/*
 * Analog Devices ADF7242 Low-Power IEEE 802.15.4 Transceiver
 *
 * Copyright 2009-2017 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 *
 * http://www.analog.com/ADF7242
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/firmware.h>
#include <linux/spi/spi.h>
#include <linux/skbuff.h>
#include <linux/of.h>
#include <linux/irq.h>
#include <linux/debugfs.h>
#include <linux/bitops.h>
#include <linux/ieee802154.h>
#include <net/mac802154.h>
#include <net/cfg802154.h>

#define FIRMWARE "adf7242_firmware.bin"
#define MAX_POLL_LOOPS 200

/* All Registers */

#define REG_EXT_CTRL    0x100   /* RW External LNA/PA and internal PA control */
#define REG_TX_FSK_TEST 0x101   /* RW TX FSK test mode configuration */
#define REG_CCA1        0x105   /* RW RSSI threshold for CCA */
#define REG_CCA2        0x106   /* RW CCA mode configuration */
#define REG_BUFFERCFG   0x107   /* RW RX_BUFFER overwrite control */
#define REG_PKT_CFG     0x108   /* RW FCS evaluation configuration */
#define REG_DELAYCFG0   0x109   /* RW RC_RX command to SFD or sync word delay */
#define REG_DELAYCFG1   0x10A   /* RW RC_TX command to TX state */
#define REG_DELAYCFG2   0x10B   /* RW Mac delay extension */
#define REG_SYNC_WORD0  0x10C   /* RW sync word bits [7:0] of [23:0]  */
#define REG_SYNC_WORD1  0x10D   /* RW sync word bits [15:8] of [23:0]  */
#define REG_SYNC_WORD2  0x10E   /* RW sync word bits [23:16] of [23:0]  */
#define REG_SYNC_CONFIG 0x10F   /* RW sync word configuration */
#define REG_RC_CFG      0x13E   /* RW RX / TX packet configuration */
#define REG_RC_VAR44    0x13F   /* RW RESERVED */
#define REG_CH_FREQ0    0x300   /* RW Channel Frequency Settings - Low */
#define REG_CH_FREQ1    0x301   /* RW Channel Frequency Settings - Middle */
#define REG_CH_FREQ2    0x302   /* RW Channel Frequency Settings - High */
#define REG_TX_FD       0x304   /* RW TX Frequency Deviation Register */
#define REG_DM_CFG0     0x305   /* RW RX Discriminator BW Register */
#define REG_TX_M        0x306   /* RW TX Mode Register */
#define REG_RX_M        0x307   /* RW RX Mode Register */
#define REG_RRB         0x30C   /* R RSSI Readback Register */
#define REG_LRB         0x30D   /* R Link Quality Readback Register */
#define REG_DR0         0x30E   /* RW bits [15:8] of [15:0] data rate setting */
#define REG_DR1         0x30F   /* RW bits [7:0] of [15:0] data rate setting */
#define REG_PRAMPG      0x313   /* RW RESERVED */
#define REG_TXPB        0x314   /* RW TX Packet Storage Base Address */
#define REG_RXPB        0x315   /* RW RX Packet Storage Base Address */
#define REG_TMR_CFG0    0x316   /* RW Wake up Timer Conf Register - High */
#define REG_TMR_CFG1    0x317   /* RW Wake up Timer Conf Register - Low */
#define REG_TMR_RLD0    0x318   /* RW Wake up Timer Value Register - High */
#define REG_TMR_RLD1    0x319   /* RW Wake up Timer Value Register - Low  */
#define REG_TMR_CTRL    0x31A   /* RW Wake up Timer Timeout flag */
#define REG_PD_AUX      0x31E   /* RW Battmon enable */
#define REG_GP_CFG      0x32C   /* RW GPIO Configuration */
#define REG_GP_OUT      0x32D   /* RW GPIO Configuration */
#define REG_GP_IN       0x32E   /* R GPIO Configuration */
#define REG_SYNT        0x335   /* RW bandwidth calibration timers */
#define REG_CAL_CFG     0x33D   /* RW Calibration Settings */
#define REG_PA_BIAS     0x36E   /* RW PA BIAS */
#define REG_SYNT_CAL    0x371   /* RW Oscillator and Doubler Configuration */
#define REG_IIRF_CFG    0x389   /* RW BB Filter Decimation Rate */
#define REG_CDR_CFG     0x38A   /* RW CDR kVCO */
#define REG_DM_CFG1     0x38B   /* RW Postdemodulator Filter */
#define REG_AGCSTAT     0x38E   /* R RXBB Ref Osc Calibration Engine Readback */
#define REG_RXCAL0      0x395   /* RW RX BB filter tuning, LSB */
#define REG_RXCAL1      0x396   /* RW RX BB filter tuning, MSB */
#define REG_RXFE_CFG    0x39B   /* RW RXBB Ref Osc & RXFE Calibration */
#define REG_PA_RR       0x3A7   /* RW Set PA ramp rate */
#define REG_PA_CFG      0x3A8   /* RW PA enable */
#define REG_EXTPA_CFG   0x3A9   /* RW External PA BIAS DAC */
#define REG_EXTPA_MSC   0x3AA   /* RW PA Bias Mode */
#define REG_ADC_RBK     0x3AE   /* R Readback temp */
#define REG_AGC_CFG1    0x3B2   /* RW GC Parameters */
#define REG_AGC_MAX     0x3B4   /* RW Slew rate  */
#define REG_AGC_CFG2    0x3B6   /* RW RSSI Parameters */
#define REG_AGC_CFG3    0x3B7   /* RW RSSI Parameters */
#define REG_AGC_CFG4    0x3B8   /* RW RSSI Parameters */
#define REG_AGC_CFG5    0x3B9   /* RW RSSI & NDEC Parameters */
#define REG_AGC_CFG6    0x3BA   /* RW NDEC Parameters */
#define REG_OCL_CFG1    0x3C4   /* RW OCL System Parameters */
#define REG_IRQ1_EN0    0x3C7   /* RW Interrupt Mask set bits for IRQ1 */
#define REG_IRQ1_EN1    0x3C8   /* RW Interrupt Mask set bits for IRQ1 */
#define REG_IRQ2_EN0    0x3C9   /* RW Interrupt Mask set bits for IRQ2 */
#define REG_IRQ2_EN1    0x3CA   /* RW Interrupt Mask set bits for IRQ2 */
#define REG_IRQ1_SRC0   0x3CB   /* RW Interrupt Source bits for IRQ */
#define REG_IRQ1_SRC1   0x3CC   /* RW Interrupt Source bits for IRQ */
#define REG_OCL_BW0     0x3D2   /* RW OCL System Parameters */
#define REG_OCL_BW1     0x3D3   /* RW OCL System Parameters */
#define REG_OCL_BW2     0x3D4   /* RW OCL System Parameters */
#define REG_OCL_BW3     0x3D5   /* RW OCL System Parameters */
#define REG_OCL_BW4     0x3D6   /* RW OCL System Parameters */
#define REG_OCL_BWS     0x3D7   /* RW OCL System Parameters */
#define REG_OCL_CFG13   0x3E0   /* RW OCL System Parameters */
#define REG_GP_DRV      0x3E3   /* RW I/O pads Configuration and bg trim */
#define REG_BM_CFG      0x3E6   /* RW Batt. Monitor Threshold Voltage setting */
#define REG_SFD_15_4    0x3F4   /* RW Option to set non standard SFD */
#define REG_AFC_CFG     0x3F7   /* RW AFC mode and polarity */
#define REG_AFC_KI_KP   0x3F8   /* RW AFC ki and kp */
#define REG_AFC_RANGE   0x3F9   /* RW AFC range */
#define REG_AFC_READ    0x3FA   /* RW Readback frequency error */

