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![Alexandru Ardelean](/assets/img/avatar_default.png)
This patch applies the semantic patch: @@ expression I, P, SP; @@ I = devm_iio_device_alloc(P, SP); ... - I->dev.parent = P; It updates 302 files and does 307 deletions. This semantic patch also removes some comments like '/* Establish that the iio_dev is a child of the i2c device */' But this is is only done in case where the block is left empty. The patch does not seem to cover all cases. It looks like in some cases a different variable is used in some cases to assign the parent, but it points to the same reference. In other cases, the block covered by ... may be just too big to be covered by the semantic patch. However, this looks pretty good as well, as it does cover a big bulk of the drivers that should remove the parent assignment. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
157 lines
3.5 KiB
C
157 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for Linear Technology LTC2471 and LTC2473 voltage monitors
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* The LTC2473 is identical to the 2471, but reports a differential signal.
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*
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* Copyright (C) 2017 Topic Embedded Products
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* Author: Mike Looijmans <mike.looijmans@topic.nl>
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*/
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#include <linux/err.h>
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#include <linux/i2c.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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#include <linux/iio/sysfs.h>
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enum ltc2471_chips {
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ltc2471,
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ltc2473,
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};
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struct ltc2471_data {
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struct i2c_client *client;
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};
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/* Reference voltage is 1.25V */
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#define LTC2471_VREF 1250
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/* Read two bytes from the I2C bus to obtain the ADC result */
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static int ltc2471_get_value(struct i2c_client *client)
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{
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int ret;
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__be16 buf;
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ret = i2c_master_recv(client, (char *)&buf, sizeof(buf));
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if (ret < 0)
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return ret;
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if (ret != sizeof(buf))
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return -EIO;
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/* MSB first */
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return be16_to_cpu(buf);
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}
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static int ltc2471_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long info)
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{
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struct ltc2471_data *data = iio_priv(indio_dev);
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int ret;
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switch (info) {
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case IIO_CHAN_INFO_RAW:
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ret = ltc2471_get_value(data->client);
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if (ret < 0)
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return ret;
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*val = ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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if (chan->differential)
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/* Output ranges from -VREF to +VREF */
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*val = 2 * LTC2471_VREF;
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else
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/* Output ranges from 0 to VREF */
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*val = LTC2471_VREF;
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*val2 = 16; /* 16 data bits */
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return IIO_VAL_FRACTIONAL_LOG2;
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case IIO_CHAN_INFO_OFFSET:
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/* Only differential chip has this property */
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*val = -LTC2471_VREF;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_chan_spec ltc2471_channel[] = {
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{
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.type = IIO_VOLTAGE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
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},
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};
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static const struct iio_chan_spec ltc2473_channel[] = {
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{
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.type = IIO_VOLTAGE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OFFSET),
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.differential = 1,
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},
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};
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static const struct iio_info ltc2471_info = {
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.read_raw = ltc2471_read_raw,
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};
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static int ltc2471_i2c_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 ltc2471_data *data;
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int ret;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
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return -EOPNOTSUPP;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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data->client = client;
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indio_dev->name = id->name;
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indio_dev->info = <c2471_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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if (id->driver_data == ltc2473)
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indio_dev->channels = ltc2473_channel;
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else
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indio_dev->channels = ltc2471_channel;
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indio_dev->num_channels = 1;
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/* Trigger once to start conversion and check if chip is there */
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ret = ltc2471_get_value(client);
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if (ret < 0) {
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dev_err(&client->dev, "Cannot read from device.\n");
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return ret;
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}
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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 ltc2471_i2c_id[] = {
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{ "ltc2471", ltc2471 },
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{ "ltc2473", ltc2473 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ltc2471_i2c_id);
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static struct i2c_driver ltc2471_i2c_driver = {
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.driver = {
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.name = "ltc2471",
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},
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.probe = ltc2471_i2c_probe,
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.id_table = ltc2471_i2c_id,
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};
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module_i2c_driver(ltc2471_i2c_driver);
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MODULE_DESCRIPTION("LTC2471/LTC2473 ADC driver");
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MODULE_AUTHOR("Topic Embedded Products");
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MODULE_LICENSE("GPL v2");
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