| H A D | rtc-ds1305.c | 2 * rtc-ds1305.c -- driver for DS1305 and DS1306 SPI RTC chips
19 #include <linux/spi/ds1305.h>
80 /* trickle bits are defined in <linux/spi/ds1305.h> */
88 struct ds1305 { struct
145 struct ds1305 *ds1305 = dev_get_drvdata(dev); ds1305_alarm_irq_enable() local
150 buf[1] = ds1305->ctrl[0]; ds1305_alarm_irq_enable()
153 if (ds1305->ctrl[0] & DS1305_AEI0) ds1305_alarm_irq_enable()
161 err = spi_write_then_read(ds1305->spi, buf, sizeof(buf), NULL, 0); ds1305_alarm_irq_enable()
163 ds1305->ctrl[0] = buf[1]; ds1305_alarm_irq_enable()
176 struct ds1305 *ds1305 = dev_get_drvdata(dev); ds1305_get_time() local
184 status = spi_write_then_read(ds1305->spi, &addr, sizeof(addr), ds1305_get_time()
214 struct ds1305 *ds1305 = dev_get_drvdata(dev); ds1305_set_time() local
229 *bp++ = hour2bcd(ds1305->hr12, time->tm_hour); ds1305_set_time()
240 return spi_write_then_read(ds1305->spi, buf, sizeof(buf), ds1305_set_time()
273 * Context: caller holds rtc->ops_lock (to protect ds1305->ctrl)
277 struct ds1305 *ds1305 = dev_get_drvdata(dev); ds1305_get_alarm() local
278 struct spi_device *spi = ds1305->spi; ds1305_get_alarm()
290 ds1305->ctrl, sizeof(ds1305->ctrl)); ds1305_get_alarm()
294 alm->enabled = !!(ds1305->ctrl[0] & DS1305_AEI0); ds1305_get_alarm()
295 alm->pending = !!(ds1305->ctrl[1] & DS1305_AEI0); ds1305_get_alarm()
332 * Context: caller holds rtc->ops_lock (to protect ds1305->ctrl)
336 struct ds1305 *ds1305 = dev_get_drvdata(dev); ds1305_set_alarm() local
337 struct spi_device *spi = ds1305->spi; ds1305_set_alarm()
363 if (ds1305->ctrl[0] & DS1305_AEI0) { ds1305_set_alarm()
364 ds1305->ctrl[0] &= ~DS1305_AEI0; ds1305_set_alarm()
367 buf[1] = ds1305->ctrl[0]; ds1305_set_alarm()
368 status = spi_write_then_read(ds1305->spi, buf, 2, NULL, 0); ds1305_set_alarm()
377 buf[1 + DS1305_HOUR] = hour2bcd(ds1305->hr12, alm->time.tm_hour); ds1305_set_alarm()
390 ds1305->ctrl[0] |= DS1305_AEI0; ds1305_set_alarm()
393 buf[1] = ds1305->ctrl[0]; ds1305_set_alarm()
394 status = spi_write_then_read(ds1305->spi, buf, 2, NULL, 0); ds1305_set_alarm()
404 struct ds1305 *ds1305 = dev_get_drvdata(dev); ds1305_proc() local
409 if ((ds1305->ctrl[2] & 0xf0) == DS1305_TRICKLE_MAGIC) { ds1305_proc()
410 switch (ds1305->ctrl[2] & 0x0c) { ds1305_proc()
420 switch (ds1305->ctrl[2] & 0x03) { ds1305_proc()
457 struct ds1305 *ds1305 = container_of(work, struct ds1305, work); ds1305_work() local
458 struct mutex *lock = &ds1305->rtc->ops_lock; ds1305_work()
459 struct spi_device *spi = ds1305->spi; ds1305_work()
463 /* lock to protect ds1305->ctrl */ ds1305_work()
470 ds1305->ctrl[0] &= ~(DS1305_AEI1 | DS1305_AEI0); ds1305_work()
471 ds1305->ctrl[1] = 0; ds1305_work()
474 buf[1] = ds1305->ctrl[0]; ds1305_work()
484 if (!test_bit(FLAG_EXITING, &ds1305->flags)) ds1305_work()
487 rtc_update_irq(ds1305->rtc, 1, RTC_AF | RTC_IRQF); ds1305_work()
492 * mutex locking for ds1305->ctrl ... unlike I2C, we could issue async
497 struct ds1305 *ds1305 = p; ds1305_irq() local
500 schedule_work(&ds1305->work); ds1305_irq()
606 struct ds1305 *ds1305; ds1305_probe() local
622 ds1305 = devm_kzalloc(&spi->dev, sizeof(*ds1305), GFP_KERNEL); ds1305_probe()
623 if (!ds1305) ds1305_probe()
625 ds1305->spi = spi; ds1305_probe()
626 spi_set_drvdata(spi, ds1305); ds1305_probe()
631 ds1305->ctrl, sizeof(ds1305->ctrl)); ds1305_probe()
638 dev_dbg(&spi->dev, "ctrl %s: %3ph\n", "read", ds1305->ctrl); ds1305_probe()
645 if ((ds1305->ctrl[0] & 0x38) != 0 || (ds1305->ctrl[1] & 0xfc) != 0) { ds1305_probe()
649 if (ds1305->ctrl[2] == 0) ds1305_probe()
655 if (ds1305->ctrl[0] & DS1305_WP) { ds1305_probe()
658 ds1305->ctrl[0] &= ~DS1305_WP; ds1305_probe()
661 buf[1] = ds1305->ctrl[0]; ds1305_probe()
672 if (ds1305->ctrl[0] & DS1305_nEOSC) { ds1305_probe()
673 ds1305->ctrl[0] &= ~DS1305_nEOSC; ds1305_probe()
679 if (ds1305->ctrl[1]) { ds1305_probe()
680 ds1305->ctrl[1] = 0; ds1305_probe()
687 if (((ds1305->ctrl[2] & 0xf0) != DS1305_TRICKLE_MAGIC)) { ds1305_probe()
688 ds1305->ctrl[2] = DS1305_TRICKLE_MAGIC ds1305_probe()
696 if (!(ds1305->ctrl[0] & DS1306_1HZ)) { ds1305_probe()
697 ds1305->ctrl[0] |= DS1306_1HZ; ds1305_probe()
701 if (ds1305->ctrl[0] & DS1306_1HZ) { ds1305_probe()
702 ds1305->ctrl[0] &= ~DS1306_1HZ; ds1305_probe()
713 buf[1] = ds1305->ctrl[0]; ds1305_probe()
714 buf[2] = ds1305->ctrl[1]; ds1305_probe()
715 buf[3] = ds1305->ctrl[2]; ds1305_probe()
723 dev_dbg(&spi->dev, "ctrl %s: %3ph\n", "write", ds1305->ctrl); ds1305_probe()
735 ds1305->hr12 = (DS1305_HR_12 & value) != 0; ds1305_probe()
736 if (ds1305->hr12) ds1305_probe()
739 /* register RTC ... from here on, ds1305->ctrl needs locking */ ds1305_probe()
740 ds1305->rtc = devm_rtc_device_register(&spi->dev, "ds1305", ds1305_probe()
742 if (IS_ERR(ds1305->rtc)) { ds1305_probe()
743 status = PTR_ERR(ds1305->rtc); ds1305_probe()
755 INIT_WORK(&ds1305->work, ds1305_work); ds1305_probe()
757 0, dev_name(&ds1305->rtc->dev), ds1305); ds1305_probe()
777 struct ds1305 *ds1305 = spi_get_drvdata(spi); ds1305_remove() local
783 set_bit(FLAG_EXITING, &ds1305->flags); ds1305_remove()
784 devm_free_irq(&spi->dev, spi->irq, ds1305); ds1305_remove()
785 cancel_work_sync(&ds1305->work); ds1305_remove()
792 .driver.name = "rtc-ds1305",
803 MODULE_ALIAS("spi:rtc-ds1305");
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