This patch makes the RTC emulation functions in arch/x86/kernel/hpet.c usable for kernel modules. It - exports the functions (EXPORT_SYMBOL_GPL()), - adds an interface to register the interrupt callback function instead of using only a fixed callback function and - replaces the rtc_get_rtc_time() function which depends on CONFIG_RTC with a call to get_rtc_time() which is defined in include/asm-generic/rtc.h. The only dependency to CONFIG_RTC is the call to rtc_interrupt() which is removed by the next patch. After this, there's no (code) dependency of this functions to CONFIG_RTC=y any more. Signed-off-by: Bernhard Walle --- arch/x86/kernel/hpet.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++- include/asm-x86/hpet.h | 3 +++ 2 files changed, 49 insertions(+), 1 deletion(-) --- a/arch/x86/kernel/hpet.c +++ b/arch/x86/kernel/hpet.c @@ -107,6 +107,7 @@ int is_hpet_enabled(void) { return is_hpet_capable() && hpet_legacy_int_enabled; } +EXPORT_SYMBOL_GPL(is_hpet_enabled); /* * When the hpet driver (/dev/hpet) is enabled, we need to reserve @@ -478,6 +479,7 @@ void hpet_disable(void) */ #include #include +#include #define DEFAULT_RTC_INT_FREQ 64 #define DEFAULT_RTC_SHIFT 6 @@ -492,6 +494,38 @@ static unsigned long hpet_default_delta; static unsigned long hpet_pie_delta; static unsigned long hpet_pie_limit; +static rtc_irq_handler irq_handler; + +/* + * Registers a IRQ handler. + */ +int hpet_register_irq_handler(rtc_irq_handler handler) +{ + if (!is_hpet_enabled()) + return -ENODEV; + if (irq_handler) + return -EBUSY; + + irq_handler = handler; + + return 0; +} +EXPORT_SYMBOL_GPL(hpet_register_irq_handler); + +/* + * Deregisters the IRQ handler registered with hpet_register_irq_handler() + * and does cleanup. + */ +void hpet_unregister_irq_handler(rtc_irq_handler handler) +{ + if (!is_hpet_enabled()) + return; + + irq_handler = NULL; + hpet_rtc_flags = 0; +} +EXPORT_SYMBOL_GPL(hpet_unregister_irq_handler); + /* * Timer 1 for RTC emulation. We use one shot mode, as periodic mode * is not supported by all HPET implementations for timer 1. @@ -533,6 +567,7 @@ int hpet_rtc_timer_init(void) return 1; } +EXPORT_SYMBOL_GPL(hpet_rtc_timer_init); /* * The functions below are called from rtc driver. @@ -547,6 +582,7 @@ int hpet_mask_rtc_irq_bit(unsigned long hpet_rtc_flags &= ~bit_mask; return 1; } +EXPORT_SYMBOL_GPL(hpet_mask_rtc_irq_bit); int hpet_set_rtc_irq_bit(unsigned long bit_mask) { @@ -562,6 +598,7 @@ int hpet_set_rtc_irq_bit(unsigned long b return 1; } +EXPORT_SYMBOL_GPL(hpet_set_rtc_irq_bit); int hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec) @@ -575,6 +612,7 @@ int hpet_set_alarm_time(unsigned char hr return 1; } +EXPORT_SYMBOL_GPL(hpet_set_alarm_time); int hpet_set_periodic_freq(unsigned long freq) { @@ -593,11 +631,13 @@ int hpet_set_periodic_freq(unsigned long } return 1; } +EXPORT_SYMBOL_GPL(hpet_set_periodic_freq); int hpet_rtc_dropped_irq(void) { return is_hpet_enabled(); } +EXPORT_SYMBOL_GPL(hpet_rtc_dropped_irq); static void hpet_rtc_timer_reinit(void) { @@ -641,9 +681,10 @@ irqreturn_t hpet_rtc_interrupt(int irq, unsigned long rtc_int_flag = 0; hpet_rtc_timer_reinit(); + memset(&curr_time, 0, sizeof(struct rtc_time)); if (hpet_rtc_flags & (RTC_UIE | RTC_AIE)) - rtc_get_rtc_time(&curr_time); + get_rtc_time(&curr_time); if (hpet_rtc_flags & RTC_UIE && curr_time.tm_sec != hpet_prev_update_sec) { @@ -665,8 +706,12 @@ irqreturn_t hpet_rtc_interrupt(int irq, if (rtc_int_flag) { rtc_int_flag |= (RTC_IRQF | (RTC_NUM_INTS << 8)); + if (irq_handler) + irq_handler(rtc_int_flag, dev_id); + rtc_interrupt(rtc_int_flag, dev_id); } return IRQ_HANDLED; } +EXPORT_SYMBOL_GPL(hpet_rtc_interrupt); #endif --- a/include/asm-x86/hpet.h +++ b/include/asm-x86/hpet.h @@ -69,6 +69,7 @@ extern void force_hpet_resume(void); #include +typedef irqreturn_t (*rtc_irq_handler)(int interrupt, void *cookie); extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask); extern int hpet_set_rtc_irq_bit(unsigned long bit_mask); extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min, @@ -77,6 +78,8 @@ extern int hpet_set_periodic_freq(unsign extern int hpet_rtc_dropped_irq(void); extern int hpet_rtc_timer_init(void); extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id); +extern int hpet_register_irq_handler(rtc_irq_handler handler); +extern void hpet_unregister_irq_handler(rtc_irq_handler handler); #endif /* CONFIG_HPET_EMULATE_RTC */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/