blob: afa7c83bd1146032031a93e571939b51809176c7 [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 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 Richterfd6e0c52010-02-19 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 Richterfd6e0c52010-02-19 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 Richterfd6e0c52010-02-19 21:00:31 +0100486static int read_config_rom(struct fw_device *device, int generation)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500487{
Stefan Richter26b49502012-02-18 22:03:14 +0100488 struct fw_card *card = device->card;
Stefan Richter13b302d2009-12-26 01:44:10 +0100489 const u32 *old_rom, *new_rom;
490 u32 *rom, *stack;
Stefan Richter1dadff72008-03-02 19:35:42 +0100491 u32 sp, key;
492 int i, end, length, ret = -1;
493
Stefan Richterfd6e0c52010-02-19 21:00:31 +0100494 rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
495 sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
Stefan Richter1dadff72008-03-02 19:35:42 +0100496 if (rom == NULL)
497 return -ENOMEM;
498
Stefan Richterfd6e0c52010-02-19 21:00:31 +0100499 stack = &rom[MAX_CONFIG_ROM_SIZE];
500 memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500501
Stefan Richterf1397492007-06-10 21:31:36 +0200502 device->max_speed = SCODE_100;
503
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500504 /* First read the bus info block. */
505 for (i = 0; i < 5; i++) {
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100506 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
Stefan Richter1dadff72008-03-02 19:35:42 +0100507 goto out;
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400508 /*
509 * As per IEEE1212 7.2, during power-up, devices can
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500510 * reply with a 0 for the first quadlet of the config
511 * rom to indicate that they are booting (for example,
512 * if the firmware is on the disk of a external
513 * harddisk). In that case we just fail, and the
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400514 * retry mechanism will try again later.
515 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500516 if (i == 0 && rom[i] == 0)
Stefan Richter1dadff72008-03-02 19:35:42 +0100517 goto out;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500518 }
519
Stefan Richterf1397492007-06-10 21:31:36 +0200520 device->max_speed = device->node->max_speed;
521
522 /*
523 * Determine the speed of
524 * - devices with link speed less than PHY speed,
525 * - devices with 1394b PHY (unless only connected to 1394a PHYs),
526 * - all devices if there are 1394b repeaters.
527 * Note, we cannot use the bus info block's link_spd as starting point
528 * because some buggy firmwares set it lower than necessary and because
529 * 1394-1995 nodes do not have the field.
530 */
531 if ((rom[2] & 0x7) < device->max_speed ||
532 device->max_speed == SCODE_BETA ||
Stefan Richter26b49502012-02-18 22:03:14 +0100533 card->beta_repeaters_present) {
Stefan Richterf1397492007-06-10 21:31:36 +0200534 u32 dummy;
535
536 /* for S1600 and S3200 */
537 if (device->max_speed == SCODE_BETA)
Stefan Richter26b49502012-02-18 22:03:14 +0100538 device->max_speed = card->link_speed;
Stefan Richterf1397492007-06-10 21:31:36 +0200539
540 while (device->max_speed > SCODE_100) {
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100541 if (read_rom(device, generation, 0, &dummy) ==
542 RCODE_COMPLETE)
Stefan Richterf1397492007-06-10 21:31:36 +0200543 break;
544 device->max_speed--;
545 }
546 }
547
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400548 /*
549 * Now parse the config rom. The config rom is a recursive
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500550 * directory structure so we parse it using a stack of
551 * references to the blocks that make up the structure. We
552 * push a reference to the root directory on the stack to
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400553 * start things off.
554 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500555 length = i;
556 sp = 0;
557 stack[sp++] = 0xc0000005;
558 while (sp > 0) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400559 /*
560 * Pop the next block reference of the stack. The
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500561 * lower 24 bits is the offset into the config rom,
562 * the upper 8 bits are the type of the reference the
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400563 * block.
564 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500565 key = stack[--sp];
566 i = key & 0xffffff;
Stefan Richterfd6e0c52010-02-19 21:00:31 +0100567 if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE))
Stefan Richter1dadff72008-03-02 19:35:42 +0100568 goto out;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500569
570 /* Read header quadlet for the block to get the length. */
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100571 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
Stefan Richter1dadff72008-03-02 19:35:42 +0100572 goto out;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500573 end = i + (rom[i] >> 16) + 1;
Stefan Richterfd6e0c52010-02-19 21:00:31 +0100574 if (end > MAX_CONFIG_ROM_SIZE) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400575 /*
Stefan Richter2799d5c2010-02-18 01:52:45 +0100576 * This block extends outside the config ROM which is
577 * a firmware bug. Ignore this whole block, i.e.
