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linux-stable/drivers/net/ieee802154/mcr20a.c
Jakub Kicinski c5f50500a0 Stefan Schmidt says: 
====================
pull-request: ieee802154-next 2022-05-01

Miquel Raynal landed two patch series bundled in this pull request.

The first series re-works the symbol duration handling to better
accommodate the needs of the various phy layers in ieee802154.

In the second series Miquel improves th errors handling from drivers
up mac802154. THis streamlines the error handling throughout the
ieee/mac802154 stack in preparation for sync TX to be introduced for
MLME frames.
====================

Link: https://lore.kernel.org/r/20220501194614.1198325-1-stefan@datenfreihafen.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-05-02 13:57:56 -07:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for NXP MCR20A 802.15.4 Wireless-PAN Networking controller
*
* Copyright (C) 2018 Xue Liu <liuxuenetmail@gmail.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gpio/consumer.h>
#include <linux/spi/spi.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/skbuff.h>
#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include <linux/ieee802154.h>
#include <linux/debugfs.h>
#include <net/mac802154.h>
#include <net/cfg802154.h>
#include <linux/device.h>
#include "mcr20a.h"
#define SPI_COMMAND_BUFFER 3
#define REGISTER_READ BIT(7)
#define REGISTER_WRITE (0 << 7)
#define REGISTER_ACCESS (0 << 6)
#define PACKET_BUFF_BURST_ACCESS BIT(6)
#define PACKET_BUFF_BYTE_ACCESS BIT(5)
#define MCR20A_WRITE_REG(x) (x)
#define MCR20A_READ_REG(x) (REGISTER_READ | (x))
#define MCR20A_BURST_READ_PACKET_BUF (0xC0)
#define MCR20A_BURST_WRITE_PACKET_BUF (0x40)
#define MCR20A_CMD_REG 0x80
#define MCR20A_CMD_REG_MASK 0x3f
#define MCR20A_CMD_WRITE 0x40
#define MCR20A_CMD_FB 0x20
/* Number of Interrupt Request Status Register */
#define MCR20A_IRQSTS_NUM 2 /* only IRQ_STS1 and IRQ_STS2 */
/* MCR20A CCA Type */
enum {
MCR20A_CCA_ED, // energy detect - CCA bit not active,
// not to be used for T and CCCA sequences
MCR20A_CCA_MODE1, // energy detect - CCA bit ACTIVE
MCR20A_CCA_MODE2, // 802.15.4 compliant signal detect - CCA bit ACTIVE
MCR20A_CCA_MODE3
};
enum {
MCR20A_XCVSEQ_IDLE = 0x00,
MCR20A_XCVSEQ_RX = 0x01,
MCR20A_XCVSEQ_TX = 0x02,
MCR20A_XCVSEQ_CCA = 0x03,
MCR20A_XCVSEQ_TR = 0x04,
MCR20A_XCVSEQ_CCCA = 0x05,
};
/* IEEE-802.15.4 defined constants (2.4 GHz logical channels) */
#define MCR20A_MIN_CHANNEL (11)
#define MCR20A_MAX_CHANNEL (26)
#define MCR20A_CHANNEL_SPACING (5)
/* MCR20A CCA Threshold constans */
#define MCR20A_MIN_CCA_THRESHOLD (0x6EU)
#define MCR20A_MAX_CCA_THRESHOLD (0x00U)
/* version 0C */
#define MCR20A_OVERWRITE_VERSION (0x0C)
/* MCR20A PLL configurations */
static const u8 PLL_INT[16] = {
/* 2405 */ 0x0B, /* 2410 */ 0x0B, /* 2415 */ 0x0B,
/* 2420 */ 0x0B, /* 2425 */ 0x0B, /* 2430 */ 0x0B,
/* 2435 */ 0x0C, /* 2440 */ 0x0C, /* 2445 */ 0x0C,
/* 2450 */ 0x0C, /* 2455 */ 0x0C, /* 2460 */ 0x0C,
/* 2465 */ 0x0D, /* 2470 */ 0x0D, /* 2475 */ 0x0D,
/* 2480 */ 0x0D
};
static const u8 PLL_FRAC[16] = {
/* 2405 */ 0x28, /* 2410 */ 0x50, /* 2415 */ 0x78,
/* 2420 */ 0xA0, /* 2425 */ 0xC8, /* 2430 */ 0xF0,
/* 2435 */ 0x18, /* 2440 */ 0x40, /* 2445 */ 0x68,
/* 2450 */ 0x90, /* 2455 */ 0xB8, /* 2460 */ 0xE0,
/* 2465 */ 0x08, /* 2470 */ 0x30, /* 2475 */ 0x58,
/* 2480 */ 0x80
};
static const struct reg_sequence mar20a_iar_overwrites[] = {
{ IAR_MISC_PAD_CTRL, 0x02 },
{ IAR_VCO_CTRL1, 0xB3 },
{ IAR_VCO_CTRL2, 0x07 },
{ IAR_PA_TUNING, 0x71 },
{ IAR_CHF_IBUF, 0x2F },
{ IAR_CHF_QBUF, 0x2F },
{ IAR_CHF_IRIN, 0x24 },
{ IAR_CHF_QRIN, 0x24 },
{ IAR_CHF_IL, 0x24 },
{ IAR_CHF_QL, 0x24 },
{ IAR_CHF_CC1, 0x32 },
{ IAR_CHF_CCL, 0x1D },
{ IAR_CHF_CC2, 0x2D },
{ IAR_CHF_IROUT, 0x24 },
{ IAR_CHF_QROUT, 0x24 },
{ IAR_PA_CAL, 0x28 },
{ IAR_AGC_THR1, 0x55 },
{ IAR_AGC_THR2, 0x2D },
{ IAR_ATT_RSSI1, 0x5F },
{ IAR_ATT_RSSI2, 0x8F },
{ IAR_RSSI_OFFSET, 0x61 },
{ IAR_CHF_PMA_GAIN, 0x03 },
{ IAR_CCA1_THRESH, 0x50 },
{ IAR_CORR_NVAL, 0x13 },
{ IAR_ACKDELAY, 0x3D },
};
