Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030687AbbKDPhK (ORCPT ); Wed, 4 Nov 2015 10:37:10 -0500 Received: from mail-pa0-f43.google.com ([209.85.220.43]:34629 "EHLO mail-pa0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030655AbbKDPhG (ORCPT ); Wed, 4 Nov 2015 10:37:06 -0500 From: Joshua Clayton To: Alessandro Zummo , Alexandre Belloni Cc: rtc-linux@googlegroups.com, linux-kernel@vger.kernel.org, Joshua Clayton Subject: [PATCH 2/9] rtc-pcf2123: clean up reads from the chip Date: Wed, 4 Nov 2015 07:36:33 -0800 Message-Id: X-Mailer: git-send-email 2.5.0 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3051 Lines: 101 put read operations into a function. This makes the starting register more prominent and hides the delay. Signed-off-by: Joshua Clayton --- drivers/rtc/rtc-pcf2123.c | 39 ++++++++++++++++++++++----------------- 1 file changed, 22 insertions(+), 17 deletions(-) diff --git a/drivers/rtc/rtc-pcf2123.c b/drivers/rtc/rtc-pcf2123.c index 7756210..648cb74 100644 --- a/drivers/rtc/rtc-pcf2123.c +++ b/drivers/rtc/rtc-pcf2123.c @@ -104,12 +104,26 @@ static inline void pcf2123_delay_trec(void) ndelay(30); } +static int pcf2123_read(struct device *dev, u8 reg, u8 *rxbuf, size_t size) +{ + struct spi_device *spi = to_spi_device(dev); + int ret; + + if (reg > PCF2123_REG_MAX) + return -EFAULT; + + reg |= PCF2123_READ; + ret = spi_write_then_read(spi, ®, 1, rxbuf, size); + pcf2123_delay_trec(); + + return ret; +} + static ssize_t pcf2123_show(struct device *dev, struct device_attribute *attr, char *buffer) { - struct spi_device *spi = to_spi_device(dev); struct pcf2123_sysfs_reg *r; - u8 txbuf[1], rxbuf[1]; + u8 rxbuf[1]; unsigned long reg; int ret; @@ -119,11 +133,10 @@ static ssize_t pcf2123_show(struct device *dev, struct device_attribute *attr, if (ret) return ret; - txbuf[0] = PCF2123_READ | reg; - ret = spi_write_then_read(spi, txbuf, 1, rxbuf, 1); + ret = pcf2123_read(dev, reg, rxbuf, 1); if (ret < 0) return -EIO; - pcf2123_delay_trec(); + return sprintf(buffer, "0x%x\n", rxbuf[0]); } @@ -158,16 +171,12 @@ static ssize_t pcf2123_store(struct device *dev, struct device_attribute *attr, static int pcf2123_rtc_read_time(struct device *dev, struct rtc_time *tm) { - struct spi_device *spi = to_spi_device(dev); - u8 txbuf[1], rxbuf[7]; + u8 rxbuf[7]; int ret; - txbuf[0] = PCF2123_READ | PCF2123_REG_SC; - ret = spi_write_then_read(spi, txbuf, sizeof(txbuf), - rxbuf, sizeof(rxbuf)); + ret = pcf2123_read(dev, PCF2123_REG_SC, rxbuf, sizeof(rxbuf)); if (ret < 0) return ret; - pcf2123_delay_trec(); tm->tm_sec = bcd2bin(rxbuf[0] & 0x7F); tm->tm_min = bcd2bin(rxbuf[1] & 0x7F); @@ -279,16 +288,12 @@ static int pcf2123_probe(struct spi_device *spi) pcf2123_delay_trec(); /* See if the counter was actually stopped */ - txbuf[0] = PCF2123_READ | PCF2123_REG_CTRL1; - dev_dbg(&spi->dev, "checking for presence of RTC (0x%02X)\n", - txbuf[0]); - ret = spi_write_then_read(spi, txbuf, 1 * sizeof(u8), - rxbuf, 2 * sizeof(u8)); + 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; - pcf2123_delay_trec(); if (!(rxbuf[0] & 0x20)) { dev_err(&spi->dev, "chip not found\n"); -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/