// SPDX-License-Identifier: GPL-2.0-or-later/* * Device probing and sysfs code. * * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> */ #include <linux/bug.h>#include <linux/ctype.h>#include <linux/delay.h>#include <linux/device.h>#include <linux/errno.h>#include <linux/firewire.h>#include <linux/firewire-constants.h>#include <linux/idr.h>#include <linux/jiffies.h>#include <linux/kobject.h>#include <linux/list.h>#include <linux/mod_devicetable.h>#include <linux/module.h>#include <linux/mutex.h>#include <linux/random.h>#include <linux/rwsem.h>#include <linux/slab.h>#include <linux/spinlock.h>#include <linux/string.h>#include <linux/workqueue.h> #include <linux/atomic.h>#include <asm/byteorder.h> #include "core.h" void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p){ ci->p = p + 1; ci->end = ci->p + (p[0] >> 16);}EXPORT_SYMBOL(fw_csr_iterator_init); int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value){ *key = *ci->p >> 24; *value = *ci->p & 0xffffff; return ci->p++ < ci->end;}EXPORT_SYMBOL(fw_csr_iterator_next); static const u32 *search_leaf(const u32 *directory, int search_key){ struct fw_csr_iterator ci; int last_key = 0, key, value; fw_csr_iterator_init(&ci, directory); while (fw_csr_iterator_next(&ci, &key, &value)) { if (last_key == search_key && key == (CSR_DESCRIPTOR | CSR_LEAF)) return ci.p - 1 + value; last_key = key; } return NULL;} static int textual_leaf_to_string(const u32 *block, char *buf, size_t size){ unsigned int quadlets, i; char c; if (!size || !buf) return -EINVAL; quadlets = min(block[0] >> 16, 256U); if (quadlets < 2) return -ENODATA; if (block[1] != 0 || block[2] != 0) /* unknown language/character set */ return -ENODATA; block += 3; quadlets -= 2; for (i = 0; i < quadlets * 4 && i < size - 1; i++) { c = block[i / 4] >> (24 - 8 * (i % 4)); if (c == '\0') break; buf[i] = c; } buf[i] = '\0'; return i;} /** * fw_csr_string() - reads a string from the configuration ROM * @directory: e.g. root directory or unit directory * @key: the key of the preceding directory entry * @buf: where to put the string * @size: size of @buf, in bytes * * The string is taken from a minimal ASCII text descriptor leaf after * the immediate entry with @key. The string is zero-terminated. * An overlong string is silently truncated such that it and the * zero byte fit into @size. * * Returns strlen(buf) or a negative error code. */int fw_csr_string(const u32 *directory, int key, char *buf, size_t size){ const u32 *leaf = search_leaf(directory, key); if (!leaf) return -ENOENT; return textual_leaf_to_string(leaf, buf, size);}EXPORT_SYMBOL(fw_csr_string); static void get_ids(const u32 *directory, int *id){ struct fw_csr_iterator ci; int key, value; fw_csr_iterator_init(&ci, directory); while (fw_csr_iterator_next(&ci, &key, &value)) { switch (key) { case CSR_VENDOR: id[0] = value; break; case CSR_MODEL: id[1] = value; break; case CSR_SPECIFIER_ID: id[2] = value; break; case CSR_VERSION: id[3] = value; break; } }} static void get_modalias_ids(struct fw_unit *unit, int *id){ get_ids(&fw_parent_device(unit)->config_rom[5], id); get_ids(unit->directory, id);} static bool match_ids(const struct ieee1394_device_id *id_table, int *id){ int match = 0; if (id[0] == id_table->vendor_id) match |= IEEE1394_MATCH_VENDOR_ID; if (id[1] == id_table->model_id) match |= IEEE1394_MATCH_MODEL_ID; if (id[2] == id_table->specifier_id) match |= IEEE1394_MATCH_SPECIFIER_ID; if (id[3] == id_table->version) match |= IEEE1394_MATCH_VERSION; return (match & id_table->match_flags) == id_table->match_flags;} static const struct ieee1394_device_id *unit_match(struct device *dev, struct device_driver *drv){ const struct