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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright 2018 Google LLC.
- *
- * Driver for Semtech's SX9310/SX9311 capacitive proximity/button solution.
- * Based on SX9500 driver and Semtech driver using the input framework
- * <https://my.syncplicity.com/share/teouwsim8niiaud/
- * linux-driver-SX9310_NoSmartHSensing>.
- * Reworked in April 2019 by Evan Green <evgreen@chromium.org>
- * 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/kernel.h>
- #include <linux/mod_devicetable.h>
- #include <linux/module.h>
- #include <linux/pm.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>
- /* Register definitions. */
- #define SX9310_REG_IRQ_SRC 0x00
- #define SX9310_REG_STAT0 0x01
- #define SX9310_REG_STAT1 0x02
- #define SX9310_REG_STAT1_COMPSTAT_MASK GENMASK(3, 0)
- #define SX9310_REG_IRQ_MSK 0x03
- #define SX9310_CONVDONE_IRQ BIT(3)
- #define SX9310_FAR_IRQ BIT(5)
- #define SX9310_CLOSE_IRQ BIT(6)
- #define SX9310_REG_IRQ_FUNC 0x04
- #define SX9310_REG_PROX_CTRL0 0x10
- #define SX9310_REG_PROX_CTRL0_SENSOREN_MASK GENMASK(3, 0)
- #define SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK GENMASK(7, 4)
- #define SX9310_REG_PROX_CTRL0_SCANPERIOD_15MS 0x01
- #define SX9310_REG_PROX_CTRL1 0x11
- #define SX9310_REG_PROX_CTRL2 0x12
- #define SX9310_REG_PROX_CTRL2_COMBMODE_CS1_CS2 (0x02 << 6)
- #define SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC (0x01 << 2)
- #define SX9310_REG_PROX_CTRL3 0x13
- #define SX9310_REG_PROX_CTRL3_GAIN0_X8 (0x03 << 2)
- #define SX9310_REG_PROX_CTRL3_GAIN12_X4 0x02
- #define SX9310_REG_PROX_CTRL4 0x14
- #define SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST 0x07
- #define SX9310_REG_PROX_CTRL5 0x15
- #define SX9310_REG_PROX_CTRL5_RANGE_SMALL (0x03 << 6)
- #define SX9310_REG_PROX_CTRL5_STARTUPSENS_CS1 (0x01 << 2)
- #define SX9310_REG_PROX_CTRL5_RAWFILT_1P25 0x02
- #define SX9310_REG_PROX_CTRL6 0x16
- #define SX9310_REG_PROX_CTRL6_AVGTHRESH_DEFAULT 0x20
- #define SX9310_REG_PROX_CTRL7 0x17
- #define SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 (0x01 << 3)
- #define SX9310_REG_PROX_CTRL7_AVGPOSFILT_512 0x05
- #define SX9310_REG_PROX_CTRL8 0x18
- #define SX9310_REG_PROX_CTRL9 0x19
- #define SX9310_REG_PROX_CTRL8_9_PTHRESH_28 (0x08 << 3)
- #define SX9310_REG_PROX_CTRL8_9_PTHRESH_96 (0x11 << 3)
- #define SX9310_REG_PROX_CTRL8_9_BODYTHRESH_900 0x03
- #define SX9310_REG_PROX_CTRL8_9_BODYTHRESH_1500 0x05
- #define SX9310_REG_PROX_CTRL10 0x1a
- #define SX9310_REG_PROX_CTRL10_HYST_6PCT (0x01 << 4)
- #define SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_2 0x01
- #define SX9310_REG_PROX_CTRL11 0x1b
- #define SX9310_REG_PROX_CTRL12 0x1c
- #define SX9310_REG_PROX_CTRL13 0x1d
- #define SX9310_REG_PROX_CTRL14 0x1e
- #define SX9310_REG_PROX_CTRL15 0x1f
- #define SX9310_REG_PROX_CTRL16 0x20
- #define SX9310_REG_PROX_CTRL17 0x21
- #define SX9310_REG_PROX_CTRL18 0x22
- #define SX9310_REG_PROX_CTRL19 0x23
- #define SX9310_REG_SAR_CTRL0 0x2a
- #define SX9310_REG_SAR_CTRL0_SARDEB_4_SAMPLES (0x02 << 5)
- #define SX9310_REG_SAR_CTRL0_SARHYST_8 (0x02 << 3)
- #define SX9310_REG_SAR_CTRL1 0x2b
- /* Each increment of the slope register is 0.0078125. */
- #define SX9310_REG_SAR_CTRL1_SLOPE(_hnslope) (_hnslope / 78125)
