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> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 25 | #include <asm/param.h> /* HZ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | #include "cio.h" |
| 28 | #include "css.h" |
| 29 | #include "device.h" |
| 30 | #include "ioasm.h" |
| 31 | |
| 32 | /******************* bus type handling ***********************/ |
| 33 | |
| 34 | /* The Linux driver model distinguishes between a bus type and |
| 35 | * the bus itself. Of course we only have one channel |
| 36 | * subsystem driver and one channel system per machine, but |
| 37 | * we still use the abstraction. T.R. says it's a good idea. */ |
| 38 | static int |
| 39 | ccw_bus_match (struct device * dev, struct device_driver * drv) |
| 40 | { |
| 41 | struct ccw_device *cdev = to_ccwdev(dev); |
| 42 | struct ccw_driver *cdrv = to_ccwdrv(drv); |
| 43 | const struct ccw_device_id *ids = cdrv->ids, *found; |
| 44 | |
| 45 | if (!ids) |
| 46 | return 0; |
| 47 | |
| 48 | found = ccw_device_id_match(ids, &cdev->id); |
| 49 | if (!found) |
| 50 | return 0; |
| 51 | |
| 52 | cdev->id.driver_info = found->driver_info; |
| 53 | |
| 54 | return 1; |
| 55 | } |
| 56 | |
| 57 | /* |
| 58 | * Hotplugging interface for ccw devices. |
| 59 | * Heavily modeled on pci and usb hotplug. |
| 60 | */ |
| 61 | static int |
Paul Jackson | 6d20b03 | 2005-11-25 20:04:26 -0800 | [diff] [blame^] | 62 | ccw_uevent (struct device *dev, char **envp, int num_envp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | char *buffer, int buffer_size) |
| 64 | { |
| 65 | struct ccw_device *cdev = to_ccwdev(dev); |
| 66 | int i = 0; |
| 67 | int length = 0; |
| 68 | |
| 69 | if (!cdev) |
| 70 | return -ENODEV; |
| 71 | |
| 72 | /* what we want to pass to /sbin/hotplug */ |
| 73 | |
| 74 | envp[i++] = buffer; |
| 75 | length += scnprintf(buffer, buffer_size - length, "CU_TYPE=%04X", |
| 76 | cdev->id.cu_type); |
| 77 | if ((buffer_size - length <= 0) || (i >= num_envp)) |
| 78 | return -ENOMEM; |
| 79 | ++length; |
| 80 | buffer += length; |
| 81 | |
| 82 | envp[i++] = buffer; |
| 83 | length += scnprintf(buffer, buffer_size - length, "CU_MODEL=%02X", |
| 84 | cdev->id.cu_model); |
| 85 | if ((buffer_size - length <= 0) || (i >= num_envp)) |
| 86 | return -ENOMEM; |
| 87 | ++length; |
| 88 | buffer += length; |
| 89 | |
| 90 | /* The next two can be zero, that's ok for us */ |
| 91 | envp[i++] = buffer; |
| 92 | length += scnprintf(buffer, buffer_size - length, "DEV_TYPE=%04X", |
| 93 | cdev->id.dev_type); |
| 94 | if ((buffer_size - length <= 0) || (i >= num_envp)) |
| 95 | return -ENOMEM; |
| 96 | ++length; |
| 97 | buffer += length; |
| 98 | |
| 99 | envp[i++] = buffer; |
| 100 | length += scnprintf(buffer, buffer_size - length, "DEV_MODEL=%02X", |
| 101 | cdev->id.dev_model); |
| 102 | if ((buffer_size - length <= 0) || (i >= num_envp)) |
| 103 | return -ENOMEM; |
| 104 | |
| 105 | envp[i] = 0; |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | struct bus_type ccw_bus_type = { |
| 111 | .name = "ccw", |
| 112 | .match = &ccw_bus_match, |
Paul Jackson | 6d20b03 | 2005-11-25 20:04:26 -0800 | [diff] [blame^] | 113 | .uevent = &ccw_uevent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | }; |
| 115 | |
| 116 | static int io_subchannel_probe (struct device *); |
| 117 | static int io_subchannel_remove (struct device *); |
| 118 | void io_subchannel_irq (struct device *); |
| 119 | static int io_subchannel_notify(struct device *, int); |
| 120 | static void io_subchannel_verify(struct device *); |
| 121 | static void io_subchannel_ioterm(struct device *); |
| 122 | static void io_subchannel_shutdown(struct device *); |
| 123 | |
| 124 | struct css_driver io_subchannel_driver = { |
| 125 | .subchannel_type = SUBCHANNEL_TYPE_IO, |
| 126 | .drv = { |
| 127 | .name = "io_subchannel", |
| 128 | .bus = &css_bus_type, |
| 129 | .probe = &io_subchannel_probe, |
| 130 | .remove = &io_subchannel_remove, |
| 131 | .shutdown = &io_subchannel_shutdown, |
| 132 | }, |
| 133 | .irq = io_subchannel_irq, |
| 134 | .notify = io_subchannel_notify, |
| 135 | .verify = io_subchannel_verify, |
| 136 | .termination = io_subchannel_ioterm, |
| 137 | }; |
| 138 | |
| 139 | struct workqueue_struct *ccw_device_work; |
| 140 | struct workqueue_struct *ccw_device_notify_work; |
| 141 | static wait_queue_head_t ccw_device_init_wq; |
| 142 | static atomic_t ccw_device_init_count; |
| 143 | |
| 144 | static int __init |
| 145 | init_ccw_bus_type (void) |
| 146 | { |
| 147 | int ret; |
| 148 | |
| 149 | init_waitqueue_head(&ccw_device_init_wq); |
| 150 | atomic_set(&ccw_device_init_count, 0); |
| 151 | |
| 152 | ccw_device_work = create_singlethread_workqueue("cio"); |
| 153 | if (!ccw_device_work) |
| 154 | return -ENOMEM; /* FIXME: better errno ? */ |
| 155 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); |
