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e3b3d0f5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
cd6484e1 RH |
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. | |
cd6484e1 RH |
7 | */ |
8 | ||
53c76263 | 9 | #include <linux/acpi.h> |
cd6484e1 RH |
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> | |
76d8ca24 | 16 | #include <linux/pm_domain.h> |
c3bf40ce | 17 | #include <linux/pm_runtime.h> |
22d66c85 | 18 | #include <linux/sched.h> |
cd6484e1 RH |
19 | #include <linux/serdev.h> |
20 | #include <linux/slab.h> | |
35d4670a | 21 | #include <linux/platform_data/x86/apple.h> |
cd6484e1 RH |
22 | |
23 | static bool is_registered; | |
24 | static DEFINE_IDA(ctrl_ida); | |
25 | ||
2460942f JH |
26 | static ssize_t modalias_show(struct device *dev, |
27 | struct device_attribute *attr, char *buf) | |
28 | { | |
29 | int len; | |
30 | ||
31 | len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); | |
32 | if (len != -ENODEV) | |
33 | return len; | |
34 | ||
35 | return of_device_modalias(dev, buf, PAGE_SIZE); | |
36 | } | |
37 | static DEVICE_ATTR_RO(modalias); | |
38 | ||
39 | static struct attribute *serdev_device_attrs[] = { | |
40 | &dev_attr_modalias.attr, | |
41 | NULL, | |
42 | }; | |
43 | ATTRIBUTE_GROUPS(serdev_device); | |
44 | ||
45 | static int serdev_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
46 | { | |
47 | int rc; | |
48 | ||
49 | /* TODO: platform modalias */ | |
50 | ||
51 | rc = acpi_device_uevent_modalias(dev, env); | |
52 | if (rc != -ENODEV) | |
53 | return rc; | |
54 | ||
55 | return of_device_uevent_modalias(dev, env); | |
56 | } | |
57 | ||
cd6484e1 RH |
58 | static void serdev_device_release(struct device *dev) |
59 | { | |
60 | struct serdev_device *serdev = to_serdev_device(dev); | |
61 | kfree(serdev); | |
62 | } | |
63 | ||
64 | static const struct device_type serdev_device_type = { | |
2460942f JH |
65 | .groups = serdev_device_groups, |
66 | .uevent = serdev_device_uevent, | |
cd6484e1 RH |
67 | .release = serdev_device_release, |
68 | }; | |
69 | ||
7ee69102 JH |
70 | static bool is_serdev_device(const struct device *dev) |
71 | { | |
72 | return dev->type == &serdev_device_type; | |
73 | } | |
74 | ||
cd6484e1 RH |
75 | static void serdev_ctrl_release(struct device *dev) |
76 | { | |
77 | struct serdev_controller *ctrl = to_serdev_controller(dev); | |
78 | ida_simple_remove(&ctrl_ida, ctrl->nr); | |
79 | kfree(ctrl); | |
80 | } | |
81 | ||
82 | static const struct device_type serdev_ctrl_type = { | |
83 | .release = serdev_ctrl_release, | |
84 | }; | |
85 | ||
86 | static int serdev_device_match(struct device *dev, struct device_driver *drv) | |
87 | { | |
7ee69102 JH |
88 | if (!is_serdev_device(dev)) |
89 | return 0; | |
90 | ||
53c76263 FD |
91 | /* TODO: platform matching */ |
92 | if (acpi_driver_match_device(dev, drv)) | |
93 | return 1; | |
94 | ||
cd6484e1 RH |
95 | return of_driver_match_device(dev, drv); |
96 | } | |
97 | ||
cd6484e1 RH |
98 | /** |
99 | * serdev_device_add() - add a device previously constructed via serdev_device_alloc() | |
100 | * @serdev: serdev_device to be added | |
101 | */ | |
102 | int serdev_device_add(struct serdev_device *serdev) | |
103 | { | |
08fcee28 | 104 | struct serdev_controller *ctrl = serdev->ctrl; |
cd6484e1 RH |
105 | struct device *parent = serdev->dev.parent; |
106 | int err; | |
107 | ||
108 | dev_set_name(&serdev->dev, "%s-%d", dev_name(parent), serdev->nr); | |
109 | ||
08fcee28 JH |
110 | /* Only a single slave device is currently supported. */ |
111 | if (ctrl->serdev) { | |
