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[23.128.96.18]) by mx.google.com with ESMTP id s12si2540965edx.72.2020.04.22.07.22.42; Wed, 22 Apr 2020 07:23:17 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727800AbgDVOUH (ORCPT + 99 others); Wed, 22 Apr 2020 10:20:07 -0400 Received: from smtpout1.mo528.mail-out.ovh.net ([46.105.34.251]:55401 "EHLO smtpout1.mo528.mail-out.ovh.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726414AbgDVOUF (ORCPT ); Wed, 22 Apr 2020 10:20:05 -0400 X-Greylist: delayed 416 seconds by postgrey-1.27 at vger.kernel.org; Wed, 22 Apr 2020 10:20:03 EDT Received: from pro2.mail.ovh.net (unknown [10.108.16.139]) by mo528.mail-out.ovh.net (Postfix) with ESMTPS id 30F8E5A6DE69; Wed, 22 Apr 2020 16:13:06 +0200 (CEST) Received: from arch.lan (89.70.31.203) by DAG2EX1.emp2.local (172.16.2.11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1847.3; Wed, 22 Apr 2020 16:13:05 +0200 From: Tomasz Duszynski To: CC: , , , , Tomasz Duszynski Subject: [PATCH 1/6] iio: chemical: scd30: add core driver Date: Wed, 22 Apr 2020 16:11:30 +0200 Message-ID: <20200422141135.86419-2-tomasz.duszynski@octakon.com> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200422141135.86419-1-tomasz.duszynski@octakon.com> References: <20200422141135.86419-1-tomasz.duszynski@octakon.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [89.70.31.203] X-ClientProxiedBy: DAG3EX2.emp2.local (172.16.2.22) To DAG2EX1.emp2.local (172.16.2.11) X-Ovh-Tracer-Id: 5832724470897662999 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: 0 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeduhedrgeejgdeikecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfqggfjpdevjffgvefmvefgnecuuegrihhlohhuthemucehtddtnecunecujfgurhephffvufffkffojghfggfgtghisehtkeertdertddtnecuhfhrohhmpefvohhmrghsiicuffhushiihihnshhkihcuoehtohhmrghsiidrughushiihihnshhkihesohgtthgrkhhonhdrtghomheqnecukfhppedtrddtrddtrddtpdekledrjedtrdefuddrvddtfeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhhouggvpehsmhhtphdqohhuthdphhgvlhhopehprhhovddrmhgrihhlrdhovhhhrdhnvghtpdhinhgvtheptddrtddrtddrtddpmhgrihhlfhhrohhmpehtohhmrghsiidrughushiihihnshhkihesohgtthgrkhhonhdrtghomhdprhgtphhtthhopehjihgtvdefsehkvghrnhgvlhdrohhrgh Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add Sensirion SCD30 carbon dioxide core driver. Signed-off-by: Tomasz Duszynski --- drivers/iio/chemical/Kconfig | 11 + drivers/iio/chemical/Makefile | 1 + drivers/iio/chemical/scd30.h | 72 +++ drivers/iio/chemical/scd30_core.c | 796 ++++++++++++++++++++++++++++++ 4 files changed, 880 insertions(+) create mode 100644 drivers/iio/chemical/scd30.h create mode 100644 drivers/iio/chemical/scd30_core.c diff --git a/drivers/iio/chemical/Kconfig b/drivers/iio/chemical/Kconfig index 0b91de4df8f4..55f249333fa2 100644 --- a/drivers/iio/chemical/Kconfig +++ b/drivers/iio/chemical/Kconfig @@ -74,6 +74,17 @@ config PMS7003 To compile this driver as a module, choose M here: the module will be called pms7003. +config SCD30_CORE + tristate "SCD30 carbon dioxide sensor driver" + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + help + Say Y here to build support for the Sensirion SCD30 sensor with carbon + dioxide, relative humidity and temperature sensing capabilities. + + To compile this driver as a module, choose M here: the module will + be called scd30_core. + config SENSIRION_SGP30 tristate "Sensirion SGPxx gas sensors" depends on I2C diff --git a/drivers/iio/chemical/Makefile b/drivers/iio/chemical/Makefile index 33d3a595dda9..54abcb641262 100644 --- a/drivers/iio/chemical/Makefile +++ b/drivers/iio/chemical/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_BME680_SPI) += bme680_spi.o obj-$(CONFIG_CCS811) += ccs811.o obj-$(CONFIG_IAQCORE) += ams-iaq-core.o obj-$(CONFIG_PMS7003) += pms7003.o +obj-$(CONFIG_SCD30_CORE) += scd30_core.o obj-$(CONFIG_SENSIRION_SGP30) += sgp30.o obj-$(CONFIG_SPS30) += sps30.o obj-$(CONFIG_VZ89X) += vz89x.o diff --git a/drivers/iio/chemical/scd30.h b/drivers/iio/chemical/scd30.h new file mode 100644 index 000000000000..814782f5e71a --- /dev/null +++ b/drivers/iio/chemical/scd30.h @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _SCD30_H +#define _SCD30_H + +#include +#include +#include +#include +#include +#include +#include + +enum scd30_cmd { + /* start continuous measurement with pressure compensation */ + CMD_START_MEAS, + /* stop continuous measurement */ + CMD_STOP_MEAS, + /* set/get measurement interval */ + CMD_MEAS_INTERVAL, + /* check whether new measurement is ready */ + CMD_MEAS_READY, + /* get measurement */ + CMD_READ_MEAS, + /* turn on/off automatic self calibration */ + CMD_ASC, + /* set/get forced recalibration value */ + CMD_FRC, + /* set/get temperature offset */ + CMD_TEMP_OFFSET, + /* get firmware version */ + CMD_FW_VERSION, + /* reset sensor */ + CMD_RESET, + /* + * Command for altitude compensation was omitted intentionally because + * the same can be achieved by means of CMD_START_MEAS which takes + * pressure above the sea level as an argument. + */ +}; + +#define SCD30_MEAS_COUNT 3 + +struct scd30_state { + /* serialize access to the device */ + struct mutex lock; + struct device *dev; + struct regulator *vdd; + struct completion meas_ready; + void *priv; + int irq; + /* + * no way to retrieve current ambient pressure compensation value from + * the sensor so keep one around + */ + u16 pressure_comp; + u16 meas_interval; + int meas[SCD30_MEAS_COUNT]; + + int (*command)(struct scd30_state *state, enum scd30_cmd cmd, u16 arg, + char *rsp, int size); +}; + +int scd30_suspend(struct device *dev); +int scd30_resume(struct device *dev); + +static SIMPLE_DEV_PM_OPS(scd30_pm_ops, scd30_suspend, scd30_resume); + +int scd30_probe(struct device *dev, int irq, const char *name, void *priv, + int (*command)(struct scd30_state *state, enum scd30_cmd cmd, + u16 arg, char *rsp, int size)); + +#endif diff --git a/drivers/iio/chemical/scd30_core.c b/drivers/iio/chemical/scd30_core.c new file mode 100644 index 000000000000..4dc7e8f9a4f1 --- /dev/null +++ b/drivers/iio/chemical/scd30_core.c @@ -0,0 +1,796 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Sensirion SCD30 carbon dioxide sensor core driver + * + * Copyright (c) Tomasz Duszynski + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "scd30.h" + +/* pressure compensation in millibars */ +#define SCD30_PRESSURE_COMP_MIN 700 +#define SCD30_PRESSURE_COMP_MAX 1400 +#define SCD30_PRESSURE_COMP_DEFAULT 1013 +/* measurement interval in seconds */ +#define SCD30_MEAS_INTERVAL_MIN 2 +#define SCD30_MEAS_INTERVAL_MAX 1800 +#define SCD30_MEAS_INTERVAL_DEFAULT SCD30_MEAS_INTERVAL_MIN +/* reference CO2 concentration in ppm */ +#define SCD30_FRC_MIN 400 +#define SCD30_FRC_MAX 2000 + +enum { + CONC, + TEMP, + HR, +}; + +static int scd30_command(struct scd30_state *state, enum scd30_cmd cmd, u16 arg, + char *rsp, int size) +{ + int ret; + + ret = state->command(state, cmd, arg, rsp, size); + if (ret) + return ret; + + /* + * assumption holds that response buffer pointer has been already + * properly aligned so casts are safe + */ + while (size >= sizeof(u32)) { + *(u32 *)rsp = be32_to_cpup((__be32 *)rsp); + rsp += sizeof(u32); + size -= sizeof(u32); + } + + if (size) + *(u16 *)rsp = be16_to_cpup((__be16 *)rsp); + + return 0; +} + +static int scd30_reset(struct scd30_state *state) +{ + int ret; + u16 val; + + ret = scd30_command(state, CMD_RESET, 0, NULL, 0); + if (ret) + return ret; + + /* sensor boots up within 2 secs */ + msleep(2000); + /* + * Power-on-reset causes sensor to produce some glitch on i2c bus and + * some