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Message-Id: <20181101214313.157556-1-egranata@google.com>
Date: Thu, 1 Nov 2018 14:43:13 -0700
From: Enrico Granata <egranata@...gle.com>
To: Jonathan Cameron <jic23@...nel.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Enrico Granata <egranata@...omium.org>, gwendal@...omium.org,
patplunkett@...gle.com,
Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] iio: sx932x: Add driver for Semtech sx932x proximity sensor
From: Enrico Granata <egranata@...omium.org>
This driver allows interfacing with the Semtech sx9320, sx9321 and sx9324
proximity sensors via the IIO subsystem.
Signed-off-by: Enrico Granata <egranata@...omium.org>
---
.../bindings/iio/proximity/sx932x.txt | 54 +
drivers/iio/proximity/Kconfig | 36 +-
drivers/iio/proximity/Makefile | 1 +
drivers/iio/proximity/sx932x.c | 1462 +++++++++++++++++
4 files changed, 1542 insertions(+), 11 deletions(-)
create mode 100644 Documentation/devicetree/bindings/iio/proximity/sx932x.txt
create mode 100644 drivers/iio/proximity/sx932x.c
diff --git a/Documentation/devicetree/bindings/iio/proximity/sx932x.txt b/Documentation/devicetree/bindings/iio/proximity/sx932x.txt
new file mode 100644
index 0000000000000..e1f1fefdbca08
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/proximity/sx932x.txt
@@ -0,0 +1,54 @@
+Semtech's SX9320/SX9321/SX9324 capacitive proximity button device driver
+
+Required properties:
+ - compatible: must be "semtech,sx9320 or sx9321 or sx9324"
+ - reg: i2c address where to find the device
+ - interrupt-parent : should be the phandle for the interrupt controller
+ - interrupts : the sole interrupt generated by the device
+ - semtech,register-prefix: the string prefixing all register names in the
+
+ Refer to interrupt-controller/interrupts.txt for generic
+ interrupt client node bindings.
+
+Optional properties:
+ - semtech,adv_ctrl10: Initial value for register AdvCtrl10.
+ - semtech,afe_ctrl4: Initial value for register AfeCtrl4.
+ - semtech,afe_ctrl7: Initial value for register AfeCtrl7.
+ - semtech,afe_ctrl9: Initial value for register AfeCtrl9.
+ - semtech,prox_ctrl0: Initial value for register ProxCtrl0.
+ - semtech,prox_ctrl1: Initial value for register ProxCtrl1.
+ - semtech,prox_ctrl2: Initial value for register ProxCtrl2.
+ - semtech,prox_ctrl4: Initial value for register ProxCtrl4.
+ - semtech,prox_ctrl5: Initial value for register ProxCtrl5.
+ - semtech,prox_ctrl6: Initial value for register ProxCtrl6.
+ - semtech,prox_ctrl7: Initial value for register Prox_Trl7.
+ - semtech,adv_ctrl16: Initial value for register AdvCtrl16.
+ - semtech,adv_ctrl17: Initial value for register AdvCtrl17.
+ - semtech,adv_ctrl18: Initial value for register AdvCtrl18.
+ - semtech,gnrl_ctrl1: Initial value for register GnrlCtrl1.
+
+ Refer to the data sheet for register definitions.
+
+Example:
+
+sx9310@28 {
+ compatible = "semtech,sx9320";
+ reg = <0x28>;
+ interrupt-parent = <&gpio2>;
+ interrupts = <16 IRQ_TYPE_LEVEL_LOW>;
+};
+
+Driver supports ACPI bindings. We can store registers configuration obtained
+from per-model SAR sensor calibration. Refer to the data sheet for meaning.
+
+ACPI name is STH9320 or STH9321 or STH9324.
+
+Example:
+ chip drivers/i2c/generic
+ register "hid" = ""STH9321""
+ register "name" = ""SEMTECH SX9321""
+ register "desc" = ""SAR Proximity Sensor""
+ register "irq" = "ACPI_IRQ_LEVEL_LOW(GPP_A18_IRQ)"
+ register "device_present_gpio" = "GPP_B20"
+ device i2c 28 on end
+ end
diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig
index b99367a89f810..3b979b8198d7c 100644
--- a/drivers/iio/proximity/Kconfig
+++ b/drivers/iio/proximity/Kconfig
@@ -66,31 +66,45 @@ config SRF04
To compile this driver as a module, choose M here: the
module will be called srf04.
-config SX9500
- tristate "SX9500 Semtech proximity sensor"
+config SRF08
+ tristate "Devantech SRF02/SRF08/SRF10 ultrasonic ranger sensor"
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ depends on I2C
+ help
+ Say Y here to build a driver for Devantech SRF02/SRF08/SRF10
+ ultrasonic ranger sensors with i2c interface.
+ This driver can be used to measure the distance of objects.
+
+ To compile this driver as a module, choose M here: the
+ module will be called srf08.
+
+config SX932X
+ tristate "sx932x Semtech proximity sensor"
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
select REGMAP_I2C
depends on I2C
help
- Say Y here to build a driver for Semtech's SX9500 capacitive
- proximity/button sensor.
+ Say Y here to build a driver for Semtech's sx932x capacitive
+ proximity/button sensor. This driver supports Semtech's
+ sx9320, sx9321 and sx9324 sensors.
To compile this driver as a module, choose M here: the
- module will be called sx9500.
+ module will be called sx932x.
-config SRF08
- tristate "Devantech SRF02/SRF08/SRF10 ultrasonic ranger sensor"
+config SX9500
+ tristate "SX9500 Semtech proximity sensor"
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
+ select REGMAP_I2C
depends on I2C
help
- Say Y here to build a driver for Devantech SRF02/SRF08/SRF10
- ultrasonic ranger sensors with i2c interface.
- This driver can be used to measure the distance of objects.
+ Say Y here to build a driver for Semtech's SX9500 capacitive
+ proximity/button sensor.
To compile this driver as a module, choose M here: the
- module will be called srf08.
