1 // SPDX-License-Identifier: GPL-2.0-only
10  *  Copyright (C) 2005-2014 Dell Inc.
23 #include "dell-smbios.h"
76 	{0x0000, 19, -1}, /* diagnostics */
77 	/* handled by kernel: dell-laptop */
122 	/* handled by kernel: dell-laptop */
138 	case -1: /* Completed with error */  in dell_smbios_error()
139 		return -EIO;  in dell_smbios_error()
140 	case -2: /* Function not supported */  in dell_smbios_error()
141 		return -ENXIO;  in dell_smbios_error()
143 		return -EINVAL;  in dell_smbios_error()
154 		return -ENOMEM;  in dell_smbios_register_device()
156 	priv->device = d;  in dell_smbios_register_device()
157 	priv->call_fn = call_fn;  in dell_smbios_register_device()
159 	list_add_tail(&priv->list, &smbios_device_list);  in dell_smbios_register_device()
161 	dev_dbg(d, "Added device: %s\n", d->driver->name);  in dell_smbios_register_device()
172 		if (priv->device == d) {  in dell_smbios_unregister_device()
173 			list_del(&priv->list);  in dell_smbios_unregister_device()
179 	dev_dbg(d, "Remove device: %s\n", d->driver->name);  in dell_smbios_unregister_device()
190 	if (buffer->cmd_class > 30) {  in dell_smbios_call_filter()
191 		dev_dbg(d, "class too big: %u\n", buffer->cmd_class);  in dell_smbios_call_filter()
192 		return -EINVAL;  in dell_smbios_call_filter()
196 	if (!(da_supported_commands & (1 << buffer->cmd_class))) {  in dell_smbios_call_filter()
199 		return -EINVAL;  in dell_smbios_call_filter()
204 		if (buffer->cmd_class != call_blacklist[i].cmd_class)  in dell_smbios_call_filter()
206 		if (buffer->cmd_select != call_blacklist[i].cmd_select &&  in dell_smbios_call_filter()
207 		    call_blacklist[i].cmd_select != -1)  in dell_smbios_call_filter()
210 			buffer->cmd_class, buffer->cmd_select);  in dell_smbios_call_filter()
211 		return -EINVAL;  in dell_smbios_call_filter()
216 	if ((buffer->cmd_class == CLASS_TOKEN_READ ||  in dell_smbios_call_filter()
217 	     buffer->cmd_class == CLASS_TOKEN_WRITE) &&  in dell_smbios_call_filter()
218 	     buffer->cmd_select < 3) {  in dell_smbios_call_filter()
222 			return -EINVAL;  in dell_smbios_call_filter()
227 			if (da_tokens[i].location != buffer->input[0])  in dell_smbios_call_filter()
236 				buffer->input[0]);  in dell_smbios_call_filter()
237 			return -EINVAL;  in dell_smbios_call_filter()
246 				return -EINVAL;  in dell_smbios_call_filter()
266 		if (buffer->cmd_class != call_whitelist[i].cmd_class)  in dell_smbios_call_filter()
268 		if (buffer->cmd_select != call_whitelist[i].cmd_select)  in dell_smbios_call_filter()
273 			buffer->cmd_class, buffer->cmd_select);  in dell_smbios_call_filter()
278 			buffer->cmd_class, buffer->cmd_select);  in dell_smbios_call_filter()
285 			buffer->cmd_class, buffer->cmd_select);  in dell_smbios_call_filter()
289 	return -EACCES;  in dell_smbios_call_filter()
302 		if (!selected_dev || priv->device->id >= selected_dev->id) {  in dell_smbios_call()
303 			dev_dbg(priv->device, "Trying device ID: %d\n",  in dell_smbios_call()
304 				priv->device->id);  in dell_smbios_call()
305 			call_fn = priv->call_fn;  in dell_smbios_call()
306 			selected_dev = priv->device;  in dell_smbios_call()
311 		ret = -ENODEV;  in dell_smbios_call()
312 		pr_err("No dell-smbios drivers are loaded\n");  in dell_smbios_call()
328 	buffer->input[0] = arg0;  in dell_fill_request()
329 	buffer->input[1] = arg1;  in dell_fill_request()
330 	buffer->input[2] = arg2;  in dell_fill_request()
331 	buffer->input[3] = arg3;  in dell_fill_request()
340 	buffer->cmd_class = class;  in dell_send_request()
341 	buffer->cmd_select = select;  in dell_send_request()
345 	return dell_smbios_error(buffer->output[0]);  in dell_send_request()
397 	int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;  in parse_da_table()
407 	if (dm->length < 17)  in parse_da_table()
410 	da_supported_commands = table->supportedCmds;  in parse_da_table()
420 	memcpy(da_tokens+da_num_tokens, table->tokens,  in parse_da_table()
449 	switch (dm->type) {  in find_tokens()
450 	case 0xd4: /* Indexed IO */  in find_tokens()
466 		return -EPERM;  in location_show()
468 	return sysfs_emit(buf, "%08x", data->token->location);  in location_show()
477 		return -EPERM;  in value_show()
479 	return sysfs_emit(buf, "%08x", data->token->value);  in value_show()
488 		.name = "dell-smbios",
501 		return -ENOMEM;  in build_tokens_sysfs()
543 	ret = sysfs_create_group(&dev->dev.kobj, &smbios_attribute_group);  in build_tokens_sysfs()
549 	while (i--) {  in build_tokens_sysfs()
557 	return -ENOMEM;  in build_tokens_sysfs()
564 	sysfs_remove_group(&pdev->dev.kobj,  in free_group()
581 		pr_err("Unable to run on non-Dell system\n");  in dell_smbios_init()
582 		return -ENODEV;  in dell_smbios_init()
591 	platform_device = platform_device_alloc("dell-smbios", 0);  in dell_smbios_init()
593 		ret = -ENOMEM;  in dell_smbios_init()
600 	/* register backends */  in dell_smbios_init()
608 		pr_err("No SMBIOS backends available (wmi: %d, smm: %d)\n",  in dell_smbios_init()
610 		ret = -ENODEV;  in dell_smbios_init()
616 		zero_duplicates(&platform_device->dev);  in dell_smbios_init()