kernel_optimize_test/drivers/iio/accel/bmc150-accel-core.c
Jonathan Cameron a6f86f7243 iio:accel:bmc150-accel: Fix timestamp alignment and prevent data leak.
One of a class of bugs pointed out by Lars in a recent review.
iio_push_to_buffers_with_timestamp assumes the buffer used is aligned
to the size of the timestamp (8 bytes).  This is not guaranteed in
this driver which uses a 16 byte array of smaller elements on the stack.
As Lars also noted this anti pattern can involve a leak of data to
userspace and that indeed can happen here.  We close both issues by moving
to a suitable structure in the iio_priv() data with alignment
ensured by use of an explicit c structure.  This data is allocated
with kzalloc so no data can leak appart from previous readings.

Fixes tag is beyond some major refactoring so likely manual backporting
would be needed to get that far back.

Whilst the force alignment of the ts is not strictly necessary, it
does make the code less fragile.

Fixes: 3bbec97733 ("iio: bmc150_accel: add support for hardware fifo")
Reported-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: <Stable@vger.kernel.org>
2020-08-22 11:38:51 +01:00

1763 lines
44 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* 3-axis accelerometer driver supporting following Bosch-Sensortec chips:
* - BMC150
* - BMI055
* - BMA255
* - BMA250E
* - BMA222E
* - BMA280
*
* Copyright (c) 2014, Intel Corporation.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/events.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/regmap.h>
#include "bmc150-accel.h"
#define BMC150_ACCEL_DRV_NAME "bmc150_accel"
#define BMC150_ACCEL_IRQ_NAME "bmc150_accel_event"
#define BMC150_ACCEL_REG_CHIP_ID 0x00
#define BMC150_ACCEL_REG_INT_STATUS_2 0x0B
#define BMC150_ACCEL_ANY_MOTION_MASK 0x07
#define BMC150_ACCEL_ANY_MOTION_BIT_X BIT(0)
#define BMC150_ACCEL_ANY_MOTION_BIT_Y BIT(1)
#define BMC150_ACCEL_ANY_MOTION_BIT_Z BIT(2)
#define BMC150_ACCEL_ANY_MOTION_BIT_SIGN BIT(3)
#define BMC150_ACCEL_REG_PMU_LPW 0x11
#define BMC150_ACCEL_PMU_MODE_MASK 0xE0
#define BMC150_ACCEL_PMU_MODE_SHIFT 5
#define BMC150_ACCEL_PMU_BIT_SLEEP_DUR_MASK 0x17
#define BMC150_ACCEL_PMU_BIT_SLEEP_DUR_SHIFT 1
#define BMC150_ACCEL_REG_PMU_RANGE 0x0F
#define BMC150_ACCEL_DEF_RANGE_2G 0x03
#define BMC150_ACCEL_DEF_RANGE_4G 0x05
#define BMC150_ACCEL_DEF_RANGE_8G 0x08
#define BMC150_ACCEL_DEF_RANGE_16G 0x0C
/* Default BW: 125Hz */
#define BMC150_ACCEL_REG_PMU_BW 0x10
#define BMC150_ACCEL_DEF_BW 125
#define BMC150_ACCEL_REG_RESET 0x14
#define BMC150_ACCEL_RESET_VAL 0xB6
#define BMC150_ACCEL_REG_INT_MAP_0 0x19
#define BMC150_ACCEL_INT_MAP_0_BIT_SLOPE BIT(2)
#define BMC150_ACCEL_REG_INT_MAP_1 0x1A
#define BMC150_ACCEL_INT_MAP_1_BIT_DATA BIT(0)
#define BMC150_ACCEL_INT_MAP_1_BIT_FWM BIT(1)
#define BMC150_ACCEL_INT_MAP_1_BIT_FFULL BIT(2)
#define BMC150_ACCEL_REG_INT_RST_LATCH 0x21
#define BMC150_ACCEL_INT_MODE_LATCH_RESET 0x80
#define BMC150_ACCEL_INT_MODE_LATCH_INT 0x0F
#define BMC150_ACCEL_INT_MODE_NON_LATCH_INT 0x00
#define BMC150_ACCEL_REG_INT_EN_0 0x16
#define BMC150_ACCEL_INT_EN_BIT_SLP_X BIT(0)
#define BMC150_ACCEL_INT_EN_BIT_SLP_Y BIT(1)
#define BMC150_ACCEL_INT_EN_BIT_SLP_Z BIT(2)
#define BMC150_ACCEL_REG_INT_EN_1 0x17
#define BMC150_ACCEL_INT_EN_BIT_DATA_EN BIT(4)
#define BMC150_ACCEL_INT_EN_BIT_FFULL_EN BIT(5)
#define BMC150_ACCEL_INT_EN_BIT_FWM_EN BIT(6)
#define BMC150_ACCEL_REG_INT_OUT_CTRL 0x20
#define BMC150_ACCEL_INT_OUT_CTRL_INT1_LVL BIT(0)
#define BMC150_ACCEL_REG_INT_5 0x27
#define BMC150_ACCEL_SLOPE_DUR_MASK 0x03
#define BMC150_ACCEL_REG_INT_6 0x28
#define BMC150_ACCEL_SLOPE_THRES_MASK 0xFF
/* Slope duration in terms of number of samples */
#define BMC150_ACCEL_DEF_SLOPE_DURATION 1
/* in terms of multiples of g's/LSB, based on range */
#define BMC150_ACCEL_DEF_SLOPE_THRESHOLD 1
#define BMC150_ACCEL_REG_XOUT_L 0x02
#define BMC150_ACCEL_MAX_STARTUP_TIME_MS 100
/* Sleep Duration values */
#define BMC150_ACCEL_SLEEP_500_MICRO 0x05
#define BMC150_ACCEL_SLEEP_1_MS 0x06
#define BMC150_ACCEL_SLEEP_2_MS 0x07
#define BMC150_ACCEL_SLEEP_4_MS 0x08
#define BMC150_ACCEL_SLEEP_6_MS 0x09
#define BMC150_ACCEL_SLEEP_10_MS 0x0A
