Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/w1-2.6
diff --git a/Documentation/w1/w1.generic b/Documentation/w1/w1.generic
index eace304..f937fbe 100644
--- a/Documentation/w1/w1.generic
+++ b/Documentation/w1/w1.generic
@@ -1,19 +1,92 @@
-Any w1 device must be connected to w1 bus master device - for example
-ds9490 usb device or w1-over-GPIO or RS232 converter.
-Driver for w1 bus master must provide several functions(you can find
-them in struct w1_bus_master definition in w1.h) which then will be
-called by w1 core to send various commands over w1 bus(by default it is
-reset and search commands). When some device is found on the bus, w1 core
-checks if driver for it's family is loaded.
-If driver is loaded w1 core creates new w1_slave object and registers it
-in the system(creates some generic sysfs files(struct w1_family_ops in
-w1_family.h), notifies any registered listener and so on...).
-It is device driver's business to provide any communication method
-upstream.
-For example w1_therm driver(ds18?20 thermal sensor family driver)
-provides temperature reading function which is bound to ->rbin() method
-of the above w1_family_ops structure.
-w1_smem - driver for simple 64bit memory cell provides ID reading
-method.
+The 1-wire (w1) subsystem
+------------------------------------------------------------------
+The 1-wire bus is a simple master-slave bus that communicates via a single
+signal wire (plus ground, so two wires).
+
+Devices communicate on the bus by pulling the signal to ground via an open
+drain output and by sampling the logic level of the signal line.
+
+The w1 subsystem provides the framework for managing w1 masters and
+communication with slaves.
+
+All w1 slave devices must be connected to a w1 bus master device.
+
+Example w1 master devices:
+ DS9490 usb device
+ W1-over-GPIO
+ DS2482 (i2c to w1 bridge)
+ Emulated devices, such as a RS232 converter, parallel port adapter, etc
+
+
+What does the w1 subsystem do?
+------------------------------------------------------------------
+When a w1 master driver registers with the w1 subsystem, the following occurs:
+
+ - sysfs entries for that w1 master are created
+ - the w1 bus is periodically searched for new slave devices
+
+When a device is found on the bus, w1 core checks if driver for it's family is
+loaded. If so, the family driver is attached to the slave.
+If there is no driver for the family, a simple sysfs entry is created
+for the slave device.
+
+
+W1 device families
+------------------------------------------------------------------
+Slave devices are handled by a driver written for a family of w1 devices.
+
+A family driver populates a struct w1_family_ops (see w1_family.h) and
+registers with the w1 subsystem.
+
+Current family drivers:
+w1_therm - (ds18?20 thermal sensor family driver)
+ provides temperature reading function which is bound to ->rbin() method
+ of the above w1_family_ops structure.
+
+w1_smem - driver for simple 64bit memory cell provides ID reading method.
You can call above methods by reading appropriate sysfs files.
+
+
+What does a w1 master driver need to implement?
+------------------------------------------------------------------
+
+The driver for w1 bus master must provide at minimum two functions.
+
+Emulated devices must provide the ability to set the output signal level
+(write_bit) and sample the signal level (read_bit).
+
+Devices that support the 1-wire natively must provide the ability to write and
+sample a bit (touch_bit) and reset the bus (reset_bus).
+
+Most hardware provides higher-level functions that offload w1 handling.
+See struct w1_bus_master definition in w1.h for details.
+
+
+w1 master sysfs interface
+------------------------------------------------------------------
+<xx-xxxxxxxxxxxxx> - a directory for a found device. The format is family-serial
+bus - (standard) symlink to the w1 bus
+driver - (standard) symlink to the w1 driver
+w1_master_attempts - the number of times a search was attempted
+w1_master_max_slave_count
+ - the maximum slaves that may be attached to a master
+w1_master_name - the name of the device (w1_bus_masterX)
+w1_master_search - the number of searches left to do, -1=continual (default)
+w1_master_slave_count
+ - the number of slaves found
+w1_master_slaves - the names of the slaves, one per line
+w1_master_timeout - the delay in seconds between searches
+
+If you have a w1 bus that never changes (you don't add or remove devices),
+you can set w1_master_search to a positive value to disable searches.
+
+
+w1 slave sysfs interface
+------------------------------------------------------------------
+bus - (standard) symlink to the w1 bus
+driver - (standard) symlink to the w1 driver
+name - the device name, usually the same as the directory name
+w1_slave - (optional) a binary file whose meaning depends on the
+ family driver
+
diff --git a/drivers/w1/Kconfig b/drivers/w1/Kconfig
index 2ab65c9..4f12079 100644
--- a/drivers/w1/Kconfig
+++ b/drivers/w1/Kconfig
@@ -3,9 +3,9 @@
config W1
tristate "Dallas's 1-wire support"
---help---
- Dallas's 1-wire bus is usefull to connect slow 1-pin devices
+ Dallas's 1-wire bus is usefull to connect slow 1-pin devices
such as iButtons and thermal sensors.
-
+
If you want W1 support, you should say Y here.
This W1 support can also be built as a module. If so, the module
@@ -17,8 +17,8 @@
help
Say Y here if you want to communicate with your 1-wire devices
using Matrox's G400 GPIO pins.
-
- This support is also available as a module. If so, the module
+
+ This support is also available as a module. If so, the module
will be called matrox_w1.ko.
config W1_DS9490
@@ -27,17 +27,17 @@
help
Say Y here if you want to have a driver for DS9490R UWB <-> W1 bridge.
- This support is also available as a module. If so, the module
+ This support is also available as a module. If so, the module
will be called ds9490r.ko.
-config W1_DS9490_BRIDGE
+config W1_DS9490R_BRIDGE
tristate "DS9490R USB <-> W1 transport layer for 1-wire"
depends on W1_DS9490
help
Say Y here if you want to communicate with your 1-wire devices
using DS9490R USB bridge.
- This support is also available as a module. If so, the module
+ This support is also available as a module. If so, the module
will be called ds_w1_bridge.ko.
config W1_THERM
@@ -51,7 +51,7 @@
tristate "Simple 64bit memory family implementation"
depends on W1
help
- Say Y here if you want to connect 1-wire
+ Say Y here if you want to connect 1-wire
simple 64bit memory rom(ds2401/ds2411/ds1990*) to you wire.
endmenu
diff --git a/drivers/w1/ds_w1_bridge.c b/drivers/w1/ds_w1_bridge.c
index 0baaeb5..7bddd8a 100644
--- a/drivers/w1/ds_w1_bridge.c
+++ b/drivers/w1/ds_w1_bridge.c
@@ -83,11 +83,11 @@
return byte;
}
-static void ds9490r_write_block(unsigned long data, u8 *buf, int len)
+static void ds9490r_write_block(unsigned long data, const u8 *buf, int len)
{
struct ds_device *dev = (struct ds_device *)data;
- ds_write_block(dev, buf, len);
+ ds_write_block(dev, (u8 *)buf, len);
}
static u8 ds9490r_read_block(unsigned long data, u8 *buf, int len)
diff --git a/drivers/w1/matrox_w1.c b/drivers/w1/matrox_w1.c
index e565416..0b03f8f 100644
--- a/drivers/w1/matrox_w1.c
+++ b/drivers/w1/matrox_w1.c
@@ -1,8 +1,8 @@
/*
- * matrox_w1.c
+ * matrox_w1.c
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -59,7 +59,7 @@
.remove = __devexit_p(matrox_w1_remove),
};
-/*
+/*
* Matrox G400 DDC registers.
