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cc2531.c
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cc2531.c
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// SPDX-FileCopyrightText: 2023 Andreas Sig Rosvall
//
// SPDX-License-Identifier: GPL-3.0-or-later
/*
* IEEE 802.15.4 driver for CC2531 dongle running WPAN Adapter firmware from
* https://github.com/rosvall/cc2531_usb_wpan_adapter/
*/
#include <linux/kernel.h>
#include <linux/atomic.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/usb.h>
#include <linux/skbuff.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
#include <linux/kref.h>
#include <net/cfg802154.h>
#include <net/mac802154.h>
#include "cc2531_regs.h"
#include "cc2531_csp.h"
MODULE_AUTHOR("Andreas Rosvall <andreas@rosvall.dk>");
MODULE_DESCRIPTION("CC2531-based IEEE 802.15.4 USB Network Adapter Driver");
MODULE_LICENSE("GPL");
#define CC2531_USB_VID 0x1608
#define CC2531_USB_PID 0x154f
static const struct usb_device_id cc2531_device_table[] = {
{ USB_DEVICE_AND_INTERFACE_INFO(CC2531_USB_VID,
CC2531_USB_PID,
USB_CLASS_VENDOR_SPEC,
USB_SUBCLASS_VENDOR_SPEC,
0xff) },
{},
};
MODULE_DEVICE_TABLE(usb, cc2531_device_table);
/*
* Custom control requests
*/
enum cc2531_usb_request {
CC2531_USB_REQ_XDATA_READ = 0,
CC2531_USB_REQ_XDATA_WRITE = 1,
CC2531_USB_REQ_FIFO_READ = 2,
CC2531_USB_REQ_FIFO_WRITE = 3,
CC2531_USB_REQ_TX = 4,
CC2531_USB_REQ_SET_CSMA = 5,
};
enum cc2531_usb_request_type {
USB_RT_VENDOR_IN = USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
USB_RT_VENDOR_OUT = USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
};
/*
* Special string descriptors
*/
enum cc2531_string_desc {
CC2531_STRING_DESC_VERSION = 0x80, /* Firmware version string */
};
/*
* HW Constants
*/
#define CC2531_CHAN_MIN 11
#define CC2531_CHAN_MAX 31
/*
* Ref.: http://www.ti.com/lit/pdf/SWRU191F p.264 CCACTRL1 (0x6197) - Other CCA Options
*/
enum cc2531_cca_mode {
CC2531_CCA_MODE_DISABLED = 0,
CC2531_CCA_MODE_RSSI = 1,
CC2531_CCA_MODE_RX = 2,
CC2531_CCA_MODE_RSSI_AND_RX = 3,
};
#define CC2531_RX_URB_COUNT 4
#define CC2531_INT_URB_COUNT 4
#define CC2531_RX_SIZE 128
struct cc2531 {
struct kref kref;
struct delayed_work resubmit_delayed;
struct work_struct tx_work;
struct usb_anchor idle_urbs, submitted;
struct completion status_received, got_ack;
struct ieee802154_hw *hw;
struct usb_interface *intf;
struct device *dev;
struct usb_device *usb;
struct sk_buff *tx_skb;
spinlock_t lock;
bool lbt;
unsigned frame_retries;
atomic_t tx_status, expected_ack_seq;
};
#define CC2531_FREQCTRL_TO_CHANNEL(_v) (11 + ((_v)-11) / 5)
#define CC2531_CHANNEL_TO_FREQCTRL(_ch) (11 + 5 * ((_ch)-11))
/*
* Ref.: http://www.ti.com/lit/pdf/SWRS086 Table 1. Recommended Output Power
* Settings. These values should have some offset added depending on board.
