mirrors/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2025-11-03 18:20:25 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

rtc: pcf85363: add alarm support

Browse source 
Handle alarms, currently only on INTA

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2018-03-01 01:42:19 +01:00
parent c57849dde0
commit e5aac267a1
1 changed files with 159 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

159
drivers/rtc/rtc-pcf85363.c
View file

@ -73,6 +73,39 @@
#define CTRL_RESETS 0x2f
#define CTRL_RAM 0x40
#define ALRM_SEC_A1E BIT(0)
#define ALRM_MIN_A1E BIT(1)
#define ALRM_HR_A1E BIT(2)
#define ALRM_DAY_A1E BIT(3)
#define ALRM_MON_A1E BIT(4)
#define ALRM_MIN_A2E BIT(5)
#define ALRM_HR_A2E BIT(6)
#define ALRM_DAY_A2E BIT(7)
#define INT_WDIE BIT(0)
#define INT_BSIE BIT(1)
#define INT_TSRIE BIT(2)
#define INT_A2IE BIT(3)
#define INT_A1IE BIT(4)
#define INT_OIE BIT(5)
#define INT_PIE BIT(6)
#define INT_ILP BIT(7)
#define FLAGS_TSR1F BIT(0)
#define FLAGS_TSR2F BIT(1)
#define FLAGS_TSR3F BIT(2)
#define FLAGS_BSF BIT(3)
#define FLAGS_WDF BIT(4)
#define FLAGS_A1F BIT(5)
#define FLAGS_A2F BIT(6)
#define FLAGS_PIF BIT(7)
#define PIN_IO_INTAPM GENMASK(1, 0)
#define PIN_IO_INTA_CLK 0
#define PIN_IO_INTA_BAT 1
#define PIN_IO_INTA_OUT 2
#define PIN_IO_INTA_HIZ 3
#define NVRAM_SIZE 0x40
static struct i2c_driver pcf85363_driver;
@ -131,11 +164,123 @@ static int pcf85363_rtc_set_time(struct device *dev, struct rtc_time *tm)
buf, len);
}
static int pcf85363_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
unsigned int val;
int ret;
ret = regmap_bulk_read(pcf85363->regmap, DT_SECOND_ALM1, buf,
sizeof(buf));
if (ret)
return ret;
alrm->time.tm_sec = bcd2bin(buf[0]);
alrm->time.tm_min = bcd2bin(buf[1]);
alrm->time.tm_hour = bcd2bin(buf[2]);
alrm->time.tm_mday = bcd2bin(buf[3]);
alrm->time.tm_mon = bcd2bin(buf[4]) - 1;
ret = regmap_read(pcf85363->regmap, CTRL_INTA_EN, &val);
if (ret)
return ret;
alrm->enabled = !!(val & INT_A1IE);
return 0;
}
static int _pcf85363_rtc_alarm_irq_enable(struct pcf85363 *pcf85363, unsigned
int enabled)
{
unsigned int alarm_flags = ALRM_SEC_A1E | ALRM_MIN_A1E | ALRM_HR_A1E |
ALRM_DAY_A1E | ALRM_MON_A1E;
int ret;
ret = regmap_update_bits(pcf85363->regmap, DT_ALARM_EN, alarm_flags,
enabled ? alarm_flags : 0);
if (ret)
return ret;
ret = regmap_update_bits(pcf85363->regmap, CTRL_INTA_EN,
INT_A1IE, enabled ? INT_A1IE : 0);
if (ret || enabled)
return ret;
/* clear current flags */
return regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
}
static int pcf85363_rtc_alarm_irq_enable(struct device *dev,
unsigned int enabled)
{
struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
return _pcf85363_rtc_alarm_irq_enable(pcf85363, enabled);
}
static int pcf85363_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
int ret;
buf[0] = bin2bcd(alrm->time.tm_sec);
buf[1] = bin2bcd(alrm->time.tm_min);
buf[2] = bin2bcd(alrm->time.tm_hour);
buf[3] = bin2bcd(alrm->time.tm_mday);
buf[4] = bin2bcd(alrm->time.tm_mon + 1);
/*
* Disable the alarm interrupt before changing the value to avoid
* spurious interrupts
*/
ret = _pcf85363_rtc_alarm_irq_enable(pcf85363, 0);
if (ret)
return ret;
ret = regmap_bulk_write(pcf85363->regmap, DT_SECOND_ALM1, buf,
sizeof(buf));
if (ret)
return ret;
return _pcf85363_rtc_alarm_irq_enable(pcf85363, alrm->enabled);
}
static irqreturn_t pcf85363_rtc_handle_irq(int irq, void *dev_id)
{
struct pcf85363 *pcf85363 = i2c_get_clientdata(dev_id);
unsigned int flags;
int err;
err = regmap_read(pcf85363->regmap, CTRL_FLAGS, &flags);
if (err)
return IRQ_NONE;
if (flags & FLAGS_A1F) {
rtc_update_irq(pcf85363->rtc, 1, RTC_IRQF | RTC_AF);
regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static const struct rtc_class_ops rtc_ops = {
.read_time = pcf85363_rtc_read_time,
.set_time = pcf85363_rtc_set_time,
};
static const struct rtc_class_ops rtc_ops_alarm = {
.read_time = pcf85363_rtc_read_time,
.set_time = pcf85363_rtc_set_time,
.read_alarm = pcf85363_rtc_read_alarm,
.set_alarm = pcf85363_rtc_set_alarm,
.alarm_irq_enable = pcf85363_rtc_alarm_irq_enable,
};
static int pcf85363_nvram_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
@ -197,6 +342,20 @@ static int pcf85363_probe(struct i2c_client *client,
pcf85363->rtc->ops = &rtc_ops;
if (client->irq > 0) {
regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
PIN_IO_INTA_OUT, PIN_IO_INTAPM);
ret = devm_request_threaded_irq(pcf85363->dev, client->irq,
NULL, pcf85363_rtc_handle_irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"pcf85363", client);
if (ret)
dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
else
pcf85363->rtc->ops = &rtc_ops_alarm;
}
ret = rtc_register_device(pcf85363->rtc);
nvmem_cfg.priv = pcf85363;