blob: f3b890da1e874b832b6dbab7dd919d94567955cf [file] [log] [blame]
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001/*
2 * Device probing and sysfs code.
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05003 *
4 * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
Stefan Richterd54423c2010-02-18 01:50:31 +010021#include <linux/bug.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010022#include <linux/ctype.h>
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050023#include <linux/delay.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010024#include <linux/device.h>
25#include <linux/errno.h>
Stefan Richter77c9a5d2009-06-05 16:26:18 +020026#include <linux/firewire.h>
27#include <linux/firewire-constants.h>
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -050028#include <linux/idr.h>
Stefan Richter3d36a0d2009-01-17 22:45:54 +010029#include <linux/jiffies.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010030#include <linux/kobject.h>
31#include <linux/list.h>
Stefan Richterb3b29882009-02-15 23:12:34 +010032#include <linux/mod_devicetable.h>
Stefan Richtere8ca9702009-06-04 21:09:38 +020033#include <linux/module.h>
Stefan Richterd67cfb92008-10-05 10:37:11 +020034#include <linux/mutex.h>
Matthew Wilcox6188e102008-04-18 22:21:05 -040035#include <linux/rwsem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Jay Fenlasoncf417e542008-10-03 11:19:09 -040037#include <linux/spinlock.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010038#include <linux/string.h>
39#include <linux/workqueue.h>
40
Arun Sharma600634972011-07-26 16:09:06 -070041#include <linux/atomic.h>
Stefan Richtere8ca9702009-06-04 21:09:38 +020042#include <asm/byteorder.h>
Stefan Richterb5d2a5e2008-01-25 18:57:41 +010043#include <asm/system.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010044
Stefan Richter77c9a5d2009-06-05 16:26:18 +020045#include "core.h"
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050046
Stefan Richter13b302d2009-12-26 01:44:10 +010047void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050048{
49 ci->p = p + 1;
50 ci->end = ci->p + (p[0] >> 16);
51}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050052EXPORT_SYMBOL(fw_csr_iterator_init);
53
54int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
55{
56 *key = *ci->p >> 24;
57 *value = *ci->p & 0xffffff;
58
59 return ci->p++ < ci->end;
60}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050061EXPORT_SYMBOL(fw_csr_iterator_next);
62
Stefan Richter13b302d2009-12-26 01:44:10 +010063static const u32 *search_leaf(const u32 *directory, int search_key)
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010064{
65 struct fw_csr_iterator ci;
66 int last_key = 0, key, value;
67
68 fw_csr_iterator_init(&ci, directory);
69 while (fw_csr_iterator_next(&ci, &key, &value)) {
70 if (last_key == search_key &&
71 key == (CSR_DESCRIPTOR | CSR_LEAF))
72 return ci.p - 1 + value;
Stefan Richter3c2c58c2009-12-26 01:43:21 +010073
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010074 last_key = key;
75 }
Stefan Richter3c2c58c2009-12-26 01:43:21 +010076
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010077 return NULL;
78}
79
Stefan Richter13b302d2009-12-26 01:44:10 +010080static int textual_leaf_to_string(const u32 *block, char *buf, size_t size)
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010081{
Stefan Richter3c2c58c2009-12-26 01:43:21 +010082 unsigned int quadlets, i;
83 char c;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010084
85 if (!size || !buf)
86 return -EINVAL;
87
Stefan Richter3c2c58c2009-12-26 01:43:21 +010088 quadlets = min(block[0] >> 16, 256U);
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010089 if (quadlets < 2)
90 return -ENODATA;
91
92 if (block[1] != 0 || block[2] != 0)
93 /* unknown language/character set */
94 return -ENODATA;
95
96 block += 3;
97 quadlets -= 2;
Stefan Richter3c2c58c2009-12-26 01:43:21 +010098 for (i = 0; i < quadlets * 4 && i < size - 1; i++) {
99 c = block[i / 4] >> (24 - 8 * (i % 4));
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100100 if (c == '\0')
101 break;
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100102 buf[i] = c;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100103 }
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100104 buf[i] = '\0';
105
106 return i;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100107}
108
109/**
Stefan Richter656b7af2010-07-07 13:26:18 +0200110 * fw_csr_string() - reads a string from the configuration ROM
111 * @directory: e.g. root directory or unit directory
112 * @key: the key of the preceding directory entry
113 * @buf: where to put the string
114 * @size: size of @buf, in bytes
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100115 *
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100116 * The string is taken from a minimal ASCII text descriptor leaf after
117 * the immediate entry with @key. The string is zero-terminated.
118 * Returns strlen(buf) or a negative error code.
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100119 */
Stefan Richter13b302d2009-12-26 01:44:10 +0100120int fw_csr_string(const u32 *directory, int key, char *buf, size_t size)
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100121{
Stefan Richter13b302d2009-12-26 01:44:10 +0100122 const u32 *leaf = search_leaf(directory, key);
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100123 if (!leaf)
124 return -ENOENT;
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100125
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100126 return textual_leaf_to_string(leaf, buf, size);
127}
128EXPORT_SYMBOL(fw_csr_string);
129
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100130static void get_ids(const u32 *directory, int *id)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500131{
132 struct fw_csr_iterator ci;
Stefan Richter5ae73512010-03-19 00:38:29 +0100133 int key, value;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500134
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500135 fw_csr_iterator_init(&ci, directory);
136 while (fw_csr_iterator_next(&ci, &key, &value)) {
Stefan Richter5ae73512010-03-19 00:38:29 +0100137 switch (key) {
138 case CSR_VENDOR: id[0] = value; break;
139 case CSR_MODEL: id[1] = value; break;
140 case CSR_SPECIFIER_ID: id[2] = value; break;
141 case CSR_VERSION: id[3] = value; break;
142 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500143 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500144}
145
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100146static void get_modalias_ids(struct fw_unit *unit, int *id)
147{
148 get_ids(&fw_parent_device(unit)->config_rom[5], id);
149 get_ids(unit->directory, id);
150}
151
152static bool match_ids(const struct ieee1394_device_id *id_table, int *id)
153{
154 int match = 0;
155
156 if (id[0] == id_table->vendor_id)
157 match |= IEEE1394_MATCH_VENDOR_ID;
158 if (id[1] == id_table->model_id)
159 match |= IEEE1394_MATCH_MODEL_ID;
160 if (id[2] == id_table->specifier_id)
161 match |= IEEE1394_MATCH_SPECIFIER_ID;
162 if (id[3] == id_table->version)