controllers end up in error state. Try to recover by placing + * any data on the bus. + */ + scd30_command(state, CMD_MEAS_READY, 0, (char *)&val, sizeof(val)); + + return 0; +} + +/* simplified float to fixed point conversion with a scaling factor of 0.01 */ +static int scd30_float_to_fp(int float32) +{ + int fraction, shift, + mantissa = float32 & GENMASK(22, 0), + sign = float32 & BIT(31) ? -1 : 1, + exp = (float32 & ~BIT(31)) >> 23; + + /* special case 0 */ + if (!exp && !mantissa) + return 0; + + exp -= 127; + if (exp < 0) { + exp = -exp; + /* return values ranging from 1 to 99 */ + return sign * ((((BIT(23) + mantissa) * 100) >> 23) >> exp); + } + + /* return values starting at 100 */ + shift = 23 - exp; + float32 = BIT(exp) + (mantissa >> shift); + fraction = mantissa & GENMASK(shift - 1, 0); + + return sign * (float32 * 100 + ((fraction * 100) >> shift)); +} + +static int scd30_read_meas(struct scd30_state *state) +{ + int i, ret; + + ret = scd30_command(state, CMD_READ_MEAS, 0, (char *)state->meas, + sizeof(state->meas)); + if (ret) + return ret; + + for (i = 0; i < ARRAY_SIZE(state->meas); i++) + state->meas[i] = scd30_float_to_fp(state->meas[i]); + + /* + * Accuracy within calibrated operating range is + * +-(30ppm + 3% measurement) so fractional part does + * not add real value. Moreover, ppm is an integer. + */ + state->meas[CONC] /= 100; + + return 0; +} + +static int scd30_wait_meas_irq(struct scd30_state *state) +{ + int ret, timeout = msecs_to_jiffies(state->meas_interval * 1250); + + reinit_completion(&state->meas_ready); + enable_irq(state->irq); + ret = wait_for_completion_interruptible_timeout(&state->meas_ready, + timeout); + if (ret > 0) + ret = 0; + else if (!ret) + ret = -ETIMEDOUT; + + disable_irq(state->irq); + + return ret; +} + +static int scd30_wait_meas_poll(struct scd30_state *state) +{ + int tries = 5; + + while (tries--) { + int ret; + u16 val; + + ret = scd30_command(state, CMD_MEAS_READY, 0, (char *)&val, + sizeof(val)); + if (ret) + return -EIO; + + /* new measurement available */ + if (val) + break; + + msleep_interruptible(state->meas_interval * 250); + } + + if (tries == -1) + return -ETIMEDOUT; + + return 0; +} + +static int scd30_read_poll(struct scd30_state *state) +{ + int ret; + + ret = scd30_wait_meas_poll(state); + if (ret) + return ret; + + return scd30_read_meas(state); +} + +static int scd30_read(struct scd30_state *state) +{ + if (state->irq > 0) + return scd30_wait_meas_irq(state); + + return scd30_read_poll(state); +} + +static int scd30_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct scd30_state *state = iio_priv(indio_dev); + int ret, meas[SCD30_MEAS_COUNT]; + + switch (mask) { + case IIO_CHAN_INFO_PROCESSED: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + mutex_lock(&state->lock); + ret = scd30_read(state); + memcpy(meas, state->meas, sizeof(meas)); + mutex_unlock(&state->lock); + iio_device_release_direct_mode(indio_dev); + if (ret) + return ret; + + switch (chan->type) { + case IIO_CONCENTRATION: + *val = meas[chan->address] / 10000; + *val2 = (meas[chan->address] % 10000) * 100; + return IIO_VAL_INT_PLUS_MICRO; + case IIO_TEMP: + case IIO_HUMIDITYRELATIVE: + *val = meas[chan->address] * 10; + return IIO_VAL_INT; + default: + return -EINVAL; + } + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_CONCENTRATION: + *val = 0; + *val2 = 100; + return IIO_VAL_INT_PLUS_MICRO; + case IIO_TEMP: + case IIO_HUMIDITYRELATIVE: + *val = 10; + return IIO_VAL_INT; + default: + return -EINVAL; + } + } + + return -EINVAL; +} + +static ssize_t pressure_comp_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + + mutex_lock(&state->lock); + ret = sprintf(buf, "%d\n", state->pressure_comp); + mutex_unlock(&state->lock); + + return ret; +} + +static ssize_t