iio: driver for Semtech SX9500 proximity solution
Supports buffering, IIO events and changing sampling frequency. Datasheet available at: http://www.semtech.com/images/datasheet/sx9500_ag.pdf Signed-off-by: Vlad Dogaru <vlad.dogaru@intel.com> Reviewed-by: Hartmut Knaack <knaack.h@gmx.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Vlad Dogaru
Jonathan Cameron
parent
75d44ce08f
commit
4193c0f1d8
|
|
@ -17,3 +17,20 @@ config AS3935
|
|||
module will be called as3935
|
||||
|
||||
endmenu
|
||||
|
||||
menu "Proximity sensors"
|
||||
|
||||
config SX9500
|
||||
tristate "SX9500 Semtech proximity sensor"
|
||||
select IIO_BUFFER
|
||||
select IIO_TRIGGERED_BUFFER
|
||||
select REGMAP_I2C
|
||||
depends on I2C
|
||||
help
|
||||
Say Y here to build a driver for Semtech's SX9500 capacitive
|
||||
proximity/button sensor.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called sx9500.
|
||||
|
||||
endmenu
|
||||
|
|
|
|||
|
|
@ -4,3 +4,4 @@
|
|||
|
||||
# When adding new entries keep the list in alphabetical order
|
||||
obj-$(CONFIG_AS3935) += as3935.o
|
||||
obj-$(CONFIG_SX9500) += sx9500.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,752 @@
|
|||
/*
|
||||
* Copyright (c) 2014 Intel Corporation
|
||||
*
|
||||
* Driver for Semtech's SX9500 capacitive proximity/button solution.
|
||||
* Datasheet available at
|
||||
* <http://www.semtech.com/images/datasheet/sx9500.pdf>.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License version 2 as published by
|
||||
* the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/irq.h>
|
||||
#include <linux/acpi.h>
|
||||
#include <linux/gpio/consumer.h>
|
||||
#include <linux/regmap.h>
|
||||
|
||||
#include <linux/iio/iio.h>
|
||||
#include <linux/iio/buffer.h>
|
||||
#include <linux/iio/sysfs.h>
|
||||
#include <linux/iio/events.h>
|
||||
#include <linux/iio/trigger.h>
|
||||
#include <linux/iio/triggered_buffer.h>
|
||||
#include <linux/iio/trigger_consumer.h>
|
||||
|
||||
#define SX9500_DRIVER_NAME "sx9500"
|
||||
#define SX9500_IRQ_NAME "sx9500_event"
|
||||
#define SX9500_GPIO_NAME "sx9500_gpio"
|
||||
|
||||
/* Register definitions. */
|
||||
#define SX9500_REG_IRQ_SRC 0x00
|
||||
#define SX9500_REG_STAT 0x01
|
||||
#define SX9500_REG_IRQ_MSK 0x03
|
||||
|
||||
#define SX9500_REG_PROX_CTRL0 0x06
|
||||
#define SX9500_REG_PROX_CTRL1 0x07
|
||||
#define SX9500_REG_PROX_CTRL2 0x08
|
||||
#define SX9500_REG_PROX_CTRL3 0x09
|
||||
#define SX9500_REG_PROX_CTRL4 0x0a
|
||||
#define SX9500_REG_PROX_CTRL5 0x0b
|
||||
#define SX9500_REG_PROX_CTRL6 0x0c
|
||||
#define SX9500_REG_PROX_CTRL7 0x0d
|
||||
#define SX9500_REG_PROX_CTRL8 0x0e
|
||||
|
||||
#define SX9500_REG_SENSOR_SEL 0x20
|
||||
#define SX9500_REG_USE_MSB 0x21
|
||||
#define SX9500_REG_USE_LSB 0x22
|
||||
#define SX9500_REG_AVG_MSB 0x23
|
||||
#define SX9500_REG_AVG_LSB 0x24
|
||||
#define SX9500_REG_DIFF_MSB 0x25
|
||||
#define SX9500_REG_DIFF_LSB 0x26
|
||||
#define SX9500_REG_OFFSET_MSB 0x27
|
||||
#define SX9500_REG_OFFSET_LSB 0x28
|
||||
|
||||
#define SX9500_REG_RESET 0x7f
|
||||
|
||||
/* Write this to REG_RESET to do a soft reset. */
|
||||
#define SX9500_SOFT_RESET 0xde
|
||||
|
||||
#define SX9500_SCAN_PERIOD_MASK GENMASK(6, 4)
|
||||
#define SX9500_SCAN_PERIOD_SHIFT 4
|
||||
|
||||
/*
|
||||
* These serve for identifying IRQ source in the IRQ_SRC register, and
|
||||
* also for masking the IRQs in the IRQ_MSK register.
