Driver for the Microchip MRF24J40 802.15.4 WPAN module.
---
This is a first pass. All the places marked TODO contain things which I
think need to be fixed before merge. Some of these contain questions for
the Linux-Zigbee team. All comments appreciated.
I still plan change the structure of the SPI read functions to return an
error code.
---
drivers/ieee802154/Kconfig | 1 +
drivers/ieee802154/mrf24j40.c | 747 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 748 insertions(+), 0 deletions(-)
create mode 100644 drivers/ieee802154/mrf24j40.c
diff --git a/drivers/ieee802154/Kconfig b/drivers/ieee802154/Kconfig
index a9a6145..5703e7a 100644
--- a/drivers/ieee802154/Kconfig
+++ b/drivers/ieee802154/Kconfig
@@ -20,6 +20,7 @@ config IEEE802154_FAKEHARD
This driver can also be built as a module. To do so say M here.
The module will be called 'fakehard'.
+<<<<<<< HEAD
config IEEE802154_FAKELB
depends on IEEE802154_DRIVERS && MAC802154
tristate "Fake LR-WPAN driver with several interconnected devices"
diff --git a/drivers/ieee802154/mrf24j40.c b/drivers/ieee802154/mrf24j40.c
new file mode 100644
index 0000000..e7bef5b
--- /dev/null
+++ b/drivers/ieee802154/mrf24j40.c
@@ -0,0 +1,747 @@
+/*
+ * Driver for Microchip MRF24J40 802.15.4 Wireless-PAN Networking controller
+ *
+ * Copyright (C) 2012 Alan Ott <a...@signal11.us>
+ * Signal 11 Software
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/af_ieee802154.h>
+#include <net/ieee802154.h>
+#include <net/ieee802154_netdev.h>
+#include <net/nl802154.h>
+#include <net/wpan-phy.h>
+#include <net/mac802154.h>
+
+/* MRF24J40 Short Address Registers */
+#define REG_RXMCR 0x00 /* Receive MAC control */
+#define REG_PANIDL 0x01 /* PAN ID (low) */
+#define REG_PANIDH 0x02 /* PAN ID (high) */
+#define REG_SADRL 0x03 /* Short address (low) */
+#define REG_SADRH 0x04 /* Short address (high) */
+#define REG_EADR0 0x05 /* Long address (low) (high is EADR7) */
+#define REG_TXMCR 0x11 /* Transmit MAC control */
+#define REG_PACON0 0x16 /* Power Amplifier Control */
+#define REG_PACON1 0x17 /* Power Amplifier Control */
+#define REG_PACON2 0x18 /* Power Amplifier Control */
+#define REG_TXNCON 0x1B /* Transmit Normal FIFO Control */
+#define REG_TXSTAT 0x24 /* TX MAC Status Register */
+#define REG_SOFTRST 0x2A /* Soft Reset */
+#define REG_TXSTBL 0x2E /* TX Stabilization */
+#define REG_INTSTAT 0x31 /* Interrupt Status */
+#define REG_INTCON 0x32 /* Interrupt Control */
+#define REG_RFCTL 0x36 /* RF Control Mode Register */
+#define REG_BBREG1 0x39 /* Baseband Registers */
+#define REG_BBREG2 0x3A /* */
+#define REG_BBREG6 0x3E /* */
+#define REG_CCAEDTH 0x3F /* Energy Detection Threshold */
+
+/* MRF24J40 Long Address Registers */
+#define REG_RFCON0 0x200 /* RF Control Registers */
