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rtc: pcf85363: add alarm support
Handle alarms, currently only on INTA Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni
parent
c57849dde0
commit
e5aac267a1
@ -73,6 +73,39 @@
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#define CTRL_RESETS 0x2f
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#define CTRL_RAM 0x40
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#define ALRM_SEC_A1E BIT(0)
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#define ALRM_MIN_A1E BIT(1)
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#define ALRM_HR_A1E BIT(2)
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#define ALRM_DAY_A1E BIT(3)
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#define ALRM_MON_A1E BIT(4)
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#define ALRM_MIN_A2E BIT(5)
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#define ALRM_HR_A2E BIT(6)
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#define ALRM_DAY_A2E BIT(7)
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#define INT_WDIE BIT(0)
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#define INT_BSIE BIT(1)
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#define INT_TSRIE BIT(2)
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#define INT_A2IE BIT(3)
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#define INT_A1IE BIT(4)
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#define INT_OIE BIT(5)
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#define INT_PIE BIT(6)
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#define INT_ILP BIT(7)
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#define FLAGS_TSR1F BIT(0)
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#define FLAGS_TSR2F BIT(1)
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#define FLAGS_TSR3F BIT(2)
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#define FLAGS_BSF BIT(3)
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#define FLAGS_WDF BIT(4)
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#define FLAGS_A1F BIT(5)
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#define FLAGS_A2F BIT(6)
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#define FLAGS_PIF BIT(7)
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#define PIN_IO_INTAPM GENMASK(1, 0)
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#define PIN_IO_INTA_CLK 0
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#define PIN_IO_INTA_BAT 1
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#define PIN_IO_INTA_OUT 2
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#define PIN_IO_INTA_HIZ 3
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#define NVRAM_SIZE 0x40
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static struct i2c_driver pcf85363_driver;
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@ -131,11 +164,123 @@ static int pcf85363_rtc_set_time(struct device *dev, struct rtc_time *tm)
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buf, len);
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}
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static int pcf85363_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
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unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
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unsigned int val;
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int ret;
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ret = regmap_bulk_read(pcf85363->regmap, DT_SECOND_ALM1, buf,
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sizeof(buf));
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if (ret)
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return ret;
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alrm->time.tm_sec = bcd2bin(buf[0]);
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alrm->time.tm_min = bcd2bin(buf[1]);
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alrm->time.tm_hour = bcd2bin(buf[2]);
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alrm->time.tm_mday = bcd2bin(buf[3]);
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alrm->time.tm_mon = bcd2bin(buf[4]) - 1;
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ret = regmap_read(pcf85363->regmap, CTRL_INTA_EN, &val);
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if (ret)
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return ret;
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alrm->enabled = !!(val & INT_A1IE);
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return 0;
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}
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static int _pcf85363_rtc_alarm_irq_enable(struct pcf85363 *pcf85363, unsigned
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int enabled)
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{
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unsigned int alarm_flags = ALRM_SEC_A1E | ALRM_MIN_A1E | ALRM_HR_A1E |
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ALRM_DAY_A1E | ALRM_MON_A1E;
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int ret;
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ret = regmap_update_bits(pcf85363->regmap, DT_ALARM_EN, alarm_flags,
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enabled ? alarm_flags : 0);
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if (ret)
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return ret;
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ret = regmap_update_bits(pcf85363->regmap, CTRL_INTA_EN,
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INT_A1IE, enabled ? INT_A1IE : 0);
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if (ret || enabled)
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return ret;
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/* clear current flags */
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return regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
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}
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static int pcf85363_rtc_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
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return _pcf85363_rtc_alarm_irq_enable(pcf85363, enabled);
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}
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static int pcf85363_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
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unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
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int ret;
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buf[0] = bin2bcd(alrm->time.tm_sec);
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buf[1] = bin2bcd(alrm->time.tm_min);
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buf[2] = bin2bcd(alrm->time.tm_hour);
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buf[3] = bin2bcd(alrm->time.tm_mday);
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buf[4] = bin2bcd(alrm->time.tm_mon + 1);
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/*
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* Disable the alarm interrupt before changing the value to avoid
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* spurious interrupts
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*/
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ret = _pcf85363_rtc_alarm_irq_enable(pcf85363, 0);
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if (ret)
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return ret;
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ret = regmap_bulk_write(pcf85363->regmap, DT_SECOND_ALM1, buf,
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sizeof(buf));
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if (ret)
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return ret;
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return _pcf85363_rtc_alarm_irq_enable(pcf85363, alrm->enabled);
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}
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static irqreturn_t pcf85363_rtc_handle_irq(int irq, void *dev_id)
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{
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struct pcf85363 *pcf85363 = i2c_get_clientdata(dev_id);
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unsigned int flags;
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int err;
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err = regmap_read(pcf85363->regmap, CTRL_FLAGS, &flags);
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if (err)
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return IRQ_NONE;
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if (flags & FLAGS_A1F) {
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rtc_update_irq(pcf85363->rtc, 1, RTC_IRQF | RTC_AF);
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regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static const struct rtc_class_ops rtc_ops = {
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.read_time = pcf85363_rtc_read_time,
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.set_time = pcf85363_rtc_set_time,
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};
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static const struct rtc_class_ops rtc_ops_alarm = {
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.read_time = pcf85363_rtc_read_time,
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.set_time = pcf85363_rtc_set_time,
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.read_alarm = pcf85363_rtc_read_alarm,
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.set_alarm = pcf85363_rtc_set_alarm,
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.alarm_irq_enable = pcf85363_rtc_alarm_irq_enable,
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};
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static int pcf85363_nvram_read(void *priv, unsigned int offset, void *val,
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size_t bytes)
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{
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@ -197,6 +342,20 @@ static int pcf85363_probe(struct i2c_client *client,
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pcf85363->rtc->ops = &rtc_ops;
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if (client->irq > 0) {
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regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
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regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
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PIN_IO_INTA_OUT, PIN_IO_INTAPM);
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ret = devm_request_threaded_irq(pcf85363->dev, client->irq,
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NULL, pcf85363_rtc_handle_irq,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"pcf85363", client);
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if (ret)
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dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
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else
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pcf85363->rtc->ops = &rtc_ops_alarm;
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}
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ret = rtc_register_device(pcf85363->rtc);
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nvmem_cfg.priv = pcf85363;
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