578 * simply set a fake block length of 0.
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400579 */
Stefan Richter26b49502012-02-18 22:03:14 +0100580 fw_err(card, "skipped invalid ROM block %x at %llx\n",
581 rom[i],
582 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
Stefan Richter2799d5c2010-02-18 01:52:45 +0100583 rom[i] = 0;
584 end = i;
585 }
586 i++;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500587
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400588 /*
589 * Now read in the block. If this is a directory
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500590 * block, check the entries as we read them to see if
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400591 * it references another block, and push it in that case.
592 */
Stefan Richterd54423c2010-02-18 01:50:31 +0100593 for (; i < end; i++) {
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100594 if (read_rom(device, generation, i, &rom[i]) !=
595 RCODE_COMPLETE)
Stefan Richter1dadff72008-03-02 19:35:42 +0100596 goto out;
Stefan Richterd54423c2010-02-18 01:50:31 +0100597
Stefan Richter58aaa542010-02-18 01:54:00 +0100598 if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
Stefan Richterd54423c2010-02-18 01:50:31 +0100599 continue;
600 /*
601 * Offset points outside the ROM. May be a firmware
602 * bug or an Extended ROM entry (IEEE 1212-2001 clause
603 * 7.7.18). Simply overwrite this pointer here by a
604 * fake immediate entry so that later iterators over
605 * the ROM don't have to check offsets all the time.
606 */
Stefan Richterfd6e0c52010-02-19 21:00:31 +0100607 if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) {
Stefan Richter26b49502012-02-18 22:03:14 +0100608 fw_err(card,
609 "skipped unsupported ROM entry %x at %llx\n",
610 rom[i],
611 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
Stefan Richterd54423c2010-02-18 01:50:31 +0100612 rom[i] = 0;
613 continue;
614 }
615 stack[sp++] = i + rom[i];
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500616 }
617 if (length < i)
618 length = i;
619 }
620
Stefan Richterc9755e12008-03-24 20:54:28 +0100621 old_rom = device->config_rom;
622 new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
623 if (new_rom == NULL)
Stefan Richter1dadff72008-03-02 19:35:42 +0100624 goto out;
Stefan Richterc9755e12008-03-24 20:54:28 +0100625
626 down_write(&fw_device_rwsem);
627 device->config_rom = new_rom;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500628 device->config_rom_length = length;
Stefan Richterc9755e12008-03-24 20:54:28 +0100629 up_write(&fw_device_rwsem);
630
631 kfree(old_rom);
Stefan Richter1dadff72008-03-02 19:35:42 +0100632 ret = 0;
Stefan Richter837ec782009-06-09 23:56:55 +0200633 device->max_rec = rom[2] >> 12 & 0xf;
634 device->cmc = rom[2] >> 30 & 1;
635 device->irmc = rom[2] >> 31 & 1;
Stefan Richter1dadff72008-03-02 19:35:42 +0100636 out:
637 kfree(rom);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500638
Stefan Richter1dadff72008-03-02 19:35:42 +0100639 return ret;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500640}
641
642static void fw_unit_release(struct device *dev)
643{
644 struct fw_unit *unit = fw_unit(dev);
645
Stefan Richter21076222011-08-27 18:53:03 +0200646 fw_device_put(fw_parent_device(unit));
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500647 kfree(unit);
648}
649
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400650static struct device_type fw_unit_type = {
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400651 .uevent = fw_unit_uevent,
652 .release = fw_unit_release,
653};
654
Stefan Richter099d5412009-06-06 18:37:25 +0200655static bool is_fw_unit(struct device *dev)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500656{
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400657 return dev->type == &fw_unit_type;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500658}
659
660static void create_units(struct fw_device *device)
661{
662 struct fw_csr_iterator ci;
663 struct fw_unit *unit;
664 int key, value, i;
665
666 i = 0;
667 fw_csr_iterator_init(&ci, &device->config_rom[5]);
668 while (fw_csr_iterator_next(&ci, &key, &value)) {
669 if (key != (CSR_UNIT | CSR_DIRECTORY))
670 continue;
671
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400672 /*
673 * Get the address of the unit directory and try to
674 * match the drivers id_tables against it.
675 */
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400676 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500677 if (unit == NULL) {
Stefan Richter26b49502012-02-18 22:03:14 +0100678 fw_err(device->card, "out of memory for unit\n");
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500679 continue;
680 }
681
682 unit->directory = ci.p + value - 1;
683 unit->device.bus = &fw_bus_type;
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400684 unit->device.type = &fw_unit_type;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500685 unit->device.parent = &device->device;
Kay Sieversa1f64812008-10-30 01:41:56 +0100686 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500687
Stefan Richtere5333db2009-05-22 23:16:27 +0200688 BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
689 ARRAY_SIZE(fw_unit_attributes) +
690 ARRAY_SIZE(config_rom_attributes));
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400691 init_fw_attribute_group(&unit->device,
692 fw_unit_attributes,
693 &unit->attribute_group);
Stefan Richtere5333db2009-05-22 23:16:27 +0200694
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400695 if (device_register(&unit->device) < 0)
696 goto skip_unit;
697
Stefan Richter21076222011-08-27 18:53:03 +0200698 fw_device_get(device);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400699 continue;
700
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400701 skip_unit:
702 kfree(unit);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500703 }
704}
705
706static int shutdown_unit(struct device *device, void *data)
707{
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400708 device_unregister(device);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500709
710 return 0;
711}
712
Stefan Richterc9755e12008-03-24 20:54:28 +0100713/*
714 * fw_device_rwsem acts as dual purpose mutex:
715 * - serializes accesses to fw_device_idr,
716 * - serializes accesses to fw_device.config_rom/.config_rom_length and
717 * fw_unit.directory, unless those accesses happen at safe occasions
718 */
719DECLARE_RWSEM(fw_device_rwsem);
720
Stefan Richterd6053e02008-11-24 20:40:00 +0100721DEFINE_IDR(fw_device_idr);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500722int fw_cdev_major;
723
Stefan Richter96b19062008-02-02 15:01:09 +0100724struct fw_device *fw_device_get_by_devt(dev_t devt)
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500725{
726 struct fw_device *device;
727
Stefan Richterc9755e12008-03-24 20:54:28 +0100728 down_read(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500729 device = idr_find(&fw_device_idr, MINOR(devt));
Stefan Richter96b19062008-02-02 15:01:09 +0100730 if (device)
731 fw_device_get(device);
Stefan Richterc9755e12008-03-24 20:54:28 +0100732 up_read(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500733
734 return device;
735}
736
Stefan Richter105e53f2011-05-01 20:50:31 +0200737struct workqueue_struct *fw_workqueue;
738EXPORT_SYMBOL(fw_workqueue);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200739
740static void fw_schedule_device_work(struct fw_device *device,
741 unsigned long delay)
742{
Stefan Richter105e53f2011-05-01 20:50:31 +0200743 queue_delayed_work(fw_workqueue, &device->work, delay);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200744}
745
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400746/*
747 * These defines control the retry behavior for reading the config
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500748 * rom. It shouldn't be necessary to tweak these; if the device
749 * doesn't respond to a config rom read within 10 seconds, it's not
750 * going to respond at all. As for the initial delay, a lot of
751 * devices will be able to respond within half a second after bus
752 * reset. On the other hand, it's not really worth being more
753 * aggressive than that, since it scales pretty well; if 10 devices
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400754 * are plugged in, they're all getting read within one second.
755 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500756
Kristian Høgsbergc5dfd0a2007-03-27 01:43:43 -0400757#define MAX_RETRIES 10
758#define RETRY_DELAY (3 * HZ)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500759#define INITIAL_DELAY (HZ / 2)
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100760#define SHUTDOWN_DELAY (2 * HZ)
761
762static void fw_device_shutdown(struct work_struct *work)
763{
764 struct fw_device *device =
765 container_of(work, struct fw_device, work.work);
766 int minor = MINOR(device->device.devt);
767
Clemens Ladische71084a2011-01-22 15:05:03 +0100768 if (time_before64(get_jiffies_64(),
769 device->card->reset_jiffies + SHUTDOWN_DELAY)
Stefan Richtere747a5c2009-01-24 20:35:38 +0100770 && !list_empty(&device->card->link)) {
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200771 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100772 return;
773 }
774
775 if (atomic_cmpxchg(&device->state,
776 FW_DEVICE_GONE,
777 FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
778 return;
779
780 fw_device_cdev_remove(device);
781 device_for_each_child(&device->device, NULL, shutdown_unit);
782 device_unregister(&device->device);
783
784 down_write(&fw_device_rwsem);
785 idr_remove(&fw_device_idr, minor);
786 up_write(&fw_device_rwsem);
787
788 fw_device_put(device);
789}
790
Stefan Richteraed80892009-01-17 22:45:54 +0100791static void fw_device_release(struct device *dev)
792{
793 struct fw_device *device = fw_device(dev);
794 struct fw_card *card = device->card;
795 unsigned long flags;
796
797 /*
798 * Take the card lock so we don't set this to NULL while a
799 * FW_NODE_UPDATED callback is being handled or while the
800 * bus manager work looks at this node.
801 */
802 spin_lock_irqsave(&card->lock, flags);
803 device->node->data = NULL;
804 spin_unlock_irqrestore(&card->lock, flags);
805
806 fw_node_put(device->node);
807 kfree(device->config_rom);
808 kfree(device);
809 fw_card_put(card);
810}
811
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100812static struct device_type fw_device_type = {
Stefan Richteraed80892009-01-17 22:45:54 +0100813 .release = fw_device_release,
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100814};
815
Stefan Richter099d5412009-06-06 18:37:25 +0200816static bool is_fw_device(struct device *dev)
817{
818 return dev->type == &fw_device_type;
819}
820
Stefan Richteraed80892009-01-17 22:45:54 +0100821static int update_unit(struct device *dev, void *data)
822{
823 struct fw_unit *unit = fw_unit(dev);
824 struct fw_driver *driver = (struct fw_driver *)dev->driver;
825
826 if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800827 device_lock(dev);
Stefan Richteraed80892009-01-17 22:45:54 +0100828 driver->update(unit);
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800829 device_unlock(dev);
Stefan Richteraed80892009-01-17 22:45:54 +0100830 }
831
832 return 0;
833}
834
835static void fw_device_update(struct work_struct *work)
836{
837 struct fw_device *device =
838 container_of(work, struct fw_device, work.work);
839
840 fw_device_cdev_update(device);
841 device_for_each_child(&device->device, NULL, update_unit);
842}
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100843
844/*
845 * If a device was pending for deletion because its node went away but its
846 * bus info block and root directory header matches that of a newly discovered
847 * device, revive the existing fw_device.
848 * The newly allocated fw_device becomes obsolete instead.
849 */
850static int lookup_existing_device(struct device *dev, void *data)
851{
852 struct fw_device *old = fw_device(dev);
853 struct fw_device *new = data;
854 struct fw_card *card = new->card;
855 int match = 0;
856
Stefan Richter099d5412009-06-06 18:37:25 +0200857 if (!is_fw_device(dev))
858 return 0;
859
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100860 down_read(&fw_device_rwsem); /* serialize config_rom access */
861 spin_lock_irq(&card->lock); /* serialize node access */
862
863 if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
864 atomic_cmpxchg(&old->state,
865 FW_DEVICE_GONE,
866 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
867 struct fw_node *current_node = new->node;
868 struct fw_node *obsolete_node = old->node;
869
870 new->node = obsolete_node;
871 new->node->data = new;
872 old->node = current_node;
873 old->node->data = old;
874
875 old->max_speed = new->max_speed;
876 old->node_id = current_node->node_id;
877 smp_wmb(); /* update node_id before generation */
878 old->generation = card->generation;
879 old->config_rom_retries = 0;
Stefan Richter26b49502012-02-18 22:03:14 +0100880 fw_notice(card, "rediscovered device %s\n", dev_name(dev));
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100881
882 PREPARE_DELAYED_WORK(&old->work, fw_device_update);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200883 fw_schedule_device_work(old, 0);
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100884
885 if (current_node == card->root_node)
886 fw_schedule_bm_work(card, 0);
887
888 match = 1;
889 }
890
891 spin_unlock_irq(&card->lock);
892 up_read(&fw_device_rwsem);
893
894 return match;
895}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500896
Stefan Richter7889b602009-03-10 21:09:28 +0100897enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, };
898
Stefan Richter099d5412009-06-06 18:37:25 +0200899static void set_broadcast_channel(struct fw_device *device, int generation)
Stefan Richter7889b602009-03-10 21:09:28 +0100900{
901 struct fw_card *card = device->card;
902 __be32 data;
903 int rcode;
904
905 if (!card->broadcast_channel_allocated)
906 return;
907
Stefan Richter837ec782009-06-09 23:56:55 +0200908 /*
909 * The Broadcast_Channel Valid bit is required by nodes which want to
910 * transmit on this channel. Such transmissions are practically
911 * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required
912 * to be IRM capable and have a max_rec of 8 or more. We use this fact
913 * to narrow down to which nodes we send Broadcast_Channel updates.
