LXR linux/drivers/firewire/fw-device.h

   1/*
   2 * Copyright (C) 2005-2006  Kristian Hoegsberg <krh@bitplanet.net>
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; either version 2 of the License, or
   7 * (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software Foundation,
  16 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17 */
  18
  19#ifndef __fw_device_h
  20#define __fw_device_h
  21
  22#include <linux/fs.h>
  23#include <linux/cdev.h>
  24#include <linux/rwsem.h>
  25#include <asm/atomic.h>
  26
  27enum fw_device_state {
  28        FW_DEVICE_INITIALIZING,
  29        FW_DEVICE_RUNNING,
  30        FW_DEVICE_SHUTDOWN,
  31};
  32
  33struct fw_attribute_group {
  34        struct attribute_group *groups[2];
  35        struct attribute_group group;
  36        struct attribute *attrs[11];
  37};
  38
  39/*
  40 * Note, fw_device.generation always has to be read before fw_device.node_id.
  41 * Use SMP memory barriers to ensure this.  Otherwise requests will be sent
  42 * to an outdated node_id if the generation was updated in the meantime due
  43 * to a bus reset.
  44 *
  45 * Likewise, fw-core will take care to update .node_id before .generation so
  46 * that whenever fw_device.generation is current WRT the actual bus generation,
  47 * fw_device.node_id is guaranteed to be current too.
  48 *
  49 * The same applies to fw_device.card->node_id vs. fw_device.generation.
  50 *
  51 * fw_device.config_rom and fw_device.config_rom_length may be accessed during
  52 * the lifetime of any fw_unit belonging to the fw_device, before device_del()
  53 * was called on the last fw_unit.  Alternatively, they may be accessed while
  54 * holding fw_device_rwsem.
  55 */
  56struct fw_device {
  57        atomic_t state;
  58        struct fw_node *node;
  59        int node_id;
  60        int generation;
  61        unsigned max_speed;
  62        bool cmc;
  63        struct fw_card *card;
  64        struct device device;
  65        struct list_head link;
  66        struct list_head client_list;
  67        u32 *config_rom;
  68        size_t config_rom_length;
  69        int config_rom_retries;
  70        struct delayed_work work;
  71        struct fw_attribute_group attribute_group;
  72};
  73
  74static inline struct fw_device *fw_device(struct device *dev)
  75{
  76        return container_of(dev, struct fw_device, device);
  77}
  78
  79static inline int fw_device_is_shutdown(struct fw_device *device)
  80{
  81        return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
  82}
  83
  84static inline struct fw_device *fw_device_get(struct fw_device *device)
  85{
  86        get_device(&device->device);
  87
  88        return device;
  89}
  90
  91static inline void fw_device_put(struct fw_device *device)
  92{
  93        put_device(&device->device);
  94}
  95
  96struct fw_device *fw_device_get_by_devt(dev_t devt);
  97int fw_device_enable_phys_dma(struct fw_device *device);
  98
  99void fw_device_cdev_update(struct fw_device *device);
 100void fw_device_cdev_remove(struct fw_device *device);
 101
 102extern struct rw_semaphore fw_device_rwsem;
 103extern int fw_cdev_major;
 104
 105/*
 106 * fw_unit.directory must not be accessed after device_del(&fw_unit.device).
 107 */
 108struct fw_unit {
 109        struct device device;
 110        u32 *directory;
 111        struct fw_attribute_group attribute_group;
 112};
 113
 114static inline struct fw_unit *fw_unit(struct device *dev)
 115{
 116        return container_of(dev, struct fw_unit, device);
 117}
 118
 119static inline struct fw_unit *fw_unit_get(struct fw_unit *unit)
 120{
 121        get_device(&unit->device);
 122
 123        return unit;
 124}
 125
 126static inline void fw_unit_put(struct fw_unit *unit)
 127{
 128        put_device(&unit->device);
 129}
 130
 131#define CSR_OFFSET      0x40
 132#define CSR_LEAF        0x80
 133#define CSR_DIRECTORY   0xc0
 134
 135#define CSR_DESCRIPTOR          0x01
 136#define CSR_VENDOR              0x03
 137#define CSR_HARDWARE_VERSION    0x04
 138#define CSR_NODE_CAPABILITIES   0x0c
 139#define CSR_UNIT                0x11
 140#define CSR_SPECIFIER_ID        0x12
 141#define CSR_VERSION             0x13
 142#define CSR_DEPENDENT_INFO      0x14
 143#define CSR_MODEL               0x17
 144#define CSR_INSTANCE            0x18
 145#define CSR_DIRECTORY_ID        0x20
 146
 147struct fw_csr_iterator {
 148        u32 *p;
 149        u32 *end;
 150};
 151
 152void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 *p);
 153int fw_csr_iterator_next(struct fw_csr_iterator *ci,
 154                         int *key, int *value);
 155
 156#define FW_MATCH_VENDOR         0x0001
 157#define FW_MATCH_MODEL          0x0002
 158#define FW_MATCH_SPECIFIER_ID   0x0004
 159#define FW_MATCH_VERSION        0x0008
 160
 161struct fw_device_id {
 162        u32 match_flags;
 163        u32 vendor;
 164        u32 model;
 165        u32 specifier_id;
 166        u32 version;
 167        void *driver_data;
 168};
 169
 170struct fw_driver {
 171        struct device_driver driver;
 172        /* Called when the parent device sits through a bus reset. */
 173        void (*update) (struct fw_unit *unit);
 174        const struct fw_device_id *id_table;
 175};
 176
 177static inline struct fw_driver *
 178fw_driver(struct device_driver *drv)
 179{
 180        return container_of(drv, struct fw_driver, driver);
 181}
 182
 183extern const struct file_operations fw_device_ops;
 184
 185#endif /* __fw_device_h */
 186