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kernel/drivers/iio/imu/adis16480.c

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init repo.
2024-07-22 17:22:30 +08:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* ADIS16480 and similar IMUs driver
*
* Copyright 2012 Analog Devices Inc.
*/
#include <linux/clk.h>
#include <linux/bitfield.h>
#include <linux/of_irq.h>
#include <linux/interrupt.h>
#include <linux/math.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/lcm.h>
#include <linux/swab.h>
#include <linux/crc32.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/imu/adis.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/debugfs.h>
#define ADIS16480_PAGE_SIZE 0x80
#define ADIS16480_REG(page, reg) ((page) * ADIS16480_PAGE_SIZE + (reg))
#define ADIS16480_REG_PAGE_ID 0x00 /* Same address on each page */
#define ADIS16480_REG_SEQ_CNT ADIS16480_REG(0x00, 0x06)
#define ADIS16480_REG_SYS_E_FLA ADIS16480_REG(0x00, 0x08)
#define ADIS16480_REG_DIAG_STS ADIS16480_REG(0x00, 0x0A)
#define ADIS16480_REG_ALM_STS ADIS16480_REG(0x00, 0x0C)
#define ADIS16480_REG_TEMP_OUT ADIS16480_REG(0x00, 0x0E)
#define ADIS16480_REG_X_GYRO_OUT ADIS16480_REG(0x00, 0x10)
#define ADIS16480_REG_Y_GYRO_OUT ADIS16480_REG(0x00, 0x14)
#define ADIS16480_REG_Z_GYRO_OUT ADIS16480_REG(0x00, 0x18)
#define ADIS16480_REG_X_ACCEL_OUT ADIS16480_REG(0x00, 0x1C)
#define ADIS16480_REG_Y_ACCEL_OUT ADIS16480_REG(0x00, 0x20)
#define ADIS16480_REG_Z_ACCEL_OUT ADIS16480_REG(0x00, 0x24)
#define ADIS16480_REG_X_MAGN_OUT ADIS16480_REG(0x00, 0x28)
#define ADIS16480_REG_Y_MAGN_OUT ADIS16480_REG(0x00, 0x2A)
#define ADIS16480_REG_Z_MAGN_OUT ADIS16480_REG(0x00, 0x2C)
#define ADIS16480_REG_BAROM_OUT ADIS16480_REG(0x00, 0x2E)
#define ADIS16480_REG_X_DELTAANG_OUT ADIS16480_REG(0x00, 0x40)
#define ADIS16480_REG_Y_DELTAANG_OUT ADIS16480_REG(0x00, 0x44)
#define ADIS16480_REG_Z_DELTAANG_OUT ADIS16480_REG(0x00, 0x48)
#define ADIS16480_REG_X_DELTAVEL_OUT ADIS16480_REG(0x00, 0x4C)
#define ADIS16480_REG_Y_DELTAVEL_OUT ADIS16480_REG(0x00, 0x50)
#define ADIS16480_REG_Z_DELTAVEL_OUT ADIS16480_REG(0x00, 0x54)
#define ADIS16480_REG_PROD_ID ADIS16480_REG(0x00, 0x7E)
#define ADIS16480_REG_X_GYRO_SCALE ADIS16480_REG(0x02, 0x04)
#define ADIS16480_REG_Y_GYRO_SCALE ADIS16480_REG(0x02, 0x06)
#define ADIS16480_REG_Z_GYRO_SCALE ADIS16480_REG(0x02, 0x08)
#define ADIS16480_REG_X_ACCEL_SCALE ADIS16480_REG(0x02, 0x0A)
#define ADIS16480_REG_Y_ACCEL_SCALE ADIS16480_REG(0x02, 0x0C)
#define ADIS16480_REG_Z_ACCEL_SCALE ADIS16480_REG(0x02, 0x0E)
#define ADIS16480_REG_X_GYRO_BIAS ADIS16480_REG(0x02, 0x10)
#define ADIS16480_REG_Y_GYRO_BIAS ADIS16480_REG(0x02, 0x14)
#define ADIS16480_REG_Z_GYRO_BIAS ADIS16480_REG(0x02, 0x18)
#define ADIS16480_REG_X_ACCEL_BIAS ADIS16480_REG(0x02, 0x1C)
#define ADIS16480_REG_Y_ACCEL_BIAS ADIS16480_REG(0x02, 0x20)
#define ADIS16480_REG_Z_ACCEL_BIAS ADIS16480_REG(0x02, 0x24)
#define ADIS16480_REG_X_HARD_IRON ADIS16480_REG(0x02, 0x28)
#define ADIS16480_REG_Y_HARD_IRON ADIS16480_REG(0x02, 0x2A)
#define ADIS16480_REG_Z_HARD_IRON ADIS16480_REG(0x02, 0x2C)
#define ADIS16480_REG_BAROM_BIAS ADIS16480_REG(0x02, 0x40)
#define ADIS16480_REG_FLASH_CNT ADIS16480_REG(0x02, 0x7C)
#define ADIS16480_REG_GLOB_CMD ADIS16480_REG(0x03, 0x02)
#define ADIS16480_REG_FNCTIO_CTRL ADIS16480_REG(0x03, 0x06)
#define ADIS16480_REG_GPIO_CTRL ADIS16480_REG(0x03, 0x08)
#define ADIS16480_REG_CONFIG ADIS16480_REG(0x03, 0x0A)
#define ADIS16480_REG_DEC_RATE ADIS16480_REG(0x03, 0x0C)
#define ADIS16480_REG_SLP_CNT ADIS16480_REG(0x03, 0x10)
#define ADIS16480_REG_FILTER_BNK0 ADIS16480_REG(0x03, 0x16)
#define ADIS16480_REG_FILTER_BNK1 ADIS16480_REG(0x03, 0x18)
#define ADIS16480_REG_ALM_CNFG0 ADIS16480_REG(0x03, 0x20)
#define ADIS16480_REG_ALM_CNFG1 ADIS16480_REG(0x03, 0x22)
#define ADIS16480_REG_ALM_CNFG2 ADIS16480_REG(0x03, 0x24)
#define ADIS16480_REG_XG_ALM_MAGN ADIS16480_REG(0x03, 0x28)
#define ADIS16480_REG_YG_ALM_MAGN ADIS16480_REG(0x03, 0x2A)
#define ADIS16480_REG_ZG_ALM_MAGN ADIS16480_REG(0x03, 0x2C)
#define ADIS16480_REG_XA_ALM_MAGN ADIS16480_REG(0x03, 0x2E)
#define ADIS16480_REG_YA_ALM_MAGN ADIS16480_REG(0x03, 0x30)
#define ADIS16480_REG_ZA_ALM_MAGN ADIS16480_REG(0x03, 0x32)
#define ADIS16480_REG_XM_ALM_MAGN ADIS16480_REG(0x03, 0x34)
#define ADIS16480_REG_YM_ALM_MAGN ADIS16480_REG(0x03, 0x36)
#define ADIS16480_REG_ZM_ALM_MAGN ADIS16480_REG(0x03, 0x38)
#define ADIS16480_REG_BR_ALM_MAGN ADIS16480_REG(0x03, 0x3A)
#define ADIS16480_REG_FIRM_REV ADIS16480_REG(0x03, 0x78)
#define ADIS16480_REG_FIRM_DM ADIS16480_REG(0x03, 0x7A)
#define ADIS16480_REG_FIRM_Y ADIS16480_REG(0x03, 0x7C)
/*
* External clock scaling in PPS mode.
