Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ALSA sequencer device management |
| 3 | * Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | * |
| 19 | * |
| 20 | *---------------------------------------------------------------- |
| 21 | * |
| 22 | * This device handler separates the card driver module from sequencer |
| 23 | * stuff (sequencer core, synth drivers, etc), so that user can avoid |
| 24 | * to spend unnecessary resources e.g. if he needs only listening to |
| 25 | * MP3s. |
| 26 | * |
| 27 | * The card (or lowlevel) driver creates a sequencer device entry |
| 28 | * via snd_seq_device_new(). This is an entry pointer to communicate |
| 29 | * with the sequencer device "driver", which is involved with the |
| 30 | * actual part to communicate with the sequencer core. |
| 31 | * Each sequencer device entry has an id string and the corresponding |
| 32 | * driver with the same id is loaded when required. For example, |
| 33 | * lowlevel codes to access emu8000 chip on sbawe card are included in |
| 34 | * emu8000-synth module. To activate this module, the hardware |
| 35 | * resources like i/o port are passed via snd_seq_device argument. |
| 36 | * |
| 37 | */ |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/init.h> |
| 40 | #include <sound/core.h> |
| 41 | #include <sound/info.h> |
| 42 | #include <sound/seq_device.h> |
| 43 | #include <sound/seq_kernel.h> |
| 44 | #include <sound/initval.h> |
| 45 | #include <linux/kmod.h> |
| 46 | #include <linux/slab.h> |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 47 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); |
| 50 | MODULE_DESCRIPTION("ALSA sequencer device management"); |
| 51 | MODULE_LICENSE("GPL"); |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | /* driver state */ |
| 54 | #define DRIVER_EMPTY 0 |
| 55 | #define DRIVER_LOADED (1<<0) |
| 56 | #define DRIVER_REQUESTED (1<<1) |
| 57 | #define DRIVER_LOCKED (1<<2) |
| 58 | |
| 59 | struct ops_list { |
| 60 | char id[ID_LEN]; /* driver id */ |
| 61 | int driver; /* driver state */ |
| 62 | int used; /* reference counter */ |
| 63 | int argsize; /* argument size */ |
| 64 | |
| 65 | /* operators */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 66 | struct snd_seq_dev_ops ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | /* registred devices */ |
| 69 | struct list_head dev_list; /* list of devices */ |
| 70 | int num_devices; /* number of associated devices */ |
| 71 | int num_init_devices; /* number of initialized devices */ |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 72 | struct mutex reg_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | struct list_head list; /* next driver */ |
| 75 | }; |
| 76 | |
| 77 | |
| 78 | static LIST_HEAD(opslist); |
| 79 | static int num_ops; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 80 | static DEFINE_MUTEX(ops_mutex); |
Takashi Iwai | 04f141a | 2005-12-01 10:43:51 +0100 | [diff] [blame] | 81 | #ifdef CONFIG_PROC_FS |
Takashi Iwai | 6581f4e | 2006-05-17 17:14:51 +0200 | [diff] [blame] | 82 | static struct snd_info_entry *info_entry; |
Takashi Iwai | 04f141a | 2005-12-01 10:43:51 +0100 | [diff] [blame] | 83 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | /* |
| 86 | * prototypes |
| 87 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 88 | static int snd_seq_device_free(struct snd_seq_device *dev); |
| 89 | static int snd_seq_device_dev_free(struct snd_device *device); |
| 90 | static int snd_seq_device_dev_register(struct snd_device *device); |
| 91 | static int snd_seq_device_dev_disconnect(struct snd_device *device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 93 | static int init_device(struct snd_seq_device *dev, struct ops_list *ops); |
| 94 | static int free_device(struct snd_seq_device *dev, struct ops_list *ops); |
| 95 | static struct ops_list *find_driver(char *id, int create_if_empty); |
| 96 | static struct ops_list *create_driver(char *id); |
| 97 | static void unlock_driver(struct ops_list *ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | static void remove_drivers(void); |
| 99 | |
| 100 | /* |
| 101 | * show all drivers and their status |
| 102 | */ |
| 103 | |
Takashi Iwai | 04f141a | 2005-12-01 10:43:51 +0100 | [diff] [blame] | 104 | #ifdef CONFIG_PROC_FS |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 105 | static void snd_seq_device_info(struct snd_info_entry *entry, |
| 106 | struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 108 | struct ops_list *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 110 | mutex_lock(&ops_mutex); |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 111 | list_for_each_entry(ops, &opslist, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | snd_iprintf(buffer, "snd-%s%s%s%s,%d\n", |
| 113 | ops->id, |
| 114 | ops->driver & DRIVER_LOADED ? ",loaded" : (ops->driver == DRIVER_EMPTY ? ",empty" : ""), |
