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staging: iio: adis16209 driver 

Signed-off-by: Barry Song <Barry.Song@analog.com>
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Barry Song 2010-05-07 15:38:59 +01:00 committed by Greg Kroah-Hartman
parent b155498b18
commit 671ece14bc
6 changed files with 1211 additions and 0 deletions
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9
drivers/staging/iio/accel/Kconfig
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@ -3,6 +3,15 @@
#
comment "Accelerometers"
config ADIS16209
tristate "Analog Devices ADIS16209 Dual-Axis Digital Inclinometer and Accelerometer"
depends on SPI
select IIO_TRIGGER if IIO_RING_BUFFER
select IIO_SW_RING if IIO_RING_BUFFER
help
Say yes here to build support for Analog Devices adis16209 dual-axis digital inclinometer
and accelerometer.
config KXSD9
tristate "Kionix KXSD9 Accelerometer Driver"
depends on SPI

4
drivers/staging/iio/accel/Makefile
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@ -1,6 +1,10 @@
#
# Makefile for industrial I/O accelerometer drivers
#
adis16209-y := adis16209_core.o
adis16209-$(CONFIG_IIO_RING_BUFFER) += adis16209_ring.o adis16209_trigger.o
obj-$(CONFIG_ADIS16209) += adis16209.o
obj-$(CONFIG_KXSD9) += kxsd9.o
lis3l02dq-y := lis3l02dq_core.o

193
drivers/staging/iio/accel/adis16209.h Normal file
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@ -0,0 +1,193 @@
#ifndef SPI_ADIS16209_H_
#define SPI_ADIS16209_H_
#define ADIS16209_STARTUP_DELAY 220 /* ms */
#define ADIS16209_READ_REG(a) a
#define ADIS16209_WRITE_REG(a) ((a) | 0x80)
/* Flash memory write count */
#define ADIS16209_FLASH_CNT 0x00
/* Output, power supply */
#define ADIS16209_SUPPLY_OUT 0x02
/* Output, x-axis accelerometer */
#define ADIS16209_XACCL_OUT 0x04
/* Output, y-axis accelerometer */
#define ADIS16209_YACCL_OUT 0x06
/* Output, auxiliary ADC input */
#define ADIS16209_AUX_ADC 0x08
/* Output, temperature */
#define ADIS16209_TEMP_OUT 0x0A
/* Output, x-axis inclination */
#define ADIS16209_XINCL_OUT 0x0C
/* Output, y-axis inclination */
#define ADIS16209_YINCL_OUT 0x0E
/* Output, +/-180 vertical rotational position */
#define ADIS16209_ROT_OUT 0x10
/* Calibration, x-axis acceleration offset null */
#define ADIS16209_XACCL_NULL 0x12
/* Calibration, y-axis acceleration offset null */
#define ADIS16209_YACCL_NULL 0x14
/* Calibration, x-axis inclination offset null */
#define ADIS16209_XINCL_NULL 0x16
/* Calibration, y-axis inclination offset null */
#define ADIS16209_YINCL_NULL 0x18
/* Calibration, vertical rotation offset null */
#define ADIS16209_ROT_NULL 0x1A
/* Alarm 1 amplitude threshold */
#define ADIS16209_ALM_MAG1 0x20
/* Alarm 2 amplitude threshold */
#define ADIS16209_ALM_MAG2 0x22
/* Alarm 1, sample period */
#define ADIS16209_ALM_SMPL1 0x24
/* Alarm 2, sample period */
#define ADIS16209_ALM_SMPL2 0x26
/* Alarm control */
#define ADIS16209_ALM_CTRL 0x28
/* Auxiliary DAC data */
#define ADIS16209_AUX_DAC 0x30
/* General-purpose digital input/output control */
#define ADIS16209_GPIO_CTRL 0x32
/* Miscellaneous control */
#define ADIS16209_MSC_CTRL 0x34
/* Internal sample period (rate) control */
#define ADIS16209_SMPL_PRD 0x36
/* Operation, filter configuration */
#define ADIS16209_AVG_CNT 0x38
/* Operation, sleep mode control */
#define ADIS16209_SLP_CNT 0x3A
/* Diagnostics, system status register */
#define ADIS16209_DIAG_STAT 0x3C
/* Operation, system command register */
#define ADIS16209_GLOB_CMD 0x3E
#define ADIS16209_OUTPUTS 8
/* MSC_CTRL */
/* Self-test at power-on: 1 = disabled, 0 = enabled */
#define ADIS16209_MSC_CTRL_PWRUP_SELF_TEST (1 << 10)
/* Self-test enable */
#define ADIS16209_MSC_CTRL_SELF_TEST_EN (1 << 8)
/* Data-ready enable: 1 = enabled, 0 = disabled */
#define ADIS16209_MSC_CTRL_DATA_RDY_EN (1 << 2)
/* Data-ready polarity: 1 = active high, 0 = active low */
#define ADIS16209_MSC_CTRL_ACTIVE_HIGH (1 << 1)
/* Data-ready line selection: 1 = DIO2, 0 = DIO1 */
#define ADIS16209_MSC_CTRL_DATA_RDY_DIO2 (1 << 0)
/* DIAG_STAT */
/* Alarm 2 status: 1 = alarm active, 0 = alarm inactive */
#define ADIS16209_DIAG_STAT_ALARM2 (1<<9)
/* Alarm 1 status: 1 = alarm active, 0 = alarm inactive */
#define ADIS16209_DIAG_STAT_ALARM1 (1<<8)