#define MCR20A_VALID_CHANNELS (0x07FFF800)
#define MCR20A_MAX_BUF (127)
#define printdev(X) (&X->spi->dev)
/* regmap information for Direct Access Register (DAR) access */
#define MCR20A_DAR_WRITE 0x01
#define MCR20A_DAR_READ 0x00
#define MCR20A_DAR_NUMREGS 0x3F
/* regmap information for Indirect Access Register (IAR) access */
#define MCR20A_IAR_ACCESS 0x80
#define MCR20A_IAR_NUMREGS 0xBEFF
/* Read/Write SPI Commands for DAR and IAR registers. */
#define MCR20A_READSHORT(reg) ((reg) << 1)
#define MCR20A_WRITESHORT(reg) ((reg) << 1 | 1)
#define MCR20A_READLONG(reg) (1 << 15 | (reg) << 5)
#define MCR20A_WRITELONG(reg) (1 << 15 | (reg) << 5 | 1 << 4)
/* Type definitions for link configuration of instantiable layers */
#define MCR20A_PHY_INDIRECT_QUEUE_SIZE (12)
static bool
mcr20a_dar_writeable(struct device *dev, unsigned int reg)
{
switch (reg) {
case DAR_IRQ_STS1:
case DAR_IRQ_STS2:
case DAR_IRQ_STS3:
case DAR_PHY_CTRL1:
case DAR_PHY_CTRL2:
case DAR_PHY_CTRL3:
case DAR_PHY_CTRL4:
case DAR_SRC_CTRL:
case DAR_SRC_ADDRS_SUM_LSB:
case DAR_SRC_ADDRS_SUM_MSB:
case DAR_T3CMP_LSB:
case DAR_T3CMP_MSB:
case DAR_T3CMP_USB:
case DAR_T2PRIMECMP_LSB:
case DAR_T2PRIMECMP_MSB:
case DAR_T1CMP_LSB:
case DAR_T1CMP_MSB:
case DAR_T1CMP_USB:
case DAR_T2CMP_LSB:
case DAR_T2CMP_MSB:
case DAR_T2CMP_USB:
case DAR_T4CMP_LSB:
case DAR_T4CMP_MSB:
case DAR_T4CMP_USB:
case DAR_PLL_INT0:
case DAR_PLL_FRAC0_LSB:
case DAR_PLL_FRAC0_MSB:
case DAR_PA_PWR:
/* no DAR_ACM */
case DAR_OVERWRITE_VER:
case DAR_CLK_OUT_CTRL:
case DAR_PWR_MODES:
return true;
default:
return false;
}
}
static bool
mcr20a_dar_readable(struct device *dev, unsigned int reg)
{
bool rc;
/* all writeable are also readable */
rc = mcr20a_dar_writeable(dev, reg);
if (rc)
return rc;
/* readonly regs */
switch (reg) {
case DAR_RX_FRM_LEN:
case DAR_CCA1_ED_FNL:
case DAR_EVENT_TMR_LSB:
case DAR_EVENT_TMR_MSB:
case DAR_EVENT_TMR_USB:
case DAR_TIMESTAMP_LSB:
case DAR_TIMESTAMP_MSB:
case DAR_TIMESTAMP_USB:
case DAR_SEQ_STATE:
case DAR_LQI_VALUE:
case DAR_RSSI_CCA_CONT:
return true;
default:
return false;
}
}
static bool
mcr20a_dar_volatile(struct device *dev, unsigned int reg)
{
/* can be changed during runtime */
switch (reg) {
case DAR_IRQ_STS1:
case DAR_IRQ_STS2:
case DAR_IRQ_STS3:
/* use them in spi_async and regmap so it's volatile */
return true;
default:
return false;
}
}
static bool
mcr20a_dar_precious(struct device *dev, unsigned int reg)
{
/* don't clear irq line on read */
switch (reg) {
case DAR_IRQ_STS1:
case DAR_IRQ_STS2:
case DAR_IRQ_STS3:
return true;
default:
return false;
}
}
static const struct regmap_config mcr20a_dar_regmap = {
.name = "mcr20a_dar",
.reg_bits = 8,
.val_bits = 8,
.write_flag_mask = REGISTER_ACCESS | REGISTER_WRITE,
.read_flag_mask = REGISTER_ACCESS | REGISTER_READ,
.cache_type = REGCACHE_RBTREE,
.writeable_reg = mcr20a_dar_writeable,
.readable_reg = mcr20a_dar_readable,
.volatile_reg = mcr20a_dar_volatile,
.precious_reg = mcr20a_dar_precious,
.fast_io = true,
.can_multi_write = true,
};
static bool
mcr20a_iar_writeable(struct device *dev, unsigned int reg)
{
switch (reg) {
case IAR_XTAL_TRIM:
case IAR_PMC_LP_TRIM:
case IAR_MACPANID0_LSB:
case IAR_MACPANID0_MSB:
case IAR_MACSHORTADDRS0_LSB:
case IAR_MACSHORTADDRS0_MSB:
case IAR_MACLONGADDRS0_0:
case IAR_MACLONGADDRS0_8:
case IAR_MACLONGADDRS0_16:
case IAR_MACLONGADDRS0_24:
case IAR_MACLONGADDRS0_32:
case IAR_MACLONGADDRS0_40:
case IAR_MACLONGADDRS0_48:
case IAR_MACLONGADDRS0_56:
case IAR_RX_FRAME_FILTER:
case IAR_PLL_INT1:
case IAR_PLL_FRAC1_LSB:
case IAR_PLL_FRAC1_MSB:
case IAR_MACPANID1_LSB:
case IAR_MACPANID1_MSB:
case IAR_MACSHORTADDRS1_LSB:
case IAR_MACSHORTADDRS1_MSB:
case IAR_MACLONGADDRS1_0:
case IAR_MACLONGADDRS1_8:
case IAR_MACLONGADDRS1_16:
case IAR_MACLONGADDRS1_24:
case IAR_MACLONGADDRS1_32:
case IAR_MACLONGADDRS1_40:
case IAR_MACLONGADDRS1_48:
case IAR_MACLONGADDRS1_56:
case IAR_DUAL_PAN_CTRL:
case IAR_DUAL_PAN_DWELL:
case IAR_CCA1_THRESH:
case IAR_CCA1_ED_OFFSET_COMP:
case IAR_LQI_OFFSET_COMP:
case IAR_CCA_CTRL:
case IAR_CCA2_CORR_PEAKS:
case IAR_CCA2_CORR_THRESH:
case IAR_TMR_PRESCALE:
case IAR_ANT_PAD_CTRL:
case IAR_MISC_PAD_CTRL:
case IAR_BSM_CTRL:
case IAR_RNG:
case IAR_RX_WTR_MARK:
case IAR_SOFT_RESET:
case IAR_TXDELAY:
case IAR_ACKDELAY:
case IAR_CORR_NVAL:
case IAR_ANT_AGC_CTRL:
case IAR_AGC_THR1:
case IAR_AGC_THR2:
case IAR_PA_CAL:
case IAR_ATT_RSSI1:
case IAR_ATT_RSSI2:
case IAR_RSSI_OFFSET:
case IAR_XTAL_CTRL:
case IAR_CHF_PMA_GAIN:
case IAR_CHF_IBUF:
case IAR_CHF_QBUF:
case IAR_CHF_IRIN:
case IAR_CHF_QRIN:
case IAR_CHF_IL:
case IAR_CHF_QL:
case IAR_CHF_CC1:
case IAR_CHF_CCL:
case IAR_CHF_CC2:
case IAR_CHF_IROUT:
case IAR_CHF_QROUT:
case IAR_PA_TUNING:
case IAR_VCO_CTRL1:
case IAR_VCO_CTRL2:
return true;
default:
return false;
}
}
static bool
mcr20a_iar_readable(struct device *dev, unsigned int reg)
{
bool rc;
/* all writeable are also readable */
rc = mcr20a_iar_writeable(dev, reg);
if (rc)
return rc;
/* readonly regs */
switch (reg) {
case IAR_PART_ID:
case IAR_DUAL_PAN_STS:
case IAR_RX_BYTE_COUNT:
case IAR_FILTERFAIL_CODE1:
case IAR_FILTERFAIL_CODE2:
case IAR_RSSI:
return true;
default:
return false;
}
}
static bool
mcr20a_iar_volatile(struct device *dev, unsigned int reg)
{
/* can be changed during runtime */
switch (reg) {
case IAR_DUAL_PAN_STS:
case IAR_RX_BYTE_COUNT:
case IAR_FILTERFAIL_CODE1:
case IAR_FILTERFAIL_CODE2:
case IAR_RSSI:
return true;
default:
return false;
}
}
static const struct regmap_config mcr20a_iar_regmap = {
.name = "mcr20a_iar",
.reg_bits = 16,
.val_bits = 8,
.write_flag_mask = REGISTER_ACCESS | REGISTER_WRITE | IAR_INDEX,
.read_flag_mask = REGISTER_ACCESS | REGISTER_READ | IAR_INDEX,
.cache_type = REGCACHE_RBTREE,
.writeable_reg = mcr20a_iar_writeable,
.readable_reg = mcr20a_iar_readable,
.volatile_reg = mcr20a_iar_volatile,
.fast_io = true,
};
struct mcr20a_local {
struct spi_device *spi;
struct ieee802154_hw *hw;
struct regmap *regmap_dar;
struct regmap *regmap_iar;
u8 *buf;
bool is_tx;
/* for writing tx buffer */
struct spi_message tx_buf_msg;
u8 tx_header[1];
/* burst buffer write command */
struct spi_transfer tx_xfer_header;
u8 tx_len[1];
/* len of tx packet */
struct spi_transfer tx_xfer_len;
/* data of tx packet */
struct spi_transfer tx_xfer_buf;
struct sk_buff *tx_skb;
/* for read length rxfifo */
struct spi_message reg_msg;
u8 reg_cmd[1];
u8 reg_data[MCR20A_IRQSTS_NUM];
struct spi_transfer reg_xfer_cmd;
struct spi_transfer reg_xfer_data;
/* receive handling */
struct spi_message rx_buf_msg;
u8 rx_header[1];
struct spi_transfer rx_xfer_header;
u8 rx_lqi[1];
struct spi_transfer rx_xfer_lqi;
u8 rx_buf[MCR20A_MAX_BUF];
struct spi_transfer rx_xfer_buf;
/* isr handling for reading intstat */
struct spi_message irq_msg;
u8 irq_header[1];
u8 irq_data[MCR20A_IRQSTS_NUM];
struct spi_transfer irq_xfer_data;
struct spi_transfer irq_xfer_header;
};
static void
mcr20a_write_tx_buf_complete(void *context)
{
struct mcr20a_local *lp = context;
int ret;
dev_dbg(printdev(lp), "%s\n", __func__);
lp->reg_msg.complete = NULL;
lp->reg_cmd[0] = MCR20A_WRITE_REG(DAR_PHY_CTRL1);
lp->reg_data[0] = MCR20A_XCVSEQ_TX;
lp->reg_xfer_data.len = 1;
ret = spi_async(lp->spi, &lp->reg_msg);
if (ret)
dev_err(printdev(lp), "failed to set SEQ TX\n");
}
static int
mcr20a_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
{
struct mcr20a_local *lp = hw->priv;
dev_dbg(printdev(lp), "%s\n", __func__);
lp->tx_skb = skb;
print_hex_dump_debug("mcr20a tx: ", DUMP_PREFIX_OFFSET, 16, 1,
skb->data, skb->len, 0);
lp->is_tx = 1;
lp->reg_msg.complete = NULL;
lp->reg_cmd[0] = MCR20A_WRITE_REG(DAR_PHY_CTRL1);
lp->reg_data[0] = MCR20A_XCVSEQ_IDLE;
lp->reg_xfer_data.len = 1;
return spi_async(lp->spi, &lp->reg_msg);
}
static int
mcr20a_ed(struct ieee802154_hw *hw, u8 *level)
{
WARN_ON(!level);
*level = 0xbe;
return 0;
}
static int
mcr20a_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
{
struct mcr20a_local *lp = hw->priv;
int ret;
dev_dbg(printdev(lp), "%s\n", __func__);
/* freqency = ((PLL_INT+64) + (PLL_FRAC/65536)) * 32 MHz */
ret = regmap_write(lp->regmap_dar, DAR_PLL_INT0, PLL_INT[channel - 11]);
if (ret)
return ret;
ret = regmap_write(lp->regmap_dar, DAR_PLL_FRAC0_LSB, 0x00);
if (ret)
return ret;
ret = regmap_write(lp->regmap_dar, DAR_PLL_FRAC0_MSB,
PLL_FRAC[channel - 11]);
if (ret)
return ret;
return 0;
}
static int
mcr20a_start(struct ieee802154_hw *hw)
{
struct mcr20a_local *lp = hw->priv;
int ret;
dev_dbg(printdev(lp), "%s\n", __func__);
/* No slotted operation */
dev_dbg(printdev(lp), "no slotted operation\n");
ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1,
DAR_PHY_CTRL1_SLOTTED, 0x0);
if (ret < 0)
return ret;
/* enable irq */
enable_irq(lp->spi->irq);
/* Unmask SEQ interrupt */
ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL2,
DAR_PHY_CTRL2_SEQMSK, 0x0);
if (ret < 0)
return ret;
/* Start the RX sequence */
dev_dbg(printdev(lp), "start the RX sequence\n");
ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1,
DAR_PHY_CTRL1_XCVSEQ_MASK, MCR20A_XCVSEQ_RX);
if (ret < 0)
return ret;
return 0;
}
static void
mcr20a_stop(struct ieee802154_hw *hw)
{
struct mcr20a_local *lp = hw->priv;
dev_dbg(printdev(lp), "%s\n", __func__);
/* stop all running sequence */
regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1,
DAR_PHY_CTRL1_XCVSEQ_MASK, MCR20A_XCVSEQ_IDLE);
/* disable irq */
disable_irq(lp->spi->irq);
}
static int
mcr20a_set_hw_addr_filt(struct ieee802154_hw *hw,
struct ieee802154_hw_addr_filt *filt,
unsigned long changed)
{
struct mcr20a_local *lp = hw->priv;
dev_dbg(printdev(lp), "%s\n", __func__);
if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
u16 addr = le16_to_cpu(filt->short_addr);
regmap_write(lp->regmap_iar, IAR_MACSHORTADDRS0_LSB, addr);
regmap_write(lp->regmap_iar, IAR_MACSHORTADDRS0_MSB, addr >> 8);
}
if (changed & IEEE802154_AFILT_PANID_CHANGED) {
u16 pan = le16_to_cpu(filt->pan_id);
regmap_write(lp->regmap_iar, IAR_MACPANID0_LSB, pan);
regmap_write(lp->regmap_iar, IAR_MACPANID0_MSB, pan >> 8);
}
if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
u8 addr[8], i;
memcpy(addr, &filt->ieee_addr, 8);
for (i = 0; i < 8; i++)
regmap_write(lp->regmap_iar,
IAR_MACLONGADDRS0_0 + i, addr[i]);
}
if (changed & IEEE802154_AFILT_PANC_CHANGED) {
if (filt->pan_coord) {
regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL4,
DAR_PHY_CTRL4_PANCORDNTR0, 0x10);
} else {
regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL4,
DAR_PHY_CTRL4_PANCORDNTR0, 0x00);
}
}
return 0;
}
/* -30 dBm to 10 dBm */
#define MCR20A_MAX_TX_POWERS 0x14
static const s32 mcr20a_powers[MCR20A_MAX_TX_POWERS + 1] = {
-3000, -2800, -2600, -2400, -2200, -2000, -1800, -1600, -1400,
-1200, -1000, -800, -600, -400, -200, 0, 200, 400, 600, 800, 1000
};
static int
mcr20a_set_txpower(struct ieee802154_hw *hw, s32 mbm)
{
struct mcr20a_local *lp = hw->priv;
u32 i;
dev_dbg(printdev(lp), "%s(%d)\n", __func__, mbm);
for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
if (lp->hw->phy->supported.tx_powers[i] == mbm)
return regmap_write(lp->regmap_dar, DAR_PA_PWR,
((i + 8) & 0x1F));
}
return -EINVAL;
}
#define MCR20A_MAX_ED_LEVELS MCR20A_MIN_CCA_THRESHOLD
static s32 mcr20a_ed_levels[MCR20A_MAX_ED_LEVELS + 1];
static int
mcr20a_set_cca_mode(struct ieee802154_hw *hw,
const struct wpan_phy_cca *cca)
{
struct mcr20a_local *lp = hw->priv;
unsigned int cca_mode = 0xff;
bool cca_mode_and = false;
int ret;
dev_dbg(printdev(lp), "%s\n", __func__);
/* mapping 802.15.4 to driver spec */
switch (cca->mode) {
case NL802154_CCA_ENERGY:
cca_mode = MCR20A_CCA_MODE1;
break;
case NL802154_CCA_CARRIER:
cca_mode = MCR20A_CCA_MODE2;
break;
case NL802154_CCA_ENERGY_CARRIER:
switch (cca->opt) {
case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
cca_mode = MCR20A_CCA_MODE3;
cca_mode_and = true;
break;
case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
cca_mode = MCR20A_CCA_MODE3;
cca_mode_and = false;
break;
default:
return -EINVAL;
}
break;
default:
return -EINVAL;
}
ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL4,
DAR_PHY_CTRL4_CCATYPE_MASK,
cca_mode << DAR_PHY_CTRL4_CCATYPE_SHIFT);
if (ret < 0)
return ret;
if (cca_mode == MCR20A_CCA_MODE3) {
if (cca_mode_and) {
