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rtc: ab-eoz9: add alarm support 

Add alarm support for the rtc-ab-eoz9.

Signed-off-by: Liam Beguin <lvb@xiphos.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210408024028.3526564-3-liambeguin@gmail.com
This commit is contained in:
Liam Beguin 2021-04-07 22:40:27 -04:00 committed by Alexandre Belloni
parent f1d304766c
commit e70e52e1bf
1 changed files with 136 additions and 0 deletions
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136
drivers/rtc/rtc-ab-eoz9.c
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@ -11,6 +11,7 @@
#include <linux/bcd.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/bitfield.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
@ -57,6 +58,24 @@
#define ABEOZ9_SEC_LEN 7
#define ABEOZ9_REG_ALARM_SEC 0x10
#define ABEOZ9_BIT_ALARM_SEC GENMASK(6, 0)
#define ABEOZ9_REG_ALARM_MIN 0x11
#define ABEOZ9_BIT_ALARM_MIN GENMASK(6, 0)
#define ABEOZ9_REG_ALARM_HOURS 0x12
#define ABEOZ9_BIT_ALARM_HOURS_PM BIT(5)
#define ABEOZ9_BIT_ALARM_HOURS GENMASK(4, 0)
#define ABEOZ9_REG_ALARM_DAYS 0x13
#define ABEOZ9_BIT_ALARM_DAYS GENMASK(5, 0)
#define ABEOZ9_REG_ALARM_WEEKDAYS 0x14
#define ABEOZ9_BIT_ALARM_WEEKDAYS GENMASK(2, 0)
#define ABEOZ9_REG_ALARM_MONTHS 0x15
#define ABEOZ9_BIT_ALARM_MONTHS GENMASK(4, 0)
#define ABEOZ9_REG_ALARM_YEARS 0x16
#define ABEOZ9_ALARM_LEN 7
#define ABEOZ9_BIT_ALARM_AE BIT(7)
#define ABEOZ9_REG_REG_TEMP 0x20
#define ABEOZ953_TEMP_MAX 120
#define ABEOZ953_TEMP_MIN -60
@ -186,6 +205,98 @@ static int abeoz9_rtc_set_time(struct device *dev, struct rtc_time *tm)
return abeoz9_reset_validity(regmap);
}
static int abeoz9_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
struct regmap *regmap = data->regmap;
u8 regs[ABEOZ9_ALARM_LEN];
u8 val[2];
int ret;
ret = abeoz9_check_validity(dev);
if (ret)
return ret;
ret = regmap_bulk_read(regmap, ABEOZ9_REG_CTRL_INT, val, sizeof(val));
if (ret)
return ret;
alarm->enabled = val[0] & ABEOZ9_REG_CTRL_INT_AIE;
alarm->pending = val[1] & ABEOZ9_REG_CTRL_INT_FLAG_AF;
ret = regmap_bulk_read(regmap, ABEOZ9_REG_ALARM_SEC, regs, sizeof(regs));
if (ret)
return ret;
alarm->time.tm_sec = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_SEC, regs[0]));
alarm->time.tm_min = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_MIN, regs[1]));
alarm->time.tm_hour = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_HOURS, regs[2]));
if (FIELD_GET(ABEOZ9_BIT_ALARM_HOURS_PM, regs[2]))
alarm->time.tm_hour += 12;
alarm->time.tm_mday = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_DAYS, regs[3]));
return 0;
}
static int abeoz9_rtc_alarm_irq_enable(struct device *dev, u32 enable)
{
struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
return regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT,
ABEOZ9_REG_CTRL_INT_AIE,
FIELD_PREP(ABEOZ9_REG_CTRL_INT_AIE, enable));
}
static int abeoz9_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
u8 regs[ABEOZ9_ALARM_LEN] = {0};
int ret;
ret = regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG,
ABEOZ9_REG_CTRL_INT_FLAG_AF, 0);
if (ret)
return ret;
regs[0] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_SEC,
bin2bcd(alarm->time.tm_sec));
regs[1] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_MIN,
bin2bcd(alarm->time.tm_min));
regs[2] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_HOURS,
bin2bcd(alarm->time.tm_hour));
regs[3] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_DAYS,
bin2bcd(alarm->time.tm_mday));
ret = regmap_bulk_write(data->regmap, ABEOZ9_REG_ALARM_SEC, regs,
sizeof(regs));
if (ret)
return ret;
return abeoz9_rtc_alarm_irq_enable(dev, alarm->enabled);
}
static irqreturn_t abeoz9_rtc_irq(int irq, void *dev)
{
struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
unsigned int val;
int ret;
ret = regmap_read(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG, &val);
if (ret)
return IRQ_NONE;
if (!FIELD_GET(ABEOZ9_REG_CTRL_INT_FLAG_AF, val))
return IRQ_NONE;
regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG,
ABEOZ9_REG_CTRL_INT_FLAG_AF, 0);
rtc_update_irq(data->rtc, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;
}
static int abeoz9_trickle_parse_dt(struct device_node *node)
{
u32 ohms = 0;
@ -261,6 +372,14 @@ static const struct rtc_class_ops rtc_ops = {
.set_time = abeoz9_rtc_set_time,
};
static const struct rtc_class_ops rtc_alarm_ops = {
.read_time = abeoz9_rtc_get_time,
.set_time = abeoz9_rtc_set_time,
.read_alarm = abeoz9_rtc_read_alarm,
.set_alarm = abeoz9_rtc_set_alarm,
.alarm_irq_enable = abeoz9_rtc_alarm_irq_enable,
};
static const struct regmap_config abeoz9_rtc_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
@ -420,6 +539,23 @@ static int abeoz9_probe(struct i2c_client *client,
data->rtc->ops = &rtc_ops;
data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
data->rtc->range_max = RTC_TIMESTAMP_END_2099;
data->rtc->uie_unsupported = 1;
if (client->irq > 0) {
ret = devm_request_threaded_irq(dev, client->irq, NULL,
abeoz9_rtc_irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
dev_name(dev), dev);
if (ret) {
dev_err(dev, "failed to request alarm irq\n");
return ret;
}
}
if (client->irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
ret = device_init_wakeup(dev, true);
data->rtc->ops = &rtc_alarm_ops;
}
ret = devm_rtc_register_device(data->rtc);
if (ret)