163 match |= IEEE1394_MATCH_VERSION;
164
165 return (match & id_table->match_flags) == id_table->match_flags;
166}
167
168static bool is_fw_unit(struct device *dev);
169
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500170static int fw_unit_match(struct device *dev, struct device_driver *drv)
171{
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100172 const struct ieee1394_device_id *id_table =
173 container_of(drv, struct fw_driver, driver)->id_table;
174 int id[] = {0, 0, 0, 0};
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500175
176 /* We only allow binding to fw_units. */
177 if (!is_fw_unit(dev))
178 return 0;
179
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100180 get_modalias_ids(fw_unit(dev), id);
Stefan Richtere41f8d72009-02-16 00:22:05 +0100181
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100182 for (; id_table->match_flags != 0; id_table++)
183 if (match_ids(id_table, id))
Stefan Richtere41f8d72009-02-16 00:22:05 +0100184 return 1;
185
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500186 return 0;
187}
188
189static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
190{
Stefan Richter5ae73512010-03-19 00:38:29 +0100191 int id[] = {0, 0, 0, 0};
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500192
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100193 get_modalias_ids(unit, id);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500194
195 return snprintf(buffer, buffer_size,
196 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
Stefan Richter5ae73512010-03-19 00:38:29 +0100197 id[0], id[1], id[2], id[3]);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500198}
199
Stefan Richter53dca512008-12-14 21:47:04 +0100200static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500201{
202 struct fw_unit *unit = fw_unit(dev);
203 char modalias[64];
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500204
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400205 get_modalias(unit, modalias, sizeof(modalias));
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500206
Kay Sievers7eff2e72007-08-14 15:15:12 +0200207 if (add_uevent_var(env, "MODALIAS=%s", modalias))
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500208 return -ENOMEM;
209
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500210 return 0;
211}
212
213struct bus_type fw_bus_type = {
Kristian Høgsberg362c2c82007-02-06 14:49:37 -0500214 .name = "firewire",
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500215 .match = fw_unit_match,
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500216};
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500217EXPORT_SYMBOL(fw_bus_type);
218
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500219int fw_device_enable_phys_dma(struct fw_device *device)
220{
Stefan Richterb5d2a5e2008-01-25 18:57:41 +0100221 int generation = device->generation;
222
223 /* device->node_id, accessed below, must not be older than generation */
224 smp_rmb();
225
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500226 return device->card->driver->enable_phys_dma(device->card,
227 device->node_id,
Stefan Richterb5d2a5e2008-01-25 18:57:41 +0100228 generation);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500229}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500230EXPORT_SYMBOL(fw_device_enable_phys_dma);
231
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400232struct config_rom_attribute {
233 struct device_attribute attr;
234 u32 key;
235};
236
Stefan Richter53dca512008-12-14 21:47:04 +0100237static ssize_t show_immediate(struct device *dev,
238 struct device_attribute *dattr, char *buf)
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400239{
240 struct config_rom_attribute *attr =
241 container_of(dattr, struct config_rom_attribute, attr);
242 struct fw_csr_iterator ci;
Stefan Richter13b302d2009-12-26 01:44:10 +0100243 const u32 *dir;
Stefan Richterc9755e12008-03-24 20:54:28 +0100244 int key, value, ret = -ENOENT;
245
246 down_read(&fw_device_rwsem);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400247
248 if (is_fw_unit(dev))
249 dir = fw_unit(dev)->directory;
250 else
251 dir = fw_device(dev)->config_rom + 5;
252
253 fw_csr_iterator_init(&ci, dir);
254 while (fw_csr_iterator_next(&ci, &key, &value))
Stefan Richterc9755e12008-03-24 20:54:28 +0100255 if (attr->key == key) {
256 ret = snprintf(buf, buf ? PAGE_SIZE : 0,
257 "0x%06x\n", value);
258 break;
259 }
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400260
Stefan Richterc9755e12008-03-24 20:54:28 +0100261 up_read(&fw_device_rwsem);
262
263 return ret;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400264}
265
266#define IMMEDIATE_ATTR(name, key) \
267 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
268
Stefan Richter53dca512008-12-14 21:47:04 +0100269static ssize_t show_text_leaf(struct device *dev,
270 struct device_attribute *dattr, char *buf)
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400271{
272 struct config_rom_attribute *attr =
273 container_of(dattr, struct config_rom_attribute, attr);
Stefan Richter13b302d2009-12-26 01:44:10 +0100274 const u32 *dir;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100275 size_t bufsize;
276 char dummy_buf[2];
277 int ret;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400278
Stefan Richterc9755e12008-03-24 20:54:28 +0100279 down_read(&fw_device_rwsem);
280
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400281 if (is_fw_unit(dev))
282 dir = fw_unit(dev)->directory;
283 else
284 dir = fw_device(dev)->config_rom + 5;
285
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100286 if (buf) {
287 bufsize = PAGE_SIZE - 1;
288 } else {
289 buf = dummy_buf;
290 bufsize = 1;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400291 }
292
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100293 ret = fw_csr_string(dir, attr->key, buf, bufsize);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400294
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100295 if (ret >= 0) {
296 /* Strip trailing whitespace and add newline. */
297 while (ret > 0 && isspace(buf[ret - 1]))
298 ret--;
299 strcpy(buf + ret, "\n");
300 ret++;
Stefan Richterc9755e12008-03-24 20:54:28 +0100301 }
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400302
Stefan Richterc9755e12008-03-24 20:54:28 +0100303 up_read(&fw_device_rwsem);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400304
Stefan Richterc9755e12008-03-24 20:54:28 +0100305 return ret;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400306}
307
308#define TEXT_LEAF_ATTR(name, key) \
309 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
310
311static struct config_rom_attribute config_rom_attributes[] = {
312 IMMEDIATE_ATTR(vendor, CSR_VENDOR),
313 IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
314 IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
315 IMMEDIATE_ATTR(version, CSR_VERSION),
316 IMMEDIATE_ATTR(model, CSR_MODEL),
317 TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
318 TEXT_LEAF_ATTR(model_name, CSR_MODEL),
319 TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
