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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org>
4 *
5 * Based on drivers/spmi/spmi.c:
6 * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
7 */
8
9#include <linux/acpi.h>
10#include <linux/errno.h>
11#include <linux/idr.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/of_device.h>
16#include <linux/pm_domain.h>
17#include <linux/pm_runtime.h>
18#include <linux/sched.h>
19#include <linux/serdev.h>
20#include <linux/slab.h>
21
22static bool is_registered;
23static DEFINE_IDA(ctrl_ida);
24
25static ssize_t modalias_show(struct device *dev,
26 struct device_attribute *attr, char *buf)
27{
28 int len;
29
30 len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
31 if (len != -ENODEV)
32 return len;
33
34 return of_device_modalias(dev, buf, PAGE_SIZE);
35}
36static DEVICE_ATTR_RO(modalias);
37
38static struct attribute *serdev_device_attrs[] = {
39 &dev_attr_modalias.attr,
40 NULL,
41};
42ATTRIBUTE_GROUPS(serdev_device);
43
44static int serdev_device_uevent(struct device *dev, struct kobj_uevent_env *env)
45{
46 int rc;
47
48 /* TODO: platform modalias */
49
50 rc = acpi_device_uevent_modalias(dev, env);
51 if (rc != -ENODEV)
52 return rc;
53
54 return of_device_uevent_modalias(dev, env);
55}
56
57static void serdev_device_release(struct device *dev)
58{
59 struct serdev_device *serdev = to_serdev_device(dev);
60 kfree(serdev);
61}
62
63static const struct device_type serdev_device_type = {
64 .groups = serdev_device_groups,
65 .uevent = serdev_device_uevent,
66 .release = serdev_device_release,
67};
68
69static bool is_serdev_device(const struct device *dev)
70{
71 return dev->type == &serdev_device_type;
72}
73
74static void serdev_ctrl_release(struct device *dev)
75{
76 struct serdev_controller *ctrl = to_serdev_controller(dev);
77 ida_simple_remove(&ctrl_ida, ctrl->nr);
78 kfree(ctrl);
79}
80
81static const struct device_type serdev_ctrl_type = {
82 .release = serdev_ctrl_release,
83};
84
85static int serdev_device_match(struct device *dev, struct device_driver *drv)
86{
87 if (!is_serdev_device(dev))
88 return 0;
89
90 /* TODO: platform matching */
91 if (acpi_driver_match_device(dev, drv))
92 return 1;
93
94 return of_driver_match_device(dev, drv);
95}
96
97/**
98 * serdev_device_add() - add a device previously constructed via serdev_device_alloc()
99 * @serdev: serdev_device to be added
100 */
101int serdev_device_add(struct serdev_device *serdev)
102{
103 struct serdev_controller *ctrl = serdev->ctrl;
104 struct device *parent = serdev->dev.parent;
105 int err;
106
107 dev_set_name(&serdev->dev, "%s-%d", dev_name(parent), serdev->nr);
108
109 /* Only a single slave device is currently supported. */
110 if (ctrl->serdev) {
111 dev_err(&serdev->dev, "controller busy\n");
112 return -EBUSY;
113 }
114 ctrl->serdev = serdev;
115
116 err = device_add(&serdev->dev);
117 if (err < 0) {
118 dev_err(&serdev->dev, "Can't add %s, status %d\n",
119 dev_name(&serdev->dev), err);
120 goto err_clear_serdev;
121 }
122
123 dev_dbg(&serdev->dev, "device %s registered\n", dev_name(&serdev->dev));
124
125 return 0;
126
127err_clear_serdev:
128 ctrl->serdev = NULL;
129 return err;
130}
131EXPORT_SYMBOL_GPL(serdev_device_add);
132
133/**
134 * serdev_device_remove(): remove an serdev device
135 * @serdev: serdev_device to be removed
136 */
137void serdev_device_remove(struct serdev_device *serdev)
138{
139 struct serdev_controller *ctrl = serdev->ctrl;
140
141 device_unregister(&serdev->dev);
142 ctrl->serdev = NULL;
143}
144EXPORT_SYMBOL_GPL(serdev_device_remove);
145
146int serdev_device_open(struct serdev_device *serdev)
147{
148 struct serdev_controller *ctrl = serdev->ctrl;
149 int ret;
150
151 if (!ctrl || !ctrl->ops->open)
152 return -EINVAL;
153
154 ret = ctrl->ops->open(ctrl);
155 if (ret)
156 return ret;
157
158 ret = pm_runtime_get_sync(&ctrl->dev);
159 if (ret < 0) {
160 pm_runtime_put_noidle(&ctrl->dev);
161 goto err_close;
162 }
163
164 return 0;
165
166err_close:
167 if (ctrl->ops->close)
168 ctrl->ops->close(ctrl);
169
170 return ret;
171}
172EXPORT_SYMBOL_GPL(serdev_device_open);
173
174void serdev_device_close(struct serdev_device *serdev)
175{
176 struct serdev_controller *ctrl = serdev->ctrl;
177
178 if (!ctrl || !ctrl->ops->close)
179 return;
180
181 pm_runtime_put(&ctrl->dev);
182
183 ctrl->ops->close(ctrl);
184}
185EXPORT_SYMBOL_GPL(serdev_device_close);
186
187static void devm_serdev_device_release(struct device *dev, void *dr)
188{
189 serdev_device_close(*(struct serdev_device **)dr);
190}
191
192int devm_serdev_device_open(struct device *dev, struct serdev_device *serdev)
193{
194 struct serdev_device **dr;
195 int ret;
196
197 dr = devres_alloc(devm_serdev_device_release, sizeof(*dr), GFP_KERNEL);
198 if (!dr)
199 return -ENOMEM;
200
201 ret = serdev_device_open(serdev);
202 if (ret) {
203 devres_free(dr);
204 return ret;
205 }
206
207 *dr = serdev;
208 devres_add(dev, dr);
209
210 return 0;
211}
212EXPORT_SYMBOL_GPL(devm_serdev_device_open);
213
214void serdev_device_write_wakeup(struct serdev_device *serdev)
215{
216 complete(&serdev->write_comp);
217}
218EXPORT_SYMBOL_GPL(serdev_device_write_wakeup);
219
220/**
221 * serdev_device_write_buf() - write data asynchronously
222 * @serdev: serdev device
223 * @buf: data to be written
224 * @count: number of bytes to write
225 *
226 * Write data to the device asynchronously.
