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