Re: [PATCH 4/4] Staging: iio: accel: adis16201: Move adis16201 driver out of staging

From: Jonathan Cameron
Date: Sat Mar 24 2018 - 10:26:37 EST

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On Fri, 23 Mar 2018 00:42:45 +0530
Himanshu Jha <himanshujha199640@xxxxxxxxx> wrote:

> Move adis16201 driver out of staging and merge into mainline
> IIO subsystem.
>
> Signed-off-by: Himanshu Jha <himanshujha199640@xxxxxxxxx>

There are a few really minor points inline. However,
non prevent this moving out of staging (and I'll fix one up anyway).

Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Note this won't go upstream now until after the merge window so
will take a little time. Just unfortunate timing against the
normal kernel cycle I'm afraid!

Thanks,

Jonathan

> ---
> drivers/iio/accel/Kconfig | 12 ++
> drivers/iio/accel/Makefile | 1 +
> drivers/iio/accel/adis16201.c | 321 ++++++++++++++++++++++++++++++++++
> drivers/staging/iio/accel/Kconfig | 12 --
> drivers/staging/iio/accel/Makefile | 1 -
> drivers/staging/iio/accel/adis16201.c | 321 ----------------------------------
> 6 files changed, 334 insertions(+), 334 deletions(-)
> create mode 100644 drivers/iio/accel/adis16201.c
> delete mode 100644 drivers/staging/iio/accel/adis16201.c
>
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index c6d9517..9416c6f 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -5,6 +5,18 @@
>
> menu "Accelerometers"
>
> +config ADIS16201
> + tristate "Analog Devices ADIS16201 Dual-Axis Digital Inclinometer and Accelerometer"
> + depends on SPI
> + select IIO_ADIS_LIB
> + select IIO_ADIS_LIB_BUFFER if IIO_BUFFER
> + help
> + Say Y here to build support for Analog Devices adis16201 dual-axis
> + digital inclinometer and accelerometer.
> +
> + To compile this driver as a module, say M here: the module will
> + be called adis16201.
> +
> config ADXL345
> tristate
>
> diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> index 368aedb..7832ec9 100644
> --- a/drivers/iio/accel/Makefile
> +++ b/drivers/iio/accel/Makefile
> @@ -4,6 +4,7 @@
> #
>
> # When adding new entries keep the list in alphabetical order
> +obj-$(CONFIG_ADIS16201) += adis16201.o
> obj-$(CONFIG_ADXL345) += adxl345_core.o
> obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o
> obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o
> diff --git a/drivers/iio/accel/adis16201.c b/drivers/iio/accel/adis16201.c
> new file mode 100644
> index 0000000..51e1afb
> --- /dev/null
> +++ b/drivers/iio/accel/adis16201.c
> @@ -0,0 +1,321 @@
> +/*
> + * ADIS16201 Dual-Axis Digital Inclinometer and Accelerometer
> + *
> + * Copyright 2010 Analog Devices Inc.
> + *
> + * Licensed under the GPL-2 or later.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/slab.h>
