Merge tag 'locking_urgent_for_v6.2_rc2' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-block.git] / drivers / soundwire / intel_auxdevice.c
1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-22 Intel Corporation.
3
4 /*
5  * Soundwire Intel Manager Driver
6  */
7
8 #include <linux/acpi.h>
9 #include <linux/debugfs.h>
10 #include <linux/delay.h>
11 #include <linux/module.h>
12 #include <linux/interrupt.h>
13 #include <linux/io.h>
14 #include <linux/auxiliary_bus.h>
15 #include <sound/pcm_params.h>
16 #include <linux/pm_runtime.h>
17 #include <sound/soc.h>
18 #include <linux/soundwire/sdw_registers.h>
19 #include <linux/soundwire/sdw.h>
20 #include <linux/soundwire/sdw_intel.h>
21 #include "cadence_master.h"
22 #include "bus.h"
23 #include "intel.h"
24 #include "intel_auxdevice.h"
25
26 /* IDA min selected to avoid conflicts with HDaudio/iDISP SDI values */
27 #define INTEL_DEV_NUM_IDA_MIN           4
28
29 #define INTEL_MASTER_SUSPEND_DELAY_MS   3000
30
31 /*
32  * debug/config flags for the Intel SoundWire Master.
33  *
34  * Since we may have multiple masters active, we can have up to 8
35  * flags reused in each byte, with master0 using the ls-byte, etc.
36  */
37
38 #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME             BIT(0)
39 #define SDW_INTEL_MASTER_DISABLE_CLOCK_STOP             BIT(1)
40 #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE        BIT(2)
41 #define SDW_INTEL_MASTER_DISABLE_MULTI_LINK             BIT(3)
42
43 static int md_flags;
44 module_param_named(sdw_md_flags, md_flags, int, 0444);
45 MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)");
46
47 static int generic_pre_bank_switch(struct sdw_bus *bus)
48 {
49         struct sdw_cdns *cdns = bus_to_cdns(bus);
50         struct sdw_intel *sdw = cdns_to_intel(cdns);
51
52         return sdw->link_res->hw_ops->pre_bank_switch(sdw);
53 }
54
55 static int generic_post_bank_switch(struct sdw_bus *bus)
56 {
57         struct sdw_cdns *cdns = bus_to_cdns(bus);
58         struct sdw_intel *sdw = cdns_to_intel(cdns);
59
60         return sdw->link_res->hw_ops->post_bank_switch(sdw);
61 }
62
63 static int sdw_master_read_intel_prop(struct sdw_bus *bus)
64 {
65         struct sdw_master_prop *prop = &bus->prop;
66         struct fwnode_handle *link;
67         char name[32];
68         u32 quirk_mask;
69
70         /* Find master handle */
71         snprintf(name, sizeof(name),
72                  "mipi-sdw-link-%d-subproperties", bus->link_id);
73
74         link = device_get_named_child_node(bus->dev, name);
75         if (!link) {
76                 dev_err(bus->dev, "Master node %s not found\n", name);
77                 return -EIO;
78         }
79
80         fwnode_property_read_u32(link,
81                                  "intel-sdw-ip-clock",
82                                  &prop->mclk_freq);
83
84         /* the values reported by BIOS are the 2x clock, not the bus clock */
85         prop->mclk_freq /= 2;
86
87         fwnode_property_read_u32(link,
88                                  "intel-quirk-mask",
89                                  &quirk_mask);
90
91         if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
92                 prop->hw_disabled = true;
93
94         prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |
95                 SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;
96
97         return 0;
98 }
99
100 static int intel_prop_read(struct sdw_bus *bus)
101 {
102         /* Initialize with default handler to read all DisCo properties */
103         sdw_master_read_prop(bus);
104
105         /* read Intel-specific properties */
106         sdw_master_read_intel_prop(bus);
107
108         return 0;
109 }
110
111 static struct sdw_master_ops sdw_intel_ops = {
112         .read_prop = intel_prop_read,
113         .override_adr = sdw_dmi_override_adr,
114         .xfer_msg = cdns_xfer_msg,
115         .xfer_msg_defer = cdns_xfer_msg_defer,
116         .reset_page_addr = cdns_reset_page_addr,
117         .set_bus_conf = cdns_bus_conf,
118         .pre_bank_switch = generic_pre_bank_switch,
119         .post_bank_switch = generic_post_bank_switch,
120         .read_ping_status = cdns_read_ping_status,
121 };
122
123 /*
124  * probe and init (aux_dev_id argument is required by function prototype but not used)
125  */
126 static int intel_link_probe(struct auxiliary_device *auxdev,
127                             const struct auxiliary_device_id *aux_dev_id)
128
129 {
130         struct device *dev = &auxdev->dev;
131         struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