*/
@@ -177,8 +177,8 @@
dev->bus_master = (struct w1_bus_master *)(dev + 1);
- /*
- * True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c
+ /*
+ * True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c
*/
dev->phys_addr = pci_resource_start(pdev, 1);
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 24a192e..b460927 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -1,8 +1,8 @@
/*
- * w1.c
+ * w1.c
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -59,6 +59,19 @@
static int control_needs_exit;
static DECLARE_COMPLETION(w1_control_complete);
+/* stuff for the default family */
+static ssize_t w1_famdefault_read_name(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+ return(sprintf(buf, "%s\n", sl->name));
+}
+static struct w1_family_ops w1_default_fops = {
+ .rname = &w1_famdefault_read_name,
+};
+static struct w1_family w1_default_family = {
+ .fops = &w1_default_fops,
+};
+
static int w1_master_match(struct device *dev, struct device_driver *drv)
{
return 1;
@@ -99,6 +112,20 @@
return sprintf(buf, "No family registered.\n");
}
+static struct device_attribute w1_slave_attribute =
+ __ATTR(name, S_IRUGO, w1_default_read_name, NULL);
+
+static struct bin_attribute w1_slave_bin_attribute = {
+ .attr = {
+ .name = "w1_slave",
+ .mode = S_IRUGO,
+ .owner = THIS_MODULE,
+ },
+ .size = W1_SLAVE_DATA_SIZE,
+ .read = &w1_default_read_bin,
+};
+
+
static struct bus_type w1_bus_type = {
.name = "w1",
.match = w1_master_match,
@@ -119,34 +146,49 @@
.release = &w1_master_release
};
-static struct device_attribute w1_slave_attribute = {
- .attr = {
- .name = "name",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_default_read_name,
-};
-
-static struct device_attribute w1_slave_attribute_val = {
- .attr = {
- .name = "value",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_default_read_name,
-};
-
static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct w1_master *md = container_of (dev, struct w1_master, dev);
+ struct w1_master *md = container_of(dev, struct w1_master, dev);
ssize_t count;
-
+
if (down_interruptible (&md->mutex))
return -EBUSY;
count = sprintf(buf, "%s\n", md->name);
-
+
+ up(&md->mutex);
+
+ return count;
+}
+
+static ssize_t w1_master_attribute_store_search(struct device * dev,
+ struct device_attribute *attr,
+ const char * buf, size_t count)
+{
+ struct w1_master *md = container_of(dev, struct w1_master, dev);
+
+ if (down_interruptible (&md->mutex))
+ return -EBUSY;
+
+ md->search_count = simple_strtol(buf, NULL, 0);
+
+ up(&md->mutex);
+
+ return count;
+}
+
+static ssize_t w1_master_attribute_show_search(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct w1_master *md = container_of(dev, struct w1_master, dev);
+ ssize_t count;
+
+ if (down_interruptible (&md->mutex))
+ return -EBUSY;
+
+ count = sprintf(buf, "%d\n", md->search_count);
+
up(&md->mutex);
return count;
@@ -156,12 +198,12 @@
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
ssize_t count;
-
+
if (down_interruptible(&md->mutex))
return -EBUSY;
count = sprintf(buf, "0x%p\n", md->bus_master);
-
+
up(&md->mutex);
return count;
}
@@ -177,12 +219,12 @@
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
ssize_t count;
-
+
if (down_interruptible(&md->mutex))
return -EBUSY;
count = sprintf(buf, "%d\n", md->max_slave_count);
-
+
up(&md->mutex);
return count;
}
@@ -191,12 +233,12 @@
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
ssize_t count;
-
+
if (down_interruptible(&md->mutex))
return -EBUSY;
count = sprintf(buf, "%lu\n", md->attempts);
-
+
up(&md->mutex);
return count;
}
@@ -205,18 +247,17 @@
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
ssize_t count;
-
+
if (down_interruptible(&md->mutex))
return -EBUSY;
count = sprintf(buf, "%d\n", md->slave_count);
-
+
up(&md->mutex);
return count;
}
static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf)
-
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
int c = PAGE_SIZE;
@@ -233,7 +274,7 @@
list_for_each_safe(ent, n, &md->slist) {
sl = list_entry(ent, struct w1_slave, w1_slave_entry);
- c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
+ c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
}
}
@@ -242,73 +283,52 @@
return PAGE_SIZE - c;
}
-static struct device_attribute w1_master_attribute_slaves = {
- .attr = {
- .name = "w1_master_slaves",
- .mode = S_IRUGO,
- .owner = THIS_MODULE,
- },
- .show = &w1_master_attribute_show_slaves,
-};
-static struct device_attribute w1_master_attribute_slave_count = {
- .attr = {
- .name = "w1_master_slave_count",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_slave_count,
-};
-static struct device_attribute w1_master_attribute_attempts = {
- .attr = {
- .name = "w1_master_attempts",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_attempts,
-};
-static struct device_attribute w1_master_attribute_max_slave_count = {
- .attr = {
- .name = "w1_master_max_slave_count",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_max_slave_count,
-};
-static struct device_attribute w1_master_attribute_timeout = {
- .attr = {
- .name = "w1_master_timeout",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_timeout,
-};
-static struct device_attribute w1_master_attribute_pointer = {
- .attr = {
- .name = "w1_master_pointer",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_pointer,
-};
-static struct device_attribute w1_master_attribute_name = {
- .attr = {
- .name = "w1_master_name",
- .mode = S_IRUGO,
- .owner = THIS_MODULE
- },
- .show = &w1_master_attribute_show_name,
+#define W1_MASTER_ATTR_RO(_name, _mode) \
+ struct device_attribute w1_master_attribute_##_name = \
+ __ATTR(w1_master_##_name, _mode, \
+ w1_master_attribute_show_##_name, NULL)
+
+#define W1_MASTER_ATTR_RW(_name, _mode) \
+ struct device_attribute w1_master_attribute_##_name = \
+ __ATTR(w1_master_##_name, _mode, \
+ w1_master_attribute_show_##_name, \
+ w1_master_attribute_store_##_name)
+
+static W1_MASTER_ATTR_RO(name, S_IRUGO);
+static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
+static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
+static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
+static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
+static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
+static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
+static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO);
