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[94.29.29.31]) by smtp.gmail.com with ESMTPSA id u10sm1074722lfg.240.2021.06.21.14.33.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Jun 2021 14:33:14 -0700 (PDT) From: Dmitry Osipenko To: Zhang Rui , Daniel Lezcano , Amit Kucheria , Jean Delvare , Guenter Roeck Cc: linux-hwmon@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org Subject: [PATCH v4 2/2] hwmon: Support set_trips() of thermal device ops Date: Tue, 22 Jun 2021 00:31:53 +0300 Message-Id: <20210621213153.28247-3-digetx@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210621213153.28247-1-digetx@gmail.com> References: <20210621213153.28247-1-digetx@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org 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. The set_trips() callback is entirely optional. If HWMON sensor doesn't support setting thermal trips, then the callback is a NO-OP. The dummy callback has no effect on the thermal core. The temperature trips are either complement the temperature polling mechanism of thermal core or replace the polling if sensor can set the trips and polling is disabled by a particular device in a device-tree. Signed-off-by: Dmitry Osipenko --- drivers/hwmon/hwmon.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c index fd47ab4e6892..9cb9d814cb88 100644 --- a/drivers/hwmon/hwmon.c +++ b/drivers/hwmon/hwmon.c @@ -153,8 +153,41 @@ 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; + int err; + + if (!chip->ops->write) + return 0; + + for (i = 0; info[i] && info[i]->type != hwmon_temp; i++) + continue; + + if (info[i] && info[i]->config[tdata->index] & HWMON_T_MIN) { + err = chip->ops->write(tdata->dev, hwmon_temp, + hwmon_temp_min, tdata->index, low); + if (err && err != -EOPNOTSUPP) + return err; + } + + if (info[i] && info[i]->config[tdata->index] & HWMON_T_MAX) { + err = chip->ops->write(tdata->dev, hwmon_temp, + hwmon_temp_max, tdata->index, high); + if (err && 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)