blob: 68109e9bb04e4395bdbeadc02e0edfa9229074a8 [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 Sharma60063492011-07-26 16:09:06 -070041#include <linux/atomic.h>
Stefan Richtere8ca9702009-06-04 21:09:38 +020042#include <asm/byteorder.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010043
Stefan Richter77c9a5d2009-06-05 16:26:18 +020044#include "core.h"
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050045
Stefan Richter13b302d2009-12-26 01:44:10 +010046void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050047{
48 ci->p = p + 1;
49 ci->end = ci->p + (p[0] >> 16);
50}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050051EXPORT_SYMBOL(fw_csr_iterator_init);
52
53int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
54{
55 *key = *ci->p >> 24;
56 *value = *ci->p & 0xffffff;
57
58 return ci->p++ < ci->end;
59}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050060EXPORT_SYMBOL(fw_csr_iterator_next);
61
Stefan Richter13b302d2009-12-26 01:44:10 +010062static const u32 *search_leaf(const u32 *directory, int search_key)
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010063{
64 struct fw_csr_iterator ci;
65 int last_key = 0, key, value;
66
67 fw_csr_iterator_init(&ci, directory);
68 while (fw_csr_iterator_next(&ci, &key, &value)) {
69 if (last_key == search_key &&
70 key == (CSR_DESCRIPTOR | CSR_LEAF))
71 return ci.p - 1 + value;
Stefan Richter3c2c58c2009-12-26 01:43:21 +010072
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010073 last_key = key;
74 }
Stefan Richter3c2c58c2009-12-26 01:43:21 +010075
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010076 return NULL;
77}
78
Stefan Richter13b302d2009-12-26 01:44:10 +010079static int textual_leaf_to_string(const u32 *block, char *buf, size_t size)
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010080{
Stefan Richter3c2c58c2009-12-26 01:43:21 +010081 unsigned int quadlets, i;
82 char c;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010083
84 if (!size || !buf)
85 return -EINVAL;
86
Stefan Richter3c2c58c2009-12-26 01:43:21 +010087 quadlets = min(block[0] >> 16, 256U);
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010088 if (quadlets < 2)
89 return -ENODATA;
90
91 if (block[1] != 0 || block[2] != 0)
92 /* unknown language/character set */
93 return -ENODATA;
94
95 block += 3;
96 quadlets -= 2;
Stefan Richter3c2c58c2009-12-26 01:43:21 +010097 for (i = 0; i < quadlets * 4 && i < size - 1; i++) {
98 c = block[i / 4] >> (24 - 8 * (i % 4));
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010099 if (c == '\0')
100 break;
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100101 buf[i] = c;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100102 }
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100103 buf[i] = '\0';
104
105 return i;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100106}
107
108/**
Stefan Richter656b7af2010-07-07 13:26:18 +0200109 * fw_csr_string() - reads a string from the configuration ROM
110 * @directory: e.g. root directory or unit directory
111 * @key: the key of the preceding directory entry
112 * @buf: where to put the string
113 * @size: size of @buf, in bytes
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100114 *
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100115 * The string is taken from a minimal ASCII text descriptor leaf after
116 * the immediate entry with @key. The string is zero-terminated.
117 * Returns strlen(buf) or a negative error code.
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100118 */
Stefan Richter13b302d2009-12-26 01:44:10 +0100119int fw_csr_string(const u32 *directory, int key, char *buf, size_t size)
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100120{
Stefan Richter13b302d2009-12-26 01:44:10 +0100121 const u32 *leaf = search_leaf(directory, key);
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100122 if (!leaf)
123 return -ENOENT;
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100124
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100125 return textual_leaf_to_string(leaf, buf, size);
126}
127EXPORT_SYMBOL(fw_csr_string);
128
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100129static void get_ids(const u32 *directory, int *id)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500130{
131 struct fw_csr_iterator ci;
Stefan Richter5ae73512010-03-19 00:38:29 +0100132 int key, value;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500133
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500134 fw_csr_iterator_init(&ci, directory);
135 while (fw_csr_iterator_next(&ci, &key, &value)) {
Stefan Richter5ae73512010-03-19 00:38:29 +0100136 switch (key) {
137 case CSR_VENDOR: id[0] = value; break;
138 case CSR_MODEL: id[1] = value; break;
139 case CSR_SPECIFIER_ID: id[2] = value; break;
140 case CSR_VERSION: id[3] = value; break;
141 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500142 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500143}
144
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100145static void get_modalias_ids(struct fw_unit *unit, int *id)
146{
147 get_ids(&fw_parent_device(unit)->config_rom[5], id);
148 get_ids(unit->directory, id);
149}
150
151static bool match_ids(const struct ieee1394_device_id *id_table, int *id)
152{
153 int match = 0;
154
155 if (id[0] == id_table->vendor_id)
156 match |= IEEE1394_MATCH_VENDOR_ID;
157 if (id[1] == id_table->model_id)
158 match |= IEEE1394_MATCH_MODEL_ID;
159 if (id[2] == id_table->specifier_id)
160 match |= IEEE1394_MATCH_SPECIFIER_ID;
161 if (id[3] == id_table->version)
162 match |= IEEE1394_MATCH_VERSION;
163
164 return (match & id_table->match_flags) == id_table->match_flags;
165}
166
167static bool is_fw_unit(struct device *dev);
168
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500169static int fw_unit_match(struct device *dev, struct device_driver *drv)
170{
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100171 const struct ieee1394_device_id *id_table =
172 container_of(drv, struct fw_driver, driver)->id_table;
173 int id[] = {0, 0, 0, 0};
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500174
175 /* We only allow binding to fw_units. */
176 if (!is_fw_unit(dev))
177 return 0;
178
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100179 get_modalias_ids(fw_unit(dev), id);
Stefan Richtere41f8d72009-02-16 00:22:05 +0100180
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100181 for (; id_table->match_flags != 0; id_table++)
182 if (match_ids(id_table, id))
Stefan Richtere41f8d72009-02-16 00:22:05 +0100183 return 1;
