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drivers/w1/w1.c
25.5 KB
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/* |
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* w1.c |
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* * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> |
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* |
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* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/delay.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/list.h> #include <linux/interrupt.h> #include <linux/spinlock.h> #include <linux/timer.h> #include <linux/device.h> #include <linux/slab.h> #include <linux/sched.h> |
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#include <linux/kthread.h> |
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#include <linux/freezer.h> |
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#include <asm/atomic.h> #include "w1.h" |
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#include "w1_log.h" #include "w1_int.h" #include "w1_family.h" #include "w1_netlink.h" MODULE_LICENSE("GPL"); MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); static int w1_timeout = 10; int w1_max_slave_count = 10; int w1_max_slave_ttl = 10; module_param_named(timeout, w1_timeout, int, 0); module_param_named(max_slave_count, w1_max_slave_count, int, 0); module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); |
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DEFINE_MUTEX(w1_mlock); |
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LIST_HEAD(w1_masters); |
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static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn); |
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static int w1_master_match(struct device *dev, struct device_driver *drv) { return 1; } static int w1_master_probe(struct device *dev) { return -ENODEV; } |
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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. ", __func__, md->name); |
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memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); kfree(md); |
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} static void w1_slave_release(struct device *dev) { |
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struct w1_slave *sl = dev_to_w1_slave(dev); |
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|
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dev_dbg(dev, "%s: Releasing %s. ", __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. ", |
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sl->name, atomic_read(&sl->refcnt)); if (msleep_interruptible(1000)) flush_signals(current); } w1_family_put(sl->family); sl->master->slave_count--; complete(&sl->released); |
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} |
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static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct w1_slave *sl = dev_to_w1_slave(dev); |
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|
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return sprintf(buf, "%s ", sl->name); |
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} |
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static ssize_t w1_slave_read_id(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct w1_slave *sl = dev_to_w1_slave(dev); ssize_t count = sizeof(sl->reg_num); |
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|
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memcpy(buf, (u8 *)&sl->reg_num, count); |
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return count; |
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} |
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static struct device_attribute w1_slave_attr_name = __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); |
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static struct device_attribute w1_slave_attr_id = __ATTR(id, S_IRUGO, w1_slave_read_id, NULL); |
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|
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/* Default family */ |
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|
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static ssize_t w1_default_write(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) |
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{ struct w1_slave *sl = kobj_to_w1_slave(kobj); |
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mutex_lock(&sl->master->mutex); |
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if (w1_reset_select_slave(sl)) { count = 0; goto out_up; } w1_write_block(sl->master, buf, count); out_up: |