+#define REG_RFCON1 0x201
+#define REG_RFCON2 0x202
+#define REG_RFCON3 0x203
+#define REG_RFCON5 0x205
+#define REG_RFCON6 0x206
+#define REG_RFCON7 0x207
+#define REG_RFCON8 0x208
+#define REG_RSSI 0x210
+#define REG_SLPCON0 0x211 /* Sleep Clock Control Registers */
+#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_RX_FIFO 0x300 /* Receive FIFO */
+
+/** Device configuration **/
+/* Only channels 11-26 on page 0 are supported. */
+#define MRF24J40_CHAN_MIN 11
+#define MRF24J40_CHAN_MAX 26
+#define CHANNEL_MASK (((u32)1 << (MRF24J40_CHAN_MAX + 1)) \
+ - ((u32)1 << MRF24J40_CHAN_MIN))
+
+/* Device Private Data */
+struct mrf24j40 {
+ struct spi_device *spi;
+ struct ieee802154_dev *dev;
+
+ struct mutex mutex;
+ struct completion tx_complete;
+ struct work_struct irqwork;
+ u8 *buf; /* 3 bytes. Used for SPI single-register transfers. */
+};
+
+/* Read/Write SPI Commands for Short and Long Address registers. */
+#define MRF24J40_READSHORT(reg) ((reg) << 1)
+#define MRF24J40_WRITESHORT(reg) ((reg) << 1 | 1)
+#define MRF24J40_READLONG(reg) (1 << 15 | (reg) << 5)
+#define MRF24J40_WRITELONG(reg) (1 << 15 | (reg) << 5 | 1 << 4)
+
+/* Speed to run the device at. TODO: Get the real max value from
+ someone at Microchip since it isn't in the datasheet. */
+#define SPI_SPEED_HZ 1000000
+
+#define printdev(X) (&X->spi->dev)
+
+static int write_short_reg(struct mrf24j40 *devrec, __u8 reg, __u8 value)
+{
+ int ret;
+ struct spi_message msg;
+ struct spi_transfer xfer = {
+ .len = 2,
+ .tx_buf = devrec->buf,
+ .rx_buf = devrec->buf,
+ };
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+ mutex_lock(&devrec->mutex);
+ devrec->buf[0] = MRF24J40_WRITESHORT(reg);
+ devrec->buf[1] = value;
+ ret = spi_sync(devrec->spi, &msg);
+ if (ret)
+ goto out;
+
+out:
+ mutex_unlock(&devrec->mutex);
+ return ret;
+}
+
+static __u8 read_short_reg(struct mrf24j40 *devrec, __u8 reg)
+{
+ int ret;
+ struct spi_message msg;
+ struct spi_transfer xfer = {
+ .len = 2,
+ .tx_buf = devrec->buf,
+ .rx_buf = devrec->buf,
+ };
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+ mutex_lock(&devrec->mutex);
+ devrec->buf[0] = MRF24J40_READSHORT(reg);
+ devrec->buf[1] = 0;
+ ret = spi_sync(devrec->spi, &msg);
+ if (ret) {
+ printk("SPI read Failed\n");
+ goto out;
+ }
+ else
+ ret = devrec->buf[1];
+
+out:
+ mutex_unlock(&devrec->mutex);
+ return ret;
+}
+
+static u8 read_long_reg(struct mrf24j40 *devrec, __u16 reg)
+{
+ int ret;
+ u16 cmd;
+ struct spi_message msg;
+ struct spi_transfer xfer = {
+ .len = 3,
+ .tx_buf = devrec->buf,
+ .rx_buf = devrec->buf,
+ };
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+ cmd = MRF24J40_READLONG(reg);
+ mutex_lock(&devrec->mutex);
+ devrec->buf[0] = cmd >> 8 & 0xff;
+ devrec->buf[1] = cmd & 0xff;
