Badhri Jagan Sridharan | 7dfee9c | 2015-08-31 21:36:07 -0700 | [diff] [blame] | 1 | /* |
| 2 | * class-dual-role.c |
| 3 | * |
| 4 | * Copyright (C) 2015 Google, Inc. |
| 5 | * |
| 6 | * This software is licensed under the terms of the GNU General Public |
| 7 | * License version 2, as published by the Free Software Foundation, and |
| 8 | * may be copied, distributed, and modified under those terms. |
| 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 | */ |
| 16 | |
| 17 | #include <linux/ctype.h> |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/usb/class-dual-role.h> |
| 20 | #include <linux/err.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/stat.h> |
| 25 | #include <linux/types.h> |
| 26 | |
| 27 | #define DUAL_ROLE_NOTIFICATION_TIMEOUT 2000 |
| 28 | |
| 29 | static ssize_t dual_role_store_property(struct device *dev, |
| 30 | struct device_attribute *attr, |
| 31 | const char *buf, size_t count); |
| 32 | static ssize_t dual_role_show_property(struct device *dev, |
| 33 | struct device_attribute *attr, |
| 34 | char *buf); |
| 35 | |
| 36 | #define DUAL_ROLE_ATTR(_name) \ |
| 37 | { \ |
| 38 | .attr = { .name = #_name }, \ |
| 39 | .show = dual_role_show_property, \ |
| 40 | .store = dual_role_store_property, \ |
| 41 | } |
| 42 | |
| 43 | static struct device_attribute dual_role_attrs[] = { |
| 44 | DUAL_ROLE_ATTR(supported_modes), |
| 45 | DUAL_ROLE_ATTR(mode), |
| 46 | DUAL_ROLE_ATTR(power_role), |
| 47 | DUAL_ROLE_ATTR(data_role), |
| 48 | DUAL_ROLE_ATTR(powers_vconn), |
| 49 | }; |
| 50 | |
| 51 | struct class *dual_role_class; |
| 52 | EXPORT_SYMBOL_GPL(dual_role_class); |
| 53 | |
| 54 | static struct device_type dual_role_dev_type; |
| 55 | |
| 56 | static char *kstrdupcase(const char *str, gfp_t gfp, bool to_upper) |
| 57 | { |
| 58 | char *ret, *ustr; |
| 59 | |
| 60 | ustr = ret = kmalloc(strlen(str) + 1, gfp); |
| 61 | |
| 62 | if (!ret) |
| 63 | return NULL; |
| 64 | |
| 65 | while (*str) |
| 66 | *ustr++ = to_upper ? toupper(*str++) : tolower(*str++); |
| 67 | |
| 68 | *ustr = 0; |
| 69 | |
| 70 | return ret; |
| 71 | } |
| 72 | |
| 73 | static void dual_role_changed_work(struct work_struct *work) |
| 74 | { |
| 75 | struct dual_role_phy_instance *dual_role = |
| 76 | container_of(work, struct dual_role_phy_instance, |
| 77 | changed_work); |
| 78 | |
| 79 | dev_dbg(&dual_role->dev, "%s\n", __func__); |
| 80 | kobject_uevent(&dual_role->dev.kobj, KOBJ_CHANGE); |
| 81 | } |
| 82 | |
| 83 | void dual_role_instance_changed(struct dual_role_phy_instance *dual_role) |
| 84 | { |
| 85 | dev_dbg(&dual_role->dev, "%s\n", __func__); |
| 86 | pm_wakeup_event(&dual_role->dev, DUAL_ROLE_NOTIFICATION_TIMEOUT); |
| 87 | schedule_work(&dual_role->changed_work); |
| 88 | } |
Amit Pundir | 9a9b168 | 2015-09-02 16:38:31 +0530 | [diff] [blame] | 89 | EXPORT_SYMBOL_GPL(dual_role_instance_changed); |
Badhri Jagan Sridharan | 7dfee9c | 2015-08-31 21:36:07 -0700 | [diff] [blame] | 90 | |
| 91 | int dual_role_get_property(struct dual_role_phy_instance *dual_role, |
| 92 | enum dual_role_property prop, |
| 93 | unsigned int *val) |
| 94 | { |
| 95 | return dual_role->desc->get_property(dual_role, prop, val); |
| 96 | } |
| 97 | EXPORT_SYMBOL_GPL(dual_role_get_property); |
| 98 | |
| 99 | int dual_role_set_property(struct dual_role_phy_instance *dual_role, |
| 100 | enum dual_role_property prop, |
| 101 | const unsigned int *val) |
