1 files changed, 334 insertions, 0 deletions
diff --git a/drivers/thermal/exynos_thermal.c b/drivers/thermal/exynos_thermal.c
new file mode 100644
index 00000000000..ff189b145ad
--- /dev/null
+++ b/drivers/thermal/exynos_thermal.c
@@ -0,0 +1,334 @@
+/* linux/drivers/staging/thermal_exynos4/thermal_interface.c
+ *
+ * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.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.
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/thermal.h>
+#include <linux/platform_device.h>
+#include <linux/cpufreq.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/cpu_cooling.h>
+#include <linux/platform_data/exynos4_tmu.h>
+#include <linux/exynos_thermal.h>
+
+static unsigned int verbose;
+
+struct exynos4_thermal_zone {
+	unsigned int idle_interval;
+	unsigned int active_interval;
+	struct thermal_zone_device *therm_dev;
+	struct thermal_cooling_device *cool_dev;
+	struct platform_device *exynos4_dev;
+	struct exynos4_tmu_platform_data *sensor_data;
+};
+static struct thermal_sensor_info *exynos4_sensor_info;
+
+static struct exynos4_thermal_zone *th_zone;
+
+static int exynos4_get_mode(struct thermal_zone_device *thermal,
+			    enum thermal_device_mode *mode)
+{
+	if (exynos4_sensor_info) {
+		pr_info("Temperature sensor not initialised\n");
+		*mode = THERMAL_DEVICE_DISABLED;
+	} else
+		*mode = THERMAL_DEVICE_ENABLED;
+	return 0;
+}
+
+/*
+ * set operation mode;
+ * enabled: the thermal layer of the kernel takes care about
+ *          the temperature.
+ * disabled: temperature sensor is not enabled.
+ */
+static int exynos4_set_mode(struct thermal_zone_device *thermal,
+			    enum thermal_device_mode mode)
+{
+	if (!th_zone->therm_dev) {
+		pr_notice("thermal zone not registered\n");
+		return 0;
+	}
+	if (mode == THERMAL_DEVICE_ENABLED)
+		th_zone->therm_dev->polling_delay =
+				th_zone->active_interval*1000;
+	else
+		th_zone->therm_dev->polling_delay =
+				th_zone->idle_interval*1000;
+
+	thermal_zone_device_update(th_zone->therm_dev);
+	pr_info("thermal polling set for duration=%d sec\n",
+				th_zone->therm_dev->polling_delay/1000);
+	return 0;
+}
+
+/*This may be called from interrupt based temperature sensor*/
+void exynos4_report_trigger(void)
+{
+	unsigned int th_temp = th_zone->sensor_data->threshold;
+	unsigned int monitor_temp = th_temp +
+			th_zone->sensor_data->trigger_levels[1];
+
+	thermal_zone_device_update(th_zone->therm_dev);
+
+	if (th_zone->therm_dev->last_temperature > monitor_temp)
+		th_zone->therm_dev->polling_delay =
+					th_zone->active_interval*1000;
+	else
+		th_zone->therm_dev->polling_delay =
+					th_zone->idle_interval*1000;
+}
+
+static int exynos4_get_trip_type(struct thermal_zone_device *thermal, int trip,
+				 enum thermal_trip_type *type)
+{
+	if (verbose)
+		pr_info("%s, trip no=%d\n", __func__, trip);
+	if (trip == 0 || trip == 1)
+		*type = THERMAL_TRIP_STATE_ACTIVE;
+	else if (trip == 2)
+		*type = THERMAL_TRIP_CRITICAL;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+static int exynos4_get_trip_temp(struct thermal_zone_device *thermal, int trip,
+				 unsigned long *temp)
+{
+	unsigned int th_temp = th_zone->sensor_data->threshold;
+
+	/*Monitor zone*/
+	if (trip == 0)
+		*temp = th_temp + th_zone->sensor_data->trigger_levels[1];
+	/*Warn zone*/
+	else if (trip == 1)
+		*temp = th_temp + th_zone->sensor_data->trigger_levels[2];
+	/*Panic zone*/
+	else if (trip == 2)
+		*temp = th_temp + th_zone->sensor_data->trigger_levels[3];
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+static int exynos4_get_crit_temp(struct thermal_zone_device *thermal,
+				 unsigned long *temp)
+{
+	unsigned int th_temp = th_zone->sensor_data->threshold;
+	/*Panic zone*/
+	*temp = th_temp + th_zone->sensor_data->trigger_levels[3];
+	return 0;
+}
+
+static int exynos4_bind(struct thermal_zone_device *thermal,
+			struct thermal_cooling_device *cdev)
+{
+	/* if the cooling device is the one from exynos4 bind it */
+	if (cdev != th_zone->cool_dev)
+		return 0;
+
+	if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
+		pr_err("error binding cooling dev\n");
+		return -EINVAL;
+	}
+	if (thermal_zone_bind_cooling_device(thermal, 1, cdev)) {
