[PATCH v5 1/2] iio: frequency: adrf6780: add support for ADRF6780
From: Antoniu Miclaus
Date: Thu Jul 15 2021 - 07:42:54 EST
The ADRF6780 is a silicon germanium (SiGe) design, wideband,
microwave upconverter optimized for point to point microwave
radio designs operating in the 5.9 GHz to 23.6 GHz frequency
range.
Datasheet:
https://www.analog.com/media/en/technical-documentation/data-sheets/ADRF6780.pdf
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx>
---
changes in v5:
- drop `depends on OF`
- include `linux/mod_devicetable.h`
- use FIELD_GET/FIELD_PREP inline
- use dma safe buffers
- use `get_unaligned_be24()` and `put_unaligned_be24()` where needed
- use `if (ret)` instead of `if (ret < 0)`
- remove locked version of `adrf6780_spi_update_bits`
- add `adrf6780_read_voltage_raw`
- use switch statements for `IIO_MOD`
- other minor fixes
drivers/iio/frequency/Kconfig | 12 +
drivers/iio/frequency/Makefile | 1 +
drivers/iio/frequency/adrf6780.c | 474 +++++++++++++++++++++++++++++++
3 files changed, 487 insertions(+)
create mode 100644 drivers/iio/frequency/adrf6780.c
diff --git a/drivers/iio/frequency/Kconfig b/drivers/iio/frequency/Kconfig
index 240b81502512..2c9e0559e8a4 100644
--- a/drivers/iio/frequency/Kconfig
+++ b/drivers/iio/frequency/Kconfig
@@ -49,5 +49,17 @@ config ADF4371
To compile this driver as a module, choose M here: the
module will be called adf4371.
+
+config ADRF6780
+ tristate "Analog Devices ADRF6780 Microwave Upconverter"
+ depends on SPI
+ depends on COMMON_CLK
+ help
+ Say yes here to build support for Analog Devices ADRF6780
+ 5.9 GHz to 23.6 GHz, Wideband, Microwave Upconverter.
+
+ To compile this driver as a module, choose M here: the
+ module will be called adrf6780.
+
endmenu
endmenu
diff --git a/drivers/iio/frequency/Makefile b/drivers/iio/frequency/Makefile
index 518b1e50caef..ae3136c79202 100644
--- a/drivers/iio/frequency/Makefile
+++ b/drivers/iio/frequency/Makefile
@@ -7,3 +7,4 @@
obj-$(CONFIG_AD9523) += ad9523.o
obj-$(CONFIG_ADF4350) += adf4350.o
obj-$(CONFIG_ADF4371) += adf4371.o
+obj-$(CONFIG_ADRF6780) += adrf6780.o
diff --git a/drivers/iio/frequency/adrf6780.c b/drivers/iio/frequency/adrf6780.c
new file mode 100644
index 000000000000..7583360cb555
--- /dev/null
+++ b/drivers/iio/frequency/adrf6780.c
@@ -0,0 +1,474 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ADRF6780 driver
+ *
+ * Copyright 2021 Analog Devices Inc.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/spi/spi.h>
+
+#include <asm/unaligned.h>
+
+/* ADRF6780 Register Map */
+#define ADRF6780_REG_CONTROL 0x00
+#define ADRF6780_REG_ALARM_READBACK 0x01
+#define ADRF6780_REG_ALARM_MASKS 0x02
+#define ADRF6780_REG_ENABLE 0x03
+#define ADRF6780_REG_LINEARIZE 0x04
+#define ADRF6780_REG_LO_PATH 0x05
+#define ADRF6780_REG_ADC_CONTROL 0x06
+#define ADRF6780_REG_ADC_OUTPUT 0x0C
+
+/* ADRF6780_REG_CONTROL Map */
