Revision d1eef1c619749b2a57e514a3fa67d9a516ffa919 authored by Linus Torvalds on 15 December 2019, 23:16:08 UTC, committed by Linus Torvalds on 15 December 2019, 23:16:08 UTC
1 parent 9603e22
adis16136.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* ADIS16133/ADIS16135/ADIS16136 gyroscope driver
*
* Copyright 2012 Analog Devices Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
*/
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/imu/adis.h>
#include <linux/debugfs.h>
#define ADIS16136_REG_FLASH_CNT 0x00
#define ADIS16136_REG_TEMP_OUT 0x02
#define ADIS16136_REG_GYRO_OUT2 0x04
#define ADIS16136_REG_GYRO_OUT 0x06
#define ADIS16136_REG_GYRO_OFF2 0x08
#define ADIS16136_REG_GYRO_OFF 0x0A
#define ADIS16136_REG_ALM_MAG1 0x10
#define ADIS16136_REG_ALM_MAG2 0x12
#define ADIS16136_REG_ALM_SAMPL1 0x14
#define ADIS16136_REG_ALM_SAMPL2 0x16
#define ADIS16136_REG_ALM_CTRL 0x18
#define ADIS16136_REG_GPIO_CTRL 0x1A
#define ADIS16136_REG_MSC_CTRL 0x1C
#define ADIS16136_REG_SMPL_PRD 0x1E
#define ADIS16136_REG_AVG_CNT 0x20
#define ADIS16136_REG_DEC_RATE 0x22
#define ADIS16136_REG_SLP_CTRL 0x24
#define ADIS16136_REG_DIAG_STAT 0x26
#define ADIS16136_REG_GLOB_CMD 0x28
#define ADIS16136_REG_LOT1 0x32
#define ADIS16136_REG_LOT2 0x34
#define ADIS16136_REG_LOT3 0x36
#define ADIS16136_REG_PROD_ID 0x38
#define ADIS16136_REG_SERIAL_NUM 0x3A
#define ADIS16136_DIAG_STAT_FLASH_UPDATE_FAIL 2
#define ADIS16136_DIAG_STAT_SPI_FAIL 3
#define ADIS16136_DIAG_STAT_SELF_TEST_FAIL 5
#define ADIS16136_DIAG_STAT_FLASH_CHKSUM_FAIL 6
#define ADIS16136_MSC_CTRL_MEMORY_TEST BIT(11)
#define ADIS16136_MSC_CTRL_SELF_TEST BIT(10)
struct adis16136_chip_info {
unsigned int precision;
unsigned int fullscale;
};
struct adis16136 {
const struct adis16136_chip_info *chip_info;
struct adis adis;
};
#ifdef CONFIG_DEBUG_FS
static ssize_t adis16136_show_serial(struct file *file,
char __user *userbuf, size_t count, loff_t *ppos)
{
struct adis16136 *adis16136 = file->private_data;
uint16_t lot1, lot2, lot3, serial;
char buf[20];
size_t len;
int ret;
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_SERIAL_NUM,
&serial);
if (ret)
return ret;
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_LOT1, &lot1);
if (ret)
return ret;
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_LOT2, &lot2);
if (ret)
return ret;
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_LOT3, &lot3);
if (ret)
return ret;
len = snprintf(buf, sizeof(buf), "%.4x%.4x%.4x-%.4x\n", lot1, lot2,
lot3, serial);
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
static const struct file_operations adis16136_serial_fops = {
.open = simple_open,
.read = adis16136_show_serial,
.llseek = default_llseek,
.owner = THIS_MODULE,
};
static int adis16136_show_product_id(void *arg, u64 *val)
{
struct adis16136 *adis16136 = arg;
u16 prod_id;
int ret;
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_PROD_ID,
&prod_id);
if (ret)
return ret;
*val = prod_id;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(adis16136_product_id_fops,
adis16136_show_product_id, NULL, "%llu\n");
static int adis16136_show_flash_count(void *arg, u64 *val)
{
struct adis16136 *adis16136 = arg;
uint16_t flash_count;
int ret;
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_FLASH_CNT,
&flash_count);
if (ret)
return ret;
*val = flash_count;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(adis16136_flash_count_fops,
adis16136_show_flash_count, NULL, "%lld\n");
static int adis16136_debugfs_init(struct iio_dev *indio_dev)
{
struct adis16136 *adis16136 = iio_priv(indio_dev);
debugfs_create_file_unsafe("serial_number", 0400,
indio_dev->debugfs_dentry, adis16136,
&adis16136_serial_fops);
debugfs_create_file_unsafe("product_id", 0400,
indio_dev->debugfs_dentry,
adis16136, &adis16136_product_id_fops);
debugfs_create_file_unsafe("flash_count", 0400,
indio_dev->debugfs_dentry,
adis16136, &adis16136_flash_count_fops);
return 0;
}
#else
static int adis16136_debugfs_init(struct iio_dev *indio_dev)
{
return 0;
}
#endif
static int adis16136_set_freq(struct adis16136 *adis16136, unsigned int freq)
{
unsigned int t;
t = 32768 / freq;
if (t < 0xf)
t = 0xf;
else if (t > 0xffff)
t = 0xffff;
else
t--;
