// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2016 - Marcin Malagowski <mrc@bourne.st> */ #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 = { .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->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");