|
||||
*/
|
||||
#define SX9500_CLOSE_IRQ BIT(6)
|
||||
#define SX9500_FAR_IRQ BIT(5)
|
||||
#define SX9500_CONVDONE_IRQ BIT(3)
|
||||
|
||||
#define SX9500_PROXSTAT_SHIFT 4
|
||||
|
||||
#define SX9500_NUM_CHANNELS 4
|
||||
|
||||
struct sx9500_data {
|
||||
struct mutex mutex;
|
||||
struct i2c_client *client;
|
||||
struct iio_trigger *trig;
|
||||
struct regmap *regmap;
|
||||
/*
|
||||
* Last reading of the proximity status for each channel. We
|
||||
* only send an event to user space when this changes.
|
||||
*/
|
||||
bool prox_stat[SX9500_NUM_CHANNELS];
|
||||
bool event_enabled[SX9500_NUM_CHANNELS];
|
||||
bool trigger_enabled;
|
||||
u16 *buffer;
|
||||
};
|
||||
|
||||
static const struct iio_event_spec sx9500_events[] = {
|
||||
{
|
||||
.type = IIO_EV_TYPE_THRESH,
|
||||
.dir = IIO_EV_DIR_EITHER,
|
||||
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
|
||||
},
|
||||
};
|
||||
|
||||
#define SX9500_CHANNEL(idx) \
|
||||
{ \
|
||||
.type = IIO_PROXIMITY, \
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
||||
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
|
||||
.indexed = 1, \
|
||||
.channel = idx, \
|
||||
.event_spec = sx9500_events, \
|
||||
.num_event_specs = ARRAY_SIZE(sx9500_events), \
|
||||
.scan_index = idx, \
|
||||
.scan_type = { \
|
||||
.sign = 'u', \
|
||||
.realbits = 16, \
|
||||
.storagebits = 16, \
|
||||
.shift = 0, \
|
||||
}, \
|
||||
}
|
||||
|
||||
static const struct iio_chan_spec sx9500_channels[] = {
|
||||
SX9500_CHANNEL(0),
|
||||
SX9500_CHANNEL(1),
|
||||
SX9500_CHANNEL(2),
|
||||
SX9500_CHANNEL(3),
|
||||
IIO_CHAN_SOFT_TIMESTAMP(4),
|
||||
};
|
||||
|
||||
static const struct {
|
||||
int val;
|
||||
int val2;
|
||||
} sx9500_samp_freq_table[] = {
|
||||
{33, 333333},
|
||||
{16, 666666},
|
||||
{11, 111111},
|
||||
{8, 333333},
|
||||
{6, 666666},
|
||||
{5, 0},
|
||||
{3, 333333},
|
||||
{2, 500000},
|
||||
};
|
||||
|
||||
static const struct regmap_range sx9500_writable_reg_ranges[] = {
|
||||
regmap_reg_range(SX9500_REG_IRQ_MSK, SX9500_REG_IRQ_MSK),
|
||||
regmap_reg_range(SX9500_REG_PROX_CTRL0, SX9500_REG_PROX_CTRL8),
|
||||
regmap_reg_range(SX9500_REG_SENSOR_SEL, SX9500_REG_SENSOR_SEL),
|
||||
regmap_reg_range(SX9500_REG_OFFSET_MSB, SX9500_REG_OFFSET_LSB),
|
||||
regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET),
|
||||
};
|
||||
|
||||
static const struct regmap_access_table sx9500_writeable_regs = {
|
||||
.yes_ranges = sx9500_writable_reg_ranges,
|
||||
.n_yes_ranges = ARRAY_SIZE(sx9500_writable_reg_ranges),
|
||||
};
|
||||
|
||||
/*
|
||||
* All allocated registers are readable, so we just list unallocated
|
||||
* ones.
