X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fw1%2Fw1.c;h=6dcffc7d13bd0245c997fbef9b332366adecd36f;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=8d7821899cc10440137299c7254ee4750c416d8d;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index 8d7821899..6dcffc7d1 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -1,8 +1,8 @@ /* - * w1.c + * w1.c * * Copyright (c) 2004 Evgeniy Polyakov - * + * * * 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 @@ -30,6 +30,7 @@ #include #include #include +#include #include @@ -45,19 +46,19 @@ MODULE_AUTHOR("Evgeniy Polyakov "); MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); static int w1_timeout = 10; +static int w1_control_timeout = 1; int w1_max_slave_count = 10; int w1_max_slave_ttl = 10; module_param_named(timeout, w1_timeout, int, 0); +module_param_named(control_timeout, w1_control_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); DEFINE_SPINLOCK(w1_mlock); LIST_HEAD(w1_masters); -static pid_t control_thread; -static int control_needs_exit; -static DECLARE_COMPLETION(w1_control_complete); +static struct task_struct *w1_control_thread; static int w1_master_match(struct device *dev, struct device_driver *drv) { @@ -69,156 +70,228 @@ static int w1_master_probe(struct device *dev) return -ENODEV; } -static int w1_master_remove(struct device *dev) -{ - return 0; -} - static void w1_master_release(struct device *dev) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); + + dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); - complete(&md->dev_released); + dev_fini_netlink(md); + memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); + kfree(md); } static void w1_slave_release(struct device *dev) { - struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + struct w1_slave *sl = dev_to_w1_slave(dev); + + dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name); + + while (atomic_read(&sl->refcnt)) { + dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n", + sl->name, atomic_read(&sl->refcnt)); + if (msleep_interruptible(1000)) + flush_signals(current); + } + + w1_family_put(sl->family); + sl->master->slave_count--; - complete(&sl->dev_released); + complete(&sl->released); } -static ssize_t w1_default_read_name(struct device *dev, char *buf) +static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "No family registered.\n"); + struct w1_slave *sl = dev_to_w1_slave(dev); + + return sprintf(buf, "%s\n", sl->name); } -static ssize_t w1_default_read_bin(struct kobject *kobj, char *buf, loff_t off, - size_t count) +static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, size_t count) { - return sprintf(buf, "No family registered.\n"); + struct w1_slave *sl = kobj_to_w1_slave(kobj); + + atomic_inc(&sl->refcnt); + if (off > 8) { + count = 0; + } else { + if (off + count > 8) + count = 8 - off; + + memcpy(buf, (u8 *)&sl->reg_num, count); + } + atomic_dec(&sl->refcnt); + + return count; } +static struct device_attribute w1_slave_attr_name = + __ATTR(name, S_IRUGO, w1_slave_read_name, NULL); + +static struct bin_attribute w1_slave_attr_bin_id = { + .attr = { + .name = "id", + .mode = S_IRUGO, + .owner = THIS_MODULE, + }, + .size = 8, + .read = w1_slave_read_id, +}; + +/* Default family */ +static struct w1_family w1_default_family; + +static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size); + static struct bus_type w1_bus_type = { .name = "w1", .match = w1_master_match, + .uevent = w1_uevent, }; -struct device_driver w1_driver = { - .name = "w1_driver", +struct device_driver w1_master_driver = { + .name = "w1_master_driver", .bus = &w1_bus_type, .probe = w1_master_probe, - .remove = w1_master_remove, }; -struct device w1_device = { +struct device w1_master_device = { .parent = NULL, .bus = &w1_bus_type, .bus_id = "w1 bus master", - .driver = &w1_driver, + .driver = &w1_master_driver, .release = &w1_master_release }; -static struct device_attribute w1_slave_attribute = { - .attr = { - .name = "name", - .mode = S_IRUGO, - .owner = THIS_MODULE - }, - .show = &w1_default_read_name, +static struct device_driver w1_slave_driver = { + .name = "w1_slave_driver", + .bus = &w1_bus_type, }; -static struct device_attribute w1_slave_attribute_val = { - .attr = { - .name = "value", - .mode = S_IRUGO, - .owner = THIS_MODULE - }, - .show = &w1_default_read_name, +#if 0 +struct device w1_slave_device = { + .parent = NULL, + .bus = &w1_bus_type, + .bus_id = "w1 bus slave", + .driver = &w1_slave_driver, + .release = &w1_slave_release }; +#endif /* 0 */ -static ssize_t w1_master_attribute_show_name(struct device *dev, char *buf) +static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of (dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; - + if (down_interruptible (&md->mutex)) return -EBUSY; count = sprintf(buf, "%s\n", md->name); - + up(&md->mutex); return count; } -static ssize_t w1_master_attribute_show_pointer(struct device *dev, char *buf) +static ssize_t w1_master_attribute_store_search(struct device * dev, + struct device_attribute *attr, + const char * buf, size_t count) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); + + if (down_interruptible (&md->mutex)) + return -EBUSY; + + md->search_count = simple_strtol(buf, NULL, 0); + + up(&md->mutex); + + return count; +} + +static ssize_t w1_master_attribute_show_search(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; - + + if (down_interruptible (&md->mutex)) + return -EBUSY; + + count = sprintf(buf, "%d\n", md->search_count); + + up(&md->mutex); + + return count; +} + +static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct w1_master *md = dev_to_w1_master(dev); + ssize_t count; + if (down_interruptible(&md->mutex)) return -EBUSY; count = sprintf(buf, "0x%p\n", md->bus_master); - + up(&md->mutex); return count; } -static ssize_t w1_master_attribute_show_timeout(struct device *dev, char *buf) +static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) { ssize_t count; count = sprintf(buf, "%d\n", w1_timeout); return count; } -static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, char *buf) +static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; - + if (down_interruptible(&md->mutex)) return -EBUSY; count = sprintf(buf, "%d\n", md->max_slave_count); - + up(&md->mutex); return count; } -static ssize_t w1_master_attribute_show_attempts(struct device *dev, char *buf) +static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; - + if (down_interruptible(&md->mutex)) return -EBUSY; count = sprintf(buf, "%lu\n", md->attempts); - + up(&md->mutex); return count; } -static ssize_t w1_master_attribute_show_slave_count(struct device *dev, char *buf) +static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); ssize_t count; - + if (down_interruptible(&md->mutex)) return -EBUSY; count = sprintf(buf, "%d\n", md->slave_count); - + up(&md->mutex); return count; } -static ssize_t w1_master_attribute_show_slaves(struct device *dev, char *buf) - +static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf) { - struct w1_master *md = container_of(dev, struct w1_master, dev); + struct w1_master *md = dev_to_w1_master(dev); int c = PAGE_SIZE; if (down_interruptible(&md->mutex)) @@ -233,7 +306,7 @@ static ssize_t w1_master_attribute_show_slaves(struct device *dev, char *buf) list_for_each_safe(ent, n, &md->slist) { sl = list_entry(ent, struct w1_slave, w1_slave_entry); - c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); + c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); } } @@ -242,144 +315,164 @@ static ssize_t w1_master_attribute_show_slaves(struct device *dev, char *buf) return PAGE_SIZE - c; } -static struct device_attribute w1_master_attribute_slaves = { - .attr = { - .name = "w1_master_slaves", - .mode = S_IRUGO, - .owner = THIS_MODULE, - }, - .show = &w1_master_attribute_show_slaves, -}; -static struct device_attribute w1_master_attribute_slave_count = { - .attr = { - .name = "w1_master_slave_count", - .mode = S_IRUGO, - .owner = THIS_MODULE - }, - .show = &w1_master_attribute_show_slave_count, -}; -static struct device_attribute w1_master_attribute_attempts = { - .attr = { - .name = "w1_master_attempts", - .mode = S_IRUGO, - .owner = THIS_MODULE - }, - .show = &w1_master_attribute_show_attempts, -}; -static