+ module will be called sx9500.
config VL53L0X_I2C
tristate "STMicroelectronics VL53L0X ToF ranger sensor (I2C)"
diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile
index 6d031f903c4c2..65ac237d63dd6 100644
--- a/drivers/iio/proximity/Makefile
+++ b/drivers/iio/proximity/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_LIDAR_LITE_V2) += pulsedlight-lidar-lite-v2.o
obj-$(CONFIG_RFD77402) += rfd77402.o
obj-$(CONFIG_SRF04) += srf04.o
obj-$(CONFIG_SRF08) += srf08.o
+obj-$(CONFIG_SX932X) += sx932x.o
obj-$(CONFIG_SX9500) += sx9500.o
obj-$(CONFIG_VL53L0X_I2C) += vl53l0x-i2c.o
diff --git a/drivers/iio/proximity/sx932x.c b/drivers/iio/proximity/sx932x.c
new file mode 100644
index 0000000000000..069d3678f6bc9
--- /dev/null
+++ b/drivers/iio/proximity/sx932x.c
@@ -0,0 +1,1462 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2018 Google LLC.
+ *
+ * Driver for Semtech's SX9320 capacitive proximity/button solution.
+ * Datasheet available at
+ * <http://www.semtech.com/images/datasheet/sx9320.pdf>.
+ * Based on SX9500 driver and Semtech driver using the input framework
+ * <https://my.syncplicity.com/share/teouwsim8niiaud/
+ * linux-driver-SX9320_NoSmartHSensing>.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
+#include <linux/regmap.h>
+#include <linux/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 SX932X_DRIVER_NAME "sx932x"
+#define SX9320_ACPI_NAME "STH9320"
+#define SX9321_ACPI_NAME "STH9321"
+#define SX9324_ACPI_NAME "STH9324"
+#define SX932X_DEV_NB 2
+
+#define SX932X_IRQ_NAME "sx932x_event"
+
+#define SX932X_GPIO_INT "interrupt"
+
+/* Register definitions. */
+#define SX932X_REG_IRQ_SRC 0x00
+#define SX932X_REG_STAT0 0x01
+#define SX932X_REG_STAT1 0x02
+#define SX932X_REG_STAT2 0x03
+#define SX932X_REG_STAT3 0x04
+#define SX932X_REG_IRQ_MSK 0x05
+#define SX932X_REG_IRQ_CFG0 0x06
+#define SX932X_REG_IRQ_CFG2 0x07
+
+#define SX932X_REG_GNRL_CTRL0 0x10
+#define SX932X_REG_GNRL_CTRL1 0x11
+
+#define SX932X_REG_I2C_ADDR 0x14
+#define SX932X_REG_CLK_SPRD 0x15
+
+#define SX932X_REG_AFE_CTRL0 0x20
+#define SX932X_REG_AFE_CTRL1 0x21
+#define SX932X_REG_AFE_CTRL2 0x22
+#define SX932X_REG_AFE_CTRL3 0x23
+#define SX932X_REG_AFE_CTRL4 0x24
+#define SX932X_REG_AFE_CTRL5 0x25
+#define SX932X_REG_AFE_CTRL6 0x26
+#define SX932X_REG_AFE_CTRL7 0x27
+#define SX932X_REG_AFE_PH0 0x28
+#define SX932X_REG_AFE_PH1 0x29
+#define SX932X_REG_AFE_PH2 0x2a
+#define SX932X_REG_AFE_PH3 0x2b
+#define SX932X_REG_AFE_CTRL8 0x2c
+#define SX932X_REG_AFE_CTRL9 0x2d
+
+#define SX932X_REG_PROX_CTRL0 0x30
+#define SX932X_REG_PROX_CTRL1 0x31
+#define SX932X_REG_PROX_CTRL2 0x32
+#define SX932X_REG_PROX_CTRL3 0x33
+#define SX932X_REG_PROX_CTRL4 0x34
+#define SX932X_REG_PROX_CTRL5 0x35
+#define SX932X_REG_PROX_CTRL6 0x36
+#define SX932X_REG_PROX_CTRL7 0x37
+
+#define SX932X_REG_ADV_CTRL0 0x40
+#define SX932X_REG_ADV_CTRL1 0x41
+#define SX932X_REG_ADV_CTRL2 0x42
+#define SX932X_REG_ADV_CTRL3 0x43
+#define SX932X_REG_ADV_CTRL4 0x44
+#define SX932X_REG_ADV_CTRL5 0x45
+#define SX932X_REG_ADV_CTRL6 0x46
+#define SX932X_REG_ADV_CTRL7 0x47
+#define SX932X_REG_ADV_CTRL8 0x48
+#define SX932X_REG_ADV_CTRL9 0x49
+#define SX932X_REG_ADV_CTRL10 0x4a
+#define SX932X_REG_ADV_CTRL11 0x4b
+#define SX932X_REG_ADV_CTRL12 0x4c
+#define SX932X_REG_ADV_CTRL13 0x4d
+#define SX932X_REG_ADV_CTRL14 0x4e
+#define SX932X_REG_ADV_CTRL15 0x4f
+#define SX932X_REG_ADV_CTRL16 0x50
+#define SX932X_REG_ADV_CTRL17 0x51
+#define SX932X_REG_ADV_CTRL18 0x52
+#define SX932X_REG_ADV_CTRL19 0x53
+#define SX932X_REG_ADV_CTRL20 0x54
+
+#define SX932X_REG_PHASE_SEL 0x60
+
+#define SX932X_REG_USE_MSB 0x61
+#define SX932X_REG_USE_LSB 0x62
+
+#define SX932X_REG_AVG_MSB 0x63
+#define SX932X_REG_AVG_LSB 0x64
+
+#define SX932X_REG_DIFF_MSB 0x65
+#define SX932X_REG_DIFF_LSB 0x66
+
+#define SX932X_REG_OFFSET_MSB 0x67
+#define SX932X_REG_OFFSET_LSB 0x68
+
+#define SX932X_REG_SAR_MSB 0x69
+#define SX932X_REG_SAR_LSB 0x6a
+
+#define SX932X_REG_RESET 0x9f
+/* Write this to REG_RESET to do a soft reset. */
+#define SX932X_SOFT_RESET 0xde
+
+#define SX932X_REG_WHOAMI 0xfa
+#define SX9320_WHOAMI 0x20
+#define SX9321_WHOAMI 0x21
+#define SX9324_WHOAMI 0x23
+#define SX932X_REG_REVISION 0xfe
+
+
+/* Sensor Readback */
+
+/*
+ * These serve for identifying IRQ source in the IRQ_SRC register, and
+ * also for masking the IRQs in the IRQ_MSK register.