* Available only for ADIS1649x devices
*/
#define ADIS16495_REG_SYNC_SCALE ADIS16480_REG(0x03, 0x10)
#define ADIS16495_REG_BURST_CMD ADIS16480_REG(0x00, 0x7C)
#define ADIS16495_BURST_ID 0xA5A5
/* total number of segments in burst */
#define ADIS16495_BURST_MAX_DATA 20
/* spi max speed in burst mode */
#define ADIS16495_BURST_MAX_SPEED 6000000
#define ADIS16480_REG_SERIAL_NUM ADIS16480_REG(0x04, 0x20)
/* Each filter coefficent bank spans two pages */
#define ADIS16480_FIR_COEF(page) (x < 60 ? ADIS16480_REG(page, (x) + 8) : \
ADIS16480_REG((page) + 1, (x) - 60 + 8))
#define ADIS16480_FIR_COEF_A(x) ADIS16480_FIR_COEF(0x05, (x))
#define ADIS16480_FIR_COEF_B(x) ADIS16480_FIR_COEF(0x07, (x))
#define ADIS16480_FIR_COEF_C(x) ADIS16480_FIR_COEF(0x09, (x))
#define ADIS16480_FIR_COEF_D(x) ADIS16480_FIR_COEF(0x0B, (x))
/* ADIS16480_REG_FNCTIO_CTRL */
#define ADIS16480_DRDY_SEL_MSK GENMASK(1, 0)
#define ADIS16480_DRDY_SEL(x) FIELD_PREP(ADIS16480_DRDY_SEL_MSK, x)
#define ADIS16480_DRDY_POL_MSK BIT(2)
#define ADIS16480_DRDY_POL(x) FIELD_PREP(ADIS16480_DRDY_POL_MSK, x)
#define ADIS16480_DRDY_EN_MSK BIT(3)
#define ADIS16480_DRDY_EN(x) FIELD_PREP(ADIS16480_DRDY_EN_MSK, x)
#define ADIS16480_SYNC_SEL_MSK GENMASK(5, 4)
#define ADIS16480_SYNC_SEL(x) FIELD_PREP(ADIS16480_SYNC_SEL_MSK, x)
#define ADIS16480_SYNC_EN_MSK BIT(7)
#define ADIS16480_SYNC_EN(x) FIELD_PREP(ADIS16480_SYNC_EN_MSK, x)
#define ADIS16480_SYNC_MODE_MSK BIT(8)
#define ADIS16480_SYNC_MODE(x) FIELD_PREP(ADIS16480_SYNC_MODE_MSK, x)
struct adis16480_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;
unsigned int temp_scale;
unsigned int int_clk;
unsigned int max_dec_rate;
const unsigned int *filter_freqs;
bool has_pps_clk_mode;
bool has_sleep_cnt;
const struct adis_data adis_data;
};
enum adis16480_int_pin {
ADIS16480_PIN_DIO1,
ADIS16480_PIN_DIO2,
ADIS16480_PIN_DIO3,
ADIS16480_PIN_DIO4
};
enum adis16480_clock_mode {
ADIS16480_CLK_SYNC,
ADIS16480_CLK_PPS,
ADIS16480_CLK_INT
};
struct adis16480 {
const struct adis16480_chip_info *chip_info;
struct adis adis;
struct clk *ext_clk;
enum adis16480_clock_mode clk_mode;
unsigned int clk_freq;
/* Alignment needed for the timestamp */
__be16 data[ADIS16495_BURST_MAX_DATA] __aligned(8);
};
static const char * const adis16480_int_pin_names[4] = {
[ADIS16480_PIN_DIO1] = "DIO1",
[ADIS16480_PIN_DIO2] = "DIO2",
[ADIS16480_PIN_DIO3] = "DIO3",
[ADIS16480_PIN_DIO4] = "DIO4",
};
static bool low_rate_allow;
module_param(low_rate_allow, bool, 0444);
MODULE_PARM_DESC(low_rate_allow,
"Allow IMU rates below the minimum advisable when external clk is used in PPS mode (default: N)");
#ifdef CONFIG_DEBUG_FS
static ssize_t adis16480_show_firmware_revision(struct file *file,
char __user *userbuf, size_t count, loff_t *ppos)
{
struct adis16480 *adis16480 = file->private_data;
char buf[7];
size_t len;
u16 rev;
int ret;
ret = adis_read_reg_16(&adis16480->adis, ADIS16480_REG_FIRM_REV, &rev);
if (ret)
return ret;
len = scnprintf(buf, sizeof(buf), "%x.%x\n", rev >> 8, rev & 0xff);
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
static const struct file_operations adis16480_firmware_revision_fops = {
.open = simple_open,
.read = adis16480_show_firmware_revision,
.llseek = default_llseek,
.owner = THIS_MODULE,
};
static ssize_t adis16480_show_firmware_date(struct file *file,
char __user *userbuf, size_t count, loff_t *ppos)
{
struct adis16480 *adis16480 = file->private_data;
u16 md, year;
char buf[12];
size_t len;
int ret;
ret = adis_read_reg_16(&adis16480->adis, ADIS16480_REG_FIRM_Y, &year);
if (ret)
return ret;
ret = adis_read_reg_16(&adis16480->adis, ADIS16480_REG_FIRM_DM, &md);
if (ret)
return ret;
len = snprintf(buf, sizeof(buf), "%.2x-%.2x-%.4x\n",
md >> 8, md & 0xff, year);
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
static const struct file_operations adis16480_firmware_date_fops = {
.open = simple_open,
.read = adis16480_show_firmware_date,
.llseek = default_llseek,
.owner = THIS_MODULE,
};
static int adis16480_show_serial_number(void *arg, u64 *val)
{
struct adis16480 *adis16480 = arg;
u16 serial;
int ret;
ret = adis_read_reg_16(&adis16480->adis, ADIS16480_REG_SERIAL_NUM,
&serial);
if (ret)
return ret;
*val = serial;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(adis16480_serial_number_fops,
adis16480_show_serial_number, NULL, "0x%.4llx\n");
static int adis16480_show_product_id(void *arg, u64 *val)
{
struct adis16480 *adis16480 = arg;
u16 prod_id;
int ret;
ret = adis_read_reg_16(&adis16480->adis, ADIS16480_REG_PROD_ID,
&prod_id);
if (ret)
return ret;
*val = prod_id;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(adis16480_product_id_fops,
adis16480_show_product_id, NULL, "%llu\n");
static int adis16480_show_flash_count(void *arg, u64 *val)
{
struct adis16480 *adis16480 = arg;
u32 flash_count;
int ret;
ret = adis_read_reg_32(&adis16480->adis, ADIS16480_REG_FLASH_CNT,
&flash_count);
if (ret)
return ret;
*val = flash_count;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(adis16480_flash_count_fops,
adis16480_show_flash_count, NULL, "%lld\n");
static int adis16480_debugfs_init(struct iio_dev *indio_dev)
{
struct adis16480 *adis16480 = iio_priv(indio_dev);
struct dentry *d = iio_get_debugfs_dentry(indio_dev);
debugfs_create_file_unsafe("firmware_revision", 0400,
d, adis16480, &adis16480_firmware_revision_fops);
debugfs_create_file_unsafe("firmware_date", 0400,
d, adis16480, &adis16480_firmware_date_fops);
debugfs_create_file_unsafe("serial_number", 0400,
d, adis16480, &adis16480_serial_number_fops);
debugfs_create_file_unsafe("product_id", 0400,
d, adis16480, &adis16480_product_id_fops);
debugfs_create_file_unsafe("flash_count", 0400,
d, adis16480, &adis16480_flash_count_fops);
return 0;
}
#else
static int adis16480_debugfs_init(struct iio_dev *indio_dev)
{
return 0;
}
#endif
static int adis16480_set_freq(struct iio_dev *indio_dev, int val, int val2)
{
struct adis16480 *st = iio_priv(indio_dev);
unsigned int t, sample_rate = st->clk_freq;
int ret;
if (val < 0 || val2 < 0)
return -EINVAL;
t = val * 1000 + val2 / 1000;
if (t == 0)
return -EINVAL;
adis_dev_lock(&st->adis);
/*
* When using PPS mode, the input clock needs to be scaled so that we have an IMU
* sample rate between (optimally) 4000 and 4250. After this, we can use the
* decimation filter to lower the sampling rate in order to get what the user wants.