227 *
228 * Note that any accepted data has only been buffered by the controller; use
229 * serdev_device_wait_until_sent() to make sure the controller write buffer
230 * has actually been emptied.
231 *
232 * Return: The number of bytes written (less than count if not enough room in
233 * the write buffer), or a negative errno on errors.
234 */
235int serdev_device_write_buf(struct serdev_device *serdev,
236 const unsigned char *buf, size_t count)
237{
238 struct serdev_controller *ctrl = serdev->ctrl;
239
240 if (!ctrl || !ctrl->ops->write_buf)
241 return -EINVAL;
242
243 return ctrl->ops->write_buf(ctrl, buf, count);
244}
245EXPORT_SYMBOL_GPL(serdev_device_write_buf);
246
247/**
248 * serdev_device_write() - write data synchronously
249 * @serdev: serdev device
250 * @buf: data to be written
251 * @count: number of bytes to write
252 * @timeout: timeout in jiffies, or 0 to wait indefinitely
253 *
254 * Write data to the device synchronously by repeatedly calling
255 * serdev_device_write() until the controller has accepted all data (unless
256 * interrupted by a timeout or a signal).
257 *
258 * Note that any accepted data has only been buffered by the controller; use
259 * serdev_device_wait_until_sent() to make sure the controller write buffer
260 * has actually been emptied.
261 *
262 * Note that this function depends on serdev_device_write_wakeup() being
263 * called in the serdev driver write_wakeup() callback.
264 *
265 * Return: The number of bytes written (less than count if interrupted),
266 * -ETIMEDOUT or -ERESTARTSYS if interrupted before any bytes were written, or
267 * a negative errno on errors.
268 */
269int serdev_device_write(struct serdev_device *serdev,
270 const unsigned char *buf, size_t count,
271 long timeout)
272{
273 struct serdev_controller *ctrl = serdev->ctrl;
274 int written = 0;
275 int ret;
276
277 if (!ctrl || !ctrl->ops->write_buf || !serdev->ops->write_wakeup)
278 return -EINVAL;
279
280 if (timeout == 0)
281 timeout = MAX_SCHEDULE_TIMEOUT;
282
283 mutex_lock(&serdev->write_lock);
284 do {
285 reinit_completion(&serdev->write_comp);
286
287 ret = ctrl->ops->write_buf(ctrl, buf, count);
288 if (ret < 0)
289 break;
290
291 written += ret;
292 buf += ret;
293 count -= ret;
294
295 if (count == 0)
296 break;
297
298 timeout = wait_for_completion_interruptible_timeout(&serdev->write_comp,
299 timeout);
300 } while (timeout > 0);
301 mutex_unlock(&serdev->write_lock);
302
303 if (ret < 0)
304 return ret;
305
306 if (timeout <= 0 && written == 0) {
307 if (timeout == -ERESTARTSYS)
308 return -ERESTARTSYS;
309 else
310 return -ETIMEDOUT;
311 }
312
313 return written;
314}
315EXPORT_SYMBOL_GPL(serdev_device_write);
316
317void serdev_device_write_flush(struct serdev_device *serdev)
318{
319 struct serdev_controller *ctrl = serdev->ctrl;
320
321 if (!ctrl || !ctrl->ops->write_flush)
322 return;
323
324 ctrl->ops->write_flush(ctrl);
325}
326EXPORT_SYMBOL_GPL(serdev_device_write_flush);
327
328int serdev_device_write_room(struct serdev_device *serdev)
329{
330 struct serdev_controller *ctrl = serdev->ctrl;
331
332 if (!ctrl || !ctrl->ops->write_room)
333 return 0;
334
335 return serdev->ctrl->ops->write_room(ctrl);
336}
337EXPORT_SYMBOL_GPL(serdev_device_write_room);
338
339unsigned int serdev_device_set_baudrate(struct serdev_device *serdev, unsigned int speed)
340{
341 struct serdev_controller *ctrl = serdev->ctrl;
342
343 if (!ctrl || !ctrl->ops->set_baudrate)
344 return 0;
345
346 return ctrl->ops->set_baudrate(ctrl, speed);
347
348}
349EXPORT_SYMBOL_GPL(serdev_device_set_baudrate);
350
351void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable)
352{
353 struct serdev_controller *ctrl = serdev->ctrl;
354
355 if (!ctrl || !ctrl->ops->set_flow_control)
356 return;
357
358 ctrl->ops->set_flow_control(ctrl, enable);
359}
360EXPORT_SYMBOL_GPL(serdev_device_set_flow_control);
361
362int serdev_device_set_parity(struct serdev_device *serdev,
363 enum serdev_parity parity)
364{
365 struct serdev_controller *ctrl = serdev->ctrl;
366
367 if (!ctrl || !ctrl->ops->set_parity)
368 return -ENOTSUPP;
369
370 return ctrl->ops->set_parity(ctrl, parity);
371}
372EXPORT_SYMBOL_GPL(serdev_device_set_parity);
373
374void serdev_device_wait_until_sent(struct serdev_device *serdev, long timeout)
375{
376 struct serdev_controller *ctrl = serdev->ctrl;
377
378 if (!ctrl || !ctrl->ops->wait_until_sent)
379 return;
380
381 ctrl->ops->wait_until_sent(ctrl, timeout);
382}
383EXPORT_SYMBOL_GPL(serdev_device_wait_until_sent);
384
385int serdev_device_get_tiocm(struct serdev_device *serdev)
386{
387 struct serdev_controller *ctrl = serdev->ctrl;
388
389 if (!ctrl || !ctrl->ops->get_tiocm)
390 return -ENOTSUPP;
391
392 return ctrl->ops->get_tiocm(ctrl);
393}
394EXPORT_SYMBOL_GPL(serdev_device_get_tiocm);
395
396int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear)
397{
398 struct serdev_controller *ctrl = serdev->ctrl;
399
400 if (!ctrl || !ctrl->ops->set_tiocm)
401 return -ENOTSUPP;
402
403 return ctrl->ops->set_tiocm(ctrl, set, clear);
404}
405EXPORT_SYMBOL_GPL(serdev_device_set_tiocm);
406
407static int serdev_drv_probe(struct device *dev)
408{
409 const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
410 int ret;
411
412 ret = dev_pm_domain_attach(dev, true);
413 if (ret)
414 return ret;
415
416 ret = sdrv->probe(to_serdev_device(dev));
417 if (ret)
418 dev_pm_domain_detach(dev, true);
419
420 return ret;
421}
422
423static int serdev_drv_remove(struct device *dev)
424{
425 const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
426 if (sdrv->remove)
427 sdrv->remove(to_serdev_device(dev));
428
429 dev_pm_domain_detach(dev, true);
430
431 return 0;
432}
433
434static struct bus_type serdev_bus_type = {
435 .name = "serial",
436 .match = serdev_device_match,
437 .probe = serdev_drv_probe,
438 .remove = serdev_drv_remove,
439};
440
441/**
442 * serdev_device_alloc() - Allocate a new serdev device
443 * @ctrl: associated controller
444 *
445 * Caller is responsible for either calling serdev_device_add() to add the
446 * newly allocated controller, or calling serdev_device_put() to discard it.