return adis_write_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, t);
}
static int adis16136_get_freq(struct adis16136 *adis16136, unsigned int *freq)
{
uint16_t t;
int ret;
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, &t);
if (ret)
return ret;
*freq = 32768 / (t + 1);
return 0;
}
static ssize_t adis16136_write_frequency(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct adis16136 *adis16136 = iio_priv(indio_dev);
unsigned int val;
int ret;
ret = kstrtouint(buf, 10, &val);
if (ret)
return ret;
if (val == 0)
return -EINVAL;
ret = adis16136_set_freq(adis16136, val);
return ret ? ret : len;
}
static ssize_t adis16136_read_frequency(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct adis16136 *adis16136 = iio_priv(indio_dev);
unsigned int freq;
int ret;
ret = adis16136_get_freq(adis16136, &freq);
if (ret)
return ret;
return sprintf(buf, "%d\n", freq);
}
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
adis16136_read_frequency,
adis16136_write_frequency);
static const unsigned adis16136_3db_divisors[] = {
[0] = 2, /* Special case */
[1] = 6,
[2] = 12,
[3] = 25,
[4] = 50,
[5] = 100,
[6] = 200,
[7] = 200, /* Not a valid setting */
};
static int adis16136_set_filter(struct iio_dev *indio_dev, int val)
{
struct adis16136 *adis16136 = iio_priv(indio_dev);
unsigned int freq;
int i, ret;
ret = adis16136_get_freq(adis16136, &freq);
if (ret)
return ret;
for (i = ARRAY_SIZE(adis16136_3db_divisors) - 1; i >= 1; i--) {
if (freq / adis16136_3db_divisors[i] >= val)
break;
}
return adis_write_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, i);
}
static int adis16136_get_filter(struct iio_dev *indio_dev, int *val)
{
struct adis16136 *adis16136 = iio_priv(indio_dev);
unsigned int freq;
uint16_t val16;
int ret;
mutex_lock(&indio_dev->mlock);
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, &val16);
if (ret)
goto err_unlock;
ret = adis16136_get_freq(adis16136, &freq);
if (ret)
goto err_unlock;
*val = freq / adis16136_3db_divisors[val16 & 0x07];
err_unlock:
mutex_unlock(&indio_dev->mlock);
return ret ? ret : IIO_VAL_INT;
}
static int adis16136_read_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int *val, int *val2, long info)
{
struct adis16136 *adis16136 = iio_priv(indio_dev);
uint32_t val32;
int ret;
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 = adis16136->chip_info->precision;
*val2 = (adis16136->chip_info->fullscale << 16);
return IIO_VAL_FRACTIONAL;
case IIO_TEMP:
*val = 10;
*val2 = 697000; /* 0.010697 degree Celsius */
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_CALIBBIAS:
ret = adis_read_reg_32(&adis16136->adis,
ADIS16136_REG_GYRO_OFF2, &val32);
if (ret)
return ret;
*val = sign_extend32(val32, 31);
return IIO_VAL_INT;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
return adis16136_get_filter(indio_dev, val);
default:
return -EINVAL;
}
}
static int adis16136_write_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int val, int val2, long info)
{
struct adis16136 *adis16136 = iio_priv(indio_dev);
switch (info) {
case IIO_CHAN_INFO_CALIBBIAS:
return adis_write_reg_32(&adis16136->adis,
ADIS16136_REG_GYRO_OFF2, val);
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
return adis16136_set_filter(indio_dev, val);
default:
break;
}
return -EINVAL;
}
enum {
ADIS16136_SCAN_GYRO,
ADIS16136_SCAN_TEMP,
};
static const struct iio_chan_spec adis16136_channels[] = {
{
.type = IIO_ANGL_VEL,
.modified = 1,
.channel2 = IIO_MOD_X,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_CALIBBIAS) |
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
.address = ADIS16136_REG_GYRO_OUT2,
.scan_index = ADIS16136_SCAN_GYRO,
.scan_type = {
.sign = 's',
.realbits = 32,
.storagebits = 32,
.endianness = IIO_BE,
},
}, {
.type = IIO_TEMP,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
.address = ADIS16136_REG_TEMP_OUT,
.scan_index = ADIS16136_SCAN_TEMP,
.scan_type = {
.sign = 's',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_BE,
},
},
IIO_CHAN_SOFT_TIMESTAMP(2),
};
static struct attribute *adis16136_attributes[] = {
&iio_dev_attr_sampling_frequency.dev_attr.attr,
NULL
};
static const struct attribute_group adis16136_attribute_group = {
.attrs = adis16136_attributes,
};
