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[23.128.96.18]) by mx.google.com with ESMTP id 33si12018121pgq.48.2021.05.02.12.56.48; Sun, 02 May 2021 12:57:01 -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 S232498AbhEBTzW (ORCPT + 99 others); Sun, 2 May 2021 15:55:22 -0400 Received: from smtpout1.mo528.mail-out.ovh.net ([46.105.34.251]:51785 "EHLO smtpout1.mo528.mail-out.ovh.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231909AbhEBTzW (ORCPT ); Sun, 2 May 2021 15:55:22 -0400 Received: from pro2.mail.ovh.net (unknown [10.109.143.59]) by mo528.mail-out.ovh.net (Postfix) with ESMTPS id BE5D6A3B843D; Sun, 2 May 2021 21:54:28 +0200 (CEST) Received: from localhost (89.70.221.198) 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 15.1.2242.4; Sun, 2 May 2021 21:54:28 +0200 Date: Sun, 2 May 2021 21:50:15 +0200 From: Tomasz Duszynski To: Jonathan Cameron CC: Tomasz Duszynski , , , , , Subject: Re: [PATCH v2 2/3] iio: sps30: add support for serial interface Message-ID: References: <20210502134431.42647-1-tomasz.duszynski@octakon.com> <20210502134431.42647-3-tomasz.duszynski@octakon.com> <20210502183822.1dec23cc@jic23-huawei> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline In-Reply-To: <20210502183822.1dec23cc@jic23-huawei> X-Originating-IP: [89.70.221.198] X-ClientProxiedBy: DAG4EX2.emp2.local (172.16.2.32) To DAG2EX1.emp2.local (172.16.2.11) X-Ovh-Tracer-Id: 248823881441893458 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: 0 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeduledrvdefvddghedtucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucenucfjughrpeffhffvuffkfhggtggujghisehttdertddttdejnecuhfhrohhmpefvohhmrghsiicuffhushiihihnshhkihcuoehtohhmrghsiidrughushiihihnshhkihesohgtthgrkhhonhdrtghomheqnecuggftrfgrthhtvghrnheptdehveethfffudetjeeftdekueehjeegjedvteffgfevkefffeegffeugeehgfejnecukfhppedtrddtrddtrddtpdekledrjedtrddvvddurdduleeknecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmohguvgepshhmthhpqdhouhhtpdhhvghlohepphhrohdvrdhmrghilhdrohhvhhdrnhgvthdpihhnvghtpedtrddtrddtrddtpdhmrghilhhfrhhomhepthhomhgrshiirdguuhhsiiihnhhskhhisehotghtrghkohhnrdgtohhmpdhrtghpthhtoheprhhosghhodgutheskhgvrhhnvghlrdhorhhg Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, May 02, 2021 at 06:38:22PM +0100, Jonathan Cameron wrote: > On Sun, 2 May 2021 15:44:30 +0200 > Tomasz Duszynski wrote: > > > Sensor has support for both i2c and serial communication interfaces. > > Both offer very similar set of features. Minor differences don't impact > > overall functionality like doing measurements, etc. > > > > Support for i2c have already been added, this patch adds support > > for the latter ie. serial interface. > > > > Signed-off-by: Tomasz Duszynski > Two trivial comments inline. I'm happy to tidy those up whilst applying if > everyone else is happy with this and you don't need to do a v3. Actually I don't mind pushing v3 with proposed changes. In the meantime I'll add one extra check related to retrieving serial number. > > Thanks, > > Jonathan > > > --- > > MAINTAINERS | 1 + > > drivers/iio/chemical/Kconfig | 11 + > > drivers/iio/chemical/Makefile | 1 + > > drivers/iio/chemical/sps30_serial.c | 428 ++++++++++++++++++++++++++++ > > 4 files changed, 441 insertions(+) > > create mode 100644 drivers/iio/chemical/sps30_serial.c > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > index 4b39a9c48736..cab9a63ad2cf 100644 > > --- a/MAINTAINERS > > +++ b/MAINTAINERS > > @@ -16138,6 +16138,7 @@ S: Maintained > > F: Documentation/devicetree/bindings/iio/chemical/sensirion,sps30.yaml > > F: drivers/iio/chemical/sps30.c > > F: drivers/iio/chemical/sps30_i2c.c > > +F: drivers/iio/chemical/sps30_serial.c > > > > SERIAL DEVICE BUS > > M: Rob Herring > > diff --git a/drivers/iio/chemical/Kconfig b/drivers/iio/chemical/Kconfig > > index 2b45a76ab7bc..a4920646e9be 100644 > > --- a/drivers/iio/chemical/Kconfig > > +++ b/drivers/iio/chemical/Kconfig > > @@ -148,6 +148,17 @@ config SPS30_I2C > > To compile this driver as a module, choose M here: the module will > > be called sps30_i2c. > > > > +config SPS30_SERIAL > > + tristate "SPS30 particulate matter sensor serial driver" > > + depends on SERIAL_DEV_BUS > > + select SPS30 > > + help > > + Say Y here to build support for the Sensirion SPS30 serial interface > > + driver. > > + > > + To compile this driver as a module, choose M here: the module will > > + be called sps30_serial. > > + > > config VZ89X > > tristate "SGX Sensortech MiCS VZ89X VOC sensor" > > depends on I2C > > diff --git a/drivers/iio/chemical/Makefile b/drivers/iio/chemical/Makefile > > index 41c264a229c0..4898690cc155 100644 > > --- a/drivers/iio/chemical/Makefile > > +++ b/drivers/iio/chemical/Makefile > > @@ -18,4 +18,5 @@ obj-$(CONFIG_SCD30_SERIAL) += scd30_serial.o > > obj-$(CONFIG_SENSIRION_SGP30) += sgp30.o > > obj-$(CONFIG_SPS30) += sps30.o > > obj-$(CONFIG_SPS30_I2C) += sps30_i2c.o > > +obj-$(CONFIG_SPS30_SERIAL) += sps30_serial.o > > obj-$(CONFIG_VZ89X) += vz89x.o > > diff --git a/drivers/iio/chemical/sps30_serial.c b/drivers/iio/chemical/sps30_serial.c > > new file mode 100644 > > index 000000000000..3dc1a9e2ae82 > > --- /dev/null > > +++ b/drivers/iio/chemical/sps30_serial.c > > @@ -0,0 +1,428 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Sensirion SPS30 particulate matter sensor serial driver > > + * > > + * Copyright (c) 2021 Tomasz Duszynski > > + */ > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#include "sps30.h" > > + > > +#define SPS30_SERIAL_DEV_NAME "sps30" > > + > > +#define SPS30_SERIAL_SOF_EOF 0x7e > > +#define SPS30_SERIAL_TIMEOUT msecs_to_jiffies(20) > > +#define SPS30_SERIAL_MAX_BUF_SIZE 263 > > +#define SPS30_SERIAL_ESCAPE_CHAR 0x7d > > + > > +#define SPS30_SERIAL_FRAME_MIN_SIZE 7 > > +#define SPS30_SERIAL_FRAME_ADR_OFFSET 1 > > +#define SPS30_SERIAL_FRAME_CMD_OFFSET 2 > > +#define SPS30_SERIAL_FRAME_MOSI_LEN_OFFSET 3 > > +#define SPS30_SERIAL_FRAME_MISO_STATE_OFFSET 3 > > +#define SPS30_SERIAL_FRAME_MISO_LEN_OFFSET 4 > > +#define SPS30_SERIAL_FRAME_MISO_DATA_OFFSET 5 > > + > > +#define SPS30_SERIAL_START_MEAS 0x00 > > +#define SPS30_SERIAL_STOP_MEAS 0x01 > > +#define SPS30_SERIAL_READ_MEAS 0x03 > > +#define SPS30_SERIAL_RESET 0xd3 > > +#define SPS30_SERIAL_CLEAN_FAN 0x56 > > +#define SPS30_SERIAL_PERIOD 0x80 > > +#define SPS30_SERIAL_DEV_INFO 0xd0 > > +#define SPS30_SERIAL_READ_VERSION 0xd1 > > + > > +struct sps30_serial_priv { > > + struct completion new_frame; > > + unsigned char buf[SPS30_SERIAL_MAX_BUF_SIZE]; > > + size_t num; > > + bool escaped; > > + bool done; > > +}; > > + > > +static int sps30_serial_xfer(struct sps30_state *state, const unsigned char *buf, size_t size) > > +{ > > + struct serdev_device *serdev = to_serdev_device(state->dev); > > + struct sps30_serial_priv *priv = state->priv; > > + int ret; > > + > > + priv->num = 0; > > + priv->escaped = false; > > + priv->done = false; > > + > > + ret = serdev_device_write(serdev, buf, size, SPS30_SERIAL_TIMEOUT); > > + if (ret < 0) > > + return ret; > > + if (ret != size) > > + return -EIO; > > + > > + ret = wait_for_completion_interruptible_timeout(&priv->new_frame, SPS30_SERIAL_TIMEOUT); > > + if (ret < 0) > > + return ret; > > + if (!ret) > > + return -ETIMEDOUT; > > + > > + return 0; > > +} > > + > > +static struct { > > + unsigned char byte; > > + unsigned char byte2; > > +} sps30_serial_bytes[] = { > > + { 0x11, 0x31 }, > > + { 0x13, 0x33 }, > > + { 0x7e, 0x5e }, > > + { 0x7d, 0x5d }, > > +}; > > const? > > > + > > +static int sps30_serial_put_byte(unsigned char *buf, unsigned char byte) > > +{ > > + int i; > > + > > + for (i = 0; i < ARRAY_SIZE(sps30_serial_bytes); i++) { > > + if (sps30_serial_bytes[i].byte != byte) > > + continue; > > + > > + buf[0] = SPS30_SERIAL_ESCAPE_CHAR; > > + buf[1] = sps30_serial_bytes[i].byte2; > > + > > + return 2; > > + } > > + > > + buf[0] = byte; > > + > > + return 1; > > +} > > + > > +static char sps30_serial_get_byte(bool escaped, unsigned char byte2) > > +{ > > + int i; > > + > > + if (!escaped) > > + return byte2; > > + > > + for (i = 0; i < ARRAY_SIZE(sps30_serial_bytes); i++) { > > + if (sps30_serial_bytes[i].byte2 != byte2) > > + continue; > > + > > + return sps30_serial_bytes[i].byte; > > + } > > + > > + return 0; > > +} > > + > > +static unsigned char sps30_serial_calc_chksum(const unsigned char *buf, size_t num) > > +{ > > + unsigned int chksum = 0; > > + size_t i; > > + > > + for (i = 0; i < num; i++) > > + chksum += buf[i]; > > + > > + return ~chksum; > > +} > > + > > +static int sps30_serial_prep_frame(unsigned char *buf, unsigned char cmd, > > + const unsigned char *arg, size_t arg_size) > > +{ > > + unsigned char chksum; > > + int num = 0; > > + size_t i; > > + > > + buf[num++] = SPS30_SERIAL_SOF_EOF; > > + buf[num++] = 0; > > + num += sps30_serial_put_byte(buf + num, cmd); > > + num += sps30_serial_put_byte(buf + num, arg_size); > > + > > + for (i = 0; i < arg_size; i++) > > + num += sps30_serial_put_byte(buf + num, arg[i]); > > + > > + /* SOF isn't checksummed */ > > + chksum = sps30_serial_calc_chksum(buf + 1, num - 1); > > + num += sps30_serial_put_byte(buf + num, chksum); > > + buf[num++] = SPS30_SERIAL_SOF_EOF; > > + > > + return num; > > +} > > + > > +static bool sps30_serial_frame_valid(struct sps30_state *state, const unsigned char *buf) > > +{ > > + struct sps30_serial_priv *priv = state->priv; > > + unsigned char chksum; > > + > > + if ((priv->num < SPS30_SERIAL_FRAME_MIN_SIZE) || > > + (priv->num != SPS30_SERIAL_FRAME_MIN_SIZE + > > + priv->buf[SPS30_SERIAL_FRAME_MISO_LEN_OFFSET])) { > > + dev_err(state->dev, "frame has invalid number of bytes\n"); > > + return false; > > + } > > + > > + if ((priv->buf[SPS30_SERIAL_FRAME_ADR_OFFSET] != buf[SPS30_SERIAL_FRAME_ADR_OFFSET]) || > > + (priv->buf[SPS30_SERIAL_FRAME_CMD_OFFSET] != buf[SPS30_SERIAL_FRAME_CMD_OFFSET])) { > > + dev_err(state->dev, "frame has wrong ADR and CMD bytes\n"); > > + return false; > > + } > > + > > + if (priv->buf[SPS30_SERIAL_FRAME_MISO_STATE_OFFSET]) { > > + dev_err(state->dev, "frame with non-zero state received (0x%02x)\n", > > + priv->buf[SPS30_SERIAL_FRAME_MISO_STATE_OFFSET]); > > + return false; > > + } > > + > > + /* SOF, checksum and EOF are not checksummed */ > > + chksum = sps30_serial_calc_chksum(priv->buf + 1, priv->num - 3); > > + if (priv->buf[priv->num - 2] != chksum) { > > + dev_err(state->dev, "frame integrity check failed\n"); > > + return false; > > + } > > + > > + return true; > > +} > > + > > +static int sps30_serial_command(struct sps30_state *state, unsigned char cmd, > > + const void *arg, size_t arg_size, void *rsp, size_t rsp_size) > > +{ > > + struct sps30_serial_priv *priv = state->priv; > > + unsigned char buf[SPS30_SERIAL_MAX_BUF_SIZE]; > > + int