ieee1394_device_id *id_table = container_of(drv, struct fw_driver, driver)->id_table; int id[] = {0, 0, 0, 0}; get_modalias_ids(fw_unit(dev), id); for (; id_table->match_flags != 0; id_table++) if (match_ids(id_table, id)) return id_table; return NULL;} static bool is_fw_unit(struct device *dev); static int fw_unit_match(struct device *dev, struct device_driver *drv){ /* We only allow binding to fw_units. */ return is_fw_unit(dev) && unit_match(dev, drv) != NULL;} static int fw_unit_probe(struct device *dev){ struct fw_driver *driver = container_of(dev->driver, struct fw_driver, driver); return driver->probe(fw_unit(dev), unit_match(dev, dev->driver));} static int fw_unit_remove(struct device *dev){ struct fw_driver *driver = container_of(dev->driver, struct fw_driver, driver); return driver->remove(fw_unit(dev)), 0;} static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size){ int id[] = {0, 0, 0, 0}; get_modalias_ids(unit, id); return snprintf(buffer, buffer_size, "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", id[0], id[1], id[2], id[3]);} static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env){ struct fw_unit *unit = fw_unit(dev); char modalias[64]; get_modalias(unit, modalias, sizeof(modalias)); if (add_uevent_var(env, "MODALIAS=%s", modalias)) return -ENOMEM; return 0;} struct bus_type fw_bus_type = { .name = "firewire", .match = fw_unit_match, .probe = fw_unit_probe, .remove = fw_unit_remove,};EXPORT_SYMBOL(fw_bus_type); int fw_device_enable_phys_dma(struct fw_device *device){ int generation = device->generation; /* device->node_id, accessed below, must not be older than generation */ smp_rmb(); return device->card->driver->enable_phys_dma(device->card, device->node_id, generation);}EXPORT_SYMBOL(fw_device_enable_phys_dma); struct config_rom_attribute { struct device_attribute attr; u32 key;}; static ssize_t show_immediate(struct device *dev, struct device_attribute *dattr, char *buf){ struct config_rom_attribute *attr = container_of(dattr, struct config_rom_attribute, attr); struct fw_csr_iterator ci; const u32 *dir; int key, value, ret = -ENOENT; down_read(&fw_device_rwsem); if (is_fw_unit(dev)) dir = fw_unit(dev)->directory; else dir = fw_device(dev)->config_rom + 5; fw_csr_iterator_init(&ci, dir); while (fw_csr_iterator_next(&ci, &key, &value)) if (attr->key == key) { ret = snprintf(buf, buf ? PAGE_SIZE : 0, "0x%06x\n", value); break; } up_read(&fw_device_rwsem); return ret;} #define IMMEDIATE_ATTR(name, key) \ { __ATTR(name, S_IRUGO, show_immediate, NULL), key } static ssize_t show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf){ struct config_rom_attribute *attr = container_of(dattr, struct config_rom_attribute, attr); const u32 *dir; size_t bufsize; char dummy_buf[2]; int ret; down_read(&fw_device_rwsem); if (is_fw_unit(dev)) dir = fw_unit(dev)->directory; else dir = fw_device(dev)->config_rom + 5; if (buf) { bufsize = PAGE_SIZE - 1; } else { buf = dummy_buf; bufsize = 1; } ret = fw_csr_string(dir, attr->key, buf, bufsize); if (ret >= 0) { /* Strip trailing whitespace and add newline. */ while (ret > 0 && isspace(buf[ret - 1])) ret--; strcpy(buf + ret, "\n"); ret++; } up_read(&fw_device_rwsem); return ret;} #define TEXT_LEAF_ATTR(name, key) \ { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } static struct config_rom_attribute config_rom_attributes[] = { IMMEDIATE_ATTR(vendor, CSR_VENDOR), IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), IMMEDIATE_ATTR(version, CSR_VERSION), IMMEDIATE_ATTR(model, CSR_MODEL), TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), TEXT_LEAF_ATTR(model_name, CSR_MODEL), TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),}; static