Satya Durga Srinivasu Prabhala | 377d32f | 2017-03-15 11:09:28 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2013-2015, 2017, The Linux Foundation. All rights reserved. |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/idr.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include "esoc.h" |
| 16 | |
| 17 | static DEFINE_IDA(esoc_ida); |
| 18 | |
| 19 | /* SYSFS */ |
| 20 | static ssize_t |
| 21 | esoc_name_show(struct device *dev, struct device_attribute *attr, |
| 22 | char *buf) |
| 23 | { |
| 24 | return snprintf(buf, ESOC_NAME_LEN, "%s", to_esoc_clink(dev)->name); |
| 25 | } |
| 26 | |
| 27 | static ssize_t |
| 28 | esoc_link_show(struct device *dev, struct device_attribute *attr, |
| 29 | char *buf) |
| 30 | { |
| 31 | return snprintf(buf, ESOC_LINK_LEN, "%s", |
| 32 | to_esoc_clink(dev)->link_name); |
| 33 | } |
| 34 | |
Satya Durga Srinivasu Prabhala | b8a2a4e | 2017-03-14 16:51:50 -0700 | [diff] [blame] | 35 | static ssize_t |
| 36 | esoc_link_info_show(struct device *dev, struct device_attribute *attr, |
| 37 | char *buf) |
| 38 | { |
| 39 | return snprintf(buf, ESOC_LINK_LEN, "%s", |
| 40 | to_esoc_clink(dev)->link_info); |
| 41 | } |
| 42 | |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 43 | static struct device_attribute esoc_clink_attrs[] = { |
| 44 | |
| 45 | __ATTR_RO(esoc_name), |
| 46 | __ATTR_RO(esoc_link), |
Satya Durga Srinivasu Prabhala | b8a2a4e | 2017-03-14 16:51:50 -0700 | [diff] [blame] | 47 | __ATTR_RO(esoc_link_info), |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 48 | __ATTR_NULL, |
| 49 | }; |
| 50 | |
| 51 | static int esoc_bus_match(struct device *dev, struct device_driver *drv) |
| 52 | { |
| 53 | int i = 0, match = 1; |
| 54 | struct esoc_clink *esoc_clink = to_esoc_clink(dev); |
| 55 | struct esoc_drv *esoc_drv = to_esoc_drv(drv); |
| 56 | int entries = esoc_drv->compat_entries; |
| 57 | struct esoc_compat *table = esoc_drv->compat_table; |
| 58 | |
| 59 | for (i = 0; i < entries; i++) { |
| 60 | if (strcasecmp(esoc_clink->name, table[i].name) == 0) |
| 61 | return match; |
| 62 | } |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static int esoc_bus_probe(struct device *dev) |
| 67 | { |
| 68 | int ret; |
| 69 | struct esoc_clink *esoc_clink = to_esoc_clink(dev); |
| 70 | struct esoc_drv *esoc_drv = to_esoc_drv(dev->driver); |
| 71 | |
| 72 | ret = esoc_drv->probe(esoc_clink, esoc_drv); |
| 73 | if (ret) { |
| 74 | pr_err("failed to probe %s dev\n", esoc_clink->name); |
| 75 | return ret; |
| 76 | } |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | struct bus_type esoc_bus_type = { |
| 81 | .name = "esoc", |
| 82 | .match = esoc_bus_match, |
| 83 | .dev_attrs = esoc_clink_attrs, |
| 84 | }; |
| 85 | EXPORT_SYMBOL(esoc_bus_type); |
| 86 | |
| 87 | struct device esoc_bus = { |
| 88 | .init_name = "esoc-bus" |
| 89 | }; |
| 90 | EXPORT_SYMBOL(esoc_bus); |
| 91 | |
| 92 | /* bus accessor */ |
| 93 | static void esoc_clink_release(struct device *dev) |
| 94 | { |
| 95 | struct esoc_clink *esoc_clink = to_esoc_clink(dev); |
| 96 | |
| 97 | ida_simple_remove(&esoc_ida, esoc_clink->id); |
| 98 | kfree(esoc_clink); |
| 99 | } |
| 100 | |
| 101 | static int esoc_clink_match_id(struct device *dev, void *id) |
| 102 | { |
| 103 | struct esoc_clink *esoc_clink = to_esoc_clink(dev); |
| 104 | int *esoc_id = (int *)id; |
| 105 | |
| 106 | if (esoc_clink->id == *esoc_id) { |
| 107 | if (!try_module_get(esoc_clink->owner)) |
