Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * bus driver for ccwgroup |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Sebastian Ott | f2962da | 2012-05-15 17:49:12 +0200 | [diff] [blame] | 4 | * Copyright IBM Corp. 2002, 2012 |
Sebastian Ott | 7e597a2 | 2009-06-16 10:30:21 +0200 | [diff] [blame] | 5 | * |
| 6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
| 7 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/list.h> |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/ctype.h> |
| 16 | #include <linux/dcache.h> |
| 17 | |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 18 | #include <asm/cio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <asm/ccwdev.h> |
| 20 | #include <asm/ccwgroup.h> |
| 21 | |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 22 | #include "device.h" |
| 23 | |
| 24 | #define CCW_BUS_ID_SIZE 10 |
Kay Sievers | 98df67b | 2008-12-25 13:38:55 +0100 | [diff] [blame] | 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | /* In Linux 2.4, we had a channel device layer called "chandev" |
| 27 | * that did all sorts of obscure stuff for networking devices. |
| 28 | * This is another driver that serves as a replacement for just |
| 29 | * one of its functions, namely the translation of single subchannels |
| 30 | * to devices that use multiple subchannels. |
| 31 | */ |
| 32 | |
Russell King | f9ccf45 | 2006-01-05 14:42:09 +0000 | [diff] [blame] | 33 | static struct bus_type ccwgroup_bus_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 35 | static void __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | { |
| 37 | int i; |
| 38 | char str[8]; |
| 39 | |
| 40 | for (i = 0; i < gdev->count; i++) { |
| 41 | sprintf(str, "cdev%d", i); |
| 42 | sysfs_remove_link(&gdev->dev.kobj, str); |
| 43 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device"); |
| 44 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | } |
| 46 | |
| 47 | /* |
Peter Oberparleiter | c030175 | 2011-01-05 12:48:13 +0100 | [diff] [blame] | 48 | * Remove references from ccw devices to ccw group device and from |
| 49 | * ccw group device to ccw devices. |
| 50 | */ |
| 51 | static void __ccwgroup_remove_cdev_refs(struct ccwgroup_device *gdev) |
| 52 | { |
| 53 | struct ccw_device *cdev; |
| 54 | int i; |
| 55 | |
| 56 | for (i = 0; i < gdev->count; i++) { |
| 57 | cdev = gdev->cdev[i]; |
| 58 | if (!cdev) |
| 59 | continue; |
| 60 | spin_lock_irq(cdev->ccwlock); |
| 61 | dev_set_drvdata(&cdev->dev, NULL); |
| 62 | spin_unlock_irq(cdev->ccwlock); |
| 63 | gdev->cdev[i] = NULL; |
| 64 | put_device(&cdev->dev); |
| 65 | } |
| 66 | } |
| 67 | |
Sebastian Ott | 683c3dc | 2012-11-22 15:56:39 +0100 | [diff] [blame] | 68 | /** |
| 69 | * ccwgroup_set_online() - enable a ccwgroup device |
| 70 | * @gdev: target ccwgroup device |
| 71 | * |
| 72 | * This function attempts to put the ccwgroup device into the online state. |
| 73 | * Returns: |
| 74 | * %0 on success and a negative error value on failure. |
| 75 | */ |
| 76 | int ccwgroup_set_online(struct ccwgroup_device *gdev) |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 77 | { |
| 78 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); |
Sebastian Ott | cff9710 | 2012-11-09 14:33:06 +0100 | [diff] [blame] | 79 | int ret = -EINVAL; |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 80 | |
| 81 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
| 82 | return -EAGAIN; |
| 83 | if (gdev->state == CCWGROUP_ONLINE) |
| 84 | goto out; |
| 85 | if (gdrv->set_online) |
| 86 | ret = gdrv->set_online(gdev); |
| 87 | if (ret) |
| 88 | goto out; |
| 89 | |
| 90 | gdev->state = CCWGROUP_ONLINE; |
| 91 | out: |
| 92 | atomic_set(&gdev->onoff, 0); |
| 93 | return ret; |
| 94 | } |
Sebastian Ott | 683c3dc | 2012-11-22 15:56:39 +0100 | [diff] [blame] | 95 | EXPORT_SYMBOL(ccwgroup_set_online); |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 96 | |
Sebastian Ott | 683c3dc | 2012-11-22 15:56:39 +0100 | [diff] [blame] | 97 | /** |
| 98 | * ccwgroup_set_offline() - disable a ccwgroup device |
| 99 | * @gdev: target ccwgroup device |
| 100 | * |
