Re: [PATCH v2] drivers/net/ieee802154/adf7242: Driver for ADF7242 MAC IEEE802154

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On 08/12/15 14:37, Stefan Schmidt wrote:
Hello.

On 08/12/15 12:52, michael.hennerich@xxxxxxxxxx wrote:
From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>

This driver has been sitting in the linux-zigbee[2] repository for a long
time. We updated it from time to time and made it available via our
github kernel repository. The Linux MAC802.15.4 support has improved a lot
since then. Thanks to all! So it’s finally time to upstream this driver.

The ADF7242 requires an add-on firmware for the automatic IEEE 802.15.4
operating modes. The firmware file is currently made available on the
ADF7242 wiki page here [1]

[1] http://wiki.analog.com/resources/tools-software/linux-drivers/networking-mac802154/adf7242 [2] http://sourceforge.net/p/linux-zigbee/kernel/ci/devel/tree/drivers/ieee802154/adf7242.c

Changes since v1:
    -Add link to the product page/datasheet.
    -Add missing includes.
    -Use defines for magic PA bias values.
    -Unify wait_ready and wait_status functions.
    -Add RC_BUSY error handling using soft reset.
     Requires some extra cached parameters.
    -Enable adf7242_verify_firmware() only during DEBUG.
    -Fixed some compiler warnings.
    -Removed sysfs status attribute.
    -Added debugfs status file.
    -Enable/Disable IRQ in start/stop.
    -Added missing MAINTAINER entry.
    -Added missing Kconfig help text.

Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
---
  .../devicetree/bindings/net/ieee802154/adf7242.txt |   18 +
  MAINTAINERS                                        |    9 +
  drivers/net/ieee802154/Kconfig                     |   11 +
  drivers/net/ieee802154/Makefile                    |    1 +
drivers/net/ieee802154/adf7242.c | 1251 ++++++++++++++++++++
  5 files changed, 1290 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/ieee802154/adf7242.txt
  create mode 100644 drivers/net/ieee802154/adf7242.c

diff --git a/Documentation/devicetree/bindings/net/ieee802154/adf7242.txt b/Documentation/devicetree/bindings/net/ieee802154/adf7242.txt
new file mode 100644
index 0000000..dea5124
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/ieee802154/adf7242.txt
@@ -0,0 +1,18 @@
+* ADF7242 IEEE 802.15.4 *
+
+Required properties:
+  - compatible:        should be "adi,adf7242"
+  - spi-max-frequency:    maximal bus speed (12.5 MHz)
+  - reg:        the chipselect index
+ - interrupts: the interrupt generated by the device via pin IRQ1.
+            IRQ_TYPE_LEVEL_HIGH (4) or IRQ_TYPE_EDGE_FALLING (1)
+
+Example:
+
+    adf7242@0 {
+        compatible = "adi,adf7242";
+        spi-max-frequency = <10000000>;
+        reg = <0>;
+        interrupts = <98 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-parent = <&gpio3>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index ea17512..240ab8b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -371,6 +371,15 @@ ADDRESS SPACE LAYOUT RANDOMIZATION (ASLR)
  M:    Jiri Kosina <jikos@xxxxxxxxxx>
  S:    Maintained

+ADF7242 IEEE 802.15.4 RADIO DRIVER
+M:    Michael Hennerich <michael.hennerich@xxxxxxxxxx>
+W:    https://wiki.analog.com/ADF7242
+W:    http://ez.analog.com/community/linux-device-drivers
+L:    linux-wpan@xxxxxxxxxxxxxxx
+S:    Supported
+F:    drivers/net/ieee802154/adf7242.c
+F: Documentation/devicetree/bindings/net/ieee802154/adf7242.txt
+
  ADM1025 HARDWARE MONITOR DRIVER
  M:    Jean Delvare <jdelvare@xxxxxxxx>
  L:    lm-sensors@xxxxxxxxxxxxxx
diff --git a/drivers/net/ieee802154/Kconfig b/drivers/net/ieee802154/Kconfig
index ce5f1a2..3057a8d 100644
--- a/drivers/net/ieee802154/Kconfig
+++ b/drivers/net/ieee802154/Kconfig
@@ -71,3 +71,14 @@ config IEEE802154_ATUSB

        This driver can also be built as a module. To do so say M here.
        The module will be called 'atusb'.
+
+config IEEE802154_ADF7242
+       tristate "ADF7242 transceiver driver"
+       depends on IEEE802154_DRIVERS && MAC802154
+       depends on SPI
+    ---help---
+      Say Y here to enable the ADF7242 SPI 802.15.4 wireless
+      controller.
+
+      This driver can also be built as a module. To do so, say M here.
+      the module will be called 'adf7242'.
diff --git a/drivers/net/ieee802154/Makefile b/drivers/net/ieee802154/Makefile
index cf1d2a6..3a923d3 100644
--- a/drivers/net/ieee802154/Makefile
+++ b/drivers/net/ieee802154/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_IEEE802154_AT86RF230) += at86rf230.o
  obj-$(CONFIG_IEEE802154_MRF24J40) += mrf24j40.o
  obj-$(CONFIG_IEEE802154_CC2520) += cc2520.o
  obj-$(CONFIG_IEEE802154_ATUSB) += atusb.o
+obj-$(CONFIG_IEEE802154_ADF7242) += adf7242.o
diff --git a/drivers/net/ieee802154/adf7242.c b/drivers/net/ieee802154/adf7242.c
new file mode 100644
index 0000000..cdbc5ef
--- /dev/null
+++ b/drivers/net/ieee802154/adf7242.c
@@ -0,0 +1,1251 @@
+/*
+ * Analog Devices ADF7242 Low-Power IEEE 802.15.4 Transceiver
+ *
+ * Copyright 2009-2015 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/delay.h>
+#include <linux/debugfs.h>
+#include <linux/ieee802154.h>
+#include <net/mac802154.h>
+#include <net/cfg802154.h>
+
+#define FIRMWARE "adf7242_firmware.bin"
+#define MAX_POLL_LOOPS 200