320};
321
Stefan Richter53dca512008-12-14 21:47:04 +0100322static void init_fw_attribute_group(struct device *dev,
323 struct device_attribute *attrs,
324 struct fw_attribute_group *group)
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400325{
326 struct device_attribute *attr;
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400327 int i, j;
328
329 for (j = 0; attrs[j].attr.name != NULL; j++)
330 group->attrs[j] = &attrs[j].attr;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400331
332 for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
333 attr = &config_rom_attributes[i].attr;
334 if (attr->show(dev, attr, NULL) < 0)
335 continue;
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400336 group->attrs[j++] = &attr->attr;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400337 }
338
Stefan Richtere5333db2009-05-22 23:16:27 +0200339 group->attrs[j] = NULL;
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400340 group->groups[0] = &group->group;
341 group->groups[1] = NULL;
342 group->group.attrs = group->attrs;
David Brownella4dbd672009-06-24 10:06:31 -0700343 dev->groups = (const struct attribute_group **) group->groups;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400344}
345
Stefan Richter53dca512008-12-14 21:47:04 +0100346static ssize_t modalias_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500348{
349 struct fw_unit *unit = fw_unit(dev);
350 int length;
351
352 length = get_modalias(unit, buf, PAGE_SIZE);
353 strcpy(buf + length, "\n");
354
355 return length + 1;
356}
357
Stefan Richter53dca512008-12-14 21:47:04 +0100358static ssize_t rom_index_show(struct device *dev,
359 struct device_attribute *attr, char *buf)
Kristian Høgsberg048961e2007-03-07 12:12:46 -0500360{
361 struct fw_device *device = fw_device(dev->parent);
362 struct fw_unit *unit = fw_unit(dev);
363
364 return snprintf(buf, PAGE_SIZE, "%d\n",
Stefan Richterd84702a2007-03-20 19:42:15 +0100365 (int)(unit->directory - device->config_rom));
Kristian Høgsberg048961e2007-03-07 12:12:46 -0500366}
367
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400368static struct device_attribute fw_unit_attributes[] = {
369 __ATTR_RO(modalias),
370 __ATTR_RO(rom_index),
371 __ATTR_NULL,
372};
373
Stefan Richter53dca512008-12-14 21:47:04 +0100374static ssize_t config_rom_show(struct device *dev,
375 struct device_attribute *attr, char *buf)
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400376{
377 struct fw_device *device = fw_device(dev);
Stefan Richterc9755e12008-03-24 20:54:28 +0100378 size_t length;
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400379
Stefan Richterc9755e12008-03-24 20:54:28 +0100380 down_read(&fw_device_rwsem);
381 length = device->config_rom_length * 4;
382 memcpy(buf, device->config_rom, length);
383 up_read(&fw_device_rwsem);
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400384
Stefan Richterc9755e12008-03-24 20:54:28 +0100385 return length;
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400386}
387
Stefan Richter53dca512008-12-14 21:47:04 +0100388static ssize_t guid_show(struct device *dev,
389 struct device_attribute *attr, char *buf)
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400390{
391 struct fw_device *device = fw_device(dev);
Stefan Richterc9755e12008-03-24 20:54:28 +0100392 int ret;
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400393
Stefan Richterc9755e12008-03-24 20:54:28 +0100394 down_read(&fw_device_rwsem);
395 ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
396 device->config_rom[3], device->config_rom[4]);
397 up_read(&fw_device_rwsem);
398
399 return ret;
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400400}
401
Stefan Richter13b302d2009-12-26 01:44:10 +0100402static int units_sprintf(char *buf, const u32 *directory)
Stefan Richter0210b662009-05-23 00:03:29 +0200403{
404 struct fw_csr_iterator ci;
405 int key, value;
406 int specifier_id = 0;
407 int version = 0;
408
409 fw_csr_iterator_init(&ci, directory);
410 while (fw_csr_iterator_next(&ci, &key, &value)) {
411 switch (key) {
412 case CSR_SPECIFIER_ID:
413 specifier_id = value;
414 break;
415 case CSR_VERSION:
416 version = value;
417 break;
418 }
419 }
420
421 return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version);
422}
423
424static ssize_t units_show(struct device *dev,
425 struct device_attribute *attr, char *buf)
426{
427 struct fw_device *device = fw_device(dev);
428 struct fw_csr_iterator ci;
429 int key, value, i = 0;
430
431 down_read(&fw_device_rwsem);
432 fw_csr_iterator_init(&ci, &device->config_rom[5]);
433 while (fw_csr_iterator_next(&ci, &key, &value)) {
434 if (key != (CSR_UNIT | CSR_DIRECTORY))
435 continue;
436 i += units_sprintf(&buf[i], ci.p + value - 1);
437 if (i >= PAGE_SIZE - (8 + 1 + 8 + 1))
438 break;
439 }
440 up_read(&fw_device_rwsem);
441
442 if (i)
443 buf[i - 1] = '\n';
444
445 return i;
446}
447
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400448static struct device_attribute fw_device_attributes[] = {
449 __ATTR_RO(config_rom),
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400450 __ATTR_RO(guid),
Stefan Richter0210b662009-05-23 00:03:29 +0200451 __ATTR_RO(units),
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400452 __ATTR_NULL,
Kristian Høgsberg048961e2007-03-07 12:12:46 -0500453};
454
Stefan Richter53dca512008-12-14 21:47:04 +0100455static int read_rom(struct fw_device *device,
456 int generation, int index, u32 *data)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500457{
Stefan Richteraaff1202011-08-07 15:20:18 +0200458 u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4;
459 int i, rcode;
Stefan Richterb5d2a5e2008-01-25 18:57:41 +0100460
461 /* device->node_id, accessed below, must not be older than generation */
462 smp_rmb();
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500463
Stefan Richteraaff1202011-08-07 15:20:18 +0200464 for (i = 10; i < 100; i += 10) {
465 rcode = fw_run_transaction(device->card,
466 TCODE_READ_QUADLET_REQUEST, device->node_id,
467 generation, device->max_speed, offset, data, 4);
468 if (rcode != RCODE_BUSY)
469 break;
470 msleep(i);
471 }
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200472 be32_to_cpus(data);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500473
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200474 return rcode;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500475}
476
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100477#define MAX_CONFIG_ROM_SIZE 256
Stefan Richter1dadff72008-03-02 19:35:42 +0100478
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100479/*
480 * Read the bus info block, perform a speed probe, and read all of the rest of
481 * the config ROM. We do all this with a cached bus generation. If the bus
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100482 * generation changes under us, read_config_rom will fail and get retried.
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100483 * It's better to start all over in this case because the node from which we
484 * are reading the ROM may have changed the ROM during the reset.
