From patchwork Mon Oct 21 04:11:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff LaBundy X-Patchwork-Id: 11201293 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 80FD11920 for ; Mon, 21 Oct 2019 04:19:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 60044205ED for ; Mon, 21 Oct 2019 04:19:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727067AbfJUETV (ORCPT ); Mon, 21 Oct 2019 00:19:21 -0400 Received: from p3plsmtpa06-04.prod.phx3.secureserver.net ([173.201.192.105]:41382 "EHLO p3plsmtpa06-04.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727088AbfJUETV (ORCPT ); Mon, 21 Oct 2019 00:19:21 -0400 X-Greylist: delayed 438 seconds by postgrey-1.27 at vger.kernel.org; Mon, 21 Oct 2019 00:19:10 EDT Received: from localhost.localdomain ([136.49.227.119]) by :SMTPAUTH: with ESMTPSA id MP2oifB4Hr3FgMP34iDyaS; Sun, 20 Oct 2019 21:12:03 -0700 From: Jeff LaBundy To: lee.jones@linaro.org, dmitry.torokhov@gmail.com, jdelvare@suse.com, linux@roeck-us.net, thierry.reding@gmail.com, jic23@kernel.org, devicetree@vger.kernel.org Cc: linux-input@vger.kernel.org, linux-hwmon@vger.kernel.org, u.kleine-koenig@pengutronix.de, linux-pwm@vger.kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, linux-iio@vger.kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, Jeff LaBundy Subject: [PATCH 7/8] iio: proximity: Add support for Azoteq IQS622 proximity sensor Date: Sun, 20 Oct 2019 23:11:22 -0500 Message-Id: <1571631083-4962-8-git-send-email-jeff@labundy.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1571631083-4962-1-git-send-email-jeff@labundy.com> References: <1571631083-4962-1-git-send-email-jeff@labundy.com> X-CMAE-Envelope: MS4wfIkzzZVfj8/JXJzazJ5RoIxcPinmvXvFinYNcuYnwgpjVBaXpXfmn/3/u9YQhHWXgyLs5yTeootfZ6rrohzedVYQrVI43psTSpVY9Ie/3ioIQiBIxoZH NT0ePzifatp81btnudgMVeY5e5xuNx4OnrBXsc6aSsQbUqOYlc0Gp6nyejsVfKwLVbI0/73Hsuaf6uGzr7emTAsos5llshZbClELOCogPEd68p3usp1Sedv0 h8RnrlExl13vv9aPnuZ+iICYx+LSZ1YPz2NQl9DkROXhgE1Yc/7PwhAO6Yic9NfiiOoqn2mWxWGDFpjJoMdWdpVhEztKyyU5oWpXDKpDS6yxhjhtE0SPz+hp 5m1CrTPIcmSikqYj2z1Rk3v9K1svV2iPfUkqVRufLY5ItuL+g5LeYe67mjsR3NRnPnSt6S34fm/YejpRwZrHpoPzMirr3/yL5bVy4Mn3AtYtcbnhYWkrRx9I bMjNQZYcVS8lv5ytYu7Wbn3AeHuFkLHPuPEzC3v4qMkXItSTbgYiN38DQGEK5rDrpug7E99LIyV4lsCacLCvo8NLt6I2yMiCEXqDZNazRY8Zq2+8xtFWd2Hi DafRzh2ezMV+5dS2veYmhKbwRLp9kaihMDndkHb4QoX8GEqkiDg3lRENhSGEsk6n6JyvclEd9uk1m3MjfiNFGGQVHFjnJ4AToMlfKEGu/QfVRgskH9IcIMVZ e8hU7JR3KaIYXTy4F4zUtM9IelfoEN8/Wx6q1fIiT5lQdqV/+cj4nw== Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org This patch adds support for the Azoteq IQS622 proximity sensor, capable of reporting a unitless measurement of a target's prox- imity to the sensor. Signed-off-by: Jeff LaBundy --- drivers/iio/proximity/Kconfig | 10 ++ drivers/iio/proximity/Makefile | 1 + drivers/iio/proximity/iqs622-prox.c | 334 ++++++++++++++++++++++++++++++++++++ 3 files changed, 345 insertions(+) create mode 100644 drivers/iio/proximity/iqs622-prox.c diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig index d536014..2366fd7 100644 --- a/drivers/iio/proximity/Kconfig +++ b/drivers/iio/proximity/Kconfig @@ -21,6 +21,16 @@ endmenu menu "Proximity and distance sensors" +config IQS622_PROX + tristate "Azoteq IQS622 proximity sensor" + depends on MFD_IQS62X + help + Say Y here if you want to build support for the Azoteq IQS622 + proximity sensor. + + To compile this driver as a module, choose M here: the module + will be called iqs622-prox. + config ISL29501 tristate "Intersil ISL29501 Time Of Flight sensor" depends on I2C diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile index 0bb5f9d..802ba9d 100644 --- a/drivers/iio/proximity/Makefile +++ b/drivers/iio/proximity/Makefile @@ -5,6 +5,7 @@ # When adding new entries keep the list in alphabetical order obj-$(CONFIG_AS3935) += as3935.o +obj-$(CONFIG_IQS622_PROX) += iqs622-prox.o obj-$(CONFIG_ISL29501) += isl29501.o obj-$(CONFIG_LIDAR_LITE_V2) += pulsedlight-lidar-lite-v2.o obj-$(CONFIG_MB1232) += mb1232.o diff --git a/drivers/iio/proximity/iqs622-prox.c b/drivers/iio/proximity/iqs622-prox.c