Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Evgeniy Polyakov | a801876 | 2011-08-25 15:59:06 -0700 | [diff] [blame] | 2 | * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net> |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | */ |
| 14 | |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/moduleparam.h> |
| 19 | #include <linux/list.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/spinlock.h> |
| 22 | #include <linux/timer.h> |
| 23 | #include <linux/device.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/sched.h> |
Evgeniy Polyakov | 674a396c | 2006-02-20 11:15:37 +0300 | [diff] [blame] | 26 | #include <linux/kthread.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 27 | #include <linux/freezer.h> |
Jaghathiswari Rankappagounder Natarajan | 2eb7954 | 2017-08-30 16:34:33 -0700 | [diff] [blame] | 28 | #include <linux/hwmon.h> |
Daniel Mack | fae6803 | 2018-07-06 07:35:50 +0200 | [diff] [blame] | 29 | #include <linux/of.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 31 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Andrew F. Davis | de0d6db | 2017-06-05 08:52:08 -0500 | [diff] [blame] | 33 | #include "w1_internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include "w1_netlink.h" |
| 35 | |
Andrew F. Davis | de0d6db | 2017-06-05 08:52:08 -0500 | [diff] [blame] | 36 | #define W1_FAMILY_DEFAULT 0 |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | static int w1_timeout = 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | module_param_named(timeout, w1_timeout, int, 0); |
David Fries | b3be177 | 2014-01-15 22:29:25 -0600 | [diff] [blame] | 40 | MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches"); |
Andrew F. Davis | 50fa295 | 2017-05-16 15:02:12 -0500 | [diff] [blame] | 41 | |
| 42 | static int w1_timeout_us = 0; |
Dmitry Khromov | c309835 | 2015-05-12 22:29:44 +0300 | [diff] [blame] | 43 | module_param_named(timeout_us, w1_timeout_us, int, 0); |
Wei Yongjun | a46b195 | 2016-08-08 13:52:41 +0000 | [diff] [blame] | 44 | MODULE_PARM_DESC(timeout_us, |
| 45 | "time in microseconds between automatic slave searches"); |
Andrew F. Davis | 50fa295 | 2017-05-16 15:02:12 -0500 | [diff] [blame] | 46 | |
David Fries | b3be177 | 2014-01-15 22:29:25 -0600 | [diff] [blame] | 47 | /* A search stops when w1_max_slave_count devices have been found in that |
| 48 | * search. The next search will start over and detect the same set of devices |
| 49 | * on a static 1-wire bus. Memory is not allocated based on this number, just |
| 50 | * on the number of devices known to the kernel. Having a high number does not |
| 51 | * consume additional resources. As a special case, if there is only one |
| 52 | * device on the network and w1_max_slave_count is set to 1, the device id can |
| 53 | * be read directly skipping the normal slower search process. |
| 54 | */ |
Andrew F. Davis | 50fa295 | 2017-05-16 15:02:12 -0500 | [diff] [blame] | 55 | int w1_max_slave_count = 64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | module_param_named(max_slave_count, w1_max_slave_count, int, 0); |
David Fries | b3be177 | 2014-01-15 22:29:25 -0600 | [diff] [blame] | 57 | MODULE_PARM_DESC(max_slave_count, |
| 58 | "maximum number of slaves detected in a search"); |
Andrew F. Davis | 50fa295 | 2017-05-16 15:02:12 -0500 | [diff] [blame] | 59 | |
| 60 | int w1_max_slave_ttl = 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); |
David Fries | b3be177 | 2014-01-15 22:29:25 -0600 | [diff] [blame] | 62 | MODULE_PARM_DESC(slave_ttl, |
| 63 | "Number of searches not seeing a slave before it will be removed"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 65 | DEFINE_MUTEX(w1_mlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | LIST_HEAD(w1_masters); |
| 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | static int w1_master_match(struct device *dev, struct device_driver *drv) |
| 69 | { |
| 70 | return 1; |
| 71 | } |
| 72 | |
| 73 | static int w1_master_probe(struct device *dev) |
| 74 | { |
| 75 | return -ENODEV; |
| 76 | } |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | static void w1_master_release(struct device *dev) |
| 79 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 80 | struct w1_master *md = dev_to_w1_master(dev); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 81 | |
| 82 | dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 83 | memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master)); |
| 84 | kfree(md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static void w1_slave_release(struct device *dev) |
| 88 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 89 | struct w1_slave *sl = dev_to_w1_slave(dev); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 90 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 91 | dev_dbg(dev, "%s: Releasing %s [%p]\n", __func__, sl->name, sl); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 92 | |
| 93 | w1_family_put(sl->family); |
| 94 | sl->master->slave_count--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | } |
| 96 | |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 97 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 99 | struct w1_slave *sl = dev_to_w1_slave(dev); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 100 | |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 101 | return sprintf(buf, "%s\n", sl->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | } |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 103 | static DEVICE_ATTR_RO(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 105 | static ssize_t id_show(struct device *dev, |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 106 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 108 | struct w1_slave *sl = dev_to_w1_slave(dev); |
| 109 | ssize_t count = sizeof(sl->reg_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
David Fries | 07e0034 | 2008-10-15 22:04:50 -0700 | [diff] [blame] | 111 | memcpy(buf, (u8 *)&sl->reg_num, count); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 112 | return count; |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 113 | } |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 114 | static DEVICE_ATTR_RO(id); |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 115 | |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 116 | static struct attribute *w1_slave_attrs[] = { |
| 117 | &dev_attr_name.attr, |
| 118 | &dev_attr_id.attr, |
| 119 | NULL, |
| 120 | }; |
| 121 | ATTRIBUTE_GROUPS(w1_slave); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 122 | |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 123 | /* Default family */ |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 124 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 125 | static ssize_t rw_write(struct file *filp, struct kobject *kobj, |
| 126 | struct bin_attribute *bin_attr, char *buf, loff_t off, |
| 127 | size_t count) |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 128 | { |
| 129 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
| 130 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 131 | mutex_lock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 132 | if (w1_reset_select_slave(sl)) { |
| 133 | count = 0; |
| 134 | goto out_up; |
| 135 | } |
| 136 | |
| 137 | w1_write_block(sl->master, buf, count); |
| 138 | |
| 139 | out_up: |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 140 | mutex_unlock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 141 | return count; |
| 142 | } |
| 143 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 144 | static ssize_t rw_read(struct file *filp, struct kobject *kobj, |
| 145 | struct bin_attribute *bin_attr, char *buf, loff_t off, |
| 146 | size_t count) |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 147 | { |
| 148 | struct w1_slave *sl = kobj_to_w1_slave(kobj); |
| 149 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 150 | mutex_lock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 151 | w1_read_block(sl->master, buf, count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 152 | mutex_unlock(&sl->master->mutex); |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 153 | return count; |