void init_fw_attribute_group(struct device *dev, struct device_attribute *attrs, struct fw_attribute_group *group){ struct device_attribute *attr; int i, j; for (j = 0; attrs[j].attr.name != NULL; j++) group->attrs[j] = &attrs[j].attr; for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { attr = &config_rom_attributes[i].attr; if (attr->show(dev, attr, NULL) < 0) continue; group->attrs[j++] = &attr->attr; } group->attrs[j] = NULL; group->groups[0] = &group->group; group->groups[1] = NULL; group->group.attrs = group->attrs; dev->groups = (const struct attribute_group **) group->groups;} static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf){ struct fw_unit *unit = fw_unit(dev); int length; length = get_modalias(unit, buf, PAGE_SIZE); strcpy(buf + length, "\n"); return length + 1;} static ssize_t rom_index_show(struct device *dev, struct device_attribute *attr, char *buf){ struct fw_device *device = fw_device(dev->parent); struct fw_unit *unit = fw_unit(dev); return snprintf(buf, PAGE_SIZE, "%d\n", (int)(unit->directory - device->config_rom));} static struct device_attribute fw_unit_attributes[] = { __ATTR_RO(modalias), __ATTR_RO(rom_index), __ATTR_NULL,}; static ssize_t config_rom_show(struct device *dev, struct device_attribute *attr, char *buf){ struct fw_device *device = fw_device(dev); size_t length; down_read(&fw_device_rwsem); length = device->config_rom_length * 4; memcpy(buf, device->config_rom, length); up_read(&fw_device_rwsem); return length;} static ssize_t guid_show(struct device *dev, struct device_attribute *attr, char *buf){ struct fw_device *device = fw_device(dev); int ret; down_read(&fw_device_rwsem); ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", device->config_rom[3], device->config_rom[4]); up_read(&fw_device_rwsem); return ret;} static ssize_t is_local_show(struct device *dev, struct device_attribute *attr, char *buf){ struct fw_device *device = fw_device(dev); return sprintf(buf, "%u\n", device->is_local);} static int units_sprintf(char *buf, const u32 *directory){ struct fw_csr_iterator ci; int key, value; int specifier_id = 0; int version = 0; fw_csr_iterator_init(&ci, directory); while (fw_csr_iterator_next(&ci, &key, &value)) { switch (key) { case CSR_SPECIFIER_ID: specifier_id = value; break; case CSR_VERSION: version = value; break; } } return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version);} static ssize_t units_show(struct device *dev, struct device_attribute *attr, char *buf){ struct fw_device *device = fw_device(dev); struct fw_csr_iterator ci; int key, value, i = 0; down_read(&fw_device_rwsem); fw_csr_iterator_init(&ci, &device->config_rom[5]); while (fw_csr_iterator_next(&ci, &key, &value)) { if (key != (CSR_UNIT | CSR_DIRECTORY)) continue; i += units_sprintf(&buf[i], ci.p + value - 1); if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) break; } up_read(&fw_device_rwsem); if (i) buf[i - 1] = '\n'; return i;} static struct device_attribute fw_device_attributes[] = { __ATTR_RO(config_rom), __ATTR_RO(guid), __ATTR_RO(is_local), __ATTR_RO(units), __ATTR_NULL,}; static int read_rom(struct fw_device *device, int generation, int index, u32 *data){ u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4; int i, rcode; /* device->node_id, accessed below, must not be older than generation */ smp_rmb(); for (i = 10; i < 100; i += 10) { rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, device->node_id, generation, device->max_speed, offset, data, 4); if (rcode != RCODE_BUSY) break; msleep(i); } be32_to_cpus(data); return rcode;} #define MAX_CONFIG_ROM_SIZE 256 /* * Read the bus info block, perform a speed probe, and read all of the rest ofLines 1–500 of 1315. 