447 */
448struct serdev_device *serdev_device_alloc(struct serdev_controller *ctrl)
449{
450 struct serdev_device *serdev;
451
452 serdev = kzalloc(sizeof(*serdev), GFP_KERNEL);
453 if (!serdev)
454 return NULL;
455
456 serdev->ctrl = ctrl;
457 device_initialize(&serdev->dev);
458 serdev->dev.parent = &ctrl->dev;
459 serdev->dev.bus = &serdev_bus_type;
460 serdev->dev.type = &serdev_device_type;
461 init_completion(&serdev->write_comp);
462 mutex_init(&serdev->write_lock);
463 return serdev;
464}
465EXPORT_SYMBOL_GPL(serdev_device_alloc);
466
467/**
468 * serdev_controller_alloc() - Allocate a new serdev controller
469 * @parent: parent device
470 * @size: size of private data
471 *
472 * Caller is responsible for either calling serdev_controller_add() to add the
473 * newly allocated controller, or calling serdev_controller_put() to discard it.
474 * The allocated private data region may be accessed via
475 * serdev_controller_get_drvdata()
476 */
477struct serdev_controller *serdev_controller_alloc(struct device *parent,
478 size_t size)
479{
480 struct serdev_controller *ctrl;
481 int id;
482
483 if (WARN_ON(!parent))
484 return NULL;
485
486 ctrl = kzalloc(sizeof(*ctrl) + size, GFP_KERNEL);
487 if (!ctrl)
488 return NULL;
489
490 id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
491 if (id < 0) {
492 dev_err(parent,
493 "unable to allocate serdev controller identifier.\n");
494 goto err_free;
495 }
496
497 ctrl->nr = id;
498
499 device_initialize(&ctrl->dev);
500 ctrl->dev.type = &serdev_ctrl_type;
501 ctrl->dev.bus = &serdev_bus_type;
502 ctrl->dev.parent = parent;
503 ctrl->dev.of_node = parent->of_node;
504 serdev_controller_set_drvdata(ctrl, &ctrl[1]);
505
506 dev_set_name(&ctrl->dev, "serial%d", id);
507
508 pm_runtime_no_callbacks(&ctrl->dev);
509 pm_suspend_ignore_children(&ctrl->dev, true);
510
511 dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id);
512 return ctrl;
513
514err_free:
515 kfree(ctrl);
516
517 return NULL;
518}
519EXPORT_SYMBOL_GPL(serdev_controller_alloc);
520
521static int of_serdev_register_devices(struct serdev_controller *ctrl)
522{
523 struct device_node *node;
524 struct serdev_device *serdev = NULL;
525 int err;
526 bool found = false;
527
528 for_each_available_child_of_node(ctrl->dev.of_node, node) {
529 if (!of_get_property(node, "compatible", NULL))
530 continue;
531
532 dev_dbg(&ctrl->dev, "adding child %pOF\n", node);
533
534 serdev = serdev_device_alloc(ctrl);
535 if (!serdev)
536 continue;
537
538 serdev->dev.of_node = node;
539
540 err = serdev_device_add(serdev);
541 if (err) {
542 dev_err(&serdev->dev,
543 "failure adding device. status %d\n", err);
544 serdev_device_put(serdev);
545 } else
546 found = true;
547 }
548 if (!found)
549 return -ENODEV;
550
551 return 0;
552}
553
554#ifdef CONFIG_ACPI
555static acpi_status acpi_serdev_register_device(struct serdev_controller *ctrl,
556 struct acpi_device *adev)
557{
558 struct serdev_device *serdev = NULL;
559 int err;
560
561 if (acpi_bus_get_status(adev) || !adev->status.present ||
562 acpi_device_enumerated(adev))
563 return AE_OK;
564
565 serdev = serdev_device_alloc(ctrl);
566 if (!serdev) {
567 dev_err(&ctrl->dev, "failed to allocate serdev device for %s\n",
568 dev_name(&adev->dev));
569 return AE_NO_MEMORY;
570 }
571
572 ACPI_COMPANION_SET(&serdev->dev, adev);
573 acpi_device_set_enumerated(adev);
574
575 err = serdev_device_add(serdev);
576 if (err) {
577 dev_err(&serdev->dev,
578 "failure adding ACPI serdev device. status %d\n", err);
579 serdev_device_put(serdev);
580 }
581
582 return AE_OK;
583}
584
585static acpi_status acpi_serdev_add_device(acpi_handle handle, u32 level,
586 void *data, void **return_value)
587{
588 struct serdev_controller *ctrl = data;
589 struct acpi_device *adev;
590
591 if (acpi_bus_get_device(handle, &adev))
592 return AE_OK;
593
594 return acpi_serdev_register_device(ctrl, adev);
595}
596
597static int acpi_serdev_register_devices(struct serdev_controller *ctrl)
598{
599 acpi_status status;
600 acpi_handle handle;
601
602 handle = ACPI_HANDLE(ctrl->dev.parent);
603 if (!handle)
604 return -ENODEV;
605
606 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
607 acpi_serdev_add_device, NULL, ctrl, NULL);
608 if (ACPI_FAILURE(status))
609 dev_dbg(&ctrl->dev, "failed to enumerate serdev slaves\n");
610
611 if (!ctrl->serdev)
612 return -ENODEV;
613
614 return 0;
615}
616#else
617static inline int acpi_serdev_register_devices(struct serdev_controller *ctrl)
618{
619 return -ENODEV;
620}
621#endif /* CONFIG_ACPI */
622
623/**
624 * serdev_controller_add() - Add an serdev controller
625 * @ctrl: controller to be registered.
