diff options
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-isl12057.c | 313 |
1 files changed, 305 insertions, 8 deletions
diff --git a/drivers/rtc/rtc-isl12057.c b/drivers/rtc/rtc-isl12057.c index 6e1fcfb5d7e6..3ec73ad7f2d8 100644 --- a/drivers/rtc/rtc-isl12057.c +++ b/drivers/rtc/rtc-isl12057.c @@ -79,8 +79,10 @@ #define ISL12057_MEM_MAP_LEN 0x10 struct isl12057_rtc_data { + struct rtc_device *rtc; struct regmap *regmap; struct mutex lock; + int irq; }; static void isl12057_rtc_regs_to_tm(struct rtc_time *tm, u8 *regs) @@ -160,14 +162,47 @@ static int isl12057_i2c_validate_chip(struct regmap *regmap) return 0; } -static int isl12057_rtc_read_time(struct device *dev, struct rtc_time *tm) +static int _isl12057_rtc_clear_alarm(struct device *dev) +{ + struct isl12057_rtc_data *data = dev_get_drvdata(dev); + int ret; + + ret = regmap_update_bits(data->regmap, ISL12057_REG_SR, + ISL12057_REG_SR_A1F, 0); + if (ret) + dev_err(dev, "%s: clearing alarm failed (%d)\n", __func__, ret); + + return ret; +} + +static int _isl12057_rtc_update_alarm(struct device *dev, int enable) +{ + struct isl12057_rtc_data *data = dev_get_drvdata(dev); + int ret; + + ret = regmap_update_bits(data->regmap, ISL12057_REG_INT, + ISL12057_REG_INT_A1IE, + enable ? ISL12057_REG_INT_A1IE : 0); + if (ret) + dev_err(dev, "%s: changing alarm interrupt flag failed (%d)\n", + __func__, ret); + + return ret; +} + +/* + * Note: as we only read from device and do not perform any update, there is + * no need for an equivalent function which would try and get driver's main + * lock. Here, it is safe for everyone if we just use regmap internal lock + * on the device when reading. + */ +static int _isl12057_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct isl12057_rtc_data *data = dev_get_drvdata(dev); u8 regs[ISL12057_RTC_SEC_LEN]; unsigned int sr; int ret; - mutex_lock(&data->lock); ret = regmap_read(data->regmap, ISL12057_REG_SR, &sr); if (ret) { dev_err(dev, "%s: unable to read oscillator status flag (%d)\n", @@ -187,8 +222,6 @@ static int isl12057_rtc_read_time(struct device *dev, struct rtc_time *tm) __func__, ret); out: - mutex_unlock(&data->lock); - if (ret) return ret; @@ -197,6 +230,168 @@ out: return rtc_valid_tm(tm); } +static int isl12057_rtc_update_alarm(struct device *dev, int enable) +{ + struct isl12057_rtc_data *data = dev_get_drvdata(dev); + int ret; + + mutex_lock(&data->lock); + ret = _isl12057_rtc_update_alarm(dev, enable); + mutex_unlock(&data->lock); + + return ret; +} + +static int isl12057_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct isl12057_rtc_data *data = dev_get_drvdata(dev); + struct rtc_time rtc_tm, *alarm_tm = &alarm->time; + unsigned long rtc_secs, alarm_secs; + u8 regs[ISL12057_A1_SEC_LEN]; + unsigned int ir; + int ret; + + mutex_lock(&data->lock); + ret = regmap_bulk_read(data->regmap, ISL12057_REG_A1_SC, regs, + ISL12057_A1_SEC_LEN); + if (ret) { + dev_err(dev, "%s: reading alarm section failed (%d)\n", + __func__, ret); + goto err_unlock; + } + + alarm_tm->tm_sec = bcd2bin(regs[0] & 0x7f); + alarm_tm->tm_min = bcd2bin(regs[1] & 0x7f); + alarm_tm->tm_hour = bcd2bin(regs[2] & 0x3f); + alarm_tm->tm_mday = bcd2bin(regs[3] & 0x3f); + alarm_tm->tm_wday = -1; + + /* + * The alarm section does not store year/month. We use the ones in rtc + * section as a basis and increment month and then year