/* REG_EXTPA_MSC */
#define PA_PWR(x)               (((x) & 0xF) << 4)
#define EXTPA_BIAS_SRC          BIT(3)
#define EXTPA_BIAS_MODE(x)      (((x) & 0x7) << 0)

/* REG_PA_CFG */
#define PA_BRIDGE_DBIAS(x)      (((x) & 0x1F) << 0)
#define PA_DBIAS_HIGH_POWER     21
#define PA_DBIAS_LOW_POWER      13

/* REG_PA_BIAS */
#define PA_BIAS_CTRL(x)         (((x) & 0x1F) << 1)
#define REG_PA_BIAS_DFL         BIT(0)
#define PA_BIAS_HIGH_POWER      63
#define PA_BIAS_LOW_POWER       55

#define REG_PAN_ID0             0x112
#define REG_PAN_ID1             0x113
#define REG_SHORT_ADDR_0        0x114
#define REG_SHORT_ADDR_1        0x115
#define REG_IEEE_ADDR_0         0x116
#define REG_IEEE_ADDR_1         0x117
#define REG_IEEE_ADDR_2         0x118
#define REG_IEEE_ADDR_3         0x119
#define REG_IEEE_ADDR_4         0x11A
#define REG_IEEE_ADDR_5         0x11B
#define REG_IEEE_ADDR_6         0x11C
#define REG_IEEE_ADDR_7         0x11D
#define REG_FFILT_CFG           0x11E
#define REG_AUTO_CFG            0x11F
#define REG_AUTO_TX1            0x120
#define REG_AUTO_TX2            0x121
#define REG_AUTO_STATUS         0x122

/* REG_FFILT_CFG */
#define ACCEPT_BEACON_FRAMES   BIT(0)
#define ACCEPT_DATA_FRAMES     BIT(1)
#define ACCEPT_ACK_FRAMES      BIT(2)
#define ACCEPT_MACCMD_FRAMES   BIT(3)
#define ACCEPT_RESERVED_FRAMES BIT(4)
#define ACCEPT_ALL_ADDRESS     BIT(5)

/* REG_AUTO_CFG */
#define AUTO_ACK_FRAMEPEND     BIT(0)
#define IS_PANCOORD            BIT(1)
#define RX_AUTO_ACK_EN         BIT(3)
#define CSMA_CA_RX_TURNAROUND  BIT(4)

/* REG_AUTO_TX1 */
#define MAX_FRAME_RETRIES(x)   ((x) & 0xF)
#define MAX_CCA_RETRIES(x)     (((x) & 0x7) << 4)

/* REG_AUTO_TX2 */
#define CSMA_MAX_BE(x)         ((x) & 0xF)
#define CSMA_MIN_BE(x)         (((x) & 0xF) << 4)

#define CMD_SPI_NOP             0xFF /* No operation. Use for dummy writes */
#define CMD_SPI_PKT_WR          0x10 /* Write telegram to the Packet RAM
                                      * starting from the TX packet base address
                                      * pointer tx_packet_base
                                      */
#define CMD_SPI_PKT_RD          0x30 /* Read telegram from the Packet RAM
                                      * starting from RX packet base address
                                      * pointer rxpb.rx_packet_base
                                      */
#define CMD_SPI_MEM_WR(x)       (0x18 + (x >> 8)) /* Write data to MCR or
                                                   * Packet RAM sequentially
                                                   */
#define CMD_SPI_MEM_RD(x)       (0x38 + (x >> 8)) /* Read data from MCR or
                                                   * Packet RAM sequentially
                                                   */
#define CMD_SPI_MEMR_WR(x)      (0x08 + (x >> 8)) /* Write data to MCR or Packet
                                                   * RAM as random block
                                                   */
#define CMD_SPI_MEMR_RD(x)      (0x28 + (x >> 8)) /* Read data from MCR or
                                                   * Packet RAM random block
                                                   */
#define CMD_SPI_PRAM_WR         0x1E /* Write data sequentially to current
                                      * PRAM page selected
                                      */
#define CMD_SPI_PRAM_RD         0x3E /* Read data sequentially from current
                                      * PRAM page selected
                                      */
#define CMD_RC_SLEEP            0xB1 /* Invoke transition of radio controller
                                      * into SLEEP state
                                      */
#define CMD_RC_IDLE             0xB2 /* Invoke transition of radio controller
                                      * into IDLE state
                                      */
#define CMD_RC_PHY_RDY          0xB3 /* Invoke transition of radio controller
                                      * into PHY_RDY state
                                      */
#define CMD_RC_RX               0xB4 /* Invoke transition of radio controller
                                      * into RX state
                                      */
#define CMD_RC_TX               0xB5 /* Invoke transition of radio controller
                                      * into TX state
                                      */
#define CMD_RC_MEAS             0xB6 /* Invoke transition of radio controller
                                      * into MEAS state
                                      */
#define CMD_RC_CCA              0xB7 /* Invoke Clear channel assessment */
#define CMD_RC_CSMACA           0xC1 /* initiates CSMA-CA channel access
                                      * sequence and frame transmission
                                      */
#define CMD_RC_PC_RESET         0xC7 /* Program counter reset */
#define CMD_RC_RESET            0xC8 /* Resets the ADF7242 and puts it in
                                      * the sleep state
                                      */
#define CMD_RC_PC_RESET_NO_WAIT (CMD_RC_PC_RESET | BIT(31))

/* STATUS */

#define STAT_SPI_READY          BIT(7)
#define STAT_IRQ_STATUS         BIT(6)
#define STAT_RC_READY           BIT(5)
#define STAT_CCA_RESULT         BIT(4)
#define RC_STATUS_IDLE          1
#define RC_STATUS_MEAS          2
#define RC_STATUS_PHY_RDY       3
#define RC_STATUS_RX            4
#define RC_STATUS_TX            5
#define RC_STATUS_MASK          0xF

