rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Core driver for the pin muxing portions of the pin control subsystem |
| 3 | * |
| 4 | * Copyright (C) 2011-2012 ST-Ericsson SA |
| 5 | * Written on behalf of Linaro for ST-Ericsson |
| 6 | * Based on bits of regulator core, gpio core and clk core |
| 7 | * |
| 8 | * Author: Linus Walleij <linus.walleij@linaro.org> |
| 9 | * |
| 10 | * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. |
| 11 | * |
| 12 | * License terms: GNU General Public License (GPL) version 2 |
| 13 | */ |
| 14 | #define pr_fmt(fmt) "pinmux core: " fmt |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/device.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/radix-tree.h> |
| 22 | #include <linux/err.h> |
| 23 | #include <linux/list.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/sysfs.h> |
| 26 | #include <linux/debugfs.h> |
| 27 | #include <linux/seq_file.h> |
| 28 | #include <linux/pinctrl/machine.h> |
| 29 | #include <linux/pinctrl/pinmux.h> |
| 30 | #include "core.h" |
| 31 | #include "pinmux.h" |
| 32 | |
| 33 | int pinmux_check_ops(struct pinctrl_dev *pctldev) |
| 34 | { |
| 35 | const struct pinmux_ops *ops = pctldev->desc->pmxops; |
| 36 | unsigned nfuncs; |
| 37 | unsigned selector = 0; |
| 38 | |
| 39 | /* Check that we implement required operations */ |
| 40 | if (!ops || |
| 41 | !ops->get_functions_count || |
| 42 | !ops->get_function_name || |
| 43 | !ops->get_function_groups || |
| 44 | !ops->set_mux) { |
| 45 | dev_err(pctldev->dev, "pinmux ops lacks necessary functions\n"); |
| 46 | return -EINVAL; |
| 47 | } |
| 48 | /* Check that all functions registered have names */ |
| 49 | nfuncs = ops->get_functions_count(pctldev); |
| 50 | while (selector < nfuncs) { |
| 51 | const char *fname = ops->get_function_name(pctldev, |
| 52 | selector); |
| 53 | if (!fname) { |
| 54 | dev_err(pctldev->dev, "pinmux ops has no name for function%u\n", |
| 55 | selector); |
| 56 | return -EINVAL; |
| 57 | } |
| 58 | selector++; |
| 59 | } |
| 60 | |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | int pinmux_validate_map(const struct pinctrl_map *map, int i) |
| 65 | { |
| 66 | if (!map->data.mux.function) { |
| 67 | pr_err("failed to register map %s (%d): no function given\n", |
| 68 | map->name, i); |
| 69 | return -EINVAL; |
| 70 | } |
| 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * pin_request() - request a single pin to be muxed in, typically for GPIO |
| 77 | * @pin: the pin number in the global pin space |
| 78 | * @owner: a representation of the owner of this pin; typically the device |
| 79 | * name that controls its mux function, or the requested GPIO name |
| 80 | * @gpio_range: the range matching the GPIO pin if this is a request for a |
| 81 | * single GPIO pin |
| 82 | */ |
| 83 | static int pin_request(struct pinctrl_dev *pctldev, |
| 84 | int pin, const char *owner, |
| 85 | struct pinctrl_gpio_range *gpio_range) |
| 86 | { |
| 87 | struct pin_desc *desc; |
| 88 | const struct pinmux_ops *ops = pctldev->desc->pmxops; |
| 89 | int status = -EINVAL; |
| 90 | |
| 91 | desc = pin_desc_get(pctldev, pin); |
| 92 | if (desc == NULL) { |
| 93 | dev_err(pctldev->dev, |
| 94 | "pin %d is not registered so it cannot be requested\n", |
| 95 | pin); |
| 96 | goto out; |
| 97 | } |
| 98 | |
| 99 | dev_dbg(pctldev->dev, "request pin %d (%s) for %s\n", |
| 100 | pin, desc->name, owner); |
| 101 | |
| 102 | if ((!gpio_range || ops->strict) && |
| 103 | desc->mux_usecount && strcmp(desc->mux_owner, owner)) { |
| 104 | dev_err(pctldev->dev, |
