Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/cio/device.c |
| 3 | * bus driver for ccw devices |
| 4 | * $Revision: 1.131 $ |
| 5 | * |
| 6 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, |
| 7 | * IBM Corporation |
| 8 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
| 9 | * Cornelia Huck (cohuck@de.ibm.com) |
| 10 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 11 | */ |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/spinlock.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/list.h> |
| 20 | #include <linux/device.h> |
| 21 | #include <linux/workqueue.h> |
| 22 | |
| 23 | #include <asm/ccwdev.h> |
| 24 | #include <asm/cio.h> |
| 25 | |
| 26 | #include "cio.h" |
| 27 | #include "css.h" |
| 28 | #include "device.h" |
| 29 | #include "ioasm.h" |
| 30 | |
| 31 | /******************* bus type handling ***********************/ |
| 32 | |
| 33 | /* The Linux driver model distinguishes between a bus type and |
| 34 | * the bus itself. Of course we only have one channel |
| 35 | * subsystem driver and one channel system per machine, but |
| 36 | * we still use the abstraction. T.R. says it's a good idea. */ |
| 37 | static int |
| 38 | ccw_bus_match (struct device * dev, struct device_driver * drv) |
| 39 | { |
| 40 | struct ccw_device *cdev = to_ccwdev(dev); |
| 41 | struct ccw_driver *cdrv = to_ccwdrv(drv); |
| 42 | const struct ccw_device_id *ids = cdrv->ids, *found; |
| 43 | |
| 44 | if (!ids) |
| 45 | return 0; |
| 46 | |
| 47 | found = ccw_device_id_match(ids, &cdev->id); |
| 48 | if (!found) |
| 49 | return 0; |
| 50 | |
| 51 | cdev->id.driver_info = found->driver_info; |
| 52 | |
| 53 | return 1; |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * Hotplugging interface for ccw devices. |
| 58 | * Heavily modeled on pci and usb hotplug. |
| 59 | */ |
| 60 | static int |
| 61 | ccw_hotplug (struct device *dev, char **envp, int num_envp, |
| 62 | char *buffer, int buffer_size) |
| 63 | { |
| 64 | struct ccw_device *cdev = to_ccwdev(dev); |
| 65 | int i = 0; |
| 66 | int length = 0; |
| 67 | |
| 68 | if (!cdev) |
| 69 | return -ENODEV; |
| 70 | |
| 71 | /* what we want to pass to /sbin/hotplug */ |
| 72 | |
| 73 | envp[i++] = buffer; |
| 74 | length += scnprintf(buffer, buffer_size - length, "CU_TYPE=%04X", |
| 75 | cdev->id.cu_type); |
| 76 | if ((buffer_size - length <= 0) || (i >= num_envp)) |
| 77 | return -ENOMEM; |
| 78 | ++length; |
| 79 | buffer += length; |
| 80 | |
| 81 | envp[i++] = buffer; |
| 82 | length += scnprintf(buffer, buffer_size - length, "CU_MODEL=%02X", |
| 83 | cdev->id.cu_model); |
| 84 | if ((buffer_size - length <= 0) || (i >= num_envp)) |
| 85 | return -ENOMEM; |
| 86 | ++length; |
| 87 | buffer += length; |
| 88 | |
| 89 | /* The next two can be zero, that's ok for us */ |
| 90 | envp[i++] = buffer; |
| 91 | length += scnprintf(buffer, buffer_size - length, "DEV_TYPE=%04X", |
| 92 | cdev->id.dev_type); |
| 93 | if ((buffer_size - length <= 0) || (i >= num_envp)) |
| 94 | return -ENOMEM; |
| 95 | ++length; |
| 96 | buffer += length; |
| 97 | |
| 98 | envp[i++] = buffer; |
| 99 | length += scnprintf(buffer, buffer_size - length, "DEV_MODEL=%02X", |
| 100 | cdev->id.dev_model); |
| 101 | if ((buffer_size - length <= 0) || (i >= num_envp)) |
| 102 | return -ENOMEM; |
| 103 | |
| 104 | envp[i] = 0; |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | struct bus_type ccw_bus_type = { |
| 110 | .name = "ccw", |
| 111 | .match = &ccw_bus_match, |
| 112 | .hotplug = &ccw_hotplug, |
| 113 | }; |
| 114 | |
| 115 | static int io_subchannel_probe (struct device *); |
| 116 | static int io_subchannel_remove (struct device *); |
| 117 | void io_subchannel_irq (struct device *); |
| 118 | static int io_subchannel_notify(struct device *, int); |
| 119 | static void io_subchannel_verify(struct device *); |
| 120 | static void io_subchannel_ioterm(struct device *); |
| 121 | static void io_subchannel_shutdown(struct device *); |
| 122 | |
| 123 | struct css_driver io_subchannel_driver = { |
| 124 | .subchannel_type = SUBCHANNEL_TYPE_IO, |
| 125 | .drv = { |
| 126 | .name = "io_subchannel", |
| 127 | .bus = &css_bus_type, |
| 128 | .probe = &io_subchannel_probe, |
| 129 | .remove = &io_subchannel_remove, |
| 130 | .shutdown = &io_subchannel_shutdown, |
| 131 | }, |
| 132 | .irq = io_subchannel_irq, |
| 133 | .notify = io_subchannel_notify, |
| 134 | .verify = io_subchannel_verify, |
| 135 | .termination = io_subchannel_ioterm, |
| 136 | }; |
| 137 | |
| 138 | struct workqueue_struct *ccw_device_work; |
| 139 | struct workqueue_struct *ccw_device_notify_work; |
| 140 | static wait_queue_head_t ccw_device_init_wq; |
| 141 | static atomic_t ccw_device_init_count; |
| 142 | |
| 143 | static int __init |
| 144 | init_ccw_bus_type (void) |
| 145 | { |