485 */
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100486static int read_config_rom(struct fw_device *device, int generation)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500487{
Stefan Richter13b302d2009-12-26 01:44:10 +0100488 const u32 *old_rom, *new_rom;
489 u32 *rom, *stack;
Stefan Richter1dadff72008-03-02 19:35:42 +0100490 u32 sp, key;
491 int i, end, length, ret = -1;
492
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100493 rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
494 sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
Stefan Richter1dadff72008-03-02 19:35:42 +0100495 if (rom == NULL)
496 return -ENOMEM;
497
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100498 stack = &rom[MAX_CONFIG_ROM_SIZE];
499 memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500500
Stefan Richterf1397492007-06-10 21:31:36 +0200501 device->max_speed = SCODE_100;
502
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500503 /* First read the bus info block. */
504 for (i = 0; i < 5; i++) {
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100505 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
Stefan Richter1dadff72008-03-02 19:35:42 +0100506 goto out;
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400507 /*
508 * As per IEEE1212 7.2, during power-up, devices can
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500509 * reply with a 0 for the first quadlet of the config
510 * rom to indicate that they are booting (for example,
511 * if the firmware is on the disk of a external
512 * harddisk). In that case we just fail, and the
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400513 * retry mechanism will try again later.
514 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500515 if (i == 0 && rom[i] == 0)
Stefan Richter1dadff72008-03-02 19:35:42 +0100516 goto out;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500517 }
518
Stefan Richterf1397492007-06-10 21:31:36 +0200519 device->max_speed = device->node->max_speed;
520
521 /*
522 * Determine the speed of
523 * - devices with link speed less than PHY speed,
524 * - devices with 1394b PHY (unless only connected to 1394a PHYs),
525 * - all devices if there are 1394b repeaters.
526 * Note, we cannot use the bus info block's link_spd as starting point
527 * because some buggy firmwares set it lower than necessary and because
528 * 1394-1995 nodes do not have the field.
529 */
530 if ((rom[2] & 0x7) < device->max_speed ||
531 device->max_speed == SCODE_BETA ||
532 device->card->beta_repeaters_present) {
533 u32 dummy;
534
535 /* for S1600 and S3200 */
536 if (device->max_speed == SCODE_BETA)
537 device->max_speed = device->card->link_speed;
538
539 while (device->max_speed > SCODE_100) {
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100540 if (read_rom(device, generation, 0, &dummy) ==
541 RCODE_COMPLETE)
Stefan Richterf1397492007-06-10 21:31:36 +0200542 break;
543 device->max_speed--;
544 }
545 }
546
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400547 /*
548 * Now parse the config rom. The config rom is a recursive
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500549 * directory structure so we parse it using a stack of
550 * references to the blocks that make up the structure. We
551 * push a reference to the root directory on the stack to
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400552 * start things off.
553 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500554 length = i;
555 sp = 0;
556 stack[sp++] = 0xc0000005;
557 while (sp > 0) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400558 /*
559 * Pop the next block reference of the stack. The
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500560 * lower 24 bits is the offset into the config rom,
561 * the upper 8 bits are the type of the reference the
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400562 * block.
563 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500564 key = stack[--sp];
565 i = key & 0xffffff;
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100566 if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE))
Stefan Richter1dadff72008-03-02 19:35:42 +0100567 goto out;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500568
569 /* Read header quadlet for the block to get the length. */
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100570 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
Stefan Richter1dadff72008-03-02 19:35:42 +0100571 goto out;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500572 end = i + (rom[i] >> 16) + 1;
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100573 if (end > MAX_CONFIG_ROM_SIZE) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400574 /*
Stefan Richter2799d5c2010-02-18 01:52:45 +0100575 * This block extends outside the config ROM which is
576 * a firmware bug. Ignore this whole block, i.e.
577 * simply set a fake block length of 0.
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400578 */
Stefan Richter2799d5c2010-02-18 01:52:45 +0100579 fw_error("skipped invalid ROM block %x at %llx\n",
580 rom[i],
581 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
582 rom[i] = 0;
583 end = i;
584 }
585 i++;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500586
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400587 /*
588 * Now read in the block. If this is a directory
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500589 * block, check the entries as we read them to see if
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400590 * it references another block, and push it in that case.
591 */
Stefan Richterd54423c2010-02-18 01:50:31 +0100592 for (; i < end; i++) {
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100593 if (read_rom(device, generation, i, &rom[i]) !=
594 RCODE_COMPLETE)
Stefan Richter1dadff72008-03-02 19:35:42 +0100595 goto out;
Stefan Richterd54423c2010-02-18 01:50:31 +0100596
Stefan Richter58aaa542010-02-18 01:54:00 +0100597 if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
Stefan Richterd54423c2010-02-18 01:50:31 +0100598 continue;
599 /*
600 * Offset points outside the ROM. May be a firmware
601 * bug or an Extended ROM entry (IEEE 1212-2001 clause
602 * 7.7.18). Simply overwrite this pointer here by a
603 * fake immediate entry so that later iterators over
604 * the ROM don't have to check offsets all the time.
605 */
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100606 if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) {
Stefan Richterd54423c2010-02-18 01:50:31 +0100607 fw_error("skipped unsupported ROM entry %x at %llx\n",
608 rom[i],
609 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
610 rom[i] = 0;
611 continue;
612 }
613 stack[sp++] = i + rom[i];
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500614 }
615 if (length < i)
616 length = i;
617 }
618
Stefan Richterc9755e12008-03-24 20:54:28 +0100619 old_rom = device->config_rom;
620 new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
621 if (new_rom == NULL)
Stefan Richter1dadff72008-03-02 19:35:42 +0100622 goto out;
Stefan Richterc9755e12008-03-24 20:54:28 +0100623
624 down_write(&fw_device_rwsem);
625 device->config_rom = new_rom;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500626 device->config_rom_length = length;
Stefan Richterc9755e12008-03-24 20:54:28 +0100627 up_write(&fw_device_rwsem);
628
629 kfree(old_rom);
Stefan Richter1dadff72008-03-02 19:35:42 +0100630 ret = 0;
Stefan Richter837ec782009-06-09 23:56:55 +0200631 device->max_rec = rom[2] >> 12 & 0xf;
632 device->cmc = rom[2] >> 30 & 1;
633 device->irmc = rom[2] >> 31 & 1;
Stefan Richter1dadff72008-03-02 19:35:42 +0100634 out:
635 kfree(rom);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500636
Stefan Richter1dadff72008-03-02 19:35:42 +0100637 return ret;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500638}
639
640static void fw_unit_release(struct device *dev)
641{
642 struct fw_unit *unit = fw_unit(dev);
643
644 kfree(unit);
645}
646
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400647static struct device_type fw_unit_type = {
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400648 .uevent = fw_unit_uevent,
649 .release = fw_unit_release,
650};
651
Stefan Richter099d5412009-06-06 18:37:25 +0200652static bool is_fw_unit(struct device *dev)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500653{
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400654 return dev->type == &fw_unit_type;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500655}
656
657static void create_units(struct fw_device *device)
658{
659 struct fw_csr_iterator ci;
660 struct fw_unit *unit;
661 int key, value, i;
662
663 i = 0;
664 fw_csr_iterator_init(&ci, &device->config_rom[5]);
665 while (fw_csr_iterator_next(&ci, &key, &value)) {
666 if (key != (CSR_UNIT | CSR_DIRECTORY))
667 continue;
668
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400669 /*
670 * Get the address of the unit directory and try to
671 * match the drivers id_tables against it.