pressure_comp_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + u16 val; + + if (kstrtou16(buf, 0, &val)) + return -EINVAL; + + if ((val < SCD30_PRESSURE_COMP_MIN) || (val > SCD30_PRESSURE_COMP_MAX)) + return -EINVAL; + + mutex_lock(&state->lock); + ret = scd30_command(state, CMD_START_MEAS, val, NULL, 0); + if (ret) + goto out; + + state->pressure_comp = val; +out: + mutex_unlock(&state->lock); + + return ret ?: len; +} + +static ssize_t pressure_comp_available_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "[%d %d %d]\n", SCD30_PRESSURE_COMP_MIN, 1, + SCD30_PRESSURE_COMP_MAX); +} + +static ssize_t meas_interval_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + u16 val; + + mutex_lock(&state->lock); + ret = scd30_command(state, CMD_MEAS_INTERVAL, 0, (char *)&val, + sizeof(val)); + mutex_unlock(&state->lock); + + return ret ?: sprintf(buf, "%d\n", val); +} + +static ssize_t meas_interval_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + u16 val; + + if (kstrtou16(buf, 0, &val)) + return -EINVAL; + + if ((val < SCD30_MEAS_INTERVAL_MIN) || (val > SCD30_MEAS_INTERVAL_MAX)) + return -EINVAL; + + mutex_lock(&state->lock); + ret = scd30_command(state, CMD_MEAS_INTERVAL, val, NULL, 0); + if (ret) + goto out; + + state->meas_interval = val; +out: + mutex_unlock(&state->lock); + + return ret ?: len; +} + +static ssize_t meas_interval_available_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "[%d %d %d]\n", SCD30_MEAS_INTERVAL_MIN, 1, + SCD30_MEAS_INTERVAL_MAX); +} + +static ssize_t asc_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + u16 val; + + mutex_lock(&state->lock); + ret = scd30_command(state, CMD_ASC, 0, (char *)&val, sizeof(val)); + mutex_unlock(&state->lock); + + return ret ?: sprintf(buf, "%d\n", val); +} + +static ssize_t asc_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + u16 val; + + if (kstrtou16(buf, 0, &val)) + return -EINVAL; + + val = !!val; + mutex_lock(&state->lock); + ret = scd30_command(state, CMD_ASC, val, NULL, 0); + mutex_unlock(&state->lock); + + return ret ?: len; +} + +static ssize_t frc_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + u16 val; + int ret; + + mutex_lock(&state->lock); + ret = scd30_command(state, CMD_FRC, 0, (char *)&val, sizeof(val)); + mutex_unlock(&state->lock); + + return ret ?: sprintf(buf, "%d\n", val); +} + +static ssize_t frc_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + u16 val; + + if (kstrtou16(buf, 0, &val)) + return -EINVAL; + + if ((val < SCD30_FRC_MIN) || (val > SCD30_FRC_MAX)) + return -EINVAL; + + mutex_lock(&state->lock); + ret = scd30_command(state, CMD_FRC, val, NULL, 0); + mutex_unlock(&state->lock); + + return ret ?: len; +} + +static ssize_t frc_available_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "[%d %d %d]\n", SCD30_FRC_MIN, 1, SCD30_FRC_MAX); +} + +static ssize_t temp_offset_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + u16 val; + + mutex_lock(&state->lock); + ret = scd30_command(state, CMD_TEMP_OFFSET, 0, (char *)&val, + sizeof(val)); + mutex_unlock(&state->lock); + + return ret ?: sprintf(buf, "%d\n", val); +} + +static ssize_t temp_offset_store(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + u16 val; + + if (kstrtou16(buf, 0, &val)) + return -EINVAL; + + /* + * Manufacturer does not explicitly specify min/max sensible values + * hence check is omitted for simplicity. + */ + mutex_lock(&state->lock); + ret = scd30_command(state, CMD_TEMP_OFFSET, val, NULL, 0); + mutex_unlock(&state->lock); + + return ret ?: len; +} + +static ssize_t reset_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + + mutex_lock(&state->lock); + /* after reset previous sensor state will be restored automatically */ + ret = scd30_reset(state); + mutex_unlock(&state->lock); + + return ret ?: len; +} + +static