rt2x00dev.c

/*
 * Initialization/uninitialization handlers.
 */
static int rt2x00lib_alloc_entries(struct data_ring *ring,
				   const u16 max_entries, const u16 data_size,
				   const u16 desc_size)
{
	struct data_entry *entry;
	unsigned int i;

	ring->stats.limit = max_entries;
	ring->data_size = data_size;
	ring->desc_size = desc_size;

	/*
	 * Allocate all ring entries.
	 */
	entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
	if (!entry)
		return -ENOMEM;

	for (i = 0; i < ring->stats.limit; i++) {
		entry[i].flags = 0;
		entry[i].ring = ring;
		entry[i].skb = NULL;
		entry[i].entry_idx = i;
	}

	ring->entry = entry;

	return 0;
}

static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
{
	struct data_ring *ring;

	/*
	 * Allocate the RX ring.
	 */
	if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
				    rt2x00dev->ops->rxd_size))
		return -ENOMEM;

	/*
	 * First allocate the TX rings.
	 */
	txring_for_each(rt2x00dev, ring) {
		if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
					    rt2x00dev->ops->txd_size))
			return -ENOMEM;
	}

	if (!test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
		return 0;

	/*
	 * Allocate the BEACON ring.
	 */
	if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
				    MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
		return -ENOMEM;

	/*
	 * Allocate the Atim ring.
	 */
	if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
				    DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
		return -ENOMEM;

	return 0;
}

static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
{
	struct data_ring *ring;

	ring_for_each(rt2x00dev, ring) {
		kfree(ring->entry);
		ring->entry = NULL;
	}
}

static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
{
	if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
		return;

	/*
	 * Unregister rfkill.
	 */
	rt2x00rfkill_unregister(rt2x00dev);

	/*
	 * Allow the HW to uninitialize.
	 */
	rt2x00dev->ops->lib->uninitialize(rt2x00dev);

	/*
	 * Free allocated ring entries.
	 */
	rt2x00lib_free_ring_entries(rt2x00dev);
}

static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
{
	int status;

	if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
		return 0;

	/*
	 * Allocate all ring entries.
	 */
	status = rt2x00lib_alloc_ring_entries(rt2x00dev);
	if (status) {
		ERROR(rt2x00dev, "Ring entries allocation failed.\n");
		return status;
	}

	/*
	 * Initialize the device.
	 */
	status = rt2x00dev->ops->lib->initialize(rt2x00dev);
	if (status)
		goto exit;

	__set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);

	/*
	 * Register the rfkill handler.
	 */
	status = rt2x00rfkill_register(rt2x00dev);
	if (status)
		goto exit_unitialize;

	return 0;

exit_unitialize:
	rt2x00lib_uninitialize(rt2x00dev);

exit:
	rt2x00lib_free_ring_entries(rt2x00dev);

	return status;
}

int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
{
	int retval;

	if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
		return 0;

	/*
	 * If this is the first interface which is added,
	 * we should load the firmware now.
	 */
	if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
		retval = rt2x00lib_load_firmware(rt2x00dev);
		if (retval)
			return retval;
	}

	/*
	 * Initialize the device.
	 */
	retval = rt2x00lib_initialize(rt2x00dev);
	if (retval)
		return retval;

	/*
	 * Enable radio.
	 */
	retval = rt2x00lib_enable_radio(rt2x00dev);
	if (retval) {
		rt2x00lib_uninitialize(rt2x00dev);
		return retval;
	}

	__set_bit(DEVICE_STARTED, &rt2x00dev->flags);

	return 0;
}

void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
{
	if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
		return;

	/*
	 * Perhaps we can add something smarter here,
	 * but for now just disabling the radio should do.
	 */
	rt2x00lib_disable_radio(rt2x00dev);

	__clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
}

/*
 * driver allocation handlers.
 */
static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
{
	struct data_ring *ring;
	unsigned int index;

	/*
	 * We need the following rings:
	 * RX: 1
	 * TX: hw->queues
	 * Beacon: 1 (if required)
	 * Atim: 1 (if required)
	 */
	rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
	    (2 * test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags));

	ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
	if (!ring) {
		ERROR(rt2x00dev, "Ring allocation failed.\n");
		return -ENOMEM;
	}

	/*
	 * Initialize pointers
	 */
	rt2x00dev->rx = ring;
	rt2x00dev->tx = &rt2x00dev->rx[1];
	if (test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
		rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];

	/*
	 * Initialize ring parameters.
	 * cw_min: 2^5 = 32.
	 * cw_max: 2^10 = 1024.
	 */
	index = 0;
	ring_for_each(rt2x00dev, ring) {
		ring->rt2x00dev = rt2x00dev;
		ring->queue_idx = index++;
		ring->tx_params.aifs = 2;
		ring->tx_params.cw_min = 5;
		ring->tx_params.cw_max = 10;
	}

	return 0;
}

static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
{
	kfree(rt2x00dev->rx);
	rt2x00dev->rx = NULL;
	rt2x00dev->tx = NULL;
	rt2x00dev->bcn = NULL;
}

int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
{
	int retval = -ENOMEM;