+ */
+#define SX932X_RESET_IRQ BIT(7)
+#define SX932X_CLOSE_IRQ BIT(6)
+#define SX932X_FAR_IRQ BIT(5)
+#define SX932X_COMPDONE_IRQ BIT(4)
+#define SX932X_CONVDONE_IRQ BIT(3)
+
+#define SX932X_SCAN_PERIOD_MASK GENMASK(7, 4)
+#define SX932X_SCAN_PERIOD_SHIFT 4
+
+#define SX932X_COMPSTAT_MASK GENMASK(3, 0)
+
+/* 4 channels, as defined in STAT0: PH0, PH1, PH2 and PH3. */
+#define SX932X_NUM_CHANNELS 4
+#define SX932X_CHAN_MASK GENMASK(1, 0)
+
+struct sx932x_reg_config {
+ const char *property;
+ u8 reg_addr;
+ u8 def_value;
+};
+
+struct sx932x_data {
+ struct mutex mutex;
+ struct i2c_client *client;
+ const struct sx932x_reg_config *reg_config;
+ 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[SX932X_NUM_CHANNELS];
+ bool event_enabled[SX932X_NUM_CHANNELS];
+ bool trigger_enabled;
+ u16 *buffer;
+ /* Remember which phases are enabled during a suspend. */
+ unsigned int suspend_reg_gnrl_ctrl1;
+ struct completion completion;
+ int data_rdy_users, close_far_users;
+ int channel_users[SX932X_NUM_CHANNELS];
+};
+
+static const struct iio_event_spec sx932x_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE),
+ },
+};
+
+#define SX932X_RAW_CHANNEL(idx, name, addr) \
+ { \
+ .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, \
+ .address = addr, \
+ .event_spec = sx932x_events, \
+ .num_event_specs = ARRAY_SIZE(sx932x_events), \
+ .extend_name = name, \
+ .scan_index = idx, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 16, \
+ .storagebits = 16, \
+ .shift = 0, \
+ }, \
+ }
+
+#define SX932X_PROCESSED_CHANNEL(idx, name, addr) \
+ { \
+ .type = IIO_PROXIMITY, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+ .indexed = 1, \
+ .channel = idx, \
+ .address = addr, \
+ .event_spec = sx932x_events, \
+ .num_event_specs = ARRAY_SIZE(sx932x_events), \
+ .extend_name = name, \
+ .scan_index = idx, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 16, \
+ .storagebits = 16, \
+ .shift = 0, \
+ }, \
+ }
+
+static const struct iio_chan_spec sx932x_channels[] = {
+ SX932X_RAW_CHANNEL(0, "UC0", SX932X_REG_USE_MSB),
+ SX932X_RAW_CHANNEL(1, "UC1", SX932X_REG_USE_MSB),
+ SX932X_RAW_CHANNEL(2, "UC2", SX932X_REG_USE_MSB),
+ SX932X_RAW_CHANNEL(3, "UC3", SX932X_REG_USE_MSB),
+
+ SX932X_RAW_CHANNEL(4, "AC0", SX932X_REG_AVG_MSB),
+ SX932X_RAW_CHANNEL(5, "AC1", SX932X_REG_AVG_MSB),
+ SX932X_RAW_CHANNEL(6, "AC2", SX932X_REG_AVG_MSB),
+ SX932X_RAW_CHANNEL(7, "AC3", SX932X_REG_AVG_MSB),
+
+ SX932X_RAW_CHANNEL(8, "DC0", SX932X_REG_DIFF_MSB),
+ SX932X_RAW_CHANNEL(9, "DC1", SX932X_REG_DIFF_MSB),
+ SX932X_RAW_CHANNEL(10, "DC2", SX932X_REG_DIFF_MSB),
+ SX932X_RAW_CHANNEL(11, "DC3", SX932X_REG_DIFF_MSB),
+
+ SX932X_RAW_CHANNEL(12, "CO0", SX932X_REG_OFFSET_MSB),
+ SX932X_RAW_CHANNEL(13, "CO1", SX932X_REG_OFFSET_MSB),
+ SX932X_RAW_CHANNEL(14, "CO2", SX932X_REG_OFFSET_MSB),
+ SX932X_RAW_CHANNEL(15, "CO3", SX932X_REG_OFFSET_MSB),
+
+ IIO_CHAN_SOFT_TIMESTAMP(16),
+};
+
+static const struct {
+ int val;
+ int val2;
+} sx932x_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 */
+ {8, 333333}, /* 1101: 3 s */
+ {0, 250000}, /* 1110: 4 s */
+ {0, 200000}, /* 1111: 5 s */
+};
+static const unsigned int sx932x_scan_period_table[] = {
+ 2, 15, 30, 45, 60, 90, 120, 200, 400, 800, 1000, 2000, 3000, 4000, 5000,
+};
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
+ "500.0 66.666666 33.333333 22.222222 16.666666 "
+ "11.111111 8.333333 5.0 2.500000 1.666666 1.250000 "
+ "1.0 0.500000 8.333333 0.250000 0.200000");
+
+
+static const struct regmap_range sx932x_writable_reg_ranges[] = {
+ regmap_reg_range(SX932X_REG_IRQ_MSK, SX932X_REG_IRQ_CFG2),
+ regmap_reg_range(SX932X_REG_GNRL_CTRL0, SX932X_REG_GNRL_CTRL1),
+ /* Leave i2c and clock spreading as unavailable */
+ regmap_reg_range(SX932X_REG_AFE_CTRL0, SX932X_REG_AFE_CTRL9),
+ regmap_reg_range(SX932X_REG_PROX_CTRL0, SX932X_REG_PROX_CTRL7),
+ regmap_reg_range(SX932X_REG_ADV_CTRL0, SX932X_REG_ADV_CTRL20),
+ regmap_reg_range(SX932X_REG_PHASE_SEL, SX932X_REG_PHASE_SEL),
+ regmap_reg_range(SX932X_REG_OFFSET_MSB, SX932X_REG_OFFSET_LSB),
+ regmap_reg_range(SX932X_REG_RESET, SX932X_REG_RESET),
+};
+
+static const struct regmap_access_table sx932x_writeable_regs = {
+ .yes_ranges = sx932x_writable_reg_ranges,
+ .n_yes_ranges = ARRAY_SIZE(sx932x_writable_reg_ranges),
+};
+
+/*
+ * All allocated registers are readable, so we just list unallocated
+ * ones.