> +#include <linux/spi/spi.h>
> +#include <linux/sysfs.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/imu/adis.h>
> +
> +#define ADIS16201_STARTUP_DELAY_MS 220
> +#define ADIS16201_FLASH_CNT 0x00
> +
> +/* Data Output Register Information */
> +#define ADIS16201_SUPPLY_OUT_REG 0x02
> +#define ADIS16201_XACCL_OUT_REG 0x04
> +#define ADIS16201_YACCL_OUT_REG 0x06
> +#define ADIS16201_AUX_ADC_REG 0x08
> +#define ADIS16201_TEMP_OUT_REG 0x0A
> +#define ADIS16201_XINCL_OUT_REG 0x0C
> +#define ADIS16201_YINCL_OUT_REG 0x0E
> +
> +/* Calibration Register Definition */
> +#define ADIS16201_XACCL_OFFS_REG 0x10
> +#define ADIS16201_YACCL_OFFS_REG 0x12
> +#define ADIS16201_XACCL_SCALE_REG 0x14
> +#define ADIS16201_YACCL_SCALE_REG 0x16
> +#define ADIS16201_XINCL_OFFS_REG 0x18
> +#define ADIS16201_YINCL_OFFS_REG 0x1A
> +#define ADIS16201_XINCL_SCALE_REG 0x1C
> +#define ADIS16201_YINCL_SCALE_REG 0x1E
> +
> +/* Alarm Register Definition */
> +#define ADIS16201_ALM_MAG1_REG 0x20
> +#define ADIS16201_ALM_MAG2_REG 0x22
> +#define ADIS16201_ALM_SMPL1_REG 0x24
> +#define ADIS16201_ALM_SMPL2_REG 0x26
> +#define ADIS16201_ALM_CTRL_REG 0x28
> +
> +#define ADIS16201_AUX_DAC_REG 0x30
> +#define ADIS16201_GPIO_CTRL_REG 0x32
> +#define ADIS16201_SMPL_PRD_REG 0x36
> +/* Operation, filter configuration */
> +#define ADIS16201_AVG_CNT_REG 0x38
> +#define ADIS16201_SLP_CNT_REG 0x3A
> +
> +/* Miscellaneous Control Register Definition */
> +#define ADIS16201_MSC_CTRL_REG 0x34
> +#define ADIS16201_MSC_CTRL_SELF_TEST_EN BIT(8)
> +/* Data-ready enable: 1 = enabled, 0 = disabled */
> +#define ADIS16201_MSC_CTRL_DATA_RDY_EN BIT(2)
> +/* Data-ready polarity: 1 = active high, 0 = active low */
> +#define ADIS16201_MSC_CTRL_ACTIVE_DATA_RDY_HIGH BIT(1)
> +/* Data-ready line selection: 1 = DIO1, 0 = DIO0 */
> +#define ADIS16201_MSC_CTRL_DATA_RDY_DIO1 BIT(0)
> +
> +/* Diagnostics System Status Register Definition */
> +#define ADIS16201_DIAG_STAT_REG 0x3C
> +#define ADIS16201_DIAG_STAT_ALARM2 BIT(9)
> +#define ADIS16201_DIAG_STAT_ALARM1 BIT(8)
> +#define ADIS16201_DIAG_STAT_SPI_FAIL_BIT 3
> +#define ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT 2
> +/* Power supply above 3.625 V */
> +#define ADIS16201_DIAG_STAT_POWER_HIGH_BIT 1
> +/* Power supply below 3.15 V */
> +#define ADIS16201_DIAG_STAT_POWER_LOW_BIT 0
> +
> +/* System Command Register Definition */
> +#define ADIS16201_GLOB_CMD_REG 0x3E
> +#define ADIS16201_GLOB_CMD_SW_RESET BIT(7)
> +#define ADIS16201_GLOB_CMD_FACTORY_RESET BIT(1)
> +
> +#define ADIS16201_ERROR_ACTIVE BIT(14)
> +
> +enum adis16201_scan {
> + ADIS16201_SCAN_ACC_X,
> + ADIS16201_SCAN_ACC_Y,
> + ADIS16201_SCAN_INCLI_X,
> + ADIS16201_SCAN_INCLI_Y,