| 105 | "pin %s already requested by %s; cannot claim for %s\n", |
| 106 | desc->name, desc->mux_owner, owner); |
| 107 | goto out; |
| 108 | } |
| 109 | |
| 110 | if ((gpio_range || ops->strict) && desc->gpio_owner) { |
| 111 | dev_err(pctldev->dev, |
| 112 | "pin %s already requested by %s; cannot claim for %s\n", |
| 113 | desc->name, desc->gpio_owner, owner); |
| 114 | goto out; |
| 115 | } |
| 116 | |
| 117 | if (gpio_range) { |
| 118 | desc->gpio_owner = owner; |
| 119 | } else { |
| 120 | desc->mux_usecount++; |
| 121 | if (desc->mux_usecount > 1) |
| 122 | return 0; |
| 123 | |
| 124 | desc->mux_owner = owner; |
| 125 | } |
| 126 | |
| 127 | /* Let each pin increase references to this module */ |
| 128 | if (!try_module_get(pctldev->owner)) { |
| 129 | dev_err(pctldev->dev, |
| 130 | "could not increase module refcount for pin %d\n", |
| 131 | pin); |
| 132 | status = -EINVAL; |
| 133 | goto out_free_pin; |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * If there is no kind of request function for the pin we just assume |
| 138 | * we got it by default and proceed. |
| 139 | */ |
| 140 | if (gpio_range && ops->gpio_request_enable) |
| 141 | /* This requests and enables a single GPIO pin */ |
| 142 | status = ops->gpio_request_enable(pctldev, gpio_range, pin); |
| 143 | else if (ops->request) |
| 144 | status = ops->request(pctldev, pin); |
| 145 | else |
| 146 | status = 0; |
| 147 | |
| 148 | if (status) { |
| 149 | dev_err(pctldev->dev, "request() failed for pin %d\n", pin); |
| 150 | module_put(pctldev->owner); |
| 151 | } |
| 152 | |
| 153 | out_free_pin: |
| 154 | if (status) { |
| 155 | if (gpio_range) { |
| 156 | desc->gpio_owner = NULL; |
| 157 | } else { |
| 158 | desc->mux_usecount--; |
| 159 | if (!desc->mux_usecount) |
| 160 | desc->mux_owner = NULL; |
| 161 | } |
| 162 | } |
| 163 | out: |
| 164 | if (status) |
| 165 | dev_err(pctldev->dev, "pin-%d (%s) status %d\n", |
| 166 | pin, owner, status); |
| 167 | |
| 168 | return status; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * pin_free() - release a single muxed in pin so something else can be muxed |
| 173 | * @pctldev: pin controller device handling this pin |
| 174 | * @pin: the pin to free |
| 175 | * @gpio_range: the range matching the GPIO pin if this is a request for a |
| 176 | * single GPIO pin |
| 177 | * |
| 178 | * This function returns a pointer to the previous owner. This is used |
| 179 | * for callers that dynamically allocate an owner name so it can be freed |
| 180 | * once the pin is free. This is done for GPIO request functions. |
| 181 | */ |
| 182 | static const char *pin_free(struct pinctrl_dev *pctldev, int pin, |
| 183 | struct pinctrl_gpio_range *gpio_range) |
| 184 | { |
| 185 | const struct pinmux_ops *ops = pctldev->desc->pmxops; |
| 186 | struct pin_desc *desc; |
| 187 | const char *owner; |
| 188 | |
| 189 | desc = pin_desc_get(pctldev, pin); |
| 190 | if (desc == NULL) { |
| 191 | dev_err(pctldev->dev, |
| 192 | "pin is not registered so it cannot be freed\n"); |
| 193 | return NULL; |
| 194 | } |
| 195 | |
| 196 | if (!gpio_range) { |
| 197 | /* |
| 198 | * A pin should not be freed more times than allocated. |
| 199 | */ |
| 200 | if (WARN_ON(!desc->mux_usecount)) |
| 201 | return NULL; |
| 202 | desc->mux_usecount--; |
| 203 | if (desc->mux_usecount) |
| 204 | return NULL; |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * If there is no kind of request function for the pin we just assume |
| 209 | * we got it by default and proceed. |
| 210 | */ |