| 146 | int ret; |
| 147 | |
| 148 | init_waitqueue_head(&ccw_device_init_wq); |
| 149 | atomic_set(&ccw_device_init_count, 0); |
| 150 | |
| 151 | ccw_device_work = create_singlethread_workqueue("cio"); |
| 152 | if (!ccw_device_work) |
| 153 | return -ENOMEM; /* FIXME: better errno ? */ |
| 154 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); |
| 155 | if (!ccw_device_notify_work) { |
| 156 | ret = -ENOMEM; /* FIXME: better errno ? */ |
| 157 | goto out_err; |
| 158 | } |
| 159 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); |
| 160 | if (!slow_path_wq) { |
| 161 | ret = -ENOMEM; /* FIXME: better errno ? */ |
| 162 | goto out_err; |
| 163 | } |
| 164 | if ((ret = bus_register (&ccw_bus_type))) |
| 165 | goto out_err; |
| 166 | |
| 167 | if ((ret = driver_register(&io_subchannel_driver.drv))) |
| 168 | goto out_err; |
| 169 | |
| 170 | wait_event(ccw_device_init_wq, |
| 171 | atomic_read(&ccw_device_init_count) == 0); |
| 172 | flush_workqueue(ccw_device_work); |
| 173 | return 0; |
| 174 | out_err: |
| 175 | if (ccw_device_work) |
| 176 | destroy_workqueue(ccw_device_work); |
| 177 | if (ccw_device_notify_work) |
| 178 | destroy_workqueue(ccw_device_notify_work); |
| 179 | if (slow_path_wq) |
| 180 | destroy_workqueue(slow_path_wq); |
| 181 | return ret; |
| 182 | } |
| 183 | |
| 184 | static void __exit |
| 185 | cleanup_ccw_bus_type (void) |
| 186 | { |
| 187 | driver_unregister(&io_subchannel_driver.drv); |
| 188 | bus_unregister(&ccw_bus_type); |
| 189 | destroy_workqueue(ccw_device_notify_work); |
| 190 | destroy_workqueue(ccw_device_work); |
| 191 | } |
| 192 | |
| 193 | subsys_initcall(init_ccw_bus_type); |
| 194 | module_exit(cleanup_ccw_bus_type); |
| 195 | |
| 196 | /************************ device handling **************************/ |
| 197 | |
| 198 | /* |
| 199 | * A ccw_device has some interfaces in sysfs in addition to the |
| 200 | * standard ones. |
| 201 | * The following entries are designed to export the information which |
| 202 | * resided in 2.4 in /proc/subchannels. Subchannel and device number |
| 203 | * are obvious, so they don't have an entry :) |
| 204 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? |
| 205 | */ |
| 206 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 207 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | { |
| 209 | struct subchannel *sch = to_subchannel(dev); |
| 210 | struct ssd_info *ssd = &sch->ssd_info; |
| 211 | ssize_t ret = 0; |
| 212 | int chp; |
| 213 | |
| 214 | for (chp = 0; chp < 8; chp++) |
| 215 | ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]); |
| 216 | |
| 217 | ret += sprintf (buf+ret, "\n"); |
| 218 | return min((ssize_t)PAGE_SIZE, ret); |
| 219 | } |
| 220 | |
| 221 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 222 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | { |
| 224 | struct subchannel *sch = to_subchannel(dev); |
| 225 | struct pmcw *pmcw = &sch->schib.pmcw; |
| 226 | |
| 227 | return sprintf (buf, "%02x %02x %02x\n", |
| 228 | pmcw->pim, pmcw->pam, pmcw->pom); |
| 229 | } |
| 230 | |
| 231 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 232 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
| 234 | struct ccw_device *cdev = to_ccwdev(dev); |
| 235 | struct ccw_device_id *id = &(cdev->id); |
| 236 | |
| 237 | if (id->dev_type != 0) |
| 238 | return sprintf(buf, "%04x/%02x\n", |
| 239 | id->dev_type, id->dev_model); |
| 240 | else |
| 241 | return sprintf(buf, "n/a\n"); |
| 242 | } |
| 243 | |
| 244 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 245 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | { |
| 247 | struct ccw_device *cdev = to_ccwdev(dev); |
| 248 | struct ccw_device_id *id = &(cdev->id); |
| 249 | |
| 250 | return sprintf(buf, "%04x/%02x\n", |
| 251 | id->cu_type, id->cu_model); |
| 252 | } |
| 253 | |
| 254 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 255 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | { |
| 257 | struct ccw_device *cdev = to_ccwdev(dev); |
| 258 | |
| 259 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); |
| 260 | } |
| 261 | |
| 262 | static void |
| 263 | ccw_device_remove_disconnected(struct ccw_device *cdev) |
| 264 | { |
| 265 | struct subchannel *sch; |
| 266 | /* |
| 267 | * Forced offline in disconnected state means |
| 268 | * 'throw away device'. |
| 269 | */ |
| 270 | sch = to_subchannel(cdev->dev.parent); |
| 271 | device_unregister(&sch->dev); |
| 272 | /* Reset intparm to zeroes. */ |
| 273 | sch->schib.pmcw.intparm = 0; |
| 274 | cio_modify(sch); |
| 275 | put_device(&sch->dev); |
| 276 | } |
| 277 | |
| 278 | int |
| 279 | ccw_device_set_offline(struct ccw_device *cdev) |
| 280 | { |
| 281 | int ret; |
| 282 | |
| 283 | if (!cdev) |
| 284 | return -ENODEV; |
| 285 | if (!cdev->online || !cdev->drv) |