672 */
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400673 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500674 if (unit == NULL) {
675 fw_error("failed to allocate memory for unit\n");
676 continue;
677 }
678
679 unit->directory = ci.p + value - 1;
680 unit->device.bus = &fw_bus_type;
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400681 unit->device.type = &fw_unit_type;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500682 unit->device.parent = &device->device;
Kay Sieversa1f64812008-10-30 01:41:56 +0100683 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500684
Stefan Richtere5333db2009-05-22 23:16:27 +0200685 BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
686 ARRAY_SIZE(fw_unit_attributes) +
687 ARRAY_SIZE(config_rom_attributes));
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400688 init_fw_attribute_group(&unit->device,
689 fw_unit_attributes,
690 &unit->attribute_group);
Stefan Richtere5333db2009-05-22 23:16:27 +0200691
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400692 if (device_register(&unit->device) < 0)
693 goto skip_unit;
694
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400695 continue;
696
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400697 skip_unit:
698 kfree(unit);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500699 }
700}
701
702static int shutdown_unit(struct device *device, void *data)
703{
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400704 device_unregister(device);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500705
706 return 0;
707}
708
Stefan Richterc9755e12008-03-24 20:54:28 +0100709/*
710 * fw_device_rwsem acts as dual purpose mutex:
711 * - serializes accesses to fw_device_idr,
712 * - serializes accesses to fw_device.config_rom/.config_rom_length and
713 * fw_unit.directory, unless those accesses happen at safe occasions
714 */
715DECLARE_RWSEM(fw_device_rwsem);
716
Stefan Richterd6053e02008-11-24 20:40:00 +0100717DEFINE_IDR(fw_device_idr);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500718int fw_cdev_major;
719
Stefan Richter96b19062008-02-02 15:01:09 +0100720struct fw_device *fw_device_get_by_devt(dev_t devt)
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500721{
722 struct fw_device *device;
723
Stefan Richterc9755e12008-03-24 20:54:28 +0100724 down_read(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500725 device = idr_find(&fw_device_idr, MINOR(devt));
Stefan Richter96b19062008-02-02 15:01:09 +0100726 if (device)
727 fw_device_get(device);
Stefan Richterc9755e12008-03-24 20:54:28 +0100728 up_read(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500729
730 return device;
731}
732
Stefan Richter105e53f2011-05-01 20:50:31 +0200733struct workqueue_struct *fw_workqueue;
734EXPORT_SYMBOL(fw_workqueue);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200735
736static void fw_schedule_device_work(struct fw_device *device,
737 unsigned long delay)
738{
Stefan Richter105e53f2011-05-01 20:50:31 +0200739 queue_delayed_work(fw_workqueue, &device->work, delay);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200740}
741
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400742/*
743 * These defines control the retry behavior for reading the config
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500744 * rom. It shouldn't be necessary to tweak these; if the device
745 * doesn't respond to a config rom read within 10 seconds, it's not
746 * going to respond at all. As for the initial delay, a lot of
747 * devices will be able to respond within half a second after bus
748 * reset. On the other hand, it's not really worth being more
749 * aggressive than that, since it scales pretty well; if 10 devices
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400750 * are plugged in, they're all getting read within one second.
751 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500752
Kristian Høgsbergc5dfd0a2007-03-27 01:43:43 -0400753#define MAX_RETRIES 10
754#define RETRY_DELAY (3 * HZ)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500755#define INITIAL_DELAY (HZ / 2)
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100756#define SHUTDOWN_DELAY (2 * HZ)
757
758static void fw_device_shutdown(struct work_struct *work)
759{
760 struct fw_device *device =
761 container_of(work, struct fw_device, work.work);
762 int minor = MINOR(device->device.devt);
763
Clemens Ladische71084a2011-01-22 15:05:03 +0100764 if (time_before64(get_jiffies_64(),
765 device->card->reset_jiffies + SHUTDOWN_DELAY)
Stefan Richtere747a5c2009-01-24 20:35:38 +0100766 && !list_empty(&device->card->link)) {
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200767 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100768 return;
769 }
770
771 if (atomic_cmpxchg(&device->state,
772 FW_DEVICE_GONE,
773 FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
774 return;
775
776 fw_device_cdev_remove(device);
777 device_for_each_child(&device->device, NULL, shutdown_unit);
778 device_unregister(&device->device);
779
780 down_write(&fw_device_rwsem);
781 idr_remove(&fw_device_idr, minor);
782 up_write(&fw_device_rwsem);
783
784 fw_device_put(device);
785}
786
Stefan Richteraed80892009-01-17 22:45:54 +0100787static void fw_device_release(struct device *dev)
788{
789 struct fw_device *device = fw_device(dev);
790 struct fw_card *card = device->card;
791 unsigned long flags;
792
793 /*
794 * Take the card lock so we don't set this to NULL while a
795 * FW_NODE_UPDATED callback is being handled or while the
796 * bus manager work looks at this node.
797 */
798 spin_lock_irqsave(&card->lock, flags);
799 device->node->data = NULL;
800 spin_unlock_irqrestore(&card->lock, flags);
801
802 fw_node_put(device->node);
803 kfree(device->config_rom);
804 kfree(device);
805 fw_card_put(card);
806}
807
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100808static struct device_type fw_device_type = {
Stefan Richteraed80892009-01-17 22:45:54 +0100809 .release = fw_device_release,
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100810};
811
Stefan Richter099d5412009-06-06 18:37:25 +0200812static bool is_fw_device(struct device *dev)
813{
814 return dev->type == &fw_device_type;
815}
816
Stefan Richteraed80892009-01-17 22:45:54 +0100817static int update_unit(struct device *dev, void *data)
818{
819 struct fw_unit *unit = fw_unit(dev);
820 struct fw_driver *driver = (struct fw_driver *)dev->driver;
821
822 if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800823 device_lock(dev);
Stefan Richteraed80892009-01-17 22:45:54 +0100824 driver->update(unit);
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800825 device_unlock(dev);
Stefan Richteraed80892009-01-17 22:45:54 +0100826 }
827
828 return 0;
829}
830
831static void fw_device_update(struct work_struct *work)
832{
833 struct fw_device *device =
834 container_of(work, struct fw_device, work.work);
835
836 fw_device_cdev_update(device);
837 device_for_each_child(&device->device, NULL, update_unit);
838}
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100839
840/*
841 * If a device was pending for deletion because its node went away but its
842 * bus info block and root directory header matches that of a newly discovered
843 * device, revive the existing fw_device.
