From patchwork Mon Oct 21 04:11:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff LaBundy X-Patchwork-Id: 11201291 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 F128D13BD for ; Mon, 21 Oct 2019 04:19:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C5E24205ED for ; Mon, 21 Oct 2019 04:19:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727096AbfJUETW (ORCPT ); Mon, 21 Oct 2019 00:19:22 -0400 Received: from p3plsmtpa06-04.prod.phx3.secureserver.net ([173.201.192.105]:48455 "EHLO p3plsmtpa06-04.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727078AbfJUETV (ORCPT ); Mon, 21 Oct 2019 00:19:21 -0400 Received: from localhost.localdomain ([136.49.227.119]) by :SMTPAUTH: with ESMTPSA id MP2oifB4Hr3FgMP33iDya4; Sun, 20 Oct 2019 21:12:02 -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 6/8] iio: light: Add support for Azoteq IQS621 ambient light sensor Date: Sun, 20 Oct 2019 23:11:21 -0500 Message-Id: <1571631083-4962-7-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: MS4wfDNBRBXQUqGeHFA34QH49iQWu6Gjin5dX159Rr/RinU6vZFqRQCmRNDvJsSlymlHj/k2sOSptwUSSK9WILmJGWYz5OpHObHbVHtfXbZn8/INHzeO4+ka 9n+ZbVsovARLHXO1N4K85cyuBko89QLumAw7/mYjUm4FP4wULNyHkrV1YgluFTfmVfLBk8am08Ft+szjXiU1oCtfRB03kzYjW/nspNiQmNo++yqAxUohtRfR Y11RTC1+j7ddQkEGAjMyeLfFLOFJM2xYQ/NKAZ70vKTcZADC8WlQH69Dr9gFQVuW3btGp7qC5iqhkhUf94bTqsyFoSGis/9Dz0lHTxgOFKjVk8bsv3QxMozn Yk31J1Iaw3TsWO0MIcG6Sw88ssuro7+1HxliqO7ZVQ4KfFKEyfTvHkrnPi4RkElmiLT8eS//Ae3zxH2i8Z8j0IzJ59nPprrUiFeQKI1zrz0+6+tDBIKSoi0r 9I6Ew3xT52r5dClaKtFbCdq1K+I4zFDNYRi3OsGMSYvXHLLrl9EmxiyZxmngnMsc8fwlifVtBwGAClZhhiyTh0U4K8tDpBnTZ3gu8BbdDEHSXtOvBHXirQLz AtLdGCxdPdz2ZcHVJmgTrWz1gzohMxaKxKkUa9Y4W4+sq3A3dY5yRhffaT1opH2tQZWIY/vZkeSEN6ulujOZmamVBnTWj1Bh+rETnHd93aHYoiaLrUUqx9DH Wx24T/CjYKNc//Li32Dmfu14mc40GcxO8jy7wVcKabCVn4wJprqdPQ== Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org This patch adds support for the Azoteq IQS621 ambient light sensor, capable of reporting intensity directly in units of lux. Signed-off-by: Jeff LaBundy Acked-by: Jonathan Cameron --- drivers/iio/light/Kconfig | 10 ++ drivers/iio/light/Makefile | 1 + drivers/iio/light/iqs621-als.c | 361 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 372 insertions(+) create mode 100644 drivers/iio/light/iqs621-als.c diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 4a1a883..aad26dc 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -162,6 +162,16 @@ config GP2AP020A00F To compile this driver as a module, choose M here: the module will be called gp2ap020a00f. +config IQS621_ALS + tristate "Azoteq IQS621 ambient light sensor" + depends on MFD_IQS62X + help + Say Y here if you want to build support for the Azoteq IQS621 + ambient light sensor. + + To compile this driver as a module, choose M here: the module + will be called iqs621-als. + config SENSORS_ISL29018 tristate "Intersil 29018 light and proximity sensor" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index 00d1f9b..aa34358 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_IIO_CROS_EC_LIGHT_PROX) += cros_ec_light_prox.o obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o obj-$(CONFIG_HID_SENSOR_PROX) += hid-sensor-prox.o +obj-$(CONFIG_IQS621_ALS) += iqs621-als.o obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o obj-$(CONFIG_SENSORS_ISL29028) += isl29028.o obj-$(CONFIG_ISL29125) += isl29125.o diff --git a/drivers/iio/light/iqs621-als.c b/drivers/iio/light/iqs621-als.c new file mode 100644 index 0000000..92a6173 --- /dev/null +++ b/drivers/iio/light/iqs621-als.c @@ -0,0 +1,361 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Azoteq IQS621 Ambient Light Sensor + * + * Copyright (C) 2019 + * Author: Jeff LaBundy + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define IQS621_ALS_FLAGS 0x16 +#define IQS621_ALS_FLAGS_LIGHT