626 *
627 * Register a controller previously allocated via serdev_controller_alloc() with
628 * the serdev core.
629 */
630int serdev_controller_add(struct serdev_controller *ctrl)
631{
632 int ret_of, ret_acpi, ret;
633
634 /* Can't register until after driver model init */
635 if (WARN_ON(!is_registered))
636 return -EAGAIN;
637
638 ret = device_add(&ctrl->dev);
639 if (ret)
640 return ret;
641
642 pm_runtime_enable(&ctrl->dev);
643
644 ret_of = of_serdev_register_devices(ctrl);
645 ret_acpi = acpi_serdev_register_devices(ctrl);
646 if (ret_of && ret_acpi) {
647 dev_dbg(&ctrl->dev, "no devices registered: of:%d acpi:%d\n",
648 ret_of, ret_acpi);
649 ret = -ENODEV;
650 goto err_rpm_disable;
651 }
652
653 dev_dbg(&ctrl->dev, "serdev%d registered: dev:%p\n",
654 ctrl->nr, &ctrl->dev);
655 return 0;
656
657err_rpm_disable:
658 pm_runtime_disable(&ctrl->dev);
659 device_del(&ctrl->dev);
660 return ret;
661};
662EXPORT_SYMBOL_GPL(serdev_controller_add);
663
664/* Remove a device associated with a controller */
665static int serdev_remove_device(struct device *dev, void *data)
666{
667 struct serdev_device *serdev = to_serdev_device(dev);
668 if (dev->type == &serdev_device_type)
669 serdev_device_remove(serdev);
670 return 0;
671}
672
673/**
674 * serdev_controller_remove(): remove an serdev controller
675 * @ctrl: controller to remove
676 *
677 * Remove a serdev controller. Caller is responsible for calling
678 * serdev_controller_put() to discard the allocated controller.
679 */
680void serdev_controller_remove(struct serdev_controller *ctrl)
681{
682 int dummy;
683
684 if (!ctrl)
685 return;
686
687 dummy = device_for_each_child(&ctrl->dev, NULL,
688 serdev_remove_device);
689 pm_runtime_disable(&ctrl->dev);
690 device_del(&ctrl->dev);
691}
692EXPORT_SYMBOL_GPL(serdev_controller_remove);
693
694/**
695 * serdev_driver_register() - Register client driver with serdev core
696 * @sdrv: client driver to be associated with client-device.
697 *
698 * This API will register the client driver with the serdev framework.
699 * It is typically called from the driver's module-init function.
700 */
701int __serdev_device_driver_register(struct serdev_device_driver *sdrv, struct module *owner)
702{
703 sdrv->driver.bus = &serdev_bus_type;
704 sdrv->driver.owner = owner;
705
706 /* force drivers to async probe so I/O is possible in probe */
707 sdrv->driver.probe_type = PROBE_PREFER_ASYNCHRONOUS;
708
709 return driver_register(&sdrv->driver);
710}
711EXPORT_SYMBOL_GPL(__serdev_device_driver_register);
712
713static void __exit serdev_exit(void)
714{
715 bus_unregister(&serdev_bus_type);
716 ida_destroy(&ctrl_ida);
717}
718module_exit(serdev_exit);
719
720static int __init serdev_init(void)
721{
722 int ret;
723
724 ret = bus_register(&serdev_bus_type);
725 if (ret)
726 return ret;
727
728 is_registered = true;
729 return 0;
730}
731/* Must be before serial drivers register */
732postcore_initcall(serdev_init);
733
734MODULE_AUTHOR("Rob Herring <robh@kernel.org>");
735MODULE_LICENSE("GPL v2");
736MODULE_DESCRIPTION("Serial attached device bus");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org>
4 *
5 * Based on drivers/spmi/spmi.c:
6 * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
7 */
8
9#include <linux/acpi.h>
10#include <linux/errno.h>
11#include <linux/idr.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/of_device.h>
16#include <linux/pm_domain.h>
17#include <linux/pm_runtime.h>
18#include <linux/property.h>
19#include <linux/sched.h>
20#include <linux/serdev.h>
21#include <linux/slab.h>
22
23#include <linux/platform_data/x86/apple.h>
24
25static bool is_registered;
26static DEFINE_IDA(ctrl_ida);
27
28static ssize_t modalias_show(struct device *dev,
29 struct device_attribute *attr, char *buf)
30{
31 int len;
32
33 len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
34 if (len != -ENODEV)
35 return len;
36
37 return of_device_modalias(dev, buf, PAGE_SIZE);
38}
39static DEVICE_ATTR_RO(modalias);
40
41static struct attribute *serdev_device_attrs[] = {
42 &dev_attr_modalias.attr,
43 NULL,
44};
45ATTRIBUTE_GROUPS(serdev_device);
46
47static int serdev_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
48{
49 int rc;
50
51 /* TODO: platform modalias */
52
53 rc = acpi_device_uevent_modalias(dev, env);
54 if (rc != -ENODEV)
55 return rc;
56
57 return of_device_uevent_modalias(dev, env);
58}
59
60static void serdev_device_release(struct device *dev)
61{
62 struct serdev_device *serdev = to_serdev_device(dev);
63 kfree(serdev);
64}
65
66static const struct device_type serdev_device_type = {
67 .groups = serdev_device_groups,
68 .uevent = serdev_device_uevent,
69 .release = serdev_device_release,
70};
71
72static bool is_serdev_device(const struct device *dev)
73{
74 return dev->type == &serdev_device_type;
75}
76
77static void serdev_ctrl_release(struct device *dev)
78{
79 struct serdev_controller *ctrl = to_serdev_controller(dev);
80 ida_free(&ctrl_ida, ctrl->nr);