132         struct sdw_intel *sdw;
133         struct sdw_cdns *cdns;
134         struct sdw_bus *bus;
135         int ret;
136
137         sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);
138         if (!sdw)
139                 return -ENOMEM;
140
141         cdns = &sdw->cdns;
142         bus = &cdns->bus;
143
144         sdw->instance = auxdev->id;
145         sdw->link_res = &ldev->link_res;
146         cdns->dev = dev;
147         cdns->registers = sdw->link_res->registers;
148         cdns->instance = sdw->instance;
149         cdns->msg_count = 0;
150
151         bus->link_id = auxdev->id;
152         bus->dev_num_ida_min = INTEL_DEV_NUM_IDA_MIN;
153         bus->clk_stop_timeout = 1;
154
155         sdw_cdns_probe(cdns);
156
157         /* Set ops */
158         bus->ops = &sdw_intel_ops;
159
160         /* set driver data, accessed by snd_soc_dai_get_drvdata() */
161         auxiliary_set_drvdata(auxdev, cdns);
162
163         /* use generic bandwidth allocation algorithm */
164         sdw->cdns.bus.compute_params = sdw_compute_params;
165
166         /* avoid resuming from pm_runtime suspend if it's not required */
167         dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND);
168
169         ret = sdw_bus_master_add(bus, dev, dev->fwnode);
170         if (ret) {
171                 dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
172                 return ret;
173         }
174
175         if (bus->prop.hw_disabled)
176                 dev_info(dev,
177                          "SoundWire master %d is disabled, will be ignored\n",
178                          bus->link_id);
179         /*
180          * Ignore BIOS err_threshold, it's a really bad idea when dealing
181          * with multiple hardware synchronized links
182          */
183         bus->prop.err_threshold = 0;
184
185         return 0;
186 }
187
188 int intel_link_startup(struct auxiliary_device *auxdev)
189 {
190         struct device *dev = &auxdev->dev;
191         struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
192         struct sdw_intel *sdw = cdns_to_intel(cdns);
193         struct sdw_bus *bus = &cdns->bus;
194         int link_flags;
195         bool multi_link;
196         u32 clock_stop_quirks;
197         int ret;
198
199         if (bus->prop.hw_disabled) {
200                 dev_info(dev,
201                          "SoundWire master %d is disabled, ignoring\n",
202                          sdw->instance);
203                 return 0;
204         }
205
206         link_flags = md_flags >> (bus->link_id * 8);
207         multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
208         if (!multi_link) {
209                 dev_dbg(dev, "Multi-link is disabled\n");
210         } else {
211                 /*
212                  * hardware-based synchronization is required regardless
213                  * of the number of segments used by a stream: SSP-based
214                  * synchronization is gated by gsync when the multi-master
215                  * mode is set.
216                  */
217                 bus->hw_sync_min_links = 1;
218         }
219         bus->multi_link = multi_link;
220
221         /* Initialize shim, controller */
222         ret = sdw_intel_link_power_up(sdw);
223         if (ret)
224                 goto err_init;
225
226         /* Register DAIs */
227         ret = sdw_intel_register_dai(sdw);
228         if (ret) {
229                 dev_err(dev, "DAI registration failed: %d\n", ret);
230                 goto err_power_up;
231         }
232
233         sdw_intel_debugfs_init(sdw);
234
235         /* start bus */
236         ret = sdw_intel_start_bus(sdw);
237         if (ret) {
238                 dev_err(dev, "bus start failed: %d\n", ret);
239                 goto err_power_up;
240         }
241
242         /* Enable runtime PM */
243         if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
244                 pm_runtime_set_autosuspend_delay(dev,
245                                                  INTEL_MASTER_SUSPEND_DELAY_MS);
246                 pm_runtime_use_autosuspend(dev);
247                 pm_runtime_mark_last_busy(dev);
248
249                 pm_runtime_set_active(dev);
250                 pm_runtime_enable(dev);
251         }
252
253         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
254         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
255                 /*
256                  * To keep the clock running we need to prevent
257                  * pm_runtime suspend from happening by increasing the
258                  * reference count.
