cpufreq_powersave.c 1.4 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162
  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. #include <linux/kernel.h>
  13. #include <linux/module.h>
  14. #include <linux/cpufreq.h>
  15. #include <linux/init.h>
  16. #define dprintk(msg...) \
  17. cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "powersave", msg)
  18. static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
  19. unsigned int event)
  20. {
  21. switch (event) {
  22. case CPUFREQ_GOV_START:
  23. case CPUFREQ_GOV_LIMITS:
  24. dprintk("setting to %u kHz because of event %u\n",
  25. policy->min, event);
  26. __cpufreq_driver_target(policy, policy->min,
  27. CPUFREQ_RELATION_L);
  28. break;
  29. default:
  30. break;
  31. }
  32. return 0;
  33. }
  34. static struct cpufreq_governor cpufreq_gov_powersave = {
  35. .name = "powersave",
  36. .governor = cpufreq_governor_powersave,
  37. .owner = THIS_MODULE,
  38. };
  39. static int __init cpufreq_gov_powersave_init(void)
  40. {
  41. return cpufreq_register_governor(&cpufreq_gov_powersave);
  42. }
  43. static void __exit cpufreq_gov_powersave_exit(void)
  44. {
  45. cpufreq_unregister_governor(&cpufreq_gov_powersave);
  46. }
  47. MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
  48. MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
  49. MODULE_LICENSE("GPL");
  50. module_init(cpufreq_gov_powersave_init);
  51. module_exit(cpufreq_gov_powersave_exit);