81 kfree(ctrl);
82}
83
84static const struct device_type serdev_ctrl_type = {
85 .release = serdev_ctrl_release,
86};
87
88static int serdev_device_match(struct device *dev, const struct device_driver *drv)
89{
90 if (!is_serdev_device(dev))
91 return 0;
92
93 /* TODO: platform matching */
94 if (acpi_driver_match_device(dev, drv))
95 return 1;
96
97 return of_driver_match_device(dev, drv);
98}
99
100/**
101 * serdev_device_add() - add a device previously constructed via serdev_device_alloc()
102 * @serdev: serdev_device to be added
103 */
104int serdev_device_add(struct serdev_device *serdev)
105{
106 struct serdev_controller *ctrl = serdev->ctrl;
107 struct device *parent = serdev->dev.parent;
108 int err;
109
110 dev_set_name(&serdev->dev, "%s-%d", dev_name(parent), serdev->nr);
111
112 /* Only a single slave device is currently supported. */
113 if (ctrl->serdev) {
114 dev_err(&serdev->dev, "controller busy\n");
115 return -EBUSY;
116 }
117 ctrl->serdev = serdev;
118
119 err = device_add(&serdev->dev);
120 if (err < 0) {
121 dev_err(&serdev->dev, "Can't add %s, status %pe\n",
122 dev_name(&serdev->dev), ERR_PTR(err));
123 goto err_clear_serdev;
124 }
125
126 dev_dbg(&serdev->dev, "device %s registered\n", dev_name(&serdev->dev));
127
128 return 0;
129
130err_clear_serdev:
131 ctrl->serdev = NULL;
132 return err;
133}
134EXPORT_SYMBOL_GPL(serdev_device_add);
135
136/**
137 * serdev_device_remove(): remove an serdev device
138 * @serdev: serdev_device to be removed
139 */
140void serdev_device_remove(struct serdev_device *serdev)
141{
142 struct serdev_controller *ctrl = serdev->ctrl;
143
144 device_unregister(&serdev->dev);
145 ctrl->serdev = NULL;
146}
147EXPORT_SYMBOL_GPL(serdev_device_remove);
148
149int serdev_device_open(struct serdev_device *serdev)
150{
151 struct serdev_controller *ctrl = serdev->ctrl;
152 int ret;
153
154 if (!ctrl || !ctrl->ops->open)
155 return -EINVAL;
156
157 ret = ctrl->ops->open(ctrl);
158 if (ret)
159 return ret;
160
161 ret = pm_runtime_get_sync(&ctrl->dev);
162 if (ret < 0) {
163 pm_runtime_put_noidle(&ctrl->dev);
164 goto err_close;
165 }
166
167 return 0;
168
169err_close:
170 if (ctrl->ops->close)
171 ctrl->ops->close(ctrl);
172
173 return ret;
174}
175EXPORT_SYMBOL_GPL(serdev_device_open);
176
177void serdev_device_close(struct serdev_device *serdev)
178{
179 struct serdev_controller *ctrl = serdev->ctrl;
180
181 if (!ctrl || !ctrl->ops->close)
182 return;
183
184 pm_runtime_put(&ctrl->dev);
185
186 ctrl->ops->close(ctrl);
187}
188EXPORT_SYMBOL_GPL(serdev_device_close);
189
190static void devm_serdev_device_close(void *serdev)
191{
192 serdev_device_close(serdev);
193}
194
195int devm_serdev_device_open(struct device *dev, struct serdev_device *serdev)
196{
197 int ret;
198
199 ret = serdev_device_open(serdev);
200 if (ret)
201 return ret;
202
203 return devm_add_action_or_reset(dev, devm_serdev_device_close, serdev);
204}
205EXPORT_SYMBOL_GPL(devm_serdev_device_open);
206
207void serdev_device_write_wakeup(struct serdev_device *serdev)
208{
209 complete(&serdev->write_comp);
210}
211EXPORT_SYMBOL_GPL(serdev_device_write_wakeup);
212
213/**
214 * serdev_device_write_buf() - write data asynchronously
215 * @serdev: serdev device
216 * @buf: data to be written
217 * @count: number of bytes to write
218 *
219 * Write data to the device asynchronously.
220 *
221 * Note that any accepted data has only been buffered by the controller; use
222 * serdev_device_wait_until_sent() to make sure the controller write buffer
223 * has actually been emptied.
224 *
225 * Return: The number of bytes written (less than count if not enough room in
226 * the write buffer), or a negative errno on errors.
227 */
228int serdev_device_write_buf(struct serdev_device *serdev, const u8 *buf, size_t count)
229{
230 struct serdev_controller *ctrl = serdev->ctrl;
231
232 if (!ctrl || !ctrl->ops->write_buf)
233 return -EINVAL;
234
235 return ctrl->ops->write_buf(ctrl, buf, count);
236}
237EXPORT_SYMBOL_GPL(serdev_device_write_buf);
238
239/**
240 * serdev_device_write() - write data synchronously
241 * @serdev: serdev device
242 * @buf: data to be written
243 * @count: number of bytes to write
244 * @timeout: timeout in jiffies, or 0 to wait indefinitely
245 *
246 * Write data to the device synchronously by repeatedly calling
247 * serdev_device_write() until the controller has accepted all data (unless
248 * interrupted by a timeout or a signal).
249 *
250 * Note that any accepted data has only been buffered by the controller; use
251 * serdev_device_wait_until_sent() to make sure the controller write buffer
252 * has actually been emptied.
253 *
254 * Note that this function depends on serdev_device_write_wakeup() being
255 * called in the serdev driver write_wakeup() callback.
256 *
257 * Return: The number of bytes written (less than count if interrupted),
258 * -ETIMEDOUT or -ERESTARTSYS if interrupted before any bytes were written, or
259 * a negative errno on errors.