914 */
915 if (!device->irmc || device->max_rec < 8)
916 return;
917
918 /*
919 * Some 1394-1995 nodes crash if this 1394a-2000 register is written.
920 * Perform a read test first.
921 */
Stefan Richter7889b602009-03-10 21:09:28 +0100922 if (device->bc_implemented == BC_UNKNOWN) {
923 rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
924 device->node_id, generation, device->max_speed,
925 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
926 &data, 4);
927 switch (rcode) {
928 case RCODE_COMPLETE:
929 if (data & cpu_to_be32(1 << 31)) {
930 device->bc_implemented = BC_IMPLEMENTED;
931 break;
932 }
933 /* else fall through to case address error */
934 case RCODE_ADDRESS_ERROR:
935 device->bc_implemented = BC_UNIMPLEMENTED;
936 }
937 }
938
939 if (device->bc_implemented == BC_IMPLEMENTED) {
940 data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
941 BROADCAST_CHANNEL_VALID);
942 fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
943 device->node_id, generation, device->max_speed,
944 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
945 &data, 4);
946 }
947}
948
Stefan Richter099d5412009-06-06 18:37:25 +0200949int fw_device_set_broadcast_channel(struct device *dev, void *gen)
950{
951 if (is_fw_device(dev))
952 set_broadcast_channel(fw_device(dev), (long)gen);
953
954 return 0;
955}
956
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500957static void fw_device_init(struct work_struct *work)
958{
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500959 struct fw_device *device =
960 container_of(work, struct fw_device, work.work);
Stefan Richter26b49502012-02-18 22:03:14 +0100961 struct fw_card *card = device->card;
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100962 struct device *revived_dev;
Stefan Richtere1eff7a2009-02-03 17:55:19 +0100963 int minor, ret;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500964
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400965 /*
966 * All failure paths here set node->data to NULL, so that we
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500967 * don't try to do device_for_each_child() on a kfree()'d
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400968 * device.
969 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500970
Stefan Richterfd6e0c52010-02-19 21:00:31 +0100971 if (read_config_rom(device, device->generation) < 0) {
Stefan Richter855c6032008-02-27 22:14:27 +0100972 if (device->config_rom_retries < MAX_RETRIES &&
973 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500974 device->config_rom_retries++;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200975 fw_schedule_device_work(device, RETRY_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500976 } else {
Stefan Richter115881d2011-03-15 00:08:41 +0100977 if (device->node->link_on)
Stefan Richter26b49502012-02-18 22:03:14 +0100978 fw_notice(card, "giving up on Config ROM for node id %x\n",
Stefan Richter115881d2011-03-15 00:08:41 +0100979 device->node_id);
Stefan Richter26b49502012-02-18 22:03:14 +0100980 if (device->node == card->root_node)
981 fw_schedule_bm_work(card, 0);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500982 fw_device_release(&device->device);
983 }
984 return;
985 }
986
Stefan Richter26b49502012-02-18 22:03:14 +0100987 revived_dev = device_find_child(card->device,
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100988 device, lookup_existing_device);
989 if (revived_dev) {
990 put_device(revived_dev);
991 fw_device_release(&device->device);
992
993 return;
994 }
995
Stefan Richter62305822009-01-09 20:49:37 +0100996 device_initialize(&device->device);
Stefan Richter96b19062008-02-02 15:01:09 +0100997
998 fw_device_get(device);
Stefan Richterc9755e12008-03-24 20:54:28 +0100999 down_write(&fw_device_rwsem);
Stefan Richtere1eff7a2009-02-03 17:55:19 +01001000 ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ?
