From patchwork Tue May 21 02:13:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eddie James X-Patchwork-Id: 10952833 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 67573912 for ; Tue, 21 May 2019 02:13:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 554BC28901 for ; Tue, 21 May 2019 02:13:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 498442890C; Tue, 21 May 2019 02:13:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3051528901 for ; Tue, 21 May 2019 02:13:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727518AbfEUCNu (ORCPT ); Mon, 20 May 2019 22:13:50 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:35198 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726335AbfEUCNu (ORCPT ); Mon, 20 May 2019 22:13:50 -0400 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x4L26cXZ042479 for ; Mon, 20 May 2019 22:13:48 -0400 Received: from e36.co.us.ibm.com (e36.co.us.ibm.com [32.97.110.154]) by mx0a-001b2d01.pphosted.com with ESMTP id 2sm87f89rp-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 20 May 2019 22:13:48 -0400 Received: from localhost by e36.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 21 May 2019 03:13:43 +0100 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp07028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x4L2DgKS2228498 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 21 May 2019 02:13:42 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3931078063; Tue, 21 May 2019 02:13:42 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A3C3D78060; Tue, 21 May 2019 02:13:41 +0000 (GMT) Received: from talon7.ibm.com (unknown [9.41.179.222]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Tue, 21 May 2019 02:13:41 +0000 (GMT) From: Eddie James To: linux-iio@vger.kernel.org Cc: linux-kernel@vger.kernel.org, joel@jms.id.au, lars@metafoo.de, knaack.h@gmx.de, jic23@kernel.org, Eddie James Subject: [PATCH v4 1/3] iio: Add driver for Infineon DPS310 Date: Mon, 20 May 2019 21:13:32 -0500 X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1558404814-26078-1-git-send-email-eajames@linux.ibm.com> References: <1558404814-26078-1-git-send-email-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 19052102-0020-0000-0000-00000EED096A X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011134; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000286; SDB=6.01206296; UDB=6.00633418; IPR=6.00987257; MB=3.00026978; MTD=3.00000008; XFM=3.00000015; UTC=2019-05-21 02:13:45 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19052102-0021-0000-0000-000065E748A6 Message-Id: <1558404814-26078-2-git-send-email-eajames@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-20_09:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905210011 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Joel Stanley The DPS310 is a temperature and pressure sensor. It can be accessed over i2c and SPI, but this driver only supports polling over i2c. Signed-off-by: Eddie James Signed-off-by: Joel Stanley --- MAINTAINERS | 6 + drivers/iio/pressure/Kconfig | 11 + drivers/iio/pressure/Makefile | 1 + drivers/iio/pressure/dps310.c | 468 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 486 insertions(+) create mode 100644 drivers/iio/pressure/dps310.c diff --git a/MAINTAINERS b/MAINTAINERS index a2cd369..091eb49 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7760,6 +7760,12 @@ W: http://industrypack.sourceforge.net S: Maintained F: drivers/ipack/ +INFINEON DPS310 Driver +M: Eddie James +L: linux-iio@vger.kernel.org +F: drivers/iio/pressure/dps310.c +S: Maintained + INFINIBAND SUBSYSTEM M: Doug Ledford M: Jason Gunthorpe diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig index efeb89f..97976de 100644 --- a/drivers/iio/pressure/Kconfig +++ b/drivers/iio/pressure/Kconfig @@ -52,6 +52,17 @@ config IIO_CROS_EC_BARO To compile this driver as a module, choose M here: the module will be called cros_ec_baro. +config DPS310 + tristate "Infineon DPS310 pressure and temperature sensor" + depends on I2C + select REGMAP_I2C + help + Support for the Infineon DPS310 digital barometric pressure sensor. + It can be accessed over I2C bus. + + This driver can also be built as a module. If so, the module will be + called dps310. + config HID_SENSOR_PRESS depends on HID_SENSOR_HUB select IIO_BUFFER diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile index c2058d7..d8f5ace 100644 --- a/drivers/iio/pressure/Makefile +++ b/drivers/iio/pressure/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_BMP280) += bmp280.o bmp280-objs := bmp280-core.o bmp280-regmap.o obj-$(CONFIG_BMP280_I2C) += bmp280-i2c.o obj-$(CONFIG_BMP280_SPI) += bmp280-spi.o +obj-$(CONFIG_DPS310) += dps310.o obj-$(CONFIG_IIO_CROS_EC_BARO) += cros_ec_baro.o obj-$(CONFIG_HID_SENSOR_PRESS) += hid-sensor-press.o obj-$(CONFIG_HP03) += hp03.o diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c new file mode 100644 index 0000000..9acfccb --- /dev/null +++ b/drivers/iio/pressure/dps310.c @@ -0,0 +1,468 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright IBM Corp 2019 +/* + * The DPS310 is a barometric pressure and temperature sensor. + * Currently only reading a single temperature is supported by + * this driver. + * + * https://www.infineon.com/dgdl/?fileId=5546d462576f34750157750826c42242 + * + * Temperature calculation: + * c0 * 0.5 + c1 * T_raw / kT °C + * + * TODO: + * - Pressure sensor readings + * - Optionally support the FIFO + */ + +#include +#include +#include + +#include +#include + +#define DPS310_DEV_NAME "dps310" + +#define DPS310_PRS_B0 0x00 +#define DPS310_PRS_B1 0x01 +#define DPS310_PRS_B2 0x02 +#define DPS310_TMP_B0 0x03 +#define DPS310_TMP_B1 0x04 +#define DPS310_TMP_B2 0x05 +#define DPS310_PRS_CFG 0x06 +#define DPS310_TMP_CFG 0x07 +#define DPS310_TMP_RATE_BITS GENMASK(6, 4) +#define DPS310_TMP_PRC_BITS GENMASK(3, 0) +#define DPS310_TMP_EXT BIT(7) +#define DPS310_MEAS_CFG 0x08 +#define DPS310_MEAS_CTRL_BITS GENMASK(2, 0) +#define DPS310_PRS_EN BIT(0) +#define DPS310_TEMP_EN BIT(1) +#define DPS310_BACKGROUND BIT(2) +#define DPS310_PRS_RDY BIT(4) +#define DPS310_TMP_RDY BIT(5) +#define DPS310_SENSOR_RDY BIT(6) +#define DPS310_COEF_RDY BIT(7) +#define DPS310_CFG_REG 0x09 +#define DPS310_INT_HL BIT(7) +#define DPS310_TMP_SHIFT_EN BIT(3) +#define DPS310_PRS_SHIFT_EN BIT(4) +#define DPS310_FIFO_EN BIT(5) +#define DPS310_SPI_EN BIT(6) +#define DPS310_RESET 0x0c +#define DPS310_RESET_MAGIC 0x09 +#define DPS310_COEF_BASE 0x10 +#define DPS310_COEF_SRC 0x28 + +/* Make sure sleep time is <= 20ms for usleep_range */ +#define DPS310_POLL_SLEEP_US(t) min(20000, (t) / 8) +/* Silently handle error in rate value here */ +#define DPS310_POLL_TIMEOUT_US(rc) ((rc) <= 0 ? 1000000 : 1000000 / (rc)) + +#define DPS310_PRS_BASE DPS310_PRS_B0 +#define DPS310_TMP_BASE DPS310_TMP_B0 + +/* + * These values (defined in the spec) indicate how to scale the raw register + * values for each level of precision available. + */ +static const int scale_factors[] = { + 524288, + 1572864, + 3670016, + 7864320, + 253952, + 516096, + 1040384, + 2088960, +}; + +struct dps310_data { + struct i2c_client *client; + struct regmap *regmap; + struct mutex lock; /* Lock for sequential HW access functions */ + + s32 c0, c1; + s32 temp_raw; +}; + +static const struct iio_chan_spec dps310_channels[] = { + { + .type = IIO_TEMP, + .info_mask_separate = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | + BIT(IIO_CHAN_INFO_SAMP_FREQ) | + BIT(IIO_CHAN_INFO_PROCESSED), + }, +}; + +/* To be called after checking the COEF_RDY bit in MEAS_CFG */ +static int dps310_get_temp_coef(struct dps310_data *data) +{ + int rc; + u8 coef[3]; + u32 c0, c1; + + /* + * Read temperature calibration coefficients c0 and c1 from the + * COEF register. The numbers are 12-bit 2's