* Optimally, the user sample rate is a multiple of both the IMU sample rate and
* the input clock. Hence, calculating the sync_scale dynamically gives us better
* chances of achieving a perfect/integer value for DEC_RATE. The math here is:
* 1. lcm of the input clock and the desired output rate.
* 2. get the highest multiple of the previous result lower than the adis max rate.
* 3. The last result becomes the IMU sample rate. Use that to calculate SYNC_SCALE
* and DEC_RATE (to get the user output rate)
*/
if (st->clk_mode == ADIS16480_CLK_PPS) {
unsigned long scaled_rate = lcm(st->clk_freq, t);
int sync_scale;
/*
* If lcm is bigger than the IMU maximum sampling rate there's no perfect
* solution. In this case, we get the highest multiple of the input clock
* lower than the IMU max sample rate.
*/
if (scaled_rate > st->chip_info->int_clk)
scaled_rate = st->chip_info->int_clk / st->clk_freq * st->clk_freq;
else
scaled_rate = st->chip_info->int_clk / scaled_rate * scaled_rate;
/*
* This is not an hard requirement but it's not advised to run the IMU
* with a sample rate lower than 4000Hz due to possible undersampling
* issues. However, there are users that might really want to take the risk.
* Hence, we provide a module parameter for them. If set, we allow sample
* rates lower than 4KHz. By default, we won't allow this and we just roundup
* the rate to the next multiple of the input clock bigger than 4KHz. This
* is done like this as in some cases (when DEC_RATE is 0) might give
* us the closest value to the one desired by the user...
*/
if (scaled_rate < 4000000 && !low_rate_allow)
scaled_rate = roundup(4000000, st->clk_freq);
sync_scale = scaled_rate / st->clk_freq;
ret = __adis_write_reg_16(&st->adis, ADIS16495_REG_SYNC_SCALE, sync_scale);
if (ret)
goto error;
sample_rate = scaled_rate;
}
t = DIV_ROUND_CLOSEST(sample_rate, t);
if (t)
t--;
if (t > st->chip_info->max_dec_rate)
t = st->chip_info->max_dec_rate;
ret = __adis_write_reg_16(&st->adis, ADIS16480_REG_DEC_RATE, t);
error:
adis_dev_unlock(&st->adis);
return ret;
}
static int adis16480_get_freq(struct iio_dev *indio_dev, int *val, int *val2)
{
struct adis16480 *st = iio_priv(indio_dev);
uint16_t t;
int ret;
unsigned int freq, sample_rate = st->clk_freq;
adis_dev_lock(&st->adis);
if (st->clk_mode == ADIS16480_CLK_PPS) {
u16 sync_scale;
ret = __adis_read_reg_16(&st->adis, ADIS16495_REG_SYNC_SCALE, &sync_scale);
if (ret)
goto error;
sample_rate = st->clk_freq * sync_scale;
}
ret = __adis_read_reg_16(&st->adis, ADIS16480_REG_DEC_RATE, &t);
if (ret)
goto error;
adis_dev_unlock(&st->adis);
freq = DIV_ROUND_CLOSEST(sample_rate, (t + 1));
*val = freq / 1000;
*val2 = (freq % 1000) * 1000;
return IIO_VAL_INT_PLUS_MICRO;
error:
adis_dev_unlock(&st->adis);
return ret;
}
enum {
ADIS16480_SCAN_GYRO_X,
ADIS16480_SCAN_GYRO_Y,
ADIS16480_SCAN_GYRO_Z,
ADIS16480_SCAN_ACCEL_X,
ADIS16480_SCAN_ACCEL_Y,
ADIS16480_SCAN_ACCEL_Z,
ADIS16480_SCAN_MAGN_X,
ADIS16480_SCAN_MAGN_Y,
ADIS16480_SCAN_MAGN_Z,
ADIS16480_SCAN_BARO,
ADIS16480_SCAN_TEMP,
};
static const unsigned int adis16480_calibbias_regs[] = {
[ADIS16480_SCAN_GYRO_X] = ADIS16480_REG_X_GYRO_BIAS,
[ADIS16480_SCAN_GYRO_Y] = ADIS16480_REG_Y_GYRO_BIAS,
[ADIS16480_SCAN_GYRO_Z] = ADIS16480_REG_Z_GYRO_BIAS,
[ADIS16480_SCAN_ACCEL_X] = ADIS16480_REG_X_ACCEL_BIAS,
[ADIS16480_SCAN_ACCEL_Y] = ADIS16480_REG_Y_ACCEL_BIAS,
[ADIS16480_SCAN_ACCEL_Z] = ADIS16480_REG_Z_ACCEL_BIAS,
[ADIS16480_SCAN_MAGN_X] = ADIS16480_REG_X_HARD_IRON,
[ADIS16480_SCAN_MAGN_Y] = ADIS16480_REG_Y_HARD_IRON,
[ADIS16480_SCAN_MAGN_Z] = ADIS16480_REG_Z_HARD_IRON,
[ADIS16480_SCAN_BARO] = ADIS16480_REG_BAROM_BIAS,
};
static const unsigned int adis16480_calibscale_regs[] = {
[ADIS16480_SCAN_GYRO_X] = ADIS16480_REG_X_GYRO_SCALE,
[ADIS16480_SCAN_GYRO_Y] = ADIS16480_REG_Y_GYRO_SCALE,
[ADIS16480_SCAN_GYRO_Z] = ADIS16480_REG_Z_GYRO_SCALE,
[ADIS16480_SCAN_ACCEL_X] = ADIS16480_REG_X_ACCEL_SCALE,
[ADIS16480_SCAN_ACCEL_Y] = ADIS16480_REG_Y_ACCEL_SCALE,
[ADIS16480_SCAN_ACCEL_Z] = ADIS16480_REG_Z_ACCEL_SCALE,
};
static int adis16480_set_calibbias(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int bias)
{
unsigned int reg = adis16480_calibbias_regs[chan->scan_index];
struct adis16480 *st = iio_priv(indio_dev);
switch (chan->type) {
case IIO_MAGN:
case IIO_PRESSURE:
if (bias < -0x8000 || bias >= 0x8000)
return -EINVAL;
return adis_write_reg_16(&st->adis, reg, bias);
case IIO_ANGL_VEL:
case IIO_ACCEL:
return adis_write_reg_32(&st->adis, reg, bias);
default:
break;
}
return -EINVAL;
}
static int adis16480_get_calibbias(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int *bias)
{
unsigned int reg = adis16480_calibbias_regs[chan->scan_index];
struct adis16480 *st = iio_priv(indio_dev);
uint16_t val16;
uint32_t val32;
int ret;
switch (chan->type) {
case IIO_MAGN:
case IIO_PRESSURE:
ret = adis_read_reg_16(&st->adis, reg, &val16);
if (ret == 0)
*bias = sign_extend32(val16, 15);
break;
case IIO_ANGL_VEL:
case IIO_ACCEL:
ret = adis_read_reg_32(&st->adis, reg, &val32);
if (ret == 0)
*bias = sign_extend32(val32, 31);
break;
default:
ret = -EINVAL;
}
if (ret)
return ret;
return IIO_VAL_INT;
}
static int adis16480_set_calibscale(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int scale)