| 211 | if (gpio_range && ops->gpio_disable_free) |
| 212 | ops->gpio_disable_free(pctldev, gpio_range, pin); |
| 213 | else if (ops->free) |
| 214 | ops->free(pctldev, pin); |
| 215 | |
| 216 | if (gpio_range) { |
| 217 | owner = desc->gpio_owner; |
| 218 | desc->gpio_owner = NULL; |
| 219 | } else { |
| 220 | owner = desc->mux_owner; |
| 221 | desc->mux_owner = NULL; |
| 222 | desc->mux_setting = NULL; |
| 223 | } |
| 224 | |
| 225 | module_put(pctldev->owner); |
| 226 | |
| 227 | return owner; |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * pinmux_request_gpio() - request pinmuxing for a GPIO pin |
| 232 | * @pctldev: pin controller device affected |
| 233 | * @pin: the pin to mux in for GPIO |
| 234 | * @range: the applicable GPIO range |
| 235 | */ |
| 236 | int pinmux_request_gpio(struct pinctrl_dev *pctldev, |
| 237 | struct pinctrl_gpio_range *range, |
| 238 | unsigned pin, unsigned gpio) |
| 239 | { |
| 240 | const char *owner; |
| 241 | int ret; |
| 242 | |
| 243 | /* Conjure some name stating what chip and pin this is taken by */ |
| 244 | owner = kasprintf(GFP_KERNEL, "%s:%d", range->name, gpio); |
| 245 | if (!owner) |
| 246 | return -ENOMEM; |
| 247 | |
| 248 | ret = pin_request(pctldev, pin, owner, range); |
| 249 | if (ret < 0) |
| 250 | kfree(owner); |
| 251 | |
| 252 | return ret; |
| 253 | } |
| 254 | |
| 255 | /** |
| 256 | * pinmux_free_gpio() - release a pin from GPIO muxing |
| 257 | * @pctldev: the pin controller device for the pin |
| 258 | * @pin: the affected currently GPIO-muxed in pin |
| 259 | * @range: applicable GPIO range |
| 260 | */ |
| 261 | void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin, |
| 262 | struct pinctrl_gpio_range *range) |
| 263 | { |
| 264 | const char *owner; |
| 265 | |
| 266 | owner = pin_free(pctldev, pin, range); |
| 267 | kfree(owner); |
| 268 | } |
| 269 | |
| 270 | /** |
| 271 | * pinmux_gpio_direction() - set the direction of a single muxed-in GPIO pin |
| 272 | * @pctldev: the pin controller handling this pin |
| 273 | * @range: applicable GPIO range |
| 274 | * @pin: the affected GPIO pin in this controller |
| 275 | * @input: true if we set the pin as input, false for output |
| 276 | */ |
| 277 | int pinmux_gpio_direction(struct pinctrl_dev *pctldev, |
| 278 | struct pinctrl_gpio_range *range, |
| 279 | unsigned pin, bool input) |
| 280 | { |
| 281 | const struct pinmux_ops *ops; |
| 282 | int ret; |
| 283 | |
| 284 | ops = pctldev->desc->pmxops; |
| 285 | |
| 286 | if (ops->gpio_set_direction) |
| 287 | ret = ops->gpio_set_direction(pctldev, range, pin, input); |
| 288 | else |
| 289 | ret = 0; |
| 290 | |
| 291 | return ret; |
| 292 | } |
| 293 | |
| 294 | static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev, |
| 295 | const char *function) |
| 296 | { |
| 297 | const struct pinmux_ops *ops = pctldev->desc->pmxops; |
| 298 | unsigned nfuncs = ops->get_functions_count(pctldev); |
| 299 | unsigned selector = 0; |
| 300 | |
| 301 | /* See if this pctldev has this function */ |
| 302 | while (selector < nfuncs) { |
| 303 | const char *fname = ops->get_function_name(pctldev, selector); |
| 304 | |
| 305 | if (!strcmp(function, fname)) |
| 306 | return selector; |
| 307 | |
| 308 | selector++; |
| 309 | } |
| 310 | |
| 311 | dev_err(pctldev->dev, "function '%s' not supported\n", function); |
| 312 | return -EINVAL; |
| 313 | } |
| 314 | |
| 315 | int pinmux_map_to_setting(const struct pinctrl_map *map, |
| 316 | struct pinctrl_setting *setting) |
| 317 | { |
| 318 | struct pinctrl_dev *pctldev = setting->pctldev; |
