1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * fan_core.c - ACPI Fan core Driver 4 * 5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 * Copyright (C) 2022 Intel Corporation. All rights reserved. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/types.h> 14 #include <linux/uaccess.h> 15 #include <linux/thermal.h> 16 #include <linux/acpi.h> 17 #include <linux/platform_device.h> 18 #include <linux/sort.h> 19 20 #include "fan.h" 21 22 static const struct acpi_device_id fan_device_ids[] = { 23 ACPI_FAN_DEVICE_IDS, 24 {"", 0}, 25 }; 26 MODULE_DEVICE_TABLE(acpi, fan_device_ids); 27 28 /* thermal cooling device callbacks */ 29 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long 30 *state) 31 { 32 struct acpi_device *device = cdev->devdata; 33 struct acpi_fan *fan = acpi_driver_data(device); 34 35 if (fan->acpi4) { 36 if (fan->fif.fine_grain_ctrl) 37 *state = 100 / fan->fif.step_size; 38 else 39 *state = fan->fps_count - 1; 40 } else { 41 *state = 1; 42 } 43 44 return 0; 45 } 46 47 int acpi_fan_get_fst(struct acpi_device *device, struct acpi_fan_fst *fst) 48 { 49 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 50 union acpi_object *obj; 51 acpi_status status; 52 int ret = 0; 53 54 status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer); 55 if (ACPI_FAILURE(status)) { 56 dev_err(&device->dev, "Get fan state failed\n"); 57 return -ENODEV; 58 } 59 60 obj = buffer.pointer; 61 if (!obj || obj->type != ACPI_TYPE_PACKAGE || 62 obj->package.count != 3 || 63 obj->package.elements[1].type != ACPI_TYPE_INTEGER) { 64 dev_err(&device->dev, "Invalid _FST data\n"); 65 ret = -EINVAL; 66 goto err; 67 } 68 69 fst->revision = obj->package.elements[0].integer.value; 70 fst->control = obj->package.elements[1].integer.value; 71 fst->speed = obj->package.elements[2].integer.value; 72 73 err: 74 kfree(obj); 75 return ret; 76 } 77 78 static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state) 79 { 80 struct acpi_fan *fan = acpi_driver_data(device); 81 struct acpi_fan_fst fst; 82 int status, i; 83 84 status = acpi_fan_get_fst(device, &fst); 85 if (status) 86 return status; 87 88 if (fan->fif.fine_grain_ctrl) { 89 /* This control should be same what we set using _FSL by spec */ 90 if (fst.control > 100) { 91 dev_dbg(&device->dev, "Invalid control value returned\n"); 92 goto match_fps; 93 } 94 95 *state = (int) fst.control / fan->fif.step_size; 96 return 0; 97 } 98 99 match_fps: 100 for (i = 0; i < fan->fps_count; i++) { 101 if (fst.control == fan->fps[i].control) 102 break; 103 } 104 if (i == fan->fps_count) { 105 dev_dbg(&device->dev, "Invalid control value returned\n"); 106 return -EINVAL; 107 } 108 109 *state = i; 110 111 return status; 112 } 113 114 static int fan_get_state(struct acpi_device *device, unsigned long *state) 115 { 116 int result; 117 int acpi_state = ACPI_STATE_D0; 118 119 result = acpi_device_update_power(device, &acpi_state); 120 if (result) 121 return result; 122 123 *state = acpi_state == ACPI_STATE_D3_COLD 124 || acpi_state == ACPI_STATE_D3_HOT ? 125 0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1); 126 return 0; 127 } 128 129 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long 130 *state) 131 { 132 struct acpi_device *device = cdev->devdata; 133 struct acpi_fan *fan = acpi_driver_data(device); 134 135 if (fan->acpi4) 136 return fan_get_state_acpi4(device, state); 137 else 138 return fan_get_state(device, state); 139 } 140 141 static int fan_set_state(struct acpi_device *device, unsigned long state) 142 { 143 if (state != 0 && state != 1) 144 return -EINVAL; 145 146 return acpi_device_set_power(device, 147 state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD); 148 } 149 150 static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state) 151 { 152 struct acpi_fan *fan = acpi_driver_data(device); 153 acpi_status status; 154 u64 value = state; 155 int max_state; 156 157 if (fan->fif.fine_grain_ctrl) 158 max_state = 100 / fan->fif.step_size; 159 else 160 max_state = fan->fps_count - 1; 161 162 if (state > max_state) 163 return -EINVAL; 164 165 if (fan->fif.fine_grain_ctrl) { 166 value *= fan->fif.step_size; 167 /* Spec allows compensate the last step only */ 168 if (value + fan->fif.step_size > 100) 169 value = 100; 170 } else { 171 value = fan->fps[state].control; 172 } 173 174 status = acpi_execute_simple_method(device->handle, "_FSL", value); 175 if (ACPI_FAILURE(status)) { 176 dev_dbg(&device->dev, "Failed to set state by _FSL\n"); 177 return -ENODEV; 178 } 179 180 return 0; 181 } 182 183 static int 184 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) 185 { 186 struct acpi_device *device = cdev->devdata; 187 struct acpi_fan *fan = acpi_driver_data(device); 188 189 if (fan->acpi4) 190 return fan_set_state_acpi4(device, state); 191 else 192 return fan_set_state(device, state); 193 } 194 195 static const struct thermal_cooling_device_ops fan_cooling_ops = { 196 .get_max_state = fan_get_max_state, 197 .get_cur_state = fan_get_cur_state, 198 .set_cur_state = fan_set_cur_state, 199 }; 200 201 /* -------------------------------------------------------------------------- 202 * Driver Interface 203 * -------------------------------------------------------------------------- 204 */ 205 206 static bool acpi_fan_is_acpi4(struct acpi_device *device) 207 { 208 return acpi_has_method(device->handle, "_FIF") && 209 acpi_has_method(device->handle, "_FPS") && 210 acpi_has_method(device->handle, "_FSL") && 211 acpi_has_method(device->handle, "_FST"); 212 } 213 214 static int acpi_fan_get_fif(struct acpi_device *device) 215 { 216 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 217 struct acpi_fan *fan = acpi_driver_data(device); 218 struct acpi_buffer format = { sizeof("NNNN"), "NNNN" }; 219 u64 fields[4]; 220 struct acpi_buffer fif = { sizeof(fields), fields }; 221 union acpi_object *obj; 222 acpi_status status; 223 224 status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer); 225 if (ACPI_FAILURE(status)) 226 return status; 227 228 obj = buffer.pointer; 229 if (!obj || obj->type != ACPI_TYPE_PACKAGE) { 230 dev_err(&device->dev, "Invalid _FIF data\n"); 231 status = -EINVAL; 232 goto err; 233 } 234 235 status = acpi_extract_package(obj, &format, &fif); 236 if (ACPI_FAILURE(status)) { 237 dev_err(&device->dev, "Invalid _FIF element\n"); 238 status = -EINVAL; 239 goto err; 240 } 241 242 fan->fif.revision = fields[0]; 243 fan->fif.fine_grain_ctrl = fields[1]; 244 fan->fif.step_size = fields[2]; 245 fan->fif.low_speed_notification = fields[3]; 246 247 /* If there is a bug in step size and set as 0, change to 1 */ 248 if (!fan->fif.step_size) 249 fan->fif.step_size = 1; 250 /* If step size > 9, change to 9 (by spec valid values 1-9) */ 251 else if (fan->fif.step_size > 9) 252 fan->fif.step_size = 9; 253 err: 254 kfree(obj); 255 return status; 256 } 257 258 static int acpi_fan_speed_cmp(const void *a, const void *b) 259 { 260 const struct acpi_fan_fps *fps1 = a; 261 const struct acpi_fan_fps *fps2 = b; 262 return fps1->speed - fps2->speed; 263 } 264 265 static int acpi_fan_get_fps(struct acpi_device *device) 266 { 267 struct acpi_fan *fan = acpi_driver_data(device); 268 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 269 union acpi_object *obj; 270 acpi_status status; 271 int i; 272 273 status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer); 274 if (ACPI_FAILURE(status)) 275 return status; 276 277 obj = buffer.pointer; 278 if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) { 279 dev_err(&device->dev, "Invalid _FPS data\n"); 280 status = -EINVAL; 281 goto err; 282 } 283 284 fan->fps_count = obj->package.count - 1; /* minus revision field */ 285 fan->fps = devm_kcalloc(&device->dev, 286 fan->fps_count, sizeof(struct acpi_fan_fps), 287 GFP_KERNEL); 288 if (!fan->fps) { 289 dev_err(&device->dev, "Not enough memory\n"); 290 status = -ENOMEM; 291 goto err; 292 } 293 for (i = 0; i < fan->fps_count; i++) { 294 struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; 295 struct acpi_buffer fps = { offsetof(struct acpi_fan_fps, name), 