	/*
	 * Let the driver probe the device to detect the capabilities.
	 */
	retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
	if (retval) {
		ERROR(rt2x00dev, "Failed to allocate device.\n");
		goto exit;
	}

	/*
	 * Initialize configuration work.
	 */
	INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
	INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
	INIT_WORK(&rt2x00dev->config_work, rt2x00lib_configuration_scheduled);
	INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);

	/*
	 * Reset current working type.
	 */
	rt2x00dev->interface.type = IEEE80211_IF_TYPE_INVALID;

	/*
	 * Allocate ring array.
	 */
	retval = rt2x00lib_alloc_rings(rt2x00dev);
	if (retval)
		goto exit;

	/*
	 * Initialize ieee80211 structure.
	 */
	retval = rt2x00lib_probe_hw(rt2x00dev);
	if (retval) {
		ERROR(rt2x00dev, "Failed to initialize hw.\n");
		goto exit;
	}

	/*
	 * Allocatie rfkill.
	 */
	retval = rt2x00rfkill_allocate(rt2x00dev);
	if (retval)
		goto exit;

	/*
	 * Open the debugfs entry.
	 */
	rt2x00debug_register(rt2x00dev);

	__set_bit(DEVICE_PRESENT, &rt2x00dev->flags);

	return 0;

exit:
	rt2x00lib_remove_dev(rt2x00dev);

	return retval;
}
EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);

void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
{
	__clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);

	/*
	 * Disable radio.
	 */
	rt2x00lib_disable_radio(rt2x00dev);

	/*
	 * Uninitialize device.
	 */
	rt2x00lib_uninitialize(rt2x00dev);

	/*
	 * Close debugfs entry.
	 */
	rt2x00debug_deregister(rt2x00dev);

	/*
	 * Free rfkill
	 */
	rt2x00rfkill_free(rt2x00dev);

	/*
	 * Free ieee80211_hw memory.
	 */
	rt2x00lib_remove_hw(rt2x00dev);

	/*
	 * Free firmware image.
	 */
	rt2x00lib_free_firmware(rt2x00dev);

	/*
	 * Free ring structures.
	 */
	rt2x00lib_free_rings(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);

/*
 * Device state handlers
 */
#ifdef CONFIG_PM
int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
{
	int retval;

	NOTICE(rt2x00dev, "Going to sleep.\n");
	__clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);

	/*
	 * Only continue if mac80211 has open interfaces.
	 */
	if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
		goto exit;
	__set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);

	/*
	 * Disable radio and unitialize all items
	 * that must be recreated on resume.
	 */
	rt2x00lib_stop(rt2x00dev);
	rt2x00lib_uninitialize(rt2x00dev);
	rt2x00debug_deregister(rt2x00dev);

exit:
	/*
	 * Set device mode to sleep for power management.
	 */
	retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
	if (retval)
		return retval;

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_suspend);

int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
{
	struct interface *intf = &rt2x00dev->interface;
	int retval;

	NOTICE(rt2x00dev, "Waking up.\n");

	/*
	 * Open the debugfs entry.
	 */
	rt2x00debug_register(rt2x00dev);

	/*
	 * Only continue if mac80211 had open interfaces.
	 */
	if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
		return 0;

	/*
	 * Reinitialize device and all active interfaces.
	 */
	retval = rt2x00lib_start(rt2x00dev);
	if (retval)
		goto exit;

	/*
	 * Reconfigure device.
	 */
	rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
	if (!rt2x00dev->hw->conf.radio_enabled)
		rt2x00lib_disable_radio(rt2x00dev);

	rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
	rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
	rt2x00lib_config_type(rt2x00dev, intf->type);

	/*
	 * We are ready again to receive requests from mac80211.
	 */
	__set_bit(DEVICE_PRESENT, &rt2x00dev->flags);

	/*
	 * It is possible that during that mac80211 has attempted
	 * to send frames while we were suspending or resuming.
	 * In that case we have disabled the TX queue and should
	 * now enable it again
	 */
	ieee80211_start_queues(rt2x00dev->hw);

	/*
	 * When in Master or Ad-hoc mode,
	 * restart Beacon transmitting by faking a beacondone event.
	 */
	if (intf->type == IEEE80211_IF_TYPE_AP ||
	    intf->type == IEEE80211_IF_TYPE_IBSS)
		rt2x00lib_beacondone(rt2x00dev);

	return 0;

exit:
	rt2x00lib_disable_radio(rt2x00dev);
	rt2x00lib_uninitialize(rt2x00dev);
	rt2x00debug_deregister(rt2x00dev);

	return retval;
}
EXPORT_SYMBOL_GPL(rt2x00lib_resume);
#endif /* CONFIG_PM */

/*
 * rt2x00lib module information.
 */
MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("rt2x00 library");
MODULE_LICENSE("GPL");