From: Henrique de Moraes Holschuh Date: Mon, 23 Jun 2008 20:23:00 +0000 (-0300) Subject: rfkill: add read-write rfkill switch support X-Git-Tag: v2.6.27-rc1~969^2~254^2~58 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=801e49af4c1a9b988ba0d25de2b368c99c3bf2b3;p=linux-2.6 rfkill: add read-write rfkill switch support Currently, rfkill support for read/write rfkill switches is hacked through a round-trip over the input layer and rfkill-input to let a driver sync rfkill->state to hardware changes. This is buggy and sub-optimal. It causes real problems. It is best to think of the rfkill class as supporting only write-only switches at the moment. In order to implement the read/write functionality properly: Add a get_state() hook that is called by the class every time it needs to fetch the current state of the switch. Add a call to this hook every time the *current* state of the radio plays a role in a decision. Also add a force_state() method that can be used to forcefully syncronize the class' idea of the current state of the switch. This allows for a faster implementation of the read/write functionality, as a driver which get events on switch changes can avoid the need for a get_state() hook. If the get_state() hook is left as NULL, current behaviour is maintained, so this change is fully backwards compatible with the current rfkill drivers. For hardware that issues events when the rfkill state changes, leave get_state() NULL in the rfkill struct, set the initial state properly before registering with the rfkill class, and use the force_state() method in the driver to keep the rfkill interface up-to-date. get_state() can be called by the class from atomic context. It must not sleep. Signed-off-by: Henrique de Moraes Holschuh Acked-by: Ivo van Doorn Cc: Dmitry Torokhov Signed-off-by: John W. Linville --- diff --git a/include/linux/rfkill.h b/include/linux/rfkill.h index ca89ae1b02..844e961148 100644 --- a/include/linux/rfkill.h +++ b/include/linux/rfkill.h @@ -61,6 +61,8 @@ enum rfkill_state { * @data: Pointer to the RF button drivers private data which will be * passed along when toggling radio state. * @toggle_radio(): Mandatory handler to control state of the radio. + * @get_state(): handler to read current radio state from hardware, + * may be called from atomic context, should return 0 on success. * @led_trigger: A LED trigger for this button's LED. * @dev: Device structure integrating the switch into device tree. * @node: Used to place switch into list of all switches known to the @@ -80,6 +82,7 @@ struct rfkill { void *data; int (*toggle_radio)(void *data, enum rfkill_state state); + int (*get_state)(void *data, enum rfkill_state *state); #ifdef CONFIG_RFKILL_LEDS struct led_trigger led_trigger; @@ -95,6 +98,8 @@ void rfkill_free(struct rfkill *rfkill); int rfkill_register(struct rfkill *rfkill); void rfkill_unregister(struct rfkill *rfkill); +int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state); + /** * rfkill_get_led_name - Get the LED trigger name for the button's LED. * This function might return a NULL pointer if registering of the diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c index 3edc585dcf..4ae4486c77 100644 --- a/net/rfkill/rfkill.c +++ b/net/rfkill/rfkill.c @@ -62,19 +62,39 @@ static void rfkill_led_trigger(struct rfkill *rfkill, #endif /* CONFIG_RFKILL_LEDS */ } +static void update_rfkill_state(struct rfkill *rfkill) +{ + enum rfkill_state newstate; + + if (rfkill->get_state) { + mutex_lock(&rfkill->mutex); + if (!rfkill->get_state(rfkill->data, &newstate)) + rfkill->state = newstate; + mutex_unlock(&rfkill->mutex); + } +} + static int rfkill_toggle_radio(struct rfkill *rfkill, enum rfkill_state state) { int retval = 0; + enum rfkill_state oldstate, newstate; + + oldstate = rfkill->state; + + if (rfkill->get_state && + !rfkill->get_state(rfkill->data, &newstate)) + rfkill->state = newstate; if (state != rfkill->state) { retval = rfkill->toggle_radio(rfkill->data, state); - if (!retval) { + if (!retval) rfkill->state = state; - rfkill_led_trigger(rfkill, state); - } } + if (rfkill->state != oldstate) + rfkill_led_trigger(rfkill, rfkill->state); + return retval; } @@ -105,6 +125,32 @@ void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state) } EXPORT_SYMBOL(rfkill_switch_all); +/** + * rfkill_force_state - Force the internal rfkill radio state + * @rfkill: pointer to the rfkill class to modify. + * @state: the current radio state the class should be forced to. + * + * This function updates the internal state of the radio cached + * by the rfkill class. It should be used when the driver gets + * a notification by the firmware/hardware of the current *real* + * state of the radio rfkill switch. + * + * It may not be called from an atomic context. + */ +int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state) +{ + if (state != RFKILL_STATE_OFF && + state != RFKILL_STATE_ON) + return -EINVAL; + + mutex_lock(&rfkill->mutex); + rfkill->state = state; + mutex_unlock(&rfkill->mutex); + + return 0; +} +EXPORT_SYMBOL(rfkill_force_state); + static ssize_t rfkill_name_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -147,6 +193,7 @@ static ssize_t rfkill_state_show(struct device *dev, { struct rfkill *rfkill = to_rfkill(dev); + update_rfkill_state(rfkill); return sprintf(buf, "%d\n", rfkill->state); }