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iio:proximity:sx9310: Extract common Semtech sensor logic 

Before adding new Semtech sensors, move common logic to all Semtech SAR
sensor in its own file:
- interface with IIO subsystem,
- interrupt management,
- channel access conrol,
- event processing.

The change adds a bidirectional interface between sx93xx and sx_common.

The change is quite mechanical, as the impacted functions are moved
and renamed.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20220101203817.290512-3-gwendal@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Gwendal Grignou 2022-01-01 12:38:14 -08:00 коммит произвёл Jonathan Cameron
Родитель fc5d805e12
Коммит caa8ce7f61
5 изменённых файлов: 845 добавлений и 607 удалений
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6
drivers/iio/proximity/Kconfig
Просмотреть файл

@ -112,11 +112,17 @@ config SRF04
To compile this driver as a module, choose M here: the
module will be called srf04.
config SX_COMMON
tristate
help
Common Semtech proximity sensor code.
config SX9310
tristate "SX9310/SX9311 Semtech proximity sensor"
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
select REGMAP_I2C
select SX_COMMON
depends on I2C
help
Say Y here to build a driver for Semtech's SX9310/SX9311 capacitive

1
drivers/iio/proximity/Makefile
Просмотреть файл

@ -14,6 +14,7 @@ obj-$(CONFIG_RFD77402) += rfd77402.o
obj-$(CONFIG_SRF04) += srf04.o
obj-$(CONFIG_SRF08) += srf08.o
obj-$(CONFIG_SX9310) += sx9310.o
obj-$(CONFIG_SX_COMMON) += sx_common.o
obj-$(CONFIG_SX9500) += sx9500.o
obj-$(CONFIG_VCNL3020) += vcnl3020.o
obj-$(CONFIG_VL53L0X_I2C) += vl53l0x-i2c.o

668
drivers/iio/proximity/sx9310.c
Просмотреть файл

@ -10,11 +10,10 @@
* and in January 2020 by Daniel Campello <campello@chromium.org>.
*/
#include <linux/acpi.h>
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/mod_devicetable.h>
@ -22,19 +21,12 @@
#include <linux/pm.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/iio/buffer.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#include "sx_common.h"
/* Register definitions. */
#define SX9310_REG_IRQ_SRC 0x00
#define SX9310_REG_IRQ_SRC SX_COMMON_REG_IRQ_SRC
#define SX9310_REG_STAT0 0x01
#define SX9310_REG_STAT1 0x02
#define SX9310_REG_STAT1_COMPSTAT_MASK GENMASK(3, 0)
@ -135,58 +127,11 @@
#define SX9310_WHOAMI_VALUE 0x01
#define SX9311_WHOAMI_VALUE 0x02
#define SX9310_REG_RESET 0x7f
#define SX9310_SOFT_RESET 0xde
/* 4 hardware channels, as defined in STAT0: COMB, CS2, CS1 and CS0. */
#define SX9310_NUM_CHANNELS 4
static_assert(SX9310_NUM_CHANNELS < BITS_PER_LONG);
struct sx9310_data {
/* Serialize access to registers and channel configuration */
struct mutex mutex;
struct i2c_client *client;
struct iio_trigger *trig;
struct regmap *regmap;
struct regulator_bulk_data supplies[2];
/*
* Last reading of the proximity status for each channel.
* We only send an event to user space when this changes.
*/
unsigned long chan_prox_stat;
bool trigger_enabled;
/* Ensure correct alignment of timestamp when present. */
struct {
__be16 channels[SX9310_NUM_CHANNELS];
s64 ts __aligned(8);
} buffer;
/* Remember enabled channels and sample rate during suspend. */
unsigned int suspend_ctrl0;
struct completion completion;
unsigned long chan_read;
unsigned long chan_event;
unsigned int whoami;
};
static const struct iio_event_spec sx9310_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD),
},
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD),
},
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_HYSTERESIS) |
BIT(IIO_EV_INFO_VALUE),
},
};
static_assert(SX9310_NUM_CHANNELS <= SX_COMMON_MAX_NUM_CHANNELS);
#define SX9310_NAMED_CHANNEL(idx, name) \
{ \
@ -202,8 +147,8 @@ static const struct iio_event_spec sx9310_events[] = {
.channel = idx, \
.extend_name = name, \
.address = SX9310_REG_DIFF_MSB, \
.event_spec = sx9310_events, \
.num_event_specs = ARRAY_SIZE(sx9310_events), \
.event_spec = sx_common_events, \
.num_event_specs = ARRAY_SIZE(sx_common_events), \
.scan_index = idx, \
.scan_type = { \
.sign = 's', \
@ -306,64 +251,7 @@ static const struct regmap_config sx9310_regmap_config = {
.volatile_table = &sx9310_volatile_regs,
};
static int sx9310_update_chan_en(struct sx9310_data *data,
unsigned long chan_read,
unsigned long chan_event)
{
int ret;
unsigned long channels = chan_read | chan_event;
if ((data->chan_read | data->chan_event) != channels) {
ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL0,
SX9310_REG_PROX_CTRL0_SENSOREN_MASK,
channels);
if (ret)
return ret;
}
data->chan_read = chan_read;
data->chan_event = chan_event;
return 0;
}
static int sx9310_get_read_channel(struct sx9310_data *data, int channel)
{
return sx9310_update_chan_en(data, data->chan_read | BIT(channel),
data->chan_event);
}
static int sx9310_put_read_channel(struct sx9310_data *data, int channel)
{
return sx9310_update_chan_en(data, data->chan_read & ~BIT(channel),
data->chan_event);
}
static int sx9310_get_event_channel(struct sx9310_data *data, int channel)
{
return sx9310_update_chan_en(data, data->chan_read,
data->chan_event | BIT(channel));
}
static int sx9310_put_event_channel(struct sx9310_data *data, int channel)
{
return sx9310_update_chan_en(data, data->chan_read,
data->chan_event & ~BIT(channel));
}
static int sx9310_enable_irq(struct sx9310_data *data, unsigned int irq)
{
if (!data->client->irq)
return 0;
return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, irq);
}
static int sx9310_disable_irq(struct sx9310_data *data, unsigned int irq)
{
if (!data->client->irq)
return 0;
return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, 0);
}
static int sx9310_read_prox_data(struct sx9310_data *data,
static int sx9310_read_prox_data(struct sx_common_data *data,
const struct iio_chan_spec *chan, __be16 *val)
{
int ret;
@ -379,7 +267,7 @@ static int sx9310_read_prox_data(struct sx9310_data *data,
* If we have no interrupt support, we have to wait for a scan period
* after enabling a channel to get a result.
