[PATCH 2/9] thermal: exynos: Add support for instance based register/unregister

[Amit Daniel Kachhap <amit.daniel@samsung.com>]

This code modifies the thermal driver to have multiple thermal zone
support by replacing the global thermal zone varibale with device data
member of thermal_zone_device.

Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
---
 drivers/thermal/exynos_thermal.c |   65 ++++++++++++++++++++++---------------
 1 files changed, 39 insertions(+), 26 deletions(-)

diff --git a/drivers/thermal/exynos_thermal.c b/drivers/thermal/exynos_thermal.c
index 1cd7837..dc9b91b 100644
--- a/drivers/thermal/exynos_thermal.c
+++ b/drivers/thermal/exynos_thermal.c
@@ -148,7 +148,8 @@ struct thermal_sensor_conf {
 	int (*write_emul_temp)(void *drv_data, unsigned long temp);
 	struct thermal_trip_point_conf trip_data;
 	struct thermal_cooling_conf cooling_data;
-	void *private_data;
+	void *driver_data;
+	void *pzone_data;
 };
 
 struct exynos_thermal_zone {
@@ -161,14 +162,14 @@ struct exynos_thermal_zone {
 	bool bind;
 };
 
-static struct exynos_thermal_zone *th_zone;
-static void exynos_unregister_thermal(void);
+static void exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf);
 static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf);
 
 /* Get mode callback functions for thermal zone */
 static int exynos_get_mode(struct thermal_zone_device *thermal,
 			enum thermal_device_mode *mode)
 {
+	struct exynos_thermal_zone *th_zone = thermal->devdata;
 	if (th_zone)
 		*mode = th_zone->mode;
 	return 0;
@@ -178,25 +179,26 @@ static int exynos_get_mode(struct thermal_zone_device *thermal,
 static int exynos_set_mode(struct thermal_zone_device *thermal,
 			enum thermal_device_mode mode)
 {
-	if (!th_zone->therm_dev) {
+	struct exynos_thermal_zone *th_zone = thermal->devdata;
+	if (!th_zone) {
 		pr_notice("thermal zone not registered\n");
 		return 0;
 	}
 
-	mutex_lock(&th_zone->therm_dev->lock);
+	mutex_lock(&thermal->lock);
 
 	if (mode == THERMAL_DEVICE_ENABLED &&
 		!th_zone->sensor_conf->trip_data.trigger_falling)
-		th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
+		thermal->polling_delay = IDLE_INTERVAL;
 	else
-		th_zone->therm_dev->polling_delay = 0;
+		thermal->polling_delay = 0;
 
-	mutex_unlock(&th_zone->therm_dev->lock);
+	mutex_unlock(&thermal->lock);
 
 	th_zone->mode = mode;
-	thermal_zone_device_update(th_zone->therm_dev);
+	thermal_zone_device_update(thermal);
 	pr_info("thermal polling set for duration=%d msec\n",
-				th_zone->therm_dev->polling_delay);
+				thermal->polling_delay);
 	return 0;
 }
 
@@ -223,6 +225,8 @@ static int exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
 static int exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
 				unsigned long *temp)
 {
+	struct exynos_thermal_zone *th_zone = thermal->devdata;
+
 	if (trip < GET_TRIP(MONITOR_ZONE) || trip > GET_TRIP(PANIC_ZONE))
 		return -EINVAL;
 
@@ -269,6 +273,7 @@ static int exynos_bind(struct thermal_zone_device *thermal,
 {
 	int ret = 0, i, tab_size, level;
 	struct freq_clip_table *tab_ptr, *clip_data;
+	struct exynos_thermal_zone *th_zone = thermal->devdata;
 	struct thermal_sensor_conf *data = th_zone->sensor_conf;
 
 	tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
@@ -315,6 +320,7 @@ static int exynos_unbind(struct thermal_zone_device *thermal,
 			struct thermal_cooling_device *cdev)
 {
 	int ret = 0, i, tab_size;
+	struct exynos_thermal_zone *th_zone = thermal->devdata;
 	struct thermal_sensor_conf *data = th_zone->sensor_conf;
 
 	if (th_zone->bind == false)
@@ -357,13 +363,14 @@ static int exynos_unbind(struct thermal_zone_device *thermal,
 static int exynos_get_temp(struct thermal_zone_device *thermal,
 			unsigned long *temp)
 {
+	struct exynos_thermal_zone *th_zone = thermal->devdata;
 	void *data;
 
 	if (!th_zone->sensor_conf) {
 		pr_info("Temperature sensor not initialised\n");
 		return -EINVAL;
 	}
-	data = th_zone->sensor_conf->private_data;
+	data = th_zone->sensor_conf->driver_data;
 	*temp = th_zone->sensor_conf->read_temperature(data);
 	/* convert the temperature into millicelsius */
 	*temp = *temp * MCELSIUS;
@@ -376,12 +383,13 @@ static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
 {
 	void *data;
 	int ret = -EINVAL;
+	struct exynos_thermal_zone *th_zone = thermal->devdata;
 
 	if (!th_zone->sensor_conf) {
 		pr_info("Temperature sensor not initialised\n");
 		return -EINVAL;
 	}
-	data = th_zone->sensor_conf->private_data;
+	data = th_zone->sensor_conf->driver_data;
 	if (th_zone->sensor_conf->write_emul_temp)
 		ret = th_zone->sensor_conf->write_emul_temp(data, temp);
 	return ret;
@@ -391,7 +399,7 @@ static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
 static int exynos_get_trend(struct thermal_zone_device *thermal,
 			int trip, enum thermal_trend *trend)
 {
-	int ret;
+	int ret = 0;
 	unsigned long trip_temp;
 