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mutex_unlock(&sl->master->mutex); |
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return count; } |
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static ssize_t w1_default_read(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) |
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{ struct w1_slave *sl = kobj_to_w1_slave(kobj); |
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mutex_lock(&sl->master->mutex); |
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w1_read_block(sl->master, buf, count); |
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mutex_unlock(&sl->master->mutex); |
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return count; } static struct bin_attribute w1_default_attr = { .attr = { .name = "rw", .mode = S_IRUGO | S_IWUSR, |
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}, .size = PAGE_SIZE, .read = w1_default_read, .write = w1_default_write, }; static int w1_default_add_slave(struct w1_slave *sl) { return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr); } static void w1_default_remove_slave(struct w1_slave *sl) { sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr); } static struct w1_family_ops w1_default_fops = { .add_slave = w1_default_add_slave, .remove_slave = w1_default_remove_slave, }; static struct w1_family w1_default_family = { .fops = &w1_default_fops, }; |
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|
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static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
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|
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static struct bus_type w1_bus_type = { .name = "w1", .match = w1_master_match, |
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.uevent = w1_uevent, |
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}; |
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struct device_driver w1_master_driver = { .name = "w1_master_driver", |
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.bus = &w1_bus_type, .probe = w1_master_probe, |
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}; |
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struct device w1_master_device = { |
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.parent = NULL, .bus = &w1_bus_type, |
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.init_name = "w1 bus master", |
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.driver = &w1_master_driver, |
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.release = &w1_master_release }; |
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static struct device_driver w1_slave_driver = { |
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.name = "w1_slave_driver", .bus = &w1_bus_type, }; |
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#if 0 |
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struct device w1_slave_device = { .parent = NULL, .bus = &w1_bus_type, |
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.init_name = "w1 bus slave", |
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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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|
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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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struct w1_master *md = dev_to_w1_master(dev); |
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ssize_t count; |
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|
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mutex_lock(&md->mutex); |
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count = sprintf(buf, "%s ", md->name); |
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mutex_unlock(&md->mutex); |
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return count; } |
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static ssize_t w1_master_attribute_store_search(struct device * dev, struct device_attribute *attr, const char * buf, size_t count) { |
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long tmp; |
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struct w1_master *md = dev_to_w1_master(dev); |
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|
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if (strict_strtol(buf, 0, &tmp) == -EINVAL) return -EINVAL; |
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mutex_lock(&md->mutex); |
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md->search_count = tmp; |