| 154 | } |
| 155 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 156 | static BIN_ATTR_RW(rw, PAGE_SIZE); |
| 157 | |
| 158 | static struct bin_attribute *w1_slave_bin_attrs[] = { |
| 159 | &bin_attr_rw, |
| 160 | NULL, |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 161 | }; |
| 162 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 163 | static const struct attribute_group w1_slave_default_group = { |
| 164 | .bin_attrs = w1_slave_bin_attrs, |
| 165 | }; |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 166 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 167 | static const struct attribute_group *w1_slave_default_groups[] = { |
| 168 | &w1_slave_default_group, |
| 169 | NULL, |
| 170 | }; |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 171 | |
| 172 | static struct w1_family_ops w1_default_fops = { |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 173 | .groups = w1_slave_default_groups, |
Evgeniy Polyakov | f522d23 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 174 | }; |
| 175 | |
| 176 | static struct w1_family w1_default_family = { |
| 177 | .fops = &w1_default_fops, |
| 178 | }; |
Evgeniy Polyakov | d2a4ef6 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 179 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 180 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | static struct bus_type w1_bus_type = { |
| 183 | .name = "w1", |
| 184 | .match = w1_master_match, |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 185 | .uevent = w1_uevent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | }; |
| 187 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 188 | struct device_driver w1_master_driver = { |
| 189 | .name = "w1_master_driver", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | .bus = &w1_bus_type, |
| 191 | .probe = w1_master_probe, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | }; |
| 193 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 194 | struct device w1_master_device = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | .parent = NULL, |
| 196 | .bus = &w1_bus_type, |
Kay Sievers | 40f91de6 | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 197 | .init_name = "w1 bus master", |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 198 | .driver = &w1_master_driver, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | .release = &w1_master_release |
| 200 | }; |
| 201 | |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 202 | static struct device_driver w1_slave_driver = { |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 203 | .name = "w1_slave_driver", |
| 204 | .bus = &w1_bus_type, |
| 205 | }; |
| 206 | |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 207 | #if 0 |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 208 | struct device w1_slave_device = { |
| 209 | .parent = NULL, |
| 210 | .bus = &w1_bus_type, |
Kay Sievers | 40f91de6 | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 211 | .init_name = "w1 bus slave", |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 212 | .driver = &w1_slave_driver, |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 213 | .release = &w1_slave_release |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 214 | }; |
Evgeniy Polyakov | 2c5bfda | 2006-04-04 20:35:22 +0400 | [diff] [blame] | 215 | #endif /* 0 */ |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 216 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 217 | static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 219 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 221 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 222 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | count = sprintf(buf, "%s\n", md->name); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 224 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
| 226 | return count; |
| 227 | } |
| 228 | |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 229 | static ssize_t w1_master_attribute_store_search(struct device * dev, |
| 230 | struct device_attribute *attr, |
| 231 | const char * buf, size_t count) |
| 232 | { |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 233 | long tmp; |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 234 | struct w1_master *md = dev_to_w1_master(dev); |
Jingoo Han | bf4228f | 2013-09-11 14:26:03 -0700 | [diff] [blame] | 235 | int ret; |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 236 | |
Jingoo Han | bf4228f | 2013-09-11 14:26:03 -0700 | [diff] [blame] | 237 | ret = kstrtol(buf, 0, &tmp); |
| 238 | if (ret) |
| 239 | return ret; |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 240 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 241 | mutex_lock(&md->mutex); |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 242 | md->search_count = tmp; |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 243 | mutex_unlock(&md->mutex); |
David Fries | af8c723 | 2014-01-15 22:29:14 -0600 | [diff] [blame] | 244 | /* Only wake if it is going to be searching. */ |
| 245 | if (tmp) |
| 246 | wake_up_process(md->thread); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 247 | |
| 248 | return count; |
| 249 | } |
| 250 | |
| 251 | static ssize_t w1_master_attribute_show_search(struct device *dev, |
| 252 | struct device_attribute *attr, |
| 253 | char *buf) |
| 254 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 255 | struct w1_master *md = dev_to_w1_master(dev); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 256 | ssize_t count; |
| 257 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 258 | mutex_lock(&md->mutex); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 259 | count = sprintf(buf, "%d\n", md->search_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 260 | mutex_unlock(&md->mutex); |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 261 | |
| 262 | return count; |
| 263 | } |
| 264 | |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 265 | static ssize_t w1_master_attribute_store_pullup(struct device *dev, |
| 266 | struct device_attribute *attr, |
| 267 | const char *buf, size_t count) |
| 268 | { |
| 269 | long tmp; |
| 270 | struct w1_master *md = dev_to_w1_master(dev); |
Jingoo Han | bf4228f | 2013-09-11 14:26:03 -0700 | [diff] [blame] | 271 | int ret; |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 272 | |
Jingoo Han | bf4228f | 2013-09-11 14:26:03 -0700 | [diff] [blame] | 273 | ret = kstrtol(buf, 0, &tmp); |
| 274 | if (ret) |
| 275 | return ret; |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 276 | |
| 277 | mutex_lock(&md->mutex); |
| 278 | md->enable_pullup = tmp; |
| 279 | mutex_unlock(&md->mutex); |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 280 | |
| 281 | return count; |
| 282 | } |
| 283 | |
| 284 | static ssize_t w1_master_attribute_show_pullup(struct device *dev, |
| 285 | struct device_attribute *attr, |
| 286 | char *buf) |
| 287 | { |
| 288 | struct w1_master *md = dev_to_w1_master(dev); |
| 289 | ssize_t count; |
| 290 | |
| 291 | mutex_lock(&md->mutex); |
| 292 | count = sprintf(buf, "%d\n", md->enable_pullup); |
| 293 | mutex_unlock(&md->mutex); |
| 294 | |
| 295 | return count; |
| 296 | } |
| 297 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 298 | static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 300 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 302 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 303 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | count = sprintf(buf, "0x%p\n", md->bus_master); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 305 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | return count; |
| 307 | } |
| 308 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 309 | static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | { |
| 311 | ssize_t count; |
| 312 | count = sprintf(buf, "%d\n", w1_timeout); |
| 313 | return count; |
| 314 | } |
| 315 | |
Dmitry Khromov | c309835 | 2015-05-12 22:29:44 +0300 | [diff] [blame] | 316 | static ssize_t w1_master_attribute_show_timeout_us(struct device *dev, |
