1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org>
6  * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
33 	len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);  in modalias_show()
34 	if (len != -ENODEV)  in modalias_show()
54 	if (rc != -ENODEV)  in serdev_device_uevent()
74 	return dev->type == &serdev_device_type;  in is_serdev_device()
80 	ida_free(&ctrl_ida, ctrl->nr);  in serdev_ctrl_release()
101  * serdev_device_add() - add a device previously constructed via serdev_device_alloc()
106 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_add()
107 	struct device *parent = serdev->dev.parent;  in serdev_device_add()
110 	dev_set_name(&serdev->dev, "%s-%d", dev_name(parent), serdev->nr);  in serdev_device_add()
113 	if (ctrl->serdev) {  in serdev_device_add()
114 		dev_err(&serdev->dev, "controller busy\n");  in serdev_device_add()
115 		return -EBUSY;  in serdev_device_add()
117 	ctrl->serdev = serdev;  in serdev_device_add()
119 	err = device_add(&serdev->dev);  in serdev_device_add()
121 		dev_err(&serdev->dev, "Can't add %s, status %pe\n",  in serdev_device_add()
122 			dev_name(&serdev->dev), ERR_PTR(err));  in serdev_device_add()
126 	dev_dbg(&serdev->dev, "device %s registered\n", dev_name(&serdev->dev));  in serdev_device_add()
131 	ctrl->serdev = NULL;  in serdev_device_add()
142 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_remove()
144 	device_unregister(&serdev->dev);  in serdev_device_remove()
145 	ctrl->serdev = NULL;  in serdev_device_remove()
151 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_open()
154 	if (!ctrl || !ctrl->ops->open)  in serdev_device_open()
155 		return -EINVAL;  in serdev_device_open()
157 	ret = ctrl->ops->open(ctrl);  in serdev_device_open()
161 	ret = pm_runtime_get_sync(&ctrl->dev);  in serdev_device_open()
163 		pm_runtime_put_noidle(&ctrl->dev);  in serdev_device_open()
170 	if (ctrl->ops->close)  in serdev_device_open()
171 		ctrl->ops->close(ctrl);  in serdev_device_open()
179 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_close()
181 	if (!ctrl || !ctrl->ops->close)  in serdev_device_close()
184 	pm_runtime_put(&ctrl->dev);  in serdev_device_close()
186 	ctrl->ops->close(ctrl);  in serdev_device_close()
209 	complete(&serdev->write_comp);  in serdev_device_write_wakeup()
214  * serdev_device_write_buf() - write data asynchronously
221  * Note that any accepted data has only been buffered by the controller; use
226  * the write buffer), or a negative errno on errors.
230 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_write_buf()
232 	if (!ctrl || !ctrl->ops->write_buf)  in serdev_device_write_buf()
233 		return -EINVAL;  in serdev_device_write_buf()
235 	return ctrl->ops->write_buf(ctrl, buf, count);  in serdev_device_write_buf()
240  * serdev_device_write() - write data synchronously
250  * Note that any accepted data has only been buffered by the controller; use
258  * -ETIMEDOUT or -ERESTARTSYS if interrupted before any bytes were written, or
259  * a negative errno on errors.
