1 /* 2 * Generic RTC interface. 3 * This version contains the part of the user interface to the Real Time Clock 4 * service. It is used with both the legacy mc146818 and also EFI 5 * Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out 6 * from <linux/mc146818rtc.h> to this file for 2.4 kernels. 7 * 8 * Copyright (C) 1999 Hewlett-Packard Co. 9 * Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com> 10 */ 11 #ifndef _LINUX_RTC_H_ 12 #define _LINUX_RTC_H_ 13 14 /* 15 * The struct used to pass data via the following ioctl. Similar to the 16 * struct tm in <time.h>, but it needs to be here so that the kernel 17 * source is self contained, allowing cross-compiles, etc. etc. 18 */ 19 20 struct rtc_time { 21 int tm_sec; 22 int tm_min; 23 int tm_hour; 24 int tm_mday; 25 int tm_mon; 26 int tm_year; 27 int tm_wday; 28 int tm_yday; 29 int tm_isdst; 30 }; 31 32 /* 33 * This data structure is inspired by the EFI (v0.92) wakeup 34 * alarm API. 35 */ 36 struct rtc_wkalrm { 37 unsigned char enabled; /* 0 = alarm disabled, 1 = alarm enabled */ 38 unsigned char pending; /* 0 = alarm not pending, 1 = alarm pending */ 39 struct rtc_time time; /* time the alarm is set to */ 40 }; 41 42 /* 43 * Data structure to control PLL correction some better RTC feature 44 * pll_value is used to get or set current value of correction, 45 * the rest of the struct is used to query HW capabilities. 46 * This is modeled after the RTC used in Q40/Q60 computers but 47 * should be sufficiently flexible for other devices 48 * 49 * +ve pll_value means clock will run faster by 50 * pll_value*pll_posmult/pll_clock 51 * -ve pll_value means clock will run slower by 52 * pll_value*pll_negmult/pll_clock 53 */ 54 55 struct rtc_pll_info { 56 int pll_ctrl; /* placeholder for fancier control */ 57 int pll_value; /* get/set correction value */ 58 int pll_max; /* max +ve (faster) adjustment value */ 59 int pll_min; /* max -ve (slower) adjustment value */ 60 int pll_posmult; /* factor for +ve correction */ 61 int pll_negmult; /* factor for -ve correction */ 62 long pll_clock; /* base PLL frequency */ 63 }; 64 65 /* 66 * ioctl calls that are permitted to the /dev/rtc interface, if 67 * any of the RTC drivers are enabled. 68 */ 69 70 #define RTC_AIE_ON _IO('p', 0x01) /* Alarm int. enable on */ 71 #define RTC_AIE_OFF _IO('p', 0x02) /* ... off */ 72 #define RTC_UIE_ON _IO('p', 0x03) /* Update int. enable on */ 73 #define RTC_UIE_OFF _IO('p', 0x04) /* ... off */ 74 #define RTC_PIE_ON _IO('p', 0x05) /* Periodic int. enable on */ 75 #define RTC_PIE_OFF _IO('p', 0x06) /* ... off */ 76 #define RTC_WIE_ON _IO('p', 0x0f) /* Watchdog int. enable on */ 77 #define RTC_WIE_OFF _IO('p', 0x10) /* ... off */ 78 79 #define RTC_ALM_SET _IOW('p', 0x07, struct rtc_time) /* Set alarm time */ 80 #define RTC_ALM_READ _IOR('p', 0x08, struct rtc_time) /* Read alarm time */ 81 #define RTC_RD_TIME _IOR('p', 0x09, struct rtc_time) /* Read RTC time */ 82 #define RTC_SET_TIME _IOW('p', 0x0a, struct rtc_time) /* Set RTC time */ 83 #define RTC_IRQP_READ _IOR('p', 0x0b, unsigned long) /* Read IRQ rate */ 84 #define RTC_IRQP_SET _IOW('p', 0x0c, unsigned long) /* Set IRQ rate */ 85 #define RTC_EPOCH_READ _IOR('p', 0x0d, unsigned long) /* Read epoch */ 86 #define RTC_EPOCH_SET _IOW('p', 0x0e, unsigned long) /* Set epoch */ 87 88 #define RTC_WKALM_SET _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/ 89 #define RTC_WKALM_RD _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/ 90 91 #define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info) /* Get PLL correction */ 92 #define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info) /* Set PLL correction */ 93 94 #define RTC_VL_READ _IOR('p', 0x13, int) /* Voltage low detector */ 95 #define RTC_VL_CLR _IO('p', 0x14) /* Clear voltage low information */ 96 97 /* interrupt flags */ 98 #define RTC_IRQF 0x80 /* Any of the following is active */ 99 #define RTC_PF 0x40 /* Periodic interrupt */ 100 #define RTC_AF 0x20 /* Alarm interrupt */ 101 #define RTC_UF 0x10 /* Update interrupt for 1Hz RTC */ 102 103 104 #define RTC_MAX_FREQ 8192 105 106 #ifdef __KERNEL__ 107 108 #include <linux/types.h> 109 #include <linux/interrupt.h> 110 111 extern int rtc_month_days(unsigned int month, unsigned int year); 112 extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year); 113 extern int rtc_valid_tm(struct rtc_time *tm); 114 extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time); 115 extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm); 116 ktime_t rtc_tm_to_ktime(struct rtc_time tm); 117 struct rtc_time rtc_ktime_to_tm(ktime_t kt); 118 119 120 #include <linux/device.h> 121 #include <linux/seq_file.h> 122 #include <linux/cdev.h> 123 #include <linux/poll.h> 124 #include <linux/mutex.h> 125 #include <linux/timerqueue.h> 126 #include <linux/workqueue.h> 127 128 extern struct class *rtc_class; 129 130 /* 131 * For these RTC methods the device parameter is the physical device 132 * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which 133 * was passed to rtc_device_register(). Its driver_data normally holds 134 * device state, including the rtc_device pointer for the RTC. 135 * 136 * Most of these methods are called with rtc_device.ops_lock held, 137 * through the rtc_*(struct rtc_device *, ...) calls. 138 * 139 * The (current) exceptions are mostly filesystem hooks: 140 * - the proc() hook for procfs 141 * - non-ioctl() chardev hooks: open(), release(), read_callback() 142 * 143 * REVISIT those periodic irq calls *do* have ops_lock when they're 144 * issued through ioctl() ... 145 */ 146 struct rtc_class_ops { 147 int (*open)(struct device *); 148 void (*release)(struct device *); 149 int (*ioctl)(struct device *, unsigned int, unsigned long); 150 int (*read_time)(struct device *, struct rtc_time *); 151 int (*set_time)(struct device *, struct rtc_time *); 152 int (*read_alarm)(struct device *, struct rtc_wkalrm *); 153 int (*set_alarm)(struct device *, struct rtc_wkalrm *); 154 int (*proc)(struct device *, struct seq_file *); 155 int (*set_mmss)(struct device *, unsigned long secs); 156 int (*read_callback)(struct device *, int data); 157 int (*alarm_irq_enable)(struct device *, unsigned int enabled); 158 }; 159 160 #define RTC_DEVICE_NAME_SIZE 20 161 typedef struct rtc_task { 162 void (*func)(void *private_data); 163 void *private_data; 164 } rtc_task_t; 165 166 167 struct rtc_timer { 168 struct rtc_task task; 169 struct timerqueue_node node; 170 ktime_t period; 171 int enabled; 172 }; 173 174 175 /* flags */ 176 #define RTC_DEV_BUSY 0 177 178 struct rtc_device 179 { 180 struct device dev; 181 struct module *owner; 182 183 int id; 184 char name[RTC_DEVICE_NAME_SIZE]; 185 186 const struct rtc_class_ops *ops; 187 struct mutex ops_lock; 188 189 struct cdev char_dev; 190 unsigned long flags; 191 192 unsigned long irq_data; 193 spinlock_t irq_lock; 194 wait_queue_head_t irq_queue; 195 struct fasync_struct *async_queue; 196 197 struct rtc_task *irq_task; 198 spinlock_t irq_task_lock; 199 int irq_freq; 200 int max_user_freq; 201 202 struct timerqueue_head timerqueue; 203 struct rtc_timer aie_timer; 204 struct rtc_timer uie_rtctimer; 205 struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */ 206 int pie_enabled; 207 struct work_struct irqwork; 208 /* Some hardware can't support UIE mode */ 209 int uie_unsupported; 210 211 #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL 212 struct work_struct uie_task; 213 struct timer_list uie_timer; 214 /* Those fields are protected by rtc->irq_lock */ 215 unsigned int oldsecs; 216 unsigned int uie_irq_active:1; 217 unsigned int stop_uie_polling:1; 218 unsigned int uie_task_active:1; 219 unsigned int uie_timer_active:1; 220 #endif 221 }; 222 #define to_rtc_device(d) container_of(d, struct rtc_device, dev) 223 224 extern struct rtc_device *rtc_device_register(const char *name, 225 struct device *dev, 226 const struct rtc_class_ops *ops, 227 struct module *owner); 228 extern void rtc_device_unregister(struct rtc_device *rtc); 229 230 extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm); 231 extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm); 232 extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs); 233 int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm); 234 extern int rtc_read_alarm(struct rtc_device *rtc, 235 struct rtc_wkalrm *alrm); 236 extern int rtc_set_alarm(struct rtc_device *rtc, 237 struct rtc_wkalrm *alrm); 238 extern int rtc_initialize_alarm(struct rtc_device *rtc, 239 struct rtc_wkalrm *alrm); 240 extern void rtc_update_irq(struct rtc_device *rtc, 241 unsigned long num, unsigned long events); 242 243 extern struct rtc_device *rtc_class_open(char *name); 244 extern void rtc_class_close(struct rtc_device *rtc); 245 246 extern int rtc_irq_register(struct rtc_device *rtc, 247 struct rtc_task *task); 248 extern void rtc_irq_unregister(struct rtc_device *rtc, 249 struct rtc_task *task); 250 extern int rtc_irq_set_state(struct rtc_device *rtc, 251 struct rtc_task *task, int enabled); 252 extern int rtc_irq_set_freq(struct rtc_device *rtc, 253 struct rtc_task *task, int freq); 254 extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled); 255 extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled); 256 extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc, 257 unsigned int enabled); 258 259 void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode); 260 void rtc_aie_update_irq(void *private); 261 void rtc_uie_update_irq(void *private); 262 enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer); 263 264 int rtc_register(rtc_task_t *task); 265 int rtc_unregister(rtc_task_t *task); 266 int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg); 267 268 void rtc_timer_init(struct rtc_timer *timer, void (*f)(void* p), void* data); 269 int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer* timer, 270 ktime_t expires, ktime_t period); 271 int rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer* timer); 272 void rtc_timer_do_work(struct work_struct *work); 273 274 static inline bool is_leap_year(unsigned int year) 275 { 276 return (!(year % 4) && (year % 100)) || !(year % 400); 277 } 278 279 #ifdef CONFIG_RTC_HCTOSYS 280 extern int rtc_hctosys_ret; 281 #else 282 #define rtc_hctosys_ret -ENODEV 283 #endif 284 285 #endif /* __KERNEL__ */ 286 287 #endif /* _LINUX_RTC_H_ */ 288