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// SPDX-License-Identifier: GPL-2.0-or-later /* * Device probing and sysfs code. * * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> */ #include <linux/bug.h> #include <linux/ctype.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/firewire.h> #include <linux/firewire-constants.h> #include <linux/idr.h> #include <linux/jiffies.h> #include <linux/kobject.h> #include <linux/list.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/random.h> #include <linux/rwsem.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/string.h> #include <linux/workqueue.h> #include <linux/atomic.h> #include <asm/byteorder.h> #include "core.h" void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p) { ci->p = p + 1; ci->end = ci->p + (p[0] >> 16); } EXPORT_SYMBOL(fw_csr_iterator_init); int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) { *key = *ci->p >> 24; *value = *ci->p & 0xffffff; return ci->p++ < ci->end; } EXPORT_SYMBOL(fw_csr_iterator_next); static const u32 *search_leaf(const u32 *directory, int search_key) { struct fw_csr_iterator ci; int last_key = 0, key, value; fw_csr_iterator_init(&ci, directory); while (fw_csr_iterator_next(&ci, &key, &value)) { if (last_key == search_key && key == (CSR_DESCRIPTOR | CSR_LEAF)) return ci.p - 1 + value; last_key = key; } return NULL; } static int textual_leaf_to_string(const u32 *block, char *buf, size_t size) { unsigned int quadlets, i; char c; if (!size || !buf) return -EINVAL; quadlets = min(block[0] >> 16, 256U); if (quadlets < 2) return -ENODATA; if (block[1] != 0 || block[2] != 0) /* unknown language/character set */ return -ENODATA; block += 3; quadlets -= 2; for (i = 0; i < quadlets * 4 && i < size - 1; i++) { c = block[i / 4] >> (24 - 8 * (i % 4)); if (c == '\0') break; buf[i] = c; } buf[i] = '\0'; return i; } /** * fw_csr_string() - reads a string from the configuration ROM * @directory: e.g. root directory or unit directory * @key: the key of the preceding directory entry * @buf: where to put the string * @size: size of @buf, in bytes * * The string is taken from a minimal ASCII text descriptor leaf after * the immediate entry with @key. The string is zero-terminated. * An overlong string is silently truncated such that it and the * zero byte fit into @size. * * Returns strlen(buf) or a negative error code. */ int fw_csr_string(const u32 *directory, int key, char *buf, size_t size) { const u32 *leaf = search_leaf(directory, key); if (!leaf) return -ENOENT; return textual_leaf_to_string(leaf, buf, size); } EXPORT_SYMBOL(fw_csr_string); static void get_ids(const u32 *directory, int *id) { struct fw_csr_iterator ci; int key, value; fw_csr_iterator_init(&ci, directory); while (fw_csr_iterator_next(&ci, &key, &value)) { switch (key) { case CSR_VENDOR: id[0] = value; break; case CSR_MODEL: id[1] = value; break; case CSR_SPECIFIER_ID: id[2] = value; break; case CSR_VERSION: id[3] = value; break; } } } static void get_modalias_ids(struct fw_unit *unit, int *id) { get_ids(&fw_parent_device(unit)->config_rom[5], id); get_ids(unit->directory, id); } static bool match_ids(const struct ieee1394_device_id *id_table, int *id) { int match = 0; if (id[0] == id_table->vendor_id) match |= IEEE1394_MATCH_VENDOR_ID; if (id[1] == id_table->model_id) match |= IEEE1394_MATCH_MODEL_ID; if (id[2] == id_table->specifier_id) match |= IEEE1394_MATCH_SPECIFIER_ID; if (id[3] == id_table->version) match |= IEEE1394_MATCH_VERSION; return (match & id_table->match_flags) == id_table->match_flags; } static const struct ieee1394_device_id *unit_match(struct device *dev, struct device_driver *drv) { const struct