*/
static const s32 cc2531_powers[] = {
/* mBm TX_POWER reg */
-2200, /*0x05*/
-2000, /*0x15*/
-1800, /*0x25*/
-1600, /*0x35*/
-1400, /*0x45*/
-1200, /*0x55*/
-1000, /*0x65*/
-800, /*0x75*/
-600, /*0x85*/
-400, /*0x95*/
-300, /*0xA5*/
-150, /*0xB5*/
-50, /*0xC5*/
100, /*0xD5*/
250, /*0xE5*/
450, /*0xF5*/
};
/*
* Clear channel assessment energy levels in mBm.
* The chip will accept anything from -204dBm up to 51dBm.
* (-128-76dBm to 127-76dBm)
* The noise floor is around -95dBm though, so lower values make little sense.
*/
static const s32 cc2531_ed_levels[] = {
-10000, -9900, -9800, -9700, -9600, -9500, -9400, -9300, -9200,
-9100, -9000, -8900, -8800, -8700, -8600, -8500, -8400, -8300,
-8200, -8100, -8000, -7900, -7800, -7700, -7600, -7500, -7400,
-7300, -7200, -7100, -7000, -6900, -6800, -6700, -6600, -6500,
-6400, -6300, -6200, -6100, -6000, -5900, -5800, -5700, -5600,
-5500, -5400, -5300, -5200, -5100, -5000, -4900, -4800, -4700,
-4600, -4500, -4400, -4300, -4200, -4100, -4000,
};
#define CC2531_DBM_OFFSET -76
#define CC2531_MBM_TO_HWLVL(_mbm) ((_mbm) / 100 - CC2531_DBM_OFFSET)
#define CC2531_HWLVL_TO_MBM(_hw_rssi) \
(100 * ((s8)(_hw_rssi) + CC2531_DBM_OFFSET))
static void cc2531_set_hw_caps(struct ieee802154_hw *hw)
{
hw->flags = IEEE802154_HW_OMIT_CKSUM |
IEEE802154_HW_AFILT |
IEEE802154_HW_PROMISCUOUS |
IEEE802154_HW_FRAME_RETRIES |
IEEE802154_HW_CSMA_PARAMS;
hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
WPAN_PHY_FLAG_CCA_ED_LEVEL |
WPAN_PHY_FLAG_CCA_MODE;
hw->phy->symbol_duration = 16000;
hw->phy->supported = (struct wpan_phy_supported){
.iftypes = BIT(NL802154_IFTYPE_NODE) |
BIT(NL802154_IFTYPE_MONITOR) |
BIT(NL802154_IFTYPE_COORD),
.cca_modes = BIT(NL802154_CCA_ENERGY) |
BIT(NL802154_CCA_CARRIER) |
BIT(NL802154_CCA_ENERGY_CARRIER) |
BIT(NL802154_CCA_ALOHA),
.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND),
.min_frame_retries = 0,
.max_frame_retries = 32,
.min_minbe = 0,
.max_minbe = 7,
.min_maxbe = 0,
.max_maxbe = 7,
.min_csma_backoffs = 0,
.max_csma_backoffs = 32,
.lbt = NL802154_SUPPORTED_BOOL_TRUE,
.channels[0] = GENMASK(CC2531_CHAN_MAX, CC2531_CHAN_MIN),
.tx_powers = cc2531_powers,
.tx_powers_size = ARRAY_SIZE(cc2531_powers),
.cca_ed_levels = cc2531_ed_levels,
.cca_ed_levels_size = ARRAY_SIZE(cc2531_ed_levels),
};
}
static void cc2531_delete(struct kref *kref)
{
struct cc2531 *cc = container_of(kref, struct cc2531, kref);
struct urb *urb;
struct device *dev = cc->dev;
dev_dbg(dev, "%s", __func__);
while ((urb = usb_get_from_anchor(&cc->idle_urbs))) {
usb_free_coherent(cc->usb, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
usb_put_urb(urb);
dev_dbg(dev, "freed urb %p", urb);
}
usb_put_intf(cc->intf);
usb_put_dev(cc->usb);
ieee802154_free_hw(cc->hw);
dev_dbg(dev, "%s done", __func__);
}
static int cc2531_control_msg_recv(struct cc2531 *cc,