| 101 | * This function attempts to put the ccwgroup device into the offline state. |
| 102 | * Returns: |
| 103 | * %0 on success and a negative error value on failure. |
| 104 | */ |
| 105 | int ccwgroup_set_offline(struct ccwgroup_device *gdev) |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 106 | { |
| 107 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); |
Sebastian Ott | cff9710 | 2012-11-09 14:33:06 +0100 | [diff] [blame] | 108 | int ret = -EINVAL; |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 109 | |
| 110 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
| 111 | return -EAGAIN; |
| 112 | if (gdev->state == CCWGROUP_OFFLINE) |
| 113 | goto out; |
| 114 | if (gdrv->set_offline) |
| 115 | ret = gdrv->set_offline(gdev); |
| 116 | if (ret) |
| 117 | goto out; |
| 118 | |
| 119 | gdev->state = CCWGROUP_OFFLINE; |
| 120 | out: |
| 121 | atomic_set(&gdev->onoff, 0); |
| 122 | return ret; |
| 123 | } |
Sebastian Ott | 683c3dc | 2012-11-22 15:56:39 +0100 | [diff] [blame] | 124 | EXPORT_SYMBOL(ccwgroup_set_offline); |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 125 | |
Sebastian Ott | dbdf1af | 2011-10-30 15:16:52 +0100 | [diff] [blame] | 126 | static ssize_t ccwgroup_online_store(struct device *dev, |
| 127 | struct device_attribute *attr, |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 128 | const char *buf, size_t count) |
| 129 | { |
| 130 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 131 | unsigned long value; |
| 132 | int ret; |
| 133 | |
Sebastian Ott | d5b877f | 2013-12-16 10:56:46 +0100 | [diff] [blame] | 134 | device_lock(dev); |
| 135 | if (!dev->driver) { |
| 136 | ret = -EINVAL; |
| 137 | goto out; |
| 138 | } |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 139 | |
Jingoo Han | 0178722 | 2013-07-22 10:18:15 +0900 | [diff] [blame] | 140 | ret = kstrtoul(buf, 0, &value); |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 141 | if (ret) |
| 142 | goto out; |
| 143 | |
| 144 | if (value == 1) |
| 145 | ret = ccwgroup_set_online(gdev); |
| 146 | else if (value == 0) |
| 147 | ret = ccwgroup_set_offline(gdev); |
| 148 | else |
| 149 | ret = -EINVAL; |
| 150 | out: |
Sebastian Ott | d5b877f | 2013-12-16 10:56:46 +0100 | [diff] [blame] | 151 | device_unlock(dev); |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 152 | return (ret == 0) ? count : ret; |
| 153 | } |
| 154 | |
Sebastian Ott | dbdf1af | 2011-10-30 15:16:52 +0100 | [diff] [blame] | 155 | static ssize_t ccwgroup_online_show(struct device *dev, |
| 156 | struct device_attribute *attr, |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 157 | char *buf) |
| 158 | { |
| 159 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
| 160 | int online; |
| 161 | |
| 162 | online = (gdev->state == CCWGROUP_ONLINE) ? 1 : 0; |
| 163 | |
| 164 | return scnprintf(buf, PAGE_SIZE, "%d\n", online); |
| 165 | } |
| 166 | |
Peter Oberparleiter | c030175 | 2011-01-05 12:48:13 +0100 | [diff] [blame] | 167 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | * Provide an 'ungroup' attribute so the user can remove group devices no |
| 169 | * longer needed or accidentially created. Saves memory :) |
| 170 | */ |
Tejun Heo | 0b60f9e | 2014-02-03 14:03:04 -0500 | [diff] [blame] | 171 | static void ccwgroup_ungroup(struct ccwgroup_device *gdev) |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 172 | { |
Cornelia Huck | d76123e | 2007-04-27 16:01:37 +0200 | [diff] [blame] | 173 | mutex_lock(&gdev->reg_mutex); |
Cornelia Huck | 1a908c7 | 2008-01-26 14:10:50 +0100 | [diff] [blame] | 174 | if (device_is_registered(&gdev->dev)) { |
| 175 | __ccwgroup_remove_symlinks(gdev); |
Tejun Heo | 0b60f9e | 2014-02-03 14:03:04 -0500 | [diff] [blame] | 176 | device_unregister(&gdev->dev); |
Peter Oberparleiter | c030175 | 2011-01-05 12:48:13 +0100 | [diff] [blame] | 177 | __ccwgroup_remove_cdev_refs(gdev); |
Cornelia Huck | 1a908c7 | 2008-01-26 14:10:50 +0100 | [diff] [blame] | 178 | } |
Cornelia Huck | d76123e | 2007-04-27 16:01:37 +0200 | [diff] [blame] | 179 | mutex_unlock(&gdev->reg_mutex); |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 180 | } |