| 286 | return -EINVAL; |
| 287 | |
| 288 | if (cdev->drv->set_offline) { |
| 289 | ret = cdev->drv->set_offline(cdev); |
| 290 | if (ret != 0) |
| 291 | return ret; |
| 292 | } |
| 293 | cdev->online = 0; |
| 294 | spin_lock_irq(cdev->ccwlock); |
| 295 | ret = ccw_device_offline(cdev); |
| 296 | if (ret == -ENODEV) { |
| 297 | if (cdev->private->state != DEV_STATE_NOT_OPER) { |
| 298 | cdev->private->state = DEV_STATE_OFFLINE; |
| 299 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
| 300 | } |
| 301 | spin_unlock_irq(cdev->ccwlock); |
| 302 | return ret; |
| 303 | } |
| 304 | spin_unlock_irq(cdev->ccwlock); |
| 305 | if (ret == 0) |
| 306 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
| 307 | else { |
| 308 | pr_debug("ccw_device_offline returned %d, device %s\n", |
| 309 | ret, cdev->dev.bus_id); |
| 310 | cdev->online = 1; |
| 311 | } |
| 312 | return ret; |
| 313 | } |
| 314 | |
| 315 | int |
| 316 | ccw_device_set_online(struct ccw_device *cdev) |
| 317 | { |
| 318 | int ret; |
| 319 | |
| 320 | if (!cdev) |
| 321 | return -ENODEV; |
| 322 | if (cdev->online || !cdev->drv) |
| 323 | return -EINVAL; |
| 324 | |
| 325 | spin_lock_irq(cdev->ccwlock); |
| 326 | ret = ccw_device_online(cdev); |
| 327 | spin_unlock_irq(cdev->ccwlock); |
| 328 | if (ret == 0) |
| 329 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
| 330 | else { |
| 331 | pr_debug("ccw_device_online returned %d, device %s\n", |
| 332 | ret, cdev->dev.bus_id); |
| 333 | return ret; |
| 334 | } |
| 335 | if (cdev->private->state != DEV_STATE_ONLINE) |
| 336 | return -ENODEV; |
| 337 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { |
| 338 | cdev->online = 1; |
| 339 | return 0; |
| 340 | } |
| 341 | spin_lock_irq(cdev->ccwlock); |
| 342 | ret = ccw_device_offline(cdev); |
| 343 | spin_unlock_irq(cdev->ccwlock); |
| 344 | if (ret == 0) |
| 345 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
| 346 | else |
| 347 | pr_debug("ccw_device_offline returned %d, device %s\n", |
| 348 | ret, cdev->dev.bus_id); |
| 349 | return (ret = 0) ? -ENODEV : ret; |
| 350 | } |
| 351 | |
| 352 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 353 | online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
| 355 | struct ccw_device *cdev = to_ccwdev(dev); |
| 356 | int i, force, ret; |
| 357 | char *tmp; |
| 358 | |
| 359 | if (atomic_compare_and_swap(0, 1, &cdev->private->onoff)) |
| 360 | return -EAGAIN; |
| 361 | |
| 362 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { |
| 363 | atomic_set(&cdev->private->onoff, 0); |
| 364 | return -EINVAL; |
| 365 | } |
| 366 | if (!strncmp(buf, "force\n", count)) { |
| 367 | force = 1; |
| 368 | i = 1; |
| 369 | } else { |
| 370 | force = 0; |
| 371 | i = simple_strtoul(buf, &tmp, 16); |
| 372 | } |
| 373 | if (i == 1) { |
| 374 | /* Do device recognition, if needed. */ |
| 375 | if (cdev->id.cu_type == 0) { |
| 376 | ret = ccw_device_recognition(cdev); |
| 377 | if (ret) { |
| 378 | printk(KERN_WARNING"Couldn't start recognition " |
| 379 | "for device %s (ret=%d)\n", |
| 380 | cdev->dev.bus_id, ret); |
| 381 | goto out; |
| 382 | } |
| 383 | wait_event(cdev->private->wait_q, |
| 384 | cdev->private->flags.recog_done); |
| 385 | } |
| 386 | if (cdev->drv && cdev->drv->set_online) |
| 387 | ccw_device_set_online(cdev); |
| 388 | } else if (i == 0) { |
| 389 | if (cdev->private->state == DEV_STATE_DISCONNECTED) |
| 390 | ccw_device_remove_disconnected(cdev); |
| 391 | else if (cdev->drv && cdev->drv->set_offline) |
| 392 | ccw_device_set_offline(cdev); |
| 393 | } |
| 394 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
| 395 | ret = ccw_device_stlck(cdev); |
| 396 | if (ret) { |
| 397 | printk(KERN_WARNING"ccw_device_stlck for device %s " |
| 398 | "returned %d!\n", cdev->dev.bus_id, ret); |
| 399 | goto out; |
| 400 | } |
| 401 | /* Do device recognition, if needed. */ |
| 402 | if (cdev->id.cu_type == 0) { |
| 403 | cdev->private->state = DEV_STATE_NOT_OPER; |
| 404 | ret = ccw_device_recognition(cdev); |
| 405 | if (ret) { |
| 406 | printk(KERN_WARNING"Couldn't start recognition " |
| 407 | "for device %s (ret=%d)\n", |
| 408 | cdev->dev.bus_id, ret); |
| 409 | goto out; |
| 410 | } |
| 411 | wait_event(cdev->private->wait_q, |
| 412 | cdev->private->flags.recog_done); |
| 413 | } |
| 414 | if (cdev->drv && cdev->drv->set_online) |
| 415 | ccw_device_set_online(cdev); |
| 416 | } |
| 417 | out: |
| 418 | if (cdev->drv) |
| 419 | module_put(cdev->drv->owner); |
| 420 | atomic_set(&cdev->private->onoff, 0); |
| 421 | return count; |
| 422 | } |
| 423 | |
| 424 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 425 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | { |
| 427 | struct ccw_device *cdev = to_ccwdev(dev); |
| 428 | struct subchannel *sch; |