#define BMC150_ACCEL_SLEEP_25_MS 0x0B
#define BMC150_ACCEL_SLEEP_50_MS 0x0C
#define BMC150_ACCEL_SLEEP_100_MS 0x0D
#define BMC150_ACCEL_SLEEP_500_MS 0x0E
#define BMC150_ACCEL_SLEEP_1_SEC 0x0F
#define BMC150_ACCEL_REG_TEMP 0x08
#define BMC150_ACCEL_TEMP_CENTER_VAL 23
#define BMC150_ACCEL_AXIS_TO_REG(axis) (BMC150_ACCEL_REG_XOUT_L + (axis * 2))
#define BMC150_AUTO_SUSPEND_DELAY_MS 2000
#define BMC150_ACCEL_REG_FIFO_STATUS 0x0E
#define BMC150_ACCEL_REG_FIFO_CONFIG0 0x30
#define BMC150_ACCEL_REG_FIFO_CONFIG1 0x3E
#define BMC150_ACCEL_REG_FIFO_DATA 0x3F
#define BMC150_ACCEL_FIFO_LENGTH 32
enum bmc150_accel_axis {
AXIS_X,
AXIS_Y,
AXIS_Z,
AXIS_MAX,
};
enum bmc150_power_modes {
BMC150_ACCEL_SLEEP_MODE_NORMAL,
BMC150_ACCEL_SLEEP_MODE_DEEP_SUSPEND,
BMC150_ACCEL_SLEEP_MODE_LPM,
BMC150_ACCEL_SLEEP_MODE_SUSPEND = 0x04,
};
struct bmc150_scale_info {
int scale;
u8 reg_range;
};
struct bmc150_accel_chip_info {
const char *name;
u8 chip_id;
const struct iio_chan_spec *channels;
int num_channels;
const struct bmc150_scale_info scale_table[4];
};
struct bmc150_accel_interrupt {
const struct bmc150_accel_interrupt_info *info;
atomic_t users;
};
struct bmc150_accel_trigger {
struct bmc150_accel_data *data;
struct iio_trigger *indio_trig;
int (*setup)(struct bmc150_accel_trigger *t, bool state);
int intr;
bool enabled;
};
enum bmc150_accel_interrupt_id {
BMC150_ACCEL_INT_DATA_READY,
BMC150_ACCEL_INT_ANY_MOTION,
BMC150_ACCEL_INT_WATERMARK,
BMC150_ACCEL_INTERRUPTS,
};
enum bmc150_accel_trigger_id {
BMC150_ACCEL_TRIGGER_DATA_READY,
BMC150_ACCEL_TRIGGER_ANY_MOTION,
BMC150_ACCEL_TRIGGERS,
};
struct bmc150_accel_data {
struct regmap *regmap;
int irq;
struct bmc150_accel_interrupt interrupts[BMC150_ACCEL_INTERRUPTS];
struct bmc150_accel_trigger triggers[BMC150_ACCEL_TRIGGERS];
struct mutex mutex;
u8 fifo_mode, watermark;
s16 buffer[8];
/*
* Ensure there is sufficient space and correct alignment for
* the timestamp if enabled
*/
struct {
__le16 channels[3];
s64 ts __aligned(8);
} scan;
u8 bw_bits;
u32 slope_dur;
u32 slope_thres;
u32 range;
int ev_enable_state;
int64_t timestamp, old_timestamp; /* Only used in hw fifo mode. */
const struct bmc150_accel_chip_info *chip_info;
struct iio_mount_matrix orientation;
};
static const struct {
int val;
int val2;
u8 bw_bits;
} bmc150_accel_samp_freq_table[] = { {15, 620000, 0x08},
{31, 260000, 0x09},
{62, 500000, 0x0A},
{125, 0, 0x0B},
{250, 0, 0x0C},
{500, 0, 0x0D},
{1000, 0, 0x0E},
{2000, 0, 0x0F} };
static const struct {
int bw_bits;
int msec;
} bmc150_accel_sample_upd_time[] = { {0x08, 64},
{0x09, 32},
{0x0A, 16},
{0x0B, 8},
{0x0C, 4},
{0x0D, 2},
{0x0E, 1},
{0x0F, 1} };
static const struct {
int sleep_dur;
u8 reg_value;
} bmc150_accel_sleep_value_table[] = { {0, 0},
{500, BMC150_ACCEL_SLEEP_500_MICRO},
{1000, BMC150_ACCEL_SLEEP_1_MS},
{2000, BMC150_ACCEL_SLEEP_2_MS},
{4000, BMC150_ACCEL_SLEEP_4_MS},
{6000, BMC150_ACCEL_SLEEP_6_MS},
{10000, BMC150_ACCEL_SLEEP_10_MS},
{25000, BMC150_ACCEL_SLEEP_25_MS},
{50000, BMC150_ACCEL_SLEEP_50_MS},
{100000, BMC150_ACCEL_SLEEP_100_MS},
{500000, BMC150_ACCEL_SLEEP_500_MS},
{1000000, BMC150_ACCEL_SLEEP_1_SEC} };
const struct regmap_config bmc150_regmap_conf = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x3f,
};
EXPORT_SYMBOL_GPL(bmc150_regmap_conf);
static int bmc150_accel_set_mode(struct bmc150_accel_data *data,
enum bmc150_power_modes mode,
int dur_us)
{
struct device *dev = regmap_get_device(data->regmap);
int i;
int ret;
u8 lpw_bits;
int dur_val = -1;
if (dur_us > 0) {
for (i = 0; i < ARRAY_SIZE(bmc150_accel_sleep_value_table);
++i) {
if (bmc150_accel_sleep_value_table[i].sleep_dur ==
dur_us)
dur_val =
bmc150_accel_sleep_value_table[i].reg_value;
}
} else {
dur_val = 0;
}
if (dur_val < 0)
return -EINVAL;
lpw_bits = mode << BMC150_ACCEL_PMU_MODE_SHIFT;
lpw_bits |= (dur_val << BMC150_ACCEL_PMU_BIT_SLEEP_DUR_SHIFT);
dev_dbg(dev, "Set Mode bits %x\n", lpw_bits);
ret = regmap_write(data->regmap, BMC150_ACCEL_REG_PMU_LPW, lpw_bits);
if (ret < 0) {
dev_err(dev, "Error writing reg_pmu_lpw\n");
return ret;
}
return 0;
}
static int bmc150_accel_set_bw(struct bmc150_accel_data *data, int val,
