linux-kernel - [PATCH v2 2/2] enhance sysfs rfkill interface

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Message-Id: <1267009517-5017-3-git-send-email-florian@mickler.org>
Date:	Wed, 24 Feb 2010 12:05:17 +0100
From:	florian@...kler.org
To:	"Marcel Holtmann" <marcel@...tmann.org>
Cc:	"Johannes Berg" <johannes@...solutions.net>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org,
	"Randy Dunlap" <rdunlap@...otime.net>,
	"Alan Jenkins" <alan-jenkins@...fmail.co.uk>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Florian Mickler <florian@...kler.org>
Subject: [PATCH v2 2/2] enhance sysfs rfkill interface

This commit introduces two new sysfs knobs.

/sys/class/rfkill/rfkill[0-9]+/hw: (ro)
	hardblock kill state
/sys/class/rfkill/rfkill[0-9]+/sw: (rw)
	softblock kill state

Signed-off-by: Florian Mickler <florian@...kler.org>
---

I am not shure about those names.
Other alternatives: 
[hs]w_block
block_[hs]w
block[sh]w
soft/hard

...


 Documentation/ABI/stable/sysfs-class-rfkill |   25 ++++++++++++
 net/rfkill/core.c                           |   57 +++++++++++++++++++++++++++
 2 files changed, 82 insertions(+), 0 deletions(-)

diff --git a/Documentation/ABI/stable/sysfs-class-rfkill b/Documentation/ABI/stable/sysfs-class-rfkill
index 97d5064..ccbbba2 100644
--- a/Documentation/ABI/stable/sysfs-class-rfkill
+++ b/Documentation/ABI/stable/sysfs-class-rfkill
@@ -40,3 +40,28 @@ Description: 	Whether the soft blocked state is initialised from non-volatile
 Values: 	A numeric value.
 		0: false
 		1: true
+
+
+What:		/sys/class/rfkill/rfkill[0-9]+/hw
+Date:		23-Feb-2010
+KernelVersion	v2.6.34
+Contact:	linux-wireless@...r.kernel.org
+Description: 	Current hardblock state. This file is read only.
+Values: 	A numeric value.
+		0: inactive
+			The transmitter is (potentially) active.
+		1: active
+			The transmitter is forced off by something outside of
+			the driver's control.
+
+
+What:		/sys/class/rfkill/rfkill[0-9]+/sw
+Date:		23-Feb-2010
+KernelVersion	v2.6.34
+Contact:	linux-wireless@...r.kernel.org
+Description:	Current softblock state. This file is read and write.
+Values: 	A numeric value.
+		0: inactive
+			The transmitter is (potentially) active.
+		1: active
+			The transmitter is turned off by software.
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index c218e07..b91e192 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -628,6 +628,61 @@ static ssize_t rfkill_persistent_show(struct device *dev,
 	return sprintf(buf, "%d\n", rfkill->persistent);
 }
 
+static ssize_t rfkill_hw_show(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
+{
+	struct rfkill *rfkill = to_rfkill(dev);
+	unsigned long flags;
+	u32 state;
+
+	spin_lock_irqsave(&rfkill->lock, flags);
+	state = rfkill->state;
+	spin_unlock_irqrestore(&rfkill->lock, flags);
+
+	return sprintf(buf, "%d\n", (state & RFKILL_BLOCK_HW) ? 1 : 0 );
+}
+
+static ssize_t rfkill_sw_show(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
+{
+	struct rfkill *rfkill = to_rfkill(dev);
+	unsigned long flags;
+	u32 state;
+
+	spin_lock_irqsave(&rfkill->lock, flags);
+	state = rfkill->state;
+	spin_unlock_irqrestore(&rfkill->lock, flags);
+
+	return sprintf(buf, "%d\n", (state & RFKILL_BLOCK_SW) ? 1 : 0 );
+}
+
+static ssize_t rfkill_sw_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	struct rfkill *rfkill = to_rfkill(dev);
+	unsigned long state;
+	int err;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	err = strict_strtoul(buf, 0, &state);
+	if (err)
+		return err;
+
+	if (state > 1 )
+		return -EINVAL;
+
+	mutex_lock(&rfkill_global_mutex);
+	rfkill_set_block(rfkill, state);
+	mutex_unlock(&rfkill_global_mutex);
+
+	return err ?: count;
+}
+
 static u8 user_state_from_blocked(unsigned long state)
 {
 	if (state & RFKILL_BLOCK_HW)
@@ -700,6 +755,8 @@ static struct device_attribute rfkill_dev_attrs[] = {
 	__ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL),
 	__ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
 	__ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
+	__ATTR(sw, S_IRUGO|S_IWUSR, rfkill_sw_show, rfkill_sw_store),
+	__ATTR(hw, S_IRUGO, rfkill_hw_show, NULL),
 	__ATTR_NULL
 };
 
-- 
1.6.6.1

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