diff options
| author | Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de> | 2014-02-17 11:34:08 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-02-17 16:42:38 -0500 |
| commit | 9b2777d6089bcd7fb035847f907280560fe233c8 (patch) | |
| tree | 868e579924e3c6cd154996acfef67fb9157e8b26 /drivers/net/ieee802154/at86rf230.c | |
| parent | 5b520bbb538da7f7122b1e5dc85f2b4c592d4781 (diff) | |
| download | lwn-9b2777d6089bcd7fb035847f907280560fe233c8.tar.gz lwn-9b2777d6089bcd7fb035847f907280560fe233c8.zip | |
ieee802154: add TX power control to wpan_phy
Replace the current u8 transmit_power in wpan_phy with s8 transmit_power.
The u8 field contained the actual tx power and a tolerance field,
which no physical radio every used. Adjust sysfs entries to keep
compatibility with userspace, give tolerances of +-1dB statically there.
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.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ieee802154/at86rf230.c')
| -rw-r--r-- | drivers/net/ieee802154/at86rf230.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c index bd1ef0b3bee9..9afb4b9d7c93 100644 --- a/drivers/net/ieee802154/at86rf230.c +++ b/drivers/net/ieee802154/at86rf230.c @@ -753,6 +753,30 @@ 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, @@ -771,6 +795,7 @@ 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) |