drivers/hwmon/nsa320-hwmon.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  * drivers/hwmon/nsa320-hwmon.c
8  * Copyright (C) 2016 Adam Baker <linux@baker-net.org.uk>
18 #include <linux/hwmon-sysfs.h>
29  * The Zyxel hwmon MCU is a Holtek HT46R065 that is factory programmed
72 	mutex_lock(&hwmon->update_lock);  in nsa320_hwmon_update()
74 	mcu_data = hwmon->mcu_data;  in nsa320_hwmon_update()
76 	if (time_after(jiffies, hwmon->last_updated + HZ) || mcu_data == 0) {  in nsa320_hwmon_update()
77 		gpiod_set_value(hwmon->act, 1);  in nsa320_hwmon_update()
82 			gpiod_set_value(hwmon->clk, 0);  in nsa320_hwmon_update()
84 			gpiod_set_value(hwmon->clk, 1);  in nsa320_hwmon_update()
86 			if (gpiod_get_value(hwmon->data))  in nsa320_hwmon_update()
90 		gpiod_set_value(hwmon->act, 0);  in nsa320_hwmon_update()
95 			mcu_data = -EIO;  in nsa320_hwmon_update()
97 			hwmon->mcu_data = mcu_data;  in nsa320_hwmon_update()
98 			hwmon->last_updated = jiffies;  in nsa320_hwmon_update()
102 	mutex_unlock(&hwmon->update_lock);  in nsa320_hwmon_update()
110 	int channel = to_sensor_dev_attr(attr)->index;  in label_show()
153 	{ .compatible = "zyxel,nsa320-mcu", },
162 	hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);  in nsa320_hwmon_probe()
164 		return -ENOMEM;  in nsa320_hwmon_probe()
167 	hwmon->act = devm_gpiod_get(&pdev->dev, "act", GPIOD_OUT_LOW);  in nsa320_hwmon_probe()
168 	if (IS_ERR(hwmon->act))  in nsa320_hwmon_probe()
169 		return PTR_ERR(hwmon->act);  in nsa320_hwmon_probe()
171 	hwmon->clk = devm_gpiod_get(&pdev->dev, "clk", GPIOD_OUT_HIGH);  in nsa320_hwmon_probe()
172 	if (IS_ERR(hwmon->clk))  in nsa320_hwmon_probe()
173 		return PTR_ERR(hwmon->clk);  in nsa320_hwmon_probe()
175 	hwmon->data = devm_gpiod_get(&pdev->dev, "data", GPIOD_IN);  in nsa320_hwmon_probe()
176 	if (IS_ERR(hwmon->data))  in nsa320_hwmon_probe()
177 		return PTR_ERR(hwmon->data);  in nsa320_hwmon_probe()
179 	mutex_init(&hwmon->update_lock);  in nsa320_hwmon_probe()
181 	classdev = devm_hwmon_device_register_with_groups(&pdev->dev,  in nsa320_hwmon_probe()
193 		.name = "nsa320-hwmon",
202 MODULE_AUTHOR("Adam Baker <linux@baker-net.org.uk>");
205 MODULE_ALIAS("platform:nsa320-hwmon");