| 429 | |
| 430 | switch (cdev->private->state) { |
| 431 | case DEV_STATE_BOXED: |
| 432 | return sprintf(buf, "boxed\n"); |
| 433 | case DEV_STATE_DISCONNECTED: |
| 434 | case DEV_STATE_DISCONNECTED_SENSE_ID: |
| 435 | case DEV_STATE_NOT_OPER: |
| 436 | sch = to_subchannel(dev->parent); |
| 437 | if (!sch->lpm) |
| 438 | return sprintf(buf, "no path\n"); |
| 439 | else |
| 440 | return sprintf(buf, "no device\n"); |
| 441 | default: |
| 442 | /* All other states considered fine. */ |
| 443 | return sprintf(buf, "good\n"); |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); |
| 448 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); |
| 449 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); |
| 450 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); |
| 451 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
| 452 | extern struct device_attribute dev_attr_cmb_enable; |
| 453 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
| 454 | |
| 455 | static struct attribute * subch_attrs[] = { |
| 456 | &dev_attr_chpids.attr, |
| 457 | &dev_attr_pimpampom.attr, |
| 458 | NULL, |
| 459 | }; |
| 460 | |
| 461 | static struct attribute_group subch_attr_group = { |
| 462 | .attrs = subch_attrs, |
| 463 | }; |
| 464 | |
| 465 | static inline int |
| 466 | subchannel_add_files (struct device *dev) |
| 467 | { |
| 468 | return sysfs_create_group(&dev->kobj, &subch_attr_group); |
| 469 | } |
| 470 | |
| 471 | static struct attribute * ccwdev_attrs[] = { |
| 472 | &dev_attr_devtype.attr, |
| 473 | &dev_attr_cutype.attr, |
| 474 | &dev_attr_online.attr, |
| 475 | &dev_attr_cmb_enable.attr, |
| 476 | &dev_attr_availability.attr, |
| 477 | NULL, |
| 478 | }; |
| 479 | |
| 480 | static struct attribute_group ccwdev_attr_group = { |
| 481 | .attrs = ccwdev_attrs, |
| 482 | }; |
| 483 | |
| 484 | static inline int |
| 485 | device_add_files (struct device *dev) |
| 486 | { |
| 487 | return sysfs_create_group(&dev->kobj, &ccwdev_attr_group); |
| 488 | } |
| 489 | |
| 490 | static inline void |
| 491 | device_remove_files(struct device *dev) |
| 492 | { |
| 493 | sysfs_remove_group(&dev->kobj, &ccwdev_attr_group); |
| 494 | } |
| 495 | |
| 496 | /* this is a simple abstraction for device_register that sets the |
| 497 | * correct bus type and adds the bus specific files */ |
| 498 | int |
| 499 | ccw_device_register(struct ccw_device *cdev) |
| 500 | { |
| 501 | struct device *dev = &cdev->dev; |
| 502 | int ret; |
| 503 | |
| 504 | dev->bus = &ccw_bus_type; |
| 505 | |
| 506 | if ((ret = device_add(dev))) |
| 507 | return ret; |
| 508 | |
| 509 | set_bit(1, &cdev->private->registered); |
| 510 | if ((ret = device_add_files(dev))) { |
| 511 | if (test_and_clear_bit(1, &cdev->private->registered)) |
| 512 | device_del(dev); |
| 513 | } |
| 514 | return ret; |
| 515 | } |
| 516 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 517 | struct match_data { |
| 518 | unsigned int devno; |
| 519 | struct ccw_device * sibling; |
| 520 | }; |
| 521 | |
| 522 | static int |
| 523 | match_devno(struct device * dev, void * data) |
| 524 | { |
| 525 | struct match_data * d = (struct match_data *)data; |
| 526 | struct ccw_device * cdev; |
| 527 | |
| 528 | cdev = to_ccwdev(dev); |
| 529 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && |
| 530 | (cdev->private->devno == d->devno) && |
| 531 | (cdev != d->sibling)) { |
| 532 | cdev->private->state = DEV_STATE_NOT_OPER; |
| 533 | return 1; |
| 534 | } |
| 535 | return 0; |
| 536 | } |
| 537 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | static struct ccw_device * |
| 539 | get_disc_ccwdev_by_devno(unsigned int devno, struct ccw_device *sibling) |
| 540 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | struct device *dev; |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 542 | struct match_data data = { |
| 543 | .devno = devno, |
| 544 | .sibling = sibling, |
| 545 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 547 | dev = bus_find_device(&css_bus_type, NULL, &data, match_devno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 549 | return dev ? to_ccwdev(dev) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } |
| 551 | |
| 552 | static void |
| 553 | ccw_device_add_changed(void *data) |
| 554 | { |
| 555 | |
| 556 | struct ccw_device *cdev; |
| 557 | |
| 558 | cdev = (struct ccw_device *)data; |
| 559 | if (device_add(&cdev->dev)) { |
| 560 | put_device(&cdev->dev); |
| 561 | return; |
| 562 | } |
| 563 | set_bit(1, &cdev->private->registered); |
| 564 | if (device_add_files(&cdev->dev)) { |
| 565 | if (test_and_clear_bit(1, &cdev->private->registered)) |
| 566 | device_unregister(&cdev->dev); |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | extern int css_get_ssd_info(struct subchannel *sch); |
| 571 | |