112 | dev_err(&serdev->dev, "controller busy\n"); | |
113 | return -EBUSY; | |
114 | } | |
115 | ctrl->serdev = serdev; | |
116 | ||
cd6484e1 RH |
117 | err = device_add(&serdev->dev); |
118 | if (err < 0) { | |
35781630 UKK |
119 | dev_err(&serdev->dev, "Can't add %s, status %pe\n", |
120 | dev_name(&serdev->dev), ERR_PTR(err)); | |
08fcee28 | 121 | goto err_clear_serdev; |
cd6484e1 RH |
122 | } |
123 | ||
124 | dev_dbg(&serdev->dev, "device %s registered\n", dev_name(&serdev->dev)); | |
125 | ||
08fcee28 JH |
126 | return 0; |
127 | ||
128 | err_clear_serdev: | |
129 | ctrl->serdev = NULL; | |
cd6484e1 RH |
130 | return err; |
131 | } | |
132 | EXPORT_SYMBOL_GPL(serdev_device_add); | |
133 | ||
134 | /** | |
135 | * serdev_device_remove(): remove an serdev device | |
136 | * @serdev: serdev_device to be removed | |
137 | */ | |
138 | void serdev_device_remove(struct serdev_device *serdev) | |
139 | { | |
08fcee28 JH |
140 | struct serdev_controller *ctrl = serdev->ctrl; |
141 | ||
cd6484e1 | 142 | device_unregister(&serdev->dev); |
08fcee28 | 143 | ctrl->serdev = NULL; |
cd6484e1 RH |
144 | } |
145 | EXPORT_SYMBOL_GPL(serdev_device_remove); | |
146 | ||
147 | int serdev_device_open(struct serdev_device *serdev) | |
148 | { | |
149 | struct serdev_controller *ctrl = serdev->ctrl; | |
c3bf40ce | 150 | int ret; |
cd6484e1 RH |
151 | |
152 | if (!ctrl || !ctrl->ops->open) | |
153 | return -EINVAL; | |
154 | ||
c3bf40ce JH |
155 | ret = ctrl->ops->open(ctrl); |
156 | if (ret) | |
157 | return ret; | |
158 | ||
159 | ret = pm_runtime_get_sync(&ctrl->dev); | |
160 | if (ret < 0) { | |
161 | pm_runtime_put_noidle(&ctrl->dev); | |
162 | goto err_close; | |
163 | } | |
164 | ||
165 | return 0; | |
166 | ||
167 | err_close: | |
168 | if (ctrl->ops->close) | |
169 | ctrl->ops->close(ctrl); | |
170 | ||
171 | return ret; | |
cd6484e1 RH |
172 | } |
173 | EXPORT_SYMBOL_GPL(serdev_device_open); | |
174 | ||
175 | void serdev_device_close(struct serdev_device *serdev) | |
176 | { | |
177 | struct serdev_controller *ctrl = serdev->ctrl; | |
178 | ||
179 | if (!ctrl || !ctrl->ops->close) | |
180 | return; | |
181 | ||
c3bf40ce JH |
182 | pm_runtime_put(&ctrl->dev); |
183 | ||
cd6484e1 RH |
184 | ctrl->ops->close(ctrl); |
185 | } | |
186 | EXPORT_SYMBOL_GPL(serdev_device_close); | |
187 | ||
2cb67d20 AS |
188 | static void devm_serdev_device_release(struct device *dev, void *dr) |
189 | { | |
190 | serdev_device_close(*(struct serdev_device **)dr); | |
191 | } | |
192 | ||
193 | int devm_serdev_device_open(struct device *dev, struct serdev_device *serdev) | |
194 | { | |
195 | struct serdev_device **dr; | |
196 | int ret; | |
197 | ||
198 | dr = devres_alloc(devm_serdev_device_release, sizeof(*dr), GFP_KERNEL); | |
199 | if (!dr) | |
200 | return -ENOMEM; | |
201 | ||
202 | ret = serdev_device_open(serdev); | |
203 | if (ret) { | |
204 | devres_free(dr); | |
205 | return ret; | |
206 | } | |
207 | ||
208 | *dr = serdev; | |
209 | devres_add(dev, dr); | |
210 | ||
211 | return 0; | |
212 | } | |
213 | EXPORT_SYMBOL_GPL(devm_serdev_device_open); | |
214 | ||
6fe729c4 AS |
215 | void serdev_device_write_wakeup(struct serdev_device *serdev) |
216 | { | |
217 | complete(&serdev->write_comp); | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(serdev_device_write_wakeup); | |
220 | ||
2d13969e JH |
221 | /** |
222 | * serdev_device_write_buf() - write data asynchronously | |
223 | * @serdev: serdev device | |
224 | * @buf: data to be written | |
225 | * @count: number of bytes to write | |
