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Commit a0cd30fd authored by Linus Torvalds's avatar Linus Torvalds
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Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/w1-2.6

parents 94eb7f4c e5c515b4
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Documentation/w1/w1.generic
View file @ a0cd30fd
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
drivers/w1/Kconfig
View file @ a0cd30fd
......@@ -30,7 +30,7 @@ config W1_DS9490
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
......
drivers/w1/ds_w1_bridge.c
View file @ a0cd30fd
......@@ -83,11 +83,11 @@ static u8 ds9490r_read_byte(unsigned long data)
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)
......
drivers/w1/w1.c
View file @ a0cd30fd
......@@ -59,6 +59,19 @@ static pid_t control_thread;
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 @@ static ssize_t w1_default_read_bin(struct kobject *kobj, char *buf, loff_t off,
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,
......@@ -119,27 +146,9 @@ struct device w1_device = {
.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))
......@@ -152,6 +161,39 @@ static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_a
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;
}
static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
......@@ -216,7 +258,6 @@ static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct d
}
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;
......@@ -242,73 +283,52 @@ static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device
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;
......@@ -322,7 +342,7 @@ static int __w1_attach_slave_device(struct w1_slave *sl)
"%02x-%012llx",
(unsigned int) sl->reg_num.family,
(unsigned long long) sl->reg_num.id);
snprintf (&sl->name[0], sizeof(sl->name),
snprintf(&sl->name[0], sizeof(sl->name),
"%02x-%012llx",
(unsigned int) sl->reg_num.family,
(unsigned long long) sl->reg_num.id);
......@@ -340,12 +360,9 @@ static int __w1_attach_slave_device(struct w1_slave *sl)
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) {
......@@ -356,26 +373,17 @@ static int __w1_attach_slave_device(struct w1_slave *sl)
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;
}
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_remove_file(&sl->dev, &sl->attr_val);
device_unregister(&sl->dev);
return err;
}
}
list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
......@@ -410,12 +418,10 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
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);
......@@ -456,12 +462,15 @@ static void w1_slave_detach(struct w1_slave *sl)
flush_signals(current);
}
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);
......@@ -472,7 +481,7 @@ static struct w1_master *w1_search_master(unsigned long data)
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 @@ static struct w1_master *w1_search_master(unsigned long data)
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;
......@@ -513,8 +536,7 @@ void w1_slave_found(unsigned long data, u64 rn)
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;
}
......@@ -532,26 +554,39 @@ void w1_slave_found(unsigned long data, u64 rn)
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 @@ void w1_search(struct w1_master *dev)
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);
if (id_bit && comp_bit)
break;
if (id_bit == 0 && comp_bit == 0) {
/* Determine the direction/search bit */
if (i == desc_bit)
search_bit = 1;
search_bit = 1; /* took the 0 path last time, so take the 1 path */
else if (i > desc_bit)
search_bit = 0;
search_bit = 0; /* take the 0 path on the next branch */
else
search_bit = ((last >> i) & 0x1);
if (search_bit == 0) {
last_zero = i;
if (last_zero < 9)
last_family_desc = last_zero;
}
search_bit = ((last_rn >> i) & 0x1);
}
else
search_bit = id_bit;
/** Read two bits and write one bit */
triplet_ret = w1_triplet(dev, search_bit);
tmp = search_bit;
rn |= (tmp << i);
/* quit if no device responded */
if ( (triplet_ret & 0x03) == 0x03 )
break;
/*
* 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);
/* If both directions were valid, and we took the 0 path... */
if (triplet_ret == 0)
last_zero = i;
/* extract the direction taken & update the device number */
tmp64 = (triplet_ret >> 2);
rn |= (tmp64 << i);
}
#endif
if (desc_bit == last_zero)
if ( (triplet_ret & 0x03) != 0x03 ) {
if ( (desc_bit == last_zero) || (last_zero < 0))
last_device = 1;
desc_bit = last_zero;
w1_slave_found(dev->bus_master->data, rn);
cb(dev->bus_master->data, rn);
}
}
}
int w1_create_master_attributes(struct w1_master *dev)
{
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)
static 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 @@ int w1_control(void *data)
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 @@ int w1_control(void *data)
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 @@ int w1_control(void *data)
dev->kpid);
}
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;
}
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_control(void *data)
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 (down_interruptible(&dev->mutex))
if (dev->search_count == 0)
continue;
list_for_each_safe(ent, n, &dev->slist) {
sl = list_entry(ent, struct w1_slave, w1_slave_entry);
if (down_interruptible(&dev->mutex))
continue;
if (sl)
list_for_each_entry(sl, &dev->slist, w1_slave_entry)
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 @@ int w1_process(void *data)
return 0;
}
int w1_init(void)
static int w1_init(void)
{
int retval;
......@@ -814,18 +812,14 @@ int w1_init(void)
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);
......