+ devrec->buf[2] = 0;
+ ret = spi_sync(devrec->spi, &msg);
+ if (ret) {
+ printk("SPI read Failed\n");
+ goto out;
+ }
+ else
+ ret = devrec->buf[2];
+
+out:
+ mutex_unlock(&devrec->mutex);
+ return ret;
+}
+
+static int write_long_reg(struct mrf24j40 *devrec, __u16 reg, u8 val)
+{
+ int ret;
+ u16 cmd;
+ struct spi_message msg;
+ struct spi_transfer xfer = {
+ .len = 3,
+ .tx_buf = devrec->buf,
+ .rx_buf = devrec->buf,
+ };
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+ cmd = MRF24J40_WRITELONG(reg);
+ mutex_lock(&devrec->mutex);
+ devrec->buf[0] = cmd >> 8 & 0xff;
+ devrec->buf[1] = cmd & 0xff;
+ devrec->buf[2] = val;
+ ret = spi_sync(devrec->spi, &msg);
+ if (ret) {
+ printk("SPI write Failed\n");
+ goto out;
+ }
+
+out:
+ mutex_unlock(&devrec->mutex);
+ return ret;
+}
+
+/* This function relies on an undocumented write method. Once a write command
+ and address is set, as many bytes of data as desired can be clocked into
+ the device. The datasheet only shows setting one byte at a time. */
+static int write_tx_buf(struct mrf24j40 *devrec, __u16 reg, const u8 *data,
size_t length)
+{
+ int ret;
+ u16 cmd;
+ u8 lengths[2];
+ struct spi_message msg;
+ struct spi_transfer addr_xfer = {
+ .len = 2,
+ .tx_buf = devrec->buf,
+ };
+ struct spi_transfer lengths_xfer = {
+ .len = 2,
+ .tx_buf = &lengths, // TODO: Is DMA really required for SPI?
+ };
+ struct spi_transfer data_xfer = {
+ .len = length,
+ .tx_buf = data,
+ };
+
+ BUG_ON(length > 126);
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&addr_xfer, &msg);
+ spi_message_add_tail(&lengths_xfer, &msg);
+ spi_message_add_tail(&data_xfer, &msg);
+ cmd = MRF24J40_WRITELONG(reg);
+ mutex_lock(&devrec->mutex);
+ devrec->buf[0] = cmd >> 8 & 0xff;
+ devrec->buf[1] = cmd & 0xff;
+ lengths[0] = 0x0; /* Header Length. Set to 0 for now. TODO */
+ lengths[1] = length; /* Total length */
+ ret = spi_sync(devrec->spi, &msg);
+ if (ret) {
+ printk("SPI write Failed\n");
+ goto out;
+ }
+
+out:
+ mutex_unlock(&devrec->mutex);
+ return ret;
+}
+
+static int mrf24j40_read_rx_buf(struct mrf24j40 *devrec, u8 *data, u8 *len, u8
*lqi)
+{
+ u8 val;
+ u8 addr[2];
+ u8 lqi_rssi[2];
+ u16 cmd;
+ int ret;
+ struct spi_message msg;
+ struct spi_transfer addr_xfer = {
+ .len = 2,
+ .tx_buf = &addr,
+ };
+ struct spi_transfer data_xfer = {
+ .len = 0x0, /* set below */
+ .rx_buf = data,
+ };
+ struct spi_transfer status_xfer = {
+ .len = 2,
+ .rx_buf = &lqi_rssi,
+ };
+
+ /* Get the length of the data in the RX FIFO. */
+ val = read_long_reg(devrec, REG_RX_FIFO);
+
+ if (val > 143) {
+ /* RX FIFO on the MRF24J40 is 144 bytes long. One byte is
+ used at the beginning of the buffer for the length. */
+ dev_err(printdev(devrec), "Invalid length read from device.
