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linux_dsm_epyc7002/drivers/iio/imu/adis16460.c
Alexandru Ardelean c754a45455 iio: imu: adis16460: check ret val for non-zero vs less-than-zero 
The ADIS library functions return zero on success, and negative values for
error. Positive values aren't returned, but we only care about the success
value (which is zero).

This change is mostly needed so that the compiler won't make any inferences
about some about values being potentially un-initialized. This only
triggers after making some functions inline, because the compiler can
better follow return paths.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2019-11-03 10:22:39 +00:00

490 lines
12 KiB
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// SPDX-License-Identifier: GPL-2.0+
/*
* ADIS16460 IMU driver
*
* Copyright 2019 Analog Devices Inc.
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/iio/iio.h>
#include <linux/iio/imu/adis.h>
#include <linux/debugfs.h>
#define ADIS16460_REG_FLASH_CNT 0x00
#define ADIS16460_REG_DIAG_STAT 0x02
#define ADIS16460_REG_X_GYRO_LOW 0x04
#define ADIS16460_REG_X_GYRO_OUT 0x06
#define ADIS16460_REG_Y_GYRO_LOW 0x08
#define ADIS16460_REG_Y_GYRO_OUT 0x0A
#define ADIS16460_REG_Z_GYRO_LOW 0x0C
#define ADIS16460_REG_Z_GYRO_OUT 0x0E
#define ADIS16460_REG_X_ACCL_LOW 0x10
#define ADIS16460_REG_X_ACCL_OUT 0x12
#define ADIS16460_REG_Y_ACCL_LOW 0x14
#define ADIS16460_REG_Y_ACCL_OUT 0x16
#define ADIS16460_REG_Z_ACCL_LOW 0x18
#define ADIS16460_REG_Z_ACCL_OUT 0x1A
#define ADIS16460_REG_SMPL_CNTR 0x1C
#define ADIS16460_REG_TEMP_OUT 0x1E
#define ADIS16460_REG_X_DELT_ANG 0x24
#define ADIS16460_REG_Y_DELT_ANG 0x26
#define ADIS16460_REG_Z_DELT_ANG 0x28
#define ADIS16460_REG_X_DELT_VEL 0x2A
#define ADIS16460_REG_Y_DELT_VEL 0x2C
#define ADIS16460_REG_Z_DELT_VEL 0x2E
#define ADIS16460_REG_MSC_CTRL 0x32
#define ADIS16460_REG_SYNC_SCAL 0x34
#define ADIS16460_REG_DEC_RATE 0x36
#define ADIS16460_REG_FLTR_CTRL 0x38
#define ADIS16460_REG_GLOB_CMD 0x3E
#define ADIS16460_REG_X_GYRO_OFF 0x40
#define ADIS16460_REG_Y_GYRO_OFF 0x42
#define ADIS16460_REG_Z_GYRO_OFF 0x44
#define ADIS16460_REG_X_ACCL_OFF 0x46
#define ADIS16460_REG_Y_ACCL_OFF 0x48
#define ADIS16460_REG_Z_ACCL_OFF 0x4A
#define ADIS16460_REG_LOT_ID1 0x52
#define ADIS16460_REG_LOT_ID2 0x54
#define ADIS16460_REG_PROD_ID 0x56
#define ADIS16460_REG_SERIAL_NUM 0x58
#define ADIS16460_REG_CAL_SGNTR 0x60
#define ADIS16460_REG_CAL_CRC 0x62
#define ADIS16460_REG_CODE_SGNTR 0x64
#define ADIS16460_REG_CODE_CRC 0x66
struct adis16460_chip_info {
unsigned int num_channels;
const struct iio_chan_spec *channels;
unsigned int gyro_max_val;
unsigned int gyro_max_scale;
unsigned int accel_max_val;
unsigned int accel_max_scale;
};
struct adis16460 {
const struct adis16460_chip_info *chip_info;
struct adis adis;
};
#ifdef CONFIG_DEBUG_FS
static int adis16460_show_serial_number(void *arg, u64 *val)
{
struct adis16460 *adis16460 = arg;
u16 serial;
int ret;
ret = adis_read_reg_16(&adis16460->adis, ADIS16460_REG_SERIAL_NUM,
&serial);
if (ret)
return ret;