int val2)
{
int i;
int ret;
for (i = 0; i < ARRAY_SIZE(bmc150_accel_samp_freq_table); ++i) {
if (bmc150_accel_samp_freq_table[i].val == val &&
bmc150_accel_samp_freq_table[i].val2 == val2) {
ret = regmap_write(data->regmap,
BMC150_ACCEL_REG_PMU_BW,
bmc150_accel_samp_freq_table[i].bw_bits);
if (ret < 0)
return ret;
data->bw_bits =
bmc150_accel_samp_freq_table[i].bw_bits;
return 0;
}
}
return -EINVAL;
}
static int bmc150_accel_update_slope(struct bmc150_accel_data *data)
{
struct device *dev = regmap_get_device(data->regmap);
int ret;
ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_6,
data->slope_thres);
if (ret < 0) {
dev_err(dev, "Error writing reg_int_6\n");
return ret;
}
ret = regmap_update_bits(data->regmap, BMC150_ACCEL_REG_INT_5,
BMC150_ACCEL_SLOPE_DUR_MASK, data->slope_dur);
if (ret < 0) {
dev_err(dev, "Error updating reg_int_5\n");
return ret;
}
dev_dbg(dev, "%x %x\n", data->slope_thres, data->slope_dur);
return ret;
}
static int bmc150_accel_any_motion_setup(struct bmc150_accel_trigger *t,
bool state)
{
if (state)
return bmc150_accel_update_slope(t->data);
return 0;
}
static int bmc150_accel_get_bw(struct bmc150_accel_data *data, int *val,
int *val2)
{
int i;
for (i = 0; i < ARRAY_SIZE(bmc150_accel_samp_freq_table); ++i) {
if (bmc150_accel_samp_freq_table[i].bw_bits == data->bw_bits) {
*val = bmc150_accel_samp_freq_table[i].val;
*val2 = bmc150_accel_samp_freq_table[i].val2;
return IIO_VAL_INT_PLUS_MICRO;
}
}
return -EINVAL;
}
#ifdef CONFIG_PM
static int bmc150_accel_get_startup_times(struct bmc150_accel_data *data)
{
int i;
for (i = 0; i < ARRAY_SIZE(bmc150_accel_sample_upd_time); ++i) {
if (bmc150_accel_sample_upd_time[i].bw_bits == data->bw_bits)
return bmc150_accel_sample_upd_time[i].msec;
}
return BMC150_ACCEL_MAX_STARTUP_TIME_MS;
}
static int bmc150_accel_set_power_state(struct bmc150_accel_data *data, bool on)
{
struct device *dev = regmap_get_device(data->regmap);
int ret;
if (on) {
ret = pm_runtime_get_sync(dev);
} else {
pm_runtime_mark_last_busy(dev);
ret = pm_runtime_put_autosuspend(dev);
}
if (ret < 0) {
dev_err(dev,
"Failed: %s for %d\n", __func__, on);
if (on)
pm_runtime_put_noidle(dev);
return ret;
}
return 0;
}
#else
static int bmc150_accel_set_power_state(struct bmc150_accel_data *data, bool on)
{
return 0;
}
#endif
static const struct bmc150_accel_interrupt_info {
u8 map_reg;
u8 map_bitmask;
u8 en_reg;
u8 en_bitmask;
} bmc150_accel_interrupts[BMC150_ACCEL_INTERRUPTS] = {
{ /* data ready interrupt */
.map_reg = BMC150_ACCEL_REG_INT_MAP_1,
.map_bitmask = BMC150_ACCEL_INT_MAP_1_BIT_DATA,
.en_reg = BMC150_ACCEL_REG_INT_EN_1,
.en_bitmask = BMC150_ACCEL_INT_EN_BIT_DATA_EN,
},
{ /* motion interrupt */
.map_reg = BMC150_ACCEL_REG_INT_MAP_0,
.map_bitmask = BMC150_ACCEL_INT_MAP_0_BIT_SLOPE,
.en_reg = BMC150_ACCEL_REG_INT_EN_0,
.en_bitmask = BMC150_ACCEL_INT_EN_BIT_SLP_X |
BMC150_ACCEL_INT_EN_BIT_SLP_Y |
BMC150_ACCEL_INT_EN_BIT_SLP_Z
},
{ /* fifo watermark interrupt */
.map_reg = BMC150_ACCEL_REG_INT_MAP_1,
.map_bitmask = BMC150_ACCEL_INT_MAP_1_BIT_FWM,
.en_reg = BMC150_ACCEL_REG_INT_EN_1,
.en_bitmask = BMC150_ACCEL_INT_EN_BIT_FWM_EN,
},
};
static void bmc150_accel_interrupts_setup(struct iio_dev *indio_dev,
struct bmc150_accel_data *data)
{
int i;
for (i = 0; i < BMC150_ACCEL_INTERRUPTS; i++)
data->interrupts[i].info = &bmc150_accel_interrupts[i];
}
static int bmc150_accel_set_interrupt(struct bmc150_accel_data *data, int i,
bool state)
{
struct device *dev = regmap_get_device(data->regmap);
struct bmc150_accel_interrupt *intr = &data->interrupts[i];
const struct bmc150_accel_interrupt_info *info = intr->info;
int ret;
if (state) {
if (atomic_inc_return(&intr->users) > 1)
return 0;
} else {
if (atomic_dec_return(&intr->users) > 0)
return 0;
}
/*
* We will expect the enable and disable to do operation in reverse
* order. This will happen here anyway, as our resume operation uses
* sync mode runtime pm calls. The suspend operation will be delayed
* by autosuspend delay.
* So the disable operation will still happen in reverse order of
* enable operation. When runtime pm is disabled the mode is always on,
* so sequence doesn't matter.