226 | * | |
227 | * Write data to the device asynchronously. | |
228 | * | |
229 | * Note that any accepted data has only been buffered by the controller; use | |
230 | * serdev_device_wait_until_sent() to make sure the controller write buffer | |
231 | * has actually been emptied. | |
232 | * | |
233 | * Return: The number of bytes written (less than count if not enough room in | |
234 | * the write buffer), or a negative errno on errors. | |
235 | */ | |
6bdc00d0 SW |
236 | int serdev_device_write_buf(struct serdev_device *serdev, |
237 | const unsigned char *buf, size_t count) | |
238 | { | |
239 | struct serdev_controller *ctrl = serdev->ctrl; | |
240 | ||
241 | if (!ctrl || !ctrl->ops->write_buf) | |
242 | return -EINVAL; | |
243 | ||
244 | return ctrl->ops->write_buf(ctrl, buf, count); | |
245 | } | |
246 | EXPORT_SYMBOL_GPL(serdev_device_write_buf); | |
247 | ||
2d13969e JH |
248 | /** |
249 | * serdev_device_write() - write data synchronously | |
250 | * @serdev: serdev device | |
251 | * @buf: data to be written | |
252 | * @count: number of bytes to write | |
253 | * @timeout: timeout in jiffies, or 0 to wait indefinitely | |
254 | * | |
255 | * Write data to the device synchronously by repeatedly calling | |
256 | * serdev_device_write() until the controller has accepted all data (unless | |
257 | * interrupted by a timeout or a signal). | |
258 | * | |
259 | * Note that any accepted data has only been buffered by the controller; use | |
260 | * serdev_device_wait_until_sent() to make sure the controller write buffer | |
261 | * has actually been emptied. | |
262 | * | |
263 | * Note that this function depends on serdev_device_write_wakeup() being | |
264 | * called in the serdev driver write_wakeup() callback. | |
265 | * | |
266 | * Return: The number of bytes written (less than count if interrupted), | |
267 | * -ETIMEDOUT or -ERESTARTSYS if interrupted before any bytes were written, or | |
268 | * a negative errno on errors. | |
269 | */ | |
6fe729c4 AS |
270 | int serdev_device_write(struct serdev_device *serdev, |
271 | const unsigned char *buf, size_t count, | |
70d18804 | 272 | long timeout) |
cd6484e1 RH |
273 | { |
274 | struct serdev_controller *ctrl = serdev->ctrl; | |
0bbf0a88 | 275 | int written = 0; |
6fe729c4 | 276 | int ret; |
cd6484e1 | 277 | |
22d66c85 | 278 | if (!ctrl || !ctrl->ops->write_buf || !serdev->ops->write_wakeup) |
cd6484e1 RH |
279 | return -EINVAL; |
280 | ||
22d66c85 JH |
281 | if (timeout == 0) |
282 | timeout = MAX_SCHEDULE_TIMEOUT; | |
283 | ||
6fe729c4 AS |
284 | mutex_lock(&serdev->write_lock); |
285 | do { | |
286 | reinit_completion(&serdev->write_comp); | |
287 | ||
288 | ret = ctrl->ops->write_buf(ctrl, buf, count); | |
289 | if (ret < 0) | |
290 | break; | |
291 | ||
0bbf0a88 | 292 | written += ret; |
6fe729c4 AS |
293 | buf += ret; |
294 | count -= ret; | |
70d18804 JH |
295 | |
296 | if (count == 0) | |
297 | break; | |
298 | ||
299 | timeout = wait_for_completion_interruptible_timeout(&serdev->write_comp, | |
300 | timeout); | |
301 | } while (timeout > 0); | |
6fe729c4 | 302 | mutex_unlock(&serdev->write_lock); |
0bbf0a88 JH |
303 | |
304 | if (ret < 0) | |
305 | return ret; | |
306 | ||
70d18804 JH |
307 | if (timeout <= 0 && written == 0) { |
308 | if (timeout == -ERESTARTSYS) | |
309 | return -ERESTARTSYS; | |
310 | else | |
311 | return -ETIMEDOUT; | |
312 | } | |
0bbf0a88 JH |
313 | |
314 | return written; | |
cd6484e1 | 315 | } |
6fe729c4 | 316 | EXPORT_SYMBOL_GPL(serdev_device_write); |
cd6484e1 RH |
317 | |