| 102 | { |
| 103 | if (!dual_role->desc->set_property) |
| 104 | return -ENODEV; |
| 105 | |
| 106 | return dual_role->desc->set_property(dual_role, prop, val); |
| 107 | } |
| 108 | EXPORT_SYMBOL_GPL(dual_role_set_property); |
| 109 | |
| 110 | int dual_role_property_is_writeable(struct dual_role_phy_instance *dual_role, |
| 111 | enum dual_role_property prop) |
| 112 | { |
| 113 | if (!dual_role->desc->property_is_writeable) |
| 114 | return -ENODEV; |
| 115 | |
| 116 | return dual_role->desc->property_is_writeable(dual_role, prop); |
| 117 | } |
| 118 | EXPORT_SYMBOL_GPL(dual_role_property_is_writeable); |
| 119 | |
| 120 | static void dual_role_dev_release(struct device *dev) |
| 121 | { |
| 122 | struct dual_role_phy_instance *dual_role = |
| 123 | container_of(dev, struct dual_role_phy_instance, dev); |
| 124 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
| 125 | kfree(dual_role); |
| 126 | } |
| 127 | |
| 128 | static struct dual_role_phy_instance *__must_check |
| 129 | __dual_role_register(struct device *parent, |
| 130 | const struct dual_role_phy_desc *desc) |
| 131 | { |
| 132 | struct device *dev; |
| 133 | struct dual_role_phy_instance *dual_role; |
| 134 | int rc; |
| 135 | |
| 136 | dual_role = kzalloc(sizeof(*dual_role), GFP_KERNEL); |
| 137 | if (!dual_role) |
| 138 | return ERR_PTR(-ENOMEM); |
| 139 | |
| 140 | dev = &dual_role->dev; |
| 141 | |
| 142 | device_initialize(dev); |
| 143 | |
| 144 | dev->class = dual_role_class; |
| 145 | dev->type = &dual_role_dev_type; |
| 146 | dev->parent = parent; |
| 147 | dev->release = dual_role_dev_release; |
| 148 | dev_set_drvdata(dev, dual_role); |
| 149 | dual_role->desc = desc; |
| 150 | |
| 151 | rc = dev_set_name(dev, "%s", desc->name); |
| 152 | if (rc) |
| 153 | goto dev_set_name_failed; |
| 154 | |
| 155 | INIT_WORK(&dual_role->changed_work, dual_role_changed_work); |
| 156 | |
| 157 | rc = device_init_wakeup(dev, true); |
| 158 | if (rc) |
| 159 | goto wakeup_init_failed; |
| 160 | |
| 161 | rc = device_add(dev); |
| 162 | if (rc) |
| 163 | goto device_add_failed; |
| 164 | |
| 165 | dual_role_instance_changed(dual_role); |
| 166 | |
| 167 | return dual_role; |
| 168 | |
| 169 | device_add_failed: |
| 170 | device_init_wakeup(dev, false); |
| 171 | wakeup_init_failed: |
| 172 | dev_set_name_failed: |
| 173 | put_device(dev); |
| 174 | kfree(dual_role); |
| 175 | |
| 176 | return ERR_PTR(rc); |
| 177 | } |
| 178 | |
| 179 | static void dual_role_instance_unregister(struct dual_role_phy_instance |
| 180 | *dual_role) |
| 181 | { |
| 182 | cancel_work_sync(&dual_role->changed_work); |
| 183 | device_init_wakeup(&dual_role->dev, false); |
| 184 | device_unregister(&dual_role->dev); |
| 185 | } |
| 186 | |
| 187 | static void devm_dual_role_release(struct device *dev, void *res) |
| 188 | { |
| 189 | struct dual_role_phy_instance **dual_role = res; |
| 190 | |
| 191 | dual_role_instance_unregister(*dual_role); |
| 192 | } |
| 193 | |
| 194 | struct dual_role_phy_instance *__must_check |
| 195 | devm_dual_role_instance_register(struct device *parent, |
| 196 | const struct dual_role_phy_desc *desc) |
| 197 | { |
| 198 | struct dual_role_phy_instance **ptr, *dual_role; |
| 199 | |
| 200 | ptr = devres_alloc(devm_dual_role_release, sizeof(*ptr), GFP_KERNEL); |
| 201 | |
| 202 | if (!ptr) |
| 203 | return ERR_PTR(-ENOMEM); |
| 204 | dual_role = __dual_role_register(parent, desc); |