enum cc2531_usb_request req, u16 value,
u16 index, void *data, u16 size)
{
int err;
err = usb_autopm_get_interface(cc->intf);
if (err) {
dev_err(cc->dev, "usb_autopm_get_interface failed: %d", err);
return err;
}
err = usb_control_msg_recv(cc->usb, 0, req, USB_RT_VENDOR_IN, value,
index, data, size, USB_CTRL_GET_TIMEOUT,
GFP_KERNEL);
if (err)
dev_err(cc->dev, "usb_control_msg_recv error %d", err);
usb_autopm_put_interface(cc->intf);
return err;
}
static int cc2531_control_msg_send(struct cc2531 *cc,
enum cc2531_usb_request req, u16 value,
u16 index, const void *data, u16 size)
{
int err;
err = usb_autopm_get_interface(cc->intf);
if (err) {
dev_err(cc->dev, "usb_autopm_get_interface failed: %d", err);
return err;
}
err = usb_control_msg_send(cc->usb, 0, req, USB_RT_VENDOR_OUT, value,
index, data, size, USB_CTRL_GET_TIMEOUT,
GFP_KERNEL);
if (err)
dev_err(cc->dev, "usb_control_msg_send error %d", err);
usb_autopm_put_interface(cc->intf);
return err;
}
inline int cc2531_write(struct cc2531 *cc, enum cc2531_reg_addr addr,
const void *data, u16 size)
{
return cc2531_control_msg_send(cc, CC2531_USB_REQ_XDATA_WRITE, addr, 0,
data, size);
}
inline int cc2531_write_byte(struct cc2531 *cc, enum cc2531_reg_addr addr,
u8 byte)
{
return cc2531_write(cc, addr, &byte, 1);
}
inline int csp_imm_strobe(struct cc2531 *cc, enum csp_cmd_strobe strobe)
{
u8 imm_strobe = CSP_IMM_CMD_STROBE(strobe);
return cc2531_write_byte(cc, CC2531_REG_RFST_ADDR, imm_strobe);
}
inline int cc2531_read(struct cc2531 *cc, enum cc2531_reg_addr addr, void *data,
u16 size)
{
return cc2531_control_msg_recv(cc, CC2531_USB_REQ_XDATA_READ, addr, 0,
data, size);
}
inline int cc2531_read_byte(struct cc2531 *cc, enum cc2531_reg_addr addr,
u8 *byte)
{
return cc2531_read(cc, addr, byte, 1);
}
static int cc2531_write_reg_bits(struct cc2531 *cc, enum cc2531_reg_addr addr,
u8 msb, u8 lsb, u8 val)
{
int err;
u8 mask = GENMASK(msb, lsb);
u8 tmp;
val <<= lsb;
val &= mask;
err = cc2531_read_byte(cc, addr, &tmp);
if (err)
return err;
if ((tmp & mask) == val)
return 0;
tmp &= ~mask;
tmp |= val;
return cc2531_write_byte(cc, addr, tmp);
}
#define regbits_write(_dev, _name, _var) \
cc2531_write_reg_bits(_dev, CC2531_REG_ADDR(_name), \
CC2531_REG_MSB(_name), CC2531_REG_LSB(_name), \
_var)
static int cc2531_read_reg_bits(struct cc2531 *cc, unsigned int addr, u8 msb,
u8 lsb, u8 *val)
{
int err;
err = cc2531_read_byte(cc, addr, val);
*val &= GENMASK(msb, lsb);
*val >>= lsb;
return err;
}
#define regbits_read(_dev, _name, _var) \
cc2531_read_reg_bits(_dev, CC2531_REG_ADDR(_name), \
CC2531_REG_MSB(_name), CC2531_REG_LSB(_name), \
_var)
static int cc2531_send_pkt(struct cc2531 *cc, void *data, unsigned len)
{
u8 mode = 0;
dev_dbg(cc->dev, "sending pkt\n");
return cc2531_control_msg_send(cc, CC2531_USB_REQ_TX, mode, 0, data,
len);
}
static u8 cc2531_mfr_to_lqi(u8 *mfr)