new file mode 100644 index 0000000..a805fb21 --- /dev/null +++ b/drivers/iio/proximity/iqs622-prox.c @@ -0,0 +1,334 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Azoteq IQS622 Proximity Sensor + * + * Copyright (C) 2019 + * Author: Jeff LaBundy + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define IQS622_IR_FLAGS 0x16 +#define IQS622_IR_FLAGS_TOUCH BIT(1) +#define IQS622_IR_FLAGS_PROX BIT(0) + +#define IQS622_IR_UI_OUT 0x17 + +#define IQS622_IR_THRESH_PROX 0x91 +#define IQS622_IR_THRESH_PROX_MAX 255 +#define IQS622_IR_THRESH_PROX_SHIFT 0 + +#define IQS622_IR_THRESH_TOUCH 0x92 +#define IQS622_IR_THRESH_TOUCH_MAX 1020 +#define IQS622_IR_THRESH_TOUCH_SHIFT 2 + +struct iqs622_prox_private { + struct iqs62x_core *iqs62x; + struct notifier_block notifier; + struct mutex lock; + bool thresh_prox; + bool event_en; + u8 thresh; + u8 flags; +}; + +static int iqs622_prox_init(struct iqs622_prox_private *iqs622_prox) +{ + struct iqs62x_core *iqs62x = iqs622_prox->iqs62x; + unsigned int val; + int error; + + mutex_lock(&iqs622_prox->lock); + + error = regmap_write(iqs62x->map, + iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX : + IQS622_IR_THRESH_TOUCH, + iqs622_prox->thresh); + if (error) + goto err_mutex; + + error = regmap_read(iqs62x->map, IQS622_IR_FLAGS, &val); + if (error) + goto err_mutex; + iqs622_prox->flags = val; + + error = regmap_update_bits(iqs62x->map, IQS620_GLBL_EVENT_MASK, + iqs62x->dev_desc->ir_mask, + iqs622_prox->event_en ? 0 : 0xFF); + +err_mutex: + mutex_unlock(&iqs622_prox->lock); + + return error; +} + +static int iqs622_prox_notifier(struct notifier_block *notifier, + unsigned long event_flags, void *context) +{ + struct iqs62x_event_data *event_data = context; + struct iqs622_prox_private *iqs622_prox; + struct iio_dev *indio_dev; + enum iio_event_direction dir; + int error; + u8 flags_mask; + + iqs622_prox = container_of(notifier, struct iqs622_prox_private, + notifier); + indio_dev = iio_priv_to_dev(iqs622_prox); + + if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) { + error = iqs622_prox_init(iqs622_prox); + if (error) { + dev_err(indio_dev->dev.parent, + "Failed to re-initialize device: %d\n", error); + return NOTIFY_BAD; + } + + return NOTIFY_OK; + } + + flags_mask = iqs622_prox->thresh_prox ? IQS622_IR_FLAGS_PROX : + IQS622_IR_FLAGS_TOUCH; + + if (!((event_data->ir_flags ^ iqs622_prox->flags) & flags_mask)) + return NOTIFY_DONE; + + iqs622_prox->flags = event_data->ir_flags; + + if (!iqs622_prox->event_en) + return NOTIFY_OK; + + dir = iqs622_prox->flags & flags_mask ? IIO_EV_DIR_RISING : + IIO_EV_DIR_FALLING; + + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, + IIO_EV_TYPE_THRESH, dir), + iio_get_time_ns(indio_dev)); + + return NOTIFY_OK; +} + +static void iqs622_prox_notifier_unregister(void *context) +{ + struct iqs622_prox_private *iqs622_prox = context; + struct iio_dev *indio_dev = iio_priv_to_dev(iqs622_prox); + int error; + + error = blocking_notifier_chain_unregister(&iqs622_prox->iqs62x->nh, + &iqs622_prox->notifier); + if (error) + dev_err(indio_dev->dev.parent, + "Failed to unregister notifier: %d\n", error); +} + +static int iqs622_prox_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct iqs622_prox_private *iqs622_prox = iio_priv(indio_dev); + struct iqs62x_core *iqs62x = iqs622_prox->iqs62x; + int error; + __le16 val_buf; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + error = regmap_raw_read(iqs62x->map, IQS622_IR_UI_OUT, + &val_buf, sizeof(val_buf)); + if (error) + return error; + + *val = le16_to_cpu(val_buf); + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int iqs622_prox_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 iqs622_prox_private *iqs622_prox = iio_priv(indio_dev); + + return iqs622_prox->event_en; +} + +static int iqs622_prox_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 iqs622_prox_private *iqs622_prox = iio_priv(indio_dev); + struct iqs62x_core *iqs62x = iqs622_prox->iqs62x; + int error; + + mutex_lock(&iqs622_prox->lock); + + error = regmap_update_bits(iqs62x->map, IQS620_GLBL_EVENT_MASK, + iqs62x->dev_desc->ir_mask, state ? 0 : 0xFF); + if (!error) + iqs622_prox->event_en = state; + + mutex_unlock(&iqs622_prox->lock); + + return error; +} + +static int iqs622_prox_read_event_value(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int *val, int *val2) +{ + struct iqs622_prox_private *iqs622_prox = iio_priv(indio_dev); + + *val = iqs622_prox->thresh; + *val <<= (iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX_SHIFT : + IQS622_IR_THRESH_TOUCH_SHIFT); + + return IIO_VAL_INT; +} + +static int iqs622_prox_write_event_value(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int val, int val2) +{ + struct iqs622_prox_private *iqs622_prox = iio_priv(indio_dev); + struct iqs62x_core *iqs62x = iqs622_prox->iqs62x; + int error = -EINVAL; + + mutex_lock(&iqs622_prox->lock); + + if (val > (iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX_MAX : + IQS622_IR_THRESH_TOUCH_MAX)) + goto err_mutex; + val >>= (iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX_SHIFT : + IQS622_IR_THRESH_TOUCH_SHIFT); + + error = regmap_write(iqs62x->map, + iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX : + IQS622_IR_THRESH_TOUCH, + val); + if (!error) + iqs622_prox->thresh = val; + +err_mutex: + mutex_unlock(&iqs622_prox->lock); + + return error; +} + +static const struct iio_info iqs622_prox_info = { + .read_raw = &iqs622_prox_read_raw, + .read_event_config = iqs622_prox_read_event_config, + .write_event_config = iqs622_prox_write_event_config, + .read_event_value = iqs622_prox_read_event_value, + .write_event_value = iqs622_prox_write_event_value, +}; + +static const struct iio_event_spec iqs622_prox_events[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_EITHER, + .mask_separate = BIT(IIO_EV_INFO_ENABLE) | + BIT(IIO_EV_INFO_VALUE), + }, +}; + +static const struct iio_chan_spec iqs622_prox_channels[] = { + { + .type = IIO_PROXIMITY, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .event_spec = iqs622_prox_events, + .num_event_specs = ARRAY_SIZE(iqs622_prox_events), + }, +}; + +static int iqs622_prox_probe(struct platform_device *pdev) +{ + struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent); + struct iqs622_prox_private *iqs622_prox; + struct iio_dev *indio_dev; + unsigned int val; + int error; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*iqs622_prox)); + if (!indio_dev) + return -ENOMEM; + + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->dev.parent = &pdev->dev; + indio_dev->channels = iqs622_prox_channels; + indio_dev->num_channels = ARRAY_SIZE(iqs622_prox_channels); + indio_dev->name = iqs62x->dev_desc->dev_name; + indio_dev->info = &iqs622_prox_info; + + iqs622_prox = iio_priv(indio_dev); + iqs622_prox->iqs62x = iqs62x; + + iqs622_prox->thresh_prox = device_property_read_bool(&pdev->dev, + "azoteq,use-prox"); + + error = regmap_read(iqs62x->map, + iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX : + IQS622_IR_THRESH_TOUCH, + &val); + if (error) + return error; + iqs622_prox->thresh = val; + + mutex_init(&iqs622_prox->lock); + + error = iqs622_prox_init(iqs622_prox); + if (error) + return error; + + iqs622_prox->notifier.notifier_call = iqs622_prox_notifier; + error = blocking_notifier_chain_register(&iqs622_prox->iqs62x->nh, + &iqs622_prox->notifier); + if (error) { + dev_err(&pdev->dev, "Failed to register notifier: %d\n", error); + return error; + } + + error = devm_add_action_or_reset(&pdev->dev, + iqs622_prox_notifier_unregister, + iqs622_prox); + if (error) { + dev_err(&pdev->dev, "Failed to add action: %d\n", error); + return error; + } + + return devm_iio_device_register(&pdev->dev, indio_dev); +} + +static struct platform_driver iqs622_prox_platform_driver = { + .driver = { + .name = IQS622_DRV_NAME_PROX, + }, + .probe = iqs622_prox_probe, +}; +module_platform_driver(iqs622_prox_platform_driver); + +MODULE_AUTHOR("Jeff LaBundy "); +MODULE_DESCRIPTION("Azoteq IQS622 Proximity Sensor"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" IQS622_DRV_NAME_PROX);