compliment numbers + */ + rc = regmap_bulk_read(data->regmap, DPS310_COEF_BASE, coef, + sizeof(coef)); + if (rc < 0) + return rc; + + c0 = (coef[0] << 4) | (coef[1] >> 4); + data->c0 = sign_extend32(c0, 11); + + c1 = ((coef[1] & GENMASK(3, 0)) << 8) | coef[2]; + data->c1 = sign_extend32(c1, 11); + + return 0; +} + +static int dps310_get_temp_precision(struct dps310_data *data) +{ + int rc; + int val; + + rc = regmap_read(data->regmap, DPS310_TMP_CFG, &val); + if (rc < 0) + return rc; + + /* + * Scale factor is bottom 4 bits of the register, but 1111 is + * reserved so just grab bottom three + */ + return BIT(val & GENMASK(2, 0)); +} + +/* Called with lock held */ +static int dps310_set_temp_precision(struct dps310_data *data, int val) +{ + int rc; + u8 shift_en; + + if (val < 0 || val > 128) + return -EINVAL; + + shift_en = val >= 16 ? DPS310_TMP_SHIFT_EN : 0; + rc = regmap_write_bits(data->regmap, DPS310_CFG_REG, + DPS310_TMP_SHIFT_EN, shift_en); + if (rc) + return rc; + + return regmap_update_bits(data->regmap, DPS310_TMP_CFG, + DPS310_TMP_PRC_BITS, ilog2(val)); +} + +/* Called with lock held */ +static int dps310_set_temp_samp_freq(struct dps310_data *data, int freq) +{ + u8 val; + + if (freq < 0 || freq > 128) + return -EINVAL; + + val = ilog2(freq) << 4; + + return regmap_update_bits(data->regmap, DPS310_TMP_CFG, + DPS310_TMP_RATE_BITS, val); +} + +static int dps310_get_temp_samp_freq(struct dps310_data *data) +{ + int rc; + int val; + + rc = regmap_read(data->regmap, DPS310_TMP_CFG, &val); + if (rc < 0) + return rc; + + return BIT((val & DPS310_TMP_RATE_BITS) >> 4); +} + +static int dps310_get_temp_k(struct dps310_data *data) +{ + int rc = dps310_get_temp_precision(data); + + if (rc < 0) + return rc; + + return scale_factors[ilog2(rc)]; +} + +static int dps310_read_temp(struct dps310_data *data) +{ + int rc; + int rate; + int ready; + int timeout; + s32 raw; + u8 val[3]; + + if (mutex_lock_interruptible(&data->lock)) + return -EINTR; + + rate = dps310_get_temp_samp_freq(data); + timeout = DPS310_POLL_TIMEOUT_US(rate); + + /* Poll for sensor readiness; base the timeout upon the sample rate. */ + rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready, + ready & DPS310_TMP_RDY, + DPS310_POLL_SLEEP_US(timeout), timeout); + if (rc < 0) + goto done; + + rc = regmap_bulk_read(data->regmap, DPS310_TMP_BASE, val, sizeof(val)); + if (rc < 0) + goto done; + + raw = (val[0] << 16) | (val[1] << 8) | val[2]; + data->temp_raw = sign_extend32(raw, 23); + +done: + mutex_unlock(&data->lock); + return rc; +} + +static bool dps310_is_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case DPS310_PRS_CFG: + case DPS310_TMP_CFG: + case DPS310_MEAS_CFG: + case DPS310_CFG_REG: + case DPS310_RESET: + return true; + default: + return false; + } +} + +static bool dps310_is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case DPS310_PRS_B0: + case DPS310_PRS_B1: + case DPS310_PRS_B2: + case DPS310_TMP_B0: + case DPS310_TMP_B1: + case DPS310_TMP_B2: + case DPS310_MEAS_CFG: + return true; + default: + return false; + } +} + +static int dps310_write_raw(struct iio_dev *iio, + struct iio_chan_spec const *chan, int val, + int val2, long mask) +{ + int rc; + struct dps310_data *data = iio_priv(iio); + + if (chan->type != IIO_TEMP) + return -EINVAL; + + if (mutex_lock_interruptible(&data->lock)) + return -EINTR; + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + rc = dps310_set_temp_samp_freq(data, val); + break; + + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + rc = dps310_set_temp_precision(data, val); + break; + + default: + rc = -EINVAL; + break; + } + + mutex_unlock(&data->lock); + return rc; +} + +static int dps310_calculate_temp(struct dps310_data *data) +{ + s64 c0; + s64 t; + int kt = dps310_get_temp_k(data); + + if (kt < 0) + return kt; + + /* Obtain inverse-scaled offset */ + c0 = div_s64((s64)kt * (s64)data->c0, 