| 205 | if (IS_ERR(dual_role)) { |
| 206 | devres_free(ptr); |
| 207 | } else { |
| 208 | *ptr = dual_role; |
| 209 | devres_add(parent, ptr); |
| 210 | } |
| 211 | return dual_role; |
| 212 | } |
| 213 | EXPORT_SYMBOL_GPL(devm_dual_role_instance_register); |
| 214 | |
| 215 | static int devm_dual_role_match(struct device *dev, void *res, void *data) |
| 216 | { |
| 217 | struct dual_role_phy_instance **r = res; |
| 218 | |
| 219 | if (WARN_ON(!r || !*r)) |
| 220 | return 0; |
| 221 | |
| 222 | return *r == data; |
| 223 | } |
| 224 | |
| 225 | void devm_dual_role_instance_unregister(struct device *dev, |
| 226 | struct dual_role_phy_instance |
| 227 | *dual_role) |
| 228 | { |
| 229 | int rc; |
| 230 | |
| 231 | rc = devres_release(dev, devm_dual_role_release, |
| 232 | devm_dual_role_match, dual_role); |
| 233 | WARN_ON(rc); |
| 234 | } |
| 235 | EXPORT_SYMBOL_GPL(devm_dual_role_instance_unregister); |
| 236 | |
| 237 | void *dual_role_get_drvdata(struct dual_role_phy_instance *dual_role) |
| 238 | { |
| 239 | return dual_role->drv_data; |
| 240 | } |
| 241 | EXPORT_SYMBOL_GPL(dual_role_get_drvdata); |
| 242 | |
| 243 | /***************** Device attribute functions **************************/ |
| 244 | |
| 245 | /* port type */ |
| 246 | static char *supported_modes_text[] = { |
| 247 | "ufp dfp", "dfp", "ufp" |
| 248 | }; |
| 249 | |
| 250 | /* current mode */ |
| 251 | static char *mode_text[] = { |
| 252 | "ufp", "dfp", "none" |
| 253 | }; |
| 254 | |
| 255 | /* Power role */ |
| 256 | static char *pr_text[] = { |
| 257 | "source", "sink", "none" |
| 258 | }; |
| 259 | |
| 260 | /* Data role */ |
| 261 | static char *dr_text[] = { |
| 262 | "host", "device", "none" |
| 263 | }; |
| 264 | |
| 265 | /* Vconn supply */ |
| 266 | static char *vconn_supply_text[] = { |
| 267 | "n", "y" |
| 268 | }; |
| 269 | |
| 270 | static ssize_t dual_role_show_property(struct device *dev, |
| 271 | struct device_attribute *attr, char *buf) |
| 272 | { |
| 273 | ssize_t ret = 0; |
| 274 | struct dual_role_phy_instance *dual_role = dev_get_drvdata(dev); |
| 275 | const ptrdiff_t off = attr - dual_role_attrs; |
| 276 | unsigned int value; |
| 277 | |
| 278 | if (off == DUAL_ROLE_PROP_SUPPORTED_MODES) { |
| 279 | value = dual_role->desc->supported_modes; |
| 280 | } else { |
| 281 | ret = dual_role_get_property(dual_role, off, &value); |
| 282 | |
| 283 | if (ret < 0) { |
| 284 | if (ret == -ENODATA) |
| 285 | dev_dbg(dev, |
| 286 | "driver has no data for `%s' property\n", |
| 287 | attr->attr.name); |
| 288 | else if (ret != -ENODEV) |
| 289 | dev_err(dev, |
| 290 | "driver failed to report `%s' property: %zd\n", |
| 291 | attr->attr.name, ret); |
| 292 | return ret; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | if (off == DUAL_ROLE_PROP_SUPPORTED_MODES) { |
| 297 | BUILD_BUG_ON(DUAL_ROLE_PROP_SUPPORTED_MODES_TOTAL != |
| 298 | ARRAY_SIZE(supported_modes_text)); |
| 299 | if (value < DUAL_ROLE_PROP_SUPPORTED_MODES_TOTAL) |
| 300 | return snprintf(buf, PAGE_SIZE, "%s\n", |
| 301 | supported_modes_text[value]); |
| 302 | else |
| 303 | return -EIO; |
| 304 | } else if (off == DUAL_ROLE_PROP_MODE) { |
| 305 | BUILD_BUG_ON(DUAL_ROLE_PROP_MODE_TOTAL != |
| 306 | ARRAY_SIZE(mode_text)); |
| 307 | if (value < DUAL_ROLE_PROP_MODE_TOTAL) |
| 308 | return snprintf(buf, PAGE_SIZE, "%s\n", |
| 309 | mode_text[value]); |
| 310 | else |
| 311 | return -EIO; |