*val = serial;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(adis16460_serial_number_fops,
adis16460_show_serial_number, NULL, "0x%.4llx\n");
static int adis16460_show_product_id(void *arg, u64 *val)
{
struct adis16460 *adis16460 = arg;
u16 prod_id;
int ret;
ret = adis_read_reg_16(&adis16460->adis, ADIS16460_REG_PROD_ID,
&prod_id);
if (ret)
return ret;
*val = prod_id;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(adis16460_product_id_fops,
adis16460_show_product_id, NULL, "%llu\n");
static int adis16460_show_flash_count(void *arg, u64 *val)
{
struct adis16460 *adis16460 = arg;
u32 flash_count;
int ret;
ret = adis_read_reg_32(&adis16460->adis, ADIS16460_REG_FLASH_CNT,
&flash_count);
if (ret)
return ret;
*val = flash_count;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(adis16460_flash_count_fops,
adis16460_show_flash_count, NULL, "%lld\n");
static int adis16460_debugfs_init(struct iio_dev *indio_dev)
{
struct adis16460 *adis16460 = iio_priv(indio_dev);
debugfs_create_file("serial_number", 0400, indio_dev->debugfs_dentry,
adis16460, &adis16460_serial_number_fops);
debugfs_create_file("product_id", 0400, indio_dev->debugfs_dentry,
adis16460, &adis16460_product_id_fops);
debugfs_create_file("flash_count", 0400, indio_dev->debugfs_dentry,
adis16460, &adis16460_flash_count_fops);
return 0;
}
#else
static int adis16460_debugfs_init(struct iio_dev *indio_dev)
{
return 0;
}
#endif
static int adis16460_set_freq(struct iio_dev *indio_dev, int val, int val2)
{
struct adis16460 *st = iio_priv(indio_dev);
int t;
t = val * 1000 + val2 / 1000;
if (t <= 0)
return -EINVAL;
t = 2048000 / t;
if (t > 2048)
t = 2048;
if (t != 0)
t--;
return adis_write_reg_16(&st->adis, ADIS16460_REG_DEC_RATE, t);
}
static int adis16460_get_freq(struct iio_dev *indio_dev, int *val, int *val2)
{
struct adis16460 *st = iio_priv(indio_dev);
uint16_t t;
int ret;
unsigned int freq;
ret = adis_read_reg_16(&st->adis, ADIS16460_REG_DEC_RATE, &t);
if (ret)
return ret;
freq = 2048000 / (t + 1);
*val = freq / 1000;
*val2 = (freq % 1000) * 1000;
return IIO_VAL_INT_PLUS_MICRO;
}
static int adis16460_read_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int *val, int *val2, long info)
{
struct adis16460 *st = iio_priv(indio_dev);
switch (info) {
case IIO_CHAN_INFO_RAW:
return adis_single_conversion(indio_dev, chan, 0, val);
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_ANGL_VEL:
*val = st->chip_info->gyro_max_scale;
*val2 = st->chip_info->gyro_max_val;
return IIO_VAL_FRACTIONAL;
case IIO_ACCEL:
*val = st->chip_info->accel_max_scale;
*val2 = st->chip_info->accel_max_val;
return IIO_VAL_FRACTIONAL;
case IIO_TEMP:
*val = 50; /* 50 milli degrees Celsius/LSB */
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_OFFSET:
*val = 500; /* 25 degrees Celsius = 0x0000 */
return IIO_VAL_INT;
case IIO_CHAN_INFO_SAMP_FREQ:
return adis16460_get_freq(indio_dev, val, val2);
default:
return -EINVAL;
}
}
static int adis16460_write_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int val, int val2, long info)
{
switch (info) {
case IIO_CHAN_INFO_SAMP_FREQ:
return adis16460_set_freq(indio_dev, val, val2);
default:
return -EINVAL;
