[PATCH] w1: Userspace communication protocol over connector.
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@2ka.mipt.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>hifive-unleashed-5.1
Evgeniy Polyakov
Greg Kroah-Hartman
parent
81f6075ebc
commit
12003375ac
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@ -0,0 +1,98 @@
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Userspace communication protocol over connector [1].
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Message types.
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=============
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There are three types of messages between w1 core and userspace:
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1. Events. They are generated each time new master or slave device found
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either due to automatic or requested search.
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2. Userspace commands. Includes read/write and search/alarm search comamnds.
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3. Replies to userspace commands.
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Protocol.
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========
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[struct cn_msg] - connector header. It's length field is equal to size of the attached data.
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[struct w1_netlink_msg] - w1 netlink header.
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__u8 type - message type.
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W1_SLAVE_ADD/W1_SLAVE_REMOVE - slave add/remove events.
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W1_MASTER_ADD/W1_MASTER_REMOVE - master add/remove events.
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W1_MASTER_CMD - userspace command for bus master device (search/alarm search).
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W1_SLAVE_CMD - userspace command for slave device (read/write/ search/alarm search
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for bus master device where given slave device found).
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__u8 res - reserved
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__u16 len - size of attached to this header data.
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union {
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__u8 id; - slave unique device id
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struct w1_mst {
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__u32 id; - master's id.
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__u32 res; - reserved
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} mst;
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} id;
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[strucrt w1_netlink_cmd] - command for gived master or slave device.
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__u8 cmd - command opcode.
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W1_CMD_READ - read command.
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W1_CMD_WRITE - write command.
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W1_CMD_SEARCH - search command.
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W1_CMD_ALARM_SEARCH - alarm search command.
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__u8 res - reserved
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__u16 len - length of data for this command.
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For read command data must be allocated like for write command.
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__u8 data[0] - data for this command.
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Each connector message can include one or more w1_netlink_msg with zero of more attached w1_netlink_cmd messages.
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For event messages there are no w1_netlink_cmd embedded structures, only connector header
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and w1_netlink_msg strucutre with "len" field being zero and filled type (one of event types)
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and id - either 8 bytes of slave unique id in host order, or master's id, which is assigned
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to bus master device when it is added to w1 core.
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Currently replies to userspace commands are only generated for read command request.
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One reply is generated exactly for one w1_netlink_cmd read request.
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Replies are not combined when sent - i.e. typical reply messages looks like the following:
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[cn_msg][w1_netlink_msg][w1_netlink_cmd]
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cn_msg.len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd) + cmd->len;
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w1_netlink_msg.len = sizeof(struct w1_netlink_cmd) + cmd->len;
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w1_netlink_cmd.len = cmd->len;
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Operation steps in w1 core when new command is received.
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=======================================================
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When new message (w1_netlink_msg) is received w1 core detects if it is master of slave request,
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according to w1_netlink_msg.type field.
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Then master or slave device is searched for.
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When found, master device (requested or those one on where slave device is found) is locked.
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If slave command is requested, then reset/select procedure is started to select given device.
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Then all requested in w1_netlink_msg operations are performed one by one.
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If command requires reply (like read command) it is sent on command completion.
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When all commands (w1_netlink_cmd) are processed muster device is unlocked
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and next w1_netlink_msg header processing started.
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Connector [1] specific documentation.
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====================================
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Each connector message includes two u32 fields as "address".
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w1 uses CN_W1_IDX and CN_W1_VAL defined in include/linux/connector.h header.
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Each message also includes sequence and acknowledge numbers.
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Sequence number for event messages is appropriate bus master sequence number increased with
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each event message sent "through" this master.
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Sequence number for userspace requests is set by userspace application.
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Sequence number for reply is the same as was in request, and
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acknowledge number is set to seq+1.
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Additional documantion, source code examples.
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============================================
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1. Documentation/connector
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2. http://tservice.net.ru/~s0mbre/archive/w1
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This archive includes userspace application w1d.c which
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uses read/write/search commands for all master/slave devices found on the bus.