| 115 | ops->driver & DRIVER_REQUESTED ? ",requested" : "", |
| 116 | ops->driver & DRIVER_LOCKED ? ",locked" : "", |
| 117 | ops->num_devices); |
| 118 | } |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 119 | mutex_unlock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
Takashi Iwai | 04f141a | 2005-12-01 10:43:51 +0100 | [diff] [blame] | 121 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
| 123 | /* |
| 124 | * load all registered drivers (called from seq_clientmgr.c) |
| 125 | */ |
| 126 | |
Johannes Berg | ee2da99 | 2008-07-09 10:28:41 +0200 | [diff] [blame] | 127 | #ifdef CONFIG_MODULES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | /* avoid auto-loading during module_init() */ |
| 129 | static int snd_seq_in_init; |
| 130 | void snd_seq_autoload_lock(void) |
| 131 | { |
| 132 | snd_seq_in_init++; |
| 133 | } |
| 134 | |
| 135 | void snd_seq_autoload_unlock(void) |
| 136 | { |
| 137 | snd_seq_in_init--; |
| 138 | } |
| 139 | #endif |
| 140 | |
| 141 | void snd_seq_device_load_drivers(void) |
| 142 | { |
Johannes Berg | ee2da99 | 2008-07-09 10:28:41 +0200 | [diff] [blame] | 143 | #ifdef CONFIG_MODULES |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 144 | struct ops_list *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
| 146 | /* Calling request_module during module_init() |
| 147 | * may cause blocking. |
| 148 | */ |
| 149 | if (snd_seq_in_init) |
| 150 | return; |
| 151 | |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 152 | mutex_lock(&ops_mutex); |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 153 | list_for_each_entry(ops, &opslist, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | if (! (ops->driver & DRIVER_LOADED) && |
| 155 | ! (ops->driver & DRIVER_REQUESTED)) { |
| 156 | ops->used++; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 157 | mutex_unlock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | ops->driver |= DRIVER_REQUESTED; |
| 159 | request_module("snd-%s", ops->id); |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 160 | mutex_lock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | ops->used--; |
| 162 | } |
| 163 | } |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 164 | mutex_unlock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | #endif |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * register a sequencer device |
| 170 | * card = card info (NULL allowed) |
| 171 | * device = device number (if any) |
| 172 | * id = id of driver |
| 173 | * result = return pointer (NULL allowed if unnecessary) |
| 174 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 175 | int snd_seq_device_new(struct snd_card *card, int device, char *id, int argsize, |
| 176 | struct snd_seq_device **result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 178 | struct snd_seq_device *dev; |
| 179 | struct ops_list *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | int err; |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 181 | static struct snd_device_ops dops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | .dev_free = snd_seq_device_dev_free, |
| 183 | .dev_register = snd_seq_device_dev_register, |
| 184 | .dev_disconnect = snd_seq_device_dev_disconnect, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | }; |
| 186 | |
| 187 | if (result) |
| 188 | *result = NULL; |
| 189 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 190 | if (snd_BUG_ON(!id)) |
| 191 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
| 193 | ops = find_driver(id, 1); |
| 194 | if (ops == NULL) |
| 195 | return -ENOMEM; |
| 196 | |
Takashi Iwai | ecca82b | 2005-09-09 14:20:49 +0200 | [diff] [blame] | 197 | dev = kzalloc(sizeof(*dev)*2 + argsize, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | if (dev == NULL) { |
| 199 | unlock_driver(ops); |
| 200 | return -ENOMEM; |
| 201 | } |
| 202 | |
| 203 | /* set up device info */ |
| 204 | dev->card = card; |
| 205 | dev->device = device; |
| 206 | strlcpy(dev->id, id, sizeof(dev->id)); |
| 207 | dev->argsize = argsize; |
| 208 | dev->status = SNDRV_SEQ_DEVICE_FREE; |
| 209 | |
| 210 | /* add this device to the list */ |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 211 | mutex_lock(&ops->reg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | list_add_tail(&dev->list, &ops->dev_list); |
| 213 | ops->num_devices++; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 214 | mutex_unlock(&ops->reg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
| 216 | unlock_driver(ops); |
| 217 | |
| 218 | if ((err = snd_device_new(card, SNDRV_DEV_SEQUENCER, dev, &dops)) < 0) { |
| 219 | snd_seq_device_free(dev); |
| 220 | return err; |
| 221 | } |
| 222 | |
| 223 | if (result) |
| 224 | *result = dev; |
| 225 | |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * free the existing device |
