1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * hwmon interface for the ACPI Fan driver.
16 #include "fan.h"
18 /* Returned when the ACPI fan does not support speed reporting */
22 static struct acpi_fan_fps *acpi_fan_get_current_fps(struct acpi_fan *fan, u64 control)  in acpi_fan_get_current_fps()  argument
26 	for (i = 0; i < fan->fps_count; i++) {  in acpi_fan_get_current_fps()
27 		if (fan->fps[i].control == control)  in acpi_fan_get_current_fps()
28 			return &fan->fps[i];  in acpi_fan_get_current_fps()
37 	const struct acpi_fan *fan = drvdata;  in acpi_fan_hwmon_is_visible()  local
47 			 * When in fine grain control mode, not every fan control value  in acpi_fan_hwmon_is_visible()
48 			 * has an associated fan performance state.  in acpi_fan_hwmon_is_visible()
50 			if (fan->fif.fine_grain_ctrl)  in acpi_fan_hwmon_is_visible()
51 				return 0;  in acpi_fan_hwmon_is_visible()
55 			return 0;  in acpi_fan_hwmon_is_visible()
61 			 * When in fine grain control mode, not every fan control value  in acpi_fan_hwmon_is_visible()
62 			 * has an associated fan performance state.  in acpi_fan_hwmon_is_visible()
64 			if (fan->fif.fine_grain_ctrl)  in acpi_fan_hwmon_is_visible()
65 				return 0;  in acpi_fan_hwmon_is_visible()
68 			 * When all fan performance states contain no valid power data,  in acpi_fan_hwmon_is_visible()
71 			for (i = 0; i < fan->fps_count; i++) {  in acpi_fan_hwmon_is_visible()
72 				if (fan->fps[i].power != FAN_POWER_UNAVAILABLE)  in acpi_fan_hwmon_is_visible()
76 			return 0;  in acpi_fan_hwmon_is_visible()
78 			return 0;  in acpi_fan_hwmon_is_visible()
81 		return 0;  in acpi_fan_hwmon_is_visible()
88 	struct acpi_device *adev = to_acpi_device(dev->parent);  in acpi_fan_hwmon_read()
89 	struct acpi_fan *fan = dev_get_drvdata(dev);  in acpi_fan_hwmon_read()  local
95 	if (ret < 0)  in acpi_fan_hwmon_read()
103 				return -ENODEV;  in acpi_fan_hwmon_read()
106 				return -EOVERFLOW;  in acpi_fan_hwmon_read()
109 			return 0;  in acpi_fan_hwmon_read()
111 			fps = acpi_fan_get_current_fps(fan, fst.control);  in acpi_fan_hwmon_read()
113 				return -EIO;  in acpi_fan_hwmon_read()
115 			if (fps->speed > LONG_MAX)  in acpi_fan_hwmon_read()
116 				return -EOVERFLOW;  in acpi_fan_hwmon_read()
118 			*val = fps->speed;  in acpi_fan_hwmon_read()
119 			return 0;  in acpi_fan_hwmon_read()
121 			return -EOPNOTSUPP;  in acpi_fan_hwmon_read()
126 			fps = acpi_fan_get_current_fps(fan, fst.control);  in acpi_fan_hwmon_read()
128 				return -EIO;  in acpi_fan_hwmon_read()
130 			if (fps->power == FAN_POWER_UNAVAILABLE)  in acpi_fan_hwmon_read()
131 				return -ENODEV;  in acpi_fan_hwmon_read()
133 			if (fps->power > LONG_MAX / MICROWATT_PER_MILLIWATT)  in acpi_fan_hwmon_read()
134 				return -EOVERFLOW;  in acpi_fan_hwmon_read()
136 			*val = fps->power * MICROWATT_PER_MILLIWATT;  in acpi_fan_hwmon_read()
137 			return 0;  in acpi_fan_hwmon_read()
139 			return -EOPNOTSUPP;  in acpi_fan_hwmon_read()
142 		return -EOPNOTSUPP;  in acpi_fan_hwmon_read()
152 	HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_TARGET),
164 	struct acpi_fan *fan = acpi_driver_data(device);  in devm_acpi_fan_create_hwmon()  local
167 	hdev = devm_hwmon_device_register_with_info(&device->dev, "acpi_fan", fan,  in devm_acpi_fan_create_hwmon()