ret, size; > > + > > + size = sps30_serial_prep_frame(buf, cmd, arg, arg_size); > > + ret = sps30_serial_xfer(state, buf, size); > > + if (ret) > > + return ret; > > + > > + if (!sps30_serial_frame_valid(state, buf)) > > + return -EIO; > > + > > + if (rsp) { > > + rsp_size = min_t(size_t, priv->buf[SPS30_SERIAL_FRAME_MISO_LEN_OFFSET], rsp_size); > > + memcpy(rsp, &priv->buf[SPS30_SERIAL_FRAME_MISO_DATA_OFFSET], rsp_size); > > + } > > + > > + return rsp_size; > > +} > > + > > +static int sps30_serial_receive_buf(struct serdev_device *serdev, > > + const unsigned char *buf, size_t size) > > +{ > > + struct iio_dev *indio_dev = dev_get_drvdata(&serdev->dev); > > + struct sps30_serial_priv *priv; > > + struct sps30_state *state; > > + unsigned char byte; > > + size_t i; > > + > > + if (!indio_dev) > > + return 0; > > + > > + state = iio_priv(indio_dev); > > + priv = state->priv; > > + > > + /* just in case device put some unexpected data on the bus */ > > + if (priv->done) > > + return size; > > + > > + /* wait for the start of frame */ > > + if (!priv->num && size && buf[0] != SPS30_SERIAL_SOF_EOF) > > + return 1; > > + > > + if (priv->num + size >= ARRAY_SIZE(priv->buf)) > > + size = ARRAY_SIZE(priv->buf) - priv->num; > > + > > + for (i = 0; i < size; i++) { > > + byte = buf[i]; > > + /* remove stuffed bytes on-the-fly */ > > + if (byte == SPS30_SERIAL_ESCAPE_CHAR) { > > + priv->escaped = true; > > + continue; > > + } > > + > > + byte = sps30_serial_get_byte(priv->escaped, byte); > > + if (priv->escaped && !byte) > > + dev_warn(state->dev, "unrecognized escaped char (0x%02x)\n", byte); > > + > > + priv->buf[priv->num++] = byte; > > + > > + /* EOF received */ > > + if (!priv->escaped && byte == SPS30_SERIAL_SOF_EOF) { > > + if (priv->num < SPS30_SERIAL_FRAME_MIN_SIZE) > > + continue; > > + > > + priv->done = true; > > + complete(&priv->new_frame); > > + i++; > > + break; > > + } > > + > > + priv->escaped = false; > > + } > > + > > + return i; > > +} > > + > > +static const struct serdev_device_ops sps30_serial_device_ops = { > > + .receive_buf = sps30_serial_receive_buf, > > + .write_wakeup = serdev_device_write_wakeup, > > +}; > > + > > +static int sps30_serial_start_meas(struct sps30_state *state) > > +{ > > + /* request BE IEEE754 formatted data */ > > + unsigned char buf[] = { 0x01, 0x03 }; > > + > > + return sps30_serial_command(state, SPS30_SERIAL_START_MEAS, buf, sizeof(buf), NULL, 0); > > +} > > + > > +static int sps30_serial_stop_meas(struct sps30_state *state) > > +{ > > + return sps30_serial_command(state, SPS30_SERIAL_STOP_MEAS, NULL, 0, NULL, 0); > > +} > > + > > +static int sps30_serial_reset(struct sps30_state *state) > > +{ > > + int ret; > > + > > + ret = sps30_serial_command(state, SPS30_SERIAL_RESET, NULL, 0, NULL, 0); > > + msleep(500); > > + > > + return ret; > > +} > > + > > +static int sps30_serial_read_meas(struct sps30_state *state, __be32 *meas, size_t num) > > +{ > > + int ret; > > + > > + /* measurements are ready within a second */ > > + if (msleep_interruptible(1000)) > > + return -EINTR; > > + > > + ret = sps30_serial_command(state, SPS30_SERIAL_READ_MEAS, NULL, 0, meas, num * sizeof(num)); > > + if (ret < 0) > > + return ret; > > + /* if measurements aren't ready sensor returns empty frame */ > > + if (ret == SPS30_SERIAL_FRAME_MIN_SIZE) > > + return -ETIMEDOUT; > > + if (ret != num * sizeof(*meas)) > > + return -EIO; > > + > > + return 0; > > +} > > + > > +static int sps30_serial_clean_fan(struct sps30_state *state) > > +{ > > + return sps30_serial_command(state, SPS30_SERIAL_CLEAN_FAN, NULL, 