Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Mike Looijmans | 566 | 98.09% | 1 | 33.33% |
Uwe Kleine-König | 9 | 1.56% | 1 | 33.33% |
Thomas Gleixner | 2 | 0.35% | 1 | 33.33% |
Total | 577 | 3 |
// SPDX-License-Identifier: GPL-2.0-only /* * Driver for Linear Technology LTC2471 and LTC2473 voltage monitors * The LTC2473 is identical to the 2471, but reports a differential signal. * * Copyright (C) 2017 Topic Embedded Products * Author: Mike Looijmans <mike.looijmans@topic.nl> */ #include <linux/err.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> enum ltc2471_chips { ltc2471, ltc2473, }; struct ltc2471_data { struct i2c_client *client; }; /* Reference voltage is 1.25V */ #define LTC2471_VREF 1250 /* Read two bytes from the I2C bus to obtain the ADC result */ static int ltc2471_get_value(struct i2c_client *client) { int ret; __be16 buf; ret = i2c_master_recv(client, (char *)&buf, sizeof(buf)); if (ret < 0) return ret; if (ret != sizeof(buf)) return -EIO; /* MSB first */ return be16_to_cpu(buf); } static int ltc2471_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long info) { struct ltc2471_data *data = iio_priv(indio_dev); int ret; switch (info) { case IIO_CHAN_INFO_RAW: ret = ltc2471_get_value(data->client); if (ret < 0) return ret; *val = ret; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: if (chan->differential) /* Output ranges from -VREF to +VREF */ *val = 2 * LTC2471_VREF; else /* Output ranges from 0 to VREF */ *val = LTC2471_VREF; *val2 = 16; /* 16 data bits */ return IIO_VAL_FRACTIONAL_LOG2; case IIO_CHAN_INFO_OFFSET: /* Only differential chip has this property */ *val = -LTC2471_VREF; return IIO_VAL_INT; default: return -EINVAL; } } static const struct iio_chan_spec ltc2471_channel[] = { { .type = IIO_VOLTAGE, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), }, }; static const struct iio_chan_spec ltc2473_channel[] = { { .type = IIO_VOLTAGE, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET), .differential = 1, }, }; static const struct iio_info ltc2471_info = { .read_raw = ltc2471_read_raw, }; static int ltc2471_i2c_probe(struct i2c_client *client) { const struct i2c_device_id *id = i2c_client_get_device_id(client); struct iio_dev *indio_dev; struct ltc2471_data *data; int ret; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) return -EOPNOTSUPP; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!indio_dev) return -ENOMEM; data = iio_priv(indio_dev); data->client = client; indio_dev->name = id->name; indio_dev->info = <c2471_info; indio_dev->modes = INDIO_DIRECT_MODE; if (id->driver_data == ltc2473) indio_dev->channels = ltc2473_channel; else indio_dev->channels = ltc2471_channel; indio_dev->num_channels = 1; /* Trigger once to start conversion and check if chip is there */ ret = ltc2471_get_value(client); if (ret < 0) { dev_err(&client->dev, "Cannot read from device.\n"); return ret; } return devm_iio_device_register(&client->dev, indio_dev); } static const struct i2c_device_id ltc2471_i2c_id[] = { { "ltc2471", ltc2471 }, { "ltc2473", ltc2473 }, {} }; MODULE_DEVICE_TABLE(i2c, ltc2471_i2c_id); static struct i2c_driver ltc2471_i2c_driver = { .driver = { .name = "ltc2471", }, .probe_new = ltc2471_i2c_probe, .id_table = ltc2471_i2c_id, }; module_i2c_driver(ltc2471_i2c_driver); MODULE_DESCRIPTION("LTC2471/LTC2473 ADC driver"); MODULE_AUTHOR("Topic Embedded Products"); MODULE_LICENSE("GPL v2");
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