|
||||
*/
|
||||
static const struct regmap_range sx9500_non_readable_reg_ranges[] = {
|
||||
regmap_reg_range(SX9500_REG_STAT + 1, SX9500_REG_STAT + 1),
|
||||
regmap_reg_range(SX9500_REG_IRQ_MSK + 1, SX9500_REG_PROX_CTRL0 - 1),
|
||||
regmap_reg_range(SX9500_REG_PROX_CTRL8 + 1, SX9500_REG_SENSOR_SEL - 1),
|
||||
regmap_reg_range(SX9500_REG_OFFSET_LSB + 1, SX9500_REG_RESET - 1),
|
||||
};
|
||||
|
||||
static const struct regmap_access_table sx9500_readable_regs = {
|
||||
.no_ranges = sx9500_non_readable_reg_ranges,
|
||||
.n_no_ranges = ARRAY_SIZE(sx9500_non_readable_reg_ranges),
|
||||
};
|
||||
|
||||
static const struct regmap_range sx9500_volatile_reg_ranges[] = {
|
||||
regmap_reg_range(SX9500_REG_IRQ_SRC, SX9500_REG_STAT),
|
||||
regmap_reg_range(SX9500_REG_USE_MSB, SX9500_REG_OFFSET_LSB),
|
||||
regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET),
|
||||
};
|
||||
|
||||
static const struct regmap_access_table sx9500_volatile_regs = {
|
||||
.yes_ranges = sx9500_volatile_reg_ranges,
|
||||
.n_yes_ranges = ARRAY_SIZE(sx9500_volatile_reg_ranges),
|
||||
};
|
||||
|
||||
static const struct regmap_config sx9500_regmap_config = {
|
||||
.reg_bits = 8,
|
||||
.val_bits = 8,
|
||||
|
||||
.max_register = SX9500_REG_RESET,
|
||||
.cache_type = REGCACHE_RBTREE,
|
||||
|
||||
.wr_table = &sx9500_writeable_regs,
|
||||
.rd_table = &sx9500_readable_regs,
|
||||
.volatile_table = &sx9500_volatile_regs,
|
||||
};
|
||||
|
||||
static int sx9500_read_proximity(struct sx9500_data *data,
|
||||
const struct iio_chan_spec *chan,
|
||||
int *val)
|
||||
{
|
||||
int ret;
|
||||
__be16 regval;
|
||||
|
||||
ret = regmap_write(data->regmap, SX9500_REG_SENSOR_SEL, chan->channel);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = regmap_bulk_read(data->regmap, SX9500_REG_USE_MSB, ®val, 2);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
*val = 32767 - (s16)be16_to_cpu(regval);
|
||||
|
||||
return IIO_VAL_INT;
|
||||
}
|
||||
|
||||
static int sx9500_read_samp_freq(struct sx9500_data *data,
|
||||
int *val, int *val2)
|
||||
{
|
||||
int ret;
|
||||
unsigned int regval;
|
||||
|
||||
mutex_lock(&data->mutex);
|
||||
ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, ®val);
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
regval = (regval & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT;
|
||||
*val = sx9500_samp_freq_table[regval].val;
|
||||
*val2 = sx9500_samp_freq_table[regval].val2;
|
||||
|
||||
return IIO_VAL_INT_PLUS_MICRO;
|
||||
}
|
||||
|
||||
static int sx9500_read_raw(struct iio_dev *indio_dev,
|
||||
const struct iio_chan_spec *chan,
|
||||
int *val, int *val2, long mask)
|
||||
{
|
||||
struct sx9500_data *data = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
switch (chan->type) {
|
||||
case IIO_PROXIMITY:
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
if (iio_buffer_enabled(indio_dev))
|
||||
return -EBUSY;
|
||||
mutex_lock(&data->mutex);
|
||||
ret = sx9500_read_proximity(data, chan, val);
|
||||
mutex_unlock(&data->mutex);
|
||||
return ret;
|
||||
case IIO_CHAN_INFO_SAMP_FREQ:
|
||||
return sx9500_read_samp_freq(data, val, val2);
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static int sx9500_set_samp_freq(struct sx9500_data *data,
|
||||
int val, int val2)
|
||||
{
|
||||
int i, ret;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(sx9500_samp_freq_table); i++)
|
||||
if (val == sx9500_samp_freq_table[i].val &&
|
||||
val2 == sx9500_samp_freq_table[i].val2)
|
||||
break;
|
||||
|
||||
if (i == ARRAY_SIZE(sx9500_samp_freq_table))
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&data->mutex);
|
||||
|
||||
ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
|
||||
SX9500_SCAN_PERIOD_MASK,
|
||||
i << SX9500_SCAN_PERIOD_SHIFT);
|
||||
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sx9500_write_raw(struct iio_dev *indio_dev,
|
||||
const struct iio_chan_spec *chan,
|
||||
int val, int val2, long mask)
|
||||
{
|
||||
struct sx9500_data *data = iio_priv(indio_dev);
|
||||
|
||||
switch (chan->type) {
|
||||
case IIO_PROXIMITY:
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_SAMP_FREQ:
|
||||
return sx9500_set_samp_freq(data, val, val2);
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static irqreturn_t sx9500_irq_handler(int irq, void *private)
|
||||
{
|
||||
struct iio_dev *indio_dev = private;
|
||||
struct sx9500_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 SX9500_REG_IRQ_SRC. It
|
||||
* is not possible to do that here because regmap_read takes a
|
||||
* mutex.