| 156 | if (!ccw_device_notify_work) { |
| 157 | ret = -ENOMEM; /* FIXME: better errno ? */ |
| 158 | goto out_err; |
| 159 | } |
| 160 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); |
| 161 | if (!slow_path_wq) { |
| 162 | ret = -ENOMEM; /* FIXME: better errno ? */ |
| 163 | goto out_err; |
| 164 | } |
| 165 | if ((ret = bus_register (&ccw_bus_type))) |
| 166 | goto out_err; |
| 167 | |
| 168 | if ((ret = driver_register(&io_subchannel_driver.drv))) |
| 169 | goto out_err; |
| 170 | |
| 171 | wait_event(ccw_device_init_wq, |
| 172 | atomic_read(&ccw_device_init_count) == 0); |
| 173 | flush_workqueue(ccw_device_work); |
| 174 | return 0; |
| 175 | out_err: |
| 176 | if (ccw_device_work) |
| 177 | destroy_workqueue(ccw_device_work); |
| 178 | if (ccw_device_notify_work) |
| 179 | destroy_workqueue(ccw_device_notify_work); |
| 180 | if (slow_path_wq) |
| 181 | destroy_workqueue(slow_path_wq); |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | static void __exit |
| 186 | cleanup_ccw_bus_type (void) |
| 187 | { |
| 188 | driver_unregister(&io_subchannel_driver.drv); |
| 189 | bus_unregister(&ccw_bus_type); |
| 190 | destroy_workqueue(ccw_device_notify_work); |
| 191 | destroy_workqueue(ccw_device_work); |
| 192 | } |
| 193 | |
| 194 | subsys_initcall(init_ccw_bus_type); |
| 195 | module_exit(cleanup_ccw_bus_type); |
| 196 | |
| 197 | /************************ device handling **************************/ |
| 198 | |
| 199 | /* |
| 200 | * A ccw_device has some interfaces in sysfs in addition to the |
| 201 | * standard ones. |
| 202 | * The following entries are designed to export the information which |
| 203 | * resided in 2.4 in /proc/subchannels. Subchannel and device number |
| 204 | * are obvious, so they don't have an entry :) |
| 205 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? |
| 206 | */ |
| 207 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 208 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | { |
| 210 | struct subchannel *sch = to_subchannel(dev); |
| 211 | struct ssd_info *ssd = &sch->ssd_info; |
| 212 | ssize_t ret = 0; |
| 213 | int chp; |
| 214 | |
| 215 | for (chp = 0; chp < 8; chp++) |
| 216 | ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]); |
| 217 | |
| 218 | ret += sprintf (buf+ret, "\n"); |
| 219 | return min((ssize_t)PAGE_SIZE, ret); |
| 220 | } |
| 221 | |
| 222 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 223 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | { |
| 225 | struct subchannel *sch = to_subchannel(dev); |
| 226 | struct pmcw *pmcw = &sch->schib.pmcw; |
| 227 | |
| 228 | return sprintf (buf, "%02x %02x %02x\n", |
| 229 | pmcw->pim, pmcw->pam, pmcw->pom); |
| 230 | } |
| 231 | |
| 232 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 233 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | { |
| 235 | struct ccw_device *cdev = to_ccwdev(dev); |
| 236 | struct ccw_device_id *id = &(cdev->id); |
| 237 | |
| 238 | if (id->dev_type != 0) |
| 239 | return sprintf(buf, "%04x/%02x\n", |
| 240 | id->dev_type, id->dev_model); |
| 241 | else |
| 242 | return sprintf(buf, "n/a\n"); |
| 243 | } |
| 244 | |
| 245 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 246 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | { |
| 248 | struct ccw_device *cdev = to_ccwdev(dev); |
| 249 | struct ccw_device_id *id = &(cdev->id); |
| 250 | |
| 251 | return sprintf(buf, "%04x/%02x\n", |
| 252 | id->cu_type, id->cu_model); |
| 253 | } |
| 254 | |
| 255 | static ssize_t |
Bastian Blank | f1fc78a | 2005-10-30 15:00:12 -0800 | [diff] [blame] | 256 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) |
| 257 | { |
| 258 | struct ccw_device *cdev = to_ccwdev(dev); |
| 259 | struct ccw_device_id *id = &(cdev->id); |
| 260 | int ret; |
| 261 | |
| 262 | ret = sprintf(buf, "ccw:t%04Xm%02x", |
| 263 | id->cu_type, id->cu_model); |
| 264 | if (id->dev_type != 0) |
| 265 | ret += sprintf(buf + ret, "dt%04Xdm%02X\n", |
| 266 | id->dev_type, id->dev_model); |
| 267 | else |
| 268 | ret += sprintf(buf + ret, "dtdm\n"); |
| 269 | return ret; |
| 270 | } |
| 271 | |
| 272 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 273 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | { |
| 275 | struct ccw_device *cdev = to_ccwdev(dev); |
| 276 | |
| 277 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); |
| 278 | } |
| 279 | |
| 280 | static void |
| 281 | ccw_device_remove_disconnected(struct ccw_device *cdev) |
| 282 | { |
| 283 | struct subchannel *sch; |
| 284 | /* |
| 285 | * Forced offline in disconnected state means |
| 286 | * 'throw away device'. |
| 287 | */ |
| 288 | sch = to_subchannel(cdev->dev.parent); |
| 289 | device_unregister(&sch->dev); |
| 290 | /* Reset intparm to zeroes. */ |
| 291 | sch->schib.pmcw.intparm = 0; |
| 292 | cio_modify(sch); |
| 293 | put_device(&sch->dev); |
| 294 | } |