if needed to get + * alarm after current time. + */ + ret = _isl12057_rtc_read_time(dev, &rtc_tm); + if (ret) + goto err_unlock; + + alarm_tm->tm_year = rtc_tm.tm_year; + alarm_tm->tm_mon = rtc_tm.tm_mon; + + ret = rtc_tm_to_time(&rtc_tm, &rtc_secs); + if (ret) + goto err_unlock; + + ret = rtc_tm_to_time(alarm_tm, &alarm_secs); + if (ret) + goto err_unlock; + + if (alarm_secs < rtc_secs) { + if (alarm_tm->tm_mon == 11) { + alarm_tm->tm_mon = 0; + alarm_tm->tm_year += 1; + } else { + alarm_tm->tm_mon += 1; + } + } + + ret = regmap_read(data->regmap, ISL12057_REG_INT, &ir); + if (ret) { + dev_err(dev, "%s: reading alarm interrupt flag failed (%d)\n", + __func__, ret); + goto err_unlock; + } + + alarm->enabled = !!(ir & ISL12057_REG_INT_A1IE); + +err_unlock: + mutex_unlock(&data->lock); + + return ret; +} + +static int isl12057_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct isl12057_rtc_data *data = dev_get_drvdata(dev); + struct rtc_time *alarm_tm = &alarm->time; + unsigned long rtc_secs, alarm_secs; + u8 regs[ISL12057_A1_SEC_LEN]; + struct rtc_time rtc_tm; + int ret, enable = 1; + + mutex_lock(&data->lock); + ret = _isl12057_rtc_read_time(dev, &rtc_tm); + if (ret) + goto err_unlock; + + ret = rtc_tm_to_time(&rtc_tm, &rtc_secs); + if (ret) + goto err_unlock; + + ret = rtc_tm_to_time(alarm_tm, &alarm_secs); + if (ret) + goto err_unlock; + + /* If alarm time is before current time, disable the alarm */ + if (!alarm->enabled || alarm_secs <= rtc_secs) { + enable = 0; + } else { + /* + * Chip only support alarms up to one month in the future. Let's + * return an error if we get something after that limit. + * Comparison is done by incrementing rtc_tm month field by one + * and checking alarm value is still below. + */ + if (rtc_tm.tm_mon == 11) { /* handle year wrapping */ + rtc_tm.tm_mon = 0; + rtc_tm.tm_year += 1; + } else { + rtc_tm.tm_mon += 1; + } + + ret = rtc_tm_to_time(&rtc_tm, &rtc_secs); + if (ret) + goto err_unlock; + + if (alarm_secs > rtc_secs) { + dev_err(dev, "%s: max for alarm is one month (%d)\n", + __func__, ret); + ret = -EINVAL; + goto err_unlock; + } + } + + /* Disable the alarm before modifying it */ + ret = _isl12057_rtc_update_alarm(dev, 0); + if (ret < 0) { + dev_err(dev, "%s: unable to disable the alarm (%d)\n", + __func__, ret); + goto err_unlock; + } + + /* Program alarm registers */ + regs[0] = bin2bcd(alarm_tm->tm_sec) & 0x7f; + regs[1] = bin2bcd(alarm_tm->tm_min) & 0x7f; + regs[2] = bin2bcd(alarm_tm->tm_hour) & 0x3f; + regs[3] = bin2bcd(alarm_tm->tm_mday) & 0x3f; + + ret = regmap_bulk_write(data->regmap, ISL12057_REG_A1_SC, regs, + ISL12057_A1_SEC_LEN); + if (ret < 0) { + dev_err(dev, "%s: writing alarm section failed (%d)\n", + __func__, ret); + goto err_unlock; + } + + /* Enable or disable alarm */ + ret = _isl12057_rtc_update_alarm(dev, enable); + +err_unlock: + mutex_unlock(&data->lock); + + return ret; +} + static int isl12057_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct isl12057_rtc_data *data = dev_get_drvdata(dev); @@ -262,9 +457,48 @@ static int isl12057_check_rtc_status(struct device *dev, struct regmap *regmap) return 0; } +static int isl12057_rtc_alarm_irq_enable(struct device *dev, + unsigned int enable) +{ + struct isl12057_rtc_data *rtc_data = dev_get_drvdata(dev); + int ret = -ENOTTY; + + if (rtc_data->irq) + ret = isl12057_rtc_update_alarm(dev, enable); + + return ret; +} + +static irqreturn_t isl12057_rtc_interrupt(int irq, void *data) +{ + struct i2c_client *client = data; + struct isl12057_rtc_data *rtc_data = dev_get_drvdata(&client->dev); + struct rtc_device *rtc = rtc_data->rtc; + int ret, handled = IRQ_NONE; + unsigned int sr; + + ret = regmap_read(rtc_data->regmap, ISL12057_REG_SR, &sr); + if (!ret && (sr & ISL12057_REG_SR_A1F)) { + dev_dbg(&client->dev, "RTC alarm!