aboutsummaryrefslogtreecommitdiff
path: root/drivers/rtc
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/interface.c102
-rw-r--r--drivers/rtc/rtc-fm3130.c2
-rw-r--r--drivers/rtc/rtc-pcf8563.c1
-rw-r--r--drivers/rtc/rtc-sa1100.c4
-rw-r--r--drivers/rtc/rtc-x1205.c111
5 files changed, 186 insertions, 34 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 7e3ad4f3b34..58b7336640f 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -126,12 +126,25 @@ int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
int err;
struct rtc_time before, now;
int first_time = 1;
+ unsigned long t_now, t_alm;
+ enum { none, day, month, year } missing = none;
+ unsigned days;
- /* The lower level RTC driver may not be capable of filling
- * in all fields of the rtc_time struct (eg. rtc-cmos),
- * and so might instead return -1 in some fields.
- * We deal with that here by grabbing a current RTC timestamp
- * and using values from that for any missing (-1) values.
+ /* The lower level RTC driver may return -1 in some fields,
+ * creating invalid alarm->time values, for reasons like:
+ *
+ * - The hardware may not be capable of filling them in;
+ * many alarms match only on time-of-day fields, not
+ * day/month/year calendar data.
+ *
+ * - Some hardware uses illegal values as "wildcard" match
+ * values, which non-Linux firmware (like a BIOS) may try
+ * to set up as e.g. "alarm 15 minutes after each hour".
+ * Linux uses only oneshot alarms.
+ *
+ * When we see that here, we deal with it by using values from
+ * a current RTC timestamp for any missing (-1) values. The
+ * RTC driver prevents "periodic alarm" modes.
*
* But this can be racey, because some fields of the RTC timestamp
* may have wrapped in the interval since we read the RTC alarm,
@@ -174,6 +187,10 @@ int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
if (!alarm->enabled)
return 0;
+ /* full-function RTCs won't have such missing fields */
+ if (rtc_valid_tm(&alarm->time) == 0)
+ return 0;
+
/* get the "after" timestamp, to detect wrapped fields */
err = rtc_read_time(rtc, &now);
if (err < 0)
@@ -183,22 +200,85 @@ int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
} while ( before.tm_min != now.tm_min
|| before.tm_hour != now.tm_hour
|| before.tm_mon != now.tm_mon
- || before.tm_year != now.tm_year
- || before.tm_isdst != now.tm_isdst);
+ || before.tm_year != now.tm_year);
- /* Fill in any missing alarm fields using the timestamp */
+ /* Fill in the missing alarm fields using the timestamp; we
+ * know there's at least one since alarm->time is invalid.
+ */
if (alarm->time.tm_sec == -1)
alarm->time.tm_sec = now.tm_sec;
if (alarm->time.tm_min == -1)
alarm->time.tm_min = now.tm_min;
if (alarm->time.tm_hour == -1)
alarm->time.tm_hour = now.tm_hour;
- if (alarm->time.tm_mday == -1)
+
+ /* For simplicity, only support date rollover for now */
+ if (alarm->time.tm_mday == -1) {
alarm->time.tm_mday = now.tm_mday;
- if (alarm->time.tm_mon == -1)
+ missing = day;
+ }
+ if (alarm->time.tm_mon == -1) {
alarm->time.tm_mon = now.tm_mon;
- if (alarm->time.tm_year == -1)
+ if (missing == none)
+ missing = month;
+ }
+ if (alarm->time.tm_year == -1) {
alarm->time.tm_year = now.tm_year;
+ if (missing == none)
+ missing = year;
+ }
+
+ /* with luck, no rollover is needed */
+ rtc_tm_to_time(&now, &t_now);
+ rtc_tm_to_time(&alarm->time, &t_alm);
+ if (t_now < t_alm)
+ goto done;
+
+ switch (missing) {
+
+ /* 24 hour rollover ... if it's now 10am Monday, an alarm that
+ * that will trigger at 5am will do so at 5am Tuesday, which
+ * could also be in the next month or year. This is a common
+ * case, especially for PCs.
+ */
+ case day:
+ dev_dbg(&rtc->dev, "alarm rollover: %s\n", "day");
+ t_alm += 24 * 60 * 60;
+ rtc_time_to_tm(t_alm, &alarm->time);
+ break;
+
+ /* Month rollover ... if it's the 31th, an alarm on the 3rd will
+ * be next month. An alarm matching on the 30th, 29th, or 28th
+ * may end up in the month after that! Many newer PCs support
+ * this type of alarm.
