1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Lenovo Other Mode WMI interface driver.
4 *
5 * This driver uses the fw_attributes class to expose the various WMI functions
6 * provided by the "Other Mode" WMI interface. This enables CPU and GPU power
7 * limit as well as various other attributes for devices that fall under the
8 * "Gaming Series" of Lenovo laptop devices. Each attribute exposed by the
9 * "Other Mode" interface has a corresponding Capability Data struct that
10 * allows the driver to probe details about the attribute such as if it is
11 * supported by the hardware, the default_value, max_value, min_value, and step
12 * increment.
13 *
14 * These attributes typically don't fit anywhere else in the sysfs and are set
15 * in Windows using one of Lenovo's multiple user applications.
16 *
17 * Copyright (C) 2025 Derek J. Clark <derekjohn.clark@gmail.com>
18 */
19
20 #include <linux/acpi.h>
21 #include <linux/bitfield.h>
22 #include <linux/cleanup.h>
23 #include <linux/component.h>
24 #include <linux/container_of.h>
25 #include <linux/device.h>
26 #include <linux/export.h>
27 #include <linux/gfp_types.h>
28 #include <linux/idr.h>
29 #include <linux/kdev_t.h>
30 #include <linux/kobject.h>
31 #include <linux/module.h>
32 #include <linux/notifier.h>
33 #include <linux/platform_profile.h>
34 #include <linux/types.h>
35 #include <linux/wmi.h>
36
37 #include "wmi-capdata01.h"
38 #include "wmi-events.h"
39 #include "wmi-gamezone.h"
40 #include "wmi-helpers.h"
41 #include "wmi-other.h"
42 #include "../firmware_attributes_class.h"
43
44 #define LENOVO_OTHER_MODE_GUID "DC2A8805-3A8C-41BA-A6F7-092E0089CD3B"
45
46 #define LWMI_DEVICE_ID_CPU 0x01
47
48 #define LWMI_FEATURE_ID_CPU_SPPT 0x01
49 #define LWMI_FEATURE_ID_CPU_SPL 0x02
50 #define LWMI_FEATURE_ID_CPU_FPPT 0x03
51
52 #define LWMI_TYPE_ID_NONE 0x00
53
54 #define LWMI_FEATURE_VALUE_GET 17
55 #define LWMI_FEATURE_VALUE_SET 18
56
57 #define LWMI_ATTR_DEV_ID_MASK GENMASK(31, 24)
58 #define LWMI_ATTR_FEAT_ID_MASK GENMASK(23, 16)
59 #define LWMI_ATTR_MODE_ID_MASK GENMASK(15, 8)
60 #define LWMI_ATTR_TYPE_ID_MASK GENMASK(7, 0)
61
62 #define LWMI_OM_FW_ATTR_BASE_PATH "lenovo-wmi-other"
63
64 static BLOCKING_NOTIFIER_HEAD(om_chain_head);
65 static DEFINE_IDA(lwmi_om_ida);
66
67 enum attribute_property {
68 DEFAULT_VAL,
69 MAX_VAL,
70 MIN_VAL,
71 STEP_VAL,
72 SUPPORTED,
73 };
74
75 struct lwmi_om_priv {
76 struct component_master_ops *ops;
77 struct cd01_list *cd01_list; /* only valid after capdata01 bind */
78 struct device *fw_attr_dev;
79 struct kset *fw_attr_kset;
80 struct notifier_block nb;
81 struct wmi_device *wdev;
82 int ida_id;
83 };
84
85 struct tunable_attr_01 {
86 struct capdata01 *capdata;
87 struct device *dev;
88 u32 feature_id;
89 u32 device_id;
90 u32 type_id;
91 };
92
93 static struct tunable_attr_01 ppt_pl1_spl = {
94 .device_id = LWMI_DEVICE_ID_CPU,
95 .feature_id = LWMI_FEATURE_ID_CPU_SPL,
96 .type_id = LWMI_TYPE_ID_NONE,
97 };
98
99 static struct tunable_attr_01 ppt_pl2_sppt = {
100 .device_id = LWMI_DEVICE_ID_CPU,
101 .feature_id = LWMI_FEATURE_ID_CPU_SPPT,
102 .type_id = LWMI_TYPE_ID_NONE,
103 };
104
105 static struct tunable_attr_01 ppt_pl3_fppt = {
106 .device_id = LWMI_DEVICE_ID_CPU,
107 .feature_id = LWMI_FEATURE_ID_CPU_FPPT,
108 .type_id = LWMI_TYPE_ID_NONE,
109 };
110
111 struct capdata01_attr_group {
112 const struct attribute_group *attr_group;
113 struct tunable_attr_01 *tunable_attr;
114 };
115
116 /**
117 * lwmi_om_register_notifier() - Add a notifier to the blocking notifier chain
118 * @nb: The notifier_block struct to register
119 *
120 * Call blocking_notifier_chain_register to register the notifier block to the
121 * lenovo-wmi-other driver notifier chain.