}
}
enum {
ADIS16460_SCAN_GYRO_X,
ADIS16460_SCAN_GYRO_Y,
ADIS16460_SCAN_GYRO_Z,
ADIS16460_SCAN_ACCEL_X,
ADIS16460_SCAN_ACCEL_Y,
ADIS16460_SCAN_ACCEL_Z,
ADIS16460_SCAN_TEMP,
};
#define ADIS16460_MOD_CHANNEL(_type, _mod, _address, _si, _bits) \
{ \
.type = (_type), \
.modified = 1, \
.channel2 = (_mod), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.address = (_address), \
.scan_index = (_si), \
.scan_type = { \
.sign = 's', \
.realbits = (_bits), \
.storagebits = (_bits), \
.endianness = IIO_BE, \
}, \
}
#define ADIS16460_GYRO_CHANNEL(_mod) \
ADIS16460_MOD_CHANNEL(IIO_ANGL_VEL, IIO_MOD_ ## _mod, \
ADIS16460_REG_ ## _mod ## _GYRO_LOW, ADIS16460_SCAN_GYRO_ ## _mod, \
32)
#define ADIS16460_ACCEL_CHANNEL(_mod) \
ADIS16460_MOD_CHANNEL(IIO_ACCEL, IIO_MOD_ ## _mod, \
ADIS16460_REG_ ## _mod ## _ACCL_LOW, ADIS16460_SCAN_ACCEL_ ## _mod, \
32)
#define ADIS16460_TEMP_CHANNEL() { \
.type = IIO_TEMP, \
.indexed = 1, \
.channel = 0, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_OFFSET), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.address = ADIS16460_REG_TEMP_OUT, \
.scan_index = ADIS16460_SCAN_TEMP, \
.scan_type = { \
.sign = 's', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_BE, \
}, \
}
static const struct iio_chan_spec adis16460_channels[] = {
ADIS16460_GYRO_CHANNEL(X),
ADIS16460_GYRO_CHANNEL(Y),
ADIS16460_GYRO_CHANNEL(Z),
ADIS16460_ACCEL_CHANNEL(X),
ADIS16460_ACCEL_CHANNEL(Y),
ADIS16460_ACCEL_CHANNEL(Z),
ADIS16460_TEMP_CHANNEL(),
IIO_CHAN_SOFT_TIMESTAMP(7)
};
static const struct adis16460_chip_info adis16460_chip_info = {
.channels = adis16460_channels,
.num_channels = ARRAY_SIZE(adis16460_channels),
/*
* storing the value in rad/degree and the scale in degree
* gives us the result in rad and better precession than
* storing the scale directly in rad.
*/
.gyro_max_val = IIO_RAD_TO_DEGREE(200 << 16),
.gyro_max_scale = 1,
.accel_max_val = IIO_M_S_2_TO_G(20000 << 16),
.accel_max_scale = 5,
};
static const struct iio_info adis16460_info = {
.read_raw = &adis16460_read_raw,
.write_raw = &adis16460_write_raw,
.update_scan_mode = adis_update_scan_mode,
.debugfs_reg_access = adis_debugfs_reg_access,
};
static int adis16460_enable_irq(struct adis *adis, bool enable)
{
/*
* There is no way to gate the data-ready signal internally inside the
* ADIS16460 :(
*/
if (enable)
enable_irq(adis->spi->irq);
else
disable_irq(adis->spi->irq);
return 0;
}
static int adis16460_initial_setup(struct iio_dev *indio_dev)
{
struct adis16460 *st = iio_priv(indio_dev);
uint16_t prod_id;
unsigned int device_id;
int ret;
adis_reset(&st->adis);
msleep(222);
ret = adis_write_reg_16(&st->adis, ADIS16460_REG_GLOB_CMD, BIT(1));
if (ret)
return ret;
msleep(75);
ret = adis_check_status(&st->adis);
if (ret)
return ret;
ret = adis_read_reg_16(&st->adis, ADIS16460_REG_PROD_ID, &prod_id);
if (ret)
return ret;
ret = sscanf(indio_dev->name, "adis%u\n", &device_id);
if (ret != 1)
return -EINVAL;
if (prod_id != device_id)
dev_warn(&indio_dev->dev, "Device ID(%u) and product ID(%u) do not match.",
device_id, prod_id);
return 0;
}
#define ADIS16460_DIAG_STAT_IN_CLK_OOS 7