*/
static int sx9310_wait_for_sample(struct sx9310_data *data)
static int sx9310_wait_for_sample(struct sx_common_data *data)
{
int ret;
unsigned int val;
@ -395,66 +283,7 @@ static int sx9310_wait_for_sample(struct sx9310_data *data)
return 0;
}
static int sx9310_read_proximity(struct sx9310_data *data,
const struct iio_chan_spec *chan, int *val)
{
int ret;
__be16 rawval;
mutex_lock(&data->mutex);
ret = sx9310_get_read_channel(data, chan->channel);
if (ret)
goto out;
ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ);
if (ret)
goto out_put_channel;
mutex_unlock(&data->mutex);
if (data->client->irq) {
ret = wait_for_completion_interruptible(&data->completion);
reinit_completion(&data->completion);
} else {
ret = sx9310_wait_for_sample(data);
}
mutex_lock(&data->mutex);
if (ret)
goto out_disable_irq;
ret = sx9310_read_prox_data(data, chan, &rawval);
if (ret)
goto out_disable_irq;
*val = sign_extend32(be16_to_cpu(rawval),
chan->address == SX9310_REG_DIFF_MSB ? 11 : 15);
ret = sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
if (ret)
goto out_put_channel;
ret = sx9310_put_read_channel(data, chan->channel);
if (ret)
goto out;
mutex_unlock(&data->mutex);
return IIO_VAL_INT;
out_disable_irq:
sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
out_put_channel:
sx9310_put_read_channel(data, chan->channel);
out:
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_read_gain(struct sx9310_data *data,
static int sx9310_read_gain(struct sx_common_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int regval, gain;
@ -482,7 +311,7 @@ static int sx9310_read_gain(struct sx9310_data *data,
return IIO_VAL_INT;
}
static int sx9310_read_samp_freq(struct sx9310_data *data, int *val, int *val2)
static int sx9310_read_samp_freq(struct sx_common_data *data, int *val, int *val2)
{
unsigned int regval;
int ret;
@ -502,7 +331,7 @@ static int sx9310_read_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int *val,
int *val2, long mask)
{
struct sx9310_data *data = iio_priv(indio_dev);
struct sx_common_data *data = iio_priv(indio_dev);
int ret;
if (chan->type != IIO_PROXIMITY)
@ -514,7 +343,7 @@ static int sx9310_read_raw(struct iio_dev *indio_dev,
if (ret)
return ret;
ret = sx9310_read_proximity(data, chan, val);
ret = sx_common_read_proximity(data, chan, val);
iio_device_release_direct_mode(indio_dev);
return ret;
case IIO_CHAN_INFO_HARDWAREGAIN:
@ -553,10 +382,10 @@ static int sx9310_read_avail(struct iio_dev *indio_dev,
*length = ARRAY_SIZE(sx9310_samp_freq_table) * 2;
*vals = (int *)sx9310_samp_freq_table;
return IIO_AVAIL_LIST;
}
default:
return -EINVAL;
}
}
static const unsigned int sx9310_pthresh_codes[] = {
2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 40, 48, 56, 64, 72, 80, 88, 96, 112,
@ -572,12 +401,12 @@ static int sx9310_get_thresh_reg(unsigned int channel)
case 1:
case 2:
return SX9310_REG_PROX_CTRL9;
}
default:
return -EINVAL;
}
}
static int sx9310_read_thresh(struct sx9310_data *data,
static int sx9310_read_thresh(struct sx_common_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int reg;
@ -600,7 +429,7 @@ static int sx9310_read_thresh(struct sx9310_data *data,
return IIO_VAL_INT;
}
static int sx9310_read_hysteresis(struct sx9310_data *data,
static int sx9310_read_hysteresis(struct sx_common_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int regval, pthresh;
@ -624,7 +453,7 @@ static int sx9310_read_hysteresis(struct sx9310_data *data,
return IIO_VAL_INT;
}
static int sx9310_read_far_debounce(struct sx9310_data *data, int *val)
static int sx9310_read_far_debounce(struct sx_common_data *data, int *val)
{
unsigned int regval;
int ret;
@ -642,7 +471,7 @@ static int sx9310_read_far_debounce(struct sx9310_data *data, int *val)
return IIO_VAL_INT;
}
static int sx9310_read_close_debounce(struct sx9310_data *data, int *val)
static int sx9310_read_close_debounce(struct sx_common_data *data, int *val)
{
unsigned int regval;
int ret;
@ -666,7 +495,7 @@ static int sx9310_read_event_val(struct iio_dev *indio_dev,
enum iio_event_direction dir,
enum iio_event_info info, int *val, int *val2)
{
struct sx9310_data *data = iio_priv(indio_dev);
struct sx_common_data *data = iio_priv(indio_dev);
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
@ -690,7 +519,7 @@ static int sx9310_read_event_val(struct iio_dev *indio_dev,
}
}
static int sx9310_write_thresh(struct sx9310_data *data,
static int sx9310_write_thresh(struct sx_common_data *data,
const struct iio_chan_spec *chan, int val)
{
unsigned int reg;
@ -720,7 +549,7 @@ static int sx9310_write_thresh(struct sx9310_data *data,
return ret;
}
static int sx9310_write_hysteresis(struct sx9310_data *data,
static int sx9310_write_hysteresis(struct sx_common_data *data,
const struct iio_chan_spec *chan, int _val)
{
unsigned int hyst, val = _val;
@ -750,7 +579,7 @@ static int sx9310_write_hysteresis(struct sx9310_data *data,
return ret;
}
static int sx9310_write_far_debounce(struct sx9310_data *data, int val)
static int sx9310_write_far_debounce(struct sx_common_data *data, int val)
{
int ret;
unsigned int regval;
@ -771,7 +600,7 @@ static int sx9310_write_far_debounce(struct sx9310_data *data, int val)
return ret;
}
static int sx9310_write_close_debounce(struct sx9310_data *data, int val)