> + ADIS16201_SCAN_SUPPLY,
> + ADIS16201_SCAN_AUX_ADC,
> + ADIS16201_SCAN_TEMP,
> +};
> +
> +static const u8 adis16201_addresses[] = {
> + [ADIS16201_SCAN_ACC_X] = ADIS16201_XACCL_OFFS_REG,
> + [ADIS16201_SCAN_ACC_Y] = ADIS16201_YACCL_OFFS_REG,
> + [ADIS16201_SCAN_INCLI_X] = ADIS16201_XINCL_OFFS_REG,
> + [ADIS16201_SCAN_INCLI_Y] = ADIS16201_YINCL_OFFS_REG,
> +};
> +
> +static int adis16201_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2,
> + long mask)
> +{
> + struct adis *st = iio_priv(indio_dev);
> + int ret;
> + int bits;
> + u8 addr;
> + s16 val16;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + return adis_single_conversion(indio_dev, chan,
> + ADIS16201_ERROR_ACTIVE, val);
> + case IIO_CHAN_INFO_SCALE:
> + switch (chan->type) {
> + case IIO_VOLTAGE:
> + if (chan->channel == 0) {
> + /* Voltage base units are mV hence 1.22 mV */
> + *val = 1;
> + *val2 = 220000;
> + } else {
> + /* Voltage base units are mV hence 0.61 mV */
> + *val = 0;
> + *val2 = 610000;
> + }
> + return IIO_VAL_INT_PLUS_MICRO;
> + case IIO_TEMP:
> + *val = -470;
> + *val2 = 0;
> + return IIO_VAL_INT_PLUS_MICRO;
> + case IIO_ACCEL:
> + /*
> + * IIO base unit for sensitivity of accelerometer
> + * is milli g.
> + * 1 LSB represents 0.244 mg.
> + */
> + *val = 0;
> + *val2 = IIO_G_TO_M_S_2(462400);
> + return IIO_VAL_INT_PLUS_NANO;
> + case IIO_INCLI:
> + *val = 0;
> + *val2 = 100000;
> + return IIO_VAL_INT_PLUS_MICRO;
> + default:
> + return -EINVAL;
> + }
> + break;
> + case IIO_CHAN_INFO_OFFSET:
> + /*
> + * The raw ADC value is 1278 when the temperature
> + * is 25 degrees and the scale factor per milli
> + * degree celcius is -470.
> + */
> + *val = 25000 / -470 - 1278;
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_CALIBBIAS:
> + switch (chan->type) {
> + case IIO_ACCEL:
> + bits = 12;
> + break;
> + case IIO_INCLI:
> + bits = 9;
> + break;
> + default:
> + return -EINVAL;
> + }
> + addr = adis16201_addresses[chan->scan_index];
> + ret = adis_read_reg_16(st, addr, &val16);
> + if (ret)
> + return ret;
> +
> + *val = sign_extend32(val16, bits - 1);
> + return IIO_VAL_INT;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int adis16201_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val,
> + int val2,
> + long mask)
> +{
> + struct adis *st = iio_priv(indio_dev);
> + int m;
> +
> + if (mask != IIO_CHAN_INFO_CALIBBIAS)
> + return -EINVAL;
> +
> + switch (chan->type) {
> + case IIO_ACCEL:
> + m = GENMASK(11, 0);
> + break;
> + case IIO_INCLI:
> + m = GENMASK(8, 0);
> + break;
> + default:
> + return -EINVAL;
> + }
Odd bracket positioning here...
I missed this in the patch that change this code have pushed the fixup
back into the earlier patch and will change this here as well.