| 295 | |
| 296 | int |
| 297 | ccw_device_set_offline(struct ccw_device *cdev) |
| 298 | { |
| 299 | int ret; |
| 300 | |
| 301 | if (!cdev) |
| 302 | return -ENODEV; |
| 303 | if (!cdev->online || !cdev->drv) |
| 304 | return -EINVAL; |
| 305 | |
| 306 | if (cdev->drv->set_offline) { |
| 307 | ret = cdev->drv->set_offline(cdev); |
| 308 | if (ret != 0) |
| 309 | return ret; |
| 310 | } |
| 311 | cdev->online = 0; |
| 312 | spin_lock_irq(cdev->ccwlock); |
| 313 | ret = ccw_device_offline(cdev); |
| 314 | if (ret == -ENODEV) { |
| 315 | if (cdev->private->state != DEV_STATE_NOT_OPER) { |
| 316 | cdev->private->state = DEV_STATE_OFFLINE; |
| 317 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
| 318 | } |
| 319 | spin_unlock_irq(cdev->ccwlock); |
| 320 | return ret; |
| 321 | } |
| 322 | spin_unlock_irq(cdev->ccwlock); |
| 323 | if (ret == 0) |
| 324 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
| 325 | else { |
| 326 | pr_debug("ccw_device_offline returned %d, device %s\n", |
| 327 | ret, cdev->dev.bus_id); |
| 328 | cdev->online = 1; |
| 329 | } |
| 330 | return ret; |
| 331 | } |
| 332 | |
| 333 | int |
| 334 | ccw_device_set_online(struct ccw_device *cdev) |
| 335 | { |
| 336 | int ret; |
| 337 | |
| 338 | if (!cdev) |
| 339 | return -ENODEV; |
| 340 | if (cdev->online || !cdev->drv) |
| 341 | return -EINVAL; |
| 342 | |
| 343 | spin_lock_irq(cdev->ccwlock); |
| 344 | ret = ccw_device_online(cdev); |
| 345 | spin_unlock_irq(cdev->ccwlock); |
| 346 | if (ret == 0) |
| 347 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
| 348 | else { |
| 349 | pr_debug("ccw_device_online returned %d, device %s\n", |
| 350 | ret, cdev->dev.bus_id); |
| 351 | return ret; |
| 352 | } |
| 353 | if (cdev->private->state != DEV_STATE_ONLINE) |
| 354 | return -ENODEV; |
| 355 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { |
| 356 | cdev->online = 1; |
| 357 | return 0; |
| 358 | } |
| 359 | spin_lock_irq(cdev->ccwlock); |
| 360 | ret = ccw_device_offline(cdev); |
| 361 | spin_unlock_irq(cdev->ccwlock); |
| 362 | if (ret == 0) |
| 363 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
| 364 | else |
| 365 | pr_debug("ccw_device_offline returned %d, device %s\n", |
| 366 | ret, cdev->dev.bus_id); |
| 367 | return (ret = 0) ? -ENODEV : ret; |
| 368 | } |
| 369 | |
| 370 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 371 | 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] | 372 | { |
| 373 | struct ccw_device *cdev = to_ccwdev(dev); |
| 374 | int i, force, ret; |
| 375 | char *tmp; |
| 376 | |
| 377 | if (atomic_compare_and_swap(0, 1, &cdev->private->onoff)) |
| 378 | return -EAGAIN; |
| 379 | |
| 380 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { |
| 381 | atomic_set(&cdev->private->onoff, 0); |
| 382 | return -EINVAL; |
| 383 | } |
| 384 | if (!strncmp(buf, "force\n", count)) { |
| 385 | force = 1; |
| 386 | i = 1; |
| 387 | } else { |
| 388 | force = 0; |
| 389 | i = simple_strtoul(buf, &tmp, 16); |
| 390 | } |
| 391 | if (i == 1) { |
| 392 | /* Do device recognition, if needed. */ |
| 393 | if (cdev->id.cu_type == 0) { |
| 394 | ret = ccw_device_recognition(cdev); |
| 395 | if (ret) { |
| 396 | printk(KERN_WARNING"Couldn't start recognition " |
| 397 | "for device %s (ret=%d)\n", |
| 398 | cdev->dev.bus_id, ret); |
| 399 | goto out; |
| 400 | } |
| 401 | wait_event(cdev->private->wait_q, |
| 402 | cdev->private->flags.recog_done); |
| 403 | } |
| 404 | if (cdev->drv && cdev->drv->set_online) |
| 405 | ccw_device_set_online(cdev); |
| 406 | } else if (i == 0) { |
| 407 | if (cdev->private->state == DEV_STATE_DISCONNECTED) |
| 408 | ccw_device_remove_disconnected(cdev); |
| 409 | else if (cdev->drv && cdev->drv->set_offline) |
| 410 | ccw_device_set_offline(cdev); |
| 411 | } |
| 412 | if (force && cdev->private->state == DEV_STATE_BOXED) { |
| 413 | ret = ccw_device_stlck(cdev); |
| 414 | if (ret) { |
| 415 | printk(KERN_WARNING"ccw_device_stlck for device %s " |
| 416 | "returned %d!\n", cdev->dev.bus_id, ret); |
| 417 | goto out; |
| 418 | } |
| 419 | /* Do device recognition, if needed. */ |
| 420 | if (cdev->id.cu_type == 0) { |
| 421 | cdev->private->state = DEV_STATE_NOT_OPER; |
| 422 | ret = ccw_device_recognition(cdev); |
| 423 | if (ret) { |
| 424 | printk(KERN_WARNING"Couldn't start recognition " |
| 425 | "for device %s (ret=%d)\n", |
| 426 | cdev->dev.bus_id, ret); |
| 427 | goto out; |
| 428 | } |
| 429 | wait_event(cdev->private->wait_q, |
| 430 | cdev->private->flags.recog_done); |
| 431 | } |
| 432 | if (cdev->drv && cdev->drv->set_online) |
| 433 | ccw_device_set_online(cdev); |
| 434 | } |
| 435 | out: |
| 436 | if (cdev->drv) |
| 437 | module_put(cdev->drv->owner); |
| 438 | atomic_set(&cdev->private->onoff, 0); |
| 439 | return count; |
| 440 | } |
| 441 | |
| 442 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 443 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | { |
| 445 | struct ccw_device *cdev = to_ccwdev(dev); |
| 446 | struct subchannel *sch; |
| 447 | |
| 448 | switch (cdev->private->state) { |
| 449 | case DEV_STATE_BOXED: |
| 450 | return sprintf(buf, "boxed\n"); |
| 451 | case DEV_STATE_DISCONNECTED: |
| 452 | case DEV_STATE_DISCONNECTED_SENSE_ID: |
| 453 | case DEV_STATE_NOT_OPER: |
| 454 | sch = to_subchannel(dev->parent); |
| 455 | if (!sch->lpm) |
| 456 | return sprintf(buf, "no path\n"); |
| 457 | else |
| 458 | return sprintf(buf, "no device\n"); |
| 459 | default: |
| 460 | /* All other states considered fine. */ |
| 461 | return sprintf(buf, "good\n"); |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); |
| 466 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); |
| 467 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); |
| 468 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); |
Bastian Blank | f1fc78a | 2005-10-30 15:00:12 -0800 | [diff] [blame] | 469 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
| 471 | extern struct device_attribute dev_attr_cmb_enable; |
| 472 | static DEVICE_ATTR(availability, 0444, available_show, NULL); |
| 473 | |
| 474 | static struct attribute * subch_attrs[] = { |
| 475 | &dev_attr_chpids.attr, |
| 476 | &dev_attr_pimpampom.attr, |
| 477 | NULL, |
| 478 | }; |
| 479 | |
| 480 | static struct attribute_group subch_attr_group = { |
| 481 | .attrs = subch_attrs, |
| 482 | }; |
| 483 | |
| 484 | static inline int |
| 485 | subchannel_add_files (struct device *dev) |
| 486 | { |
| 487 | return sysfs_create_group(&dev->kobj, &subch_attr_group); |
| 488 | } |
| 489 | |
| 490 | static struct attribute * ccwdev_attrs[] = { |
| 491 | &dev_attr_devtype.attr, |
| 492 | &dev_attr_cutype.attr, |
Bastian Blank | f1fc78a | 2005-10-30 15:00:12 -0800 | [diff] [blame] | 493 | &dev_attr_modalias.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | &dev_attr_online.attr, |
| 495 | &dev_attr_cmb_enable.attr, |
| 496 | &dev_attr_availability.attr, |
| 497 | NULL, |
| 498 | }; |
| 499 | |
| 500 | static struct attribute_group ccwdev_attr_group = { |
| 501 | .attrs = ccwdev_attrs, |
| 502 | }; |
| 503 | |
| 504 | static inline int |
| 505 | device_add_files (struct device *dev) |
| 506 | { |
| 507 | return sysfs_create_group(&dev->kobj, &ccwdev_attr_group); |
| 508 | } |
| 509 | |
| 510 | static inline void |
| 511 | device_remove_files(struct device *dev) |
| 512 | { |
| 513 | sysfs_remove_group(&dev->kobj, &ccwdev_attr_group); |
| 514 | } |
| 515 | |
| 516 | /* this is a simple abstraction for device_register that sets the |
| 517 | * correct bus type and adds the bus specific files */ |
| 518 | int |
| 519 | ccw_device_register(struct ccw_device *cdev) |
| 520 | { |
| 521 | struct device *dev = &cdev->dev; |
| 522 | int ret; |
| 523 | |
| 524 | dev->bus = &ccw_bus_type; |
| 525 | |
| 526 | if ((ret = device_add(dev))) |
| 527 | return ret; |
| 528 | |
| 529 | set_bit(1, &cdev->private->registered); |
| 530 | if ((ret = device_add_files(dev))) { |
| 531 | if (test_and_clear_bit(1, &cdev->private->registered)) |
| 532 | device_del(dev); |
| 533 | } |
| 534 | return ret; |
| 535 | } |
| 536 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 537 | struct match_data { |
| 538 | unsigned int devno; |
| 539 | struct ccw_device * sibling; |
| 540 | }; |
| 541 | |
| 542 | static int |
| 543 | match_devno(struct device * dev, void * data) |
| 544 | { |
| 545 | struct match_data * d = (struct match_data *)data; |
| 546 | struct ccw_device * cdev; |
| 547 | |
| 548 | cdev = to_ccwdev(dev); |
| 549 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && |
| 550 | (cdev->private->devno == d->devno) && |
| 551 | (cdev != d->sibling)) { |
| 552 | cdev->private->state = DEV_STATE_NOT_OPER; |
| 553 | return 1; |
| 554 | } |
| 555 | return 0; |
| 556 | } |
| 557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | static struct ccw_device * |
| 559 | get_disc_ccwdev_by_devno(unsigned int devno, struct ccw_device *sibling) |
| 560 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | struct device *dev; |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 562 | struct match_data data = { |
| 563 | .devno = devno, |
| 564 | .sibling = sibling, |
| 565 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | |
Cornelia Huck | e5945b4 | 2005-10-11 08:28:59 -0700 | [diff] [blame] | 567 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 569 | return dev ? to_ccwdev(dev) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | } |
| 571 | |
| 572 | static void |
| 573 | ccw_device_add_changed(void *data) |
| 574 | { |
| 575 | |
| 576 | struct ccw_device *cdev; |
| 577 | |
| 578 | cdev = (struct ccw_device *)data; |
| 579 | if (device_add(&cdev->dev)) { |
| 580 | put_device(&cdev->dev); |
| 581 | return; |
| 582 | } |
| 583 | set_bit(1, &cdev->private->registered); |
