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-rw-r--r--drivers/iio/proximity/sx9500.c1067
1 files changed, 1067 insertions, 0 deletions
diff --git a/drivers/iio/proximity/sx9500.c b/drivers/iio/proximity/sx9500.c
new file mode 100644
index 000000000..d4670864d
--- /dev/null
+++ b/drivers/iio/proximity/sx9500.c
@@ -0,0 +1,1067 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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>.
+ */
+
+#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/pm.h>
+#include <linux/delay.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"
+
+/* 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_COMPSTAT_MASK GENMASK(3, 0)
+
+#define SX9500_NUM_CHANNELS 4
+#define SX9500_CHAN_MASK GENMASK(SX9500_NUM_CHANNELS - 1, 0)
+
+struct sx9500_data {
+ struct mutex mutex;
+ struct i2c_client *client;
+ struct iio_trigger *trig;
+ struct regmap *regmap;
+ struct gpio_desc *gpiod_rst;
+ /*
+ * 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;
+ /* Remember enabled channels and sample rate during suspend. */
+ unsigned int suspend_ctrl0;
+ struct completion completion;
+ int data_rdy_users, close_far_users;
+ int channel_users[SX9500_NUM_CHANNELS];
+};
+
+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 unsigned int sx9500_scan_period_table[] = {
+ 30, 60, 90, 120, 150, 200, 300, 400,
+};
+
+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_inc_users(struct sx9500_data *data, int *counter,
+ unsigned int reg, unsigned int bitmask)
+{
+ (*counter)++;
+ if (*counter != 1)
+ /* Bit is already active, nothing to do. */
+ return 0;
+
+ return regmap_update_bits(data->regmap, reg, bitmask, bitmask);
+}
+
+static int sx9500_dec_users(struct sx9500_data *data, int *counter,
+ unsigned int reg, unsigned int bitmask)
+{
+ (*counter)--;
+ if (*counter != 0)
+ /* There are more users, do not deactivate. */
+ return 0;
+
+ return regmap_update_bits(data->regmap, reg, bitmask, 0);
+}
+
+static int sx9500_inc_chan_users(struct sx9500_data *data, int chan)
+{
+ return sx9500_inc_users(data, &data->channel_users[chan],
+ SX9500_REG_PROX_CTRL0, BIT(chan));
+}
+
+static int sx9500_dec_chan_users(struct sx9500_data *data, int chan)
+{
+ return sx9500_dec_users(data, &data->channel_users[chan],
+ SX9500_REG_PROX_CTRL0, BIT(chan));
+}
+
+static int sx9500_inc_data_rdy_users(struct sx9500_data *data)
+{
+ return sx9500_inc_users(data, &data->data_rdy_users,
+ SX9500_REG_IRQ_MSK, SX9500_CONVDONE_IRQ);
+}
+
+static int sx9500_dec_data_rdy_users(struct sx9500_data *data)
+{
+ return sx9500_dec_users(data, &data->data_rdy_users,
+ SX9500_REG_IRQ_MSK, SX9500_CONVDONE_IRQ);
+}
+
+static int sx9500_inc_close_far_users(struct sx9500_data *data)
+{
+ return sx9500_inc_users(data, &data->close_far_users,
+ SX9500_REG_IRQ_MSK,
+ SX9500_CLOSE_IRQ | SX9500_FAR_IRQ);
+}
+
+static int sx9500_dec_close_far_users(struct sx9500_data *data)
+{
+ return sx9500_dec_users(data, &data->close_far_users,
+ SX9500_REG_IRQ_MSK,
+ SX9500_CLOSE_IRQ | SX9500_FAR_IRQ);
+}
+
+static int sx9500_read_prox_data(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, &regval, 2);
+ if (ret < 0)
+ return ret;
+
+ *val = be16_to_cpu(regval);
+
+ return IIO_VAL_INT;
+}
+
+/*
+ * If we have no interrupt support, we have to wait for a scan period
+ * after enabling a channel to get a result.