{
const int corr_min = 60, corr_max = 110, rssi_min = -30, rssi_max = 60;
int lqi, corr, rssi, crc_ok;
/* RSSI comes as 8 bit signed int */
rssi = (int)(s8)mfr[0];
crc_ok = mfr[1] & 0x80;
corr = mfr[1] & 0x7f;
if (!crc_ok)
return 0;
corr = 255 * (corr - corr_min) / (corr_max - corr_min);
corr = clamp(corr, 0, 255);
rssi = 255 * (rssi - rssi_min) / (rssi_max - rssi_min);
rssi = clamp(rssi, 0, 255);
lqi = corr * 3 / 4 + rssi * 1 / 4;
return lqi;
}
static inline bool ieee802154_is_ack(__le16 fc)
{
return IEEE802154_FC_TYPE(fc) == cpu_to_le16(IEEE802154_FC_TYPE_ACK);
}
static void cc2531_pkt_received(struct cc2531 *cc, u8 *data, u32 len)
{
struct sk_buff *skb;
u8 msdu_len = len - IEEE802154_MFR_SIZE;
u8 *mac_footer = data + msdu_len;
u8 lqi;
__le16 fc;
dev_dbg(cc->dev, "pkt_received %p %u", data, len);
if (!ieee802154_is_valid_psdu_len(len)) {
dev_dbg(cc->dev, "Received pkt with invalid length: %u\n",
len);
goto drop_pkt;
}
lqi = cc2531_mfr_to_lqi(mac_footer);
if (!lqi) {
dev_dbg(cc->dev, "Received pkt with invalid crc\n");
goto drop_pkt;
}
fc = __get_unaligned_t(__le16, data);
if (ieee802154_is_ack(fc)) {
int seq = data[IEEE802154_FC_LEN];
int expected;
unsigned long flags;
spin_lock_irqsave(&cc->lock, flags);
expected = atomic_read(&cc->expected_ack_seq);
spin_unlock_irqrestore(&cc->lock, flags);
dev_dbg(cc->dev, "got an ack. seq: %u", seq);
if (seq == expected) {
dev_dbg(cc->dev, "it's the one we're waiting for!");
complete(&cc->got_ack);
}
}
skb = alloc_skb(msdu_len, GFP_ATOMIC);
if (!skb) {
dev_err(cc->dev, "Could not alloc skb for received packet\n");
goto drop_pkt;
}
skb_put_data(skb, data, msdu_len);
ieee802154_rx_irqsafe(cc->hw, skb, lqi);
return;
drop_pkt:
print_hex_dump_bytes("pkt: ", DUMP_PREFIX_NONE, data, len);
}
static void cc2531_int_received(struct cc2531 *cc, u8 status)
{
dev_dbg(cc->dev, "int status: %u", status);
if (completion_done(&cc->status_received)) {
WARN_ON(1);
return;
}
atomic_set(&cc->tx_status, status);
complete(&cc->status_received);
}
static int cc2531_transmit_once(struct cc2531 *cc, struct sk_buff *skb)
{
const unsigned long timeout = msecs_to_jiffies(5000);
int err;
int status;
WARN_ON(swq_has_sleeper(&cc->status_received.wait));
reinit_completion(&cc->status_received);
atomic_set(&cc->tx_status, -ETIMEDOUT);
err = cc2531_send_pkt(cc, skb->data, skb->len);
if (err) {
dev_err(cc->dev, "cc2531_send_pkt failed: %d", err);
return err;
}
// Wait for status_urb to get tx status
if (!wait_for_completion_timeout(&cc->status_received, timeout)) {
dev_err(cc->dev, "Timed out waiting for status urb");
}
status = atomic_read(&cc->tx_status);
if (!status)
dev_dbg(cc->dev, "transmitted ok");
return status;
}
static int cc2531_transmit_with_retries(struct cc2531 *cc, struct sk_buff *skb)
{
const unsigned long timeout = msecs_to_jiffies(20);
