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.
31 	len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);  in modalias_show()
32 	if (len != -ENODEV)  in modalias_show()
52 	if (rc != -ENODEV)  in serdev_device_uevent()
72 	return dev->type == &serdev_device_type;  in is_serdev_device()
78 	ida_simple_remove(&ctrl_ida, ctrl->nr);  in serdev_ctrl_release()
99  * serdev_device_add() - add a device previously constructed via serdev_device_alloc()
104 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_add()
105 	struct device *parent = serdev->dev.parent;  in serdev_device_add()
108 	dev_set_name(&serdev->dev, "%s-%d", dev_name(parent), serdev->nr);  in serdev_device_add()
111 	if (ctrl->serdev) {  in serdev_device_add()
112 		dev_err(&serdev->dev, "controller busy\n");  in serdev_device_add()
113 		return -EBUSY;  in serdev_device_add()
115 	ctrl->serdev = serdev;  in serdev_device_add()
117 	err = device_add(&serdev->dev);  in serdev_device_add()
119 		dev_err(&serdev->dev, "Can't add %s, status %pe\n",  in serdev_device_add()
120 			dev_name(&serdev->dev), ERR_PTR(err));  in serdev_device_add()
124 	dev_dbg(&serdev->dev, "device %s registered\n", dev_name(&serdev->dev));  in serdev_device_add()
129 	ctrl->serdev = NULL;  in serdev_device_add()
140 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_remove()
142 	device_unregister(&serdev->dev);  in serdev_device_remove()
143 	ctrl->serdev = NULL;  in serdev_device_remove()
149 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_open()
152 	if (!ctrl || !ctrl->ops->open)  in serdev_device_open()
153 		return -EINVAL;  in serdev_device_open()
155 	ret = ctrl->ops->open(ctrl);  in serdev_device_open()
159 	ret = pm_runtime_get_sync(&ctrl->dev);  in serdev_device_open()
161 		pm_runtime_put_noidle(&ctrl->dev);  in serdev_device_open()
168 	if (ctrl->ops->close)  in serdev_device_open()
169 		ctrl->ops->close(ctrl);  in serdev_device_open()
177 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_close()
179 	if (!ctrl || !ctrl->ops->close)  in serdev_device_close()
182 	pm_runtime_put(&ctrl->dev);  in serdev_device_close()
184 	ctrl->ops->close(ctrl);  in serdev_device_close()
200 		return -ENOMEM;  in devm_serdev_device_open()
217 	complete(&serdev->write_comp);  in serdev_device_write_wakeup()
222  * serdev_device_write_buf() - write data asynchronously
229  * Note that any accepted data has only been buffered by the controller; use
234  * the write buffer), or a negative errno on errors.
239 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_write_buf()
241 	if (!ctrl || !ctrl->ops->write_buf)  in serdev_device_write_buf()
242 		return -EINVAL;  in serdev_device_write_buf()
244 	return ctrl->ops->write_buf(ctrl, buf, count);  in serdev_device_write_buf()
249  * serdev_device_write() - write data synchronously
259  * Note that any accepted data has only been buffered by the controller; use
267  * -ETIMEDOUT or -ERESTARTSYS if interrupted before any bytes were written, or
268  * a negative errno on errors.
