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Thu, 14 Nov 2019 11:09:10 +0100 Received: from atgrzsw1696.avl01.avlcorp.lan (10.12.64.164) by atgrzsw1695.avl01.avlcorp.lan (10.12.64.163) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 14 Nov 2019 11:09:09 +0100 Received: from ATGRZWN210080.avl01.avlcorp.lan (10.12.100.12) by atgrzsw1696.avl01.avlcorp.lan (10.12.64.164) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 14 Nov 2019 11:09:09 +0100 From: To: CC: , , Subject: [PATCH 1/3] iio: pressure: Add driver for DLH pressure sensors Date: Thu, 14 Nov 2019 11:09:06 +0100 Message-ID: <20191114100908.11180-2-tomislav.denis@avl.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20191114100908.11180-1-tomislav.denis@avl.com> References: <20191114100908.11180-1-tomislav.denis@avl.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: f9e74532-fb7d-4806-8539-2b9574eafa9a X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-11-14_01:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1910280000 definitions=main-1911140094 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-11-14_01:2019-11-14,2019-11-14 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 lowpriorityscore=0 adultscore=0 spamscore=0 mlxscore=0 malwarescore=0 suspectscore=1 mlxlogscore=999 priorityscore=1501 bulkscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1911140094 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Tomislav Denis All Sensors DLH is series of low voltage digital pressure sensors. Additionally to pressure value sensors deliver a temperature value. Sensors can be accessed over I2C and SPI, this driver supports only I2C access. Signed-off-by: Tomislav Denis --- MAINTAINERS | 7 + drivers/iio/pressure/Kconfig | 12 ++ drivers/iio/pressure/Makefile | 1 + drivers/iio/pressure/dlh-i2c.c | 322 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 342 insertions(+) create mode 100644 drivers/iio/pressure/dlh-i2c.c diff --git a/MAINTAINERS b/MAINTAINERS index 8323258..2a08923 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -668,6 +668,13 @@ S: Maintained F: Documentation/i2c/busses/i2c-ali1563.rst F: drivers/i2c/busses/i2c-ali1563.c +ALL SENSORS DLH SERIES PRESSURE SENSORS DRIVER +M: Tomislav Denis +W: http://www.allsensors.com/cad/DS-0355_Rev_B.PDF +S: Maintained +L: linux-iio@vger.kernel.org +F: drivers/iio/pressure/dlh-i2c.c + ALLEGRO DVT VIDEO IP CORE DRIVER M: Michael Tretter R: Pengutronix Kernel Team diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig index ba420e4..504de3e 100644 --- a/drivers/iio/pressure/Kconfig +++ b/drivers/iio/pressure/Kconfig @@ -53,6 +53,18 @@ config IIO_CROS_EC_BARO To compile this driver as a module, choose M here: the module will be called cros_ec_baro. +config DLH_I2C + tristate "All Sensors DLH series low voltage digital pressure sensors" + depends on I2C + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + help + Say yes here to build support for the All Sensors DLH series + pressure sensors driver. + + To compile this driver as a module, choose M here: the module + will be called dlh-i2c. + config DPS310 tristate "Infineon DPS310 pressure and temperature sensor" depends on I2C diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile index d8f5ace..1851a36 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_DLH_I2C) += dlh-i2c.