unsigned remaining_frame_retries = cc->frame_retries;
u8 seq = skb->data[IEEE802154_FC_LEN];
int status;
unsigned long flags;
dev_dbg(cc->dev, "sending with ackreq. seq: %u", seq);
spin_lock_irqsave(&cc->lock, flags);
atomic_set(&cc->expected_ack_seq, seq);
spin_unlock_irqrestore(&cc->lock, flags);
WARN_ON(swq_has_sleeper(&cc->got_ack.wait));
reinit_completion(&cc->got_ack);
do {
status = cc2531_transmit_once(cc, skb);
if (status < 0)
goto end;
if (status > 0) {
dev_dbg(cc->dev, "waiting for ack: got tx status: %d",
status);
continue;
}
if (wait_for_completion_timeout(&cc->got_ack, timeout)) {
dev_dbg(cc->dev, "Acked");
goto end;
} else {
dev_dbg(cc->dev, "Timed out waiting for ACK");
}
if (remaining_frame_retries)
dev_dbg(cc->dev, "retransmitting...");
} while (remaining_frame_retries--);
dev_dbg(cc->dev, "Unacked: seq no %u", seq);
if (!status)
status = IEEE802154_NO_ACK;
end:
spin_lock_irqsave(&cc->lock, flags);
atomic_set(&cc->expected_ack_seq, -1);
spin_unlock_irqrestore(&cc->lock, flags);
return status;
}
static void cc2531_do_tx_work(struct work_struct *work)
{
struct cc2531 *cc = container_of(work, struct cc2531, tx_work);
int tx_status = IEEE802154_SYSTEM_ERROR;
struct sk_buff *skb;
unsigned long flags;
__le16 fc;
spin_lock_irqsave(&cc->lock, flags);
skb = READ_ONCE(cc->tx_skb);
spin_unlock_irqrestore(&cc->lock, flags);
dev_dbg(cc->dev, "do_tx_work tx_skb: %p", skb);
WARN_ON(!skb);
if (!skb)
return;
fc = __get_unaligned_t(__le16, skb->data);
if (ieee802154_is_ackreq(fc)) {
tx_status = cc2531_transmit_with_retries(cc, skb);
} else {
tx_status = cc2531_transmit_once(cc, skb);
}
spin_lock_irqsave(&cc->lock, flags);
WRITE_ONCE(cc->tx_skb, NULL);
spin_unlock_irqrestore(&cc->lock, flags);
if (tx_status) {
dev_dbg(cc->dev, "bad tx_status: %d", tx_status);
ieee802154_xmit_error(cc->hw, skb, tx_status);
} else {
dev_dbg(cc->dev, "tx complete");
ieee802154_xmit_complete(cc->hw, skb, false);
}
}
static int cc2531_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
{
unsigned long flags;
struct cc2531 *cc = hw->priv;
dev_dbg(cc->dev, "xmit tx_skb: %p\n", skb);
spin_lock_irqsave(&cc->lock, flags);
WARN_ON(READ_ONCE(cc->tx_skb));
WRITE_ONCE(cc->tx_skb, skb);
spin_unlock_irqrestore(&cc->lock, flags);
schedule_work(&cc->tx_work);
return 0;
}
static int cc2531_ed(struct ieee802154_hw *hw, u8 *level)
{
struct cc2531 *cc = hw->priv;
WARN_ON(level == NULL);
dev_dbg(cc->dev, "%s\n", __func__);
return cc2531_read(cc, CC2531_REG_RSSI_ADDR, level, sizeof(*level));
}
static int cc2531_set_hw_addr_filt(struct ieee802154_hw *hw,
struct ieee802154_hw_addr_filt *filt,
unsigned long changed)
{
struct cc2531 *cc = hw->priv;
int err;
if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
dev_dbg(cc->dev, "hw filter: Address: %#06x\n",
le16_to_cpu(filt->short_addr));
err = cc2531_write(cc, CC2531_REG_SHORT_ADDR_ADDR,