264 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_write()
268 	if (!ctrl || !ctrl->ops->write_buf || !serdev->ops->write_wakeup)  in serdev_device_write()
269 		return -EINVAL;  in serdev_device_write()
274 	mutex_lock(&serdev->write_lock);  in serdev_device_write()
276 		reinit_completion(&serdev->write_comp);  in serdev_device_write()
278 		ret = ctrl->ops->write_buf(ctrl, buf, count);  in serdev_device_write()
284 		count -= ret;  in serdev_device_write()
289 		timeout = wait_for_completion_interruptible_timeout(&serdev->write_comp,  in serdev_device_write()
292 	mutex_unlock(&serdev->write_lock);  in serdev_device_write()
298 		if (timeout == -ERESTARTSYS)  in serdev_device_write()
299 			return -ERESTARTSYS;  in serdev_device_write()
301 			return -ETIMEDOUT;  in serdev_device_write()
310 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_write_flush()
312 	if (!ctrl || !ctrl->ops->write_flush)  in serdev_device_write_flush()
315 	ctrl->ops->write_flush(ctrl);  in serdev_device_write_flush()
321 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_write_room()
323 	if (!ctrl || !ctrl->ops->write_room)  in serdev_device_write_room()
326 	return serdev->ctrl->ops->write_room(ctrl);  in serdev_device_write_room()
332 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_set_baudrate()
334 	if (!ctrl || !ctrl->ops->set_baudrate)  in serdev_device_set_baudrate()
337 	return ctrl->ops->set_baudrate(ctrl, speed);  in serdev_device_set_baudrate()
344 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_set_flow_control()
346 	if (!ctrl || !ctrl->ops->set_flow_control)  in serdev_device_set_flow_control()
349 	ctrl->ops->set_flow_control(ctrl, enable);  in serdev_device_set_flow_control()
356 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_set_parity()
358 	if (!ctrl || !ctrl->ops->set_parity)  in serdev_device_set_parity()
359 		return -EOPNOTSUPP;  in serdev_device_set_parity()
361 	return ctrl->ops->set_parity(ctrl, parity);  in serdev_device_set_parity()
367 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_wait_until_sent()
369 	if (!ctrl || !ctrl->ops->wait_until_sent)  in serdev_device_wait_until_sent()
372 	ctrl->ops->wait_until_sent(ctrl, timeout);  in serdev_device_wait_until_sent()
378 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_get_tiocm()
380 	if (!ctrl || !ctrl->ops->get_tiocm)  in serdev_device_get_tiocm()
381 		return -EOPNOTSUPP;  in serdev_device_get_tiocm()
383 	return ctrl->ops->get_tiocm(ctrl);  in serdev_device_get_tiocm()
389 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_set_tiocm()
391 	if (!ctrl || !ctrl->ops->set_tiocm)  in serdev_device_set_tiocm()
392 		return -EOPNOTSUPP;  in serdev_device_set_tiocm()
394 	return ctrl->ops->set_tiocm(ctrl, set, clear);  in serdev_device_set_tiocm()
400 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_break_ctl()
402 	if (!ctrl || !ctrl->ops->break_ctl)  in serdev_device_break_ctl()
403 		return -EOPNOTSUPP;  in serdev_device_break_ctl()
405 	return ctrl->ops->break_ctl(ctrl, break_state);  in serdev_device_break_ctl()
411 	const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);  in serdev_drv_probe()
418 	ret = sdrv->probe(to_serdev_device(dev));  in serdev_drv_probe()
427 	const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);  in serdev_drv_remove()
428 	if (sdrv->remove)  in serdev_drv_remove()
429 		sdrv->remove(to_serdev_device(dev));  in serdev_drv_remove()
442  * serdev_device_alloc() - Allocate a new serdev device
456 	serdev->ctrl = ctrl;  in serdev_device_alloc()
457 	device_initialize(&serdev->dev);  in serdev_device_alloc()
458 	serdev->dev.parent = &ctrl->dev;  in serdev_device_alloc()
459 	serdev->dev.bus = &serdev_bus_type;  in serdev_device_alloc()
460 	serdev->dev.type = &serdev_device_type;  in serdev_device_alloc()
461 	init_completion(&serdev->write_comp);  in serdev_device_alloc()
462 	mutex_init(&serdev->write_lock);  in serdev_device_alloc()
468  * serdev_controller_alloc() - Allocate a new serdev controller
499 	ctrl->nr = id;  in serdev_controller_alloc()
501 	device_initialize(&ctrl->dev);  in serdev_controller_alloc()
502 	ctrl->dev.type = &serdev_ctrl_type;  in serdev_controller_alloc()
503 	ctrl->dev.bus = &serdev_bus_type;  in serdev_controller_alloc()
504 	ctrl->dev.parent = parent;  in serdev_controller_alloc()
505 	ctrl->host = host;  in serdev_controller_alloc()
506 	device_set_node(&ctrl->dev, dev_fwnode(host));  in serdev_controller_alloc()
509 	dev_set_name(&ctrl->dev, "serial%d", id);  in serdev_controller_alloc()
511 	pm_runtime_no_callbacks(&ctrl->dev);  in serdev_controller_alloc()
512 	pm_suspend_ignore_children(&ctrl->dev, true);  in serdev_controller_alloc()
514 	dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id);  in serdev_controller_alloc()
531 	for_each_available_child_of_node(ctrl->dev.of_node, node) {  in of_serdev_register_devices()
535 		dev_dbg(&ctrl->dev, "adding child %pOF\n", node);  in of_serdev_register_devices()
541 		device_set_node(&serdev->dev, of_fwnode_handle(node));  in of_serdev_register_devices()
545 			dev_err(&serdev->dev,  in of_serdev_register_devices()
553 		return -ENODEV;  in of_serdev_register_devices()
570  * serdev_acpi_get_uart_resource - Gets UARTSerialBus resource if type matches
584 	if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)  in serdev_acpi_get_uart_resource()
587 	sb = &ares->data.uart_serial_bus;  in serdev_acpi_get_uart_resource()
588 	if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_UART)  in serdev_acpi_get_uart_resource()
605 	if (lookup->index != -1 && lookup->n++ != lookup->index)  in acpi_serdev_parse_resource()
608 	status = acpi_get_handle(lookup->device_handle,  in acpi_serdev_parse_resource()
609 				 sb->resource_source.string_ptr,  in acpi_serdev_parse_resource()
610 				 &lookup->controller_handle);  in acpi_serdev_parse_resource()
628 	lookup->device_handle = acpi_device_handle(adev);  in acpi_serdev_do_lookup()
629 	lookup->controller_handle = NULL;  in acpi_serdev_do_lookup()
630 	lookup->n = 0;  in acpi_serdev_do_lookup()
638 		return -EINVAL;  in acpi_serdev_do_lookup()
649 	if (acpi_bus_get_status(adev) || !adev->status.present)  in acpi_serdev_check_resources()
650 		return -EINVAL;  in acpi_serdev_check_resources()
653 	lookup.index = -1;	// we only care for the last device  in acpi_serdev_check_resources()
666 		acpi_get_parent(adev->handle, &lookup.controller_handle);  in acpi_serdev_check_resources()
669 	if (!device_match_acpi_handle(ctrl->host, lookup.controller_handle))  in acpi_serdev_check_resources()
670 		return -ENODEV;  in acpi_serdev_check_resources()
683 		dev_err(&ctrl->dev, "failed to allocate serdev device for %s\n",  in acpi_serdev_register_device()
684 			dev_name(&adev->dev));  in acpi_serdev_register_device()
688 	ACPI_COMPANION_SET(&serdev->dev, adev);  in acpi_serdev_register_device()
693 		dev_err(&serdev->dev,  in acpi_serdev_register_device()
734 	if (!has_acpi_companion(ctrl->host))  in acpi_serdev_register_devices()
735 		return -ENODEV;  in acpi_serdev_register_devices()
743 	ret = acpi_quirk_skip_serdev_enumeration(ctrl->host, &skip);  in acpi_serdev_register_devices()
753 		dev_warn(&ctrl->dev, "failed to enumerate serdev slaves\n");  in acpi_serdev_register_devices()
755 	if (!ctrl->serdev)  in acpi_serdev_register_devices()
756 		return -ENODEV;  in acpi_serdev_register_devices()
763 	return -ENODEV;  in acpi_serdev_register_devices()
768  * serdev_controller_add() - Add an serdev controller
780 		return -EAGAIN;  in serdev_controller_add()
782 	ret = device_add(&ctrl->dev);  in serdev_controller_add()
786 	pm_runtime_enable(&ctrl->dev);  in serdev_controller_add()
791 		dev_dbg(&ctrl->dev, "no devices registered: of:%pe acpi:%pe\n",  in serdev_controller_add()
793 		ret = -ENODEV;  in serdev_controller_add()
797 	dev_dbg(&ctrl->dev, "serdev%d registered: dev:%p\n",  in serdev_controller_add()
798 		ctrl->nr, &ctrl->dev);  in serdev_controller_add()
802 	pm_runtime_disable(&ctrl->dev);  in serdev_controller_add()
803 	device_del(&ctrl->dev);  in serdev_controller_add()
812 	if (dev->type == &serdev_device_type)  in serdev_remove_device()
829 	device_for_each_child(&ctrl->dev, NULL, serdev_remove_device);  in serdev_controller_remove()
830 	pm_runtime_disable(&ctrl->dev);  in serdev_controller_remove()
831 	device_del(&ctrl->dev);  in serdev_controller_remove()
836  * __serdev_device_driver_register() - Register client driver with serdev core
837  * @sdrv:	client driver to be associated with client-device.
841  * It is typically called from the driver's module-init function.
845 	sdrv->driver.bus = &serdev_bus_type;  in __serdev_device_driver_register()
846 	sdrv->driver.owner = owner;  in __serdev_device_driver_register()
849         sdrv->driver.probe_type = PROBE_PREFER_ASYNCHRONOUS;  in __serdev_device_driver_register()
851 	return driver_register(&sdrv->driver);  in __serdev_device_driver_register()