+ */
+ case month:
+ dev_dbg(&rtc->dev, "alarm rollover: %s\n", "month");
+ do {
+ if (alarm->time.tm_mon < 11)
+ alarm->time.tm_mon++;
+ else {
+ alarm->time.tm_mon = 0;
+ alarm->time.tm_year++;
+ }
+ days = rtc_month_days(alarm->time.tm_mon,
+ alarm->time.tm_year);
+ } while (days < alarm->time.tm_mday);
+ break;
+
+ /* Year rollover ... easy except for leap years! */
+ case year:
+ dev_dbg(&rtc->dev, "alarm rollover: %s\n", "year");
+ do {
+ alarm->time.tm_year++;
+ } while (!rtc_valid_tm(&alarm->time));
+ break;
+
+ default:
+ dev_warn(&rtc->dev, "alarm rollover not handled\n");
+ }
+
+done:
return 0;
}
EXPORT_SYMBOL_GPL(rtc_read_alarm);
diff --git a/drivers/rtc/rtc-fm3130.c b/drivers/rtc/rtc-fm3130.c
index 11644c8fca8..abfdfcbaa05 100644
--- a/drivers/rtc/rtc-fm3130.c
+++ b/drivers/rtc/rtc-fm3130.c
@@ -55,7 +55,7 @@ struct fm3130 {
int alarm;
};
static const struct i2c_device_id fm3130_id[] = {
- { "fm3130-rtc", 0 },
+ { "fm3130", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, fm3130_id);
diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c
index 0fc4c363078..748a502a635 100644
--- a/drivers/rtc/rtc-pcf8563.c
+++ b/drivers/rtc/rtc-pcf8563.c
@@ -302,6 +302,7 @@ static int pcf8563_remove(struct i2c_client *client)
static const struct i2c_device_id pcf8563_id[] = {
{ "pcf8563", 0 },
+ { "rtc8564", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pcf8563_id);
diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c
index 82f62d25f92..67421b0d3a7 100644
--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -331,14 +331,14 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
RCNR = 0;
}
+ device_init_wakeup(&pdev->dev, 1);
+
rtc = rtc_device_register(pdev->name, &pdev->dev, &sa1100_rtc_ops,
THIS_MODULE);
if (IS_ERR(rtc))
return PTR_ERR(rtc);
- device_init_wakeup(&pdev->dev, 1);
-
platform_set_drvdata(pdev, rtc);
return 0;
diff --git a/drivers/rtc/rtc-x1205.c b/drivers/rtc/rtc-x1205.c
index eaf55945f21..7dcfba1bbfe 100644
--- a/drivers/rtc/rtc-x1205.c
+++ b/drivers/rtc/rtc-x1205.c
@@ -71,6 +71,7 @@
#define X1205_SR_RTCF 0x01 /* Clock failure */
#define X1205_SR_WEL 0x02 /* Write Enable Latch */
#define X1205_SR_RWEL 0x04 /* Register Write Enable */
+#define X1205_SR_AL0 0x20 /* Alarm 0 match */
#define X1205_DTR_DTR0 0x01
#define X1205_DTR_DTR1 0x02
@@ -78,6 +79,8 @@
#define X1205_HR_MIL 0x80 /* Set in ccr.hour for 24 hr mode */
+#define X1205_INT_AL0E 0x20 /* Alarm 0 enable */
+
static struct i2c_driver x1205_driver;
/*
@@ -89,8 +92,8 @@ static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm,
unsigned char reg_base)
{
unsigned char dt_addr[2] = { 0, reg_base };
-
unsigned char buf[8];
+ int i;
struct i2c_msg msgs[] = {
{ client->addr, 0, 2, dt_addr }, /* setup read ptr */
@@ -98,7 +101,7 @@ static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm,
};
/* read date registers */
- if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+ if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
dev_err(&client->dev, "%s: read error\n", __func__);
return -EIO;
}
@@ -110,6 +113,11 @@ static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm,
buf[0], buf[1], buf[2], buf[3],
buf[4], buf[5], buf[6], buf[7]);
+ /* Mask out the enable bits if these are alarm registers */
+ if (reg_base < X1205_CCR_BASE)
+ for (i = 0; i <= 4; i++)
+ buf[i] &= 0x7F;
+
tm->tm_sec = BCD2BIN(buf[CCR_SEC]);
tm->tm_min = BCD2BIN(buf[CCR_MIN]);
tm->tm_hour = BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
@@ -138,7 +146,7 @@ static int x1205_get_status(struct i2c_client *client, unsigned char *sr)
};
/* read status register */
- if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+ if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
dev_err(&client->dev, "%s: read error\n", __func__);
return -EIO;
}
@@ -147,10 +155,11 @@ static int x1205_get_status(struct i2c_client *client, unsigned char *sr)
}
static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
- int datetoo, u8 reg_base)
+ int datetoo, u8 reg_base, unsigned char alm_enable)
{
- int i, xfer;
+ int i, xfer, nbytes;
unsigned char buf[8];
+ unsigned char rdata[10] = { 0, reg_base };
static const unsigned char wel[3] = { 0, X1205_REG_SR,
X1205_SR_WEL };
@@ -189,6 +198,11 @@ static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
buf[CCR_Y2K] = BIN2BCD(tm->tm_year / 100);
}
+ /* If writing alarm registers, set compare bits on registers 0-4 */