+
+static struct attribute *w1_master_default_attrs[] = {
+ &w1_master_attribute_name.attr,
+ &w1_master_attribute_slaves.attr,
+ &w1_master_attribute_slave_count.attr,
+ &w1_master_attribute_max_slave_count.attr,
+ &w1_master_attribute_attempts.attr,
+ &w1_master_attribute_timeout.attr,
+ &w1_master_attribute_pointer.attr,
+ &w1_master_attribute_search.attr,
+ NULL
};
-static struct bin_attribute w1_slave_bin_attribute = {
- .attr = {
- .name = "w1_slave",
- .mode = S_IRUGO,
- .owner = THIS_MODULE,
- },
- .size = W1_SLAVE_DATA_SIZE,
- .read = &w1_default_read_bin,
+static struct attribute_group w1_master_defattr_group = {
+ .attrs = w1_master_default_attrs,
};
+int w1_create_master_attributes(struct w1_master *master)
+{
+ return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
+}
+
+void w1_destroy_master_attributes(struct w1_master *master)
+{
+ sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
+}
+
static int __w1_attach_slave_device(struct w1_slave *sl)
{
int err;
@@ -319,13 +339,13 @@
sl->dev.release = &w1_slave_release;
snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id),
- "%02x-%012llx",
- (unsigned int) sl->reg_num.family,
- (unsigned long long) sl->reg_num.id);
- snprintf (&sl->name[0], sizeof(sl->name),
- "%02x-%012llx",
- (unsigned int) sl->reg_num.family,
- (unsigned long long) sl->reg_num.id);
+ "%02x-%012llx",
+ (unsigned int) sl->reg_num.family,
+ (unsigned long long) sl->reg_num.id);
+ snprintf(&sl->name[0], sizeof(sl->name),
+ "%02x-%012llx",
+ (unsigned int) sl->reg_num.family,
+ (unsigned long long) sl->reg_num.id);
dev_dbg(&sl->dev, "%s: registering %s.\n", __func__,
&sl->dev.bus_id[0]);
@@ -333,48 +353,36 @@
err = device_register(&sl->dev);
if (err < 0) {
dev_err(&sl->dev,
- "Device registration [%s] failed. err=%d\n",
- sl->dev.bus_id, err);
+ "Device registration [%s] failed. err=%d\n",
+ sl->dev.bus_id, err);
return err;
}
memcpy(&sl->attr_bin, &w1_slave_bin_attribute, sizeof(sl->attr_bin));
memcpy(&sl->attr_name, &w1_slave_attribute, sizeof(sl->attr_name));
- memcpy(&sl->attr_val, &w1_slave_attribute_val, sizeof(sl->attr_val));
-
+
sl->attr_bin.read = sl->family->fops->rbin;
sl->attr_name.show = sl->family->fops->rname;
- sl->attr_val.show = sl->family->fops->rval;
- sl->attr_val.attr.name = sl->family->fops->rvalname;
err = device_create_file(&sl->dev, &sl->attr_name);
if (err < 0) {
dev_err(&sl->dev,
- "sysfs file creation for [%s] failed. err=%d\n",
- sl->dev.bus_id, err);
+ "sysfs file creation for [%s] failed. err=%d\n",
+ sl->dev.bus_id, err);
device_unregister(&sl->dev);
return err;
}
- err = device_create_file(&sl->dev, &sl->attr_val);
- if (err < 0) {
- dev_err(&sl->dev,
- "sysfs file creation for [%s] failed. err=%d\n",
- sl->dev.bus_id, err);
- device_remove_file(&sl->dev, &sl->attr_name);
- device_unregister(&sl->dev);
- return err;
- }
-
- err = sysfs_create_bin_file(&sl->dev.kobj, &sl->attr_bin);
- if (err < 0) {
- dev_err(&sl->dev,
- "sysfs file creation for [%s] failed. err=%d\n",
- sl->dev.bus_id, err);
- device_remove_file(&sl->dev, &sl->attr_name);
- device_remove_file(&sl->dev, &sl->attr_val);
- device_unregister(&sl->dev);
- return err;
+ if ( sl->attr_bin.read ) {
+ err = sysfs_create_bin_file(&sl->dev.kobj, &sl->attr_bin);
+ if (err < 0) {
+ dev_err(&sl->dev,
+ "sysfs file creation for [%s] failed. err=%d\n",
+ sl->dev.bus_id, err);
+ device_remove_file(&sl->dev, &sl->attr_name);
+ device_unregister(&sl->dev);
+ return err;
+ }
}
list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
@@ -410,12 +418,10 @@
spin_lock(&w1_flock);
f = w1_family_registered(rn->family);
if (!f) {
- spin_unlock(&w1_flock);
+ f= &w1_default_family;
dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n",
rn->family, rn->family,
(unsigned long long)rn->id, rn->crc);
- kfree(sl);
- return -ENODEV;
}
__w1_family_get(f);
spin_unlock(&w1_flock);
@@ -445,7 +451,7 @@
static void w1_slave_detach(struct w1_slave *sl)
{
struct w1_netlink_msg msg;
-
+
dev_info(&sl->dev, "%s: detaching %s.\n", __func__, sl->name);
while (atomic_read(&sl->refcnt)) {
@@ -456,12 +462,15 @@
flush_signals(current);
}
- sysfs_remove_bin_file (&sl->dev.kobj, &sl->attr_bin);
+ if ( sl->attr_bin.read ) {
+ sysfs_remove_bin_file (&sl->dev.kobj, &sl->attr_bin);
+ }
device_remove_file(&sl->dev, &sl->attr_name);
- device_remove_file(&sl->dev, &sl->attr_val);
device_unregister(&sl->dev);
w1_family_put(sl->family);
+ sl->master->slave_count--;
+
memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id));
msg.type = W1_SLAVE_REMOVE;
w1_netlink_send(sl->master, &msg);
@@ -471,8 +480,8 @@
{
struct w1_master *dev;
int found = 0;
-
- spin_lock_irq(&w1_mlock);
+
+ spin_lock_bh(&w1_mlock);
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
if (dev->bus_master->data == data) {
found = 1;
@@ -480,12 +489,26 @@
break;
}
}
- spin_unlock_irq(&w1_mlock);
+ spin_unlock_bh(&w1_mlock);
return (found)?dev:NULL;
}
-void w1_slave_found(unsigned long data, u64 rn)
+void w1_reconnect_slaves(struct w1_family *f)
+{
+ struct w1_master *dev;
+
+ spin_lock_bh(&w1_mlock);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry) {
+ dev_info(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n",
+ dev->name, f->fid);
+ set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
+ }
+ spin_unlock_bh(&w1_mlock);
+}
+
+
+static void w1_slave_found(unsigned long data, u64 rn)
{
int slave_count;
struct w1_slave *sl;
@@ -500,7 +523,7 @@
data);
return;
}
-
+
tmp = (struct w1_reg_num *) &rn;
slave_count = 0;
@@ -513,8 +536,7 @@
sl->reg_num.crc == tmp->crc) {
set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
break;
- }
- else if (sl->reg_num.family == tmp->family) {
+ } else if (sl->reg_num.family == tmp->family) {
family_found = 1;
break;
}
@@ -528,30 +550,43 @@
rn && ((le64_to_cpu(rn) >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn, 7)) {
w1_attach_slave_device(dev, tmp);
}
-
+
atomic_dec(&dev->refcnt);
}
-void w1_search(struct w1_master *dev)
+/**
+ * Performs a ROM Search & registers any devices found.
+ * The 1-wire search is a simple binary tree search.
+ * For each bit of the address, we read two bits and write one bit.
+ * The bit written will put to sleep all devies that don't match that bit.
+ * When the two reads differ, the direction choice is obvious.
+ * When both bits are 0, we must choose a path to take.