*/
ret = bmc150_accel_set_power_state(data, state);
if (ret < 0)
return ret;
/* map the interrupt to the appropriate pins */
ret = regmap_update_bits(data->regmap, info->map_reg, info->map_bitmask,
(state ? info->map_bitmask : 0));
if (ret < 0) {
dev_err(dev, "Error updating reg_int_map\n");
goto out_fix_power_state;
}
/* enable/disable the interrupt */
ret = regmap_update_bits(data->regmap, info->en_reg, info->en_bitmask,
(state ? info->en_bitmask : 0));
if (ret < 0) {
dev_err(dev, "Error updating reg_int_en\n");
goto out_fix_power_state;
}
return 0;
out_fix_power_state:
bmc150_accel_set_power_state(data, false);
return ret;
}
static int bmc150_accel_set_scale(struct bmc150_accel_data *data, int val)
{
struct device *dev = regmap_get_device(data->regmap);
int ret, i;
for (i = 0; i < ARRAY_SIZE(data->chip_info->scale_table); ++i) {
if (data->chip_info->scale_table[i].scale == val) {
ret = regmap_write(data->regmap,
BMC150_ACCEL_REG_PMU_RANGE,
data->chip_info->scale_table[i].reg_range);
if (ret < 0) {
dev_err(dev, "Error writing pmu_range\n");
return ret;
}
data->range = data->chip_info->scale_table[i].reg_range;
return 0;
}
}
return -EINVAL;
}
static int bmc150_accel_get_temp(struct bmc150_accel_data *data, int *val)
{
struct device *dev = regmap_get_device(data->regmap);
int ret;
unsigned int value;
mutex_lock(&data->mutex);
ret = regmap_read(data->regmap, BMC150_ACCEL_REG_TEMP, &value);
if (ret < 0) {
dev_err(dev, "Error reading reg_temp\n");
mutex_unlock(&data->mutex);
return ret;
}
*val = sign_extend32(value, 7);
mutex_unlock(&data->mutex);
return IIO_VAL_INT;
}
static int bmc150_accel_get_axis(struct bmc150_accel_data *data,
struct iio_chan_spec const *chan,
int *val)
{
struct device *dev = regmap_get_device(data->regmap);
int ret;
int axis = chan->scan_index;
__le16 raw_val;
mutex_lock(&data->mutex);
ret = bmc150_accel_set_power_state(data, true);
if (ret < 0) {
mutex_unlock(&data->mutex);
return ret;
}
ret = regmap_bulk_read(data->regmap, BMC150_ACCEL_AXIS_TO_REG(axis),
&raw_val, sizeof(raw_val));
if (ret < 0) {
dev_err(dev, "Error reading axis %d\n", axis);
bmc150_accel_set_power_state(data, false);
mutex_unlock(&data->mutex);
return ret;
}
*val = sign_extend32(le16_to_cpu(raw_val) >> chan->scan_type.shift,
chan->scan_type.realbits - 1);
ret = bmc150_accel_set_power_state(data, false);
mutex_unlock(&data->mutex);
if (ret < 0)
return ret;
return IIO_VAL_INT;
}
static int bmc150_accel_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_TEMP:
return bmc150_accel_get_temp(data, val);
case IIO_ACCEL:
if (iio_buffer_enabled(indio_dev))
return -EBUSY;
else
return bmc150_accel_get_axis(data, chan, val);
default:
return -EINVAL;
}
case IIO_CHAN_INFO_OFFSET:
if (chan->type == IIO_TEMP) {
*val = BMC150_ACCEL_TEMP_CENTER_VAL;
return IIO_VAL_INT;
} else {
return -EINVAL;
}
case IIO_CHAN_INFO_SCALE:
*val = 0;
switch (chan->type) {
case IIO_TEMP:
*val2 = 500000;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_ACCEL:
{
int i;
const struct bmc150_scale_info *si;
int st_size = ARRAY_SIZE(data->chip_info->scale_table);
for (i = 0; i < st_size; ++i) {
si = &data->chip_info->scale_table[i];
if (si->reg_range == data->range) {
*val2 = si->scale;
return IIO_VAL_INT_PLUS_MICRO;
}
}
return -EINVAL;
}
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SAMP_FREQ:
mutex_lock(&data->mutex);
ret = bmc150_accel_get_bw(data, val, val2);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
}
static int bmc150_accel_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
mutex_lock(&data->mutex);
ret = bmc150_accel_set_bw(data, val, val2);
mutex_unlock(&data->mutex);
break;
case IIO_CHAN_INFO_SCALE:
if (val)
return -EINVAL;
mutex_lock(&data->mutex);
ret = bmc150_accel_set_scale(data, val2);
mutex_unlock(&data->mutex);
return ret;
default:
ret = -EINVAL;
}
return ret;
}
static int bmc150_accel_read_event(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int *val, int *val2)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
*val2 = 0;
switch (info) {
case IIO_EV_INFO_VALUE:
*val = data->slope_thres;
break;
case IIO_EV_INFO_PERIOD:
*val = data->slope_dur;
break;
default:
return -EINVAL;
}
return IIO_VAL_INT;
}
static int bmc150_accel_write_event(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int val, int val2)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
if (data->ev_enable_state)
return -EBUSY;
switch (info) {
case IIO_EV_INFO_VALUE:
data->slope_thres = val & BMC150_ACCEL_SLOPE_THRES_MASK;
break;
case IIO_EV_INFO_PERIOD:
data->slope_dur = val & BMC150_ACCEL_SLOPE_DUR_MASK;
break;
default:
return -EINVAL;
}
return 0;
}
static int bmc150_accel_read_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
return data->ev_enable_state;
}
static int bmc150_accel_write_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
int state)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
int ret;
if (state == data->ev_enable_state)
return 0;
mutex_lock(&data->mutex);
ret = bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_ANY_MOTION,
state);
if (ret < 0) {
mutex_unlock(&data->mutex);
return ret;
}
data->ev_enable_state = state;
mutex_unlock(&data->mutex);
return 0;
}
static int bmc150_accel_validate_trigger(struct iio_dev *indio_dev,
struct iio_trigger *trig)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
int i;
for (i = 0; i < BMC150_ACCEL_TRIGGERS; i++) {
if (data->triggers[i].indio_trig == trig)
return 0;
}
return -EINVAL;
}
static ssize_t bmc150_accel_get_fifo_watermark(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct bmc150_accel_data *data = iio_priv(indio_dev);
int wm;
mutex_lock(&data->mutex);
wm = data->watermark;
mutex_unlock(&data->mutex);
return sprintf(buf, "%d\n", wm);
}
static ssize_t bmc150_accel_get_fifo_state(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct bmc150_accel_data *data = iio_priv(indio_dev);
bool state;
mutex_lock(&data->mutex);
state = data->fifo_mode;
mutex_unlock(&data->mutex);
return sprintf(buf, "%d\n", state);
}
static const struct iio_mount_matrix *
bmc150_accel_get_mount_matrix(const struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
return &data->orientation;
}
static const struct iio_chan_spec_ext_info bmc150_accel_ext_info[] = {
IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bmc150_accel_get_mount_matrix),
{ }
};
static IIO_CONST_ATTR(hwfifo_watermark_min, "1");
static IIO_CONST_ATTR(hwfifo_watermark_max,
__stringify(BMC150_ACCEL_FIFO_LENGTH));
static IIO_DEVICE_ATTR(hwfifo_enabled, S_IRUGO,
bmc150_accel_get_fifo_state, NULL, 0);
static IIO_DEVICE_ATTR(hwfifo_watermark, S_IRUGO,
bmc150_accel_get_fifo_watermark, NULL, 0);
static const struct attribute *bmc150_accel_fifo_attributes[] = {
&iio_const_attr_hwfifo_watermark_min.dev_attr.attr,
&iio_const_attr_hwfifo_watermark_max.dev_attr.attr,
&iio_dev_attr_hwfifo_watermark.dev_attr.attr,
&iio_dev_attr_hwfifo_enabled.dev_attr.attr,
NULL,
};
static int bmc150_accel_set_watermark(struct iio_dev *indio_dev, unsigned val)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
if (val > BMC150_ACCEL_FIFO_LENGTH)
val = BMC150_ACCEL_FIFO_LENGTH;
mutex_lock(&data->mutex);
data->watermark = val;
mutex_unlock(&data->mutex);
return 0;
}
/*
* We must read at least one full frame in one burst, otherwise the rest of the
* frame data is discarded.