259                  * This quirk is specified by the parent PCI device in
260                  * case of specific latency requirements. It will have
261                  * no effect if pm_runtime is disabled by the user via
262                  * a module parameter for testing purposes.
263                  */
264                 pm_runtime_get_noresume(dev);
265         }
266
267         /*
268          * The runtime PM status of Slave devices is "Unsupported"
269          * until they report as ATTACHED. If they don't, e.g. because
270          * there are no Slave devices populated or if the power-on is
271          * delayed or dependent on a power switch, the Master will
272          * remain active and prevent its parent from suspending.
273          *
274          * Conditionally force the pm_runtime core to re-evaluate the
275          * Master status in the absence of any Slave activity. A quirk
276          * is provided to e.g. deal with Slaves that may be powered on
277          * with a delay. A more complete solution would require the
278          * definition of Master properties.
279          */
280         if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
281                 pm_runtime_idle(dev);
282
283         sdw->startup_done = true;
284         return 0;
285
286 err_power_up:
287         sdw_intel_link_power_down(sdw);
288 err_init:
289         return ret;
290 }
291
292 static void intel_link_remove(struct auxiliary_device *auxdev)
293 {
294         struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
295         struct sdw_intel *sdw = cdns_to_intel(cdns);
296         struct sdw_bus *bus = &cdns->bus;
297
298         /*
299          * Since pm_runtime is already disabled, we don't decrease
300          * the refcount when the clock_stop_quirk is
301          * SDW_INTEL_CLK_STOP_NOT_ALLOWED
302          */
303         if (!bus->prop.hw_disabled) {
304                 sdw_intel_debugfs_exit(sdw);
305                 sdw_cdns_enable_interrupt(cdns, false);
306         }
307         sdw_bus_master_delete(bus);
308 }
309
310 int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
311 {
312         struct device *dev = &auxdev->dev;
313         struct sdw_intel *sdw;
314         struct sdw_bus *bus;
315
316         sdw = auxiliary_get_drvdata(auxdev);
317         bus = &sdw->cdns.bus;
318
319         if (bus->prop.hw_disabled || !sdw->startup_done) {
320                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
321                         bus->link_id);
322                 return 0;
323         }
324
325         if (!sdw_intel_shim_check_wake(sdw))
326                 return 0;
327
328         /* disable WAKEEN interrupt ASAP to prevent interrupt flood */
329         sdw_intel_shim_wake(sdw, false);
330
331         /*
332          * resume the Master, which will generate a bus reset and result in
333          * Slaves re-attaching and be re-enumerated. The SoundWire physical
334          * device which generated the wake will trigger an interrupt, which
335          * will in turn cause the corresponding Linux Slave device to be
336          * resumed and the Slave codec driver to check the status.
337          */
338         pm_request_resume(dev);
339
340         return 0;
341 }
342
343 /*
344  * PM calls
345  */
346
347 static int intel_resume_child_device(struct device *dev, void *data)
348 {
349         int ret;
350         struct sdw_slave *slave = dev_to_sdw_dev(dev);
351
352         if (!slave->probed) {
353                 dev_dbg(dev, "skipping device, no probed driver\n");
354                 return 0;
355         }
356         if (!slave->dev_num_sticky) {
357                 dev_dbg(dev, "skipping device, never detected on bus\n");
358                 return 0;
359         }
360
361         ret = pm_request_resume(dev);
362         if (ret < 0)
363                 dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
364
365         return ret;
366 }
367
368 static int __maybe_unused intel_pm_prepare(struct device *dev)
369 {
370         struct sdw_cdns *cdns = dev_get_drvdata(dev);
371         struct sdw_intel *sdw = cdns_to_intel(cdns);
372         struct sdw_bus *bus = &cdns->bus;
373         u32 clock_stop_quirks;
374         int ret;
375
376         if (bus->prop.hw_disabled || !sdw->startup_done) {
377                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
378                         bus->link_id);
379                 return 0;
380         }
381
382         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
383
384         if (pm_runtime_suspended(dev) &&
385             pm_runtime_suspended(dev->parent) &&
386             ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
387              !clock_stop_quirks)) {
388                 /*
389                  * if we've enabled clock stop, and the parent is suspended, the SHIM registers
390                  * are not accessible and the shim wake cannot be disabled.