+		pr_err("error binding cooling dev\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int exynos4_unbind(struct thermal_zone_device *thermal,
+			  struct thermal_cooling_device *cdev)
+{
+	if (cdev != th_zone->cool_dev)
+		return 0;
+	if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
+		pr_err("error unbinding cooling dev\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int exynos4_get_temp(struct thermal_zone_device *thermal,
+			       unsigned long *t)
+{
+	int temp = 0;
+	void *data;
+
+	if (!exynos4_sensor_info) {
+		pr_info("Temperature sensor not initialised\n");
+		return -EINVAL;
+	}
+	data = exynos4_sensor_info->private_data;
+	temp = exynos4_sensor_info->read_temperature(data);
+
+	if (verbose)
+		pr_notice("temp %d\n", temp);
+
+	*t = temp;
+	return 0;
+}
+
+/* bind callback functions to thermalzone */
+static struct thermal_zone_device_ops exynos4_dev_ops = {
+	.bind = exynos4_bind,
+	.unbind = exynos4_unbind,
+	.get_temp = exynos4_get_temp,
+	.get_mode = exynos4_get_mode,
+	.set_mode = exynos4_set_mode,
+	.get_trip_type = exynos4_get_trip_type,
+	.get_trip_temp = exynos4_get_trip_temp,
+	.get_crit_temp = exynos4_get_crit_temp,
+};
+
+int exynos4_register_temp_sensor(struct thermal_sensor_info *sensor_info)
+{
+	exynos4_sensor_info = sensor_info;
+	return 0;
+}
+
+
+static int __devinit exynos4_probe(struct platform_device *device)
+{
+	return 0;
+}
+
+static int exynos4_remove(struct platform_device *device)
+{
+	return 0;
+}
+
+static struct platform_driver exynos4_driver = {
+	.driver = {
+		.name  = "exynos4",
+		.owner = THIS_MODULE,
+	},
+	.probe = exynos4_probe,
+	.remove = exynos4_remove,
+};
+
+static int exynos4_register_platform(void)
+{
+	int err = 0;
+
+	th_zone = kzalloc(sizeof(struct exynos4_thermal_zone), GFP_KERNEL);
+	if (!th_zone)
+		return -ENOMEM;
+
+	err = platform_driver_register(&exynos4_driver);
+	if (err)
+		return err;
+
+	th_zone->exynos4_dev = platform_device_alloc("exynos4", -1);
+	if (!th_zone->exynos4_dev) {
+		err = -ENOMEM;
+		goto err_device_alloc;
+	}
+	err = platform_device_add(th_zone->exynos4_dev);
+	if (err)
+		goto err_device_add;
+
+	return 0;
+
+err_device_add:
+	platform_device_put(th_zone->exynos4_dev);
+err_device_alloc:
+	platform_driver_unregister(&exynos4_driver);
+	return err;
+}
+
+static void exynos4_unregister_platform(void)
+{
+	platform_device_unregister(th_zone->exynos4_dev);
+	platform_driver_unregister(&exynos4_driver);
+	kfree(th_zone);
+}
+
+static int exynos4_register_thermal(void)
+{
+	if (!exynos4_sensor_info) {
+		pr_info("Temperature sensor not initialised\n");
+		return -EINVAL;
+	}
+
+	th_zone->sensor_data = exynos4_sensor_info->sensor_data;
+	if (!th_zone->sensor_data) {
+		pr_info("Temperature sensor data not initialised\n");
+		return -EINVAL;
+	}
+
+	th_zone->cool_dev = cpufreq_cooling_register(
+		(struct freq_pctg_table *)th_zone->sensor_data->freq_tab,
+		th_zone->sensor_data->level_count);
+
+	if (IS_ERR(th_zone->cool_dev))
+		return -EINVAL;
+
+	th_zone->therm_dev = thermal_zone_device_register("exynos4-therm",
+				3, NULL, &exynos4_dev_ops, 0, 0, 0, 1000);
+	if (IS_ERR(th_zone->therm_dev))
+		return -EINVAL;
+
+	th_zone->active_interval = 1;
+	th_zone->idle_interval = 10;
+	exynos4_set_mode(th_zone->therm_dev, THERMAL_DEVICE_DISABLED);
+
+	return 0;
+}
+
+static void exynos4_unregister_thermal(void)
+{
+	if (th_zone->cool_dev)
+		cpufreq_cooling_unregister();
+
+	if (th_zone->therm_dev)
+		thermal_zone_device_unregister(th_zone->therm_dev);
+}
+
+static int __init exynos4_thermal_init(void)
+{
+	int err = 0;
+
+	err = exynos4_register_platform();
+	if (err)
+		goto out_err;
+
+	err = exynos4_register_thermal();
+	if (err)
+		goto err_unreg;
+
+	return 0;
+
+err_unreg:
+	exynos4_unregister_thermal();
+	exynos4_unregister_platform();
+
+out_err:
+	return err;
+}
+
+static void __exit exynos4_thermal_exit(void)
+{
+	exynos4_unregister_thermal();
+	exynos4_unregister_platform();
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Amit Daniel <amit.kachhap@linaro.org>");
+MODULE_DESCRIPTION("samsung Exynos4 thermal monitor driver");
+
+module_init(exynos4_thermal_init);
+module_exit(exynos4_thermal_exit);