296 &fan->fps[i] }; 297 status = acpi_extract_package(&obj->package.elements[i + 1], 298 &format, &fps); 299 if (ACPI_FAILURE(status)) { 300 dev_err(&device->dev, "Invalid _FPS element\n"); 301 goto err; 302 } 303 } 304 305 /* sort the state array according to fan speed in increase order */ 306 sort(fan->fps, fan->fps_count, sizeof(*fan->fps), 307 acpi_fan_speed_cmp, NULL); 308 309 err: 310 kfree(obj); 311 return status; 312 } 313 314 static int acpi_fan_probe(struct platform_device *pdev) 315 { 316 int result = 0; 317 struct thermal_cooling_device *cdev; 318 struct acpi_fan *fan; 319 struct acpi_device *device = ACPI_COMPANION(&pdev->dev); 320 char *name; 321 322 fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL); 323 if (!fan) { 324 dev_err(&device->dev, "No memory for fan\n"); 325 return -ENOMEM; 326 } 327 device->driver_data = fan; 328 platform_set_drvdata(pdev, fan); 329 330 if (acpi_fan_is_acpi4(device)) { 331 result = acpi_fan_get_fif(device); 332 if (result) 333 return result; 334 335 result = acpi_fan_get_fps(device); 336 if (result) 337 return result; 338 339 result = acpi_fan_create_attributes(device); 340 if (result) 341 return result; 342 343 fan->acpi4 = true; 344 } else { 345 result = acpi_device_update_power(device, NULL); 346 if (result) { 347 dev_err(&device->dev, "Failed to set initial power state\n"); 348 goto err_end; 349 } 350 } 351 352 if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B"))) 353 name = "Fan"; 354 else 355 name = acpi_device_bid(device); 356 357 cdev = thermal_cooling_device_register(name, device, 358 &fan_cooling_ops); 359 if (IS_ERR(cdev)) { 360 result = PTR_ERR(cdev); 361 goto err_end; 362 } 363 364 dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id); 365 366 fan->cdev = cdev; 367 result = sysfs_create_link(&pdev->dev.kobj, 368 &cdev->device.kobj, 369 "thermal_cooling"); 370 if (result) 371 dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n"); 372 373 result = sysfs_create_link(&cdev->device.kobj, 374 &pdev->dev.kobj, 375 "device"); 376 if (result) { 377 dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n"); 378 goto err_end; 379 } 380 381 return 0; 382 383 err_end: 384 if (fan->acpi4) 385 acpi_fan_delete_attributes(device); 386 387 return result; 388 } 389 390 static int acpi_fan_remove(struct platform_device *pdev) 391 { 392 struct acpi_fan *fan = platform_get_drvdata(pdev); 393 394 if (fan->acpi4) { 395 struct acpi_device *device = ACPI_COMPANION(&pdev->dev); 396 397 acpi_fan_delete_attributes(device); 398 } 399 sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling"); 400 sysfs_remove_link(&fan->cdev->device.kobj, "device"); 401 thermal_cooling_device_unregister(fan->cdev); 402 403 return 0; 404 } 405 406 #ifdef CONFIG_PM_SLEEP 407 static int acpi_fan_suspend(struct device *dev) 408 { 409 struct acpi_fan *fan = dev_get_drvdata(dev); 410 if (fan->acpi4) 411 return 0; 412 413 acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0); 414 415 return AE_OK; 416 } 417 418 static int acpi_fan_resume(struct device *dev) 419 { 420 int result; 421 struct acpi_fan *fan = dev_get_drvdata(dev); 422 423 if (fan->acpi4) 424 return 0; 425 426 result = acpi_device_update_power(ACPI_COMPANION(dev), NULL); 427 if (result) 428 dev_err(dev, "Error updating fan power state\n"); 429 430 return result; 431 } 432 433 static const struct dev_pm_ops acpi_fan_pm = { 434 .resume = acpi_fan_resume, 435 .freeze = acpi_fan_suspend, 436 .thaw = acpi_fan_resume, 437 .restore = acpi_fan_resume, 438 }; 439 #define FAN_PM_OPS_PTR (&acpi_fan_pm) 440 441 #else 442 443 #define FAN_PM_OPS_PTR NULL 444 445 #endif 446 447 static struct platform_driver acpi_fan_driver = { 448 .probe = acpi_fan_probe, 449 .remove = acpi_fan_remove, 450 .driver = { 451 .name = "acpi-fan", 452 .acpi_match_table = fan_device_ids, 453 .pm = FAN_PM_OPS_PTR, 454 }, 455 }; 456 457 module_platform_driver(acpi_fan_driver); 458 459 MODULE_AUTHOR("Paul Diefenbaugh"); 460 MODULE_DESCRIPTION("ACPI Fan Driver"); 461 MODULE_LICENSE("GPL"); 462