The transmit_power field in struct wpan_phy is a field with two parts,
the lower six bits containing the signed TX power and the upper two bits
containing a tolerance indicator. This field is already used in some
places and carries the correct semantics, reuse that field and set the
tolerance indicator to +-1dB (which is 00b).
This patch only adds support for this in the at86rf230 driver and the
RF212 chip. Configuration calculation for RF212 is also somewhat basic,
but does the job - the RF212 datasheet gives a large table with
suggested values for combinations of TX power and page/channel, if this
does not work well, we might have to copy the whole table.
Signed-off-by: Phoebe Buckheister <phoebe.buckheis...@itwm.fraunhofer.de>
---
drivers/net/ieee802154/at86rf230.c | 25 ++++++++++++++++
include/linux/nl802154.h | 4 +++
include/net/mac802154.h | 5 ++++
include/net/wpan-phy.h | 2 ++
net/ieee802154/ieee802154.h | 1 +
net/ieee802154/netlink.c | 1 +
net/ieee802154/nl-phy.c | 55 +++++++++++++++++++++++++++++++++++-
net/ieee802154/nl_policy.c | 2 ++
net/mac802154/ieee802154_dev.c | 11 ++++++++
9 files changed, 105 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ieee802154/at86rf230.c
b/drivers/net/ieee802154/at86rf230.c
index 359c40f..d890409 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -752,6 +752,30 @@ at86rf230_set_hw_addr_filt(struct ieee802154_dev *dev,
return 0;
}
+static int
+at86rf212_set_txpower(struct ieee802154_dev *dev, int db)
+{
+ struct at86rf230_local *lp = dev->priv;
+ int rc;
+
+ /* typical maximum output is 5dBm with RG_PHY_TX_PWR 0x60, lower five
+ * bits decrease power in 1dB steps. 0x60 represents extra PA gain of
+ * 0dB.
+ * thus, supported values for db range from -26 to 5, for 31dB of
+ * reduction to 0dB of reduction.
+ */
+ if (db > 5 || db < -26)
+ return -EINVAL;
+
+ db = -(db - 5);
+
+ rc = __at86rf230_write(lp, RG_PHY_TX_PWR, 0x60 | db);
+ if (rc)
+ return rc;
+
+ return 0;
+}
+
static struct ieee802154_ops at86rf230_ops = {
.owner = THIS_MODULE,
.xmit = at86rf230_xmit,
@@ -770,6 +794,7 @@ static struct ieee802154_ops at86rf212_ops = {
.start = at86rf230_start,
.stop = at86rf230_stop,
.set_hw_addr_filt = at86rf230_set_hw_addr_filt,
+ .set_txpower = at86rf212_set_txpower,
};
static void at86rf230_irqwork(struct work_struct *work)
diff --git a/include/linux/nl802154.h b/include/linux/nl802154.h
index fd4f2d1..625d19e 100644
--- a/include/linux/nl802154.h
+++ b/include/linux/nl802154.h
@@ -70,6 +70,8 @@ enum {
IEEE802154_ATTR_PHY_NAME,
IEEE802154_ATTR_DEV_TYPE,
+ IEEE802154_ATTR_TXPOWER,
+
__IEEE802154_ATTR_MAX,
};
@@ -122,6 +124,8 @@ enum {
IEEE802154_ADD_IFACE,
IEEE802154_DEL_IFACE,
+ IEEE802154_SET_PHYPARAMS,
+
__IEEE802154_CMD_MAX,
};
diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index 807d6b7..8bd2785 100644
--- a/include/net/mac802154.h
+++ b/include/net/mac802154.h
@@ -113,6 +113,10 @@ struct ieee802154_dev {
* Set radio for listening on specific address.
* Set the device for listening on specified address.
* Returns either zero, or negative errno.
+ *
+ * set_txpower:
+ * Set radio transmit power in dB. Called with pib_lock held.
+ * Returns either zero, or negative errno.
