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>
26 #include <linux/hwmon-sysfs.h>
123 	unsigned int ecx __packed;
143 	int eax = regs->eax;  in i8k_smm_func()
146 	int ebx = regs->ebx;  in i8k_smm_func()
155 		return -EBUSY;  in i8k_smm_func()
162 		"movl 8(%%rax),%%ecx\n\t"  in i8k_smm_func()
171 		"movl %%ecx,8(%%rax)\n\t"  in i8k_smm_func()
182 		:    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");  in i8k_smm_func()
188 	    "movl 8(%%eax),%%ecx\n\t"  in i8k_smm_func()
197 	    "movl %%ecx,8(%%eax)\n\t"  in i8k_smm_func()
208 	    :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");  in i8k_smm_func()
210 	if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)  in i8k_smm_func()
211 		rc = -EINVAL;  in i8k_smm_func()
218 		(rc ? 0xffff : regs->eax & 0xffff), duration);  in i8k_smm_func()
246 		return -EINVAL;  in i8k_get_fan_status()
260 		return -EINVAL;  in i8k_get_fan_speed()
274 		return -EINVAL;  in _i8k_get_fan_type()
299 		return -EINVAL;  in i8k_get_fan_nominal_speed()
313 		return -EINVAL;  in i8k_enable_fan_auto_mode()
327 		return -EINVAL;  in i8k_set_fan()
364 	 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees  in i8k_get_temp()
372 	 * Return -ENODATA for all invalid temperatures.  in i8k_get_temp()
380 		return -ENODATA;  in i8k_get_temp()
394 	return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;  in i8k_get_dell_signature()
451 		return -EINVAL;  in i8k_ioctl_unlocked()
457 			return -EINVAL;  in i8k_ioctl_unlocked()
465 			return -EPERM;  in i8k_ioctl_unlocked()
485 			return -EFAULT;  in i8k_ioctl_unlocked()
492 			return -EFAULT;  in i8k_ioctl_unlocked()
499 			return -EPERM;  in i8k_ioctl_unlocked()
502 			return -EFAULT;  in i8k_ioctl_unlocked()
505 			return -EFAULT;  in i8k_ioctl_unlocked()
511 		return -EINVAL;  in i8k_ioctl_unlocked()
520 			return -EFAULT;  in i8k_ioctl_unlocked()
525 			return -EFAULT;  in i8k_ioctl_unlocked()
530 			return -EFAULT;  in i8k_ioctl_unlocked()
566 		ac_power = -1;  in i8k_proc_show()
585 		   (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid,  in i8k_proc_show()
645 	int index = to_sensor_dev_attr(devattr)->index;  in i8k_hwmon_temp_label_show()
652 		type = ARRAY_SIZE(labels) - 1;  in i8k_hwmon_temp_label_show()
660 	int index = to_sensor_dev_attr(devattr)->index;  in i8k_hwmon_temp_show()
666 	return sprintf(buf, "%d\n", temp * 1000);  in i8k_hwmon_temp_show()
681 	int index = to_sensor_dev_attr(devattr)->index;  in i8k_hwmon_fan_label_show()
695 		type = (ARRAY_SIZE(labels) - 1);  in i8k_hwmon_fan_label_show()
703 	int index = to_sensor_dev_attr(devattr)->index;  in i8k_hwmon_fan_show()
715 	int index = to_sensor_dev_attr(devattr)->index;  in i8k_hwmon_pwm_show()
720 		return -EIO;  in i8k_hwmon_pwm_show()
728 	int index = to_sensor_dev_attr(attr)->index;  in i8k_hwmon_pwm_store()
741 	return err < 0 ? -EIO : count;  in i8k_hwmon_pwm_store()
753 		return -ENODEV;  in i8k_hwmon_pwm_enable_store()
764 		return -EINVAL;  in i8k_hwmon_pwm_enable_store()
890 	return attr->mode;  in i8k_is_visible()
1222 			return -ENODEV;  in i8k_probe()
1255 			return -ENODEV;  in i8k_probe()
1263 	if (id && id->driver_data) {  in i8k_probe()
1264 		const struct i8k_config_data *conf = id->driver_data;  in i8k_probe()
1265 		if (!fan_mult && conf->fan_mult)  in i8k_probe()
1266 			fan_mult = conf->fan_mult;  in i8k_probe()
1267 		if (!fan_max && conf->fan_max)  in i8k_probe()
1268 			fan_max = conf->fan_max;  in i8k_probe()
1275 	if (fan_control && fan_control->driver_data) {  in i8k_probe()
1276 		const struct i8k_fan_control_data *data = fan_control->driver_data;  in i8k_probe()
1278 		manual_fan = data->manual_fan;  in i8k_probe()
1279 		auto_fan = data->auto_fan;  in i8k_probe()
1310 		return -ENODEV;  in i8k_init()