[PATCH 3/14] [PATCH] w1: Userspace communication protocol over connector.

From: Greg KH
Date: Thu Jun 22 2006 - 14:35:04 EST

From: Evgeniy Polyakov <johnpol@xxxxxxxxxxx>

There are three types of messages between w1 core and userspace:
1. Events. They are generated each time new master or slave device found
either due to automatic or requested search.
2. Userspace commands. Includes read/write and search/alarm search comamnds.
3. Replies to userspace commands.

From: Evgeniy Polyakov <johnpol@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
Documentation/w1/w1.netlink | 98 +++++++++++++++++++
drivers/w1/Makefile | 2
drivers/w1/slaves/w1_ds2433.c | 1
drivers/w1/slaves/w1_smem.c | 1
drivers/w1/slaves/w1_therm.c | 1
drivers/w1/w1.c | 137 ++++++++++++++++++--------
drivers/w1/w1.h | 38 ++++---
drivers/w1/w1_family.h | 1
drivers/w1/w1_int.c | 27 +++--
drivers/w1/w1_io.c | 18 +--
drivers/w1/w1_netlink.c | 215 +++++++++++++++++++++++++++++++++++------
drivers/w1/w1_netlink.h | 38 +++++--
12 files changed, 445 insertions(+), 132 deletions(-)

diff --git a/Documentation/w1/w1.netlink b/Documentation/w1/w1.netlink
new file mode 100644
index 0000000..3640c7c
--- /dev/null
+++ b/Documentation/w1/w1.netlink
@@ -0,0 +1,98 @@
+Userspace communication protocol over connector [1].
+
+
+Message types.
+=============
+
+There are three types of messages between w1 core and userspace:
+1. Events. They are generated each time new master or slave device found
+ either due to automatic or requested search.
+2. Userspace commands. Includes read/write and search/alarm search comamnds.
+3. Replies to userspace commands.
+
+
+Protocol.
+========
+
+[struct cn_msg] - connector header. It's length field is equal to size of the attached data.
+[struct w1_netlink_msg] - w1 netlink header.
+ __u8 type - message type.
+ W1_SLAVE_ADD/W1_SLAVE_REMOVE - slave add/remove events.
+ W1_MASTER_ADD/W1_MASTER_REMOVE - master add/remove events.
+ W1_MASTER_CMD - userspace command for bus master device (search/alarm search).
+ W1_SLAVE_CMD - userspace command for slave device (read/write/ search/alarm search
+ for bus master device where given slave device found).
+ __u8 res - reserved
+ __u16 len - size of attached to this header data.
+ union {
+ __u8 id; - slave unique device id
+ struct w1_mst {
+ __u32 id; - master's id.
+ __u32 res; - reserved
+ } mst;
+ } id;
+
+[strucrt w1_netlink_cmd] - command for gived master or slave device.
+ __u8 cmd - command opcode.
+ W1_CMD_READ - read command.
+ W1_CMD_WRITE - write command.
+ W1_CMD_SEARCH - search command.
+ W1_CMD_ALARM_SEARCH - alarm search command.
+ __u8 res - reserved
+ __u16 len - length of data for this command.
+ For read command data must be allocated like for write command.
+ __u8 data[0] - data for this command.
+
+
+Each connector message can include one or more w1_netlink_msg with zero of more attached w1_netlink_cmd messages.
+
+For event messages there are no w1_netlink_cmd embedded structures, only connector header
+and w1_netlink_msg strucutre with "len" field being zero and filled type (one of event types)
+and id - either 8 bytes of slave unique id in host order, or master's id, which is assigned
+to bus master device when it is added to w1 core.
+
+Currently replies to userspace commands are only generated for read command request.
+One reply is generated exactly for one w1_netlink_cmd read request.
+Replies are not combined when sent - i.e. typical reply messages looks like the following:
+[cn_msg][w1_netlink_msg][w1_netlink_cmd]
+cn_msg.len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd) + cmd->len;
+w1_netlink_msg.len = sizeof(struct w1_netlink_cmd) + cmd->len;
+w1_netlink_cmd.len = cmd->len;
+
+
+Operation steps in w1 core when new command is received.
+=======================================================
+
+When new message (w1_netlink_msg) is received w1 core detects if it is master of slave request,
+according to w1_netlink_msg.type field.
+Then master or slave device is searched for.
+When found, master device (requested or those one on where slave device is found) is locked.
+If slave command is requested, then reset/select procedure is started to select given device.
+
+Then all requested in w1_netlink_msg operations are performed one by one.
+If command requires reply (like read command) it is sent on command completion.
+
+When all commands (w1_netlink_cmd) are processed muster device is unlocked
+and next w1_netlink_msg header processing started.
+
+
+Connector [1] specific documentation.
+====================================
+
+Each connector message includes two u32 fields as "address".
+w1 uses CN_W1_IDX and CN_W1_VAL defined in include/linux/connector.h header.
+Each message also includes sequence and acknowledge numbers.
+Sequence number for event messages is appropriate bus master sequence number increased with
+each event message sent "through" this master.
+Sequence number for userspace requests is set by userspace application.
+Sequence number for reply is the same as was in request, and
+acknowledge number is set to seq+1.
+
+
+Additional documantion, source code examples.
+============================================
+
+1. Documentation/connector
+2. http://tservice.net.ru/~s0mbre/archive/w1
+This archive includes userspace application w1d.c which
+uses read/write/search commands for all master/slave devices found on the bus.
diff --git a/drivers/w1/Makefile b/drivers/w1/Makefile
index 0c2aa22..f0465c2 100644
--- a/drivers/w1/Makefile
+++ b/drivers/w1/Makefile
@@ -2,7 +2,7 @@ #
# Makefile for the Dallas's 1-wire bus.
#

