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linux/drivers/iio/gyro/adis16260.c
Sachin Kamat 356e9fa4e5 iio: gyro: adis16260: Remove redundant break 
'break' after return is redundant. Remove it.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2013-09-14 11:37:00 +01:00

422 lines
12 KiB
C
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/*
* ADIS16260/ADIS16265 Programmable Digital Gyroscope Sensor Driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.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>
#define ADIS16260_STARTUP_DELAY 220 /* ms */
#define ADIS16260_FLASH_CNT 0x00 /* Flash memory write count */
#define ADIS16260_SUPPLY_OUT 0x02 /* Power supply measurement */
#define ADIS16260_GYRO_OUT 0x04 /* X-axis gyroscope output */
#define ADIS16260_AUX_ADC 0x0A /* analog input channel measurement */
#define ADIS16260_TEMP_OUT 0x0C /* internal temperature measurement */
#define ADIS16260_ANGL_OUT 0x0E /* angle displacement */
#define ADIS16260_GYRO_OFF 0x14 /* Calibration, offset/bias adjustment */
#define ADIS16260_GYRO_SCALE 0x16 /* Calibration, scale adjustment */
#define ADIS16260_ALM_MAG1 0x20 /* Alarm 1 magnitude/polarity setting */
#define ADIS16260_ALM_MAG2 0x22 /* Alarm 2 magnitude/polarity setting */
#define ADIS16260_ALM_SMPL1 0x24 /* Alarm 1 dynamic rate of change setting */
#define ADIS16260_ALM_SMPL2 0x26 /* Alarm 2 dynamic rate of change setting */
#define ADIS16260_ALM_CTRL 0x28 /* Alarm control */
#define ADIS16260_AUX_DAC 0x30 /* Auxiliary DAC data */
#define ADIS16260_GPIO_CTRL 0x32 /* Control, digital I/O line */
#define ADIS16260_MSC_CTRL 0x34 /* Control, data ready, self-test settings */
#define ADIS16260_SMPL_PRD 0x36 /* Control, internal sample rate */
#define ADIS16260_SENS_AVG 0x38 /* Control, dynamic range, filtering */
#define ADIS16260_SLP_CNT 0x3A /* Control, sleep mode initiation */
#define ADIS16260_DIAG_STAT 0x3C /* Diagnostic, error flags */
#define ADIS16260_GLOB_CMD 0x3E /* Control, global commands */
#define ADIS16260_LOT_ID1 0x52 /* Lot Identification Code 1 */
#define ADIS16260_LOT_ID2 0x54 /* Lot Identification Code 2 */
#define ADIS16260_PROD_ID 0x56 /* Product identifier;
* convert to decimal = 16,265/16,260 */
#define ADIS16260_SERIAL_NUM 0x58 /* Serial number */
#define ADIS16260_ERROR_ACTIVE (1<<14)
#define ADIS16260_NEW_DATA (1<<15)
/* MSC_CTRL */
#define ADIS16260_MSC_CTRL_MEM_TEST (1<<11)
/* Internal self-test enable */
#define ADIS16260_MSC_CTRL_INT_SELF_TEST (1<<10)
#define ADIS16260_MSC_CTRL_NEG_SELF_TEST (1<<9)
#define ADIS16260_MSC_CTRL_POS_SELF_TEST (1<<8)
#define ADIS16260_MSC_CTRL_DATA_RDY_EN (1<<2)
#define ADIS16260_MSC_CTRL_DATA_RDY_POL_HIGH (1<<1)
#define ADIS16260_MSC_CTRL_DATA_RDY_DIO2 (1<<0)
/* SMPL_PRD */
/* Time base (tB): 0 = 1.953 ms, 1 = 60.54 ms */
#define ADIS16260_SMPL_PRD_TIME_BASE (1<<7)
#define ADIS16260_SMPL_PRD_DIV_MASK 0x7F
/* SLP_CNT */