184
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500185 return 0;
186}
187
188static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
189{
Stefan Richter5ae73512010-03-19 00:38:29 +0100190 int id[] = {0, 0, 0, 0};
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500191
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100192 get_modalias_ids(unit, id);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500193
194 return snprintf(buffer, buffer_size,
195 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
Stefan Richter5ae73512010-03-19 00:38:29 +0100196 id[0], id[1], id[2], id[3]);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500197}
198
Stefan Richter53dca512008-12-14 21:47:04 +0100199static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500200{
201 struct fw_unit *unit = fw_unit(dev);
202 char modalias[64];
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500203
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400204 get_modalias(unit, modalias, sizeof(modalias));
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500205
Kay Sievers7eff2e72007-08-14 15:15:12 +0200206 if (add_uevent_var(env, "MODALIAS=%s", modalias))
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500207 return -ENOMEM;
208
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500209 return 0;
210}
211
212struct bus_type fw_bus_type = {
Kristian Høgsberg362c2c82007-02-06 14:49:37 -0500213 .name = "firewire",
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500214 .match = fw_unit_match,
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500215};
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500216EXPORT_SYMBOL(fw_bus_type);
217
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500218int fw_device_enable_phys_dma(struct fw_device *device)
219{
Stefan Richterb5d2a5e2008-01-25 18:57:41 +0100220 int generation = device->generation;
221
222 /* device->node_id, accessed below, must not be older than generation */
223 smp_rmb();
224
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500225 return device->card->driver->enable_phys_dma(device->card,
226 device->node_id,
Stefan Richterb5d2a5e2008-01-25 18:57:41 +0100227 generation);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500228}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500229EXPORT_SYMBOL(fw_device_enable_phys_dma);
230
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400231struct config_rom_attribute {
232 struct device_attribute attr;
233 u32 key;
234};
235
Stefan Richter53dca512008-12-14 21:47:04 +0100236static ssize_t show_immediate(struct device *dev,
237 struct device_attribute *dattr, char *buf)
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400238{
239 struct config_rom_attribute *attr =
240 container_of(dattr, struct config_rom_attribute, attr);
241 struct fw_csr_iterator ci;
Stefan Richter13b302d2009-12-26 01:44:10 +0100242 const u32 *dir;
Stefan Richterc9755e12008-03-24 20:54:28 +0100243 int key, value, ret = -ENOENT;
244
245 down_read(&fw_device_rwsem);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400246
247 if (is_fw_unit(dev))
248 dir = fw_unit(dev)->directory;
249 else
250 dir = fw_device(dev)->config_rom + 5;
251
252 fw_csr_iterator_init(&ci, dir);
253 while (fw_csr_iterator_next(&ci, &key, &value))
Stefan Richterc9755e12008-03-24 20:54:28 +0100254 if (attr->key == key) {
255 ret = snprintf(buf, buf ? PAGE_SIZE : 0,
256 "0x%06x\n", value);
257 break;
258 }
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400259
Stefan Richterc9755e12008-03-24 20:54:28 +0100260 up_read(&fw_device_rwsem);
261
262 return ret;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400263}
264
265#define IMMEDIATE_ATTR(name, key) \
266 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
267
Stefan Richter53dca512008-12-14 21:47:04 +0100268static ssize_t show_text_leaf(struct device *dev,
269 struct device_attribute *dattr, char *buf)
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400270{
271 struct config_rom_attribute *attr =
272 container_of(dattr, struct config_rom_attribute, attr);
Stefan Richter13b302d2009-12-26 01:44:10 +0100273 const u32 *dir;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100274 size_t bufsize;
275 char dummy_buf[2];
276 int ret;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400277
Stefan Richterc9755e12008-03-24 20:54:28 +0100278 down_read(&fw_device_rwsem);
279
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400280 if (is_fw_unit(dev))
281 dir = fw_unit(dev)->directory;
282 else
283 dir = fw_device(dev)->config_rom + 5;
284
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100285 if (buf) {
286 bufsize = PAGE_SIZE - 1;
287 } else {
288 buf = dummy_buf;
289 bufsize = 1;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400290 }
291
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100292 ret = fw_csr_string(dir, attr->key, buf, bufsize);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400293
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100294 if (ret >= 0) {
295 /* Strip trailing whitespace and add newline. */
296 while (ret > 0 && isspace(buf[ret - 1]))
297 ret--;
298 strcpy(buf + ret, "\n");
299 ret++;
Stefan Richterc9755e12008-03-24 20:54:28 +0100300 }
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400301
Stefan Richterc9755e12008-03-24 20:54:28 +0100302 up_read(&fw_device_rwsem);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400303
Stefan Richterc9755e12008-03-24 20:54:28 +0100304 return ret;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400305}
306
307#define TEXT_LEAF_ATTR(name, key) \
308 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
309
310static struct config_rom_attribute config_rom_attributes[] = {
311 IMMEDIATE_ATTR(vendor, CSR_VENDOR),
312 IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
313 IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
314 IMMEDIATE_ATTR(version, CSR_VERSION),
315 IMMEDIATE_ATTR(model, CSR_MODEL),
316 TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
317 TEXT_LEAF_ATTR(model_name, CSR_MODEL),
318 TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
319};
320
Stefan Richter53dca512008-12-14 21:47:04 +0100321static void init_fw_attribute_group(struct device *dev,
322 struct device_attribute *attrs,
323 struct fw_attribute_group *group)
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400324{
325 struct device_attribute *attr;
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400326 int i, j;
327
328 for (j = 0; attrs[j].attr.name != NULL; j++)
