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Date: Sat, 4 Apr 2020 15:35:57 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Daniel Campello <campello@...omium.org>
Cc: LKML <devicetree@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Gwendal Grignou <gwendal@...omium.org>,
Enrico Granata <egranata@...omium.org>,
Andreas Klinger <ak@...klinger.de>,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Thomas Gleixner <tglx@...utronix.de>, linux-iio@...r.kernel.org
Subject: Re: [PATCH 2/2 v6] iio: Add SEMTECH SX9310/9311 sensor driver
On Thu, 2 Apr 2020 17:01:30 -0600
Daniel Campello <campello@...omium.org> wrote:
> Add SEMTECH SX9310/9311 driver.
>
> The device has the following entry points:
>
> Usual frequency:
> - sampling_frequency
> - sampling_frequency_available
>
> Instant reading of current values for different sensors:
> - in_proximity0_raw
> - in_proximity1_raw
> - in_proximity2_raw
> - in_proximity3_comb_raw
> and associated events in events/
>
> Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
> Signed-off-by: Enrico Granata <egranata@...omium.org>
> Signed-off-by: Daniel Campello <campello@...omium.org>
> ---
> v6 changes:
> - Fixed formatting
> - Changed to make use of device_get_match_data()
> - Switched to ->probe_new()
Hi Daniel,
That covers about half of what Andy raised in his review.
I've highlighted a few of the other things inline, but all need to be
addressed. I'm not seeing a reply to v5 providing your arguments
against his suggested changes so I'm surprised to not see them addressed
in here.
There are questions in his review as well that need addressing even if
the answer is 'sure that will work ;)'
Thanks,
Jonathan
> v5 changes:
> - Fixed size of allocated buffer to include timestamp
> - Changed string comparison to whoami comparison when probing and
> assigning device name
> v4 changes:
> - Renamed in_proximity3_COMB_raw to in_proximity3_comb_raw and added
> documentation for it
> - Minor clean ups
> v3 changes:
> - Fixed "Using plain integer as NULL pointer"
> v2 changes:
> - Removed differential channels
> - Raw channels expose data from SX9310_REG_DIFF_MSB registers
> - 4th channel uses extend_name = COMB
> - Allocated data->buffer statically
> - Check whoami value against i2c / acpi device id
> - General clean up
>
> .../ABI/testing/sysfs-bus-iio-sx9310 | 10 +
> drivers/iio/proximity/Kconfig | 13 +
> drivers/iio/proximity/Makefile | 1 +
> drivers/iio/proximity/sx9310.c | 1049 +++++++++++++++++
> 4 files changed, 1073 insertions(+)
> create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-sx9310
> create mode 100644 drivers/iio/proximity/sx9310.c
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-sx9310 b/Documentation/ABI/testing/sysfs-bus-iio-sx9310
> new file mode 100644
> index 00000000000000..3ac7759013e5c4
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-iio-sx9310
> @@ -0,0 +1,10 @@
> +What: /sys/bus/iio/devices/iio:deviceX/in_proximity3_comb_raw
> +Date: February 2019
> +KernelVersion: 5.6
> +Contact: Daniel Campello <campello@...omium.org>
> +Description:
> + Proximity measurement indicating that some object is
> + near the combined sensor. The combined sensor presents
> + proximity measurements constructed by hardware by
> + combining measurements taken from a given set of
> + physical sensors.
> diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig
> index 37606d400805a9..d57e8cc17e42d6 100644
> --- a/drivers/iio/proximity/Kconfig
> +++ b/drivers/iio/proximity/Kconfig
> @@ -101,6 +101,19 @@ config SRF04
> To compile this driver as a module, choose M here: the
> module will be called srf04.
>
> +config SX9310
> + tristate "SX9310/SX9311 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 SX9310/SX9311 capacitive
> + proximity/button sensor.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called sx9310.