*/
static int bmc150_accel_fifo_transfer(struct bmc150_accel_data *data,
char *buffer, int samples)
{
struct device *dev = regmap_get_device(data->regmap);
int sample_length = 3 * 2;
int ret;
int total_length = samples * sample_length;
ret = regmap_raw_read(data->regmap, BMC150_ACCEL_REG_FIFO_DATA,
buffer, total_length);
if (ret)
dev_err(dev,
"Error transferring data from fifo: %d\n", ret);
return ret;
}
static int __bmc150_accel_fifo_flush(struct iio_dev *indio_dev,
unsigned samples, bool irq)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
struct device *dev = regmap_get_device(data->regmap);
int ret, i;
u8 count;
u16 buffer[BMC150_ACCEL_FIFO_LENGTH * 3];
int64_t tstamp;
uint64_t sample_period;
unsigned int val;
ret = regmap_read(data->regmap, BMC150_ACCEL_REG_FIFO_STATUS, &val);
if (ret < 0) {
dev_err(dev, "Error reading reg_fifo_status\n");
return ret;
}
count = val & 0x7F;
if (!count)
return 0;
/*
* If we getting called from IRQ handler we know the stored timestamp is
* fairly accurate for the last stored sample. Otherwise, if we are
* called as a result of a read operation from userspace and hence
* before the watermark interrupt was triggered, take a timestamp
* now. We can fall anywhere in between two samples so the error in this
* case is at most one sample period.
*/
if (!irq) {
data->old_timestamp = data->timestamp;
data->timestamp = iio_get_time_ns(indio_dev);
}
/*
* Approximate timestamps for each of the sample based on the sampling
* frequency, timestamp for last sample and number of samples.
*
* Note that we can't use the current bandwidth settings to compute the
* sample period because the sample rate varies with the device
* (e.g. between 31.70ms to 32.20ms for a bandwidth of 15.63HZ). That
* small variation adds when we store a large number of samples and
* creates significant jitter between the last and first samples in
* different batches (e.g. 32ms vs 21ms).
*
* To avoid this issue we compute the actual sample period ourselves
* based on the timestamp delta between the last two flush operations.
*/
sample_period = (data->timestamp - data->old_timestamp);
do_div(sample_period, count);
tstamp = data->timestamp - (count - 1) * sample_period;
if (samples && count > samples)
count = samples;
ret = bmc150_accel_fifo_transfer(data, (u8 *)buffer, count);
if (ret)
return ret;
/*
* Ideally we want the IIO core to handle the demux when running in fifo
* mode but not when running in triggered buffer mode. Unfortunately
* this does not seem to be possible, so stick with driver demux for
* now.
*/
for (i = 0; i < count; i++) {
int j, bit;
j = 0;
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength)
memcpy(&data->scan.channels[j++], &buffer[i * 3 + bit],
sizeof(data->scan.channels[0]));
iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
tstamp);
tstamp += sample_period;
}
return count;
}
static int bmc150_accel_fifo_flush(struct iio_dev *indio_dev, unsigned samples)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = __bmc150_accel_fifo_flush(indio_dev, samples, false);
mutex_unlock(&data->mutex);
return ret;
}
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
"15.620000 31.260000 62.50000 125 250 500 1000 2000");
static struct attribute *bmc150_accel_attributes[] = {
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
static const struct attribute_group bmc150_accel_attrs_group = {
.attrs = bmc150_accel_attributes,
};
static const struct iio_event_spec bmc150_accel_event = {
.type = IIO_EV_TYPE_ROC,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_PERIOD)
};
#define BMC150_ACCEL_CHANNEL(_axis, bits) { \
.type = IIO_ACCEL, \
.modified = 1, \
.channel2 = IIO_MOD_##_axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.scan_index = AXIS_##_axis, \
.scan_type = { \
.sign = 's', \
.realbits = (bits), \
.storagebits = 16, \
.shift = 16 - (bits), \
.endianness = IIO_LE, \
}, \
.ext_info = bmc150_accel_ext_info, \
.event_spec = &bmc150_accel_event, \
.num_event_specs = 1 \
}
#define BMC150_ACCEL_CHANNELS(bits) { \
{ \
.type = IIO_TEMP, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_OFFSET), \
.scan_index = -1, \
}, \
BMC150_ACCEL_CHANNEL(X, bits), \
BMC150_ACCEL_CHANNEL(Y, bits), \
BMC150_ACCEL_CHANNEL(Z, bits), \
IIO_CHAN_SOFT_TIMESTAMP(3), \
}
static const struct iio_chan_spec bma222e_accel_channels[] =
BMC150_ACCEL_CHANNELS(8);
static const struct iio_chan_spec bma250e_accel_channels[] =
BMC150_ACCEL_CHANNELS(10);
static const struct iio_chan_spec bmc150_accel_channels[] =
BMC150_ACCEL_CHANNELS(12);
static const struct iio_chan_spec bma280_accel_channels[] =
BMC150_ACCEL_CHANNELS(14);
static const struct bmc150_accel_chip_info bmc150_accel_chip_info_tbl[] = {
[bmc150] = {
.name = "BMC150A",
.chip_id = 0xFA,
.channels = bmc150_accel_channels,
.num_channels = ARRAY_SIZE(bmc150_accel_channels),
.scale_table = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
{19122, BMC150_ACCEL_DEF_RANGE_4G},
{38344, BMC150_ACCEL_DEF_RANGE_8G},
{76590, BMC150_ACCEL_DEF_RANGE_16G} },
},
[bmi055] = {
.name = "BMI055A",
.chip_id = 0xFA,
.channels = bmc150_accel_channels,
.num_channels = ARRAY_SIZE(bmc150_accel_channels),