329 group->attrs[j] = &attrs[j].attr;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400330
331 for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
332 attr = &config_rom_attributes[i].attr;
333 if (attr->show(dev, attr, NULL) < 0)
334 continue;
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400335 group->attrs[j++] = &attr->attr;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400336 }
337
Stefan Richtere5333db2009-05-22 23:16:27 +0200338 group->attrs[j] = NULL;
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400339 group->groups[0] = &group->group;
340 group->groups[1] = NULL;
341 group->group.attrs = group->attrs;
David Brownella4dbd672009-06-24 10:06:31 -0700342 dev->groups = (const struct attribute_group **) group->groups;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400343}
344
Stefan Richter53dca512008-12-14 21:47:04 +0100345static ssize_t modalias_show(struct device *dev,
346 struct device_attribute *attr, char *buf)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500347{
348 struct fw_unit *unit = fw_unit(dev);
349 int length;
350
351 length = get_modalias(unit, buf, PAGE_SIZE);
352 strcpy(buf + length, "\n");
353
354 return length + 1;
355}
356
Stefan Richter53dca512008-12-14 21:47:04 +0100357static ssize_t rom_index_show(struct device *dev,
358 struct device_attribute *attr, char *buf)
Kristian Høgsberg048961e2007-03-07 12:12:46 -0500359{
360 struct fw_device *device = fw_device(dev->parent);
361 struct fw_unit *unit = fw_unit(dev);
362
363 return snprintf(buf, PAGE_SIZE, "%d\n",
Stefan Richterd84702a2007-03-20 19:42:15 +0100364 (int)(unit->directory - device->config_rom));
Kristian Høgsberg048961e2007-03-07 12:12:46 -0500365}
366
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400367static struct device_attribute fw_unit_attributes[] = {
368 __ATTR_RO(modalias),
369 __ATTR_RO(rom_index),
370 __ATTR_NULL,
371};
372
Stefan Richter53dca512008-12-14 21:47:04 +0100373static ssize_t config_rom_show(struct device *dev,
374 struct device_attribute *attr, char *buf)
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400375{
376 struct fw_device *device = fw_device(dev);
Stefan Richterc9755e12008-03-24 20:54:28 +0100377 size_t length;
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400378
Stefan Richterc9755e12008-03-24 20:54:28 +0100379 down_read(&fw_device_rwsem);
380 length = device->config_rom_length * 4;
381 memcpy(buf, device->config_rom, length);
382 up_read(&fw_device_rwsem);
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400383
Stefan Richterc9755e12008-03-24 20:54:28 +0100384 return length;
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400385}
386
Stefan Richter53dca512008-12-14 21:47:04 +0100387static ssize_t guid_show(struct device *dev,
388 struct device_attribute *attr, char *buf)
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400389{
390 struct fw_device *device = fw_device(dev);
Stefan Richterc9755e12008-03-24 20:54:28 +0100391 int ret;
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400392
Stefan Richterc9755e12008-03-24 20:54:28 +0100393 down_read(&fw_device_rwsem);
394 ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
395 device->config_rom[3], device->config_rom[4]);
396 up_read(&fw_device_rwsem);
397
398 return ret;
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400399}
400
Stefan Richter13b302d2009-12-26 01:44:10 +0100401static int units_sprintf(char *buf, const u32 *directory)
Stefan Richter0210b662009-05-23 00:03:29 +0200402{
403 struct fw_csr_iterator ci;
404 int key, value;
405 int specifier_id = 0;
406 int version = 0;
407
408 fw_csr_iterator_init(&ci, directory);
409 while (fw_csr_iterator_next(&ci, &key, &value)) {
410 switch (key) {
411 case CSR_SPECIFIER_ID:
412 specifier_id = value;
413 break;
414 case CSR_VERSION:
415 version = value;
416 break;
417 }
418 }
419
420 return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version);
421}
422
423static ssize_t units_show(struct device *dev,
424 struct device_attribute *attr, char *buf)
425{
426 struct fw_device *device = fw_device(dev);
427 struct fw_csr_iterator ci;
428 int key, value, i = 0;
429
430 down_read(&fw_device_rwsem);
431 fw_csr_iterator_init(&ci, &device->config_rom[5]);
432 while (fw_csr_iterator_next(&ci, &key, &value)) {
433 if (key != (CSR_UNIT | CSR_DIRECTORY))
434 continue;
435 i += units_sprintf(&buf[i], ci.p + value - 1);
436 if (i >= PAGE_SIZE - (8 + 1 + 8 + 1))
437 break;
438 }
439 up_read(&fw_device_rwsem);
440
441 if (i)
442 buf[i - 1] = '\n';
443
444 return i;
445}
446
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400447static struct device_attribute fw_device_attributes[] = {
448 __ATTR_RO(config_rom),
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400449 __ATTR_RO(guid),
Stefan Richter0210b662009-05-23 00:03:29 +0200450 __ATTR_RO(units),
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400451 __ATTR_NULL,
Kristian Høgsberg048961e2007-03-07 12:12:46 -0500452};
453
Stefan Richter53dca512008-12-14 21:47:04 +0100454static int read_rom(struct fw_device *device,
455 int generation, int index, u32 *data)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500456{
Stefan Richteraaff1202011-08-07 15:20:18 +0200457 u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4;
458 int i, rcode;
Stefan Richterb5d2a5e2008-01-25 18:57:41 +0100459
460 /* device->node_id, accessed below, must not be older than generation */
461 smp_rmb();
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500462
Stefan Richteraaff1202011-08-07 15:20:18 +0200463 for (i = 10; i < 100; i += 10) {
464 rcode = fw_run_transaction(device->card,
465 TCODE_READ_QUADLET_REQUEST, device->node_id,
466 generation, device->max_speed, offset, data, 4);
467 if (rcode != RCODE_BUSY)
468 break;
469 msleep(i);
470 }
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200471 be32_to_cpus(data);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500472
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200473 return rcode;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500474}
475
Stefan Richterfd6e0c52010-02-19 21:00:31 +0100476#define MAX_CONFIG_ROM_SIZE 256
Stefan Richter1dadff72008-03-02 19:35:42 +0100477
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100478/*
479 * Read the bus info block, perform a speed probe, and read all of the rest of
480 * the config ROM. We do all this with a cached bus generation. If the bus
Stefan Richterfd6e0c52010-02-19 21:00:31 +0100481 * generation changes under us, read_config_rom will fail and get retried.