260 */
261ssize_t serdev_device_write(struct serdev_device *serdev, const u8 *buf,
262 size_t count, long timeout)
263{
264 struct serdev_controller *ctrl = serdev->ctrl;
265 size_t written = 0;
266 ssize_t ret;
267
268 if (!ctrl || !ctrl->ops->write_buf || !serdev->ops->write_wakeup)
269 return -EINVAL;
270
271 if (timeout == 0)
272 timeout = MAX_SCHEDULE_TIMEOUT;
273
274 mutex_lock(&serdev->write_lock);
275 do {
276 reinit_completion(&serdev->write_comp);
277
278 ret = ctrl->ops->write_buf(ctrl, buf, count);
279 if (ret < 0)
280 break;
281
282 written += ret;
283 buf += ret;
284 count -= ret;
285
286 if (count == 0)
287 break;
288
289 timeout = wait_for_completion_interruptible_timeout(&serdev->write_comp,
290 timeout);
291 } while (timeout > 0);
292 mutex_unlock(&serdev->write_lock);
293
294 if (ret < 0)
295 return ret;
296
297 if (timeout <= 0 && written == 0) {
298 if (timeout == -ERESTARTSYS)
299 return -ERESTARTSYS;
300 else
301 return -ETIMEDOUT;
302 }
303
304 return written;
305}
306EXPORT_SYMBOL_GPL(serdev_device_write);
307
308void serdev_device_write_flush(struct serdev_device *serdev)
309{
310 struct serdev_controller *ctrl = serdev->ctrl;
311
312 if (!ctrl || !ctrl->ops->write_flush)
313 return;
314
315 ctrl->ops->write_flush(ctrl);
316}
317EXPORT_SYMBOL_GPL(serdev_device_write_flush);
318
319int serdev_device_write_room(struct serdev_device *serdev)
320{
321 struct serdev_controller *ctrl = serdev->ctrl;
322
323 if (!ctrl || !ctrl->ops->write_room)
324 return 0;
325
326 return serdev->ctrl->ops->write_room(ctrl);
327}
328EXPORT_SYMBOL_GPL(serdev_device_write_room);
329
330unsigned int serdev_device_set_baudrate(struct serdev_device *serdev, unsigned int speed)
331{
332 struct serdev_controller *ctrl = serdev->ctrl;
333
334 if (!ctrl || !ctrl->ops->set_baudrate)
335 return 0;
336
337 return ctrl->ops->set_baudrate(ctrl, speed);
338
339}
340EXPORT_SYMBOL_GPL(serdev_device_set_baudrate);
341
342void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable)
343{
344 struct serdev_controller *ctrl = serdev->ctrl;
345
346 if (!ctrl || !ctrl->ops->set_flow_control)
347 return;
348
349 ctrl->ops->set_flow_control(ctrl, enable);
350}
351EXPORT_SYMBOL_GPL(serdev_device_set_flow_control);
352
353int serdev_device_set_parity(struct serdev_device *serdev,
354 enum serdev_parity parity)
355{
356 struct serdev_controller *ctrl = serdev->ctrl;
357
358 if (!ctrl || !ctrl->ops->set_parity)
359 return -EOPNOTSUPP;
360
361 return ctrl->ops->set_parity(ctrl, parity);
362}
363EXPORT_SYMBOL_GPL(serdev_device_set_parity);
364
365void serdev_device_wait_until_sent(struct serdev_device *serdev, long timeout)
366{
367 struct serdev_controller *ctrl = serdev->ctrl;
368
369 if (!ctrl || !ctrl->ops->wait_until_sent)
370 return;
371
372 ctrl->ops->wait_until_sent(ctrl, timeout);
373}
374EXPORT_SYMBOL_GPL(serdev_device_wait_until_sent);
375
376int serdev_device_get_tiocm(struct serdev_device *serdev)
377{
378 struct serdev_controller *ctrl = serdev->ctrl;
379
380 if (!ctrl || !ctrl->ops->get_tiocm)
381 return -EOPNOTSUPP;
382
383 return ctrl->ops->get_tiocm(ctrl);
384}
385EXPORT_SYMBOL_GPL(serdev_device_get_tiocm);
386
387int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear)
388{
389 struct serdev_controller *ctrl = serdev->ctrl;
390
391 if (!ctrl || !ctrl->ops->set_tiocm)
392 return -EOPNOTSUPP;
393
394 return ctrl->ops->set_tiocm(ctrl, set, clear);
395}
396EXPORT_SYMBOL_GPL(serdev_device_set_tiocm);
397
398int serdev_device_break_ctl(struct serdev_device *serdev, int break_state)
399{
400 struct serdev_controller *ctrl = serdev->ctrl;
401
402 if (!ctrl || !ctrl->ops->break_ctl)
403 return -EOPNOTSUPP;
404
405 return ctrl->ops->break_ctl(ctrl, break_state);
406}
407EXPORT_SYMBOL_GPL(serdev_device_break_ctl);
408
409static int serdev_drv_probe(struct device *dev)
410{
411 const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
412 int ret;
413
414 ret = dev_pm_domain_attach(dev, true);
415 if (ret)
416 return ret;
417
418 ret = sdrv->probe(to_serdev_device(dev));
419 if (ret)
420 dev_pm_domain_detach(dev, true);
421
422 return ret;
423}
424
425static void serdev_drv_remove(struct device *dev)
426{
427 const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
428 if (sdrv->remove)
429 sdrv->remove(to_serdev_device(dev));
430
431 dev_pm_domain_detach(dev, true);
432}
433
434static const struct bus_type serdev_bus_type = {
435 .name = "serial",
436 .match = serdev_device_match,
437 .probe = serdev_drv_probe,
438 .remove = serdev_drv_remove,
439};
440
441/**
442 * serdev_device_alloc() - Allocate a new serdev device
443 * @ctrl: associated controller
444 *
445 * Caller is responsible for either calling serdev_device_add() to add the
446 * newly allocated controller, or calling serdev_device_put() to discard it.
447 */
448struct serdev_device *serdev_device_alloc(struct serdev_controller *ctrl)
449{
450 struct serdev_device *serdev;
451
452 serdev = kzalloc(sizeof(*serdev), GFP_KERNEL);
453 if (!serdev)
454 return NULL;
455
456 serdev->ctrl = ctrl;
457 device_initialize(&serdev->dev);
458 serdev->dev.parent = &ctrl->dev;
459 serdev->dev.bus = &serdev_bus_type;
460 serdev->dev.type = &serdev_device_type;
461 init_completion(&serdev->write_comp);
462 mutex_init(&serdev->write_lock);
463 return serdev;
464}
465EXPORT_SYMBOL_GPL(serdev_device_alloc);
466
467/**
468 * serdev_controller_alloc() - Allocate a new serdev controller
469 * @host: serial port hardware controller device
470 * @parent: parent device
471 * @size: size of private data
472 *
473 * Caller is responsible for either calling serdev_controller_add() to add the
474 * newly allocated controller, or calling serdev_controller_put() to discard it.