+ */
+static const struct regmap_range sx932x_non_readable_reg_ranges[] = {
+ regmap_reg_range(SX932X_REG_IRQ_CFG2 + 1, SX932X_REG_GNRL_CTRL0 - 1),
+ regmap_reg_range(SX932X_REG_GNRL_CTRL1 + 1, SX932X_REG_AFE_CTRL0 - 1),
+ regmap_reg_range(SX932X_REG_AFE_CTRL9 + 1, SX932X_REG_PROX_CTRL0 - 1),
+ regmap_reg_range(SX932X_REG_PROX_CTRL7 + 1, SX932X_REG_ADV_CTRL0 - 1),
+ regmap_reg_range(SX932X_REG_ADV_CTRL20 + 1, SX932X_REG_PHASE_SEL - 1),
+ regmap_reg_range(SX932X_REG_SAR_LSB + 1, SX932X_REG_RESET - 1),
+ regmap_reg_range(SX932X_REG_RESET + 1, SX932X_REG_WHOAMI - 1),
+ regmap_reg_range(SX932X_REG_WHOAMI + 1, SX932X_REG_REVISION - 1),
+};
+
+static const struct regmap_access_table sx932x_readable_regs = {
+ .no_ranges = sx932x_non_readable_reg_ranges,
+ .n_no_ranges = ARRAY_SIZE(sx932x_non_readable_reg_ranges),
+};
+
+static const struct regmap_range sx932x_volatile_reg_ranges[] = {
+ regmap_reg_range(SX932X_REG_IRQ_SRC, SX932X_REG_STAT3),
+ regmap_reg_range(SX932X_REG_USE_MSB, SX932X_REG_DIFF_LSB),
+ regmap_reg_range(SX932X_REG_SAR_MSB, SX932X_REG_SAR_LSB),
+ regmap_reg_range(SX932X_REG_WHOAMI, SX932X_REG_WHOAMI),
+ regmap_reg_range(SX932X_REG_REVISION, SX932X_REG_REVISION),
+};
+
+static const struct regmap_access_table sx932x_volatile_regs = {
+ .yes_ranges = sx932x_volatile_reg_ranges,
+ .n_yes_ranges = ARRAY_SIZE(sx932x_volatile_reg_ranges),
+};
+
+static const struct regmap_config sx932x_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .max_register = SX932X_REG_REVISION,
+ .cache_type = REGCACHE_RBTREE,
+
+ .wr_table = &sx932x_writeable_regs,
+ .rd_table = &sx932x_readable_regs,
+ .volatile_table = &sx932x_volatile_regs,
+};
+
+static int sx932x_inc_users(struct sx932x_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 sx932x_dec_users(struct sx932x_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 sx932x_inc_chan_users(struct sx932x_data *data, int chan)
+{
+ return sx932x_inc_users(data, &data->channel_users[chan],
+ SX932X_REG_PROX_CTRL0, BIT(chan));
+}
+
+static int sx932x_dec_chan_users(struct sx932x_data *data, int chan)
+{
+ return sx932x_dec_users(data, &data->channel_users[chan],
+ SX932X_REG_PROX_CTRL0, BIT(chan));
+}
+
+static int sx932x_inc_data_rdy_users(struct sx932x_data *data)
+{
+ return sx932x_inc_users(data, &data->data_rdy_users,
+ SX932X_REG_IRQ_MSK, SX932X_CONVDONE_IRQ);
+}
+
+static int sx932x_dec_data_rdy_users(struct sx932x_data *data)
+{
+ return sx932x_dec_users(data, &data->data_rdy_users,
+ SX932X_REG_IRQ_MSK, SX932X_CONVDONE_IRQ);
+}
+
+static int sx932x_inc_close_far_users(struct sx932x_data *data)
+{
+ return sx932x_inc_users(data, &data->close_far_users,
+ SX932X_REG_IRQ_MSK,
+ SX932X_CLOSE_IRQ | SX932X_FAR_IRQ);
+}
+
+static int sx932x_dec_close_far_users(struct sx932x_data *data)
+{
+ return sx932x_dec_users(data, &data->close_far_users,
+ SX932X_REG_IRQ_MSK,
+ SX932X_CLOSE_IRQ | SX932X_FAR_IRQ);
+}
+
+static int sx932x_read_prox_data(struct sx932x_data *data,
+ const struct iio_chan_spec *chan,
+ int *val)
+{
+ int ret;
+ __be16 regval;
+ const int regid = chan->channel & 3;
+
+ ret = regmap_write(data->regmap, SX932X_REG_PHASE_SEL, regid);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_bulk_read(data->regmap, chan->address, ®val, 2);
+ if (ret < 0)
+ return ret;
+
+ *val = sign_extend32(be16_to_cpu(regval), 15);
+
+ return 0;
+}
+
+static int sx932x_read_stat_data(struct sx932x_data *data,
+ const struct iio_chan_spec
+ *chan,
+ int *val)
+{
+ int ret;
+
+ ret = regmap_read(data->regmap, chan->address, val);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+/*
+ * If we have no interrupt support, we have to wait for a scan period
+ * after enabling a channel to get a result.