-ifneq ($(CONFIG_NET), y)
+ifeq ($(CONFIG_CONNECTOR), n)
EXTRA_CFLAGS += -DNETLINK_DISABLED
endif

diff --git a/drivers/w1/slaves/w1_ds2433.c b/drivers/w1/slaves/w1_ds2433.c
index fb118be..ddd01e6 100644
--- a/drivers/w1/slaves/w1_ds2433.c
+++ b/drivers/w1/slaves/w1_ds2433.c
@@ -22,7 +22,6 @@ #define CRC16_VALID 0xb001
#endif

#include "../w1.h"
-#include "../w1_io.h"
#include "../w1_int.h"
#include "../w1_family.h"

diff --git a/drivers/w1/slaves/w1_smem.c b/drivers/w1/slaves/w1_smem.c
index c6d3be5..cc8c02e 100644
--- a/drivers/w1/slaves/w1_smem.c
+++ b/drivers/w1/slaves/w1_smem.c
@@ -28,7 +28,6 @@ #include <linux/device.h>
#include <linux/types.h>

#include "../w1.h"
-#include "../w1_io.h"
#include "../w1_int.h"
#include "../w1_family.h"

diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index 536d16d..44afdff 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -29,7 +29,6 @@ #include <linux/types.h>
#include <linux/delay.h>

#include "../w1.h"
-#include "../w1_io.h"
#include "../w1_int.h"
#include "../w1_family.h"

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index c9486c1..32d8de8 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -35,7 +35,6 @@ #include <linux/kthread.h>
#include <asm/atomic.h>

#include "w1.h"
-#include "w1_io.h"
#include "w1_log.h"
#include "w1_int.h"
#include "w1_family.h"
@@ -55,7 +54,7 @@ module_param_named(control_timeout, w1_c
module_param_named(max_slave_count, w1_max_slave_count, int, 0);
module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);

-DEFINE_SPINLOCK(w1_mlock);
+DECLARE_MUTEX(w1_mlock);
LIST_HEAD(w1_masters);

static struct task_struct *w1_control_thread;
@@ -75,8 +74,6 @@ static void w1_master_release(struct dev
struct w1_master *md = dev_to_w1_master(dev);

dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
-
- dev_fini_netlink(md);
memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
kfree(md);
}
@@ -85,10 +82,10 @@ static void w1_slave_release(struct devi
{
struct w1_slave *sl = dev_to_w1_slave(dev);

- dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name);
+ printk("%s: Releasing %s.\n", __func__, sl->name);

while (atomic_read(&sl->refcnt)) {
- dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n",
+ printk("Waiting for %s to become free: refcnt=%d.\n",
sl->name, atomic_read(&sl->refcnt));
if (msleep_interruptible(1000))
flush_signals(current);
@@ -111,7 +108,6 @@ static ssize_t w1_slave_read_id(struct k
{
struct w1_slave *sl = kobj_to_w1_slave(kobj);

- atomic_inc(&sl->refcnt);
if (off > 8) {
count = 0;
} else {
@@ -120,7 +116,6 @@ static ssize_t w1_slave_read_id(struct k

memcpy(buf, (u8 *)&sl->reg_num, count);
}
- atomic_dec(&sl->refcnt);

return count;
}
@@ -230,12 +225,11 @@ struct device w1_master_device = {
.release = &w1_master_release
};

-static struct device_driver w1_slave_driver = {
+struct device_driver w1_slave_driver = {
.name = "w1_slave_driver",
.bus = &w1_bus_type,
};

-#if 0
struct device w1_slave_device = {
.parent = NULL,
.bus = &w1_bus_type,
@@ -243,7 +237,6 @@ struct device w1_slave_device = {
.driver = &w1_slave_driver,
.release = &w1_slave_release
};
-#endif /* 0 */

static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
{
@@ -423,7 +416,7 @@ int w1_create_master_attributes(struct w
return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
}

-static void w1_destroy_master_attributes(struct w1_master *master)
+void w1_destroy_master_attributes(struct w1_master *master)
{
sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
}
@@ -454,14 +447,11 @@ static int w1_uevent(struct device *dev,
if (dev->driver != &w1_slave_driver || !sl)
return 0;

- err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
- &cur_len, "W1_FID=%02X", sl->reg_num.family);
+ err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_FID=%02X", sl->reg_num.family);
if (err)
return err;

- err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
- &cur_len, "W1_SLAVE_ID=%024LX",
- (unsigned long long)sl->reg_num.id);
+ err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_SLAVE_ID=%024LX", (u64)sl->reg_num.id);
if (err)
return err;

@@ -563,6 +553,7 @@ static int w1_attach_slave_device(struct
sl->master = dev;
set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);

+ memset(&msg, 0, sizeof(msg));
memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
atomic_set(&sl->refcnt, 0);
init_completion(&sl->released);
@@ -593,7 +584,7 @@ static int w1_attach_slave_device(struct
sl->ttl = dev->slave_ttl;
dev->slave_count++;

- memcpy(&msg.id.id, rn, sizeof(msg.id.id));
+ memcpy(msg.id.id, rn, sizeof(msg.id));
msg.type = W1_SLAVE_ADD;
w1_netlink_send(dev, &msg);

@@ -611,7 +602,8 @@ static void w1_slave_detach(struct w1_sl
if (sl->family->fops && sl->family->fops->remove_slave)
sl->family->fops->remove_slave(sl);

- memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id));
+ memset(&msg, 0, sizeof(msg));
+ memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id));
msg.type = W1_SLAVE_REMOVE;
w1_netlink_send(sl->master, &msg);

@@ -628,7 +620,7 @@ static struct w1_master *w1_search_maste
struct w1_master *dev;
int found = 0;

- spin_lock_bh(&w1_mlock);
+ down(&w1_mlock);
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
if (dev->bus_master->data == data) {
found = 1;
@@ -636,22 +628,69 @@ static struct w1_master *w1_search_maste
break;
}
}
- spin_unlock_bh(&w1_mlock);
+ up(&w1_mlock);