122 *
123 * Return: 0 on success, %-EEXIST on error.
124 */
lwmi_om_register_notifier(struct notifier_block * nb)125 int lwmi_om_register_notifier(struct notifier_block *nb)
126 {
127 return blocking_notifier_chain_register(&om_chain_head, nb);
128 }
129 EXPORT_SYMBOL_NS_GPL(lwmi_om_register_notifier, "LENOVO_WMI_OTHER");
130
131 /**
132 * lwmi_om_unregister_notifier() - Remove a notifier from the blocking notifier
133 * chain.
134 * @nb: The notifier_block struct to register
135 *
136 * Call blocking_notifier_chain_unregister to unregister the notifier block from the
137 * lenovo-wmi-other driver notifier chain.
138 *
139 * Return: 0 on success, %-ENOENT on error.
140 */
lwmi_om_unregister_notifier(struct notifier_block * nb)141 int lwmi_om_unregister_notifier(struct notifier_block *nb)
142 {
143 return blocking_notifier_chain_unregister(&om_chain_head, nb);
144 }
145 EXPORT_SYMBOL_NS_GPL(lwmi_om_unregister_notifier, "LENOVO_WMI_OTHER");
146
147 /**
148 * devm_lwmi_om_unregister_notifier() - Remove a notifier from the blocking
149 * notifier chain.
150 * @data: Void pointer to the notifier_block struct to register.
151 *
152 * Call lwmi_om_unregister_notifier to unregister the notifier block from the
153 * lenovo-wmi-other driver notifier chain.
154 *
155 * Return: 0 on success, %-ENOENT on error.
156 */
devm_lwmi_om_unregister_notifier(void * data)157 static void devm_lwmi_om_unregister_notifier(void *data)
158 {
159 struct notifier_block *nb = data;
160
161 lwmi_om_unregister_notifier(nb);
162 }
163
164 /**
165 * devm_lwmi_om_register_notifier() - Add a notifier to the blocking notifier
166 * chain.
167 * @dev: The parent device of the notifier_block struct.
168 * @nb: The notifier_block struct to register
169 *
170 * Call lwmi_om_register_notifier to register the notifier block to the
171 * lenovo-wmi-other driver notifier chain. Then add devm_lwmi_om_unregister_notifier
172 * as a device managed action to automatically unregister the notifier block
173 * upon parent device removal.
174 *
175 * Return: 0 on success, or an error code.
176 */
devm_lwmi_om_register_notifier(struct device * dev,struct notifier_block * nb)177 int devm_lwmi_om_register_notifier(struct device *dev,
178 struct notifier_block *nb)
179 {
180 int ret;
181
182 ret = lwmi_om_register_notifier(nb);
183 if (ret < 0)
184 return ret;
185
186 return devm_add_action_or_reset(dev, devm_lwmi_om_unregister_notifier,
187 nb);
188 }
189 EXPORT_SYMBOL_NS_GPL(devm_lwmi_om_register_notifier, "LENOVO_WMI_OTHER");
190
191 /**
192 * lwmi_om_notifier_call() - Call functions for the notifier call chain.
193 * @mode: Pointer to a thermal mode enum to retrieve the data from.