|
||||
*/
|
||||
return IRQ_WAKE_THREAD;
|
||||
}
|
||||
|
||||
static irqreturn_t sx9500_irq_thread_handler(int irq, void *private)
|
||||
{
|
||||
struct iio_dev *indio_dev = private;
|
||||
struct sx9500_data *data = iio_priv(indio_dev);
|
||||
int ret;
|
||||
unsigned int val, chan;
|
||||
|
||||
mutex_lock(&data->mutex);
|
||||
|
||||
ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val);
|
||||
if (ret < 0) {
|
||||
dev_err(&data->client->dev, "i2c transfer error in irq\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (!(val & (SX9500_CLOSE_IRQ | SX9500_FAR_IRQ)))
|
||||
goto out;
|
||||
|
||||
ret = regmap_read(data->regmap, SX9500_REG_STAT, &val);
|
||||
if (ret < 0) {
|
||||
dev_err(&data->client->dev, "i2c transfer error in irq\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
val >>= SX9500_PROXSTAT_SHIFT;
|
||||
for (chan = 0; chan < SX9500_NUM_CHANNELS; chan++) {
|
||||
int dir;
|
||||
u64 ev;
|
||||
bool new_prox = val & BIT(chan);
|
||||
|
||||
if (!data->event_enabled[chan])
|
||||
continue;
|
||||
if (new_prox == data->prox_stat[chan])
|
||||
/* No change on this channel. */
|
||||
continue;
|
||||
|
||||
dir = new_prox ? 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, iio_get_time_ns());
|
||||
data->prox_stat[chan] = new_prox;
|
||||
}
|
||||
|
||||
out:
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int sx9500_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 sx9500_data *data = iio_priv(indio_dev);
|
||||
|
||||
if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH ||
|
||||
dir != IIO_EV_DIR_EITHER)
|
||||
return -EINVAL;
|
||||
|
||||
return data->event_enabled[chan->channel];
|
||||
}
|
||||
|
||||
static int sx9500_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 sx9500_data *data = iio_priv(indio_dev);
|
||||
int ret, i;
|
||||
bool any_active = false;
|
||||
unsigned int irqmask;
|
||||
|
||||
if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH ||
|
||||
dir != IIO_EV_DIR_EITHER)
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&data->mutex);
|
||||
|
||||
data->event_enabled[chan->channel] = state;
|
||||
|
||||
for (i = 0; i < SX9500_NUM_CHANNELS; i++)
|
||||
if (data->event_enabled[i]) {
|
||||
any_active = true;
|
||||
break;
|
||||
}
|
||||
|
||||
irqmask = SX9500_CLOSE_IRQ | SX9500_FAR_IRQ;
|
||||
if (any_active)
|
||||
ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK,
|
||||
irqmask, irqmask);
|
||||
else
|
||||
ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK,
|
||||
irqmask, 0);
|
||||
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sx9500_update_scan_mode(struct iio_dev *indio_dev,
|
||||
const unsigned long *scan_mask)
|
||||
{
|
||||
struct sx9500_data *data = iio_priv(indio_dev);
|
||||
|
||||
mutex_lock(&data->mutex);
|
||||
kfree(data->buffer);
|
||||
data->buffer = kzalloc(indio_dev->scan_bytes, GFP_KERNEL);
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
if (data->buffer == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
|
||||
"2.500000 3.333333 5 6.666666 8.333333 11.111111 16.666666 33.333333");
|
||||
|
||||
static struct attribute *sx9500_attributes[] = {
|
||||
