diff options
author | Denis CIOCCA <denis.ciocca@st.com> | 2013-06-03 14:58:00 (GMT) |
---|---|---|
committer | Jonathan Cameron <jic23@kernel.org> | 2013-06-05 17:41:23 (GMT) |
commit | 217494e5b780ad85485c1bb6382ce50b5fa2dc26 (patch) | |
tree | 26e9fd1c62477c099c05a3fbcdd265c287bc1ef8 | |
parent | 607a568ab69c5ac345a286267a27294888f8bb5f (diff) | |
download | linux-217494e5b780ad85485c1bb6382ce50b5fa2dc26.tar.xz |
iio:pressure: Add STMicroelectronics pressures driver
This patch adds a generic pressure driver for STMicroelectronics
pressure sensors, currently it supports: LPS331AP.
Signed-off-by: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
-rw-r--r-- | drivers/iio/Kconfig | 1 | ||||
-rw-r--r-- | drivers/iio/Makefile | 1 | ||||
-rw-r--r-- | drivers/iio/pressure/Kconfig | 35 | ||||
-rw-r--r-- | drivers/iio/pressure/Makefile | 10 | ||||
-rw-r--r-- | drivers/iio/pressure/st_pressure.h | 39 | ||||
-rw-r--r-- | drivers/iio/pressure/st_pressure_buffer.c | 105 | ||||
-rw-r--r-- | drivers/iio/pressure/st_pressure_core.c | 272 | ||||
-rw-r--r-- | drivers/iio/pressure/st_pressure_i2c.c | 77 | ||||
-rw-r--r-- | drivers/iio/pressure/st_pressure_spi.c | 76 |
9 files changed, 616 insertions, 0 deletions
diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig index daa3ddd..9af763a 100644 --- a/drivers/iio/Kconfig +++ b/drivers/iio/Kconfig @@ -73,5 +73,6 @@ source "drivers/iio/magnetometer/Kconfig" if IIO_TRIGGER source "drivers/iio/trigger/Kconfig" endif #IIO_TRIGGER +source "drivers/iio/pressure/Kconfig" endif # IIO diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile index a349a96..7a3866c 100644 --- a/drivers/iio/Makefile +++ b/drivers/iio/Makefile @@ -22,3 +22,4 @@ obj-y += imu/ obj-y += light/ obj-y += magnetometer/ obj-y += trigger/ +obj-y += pressure/ diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig new file mode 100644 index 0000000..9427f01 --- /dev/null +++ b/drivers/iio/pressure/Kconfig @@ -0,0 +1,35 @@ +# +# Pressure drivers +# +menu "Pressure Sensors" + +config IIO_ST_PRESS + tristate "STMicroelectronics pressures Driver" + depends on (I2C || SPI_MASTER) && SYSFS + select IIO_ST_SENSORS_CORE + select IIO_ST_PRESS_I2C if (I2C) + select IIO_ST_PRESS_SPI if (SPI_MASTER) + select IIO_TRIGGERED_BUFFER if (IIO_BUFFER) + help + Say yes here to build support for STMicroelectronics pressures: + LPS331AP. + + This driver can also be built as a module. If so, will be created + these modules: + - st_pressure (core functions for the driver [it is mandatory]); + - st_pressure_i2c (necessary for the I2C devices [optional*]); + - st_pressure_spi (necessary for the SPI devices [optional*]); + + (*) one of these is necessary to do something. + +config IIO_ST_PRESS_I2C + tristate + depends on IIO_ST_PRESS + depends on IIO_ST_SENSORS_I2C + +config IIO_ST_PRESS_SPI + tristate + depends on IIO_ST_PRESS + depends on IIO_ST_SENSORS_SPI + +endmenu diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile new file mode 100644 index 0000000..d4bb33e --- /dev/null +++ b/drivers/iio/pressure/Makefile @@ -0,0 +1,10 @@ +# +# Makefile for industrial I/O pressure drivers +# + +obj-$(CONFIG_IIO_ST_PRESS) += st_pressure.o +st_pressure-y := st_pressure_core.o +st_pressure-$(CONFIG_IIO_BUFFER) += st_pressure_buffer.o + +obj-$(CONFIG_IIO_ST_PRESS_I2C) += st_pressure_i2c.o +obj-$(CONFIG_IIO_ST_PRESS_SPI) += st_pressure_spi.o diff --git a/drivers/iio/pressure/st_pressure.h b/drivers/iio/pressure/st_pressure.h new file mode 100644 index 0000000..414e45a --- /dev/null +++ b/drivers/iio/pressure/st_pressure.h @@ -0,0 +1,39 @@ +/* + * STMicroelectronics pressures driver + * + * Copyright 2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * v. 1.0.0 + * Licensed under the GPL-2. + */ + +#ifndef ST_PRESS_H +#define ST_PRESS_H + +#include <linux/types.h> +#include <linux/iio/common/st_sensors.h> + +#define LPS331AP_PRESS_DEV_NAME "lps331ap" + +int st_press_common_probe(struct iio_dev *indio_dev); +void st_press_common_remove(struct iio_dev *indio_dev); + +#ifdef CONFIG_IIO_BUFFER +int st_press_allocate_ring(struct iio_dev *indio_dev); +void st_press_deallocate_ring(struct iio_dev *indio_dev); +int st_press_trig_set_state(struct iio_trigger *trig, bool state); +#define ST_PRESS_TRIGGER_SET_STATE (&st_press_trig_set_state) +#else /* CONFIG_IIO_BUFFER */ +static inline int st_press_allocate_ring(struct iio_dev *indio_dev) +{ + return 0; +} + +static inline void st_press_deallocate_ring(struct iio_dev *indio_dev) +{ +} +#define ST_PRESS_TRIGGER_SET_STATE NULL +#endif /* CONFIG_IIO_BUFFER */ + +#endif /* ST_PRESS_H */ diff --git a/drivers/iio/pressure/st_pressure_buffer.c b/drivers/iio/pressure/st_pressure_buffer.c new file mode 100644 index 0000000..f877ef8 --- /dev/null +++ b/drivers/iio/pressure/st_pressure_buffer.c @@ -0,0 +1,105 @@ +/* + * STMicroelectronics pressures driver + * + * Copyright 2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/stat.h> +#include <linux/interrupt.h> +#include <linux/i2c.h> +#include <linux/delay.h> +#include <linux/iio/iio.h> +#include <linux/iio/buffer.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> + +#include <linux/iio/common/st_sensors.h> +#include "st_pressure.h" + +int st_press_trig_set_state(struct iio_trigger *trig, bool state) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + + return st_sensors_set_dataready_irq(indio_dev, state); +} + +static int st_press_buffer_preenable(struct iio_dev *indio_dev) +{ + int err; + + err = st_sensors_set_enable(indio_dev, true); + if (err < 0) + goto st_press_set_enable_error; + + err = iio_sw_buffer_preenable(indio_dev); + +st_press_set_enable_error: + return err; +} + +static int st_press_buffer_postenable(struct iio_dev *indio_dev) +{ + int err; + struct st_sensor_data *pdata = iio_priv(indio_dev); + + pdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); + if (pdata->buffer_data == NULL) { + err = -ENOMEM; + goto allocate_memory_error; + } + + err = iio_triggered_buffer_postenable(indio_dev); + if (err < 0) + goto st_press_buffer_postenable_error; + + return err; + +st_press_buffer_postenable_error: + kfree(pdata->buffer_data); +allocate_memory_error: + return err; +} + +static int st_press_buffer_predisable(struct iio_dev *indio_dev) +{ + int err; + struct st_sensor_data *pdata = iio_priv(indio_dev); + + err = iio_triggered_buffer_predisable(indio_dev); + if (err < 0) + goto st_press_buffer_predisable_error; + + err = st_sensors_set_enable(indio_dev, false); + +st_press_buffer_predisable_error: + kfree(pdata->buffer_data); + return err; +} + +static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = { + .preenable = &st_press_buffer_preenable, + .postenable = &st_press_buffer_postenable, + .predisable = &st_press_buffer_predisable, +}; + +int st_press_allocate_ring(struct iio_dev *indio_dev) +{ + return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, + &st_sensors_trigger_handler, &st_press_buffer_setup_ops); +} + +void st_press_deallocate_ring(struct iio_dev *indio_dev) +{ + iio_triggered_buffer_cleanup(indio_dev); +} + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics pressures buffer"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/pressure/st_pressure_core.c b/drivers/iio/pressure/st_pressure_core.c new file mode 100644 index 0000000..9c343b4 --- /dev/null +++ b/drivers/iio/pressure/st_pressure_core.c @@ -0,0 +1,272 @@ +/* + * STMicroelectronics pressures driver + * + * Copyright 2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/mutex.h> +#include <linux/interrupt.h> +#include <linux/i2c.h> +#include <linux/gpio.h> +#include <linux/irq.h> +#include <linux/delay.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/trigger.h> +#include <linux/iio/buffer.h> +#include <asm/unaligned.h> + +#include <linux/iio/common/st_sensors.h> +#include "st_pressure.h" + +#define ST_PRESS_MBAR_TO_KPASCAL(x) (x * 10) +#define ST_PRESS_NUMBER_DATA_CHANNELS 1 + +/* DEFAULT VALUE FOR SENSORS */ +#define ST_PRESS_DEFAULT_OUT_XL_ADDR 0x28 +#define ST_TEMP_DEFAULT_OUT_L_ADDR 0x2b + +/* FULLSCALE */ +#define ST_PRESS_FS_AVL_1260MB 1260 + +/* CUSTOM VALUES FOR SENSOR 1 */ +#define ST_PRESS_1_WAI_EXP 0xbb +#define ST_PRESS_1_ODR_ADDR 0x20 +#define ST_PRESS_1_ODR_MASK 0x70 +#define ST_PRESS_1_ODR_AVL_1HZ_VAL 0x01 +#define ST_PRESS_1_ODR_AVL_7HZ_VAL 0x05 +#define ST_PRESS_1_ODR_AVL_13HZ_VAL 0x06 +#define ST_PRESS_1_ODR_AVL_25HZ_VAL 0x07 +#define ST_PRESS_1_PW_ADDR 0x20 +#define ST_PRESS_1_PW_MASK 0x80 +#define ST_PRESS_1_FS_ADDR 0x23 +#define ST_PRESS_1_FS_MASK 0x30 +#define ST_PRESS_1_FS_AVL_1260_VAL 0x00 +#define ST_PRESS_1_FS_AVL_1260_GAIN ST_PRESS_MBAR_TO_KPASCAL(244141) +#define ST_PRESS_1_FS_AVL_TEMP_GAIN 2083000 +#define ST_PRESS_1_BDU_ADDR 0x20 +#define ST_PRESS_1_BDU_MASK 0x04 +#define ST_PRESS_1_DRDY_IRQ_ADDR 0x22 +#define ST_PRESS_1_DRDY_IRQ_MASK 0x04 +#define ST_PRESS_1_MULTIREAD_BIT true +#define ST_PRESS_1_TEMP_OFFSET 42500 + +static const struct iio_chan_spec st_press_channels[] = { + ST_SENSORS_LSM_CHANNELS(IIO_PRESSURE, + BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + ST_SENSORS_SCAN_X, 0, IIO_NO_MOD, 'u', IIO_LE, 24, 24, + ST_PRESS_DEFAULT_OUT_XL_ADDR), + ST_SENSORS_LSM_CHANNELS(IIO_TEMP, + BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET), + -1, 0, IIO_NO_MOD, 's', IIO_LE, 16, 16, + ST_TEMP_DEFAULT_OUT_L_ADDR), + IIO_CHAN_SOFT_TIMESTAMP(1) +}; + +static const struct st_sensors st_press_sensors[] = { + { + .wai = ST_PRESS_1_WAI_EXP, + .sensors_supported = { + [0] = LPS331AP_PRESS_DEV_NAME, + }, + .ch = (struct iio_chan_spec *)st_press_channels, + .odr = { + .addr = ST_PRESS_1_ODR_ADDR, + .mask = ST_PRESS_1_ODR_MASK, + .odr_avl = { + { 1, ST_PRESS_1_ODR_AVL_1HZ_VAL, }, + { 7, ST_PRESS_1_ODR_AVL_7HZ_VAL, }, + { 13, ST_PRESS_1_ODR_AVL_13HZ_VAL, }, + { 25, ST_PRESS_1_ODR_AVL_25HZ_VAL, }, + }, + }, + .pw = { + .addr = ST_PRESS_1_PW_ADDR, + .mask = ST_PRESS_1_PW_MASK, + .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, + .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, + }, + .fs = { + .addr = ST_PRESS_1_FS_ADDR, + .mask = ST_PRESS_1_FS_MASK, + .fs_avl = { + [0] = { + .num = ST_PRESS_FS_AVL_1260MB, + .value = ST_PRESS_1_FS_AVL_1260_VAL, + .gain = ST_PRESS_1_FS_AVL_1260_GAIN, + .gain2 = ST_PRESS_1_FS_AVL_TEMP_GAIN, + }, + }, + }, + .bdu = { + .addr = ST_PRESS_1_BDU_ADDR, + .mask = ST_PRESS_1_BDU_MASK, + }, + .drdy_irq = { + .addr = ST_PRESS_1_DRDY_IRQ_ADDR, + .mask = ST_PRESS_1_DRDY_IRQ_MASK, + }, + .multi_read_bit = ST_PRESS_1_MULTIREAD_BIT, + .bootime = 2, + }, +}; + +static int