| 181 | |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 182 | static ssize_t ccwgroup_ungroup_store(struct device *dev, |
| 183 | struct device_attribute *attr, |
| 184 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 186 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
Sebastian Ott | 0310c8b | 2014-06-13 17:29:11 +0200 | [diff] [blame] | 187 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Peter Oberparleiter | c619d42 | 2008-12-25 13:39:04 +0100 | [diff] [blame] | 189 | /* Prevent concurrent online/offline processing and ungrouping. */ |
| 190 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
| 191 | return -EAGAIN; |
| 192 | if (gdev->state != CCWGROUP_OFFLINE) { |
| 193 | rc = -EINVAL; |
| 194 | goto out; |
| 195 | } |
Tejun Heo | 0b60f9e | 2014-02-03 14:03:04 -0500 | [diff] [blame] | 196 | |
| 197 | if (device_remove_file_self(dev, attr)) |
| 198 | ccwgroup_ungroup(gdev); |
Sebastian Ott | 0310c8b | 2014-06-13 17:29:11 +0200 | [diff] [blame] | 199 | else |
| 200 | rc = -ENODEV; |
Peter Oberparleiter | c619d42 | 2008-12-25 13:39:04 +0100 | [diff] [blame] | 201 | out: |
| 202 | if (rc) { |
Sebastian Ott | 0310c8b | 2014-06-13 17:29:11 +0200 | [diff] [blame] | 203 | /* Release onoff "lock" when ungrouping failed. */ |
| 204 | atomic_set(&gdev->onoff, 0); |
Peter Oberparleiter | c619d42 | 2008-12-25 13:39:04 +0100 | [diff] [blame] | 205 | return rc; |
| 206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | return count; |
| 208 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store); |
Sebastian Ott | dbdf1af | 2011-10-30 15:16:52 +0100 | [diff] [blame] | 210 | static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store); |
| 211 | |
| 212 | static struct attribute *ccwgroup_attrs[] = { |
| 213 | &dev_attr_online.attr, |
| 214 | &dev_attr_ungroup.attr, |
| 215 | NULL, |
| 216 | }; |
| 217 | static struct attribute_group ccwgroup_attr_group = { |
| 218 | .attrs = ccwgroup_attrs, |
| 219 | }; |
| 220 | static const struct attribute_group *ccwgroup_attr_groups[] = { |
| 221 | &ccwgroup_attr_group, |
| 222 | NULL, |
| 223 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
Tejun Heo | 0b60f9e | 2014-02-03 14:03:04 -0500 | [diff] [blame] | 225 | static void ccwgroup_ungroup_workfn(struct work_struct *work) |
| 226 | { |
| 227 | struct ccwgroup_device *gdev = |
| 228 | container_of(work, struct ccwgroup_device, ungroup_work); |
| 229 | |
| 230 | ccwgroup_ungroup(gdev); |
Sebastian Ott | 9280ddb | 2014-06-13 17:02:24 +0200 | [diff] [blame] | 231 | put_device(&gdev->dev); |
Tejun Heo | 0b60f9e | 2014-02-03 14:03:04 -0500 | [diff] [blame] | 232 | } |
| 233 | |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 234 | static void ccwgroup_release(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | { |
Peter Oberparleiter | c030175 | 2011-01-05 12:48:13 +0100 | [diff] [blame] | 236 | kfree(to_ccwgroupdev(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 239 | static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | { |
| 241 | char str[8]; |
| 242 | int i, rc; |
| 243 | |
| 244 | for (i = 0; i < gdev->count; i++) { |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 245 | rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, |
| 246 | &gdev->dev.kobj, "group_device"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | if (rc) { |
| 248 | for (--i; i >= 0; i--) |
| 249 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, |
| 250 | "group_device"); |
| 251 | return rc; |
| 252 | } |
| 253 | } |
| 254 | for (i = 0; i < gdev->count; i++) { |
| 255 | sprintf(str, "cdev%d", i); |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 256 | rc = sysfs_create_link(&gdev->dev.kobj, |
| 257 | &gdev->cdev[i]->dev.kobj, str); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | if (rc) { |
| 259 | for (--i; i >= 0; i--) { |
| 260 | sprintf(str, "cdev%d", i); |
| 261 | sysfs_remove_link(&gdev->dev.kobj, str); |
| 262 | } |
| 263 | for (i = 0; i < gdev->count; i++) |
| 264 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, |
| 265 | "group_device"); |
| 266 | return rc; |
| 267 | } |
