On Wed, 4 Dec 2019 11:03:52 +0100 <tomislav.denis@xxxxxxx> wrote: > From: Tomislav Denis <tomislav.denis@xxxxxxx> > > 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 <tomislav.denis@xxxxxxx> Ah. Sorry I missed this before, but the -i2c part of the filename is effectively a wild card. Given we can't know what parts asc will release in the future that will be incompatible we should avoid generic naming and just pick a supported part. Given you are respinning anyway a few things inline I might just have fixed up whilst applying otherwise. Thanks, Jonathan > --- > MAINTAINERS | 7 + > drivers/iio/pressure/Kconfig | 12 ++ > drivers/iio/pressure/Makefile | 1 + > drivers/iio/pressure/dlh-i2c.c | 375 +++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 395 insertions(+) > create mode 100644 drivers/iio/pressure/dlh-i2c.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index d5ea4e4..39d6f0f 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 <tomislav.denis@xxxxxxx> > +W: http://www.allsensors.com/ > +S: Maintained > +L: linux-iio@xxxxxxxxxxxxxxx > +F: drivers/iio/pressure/dlh-i2c.c > + > ALLEGRO DVT VIDEO IP CORE DRIVER > M: Michael Tretter <m.tretter@xxxxxxxxxxxxxx> > R: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx> > 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..b8491a8 > --- /dev/null > +++ b/drivers/iio/pressure/dlh-i2c.c > @@ -0,0 +1,375 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * All Sensors DLH series low voltage digital pressure sensors > + * > + * Copyright (c) 2019 AVL DiTEST GmbH > + * Tomislav Denis <tomislav.denis@xxxxxxx> > + * > + * Datasheet: http://www.allsensors.com/cad/DS-0355_Rev_B.PDF > + */ > + > +#include <linux/module.h> > +#include <linux/delay.h> > +#include <linux/i2c.h> > +#include <linux/iio/iio.h> > +#include <linux/iio/buffer.h> > +#include <linux/iio/trigger.h> This trigger.h header should only need to be included in drivers that create a trigger, hence shouldn't be included here. > +#include <linux/iio/trigger_consumer.h> > +#include <linux/iio/triggered_buffer.h> > + > +/* 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; > + bool use_interrupt; > + struct completion completion; > + 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_cmd_start_single(struct dlh_state *st) > +{ > + 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; > +} > + > +static int dlh_i2c_cmd_read_data(struct dlh_state *st) > +{ > + int ret; > + > + 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; > + } > + > + return 0; > +} > + > +static int dlh_i2c_start_capture_and_read(struct dlh_state *st) > +{ > + int ret; > + > + if (st->use_interrupt) > + reinit_completion(&st->completion); > + > + ret = dlh_i2c_cmd_start_single(st); > + if (ret) > + return ret; > + > + if (st->use_interrupt) { > + ret = wait_for_completion_timeout(&st->completion, > + msecs_to_jiffies(DLH_SINGLE_DUT_MS)); > + if (!ret) { > + dev_err(&st->client->dev, > + "%s: conversion timed out\n", __func__); > + return -ETIMEDOUT; > + } > + } else { > + mdelay(DLH_SINGLE_DUT_MS); > + } > + > + return dlh_i2c_cmd_read_data(st); > +} > + > +static int dlh_i2c_read_direct(struct dlh_state *st, > + unsigned int *pressure, unsigned int *temperature) > +{ > + int ret; > + > + ret = dlh_i2c_start_capture_and_read(st); > + if (ret) > + return ret; > + > + *pressure = be32_to_cpup((u32 *)&st->rx_buf[1]) >> 8; Odd casting here. You are casting to a cpu endian u32 and then claiming it's big endian. (__be32 *) > + *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; > + s64 tmp; > + s32 rem; > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + 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: > + *value = pressure; > + return IIO_VAL_INT; > + > + case IIO_TEMP: > + *value = temperature; > + return IIO_VAL_INT; > + > + default: > + return -EINVAL; > + } > + case IIO_CHAN_INFO_SCALE: > + switch (channel->type) { > + case IIO_PRESSURE: > + tmp = div_s64(125LL * st->info.fss * 24909 * 100, > + 1 << DLH_NUM_PR_BITS); > + tmp = div_s64_rem(tmp, 1000000000LL, &rem); > + *value = tmp; > + *value2 = rem; > + return IIO_VAL_INT_PLUS_NANO; > + > + case IIO_TEMP: > + *value = 125 * 1000; > + *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 * 24909; > + *value2 = 100 * st->info.osdig * 100000; > + return IIO_VAL_FRACTIONAL; > + > + case IIO_TEMP: > + *value = -40 * 1000; > + 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 = 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 = dlh_i2c_start_capture_and_read(st); > + if (ret) > + 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 irqreturn_t dlh_i2c_interrupt(int irq, void *private) > +{ > + struct iio_dev *indio_dev = private; > + struct dlh_state *st = iio_priv(indio_dev); > + > + complete(&st->completion); > + > + 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; > + st->use_interrupt = false; > + > + 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); > + > + if (client->irq > 0) { > + ret = devm_request_threaded_irq(&client->dev, client->irq, > + dlh_i2c_interrupt, NULL, > + IRQF_TRIGGER_RISING | IRQF_ONESHOT, > + id->name, indio_dev); > + if (ret) { > + dev_err(&client->dev, "failed to allocate threaded irq"); > + return ret; > + } > + > + st->use_interrupt = true; > + init_completion(&st->completion); > + } > + > + ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, > + NULL, &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; > +} > + > +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 <tomislav.denis@xxxxxxx>"); > +MODULE_DESCRIPTION("Driver for All Sensors DLH series pressure sensors"); > +MODULE_LICENSE("GPL v2");
