--- /dev/null
+/*
+ * 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");
projects / platform / kernel / linux-rpi3.git / commitdiff