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mutex_unlock(&md->mutex); |
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wake_up_process(md->thread); |
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return count; } static ssize_t w1_master_attribute_show_search(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct w1_master *md = dev_to_w1_master(dev); |
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ssize_t count; |
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mutex_lock(&md->mutex); |
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count = sprintf(buf, "%d ", md->search_count); |
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mutex_unlock(&md->mutex); |
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return count; } |
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static ssize_t w1_master_attribute_store_pullup(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { long tmp; struct w1_master *md = dev_to_w1_master(dev); if (strict_strtol(buf, 0, &tmp) == -EINVAL) return -EINVAL; mutex_lock(&md->mutex); md->enable_pullup = tmp; mutex_unlock(&md->mutex); wake_up_process(md->thread); return count; } static ssize_t w1_master_attribute_show_pullup(struct device *dev, struct device_attribute *attr, char *buf) { struct w1_master *md = dev_to_w1_master(dev); ssize_t count; mutex_lock(&md->mutex); count = sprintf(buf, "%d ", md->enable_pullup); mutex_unlock(&md->mutex); return count; } |
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static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct w1_master *md = dev_to_w1_master(dev); |
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ssize_t count; |
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|
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mutex_lock(&md->mutex); |
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count = sprintf(buf, "0x%p ", md->bus_master); |
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mutex_unlock(&md->mutex); |
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return count; } |
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static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
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{ ssize_t count; count = sprintf(buf, "%d ", w1_timeout); return count; } |
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static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct w1_master *md = dev_to_w1_master(dev); |
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ssize_t count; |
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|
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mutex_lock(&md->mutex); |
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count = sprintf(buf, "%d ", md->max_slave_count); |
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mutex_unlock(&md->mutex); |
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return count; } |
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static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct w1_master *md = dev_to_w1_master(dev); |
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ssize_t count; |
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|
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mutex_lock(&md->mutex); |
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count = sprintf(buf, "%lu ", md->attempts); |
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mutex_unlock(&md->mutex); |
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return count; } |
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static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct w1_master *md = dev_to_w1_master(dev); |
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ssize_t count; |
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|
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mutex_lock(&md->mutex); |
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count = sprintf(buf, "%d ", md->slave_count); |
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mutex_unlock(&md->mutex); |
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return count; } |
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static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct w1_master *md = dev_to_w1_master(dev); |
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int c = PAGE_SIZE; |
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mutex_lock(&md->mutex); |
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if (md->slave_count == 0) c -= snprintf(buf + PAGE_SIZE - c, c, "not found. "); else { struct list_head *ent, *n; struct w1_slave *sl; list_for_each_safe(ent, n, &md->slist) { sl = list_entry(ent, struct w1_slave, w1_slave_entry); |
