b43legacy: RF-kill support

This adds full support for the RFKILL button and the RFKILL LED trigger.

This is a port to b43legacy of a patch by Michael Buesch <mb@bu3sch.de>
for b43.

Signed-off-by: Larry Finger<Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 158 insertions, 0 deletions

diff --git a/drivers/net/wireless/b43legacy/rfkill.c b/drivers/net/wireless/b43legacy/rfkill.c
new file mode 100644
index 000000000000..db6292642057
--- /dev/null
+++ b/drivers/net/wireless/b43legacy/rfkill.c
@@ -0,0 +1,158 @@
+/*
+
+  Broadcom B43legacy wireless driver
+  RFKILL support
+
+  Copyright (c) 2007 Michael Buesch <mb@bu3sch.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; see the file COPYING.  If not, write to
+  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
+  Boston, MA 02110-1301, USA.
+
+*/
+
+#include "rfkill.h"
+#include "radio.h"
+#include "b43legacy.h"
+
+
+static void b43legacy_notify_rfkill_press(struct work_struct *work)
+{
+	struct b43legacy_rfkill *rfk = container_of(work,
+						    struct b43legacy_rfkill,
+						    notify_work);
+	struct b43legacy_wl *wl = container_of(rfk, struct b43legacy_wl,
+				  rfkill);
+	struct b43legacy_wldev *dev;
+	enum rfkill_state state;
+
+	mutex_lock(&wl->mutex);
+	dev = wl->current_dev;
+	if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) {
+		mutex_unlock(&wl->mutex);
+		return;
+	}
+	if (dev->radio_hw_enable)
+		state = RFKILL_STATE_ON;
+	else
+		state = RFKILL_STATE_OFF;
+	b43legacyinfo(wl, "Radio hardware status changed to %s\n",
+		dev->radio_hw_enable ? "ENABLED" : "DISABLED");
+	mutex_unlock(&wl->mutex);
+
+	if (rfk->rfkill) {
+		/* Be careful. This calls back into the software toggle
+		 * routines. So we must unlock before calling. */
+		rfkill_switch_all(rfk->rfkill->type, state);
+	}
+}
+
+/* Called when the RFKILL toggled in hardware.
+ * This is called with the mutex locked. */
+void b43legacy_rfkill_toggled(struct b43legacy_wldev *dev, bool on)
+{
+	struct b43legacy_wl *wl = dev->wl;
+
+	B43legacy_WARN_ON(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED);
+	/* Update the RF status asynchronously, as rfkill will
+	 * call back into the software toggle handler.
+	 * This would deadlock if done synchronously. */
+	queue_work(wl->hw->workqueue, &wl->rfkill.notify_work);
+}
+
+/* Called when the RFKILL toggled in software.
+ * This is called without locking. */
+static int b43legacy_rfkill_soft_toggle(void *data, enum rfkill_state state)
+{
+	struct b43legacy_wldev *dev = data;
+	struct b43legacy_wl *wl = dev->wl;
+	int err = 0;
+
+	mutex_lock(&wl->mutex);
+	if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)
+		goto out_unlock;
+
+	switch (state) {
+	case RFKILL_STATE_ON:
+		if (!dev->radio_hw_enable) {
+			/* No luck. We can't toggle the hardware RF-kill
+			 * button from software. */
+			err = -EBUSY;
+			goto out_unlock;
+		}
+		if (!dev->phy.radio_on)
+			b43legacy_radio_turn_on(dev);
+		break;
+	case RFKILL_STATE_OFF:
+		if (dev->phy.radio_on)
+			b43legacy_radio_turn_off(dev, 0);
+		break;
+	}
+
+out_unlock:
+	mutex_unlock(&wl->mutex);
+
+	return err;
+}
+
+char *b43legacy_rfkill_led_name(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_wl *wl = dev->wl;
+
+	if (!wl->rfkill.rfkill)
+		return NULL;
+	return rfkill_get_led_name(wl->rfkill.rfkill);
+}
+
+void b43legacy_rfkill_init(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_wl *wl = dev->wl;
+	struct b43legacy_rfkill *rfk = &(wl->rfkill);
+	int err;
+
+	snprintf(rfk->name, sizeof(rfk->name),
+		 "b43legacy-%s", wiphy_name(wl->hw->wiphy));
+	rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
+	if (!rfk->rfkill)
+		goto error;
+	rfk->rfkill->name = rfk->name;
+	rfk->rfkill->state = RFKILL_STATE_ON;
+	rfk->rfkill->data = dev;
+	rfk->rfkill->toggle_radio = b43legacy_rfkill_soft_toggle;
+	rfk->rfkill->user_claim_unsupported = 1;
+
+	INIT_WORK(&rfk->notify_work, b43legacy_notify_rfkill_press);
+
+	err = rfkill_register(rfk->rfkill);
+	if (err)
+		goto error;
+
+	return;
+error:
+	b43legacywarn(dev->wl, "Failed to initialize the RF-kill button\n");
+	rfkill_free(rfk->rfkill);
+	rfk->rfkill = NULL;
+}
+
+void b43legacy_rfkill_exit(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
+
+	if (!rfk->rfkill)
+		return;
+	cancel_work_sync(&rfk->notify_work);
+	rfkill_unregister(rfk->rfkill);
+	rfkill_free(rfk->rfkill);
+	rfk->rfkill = NULL;
+}