*/
struct ieee802154_ops {
struct module *owner;
@@ -129,6 +133,7 @@ struct ieee802154_ops {
unsigned long changed);
int (*ieee_addr)(struct ieee802154_dev *dev,
u8 addr[IEEE802154_ADDR_LEN]);
+ int (*set_txpower)(struct ieee802154_dev *dev, int db);
};
/* Basic interface to register ieee802154 device */
diff --git a/include/net/wpan-phy.h b/include/net/wpan-phy.h
index b52bda8..f06c272 100644
--- a/include/net/wpan-phy.h
+++ b/include/net/wpan-phy.h
@@ -54,6 +54,8 @@ struct wpan_phy {
const char *name, int type);
void (*del_iface)(struct wpan_phy *phy, struct net_device *dev);
+ int (*set_txpower)(struct wpan_phy *phy, int db);
+
char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
};
diff --git a/net/ieee802154/ieee802154.h b/net/ieee802154/ieee802154.h
index cee4425..6cbc896 100644
--- a/net/ieee802154/ieee802154.h
+++ b/net/ieee802154/ieee802154.h
@@ -53,6 +53,7 @@ int ieee802154_list_phy(struct sk_buff *skb, struct genl_info
*info);
int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb);
int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info);
int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info);
+int ieee802154_set_phyparams(struct sk_buff *skb, struct genl_info *info);
enum ieee802154_mcgrp_ids {
IEEE802154_COORD_MCGRP,
diff --git a/net/ieee802154/netlink.c b/net/ieee802154/netlink.c
index 43f1b2b..67c151b 100644
--- a/net/ieee802154/netlink.c
+++ b/net/ieee802154/netlink.c
@@ -115,6 +115,7 @@ static const struct genl_ops ieee8021154_ops[] = {
ieee802154_dump_phy),
IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
+ IEEE802154_OP(IEEE802154_SET_PHYPARAMS, ieee802154_set_phyparams),
/* see nl-mac.c */
IEEE802154_OP(IEEE802154_ASSOCIATE_REQ, ieee802154_associate_req),
IEEE802154_OP(IEEE802154_ASSOCIATE_RESP, ieee802154_associate_resp),
diff --git a/net/ieee802154/nl-phy.c b/net/ieee802154/nl-phy.c
index 89b265a..14bc270 100644
--- a/net/ieee802154/nl-phy.c
+++ b/net/ieee802154/nl-phy.c
@@ -55,7 +55,9 @@ static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32
portid,
mutex_lock(&phy->pib_lock);
if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
- nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel))
+ nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel) ||
+ nla_put_s8(msg, IEEE802154_ATTR_TXPOWER,
+ ((signed char) (phy->transmit_power << 2)) >>
2))
goto nla_put_failure;
for (i = 0; i < 32; i++) {
if (phy->channels_supported[i])
@@ -354,3 +356,54 @@ out_dev:
return rc;
}
+
+int ieee802154_set_phyparams(struct sk_buff *skb, struct genl_info *info)
+{
+ struct wpan_phy *phy;
+ const char *name;
+ int txpower;
+ u8 txpower_wpan;
+ int rc = -EINVAL;
+
+ pr_debug("%s\n", __func__);
+
+ if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
+ return -EINVAL;
+
+ name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
+ if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
+ return -EINVAL; /* phy name should be null-terminated */
+
+ txpower = nla_get_s8(info->attrs[IEEE802154_ATTR_TXPOWER]);
+ if (txpower < -64 || txpower > 63)
+ return -EINVAL; /* txpower code subfield is 6 bits long */
+
+ txpower_wpan = ((unsigned char) (txpower << 2)) >> 2;
+
+ phy = wpan_phy_find(name);
+ if (!phy)
+ return -ENODEV;
+
+ if (!phy->set_txpower)
+ goto out;
+
+ mutex_lock(&phy->pib_lock);
+
+ rc = phy->set_txpower(phy, txpower);
+ if (rc < 0) {
+ mutex_unlock(&phy->pib_lock);
+ goto out;
+ }
+
+ phy->transmit_power = txpower_wpan;
+
+ mutex_unlock(&phy->pib_lock);
+
+ wpan_phy_put(phy);
+
+ return 0;
+
+out:
+ wpan_phy_put(phy);
+ return rc;
+}
diff --git a/net/ieee802154/nl_policy.c b/net/ieee802154/nl_policy.c
index 6adda4d..90b1d0d 100644
--- a/net/ieee802154/nl_policy.c
+++ b/net/ieee802154/nl_policy.c
@@ -52,5 +52,7 @@ const struct nla_policy ieee802154_policy[IEEE802154_ATTR_MAX
+ 1] = {
[IEEE802154_ATTR_DURATION] = { .type = NLA_U8, },
[IEEE802154_ATTR_ED_LIST] = { .len = 27 },
[IEEE802154_ATTR_CHANNEL_PAGE_LIST] = { .len = 32 * 4, },
+
+ [IEEE802154_ATTR_TXPOWER] = { .type = NLA_S8, },
};
diff --git a/net/mac802154/ieee802154_dev.c b/net/mac802154/ieee802154_dev.c
index 52ae664..9eb49e0 100644
--- a/net/mac802154/ieee802154_dev.c
+++ b/net/mac802154/ieee802154_dev.c
@@ -165,6 +165,16 @@ err:
return ERR_PTR(err);
}
+static int mac802154_set_txpower(struct wpan_phy *phy, int db)
+{
+ struct mac802154_priv *priv = wpan_phy_priv(phy);
+
+ if (!priv->ops->set_txpower)
+ return -ENOTSUPP;
+
+ return priv->ops->set_txpower(&priv->hw, db);
+}
+
struct ieee802154_dev *
ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
{
@@ -242,6 +252,7 @@ int ieee802154_register_device(struct ieee802154_dev *dev)
priv->phy->add_iface = mac802154_add_iface;
priv->phy->del_iface = mac802154_del_iface;
+ priv->phy->set_txpower = mac802154_set_txpower;
rc = wpan_phy_register(priv->phy);
if (rc < 0)
--
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