struct device_attribute w1_master_attribute_max_slave_count = { - .attr = { - .name = "w1_master_max_slave_count", - .mode = S_IRUGO, - .owner = THIS_MODULE - }, - .show = &w1_master_attribute_show_max_slave_count, +#define W1_MASTER_ATTR_RO(_name, _mode) \ + struct device_attribute w1_master_attribute_##_name = \ + __ATTR(w1_master_##_name, _mode, \ + w1_master_attribute_show_##_name, NULL) + +#define W1_MASTER_ATTR_RW(_name, _mode) \ + struct device_attribute w1_master_attribute_##_name = \ + __ATTR(w1_master_##_name, _mode, \ + w1_master_attribute_show_##_name, \ + w1_master_attribute_store_##_name) + +static W1_MASTER_ATTR_RO(name, S_IRUGO); +static W1_MASTER_ATTR_RO(slaves, S_IRUGO); +static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); +static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO); +static W1_MASTER_ATTR_RO(attempts, S_IRUGO); +static W1_MASTER_ATTR_RO(timeout, S_IRUGO); +static W1_MASTER_ATTR_RO(pointer, S_IRUGO); +static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO); + +static struct attribute *w1_master_default_attrs[] = { + &w1_master_attribute_name.attr, + &w1_master_attribute_slaves.attr, + &w1_master_attribute_slave_count.attr, + &w1_master_attribute_max_slave_count.attr, + &w1_master_attribute_attempts.attr, + &w1_master_attribute_timeout.attr, + &w1_master_attribute_pointer.attr, + &w1_master_attribute_search.attr, + NULL }; -static struct device_attribute w1_master_attribute_timeout = { - .attr = { - .name = "w1_master_timeout", - .mode = S_IRUGO, - .owner = THIS_MODULE - }, - .show = &w1_master_attribute_show_timeout, -}; -static struct device_attribute w1_master_attribute_pointer = { - .attr = { - .name = "w1_master_pointer", - .mode = S_IRUGO, - .owner = THIS_MODULE - }, - .show = &w1_master_attribute_show_pointer, -}; -static struct device_attribute w1_master_attribute_name = { - .attr = { - .name = "w1_master_name", - .mode = S_IRUGO, - .owner = THIS_MODULE - }, - .show = &w1_master_attribute_show_name, + +static struct attribute_group w1_master_defattr_group = { + .attrs = w1_master_default_attrs, }; -static struct bin_attribute w1_slave_bin_attribute = { - .attr = { - .name = "w1_slave", - .mode = S_IRUGO, - .owner = THIS_MODULE, - }, - .size = W1_SLAVE_DATA_SIZE, - .read = &w1_default_read_bin, +int w1_create_master_attributes(struct w1_master *master) +{ + return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); +} + +static void w1_destroy_master_attributes(struct w1_master *master) +{ + sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); +} + +#ifdef CONFIG_HOTPLUG +static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) +{ + struct w1_master *md = NULL; + struct w1_slave *sl = NULL; + char *event_owner, *name; + int err, cur_index=0, cur_len=0; + + 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 { + dev_dbg(dev, "Unknown event.\n"); + return -EINVAL; + } + + dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", event_owner, name, dev->bus_id); + + 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); + 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); + if (err) + return err; + + return 0; }; +#else +static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) +{ + return 0; +} +#endif static int __w1_attach_slave_device(struct w1_slave *sl) { int err; sl->dev.parent = &sl->master->dev; - sl->dev.driver = sl->master->driver; + sl->dev.driver = &w1_slave_driver; sl->dev.bus = &w1_bus_type; sl->dev.release = &w1_slave_release; snprintf(&sl->dev.bus_id[0], sizeof(sl->dev.bus_id), - "%02x-%012llx", - (unsigned int) sl->reg_num.family, - (unsigned long long) sl->reg_num.id); - snprintf (&sl->name[0], sizeof(sl->name), - "%02x-%012llx", - (unsigned int) sl->reg_num.family, - (unsigned long long) sl->reg_num.id); + "%02x-%012llx", + (unsigned int) sl->reg_num.family, + (unsigned long long) sl->reg_num.id); + snprintf(&sl->name[0], sizeof(sl->name), + "%02x-%012llx", + (unsigned int) sl->reg_num.family, + (unsigned long long) sl->reg_num.id); - dev_dbg(&sl->dev, "%s: registering %s.