391                  * The only solution is to resume the entire bus to full power
392                  */
393
394                 /*
395                  * If any operation in this block fails, we keep going since we don't want
396                  * to prevent system suspend from happening and errors should be recoverable
397                  * on resume.
398                  */
399
400                 /*
401                  * first resume the device for this link. This will also by construction
402                  * resume the PCI parent device.
403                  */
404                 ret = pm_request_resume(dev);
405                 if (ret < 0) {
406                         dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
407                         return 0;
408                 }
409
410                 /*
411                  * Continue resuming the entire bus (parent + child devices) to exit
412                  * the clock stop mode. If there are no devices connected on this link
413                  * this is a no-op.
414                  * The resume to full power could have been implemented with a .prepare
415                  * step in SoundWire codec drivers. This would however require a lot
416                  * of code to handle an Intel-specific corner case. It is simpler in
417                  * practice to add a loop at the link level.
418                  */
419                 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
420
421                 if (ret < 0)
422                         dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);
423         }
424
425         return 0;
426 }
427
428 static int __maybe_unused intel_suspend(struct device *dev)
429 {
430         struct sdw_cdns *cdns = dev_get_drvdata(dev);
431         struct sdw_intel *sdw = cdns_to_intel(cdns);
432         struct sdw_bus *bus = &cdns->bus;
433         u32 clock_stop_quirks;
434         int ret;
435
436         if (bus->prop.hw_disabled || !sdw->startup_done) {
437                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
438                         bus->link_id);
439                 return 0;
440         }
441
442         if (pm_runtime_suspended(dev)) {
443                 dev_dbg(dev, "pm_runtime status: suspended\n");
444
445                 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
446
447                 if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
448                     !clock_stop_quirks) {
449
450                         if (pm_runtime_suspended(dev->parent)) {
451                                 /*
452                                  * paranoia check: this should not happen with the .prepare
453                                  * resume to full power
454                                  */
455                                 dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);
456                         } else {
457                                 sdw_intel_shim_wake(sdw, false);
458                         }
459                 }
460
461                 return 0;
462         }
463
464         ret = sdw_intel_stop_bus(sdw, false);
465         if (ret < 0) {
466                 dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret);
467                 return ret;
468         }
469
470         return 0;
471 }
472
473 static int __maybe_unused intel_suspend_runtime(struct device *dev)
474 {
475         struct sdw_cdns *cdns = dev_get_drvdata(dev);
476         struct sdw_intel *sdw = cdns_to_intel(cdns);
477         struct sdw_bus *bus = &cdns->bus;
478         u32 clock_stop_quirks;
479         int ret;
480
481         if (bus->prop.hw_disabled || !sdw->startup_done) {
482                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
483                         bus->link_id);
484                 return 0;
485         }
486
487         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
488
489         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
490                 ret = sdw_intel_stop_bus(sdw, false);
491                 if (ret < 0) {
492                         dev_err(dev, "%s: cannot stop bus during teardown: %d\n",
493                                 __func__, ret);
494                         return ret;
495                 }
496         } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) {
497                 ret = sdw_intel_stop_bus(sdw, true);
498                 if (ret < 0) {
499                         dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n",
500                                 __func__, ret);
501                         return ret;
502                 }
503         } else {
504                 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
505                         __func__, clock_stop_quirks);
506                 ret = -EINVAL;
507         }
508
509         return ret;
510 }
511
512 static int __maybe_unused intel_resume(struct device *dev)
513 {
514         struct sdw_cdns *cdns = dev_get_drvdata(dev);
515         struct sdw_intel *sdw = cdns_to_intel(cdns);
516         struct sdw_bus *bus = &cdns->bus;
517         int link_flags;
518         int ret;
519
520         if (bus->prop.hw_disabled || !sdw->startup_done) {
521                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
522                         bus->link_id);
523                 return 0;
524         }
525
526         link_flags = md_flags >> (bus->link_id * 8);
527
528         if (pm_runtime_suspended(dev)) {
529                 dev_dbg(dev, "pm_runtime status was suspended, forcing active\n");
530
531                 /* follow required sequence from runtime_pm.rst */
532                 pm_runtime_disable(dev);
533                 pm_runtime_set_active(dev);
534                 pm_runtime_mark_last_busy(dev);
535                 pm_runtime_enable(dev);
536
537                 link_flags = md_flags >> (bus->link_id * 8);
538
539                 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
540                         pm_runtime_idle(dev);
541         }
542
543         ret = sdw_intel_link_power_up(sdw);
544         if (ret) {
545                 dev_err(dev, "%s failed: %d\n", __func__, ret);
546                 return ret;
547         }
548
549         /*
550          * make sure all Slaves are tagged as UNATTACHED and provide
551          * reason for reinitialization
552          */
553         sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
554
555         ret = sdw_intel_start_bus(sdw);
556         if (ret < 0) {
557                 dev_err(dev, "cannot start bus during resume\n");
558                 sdw_intel_link_power_down(sdw);
559                 return ret;
560         }
561
562         /*
563          * after system resume, the pm_runtime suspend() may kick in
564          * during the enumeration, before any children device force the
565          * master device to remain active.  Using pm_runtime_get()
566          * routines is not really possible, since it'd prevent the
567          * master from suspending.