| 231 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 232 | static int snd_seq_device_free(struct snd_seq_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 234 | struct ops_list *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 236 | if (snd_BUG_ON(!dev)) |
| 237 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | ops = find_driver(dev->id, 0); |
| 240 | if (ops == NULL) |
| 241 | return -ENXIO; |
| 242 | |
| 243 | /* remove the device from the list */ |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 244 | mutex_lock(&ops->reg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | list_del(&dev->list); |
| 246 | ops->num_devices--; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 247 | mutex_unlock(&ops->reg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
| 249 | free_device(dev, ops); |
| 250 | if (dev->private_free) |
| 251 | dev->private_free(dev); |
| 252 | kfree(dev); |
| 253 | |
| 254 | unlock_driver(ops); |
| 255 | |
| 256 | return 0; |
| 257 | } |
| 258 | |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 259 | static int snd_seq_device_dev_free(struct snd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 261 | struct snd_seq_device *dev = device->device_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | return snd_seq_device_free(dev); |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * register the device |
| 267 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 268 | static int snd_seq_device_dev_register(struct snd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 270 | struct snd_seq_device *dev = device->device_data; |
| 271 | struct ops_list *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | ops = find_driver(dev->id, 0); |
| 274 | if (ops == NULL) |
| 275 | return -ENOENT; |
| 276 | |
| 277 | /* initialize this device if the corresponding driver was |
| 278 | * already loaded |
| 279 | */ |
| 280 | if (ops->driver & DRIVER_LOADED) |
| 281 | init_device(dev, ops); |
| 282 | |
| 283 | unlock_driver(ops); |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * disconnect the device |
| 289 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 290 | static int snd_seq_device_dev_disconnect(struct snd_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 292 | struct snd_seq_device *dev = device->device_data; |
| 293 | struct ops_list *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
| 295 | ops = find_driver(dev->id, 0); |
| 296 | if (ops == NULL) |
| 297 | return -ENOENT; |
| 298 | |
| 299 | free_device(dev, ops); |
| 300 | |
| 301 | unlock_driver(ops); |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | * register device driver |
| 307 | * id = driver id |
| 308 | * entry = driver operators - duplicated to each instance |
| 309 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 310 | int snd_seq_device_register_driver(char *id, struct snd_seq_dev_ops *entry, |
| 311 | int argsize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 313 | struct ops_list *ops; |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 314 | struct snd_seq_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
| 316 | if (id == NULL || entry == NULL || |
| 317 | entry->init_device == NULL || entry->free_device == NULL) |
| 318 | return -EINVAL; |
| 319 | |
| 320 | snd_seq_autoload_lock(); |
| 321 | ops = find_driver(id, 1); |
| 322 | if (ops == NULL) { |
| 323 | snd_seq_autoload_unlock(); |
| 324 | return -ENOMEM; |
| 325 | } |
| 326 | if (ops->driver & DRIVER_LOADED) { |
| 327 | snd_printk(KERN_WARNING "driver_register: driver '%s' already exists\n", id); |
| 328 | unlock_driver(ops); |
| 329 | snd_seq_autoload_unlock(); |
| 330 | return -EBUSY; |
| 331 | } |
| 332 | |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 333 | mutex_lock(&ops->reg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | /* copy driver operators */ |
| 335 | ops->ops = *entry; |
| 336 | ops->driver |= DRIVER_LOADED; |
| 337 | ops->argsize = argsize; |
| 338 | |
| 339 | /* initialize existing devices if necessary */ |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 340 | list_for_each_entry(dev, &ops->dev_list, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | init_device(dev, ops); |
| 342 | } |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 343 | mutex_unlock(&ops->reg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
| 345 | unlock_driver(ops); |
| 346 | snd_seq_autoload_unlock(); |
| 347 | |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | |
| 352 | /* |
| 353 | * create driver record |
| 354 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 355 | static struct ops_list * create_driver(char *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 357 | struct ops_list *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Panagiotis Issaris | 59feddb | 2006-07-25 15:28:03 +0200 | [diff] [blame] | 359 | ops = kzalloc(sizeof(*ops), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | if (ops == NULL) |
