1 // SPDX-License-Identifier: GPL-2.0-or-later
29 #define DRIVER_NAME	"msi-wmi-platform"
31 #define MSI_PLATFORM_GUID	"ABBC0F6E-8EA1-11d1-00A0-C90629100000"
88 	enum msi_wmi_platform_method method;  member
128 	if (obj->type != ACPI_TYPE_BUFFER)  in msi_wmi_platform_parse_buffer()
129 		return -ENOMSG;  in msi_wmi_platform_parse_buffer()
131 	if (obj->buffer.length != length)  in msi_wmi_platform_parse_buffer()
132 		return -EPROTO;  in msi_wmi_platform_parse_buffer()
134 	if (!obj->buffer.pointer[0])  in msi_wmi_platform_parse_buffer()
135 		return -EIO;  in msi_wmi_platform_parse_buffer()
137 	memcpy(output, obj->buffer.pointer, obj->buffer.length);  in msi_wmi_platform_parse_buffer()
143 				  enum msi_wmi_platform_method method, u8 *input,  in msi_wmi_platform_query()  argument
156 		return -EINVAL;  in msi_wmi_platform_query()
159 	 * The ACPI control method responsible for handling the WMI method calls  in msi_wmi_platform_query()
160 	 * is not thread-safe. Because of this we have to do the locking ourself.  in msi_wmi_platform_query()
162 	scoped_guard(mutex, &data->wmi_lock) {  in msi_wmi_platform_query()
163 		status = wmidev_evaluate_method(data->wdev, 0x0, method, &in, &out);  in msi_wmi_platform_query()
165 			return -EIO;  in msi_wmi_platform_query()
170 		return -ENODATA;  in msi_wmi_platform_query()
230 	struct seq_file *seq = fp->private_data;  in msi_wmi_platform_write()
231 	struct msi_wmi_platform_debugfs_data *data = seq->private;  in msi_wmi_platform_write()
237 		return -EINVAL;  in msi_wmi_platform_write()
240 	if (length != data->length)  in msi_wmi_platform_write()
241 		return -EINVAL;  in msi_wmi_platform_write()
247 	down_write(&data->buffer_lock);  in msi_wmi_platform_write()
248 	ret = msi_wmi_platform_query(data->data, data->method, payload, data->length, data->buffer,  in msi_wmi_platform_write()
249 				     data->length);  in msi_wmi_platform_write()
250 	up_write(&data->buffer_lock);  in msi_wmi_platform_write()
260 	struct msi_wmi_platform_debugfs_data *data = seq->private;  in msi_wmi_platform_show()
263 	down_read(&data->buffer_lock);  in msi_wmi_platform_show()
264 	ret = seq_write(seq, data->buffer, data->length);  in msi_wmi_platform_show()
265 	up_read(&data->buffer_lock);  in msi_wmi_platform_show()
272 	struct msi_wmi_platform_debugfs_data *data = inode->i_private;  in msi_wmi_platform_open()
275 	return single_open_size(fp, msi_wmi_platform_show, data, data->length + 1);  in msi_wmi_platform_open()
295 					 const char *name, enum msi_wmi_platform_method method)  in msi_wmi_platform_debugfs_add()  argument
298 	struct dentry *entry;  in msi_wmi_platform_debugfs_add()  local
300 	data = devm_kzalloc(&drvdata->wdev->dev, sizeof(*data), GFP_KERNEL);  in msi_wmi_platform_debugfs_add()
304 	data->data = drvdata;  in msi_wmi_platform_debugfs_add()
305 	data->method = method;  in msi_wmi_platform_debugfs_add()
306 	init_rwsem(&data->buffer_lock);  in msi_wmi_platform_debugfs_add()
311 	data->length = 32;  in msi_wmi_platform_debugfs_add()
313 	entry = debugfs_create_file(name, 0600, dir, data, &msi_wmi_platform_debugfs_fops);  in msi_wmi_platform_debugfs_add()
314 	if (IS_ERR(entry))  in msi_wmi_platform_debugfs_add()
315 		devm_kfree(&drvdata->wdev->dev, data);  in msi_wmi_platform_debugfs_add()
322 	int ret, method;  in msi_wmi_platform_debugfs_init()  local
324 	scnprintf(dir_name, ARRAY_SIZE(dir_name), "%s-%s", DRIVER_NAME, dev_name(&data->wdev->dev));  in msi_wmi_platform_debugfs_init()
330 	ret = devm_add_action_or_reset(&data->wdev->dev, msi_wmi_platform_debugfs_remove, dir);  in msi_wmi_platform_debugfs_init()
334 	for (method = MSI_PLATFORM_GET_PACKAGE; method <= MSI_PLATFORM_GET_WMI; method++)  in msi_wmi_platform_debugfs_init()
335 		msi_wmi_platform_debugfs_add(data, dir, msi_wmi_platform_debugfs_names[method - 1],  in msi_wmi_platform_debugfs_init()
336 					     method);  in msi_wmi_platform_debugfs_init()
343 	hdev = devm_hwmon_device_register_with_info(&data->wdev->dev, "msi_wmi_platform", data,  in msi_wmi_platform_hwmon_init()
363 	dev_dbg(&data->wdev->dev, "EC RAM version %lu.%lu\n",  in msi_wmi_platform_ec_init()
366 	dev_dbg(&data->wdev->dev, "EC firmware version %.28s\n",  in msi_wmi_platform_ec_init()
371 			return -ENODEV;  in msi_wmi_platform_ec_init()
373 		dev_warn(&data->wdev->dev, "Loading on a non-Tigerlake platform\n");  in msi_wmi_platform_ec_init()
390 	dev_dbg(&data->wdev->dev, "WMI interface version %u.%u\n",  in msi_wmi_platform_init()
396 			return -ENODEV;  in msi_wmi_platform_init()
398 		dev_warn(&data->wdev->dev,  in msi_wmi_platform_init()
412 	data = devm_kzalloc(&wdev->dev, sizeof(*data), GFP_KERNEL);  in msi_wmi_platform_probe()
414 		return -ENOMEM;  in msi_wmi_platform_probe()
416 	data->wdev = wdev;  in msi_wmi_platform_probe()
417 	dev_set_drvdata(&wdev->dev, data);  in msi_wmi_platform_probe()
419 	ret = devm_mutex_init(&wdev->dev, &data->wmi_lock);  in msi_wmi_platform_probe()