static int sx9310_write_close_debounce(struct sx_common_data *data, int val)
{
int ret;
unsigned int regval;
@ -798,7 +627,7 @@ static int sx9310_write_event_val(struct iio_dev *indio_dev,
enum iio_event_direction dir,
enum iio_event_info info, int val, int val2)
{
struct sx9310_data *data = iio_priv(indio_dev);
struct sx_common_data *data = iio_priv(indio_dev);
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
@ -822,7 +651,7 @@ static int sx9310_write_event_val(struct iio_dev *indio_dev,
}
}
static int sx9310_set_samp_freq(struct sx9310_data *data, int val, int val2)
static int sx9310_set_samp_freq(struct sx_common_data *data, int val, int val2)
{
int i, ret;
@ -846,7 +675,7 @@ static int sx9310_set_samp_freq(struct sx9310_data *data, int val, int val2)
return ret;
}
static int sx9310_write_gain(struct sx9310_data *data,
static int sx9310_write_gain(struct sx_common_data *data,
const struct iio_chan_spec *chan, int val)
{
unsigned int gain, mask;
@ -881,7 +710,7 @@ static int sx9310_write_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int val, int val2,
long mask)
{
struct sx9310_data *data = iio_priv(indio_dev);
struct sx_common_data *data = iio_priv(indio_dev);
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
@ -891,243 +720,12 @@ static int sx9310_write_raw(struct iio_dev *indio_dev,
return sx9310_set_samp_freq(data, val, val2);
case IIO_CHAN_INFO_HARDWAREGAIN:
return sx9310_write_gain(data, chan, val);
}
default:
return -EINVAL;
}
static irqreturn_t sx9310_irq_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct sx9310_data *data = iio_priv(indio_dev);
if (data->trigger_enabled)
iio_trigger_poll(data->trig);
/*
* Even if no event is enabled, we need to wake the thread to clear the
* interrupt state by reading SX9310_REG_IRQ_SRC.
* It is not possible to do that here because regmap_read takes a mutex.
*/
return IRQ_WAKE_THREAD;
}
static void sx9310_push_events(struct iio_dev *indio_dev)
{
int ret;
unsigned int val, chan;
struct sx9310_data *data = iio_priv(indio_dev);
s64 timestamp = iio_get_time_ns(indio_dev);
unsigned long prox_changed;
/* Read proximity state on all channels */
ret = regmap_read(data->regmap, SX9310_REG_STAT0, &val);
if (ret) {
dev_err(&data->client->dev, "i2c transfer error in irq\n");
return;
}
/*
* Only iterate over channels with changes on proximity status that have
* events enabled.
*/
prox_changed = (data->chan_prox_stat ^ val) & data->chan_event;
for_each_set_bit(chan, &prox_changed, SX9310_NUM_CHANNELS) {
int dir;
u64 ev;
dir = (val & BIT(chan)) ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan,
IIO_EV_TYPE_THRESH, dir);
iio_push_event(indio_dev, ev, timestamp);
}
data->chan_prox_stat = val;
}
static irqreturn_t sx9310_irq_thread_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct sx9310_data *data = iio_priv(indio_dev);
int ret;
unsigned int val;
mutex_lock(&data->mutex);
ret = regmap_read(data->regmap, SX9310_REG_IRQ_SRC, &val);
if (ret) {
dev_err(&data->client->dev, "i2c transfer error in irq\n");
goto out;
}
if (val & (SX9310_FAR_IRQ | SX9310_CLOSE_IRQ))
sx9310_push_events(indio_dev);
if (val & SX9310_CONVDONE_IRQ)
complete(&data->completion);
out:
mutex_unlock(&data->mutex);
return IRQ_HANDLED;
}
static int sx9310_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 sx9310_data *data = iio_priv(indio_dev);
return !!(data->chan_event & BIT(chan->channel));
}
static int sx9310_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 sx9310_data *data = iio_priv(indio_dev);
unsigned int eventirq = SX9310_FAR_IRQ | SX9310_CLOSE_IRQ;
int ret;
/* If the state hasn't changed, there's nothing to do. */
if (!!(data->chan_event & BIT(chan->channel)) == state)
return 0;
mutex_lock(&data->mutex);
if (state) {
ret = sx9310_get_event_channel(data, chan->channel);
if (ret)
goto out_unlock;
if (!(data->chan_event & ~BIT(chan->channel))) {
ret = sx9310_enable_irq(data, eventirq);
if (ret)
sx9310_put_event_channel(data, chan->channel);
}
} else {
ret = sx9310_put_event_channel(data, chan->channel);
if (ret)
goto out_unlock;
if (!data->chan_event) {
ret = sx9310_disable_irq(data, eventirq);
if (ret)
sx9310_get_event_channel(data, chan->channel);
}
}
out_unlock:
mutex_unlock(&data->mutex);
return ret;
}
static const struct iio_info sx9310_info = {
.read_raw = sx9310_read_raw,
.read_avail = sx9310_read_avail,
.read_event_value = sx9310_read_event_val,
.write_event_value = sx9310_write_event_val,
.write_raw = sx9310_write_raw,
.read_event_config = sx9310_read_event_config,
.write_event_config = sx9310_write_event_config,
};
static int sx9310_set_trigger_state(struct iio_trigger *trig, bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct sx9310_data *data = iio_priv(indio_dev);
int ret = 0;
mutex_lock(&data->mutex);
if (state)
ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ);
else if (!data->chan_read)
ret = sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
if (ret)
goto out;
data->trigger_enabled = state;
out:
mutex_unlock(&data->mutex);
return ret;
}
static const struct iio_trigger_ops sx9310_trigger_ops = {
.set_trigger_state = sx9310_set_trigger_state,
};
static irqreturn_t sx9310_trigger_handler(int irq, void *private)
{
struct iio_poll_func *pf = private;
struct iio_dev *indio_dev = pf->indio_dev;
struct sx9310_data *data = iio_priv(indio_dev);
__be16 val;
int bit, ret, i = 0;
mutex_lock(&data->mutex);
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength) {
ret = sx9310_read_prox_data(data, &indio_dev->channels[bit],
&val);
if (ret)
goto out;
data->buffer.channels[i++] = val;
}
iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer,
pf->timestamp);
out:
mutex_unlock(&data->mutex);
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int sx9310_buffer_preenable(struct iio_dev *indio_dev)
{
struct sx9310_data *data = iio_priv(indio_dev);
unsigned long channels = 0;
int bit, ret;
mutex_lock(&data->mutex);
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength)
__set_bit(indio_dev->channels[bit].channel, &channels);
ret = sx9310_update_chan_en(data, channels, data->chan_event);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_buffer_postdisable(struct iio_dev *indio_dev)
{
struct sx9310_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = sx9310_update_chan_en(data, 0, data->chan_event);
mutex_unlock(&data->mutex);
return ret;
}
static const struct iio_buffer_setup_ops sx9310_buffer_setup_ops = {
.preenable = sx9310_buffer_preenable,
.postdisable = sx9310_buffer_postdisable,
};
struct sx9310_reg_default {
u8 reg;
u8 def;
};
static const struct sx9310_reg_default sx9310_default_regs[] = {
static const struct sx_common_reg_default sx9310_default_regs[] = {
{ SX9310_REG_IRQ_MSK, 0x00 },
{ SX9310_REG_IRQ_FUNC, 0x00 },
/*
@ -1172,7 +770,7 @@ static const struct sx9310_reg_default sx9310_default_regs[] = {
/* Activate all channels and perform an initial compensation. */
static int sx9310_init_compensation(struct iio_dev *indio_dev)
{
struct sx9310_data *data = iio_priv(indio_dev);
struct sx_common_data *data = iio_priv(indio_dev);
int ret;
unsigned int val;
unsigned int ctrl0;
@ -1190,21 +788,16 @@ static int sx9310_init_compensation(struct iio_dev *indio_dev)
ret = regmap_read_poll_timeout(data->regmap, SX9310_REG_STAT1, val,
!(val & SX9310_REG_STAT1_COMPSTAT_MASK),
20000, 2000000);
if (ret) {
if (ret == -ETIMEDOUT)
dev_err(&data->client->dev,
"initial compensation timed out: 0x%02x\n",
val);
if (ret)
return ret;
}
regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
return ret;
}
static const struct sx9310_reg_default *
static const struct sx_common_reg_default *
sx9310_get_default_reg(struct device *dev, int idx,
struct sx9310_reg_default *reg_def)
struct sx_common_reg_default *reg_def)
{
u32 combined[SX9310_NUM_CHANNELS];
u32 start = 0, raw = 0, pos = 0;
@ -1305,47 +898,21 @@ sx9310_get_default_reg(struct device *dev, int idx,
return reg_def;
}
static int sx9310_init_device(struct iio_dev *indio_dev)
{
struct sx9310_data *data = iio_priv(indio_dev);
struct sx9310_reg_default tmp;
const struct sx9310_reg_default *initval;
int ret;
unsigned int i, val;
ret = regmap_write(data->regmap, SX9310_REG_RESET, SX9310_SOFT_RESET);
if (ret)
return ret;
usleep_range(1000, 2000); /* power-up time is ~1ms. */
/* Clear reset interrupt state by reading SX9310_REG_IRQ_SRC. */
ret = regmap_read(data->regmap, SX9310_REG_IRQ_SRC, &val);
if (ret)
return ret;
/* Program some sane defaults. */
for (i = 0; i < ARRAY_SIZE(sx9310_default_regs); i++) {
initval = sx9310_get_default_reg(&indio_dev->dev, i, &tmp);
ret = regmap_write(data->regmap, initval->reg, initval->def);
if (ret)
return ret;
}
return sx9310_init_compensation(indio_dev);
}
static int sx9310_set_indio_dev_name(struct device *dev,
struct iio_dev *indio_dev,
unsigned int whoami)
static int sx9310_check_whoami(struct device *dev,
struct iio_dev *indio_dev)
{
struct sx_common_data *data = iio_priv(indio_dev);
unsigned int long ddata;
unsigned int whoami;
int ret;
ret = regmap_read(data->regmap, SX9310_REG_WHOAMI, &whoami);
if (ret)
return ret;
ddata = (uintptr_t)device_get_match_data(dev);
if (ddata != whoami) {
dev_err(dev, "WHOAMI does not match device data: %u\n", whoami);
return -ENODEV;
}
if (ddata != whoami)
return -EINVAL;
switch (whoami) {
case SX9310_WHOAMI_VALUE:
@ -1355,115 +922,52 @@ static int sx9310_set_indio_dev_name(struct device *dev,
indio_dev->name = "sx9311";
break;
default:
dev_err(dev, "unexpected WHOAMI response: %u\n", whoami);
return -ENODEV;
}
return 0;
}
static void sx9310_regulator_disable(void *_data)
{
struct sx9310_data *data = _data;
static const struct sx_common_chip_info sx9310_chip_info = {
.reg_stat = SX9310_REG_STAT0,
.reg_irq_msk = SX9310_REG_IRQ_MSK,
.reg_enable_chan = SX9310_REG_PROX_CTRL0,
.reg_reset = SX9310_REG_RESET,
regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies);
}
.mask_enable_chan = SX9310_REG_STAT1_COMPSTAT_MASK,
.irq_msk_offset = 3,
.num_channels = SX9310_NUM_CHANNELS,
.num_default_regs = ARRAY_SIZE(sx9310_default_regs),
.ops = {
.read_prox_data = sx9310_read_prox_data,
.check_whoami = sx9310_check_whoami,
.init_compensation = sx9310_init_compensation,
.wait_for_sample = sx9310_wait_for_sample,
.get_default_reg = sx9310_get_default_reg,
},
.iio_channels = sx9310_channels,
.num_iio_channels = ARRAY_SIZE(sx9310_channels),
.iio_info = {
.read_raw = sx9310_read_raw,
.read_avail = sx9310_read_avail,
.read_event_value = sx9310_read_event_val,
.write_event_value = sx9310_write_event_val,
.write_raw = sx9310_write_raw,
.read_event_config = sx_common_read_event_config,
.write_event_config = sx_common_write_event_config,
},
};