| 317 | struct device_attribute *attr, char *buf) |
| 318 | { |
| 319 | ssize_t count; |
| 320 | count = sprintf(buf, "%d\n", w1_timeout_us); |
| 321 | return count; |
| 322 | } |
| 323 | |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 324 | static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev, |
| 325 | struct device_attribute *attr, const char *buf, size_t count) |
| 326 | { |
Dan Carpenter | a7155f4 | 2014-02-12 00:07:55 +0300 | [diff] [blame] | 327 | int tmp; |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 328 | struct w1_master *md = dev_to_w1_master(dev); |
| 329 | |
Dan Carpenter | b9c11a2 | 2016-04-14 12:35:48 +0300 | [diff] [blame] | 330 | if (kstrtoint(buf, 0, &tmp) || tmp < 1) |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 331 | return -EINVAL; |
| 332 | |
| 333 | mutex_lock(&md->mutex); |
| 334 | md->max_slave_count = tmp; |
| 335 | /* allow each time the max_slave_count is updated */ |
| 336 | clear_bit(W1_WARN_MAX_COUNT, &md->flags); |
| 337 | mutex_unlock(&md->mutex); |
| 338 | |
| 339 | return count; |
| 340 | } |
| 341 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 342 | static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 344 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 346 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 347 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | count = sprintf(buf, "%d\n", md->max_slave_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 349 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | return count; |
| 351 | } |
| 352 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 353 | static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 355 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 357 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 358 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | count = sprintf(buf, "%lu\n", md->attempts); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 360 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | return count; |
| 362 | } |
| 363 | |
Yani Ioannou | 060b884 | 2005-05-17 06:44:04 -0400 | [diff] [blame] | 364 | static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 366 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | ssize_t count; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 368 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 369 | mutex_lock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | count = sprintf(buf, "%d\n", md->slave_count); |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 371 | mutex_unlock(&md->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | return count; |
| 373 | } |
| 374 | |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 375 | static ssize_t w1_master_attribute_show_slaves(struct device *dev, |
| 376 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | { |
Evgeniy Polyakov | db2d000 | 2005-08-11 17:27:49 +0400 | [diff] [blame] | 378 | struct w1_master *md = dev_to_w1_master(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | int c = PAGE_SIZE; |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 380 | struct list_head *ent, *n; |
| 381 | struct w1_slave *sl = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 383 | mutex_lock(&md->list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 385 | list_for_each_safe(ent, n, &md->slist) { |
| 386 | sl = list_entry(ent, struct w1_slave, w1_slave_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 388 | c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | } |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 390 | if (!sl) |
| 391 | c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 393 | mutex_unlock(&md->list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | return PAGE_SIZE - c; |
| 396 | } |
| 397 | |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 398 | static ssize_t w1_master_attribute_show_add(struct device *dev, |
| 399 | struct device_attribute *attr, char *buf) |
| 400 | { |
| 401 | int c = PAGE_SIZE; |
| 402 | c -= snprintf(buf+PAGE_SIZE - c, c, |
| 403 | "write device id xx-xxxxxxxxxxxx to add slave\n"); |
| 404 | return PAGE_SIZE - c; |
| 405 | } |
| 406 | |
| 407 | static int w1_atoreg_num(struct device *dev, const char *buf, size_t count, |
| 408 | struct w1_reg_num *rn) |
| 409 | { |
| 410 | unsigned int family; |
| 411 | unsigned long long id; |
| 412 | int i; |
| 413 | u64 rn64_le; |
| 414 | |
| 415 | /* The CRC value isn't read from the user because the sysfs directory |
| 416 | * doesn't include it and most messages from the bus search don't |
| 417 | * print it either. It would be unreasonable for the user to then |
| 418 | * provide it. |
| 419 | */ |
| 420 | const char *error_msg = "bad slave string format, expecting " |
| 421 | "ff-dddddddddddd\n"; |
| 422 | |
| 423 | if (buf[2] != '-') { |
| 424 | dev_err(dev, "%s", error_msg); |
| 425 | return -EINVAL; |
| 426 | } |
| 427 | i = sscanf(buf, "%02x-%012llx", &family, &id); |
| 428 | if (i != 2) { |
| 429 | dev_err(dev, "%s", error_msg); |
| 430 | return -EINVAL; |
| 431 | } |
| 432 | rn->family = family; |
| 433 | rn->id = id; |
| 434 | |
| 435 | rn64_le = cpu_to_le64(*(u64 *)rn); |
| 436 | rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7); |
| 437 | |
| 438 | #if 0 |
| 439 | dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n", |
| 440 | rn->family, (unsigned long long)rn->id, rn->crc); |
| 441 | #endif |
| 442 | |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | /* Searches the slaves in the w1_master and returns a pointer or NULL. |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 447 | * Note: must not hold list_mutex |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 448 | */ |
David Fries | 70b34d2 | 2014-01-15 22:29:17 -0600 | [diff] [blame] | 449 | struct w1_slave *w1_slave_search_device(struct w1_master *dev, |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 450 | struct w1_reg_num *rn) |
| 451 | { |
| 452 | struct w1_slave *sl; |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 453 | mutex_lock(&dev->list_mutex); |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 454 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
| 455 | if (sl->reg_num.family == rn->family && |
| 456 | sl->reg_num.id == rn->id && |
| 457 | sl->reg_num.crc == rn->crc) { |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 458 | mutex_unlock(&dev->list_mutex); |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 459 | return sl; |
| 460 | } |
| 461 | } |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 462 | mutex_unlock(&dev->list_mutex); |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 463 | return NULL; |
| 464 | } |
| 465 | |
| 466 | static ssize_t w1_master_attribute_store_add(struct device *dev, |
| 467 | struct device_attribute *attr, |
| 468 | const char *buf, size_t count) |
| 469 | { |
| 470 | struct w1_master *md = dev_to_w1_master(dev); |
| 471 | struct w1_reg_num rn; |
| 472 | struct w1_slave *sl; |
| 473 | ssize_t result = count; |
| 474 | |
| 475 | if (w1_atoreg_num(dev, buf, count, &rn)) |
| 476 | return -EINVAL; |
| 477 | |
| 478 | mutex_lock(&md->mutex); |
| 479 | sl = w1_slave_search_device(md, &rn); |
| 480 | /* It would be nice to do a targeted search one the one-wire bus |
| 481 | * for the new device to see if it is out there or not. But the |
| 482 | * current search doesn't support that. |
| 483 | */ |
| 484 | if (sl) { |
| 485 | dev_info(dev, "Device %s already exists\n", sl->name); |
| 486 | result = -EINVAL; |
| 487 | } else { |
| 488 | w1_attach_slave_device(md, &rn); |
| 489 | } |
| 490 | mutex_unlock(&md->mutex); |
| 491 | |
| 492 | return result; |
| 493 | } |
| 494 | |
| 495 | static ssize_t w1_master_attribute_show_remove(struct device *dev, |
| 496 | struct device_attribute *attr, char *buf) |
| 497 | { |
| 498 | int c = PAGE_SIZE; |
| 499 | c -= snprintf(buf+PAGE_SIZE - c, c, |
| 500 | "write device id xx-xxxxxxxxxxxx to remove slave\n"); |
| 501 | return PAGE_SIZE - c; |
| 502 | } |
| 503 | |
| 504 | static ssize_t w1_master_attribute_store_remove(struct device *dev, |