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c -= snprintf(buf + PAGE_SIZE - c, c, "%s ", sl->name); |
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} } |
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mutex_unlock(&md->mutex); |
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return PAGE_SIZE - c; } |
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static ssize_t w1_master_attribute_show_add(struct device *dev, struct device_attribute *attr, char *buf) { int c = PAGE_SIZE; c -= snprintf(buf+PAGE_SIZE - c, c, "write device id xx-xxxxxxxxxxxx to add slave "); return PAGE_SIZE - c; } static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, struct w1_reg_num *rn) { unsigned int family; unsigned long long id; int i; u64 rn64_le; /* The CRC value isn't read from the user because the sysfs directory * doesn't include it and most messages from the bus search don't * print it either. It would be unreasonable for the user to then * provide it. */ const char *error_msg = "bad slave string format, expecting " "ff-dddddddddddd "; if (buf[2] != '-') { dev_err(dev, "%s", error_msg); return -EINVAL; } i = sscanf(buf, "%02x-%012llx", &family, &id); if (i != 2) { dev_err(dev, "%s", error_msg); return -EINVAL; } rn->family = family; rn->id = id; rn64_le = cpu_to_le64(*(u64 *)rn); rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); #if 0 dev_info(dev, "With CRC device is %02x.%012llx.%02x. ", rn->family, (unsigned long long)rn->id, rn->crc); #endif return 0; } /* Searches the slaves in the w1_master and returns a pointer or NULL. * Note: must hold the mutex */ static struct w1_slave *w1_slave_search_device(struct w1_master *dev, struct w1_reg_num *rn) { struct w1_slave *sl; list_for_each_entry(sl, &dev->slist, w1_slave_entry) { if (sl->reg_num.family == rn->family && sl->reg_num.id == rn->id && sl->reg_num.crc == rn->crc) { return sl; } } return NULL; } static ssize_t w1_master_attribute_store_add(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct w1_master *md = dev_to_w1_master(dev); struct w1_reg_num rn; struct w1_slave *sl; ssize_t result = count; if (w1_atoreg_num(dev, buf, count, &rn)) return -EINVAL; mutex_lock(&md->mutex); sl = w1_slave_search_device(md, &rn); /* It would be nice to do a targeted search one the one-wire bus * for the new device to see if it is out there or not. But the * current search doesn't support that. */ if (sl) { dev_info(dev, "Device %s already exists ", sl->name); result = -EINVAL; } else { w1_attach_slave_device(md, &rn); } mutex_unlock(&md->mutex); return result; } static ssize_t w1_master_attribute_show_remove(struct device *dev, struct device_attribute *attr, char *buf) { int c = PAGE_SIZE; c -= snprintf(buf+PAGE_SIZE - c, c, "write device id xx-xxxxxxxxxxxx to remove slave "); return PAGE_SIZE - c; } static ssize_t w1_master_attribute_store_remove(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct w1_master *md = dev_to_w1_master(dev); struct w1_reg_num rn; struct w1_slave *sl; ssize_t result = count; if (w1_atoreg_num(dev, buf, count, &rn)) return -EINVAL; mutex_lock(&md->mutex); sl = w1_slave_search_device(md, &rn); if (sl) { w1_slave_detach(sl); } else { dev_info(dev, "Device %02x-%012llx doesn't exists ", rn.family, (unsigned long long)rn.id); result = -EINVAL; } mutex_unlock(&md->mutex); return result; } |
7785925dd [PATCH] w1: clean... |
494 495 496 497 |
#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) |
2a9d0c178 [PATCH] w1: Adds ... |
498 499 500 501 502 |
#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) |
7785925dd [PATCH] w1: clean... |
503 504 505 506 507 508 509 |
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); |
12aa4c641 w1: don't allow a... |
510 511 512 513 |
static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); |
7785925dd [PATCH] w1: clean... |
514 515 516 517 518 519 520 521 522 |
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, |
2a9d0c178 [PATCH] w1: Adds ... |
523 |
&w1_master_attribute_search.attr, |
6a158c0de W1: feature, enab... |
524 |
&w1_master_attribute_pullup.attr, |
9b4674111 W1: be able to ma... |
525 526 |
&w1_master_attribute_add.attr, &w1_master_attribute_remove.attr, |
7785925dd [PATCH] w1: clean... |
527 |
NULL |
1da177e4c Linux-2.6.12-rc2 |
528 |
}; |
7785925dd [PATCH] w1: clean... |
529 530 |
static struct attribute_group w1_master_defattr_group = { .attrs = w1_master_default_attrs, |
1da177e4c Linux-2.6.12-rc2 |
531 |
}; |
7785925dd [PATCH] w1: clean... |
532 533 534 535 |