#define ADIS16260_SLP_CNT_POWER_OFF 0x80
/* DIAG_STAT */
#define ADIS16260_DIAG_STAT_ALARM2 (1<<9)
#define ADIS16260_DIAG_STAT_ALARM1 (1<<8)
#define ADIS16260_DIAG_STAT_FLASH_CHK_BIT 6
#define ADIS16260_DIAG_STAT_SELF_TEST_BIT 5
#define ADIS16260_DIAG_STAT_OVERFLOW_BIT 4
#define ADIS16260_DIAG_STAT_SPI_FAIL_BIT 3
#define ADIS16260_DIAG_STAT_FLASH_UPT_BIT 2
#define ADIS16260_DIAG_STAT_POWER_HIGH_BIT 1
#define ADIS16260_DIAG_STAT_POWER_LOW_BIT 0
/* GLOB_CMD */
#define ADIS16260_GLOB_CMD_SW_RESET (1<<7)
#define ADIS16260_GLOB_CMD_FLASH_UPD (1<<3)
#define ADIS16260_GLOB_CMD_DAC_LATCH (1<<2)
#define ADIS16260_GLOB_CMD_FAC_CALIB (1<<1)
#define ADIS16260_GLOB_CMD_AUTO_NULL (1<<0)
#define ADIS16260_SPI_SLOW (u32)(300 * 1000)
#define ADIS16260_SPI_BURST (u32)(1000 * 1000)
#define ADIS16260_SPI_FAST (u32)(2000 * 1000)
/* At the moment triggers are only used for ring buffer
* filling. This may change!
*/
#define ADIS16260_SCAN_GYRO 0
#define ADIS16260_SCAN_SUPPLY 1
#define ADIS16260_SCAN_AUX_ADC 2
#define ADIS16260_SCAN_TEMP 3
#define ADIS16260_SCAN_ANGL 4
static ssize_t adis16260_read_frequency(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct adis *adis = iio_priv(indio_dev);
int ret, len = 0;
u16 t;
int sps;
ret = adis_read_reg_16(adis, ADIS16260_SMPL_PRD, &t);
if (ret)
return ret;
if (spi_get_device_id(adis->spi)->driver_data) /* If an adis16251 */
sps = (t & ADIS16260_SMPL_PRD_TIME_BASE) ? 8 : 256;
else
sps = (t & ADIS16260_SMPL_PRD_TIME_BASE) ? 66 : 2048;
sps /= (t & ADIS16260_SMPL_PRD_DIV_MASK) + 1;
len = sprintf(buf, "%d\n", sps);
return len;
}
static ssize_t adis16260_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 adis *adis = iio_priv(indio_dev);
unsigned int val;
int ret;
u8 t;
ret = kstrtouint(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&indio_dev->mlock);
if (spi_get_device_id(adis->spi)->driver_data)
t = 256 / val;
else
t = 2048 / val;
if (t > ADIS16260_SMPL_PRD_DIV_MASK)
t = ADIS16260_SMPL_PRD_DIV_MASK;
else if (t > 0)
t--;
if (t >= 0x0A)
adis->spi->max_speed_hz = ADIS16260_SPI_SLOW;
else
adis->spi->max_speed_hz = ADIS16260_SPI_FAST;
ret = adis_write_reg_8(adis, ADIS16260_SMPL_PRD, t);
mutex_unlock(&indio_dev->mlock);
return ret ? ret : len;
}
/* Power down the device */
static int adis16260_stop_device(struct iio_dev *indio_dev)
{
struct adis *adis = iio_priv(indio_dev);
int ret;
u16 val = ADIS16260_SLP_CNT_POWER_OFF;
ret = adis_write_reg_16(adis, ADIS16260_SLP_CNT, val);
if (ret)
dev_err(&indio_dev->dev, "problem with turning device off: SLP_CNT");
return ret;
}
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
adis16260_read_frequency,
adis16260_write_frequency);
static const struct iio_chan_spec adis16260_channels[] = {
ADIS_GYRO_CHAN(X, ADIS16260_GYRO_OUT, ADIS16260_SCAN_GYRO,
BIT(IIO_CHAN_INFO_CALIBBIAS) |
BIT(IIO_CHAN_INFO_CALIBSCALE), 14),
ADIS_INCLI_CHAN(X, ADIS16260_ANGL_OUT, ADIS16260_SCAN_ANGL, 0, 14),
ADIS_TEMP_CHAN(ADIS16260_TEMP_OUT, ADIS16260_SCAN_TEMP, 12),