IIO_DEVICE_ATTR_RW(pressure_comp, 0); +static IIO_DEVICE_ATTR_RO(pressure_comp_available, 0); +static IIO_DEVICE_ATTR_RW(meas_interval, 0); +static IIO_DEVICE_ATTR_RO(meas_interval_available, 0); +static IIO_DEVICE_ATTR_RW(asc, 0); +static IIO_DEVICE_ATTR_RW(frc, 0); +static IIO_DEVICE_ATTR_RO(frc_available, 0); +static IIO_DEVICE_ATTR_RW(temp_offset, 0); +static IIO_CONST_ATTR(temp_offset_available, "[0 1 65535]"); +static IIO_DEVICE_ATTR_WO(reset, 0); + +static struct attribute *scd30_attrs[] = { + &iio_dev_attr_pressure_comp.dev_attr.attr, + &iio_dev_attr_pressure_comp_available.dev_attr.attr, + &iio_dev_attr_meas_interval.dev_attr.attr, + &iio_dev_attr_meas_interval_available.dev_attr.attr, + &iio_dev_attr_asc.dev_attr.attr, + &iio_dev_attr_frc.dev_attr.attr, + &iio_dev_attr_frc_available.dev_attr.attr, + &iio_dev_attr_temp_offset.dev_attr.attr, + &iio_const_attr_temp_offset_available.dev_attr.attr, + &iio_dev_attr_reset.dev_attr.attr, + NULL +}; + +static const struct attribute_group scd30_attr_group = { + .attrs = scd30_attrs, +}; + +static const struct iio_info scd30_info = { + .attrs = &scd30_attr_group, + .read_raw = scd30_read_raw, +}; + +#define SCD30_CHAN(_type, _index) \ + .type = _type, \ + .address = _index, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .scan_index = _index + +#define SCD30_CHAN_SCAN_TYPE(_sign, _realbits) .scan_type = { \ + .sign = _sign, \ + .realbits = _realbits, \ + .storagebits = 32, \ + .endianness = IIO_CPU, \ +} + +static const struct iio_chan_spec scd30_channels[] = { + { + SCD30_CHAN(IIO_CONCENTRATION, CONC), + SCD30_CHAN_SCAN_TYPE('u', 16), + }, + { + SCD30_CHAN(IIO_TEMP, TEMP), + SCD30_CHAN_SCAN_TYPE('s', 14), + }, + { + SCD30_CHAN(IIO_HUMIDITYRELATIVE, HR), + SCD30_CHAN_SCAN_TYPE('u', 14), + }, + IIO_CHAN_SOFT_TIMESTAMP(3), +}; + +int __maybe_unused scd30_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + + ret = scd30_command(state, CMD_STOP_MEAS, 0, NULL, 0); + if (ret) + return ret; + + return regulator_disable(state->vdd); +} +EXPORT_SYMBOL(scd30_suspend); + +int __maybe_unused scd30_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct scd30_state *state = iio_priv(indio_dev); + int ret; + + ret = regulator_enable(state->vdd); + if (ret) + return ret; + + return scd30_command(state, CMD_START_MEAS, state->pressure_comp, + NULL, 0); +} +EXPORT_SYMBOL(scd30_resume); + +static void scd30_exit(void *data) +{ + struct scd30_state *state = data; + + scd30_command(state, CMD_STOP_MEAS, 0, NULL, 0); + regulator_disable(state->vdd); +} + +static irqreturn_t scd30_irq_handler(int irq, void *priv) +{ + struct iio_dev *indio_dev = priv; + + if (iio_buffer_enabled(indio_dev)) { + iio_trigger_poll(indio_dev->trig); + + return IRQ_HANDLED; + } + + return IRQ_WAKE_THREAD; +} + +static irqreturn_t scd30_irq_thread_handler(int irq, void *priv) +{ + struct iio_dev *indio_dev = priv; + struct scd30_state *state = iio_priv(indio_dev); + int ret; + + ret = scd30_read_meas(state); + if (ret) + goto out; + + complete_all(&state->meas_ready); +out: + return IRQ_HANDLED; +} + +static irqreturn_t scd30_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct scd30_state *state = iio_priv(indio_dev); + /* co2 concentration, temperature, rh, padding, timestamp */ + int data[SCD30_MEAS_COUNT + 1 + 2], ret = 0; + + mutex_lock(&state->lock); + if (!iio_trigger_using_own(indio_dev)) + ret = scd30_read_poll(state); + else + ret = scd30_read_meas(state); + memcpy(data, state->meas, sizeof(state->meas)); + mutex_unlock(&state->lock); + if (ret) + goto out; + + iio_push_to_buffers_with_timestamp(indio_dev, data, + iio_get_time_ns(indio_dev)); +out: + iio_trigger_notify_done(indio_dev->trig); + return IRQ_HANDLED; +} + +static int scd30_set_trigger_state(struct iio_trigger *trig, bool state) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + struct scd30_state *st = iio_priv(indio_dev); + + if (state) + enable_irq(st->irq); + else + disable_irq(st->irq); + + return 0; +} + +static const struct iio_trigger_ops scd30_trigger_ops = { + .set_trigger_state = scd30_set_trigger_state, +}; + +static int scd30_setup_trigger(struct iio_dev *indio_dev) +{ + struct scd30_state *state = iio_priv(indio_dev); + struct device *dev = indio_dev->dev.parent; + struct iio_trigger *trig; + int ret; + + trig = devm_iio_trigger_alloc(dev, "%s-dev%d", indio_dev->name, + indio_dev->id); + if (!trig) { + dev_err(dev, "failed to allocate trigger\n"); + return -ENOMEM; + } + + trig->dev.parent = dev; + trig->ops = &scd30_trigger_ops; + iio_trigger_set_drvdata(trig, indio_dev); + + ret = devm_iio_trigger_register(dev, trig); + if (ret) + return ret; + + indio_dev->trig = iio_trigger_get(trig); + + ret = devm_request_threaded_irq(dev, state->irq, scd30_irq_handler, + scd30_irq_thread_handler, + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, + indio_dev->name, indio_dev); + if (ret) + dev_err(dev, "failed to request irq\n"); + + disable_irq(state->irq); + + return ret; +} + +int scd30_probe(struct device *dev, int irq, const char *name, void *priv, + int (*command)(struct scd30_state *state, enum scd30_cmd cmd, + u16 arg, char *rsp, int size)) +{ + static const unsigned long scd30_scan_masks[] = { 0x07, 0x00 }; + struct scd30_state *state; + struct iio_dev *indio_dev; + int ret; + u16 val; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*state)); + if (!indio_dev) + return -ENOMEM; + + dev_set_drvdata(dev, indio_dev); + + state = iio_priv(indio_dev); + state->dev = dev; + state->priv = priv; + state->irq = irq; + state->pressure_comp = SCD30_PRESSURE_COMP_DEFAULT; + state->meas_interval = SCD30_MEAS_INTERVAL_DEFAULT; + state->command = command; + mutex_init(&state->lock); + init_completion(&state->meas_ready); + + indio_dev->dev.parent = dev; + indio_dev->info = &scd30_info; + indio_dev->name = name; + indio_dev->channels = scd30_channels; + indio_dev->num_channels = ARRAY_SIZE(scd30_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->available_scan_masks = scd30_scan_masks; + + state->vdd = devm_regulator_get(dev, "vdd"); + if (IS_ERR(state->vdd)) { + dev_err(dev, "failed to get vdd regulator\n"); + return PTR_ERR(state->vdd); + } + + ret = regulator_enable(state->vdd); + if (ret) { + dev_err(dev, "failed to enable vdd regulator\n"); + return ret; + } + + ret = devm_add_action_or_reset(dev, scd30_exit, state); + if (ret) + return ret; + + ret = scd30_reset(state); + if (ret) { + dev_err(dev, "failed to reset device: %d\n", ret); + return ret; + } + + if (state->irq > 0) { + ret = scd30_setup_trigger(indio_dev); + if (ret) { + dev_err(dev, "failed to setup trigger: %d\n", ret); + return ret; + } + } + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, + scd30_trigger_handler, NULL); + if (ret) + return ret; + + ret = scd30_command(state, CMD_FW_VERSION, 0, (char *)&val, + sizeof(val)); + if (ret) { + dev_err(dev, "failed to read firmware version: %d\n", ret); + return ret; + } + dev_info(dev, "firmware version: %d.%d\n", val >> 8, (char)val); + + ret = scd30_command(state, CMD_MEAS_INTERVAL, state->meas_interval, + NULL, 0); + if (ret) { + dev_err(dev, "failed to set measurement interval: %d\n", ret); + return ret; + } + + ret = scd30_command(state, CMD_START_MEAS, state->pressure_comp, + NULL, 0); + if (ret) { + dev_err(dev, "failed to start measurement: %d\n", ret); + return ret; + } + + return devm_iio_device_register(dev, indio_dev); +} +EXPORT_SYMBOL(scd30_probe); + +MODULE_AUTHOR("Tomasz Duszynski "); +MODULE_DESCRIPTION("Sensirion SCD30 carbon dioxide sensor core driver"); +MODULE_LICENSE("GPL v2"); -- 2.26.1