Stefan Richter62305822009-01-09 20:49:37 +01001001 idr_get_new(&fw_device_idr, device, &minor) :
1002 -ENOMEM;
Stefan Richterc9755e12008-03-24 20:54:28 +01001003 up_write(&fw_device_rwsem);
Stefan Richter96b19062008-02-02 15:01:09 +01001004
Stefan Richtere1eff7a2009-02-03 17:55:19 +01001005 if (ret < 0)
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001006 goto error;
1007
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001008 device->device.bus = &fw_bus_type;
Kristian Høgsberg21351db2007-03-20 20:58:33 -04001009 device->device.type = &fw_device_type;
Stefan Richter26b49502012-02-18 22:03:14 +01001010 device->device.parent = card->device;
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001011 device->device.devt = MKDEV(fw_cdev_major, minor);
Kay Sieversa1f64812008-10-30 01:41:56 +01001012 dev_set_name(&device->device, "fw%d", minor);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001013
Stefan Richtere5333db2009-05-22 23:16:27 +02001014 BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
1015 ARRAY_SIZE(fw_device_attributes) +
1016 ARRAY_SIZE(config_rom_attributes));
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -04001017 init_fw_attribute_group(&device->device,
1018 fw_device_attributes,
1019 &device->attribute_group);
Stefan Richtere5333db2009-05-22 23:16:27 +02001020
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001021 if (device_add(&device->device)) {
Stefan Richter26b49502012-02-18 22:03:14 +01001022 fw_err(card, "failed to add device\n");
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001023 goto error_with_cdev;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001024 }
1025
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001026 create_units(device);
1027
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001028 /*
1029 * Transition the device to running state. If it got pulled
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001030 * out from under us while we did the intialization work, we
1031 * have to shut down the device again here. Normally, though,
1032 * fw_node_event will be responsible for shutting it down when
1033 * necessary. We have to use the atomic cmpxchg here to avoid
1034 * racing with the FW_NODE_DESTROYED case in
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001035 * fw_node_event().
1036 */
Stefan Richter641f8792007-01-27 10:34:55 +01001037 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001038 FW_DEVICE_INITIALIZING,
1039 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
1040 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001041 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richterfa6e6972008-02-03 23:03:00 +01001042 } else {
Stefan Richter26b49502012-02-18 22:03:14 +01001043 fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n",
1044 dev_name(&device->device),
1045 device->config_rom[3], device->config_rom[4],
1046 1 << device->max_speed);
Stefan Richterc9755e12008-03-24 20:54:28 +01001047 device->config_rom_retries = 0;
Stefan Richter7889b602009-03-10 21:09:28 +01001048
Stefan Richter099d5412009-06-06 18:37:25 +02001049 set_broadcast_channel(device, device->generation);
Stefan Richterfa6e6972008-02-03 23:03:00 +01001050 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001051
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001052 /*
1053 * Reschedule the IRM work if we just finished reading the
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001054 * root node config rom. If this races with a bus reset we
1055 * just end up running the IRM work a couple of extra times -
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001056 * pretty harmless.
1057 */
Stefan Richter26b49502012-02-18 22:03:14 +01001058 if (device->node == card->root_node)
1059 fw_schedule_bm_work(card, 0);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001060
1061 return;
1062
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001063 error_with_cdev:
Stefan Richterc9755e12008-03-24 20:54:28 +01001064 down_write(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001065 idr_remove(&fw_device_idr, minor);
Stefan Richterc9755e12008-03-24 20:54:28 +01001066 up_write(&fw_device_rwsem);
Stefan Richter373b2ed2007-03-04 14:45:18 +01001067 error:
Stefan Richter96b19062008-02-02 15:01:09 +01001068 fw_device_put(device); /* fw_device_idr's reference */
1069
1070 put_device(&device->device); /* our reference */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001071}
1072
Stefan Richterc9755e12008-03-24 20:54:28 +01001073enum {
1074 REREAD_BIB_ERROR,
1075 REREAD_BIB_GONE,
1076 REREAD_BIB_UNCHANGED,
1077 REREAD_BIB_CHANGED,
