--- /dev/null
+/*
+ * OMAP thermal driver interface
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ * Contact:
+ * Eduardo Valentin <eduardo.valentin@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+#include <linux/thermal.h>
+#include <linux/cpumask.h>
+#include <linux/cpu_cooling.h>
+#include <linux/of.h>
+
+#include "ti-thermal.h"
+#include "ti-bandgap.h"
+
+/* common data structures */
+struct ti_thermal_data {
+ struct thermal_zone_device *ti_thermal;
+ struct thermal_zone_device *pcb_tz;
+ struct thermal_cooling_device *cool_dev;
+ struct ti_bandgap *bgp;
+ enum thermal_device_mode mode;
+ struct work_struct thermal_wq;
+ int sensor_id;
+ bool our_zone;
+};
+
+static void ti_thermal_work(struct work_struct *work)
+{
+ struct ti_thermal_data *data = container_of(work,
+ struct ti_thermal_data, thermal_wq);
+
+ thermal_zone_device_update(data->ti_thermal);
+
+ dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
+ data->ti_thermal->type);
+}
+
+/**
+ * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
+ * @t: omap sensor temperature
+ * @s: omap sensor slope value
+ * @c: omap sensor const value
+ */
+static inline int ti_thermal_hotspot_temperature(int t, int s, int c)
+{
+ int delta = t * s / 1000 + c;
+
+ if (delta < 0)
+ delta = 0;
+
+ return t + delta;
+}
+
+/* thermal zone ops */
+/* Get temperature callback function for thermal zone*/
+static inline int __ti_thermal_get_temp(void *devdata, long *temp)
+{
+ struct thermal_zone_device *pcb_tz = NULL;
+ struct ti_thermal_data *data = devdata;
+ struct ti_bandgap *bgp;
+ const struct ti_temp_sensor *s;
+ int ret, tmp, slope, constant;
+ unsigned long pcb_temp;
+
+ if (!data)
+ return 0;
+
+ bgp = data->bgp;
+ s = &bgp->conf->sensors[data->sensor_id];
+
+ ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
+ if (ret)
+ return ret;
+
+ /* Default constants */
+ slope = s->slope;
+ constant = s->constant;
+
+ pcb_tz = data->pcb_tz;
+ /* In case pcb zone is available, use the extrapolation rule with it */
+ if (!IS_ERR(pcb_tz)) {
+ ret = thermal_zone_get_temp(pcb_tz, &pcb_temp);
+ if (!ret) {
+ tmp -= pcb_temp; /* got a valid PCB temp */
+ slope = s->slope_pcb;
+ constant = s->constant_pcb;
+ } else {
+ dev_err(bgp->dev,
+ "Failed to read PCB state. Using defaults\n");
+ ret = 0;
+ }
+ }
+ *temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
+
+ return ret;
+}
+
+static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
+ unsigned long *temp)
+{
+ struct ti_thermal_data *data = thermal->devdata;
+
+ return __ti_thermal_get_temp(data, temp);
+}
+
+/* Bind callback functions for thermal zone */
+static int ti_thermal_bind(struct thermal_zone_device *thermal,
+ struct thermal_cooling_device *cdev)
+{
+ struct ti_thermal_data *data = thermal->devdata;
+ int id;
+
+ if (!data || IS_ERR(data))
+ return -ENODEV;
+
+ /* check if this is the cooling device we registered */
+ if (data->cool_dev != cdev)
+ return 0;
+
+ id = data->sensor_id;
+
+ /* Simple thing, two trips, one passive another critical */
+ return thermal_zone_bind_cooling_device(thermal, 0, cdev,
+ /* bind with min and max states defined by cpu_cooling */
+ THERMAL_NO_LIMIT,
+ THERMAL_NO_LIMIT);
+}
+
+/* Unbind callback functions for thermal zone */
+static int ti_thermal_unbind(struct thermal_zone_device *thermal,
+ struct thermal_cooling_device *cdev)
+{
+ struct ti_thermal_data *data = thermal->devdata;