+#define ADRF6780_PARITY_EN_MSK BIT(15)
+#define ADRF6780_SOFT_RESET_MSK BIT(14)
+#define ADRF6780_CHIP_ID_MSK GENMASK(11, 4)
+#define ADRF6780_CHIP_ID 0xA
+#define ADRF6780_CHIP_REVISION_MSK GENMASK(3, 0)
+
+/* ADRF6780_REG_ALARM_READBACK Map */
+#define ADRF6780_PARITY_ERROR_MSK BIT(15)
+#define ADRF6780_TOO_FEW_ERRORS_MSK BIT(14)
+#define ADRF6780_TOO_MANY_ERRORS_MSK BIT(13)
+#define ADRF6780_ADDRESS_RANGE_ERROR_MSK BIT(12)
+
+/* ADRF6780_REG_ENABLE Map */
+#define ADRF6780_VGA_BUFFER_EN_MSK BIT(8)
+#define ADRF6780_DETECTOR_EN_MSK BIT(7)
+#define ADRF6780_LO_BUFFER_EN_MSK BIT(6)
+#define ADRF6780_IF_MODE_EN_MSK BIT(5)
+#define ADRF6780_IQ_MODE_EN_MSK BIT(4)
+#define ADRF6780_LO_X2_EN_MSK BIT(3)
+#define ADRF6780_LO_PPF_EN_MSK BIT(2)
+#define ADRF6780_LO_EN_MSK BIT(1)
+#define ADRF6780_UC_BIAS_EN_MSK BIT(0)
+
+/* ADRF6780_REG_LINEARIZE Map */
+#define ADRF6780_RDAC_LINEARIZE_MSK GENMASK(7, 0)
+
+/* ADRF6780_REG_LO_PATH Map */
+#define ADRF6780_LO_SIDEBAND_MSK BIT(10)
+#define ADRF6780_Q_PATH_PHASE_ACCURACY_MSK GENMASK(7, 4)
+#define ADRF6780_I_PATH_PHASE_ACCURACY_MSK GENMASK(3, 0)
+
+/* ADRF6780_REG_ADC_CONTROL Map */
+#define ADRF6780_VDET_OUTPUT_SELECT_MSK BIT(3)
+#define ADRF6780_ADC_START_MSK BIT(2)
+#define ADRF6780_ADC_EN_MSK BIT(1)
+#define ADRF6780_ADC_CLOCK_EN_MSK BIT(0)
+
+/* ADRF6780_REG_ADC_OUTPUT Map */
+#define ADRF6780_ADC_STATUS_MSK BIT(8)
+#define ADRF6780_ADC_VALUE_MSK GENMASK(7, 0)
+
+struct adrf6780_dev {
+ struct spi_device *spi;
+ struct clk *clkin;
+ /* Protect against concurrent accesses to the device */
+ struct mutex lock;
+ bool vga_buff_en;
+ bool lo_buff_en;
+ bool if_mode_en;
+ bool iq_mode_en;
+ bool lo_x2_en;
+ bool lo_ppf_en;
+ bool lo_en;
+ bool uc_bias_en;
+ bool lo_sideband;
+ bool vdet_out_en;
+ u8 data[3] ____cacheline_aligned;
+};
+
+static int adrf6780_spi_read(struct adrf6780_dev *dev, unsigned int reg,
+ unsigned int *val)
+{
+ int ret;
+ struct spi_transfer t = {0};
+
+ dev->data[0] = 0x80 | (reg << 1);
+ dev->data[1] = 0x0;
+ dev->data[2] = 0x0;
+
+ t.rx_buf = &dev->data[0];
+ t.tx_buf = &dev->data[0];
+ t.len = 3;
+
+ ret = spi_sync_transfer(dev->spi, &t, 1);
+ if (ret)
+ return ret;
+
+ *val = (get_unaligned_be24(&dev->data[0]) >> 1) & GENMASK(15, 0);
+
+ return ret;
+}
+
+static int adrf6780_spi_write(struct adrf6780_dev *dev,
+ unsigned int reg,
+ unsigned int val)
+{
+ put_unaligned_be24((val << 1) | (reg << 17), &dev->data[0]);
+
+ return spi_write(dev->spi, &dev->data[0], 3);
+}
+
+static int adrf6780_spi_update_bits(struct adrf6780_dev *dev, unsigned int reg,
+ unsigned int mask, unsigned int val)
+{
+ int ret;
+ unsigned int data, temp;
+
+ ret = adrf6780_spi_read(dev, reg, &data);
+ if (ret)
+ return ret;
+
+ temp = (data & ~mask) | (val & mask);
+
+ return adrf6780_spi_write(dev, reg, temp);
+}
+