{
unsigned int reg = adis16480_calibscale_regs[chan->scan_index];
struct adis16480 *st = iio_priv(indio_dev);
if (scale < -0x8000 || scale >= 0x8000)
return -EINVAL;
return adis_write_reg_16(&st->adis, reg, scale);
}
static int adis16480_get_calibscale(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int *scale)
{
unsigned int reg = adis16480_calibscale_regs[chan->scan_index];
struct adis16480 *st = iio_priv(indio_dev);
uint16_t val16;
int ret;
ret = adis_read_reg_16(&st->adis, reg, &val16);
if (ret)
return ret;
*scale = sign_extend32(val16, 15);
return IIO_VAL_INT;
}
static const unsigned int adis16480_def_filter_freqs[] = {
310,
55,
275,
63,
};
static const unsigned int adis16495_def_filter_freqs[] = {
300,
100,
300,
100,
};
static const unsigned int ad16480_filter_data[][2] = {
[ADIS16480_SCAN_GYRO_X] = { ADIS16480_REG_FILTER_BNK0, 0 },
[ADIS16480_SCAN_GYRO_Y] = { ADIS16480_REG_FILTER_BNK0, 3 },
[ADIS16480_SCAN_GYRO_Z] = { ADIS16480_REG_FILTER_BNK0, 6 },
[ADIS16480_SCAN_ACCEL_X] = { ADIS16480_REG_FILTER_BNK0, 9 },
[ADIS16480_SCAN_ACCEL_Y] = { ADIS16480_REG_FILTER_BNK0, 12 },
[ADIS16480_SCAN_ACCEL_Z] = { ADIS16480_REG_FILTER_BNK1, 0 },
[ADIS16480_SCAN_MAGN_X] = { ADIS16480_REG_FILTER_BNK1, 3 },
[ADIS16480_SCAN_MAGN_Y] = { ADIS16480_REG_FILTER_BNK1, 6 },
[ADIS16480_SCAN_MAGN_Z] = { ADIS16480_REG_FILTER_BNK1, 9 },
};
static int adis16480_get_filter_freq(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int *freq)
{
struct adis16480 *st = iio_priv(indio_dev);
unsigned int enable_mask, offset, reg;
uint16_t val;
int ret;
reg = ad16480_filter_data[chan->scan_index][0];
offset = ad16480_filter_data[chan->scan_index][1];
enable_mask = BIT(offset + 2);
ret = adis_read_reg_16(&st->adis, reg, &val);
if (ret)
return ret;
if (!(val & enable_mask))
*freq = 0;
else
*freq = st->chip_info->filter_freqs[(val >> offset) & 0x3];
return IIO_VAL_INT;
}
static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, unsigned int freq)
{
struct adis16480 *st = iio_priv(indio_dev);
unsigned int enable_mask, offset, reg;
unsigned int diff, best_diff;
unsigned int i, best_freq;
uint16_t val;
int ret;
reg = ad16480_filter_data[chan->scan_index][0];
offset = ad16480_filter_data[chan->scan_index][1];
enable_mask = BIT(offset + 2);
adis_dev_lock(&st->adis);
ret = __adis_read_reg_16(&st->adis, reg, &val);
if (ret)
goto out_unlock;
if (freq == 0) {
val &= ~enable_mask;
} else {
best_freq = 0;
best_diff = st->chip_info->filter_freqs[0];
for (i = 0; i < ARRAY_SIZE(adis16480_def_filter_freqs); i++) {
if (st->chip_info->filter_freqs[i] >= freq) {
diff = st->chip_info->filter_freqs[i] - freq;
if (diff < best_diff) {
best_diff = diff;
best_freq = i;
}
}
}
val &= ~(0x3 << offset);
val |= best_freq << offset;
val |= enable_mask;
}
ret = __adis_write_reg_16(&st->adis, reg, val);
out_unlock:
adis_dev_unlock(&st->adis);
return ret;
}
static int adis16480_read_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int *val, int *val2, long info)
{
struct adis16480 *st = iio_priv(indio_dev);
unsigned int temp;
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_MAGN:
*val = 0;
*val2 = 100; /* 0.0001 gauss */
return IIO_VAL_INT_PLUS_MICRO;
case IIO_TEMP:
/*
* +85 degrees Celsius = temp_max_scale
* +25 degrees Celsius = 0
* LSB, 25 degrees Celsius = 60 / temp_max_scale
*/
*val = st->chip_info->temp_scale / 1000;
*val2 = (st->chip_info->temp_scale % 1000) * 1000;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_PRESSURE:
/*
* max scale is 1310 mbar
* max raw value is 32767 shifted for 32bits
*/
*val = 131; /* 1310mbar = 131 kPa */
*val2 = 32767 << 16;
return IIO_VAL_FRACTIONAL;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_OFFSET:
/* Only the temperature channel has a offset */
temp = 25 * 1000000LL; /* 25 degree Celsius = 0x0000 */
*val = DIV_ROUND_CLOSEST_ULL(temp, st->chip_info->temp_scale);
return IIO_VAL_INT;
case IIO_CHAN_INFO_CALIBBIAS:
return adis16480_get_calibbias(indio_dev, chan, val);
case IIO_CHAN_INFO_CALIBSCALE:
return adis16480_get_calibscale(indio_dev, chan, val);
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
return adis16480_get_filter_freq(indio_dev, chan, val);
case IIO_CHAN_INFO_SAMP_FREQ:
return adis16480_get_freq(indio_dev, val, val2);
default:
return -EINVAL;
}
}
static int adis16480_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_CALIBBIAS:
return adis16480_set_calibbias(indio_dev, chan, val);
case IIO_CHAN_INFO_CALIBSCALE:
return adis16480_set_calibscale(indio_dev, chan, val);
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
return adis16480_set_filter_freq(indio_dev, chan, val);
case IIO_CHAN_INFO_SAMP_FREQ:
return adis16480_set_freq(indio_dev, val, val2);
default:
return -EINVAL;
}
}
#define ADIS16480_MOD_CHANNEL(_type, _mod, _address, _si, _info_sep, _bits) \
{ \
.type = (_type), \
.modified = 1, \
.channel2 = (_mod), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_CALIBBIAS) | \
_info_sep, \
.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 ADIS16480_GYRO_CHANNEL(_mod) \
ADIS16480_MOD_CHANNEL(IIO_ANGL_VEL, IIO_MOD_ ## _mod, \
ADIS16480_REG_ ## _mod ## _GYRO_OUT, ADIS16480_SCAN_GYRO_ ## _mod, \