/* Self-test diagnostic error flag: 1 = error condition, 0 = normal operation */
#define ADIS16209_DIAG_STAT_SELFTEST_FAIL (1<<5)
/* SPI communications failure */
#define ADIS16209_DIAG_STAT_SPI_FAIL (1<<3)
/* Flash update failure */
#define ADIS16209_DIAG_STAT_FLASH_UPT (1<<2)
/* Power supply above 3.625 V */
#define ADIS16209_DIAG_STAT_POWER_HIGH (1<<1)
/* Power supply below 3.15 V */
#define ADIS16209_DIAG_STAT_POWER_LOW (1<<0)
/* GLOB_CMD */
#define ADIS16209_GLOB_CMD_SW_RESET (1<<7)
#define ADIS16209_GLOB_CMD_CLEAR_STAT (1<<4)
#define ADIS16209_GLOB_CMD_FACTORY_CAL (1<<1)
#define ADIS16209_MAX_TX 24
#define ADIS16209_MAX_RX 24
#define ADIS16209_ERROR_ACTIVE (1<<14)
/**
* struct adis16209_state - device instance specific data
* @us: actual spi_device
* @work_trigger_to_ring: bh for triggered event handling
* @work_cont_thresh: CLEAN
* @inter: used to check if new interrupt has been triggered
* @last_timestamp: passing timestamp from th to bh of interrupt handler
* @indio_dev: industrial I/O device structure
* @trig: data ready trigger registered with iio
* @tx: transmit buffer
* @rx: recieve buffer
* @buf_lock: mutex to protect tx and rx
**/
struct adis16209_state {
struct spi_device *us;
struct work_struct work_trigger_to_ring;
struct iio_work_cont work_cont_thresh;
s64 last_timestamp;
struct iio_dev *indio_dev;
struct iio_trigger *trig;
u8 *tx;
u8 *rx;
struct mutex buf_lock;
};
int adis16209_set_irq(struct device *dev, bool enable);
#ifdef CONFIG_IIO_RING_BUFFER
enum adis16209_scan {
ADIS16209_SCAN_SUPPLY,
ADIS16209_SCAN_ACC_X,
ADIS16209_SCAN_ACC_Y,
ADIS16209_SCAN_AUX_ADC,
ADIS16209_SCAN_TEMP,
ADIS16209_SCAN_INCLI_X,
ADIS16209_SCAN_INCLI_Y,
ADIS16209_SCAN_ROT,
};
void adis16209_remove_trigger(struct iio_dev *indio_dev);
int adis16209_probe_trigger(struct iio_dev *indio_dev);
ssize_t adis16209_read_data_from_ring(struct device *dev,
struct device_attribute *attr,
char *buf);
int adis16209_configure_ring(struct iio_dev *indio_dev);
void adis16209_unconfigure_ring(struct iio_dev *indio_dev);
int adis16209_initialize_ring(struct iio_ring_buffer *ring);
void adis16209_uninitialize_ring(struct iio_ring_buffer *ring);
#else /* CONFIG_IIO_RING_BUFFER */
static inline void adis16209_remove_trigger(struct iio_dev *indio_dev)
{
}
static inline int adis16209_probe_trigger(struct iio_dev *indio_dev)
{
return 0;
}
static inline ssize_t
adis16209_read_data_from_ring(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return 0;
}
static int adis16209_configure_ring(struct iio_dev *indio_dev)
{
return 0;
}
static inline void adis16209_unconfigure_ring(struct iio_dev *indio_dev)
{
}
static inline int adis16209_initialize_ring(struct iio_ring_buffer *ring)
{
return 0;
}
static inline void adis16209_uninitialize_ring(struct iio_ring_buffer *ring)
{
}
#endif /* CONFIG_IIO_RING_BUFFER */
#endif /* SPI_ADIS16209_H_ */

615
drivers/staging/iio/accel/adis16209_core.c Normal file
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@ -0,0 +1,615 @@
/*
* ADIS16209 Programmable Digital Vibration Sensor driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include "../iio.h"
#include "../sysfs.h"
#include "accel.h"
#include "inclinometer.h"
#include "../gyro/gyro.h"
#include "../adc/adc.h"
#include "adis16209.h"
#define DRIVER_NAME "adis16209"
static int adis16209_check_status(struct device *dev);
/**
* adis16209_spi_write_reg_8() - write single byte to a register
* @dev: device associated with child of actual device (iio_dev or iio_trig)
* @reg_address: the address of the register to be written
* @val: the value to write
**/
static int adis16209_spi_write_reg_8(struct device *dev,
u8 reg_address,
u8 val)
{
int ret;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct adis16209_state *st = iio_dev_get_devdata(indio_dev);
mutex_lock(&st->buf_lock);
st->tx[0] = ADIS16209_WRITE_REG(reg_address);
st->tx[1] = val;
ret = spi_write(st->us, st->tx, 2);
mutex_unlock(&st->buf_lock);
return ret;
}
/**
* adis16209_spi_write_reg_16() - write 2 bytes to a pair of registers
* @dev: device associated with child of actual device (iio_dev or iio_trig)
* @reg_address: the address of the lower of the two registers. Second register
* is assumed to have address one greater.