+
+ if (!data || IS_ERR(data))
+ return -ENODEV;
+
+ /* check if this is the cooling device we registered */
+ if (data->cool_dev != cdev)
+ return 0;
+
+ /* Simple thing, two trips, one passive another critical */
+ return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
+}
+
+/* Get mode callback functions for thermal zone */
+static int ti_thermal_get_mode(struct thermal_zone_device *thermal,
+ enum thermal_device_mode *mode)
+{
+ struct ti_thermal_data *data = thermal->devdata;
+
+ if (data)
+ *mode = data->mode;
+
+ return 0;
+}
+
+/* Set mode callback functions for thermal zone */
+static int ti_thermal_set_mode(struct thermal_zone_device *thermal,
+ enum thermal_device_mode mode)
+{
+ struct ti_thermal_data *data = thermal->devdata;
+ struct ti_bandgap *bgp;
+
+ bgp = data->bgp;
+
+ if (!data->ti_thermal) {
+ dev_notice(&thermal->device, "thermal zone not registered\n");
+ return 0;
+ }
+
+ mutex_lock(&data->ti_thermal->lock);
+
+ if (mode == THERMAL_DEVICE_ENABLED)
+ data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
+ else
+ data->ti_thermal->polling_delay = 0;
+
+ mutex_unlock(&data->ti_thermal->lock);
+
+ data->mode = mode;
+ ti_bandgap_write_update_interval(bgp, data->sensor_id,
+ data->ti_thermal->polling_delay);
+ thermal_zone_device_update(data->ti_thermal);
+ dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
+ data->ti_thermal->polling_delay);
+
+ return 0;
+}
+
+/* Get trip type callback functions for thermal zone */
+static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal,
+ int trip, enum thermal_trip_type *type)
+{
+ if (!ti_thermal_is_valid_trip(trip))
+ return -EINVAL;
+
+ if (trip + 1 == OMAP_TRIP_NUMBER)
+ *type = THERMAL_TRIP_CRITICAL;
+ else
+ *type = THERMAL_TRIP_PASSIVE;
+
+ return 0;
+}
+
+/* Get trip temperature callback functions for thermal zone */
+static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
+ int trip, unsigned long *temp)
+{
+ if (!ti_thermal_is_valid_trip(trip))
+ return -EINVAL;
+
+ *temp = ti_thermal_get_trip_value(trip);
+
+ return 0;
+}
+
+static int __ti_thermal_get_trend(void *p, long *trend)
+{
+ struct ti_thermal_data *data = p;
+ struct ti_bandgap *bgp;
+ int id, tr, ret = 0;
+
+ bgp = data->bgp;
+ id = data->sensor_id;
+
+ ret = ti_bandgap_get_trend(bgp, id, &tr);
+ if (ret)
+ return ret;
+
+ *trend = tr;
+
+ return 0;
+}
+
+/* Get the temperature trend callback functions for thermal zone */
+static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
+ int trip, enum thermal_trend *trend)
+{
+ int ret;
+ long tr;
+
+ ret = __ti_thermal_get_trend(thermal->devdata, &tr);
+ if (ret)
+ return ret;
+
+ if (tr > 0)
+ *trend = THERMAL_TREND_RAISING;
+ else if (tr < 0)
+ *trend = THERMAL_TREND_DROPPING;
+ else
+ *trend = THERMAL_TREND_STABLE;
+
+ return 0;
+}
+
+/* Get critical temperature callback functions for thermal zone */
+static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
+ unsigned long *temp)
+{
+ /* shutdown zone */
+ return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
+}
+
+static const struct thermal_zone_of_device_ops ti_of_thermal_ops = {
+ .get_temp = __ti_thermal_get_temp,
+ .get_trend = __ti_thermal_get_trend,
+};
+
+static struct thermal_zone_device_ops ti_thermal_ops = {
+ .get_temp = ti_thermal_get_temp,
+ .get_trend = ti_thermal_get_trend,
+ .bind = ti_thermal_bind,
+ .unbind = ti_thermal_unbind,
+ .get_mode = ti_thermal_get_mode,
