rtc: add support for Epson RTC-9701JE V4

Add support for the Epson RTC-9701JE SPI RTC device.
Signed-off-by: NMagnus Damm <damm@igel.co.jp>
Acked-by: NAlessandro Zummo <a.zummo@towertech.it>
Acked-by: NDavid Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-r9701.c

-/* drivers/rtc/rtc-r9701.c
- *
+/*
  * Driver for Epson RTC-9701JE
  *
  * Copyright (C) 2008 Magnus Damm
  *
- * Based on drivers/rtc/rtc-max6902.c
+ * Based on rtc-max6902.c
  *
  * Copyright (C) 2006 8D Technologies inc.
  * Copyright (C) 2004 Compulab Ltd.
@@ -72,13 +71,12 @@ static int read_regs(struct device *dev, unsigned char *regs, int no_regs)
 
 static int r9701_get_datetime(struct device *dev, struct rtc_time *dt)
 {
-	struct spi_device *spi = to_spi_device(dev);
 	unsigned long time;
 	int ret;
 	unsigned char buf[] = { RSECCNT, RMINCNT, RHRCNT,
 				RDAYCNT, RMONCNT, RYRCNT };
 
-	ret = read_regs(&spi->dev, buf, ARRAY_SIZE(buf));
+	ret = read_regs(dev, buf, ARRAY_SIZE(buf));
 	if (ret)
 		return ret;
 
@@ -96,17 +94,7 @@ static int r9701_get_datetime(struct device *dev, struct rtc_time *dt)
 	 * according to the data sheet. make sure they are valid.
 	 */
 
-	ret = rtc_valid_tm(dt);
-	if (ret)
-		return ret;
-
-	/* don't bother with yday, wday and isdst.
-	 * let the rtc core calculate them for us.
-	 */
-
-	rtc_tm_to_time(dt, &time);
-	rtc_time_to_tm(time, dt);
-	return 0;
+	return rtc_valid_tm(dt);
 }
 
 static int r9701_set_datetime(struct device *dev, struct rtc_time *dt)
@@ -118,12 +106,12 @@ static int r9701_set_datetime(struct device *dev, struct rtc_time *dt)
 		return -EINVAL;
 
 	ret = write_reg(dev, RHRCNT, BIN2BCD(dt->tm_hour));
-	ret |= write_reg(dev, RMINCNT, BIN2BCD(dt->tm_min));
-	ret |= write_reg(dev, RSECCNT, BIN2BCD(dt->tm_sec));
-	ret |= write_reg(dev, RDAYCNT, BIN2BCD(dt->tm_mday));
-	ret |= write_reg(dev, RMONCNT, BIN2BCD(dt->tm_mon + 1));
-	ret |= write_reg(dev, RYRCNT, BIN2BCD(dt->tm_year - 100));
-	ret |= write_reg(dev, RWKCNT, 1 << dt->tm_wday);
+	ret = ret ? ret : write_reg(dev, RMINCNT, BIN2BCD(dt->tm_min));
+	ret = ret ? ret : write_reg(dev, RSECCNT, BIN2BCD(dt->tm_sec));
+	ret = ret ? ret : write_reg(dev, RDAYCNT, BIN2BCD(dt->tm_mday));
+	ret = ret ? ret : write_reg(dev, RMONCNT, BIN2BCD(dt->tm_mon + 1));
+	ret = ret ? ret : write_reg(dev, RYRCNT, BIN2BCD(dt->tm_year - 100));
+	ret = ret ? ret : write_reg(dev, RWKCNT, 1 << dt->tm_wday);
 
 	return ret;
 }
@@ -146,10 +134,6 @@ static int __devinit r9701_probe(struct spi_device *spi)
 
 	dev_set_drvdata(&spi->dev, rtc);
 
-	spi->mode = SPI_MODE_3;
-	spi->bits_per_word = 8;
-	spi_setup(spi);
-
 	tmp = R100CNT;
 	res = read_regs(&spi->dev, &tmp, 1);
 	if (res || tmp != 0x20) {
@@ -171,7 +155,6 @@ static int __devexit r9701_remove(struct spi_device *spi)
 static struct spi_driver r9701_driver = {
 	.driver = {
 		.name	= "rtc-r9701",
-		.bus	= &spi_bus_type,
 		.owner	= THIS_MODULE,
 	},
 	.probe	= r9701_probe,