* @val: value to be written
**/
static int adis16209_spi_write_reg_16(struct device *dev,
u8 lower_reg_address,
u16 value)
{
int ret;
struct spi_message msg;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct adis16209_state *st = iio_dev_get_devdata(indio_dev);
struct spi_transfer xfers[] = {
{
.tx_buf = st->tx,
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
}, {
.tx_buf = st->tx + 2,
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
},
};
mutex_lock(&st->buf_lock);
st->tx[0] = ADIS16209_WRITE_REG(lower_reg_address);
st->tx[1] = value & 0xFF;
st->tx[2] = ADIS16209_WRITE_REG(lower_reg_address + 1);
st->tx[3] = (value >> 8) & 0xFF;
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
spi_message_add_tail(&xfers[1], &msg);
ret = spi_sync(st->us, &msg);
mutex_unlock(&st->buf_lock);
return ret;
}
/**
* adis16209_spi_read_reg_16() - read 2 bytes from a 16-bit register
* @dev: device associated with child of actual device (iio_dev or iio_trig)
* @reg_address: the address of the lower of the two registers. Second register
* is assumed to have address one greater.
* @val: somewhere to pass back the value read
**/
static int adis16209_spi_read_reg_16(struct device *dev,
u8 lower_reg_address,
u16 *val)
{
struct spi_message msg;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct adis16209_state *st = iio_dev_get_devdata(indio_dev);
int ret;
struct spi_transfer xfers[] = {
{
.tx_buf = st->tx,
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
.delay_usecs = 20,
}, {
.rx_buf = st->rx,
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
.delay_usecs = 20,
},
};
mutex_lock(&st->buf_lock);
st->tx[0] = ADIS16209_READ_REG(lower_reg_address);
st->tx[1] = 0;
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
spi_message_add_tail(&xfers[1], &msg);
ret = spi_sync(st->us, &msg);
if (ret) {
dev_err(&st->us->dev,
"problem when reading 16 bit register 0x%02X",
lower_reg_address);
goto error_ret;
}
*val = (st->rx[0] << 8) | st->rx[1];
error_ret:
mutex_unlock(&st->buf_lock);
return ret;
}
static ssize_t adis16209_read_12bit_unsigned(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u16 val = 0;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
ret = adis16209_spi_read_reg_16(dev, this_attr->address, &val);
if (ret)
return ret;
if (val & ADIS16209_ERROR_ACTIVE)
adis16209_check_status(dev);
return sprintf(buf, "%u\n", val & 0x0FFF);
}
static ssize_t adis16209_read_14bit_unsigned(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u16 val = 0;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
ret = adis16209_spi_read_reg_16(dev, this_attr->address, &val);
if (ret)
return ret;
if (val & ADIS16209_ERROR_ACTIVE)
adis16209_check_status(dev);
return sprintf(buf, "%u\n", val & 0x3FFF);
}
static ssize_t adis16209_read_temp(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
ssize_t ret;
u16 val;
/* Take the iio_dev status lock */
mutex_lock(&indio_dev->mlock);
ret = adis16209_spi_read_reg_16(dev, ADIS16209_TEMP_OUT, (u16 *)&val);
if (ret)
goto error_ret;
if (val & ADIS16209_ERROR_ACTIVE)
adis16209_check_status(dev);
val &= 0xFFF;
ret = sprintf(buf, "%d\n", val);
error_ret:
mutex_unlock(&indio_dev->mlock);
return ret;
}
static ssize_t adis16209_read_14bit_signed(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
s16 val = 0;
ssize_t ret;
mutex_lock(&indio_dev->mlock);
ret = adis16209_spi_read_reg_16(dev, this_attr->address, (u16 *)&val);
if (!ret) {
if (val & ADIS16209_ERROR_ACTIVE)
adis16209_check_status(dev);
val = ((s16)(val << 2) >> 2);
ret = sprintf(buf, "%d\n", val);
}
mutex_unlock(&indio_dev->mlock);
return ret;
}
static ssize_t adis16209_write_16bit(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret;
long val;
ret = strict_strtol(buf, 10, &val);
if (ret)
goto error_ret;
ret = adis16209_spi_write_reg_16(dev, this_attr->address, val);
error_ret:
return ret ? ret : len;
}
static int adis16209_reset(struct device *dev)
{