/* AUTO_STATUS */

#define SUCCESS                 0
#define SUCCESS_DATPEND         1
#define FAILURE_CSMACA          2
#define FAILURE_NOACK           3
#define AUTO_STATUS_MASK        0x3

#define PRAM_PAGESIZE           256

/* IRQ1 */

#define IRQ_CCA_COMPLETE        BIT(0)
#define IRQ_SFD_RX              BIT(1)
#define IRQ_SFD_TX              BIT(2)
#define IRQ_RX_PKT_RCVD         BIT(3)
#define IRQ_TX_PKT_SENT         BIT(4)
#define IRQ_FRAME_VALID         BIT(5)
#define IRQ_ADDRESS_VALID       BIT(6)
#define IRQ_CSMA_CA             BIT(7)

#define AUTO_TX_TURNAROUND      BIT(3)
#define ADDON_EN                BIT(4)

#define FLAG_XMIT               0
#define FLAG_START              1

#define ADF7242_REPORT_CSMA_CA_STAT 0 /* framework doesn't handle yet */

struct adf7242_local {
        struct spi_device *spi;
        struct completion tx_complete;
        struct ieee802154_hw *hw;
        struct mutex bmux; /* protect SPI messages */
        struct spi_message stat_msg;
        struct spi_transfer stat_xfer;
        struct dentry *debugfs_root;
        struct delayed_work work;
        struct workqueue_struct *wqueue;
        unsigned long flags;
        int tx_stat;
        bool promiscuous;
        s8 rssi;
        u8 max_frame_retries;
        u8 max_cca_retries;
        u8 max_be;
        u8 min_be;

        /* DMA (thus cache coherency maintenance) requires the
         * transfer buffers to live in their own cache lines.
         */

        u8 buf[3] ____cacheline_aligned;
        u8 buf_reg_tx[3];
        u8 buf_read_tx[4];
        u8 buf_read_rx[4];
        u8 buf_stat_rx;
        u8 buf_stat_tx;
        u8 buf_cmd;
};

static int adf7242_soft_reset(struct adf7242_local *lp, int line);

static int adf7242_status(struct adf7242_local *lp, u8 *stat)
{
        int status;

        mutex_lock(&lp->bmux);
        status = spi_sync(lp->spi, &lp->stat_msg);
        *stat = lp->buf_stat_rx;
        mutex_unlock(&lp->bmux);

        return status;
}

static int adf7242_wait_status(struct adf7242_local *lp, unsigned int status,
                               unsigned int mask, int line)
{
        int cnt = 0, ret = 0;
        u8 stat;

        do {
                adf7242_status(lp, &stat);
                cnt++;
        } while (((stat & mask) != status) && (cnt < MAX_POLL_LOOPS));

        if (cnt >= MAX_POLL_LOOPS) {
                ret = -ETIMEDOUT;

                if (!(stat & STAT_RC_READY)) {
                        adf7242_soft_reset(lp, line);
                        adf7242_status(lp, &stat);

                        if ((stat & mask) == status)
                                ret = 0;
                }

                if (ret < 0)
                        dev_warn(&lp->spi->dev,
                                 "%s:line %d Timeout status 0x%x (%d)\n",
                                 __func__, line, stat, cnt);
        }

        dev_vdbg(&lp->spi->dev, "%s : loops=%d line %d\n", __func__, cnt, line);

        return ret;
}

static int adf7242_wait_rc_ready(struct adf7242_local *lp, int line)
{
        return adf7242_wait_status(lp, STAT_RC_READY | STAT_SPI_READY,
                                   STAT_RC_READY | STAT_SPI_READY, line);
}

static int adf7242_wait_spi_ready(struct adf7242_local *lp, int line)
{
        return adf7242_wait_status(lp, STAT_SPI_READY,
                                   STAT_SPI_READY, line);
}

static int adf7242_write_fbuf(struct adf7242_local *lp, u8 *data, u8 len)
{
        u8 *buf = lp->buf;
        int status;
        struct spi_message msg;
        struct spi_transfer xfer_head = {
                .len = 2,
                .tx_buf = buf,

        };
        struct spi_transfer xfer_buf = {
                .len = len,
                .tx_buf = data,
        };

        spi_message_init(&msg);
        spi_message_add_tail(&xfer_head, &msg);
        spi_message_add_tail(&xfer_buf, &msg);

        adf7242_wait_spi_ready(lp, __LINE__);

        mutex_lock(&lp->bmux);
        buf[0] = CMD_SPI_PKT_WR;
        buf[1] = len + 2;

        status = spi_sync(lp->spi, &msg);
        mutex_unlock(&lp->bmux);

        return status;
}

static int adf7242_read_fbuf(struct adf7242_local *lp,
                             u8 *data, size_t len, bool packet_read)
{
        u8 *buf = lp->buf;
        int status;
        struct spi_message msg;
        struct spi_transfer xfer_head = {
                .len = 3,
                .tx_buf = buf,
                .rx_buf = buf,
        };
        struct spi_transfer xfer_buf = {
                .len = len,
                .rx_buf = data,
        };

        spi_message_init(&msg);
        spi_message_add_tail(&xfer_head, &msg);
        spi_message_add_tail(&xfer_buf, &msg);

        adf7242_wait_spi_ready(lp, __LINE__);

        mutex_lock(&lp->bmux);
        if (packet_read) {
                buf[0] = CMD_SPI_PKT_RD;
                buf[1] = CMD_SPI_NOP;
                buf[2] = 0;     /* PHR */
        } else {
                buf[0] = CMD_SPI_PRAM_RD;
                buf[1] = 0;
                buf[2] = CMD_SPI_NOP;
        }

        status = spi_sync(lp->spi, &msg);

        mutex_unlock(&lp->bmux);

        return status;
}

static int adf7242_read_reg(struct adf7242_local *lp, u16 addr, u8 *data)
{
        int status;
        struct spi_message msg;

        struct spi_transfer xfer = {
                .len = 4,
                .tx_buf = lp->buf_read_tx,
                .rx_buf = lp->buf_read_rx,
        };

        adf7242_wait_spi_ready(lp, __LINE__);

        mutex_lock(&lp->bmux);
        lp->buf_read_tx[0] = CMD_SPI_MEM_RD(addr);
        lp->buf_read_tx[1] = addr;
        lp->buf_read_tx[2] = CMD_SPI_NOP;
        lp->buf_read_tx[3] = CMD_SPI_NOP;

        spi_message_init(&msg);
        spi_message_add_tail(&xfer, &msg);