274 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_write()
278 	if (!ctrl || !ctrl->ops->write_buf || !serdev->ops->write_wakeup)  in serdev_device_write()
279 		return -EINVAL;  in serdev_device_write()
284 	mutex_lock(&serdev->write_lock);  in serdev_device_write()
286 		reinit_completion(&serdev->write_comp);  in serdev_device_write()
288 		ret = ctrl->ops->write_buf(ctrl, buf, count);  in serdev_device_write()
294 		count -= ret;  in serdev_device_write()
299 		timeout = wait_for_completion_interruptible_timeout(&serdev->write_comp,  in serdev_device_write()
302 	mutex_unlock(&serdev->write_lock);  in serdev_device_write()
308 		if (timeout == -ERESTARTSYS)  in serdev_device_write()
309 			return -ERESTARTSYS;  in serdev_device_write()
311 			return -ETIMEDOUT;  in serdev_device_write()
320 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_write_flush()
322 	if (!ctrl || !ctrl->ops->write_flush)  in serdev_device_write_flush()
325 	ctrl->ops->write_flush(ctrl);  in serdev_device_write_flush()
331 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_write_room()
333 	if (!ctrl || !ctrl->ops->write_room)  in serdev_device_write_room()
336 	return serdev->ctrl->ops->write_room(ctrl);  in serdev_device_write_room()
342 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_set_baudrate()
344 	if (!ctrl || !ctrl->ops->set_baudrate)  in serdev_device_set_baudrate()
347 	return ctrl->ops->set_baudrate(ctrl, speed);  in serdev_device_set_baudrate()
354 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_set_flow_control()
356 	if (!ctrl || !ctrl->ops->set_flow_control)  in serdev_device_set_flow_control()
359 	ctrl->ops->set_flow_control(ctrl, enable);  in serdev_device_set_flow_control()
366 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_set_parity()
368 	if (!ctrl || !ctrl->ops->set_parity)  in serdev_device_set_parity()
369 		return -ENOTSUPP;  in serdev_device_set_parity()
371 	return ctrl->ops->set_parity(ctrl, parity);  in serdev_device_set_parity()
377 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_wait_until_sent()
379 	if (!ctrl || !ctrl->ops->wait_until_sent)  in serdev_device_wait_until_sent()
382 	ctrl->ops->wait_until_sent(ctrl, timeout);  in serdev_device_wait_until_sent()
388 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_get_tiocm()
390 	if (!ctrl || !ctrl->ops->get_tiocm)  in serdev_device_get_tiocm()
391 		return -ENOTSUPP;  in serdev_device_get_tiocm()
393 	return ctrl->ops->get_tiocm(ctrl);  in serdev_device_get_tiocm()
399 	struct serdev_controller *ctrl = serdev->ctrl;  in serdev_device_set_tiocm()
401 	if (!ctrl || !ctrl->ops->set_tiocm)  in serdev_device_set_tiocm()
402 		return -ENOTSUPP;  in serdev_device_set_tiocm()
404 	return ctrl->ops->set_tiocm(ctrl, set, clear);  in serdev_device_set_tiocm()
410 	const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);  in serdev_drv_probe()
417 	ret = sdrv->probe(to_serdev_device(dev));  in serdev_drv_probe()
426 	const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);  in serdev_drv_remove()
427 	if (sdrv->remove)  in serdev_drv_remove()
428 		sdrv->remove(to_serdev_device(dev));  in serdev_drv_remove()
441  * serdev_device_alloc() - Allocate a new serdev device
455 	serdev->ctrl = ctrl;  in serdev_device_alloc()
456 	device_initialize(&serdev->dev);  in serdev_device_alloc()
457 	serdev->dev.parent = &ctrl->dev;  in serdev_device_alloc()
458 	serdev->dev.bus = &serdev_bus_type;  in serdev_device_alloc()
459 	serdev->dev.type = &serdev_device_type;  in serdev_device_alloc()
460 	init_completion(&serdev->write_comp);  in serdev_device_alloc()
461 	mutex_init(&serdev->write_lock);  in serdev_device_alloc()
467  * serdev_controller_alloc() - Allocate a new serdev controller
496 	ctrl->nr = id;  in serdev_controller_alloc()
498 	device_initialize(&ctrl->dev);  in serdev_controller_alloc()
499 	ctrl->dev.type = &serdev_ctrl_type;  in serdev_controller_alloc()
500 	ctrl->dev.bus = &serdev_bus_type;  in serdev_controller_alloc()
501 	ctrl->dev.parent = parent;  in serdev_controller_alloc()
502 	ctrl->dev.of_node = parent->of_node;  in serdev_controller_alloc()
505 	dev_set_name(&ctrl->dev, "serial%d", id);  in serdev_controller_alloc()
507 	pm_runtime_no_callbacks(&ctrl->dev);  in serdev_controller_alloc()
508 	pm_suspend_ignore_children(&ctrl->dev, true);  in serdev_controller_alloc()
510 	dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id);  in serdev_controller_alloc()
527 	for_each_available_child_of_node(ctrl->dev.of_node, node) {  in of_serdev_register_devices()
531 		dev_dbg(&ctrl->dev, "adding child %pOF\n", node);  in of_serdev_register_devices()
537 		serdev->dev.of_node = node;  in of_serdev_register_devices()
541 			dev_err(&serdev->dev,  in of_serdev_register_devices()
549 		return -ENODEV;  in of_serdev_register_devices()
566  * serdev_acpi_get_uart_resource - Gets UARTSerialBus resource if type matches
580 	if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)  in serdev_acpi_get_uart_resource()
583 	sb = &ares->data.uart_serial_bus;  in serdev_acpi_get_uart_resource()
584 	if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_UART)  in serdev_acpi_get_uart_resource()
601 	if (lookup->index != -1 && lookup->n++ != lookup->index)  in acpi_serdev_parse_resource()
604 	status = acpi_get_handle(lookup->device_handle,  in acpi_serdev_parse_resource()
605 				 sb->resource_source.string_ptr,  in acpi_serdev_parse_resource()
606 				 &lookup->controller_handle);  in acpi_serdev_parse_resource()
624 	lookup->device_handle = acpi_device_handle(adev);  in acpi_serdev_do_lookup()
625 	lookup->controller_handle = NULL;  in acpi_serdev_do_lookup()
626 	lookup->n = 0;  in acpi_serdev_do_lookup()
634 		return -EINVAL;  in acpi_serdev_do_lookup()
645 	if (acpi_bus_get_status(adev) || !adev->status.present)  in acpi_serdev_check_resources()
646 		return -EINVAL;  in acpi_serdev_check_resources()
649 	lookup.index = -1;	// we only care for the last device  in acpi_serdev_check_resources()
662 		acpi_get_parent(adev->handle, &lookup.controller_handle);  in acpi_serdev_check_resources()
665 	if (ACPI_HANDLE(ctrl->dev.parent) != lookup.controller_handle)  in acpi_serdev_check_resources()
666 		return -ENODEV;  in acpi_serdev_check_resources()
679 		dev_err(&ctrl->dev, "failed to allocate serdev device for %s\n",  in acpi_serdev_register_device()
680 			dev_name(&adev->dev));  in acpi_serdev_register_device()
684 	ACPI_COMPANION_SET(&serdev->dev, adev);  in acpi_serdev_register_device()
689 		dev_err(&serdev->dev,  in acpi_serdev_register_device()
731 	if (!has_acpi_companion(ctrl->dev.parent))  in acpi_serdev_register_devices()
732 		return -ENODEV;  in acpi_serdev_register_devices()
738 		dev_warn(&ctrl->dev, "failed to enumerate serdev slaves\n");  in acpi_serdev_register_devices()
740 	if (!ctrl->serdev)  in acpi_serdev_register_devices()
741 		return -ENODEV;  in acpi_serdev_register_devices()
748 	return -ENODEV;  in acpi_serdev_register_devices()
753  * serdev_controller_add() - Add an serdev controller
765 		return -EAGAIN;  in serdev_controller_add()
767 	ret = device_add(&ctrl->dev);  in serdev_controller_add()
771 	pm_runtime_enable(&ctrl->dev);  in serdev_controller_add()
776 		dev_dbg(&ctrl->dev, "no devices registered: of:%pe acpi:%pe\n",  in serdev_controller_add()
778 		ret = -ENODEV;  in serdev_controller_add()
782 	dev_dbg(&ctrl->dev, "serdev%d registered: dev:%p\n",  in serdev_controller_add()
783 		ctrl->nr, &ctrl->dev);  in serdev_controller_add()
787 	pm_runtime_disable(&ctrl->dev);  in serdev_controller_add()
788 	device_del(&ctrl->dev);  in serdev_controller_add()
797 	if (dev->type == &serdev_device_type)  in serdev_remove_device()
814 	device_for_each_child(&ctrl->dev, NULL, serdev_remove_device);  in serdev_controller_remove()
815 	pm_runtime_disable(&ctrl->dev);  in serdev_controller_remove()
816 	device_del(&ctrl->dev);  in serdev_controller_remove()
821  * __serdev_device_driver_register() - Register client driver with serdev core
822  * @sdrv:	client driver to be associated with client-device.
826  * It is typically called from the driver's module-init function.
830 	sdrv->driver.bus = &serdev_bus_type;  in __serdev_device_driver_register()
831 	sdrv->driver.owner = owner;  in __serdev_device_driver_register()
834         sdrv->driver.probe_type = PROBE_PREFER_ASYNCHRONOUS;  in __serdev_device_driver_register()
836 	return driver_register(&sdrv->driver);  in __serdev_device_driver_register()