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@ -2,7 +2,7 @@
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# Makefile for the Dallas's 1-wire bus.
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#
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ifneq ($(CONFIG_NET), y)
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ifeq ($(CONFIG_CONNECTOR), n)
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EXTRA_CFLAGS += -DNETLINK_DISABLED
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endif
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@ -22,7 +22,6 @@
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#endif
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#include "../w1.h"
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#include "../w1_io.h"
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#include "../w1_int.h"
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#include "../w1_family.h"
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@ -28,7 +28,6 @@
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#include <linux/types.h>
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#include "../w1.h"
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#include "../w1_io.h"
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#include "../w1_int.h"
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#include "../w1_family.h"
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@ -29,7 +29,6 @@
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#include <linux/delay.h>
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#include "../w1.h"
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#include "../w1_io.h"
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#include "../w1_int.h"
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#include "../w1_family.h"
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137
drivers/w1/w1.c
137
drivers/w1/w1.c
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@ -35,7 +35,6 @@
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#include <asm/atomic.h>
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#include "w1.h"
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#include "w1_io.h"
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#include "w1_log.h"
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#include "w1_int.h"
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#include "w1_family.h"
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@ -55,7 +54,7 @@ module_param_named(control_timeout, w1_control_timeout, int, 0);
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module_param_named(max_slave_count, w1_max_slave_count, int, 0);
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module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
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DEFINE_SPINLOCK(w1_mlock);
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DECLARE_MUTEX(w1_mlock);
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LIST_HEAD(w1_masters);
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static struct task_struct *w1_control_thread;
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@ -75,8 +74,6 @@ static void w1_master_release(struct device *dev)
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struct w1_master *md = dev_to_w1_master(dev);
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dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
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dev_fini_netlink(md);
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memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
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kfree(md);
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}
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@ -85,10 +82,10 @@ static void w1_slave_release(struct device *dev)
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{
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struct w1_slave *sl = dev_to_w1_slave(dev);
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dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name);
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printk("%s: Releasing %s.\n", __func__, sl->name);
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while (atomic_read(&sl->refcnt)) {
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dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n",
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printk("Waiting for %s to become free: refcnt=%d.\n",
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sl->name, atomic_read(&sl->refcnt));
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if (msleep_interruptible(1000))
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flush_signals(current);
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@ -111,7 +108,6 @@ static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, siz
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{
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struct w1_slave *sl = kobj_to_w1_slave(kobj);
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atomic_inc(&sl->refcnt);
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if (off > 8) {
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count = 0;
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} else {
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@ -120,7 +116,6 @@ static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, siz
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memcpy(buf, (u8 *)&sl->reg_num, count);
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}
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atomic_dec(&sl->refcnt);
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return count;
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}
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@ -230,12 +225,11 @@ struct device w1_master_device = {
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.release = &w1_master_release
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};
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static struct device_driver w1_slave_driver = {
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struct device_driver w1_slave_driver = {
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.name = "w1_slave_driver",
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.bus = &w1_bus_type,
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};
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#if 0
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struct device w1_slave_device = {
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.parent = NULL,
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.bus = &w1_bus_type,
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@ -243,7 +237,6 @@ struct device w1_slave_device = {
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.driver = &w1_slave_driver,
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.release = &w1_slave_release
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};
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#endif /* 0 */
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static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
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{
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@ -423,7 +416,7 @@ int w1_create_master_attributes(struct w1_master *master)
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return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
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}
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static void w1_destroy_master_attributes(struct w1_master *master)
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void w1_destroy_master_attributes(struct w1_master *master)
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{
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sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
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}
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@ -454,14 +447,11 @@ static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer
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if (dev->driver != &w1_slave_driver || !sl)
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return 0;
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err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
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&cur_len, "W1_FID=%02X", sl->reg_num.family);
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err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_FID=%02X", sl->reg_num.family);
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if (err)
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return err;
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err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
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&cur_len, "W1_SLAVE_ID=%024LX",
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(unsigned long long)sl->reg_num.id);
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err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_SLAVE_ID=%024LX", (u64)sl->reg_num.id);
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if (err)
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return err;
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@ -563,6 +553,7 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
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sl->master = dev;
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set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
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memset(&msg, 0, sizeof(msg));
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memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
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atomic_set(&sl->refcnt, 0);
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init_completion(&sl->released);
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@ -593,7 +584,7 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
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sl->ttl = dev->slave_ttl;
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dev->slave_count++;
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memcpy(&msg.id.id, rn, sizeof(msg.id.id));
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memcpy(msg.id.id, rn, sizeof(msg.id));
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msg.type = W1_SLAVE_ADD;
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w1_netlink_send(dev, &msg);
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@ -611,7 +602,8 @@ static void w1_slave_detach(struct w1_slave *sl)
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if (sl->family->fops && sl->family->fops->remove_slave)
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sl->family->fops->remove_slave(sl);
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memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id));
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memset(&msg, 0, sizeof(msg));
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memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id));
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msg.type = W1_SLAVE_REMOVE;
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w1_netlink_send(sl->master, &msg);
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@ -628,7 +620,7 @@ static struct w1_master *w1_search_master(void *data)
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struct w1_master *dev;
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int found = 0;
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spin_lock_bh(&w1_mlock);
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down(&w1_mlock);
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list_for_each_entry(dev, &w1_masters, w1_master_entry) {
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if (dev->bus_master->data == data) {
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found = 1;
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@ -636,22 +628,69 @@ static struct w1_master *w1_search_master(void *data)
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break;
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}
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}
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spin_unlock_bh(&w1_mlock);
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up(&w1_mlock);
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return (found)?dev:NULL;
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}
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struct w1_master *w1_search_master_id(u32 id)
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{
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struct w1_master *dev;
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int found = 0;
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down(&w1_mlock);
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list_for_each_entry(dev, &w1_masters, w1_master_entry) {
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if (dev->id == id) {
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found = 1;
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atomic_inc(&dev->refcnt);
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break;
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}
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}
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up(&w1_mlock);
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return (found)?dev:NULL;
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}
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struct w1_slave *w1_search_slave(struct w1_reg_num *id)
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{
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struct w1_master *dev;
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struct w1_slave *sl = NULL;
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int found = 0;
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down(&w1_mlock);
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list_for_each_entry(dev, &w1_masters, w1_master_entry) {
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down(&dev->mutex);
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list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
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if (sl->reg_num.family == id->family &&
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sl->reg_num.id == id->id &&
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sl->reg_num.crc == id->crc) {
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found = 1;
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atomic_inc(&dev->refcnt);
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atomic_inc(&sl->refcnt);
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break;
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}
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}
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up(&dev->mutex);
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if (found)
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break;
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}
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up(&w1_mlock);
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return (found)?sl:NULL;
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}
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void w1_reconnect_slaves(struct w1_family *f)
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{
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struct w1_master *dev;
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spin_lock_bh(&w1_mlock);
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down(&w1_mlock);