| 108 | return 0; |
| 109 | return 1; |
| 110 | } |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | static int esoc_clink_match_node(struct device *dev, void *id) |
| 115 | { |
| 116 | struct esoc_clink *esoc_clink = to_esoc_clink(dev); |
| 117 | struct device_node *node = id; |
| 118 | |
| 119 | if (esoc_clink->np == node) { |
| 120 | if (!try_module_get(esoc_clink->owner)) |
| 121 | return 0; |
| 122 | return 1; |
| 123 | } |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | void esoc_for_each_dev(void *data, int (*fn)(struct device *dev, void *)) |
| 128 | { |
| 129 | int ret; |
| 130 | |
| 131 | ret = bus_for_each_dev(&esoc_bus_type, NULL, data, fn); |
| 132 | } |
| 133 | EXPORT_SYMBOL(esoc_for_each_dev); |
| 134 | |
| 135 | struct esoc_clink *get_esoc_clink(int id) |
| 136 | { |
| 137 | struct esoc_clink *esoc_clink; |
| 138 | struct device *dev; |
| 139 | |
| 140 | dev = bus_find_device(&esoc_bus_type, NULL, &id, esoc_clink_match_id); |
Satya Durga Srinivasu Prabhala | 377d32f | 2017-03-15 11:09:28 -0700 | [diff] [blame] | 141 | if (IS_ERR_OR_NULL(dev)) |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 142 | return NULL; |
| 143 | esoc_clink = to_esoc_clink(dev); |
| 144 | return esoc_clink; |
| 145 | } |
| 146 | EXPORT_SYMBOL(get_esoc_clink); |
| 147 | |
| 148 | struct esoc_clink *get_esoc_clink_by_node(struct device_node *node) |
| 149 | { |
| 150 | struct esoc_clink *esoc_clink; |
| 151 | struct device *dev; |
| 152 | |
| 153 | dev = bus_find_device(&esoc_bus_type, NULL, node, |
| 154 | esoc_clink_match_node); |
Satya Durga Srinivasu Prabhala | 377d32f | 2017-03-15 11:09:28 -0700 | [diff] [blame] | 155 | if (IS_ERR_OR_NULL(dev)) |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 156 | return NULL; |
| 157 | esoc_clink = to_esoc_clink(dev); |
| 158 | return esoc_clink; |
| 159 | } |
| 160 | |
| 161 | void put_esoc_clink(struct esoc_clink *esoc_clink) |
| 162 | { |
| 163 | module_put(esoc_clink->owner); |
| 164 | } |
| 165 | EXPORT_SYMBOL(put_esoc_clink); |
| 166 | |
| 167 | bool esoc_req_eng_enabled(struct esoc_clink *esoc_clink) |
| 168 | { |
| 169 | return !esoc_clink->req_eng ? false : true; |
| 170 | } |
| 171 | EXPORT_SYMBOL(esoc_req_eng_enabled); |
| 172 | |
| 173 | bool esoc_cmd_eng_enabled(struct esoc_clink *esoc_clink) |
| 174 | { |
| 175 | return !esoc_clink->cmd_eng ? false : true; |
| 176 | } |
| 177 | EXPORT_SYMBOL(esoc_cmd_eng_enabled); |
| 178 | /* ssr operations */ |
| 179 | int esoc_clink_register_ssr(struct esoc_clink *esoc_clink) |
| 180 | { |
| 181 | int ret; |
| 182 | int len; |
| 183 | char *subsys_name; |
| 184 | |
| 185 | len = strlen("esoc") + sizeof(esoc_clink->id); |
| 186 | subsys_name = kzalloc(len, GFP_KERNEL); |
Satya Durga Srinivasu Prabhala | 377d32f | 2017-03-15 11:09:28 -0700 | [diff] [blame] | 187 | if (IS_ERR_OR_NULL(subsys_name)) |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 188 | return PTR_ERR(subsys_name); |
| 189 | snprintf(subsys_name, len, "esoc%d", esoc_clink->id); |
| 190 | esoc_clink->subsys.name = subsys_name; |
| 191 | esoc_clink->dev.of_node = esoc_clink->np; |
| 192 | esoc_clink->subsys.dev = &esoc_clink->dev; |
| 193 | esoc_clink->subsys_dev = subsys_register(&esoc_clink->subsys); |
Satya Durga Srinivasu Prabhala | 377d32f | 2017-03-15 11:09:28 -0700 | [diff] [blame] | 194 | if (IS_ERR_OR_NULL(esoc_clink->subsys_dev)) { |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 195 | dev_err(&esoc_clink->dev, "failed to register ssr node\n"); |
