/* * 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/of.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(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" }, {}, }; #endif static struct platform_driver db8500_cpufreq_cooling_driver = { .driver = { .owner = THIS_MODULE, .name = "db8500-cpufreq-cooling", .of_match_table = of_match_ptr(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");