1078};
1079
1080/* Reread and compare bus info block and header of root directory */
Stefan Richterfd6e0c52010-02-19 21:00:31 +01001081static int reread_config_rom(struct fw_device *device, int generation)
Stefan Richterc9755e12008-03-24 20:54:28 +01001082{
1083 u32 q;
1084 int i;
1085
1086 for (i = 0; i < 6; i++) {
1087 if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
1088 return REREAD_BIB_ERROR;
1089
1090 if (i == 0 && q == 0)
1091 return REREAD_BIB_GONE;
1092
Stefan Richterd01b0172009-01-17 22:45:54 +01001093 if (q != device->config_rom[i])
Stefan Richterc9755e12008-03-24 20:54:28 +01001094 return REREAD_BIB_CHANGED;
1095 }
1096
1097 return REREAD_BIB_UNCHANGED;
1098}
1099
1100static void fw_device_refresh(struct work_struct *work)
1101{
1102 struct fw_device *device =
1103 container_of(work, struct fw_device, work.work);
1104 struct fw_card *card = device->card;
1105 int node_id = device->node_id;
1106
Stefan Richterfd6e0c52010-02-19 21:00:31 +01001107 switch (reread_config_rom(device, device->generation)) {
Stefan Richterc9755e12008-03-24 20:54:28 +01001108 case REREAD_BIB_ERROR:
1109 if (device->config_rom_retries < MAX_RETRIES / 2 &&
1110 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1111 device->config_rom_retries++;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001112 fw_schedule_device_work(device, RETRY_DELAY / 2);
Stefan Richterc9755e12008-03-24 20:54:28 +01001113
1114 return;
1115 }
1116 goto give_up;
1117
1118 case REREAD_BIB_GONE:
1119 goto gone;
1120
1121 case REREAD_BIB_UNCHANGED:
1122 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001123 FW_DEVICE_INITIALIZING,
1124 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
Stefan Richterc9755e12008-03-24 20:54:28 +01001125 goto gone;
1126
1127 fw_device_update(work);
1128 device->config_rom_retries = 0;
1129 goto out;
1130
1131 case REREAD_BIB_CHANGED:
1132 break;
1133 }
1134
1135 /*
1136 * Something changed. We keep things simple and don't investigate
1137 * further. We just destroy all previous units and create new ones.
1138 */
1139 device_for_each_child(&device->device, NULL, shutdown_unit);
1140
Stefan Richterfd6e0c52010-02-19 21:00:31 +01001141 if (read_config_rom(device, device->generation) < 0) {
Stefan Richterc9755e12008-03-24 20:54:28 +01001142 if (device->config_rom_retries < MAX_RETRIES &&
1143 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1144 device->config_rom_retries++;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001145 fw_schedule_device_work(device, RETRY_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001146
1147 return;
1148 }
1149 goto give_up;
1150 }
1151
Stefan Richter8b4f70b2010-07-07 15:36:07 +02001152 fw_device_cdev_update(device);
Stefan Richterc9755e12008-03-24 20:54:28 +01001153 create_units(device);
1154
Stefan Richter0210b662009-05-23 00:03:29 +02001155 /* Userspace may want to re-read attributes. */
1156 kobject_uevent(&device->device.kobj, KOBJ_CHANGE);
1157
Stefan Richterc9755e12008-03-24 20:54:28 +01001158 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001159 FW_DEVICE_INITIALIZING,
1160 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
Stefan Richterc9755e12008-03-24 20:54:28 +01001161 goto gone;
1162
Stefan Richter26b49502012-02-18 22:03:14 +01001163 fw_notice(card, "refreshed device %s\n", dev_name(&device->device));
Stefan Richterc9755e12008-03-24 20:54:28 +01001164 device->config_rom_retries = 0;
1165 goto out;
1166
1167 give_up:
Stefan Richter26b49502012-02-18 22:03:14 +01001168 fw_notice(card, "giving up on refresh of device %s\n",
1169 dev_name(&device->device));
Stefan Richterc9755e12008-03-24 20:54:28 +01001170 gone:
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001171 atomic_set(&device->state, FW_DEVICE_GONE);
1172 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001173 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001174 out:
1175 if (node_id == card->root_node->node_id)
Jay Fenlason0fa19862008-11-29 17:44:57 +01001176 fw_schedule_bm_work(card, 0);
Stefan Richterc9755e12008-03-24 20:54:28 +01001177}
1178
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001179void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
1180{
1181 struct fw_device *device;
1182
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001183 switch (event) {
1184 case FW_NODE_CREATED:
Stefan Richter115881d2011-03-15 00:08:41 +01001185 /*
1186 * Attempt to scan the node, regardless whether its self ID has
1187 * the L (link active) flag set or not. Some broken devices
1188 * send L=0 but have an up-and-running link; others send L=1
1189 * without actually having a link.