0, NULL, 0); > > +} > > + > > +static int sps30_serial_read_cleaning_period(struct sps30_state *state, __be32 *period) > > +{ > > + unsigned char buf[] = { 0x00 }; > > + int ret; > > + > > + ret = sps30_serial_command(state, SPS30_SERIAL_PERIOD, buf, sizeof(buf), > > + period, sizeof(*period)); > > + if (ret < 0) > > + return ret; > > + if (ret != sizeof(*period)) > > + return -EIO; > > + > > + return 0; > > +} > > + > > +static int sps30_serial_write_cleaning_period(struct sps30_state *state, __be32 period) > > +{ > > + unsigned char buf[5] = { 0x00 }; > > + > > + memcpy(buf + 1, &period, sizeof(period)); > > + > > + return sps30_serial_command(state, SPS30_SERIAL_PERIOD, buf, sizeof(buf), NULL, 0); > > +} > > + > > +static int sps30_serial_show_info(struct sps30_state *state) > > +{ > > + /* extra nul byte just in case serial number isn't a valid string */ > > + unsigned char buf[32 + 1] = { 0x00 }; > > + struct device *dev = state->dev; > > + int ret; > > + > > + /* tell device to return serial number */ > > + buf[0] = 0x03; > > Bit odd when you just set it to 0 above. Maybe just set > unsigned char buf[32 + 1] = { 0x03 }; and combine the comments? > > If everything else is fine, I can do that whilst applying. > > > + ret = sps30_serial_command(state, SPS30_SERIAL_DEV_INFO, buf, 1, buf, sizeof(buf) - 1); > > + if (ret < 0) > > + return ret; > > + > > + dev_info(dev, "serial number: %s\n", buf); > > + > > + ret = sps30_serial_command(state, SPS30_SERIAL_READ_VERSION, NULL, 0, buf, sizeof(buf) - 1); > > + if (ret < 0) > > + return ret; > > + if (ret < 2) > > + return -EIO; > > + > > + dev_info(dev, "fw version: %u.%u\n", buf[0], buf[1]); > > + > > + return 0; > > +} > > + > > +static const struct sps30_ops sps30_serial_ops = { > > + .start_meas = sps30_serial_start_meas, > > + .stop_meas = sps30_serial_stop_meas, > > + .read_meas = sps30_serial_read_meas, > > + .reset = sps30_serial_reset, > > + .clean_fan = sps30_serial_clean_fan, > > + .read_cleaning_period = sps30_serial_read_cleaning_period, > > + .write_cleaning_period = sps30_serial_write_cleaning_period, > > + .show_info = sps30_serial_show_info, > > +}; > > + > > +static int sps30_serial_probe(struct serdev_device *serdev) > > +{ > > + struct device *dev = &serdev->dev; > > + struct sps30_serial_priv *priv; > > + int ret; > > + > > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > > + if (!priv) > > + return -ENOMEM; > > + > > + init_completion(&priv->new_frame); > > + serdev_device_set_client_ops(serdev, &sps30_serial_device_ops); > > + > > + ret = devm_serdev_device_open(dev, serdev); > > + if (ret) > > + return ret; > > + > > + serdev_device_set_baudrate(serdev, 115200); > > + serdev_device_set_flow_control(serdev, false); > > + > > + ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE); > > + if (ret) > > + return ret; > > + > > + return sps30_probe(dev, SPS30_SERIAL_DEV_NAME, priv, &sps30_serial_ops); > > +} > > + > > +static const struct of_device_id sps30_serial_of_match[] = { > > + { .compatible = "sensirion,sps30" }, > > + { } > > +}; > > +MODULE_DEVICE_TABLE(of, sps30_serial_of_match); > > + > > +static struct serdev_device_driver sps30_serial_driver = { > > + .driver = { > > + .name = KBUILD_MODNAME, > > + .of_match_table = sps30_serial_of_match, > > + }, > > + .probe = sps30_serial_probe, > > +}; > > +module_serdev_device_driver(sps30_serial_driver); > > + > > +MODULE_AUTHOR("Tomasz Duszynski "); > > +MODULE_DESCRIPTION("Sensirion SPS30 particulate matter sensor serial driver"); > > +MODULE_LICENSE("GPL v2"); >