+ * When we can scan all 64 bits without having to choose a path, we are done.
+ *
+ * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
+ *
+ * @dev The master device to search
+ * @cb Function to call when a device is found
+ */
+void w1_search(struct w1_master *dev, w1_slave_found_callback cb)
{
- u64 last, rn, tmp;
- int i, count = 0;
- int last_family_desc, last_zero, last_device;
- int search_bit, id_bit, comp_bit, desc_bit;
+ u64 last_rn, rn, tmp64;
+ int i, slave_count = 0;
+ int last_zero, last_device;
+ int search_bit, desc_bit;
+ u8 triplet_ret = 0;
- search_bit = id_bit = comp_bit = 0;
- rn = tmp = last = 0;
- last_device = last_zero = last_family_desc = 0;
+ search_bit = 0;
+ rn = last_rn = 0;
+ last_device = 0;
+ last_zero = -1;
desc_bit = 64;
- while (!(id_bit && comp_bit) && !last_device
- && count++ < dev->max_slave_count) {
- last = rn;
+ while ( !last_device && (slave_count++ < dev->max_slave_count) ) {
+ last_rn = rn;
rn = 0;
- last_family_desc = 0;
-
/*
* Reset bus and all 1-wire device state machines
* so they can respond to our requests.
@@ -563,94 +598,46 @@
break;
}
-#if 1
+ /* Start the search */
w1_write_8(dev, W1_SEARCH);
for (i = 0; i < 64; ++i) {
- /*
- * Read 2 bits from bus.
- * All who don't sleep must send ID bit and COMPLEMENT ID bit.
- * They actually are ANDed between all senders.
- */
- id_bit = w1_touch_bit(dev, 1);
- comp_bit = w1_touch_bit(dev, 1);
+ /* Determine the direction/search bit */
+ if (i == desc_bit)
+ search_bit = 1; /* took the 0 path last time, so take the 1 path */
+ else if (i > desc_bit)
+ search_bit = 0; /* take the 0 path on the next branch */
+ else
+ search_bit = ((last_rn >> i) & 0x1);
- if (id_bit && comp_bit)
+ /** Read two bits and write one bit */
+ triplet_ret = w1_triplet(dev, search_bit);
+
+ /* quit if no device responded */
+ if ( (triplet_ret & 0x03) == 0x03 )
break;
- if (id_bit == 0 && comp_bit == 0) {
- if (i == desc_bit)
- search_bit = 1;
- else if (i > desc_bit)
- search_bit = 0;
- else
- search_bit = ((last >> i) & 0x1);
+ /* If both directions were valid, and we took the 0 path... */
+ if (triplet_ret == 0)
+ last_zero = i;
- if (search_bit == 0) {
- last_zero = i;
- if (last_zero < 9)
- last_family_desc = last_zero;
- }
-
- }
- else
- search_bit = id_bit;
-
- tmp = search_bit;
- rn |= (tmp << i);
-
- /*
- * Write 1 bit to bus
- * and make all who don't have "search_bit" in "i"'th position
- * in it's registration number sleep.
- */
- if (dev->bus_master->touch_bit)
- w1_touch_bit(dev, search_bit);
- else
- w1_write_bit(dev, search_bit);
-
+ /* extract the direction taken & update the device number */
+ tmp64 = (triplet_ret >> 2);
+ rn |= (tmp64 << i);
}
-#endif
- if (desc_bit == last_zero)
- last_device = 1;
-
- desc_bit = last_zero;
-
- w1_slave_found(dev->bus_master->data, rn);
+ if ( (triplet_ret & 0x03) != 0x03 ) {
+ if ( (desc_bit == last_zero) || (last_zero < 0))
+ last_device = 1;
+ desc_bit = last_zero;
+ cb(dev->bus_master->data, rn);
+ }
}
}
-int w1_create_master_attributes(struct w1_master *dev)
+static int w1_control(void *data)
{
- if ( device_create_file(&dev->dev, &w1_master_attribute_slaves) < 0 ||
- device_create_file(&dev->dev, &w1_master_attribute_slave_count) < 0 ||
- device_create_file(&dev->dev, &w1_master_attribute_attempts) < 0 ||
- device_create_file(&dev->dev, &w1_master_attribute_max_slave_count) < 0 ||
- device_create_file(&dev->dev, &w1_master_attribute_timeout) < 0||
- device_create_file(&dev->dev, &w1_master_attribute_pointer) < 0||
- device_create_file(&dev->dev, &w1_master_attribute_name) < 0)
- return -EINVAL;
-
- return 0;
-}
-
-void w1_destroy_master_attributes(struct w1_master *dev)
-{
- device_remove_file(&dev->dev, &w1_master_attribute_slaves);
- device_remove_file(&dev->dev, &w1_master_attribute_slave_count);
- device_remove_file(&dev->dev, &w1_master_attribute_attempts);
- device_remove_file(&dev->dev, &w1_master_attribute_max_slave_count);
- device_remove_file(&dev->dev, &w1_master_attribute_timeout);
- device_remove_file(&dev->dev, &w1_master_attribute_pointer);
- device_remove_file(&dev->dev, &w1_master_attribute_name);
-}
-
-
-int w1_control(void *data)
-{
- struct w1_slave *sl;
- struct w1_master *dev;
- struct list_head *ent, *ment, *n, *mn;
+ struct w1_slave *sl, *sln;
+ struct w1_master *dev, *n;
int err, have_to_wait = 0;
daemonize("w1_control");
@@ -665,10 +652,8 @@
if (signal_pending(current))
flush_signals(current);
- list_for_each_safe(ment, mn, &w1_masters) {
- dev = list_entry(ment, struct w1_master, w1_master_entry);
-
- if (!control_needs_exit && !dev->need_exit)
+ list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) {
+ if (!control_needs_exit && !dev->flags)
continue;
/*
* Little race: we can create thread but not set the flag.