int ret;
ret = adis16209_spi_write_reg_8(dev,
ADIS16209_GLOB_CMD,
ADIS16209_GLOB_CMD_SW_RESET);
if (ret)
dev_err(dev, "problem resetting device");
return ret;
}
static ssize_t adis16209_write_reset(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
if (len < 1)
return -EINVAL;
switch (buf[0]) {
case '1':
case 'y':
case 'Y':
return adis16209_reset(dev);
}
return -EINVAL;
}
int adis16209_set_irq(struct device *dev, bool enable)
{
int ret = 0;
u16 msc;
ret = adis16209_spi_read_reg_16(dev, ADIS16209_MSC_CTRL, &msc);
if (ret)
goto error_ret;
msc |= ADIS16209_MSC_CTRL_ACTIVE_HIGH;
msc &= ~ADIS16209_MSC_CTRL_DATA_RDY_DIO2;
if (enable)
msc |= ADIS16209_MSC_CTRL_DATA_RDY_EN;
else
msc &= ~ADIS16209_MSC_CTRL_DATA_RDY_EN;
ret = adis16209_spi_write_reg_16(dev, ADIS16209_MSC_CTRL, msc);
error_ret:
return ret;
}
static int adis16209_check_status(struct device *dev)
{
u16 status;
int ret;
ret = adis16209_spi_read_reg_16(dev, ADIS16209_DIAG_STAT, &status);
if (ret < 0) {
dev_err(dev, "Reading status failed\n");
goto error_ret;
}
ret = status & 0x1F;
if (status & ADIS16209_DIAG_STAT_SELFTEST_FAIL)
dev_err(dev, "Self test failure\n");
if (status & ADIS16209_DIAG_STAT_SPI_FAIL)
dev_err(dev, "SPI failure\n");
if (status & ADIS16209_DIAG_STAT_FLASH_UPT)
dev_err(dev, "Flash update failed\n");
if (status & ADIS16209_DIAG_STAT_POWER_HIGH)
dev_err(dev, "Power supply above 3.625V\n");
if (status & ADIS16209_DIAG_STAT_POWER_LOW)
dev_err(dev, "Power supply below 3.15V\n");
error_ret:
return ret;
}
static int adis16209_self_test(struct device *dev)
{
int ret;
ret = adis16209_spi_write_reg_16(dev,
ADIS16209_MSC_CTRL,
ADIS16209_MSC_CTRL_SELF_TEST_EN);
if (ret) {
dev_err(dev, "problem starting self test");
goto err_ret;
}
adis16209_check_status(dev);
err_ret:
return ret;
}
static int adis16209_initial_setup(struct adis16209_state *st)
{
int ret;
struct device *dev = &st->indio_dev->dev;
/* Disable IRQ */
ret = adis16209_set_irq(dev, false);
if (ret) {
dev_err(dev, "disable irq failed");
goto err_ret;
}
/* Do self test */
ret = adis16209_self_test(dev);
if (ret) {
dev_err(dev, "self test failure");
goto err_ret;
}
/* Read status register to check the result */
ret = adis16209_check_status(dev);
if (ret) {
adis16209_reset(dev);
dev_err(dev, "device not playing ball -> reset");
msleep(ADIS16209_STARTUP_DELAY);
ret = adis16209_check_status(dev);
if (ret) {
dev_err(dev, "giving up");
goto err_ret;
}
}
printk(KERN_INFO DRIVER_NAME ": at CS%d (irq %d)\n",
st->us->chip_select, st->us->irq);
err_ret:
return ret;
}
static IIO_DEV_ATTR_IN_NAMED_RAW(supply, adis16209_read_14bit_unsigned,
ADIS16209_SUPPLY_OUT);
static IIO_CONST_ATTR(in_supply_scale, "0.30518");
static IIO_DEV_ATTR_IN_RAW(0, adis16209_read_12bit_unsigned,
ADIS16209_AUX_ADC);
static IIO_CONST_ATTR(in0_scale, "0.6105");
static IIO_DEV_ATTR_ACCEL_X(adis16209_read_14bit_signed,
ADIS16209_XACCL_OUT);
static IIO_DEV_ATTR_ACCEL_Y(adis16209_read_14bit_signed,
ADIS16209_YACCL_OUT);
static IIO_DEV_ATTR_ACCEL_X_OFFSET(S_IWUSR | S_IRUGO,
adis16209_read_14bit_signed,
adis16209_write_16bit,
ADIS16209_XACCL_NULL);
static IIO_DEV_ATTR_ACCEL_Y_OFFSET(S_IWUSR | S_IRUGO,
adis16209_read_14bit_signed,
adis16209_write_16bit,
ADIS16209_YACCL_NULL);
static IIO_CONST_ATTR(accel_scale, "0.24414");
static IIO_DEV_ATTR_INCLI_X(adis16209_read_14bit_signed,
ADIS16209_XINCL_OUT);
static IIO_DEV_ATTR_INCLI_Y(adis16209_read_14bit_signed,
ADIS16209_YINCL_OUT);
static IIO_DEV_ATTR_INCLI_X_OFFSET(S_IWUSR | S_IRUGO,
adis16209_read_14bit_signed,
adis16209_write_16bit,
ADIS16209_XACCL_NULL);
static IIO_DEV_ATTR_INCLI_Y_OFFSET(S_IWUSR | S_IRUGO,
adis16209_read_14bit_signed,
adis16209_write_16bit,
ADIS16209_YACCL_NULL);
static IIO_CONST_ATTR(incli_scale, "0.025");
static IIO_DEVICE_ATTR(rot_raw, S_IRUGO, adis16209_read_14bit_signed,
NULL, ADIS16209_ROT_OUT);
static IIO_DEV_ATTR_TEMP(adis16209_read_temp);
static IIO_CONST_ATTR(temp_offset, "25");
