linux/drivers/iio/accel/mma9553.c
Octavian Purdila c176becd81 iio: fix drivers that consider 0 as a valid IRQ in client->irq
Since patch "i2c / ACPI: Use 0 to indicate that device does not have
interrupt assigned" [1], 0 is not a valid i2c client irq anymore, so
change all driver's checks accordingly.

The same issue occurs when the device is instantiated via device tree
with no IRQ, or from the i2c sysfs interface, even before the patch
above.

[1] http://lkml.kernel.org/g/<1430908148-201129-3-git-send-email-mika.westerberg@linux.intel.com>

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-07-23 20:23:11 +01:00

1306 lines
33 KiB
C

/*
* Freescale MMA9553L Intelligent Pedometer driver
* Copyright (c) 2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/pm_runtime.h>
#include "mma9551_core.h"
#define MMA9553_DRV_NAME "mma9553"
#define MMA9553_IRQ_NAME "mma9553_event"
#define MMA9553_GPIO_NAME "mma9553_int"
/* Pedometer configuration registers (R/W) */
#define MMA9553_REG_CONF_SLEEPMIN 0x00
#define MMA9553_REG_CONF_SLEEPMAX 0x02
#define MMA9553_REG_CONF_SLEEPTHD 0x04
#define MMA9553_MASK_CONF_WORD GENMASK(15, 0)
#define MMA9553_REG_CONF_CONF_STEPLEN 0x06
#define MMA9553_MASK_CONF_CONFIG BIT(15)
#define MMA9553_MASK_CONF_ACT_DBCNTM BIT(14)
#define MMA9553_MASK_CONF_SLP_DBCNTM BIT(13)
#define MMA9553_MASK_CONF_STEPLEN GENMASK(7, 0)
#define MMA9553_REG_CONF_HEIGHT_WEIGHT 0x08
#define MMA9553_MASK_CONF_HEIGHT GENMASK(15, 8)
#define MMA9553_MASK_CONF_WEIGHT GENMASK(7, 0)
#define MMA9553_REG_CONF_FILTER 0x0A
#define MMA9553_MASK_CONF_FILTSTEP GENMASK(15, 8)
#define MMA9553_MASK_CONF_MALE BIT(7)
#define MMA9553_MASK_CONF_FILTTIME GENMASK(6, 0)
#define MMA9553_REG_CONF_SPEED_STEP 0x0C
#define MMA9553_MASK_CONF_SPDPRD GENMASK(15, 8)
#define MMA9553_MASK_CONF_STEPCOALESCE GENMASK(7, 0)
#define MMA9553_REG_CONF_ACTTHD 0x0E
#define MMA9553_MAX_ACTTHD GENMASK(15, 0)
/* Pedometer status registers (R-only) */
#define MMA9553_REG_STATUS 0x00
#define MMA9553_MASK_STATUS_MRGFL BIT(15)
#define MMA9553_MASK_STATUS_SUSPCHG BIT(14)
#define MMA9553_MASK_STATUS_STEPCHG BIT(13)
#define MMA9553_MASK_STATUS_ACTCHG BIT(12)
#define MMA9553_MASK_STATUS_SUSP BIT(11)
#define MMA9553_MASK_STATUS_ACTIVITY GENMASK(10, 8)
#define MMA9553_MASK_STATUS_VERSION GENMASK(7, 0)
#define MMA9553_REG_STEPCNT 0x02
#define MMA9553_REG_DISTANCE 0x04
#define MMA9553_REG_SPEED 0x06
#define MMA9553_REG_CALORIES 0x08
#define MMA9553_REG_SLEEPCNT 0x0A
/* Pedometer events are always mapped to this pin. */
#define MMA9553_DEFAULT_GPIO_PIN mma9551_gpio6
#define MMA9553_DEFAULT_GPIO_POLARITY 0
/* Bitnum used for GPIO configuration = bit number in high status byte */
#define MMA9553_STATUS_TO_BITNUM(bit) (ffs(bit) - 9)
#define MMA9553_MAX_BITNUM MMA9553_STATUS_TO_BITNUM(BIT(16))
#define MMA9553_DEFAULT_SAMPLE_RATE 30 /* Hz */
/*
* The internal activity level must be stable for ACTTHD samples before
* ACTIVITY is updated. The ACTIVITY variable contains the current activity
* level and is updated every time a step is detected or once a second
* if there are no steps.