- #define SX9310_REG_SAR_CTRL2 0x2c
- #define SX9310_REG_SAR_CTRL2_SAROFFSET_DEFAULT 0x3c
- #define SX9310_REG_SENSOR_SEL 0x30
- #define SX9310_REG_USE_MSB 0x31
- #define SX9310_REG_USE_LSB 0x32
- #define SX9310_REG_AVG_MSB 0x33
- #define SX9310_REG_AVG_LSB 0x34
- #define SX9310_REG_DIFF_MSB 0x35
- #define SX9310_REG_DIFF_LSB 0x36
- #define SX9310_REG_OFFSET_MSB 0x37
- #define SX9310_REG_OFFSET_LSB 0x38
- #define SX9310_REG_SAR_MSB 0x39
- #define SX9310_REG_SAR_LSB 0x3a
- #define SX9310_REG_I2C_ADDR 0x40
- #define SX9310_REG_PAUSE 0x41
- #define SX9310_REG_WHOAMI 0x42
- #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_EITHER,
- .mask_separate = BIT(IIO_EV_INFO_ENABLE),
- },
- };
- #define SX9310_NAMED_CHANNEL(idx, name) \
- { \
- .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, \
- .extend_name = name, \
- .address = SX9310_REG_DIFF_MSB, \
- .event_spec = sx9310_events, \
- .num_event_specs = ARRAY_SIZE(sx9310_events), \
- .scan_index = idx, \
- .scan_type = { \
- .sign = 's', \
- .realbits = 12, \
- .storagebits = 16, \
- .endianness = IIO_BE, \
- }, \
- }
- #define SX9310_CHANNEL(idx) SX9310_NAMED_CHANNEL(idx, NULL)
- static const struct iio_chan_spec sx9310_channels[] = {
- SX9310_CHANNEL(0), /* CS0 */
- SX9310_CHANNEL(1), /* CS1 */
- SX9310_CHANNEL(2), /* CS2 */
- SX9310_NAMED_CHANNEL(3, "comb"), /* COMB */
- IIO_CHAN_SOFT_TIMESTAMP(4),
- };
- /*
- * Each entry contains the integer part (val) and the fractional part, in micro
- * seconds. It conforms to the IIO output IIO_VAL_INT_PLUS_MICRO.
- */
- static const struct {
- int val;
- int val2;
- } sx9310_samp_freq_table[] = {
- { 500, 0 }, /* 0000: Min (no idle time) */
- { 66, 666666 }, /* 0001: 15 ms */
- { 33, 333333 }, /* 0010: 30 ms (Typ.) */
- { 22, 222222 }, /* 0011: 45 ms */
- { 16, 666666 }, /* 0100: 60 ms */
- { 11, 111111 }, /* 0101: 90 ms */
- { 8, 333333 }, /* 0110: 120 ms */
- { 5, 0 }, /* 0111: 200 ms */
- { 2, 500000 }, /* 1000: 400 ms */
- { 1, 666666 }, /* 1001: 600 ms */
- { 1, 250000 }, /* 1010: 800 ms */
- { 1, 0 }, /* 1011: 1 s */
- { 0, 500000 }, /* 1100: 2 s */
- { 0, 333333 }, /* 1101: 3 s */
- { 0, 250000 }, /* 1110: 4 s */
- { 0, 200000 }, /* 1111: 5 s */
- };
- static const unsigned int sx9310_scan_period_table[] = {
- 2, 15, 30, 45, 60, 90, 120, 200,
- 400, 600, 800, 1000, 2000, 3000, 4000, 5000,
- };
- static ssize_t sx9310_show_samp_freq_avail(struct device *dev,
- struct device_attribute *attr,
- char *buf)
- {
- size_t len = 0;
- int i;
- for (i = 0; i < ARRAY_SIZE(sx9310_samp_freq_table); i++)
- len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%d ",
- sx9310_samp_freq_table[i].val,
- sx9310_samp_freq_table[i].val2);
- buf[len - 1] = '\n';
- return len;
- }
- static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sx9310_show_samp_freq_avail);
- static const struct regmap_range sx9310_writable_reg_ranges[] = {
- regmap_reg_range(SX9310_REG_IRQ_MSK, SX9310_REG_IRQ_FUNC),
- regmap_reg_range(SX9310_REG_PROX_CTRL0, SX9310_REG_PROX_CTRL19),
- regmap_reg_range(SX9310_REG_SAR_CTRL0, SX9310_REG_SAR_CTRL2),
- regmap_reg_range(SX9310_REG_SENSOR_SEL, SX9310_REG_SENSOR_SEL),
- regmap_reg_range(SX9310_REG_OFFSET_MSB, SX9310_REG_OFFSET_LSB),
- regmap_reg_range(SX9310_REG_PAUSE, SX9310_REG_PAUSE),
- regmap_reg_range(SX9310_REG_RESET, SX9310_REG_RESET),
