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ieee802154: add support for CCA mode in wpan phys

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The standard describes four modes of clear channel assesment: "energy
above threshold", "carrier found", and the logical and/or of these two.
Support for CCA mode setting is included in the at86rf230 driver,
predicated for RF212 chips.

Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Phoebe Buckheister 2014-02-17 11:34:11 +01:00 committed by David S. Miller
parent 84dda3c648
commit ba08fea53a
7 changed files with 57 additions and 3 deletions
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9
drivers/net/ieee802154/at86rf230.c
View File

@ -794,6 +794,14 @@ at86rf212_set_lbt(struct ieee802154_dev *dev, bool on)
return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
}
static int
at86rf212_set_cca_mode(struct ieee802154_dev *dev, u8 mode)
{
struct at86rf230_local *lp = dev->priv;
return at86rf230_write_subreg(lp, SR_CCA_MODE, mode);
}
static struct ieee802154_ops at86rf230_ops = {
.owner = THIS_MODULE,
.xmit = at86rf230_xmit,
@ -814,6 +822,7 @@ static struct ieee802154_ops at86rf212_ops = {
.set_hw_addr_filt = at86rf230_set_hw_addr_filt,
.set_txpower = at86rf212_set_txpower,
.set_lbt = at86rf212_set_lbt,
.set_cca_mode = at86rf212_set_cca_mode,
};
static void at86rf230_irqwork(struct work_struct *work)

1
include/linux/nl802154.h
View File

@ -72,6 +72,7 @@ enum {
IEEE802154_ATTR_TXPOWER,
IEEE802154_ATTR_LBT_ENABLED,
IEEE802154_ATTR_CCA_MODE,
__IEEE802154_ATTR_MAX,
};

5
include/net/mac802154.h
View File

@ -122,6 +122,10 @@ struct ieee802154_dev {
* Enables or disables listen before talk on the device. Called with
* pib_lock held.
* Returns either zero, or negative errno.
*
* set_cca_mode
* Sets the CCA mode used by the device. Called with pib_lock held.
* Returns either zero, or negative errno.
*/
struct ieee802154_ops {
struct module *owner;
@ -140,6 +144,7 @@ struct ieee802154_ops {
u8 addr[IEEE802154_ADDR_LEN]);
int (*set_txpower)(struct ieee802154_dev *dev, int db);
int (*set_lbt)(struct ieee802154_dev *dev, bool on);
int (*set_cca_mode)(struct ieee802154_dev *dev, u8 mode);
};
/* Basic interface to register ieee802154 device */

1
include/net/wpan-phy.h
View File

@ -58,6 +58,7 @@ struct wpan_phy {
int (*set_txpower)(struct wpan_phy *phy, int db);
int (*set_lbt)(struct wpan_phy *phy, bool on);
int (*set_cca_mode)(struct wpan_phy *phy, u8 cca_mode);
char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
};

32
net/ieee802154/nl-phy.c
View File

@ -57,7 +57,8 @@ static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 portid,
nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel) ||
nla_put_s8(msg, IEEE802154_ATTR_TXPOWER, phy->transmit_power) ||
nla_put_u8(msg, IEEE802154_ATTR_LBT_ENABLED, phy->lbt))
nla_put_u8(msg, IEEE802154_ATTR_LBT_ENABLED, phy->lbt) ||
nla_put_u8(msg, IEEE802154_ATTR_CCA_MODE, phy->cca_mode))
goto nla_put_failure;
for (i = 0; i < 32; i++) {
if (phy->channels_supported[i])
@ -385,6 +386,23 @@ static int phy_set_lbt(struct wpan_phy *phy, struct genl_info *info)
return 0;
}
static int phy_set_cca_mode(struct wpan_phy *phy, struct genl_info *info)
{
u8 mode = nla_get_u8(info->attrs[IEEE802154_ATTR_CCA_MODE]);
int rc;
if (mode > 3)
return -EINVAL;
rc = phy->set_cca_mode(phy, mode);
if (rc < 0)
return rc;
phy->cca_mode = mode;
return 0;
}
int ieee802154_set_phyparams(struct sk_buff *skb, struct genl_info *info)
{
struct wpan_phy *phy;
@ -394,7 +412,8 @@ int ieee802154_set_phyparams(struct sk_buff *skb, struct genl_info *info)
pr_debug("%s\n", __func__);
if (!info->attrs[IEEE802154_ATTR_PHY_NAME] &&
!info->attrs[IEEE802154_ATTR_LBT_ENABLED])
!info->attrs[IEEE802154_ATTR_LBT_ENABLED] &&
!info->attrs[IEEE802154_ATTR_CCA_MODE])
return -EINVAL;
name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
@ -406,7 +425,8 @@ int ieee802154_set_phyparams(struct sk_buff *skb, struct genl_info *info)
return -ENODEV;
if ((!phy->set_txpower && info->attrs[IEEE802154_ATTR_TXPOWER]) ||
(!phy->set_lbt && info->attrs[IEEE802154_ATTR_LBT_ENABLED]))
(!phy->set_lbt && info->attrs[IEEE802154_ATTR_LBT_ENABLED]) ||
(!phy->set_cca_mode && info->attrs[IEEE802154_ATTR_CCA_MODE]))
goto out;
mutex_lock(&phy->pib_lock);
@ -423,6 +443,12 @@ int ieee802154_set_phyparams(struct sk_buff *skb, struct genl_info *info)
goto error;
}
if (info->attrs[IEEE802154_ATTR_CCA_MODE]) {
rc = phy_set_cca_mode(phy, info);
if (rc < 0)
goto error;
}
mutex_unlock(&phy->pib_lock);
wpan_phy_put(phy);

1
net/ieee802154/nl_policy.c
View File

@ -55,5 +55,6 @@ const struct nla_policy ieee802154_policy[IEEE802154_ATTR_MAX + 1] = {
[IEEE802154_ATTR_TXPOWER] = { .type = NLA_S8, },
[IEEE802154_ATTR_LBT_ENABLED] = { .type = NLA_U8, },
[IEEE802154_ATTR_CCA_MODE] = { .type = NLA_U8, },
};

11
net/mac802154/ieee802154_dev.c
View File

@ -185,6 +185,16 @@ static int mac802154_set_lbt(struct wpan_phy *phy, bool on)
return priv->ops->set_lbt(&priv->hw, on);
}
static int mac802154_set_cca_mode(struct wpan_phy *phy, u8 mode)
{
struct mac802154_priv *priv = wpan_phy_priv(phy);
if (!priv->ops->set_cca_mode)
return -ENOTSUPP;
return priv->ops->set_cca_mode(&priv->hw, mode);
}
struct ieee802154_dev *
ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
{
@ -264,6 +274,7 @@ int ieee802154_register_device(struct ieee802154_dev *dev)
priv->phy->del_iface = mac802154_del_iface;
priv->phy->set_txpower = mac802154_set_txpower;
priv->phy->set_lbt = mac802154_set_lbt;
priv->phy->set_cca_mode = mac802154_set_cca_mode;
rc = wpan_phy_register(priv->phy);
if (rc < 0)