\n"); + + rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF); + + /* Acknowledge and disable the alarm */ + _isl12057_rtc_clear_alarm(&client->dev); + _isl12057_rtc_update_alarm(&client->dev, 0); + + handled = IRQ_HANDLED; + } + + return handled; +} + static const struct rtc_class_ops rtc_ops = { - .read_time = isl12057_rtc_read_time, + .read_time = _isl12057_rtc_read_time, .set_time = isl12057_rtc_set_time, + .read_alarm = isl12057_rtc_read_alarm, + .set_alarm = isl12057_rtc_set_alarm, + .alarm_irq_enable = isl12057_rtc_alarm_irq_enable, }; static struct regmap_config isl12057_rtc_regmap_config = { @@ -277,7 +511,6 @@ static int isl12057_probe(struct i2c_client *client, { struct device *dev = &client->dev; struct isl12057_rtc_data *data; - struct rtc_device *rtc; struct regmap *regmap; int ret; @@ -310,10 +543,72 @@ static int isl12057_probe(struct i2c_client *client, data->regmap = regmap; dev_set_drvdata(dev, data); - rtc = devm_rtc_device_register(dev, DRV_NAME, &rtc_ops, THIS_MODULE); - return PTR_ERR_OR_ZERO(rtc); + if (client->irq > 0) { + ret = devm_request_threaded_irq(dev, client->irq, NULL, + isl12057_rtc_interrupt, + IRQF_SHARED|IRQF_ONESHOT, + DRV_NAME, client); + if (!ret) + data->irq = client->irq; + else + dev_err(dev, "%s: irq %d unavailable (%d)\n", __func__, + client->irq, ret); + } + + device_init_wakeup(dev, !!data->irq); + + data->rtc = devm_rtc_device_register(dev, DRV_NAME, &rtc_ops, + THIS_MODULE); + ret = PTR_ERR_OR_ZERO(data->rtc); + if (ret) { + dev_err(dev, "%s: unable to register RTC device (%d)\n", + __func__, ret); + goto err; + } + + /* We cannot support UIE mode if we do not have an IRQ line */ + if (!data->irq) + data->rtc->uie_unsupported = 1; + +err: + return ret; +} + +static int isl12057_remove(struct i2c_client *client) +{ + struct isl12057_rtc_data *rtc_data = dev_get_drvdata(&client->dev); + + if (rtc_data->irq) + device_init_wakeup(&client->dev, false); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int isl12057_rtc_suspend(struct device *dev) +{ + struct isl12057_rtc_data *rtc_data = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + return enable_irq_wake(rtc_data->irq); + + return 0; } +static int isl12057_rtc_resume(struct device *dev) +{ + struct isl12057_rtc_data *rtc_data = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + return disable_irq_wake(rtc_data->irq); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(isl12057_rtc_pm_ops, isl12057_rtc_suspend, + isl12057_rtc_resume); + #ifdef CONFIG_OF static const struct of_device_id isl12057_dt_match[] = { { .compatible = "isl,isl12057" }, @@ -331,9 +626,11 @@ static struct i2c_driver isl12057_driver = { .driver = { .name = DRV_NAME, .owner = THIS_MODULE, + .pm = &isl12057_rtc_pm_ops, .of_match_table = of_match_ptr(isl12057_dt_match), }, .probe = isl12057_probe, + .remove = isl12057_remove, .id_table = isl12057_id, }; module_i2c_driver(isl12057_driver); |