| 319 | const struct pinmux_ops *pmxops = pctldev->desc->pmxops; |
| 320 | char const * const *groups; |
| 321 | unsigned num_groups; |
| 322 | int ret; |
| 323 | const char *group; |
| 324 | |
| 325 | if (!pmxops) { |
| 326 | dev_err(pctldev->dev, "does not support mux function\n"); |
| 327 | return -EINVAL; |
| 328 | } |
| 329 | |
| 330 | ret = pinmux_func_name_to_selector(pctldev, map->data.mux.function); |
| 331 | if (ret < 0) { |
| 332 | dev_err(pctldev->dev, "invalid function %s in map table\n", |
| 333 | map->data.mux.function); |
| 334 | return ret; |
| 335 | } |
| 336 | setting->data.mux.func = ret; |
| 337 | |
| 338 | ret = pmxops->get_function_groups(pctldev, setting->data.mux.func, |
| 339 | &groups, &num_groups); |
| 340 | if (ret < 0) { |
| 341 | dev_err(pctldev->dev, "can't query groups for function %s\n", |
| 342 | map->data.mux.function); |
| 343 | return ret; |
| 344 | } |
| 345 | if (!num_groups) { |
| 346 | dev_err(pctldev->dev, |
| 347 | "function %s can't be selected on any group\n", |
| 348 | map->data.mux.function); |
| 349 | return -EINVAL; |
| 350 | } |
| 351 | if (map->data.mux.group) { |
| 352 | group = map->data.mux.group; |
| 353 | ret = match_string(groups, num_groups, group); |
| 354 | if (ret < 0) { |
| 355 | dev_err(pctldev->dev, |
| 356 | "invalid group \"%s\" for function \"%s\"\n", |
| 357 | group, map->data.mux.function); |
| 358 | return ret; |
| 359 | } |
| 360 | } else { |
| 361 | group = groups[0]; |
| 362 | } |
| 363 | |
| 364 | ret = pinctrl_get_group_selector(pctldev, group); |
| 365 | if (ret < 0) { |
| 366 | dev_err(pctldev->dev, "invalid group %s in map table\n", |
| 367 | map->data.mux.group); |
| 368 | return ret; |
| 369 | } |
| 370 | setting->data.mux.group = ret; |
| 371 | |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | void pinmux_free_setting(const struct pinctrl_setting *setting) |
| 376 | { |
| 377 | /* This function is currently unused */ |
| 378 | } |
| 379 | |
| 380 | int pinmux_enable_setting(const struct pinctrl_setting *setting) |
| 381 | { |
| 382 | struct pinctrl_dev *pctldev = setting->pctldev; |
| 383 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
| 384 | const struct pinmux_ops *ops = pctldev->desc->pmxops; |
| 385 | int ret = 0; |
| 386 | const unsigned *pins = NULL; |
| 387 | unsigned num_pins = 0; |
| 388 | int i; |
| 389 | struct pin_desc *desc; |
| 390 | |
| 391 | if (pctlops->get_group_pins) |
| 392 | ret = pctlops->get_group_pins(pctldev, setting->data.mux.group, |
| 393 | &pins, &num_pins); |
| 394 | |
| 395 | if (ret) { |
| 396 | const char *gname; |
| 397 | |
| 398 | /* errors only affect debug data, so just warn */ |
| 399 | gname = pctlops->get_group_name(pctldev, |
| 400 | setting->data.mux.group); |
| 401 | dev_warn(pctldev->dev, |
| 402 | "could not get pins for group %s\n", |
| 403 | gname); |
| 404 | num_pins = 0; |
| 405 | } |
| 406 | |
| 407 | /* Try to allocate all pins in this group, one by one */ |
| 408 | for (i = 0; i < num_pins; i++) { |
| 409 | ret = pin_request(pctldev, pins[i], setting->dev_name, NULL); |
| 410 | if (ret) { |
| 411 | const char *gname; |
| 412 | const char *pname; |
| 413 | |
| 414 | desc = pin_desc_get(pctldev, pins[i]); |
| 415 | pname = desc ? desc->name : "non-existing"; |
| 416 | gname = pctlops->get_group_name(pctldev, |
| 417 | setting->data.mux.group); |
| 418 | dev_err(pctldev->dev, |
| 419 | "could not request pin %d (%s) from group %s " |
| 420 | " on device %s\n", |
| 421 | pins[i], pname, gname, |
| 422 | pinctrl_dev_get_name(pctldev)); |