194 *
195 * Call blocking_notifier_call_chain to retrieve the thermal mode from the
196 * lenovo-wmi-gamezone driver.
197 *
198 * Return: 0 on success, or an error code.
199 */
lwmi_om_notifier_call(enum thermal_mode * mode)200 static int lwmi_om_notifier_call(enum thermal_mode *mode)
201 {
202 int ret;
203
204 ret = blocking_notifier_call_chain(&om_chain_head,
205 LWMI_GZ_GET_THERMAL_MODE, &mode);
206 if ((ret & ~NOTIFY_STOP_MASK) != NOTIFY_OK)
207 return -EINVAL;
208
209 return 0;
210 }
211
212 /* Attribute Methods */
213
214 /**
215 * int_type_show() - Emit the data type for an integer attribute
216 * @kobj: Pointer to the driver object.
217 * @kattr: Pointer to the attribute calling this function.
218 * @buf: The buffer to write to.
219 *
220 * Return: Number of characters written to buf.
221 */
int_type_show(struct kobject * kobj,struct kobj_attribute * kattr,char * buf)222 static ssize_t int_type_show(struct kobject *kobj, struct kobj_attribute *kattr,
223 char *buf)
224 {
225 return sysfs_emit(buf, "integer\n");
226 }
227
228 /**
229 * attr_capdata01_show() - Get the value of the specified attribute property
230 *
231 * @kobj: Pointer to the driver object.
232 * @kattr: Pointer to the attribute calling this function.
233 * @buf: The buffer to write to.
234 * @tunable_attr: The attribute to be read.
235 * @prop: The property of this attribute to be read.
236 *
237 * Retrieves the given property from the capability data 01 struct for the
238 * specified attribute's "custom" thermal mode. This function is intended
239 * to be generic so it can be called from any integer attributes "_show"
240 * function.
241 *
242 * If the WMI is success the sysfs attribute is notified.
243 *
244 * Return: Either number of characters written to buf, or an error code.
245 */
attr_capdata01_show(struct kobject * kobj,struct kobj_attribute * kattr,char * buf,struct tunable_attr_01 * tunable_attr,enum attribute_property prop)246 static ssize_t attr_capdata01_show(struct kobject *kobj,
247 struct kobj_attribute *kattr, char *buf,
248 struct tunable_attr_01 *tunable_attr,
249 enum attribute_property prop)
250 {
251 struct lwmi_om_priv *priv = dev_get_drvdata(tunable_attr->dev);
252 struct capdata01 capdata;
253 u32 attribute_id;
254 int value, ret;
255
256 attribute_id =
257 FIELD_PREP(LWMI_ATTR_DEV_ID_MASK, tunable_attr->device_id) |
258 FIELD_PREP(LWMI_ATTR_FEAT_ID_MASK, tunable_attr->feature_id) |
259 FIELD_PREP(LWMI_ATTR_MODE_ID_MASK,
260 LWMI_GZ_THERMAL_MODE_CUSTOM) |
261 FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, tunable_attr->type_id);
262
263 ret = lwmi_cd01_get_data(priv->cd01_list, attribute_id, &capdata);
264 if (ret)
265 return ret;
266
267 switch (prop) {
268 case DEFAULT_VAL:
269 value = capdata.default_value;
270 break;
271 case MAX_VAL:
272 value = capdata.max_value;
273 break;
274 case MIN_VAL:
275 value = capdata.min_value;
276 break;
277 case STEP_VAL:
278 value = capdata.step;
279 break;
280 default:
281 return -EINVAL;
282 }
283
284 return sysfs_emit(buf, "%d\n", value);
285 }
286
287 /**
288 * attr_current_value_store() - Set the current value of the given attribute
289 * @kobj: Pointer to the driver object.
290 * @kattr: Pointer to the attribute calling this function.
291 * @buf: The buffer to read from, this is parsed to `int` type.
292 * @count: Required by sysfs attribute macros, pass in from the callee attr.
293 * @tunable_attr: The attribute to be stored.