ret = regmap_update_bits(lp->regmap_iar, IAR_CCA_CTRL,
IAR_CCA_CTRL_CCA3_AND_NOT_OR,
0x08);
} else {
ret = regmap_update_bits(lp->regmap_iar,
IAR_CCA_CTRL,
IAR_CCA_CTRL_CCA3_AND_NOT_OR,
0x00);
}
if (ret < 0)
return ret;
}
return ret;
}
static int
mcr20a_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
{
struct mcr20a_local *lp = hw->priv;
u32 i;
dev_dbg(printdev(lp), "%s\n", __func__);
for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
if (hw->phy->supported.cca_ed_levels[i] == mbm)
return regmap_write(lp->regmap_iar, IAR_CCA1_THRESH, i);
}
return 0;
}
static int
mcr20a_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
{
struct mcr20a_local *lp = hw->priv;
int ret;
u8 rx_frame_filter_reg = 0x0;
dev_dbg(printdev(lp), "%s(%d)\n", __func__, on);
if (on) {
/* All frame types accepted*/
rx_frame_filter_reg &= ~(IAR_RX_FRAME_FLT_FRM_VER);
rx_frame_filter_reg |= (IAR_RX_FRAME_FLT_ACK_FT |
IAR_RX_FRAME_FLT_NS_FT);
ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL4,
DAR_PHY_CTRL4_PROMISCUOUS,
DAR_PHY_CTRL4_PROMISCUOUS);
if (ret < 0)
return ret;
ret = regmap_write(lp->regmap_iar, IAR_RX_FRAME_FILTER,
rx_frame_filter_reg);
if (ret < 0)
return ret;
} else {
ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL4,
DAR_PHY_CTRL4_PROMISCUOUS, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(lp->regmap_iar, IAR_RX_FRAME_FILTER,
IAR_RX_FRAME_FLT_FRM_VER |
IAR_RX_FRAME_FLT_BEACON_FT |
IAR_RX_FRAME_FLT_DATA_FT |
IAR_RX_FRAME_FLT_CMD_FT);
if (ret < 0)
return ret;
}
return 0;
}
static const struct ieee802154_ops mcr20a_hw_ops = {
.owner = THIS_MODULE,
.xmit_async = mcr20a_xmit,
.ed = mcr20a_ed,
.set_channel = mcr20a_set_channel,
.start = mcr20a_start,
.stop = mcr20a_stop,
.set_hw_addr_filt = mcr20a_set_hw_addr_filt,
.set_txpower = mcr20a_set_txpower,
.set_cca_mode = mcr20a_set_cca_mode,
.set_cca_ed_level = mcr20a_set_cca_ed_level,
.set_promiscuous_mode = mcr20a_set_promiscuous_mode,
};
static int
mcr20a_request_rx(struct mcr20a_local *lp)
{
dev_dbg(printdev(lp), "%s\n", __func__);
/* Start the RX sequence */
regmap_update_bits_async(lp->regmap_dar, DAR_PHY_CTRL1,
DAR_PHY_CTRL1_XCVSEQ_MASK, MCR20A_XCVSEQ_RX);
return 0;
}
static void
mcr20a_handle_rx_read_buf_complete(void *context)
{
struct mcr20a_local *lp = context;
u8 len = lp->reg_data[0] & DAR_RX_FRAME_LENGTH_MASK;
struct sk_buff *skb;
dev_dbg(printdev(lp), "%s\n", __func__);
dev_dbg(printdev(lp), "RX is done\n");
if (!ieee802154_is_valid_psdu_len(len)) {
dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
len = IEEE802154_MTU;
}
len = len - 2; /* get rid of frame check field */
skb = dev_alloc_skb(len);
if (!skb)
return;
__skb_put_data(skb, lp->rx_buf, len);
ieee802154_rx_irqsafe(lp->hw, skb, lp->rx_lqi[0]);
print_hex_dump_debug("mcr20a rx: ", DUMP_PREFIX_OFFSET, 16, 1,
lp->rx_buf, len, 0);
pr_debug("mcr20a rx: lqi: %02hhx\n", lp->rx_lqi[0]);
/* start RX sequence */
mcr20a_request_rx(lp);
}
static void
mcr20a_handle_rx_read_len_complete(void *context)
{
struct mcr20a_local *lp = context;
u8 len;
int ret;
dev_dbg(printdev(lp), "%s\n", __func__);
/* get the length of received frame */
len = lp->reg_data[0] & DAR_RX_FRAME_LENGTH_MASK;
dev_dbg(printdev(lp), "frame len : %d\n", len);
/* prepare to read the rx buf */
lp->rx_buf_msg.complete = mcr20a_handle_rx_read_buf_complete;
lp->rx_header[0] = MCR20A_BURST_READ_PACKET_BUF;
lp->rx_xfer_buf.len = len;
ret = spi_async(lp->spi, &lp->rx_buf_msg);
if (ret)
dev_err(printdev(lp), "failed to read rx buffer length\n");
}
static int
mcr20a_handle_rx(struct mcr20a_local *lp)
{
dev_dbg(printdev(lp), "%s\n", __func__);
lp->reg_msg.complete = mcr20a_handle_rx_read_len_complete;
lp->reg_cmd[0] = MCR20A_READ_REG(DAR_RX_FRM_LEN);
lp->reg_xfer_data.len = 1;
return spi_async(lp->spi, &lp->reg_msg);
}
static int
mcr20a_handle_tx_complete(struct mcr20a_local *lp)
{
dev_dbg(printdev(lp), "%s\n", __func__);
ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
return mcr20a_request_rx(lp);
}
static int
mcr20a_handle_tx(struct mcr20a_local *lp)
{
int ret;
dev_dbg(printdev(lp), "%s\n", __func__);
/* write tx buffer */
