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Date: Tue, 21 Jul 2015 10:21:11 +0900
From: Krzysztof Kozlowski <k.kozlowski@...sung.com>
To: rtc-linux@...glegroups.com
Cc: Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
linux-kernel@...r.kernel.org
Subject: Re: [rtc-linux] [PATCH 4/4] RTC: switch to using is_visible() to
control sysfs attributes
2015-07-21 8:02 GMT+09:00 Dmitry Torokhov <dmitry.torokhov@...il.com>:
> Instead of creating an attribute manually, after the device has been
> registered, let's rely on facilities provided by the attribute groups to
> control which attributes are visible and which are not. This allows to to
> create all needed attributes at once, at the same time that we register
> RTC class device.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
> drivers/rtc/class.c | 4 +--
> drivers/rtc/rtc-core.h | 19 ++-----------
> drivers/rtc/rtc-sysfs.c | 75 +++++++++++++++++++++++++------------------------
> 3 files changed, 42 insertions(+), 56 deletions(-)
>
> diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
> index de7707f..de86578 100644
> --- a/drivers/rtc/class.c
> +++ b/drivers/rtc/class.c
> @@ -202,6 +202,7 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
> rtc->max_user_freq = 64;
> rtc->dev.parent = dev;
> rtc->dev.class = rtc_class;
> + rtc->dev.groups = rtc_get_dev_attribute_groups();
> rtc->dev.release = rtc_device_release;
>
> mutex_init(&rtc->ops_lock);
> @@ -240,7 +241,6 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
> }
>
> rtc_dev_add_device(rtc);
> - rtc_sysfs_add_device(rtc);
> rtc_proc_add_device(rtc);
>
> dev_info(dev, "rtc core: registered %s as %s\n",
> @@ -271,7 +271,6 @@ void rtc_device_unregister(struct rtc_device *rtc)
> * Remove innards of this RTC, then disable it, before
> * letting any rtc_class_open() users access it again
> */
> - rtc_sysfs_del_device(rtc);
> rtc_dev_del_device(rtc);
> rtc_proc_del_device(rtc);
> device_del(&rtc->dev);
> @@ -360,7 +359,6 @@ static int __init rtc_init(void)
> }
> rtc_class->pm = RTC_CLASS_DEV_PM_OPS;
> rtc_dev_init();
> - rtc_sysfs_init(rtc_class);
> return 0;
> }
>
> diff --git a/drivers/rtc/rtc-core.h b/drivers/rtc/rtc-core.h
> index 5f9df74..a098aea 100644
> --- a/drivers/rtc/rtc-core.h
> +++ b/drivers/rtc/rtc-core.h
> @@ -48,23 +48,10 @@ static inline void rtc_proc_del_device(struct rtc_device *rtc)
> #endif
>
> #ifdef CONFIG_RTC_INTF_SYSFS
> -
> -extern void __init rtc_sysfs_init(struct class *);
> -extern void rtc_sysfs_add_device(struct rtc_device *rtc);
> -extern void rtc_sysfs_del_device(struct rtc_device *rtc);
> -
> +const struct attribute_group **rtc_get_dev_attribute_groups(void);
> #else
> -
> -static inline void rtc_sysfs_init(struct class *rtc)
> -{
> -}
> -
> -static inline void rtc_sysfs_add_device(struct rtc_device *rtc)
> +static inline const struct attribute_group **rtc_get_dev_attribute_groups(void)
> {
> + return NULL;
> }
> -
> -static inline void rtc_sysfs_del_device(struct rtc_device *rtc)
> -{
> -}
> -
> #endif
> diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c
> index babd43b..0b4366c 100644
> --- a/drivers/rtc/rtc-sysfs.c
> +++ b/drivers/rtc/rtc-sysfs.c
> @@ -122,20 +122,8 @@ hctosys_show(struct device *dev, struct device_attribute *attr, char *buf)
> }
> static DEVICE_ATTR_RO(hctosys);
>
> -static struct attribute *rtc_attrs[] = {
> - &dev_attr_name.attr,
> - &dev_attr_date.attr,
> - &dev_attr_time.attr,
> - &dev_attr_since_epoch.attr,
> - &dev_attr_max_user_freq.attr,
> - &dev_attr_hctosys.attr,
> - NULL,
> -};
> -ATTRIBUTE_GROUPS(rtc);
> -
> static ssize_t
> -rtc_sysfs_show_wakealarm(struct device *dev, struct device_attribute *attr,
> - char *buf)
> +wakealarm_show(struct device *dev, struct device_attribute *attr, char *buf)
> {
> ssize_t retval;
> unsigned long alarm;
> @@ -159,7 +147,7 @@ rtc_sysfs_show_wakealarm(struct device *dev, struct device_attribute *attr,
> }
>
> static ssize_t
> -rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr,
> +wakealarm_store(struct device *dev, struct device_attribute *attr,
> const char *buf, size_t n)
> {
> ssize_t retval;
> @@ -221,45 +209,58 @@ rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr,
> retval = rtc_set_alarm(rtc, &alm);
> return (retval < 0) ? retval : n;
> }
> -static DEVICE_ATTR(wakealarm, S_IRUGO | S_IWUSR,
> - rtc_sysfs_show_wakealarm, rtc_sysfs_set_wakealarm);
> +static DEVICE_ATTR_RW(wakealarm);
This and renaming of show/store functions look unrelated
>
> +static struct attribute *rtc_attrs[] = {
> + &dev_attr_name.attr,
> + &dev_attr_date.attr,
> + &dev_attr_time.attr,
> + &dev_attr_since_epoch.attr,
> + &dev_attr_max_user_freq.attr,
> + &dev_attr_hctosys.attr,
> + &dev_attr_wakealarm.attr,
> + NULL,
> +};
>
> -/* The reason to trigger an alarm with no process watching it (via sysfs)
> +/*
> + * The reason to trigger an alarm with no process watching it (via sysfs)
> * is its side effect: waking from a system state like suspend-to-RAM or
> * suspend-to-disk. So: no attribute unless that side effect is possible.
> * (Userspace may disable that mechanism later.)
> */
> -static inline int rtc_does_wakealarm(struct rtc_device *rtc)
> +static bool rtc_does_wakealarm(struct rtc_device *rtc)
> {
> if (!device_can_wakeup(rtc->dev.parent))
> - return 0;
> + return false;
> +
> return rtc->ops->set_alarm != NULL;
> }
This looks unrelated too and confuses me. Could you split such cleanup
from main goal of the patch?
Best regards,
Krzysztof
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