thermal: Enhance thermal_zone_device_update for events

Added one additional parameter to thermal_zone_device_update() to provide
caller with an optional capability to specify reason.
Currently this event is used by user space governor to trigger different
processing based on event code. Also it saves an additional call to read
temperature when the event is received.
The following events are cuurently defined:
- Unspecified event
- New temperature sample
- Trip point violated
- Trip point changed
- thermal device up and down
- thermal device power capability changed

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

20 files changed, 60 insertions, 30 deletions

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index f4ebe39..35e8fbc 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -520,7 +520,8 @@ static void acpi_thermal_check(void *data)
 	if (!tz->tz_enabled)
 		return;
 
-	thermal_zone_device_update(tz->thermal_zone);
+	thermal_zone_device_update(tz->thermal_zone,
+				   THERMAL_EVENT_UNSPECIFIED);
 }
 
 /* sys I/F for generic thermal sysfs support */
diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
index 460fa67..2acdb0d 100644
--- a/drivers/platform/x86/acerhdf.c
+++ b/drivers/platform/x86/acerhdf.c
@@ -405,7 +405,7 @@ static inline void acerhdf_enable_kernelmode(void)
 	kernelmode = 1;
 
 	thz_dev->polling_delay = interval*1000;
-	thermal_zone_device_update(thz_dev);
+	thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED);
 	pr_notice("kernel mode fan control ON\n");
 }
 
diff --git a/drivers/regulator/max8973-regulator.c b/drivers/regulator/max8973-regulator.c
index 3958f50..e0c747a 100644
--- a/drivers/regulator/max8973-regulator.c
+++ b/drivers/regulator/max8973-regulator.c
@@ -495,7 +495,8 @@ static irqreturn_t max8973_thermal_irq(int irq, void *data)
 {
 	struct max8973_chip *mchip = data;
 
-	thermal_zone_device_update(mchip->tz_device);
+	thermal_zone_device_update(mchip->tz_device,
+				   THERMAL_EVENT_UNSPECIFIED);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/thermal/db8500_thermal.c b/drivers/thermal/db8500_thermal.c
index 652acd8..e776cea 100644
--- a/drivers/thermal/db8500_thermal.c
+++ b/drivers/thermal/db8500_thermal.c
@@ -306,7 +306,7 @@ static void db8500_thermal_work(struct work_struct *work)
 	if (cur_mode == THERMAL_DEVICE_DISABLED)
 		return;
 
-	thermal_zone_device_update(pzone->therm_dev);
+	thermal_zone_device_update(pzone->therm_dev, THERMAL_EVENT_UNSPECIFIED);
 	dev_dbg(&pzone->therm_dev->device, "thermal work finished.\n");
 }
 
diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c
index 97fad8f..f642966 100644
--- a/drivers/thermal/hisi_thermal.c
+++ b/drivers/thermal/hisi_thermal.c
@@ -237,7 +237,8 @@ static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
 		if (!data->sensors[i].tzd)
 			continue;
 
-		thermal_zone_device_update(data->sensors[i].tzd);
+		thermal_zone_device_update(data->sensors[i].tzd,
+					   THERMAL_EVENT_UNSPECIFIED);
 	}
 
 	return IRQ_HANDLED;
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index e473548..06912f0 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -246,7 +246,7 @@ static int imx_set_mode(struct thermal_zone_device *tz,
 	}
 
 	data->mode = mode;
-	thermal_zone_device_update(tz);
+	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 
 	return 0;
 }
@@ -457,7 +457,7 @@ static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
 	dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
 		data->alarm_temp / 1000);
 
-	thermal_zone_device_update(data->tz);
+	thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/thermal/int340x_thermal/int340x_thermal_zone.h b/drivers/thermal/int340x_thermal/int340x_thermal_zone.h
index aaadf72..65116b1 100644
--- a/drivers/thermal/int340x_thermal/int340x_thermal_zone.h
+++ b/drivers/thermal/int340x_thermal/int340x_thermal_zone.h
@@ -62,7 +62,7 @@ static inline void *int340x_thermal_zone_get_priv_data(
 static inline void int340x_thermal_zone_device_update(
 			struct int34x_thermal_zone *tzone)
 {
-	thermal_zone_device_update(tzone->zone);
+	thermal_zone_device_update(tzone->zone, THERMAL_EVENT_UNSPECIFIED);
 }
 