return (found)?dev:NULL;
}

+struct w1_master *w1_search_master_id(u32 id)
+{
+ struct w1_master *dev;
+ int found = 0;
+
+ down(&w1_mlock);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry) {
+ if (dev->id == id) {
+ found = 1;
+ atomic_inc(&dev->refcnt);
+ break;
+ }
+ }
+ up(&w1_mlock);
+
+ return (found)?dev:NULL;
+}
+
+struct w1_slave *w1_search_slave(struct w1_reg_num *id)
+{
+ struct w1_master *dev;
+ struct w1_slave *sl = NULL;
+ int found = 0;
+
+ down(&w1_mlock);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry) {
+ down(&dev->mutex);
+ list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
+ if (sl->reg_num.family == id->family &&
+ sl->reg_num.id == id->id &&
+ sl->reg_num.crc == id->crc) {
+ found = 1;
+ atomic_inc(&dev->refcnt);
+ atomic_inc(&sl->refcnt);
+ break;
+ }
+ }
+ up(&dev->mutex);
+
+ if (found)
+ break;
+ }
+ up(&w1_mlock);
+
+ return (found)?sl:NULL;
+}
+
void w1_reconnect_slaves(struct w1_family *f)
{
struct w1_master *dev;

- spin_lock_bh(&w1_mlock);
+ down(&w1_mlock);
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
dev_dbg(&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);
+ up(&w1_mlock);
}

static void w1_slave_found(void *data, u64 rn)
@@ -713,7 +752,7 @@ static void w1_slave_found(void *data, u
* @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)
+void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
{
u64 last_rn, rn, tmp64;
int i, slave_count = 0;
@@ -744,7 +783,7 @@ void w1_search(struct w1_master *dev, w1
}

/* Start the search */
- w1_write_8(dev, W1_SEARCH);
+ w1_write_8(dev, search_type);
for (i = 0; i < 64; ++i) {
/* Determine the direction/search bit */
if (i == desc_bit)
@@ -806,9 +845,9 @@ static int w1_control(void *data)
if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
set_bit(W1_MASTER_NEED_EXIT, &dev->flags);

- spin_lock(&w1_mlock);
+ down(&w1_mlock);
list_del(&dev->w1_master_entry);
- spin_unlock(&w1_mlock);
+ up(&w1_mlock);

down(&dev->mutex);
list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
@@ -843,10 +882,31 @@ static int w1_control(void *data)
return 0;
}

+void w1_search_process(struct w1_master *dev, u8 search_type)
+{
+ struct w1_slave *sl, *sln;
+
+ list_for_each_entry(sl, &dev->slist, w1_slave_entry)
+ clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
+
+ w1_search_devices(dev, search_type, w1_slave_found);
+
+ list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
+ if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
+ w1_slave_detach(sl);
+
+ dev->slave_count--;
+ } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
+ sl->ttl = dev->slave_ttl;
+ }
+
+ if (dev->search_count > 0)
+ dev->search_count--;
+}
+
int w1_process(void *data)
{
struct w1_master *dev = (struct w1_master *) data;
- struct w1_slave *sl, *sln;

while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
try_to_freeze();
@@ -864,22 +924,7 @@ int w1_process(void *data)
if (down_interruptible(&dev->mutex))
continue;

- 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_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
- if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
- w1_slave_detach(sl);
-
- dev->slave_count--;
- } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
- sl->ttl = dev->slave_ttl;
- }
-
- if (dev->search_count > 0)
- dev->search_count--;
+ w1_search_process(dev, W1_SEARCH);

up(&dev->mutex);
}
@@ -895,6 +940,8 @@ static int w1_init(void)

printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n");

+ w1_init_netlink();
+
retval = bus_register(&w1_bus_type);
if (retval) {
printk(KERN_ERR "Failed to register bus. err=%d.\n", retval);
@@ -947,6 +994,8 @@ static void w1_fini(void)
list_for_each_entry(dev, &w1_masters, w1_master_entry)
__w1_remove_master_device(dev);

+ w1_fini_netlink();
+
kthread_stop(w1_control_thread);

driver_unregister(&w1_slave_driver);
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index 02e8cad..e8c96e6 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -42,8 +42,6 @@ #ifdef __KERNEL__
#include <linux/completion.h>
#include <linux/device.h>

-#include <net/sock.h>
-
#include <asm/semaphore.h>

#include "w1_family.h"
@@ -52,7 +50,7 @@ #define W1_MAXNAMELEN 32
#define W1_SLAVE_DATA_SIZE 128