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 diff --git a/drivers/iio/pressure/dlh-i2c.c b/drivers/iio/pressure/dlh-i2c.c new file mode 100644 index 0000000..4ef13c2 --- /dev/null +++ b/drivers/iio/pressure/dlh-i2c.c @@ -0,0 +1,322 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * All Sensors DLH series low voltage digital pressure sensors + * + * Copyright (c) 2019 AVL DiTEST GmbH + * Tomislav Denis + * + * Datasheet: http://www.allsensors.com/cad/DS-0355_Rev_B.PDF + */ + +#include +#include +#include +#include +#include +#include +#include + +/* Commands */ +#define DLH_START_SINGLE 0xAA + +/* Status bits */ +#define DLH_STATUS_OK 0x40 + +/* DLH data format */ +#define DLH_NUM_READ_BYTES 7 +#define DLH_NUM_DATA_BYTES 3 +#define DLH_NUM_PR_BITS 24 +#define DLH_NUM_TEMP_BITS 24 + +/* DLH timings */ +#define DLH_SINGLE_DUT_MS 5 + +enum dhl_ids { + dlhl60d, + dlhl60g, +}; + +struct dlh_info { + u8 osdig; /* digital offset factor */ + unsigned int fss; /* full scale span (inch H2O) */ +}; + +struct dlh_state { + struct i2c_client *client; + struct dlh_info info; + u8 rx_buf[DLH_NUM_READ_BYTES] ____cacheline_aligned; +}; + +static struct dlh_info dlh_info_tbl[] = { + [dlhl60d] = { + .osdig = 2, + .fss = 120, + }, + [dlhl60g] = { + .osdig = 10, + .fss = 60, + }, +}; + +static int dlh_i2c_read_direct(struct dlh_state *st, + unsigned int *pressure, unsigned int *temperature) +{ + int ret; + + ret = i2c_smbus_write_byte(st->client, DLH_START_SINGLE); + if (ret) { + dev_err(&st->client->dev, + "%s: I2C write byte failed\n", __func__); + return ret; + } + + mdelay(DLH_SINGLE_DUT_MS); + + ret = i2c_master_recv(st->client, st->rx_buf, DLH_NUM_READ_BYTES); + if (ret < 0) { + dev_err(&st->client->dev, + "%s: I2C read block failed\n", __func__); + return ret; + } + + if (st->rx_buf[0] != DLH_STATUS_OK) { + dev_err(&st->client->dev, + "%s: invalid status 0x%02x\n", __func__, st->rx_buf[0]); + return -EBUSY; + } + + *pressure = be32_to_cpup((u32 *)&st->rx_buf[1]) >> 8; + *temperature = be32_to_cpup((u32 *)&st->rx_buf[3]) & + GENMASK(DLH_NUM_TEMP_BITS - 1, 0); + + return 0; +} + +static int dlh_i2c_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *channel, int *value, + int *value2, long mask) +{ + struct dlh_state *st = iio_priv(indio_dev); + unsigned int pressure, temperature; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (iio_buffer_enabled(indio_dev)) + return -EBUSY; + + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + ret = dlh_i2c_read_direct(st, &pressure, &temperature); + iio_device_release_direct_mode(indio_dev); + if (ret) + return ret; + + switch (channel->type) { + case IIO_PRESSURE: /* inch H2O */ + *value = pressure; + return IIO_VAL_INT; + + case IIO_TEMP: /* degrees Celsius */ + *value = temperature; + return IIO_VAL_INT; + + default: + return -EINVAL; + } + case IIO_CHAN_INFO_SCALE: + switch (channel->type) { + case IIO_PRESSURE: + *value = 125 * st->info.fss; + *value2 = 100 * (1 << DLH_NUM_PR_BITS); + return IIO_VAL_FRACTIONAL; + + case IIO_TEMP: + *value = 125; + *value2 = DLH_NUM_TEMP_BITS; + return IIO_VAL_FRACTIONAL_LOG2; + + default: + return -EINVAL; + } + case IIO_CHAN_INFO_OFFSET: + switch (channel->type) { + case IIO_PRESSURE: + *value = -125 * st->info.fss; + *value2 = 100 * st->info.osdig; + return IIO_VAL_FRACTIONAL; + + case IIO_TEMP: + *value = -40; + return IIO_VAL_INT; + + default: + return -EINVAL; + } + } + + return -EINVAL; +} + +static const struct iio_info dlh_i2c_info = { + .read_raw = dlh_i2c_read_raw, +}; + +static const struct iio_chan_spec dlh_i2c_channels[] = { + { + .type = IIO_PRESSURE, + .indexed = 1, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .info_mask_shared_by_type = + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET), + .scan_index = 0, + .scan_type = { + .sign = 'u', + .realbits = DLH_NUM_PR_BITS, + .storagebits = 32, + .shift = 8, + .endianness = IIO_BE, + }, + }, { + .type = IIO_TEMP, + .indexed = 1, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .info_mask_shared_by_type = + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET), + .scan_index = 1, + .scan_type = { + .sign = 'u', + .realbits = DLH_NUM_TEMP_BITS, + .storagebits = 32, + .shift = 8, + .endianness = IIO_BE, + }, + } +}; + +static irqreturn_t dlh_i2c_trigger_handler(int irq, void *private) +{ + struct iio_poll_func *pf = (struct iio_poll_func *)private; + struct iio_dev *indio_dev = pf->indio_dev; + struct dlh_state *st = iio_priv(indio_dev); + int ret; + unsigned int chn, i = 0; + __be32 tmp_buf[2]; + + ret = i2c_master_recv(st->client, st->rx_buf, DLH_NUM_READ_BYTES); + if (ret < 0) { + dev_err(&st->client->dev, + "%s: I2C read block failed\n", __func__); + goto out; + } + + if (st->rx_buf[0] != DLH_STATUS_OK) { + dev_err(&st->client->dev, + "%s: invalid status 0x%02x\n", __func__, st->rx_buf[0]); + goto out; + } + + ret = i2c_smbus_write_byte(st->client, DLH_START_SINGLE); + if (ret) { + dev_err(&st->client->dev, + "%s: I2C write byte failed\n", __func__); + goto out; + } + + for_each_set_bit(chn, indio_dev->active_scan_mask, + indio_dev->masklength) { + memcpy(tmp_buf + i, + &st->rx_buf[1] + chn * DLH_NUM_DATA_BYTES, + DLH_NUM_DATA_BYTES); + i++; + } + + iio_push_to_buffers(indio_dev, tmp_buf); + +out: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static int dlh_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct dlh_state *st; + struct iio_dev *indio_dev; + int ret; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE)) { + dev_err(&client->dev, + "adapter doesn't support required i2c functionality\n"); + return -EOPNOTSUPP; + } + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st)); + if (!indio_dev) { + dev_err(&client->dev, "failed to allocate iio device\n"); + return -ENOMEM; + } + + i2c_set_clientdata(client, indio_dev); + + st = iio_priv(indio_dev); + st->info = dlh_info_tbl[id->driver_data]; + st->client = client; + + indio_dev->name = id->name; + indio_dev->dev.parent = &client->dev; + indio_dev->dev.of_node = client->dev.of_node; + indio_dev->info = &dlh_i2c_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = dlh_i2c_channels; + indio_dev->num_channels = ARRAY_SIZE(dlh_i2c_channels); + + ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, + &iio_pollfunc_store_time, &dlh_i2c_trigger_handler, NULL); + if (ret) { + dev_err(&client->dev, "failed to setup iio buffer\n"); + return ret; + } + + ret = devm_iio_device_register(&client->dev, indio_dev); + if (ret) { + dev_err(&client->dev, "failed to register iio device\n"); + return ret; + } + + return 0; +} + +static const struct of_device_id dlh_i2c_of_match[] = { + { .compatible = "asc,dlhl60d" }, + { .compatible = "asc,dlhl60g" }, + {} +}; +MODULE_DEVICE_TABLE(of, dlh_i2c_of_match); + +static const struct i2c_device_id dlh_i2c_id[] = { + { "dlhl60d", dlhl60d }, + { "dlhl60g", dlhl60g }, + {} +}; +MODULE_DEVICE_TABLE(i2c, dlh_i2c_id); + +static struct i2c_driver dlh_i2c_driver = { + .driver = { + .name = "dlh_i2c", + .of_match_table = dlh_i2c_of_match, + }, + .probe = dlh_i2c_probe, + .id_table = dlh_i2c_id, +}; +module_i2c_driver(dlh_i2c_driver); + +MODULE_AUTHOR("Tomislav Denis "); +MODULE_DESCRIPTION("Driver for All Sensors DLH series pressure sensors"); +MODULE_LICENSE("GPL v2");