+static int adrf6780_read_voltage_raw(struct adrf6780_dev *dev, unsigned int read_val)
+{
+ int ret;
+
+ mutex_lock(&dev->lock);
+
+ ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_ADC_CONTROL,
+ ADRF6780_ADC_EN_MSK |
+ ADRF6780_ADC_CLOCK_EN_MSK |
+ ADRF6780_ADC_START_MSK,
+ FIELD_PREP(ADRF6780_ADC_EN_MSK, 1) |
+ FIELD_PREP(ADRF6780_ADC_CLOCK_EN_MSK, 1) |
+ FIELD_PREP(ADRF6780_ADC_START_MSK, 1));
+ if (ret)
+ goto exit;
+
+ usleep_range(200, 250);
+
+ ret = adrf6780_spi_read(dev, ADRF6780_REG_ADC_OUTPUT, &read_val);
+ if (ret)
+ goto exit;
+
+ if (!(read_val & ADRF6780_ADC_STATUS_MSK)) {
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_ADC_CONTROL,
+ ADRF6780_ADC_START_MSK,
+ FIELD_PREP(ADRF6780_ADC_START_MSK, 0));
+ if (ret)
+ goto exit;
+
+ ret = adrf6780_spi_read(dev, ADRF6780_REG_ADC_OUTPUT, &read_val);
+
+exit:
+ mutex_unlock(&dev->lock);
+ return ret;
+}
+
+static int adrf6780_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long info)
+{
+ struct adrf6780_dev *dev = iio_priv(indio_dev);
+ unsigned int data;
+ int ret;
+
+ switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ ret = adrf6780_read_voltage_raw(dev, data);
+ if (ret)
+ return ret;
+
+ *val = data & ADRF6780_ADC_VALUE_MSK;
+
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_SCALE:
+ ret = adrf6780_spi_read(dev, ADRF6780_REG_LINEARIZE, &data);
+ if (ret)
+ return ret;
+
+ *val = data & ADRF6780_RDAC_LINEARIZE_MSK;
+
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_PHASE:
+ ret = adrf6780_spi_read(dev, ADRF6780_REG_LO_PATH, &data);
+ if (ret)
+ return ret;
+
+ switch (chan->channel2) {
+ case IIO_MOD_I:
+ *val = data & ADRF6780_I_PATH_PHASE_ACCURACY_MSK;
+
+ return IIO_VAL_INT;
+ case IIO_MOD_Q:
+ *val = FIELD_GET(ADRF6780_Q_PATH_PHASE_ACCURACY_MSK, data);
+
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static int adrf6780_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long info)
+{
+ struct adrf6780_dev *dev = iio_priv(indio_dev);
+ int ret;
+
+ switch (info) {
+ case IIO_CHAN_INFO_SCALE:
+ return adrf6780_spi_write(dev, ADRF6780_REG_LINEARIZE, val);
+ case IIO_CHAN_INFO_PHASE:
+ switch (chan->channel2) {
+ case IIO_MOD_I:
+ mutex_lock(&dev->lock);
+ ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_LO_PATH,
+ ADRF6780_I_PATH_PHASE_ACCURACY_MSK,
+ FIELD_PREP(ADRF6780_I_PATH_PHASE_ACCURACY_MSK, val));
+ mutex_unlock(&dev->lock);
+
+ return ret;
+ case IIO_MOD_Q:
+ mutex_lock(&dev->lock);
+ ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_LO_PATH,
+ ADRF6780_Q_PATH_PHASE_ACCURACY_MSK,
+ FIELD_PREP(ADRF6780_Q_PATH_PHASE_ACCURACY_MSK, val));
+ mutex_unlock(&dev->lock);
+
+ return ret;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static int adrf6780_reg_access(struct iio_dev *indio_dev,
+ unsigned int reg,
+ unsigned int write_val,
+ unsigned int *read_val)
+{
+ struct adrf6780_dev *dev = iio_priv(indio_dev);
+
+ if (read_val)