static const struct iio_info adis16136_info = {
.attrs = &adis16136_attribute_group,
.read_raw = &adis16136_read_raw,
.write_raw = &adis16136_write_raw,
.update_scan_mode = adis_update_scan_mode,
.debugfs_reg_access = adis_debugfs_reg_access,
};
static int adis16136_stop_device(struct iio_dev *indio_dev)
{
struct adis16136 *adis16136 = iio_priv(indio_dev);
int ret;
ret = adis_write_reg_16(&adis16136->adis, ADIS16136_REG_SLP_CTRL, 0xff);
if (ret)
dev_err(&indio_dev->dev,
"Could not power down device: %d\n", ret);
return ret;
}
static int adis16136_initial_setup(struct iio_dev *indio_dev)
{
struct adis16136 *adis16136 = iio_priv(indio_dev);
unsigned int device_id;
uint16_t prod_id;
int ret;
ret = adis_initial_startup(&adis16136->adis);
if (ret)
return ret;
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_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;
}
static const char * const adis16136_status_error_msgs[] = {
[ADIS16136_DIAG_STAT_FLASH_UPDATE_FAIL] = "Flash update failed",
[ADIS16136_DIAG_STAT_SPI_FAIL] = "SPI failure",
[ADIS16136_DIAG_STAT_SELF_TEST_FAIL] = "Self test error",
[ADIS16136_DIAG_STAT_FLASH_CHKSUM_FAIL] = "Flash checksum error",
};
static const struct adis_data adis16136_data = {
.diag_stat_reg = ADIS16136_REG_DIAG_STAT,
.glob_cmd_reg = ADIS16136_REG_GLOB_CMD,
.msc_ctrl_reg = ADIS16136_REG_MSC_CTRL,
.self_test_mask = ADIS16136_MSC_CTRL_SELF_TEST,
.startup_delay = 80,
.read_delay = 10,
.write_delay = 10,
.status_error_msgs = adis16136_status_error_msgs,
.status_error_mask = BIT(ADIS16136_DIAG_STAT_FLASH_UPDATE_FAIL) |
BIT(ADIS16136_DIAG_STAT_SPI_FAIL) |
BIT(ADIS16136_DIAG_STAT_SELF_TEST_FAIL) |
BIT(ADIS16136_DIAG_STAT_FLASH_CHKSUM_FAIL),
};
enum adis16136_id {
ID_ADIS16133,
ID_ADIS16135,
ID_ADIS16136,
ID_ADIS16137,
};
static const struct adis16136_chip_info adis16136_chip_info[] = {
[ID_ADIS16133] = {
.precision = IIO_DEGREE_TO_RAD(1200),
.fullscale = 24000,
},
[ID_ADIS16135] = {
.precision = IIO_DEGREE_TO_RAD(300),
.fullscale = 24000,
},
[ID_ADIS16136] = {
.precision = IIO_DEGREE_TO_RAD(450),
.fullscale = 24623,
},
[ID_ADIS16137] = {
.precision = IIO_DEGREE_TO_RAD(1000),
.fullscale = 24609,
},
};
static int adis16136_probe(struct spi_device *spi)
{
const struct spi_device_id *id = spi_get_device_id(spi);
struct adis16136 *adis16136;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adis16136));
if (indio_dev == NULL)
return -ENOMEM;
spi_set_drvdata(spi, indio_dev);
adis16136 = iio_priv(indio_dev);
adis16136->chip_info = &adis16136_chip_info[id->driver_data];
indio_dev->dev.parent = &spi->dev;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->channels = adis16136_channels;
indio_dev->num_channels = ARRAY_SIZE(adis16136_channels);
indio_dev->info = &adis16136_info;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = adis_init(&adis16136->adis, indio_dev, spi, &adis16136_data);
if (ret)
return ret;
ret = adis_setup_buffer_and_trigger(&adis16136->adis, indio_dev, NULL);
if (ret)
return ret;
ret = adis16136_initial_setup(indio_dev);
if (ret)
goto error_cleanup_buffer;
ret = iio_device_register(indio_dev);
if (ret)
goto error_stop_device;
adis16136_debugfs_init(indio_dev);
return 0;
error_stop_device:
adis16136_stop_device(indio_dev);
error_cleanup_buffer:
adis_cleanup_buffer_and_trigger(&adis16136->adis, indio_dev);
return ret;
}
static int adis16136_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct adis16136 *adis16136 = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
adis16136_stop_device(indio_dev);
adis_cleanup_buffer_and_trigger(&adis16136->adis, indio_dev);
return 0;
}
static const struct spi_device_id adis16136_ids[] = {
{ "adis16133", ID_ADIS16133 },
{ "adis16135", ID_ADIS16135 },
{ "adis16136", ID_ADIS16136 },
{ "adis16137", ID_ADIS16137 },
{ }
};
MODULE_DEVICE_TABLE(spi, adis16136_ids);
static struct spi_driver adis16136_driver = {
.driver = {
.name = "adis16136",
},
.id_table = adis16136_ids,
.probe = adis16136_probe,
.remove = adis16136_remove,
};
module_spi_driver(adis16136_driver);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("Analog Devices ADIS16133/ADIS16135/ADIS16136 gyroscope driver");
MODULE_LICENSE("GPL v2");
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