| 572 | void |
| 573 | ccw_device_do_unreg_rereg(void *data) |
| 574 | { |
| 575 | struct ccw_device *cdev; |
| 576 | struct subchannel *sch; |
| 577 | int need_rename; |
| 578 | |
| 579 | cdev = (struct ccw_device *)data; |
| 580 | sch = to_subchannel(cdev->dev.parent); |
| 581 | if (cdev->private->devno != sch->schib.pmcw.dev) { |
| 582 | /* |
| 583 | * The device number has changed. This is usually only when |
| 584 | * a device has been detached under VM and then re-appeared |
| 585 | * on another subchannel because of a different attachment |
| 586 | * order than before. Ideally, we should should just switch |
| 587 | * subchannels, but unfortunately, this is not possible with |
| 588 | * the current implementation. |
| 589 | * Instead, we search for the old subchannel for this device |
| 590 | * number and deregister so there are no collisions with the |
| 591 | * newly registered ccw_device. |
| 592 | * FIXME: Find another solution so the block layer doesn't |
| 593 | * get possibly sick... |
| 594 | */ |
| 595 | struct ccw_device *other_cdev; |
| 596 | |
| 597 | need_rename = 1; |
| 598 | other_cdev = get_disc_ccwdev_by_devno(sch->schib.pmcw.dev, |
| 599 | cdev); |
| 600 | if (other_cdev) { |
| 601 | struct subchannel *other_sch; |
| 602 | |
| 603 | other_sch = to_subchannel(other_cdev->dev.parent); |
| 604 | if (get_device(&other_sch->dev)) { |
| 605 | stsch(other_sch->irq, &other_sch->schib); |
| 606 | if (other_sch->schib.pmcw.dnv) { |
| 607 | other_sch->schib.pmcw.intparm = 0; |
| 608 | cio_modify(other_sch); |
| 609 | } |
| 610 | device_unregister(&other_sch->dev); |
| 611 | } |
| 612 | } |
| 613 | /* Update ssd info here. */ |
| 614 | css_get_ssd_info(sch); |
| 615 | cdev->private->devno = sch->schib.pmcw.dev; |
| 616 | } else |
| 617 | need_rename = 0; |
| 618 | device_remove_files(&cdev->dev); |
| 619 | if (test_and_clear_bit(1, &cdev->private->registered)) |
| 620 | device_del(&cdev->dev); |
| 621 | if (need_rename) |
| 622 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", |
| 623 | sch->schib.pmcw.dev); |
| 624 | PREPARE_WORK(&cdev->private->kick_work, |
| 625 | ccw_device_add_changed, (void *)cdev); |
| 626 | queue_work(ccw_device_work, &cdev->private->kick_work); |
| 627 | } |
| 628 | |
| 629 | static void |
| 630 | ccw_device_release(struct device *dev) |
| 631 | { |
| 632 | struct ccw_device *cdev; |
| 633 | |
| 634 | cdev = to_ccwdev(dev); |
| 635 | kfree(cdev->private); |
| 636 | kfree(cdev); |
| 637 | } |
| 638 | |
| 639 | /* |
| 640 | * Register recognized device. |
| 641 | */ |
| 642 | static void |
| 643 | io_subchannel_register(void *data) |
| 644 | { |
| 645 | struct ccw_device *cdev; |
| 646 | struct subchannel *sch; |
| 647 | int ret; |
| 648 | unsigned long flags; |
| 649 | |
| 650 | cdev = (struct ccw_device *) data; |
| 651 | sch = to_subchannel(cdev->dev.parent); |
| 652 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 653 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | bus_rescan_devices(&ccw_bus_type); |
| 655 | goto out; |
| 656 | } |
| 657 | /* make it known to the system */ |
| 658 | ret = ccw_device_register(cdev); |
| 659 | if (ret) { |
| 660 | printk (KERN_WARNING "%s: could not register %s\n", |
| 661 | __func__, cdev->dev.bus_id); |
| 662 | put_device(&cdev->dev); |
| 663 | spin_lock_irqsave(&sch->lock, flags); |
| 664 | sch->dev.driver_data = NULL; |
| 665 | spin_unlock_irqrestore(&sch->lock, flags); |
| 666 | kfree (cdev->private); |
| 667 | kfree (cdev); |
| 668 | put_device(&sch->dev); |
| 669 | if (atomic_dec_and_test(&ccw_device_init_count)) |
| 670 | wake_up(&ccw_device_init_wq); |
| 671 | return; |
| 672 | } |
| 673 | |
| 674 | ret = subchannel_add_files(cdev->dev.parent); |
| 675 | if (ret) |
| 676 | printk(KERN_WARNING "%s: could not add attributes to %s\n", |
| 677 | __func__, sch->dev.bus_id); |
| 678 | put_device(&cdev->dev); |
| 679 | out: |
| 680 | cdev->private->flags.recog_done = 1; |
| 681 | put_device(&sch->dev); |
| 682 | wake_up(&cdev->private->wait_q); |
| 683 | if (atomic_dec_and_test(&ccw_device_init_count)) |
| 684 | wake_up(&ccw_device_init_wq); |
| 685 | } |
| 686 | |
| 687 | void |
| 688 | ccw_device_call_sch_unregister(void *data) |
| 689 | { |
| 690 | struct ccw_device *cdev = data; |
| 691 | struct subchannel *sch; |
| 692 | |
| 693 | sch = to_subchannel(cdev->dev.parent); |
| 694 | device_unregister(&sch->dev); |
| 695 | /* Reset intparm to zeroes. */ |
| 696 | sch->schib.pmcw.intparm = 0; |
| 697 | cio_modify(sch); |
| 698 | put_device(&cdev->dev); |
| 699 | put_device(&sch->dev); |
| 700 | } |
| 701 | |
| 702 | /* |
| 703 | * subchannel recognition done. Called from the state machine. |
| 704 | */ |
| 705 | void |
| 706 | io_subchannel_recog_done(struct ccw_device *cdev) |
| 707 | { |
