[B43]: RF-kill support

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

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 155 insertions, 0 deletions

diff --git a/drivers/net/wireless/b43/rfkill.c b/drivers/net/wireless/b43/rfkill.c
new file mode 100644
index 00000000000..c25fd9956a9
--- /dev/null
+++ b/drivers/net/wireless/b43/rfkill.c
@@ -0,0 +1,155 @@
+/*
+
+  Broadcom B43 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 "b43.h"
+
+
+static void b43_notify_rfkill_press(struct work_struct *work)
+{
+        struct b43_rfkill *rfk = container_of(work, struct b43_rfkill,
+                                              notify_work);
+        struct b43_wl *wl = container_of(rfk, struct b43_wl, rfkill);
+        struct b43_wldev *dev;
+        enum rfkill_state state;
+
+        mutex_lock(&wl->mutex);
+        dev = wl->current_dev;
+        if (b43_status(dev) < B43_STAT_INITIALIZED) {
+                mutex_unlock(&wl->mutex);
+                return;
+        }
+        if (dev->radio_hw_enable)
+                state = RFKILL_STATE_ON;
+        else
+                state = RFKILL_STATE_OFF;
+        b43info(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 b43_rfkill_toggled(struct b43_wldev *dev, bool on)
+{
+        struct b43_wl *wl = dev->wl;
+
+        B43_WARN_ON(b43_status(dev) < B43_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 b43_rfkill_soft_toggle(void *data, enum rfkill_state state)
+{
+        struct b43_wldev *dev = data;
+        struct b43_wl *wl = dev->wl;
+        int err = 0;
+
+        mutex_lock(&wl->mutex);
+        if (b43_status(dev) < B43_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)
+                        b43_radio_turn_on(dev);
+                break;
+        case RFKILL_STATE_OFF:
+                if (dev->phy.radio_on)
+                        b43_radio_turn_off(dev, 0);
+                break;
+        }
+
+out_unlock:
+        mutex_unlock(&wl->mutex);
+
+        return err;
+}
+
+char * b43_rfkill_led_name(struct b43_wldev *dev)
+{
+        struct b43_wl *wl = dev->wl;
+
+        if (!wl->rfkill.rfkill)
+                return NULL;
+        return rfkill_get_led_name(wl->rfkill.rfkill);
+}
+
+void b43_rfkill_init(struct b43_wldev *dev)
+{
+        struct b43_wl *wl = dev->wl;
+        struct b43_rfkill *rfk = &(wl->rfkill);
+        int err;
+
+        snprintf(rfk->name, sizeof(rfk->name),
+                 "b43-%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 = b43_rfkill_soft_toggle;
+        rfk->rfkill->user_claim_unsupported = 1;
+
+        INIT_WORK(&rfk->notify_work, b43_notify_rfkill_press);
+
+        err = rfkill_register(rfk->rfkill);
+        if (err)
+                goto error;
+
+        return;
+error:
+        b43warn(dev->wl, "Failed to initialize the RF-kill button\n");
+        rfkill_free(rfk->rfkill);
+        rfk->rfkill = NULL;
+}
+
+void b43_rfkill_exit(struct b43_wldev *dev)
+{
+        struct b43_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;
+}