int w1_create_master_attributes(struct w1_master *master) { return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); } |
c30c9b151 W1: fix deadlocks... |
536 |
void w1_destroy_master_attributes(struct w1_master *master) |
7785925dd [PATCH] w1: clean... |
537 538 539 |
{ sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); } |
7f772ed8d [PATCH] w1: hotpl... |
540 |
#ifdef CONFIG_HOTPLUG |
7eff2e7a8 Driver core: chan... |
541 |
static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8d [PATCH] w1: hotpl... |
542 543 544 545 |
{ struct w1_master *md = NULL; struct w1_slave *sl = NULL; char *event_owner, *name; |
7eff2e7a8 Driver core: chan... |
546 |
int err; |
7f772ed8d [PATCH] w1: hotpl... |
547 548 549 550 551 552 553 554 555 556 |
if (dev->driver == &w1_master_driver) { md = container_of(dev, struct w1_master, dev); event_owner = "master"; name = md->name; } else if (dev->driver == &w1_slave_driver) { sl = container_of(dev, struct w1_slave, dev); event_owner = "slave"; name = sl->name; } else { |
312c004d3 [PATCH] driver co... |
557 558 |
dev_dbg(dev, "Unknown event. "); |
7f772ed8d [PATCH] w1: hotpl... |
559 560 |
return -EINVAL; } |
c6976a4eb [PATCH] w1: warni... |
561 562 |
dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s. ", |
40f91de6a w1: struct device... |
563 |
event_owner, name, dev_name(dev)); |
7f772ed8d [PATCH] w1: hotpl... |
564 565 566 |
if (dev->driver != &w1_slave_driver || !sl) return 0; |
7eff2e7a8 Driver core: chan... |
567 |
err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
7f772ed8d [PATCH] w1: hotpl... |
568 569 |
if (err) return err; |
7eff2e7a8 Driver core: chan... |
570 571 |
err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", (unsigned long long)sl->reg_num.id); |
7f772ed8d [PATCH] w1: hotpl... |
572 573 574 575 576 577 |
if (err) return err; return 0; }; #else |
7eff2e7a8 Driver core: chan... |
578 |
static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
7f772ed8d [PATCH] w1: hotpl... |
579 580 581 582 |
{ return 0; } #endif |
1da177e4c Linux-2.6.12-rc2 |
583 584 585 586 587 |
static int __w1_attach_slave_device(struct w1_slave *sl) { int err; sl->dev.parent = &sl->master->dev; |
7f772ed8d [PATCH] w1: hotpl... |
588 |
sl->dev.driver = &w1_slave_driver; |
1da177e4c Linux-2.6.12-rc2 |
589 590 |
sl->dev.bus = &w1_bus_type; sl->dev.release = &w1_slave_release; |
40f91de6a w1: struct device... |
591 |
dev_set_name(&sl->dev, "%02x-%012llx", |
6b7298618 [PATCH] w1: Added... |
592 593 594 595 596 597 |
(unsigned int) sl->reg_num.family, (unsigned long long) sl->reg_num.id); snprintf(&sl->name[0], sizeof(sl->name), "%02x-%012llx", (unsigned int) sl->reg_num.family, (unsigned long long) sl->reg_num.id); |
1da177e4c Linux-2.6.12-rc2 |
598 |
|
c6976a4eb [PATCH] w1: warni... |
599 600 |
dev_dbg(&sl->dev, "%s: registering %s as %p. ", __func__, |
40f91de6a w1: struct device... |
601 |
dev_name(&sl->dev), sl); |
1da177e4c Linux-2.6.12-rc2 |
602 603 604 605 |
err = device_register(&sl->dev); if (err < 0) { dev_err(&sl->dev, |
6b7298618 [PATCH] w1: Added... |
606 607 |
"Device registration [%s] failed. err=%d ", |
40f91de6a w1: struct device... |
608 |
dev_name(&sl->dev), err); |
1da177e4c Linux-2.6.12-rc2 |
609 610 |
return err; } |
d2a4ef6a0 [PATCH] w1: Added... |
611 612 613 614 615 616 |
/* Create "name" entry */ err = device_create_file(&sl->dev, &w1_slave_attr_name); if (err < 0) { dev_err(&sl->dev, "sysfs file creation for [%s] failed. err=%d ", |
40f91de6a w1: struct device... |
617 |
dev_name(&sl->dev), err); |
d2a4ef6a0 [PATCH] w1: Added... |
618 619 |
goto out_unreg; } |
1da177e4c Linux-2.6.12-rc2 |
620 |
|
d2a4ef6a0 [PATCH] w1: Added... |
621 |
/* Create "id" entry */ |
07e003417 W1: w1_slave_read... |
622 |
err = device_create_file(&sl->dev, &w1_slave_attr_id); |
1da177e4c Linux-2.6.12-rc2 |
623 624 |
if (err < 0) { dev_err(&sl->dev, |
6b7298618 [PATCH] w1: Added... |
625 626 |
"sysfs file creation for [%s] failed. err=%d ", |
40f91de6a w1: struct device... |
627 |
dev_name(&sl->dev), err); |
d2a4ef6a0 [PATCH] w1: Added... |
628 |
goto out_rem1; |
1da177e4c Linux-2.6.12-rc2 |
629 |
} |
d2a4ef6a0 [PATCH] w1: Added... |
630 631 632 633 634 635 |
/* if the family driver needs to initialize something... */ if (sl->family->fops && sl->family->fops->add_slave && ((err = sl->family->fops->add_slave(sl)) < 0)) { dev_err(&sl->dev, "sysfs file creation for [%s] failed. err=%d ", |
40f91de6a w1: struct device... |
636 |
dev_name(&sl->dev), err); |
d2a4ef6a0 [PATCH] w1: Added... |
637 |
goto out_rem2; |
1da177e4c Linux-2.6.12-rc2 |
638 639 640 641 642 |
} list_add_tail(&sl->w1_slave_entry, &sl->master->slist); return 0; |
d2a4ef6a0 [PATCH] w1: Added... |
643 644 |
out_rem2: |