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100482 * It's better to start all over in this case because the node from which we
483 * are reading the ROM may have changed the ROM during the reset.
484 */
Stefan Richterfd6e0c52010-02-19 21:00:31 +0100485static int read_config_rom(struct fw_device *device, int generation)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500486{
Stefan Richter26b49502012-02-18 22:03:14 +0100487 struct fw_card *card = device->card;
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 Richterfd6e0c52010-02-19 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 Richterfd6e0c52010-02-19 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 ||
Stefan Richter26b49502012-02-18 22:03:14 +0100532 card->beta_repeaters_present) {
Stefan Richterf1397492007-06-10 21:31:36 +0200533 u32 dummy;
534
535 /* for S1600 and S3200 */
536 if (device->max_speed == SCODE_BETA)
Stefan Richter26b49502012-02-18 22:03:14 +0100537 device->max_speed = card->link_speed;
Stefan Richterf1397492007-06-10 21:31:36 +0200538
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 Richterfd6e0c52010-02-19 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 Richterfd6e0c52010-02-19 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 Richter26b49502012-02-18 22:03:14 +0100579 fw_err(card, "skipped invalid ROM block %x at %llx\n",
580 rom[i],
581 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
Stefan Richter2799d5c2010-02-18 01:52:45 +0100582 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 Richterfd6e0c52010-02-19 21:00:31 +0100606 if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) {
Stefan Richter26b49502012-02-18 22:03:14 +0100607 fw_err(card,
608 "skipped unsupported ROM entry %x at %llx\n",
609 rom[i],
610 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
Stefan Richterd54423c2010-02-18 01:50:31 +0100611 rom[i] = 0;
612 continue;
613 }
614 stack[sp++] = i + rom[i];
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500615 }
616 if (length < i)
617 length = i;
618 }
619
Stefan Richterc9755e12008-03-24 20:54:28 +0100620 old_rom = device->config_rom;
621 new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
622 if (new_rom == NULL)
Stefan Richter1dadff72008-03-02 19:35:42 +0100623 goto out;
Stefan Richterc9755e12008-03-24 20:54:28 +0100624
625 down_write(&fw_device_rwsem);
626 device->config_rom = new_rom;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500627 device->config_rom_length = length;
Stefan Richterc9755e12008-03-24 20:54:28 +0100628 up_write(&fw_device_rwsem);
629
630 kfree(old_rom);
Stefan Richter1dadff72008-03-02 19:35:42 +0100631 ret = 0;
Stefan Richter837ec782009-06-09 23:56:55 +0200632 device->max_rec = rom[2] >> 12 & 0xf;
633 device->cmc = rom[2] >> 30 & 1;
634 device->irmc = rom[2] >> 31 & 1;
Stefan Richter1dadff72008-03-02 19:35:42 +0100635 out:
636 kfree(rom);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500637
Stefan Richter1dadff72008-03-02 19:35:42 +0100638 return ret;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500639}
640
641static void fw_unit_release(struct device *dev)
642{
643 struct fw_unit *unit = fw_unit(dev);
644
Stefan Richter21076222011-08-27 18:53:03 +0200645 fw_device_put(fw_parent_device(unit));
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500646 kfree(unit);
647}
648
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400649static struct device_type fw_unit_type = {
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400650 .uevent = fw_unit_uevent,
651 .release = fw_unit_release,
652};
653
Stefan Richter099d5412009-06-06 18:37:25 +0200654static bool is_fw_unit(struct device *dev)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500655{
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400656 return dev->type == &fw_unit_type;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500657}
658
659static void create_units(struct fw_device *device)
660{
661 struct fw_csr_iterator ci;
662 struct fw_unit *unit;
663 int key, value, i;
664
665 i = 0;
666 fw_csr_iterator_init(&ci, &device->config_rom[5]);
667 while (fw_csr_iterator_next(&ci, &key, &value)) {
668 if (key != (CSR_UNIT | CSR_DIRECTORY))
669 continue;
670
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400671 /*
672 * Get the address of the unit directory and try to
673 * match the drivers id_tables against it.
674 */
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400675 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500676 if (unit == NULL) {
Stefan Richter26b49502012-02-18 22:03:14 +0100677 fw_err(device->card, "out of memory for unit\n");
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500678 continue;
679 }
680
681 unit->directory = ci.p + value - 1;
682 unit->device.bus = &fw_bus_type;
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400683 unit->device.type = &fw_unit_type;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500684 unit->device.parent = &device->device;
Kay Sieversa1f64812008-10-30 01:41:56 +0100685 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500686
Stefan Richtere5333db2009-05-22 23:16:27 +0200687 BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
688 ARRAY_SIZE(fw_unit_attributes) +
689 ARRAY_SIZE(config_rom_attributes));
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400690 init_fw_attribute_group(&unit->device,
691 fw_unit_attributes,
692 &unit->attribute_group);
Stefan Richtere5333db2009-05-22 23:16:27 +0200693
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400694 if (device_register(&unit->device) < 0)
695 goto skip_unit;
696
Stefan Richter21076222011-08-27 18:53:03 +0200697 fw_device_get(device);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400698 continue;
699
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400700 skip_unit:
701 kfree(unit);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500702 }
703}
704
705static int shutdown_unit(struct device *device, void *data)
706{
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400707 device_unregister(device);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500708
709 return 0;
710}
711
Stefan Richterc9755e12008-03-24 20:54:28 +0100712/*
713 * fw_device_rwsem acts as dual purpose mutex:
714 * - serializes accesses to fw_device_idr,
715 * - serializes accesses to fw_device.config_rom/.config_rom_length and
716 * fw_unit.directory, unless those accesses happen at safe occasions
717 */
718DECLARE_RWSEM(fw_device_rwsem);
719
Stefan Richterd6053e02008-11-24 20:40:00 +0100720DEFINE_IDR(fw_device_idr);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500721int fw_cdev_major;
722
Stefan Richter96b19062008-02-02 15:01:09 +0100723struct fw_device *fw_device_get_by_devt(dev_t devt)
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500724{
725 struct fw_device *device;
726
Stefan Richterc9755e12008-03-24 20:54:28 +0100727 down_read(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500728 device = idr_find(&fw_device_idr, MINOR(devt));
Stefan Richter96b19062008-02-02 15:01:09 +0100729 if (device)
730 fw_device_get(device);
Stefan Richterc9755e12008-03-24 20:54:28 +0100731 up_read(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500732
733 return device;
734}
735
Stefan Richter105e53f2011-05-01 20:50:31 +0200736struct workqueue_struct *fw_workqueue;
737EXPORT_SYMBOL(fw_workqueue);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200738
739static void fw_schedule_device_work(struct fw_device *device,
740 unsigned long delay)
741{
Stefan Richter105e53f2011-05-01 20:50:31 +0200742 queue_delayed_work(fw_workqueue, &device->work, delay);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200743}
744
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400745/*
746 * These defines control the retry behavior for reading the config
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500747 * rom. It shouldn't be necessary to tweak these; if the device
748 * doesn't respond to a config rom read within 10 seconds, it's not
749 * going to respond at all. As for the initial delay, a lot of
750 * devices will be able to respond within half a second after bus
751 * reset. On the other hand, it's not really worth being more
752 * aggressive than that, since it scales pretty well; if 10 devices
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400753 * are plugged in, they're all getting read within one second.