+ */
+static int sx932x_wait_for_sample(struct sx932x_data *data)
+{
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(data->regmap, SX932X_REG_PROX_CTRL0, &val);
+ if (ret < 0)
+ return ret;
+
+ val = (val & SX932X_SCAN_PERIOD_MASK) >> SX932X_SCAN_PERIOD_SHIFT;
+
+ msleep(sx932x_scan_period_table[val]);
+
+ return 0;
+}
+
+static int sx932x_read_stat(struct sx932x_data *data,
+ const struct iio_chan_spec *chan,
+ int *val)
+{
+ int ret;
+
+ mutex_lock(&data->mutex);
+
+ ret = sx932x_inc_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out;
+
+ ret = sx932x_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 = sx932x_wait_for_sample(data);
+
+ mutex_lock(&data->mutex);
+
+ if (ret < 0)
+ goto out_dec_data_rdy;
+
+ ret = sx932x_read_stat_data(data, chan, val);
+ if (ret < 0)
+ goto out_dec_data_rdy;
+
+ ret = sx932x_dec_data_rdy_users(data);
+ if (ret < 0)
+ goto out_dec_chan;
+
+ ret = sx932x_dec_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out;
+
+ ret = IIO_VAL_INT;
+
+ goto out;
+
+out_dec_data_rdy:
+ sx932x_dec_data_rdy_users(data);
+out_dec_chan:
+ sx932x_dec_chan_users(data, chan->channel);
+out:
+ mutex_unlock(&data->mutex);
+ reinit_completion(&data->completion);
+
+ return ret;
+}
+
+static int sx932x_read_proximity(struct sx932x_data *data,
+ const struct iio_chan_spec *chan,
+ int *val)
+{
+ int ret;
+
+ mutex_lock(&data->mutex);
+
+ ret = sx932x_inc_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out;
+
+ ret = sx932x_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 = sx932x_wait_for_sample(data);
+
+ mutex_lock(&data->mutex);
+
+ if (ret < 0)
+ goto out_dec_data_rdy;
+
+ ret = sx932x_read_prox_data(data, chan, val);
+ if (ret < 0)
+ goto out_dec_data_rdy;
+
+ ret = sx932x_dec_data_rdy_users(data);
+ if (ret < 0)
+ goto out_dec_chan;
+
+ ret = sx932x_dec_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out;
+
+ ret = IIO_VAL_INT;
+
+ goto out;
+
+out_dec_data_rdy:
+ sx932x_dec_data_rdy_users(data);
+out_dec_chan:
+ sx932x_dec_chan_users(data, chan->channel);
+out:
+ mutex_unlock(&data->mutex);
+ reinit_completion(&data->completion);
+
+ return ret;
+}
+
+static int sx932x_read_samp_freq(struct sx932x_data *data,
+ int *val, int *val2)
+{
+ int ret;
+ unsigned int regval;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_read(data->regmap, SX932X_REG_PROX_CTRL0, ®val);
+ mutex_unlock(&data->mutex);
+
+ if (ret < 0)
+ return ret;
+
+ regval = (regval & SX932X_SCAN_PERIOD_MASK) >> SX932X_SCAN_PERIOD_SHIFT;
+ *val = sx932x_samp_freq_table[regval].val;
+ *val2 = sx932x_samp_freq_table[regval].val2;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int sx932x_read_raw(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ int *val, int *val2, long mask)
+{
+ struct sx932x_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&indio_dev->mlock);
+
+ if (iio_buffer_enabled(indio_dev)) {
+ mutex_unlock(&indio_dev->mlock);
+ return -EBUSY;
+ }
+ ret = sx932x_read_proximity(data, chan, val);
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+ case IIO_CHAN_INFO_PROCESSED:
+ mutex_lock(&indio_dev->mlock);
+
+ if (iio_buffer_enabled(indio_dev)) {
+ mutex_unlock(&indio_dev->mlock);
+ return -EBUSY;
+ }
+ ret = sx932x_read_stat(data, chan, val);
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return sx932x_read_samp_freq(data, val, val2);
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static int sx932x_set_samp_freq(struct sx932x_data *data,
+ int val, int val2)
+{
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(sx932x_samp_freq_table); i++)
+ if (val == sx932x_samp_freq_table[i].val &&
+ val2 == sx932x_samp_freq_table[i].val2)
+ break;
+
+ if (i == ARRAY_SIZE(sx932x_samp_freq_table))
+ return -EINVAL;
+
+ mutex_lock(&data->mutex);
+
+ ret = regmap_update_bits(data->regmap, SX932X_REG_PROX_CTRL0,
+ SX932X_SCAN_PERIOD_MASK,
+ i << SX932X_SCAN_PERIOD_SHIFT);
+
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int sx932x_write_raw(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ int val, int val2, long mask)
+{
+ struct sx932x_data *data = iio_priv(indio_dev);
+
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return sx932x_set_samp_freq(data, val, val2);
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static irqreturn_t sx932x_irq_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct sx932x_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 SX932X_REG_IRQ_SRC. It
+ * is not possible to do that here because regmap_read takes a
+ * mutex.
+ */
+ return IRQ_WAKE_THREAD;
+}
+
+static void sx932x_push_events(struct iio_dev *indio_dev)
+{
+ int ret;
+ unsigned int val, chan;
+ struct sx932x_data *data = iio_priv(indio_dev);
+
+ ret = regmap_read(data->regmap, SX932X_REG_STAT0, &val);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "i2c transfer error in irq\n");
+ return;
+ }
+
+ for (chan = 0; chan < SX932X_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 sx932x_irq_thread_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct sx932x_data *data = iio_priv(indio_dev);
+ int ret;
+ unsigned int val;
+
+ mutex_lock(&data->mutex);
+
+ ret = regmap_read(data->regmap, SX932X_REG_IRQ_SRC, &val);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "i2c transfer error in irq\n");
+ goto out;
+ }
+
+ if (val & (SX932X_CLOSE_IRQ | SX932X_FAR_IRQ))
+ sx932x_push_events(indio_dev);
+
+ if (val & SX932X_CONVDONE_IRQ)
+ complete(&data->completion);
+
+out:
+ mutex_unlock(&data->mutex);
+
+ return IRQ_HANDLED;
+}
+
+static int sx932x_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 sx932x_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 & SX932X_CHAN_MASK];
+}
+
+static int sx932x_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 sx932x_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 = sx932x_inc_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out_unlock;