static IIO_CONST_ATTR(temp_scale, "-0.47");
static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16209_write_reset, 0);
static IIO_CONST_ATTR(name, "adis16209");
static struct attribute *adis16209_event_attributes[] = {
NULL
};
static struct attribute_group adis16209_event_attribute_group = {
.attrs = adis16209_event_attributes,
};
static struct attribute *adis16209_attributes[] = {
&iio_dev_attr_in_supply_raw.dev_attr.attr,
&iio_const_attr_in_supply_scale.dev_attr.attr,
&iio_dev_attr_temp.dev_attr.attr,
&iio_const_attr_temp_offset.dev_attr.attr,
&iio_const_attr_temp_scale.dev_attr.attr,
&iio_dev_attr_reset.dev_attr.attr,
&iio_const_attr_name.dev_attr.attr,
&iio_dev_attr_in0_raw.dev_attr.attr,
&iio_const_attr_in0_scale.dev_attr.attr,
&iio_dev_attr_accel_x_raw.dev_attr.attr,
&iio_dev_attr_accel_y_raw.dev_attr.attr,
&iio_dev_attr_accel_x_offset.dev_attr.attr,
&iio_dev_attr_accel_y_offset.dev_attr.attr,
&iio_const_attr_accel_scale.dev_attr.attr,
&iio_dev_attr_incli_x_raw.dev_attr.attr,
&iio_dev_attr_incli_y_raw.dev_attr.attr,
&iio_dev_attr_incli_x_offset.dev_attr.attr,
&iio_dev_attr_incli_y_offset.dev_attr.attr,
&iio_const_attr_incli_scale.dev_attr.attr,
&iio_dev_attr_rot_raw.dev_attr.attr,
NULL
};
static const struct attribute_group adis16209_attribute_group = {
.attrs = adis16209_attributes,
};
static int __devinit adis16209_probe(struct spi_device *spi)
{
int ret, regdone = 0;
struct adis16209_state *st = kzalloc(sizeof *st, GFP_KERNEL);
if (!st) {
ret = -ENOMEM;
goto error_ret;
}
/* this is only used for removal purposes */
spi_set_drvdata(spi, st);
/* Allocate the comms buffers */
st->rx = kzalloc(sizeof(*st->rx)*ADIS16209_MAX_RX, GFP_KERNEL);
if (st->rx == NULL) {
ret = -ENOMEM;
goto error_free_st;
}
st->tx = kzalloc(sizeof(*st->tx)*ADIS16209_MAX_TX, GFP_KERNEL);
if (st->tx == NULL) {
ret = -ENOMEM;
goto error_free_rx;
}
st->us = spi;
mutex_init(&st->buf_lock);
/* setup the industrialio driver allocated elements */
st->indio_dev = iio_allocate_device();
if (st->indio_dev == NULL) {
ret = -ENOMEM;
goto error_free_tx;
}
st->indio_dev->dev.parent = &spi->dev;
st->indio_dev->num_interrupt_lines = 1;
st->indio_dev->event_attrs = &adis16209_event_attribute_group;
st->indio_dev->attrs = &adis16209_attribute_group;
st->indio_dev->dev_data = (void *)(st);
st->indio_dev->driver_module = THIS_MODULE;
st->indio_dev->modes = INDIO_DIRECT_MODE;
ret = adis16209_configure_ring(st->indio_dev);
if (ret)
goto error_free_dev;
ret = iio_device_register(st->indio_dev);
if (ret)
goto error_unreg_ring_funcs;
regdone = 1;
ret = adis16209_initialize_ring(st->indio_dev->ring);
if (ret) {
printk(KERN_ERR "failed to initialize the ring\n");
goto error_unreg_ring_funcs;
}
if (spi->irq) {
ret = iio_register_interrupt_line(spi->irq,
st->indio_dev,
0,
IRQF_TRIGGER_RISING,
"adis16209");
if (ret)
goto error_uninitialize_ring;
ret = adis16209_probe_trigger(st->indio_dev);
if (ret)
goto error_unregister_line;
}
/* Get the device into a sane initial state */
ret = adis16209_initial_setup(st);
if (ret)
goto error_remove_trigger;
return 0;
error_remove_trigger:
adis16209_remove_trigger(st->indio_dev);
error_unregister_line:
if (spi->irq)
iio_unregister_interrupt_line(st->indio_dev, 0);
error_uninitialize_ring:
adis16209_uninitialize_ring(st->indio_dev->ring);
error_unreg_ring_funcs:
adis16209_unconfigure_ring(st->indio_dev);
error_free_dev:
if (regdone)
iio_device_unregister(st->indio_dev);
else
iio_free_device(st->indio_dev);
error_free_tx:
kfree(st->tx);
error_free_rx:
kfree(st->rx);
error_free_st:
kfree(st);
error_ret:
return ret;
}
static int adis16209_remove(struct spi_device *spi)
{
struct adis16209_state *st = spi_get_drvdata(spi);
struct iio_dev *indio_dev = st->indio_dev;
flush_scheduled_work();
adis16209_remove_trigger(indio_dev);
if (spi->irq)
iio_unregister_interrupt_line(indio_dev, 0);
adis16209_uninitialize_ring(indio_dev->ring);
iio_device_unregister(indio_dev);
adis16209_unconfigure_ring(indio_dev);
kfree(st->tx);
kfree(st->rx);
kfree(st);
return 0;
}
static struct spi_driver adis16209_driver = {
.driver = {
.name = "adis16209",
.owner = THIS_MODULE,
},
.probe = adis16209_probe,
.remove = __devexit_p(adis16209_remove),
};
static __init int adis16209_init(void)
{
return spi_register_driver(&adis16209_driver);
}
module_init(adis16209_init);
static __exit void adis16209_exit(void)
{
spi_unregister_driver(&adis16209_driver);
}
module_exit(adis16209_exit);
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices ADIS16209 Digital Vibration Sensor driver");
MODULE_LICENSE("GPL v2");

266
drivers/staging/iio/accel/adis16209_ring.c Normal file
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@ -0,0 +1,266 @@
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include "../iio.h"
#include "../sysfs.h"
#include "../ring_sw.h"
#include "accel.h"
#include "../trigger.h"
#include "adis16209.h"
/**
* combine_8_to_16() utility function to munge to u8s into u16
**/
static inline u16 combine_8_to_16(u8 lower, u8 upper)
{
u16 _lower = lower;
u16 _upper = upper;
return _lower | (_upper << 8);
}
static IIO_SCAN_EL_C(supply, ADIS16209_SCAN_SUPPLY, IIO_UNSIGNED(14),
ADIS16209_SUPPLY_OUT, NULL);
static IIO_SCAN_EL_C(accel_x, ADIS16209_SCAN_ACC_X, IIO_SIGNED(14),
ADIS16209_XACCL_OUT, NULL);
static IIO_SCAN_EL_C(accel_y, ADIS16209_SCAN_ACC_Y, IIO_SIGNED(14),
ADIS16209_YACCL_OUT, NULL);
static IIO_SCAN_EL_C(aux_adc, ADIS16209_SCAN_AUX_ADC, IIO_UNSIGNED(12),
ADIS16209_AUX_ADC, NULL);
static IIO_SCAN_EL_C(temp, ADIS16209_SCAN_TEMP, IIO_UNSIGNED(12),
ADIS16209_TEMP_OUT, NULL);
static IIO_SCAN_EL_C(incli_x, ADIS16209_SCAN_INCLI_X, IIO_SIGNED(14),
ADIS16209_XINCL_OUT, NULL);
static IIO_SCAN_EL_C(incli_y, ADIS16209_SCAN_INCLI_Y, IIO_SIGNED(14),
ADIS16209_YINCL_OUT, NULL);
static IIO_SCAN_EL_C(rot, ADIS16209_SCAN_ROT, IIO_SIGNED(14),
ADIS16209_ROT_OUT, NULL);
static IIO_SCAN_EL_TIMESTAMP(8);
static struct attribute *adis16209_scan_el_attrs[] = {
&iio_scan_el_supply.dev_attr.attr,
&iio_scan_el_accel_x.dev_attr.attr,
&iio_scan_el_accel_y.dev_attr.attr,
&iio_scan_el_aux_adc.dev_attr.attr,
&iio_scan_el_temp.dev_attr.attr,
&iio_scan_el_incli_x.dev_attr.attr,
&iio_scan_el_incli_y.dev_attr.attr,
&iio_scan_el_rot.dev_attr.attr,
&iio_scan_el_timestamp.dev_attr.attr,
NULL,
};
static struct attribute_group adis16209_scan_el_group = {
.attrs = adis16209_scan_el_attrs,
.name = "scan_elements",
};
/**
* adis16209_poll_func_th() top half interrupt handler called by trigger
* @private_data: iio_dev
**/
static void adis16209_poll_func_th(struct iio_dev *indio_dev)
{
struct adis16209_state *st = iio_dev_get_devdata(indio_dev);
st->last_timestamp = indio_dev->trig->timestamp;
schedule_work(&st->work_trigger_to_ring);
}
/**
* adis16209_read_ring_data() read data registers which will be placed into ring
* @dev: device associated with child of actual device (iio_dev or iio_trig)
* @rx: somewhere to pass back the value read
**/
static int adis16209_read_ring_data(struct device *dev, u8 *rx)
{
struct spi_message msg;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct adis16209_state *st = iio_dev_get_devdata(indio_dev);
struct spi_transfer xfers[ADIS16209_OUTPUTS + 1];
int ret;
int i;
mutex_lock(&st->buf_lock);
spi_message_init(&msg);
memset(xfers, 0, sizeof(xfers));
for (i = 0; i <= ADIS16209_OUTPUTS; i++) {
xfers[i].bits_per_word = 8;
xfers[i].cs_change = 1;
xfers[i].len = 2;
xfers[i].delay_usecs = 20;
xfers[i].tx_buf = st->tx + 2 * i;
st->tx[2 * i]
= ADIS16209_READ_REG(ADIS16209_SUPPLY_OUT + 2 * i);
st->tx[2 * i + 1] = 0;
if (i >= 1)
xfers[i].rx_buf = rx + 2 * (i - 1);
spi_message_add_tail(&xfers[i], &msg);
}
ret = spi_sync(st->us, &msg);
if (ret)
dev_err(&st->us->dev, "problem when burst reading");
mutex_unlock(&st->buf_lock);
return ret;
}
/* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
* specific to be rolled into the core.
*/
static void adis16209_trigger_bh_to_ring(struct work_struct *work_s)
{
struct adis16209_state *st
= container_of(work_s, struct adis16209_state,
work_trigger_to_ring);
int i = 0;
s16 *data;
size_t datasize = st->indio_dev
->ring->access.get_bpd(st->indio_dev->ring);
data = kmalloc(datasize , GFP_KERNEL);
if (data == NULL) {
dev_err(&st->us->dev, "memory alloc failed in ring bh");
return;
}
if (st->indio_dev->scan_count)
if (adis16209_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
for (; i < st->indio_dev->scan_count; i++) {
data[i] = combine_8_to_16(st->rx[i*2+1],
st->rx[i*2]);
}
/* Guaranteed to be aligned with 8 byte boundary */
if (st->indio_dev->scan_timestamp)
*((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
st->indio_dev->ring->access.store_to(st->indio_dev->ring,
(u8 *)data,
st->last_timestamp);
iio_trigger_notify_done(st->indio_dev->trig);
kfree(data);
return;
}
/* in these circumstances is it better to go with unaligned packing and
* deal with the cost?*/
static int adis16209_data_rdy_ring_preenable(struct iio_dev *indio_dev)
{
size_t size;
dev_dbg(&indio_dev->dev, "%s\n", __func__);
/* Check if there are any scan elements enabled, if not fail*/
if (!(indio_dev->scan_count || indio_dev->scan_timestamp))
return -EINVAL;
if (indio_dev->ring->access.set_bpd) {
if (indio_dev->scan_timestamp)
if (indio_dev->scan_count)
/* Timestamp (aligned to s64) and data */
size = (((indio_dev->scan_count * sizeof(s16))
+ sizeof(s64) - 1)
& ~(sizeof(s64) - 1))
+ sizeof(s64);
else /* Timestamp only */
size = sizeof(s64);
else /* Data only */
size = indio_dev->scan_count*sizeof(s16);
indio_dev->ring->access.set_bpd(indio_dev->ring, size);
}
return 0;
}
static int adis16209_data_rdy_ring_postenable(struct iio_dev *indio_dev)
{
return indio_dev->trig
? iio_trigger_attach_poll_func(indio_dev->trig,
indio_dev->pollfunc)
: 0;
}
static int adis16209_data_rdy_ring_predisable(struct iio_dev *indio_dev)
{
return indio_dev->trig
? iio_trigger_dettach_poll_func(indio_dev->trig,
indio_dev->pollfunc)
: 0;
}
void adis16209_unconfigure_ring(struct iio_dev *indio_dev)
{
kfree(indio_dev->pollfunc);
iio_sw_rb_free(indio_dev->ring);
}
int adis16209_configure_ring(struct iio_dev *indio_dev)
{
int ret = 0;
struct adis16209_state *st = indio_dev->dev_data;
struct iio_ring_buffer *ring;
INIT_WORK(&st->work_trigger_to_ring, adis16209_trigger_bh_to_ring);
/* Set default scan mode */
iio_scan_mask_set(indio_dev, iio_scan_el_supply.number);
iio_scan_mask_set(indio_dev, iio_scan_el_rot.number);
iio_scan_mask_set(indio_dev, iio_scan_el_accel_x.number);
iio_scan_mask_set(indio_dev, iio_scan_el_accel_y.number);
iio_scan_mask_set(indio_dev, iio_scan_el_temp.number);
iio_scan_mask_set(indio_dev, iio_scan_el_aux_adc.number);
iio_scan_mask_set(indio_dev, iio_scan_el_incli_x.number);
iio_scan_mask_set(indio_dev, iio_scan_el_incli_y.number);
indio_dev->scan_timestamp = true;
indio_dev->scan_el_attrs = &adis16209_scan_el_group;
ring = iio_sw_rb_allocate(indio_dev);
if (!ring) {
ret = -ENOMEM;
return ret;
}
indio_dev->ring = ring;
/* Effectively select the ring buffer implementation */
iio_ring_sw_register_funcs(&ring->access);
ring->preenable = &adis16209_data_rdy_ring_preenable;
ring->postenable = &adis16209_data_rdy_ring_postenable;
ring->predisable = &adis16209_data_rdy_ring_predisable;
ring->owner = THIS_MODULE;
indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