 #endif
diff --git a/drivers/thermal/intel_bxt_pmic_thermal.c b/drivers/thermal/intel_bxt_pmic_thermal.c
index 4ae3e0c..0f19a39 100644
--- a/drivers/thermal/intel_bxt_pmic_thermal.c
+++ b/drivers/thermal/intel_bxt_pmic_thermal.c
@@ -204,7 +204,8 @@ static irqreturn_t pmic_thermal_irq_handler(int irq, void *data)
 			trip = td->maps[i].trip_config[j].trip_num;
 			tzd = thermal_zone_get_zone_by_name(td->maps[i].handle);
 			if (!IS_ERR(tzd))
-				thermal_zone_device_update(tzd);
+				thermal_zone_device_update(tzd,
+						THERMAL_EVENT_UNSPECIFIED);
 
 			/* Clear the appropriate irq */
 			regmap_write(regmap, reg, reg_val & mask);
diff --git a/drivers/thermal/intel_soc_dts_iosf.c b/drivers/thermal/intel_soc_dts_iosf.c
index f72e1db..e0813df 100644
--- a/drivers/thermal/intel_soc_dts_iosf.c
+++ b/drivers/thermal/intel_soc_dts_iosf.c
@@ -391,7 +391,8 @@ void intel_soc_dts_iosf_interrupt_handler(struct intel_soc_dts_sensors *sensors)
 
 		for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 			pr_debug("TZD update for zone %d\n", i);
-			thermal_zone_device_update(sensors->soc_dts[i].tzone);
+			thermal_zone_device_update(sensors->soc_dts[i].tzone,
+						   THERMAL_EVENT_UNSPECIFIED);
 		}
 	} else
 		spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
diff --git a/drivers/thermal/max77620_thermal.c b/drivers/thermal/max77620_thermal.c
index 8d61626..83905ff 100644
--- a/drivers/thermal/max77620_thermal.c
+++ b/drivers/thermal/max77620_thermal.c
@@ -82,7 +82,8 @@ static irqreturn_t max77620_thermal_irq(int irq, void *data)
 	else if (irq == mtherm->irq_tjalarm2)
 		dev_crit(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n");
 
-	thermal_zone_device_update(mtherm->tz_device);
+	thermal_zone_device_update(mtherm->tz_device,
+				   THERMAL_EVENT_UNSPECIFIED);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index ab6e526..d04ec3b 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -286,7 +286,7 @@ static int of_thermal_set_mode(struct thermal_zone_device *tz,
 	mutex_unlock(&tz->lock);
 
 	data->mode = mode;
-	thermal_zone_device_update(tz);
+	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 
 	return 0;
 }
diff --git a/drivers/thermal/qcom-spmi-temp-alarm.c b/drivers/thermal/qcom-spmi-temp-alarm.c
index f8a3c60..819c6d5 100644
--- a/drivers/thermal/qcom-spmi-temp-alarm.c
+++ b/drivers/thermal/qcom-spmi-temp-alarm.c
@@ -150,7 +150,7 @@ static irqreturn_t qpnp_tm_isr(int irq, void *data)
 {
 	struct qpnp_tm_chip *chip = data;
 
-	thermal_zone_device_update(chip->tz_dev);
+	thermal_zone_device_update(chip->tz_dev, THERMAL_EVENT_UNSPECIFIED);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index b5c6442..6c73d3e 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -358,7 +358,8 @@ static void rcar_thermal_work(struct work_struct *work)
 		return;
 
 	if (nctemp != cctemp)
-		thermal_zone_device_update(priv->zone);
+		thermal_zone_device_update(priv->zone,
+					   THERMAL_EVENT_UNSPECIFIED);
 }
 