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list_for_each_entry(dev, &w1_masters, w1_master_entry) {
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dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n",
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dev->name, f->fid);
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set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
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}
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spin_unlock_bh(&w1_mlock);
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up(&w1_mlock);
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}
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static void w1_slave_found(void *data, u64 rn)
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@ -713,7 +752,7 @@ static void w1_slave_found(void *data, u64 rn)
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* @dev The master device to search
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* @cb Function to call when a device is found
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*/
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void w1_search(struct w1_master *dev, w1_slave_found_callback cb)
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void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
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{
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u64 last_rn, rn, tmp64;
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int i, slave_count = 0;
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@ -744,7 +783,7 @@ void w1_search(struct w1_master *dev, w1_slave_found_callback cb)
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}
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/* Start the search */
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w1_write_8(dev, W1_SEARCH);
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w1_write_8(dev, search_type);
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for (i = 0; i < 64; ++i) {
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/* Determine the direction/search bit */
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if (i == desc_bit)
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@ -806,9 +845,9 @@ static int w1_control(void *data)
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if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
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set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
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spin_lock(&w1_mlock);
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down(&w1_mlock);
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list_del(&dev->w1_master_entry);
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spin_unlock(&w1_mlock);
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up(&w1_mlock);
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down(&dev->mutex);
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list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
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@ -843,10 +882,31 @@ static int w1_control(void *data)
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return 0;
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}
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void w1_search_process(struct w1_master *dev, u8 search_type)
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{
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struct w1_slave *sl, *sln;
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list_for_each_entry(sl, &dev->slist, w1_slave_entry)
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clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
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w1_search_devices(dev, search_type, w1_slave_found);
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list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
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if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
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w1_slave_detach(sl);
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dev->slave_count--;
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} else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
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sl->ttl = dev->slave_ttl;
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}
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if (dev->search_count > 0)
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dev->search_count--;
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}
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int w1_process(void *data)
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{
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struct w1_master *dev = (struct w1_master *) data;
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struct w1_slave *sl, *sln;
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while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
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try_to_freeze();
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@ -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);
|
||||
|
|
|
|||
|
|
@ -42,8 +42,6 @@ struct w1_reg_num
|
|||
#include <linux/completion.h>
|
||||
#include <linux/device.h>
|
||||
|
||||
#include <net/sock.h>
|
||||
|
||||
#include <asm/semaphore.h>
|
||||
|
||||
#include "w1_family.h"
|
||||
|
|
@ -52,7 +50,7 @@ struct w1_reg_num
|
|||
#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_w1_master(struct device *dev)
|
|||
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 */
|
||||
|
|
|
|||
|
|
@ -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 */
|
||||
|
|
|
|||
|
|
@ -27,10 +27,19 @@
|
|||
#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(u32 id, int slave_count, int slave_ttl,
|
|||
|
||||
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(u32 id, int slave_count, int slave_ttl,
|
|||
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_master *master)
|
|||
|
||||
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_master *dev)
|
|||
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);
|
||||
|
||||
|
|
|
|||
|
|
@ -26,7 +26,6 @@
|
|||
|
||||
#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_slave *sl)
|
|||
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);
|
||||
|
|
|
|||
|
|
@ -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 @@
|
|||
#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);
|
||||
|
||||
memcpy(data, msg, sizeof(struct w1_netlink_msg));
|
||||
|
||||
NETLINK_CB(skb).dst_group = dev->groups;
|
||||
netlink_broadcast(dev->nls, skb, 0, dev->groups, GFP_ATOMIC);
|
||||
|
||||
nlmsg_failure:
|
||||
return;
|
||||
cn_netlink_send(m, 0, GFP_KERNEL);
|
||||
}
|
||||
|
||||
int dev_init_netlink(struct w1_master *dev)
|
||||
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->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);
|
||||
}
|
||||
dev_dbg(&dev->dev, "%s: %s: cmd=%02x, len=%u.\n",
|
||||
__func__, dev->name, cmd->cmd, cmd->len);
|
||||
|
||||
if (cmd->cmd != W1_CMD_SEARCH && cmd->cmd != W1_CMD_ALARM_SEARCH)
|
||||
return -EINVAL;
|
||||
|
||||
w1_search_process(dev, (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void dev_fini_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)
|
||||
{
|
||||
if (dev->nls && dev->nls->sk_socket)
|
||||
sock_release(dev->nls->sk_socket);
|
||||
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 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
|
||||
}
|
||||
|
||||
int w1_init_netlink(void)
|
||||
{
|
||||
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 *dev, struct w1_netlink_msg *msg)
|
|||
{
|
||||
}
|
||||
|
||||
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
|
||||
|
|
|
|||
|
|
@ -23,37 +23,55 @@
|
|||
#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 */
|
||||
|
|
|
|||
Loading…
Reference in New Issue