@@ -679,12 +664,8 @@
continue;
}
- spin_lock(&w1_mlock);
- list_del(&dev->w1_master_entry);
- spin_unlock(&w1_mlock);
-
if (control_needs_exit) {
- dev->need_exit = 1;
+ set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
err = kill_proc(dev->kpid, SIGTERM, 1);
if (err)
@@ -693,24 +674,42 @@
dev->kpid);
}
- wait_for_completion(&dev->dev_exited);
+ if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+ wait_for_completion(&dev->dev_exited);
+ spin_lock_bh(&w1_mlock);
+ list_del(&dev->w1_master_entry);
+ spin_unlock_bh(&w1_mlock);
- list_for_each_safe(ent, n, &dev->slist) {
- sl = list_entry(ent, struct w1_slave, w1_slave_entry);
-
- if (!sl)
- dev_warn(&dev->dev,
- "%s: slave entry is NULL.\n",
- __func__);
- else {
+ list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
list_del(&sl->w1_slave_entry);
w1_slave_detach(sl);
kfree(sl);
}
+ w1_destroy_master_attributes(dev);
+ atomic_dec(&dev->refcnt);
+ continue;
}
- w1_destroy_master_attributes(dev);
- atomic_dec(&dev->refcnt);
+
+ if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) {
+ dev_info(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name);
+ down(&dev->mutex);
+ list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
+ if (sl->family->fid == W1_FAMILY_DEFAULT) {
+ struct w1_reg_num rn;
+ list_del(&sl->w1_slave_entry);
+ w1_slave_detach(sl);
+
+ memcpy(&rn, &sl->reg_num, sizeof(rn));
+
+ kfree(sl);
+
+ w1_attach_slave_device(dev, &rn);
+ }
+ }
+ clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
+ up(&dev->mutex);
+ }
}
}
@@ -720,51 +719,50 @@
int w1_process(void *data)
{
struct w1_master *dev = (struct w1_master *) data;
- struct list_head *ent, *n;
- struct w1_slave *sl;
+ struct w1_slave *sl, *sln;
daemonize("%s", dev->name);
allow_signal(SIGTERM);
- while (!dev->need_exit) {
+ while (!test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
try_to_freeze(PF_FREEZE);
msleep_interruptible(w1_timeout * 1000);
if (signal_pending(current))
flush_signals(current);
- if (dev->need_exit)
+ if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
break;
if (!dev->initialized)
continue;
+ if (dev->search_count == 0)
+ continue;
+
if (down_interruptible(&dev->mutex))
continue;
- list_for_each_safe(ent, n, &dev->slist) {
- sl = list_entry(ent, struct w1_slave, w1_slave_entry);
+ list_for_each_entry(sl, &dev->slist, w1_slave_entry)
+ clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
- if (sl)
- clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
- }
-
w1_search_devices(dev, w1_slave_found);
- list_for_each_safe(ent, n, &dev->slist) {
- sl = list_entry(ent, struct w1_slave, w1_slave_entry);
-
- if (sl && !test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
+ list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
+ if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
list_del (&sl->w1_slave_entry);
w1_slave_detach (sl);
kfree (sl);
dev->slave_count--;
- }
- else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
+ } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
sl->ttl = dev->slave_ttl;
}
+
+ if (dev->search_count > 0)
+ dev->search_count--;
+
up(&dev->mutex);
}
@@ -774,7 +772,7 @@
return 0;
}
-int w1_init(void)
+static int w1_init(void)
{
int retval;
@@ -814,18 +812,14 @@
return retval;
}
-void w1_fini(void)
+static void w1_fini(void)
{
struct w1_master *dev;
- struct list_head *ent, *n;
- list_for_each_safe(ent, n, &w1_masters) {
- dev = list_entry(ent, struct w1_master, w1_master_entry);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry)
__w1_remove_master_device(dev);
- }
control_needs_exit = 1;
-
wait_for_completion(&w1_control_complete);
driver_unregister(&w1_driver);
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index abbddaf..4f0a986 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -1,8 +1,8 @@
/*
- * w1.h
+ * w1.h
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -74,36 +74,86 @@
int ttl;
struct w1_master *master;
- struct w1_family *family;
- struct device dev;
- struct completion dev_released;
+ struct w1_family *family;
+ struct device dev;
+ struct completion dev_released;
- struct bin_attribute attr_bin;
- struct device_attribute attr_name, attr_val;
+ struct bin_attribute attr_bin;
+ struct device_attribute attr_name;
};
typedef void (* w1_slave_found_callback)(unsigned long, u64);
+
+/**
+ * Note: read_bit and write_bit are very low level functions and should only
+ * be used with hardware that doesn't really support 1-wire operations,
+ * like a parallel/serial port.
+ * Either define read_bit and write_bit OR define, at minimum, touch_bit and
+ * reset_bus.
+ */
struct w1_bus_master
{
- unsigned long data;
+ /** the first parameter in all the functions below */
+ unsigned long data;
- u8 (*read_bit)(unsigned long);
- void (*write_bit)(unsigned long, u8);
-
- u8 (*read_byte)(unsigned long);
- void (*write_byte)(unsigned long, u8);
-
- u8 (*read_block)(unsigned long, u8 *, int);
- void (*write_block)(unsigned long, u8 *, int);
-
- u8 (*touch_bit)(unsigned long, u8);
-
- u8 (*reset_bus)(unsigned long);
+ /**
+ * Sample the line level
+ * @return the level read (0 or 1)
+ */
+ u8 (*read_bit)(unsigned long);
- void (*search)(unsigned long, w1_slave_found_callback);
+ /** Sets the line level */
+ void (*write_bit)(unsigned long, u8);
+
+ /**
+ * touch_bit is the lowest-level function for devices that really
+ * support the 1-wire protocol.
+ * touch_bit(0) = write-0 cycle
+ * touch_bit(1) = write-1 / read cycle
+ * @return the bit read (0 or 1)
+ */
+ u8 (*touch_bit)(unsigned long, u8);
+
+ /**
+ * Reads a bytes. Same as 8 touch_bit(1) calls.
+ * @return the byte read
+ */
+ u8 (*read_byte)(unsigned long);
+
+ /**
+ * Writes a byte. Same as 8 touch_bit(x) calls.
+ */
+ void (*write_byte)(unsigned long, u8);
+
+ /**
+ * Same as a series of read_byte() calls
+ * @return the number of bytes read
+ */
+ u8 (*read_block)(unsigned long, u8 *, int);
+
+ /** Same as a series of write_byte() calls */
+ void (*write_block)(unsigned long, const u8 *, int);
+
+ /**
+ * Combines two reads and a smart write for ROM searches
+ * @return bit0=Id bit1=comp_id bit2=dir_taken
+ */
+ u8 (*triplet)(unsigned long, u8);
+
+ /**
+ * long write-0 with a read for the presence pulse detection
+ * @return -1=Error, 0=Device present, 1=No device present
+ */
+ u8 (*reset_bus)(unsigned long);
+
+ /** Really nice hardware can handles the ROM searches */
+ void (*search)(unsigned long, w1_slave_found_callback);
};
+#define W1_MASTER_NEED_EXIT 0
+#define W1_MASTER_NEED_RECONNECT 1
+
struct w1_master
{
struct list_head w1_master_entry;
@@ -115,30 +165,31 @@
int slave_ttl;
int initialized;
u32 id;
+ int search_count;
atomic_t refcnt;
void *priv;
int priv_size;
- int need_exit;
+ long flags;
+