#define W1_SEARCH 0xF0
-#define W1_CONDITIONAL_SEARCH 0xEC
+#define W1_ALARM_SEARCH 0xEC
#define W1_CONVERT_TEMP 0x44
#define W1_SKIP_ROM 0xCC
#define W1_READ_SCRATCHPAD 0xBE
@@ -145,8 +143,8 @@ struct w1_bus_master
*/
u8 (*reset_bus)(void *);

- /** Really nice hardware can handles the ROM searches */
- void (*search)(void *, w1_slave_found_callback);
+ /** Really nice hardware can handles the different types of ROM search */
+ void (*search)(void *, u8, w1_slave_found_callback);
};

#define W1_MASTER_NEED_EXIT 0
@@ -180,12 +178,26 @@ struct w1_master

struct w1_bus_master *bus_master;

- u32 seq, groups;
- struct sock *nls;
+ u32 seq;
};

int w1_create_master_attributes(struct w1_master *);
-void w1_search(struct w1_master *dev, w1_slave_found_callback cb);
+void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
+void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
+struct w1_slave *w1_search_slave(struct w1_reg_num *id);
+void w1_search_process(struct w1_master *dev, u8 search_type);
+struct w1_master *w1_search_master_id(u32 id);
+
+void w1_delay(unsigned long);
+u8 w1_touch_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_8(struct w1_master *);
+int w1_reset_bus(struct w1_master *);
+u8 w1_calc_crc8(u8 *, int);
+void w1_write_block(struct w1_master *, const u8 *, int);
+u8 w1_read_block(struct w1_master *, u8 *, int);
+int w1_reset_select_slave(struct w1_slave *sl);

static inline struct w1_slave* dev_to_w1_slave(struct device *dev)
{
@@ -202,16 +214,6 @@ static inline struct w1_master* dev_to_w
return container_of(dev, struct w1_master, dev);
}

-extern int w1_max_slave_count;
-extern int w1_max_slave_ttl;
-extern spinlock_t w1_mlock;
-extern struct list_head w1_masters;
-extern struct device_driver w1_master_driver;
-extern struct device w1_master_device;
-
-int w1_process(void *data);
-void w1_reconnect_slaves(struct w1_family *f);
-
#endif /* __KERNEL__ */

#endif /* __W1_H */
diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h
index 2ca0489..22a9d52 100644
--- a/drivers/w1/w1_family.h
+++ b/drivers/w1/w1_family.h
@@ -64,5 +64,6 @@ void __w1_family_put(struct w1_family *)
struct w1_family * w1_family_registered(u8);
void w1_unregister_family(struct w1_family *);
int w1_register_family(struct w1_family *);
+void w1_reconnect_slaves(struct w1_family *f);

#endif /* __W1_FAMILY_H */
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
index 68565aa..ae78473 100644
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -27,10 +27,19 @@ #include <linux/kthread.h>
#include "w1.h"
#include "w1_log.h"
#include "w1_netlink.h"
-#include "w1_int.h"

static u32 w1_ids = 1;

+extern struct device_driver w1_master_driver;
+extern struct bus_type w1_bus_type;
+extern struct device w1_master_device;
+extern int w1_max_slave_count;
+extern int w1_max_slave_ttl;
+extern struct list_head w1_masters;
+extern struct semaphore w1_mlock;
+
+extern int w1_process(void *);
+
static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
struct device_driver *driver,
struct device *device)
@@ -74,16 +83,11 @@ static struct w1_master * w1_alloc_dev(u

dev->driver = driver;

- dev->groups = 1;
dev->seq = 1;
- dev_init_netlink(dev);

err = device_register(&dev->dev);
if (err) {
printk(KERN_ERR "Failed to register master device. err=%d\n", err);
-
- dev_fini_netlink(dev);
-
memset(dev, 0, sizeof(struct w1_master));
kfree(dev);
dev = NULL;
@@ -92,7 +96,7 @@ static struct w1_master * w1_alloc_dev(u
return dev;
}

-static void w1_free_dev(struct w1_master *dev)
+void w1_free_dev(struct w1_master *dev)
{
device_unregister(&dev->dev);
}
@@ -131,12 +135,12 @@ int w1_add_master_device(struct w1_bus_m

dev->initialized = 1;