| 312 | } else if (off == DUAL_ROLE_PROP_PR) { |
| 313 | BUILD_BUG_ON(DUAL_ROLE_PROP_PR_TOTAL != ARRAY_SIZE(pr_text)); |
| 314 | if (value < DUAL_ROLE_PROP_PR_TOTAL) |
| 315 | return snprintf(buf, PAGE_SIZE, "%s\n", |
| 316 | pr_text[value]); |
| 317 | else |
| 318 | return -EIO; |
| 319 | } else if (off == DUAL_ROLE_PROP_DR) { |
| 320 | BUILD_BUG_ON(DUAL_ROLE_PROP_DR_TOTAL != ARRAY_SIZE(dr_text)); |
| 321 | if (value < DUAL_ROLE_PROP_DR_TOTAL) |
| 322 | return snprintf(buf, PAGE_SIZE, "%s\n", |
| 323 | dr_text[value]); |
| 324 | else |
| 325 | return -EIO; |
| 326 | } else if (off == DUAL_ROLE_PROP_VCONN_SUPPLY) { |
| 327 | BUILD_BUG_ON(DUAL_ROLE_PROP_VCONN_SUPPLY_TOTAL != |
| 328 | ARRAY_SIZE(vconn_supply_text)); |
| 329 | if (value < DUAL_ROLE_PROP_VCONN_SUPPLY_TOTAL) |
| 330 | return snprintf(buf, PAGE_SIZE, "%s\n", |
| 331 | vconn_supply_text[value]); |
| 332 | else |
| 333 | return -EIO; |
| 334 | } else |
| 335 | return -EIO; |
| 336 | } |
| 337 | |
| 338 | static ssize_t dual_role_store_property(struct device *dev, |
| 339 | struct device_attribute *attr, |
| 340 | const char *buf, size_t count) |
| 341 | { |
| 342 | ssize_t ret; |
| 343 | struct dual_role_phy_instance *dual_role = dev_get_drvdata(dev); |
| 344 | const ptrdiff_t off = attr - dual_role_attrs; |
| 345 | unsigned int value; |
| 346 | int total, i; |
| 347 | char *dup_buf, **text_array; |
| 348 | bool result = false; |
| 349 | |
| 350 | dup_buf = kstrdupcase(buf, GFP_KERNEL, false); |
| 351 | switch (off) { |
| 352 | case DUAL_ROLE_PROP_MODE: |
| 353 | total = DUAL_ROLE_PROP_MODE_TOTAL; |
| 354 | text_array = mode_text; |
| 355 | break; |
| 356 | case DUAL_ROLE_PROP_PR: |
| 357 | total = DUAL_ROLE_PROP_PR_TOTAL; |
| 358 | text_array = pr_text; |
| 359 | break; |
| 360 | case DUAL_ROLE_PROP_DR: |
| 361 | total = DUAL_ROLE_PROP_DR_TOTAL; |
| 362 | text_array = dr_text; |
| 363 | break; |
| 364 | case DUAL_ROLE_PROP_VCONN_SUPPLY: |
| 365 | ret = strtobool(dup_buf, &result); |
| 366 | value = result; |
| 367 | if (!ret) |
| 368 | goto setprop; |
| 369 | default: |
| 370 | ret = -EINVAL; |
| 371 | goto error; |
| 372 | } |
| 373 | |
| 374 | for (i = 0; i <= total; i++) { |
| 375 | if (i == total) { |
| 376 | ret = -ENOTSUPP; |
| 377 | goto error; |
| 378 | } |
| 379 | if (!strncmp(*(text_array + i), dup_buf, |
| 380 | strlen(*(text_array + i)))) { |
| 381 | value = i; |
| 382 | break; |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | setprop: |
| 387 | ret = dual_role->desc->set_property(dual_role, off, &value); |
| 388 | |
| 389 | error: |
| 390 | kfree(dup_buf); |
| 391 | |
| 392 | if (ret < 0) |
| 393 | return ret; |
| 394 | |
| 395 | return count; |
| 396 | } |
| 397 | |
| 398 | static umode_t dual_role_attr_is_visible(struct kobject *kobj, |
| 399 | struct attribute *attr, int attrno) |
| 400 | { |
| 401 | struct device *dev = container_of(kobj, struct device, kobj); |
| 402 | struct dual_role_phy_instance *dual_role = dev_get_drvdata(dev); |
| 403 | umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; |
| 404 | int i; |
| 405 | |
| 406 | if (attrno == DUAL_ROLE_PROP_SUPPORTED_MODES) |
| 407 | return mode; |
| 408 | |
| 409 | for (i = 0; i < dual_role->desc->num_properties; i++) { |
| 410 | int property = dual_role->desc->properties[i]; |
| 411 | |
| 412 | if (property == attrno) { |
| 413 | if (dual_role->desc->property_is_writeable && |
| 414 | dual_role_property_is_writeable(dual_role, property) |