> +
> config SX9500
> tristate "SX9500 Semtech proximity sensor"
> select IIO_BUFFER
> diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile
> index c591b019304e7f..25e5a04da101c5 100644
> --- a/drivers/iio/proximity/Makefile
> +++ b/drivers/iio/proximity/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_PING) += ping.o
> obj-$(CONFIG_RFD77402) += rfd77402.o
> obj-$(CONFIG_SRF04) += srf04.o
> obj-$(CONFIG_SRF08) += srf08.o
> +obj-$(CONFIG_SX9310) += sx9310.o
> obj-$(CONFIG_SX9500) += sx9500.o
> obj-$(CONFIG_VL53L0X_I2C) += vl53l0x-i2c.o
>
> diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
> new file mode 100644
> index 00000000000000..7d31901e45df4a
> --- /dev/null
> +++ b/drivers/iio/proximity/sx9310.c
> @@ -0,0 +1,1049 @@
> +// 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 April 2019 by Evan Green <evgreen@...omium.org>
> + * and January 2020 by Daniel Campello <campello@...omium.org>
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/pm.h>
> +#include <linux/regmap.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_IRQ_MSK 0x03
> +#define SX9310_CONVDONE_IRQ BIT(3)
> +#define SX9310_FAR_IRQ BIT(5)
> +#define SX9310_CLOSE_IRQ BIT(6)
> +#define SX9310_EVENT_IRQ (SX9310_FAR_IRQ | SX9310_CLOSE_IRQ)
> +#define SX9310_REG_IRQ_FUNC 0x04
> +
> +#define SX9310_REG_PROX_CTRL0 0x10
> +#define SX9310_REG_PROX_CTRL0_PROXSTAT2 0x10
> +#define SX9310_REG_PROX_CTRL0_EN_MASK 0x0F
> +#define SX9310_REG_PROX_CTRL1 0x11
> +#define SX9310_REG_PROX_CTRL2 0x12
> +#define SX9310_REG_PROX_CTRL2_COMBMODE_ALL 0x80
> +#define SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC 0x04
> +#define SX9310_REG_PROX_CTRL3 0x13
> +#define SX9310_REG_PROX_CTRL3_GAIN0_X8 0x0c
> +#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 0xc0
> +#define SX9310_REG_PROX_CTRL5_STARTUPSENS_CS1 0x04
> +#define SX9310_REG_PROX_CTRL5_RAWFILT_1P25 0x02
> +#define SX9310_REG_PROX_CTRL6 0x16
> +#define SX9310_REG_PROX_CTRL6_COMP_COMMON 0x20
> +#define SX9310_REG_PROX_CTRL7 0x17
> +#define SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 0x08
> +#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_PTHRESH12_28 0x40
> +#define SX9310_REG_PROX_CTRL8_9_PTHRESH_96 0x88
> +#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 0x10
> +#define SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_8 0x12
> +#define SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_8 0x03
> +#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 0x40
> +#define SX9310_REG_SAR_CTRL0_SARHYST_8 0x10
> +#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_I2CADDR 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
> +
> +#define SX9310_SCAN_PERIOD_MASK GENMASK(7, 4)
> +#define SX9310_SCAN_PERIOD_SHIFT 4
> +
> +#define SX9310_COMPSTAT_MASK GENMASK(3, 0)
> +
> +/* 4 hardware channels, as defined in STAT0: COMB, CS2, CS1 and CS0. */
> +#define SX9310_NUM_CHANNELS 4
> +#define SX9310_CHAN_ENABLED_MASK GENMASK(3, 0)
> +
> +struct sx9310_data {
> + /* Serialize access to registers and channel configuration */
> + 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[SX9310_NUM_CHANNELS];
> + bool trigger_enabled;
> + /* 64-bit data + 64-bit timestamp buffer */
> + __be16 buffer[SX9310_NUM_CHANNELS + 4];
> + /* Remember enabled channels and sample rate during suspend. */
> + unsigned int suspend_ctrl0;
> + struct completion completion;
> + unsigned long chan_read, chan_event;
> + int channel_users[SX9310_NUM_CHANNELS];
> + 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_I2CADDR, 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_CHAN_ENABLED_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)
> +{
> + return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, irq);
> +}
> +
> +static int sx9310_disable_irq(struct sx9310_data *data, unsigned int irq)
> +{
> + 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 < 0)
> + return ret;
> +
> + return regmap_bulk_read(data->regmap, chan->address, val,
> + sizeof(__be16));
> +}
> +
> +/*
> + * 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 < 0)