| 423 | goto err_pin_request; |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | /* Now that we have acquired the pins, encode the mux setting */ |
| 428 | for (i = 0; i < num_pins; i++) { |
| 429 | desc = pin_desc_get(pctldev, pins[i]); |
| 430 | if (desc == NULL) { |
| 431 | dev_warn(pctldev->dev, |
| 432 | "could not get pin desc for pin %d\n", |
| 433 | pins[i]); |
| 434 | continue; |
| 435 | } |
| 436 | desc->mux_setting = &(setting->data.mux); |
| 437 | } |
| 438 | |
| 439 | ret = ops->set_mux(pctldev, setting->data.mux.func, |
| 440 | setting->data.mux.group); |
| 441 | |
| 442 | if (ret) |
| 443 | goto err_set_mux; |
| 444 | |
| 445 | return 0; |
| 446 | |
| 447 | err_set_mux: |
| 448 | for (i = 0; i < num_pins; i++) { |
| 449 | desc = pin_desc_get(pctldev, pins[i]); |
| 450 | if (desc) |
| 451 | desc->mux_setting = NULL; |
| 452 | } |
| 453 | err_pin_request: |
| 454 | /* On error release all taken pins */ |
| 455 | while (--i >= 0) |
| 456 | pin_free(pctldev, pins[i], NULL); |
| 457 | |
| 458 | return ret; |
| 459 | } |
| 460 | |
| 461 | void pinmux_disable_setting(const struct pinctrl_setting *setting) |
| 462 | { |
| 463 | struct pinctrl_dev *pctldev = setting->pctldev; |
| 464 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
| 465 | int ret = 0; |
| 466 | const unsigned *pins = NULL; |
| 467 | unsigned num_pins = 0; |
| 468 | int i; |
| 469 | struct pin_desc *desc; |
| 470 | |
| 471 | if (pctlops->get_group_pins) |
| 472 | ret = pctlops->get_group_pins(pctldev, setting->data.mux.group, |
| 473 | &pins, &num_pins); |
| 474 | if (ret) { |
| 475 | const char *gname; |
| 476 | |
| 477 | /* errors only affect debug data, so just warn */ |
| 478 | gname = pctlops->get_group_name(pctldev, |
| 479 | setting->data.mux.group); |
| 480 | dev_warn(pctldev->dev, |
| 481 | "could not get pins for group %s\n", |
| 482 | gname); |
| 483 | num_pins = 0; |
| 484 | } |
| 485 | |
| 486 | /* Flag the descs that no setting is active */ |
| 487 | for (i = 0; i < num_pins; i++) { |
| 488 | desc = pin_desc_get(pctldev, pins[i]); |
| 489 | if (desc == NULL) { |
| 490 | dev_warn(pctldev->dev, |
| 491 | "could not get pin desc for pin %d\n", |
| 492 | pins[i]); |
| 493 | continue; |
| 494 | } |
| 495 | if (desc->mux_setting == &(setting->data.mux)) { |
| 496 | desc->mux_setting = NULL; |
| 497 | /* And release the pin */ |
| 498 | pin_free(pctldev, pins[i], NULL); |
| 499 | } else { |
| 500 | const char *gname; |
| 501 | |
| 502 | gname = pctlops->get_group_name(pctldev, |
| 503 | setting->data.mux.group); |
| 504 | dev_warn(pctldev->dev, |
| 505 | "not freeing pin %d (%s) as part of " |
| 506 | "deactivating group %s - it is already " |
| 507 | "used for some other setting", |
| 508 | pins[i], desc->name, gname); |
| 509 | } |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | #ifdef CONFIG_DEBUG_FS |
| 514 | |
| 515 | /* Called from pincontrol core */ |
| 516 | static int pinmux_functions_show(struct seq_file *s, void *what) |
| 517 | { |
| 518 | struct pinctrl_dev *pctldev = s->private; |
| 519 | const struct pinmux_ops *pmxops = pctldev->desc->pmxops; |
| 520 | unsigned nfuncs; |
| 521 | unsigned func_selector = 0; |
| 522 | |
| 523 | if (!pmxops) |
| 524 | return 0; |
| 525 | |
| 526 | mutex_lock(&pctldev->mutex); |
| 527 | nfuncs = pmxops->get_functions_count(pctldev); |
| 528 | while (func_selector < nfuncs) { |
| 529 | const char *func = pmxops->get_function_name(pctldev, |
| 530 | func_selector); |
| 531 | const char * const *groups; |
| 532 | unsigned num_groups; |
| 533 | int ret; |
| 534 | int i; |