- };
- static const struct regmap_access_table sx9310_writeable_regs = {
- .yes_ranges = sx9310_writable_reg_ranges,
- .n_yes_ranges = ARRAY_SIZE(sx9310_writable_reg_ranges),
- };
- static const struct regmap_range sx9310_readable_reg_ranges[] = {
- regmap_reg_range(SX9310_REG_IRQ_SRC, SX9310_REG_IRQ_FUNC),
- regmap_reg_range(SX9310_REG_PROX_CTRL0, SX9310_REG_PROX_CTRL19),
- regmap_reg_range(SX9310_REG_SAR_CTRL0, SX9310_REG_SAR_CTRL2),
- regmap_reg_range(SX9310_REG_SENSOR_SEL, SX9310_REG_SAR_LSB),
- regmap_reg_range(SX9310_REG_I2C_ADDR, SX9310_REG_WHOAMI),
- regmap_reg_range(SX9310_REG_RESET, SX9310_REG_RESET),
- };
- static const struct regmap_access_table sx9310_readable_regs = {
- .yes_ranges = sx9310_readable_reg_ranges,
- .n_yes_ranges = ARRAY_SIZE(sx9310_readable_reg_ranges),
- };
- static const struct regmap_range sx9310_volatile_reg_ranges[] = {
- regmap_reg_range(SX9310_REG_IRQ_SRC, SX9310_REG_STAT1),
- regmap_reg_range(SX9310_REG_USE_MSB, SX9310_REG_DIFF_LSB),
- regmap_reg_range(SX9310_REG_SAR_MSB, SX9310_REG_SAR_LSB),
- regmap_reg_range(SX9310_REG_RESET, SX9310_REG_RESET),
- };
- static const struct regmap_access_table sx9310_volatile_regs = {
- .yes_ranges = sx9310_volatile_reg_ranges,
- .n_yes_ranges = ARRAY_SIZE(sx9310_volatile_reg_ranges),
- };
- static const struct regmap_config sx9310_regmap_config = {
- .reg_bits = 8,
- .val_bits = 8,
- .max_register = SX9310_REG_RESET,
- .cache_type = REGCACHE_RBTREE,
- .wr_table = &sx9310_writeable_regs,
- .rd_table = &sx9310_readable_regs,
- .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,
- const struct iio_chan_spec *chan, __be16 *val)
- {
- int ret;
- ret = regmap_write(data->regmap, SX9310_REG_SENSOR_SEL, chan->channel);
- if (ret)
- return ret;
- return regmap_bulk_read(data->regmap, chan->address, val, sizeof(*val));
- }
- /*
- * 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)
- {
- int ret;
- unsigned int val;
- ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &val);
- if (ret)
- return ret;
- val = FIELD_GET(SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK, val);
- msleep(sx9310_scan_period_table[val]);
- 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_samp_freq(struct sx9310_data *data, int *val, int *val2)
- {
- unsigned int regval;
- int ret;
- ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, ®val);
- if (ret)
- return ret;
- regval = FIELD_GET(SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK, regval);
- *val = sx9310_samp_freq_table[regval].val;
- *val2 = sx9310_samp_freq_table[regval].val2;
- return IIO_VAL_INT_PLUS_MICRO;
- }
- 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);
- int ret;
- if (chan->type != IIO_PROXIMITY)
- return -EINVAL;
- switch (mask) {
- case IIO_CHAN_INFO_RAW:
- ret = iio_device_claim_direct_mode(indio_dev);
- if (ret)
- return ret;
- ret = sx9310_read_proximity(data, chan, val);
- iio_device_release_direct_mode(indio_dev);
- return ret;
- case IIO_CHAN_INFO_SAMP_FREQ:
- return sx9310_read_samp_freq(data, val, val2);
- default:
- return -EINVAL;
- }
- }
- static int sx9310_set_samp_freq(struct sx9310_data *data, int val, int val2)
- {
- int i, ret;
- for (i = 0; i < ARRAY_SIZE(sx9310_samp_freq_table); i++)
- if (val == sx9310_samp_freq_table[i].val &&
- val2 == sx9310_samp_freq_table[i].val2)
