1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
9  * Copyright (C) 2013, 2014  Guenter Roeck <linux@roeck-us.net>
59 #define I8K_FAN_RPM_THRESHOLD	1000
72 #define DELL_SMM_WMI_GUID	"F1DDEE52-063C-4784-A11E-8A06684B9B01"
81 	unsigned int ecx;  member
191 		return -EBUSY;  in i8k_smm_func()
197 		       "+a" (regs->eax),  in i8k_smm_func()
198 		       "+b" (regs->ebx),  in i8k_smm_func()
199 		       "+c" (regs->ecx),  in i8k_smm_func()
200 		       "+d" (regs->edx),  in i8k_smm_func()
201 		       "+S" (regs->esi),  in i8k_smm_func()
202 		       "+D" (regs->edi));  in i8k_smm_func()
205 		return -EINVAL;  in i8k_smm_func()
237 		return -ENODATA;  in wmi_parse_register()
241 		return -ENOMSG;  in wmi_parse_register()
244 		return -ENODATA;  in wmi_parse_register()
255 		&regs->eax,  in wmi_parse_response()
256 		&regs->ebx,  in wmi_parse_response()
257 		&regs->ecx,  in wmi_parse_response()
258 		&regs->edx  in wmi_parse_response()
266 			return -ENODATA;  in wmi_parse_response()
268 		ret = wmi_parse_register(buffer + offset, length - offset, registers[i]);  in wmi_parse_response()
276 		return -ENOMSG;  in wmi_parse_response()
286 		sizeof(regs->eax),  in wmi_smm_call()
287 		regs->eax,  in wmi_smm_call()
288 		sizeof(regs->ebx),  in wmi_smm_call()
289 		regs->ebx,  in wmi_smm_call()
290 		sizeof(regs->ecx),  in wmi_smm_call()
291 		regs->ecx,  in wmi_smm_call()
292 		sizeof(regs->edx),  in wmi_smm_call()
293 		regs->edx  in wmi_smm_call()
305 		return -EIO;  in wmi_smm_call()
309 		return -ENODATA;  in wmi_smm_call()
311 	if (obj->type != ACPI_TYPE_BUFFER) {  in wmi_smm_call()
312 		ret = -ENOMSG;  in wmi_smm_call()
317 	ret = wmi_parse_response(obj->buffer.pointer, obj->buffer.length, regs);  in wmi_smm_call()
327 	unsigned int eax = regs->eax;  in dell_smm_call()
328 	unsigned int ebx = regs->ebx;  in dell_smm_call()
334 	ret = ops->smm_call(ops->smm_dev, regs);  in dell_smm_call()
338 		 eax, ebx, regs->eax & 0xffff, ret, duration);  in dell_smm_call()
346 	if ((regs->eax & 0xffff) == 0xffff || regs->eax == eax)  in dell_smm_call()
347 		return -EINVAL;  in dell_smm_call()
363 		return -EINVAL;  in i8k_get_fan_status()
365 	return dell_smm_call(data->ops, &regs) ? : regs.eax & 0xff;  in i8k_get_fan_status()
379 		return -EINVAL;  in i8k_get_fan_speed()
381 	return dell_smm_call(data->ops, &regs) ? : (regs.eax & 0xffff) * data->i8k_fan_mult;  in i8k_get_fan_speed()
395 		return -EINVAL;  in _i8k_get_fan_type()
397 	return dell_smm_call(data->ops, &regs) ? : regs.eax & 0xff;  in _i8k_get_fan_type()
403 	if (data->fan_type[fan] == INT_MIN)  in i8k_get_fan_type()
404 		data->fan_type[fan] = _i8k_get_fan_type(data, fan);  in i8k_get_fan_type()
406 	return data->fan_type[fan];  in i8k_get_fan_type()
420 		return -EINVAL;  in i8k_get_fan_nominal_speed()
422 	return dell_smm_call(data->ops, &regs) ? : (regs.eax & 0xffff);  in i8k_get_fan_nominal_speed()
433 		return -EINVAL;  in i8k_enable_fan_auto_mode()
436 	return dell_smm_call(data->ops, &regs);  in i8k_enable_fan_auto_mode()
447 		return -EINVAL;  in i8k_set_fan()
449 	speed = (speed < 0) ? 0 : ((speed > data->i8k_fan_max) ? data->i8k_fan_max : speed);  in i8k_set_fan()
452 	return dell_smm_call(data->ops, &regs);  in i8k_set_fan()
462 	return dell_smm_call(data->ops, &regs) ? : regs.eax & 0xff;  in i8k_get_temp_type()
475 	return dell_smm_call(data->ops, &regs) ? : regs.eax & 0xff;  in _i8k_get_temp()
486 	 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees  in i8k_get_temp()
494 	 * Return -ENODATA for all invalid temperatures.  in i8k_get_temp()
502 		return -ENODATA;  in i8k_get_temp()
516 	return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;  in dell_smm_get_signature()
529 	rc = dell_smm_call(data->ops, &regs);  in i8k_get_fn_status()