 static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
index 1f165c9..e227a9f 100644
--- a/drivers/thermal/rockchip_thermal.c
+++ b/drivers/thermal/rockchip_thermal.c
@@ -873,7 +873,8 @@ static irqreturn_t rockchip_thermal_alarm_irq_thread(int irq, void *dev)
 	thermal->chip->irq_ack(thermal->regs);
 
 	for (i = 0; i < thermal->chip->chn_num; i++)
-		thermal_zone_device_update(thermal->sensors[i].tzd);
+		thermal_zone_device_update(thermal->sensors[i].tzd,
+					   THERMAL_EVENT_UNSPECIFIED);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index f3ce94e..ad1186d 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -225,7 +225,7 @@ static void exynos_report_trigger(struct exynos_tmu_data *p)
 		return;
 	}
 
-	thermal_zone_device_update(tz);
+	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 
 	mutex_lock(&tz->lock);
 	/* Find the level for which trip happened */
diff --git a/drivers/thermal/st/st_thermal_memmap.c b/drivers/thermal/st/st_thermal_memmap.c
index fc0c9e1..91d4231 100644
--- a/drivers/thermal/st/st_thermal_memmap.c
+++ b/drivers/thermal/st/st_thermal_memmap.c
@@ -42,7 +42,8 @@ static irqreturn_t st_mmap_thermal_trip_handler(int irq, void *sdata)
 {
 	struct st_thermal_sensor *sensor = sdata;
 
-	thermal_zone_device_update(sensor->thermal_dev);
+	thermal_zone_device_update(sensor->thermal_dev,
+				   THERMAL_EVENT_UNSPECIFIED);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index f2d55e4..226b0b4ac 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -607,7 +607,8 @@ static void thermal_zone_device_reset(struct thermal_zone_device *tz)
 		pos->initialized = false;
 }
 
-void thermal_zone_device_update(struct thermal_zone_device *tz)
+void thermal_zone_device_update(struct thermal_zone_device *tz,
+				enum thermal_notify_event event)
 {
 	int count;
 
@@ -621,6 +622,8 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
 
 	thermal_zone_set_trips(tz);
 
+	tz->notify_event = event;
+
 	for (count = 0; count < tz->trips; count++)
 		handle_thermal_trip(tz, count);
 }
@@ -631,7 +634,7 @@ static void thermal_zone_device_check(struct work_struct *work)
 	struct thermal_zone_device *tz = container_of(work, struct
 						      thermal_zone_device,
 						      poll_queue.work);
-	thermal_zone_device_update(tz);
+	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 }
 
 /* sys I/F for thermal zone */
@@ -755,7 +758,7 @@ trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 	if (ret)
 		return ret;
 
-	thermal_zone_device_update(tz);
+	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 
 	return count;
 }
@@ -877,7 +880,7 @@ passive_store(struct device *dev, struct device_attribute *attr,
 
 	tz->forced_passive = state;
 
-	thermal_zone_device_update(tz);
+	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 
 	return count;
 }
@@ -968,7 +971,7 @@ emul_temp_store(struct device *dev, struct device_attribute *attr,
 	}
 
 	if (!ret)
-		thermal_zone_device_update(tz);
+		thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 
 	return ret ? ret : count;
 }
@@ -1564,7 +1567,8 @@ __thermal_cooling_device_register(struct device_node *np,
 	mutex_lock(&thermal_list_lock);
 	list_for_each_entry(pos, &thermal_tz_list, node)
 		if (atomic_cmpxchg(&pos->need_update, 1, 0))
-			thermal_zone_device_update(pos);
+			thermal_zone_device_update(pos,
+						   THERMAL_EVENT_UNSPECIFIED);
 	mutex_unlock(&thermal_list_lock);
 
 	return cdev;
@@ -2007,7 +2011,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
 	thermal_zone_device_reset(tz);
 	/* Update the new thermal zone and mark it as already updated. */
 	if (atomic_cmpxchg(&tz->need_update, 1, 0))
-		thermal_zone_device_update(tz);
+		thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 
 	return tz;
 