318 | void serdev_device_write_flush(struct serdev_device *serdev) | |
319 | { | |
320 | struct serdev_controller *ctrl = serdev->ctrl; | |
321 | ||
322 | if (!ctrl || !ctrl->ops->write_flush) | |
323 | return; | |
324 | ||
325 | ctrl->ops->write_flush(ctrl); | |
326 | } | |
327 | EXPORT_SYMBOL_GPL(serdev_device_write_flush); | |
328 | ||
329 | int serdev_device_write_room(struct serdev_device *serdev) | |
330 | { | |
331 | struct serdev_controller *ctrl = serdev->ctrl; | |
332 | ||
333 | if (!ctrl || !ctrl->ops->write_room) | |
334 | return 0; | |
335 | ||
336 | return serdev->ctrl->ops->write_room(ctrl); | |
337 | } | |
338 | EXPORT_SYMBOL_GPL(serdev_device_write_room); | |
339 | ||
340 | unsigned int serdev_device_set_baudrate(struct serdev_device *serdev, unsigned int speed) | |
341 | { | |
342 | struct serdev_controller *ctrl = serdev->ctrl; | |
343 | ||
344 | if (!ctrl || !ctrl->ops->set_baudrate) | |
345 | return 0; | |
346 | ||
347 | return ctrl->ops->set_baudrate(ctrl, speed); | |
348 | ||
349 | } | |
350 | EXPORT_SYMBOL_GPL(serdev_device_set_baudrate); | |
351 | ||
352 | void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable) | |
353 | { | |
354 | struct serdev_controller *ctrl = serdev->ctrl; | |
355 | ||
356 | if (!ctrl || !ctrl->ops->set_flow_control) | |
357 | return; | |
358 | ||
359 | ctrl->ops->set_flow_control(ctrl, enable); | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(serdev_device_set_flow_control); | |
362 | ||
3a19cfcc UH |
363 | int serdev_device_set_parity(struct serdev_device *serdev, |
364 | enum serdev_parity parity) | |
365 | { | |
366 | struct serdev_controller *ctrl = serdev->ctrl; | |
367 | ||
368 | if (!ctrl || !ctrl->ops->set_parity) | |
369 | return -ENOTSUPP; | |
370 | ||
371 | return ctrl->ops->set_parity(ctrl, parity); | |
372 | } | |
373 | EXPORT_SYMBOL_GPL(serdev_device_set_parity); | |
374 | ||
b3f80c8f SR |
375 | void serdev_device_wait_until_sent(struct serdev_device *serdev, long timeout) |
376 | { | |
377 | struct serdev_controller *ctrl = serdev->ctrl; | |
378 | ||
379 | if (!ctrl || !ctrl->ops->wait_until_sent) | |
380 | return; | |
381 | ||
382 | ctrl->ops->wait_until_sent(ctrl, timeout); | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(serdev_device_wait_until_sent); | |
385 | ||
5659dab2 SR |
386 | int serdev_device_get_tiocm(struct serdev_device *serdev) |
387 | { | |
388 | struct serdev_controller *ctrl = serdev->ctrl; | |
389 | ||
390 | if (!ctrl || !ctrl->ops->get_tiocm) | |
391 | return -ENOTSUPP; | |
392 | ||
393 | return ctrl->ops->get_tiocm(ctrl); | |
394 | } | |
395 | EXPORT_SYMBOL_GPL(serdev_device_get_tiocm); | |
396 | ||
397 | int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear) | |
398 | { | |
399 | struct serdev_controller *ctrl = serdev->ctrl; | |
400 | ||
401 | if (!ctrl || !ctrl->ops->set_tiocm) | |
402 | return -ENOTSUPP; | |
403 | ||
404 | return ctrl->ops->set_tiocm(ctrl, set, clear); | |
405 | } | |
406 | EXPORT_SYMBOL_GPL(serdev_device_set_tiocm); | |
407 | ||
cd6484e1 RH |
408 | static int serdev_drv_probe(struct device *dev) |
409 | { | |
410 | const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver); | |
76d8ca24 | 411 | int ret; |
cd6484e1 | 412 | |
76d8ca24 SW |
413 | ret = dev_pm_domain_attach(dev, true); |
414 | if (ret) | |
415 | return ret; | |
416 | ||
417 | ret = sdrv->probe(to_serdev_device(dev)); | |
418 | if (ret) | |
419 | dev_pm_domain_detach(dev, true); | |
420 | ||
421 | return ret; | |
cd6484e1 RH |
422 | } |
423 | ||
424 | static int serdev_drv_remove(struct device *dev) | |