844 * The newly allocated fw_device becomes obsolete instead.
845 */
846static int lookup_existing_device(struct device *dev, void *data)
847{
848 struct fw_device *old = fw_device(dev);
849 struct fw_device *new = data;
850 struct fw_card *card = new->card;
851 int match = 0;
852
Stefan Richter099d5412009-06-06 18:37:25 +0200853 if (!is_fw_device(dev))
854 return 0;
855
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100856 down_read(&fw_device_rwsem); /* serialize config_rom access */
857 spin_lock_irq(&card->lock); /* serialize node access */
858
859 if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
860 atomic_cmpxchg(&old->state,
861 FW_DEVICE_GONE,
862 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
863 struct fw_node *current_node = new->node;
864 struct fw_node *obsolete_node = old->node;
865
866 new->node = obsolete_node;
867 new->node->data = new;
868 old->node = current_node;
869 old->node->data = old;
870
871 old->max_speed = new->max_speed;
872 old->node_id = current_node->node_id;
873 smp_wmb(); /* update node_id before generation */
874 old->generation = card->generation;
875 old->config_rom_retries = 0;
876 fw_notify("rediscovered device %s\n", dev_name(dev));
877
878 PREPARE_DELAYED_WORK(&old->work, fw_device_update);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200879 fw_schedule_device_work(old, 0);
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100880
881 if (current_node == card->root_node)
882 fw_schedule_bm_work(card, 0);
883
884 match = 1;
885 }
886
887 spin_unlock_irq(&card->lock);
888 up_read(&fw_device_rwsem);
889
890 return match;
891}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500892
Stefan Richter7889b602009-03-10 21:09:28 +0100893enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, };
894
Stefan Richter099d5412009-06-06 18:37:25 +0200895static void set_broadcast_channel(struct fw_device *device, int generation)
Stefan Richter7889b602009-03-10 21:09:28 +0100896{
897 struct fw_card *card = device->card;
898 __be32 data;
899 int rcode;
900
901 if (!card->broadcast_channel_allocated)
902 return;
903
Stefan Richter837ec782009-06-09 23:56:55 +0200904 /*
905 * The Broadcast_Channel Valid bit is required by nodes which want to
906 * transmit on this channel. Such transmissions are practically
907 * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required
908 * to be IRM capable and have a max_rec of 8 or more. We use this fact
909 * to narrow down to which nodes we send Broadcast_Channel updates.
910 */
911 if (!device->irmc || device->max_rec < 8)
912 return;
913
914 /*
915 * Some 1394-1995 nodes crash if this 1394a-2000 register is written.
916 * Perform a read test first.
917 */
Stefan Richter7889b602009-03-10 21:09:28 +0100918 if (device->bc_implemented == BC_UNKNOWN) {
919 rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
920 device->node_id, generation, device->max_speed,
921 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
922 &data, 4);
923 switch (rcode) {
924 case RCODE_COMPLETE:
925 if (data & cpu_to_be32(1 << 31)) {
926 device->bc_implemented = BC_IMPLEMENTED;
927 break;
928 }
929 /* else fall through to case address error */
930 case RCODE_ADDRESS_ERROR:
931 device->bc_implemented = BC_UNIMPLEMENTED;
932 }
933 }
934
935 if (device->bc_implemented == BC_IMPLEMENTED) {
936 data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
937 BROADCAST_CHANNEL_VALID);
938 fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
939 device->node_id, generation, device->max_speed,
940 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
941 &data, 4);
942 }
943}
944
Stefan Richter099d5412009-06-06 18:37:25 +0200945int fw_device_set_broadcast_channel(struct device *dev, void *gen)
946{
947 if (is_fw_device(dev))
948 set_broadcast_channel(fw_device(dev), (long)gen);
949
950 return 0;
951}
952
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500953static void fw_device_init(struct work_struct *work)
954{
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500955 struct fw_device *device =
956 container_of(work, struct fw_device, work.work);
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100957 struct device *revived_dev;
Stefan Richtere1eff7a2009-02-03 17:55:19 +0100958 int minor, ret;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500959
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400960 /*
961 * All failure paths here set node->data to NULL, so that we
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500962 * don't try to do device_for_each_child() on a kfree()'d
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400963 * device.
964 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500965
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100966 if (read_config_rom(device, device->generation) < 0) {
Stefan Richter855c6032008-02-27 22:14:27 +0100967 if (device->config_rom_retries < MAX_RETRIES &&
968 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500969 device->config_rom_retries++;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200970 fw_schedule_device_work(device, RETRY_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500971 } else {
Stefan Richter115881d2011-03-15 00:08:41 +0100972 if (device->node->link_on)
973 fw_notify("giving up on config rom for node id %x\n",
974 device->node_id);
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500975 if (device->node == device->card->root_node)
Jay Fenlason0fa1986f2008-11-29 17:44:57 +0100976 fw_schedule_bm_work(device->card, 0);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500977 fw_device_release(&device->device);
978 }
979 return;
980 }
981
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100982 revived_dev = device_find_child(device->card->device,
983 device, lookup_existing_device);
984 if (revived_dev) {
985 put_device(revived_dev);
986 fw_device_release(&device->device);
987
988 return;
989 }
990
Stefan Richter62305822009-01-09 20:49:37 +0100991 device_initialize(&device->device);
Stefan Richter96b19062008-02-02 15:01:09 +0100992
993 fw_device_get(device);
Stefan Richterc9755e12008-03-24 20:54:28 +0100994 down_write(&fw_device_rwsem);
Stefan Richtere1eff7a2009-02-03 17:55:19 +0100995 ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ?
Stefan Richter62305822009-01-09 20:49:37 +0100996 idr_get_new(&fw_device_idr, device, &minor) :
997 -ENOMEM;
Stefan Richterc9755e12008-03-24 20:54:28 +0100998 up_write(&fw_device_rwsem);
Stefan Richter96b19062008-02-02 15:01:09 +0100999
Stefan Richtere1eff7a2009-02-03 17:55:19 +01001000 if (ret < 0)
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001001 goto error;
1002
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001003 device->device.bus = &fw_bus_type;
Kristian Høgsberg21351db2007-03-20 20:58:33 -04001004 device->device.type = &fw_device_type;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001005 device->device.parent = device->card->device;
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001006 device->device.devt = MKDEV(fw_cdev_major, minor);
Kay Sieversa1f64812008-10-30 01:41:56 +01001007 dev_set_name(&device->device, "fw%d", minor);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001008
Stefan Richtere5333db2009-05-22 23:16:27 +02001009 BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
1010 ARRAY_SIZE(fw_device_attributes) +
1011 ARRAY_SIZE(config_rom_attributes));
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -04001012 init_fw_attribute_group(&device->device,
1013 fw_device_attributes,
1014 &device->attribute_group);
Stefan Richtere5333db2009-05-22 23:16:27 +02001015
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001016 if (device_add(&device->device)) {
1017 fw_error("Failed to add device.\n");
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001018 goto error_with_cdev;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001019 }
1020
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001021 create_units(device);
1022
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001023 /*
1024 * Transition the device to running state. If it got pulled
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001025 * out from under us while we did the intialization work, we
1026 * have to shut down the device again here. Normally, though,
1027 * fw_node_event will be responsible for shutting it down when
1028 * necessary. We have to use the atomic cmpxchg here to avoid
1029 * racing with the FW_NODE_DESTROYED case in
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001030 * fw_node_event().
1031 */
Stefan Richter641f8792007-01-27 10:34:55 +01001032 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001033 FW_DEVICE_INITIALIZING,
1034 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
1035 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001036 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richterfa6e6972008-02-03 23:03:00 +01001037 } else {
1038 if (device->config_rom_retries)
1039 fw_notify("created device %s: GUID %08x%08x, S%d00, "
1040 "%d config ROM retries\n",
Kay Sieversa1f64812008-10-30 01:41:56 +01001041 dev_name(&device->device),
Stefan Richterfa6e6972008-02-03 23:03:00 +01001042 device->config_rom[3], device->config_rom[4],
1043 1 << device->max_speed,
1044 device->config_rom_retries);
1045 else
1046 fw_notify("created device %s: GUID %08x%08x, S%d00\n",
Kay Sieversa1f64812008-10-30 01:41:56 +01001047 dev_name(&device->device),
Stefan Richterfa6e6972008-02-03 23:03:00 +01001048 device->config_rom[3], device->config_rom[4],
1049 1 << device->max_speed);
Stefan Richterc9755e12008-03-24 20:54:28 +01001050 device->config_rom_retries = 0;
Stefan Richter7889b602009-03-10 21:09:28 +01001051
Stefan Richter099d5412009-06-06 18:37:25 +02001052 set_broadcast_channel(device, device->generation);
Stefan Richterfa6e6972008-02-03 23:03:00 +01001053 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001054
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001055 /*
1056 * Reschedule the IRM work if we just finished reading the
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001057 * root node config rom. If this races with a bus reset we
1058 * just end up running the IRM work a couple of extra times -
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001059 * pretty harmless.
1060 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001061 if (device->node == device->card->root_node)
Jay Fenlason0fa1986f2008-11-29 17:44:57 +01001062 fw_schedule_bm_work(device->card, 0);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001063
1064 return;
1065
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001066 error_with_cdev:
Stefan Richterc9755e12008-03-24 20:54:28 +01001067 down_write(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001068 idr_remove(&fw_device_idr, minor);
Stefan Richterc9755e12008-03-24 20:54:28 +01001069 up_write(&fw_device_rwsem);
Stefan Richter373b2ed2007-03-04 14:45:18 +01001070 error:
Stefan Richter96b19062008-02-02 15:01:09 +01001071 fw_device_put(device); /* fw_device_idr's reference */
1072
1073 put_device(&device->device); /* our reference */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001074}
1075
Stefan Richterc9755e12008-03-24 20:54:28 +01001076enum {
1077 REREAD_BIB_ERROR,
1078 REREAD_BIB_GONE,
1079 REREAD_BIB_UNCHANGED,
1080 REREAD_BIB_CHANGED,
1081};
1082
1083/* Reread and compare bus info block and header of root directory */
Stefan Richterfd6e0c512010-02-19 21:00:31 +01001084static int reread_config_rom(struct fw_device *device, int generation)
Stefan Richterc9755e12008-03-24 20:54:28 +01001085{
1086 u32 q;
1087 int i;
1088
1089 for (i = 0; i < 6; i++) {
1090 if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
1091 return REREAD_BIB_ERROR;
1092
1093 if (i == 0 && q == 0)
1094 return REREAD_BIB_GONE;
1095
Stefan Richterd01b0172009-01-17 22:45:54 +01001096 if (q != device->config_rom[i])
Stefan Richterc9755e12008-03-24 20:54:28 +01001097 return REREAD_BIB_CHANGED;
1098 }
1099
1100 return REREAD_BIB_UNCHANGED;
1101}
1102
1103static void fw_device_refresh(struct work_struct *work)
1104{
1105 struct fw_device *device =
1106 container_of(work, struct fw_device, work.work);
1107 struct fw_card *card = device->card;
1108 int node_id = device->node_id;
1109
Stefan Richterfd6e0c512010-02-19 21:00:31 +01001110 switch (reread_config_rom(device, device->generation)) {
Stefan Richterc9755e12008-03-24 20:54:28 +01001111 case REREAD_BIB_ERROR:
1112 if (device->config_rom_retries < MAX_RETRIES / 2 &&
1113 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1114 device->config_rom_retries++;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001115 fw_schedule_device_work(device, RETRY_DELAY / 2);
Stefan Richterc9755e12008-03-24 20:54:28 +01001116
1117 return;
1118 }
1119 goto give_up;
1120
1121 case REREAD_BIB_GONE:
1122 goto gone;
1123
1124 case REREAD_BIB_UNCHANGED:
1125 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001126 FW_DEVICE_INITIALIZING,
1127 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
Stefan Richterc9755e12008-03-24 20:54:28 +01001128 goto gone;
1129
1130 fw_device_update(work);
1131 device->config_rom_retries = 0;
1132 goto out;
1133
1134 case REREAD_BIB_CHANGED:
1135 break;
1136 }
1137
1138 /*
1139 * Something changed. We keep things simple and don't investigate
1140 * further. We just destroy all previous units and create new ones.