| 505 | struct device_attribute *attr, |
| 506 | const char *buf, size_t count) |
| 507 | { |
| 508 | struct w1_master *md = dev_to_w1_master(dev); |
| 509 | struct w1_reg_num rn; |
| 510 | struct w1_slave *sl; |
| 511 | ssize_t result = count; |
| 512 | |
| 513 | if (w1_atoreg_num(dev, buf, count, &rn)) |
| 514 | return -EINVAL; |
| 515 | |
| 516 | mutex_lock(&md->mutex); |
| 517 | sl = w1_slave_search_device(md, &rn); |
| 518 | if (sl) { |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 519 | result = w1_slave_detach(sl); |
| 520 | /* refcnt 0 means it was detached in the call */ |
| 521 | if (result == 0) |
| 522 | result = count; |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 523 | } else { |
| 524 | dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family, |
| 525 | (unsigned long long)rn.id); |
| 526 | result = -EINVAL; |
| 527 | } |
| 528 | mutex_unlock(&md->mutex); |
| 529 | |
| 530 | return result; |
| 531 | } |
| 532 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 533 | #define W1_MASTER_ATTR_RO(_name, _mode) \ |
| 534 | struct device_attribute w1_master_attribute_##_name = \ |
| 535 | __ATTR(w1_master_##_name, _mode, \ |
| 536 | w1_master_attribute_show_##_name, NULL) |
| 537 | |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 538 | #define W1_MASTER_ATTR_RW(_name, _mode) \ |
| 539 | struct device_attribute w1_master_attribute_##_name = \ |
| 540 | __ATTR(w1_master_##_name, _mode, \ |
| 541 | w1_master_attribute_show_##_name, \ |
| 542 | w1_master_attribute_store_##_name) |
| 543 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 544 | static W1_MASTER_ATTR_RO(name, S_IRUGO); |
| 545 | static W1_MASTER_ATTR_RO(slaves, S_IRUGO); |
| 546 | static W1_MASTER_ATTR_RO(slave_count, S_IRUGO); |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 547 | static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 548 | static W1_MASTER_ATTR_RO(attempts, S_IRUGO); |
| 549 | static W1_MASTER_ATTR_RO(timeout, S_IRUGO); |
Dmitry Khromov | c309835 | 2015-05-12 22:29:44 +0300 | [diff] [blame] | 550 | static W1_MASTER_ATTR_RO(timeout_us, S_IRUGO); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 551 | static W1_MASTER_ATTR_RO(pointer, S_IRUGO); |
Brian Swetland | 12aa4c6 | 2010-10-27 15:34:49 -0700 | [diff] [blame] | 552 | static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP); |
| 553 | static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP); |
| 554 | static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP); |
| 555 | static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 556 | |
| 557 | static struct attribute *w1_master_default_attrs[] = { |
| 558 | &w1_master_attribute_name.attr, |
| 559 | &w1_master_attribute_slaves.attr, |
| 560 | &w1_master_attribute_slave_count.attr, |
| 561 | &w1_master_attribute_max_slave_count.attr, |
| 562 | &w1_master_attribute_attempts.attr, |
| 563 | &w1_master_attribute_timeout.attr, |
Dmitry Khromov | c309835 | 2015-05-12 22:29:44 +0300 | [diff] [blame] | 564 | &w1_master_attribute_timeout_us.attr, |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 565 | &w1_master_attribute_pointer.attr, |
Evgeniy Polyakov | 2a9d0c1 | 2005-06-04 01:31:02 +0400 | [diff] [blame] | 566 | &w1_master_attribute_search.attr, |
David Fries | 6a158c0 | 2008-10-15 22:04:42 -0700 | [diff] [blame] | 567 | &w1_master_attribute_pullup.attr, |
David Fries | 9b46741 | 2008-10-15 22:04:43 -0700 | [diff] [blame] | 568 | &w1_master_attribute_add.attr, |
| 569 | &w1_master_attribute_remove.attr, |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 570 | NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | }; |
| 572 | |
Arvind Yadav | a890d56 | 2017-07-28 16:00:42 +0530 | [diff] [blame] | 573 | static const struct attribute_group w1_master_defattr_group = { |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 574 | .attrs = w1_master_default_attrs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | }; |
| 576 | |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 577 | int w1_create_master_attributes(struct w1_master *master) |
| 578 | { |
| 579 | return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group); |
| 580 | } |
| 581 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 582 | void w1_destroy_master_attributes(struct w1_master *master) |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 583 | { |
| 584 | sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group); |
| 585 | } |
| 586 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 587 | static int w1_uevent(struct device *dev, struct kobj_uevent_env *env) |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 588 | { |
| 589 | struct w1_master *md = NULL; |
| 590 | struct w1_slave *sl = NULL; |
| 591 | char *event_owner, *name; |
Devendra Naga | 526be41 | 2012-05-19 07:31:54 +0400 | [diff] [blame] | 592 | int err = 0; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 593 | |
| 594 | if (dev->driver == &w1_master_driver) { |
| 595 | md = container_of(dev, struct w1_master, dev); |
| 596 | event_owner = "master"; |
| 597 | name = md->name; |
| 598 | } else if (dev->driver == &w1_slave_driver) { |
| 599 | sl = container_of(dev, struct w1_slave, dev); |
| 600 | event_owner = "slave"; |
| 601 | name = sl->name; |
| 602 | } else { |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 603 | dev_dbg(dev, "Unknown event.\n"); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 604 | return -EINVAL; |
| 605 | } |
| 606 | |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 607 | dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n", |
Kay Sievers | 40f91de6 | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 608 | event_owner, name, dev_name(dev)); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 609 | |
| 610 | if (dev->driver != &w1_slave_driver || !sl) |
Devendra Naga | 526be41 | 2012-05-19 07:31:54 +0400 | [diff] [blame] | 611 | goto end; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 612 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 613 | err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family); |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 614 | if (err) |
Devendra Naga | 526be41 | 2012-05-19 07:31:54 +0400 | [diff] [blame] | 615 | goto end; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 616 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 617 | err = add_uevent_var(env, "W1_SLAVE_ID=%024LX", |
| 618 | (unsigned long long)sl->reg_num.id); |
Devendra Naga | 526be41 | 2012-05-19 07:31:54 +0400 | [diff] [blame] | 619 | end: |
| 620 | return err; |
| 621 | } |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 622 | |
David Fries | 18d7f89 | 2014-04-16 01:21:21 -0500 | [diff] [blame] | 623 | static int w1_family_notify(unsigned long action, struct w1_slave *sl) |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 624 | { |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 625 | struct w1_family_ops *fops; |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 626 | int err; |
| 627 | |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 628 | fops = sl->family->fops; |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 629 | |
Hans-Frieder Vogt | 2962aec | 2013-10-06 21:13:35 +0200 | [diff] [blame] | 630 | if (!fops) |
| 631 | return 0; |
| 632 | |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 633 | switch (action) { |
| 634 | case BUS_NOTIFY_ADD_DEVICE: |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 635 | /* if the family driver needs to initialize something... */ |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 636 | if (fops->add_slave) { |
| 637 | err = fops->add_slave(sl); |
| 638 | if (err < 0) { |
| 639 | dev_err(&sl->dev, |
| 640 | "add_slave() call failed. err=%d\n", |
| 641 | err); |
| 642 | return err; |
| 643 | } |
| 644 | } |
| 645 | if (fops->groups) { |
| 646 | err = sysfs_create_groups(&sl->dev.kobj, fops->groups); |
| 647 | if (err) { |
| 648 | dev_err(&sl->dev, |
| 649 | "sysfs group creation failed. err=%d\n", |
| 650 | err); |
| 651 | return err; |
| 652 | } |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 653 | } |