+ .set_mode = ti_thermal_set_mode,
+ .get_trip_type = ti_thermal_get_trip_type,
+ .get_trip_temp = ti_thermal_get_trip_temp,
+ .get_crit_temp = ti_thermal_get_crit_temp,
+};
+
+static struct ti_thermal_data
+*ti_thermal_build_data(struct ti_bandgap *bgp, int id)
+{
+ struct ti_thermal_data *data;
+
+ data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ dev_err(bgp->dev, "kzalloc fail\n");
+ return NULL;
+ }
+ data->sensor_id = id;
+ data->bgp = bgp;
+ data->mode = THERMAL_DEVICE_ENABLED;
+ /* pcb_tz will be either valid or PTR_ERR() */
+ data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
+ INIT_WORK(&data->thermal_wq, ti_thermal_work);
+
+ return data;
+}
+
+int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
+ char *domain)
+{
+ struct ti_thermal_data *data;
+
+ data = ti_bandgap_get_sensor_data(bgp, id);
+
+ if (!data || IS_ERR(data))
+ data = ti_thermal_build_data(bgp, id);
+
+ if (!data)
+ return -EINVAL;
+
+ /* in case this is specified by DT */
+ data->ti_thermal = thermal_zone_of_sensor_register(bgp->dev, id,
+ data, &ti_of_thermal_ops);
+ if (IS_ERR(data->ti_thermal)) {
+ /* Create thermal zone */
+ data->ti_thermal = thermal_zone_device_register(domain,
+ OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops,
+ NULL, FAST_TEMP_MONITORING_RATE,
+ FAST_TEMP_MONITORING_RATE);
+ if (IS_ERR(data->ti_thermal)) {
+ dev_err(bgp->dev, "thermal zone device is NULL\n");
+ return PTR_ERR(data->ti_thermal);
+ }
+ data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
+ data->our_zone = true;
+ }
+ ti_bandgap_set_sensor_data(bgp, id, data);
+ ti_bandgap_write_update_interval(bgp, data->sensor_id,
+ data->ti_thermal->polling_delay);
+
+ return 0;
+}
+
+int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
+{
+ struct ti_thermal_data *data;
+
+ data = ti_bandgap_get_sensor_data(bgp, id);
+
+ if (data && data->ti_thermal) {
+ if (data->our_zone)
+ thermal_zone_device_unregister(data->ti_thermal);
+ else
+ thermal_zone_of_sensor_unregister(bgp->dev,
+ data->ti_thermal);
+ }
+
+ return 0;
+}
+
+int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
+{
+ struct ti_thermal_data *data;
+
+ data = ti_bandgap_get_sensor_data(bgp, id);
+
+ schedule_work(&data->thermal_wq);
+
+ return 0;
+}
+
+int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
+{
+ struct ti_thermal_data *data;
+ struct device_node *np = bgp->dev->of_node;
+
+ /*
+ * We are assuming here that if one deploys the zone
+ * using DT, then it must be aware that the cooling device
+ * loading has to happen via cpufreq driver.
+ */
+ if (of_find_property(np, "#thermal-sensor-cells", NULL))
+ return 0;
+
+ data = ti_bandgap_get_sensor_data(bgp, id);
+ if (!data || IS_ERR(data))
+ data = ti_thermal_build_data(bgp, id);
+
+ if (!data)
+ return -EINVAL;
+
+ /* Register cooling device */
+ data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
+ if (IS_ERR(data->cool_dev)) {
+ int ret = PTR_ERR(data->cool_dev);
+
+ if (ret != -EPROBE_DEFER)
+ dev_err(bgp->dev,
+ "Failed to register cpu cooling device %d\n",
+ ret);
+
+ return ret;
+ }
+ ti_bandgap_set_sensor_data(bgp, id, data);
+
+ return 0;
+}
+
+int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
+{
+ struct ti_thermal_data *data;
+
+ data = ti_bandgap_get_sensor_data(bgp, id);
+
+ if (data)
+ cpufreq_cooling_unregister(data->cool_dev);
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff