@@ -250,6 +250,99 @@ static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
return 0;
}
+static int pcf2123_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ struct pcf2123_plat_data *pdata = dev_get_platdata(dev);
+ u8 rxbuf[4];
+ int ret;
+ unsigned int val = 0;
+
+ ret = regmap_bulk_read(pdata->map, PCF2123_REG_ALRM_MN, rxbuf,
+ sizeof(rxbuf));
+ if (ret)
+ return ret;
+
+ alm->time.tm_min = bcd2bin(rxbuf[0] & 0x7F);
+ alm->time.tm_hour = bcd2bin(rxbuf[1] & 0x3F);
+ alm->time.tm_mday = bcd2bin(rxbuf[2] & 0x3F);
+ alm->time.tm_wday = bcd2bin(rxbuf[3] & 0x07);
+
+ dev_dbg(dev, "%s: alm is %ptR\n", __func__, &alm->time);
+
+ ret = regmap_read(pdata->map, PCF2123_REG_CTRL2, &val);
+ if (ret)
+ return ret;
+
+ alm->enabled = !!(val & CTRL2_AIE);
+
+ return 0;
+}
+
+static int pcf2123_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ struct pcf2123_plat_data *pdata = dev_get_platdata(dev);
+ u8 txbuf[4];
+ int ret;
+
+ dev_dbg(dev, "%s: alm is %ptR\n", __func__, &alm->time);
+
+ /* Ensure alarm flag is clear */
+ ret = regmap_update_bits(pdata->map, PCF2123_REG_CTRL2, CTRL2_AF, 0);
+ if (ret)
+ return ret;
+
+ /* Disable alarm interrupt */
+ ret = regmap_update_bits(pdata->map, PCF2123_REG_CTRL2, CTRL2_AIE, 0);
+ if (ret)
+ return ret;
+
+ /* Set new alarm */
+ txbuf[0] = bin2bcd(alm->time.tm_min & 0x7F);
+ txbuf[1] = bin2bcd(alm->time.tm_hour & 0x3F);
+ txbuf[2] = bin2bcd(alm->time.tm_mday & 0x3F);
+ txbuf[3] = bin2bcd(alm->time.tm_wday & 0x07);
+
+ ret = regmap_bulk_write(pdata->map, PCF2123_REG_ALRM_MN, txbuf,
+ sizeof(txbuf));
+ if (ret)
+ return ret;
+
+ /* Enable alarm interrupt */
+ if (alm->enabled) {
+ ret = regmap_update_bits(pdata->map, PCF2123_REG_CTRL2,
+ CTRL2_AIE, CTRL2_AIE);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static irqreturn_t pcf2123_rtc_irq(int irq, void *dev)
+{
+ struct pcf2123_plat_data *pdata = dev_get_platdata(dev);
+ struct mutex *lock = &pdata->rtc->ops_lock;
+ unsigned int val = 0;
+ int ret = IRQ_NONE;
+
+ mutex_lock(lock);
+ regmap_read(pdata->map, PCF2123_REG_CTRL2, &val);
+
+ /* Alarm? */
+ if (val & CTRL2_AF) {
+ ret = IRQ_HANDLED;
+
+ /* Clear alarm flag */
+ regmap_update_bits(pdata->map, PCF2123_REG_CTRL2, CTRL2_AF, 0);
+
+ rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
+ }
+
+ mutex_unlock(lock);
+
+ return ret;
+}
+
static int pcf2123_reset(struct device *dev)
{
struct pcf2123_plat_data *pdata = dev_get_platdata(dev);
@@ -289,7 +382,8 @@ static const struct rtc_class_ops pcf2123_rtc_ops = {
.set_time = pcf2123_rtc_set_time,
.read_offset = pcf2123_read_offset,
.set_offset = pcf2123_set_offset,
-
+ .read_alarm = pcf2123_rtc_read_alarm,
+ .set_alarm = pcf2123_rtc_set_alarm,
};
static int pcf2123_probe(struct spi_device *spi)
@@ -297,7 +391,7 @@ static int pcf2123_probe(struct spi_device *spi)
struct rtc_device *rtc;
struct rtc_time tm;
struct pcf2123_plat_data *pdata;
- int ret;
+ int ret = 0;
pdata = devm_kzalloc(&spi->dev, sizeof(struct pcf2123_plat_data),
GFP_KERNEL);
@@ -336,6 +430,24 @@ static int pcf2123_probe(struct spi_device *spi)
pdata->rtc = rtc;
+ /* Register alarm irq */
+ if (spi->irq > 0) {
+ ret = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
+ pcf2123_rtc_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ pcf2123_driver.driver.name, &spi->dev);
+ if (!ret)
+ device_init_wakeup(&spi->dev, true);
+ else
+ dev_err(&spi->dev, "could not request irq.\n");
+ }
+
+ /* The PCF2123's alarm only has minute accuracy. Must add timer
+ * support to this driver to generate interrupts more than once
+ * per minute.
+ */
+ pdata->rtc->uie_unsupported = 1;
+
return 0;
kfree_exit:
Allows alarm to be controlled using, e.g., the RTC_WKALM_SET ioctl. Signed-off-by: Dylan Howey <Dylan.Howey@tennantco.com> --- drivers/rtc/rtc-pcf2123.c | 116 +++++++++++++++++++++++++++++++++++++- 1 file changed, 114 insertions(+), 2 deletions(-)