| 196 | ret = PTR_ERR(esoc_clink->subsys_dev); |
| 197 | goto subsys_err; |
| 198 | } |
| 199 | return 0; |
| 200 | subsys_err: |
| 201 | kfree(subsys_name); |
| 202 | return ret; |
| 203 | } |
| 204 | EXPORT_SYMBOL(esoc_clink_register_ssr); |
| 205 | |
| 206 | void esoc_clink_unregister_ssr(struct esoc_clink *esoc_clink) |
| 207 | { |
| 208 | subsys_unregister(esoc_clink->subsys_dev); |
| 209 | kfree(esoc_clink->subsys.name); |
| 210 | } |
| 211 | EXPORT_SYMBOL(esoc_clink_unregister_ssr); |
| 212 | |
| 213 | int esoc_clink_request_ssr(struct esoc_clink *esoc_clink) |
| 214 | { |
| 215 | subsystem_restart_dev(esoc_clink->subsys_dev); |
| 216 | return 0; |
| 217 | } |
| 218 | EXPORT_SYMBOL(esoc_clink_request_ssr); |
| 219 | |
| 220 | /* bus operations */ |
| 221 | void esoc_clink_evt_notify(enum esoc_evt evt, struct esoc_clink *esoc_clink) |
| 222 | { |
| 223 | unsigned long flags; |
| 224 | |
| 225 | spin_lock_irqsave(&esoc_clink->notify_lock, flags); |
| 226 | notify_esoc_clients(esoc_clink, evt); |
| 227 | if (esoc_clink->req_eng && esoc_clink->req_eng->handle_clink_evt) |
| 228 | esoc_clink->req_eng->handle_clink_evt(evt, esoc_clink->req_eng); |
| 229 | if (esoc_clink->cmd_eng && esoc_clink->cmd_eng->handle_clink_evt) |
| 230 | esoc_clink->cmd_eng->handle_clink_evt(evt, esoc_clink->cmd_eng); |
| 231 | spin_unlock_irqrestore(&esoc_clink->notify_lock, flags); |
| 232 | } |
| 233 | EXPORT_SYMBOL(esoc_clink_evt_notify); |
| 234 | |
| 235 | void *get_esoc_clink_data(struct esoc_clink *esoc) |
| 236 | { |
| 237 | return esoc->clink_data; |
| 238 | } |
| 239 | EXPORT_SYMBOL(get_esoc_clink_data); |
| 240 | |
| 241 | void set_esoc_clink_data(struct esoc_clink *esoc, void *data) |
| 242 | { |
| 243 | esoc->clink_data = data; |
| 244 | } |
| 245 | EXPORT_SYMBOL(set_esoc_clink_data); |
| 246 | |
| 247 | void esoc_clink_queue_request(enum esoc_req req, struct esoc_clink *esoc_clink) |
| 248 | { |
| 249 | unsigned long flags; |
| 250 | struct esoc_eng *req_eng; |
| 251 | |
| 252 | spin_lock_irqsave(&esoc_clink->notify_lock, flags); |
| 253 | if (esoc_clink->req_eng != NULL) { |
| 254 | req_eng = esoc_clink->req_eng; |
| 255 | req_eng->handle_clink_req(req, req_eng); |
| 256 | } |
| 257 | spin_unlock_irqrestore(&esoc_clink->notify_lock, flags); |
| 258 | } |
| 259 | EXPORT_SYMBOL(esoc_clink_queue_request); |
| 260 | |
| 261 | void esoc_set_drv_data(struct esoc_clink *esoc_clink, void *data) |
| 262 | { |
| 263 | dev_set_drvdata(&esoc_clink->dev, data); |
| 264 | } |
| 265 | EXPORT_SYMBOL(esoc_set_drv_data); |
| 266 | |
| 267 | void *esoc_get_drv_data(struct esoc_clink *esoc_clink) |
| 268 | { |
| 269 | return dev_get_drvdata(&esoc_clink->dev); |
| 270 | } |
| 271 | EXPORT_SYMBOL(esoc_get_drv_data); |
| 272 | |
| 273 | /* bus registration functions */ |
| 274 | void esoc_clink_unregister(struct esoc_clink *esoc_clink) |
| 275 | { |
| 276 | if (get_device(&esoc_clink->dev) != NULL) { |
| 277 | device_unregister(&esoc_clink->dev); |
| 278 | put_device(&esoc_clink->dev); |
| 279 | } |
| 280 | } |
| 281 | EXPORT_SYMBOL(esoc_clink_unregister); |
| 282 | |
| 283 | int esoc_clink_register(struct esoc_clink *esoc_clink) |
| 284 | { |
| 285 | int id, err; |
| 286 | struct device *dev; |
| 287 | |
| 288 | if (!esoc_clink->name || !esoc_clink->link_name || |
| 289 | !esoc_clink->clink_ops) { |