| 415 | > 0) |
| 416 | mode |= S_IWUSR; |
| 417 | |
| 418 | return mode; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | static struct attribute *__dual_role_attrs[ARRAY_SIZE(dual_role_attrs) + 1]; |
| 426 | |
| 427 | static struct attribute_group dual_role_attr_group = { |
| 428 | .attrs = __dual_role_attrs, |
| 429 | .is_visible = dual_role_attr_is_visible, |
| 430 | }; |
| 431 | |
| 432 | static const struct attribute_group *dual_role_attr_groups[] = { |
| 433 | &dual_role_attr_group, |
| 434 | NULL, |
| 435 | }; |
| 436 | |
| 437 | void dual_role_init_attrs(struct device_type *dev_type) |
| 438 | { |
| 439 | int i; |
| 440 | |
| 441 | dev_type->groups = dual_role_attr_groups; |
| 442 | |
| 443 | for (i = 0; i < ARRAY_SIZE(dual_role_attrs); i++) |
| 444 | __dual_role_attrs[i] = &dual_role_attrs[i].attr; |
| 445 | } |
| 446 | |
| 447 | int dual_role_uevent(struct device *dev, struct kobj_uevent_env *env) |
| 448 | { |
| 449 | struct dual_role_phy_instance *dual_role = dev_get_drvdata(dev); |
| 450 | int ret = 0, j; |
| 451 | char *prop_buf; |
| 452 | char *attrname; |
| 453 | |
| 454 | dev_dbg(dev, "uevent\n"); |
| 455 | |
| 456 | if (!dual_role || !dual_role->desc) { |
| 457 | dev_dbg(dev, "No dual_role phy yet\n"); |
| 458 | return ret; |
| 459 | } |
| 460 | |
| 461 | dev_dbg(dev, "DUAL_ROLE_NAME=%s\n", dual_role->desc->name); |
| 462 | |
| 463 | ret = add_uevent_var(env, "DUAL_ROLE_NAME=%s", dual_role->desc->name); |
| 464 | if (ret) |
| 465 | return ret; |
| 466 | |
| 467 | prop_buf = (char *)get_zeroed_page(GFP_KERNEL); |
| 468 | if (!prop_buf) |
| 469 | return -ENOMEM; |
| 470 | |
| 471 | for (j = 0; j < dual_role->desc->num_properties; j++) { |
| 472 | struct device_attribute *attr; |
| 473 | char *line; |
| 474 | |
| 475 | attr = &dual_role_attrs[dual_role->desc->properties[j]]; |
| 476 | |
| 477 | ret = dual_role_show_property(dev, attr, prop_buf); |
| 478 | if (ret == -ENODEV || ret == -ENODATA) { |
| 479 | ret = 0; |
| 480 | continue; |
| 481 | } |
| 482 | |
| 483 | if (ret < 0) |
| 484 | goto out; |
| 485 | line = strnchr(prop_buf, PAGE_SIZE, '\n'); |
| 486 | if (line) |
| 487 | *line = 0; |
| 488 | |
| 489 | attrname = kstrdupcase(attr->attr.name, GFP_KERNEL, true); |
| 490 | if (!attrname) |
| 491 | ret = -ENOMEM; |
| 492 | |
| 493 | dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); |
| 494 | |
| 495 | ret = add_uevent_var(env, "DUAL_ROLE_%s=%s", attrname, |
| 496 | prop_buf); |
| 497 | kfree(attrname); |
| 498 | if (ret) |
| 499 | goto out; |
| 500 | } |
| 501 | |
| 502 | out: |
| 503 | free_page((unsigned long)prop_buf); |
| 504 | |
| 505 | return ret; |
| 506 | } |
| 507 | |
| 508 | /******************* Module Init ***********************************/ |
| 509 | |
| 510 | static int __init dual_role_class_init(void) |
| 511 | { |
| 512 | dual_role_class = class_create(THIS_MODULE, "dual_role_usb"); |
| 513 | |
| 514 | if (IS_ERR(dual_role_class)) |
| 515 | return PTR_ERR(dual_role_class); |
| 516 | |
| 517 | dual_role_class->dev_uevent = dual_role_uevent; |
| 518 | dual_role_init_attrs(&dual_role_dev_type); |
| 519 | |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | static void __exit dual_role_class_exit(void) |
| 524 | { |
| 525 | class_destroy(dual_role_class); |
| 526 | } |
| 527 | |
| 528 | subsys_initcall(dual_role_class_init); |
| 529 | module_exit(dual_role_class_exit); |