&filt->short_addr, sizeof(filt->short_addr));
if (err)
return err;
}
if (changed & IEEE802154_AFILT_PANID_CHANGED) {
dev_dbg(cc->dev, "hw filter: PAN: %#06x\n",
le16_to_cpu(filt->pan_id));
err = cc2531_write(cc, CC2531_REG_PAN_ID_ADDR, &filt->pan_id,
sizeof(filt->pan_id));
if (err)
return err;
}
if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
dev_dbg(cc->dev, "hw filter: Extended address: %016llx\n",
le64_to_cpu(filt->ieee_addr));
err = cc2531_write(cc, CC2531_REG_EXT_ADD_ADDR,
&filt->ieee_addr, sizeof(filt->ieee_addr));
if (err)
return err;
}
if (changed & IEEE802154_AFILT_PANC_CHANGED) {
dev_dbg(cc->dev, "hw filter: Is PAN coordinator: %d\n",
filt->pan_coord);
err = regbits_write(cc, PAN_COORDINATOR, filt->pan_coord);
if (err)
return err;
}
return 0;
}
static int cc2531_set_txpower(struct ieee802154_hw *hw, s32 mbm)
{
struct cc2531 *cc = hw->priv;
for (int i = 0; i < ARRAY_SIZE(cc2531_powers); i++) {
if (cc2531_powers[i] == mbm) {
u8 reg_value = (i << 4) | 0x05;
dev_dbg(cc->dev, "setting tx power: %d mBm\n", mbm);
return cc2531_write_byte(cc, CC2531_REG_TXPOWER_ADDR,
reg_value);
}
}
return -EINVAL;
}
static int cc2531_set_cca_mode(struct ieee802154_hw *hw,
const struct wpan_phy_cca *cca)
{
struct cc2531 *cc = hw->priv;
u8 mode;
dev_dbg(cc->dev, "setting cca mode: %d\n", cca->mode);
/* mapping 802.15.4 to driver spec */
switch (cca->mode) {
case NL802154_CCA_ENERGY:
mode = CC2531_CCA_MODE_RSSI;
break;
case NL802154_CCA_CARRIER:
mode = CC2531_CCA_MODE_RX;
break;
case NL802154_CCA_ENERGY_CARRIER:
mode = CC2531_CCA_MODE_RSSI_AND_RX;
break;
case NL802154_CCA_ALOHA:
mode = CC2531_CCA_MODE_DISABLED;
break;
default:
return -EINVAL;
}
return regbits_write(cc, CCA_MODE, mode);
}
static int cc2531_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
{
struct cc2531 *cc = hw->priv;
s32 value;
u8 reg_value;
value = CC2531_MBM_TO_HWLVL(mbm);
if (value < S8_MIN || value > S8_MAX)
return -EINVAL;
dev_dbg(cc->dev, "setting cca energy: %d mBm\n", mbm);
reg_value = (u8)value;
return regbits_write(cc, CCA_THR, reg_value);
}
static int cc2531_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
{
struct cc2531 *cc = hw->priv;
u8 reg_value;
if (page != 0)
return -EINVAL;
dev_dbg(cc->dev, "setting ch: %d\n", channel);
reg_value = CC2531_CHANNEL_TO_FREQCTRL(channel);
return cc2531_write_byte(cc, CC2531_REG_FREQCTRL_ADDR, reg_value);
}
static int cc2531_set_lbt(struct ieee802154_hw *hw, bool on)
{
struct cc2531 *cc = hw->priv;
dev_dbg(cc->dev, "setting lbt %s\n", on ? "on" : "off");
cc->lbt = on;
return 0;
}
static int cc2531_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
{
struct cc2531 *cc = hw->priv;
dev_dbg(cc->dev, "promiscous mode: %d\n", on);
return regbits_write(cc, FRAME_FILTER_EN, !on);
}
static int cc2531_set_frame_retries(struct ieee802154_hw *hw, const s8 retries)
{
struct cc2531 *cc = hw->priv;