| 290 | dev_err(esoc_clink->parent, "invalid esoc arguments\n"); |
| 291 | return -EINVAL; |
| 292 | } |
| 293 | id = ida_simple_get(&esoc_ida, 0, ESOC_DEV_MAX, GFP_KERNEL); |
| 294 | if (id < 0) { |
| 295 | err = id; |
| 296 | goto exit_ida; |
| 297 | } |
| 298 | esoc_clink->id = id; |
| 299 | dev = &esoc_clink->dev; |
| 300 | dev->bus = &esoc_bus_type; |
| 301 | dev->release = esoc_clink_release; |
| 302 | if (!esoc_clink->parent) |
| 303 | dev->parent = &esoc_bus; |
| 304 | else |
| 305 | dev->parent = esoc_clink->parent; |
| 306 | dev_set_name(dev, "esoc%d", id); |
| 307 | err = device_register(dev); |
| 308 | if (err) { |
| 309 | dev_err(esoc_clink->parent, "esoc device register failed\n"); |
| 310 | goto exit_ida; |
| 311 | } |
| 312 | spin_lock_init(&esoc_clink->notify_lock); |
| 313 | return 0; |
| 314 | exit_ida: |
| 315 | ida_simple_remove(&esoc_ida, id); |
| 316 | pr_err("unable to register %s, err = %d\n", esoc_clink->name, err); |
| 317 | return err; |
| 318 | } |
| 319 | EXPORT_SYMBOL(esoc_clink_register); |
| 320 | |
| 321 | int esoc_clink_register_req_eng(struct esoc_clink *esoc_clink, |
| 322 | struct esoc_eng *eng) |
| 323 | { |
| 324 | if (esoc_clink->req_eng) |
| 325 | return -EBUSY; |
| 326 | if (!eng->handle_clink_req) |
| 327 | return -EINVAL; |
| 328 | esoc_clink->req_eng = eng; |
| 329 | eng->esoc_clink = esoc_clink; |
| 330 | esoc_clink_evt_notify(ESOC_REQ_ENG_ON, esoc_clink); |
| 331 | return 0; |
| 332 | } |
| 333 | EXPORT_SYMBOL(esoc_clink_register_req_eng); |
| 334 | |
| 335 | int esoc_clink_register_cmd_eng(struct esoc_clink *esoc_clink, |
| 336 | struct esoc_eng *eng) |
| 337 | { |
| 338 | if (esoc_clink->cmd_eng) |
| 339 | return -EBUSY; |
| 340 | esoc_clink->cmd_eng = eng; |
| 341 | eng->esoc_clink = esoc_clink; |
| 342 | esoc_clink_evt_notify(ESOC_CMD_ENG_ON, esoc_clink); |
| 343 | return 0; |
| 344 | } |
| 345 | EXPORT_SYMBOL(esoc_clink_register_cmd_eng); |
| 346 | |
| 347 | void esoc_clink_unregister_req_eng(struct esoc_clink *esoc_clink, |
| 348 | struct esoc_eng *eng) |
| 349 | { |
| 350 | esoc_clink->req_eng = NULL; |
| 351 | esoc_clink_evt_notify(ESOC_REQ_ENG_OFF, esoc_clink); |
| 352 | } |
| 353 | EXPORT_SYMBOL(esoc_clink_unregister_req_eng); |
| 354 | |
| 355 | void esoc_clink_unregister_cmd_eng(struct esoc_clink *esoc_clink, |
| 356 | struct esoc_eng *eng) |
| 357 | { |
| 358 | esoc_clink->cmd_eng = NULL; |
| 359 | esoc_clink_evt_notify(ESOC_CMD_ENG_OFF, esoc_clink); |
| 360 | } |
| 361 | EXPORT_SYMBOL(esoc_clink_unregister_cmd_eng); |
| 362 | |
| 363 | int esoc_drv_register(struct esoc_drv *driver) |
| 364 | { |
| 365 | int ret; |
| 366 | |
| 367 | driver->driver.bus = &esoc_bus_type; |
| 368 | driver->driver.probe = esoc_bus_probe; |
| 369 | ret = driver_register(&driver->driver); |
| 370 | if (ret) |
| 371 | return ret; |
| 372 | return 0; |
| 373 | } |
| 374 | EXPORT_SYMBOL(esoc_drv_register); |
| 375 | |
| 376 | static int __init esoc_init(void) |
| 377 | { |
| 378 | int ret; |
| 379 | |
| 380 | ret = device_register(&esoc_bus); |
| 381 | if (ret) { |
| 382 | pr_err("esoc bus device register fail\n"); |
| 383 | return ret; |
| 384 | } |
| 385 | ret = bus_register(&esoc_bus_type); |
| 386 | if (ret) { |
| 387 | pr_err("esoc bus register fail\n"); |
| 388 | return ret; |
| 389 | } |
| 390 | pr_debug("esoc bus registration done\n"); |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | subsys_initcall(esoc_init); |
| 395 | MODULE_LICENSE("GPL v2"); |