        status = spi_sync(lp->spi, &msg);
        if (msg.status)
                status = msg.status;

        if (!status)
                *data = lp->buf_read_rx[3];

        mutex_unlock(&lp->bmux);

        dev_vdbg(&lp->spi->dev, "%s : REG 0x%X, VAL 0x%X\n", __func__,
                 addr, *data);

        return status;
}

static int adf7242_write_reg(struct adf7242_local *lp, u16 addr, u8 data)
{
        int status;

        adf7242_wait_spi_ready(lp, __LINE__);

        mutex_lock(&lp->bmux);
        lp->buf_reg_tx[0] = CMD_SPI_MEM_WR(addr);
        lp->buf_reg_tx[1] = addr;
        lp->buf_reg_tx[2] = data;
        status = spi_write(lp->spi, lp->buf_reg_tx, 3);
        mutex_unlock(&lp->bmux);

        dev_vdbg(&lp->spi->dev, "%s : REG 0x%X, VAL 0x%X\n",
                 __func__, addr, data);

        return status;
}

static int adf7242_cmd(struct adf7242_local *lp, unsigned int cmd)
{
        int status;

        dev_vdbg(&lp->spi->dev, "%s : CMD=0x%X\n", __func__, cmd);

        if (cmd != CMD_RC_PC_RESET_NO_WAIT)
                adf7242_wait_rc_ready(lp, __LINE__);

        mutex_lock(&lp->bmux);
        lp->buf_cmd = cmd;
        status = spi_write(lp->spi, &lp->buf_cmd, 1);
        mutex_unlock(&lp->bmux);

        return status;
}

static int adf7242_upload_firmware(struct adf7242_local *lp, u8 *data, u16 len)
{
        struct spi_message msg;
        struct spi_transfer xfer_buf = { };
        int status, i, page = 0;
        u8 *buf = lp->buf;

        struct spi_transfer xfer_head = {
                .len = 2,
                .tx_buf = buf,
        };

        buf[0] = CMD_SPI_PRAM_WR;
        buf[1] = 0;

        spi_message_init(&msg);
        spi_message_add_tail(&xfer_head, &msg);
        spi_message_add_tail(&xfer_buf, &msg);

        for (i = len; i >= 0; i -= PRAM_PAGESIZE) {
                adf7242_write_reg(lp, REG_PRAMPG, page);

                xfer_buf.len = (i >= PRAM_PAGESIZE) ? PRAM_PAGESIZE : i;
                xfer_buf.tx_buf = &data[page * PRAM_PAGESIZE];

                mutex_lock(&lp->bmux);
                status = spi_sync(lp->spi, &msg);
                mutex_unlock(&lp->bmux);
                page++;
        }

        return status;
}

static int adf7242_verify_firmware(struct adf7242_local *lp,
                                   const u8 *data, size_t len)
{
#ifdef DEBUG
        int i, j;
        unsigned int page;
        u8 *buf = kmalloc(PRAM_PAGESIZE, GFP_KERNEL);

        if (!buf)
                return -ENOMEM;

        for (page = 0, i = len; i >= 0; i -= PRAM_PAGESIZE, page++) {
                size_t nb = (i >= PRAM_PAGESIZE) ? PRAM_PAGESIZE : i;

                adf7242_write_reg(lp, REG_PRAMPG, page);
                adf7242_read_fbuf(lp, buf, nb, false);

                for (j = 0; j < nb; j++) {
                        if (buf[j] != data[page * PRAM_PAGESIZE + j]) {
                                kfree(buf);
                                return -EIO;
                        }
                }
        }
        kfree(buf);
#endif
        return 0;
}

static void adf7242_clear_irqstat(struct adf7242_local *lp)
{
        adf7242_write_reg(lp, REG_IRQ1_SRC1, IRQ_CCA_COMPLETE | IRQ_SFD_RX |
                          IRQ_SFD_TX | IRQ_RX_PKT_RCVD | IRQ_TX_PKT_SENT |
                          IRQ_FRAME_VALID | IRQ_ADDRESS_VALID | IRQ_CSMA_CA);
}

static int adf7242_cmd_rx(struct adf7242_local *lp)
{
        /* Wait until the ACK is sent */
        adf7242_wait_status(lp, RC_STATUS_PHY_RDY, RC_STATUS_MASK, __LINE__);
        adf7242_clear_irqstat(lp);
        mod_delayed_work(lp->wqueue, &lp->work, msecs_to_jiffies(400));

        return adf7242_cmd(lp, CMD_RC_RX);
}

static void adf7242_rx_cal_work(struct work_struct *work)
{
        struct adf7242_local *lp =
        container_of(work, struct adf7242_local, work.work);

        /* Reissuing RC_RX every 400ms - to adjust for offset
         * drift in receiver (datasheet page 61, OCL section)
         */

        if (!test_bit(FLAG_XMIT, &lp->flags)) {
                adf7242_cmd(lp, CMD_RC_PHY_RDY);
                adf7242_cmd_rx(lp);
        }
}

static int adf7242_set_txpower(struct ieee802154_hw *hw, int mbm)
{
        struct adf7242_local *lp = hw->priv;
        u8 pwr, bias_ctrl, dbias, tmp;
        int db = mbm / 100;

        dev_vdbg(&lp->spi->dev, "%s : Power %d dB\n", __func__, db);

        if (db > 5 || db < -26)
                return -EINVAL;

        db = DIV_ROUND_CLOSEST(db + 29, 2);

        if (db > 15) {
                dbias = PA_DBIAS_HIGH_POWER;
                bias_ctrl = PA_BIAS_HIGH_POWER;
        } else {
                dbias = PA_DBIAS_LOW_POWER;
                bias_ctrl = PA_BIAS_LOW_POWER;
        }

        pwr = clamp_t(u8, db, 3, 15);

        adf7242_read_reg(lp, REG_PA_CFG, &tmp);
        tmp &= ~PA_BRIDGE_DBIAS(~0);
        tmp |= PA_BRIDGE_DBIAS(dbias);
        adf7242_write_reg(lp, REG_PA_CFG, tmp);

        adf7242_read_reg(lp, REG_PA_BIAS, &tmp);
        tmp &= ~PA_BIAS_CTRL(~0);
        tmp |= PA_BIAS_CTRL(bias_ctrl);
        adf7242_write_reg(lp, REG_PA_BIAS, tmp);

        adf7242_read_reg(lp, REG_EXTPA_MSC, &tmp);
        tmp &= ~PA_PWR(~0);
        tmp |= PA_PWR(pwr);

        return adf7242_write_reg(lp, REG_EXTPA_MSC, tmp);
}

static int adf7242_set_csma_params(struct ieee802154_hw *hw, u8 min_be,
                                   u8 max_be, u8 retries)
{
        struct adf7242_local *lp = hw->priv;
        int ret;

        dev_vdbg(&lp->spi->dev, "%s : min_be=%d max_be=%d retries=%d\n",
                 __func__, min_be, max_be, retries);

        if (min_be > max_be || max_be > 8 || retries > 5)
                return -EINVAL;

        ret = adf7242_write_reg(lp, REG_AUTO_TX1,
                                MAX_FRAME_RETRIES(lp->max_frame_retries) |
                                MAX_CCA_RETRIES(retries));
        if (ret)
                return ret;

        lp->max_cca_retries = retries;
        lp->max_be = max_be;
        lp->min_be = min_be;

        return adf7242_write_reg(lp, REG_AUTO_TX2, CSMA_MAX_BE(max_be) |
                        CSMA_MIN_BE(min_be));
}

static int adf7242_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
{
        struct adf7242_local *lp = hw->priv;
        int ret = 0;

        dev_vdbg(&lp->spi->dev, "%s : Retries = %d\n", __func__, retries);

        if (retries < -1 || retries > 15)
                return -EINVAL;

        if (retries >= 0)
                ret = adf7242_write_reg(lp, REG_AUTO_TX1,
                                        MAX_FRAME_RETRIES(retries) |
                                        MAX_CCA_RETRIES(lp->max_cca_retries));

        lp->max_frame_retries = retries;

        return ret;
}

static int adf7242_ed(struct ieee802154_hw *hw, u8 *level)
{
        struct adf7242_local *lp = hw->priv;

        *level = lp->rssi;

        dev_vdbg(&lp->spi->dev, "%s :Exit level=%d\n",
                 __func__, *level);

        return 0;
}

static int adf7242_start(struct ieee802154_hw *hw)
{
        struct adf7242_local *lp = hw->priv;

        adf7242_cmd(lp, CMD_RC_PHY_RDY);
        adf7242_clear_irqstat(lp);
        enable_irq(lp->spi->irq);
        set_bit(FLAG_START, &lp->flags);

        return adf7242_cmd_rx(lp);
}

static void adf7242_stop(struct ieee802154_hw *hw)
{
        struct adf7242_local *lp = hw->priv;

        disable_irq(lp->spi->irq);
        cancel_delayed_work_sync(&lp->work);
        adf7242_cmd(lp, CMD_RC_IDLE);
        clear_bit(FLAG_START, &lp->flags);
        adf7242_clear_irqstat(lp);
}

static int adf7242_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
{
        struct adf7242_local *lp = hw->priv;
        unsigned long freq;

        dev_dbg(&lp->spi->dev, "%s :Channel=%d\n", __func__, channel);

        might_sleep();

        WARN_ON(page != 0);
        WARN_ON(channel < 11);
        WARN_ON(channel > 26);

        freq = (2405 + 5 * (channel - 11)) * 100;
        adf7242_cmd(lp, CMD_RC_PHY_RDY);

        adf7242_write_reg(lp, REG_CH_FREQ0, freq);
        adf7242_write_reg(lp, REG_CH_FREQ1, freq >> 8);
        adf7242_write_reg(lp, REG_CH_FREQ2, freq >> 16);

        if (test_bit(FLAG_START, &lp->flags))
                return adf7242_cmd_rx(lp);
        else
                return adf7242_cmd(lp, CMD_RC_PHY_RDY);
}

static int adf7242_set_hw_addr_filt(struct ieee802154_hw *hw,
                                    struct ieee802154_hw_addr_filt *filt,
                                    unsigned long changed)
{
        struct adf7242_local *lp = hw->priv;
        u8 reg;

        dev_dbg(&lp->spi->dev, "%s :Changed=0x%lX\n", __func__, changed);

        might_sleep();

        if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
                u8 addr[8], i;

                memcpy(addr, &filt->ieee_addr, 8);

                for (i = 0; i < 8; i++)
                        adf7242_write_reg(lp, REG_IEEE_ADDR_0 + i, addr[i]);
        }

        if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
                u16 saddr = le16_to_cpu(filt->short_addr);

                adf7242_write_reg(lp, REG_SHORT_ADDR_0, saddr);
                adf7242_write_reg(lp, REG_SHORT_ADDR_1, saddr >> 8);
        }

        if (changed & IEEE802154_AFILT_PANID_CHANGED) {
                u16 pan_id = le16_to_cpu(filt->pan_id);

                adf7242_write_reg(lp, REG_PAN_ID0, pan_id);
                adf7242_write_reg(lp, REG_PAN_ID1, pan_id >> 8);
        }

        if (changed & IEEE802154_AFILT_PANC_CHANGED) {
                adf7242_read_reg(lp, REG_AUTO_CFG, &reg);
                if (filt->pan_coord)
                        reg |= IS_PANCOORD;
                else
                        reg &= ~IS_PANCOORD;
                adf7242_write_reg(lp, REG_AUTO_CFG, reg);
        }

        return 0;
}

static int adf7242_set_promiscuous_mode(struct ieee802154_hw *hw, bool on)
{
        struct adf7242_local *lp = hw->priv;

        dev_dbg(&lp->spi->dev, "%s : mode %d\n", __func__, on);

        lp->promiscuous = on;

        if (on) {
                adf7242_write_reg(lp, REG_AUTO_CFG, 0);
                return adf7242_write_reg(lp, REG_FFILT_CFG,
                                  ACCEPT_BEACON_FRAMES |
                                  ACCEPT_DATA_FRAMES |
                                  ACCEPT_MACCMD_FRAMES |
                                  ACCEPT_ALL_ADDRESS |
                                  ACCEPT_ACK_FRAMES |
                                  ACCEPT_RESERVED_FRAMES);
        } else {
                adf7242_write_reg(lp, REG_FFILT_CFG,
                                  ACCEPT_BEACON_FRAMES |
                                  ACCEPT_DATA_FRAMES |
                                  ACCEPT_MACCMD_FRAMES |
                                  ACCEPT_RESERVED_FRAMES);

                return adf7242_write_reg(lp, REG_AUTO_CFG, RX_AUTO_ACK_EN);
        }
}

static int adf7242_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
{
        struct adf7242_local *lp = hw->priv;
        s8 level = clamp_t(s8, mbm / 100, S8_MIN, S8_MAX);

        dev_dbg(&lp->spi->dev, "%s : level %d\n", __func__, level);

        return adf7242_write_reg(lp, REG_CCA1, level);
}

static int adf7242_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
{
        struct adf7242_local *lp = hw->priv;
        int ret;