BIT(7) + +#define IQS621_ALS_UI_OUT 0x17 + +#define IQS621_ALS_THRESH_DARK 0x80 +#define IQS621_ALS_THRESH_DARK_MAX 1020 +#define IQS621_ALS_THRESH_DARK_SHIFT 2 + +#define IQS621_ALS_THRESH_LIGHT 0x81 +#define IQS621_ALS_THRESH_LIGHT_MAX 4080 +#define IQS621_ALS_THRESH_LIGHT_SHIFT 4 + +struct iqs621_als_private { + struct iqs62x_core *iqs62x; + struct notifier_block notifier; + struct mutex lock; + bool event_en; + u8 thresh_light; + u8 thresh_dark; + u8 flags; +}; + +static int iqs621_als_init(struct iqs621_als_private *iqs621_als) +{ + struct iqs62x_core *iqs62x = iqs621_als->iqs62x; + unsigned int val; + int error; + + mutex_lock(&iqs621_als->lock); + + error = regmap_write(iqs62x->map, IQS621_ALS_THRESH_LIGHT, + iqs621_als->thresh_light); + if (error) + goto err_mutex; + + error = regmap_write(iqs62x->map, IQS621_ALS_THRESH_DARK, + iqs621_als->thresh_dark); + if (error) + goto err_mutex; + + error = regmap_read(iqs62x->map, IQS621_ALS_FLAGS, &val); + if (error) + goto err_mutex; + iqs621_als->flags = val; + + error = regmap_update_bits(iqs62x->map, IQS620_GLBL_EVENT_MASK, + iqs62x->dev_desc->als_mask, + iqs621_als->event_en ? 0 : 0xFF); + +err_mutex: + mutex_unlock(&iqs621_als->lock); + + return error; +} + +static int iqs621_als_notifier(struct notifier_block *notifier, + unsigned long event_flags, void *context) +{ + struct iqs62x_event_data *event_data = context; + struct iqs621_als_private *iqs621_als; + struct iio_dev *indio_dev; + enum iio_event_direction dir; + int error; + + iqs621_als = container_of(notifier, struct iqs621_als_private, + notifier); + indio_dev = iio_priv_to_dev(iqs621_als); + + if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) { + error = iqs621_als_init(iqs621_als); + if (error) { + dev_err(indio_dev->dev.parent, + "Failed to re-initialize device: %d\n", error); + return NOTIFY_BAD; + } + + return NOTIFY_OK; + } + + if (!((event_data->als_flags ^ iqs621_als->flags) & + IQS621_ALS_FLAGS_LIGHT)) + return NOTIFY_DONE; + + iqs621_als->flags = event_data->als_flags; + + if (!iqs621_als->event_en) + return NOTIFY_OK; + + dir = iqs621_als->flags & IQS621_ALS_FLAGS_LIGHT ? IIO_EV_DIR_RISING : + IIO_EV_DIR_FALLING; + + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, + IIO_EV_TYPE_THRESH, dir), + iio_get_time_ns(indio_dev)); + + return NOTIFY_OK; +} + +static void iqs621_als_notifier_unregister(void *context) +{ + struct iqs621_als_private *iqs621_als = context; + struct iio_dev *indio_dev = iio_priv_to_dev(iqs621_als); + int error; + + error = blocking_notifier_chain_unregister(&iqs621_als->iqs62x->nh, + &iqs621_als->notifier); + if (error) + dev_err(indio_dev->dev.parent, + "Failed to unregister notifier: %d\n", error); +} + +static int iqs621_als_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct iqs621_als_private *iqs621_als = iio_priv(indio_dev); + struct iqs62x_core *iqs62x = iqs621_als->iqs62x; + int error; + __le16 val_buf; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + error = regmap_raw_read(iqs62x->map, IQS621_ALS_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 iqs621_als_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 iqs621_als_private *iqs621_als = iio_priv(indio_dev); + + return iqs621_als->event_en; +} + +static int iqs621_als_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 iqs621_als_private *iqs621_als = iio_priv(indio_dev); + struct iqs62x_core *iqs62x = iqs621_als->iqs62x; + int error; + + mutex_lock(&iqs621_als->lock); + + error = regmap_update_bits(iqs62x->map, IQS620_GLBL_EVENT_MASK, + iqs62x->dev_desc->als_mask, + state ? 