*/
#define MMA9553_ACTIVITY_THD_TO_SEC(thd) ((thd) / MMA9553_DEFAULT_SAMPLE_RATE)
#define MMA9553_ACTIVITY_SEC_TO_THD(sec) ((sec) * MMA9553_DEFAULT_SAMPLE_RATE)
/*
* Autonomously suspend pedometer if acceleration vector magnitude
* is near 1g (4096 at 0.244 mg/LSB resolution) for 30 seconds.
*/
#define MMA9553_DEFAULT_SLEEPMIN 3688 /* 0,9 g */
#define MMA9553_DEFAULT_SLEEPMAX 4508 /* 1,1 g */
#define MMA9553_DEFAULT_SLEEPTHD (MMA9553_DEFAULT_SAMPLE_RATE * 30)
#define MMA9553_CONFIG_RETRIES 2
/* Status register - activity field */
enum activity_level {
ACTIVITY_UNKNOWN,
ACTIVITY_REST,
ACTIVITY_WALKING,
ACTIVITY_JOGGING,
ACTIVITY_RUNNING,
};
static struct mma9553_event_info {
enum iio_chan_type type;
enum iio_modifier mod;
enum iio_event_direction dir;
} mma9553_events_info[] = {
{
.type = IIO_STEPS,
.mod = IIO_NO_MOD,
.dir = IIO_EV_DIR_NONE,
},
{
.type = IIO_ACTIVITY,
.mod = IIO_MOD_STILL,
.dir = IIO_EV_DIR_RISING,
},
{
.type = IIO_ACTIVITY,
.mod = IIO_MOD_STILL,
.dir = IIO_EV_DIR_FALLING,
},
{
.type = IIO_ACTIVITY,
.mod = IIO_MOD_WALKING,
.dir = IIO_EV_DIR_RISING,
},
{
.type = IIO_ACTIVITY,
.mod = IIO_MOD_WALKING,
.dir = IIO_EV_DIR_FALLING,
},
{
.type = IIO_ACTIVITY,
.mod = IIO_MOD_JOGGING,
.dir = IIO_EV_DIR_RISING,
},
{
.type = IIO_ACTIVITY,
.mod = IIO_MOD_JOGGING,
.dir = IIO_EV_DIR_FALLING,
},
{
.type = IIO_ACTIVITY,
.mod = IIO_MOD_RUNNING,
.dir = IIO_EV_DIR_RISING,
},
{
.type = IIO_ACTIVITY,
.mod = IIO_MOD_RUNNING,
.dir = IIO_EV_DIR_FALLING,
},
};
#define MMA9553_EVENTS_INFO_SIZE ARRAY_SIZE(mma9553_events_info)
struct mma9553_event {
struct mma9553_event_info *info;
bool enabled;
};
struct mma9553_conf_regs {
u16 sleepmin;
u16 sleepmax;
u16 sleepthd;
u16 config;
u16 height_weight;
u16 filter;
u16 speed_step;
u16 actthd;
} __packed;
struct mma9553_data {
struct i2c_client *client;
/*
* 1. Serialize access to HW (requested by mma9551_core API).
* 2. Serialize sequences that power on/off the device and access HW.
*/
struct mutex mutex;
struct mma9553_conf_regs conf;
struct mma9553_event events[MMA9553_EVENTS_INFO_SIZE];
int num_events;
u8 gpio_bitnum;
/*
* This is used for all features that depend on step count:
* step count, distance, speed, calories.