if (indio_dev->pollfunc == NULL) {
ret = -ENOMEM;
goto error_iio_sw_rb_free;;
}
indio_dev->pollfunc->poll_func_main = &adis16209_poll_func_th;
indio_dev->pollfunc->private_data = indio_dev;
indio_dev->modes |= INDIO_RING_TRIGGERED;
return 0;
error_iio_sw_rb_free:
iio_sw_rb_free(indio_dev->ring);
return ret;
}
int adis16209_initialize_ring(struct iio_ring_buffer *ring)
{
return iio_ring_buffer_register(ring, 0);
}
void adis16209_uninitialize_ring(struct iio_ring_buffer *ring)
{
iio_ring_buffer_unregister(ring);
}

124
drivers/staging/iio/accel/adis16209_trigger.c Normal file
View File

@ -0,0 +1,124 @@
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/spi/spi.h>
#include "../iio.h"
#include "../sysfs.h"
#include "../trigger.h"
#include "adis16209.h"
/**
* adis16209_data_rdy_trig_poll() the event handler for the data rdy trig
**/
static int adis16209_data_rdy_trig_poll(struct iio_dev *dev_info,
int index,
s64 timestamp,
int no_test)
{
struct adis16209_state *st = iio_dev_get_devdata(dev_info);
struct iio_trigger *trig = st->trig;
trig->timestamp = timestamp;
iio_trigger_poll(trig);
return IRQ_HANDLED;
}
IIO_EVENT_SH(data_rdy_trig, &adis16209_data_rdy_trig_poll);
static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
static struct attribute *adis16209_trigger_attrs[] = {
&dev_attr_name.attr,
NULL,
};
static const struct attribute_group adis16209_trigger_attr_group = {
.attrs = adis16209_trigger_attrs,
};
/**
* adis16209_data_rdy_trigger_set_state() set datardy interrupt state
**/
static int adis16209_data_rdy_trigger_set_state(struct iio_trigger *trig,
bool state)
{
struct adis16209_state *st = trig->private_data;
struct iio_dev *indio_dev = st->indio_dev;
int ret = 0;
dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
ret = adis16209_set_irq(&st->indio_dev->dev, state);
if (state == false) {
iio_remove_event_from_list(&iio_event_data_rdy_trig,
&indio_dev->interrupts[0]
->ev_list);
flush_scheduled_work();
} else {
iio_add_event_to_list(&iio_event_data_rdy_trig,
&indio_dev->interrupts[0]->ev_list);
}
return ret;
}
/**
* adis16209_trig_try_reen() try renabling irq for data rdy trigger
* @trig: the datardy trigger
**/
static int adis16209_trig_try_reen(struct iio_trigger *trig)
{
struct adis16209_state *st = trig->private_data;
enable_irq(st->us->irq);
return 0;
}
int adis16209_probe_trigger(struct iio_dev *indio_dev)
{
int ret;
struct adis16209_state *st = indio_dev->dev_data;
st->trig = iio_allocate_trigger();
st->trig->name = kmalloc(IIO_TRIGGER_NAME_LENGTH, GFP_KERNEL);
if (!st->trig->name) {
ret = -ENOMEM;
goto error_free_trig;
}
snprintf((char *)st->trig->name,
IIO_TRIGGER_NAME_LENGTH,
"adis16209-dev%d", indio_dev->id);
st->trig->dev.parent = &st->us->dev;
st->trig->owner = THIS_MODULE;
st->trig->private_data = st;
st->trig->set_trigger_state = &adis16209_data_rdy_trigger_set_state;
st->trig->try_reenable = &adis16209_trig_try_reen;
st->trig->control_attrs = &adis16209_trigger_attr_group;
ret = iio_trigger_register(st->trig);
/* select default trigger */
indio_dev->trig = st->trig;
if (ret)
goto error_free_trig_name;
return 0;
error_free_trig_name:
kfree(st->trig->name);
error_free_trig:
iio_free_trigger(st->trig);
return ret;
}
void adis16209_remove_trigger(struct iio_dev *indio_dev)
{
struct adis16209_state *state = indio_dev->dev_data;
iio_trigger_unregister(state->trig);
kfree(state->trig->name);
iio_free_trigger(state->trig);
}