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[90.63.244.31]) by smtp.gmail.com with ESMTPSA id y10sm8146814wmo.18.2021.08.19.05.30.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Aug 2021 05:30:43 -0700 (PDT) From: Alexandre Bailon To: rui.zhang@intel.com, daniel.lezcano@linaro.org, amitk@kernel.org Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, ben.tseng@mediatek.com, khilman@baylibre.com, Alexandre Bailon Subject: [RFC PATCH 1/2] thermal: provide a way to get thermal sensor from a device tree node Date: Thu, 19 Aug 2021 14:32:14 +0200 Message-Id: <20210819123215.591593-2-abailon@baylibre.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210819123215.591593-1-abailon@baylibre.com> References: <20210819123215.591593-1-abailon@baylibre.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In order to add support of a virtual thermal sensor, add a way to get a sensor using the device tree node and sensor id. Signed-off-by: Alexandre Bailon --- drivers/thermal/thermal_of.c | 43 ++++++++++++++++++++++++++++++++++++ include/linux/thermal.h | 12 ++++++++++ 2 files changed, 55 insertions(+) diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c index 6379f26a335f6..4d3b07ceef41a 100644 --- a/drivers/thermal/thermal_of.c +++ b/drivers/thermal/thermal_of.c @@ -82,6 +82,46 @@ struct __thermal_zone { const struct thermal_zone_of_device_ops *ops; }; + +static LIST_HEAD(thermal_sensors); + +struct thermal_sensor *thermal_of_get_sensor(struct device_node *np, int id) +{ + struct thermal_sensor *sensor; + list_for_each_entry(sensor, &thermal_sensors, node) { + if (sensor->dev->of_node == np && sensor->id == id) { + return sensor; + } + } + + return NULL; +} + +static int thermal_of_register_sensor(struct device *dev, int id, + void *sensor_data, + const struct thermal_zone_of_device_ops *ops) +{ + + struct thermal_sensor *sensor; + + sensor = thermal_of_get_sensor(dev->of_node, id); + if (sensor) + return 0; + + sensor = kzalloc(sizeof(*sensor), GFP_KERNEL); + sensor->dev = dev; + sensor->id = id; + sensor->sensor_data = sensor_data; + sensor->ops = ops; + + list_add(&sensor->node, &thermal_sensors); + + return 0; +} + + + + /*** DT thermal zone device callbacks ***/ static int of_thermal_get_temp(struct thermal_zone_device *tz, @@ -518,6 +558,9 @@ thermal_zone_of_sensor_register(struct device *dev, int sensor_id, void *data, if (!IS_ERR(tzd)) thermal_zone_device_enable(tzd); + /* TODO handle errors */ + thermal_of_register_sensor(dev, id, data, ops); + of_node_put(child); goto exit; } diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 8da5b61070472..3c46b142ebfef 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -104,6 +104,16 @@ struct thermal_cooling_device { struct list_head node; }; +struct thermal_sensor { + struct device *dev; + int id; + + void *sensor_data; + const struct thermal_zone_of_device_ops *ops; + + struct list_head node; +}; + /** * struct thermal_zone_device - structure for a thermal zone * @id: unique id number for each thermal zone @@ -394,6 +404,8 @@ int thermal_zone_get_offset(struct thermal_zone_device *tz); int thermal_zone_device_enable(struct thermal_zone_device *tz); int thermal_zone_device_disable(struct thermal_zone_device *tz); void thermal_zone_device_critical(struct thermal_zone_device *tz); + +struct thermal_sensor *thermal_of_get_sensor(struct device_node *np, int id); #else static inline struct thermal_zone_device *thermal_zone_device_register( const char *type, int trips, int mask, void *devdata, -- 2.31.1