07e003417 W1: w1_slave_read... |
645 |
device_remove_file(&sl->dev, &w1_slave_attr_id); |
d2a4ef6a0 [PATCH] w1: Added... |
646 647 648 649 650 |
out_rem1: device_remove_file(&sl->dev, &w1_slave_attr_name); out_unreg: device_unregister(&sl->dev); return err; |
1da177e4c Linux-2.6.12-rc2 |
651 652 653 654 655 656 657 658 |
} static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) { struct w1_slave *sl; struct w1_family *f; int err; struct w1_netlink_msg msg; |
dd00cc486 some kmalloc/mems... |
659 |
sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
660 661 662 663 664 665 666 |
if (!sl) { dev_err(&dev->dev, "%s: failed to allocate new slave device. ", __func__); return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
667 668 669 670 |
sl->owner = THIS_MODULE; sl->master = dev; set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); |
12003375a [PATCH] w1: Users... |
671 |
memset(&msg, 0, sizeof(msg)); |
1da177e4c Linux-2.6.12-rc2 |
672 673 |
memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); atomic_set(&sl->refcnt, 0); |
3aca692d3 [PATCH] w1: Detou... |
674 |
init_completion(&sl->released); |
1da177e4c Linux-2.6.12-rc2 |
675 676 677 678 |
spin_lock(&w1_flock); f = w1_family_registered(rn->family); if (!f) { |
99c5bfe99 [PATCH] w1: Adds ... |
679 |
f= &w1_default_family; |
1da177e4c Linux-2.6.12-rc2 |
680 681 682 683 |
dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered. ", rn->family, rn->family, (unsigned long long)rn->id, rn->crc); |
1da177e4c Linux-2.6.12-rc2 |
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 |
} __w1_family_get(f); spin_unlock(&w1_flock); sl->family = f; err = __w1_attach_slave_device(sl); if (err < 0) { dev_err(&dev->dev, "%s: Attaching %s failed. ", __func__, sl->name); w1_family_put(sl->family); kfree(sl); return err; } sl->ttl = dev->slave_ttl; dev->slave_count++; |
12003375a [PATCH] w1: Users... |
703 |
memcpy(msg.id.id, rn, sizeof(msg.id)); |
1da177e4c Linux-2.6.12-rc2 |
704 705 706 707 708 |
msg.type = W1_SLAVE_ADD; w1_netlink_send(dev, &msg); return 0; } |
c30c9b151 W1: fix deadlocks... |
709 |
void w1_slave_detach(struct w1_slave *sl) |
1da177e4c Linux-2.6.12-rc2 |
710 711 |
{ struct w1_netlink_msg msg; |
7785925dd [PATCH] w1: clean... |
712 |
|
7c8f5703d [PATCH] w1: Decre... |
713 714 |
dev_dbg(&sl->dev, "%s: detaching %s [%p]. ", __func__, sl->name, sl); |
1da177e4c Linux-2.6.12-rc2 |
715 |
|
3aca692d3 [PATCH] w1: Detou... |
716 |
list_del(&sl->w1_slave_entry); |
1da177e4c Linux-2.6.12-rc2 |
717 |
|
d2a4ef6a0 [PATCH] w1: Added... |
718 719 |
if (sl->family->fops && sl->family->fops->remove_slave) sl->family->fops->remove_slave(sl); |
12003375a [PATCH] w1: Users... |
720 721 |
memset(&msg, 0, sizeof(msg)); memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); |
3aca692d3 [PATCH] w1: Detou... |
722 723 |
msg.type = W1_SLAVE_REMOVE; w1_netlink_send(sl->master, &msg); |
07e003417 W1: w1_slave_read... |
724 |
device_remove_file(&sl->dev, &w1_slave_attr_id); |
d2a4ef6a0 [PATCH] w1: Added... |
725 |
device_remove_file(&sl->dev, &w1_slave_attr_name); |
1da177e4c Linux-2.6.12-rc2 |
726 |
device_unregister(&sl->dev); |
1da177e4c Linux-2.6.12-rc2 |
727 |
|
3aca692d3 [PATCH] w1: Detou... |
728 729 |
wait_for_completion(&sl->released); kfree(sl); |
1da177e4c Linux-2.6.12-rc2 |
730 |
} |
12003375a [PATCH] w1: Users... |
731 732 733 734 |
struct w1_master *w1_search_master_id(u32 id) { struct w1_master *dev; int found = 0; |
abd52a132 [PATCH] w1: Use m... |
735 |
mutex_lock(&w1_mlock); |
12003375a [PATCH] w1: Users... |
736 737 738 739 740 741 742 |
list_for_each_entry(dev, &w1_masters, w1_master_entry) { if (dev->id == id) { found = 1; atomic_inc(&dev->refcnt); break; } } |
abd52a132 [PATCH] w1: Use m... |
743 |
mutex_unlock(&w1_mlock); |
12003375a [PATCH] w1: Users... |
744 745 746 747 748 749 750 751 752 |
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; |
abd52a132 [PATCH] w1: Use m... |
753 |
mutex_lock(&w1_mlock); |
12003375a [PATCH] w1: Users... |
754 |
list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
abd52a132 [PATCH] w1: Use m... |
755 |
mutex_lock(&dev->mutex); |
12003375a [PATCH] w1: Users... |
756 757 758 759 760 761 762 763 764 765 |
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; } } |
abd52a132 [PATCH] w1: Use m... |
766 |
mutex_unlock(&dev->mutex); |
12003375a [PATCH] w1: Users... |
767 768 769 770 |
if (found) break; } |
abd52a132 [PATCH] w1: Use m... |
771 |
mutex_unlock(&w1_mlock); |
12003375a [PATCH] w1: Users... |
772 773 774 |
return (found)?sl:NULL; } |
c30c9b151 W1: fix deadlocks... |
775 |
void w1_reconnect_slaves(struct w1_family *f, int attach) |
6adf87bd7 [PATCH] w1: recon... |
776 |