294 *
295 * Sets the value of the given attribute when operating under the "custom"
296 * smartfan profile. The current smartfan profile is retrieved from the
297 * lenovo-wmi-gamezone driver and error is returned if the result is not
298 * "custom". This function is intended to be generic so it can be called from
299 * any integer attribute's "_store" function. The integer to be sent to the WMI
300 * method is range checked and an error code is returned if out of range.
301 *
302 * If the value is valid and WMI is success, then the sysfs attribute is
303 * notified.
304 *
305 * Return: Either count, or an error code.
306 */
attr_current_value_store(struct kobject * kobj,struct kobj_attribute * kattr,const char * buf,size_t count,struct tunable_attr_01 * tunable_attr)307 static ssize_t attr_current_value_store(struct kobject *kobj,
308 struct kobj_attribute *kattr,
309 const char *buf, size_t count,
310 struct tunable_attr_01 *tunable_attr)
311 {
312 struct lwmi_om_priv *priv = dev_get_drvdata(tunable_attr->dev);
313 struct wmi_method_args_32 args;
314 struct capdata01 capdata;
315 enum thermal_mode mode;
316 u32 attribute_id;
317 u32 value;
318 int ret;
319
320 ret = lwmi_om_notifier_call(&mode);
321 if (ret)
322 return ret;
323
324 if (mode != LWMI_GZ_THERMAL_MODE_CUSTOM)
325 return -EBUSY;
326
327 attribute_id =
328 FIELD_PREP(LWMI_ATTR_DEV_ID_MASK, tunable_attr->device_id) |
329 FIELD_PREP(LWMI_ATTR_FEAT_ID_MASK, tunable_attr->feature_id) |
330 FIELD_PREP(LWMI_ATTR_MODE_ID_MASK, mode) |
331 FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, tunable_attr->type_id);
332
333 ret = lwmi_cd01_get_data(priv->cd01_list, attribute_id, &capdata);
334 if (ret)
335 return ret;
336
337 ret = kstrtouint(buf, 10, &value);
338 if (ret)
339 return ret;
340
341 if (value < capdata.min_value || value > capdata.max_value)
342 return -EINVAL;
343
344 args.arg0 = attribute_id;
345 args.arg1 = value;
346
347 ret = lwmi_dev_evaluate_int(priv->wdev, 0x0, LWMI_FEATURE_VALUE_SET,
348 (unsigned char *)&args, sizeof(args), NULL);
349 if (ret)
350 return ret;
351
352 return count;
353 };
354
355 /**
356 * attr_current_value_show() - Get the current value of the given attribute
357 * @kobj: Pointer to the driver object.
358 * @kattr: Pointer to the attribute calling this function.
359 * @buf: The buffer to write to.
360 * @tunable_attr: The attribute to be read.
361 *
362 * Retrieves the value of the given attribute for the current smartfan profile.
363 * The current smartfan profile is retrieved from the lenovo-wmi-gamezone driver.
364 * This function is intended to be generic so it can be called from any integer
365 * attribute's "_show" function.
366 *
367 * If the WMI is success the sysfs attribute is notified.
368 *
369 * Return: Either number of characters written to buf, or an error code.