425 | { | |
426 | const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver); | |
c5ff7de2 AS |
427 | if (sdrv->remove) |
428 | sdrv->remove(to_serdev_device(dev)); | |
76d8ca24 SW |
429 | |
430 | dev_pm_domain_detach(dev, true); | |
431 | ||
cd6484e1 RH |
432 | return 0; |
433 | } | |
434 | ||
cd6484e1 RH |
435 | static struct bus_type serdev_bus_type = { |
436 | .name = "serial", | |
437 | .match = serdev_device_match, | |
438 | .probe = serdev_drv_probe, | |
439 | .remove = serdev_drv_remove, | |
cd6484e1 RH |
440 | }; |
441 | ||
442 | /** | |
c5e3d207 | 443 | * serdev_device_alloc() - Allocate a new serdev device |
cd6484e1 RH |
444 | * @ctrl: associated controller |
445 | * | |
446 | * Caller is responsible for either calling serdev_device_add() to add the | |
447 | * newly allocated controller, or calling serdev_device_put() to discard it. | |
448 | */ | |
449 | struct serdev_device *serdev_device_alloc(struct serdev_controller *ctrl) | |
450 | { | |
451 | struct serdev_device *serdev; | |
452 | ||
453 | serdev = kzalloc(sizeof(*serdev), GFP_KERNEL); | |
454 | if (!serdev) | |
455 | return NULL; | |
456 | ||
457 | serdev->ctrl = ctrl; | |
cd6484e1 RH |
458 | device_initialize(&serdev->dev); |
459 | serdev->dev.parent = &ctrl->dev; | |
460 | serdev->dev.bus = &serdev_bus_type; | |
461 | serdev->dev.type = &serdev_device_type; | |
6fe729c4 AS |
462 | init_completion(&serdev->write_comp); |
463 | mutex_init(&serdev->write_lock); | |
cd6484e1 RH |
464 | return serdev; |
465 | } | |
466 | EXPORT_SYMBOL_GPL(serdev_device_alloc); | |
467 | ||
468 | /** | |
469 | * serdev_controller_alloc() - Allocate a new serdev controller | |
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 | */ | |
478 | struct serdev_controller *serdev_controller_alloc(struct device *parent, | |
479 | size_t size) | |
480 | { | |
481 | struct serdev_controller *ctrl; | |
482 | int id; | |
483 | ||
484 | if (WARN_ON(!parent)) | |
485 | return NULL; | |
486 | ||
487 | ctrl = kzalloc(sizeof(*ctrl) + size, GFP_KERNEL); | |
488 | if (!ctrl) | |
489 | return NULL; | |
490 | ||
cd6484e1 RH |
491 | id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL); |
492 | if (id < 0) { | |
493 | dev_err(parent, | |
494 | "unable to allocate serdev controller identifier.\n"); | |
978d6fac | 495 | goto err_free; |
cd6484e1 RH |
496 | } |
497 | ||
498 | ctrl->nr = id; | |
978d6fac JH |
499 | |
500 | device_initialize(&ctrl->dev); | |
501 | ctrl->dev.type = &serdev_ctrl_type; | |
502 | ctrl->dev.bus = &serdev_bus_type; | |
503 | ctrl->dev.parent = parent; | |
504 | ctrl->dev.of_node = parent->of_node; | |
505 | serdev_controller_set_drvdata(ctrl, &ctrl[1]); | |
506 | ||
cd6484e1 RH |
507 | dev_set_name(&ctrl->dev, "serial%d", id); |
508 | ||
c3bf40ce JH |
509 | pm_runtime_no_callbacks(&ctrl->dev); |
510 | pm_suspend_ignore_children(&ctrl->dev, true); | |
511 | ||
cd6484e1 RH |
512 | dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id); |
513 | return ctrl; | |
978d6fac JH |
514 | |
515 | err_free: | |
516 | kfree(ctrl); | |
517 | ||
518 | return NULL; | |
cd6484e1 RH |
519 | } |
520 | EXPORT_SYMBOL_GPL(serdev_controller_alloc); | |
521 | ||
522 | static int of_serdev_register_devices(struct serdev_controller *ctrl) | |
523 | { | |
524 | struct device_node *node; | |
525 | struct serdev_device *serdev = NULL; | |
526 | int err; | |
527 | bool found = false; | |
528 | ||
529 | for_each_available_child_of_node(ctrl->dev.of_node, node) { | |
530 | if (!of_get_property(node, "compatible", NULL)) | |
531 | continue; | |
532 | ||
a73ee843 | 533 | dev_dbg(&ctrl->dev, "adding child %pOF\n", node); |
cd6484e1 RH |
534 | |
535 | serdev = serdev_device_alloc(ctrl); | |
536 | if (!serdev) | |
537 | continue; | |
538 | ||
539 | serdev->dev.of_node = node; | |
540 | ||
541 | err = serdev_device_add(serdev); | |
542 | if (err) { | |
543 | dev_err(&serdev->dev, | |
35781630 UKK |
544 | "failure adding device. status %pe\n", |
545 | ERR_PTR(err)); | |
cd6484e1 RH |
546 | serdev_device_put(serdev); |
547 | } else | |
548 | found = true; | |
549 | } | |
550 | if (!found) | |
551 | return -ENODEV; | |
552 | ||
553 | return 0; | |
554 | } | |
555 | ||
53c76263 | 556 | #ifdef CONFIG_ACPI |
33364d63 ML |
557 | |
558 | #define SERDEV_ACPI_MAX_SCAN_DEPTH 32 | |
559 | ||
560 | struct acpi_serdev_lookup { | |
561 | acpi_handle device_handle; | |
562 | acpi_handle controller_handle; | |
563 | int n; | |
564 | int index; | |
565 | }; | |
566 | ||
567 | static int acpi_serdev_parse_resource(struct acpi_resource *ares, void *data) | |
568 | { | |
569 | struct acpi_serdev_lookup *lookup = data; | |
570 | struct acpi_resource_uart_serialbus *sb; | |
571 | acpi_status status; | |
572 | ||
573 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
574 | return 1; | |
575 | ||
576 | if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART) | |
577 | return 1; | |
578 | ||
579 | if (lookup->index != -1 && lookup->n++ != lookup->index) | |
580 | return 1; | |
581 | ||
582 | sb = &ares->data.uart_serial_bus; | |
583 | ||
584 | status = acpi_get_handle(lookup->device_handle, | |
585 | sb->resource_source.string_ptr, | |
586 | &lookup->controller_handle); | |
587 | if (ACPI_FAILURE(status)) | |
588 | return 1; | |
589 | ||
590 | /* | |
591 | * NOTE: Ideally, we would also want to retreive other properties here, | |
592 | * once setting them before opening the device is supported by serdev. | |
593 | */ | |
594 | ||
595 | return 1; | |
596 | } | |
597 | ||
598 | static int acpi_serdev_do_lookup(struct acpi_device *adev, | |
599 | struct acpi_serdev_lookup *lookup) | |
600 | { | |
601 | struct list_head resource_list; | |
602 | int ret; | |
603 | ||
604 | lookup->device_handle = acpi_device_handle(adev); | |
605 | lookup->controller_handle = NULL; | |
606 | lookup->n = 0; | |
607 | ||
608 | INIT_LIST_HEAD(&resource_list); | |
609 | ret = acpi_dev_get_resources(adev, &resource_list, | |
610 | acpi_serdev_parse_resource, lookup); | |
611 | acpi_dev_free_resource_list(&resource_list); | |
612 | ||
613 | if (ret < 0) | |
614 | return -EINVAL; | |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
619 | static int acpi_serdev_check_resources(struct serdev_controller *ctrl, | |
620 | struct acpi_device *adev) | |
621 | { | |
622 | struct acpi_serdev_lookup lookup; | |
623 | int ret; | |
624 | ||
625 | if (acpi_bus_get_status(adev) || !adev->status.present) | |
626 | return -EINVAL; | |
627 | ||
628 | /* Look for UARTSerialBusV2 resource */ | |
629 | lookup.index = -1; // we only care for the last device | |
630 | ||
631 | ret = acpi_serdev_do_lookup(adev, &lookup); | |
632 | if (ret) | |
633 | return ret; | |
634 | ||
35d4670a RT |
635 | /* |
636 | * Apple machines provide an empty resource template, so on those | |
637 | * machines just look for immediate children with a "baud" property | |
638 | * (from the _DSM method) instead. | |
639 | */ | |
640 | if (!lookup.controller_handle && x86_apple_machine && | |
641 | !acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, NULL)) | |
642 | acpi_get_parent(adev->handle, &lookup.controller_handle); | |
