From patchwork Mon Mar 4 14:05:45 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steffen Trumtrar X-Patchwork-Id: 2212991 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 9F92E3FCF2 for ; Mon, 4 Mar 2013 14:11:23 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UCW4L-00022G-8a; Mon, 04 Mar 2013 14:08:45 +0000 Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UCW2I-0000sR-Eb for linux-arm-kernel@lists.infradead.org; Mon, 04 Mar 2013 14:06:39 +0000 Received: from dude.hi.pengutronix.de ([2001:6f8:1178:2:21e:67ff:fe11:9c5c]) by metis.ext.pengutronix.de with esmtp (Exim 4.72) (envelope-from ) id 1UCW1j-0004Yh-AP; Mon, 04 Mar 2013 15:06:03 +0100 Received: from str by dude.hi.pengutronix.de with local (Exim 4.80) (envelope-from ) id 1UCW1h-0002Jn-Ad; Mon, 04 Mar 2013 15:06:01 +0100 From: Steffen Trumtrar To: rtc-linux@googlegroups.com, devicetree-discuss@lists.ozlabs.org Subject: [PATCH 6/9] rtc: stmp3xxx: add sysfs entries for persistent regs Date: Mon, 4 Mar 2013 15:05:45 +0100 Message-Id: <1362405948-12992-7-git-send-email-s.trumtrar@pengutronix.de> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1362405948-12992-1-git-send-email-s.trumtrar@pengutronix.de> References: <1362405948-12992-1-git-send-email-s.trumtrar@pengutronix.de> X-SA-Exim-Connect-IP: 2001:6f8:1178:2:21e:67ff:fe11:9c5c X-SA-Exim-Mail-From: str@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-arm-kernel@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130304_090638_970659_0E881BBB X-CRM114-Status: GOOD ( 16.28 ) X-Spam-Score: -2.5 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.6 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Alessandro Zummo , Shawn Guo , Steffen Trumtrar , kernel@pengutronix.de, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org The persistent registers 1-5 are completely software defined. To have access from userspace, export them via sysfs. Signed-off-by: Steffen Trumtrar --- drivers/rtc/rtc-stmp3xxx.c | 69 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) diff --git a/drivers/rtc/rtc-stmp3xxx.c b/drivers/rtc/rtc-stmp3xxx.c index 936b0ca..16b45c8 100644 --- a/drivers/rtc/rtc-stmp3xxx.c +++ b/drivers/rtc/rtc-stmp3xxx.c @@ -67,6 +67,8 @@ /* missing bitmask in headers */ #define STMP3XXX_RTC_PERSISTENT1_FORCE_UPDATER 0x80000000 +#define STMP3XXX_RTC_PERSISTENT_LEN (0xC0 - STMP3XXX_RTC_PERSISTENT1) + enum clock_source { MXS_UNKNOWN, MXS_OSC_24M, MXS_OSC_32K, MXS_OSC_32K768 }; struct stmp3xxx_rtc_data { @@ -74,6 +76,9 @@ struct stmp3xxx_rtc_data { void __iomem *io; int irq_alarm; enum clock_source clk_src; +#if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) + struct bin_attribute *persist; +#endif }; #if IS_ENABLED(CONFIG_STMP3XXX_RTC_WATCHDOG) @@ -262,6 +267,42 @@ static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) return 0; } +#if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) +static ssize_t stmp3xxx_rtc_persist_read(struct file *filep, + struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t size) +{ + struct rtc_device *rtc = container_of(kobj, struct rtc_device, + dev.kobj); + struct device *dev = rtc->dev.parent; + struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); + ssize_t count; + + for (count = 0; size; size--, off++, count++) + *buf++ = readl(rtc_data->io + STMP3XXX_RTC_PERSISTENT1 + off); + + return count; +} + +static ssize_t stmp3xxx_rtc_persist_write(struct file *filep, + struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t size) +{ + struct rtc_device *rtc = container_of(kobj, struct rtc_device, + dev.kobj); + struct device *dev = rtc->dev.parent; + struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); + ssize_t count; + + for (count = 0; size; size--, off++, count++) + writel(*buf++, rtc_data->io + STMP3XXX_RTC_PERSISTENT1 + off); + + return count; +} +#endif + static struct rtc_class_ops stmp3xxx_rtc_ops = { .alarm_irq_enable = stmp3xxx_alarm_irq_enable, @@ -278,6 +319,11 @@ static int stmp3xxx_rtc_remove(struct platform_device *pdev) if (!rtc_data) return 0; +#if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) + sysfs_remove_bin_file(&pdev->dev.kobj, rtc_data->persist); + kfree(rtc_data->persist); +#endif + writel(STMP3XXX_RTC_CTRL_ALARM_IRQ_EN, rtc_data->io + STMP3XXX_RTC_CTRL_CLR); free_irq(rtc_data->irq_alarm, &pdev->dev); @@ -384,8 +430,31 @@ static int stmp3xxx_rtc_probe(struct platform_device *pdev) } stmp3xxx_wdt_register(pdev); + +#if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) + rtc_data->persist = kzalloc(sizeof(struct bin_attribute), GFP_KERNEL); + if (!rtc_data->persist) { + err = -ENOMEM; + goto out_persist; + } + + rtc_data->persist->attr.name = "persistent"; + rtc_data->persist->attr.mode = S_IRUGO | S_IWUSR; + sysfs_bin_attr_init(rtc_data->persist); + rtc_data->persist->read = stmp3xxx_rtc_persist_read; + rtc_data->persist->write = stmp3xxx_rtc_persist_write; + rtc_data->persist->size = STMP3XXX_RTC_PERSISTENT_LEN; + err = sysfs_create_bin_file(&rtc_data->rtc->dev.kobj, + rtc_data->persist); + if (err) { + kfree(rtc_data->persist); + goto out_persist; + } +#endif + return 0; +out_persist: out_irq_alarm: rtc_device_unregister(rtc_data->rtc); out_remap: