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Date: Wed, 4 Nov 2015 07:36:34 -0800
From: Joshua Clayton <stillcompiling@...il.com>
To: Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc: rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
Joshua Clayton <stillcompiling@...il.com>
Subject: [PATCH 3/9] rtc-pcf2123: clean up writes to the rtc chip
A new function pcf2123_write() hides the delay and the spi device,
while pcf2123_write_reg() further simplifies the most common case:
writing a single register.
Signed-off-by: Joshua Clayton <stillcompiling@...il.com>
---
drivers/rtc/rtc-pcf2123.c | 70 +++++++++++++++++++++++------------------------
1 file changed, 35 insertions(+), 35 deletions(-)
diff --git a/drivers/rtc/rtc-pcf2123.c b/drivers/rtc/rtc-pcf2123.c
index 648cb74..3acb2c8 100644
--- a/drivers/rtc/rtc-pcf2123.c
+++ b/drivers/rtc/rtc-pcf2123.c
@@ -119,6 +119,30 @@ static int pcf2123_read(struct device *dev, u8 reg, u8 *rxbuf, size_t size)
return ret;
}
+static int pcf2123_write(struct device *dev, u8 *txbuf, size_t size)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ int ret;
+
+ if (txbuf[0] > PCF2123_REG_MAX)
+ return -EFAULT;
+
+ txbuf[0] |= PCF2123_WRITE;
+ ret = spi_write(spi, txbuf, size);
+ pcf2123_delay_trec();
+
+ return ret;
+}
+
+static int pcf2123_write_reg(struct device *dev, u8 reg, u8 val)
+{
+ u8 txbuf[2];
+
+ txbuf[0] = reg;
+ txbuf[1] = val;
+ return pcf2123_write(dev, txbuf, sizeof(txbuf));
+}
+
static ssize_t pcf2123_show(struct device *dev, struct device_attribute *attr,
char *buffer)
{
@@ -142,9 +166,7 @@ static ssize_t pcf2123_show(struct device *dev, struct device_attribute *attr,
static ssize_t pcf2123_store(struct device *dev, struct device_attribute *attr,
const char *buffer, size_t count) {
- struct spi_device *spi = to_spi_device(dev);
struct pcf2123_sysfs_reg *r;
- u8 txbuf[2];
unsigned long reg;
unsigned long val;
@@ -160,12 +182,9 @@ static ssize_t pcf2123_store(struct device *dev, struct device_attribute *attr,
if (ret)
return ret;
- txbuf[0] = PCF2123_WRITE | reg;
- txbuf[1] = val;
- ret = spi_write(spi, txbuf, sizeof(txbuf));
+ pcf2123_write_reg(dev, reg, val);
if (ret < 0)
return -EIO;
- pcf2123_delay_trec();
return count;
}
@@ -205,7 +224,6 @@ static int pcf2123_rtc_read_time(struct device *dev, struct rtc_time *tm)
static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
- struct spi_device *spi = to_spi_device(dev);
u8 txbuf[8];
int ret;
@@ -216,15 +234,12 @@ static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
/* Stop the counter first */
- txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
- txbuf[1] = 0x20;
- ret = spi_write(spi, txbuf, 2);
+ ret = pcf2123_write_reg(dev, PCF2123_REG_CTRL1, 0x20);
if (ret < 0)
return ret;
- pcf2123_delay_trec();
/* Set the new time */
- txbuf[0] = PCF2123_WRITE | PCF2123_REG_SC;
+ txbuf[0] = PCF2123_REG_SC;
txbuf[1] = bin2bcd(tm->tm_sec & 0x7F);
txbuf[2] = bin2bcd(tm->tm_min & 0x7F);
txbuf[3] = bin2bcd(tm->tm_hour & 0x3F);
@@ -233,18 +248,14 @@ static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
txbuf[6] = bin2bcd((tm->tm_mon + 1) & 0x1F); /* rtc mn 1-12 */
txbuf[7] = bin2bcd(tm->tm_year < 100 ? tm->tm_year : tm->tm_year - 100);
- ret = spi_write(spi, txbuf, sizeof(txbuf));
+ ret = pcf2123_write(dev, txbuf, sizeof(txbuf));
if (ret < 0)
return ret;
- pcf2123_delay_trec();
/* Start the counter */
- txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
- txbuf[1] = 0x00;
- ret = spi_write(spi, txbuf, 2);
+ ret = pcf2123_write_reg(dev, PCF2123_REG_CTRL1, 0x00);
if (ret < 0)
return ret;
- pcf2123_delay_trec();
return 0;
}
@@ -258,7 +269,7 @@ static int pcf2123_probe(struct spi_device *spi)
{
struct rtc_device *rtc;
struct pcf2123_plat_data *pdata;
- u8 txbuf[2], rxbuf[2];
+ u8 rxbuf[2];
int ret, i;
pdata = devm_kzalloc(&spi->dev, sizeof(struct pcf2123_plat_data),
@@ -268,24 +279,16 @@ static int pcf2123_probe(struct spi_device *spi)
spi->dev.platform_data = pdata;
/* Send a software reset command */
- txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
- txbuf[1] = 0x58;
- dev_dbg(&spi->dev, "resetting RTC (0x%02X 0x%02X)\n",
- txbuf[0], txbuf[1]);
- ret = spi_write(spi, txbuf, 2 * sizeof(u8));
+ dev_dbg(&spi->dev, "resetting RTC\n");
+ ret = pcf2123_write_reg(&spi->dev, PCF2123_REG_CTRL1, 0x58);
if (ret < 0)
goto kfree_exit;
- pcf2123_delay_trec();
/* Stop the counter */
- txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
- txbuf[1] = 0x20;
- dev_dbg(&spi->dev, "stopping RTC (0x%02X 0x%02X)\n",
- txbuf[0], txbuf[1]);
- ret = spi_write(spi, txbuf, 2 * sizeof(u8));
+ dev_dbg(&spi->dev, "stopping RTC\n");
+ ret = pcf2123_write_reg(&spi->dev, PCF2123_REG_CTRL1, 0x20);
if (ret < 0)
goto kfree_exit;
- pcf2123_delay_trec();
/* See if the counter was actually stopped */
dev_dbg(&spi->dev, "checking for presence of RTC\n");
@@ -306,12 +309,9 @@ static int pcf2123_probe(struct spi_device *spi)
(spi->max_speed_hz + 500) / 1000);
/* Start the counter */
- txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
- txbuf[1] = 0x00;
- ret = spi_write(spi, txbuf, sizeof(txbuf));
+ ret = pcf2123_write_reg(&spi->dev, PCF2123_REG_CTRL1, 0x00);
if (ret < 0)
goto kfree_exit;
- pcf2123_delay_trec();
/* Finalize the initialization */
rtc = devm_rtc_device_register(&spi->dev, pcf2123_driver.driver.name,
--
2.5.0
--
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