370 */
attr_current_value_show(struct kobject * kobj,struct kobj_attribute * kattr,char * buf,struct tunable_attr_01 * tunable_attr)371 static ssize_t attr_current_value_show(struct kobject *kobj,
372 struct kobj_attribute *kattr, char *buf,
373 struct tunable_attr_01 *tunable_attr)
374 {
375 struct lwmi_om_priv *priv = dev_get_drvdata(tunable_attr->dev);
376 struct wmi_method_args_32 args;
377 enum thermal_mode mode;
378 u32 attribute_id;
379 int retval;
380 int ret;
381
382 ret = lwmi_om_notifier_call(&mode);
383 if (ret)
384 return ret;
385
386 attribute_id =
387 FIELD_PREP(LWMI_ATTR_DEV_ID_MASK, tunable_attr->device_id) |
388 FIELD_PREP(LWMI_ATTR_FEAT_ID_MASK, tunable_attr->feature_id) |
389 FIELD_PREP(LWMI_ATTR_MODE_ID_MASK, mode) |
390 FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, tunable_attr->type_id);
391
392 args.arg0 = attribute_id;
393
394 ret = lwmi_dev_evaluate_int(priv->wdev, 0x0, LWMI_FEATURE_VALUE_GET,
395 (unsigned char *)&args, sizeof(args),
396 &retval);
397 if (ret)
398 return ret;
399
400 return sysfs_emit(buf, "%d\n", retval);
401 }
402
403 /* Lenovo WMI Other Mode Attribute macros */
404 #define __LWMI_ATTR_RO(_func, _name) \
405 { \
406 .attr = { .name = __stringify(_name), .mode = 0444 }, \
407 .show = _func##_##_name##_show, \
408 }
409
410 #define __LWMI_ATTR_RO_AS(_name, _show) \
411 { \
412 .attr = { .name = __stringify(_name), .mode = 0444 }, \
413 .show = _show, \
414 }
415
416 #define __LWMI_ATTR_RW(_func, _name) \
417 __ATTR(_name, 0644, _func##_##_name##_show, _func##_##_name##_store)
418
419 /* Shows a formatted static variable */
420 #define __LWMI_ATTR_SHOW_FMT(_prop, _attrname, _fmt, _val) \
421 static ssize_t _attrname##_##_prop##_show( \
422 struct kobject *kobj, struct kobj_attribute *kattr, char *buf) \
423 { \
424 return sysfs_emit(buf, _fmt, _val); \
425 } \
426 static struct kobj_attribute attr_##_attrname##_##_prop = \
427 __LWMI_ATTR_RO(_attrname, _prop)
428
429 /* Attribute current value read/write */
430 #define __LWMI_TUNABLE_CURRENT_VALUE_CAP01(_attrname) \
431 static ssize_t _attrname##_current_value_store( \
432 struct kobject *kobj, struct kobj_attribute *kattr, \
433 const char *buf, size_t count) \
434 { \
435 return attr_current_value_store(kobj, kattr, buf, count, \
436 &_attrname); \
437 } \
438 static ssize_t _attrname##_current_value_show( \
439 struct kobject *kobj, struct kobj_attribute *kattr, char *buf) \
440 { \
441 return attr_current_value_show(kobj, kattr, buf, &_attrname); \
442 } \
443 static struct kobj_attribute attr_##_attrname##_current_value = \
444 __LWMI_ATTR_RW(_attrname, current_value)
445
446 /* Attribute property read only */
447 #define __LWMI_TUNABLE_RO_CAP01(_prop, _attrname, _prop_type) \
448 static ssize_t _attrname##_##_prop##_show( \
449 struct kobject *kobj, struct kobj_attribute *kattr, char *buf) \
450 { \
451 return attr_capdata01_show(kobj, kattr, buf, &_attrname, \
452 _prop_type); \
453 } \
454 static struct kobj_attribute attr_##_attrname##_##_prop = \
455 __LWMI_ATTR_RO(_attrname, _prop)
456
457 #define LWMI_ATTR_GROUP_TUNABLE_CAP01(_attrname, _fsname, _dispname) \
458 __LWMI_TUNABLE_CURRENT_VALUE_CAP01(_attrname); \
459 __LWMI_TUNABLE_RO_CAP01(default_value, _attrname, DEFAULT_VAL); \
460 __LWMI_ATTR_SHOW_FMT(display_name, _attrname, "%s\n", _dispname); \
461 __LWMI_TUNABLE_RO_CAP01(max_value, _attrname, MAX_VAL); \
462 __LWMI_TUNABLE_RO_CAP01(min_value, _attrname, MIN_VAL); \
