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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/iio/pressure/ms5611_i2c.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/iio/pressure/ms5611_i2c.c')
-rw-r--r--drivers/iio/pressure/ms5611_i2c.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/iio/pressure/ms5611_i2c.c b/drivers/iio/pressure/ms5611_i2c.c
new file mode 100644
index 000000000..b681a4183
--- /dev/null
+++ b/drivers/iio/pressure/ms5611_i2c.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MS5611 pressure and temperature sensor driver (I2C bus)
+ *
+ * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
+ *
+ * 7-bit I2C slave addresses:
+ *
+ * 0x77 (CSB pin low)
+ * 0x76 (CSB pin high)
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+
+#include <asm/unaligned.h>
+
+#include "ms5611.h"
+
+static int ms5611_i2c_reset(struct ms5611_state *st)
+{
+ return i2c_smbus_write_byte(st->client, MS5611_RESET);
+}
+
+static int ms5611_i2c_read_prom_word(struct ms5611_state *st, int index,
+ u16 *word)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_swapped(st->client,
+ MS5611_READ_PROM_WORD + (index << 1));
+ if (ret < 0)
+ return ret;
+
+ *word = ret;
+
+ return 0;
+}
+
+static int ms5611_i2c_read_adc(struct ms5611_state *st, s32 *val)
+{
+ int ret;
+ u8 buf[3];
+
+ ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC,
+ 3, buf);
+ if (ret < 0)
+ return ret;
+
+ *val = get_unaligned_be24(&buf[0]);
+
+ return 0;
+}
+
+static int ms5611_i2c_read_adc_temp_and_pressure(struct ms5611_state *st,
+ s32 *temp, s32 *pressure)
+{
+ int ret;
+ const struct ms5611_osr *osr = st->temp_osr;
+
+ ret = i2c_smbus_write_byte(st->client, osr->cmd);
+ if (ret < 0)
+ return ret;
+
+ usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
+ ret = ms5611_i2c_read_adc(st, temp);
+ if (ret < 0)
+ return ret;
+
+ osr = st->pressure_osr;
+ ret = i2c_smbus_write_byte(st->client, osr->cmd);
+ if (ret < 0)
+ return ret;
+
+ usleep_range(osr->conv_usec, osr->conv_usec + (osr->conv_usec / 10UL));
+ return ms5611_i2c_read_adc(st, pressure);
+}
+
+static int ms5611_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ms5611_state *st;
+ struct iio_dev *indio_dev;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WRITE_BYTE |
+ I2C_FUNC_SMBUS_READ_WORD_DATA |
+ I2C_FUNC_SMBUS_READ_I2C_BLOCK))
+ return -EOPNOTSUPP;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ st->reset = ms5611_i2c_reset;
+ st->read_prom_word = ms5611_i2c_read_prom_word;
+ st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure;
+ st->client = client;
+
+ return ms5611_probe(indio_dev, &client->dev, id->name, id->driver_data);
+}
+
+static void ms5611_i2c_remove(struct i2c_client *client)
+{
+ ms5611_remove(i2c_get_clientdata(client));
+}
+
+static const struct of_device_id ms5611_i2c_matches[] = {
+ { .compatible = "meas,ms5611" },
+ { .compatible = "meas,ms5607" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ms5611_i2c_matches);
+
+static const struct i2c_device_id ms5611_id[] = {
+ { "ms5611", MS5611 },
+ { "ms5607", MS5607 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ms5611_id);
+
+static struct i2c_driver ms5611_driver = {
+ .driver = {
+ .name = "ms5611",
+ .of_match_table = ms5611_i2c_matches,
+ },
+ .id_table = ms5611_id,
+ .probe = ms5611_i2c_probe,
+ .remove = ms5611_i2c_remove,
+};
+module_i2c_driver(ms5611_driver);
+
+MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
+MODULE_DESCRIPTION("MS5611 i2c driver");
+MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(IIO_MS5611);