@@ -2294,7 +2298,8 @@ static int thermal_pm_notify(struct notifier_block *nb,
 		atomic_set(&in_suspend, 0);
 		list_for_each_entry(tz, &thermal_tz_list, node) {
 			thermal_zone_device_reset(tz);
-			thermal_zone_device_update(tz);
+			thermal_zone_device_update(tz,
+						   THERMAL_EVENT_UNSPECIFIED);
 		}
 		break;
 	default:
diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
index 4a6757c..0586bd0 100644
--- a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
+++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
@@ -52,7 +52,7 @@ 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);
+	thermal_zone_device_update(data->ti_thermal, THERMAL_EVENT_UNSPECIFIED);
 
 	dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
 		data->ti_thermal->type);
@@ -205,7 +205,7 @@ static int ti_thermal_set_mode(struct thermal_zone_device *thermal,
 	data->mode = mode;
 	ti_bandgap_write_update_interval(bgp, data->sensor_id,
 					data->ti_thermal->polling_delay);
-	thermal_zone_device_update(data->ti_thermal);
+	thermal_zone_device_update(data->ti_thermal, THERMAL_EVENT_UNSPECIFIED);
 	dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
 		data->ti_thermal->polling_delay);
 
diff --git a/drivers/thermal/x86_pkg_temp_thermal.c b/drivers/thermal/x86_pkg_temp_thermal.c
index 97f0a2b..95f4c1b 100644
--- a/drivers/thermal/x86_pkg_temp_thermal.c
+++ b/drivers/thermal/x86_pkg_temp_thermal.c
@@ -348,7 +348,8 @@ static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work)
 	}
 	if (notify) {
 		pr_debug("thermal_zone_device_update\n");
-		thermal_zone_device_update(phdev->tzone);
+		thermal_zone_device_update(phdev->tzone,
+					   THERMAL_EVENT_UNSPECIFIED);
 	}
 }
 
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index b3c16f0..511182a 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -92,6 +92,17 @@ enum thermal_trend {
 	THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
 };
 
+/* Thermal notification reason */
+enum thermal_notify_event {
+	THERMAL_EVENT_UNSPECIFIED, /* Unspecified event */
+	THERMAL_EVENT_TEMP_SAMPLE, /* New Temperature sample */
+	THERMAL_TRIP_VIOLATED, /* TRIP Point violation */
+	THERMAL_TRIP_CHANGED, /* TRIP Point temperature changed */
+	THERMAL_DEVICE_DOWN, /* Thermal device is down */
+	THERMAL_DEVICE_UP, /* Thermal device is up after a down event */
+	THERMAL_DEVICE_POWER_CAPABILITY_CHANGED, /* power capability changed */
+};
+
 struct thermal_zone_device_ops {
 	int (*bind) (struct thermal_zone_device *,
 		     struct thermal_cooling_device *);
@@ -187,6 +198,7 @@ struct thermal_attr {
  * @lock:	lock to protect thermal_instances list
  * @node:	node in thermal_tz_list (in thermal_core.c)
  * @poll_queue:	delayed work for polling
+ * @notify_event: Last notification event
  */
 struct thermal_zone_device {
 	int id;
@@ -217,6 +229,7 @@ struct thermal_zone_device {
 	struct mutex lock;
 	struct list_head node;
 	struct delayed_work poll_queue;
+	enum thermal_notify_event notify_event;
 };
 
 /**
@@ -436,7 +449,8 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 				     unsigned int);
 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
 				       struct thermal_cooling_device *);
-void thermal_zone_device_update(struct thermal_zone_device *);
+void thermal_zone_device_update(struct thermal_zone_device *,
+				enum thermal_notify_event);
 void thermal_zone_set_trips(struct thermal_zone_device *);
 
 struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
@@ -487,7 +501,8 @@ static inline int thermal_zone_unbind_cooling_device(
 	struct thermal_zone_device *tz, int trip,
 	struct thermal_cooling_device *cdev)
 { return -ENODEV; }
-static inline void thermal_zone_device_update(struct thermal_zone_device *tz)
+static inline void thermal_zone_device_update(struct thermal_zone_device *tz,
+					      enum thermal_notify_event event)
 { }
 static inline void thermal_zone_set_trips(struct thermal_zone_device *tz)
 { }