+ */
+static int sx9500_wait_for_sample(struct sx9500_data *data)
+{
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, &val);
+ if (ret < 0)
+ return ret;
+
+ val = (val & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT;
+
+ msleep(sx9500_scan_period_table[val]);
+
+ return 0;
+}
+
+static int sx9500_read_proximity(struct sx9500_data *data,
+ const struct iio_chan_spec *chan,
+ int *val)
+{
+ int ret;
+
+ mutex_lock(&data->mutex);
+
+ ret = sx9500_inc_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out;
+
+ ret = sx9500_inc_data_rdy_users(data);
+ if (ret < 0)
+ goto out_dec_chan;
+
+ mutex_unlock(&data->mutex);
+
+ if (data->client->irq > 0)
+ ret = wait_for_completion_interruptible(&data->completion);
+ else
+ ret = sx9500_wait_for_sample(data);
+
+ mutex_lock(&data->mutex);
+
+ if (ret < 0)
+ goto out_dec_data_rdy;
+
+ ret = sx9500_read_prox_data(data, chan, val);
+ if (ret < 0)
+ goto out_dec_data_rdy;
+
+ ret = sx9500_dec_data_rdy_users(data);
+ if (ret < 0)
+ goto out_dec_chan;
+
+ ret = sx9500_dec_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out;
+
+ ret = IIO_VAL_INT;
+
+ goto out;
+
+out_dec_data_rdy:
+ sx9500_dec_data_rdy_users(data);
+out_dec_chan:
+ sx9500_dec_chan_users(data, chan->channel);
+out:
+ mutex_unlock(&data->mutex);
+ reinit_completion(&data->completion);
+
+ return ret;
+}
+
+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, &regval);
+ 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:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+ ret = sx9500_read_proximity(data, chan, val);
+ iio_device_release_direct_mode(indio_dev);
+ 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 void sx9500_push_events(struct iio_dev *indio_dev)
+{
+ int ret;
+ unsigned int val, chan;
+ struct sx9500_data *data = iio_priv(indio_dev);
+
+ ret = regmap_read(data->regmap, SX9500_REG_STAT, &val);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "i2c transfer error in irq\n");
+ return;
+ }
+
+ 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(indio_dev));
+ data->prox_stat[chan] = new_prox;
+ }
+}
+
+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;
+
+ 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))
+ sx9500_push_events(indio_dev);
+
+ if (val & SX9500_CONVDONE_IRQ)
+ complete(&data->completion);
+
+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;
+
+ if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH ||
+ dir != IIO_EV_DIR_EITHER)
+ return -EINVAL;
+
+ mutex_lock(&data->mutex);
+
+ if (state == 1) {
+ ret = sx9500_inc_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out_unlock;
+ ret = sx9500_inc_close_far_users(data);
+ if (ret < 0)
+ goto out_undo_chan;
+ } else {
+ ret = sx9500_dec_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out_unlock;
+ ret = sx9500_dec_close_far_users(data);
+ if (ret < 0)
+ goto out_undo_chan;
+ }
+
+ data->event_enabled[chan->channel] = state;
+ goto out_unlock;
+
+out_undo_chan:
+ if (state == 1)
+ sx9500_dec_chan_users(data, chan->channel);
+ else
+ sx9500_inc_chan_users(data, chan->channel);
+out_unlock:
+ 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 = {
+ .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);
+
+ if (state)
+ ret = sx9500_inc_data_rdy_users(data);
+ else
+ ret = sx9500_dec_data_rdy_users(data);
+ if (ret < 0)
+ goto out;
+
+ data->trigger_enabled = state;
+
+out:
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static const struct iio_trigger_ops sx9500_trigger_ops = {
+ .set_trigger_state = sx9500_set_trigger_state,
+};
+
+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->active_scan_mask,
+ indio_dev->masklength) {
+ ret = sx9500_read_prox_data(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(indio_dev));
+
+out:
+ mutex_unlock(&data->mutex);
+
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int sx9500_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret = 0, i;
+
+ mutex_lock(&data->mutex);
+
+ for (i = 0; i < SX9500_NUM_CHANNELS; i++)
+ if (test_bit(i, indio_dev->active_scan_mask)) {
+ ret = sx9500_inc_chan_users(data, i);
+ if (ret)
+ break;
+ }
+
+ if (ret)
+ for (i = i - 1; i >= 0; i--)
+ if (test_bit(i, indio_dev->active_scan_mask))
+ sx9500_dec_chan_users(data, i);
+
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int sx9500_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret = 0, i;
+
+ mutex_lock(&data->mutex);
+
+ for (i = 0; i < SX9500_NUM_CHANNELS; i++)
+ if (test_bit(i, indio_dev->active_scan_mask)) {
+ ret = sx9500_dec_chan_users(data, i);
+ if (ret)
+ break;
+ }
+
+ if (ret)
+ for (i = i - 1; i >= 0; i--)
+ if (test_bit(i, indio_dev->active_scan_mask))
+ sx9500_inc_chan_users(data, i);
+