+ ret = sx932x_inc_close_far_users(data);
+ if (ret < 0)
+ goto out_undo_chan;
+ } else {
+ ret = sx932x_dec_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out_unlock;
+ ret = sx932x_dec_close_far_users(data);
+ if (ret < 0)
+ goto out_undo_chan;
+ }
+
+ data->event_enabled[chan->channel & SX932X_CHAN_MASK] = state;
+ goto out_unlock;
+
+out_undo_chan:
+ if (state == 1)
+ sx932x_dec_chan_users(data, chan->channel);
+ else
+ sx932x_inc_chan_users(data, chan->channel);
+out_unlock:
+ mutex_unlock(&data->mutex);
+ return ret;
+}
+
+static int sx932x_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *scan_mask)
+{
+ struct sx932x_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 ssize_t sx932x_uid_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+#ifdef CONFIG_ACPI
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+
+ if (adev != NULL)
+ return scnprintf(buf, PAGE_SIZE, "%s\n", acpi_device_uid(adev));
+#endif
+ return scnprintf(buf, PAGE_SIZE, "%d\n", indio_dev->id);
+}
+
+static IIO_DEVICE_ATTR(uid, 0444, sx932x_uid_show, NULL, 0);
+
+struct sx932x_ctrl_attribute {
+ struct device_attribute dev_attr;
+ u8 ctrl;
+};
+
+static inline struct sx932x_ctrl_attribute *sx932x_to_ctrl_attr(
+ struct device_attribute *attr)
+{
+ return container_of(attr, struct sx932x_ctrl_attribute, dev_attr);
+}
+
+static ssize_t sx932x_show_ctrl_attr(struct device *dev,
+ struct device_attribute *dev_attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct sx932x_ctrl_attribute *attr = sx932x_to_ctrl_attr(dev_attr);
+ struct sx932x_data *data = iio_priv(indio_dev);
+ unsigned int val;
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_read(data->regmap, attr->ctrl, &val);
+ mutex_unlock(&data->mutex);
+ if (ret)
+ return ret;
+
+ return scnprintf(buf, PAGE_SIZE, "%02x\n", val);
+}
+
+static ssize_t sx932x_store_ctrl_attr(struct device *dev,
+ struct device_attribute *dev_attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct sx932x_ctrl_attribute *attr = sx932x_to_ctrl_attr(dev_attr);
+ struct sx932x_data *data = iio_priv(indio_dev);
+ u8 val;
+ int ret;
+
+ if (kstrtou8(buf, 0, &val))
+ return -EINVAL;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_write(data->regmap, attr->ctrl, val);
+ mutex_unlock(&data->mutex);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+#define SX932X_CTRL_ATTR_FILL(_name, _mode, _show, _store, _ctrl, _offset) \
+ { .dev_attr = __ATTR(_name, _mode, _show, _store), \
+ .ctrl = _ctrl + _offset }
+
+#define SX932X_CTRL_ATTR(_name, _mode, _show, _store, _ctrl, _offset) \
+ struct sx932x_ctrl_attribute sx932x_ctrl_attr_##_name = \
+ SX932X_CTRL_ATTR_FILL( \
+ _name, _mode, _show, _store, _ctrl, _offset)
+
+#define SX932X_ADV_CTRL_RW(_ctrl) \
+ SX932X_CTRL_ATTR(adv_ctrl##_ctrl##_raw, 0644, \
+ sx932x_show_ctrl_attr, sx932x_store_ctrl_attr, \
+ _ctrl, SX932X_REG_ADV_CTRL0)
+
+static SX932X_ADV_CTRL_RW(0);
+static SX932X_ADV_CTRL_RW(1);
+static SX932X_ADV_CTRL_RW(2);
+static SX932X_ADV_CTRL_RW(3);
+static SX932X_ADV_CTRL_RW(4);
+static SX932X_ADV_CTRL_RW(5);
+static SX932X_ADV_CTRL_RW(6);
+static SX932X_ADV_CTRL_RW(7);
+static SX932X_ADV_CTRL_RW(8);
+static SX932X_ADV_CTRL_RW(9);
+static SX932X_ADV_CTRL_RW(10);
+static SX932X_ADV_CTRL_RW(11);
+static SX932X_ADV_CTRL_RW(12);
+static SX932X_ADV_CTRL_RW(13);
+static SX932X_ADV_CTRL_RW(14);
+static SX932X_ADV_CTRL_RW(15);
+static SX932X_ADV_CTRL_RW(16);
+static SX932X_ADV_CTRL_RW(17);
+static SX932X_ADV_CTRL_RW(18);
+static SX932X_ADV_CTRL_RW(19);
+static SX932X_ADV_CTRL_RW(20);
+
+static struct attribute *sx932x_attributes[] = {
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ &iio_dev_attr_uid.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl0_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl1_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl2_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl3_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl4_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl5_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl6_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl7_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl8_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl9_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl10_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl11_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl12_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl13_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl14_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl15_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl16_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl17_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl18_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl19_raw.dev_attr.attr,
+ &sx932x_ctrl_attr_adv_ctrl20_raw.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group sx932x_attribute_group = {
+ .attrs = sx932x_attributes,
+};
+
+static const struct iio_info sx932x_info = {
+ .attrs = &sx932x_attribute_group,
+ .read_raw = &sx932x_read_raw,
+ .write_raw = &sx932x_write_raw,
+ .read_event_config = &sx932x_read_event_config,
+ .write_event_config = &sx932x_write_event_config,
+ .update_scan_mode = &sx932x_update_scan_mode,
+};
+
+static int sx932x_set_trigger_state(struct iio_trigger *trig,
+ bool state)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct sx932x_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+
+ if (state)
+ ret = sx932x_inc_data_rdy_users(data);
+ else
+ ret = sx932x_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 sx932x_trigger_ops = {
+ .set_trigger_state = sx932x_set_trigger_state,
