diff options
| author | Simon Glass <sjg@chromium.org> | 2019-02-16 20:24:58 -0700 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2019-02-20 15:27:09 +0800 |
| commit | 79a5be820d9b187a1d8617d6a1cb65392448322d (patch) | |
| tree | db2de64e2bced1305e1c0a8512c84cfc0c39d42d /arch/x86/include | |
| parent | 6744c0d6525e9fb9b5c7fc0d7b66c0d0cbdf6177 (diff) | |
sound: x86: Add beeping support in i8254
Adjust the code to allow beeping at different frequencies, using a
calculated value for timer 2.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/i8254.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/include/asm/i8254.h b/arch/x86/include/asm/i8254.h index 65c97614d3..d769daf85d 100644 --- a/arch/x86/include/asm/i8254.h +++ b/arch/x86/include/asm/i8254.h @@ -35,4 +35,22 @@ /* The clock frequency of the i8253/i8254 PIT */ #define PIT_TICK_RATE 1193182 +/** + * i8254_enable_beep() - Start a beep using the PCAT timer + * + * This starts beeping using the legacy i8254 timer. The beep may be silenced + * after a delay with i8254_disable_beep(). + * + * @frequency_hz: Frequency of beep in Hz + * @return 0 if OK, -EINVAL if frequency_hz is 0 + */ +int i8254_enable_beep(uint frequency_hz); + +/** + * i8254_disable_beep() - Disable the bepper + * + * This stops any existing beep + */ +void i8254_disable_beep(void); + #endif /* _ASMI386_I8954_H_ */ |