Jaghathiswari Rankappagounder Natarajan | 2eb7954 | 2017-08-30 16:34:33 -0700 | [diff] [blame] | 654 | if (IS_REACHABLE(CONFIG_HWMON) && fops->chip_info) { |
| 655 | struct device *hwmon |
| 656 | = hwmon_device_register_with_info(&sl->dev, |
| 657 | "w1_slave_temp", sl, |
| 658 | fops->chip_info, |
| 659 | NULL); |
| 660 | if (IS_ERR(hwmon)) { |
| 661 | dev_warn(&sl->dev, |
| 662 | "could not create hwmon device\n"); |
| 663 | } else { |
| 664 | sl->hwmon = hwmon; |
| 665 | } |
| 666 | } |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 667 | break; |
| 668 | case BUS_NOTIFY_DEL_DEVICE: |
Jaghathiswari Rankappagounder Natarajan | 2eb7954 | 2017-08-30 16:34:33 -0700 | [diff] [blame] | 669 | if (IS_REACHABLE(CONFIG_HWMON) && fops->chip_info && |
| 670 | sl->hwmon) |
| 671 | hwmon_device_unregister(sl->hwmon); |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 672 | if (fops->remove_slave) |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 673 | sl->family->fops->remove_slave(sl); |
Greg Kroah-Hartman | 36c27a6 | 2013-08-21 15:44:55 -0700 | [diff] [blame] | 674 | if (fops->groups) |
| 675 | sysfs_remove_groups(&sl->dev.kobj, fops->groups); |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 676 | break; |
| 677 | } |
| 678 | return 0; |
| 679 | } |
| 680 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | static int __w1_attach_slave_device(struct w1_slave *sl) |
| 682 | { |
| 683 | int err; |
| 684 | |
| 685 | sl->dev.parent = &sl->master->dev; |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 686 | sl->dev.driver = &w1_slave_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | sl->dev.bus = &w1_bus_type; |
| 688 | sl->dev.release = &w1_slave_release; |
Greg Kroah-Hartman | 5b187b3 | 2013-08-21 13:24:33 -0700 | [diff] [blame] | 689 | sl->dev.groups = w1_slave_groups; |
Daniel Mack | fae6803 | 2018-07-06 07:35:50 +0200 | [diff] [blame] | 690 | sl->dev.of_node = of_find_matching_node(sl->master->dev.of_node, |
| 691 | sl->family->of_match_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
Kay Sievers | 40f91de6 | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 693 | dev_set_name(&sl->dev, "%02x-%012llx", |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 694 | (unsigned int) sl->reg_num.family, |
| 695 | (unsigned long long) sl->reg_num.id); |
| 696 | snprintf(&sl->name[0], sizeof(sl->name), |
| 697 | "%02x-%012llx", |
| 698 | (unsigned int) sl->reg_num.family, |
| 699 | (unsigned long long) sl->reg_num.id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
Andrew Morton | c6976a4 | 2006-05-14 21:43:50 -0700 | [diff] [blame] | 701 | dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__, |
Kay Sievers | 40f91de6 | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 702 | dev_name(&sl->dev), sl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
David Fries | 18d7f89 | 2014-04-16 01:21:21 -0500 | [diff] [blame] | 704 | /* suppress for w1_family_notify before sending KOBJ_ADD */ |
| 705 | dev_set_uevent_suppress(&sl->dev, true); |
| 706 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | err = device_register(&sl->dev); |
| 708 | if (err < 0) { |
| 709 | dev_err(&sl->dev, |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 710 | "Device registration [%s] failed. err=%d\n", |
Kay Sievers | 40f91de6 | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 711 | dev_name(&sl->dev), err); |
Arvind Yadav | 0ec4eb7 | 2018-03-06 15:54:06 +0530 | [diff] [blame] | 712 | put_device(&sl->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | return err; |
| 714 | } |
David Fries | 18d7f89 | 2014-04-16 01:21:21 -0500 | [diff] [blame] | 715 | w1_family_notify(BUS_NOTIFY_ADD_DEVICE, sl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | |
Greg Kroah-Hartman | 47eba33 | 2013-08-21 13:24:32 -0700 | [diff] [blame] | 717 | dev_set_uevent_suppress(&sl->dev, false); |
| 718 | kobject_uevent(&sl->dev.kobj, KOBJ_ADD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 720 | mutex_lock(&sl->master->list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | list_add_tail(&sl->w1_slave_entry, &sl->master->slist); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 722 | mutex_unlock(&sl->master->list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | return 0; |
| 725 | } |
| 726 | |
David Fries | 70b34d2 | 2014-01-15 22:29:17 -0600 | [diff] [blame] | 727 | int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | { |
| 729 | struct w1_slave *sl; |
| 730 | struct w1_family *f; |
| 731 | int err; |
| 732 | struct w1_netlink_msg msg; |
| 733 | |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 734 | sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | if (!sl) { |
| 736 | dev_err(&dev->dev, |
| 737 | "%s: failed to allocate new slave device.\n", |
| 738 | __func__); |
| 739 | return -ENOMEM; |
| 740 | } |
| 741 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
| 743 | sl->owner = THIS_MODULE; |
| 744 | sl->master = dev; |
Michal Nazarewicz | bb67093 | 2013-11-12 15:11:42 -0800 | [diff] [blame] | 745 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 747 | memset(&msg, 0, sizeof(msg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | memcpy(&sl->reg_num, rn, sizeof(sl->reg_num)); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 749 | atomic_set(&sl->refcnt, 1); |
| 750 | atomic_inc(&sl->master->refcnt); |
Alex A. Mihaylov | 2c927c0 | 2017-06-13 18:57:56 +0300 | [diff] [blame] | 751 | dev->slave_count++; |
Andrew Worsley | f688753 | 2017-08-27 21:34:23 +1000 | [diff] [blame] | 752 | dev_info(&dev->dev, "Attaching one wire slave %02x.%012llx crc %02x\n", |
| 753 | rn->family, (unsigned long long)rn->id, rn->crc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
Hans-Frieder Vogt | bc04d76 | 2013-10-06 21:13:40 +0200 | [diff] [blame] | 755 | /* slave modules need to be loaded in a context with unlocked mutex */ |
| 756 | mutex_unlock(&dev->mutex); |
Ingo Flaschberger | 065c095 | 2018-05-01 16:10:33 +0200 | [diff] [blame] | 757 | request_module("w1-family-0x%02X", rn->family); |
Hans-Frieder Vogt | bc04d76 | 2013-10-06 21:13:40 +0200 | [diff] [blame] | 758 | mutex_lock(&dev->mutex); |
Alexander Stein | 8d7bda5 | 2013-05-26 20:06:50 +0200 | [diff] [blame] | 759 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | spin_lock(&w1_flock); |
| 761 | f = w1_family_registered(rn->family); |
| 762 | if (!f) { |
Evgeniy Polyakov | 99c5bfe | 2005-06-04 01:31:26 +0400 | [diff] [blame] | 763 | f= &w1_default_family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n", |
| 765 | rn->family, rn->family, |
| 766 | (unsigned long long)rn->id, rn->crc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | } |
| 768 | __w1_family_get(f); |
| 769 | spin_unlock(&w1_flock); |
| 770 | |
| 771 | sl->family = f; |
| 772 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | err = __w1_attach_slave_device(sl); |
| 774 | if (err < 0) { |
| 775 | dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__, |
| 776 | sl->name); |
Alex A. Mihaylov | 2c927c0 | 2017-06-13 18:57:56 +0300 | [diff] [blame] | 777 | dev->slave_count--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | w1_family_put(sl->family); |
Maciej S. Szmigiero | d2ce4ea | 2017-01-21 23:50:18 +0100 | [diff] [blame] | 779 | atomic_dec(&sl->master->refcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | kfree(sl); |
| 781 | return err; |
| 782 | } |
| 783 | |
| 784 | sl->ttl = dev->slave_ttl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 786 | memcpy(msg.id.id, rn, sizeof(msg.id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | msg.type = W1_SLAVE_ADD; |
| 788 | w1_netlink_send(dev, &msg); |
| 789 | |
| 790 | return 0; |
| 791 | } |
| 792 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 793 | int w1_unref_slave(struct w1_slave *sl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | { |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 795 | struct w1_master *dev = sl->master; |
| 796 | int refcnt; |
| 797 | mutex_lock(&dev->list_mutex); |
| 798 | refcnt = atomic_sub_return(1, &sl->refcnt); |
| 799 | if (refcnt == 0) { |
| 800 | struct w1_netlink_msg msg; |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 801 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 802 | dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, |
| 803 | sl->name, sl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 805 | list_del(&sl->w1_slave_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 807 | memset(&msg, 0, sizeof(msg)); |
| 808 | memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id)); |
| 809 | msg.type = W1_SLAVE_REMOVE; |
| 810 | w1_netlink_send(sl->master, &msg); |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 811 | |
David Fries | 18d7f89 | 2014-04-16 01:21:21 -0500 | [diff] [blame] | 812 | w1_family_notify(BUS_NOTIFY_DEL_DEVICE, sl); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 813 | device_unregister(&sl->dev); |
| 814 | #ifdef DEBUG |
| 815 | memset(sl, 0, sizeof(*sl)); |
| 816 | #endif |
| 817 | kfree(sl); |
| 818 | } |
| 819 | atomic_dec(&dev->refcnt); |
| 820 | mutex_unlock(&dev->list_mutex); |
| 821 | return refcnt; |
| 822 | } |
Evgeniy Polyakov | 3aca692 | 2005-08-11 17:27:50 +0400 | [diff] [blame] | 823 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 824 | int w1_slave_detach(struct w1_slave *sl) |
| 825 | { |
| 826 | /* Only detach a slave once as it decreases the refcnt each time. */ |
| 827 | int destroy_now; |
| 828 | mutex_lock(&sl->master->list_mutex); |
| 829 | destroy_now = !test_bit(W1_SLAVE_DETACH, &sl->flags); |
| 830 | set_bit(W1_SLAVE_DETACH, &sl->flags); |
| 831 | mutex_unlock(&sl->master->list_mutex); |
| 832 | |
| 833 | if (destroy_now) |
| 834 | destroy_now = !w1_unref_slave(sl); |
| 835 | return destroy_now ? 0 : -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | } |
| 837 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 838 | struct w1_master *w1_search_master_id(u32 id) |
| 839 | { |
| 840 | struct w1_master *dev; |
| 841 | int found = 0; |
| 842 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 843 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 844 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
| 845 | if (dev->id == id) { |
| 846 | found = 1; |
| 847 | atomic_inc(&dev->refcnt); |
| 848 | break; |
| 849 | } |
| 850 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 851 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 852 | |
| 853 | return (found)?dev:NULL; |
| 854 | } |
| 855 | |
| 856 | struct w1_slave *w1_search_slave(struct w1_reg_num *id) |
| 857 | { |
| 858 | struct w1_master *dev; |
| 859 | struct w1_slave *sl = NULL; |
| 860 | int found = 0; |
| 861 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 862 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 863 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 864 | mutex_lock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 865 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) { |
| 866 | if (sl->reg_num.family == id->family && |
| 867 | sl->reg_num.id == id->id && |
| 868 | sl->reg_num.crc == id->crc) { |
| 869 | found = 1; |
| 870 | atomic_inc(&dev->refcnt); |
| 871 | atomic_inc(&sl->refcnt); |
| 872 | break; |
| 873 | } |
| 874 | } |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 875 | mutex_unlock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 876 | |
| 877 | if (found) |
| 878 | break; |
| 879 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 880 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 881 | |
| 882 | return (found)?sl:NULL; |
| 883 | } |
| 884 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 885 | void w1_reconnect_slaves(struct w1_family *f, int attach) |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 886 | { |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 887 | struct w1_slave *sl, *sln; |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 888 | struct w1_master *dev; |
| 889 | |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 890 | mutex_lock(&w1_mlock); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 891 | list_for_each_entry(dev, &w1_masters, w1_master_entry) { |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 892 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
| 893 | "for family %02x.\n", dev->name, f->fid); |
| 894 | mutex_lock(&dev->mutex); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 895 | mutex_lock(&dev->list_mutex); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 896 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
| 897 | /* If it is a new family, slaves with the default |
| 898 | * family driver and are that family will be |
| 899 | * connected. If the family is going away, devices |
| 900 | * matching that family are reconneced. |
| 901 | */ |
| 902 | if ((attach && sl->family->fid == W1_FAMILY_DEFAULT |
| 903 | && sl->reg_num.family == f->fid) || |
| 904 | (!attach && sl->family->fid == f->fid)) { |
| 905 | struct w1_reg_num rn; |
| 906 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 907 | mutex_unlock(&dev->list_mutex); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 908 | memcpy(&rn, &sl->reg_num, sizeof(rn)); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 909 | /* If it was already in use let the automatic |
| 910 | * scan pick it up again later. |
| 911 | */ |
| 912 | if (!w1_slave_detach(sl)) |
| 913 | w1_attach_slave_device(dev, &rn); |
| 914 | mutex_lock(&dev->list_mutex); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 915 | } |
| 916 | } |
| 917 | dev_dbg(&dev->dev, "Reconnecting slaves in device %s " |
| 918 | "has been finished.\n", dev->name); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 919 | mutex_unlock(&dev->list_mutex); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 920 | mutex_unlock(&dev->mutex); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 921 | } |
Evgeniy Polyakov | abd52a1 | 2006-04-03 12:04:27 +0400 | [diff] [blame] | 922 | mutex_unlock(&w1_mlock); |
Evgeniy Polyakov | 6adf87b | 2005-06-04 01:29:25 +0400 | [diff] [blame] | 923 | } |
| 924 | |
David Fries | 963bb10 | 2011-05-26 16:26:03 -0700 | [diff] [blame] | 925 | void w1_slave_found(struct w1_master *dev, u64 rn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | struct w1_slave *sl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | struct w1_reg_num *tmp; |
Evgeniy Polyakov | 0e65f82 | 2005-06-30 22:52:38 +0400 | [diff] [blame] | 929 | u64 rn_le = cpu_to_le64(rn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 931 | atomic_inc(&dev->refcnt); |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 932 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | tmp = (struct w1_reg_num *) &rn; |
| 934 | |
David Fries | cd7b28d | 2008-10-15 22:04:44 -0700 | [diff] [blame] | 935 | sl = w1_slave_search_device(dev, tmp); |
| 936 | if (sl) { |
Michal Nazarewicz | bb67093 | 2013-11-12 15:11:42 -0800 | [diff] [blame] | 937 | set_bit(W1_SLAVE_ACTIVE, &sl->flags); |
David Fries | cd7b28d | 2008-10-15 22:04:44 -0700 | [diff] [blame] | 938 | } else { |
| 939 | if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7)) |
| 940 | w1_attach_slave_device(dev, tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | } |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 942 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | atomic_dec(&dev->refcnt); |
| 944 | } |
| 945 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 946 | /** |
David Fries | b3be177 | 2014-01-15 22:29:25 -0600 | [diff] [blame] | 947 | * w1_search() - Performs a ROM Search & registers any devices found. |
| 948 | * @dev: The master device to search |
| 949 | * @search_type: W1_SEARCH to search all devices, or W1_ALARM_SEARCH |
| 950 | * to return only devices in the alarmed state |
| 951 | * @cb: Function to call when a device is found |
| 952 | * |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 953 | * The 1-wire search is a simple binary tree search. |
| 954 | * For each bit of the address, we read two bits and write one bit. |
| 955 | * The bit written will put to sleep all devies that don't match that bit. |
| 956 | * When the two reads differ, the direction choice is obvious. |
| 957 | * When both bits are 0, we must choose a path to take. |
| 958 | * When we can scan all 64 bits without having to choose a path, we are done. |
| 959 | * |
| 960 | * See "Application note 187 1-wire search algorithm" at www.maxim-ic.com |
| 961 | * |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 962 | */ |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 963 | void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | { |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 965 | u64 last_rn, rn, tmp64; |
| 966 | int i, slave_count = 0; |
| 967 | int last_zero, last_device; |
| 968 | int search_bit, desc_bit; |
| 969 | u8 triplet_ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 971 | search_bit = 0; |
David Fries | 3c6955e | 2014-01-15 22:29:16 -0600 | [diff] [blame] | 972 | rn = dev->search_id; |
| 973 | last_rn = 0; |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 974 | last_device = 0; |
| 975 | last_zero = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | |
| 977 | desc_bit = 64; |
| 978 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 979 | while ( !last_device && (slave_count++ < dev->max_slave_count) ) { |
| 980 | last_rn = rn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | rn = 0; |
| 982 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | /* |
| 984 | * Reset bus and all 1-wire device state machines |
| 985 | * so they can respond to our requests. |
| 986 | * |
| 987 | * Return 0 - device(s) present, 1 - no devices present. |
| 988 | */ |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 989 | mutex_lock(&dev->bus_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | if (w1_reset_bus(dev)) { |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 991 | mutex_unlock(&dev->bus_mutex); |
Evgeniy Polyakov | 2da5bf8 | 2005-08-12 11:46:22 -0700 | [diff] [blame] | 992 | dev_dbg(&dev->dev, "No devices present on the wire.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | break; |
| 994 | } |
| 995 | |
Evgeniy Polyakov | c9cbf55 | 2011-12-10 04:36:11 +0300 | [diff] [blame] | 996 | /* Do fast search on single slave bus */ |
| 997 | if (dev->max_slave_count == 1) { |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 998 | int rv; |
Evgeniy Polyakov | c9cbf55 | 2011-12-10 04:36:11 +0300 | [diff] [blame] | 999 | w1_write_8(dev, W1_READ_ROM); |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 1000 | rv = w1_read_block(dev, (u8 *)&rn, 8); |
| 1001 | mutex_unlock(&dev->bus_mutex); |
Evgeniy Polyakov | c9cbf55 | 2011-12-10 04:36:11 +0300 | [diff] [blame] | 1002 | |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 1003 | if (rv == 8 && rn) |
Evgeniy Polyakov | c9cbf55 | 2011-12-10 04:36:11 +0300 | [diff] [blame] | 1004 | cb(dev, rn); |
| 1005 | |
| 1006 | break; |
| 1007 | } |
| 1008 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1009 | /* Start the search */ |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1010 | w1_write_8(dev, search_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | for (i = 0; i < 64; ++i) { |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1012 | /* Determine the direction/search bit */ |
| 1013 | if (i == desc_bit) |
| 1014 | search_bit = 1; /* took the 0 path last time, so take the 1 path */ |
| 1015 | else if (i > desc_bit) |
| 1016 | search_bit = 0; /* take the 0 path on the next branch */ |
| 1017 | else |
| 1018 | search_bit = ((last_rn >> i) & 0x1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
David Fries | b3be177 | 2014-01-15 22:29:25 -0600 | [diff] [blame] | 1020 | /* Read two bits and write one bit */ |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1021 | triplet_ret = w1_triplet(dev, search_bit); |
| 1022 | |
| 1023 | /* quit if no device responded */ |
| 1024 | if ( (triplet_ret & 0x03) == 0x03 ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | break; |
| 1026 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1027 | /* If both directions were valid, and we took the 0 path... */ |
| 1028 | if (triplet_ret == 0) |
| 1029 | last_zero = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1031 | /* extract the direction taken & update the device number */ |
| 1032 | tmp64 = (triplet_ret >> 2); |
| 1033 | rn |= (tmp64 << i); |
David Fries | 0d671b2 | 2008-10-15 22:04:39 -0700 | [diff] [blame] | 1034 | |
David Fries | 4210569 | 2014-01-15 22:29:13 -0600 | [diff] [blame] | 1035 | if (test_bit(W1_ABORT_SEARCH, &dev->flags)) { |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 1036 | mutex_unlock(&dev->bus_mutex); |
David Fries | 7dc8f52 | 2008-10-15 22:04:58 -0700 | [diff] [blame] | 1037 | dev_dbg(&dev->dev, "Abort w1_search\n"); |
David Fries | 0d671b2 | 2008-10-15 22:04:39 -0700 | [diff] [blame] | 1038 | return; |
| 1039 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | } |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 1041 | mutex_unlock(&dev->bus_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1043 | if ( (triplet_ret & 0x03) != 0x03 ) { |
David Fries | 3c6955e | 2014-01-15 22:29:16 -0600 | [diff] [blame] | 1044 | if ((desc_bit == last_zero) || (last_zero < 0)) { |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1045 | last_device = 1; |
David Fries | 3c6955e | 2014-01-15 22:29:16 -0600 | [diff] [blame] | 1046 | dev->search_id = 0; |
| 1047 | } else { |
| 1048 | dev->search_id = rn; |
| 1049 | } |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1050 | desc_bit = last_zero; |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1051 | cb(dev, rn); |
Evgeniy Polyakov | 6b72986 | 2005-06-04 01:30:43 +0400 | [diff] [blame] | 1052 | } |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 1053 | |
| 1054 | if (!last_device && slave_count == dev->max_slave_count && |
| 1055 | !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) { |
David Fries | 3c6955e | 2014-01-15 22:29:16 -0600 | [diff] [blame] | 1056 | /* Only max_slave_count will be scanned in a search, |
| 1057 | * but it will start where it left off next search |
| 1058 | * until all ids are identified and then it will start |
| 1059 | * over. A continued search will report the previous |
| 1060 | * last id as the first id (provided it is still on the |
| 1061 | * bus). |
| 1062 | */ |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 1063 | dev_info(&dev->dev, "%s: max_slave_count %d reached, " |
David Fries | 3c6955e | 2014-01-15 22:29:16 -0600 | [diff] [blame] | 1064 | "will continue next search.\n", __func__, |
David Fries | a161305 | 2014-01-15 22:29:15 -0600 | [diff] [blame] | 1065 | dev->max_slave_count); |
| 1066 | set_bit(W1_WARN_MAX_COUNT, &dev->flags); |
| 1067 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | } |
| 1069 | } |
| 1070 | |
David Fries | 963bb10 | 2011-05-26 16:26:03 -0700 | [diff] [blame] | 1071 | void w1_search_process_cb(struct w1_master *dev, u8 search_type, |
| 1072 | w1_slave_found_callback cb) |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1073 | { |
| 1074 | struct w1_slave *sl, *sln; |
| 1075 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1076 | mutex_lock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1077 | list_for_each_entry(sl, &dev->slist, w1_slave_entry) |
Michal Nazarewicz | bb67093 | 2013-11-12 15:11:42 -0800 | [diff] [blame] | 1078 | clear_bit(W1_SLAVE_ACTIVE, &sl->flags); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1079 | mutex_unlock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1080 | |
David Fries | 963bb10 | 2011-05-26 16:26:03 -0700 | [diff] [blame] | 1081 | w1_search_devices(dev, search_type, cb); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1082 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1083 | mutex_lock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1084 | list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) { |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1085 | if (!test_bit(W1_SLAVE_ACTIVE, &sl->flags) && !--sl->ttl) { |
| 1086 | mutex_unlock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1087 | w1_slave_detach(sl); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1088 | mutex_lock(&dev->list_mutex); |
| 1089 | } |
Michal Nazarewicz | bb67093 | 2013-11-12 15:11:42 -0800 | [diff] [blame] | 1090 | else if (test_bit(W1_SLAVE_ACTIVE, &sl->flags)) |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1091 | sl->ttl = dev->slave_ttl; |
| 1092 | } |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1093 | mutex_unlock(&dev->list_mutex); |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1094 | |
| 1095 | if (dev->search_count > 0) |
| 1096 | dev->search_count--; |
| 1097 | } |
| 1098 | |
David Fries | 963bb10 | 2011-05-26 16:26:03 -0700 | [diff] [blame] | 1099 | static void w1_search_process(struct w1_master *dev, u8 search_type) |
| 1100 | { |
| 1101 | w1_search_process_cb(dev, search_type, w1_slave_found); |
| 1102 | } |
| 1103 | |
David Fries | b3be177 | 2014-01-15 22:29:25 -0600 | [diff] [blame] | 1104 | /** |
| 1105 | * w1_process_callbacks() - execute each dev->async_list callback entry |
| 1106 | * @dev: w1_master device |
| 1107 | * |
Alexey Khoroshilov | a0f1046 | 2014-05-07 01:26:04 +0400 | [diff] [blame] | 1108 | * The w1 master list_mutex must be held. |
| 1109 | * |
David Fries | b3be177 | 2014-01-15 22:29:25 -0600 | [diff] [blame] | 1110 | * Return: 1 if there were commands to executed 0 otherwise |
| 1111 | */ |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1112 | int w1_process_callbacks(struct w1_master *dev) |
| 1113 | { |
| 1114 | int ret = 0; |
| 1115 | struct w1_async_cmd *async_cmd, *async_n; |
| 1116 | |
| 1117 | /* The list can be added to in another thread, loop until it is empty */ |
| 1118 | while (!list_empty(&dev->async_list)) { |
| 1119 | list_for_each_entry_safe(async_cmd, async_n, &dev->async_list, |
| 1120 | async_entry) { |
| 1121 | /* drop the lock, if it is a search it can take a long |
| 1122 | * time */ |
| 1123 | mutex_unlock(&dev->list_mutex); |
| 1124 | async_cmd->cb(dev, async_cmd); |
| 1125 | ret = 1; |
| 1126 | mutex_lock(&dev->list_mutex); |
| 1127 | } |
| 1128 | } |
| 1129 | return ret; |
| 1130 | } |
| 1131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | int w1_process(void *data) |
| 1133 | { |
| 1134 | struct w1_master *dev = (struct w1_master *) data; |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 1135 | /* As long as w1_timeout is only set by a module parameter the sleep |
| 1136 | * time can be calculated in jiffies once. |
| 1137 | */ |
Dmitry Khromov | c309835 | 2015-05-12 22:29:44 +0300 | [diff] [blame] | 1138 | const unsigned long jtime = |
| 1139 | usecs_to_jiffies(w1_timeout * 1000000 + w1_timeout_us); |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1140 | /* remainder if it woke up early */ |
| 1141 | unsigned long jremain = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1143 | for (;;) { |
| 1144 | |
| 1145 | if (!jremain && dev->search_count) { |
David Fries | 01e14d6 | 2008-10-15 22:04:40 -0700 | [diff] [blame] | 1146 | mutex_lock(&dev->mutex); |
| 1147 | w1_search_process(dev, W1_SEARCH); |
| 1148 | mutex_unlock(&dev->mutex); |
| 1149 | } |
| 1150 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1151 | mutex_lock(&dev->list_mutex); |
| 1152 | /* Note, w1_process_callback drops the lock while processing, |
| 1153 | * but locks it again before returning. |
| 1154 | */ |
| 1155 | if (!w1_process_callbacks(dev) && jremain) { |
| 1156 | /* a wake up is either to stop the thread, process |
| 1157 | * callbacks, or search, it isn't process callbacks, so |
| 1158 | * schedule a search. |
| 1159 | */ |
| 1160 | jremain = 1; |
| 1161 | } |
| 1162 | |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 1163 | __set_current_state(TASK_INTERRUPTIBLE); |
| 1164 | |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1165 | /* hold list_mutex until after interruptible to prevent loosing |
| 1166 | * the wakeup signal when async_cmd is added. |
| 1167 | */ |
| 1168 | mutex_unlock(&dev->list_mutex); |
| 1169 | |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 1170 | if (kthread_should_stop()) |
| 1171 | break; |
| 1172 | |
| 1173 | /* Only sleep when the search is active. */ |
David Fries | 9fcbbac | 2014-01-15 22:29:18 -0600 | [diff] [blame] | 1174 | if (dev->search_count) { |
| 1175 | if (!jremain) |
| 1176 | jremain = jtime; |
| 1177 | jremain = schedule_timeout(jremain); |
| 1178 | } |
David Fries | 3c52e4e | 2008-10-15 22:04:41 -0700 | [diff] [blame] | 1179 | else |
| 1180 | schedule(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | } |
| 1182 | |
| 1183 | atomic_dec(&dev->refcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | |
| 1185 | return 0; |
| 1186 | } |
| 1187 | |
Peter Huewe | 73a98fc | 2009-12-22 09:38:02 +0100 | [diff] [blame] | 1188 | static int __init w1_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | { |
| 1190 | int retval; |
| 1191 | |
Fjodor Schelichow | fdc9167 | 2014-06-19 02:52:00 +0200 | [diff] [blame] | 1192 | pr_info("Driver for 1-wire Dallas network protocol.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1194 | w1_init_netlink(); |
| 1195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | retval = bus_register(&w1_bus_type); |
| 1197 | if (retval) { |
Fjodor Schelichow | fdc9167 | 2014-06-19 02:52:00 +0200 | [diff] [blame] | 1198 | pr_err("Failed to register bus. err=%d.\n", retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | goto err_out_exit_init; |
| 1200 | } |
| 1201 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1202 | retval = driver_register(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | if (retval) { |
Fjodor Schelichow | fdc9167 | 2014-06-19 02:52:00 +0200 | [diff] [blame] | 1204 | pr_err("Failed to register master driver. err=%d.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | retval); |
| 1206 | goto err_out_bus_unregister; |
| 1207 | } |
| 1208 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1209 | retval = driver_register(&w1_slave_driver); |
| 1210 | if (retval) { |
Fjodor Schelichow | fdc9167 | 2014-06-19 02:52:00 +0200 | [diff] [blame] | 1211 | pr_err("Failed to register slave driver. err=%d.\n", |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1212 | retval); |
| 1213 | goto err_out_master_unregister; |
| 1214 | } |
| 1215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | return 0; |
| 1217 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1218 | #if 0 |
| 1219 | /* For undoing the slave register if there was a step after it. */ |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1220 | err_out_slave_unregister: |
| 1221 | driver_unregister(&w1_slave_driver); |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1222 | #endif |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1223 | |
| 1224 | err_out_master_unregister: |
| 1225 | driver_unregister(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | |
| 1227 | err_out_bus_unregister: |
| 1228 | bus_unregister(&w1_bus_type); |
| 1229 | |
| 1230 | err_out_exit_init: |
| 1231 | return retval; |
| 1232 | } |
| 1233 | |
Peter Huewe | 73a98fc | 2009-12-22 09:38:02 +0100 | [diff] [blame] | 1234 | static void __exit w1_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | { |
| 1236 | struct w1_master *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | |
David Fries | c30c9b1 | 2008-10-15 22:04:38 -0700 | [diff] [blame] | 1238 | /* Set netlink removal messages and some cleanup */ |
Evgeniy Polyakov | 7785925 | 2005-05-20 22:33:25 +0400 | [diff] [blame] | 1239 | list_for_each_entry(dev, &w1_masters, w1_master_entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | __w1_remove_master_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | |
Evgeniy Polyakov | 1200337 | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 1242 | w1_fini_netlink(); |
| 1243 | |
Evgeniy Polyakov | 7f772ed | 2005-08-11 13:20:07 +0400 | [diff] [blame] | 1244 | driver_unregister(&w1_slave_driver); |
| 1245 | driver_unregister(&w1_master_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | bus_unregister(&w1_bus_type); |
| 1247 | } |
| 1248 | |
| 1249 | module_init(w1_init); |
| 1250 | module_exit(w1_fini); |
Andrew F. Davis | 50fa295 | 2017-05-16 15:02:12 -0500 | [diff] [blame] | 1251 | |
| 1252 | MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); |
| 1253 | MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); |
| 1254 | MODULE_LICENSE("GPL"); |