+};
+
+static irqreturn_t sx932x_trigger_handler(int irq, void *private)
+{
+ struct iio_poll_func *pf = private;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct sx932x_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 = sx932x_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 sx932x_buffer_preenable(struct iio_dev *indio_dev)
+{
+ struct sx932x_data *data = iio_priv(indio_dev);
+ int ret = 0, i;
+
+ mutex_lock(&data->mutex);
+
+ for (i = 0; i < SX932X_NUM_CHANNELS; i++)
+ if (test_bit(i, indio_dev->active_scan_mask)) {
+ ret = sx932x_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))
+ sx932x_dec_chan_users(data, i);
+
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int sx932x_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct sx932x_data *data = iio_priv(indio_dev);
+ int ret = 0, i;
+
+ iio_triggered_buffer_predisable(indio_dev);
+
+ mutex_lock(&data->mutex);
+
+ for (i = 0; i < SX932X_NUM_CHANNELS; i++)
+ if (test_bit(i, indio_dev->active_scan_mask)) {
+ ret = sx932x_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))
+ sx932x_inc_chan_users(data, i);
+
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static const struct iio_buffer_setup_ops sx932x_buffer_setup_ops = {
+ .preenable = sx932x_buffer_preenable,
+ .postenable = iio_triggered_buffer_postenable,
+ .predisable = sx932x_buffer_predisable,
+};
+#define SX932X_REG_CONFIG(_property_prefix, _property_name, _reg_addr, \
+ _def_value) \
+ { \
+ .property = _property_prefix ",reg_" _property_name, \
+ .reg_addr = SX932X_REG_##_reg_addr, .def_value = _def_value, \
+ }
+
+#define SX932X_DEFAULT_REG_CONFIGS(_property_prefix) \
+ { \
+ { \
+ .property = NULL, \
+ .reg_addr = SX932X_REG_ADV_CTRL11, \
+ .def_value = (5 << 4) | 2, \
+ }, \
+ { \
+ .property = NULL, \
+ .reg_addr = SX932X_REG_ADV_CTRL12, \
+ .def_value = (11 << 4) | 5, \
+ }, \
+ SX932X_REG_CONFIG(_property_prefix, "adv_ctrl10", \
+ ADV_CTRL10, (5 << 4) | 12), \
+ SX932X_REG_CONFIG(_property_prefix, "afe_ctrl4", \
+ AFE_CTRL4, 7), \
+ SX932X_REG_CONFIG(_property_prefix, "afe_ctrl7", \
+ AFE_CTRL7, 7), \
+ SX932X_REG_CONFIG(_property_prefix, "afe_ctrl9", \
+ AFE_CTRL9, 15), \
+ SX932X_REG_CONFIG(_property_prefix, "prox_ctrl0", \
+ PROX_CTRL0, (2 << 3) | 2), \
+ SX932X_REG_CONFIG(_property_prefix, "prox_ctrl1", \
+ PROX_CTRL1, (2 << 3) | 2), \
+ SX932X_REG_CONFIG(_property_prefix, "prox_ctrl2", \
+ PROX_CTRL2, 0x80 | 16), \
+ SX932X_REG_CONFIG(_property_prefix, "prox_ctrl4", \
+ PROX_CTRL4, (1 << 3) | 4), \
+ SX932X_REG_CONFIG(_property_prefix, "prox_ctrl5", \
+ PROX_CTRL5, (1 << 4) | 2), \
+ SX932X_REG_CONFIG(_property_prefix, "prox_ctrl6", \
+ PROX_CTRL6, 60), \
+ SX932X_REG_CONFIG(_property_prefix, "prox_ctrl7", \
+ PROX_CTRL7, 88), \
+ SX932X_REG_CONFIG(_property_prefix, "adv_ctrl16", \
+ ADV_CTRL16, (3 << 4) | (2 << 2)), \
+ SX932X_REG_CONFIG(_property_prefix, "adv_ctrl17", \
+ ADV_CTRL17, (5 << 4) | 6), \
+ SX932X_REG_CONFIG(_property_prefix, "adv_ctrl18", \
+ ADV_CTRL18, (3 << 4) | 3), \
+ SX932X_REG_CONFIG(_property_prefix, "gnrl_ctrl1", \
+ GNRL_CTRL1, 0x2f), \
+ { \
+ .property = NULL, \
+ .reg_addr = 0, \
+ .def_value = 0, \
+ }, \
+ }
+
+#ifdef CONFIG_ACPI
+static const struct sx932x_reg_config sx9320_reg_config[] =
+ SX932X_DEFAULT_REG_CONFIGS(SX9320_ACPI_NAME);
+static const struct sx932x_reg_config sx9321_reg_config[] =
+ SX932X_DEFAULT_REG_CONFIGS(SX9321_ACPI_NAME);
+static const struct sx932x_reg_config sx9324_reg_config[] =
+ SX932X_DEFAULT_REG_CONFIGS(SX9324_ACPI_NAME);
+#else
+static const struct sx932x_reg_config sx9320_reg_config[] =
+ SX932X_DEFAULT_REG_CONFIGS("semtech,");
+static const struct sx932x_reg_config sx9321_reg_config[] =
+ SX932X_DEFAULT_REG_CONFIGS("semtech,");
+static const struct sx932x_reg_config sx9324_reg_config[] =
+ SX932X_DEFAULT_REG_CONFIGS("semtech,");
+#endif
+static const struct sx932x_reg_config *sx932x_reg_configs[] = {
+ sx9320_reg_config, sx9321_reg_config, sx9324_reg_config
+};
+static int sx932x_read_register_property(struct device *dev,
+ const struct sx932x_reg_config *cfg,
+ u8 *value)
+{
+#ifdef CONFIG_ACPI
+ const union acpi_object *acpi_value = NULL;
+#endif
+ int ret;
+
+ if ((dev == NULL) || (cfg->property == NULL)) {
+ *value = cfg->def_value;
+ return 0;
+ }
+
+#ifdef CONFIG_ACPI
+ ret = acpi_dev_get_property(ACPI_COMPANION(dev), cfg->property,
+ ACPI_TYPE_INTEGER, &acpi_value);
+#else
+ ret = of_property_read_u8(dev->of_node, cfg->property, value);
+#endif
+ if (ret)
+ *value = cfg->def_value;
+#ifdef CONFIG_ACPI
+ *value = acpi_value ? (u8)acpi_value->integer.value : cfg->def_value;
+#endif
+ return 0;
+}
+
+static int sx932x_load_config(struct device *dev, struct sx932x_data *data)
+{
+ u8 val;
+ int i, ret;
+ const struct sx932x_reg_config *cfg;
+
+ for (i = 0; data->reg_config[i].reg_addr != 0; i++) {
+ cfg = &data->reg_config[i];
+ ret = sx932x_read_register_property(dev, cfg, &val);
+ if (ret < 0)
+ return ret;
+ ret = regmap_write(data->regmap, cfg->reg_addr, val);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
+/* Activate all channels and perform an initial compensation. */
+static int sx932x_init_compensation(struct iio_dev *indio_dev)
+{
+ struct sx932x_data *data = iio_priv(indio_dev);
+ int i, ret;
+ bool success = false;
+ unsigned int val;
+
+ for (i = 100; i >= 0; i--) {
+ usleep_range(10000, 20000);
+ ret = regmap_read(data->regmap, SX932X_REG_STAT2, &val);
+ if (ret < 0)
+ goto out;
+ if (!(val & SX932X_COMPSTAT_MASK)) {
+ success = true;
+ break;
+ }
+ }
+
+ if (success) {
+ dev_info(&data->client->dev,
+ "initial compensation success");
+ } else {
+ dev_err(&data->client->dev,
+ "initial compensation timed out: 0x%02x", val);
+ ret = -ETIMEDOUT;
+ }
+
+out:
+ return ret;
+}
+