        /* ensure existing instances of the IRQ handler have completed */
        disable_irq(lp->spi->irq);
        set_bit(FLAG_XMIT, &lp->flags);
        cancel_delayed_work_sync(&lp->work);
        reinit_completion(&lp->tx_complete);
        adf7242_cmd(lp, CMD_RC_PHY_RDY);
        adf7242_clear_irqstat(lp);

        ret = adf7242_write_fbuf(lp, skb->data, skb->len);
        if (ret)
                goto err;

        ret = adf7242_cmd(lp, CMD_RC_CSMACA);
        if (ret)
                goto err;
        enable_irq(lp->spi->irq);

        ret = wait_for_completion_interruptible_timeout(&lp->tx_complete,
                                                        HZ / 10);
        if (ret < 0)
                goto err;
        if (ret == 0) {
                dev_dbg(&lp->spi->dev, "Timeout waiting for TX interrupt\n");
                ret = -ETIMEDOUT;
                goto err;
        }

        if (lp->tx_stat != SUCCESS) {
                dev_dbg(&lp->spi->dev,
                        "Error xmit: Retry count exceeded Status=0x%x\n",
                        lp->tx_stat);
                ret = -ECOMM;
        } else {
                ret = 0;
        }

err:
        clear_bit(FLAG_XMIT, &lp->flags);
        adf7242_cmd_rx(lp);

        return ret;
}

static int adf7242_rx(struct adf7242_local *lp)
{
        struct sk_buff *skb;
        size_t len;
        int ret;
        u8 lqi, len_u8, *data;

        adf7242_read_reg(lp, 0, &len_u8);

        len = len_u8;

        if (!ieee802154_is_valid_psdu_len(len)) {
                dev_dbg(&lp->spi->dev,
                        "corrupted frame received len %d\n", (int)len);
                len = IEEE802154_MTU;
        }

        skb = dev_alloc_skb(len);
        if (!skb) {
                adf7242_cmd_rx(lp);
                return -ENOMEM;
        }

        data = skb_put(skb, len);
        ret = adf7242_read_fbuf(lp, data, len, true);
        if (ret < 0) {
                kfree_skb(skb);
                adf7242_cmd_rx(lp);
                return ret;
        }

        lqi = data[len - 2];
        lp->rssi = data[len - 1];

        ret = adf7242_cmd_rx(lp);

        skb_trim(skb, len - 2); /* Don't put RSSI/LQI or CRC into the frame */

        ieee802154_rx_irqsafe(lp->hw, skb, lqi);

        dev_dbg(&lp->spi->dev, "%s: ret=%d len=%d lqi=%d rssi=%d\n",
                __func__, ret, (int)len, (int)lqi, lp->rssi);

        return ret;
}

static const struct ieee802154_ops adf7242_ops = {
        .owner = THIS_MODULE,
        .xmit_sync = adf7242_xmit,
        .ed = adf7242_ed,
        .set_channel = adf7242_channel,
        .set_hw_addr_filt = adf7242_set_hw_addr_filt,
        .start = adf7242_start,
        .stop = adf7242_stop,
        .set_csma_params = adf7242_set_csma_params,
        .set_frame_retries = adf7242_set_frame_retries,
        .set_txpower = adf7242_set_txpower,
        .set_promiscuous_mode = adf7242_set_promiscuous_mode,
        .set_cca_ed_level = adf7242_set_cca_ed_level,
};

static void adf7242_debug(struct adf7242_local *lp, u8 irq1)
{
#ifdef DEBUG
        u8 stat;

        adf7242_status(lp, &stat);

        dev_dbg(&lp->spi->dev, "%s IRQ1 = %X:\n%s%s%s%s%s%s%s%s\n",
                __func__, irq1,
                irq1 & IRQ_CCA_COMPLETE ? "IRQ_CCA_COMPLETE\n" : "",
                irq1 & IRQ_SFD_RX ? "IRQ_SFD_RX\n" : "",
                irq1 & IRQ_SFD_TX ? "IRQ_SFD_TX\n" : "",
                irq1 & IRQ_RX_PKT_RCVD ? "IRQ_RX_PKT_RCVD\n" : "",
                irq1 & IRQ_TX_PKT_SENT ? "IRQ_TX_PKT_SENT\n" : "",
                irq1 & IRQ_CSMA_CA ? "IRQ_CSMA_CA\n" : "",
                irq1 & IRQ_FRAME_VALID ? "IRQ_FRAME_VALID\n" : "",
                irq1 & IRQ_ADDRESS_VALID ? "IRQ_ADDRESS_VALID\n" : "");

        dev_dbg(&lp->spi->dev, "%s STATUS = %X:\n%s\n%s\n%s\n%s\n%s%s%s%s%s\n",
                __func__, stat,
                stat & STAT_SPI_READY ? "SPI_READY" : "SPI_BUSY",
                stat & STAT_IRQ_STATUS ? "IRQ_PENDING" : "IRQ_CLEAR",
                stat & STAT_RC_READY ? "RC_READY" : "RC_BUSY",
                stat & STAT_CCA_RESULT ? "CHAN_IDLE" : "CHAN_BUSY",
                (stat & 0xf) == RC_STATUS_IDLE ? "RC_STATUS_IDLE" : "",
                (stat & 0xf) == RC_STATUS_MEAS ? "RC_STATUS_MEAS" : "",
                (stat & 0xf) == RC_STATUS_PHY_RDY ? "RC_STATUS_PHY_RDY" : "",
                (stat & 0xf) == RC_STATUS_RX ? "RC_STATUS_RX" : "",
                (stat & 0xf) == RC_STATUS_TX ? "RC_STATUS_TX" : "");
#endif
}

static irqreturn_t adf7242_isr(int irq, void *data)
{
        struct adf7242_local *lp = data;
        unsigned int xmit;
        u8 irq1;

        mod_delayed_work(lp->wqueue, &lp->work, msecs_to_jiffies(400));
        adf7242_read_reg(lp, REG_IRQ1_SRC1, &irq1);

        if (!(irq1 & (IRQ_RX_PKT_RCVD | IRQ_CSMA_CA)))
                dev_err(&lp->spi->dev, "%s :ERROR IRQ1 = 0x%X\n",
                        __func__, irq1);

        adf7242_debug(lp, irq1);

        xmit = test_bit(FLAG_XMIT, &lp->flags);

        if (xmit && (irq1 & IRQ_CSMA_CA)) {
                adf7242_wait_status(lp, RC_STATUS_PHY_RDY,
                                    RC_STATUS_MASK, __LINE__);

                if (ADF7242_REPORT_CSMA_CA_STAT) {
                        u8 astat;

                        adf7242_read_reg(lp, REG_AUTO_STATUS, &astat);
                        astat &= AUTO_STATUS_MASK;