\n", __func__, - &sl->dev.bus_id[0]); + dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, &sl->dev.bus_id[0]); err = device_register(&sl->dev); if (err < 0) { dev_err(&sl->dev, - "Device registration [%s] failed. err=%d\n", - sl->dev.bus_id, err); + "Device registration [%s] failed. err=%d\n", + sl->dev.bus_id, err); return err; } - memcpy(&sl->attr_bin, &w1_slave_bin_attribute, sizeof(sl->attr_bin)); - memcpy(&sl->attr_name, &w1_slave_attribute, sizeof(sl->attr_name)); - memcpy(&sl->attr_val, &w1_slave_attribute_val, sizeof(sl->attr_val)); - - sl->attr_bin.read = sl->family->fops->rbin; - sl->attr_name.show = sl->family->fops->rname; - sl->attr_val.show = sl->family->fops->rval; - sl->attr_val.attr.name = sl->family->fops->rvalname; - - err = device_create_file(&sl->dev, &sl->attr_name); + /* 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\n", - sl->dev.bus_id, err); - device_unregister(&sl->dev); - return err; + "sysfs file creation for [%s] failed. err=%d\n", + sl->dev.bus_id, err); + goto out_unreg; } - err = device_create_file(&sl->dev, &sl->attr_val); + /* Create "id" entry */ + err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); if (err < 0) { dev_err(&sl->dev, - "sysfs file creation for [%s] failed. err=%d\n", - sl->dev.bus_id, err); - device_remove_file(&sl->dev, &sl->attr_name); - device_unregister(&sl->dev); - return err; + "sysfs file creation for [%s] failed. err=%d\n", + sl->dev.bus_id, err); + goto out_rem1; } - err = sysfs_create_bin_file(&sl->dev.kobj, &sl->attr_bin); - if (err < 0) { + /* 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\n", - sl->dev.bus_id, err); - device_remove_file(&sl->dev, &sl->attr_name); - device_remove_file(&sl->dev, &sl->attr_val); - device_unregister(&sl->dev); - return err; + "sysfs file creation for [%s] failed. err=%d\n", + sl->dev.bus_id, err); + goto out_rem2; } list_add_tail(&sl->w1_slave_entry, &sl->master->slist); return 0; + +out_rem2: + sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); +out_rem1: + device_remove_file(&sl->dev, &w1_slave_attr_name); +out_unreg: + device_unregister(&sl->dev); + return err; } static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) @@ -405,17 +498,15 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); atomic_set(&sl->refcnt, 0); - init_completion(&sl->dev_released); + init_completion(&sl->released); spin_lock(&w1_flock); f = w1_family_registered(rn->family); if (!f) { - spin_unlock(&w1_flock); + f= &w1_default_family; dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", rn->family, rn->family, (unsigned long long)rn->id, rn->crc); - kfree(sl); - return -ENODEV; } __w1_family_get(f); spin_unlock(&w1_flock); @@ -445,34 +536,32 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) static void w1_slave_detach(struct w1_slave *sl) { struct w1_netlink_msg msg; - - dev_info(&sl->dev, "%s: detaching %s.\n", __func__, sl->name); - while (atomic_read(&sl->refcnt)) { - printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n", - sl->name, atomic_read(&sl->refcnt)); + dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl); - if (msleep_interruptible(1000)) - flush_signals(current); - } + list_del(&sl->w1_slave_entry); - sysfs_remove_bin_file (&sl->dev.kobj, &sl->attr_bin); - device_remove_file(&sl->dev, &sl->attr_name); - device_remove_file(&sl->dev, &sl->attr_val); - device_unregister(&sl->dev); - w1_family_put(sl->family); + 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)); msg.type = W1_SLAVE_REMOVE; w1_netlink_send(sl->master, &msg); + + sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id); + device_remove_file(&sl->dev, &w1_slave_attr_name); + device_unregister(&sl->dev); + + wait_for_completion(&sl->released); + kfree(sl); } -static struct w1_master *w1_search_master(unsigned long data) +static struct w1_master *w1_search_master(void *data) { struct w1_master *dev; int found = 0; - - spin_lock_irq(&w1_mlock); + + spin_lock_bh(&w1_mlock); list_for_each_entry(dev, &w1_masters, w1_master_entry) { if (dev->bus_master->data == data) { found = 1; @@ -480,12 +569,25 @@ static struct w1_master *w1_search_master(unsigned long data) break; } } - spin_unlock_irq(&w1_mlock); + spin_unlock_bh(&w1_mlock); return (found)?dev:NULL; } -void w1_slave_found(unsigned long data, u64 rn) +void w1_reconnect_slaves(struct w1_family *f) +{ + struct w1_master *dev; + + spin_lock_bh(&w1_mlock); + list_for_each_entry(dev, &w1_masters, w1_master_entry) { + dev_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); +} + +static void w1_slave_found(void *data, u64 rn) { int slave_count; struct w1_slave *sl; @@ -493,14 +595,15 @@ void w1_slave_found(unsigned long data, u64 rn) struct w1_reg_num *tmp; int family_found = 0; struct w1_master *dev; + u64 rn_le = cpu_to_le64(rn); dev = w1_search_master(data); if (!dev) { - printk(KERN_ERR "Failed to find w1 master device for data %08lx, it is impossible.\n", - data); + printk(KERN_ERR "Failed to find w1 master device for data %p, " + "it is impossible.\n", data); return; } - + tmp = (struct w1_reg_num *) &rn; slave_count = 0; @@ -513,8 +616,7 @@ void w1_slave_found(unsigned long data, u64 rn) sl->reg_num.crc == tmp->crc) { set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); break; - } - else if (sl->reg_num.family == tmp->family) { + } else if (sl->reg_num.family == tmp->family) { family_found = 1; break; } @@ -522,36 +624,47 @@ void w1_slave_found(unsigned long data, u64 rn) slave_count++; } - rn = cpu_to_le64(rn); - if (slave_count == dev->slave_count && - rn && ((le64_to_cpu(rn) >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn, 7)) { + rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) { w1_attach_slave_device(dev, tmp); } - + atomic_dec(&dev->refcnt); } -void w1_search(struct w1_master *dev) +/** + * Performs a ROM Search & registers any devices found. + * The 1-wire search is a simple binary tree search. + * For each bit of the address, we read two bits and write one bit. + * The bit written will put to sleep all devies that don't match that bit. + * When the two reads differ, the direction choice is obvious. + * When both bits are 0, we must choose a path to take. + * When we can scan all 64 bits without having to choose a path, we are done. + * + * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com + * + * @dev The master device to search + * @cb Function to call when a device is found + */ +void w1_search(struct w1_master *dev, w1_slave_found_callback cb) { - u64 last, rn, tmp; - int i, count = 0; - int last_family_desc, last_zero, last_device; - int search_bit, id_bit, comp_bit, desc_bit; + u64 last_rn, rn, tmp64; + int i, slave_count = 0; + int last_zero, last_device; + int search_bit, desc_bit; + u8 triplet_ret = 0; - search_bit = id_bit = comp_bit = 0; - rn = tmp = last = 0; - last_device = last_zero = last_family_desc = 0; + search_bit = 0; + rn = last_rn = 0; + last_device = 0; + last_zero = -1; desc_bit = 64; - while (!(id_bit && comp_bit) && !last_device - && count++ < dev->max_slave_count) { - last = rn; + while ( !last_device && (slave_count++ < dev->max_slave_count) ) { + last_rn = rn; rn = 0; - last_family_desc = 0; - /* * Reset bus and all 1-wire device state machines * so they can respond to our requests. @@ -559,116 +672,60 @@ void w1_search(struct w1_master *dev) * Return 0 - device(s) present, 1 - no devices present. */ if (w1_reset_bus(dev)) { - dev_info(&dev->dev, "No devices present on the wire.\n"); + //dev_dbg(&dev->dev, "No devices present on the wire.\n"); break; } -#if 1 + /* Start the search */ w1_write_8(dev, W1_SEARCH); for (i = 0; i < 64; ++i) { - /* - * Read 2 bits from bus. - * All who don't sleep must send ID bit and COMPLEMENT ID bit. - * They actually are ANDed between all senders. - */ - id_bit = w1_touch_bit(dev, 1); - comp_bit = w1_touch_bit(dev, 1); - - if (id_bit && comp_bit) - break; - - if (id_bit == 0 && comp_bit == 0) { - if (i == desc_bit) - search_bit = 1; - else if (i > desc_bit) - search_bit = 0; - else - search_bit = ((last >> i) & 0x1); - - if (search_bit == 0) { - last_zero = i; - if (last_zero < 9) - last_family_desc = last_zero; - } - - } + /* Determine the direction/search bit */ + if (i == desc_bit) + search_bit = 1; /* took the 0 path last time, so take the 1 path */ + else if (i > desc_bit) + search_bit = 0; /* take the 0 path