drivers/rtc/rtc-pcf8563.c: add alarm support

This patch adds alarm support for the NXP PCF8563 chip.

Signed-off-by: Vincent Donnefort <vdonnefort@gmail.com>
Cc: Simon Guinot <simon.guinot@sequanux.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 153 insertions, 4 deletions

diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c
index 7cbbf50cd895..5a197d9dc7e7 100644
--- a/drivers/rtc/rtc-pcf8563.c
+++ b/drivers/rtc/rtc-pcf8563.c
@@ -26,6 +26,8 @@
 
 #define PCF8563_REG_ST1         0x00 /* status */
 #define PCF8563_REG_ST2         0x01
+#define PCF8563_BIT_AIE         (1 << 1)
+#define PCF8563_BIT_AF          (1 << 3)
 
 #define PCF8563_REG_SC          0x02 /* datetime */
 #define PCF8563_REG_MN          0x03
@@ -36,9 +38,6 @@
 #define PCF8563_REG_YR          0x08
 
 #define PCF8563_REG_AMN         0x09 /* alarm */
-#define PCF8563_REG_AHR         0x0A
-#define PCF8563_REG_ADM         0x0B
-#define PCF8563_REG_ADW         0x0C
 
 #define PCF8563_REG_CLKO        0x0D /* clock out */
 #define PCF8563_REG_TMRC        0x0E /* timer control */
@@ -67,6 +66,8 @@ struct pcf8563 {
          */
         int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
         int voltage_low; /* incicates if a low_voltage was detected */
+
+        struct i2c_client *client;
 };
 
 static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
@@ -115,6 +116,69 @@ static int pcf8563_write_block_data(struct i2c_client *client,
         return 0;
 }
 
+static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
+{
+        unsigned char buf[2];
+        int err;
+
+        err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, buf + 1);
+        if (err < 0)
+                return err;
+
+        if (on)
+                buf[1] |= PCF8563_BIT_AIE;
+        else
+                buf[1] &= ~PCF8563_BIT_AIE;
+
+        buf[1] &= ~PCF8563_BIT_AF;
+        buf[0] = PCF8563_REG_ST2;
+
+        err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, buf + 1);
+        if (err < 0) {
+                dev_err(&client->dev, "%s: write error\n", __func__);
+                return -EIO;
+        }
+
+        return 0;
+}
+
+static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
+                                  unsigned char *pen)
+{
+        unsigned char buf;
+        int err;
+
+        err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
+        if (err)
+                return err;
+
+        if (en)
+                *en = !!(buf & PCF8563_BIT_AIE);
+        if (pen)
+                *pen = !!(buf & PCF8563_BIT_AF);
+
+        return 0;
+}
+
+static irqreturn_t pcf8563_irq(int irq, void *dev_id)
+{
+        struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
+        int err;
+        char pending;
+
+        err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
+        if (err < 0)
+                return err;
+
+        if (pending) {
+                rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
+                pcf8563_set_alarm_mode(pcf8563->client, 1);
+                return IRQ_HANDLED;
+        }
+
+        return IRQ_NONE;
+}
+
 /*
  * In the routines that deal directly with the pcf8563 hardware, we use
  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
@@ -257,16 +321,83 @@ static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
         return pcf8563_set_datetime(to_i2c_client(dev), tm);
 }
 
+static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        unsigned char buf[4];
+        int err;
+
+        err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
+        if (err)
+                return err;
+
+        dev_dbg(&client->dev,
+                "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
+                __func__, buf[0], buf[1], buf[2], buf[3]);
+
+        tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
+        tm->time.tm_hour = bcd2bin(buf[1] & 0x7F);
+        tm->time.tm_mday = bcd2bin(buf[2] & 0x1F);
+        tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
+        tm->time.tm_mon = -1;
+        tm->time.tm_year = -1;
+        tm->time.tm_yday = -1;
+        tm->time.tm_isdst = -1;
+
+        err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
+        if (err < 0)
+                return err;
+
+        dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
+                " enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
+                tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
+                tm->enabled, tm->pending);
+
+        return 0;
+}
+
+static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        unsigned char buf[4];
+        int err;
+
+        dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
+                "enabled=%d pending=%d\n", __func__,
+                tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
+                tm->time.tm_mday, tm->enabled, tm->pending);
+
+        buf[0] = bin2bcd(tm->time.tm_min);
+        buf[1] = bin2bcd(tm->time.tm_hour);
+        buf[2] = bin2bcd(tm->time.tm_mday);
+        buf[3] = tm->time.tm_wday & 0x07;
+
+        err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
+        if (err)
+                return err;
+
+        return pcf8563_set_alarm_mode(client, 1);
+}
+
+static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
+{
+        return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
+}
+
 static const struct rtc_class_ops pcf8563_rtc_ops = {
         .ioctl          = pcf8563_rtc_ioctl,
         .read_time      = pcf8563_rtc_read_time,
         .set_time       = pcf8563_rtc_set_time,
+        .read_alarm     = pcf8563_rtc_read_alarm,
+        .set_alarm      = pcf8563_rtc_set_alarm,
+        .alarm_irq_enable = pcf8563_irq_enable,
 };
 
 static int pcf8563_probe(struct i2c_client *client,
                                 const struct i2c_device_id *id)
 {
         struct pcf8563 *pcf8563;
+        int err;
 
         dev_dbg(&client->dev, "%s\n", __func__);
 
@@ -281,12 +412,30 @@ static int pcf8563_probe(struct i2c_client *client,
         dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
 
         i2c_set_clientdata(client, pcf8563);
+        pcf8563->client = client;
+        device_set_wakeup_capable(&client->dev, 1);
 
         pcf8563->rtc = devm_rtc_device_register(&client->dev,
                                 pcf8563_driver.driver.name,
                                 &pcf8563_rtc_ops, THIS_MODULE);
 
-        return PTR_ERR_OR_ZERO(pcf8563->rtc);
+        if (IS_ERR(pcf8563->rtc))
+                return PTR_ERR(pcf8563->rtc);
+
+        if (client->irq > 0) {
+                err = devm_request_threaded_irq(&client->dev, client->irq,
+                                NULL, pcf8563_irq,
+                                IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING,
+                                pcf8563->rtc->name, client);
+                if (err) {
+                        dev_err(&client->dev, "unable to request IRQ %d\n",
+                                                                client->irq);
+                        return err;
+                }
+
+        }
+
+        return 0;
 }
 
 static const struct i2c_device_id pcf8563_id[] = {