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static const struct iio_buffer_setup_ops sx9500_buffer_setup_ops = {
+ .postenable = sx9500_buffer_postenable,
+ .predisable = sx9500_buffer_predisable,
+};
+
+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 positive 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 disabled. */
+ .def = 0x00,
+ },
+};
+
+/* Activate all channels and perform an initial compensation. */
+static int sx9500_init_compensation(struct iio_dev *indio_dev)
+{
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int i, ret;
+ unsigned int val;
+
+ ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
+ SX9500_CHAN_MASK, SX9500_CHAN_MASK);
+ if (ret < 0)
+ return ret;
+
+ for (i = 10; i >= 0; i--) {
+ usleep_range(10000, 20000);
+ ret = regmap_read(data->regmap, SX9500_REG_STAT, &val);
+ if (ret < 0)
+ goto out;
+ if (!(val & SX9500_COMPSTAT_MASK))
+ break;
+ }
+
+ if (i < 0) {
+ dev_err(&data->client->dev, "initial compensation timed out");
+ ret = -ETIMEDOUT;
+ }
+
+out:
+ regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
+ SX9500_CHAN_MASK, 0);
+ return ret;
+}
+
+static int sx9500_init_device(struct iio_dev *indio_dev)
+{
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret, i;
+ unsigned int val;
+
+ if (data->gpiod_rst) {
+ gpiod_set_value_cansleep(data->gpiod_rst, 0);
+ usleep_range(1000, 2000);
+ gpiod_set_value_cansleep(data->gpiod_rst, 1);
+ usleep_range(1000, 2000);
+ }
+
+ 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 sx9500_init_compensation(indio_dev);
+}
+
+static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
+static const struct acpi_gpio_params interrupt_gpios = { 2, 0, false };
+
+static const struct acpi_gpio_mapping acpi_sx9500_gpios[] = {
+ { "reset-gpios", &reset_gpios, 1 },
+ /*
+ * Some platforms have a bug in ACPI GPIO description making IRQ
+ * GPIO to be output only. Ask the GPIO core to ignore this limit.
+ */
+ { "interrupt-gpios", &interrupt_gpios, 1, ACPI_GPIO_QUIRK_NO_IO_RESTRICTION },
+ { },
+};
+
+static void sx9500_gpio_probe(struct i2c_client *client,
+ struct sx9500_data *data)
+{
+ struct gpio_desc *gpiod_int;
+ struct device *dev;
+ int ret;
+
+ if (!client)
+ return;
+
+ dev = &client->dev;
+
+ ret = devm_acpi_dev_add_driver_gpios(dev, acpi_sx9500_gpios);
+ if (ret)
+ dev_dbg(dev, "Unable to add GPIO mapping table\n");
+
+ if (client->irq <= 0) {
+ gpiod_int = devm_gpiod_get(dev, "interrupt", GPIOD_IN);
+ if (IS_ERR(gpiod_int))
+ dev_err(dev, "gpio get irq failed\n");
+ else
+ client->irq = gpiod_to_irq(gpiod_int);
+ }
+
+ data->gpiod_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(data->gpiod_rst)) {
+ dev_warn(dev, "gpio get reset pin failed\n");
+ data->gpiod_rst = NULL;
+ }
+}
+
+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);
+ init_completion(&data->completion);
+ data->trigger_enabled = false;
+
+ data->regmap = devm_regmap_init_i2c(client, &sx9500_regmap_config);
+ if (IS_ERR(data->regmap))
+ return PTR_ERR(data->regmap);
+
+ 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);
+
+ sx9500_gpio_probe(client, data);
+
+ ret = sx9500_init_device(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ if (client->irq <= 0)
+ dev_warn(&client->dev, "no valid irq found\n");
+ else {
+ 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, iio_device_id(indio_dev));
+ if (!data->trig)
+ return -ENOMEM;
+
+ 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,
+ &sx9500_buffer_setup_ops);
+ 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 void 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);
+}
+
+static int sx9500_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0,
+ &data->suspend_ctrl0);
+ if (ret < 0)
+ goto out;
+
+ /*
+ * Scan period doesn't matter because when all the sensors are
+ * deactivated the device is in sleep mode.
+ */
+ ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0, 0);
+
+out:
+ mutex_unlock(&data->mutex);
+ return ret;
+}
+
+static int sx9500_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0,
+ data->suspend_ctrl0);
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(sx9500_pm_ops, sx9500_suspend, sx9500_resume);
+
+static const struct acpi_device_id sx9500_acpi_match[] = {
+ {"SSX9500", 0},
+ {"SASX9500", 0},
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, sx9500_acpi_match);
+
+static const struct of_device_id sx9500_of_match[] = {
+ { .compatible = "semtech,sx9500", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sx9500_of_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),
+ .of_match_table = of_match_ptr(sx9500_of_match),
+ .pm = pm_sleep_ptr(&sx9500_pm_ops),
+ },
+ .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");