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group sx9500_attribute_group = {
|
||||
.attrs = sx9500_attributes,
|
||||
};
|
||||
|
||||
static const struct iio_info sx9500_info = {
|
||||
.driver_module = THIS_MODULE,
|
||||
.attrs = &sx9500_attribute_group,
|
||||
.read_raw = &sx9500_read_raw,
|
||||
.write_raw = &sx9500_write_raw,
|
||||
.read_event_config = &sx9500_read_event_config,
|
||||
.write_event_config = &sx9500_write_event_config,
|
||||
.update_scan_mode = &sx9500_update_scan_mode,
|
||||
};
|
||||
|
||||
static int sx9500_set_trigger_state(struct iio_trigger *trig,
|
||||
bool state)
|
||||
{
|
||||
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
|
||||
struct sx9500_data *data = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
mutex_lock(&data->mutex);
|
||||
|
||||
ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK,
|
||||
SX9500_CONVDONE_IRQ,
|
||||
state ? SX9500_CONVDONE_IRQ : 0);
|
||||
if (ret == 0)
|
||||
data->trigger_enabled = state;
|
||||
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct iio_trigger_ops sx9500_trigger_ops = {
|
||||
.set_trigger_state = sx9500_set_trigger_state,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static irqreturn_t sx9500_trigger_handler(int irq, void *private)
|
||||
{
|
||||
struct iio_poll_func *pf = private;
|
||||
struct iio_dev *indio_dev = pf->indio_dev;
|
||||
struct sx9500_data *data = iio_priv(indio_dev);
|
||||
int val, bit, ret, i = 0;
|
||||
|
||||
mutex_lock(&data->mutex);
|
||||
|
||||
for_each_set_bit(bit, indio_dev->buffer->scan_mask,
|
||||
indio_dev->masklength) {
|
||||
ret = sx9500_read_proximity(data, &indio_dev->channels[bit],
|
||||
&val);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
data->buffer[i++] = val;
|
||||
}
|
||||
|
||||
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
|
||||
iio_get_time_ns());
|
||||
|
||||
out:
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
iio_trigger_notify_done(indio_dev->trig);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
struct sx9500_reg_default {
|
||||
u8 reg;
|
||||
u8 def;
|
||||
};
|
||||
|
||||
static const struct sx9500_reg_default sx9500_default_regs[] = {
|
||||
{
|
||||
.reg = SX9500_REG_PROX_CTRL1,
|
||||
/* Shield enabled, small range. */
|
||||
.def = 0x43,
|
||||
},
|
||||
{
|
||||
.reg = SX9500_REG_PROX_CTRL2,
|
||||
/* x8 gain, 167kHz frequency, finest resolution. */
|
||||
.def = 0x77,
|
||||
},
|
||||
{
|
||||
.reg = SX9500_REG_PROX_CTRL3,
|
||||
/* Doze enabled, 2x scan period doze, no raw filter. */
|
||||
.def = 0x40,
|
||||
},
|
||||
{
|
||||
.reg = SX9500_REG_PROX_CTRL4,
|
||||
/* Average threshold. */
|
||||
.def = 0x30,
|
||||
},
|
||||
{
|
||||
.reg = SX9500_REG_PROX_CTRL5,
|
||||
/*
|
||||
* Debouncer off, lowest average negative filter,
|
||||
* highest average postive filter.
|
||||
*/
|
||||
.def = 0x0f,
|
||||
},
|
||||
{
|
||||
.reg = SX9500_REG_PROX_CTRL6,
|
||||
/* Proximity detection threshold: 280 */
|
||||
.def = 0x0e,
|
||||
},
|
||||
{
|
||||
.reg = SX9500_REG_PROX_CTRL7,
|
||||
/*
|
||||
* No automatic compensation, compensate each pin
|
||||
* independently, proximity hysteresis: 32, close
|
||||
* debouncer off, far debouncer off.