Performing short read.\n");
+ val = 143;
+ }
+
+ if (val > *len) {
+ /* We read 2 bytes more than the length at 0x300. */
+ dev_err(printdev(devrec), "Buffer not big enough. Performing
short read\n");
+ val = *len;
+ }
+
+ /* Set up the commands to read the data. */
+ cmd = MRF24J40_READLONG(REG_RX_FIFO+1);
+ addr[0] = cmd >> 8 & 0xff;
+ addr[1] = cmd & 0xff;
+ data_xfer.len = val;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&addr_xfer, &msg);
+ spi_message_add_tail(&data_xfer, &msg);
+ spi_message_add_tail(&status_xfer, &msg);
+ ret = spi_sync(devrec->spi, &msg);
+ if (ret) {
+ printk("SPI RX Buffer Read Failed.\n");
+ goto out;
+ }
+
+ *lqi = lqi_rssi[0];
+ *len = val;
+
+#ifdef DEBUG
+ {
+ int i;
+ printk(KERN_DEBUG "%d bytes received\n", *len);
+ printk(KERN_DEBUG " ");
+ for (i = 0; i < *len; i++) {
+ printk("%02hhx ", data[i]);
+ }
+ printk("\n");
+ printk(KERN_DEBUG " %02hhx %02hhx\n",
+ lqi_rssi[0], lqi_rssi[1]);
+ }
+#endif
+
+out:
+ return ret;
+}
+
+
+
+static int mrf24j40_tx(struct ieee802154_dev *dev, struct sk_buff *skb)
+{
+ struct mrf24j40 *devrec = dev->priv;
+ u8 val;
+ int ret = 0;
+
+ dev_dbg(printdev(devrec), "tx packet of %d bytes\n", skb->len);
+
+ ret = write_tx_buf(devrec, 0x000, skb->data, skb->len);
+ if (ret)
+ goto err;
+
+ /* Set TXNTRIG bit of TXNCON to send packet */
+ val = read_short_reg(devrec, REG_TXNCON);
+ val |= 0x1;
+ val &= ~((u8)0x4);
+ write_short_reg(devrec, REG_TXNCON, val);
+
+ INIT_COMPLETION(devrec->tx_complete);
+
+ /* Wait for the device to send the TX complete interrupt. */
+ ret = wait_for_completion_interruptible_timeout(
+ &devrec->tx_complete,
+ 5 * HZ);
+ if (ret == -ERESTARTSYS)
+ goto err;
+ if (ret == 0) {
+ ret = -ETIMEDOUT;
+ goto err;
+ }
+
+ /* Check for send error from the device. */
+ val = read_short_reg(devrec, REG_TXSTAT);
+ if (val & 0x1) {
+ dev_err(printdev(devrec), "Error Sending. Retry count
exceeded\n");
+ ret = -ECOMM; // TODO: Better error code ?
+ }
+ else
+ dev_dbg(printdev(devrec), "Packet Sent\n");
+
+err:
+
+ return ret;
+}
+
+static int mrf24j40_ed(struct ieee802154_dev *dev, u8 *level)
+{
+ // TODO:
+ printk(KERN_WARNING "mrf24j40: ed not implemented\n");
+ *level = 0;
+ return 0;
+}
+
+static int mrf24j40_start(struct ieee802154_dev *dev)
+{
+ struct mrf24j40 *devrec = dev->priv;
+ u8 val;
+
+ dev_dbg(printdev(devrec), "start\n");
+
+ val = read_short_reg(devrec, REG_INTCON);
+ val &= ~((u8)(0x1|0x8)); /* Clear TXNIE and RXIE. Enable interrupts */
+ write_short_reg(devrec, REG_INTCON, val);
+
+ return 0;