1190 */
Stefan Richterc9755e12008-03-24 20:54:28 +01001191 create:
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001192 device = kzalloc(sizeof(*device), GFP_ATOMIC);
1193 if (device == NULL)
1194 break;
1195
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001196 /*
1197 * Do minimal intialization of the device here, the
Stefan Richter62305822009-01-09 20:49:37 +01001198 * rest will happen in fw_device_init().
1199 *
1200 * Attention: A lot of things, even fw_device_get(),
1201 * cannot be done before fw_device_init() finished!
1202 * You can basically just check device->state and
1203 * schedule work until then, but only while holding
1204 * card->lock.
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001205 */
Stefan Richter641f8792007-01-27 10:34:55 +01001206 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
Stefan Richter459f7922008-05-24 16:50:22 +02001207 device->card = fw_card_get(card);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001208 device->node = fw_node_get(node);
1209 device->node_id = node->node_id;
1210 device->generation = card->generation;
Stefan Richter92368892009-05-13 21:42:14 +02001211 device->is_local = node == card->local_node;
Stefan Richterd67cfb92008-10-05 10:37:11 +02001212 mutex_init(&device->client_list_mutex);
Kristian Høgsberg97bd9ef2007-03-07 12:12:41 -05001213 INIT_LIST_HEAD(&device->client_list);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001214
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001215 /*
1216 * Set the node data to point back to this device so
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001217 * FW_NODE_UPDATED callbacks can update the node_id
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001218 * and generation for the device.
1219 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001220 node->data = device;
1221
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001222 /*
1223 * Many devices are slow to respond after bus resets,
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001224 * especially if they are bus powered and go through
1225 * power-up after getting plugged in. We schedule the
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001226 * first config rom scan half a second after bus reset.
1227 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001228 INIT_DELAYED_WORK(&device->work, fw_device_init);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001229 fw_schedule_device_work(device, INITIAL_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001230 break;
1231
Stefan Richterc9755e12008-03-24 20:54:28 +01001232 case FW_NODE_INITIATED_RESET:
Stefan Richter115881d2011-03-15 00:08:41 +01001233 case FW_NODE_LINK_ON:
Stefan Richterc9755e12008-03-24 20:54:28 +01001234 device = node->data;
1235 if (device == NULL)
1236 goto create;
1237
1238 device->node_id = node->node_id;
1239 smp_wmb(); /* update node_id before generation */
1240 device->generation = card->generation;
1241 if (atomic_cmpxchg(&device->state,
1242 FW_DEVICE_RUNNING,
1243 FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
1244 PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001245 fw_schedule_device_work(device,
Stefan Richter92368892009-05-13 21:42:14 +02001246 device->is_local ? 0 : INITIAL_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001247 }
1248 break;
1249
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001250 case FW_NODE_UPDATED:
Stefan Richter115881d2011-03-15 00:08:41 +01001251 device = node->data;
1252 if (device == NULL)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001253 break;
1254
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001255 device->node_id = node->node_id;
Stefan Richterb5d2a5e2008-01-25 18:57:41 +01001256 smp_wmb(); /* update node_id before generation */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001257 device->generation = card->generation;
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001258 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
1259 PREPARE_DELAYED_WORK(&device->work, fw_device_update);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001260 fw_schedule_device_work(device, 0);
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001261 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001262 break;
1263
1264 case FW_NODE_DESTROYED:
1265 case FW_NODE_LINK_OFF:
1266 if (!node->data)
1267 break;
1268
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001269 /*
1270 * Destroy the device associated with the node. There
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001271 * are two cases here: either the device is fully
1272 * initialized (FW_DEVICE_RUNNING) or we're in the
1273 * process of reading its config rom
1274 * (FW_DEVICE_INITIALIZING). If it is fully
1275 * initialized we can reuse device->work to schedule a
1276 * full fw_device_shutdown(). If not, there's work
1277 * scheduled to read it's config rom, and we just put
1278 * the device in shutdown state to have that code fail
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001279 * to create the device.
1280 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001281 device = node->data;
Stefan Richter641f8792007-01-27 10:34:55 +01001282 if (atomic_xchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001283 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001284 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001285 fw_schedule_device_work(device,
Stefan Richtere747a5c2009-01-24 20:35:38 +01001286 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001287 }
1288 break;
1289 }
1290}