.scale_table = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
{19122, BMC150_ACCEL_DEF_RANGE_4G},
{38344, BMC150_ACCEL_DEF_RANGE_8G},
{76590, BMC150_ACCEL_DEF_RANGE_16G} },
},
[bma255] = {
.name = "BMA0255",
.chip_id = 0xFA,
.channels = bmc150_accel_channels,
.num_channels = ARRAY_SIZE(bmc150_accel_channels),
.scale_table = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
{19122, BMC150_ACCEL_DEF_RANGE_4G},
{38344, BMC150_ACCEL_DEF_RANGE_8G},
{76590, BMC150_ACCEL_DEF_RANGE_16G} },
},
[bma250e] = {
.name = "BMA250E",
.chip_id = 0xF9,
.channels = bma250e_accel_channels,
.num_channels = ARRAY_SIZE(bma250e_accel_channels),
.scale_table = { {38344, BMC150_ACCEL_DEF_RANGE_2G},
{76590, BMC150_ACCEL_DEF_RANGE_4G},
{153277, BMC150_ACCEL_DEF_RANGE_8G},
{306457, BMC150_ACCEL_DEF_RANGE_16G} },
},
[bma222e] = {
.name = "BMA222E",
.chip_id = 0xF8,
.channels = bma222e_accel_channels,
.num_channels = ARRAY_SIZE(bma222e_accel_channels),
.scale_table = { {153277, BMC150_ACCEL_DEF_RANGE_2G},
{306457, BMC150_ACCEL_DEF_RANGE_4G},
{612915, BMC150_ACCEL_DEF_RANGE_8G},
{1225831, BMC150_ACCEL_DEF_RANGE_16G} },
},
[bma280] = {
.name = "BMA0280",
.chip_id = 0xFB,
.channels = bma280_accel_channels,
.num_channels = ARRAY_SIZE(bma280_accel_channels),
.scale_table = { {2392, BMC150_ACCEL_DEF_RANGE_2G},
{4785, BMC150_ACCEL_DEF_RANGE_4G},
{9581, BMC150_ACCEL_DEF_RANGE_8G},
{19152, BMC150_ACCEL_DEF_RANGE_16G} },
},
};
static const struct iio_info bmc150_accel_info = {
.attrs = &bmc150_accel_attrs_group,
.read_raw = bmc150_accel_read_raw,
.write_raw = bmc150_accel_write_raw,
.read_event_value = bmc150_accel_read_event,
.write_event_value = bmc150_accel_write_event,
.write_event_config = bmc150_accel_write_event_config,
.read_event_config = bmc150_accel_read_event_config,
};
static const struct iio_info bmc150_accel_info_fifo = {
.attrs = &bmc150_accel_attrs_group,
.read_raw = bmc150_accel_read_raw,
.write_raw = bmc150_accel_write_raw,
.read_event_value = bmc150_accel_read_event,
.write_event_value = bmc150_accel_write_event,
.write_event_config = bmc150_accel_write_event_config,
.read_event_config = bmc150_accel_read_event_config,
.validate_trigger = bmc150_accel_validate_trigger,
.hwfifo_set_watermark = bmc150_accel_set_watermark,
.hwfifo_flush_to_buffer = bmc150_accel_fifo_flush,
};
static const unsigned long bmc150_accel_scan_masks[] = {
BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),
0};
static irqreturn_t bmc150_accel_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct bmc150_accel_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = regmap_bulk_read(data->regmap, BMC150_ACCEL_REG_XOUT_L,
data->buffer, AXIS_MAX * 2);
mutex_unlock(&data->mutex);
if (ret < 0)
goto err_read;
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
pf->timestamp);
err_read:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int bmc150_accel_trig_try_reen(struct iio_trigger *trig)
{
struct bmc150_accel_trigger *t = iio_trigger_get_drvdata(trig);
struct bmc150_accel_data *data = t->data;
struct device *dev = regmap_get_device(data->regmap);
int ret;
/* new data interrupts don't need ack */
if (t == &t->data->triggers[BMC150_ACCEL_TRIGGER_DATA_READY])
return 0;
mutex_lock(&data->mutex);
/* clear any latched interrupt */
ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
BMC150_ACCEL_INT_MODE_LATCH_INT |
BMC150_ACCEL_INT_MODE_LATCH_RESET);
mutex_unlock(&data->mutex);
if (ret < 0) {
dev_err(dev, "Error writing reg_int_rst_latch\n");
return ret;
}
return 0;
}
static int bmc150_accel_trigger_set_state(struct iio_trigger *trig,
bool state)
{
struct bmc150_accel_trigger *t = iio_trigger_get_drvdata(trig);
struct bmc150_accel_data *data = t->data;
int ret;
mutex_lock(&data->mutex);
if (t->enabled == state) {
mutex_unlock(&data->mutex);
return 0;
}
if (t->setup) {
ret = t->setup(t, state);
if (ret < 0) {
mutex_unlock(&data->mutex);
return ret;
}
}
ret = bmc150_accel_set_interrupt(data, t->intr, state);
if (ret < 0) {
mutex_unlock(&data->mutex);
return ret;
}
t->enabled = state;
mutex_unlock(&data->mutex);
return ret;
}
static const struct iio_trigger_ops bmc150_accel_trigger_ops = {
.set_trigger_state = bmc150_accel_trigger_set_state,
.try_reenable = bmc150_accel_trig_try_reen,
};
static int bmc150_accel_handle_roc_event(struct iio_dev *indio_dev)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
struct device *dev = regmap_get_device(data->regmap);
int dir;
int ret;
unsigned int val;
ret = regmap_read(data->regmap, BMC150_ACCEL_REG_INT_STATUS_2, &val);
if (ret < 0) {
dev_err(dev, "Error reading reg_int_status_2\n");
return ret;
}
if (val & BMC150_ACCEL_ANY_MOTION_BIT_SIGN)
dir = IIO_EV_DIR_FALLING;
else
dir = IIO_EV_DIR_RISING;
if (val & BMC150_ACCEL_ANY_MOTION_BIT_X)
iio_push_event(indio_dev,
IIO_MOD_EVENT_CODE(IIO_ACCEL,
0,
IIO_MOD_X,
IIO_EV_TYPE_ROC,
dir),
data->timestamp);
if (val & BMC150_ACCEL_ANY_MOTION_BIT_Y)
iio_push_event(indio_dev,
IIO_MOD_EVENT_CODE(IIO_ACCEL,
0,
IIO_MOD_Y,
IIO_EV_TYPE_ROC,
dir),
data->timestamp);
if (val & BMC150_ACCEL_ANY_MOTION_BIT_Z)
iio_push_event(indio_dev,
IIO_MOD_EVENT_CODE(IIO_ACCEL,
0,
IIO_MOD_Z,
IIO_EV_TYPE_ROC,
dir),
data->timestamp);
return ret;
}