1141 */
1142 device_for_each_child(&device->device, NULL, shutdown_unit);
1143
Stefan Richterfd6e0c512010-02-19 21:00:31 +01001144 if (read_config_rom(device, device->generation) < 0) {
Stefan Richterc9755e12008-03-24 20:54:28 +01001145 if (device->config_rom_retries < MAX_RETRIES &&
1146 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1147 device->config_rom_retries++;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001148 fw_schedule_device_work(device, RETRY_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001149
1150 return;
1151 }
1152 goto give_up;
1153 }
1154
Stefan Richter8b4f70b2010-07-07 15:36:07 +02001155 fw_device_cdev_update(device);
Stefan Richterc9755e12008-03-24 20:54:28 +01001156 create_units(device);
1157
Stefan Richter0210b662009-05-23 00:03:29 +02001158 /* Userspace may want to re-read attributes. */
1159 kobject_uevent(&device->device.kobj, KOBJ_CHANGE);
1160
Stefan Richterc9755e12008-03-24 20:54:28 +01001161 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001162 FW_DEVICE_INITIALIZING,
1163 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
Stefan Richterc9755e12008-03-24 20:54:28 +01001164 goto gone;
1165
Kay Sieversa1f64812008-10-30 01:41:56 +01001166 fw_notify("refreshed device %s\n", dev_name(&device->device));
Stefan Richterc9755e12008-03-24 20:54:28 +01001167 device->config_rom_retries = 0;
1168 goto out;
1169
1170 give_up:
Kay Sieversa1f64812008-10-30 01:41:56 +01001171 fw_notify("giving up on refresh of device %s\n", dev_name(&device->device));
Stefan Richterc9755e12008-03-24 20:54:28 +01001172 gone:
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001173 atomic_set(&device->state, FW_DEVICE_GONE);
1174 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001175 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001176 out:
1177 if (node_id == card->root_node->node_id)
Jay Fenlason0fa1986f2008-11-29 17:44:57 +01001178 fw_schedule_bm_work(card, 0);
Stefan Richterc9755e12008-03-24 20:54:28 +01001179}
1180
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001181void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
1182{
1183 struct fw_device *device;
1184
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001185 switch (event) {
1186 case FW_NODE_CREATED:
Stefan Richter115881d2011-03-15 00:08:41 +01001187 /*
1188 * Attempt to scan the node, regardless whether its self ID has
1189 * the L (link active) flag set or not. Some broken devices
1190 * send L=0 but have an up-and-running link; others send L=1
1191 * without actually having a link.
1192 */
Stefan Richterc9755e12008-03-24 20:54:28 +01001193 create:
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001194 device = kzalloc(sizeof(*device), GFP_ATOMIC);
1195 if (device == NULL)
1196 break;
1197
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001198 /*
1199 * Do minimal intialization of the device here, the
Stefan Richter62305822009-01-09 20:49:37 +01001200 * rest will happen in fw_device_init().
1201 *
1202 * Attention: A lot of things, even fw_device_get(),
1203 * cannot be done before fw_device_init() finished!
1204 * You can basically just check device->state and
1205 * schedule work until then, but only while holding
1206 * card->lock.
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001207 */
Stefan Richter641f8792007-01-27 10:34:55 +01001208 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
Stefan Richter459f7922008-05-24 16:50:22 +02001209 device->card = fw_card_get(card);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001210 device->node = fw_node_get(node);
1211 device->node_id = node->node_id;
1212 device->generation = card->generation;
Stefan Richter92368892009-05-13 21:42:14 +02001213 device->is_local = node == card->local_node;
Stefan Richterd67cfb92008-10-05 10:37:11 +02001214 mutex_init(&device->client_list_mutex);
Kristian Høgsberg97bd9ef2007-03-07 12:12:41 -05001215 INIT_LIST_HEAD(&device->client_list);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001216
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001217 /*
1218 * Set the node data to point back to this device so
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001219 * FW_NODE_UPDATED callbacks can update the node_id
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001220 * and generation for the device.
1221 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001222 node->data = device;
1223
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001224 /*
1225 * Many devices are slow to respond after bus resets,
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001226 * especially if they are bus powered and go through
1227 * power-up after getting plugged in. We schedule the
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001228 * first config rom scan half a second after bus reset.
1229 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001230 INIT_DELAYED_WORK(&device->work, fw_device_init);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001231 fw_schedule_device_work(device, INITIAL_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001232 break;
1233
Stefan Richterc9755e12008-03-24 20:54:28 +01001234 case FW_NODE_INITIATED_RESET:
Stefan Richter115881d2011-03-15 00:08:41 +01001235 case FW_NODE_LINK_ON:
Stefan Richterc9755e12008-03-24 20:54:28 +01001236 device = node->data;
1237 if (device == NULL)
1238 goto create;
1239
1240 device->node_id = node->node_id;
1241 smp_wmb(); /* update node_id before generation */
1242 device->generation = card->generation;
1243 if (atomic_cmpxchg(&device->state,
1244 FW_DEVICE_RUNNING,
1245 FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
1246 PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001247 fw_schedule_device_work(device,
Stefan Richter92368892009-05-13 21:42:14 +02001248 device->is_local ? 0 : INITIAL_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001249 }
1250 break;
1251
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001252 case FW_NODE_UPDATED:
Stefan Richter115881d2011-03-15 00:08:41 +01001253 device = node->data;
1254 if (device == NULL)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001255 break;
1256
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001257 device->node_id = node->node_id;
Stefan Richterb5d2a5e2008-01-25 18:57:41 +01001258 smp_wmb(); /* update node_id before generation */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001259 device->generation = card->generation;
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001260 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
1261 PREPARE_DELAYED_WORK(&device->work, fw_device_update);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001262 fw_schedule_device_work(device, 0);
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001263 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001264 break;
1265
1266 case FW_NODE_DESTROYED:
1267 case FW_NODE_LINK_OFF:
1268 if (!node->data)
1269 break;
1270
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001271 /*
1272 * Destroy the device associated with the node. There
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001273 * are two cases here: either the device is fully
1274 * initialized (FW_DEVICE_RUNNING) or we're in the
1275 * process of reading its config rom
1276 * (FW_DEVICE_INITIALIZING). If it is fully
1277 * initialized we can reuse device->work to schedule a
1278 * full fw_device_shutdown(). If not, there's work
1279 * scheduled to read it's config rom, and we just put
1280 * the device in shutdown state to have that code fail
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001281 * to create the device.
1282 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001283 device = node->data;
Stefan Richter641f8792007-01-27 10:34:55 +01001284 if (atomic_xchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001285 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001286 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001287 fw_schedule_device_work(device,
Stefan Richtere747a5c2009-01-24 20:35:38 +01001288 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001289 }
1290 break;
1291 }
1292}