linux-kernel - [PATCH v2 2/2] hwmon: Support set

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Date:   Mon, 21 Jun 2021 00:14:08 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-hwmon@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: [PATCH v2 2/2] hwmon: Support set_trips() of thermal device ops

Support set_trips() callback of thermal device ops. This allows HWMON
device to operatively notify thermal core about temperature changes, which
is very handy to have in a case where HWMON sensor is used by CPU thermal
zone that performs passive cooling and emergency shutdown on overheat.
Thermal core will be able to react faster to temperature changes.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/hwmon/hwmon.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index fd47ab4e6892..e74dc81e650d 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -153,8 +153,40 @@ static int hwmon_thermal_get_temp(void *data, int *temp)
 	return 0;
 }
 
+static int hwmon_thermal_set_trips(void *data, int low, int high)
+{
+	struct hwmon_thermal_data *tdata = data;
+	struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
+	const struct hwmon_chip_info *chip = hwdev->chip;
+	const struct hwmon_channel_info **info = chip->info;
+	unsigned int i;
+
+	if (!chip->ops->write)
+		return 0;
+
+	for (i = 1; info[i] && info[i]->type != hwmon_temp; i++)
+		continue;
+
+	if (info[i] && info[i]->config[tdata->index] & HWMON_T_MIN) {
+		int err = chip->ops->write(tdata->dev, hwmon_temp,
+					   hwmon_temp_min, tdata->index, low);
+		if (err < 0 && err != -EOPNOTSUPP)
+			return err;
+	}
+
+	if (info[i] && info[i]->config[tdata->index] & HWMON_T_MAX) {
+		int err = chip->ops->write(tdata->dev, hwmon_temp,
+					   hwmon_temp_max, tdata->index, high);
+		if (err < 0 && err != -EOPNOTSUPP)
+			return err;
+	}
+
+	return 0;
+}
+
 static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
 	.get_temp = hwmon_thermal_get_temp,
+	.set_trips = hwmon_thermal_set_trips,
 };
 
 static void hwmon_thermal_remove_sensor(void *data)
-- 
2.30.2