| 361 | return ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | /* set up driver entry */ |
| 364 | strlcpy(ops->id, id, sizeof(ops->id)); |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 365 | mutex_init(&ops->reg_mutex); |
Arjan van de Ven | 933a2ef | 2006-07-03 00:25:22 -0700 | [diff] [blame] | 366 | /* |
| 367 | * The ->reg_mutex locking rules are per-driver, so we create |
| 368 | * separate per-driver lock classes: |
| 369 | */ |
| 370 | lockdep_set_class(&ops->reg_mutex, (struct lock_class_key *)id); |
| 371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | ops->driver = DRIVER_EMPTY; |
| 373 | INIT_LIST_HEAD(&ops->dev_list); |
| 374 | /* lock this instance */ |
| 375 | ops->used = 1; |
| 376 | |
| 377 | /* register driver entry */ |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 378 | mutex_lock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | list_add_tail(&ops->list, &opslist); |
| 380 | num_ops++; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 381 | mutex_unlock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
| 383 | return ops; |
| 384 | } |
| 385 | |
| 386 | |
| 387 | /* |
| 388 | * unregister the specified driver |
| 389 | */ |
| 390 | int snd_seq_device_unregister_driver(char *id) |
| 391 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 392 | struct ops_list *ops; |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 393 | struct snd_seq_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | ops = find_driver(id, 0); |
| 396 | if (ops == NULL) |
| 397 | return -ENXIO; |
| 398 | if (! (ops->driver & DRIVER_LOADED) || |
| 399 | (ops->driver & DRIVER_LOCKED)) { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 400 | snd_printk(KERN_ERR "driver_unregister: cannot unload driver '%s': status=%x\n", |
| 401 | id, ops->driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | unlock_driver(ops); |
| 403 | return -EBUSY; |
| 404 | } |
| 405 | |
| 406 | /* close and release all devices associated with this driver */ |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 407 | mutex_lock(&ops->reg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | ops->driver |= DRIVER_LOCKED; /* do not remove this driver recursively */ |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 409 | list_for_each_entry(dev, &ops->dev_list, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | free_device(dev, ops); |
| 411 | } |
| 412 | |
| 413 | ops->driver = 0; |
| 414 | if (ops->num_init_devices > 0) |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 415 | snd_printk(KERN_ERR "free_driver: init_devices > 0!! (%d)\n", |
| 416 | ops->num_init_devices); |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 417 | mutex_unlock(&ops->reg_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | |
| 419 | unlock_driver(ops); |
| 420 | |
| 421 | /* remove empty driver entries */ |
| 422 | remove_drivers(); |
| 423 | |
| 424 | return 0; |
| 425 | } |
| 426 | |
| 427 | |
| 428 | /* |
| 429 | * remove empty driver entries |
| 430 | */ |
| 431 | static void remove_drivers(void) |
| 432 | { |
| 433 | struct list_head *head; |
| 434 | |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 435 | mutex_lock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | head = opslist.next; |
| 437 | while (head != &opslist) { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 438 | struct ops_list *ops = list_entry(head, struct ops_list, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | if (! (ops->driver & DRIVER_LOADED) && |
| 440 | ops->used == 0 && ops->num_devices == 0) { |
| 441 | head = head->next; |
| 442 | list_del(&ops->list); |
| 443 | kfree(ops); |
| 444 | num_ops--; |
| 445 | } else |
| 446 | head = head->next; |
| 447 | } |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 448 | mutex_unlock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | /* |
| 452 | * initialize the device - call init_device operator |
| 453 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 454 | static int init_device(struct snd_seq_device *dev, struct ops_list *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | { |
| 456 | if (! (ops->driver & DRIVER_LOADED)) |
| 457 | return 0; /* driver is not loaded yet */ |
| 458 | if (dev->status != SNDRV_SEQ_DEVICE_FREE) |
| 459 | return 0; /* already initialized */ |
| 460 | if (ops->argsize != dev->argsize) { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 461 | snd_printk(KERN_ERR "incompatible device '%s' for plug-in '%s' (%d %d)\n", |
| 462 | dev->name, ops->id, ops->argsize, dev->argsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | return -EINVAL; |
| 464 | } |
| 465 | if (ops->ops.init_device(dev) >= 0) { |
| 466 | dev->status = SNDRV_SEQ_DEVICE_REGISTERED; |
