diff options
Diffstat (limited to 'drivers/iio/pressure/abp060mg.c')
| -rw-r--r-- | drivers/iio/pressure/abp060mg.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/drivers/iio/pressure/abp060mg.c b/drivers/iio/pressure/abp060mg.c new file mode 100644 index 000000000000..43bdd0b9155f --- /dev/null +++ b/drivers/iio/pressure/abp060mg.c @@ -0,0 +1,276 @@ +/* + * Copyright (C) 2016 - Marcin Malagowski <mrc@bourne.st> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/iio/iio.h> + +#define ABP060MG_ERROR_MASK 0xC000 +#define ABP060MG_RESP_TIME_MS 40 +#define ABP060MG_MIN_COUNTS 1638 /* = 0x0666 (10% of u14) */ +#define ABP060MG_MAX_COUNTS 14745 /* = 0x3999 (90% of u14) */ +#define ABP060MG_NUM_COUNTS (ABP060MG_MAX_COUNTS - ABP060MG_MIN_COUNTS) + +enum abp_variant { + /* gage [kPa] */ + ABP006KG, ABP010KG, ABP016KG, ABP025KG, ABP040KG, ABP060KG, ABP100KG, + ABP160KG, ABP250KG, ABP400KG, ABP600KG, ABP001GG, + /* differential [kPa] */ + ABP006KD, ABP010KD, ABP016KD, ABP025KD, ABP040KD, ABP060KD, ABP100KD, + ABP160KD, ABP250KD, ABP400KD, + /* gage [psi] */ + ABP001PG, ABP005PG, ABP015PG, ABP030PG, ABP060PG, ABP100PG, ABP150PG, + /* differential [psi] */ + ABP001PD, ABP005PD, ABP015PD, ABP030PD, ABP060PD, +}; + +struct abp_config { + int min; + int max; +}; + +static struct abp_config abp_config[] = { + /* mbar & kPa variants */ + [ABP006KG] = { .min = 0, .max = 6000 }, + [ABP010KG] = { .min = 0, .max = 10000 }, + [ABP016KG] = { .min = 0, .max = 16000 }, + [ABP025KG] = { .min = 0, .max = 25000 }, + [ABP040KG] = { .min = 0, .max = 40000 }, + [ABP060KG] = { .min = 0, .max = 60000 }, + [ABP100KG] = { .min = 0, .max = 100000 }, + [ABP160KG] = { .min = 0, .max = 160000 }, + [ABP250KG] = { .min = 0, .max = 250000 }, + [ABP400KG] = { .min = 0, .max = 400000 }, + [ABP600KG] = { .min = 0, .max = 600000 }, + [ABP001GG] = { .min = 0, .max = 1000000 }, + [ABP006KD] = { .min = -6000, .max = 6000 }, + [ABP010KD] = { .min = -10000, .max = 10000 }, + [ABP016KD] = { .min = -16000, .max = 16000 }, + [ABP025KD] = { .min = -25000, .max = 25000 }, + [ABP040KD] = { .min = -40000, .max = 40000 }, + [ABP060KD] = { .min = -60000, .max = 60000 }, + [ABP100KD] = { .min = -100000, .max = 100000 }, + [ABP160KD] = { .min = -160000, .max = 160000 }, + [ABP250KD] = { .min = -250000, .max = 250000 }, + [ABP400KD] = { .min = -400000, .max = 400000 }, + /* psi variants (1 psi ~ 6895 Pa) */ + [ABP001PG] = { .min = 0, .max = 6985 }, + [ABP005PG] = { .min = 0, .max = 34474 }, + [ABP015PG] = { .min = 0, .max = 103421 }, + [ABP030PG] = { .min = 0, .max = 206843 }, + [ABP060PG] = { .min = 0, .max = 413686 }, + [ABP100PG] = { .min = 0, .max = 689476 }, + [ABP150PG] = { .min = 0, .max = 1034214 }, + [ABP001PD] = { .min = -6895, .max = 6895 }, + [ABP005PD] = { .min = -34474, .max = 34474 }, + [ABP015PD] = { .min = -103421, .max = 103421 }, + [ABP030PD] = { .min = -206843, .max = 206843 }, + [ABP060PD] = { .min = -413686, .max = 413686 }, +}; + +struct abp_state { + struct i2c_client *client; + struct mutex lock; + + /* + * bus-dependent MEASURE_REQUEST length. + * If no SMBUS_QUICK support, need to send dummy byte + */ + int mreq_len; + + /* model-dependent values (calculated on probe) */ + int scale; + int offset; +}; + +static const struct iio_chan_spec abp060mg_channels[] = { + { + .type = IIO_PRESSURE, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE), + }, +}; + +static int abp060mg_get_measurement(struct abp_state *state, int *val) +{ + struct i2c_client *client = state->client; + __be16 buf[2]; + u16 pressure; + int ret; + + buf[0] = 0; + ret = i2c_master_send(client, (u8 *)&buf, state->mreq_len); + if (ret < 0) + return ret; + + msleep_interruptible(ABP060MG_RESP_TIME_MS); + + ret = i2c_master_recv(client, (u8 *)&buf, sizeof(buf)); + if (ret < 0) + return ret; + + pressure = be16_to_cpu(buf[0]); + if (pressure & ABP060MG_ERROR_MASK) + return -EIO; + + if (pressure < ABP060MG_MIN_COUNTS || pressure > ABP060MG_MAX_COUNTS) + return -EIO; + + *val = pressure; + + return IIO_VAL_INT; +} + +static