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) | \
BIT(IIO_CHAN_INFO_CALIBSCALE), \
32)
#define ADIS16480_ACCEL_CHANNEL(_mod) \
ADIS16480_MOD_CHANNEL(IIO_ACCEL, IIO_MOD_ ## _mod, \
ADIS16480_REG_ ## _mod ## _ACCEL_OUT, ADIS16480_SCAN_ACCEL_ ## _mod, \
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) | \
BIT(IIO_CHAN_INFO_CALIBSCALE), \
32)
#define ADIS16480_MAGN_CHANNEL(_mod) \
ADIS16480_MOD_CHANNEL(IIO_MAGN, IIO_MOD_ ## _mod, \
ADIS16480_REG_ ## _mod ## _MAGN_OUT, ADIS16480_SCAN_MAGN_ ## _mod, \
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
16)
#define ADIS16480_PRESSURE_CHANNEL() \
{ \
.type = IIO_PRESSURE, \
.indexed = 1, \
.channel = 0, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_CALIBBIAS) | \
BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.address = ADIS16480_REG_BAROM_OUT, \
.scan_index = ADIS16480_SCAN_BARO, \
.scan_type = { \
.sign = 's', \
.realbits = 32, \
.storagebits = 32, \
.endianness = IIO_BE, \
}, \
}
#define ADIS16480_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 = ADIS16480_REG_TEMP_OUT, \
.scan_index = ADIS16480_SCAN_TEMP, \
.scan_type = { \
.sign = 's', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_BE, \
}, \
}
static const struct iio_chan_spec adis16480_channels[] = {
ADIS16480_GYRO_CHANNEL(X),
ADIS16480_GYRO_CHANNEL(Y),
ADIS16480_GYRO_CHANNEL(Z),
ADIS16480_ACCEL_CHANNEL(X),
ADIS16480_ACCEL_CHANNEL(Y),
ADIS16480_ACCEL_CHANNEL(Z),
ADIS16480_MAGN_CHANNEL(X),
ADIS16480_MAGN_CHANNEL(Y),
ADIS16480_MAGN_CHANNEL(Z),
ADIS16480_PRESSURE_CHANNEL(),
ADIS16480_TEMP_CHANNEL(),
IIO_CHAN_SOFT_TIMESTAMP(11)
};
static const struct iio_chan_spec adis16485_channels[] = {
ADIS16480_GYRO_CHANNEL(X),
ADIS16480_GYRO_CHANNEL(Y),
ADIS16480_GYRO_CHANNEL(Z),
ADIS16480_ACCEL_CHANNEL(X),
ADIS16480_ACCEL_CHANNEL(Y),
ADIS16480_ACCEL_CHANNEL(Z),
ADIS16480_TEMP_CHANNEL(),
IIO_CHAN_SOFT_TIMESTAMP(7)
};
enum adis16480_variant {
ADIS16375,
ADIS16480,
ADIS16485,
ADIS16488,
ADIS16490,
ADIS16495_1,
ADIS16495_2,
ADIS16495_3,
ADIS16497_1,
ADIS16497_2,
ADIS16497_3,
};
#define ADIS16480_DIAG_STAT_XGYRO_FAIL 0
#define ADIS16480_DIAG_STAT_YGYRO_FAIL 1
#define ADIS16480_DIAG_STAT_ZGYRO_FAIL 2
#define ADIS16480_DIAG_STAT_XACCL_FAIL 3
#define ADIS16480_DIAG_STAT_YACCL_FAIL 4
#define ADIS16480_DIAG_STAT_ZACCL_FAIL 5
#define ADIS16480_DIAG_STAT_XMAGN_FAIL 8
#define ADIS16480_DIAG_STAT_YMAGN_FAIL 9
#define ADIS16480_DIAG_STAT_ZMAGN_FAIL 10
#define ADIS16480_DIAG_STAT_BARO_FAIL 11
static const char * const adis16480_status_error_msgs[] = {
[ADIS16480_DIAG_STAT_XGYRO_FAIL] = "X-axis gyroscope self-test failure",
[ADIS16480_DIAG_STAT_YGYRO_FAIL] = "Y-axis gyroscope self-test failure",
[ADIS16480_DIAG_STAT_ZGYRO_FAIL] = "Z-axis gyroscope self-test failure",
[ADIS16480_DIAG_STAT_XACCL_FAIL] = "X-axis accelerometer self-test failure",
[ADIS16480_DIAG_STAT_YACCL_FAIL] = "Y-axis accelerometer self-test failure",
[ADIS16480_DIAG_STAT_ZACCL_FAIL] = "Z-axis accelerometer self-test failure",
[ADIS16480_DIAG_STAT_XMAGN_FAIL] = "X-axis magnetometer self-test failure",
[ADIS16480_DIAG_STAT_YMAGN_FAIL] = "Y-axis magnetometer self-test failure",
[ADIS16480_DIAG_STAT_ZMAGN_FAIL] = "Z-axis magnetometer self-test failure",
[ADIS16480_DIAG_STAT_BARO_FAIL] = "Barometer self-test failure",
};
static int adis16480_enable_irq(struct adis *adis, bool enable);
#define ADIS16480_DATA(_prod_id, _timeouts, _burst_len) \
{ \
.diag_stat_reg = ADIS16480_REG_DIAG_STS, \
.glob_cmd_reg = ADIS16480_REG_GLOB_CMD, \
.prod_id_reg = ADIS16480_REG_PROD_ID, \
.prod_id = (_prod_id), \
.has_paging = true, \
.read_delay = 5, \
.write_delay = 5, \
.self_test_mask = BIT(1), \
.self_test_reg = ADIS16480_REG_GLOB_CMD, \
.status_error_msgs = adis16480_status_error_msgs, \
.status_error_mask = BIT(ADIS16480_DIAG_STAT_XGYRO_FAIL) | \
BIT(ADIS16480_DIAG_STAT_YGYRO_FAIL) | \
BIT(ADIS16480_DIAG_STAT_ZGYRO_FAIL) | \
BIT(ADIS16480_DIAG_STAT_XACCL_FAIL) | \
BIT(ADIS16480_DIAG_STAT_YACCL_FAIL) | \
BIT(ADIS16480_DIAG_STAT_ZACCL_FAIL) | \
BIT(ADIS16480_DIAG_STAT_XMAGN_FAIL) | \
BIT(ADIS16480_DIAG_STAT_YMAGN_FAIL) | \
BIT(ADIS16480_DIAG_STAT_ZMAGN_FAIL) | \
BIT(ADIS16480_DIAG_STAT_BARO_FAIL), \
.enable_irq = adis16480_enable_irq, \
.timeouts = (_timeouts), \
.burst_reg_cmd = ADIS16495_REG_BURST_CMD, \
.burst_len = (_burst_len), \
.burst_max_speed_hz = ADIS16495_BURST_MAX_SPEED \
}
static const struct adis_timeout adis16485_timeouts = {
.reset_ms = 560,
.sw_reset_ms = 120,
.self_test_ms = 12,
};
static const struct adis_timeout adis16480_timeouts = {
.reset_ms = 560,
.sw_reset_ms = 560,
.self_test_ms = 12,
};
static const struct adis_timeout adis16495_timeouts = {
.reset_ms = 170,
.sw_reset_ms = 130,
.self_test_ms = 40,
};
static const struct adis_timeout adis16495_1_timeouts = {
.reset_ms = 250,
.sw_reset_ms = 210,
.self_test_ms = 20,
};
static const struct adis16480_chip_info adis16480_chip_info[] = {
[ADIS16375] = {
.channels = adis16485_channels,
.num_channels = ARRAY_SIZE(adis16485_channels),
/*
* Typically we do IIO_RAD_TO_DEGREE in the denominator, which
* is exactly the same as IIO_DEGREE_TO_RAD in numerator, since
* it gives better approximation. However, in this case we
* cannot do it since it would not fit in a 32bit variable.