0 : 0xFF); + if (!error) + iqs621_als->event_en = state; + + mutex_unlock(&iqs621_als->lock); + + return error; +} + +static int iqs621_als_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 iqs621_als_private *iqs621_als = iio_priv(indio_dev); + + switch (dir) { + case IIO_EV_DIR_RISING: + *val = iqs621_als->thresh_light; + *val <<= IQS621_ALS_THRESH_LIGHT_SHIFT; + return IIO_VAL_INT; + + case IIO_EV_DIR_FALLING: + *val = iqs621_als->thresh_dark; + *val <<= IQS621_ALS_THRESH_DARK_SHIFT; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int iqs621_als_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 iqs621_als_private *iqs621_als = iio_priv(indio_dev); + struct iqs62x_core *iqs62x = iqs621_als->iqs62x; + int error = -EINVAL; + + mutex_lock(&iqs621_als->lock); + + switch (dir) { + case IIO_EV_DIR_RISING: + if (val > IQS621_ALS_THRESH_LIGHT_MAX) + break; + val >>= IQS621_ALS_THRESH_LIGHT_SHIFT; + + error = regmap_write(iqs62x->map, IQS621_ALS_THRESH_LIGHT, val); + if (!error) + iqs621_als->thresh_light = val; + break; + + case IIO_EV_DIR_FALLING: + if (val > IQS621_ALS_THRESH_DARK) + break; + val >>= IQS621_ALS_THRESH_DARK_SHIFT; + + error = regmap_write(iqs62x->map, IQS621_ALS_THRESH_DARK, val); + if (!error) + iqs621_als->thresh_dark = val; + break; + + default: + break; + } + + mutex_unlock(&iqs621_als->lock); + + return error; +} + +static const struct iio_info iqs621_als_info = { + .read_raw = &iqs621_als_read_raw, + .read_event_config = iqs621_als_read_event_config, + .write_event_config = iqs621_als_write_event_config, + .read_event_value = iqs621_als_read_event_value, + .write_event_value = iqs621_als_write_event_value, +}; + +static const struct iio_event_spec iqs621_als_events[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_EITHER, + .mask_separate = BIT(IIO_EV_INFO_ENABLE), + }, + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_VALUE), + }, + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_VALUE), + }, +}; + +static const struct iio_chan_spec iqs621_als_channels[] = { + { + .type = IIO_LIGHT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .event_spec = iqs621_als_events, + .num_event_specs = ARRAY_SIZE(iqs621_als_events), + }, +}; + +static int iqs621_als_probe(struct platform_device *pdev) +{ + struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent); + struct iqs621_als_private *iqs621_als; + struct iio_dev *indio_dev; + unsigned int val; + int error; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*iqs621_als)); + if (!indio_dev) + return -ENOMEM; + + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->dev.parent = &pdev->dev; + indio_dev->channels = iqs621_als_channels; + indio_dev->num_channels = ARRAY_SIZE(iqs621_als_channels); + indio_dev->name = iqs62x->dev_desc->dev_name; + indio_dev->info = &iqs621_als_info; + + iqs621_als = iio_priv(indio_dev); + iqs621_als->iqs62x = iqs62x; + + error = regmap_read(iqs62x->map, IQS621_ALS_THRESH_LIGHT, &val); + if (error) + return error; + iqs621_als->thresh_light = val; + + error = regmap_read(iqs62x->map, IQS621_ALS_THRESH_DARK, &val); + if (error) + return error; + iqs621_als->thresh_dark = val; + + mutex_init(&iqs621_als->lock); + + error = iqs621_als_init(iqs621_als); + if (error) + return error; + + iqs621_als->notifier.notifier_call = iqs621_als_notifier; + error = blocking_notifier_chain_register(&iqs621_als->iqs62x->nh, + &iqs621_als->notifier); + if (error) { + dev_err(&pdev->dev, "Failed to register notifier: %d\n", error); + return error; + } + + error = devm_add_action_or_reset(&pdev->dev, + iqs621_als_notifier_unregister, + iqs621_als); + 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 iqs621_als_platform_driver = { + .driver = { + .name = IQS621_DRV_NAME_ALS, + }, + .probe = iqs621_als_probe, +}; +module_platform_driver(iqs621_als_platform_driver); + +MODULE_AUTHOR("Jeff LaBundy "); +MODULE_DESCRIPTION("Azoteq IQS621 Ambient Light Sensor"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" IQS621_DRV_NAME_ALS);