cpufreq_powersave.c 1.6 KB

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  1. /*
  2. * linux/drivers/cpufreq/cpufreq_powersave.c
  3. *
  4. * Copyright (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
  5. *
  6. *
  7. * This program is free software; you can redistribute it and/or modify
  8. * it under the terms of the GNU General Public License version 2 as
  9. * published by the Free Software Foundation.
  10. *
  11. */
  12. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13. #include <linux/cpufreq.h>
  14. #include <linux/init.h>
  15. #include <linux/module.h>
  16. static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
  17. unsigned int event)
  18. {
  19. switch (event) {
  20. case CPUFREQ_GOV_START:
  21. case CPUFREQ_GOV_LIMITS:
  22. pr_debug("setting to %u kHz because of event %u\n",
  23. policy->min, event);
  24. __cpufreq_driver_target(policy, policy->min,
  25. CPUFREQ_RELATION_L);
  26. break;
  27. default:
  28. break;
  29. }
  30. return 0;
  31. }
  32. static struct cpufreq_governor cpufreq_gov_powersave = {
  33. .name = "powersave",
  34. .governor = cpufreq_governor_powersave,
  35. .owner = THIS_MODULE,
  36. };
  37. static int __init cpufreq_gov_powersave_init(void)
  38. {
  39. return cpufreq_register_governor(&cpufreq_gov_powersave);
  40. }
  41. static void __exit cpufreq_gov_powersave_exit(void)
  42. {
  43. cpufreq_unregister_governor(&cpufreq_gov_powersave);
  44. }
  45. MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
  46. MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
  47. MODULE_LICENSE("GPL");
  48. #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
  49. struct cpufreq_governor *cpufreq_default_governor(void)
  50. {
  51. return &cpufreq_gov_powersave;
  52. }
  53. fs_initcall(cpufreq_gov_powersave_init);
  54. #else
  55. module_init(cpufreq_gov_powersave_init);
  56. #endif
  57. module_exit(cpufreq_gov_powersave_exit);