+}
+
+static void mrf24j40_stop(struct ieee802154_dev *dev)
+{
+ struct mrf24j40 *devrec = dev->priv;
+ u8 val;
+ dev_dbg(printdev(devrec), "stop\n");
+
+ val = read_short_reg(devrec, REG_INTCON);
+ val |= 0x1|0x8; /* Set TXNIE and RXIE. Disable Interrupts */
+ write_short_reg(devrec, REG_INTCON, val);
+
+ return;
+}
+
+static int mrf24j40_set_channel(struct ieee802154_dev *dev, int page, int
channel)
+{
+ struct mrf24j40 *devrec = dev->priv;
+ __u8 val;
+
+ dev_dbg(printdev(devrec), "Set Channel %d\n", channel);
+
+ BUG_ON(page != 0);
+ BUG_ON(channel < MRF24J40_CHAN_MIN);
+ BUG_ON(channel > MRF24J40_CHAN_MAX);
+
+ /* Set Channel */
+ val = ((((__u8)channel)-11) << 4) | 0x03;
+ write_long_reg(devrec, REG_RFCON0, val);
+
+ /* RF Reset */
+ val = read_short_reg(devrec, REG_RFCTL);
+ val |= 0x04;
+ write_short_reg(devrec, REG_RFCTL, val);
+ val &= ~((__u8)0x04);
+ write_short_reg(devrec, REG_RFCTL, val);
+
+ udelay(192); /* per datasheet */
+
+ return 0;
+}
+
+static int mrf24j40_filter(struct ieee802154_dev *dev,
+ struct ieee802154_hw_addr_filt *filt,
+ unsigned long changed)
+{
+ struct mrf24j40 *devrec = dev->priv;
+
+ dev_dbg(printdev(devrec), "filter\n");
+
+ if (changed & IEEE802515_SADDR_CHANGED) {
+ /* Short Addr */
+ u8 addrh, addrl;
+ addrh = filt->short_addr >> 8 & 0xff;
+ addrl = filt->short_addr & 0xff;
+
+ write_short_reg(devrec, REG_SADRH, addrh);
+ write_short_reg(devrec, REG_SADRL, addrl);
+ dev_dbg(printdev(devrec), "Set short addr to %04hx\n",
filt->short_addr);
+ }
+
+ if (changed & IEEE802515_IEEEADDR_CHANGED) {
+ /* Device Address */
+ int i;
+ for (i = 0; i < 8; i++)
+ write_short_reg(devrec, REG_EADR0+i,
+ filt->ieee_addr[i]);
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "Set long addr to: ");
+ for (i = 0; i < 8; i++) {
+ printk("%02hhx ", filt->ieee_addr[i]);
+ }
+ printk(KERN_DEBUG "\n");
+#endif
+ }
+
+ if (changed & IEEE802515_PANID_CHANGED) {
+ /* PAN ID */
+ u8 panidl, panidh;
+ panidh = filt->pan_id >> 8 & 0xff;
+ panidl = filt->pan_id & 0xff;
+ write_short_reg(devrec, REG_PANIDH, panidh);
+ write_short_reg(devrec, REG_PANIDL, panidl);
+
+ dev_dbg(printdev(devrec), "Set PANID to %04hx\n", filt->pan_id);
+ }
+
+ if (changed & IEEE802515_PANC_CHANGED) {
+ /* Pan Coordinator */
+ u8 val;
+ val = read_short_reg(devrec, REG_RXMCR);
+ if (filt->pan_coord)
+ val |= 0x8;
+ else
+ val &= ~((u8)0x8);
+ write_short_reg(devrec, REG_RXMCR, val);
+
+ /* REG_SLOTTED is maintained as default (unslotted/CSMA-CA).
+ * REG_ORDER is maintained as default (no beacon/superframe).
