drivers/rtc/rtc-s35390a.c: add wakealarm support for rtc-s35390A rtc chip

Add basic get/set alarm support for the Seiko Instruments S-35390A.  The
chip is used on the QNAP TS-219P+ NAS device.

Signed-off-by: Michael Langer <michael.brainbug.langer@googlemail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/drivers/rtc/rtc-s35390a.c b/drivers/rtc/rtc-s35390a.c
index cc5c5166b01844c79f5d7e6f2506914c8193f945..8a092325188d07265e7c77f7935407d58c9e41e5 100644 (file)
--- a/drivers/rtc/rtc-s35390a.c
+++ b/drivers/rtc/rtc-s35390a.c
@@ -19,6 +19,8 @@
 #define S35390A_CMD_STATUS1    0
 #define S35390A_CMD_STATUS2    1
 #define S35390A_CMD_TIME1      2
+#define S35390A_CMD_TIME2      3
+#define S35390A_CMD_INT2_REG1  5
 
 #define S35390A_BYTE_YEAR      0
 #define S35390A_BYTE_MONTH     1
@@ -28,12 +30,23 @@
 #define S35390A_BYTE_MINS      5
 #define S35390A_BYTE_SECS      6
 
+#define S35390A_ALRM_BYTE_WDAY 0
+#define S35390A_ALRM_BYTE_HOURS        1
+#define S35390A_ALRM_BYTE_MINS 2
+
 #define S35390A_FLAG_POC       0x01
 #define S35390A_FLAG_BLD       0x02
 #define S35390A_FLAG_24H       0x40
 #define S35390A_FLAG_RESET     0x80
 #define S35390A_FLAG_TEST      0x01
 
+#define S35390A_INT2_MODE_MASK         0xF0
+
+#define S35390A_INT2_MODE_NOINTR       0x00
+#define S35390A_INT2_MODE_FREQ         0x10
+#define S35390A_INT2_MODE_ALARM                0x40
+#define S35390A_INT2_MODE_PMIN_EDG     0x20
+
 static const struct i2c_device_id s35390a_id[] = {
        { "s35390a", 0 },
        { }
@@ -193,6 +206,104 @@ static int s35390a_get_datetime(struct i2c_client *client, struct rtc_time *tm)
        return rtc_valid_tm(tm);
 }
 
+static int s35390a_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)
+{
+       struct s35390a *s35390a = i2c_get_clientdata(client);
+       char buf[3], sts = 0;
+       int err, i;
+
+       dev_dbg(&client->dev, "%s: alm is secs=%d, mins=%d, hours=%d mday=%d, "\
+               "mon=%d, year=%d, wday=%d\n", __func__, alm->time.tm_sec,
+               alm->time.tm_min, alm->time.tm_hour, alm->time.tm_mday,
+               alm->time.tm_mon, alm->time.tm_year, alm->time.tm_wday);
+
+       /* disable interrupt */
+       err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
+       if (err < 0)
+               return err;
+
+       /* clear pending interrupt, if any */
+       err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, &sts, sizeof(sts));
+       if (err < 0)
+               return err;
+
+       if (alm->enabled)
+               sts = S35390A_INT2_MODE_ALARM;
+       else
+               sts = S35390A_INT2_MODE_NOINTR;
+
+       /* This chip expects the bits of each byte to be in reverse order */
+       sts = bitrev8(sts);
+
+       /* set interupt mode*/
+       err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
+       if (err < 0)
+               return err;
+
+       if (alm->time.tm_wday != -1)
+               buf[S35390A_ALRM_BYTE_WDAY] = bin2bcd(alm->time.tm_wday) | 0x80;
+
+       buf[S35390A_ALRM_BYTE_HOURS] = s35390a_hr2reg(s35390a,
+                       alm->time.tm_hour) | 0x80;
+       buf[S35390A_ALRM_BYTE_MINS] = bin2bcd(alm->time.tm_min) | 0x80;
+
+       if (alm->time.tm_hour >= 12)
+               buf[S35390A_ALRM_BYTE_HOURS] |= 0x40;
+
+       for (i = 0; i < 3; ++i)
+               buf[i] = bitrev8(buf[i]);
+
+       err = s35390a_set_reg(s35390a, S35390A_CMD_INT2_REG1, buf,
+                                                               sizeof(buf));
+
+       return err;
+}
+
+static int s35390a_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)
+{
+       struct s35390a *s35390a = i2c_get_clientdata(client);
+       char buf[3], sts;
+       int i, err;
+
+       err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
+       if (err < 0)
+               return err;
+
+       if (bitrev8(sts) != S35390A_INT2_MODE_ALARM)
+               return -EINVAL;
+
+       err = s35390a_get_reg(s35390a, S35390A_CMD_INT2_REG1, buf, sizeof(buf));
+       if (err < 0)
+               return err;
+
+       /* This chip returns the bits of each byte in reverse order */
+       for (i = 0; i < 3; ++i) {
+               buf[i] = bitrev8(buf[i]);
+               buf[i] &= ~0x80;
+       }
+
+       alm->time.tm_wday = bcd2bin(buf[S35390A_ALRM_BYTE_WDAY]);
+       alm->time.tm_hour = s35390a_reg2hr(s35390a,
+                                               buf[S35390A_ALRM_BYTE_HOURS]);
+       alm->time.tm_min = bcd2bin(buf[S35390A_ALRM_BYTE_MINS]);
+
+       dev_dbg(&client->dev, "%s: alm is mins=%d, hours=%d, wday=%d\n",
+                       __func__, alm->time.tm_min, alm->time.tm_hour,
+                       alm->time.tm_wday);
+
+       return 0;
+}
+
+static int s35390a_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+       return s35390a_read_alarm(to_i2c_client(dev), alm);
+}
+
+static int s35390a_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+       return s35390a_set_alarm(to_i2c_client(dev), alm);
+}
+
 static int s35390a_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
        return s35390a_get_datetime(to_i2c_client(dev), tm);
@@ -206,6 +317,9 @@ static int s35390a_rtc_set_time(struct device *dev, struct rtc_time *tm)
 static const struct rtc_class_ops s35390a_rtc_ops = {
        .read_time      = s35390a_rtc_read_time,
        .set_time       = s35390a_rtc_set_time,
+       .set_alarm      = s35390a_rtc_set_alarm,
+       .read_alarm     = s35390a_rtc_read_alarm,
+
 };
 
 static struct i2c_driver s35390a_driver;
@@ -270,6 +384,8 @@ static int s35390a_probe(struct i2c_client *client,
        if (s35390a_get_datetime(client, &tm) < 0)
                dev_warn(&client->dev, "clock needs to be set\n");
 
+       device_set_wakeup_capable(&client->dev, 1);
+
        s35390a->rtc = rtc_device_register(s35390a_driver.driver.name,
                                &client->dev, &s35390a_rtc_ops, THIS_MODULE);