- break;
- if (i == ARRAY_SIZE(sx9310_samp_freq_table))
- return -EINVAL;
- mutex_lock(&data->mutex);
- ret = regmap_update_bits(
- data->regmap, SX9310_REG_PROX_CTRL0,
- SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK,
- FIELD_PREP(SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK, i));
- mutex_unlock(&data->mutex);
- return ret;
- }
- 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);
- if (chan->type != IIO_PROXIMITY)
- return -EINVAL;
- if (mask != IIO_CHAN_INFO_SAMP_FREQ)
- return -EINVAL;
- return sx9310_set_samp_freq(data, val, val2);
- }
- 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 struct attribute *sx9310_attributes[] = {
- &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
- NULL
- };
- static const struct attribute_group sx9310_attribute_group = {
- .attrs = sx9310_attributes,
- };
- static const struct iio_info sx9310_info = {
- .attrs = &sx9310_attribute_group,
- .read_raw = sx9310_read_raw,
- .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[] = {
- { SX9310_REG_IRQ_MSK, 0x00 },
- { SX9310_REG_IRQ_FUNC, 0x00 },
- /*
- * The lower 4 bits should not be set as it enable sensors measurements.
- * Turning the detection on before the configuration values are set to
- * good values can cause the device to return erroneous readings.
- */
- { SX9310_REG_PROX_CTRL0, SX9310_REG_PROX_CTRL0_SCANPERIOD_15MS },
- { SX9310_REG_PROX_CTRL1, 0x00 },
- { SX9310_REG_PROX_CTRL2, SX9310_REG_PROX_CTRL2_COMBMODE_CS1_CS2 |
- SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC },
- { SX9310_REG_PROX_CTRL3, SX9310_REG_PROX_CTRL3_GAIN0_X8 |
- SX9310_REG_PROX_CTRL3_GAIN12_X4 },
- { SX9310_REG_PROX_CTRL4, SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST },
- { SX9310_REG_PROX_CTRL5, SX9310_REG_PROX_CTRL5_RANGE_SMALL |
- SX9310_REG_PROX_CTRL5_STARTUPSENS_CS1 |
- SX9310_REG_PROX_CTRL5_RAWFILT_1P25 },
- { SX9310_REG_PROX_CTRL6, SX9310_REG_PROX_CTRL6_AVGTHRESH_DEFAULT },
- { SX9310_REG_PROX_CTRL7, SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 |
- SX9310_REG_PROX_CTRL7_AVGPOSFILT_512 },
- { SX9310_REG_PROX_CTRL8, SX9310_REG_PROX_CTRL8_9_PTHRESH_96 |
- SX9310_REG_PROX_CTRL8_9_BODYTHRESH_1500 },
- { SX9310_REG_PROX_CTRL9, SX9310_REG_PROX_CTRL8_9_PTHRESH_28 |
- SX9310_REG_PROX_CTRL8_9_BODYTHRESH_900 },
- { SX9310_REG_PROX_CTRL10, SX9310_REG_PROX_CTRL10_HYST_6PCT |
- SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_2 },
- { SX9310_REG_PROX_CTRL11, 0x00 },
- { SX9310_REG_PROX_CTRL12, 0x00 },
- { SX9310_REG_PROX_CTRL13, 0x00 },
- { SX9310_REG_PROX_CTRL14, 0x00 },
- { SX9310_REG_PROX_CTRL15, 0x00 },
- { SX9310_REG_PROX_CTRL16, 0x00 },
- { SX9310_REG_PROX_CTRL17, 0x00 },
- { SX9310_REG_PROX_CTRL18, 0x00 },
- { SX9310_REG_PROX_CTRL19, 0x00 },
- { SX9310_REG_SAR_CTRL0, SX9310_REG_SAR_CTRL0_SARDEB_4_SAMPLES |
- SX9310_REG_SAR_CTRL0_SARHYST_8 },
- { SX9310_REG_SAR_CTRL1, SX9310_REG_SAR_CTRL1_SLOPE(10781250) },
- { SX9310_REG_SAR_CTRL2, SX9310_REG_SAR_CTRL2_SAROFFSET_DEFAULT },
- };
- /* 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);
- int ret;
- unsigned int val;
- unsigned int ctrl0;
- ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &ctrl0);
- if (ret)
- return ret;
- /* run the compensation phase on all channels */
- ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0,