754 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500755
Kristian Høgsbergc5dfd0a2007-03-27 01:43:43 -0400756#define MAX_RETRIES 10
757#define RETRY_DELAY (3 * HZ)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500758#define INITIAL_DELAY (HZ / 2)
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100759#define SHUTDOWN_DELAY (2 * HZ)
760
761static void fw_device_shutdown(struct work_struct *work)
762{
763 struct fw_device *device =
764 container_of(work, struct fw_device, work.work);
765 int minor = MINOR(device->device.devt);
766
Clemens Ladische71084a2011-01-22 15:05:03 +0100767 if (time_before64(get_jiffies_64(),
768 device->card->reset_jiffies + SHUTDOWN_DELAY)
Stefan Richtere747a5c2009-01-24 20:35:38 +0100769 && !list_empty(&device->card->link)) {
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200770 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100771 return;
772 }
773
774 if (atomic_cmpxchg(&device->state,
775 FW_DEVICE_GONE,
776 FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
777 return;
778
779 fw_device_cdev_remove(device);
780 device_for_each_child(&device->device, NULL, shutdown_unit);
781 device_unregister(&device->device);
782
783 down_write(&fw_device_rwsem);
784 idr_remove(&fw_device_idr, minor);
785 up_write(&fw_device_rwsem);
786
787 fw_device_put(device);
788}
789
Stefan Richteraed80892009-01-17 22:45:54 +0100790static void fw_device_release(struct device *dev)
791{
792 struct fw_device *device = fw_device(dev);
793 struct fw_card *card = device->card;
794 unsigned long flags;
795
796 /*
797 * Take the card lock so we don't set this to NULL while a
798 * FW_NODE_UPDATED callback is being handled or while the
799 * bus manager work looks at this node.
800 */
801 spin_lock_irqsave(&card->lock, flags);
802 device->node->data = NULL;
803 spin_unlock_irqrestore(&card->lock, flags);
804
805 fw_node_put(device->node);
806 kfree(device->config_rom);
807 kfree(device);
808 fw_card_put(card);
809}
810
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100811static struct device_type fw_device_type = {
Stefan Richteraed80892009-01-17 22:45:54 +0100812 .release = fw_device_release,
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100813};
814
Stefan Richter099d5412009-06-06 18:37:25 +0200815static bool is_fw_device(struct device *dev)
816{
817 return dev->type == &fw_device_type;
818}
819
Stefan Richteraed80892009-01-17 22:45:54 +0100820static int update_unit(struct device *dev, void *data)
821{
822 struct fw_unit *unit = fw_unit(dev);
823 struct fw_driver *driver = (struct fw_driver *)dev->driver;
824
825 if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800826 device_lock(dev);
Stefan Richteraed80892009-01-17 22:45:54 +0100827 driver->update(unit);
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800828 device_unlock(dev);
Stefan Richteraed80892009-01-17 22:45:54 +0100829 }
830
831 return 0;
832}
833
834static void fw_device_update(struct work_struct *work)
835{
836 struct fw_device *device =
837 container_of(work, struct fw_device, work.work);
838
839 fw_device_cdev_update(device);
840 device_for_each_child(&device->device, NULL, update_unit);
841}
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100842
843/*
844 * If a device was pending for deletion because its node went away but its
845 * bus info block and root directory header matches that of a newly discovered
846 * device, revive the existing fw_device.
847 * The newly allocated fw_device becomes obsolete instead.
