rtc: rv3029: Add i2c register update-bits helper

This simplifies mask/set operations on device I2C registers.

Signed-off-by: Michael Buesch <m@bues.ch>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c
index 29cc871aa87166aadb932092469a5292d4898a7f..a58188ed4666fe9fb23f3666957229e30739e53b 100644 (file)
--- a/drivers/rtc/rtc-rv3029c2.c
+++ b/drivers/rtc/rtc-rv3029c2.c
@@ -2,6 +2,7 @@
  * Micro Crystal RV-3029 rtc class driver
  *
  * Author: Gregory Hermant <gregory.hermant@calao-systems.com>
+ *         Michael Buesch <m@bues.ch>
  *
  * based on previously existing rtc class drivers
  *
@@ -142,6 +143,24 @@ rv3029_i2c_write_regs(struct i2c_client *client, u8 reg, u8 const buf[],
        return i2c_smbus_write_i2c_block_data(client, reg, len, buf);
 }
 
+static int
+rv3029_i2c_update_bits(struct i2c_client *client, u8 reg, u8 mask, u8 set)
+{
+       u8 buf;
+       int ret;
+
+       ret = rv3029_i2c_read_regs(client, reg, &buf, 1);
+       if (ret < 0)
+               return ret;
+       buf &= ~mask;
+       buf |= set & mask;
+       ret = rv3029_i2c_write_regs(client, reg, &buf, 1);
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
 static int
 rv3029_i2c_get_sr(struct i2c_client *client, u8 *buf)
 {
@@ -260,22 +279,13 @@ static int rv3029_rtc_i2c_alarm_set_irq(struct i2c_client *client,
                                        int enable)
 {
        int ret;
-       u8 buf[1];
-
-       /* enable AIE irq */
-       ret = rv3029_i2c_read_regs(client, RV3029_IRQ_CTRL, buf, 1);
-       if (ret < 0) {
-               dev_err(&client->dev, "can't read INT reg\n");
-               return ret;
-       }
-       if (enable)
-               buf[0] |= RV3029_IRQ_CTRL_AIE;
-       else
-               buf[0] &= ~RV3029_IRQ_CTRL_AIE;
 
-       ret = rv3029_i2c_write_regs(client, RV3029_IRQ_CTRL, buf, 1);
+       /* enable/disable AIE irq */
+       ret = rv3029_i2c_update_bits(client, RV3029_IRQ_CTRL,
+                                    RV3029_IRQ_CTRL_AIE,
+                                    (enable ? RV3029_IRQ_CTRL_AIE : 0));
        if (ret < 0) {
-               dev_err(&client->dev, "can't set INT reg\n");
+               dev_err(&client->dev, "can't update INT reg\n");
                return ret;
        }
 
@@ -316,20 +326,11 @@ static int rv3029_rtc_i2c_set_alarm(struct i2c_client *client,
                return ret;
 
        if (alarm->enabled) {
-               u8 buf[1];
-
                /* clear AF flag */
-               ret = rv3029_i2c_read_regs(client, RV3029_IRQ_FLAGS,
-                                          buf, 1);
-               if (ret < 0) {
-                       dev_err(&client->dev, "can't read alarm flag\n");
-                       return ret;
-               }
-               buf[0] &= ~RV3029_IRQ_FLAGS_AF;
-               ret = rv3029_i2c_write_regs(client, RV3029_IRQ_FLAGS,
-                                           buf, 1);
+               ret = rv3029_i2c_update_bits(client, RV3029_IRQ_FLAGS,
+                                            RV3029_IRQ_FLAGS_AF, 0);
                if (ret < 0) {
-                       dev_err(&client->dev, "can't set alarm flag\n");
+                       dev_err(&client->dev, "can't clear alarm flag\n");
                        return ret;
                }
                /* enable AIE irq */
@@ -454,5 +455,6 @@ static struct i2c_driver rv3029_driver = {
 module_i2c_driver(rv3029_driver);
 
 MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
+MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
 MODULE_DESCRIPTION("Micro Crystal RV3029 RTC driver");
 MODULE_LICENSE("GPL");