#define ADIS16460_DIAG_STAT_FLASH_MEM 6
#define ADIS16460_DIAG_STAT_SELF_TEST 5
#define ADIS16460_DIAG_STAT_OVERRANGE 4
#define ADIS16460_DIAG_STAT_SPI_COMM 3
#define ADIS16460_DIAG_STAT_FLASH_UPT 2
static const char * const adis16460_status_error_msgs[] = {
[ADIS16460_DIAG_STAT_IN_CLK_OOS] = "Input clock out of sync",
[ADIS16460_DIAG_STAT_FLASH_MEM] = "Flash memory failure",
[ADIS16460_DIAG_STAT_SELF_TEST] = "Self test diagnostic failure",
[ADIS16460_DIAG_STAT_OVERRANGE] = "Sensor overrange",
[ADIS16460_DIAG_STAT_SPI_COMM] = "SPI communication failure",
[ADIS16460_DIAG_STAT_FLASH_UPT] = "Flash update failure",
};
static const struct adis_data adis16460_data = {
.diag_stat_reg = ADIS16460_REG_DIAG_STAT,
.glob_cmd_reg = ADIS16460_REG_GLOB_CMD,
.has_paging = false,
.read_delay = 5,
.write_delay = 5,
.cs_change_delay = 16,
.status_error_msgs = adis16460_status_error_msgs,
.status_error_mask = BIT(ADIS16460_DIAG_STAT_IN_CLK_OOS) |
BIT(ADIS16460_DIAG_STAT_FLASH_MEM) |
BIT(ADIS16460_DIAG_STAT_SELF_TEST) |
BIT(ADIS16460_DIAG_STAT_OVERRANGE) |
BIT(ADIS16460_DIAG_STAT_SPI_COMM) |
BIT(ADIS16460_DIAG_STAT_FLASH_UPT),
.enable_irq = adis16460_enable_irq,
};
static int adis16460_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
struct adis16460 *st;
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (indio_dev == NULL)
return -ENOMEM;
spi_set_drvdata(spi, indio_dev);
st = iio_priv(indio_dev);
st->chip_info = &adis16460_chip_info;
indio_dev->dev.parent = &spi->dev;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->channels = st->chip_info->channels;
indio_dev->num_channels = st->chip_info->num_channels;
indio_dev->info = &adis16460_info;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = adis_init(&st->adis, indio_dev, spi, &adis16460_data);
if (ret)
return ret;
ret = adis_setup_buffer_and_trigger(&st->adis, indio_dev, NULL);
if (ret)
return ret;
adis16460_enable_irq(&st->adis, 0);
ret = adis16460_initial_setup(indio_dev);
if (ret)
goto error_cleanup_buffer;
ret = iio_device_register(indio_dev);
if (ret)
goto error_cleanup_buffer;
adis16460_debugfs_init(indio_dev);
return 0;
error_cleanup_buffer:
adis_cleanup_buffer_and_trigger(&st->adis, indio_dev);
return ret;
}
static int adis16460_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct adis16460 *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
adis_cleanup_buffer_and_trigger(&st->adis, indio_dev);
return 0;
}
static const struct spi_device_id adis16460_ids[] = {
{ "adis16460", 0 },
{}
};
MODULE_DEVICE_TABLE(spi, adis16460_ids);
static const struct of_device_id adis16460_of_match[] = {
{ .compatible = "adi,adis16460" },
{}
};
MODULE_DEVICE_TABLE(of, adis16460_of_match);
static struct spi_driver adis16460_driver = {
.driver = {
.name = "adis16460",
.of_match_table = adis16460_of_match,
},
.id_table = adis16460_ids,
.probe = adis16460_probe,
.remove = adis16460_remove,
};
module_spi_driver(adis16460_driver);
MODULE_AUTHOR("Dragos Bogdan <dragos.bogdan@analog.com>");
MODULE_DESCRIPTION("Analog Devices ADIS16460 IMU driver");
MODULE_LICENSE("GPL");
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