475 * The allocated private data region may be accessed via
476 * serdev_controller_get_drvdata()
477 */
478struct serdev_controller *serdev_controller_alloc(struct device *host,
479 struct device *parent,
480 size_t size)
481{
482 struct serdev_controller *ctrl;
483 int id;
484
485 if (WARN_ON(!parent))
486 return NULL;
487
488 ctrl = kzalloc(sizeof(*ctrl) + size, GFP_KERNEL);
489 if (!ctrl)
490 return NULL;
491
492 id = ida_alloc(&ctrl_ida, GFP_KERNEL);
493 if (id < 0) {
494 dev_err(parent,
495 "unable to allocate serdev controller identifier.\n");
496 goto err_free;
497 }
498
499 ctrl->nr = id;
500
501 device_initialize(&ctrl->dev);
502 ctrl->dev.type = &serdev_ctrl_type;
503 ctrl->dev.bus = &serdev_bus_type;
504 ctrl->dev.parent = parent;
505 ctrl->host = host;
506 device_set_node(&ctrl->dev, dev_fwnode(host));
507 serdev_controller_set_drvdata(ctrl, &ctrl[1]);
508
509 dev_set_name(&ctrl->dev, "serial%d", id);
510
511 pm_runtime_no_callbacks(&ctrl->dev);
512 pm_suspend_ignore_children(&ctrl->dev, true);
513
514 dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id);
515 return ctrl;
516
517err_free:
518 kfree(ctrl);
519
520 return NULL;
521}
522EXPORT_SYMBOL_GPL(serdev_controller_alloc);
523
524static int of_serdev_register_devices(struct serdev_controller *ctrl)
525{
526 struct device_node *node;
527 struct serdev_device *serdev = NULL;
528 int err;
529 bool found = false;
530
531 for_each_available_child_of_node(ctrl->dev.of_node, node) {
532 if (!of_property_present(node, "compatible"))
533 continue;
534
535 dev_dbg(&ctrl->dev, "adding child %pOF\n", node);
536
537 serdev = serdev_device_alloc(ctrl);
538 if (!serdev)
539 continue;
540
541 device_set_node(&serdev->dev, of_fwnode_handle(node));
542
543 err = serdev_device_add(serdev);
544 if (err) {
545 dev_err(&serdev->dev,
546 "failure adding device. status %pe\n",
547 ERR_PTR(err));
548 serdev_device_put(serdev);
549 } else
550 found = true;
551 }
552 if (!found)
553 return -ENODEV;
554
555 return 0;
556}
557
558#ifdef CONFIG_ACPI
559
560#define SERDEV_ACPI_MAX_SCAN_DEPTH 32
561
562struct acpi_serdev_lookup {
563 acpi_handle device_handle;
564 acpi_handle controller_handle;
565 int n;
566 int index;
567};
568
569/**
570 * serdev_acpi_get_uart_resource - Gets UARTSerialBus resource if type matches
571 * @ares: ACPI resource
572 * @uart: Pointer to UARTSerialBus resource will be returned here
573 *
574 * Checks if the given ACPI resource is of type UARTSerialBus.
575 * In this case, returns a pointer to it to the caller.
576 *
577 * Return: True if resource type is of UARTSerialBus, otherwise false.
578 */
579bool serdev_acpi_get_uart_resource(struct acpi_resource *ares,
580 struct acpi_resource_uart_serialbus **uart)
581{
582 struct acpi_resource_uart_serialbus *sb;
583
584 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
585 return false;
586
587 sb = &ares->data.uart_serial_bus;
588 if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_UART)
589 return false;
590
591 *uart = sb;
592 return true;
593}
594EXPORT_SYMBOL_GPL(serdev_acpi_get_uart_resource);
595
596static int acpi_serdev_parse_resource(struct acpi_resource *ares, void *data)
597{
598 struct acpi_serdev_lookup *lookup = data;
599 struct acpi_resource_uart_serialbus *sb;
600 acpi_status status;
601
602 if (!serdev_acpi_get_uart_resource(ares, &sb))
603 return 1;
604
605 if (lookup->index != -1 && lookup->n++ != lookup->index)
606 return 1;
607
608 status = acpi_get_handle(lookup->device_handle,
609 sb->resource_source.string_ptr,
610 &lookup->controller_handle);
611 if (ACPI_FAILURE(status))
612 return 1;
613
614 /*
615 * NOTE: Ideally, we would also want to retrieve other properties here,
616 * once setting them before opening the device is supported by serdev.
617 */
618
619 return 1;
620}
621
622static int acpi_serdev_do_lookup(struct acpi_device *adev,
623 struct acpi_serdev_lookup *lookup)
624{
625 struct list_head resource_list;
626 int ret;
627
628 lookup->device_handle = acpi_device_handle(adev);
629 lookup->controller_handle = NULL;
630 lookup->n = 0;
631
632 INIT_LIST_HEAD(&resource_list);
633 ret = acpi_dev_get_resources(adev, &resource_list,
634 acpi_serdev_parse_resource, lookup);
635 acpi_dev_free_resource_list(&resource_list);
636
637 if (ret < 0)
638 return -EINVAL;
639
640 return 0;
641}
642
643static int acpi_serdev_check_resources(struct serdev_controller *ctrl,
644 struct acpi_device *adev)
645{
646 struct acpi_serdev_lookup lookup;
647 int ret;
648
649 if (acpi_bus_get_status(adev) || !adev->status.present)
650 return -EINVAL;
651
652 /* Look for UARTSerialBusV2 resource */
653 lookup.index = -1; // we only care for the last device
654
655 ret = acpi_serdev_do_lookup(adev, &lookup);
656 if (ret)
657 return ret;
658
659 /*
660 * Apple machines provide an empty resource template, so on those
661 * machines just look for immediate children with a "baud" property
662 * (from the _DSM method) instead.