static int sx9310_probe(struct i2c_client *client)
{
int ret;
struct device *dev = &client->dev;
struct iio_dev *indio_dev;
struct sx9310_data *data;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
data->client = client;
data->supplies[0].supply = "vdd";
data->supplies[1].supply = "svdd";
mutex_init(&data->mutex);
init_completion(&data->completion);
data->regmap = devm_regmap_init_i2c(client, &sx9310_regmap_config);
if (IS_ERR(data->regmap))
return PTR_ERR(data->regmap);
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->supplies),
data->supplies);
if (ret)
return ret;
ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies), data->supplies);
if (ret)
return ret;
/* Must wait for Tpor time after initial power up */
usleep_range(1000, 1100);
ret = devm_add_action_or_reset(dev, sx9310_regulator_disable, data);
if (ret)
return ret;
ret = regmap_read(data->regmap, SX9310_REG_WHOAMI, &data->whoami);
if (ret) {
dev_err(dev, "error in reading WHOAMI register: %d", ret);
return ret;
}
ret = sx9310_set_indio_dev_name(dev, indio_dev, data->whoami);
if (ret)
return ret;
ACPI_COMPANION_SET(&indio_dev->dev, ACPI_COMPANION(dev));
indio_dev->channels = sx9310_channels;
indio_dev->num_channels = ARRAY_SIZE(sx9310_channels);
indio_dev->info = &sx9310_info;
indio_dev->modes = INDIO_DIRECT_MODE;
i2c_set_clientdata(client, indio_dev);
ret = sx9310_init_device(indio_dev);
if (ret)
return ret;
if (client->irq) {
ret = devm_request_threaded_irq(dev, client->irq,
sx9310_irq_handler,
sx9310_irq_thread_handler,
IRQF_ONESHOT,
"sx9310_event", indio_dev);
if (ret)
return ret;
data->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
indio_dev->name,
iio_device_id(indio_dev));
if (!data->trig)
return -ENOMEM;
data->trig->ops = &sx9310_trigger_ops;
iio_trigger_set_drvdata(data->trig, indio_dev);
ret = devm_iio_trigger_register(dev, data->trig);
if (ret)
return ret;
}
ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
iio_pollfunc_store_time,
sx9310_trigger_handler,
&sx9310_buffer_setup_ops);
if (ret)
return ret;
return devm_iio_device_register(dev, indio_dev);
return sx_common_probe(client, &sx9310_chip_info, &sx9310_regmap_config);
}
static int __maybe_unused sx9310_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct sx9310_data *data = iio_priv(indio_dev);
struct sx_common_data *data = iio_priv(dev_get_drvdata(dev));
u8 ctrl0;
int ret;
@ -1471,11 +975,11 @@ static int __maybe_unused sx9310_suspend(struct device *dev)
mutex_lock(&data->mutex);
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0,
&data->suspend_ctrl0);
&data->suspend_ctrl);
if (ret)
goto out;
ctrl0 = data->suspend_ctrl0 & ~SX9310_REG_PROX_CTRL0_SENSOREN_MASK;
ctrl0 = data->suspend_ctrl & ~SX9310_REG_PROX_CTRL0_SENSOREN_MASK;
ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
if (ret)
goto out;
@ -1489,8 +993,7 @@ out:
static int __maybe_unused sx9310_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct sx9310_data *data = iio_priv(indio_dev);
struct sx_common_data *data = iio_priv(dev_get_drvdata(dev));
int ret;
mutex_lock(&data->mutex);
@ -1499,7 +1002,7 @@ static int __maybe_unused sx9310_resume(struct device *dev)
goto out;
ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0,
data->suspend_ctrl0);
data->suspend_ctrl);
out:
mutex_unlock(&data->mutex);
@ -1510,9 +1013,7 @@ out:
return 0;
}
static const struct dev_pm_ops sx9310_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(sx9310_suspend, sx9310_resume)
};
static SIMPLE_DEV_PM_OPS(sx9310_pm_ops, sx9310_suspend, sx9310_resume);
static const struct acpi_device_id sx9310_acpi_match[] = {
{ "STH9310", SX9310_WHOAMI_VALUE },
@ -1558,3 +1059,4 @@ MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
MODULE_AUTHOR("Daniel Campello <campello@chromium.org>");
MODULE_DESCRIPTION("Driver for Semtech SX9310/SX9311 proximity sensor");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(SEMTECH_PROX);

572
drivers/iio/proximity/sx_common.c Normal file
Просмотреть файл

@ -0,0 +1,572 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2021 Google LLC.
*
* Common part of most Semtech SAR sensor.
*/
#include <linux/acpi.h>
#include <linux/bitops.h>
#include <linux/byteorder/generic.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/irqreturn.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <vdso/bits.h>
#include <linux/iio/buffer.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#include "sx_common.h"
/* All Semtech SAR sensors have IRQ bit in the same order. */
#define SX_COMMON_CONVDONE_IRQ BIT(0)
#define SX_COMMON_FAR_IRQ BIT(2)
#define SX_COMMON_CLOSE_IRQ BIT(3)
const struct iio_event_spec sx_common_events[3] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD),
},
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD),
},
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_HYSTERESIS) |
BIT(IIO_EV_INFO_VALUE),
},
};
EXPORT_SYMBOL_NS_GPL(sx_common_events, SEMTECH_PROX);
static irqreturn_t sx_common_irq_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct sx_common_data *data = iio_priv(indio_dev);
if (data->trigger_enabled)
iio_trigger_poll(data->trig);
/*
* Even if no event is enabled, we need to wake the thread to clear the
* interrupt state by reading SX_COMMON_REG_IRQ_SRC.
* It is not possible to do that here because regmap_read takes a mutex.