static irqreturn_t bmc150_accel_irq_thread_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct bmc150_accel_data *data = iio_priv(indio_dev);
struct device *dev = regmap_get_device(data->regmap);
bool ack = false;
int ret;
mutex_lock(&data->mutex);
if (data->fifo_mode) {
ret = __bmc150_accel_fifo_flush(indio_dev,
BMC150_ACCEL_FIFO_LENGTH, true);
if (ret > 0)
ack = true;
}
if (data->ev_enable_state) {
ret = bmc150_accel_handle_roc_event(indio_dev);
if (ret > 0)
ack = true;
}
if (ack) {
ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
BMC150_ACCEL_INT_MODE_LATCH_INT |
BMC150_ACCEL_INT_MODE_LATCH_RESET);
if (ret)
dev_err(dev, "Error writing reg_int_rst_latch\n");
ret = IRQ_HANDLED;
} else {
ret = IRQ_NONE;
}
mutex_unlock(&data->mutex);
return ret;
}
static irqreturn_t bmc150_accel_irq_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct bmc150_accel_data *data = iio_priv(indio_dev);
bool ack = false;
int i;
data->old_timestamp = data->timestamp;
data->timestamp = iio_get_time_ns(indio_dev);
for (i = 0; i < BMC150_ACCEL_TRIGGERS; i++) {
if (data->triggers[i].enabled) {
iio_trigger_poll(data->triggers[i].indio_trig);
ack = true;
break;
}
}
if (data->ev_enable_state || data->fifo_mode)
return IRQ_WAKE_THREAD;
if (ack)
return IRQ_HANDLED;
return IRQ_NONE;
}
static const struct {
int intr;
const char *name;
int (*setup)(struct bmc150_accel_trigger *t, bool state);
} bmc150_accel_triggers[BMC150_ACCEL_TRIGGERS] = {
{
.intr = 0,
.name = "%s-dev%d",
},
{
.intr = 1,
.name = "%s-any-motion-dev%d",
.setup = bmc150_accel_any_motion_setup,
},
};
static void bmc150_accel_unregister_triggers(struct bmc150_accel_data *data,
int from)
{
int i;
for (i = from; i >= 0; i--) {
if (data->triggers[i].indio_trig) {
iio_trigger_unregister(data->triggers[i].indio_trig);
data->triggers[i].indio_trig = NULL;
}
}
}
static int bmc150_accel_triggers_setup(struct iio_dev *indio_dev,
struct bmc150_accel_data *data)
{
struct device *dev = regmap_get_device(data->regmap);
int i, ret;
for (i = 0; i < BMC150_ACCEL_TRIGGERS; i++) {
struct bmc150_accel_trigger *t = &data->triggers[i];
t->indio_trig = devm_iio_trigger_alloc(dev,
bmc150_accel_triggers[i].name,
indio_dev->name,
indio_dev->id);
if (!t->indio_trig) {
ret = -ENOMEM;
break;
}
t->indio_trig->dev.parent = dev;
t->indio_trig->ops = &bmc150_accel_trigger_ops;
t->intr = bmc150_accel_triggers[i].intr;
t->data = data;
t->setup = bmc150_accel_triggers[i].setup;
iio_trigger_set_drvdata(t->indio_trig, t);
ret = iio_trigger_register(t->indio_trig);
if (ret)
break;
}
if (ret)
bmc150_accel_unregister_triggers(data, i - 1);
return ret;
}
#define BMC150_ACCEL_FIFO_MODE_STREAM 0x80
#define BMC150_ACCEL_FIFO_MODE_FIFO 0x40
#define BMC150_ACCEL_FIFO_MODE_BYPASS 0x00
static int bmc150_accel_fifo_set_mode(struct bmc150_accel_data *data)
{
struct device *dev = regmap_get_device(data->regmap);
u8 reg = BMC150_ACCEL_REG_FIFO_CONFIG1;
int ret;
ret = regmap_write(data->regmap, reg, data->fifo_mode);
if (ret < 0) {
dev_err(dev, "Error writing reg_fifo_config1\n");
return ret;
}
if (!data->fifo_mode)
return 0;
ret = regmap_write(data->regmap, BMC150_ACCEL_REG_FIFO_CONFIG0,
data->watermark);
if (ret < 0)
dev_err(dev, "Error writing reg_fifo_config0\n");
return ret;
}
static int bmc150_accel_buffer_preenable(struct iio_dev *indio_dev)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
return bmc150_accel_set_power_state(data, true);
}
static int bmc150_accel_buffer_postenable(struct iio_dev *indio_dev)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
int ret = 0;
if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED)
return 0;
mutex_lock(&data->mutex);
if (!data->watermark)
goto out;
ret = bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_WATERMARK,
true);
if (ret)
goto out;
data->fifo_mode = BMC150_ACCEL_FIFO_MODE_FIFO;
ret = bmc150_accel_fifo_set_mode(data);
if (ret) {
data->fifo_mode = 0;
bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_WATERMARK,
false);
}
out:
mutex_unlock(&data->mutex);
return ret;
}
static int bmc150_accel_buffer_predisable(struct iio_dev *indio_dev)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED)
return 0;
mutex_lock(&data->mutex);
if (!data->fifo_mode)
goto out;
bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_WATERMARK, false);
__bmc150_accel_fifo_flush(indio_dev, BMC150_ACCEL_FIFO_LENGTH, false);
data->fifo_mode = 0;
bmc150_accel_fifo_set_mode(data);
out:
mutex_unlock(&data->mutex);
return 0;
}
static int bmc150_accel_buffer_postdisable(struct iio_dev *indio_dev)
{
struct bmc150_accel_data *data = iio_priv(indio_dev);
return bmc150_accel_set_power_state(data, false);
}
static const struct iio_buffer_setup_ops bmc150_accel_buffer_ops = {
.preenable = bmc150_accel_buffer_preenable,
.postenable = bmc150_accel_buffer_postenable,
.predisable = bmc150_accel_buffer_predisable,
.postdisable = bmc150_accel_buffer_postdisable,
};
static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
{
struct device *dev = regmap_get_device(data->regmap);
int ret, i;
unsigned int val;
/*
* Reset chip to get it in a known good state. A delay of 1.8ms after
* reset is required according to the data sheets of supported chips.
