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rtc: rv3029: add alarm IRQ 

Add the alarm IRQ functionality.

Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Mylène Josserand 2016-05-03 11:54:38 +02:00 committed by Alexandre Belloni
parent 38201ca3c5
commit 0ddc5b89cd
1 changed files with 93 additions and 21 deletions
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114
drivers/rtc/rtc-rv3029c2.c
View File

@ -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)