ieee1394_device_id *id_table = container_of(drv, struct fw_driver, driver)->id_table; int id[] = {0, 0, 0, 0}; get_modalias_ids(fw_unit(dev), id); for (; id_table->match_flags != 0; id_table++) if (match_ids(id_table, id)) return id_table; return NULL; } static bool is_fw_unit(struct device *dev); static int fw_unit_match(struct device *dev, struct device_driver *drv) { /* We only allow binding to fw_units. */ return is_fw_unit(dev) && unit_match(dev, drv) != NULL; } static int fw_unit_probe(struct device *dev) { struct fw_driver *driver = container_of(dev->driver, struct fw_driver, driver); return driver->probe(fw_unit(dev), unit_match(dev, dev->driver)); } static int fw_unit_remove(struct device *dev) { struct fw_driver *driver = container_of(dev->driver, struct fw_driver, driver); return driver->remove(fw_unit(dev)), 0; } static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) { int id[] = {0, 0, 0, 0}; get_modalias_ids(unit, id); return snprintf(buffer, buffer_size, "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", id[0], id[1], id[2], id[3]); } static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) { struct fw_unit *unit = fw_unit(dev); char modalias[64]; get_modalias(unit, modalias, sizeof(modalias)); if (add_uevent_var(env, "MODALIAS=%s", modalias)) return -ENOMEM; return 0; } struct bus_type fw_bus_type = { .name = "firewire", .match = fw_unit_match, .probe = fw_unit_probe, .remove = fw_unit_remove, }; EXPORT_SYMBOL(fw_bus_type); int fw_device_enable_phys_dma(struct fw_device *device) { int generation = device->generation; /* device->node_id, accessed below, must not be older than generation */ smp_rmb(); return device->card->driver->enable_phys_dma(device->card, device->node_id, generation); } EXPORT_SYMBOL(fw_device_enable_phys_dma); struct config_rom_attribute { struct device_attribute attr; u32 key; }; static ssize_t show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) { struct config_rom_attribute *attr = container_of(dattr, struct config_rom_attribute, attr); struct fw_csr_iterator ci; const u32 *dir; int key, value, ret = -ENOENT; down_read(&fw_device_rwsem); if (is_fw_unit(dev)) dir = fw_unit(dev)->directory; else dir = fw_device(dev)->config_rom + 5; fw_csr_iterator_init(&ci, dir); while (fw_csr_iterator_next(&ci, &key, &value)) if (attr->key == key) { ret = snprintf(buf, buf ? PAGE_SIZE : 0, "0x%06x\n", value); break; } up_read(&fw_device_rwsem); return ret; } #define IMMEDIATE_ATTR(name, key) \ { __ATTR(name, S_IRUGO, show_immediate, NULL), key } static ssize_t show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) { struct config_rom_attribute *attr = container_of(dattr, struct config_rom_attribute, attr); const u32 *dir; size_t bufsize; char dummy_buf[2]; int ret; down_read(&fw_device_rwsem); if (is_fw_unit(dev)) dir = fw_unit(dev)->directory; else dir = fw_device(dev)->config_rom + 5; if (buf) { bufsize = PAGE_SIZE - 1; } else { buf = dummy_buf; bufsize = 1; } ret = fw_csr_string(dir, attr->key, buf, bufsize); if (ret >= 0) { /* Strip trailing whitespace and add newline. */ while (ret > 0 && isspace(buf[ret - 1])) ret--; strcpy(buf + ret, "\n"); ret++; } up_read(&fw_device_rwsem); return ret; } #define TEXT_LEAF_ATTR(name, key) \ { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } static struct config_rom_attribute config_rom_attributes[] = { IMMEDIATE_ATTR(vendor, CSR_VENDOR), IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), IMMEDIATE_ATTR(version, CSR_VERSION), IMMEDIATE_ATTR(model, CSR_MODEL), TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), TEXT_LEAF_ATTR(model_name, CSR_MODEL), TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), }; static