st_press_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *ch, int *val, + int *val2, long mask) +{ + int err; + struct st_sensor_data *pdata = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + err = st_sensors_read_info_raw(indio_dev, ch, val); + if (err < 0) + goto read_error; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + *val = 0; + + switch (ch->type) { + case IIO_PRESSURE: + *val2 = pdata->current_fullscale->gain; + break; + case IIO_TEMP: + *val2 = pdata->current_fullscale->gain2; + break; + default: + err = -EINVAL; + goto read_error; + } + + return IIO_VAL_INT_PLUS_NANO; + case IIO_CHAN_INFO_OFFSET: + switch (ch->type) { + case IIO_TEMP: + *val = 425; + *val2 = 10; + break; + default: + err = -EINVAL; + goto read_error; + } + + return IIO_VAL_FRACTIONAL; + default: + return -EINVAL; + } + +read_error: + return err; +} + +static ST_SENSOR_DEV_ATTR_SAMP_FREQ(); +static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL(); + +static struct attribute *st_press_attributes[] = { + &iio_dev_attr_sampling_frequency_available.dev_attr.attr, + &iio_dev_attr_sampling_frequency.dev_attr.attr, + NULL, +}; + +static const struct attribute_group st_press_attribute_group = { + .attrs = st_press_attributes, +}; + +static const struct iio_info press_info = { + .driver_module = THIS_MODULE, + .attrs = &st_press_attribute_group, + .read_raw = &st_press_read_raw, +}; + +#ifdef CONFIG_IIO_TRIGGER +static const struct iio_trigger_ops st_press_trigger_ops = { + .owner = THIS_MODULE, + .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE, +}; +#define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops) +#else +#define ST_PRESS_TRIGGER_OPS NULL +#endif + +int st_press_common_probe(struct iio_dev *indio_dev) +{ + int err; + struct st_sensor_data *pdata = iio_priv(indio_dev); + + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &press_info; + + err = st_sensors_check_device_support(indio_dev, + ARRAY_SIZE(st_press_sensors), st_press_sensors); + if (err < 0) + goto st_press_common_probe_error; + + pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS; + pdata->multiread_bit = pdata->sensor->multi_read_bit; + indio_dev->channels = pdata->sensor->ch; + indio_dev->num_channels = ARRAY_SIZE(st_press_channels); + + pdata->current_fullscale = (struct st_sensor_fullscale_avl *) + &pdata->sensor->fs.fs_avl[0]; + pdata->odr = pdata->sensor->odr.odr_avl[0].hz; + + err = st_sensors_init_sensor(indio_dev); + if (err < 0) + goto st_press_common_probe_error; + + if (pdata->get_irq_data_ready(indio_dev) > 0) { + err = st_press_allocate_ring(indio_dev); + if (err < 0) + goto st_press_common_probe_error; + + err = st_sensors_allocate_trigger(indio_dev, + ST_PRESS_TRIGGER_OPS); + if (err < 0) + goto st_press_probe_trigger_error; + } + + err = iio_device_register(indio_dev); + if (err) + goto st_press_device_register_error; + + return err; + +st_press_device_register_error: + if (pdata->get_irq_data_ready(indio_dev) > 0) + st_sensors_deallocate_trigger(indio_dev); +st_press_probe_trigger_error: + if (pdata->get_irq_data_ready(indio_dev) > 0) + st_press_deallocate_ring(indio_dev); +st_press_common_probe_error: + return err; +} +EXPORT_SYMBOL(st_press_common_probe); + +void st_press_common_remove(struct iio_dev *indio_dev) +{ + struct st_sensor_data *pdata = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + if (pdata->get_irq_data_ready(indio_dev) > 0) { + st_sensors_deallocate_trigger(indio_dev); + st_press_deallocate_ring(indio_dev); + } + iio_device_free(indio_dev); +} +EXPORT_SYMBOL(st_press_common_remove); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics pressures driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/pressure/st_pressure_i2c.c b/drivers/iio/pressure/st_pressure_i2c.c new file mode 100644 index 0000000..7cebcc7 --- /dev/null +++ b/drivers/iio/pressure/st_pressure_i2c.c @@ -0,0 +1,77 @@ +/* + * STMicroelectronics pressures driver + * + * Copyright 2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/iio/iio.h> + +#include <linux/iio/common/st_sensors.h> +#include <linux/iio/common/st_sensors_i2c.h> +#include "st_pressure.h" + +static int st_press_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct iio_dev *indio_dev; + struct st_sensor_data *pdata; + int err; + + indio_dev = iio_device_alloc(sizeof(*pdata)); + if (indio_dev == NULL) { + err = -ENOMEM; + goto iio_device_alloc_error; + } + + pdata = iio_priv(indio_dev); + pdata->dev = &client->dev; + + st_sensors_i2c_configure(indio_dev, client, pdata); + + err = st_press_common_probe(indio_dev); + if (err < 0) + goto st_press_common_probe_error; + + return 0; + +st_press_common_probe_error: + iio_device_free(indio_dev); +iio_device_alloc_error: + return err; +} + +static int st_press_i2c_remove(struct i2c_client *client) +{ + st_press_common_remove(i2c_get_clientdata(client)); + + return 0; +} + +static const struct i2c_device_id st_press_id_table[] = { + { LPS331AP_PRESS_DEV_NAME }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, st_press_id_table); + +static struct i2c_driver st_press_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "st-press-i2c", + }, + .probe = st_press_i2c_probe, + .remove = st_press_i2c_remove, + .id_table = st_press_id_table, +}; +module_i2c_driver(st_press_driver); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics pressures i2c driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/pressure/st_pressure_spi.c b/drivers/iio/pressure/st_pressure_spi.c new file mode 100644 index 0000000..17a1490 --- /dev/null +++ b/drivers/iio/pressure/st_pressure_spi.c @@ -0,0 +1,76 @@ +/* + * STMicroelectronics pressures driver + * + * Copyright 2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/iio/iio.h> + +#include <linux/iio/common/st_sensors.h> +#include <linux/iio/common/st_sensors_spi.h> +#include "st_pressure.h" + +static int st_press_spi_probe(struct spi_device *spi) +{ + struct iio_dev *indio_dev; + struct st_sensor_data *pdata; + int err; + + indio_dev = iio_device_alloc(sizeof(*pdata)); + if (indio_dev == NULL) { + err = -ENOMEM; + goto iio_device_alloc_error; + } + + pdata = iio_priv(indio_dev); + pdata->dev = &spi->dev; + + st_sensors_spi_configure(indio_dev, spi, pdata); + + err = st_press_common_probe(indio_dev); + if (err < 0) + goto st_press_common_probe_error; + + return 0; + +st_press_common_probe_error: + iio_device_free(indio_dev); +iio_device_alloc_error: + return err; +} + +static int st_press_spi_remove(struct spi_device *spi) +{ + st_press_common_remove(spi_get_drvdata(spi)); + + return 0; +} + +static const struct spi_device_id st_press_id_table[] = { + { LPS331AP_PRESS_DEV_NAME }, + {}, +}; +MODULE_DEVICE_TABLE(spi, st_press_id_table); + +static struct spi_driver st_press_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "st-press-spi", + }, + .probe = st_press_spi_probe, + .remove = st_press_spi_remove, + .id_table = st_press_id_table, +}; +module_spi_driver(st_press_driver); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics pressures spi driver"); +MODULE_LICENSE("GPL v2"); |