on the next branch */ else - search_bit = id_bit; + search_bit = ((last_rn >> i) & 0x1); - tmp = search_bit; - rn |= (tmp << i); + /** Read two bits and write one bit */ + triplet_ret = w1_triplet(dev, search_bit); - /* - * Write 1 bit to bus - * and make all who don't have "search_bit" in "i"'th position - * in it's registration number sleep. - */ - if (dev->bus_master->touch_bit) - w1_touch_bit(dev, search_bit); - else - w1_write_bit(dev, search_bit); + /* quit if no device responded */ + if ( (triplet_ret & 0x03) == 0x03 ) + break; - } -#endif + /* If both directions were valid, and we took the 0 path... */ + if (triplet_ret == 0) + last_zero = i; - if (desc_bit == last_zero) - last_device = 1; + /* extract the direction taken & update the device number */ + tmp64 = (triplet_ret >> 2); + rn |= (tmp64 << i); + } - desc_bit = last_zero; - - w1_slave_found(dev->bus_master->data, rn); + if ( (triplet_ret & 0x03) != 0x03 ) { + if ( (desc_bit == last_zero) || (last_zero < 0)) + last_device = 1; + desc_bit = last_zero; + cb(dev->bus_master->data, rn); + } } } -int w1_create_master_attributes(struct w1_master *dev) +static int w1_control(void *data) { - if ( device_create_file(&dev->dev, &w1_master_attribute_slaves) < 0 || - device_create_file(&dev->dev, &w1_master_attribute_slave_count) < 0 || - device_create_file(&dev->dev, &w1_master_attribute_attempts) < 0 || - device_create_file(&dev->dev, &w1_master_attribute_max_slave_count) < 0 || - device_create_file(&dev->dev, &w1_master_attribute_timeout) < 0|| - device_create_file(&dev->dev, &w1_master_attribute_pointer) < 0|| - device_create_file(&dev->dev, &w1_master_attribute_name) < 0) - return -EINVAL; + struct w1_slave *sl, *sln; + struct w1_master *dev, *n; + int have_to_wait = 0; - return 0; -} - -void w1_destroy_master_attributes(struct w1_master *dev) -{ - device_remove_file(&dev->dev, &w1_master_attribute_slaves); - device_remove_file(&dev->dev, &w1_master_attribute_slave_count); - device_remove_file(&dev->dev, &w1_master_attribute_attempts); - device_remove_file(&dev->dev, &w1_master_attribute_max_slave_count); - device_remove_file(&dev->dev, &w1_master_attribute_timeout); - device_remove_file(&dev->dev, &w1_master_attribute_pointer); - device_remove_file(&dev->dev, &w1_master_attribute_name); -} - - -int w1_control(void *data) -{ - struct w1_slave *sl; - struct w1_master *dev; - struct list_head *ent, *ment, *n, *mn; - int err, have_to_wait = 0; - - daemonize("w1_control"); - allow_signal(SIGTERM); - - while (!control_needs_exit || have_to_wait) { + while (!kthread_should_stop() || have_to_wait) { have_to_wait = 0; - try_to_freeze(PF_FREEZE); - msleep_interruptible(w1_timeout * 1000); - - if (signal_pending(current)) - flush_signals(current); + try_to_freeze(); + msleep_interruptible(w1_control_timeout * 1000); - list_for_each_safe(ment, mn, &w1_masters) { - dev = list_entry(ment, struct w1_master, w1_master_entry); - - if (!control_needs_exit && !dev->need_exit) + list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) { + if (!kthread_should_stop() && !dev->flags) continue; /* * Little race: we can create thread but not set the flag. @@ -679,102 +736,93 @@ int w1_control(void *data) continue; } - spin_lock(&w1_mlock); - list_del(&dev->w1_master_entry); - spin_unlock(&w1_mlock); + if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { + set_bit(W1_MASTER_NEED_EXIT, &dev->flags); - if (control_needs_exit) { - dev->need_exit = 1; + spin_lock(&w1_mlock); + list_del(&dev->w1_master_entry); + spin_unlock(&w1_mlock); - err = kill_proc(dev->kpid, SIGTERM, 1); - if (err) - dev_err(&dev->dev, - "Failed to send signal to w1 kernel thread %d.\n", - dev->kpid); + down(&dev->mutex); + list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { + w1_slave_detach(sl); + } + w1_destroy_master_attributes(dev); + up(&dev->mutex); + atomic_dec(&dev->refcnt); + continue; } - wait_for_completion(&dev->dev_exited); - - list_for_each_safe(ent, n, &dev->slist) { - sl = list_entry(ent, struct w1_slave, w1_slave_entry); + if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) { + dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name); + down(&dev->mutex); + list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { + if (sl->family->fid == W1_FAMILY_DEFAULT) { + struct w1_reg_num rn; - if (!sl) - dev_warn(&dev->dev, - "%s: slave entry is NULL.