+static struct bin_attribute w1_f2d_bin_attr = {
+ .attr = {
+ .name = "eeprom",
+ .mode = S_IRUGO | S_IWUSR,
+ },
+ .size = W1_F2D_EEPROM_SIZE,
+ .read = w1_f2d_read_bin,
+ .write = w1_f2d_write_bin,
+};
+
+static int w1_f2d_add_slave(struct w1_slave *sl)
+{
+ return sysfs_create_bin_file(&sl->dev.kobj, &w1_f2d_bin_attr);
+}
+
+static void w1_f2d_remove_slave(struct w1_slave *sl)
+{
+ sysfs_remove_bin_file(&sl->dev.kobj, &w1_f2d_bin_attr);
+}
+
+static struct w1_family_ops w1_f2d_fops = {
+ .add_slave = w1_f2d_add_slave,
+ .remove_slave = w1_f2d_remove_slave,
+};
+
+static struct w1_family w1_family_2d = {
+ .fid = W1_EEPROM_DS2431,
+ .fops = &w1_f2d_fops,
+};
+
+static int __init w1_f2d_init(void)
+{
+ return w1_register_family(&w1_family_2d);
+}
+
+static void __exit w1_f2d_fini(void)
+{
+ w1_unregister_family(&w1_family_2d);
+}
+
+module_init(w1_f2d_init);
+module_exit(w1_f2d_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bernhard Weirich <bernhard.weirich@riedel.net>");
+MODULE_DESCRIPTION("w1 family 2d driver for DS2431, 1kb EEPROM");
diff --git a/drivers/w1/slaves/w1_ds2760.c b/drivers/w1/slaves/w1_ds2760.c
index ed6b0576208c..1f09d4e4144c 100644
--- a/drivers/w1/slaves/w1_ds2760.c
+++ b/drivers/w1/slaves/w1_ds2760.c
@@ -80,7 +80,6 @@ static struct bin_attribute w1_ds2760_bin_attr = {
.attr = {
.name = "w1_slave",
.mode = S_IRUGO,
- .owner = THIS_MODULE,
},
.size = DS2760_DATA_SIZE,
.read = w1_ds2760_read_bin,
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index fb28acaeed6c..2c8dff9f77da 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -37,31 +37,33 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family.");
+/* Allow the strong pullup to be disabled, but default to enabled.
+ * If it was disabled a parasite powered device might not get the require
+ * current to do a temperature conversion. If it is enabled parasite powered
+ * devices have a better chance of getting the current required.
+ */
+static int w1_strong_pullup = 1;
+module_param_named(strong_pullup, w1_strong_pullup, int, 0);
+
static u8 bad_roms[][9] = {
{0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87},
{}
};
-static ssize_t w1_therm_read_bin(struct kobject *, struct bin_attribute *,
- char *, loff_t, size_t);
+static ssize_t w1_therm_read(struct device *device,
+ struct device_attribute *attr, char *buf);
-static struct bin_attribute w1_therm_bin_attr = {
- .attr = {
- .name = "w1_slave",
- .mode = S_IRUGO,
- },
- .size = W1_SLAVE_DATA_SIZE,
- .read = w1_therm_read_bin,
-};
+static struct device_attribute w1_therm_attr =
+ __ATTR(w1_slave, S_IRUGO, w1_therm_read, NULL);
static int w1_therm_add_slave(struct w1_slave *sl)
{
- return sysfs_create_bin_file(&sl->dev.kobj, &w1_therm_bin_attr);
+ return device_create_file(&sl->dev, &w1_therm_attr);
}
static void w1_therm_remove_slave(struct w1_slave *sl)
{
- sysfs_remove_bin_file(&sl->dev.kobj, &w1_therm_bin_attr);
+ device_remove_file(&sl->dev, &w1_therm_attr);
}
static struct w1_family_ops w1_therm_fops = {
@@ -160,30 +162,19 @@ static int w1_therm_check_rom(u8 rom[9])
return 0;
}
-static ssize_t w1_therm_read_bin(struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t off, size_t count)
+static ssize_t w1_therm_read(struct device *device,
+ struct device_attribute *attr, char *buf)
{
- struct w1_slave *sl = kobj_to_w1_slave(kobj);
+ struct w1_slave *sl = dev_to_w1_slave(device);
struct w1_master *dev = sl->master;
u8 rom[9], crc, verdict;
int i, max_trying = 10;
+ ssize_t c = PAGE_SIZE;
- mutex_lock(&sl->master->mutex);
+ mutex_lock(&dev->mutex);
- if (off > W1_SLAVE_DATA_SIZE) {
- count = 0;
- goto out;
- }
- if (off + count > W1_SLAVE_DATA_SIZE) {
- count = 0;
- goto out;
- }
-
- memset(buf, 0, count);
memset(rom, 0, sizeof(rom));
- count = 0;
verdict = 0;
crc = 0;
@@ -192,15 +183,20 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj,
int count = 0;
unsigned int tm = 750;
+ /* 750ms strong pullup (or delay) after the convert */
+ if (w1_strong_pullup)
+ w1_next_pullup(dev, tm);
w1_write_8(dev, W1_CONVERT_TEMP);
-
- msleep(tm);
+ if (!w1_strong_pullup)
+ msleep(tm);
if (!w1_reset_select_slave(sl)) {
w1_write_8(dev, W1_READ_SCRATCHPAD);
if ((count = w1_read_block(dev, rom, 9)) != 9) {
- dev_warn(&dev->dev, "w1_read_block() returned %d instead of 9.\n", count);
+ dev_warn(device, "w1_read_block() "
+ "returned %u instead of 9.\n",
+ count);
}
crc = w1_calc_crc8(rom, 8);
@@ -215,22 +211,22 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj,
}
for (i = 0; i < 9; ++i)
- count += sprintf(buf + count, "%02x ", rom[i]);
- count += sprintf(buf + count, ": crc=%02x %s\n",
+ c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", rom[i]);
+ c -= snprintf(buf + PAGE_SIZE - c, c, ": crc=%02x %s\n",
crc, (verdict) ? "YES" : "NO");
if (verdict)
memcpy(sl->rom, rom, sizeof(sl->rom));
else
- dev_warn(&dev->dev, "18S20 doesn't respond to CONVERT_TEMP.\n");
+ dev_warn(device, "18S20 doesn't respond to CONVERT_TEMP.\n");
for (i = 0; i < 9; ++i)
- count += sprintf(buf + count, "%02x ", sl->rom[i]);
+ c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", sl->rom[i]);
- count += sprintf(buf + count, "t=%d\n", w1_convert_temp(rom, sl->family->fid));
-out:
+ c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n",
+ w1_convert_temp(rom, sl->family->fid));
mutex_unlock(&dev->mutex);
- return count;
+ return PAGE_SIZE - c;
}
static int __init w1_therm_init(void)
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-11 07:20:09 +0100