- spin_lock(&w1_mlock);
+ down(&w1_mlock);
list_add(&dev->w1_master_entry, &w1_masters);
- spin_unlock(&w1_mlock);
+ up(&w1_mlock);

+ memset(&msg, 0, sizeof(msg));
msg.id.mst.id = dev->id;
- msg.id.mst.pid = dev->thread->pid;
msg.type = W1_MASTER_ADD;
w1_netlink_send(dev, &msg);

@@ -153,7 +157,6 @@ err_out_free_dev:
void __w1_remove_master_device(struct w1_master *dev)
{
struct w1_netlink_msg msg;
- pid_t pid = dev->thread->pid;

set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
kthread_stop(dev->thread);
@@ -166,8 +169,8 @@ void __w1_remove_master_device(struct w1
flush_signals(current);
}

+ memset(&msg, 0, sizeof(msg));
msg.id.mst.id = dev->id;
- msg.id.mst.pid = pid;
msg.type = W1_MASTER_REMOVE;
w1_netlink_send(dev, &msg);

diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c
index f7f7e8b..a6eb9db 100644
--- a/drivers/w1/w1_io.c
+++ b/drivers/w1/w1_io.c
@@ -26,7 +26,6 @@ #include <linux/moduleparam.h>

#include "w1.h"
#include "w1_log.h"
-#include "w1_io.h"

static int w1_delay_parm = 1;
module_param_named(delay_coef, w1_delay_parm, int, 0);
@@ -268,13 +267,13 @@ u8 w1_calc_crc8(u8 * data, int len)
return crc;
}

-void w1_search_devices(struct w1_master *dev, w1_slave_found_callback cb)
+void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
{
dev->attempts++;
if (dev->bus_master->search)
- dev->bus_master->search(dev->bus_master->data, cb);
+ dev->bus_master->search(dev->bus_master->data, search_type, cb);
else
- w1_search(dev, cb);
+ w1_search(dev, search_type, cb);
}

/**
@@ -300,13 +299,4 @@ int w1_reset_select_slave(struct w1_slav
return 0;
}

-EXPORT_SYMBOL(w1_touch_bit);
-EXPORT_SYMBOL(w1_write_8);
-EXPORT_SYMBOL(w1_read_8);
-EXPORT_SYMBOL(w1_reset_bus);
-EXPORT_SYMBOL(w1_calc_crc8);
-EXPORT_SYMBOL(w1_delay);
-EXPORT_SYMBOL(w1_read_block);
-EXPORT_SYMBOL(w1_write_block);
-EXPORT_SYMBOL(w1_search_devices);
-EXPORT_SYMBOL(w1_reset_select_slave);
+EXPORT_SYMBOL_GPL(w1_calc_crc8);
diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c
index 328645d..d48f3ac 100644
--- a/drivers/w1/w1_netlink.c
+++ b/drivers/w1/w1_netlink.c
@@ -21,6 +21,7 @@

#include <linux/skbuff.h>
#include <linux/netlink.h>
+#include <linux/connector.h>

#include "w1.h"
#include "w1_log.h"
@@ -29,50 +30,204 @@ #include "w1_netlink.h"
#ifndef NETLINK_DISABLED
void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
{
- unsigned int size;
- struct sk_buff *skb;
- struct w1_netlink_msg *data;
- struct nlmsghdr *nlh;
+ char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)];
+ struct cn_msg *m = (struct cn_msg *)buf;
+ struct w1_netlink_msg *w = (struct w1_netlink_msg *)(m+1);

- if (!dev->nls)
- return;
+ memset(buf, 0, sizeof(buf));

- size = NLMSG_SPACE(sizeof(struct w1_netlink_msg));
+ m->id.idx = CN_W1_IDX;
+ m->id.val = CN_W1_VAL;

- skb = alloc_skb(size, GFP_ATOMIC);
- if (!skb) {
- dev_err(&dev->dev, "skb_alloc() failed.\n");
- return;
- }
+ m->seq = dev->seq++;
+ m->len = sizeof(struct w1_netlink_msg);

