ux500: Thermal power off

To determine whether the system had a thermal power off or a regular software
power off upon the next boot, the system must utilize the thermal power off
bit, ThDB8500SWoff, in AB8500 register STw4500Ctrl1.

ST-Ericsson ID: 354533
ST-Ericsson Linux next: N/A
ST-Ericsson FOSS-OUT ID: Trivial

Change-Id: I07440dcdc39a86cb72aa95d86411a1f020b05cae
Signed-off-by: Daniel Willerud <daniel.willerud@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/28515
Reviewed-by: QABUILD
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>

5 files changed, 57 insertions, 4 deletions

diff --git a/drivers/hwmon/ab8500.c b/drivers/hwmon/ab8500.c
index 45a8ef675b3..db601e3158d 100644
--- a/drivers/hwmon/ab8500.c
+++ b/drivers/hwmon/ab8500.c
@@ -117,6 +117,8 @@ static int ab8500_temp_irq_handler(int irq, struct abx500_temp *data)
 	mutex_lock(&data->lock);
 	data->crit_alarm[4] = 1;
 	mutex_unlock(&data->lock);
+
+	hwmon_notify(data->crit_alarm[4], NULL);
 	sysfs_notify(&data->pdev->dev.kobj, NULL, "temp5_crit_alarm");
 	dev_info(&data->pdev->dev, "AB8500 thermal warning,"
 		" power off in %lu s\n", data->power_off_delay);
diff --git a/drivers/hwmon/abx500.c b/drivers/hwmon/abx500.c
index 6666dc27065..68da2d03dbd 100644
--- a/drivers/hwmon/abx500.c
+++ b/drivers/hwmon/abx500.c
@@ -163,6 +163,7 @@ static void gpadc_monitor(struct work_struct *work)
 					ret);
 				break;
 			}
+			hwmon_notify(data->max_alarm[i], NULL);
 			sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
 		}
 		if (updated_max_hyst_alarm) {
diff --git a/drivers/hwmon/dbx500.c b/drivers/hwmon/dbx500.c
index a26e08b3707..cd44e78030c 100644
--- a/drivers/hwmon/dbx500.c
+++ b/drivers/hwmon/dbx500.c
@@ -323,6 +323,7 @@ static irqreturn_t prcmu_hotmon_high_irq_handler(int irq, void *irq_data)
 	data->max_alarm[0] = 1;
 	mutex_unlock(&data->lock);
 
+	hwmon_notify(data->max_alarm[0], NULL);
 	sysfs_notify(&pdev->dev.kobj, NULL, "temp1_max_alarm");
 	dev_dbg(&pdev->dev, "DBX500 thermal warning, power off in %lu s\n",
 		 (data->power_off_delay) / 1000);
diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c
index cf58f694539..2a328cfaf43 100644
--- a/drivers/mfd/ab8500-sysctrl.c
+++ b/drivers/mfd/ab8500-sysctrl.c
@@ -14,11 +14,15 @@
 #include <linux/mfd/abx500.h>
 #include <linux/mfd/abx500/ab8500.h>
 #include <linux/mfd/abx500/ab8500-sysctrl.h>
+#include <linux/time.h>
+#include <linux/hwmon.h>
 
 static struct device *sysctrl_dev;
 
 void ab8500_power_off(void)
 {
+	struct ab8500_platform_data *plat;
+	struct timespec ts;
 	sigset_t old;
 	sigset_t all;
 	static char *pss[] = {"ab8500_ac", "ab8500_usb"};
@@ -66,14 +70,51 @@ void ab8500_power_off(void)
 shutdown:
 	sigfillset(&all);
 
+	plat = dev_get_platdata(sysctrl_dev->parent);
+		getnstimeofday(&ts);
 	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
-		(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
-					 AB8500_STW4500CTRL1_SWOFF |
-					 AB8500_STW4500CTRL1_SWRESET4500N);
-		(void)sigprocmask(SIG_SETMASK, &old, NULL);
+		if (ts.tv_sec == 0 ||
+			(ts.tv_sec - plat->thermal_set_time_sec >
+				plat->thermal_time_out))
+			plat->thermal_power_off_pending = false;
+		if (!plat->thermal_power_off_pending) {
+			(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
+				AB8500_STW4500CTRL1_SWOFF |
+				AB8500_STW4500CTRL1_SWRESET4500N);
+			(void)sigprocmask(SIG_SETMASK, &old, NULL);
+		} else {
+			(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
+				AB8500_STW4500CTRL1_THDB8500SWOFF |
+				AB8500_STW4500CTRL1_SWRESET4500N);
+			(void)sigprocmask(SIG_SETMASK, &old, NULL);
+		}
 	}
 }
 
+static int ab8500_notifier_call(struct notifier_block *this,
+				unsigned long val, void *data)
+{
+	struct ab8500_platform_data *plat;
+	static struct timespec ts;
+	if (sysctrl_dev == NULL)
+		return -EAGAIN;
+
+	plat = dev_get_platdata(sysctrl_dev->parent);
+	if (val) {
+		getnstimeofday(&ts);
+		plat->thermal_set_time_sec = ts.tv_sec;
+		plat->thermal_power_off_pending = true;
+	} else {
+		plat->thermal_set_time_sec = 0;
+		plat->thermal_power_off_pending = false;
+	}
+	return 0;
+}
+
+static struct notifier_block ab8500_notifier = {
+	.notifier_call = ab8500_notifier_call,
+};
+
 static inline bool valid_bank(u8 bank)
 {
 	return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
@@ -118,6 +159,7 @@ static int __devinit ab8500_sysctrl_probe(struct platform_device *pdev)
 	plat = dev_get_platdata(pdev->dev.parent);
 	if (plat->pm_power_off)
 		pm_power_off = ab8500_power_off;
+	hwmon_notifier_register(&ab8500_notifier);
 	return 0;
 }
 
diff --git a/include/linux/mfd/abx500/ab8500.h b/include/linux/mfd/abx500/ab8500.h
index c1016272ab2..f746cf3ca34 100644
--- a/include/linux/mfd/abx500/ab8500.h
+++ b/include/linux/mfd/abx500/ab8500.h
@@ -266,6 +266,10 @@ struct ab8500_gpio_platform_data;
 
 /**
  * struct ab8500_platform_data - AB8500 platform data
+ * @pm_power_off: Should machine pm power off hook be registered or not
+ * @thermal_power_off_pending: Set if there was a thermal alarm
+ * @thermal_set_time_sec: Time of the thermal alarm
+ * @thermal_time_out: Time out before the thermal alarm should be ignored
  * @irq_base: start of AB8500 IRQs, AB8500_NR_IRQS will be used
  * @init: board-specific initialization after detection of ab8500
  * @num_regulator_reg_init: number of regulator init registers
@@ -279,6 +283,9 @@ struct ab8500_gpio_platform_data;
 struct ab8500_platform_data {
 	int irq_base;
 	bool pm_power_off;
+	bool thermal_power_off_pending;
+	long thermal_set_time_sec;
+	long thermal_time_out;
 	void (*init) (struct ab8500 *);
 	int num_regulator_reg_init;
 	struct ab8500_regulator_reg_init *regulator_reg_init;