| 708 | struct subchannel *sch; |
| 709 | |
| 710 | if (css_init_done == 0) { |
| 711 | cdev->private->flags.recog_done = 1; |
| 712 | return; |
| 713 | } |
| 714 | switch (cdev->private->state) { |
| 715 | case DEV_STATE_NOT_OPER: |
| 716 | cdev->private->flags.recog_done = 1; |
| 717 | /* Remove device found not operational. */ |
| 718 | if (!get_device(&cdev->dev)) |
| 719 | break; |
| 720 | sch = to_subchannel(cdev->dev.parent); |
| 721 | PREPARE_WORK(&cdev->private->kick_work, |
| 722 | ccw_device_call_sch_unregister, (void *) cdev); |
| 723 | queue_work(slow_path_wq, &cdev->private->kick_work); |
| 724 | if (atomic_dec_and_test(&ccw_device_init_count)) |
| 725 | wake_up(&ccw_device_init_wq); |
| 726 | break; |
| 727 | case DEV_STATE_BOXED: |
| 728 | /* Device did not respond in time. */ |
| 729 | case DEV_STATE_OFFLINE: |
| 730 | /* |
| 731 | * We can't register the device in interrupt context so |
| 732 | * we schedule a work item. |
| 733 | */ |
| 734 | if (!get_device(&cdev->dev)) |
| 735 | break; |
| 736 | PREPARE_WORK(&cdev->private->kick_work, |
| 737 | io_subchannel_register, (void *) cdev); |
| 738 | queue_work(slow_path_wq, &cdev->private->kick_work); |
| 739 | break; |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | static int |
| 744 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
| 745 | { |
| 746 | int rc; |
| 747 | struct ccw_device_private *priv; |
| 748 | |
| 749 | sch->dev.driver_data = cdev; |
| 750 | sch->driver = &io_subchannel_driver; |
| 751 | cdev->ccwlock = &sch->lock; |
| 752 | /* Init private data. */ |
| 753 | priv = cdev->private; |
| 754 | priv->devno = sch->schib.pmcw.dev; |
| 755 | priv->irq = sch->irq; |
| 756 | priv->state = DEV_STATE_NOT_OPER; |
| 757 | INIT_LIST_HEAD(&priv->cmb_list); |
| 758 | init_waitqueue_head(&priv->wait_q); |
| 759 | init_timer(&priv->timer); |
| 760 | |
| 761 | /* Set an initial name for the device. */ |
| 762 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", |
| 763 | sch->schib.pmcw.dev); |
| 764 | |
| 765 | /* Increase counter of devices currently in recognition. */ |
| 766 | atomic_inc(&ccw_device_init_count); |
| 767 | |
| 768 | /* Start async. device sensing. */ |
| 769 | spin_lock_irq(&sch->lock); |
| 770 | rc = ccw_device_recognition(cdev); |
| 771 | spin_unlock_irq(&sch->lock); |
| 772 | if (rc) { |
| 773 | if (atomic_dec_and_test(&ccw_device_init_count)) |
| 774 | wake_up(&ccw_device_init_wq); |
| 775 | } |
| 776 | return rc; |
| 777 | } |
| 778 | |
| 779 | static int |
| 780 | io_subchannel_probe (struct device *pdev) |
| 781 | { |
| 782 | struct subchannel *sch; |
| 783 | struct ccw_device *cdev; |
| 784 | int rc; |
| 785 | unsigned long flags; |
| 786 | |
| 787 | sch = to_subchannel(pdev); |
| 788 | if (sch->dev.driver_data) { |
| 789 | /* |
| 790 | * This subchannel already has an associated ccw_device. |
| 791 | * Register it and exit. This happens for all early |
| 792 | * device, e.g. the console. |
| 793 | */ |
| 794 | cdev = sch->dev.driver_data; |
| 795 | device_initialize(&cdev->dev); |
| 796 | ccw_device_register(cdev); |
| 797 | subchannel_add_files(&sch->dev); |
| 798 | /* |
| 799 | * Check if the device is already online. If it is |
| 800 | * the reference count needs to be corrected |
| 801 | * (see ccw_device_online and css_init_done for the |
| 802 | * ugly details). |
| 803 | */ |
| 804 | if (cdev->private->state != DEV_STATE_NOT_OPER && |
| 805 | cdev->private->state != DEV_STATE_OFFLINE && |
| 806 | cdev->private->state != DEV_STATE_BOXED) |
| 807 | get_device(&cdev->dev); |
| 808 | return 0; |
| 809 | } |
| 810 | cdev = kmalloc (sizeof(*cdev), GFP_KERNEL); |
| 811 | if (!cdev) |
| 812 | return -ENOMEM; |
| 813 | memset(cdev, 0, sizeof(struct ccw_device)); |
| 814 | cdev->private = kmalloc(sizeof(struct ccw_device_private), |
| 815 | GFP_KERNEL | GFP_DMA); |
| 816 | if (!cdev->private) { |
| 817 | kfree(cdev); |
| 818 | return -ENOMEM; |
| 819 | } |
| 820 | memset(cdev->private, 0, sizeof(struct ccw_device_private)); |
| 821 | atomic_set(&cdev->private->onoff, 0); |
| 822 | cdev->dev = (struct device) { |
| 823 | .parent = pdev, |
| 824 | .release = ccw_device_release, |
| 825 | }; |
| 826 | INIT_LIST_HEAD(&cdev->private->kick_work.entry); |
| 827 | /* Do first half of device_register. */ |
| 828 | device_initialize(&cdev->dev); |
| 829 | |
| 830 | if (!get_device(&sch->dev)) { |
| 831 | if (cdev->dev.release) |
| 832 | cdev->dev.release(&cdev->dev); |
| 833 | return -ENODEV; |
| 834 | } |
| 835 | |
| 836 | rc = io_subchannel_recog(cdev, to_subchannel(pdev)); |
| 837 | if (rc) { |
| 838 | spin_lock_irqsave(&sch->lock, flags); |
| 839 | sch->dev.driver_data = NULL; |
| 840 | spin_unlock_irqrestore(&sch->lock, flags); |
| 841 | if (cdev->dev.release) |
| 842 | cdev->dev.release(&cdev->dev); |