*/
.gyro_max_val = 22887 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(300),
.accel_max_val = IIO_M_S_2_TO_G(21973 << 16),
.accel_max_scale = 18,
.temp_scale = 5650, /* 5.65 milli degree Celsius */
.int_clk = 2460000,
.max_dec_rate = 2048,
.has_sleep_cnt = true,
.filter_freqs = adis16480_def_filter_freqs,
.adis_data = ADIS16480_DATA(16375, &adis16485_timeouts, 0),
},
[ADIS16480] = {
.channels = adis16480_channels,
.num_channels = ARRAY_SIZE(adis16480_channels),
.gyro_max_val = 22500 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(450),
.accel_max_val = IIO_M_S_2_TO_G(12500 << 16),
.accel_max_scale = 10,
.temp_scale = 5650, /* 5.65 milli degree Celsius */
.int_clk = 2460000,
.max_dec_rate = 2048,
.has_sleep_cnt = true,
.filter_freqs = adis16480_def_filter_freqs,
.adis_data = ADIS16480_DATA(16480, &adis16480_timeouts, 0),
},
[ADIS16485] = {
.channels = adis16485_channels,
.num_channels = ARRAY_SIZE(adis16485_channels),
.gyro_max_val = 22500 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(450),
.accel_max_val = IIO_M_S_2_TO_G(20000 << 16),
.accel_max_scale = 5,
.temp_scale = 5650, /* 5.65 milli degree Celsius */
.int_clk = 2460000,
.max_dec_rate = 2048,
.has_sleep_cnt = true,
.filter_freqs = adis16480_def_filter_freqs,
.adis_data = ADIS16480_DATA(16485, &adis16485_timeouts, 0),
},
[ADIS16488] = {
.channels = adis16480_channels,
.num_channels = ARRAY_SIZE(adis16480_channels),
.gyro_max_val = 22500 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(450),
.accel_max_val = IIO_M_S_2_TO_G(22500 << 16),
.accel_max_scale = 18,
.temp_scale = 5650, /* 5.65 milli degree Celsius */
.int_clk = 2460000,
.max_dec_rate = 2048,
.has_sleep_cnt = true,
.filter_freqs = adis16480_def_filter_freqs,
.adis_data = ADIS16480_DATA(16488, &adis16485_timeouts, 0),
},
[ADIS16490] = {
.channels = adis16485_channels,
.num_channels = ARRAY_SIZE(adis16485_channels),
.gyro_max_val = 20000 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(100),
.accel_max_val = IIO_M_S_2_TO_G(16000 << 16),
.accel_max_scale = 8,
.temp_scale = 14285, /* 14.285 milli degree Celsius */
.int_clk = 4250000,
.max_dec_rate = 4250,
.filter_freqs = adis16495_def_filter_freqs,
.has_pps_clk_mode = true,
.adis_data = ADIS16480_DATA(16490, &adis16495_timeouts, 0),
},
[ADIS16495_1] = {
.channels = adis16485_channels,
.num_channels = ARRAY_SIZE(adis16485_channels),
.gyro_max_val = 20000 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(125),
.accel_max_val = IIO_M_S_2_TO_G(32000 << 16),
.accel_max_scale = 8,
.temp_scale = 12500, /* 12.5 milli degree Celsius */
.int_clk = 4250000,
.max_dec_rate = 4250,
.filter_freqs = adis16495_def_filter_freqs,
.has_pps_clk_mode = true,
/* 20 elements of 16bits */
.adis_data = ADIS16480_DATA(16495, &adis16495_1_timeouts,
ADIS16495_BURST_MAX_DATA * 2),
},
[ADIS16495_2] = {
.channels = adis16485_channels,
.num_channels = ARRAY_SIZE(adis16485_channels),
.gyro_max_val = 18000 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(450),
.accel_max_val = IIO_M_S_2_TO_G(32000 << 16),
.accel_max_scale = 8,
.temp_scale = 12500, /* 12.5 milli degree Celsius */
.int_clk = 4250000,
.max_dec_rate = 4250,
.filter_freqs = adis16495_def_filter_freqs,
.has_pps_clk_mode = true,
/* 20 elements of 16bits */
.adis_data = ADIS16480_DATA(16495, &adis16495_1_timeouts,
ADIS16495_BURST_MAX_DATA * 2),
},
[ADIS16495_3] = {
.channels = adis16485_channels,
.num_channels = ARRAY_SIZE(adis16485_channels),
.gyro_max_val = 20000 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(2000),
.accel_max_val = IIO_M_S_2_TO_G(32000 << 16),
.accel_max_scale = 8,
.temp_scale = 12500, /* 12.5 milli degree Celsius */
.int_clk = 4250000,
.max_dec_rate = 4250,
.filter_freqs = adis16495_def_filter_freqs,
.has_pps_clk_mode = true,
/* 20 elements of 16bits */
.adis_data = ADIS16480_DATA(16495, &adis16495_1_timeouts,
ADIS16495_BURST_MAX_DATA * 2),
},
[ADIS16497_1] = {
.channels = adis16485_channels,
.num_channels = ARRAY_SIZE(adis16485_channels),
.gyro_max_val = 20000 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(125),
.accel_max_val = IIO_M_S_2_TO_G(32000 << 16),
.accel_max_scale = 40,
.temp_scale = 12500, /* 12.5 milli degree Celsius */
.int_clk = 4250000,
.max_dec_rate = 4250,
.filter_freqs = adis16495_def_filter_freqs,
.has_pps_clk_mode = true,
/* 20 elements of 16bits */
.adis_data = ADIS16480_DATA(16497, &adis16495_1_timeouts,
ADIS16495_BURST_MAX_DATA * 2),
},
[ADIS16497_2] = {
.channels = adis16485_channels,
.num_channels = ARRAY_SIZE(adis16485_channels),
.gyro_max_val = 18000 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(450),
.accel_max_val = IIO_M_S_2_TO_G(32000 << 16),
.accel_max_scale = 40,
.temp_scale = 12500, /* 12.5 milli degree Celsius */
.int_clk = 4250000,
.max_dec_rate = 4250,
.filter_freqs = adis16495_def_filter_freqs,
.has_pps_clk_mode = true,
/* 20 elements of 16bits */
.adis_data = ADIS16480_DATA(16497, &adis16495_1_timeouts,
ADIS16495_BURST_MAX_DATA * 2),
},
[ADIS16497_3] = {
.channels = adis16485_channels,
.num_channels = ARRAY_SIZE(adis16485_channels),