if (retries < 0)
return -EINVAL;
dev_dbg(cc->dev, "setting frame retries: %u\n", retries);
cc->frame_retries = (u8)retries;
return 0;
}
static int cc2531_set_csma_params(struct ieee802154_hw *hw, u8 min_be,
u8 max_be, u8 retries)
{
struct cc2531 *cc = hw->priv;
u16 packed_csma_settings = (retries << 8) | (max_be << 4) | min_be;
dev_dbg(cc->dev, "CSMA params: min_be: %u max_be: %u be_retries: %u",
min_be, max_be, retries);
return cc2531_control_msg_send(cc, CC2531_USB_REQ_SET_CSMA,
packed_csma_settings, 0, NULL, 0);
}
static int cc2531_start(struct ieee802154_hw *hw)
{
struct cc2531 *cc = hw->priv;
int err;
err = usb_autopm_get_interface(cc->intf);
if (err)
return err;
kref_get(&cc->kref);
dev_dbg(cc->dev, "START\n");
schedule_delayed_work(&cc->resubmit_delayed, 0);
return csp_imm_strobe(cc, CSP_CMD_RXON);
}
static void cc2531_stop(struct ieee802154_hw *hw)
{
struct cc2531 *cc = hw->priv;
dev_dbg(cc->dev, "STOP\n");
csp_imm_strobe(cc, CSP_CMD_RFOFF);
usb_kill_anchored_urbs(&cc->submitted);
kref_put(&cc->kref, cc2531_delete);
usb_autopm_put_interface(cc->intf);
}
static const struct ieee802154_ops cc2531_ieee802154_ops = {
.owner = THIS_MODULE,
.xmit_async = cc2531_xmit,
.ed = cc2531_ed,
.set_channel = cc2531_set_channel,
.start = cc2531_start,
.stop = cc2531_stop,
.set_hw_addr_filt = cc2531_set_hw_addr_filt,
.set_txpower = cc2531_set_txpower,
.set_lbt = cc2531_set_lbt,
.set_cca_mode = cc2531_set_cca_mode,
.set_cca_ed_level = cc2531_set_cca_ed_level,
.set_promiscuous_mode = cc2531_set_promiscuous_mode,
.set_frame_retries = cc2531_set_frame_retries,
.set_csma_params = cc2531_set_csma_params,
};
static int cc2531_read_perm_extaddr(struct cc2531 *cc)
{
int err;
__le64 *addr = &cc->hw->phy->perm_extended_addr;
err = cc2531_read(cc, CC2531_REG_IEEE_PERM_ADDR_ADDR, addr,
sizeof(*addr));
if (err)
return err;
dev_info(cc->dev, "read permanent extended address: %016llx",
le64_to_cpu(*addr));
return err;
}
static int cc2531_read_version_str(struct cc2531 *cc)
{
char version_str[256] = { 0 };
int len = usb_string(cc->usb, CC2531_STRING_DESC_VERSION, version_str,
sizeof(version_str));
if (len < 0)
return len;
dev_info(cc->dev, "CC2531 firmware version: %s", version_str);
return 0;
}
static int cc2531_configure_chip(struct cc2531 *cc)
{
struct ieee802154_hw *hw = cc->hw;
struct wpan_phy *phy = hw->phy;
u8 regval;
int err;
// Read regs
err = cc2531_read_perm_extaddr(cc);
if (err)
return err;
err = cc2531_read_version_str(cc);
if (err)
return err;
err = cc2531_read_byte(cc, CC2531_REG_FREQCTRL_ADDR, ®val);
if (err)
return err;
phy->current_page = 0;
phy->current_channel = CC2531_FREQCTRL_TO_CHANNEL(regval);
dev_dbg(cc->dev, "current channel: %d\n", phy->current_channel);
err = cc2531_read_byte(cc, CC2531_REG_TXPOWER_ADDR, ®val);
if (err)
return err;
phy->transmit_power = phy->supported.tx_powers[regval >> 4];