\n", - __func__); - else { - list_del(&sl->w1_slave_entry); + memcpy(&rn, &sl->reg_num, sizeof(rn)); + w1_slave_detach(sl); - w1_slave_detach(sl); - kfree(sl); + w1_attach_slave_device(dev, &rn); + } } + dev_dbg(&dev->dev, "Reconnecting slaves in device %s has been finished.\n", dev->name); + clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags); + up(&dev->mutex); } - w1_destroy_master_attributes(dev); - atomic_dec(&dev->refcnt); } } - complete_and_exit(&w1_control_complete, 0); + return 0; } int w1_process(void *data) { struct w1_master *dev = (struct w1_master *) data; - struct list_head *ent, *n; - struct w1_slave *sl; + struct w1_slave *sl, *sln; - daemonize("%s", dev->name); - allow_signal(SIGTERM); - - while (!dev->need_exit) { - try_to_freeze(PF_FREEZE); + while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { + try_to_freeze(); msleep_interruptible(w1_timeout * 1000); - if (signal_pending(current)) - flush_signals(current); - - if (dev->need_exit) + if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) break; if (!dev->initialized) continue; + if (dev->search_count == 0) + continue; + if (down_interruptible(&dev->mutex)) continue; - list_for_each_safe(ent, n, &dev->slist) { - sl = list_entry(ent, struct w1_slave, w1_slave_entry); + list_for_each_entry(sl, &dev->slist, w1_slave_entry) + clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); - if (sl) - clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags); - } - w1_search_devices(dev, w1_slave_found); - list_for_each_safe(ent, n, &dev->slist) { - sl = list_entry(ent, struct w1_slave, w1_slave_entry); - - if (sl && !test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) { - list_del (&sl->w1_slave_entry); - - w1_slave_detach (sl); - kfree (sl); + 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)) + } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags)) sl->ttl = dev->slave_ttl; } + + if (dev->search_count > 0) + dev->search_count--; + up(&dev->mutex); } atomic_dec(&dev->refcnt); - complete_and_exit(&dev->dev_exited, 0); return 0; } -int w1_init(void) +static int w1_init(void) { int retval; @@ -786,7 +834,7 @@ int w1_init(void) goto err_out_exit_init; } - retval = driver_register(&w1_driver); + retval = driver_register(&w1_master_driver); if (retval) { printk(KERN_ERR "Failed to register master driver. err=%d.\n", @@ -794,18 +842,29 @@ int w1_init(void) goto err_out_bus_unregister; } - control_thread = kernel_thread(&w1_control, NULL, 0); - if (control_thread < 0) { + retval = driver_register(&w1_slave_driver); + if (retval) { + printk(KERN_ERR + "Failed to register master driver. err=%d.\n", + retval); + goto err_out_master_unregister; + } + + w1_control_thread = kthread_run(w1_control, NULL, "w1_control"); + if (IS_ERR(w1_control_thread)) { + retval = PTR_ERR(w1_control_thread); printk(KERN_ERR "Failed to create control thread. err=%d\n", - control_thread); - retval = control_thread; - goto err_out_driver_unregister; + retval); + goto err_out_slave_unregister; } return 0; -err_out_driver_unregister: - driver_unregister(&w1_driver); +err_out_slave_unregister: + driver_unregister(&w1_slave_driver); + +err_out_master_unregister: + driver_unregister(&w1_master_driver); err_out_bus_unregister: bus_unregister(&w1_bus_type); @@ -814,21 +873,17 @@ err_out_exit_init: return retval; } -void w1_fini(void) +static void w1_fini(void) { struct w1_master *dev; - struct list_head *ent, *n; - list_for_each_safe(ent, n, &w1_masters) { - dev = list_entry(ent, struct w1_master, w1_master_entry); + list_for_each_entry(dev, &w1_masters, w1_master_entry) __w1_remove_master_device(dev); - } - - control_needs_exit = 1; - wait_for_completion(&w1_control_complete); + kthread_stop(w1_control_thread); - driver_unregister(&w1_driver); + driver_unregister(&w1_slave_driver); + driver_unregister(&w1_master_driver); bus_unregister(&w1_bus_type); }