 	ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
@@ -403,7 +411,7 @@ static int exynos_get_trend(struct thermal_zone_device *thermal,
 	else
 		*trend = THERMAL_TREND_DROP_FULL;
 
-	return 0;
+	return ret;
 }
 /* Operation callback functions for thermal zone */
 static struct thermal_zone_device_ops const exynos_dev_ops = {
@@ -423,11 +431,12 @@ static struct thermal_zone_device_ops const exynos_dev_ops = {
  * This function may be called from interrupt based temperature sensor
  * when threshold is changed.
  */
-static void exynos_report_trigger(void)
+static void exynos_report_trigger(struct thermal_sensor_conf *conf)
 {
 	unsigned int i;
 	char data[10];
 	char *envp[] = { data, NULL };
+	struct exynos_thermal_zone *th_zone = conf->pzone_data;
 
 	if (!th_zone || !th_zone->therm_dev)
 		return;
@@ -468,6 +477,7 @@ static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
 {
 	int ret;
 	struct cpumask mask_val;
+	struct exynos_thermal_zone *th_zone;
 
 	if (!sensor_conf || !sensor_conf->read_temperature) {
 		pr_err("Temperature sensor not initialised\n");
@@ -489,7 +499,7 @@ static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
 	th_zone->cool_dev_size++;
 
 	th_zone->therm_dev = thermal_zone_device_register(sensor_conf->name,
-			EXYNOS_ZONE_COUNT, 0, NULL, &exynos_dev_ops, NULL, 0,
+			EXYNOS_ZONE_COUNT, 0, th_zone, &exynos_dev_ops, NULL, 0,
 			sensor_conf->trip_data.trigger_falling ?
 			0 : IDLE_INTERVAL);
 
@@ -499,20 +509,22 @@ static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
 		goto err_unregister;
 	}
 	th_zone->mode = THERMAL_DEVICE_ENABLED;
+	sensor_conf->pzone_data = th_zone;
 
 	pr_info("Exynos: Kernel Thermal management registered\n");
 
 	return 0;
 
 err_unregister:
-	exynos_unregister_thermal();
+	exynos_unregister_thermal(sensor_conf);
 	return ret;
 }
 
 /* Un-Register with the in-kernel thermal management */
-static void exynos_unregister_thermal(void)
+static void exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf)
 {
 	int i;
+	struct exynos_thermal_zone *th_zone = sensor_conf->pzone_data;
 
 	if (!th_zone)
 		return;
@@ -774,12 +786,18 @@ static int exynos_tmu_set_emulation(void *drv_data,	unsigned long temp)
 	{ return -EINVAL; }
 #endif/*CONFIG_THERMAL_EMULATION*/
 
+static struct thermal_sensor_conf exynos_sensor_conf = {
+	.name			= "exynos-therm",
+	.read_temperature	= (int (*)(void *))exynos_tmu_read,
+	.write_emul_temp	= exynos_tmu_set_emulation,
+};
+
 static void exynos_tmu_work(struct work_struct *work)
 {
 	struct exynos_tmu_data *data = container_of(work,
 			struct exynos_tmu_data, irq_work);
 
-	exynos_report_trigger();
+	exynos_report_trigger(&exynos_sensor_conf);
 	mutex_lock(&data->lock);
 	clk_enable(data->clk);
 	if (data->soc == SOC_ARCH_EXYNOS)
@@ -804,11 +822,6 @@ static irqreturn_t exynos_tmu_irq(int irq, void *id)
 
 	return IRQ_HANDLED;
 }
-static struct thermal_sensor_conf exynos_sensor_conf = {
-	.name			= "exynos-therm",
-	.read_temperature	= (int (*)(void *))exynos_tmu_read,
-	.write_emul_temp	= exynos_tmu_set_emulation,
-};
 
 #if defined(CONFIG_CPU_EXYNOS4210)
 static struct exynos_tmu_platform_data const exynos4210_default_tmu_data = {
@@ -987,7 +1000,7 @@ static int exynos_tmu_probe(struct platform_device *pdev)
 	exynos_tmu_control(pdev, true);
 
 	/* Register the sensor with thermal management interface */
-	(&exynos_sensor_conf)->private_data = data;
+	(&exynos_sensor_conf)->driver_data = data;
 	exynos_sensor_conf.trip_data.trip_count = pdata->trigger_level0_en +
 			pdata->trigger_level1_en + pdata->trigger_level2_en +
 			pdata->trigger_level3_en;
@@ -1026,7 +1039,7 @@ static int exynos_tmu_remove(struct platform_device *pdev)
 
 	exynos_tmu_control(pdev, false);
 
-	exynos_unregister_thermal();
+	exynos_unregister_thermal(&exynos_sensor_conf);
 
 	clk_put(data->clk);
 
-- 
1.7.1