pid_t kpid;
- struct semaphore mutex;
+ struct semaphore mutex;
struct device_driver *driver;
- struct device dev;
- struct completion dev_released;
- struct completion dev_exited;
+ struct device dev;
+ struct completion dev_released;
+ struct completion dev_exited;
struct w1_bus_master *bus_master;
u32 seq, groups;
- struct sock *nls;
+ struct sock *nls;
};
int w1_create_master_attributes(struct w1_master *);
-void w1_destroy_master_attributes(struct w1_master *);
-void w1_search(struct w1_master *dev);
+void w1_search(struct w1_master *dev, w1_slave_found_callback cb);
#endif /* __KERNEL__ */
diff --git a/drivers/w1/w1_family.c b/drivers/w1/w1_family.c
index d1d56ec..02eee57 100644
--- a/drivers/w1/w1_family.c
+++ b/drivers/w1/w1_family.c
@@ -1,8 +1,8 @@
/*
- * w1_family.c
+ * w1_family.c
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -27,10 +27,11 @@
DEFINE_SPINLOCK(w1_flock);
static LIST_HEAD(w1_families);
+extern void w1_reconnect_slaves(struct w1_family *f);
static int w1_check_family(struct w1_family *f)
{
- if (!f->fops->rname || !f->fops->rbin || !f->fops->rval || !f->fops->rvalname)
+ if (!f->fops->rname || !f->fops->rbin)
return -EINVAL;
return 0;
@@ -60,9 +61,10 @@
newf->need_exit = 0;
list_add_tail(&newf->family_entry, &w1_families);
}
-
spin_unlock(&w1_flock);
+ w1_reconnect_slaves(newf);
+
return ret;
}
diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h
index 07fa494..b26da01 100644
--- a/drivers/w1/w1_family.h
+++ b/drivers/w1/w1_family.h
@@ -1,8 +1,8 @@
/*
- * w1_family.h
+ * w1_family.h
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -27,8 +27,11 @@
#include <asm/atomic.h>
#define W1_FAMILY_DEFAULT 0
-#define W1_FAMILY_THERM 0x10
-#define W1_FAMILY_SMEM 0x01
+#define W1_FAMILY_SMEM_01 0x01
+#define W1_FAMILY_SMEM_81 0x81
+#define W1_THERM_DS18S20 0x10
+#define W1_THERM_DS1822 0x22
+#define W1_THERM_DS18B20 0x28
#define MAXNAMELEN 32
@@ -36,18 +39,15 @@
{
ssize_t (* rname)(struct device *, struct device_attribute *, char *);
ssize_t (* rbin)(struct kobject *, char *, loff_t, size_t);
-
- ssize_t (* rval)(struct device *, struct device_attribute *, char *);
- unsigned char rvalname[MAXNAMELEN];
};
struct w1_family
{
struct list_head family_entry;
u8 fid;
-
+
struct w1_family_ops *fops;
-
+
atomic_t refcnt;
u8 need_exit;
};
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
index 5f0bafb..35e85d9 100644
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -1,8 +1,8 @@
/*
- * w1_int.c
+ * w1_int.c
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -39,8 +39,9 @@
extern int w1_process(void *);
-struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
- struct device_driver *driver, struct device *device)
+static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
+ struct device_driver *driver,
+ struct device *device)
{
struct w1_master *dev;
int err;
@@ -60,14 +61,15 @@
dev->bus_master = (struct w1_bus_master *)(dev + 1);
- dev->owner = THIS_MODULE;
- dev->max_slave_count = slave_count;
- dev->slave_count = 0;
- dev->attempts = 0;
- dev->kpid = -1;
- dev->initialized = 0;
- dev->id = id;
+ dev->owner = THIS_MODULE;
+ dev->max_slave_count = slave_count;
+ dev->slave_count = 0;
+ dev->attempts = 0;
+ dev->kpid = -1;
+ dev->initialized = 0;
+ dev->id = id;
dev->slave_ttl = slave_ttl;
+ dev->search_count = -1; /* continual scan */
atomic_set(&dev->refcnt, 2);
@@ -105,7 +107,7 @@
return dev;
}
-void w1_free_dev(struct w1_master *dev)
+static void w1_free_dev(struct w1_master *dev)
{
device_unregister(&dev->dev);
if (dev->nls && dev->nls->sk_socket)
@@ -120,6 +122,13 @@
int retval = 0;
struct w1_netlink_msg msg;
+ /* validate minimum functionality */
+ if (!(master->touch_bit && master->reset_bus) &&
+ !(master->write_bit && master->read_bit)) {
+ printk(KERN_ERR "w1_add_master_device: invalid function set\n");
+ return(-EINVAL);
+ }
+
dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_driver, &w1_device);
if (!dev)
return -ENOMEM;
@@ -153,7 +162,7 @@
return 0;
err_out_kill_thread:
- dev->need_exit = 1;
+ set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
if (kill_proc(dev->kpid, SIGTERM, 1))
dev_err(&dev->dev,
"Failed to send signal to w1 kernel thread %d.\n",
@@ -171,7 +180,7 @@
int err;
struct w1_netlink_msg msg;
- dev->need_exit = 1;
+ set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
err = kill_proc(dev->kpid, SIGTERM, 1);
if (err)
dev_err(&dev->dev,
@@ -197,10 +206,8 @@
void w1_remove_master_device(struct w1_bus_master *bm)
{
struct w1_master *dev = NULL;
- struct list_head *ent, *n;
- list_for_each_safe(ent, n, &w1_masters) {
- dev = list_entry(ent, struct w1_master, w1_master_entry);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry) {
if (!dev->initialized)
continue;
diff --git a/drivers/w1/w1_int.h b/drivers/w1/w1_int.h
index fdb531e..4274082 100644
--- a/drivers/w1/w1_int.h
+++ b/drivers/w1/w1_int.h
@@ -1,8 +1,8 @@
/*
- * w1_int.h
+ * w1_int.h
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -27,8 +27,6 @@
#include "w1.h"
-struct w1_master * w1_alloc_dev(u32, int, int, struct device_driver *, struct device *);
-void w1_free_dev(struct w1_master *dev);
int w1_add_master_device(struct w1_bus_master *);
void w1_remove_master_device(struct w1_bus_master *);
void __w1_remove_master_device(struct w1_master *);
diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c
index 02796b5..00f0322 100644
--- a/drivers/w1/w1_io.c
+++ b/drivers/w1/w1_io.c
@@ -1,8 +1,8 @@
/*
- * w1_io.c
+ * w1_io.c
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -55,15 +55,29 @@
udelay(tm * w1_delay_parm);
}
+static void w1_write_bit(struct w1_master *dev, int bit);
+static u8 w1_read_bit(struct w1_master *dev);
+
+/**
+ * Generates a write-0 or write-1 cycle and samples the level.
+ */
u8 w1_touch_bit(struct w1_master *dev, int bit)
{
if (dev->bus_master->touch_bit)
return dev->bus_master->touch_bit(dev->bus_master->data, bit);
- else
+ else if (bit)
return w1_read_bit(dev);
+ else {
+ w1_write_bit(dev, 0);
+ return(0);
+ }
}
-void w1_write_bit(struct w1_master *dev, int bit)
+/**
+ * Generates a write-0 or write-1 cycle.
+ * Only call if dev->bus_master->touch_bit is NULL
+ */
+static void w1_write_bit(struct w1_master *dev, int bit)
{
if (bit) {
dev->bus_master->write_bit(dev->bus_master->data, 0);
@@ -78,6 +92,12 @@
}
}
+/**
+ * Writes 8 bits.
+ *
+ * @param dev the master device
+ * @param byte the byte to write
+ */
void w1_write_8(struct w1_master *dev, u8 byte)
{
int i;
@@ -86,10 +106,15 @@
dev->bus_master->write_byte(dev->bus_master->data, byte);
else
for (i = 0; i < 8; ++i)
- w1_write_bit(dev, (byte >> i) & 0x1);
+ w1_touch_bit(dev, (byte >> i) & 0x1);
}
-u8 w1_read_bit(struct w1_master *dev)
+
+/**
+ * Generates a write-1 cycle and samples the level.
+ * Only call if dev->bus_master->touch_bit is NULL
+ */
+static u8 w1_read_bit(struct w1_master *dev)
{
int result;
@@ -104,6 +129,53 @@
return result & 0x1;
}
+/**
+ * Does a triplet - used for searching ROM addresses.
+ * Return bits:
+ * bit 0 = id_bit
+ * bit 1 = comp_bit
+ * bit 2 = dir_taken
+ * If both bits 0 & 1 are set, the search should be restarted.
+ *
+ * @param dev the master device
+ * @param bdir the bit to write if both id_bit and comp_bit are 0
+ * @return bit fields - see above
+ */
+u8 w1_triplet(struct w1_master *dev, int bdir)
+{
+ if ( dev->bus_master->triplet )
+ return(dev->bus_master->triplet(dev->bus_master->data, bdir));
+ else {
+ u8 id_bit = w1_touch_bit(dev, 1);
+ u8 comp_bit = w1_touch_bit(dev, 1);
+ u8 retval;
+
+ if ( id_bit && comp_bit )
+ return(0x03); /* error */
+
+ if ( !id_bit && !comp_bit ) {
+ /* Both bits are valid, take the direction given */
+ retval = bdir ? 0x04 : 0;
+ } else {
+ /* Only one bit is valid, take that direction */
+ bdir = id_bit;
+ retval = id_bit ? 0x05 : 0x02;
+ }
+
+ if ( dev->bus_master->touch_bit )
+ w1_touch_bit(dev, bdir);
+ else
+ w1_write_bit(dev, bdir);
+ return(retval);
+ }
+}
+
+/**
+ * Reads 8 bits.
+ *
+ * @param dev the master device
+ * @return the byte read
+ */
u8 w1_read_8(struct w1_master * dev)
{
int i;
@@ -113,12 +185,20 @@
res = dev->bus_master->read_byte(dev->bus_master->data);
else
for (i = 0; i < 8; ++i)
- res |= (w1_read_bit(dev) << i);
+ res |= (w1_touch_bit(dev,1) << i);
return res;
}
-void w1_write_block(struct w1_master *dev, u8 *buf, int len)
+/**
+ * Writes a series of bytes.
+ *
+ * @param dev the master device
+ * @param buf pointer to the data to write
+ * @param len the number of bytes to write
+ * @return the byte read
+ */
+void w1_write_block(struct w1_master *dev, const u8 *buf, int len)
{
int i;
@@ -129,6 +209,14 @@
w1_write_8(dev, buf[i]);
}
+/**
+ * Reads a series of bytes.
+ *
+ * @param dev the master device
+ * @param buf pointer to the buffer to fill
+ * @param len the number of bytes to read
+ * @return the number of bytes read
+ */
u8 w1_read_block(struct w1_master *dev, u8 *buf, int len)
{
int i;
@@ -145,9 +233,15 @@
return ret;
}
+/**
+ * Issues a reset bus sequence.
+ *
+ * @param dev The bus master pointer
+ * @return 0=Device present, 1=No device present or error
+ */
int w1_reset_bus(struct w1_master *dev)
{
- int result = 0;
+ int result;
if (dev->bus_master->reset_bus)
result = dev->bus_master->reset_bus(dev->bus_master->data) & 0x1;
@@ -180,12 +274,11 @@
if (dev->bus_master->search)
dev->bus_master->search(dev->bus_master->data, cb);
else
- w1_search(dev);
+ w1_search(dev, cb);
}
-EXPORT_SYMBOL(w1_write_bit);
+EXPORT_SYMBOL(w1_touch_bit);
EXPORT_SYMBOL(w1_write_8);
-EXPORT_SYMBOL(w1_read_bit);
EXPORT_SYMBOL(w1_read_8);
EXPORT_SYMBOL(w1_reset_bus);
EXPORT_SYMBOL(w1_calc_crc8);
diff --git a/drivers/w1/w1_io.h b/drivers/w1/w1_io.h
index 6c57300..af58297 100644
--- a/drivers/w1/w1_io.h
+++ b/drivers/w1/w1_io.h
@@ -1,8 +1,8 @@
/*
- * w1_io.h
+ * w1_io.h
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -26,13 +26,12 @@
void w1_delay(unsigned long);
u8 w1_touch_bit(struct w1_master *, int);
-void w1_write_bit(struct w1_master *, int);
+u8 w1_triplet(struct w1_master *dev, int bdir);
void w1_write_8(struct w1_master *, u8);
-u8 w1_read_bit(struct w1_master *);
u8 w1_read_8(struct w1_master *);
int w1_reset_bus(struct w1_master *);
u8 w1_calc_crc8(u8 *, int);
-void w1_write_block(struct w1_master *, u8 *, int);
+void w1_write_block(struct w1_master *, const u8 *, int);
u8 w1_read_block(struct w1_master *, u8 *, int);
void w1_search_devices(struct w1_master *dev, w1_slave_found_callback cb);
diff --git a/drivers/w1/w1_log.h b/drivers/w1/w1_log.h
index a6bf6f4..fe6bdf4 100644
--- a/drivers/w1/w1_log.h
+++ b/drivers/w1/w1_log.h
@@ -1,8 +1,8 @@
/*
- * w1_log.h
+ * w1_log.h
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
diff --git a/drivers/w1/w1_netlink.h b/drivers/w1/w1_netlink.h
index ea1b530..8615756 100644
--- a/drivers/w1/w1_netlink.h
+++ b/drivers/w1/w1_netlink.h
@@ -33,13 +33,13 @@
W1_MASTER_REMOVE,
};
-struct w1_netlink_msg
+struct w1_netlink_msg
{
__u8 type;
__u8 reserved[3];
union
{
- struct w1_reg_num id;
+ struct w1_reg_num id;
__u64 w1_id;
struct
{
diff --git a/drivers/w1/w1_smem.c b/drivers/w1/w1_smem.c
index 674eb75..70d2d46 100644
--- a/drivers/w1/w1_smem.c
+++ b/drivers/w1/w1_smem.c
@@ -1,8 +1,8 @@
/*
- * w1_smem.c
+ * w1_smem.c
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the smems of the GNU General Public License as published by
@@ -37,14 +37,11 @@
MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, 64bit memory family.");
static ssize_t w1_smem_read_name(struct device *, struct device_attribute *attr, char *);
-static ssize_t w1_smem_read_val(struct device *, struct device_attribute *attr, char *);
static ssize_t w1_smem_read_bin(struct kobject *, char *, loff_t, size_t);
static struct w1_family_ops w1_smem_fops = {
.rname = &w1_smem_read_name,
.rbin = &w1_smem_read_bin,
- .rval = &w1_smem_read_val,
- .rvalname = "id",
};
static ssize_t w1_smem_read_name(struct device *dev, struct device_attribute *attr, char *buf)
@@ -54,23 +51,10 @@
return sprintf(buf, "%s\n", sl->name);
}
-static ssize_t w1_smem_read_val(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
- int i;
- ssize_t count = 0;
-
- for (i = 0; i < 8; ++i)
- count += sprintf(buf + count, "%02x ", ((u8 *)&sl->reg_num)[i]);
- count += sprintf(buf + count, "\n");
-
- return count;
-}
-
static ssize_t w1_smem_read_bin(struct kobject *kobj, char *buf, loff_t off, size_t count)
{
struct w1_slave *sl = container_of(container_of(kobj, struct device, kobj),
- struct w1_slave, dev);
+ struct w1_slave, dev);
int i;
atomic_inc(&sl->refcnt);
@@ -90,7 +74,7 @@
for (i = 0; i < 8; ++i)
count += sprintf(buf + count, "%02x ", ((u8 *)&sl->reg_num)[i]);
count += sprintf(buf + count, "\n");
-
+
out:
up(&sl->master->mutex);
out_dec:
@@ -99,19 +83,37 @@
return count;
}
-static struct w1_family w1_smem_family = {
- .fid = W1_FAMILY_SMEM,
+static struct w1_family w1_smem_family_01 = {
+ .fid = W1_FAMILY_SMEM_01,
+ .fops = &w1_smem_fops,
+};
+
+static struct w1_family w1_smem_family_81 = {
+ .fid = W1_FAMILY_SMEM_81,
.fops = &w1_smem_fops,
};
static int __init w1_smem_init(void)
{
- return w1_register_family(&w1_smem_family);
+ int err;
+
+ err = w1_register_family(&w1_smem_family_01);
+ if (err)
+ return err;
+
+ err = w1_register_family(&w1_smem_family_81);
+ if (err) {
+ w1_unregister_family(&w1_smem_family_01);
+ return err;
+ }
+
+ return 0;
}
static void __exit w1_smem_fini(void)
{
- w1_unregister_family(&w1_smem_family);
+ w1_unregister_family(&w1_smem_family_01);
+ w1_unregister_family(&w1_smem_family_81);
}
module_init(w1_smem_init);
diff --git a/drivers/w1/w1_therm.c b/drivers/w1/w1_therm.c
index 70310f7..165526c 100644
--- a/drivers/w1/w1_therm.c
+++ b/drivers/w1/w1_therm.c
@@ -1,8 +1,8 @@
/*
- * w1_therm.c
+ * w1_therm.c
*
* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
- *
+ *
*
* This program is free software; you can redistribute it and/or modify
* it under the therms of the GNU General Public License as published by
@@ -38,19 +38,56 @@
MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family.");
static u8 bad_roms[][9] = {
- {0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87},
+ {0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87},
{}
};
static ssize_t w1_therm_read_name(struct device *, struct device_attribute *attr, char *);
-static ssize_t w1_therm_read_temp(struct device *, struct device_attribute *attr, char *);
static ssize_t w1_therm_read_bin(struct kobject *, char *, loff_t, size_t);
static struct w1_family_ops w1_therm_fops = {
.rname = &w1_therm_read_name,
.rbin = &w1_therm_read_bin,
- .rval = &w1_therm_read_temp,
- .rvalname = "temp1_input",
+};
+
+static struct w1_family w1_therm_family_DS18S20 = {
+ .fid = W1_THERM_DS18S20,
+ .fops = &w1_therm_fops,
+};
+
+static struct w1_family w1_therm_family_DS18B20 = {
+ .fid = W1_THERM_DS18B20,
+ .fops = &w1_therm_fops,
+};
+static struct w1_family w1_therm_family_DS1822 = {
+ .fid = W1_THERM_DS1822,
+ .fops = &w1_therm_fops,
+};
+
+struct w1_therm_family_converter
+{
+ u8 broken;
+ u16 reserved;
+ struct w1_family *f;
+ int (*convert)(u8 rom[9]);
+};
+
+static inline int w1_DS18B20_convert_temp(u8 rom[9]);
+static inline int w1_DS18S20_convert_temp(u8 rom[9]);
+
+static struct w1_therm_family_converter w1_therm_families[] = {
+ {
+ .f = &w1_therm_family_DS18S20,
+ .convert = w1_DS18S20_convert_temp
+ },
+ {
+ .f = &w1_therm_family_DS1822,
+ .convert = w1_DS18B20_convert_temp
+ },
+ {
+ .f = &w1_therm_family_DS18B20,
+ .convert = w1_DS18B20_convert_temp
+ },
};
static ssize_t w1_therm_read_name(struct device *dev, struct device_attribute *attr, char *buf)
@@ -60,9 +97,19 @@
return sprintf(buf, "%s\n", sl->name);
}
-static inline int w1_convert_temp(u8 rom[9])
+static inline int w1_DS18B20_convert_temp(u8 rom[9])
+{
+ int t = (rom[1] << 8) | rom[0];
+ t /= 16;
+ return t;
+}
+
+static inline int w1_DS18S20_convert_temp(u8 rom[9])
{
int t, h;
+
+ if (!rom[7])
+ return 0;
if (rom[1] == 0)
t = ((s32)rom[0] >> 1)*1000;
@@ -77,11 +124,15 @@
return t;
}
-static ssize_t w1_therm_read_temp(struct device *dev, struct device_attribute *attr, char *buf)
+static inline int w1_convert_temp(u8 rom[9], u8 fid)
{
- struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+ int i;
- return sprintf(buf, "%d\n", w1_convert_temp(sl->rom));
+ for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i)
+ if (w1_therm_families[i].f->fid == fid)
+ return w1_therm_families[i].convert(rom);
+
+ return 0;
}
static int w1_therm_check_rom(u8 rom[9])
@@ -98,7 +149,7 @@
static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, size_t count)
{
struct w1_slave *sl = container_of(container_of(kobj, struct device, kobj),
- struct w1_slave, dev);
+ struct w1_slave, dev);
struct w1_master *dev = sl->master;
u8 rom[9], crc, verdict;
int i, max_trying = 10;
@@ -133,7 +184,7 @@
unsigned int tm = 750;
memcpy(&match[1], (u64 *) & sl->reg_num, 8);
-
+
w1_write_block(dev, match, 9);
w1_write_8(dev, W1_CONVERT_TEMP);
@@ -146,7 +197,7 @@
if (!w1_reset_bus (dev)) {
w1_write_block(dev, match, 9);
-
+
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);
@@ -176,7 +227,7 @@
for (i = 0; i < 9; ++i)
count += sprintf(buf + count, "%02x ", sl->rom[i]);
- count += sprintf(buf + count, "t=%d\n", w1_convert_temp(rom));
+ count += sprintf(buf + count, "t=%d\n", w1_convert_temp(rom, sl->family->fid));
out:
up(&dev->mutex);
out_dec:
@@ -186,19 +237,26 @@
return count;
}
-static struct w1_family w1_therm_family = {
- .fid = W1_FAMILY_THERM,
- .fops = &w1_therm_fops,
-};
-
static int __init w1_therm_init(void)
{
- return w1_register_family(&w1_therm_family);
+ int err, i;
+
+ for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i) {
+ err = w1_register_family(w1_therm_families[i].f);
+ if (err)
+ w1_therm_families[i].broken = 1;
+ }
+
+ return 0;
}
static void __exit w1_therm_fini(void)
{
- w1_unregister_family(&w1_therm_family);
+ int i;
+
+ for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i)
+ if (!w1_therm_families[i].broken)
+ w1_unregister_family(w1_therm_families[i].f);
}
module_init(w1_therm_init);