848 */
849static int lookup_existing_device(struct device *dev, void *data)
850{
851 struct fw_device *old = fw_device(dev);
852 struct fw_device *new = data;
853 struct fw_card *card = new->card;
854 int match = 0;
855
Stefan Richter099d5412009-06-06 18:37:25 +0200856 if (!is_fw_device(dev))
857 return 0;
858
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100859 down_read(&fw_device_rwsem); /* serialize config_rom access */
860 spin_lock_irq(&card->lock); /* serialize node access */
861
862 if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
863 atomic_cmpxchg(&old->state,
864 FW_DEVICE_GONE,
865 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
866 struct fw_node *current_node = new->node;
867 struct fw_node *obsolete_node = old->node;
868
869 new->node = obsolete_node;
870 new->node->data = new;
871 old->node = current_node;
872 old->node->data = old;
873
874 old->max_speed = new->max_speed;
875 old->node_id = current_node->node_id;
876 smp_wmb(); /* update node_id before generation */
877 old->generation = card->generation;
878 old->config_rom_retries = 0;
Stefan Richter26b49502012-02-18 22:03:14 +0100879 fw_notice(card, "rediscovered device %s\n", dev_name(dev));
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100880
881 PREPARE_DELAYED_WORK(&old->work, fw_device_update);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200882 fw_schedule_device_work(old, 0);
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100883
884 if (current_node == card->root_node)
885 fw_schedule_bm_work(card, 0);
886
887 match = 1;
888 }
889
890 spin_unlock_irq(&card->lock);
891 up_read(&fw_device_rwsem);
892
893 return match;
894}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500895
Stefan Richter7889b602009-03-10 21:09:28 +0100896enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, };
897
Stefan Richter099d5412009-06-06 18:37:25 +0200898static void set_broadcast_channel(struct fw_device *device, int generation)
Stefan Richter7889b602009-03-10 21:09:28 +0100899{
900 struct fw_card *card = device->card;
901 __be32 data;
902 int rcode;
903
904 if (!card->broadcast_channel_allocated)
905 return;
906
Stefan Richter837ec782009-06-09 23:56:55 +0200907 /*
908 * The Broadcast_Channel Valid bit is required by nodes which want to
909 * transmit on this channel. Such transmissions are practically
910 * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required
911 * to be IRM capable and have a max_rec of 8 or more. We use this fact
912 * to narrow down to which nodes we send Broadcast_Channel updates.
913 */
914 if (!device->irmc || device->max_rec < 8)
915 return;
916
917 /*
918 * Some 1394-1995 nodes crash if this 1394a-2000 register is written.
919 * Perform a read test first.
920 */
Stefan Richter7889b602009-03-10 21:09:28 +0100921 if (device->bc_implemented == BC_UNKNOWN) {
922 rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
923 device->node_id, generation, device->max_speed,
924 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
925 &data, 4);
926 switch (rcode) {
927 case RCODE_COMPLETE:
928 if (data & cpu_to_be32(1 << 31)) {
929 device->bc_implemented = BC_IMPLEMENTED;
930 break;
931 }
932 /* else fall through to case address error */
933 case RCODE_ADDRESS_ERROR:
934 device->bc_implemented = BC_UNIMPLEMENTED;
935 }
936 }
937
938 if (device->bc_implemented == BC_IMPLEMENTED) {
939 data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
940 BROADCAST_CHANNEL_VALID);
941 fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
942 device->node_id, generation, device->max_speed,
943 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
944 &data, 4);
945 }
946}
947
Stefan Richter099d5412009-06-06 18:37:25 +0200948int fw_device_set_broadcast_channel(struct device *dev, void *gen)
949{
950 if (is_fw_device(dev))
951 set_broadcast_channel(fw_device(dev), (long)gen);
952
953 return 0;
954}
955
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500956static void fw_device_init(struct work_struct *work)
957{
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500958 struct fw_device *device =
959 container_of(work, struct fw_device, work.work);
Stefan Richter26b49502012-02-18 22:03:14 +0100960 struct fw_card *card = device->card;
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100961 struct device *revived_dev;
Stefan Richtere1eff7a2009-02-03 17:55:19 +0100962 int minor, ret;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500963
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400964 /*
965 * All failure paths here set node->data to NULL, so that we
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500966 * don't try to do device_for_each_child() on a kfree()'d
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400967 * device.
968 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500969
Stefan Richterfd6e0c52010-02-19 21:00:31 +0100970 if (read_config_rom(device, device->generation) < 0) {
Stefan Richter855c6032008-02-27 22:14:27 +0100971 if (device->config_rom_retries < MAX_RETRIES &&
972 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500973 device->config_rom_retries++;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200974 fw_schedule_device_work(device, RETRY_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500975 } else {
Stefan Richter115881d2011-03-15 00:08:41 +0100976 if (device->node->link_on)
Stefan Richter26b49502012-02-18 22:03:14 +0100977 fw_notice(card, "giving up on Config ROM for node id %x\n",
Stefan Richter115881d2011-03-15 00:08:41 +0100978 device->node_id);
Stefan Richter26b49502012-02-18 22:03:14 +0100979 if (device->node == card->root_node)
980 fw_schedule_bm_work(card, 0);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500981 fw_device_release(&device->device);
982 }
983 return;
984 }
985
Stefan Richter26b49502012-02-18 22:03:14 +0100986 revived_dev = device_find_child(card->device,
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100987 device, lookup_existing_device);
988 if (revived_dev) {
989 put_device(revived_dev);
990 fw_device_release(&device->device);
991
992 return;
993 }
994
Stefan Richter62305822009-01-09 20:49:37 +0100995 device_initialize(&device->device);
Stefan Richter96b19062008-02-02 15:01:09 +0100996
997 fw_device_get(device);
Stefan Richterc9755e12008-03-24 20:54:28 +0100998 down_write(&fw_device_rwsem);
Stefan Richtere1eff7a2009-02-03 17:55:19 +0100999 ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ?
Stefan Richter62305822009-01-09 20:49:37 +01001000 idr_get_new(&fw_device_idr, device, &minor) :
1001 -ENOMEM;
Stefan Richterc9755e12008-03-24 20:54:28 +01001002 up_write(&fw_device_rwsem);
Stefan Richter96b19062008-02-02 15:01:09 +01001003
Stefan Richtere1eff7a2009-02-03 17:55:19 +01001004 if (ret < 0)
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001005 goto error;
1006
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001007 device->device.bus = &fw_bus_type;
Kristian Høgsberg21351db2007-03-20 20:58:33 -04001008 device->device.type = &fw_device_type;
Stefan Richter26b49502012-02-18 22:03:14 +01001009 device->device.parent = card->device;
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001010 device->device.devt = MKDEV(fw_cdev_major, minor);
Kay Sieversa1f64812008-10-30 01:41:56 +01001011 dev_set_name(&device->device, "fw%d", minor);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001012
Stefan Richtere5333db2009-05-22 23:16:27 +02001013 BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
1014 ARRAY_SIZE(fw_device_attributes) +
1015 ARRAY_SIZE(config_rom_attributes));
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -04001016 init_fw_attribute_group(&device->device,
1017 fw_device_attributes,
1018 &device->attribute_group);
Stefan Richtere5333db2009-05-22 23:16:27 +02001019
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001020 if (device_add(&device->device)) {
Stefan Richter26b49502012-02-18 22:03:14 +01001021 fw_err(card, "failed to add device\n");
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001022 goto error_with_cdev;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001023 }
1024
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001025 create_units(device);
1026
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001027 /*
1028 * Transition the device to running state. If it got pulled
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001029 * out from under us while we did the intialization work, we
1030 * have to shut down the device again here. Normally, though,
1031 * fw_node_event will be responsible for shutting it down when
1032 * necessary. We have to use the atomic cmpxchg here to avoid
1033 * racing with the FW_NODE_DESTROYED case in
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001034 * fw_node_event().
1035 */
Stefan Richter641f8792007-01-27 10:34:55 +01001036 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001037 FW_DEVICE_INITIALIZING,
1038 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
1039 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001040 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richterfa6e6972008-02-03 23:03:00 +01001041 } else {
Stefan Richter26b49502012-02-18 22:03:14 +01001042 fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n",
1043 dev_name(&device->device),
1044 device->config_rom[3], device->config_rom[4],
1045 1 << device->max_speed);
Stefan Richterc9755e12008-03-24 20:54:28 +01001046 device->config_rom_retries = 0;
Stefan Richter7889b602009-03-10 21:09:28 +01001047
Stefan Richter099d5412009-06-06 18:37:25 +02001048 set_broadcast_channel(device, device->generation);
Stefan Richterfa6e6972008-02-03 23:03:00 +01001049 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001050
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001051 /*
1052 * Reschedule the IRM work if we just finished reading the
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001053 * root node config rom. If this races with a bus reset we
1054 * just end up running the IRM work a couple of extra times -
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001055 * pretty harmless.
1056 */
Stefan Richter26b49502012-02-18 22:03:14 +01001057 if (device->node == card->root_node)
1058 fw_schedule_bm_work(card, 0);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001059
1060 return;
1061
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001062 error_with_cdev:
Stefan Richterc9755e12008-03-24 20:54:28 +01001063 down_write(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001064 idr_remove(&fw_device_idr, minor);
Stefan Richterc9755e12008-03-24 20:54:28 +01001065 up_write(&fw_device_rwsem);
Stefan Richter373b2ed2007-03-04 14:45:18 +01001066 error:
Stefan Richter96b19062008-02-02 15:01:09 +01001067 fw_device_put(device); /* fw_device_idr's reference */
1068
1069 put_device(&device->device); /* our reference */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001070}
1071
Stefan Richterc9755e12008-03-24 20:54:28 +01001072enum {
1073 REREAD_BIB_ERROR,
1074 REREAD_BIB_GONE,
1075 REREAD_BIB_UNCHANGED,
1076 REREAD_BIB_CHANGED,
1077};
1078
1079/* Reread and compare bus info block and header of root directory */
Stefan Richterfd6e0c52010-02-19 21:00:31 +01001080static int reread_config_rom(struct fw_device *device, int generation)
Stefan Richterc9755e12008-03-24 20:54:28 +01001081{
1082 u32 q;
1083 int i;
1084
1085 for (i = 0; i < 6; i++) {
1086 if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
1087 return REREAD_BIB_ERROR;
1088
1089 if (i == 0 && q == 0)
1090 return REREAD_BIB_GONE;
1091
Stefan Richterd01b0172009-01-17 22:45:54 +01001092 if (q != device->config_rom[i])
Stefan Richterc9755e12008-03-24 20:54:28 +01001093 return REREAD_BIB_CHANGED;
1094 }
1095
1096 return REREAD_BIB_UNCHANGED;
1097}
1098
1099static void fw_device_refresh(struct work_struct *work)
1100{
1101 struct fw_device *device =
1102 container_of(work, struct fw_device, work.work);
1103 struct fw_card *card = device->card;
1104 int node_id = device->node_id;
1105
Stefan Richterfd6e0c52010-02-19 21:00:31 +01001106 switch (reread_config_rom(device, device->generation)) {
Stefan Richterc9755e12008-03-24 20:54:28 +01001107 case REREAD_BIB_ERROR:
1108 if (device->config_rom_retries < MAX_RETRIES / 2 &&
1109 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1110 device->config_rom_retries++;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001111 fw_schedule_device_work(device, RETRY_DELAY / 2);
Stefan Richterc9755e12008-03-24 20:54:28 +01001112
1113 return;
1114 }
1115 goto give_up;
1116
1117 case REREAD_BIB_GONE:
1118 goto gone;
1119
1120 case REREAD_BIB_UNCHANGED:
1121 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001122 FW_DEVICE_INITIALIZING,
1123 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
Stefan Richterc9755e12008-03-24 20:54:28 +01001124 goto gone;
1125
1126 fw_device_update(work);
1127 device->config_rom_retries = 0;
1128 goto out;
1129
1130 case REREAD_BIB_CHANGED:
1131 break;
1132 }
1133
1134 /*
1135 * Something changed. We keep things simple and don't investigate
1136 * further. We just destroy all previous units and create new ones.
