1 // SPDX-License-Identifier: GPL-2.0
3  * Wifi Frequency Band Manage Interface
54 		return -EINVAL;  in wbrf_record()
56 	for (i = 0; i < ARRAY_SIZE(in->band_list); i++) {  in wbrf_record()
57 		if (in->band_list[i].start && in->band_list[i].end)  in wbrf_record()
63 	 * the caller is required to be equal to the number of  in wbrf_record()
66 	if (num_of_ranges != in->num_of_ranges)  in wbrf_record()
67 		return -EINVAL;  in wbrf_record()
70 	 * Every input frequency band comes with two end points(start/end)  in wbrf_record()
79 		return -ENOMEM;  in wbrf_record()
85 	/* save the number of ranges*/  in wbrf_record()
94 	for (i = 0; i < ARRAY_SIZE(in->band_list); i++) {  in wbrf_record()
95 		if (!in->band_list[i].start || !in->band_list[i].end)  in wbrf_record()
99 		tmp[arg_idx++].integer.value = in->band_list[i].start;  in wbrf_record()
101 		tmp[arg_idx++].integer.value = in->band_list[i].end;  in wbrf_record()
104 	obj = acpi_evaluate_dsm(adev->handle, &wifi_acpi_dsm_guid,  in wbrf_record()
108 		return -EINVAL;  in wbrf_record()
110 	if (obj->type != ACPI_TYPE_INTEGER) {  in wbrf_record()
111 		ret = -EINVAL;  in wbrf_record()
112 		goto out;  in wbrf_record()
115 	ret = obj->integer.value;  in wbrf_record()
117 		ret = -EINVAL;  in wbrf_record()
119 out:  in wbrf_record()
127  * acpi_amd_wbrf_add_remove - add or remove the frequency band the device is using
130  * @action: remove or add the frequency band into bios
131  * @in: input structure containing the frequency band the device is using
133  * Broadcast to other consumers the frequency band the device starts
142  * 0 for success add/remove wifi frequency band.
152 		return -ENODEV;  in acpi_amd_wbrf_add_remove()
165  * acpi_amd_wbrf_supported_producer - determine if the WBRF can be enabled
184 	return acpi_check_dsm(adev->handle, &wifi_acpi_dsm_guid,  in acpi_amd_wbrf_supported_producer()
190  * acpi_amd_wbrf_supported_consumer - determine if the WBRF can be enabled
209 	return acpi_check_dsm(adev->handle, &wifi_acpi_dsm_guid,  in acpi_amd_wbrf_supported_consumer()
215  * amd_wbrf_retrieve_freq_band - retrieve current active frequency bands
218  * @out: output structure containing all the active frequency bands
222  * proper actions if any of the frequency band may cause RFI with its
223  * own frequency band used.
226  * 0 for getting wifi freq band successfully.
229 int amd_wbrf_retrieve_freq_band(struct device *dev, struct wbrf_ranges_in_out *out)  in amd_wbrf_retrieve_freq_band()  argument
239 		return -ENODEV;  in amd_wbrf_retrieve_freq_band()
245 	obj = acpi_evaluate_dsm(adev->handle, &wifi_acpi_dsm_guid,  in amd_wbrf_retrieve_freq_band()
248 		return -EINVAL;  in amd_wbrf_retrieve_freq_band()
252 	 * number_of_entries(1 DWORD):       Number of entries  in amd_wbrf_retrieve_freq_band()
253 	 * start_freq of 1st entry(1 QWORD): Start frequency of the 1st entry  in amd_wbrf_retrieve_freq_band()
254 	 * end_freq of 1st entry(1 QWORD):   End frequency of the 1st entry  in amd_wbrf_retrieve_freq_band()
257 	 * start_freq of the last entry(1 QWORD)  in amd_wbrf_retrieve_freq_band()
258 	 * end_freq of the last entry(1 QWORD)  in amd_wbrf_retrieve_freq_band()
260 	 * Thus the buffer length is determined by the number of entries.  in amd_wbrf_retrieve_freq_band()
261 	 * - For zero entry scenario, the buffer length will be 4 bytes.  in amd_wbrf_retrieve_freq_band()
262 	 * - For one entry scenario, the buffer length will be 20 bytes.  in amd_wbrf_retrieve_freq_band()
264 	if (obj->buffer.length > sizeof(acpi_out) || obj->buffer.length < 4) {  in amd_wbrf_retrieve_freq_band()
266 		ret = -EINVAL;  in amd_wbrf_retrieve_freq_band()
267 		goto out;  in amd_wbrf_retrieve_freq_band()
269 	memcpy(&acpi_out, obj->buffer.pointer, obj->buffer.length);  in amd_wbrf_retrieve_freq_band()
271 	out->num_of_ranges = acpi_out.num_of_ranges;  in amd_wbrf_retrieve_freq_band()
272 	memcpy(out->band_list, acpi_out.band_list, sizeof(acpi_out.band_list));  in amd_wbrf_retrieve_freq_band()
274 out:  in amd_wbrf_retrieve_freq_band()
281  * amd_wbrf_register_notifier - register for notifications of frequency
282  *                                   band update
287  * notified on the frequency band updates from other producers.
300  * amd_wbrf_unregister_notifier - unregister for notifications of
301  *                                     frequency band update
306  * the frequency band updates from other producers. Usually, this should