*/
bool stepcnt_enabled;
u16 stepcnt;
u8 activity;
s64 timestamp;
};
static u8 mma9553_get_bits(u16 val, u16 mask)
{
return (val & mask) >> (ffs(mask) - 1);
}
static u16 mma9553_set_bits(u16 current_val, u16 val, u16 mask)
{
return (current_val & ~mask) | (val << (ffs(mask) - 1));
}
static enum iio_modifier mma9553_activity_to_mod(enum activity_level activity)
{
switch (activity) {
case ACTIVITY_RUNNING:
return IIO_MOD_RUNNING;
case ACTIVITY_JOGGING:
return IIO_MOD_JOGGING;
case ACTIVITY_WALKING:
return IIO_MOD_WALKING;
case ACTIVITY_REST:
return IIO_MOD_STILL;
case ACTIVITY_UNKNOWN:
default:
return IIO_NO_MOD;
}
}
static void mma9553_init_events(struct mma9553_data *data)
{
int i;
data->num_events = MMA9553_EVENTS_INFO_SIZE;
for (i = 0; i < data->num_events; i++) {
data->events[i].info = &mma9553_events_info[i];
data->events[i].enabled = false;
}
}
static struct mma9553_event *mma9553_get_event(struct mma9553_data *data,
enum iio_chan_type type,
enum iio_modifier mod,
enum iio_event_direction dir)
{
int i;
for (i = 0; i < data->num_events; i++)
if (data->events[i].info->type == type &&
data->events[i].info->mod == mod &&
data->events[i].info->dir == dir)
return &data->events[i];
return NULL;
}
static bool mma9553_is_any_event_enabled(struct mma9553_data *data,
bool check_type,
enum iio_chan_type type)
{
int i;
for (i = 0; i < data->num_events; i++)
if ((check_type && data->events[i].info->type == type &&
data->events[i].enabled) ||
(!check_type && data->events[i].enabled))
return true;
return false;
}
static int mma9553_set_config(struct mma9553_data *data, u16 reg,
u16 *p_reg_val, u16 val, u16 mask)
{
int ret, retries;
u16 reg_val, config;
reg_val = *p_reg_val;
if (val == mma9553_get_bits(reg_val, mask))
return 0;
reg_val = mma9553_set_bits(reg_val, val, mask);
ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
reg, reg_val);
if (ret < 0) {
dev_err(&data->client->dev,
"error writing config register 0x%x\n", reg);
return ret;
}
*p_reg_val = reg_val;
/* Reinitializes the pedometer with current configuration values */
config = mma9553_set_bits(data->conf.config, 1,
MMA9553_MASK_CONF_CONFIG);
ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
MMA9553_REG_CONF_CONF_STEPLEN, config);
if (ret < 0) {
dev_err(&data->client->dev,
"error writing config register 0x%x\n",
MMA9553_REG_CONF_CONF_STEPLEN);
return ret;
}
retries = MMA9553_CONFIG_RETRIES;
do {
mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
ret = mma9551_read_config_word(data->client,
MMA9551_APPID_PEDOMETER,
MMA9553_REG_CONF_CONF_STEPLEN,
&config);
if (ret < 0)
return ret;
} while (mma9553_get_bits(config, MMA9553_MASK_CONF_CONFIG) &&
--retries > 0);
return 0;
}
static int mma9553_read_activity_stepcnt(struct mma9553_data *data,
u8 *activity, u16 *stepcnt)
{
u16 buf[2];
int ret;
ret = mma9551_read_status_words(data->client, MMA9551_APPID_PEDOMETER,
MMA9553_REG_STATUS, ARRAY_SIZE(buf),
buf);
if (ret < 0) {
dev_err(&data->client->dev,
"error reading status and stepcnt\n");
return ret;
}
*activity = mma9553_get_bits(buf[0], MMA9553_MASK_STATUS_ACTIVITY);
*stepcnt = buf[1];
return 0;
}
static int mma9553_conf_gpio(struct mma9553_data *data)
{
u8 bitnum = 0, appid = MMA9551_APPID_PEDOMETER;
int ret;
struct mma9553_event *ev_step_detect;
bool activity_enabled;
activity_enabled = mma9553_is_any_event_enabled(data, true,
IIO_ACTIVITY);
ev_step_detect = mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD,
IIO_EV_DIR_NONE);
/*
* If both step detector and activity are enabled, use the MRGFL bit.
* This bit is the logical OR of the SUSPCHG, STEPCHG, and ACTCHG flags.
*/
if (activity_enabled && ev_step_detect->enabled)
bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_MRGFL);
else if (ev_step_detect->enabled)
bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_STEPCHG);
else if (activity_enabled)
bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_ACTCHG);
else /* Reset */
appid = MMA9551_APPID_NONE;
if (data->gpio_bitnum == bitnum)
return 0;
/* Save initial values for activity and stepcnt */
if (activity_enabled || ev_step_detect->enabled) {
ret = mma9553_read_activity_stepcnt(data, &data->activity,
&data->stepcnt);
if (ret < 0)
return ret;
}
ret = mma9551_gpio_config(data->client, MMA9553_DEFAULT_GPIO_PIN, appid,
bitnum, MMA9553_DEFAULT_GPIO_POLARITY);
if (ret < 0)
return ret;
data->gpio_bitnum = bitnum;
return 0;
}
static int mma9553_init(struct mma9553_data *data)
{
int ret;
ret = mma9551_read_version(data->client);
if (ret)
return ret;
/*
* Read all the pedometer configuration registers. This is used as
* a device identification command to differentiate the MMA9553L
* from the MMA9550L.