| 268 | } |
| 269 | return 0; |
| 270 | } |
| 271 | |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 272 | static int __get_next_id(const char **buf, struct ccw_dev_id *id) |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 273 | { |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 274 | unsigned int cssid, ssid, devno; |
| 275 | int ret = 0, len; |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 276 | char *start, *end; |
| 277 | |
| 278 | start = (char *)*buf; |
| 279 | end = strchr(start, ','); |
| 280 | if (!end) { |
| 281 | /* Last entry. Strip trailing newline, if applicable. */ |
| 282 | end = strchr(start, '\n'); |
| 283 | if (end) |
| 284 | *end = '\0'; |
| 285 | len = strlen(start) + 1; |
| 286 | } else { |
| 287 | len = end - start + 1; |
| 288 | end++; |
| 289 | } |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 290 | if (len <= CCW_BUS_ID_SIZE) { |
| 291 | if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3) |
| 292 | ret = -EINVAL; |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 293 | } else |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 294 | ret = -EINVAL; |
| 295 | |
| 296 | if (!ret) { |
| 297 | id->ssid = ssid; |
| 298 | id->devno = devno; |
| 299 | } |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 300 | *buf = end; |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 301 | return ret; |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 302 | } |
| 303 | |
Cornelia Huck | b2ffd8e | 2007-10-12 16:11:17 +0200 | [diff] [blame] | 304 | /** |
Sebastian Ott | f2962da | 2012-05-15 17:49:12 +0200 | [diff] [blame] | 305 | * ccwgroup_create_dev() - create and register a ccw group device |
| 306 | * @parent: parent device for the new device |
Sebastian Ott | f2962da | 2012-05-15 17:49:12 +0200 | [diff] [blame] | 307 | * @gdrv: driver for the new group device |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 308 | * @num_devices: number of slave devices |
| 309 | * @buf: buffer containing comma separated bus ids of slave devices |
Cornelia Huck | b2ffd8e | 2007-10-12 16:11:17 +0200 | [diff] [blame] | 310 | * |
Sebastian Ott | f2962da | 2012-05-15 17:49:12 +0200 | [diff] [blame] | 311 | * Create and register a new ccw group device as a child of @parent. Slave |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 312 | * devices are obtained from the list of bus ids given in @buf. |
Cornelia Huck | b2ffd8e | 2007-10-12 16:11:17 +0200 | [diff] [blame] | 313 | * Returns: |
| 314 | * %0 on success and an error code on failure. |
| 315 | * Context: |
| 316 | * non-atomic |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | */ |
Sebastian Ott | 9814fdf | 2012-05-15 18:03:46 +0200 | [diff] [blame] | 318 | int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv, |
| 319 | int num_devices, const char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
| 321 | struct ccwgroup_device *gdev; |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 322 | struct ccw_dev_id dev_id; |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 323 | int rc, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 325 | gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]), |
| 326 | GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | if (!gdev) |
| 328 | return -ENOMEM; |
| 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | atomic_set(&gdev->onoff, 0); |
Cornelia Huck | d76123e | 2007-04-27 16:01:37 +0200 | [diff] [blame] | 331 | mutex_init(&gdev->reg_mutex); |
| 332 | mutex_lock(&gdev->reg_mutex); |
Tejun Heo | 0b60f9e | 2014-02-03 14:03:04 -0500 | [diff] [blame] | 333 | INIT_WORK(&gdev->ungroup_work, ccwgroup_ungroup_workfn); |
Peter Oberparleiter | 16f7f95 | 2008-08-21 19:46:36 +0200 | [diff] [blame] | 334 | gdev->count = num_devices; |
| 335 | gdev->dev.bus = &ccwgroup_bus_type; |
Sebastian Ott | f2962da | 2012-05-15 17:49:12 +0200 | [diff] [blame] | 336 | gdev->dev.parent = parent; |
Peter Oberparleiter | 16f7f95 | 2008-08-21 19:46:36 +0200 | [diff] [blame] | 337 | gdev->dev.release = ccwgroup_release; |
| 338 | device_initialize(&gdev->dev); |
| 339 | |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 340 | for (i = 0; i < num_devices && buf; i++) { |
| 341 | rc = __get_next_id(&buf, &dev_id); |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 342 | if (rc != 0) |
| 343 | goto error; |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 344 | gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id); |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 345 | /* |
| 346 | * All devices have to be of the same type in |
| 347 | * order to be grouped. |
| 348 | */ |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 349 | if (!gdev->cdev[i] || !gdev->cdev[i]->drv || |
| 350 | gdev->cdev[i]->drv != gdev->cdev[0]->drv || |
| 351 | gdev->cdev[i]->id.driver_info != |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | gdev->cdev[0]->id.driver_info) { |
| 353 | rc = -EINVAL; |
Cornelia Huck | d76123e | 2007-04-27 16:01:37 +0200 | [diff] [blame] | 354 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | /* Don't allow a device to belong to more than one group. */ |
Sebastian Ott | c560d10 | 2010-05-26 23:27:07 +0200 | [diff] [blame] | 357 | spin_lock_irq(gdev->cdev[i]->ccwlock); |
Cornelia Huck | db6a642 | 2008-01-26 14:10:46 +0100 | [diff] [blame] | 358 | if (dev_get_drvdata(&gdev->cdev[i]->dev)) { |
Sebastian Ott | c560d10 | 2010-05-26 23:27:07 +0200 | [diff] [blame] | 359 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | rc = -EINVAL; |
Cornelia Huck | d76123e | 2007-04-27 16:01:37 +0200 | [diff] [blame] | 361 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
Cornelia Huck | db6a642 | 2008-01-26 14:10:46 +0100 | [diff] [blame] | 363 | dev_set_drvdata(&gdev->cdev[i]->dev, gdev); |
Sebastian Ott | c560d10 | 2010-05-26 23:27:07 +0200 | [diff] [blame] | 364 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
Cornelia Huck | 1708822 | 2006-07-27 14:00:33 +0200 | [diff] [blame] | 365 | } |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 366 | /* Check for sufficient number of bus ids. */ |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 367 | if (i < num_devices) { |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 368 | rc = -EINVAL; |
| 369 | goto error; |
| 370 | } |
| 371 | /* Check for trailing stuff. */ |
Sebastian Ott | b7a610f | 2012-05-15 17:52:07 +0200 | [diff] [blame] | 372 | if (i == num_devices && strlen(buf) > 0) { |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 373 | rc = -EINVAL; |
| 374 | goto error; |
| 375 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
Cornelia Huck | 1bf5b28 | 2008-10-10 21:33:10 +0200 | [diff] [blame] | 377 | dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev)); |
Sebastian Ott | dbdf1af | 2011-10-30 15:16:52 +0100 | [diff] [blame] | 378 | gdev->dev.groups = ccwgroup_attr_groups; |
Sebastian Ott | f2962da | 2012-05-15 17:49:12 +0200 | [diff] [blame] | 379 | |
| 380 | if (gdrv) { |
| 381 | gdev->dev.driver = &gdrv->driver; |
| 382 | rc = gdrv->setup ? gdrv->setup(gdev) : 0; |
| 383 | if (rc) |
| 384 | goto error; |
| 385 | } |
Peter Oberparleiter | 16f7f95 | 2008-08-21 19:46:36 +0200 | [diff] [blame] | 386 | rc = device_add(&gdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | if (rc) |
Cornelia Huck | d76123e | 2007-04-27 16:01:37 +0200 | [diff] [blame] | 388 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | rc = __ccwgroup_create_symlinks(gdev); |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 390 | if (rc) { |
| 391 | device_del(&gdev->dev); |
| 392 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 394 | mutex_unlock(&gdev->reg_mutex); |
| 395 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | error: |
Ursula Braun | 022b660 | 2008-04-24 10:15:20 +0200 | [diff] [blame] | 397 | for (i = 0; i < num_devices; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (gdev->cdev[i]) { |
Sebastian Ott | c560d10 | 2010-05-26 23:27:07 +0200 | [diff] [blame] | 399 | spin_lock_irq(gdev->cdev[i]->ccwlock); |
Cornelia Huck | db6a642 | 2008-01-26 14:10:46 +0100 | [diff] [blame] | 400 | if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) |
| 401 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); |