*/
return IRQ_WAKE_THREAD;
}
static void sx_common_push_events(struct iio_dev *indio_dev)
{
int ret;
unsigned int val, chan;
struct sx_common_data *data = iio_priv(indio_dev);
s64 timestamp = iio_get_time_ns(indio_dev);
unsigned long prox_changed;
/* Read proximity state on all channels */
ret = regmap_read(data->regmap, data->chip_info->reg_stat, &val);
if (ret) {
dev_err(&data->client->dev, "i2c transfer error in irq\n");
return;
}
val <<= data->chip_info->stat_offset;
/*
* Only iterate over channels with changes on proximity status that have
* events enabled.
*/
prox_changed = (data->chan_prox_stat ^ val) & data->chan_event;
for_each_set_bit(chan, &prox_changed, data->chip_info->num_channels) {
int dir;
u64 ev;
dir = (val & BIT(chan)) ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan,
IIO_EV_TYPE_THRESH, dir);
iio_push_event(indio_dev, ev, timestamp);
}
data->chan_prox_stat = val;
}
static int sx_common_enable_irq(struct sx_common_data *data, unsigned int irq)
{
if (!data->client->irq)
return 0;
return regmap_update_bits(data->regmap, data->chip_info->reg_irq_msk,
irq << data->chip_info->irq_msk_offset,
irq << data->chip_info->irq_msk_offset);
}
static int sx_common_disable_irq(struct sx_common_data *data, unsigned int irq)
{
if (!data->client->irq)
return 0;
return regmap_update_bits(data->regmap, data->chip_info->reg_irq_msk,
irq << data->chip_info->irq_msk_offset, 0);
}
static int sx_common_update_chan_en(struct sx_common_data *data,
unsigned long chan_read,
unsigned long chan_event)
{
int ret;
unsigned long channels = chan_read | chan_event;
if ((data->chan_read | data->chan_event) != channels) {
ret = regmap_update_bits(data->regmap,
data->chip_info->reg_enable_chan,
data->chip_info->mask_enable_chan,
channels);
if (ret)
return ret;
}
data->chan_read = chan_read;
data->chan_event = chan_event;
return 0;
}
static int sx_common_get_read_channel(struct sx_common_data *data, int channel)
{
return sx_common_update_chan_en(data, data->chan_read | BIT(channel),
data->chan_event);
}
static int sx_common_put_read_channel(struct sx_common_data *data, int channel)
{
return sx_common_update_chan_en(data, data->chan_read & ~BIT(channel),
data->chan_event);
}
static int sx_common_get_event_channel(struct sx_common_data *data, int channel)
{
return sx_common_update_chan_en(data, data->chan_read,
data->chan_event | BIT(channel));
}
static int sx_common_put_event_channel(struct sx_common_data *data, int channel)
{
return sx_common_update_chan_en(data, data->chan_read,
data->chan_event & ~BIT(channel));
}
/**
* sx_common_read_proximity() - Read raw proximity value.
* @data: Internal data
* @chan: Channel to read
* @val: pointer to return read value.
*
* Request a conversion, wait for the sensor to be ready and
* return the raw proximity value.
*/
int sx_common_read_proximity(struct sx_common_data *data,
const struct iio_chan_spec *chan, int *val)
{
int ret;
__be16 rawval;
mutex_lock(&data->mutex);
ret = sx_common_get_read_channel(data, chan->channel);
if (ret)
goto out;
ret = sx_common_enable_irq(data, SX_COMMON_CONVDONE_IRQ);
if (ret)
goto out_put_channel;
mutex_unlock(&data->mutex);
if (data->client->irq) {
ret = wait_for_completion_interruptible(&data->completion);
reinit_completion(&data->completion);
} else {
ret = data->chip_info->ops.wait_for_sample(data);
}
mutex_lock(&data->mutex);
if (ret)
goto out_disable_irq;
ret = data->chip_info->ops.read_prox_data(data, chan, &rawval);
if (ret)
goto out_disable_irq;
*val = sign_extend32(be16_to_cpu(rawval), chan->scan_type.realbits - 1);
ret = sx_common_disable_irq(data, SX_COMMON_CONVDONE_IRQ);
if (ret)
goto out_put_channel;
ret = sx_common_put_read_channel(data, chan->channel);
if (ret)
goto out;
mutex_unlock(&data->mutex);
return IIO_VAL_INT;
out_disable_irq:
sx_common_disable_irq(data, SX_COMMON_CONVDONE_IRQ);
out_put_channel:
sx_common_put_read_channel(data, chan->channel);
out:
mutex_unlock(&data->mutex);
return ret;
}
EXPORT_SYMBOL_NS_GPL(sx_common_read_proximity, SEMTECH_PROX);
/**
* sx_common_read_event_config() - Configure event setting.
* @indio_dev: iio device object
* @chan: Channel to read
* @type: Type of event (unused)
* @dir: Direction of event (unused)
*
* return if the given channel is used for event gathering.
*/
int sx_common_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 sx_common_data *data = iio_priv(indio_dev);
return !!(data->chan_event & BIT(chan->channel));
}
EXPORT_SYMBOL_NS_GPL(sx_common_read_event_config, SEMTECH_PROX);
/**
* sx_common_write_event_config() - Configure event setting.
* @indio_dev: iio device object
* @chan: Channel to enable
* @type: Type of event (unused)
* @dir: Direction of event (unused)
* @state: State of the event.
*
* Enable/Disable event on a given channel.