*/
ret = mma9551_read_config_words(data->client, MMA9551_APPID_PEDOMETER,
MMA9553_REG_CONF_SLEEPMIN,
sizeof(data->conf) / sizeof(u16),
(u16 *)&data->conf);
if (ret < 0) {
dev_err(&data->client->dev,
"failed to read configuration registers\n");
return ret;
}
/* Reset GPIO */
data->gpio_bitnum = MMA9553_MAX_BITNUM;
ret = mma9553_conf_gpio(data);
if (ret < 0)
return ret;
ret = mma9551_app_reset(data->client, MMA9551_RSC_PED);
if (ret < 0)
return ret;
/* Init config registers */
data->conf.sleepmin = MMA9553_DEFAULT_SLEEPMIN;
data->conf.sleepmax = MMA9553_DEFAULT_SLEEPMAX;
data->conf.sleepthd = MMA9553_DEFAULT_SLEEPTHD;
data->conf.config = mma9553_set_bits(data->conf.config, 1,
MMA9553_MASK_CONF_CONFIG);
/*
* Clear the activity debounce counter when the activity level changes,
* so that the confidence level applies for any activity level.
*/
data->conf.config = mma9553_set_bits(data->conf.config, 1,
MMA9553_MASK_CONF_ACT_DBCNTM);
ret = mma9551_write_config_words(data->client, MMA9551_APPID_PEDOMETER,
MMA9553_REG_CONF_SLEEPMIN,
sizeof(data->conf) / sizeof(u16),
(u16 *)&data->conf);
if (ret < 0) {
dev_err(&data->client->dev,
"failed to write configuration registers\n");
return ret;
}
return mma9551_set_device_state(data->client, true);
}
static int mma9553_read_status_word(struct mma9553_data *data, u16 reg,
u16 *tmp)
{
bool powered_on;
int ret;
/*
* The HW only counts steps and other dependent
* parameters (speed, distance, calories, activity)
* if power is on (from enabling an event or the
* step counter).
*/
powered_on = mma9553_is_any_event_enabled(data, false, 0) ||
data->stepcnt_enabled;
if (!powered_on) {
dev_err(&data->client->dev, "No channels enabled\n");
return -EINVAL;
}
mutex_lock(&data->mutex);
ret = mma9551_read_status_word(data->client, MMA9551_APPID_PEDOMETER,
reg, tmp);
mutex_unlock(&data->mutex);
return ret;
}
static int mma9553_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct mma9553_data *data = iio_priv(indio_dev);
int ret;
u16 tmp;
u8 activity;
switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
switch (chan->type) {
case IIO_STEPS:
ret = mma9553_read_status_word(data,
MMA9553_REG_STEPCNT,
&tmp);
if (ret < 0)
return ret;
*val = tmp;
return IIO_VAL_INT;
case IIO_DISTANCE:
ret = mma9553_read_status_word(data,
MMA9553_REG_DISTANCE,
&tmp);
if (ret < 0)
return ret;
*val = tmp;
return IIO_VAL_INT;
case IIO_ACTIVITY:
ret = mma9553_read_status_word(data,
MMA9553_REG_STATUS,
&tmp);
if (ret < 0)
return ret;
activity =
mma9553_get_bits(tmp, MMA9553_MASK_STATUS_ACTIVITY);
/*
* The device does not support confidence value levels,
* so we will always have 100% for current activity and
* 0% for the others.
