diff --git a/drivers/rtc/rtc-m41t93.c b/drivers/rtc/rtc-m41t93.c index 61e761af56ad..489bad15695d 100644 --- a/drivers/rtc/rtc-m41t93.c +++ b/drivers/rtc/rtc-m41t93.c @@ -22,6 +22,14 @@ #define M41T93_REG_DAY 5 #define M41T93_REG_MON 6 #define M41T93_REG_YEAR 7 +#define M41T93_REG_AL1_MONTH 0xa +#define M41T93_REG_AL1_DATE 0xb +#define M41T93_REG_AL1_HOUR 0xc +#define M41T93_REG_AL1_MIN 0xd +#define M41T93_REG_AL1_SEC 0xe +#define M41T93_BIT_A1IE BIT(7) +#define M41T93_BIT_ABE BIT(5) +#define M41T93_FLAG_AF1 BIT(6) #define M41T93_REG_ALM_HOUR_HT 0xc @@ -153,10 +161,107 @@ static int m41t93_get_time(struct device *dev, struct rtc_time *tm) return ret; } +static int m41t93_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct m41t93_data *m41t93 = dev_get_drvdata(dev); + int ret; + unsigned int val; + u8 alarm_vals[5] = {0}; + + ret = regmap_bulk_write(m41t93->regmap, M41T93_REG_AL1_DATE, alarm_vals, 4); + if (ret) + return ret; + + /* Set alarm values */ + alarm_vals[0] = bin2bcd(alrm->time.tm_mon + 1) & 0x1f; + alarm_vals[1] = bin2bcd(alrm->time.tm_mday) & 0x3f; + alarm_vals[2] = bin2bcd(alrm->time.tm_hour) & 0x3f; + alarm_vals[3] = bin2bcd(alrm->time.tm_min) & 0x7f; + alarm_vals[4] = bin2bcd(alrm->time.tm_sec) & 0x7f; + + if (alrm->enabled) { + /* Enable alarm IRQ generation */ + alarm_vals[0] |= M41T93_BIT_A1IE | M41T93_BIT_ABE; + } + + /* Preserve SQWE bit */ + ret = regmap_read(m41t93->regmap, M41T93_REG_AL1_MONTH, &val); + if (ret) + return ret; + + alarm_vals[0] |= val & 0x40; + + ret = regmap_bulk_write(m41t93->regmap, M41T93_REG_AL1_MONTH, + alarm_vals, sizeof(alarm_vals)); + if (ret) + return ret; + + /* Device address pointer is now at FLAG register, move it to other location + * to finish setting alarm, as recommended by the datasheet. + * We do read of AL1_MONTH register to achieve this. + */ + ret = regmap_read(m41t93->regmap, M41T93_REG_AL1_MONTH, &val); + if (ret) + return ret; + + if (bcd2bin(val & 0x1f) == (alrm->time.tm_mon & 0x1f)) + dev_notice(dev, "Alarm set successfully\n"); + + return 0; +} + +static int m41t93_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct m41t93_data *m41t93 = dev_get_drvdata(dev); + int ret; + unsigned int val; + u8 alarm_vals[5] = {0}; + + ret = regmap_bulk_read(m41t93->regmap, M41T93_REG_AL1_MONTH, + alarm_vals, sizeof(alarm_vals)); + if (ret) + return ret; + + alrm->time.tm_mon = bcd2bin(alarm_vals[0] & 0x1f) - 1; + alrm->time.tm_mday = bcd2bin(alarm_vals[1] & 0x3f); + alrm->time.tm_hour = bcd2bin(alarm_vals[2] & 0x3f); + alrm->time.tm_min = bcd2bin(alarm_vals[3] & 0x7f); + alrm->time.tm_sec = bcd2bin(alarm_vals[4] & 0x7f); + + alrm->enabled = !!(alarm_vals[0] & M41T93_BIT_A1IE); + + ret = regmap_read(m41t93->regmap, M41T93_REG_FLAGS, &val); + if (ret) + return ret; + + alrm->pending = (val & M41T93_FLAG_AF1) && alrm->enabled; + + return 0; +} + +static int m41t93_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + struct m41t93_data *m41t93 = dev_get_drvdata(dev); + unsigned int val; + int ret; + + val = enabled ? M41T93_BIT_A1IE | M41T93_BIT_ABE : 0; + + ret = regmap_update_bits(m41t93->regmap, M41T93_REG_AL1_MONTH, + M41T93_BIT_A1IE | M41T93_BIT_ABE, val); + if (ret) + return ret; + + return 0; +} + static const struct rtc_class_ops m41t93_rtc_ops = { .read_time = m41t93_get_time, .set_time = m41t93_set_time, + .set_alarm = m41t93_set_alarm, + .read_alarm = m41t93_get_alarm, + .alarm_irq_enable = m41t93_alarm_irq_enable, }; static struct spi_driver m41t93_driver;