dev_dbg(cc->dev, "current TX power: %d mBm\n", phy->transmit_power);
err = regbits_read(cc, CCA_THR, ®val);
if (err)
return err;
phy->cca_ed_level = CC2531_HWLVL_TO_MBM(regval);
dev_dbg(cc->dev, "current CCA energy: %d mBm\n", phy->cca_ed_level);
err = regbits_read(cc, CCA_MODE, ®val);
if (err)
return err;
switch (regval) {
case CC2531_CCA_MODE_RSSI:
hw->phy->cca.mode = NL802154_CCA_ENERGY;
break;
case CC2531_CCA_MODE_RX:
hw->phy->cca.mode = NL802154_CCA_CARRIER;
break;
case CC2531_CCA_MODE_RSSI_AND_RX:
hw->phy->cca.mode = NL802154_CCA_ENERGY_CARRIER;
break;
case CC2531_CCA_MODE_DISABLED:
hw->phy->cca.mode = NL802154_CCA_ALOHA;
break;
}
dev_dbg(cc->dev, "current CCA mode: %d\n", phy->cca.mode);
return 0;
}
static int cc2531_resubmit_urb(struct cc2531 *cc, struct urb *urb, gfp_t flags)
{
const unsigned long resubmit_delay = msecs_to_jiffies(1000);
int err = usb_submit_urb(urb, flags);
// dev_dbg(cc->dev, "%s %p", __func__, urb);
if (err) {
dev_err(cc->dev, "resubmit failed: %d\n", err);
usb_anchor_urb(urb, &cc->idle_urbs);
usb_put_urb(urb);
schedule_delayed_work(&cc->resubmit_delayed, resubmit_delay);
} else {
usb_anchor_urb(urb, &cc->submitted);
}
return err;
}
static void cc2531_resubmit_idle_urbs(struct work_struct *work)
{
struct delayed_work *dw = to_delayed_work(work);
struct cc2531 *cc = container_of(dw, struct cc2531, resubmit_delayed);
struct urb *urb;
dev_dbg(cc->dev, "resubmitting later...");
while ((urb = usb_get_from_anchor(&cc->idle_urbs))) {
int err = cc2531_resubmit_urb(cc, urb, GFP_KERNEL);
if (err)
return;
}
}
static void cc2531_urb_done(struct urb *urb)
{
struct cc2531 *cc = urb->context;
switch (urb->status) {
case 0:
switch (usb_endpoint_type(&urb->ep->desc)) {
case USB_ENDPOINT_XFER_BULK:
cc2531_pkt_received(cc, urb->transfer_buffer,
urb->actual_length);
break;
case USB_ENDPOINT_XFER_INT:
cc2531_int_received(cc, *(u8 *)urb->transfer_buffer);
break;
}
break;
case -EPIPE:
dev_err(cc->dev, "Pipe broken for endpoint: %x\n", urb->ep->desc.bEndpointAddress);
fallthrough;
case -ENOENT:
case -ECONNRESET:
case -ESHUTDOWN:
dev_dbg(cc->dev, "urb dead: %d", urb->status);
usb_anchor_urb(urb, &cc->idle_urbs);
usb_put_urb(urb);
return;
default:
dev_err(cc->dev, "urb status = %d\n", urb->status);
}
cc2531_resubmit_urb(cc, urb, GFP_ATOMIC);
}
static int cc2531_create_idle_in_urb(struct cc2531 *cc,
struct usb_endpoint_descriptor *ep,
unsigned bufsize)
{
unsigned pipe;
struct urb *urb;
void *buf;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
return -ENOMEM;
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
buf = usb_alloc_coherent(cc->usb, bufsize, GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
usb_free_urb(urb);
return -ENOMEM;
}
switch (usb_endpoint_type(ep)) {
case USB_ENDPOINT_XFER_BULK:
pipe = usb_rcvbulkpipe(cc->usb, ep->bEndpointAddress);