*/
if (chan->channel2 == mma9553_activity_to_mod(activity))
*val = 100;
else
*val = 0;
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_VELOCITY: /* m/h */
if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
return -EINVAL;
ret = mma9553_read_status_word(data,
MMA9553_REG_SPEED,
&tmp);
if (ret < 0)
return ret;
*val = tmp;
return IIO_VAL_INT;
case IIO_ENERGY: /* Cal or kcal */
ret = mma9553_read_status_word(data,
MMA9553_REG_CALORIES,
&tmp);
if (ret < 0)
return ret;
*val = tmp;
return IIO_VAL_INT;
case IIO_ACCEL:
mutex_lock(&data->mutex);
ret = mma9551_read_accel_chan(data->client,
chan, val, val2);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_VELOCITY: /* m/h to m/s */
if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
return -EINVAL;
*val = 0;
*val2 = 277; /* 0.000277 */
return IIO_VAL_INT_PLUS_MICRO;
case IIO_ENERGY: /* Cal or kcal to J */
*val = 4184;
return IIO_VAL_INT;
case IIO_ACCEL:
return mma9551_read_accel_scale(val, val2);
default:
return -EINVAL;
}
case IIO_CHAN_INFO_ENABLE:
*val = data->stepcnt_enabled;
return IIO_VAL_INT;
case IIO_CHAN_INFO_CALIBHEIGHT:
tmp = mma9553_get_bits(data->conf.height_weight,
MMA9553_MASK_CONF_HEIGHT);
*val = tmp / 100; /* cm to m */
*val2 = (tmp % 100) * 10000;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_CALIBWEIGHT:
*val = mma9553_get_bits(data->conf.height_weight,
MMA9553_MASK_CONF_WEIGHT);
return IIO_VAL_INT;
case IIO_CHAN_INFO_DEBOUNCE_COUNT:
switch (chan->type) {
case IIO_STEPS:
*val = mma9553_get_bits(data->conf.filter,
MMA9553_MASK_CONF_FILTSTEP);
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_DEBOUNCE_TIME:
switch (chan->type) {
case IIO_STEPS:
*val = mma9553_get_bits(data->conf.filter,
MMA9553_MASK_CONF_FILTTIME);
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_INT_TIME:
switch (chan->type) {
case IIO_VELOCITY:
if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
return -EINVAL;
*val = mma9553_get_bits(data->conf.speed_step,
MMA9553_MASK_CONF_SPDPRD);
return IIO_VAL_INT;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static int mma9553_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct mma9553_data *data = iio_priv(indio_dev);
int ret, tmp;
switch (mask) {
case IIO_CHAN_INFO_ENABLE:
if (data->stepcnt_enabled == !!val)
return 0;
mutex_lock(&data->mutex);
ret = mma9551_set_power_state(data->client, val);
if (ret < 0) {
mutex_unlock(&data->mutex);
return ret;
}
data->stepcnt_enabled = val;
mutex_unlock(&data->mutex);
return 0;
case IIO_CHAN_INFO_CALIBHEIGHT:
/* m to cm */
tmp = val * 100 + val2 / 10000;
if (tmp < 0 || tmp > 255)
return -EINVAL;
mutex_lock(&data->mutex);
ret = mma9553_set_config(data,
MMA9553_REG_CONF_HEIGHT_WEIGHT,
&data->conf.height_weight,
tmp, MMA9553_MASK_CONF_HEIGHT);
mutex_unlock(&data->mutex);
return ret;
case IIO_CHAN_INFO_CALIBWEIGHT:
if (val < 0 || val > 255)
return -EINVAL;
mutex_lock(&data->mutex);
ret = mma9553_set_config(data,
MMA9553_REG_CONF_HEIGHT_WEIGHT,
&data->conf.height_weight,
val, MMA9553_MASK_CONF_WEIGHT);
mutex_unlock(&data->mutex);
return ret;
case IIO_CHAN_INFO_DEBOUNCE_COUNT:
switch (chan->type) {
case IIO_STEPS:
/*
* Set to 0 to disable step filtering. If the value
* specified is greater than 6, then 6 will be used.
*/
if (val < 0)
return -EINVAL;
if (val > 6)
val = 6;
mutex_lock(&data->mutex);
ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
&data->conf.filter, val,
MMA9553_MASK_CONF_FILTSTEP);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_DEBOUNCE_TIME:
switch (chan->type) {
case IIO_STEPS:
if (val < 0 || val > 127)
return -EINVAL;
mutex_lock(&data->mutex);
ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
&data->conf.filter, val,
MMA9553_MASK_CONF_FILTTIME);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_INT_TIME:
switch (chan->type) {
case IIO_VELOCITY:
if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
return -EINVAL;
/*
* If set to a value greater than 5, then 5 will be
* used. Warning: Do not set SPDPRD to 0 or 1 as
* this may cause undesirable behavior.