lp->tx_header[0] = MCR20A_BURST_WRITE_PACKET_BUF;
/* add 2 bytes of FCS */
lp->tx_len[0] = lp->tx_skb->len + 2;
lp->tx_xfer_buf.tx_buf = lp->tx_skb->data;
/* add 1 byte psduLength */
lp->tx_xfer_buf.len = lp->tx_skb->len + 1;
ret = spi_async(lp->spi, &lp->tx_buf_msg);
if (ret) {
dev_err(printdev(lp), "SPI write Failed for TX buf\n");
return ret;
}
return 0;
}
static void
mcr20a_irq_clean_complete(void *context)
{
struct mcr20a_local *lp = context;
u8 seq_state = lp->irq_data[DAR_IRQ_STS1] & DAR_PHY_CTRL1_XCVSEQ_MASK;
dev_dbg(printdev(lp), "%s\n", __func__);
enable_irq(lp->spi->irq);
dev_dbg(printdev(lp), "IRQ STA1 (%02x) STA2 (%02x)\n",
lp->irq_data[DAR_IRQ_STS1], lp->irq_data[DAR_IRQ_STS2]);
switch (seq_state) {
/* TX IRQ, RX IRQ and SEQ IRQ */
case (DAR_IRQSTS1_TXIRQ | DAR_IRQSTS1_SEQIRQ):
if (lp->is_tx) {
lp->is_tx = 0;
dev_dbg(printdev(lp), "TX is done. No ACK\n");
mcr20a_handle_tx_complete(lp);
}
break;
case (DAR_IRQSTS1_RXIRQ | DAR_IRQSTS1_SEQIRQ):
/* rx is starting */
dev_dbg(printdev(lp), "RX is starting\n");
mcr20a_handle_rx(lp);
break;
case (DAR_IRQSTS1_RXIRQ | DAR_IRQSTS1_TXIRQ | DAR_IRQSTS1_SEQIRQ):
if (lp->is_tx) {
/* tx is done */
lp->is_tx = 0;
dev_dbg(printdev(lp), "TX is done. Get ACK\n");
mcr20a_handle_tx_complete(lp);
} else {
/* rx is starting */
dev_dbg(printdev(lp), "RX is starting\n");
mcr20a_handle_rx(lp);
}
break;
case (DAR_IRQSTS1_SEQIRQ):
if (lp->is_tx) {
dev_dbg(printdev(lp), "TX is starting\n");
mcr20a_handle_tx(lp);
} else {
dev_dbg(printdev(lp), "MCR20A is stop\n");
}
break;
}
}
static void mcr20a_irq_status_complete(void *context)
{
int ret;
struct mcr20a_local *lp = context;
dev_dbg(printdev(lp), "%s\n", __func__);
regmap_update_bits_async(lp->regmap_dar, DAR_PHY_CTRL1,
DAR_PHY_CTRL1_XCVSEQ_MASK, MCR20A_XCVSEQ_IDLE);
lp->reg_msg.complete = mcr20a_irq_clean_complete;
lp->reg_cmd[0] = MCR20A_WRITE_REG(DAR_IRQ_STS1);
memcpy(lp->reg_data, lp->irq_data, MCR20A_IRQSTS_NUM);
lp->reg_xfer_data.len = MCR20A_IRQSTS_NUM;
ret = spi_async(lp->spi, &lp->reg_msg);
if (ret)
dev_err(printdev(lp), "failed to clean irq status\n");
}
static irqreturn_t mcr20a_irq_isr(int irq, void *data)
{
struct mcr20a_local *lp = data;
int ret;
disable_irq_nosync(irq);
lp->irq_header[0] = MCR20A_READ_REG(DAR_IRQ_STS1);
/* read IRQSTSx */
ret = spi_async(lp->spi, &lp->irq_msg);
if (ret) {
enable_irq(irq);
return IRQ_NONE;
}
return IRQ_HANDLED;
}
static void mcr20a_hw_setup(struct mcr20a_local *lp)
{
u8 i;
struct ieee802154_hw *hw = lp->hw;
struct wpan_phy *phy = lp->hw->phy;
dev_dbg(printdev(lp), "%s\n", __func__);
hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
IEEE802154_HW_AFILT |
IEEE802154_HW_PROMISCUOUS;
phy->flags = WPAN_PHY_FLAG_TXPOWER | WPAN_PHY_FLAG_CCA_ED_LEVEL |
WPAN_PHY_FLAG_CCA_MODE;
phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
/* initiating cca_ed_levels */
for (i = MCR20A_MAX_CCA_THRESHOLD; i < MCR20A_MIN_CCA_THRESHOLD + 1;
++i) {
mcr20a_ed_levels[i] = -i * 100;
}
phy->supported.cca_ed_levels = mcr20a_ed_levels;
phy->supported.cca_ed_levels_size = ARRAY_SIZE(mcr20a_ed_levels);
phy->cca.mode = NL802154_CCA_ENERGY;
phy->supported.channels[0] = MCR20A_VALID_CHANNELS;
phy->current_page = 0;
/* MCR20A default reset value */
phy->current_channel = 20;
phy->supported.tx_powers = mcr20a_powers;
phy->supported.tx_powers_size = ARRAY_SIZE(mcr20a_powers);
phy->cca_ed_level = phy->supported.cca_ed_levels[75];
phy->transmit_power = phy->supported.tx_powers[0x0F];
}
static void
mcr20a_setup_tx_spi_messages(struct mcr20a_local *lp)
{
spi_message_init(&lp->tx_buf_msg);
lp->tx_buf_msg.context = lp;
lp->tx_buf_msg.complete = mcr20a_write_tx_buf_complete;
lp->tx_xfer_header.len = 1;
lp->tx_xfer_header.tx_buf = lp->tx_header;
lp->tx_xfer_len.len = 1;
lp->tx_xfer_len.tx_buf = lp->tx_len;
spi_message_add_tail(&lp->tx_xfer_header, &lp->tx_buf_msg);
spi_message_add_tail(&lp->tx_xfer_len, &lp->tx_buf_msg);
spi_message_add_tail(&lp->tx_xfer_buf, &lp->tx_buf_msg);
}
static void
mcr20a_setup_rx_spi_messages(struct mcr20a_local *lp)
{
spi_message_init(&lp->reg_msg);