Sebastian Ott | c560d10 | 2010-05-26 23:27:07 +0200 | [diff] [blame] | 402 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
Cornelia Huck | 1708822 | 2006-07-27 14:00:33 +0200 | [diff] [blame] | 403 | put_device(&gdev->cdev[i]->dev); |
Cornelia Huck | f26fd5d | 2008-09-16 09:32:18 -0700 | [diff] [blame] | 404 | gdev->cdev[i] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | } |
Cornelia Huck | d76123e | 2007-04-27 16:01:37 +0200 | [diff] [blame] | 406 | mutex_unlock(&gdev->reg_mutex); |
| 407 | put_device(&gdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | return rc; |
| 409 | } |
Sebastian Ott | f2962da | 2012-05-15 17:49:12 +0200 | [diff] [blame] | 410 | EXPORT_SYMBOL(ccwgroup_create_dev); |
| 411 | |
Sebastian Ott | e909074 | 2009-03-26 15:24:15 +0100 | [diff] [blame] | 412 | static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action, |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 413 | void *data) |
| 414 | { |
Tejun Heo | 0b60f9e | 2014-02-03 14:03:04 -0500 | [diff] [blame] | 415 | struct ccwgroup_device *gdev = to_ccwgroupdev(data); |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 416 | |
Sebastian Ott | 9280ddb | 2014-06-13 17:02:24 +0200 | [diff] [blame] | 417 | if (action == BUS_NOTIFY_UNBIND_DRIVER) { |
| 418 | get_device(&gdev->dev); |
Tejun Heo | 0b60f9e | 2014-02-03 14:03:04 -0500 | [diff] [blame] | 419 | schedule_work(&gdev->ungroup_work); |
Sebastian Ott | 9280ddb | 2014-06-13 17:02:24 +0200 | [diff] [blame] | 420 | } |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 421 | |
| 422 | return NOTIFY_OK; |
| 423 | } |
Sebastian Ott | e909074 | 2009-03-26 15:24:15 +0100 | [diff] [blame] | 424 | |
| 425 | static struct notifier_block ccwgroup_nb = { |
| 426 | .notifier_call = ccwgroup_notifier |
| 427 | }; |
| 428 | |
| 429 | static int __init init_ccwgroup(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | { |
Sebastian Ott | e909074 | 2009-03-26 15:24:15 +0100 | [diff] [blame] | 431 | int ret; |
| 432 | |
| 433 | ret = bus_register(&ccwgroup_bus_type); |
| 434 | if (ret) |
| 435 | return ret; |
| 436 | |
| 437 | ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb); |
| 438 | if (ret) |
| 439 | bus_unregister(&ccwgroup_bus_type); |
| 440 | |
| 441 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | |
Sebastian Ott | e909074 | 2009-03-26 15:24:15 +0100 | [diff] [blame] | 444 | static void __exit cleanup_ccwgroup(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | { |
Sebastian Ott | e909074 | 2009-03-26 15:24:15 +0100 | [diff] [blame] | 446 | bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb); |
| 447 | bus_unregister(&ccwgroup_bus_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | module_init(init_ccwgroup); |
| 451 | module_exit(cleanup_ccwgroup); |
| 452 | |
| 453 | /************************** driver stuff ******************************/ |
| 454 | |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 455 | static int ccwgroup_remove(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | { |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 457 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
| 458 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Sebastian Ott | 50f1548 | 2009-03-26 15:24:14 +0100 | [diff] [blame] | 460 | if (!dev->driver) |
| 461 | return 0; |
Sebastian Ott | 50f1548 | 2009-03-26 15:24:14 +0100 | [diff] [blame] | 462 | if (gdrv->remove) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | gdrv->remove(gdev); |
Sebastian Ott | 50f1548 | 2009-03-26 15:24:14 +0100 | [diff] [blame] | 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | return 0; |
| 466 | } |
| 467 | |
Cornelia Huck | 01bc8ad | 2008-02-05 16:50:36 +0100 | [diff] [blame] | 468 | static void ccwgroup_shutdown(struct device *dev) |
| 469 | { |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 470 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
| 471 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); |
Cornelia Huck | 01bc8ad | 2008-02-05 16:50:36 +0100 | [diff] [blame] | 472 | |
Sebastian Ott | 50f1548 | 2009-03-26 15:24:14 +0100 | [diff] [blame] | 473 | if (!dev->driver) |