                        dev_dbg(&lp->spi->dev, "AUTO_STATUS = %X:\n%s%s%s%s\n",
                                astat,

                                astat == SUCCESS ? "SUCCESS" : "",
                                astat ==
                                SUCCESS_DATPEND ? "SUCCESS_DATPEND" : "",
                                astat == FAILURE_CSMACA ? "FAILURE_CSMACA" : "",
                                astat == FAILURE_NOACK ? "FAILURE_NOACK" : "");

                        /* save CSMA-CA completion status */
                        lp->tx_stat = astat;
                } else {
                        lp->tx_stat = SUCCESS;
                }
                complete(&lp->tx_complete);
                adf7242_clear_irqstat(lp);
        } else if (!xmit && (irq1 & IRQ_RX_PKT_RCVD) &&
                   (irq1 & IRQ_FRAME_VALID)) {
                adf7242_rx(lp);
        } else if (!xmit && test_bit(FLAG_START, &lp->flags)) {
                /* Invalid packet received - drop it and restart */
                dev_dbg(&lp->spi->dev, "%s:%d : ERROR IRQ1 = 0x%X\n",
                        __func__, __LINE__, irq1);
                adf7242_cmd(lp, CMD_RC_PHY_RDY);
                adf7242_cmd_rx(lp);
        } else {
                /* This can only be xmit without IRQ, likely a RX packet.
                 * we get an TX IRQ shortly - do nothing or let the xmit
                 * timeout handle this
                 */

                dev_dbg(&lp->spi->dev, "%s:%d : ERROR IRQ1 = 0x%X, xmit %d\n",
                        __func__, __LINE__, irq1, xmit);
                adf7242_wait_status(lp, RC_STATUS_PHY_RDY,
                                    RC_STATUS_MASK, __LINE__);
                complete(&lp->tx_complete);
                adf7242_clear_irqstat(lp);
        }

        return IRQ_HANDLED;
}

static int adf7242_soft_reset(struct adf7242_local *lp, int line)
{
        dev_warn(&lp->spi->dev, "%s (line %d)\n", __func__, line);

        if (test_bit(FLAG_START, &lp->flags))
                disable_irq_nosync(lp->spi->irq);

        adf7242_cmd(lp, CMD_RC_PC_RESET_NO_WAIT);
        usleep_range(200, 250);
        adf7242_write_reg(lp, REG_PKT_CFG, ADDON_EN | BIT(2));
        adf7242_cmd(lp, CMD_RC_PHY_RDY);
        adf7242_set_promiscuous_mode(lp->hw, lp->promiscuous);
        adf7242_set_csma_params(lp->hw, lp->min_be, lp->max_be,
                                lp->max_cca_retries);
        adf7242_clear_irqstat(lp);

        if (test_bit(FLAG_START, &lp->flags)) {
                enable_irq(lp->spi->irq);
                return adf7242_cmd(lp, CMD_RC_RX);
        }

        return 0;
}

static int adf7242_hw_init(struct adf7242_local *lp)
{
        int ret;
        const struct firmware *fw;

        adf7242_cmd(lp, CMD_RC_RESET);
        adf7242_cmd(lp, CMD_RC_IDLE);

        /* get ADF7242 addon firmware
         * build this driver as module
         * and place under /lib/firmware/adf7242_firmware.bin
         * or compile firmware into the kernel.
         */
        ret = request_firmware(&fw, FIRMWARE, &lp->spi->dev);
        if (ret) {
                dev_err(&lp->spi->dev,
                        "request_firmware() failed with %d\n", ret);
                return ret;
        }

        ret = adf7242_upload_firmware(lp, (u8 *)fw->data, fw->size);
        if (ret) {
                dev_err(&lp->spi->dev,
                        "upload firmware failed with %d\n", ret);
                release_firmware(fw);
                return ret;
        }

        ret = adf7242_verify_firmware(lp, (u8 *)fw->data, fw->size);
        if (ret) {
                dev_err(&lp->spi->dev,
                        "verify firmware failed with %d\n", ret);
                release_firmware(fw);
                return ret;
        }

        adf7242_cmd(lp, CMD_RC_PC_RESET);

        release_firmware(fw);

        adf7242_write_reg(lp, REG_FFILT_CFG,
                          ACCEPT_BEACON_FRAMES |
                          ACCEPT_DATA_FRAMES |
                          ACCEPT_MACCMD_FRAMES |
                          ACCEPT_RESERVED_FRAMES);

        adf7242_write_reg(lp, REG_AUTO_CFG, RX_AUTO_ACK_EN);

        adf7242_write_reg(lp, REG_PKT_CFG, ADDON_EN | BIT(2));

        adf7242_write_reg(lp, REG_EXTPA_MSC, 0xF1);
        adf7242_write_reg(lp, REG_RXFE_CFG, 0x1D);

        adf7242_write_reg(lp, REG_IRQ1_EN0, 0);
        adf7242_write_reg(lp, REG_IRQ1_EN1, IRQ_RX_PKT_RCVD | IRQ_CSMA_CA);

        adf7242_clear_irqstat(lp);
        adf7242_write_reg(lp, REG_IRQ1_SRC0, 0xFF);

        adf7242_cmd(lp, CMD_RC_IDLE);

        return 0;
}

static int adf7242_stats_show(struct seq_file *file, void *offset)
{
        struct adf7242_local *lp = spi_get_drvdata(file->private);
        u8 stat, irq1;

        adf7242_status(lp, &stat);
        adf7242_read_reg(lp, REG_IRQ1_SRC1, &irq1);

        seq_printf(file, "IRQ1 = %X:\n%s%s%s%s%s%s%s%s\n", irq1,
                   irq1 & IRQ_CCA_COMPLETE ? "IRQ_CCA_COMPLETE\n" : "",
                   irq1 & IRQ_SFD_RX ? "IRQ_SFD_RX\n" : "",
                   irq1 & IRQ_SFD_TX ? "IRQ_SFD_TX\n" : "",
                   irq1 & IRQ_RX_PKT_RCVD ? "IRQ_RX_PKT_RCVD\n" : "",
                   irq1 & IRQ_TX_PKT_SENT ? "IRQ_TX_PKT_SENT\n" : "",
                   irq1 & IRQ_CSMA_CA ? "IRQ_CSMA_CA\n" : "",
                   irq1 & IRQ_FRAME_VALID ? "IRQ_FRAME_VALID\n" : "",
                   irq1 & IRQ_ADDRESS_VALID ? "IRQ_ADDRESS_VALID\n" : "");