| 843 | } |
| 844 | |
| 845 | return rc; |
| 846 | } |
| 847 | |
| 848 | static void |
| 849 | ccw_device_unregister(void *data) |
| 850 | { |
| 851 | struct ccw_device *cdev; |
| 852 | |
| 853 | cdev = (struct ccw_device *)data; |
| 854 | if (test_and_clear_bit(1, &cdev->private->registered)) |
| 855 | device_unregister(&cdev->dev); |
| 856 | put_device(&cdev->dev); |
| 857 | } |
| 858 | |
| 859 | static int |
| 860 | io_subchannel_remove (struct device *dev) |
| 861 | { |
| 862 | struct ccw_device *cdev; |
| 863 | unsigned long flags; |
| 864 | |
| 865 | if (!dev->driver_data) |
| 866 | return 0; |
| 867 | cdev = dev->driver_data; |
| 868 | /* Set ccw device to not operational and drop reference. */ |
| 869 | spin_lock_irqsave(cdev->ccwlock, flags); |
| 870 | dev->driver_data = NULL; |
| 871 | cdev->private->state = DEV_STATE_NOT_OPER; |
| 872 | spin_unlock_irqrestore(cdev->ccwlock, flags); |
| 873 | /* |
| 874 | * Put unregistration on workqueue to avoid livelocks on the css bus |
| 875 | * semaphore. |
| 876 | */ |
| 877 | if (get_device(&cdev->dev)) { |
| 878 | PREPARE_WORK(&cdev->private->kick_work, |
| 879 | ccw_device_unregister, (void *) cdev); |
| 880 | queue_work(ccw_device_work, &cdev->private->kick_work); |
| 881 | } |
| 882 | return 0; |
| 883 | } |
| 884 | |
| 885 | static int |
| 886 | io_subchannel_notify(struct device *dev, int event) |
| 887 | { |
| 888 | struct ccw_device *cdev; |
| 889 | |
| 890 | cdev = dev->driver_data; |
| 891 | if (!cdev) |
| 892 | return 0; |
| 893 | if (!cdev->drv) |
| 894 | return 0; |
| 895 | if (!cdev->online) |
| 896 | return 0; |
| 897 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; |
| 898 | } |
| 899 | |
| 900 | static void |
| 901 | io_subchannel_verify(struct device *dev) |
| 902 | { |
| 903 | struct ccw_device *cdev; |
| 904 | |
| 905 | cdev = dev->driver_data; |
| 906 | if (cdev) |
| 907 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); |
| 908 | } |
| 909 | |
| 910 | static void |
| 911 | io_subchannel_ioterm(struct device *dev) |
| 912 | { |
| 913 | struct ccw_device *cdev; |
| 914 | |
| 915 | cdev = dev->driver_data; |
| 916 | if (!cdev) |
| 917 | return; |
| 918 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
| 919 | if (cdev->handler) |
| 920 | cdev->handler(cdev, cdev->private->intparm, |
| 921 | ERR_PTR(-EIO)); |
| 922 | } |
| 923 | |
| 924 | static void |
| 925 | io_subchannel_shutdown(struct device *dev) |
| 926 | { |
| 927 | struct subchannel *sch; |
| 928 | struct ccw_device *cdev; |
| 929 | int ret; |
| 930 | |
| 931 | sch = to_subchannel(dev); |
| 932 | cdev = dev->driver_data; |
| 933 | |
| 934 | if (cio_is_console(sch->irq)) |
| 935 | return; |
| 936 | if (!sch->schib.pmcw.ena) |
| 937 | /* Nothing to do. */ |
| 938 | return; |
| 939 | ret = cio_disable_subchannel(sch); |
| 940 | if (ret != -EBUSY) |
| 941 | /* Subchannel is disabled, we're done. */ |
| 942 | return; |
| 943 | cdev->private->state = DEV_STATE_QUIESCE; |
| 944 | if (cdev->handler) |
| 945 | cdev->handler(cdev, cdev->private->intparm, |
| 946 | ERR_PTR(-EIO)); |
| 947 | ret = ccw_device_cancel_halt_clear(cdev); |
| 948 | if (ret == -EBUSY) { |
| 949 | ccw_device_set_timeout(cdev, HZ/10); |
| 950 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
| 951 | } |
| 952 | cio_disable_subchannel(sch); |
| 953 | } |
| 954 | |
| 955 | #ifdef CONFIG_CCW_CONSOLE |
| 956 | static struct ccw_device console_cdev; |
| 957 | static struct ccw_device_private console_private; |
| 958 | static int console_cdev_in_use; |
| 959 | |
| 960 | static int |
| 961 | ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch) |
| 962 | { |
| 963 | int rc; |
| 964 | |
| 965 | /* Initialize the ccw_device structure. */ |
| 966 | cdev->dev = (struct device) { |
| 967 | .parent = &sch->dev, |
| 968 | }; |
| 969 | /* Initialize the subchannel structure */ |
| 970 | sch->dev.parent = &css_bus_device; |
| 971 | sch->dev.bus = &css_bus_type; |
| 972 | |
| 973 | rc = io_subchannel_recog(cdev, sch); |
| 974 | if (rc) |
| 975 | return rc; |
| 976 | |
| 977 | /* Now wait for the async. recognition to come to an end. */ |
| 978 | spin_lock_irq(cdev->ccwlock); |
| 979 | while (!dev_fsm_final_state(cdev)) |
| 980 | wait_cons_dev(); |
| 981 | rc = -EIO; |
| 982 | if (cdev->private->state != DEV_STATE_OFFLINE) |
| 983 | goto out_unlock; |
| 984 | ccw_device_online(cdev); |
| 985 | while (!dev_fsm_final_state(cdev)) |
| 986 | wait_cons_dev(); |
| 987 | if (cdev->private->state != DEV_STATE_ONLINE) |
| 988 | goto out_unlock; |
| 989 | rc = 0; |
| 990 | out_unlock: |
| 991 | spin_unlock_irq(cdev->ccwlock); |
| 992 | return 0; |
| 993 | } |
| 994 | |
| 995 | struct ccw_device * |
| 996 | ccw_device_probe_console(void) |
| 997 | { |
| 998 | struct subchannel *sch; |
| 999 | int ret; |
| 1000 | |