1137 */
1138 device_for_each_child(&device->device, NULL, shutdown_unit);
1139
Stefan Richterfd6e0c52010-02-19 21:00:31 +01001140 if (read_config_rom(device, device->generation) < 0) {
Stefan Richterc9755e12008-03-24 20:54:28 +01001141 if (device->config_rom_retries < MAX_RETRIES &&
1142 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1143 device->config_rom_retries++;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001144 fw_schedule_device_work(device, RETRY_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001145
1146 return;
1147 }
1148 goto give_up;
1149 }
1150
Stefan Richter8b4f70b2010-07-07 15:36:07 +02001151 fw_device_cdev_update(device);
Stefan Richterc9755e12008-03-24 20:54:28 +01001152 create_units(device);
1153
Stefan Richter0210b662009-05-23 00:03:29 +02001154 /* Userspace may want to re-read attributes. */
1155 kobject_uevent(&device->device.kobj, KOBJ_CHANGE);
1156
Stefan Richterc9755e12008-03-24 20:54:28 +01001157 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001158 FW_DEVICE_INITIALIZING,
1159 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
Stefan Richterc9755e12008-03-24 20:54:28 +01001160 goto gone;
1161
Stefan Richter26b49502012-02-18 22:03:14 +01001162 fw_notice(card, "refreshed device %s\n", dev_name(&device->device));
Stefan Richterc9755e12008-03-24 20:54:28 +01001163 device->config_rom_retries = 0;
1164 goto out;
1165
1166 give_up:
Stefan Richter26b49502012-02-18 22:03:14 +01001167 fw_notice(card, "giving up on refresh of device %s\n",
1168 dev_name(&device->device));
Stefan Richterc9755e12008-03-24 20:54:28 +01001169 gone:
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001170 atomic_set(&device->state, FW_DEVICE_GONE);
1171 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001172 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001173 out:
1174 if (node_id == card->root_node->node_id)
Jay Fenlason0fa19862008-11-29 17:44:57 +01001175 fw_schedule_bm_work(card, 0);
Stefan Richterc9755e12008-03-24 20:54:28 +01001176}
1177
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001178void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
1179{
1180 struct fw_device *device;
1181
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001182 switch (event) {
1183 case FW_NODE_CREATED:
Stefan Richter115881d2011-03-15 00:08:41 +01001184 /*
1185 * Attempt to scan the node, regardless whether its self ID has
1186 * the L (link active) flag set or not. Some broken devices
1187 * send L=0 but have an up-and-running link; others send L=1
1188 * without actually having a link.
1189 */
Stefan Richterc9755e12008-03-24 20:54:28 +01001190 create:
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001191 device = kzalloc(sizeof(*device), GFP_ATOMIC);
1192 if (device == NULL)
1193 break;
1194
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001195 /*
1196 * Do minimal intialization of the device here, the
Stefan Richter62305822009-01-09 20:49:37 +01001197 * rest will happen in fw_device_init().
1198 *
1199 * Attention: A lot of things, even fw_device_get(),
1200 * cannot be done before fw_device_init() finished!
1201 * You can basically just check device->state and
1202 * schedule work until then, but only while holding
1203 * card->lock.
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001204 */
Stefan Richter641f8792007-01-27 10:34:55 +01001205 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
Stefan Richter459f7922008-05-24 16:50:22 +02001206 device->card = fw_card_get(card);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001207 device->node = fw_node_get(node);
1208 device->node_id = node->node_id;
1209 device->generation = card->generation;
Stefan Richter92368892009-05-13 21:42:14 +02001210 device->is_local = node == card->local_node;
Stefan Richterd67cfb92008-10-05 10:37:11 +02001211 mutex_init(&device->client_list_mutex);
Kristian Høgsberg97bd9ef2007-03-07 12:12:41 -05001212 INIT_LIST_HEAD(&device->client_list);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001213
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001214 /*
1215 * Set the node data to point back to this device so
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001216 * FW_NODE_UPDATED callbacks can update the node_id
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001217 * and generation for the device.
1218 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001219 node->data = device;
1220
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001221 /*
1222 * Many devices are slow to respond after bus resets,
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001223 * especially if they are bus powered and go through
1224 * power-up after getting plugged in. We schedule the
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001225 * first config rom scan half a second after bus reset.
1226 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001227 INIT_DELAYED_WORK(&device->work, fw_device_init);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001228 fw_schedule_device_work(device, INITIAL_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001229 break;
1230
Stefan Richterc9755e12008-03-24 20:54:28 +01001231 case FW_NODE_INITIATED_RESET:
Stefan Richter115881d2011-03-15 00:08:41 +01001232 case FW_NODE_LINK_ON:
Stefan Richterc9755e12008-03-24 20:54:28 +01001233 device = node->data;
1234 if (device == NULL)
1235 goto create;
1236
1237 device->node_id = node->node_id;
1238 smp_wmb(); /* update node_id before generation */
1239 device->generation = card->generation;
1240 if (atomic_cmpxchg(&device->state,
1241 FW_DEVICE_RUNNING,
1242 FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
1243 PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001244 fw_schedule_device_work(device,
Stefan Richter92368892009-05-13 21:42:14 +02001245 device->is_local ? 0 : INITIAL_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001246 }
1247 break;
1248
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001249 case FW_NODE_UPDATED:
Stefan Richter115881d2011-03-15 00:08:41 +01001250 device = node->data;
1251 if (device == NULL)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001252 break;
1253
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001254 device->node_id = node->node_id;
Stefan Richterb5d2a5e2008-01-25 18:57:41 +01001255 smp_wmb(); /* update node_id before generation */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001256 device->generation = card->generation;
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001257 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
1258 PREPARE_DELAYED_WORK(&device->work, fw_device_update);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001259 fw_schedule_device_work(device, 0);
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001260 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001261 break;
1262
1263 case FW_NODE_DESTROYED:
1264 case FW_NODE_LINK_OFF:
1265 if (!node->data)
1266 break;
1267
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001268 /*
1269 * Destroy the device associated with the node. There
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001270 * are two cases here: either the device is fully
1271 * initialized (FW_DEVICE_RUNNING) or we're in the
1272 * process of reading its config rom
1273 * (FW_DEVICE_INITIALIZING). If it is fully
1274 * initialized we can reuse device->work to schedule a
1275 * full fw_device_shutdown(). If not, there's work
1276 * scheduled to read it's config rom, and we just put
1277 * the device in shutdown state to have that code fail
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001278 * to create the device.
1279 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001280 device = node->data;
Stefan Richter641f8792007-01-27 10:34:55 +01001281 if (atomic_xchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001282 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001283 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001284 fw_schedule_device_work(device,
Stefan Richtere747a5c2009-01-24 20:35:38 +01001285 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001286 }
1287 break;
1288 }
1289}