lp->reg_msg.context = lp;
lp->reg_xfer_cmd.len = 1;
lp->reg_xfer_cmd.tx_buf = lp->reg_cmd;
lp->reg_xfer_cmd.rx_buf = lp->reg_cmd;
lp->reg_xfer_data.rx_buf = lp->reg_data;
lp->reg_xfer_data.tx_buf = lp->reg_data;
spi_message_add_tail(&lp->reg_xfer_cmd, &lp->reg_msg);
spi_message_add_tail(&lp->reg_xfer_data, &lp->reg_msg);
spi_message_init(&lp->rx_buf_msg);
lp->rx_buf_msg.context = lp;
lp->rx_buf_msg.complete = mcr20a_handle_rx_read_buf_complete;
lp->rx_xfer_header.len = 1;
lp->rx_xfer_header.tx_buf = lp->rx_header;
lp->rx_xfer_header.rx_buf = lp->rx_header;
lp->rx_xfer_buf.rx_buf = lp->rx_buf;
lp->rx_xfer_lqi.len = 1;
lp->rx_xfer_lqi.rx_buf = lp->rx_lqi;
spi_message_add_tail(&lp->rx_xfer_header, &lp->rx_buf_msg);
spi_message_add_tail(&lp->rx_xfer_buf, &lp->rx_buf_msg);
spi_message_add_tail(&lp->rx_xfer_lqi, &lp->rx_buf_msg);
}
static void
mcr20a_setup_irq_spi_messages(struct mcr20a_local *lp)
{
spi_message_init(&lp->irq_msg);
lp->irq_msg.context = lp;
lp->irq_msg.complete = mcr20a_irq_status_complete;
lp->irq_xfer_header.len = 1;
lp->irq_xfer_header.tx_buf = lp->irq_header;
lp->irq_xfer_header.rx_buf = lp->irq_header;
lp->irq_xfer_data.len = MCR20A_IRQSTS_NUM;
lp->irq_xfer_data.rx_buf = lp->irq_data;
spi_message_add_tail(&lp->irq_xfer_header, &lp->irq_msg);
spi_message_add_tail(&lp->irq_xfer_data, &lp->irq_msg);
}
static int
mcr20a_phy_init(struct mcr20a_local *lp)
{
u8 index;
unsigned int phy_reg = 0;
int ret;
dev_dbg(printdev(lp), "%s\n", __func__);
/* Disable Tristate on COCO MISO for SPI reads */
ret = regmap_write(lp->regmap_iar, IAR_MISC_PAD_CTRL, 0x02);
if (ret)
goto err_ret;
/* Clear all PP IRQ bits in IRQSTS1 to avoid unexpected interrupts
* immediately after init
*/
ret = regmap_write(lp->regmap_dar, DAR_IRQ_STS1, 0xEF);
if (ret)
goto err_ret;
/* Clear all PP IRQ bits in IRQSTS2 */
ret = regmap_write(lp->regmap_dar, DAR_IRQ_STS2,
DAR_IRQSTS2_ASM_IRQ | DAR_IRQSTS2_PB_ERR_IRQ |
DAR_IRQSTS2_WAKE_IRQ);
if (ret)
goto err_ret;
/* Disable all timer interrupts */
ret = regmap_write(lp->regmap_dar, DAR_IRQ_STS3, 0xFF);
if (ret)
goto err_ret;
/* PHY_CTRL1 : default HW settings + AUTOACK enabled */
ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1,
DAR_PHY_CTRL1_AUTOACK, DAR_PHY_CTRL1_AUTOACK);
/* PHY_CTRL2 : disable all interrupts */
ret = regmap_write(lp->regmap_dar, DAR_PHY_CTRL2, 0xFF);
if (ret)
goto err_ret;
/* PHY_CTRL3 : disable all timers and remaining interrupts */
ret = regmap_write(lp->regmap_dar, DAR_PHY_CTRL3,
DAR_PHY_CTRL3_ASM_MSK | DAR_PHY_CTRL3_PB_ERR_MSK |
DAR_PHY_CTRL3_WAKE_MSK);
if (ret)
goto err_ret;
/* SRC_CTRL : enable Acknowledge Frame Pending and
* Source Address Matching Enable
*/
ret = regmap_write(lp->regmap_dar, DAR_SRC_CTRL,
DAR_SRC_CTRL_ACK_FRM_PND |
(DAR_SRC_CTRL_INDEX << DAR_SRC_CTRL_INDEX_SHIFT));
if (ret)
goto err_ret;
/* RX_FRAME_FILTER */
/* FRM_VER[1:0] = b11. Accept FrameVersion 0 and 1 packets */
ret = regmap_write(lp->regmap_iar, IAR_RX_FRAME_FILTER,
IAR_RX_FRAME_FLT_FRM_VER |
IAR_RX_FRAME_FLT_BEACON_FT |
IAR_RX_FRAME_FLT_DATA_FT |
IAR_RX_FRAME_FLT_CMD_FT);
if (ret)
goto err_ret;
dev_info(printdev(lp), "MCR20A DAR overwrites version: 0x%02x\n",
MCR20A_OVERWRITE_VERSION);
/* Overwrites direct registers */
ret = regmap_write(lp->regmap_dar, DAR_OVERWRITE_VER,
MCR20A_OVERWRITE_VERSION);
if (ret)
goto err_ret;
/* Overwrites indirect registers */
ret = regmap_multi_reg_write(lp->regmap_iar, mar20a_iar_overwrites,
ARRAY_SIZE(mar20a_iar_overwrites));
if (ret)
goto err_ret;
/* Clear HW indirect queue */
dev_dbg(printdev(lp), "clear HW indirect queue\n");
for (index = 0; index < MCR20A_PHY_INDIRECT_QUEUE_SIZE; index++) {
phy_reg = (u8)(((index & DAR_SRC_CTRL_INDEX) <<
DAR_SRC_CTRL_INDEX_SHIFT)
| (DAR_SRC_CTRL_SRCADDR_EN)
| (DAR_SRC_CTRL_INDEX_DISABLE));
ret = regmap_write(lp->regmap_dar, DAR_SRC_CTRL, phy_reg);
if (ret)
goto err_ret;
phy_reg = 0;
}
/* Assign HW Indirect hash table to PAN0 */
ret = regmap_read(lp->regmap_iar, IAR_DUAL_PAN_CTRL, &phy_reg);
if (ret)
goto err_ret;
/* Clear current lvl */