*/
if (val < 2)
return -EINVAL;
if (val > 5)
val = 5;
mutex_lock(&data->mutex);
ret = mma9553_set_config(data,
MMA9553_REG_CONF_SPEED_STEP,
&data->conf.speed_step, val,
MMA9553_MASK_CONF_SPDPRD);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static int mma9553_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 mma9553_data *data = iio_priv(indio_dev);
struct mma9553_event *event;
event = mma9553_get_event(data, chan->type, chan->channel2, dir);
if (!event)
return -EINVAL;
return event->enabled;
}
static int mma9553_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 mma9553_data *data = iio_priv(indio_dev);
struct mma9553_event *event;
int ret;
event = mma9553_get_event(data, chan->type, chan->channel2, dir);
if (!event)
return -EINVAL;
if (event->enabled == state)
return 0;
mutex_lock(&data->mutex);
ret = mma9551_set_power_state(data->client, state);
if (ret < 0)
goto err_out;
event->enabled = state;
ret = mma9553_conf_gpio(data);
if (ret < 0)
goto err_conf_gpio;
mutex_unlock(&data->mutex);
return 0;
err_conf_gpio:
if (state) {
event->enabled = false;
mma9551_set_power_state(data->client, false);
}
err_out:
mutex_unlock(&data->mutex);
return ret;
}
static int mma9553_read_event_value(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 mma9553_data *data = iio_priv(indio_dev);
*val2 = 0;
switch (info) {
case IIO_EV_INFO_VALUE:
switch (chan->type) {
case IIO_STEPS:
*val = mma9553_get_bits(data->conf.speed_step,
MMA9553_MASK_CONF_STEPCOALESCE);
return IIO_VAL_INT;
case IIO_ACTIVITY:
/*
* The device does not support confidence value levels.
* We set an average of 50%.
*/
*val = 50;
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_EV_INFO_PERIOD:
switch (chan->type) {
case IIO_ACTIVITY:
*val = MMA9553_ACTIVITY_THD_TO_SEC(data->conf.actthd);
return IIO_VAL_INT;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static int mma9553_write_event_value(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 mma9553_data *data = iio_priv(indio_dev);
int ret;
switch (info) {
case IIO_EV_INFO_VALUE:
switch (chan->type) {
case IIO_STEPS:
if (val < 0 || val > 255)
return -EINVAL;
mutex_lock(&data->mutex);
ret = mma9553_set_config(data,
MMA9553_REG_CONF_SPEED_STEP,
&data->conf.speed_step, val,
MMA9553_MASK_CONF_STEPCOALESCE);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
case IIO_EV_INFO_PERIOD:
switch (chan->type) {
case IIO_ACTIVITY:
if (val < 0 || val > MMA9553_ACTIVITY_THD_TO_SEC(
MMA9553_MAX_ACTTHD))
return -EINVAL;
mutex_lock(&data->mutex);
ret = mma9553_set_config(data, MMA9553_REG_CONF_ACTTHD,
&data->conf.actthd,
MMA9553_ACTIVITY_SEC_TO_THD
(val), MMA9553_MASK_CONF_WORD);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static int mma9553_get_calibgender_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct mma9553_data *data = iio_priv(indio_dev);
u8 gender;
gender = mma9553_get_bits(data->conf.filter, MMA9553_MASK_CONF_MALE);
/*
* HW expects 0 for female and 1 for male,
* while iio index is 0 for male and 1 for female.
*/
return !gender;
}
static int mma9553_set_calibgender_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
unsigned int mode)
{
struct mma9553_data *data = iio_priv(indio_dev);
u8 gender = !mode;
int ret;
if ((mode != 0) && (mode != 1))
return -EINVAL;
mutex_lock(&data->mutex);
ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
&data->conf.filter, gender,
MMA9553_MASK_CONF_MALE);
mutex_unlock(&data->mutex);
return ret;
}
static const struct iio_event_spec mma9553_step_event = {
.type = IIO_EV_TYPE_CHANGE,
.dir = IIO_EV_DIR_NONE,
.mask_separate = BIT(IIO_EV_INFO_ENABLE) | BIT(IIO_EV_INFO_VALUE),
};
static const struct iio_event_spec mma9553_activity_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_PERIOD),
},
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_PERIOD),
},
};
static const char * const mma9553_calibgender_modes[] = { "male", "female" };
static const struct iio_enum mma9553_calibgender_enum = {
.items = mma9553_calibgender_modes,
.num_items = ARRAY_SIZE(mma9553_calibgender_modes),
.get = mma9553_get_calibgender_mode,
.set = mma9553_set_calibgender_mode,
};
static const struct iio_chan_spec_ext_info mma9553_ext_info[] = {