553 	rc = dell_smm_call(data->ops, &regs);  in i8k_get_power_status()
572 		return -EINVAL;  in i8k_ioctl()
576 		if (!isdigit(data->bios_version[0]) || !isdigit(data->bios_version[1]) ||  in i8k_ioctl()
577 		    !isdigit(data->bios_version[2]))  in i8k_ioctl()
578 			return -EINVAL;  in i8k_ioctl()
580 		val = (data->bios_version[0] << 16) |  in i8k_ioctl()
581 				(data->bios_version[1] << 8) | data->bios_version[2];  in i8k_ioctl()
584 			return -EFAULT;  in i8k_ioctl()
589 			return -EPERM;  in i8k_ioctl()
591 		if (copy_to_user(argp, data->bios_machineid, sizeof(data->bios_machineid)))  in i8k_ioctl()
592 			return -EFAULT;  in i8k_ioctl()
609 			return -EFAULT;  in i8k_ioctl()
612 			return -EINVAL;  in i8k_ioctl()
619 			return -EFAULT;  in i8k_ioctl()
622 			return -EINVAL;  in i8k_ioctl()
629 			return -EPERM;  in i8k_ioctl()
632 			return -EFAULT;  in i8k_ioctl()
635 			return -EINVAL;  in i8k_ioctl()
638 			return -EFAULT;  in i8k_ioctl()
640 		mutex_lock(&data->i8k_mutex);  in i8k_ioctl()
646 		mutex_unlock(&data->i8k_mutex);  in i8k_ioctl()
650 		return -ENOIOCTLCMD;  in i8k_ioctl()
657 		return -EFAULT;  in i8k_ioctl()
667 	struct dell_smm_data *data = seq->private;  in i8k_proc_show()
680 		ac_power = -1;  in i8k_proc_show()
698 		   data->bios_version,  in i8k_proc_show()
699 		   (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : data->bios_machineid,  in i8k_proc_show()
729 	strscpy(data->bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),  in i8k_init_procfs()
730 		sizeof(data->bios_version));  in i8k_init_procfs()
731 	strscpy(data->bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),  in i8k_init_procfs()
732 		sizeof(data->bios_machineid));  in i8k_init_procfs()
749 	struct dell_smm_cooling_data *cdata = dev->devdata;  in dell_smm_get_max_state()
751 	*state = cdata->data->i8k_fan_max;  in dell_smm_get_max_state()
758 	struct dell_smm_cooling_data *cdata = dev->devdata;  in dell_smm_get_cur_state()
761 	ret = i8k_get_fan_status(cdata->data, cdata->fan_num);  in dell_smm_get_cur_state()
772 	struct dell_smm_cooling_data *cdata = dev->devdata;  in dell_smm_set_cur_state()
773 	struct dell_smm_data *data = cdata->data;  in dell_smm_set_cur_state()
776 	if (state > data->i8k_fan_max)  in dell_smm_set_cur_state()
777 		return -EINVAL;  in dell_smm_set_cur_state()
779 	mutex_lock(&data->i8k_mutex);  in dell_smm_set_cur_state()
780 	ret = i8k_set_fan(data, cdata->fan_num, (int)state);  in dell_smm_set_cur_state()
781 	mutex_unlock(&data->i8k_mutex);  in dell_smm_set_cur_state()
802 			if (data->temp_type[channel] >= 0 || _i8k_get_temp(data, channel) >= 0)  in dell_smm_is_visible()
807 			if (data->temp_type[channel] >= 0)  in dell_smm_is_visible()
821 			if (data->fan[channel])  in dell_smm_is_visible()
826 			if (data->fan[channel] && !disallow_fan_type_call)  in dell_smm_is_visible()
833 			if (data->fan_nominal_speed[channel])  in dell_smm_is_visible()
847 			if (data->fan[channel])  in dell_smm_is_visible()
857 				 * Thus we can only provide write-only access for now.  in dell_smm_is_visible()
877 	int mult = data->i8k_fan_mult;  in dell_smm_read()
888 			*val = ret * 1000;  in dell_smm_read()
906 			*val = data->fan_nominal_speed[channel][0] * mult;  in dell_smm_read()
910 			*val = data->fan_nominal_speed[channel][data->i8k_fan_max] * mult;  in dell_smm_read()
918 			if (ret > data->i8k_fan_max)  in dell_smm_read()
919 				ret = data->i8k_fan_max;  in dell_smm_read()
921 			*val = data->fan_nominal_speed[channel][ret] * mult;  in dell_smm_read()
935 			*val = clamp_val(ret * data->i8k_pwm_mult, 0, 255);  in dell_smm_read()
946 	return -EOPNOTSUPP;  in dell_smm_read()
963 		type = ARRAY_SIZE(fan_labels) - 1;  in dell_smm_fan_label()