| 584 | if (device_add_files(&cdev->dev)) { |
| 585 | if (test_and_clear_bit(1, &cdev->private->registered)) |
| 586 | device_unregister(&cdev->dev); |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | extern int css_get_ssd_info(struct subchannel *sch); |
| 591 | |
| 592 | void |
| 593 | ccw_device_do_unreg_rereg(void *data) |
| 594 | { |
| 595 | struct ccw_device *cdev; |
| 596 | struct subchannel *sch; |
| 597 | int need_rename; |
| 598 | |
| 599 | cdev = (struct ccw_device *)data; |
| 600 | sch = to_subchannel(cdev->dev.parent); |
| 601 | if (cdev->private->devno != sch->schib.pmcw.dev) { |
| 602 | /* |
| 603 | * The device number has changed. This is usually only when |
| 604 | * a device has been detached under VM and then re-appeared |
| 605 | * on another subchannel because of a different attachment |
| 606 | * order than before. Ideally, we should should just switch |
| 607 | * subchannels, but unfortunately, this is not possible with |
| 608 | * the current implementation. |
| 609 | * Instead, we search for the old subchannel for this device |
| 610 | * number and deregister so there are no collisions with the |
| 611 | * newly registered ccw_device. |
| 612 | * FIXME: Find another solution so the block layer doesn't |
| 613 | * get possibly sick... |
| 614 | */ |
| 615 | struct ccw_device *other_cdev; |
| 616 | |
| 617 | need_rename = 1; |
| 618 | other_cdev = get_disc_ccwdev_by_devno(sch->schib.pmcw.dev, |
| 619 | cdev); |
| 620 | if (other_cdev) { |
| 621 | struct subchannel *other_sch; |
| 622 | |
| 623 | other_sch = to_subchannel(other_cdev->dev.parent); |
| 624 | if (get_device(&other_sch->dev)) { |
| 625 | stsch(other_sch->irq, &other_sch->schib); |
| 626 | if (other_sch->schib.pmcw.dnv) { |
| 627 | other_sch->schib.pmcw.intparm = 0; |
| 628 | cio_modify(other_sch); |
| 629 | } |
| 630 | device_unregister(&other_sch->dev); |
| 631 | } |
| 632 | } |
| 633 | /* Update ssd info here. */ |
| 634 | css_get_ssd_info(sch); |
| 635 | cdev->private->devno = sch->schib.pmcw.dev; |
| 636 | } else |
| 637 | need_rename = 0; |
| 638 | device_remove_files(&cdev->dev); |
| 639 | if (test_and_clear_bit(1, &cdev->private->registered)) |
| 640 | device_del(&cdev->dev); |
| 641 | if (need_rename) |
| 642 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", |
| 643 | sch->schib.pmcw.dev); |
| 644 | PREPARE_WORK(&cdev->private->kick_work, |
| 645 | ccw_device_add_changed, (void *)cdev); |
| 646 | queue_work(ccw_device_work, &cdev->private->kick_work); |
| 647 | } |
| 648 | |
| 649 | static void |
| 650 | ccw_device_release(struct device *dev) |
| 651 | { |
| 652 | struct ccw_device *cdev; |
| 653 | |
| 654 | cdev = to_ccwdev(dev); |
| 655 | kfree(cdev->private); |
| 656 | kfree(cdev); |
| 657 | } |
| 658 | |
| 659 | /* |
| 660 | * Register recognized device. |
| 661 | */ |
| 662 | static void |
| 663 | io_subchannel_register(void *data) |
| 664 | { |
| 665 | struct ccw_device *cdev; |
| 666 | struct subchannel *sch; |
| 667 | int ret; |
| 668 | unsigned long flags; |
| 669 | |
| 670 | cdev = (struct ccw_device *) data; |
| 671 | sch = to_subchannel(cdev->dev.parent); |
| 672 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 673 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | bus_rescan_devices(&ccw_bus_type); |
| 675 | goto out; |
| 676 | } |
| 677 | /* make it known to the system */ |
| 678 | ret = ccw_device_register(cdev); |
| 679 | if (ret) { |
| 680 | printk (KERN_WARNING "%s: could not register %s\n", |
| 681 | __func__, cdev->dev.bus_id); |
| 682 | put_device(&cdev->dev); |
| 683 | spin_lock_irqsave(&sch->lock, flags); |
| 684 | sch->dev.driver_data = NULL; |
| 685 | spin_unlock_irqrestore(&sch->lock, flags); |
| 686 | kfree (cdev->private); |
| 687 | kfree (cdev); |
| 688 | put_device(&sch->dev); |
| 689 | if (atomic_dec_and_test(&ccw_device_init_count)) |
| 690 | wake_up(&ccw_device_init_wq); |
| 691 | return; |
| 692 | } |
| 693 | |
| 694 | ret = subchannel_add_files(cdev->dev.parent); |
| 695 | if (ret) |
| 696 | printk(KERN_WARNING "%s: could not add attributes to %s\n", |
| 697 | __func__, sch->dev.bus_id); |
| 698 | put_device(&cdev->dev); |
| 699 | out: |
| 700 | cdev->private->flags.recog_done = 1; |
| 701 | put_device(&sch->dev); |
| 702 | wake_up(&cdev->private->wait_q); |
| 703 | if (atomic_dec_and_test(&ccw_device_init_count)) |
| 704 | wake_up(&ccw_device_init_wq); |
| 705 | } |
| 706 | |
| 707 | void |
| 708 | ccw_device_call_sch_unregister(void *data) |
| 709 | { |
| 710 | struct ccw_device *cdev = data; |
| 711 | struct subchannel *sch; |
| 712 | |
| 713 | sch = to_subchannel(cdev->dev.parent); |
| 714 | device_unregister(&sch->dev); |
| 715 | /* Reset intparm to zeroes. */ |
| 716 | sch->schib.pmcw.intparm = 0; |
| 717 | cio_modify(sch); |
| 718 | put_device(&cdev->dev); |
| 719 | put_device(&sch->dev); |
| 720 | } |