drivers/w1/w1.h
View file @ a0cd30fd
......@@ -79,31 +79,81 @@ struct w1_slave
struct completion dev_released;
struct bin_attribute attr_bin;
struct device_attribute attr_name, attr_val;
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
{
/** the first parameter in all the functions below */
unsigned long data;
/**
* Sample the line level
* @return the level read (0 or 1)
*/
u8 (*read_bit)(unsigned long);
/** 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);
void (*write_block)(unsigned long, u8 *, int);
u8 (*touch_bit)(unsigned long, u8);
/** 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;
......@@ -115,13 +165,15 @@ struct w1_master
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;
......@@ -137,8 +189,7 @@ struct w1_master
};
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__ */
......
drivers/w1/w1_family.c
View file @ a0cd30fd
......@@ -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 @@ int w1_register_family(struct w1_family *newf)
newf->need_exit = 0;
list_add_tail(&newf->family_entry, &w1_families);
}
spin_unlock(&w1_flock);
w1_reconnect_slaves(newf);
return ret;
}
......
drivers/w1/w1_family.h
View file @ a0cd30fd
......@@ -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
......@@ -36,9 +39,6 @@ struct w1_family_ops
{
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
......
drivers/w1/w1_int.c
View file @ a0cd30fd
......@@ -39,8 +39,9 @@ extern spinlock_t w1_mlock;
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;
......@@ -68,6 +69,7 @@ struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
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 @@ struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
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 w1_add_master_device(struct w1_bus_master *master)
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 @@ int w1_add_master_device(struct w1_bus_master *master)
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 @@ void __w1_remove_master_device(struct w1_master *dev)
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_master *dev)
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;
......
drivers/w1/w1_int.h
View file @ a0cd30fd
......@@ -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 *);
......
drivers/w1/w1_io.c
View file @ a0cd30fd
......@@ -55,15 +55,29 @@ void w1_delay(unsigned long tm)
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 @@ void w1_write_bit(struct w1_master *dev, int bit)
}
}
/**
* 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 @@ void w1_write_8(struct w1_master *dev, u8 byte)
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 @@ u8 w1_read_bit(struct w1_master *dev)
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 @@ u8 w1_read_8(struct w1_master * dev)
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 @@ void w1_write_block(struct w1_master *dev, u8 *buf, int len)
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 @@ u8 w1_read_block(struct w1_master *dev, u8 *buf, int len)
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 @@ void w1_search_devices(struct w1_master *dev, w1_slave_found_callback cb)
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);
......
drivers/w1/w1_io.h
View file @ a0cd30fd
......@@ -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);
......
drivers/w1/w1_smem.c
View file @ a0cd30fd
......@@ -37,14 +37,11 @@ MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
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)
......@@ -54,19 +51,6 @@ static ssize_t w1_smem_read_name(struct device *dev, struct device_attribute *at
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),
......@@ -99,19 +83,37 @@ static ssize_t w1_smem_read_bin(struct kobject *kobj, char *buf, loff_t off, siz
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);
......
drivers/w1/w1_therm.c
View file @ a0cd30fd
......@@ -43,14 +43,51 @@ static u8 bad_roms[][9] = {
};
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)
......@@ -60,10 +97,20 @@ static ssize_t w1_therm_read_name(struct device *dev, struct device_attribute *a
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;
else
......@@ -77,11 +124,15 @@ static inline int w1_convert_temp(u8 rom[9])
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;
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 sprintf(buf, "%d\n", w1_convert_temp(sl->rom));
return 0;
}
static int w1_therm_check_rom(u8 rom[9])
......@@ -176,7 +227,7 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si
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 @@ static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, si
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);
......
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