*/
regmap_write(data->regmap, BMC150_ACCEL_REG_RESET,
BMC150_ACCEL_RESET_VAL);
usleep_range(1800, 2500);
ret = regmap_read(data->regmap, BMC150_ACCEL_REG_CHIP_ID, &val);
if (ret < 0) {
dev_err(dev, "Error: Reading chip id\n");
return ret;
}
dev_dbg(dev, "Chip Id %x\n", val);
for (i = 0; i < ARRAY_SIZE(bmc150_accel_chip_info_tbl); i++) {
if (bmc150_accel_chip_info_tbl[i].chip_id == val) {
data->chip_info = &bmc150_accel_chip_info_tbl[i];
break;
}
}
if (!data->chip_info) {
dev_err(dev, "Invalid chip %x\n", val);
return -ENODEV;
}
ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0);
if (ret < 0)
return ret;
/* Set Bandwidth */
ret = bmc150_accel_set_bw(data, BMC150_ACCEL_DEF_BW, 0);
if (ret < 0)
return ret;
/* Set Default Range */
ret = regmap_write(data->regmap, BMC150_ACCEL_REG_PMU_RANGE,
BMC150_ACCEL_DEF_RANGE_4G);
if (ret < 0) {
dev_err(dev, "Error writing reg_pmu_range\n");
return ret;
}
data->range = BMC150_ACCEL_DEF_RANGE_4G;
/* Set default slope duration and thresholds */
data->slope_thres = BMC150_ACCEL_DEF_SLOPE_THRESHOLD;
data->slope_dur = BMC150_ACCEL_DEF_SLOPE_DURATION;
ret = bmc150_accel_update_slope(data);
if (ret < 0)
return ret;
/* Set default as latched interrupts */
ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
BMC150_ACCEL_INT_MODE_LATCH_INT |
BMC150_ACCEL_INT_MODE_LATCH_RESET);
if (ret < 0) {
dev_err(dev, "Error writing reg_int_rst_latch\n");
return ret;
}
return 0;
}
int bmc150_accel_core_probe(struct device *dev, struct regmap *regmap, int irq,
const char *name, bool block_supported)
{
struct bmc150_accel_data *data;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
dev_set_drvdata(dev, indio_dev);
data->irq = irq;
data->regmap = regmap;
ret = iio_read_mount_matrix(dev, "mount-matrix",
&data->orientation);
if (ret)
return ret;
ret = bmc150_accel_chip_init(data);
if (ret < 0)
return ret;
mutex_init(&data->mutex);
indio_dev->channels = data->chip_info->channels;
indio_dev->num_channels = data->chip_info->num_channels;
indio_dev->name = name ? name : data->chip_info->name;
indio_dev->available_scan_masks = bmc150_accel_scan_masks;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &bmc150_accel_info;
ret = iio_triggered_buffer_setup(indio_dev,
&iio_pollfunc_store_time,
bmc150_accel_trigger_handler,
&bmc150_accel_buffer_ops);
if (ret < 0) {
dev_err(dev, "Failed: iio triggered buffer setup\n");
return ret;
}
if (data->irq > 0) {
ret = devm_request_threaded_irq(
dev, data->irq,
bmc150_accel_irq_handler,
bmc150_accel_irq_thread_handler,
IRQF_TRIGGER_RISING,
BMC150_ACCEL_IRQ_NAME,
indio_dev);
if (ret)
goto err_buffer_cleanup;
/*
* Set latched mode interrupt. While certain interrupts are
* non-latched regardless of this settings (e.g. new data) we
* want to use latch mode when we can to prevent interrupt
* flooding.
*/
ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
BMC150_ACCEL_INT_MODE_LATCH_RESET);
if (ret < 0) {
dev_err(dev, "Error writing reg_int_rst_latch\n");
goto err_buffer_cleanup;
}
bmc150_accel_interrupts_setup(indio_dev, data);
ret = bmc150_accel_triggers_setup(indio_dev, data);
if (ret)
goto err_buffer_cleanup;
if (block_supported) {
indio_dev->modes |= INDIO_BUFFER_SOFTWARE;
indio_dev->info = &bmc150_accel_info_fifo;
iio_buffer_set_attrs(indio_dev->buffer,
bmc150_accel_fifo_attributes);
}
}
ret = pm_runtime_set_active(dev);
if (ret)
goto err_trigger_unregister;
pm_runtime_enable(dev);
pm_runtime_set_autosuspend_delay(dev, BMC150_AUTO_SUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(dev);
ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(dev, "Unable to register iio device\n");
goto err_trigger_unregister;
}
return 0;
err_trigger_unregister:
bmc150_accel_unregister_triggers(data, BMC150_ACCEL_TRIGGERS - 1);
err_buffer_cleanup:
iio_triggered_buffer_cleanup(indio_dev);
return ret;
}
EXPORT_SYMBOL_GPL(bmc150_accel_core_probe);
int bmc150_accel_core_remove(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct bmc150_accel_data *data = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
pm_runtime_disable(dev);
pm_runtime_set_suspended(dev);
pm_runtime_put_noidle(dev);
bmc150_accel_unregister_triggers(data, BMC150_ACCEL_TRIGGERS - 1);
iio_triggered_buffer_cleanup(indio_dev);
mutex_lock(&data->mutex);
bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_DEEP_SUSPEND, 0);
mutex_unlock(&data->mutex);
return 0;
}
EXPORT_SYMBOL_GPL(bmc150_accel_core_remove);
#ifdef CONFIG_PM_SLEEP
static int bmc150_accel_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct bmc150_accel_data *data = iio_priv(indio_dev);
mutex_lock(&data->mutex);
bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_SUSPEND, 0);
mutex_unlock(&data->mutex);
return 0;
}
static int bmc150_accel_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct bmc150_accel_data *data = iio_priv(indio_dev);
mutex_lock(&data->mutex);
bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0);
bmc150_accel_fifo_set_mode(data);
mutex_unlock(&data->mutex);
return 0;
}
#endif
#ifdef CONFIG_PM
static int bmc150_accel_runtime_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct bmc150_accel_data *data = iio_priv(indio_dev);
int ret;
ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_SUSPEND, 0);
if (ret < 0)
return -EAGAIN;
return 0;
}
static int bmc150_accel_runtime_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct bmc150_accel_data *data = iio_priv(indio_dev);
int ret;
int sleep_val;
ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0);
if (ret < 0)
return ret;
ret = bmc150_accel_fifo_set_mode(data);
if (ret < 0)
return ret;
sleep_val = bmc150_accel_get_startup_times(data);
if (sleep_val < 20)
usleep_range(sleep_val * 1000, 20000);
else
msleep_interruptible(sleep_val);
return 0;
}
#endif
const struct dev_pm_ops bmc150_accel_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(bmc150_accel_suspend, bmc150_accel_resume)
SET_RUNTIME_PM_OPS(bmc150_accel_runtime_suspend,
bmc150_accel_runtime_resume, NULL)
};
EXPORT_SYMBOL_GPL(bmc150_accel_pm_ops);
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("BMC150 accelerometer driver");