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path: root/drivers/thermal/db8500_cpufreq_cooling.c
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Diffstat (limited to 'drivers/thermal/db8500_cpufreq_cooling.c')
-rw-r--r--drivers/thermal/db8500_cpufreq_cooling.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/thermal/db8500_cpufreq_cooling.c b/drivers/thermal/db8500_cpufreq_cooling.c
new file mode 100644
index 000000000000..4cf8e72af90a
--- /dev/null
+++ b/drivers/thermal/db8500_cpufreq_cooling.c
@@ -0,0 +1,108 @@
+/*
+ * db8500_cpufreq_cooling.c - DB8500 cpufreq works as cooling device.
+ *
+ * Copyright (C) 2012 ST-Ericsson
+ * Copyright (C) 2012 Linaro Ltd.
+ *
+ * Author: Hongbo Zhang <hongbo.zhang@linaro.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <linux/cpu_cooling.h>
+#include <linux/cpufreq.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+static int db8500_cpufreq_cooling_probe(struct platform_device *pdev)
+{
+ struct thermal_cooling_device *cdev;
+ struct cpumask mask_val;
+
+ /* make sure cpufreq driver has been initialized */
+ if (!cpufreq_frequency_get_table(0))
+ return -EPROBE_DEFER;
+
+ cpumask_set_cpu(0, &mask_val);
+ cdev = cpufreq_cooling_register(&mask_val);
+
+ if (IS_ERR_OR_NULL(cdev)) {
+ dev_err(&pdev->dev, "Failed to register cooling device\n");
+ return PTR_ERR(cdev);
+ }
+
+ platform_set_drvdata(pdev, cdev);
+
+ dev_info(&pdev->dev, "Cooling device registered: %s\n", cdev->type);
+
+ return 0;
+}
+
+static int db8500_cpufreq_cooling_remove(struct platform_device *pdev)
+{
+ struct thermal_cooling_device *cdev = platform_get_drvdata(pdev);
+
+ cpufreq_cooling_unregister(cdev);
+
+ return 0;
+}
+
+static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ return -ENOSYS;
+}
+
+static int db8500_cpufreq_cooling_resume(struct platform_device *pdev)
+{
+ return -ENOSYS;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id db8500_cpufreq_cooling_match[] = {
+ { .compatible = "stericsson,db8500-cpufreq-cooling" },
+ {},
+};
+#else
+#define db8500_cpufreq_cooling_match NULL
+#endif
+
+static struct platform_driver db8500_cpufreq_cooling_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "db8500-cpufreq-cooling",
+ .of_match_table = db8500_cpufreq_cooling_match,
+ },
+ .probe = db8500_cpufreq_cooling_probe,
+ .suspend = db8500_cpufreq_cooling_suspend,
+ .resume = db8500_cpufreq_cooling_resume,
+ .remove = db8500_cpufreq_cooling_remove,
+};
+
+static int __init db8500_cpufreq_cooling_init(void)
+{
+ return platform_driver_register(&db8500_cpufreq_cooling_driver);
+}
+
+static void __exit db8500_cpufreq_cooling_exit(void)
+{
+ platform_driver_unregister(&db8500_cpufreq_cooling_driver);
+}
+
+/* Should be later than db8500_cpufreq_register */
+late_initcall(db8500_cpufreq_cooling_init);
+module_exit(db8500_cpufreq_cooling_exit);
+
+MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
+MODULE_DESCRIPTION("DB8500 cpufreq cooling driver");
+MODULE_LICENSE("GPL");