IIO_ENUM("calibgender", IIO_SHARED_BY_TYPE, &mma9553_calibgender_enum),
IIO_ENUM_AVAILABLE("calibgender", &mma9553_calibgender_enum),
{},
};
#define MMA9553_PEDOMETER_CHANNEL(_type, _mask) { \
.type = _type, \
.info_mask_separate = BIT(IIO_CHAN_INFO_ENABLE) | \
BIT(IIO_CHAN_INFO_CALIBHEIGHT) | \
_mask, \
.ext_info = mma9553_ext_info, \
}
#define MMA9553_ACTIVITY_CHANNEL(_chan2) { \
.type = IIO_ACTIVITY, \
.modified = 1, \
.channel2 = _chan2, \
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT) | \
BIT(IIO_CHAN_INFO_ENABLE), \
.event_spec = mma9553_activity_events, \
.num_event_specs = ARRAY_SIZE(mma9553_activity_events), \
.ext_info = mma9553_ext_info, \
}
static const struct iio_chan_spec mma9553_channels[] = {
MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
{
.type = IIO_STEPS,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
BIT(IIO_CHAN_INFO_ENABLE) |
BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT) |
BIT(IIO_CHAN_INFO_DEBOUNCE_TIME),
.event_spec = &mma9553_step_event,
.num_event_specs = 1,
},
MMA9553_PEDOMETER_CHANNEL(IIO_DISTANCE, BIT(IIO_CHAN_INFO_PROCESSED)),
{
.type = IIO_VELOCITY,
.modified = 1,
.channel2 = IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_ENABLE),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT),
.ext_info = mma9553_ext_info,
},
MMA9553_PEDOMETER_CHANNEL(IIO_ENERGY, BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_CALIBWEIGHT)),
MMA9553_ACTIVITY_CHANNEL(IIO_MOD_RUNNING),
MMA9553_ACTIVITY_CHANNEL(IIO_MOD_JOGGING),
MMA9553_ACTIVITY_CHANNEL(IIO_MOD_WALKING),
MMA9553_ACTIVITY_CHANNEL(IIO_MOD_STILL),
};
static const struct iio_info mma9553_info = {
.driver_module = THIS_MODULE,
.read_raw = mma9553_read_raw,
.write_raw = mma9553_write_raw,
.read_event_config = mma9553_read_event_config,
.write_event_config = mma9553_write_event_config,
.read_event_value = mma9553_read_event_value,
.write_event_value = mma9553_write_event_value,
};
static irqreturn_t mma9553_irq_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct mma9553_data *data = iio_priv(indio_dev);
data->timestamp = iio_get_time_ns();
/*
* Since we only configure the interrupt pin when an
* event is enabled, we are sure we have at least
* one event enabled at this point.
*/
return IRQ_WAKE_THREAD;
}
static irqreturn_t mma9553_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct mma9553_data *data = iio_priv(indio_dev);
u16 stepcnt;
u8 activity;
struct mma9553_event *ev_activity, *ev_prev_activity, *ev_step_detect;
int ret;
mutex_lock(&data->mutex);
ret = mma9553_read_activity_stepcnt(data, &activity, &stepcnt);
if (ret < 0) {
mutex_unlock(&data->mutex);
return IRQ_HANDLED;
}
ev_prev_activity = mma9553_get_event(data, IIO_ACTIVITY,
mma9553_activity_to_mod(
data->activity),
IIO_EV_DIR_FALLING);
ev_activity = mma9553_get_event(data, IIO_ACTIVITY,
mma9553_activity_to_mod(activity),
IIO_EV_DIR_RISING);
ev_step_detect = mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD,
IIO_EV_DIR_NONE);
if (ev_step_detect->enabled && (stepcnt != data->stepcnt)) {
data->stepcnt = stepcnt;
iio_push_event(indio_dev,
IIO_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD,
IIO_EV_DIR_NONE,
IIO_EV_TYPE_CHANGE, 0, 0, 0),
data->timestamp);
}
if (activity != data->activity) {
data->activity = activity;
/* ev_activity can be NULL if activity == ACTIVITY_UNKNOWN */
if (ev_prev_activity && ev_prev_activity->enabled)
iio_push_event(indio_dev,
IIO_EVENT_CODE(IIO_ACTIVITY, 0,
ev_prev_activity->info->mod,
IIO_EV_DIR_FALLING,
IIO_EV_TYPE_THRESH, 0, 0,
0),
data->timestamp);
if (ev_activity && ev_activity->enabled)
iio_push_event(indio_dev,
IIO_EVENT_CODE(IIO_ACTIVITY, 0,
ev_activity->info->mod,
IIO_EV_DIR_RISING,
IIO_EV_TYPE_THRESH, 0, 0,
0),
data->timestamp);
}
mutex_unlock(&data->mutex);
return IRQ_HANDLED;
}
static int mma9553_gpio_probe(struct i2c_client *client)
{
struct device *dev;
struct gpio_desc *gpio;
int ret;
if (!client)
return -EINVAL;
dev = &client->dev;
/* data ready GPIO interrupt pin */
gpio = devm_gpiod_get_index(dev, MMA9553_GPIO_NAME, 0, GPIOD_IN);
if (IS_ERR(gpio)) {
dev_err(dev, "ACPI GPIO get index failed\n");
return PTR_ERR(gpio);