{ |
c30c9b151 W1: fix deadlocks... |
777 |
struct w1_slave *sl, *sln; |
6adf87bd7 [PATCH] w1: recon... |
778 |
struct w1_master *dev; |
abd52a132 [PATCH] w1: Use m... |
779 |
mutex_lock(&w1_mlock); |
6adf87bd7 [PATCH] w1: recon... |
780 |
list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
c30c9b151 W1: fix deadlocks... |
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 |
dev_dbg(&dev->dev, "Reconnecting slaves in device %s " "for family %02x. ", dev->name, f->fid); mutex_lock(&dev->mutex); list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { /* If it is a new family, slaves with the default * family driver and are that family will be * connected. If the family is going away, devices * matching that family are reconneced. */ if ((attach && sl->family->fid == W1_FAMILY_DEFAULT && sl->reg_num.family == f->fid) || (!attach && sl->family->fid == f->fid)) { struct w1_reg_num rn; memcpy(&rn, &sl->reg_num, sizeof(rn)); w1_slave_detach(sl); w1_attach_slave_device(dev, &rn); } } dev_dbg(&dev->dev, "Reconnecting slaves in device %s " "has been finished. ", dev->name); mutex_unlock(&dev->mutex); |
6adf87bd7 [PATCH] w1: recon... |
806 |
} |
abd52a132 [PATCH] w1: Use m... |
807 |
mutex_unlock(&w1_mlock); |
6adf87bd7 [PATCH] w1: recon... |
808 |
} |
c30c9b151 W1: fix deadlocks... |
809 |
static void w1_slave_found(struct w1_master *dev, u64 rn) |
1da177e4c Linux-2.6.12-rc2 |
810 |
{ |
1da177e4c Linux-2.6.12-rc2 |
811 |
struct w1_slave *sl; |
1da177e4c Linux-2.6.12-rc2 |
812 |
struct w1_reg_num *tmp; |
0e65f8281 [PATCH] w1: fix C... |
813 |
u64 rn_le = cpu_to_le64(rn); |
1da177e4c Linux-2.6.12-rc2 |
814 |
|
c30c9b151 W1: fix deadlocks... |
815 |
atomic_inc(&dev->refcnt); |
7785925dd [PATCH] w1: clean... |
816 |
|
1da177e4c Linux-2.6.12-rc2 |
817 |
tmp = (struct w1_reg_num *) &rn; |
cd7b28d33 W1: recode w1_sla... |
818 819 820 821 822 823 |
sl = w1_slave_search_device(dev, tmp); if (sl) { set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); } else { if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) w1_attach_slave_device(dev, tmp); |
1da177e4c Linux-2.6.12-rc2 |
824 |
} |
7785925dd [PATCH] w1: clean... |
825 |
|
1da177e4c Linux-2.6.12-rc2 |
826 827 |
atomic_dec(&dev->refcnt); } |
6b7298618 [PATCH] w1: Added... |
828 829 830 831 832 833 834 835 836 837 838 839 840 841 |
/** * 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 */ |
12003375a [PATCH] w1: Users... |
842 |
void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
1da177e4c Linux-2.6.12-rc2 |
843 |
{ |
6b7298618 [PATCH] w1: Added... |
844 845 846 847 848 |
u64 last_rn, rn, tmp64; int i, slave_count = 0; int last_zero, last_device; int search_bit, desc_bit; u8 triplet_ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
849 |
|
6b7298618 [PATCH] w1: Added... |
850 851 852 853 |
search_bit = 0; rn = last_rn = 0; last_device = 0; last_zero = -1; |
1da177e4c Linux-2.6.12-rc2 |
854 855 |
desc_bit = 64; |
6b7298618 [PATCH] w1: Added... |
856 857 |
while ( !last_device && (slave_count++ < dev->max_slave_count) ) { last_rn = rn; |
1da177e4c Linux-2.6.12-rc2 |
858 |
rn = 0; |
1da177e4c Linux-2.6.12-rc2 |
859 860 861 862 863 864 865 |
/* * Reset bus and all 1-wire device state machines * so they can respond to our requests. * * Return 0 - device(s) present, 1 - no devices present. */ if (w1_reset_bus(dev)) { |
2da5bf80f [PATCH] w1: more ... |
866 867 |
dev_dbg(&dev->dev, "No devices present on the wire. "); |
1da177e4c Linux-2.6.12-rc2 |
868 869 |
break; } |
6b7298618 [PATCH] w1: Added... |
870 |
/* Start the search */ |
12003375a [PATCH] w1: Users... |
871 |
w1_write_8(dev, search_type); |
1da177e4c Linux-2.6.12-rc2 |
872 |
for (i = 0; i < 64; ++i) { |
6b7298618 [PATCH] w1: Added... |
873 874 875 876 877 |
/* Determine the direction/search bit */ if (i == desc_bit) search_bit = 1; /* took the 0 path last time, so take the 1 path */ else if (i > desc_bit) search_bit = 0; /* take the 0 path on the next branch */ |
1da177e4c Linux-2.6.12-rc2 |
878 |
else |
6b7298618 [PATCH] w1: Added... |
879 |
search_bit = ((last_rn >> i) & 0x1); |
1da177e4c Linux-2.6.12-rc2 |
880 |
|
6b7298618 [PATCH] w1: Added... |
881 882 883 884 885 886 |
/** Read two bits and write one bit */ triplet_ret = w1_triplet(dev, search_bit); /* quit if no device responded */ if ( (triplet_ret & 0x03) == 0x03 ) break; |
1da177e4c Linux-2.6.12-rc2 |
887 |
|
6b7298618 [PATCH] w1: Added... |
888 889 890 |
/* If both directions were valid, and we took the 0 path... */ if (triplet_ret == 0) last_zero = i; |
1da177e4c Linux-2.6.12-rc2 |
891 |
|
6b7298618 [PATCH] w1: Added... |
892 893 894 |
/* extract the direction taken & update the device number */ tmp64 = (triplet_ret >> 2); rn |= (tmp64 << i); |
0d671b272 W1: abort search ... |
895 |
|
3c52e4e62 W1: w1_process, b... |
896 |
if (kthread_should_stop()) { |
7dc8f527e W1: w1.c s/printk... |
897 898 |
dev_dbg(&dev->dev, "Abort w1_search "); |
0d671b272 W1: abort search ... |
899 900 |
return; } |
6b7298618 [PATCH] w1: Added... |
901 |
} |
7785925dd [PATCH] w1: clean... |
902 |
|
6b7298618 [PATCH] w1: Added... |
903 904 905 906 |
if ( (triplet_ret & 0x03) != 0x03 ) { if ( (desc_bit == last_zero) || (last_zero < 0)) last_device = 1; desc_bit = last_zero; |
c30c9b151 W1: fix deadlocks... |
907 |
cb(dev, rn); |
6b7298618 [PATCH] w1: Added... |
908 |
} |
1da177e4c Linux-2.6.12-rc2 |
909 910 |
} } |
12003375a [PATCH] w1: Users... |
911 912 913 914 915 916 917 918 919 920 |
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) { |
a2a6c74d3 w1: decrement sla... |
921 |
if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) |
12003375a [PATCH] w1: Users... |
922 |
w1_slave_detach(sl); |
a2a6c74d3 w1: decrement sla... |
923 |
else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) |
12003375a [PATCH] w1: Users... |
924 925 926 927 928 929 |
sl->ttl = dev->slave_ttl; } if (dev->search_count > 0) dev->search_count--; } |
1da177e4c Linux-2.6.12-rc2 |
930 931 932 |
int w1_process(void *data) { struct w1_master *dev = (struct w1_master *) data; |
3c52e4e62 W1: w1_process, b... |
933 934 935 936 |
/* As long as w1_timeout is only set by a module parameter the sleep * time can be calculated in jiffies once. */ const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); |
1da177e4c Linux-2.6.12-rc2 |
937 |
|
3c52e4e62 W1: w1_process, b... |
938 |
while (!kthread_should_stop()) { |
01e14d6db W1: don't delay s... |
939 940 941 942 943 |
if (dev->search_count) { mutex_lock(&dev->mutex); w1_search_process(dev, W1_SEARCH); mutex_unlock(&dev->mutex); } |
3e1d1d28d [PATCH] Cleanup p... |
944 |
try_to_freeze(); |
3c52e4e62 W1: w1_process, b... |
945 946 947 948 949 950 951 952 953 954 |
__set_current_state(TASK_INTERRUPTIBLE); if (kthread_should_stop()) break; /* Only sleep when the search is active. */ if (dev->search_count) schedule_timeout(jtime); else schedule(); |
1da177e4c Linux-2.6.12-rc2 |
955 956 957 |
} atomic_dec(&dev->refcnt); |
1da177e4c Linux-2.6.12-rc2 |
958 959 960 |
return 0; } |
73a98fce8 w1: add __init/__... |
961 |
static int __init w1_init(void) |
1da177e4c Linux-2.6.12-rc2 |
962 963 964 965 966 |
{ int retval; printk(KERN_INFO "Driver for 1-wire Dallas network protocol. "); |
12003375a [PATCH] w1: Users... |
967 |
w1_init_netlink(); |
1da177e4c Linux-2.6.12-rc2 |
968 969 970 971 972 973 |
retval = bus_register(&w1_bus_type); if (retval) { printk(KERN_ERR "Failed to register bus. err=%d. ", retval); goto err_out_exit_init; } |
7f772ed8d [PATCH] w1: hotpl... |
974 |
retval = driver_register(&w1_master_driver); |
1da177e4c Linux-2.6.12-rc2 |
975 976 977 978 979 980 981 |
if (retval) { printk(KERN_ERR "Failed to register master driver. err=%d. ", retval); goto err_out_bus_unregister; } |
7f772ed8d [PATCH] w1: hotpl... |
982 983 984 985 986 987 988 989 |
retval = driver_register(&w1_slave_driver); if (retval) { printk(KERN_ERR "Failed to register master driver. err=%d. ", retval); goto err_out_master_unregister; } |
1da177e4c Linux-2.6.12-rc2 |
990 |
return 0; |
c30c9b151 W1: fix deadlocks... |
991 992 |
#if 0 /* For undoing the slave register if there was a step after it. */ |
7f772ed8d [PATCH] w1: hotpl... |
993 994 |
err_out_slave_unregister: driver_unregister(&w1_slave_driver); |
c30c9b151 W1: fix deadlocks... |
995 |
#endif |
7f772ed8d [PATCH] w1: hotpl... |
996 997 998 |
err_out_master_unregister: driver_unregister(&w1_master_driver); |
1da177e4c Linux-2.6.12-rc2 |
999 1000 1001 1002 1003 1004 1005 |
err_out_bus_unregister: bus_unregister(&w1_bus_type); err_out_exit_init: return retval; } |
73a98fce8 w1: add __init/__... |
1006 |
static void __exit w1_fini(void) |
1da177e4c Linux-2.6.12-rc2 |
1007 1008 |
{ struct w1_master *dev; |
1da177e4c Linux-2.6.12-rc2 |
1009 |
|
c30c9b151 W1: fix deadlocks... |
1010 |
/* Set netlink removal messages and some cleanup */ |
7785925dd [PATCH] w1: clean... |
1011 |
list_for_each_entry(dev, &w1_masters, w1_master_entry) |
1da177e4c Linux-2.6.12-rc2 |
1012 |
__w1_remove_master_device(dev); |
1da177e4c Linux-2.6.12-rc2 |
1013 |
|
12003375a [PATCH] w1: Users... |
1014 |
w1_fini_netlink(); |
7f772ed8d [PATCH] w1: hotpl... |
1015 1016 |
driver_unregister(&w1_slave_driver); driver_unregister(&w1_master_driver); |
1da177e4c Linux-2.6.12-rc2 |
1017 1018 1019 1020 1021 |
bus_unregister(&w1_bus_type); } module_init(w1_init); module_exit(w1_fini); |