+ */
+
+ dev_dbg(printdev(devrec), "Set Pan Coord to %s\n",
+ filt->pan_coord? "on": "off");
+ }
+
+ return 0;
+}
+
+static int mrf24j40_handle_rx(struct mrf24j40 *devrec)
+{
+ u8 len = 144; /* size of RX FIFO buffer */
+ u8 lqi = 0;
+ u8 val;
+ int ret = 0;
+ struct sk_buff *skb;
+
+ /* Turn off reception of packets off the air. This prevents the
+ * device from overwriting the buffer while we're reading it. */
+ val = read_short_reg(devrec, REG_BBREG1);
+ val |= 4; /* SET RXDECINV */
+ write_short_reg(devrec, REG_BBREG1, val);
+
+ skb = alloc_skb(len, GFP_KERNEL);
+ if (!skb) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = mrf24j40_read_rx_buf(devrec, skb_put(skb, len), &len, &lqi);
+ if (ret < 0) {
+ dev_err(printdev(devrec), "Failure reading RX FIFO\n");
+ kfree_skb(skb);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* Cut off the checksum */
+ skb_trim(skb, len-2);
+
+ ieee802154_rx_irqsafe(devrec->dev, skb, lqi);
+
+ dev_dbg(printdev(devrec), "RX Handled\n");
+
+out:
+ /* Turn back on reception of packets off the air. */
+ val = read_short_reg(devrec, REG_BBREG1);
+ val &= ~((u8)0x4); /* Clear RXDECINV */
+ write_short_reg(devrec, REG_BBREG1, val);
+
+ return ret;
+}
+
+static struct ieee802154_ops mrf24j40_ops = {
+ .owner = THIS_MODULE,
+ .xmit = mrf24j40_tx,
+ .ed = mrf24j40_ed,
+ .start = mrf24j40_start,
+ .stop = mrf24j40_stop,
+ .set_channel = mrf24j40_set_channel,
+ .set_hw_addr_filt = mrf24j40_filter,
+};
+
+static irqreturn_t mrf24j40_isr(int irq, void *data)
+{
+ struct mrf24j40 *devrec = data;
+
+ disable_irq_nosync(irq);
+
+ schedule_work(&devrec->irqwork);
+
+ return IRQ_HANDLED;
+}
+
+static void mrf24j40_isrwork(struct work_struct *work)
+{
+ struct mrf24j40 *devrec = container_of(work, struct mrf24j40, irqwork);
+ u8 intstat;
+
+ /* Check for TX complete */
+ intstat = read_short_reg(devrec, REG_INTSTAT);
+ if (intstat & 0x1)
+ complete(&devrec->tx_complete);
+
+ /* Check for Rx */
+ if (intstat & 0x8) {
+ mrf24j40_handle_rx(devrec);
+ }
+
+ intstat = read_short_reg(devrec, REG_INTSTAT);
+
+ enable_irq(devrec->spi->irq);
+}
+
+static int __devinit mrf24j40_probe(struct spi_device *spi)
+{
+ int ret = -ENOMEM;
+ int val;
+ struct mrf24j40 *devrec;
+
+ printk(KERN_INFO "mrf24j40: probe(). IRQ: %d\n", spi->irq);
+
+ devrec = kzalloc(sizeof(struct mrf24j40), GFP_KERNEL);
+ if (!devrec)
+ goto err_devrec;
+ devrec->buf = kzalloc(3, GFP_KERNEL);
+ if (!devrec->buf)
+ goto err_buf;
+
+ spi->mode = SPI_MODE_0; // TODO: Is this appropriate for right here?
+ spi->max_speed_hz = SPI_SPEED_HZ;
+
+
+ mutex_init(&devrec->mutex);
+ init_completion(&devrec->tx_complete);
+ INIT_WORK(&devrec->irqwork, mrf24j40_isrwork);
+ devrec->spi = spi;
+ dev_set_drvdata(&spi->dev, devrec);
+
+ /* Register with the 802154 subsystem */
+
+ // TODO: Shouldn't priv_size be set to zero in the call to
+ // ieee802154_alloc_device()? Other drivers do it this way, but
+ // mac802154/main.c seems to suggest zero is the right answer
+ // instead.
+ devrec->dev = ieee802154_alloc_device(sizeof(*devrec), &mrf24j40_ops);
+ if (!devrec->dev)
+ goto err_alloc_dev;
+
+ devrec->dev->priv = devrec;
+ devrec->dev->parent = &devrec->spi->dev;
+ devrec->dev->phy->channels_supported[0] = CHANNEL_MASK;
+ devrec->dev->flags = IEEE802154_HW_OMIT_CKSUM|IEEE802154_HW_AACK;
+
+ dev_dbg(printdev(devrec), "registered mrf24j40\n");
+ ret = ieee802154_register_device(devrec->dev);
+ if (ret)
+ goto err_register_device;
+
+ /* Initialize the device.