- ctrl0 | SX9310_REG_PROX_CTRL0_SENSOREN_MASK);
- if (ret)
- return ret;
- 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);
- return ret;
- }
- regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
- return ret;
- }
- static int sx9310_init_device(struct iio_dev *indio_dev)
- {
- struct sx9310_data *data = iio_priv(indio_dev);
- 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_default_regs[i];
- 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)
- {
- unsigned int long ddata;
- 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;
- }
- switch (whoami) {
- case SX9310_WHOAMI_VALUE:
- indio_dev->name = "sx9310";
- break;
- case SX9311_WHOAMI_VALUE:
- 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;
- regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies);
- }
- 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,
- indio_dev->id);
- if (!data->trig)
- return -ENOMEM;
- data->trig->dev.parent = dev;
- 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);
- }
- 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);
- u8 ctrl0;
- int ret;
- disable_irq_nosync(data->client->irq);
- mutex_lock(&data->mutex);
- ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0,
- &data->suspend_ctrl0);
- if (ret)
- goto out;
- ctrl0 = data->suspend_ctrl0 & ~SX9310_REG_PROX_CTRL0_SENSOREN_MASK;
- ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
- if (ret)
- goto out;
- ret = regmap_write(data->regmap, SX9310_REG_PAUSE, 0);
- out:
- mutex_unlock(&data->mutex);
- return ret;
- }
- 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);
- int ret;
- mutex_lock(&data->mutex);
- ret = regmap_write(data->regmap, SX9310_REG_PAUSE, 1);
- if (ret)
- goto out;
- ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0,
- data->suspend_ctrl0);
- out:
- mutex_unlock(&data->mutex);
- if (ret)
- return ret;
- enable_irq(data->client->irq);
- return 0;
- }
- static const struct dev_pm_ops sx9310_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(sx9310_suspend, sx9310_resume)
- };
- static const struct acpi_device_id sx9310_acpi_match[] = {
- { "STH9310", SX9310_WHOAMI_VALUE },
- { "STH9311", SX9311_WHOAMI_VALUE },
- {}
- };
- MODULE_DEVICE_TABLE(acpi, sx9310_acpi_match);
- static const struct of_device_id sx9310_of_match[] = {
- { .compatible = "semtech,sx9310", (void *)SX9310_WHOAMI_VALUE },
- { .compatible = "semtech,sx9311", (void *)SX9311_WHOAMI_VALUE },
- {}
- };
- MODULE_DEVICE_TABLE(of, sx9310_of_match);
- static const struct i2c_device_id sx9310_id[] = {
- { "sx9310", SX9310_WHOAMI_VALUE },
- { "sx9311", SX9311_WHOAMI_VALUE },
- {}
- };
- MODULE_DEVICE_TABLE(i2c, sx9310_id);
- static struct i2c_driver sx9310_driver = {
- .driver = {
- .name = "sx9310",
- .acpi_match_table = sx9310_acpi_match,
- .of_match_table = sx9310_of_match,
- .pm = &sx9310_pm_ops,
- /*
- * Lots of i2c transfers in probe + over 200 ms waiting in
- * sx9310_init_compensation() mean a slow probe; prefer async
- * so we don't delay boot if we're builtin to the kernel.
- */
- .probe_type = PROBE_PREFER_ASYNCHRONOUS,
- },
- .probe_new = sx9310_probe,
- .id_table = sx9310_id,
- };
- module_i2c_driver(sx9310_driver);
- 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");
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