- nlh = NLMSG_PUT(skb, 0, dev->seq++, NLMSG_DONE, size - sizeof(*nlh));
+ memcpy(w, msg, sizeof(struct w1_netlink_msg));

- data = (struct w1_netlink_msg *)NLMSG_DATA(nlh);
+ cn_netlink_send(m, 0, GFP_KERNEL);
+}

- memcpy(data, msg, sizeof(struct w1_netlink_msg));
+static int w1_process_command_master(struct w1_master *dev, struct cn_msg *msg,
+ struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
+{
+ dev_dbg(&dev->dev, "%s: %s: cmd=%02x, len=%u.\n",
+ __func__, dev->name, cmd->cmd, cmd->len);

- NETLINK_CB(skb).dst_group = dev->groups;
- netlink_broadcast(dev->nls, skb, 0, dev->groups, GFP_ATOMIC);
+ if (cmd->cmd != W1_CMD_SEARCH && cmd->cmd != W1_CMD_ALARM_SEARCH)
+ return -EINVAL;

-nlmsg_failure:
- return;
+ w1_search_process(dev, (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH);
+ return 0;
}

-int dev_init_netlink(struct w1_master *dev)
+static int w1_send_read_reply(struct w1_slave *sl, struct cn_msg *msg,
+ struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
{
- dev->nls = netlink_kernel_create(NETLINK_W1, 1, NULL, THIS_MODULE);
- if (!dev->nls) {
- printk(KERN_ERR "Failed to create new netlink socket(%u) for w1 master %s.\n",
- NETLINK_W1, dev->dev.bus_id);
+ void *data;
+ struct w1_netlink_msg *h;
+ struct w1_netlink_cmd *c;
+ struct cn_msg *cm;
+ int err;
+
+ data = kzalloc(sizeof(struct cn_msg) +
+ sizeof(struct w1_netlink_msg) +
+ sizeof(struct w1_netlink_cmd) +
+ cmd->len, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ cm = (struct cn_msg *)(data);
+ h = (struct w1_netlink_msg *)(cm + 1);
+ c = (struct w1_netlink_cmd *)(h + 1);
+
+ memcpy(cm, msg, sizeof(struct cn_msg));
+ memcpy(h, hdr, sizeof(struct w1_netlink_msg));
+ memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
+
+ cm->ack = msg->seq+1;
+ cm->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd) + cmd->len;
+
+ h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
+
+ memcpy(c->data, cmd->data, c->len);
+
+ err = cn_netlink_send(cm, 0, GFP_KERNEL);
+
+ kfree(data);
+
+ return err;
+}
+
+static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
+ struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
+{
+ int err = 0;
+
+ dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
+ __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id, sl->reg_num.crc,
+ cmd->cmd, cmd->len);
+
+ switch (cmd->cmd) {
+ case W1_CMD_READ:
+ w1_read_block(sl->master, cmd->data, cmd->len);
+ w1_send_read_reply(sl, msg, hdr, cmd);
+ break;
+ case W1_CMD_WRITE:
+ w1_write_block(sl->master, cmd->data, cmd->len);
+ break;
+ case W1_CMD_SEARCH:
+ case W1_CMD_ALARM_SEARCH:
+ w1_search_process(sl->master,
+ (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH);
+ break;
+ default:
+ err = -1;
+ break;
}