643 | ||
33364d63 ML |
644 | /* Make sure controller and ResourceSource handle match */ |
645 | if (ACPI_HANDLE(ctrl->dev.parent) != lookup.controller_handle) | |
646 | return -ENODEV; | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
53c76263 | 651 | static acpi_status acpi_serdev_register_device(struct serdev_controller *ctrl, |
33364d63 | 652 | struct acpi_device *adev) |
53c76263 | 653 | { |
33364d63 | 654 | struct serdev_device *serdev; |
53c76263 FD |
655 | int err; |
656 | ||
53c76263 FD |
657 | serdev = serdev_device_alloc(ctrl); |
658 | if (!serdev) { | |
659 | dev_err(&ctrl->dev, "failed to allocate serdev device for %s\n", | |
660 | dev_name(&adev->dev)); | |
661 | return AE_NO_MEMORY; | |
662 | } | |
663 | ||
664 | ACPI_COMPANION_SET(&serdev->dev, adev); | |
665 | acpi_device_set_enumerated(adev); | |
666 | ||
667 | err = serdev_device_add(serdev); | |
668 | if (err) { | |
669 | dev_err(&serdev->dev, | |
35781630 UKK |
670 | "failure adding ACPI serdev device. status %pe\n", |
671 | ERR_PTR(err)); | |
53c76263 FD |
672 | serdev_device_put(serdev); |
673 | } | |
674 | ||
675 | return AE_OK; | |
676 | } | |
677 | ||
c5ee0b31 PA |
678 | static const struct acpi_device_id serdev_acpi_devices_blacklist[] = { |
679 | { "INT3511", 0 }, | |
680 | { "INT3512", 0 }, | |
681 | { }, | |
682 | }; | |
683 | ||
53c76263 | 684 | static acpi_status acpi_serdev_add_device(acpi_handle handle, u32 level, |
33364d63 | 685 | void *data, void **return_value) |
53c76263 FD |
686 | { |
687 | struct serdev_controller *ctrl = data; | |
688 | struct acpi_device *adev; | |
689 | ||
690 | if (acpi_bus_get_device(handle, &adev)) | |
691 | return AE_OK; | |
692 | ||
33364d63 ML |
693 | if (acpi_device_enumerated(adev)) |
694 | return AE_OK; | |
695 | ||
c5ee0b31 PA |
696 | /* Skip if black listed */ |
697 | if (!acpi_match_device_ids(adev, serdev_acpi_devices_blacklist)) | |
698 | return AE_OK; | |
699 | ||
33364d63 ML |
700 | if (acpi_serdev_check_resources(ctrl, adev)) |
701 | return AE_OK; | |
702 | ||
53c76263 FD |
703 | return acpi_serdev_register_device(ctrl, adev); |
704 | } | |
705 | ||
33364d63 | 706 | |
53c76263 FD |
707 | static int acpi_serdev_register_devices(struct serdev_controller *ctrl) |
708 | { | |
709 | acpi_status status; | |
53c76263 | 710 | |
33364d63 | 711 | if (!has_acpi_companion(ctrl->dev.parent)) |
53c76263 FD |
712 | return -ENODEV; |
713 | ||
33364d63 ML |
714 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
715 | SERDEV_ACPI_MAX_SCAN_DEPTH, | |
53c76263 FD |
716 | acpi_serdev_add_device, NULL, ctrl, NULL); |
717 | if (ACPI_FAILURE(status)) | |
33364d63 | 718 | dev_warn(&ctrl->dev, "failed to enumerate serdev slaves\n"); |
53c76263 FD |
719 | |
720 | if (!ctrl->serdev) | |
721 | return -ENODEV; | |
722 | ||
723 | return 0; | |
724 | } | |
725 | #else | |
726 | static inline int acpi_serdev_register_devices(struct serdev_controller *ctrl) | |
727 | { | |
728 | return -ENODEV; | |
729 | } | |
730 | #endif /* CONFIG_ACPI */ | |
731 | ||
cd6484e1 RH |
732 | /** |
733 | * serdev_controller_add() - Add an serdev controller | |
734 | * @ctrl: controller to be registered. | |
735 | * | |
736 | * Register a controller previously allocated via serdev_controller_alloc() with | |
737 | * the serdev core. | |
738 | */ | |
739 | int serdev_controller_add(struct serdev_controller *ctrl) | |
740 | { | |
53c76263 | 741 | int ret_of, ret_acpi, ret; |
cd6484e1 RH |
742 | |
743 | /* Can't register until after driver model init */ | |
744 | if (WARN_ON(!is_registered)) | |
745 | return -EAGAIN; | |
