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Subject[PATCH 6/6] rtc: rv3029: add alarm IRQ
Date
Add the alarm IRQ functionality.

Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com>
---
drivers/rtc/rtc-rv3029c2.c | 114 ++++++++++++++++++++++++++++++++++++---------
1 file changed, 93 insertions(+), 21 deletions(-)

diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c
index 42de1a3..152ca9d 100644
--- a/drivers/rtc/rtc-rv3029c2.c
+++ b/drivers/rtc/rtc-rv3029c2.c
@@ -329,6 +329,47 @@ static int rv3029_eeprom_update_bits(struct device *dev,
return 0;
}

+static irqreturn_t rv3029_handle_irq(int irq, void *dev_id)
+{
+ struct device *dev = dev_id;
+ struct rv3029_data *rv3029 = dev_get_drvdata(dev);
+ struct mutex *lock = &rv3029->rtc->ops_lock;
+ unsigned long events = 0;
+ u8 flags, controls;
+ int ret;
+
+ mutex_lock(lock);
+
+ ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
+ if (ret) {
+ dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
+ mutex_unlock(lock);
+ return IRQ_NONE;
+ }
+
+ ret = rv3029_read_regs(dev, RV3029_IRQ_FLAGS, &flags, 1);
+ if (ret) {
+ dev_warn(dev, "Read IRQ Flags Register error %d\n", ret);
+ mutex_unlock(lock);
+ return IRQ_NONE;
+ }
+
+ if (flags & RV3029_IRQ_FLAGS_AF) {
+ flags &= ~RV3029_IRQ_FLAGS_AF;
+ controls &= ~RV3029_IRQ_CTRL_AIE;
+ events |= RTC_AF;
+ }
+
+ if (events) {
+ rtc_update_irq(rv3029->rtc, 1, events);
+ rv3029_write_regs(dev, RV3029_IRQ_FLAGS, &flags, 1);
+ rv3029_write_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
+ }
+ mutex_unlock(lock);
+
+ return IRQ_HANDLED;
+}
+
static int rv3029_read_time(struct device *dev, struct rtc_time *tm)
{
u8 buf[1];
@@ -376,7 +417,7 @@ static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct rtc_time *const tm = &alarm->time;
int ret;
- u8 regs[8];
+ u8 regs[8], controls, flags;

ret = rv3029_get_sr(dev, regs);
if (ret < 0) {
@@ -392,6 +433,17 @@ static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
return ret;
}

+ ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
+ if (ret) {
+ dev_err(dev, "Read IRQ Control Register error %d\n", ret);
+ return ret;
+ }
+ ret = rv3029_read_regs(dev, RV3029_IRQ_FLAGS, &flags, 1);
+ if (ret < 0) {
+ dev_err(dev, "Read IRQ Flags Register error %d\n", ret);
+ return ret;
+ }
+
tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f);
tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f);
tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f);
@@ -400,16 +452,30 @@ static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100;
tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1;

+ alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE);
+ alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled;
+
return 0;
}

-static int rv3029_rtc_alarm_set_irq(struct device *dev, int enable)
+static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable)
{
int ret;
+ u8 controls;
+
+ ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
+ if (ret < 0) {
+ dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
+ return ret;
+ }

/* enable/disable AIE irq */
- ret = rv3029_update_bits(dev, RV3029_IRQ_CTRL, RV3029_IRQ_CTRL_AIE,
- (enable ? RV3029_IRQ_CTRL_AIE : 0));
+ if (enable)
+ controls |= RV3029_IRQ_CTRL_AIE;
+ else
+ controls &= ~RV3029_IRQ_CTRL_AIE;
+
+ ret = rv3029_write_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
if (ret < 0) {
dev_err(dev, "can't update INT reg\n");
return ret;
@@ -459,26 +525,15 @@ static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
return ret;

if (alarm->enabled) {
- /* clear AF flag */
- ret = rv3029_update_bits(dev, RV3029_IRQ_FLAGS,
- RV3029_IRQ_FLAGS_AF, 0);
- if (ret < 0) {
- dev_err(dev, "can't clear alarm flag\n");
- return ret;
- }
/* enable AIE irq */
- ret = rv3029_rtc_alarm_set_irq(dev, 1);
+ ret = rv3029_alarm_irq_enable(dev, 1);
if (ret)
return ret;
-
- dev_dbg(dev, "alarm IRQ armed\n");
} else {
/* disable AIE irq */
- ret = rv3029_rtc_alarm_set_irq(dev, 0);
+ ret = rv3029_alarm_irq_enable(dev, 0);
if (ret)
return ret;
-
- dev_dbg(dev, "alarm IRQ disabled\n");
}

return 0;
@@ -731,11 +786,9 @@ static void rv3029_hwmon_register(struct device *dev, const char *name)

#endif /* CONFIG_RTC_DRV_RV3029_HWMON */

-static const struct rtc_class_ops rv3029_rtc_ops = {
+static struct rtc_class_ops rv3029_rtc_ops = {
.read_time = rv3029_read_time,
.set_time = rv3029_set_time,
- .read_alarm = rv3029_read_alarm,
- .set_alarm = rv3029_set_alarm,
};

static struct i2c_device_id rv3029_id[] = {
@@ -772,8 +825,27 @@ static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,

rv3029->rtc = devm_rtc_device_register(dev, name, &rv3029_rtc_ops,
THIS_MODULE);
+ if (IS_ERR(rv3029->rtc)) {
+ dev_err(dev, "unable to register the class device\n");
+ return PTR_ERR(rv3029->rtc);
+ }

- return PTR_ERR_OR_ZERO(rv3029->rtc);
+ if (rv3029->irq > 0) {
+ rc = devm_request_threaded_irq(dev, rv3029->irq,
+ NULL, rv3029_handle_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "rv3029", dev);
+ if (rc) {
+ dev_warn(dev, "unable to request IRQ, alarms disabled\n");
+ rv3029->irq = 0;
+ } else {
+ rv3029_rtc_ops.read_alarm = rv3029_read_alarm;
+ rv3029_rtc_ops.set_alarm = rv3029_set_alarm;
+ rv3029_rtc_ops.alarm_irq_enable = rv3029_alarm_irq_enable;
+ }
+ }
+
+ return 0;
}

#if IS_ENABLED(CONFIG_I2C)
--
2.8.0.rc3
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