| 721 | |
| 722 | /* |
| 723 | * subchannel recognition done. Called from the state machine. |
| 724 | */ |
| 725 | void |
| 726 | io_subchannel_recog_done(struct ccw_device *cdev) |
| 727 | { |
| 728 | struct subchannel *sch; |
| 729 | |
| 730 | if (css_init_done == 0) { |
| 731 | cdev->private->flags.recog_done = 1; |
| 732 | return; |
| 733 | } |
| 734 | switch (cdev->private->state) { |
| 735 | case DEV_STATE_NOT_OPER: |
| 736 | cdev->private->flags.recog_done = 1; |
| 737 | /* Remove device found not operational. */ |
| 738 | if (!get_device(&cdev->dev)) |
| 739 | break; |
| 740 | sch = to_subchannel(cdev->dev.parent); |
| 741 | PREPARE_WORK(&cdev->private->kick_work, |
| 742 | ccw_device_call_sch_unregister, (void *) cdev); |
| 743 | queue_work(slow_path_wq, &cdev->private->kick_work); |
| 744 | if (atomic_dec_and_test(&ccw_device_init_count)) |
| 745 | wake_up(&ccw_device_init_wq); |
| 746 | break; |
| 747 | case DEV_STATE_BOXED: |
| 748 | /* Device did not respond in time. */ |
| 749 | case DEV_STATE_OFFLINE: |
| 750 | /* |
| 751 | * We can't register the device in interrupt context so |
| 752 | * we schedule a work item. |
| 753 | */ |
| 754 | if (!get_device(&cdev->dev)) |
| 755 | break; |
| 756 | PREPARE_WORK(&cdev->private->kick_work, |
| 757 | io_subchannel_register, (void *) cdev); |
| 758 | queue_work(slow_path_wq, &cdev->private->kick_work); |
| 759 | break; |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | static int |
| 764 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) |
| 765 | { |
| 766 | int rc; |
| 767 | struct ccw_device_private *priv; |
| 768 | |
| 769 | sch->dev.driver_data = cdev; |
| 770 | sch->driver = &io_subchannel_driver; |
| 771 | cdev->ccwlock = &sch->lock; |
| 772 | /* Init private data. */ |
| 773 | priv = cdev->private; |
| 774 | priv->devno = sch->schib.pmcw.dev; |
| 775 | priv->irq = sch->irq; |
| 776 | priv->state = DEV_STATE_NOT_OPER; |
| 777 | INIT_LIST_HEAD(&priv->cmb_list); |
| 778 | init_waitqueue_head(&priv->wait_q); |
| 779 | init_timer(&priv->timer); |
| 780 | |
| 781 | /* Set an initial name for the device. */ |
| 782 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", |
| 783 | sch->schib.pmcw.dev); |
| 784 | |
| 785 | /* Increase counter of devices currently in recognition. */ |
| 786 | atomic_inc(&ccw_device_init_count); |
| 787 | |
| 788 | /* Start async. device sensing. */ |
| 789 | spin_lock_irq(&sch->lock); |
| 790 | rc = ccw_device_recognition(cdev); |
| 791 | spin_unlock_irq(&sch->lock); |
| 792 | if (rc) { |
| 793 | if (atomic_dec_and_test(&ccw_device_init_count)) |
| 794 | wake_up(&ccw_device_init_wq); |
| 795 | } |
| 796 | return rc; |
| 797 | } |
| 798 | |
| 799 | static int |
| 800 | io_subchannel_probe (struct device *pdev) |
| 801 | { |
| 802 | struct subchannel *sch; |
| 803 | struct ccw_device *cdev; |
| 804 | int rc; |
| 805 | unsigned long flags; |
| 806 | |
| 807 | sch = to_subchannel(pdev); |
| 808 | if (sch->dev.driver_data) { |
| 809 | /* |
| 810 | * This subchannel already has an associated ccw_device. |
| 811 | * Register it and exit. This happens for all early |
| 812 | * device, e.g. the console. |
| 813 | */ |
| 814 | cdev = sch->dev.driver_data; |
| 815 | device_initialize(&cdev->dev); |
| 816 | ccw_device_register(cdev); |
| 817 | subchannel_add_files(&sch->dev); |
| 818 | /* |
| 819 | * Check if the device is already online. If it is |
| 820 | * the reference count needs to be corrected |
| 821 | * (see ccw_device_online and css_init_done for the |
| 822 | * ugly details). |
| 823 | */ |
| 824 | if (cdev->private->state != DEV_STATE_NOT_OPER && |
| 825 | cdev->private->state != DEV_STATE_OFFLINE && |
| 826 | cdev->private->state != DEV_STATE_BOXED) |
| 827 | get_device(&cdev->dev); |
| 828 | return 0; |
| 829 | } |
| 830 | cdev = kmalloc (sizeof(*cdev), GFP_KERNEL); |
| 831 | if (!cdev) |
| 832 | return -ENOMEM; |
| 833 | memset(cdev, 0, sizeof(struct ccw_device)); |
| 834 | cdev->private = kmalloc(sizeof(struct ccw_device_private), |
| 835 | GFP_KERNEL | GFP_DMA); |
| 836 | if (!cdev->private) { |
| 837 | kfree(cdev); |
| 838 | return -ENOMEM; |
| 839 | } |
| 840 | memset(cdev->private, 0, sizeof(struct ccw_device_private)); |
| 841 | atomic_set(&cdev->private->onoff, 0); |
| 842 | cdev->dev = (struct device) { |
| 843 | .parent = pdev, |
| 844 | .release = ccw_device_release, |
| 845 | }; |
| 846 | INIT_LIST_HEAD(&cdev->private->kick_work.entry); |
| 847 | /* Do first half of device_register. */ |
| 848 | device_initialize(&cdev->dev); |
| 849 | |
| 850 | if (!get_device(&sch->dev)) { |
| 851 | if (cdev->dev.release) |
| 852 | cdev->dev.release(&cdev->dev); |
| 853 | return -ENODEV; |
| 854 | } |
| 855 | |
| 856 | rc = io_subchannel_recog(cdev, to_subchannel(pdev)); |
| 857 | if (rc) { |
| 858 | spin_lock_irqsave(&sch->lock, flags); |
| 859 | sch->dev.driver_data = NULL; |