+ if (reg_base < X1205_CCR_BASE)
+ for (i = 0; i <= 4; i++)
+ buf[i] |= 0x80;
+
/* this sequence is required to unlock the chip */
if ((xfer = i2c_master_send(client, wel, 3)) != 3) {
dev_err(&client->dev, "%s: wel - %d\n", __func__, xfer);
@@ -200,19 +214,57 @@ static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
return -EIO;
}
+
/* write register's data */
- for (i = 0; i < (datetoo ? 8 : 3); i++) {
- unsigned char rdata[3] = { 0, reg_base + i, buf[i] };
+ if (datetoo)
+ nbytes = 8;
+ else
+ nbytes = 3;
+ for (i = 0; i < nbytes; i++)
+ rdata[2+i] = buf[i];
+
+ xfer = i2c_master_send(client, rdata, nbytes+2);
+ if (xfer != nbytes+2) {
+ dev_err(&client->dev,
+ "%s: result=%d addr=%02x, data=%02x\n",
+ __func__,
+ xfer, rdata[1], rdata[2]);
+ return -EIO;
+ }
+
+ /* If we wrote to the nonvolatile region, wait 10msec for write cycle*/
+ if (reg_base < X1205_CCR_BASE) {
+ unsigned char al0e[3] = { 0, X1205_REG_INT, 0 };
+
+ msleep(10);
- xfer = i2c_master_send(client, rdata, 3);
+ /* ...and set or clear the AL0E bit in the INT register */
+
+ /* Need to set RWEL again as the write has cleared it */
+ xfer = i2c_master_send(client, rwel, 3);
if (xfer != 3) {
dev_err(&client->dev,
- "%s: xfer=%d addr=%02x, data=%02x\n",
+ "%s: aloe rwel - %d\n",
__func__,
- xfer, rdata[1], rdata[2]);
+ xfer);
+ return -EIO;
+ }
+
+ if (alm_enable)
+ al0e[2] = X1205_INT_AL0E;
+
+ xfer = i2c_master_send(client, al0e, 3);
+ if (xfer != 3) {
+ dev_err(&client->dev,
+ "%s: al0e - %d\n",
+ __func__,
+ xfer);
return -EIO;
}
- };
+
+ /* and wait 10msec again for this write to complete */
+ msleep(10);
+ }
/* disable further writes */
if ((xfer = i2c_master_send(client, diswe, 3)) != 3) {
@@ -230,9 +282,9 @@ static int x1205_fix_osc(struct i2c_client *client)
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
- if ((err = x1205_set_datetime(client, &tm, 0, X1205_CCR_BASE)) < 0)
- dev_err(&client->dev,
- "unable to restart the oscillator\n");
+ err = x1205_set_datetime(client, &tm, 0, X1205_CCR_BASE, 0);
+ if (err < 0)
+ dev_err(&client->dev, "unable to restart the oscillator\n");
return err;
}
@@ -248,7 +300,7 @@ static int x1205_get_dtrim(struct i2c_client *client, int *trim)
};
/* read dtr register */
- if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+ if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
dev_err(&client->dev, "%s: read error\n", __func__);
return -EIO;
}
@@ -280,7 +332,7 @@ static int x1205_get_atrim(struct i2c_client *client, int *trim)
};
/* read atr register */
- if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+ if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
dev_err(&client->dev, "%s: read error\n", __func__);
return -EIO;
}
@@ -403,14 +455,33 @@ static int x1205_validate_client(struct i2c_client *client)
static int x1205_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
- return x1205_get_datetime(to_i2c_client(dev),
- &alrm->time, X1205_ALM0_BASE);
+ int err;
+ unsigned char intreg, status;
+ static unsigned char int_addr[2] = { 0, X1205_REG_INT };
+ struct i2c_client *client = to_i2c_client(dev);
+ struct i2c_msg msgs[] = {
+ { client->addr, 0, 2, int_addr }, /* setup read ptr */
+ { client->addr, I2C_M_RD, 1, &intreg }, /* read INT register */
+ };
+
+ /* read interrupt register and status register */
+ if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
+ dev_err(&client->dev, "%s: read error\n", __func__);
+ return -EIO;
+ }
+ err = x1205_get_status(client, &status);
+ if (err == 0) {
+ alrm->pending = (status & X1205_SR_AL0) ? 1 : 0;
+ alrm->enabled = (intreg & X1205_INT_AL0E) ? 1 : 0;
+ err = x1205_get_datetime(client, &alrm->time, X1205_ALM0_BASE);
+ }
+ return err;
}
static int x1205_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
return x1205_set_datetime(to_i2c_client(dev),
- &alrm->time, 1, X1205_ALM0_BASE);
+ &alrm->time, 1, X1205_ALM0_BASE, alrm->enabled);
}
static int x1205_rtc_read_time(struct device *dev, struct rtc_time *tm)
@@ -422,7 +493,7 @@ static int x1205_rtc_read_time(struct device *dev, struct rtc_time *tm)
static int x1205_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
return x1205_set_datetime(to_i2c_client(dev),
- tm, 1, X1205_CCR_BASE);
+ tm, 1, X1205_CCR_BASE, 0);
}
static int x1205_rtc_proc(struct device *dev, struct seq_file *seq)
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-31 03:17:57 +0000