ADIS_SUPPLY_CHAN(ADIS16260_SUPPLY_OUT, ADIS16260_SCAN_SUPPLY, 12),
ADIS_AUX_ADC_CHAN(ADIS16260_AUX_ADC, ADIS16260_SCAN_AUX_ADC, 12),
IIO_CHAN_SOFT_TIMESTAMP(5),
};
static const u8 adis16260_addresses[][2] = {
[ADIS16260_SCAN_GYRO] = { ADIS16260_GYRO_OFF, ADIS16260_GYRO_SCALE },
};
static int adis16260_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2,
long mask)
{
struct adis *adis = iio_priv(indio_dev);
int ret;
u8 addr;
s16 val16;
switch (mask) {
case IIO_CHAN_INFO_RAW:
return adis_single_conversion(indio_dev, chan,
ADIS16260_ERROR_ACTIVE, val);
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_ANGL_VEL:
*val = 0;
if (spi_get_device_id(adis->spi)->driver_data) {
/* 0.01832 degree / sec */
*val2 = IIO_DEGREE_TO_RAD(18320);
} else {
/* 0.07326 degree / sec */
*val2 = IIO_DEGREE_TO_RAD(73260);
}
return IIO_VAL_INT_PLUS_MICRO;
case IIO_INCLI:
*val = 0;
*val2 = IIO_DEGREE_TO_RAD(36630);
return IIO_VAL_INT_PLUS_MICRO;
case IIO_VOLTAGE:
if (chan->channel == 0) {
*val = 1;
*val2 = 831500; /* 1.8315 mV */
} else {
*val = 0;
*val2 = 610500; /* 610.5 uV */
}
return IIO_VAL_INT_PLUS_MICRO;
case IIO_TEMP:
*val = 145;
*val2 = 300000; /* 0.1453 C */
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_OFFSET:
*val = 250000 / 1453; /* 25 C = 0x00 */
return IIO_VAL_INT;
case IIO_CHAN_INFO_CALIBBIAS:
addr = adis16260_addresses[chan->scan_index][0];
ret = adis_read_reg_16(adis, addr, &val16);
if (ret)
return ret;
*val = sign_extend32(val16, 11);
return IIO_VAL_INT;
case IIO_CHAN_INFO_CALIBSCALE:
addr = adis16260_addresses[chan->scan_index][1];
ret = adis_read_reg_16(adis, addr, &val16);
if (ret)
return ret;
*val = val16;
return IIO_VAL_INT;
}
return -EINVAL;
}
static int adis16260_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct adis *adis = iio_priv(indio_dev);
u8 addr;
switch (mask) {
case IIO_CHAN_INFO_CALIBBIAS:
if (val < -2048 || val >= 2048)
return -EINVAL;
addr = adis16260_addresses[chan->scan_index][0];
return adis_write_reg_16(adis, addr, val);
case IIO_CHAN_INFO_CALIBSCALE:
if (val < 0 || val >= 4096)
return -EINVAL;
addr = adis16260_addresses[chan->scan_index][1];
return adis_write_reg_16(adis, addr, val);
}
return -EINVAL;
}
static struct attribute *adis16260_attributes[] = {
&iio_dev_attr_sampling_frequency.dev_attr.attr,
NULL
};
static const struct attribute_group adis16260_attribute_group = {
.attrs = adis16260_attributes,
};
static const struct iio_info adis16260_info = {
.attrs = &adis16260_attribute_group,
.read_raw = &adis16260_read_raw,
.write_raw = &adis16260_write_raw,
.update_scan_mode = adis_update_scan_mode,
.driver_module = THIS_MODULE,
};
static const char * const adis1620_status_error_msgs[] = {
[ADIS16260_DIAG_STAT_FLASH_CHK_BIT] = "Flash checksum error",
[ADIS16260_DIAG_STAT_SELF_TEST_BIT] = "Self test error",
[ADIS16260_DIAG_STAT_OVERFLOW_BIT] = "Sensor overrange",