+ return adrf6780_spi_read(dev, reg, read_val);
+ else
+ return adrf6780_spi_write(dev, reg, write_val);
+}
+
+static const struct iio_info adrf6780_info = {
+ .read_raw = adrf6780_read_raw,
+ .write_raw = adrf6780_write_raw,
+ .debugfs_reg_access = &adrf6780_reg_access,
+};
+
+#define ADRF6780_CHAN(_channel) { \
+ .type = IIO_VOLTAGE, \
+ .output = 1, \
+ .indexed = 1, \
+ .channel = _channel, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_SCALE) \
+}
+
+#define ADRF6780_CHAN_IQ(_channel, rf_comp) { \
+ .type = IIO_ALTVOLTAGE, \
+ .modified = 1, \
+ .output = 1, \
+ .indexed = 1, \
+ .channel2 = IIO_MOD_##rf_comp, \
+ .channel = _channel, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PHASE) \
+}
+
+static const struct iio_chan_spec adrf6780_channels[] = {
+ ADRF6780_CHAN(0),
+ ADRF6780_CHAN_IQ(0, I),
+ ADRF6780_CHAN_IQ(0, Q),
+};
+
+static int adrf6780_reset(struct adrf6780_dev *dev)
+{
+ int ret;
+ struct spi_device *spi = dev->spi;
+
+ ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_CONTROL,
+ ADRF6780_SOFT_RESET_MSK,
+ FIELD_PREP(ADRF6780_SOFT_RESET_MSK, 1));
+ if (ret) {
+ dev_err(&spi->dev, "ADRF6780 SPI software reset failed.\n");
+ return ret;
+ }
+
+ ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_CONTROL,
+ ADRF6780_SOFT_RESET_MSK,
+ FIELD_PREP(ADRF6780_SOFT_RESET_MSK, 0));
+ if (ret) {
+ dev_err(&spi->dev, "ADRF6780 SPI software reset disable failed.\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int adrf6780_init(struct adrf6780_dev *dev)
+{
+ int ret;
+ unsigned int chip_id, enable_reg, enable_reg_msk;
+ struct spi_device *spi = dev->spi;
+
+ /* Perform a software reset */
+ ret = adrf6780_reset(dev);
+ if (ret)
+ return ret;
+
+ ret = adrf6780_spi_read(dev, ADRF6780_REG_CONTROL, &chip_id);
+ if (ret)
+ return ret;
+
+ chip_id = FIELD_GET(ADRF6780_CHIP_ID_MSK, chip_id);
+ if (chip_id != ADRF6780_CHIP_ID) {
+ dev_err(&spi->dev, "ADRF6780 Invalid Chip ID.\n");
+ return -EINVAL;
+ }
+
+ enable_reg_msk = ADRF6780_VGA_BUFFER_EN_MSK |
+ ADRF6780_DETECTOR_EN_MSK |
+ ADRF6780_LO_BUFFER_EN_MSK |
+ ADRF6780_IF_MODE_EN_MSK |
+ ADRF6780_IQ_MODE_EN_MSK |
+ ADRF6780_LO_X2_EN_MSK |
+ ADRF6780_LO_PPF_EN_MSK |
+ ADRF6780_LO_EN_MSK |
+ ADRF6780_UC_BIAS_EN_MSK;
+
+ enable_reg = FIELD_PREP(ADRF6780_VGA_BUFFER_EN_MSK, dev->vga_buff_en) |
+ FIELD_PREP(ADRF6780_DETECTOR_EN_MSK, 1) |
+ FIELD_PREP(ADRF6780_LO_BUFFER_EN_MSK, dev->lo_buff_en) |
+ FIELD_PREP(ADRF6780_IF_MODE_EN_MSK, dev->if_mode_en) |
+ FIELD_PREP(ADRF6780_IQ_MODE_EN_MSK, dev->iq_mode_en) |
+ FIELD_PREP(ADRF6780_LO_X2_EN_MSK, dev->lo_x2_en) |
+ FIELD_PREP(ADRF6780_LO_PPF_EN_MSK, dev->lo_ppf_en) |
+ FIELD_PREP(ADRF6780_LO_EN_MSK, dev->lo_en) |
+ FIELD_PREP(ADRF6780_UC_BIAS_EN_MSK, dev->uc_bias_en);
+
+ ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_ENABLE, enable_reg_msk, enable_reg);
+ if (ret)
+ return ret;
+