*/
int sx_common_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 sx_common_data *data = iio_priv(indio_dev);
unsigned int eventirq = SX_COMMON_FAR_IRQ | SX_COMMON_CLOSE_IRQ;
int ret;
/* If the state hasn't changed, there's nothing to do. */
if (!!(data->chan_event & BIT(chan->channel)) == state)
return 0;
mutex_lock(&data->mutex);
if (state) {
ret = sx_common_get_event_channel(data, chan->channel);
if (ret)
goto out_unlock;
if (!(data->chan_event & ~BIT(chan->channel))) {
ret = sx_common_enable_irq(data, eventirq);
if (ret)
sx_common_put_event_channel(data, chan->channel);
}
} else {
ret = sx_common_put_event_channel(data, chan->channel);
if (ret)
goto out_unlock;
if (!data->chan_event) {
ret = sx_common_disable_irq(data, eventirq);
if (ret)
sx_common_get_event_channel(data, chan->channel);
}
}
out_unlock:
mutex_unlock(&data->mutex);
return ret;
}
EXPORT_SYMBOL_NS_GPL(sx_common_write_event_config, SEMTECH_PROX);
static int sx_common_set_trigger_state(struct iio_trigger *trig, bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct sx_common_data *data = iio_priv(indio_dev);
int ret = 0;
mutex_lock(&data->mutex);
if (state)
ret = sx_common_enable_irq(data, SX_COMMON_CONVDONE_IRQ);
else if (!data->chan_read)
ret = sx_common_disable_irq(data, SX_COMMON_CONVDONE_IRQ);
if (ret)
goto out;
data->trigger_enabled = state;
out:
mutex_unlock(&data->mutex);
return ret;
}
static const struct iio_trigger_ops sx_common_trigger_ops = {
.set_trigger_state = sx_common_set_trigger_state,
};
static irqreturn_t sx_common_irq_thread_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct sx_common_data *data = iio_priv(indio_dev);
int ret;
unsigned int val;
mutex_lock(&data->mutex);
ret = regmap_read(data->regmap, SX_COMMON_REG_IRQ_SRC, &val);
if (ret) {
dev_err(&data->client->dev, "i2c transfer error in irq\n");
goto out;
}
if (val & ((SX_COMMON_FAR_IRQ | SX_COMMON_CLOSE_IRQ) << data->chip_info->irq_msk_offset))
sx_common_push_events(indio_dev);
if (val & (SX_COMMON_CONVDONE_IRQ << data->chip_info->irq_msk_offset))
complete(&data->completion);
out:
mutex_unlock(&data->mutex);
return IRQ_HANDLED;
}
static irqreturn_t sx_common_trigger_handler(int irq, void *private)
{
struct iio_poll_func *pf = private;
struct iio_dev *indio_dev = pf->indio_dev;
struct sx_common_data *data = iio_priv(indio_dev);
__be16 val;
int bit, ret, i = 0;
mutex_lock(&data->mutex);
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength) {
ret = data->chip_info->ops.read_prox_data(data,
&indio_dev->channels[bit],
&val);
if (ret)
goto out;
data->buffer.channels[i++] = val;
}
iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer,
pf->timestamp);
out:
mutex_unlock(&data->mutex);
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int sx_common_buffer_preenable(struct iio_dev *indio_dev)
{
struct sx_common_data *data = iio_priv(indio_dev);
unsigned long channels = 0;
int bit, ret;
mutex_lock(&data->mutex);
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength)
__set_bit(indio_dev->channels[bit].channel, &channels);
ret = sx_common_update_chan_en(data, channels, data->chan_event);
mutex_unlock(&data->mutex);
return ret;
}
static int sx_common_buffer_postdisable(struct iio_dev *indio_dev)
{
struct sx_common_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = sx_common_update_chan_en(data, 0, data->chan_event);
mutex_unlock(&data->mutex);
return ret;
}
static const struct iio_buffer_setup_ops sx_common_buffer_setup_ops = {
.preenable = sx_common_buffer_preenable,
.postdisable = sx_common_buffer_postdisable,
};
static void sx_common_regulator_disable(void *_data)
{
struct sx_common_data *data = _data;
regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies);
}
#define SX_COMMON_SOFT_RESET 0xde
static int sx_common_init_device(struct iio_dev *indio_dev)
{
struct sx_common_data *data = iio_priv(indio_dev);
struct sx_common_reg_default tmp;
const struct sx_common_reg_default *initval;
int ret;
unsigned int i, val;
ret = regmap_write(data->regmap, data->chip_info->reg_reset,
SX_COMMON_SOFT_RESET);
if (ret)
return ret;
usleep_range(1000, 2000); /* power-up time is ~1ms. */
/* Clear reset interrupt state by reading SX_COMMON_REG_IRQ_SRC. */
ret = regmap_read(data->regmap, SX_COMMON_REG_IRQ_SRC, &val);
if (ret)
return ret;
/* Program defaults from constant or BIOS. */
for (i = 0; i < data->chip_info->num_default_regs; i++) {
initval = data->chip_info->ops.get_default_reg(&indio_dev->dev,
i, &tmp);
ret = regmap_write(data->regmap, initval->reg, initval->def);
if (ret)
return ret;
}
return data->chip_info->ops.init_compensation(indio_dev);
}
/**
* sx_common_probe() - Common setup for Semtech SAR sensor
* @client: I2C client object
* @chip_info: Semtech sensor chip information.
* @regmap_config: Sensor registers map configuration.
*/
int sx_common_probe(struct i2c_client *client,
const struct sx_common_chip_info *chip_info,
const struct regmap_config *regmap_config)
{
struct device *dev = &client->dev;
struct iio_dev *indio_dev;
struct sx_common_data *data;
int ret;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
data->chip_info = chip_info;
data->client = client;
data->supplies[0].supply = "vdd";
data->supplies[1].supply = "svdd";
mutex_init(&data->mutex);
init_completion(&data->completion);
data->regmap = devm_regmap_init_i2c(client, regmap_config);
if (IS_ERR(data->regmap))
return dev_err_probe(dev, PTR_ERR(data->regmap),
"Could init register map\n");
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->supplies),
data->supplies);
if (ret)
return dev_err_probe(dev, ret, "Unable to get regulators\n");
ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies), data->supplies);
if (ret)
return dev_err_probe(dev, ret, "Unable to enable regulators\n");
/* Must wait for Tpor time after initial power up */
usleep_range(1000, 1100);
ret = devm_add_action_or_reset(dev, sx_common_regulator_disable, data);
if (ret)
return dev_err_probe(dev, ret,
"Unable to register regulators deleter\n");
ret = data->chip_info->ops.check_whoami(dev, indio_dev);
if (ret)
return dev_err_probe(dev, ret, "error reading WHOAMI\n");
ACPI_COMPANION_SET(&indio_dev->dev, ACPI_COMPANION(dev));
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = data->chip_info->iio_channels;
indio_dev->num_channels = data->chip_info->num_iio_channels;
indio_dev->info = &data->chip_info->iio_info;
i2c_set_clientdata(client, indio_dev);
ret = sx_common_init_device(indio_dev);
if (ret)
return dev_err_probe(dev, ret, "Unable to initialize sensor\n");
if (client->irq) {
ret = devm_request_threaded_irq(dev, client->irq,
sx_common_irq_handler,
sx_common_irq_thread_handler,
IRQF_ONESHOT,
"sx_event", indio_dev);
if (ret)
return dev_err_probe(dev, ret, "No IRQ\n");
data->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
indio_dev->name,
iio_device_id(indio_dev));
if (!data->trig)
return -ENOMEM;
data->trig->ops = &sx_common_trigger_ops;
iio_trigger_set_drvdata(data->trig, indio_dev);
ret = devm_iio_trigger_register(dev, data->trig);
if (ret)
return ret;
}
ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
iio_pollfunc_store_time,
sx_common_trigger_handler,
&sx_common_buffer_setup_ops);
if (ret)
return ret;
return devm_iio_device_register(dev, indio_dev);
}
EXPORT_SYMBOL_NS_GPL(sx_common_probe, SEMTECH_PROX);
MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
MODULE_DESCRIPTION("Common functions and structures for Semtech sensor");
MODULE_LICENSE("GPL v2");

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drivers/iio/proximity/sx_common.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright 2021 Google LLC.