|
||||
*/
|
||||
.def = 0x00,
|
||||
},
|
||||
{
|
||||
.reg = SX9500_REG_PROX_CTRL8,
|
||||
/* No stuck timeout, no periodic compensation. */
|
||||
.def = 0x00,
|
||||
},
|
||||
{
|
||||
.reg = SX9500_REG_PROX_CTRL0,
|
||||
/* Scan period: 30ms, all sensors enabled. */
|
||||
.def = 0x0f,
|
||||
},
|
||||
};
|
||||
|
||||
static int sx9500_init_device(struct iio_dev *indio_dev)
|
||||
{
|
||||
struct sx9500_data *data = iio_priv(indio_dev);
|
||||
int ret, i;
|
||||
unsigned int val;
|
||||
|
||||
ret = regmap_write(data->regmap, SX9500_REG_IRQ_MSK, 0);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = regmap_write(data->regmap, SX9500_REG_RESET,
|
||||
SX9500_SOFT_RESET);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(sx9500_default_regs); i++) {
|
||||
ret = regmap_write(data->regmap,
|
||||
sx9500_default_regs[i].reg,
|
||||
sx9500_default_regs[i].def);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sx9500_gpio_probe(struct i2c_client *client,
|
||||
struct sx9500_data *data)
|
||||
{
|
||||
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, SX9500_GPIO_NAME, 0);
|
||||
if (IS_ERR(gpio)) {
|
||||
dev_err(dev, "acpi gpio get index failed\n");
|
||||
return PTR_ERR(gpio);
|
||||
}
|
||||
|
||||
ret = gpiod_direction_input(gpio);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = gpiod_to_irq(gpio);
|
||||
|
||||
dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sx9500_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
int ret;
|
||||
struct iio_dev *indio_dev;
|
||||
struct sx9500_data *data;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
||||
if (indio_dev == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
data = iio_priv(indio_dev);
|
||||
data->client = client;
|
||||
mutex_init(&data->mutex);
|
||||
data->trigger_enabled = false;
|
||||
|
||||
data->regmap = devm_regmap_init_i2c(client, &sx9500_regmap_config);
|
||||
if (IS_ERR(data->regmap))
|
||||
return PTR_ERR(data->regmap);
|
||||
|
||||
sx9500_init_device(indio_dev);
|
||||
|
||||
indio_dev->dev.parent = &client->dev;
|
||||
indio_dev->name = SX9500_DRIVER_NAME;
|
||||
indio_dev->channels = sx9500_channels;
|
||||
indio_dev->num_channels = ARRAY_SIZE(sx9500_channels);
|
||||
indio_dev->info = &sx9500_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
i2c_set_clientdata(client, indio_dev);
|
||||
|
||||
if (client->irq <= 0)
|
||||
client->irq = sx9500_gpio_probe(client, data);
|
||||
|
||||
if (client->irq > 0) {
|
||||
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
||||
sx9500_irq_handler, sx9500_irq_thread_handler,
|
||||
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
||||
SX9500_IRQ_NAME, indio_dev);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
data->trig = devm_iio_trigger_alloc(&client->dev,
|
||||
"%s-dev%d", indio_dev->name, indio_dev->id);
|
||||
if (!data->trig)
|
||||
return -ENOMEM;
|
||||
|
||||
data->trig->dev.parent = &client->dev;
|
||||
data->trig->ops = &sx9500_trigger_ops;
|
||||
iio_trigger_set_drvdata(data->trig, indio_dev);
|
||||
|
||||
ret = iio_trigger_register(data->trig);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = iio_triggered_buffer_setup(indio_dev, NULL,
|
||||
sx9500_trigger_handler, NULL);
|
||||
if (ret < 0)
|
||||
goto out_trigger_unregister;
|
||||
|
||||
ret = iio_device_register(indio_dev);
|
||||
if (ret < 0)
|
||||
goto out_buffer_cleanup;
|
||||
|
||||
return 0;
|
||||
|
||||
out_buffer_cleanup:
|
||||
iio_triggered_buffer_cleanup(indio_dev);
|
||||
out_trigger_unregister:
|
||||
if (client->irq > 0)
|
||||
iio_trigger_unregister(data->trig);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sx9500_remove(struct i2c_client *client)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
||||
struct sx9500_data *data = iio_priv(indio_dev);
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
iio_triggered_buffer_cleanup(indio_dev);
|
||||
if (client->irq > 0)
|
||||
iio_trigger_unregister(data->trig);
|
||||
kfree(data->buffer);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct acpi_device_id sx9500_acpi_match[] = {
|
||||
{"SSX9500", 0},
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(acpi, sx9500_acpi_match);
|
||||
|
||||
static const struct i2c_device_id sx9500_id[] = {
|
||||
{"sx9500", 0},
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, sx9500_id);
|
||||
|
||||
static struct i2c_driver sx9500_driver = {
|
||||
.driver = {
|
||||
.name = SX9500_DRIVER_NAME,
|
||||
.acpi_match_table = ACPI_PTR(sx9500_acpi_match),
|
||||
},
|
||||
.probe = sx9500_probe,
|
||||
.remove = sx9500_remove,
|
||||
.id_table = sx9500_id,
|
||||
};
|
||||
module_i2c_driver(sx9500_driver);
|
||||
|
||||
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
|
||||
MODULE_DESCRIPTION("Driver for Semtech SX9500 proximity sensor");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue