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Message-Id: <d9c66693bdd714ea29aa432d9be3271b863d50f2.1451929910.git.stillcompiling@gmail.com>
Date: Mon, 4 Jan 2016 10:31:22 -0800
From: Joshua Clayton <stillcompiling@...il.com>
To: Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
Alessandro Zummo <a.zummo@...ertech.it>
Cc: rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
Joshua Clayton <stillcompiling@...il.com>
Subject: [PATCH v2 4/8] rtc-pcf2123: refactor chip reset into a function
Refactor chip reset items into its own function, isolating it from
the rest of the device probe.
Subsequent commits will avoid calling this code.
Signed-off-by: Joshua Clayton <stillcompiling@...il.com>
---
drivers/rtc/rtc-pcf2123.c | 64 ++++++++++++++++++++++++++---------------------
1 file changed, 36 insertions(+), 28 deletions(-)
diff --git a/drivers/rtc/rtc-pcf2123.c b/drivers/rtc/rtc-pcf2123.c
index 0f2ce45..2d886d4 100644
--- a/drivers/rtc/rtc-pcf2123.c
+++ b/drivers/rtc/rtc-pcf2123.c
@@ -272,6 +272,40 @@ static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
return 0;
}
+static int pcf2123_reset(struct device *dev)
+{
+ int ret;
+ u8 rxbuf[2];
+
+ ret = pcf2123_write_reg(dev, PCF2123_REG_CTRL1, CTRL1_SW_RESET);
+ if (ret < 0)
+ return ret;
+
+ /* Stop the counter */
+ dev_dbg(dev, "stopping RTC\n");
+ ret = pcf2123_write_reg(dev, PCF2123_REG_CTRL1, CTRL1_STOP);
+ if (ret < 0)
+ return ret;
+
+ /* See if the counter was actually stopped */
+ dev_dbg(dev, "checking for presence of RTC\n");
+ ret = pcf2123_read(dev, PCF2123_REG_CTRL1, rxbuf, sizeof(rxbuf));
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(dev, "received data from RTC (0x%02X 0x%02X)\n",
+ rxbuf[0], rxbuf[1]);
+ if (!(rxbuf[0] & CTRL1_STOP))
+ return -ENODEV;
+
+ /* Start the counter */
+ ret = pcf2123_write_reg(dev, PCF2123_REG_CTRL1, CTRL1_CLEAR);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
static const struct rtc_class_ops pcf2123_rtc_ops = {
.read_time = pcf2123_rtc_read_time,
.set_time = pcf2123_rtc_set_time,
@@ -281,7 +315,6 @@ static int pcf2123_probe(struct spi_device *spi)
{
struct rtc_device *rtc;
struct pcf2123_plat_data *pdata;
- u8 rxbuf[2];
int ret, i;
pdata = devm_kzalloc(&spi->dev, sizeof(struct pcf2123_plat_data),
@@ -290,29 +323,9 @@ static int pcf2123_probe(struct spi_device *spi)
return -ENOMEM;
spi->dev.platform_data = pdata;
- /* Send a software reset command */
- dev_dbg(&spi->dev, "resetting RTC\n");
- ret = pcf2123_write_reg(&spi->dev, PCF2123_REG_CTRL1, CTRL1_SW_RESET);
- if (ret < 0)
- goto kfree_exit;
-
- /* Stop the counter */
- dev_dbg(&spi->dev, "stopping RTC\n");
- ret = pcf2123_write_reg(&spi->dev, PCF2123_REG_CTRL1, CTRL1_STOP);
- if (ret < 0)
- goto kfree_exit;
-
- /* See if the counter was actually stopped */
- dev_dbg(&spi->dev, "checking for presence of RTC\n");
- ret = pcf2123_read(&spi->dev, PCF2123_REG_CTRL1, rxbuf, sizeof(rxbuf));
- dev_dbg(&spi->dev, "received data from RTC (0x%02X 0x%02X)\n",
- rxbuf[0], rxbuf[1]);
- if (ret < 0)
- goto kfree_exit;
-
- if (!(rxbuf[0] & 0x20)) {
+ ret = pcf2123_reset(&spi->dev);
+ if (ret < 0) {
dev_err(&spi->dev, "chip not found\n");
- ret = -ENODEV;
goto kfree_exit;
}
@@ -320,11 +333,6 @@ static int pcf2123_probe(struct spi_device *spi)
dev_info(&spi->dev, "spiclk %u KHz.\n",
(spi->max_speed_hz + 500) / 1000);
- /* Start the counter */
- ret = pcf2123_write_reg(&spi->dev, PCF2123_REG_CTRL1, CTRL1_CLEAR);
- if (ret < 0)
- goto kfree_exit;
-
/* Finalize the initialization */
rtc = devm_rtc_device_register(&spi->dev, pcf2123_driver.driver.name,
&pcf2123_rtc_ops, THIS_MODULE);
--
2.5.0
--
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