> +
> + return adis_write_reg_16(st, adis16201_addresses[chan->scan_index],
> + val & m);
> +}
> +
> +static const struct iio_chan_spec adis16201_channels[] = {
> + ADIS_SUPPLY_CHAN(ADIS16201_SUPPLY_OUT_REG, ADIS16201_SCAN_SUPPLY, 0,
> + 12),
> + ADIS_TEMP_CHAN(ADIS16201_TEMP_OUT_REG, ADIS16201_SCAN_TEMP, 0, 12),
> + ADIS_ACCEL_CHAN(X, ADIS16201_XACCL_OUT_REG, ADIS16201_SCAN_ACC_X,
> + BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
> + ADIS_ACCEL_CHAN(Y, ADIS16201_YACCL_OUT_REG, ADIS16201_SCAN_ACC_Y,
> + BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
> + ADIS_AUX_ADC_CHAN(ADIS16201_AUX_ADC_REG, ADIS16201_SCAN_AUX_ADC, 0, 12),
> + ADIS_INCLI_CHAN(X, ADIS16201_XINCL_OUT_REG, ADIS16201_SCAN_INCLI_X,
> + BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
> + ADIS_INCLI_CHAN(X, ADIS16201_YINCL_OUT_REG, ADIS16201_SCAN_INCLI_Y,
> + BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
> + IIO_CHAN_SOFT_TIMESTAMP(7)
> +};
> +
> +static const struct iio_info adis16201_info = {
> + .read_raw = adis16201_read_raw,
> + .write_raw = adis16201_write_raw,
> + .update_scan_mode = adis_update_scan_mode,
> +};
> +
> +static const char * const adis16201_status_error_msgs[] = {
> + [ADIS16201_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
> + [ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT] = "Flash update failed",
> + [ADIS16201_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
> + [ADIS16201_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 3.15V",
> +};
> +
> +static const struct adis_data adis16201_data = {
> + .read_delay = 20,
> + .msc_ctrl_reg = ADIS16201_MSC_CTRL_REG,
> + .glob_cmd_reg = ADIS16201_GLOB_CMD_REG,
> + .diag_stat_reg = ADIS16201_DIAG_STAT_REG,
> +
> + .self_test_mask = ADIS16201_MSC_CTRL_SELF_TEST_EN,
> + .self_test_no_autoclear = true,
> + .startup_delay = ADIS16201_STARTUP_DELAY_MS,
> +
> + .status_error_msgs = adis16201_status_error_msgs,
> + .status_error_mask = BIT(ADIS16201_DIAG_STAT_SPI_FAIL_BIT) |
> + BIT(ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT) |
> + BIT(ADIS16201_DIAG_STAT_POWER_HIGH_BIT) |
> + BIT(ADIS16201_DIAG_STAT_POWER_LOW_BIT),
> +};
> +
> +static int adis16201_probe(struct spi_device *spi)
> +{
> + struct iio_dev *indio_dev;
> + struct adis *st;
> + int ret;
> +
> + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + st = iio_priv(indio_dev);
> + spi_set_drvdata(spi, indio_dev);
> +
> + indio_dev->name = spi->dev.driver->name;
> + indio_dev->dev.parent = &spi->dev;
> + indio_dev->info = &adis16201_info;
> +
> + indio_dev->channels = adis16201_channels;
> + indio_dev->num_channels = ARRAY_SIZE(adis16201_channels);
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + ret = adis_init(st, indio_dev, spi, &adis16201_data);
> + if (ret)
> + return ret;
> +
> + ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL);
> + if (ret)
> + return ret;
> +
> + ret = adis_initial_startup(st);
> + if (ret)
> + goto error_cleanup_buffer_trigger;
> +
> + ret = iio_device_register(indio_dev);
> + if (ret < 0)
This is a bit inconsistent. I'm 99% sure iio_device_register
returns 0 or a negative error so you could match with the if (ret)
calls on the earlier lines...

> + goto error_cleanup_buffer_trigger;
> +
> + return 0;
> +
> +error_cleanup_buffer_trigger:
> + adis_cleanup_buffer_and_trigger(st, indio_dev);
> + return ret;
> +}
> +
> +static int adis16201_remove(struct spi_device *spi)
> +{
> + struct iio_dev *indio_dev = spi_get_drvdata(spi);
> + struct adis *st = iio_priv(indio_dev);
> +
> + iio_device_unregister(indio_dev);
> + adis_cleanup_buffer_and_trigger(st, indio_dev);
> +
> + return 0;
> +}
> +
> +static struct spi_driver adis16201_driver = {
> + .driver = {
> + .name = "adis16201",
> + },
> + .probe = adis16201_probe,
> + .remove = adis16201_remove,
> +};
> +module_spi_driver(adis16201_driver);
> +
> +MODULE_AUTHOR("Barry Song <21cnbao@xxxxxxxxx>");
> +MODULE_DESCRIPTION("Analog Devices ADIS16201 Dual-Axis Digital Inclinometer and Accelerometer");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("spi:adis16201");

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