.gyro_max_val = 20000 << 16,
.gyro_max_scale = IIO_DEGREE_TO_RAD(2000),
.accel_max_val = IIO_M_S_2_TO_G(32000 << 16),
.accel_max_scale = 40,
.temp_scale = 12500, /* 12.5 milli degree Celsius */
.int_clk = 4250000,
.max_dec_rate = 4250,
.filter_freqs = adis16495_def_filter_freqs,
.has_pps_clk_mode = true,
/* 20 elements of 16bits */
.adis_data = ADIS16480_DATA(16497, &adis16495_1_timeouts,
ADIS16495_BURST_MAX_DATA * 2),
},
};
static bool adis16480_validate_crc(const u16 *buf, const u8 n_elem, const u32 crc)
{
u32 crc_calc;
u16 crc_buf[15];
int j;
for (j = 0; j < n_elem; j++)
crc_buf[j] = swab16(buf[j]);
crc_calc = crc32(~0, crc_buf, n_elem * 2);
crc_calc ^= ~0;
return (crc == crc_calc);
}
static irqreturn_t adis16480_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct adis16480 *st = iio_priv(indio_dev);
struct adis *adis = &st->adis;
int ret, bit, offset, i = 0;
__be16 *buffer;
u32 crc;
bool valid;
adis_dev_lock(adis);
if (adis->current_page != 0) {
adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID);
adis->tx[1] = 0;
ret = spi_write(adis->spi, adis->tx, 2);
if (ret) {
dev_err(&adis->spi->dev, "Failed to change device page: %d\n", ret);
adis_dev_unlock(adis);
goto irq_done;
}
adis->current_page = 0;
}
ret = spi_sync(adis->spi, &adis->msg);
if (ret) {
dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret);
adis_dev_unlock(adis);
goto irq_done;
}
adis_dev_unlock(adis);
/*
* After making the burst request, the response can have one or two
* 16-bit responses containing the BURST_ID depending on the sclk. If
* clk > 3.6MHz, then we will have two BURST_ID in a row. If clk < 3MHZ,
* we have only one. To manage that variation, we use the transition from the
* BURST_ID to the SYS_E_FLAG register, which will not be equal to 0xA5A5. If
* we not find this variation in the first 4 segments, then the data should
* not be valid.
*/
buffer = adis->buffer;
for (offset = 0; offset < 4; offset++) {
u16 curr = be16_to_cpu(buffer[offset]);
u16 next = be16_to_cpu(buffer[offset + 1]);
if (curr == ADIS16495_BURST_ID && next != ADIS16495_BURST_ID) {
offset++;
break;
}
}
if (offset == 4) {
dev_err(&adis->spi->dev, "Invalid burst data\n");
goto irq_done;
}
crc = be16_to_cpu(buffer[offset + 16]) << 16 | be16_to_cpu(buffer[offset + 15]);
valid = adis16480_validate_crc((u16 *)&buffer[offset], 15, crc);
if (!valid) {
dev_err(&adis->spi->dev, "Invalid crc\n");
goto irq_done;
}
for_each_set_bit(bit, indio_dev->active_scan_mask, indio_dev->masklength) {
/*
* When burst mode is used, temperature is the first data
* channel in the sequence, but the temperature scan index
* is 10.
*/
switch (bit) {
case ADIS16480_SCAN_TEMP:
st->data[i++] = buffer[offset + 1];
break;
case ADIS16480_SCAN_GYRO_X ... ADIS16480_SCAN_ACCEL_Z:
/* The lower register data is sequenced first */
st->data[i++] = buffer[2 * bit + offset + 3];
st->data[i++] = buffer[2 * bit + offset + 2];
break;
}
}
iio_push_to_buffers_with_timestamp(indio_dev, st->data, pf->timestamp);
irq_done:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static const struct iio_info adis16480_info = {
.read_raw = &adis16480_read_raw,
.write_raw = &adis16480_write_raw,
.update_scan_mode = adis_update_scan_mode,
.debugfs_reg_access = adis_debugfs_reg_access,
};
static int adis16480_stop_device(struct iio_dev *indio_dev)
{
struct adis16480 *st = iio_priv(indio_dev);
int ret;
ret = adis_write_reg_16(&st->adis, ADIS16480_REG_SLP_CNT, BIT(9));
if (ret)
dev_err(&indio_dev->dev,
"Could not power down device: %d\n", ret);
return ret;
}
static int adis16480_enable_irq(struct adis *adis, bool enable)
{
uint16_t val;
int ret;
ret = __adis_read_reg_16(adis, ADIS16480_REG_FNCTIO_CTRL, &val);
if (ret)
return ret;
val &= ~ADIS16480_DRDY_EN_MSK;
val |= ADIS16480_DRDY_EN(enable);
return __adis_write_reg_16(adis, ADIS16480_REG_FNCTIO_CTRL, val);
}
static int adis16480_config_irq_pin(struct device_node *of_node,
struct adis16480 *st)
{
struct irq_data *desc;
enum adis16480_int_pin pin;
unsigned int irq_type;
uint16_t val;
int i, irq = 0;
desc = irq_get_irq_data(st->adis.spi->irq);
if (!desc) {
dev_err(&st->adis.spi->dev, "Could not find IRQ %d\n", irq);
return -EINVAL;
}
/* Disable data ready since the default after reset is on */
val = ADIS16480_DRDY_EN(0);
/*
* Get the interrupt from the devicetre by reading the interrupt-names
* property. If it is not specified, use DIO1 pin as default.
* According to the datasheet, the factory default assigns DIO2 as data
* ready signal. However, in the previous versions of the driver, DIO1
* pin was used. So, we should leave it as is since some devices might
* be expecting the interrupt on the wrong physical pin.
*/
pin = ADIS16480_PIN_DIO1;
for (i = 0; i < ARRAY_SIZE(adis16480_int_pin_names); i++) {
irq = of_irq_get_byname(of_node, adis16480_int_pin_names[i]);
if (irq > 0) {
pin = i;
break;
}
}
val |= ADIS16480_DRDY_SEL(pin);
/*
* Get the interrupt line behaviour. The data ready polarity can be
* configured as positive or negative, corresponding to
* IRQ_TYPE_EDGE_RISING or IRQ_TYPE_EDGE_FALLING respectively.