| 1001 | if (xchg(&console_cdev_in_use, 1) != 0) |
| 1002 | return NULL; |
| 1003 | sch = cio_probe_console(); |
| 1004 | if (IS_ERR(sch)) { |
| 1005 | console_cdev_in_use = 0; |
| 1006 | return (void *) sch; |
| 1007 | } |
| 1008 | memset(&console_cdev, 0, sizeof(struct ccw_device)); |
| 1009 | memset(&console_private, 0, sizeof(struct ccw_device_private)); |
| 1010 | console_cdev.private = &console_private; |
| 1011 | ret = ccw_device_console_enable(&console_cdev, sch); |
| 1012 | if (ret) { |
| 1013 | cio_release_console(); |
| 1014 | console_cdev_in_use = 0; |
| 1015 | return ERR_PTR(ret); |
| 1016 | } |
| 1017 | console_cdev.online = 1; |
| 1018 | return &console_cdev; |
| 1019 | } |
| 1020 | #endif |
| 1021 | |
| 1022 | /* |
| 1023 | * get ccw_device matching the busid, but only if owned by cdrv |
| 1024 | */ |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 1025 | static int |
| 1026 | __ccwdev_check_busid(struct device *dev, void *id) |
| 1027 | { |
| 1028 | char *bus_id; |
| 1029 | |
| 1030 | bus_id = (char *)id; |
| 1031 | |
| 1032 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); |
| 1033 | } |
| 1034 | |
| 1035 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | struct ccw_device * |
| 1037 | get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id) |
| 1038 | { |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 1039 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | struct device_driver *drv; |
| 1041 | |
| 1042 | drv = get_driver(&cdrv->driver); |
| 1043 | if (!drv) |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 1044 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 1046 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
| 1047 | __ccwdev_check_busid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | put_driver(drv); |
| 1049 | |
| 1050 | return dev ? to_ccwdev(dev) : 0; |
| 1051 | } |
| 1052 | |
| 1053 | /************************** device driver handling ************************/ |
| 1054 | |
| 1055 | /* This is the implementation of the ccw_driver class. The probe, remove |
| 1056 | * and release methods are initially very similar to the device_driver |
| 1057 | * implementations, with the difference that they have ccw_device |
| 1058 | * arguments. |
| 1059 | * |
| 1060 | * A ccw driver also contains the information that is needed for |
| 1061 | * device matching. |
| 1062 | */ |
| 1063 | static int |
| 1064 | ccw_device_probe (struct device *dev) |
| 1065 | { |
| 1066 | struct ccw_device *cdev = to_ccwdev(dev); |
| 1067 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); |
| 1068 | int ret; |
| 1069 | |
| 1070 | cdev->drv = cdrv; /* to let the driver call _set_online */ |
| 1071 | |
| 1072 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; |
| 1073 | |
| 1074 | if (ret) { |
| 1075 | cdev->drv = 0; |
| 1076 | return ret; |
| 1077 | } |
| 1078 | |
| 1079 | return 0; |
| 1080 | } |
| 1081 | |
| 1082 | static int |
| 1083 | ccw_device_remove (struct device *dev) |
| 1084 | { |
| 1085 | struct ccw_device *cdev = to_ccwdev(dev); |
| 1086 | struct ccw_driver *cdrv = cdev->drv; |
| 1087 | int ret; |
| 1088 | |
| 1089 | pr_debug("removing device %s\n", cdev->dev.bus_id); |
| 1090 | if (cdrv->remove) |
| 1091 | cdrv->remove(cdev); |
| 1092 | if (cdev->online) { |
| 1093 | cdev->online = 0; |
| 1094 | spin_lock_irq(cdev->ccwlock); |
| 1095 | ret = ccw_device_offline(cdev); |
| 1096 | spin_unlock_irq(cdev->ccwlock); |
| 1097 | if (ret == 0) |
| 1098 | wait_event(cdev->private->wait_q, |
| 1099 | dev_fsm_final_state(cdev)); |
| 1100 | else |
| 1101 | //FIXME: we can't fail! |
| 1102 | pr_debug("ccw_device_offline returned %d, device %s\n", |
| 1103 | ret, cdev->dev.bus_id); |
| 1104 | } |
| 1105 | ccw_device_set_timeout(cdev, 0); |
| 1106 | cdev->drv = 0; |
| 1107 | return 0; |
| 1108 | } |
| 1109 | |
| 1110 | int |
| 1111 | ccw_driver_register (struct ccw_driver *cdriver) |
| 1112 | { |
| 1113 | struct device_driver *drv = &cdriver->driver; |
| 1114 | |
| 1115 | drv->bus = &ccw_bus_type; |
| 1116 | drv->name = cdriver->name; |
| 1117 | drv->probe = ccw_device_probe; |
| 1118 | drv->remove = ccw_device_remove; |
| 1119 | |
| 1120 | return driver_register(drv); |
| 1121 | } |
| 1122 | |
| 1123 | void |
| 1124 | ccw_driver_unregister (struct ccw_driver *cdriver) |
| 1125 | { |
| 1126 | driver_unregister(&cdriver->driver); |
| 1127 | } |
| 1128 | |
| 1129 | MODULE_LICENSE("GPL"); |
| 1130 | EXPORT_SYMBOL(ccw_device_set_online); |
| 1131 | EXPORT_SYMBOL(ccw_device_set_offline); |
| 1132 | EXPORT_SYMBOL(ccw_driver_register); |
| 1133 | EXPORT_SYMBOL(ccw_driver_unregister); |
| 1134 | EXPORT_SYMBOL(get_ccwdev_by_busid); |
| 1135 | EXPORT_SYMBOL(ccw_bus_type); |
| 1136 | EXPORT_SYMBOL(ccw_device_work); |
| 1137 | EXPORT_SYMBOL(ccw_device_notify_work); |