| 474 | return; |
Sebastian Ott | 50f1548 | 2009-03-26 15:24:14 +0100 | [diff] [blame] | 475 | if (gdrv->shutdown) |
Cornelia Huck | 01bc8ad | 2008-02-05 16:50:36 +0100 | [diff] [blame] | 476 | gdrv->shutdown(gdev); |
| 477 | } |
| 478 | |
Sebastian Ott | 7e597a2 | 2009-06-16 10:30:21 +0200 | [diff] [blame] | 479 | static int ccwgroup_pm_prepare(struct device *dev) |
| 480 | { |
| 481 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
| 482 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); |
| 483 | |
| 484 | /* Fail while device is being set online/offline. */ |
| 485 | if (atomic_read(&gdev->onoff)) |
| 486 | return -EAGAIN; |
| 487 | |
| 488 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) |
| 489 | return 0; |
| 490 | |
| 491 | return gdrv->prepare ? gdrv->prepare(gdev) : 0; |
| 492 | } |
| 493 | |
| 494 | static void ccwgroup_pm_complete(struct device *dev) |
| 495 | { |
| 496 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
| 497 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); |
| 498 | |
| 499 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) |
| 500 | return; |
| 501 | |
| 502 | if (gdrv->complete) |
| 503 | gdrv->complete(gdev); |
| 504 | } |
| 505 | |
| 506 | static int ccwgroup_pm_freeze(struct device *dev) |
| 507 | { |
| 508 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
| 509 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); |
| 510 | |
| 511 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) |
| 512 | return 0; |
| 513 | |
| 514 | return gdrv->freeze ? gdrv->freeze(gdev) : 0; |
| 515 | } |
| 516 | |
| 517 | static int ccwgroup_pm_thaw(struct device *dev) |
| 518 | { |
| 519 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
| 520 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); |
| 521 | |
| 522 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) |
| 523 | return 0; |
| 524 | |
| 525 | return gdrv->thaw ? gdrv->thaw(gdev) : 0; |
| 526 | } |
| 527 | |
| 528 | static int ccwgroup_pm_restore(struct device *dev) |
| 529 | { |
| 530 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
| 531 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); |
| 532 | |
| 533 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) |
| 534 | return 0; |
| 535 | |
| 536 | return gdrv->restore ? gdrv->restore(gdev) : 0; |
| 537 | } |
| 538 | |
Alexey Dobriyan | 4714521 | 2009-12-14 18:00:08 -0800 | [diff] [blame] | 539 | static const struct dev_pm_ops ccwgroup_pm_ops = { |
Sebastian Ott | 7e597a2 | 2009-06-16 10:30:21 +0200 | [diff] [blame] | 540 | .prepare = ccwgroup_pm_prepare, |
| 541 | .complete = ccwgroup_pm_complete, |
| 542 | .freeze = ccwgroup_pm_freeze, |
| 543 | .thaw = ccwgroup_pm_thaw, |
| 544 | .restore = ccwgroup_pm_restore, |
| 545 | }; |
| 546 | |
Russell King | f9ccf45 | 2006-01-05 14:42:09 +0000 | [diff] [blame] | 547 | static struct bus_type ccwgroup_bus_type = { |
| 548 | .name = "ccwgroup", |
Russell King | f9ccf45 | 2006-01-05 14:42:09 +0000 | [diff] [blame] | 549 | .remove = ccwgroup_remove, |
Cornelia Huck | 01bc8ad | 2008-02-05 16:50:36 +0100 | [diff] [blame] | 550 | .shutdown = ccwgroup_shutdown, |
Sebastian Ott | 7e597a2 | 2009-06-16 10:30:21 +0200 | [diff] [blame] | 551 | .pm = &ccwgroup_pm_ops, |
Russell King | f9ccf45 | 2006-01-05 14:42:09 +0000 | [diff] [blame] | 552 | }; |
| 553 | |
Cornelia Huck | b2ffd8e | 2007-10-12 16:11:17 +0200 | [diff] [blame] | 554 | /** |
| 555 | * ccwgroup_driver_register() - register a ccw group driver |
| 556 | * @cdriver: driver to be registered |
| 557 | * |
| 558 | * This function is mainly a wrapper around driver_register(). |
| 559 | */ |
| 560 | int ccwgroup_driver_register(struct ccwgroup_driver *cdriver) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | { |
| 562 | /* register our new driver with the core */ |
Heiko Carstens | 292888c | 2006-08-30 14:33:35 +0200 | [diff] [blame] | 563 | cdriver->driver.bus = &ccwgroup_bus_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
| 565 | return driver_register(&cdriver->driver); |
