The MRF24j40 device supports the use of external receivers/transmitters.
Microchip literature refers to them as LNA and PA respectively.
However, if external receivers/transmitters are present, register
"TESTMODE" has to be programmed with value 0f.
This patch adds a boolean module parameter ext_rx_tx. Setting it to true
configures the driver to adjust the mrf24j40 operation to work
with external receivers/transmitters.
Microchip's MRF24J40MB module is one instance that has external PA/LNA.
Without this new module parameter, transmission between two of these
modules was limited to less than 5 feet. With the module parameter set,
the range increased to well above 100 feet.
Signed-off-by: Walter Mack <wmack@xxxxxxxxxxxxxxx>
---
drivers/net/ieee802154/mrf24j40.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/net/ieee802154/mrf24j40.c b/drivers/net/ieee802154/mrf24j40.c
index 9e6a124..e9cb5c6 100644
--- a/drivers/net/ieee802154/mrf24j40.c
+++ b/drivers/net/ieee802154/mrf24j40.c
@@ -26,6 +26,10 @@
#include <net/mac802154.h>
#include <net/ieee802154.h>
+static bool ext_rx_tx;
+module_param(ext_rx_tx, bool, 0444);
+MODULE_PARM_DESC(ext_rx_tx, "turn on statemachine to manage external tx/rx");
+
/* MRF24J40 Short Address Registers */
#define REG_RXMCR 0x00 /* Receive MAC control */
#define REG_PANIDL 0x01 /* PAN ID (low) */
@@ -63,6 +67,8 @@
#define REG_SLPCON1 0x220
#define REG_WAKETIMEL 0x222 /* Wake-up Time Match Value Low */
#define REG_WAKETIMEH 0x223 /* Wake-up Time Match Value High */
+#define REG_TESTMODE 0x22f /* test mode and state machine control register */
+
#define REG_RX_FIFO 0x300 /* Receive FIFO */
/* Device configuration: Only channels 11-26 on page 0 are supported. */
@@ -679,6 +685,12 @@ static int mrf24j40_hw_init(struct mrf24j40 *devrec)
udelay(192);
+ if (ext_rx_tx) {
+ ret = write_long_reg(devrec, REG_TESTMODE, 0x0f);
+ if (ret)
+ goto err_ret;
+ }
+
/* Set RX Mode. RXMCR<1:0>: 0x0 normal, 0x1 promisc, 0x2 error */
ret = read_short_reg(devrec, REG_RXMCR, &val);
if (ret)
--
1.9.1
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