| 860 | spin_unlock_irqrestore(&sch->lock, flags); |
| 861 | if (cdev->dev.release) |
| 862 | cdev->dev.release(&cdev->dev); |
| 863 | } |
| 864 | |
| 865 | return rc; |
| 866 | } |
| 867 | |
| 868 | static void |
| 869 | ccw_device_unregister(void *data) |
| 870 | { |
| 871 | struct ccw_device *cdev; |
| 872 | |
| 873 | cdev = (struct ccw_device *)data; |
| 874 | if (test_and_clear_bit(1, &cdev->private->registered)) |
| 875 | device_unregister(&cdev->dev); |
| 876 | put_device(&cdev->dev); |
| 877 | } |
| 878 | |
| 879 | static int |
| 880 | io_subchannel_remove (struct device *dev) |
| 881 | { |
| 882 | struct ccw_device *cdev; |
| 883 | unsigned long flags; |
| 884 | |
| 885 | if (!dev->driver_data) |
| 886 | return 0; |
| 887 | cdev = dev->driver_data; |
| 888 | /* Set ccw device to not operational and drop reference. */ |
| 889 | spin_lock_irqsave(cdev->ccwlock, flags); |
| 890 | dev->driver_data = NULL; |
| 891 | cdev->private->state = DEV_STATE_NOT_OPER; |
| 892 | spin_unlock_irqrestore(cdev->ccwlock, flags); |
| 893 | /* |
| 894 | * Put unregistration on workqueue to avoid livelocks on the css bus |
| 895 | * semaphore. |
| 896 | */ |
| 897 | if (get_device(&cdev->dev)) { |
| 898 | PREPARE_WORK(&cdev->private->kick_work, |
| 899 | ccw_device_unregister, (void *) cdev); |
| 900 | queue_work(ccw_device_work, &cdev->private->kick_work); |
| 901 | } |
| 902 | return 0; |
| 903 | } |
| 904 | |
| 905 | static int |
| 906 | io_subchannel_notify(struct device *dev, int event) |
| 907 | { |
| 908 | struct ccw_device *cdev; |
| 909 | |
| 910 | cdev = dev->driver_data; |
| 911 | if (!cdev) |
| 912 | return 0; |
| 913 | if (!cdev->drv) |
| 914 | return 0; |
| 915 | if (!cdev->online) |
| 916 | return 0; |
| 917 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; |
| 918 | } |
| 919 | |
| 920 | static void |
| 921 | io_subchannel_verify(struct device *dev) |
| 922 | { |
| 923 | struct ccw_device *cdev; |
| 924 | |
| 925 | cdev = dev->driver_data; |
| 926 | if (cdev) |
| 927 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); |
| 928 | } |
| 929 | |
| 930 | static void |
| 931 | io_subchannel_ioterm(struct device *dev) |
| 932 | { |
| 933 | struct ccw_device *cdev; |
| 934 | |
| 935 | cdev = dev->driver_data; |
| 936 | if (!cdev) |
| 937 | return; |
| 938 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
| 939 | if (cdev->handler) |
| 940 | cdev->handler(cdev, cdev->private->intparm, |
| 941 | ERR_PTR(-EIO)); |
| 942 | } |
| 943 | |
| 944 | static void |
| 945 | io_subchannel_shutdown(struct device *dev) |
| 946 | { |
| 947 | struct subchannel *sch; |
| 948 | struct ccw_device *cdev; |
| 949 | int ret; |
| 950 | |
| 951 | sch = to_subchannel(dev); |
| 952 | cdev = dev->driver_data; |
| 953 | |
| 954 | if (cio_is_console(sch->irq)) |
| 955 | return; |
| 956 | if (!sch->schib.pmcw.ena) |
| 957 | /* Nothing to do. */ |
| 958 | return; |
| 959 | ret = cio_disable_subchannel(sch); |
| 960 | if (ret != -EBUSY) |
| 961 | /* Subchannel is disabled, we're done. */ |
| 962 | return; |
| 963 | cdev->private->state = DEV_STATE_QUIESCE; |
| 964 | if (cdev->handler) |
| 965 | cdev->handler(cdev, cdev->private->intparm, |
| 966 | ERR_PTR(-EIO)); |
| 967 | ret = ccw_device_cancel_halt_clear(cdev); |
| 968 | if (ret == -EBUSY) { |
| 969 | ccw_device_set_timeout(cdev, HZ/10); |
| 970 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); |
| 971 | } |
| 972 | cio_disable_subchannel(sch); |
| 973 | } |
| 974 | |
| 975 | #ifdef CONFIG_CCW_CONSOLE |
| 976 | static struct ccw_device console_cdev; |
| 977 | static struct ccw_device_private console_private; |
| 978 | static int console_cdev_in_use; |
| 979 | |
| 980 | static int |
| 981 | ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch) |
| 982 | { |
| 983 | int rc; |
| 984 | |
| 985 | /* Initialize the ccw_device structure. */ |
| 986 | cdev->dev = (struct device) { |
| 987 | .parent = &sch->dev, |
| 988 | }; |
| 989 | /* Initialize the subchannel structure */ |
| 990 | sch->dev.parent = &css_bus_device; |
| 991 | sch->dev.bus = &css_bus_type; |
| 992 | |
| 993 | rc = io_subchannel_recog(cdev, sch); |
| 994 | if (rc) |
| 995 | return rc; |
| 996 | |
| 997 | /* Now wait for the async. recognition to come to an end. */ |
| 998 | spin_lock_irq(cdev->ccwlock); |
| 999 | while (!dev_fsm_final_state(cdev)) |
| 1000 | wait_cons_dev(); |
| 1001 | rc = -EIO; |
| 1002 | if (cdev->private->state != DEV_STATE_OFFLINE) |
| 1003 | goto out_unlock; |
| 1004 | ccw_device_online(cdev); |
| 1005 | while (!dev_fsm_final_state(cdev)) |
| 1006 | wait_cons_dev(); |
| 1007 | if (cdev->private->state != DEV_STATE_ONLINE) |
| 1008 | goto out_unlock; |
| 1009 | rc = 0; |
| 1010 | out_unlock: |
| 1011 | spin_unlock_irq(cdev->ccwlock); |
| 1012 | return 0; |
| 1013 | } |
| 1014 | |
| 1015 | struct ccw_device * |
| 1016 | ccw_device_probe_console(void) |