746 | ||
747 | ret = device_add(&ctrl->dev); | |
748 | if (ret) | |
749 | return ret; | |
750 | ||
c3bf40ce JH |
751 | pm_runtime_enable(&ctrl->dev); |
752 | ||
53c76263 FD |
753 | ret_of = of_serdev_register_devices(ctrl); |
754 | ret_acpi = acpi_serdev_register_devices(ctrl); | |
755 | if (ret_of && ret_acpi) { | |
35781630 UKK |
756 | dev_dbg(&ctrl->dev, "no devices registered: of:%pe acpi:%pe\n", |
757 | ERR_PTR(ret_of), ERR_PTR(ret_acpi)); | |
53c76263 | 758 | ret = -ENODEV; |
c3bf40ce | 759 | goto err_rpm_disable; |
53c76263 | 760 | } |
cd6484e1 RH |
761 | |
762 | dev_dbg(&ctrl->dev, "serdev%d registered: dev:%p\n", | |
763 | ctrl->nr, &ctrl->dev); | |
764 | return 0; | |
765 | ||
c3bf40ce JH |
766 | err_rpm_disable: |
767 | pm_runtime_disable(&ctrl->dev); | |
cd6484e1 RH |
768 | device_del(&ctrl->dev); |
769 | return ret; | |
770 | }; | |
771 | EXPORT_SYMBOL_GPL(serdev_controller_add); | |
772 | ||
773 | /* Remove a device associated with a controller */ | |
774 | static int serdev_remove_device(struct device *dev, void *data) | |
775 | { | |
776 | struct serdev_device *serdev = to_serdev_device(dev); | |
777 | if (dev->type == &serdev_device_type) | |
778 | serdev_device_remove(serdev); | |
779 | return 0; | |
780 | } | |
781 | ||
782 | /** | |
783 | * serdev_controller_remove(): remove an serdev controller | |
784 | * @ctrl: controller to remove | |
785 | * | |
786 | * Remove a serdev controller. Caller is responsible for calling | |
787 | * serdev_controller_put() to discard the allocated controller. | |
788 | */ | |
789 | void serdev_controller_remove(struct serdev_controller *ctrl) | |
790 | { | |
791 | int dummy; | |
792 | ||
793 | if (!ctrl) | |
794 | return; | |
795 | ||
796 | dummy = device_for_each_child(&ctrl->dev, NULL, | |
797 | serdev_remove_device); | |
c3bf40ce | 798 | pm_runtime_disable(&ctrl->dev); |
cd6484e1 RH |
799 | device_del(&ctrl->dev); |
800 | } | |
801 | EXPORT_SYMBOL_GPL(serdev_controller_remove); | |
802 | ||
803 | /** | |
804 | * serdev_driver_register() - Register client driver with serdev core | |
805 | * @sdrv: client driver to be associated with client-device. | |
806 | * | |
807 | * This API will register the client driver with the serdev framework. | |
808 | * It is typically called from the driver's module-init function. | |
809 | */ | |
810 | int __serdev_device_driver_register(struct serdev_device_driver *sdrv, struct module *owner) | |
811 | { | |
812 | sdrv->driver.bus = &serdev_bus_type; | |
813 | sdrv->driver.owner = owner; | |
814 | ||
815 | /* force drivers to async probe so I/O is possible in probe */ | |
816 | sdrv->driver.probe_type = PROBE_PREFER_ASYNCHRONOUS; | |
817 | ||
818 | return driver_register(&sdrv->driver); | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(__serdev_device_driver_register); | |
821 | ||
822 | static void __exit serdev_exit(void) | |
823 | { | |
824 | bus_unregister(&serdev_bus_type); | |
bc6cf366 | 825 | ida_destroy(&ctrl_ida); |
cd6484e1 RH |
826 | } |
827 | module_exit(serdev_exit); | |
828 | ||
829 | static int __init serdev_init(void) | |
830 | { | |
831 | int ret; | |
832 | ||
833 | ret = bus_register(&serdev_bus_type); | |
834 | if (ret) | |
835 | return ret; | |
836 | ||
837 | is_registered = true; | |
838 | return 0; | |
839 | } | |
840 | /* Must be before serial drivers register */ | |
841 | postcore_initcall(serdev_init); | |
842 | ||
843 | MODULE_AUTHOR("Rob Herring <robh@kernel.org>"); | |
844 | MODULE_LICENSE("GPL v2"); | |
845 | MODULE_DESCRIPTION("Serial attached device bus"); |