- return 0;
+ return err;
+}
+
+static void w1_cn_callback(void *data)
+{
+ struct cn_msg *msg = data;
+ struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);
+ struct w1_netlink_cmd *cmd;
+ struct w1_slave *sl;
+ struct w1_master *dev;
+ int err = 0;
+
+ while (msg->len && !err) {
+ struct w1_reg_num id;
+ u16 mlen = m->len;
+ u8 *cmd_data = m->data;
+
+ dev = NULL;
+ sl = NULL;
+
+ memcpy(&id, m->id.id, sizeof(id));
+#if 0
+ printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
+ __func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
+#endif
+ if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
+ err = -E2BIG;
+ break;
+ }
+
+ if (!mlen)
+ goto out_cont;
+
+ if (m->type == W1_MASTER_CMD) {
+ dev = w1_search_master_id(m->id.mst.id);
+ } else if (m->type == W1_SLAVE_CMD) {
+ sl = w1_search_slave(&id);
+ if (sl)
+ dev = sl->master;
+ }
+
+ if (!dev) {
+ err = -ENODEV;
+ goto out_cont;
+ }
+
+ down(&dev->mutex);
+
+ if (sl && w1_reset_select_slave(sl)) {
+ err = -ENODEV;
+ goto out_up;
+ }
+
+ while (mlen) {
+ cmd = (struct w1_netlink_cmd *)cmd_data;
+
+ if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
+ err = -E2BIG;
+ break;
+ }
+
+ if (sl)
+ w1_process_command_slave(sl, msg, m, cmd);
+ else
+ w1_process_command_master(dev, msg, m, cmd);
+
+ cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
+ mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
+ }
+out_up:
+ atomic_dec(&dev->refcnt);
+ if (sl)
+ atomic_dec(&sl->refcnt);
+ up(&dev->mutex);
+out_cont:
+ msg->len -= sizeof(struct w1_netlink_msg) + m->len;
+ m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len);
+
+ /*
+ * Let's allow requests for nonexisting devices.
+ */
+ if (err == -ENODEV)
+ err = 0;
+ }
+#if 0
+ if (err) {
+ printk("%s: malformed message. Dropping.\n", __func__);
+ }
+#endif
}

-void dev_fini_netlink(struct w1_master *dev)
+int w1_init_netlink(void)
{
- if (dev->nls && dev->nls->sk_socket)
- sock_release(dev->nls->sk_socket);
+ struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
+
+ return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
+}
+
+void w1_fini_netlink(void)
+{
+ struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
+
+ cn_del_callback(&w1_id);
}
#else
#warning Netlink support is disabled. Please compile with NET support enabled.
@@ -81,12 +236,12 @@ void w1_netlink_send(struct w1_master *d
{
}

-int dev_init_netlink(struct w1_master *dev)
+int w1_init_netlink(void)
{
return 0;
}

-void dev_fini_netlink(struct w1_master *dev)
+void w1_fini_netlink(void)
{
}
#endif
diff --git a/drivers/w1/w1_netlink.h b/drivers/w1/w1_netlink.h
index eb0c8b3..5644221 100644
--- a/drivers/w1/w1_netlink.h
+++ b/drivers/w1/w1_netlink.h
@@ -23,37 +23,55 @@ #ifndef __W1_NETLINK_H
#define __W1_NETLINK_H

#include <asm/types.h>
+#include <linux/connector.h>

#include "w1.h"

+#define CN_W1_IDX 3
+#define CN_W1_VAL 1
+
enum w1_netlink_message_types {
W1_SLAVE_ADD = 0,
W1_SLAVE_REMOVE,
W1_MASTER_ADD,
W1_MASTER_REMOVE,
+ W1_MASTER_CMD,
+ W1_SLAVE_CMD,
};

struct w1_netlink_msg
{
__u8 type;
- __u8 reserved[3];
- union
- {
- struct w1_reg_num id;
- __u64 w1_id;
- struct
- {
+ __u8 reserved;
+ __u16 len;
+ union {
+ __u8 id[8];
+ struct w1_mst {
__u32 id;
- __u32 pid;
+ __u32 res;
} mst;
} id;
+ __u8 data[0];
+};
+
+#define W1_CMD_READ 0x0
+#define W1_CMD_WRITE 0x1
+#define W1_CMD_SEARCH 0x2
+#define W1_CMD_ALARM_SEARCH 0x3
+
+struct w1_netlink_cmd
+{
+ __u8 cmd;
+ __u8 res;
+ __u16 len;
+ __u8 data[0];
};

#ifdef __KERNEL__

void w1_netlink_send(struct w1_master *, struct w1_netlink_msg *);
-int dev_init_netlink(struct w1_master *dev);
-void dev_fini_netlink(struct w1_master *dev);
+int w1_init_netlink(void);
+void w1_fini_netlink(void);

#endif /* __KERNEL__ */
#endif /* __W1_NETLINK_H */
--
1.4.0

-
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