663 */
664 if (!lookup.controller_handle && x86_apple_machine &&
665 !acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, NULL))
666 acpi_get_parent(adev->handle, &lookup.controller_handle);
667
668 /* Make sure controller and ResourceSource handle match */
669 if (!device_match_acpi_handle(ctrl->host, lookup.controller_handle))
670 return -ENODEV;
671
672 return 0;
673}
674
675static acpi_status acpi_serdev_register_device(struct serdev_controller *ctrl,
676 struct acpi_device *adev)
677{
678 struct serdev_device *serdev;
679 int err;
680
681 serdev = serdev_device_alloc(ctrl);
682 if (!serdev) {
683 dev_err(&ctrl->dev, "failed to allocate serdev device for %s\n",
684 dev_name(&adev->dev));
685 return AE_NO_MEMORY;
686 }
687
688 ACPI_COMPANION_SET(&serdev->dev, adev);
689 acpi_device_set_enumerated(adev);
690
691 err = serdev_device_add(serdev);
692 if (err) {
693 dev_err(&serdev->dev,
694 "failure adding ACPI serdev device. status %pe\n",
695 ERR_PTR(err));
696 serdev_device_put(serdev);
697 }
698
699 return AE_OK;
700}
701
702static const struct acpi_device_id serdev_acpi_devices_blacklist[] = {
703 { "INT3511", 0 },
704 { "INT3512", 0 },
705 { },
706};
707
708static acpi_status acpi_serdev_add_device(acpi_handle handle, u32 level,
709 void *data, void **return_value)
710{
711 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
712 struct serdev_controller *ctrl = data;
713
714 if (!adev || acpi_device_enumerated(adev))
715 return AE_OK;
716
717 /* Skip if black listed */
718 if (!acpi_match_device_ids(adev, serdev_acpi_devices_blacklist))
719 return AE_OK;
720
721 if (acpi_serdev_check_resources(ctrl, adev))
722 return AE_OK;
723
724 return acpi_serdev_register_device(ctrl, adev);
725}
726
727
728static int acpi_serdev_register_devices(struct serdev_controller *ctrl)
729{
730 acpi_status status;
731 bool skip;
732 int ret;
733
734 if (!has_acpi_companion(ctrl->host))
735 return -ENODEV;
736
737 /*
738 * Skip registration on boards where the ACPI tables are known to
739 * contain buggy devices. Note serdev_controller_add() must still
740 * succeed in this case, so that the proper serdev devices can be
741 * added "manually" later.
742 */
743 ret = acpi_quirk_skip_serdev_enumeration(ctrl->host, &skip);
744 if (ret)
745 return ret;
746 if (skip)
747 return 0;
748
749 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
750 SERDEV_ACPI_MAX_SCAN_DEPTH,
751 acpi_serdev_add_device, NULL, ctrl, NULL);
752 if (ACPI_FAILURE(status))
753 dev_warn(&ctrl->dev, "failed to enumerate serdev slaves\n");
754
755 if (!ctrl->serdev)
756 return -ENODEV;
757
758 return 0;
759}
760#else
761static inline int acpi_serdev_register_devices(struct serdev_controller *ctrl)
762{
763 return -ENODEV;
764}
765#endif /* CONFIG_ACPI */
766
767/**
768 * serdev_controller_add() - Add an serdev controller
769 * @ctrl: controller to be registered.
770 *
771 * Register a controller previously allocated via serdev_controller_alloc() with
772 * the serdev core.
773 */
774int serdev_controller_add(struct serdev_controller *ctrl)
775{
776 int ret_of, ret_acpi, ret;
777
778 /* Can't register until after driver model init */
779 if (WARN_ON(!is_registered))
780 return -EAGAIN;
781
782 ret = device_add(&ctrl->dev);
783 if (ret)
784 return ret;
785
786 pm_runtime_enable(&ctrl->dev);
787
788 ret_of = of_serdev_register_devices(ctrl);
789 ret_acpi = acpi_serdev_register_devices(ctrl);
790 if (ret_of && ret_acpi) {
791 dev_dbg(&ctrl->dev, "no devices registered: of:%pe acpi:%pe\n",
792 ERR_PTR(ret_of), ERR_PTR(ret_acpi));
793 ret = -ENODEV;
794 goto err_rpm_disable;
795 }
796
797 dev_dbg(&ctrl->dev, "serdev%d registered: dev:%p\n",
798 ctrl->nr, &ctrl->dev);
799 return 0;
800
801err_rpm_disable:
802 pm_runtime_disable(&ctrl->dev);
803 device_del(&ctrl->dev);
804 return ret;
805};
806EXPORT_SYMBOL_GPL(serdev_controller_add);
807
808/* Remove a device associated with a controller */
809static int serdev_remove_device(struct device *dev, void *data)
810{
811 struct serdev_device *serdev = to_serdev_device(dev);
812 if (dev->type == &serdev_device_type)
813 serdev_device_remove(serdev);
814 return 0;
815}
816
817/**
818 * serdev_controller_remove(): remove an serdev controller
819 * @ctrl: controller to remove
820 *
821 * Remove a serdev controller. Caller is responsible for calling
822 * serdev_controller_put() to discard the allocated controller.
823 */
824void serdev_controller_remove(struct serdev_controller *ctrl)
825{
826 if (!ctrl)
827 return;
828
829 device_for_each_child(&ctrl->dev, NULL, serdev_remove_device);
830 pm_runtime_disable(&ctrl->dev);
831 device_del(&ctrl->dev);
832}
833EXPORT_SYMBOL_GPL(serdev_controller_remove);
834
835/**
836 * __serdev_device_driver_register() - Register client driver with serdev core
837 * @sdrv: client driver to be associated with client-device.
838 * @owner: client driver owner to set.
839 *
840 * This API will register the client driver with the serdev framework.
841 * It is typically called from the driver's module-init function.
842 */
843int __serdev_device_driver_register(struct serdev_device_driver *sdrv, struct module *owner)
844{
845 sdrv->driver.bus = &serdev_bus_type;
846 sdrv->driver.owner = owner;
847
848 /* force drivers to async probe so I/O is possible in probe */
849 sdrv->driver.probe_type = PROBE_PREFER_ASYNCHRONOUS;
850
851 return driver_register(&sdrv->driver);
852}
853EXPORT_SYMBOL_GPL(__serdev_device_driver_register);
854
855static void __exit serdev_exit(void)
856{
857 bus_unregister(&serdev_bus_type);
858 ida_destroy(&ctrl_ida);
859}
860module_exit(serdev_exit);
861
862static int __init serdev_init(void)
863{
864 int ret;
865
866 ret = bus_register(&serdev_bus_type);
867 if (ret)
868 return ret;
869
870 is_registered = true;
871 return 0;
872}
873/* Must be before serial drivers register */
874postcore_initcall(serdev_init);
875
876MODULE_AUTHOR("Rob Herring <robh@kernel.org>");
877MODULE_LICENSE("GPL v2");
878MODULE_DESCRIPTION("Serial attached device bus");