void init_fw_attribute_group(struct device *dev, struct device_attribute *attrs, struct fw_attribute_group *group) { struct device_attribute *attr; int i, j; for (j = 0; attrs[j].attr.name != NULL; j++) group->attrs[j] = &attrs[j].attr; for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { attr = &config_rom_attributes[i].attr; if (attr->show(dev, attr, NULL) < 0) continue; group->attrs[j++] = &attr->attr; } group->attrs[j] = NULL; group->groups[0] = &group->group; group->groups[1] = NULL; group->group.attrs = group->attrs; dev->groups = (const struct attribute_group **) group->groups; } static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { struct fw_unit *unit = fw_unit(dev); int length; length = get_modalias(unit, buf, PAGE_SIZE); strcpy(buf + length, "\n"); return length + 1; } static ssize_t rom_index_show(struct device *dev, struct device_attribute *attr, char *buf) { struct fw_device *device = fw_device(dev->parent); struct fw_unit *unit = fw_unit(dev); return snprintf(buf, PAGE_SIZE, "%d\n", (int)(unit->directory - device->config_rom)); } static struct device_attribute fw_unit_attributes[] = { __ATTR_RO(modalias), __ATTR_RO(rom_index), __ATTR_NULL, }; static ssize_t config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) { struct fw_device *device = fw_device(dev); size_t length; down_read(&fw_device_rwsem); length = device->config_rom_length * 4; memcpy(buf, device->config_rom, length); up_read(&fw_device_rwsem); return length; } static ssize_t guid_show(struct device *dev, struct device_attribute *attr, char *buf) { struct fw_device *device = fw_device(dev); int ret; down_read(&fw_device_rwsem); ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", device->config_rom[3], device->config_rom[4]); up_read(&fw_device_rwsem); return ret; } static ssize_t is_local_show(struct device *dev, struct device_attribute *attr, char *buf) { struct fw_device *device = fw_device(dev); return sprintf(buf, "%u\n", device->is_local); } static int units_sprintf(char *buf, const u32 *directory) { struct fw_csr_iterator ci; int key, value; int specifier_id = 0; int version = 0; fw_csr_iterator_init(&ci, directory); while (fw_csr_iterator_next(&ci, &key, &value)) { switch (key) { case CSR_SPECIFIER_ID: specifier_id = value; break; case CSR_VERSION: version = value; break; } } return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version); } static ssize_t units_show(struct device *dev, struct device_attribute *attr, char *buf) { struct fw_device *device = fw_device(dev); struct fw_csr_iterator ci; int key, value, i = 0; down_read(&fw_device_rwsem); fw_csr_iterator_init(&ci, &device->config_rom[5]); while (fw_csr_iterator_next(&ci, &key, &value)) { if (key != (CSR_UNIT | CSR_DIRECTORY)) continue; i += units_sprintf(&buf[i], ci.p + value - 1); if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) break; } up_read(&fw_device_rwsem); if (i) buf[i - 1] = '\n'; return i; } static struct device_attribute fw_device_attributes[] = { __ATTR_RO(config_rom), __ATTR_RO(guid), __ATTR_RO(is_local), __ATTR_RO(units), __ATTR_NULL, }; static int read_rom(struct fw_device *device, int generation, int index, u32 *data) { u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4; int i, rcode; /* device->node_id, accessed below, must not be older than generation */ smp_rmb(); for (i = 10; i < 100; i += 10) { rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, device->node_id, generation, device->max_speed, offset, data, 4); if (rcode != RCODE_BUSY) break; msleep(i); } be32_to_cpus(data); return rcode; } #define MAX_CONFIG_ROM_SIZE 256 /* * Read the bus info block, perform a speed probe, and read all of the rest of