You increased the MAX_POLL_LOOPS to 200 from 50 here since the last version. Any reason for it?
+
+/* 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)
+
+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;
+    int tx_stat;
+    bool start;
+    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);
+
+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 status,
+                   unsigned 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);
+            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_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_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_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_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_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_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 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_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;
+}
+
+#ifdef DEBUG
+static int adf7242_verify_firmware(struct adf7242_local *lp,
+                   const u8 *data, size_t len)
+{
+    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);
+
+    return 0;
+}
+#endif
+
+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_write_reg(lp, REG_IRQ1_SRC1, 0xFF);
+    enable_irq(lp->spi->irq);
+    lp->start = true;
+
+    return adf7242_cmd(lp, CMD_RC_RX);
+}
+
+static void adf7242_stop(struct ieee802154_hw *hw)
+{
+    struct adf7242_local *lp = hw->priv;
+
+    adf7242_cmd(lp, CMD_RC_IDLE);
+    disable_irq(lp->spi->irq);
+    lp->start = false;
+    adf7242_write_reg(lp, REG_IRQ1_SRC1, 0xFF);
+}
+
+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);
+
+    return adf7242_cmd(lp, CMD_RC_RX);
+}
+
+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;
+
+    reinit_completion(&lp->tx_complete);
+
+    adf7242_cmd(lp, CMD_RC_PHY_RDY);
+
+    ret = adf7242_write_fbuf(lp, skb->data, skb->len);
+    if (ret)
+        goto err;
+
+    ret = adf7242_cmd(lp, CMD_RC_CSMACA);
+    if (ret)
+        goto err;
+
+ ret = wait_for_completion_interruptible_timeout(&lp->tx_complete, HZ);
+    if (ret == -ERESTARTSYS)
+        goto err;
+    if (ret == 0) {
+        dev_warn(&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:
+    adf7242_cmd(lp, CMD_RC_RX);
+    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)
+        return -ENOMEM;
+
+    data = skb_put(skb, len);
+    ret = adf7242_read_fbuf(lp, data, len, true);
+
+    if (!ret) {
+        lqi = data[len - 2];
+        lp->rssi = data[len - 1];
+    }
+
+    adf7242_cmd(lp, CMD_RC_RX);
+
+ 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 0;
+}
+
+static 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 irqreturn_t adf7242_isr(int irq, void *data)
+{
+    struct adf7242_local *lp = data;
+    u8 irq1, auto_stat = 0, stat = 0, rx_en = 0;
+
+ adf7242_wait_status(lp, RC_STATUS_PHY_RDY, RC_STATUS_MASK, __LINE__);
+
+    adf7242_read_reg(lp, REG_IRQ1_SRC1, &irq1);
+    adf7242_write_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);
+
+    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" : "");
+
+    adf7242_status(lp, &stat);
+
+    dev_dbg(&lp->spi->dev, "%s STATUS = %X:\n%s\n%s%s%s%s%s\n",
+        __func__, stat,
+        stat & STAT_RC_READY ? "RC_READY" : "RC_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" : "");
+
+    if ((irq1 & IRQ_RX_PKT_RCVD) && (irq1 & IRQ_FRAME_VALID)) {
+        adf7242_rx(lp);
+        rx_en = 1;
+    }
+
+    if (irq1 & IRQ_CSMA_CA) {
+        adf7242_read_reg(lp, REG_AUTO_STATUS, &auto_stat);
+        auto_stat &= AUTO_STATUS_MASK;
+
+        dev_dbg(&lp->spi->dev, "%s AUTO_STATUS = %X:\n%s%s%s%s\n",
+            __func__, auto_stat,
+            auto_stat == SUCCESS ? "SUCCESS" : "",
+            auto_stat ==
+            SUCCESS_DATPEND ? "SUCCESS_DATPEND" : "",
+            auto_stat == FAILURE_CSMACA ? "FAILURE_CSMACA" : "",
+            auto_stat == FAILURE_NOACK ? "FAILURE_NOACK" : "");
+
+        /* save CSMA-CA completion status */
+        lp->tx_stat = auto_stat;
+        rx_en = 1;
+
+        complete(&lp->tx_complete);
+    }
+
+    if (!rx_en) {
+        adf7242_cmd(lp, CMD_RC_PHY_RDY);
+        adf7242_write_reg(lp, REG_IRQ1_SRC1, 0xFF);
+        adf7242_cmd(lp, CMD_RC_RX);
+    }
+
+    return IRQ_HANDLED;
+}
+
+static int adf7242_soft_reset(struct adf7242_local *lp)
+{
+    dev_warn(&lp->spi->dev, "%s\n", __func__);
+
+    if (lp->start)
+        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_write_reg(lp, REG_IRQ1_SRC1, 0xFF);
+
+    if (lp->start) {
+        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);
+        return ret;
+    }
+
+#ifdef DEBUG
+    ret = adf7242_verify_firmware(lp, (u8 *)fw->data, fw->size);
+    if (ret) {
+        dev_err(&lp->spi->dev,
+            "verify firmware failed with %d\n", ret);
+        return ret;
+    }
+#endif
+
+    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_write_reg(lp, REG_IRQ1_SRC1, 0xFF);
+    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, tmp;

tmp is never used here. Please remove.

Besides the above nothing problematic showed up on my testing.

regards
Stefan Schmidt
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