        seq_printf(file, "STATUS = %X:\n%s\n%s\n%s\n%s\n%s%s%s%s%s\n", stat,
                   stat & STAT_SPI_READY ? "SPI_READY" : "SPI_BUSY",
                   stat & STAT_IRQ_STATUS ? "IRQ_PENDING" : "IRQ_CLEAR",
                   stat & STAT_RC_READY ? "RC_READY" : "RC_BUSY",
                   stat & STAT_CCA_RESULT ? "CHAN_IDLE" : "CHAN_BUSY",
                   (stat & 0xf) == RC_STATUS_IDLE ? "RC_STATUS_IDLE" : "",
                   (stat & 0xf) == RC_STATUS_MEAS ? "RC_STATUS_MEAS" : "",
                   (stat & 0xf) == RC_STATUS_PHY_RDY ? "RC_STATUS_PHY_RDY" : "",
                   (stat & 0xf) == RC_STATUS_RX ? "RC_STATUS_RX" : "",
                   (stat & 0xf) == RC_STATUS_TX ? "RC_STATUS_TX" : "");

        seq_printf(file, "RSSI = %d\n", lp->rssi);

        return 0;
}

static int adf7242_debugfs_init(struct adf7242_local *lp)
{
        char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "adf7242-";
        struct dentry *stats;

        strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);

        lp->debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
        if (IS_ERR_OR_NULL(lp->debugfs_root))
                return PTR_ERR_OR_ZERO(lp->debugfs_root);

        stats = debugfs_create_devm_seqfile(&lp->spi->dev, "status",
                                            lp->debugfs_root,
                                            adf7242_stats_show);
        return PTR_ERR_OR_ZERO(stats);

        return 0;
}

static const s32 adf7242_powers[] = {
        500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
        -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
        -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
};

static const s32 adf7242_ed_levels[] = {
        -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, -3900, -3800, -3700, -3600, -3500, -3400, -3200, -3100, -3000
};

static int adf7242_probe(struct spi_device *spi)
{
        struct ieee802154_hw *hw;
        struct adf7242_local *lp;
        int ret, irq_type;

        if (!spi->irq) {
                dev_err(&spi->dev, "no IRQ specified\n");
                return -EINVAL;
        }

        hw = ieee802154_alloc_hw(sizeof(*lp), &adf7242_ops);
        if (!hw)
                return -ENOMEM;

        lp = hw->priv;
        lp->hw = hw;
        lp->spi = spi;

        hw->priv = lp;
        hw->parent = &spi->dev;
        hw->extra_tx_headroom = 0;

        /* We support only 2.4 Ghz */
        hw->phy->supported.channels[0] = 0x7FFF800;

        hw->flags = IEEE802154_HW_OMIT_CKSUM |
                    IEEE802154_HW_CSMA_PARAMS |
                    IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
                    IEEE802154_HW_PROMISCUOUS;

        hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
                         WPAN_PHY_FLAG_CCA_ED_LEVEL |
                         WPAN_PHY_FLAG_CCA_MODE;

        hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY);

        hw->phy->supported.cca_ed_levels = adf7242_ed_levels;
        hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(adf7242_ed_levels);

        hw->phy->cca.mode = NL802154_CCA_ENERGY;

        hw->phy->supported.tx_powers = adf7242_powers;
        hw->phy->supported.tx_powers_size = ARRAY_SIZE(adf7242_powers);

        hw->phy->supported.min_minbe = 0;
        hw->phy->supported.max_minbe = 8;

        hw->phy->supported.min_maxbe = 3;
        hw->phy->supported.max_maxbe = 8;

        hw->phy->supported.min_frame_retries = 0;
        hw->phy->supported.max_frame_retries = 15;

        hw->phy->supported.min_csma_backoffs = 0;
        hw->phy->supported.max_csma_backoffs = 5;

        ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);

        mutex_init(&lp->bmux);
        init_completion(&lp->tx_complete);

        /* Setup Status Message */
        lp->stat_xfer.len = 1;
        lp->stat_xfer.tx_buf = &lp->buf_stat_tx;
        lp->stat_xfer.rx_buf = &lp->buf_stat_rx;
        lp->buf_stat_tx = CMD_SPI_NOP;

        spi_message_init(&lp->stat_msg);
        spi_message_add_tail(&lp->stat_xfer, &lp->stat_msg);

        spi_set_drvdata(spi, lp);
        INIT_DELAYED_WORK(&lp->work, adf7242_rx_cal_work);
        lp->wqueue = alloc_ordered_workqueue(dev_name(&spi->dev),
                                             WQ_MEM_RECLAIM);
        if (unlikely(!lp->wqueue)) {
                ret = -ENOMEM;
                goto err_hw_init;
        }

        ret = adf7242_hw_init(lp);
        if (ret)
                goto err_hw_init;

        irq_type = irq_get_trigger_type(spi->irq);
        if (!irq_type)
                irq_type = IRQF_TRIGGER_HIGH;

        ret = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, adf7242_isr,
                                        irq_type | IRQF_ONESHOT,
                                        dev_name(&spi->dev), lp);
        if (ret)
                goto err_hw_init;

        disable_irq(spi->irq);

        ret = ieee802154_register_hw(lp->hw);
        if (ret)
                goto err_hw_init;

        dev_set_drvdata(&spi->dev, lp);

        adf7242_debugfs_init(lp);

        dev_info(&spi->dev, "mac802154 IRQ-%d registered\n", spi->irq);

        return ret;

err_hw_init:
        mutex_destroy(&lp->bmux);
        ieee802154_free_hw(lp->hw);

        return ret;
}

static int adf7242_remove(struct spi_device *spi)
{
        struct adf7242_local *lp = spi_get_drvdata(spi);

        debugfs_remove_recursive(lp->debugfs_root);

        cancel_delayed_work_sync(&lp->work);
        destroy_workqueue(lp->wqueue);

        ieee802154_unregister_hw(lp->hw);
        mutex_destroy(&lp->bmux);
        ieee802154_free_hw(lp->hw);

        return 0;
}

static const struct of_device_id adf7242_of_match[] = {
        { .compatible = "adi,adf7242", },
        { .compatible = "adi,adf7241", },
        { },
};
MODULE_DEVICE_TABLE(of, adf7242_of_match);

static const struct spi_device_id adf7242_device_id[] = {
        { .name = "adf7242", },
        { .name = "adf7241", },
        { },
};
MODULE_DEVICE_TABLE(spi, adf7242_device_id);

static struct spi_driver adf7242_driver = {
        .id_table = adf7242_device_id,
        .driver = {
                   .of_match_table = of_match_ptr(adf7242_of_match),
                   .name = "adf7242",
                   .owner = THIS_MODULE,
                   },
        .probe = adf7242_probe,
        .remove = adf7242_remove,
};

module_spi_driver(adf7242_driver);

MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("ADF7242 IEEE802.15.4 Transceiver Driver");
MODULE_LICENSE("GPL");