*/
irq_type = irqd_get_trigger_type(desc);
if (irq_type == IRQ_TYPE_EDGE_RISING) { /* Default */
val |= ADIS16480_DRDY_POL(1);
} else if (irq_type == IRQ_TYPE_EDGE_FALLING) {
val |= ADIS16480_DRDY_POL(0);
} else {
dev_err(&st->adis.spi->dev,
"Invalid interrupt type 0x%x specified\n", irq_type);
return -EINVAL;
}
/* Write the data ready configuration to the FNCTIO_CTRL register */
return adis_write_reg_16(&st->adis, ADIS16480_REG_FNCTIO_CTRL, val);
}
static int adis16480_of_get_ext_clk_pin(struct adis16480 *st,
struct device_node *of_node)
{
const char *ext_clk_pin;
enum adis16480_int_pin pin;
int i;
pin = ADIS16480_PIN_DIO2;
if (of_property_read_string(of_node, "adi,ext-clk-pin", &ext_clk_pin))
goto clk_input_not_found;
for (i = 0; i < ARRAY_SIZE(adis16480_int_pin_names); i++) {
if (strcasecmp(ext_clk_pin, adis16480_int_pin_names[i]) == 0)
return i;
}
clk_input_not_found:
dev_info(&st->adis.spi->dev,
"clk input line not specified, using DIO2\n");
return pin;
}
static int adis16480_ext_clk_config(struct adis16480 *st,
struct device_node *of_node,
bool enable)
{
unsigned int mode, mask;
enum adis16480_int_pin pin;
uint16_t val;
int ret;
ret = adis_read_reg_16(&st->adis, ADIS16480_REG_FNCTIO_CTRL, &val);
if (ret)
return ret;
pin = adis16480_of_get_ext_clk_pin(st, of_node);
/*
* Each DIOx pin supports only one function at a time. When a single pin
* has two assignments, the enable bit for a lower priority function
* automatically resets to zero (disabling the lower priority function).
*/
if (pin == ADIS16480_DRDY_SEL(val))
dev_warn(&st->adis.spi->dev,
"DIO%x pin supports only one function at a time\n",
pin + 1);
mode = ADIS16480_SYNC_EN(enable) | ADIS16480_SYNC_SEL(pin);
mask = ADIS16480_SYNC_EN_MSK | ADIS16480_SYNC_SEL_MSK;
/* Only ADIS1649x devices support pps ext clock mode */
if (st->chip_info->has_pps_clk_mode) {
mode |= ADIS16480_SYNC_MODE(st->clk_mode);
mask |= ADIS16480_SYNC_MODE_MSK;
}
val &= ~mask;
val |= mode;
ret = adis_write_reg_16(&st->adis, ADIS16480_REG_FNCTIO_CTRL, val);
if (ret)
return ret;
return clk_prepare_enable(st->ext_clk);
}
static int adis16480_get_ext_clocks(struct adis16480 *st)
{
st->clk_mode = ADIS16480_CLK_INT;
st->ext_clk = devm_clk_get(&st->adis.spi->dev, "sync");
if (!IS_ERR_OR_NULL(st->ext_clk)) {
st->clk_mode = ADIS16480_CLK_SYNC;
return 0;
}
if (PTR_ERR(st->ext_clk) != -ENOENT) {
dev_err(&st->adis.spi->dev, "failed to get ext clk\n");
return PTR_ERR(st->ext_clk);
}
if (st->chip_info->has_pps_clk_mode) {
st->ext_clk = devm_clk_get(&st->adis.spi->dev, "pps");
if (!IS_ERR_OR_NULL(st->ext_clk)) {
st->clk_mode = ADIS16480_CLK_PPS;
return 0;
}
if (PTR_ERR(st->ext_clk) != -ENOENT) {
dev_err(&st->adis.spi->dev, "failed to get ext clk\n");
return PTR_ERR(st->ext_clk);
}
}
return 0;
}
static void adis16480_stop(void *data)
{
adis16480_stop_device(data);
}
static void adis16480_clk_disable(void *data)
{
clk_disable_unprepare(data);
}
static int adis16480_probe(struct spi_device *spi)
{
const struct spi_device_id *id = spi_get_device_id(spi);
const struct adis_data *adis16480_data;
irq_handler_t trigger_handler = NULL;
struct iio_dev *indio_dev;
struct adis16480 *st;
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (indio_dev == NULL)
return -ENOMEM;
st = iio_priv(indio_dev);
st->chip_info = &adis16480_chip_info[id->driver_data];
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 = &adis16480_info;
indio_dev->modes = INDIO_DIRECT_MODE;
adis16480_data = &st->chip_info->adis_data;
ret = adis_init(&st->adis, indio_dev, spi, adis16480_data);
if (ret)
return ret;
ret = __adis_initial_startup(&st->adis);
if (ret)
return ret;
if (st->chip_info->has_sleep_cnt) {
ret = devm_add_action_or_reset(&spi->dev, adis16480_stop,
indio_dev);
if (ret)
return ret;
}
ret = adis16480_config_irq_pin(spi->dev.of_node, st);
if (ret)
return ret;
ret = adis16480_get_ext_clocks(st);
if (ret)
return ret;
if (!IS_ERR_OR_NULL(st->ext_clk)) {
ret = adis16480_ext_clk_config(st, spi->dev.of_node, true);
if (ret)
return ret;
ret = devm_add_action_or_reset(&spi->dev, adis16480_clk_disable, st->ext_clk);
if (ret)
return ret;
st->clk_freq = clk_get_rate(st->ext_clk);
st->clk_freq *= 1000; /* micro */
if (st->clk_mode == ADIS16480_CLK_PPS) {
u16 sync_scale;
/*
* In PPS mode, the IMU sample rate is the clk_freq * sync_scale. Hence,
* default the IMU sample rate to the highest multiple of the input clock
* lower than the IMU max sample rate. The internal sample rate is the
* max...
*/
sync_scale = st->chip_info->int_clk / st->clk_freq;
ret = __adis_write_reg_16(&st->adis, ADIS16495_REG_SYNC_SCALE, sync_scale);
if (ret)
return ret;
}
} else {
st->clk_freq = st->chip_info->int_clk;
}
/* Only use our trigger handler if burst mode is supported */
if (adis16480_data->burst_len)
trigger_handler = adis16480_trigger_handler;
ret = devm_adis_setup_buffer_and_trigger(&st->adis, indio_dev,
trigger_handler);
if (ret)
return ret;
ret = devm_iio_device_register(&spi->dev, indio_dev);
if (ret)
return ret;
adis16480_debugfs_init(indio_dev);
return 0;
}
static const struct spi_device_id adis16480_ids[] = {
{ "adis16375", ADIS16375 },
{ "adis16480", ADIS16480 },
{ "adis16485", ADIS16485 },
{ "adis16488", ADIS16488 },
{ "adis16490", ADIS16490 },
{ "adis16495-1", ADIS16495_1 },
{ "adis16495-2", ADIS16495_2 },
{ "adis16495-3", ADIS16495_3 },
{ "adis16497-1", ADIS16497_1 },
{ "adis16497-2", ADIS16497_2 },
{ "adis16497-3", ADIS16497_3 },
{ }
};
MODULE_DEVICE_TABLE(spi, adis16480_ids);
static const struct of_device_id adis16480_of_match[] = {
{ .compatible = "adi,adis16375" },
{ .compatible = "adi,adis16480" },
{ .compatible = "adi,adis16485" },
{ .compatible = "adi,adis16488" },
{ .compatible = "adi,adis16490" },
{ .compatible = "adi,adis16495-1" },
{ .compatible = "adi,adis16495-2" },
{ .compatible = "adi,adis16495-3" },
{ .compatible = "adi,adis16497-1" },
{ .compatible = "adi,adis16497-2" },
{ .compatible = "adi,adis16497-3" },
{ },
};
MODULE_DEVICE_TABLE(of, adis16480_of_match);
static struct spi_driver adis16480_driver = {
.driver = {
.name = "adis16480",
.of_match_table = adis16480_of_match,
},
.id_table = adis16480_ids,
.probe = adis16480_probe,
};
module_spi_driver(adis16480_driver);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("Analog Devices ADIS16480 IMU driver");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(IIO_ADISLIB);
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