phy_reg &= ~IAR_DUAL_PAN_CTRL_DUAL_PAN_SAM_LVL_MSK;
/* Set new lvl */
phy_reg |= MCR20A_PHY_INDIRECT_QUEUE_SIZE <<
IAR_DUAL_PAN_CTRL_DUAL_PAN_SAM_LVL_SHIFT;
ret = regmap_write(lp->regmap_iar, IAR_DUAL_PAN_CTRL, phy_reg);
if (ret)
goto err_ret;
/* Set CCA threshold to -75 dBm */
ret = regmap_write(lp->regmap_iar, IAR_CCA1_THRESH, 0x4B);
if (ret)
goto err_ret;
/* Set prescaller to obtain 1 symbol (16us) timebase */
ret = regmap_write(lp->regmap_iar, IAR_TMR_PRESCALE, 0x05);
if (ret)
goto err_ret;
/* Enable autodoze mode. */
ret = regmap_update_bits(lp->regmap_dar, DAR_PWR_MODES,
DAR_PWR_MODES_AUTODOZE,
DAR_PWR_MODES_AUTODOZE);
if (ret)
goto err_ret;
/* Disable clk_out */
ret = regmap_update_bits(lp->regmap_dar, DAR_CLK_OUT_CTRL,
DAR_CLK_OUT_CTRL_EN, 0x0);
if (ret)
goto err_ret;
return 0;
err_ret:
return ret;
}
static int
mcr20a_probe(struct spi_device *spi)
{
struct ieee802154_hw *hw;
struct mcr20a_local *lp;
struct gpio_desc *rst_b;
int irq_type;
int ret = -ENOMEM;
dev_dbg(&spi->dev, "%s\n", __func__);
if (!spi->irq) {
dev_err(&spi->dev, "no IRQ specified\n");
return -EINVAL;
}
rst_b = devm_gpiod_get(&spi->dev, "rst_b", GPIOD_OUT_HIGH);
if (IS_ERR(rst_b)) {
ret = PTR_ERR(rst_b);
if (ret != -EPROBE_DEFER)
dev_err(&spi->dev, "Failed to get 'rst_b' gpio: %d", ret);
return ret;
}
/* reset mcr20a */
usleep_range(10, 20);
gpiod_set_value_cansleep(rst_b, 1);
usleep_range(10, 20);
gpiod_set_value_cansleep(rst_b, 0);
usleep_range(120, 240);
/* allocate ieee802154_hw and private data */
hw = ieee802154_alloc_hw(sizeof(*lp), &mcr20a_hw_ops);
if (!hw) {
dev_crit(&spi->dev, "ieee802154_alloc_hw failed\n");
return ret;
}
/* init mcr20a local data */
lp = hw->priv;
lp->hw = hw;
lp->spi = spi;
/* init ieee802154_hw */
hw->parent = &spi->dev;
ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
/* init buf */
lp->buf = devm_kzalloc(&spi->dev, SPI_COMMAND_BUFFER, GFP_KERNEL);
if (!lp->buf) {
ret = -ENOMEM;
goto free_dev;
}
mcr20a_setup_tx_spi_messages(lp);
mcr20a_setup_rx_spi_messages(lp);
mcr20a_setup_irq_spi_messages(lp);
/* setup regmap */
lp->regmap_dar = devm_regmap_init_spi(spi, &mcr20a_dar_regmap);
if (IS_ERR(lp->regmap_dar)) {
ret = PTR_ERR(lp->regmap_dar);
dev_err(&spi->dev, "Failed to allocate dar map: %d\n",
ret);
goto free_dev;
}
lp->regmap_iar = devm_regmap_init_spi(spi, &mcr20a_iar_regmap);
if (IS_ERR(lp->regmap_iar)) {
ret = PTR_ERR(lp->regmap_iar);
dev_err(&spi->dev, "Failed to allocate iar map: %d\n", ret);
goto free_dev;
}
mcr20a_hw_setup(lp);
spi_set_drvdata(spi, lp);
ret = mcr20a_phy_init(lp);
if (ret < 0) {
dev_crit(&spi->dev, "mcr20a_phy_init failed\n");
goto free_dev;
}
irq_type = irq_get_trigger_type(spi->irq);
if (!irq_type)
irq_type = IRQF_TRIGGER_FALLING;
ret = devm_request_irq(&spi->dev, spi->irq, mcr20a_irq_isr,
irq_type, dev_name(&spi->dev), lp);
if (ret) {
dev_err(&spi->dev, "could not request_irq for mcr20a\n");
ret = -ENODEV;
goto free_dev;
}
/* disable_irq by default and wait for starting hardware */
disable_irq(spi->irq);
ret = ieee802154_register_hw(hw);
if (ret) {
dev_crit(&spi->dev, "ieee802154_register_hw failed\n");
goto free_dev;
}
return ret;
free_dev:
ieee802154_free_hw(lp->hw);
return ret;
}
static void mcr20a_remove(struct spi_device *spi)
{
struct mcr20a_local *lp = spi_get_drvdata(spi);
dev_dbg(&spi->dev, "%s\n", __func__);
ieee802154_unregister_hw(lp->hw);
ieee802154_free_hw(lp->hw);
}
static const struct of_device_id mcr20a_of_match[] = {
{ .compatible = "nxp,mcr20a", },
{ },
};
MODULE_DEVICE_TABLE(of, mcr20a_of_match);
static const struct spi_device_id mcr20a_device_id[] = {
{ .name = "mcr20a", },
{ },
};
MODULE_DEVICE_TABLE(spi, mcr20a_device_id);
static struct spi_driver mcr20a_driver = {
.id_table = mcr20a_device_id,
.driver = {
.of_match_table = of_match_ptr(mcr20a_of_match),
.name = "mcr20a",
},
.probe = mcr20a_probe,
.remove = mcr20a_remove,
};
module_spi_driver(mcr20a_driver);
MODULE_DESCRIPTION("MCR20A Transceiver Driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Xue Liu <liuxuenetmail@gmail>");
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