463 __LWMI_TUNABLE_RO_CAP01(scalar_increment, _attrname, STEP_VAL); \
464 static struct kobj_attribute attr_##_attrname##_type = \
465 __LWMI_ATTR_RO_AS(type, int_type_show); \
466 static struct attribute *_attrname##_attrs[] = { \
467 &attr_##_attrname##_current_value.attr, \
468 &attr_##_attrname##_default_value.attr, \
469 &attr_##_attrname##_display_name.attr, \
470 &attr_##_attrname##_max_value.attr, \
471 &attr_##_attrname##_min_value.attr, \
472 &attr_##_attrname##_scalar_increment.attr, \
473 &attr_##_attrname##_type.attr, \
474 NULL, \
475 }; \
476 static const struct attribute_group _attrname##_attr_group = { \
477 .name = _fsname, .attrs = _attrname##_attrs \
478 }
479
480 LWMI_ATTR_GROUP_TUNABLE_CAP01(ppt_pl1_spl, "ppt_pl1_spl",
481 "Set the CPU sustained power limit");
482 LWMI_ATTR_GROUP_TUNABLE_CAP01(ppt_pl2_sppt, "ppt_pl2_sppt",
483 "Set the CPU slow package power tracking limit");
484 LWMI_ATTR_GROUP_TUNABLE_CAP01(ppt_pl3_fppt, "ppt_pl3_fppt",
485 "Set the CPU fast package power tracking limit");
486
487 static struct capdata01_attr_group cd01_attr_groups[] = {
488 { &ppt_pl1_spl_attr_group, &ppt_pl1_spl },
489 { &ppt_pl2_sppt_attr_group, &ppt_pl2_sppt },
490 { &ppt_pl3_fppt_attr_group, &ppt_pl3_fppt },
491 {},
492 };
493
494 /**
495 * lwmi_om_fw_attr_add() - Register all firmware_attributes_class members
496 * @priv: The Other Mode driver data.
497 *
498 * Return: Either 0, or an error code.
499 */
lwmi_om_fw_attr_add(struct lwmi_om_priv * priv)500 static int lwmi_om_fw_attr_add(struct lwmi_om_priv *priv)
501 {
502 unsigned int i;
503 int err;
504
505 priv->ida_id = ida_alloc(&lwmi_om_ida, GFP_KERNEL);
506 if (priv->ida_id < 0)
507 return priv->ida_id;
508
509 priv->fw_attr_dev = device_create(&firmware_attributes_class, NULL,
510 MKDEV(0, 0), NULL, "%s-%u",
511 LWMI_OM_FW_ATTR_BASE_PATH,
512 priv->ida_id);
513 if (IS_ERR(priv->fw_attr_dev)) {
514 err = PTR_ERR(priv->fw_attr_dev);
515 goto err_free_ida;
516 }
517
518 priv->fw_attr_kset = kset_create_and_add("attributes", NULL,
519 &priv->fw_attr_dev->kobj);
520 if (!priv->fw_attr_kset) {
521 err = -ENOMEM;
522 goto err_destroy_classdev;
523 }
524
525 for (i = 0; i < ARRAY_SIZE(cd01_attr_groups) - 1; i++) {
526 err = sysfs_create_group(&priv->fw_attr_kset->kobj,
527 cd01_attr_groups[i].attr_group);
528 if (err)
529 goto err_remove_groups;
530
531 cd01_attr_groups[i].tunable_attr->dev = &priv->wdev->dev;
532 }
533 return 0;
534
535 err_remove_groups:
536 while (i--)
537 sysfs_remove_group(&priv->fw_attr_kset->kobj,
538 cd01_attr_groups[i].attr_group);
539
540 kset_unregister(priv->fw_attr_kset);
541
542 err_destroy_classdev:
543 device_unregister(priv->fw_attr_dev);
544
545 err_free_ida:
546 ida_free(&lwmi_om_ida, priv->ida_id);
547 return err;
548 }
549
550 /**
551 * lwmi_om_fw_attr_remove() - Unregister all capability data attribute groups
552 * @priv: the lenovo-wmi-other driver data.
553 */
lwmi_om_fw_attr_remove(struct lwmi_om_priv * priv)554 static void lwmi_om_fw_attr_remove(struct lwmi_om_priv *priv)
555 {
556 for (unsigned int i = 0; i < ARRAY_SIZE(cd01_attr_groups) - 1; i++)
557 sysfs_remove_group(&priv->fw_attr_kset->kobj,
558 cd01_attr_groups[i].attr_group);
559
560 kset_unregister(priv->fw_attr_kset);
561 device_unregister(priv->fw_attr_dev);
562 }
563
564 /**
565 * lwmi_om_master_bind() - Bind all components of the other mode driver
566 * @dev: The lenovo-wmi-other driver basic device.