| 467 | ops->num_init_devices++; |
| 468 | } else { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 469 | snd_printk(KERN_ERR "init_device failed: %s: %s\n", |
| 470 | dev->name, dev->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
| 472 | |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * release the device - call free_device operator |
| 478 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 479 | static int free_device(struct snd_seq_device *dev, struct ops_list *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | { |
| 481 | int result; |
| 482 | |
| 483 | if (! (ops->driver & DRIVER_LOADED)) |
| 484 | return 0; /* driver is not loaded yet */ |
| 485 | if (dev->status != SNDRV_SEQ_DEVICE_REGISTERED) |
| 486 | return 0; /* not registered */ |
| 487 | if (ops->argsize != dev->argsize) { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 488 | snd_printk(KERN_ERR "incompatible device '%s' for plug-in '%s' (%d %d)\n", |
| 489 | dev->name, ops->id, ops->argsize, dev->argsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | return -EINVAL; |
| 491 | } |
| 492 | if ((result = ops->ops.free_device(dev)) >= 0 || result == -ENXIO) { |
| 493 | dev->status = SNDRV_SEQ_DEVICE_FREE; |
| 494 | dev->driver_data = NULL; |
| 495 | ops->num_init_devices--; |
| 496 | } else { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 497 | snd_printk(KERN_ERR "free_device failed: %s: %s\n", |
| 498 | dev->name, dev->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * find the matching driver with given id |
| 506 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 507 | static struct ops_list * find_driver(char *id, int create_if_empty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | { |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 509 | struct ops_list *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 511 | mutex_lock(&ops_mutex); |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 512 | list_for_each_entry(ops, &opslist, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | if (strcmp(ops->id, id) == 0) { |
| 514 | ops->used++; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 515 | mutex_unlock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | return ops; |
| 517 | } |
| 518 | } |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 519 | mutex_unlock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | if (create_if_empty) |
| 521 | return create_driver(id); |
| 522 | return NULL; |
| 523 | } |
| 524 | |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 525 | static void unlock_driver(struct ops_list *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | { |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 527 | mutex_lock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | ops->used--; |
Ingo Molnar | 1a60d4c | 2006-01-16 16:29:08 +0100 | [diff] [blame] | 529 | mutex_unlock(&ops_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | } |
| 531 | |
| 532 | |
| 533 | /* |
| 534 | * module part |
| 535 | */ |
| 536 | |
| 537 | static int __init alsa_seq_device_init(void) |
| 538 | { |
Takashi Iwai | 04f141a | 2005-12-01 10:43:51 +0100 | [diff] [blame] | 539 | #ifdef CONFIG_PROC_FS |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 540 | info_entry = snd_info_create_module_entry(THIS_MODULE, "drivers", |
| 541 | snd_seq_root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | if (info_entry == NULL) |
| 543 | return -ENOMEM; |
| 544 | info_entry->content = SNDRV_INFO_CONTENT_TEXT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | info_entry->c.text.read = snd_seq_device_info; |
| 546 | if (snd_info_register(info_entry) < 0) { |
| 547 | snd_info_free_entry(info_entry); |
| 548 | return -ENOMEM; |
| 549 | } |
Takashi Iwai | 04f141a | 2005-12-01 10:43:51 +0100 | [diff] [blame] | 550 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | return 0; |
| 552 | } |
| 553 | |
| 554 | static void __exit alsa_seq_device_exit(void) |
| 555 | { |
| 556 | remove_drivers(); |
Takashi Iwai | 04f141a | 2005-12-01 10:43:51 +0100 | [diff] [blame] | 557 | #ifdef CONFIG_PROC_FS |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 558 | snd_info_free_entry(info_entry); |
Takashi Iwai | 04f141a | 2005-12-01 10:43:51 +0100 | [diff] [blame] | 559 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | if (num_ops) |
| 561 | snd_printk(KERN_ERR "drivers not released (%d)\n", num_ops); |
| 562 | } |
| 563 | |
| 564 | module_init(alsa_seq_device_init) |
| 565 | module_exit(alsa_seq_device_exit) |
| 566 | |
| 567 | EXPORT_SYMBOL(snd_seq_device_load_drivers); |
| 568 | EXPORT_SYMBOL(snd_seq_device_new); |
| 569 | EXPORT_SYMBOL(snd_seq_device_register_driver); |
| 570 | EXPORT_SYMBOL(snd_seq_device_unregister_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | EXPORT_SYMBOL(snd_seq_autoload_lock); |
| 572 | EXPORT_SYMBOL(snd_seq_autoload_unlock); |