> + return ret;
> +
> + val = (val & SX9310_SCAN_PERIOD_MASK) >> SX9310_SCAN_PERIOD_SHIFT;
> +
> + 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 = 0;
> + __be16 rawval;
> +
> + mutex_lock(&data->mutex);
> +
> + ret = sx9310_get_read_channel(data, chan->channel);
> + if (ret < 0)
> + goto out;
> +
> + ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ);
> + if (ret < 0)
> + goto out_put_channel;
> +
> + mutex_unlock(&data->mutex);
> +
> + if (data->client->irq > 0) {
> + ret = wait_for_completion_interruptible(&data->completion);
> + reinit_completion(&data->completion);
> + } else {
> + ret = sx9310_wait_for_sample(data);
> + }
> +
> + mutex_lock(&data->mutex);
> +
> + if (ret < 0)
> + goto out_disable_irq;
> +
> + ret = sx9310_read_prox_data(data, chan, &rawval);
> + if (ret < 0)
> + 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 < 0)
> + goto out_put_channel;
> +
> + ret = sx9310_put_read_channel(data, chan->channel);
> + if (ret < 0)
> + 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 = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, ®val);
> +
> + if (ret < 0)
> + return ret;
> +
> + regval = (regval & SX9310_SCAN_PERIOD_MASK) >> SX9310_SCAN_PERIOD_SHIFT;
> + *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_SCAN_PERIOD_MASK,
> + i << SX9310_SCAN_PERIOD_SHIFT);
> +
> + 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);
> +
> + /* Read proximity state on all channels */
> + ret = regmap_read(data->regmap, SX9310_REG_STAT0, &val);
> + if (ret < 0) {
> + dev_err(&data->client->dev, "i2c transfer error in irq\n");
> + return;
> + }
> +
> + for_each_set_bit(chan, &data->chan_event, SX9310_NUM_CHANNELS) {
> + int dir;
> + u64 ev;
> + bool new_prox = val & BIT(chan);
> +
> + 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, timestamp);
> + data->prox_stat[chan] = new_prox;
> + }
> +}
> +
> +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 < 0) {
> + dev_err(&data->client->dev, "i2c transfer error in irq\n");
> + goto out;
> + }
> +
> + if (val & SX9310_EVENT_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);
> + 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 < 0)
> + goto out_unlock;
> + if (!(data->chan_event & ~BIT(chan->channel))) {
> + ret = sx9310_enable_irq(data, SX9310_EVENT_IRQ);
> + if (ret < 0)
> + sx9310_put_event_channel(data, chan->channel);
> + }
> + } else {
> + ret = sx9310_put_event_channel(data, chan->channel);
> + if (ret < 0)
> + goto out_unlock;
> + if (!data->chan_event) {
> + ret = sx9310_disable_irq(data, SX9310_EVENT_IRQ);
> + if (ret < 0)
> + 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 < 0)
> + 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 < 0)
> + goto out;
> +
> + data->buffer[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,
> + .postenable = iio_triggered_buffer_postenable,
> + .predisable = iio_triggered_buffer_predisable,
> + .postdisable = sx9310_buffer_postdisable,
> +};
> +
> +struct sx9310_reg_default {
> + u8 reg;
> + u8 def;
> +};
> +
> +#define SX_INIT(_reg, _def) \
> + { \
> + .reg = SX9310_REG_##_reg, \
> + .def = _def, \
> + }
> +
> +static const struct sx9310_reg_default sx9310_default_regs[] = {
> + SX_INIT(IRQ_MSK, 0x00),
> + SX_INIT(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.
> + */
> + SX_INIT(PROX_CTRL0, SX9310_REG_PROX_CTRL0_PROXSTAT2),
> + SX_INIT(PROX_CTRL1, 0x00),
> + SX_INIT(PROX_CTRL2, SX9310_REG_PROX_CTRL2_COMBMODE_ALL |
> + SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC),
> + SX_INIT(PROX_CTRL3, SX9310_REG_PROX_CTRL3_GAIN0_X8 |
> + SX9310_REG_PROX_CTRL3_GAIN12_X4),
> + SX_INIT(PROX_CTRL4, SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST),
> + SX_INIT(PROX_CTRL5, SX9310_REG_PROX_CTRL5_RANGE_SMALL |
> + SX9310_REG_PROX_CTRL5_STARTUPSENS_CS1 |
> + SX9310_REG_PROX_CTRL5_RAWFILT_1P25),
> + SX_INIT(PROX_CTRL6, SX9310_REG_PROX_CTRL6_COMP_COMMON),
> + SX_INIT(PROX_CTRL7, SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 |
> + SX9310_REG_PROX_CTRL7_AVGPOSFILT_512),
> + SX_INIT(PROX_CTRL8, SX9310_REG_PROX_CTRL8_9_PTHRESH_96 |
> + SX9310_REG_PROX_CTRL8_9_BODYTHRESH_1500),
> + SX_INIT(PROX_CTRL9, SX9310_REG_PROX_CTRL8_9_PTHRESH12_28 |
> + SX9310_REG_PROX_CTRL8_9_BODYTHRESH_900),
> + SX_INIT(PROX_CTRL10, SX9310_REG_PROX_CTRL10_HYST_6PCT |
> + SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_8 |
> + SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_8),
> + SX_INIT(PROX_CTRL11, 0x00),
> + SX_INIT(PROX_CTRL12, 0x00),
> + SX_INIT(PROX_CTRL13, 0x00),
> + SX_INIT(PROX_CTRL14, 0x00),
> + SX_INIT(PROX_CTRL15, 0x00),
> + SX_INIT(PROX_CTRL16, 0x00),
> + SX_INIT(PROX_CTRL17, 0x00),
> + SX_INIT(PROX_CTRL18, 0x00),
> + SX_INIT(PROX_CTRL19, 0x00),
> + SX_INIT(SAR_CTRL0, SX9310_REG_SAR_CTRL0_SARDEB_4_SAMPLES |
> + SX9310_REG_SAR_CTRL0_SARHYST_8),
> + SX_INIT(SAR_CTRL1, SX9310_REG_SAR_CTRL1_SLOPE(10781250)),
> + SX_INIT(SAR_CTRL2, SX9310_REG_SAR_CTRL2_SAROFFSET_DEFAULT),
> +};
> +
> +#undef SX_INIT
> +
> +/* 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 i, ret;
> + unsigned int val;
> + unsigned int ctrl0;
> +
> + ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &ctrl0);
> + if (ret < 0)
> + return ret;
> +
> + /* run the compensation phase on all channels */
> + ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0,
> + ctrl0 | SX9310_REG_PROX_CTRL0_EN_MASK);
> + if (ret < 0)
> + return ret;
> +
> + for (i = 100; i >= 0; i--) {
> + msleep(20);
> + ret = regmap_read(data->regmap, SX9310_REG_STAT1, &val);
> + if (ret < 0)
> + goto out;
> + if (!(val & SX9310_COMPSTAT_MASK))
> + break;
> + }
> +
> + if (i < 0) {
> + dev_err(&data->client->dev,
> + "initial compensation timed out: 0x%02x", val);
> + ret = -ETIMEDOUT;
> + }
> +
> +out:
> + 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 < 0)
> + 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 < 0)
> + 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 < 0)
> + return ret;
> + }
> +
> + return sx9310_init_compensation(indio_dev);
> +}
> +
> +static int sx9310_set_indio_dev_name(struct device *dev,
> + struct iio_dev *indio_dev, int whoami)
> +{
> + if ((int)device_get_match_data(dev) != whoami)
> + dev_err(dev, "WHOAMI does not match device data: %s", whoami);
> +
> + 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", whoami);
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> +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;
> + 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 = regmap_read(data->regmap, SX9310_REG_WHOAMI, &data->whoami);
> + if (ret < 0) {
> + 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 < 0)
> + return ret;
> +
> + ACPI_COMPANION_SET(&indio_dev->dev, ACPI_COMPANION(dev));
> + indio_dev->dev.parent = 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 < 0)
> + return ret;
> +
> + if (client->irq) {
> + ret = devm_request_threaded_irq(dev, client->irq,
> + sx9310_irq_handler,
> + sx9310_irq_thread_handler,
> + IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> + "sx9310_event", indio_dev);
> + if (ret < 0)
> + 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 < 0)
> + 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_EN_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);
> +
> + enable_irq(data->client->irq);
> +
> + return ret;
> +}
> +
> +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" },
> + { .compatible = "semtech,sx9311" },
> + {}
> +};
> +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 = ACPI_PTR(sx9310_acpi_match),
> + .of_match_table = of_match_ptr(sx9310_of_match),
Seems you've missed one of Andy's comments here. Please take
a look at his review of v5.
> + .pm = &sx9310_pm_ops,
> + },
> + .probe_new = sx9310_probe,
> + .id_table = sx9310_id,
> +};
> +module_i2c_driver(sx9310_driver);
> +
> +MODULE_AUTHOR("Gwendal Grignou <gwendal@...omium.org>");
> +MODULE_AUTHOR("Daniel Campello <campello@...omium.org>");
> +MODULE_DESCRIPTION("Driver for Semtech SX9310/SX9311 proximity sensor");
> +MODULE_LICENSE("GPL v2");
> --
> 2.26.0.292.g33ef6b2f38-goog
>
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