567 *
568 * Call component_bind_all to bind the lenovo-wmi-capdata01 driver to the
569 * lenovo-wmi-other master driver. On success, assign the capability data 01
570 * list pointer to the driver data struct for later access. This pointer
571 * is only valid while the capdata01 interface exists. Finally, register all
572 * firmware attribute groups.
573 *
574 * Return: 0 on success, or an error code.
575 */
lwmi_om_master_bind(struct device * dev)576 static int lwmi_om_master_bind(struct device *dev)
577 {
578 struct lwmi_om_priv *priv = dev_get_drvdata(dev);
579 struct cd01_list *tmp_list;
580 int ret;
581
582 ret = component_bind_all(dev, &tmp_list);
583 if (ret)
584 return ret;
585
586 priv->cd01_list = tmp_list;
587 if (!priv->cd01_list)
588 return -ENODEV;
589
590 return lwmi_om_fw_attr_add(priv);
591 }
592
593 /**
594 * lwmi_om_master_unbind() - Unbind all components of the other mode driver
595 * @dev: The lenovo-wmi-other driver basic device
596 *
597 * Unregister all capability data attribute groups. Then call
598 * component_unbind_all to unbind the lenovo-wmi-capdata01 driver from the
599 * lenovo-wmi-other master driver. Finally, free the IDA for this device.
600 */
lwmi_om_master_unbind(struct device * dev)601 static void lwmi_om_master_unbind(struct device *dev)
602 {
603 struct lwmi_om_priv *priv = dev_get_drvdata(dev);
604
605 lwmi_om_fw_attr_remove(priv);
606 component_unbind_all(dev, NULL);
607 }
608
609 static const struct component_master_ops lwmi_om_master_ops = {
610 .bind = lwmi_om_master_bind,
611 .unbind = lwmi_om_master_unbind,
612 };
613
lwmi_other_probe(struct wmi_device * wdev,const void * context)614 static int lwmi_other_probe(struct wmi_device *wdev, const void *context)
615 {
616 struct component_match *master_match = NULL;
617 struct lwmi_om_priv *priv;
618
619 priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
620 if (!priv)
621 return -ENOMEM;
622
623 priv->wdev = wdev;
624 dev_set_drvdata(&wdev->dev, priv);
625
626 component_match_add(&wdev->dev, &master_match, lwmi_cd01_match, NULL);
627 if (IS_ERR(master_match))
628 return PTR_ERR(master_match);
629
630 return component_master_add_with_match(&wdev->dev, &lwmi_om_master_ops,
631 master_match);
632 }
633
lwmi_other_remove(struct wmi_device * wdev)634 static void lwmi_other_remove(struct wmi_device *wdev)
635 {
636 struct lwmi_om_priv *priv = dev_get_drvdata(&wdev->dev);
637
638 component_master_del(&wdev->dev, &lwmi_om_master_ops);
639 ida_free(&lwmi_om_ida, priv->ida_id);
640 }
641
642 static const struct wmi_device_id lwmi_other_id_table[] = {
643 { LENOVO_OTHER_MODE_GUID, NULL },
644 {}
645 };
646
647 static struct wmi_driver lwmi_other_driver = {
648 .driver = {
649 .name = "lenovo_wmi_other",
650 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
651 },
652 .id_table = lwmi_other_id_table,
653 .probe = lwmi_other_probe,
654 .remove = lwmi_other_remove,
655 .no_singleton = true,
656 };
657
658 module_wmi_driver(lwmi_other_driver);
659
660 MODULE_IMPORT_NS("LENOVO_WMI_CD01");
661 MODULE_IMPORT_NS("LENOVO_WMI_HELPERS");
662 MODULE_DEVICE_TABLE(wmi, lwmi_other_id_table);
663 MODULE_AUTHOR("Derek J. Clark <derekjohn.clark@gmail.com>");
664 MODULE_DESCRIPTION("Lenovo Other Mode WMI Driver");
665 MODULE_LICENSE("GPL");
666