}
ret = gpiod_to_irq(gpio);
dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
return ret;
}
static const char *mma9553_match_acpi_device(struct device *dev)
{
const struct acpi_device_id *id;
id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!id)
return NULL;
return dev_name(dev);
}
static int mma9553_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct mma9553_data *data;
struct iio_dev *indio_dev;
const char *name = NULL;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
if (id)
name = id->name;
else if (ACPI_HANDLE(&client->dev))
name = mma9553_match_acpi_device(&client->dev);
else
return -ENOSYS;
mutex_init(&data->mutex);
mma9553_init_events(data);
ret = mma9553_init(data);
if (ret < 0)
return ret;
indio_dev->dev.parent = &client->dev;
indio_dev->channels = mma9553_channels;
indio_dev->num_channels = ARRAY_SIZE(mma9553_channels);
indio_dev->name = name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &mma9553_info;
if (client->irq < 0)
client->irq = mma9553_gpio_probe(client);
if (client->irq > 0) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
mma9553_irq_handler,
mma9553_event_handler,
IRQF_TRIGGER_RISING,
MMA9553_IRQ_NAME, indio_dev);
if (ret < 0) {
dev_err(&client->dev, "request irq %d failed\n",
client->irq);
goto out_poweroff;
}
}
ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(&client->dev, "unable to register iio device\n");
goto out_poweroff;
}
ret = pm_runtime_set_active(&client->dev);
if (ret < 0)
goto out_iio_unregister;
pm_runtime_enable(&client->dev);
pm_runtime_set_autosuspend_delay(&client->dev,
MMA9551_AUTO_SUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&client->dev);
dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
return 0;
out_iio_unregister:
iio_device_unregister(indio_dev);
out_poweroff:
mma9551_set_device_state(client, false);
return ret;
}
static int mma9553_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct mma9553_data *data = iio_priv(indio_dev);
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);
pm_runtime_put_noidle(&client->dev);
iio_device_unregister(indio_dev);
mutex_lock(&data->mutex);
mma9551_set_device_state(data->client, false);
mutex_unlock(&data->mutex);
return 0;
}
#ifdef CONFIG_PM
static int mma9553_runtime_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct mma9553_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = mma9551_set_device_state(data->client, false);
mutex_unlock(&data->mutex);
if (ret < 0) {
dev_err(&data->client->dev, "powering off device failed\n");
return -EAGAIN;
}
return 0;
}
static int mma9553_runtime_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct mma9553_data *data = iio_priv(indio_dev);
int ret;
ret = mma9551_set_device_state(data->client, true);
if (ret < 0)
return ret;
mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
return 0;
}
#endif
#ifdef CONFIG_PM_SLEEP
static int mma9553_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct mma9553_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = mma9551_set_device_state(data->client, false);
mutex_unlock(&data->mutex);
return ret;
}
static int mma9553_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct mma9553_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = mma9551_set_device_state(data->client, true);
mutex_unlock(&data->mutex);
return ret;
}
#endif
static const struct dev_pm_ops mma9553_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mma9553_suspend, mma9553_resume)
SET_RUNTIME_PM_OPS(mma9553_runtime_suspend,
mma9553_runtime_resume, NULL)
};
static const struct acpi_device_id mma9553_acpi_match[] = {
{"MMA9553", 0},
{},
};
MODULE_DEVICE_TABLE(acpi, mma9553_acpi_match);
static const struct i2c_device_id mma9553_id[] = {
{"mma9553", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, mma9553_id);
static struct i2c_driver mma9553_driver = {
.driver = {
.name = MMA9553_DRV_NAME,
.acpi_match_table = ACPI_PTR(mma9553_acpi_match),
.pm = &mma9553_pm_ops,
},
.probe = mma9553_probe,
.remove = mma9553_remove,
.id_table = mma9553_id,
};
module_i2c_driver(mma9553_driver);
MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MMA9553L pedometer platform driver");