int abp060mg_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + struct abp_state *state = iio_priv(indio_dev); + int ret; + + mutex_lock(&state->lock); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = abp060mg_get_measurement(state, val); + break; + case IIO_CHAN_INFO_OFFSET: + *val = state->offset; + ret = IIO_VAL_INT; + break; + case IIO_CHAN_INFO_SCALE: + *val = state->scale; + *val2 = ABP060MG_NUM_COUNTS * 1000; /* to kPa */ + ret = IIO_VAL_FRACTIONAL; + break; + default: + ret = -EINVAL; + break; + } + + mutex_unlock(&state->lock); + return ret; +} + +static const struct iio_info abp060mg_info = { + .driver_module = THIS_MODULE, + .read_raw = abp060mg_read_raw, +}; + +static void abp060mg_init_device(struct iio_dev *indio_dev, unsigned long id) +{ + struct abp_state *state = iio_priv(indio_dev); + struct abp_config *cfg = &abp_config[id]; + + state->scale = cfg->max - cfg->min; + state->offset = -ABP060MG_MIN_COUNTS; + + if (cfg->min < 0) /* differential */ + state->offset -= ABP060MG_NUM_COUNTS >> 1; +} + +static int abp060mg_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct iio_dev *indio_dev; + struct abp_state *state; + unsigned long cfg_id = id->driver_data; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*state)); + if (!indio_dev) + return -ENOMEM; + + state = iio_priv(indio_dev); + i2c_set_clientdata(client, state); + state->client = client; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_QUICK)) + state->mreq_len = 1; + + abp060mg_init_device(indio_dev, cfg_id); + + indio_dev->dev.parent = &client->dev; + indio_dev->name = dev_name(&client->dev); + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &abp060mg_info; + + indio_dev->channels = abp060mg_channels; + indio_dev->num_channels = ARRAY_SIZE(abp060mg_channels); + + mutex_init(&state->lock); + + return devm_iio_device_register(&client->dev, indio_dev); +} + +static const struct i2c_device_id abp060mg_id_table[] = { + /* mbar & kPa variants (abp060m [60 mbar] == abp006k [6 kPa]) */ + /* gage: */ + { "abp060mg", ABP006KG }, { "abp006kg", ABP006KG }, + { "abp100mg", ABP010KG }, { "abp010kg", ABP010KG }, + { "abp160mg", ABP016KG }, { "abp016kg", ABP016KG }, + { "abp250mg", ABP025KG }, { "abp025kg", ABP025KG }, + { "abp400mg", ABP040KG }, { "abp040kg", ABP040KG }, + { "abp600mg", ABP060KG }, { "abp060kg", ABP060KG }, + { "abp001bg", ABP100KG }, { "abp100kg", ABP100KG }, + { "abp1_6bg", ABP160KG }, { "abp160kg", ABP160KG }, + { "abp2_5bg", ABP250KG }, { "abp250kg", ABP250KG }, + { "abp004bg", ABP400KG }, { "abp400kg", ABP400KG }, + { "abp006bg", ABP600KG }, { "abp600kg", ABP600KG }, + { "abp010bg", ABP001GG }, { "abp001gg", ABP001GG }, + /* differential: */ + { "abp060md", ABP006KD }, { "abp006kd", ABP006KD }, + { "abp100md", ABP010KD }, { "abp010kd", ABP010KD }, + { "abp160md", ABP016KD }, { "abp016kd", ABP016KD }, + { "abp250md", ABP025KD }, { "abp025kd", ABP025KD }, + { "abp400md", ABP040KD }, { "abp040kd", ABP040KD }, + { "abp600md", ABP060KD }, { "abp060kd", ABP060KD }, + { "abp001bd", ABP100KD }, { "abp100kd", ABP100KD }, + { "abp1_6bd", ABP160KD }, { "abp160kd", ABP160KD }, + { "abp2_5bd", ABP250KD }, { "abp250kd", ABP250KD }, + { "abp004bd", ABP400KD }, { "abp400kd", ABP400KD }, + /* psi variants */ + /* gage: */ + { "abp001pg", ABP001PG }, + { "abp005pg", ABP005PG }, + { "abp015pg", ABP015PG }, + { "abp030pg", ABP030PG }, + { "abp060pg", ABP060PG }, + { "abp100pg", ABP100PG }, + { "abp150pg", ABP150PG }, + /* differential: */ + { "abp001pd", ABP001PD }, + { "abp005pd", ABP005PD }, + { "abp015pd", ABP015PD }, + { "abp030pd", ABP030PD }, + { "abp060pd", ABP060PD }, + { /* empty */ }, +}; +MODULE_DEVICE_TABLE(i2c, abp060mg_id_table); + +static struct i2c_driver abp060mg_driver = { + .driver = { + .name = "abp060mg", + }, + .probe = abp060mg_probe, + .id_table = abp060mg_id_table, +}; +module_i2c_driver(abp060mg_driver); + +MODULE_AUTHOR("Marcin Malagowski <mrc@bourne.st>"); +MODULE_DESCRIPTION("Honeywell ABP pressure sensor driver"); +MODULE_LICENSE("GPL"); |