| 535 | |
| 536 | ret = pmxops->get_function_groups(pctldev, func_selector, |
| 537 | &groups, &num_groups); |
| 538 | if (ret) { |
| 539 | seq_printf(s, "function %s: COULD NOT GET GROUPS\n", |
| 540 | func); |
| 541 | func_selector++; |
| 542 | continue; |
| 543 | } |
| 544 | |
| 545 | seq_printf(s, "function: %s, groups = [ ", func); |
| 546 | for (i = 0; i < num_groups; i++) |
| 547 | seq_printf(s, "%s ", groups[i]); |
| 548 | seq_puts(s, "]\n"); |
| 549 | |
| 550 | func_selector++; |
| 551 | } |
| 552 | |
| 553 | mutex_unlock(&pctldev->mutex); |
| 554 | |
| 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | static int pinmux_pins_show(struct seq_file *s, void *what) |
| 559 | { |
| 560 | struct pinctrl_dev *pctldev = s->private; |
| 561 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
| 562 | const struct pinmux_ops *pmxops = pctldev->desc->pmxops; |
| 563 | unsigned i, pin; |
| 564 | |
| 565 | if (!pmxops) |
| 566 | return 0; |
| 567 | |
| 568 | seq_puts(s, "Pinmux settings per pin\n"); |
| 569 | if (pmxops->strict) |
| 570 | seq_puts(s, |
| 571 | "Format: pin (name): mux_owner|gpio_owner (strict) hog?\n"); |
| 572 | else |
| 573 | seq_puts(s, |
| 574 | "Format: pin (name): mux_owner gpio_owner hog?\n"); |
| 575 | |
| 576 | mutex_lock(&pctldev->mutex); |
| 577 | |
| 578 | /* The pin number can be retrived from the pin controller descriptor */ |
| 579 | for (i = 0; i < pctldev->desc->npins; i++) { |
| 580 | struct pin_desc *desc; |
| 581 | bool is_hog = false; |
| 582 | |
| 583 | pin = pctldev->desc->pins[i].number; |
| 584 | desc = pin_desc_get(pctldev, pin); |
| 585 | /* Skip if we cannot search the pin */ |
| 586 | if (desc == NULL) |
| 587 | continue; |
| 588 | |
| 589 | if (desc->mux_owner && |
| 590 | !strcmp(desc->mux_owner, pinctrl_dev_get_name(pctldev))) |
| 591 | is_hog = true; |
| 592 | |
| 593 | if (pmxops->strict) { |
| 594 | if (desc->mux_owner) |
| 595 | seq_printf(s, "pin %d (%s): device %s%s", |
| 596 | pin, desc->name, desc->mux_owner, |
| 597 | is_hog ? " (HOG)" : ""); |
| 598 | else if (desc->gpio_owner) |
| 599 | seq_printf(s, "pin %d (%s): GPIO %s", |
| 600 | pin, desc->name, desc->gpio_owner); |
| 601 | else |
| 602 | seq_printf(s, "pin %d (%s): UNCLAIMED", |
| 603 | pin, desc->name); |
| 604 | } else { |
| 605 | /* For non-strict controllers */ |
| 606 | seq_printf(s, "pin %d (%s): %s %s%s", pin, desc->name, |
| 607 | desc->mux_owner ? desc->mux_owner |
| 608 | : "(MUX UNCLAIMED)", |
| 609 | desc->gpio_owner ? desc->gpio_owner |
| 610 | : "(GPIO UNCLAIMED)", |
| 611 | is_hog ? " (HOG)" : ""); |
| 612 | } |
| 613 | |
| 614 | /* If mux: print function+group claiming the pin */ |
| 615 | if (desc->mux_setting) |
| 616 | seq_printf(s, " function %s group %s\n", |
| 617 | pmxops->get_function_name(pctldev, |
| 618 | desc->mux_setting->func), |
| 619 | pctlops->get_group_name(pctldev, |
| 620 | desc->mux_setting->group)); |
| 621 | else |
| 622 | seq_printf(s, "\n"); |
| 623 | } |
| 624 | |
| 625 | mutex_unlock(&pctldev->mutex); |
| 626 | |
| 627 | return 0; |
| 628 | } |
| 629 | |
| 630 | void pinmux_show_map(struct seq_file *s, const struct pinctrl_map *map) |
| 631 | { |
| 632 | seq_printf(s, "group %s\nfunction %s\n", |
| 633 | map->data.mux.group ? map->data.mux.group : "(default)", |
| 634 | map->data.mux.function); |
| 635 | } |
| 636 | |
| 637 | void pinmux_show_setting(struct seq_file *s, |
| 638 | const struct pinctrl_setting *setting) |
| 639 | { |
| 640 | struct pinctrl_dev *pctldev = setting->pctldev; |
| 641 | const struct pinmux_ops *pmxops = pctldev->desc->pmxops; |
| 642 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
| 643 | |
| 644 | seq_printf(s, "group: %s (%u) function: %s (%u)\n", |
| 645 | pctlops->get_group_name(pctldev, setting->data.mux.group), |
| 646 | setting->data.mux.group, |
| 647 | pmxops->get_function_name(pctldev, setting->data.mux.func), |
| 648 | setting->data.mux.func); |
| 649 | } |
| 650 | |
| 651 | static int pinmux_functions_open(struct inode *inode, struct file *file) |
| 652 | { |
| 653 | return single_open(file, pinmux_functions_show, inode->i_private); |
| 654 | } |
| 655 | |
| 656 | static int pinmux_pins_open(struct inode *inode, struct file *file) |
| 657 | { |
| 658 | return single_open(file, pinmux_pins_show, inode->i_private); |
| 659 | } |
| 660 | |
| 661 | static const struct file_operations pinmux_functions_ops = { |
| 662 | .open = pinmux_functions_open, |
| 663 | .read = seq_read, |
| 664 | .llseek = seq_lseek, |
| 665 | .release = single_release, |
| 666 | }; |
| 667 | |
| 668 | static const struct file_operations pinmux_pins_ops = { |
| 669 | .open = pinmux_pins_open, |
| 670 | .read = seq_read, |
| 671 | .llseek = seq_lseek, |
| 672 | .release = single_release, |
| 673 | }; |
| 674 | |
| 675 | void pinmux_init_device_debugfs(struct dentry *devroot, |
| 676 | struct pinctrl_dev *pctldev) |
| 677 | { |
| 678 | debugfs_create_file("pinmux-functions", S_IFREG | S_IRUGO, |
| 679 | devroot, pctldev, &pinmux_functions_ops); |
| 680 | debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO, |
| 681 | devroot, pctldev, &pinmux_pins_ops); |
| 682 | } |
| 683 | |
| 684 | #endif /* CONFIG_DEBUG_FS */ |
| 685 | |
| 686 | #ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS |
| 687 | |
| 688 | /** |
| 689 | * pinmux_generic_get_function_count() - returns number of functions |
| 690 | * @pctldev: pin controller device |
| 691 | */ |
| 692 | int pinmux_generic_get_function_count(struct pinctrl_dev *pctldev) |
| 693 | { |
| 694 | return pctldev->num_functions; |
| 695 | } |
| 696 | EXPORT_SYMBOL_GPL(pinmux_generic_get_function_count); |
| 697 | |
| 698 | /** |
| 699 | * pinmux_generic_get_function_name() - returns the function name |
| 700 | * @pctldev: pin controller device |
| 701 | * @selector: function number |
| 702 | */ |
| 703 | const char * |
| 704 | pinmux_generic_get_function_name(struct pinctrl_dev *pctldev, |
| 705 | unsigned int selector) |
| 706 | { |
| 707 | struct function_desc *function; |
| 708 | |
| 709 | function = radix_tree_lookup(&pctldev->pin_function_tree, |
| 710 | selector); |
| 711 | if (!function) |
| 712 | return NULL; |
| 713 | |
| 714 | return function->name; |
| 715 | } |
| 716 | EXPORT_SYMBOL_GPL(pinmux_generic_get_function_name); |
| 717 | |
| 718 | /** |
| 719 | * pinmux_generic_get_function_groups() - gets the function groups |
| 720 | * @pctldev: pin controller device |
| 721 | * @selector: function number |
| 722 | * @groups: array of pin groups |
| 723 | * @num_groups: number of pin groups |
| 724 | */ |
| 725 | int pinmux_generic_get_function_groups(struct pinctrl_dev *pctldev, |
| 726 | unsigned int selector, |
| 727 | const char * const **groups, |
| 728 | unsigned * const num_groups) |
| 729 | { |
| 730 | struct function_desc *function; |
| 731 | |
| 732 | function = radix_tree_lookup(&pctldev->pin_function_tree, |
| 733 | selector); |
| 734 | if (!function) { |
| 735 | dev_err(pctldev->dev, "%s could not find function%i\n", |
| 736 | __func__, selector); |
| 737 | return -EINVAL; |
| 738 | } |
| 739 | *groups = function->group_names; |
| 740 | *num_groups = function->num_group_names; |
| 741 | |
| 742 | return 0; |
| 743 | } |
| 744 | EXPORT_SYMBOL_GPL(pinmux_generic_get_function_groups); |
| 745 | |
| 746 | /** |
| 747 | * pinmux_generic_get_function() - returns a function based on the number |
| 748 | * @pctldev: pin controller device |
| 749 | * @group_selector: function number |
| 750 | */ |
| 751 | struct function_desc *pinmux_generic_get_function(struct pinctrl_dev *pctldev, |
| 752 | unsigned int selector) |
| 753 | { |
| 754 | struct function_desc *function; |
| 755 | |
| 756 | function = radix_tree_lookup(&pctldev->pin_function_tree, |
| 757 | selector); |
| 758 | if (!function) |
| 759 | return NULL; |
| 760 | |
| 761 | return function; |
| 762 | } |
| 763 | EXPORT_SYMBOL_GPL(pinmux_generic_get_function); |
| 764 | |
| 765 | /** |
| 766 | * pinmux_generic_add_function() - adds a function group |
| 767 | * @pctldev: pin controller device |
| 768 | * @name: name of the function |
| 769 | * @groups: array of pin groups |
| 770 | * @num_groups: number of pin groups |
| 771 | * @data: pin controller driver specific data |
| 772 | */ |
| 773 | int pinmux_generic_add_function(struct pinctrl_dev *pctldev, |
| 774 | const char *name, |
| 775 | const char **groups, |
| 776 | const unsigned int num_groups, |
| 777 | void *data) |
| 778 | { |
| 779 | struct function_desc *function; |
| 780 | |
| 781 | function = devm_kzalloc(pctldev->dev, sizeof(*function), GFP_KERNEL); |
| 782 | if (!function) |
| 783 | return -ENOMEM; |
| 784 | |
| 785 | function->name = name; |
| 786 | function->group_names = groups; |
| 787 | function->num_group_names = num_groups; |
| 788 | function->data = data; |
| 789 | |
| 790 | radix_tree_insert(&pctldev->pin_function_tree, pctldev->num_functions, |
| 791 | function); |
| 792 | |
| 793 | pctldev->num_functions++; |
| 794 | |
| 795 | return 0; |
| 796 | } |
| 797 | EXPORT_SYMBOL_GPL(pinmux_generic_add_function); |
| 798 | |
| 799 | /** |
| 800 | * pinmux_generic_remove_function() - removes a numbered function |
| 801 | * @pctldev: pin controller device |
| 802 | * @selector: function number |
| 803 | * |
| 804 | * Note that the caller must take care of locking. |
| 805 | */ |
| 806 | int pinmux_generic_remove_function(struct pinctrl_dev *pctldev, |
| 807 | unsigned int selector) |
| 808 | { |
| 809 | struct function_desc *function; |
| 810 | |
| 811 | function = radix_tree_lookup(&pctldev->pin_function_tree, |
| 812 | selector); |
| 813 | if (!function) |
| 814 | return -ENOENT; |
| 815 | |
| 816 | radix_tree_delete(&pctldev->pin_function_tree, selector); |
| 817 | devm_kfree(pctldev->dev, function); |
| 818 | |
| 819 | pctldev->num_functions--; |
| 820 | |
| 821 | return 0; |
| 822 | } |
| 823 | EXPORT_SYMBOL_GPL(pinmux_generic_remove_function); |
| 824 | |
| 825 | /** |
| 826 | * pinmux_generic_free_functions() - removes all functions |
| 827 | * @pctldev: pin controller device |
| 828 | * |
| 829 | * Note that the caller must take care of locking. The pinctrl |
| 830 | * functions are allocated with devm_kzalloc() so no need to free |
| 831 | * them here. |
| 832 | */ |
| 833 | void pinmux_generic_free_functions(struct pinctrl_dev *pctldev) |
| 834 | { |
| 835 | struct radix_tree_iter iter; |
| 836 | void __rcu **slot; |
| 837 | |
| 838 | radix_tree_for_each_slot(slot, &pctldev->pin_function_tree, &iter, 0) |
| 839 | radix_tree_delete(&pctldev->pin_function_tree, iter.index); |
| 840 | |
| 841 | pctldev->num_functions = 0; |
| 842 | } |
| 843 | |
| 844 | #endif /* CONFIG_GENERIC_PINMUX_FUNCTIONS */ |