[RFKILL]: Add support for hardware-only rfkill buttons
Buttons that work directly on hardware cannot support the "user_claim" functionality. Add a flag to signal this and return -EOPNOTSUPP in this case. b43 is such a device. Signed-off-by: Michael Buesch <mb@bu3sch.de> Acked-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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2 changed files with 9 additions and 1 deletions
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@ -52,6 +52,8 @@ enum rfkill_state {
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* @type: Radio type which the button controls, the value stored
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* here should be a value from enum rfkill_type.
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* @state: State of the switch (on/off).
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* @user_claim_unsupported: Whether the hardware supports exclusive
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* RF-kill control by userspace. Set this before registering.
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* @user_claim: Set when the switch is controlled exlusively by userspace.
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* @mutex: Guards switch state transitions
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* @data: Pointer to the RF button drivers private data which will be
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@ -69,6 +71,7 @@ struct rfkill {
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enum rfkill_type type;
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enum rfkill_state state;
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bool user_claim_unsupported;
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bool user_claim;
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struct mutex mutex;
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@ -190,6 +190,10 @@ static ssize_t rfkill_claim_store(struct device *dev,
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if (error)
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return error;
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if (rfkill->user_claim_unsupported) {
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error = -EOPNOTSUPP;
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goto out_unlock;
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}
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if (rfkill->user_claim != claim) {
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if (!claim)
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rfkill_toggle_radio(rfkill,
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@ -197,9 +201,10 @@ static ssize_t rfkill_claim_store(struct device *dev,
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rfkill->user_claim = claim;
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}
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out_unlock:
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mutex_unlock(&rfkill_mutex);
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return count;
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return error ? error : count;
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}
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static struct device_attribute rfkill_dev_attrs[] = {
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