*
* Code shared between most Semtech SAR sensor driver.
*/
#ifndef IIO_SX_COMMON_H
#define IIO_SX_COMMON_H
#include <linux/iio/iio.h>
#include <linux/iio/types.h>
#include <linux/regulator/consumer.h>
#include <linux/types.h>
struct device;
struct i2c_client;
struct regmap_config;
struct sx_common_data;
#define SX_COMMON_REG_IRQ_SRC 0x00
#define SX_COMMON_MAX_NUM_CHANNELS 4
static_assert(SX_COMMON_MAX_NUM_CHANNELS < BITS_PER_LONG);
struct sx_common_reg_default {
u8 reg;
u8 def;
};
/**
* struct sx_common_ops: function pointers needed by common code
*
* List functions needed by common code to gather information or configure
* the sensor.
*
* @read_prox_data: Function to read raw proximity data.
* @check_whoami: Set device name based on whoami register.
* @init_compensation: Function to set initial compensation.
* @wait_for_sample: When there are no physical IRQ, function to wait for a
* sample to be ready.
* @get_default_reg: Populate the initial value for a given register.
*/
struct sx_common_ops {
int (*read_prox_data)(struct sx_common_data *data,
const struct iio_chan_spec *chan, __be16 *val);
int (*check_whoami)(struct device *dev, struct iio_dev *indio_dev);
int (*init_compensation)(struct iio_dev *indio_dev);
int (*wait_for_sample)(struct sx_common_data *data);
const struct sx_common_reg_default *
(*get_default_reg)(struct device *dev, int idx,
struct sx_common_reg_default *reg_def);
};
/**
* struct sx_common_chip_info: Semtech Sensor private chip information
*
* @reg_stat: Main status register address.
* @reg_irq_msk: IRQ mask register address.
* @reg_enable_chan: Address to enable/disable channels.
* Each phase presented by the sensor is an IIO channel..
* @reg_reset: Reset register address.
* @mask_enable_chan: Mask over the channels bits in the enable channel
* register.
* @stat_offset: Offset to check phase status.
* @irq_msk_offset: Offset to enable interrupt in the IRQ mask
* register.
* @num_channels: Number of channels.
* @num_default_regs: Number of internal registers that can be configured.
*
* @ops: Private functions pointers.
* @iio_channels: Description of exposed iio channels.
* @num_iio_channels: Number of iio_channels.
* @iio_info: iio_info structure for this driver.
*/
struct sx_common_chip_info {
unsigned int reg_stat;
unsigned int reg_irq_msk;
unsigned int reg_enable_chan;
unsigned int reg_reset;
unsigned int mask_enable_chan;
unsigned int stat_offset;
unsigned int irq_msk_offset;
unsigned int num_channels;
int num_default_regs;
struct sx_common_ops ops;
const struct iio_chan_spec *iio_channels;
int num_iio_channels;
struct iio_info iio_info;
};
/**
* struct sx_common_data: Semtech Sensor private data structure.
*
* @chip_info: Structure defining sensor internals.
* @mutex: Serialize access to registers and channel configuration.
* @completion: completion object to wait for data acquisition.
* @client: I2C client structure.
* @trig: IIO trigger object.
* @regmap: Register map.
* @num_default_regs: Number of default registers to set at init.
* @supplies: Power supplies object.
* @chan_prox_stat: Last reading of the proximity status for each channel.
* We only send an event to user space when this changes.
* @trigger_enabled: True when the device trigger is enabled.
* @buffer: Buffer to store raw samples.
* @suspend_ctrl: Remember enabled channels and sample rate during suspend.
* @chan_read: Bit field for each raw channel enabled.
* @chan_event: Bit field for each event enabled.
*/
struct sx_common_data {
const struct sx_common_chip_info *chip_info;
struct mutex mutex;
struct completion completion;
struct i2c_client *client;
struct iio_trigger *trig;
struct regmap *regmap;
struct regulator_bulk_data supplies[2];
unsigned long chan_prox_stat;
bool trigger_enabled;
/* Ensure correct alignment of timestamp when present. */
struct {
__be16 channels[SX_COMMON_MAX_NUM_CHANNELS];
s64 ts __aligned(8);
} buffer;
unsigned int suspend_ctrl;
unsigned long chan_read;
unsigned long chan_event;
};
int sx_common_read_proximity(struct sx_common_data *data,
const struct iio_chan_spec *chan, int *val);
int sx_common_read_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir);
int sx_common_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);
int sx_common_probe(struct i2c_client *client,
const struct sx_common_chip_info *chip_info,
const struct regmap_config *regmap_config);
/* 3 is the number of events defined by a single phase. */
extern const struct iio_event_spec sx_common_events[3];
#endif /* IIO_SX_COMMON_H */