[ADIS16260_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
[ADIS16260_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
[ADIS16260_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 5.25",
[ADIS16260_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 4.75",
};
static const struct adis_data adis16260_data = {
.write_delay = 30,
.read_delay = 30,
.msc_ctrl_reg = ADIS16260_MSC_CTRL,
.glob_cmd_reg = ADIS16260_GLOB_CMD,
.diag_stat_reg = ADIS16260_DIAG_STAT,
.self_test_mask = ADIS16260_MSC_CTRL_MEM_TEST,
.startup_delay = ADIS16260_STARTUP_DELAY,
.status_error_msgs = adis1620_status_error_msgs,
.status_error_mask = BIT(ADIS16260_DIAG_STAT_FLASH_CHK_BIT) |
BIT(ADIS16260_DIAG_STAT_SELF_TEST_BIT) |
BIT(ADIS16260_DIAG_STAT_OVERFLOW_BIT) |
BIT(ADIS16260_DIAG_STAT_SPI_FAIL_BIT) |
BIT(ADIS16260_DIAG_STAT_FLASH_UPT_BIT) |
BIT(ADIS16260_DIAG_STAT_POWER_HIGH_BIT) |
BIT(ADIS16260_DIAG_STAT_POWER_LOW_BIT),
};
static int adis16260_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
struct adis *adis;
int ret;
/* setup the industrialio driver allocated elements */
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adis));
if (!indio_dev)
return -ENOMEM;
adis = iio_priv(indio_dev);
/* this is only used for removal purposes */
spi_set_drvdata(spi, indio_dev);
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->dev.parent = &spi->dev;
indio_dev->info = &adis16260_info;
indio_dev->channels = adis16260_channels;
indio_dev->num_channels = ARRAY_SIZE(adis16260_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
ret = adis_init(adis, indio_dev, spi, &adis16260_data);
if (ret)
return ret;
ret = adis_setup_buffer_and_trigger(adis, indio_dev, NULL);
if (ret)
return ret;
/* Get the device into a sane initial state */
ret = adis_initial_startup(adis);
if (ret)
goto error_cleanup_buffer_trigger;
ret = iio_device_register(indio_dev);
if (ret)
goto error_cleanup_buffer_trigger;
return 0;
error_cleanup_buffer_trigger:
adis_cleanup_buffer_and_trigger(adis, indio_dev);
return ret;
}
static int adis16260_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct adis *adis = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
adis16260_stop_device(indio_dev);
adis_cleanup_buffer_and_trigger(adis, indio_dev);
return 0;
}
/*
* These parts do not need to be differentiated until someone adds
* support for the on chip filtering.
*/
static const struct spi_device_id adis16260_id[] = {
{"adis16260", 0},
{"adis16265", 0},
{"adis16250", 0},
{"adis16255", 0},
{"adis16251", 1},
{}
};
MODULE_DEVICE_TABLE(spi, adis16260_id);
static struct spi_driver adis16260_driver = {
.driver = {
.name = "adis16260",
.owner = THIS_MODULE,
},
.probe = adis16260_probe,
.remove = adis16260_remove,
.id_table = adis16260_id,
};
module_spi_driver(adis16260_driver);
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices ADIS16260/5 Digital Gyroscope Sensor");
MODULE_LICENSE("GPL v2");
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