+ ret = adrf6780_spi_update_bits(dev, ADRF6780_REG_LO_PATH,
+ ADRF6780_LO_SIDEBAND_MSK,
+ FIELD_PREP(ADRF6780_LO_SIDEBAND_MSK, dev->lo_sideband));
+ if (ret)
+ return ret;
+
+ return adrf6780_spi_update_bits(dev, ADRF6780_REG_ADC_CONTROL,
+ ADRF6780_VDET_OUTPUT_SELECT_MSK,
+ FIELD_PREP(ADRF6780_VDET_OUTPUT_SELECT_MSK, dev->vdet_out_en));
+}
+
+static void adrf6780_clk_disable(void *data)
+{
+ clk_disable_unprepare(data);
+}
+
+static void adrf6780_dt_parse(struct adrf6780_dev *dev)
+{
+ struct spi_device *spi = dev->spi;
+
+ dev->vga_buff_en = device_property_read_bool(&spi->dev, "adi,vga-buff-en");
+ dev->lo_buff_en = device_property_read_bool(&spi->dev, "adi,lo-buff-en");
+ dev->if_mode_en = device_property_read_bool(&spi->dev, "adi,if-mode-en");
+ dev->iq_mode_en = device_property_read_bool(&spi->dev, "adi,iq-mode-en");
+ dev->lo_x2_en = device_property_read_bool(&spi->dev, "adi,lo-x2-en");
+ dev->lo_ppf_en = device_property_read_bool(&spi->dev, "adi,lo-ppf-en");
+ dev->lo_en = device_property_read_bool(&spi->dev, "adi,lo-en");
+ dev->uc_bias_en = device_property_read_bool(&spi->dev, "adi,uc-bias-en");
+ dev->lo_sideband = device_property_read_bool(&spi->dev, "adi,lo-sideband");
+ dev->vdet_out_en = device_property_read_bool(&spi->dev, "adi,vdet-out-en");
+}
+
+static int adrf6780_probe(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev;
+ struct adrf6780_dev *dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*dev));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ dev = iio_priv(indio_dev);
+
+ indio_dev->info = &adrf6780_info;
+ indio_dev->name = "adrf6780";
+ indio_dev->channels = adrf6780_channels;
+ indio_dev->num_channels = ARRAY_SIZE(adrf6780_channels);
+
+ dev->spi = spi;
+
+ adrf6780_dt_parse(dev);
+
+ dev->clkin = devm_clk_get(&spi->dev, "lo_in");
+ if (IS_ERR(dev->clkin))
+ return PTR_ERR(dev->clkin);
+
+ ret = clk_prepare_enable(dev->clkin);
+ if (ret < 0)
+ return ret;
+
+ ret = devm_add_action_or_reset(&spi->dev, adrf6780_clk_disable, dev->clkin);
+ if (ret < 0)
+ return ret;
+
+ mutex_init(&dev->lock);
+
+ ret = adrf6780_init(dev);
+ if (ret)
+ return ret;
+
+ return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static const struct spi_device_id adrf6780_id[] = {
+ { "adrf6780", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(spi, adrf6780_id);
+
+static const struct of_device_id adrf6780_of_match[] = {
+ { .compatible = "adi,adrf6780" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, adrf6780_of_match);
+
+static struct spi_driver adrf6780_driver = {
+ .driver = {
+ .name = "adrf6780",
+ .of_match_table = adrf6780_of_match,
+ },
+ .probe = adrf6780_probe,
+ .id_table = adrf6780_id,
+};
+module_spi_driver(adrf6780_driver);
+
+MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx");
+MODULE_DESCRIPTION("Analog Devices ADRF6780");
+MODULE_LICENSE("GPL v2");
--
2.32.0