+static int sx932x_init_device(struct iio_dev *indio_dev)
+{
+ struct device *dev = &indio_dev->dev;
+ struct sx932x_data *data = iio_priv(indio_dev);
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(data->regmap, SX932X_REG_WHOAMI, &val);
+ if (ret < 0 || (val != SX9320_WHOAMI && val != SX9321_WHOAMI &&
+ val != SX9324_WHOAMI)) {
+ dev_err(&data->client->dev,
+ "Unable to identify the chip: %d - 0x%02x", ret, val);
+ return -ENODEV;
+ }
+
+ ret = regmap_write(data->regmap, SX932X_REG_IRQ_MSK, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(data->regmap, SX932X_REG_RESET,
+ SX932X_SOFT_RESET);
+ if (ret < 0)
+ return ret;
+
+ // wait for the reset to be completed
+ usleep_range(10000, 20000);
+
+ ret = regmap_write(data->regmap, SX932X_REG_RESET, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read(data->regmap, SX932X_REG_IRQ_SRC, &val);
+ if (ret < 0)
+ return ret;
+
+ ret = sx932x_load_config(dev, data);
+ if (ret < 0)
+ return ret;
+
+ return sx932x_init_compensation(indio_dev);
+}
+
+static int sx932x_probe(struct i2c_client *client,
+ const struct i2c_device_id *i2c_id)
+{
+ int ret;
+ struct iio_dev *indio_dev;
+ const struct acpi_device_id *acpi_id;
+ struct sx932x_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;
+ if (i2c_id) {
+ data->reg_config = sx932x_reg_configs[i2c_id->driver_data];
+ } else if (ACPI_HANDLE(&client->dev)) {
+ acpi_id = acpi_match_device(
+ client->dev.driver->acpi_match_table,
+ &client->dev);
+ if (!acpi_id) {
+ dev_err(&client->dev, "No driver data\n");
+ return -EINVAL;
+ }
+ data->reg_config = sx932x_reg_configs[acpi_id->driver_data];
+ } else {
+ return -ENODEV;
+ }
+ mutex_init(&data->mutex);
+ init_completion(&data->completion);
+ data->trigger_enabled = false;
+
+ data->regmap = devm_regmap_init_i2c(client, &sx932x_regmap_config);
+ if (IS_ERR(data->regmap))
+ return PTR_ERR(data->regmap);
+ ACPI_COMPANION_SET(&indio_dev->dev, ACPI_COMPANION(&client->dev));
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->name = SX932X_DRIVER_NAME;
+ indio_dev->channels = sx932x_channels;
+ indio_dev->num_channels = ARRAY_SIZE(sx932x_channels);
+ indio_dev->info = &sx932x_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ i2c_set_clientdata(client, indio_dev);
+
+ ret = sx932x_init_device(indio_dev);
+ if (ret < 0) {
+ dev_err(&client->dev, "tried to init sx932x - error %d\n",
+ ret);
+ 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,
+ sx932x_irq_handler, sx932x_irq_thread_handler,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ SX932X_IRQ_NAME, indio_dev);
+ if (ret < 0)
+ return ret;
+
+ data->trig = devm_iio_trigger_alloc(&client->dev,
+ "%s-dev%d", indio_dev->name, indio_dev->id);
+ if (!data->trig)
+ return -ENOMEM;
+
+ data->trig->dev.parent = &client->dev;
+ data->trig->ops = &sx932x_trigger_ops;
+ iio_trigger_set_drvdata(data->trig, indio_dev);
+
+ ret = iio_trigger_register(data->trig);
+ if (ret)
+ return ret;
+ }
+
+ ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
+ NULL, sx932x_trigger_handler,
+ &sx932x_buffer_setup_ops);
+ if (ret < 0)
+ goto out_trigger_unregister;
+
+ ret = devm_iio_device_register(&client->dev, indio_dev);
+ if (ret < 0)
+ goto out_trigger_unregister;
+
+ return 0;
+
+out_trigger_unregister:
+ if (client->irq > 0)
+ iio_trigger_unregister(data->trig);
+
+ return ret;
+}
+
+static int sx932x_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct sx932x_data *data = iio_priv(indio_dev);
+
+ if (client->irq > 0)
+ iio_trigger_unregister(data->trig);
+ kfree(data->buffer);
+ return 0;
+}
+
+static int __maybe_unused sx932x_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct sx932x_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_read(data->regmap, SX932X_REG_GNRL_CTRL1,
+ &data->suspend_reg_gnrl_ctrl1);
+
+ if (ret < 0)
+ goto out;
+
+ // disable all phases, send the device to sleep
+ ret = regmap_write(data->regmap, SX932X_REG_GNRL_CTRL1, 0);
+
+out:
+ mutex_unlock(&data->mutex);
+ return ret;
+}
+
+static int __maybe_unused sx932x_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct sx932x_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_write(data->regmap, SX932X_REG_GNRL_CTRL1,
+ data->suspend_reg_gnrl_ctrl1);
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static const struct dev_pm_ops sx932x_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(sx932x_suspend, sx932x_resume)
+};
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id sx932x_acpi_match[] = {
+ { SX9320_ACPI_NAME, 0 },
+ { SX9321_ACPI_NAME, 1 },
+ { SX9324_ACPI_NAME, 2 },
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, sx932x_acpi_match);
+#endif
+#ifdef CONFIG_OF
+static const struct of_device_id sx932x_of_match[] = {
+ { .compatible = "semtech,sx9320" },
+ { .compatible = "semtech,sx9321" },
+ { .compatible = "semtech,sx9324" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, sx932x_of_match);
+#endif
+static const struct i2c_device_id sx932x_id[] = {
+ { "sx9320", 0 },
+ { "sx9321", 1 },
+ { "sx9324", 2 },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, sx932x_id);
+
+static struct i2c_driver sx932x_driver = {
+ .driver = {
+ .name = SX932X_DRIVER_NAME,
+ .acpi_match_table = ACPI_PTR(sx932x_acpi_match),
+ .of_match_table = of_match_ptr(sx932x_of_match),
+ .pm = &sx932x_pm_ops,
+ },
+ .probe = sx932x_probe,
+ .remove = sx932x_remove,
+ .id_table = sx932x_id,
+};
+module_i2c_driver(sx932x_driver);
+
+MODULE_AUTHOR("Enrico Granata <egranata@...omium.org>");
+MODULE_AUTHOR("Gwendal Grignou <gwendal@...omium.org>");
+MODULE_AUTHOR("Pat Plunkett <patplunkett@...gle.com");
+MODULE_DESCRIPTION("Driver for Semtech SX9320/SX9321/SX9324 proximity sensor");
+MODULE_LICENSE("GPL v2");
--
2.19.1.930.g4563a0d9d0-goog
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