| 566 | } |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 567 | EXPORT_SYMBOL(ccwgroup_driver_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 569 | static int __ccwgroup_match_all(struct device *dev, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | { |
Cornelia Huck | 887ab59 | 2006-06-29 14:56:52 +0200 | [diff] [blame] | 571 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | } |
| 573 | |
Cornelia Huck | b2ffd8e | 2007-10-12 16:11:17 +0200 | [diff] [blame] | 574 | /** |
| 575 | * ccwgroup_driver_unregister() - deregister a ccw group driver |
| 576 | * @cdriver: driver to be deregistered |
| 577 | * |
| 578 | * This function is mainly a wrapper around driver_unregister(). |
| 579 | */ |
| 580 | void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | { |
Cornelia Huck | 887ab59 | 2006-06-29 14:56:52 +0200 | [diff] [blame] | 582 | struct device *dev; |
| 583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | /* We don't want ccwgroup devices to live longer than their driver. */ |
Cornelia Huck | 887ab59 | 2006-06-29 14:56:52 +0200 | [diff] [blame] | 585 | while ((dev = driver_find_device(&cdriver->driver, NULL, NULL, |
| 586 | __ccwgroup_match_all))) { |
Cornelia Huck | d76123e | 2007-04-27 16:01:37 +0200 | [diff] [blame] | 587 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
| 588 | |
Sebastian Ott | fa73eb4 | 2014-06-13 18:11:37 +0200 | [diff] [blame^] | 589 | ccwgroup_ungroup(gdev); |
Cornelia Huck | 887ab59 | 2006-06-29 14:56:52 +0200 | [diff] [blame] | 590 | put_device(dev); |
| 591 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | driver_unregister(&cdriver->driver); |
| 593 | } |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 594 | EXPORT_SYMBOL(ccwgroup_driver_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
Cornelia Huck | b2ffd8e | 2007-10-12 16:11:17 +0200 | [diff] [blame] | 596 | /** |
| 597 | * ccwgroup_probe_ccwdev() - probe function for slave devices |
| 598 | * @cdev: ccw device to be probed |
| 599 | * |
| 600 | * This is a dummy probe function for ccw devices that are slave devices in |
| 601 | * a ccw group device. |
| 602 | * Returns: |
| 603 | * always %0 |
| 604 | */ |
| 605 | int ccwgroup_probe_ccwdev(struct ccw_device *cdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | { |
| 607 | return 0; |
| 608 | } |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 609 | EXPORT_SYMBOL(ccwgroup_probe_ccwdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
Cornelia Huck | b2ffd8e | 2007-10-12 16:11:17 +0200 | [diff] [blame] | 611 | /** |
| 612 | * ccwgroup_remove_ccwdev() - remove function for slave devices |
| 613 | * @cdev: ccw device to be removed |
| 614 | * |
| 615 | * This is a remove function for ccw devices that are slave devices in a ccw |
| 616 | * group device. It sets the ccw device offline and also deregisters the |
| 617 | * embedding ccw group device. |
| 618 | */ |
| 619 | void ccwgroup_remove_ccwdev(struct ccw_device *cdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | { |
| 621 | struct ccwgroup_device *gdev; |
| 622 | |
| 623 | /* Ignore offlining errors, device is gone anyway. */ |
| 624 | ccw_device_set_offline(cdev); |
| 625 | /* If one of its devices is gone, the whole group is done for. */ |
Peter Oberparleiter | c030175 | 2011-01-05 12:48:13 +0100 | [diff] [blame] | 626 | spin_lock_irq(cdev->ccwlock); |
| 627 | gdev = dev_get_drvdata(&cdev->dev); |
| 628 | if (!gdev) { |
| 629 | spin_unlock_irq(cdev->ccwlock); |
| 630 | return; |
| 631 | } |
| 632 | /* Get ccwgroup device reference for local processing. */ |
| 633 | get_device(&gdev->dev); |
| 634 | spin_unlock_irq(cdev->ccwlock); |
| 635 | /* Unregister group device. */ |
Sebastian Ott | fa73eb4 | 2014-06-13 18:11:37 +0200 | [diff] [blame^] | 636 | ccwgroup_ungroup(gdev); |
Peter Oberparleiter | c030175 | 2011-01-05 12:48:13 +0100 | [diff] [blame] | 637 | /* Release ccwgroup device reference for local processing. */ |
| 638 | put_device(&gdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | EXPORT_SYMBOL(ccwgroup_remove_ccwdev); |
Sebastian Ott | dad572e3 | 2011-10-30 15:16:53 +0100 | [diff] [blame] | 641 | MODULE_LICENSE("GPL"); |