568          * A reasonable compromise is to update the pm_runtime
569          * counters and delay the pm_runtime suspend by several
570          * seconds, by when all enumeration should be complete.
571          */
572         pm_runtime_mark_last_busy(dev);
573
574         return 0;
575 }
576
577 static int __maybe_unused intel_resume_runtime(struct device *dev)
578 {
579         struct sdw_cdns *cdns = dev_get_drvdata(dev);
580         struct sdw_intel *sdw = cdns_to_intel(cdns);
581         struct sdw_bus *bus = &cdns->bus;
582         u32 clock_stop_quirks;
583         int ret;
584
585         if (bus->prop.hw_disabled || !sdw->startup_done) {
586                 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
587                         bus->link_id);
588                 return 0;
589         }
590
591         /* unconditionally disable WAKEEN interrupt */
592         sdw_intel_shim_wake(sdw, false);
593
594         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
595
596         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
597                 ret = sdw_intel_link_power_up(sdw);
598                 if (ret) {
599                         dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret);
600                         return ret;
601                 }
602
603                 /*
604                  * make sure all Slaves are tagged as UNATTACHED and provide
605                  * reason for reinitialization
606                  */
607                 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
608
609                 ret = sdw_intel_start_bus(sdw);
610                 if (ret < 0) {
611                         dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret);
612                         sdw_intel_link_power_down(sdw);
613                         return ret;
614                 }
615
616         } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
617                 ret = sdw_intel_link_power_up(sdw);
618                 if (ret) {
619                         dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret);
620                         return ret;
621                 }
622
623                 ret = sdw_intel_start_bus_after_reset(sdw);
624                 if (ret < 0) {
625                         dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret);
626                         sdw_intel_link_power_down(sdw);
627                         return ret;
628                 }
629         } else if (!clock_stop_quirks) {
630
631                 sdw_intel_check_clock_stop(sdw);
632
633                 ret = sdw_intel_link_power_up(sdw);
634                 if (ret) {
635                         dev_err(dev, "%s: power_up failed: %d\n", __func__, ret);
636                         return ret;
637                 }
638
639                 ret = sdw_intel_start_bus_after_clock_stop(sdw);
640                 if (ret < 0) {
641                         dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret);
642                         sdw_intel_link_power_down(sdw);
643                         return ret;
644                 }
645         } else {
646                 dev_err(dev, "%s: clock_stop_quirks %x unsupported\n",
647                         __func__, clock_stop_quirks);
648                 ret = -EINVAL;
649         }
650
651         return ret;
652 }
653
654 static const struct dev_pm_ops intel_pm = {
655         .prepare = intel_pm_prepare,
656         SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
657         SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)
658 };
659
660 static const struct auxiliary_device_id intel_link_id_table[] = {
661         { .name = "soundwire_intel.link" },
662         {},
663 };
664 MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table);
665
666 static struct auxiliary_driver sdw_intel_drv = {
667         .probe = intel_link_probe,
668         .remove = intel_link_remove,
669         .driver = {
670                 /* auxiliary_driver_register() sets .name to be the modname */
671                 .pm = &intel_pm,
672         },
673         .id_table = intel_link_id_table
674 };
675 module_auxiliary_driver(sdw_intel_drv);
676
677 MODULE_LICENSE("Dual BSD/GPL");
678 MODULE_DESCRIPTION("Intel Soundwire Link Driver");