| 1017 | { |
| 1018 | struct subchannel *sch; |
| 1019 | int ret; |
| 1020 | |
| 1021 | if (xchg(&console_cdev_in_use, 1) != 0) |
| 1022 | return NULL; |
| 1023 | sch = cio_probe_console(); |
| 1024 | if (IS_ERR(sch)) { |
| 1025 | console_cdev_in_use = 0; |
| 1026 | return (void *) sch; |
| 1027 | } |
| 1028 | memset(&console_cdev, 0, sizeof(struct ccw_device)); |
| 1029 | memset(&console_private, 0, sizeof(struct ccw_device_private)); |
| 1030 | console_cdev.private = &console_private; |
| 1031 | ret = ccw_device_console_enable(&console_cdev, sch); |
| 1032 | if (ret) { |
| 1033 | cio_release_console(); |
| 1034 | console_cdev_in_use = 0; |
| 1035 | return ERR_PTR(ret); |
| 1036 | } |
| 1037 | console_cdev.online = 1; |
| 1038 | return &console_cdev; |
| 1039 | } |
| 1040 | #endif |
| 1041 | |
| 1042 | /* |
| 1043 | * get ccw_device matching the busid, but only if owned by cdrv |
| 1044 | */ |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 1045 | static int |
| 1046 | __ccwdev_check_busid(struct device *dev, void *id) |
| 1047 | { |
| 1048 | char *bus_id; |
| 1049 | |
| 1050 | bus_id = (char *)id; |
| 1051 | |
| 1052 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); |
| 1053 | } |
| 1054 | |
| 1055 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | struct ccw_device * |
| 1057 | get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id) |
| 1058 | { |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 1059 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | struct device_driver *drv; |
| 1061 | |
| 1062 | drv = get_driver(&cdrv->driver); |
| 1063 | if (!drv) |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 1064 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 1066 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
| 1067 | __ccwdev_check_busid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | put_driver(drv); |
| 1069 | |
| 1070 | return dev ? to_ccwdev(dev) : 0; |
| 1071 | } |
| 1072 | |
| 1073 | /************************** device driver handling ************************/ |
| 1074 | |
| 1075 | /* This is the implementation of the ccw_driver class. The probe, remove |
| 1076 | * and release methods are initially very similar to the device_driver |
| 1077 | * implementations, with the difference that they have ccw_device |
| 1078 | * arguments. |
| 1079 | * |
| 1080 | * A ccw driver also contains the information that is needed for |
| 1081 | * device matching. |
| 1082 | */ |
| 1083 | static int |
| 1084 | ccw_device_probe (struct device *dev) |
| 1085 | { |
| 1086 | struct ccw_device *cdev = to_ccwdev(dev); |
| 1087 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); |
| 1088 | int ret; |
| 1089 | |
| 1090 | cdev->drv = cdrv; /* to let the driver call _set_online */ |
| 1091 | |
| 1092 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; |
| 1093 | |
| 1094 | if (ret) { |
| 1095 | cdev->drv = 0; |
| 1096 | return ret; |
| 1097 | } |
| 1098 | |
| 1099 | return 0; |
| 1100 | } |
| 1101 | |
| 1102 | static int |
| 1103 | ccw_device_remove (struct device *dev) |
| 1104 | { |
| 1105 | struct ccw_device *cdev = to_ccwdev(dev); |
| 1106 | struct ccw_driver *cdrv = cdev->drv; |
| 1107 | int ret; |
| 1108 | |
| 1109 | pr_debug("removing device %s\n", cdev->dev.bus_id); |
| 1110 | if (cdrv->remove) |
| 1111 | cdrv->remove(cdev); |
| 1112 | if (cdev->online) { |
| 1113 | cdev->online = 0; |
| 1114 | spin_lock_irq(cdev->ccwlock); |
| 1115 | ret = ccw_device_offline(cdev); |
| 1116 | spin_unlock_irq(cdev->ccwlock); |
| 1117 | if (ret == 0) |
| 1118 | wait_event(cdev->private->wait_q, |
| 1119 | dev_fsm_final_state(cdev)); |
| 1120 | else |
| 1121 | //FIXME: we can't fail! |
| 1122 | pr_debug("ccw_device_offline returned %d, device %s\n", |
| 1123 | ret, cdev->dev.bus_id); |
| 1124 | } |
| 1125 | ccw_device_set_timeout(cdev, 0); |
| 1126 | cdev->drv = 0; |
| 1127 | return 0; |
| 1128 | } |
| 1129 | |
| 1130 | int |
| 1131 | ccw_driver_register (struct ccw_driver *cdriver) |
| 1132 | { |
| 1133 | struct device_driver *drv = &cdriver->driver; |
| 1134 | |
| 1135 | drv->bus = &ccw_bus_type; |
| 1136 | drv->name = cdriver->name; |
| 1137 | drv->probe = ccw_device_probe; |
| 1138 | drv->remove = ccw_device_remove; |
| 1139 | |
| 1140 | return driver_register(drv); |
| 1141 | } |
| 1142 | |
| 1143 | void |
| 1144 | ccw_driver_unregister (struct ccw_driver *cdriver) |
| 1145 | { |
| 1146 | driver_unregister(&cdriver->driver); |
| 1147 | } |
| 1148 | |
| 1149 | MODULE_LICENSE("GPL"); |
| 1150 | EXPORT_SYMBOL(ccw_device_set_online); |
| 1151 | EXPORT_SYMBOL(ccw_device_set_offline); |
| 1152 | EXPORT_SYMBOL(ccw_driver_register); |
| 1153 | EXPORT_SYMBOL(ccw_driver_unregister); |
| 1154 | EXPORT_SYMBOL(get_ccwdev_by_busid); |
| 1155 | EXPORT_SYMBOL(ccw_bus_type); |
| 1156 | EXPORT_SYMBOL(ccw_device_work); |
| 1157 | EXPORT_SYMBOL(ccw_device_notify_work); |