+ From datasheet section 3.2: Initialization. */
+ write_short_reg(devrec, REG_SOFTRST, 0x07);
+ write_short_reg(devrec, REG_PACON2, 0x98);
+ write_short_reg(devrec, REG_TXSTBL, 0x95);
+ write_long_reg(devrec, REG_RFCON0, 0x03);
+ write_long_reg(devrec, REG_RFCON1, 0x01);
+ write_long_reg(devrec, REG_RFCON2, 0x80);
+ write_long_reg(devrec, REG_RFCON6, 0x90);
+ write_long_reg(devrec, REG_RFCON7, 0x80);
+ write_long_reg(devrec, REG_RFCON8, 0x10);
+ write_long_reg(devrec, REG_SLPCON1, 0x21);
+ write_short_reg(devrec, REG_BBREG2, 0x80);
+ write_short_reg(devrec, REG_CCAEDTH, 0x60);
+ write_short_reg(devrec, REG_BBREG6, 0x40);
+ write_short_reg(devrec, REG_RFCTL, 0x04);
+ write_short_reg(devrec, REG_RFCTL, 0x0);
+ udelay(192);
+
+ /* Set RX Mode. RXMCR<1:0>: 0x0 normal, 0x1 promisc, 0x2 error */
+ val = read_short_reg(devrec, REG_RXMCR);
+ val &= ~((u8)0x3);
+ write_short_reg(devrec, REG_RXMCR, val);
+
+ ret = request_irq(spi->irq,
+ mrf24j40_isr,
+ IRQF_TRIGGER_FALLING,
+ dev_name(&spi->dev),
+ devrec);
+
+ if (ret) {
+ dev_err(printdev(devrec), "Unable to get IRQ");
+ goto err_irq;
+ }
+
+ return 0;
+
+err_irq:
+ ieee802154_unregister_device(devrec->dev);
+err_register_device:
+ ieee802154_free_device(devrec->dev);
+err_alloc_dev:
+ kfree(devrec->buf);
+err_buf:
+ kfree(devrec);
+err_devrec:
+ return ret;
+}
+
+static int __devexit mrf24j40_remove(struct spi_device *spi)
+{
+ struct mrf24j40 *devrec = dev_get_drvdata(&spi->dev);
+
+ dev_dbg(printdev(devrec), "remove\n");
+
+ free_irq(spi->irq, devrec);
+ flush_work_sync(&devrec->irqwork); /* TODO: Is this the right call? */
+ ieee802154_unregister_device(devrec->dev);
+ ieee802154_free_device(devrec->dev);
+ // TODO: Will ieee802154_free_device() wait until ->xmit() is
+ // complete?
+
+ /* Clean up the SPI stuff. */
+ dev_set_drvdata(&spi->dev, NULL);
+ kfree(devrec->buf);
+ kfree(devrec);
+ return 0;
+}
+
+static const struct spi_device_id mrf24j40_ids[] = {
+ { "mrf24j40", 0 },
+ { "mrf24j40ma", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(spi, mrf24j40_ids);
+
+static struct spi_driver mrf24j40_driver = {
+ .driver = {
+ .name = "mrf24j40",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .id_table = mrf24j40_ids,
+ .probe = mrf24j40_probe,
+ .remove = __devexit_p(mrf24j40_remove),
+};
+
+static int __init mrf24j40_init(void)
+{
+ return spi_register_driver(&mrf24j40_driver);
+}
+
+static void __exit mrf24j40_exit(void)
+{
+ spi_unregister_driver(&mrf24j40_driver);
+}
+
+module_init(mrf24j40_init);
+module_exit(mrf24j40_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alan Ott");
+MODULE_DESCRIPTION("MRF24J40 SPI 802.15.4 Controller Driver");
--
1.7.0.4
------------------------------------------------------------------------------
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