2); + + /* Add the offset to the unscaled temperature */ + t = c0 + ((s64)data->temp_raw * (s64)data->c1); + + /* Convert to milliCelsius and scale the temperature */ + return (int)div_s64(t * 1000LL, kt); +} + +static int dps310_read_raw(struct iio_dev *iio, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct dps310_data *data = iio_priv(iio); + int rc; + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + rc = dps310_get_temp_samp_freq(data); + if (rc < 0) + return rc; + + *val = rc; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_PROCESSED: + rc = dps310_read_temp(data); + if (rc) + return rc; + + rc = dps310_calculate_temp(data); + if (rc < 0) + return rc; + + *val = rc; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + rc = dps310_get_temp_precision(data); + if (rc < 0) + return rc; + + *val = rc; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static void dps310_reset(void *action_data) +{ + struct dps310_data *data = action_data; + + regmap_write(data->regmap, DPS310_RESET, DPS310_RESET_MAGIC); +} + +static const struct regmap_config dps310_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .writeable_reg = dps310_is_writeable_reg, + .volatile_reg = dps310_is_volatile_reg, + .cache_type = REGCACHE_RBTREE, + .max_register = DPS310_COEF_SRC, +}; + +static const struct iio_info dps310_info = { + .read_raw = dps310_read_raw, + .write_raw = dps310_write_raw, +}; + +static int dps310_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct dps310_data *data; + struct iio_dev *iio; + int rc, ready; + + iio = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!iio) + return -ENOMEM; + + data = iio_priv(iio); + data->client = client; + mutex_init(&data->lock); + + iio->dev.parent = &client->dev; + iio->name = id->name; + iio->channels = dps310_channels; + iio->num_channels = ARRAY_SIZE(dps310_channels); + iio->info = &dps310_info; + iio->modes = INDIO_DIRECT_MODE; + + data->regmap = devm_regmap_init_i2c(client, &dps310_regmap_config); + if (IS_ERR(data->regmap)) + return PTR_ERR(data->regmap); + + /* Register to run the device reset when the device is removed */ + rc = devm_add_action_or_reset(&client->dev, dps310_reset, data); + if (rc) + return rc; + + /* + * Set up external (MEMS) temperature sensor in single sample, one + * measurement per second mode + */ + rc = regmap_write(data->regmap, DPS310_TMP_CFG, DPS310_TMP_EXT); + if (rc < 0) + return rc; + + /* Temp shift is disabled when PRC <= 8 */ + rc = regmap_write_bits(data->regmap, DPS310_CFG_REG, + DPS310_TMP_SHIFT_EN, 0); + if (rc < 0) + return rc; + + /* MEAS_CFG doesn't update correctly unless first written with 0 */ + rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG, + DPS310_MEAS_CTRL_BITS, 0); + if (rc < 0) + return rc; + + /* Turn on temperature measurement in the background */ + rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG, + DPS310_MEAS_CTRL_BITS, + DPS310_TEMP_EN | DPS310_BACKGROUND); + if (rc < 0) + return rc; + + /* + * Calibration coefficients required for reporting temperature. + * They are available 40ms after the device has started + */ + rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready, + ready & DPS310_COEF_RDY, 10000, 40000); + if (rc < 0) + return rc; + + rc = dps310_get_temp_coef(data); + if (rc < 0) + return rc; + + rc = devm_iio_device_register(&client->dev, iio); + if (rc) + return rc; + + i2c_set_clientdata(client, iio); + + return 0; +} + +static const struct i2c_device_id dps310_id[] = { + { DPS310_DEV_NAME, 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, dps310_id); + +static struct i2c_driver dps310_driver = { + .driver = { + .name = DPS310_DEV_NAME, + }, + .probe = dps310_probe, + .id_table = dps310_id, +}; +module_i2c_driver(dps310_driver); + +MODULE_AUTHOR("Joel Stanley "); +MODULE_DESCRIPTION("Infineon DPS310 pressure and temperature sensor"); +MODULE_LICENSE("GPL v2");