977 			*str = temp_labels[data->temp_type[channel]];  in dell_smm_read_string()
996 	return -EOPNOTSUPP;  in dell_smm_read_string()
1011 			pwm = clamp_val(DIV_ROUND_CLOSEST(val, data->i8k_pwm_mult), 0,  in dell_smm_write()
1012 					data->i8k_fan_max);  in dell_smm_write()
1014 			mutex_lock(&data->i8k_mutex);  in dell_smm_write()
1016 			mutex_unlock(&data->i8k_mutex);  in dell_smm_write()
1024 				return -EINVAL;  in dell_smm_write()
1031 			mutex_lock(&data->i8k_mutex);  in dell_smm_write()
1033 			mutex_unlock(&data->i8k_mutex);  in dell_smm_write()
1047 	return -EOPNOTSUPP;  in dell_smm_write()
1100 	name = kasprintf(GFP_KERNEL, "dell-smm-fan%u", fan_num + 1);  in dell_smm_init_cdev()
1102 		return -ENOMEM;  in dell_smm_init_cdev()
1106 		cdata->fan_num = fan_num;  in dell_smm_init_cdev()
1107 		cdata->data = data;  in dell_smm_init_cdev()
1115 		ret = -ENOMEM;  in dell_smm_init_cdev()
1131 		data->temp_type[i] = i8k_get_temp_type(data, i);  in dell_smm_init_hwmon()
1132 		if (data->temp_type[i] < 0)  in dell_smm_init_hwmon()
1135 		if (data->temp_type[i] >= ARRAY_SIZE(temp_labels))  in dell_smm_init_hwmon()
1136 			data->temp_type[i] = ARRAY_SIZE(temp_labels) - 1;  in dell_smm_init_hwmon()
1140 		data->fan_type[i] = INT_MIN;  in dell_smm_init_hwmon()
1148 		data->fan[i] = true;  in dell_smm_init_hwmon()
1158 		data->fan_nominal_speed[i] = devm_kmalloc_array(dev, data->i8k_fan_max + 1,  in dell_smm_init_hwmon()
1159 								sizeof(*data->fan_nominal_speed[i]),  in dell_smm_init_hwmon()
1161 		if (!data->fan_nominal_speed[i])  in dell_smm_init_hwmon()
1164 		for (state = 0; state <= data->i8k_fan_max; state++) {  in dell_smm_init_hwmon()
1168 				devm_kfree(dev, data->fan_nominal_speed[i]);  in dell_smm_init_hwmon()
1169 				data->fan_nominal_speed[i] = NULL;  in dell_smm_init_hwmon()
1172 			data->fan_nominal_speed[i][state] = err;  in dell_smm_init_hwmon()
1179 				data->i8k_fan_mult = 1;  in dell_smm_init_hwmon()
1195 		return -ENOMEM;  in dell_smm_init_data()
1197 	mutex_init(&data->i8k_mutex);  in dell_smm_init_data()
1200 	data->ops = ops;  in dell_smm_init_data()
1202 	data->i8k_fan_mult = fan_mult ? : I8K_FAN_MULT;  in dell_smm_init_data()
1203 	data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH;  in dell_smm_init_data()
1204 	data->i8k_pwm_mult = DIV_ROUND_UP(255, data->i8k_fan_max);  in dell_smm_init_data()
1530 	ret = dell_smm_init_data(&pdev->dev, &i8k_smm_ops);  in dell_smm_probe()
1534 	ret = dell_smm_init_hwmon(&pdev->dev);  in dell_smm_probe()
1538 	i8k_init_procfs(&pdev->dev);  in dell_smm_probe()
1559 	ops = devm_kzalloc(&wdev->dev, sizeof(*ops), GFP_KERNEL);  in dell_smm_wmi_probe()
1561 		return -ENOMEM;  in dell_smm_wmi_probe()
1563 	ops->smm_call = wmi_smm_call;  in dell_smm_wmi_probe()
1564 	ops->smm_dev = &wdev->dev;  in dell_smm_wmi_probe()
1568 		return -ENODEV;  in dell_smm_wmi_probe()
1570 	ret = dell_smm_init_data(&wdev->dev, ops);  in dell_smm_wmi_probe()
1574 	return dell_smm_init_hwmon(&wdev->dev);  in dell_smm_wmi_probe()
1624 	if (id && id->driver_data) {  in dell_smm_init_dmi()
1625 		config = id->driver_data;  in dell_smm_init_dmi()
1626 		if (!fan_mult && config->fan_mult)  in dell_smm_init_dmi()
1627 			fan_mult = config->fan_mult;  in dell_smm_init_dmi()
1629 		if (!fan_max && config->fan_max)  in dell_smm_init_dmi()
1630 			fan_max = config->fan_max;  in dell_smm_init_dmi()
1634 	if (id && id->driver_data) {  in dell_smm_init_dmi()
1635 		control = id->driver_data;  in dell_smm_init_dmi()
1636 		manual_fan = control->manual_fan;  in dell_smm_init_dmi()
1637 		auto_fan = control->auto_fan;  in dell_smm_init_dmi()
1647 			return -ENODEV;  in dell_smm_legacy_check()
1659 			return -ENODEV;  in dell_smm_legacy_check()