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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>
280 lines
6.4 KiB
C
280 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/**
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* Freescale MMA7660FC 3-Axis Accelerometer
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*
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* Copyright (c) 2016, Intel Corporation.
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*
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* IIO driver for Freescale MMA7660FC; 7-bit I2C address: 0x4c.
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*/
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#include <linux/acpi.h>
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#include <linux/i2c.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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#define MMA7660_DRIVER_NAME "mma7660"
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#define MMA7660_REG_XOUT 0x00
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#define MMA7660_REG_YOUT 0x01
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#define MMA7660_REG_ZOUT 0x02
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#define MMA7660_REG_OUT_BIT_ALERT BIT(6)
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#define MMA7660_REG_MODE 0x07
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#define MMA7660_REG_MODE_BIT_MODE BIT(0)
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#define MMA7660_REG_MODE_BIT_TON BIT(2)
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#define MMA7660_I2C_READ_RETRIES 5
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/*
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* The accelerometer has one measurement range:
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*
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* -1.5g - +1.5g (6-bit, signed)
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*
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* scale = (1.5 + 1.5) * 9.81 / (2^6 - 1) = 0.467142857
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*/
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#define MMA7660_SCALE_AVAIL "0.467142857"
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static const int mma7660_nscale = 467142857;
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#define MMA7660_CHANNEL(reg, axis) { \
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.type = IIO_ACCEL, \
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.address = reg, \
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.modified = 1, \
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.channel2 = IIO_MOD_##axis, \
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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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static const struct iio_chan_spec mma7660_channels[] = {
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MMA7660_CHANNEL(MMA7660_REG_XOUT, X),
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MMA7660_CHANNEL(MMA7660_REG_YOUT, Y),
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MMA7660_CHANNEL(MMA7660_REG_ZOUT, Z),
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};
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enum mma7660_mode {
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MMA7660_MODE_STANDBY,
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MMA7660_MODE_ACTIVE
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};
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struct mma7660_data {
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struct i2c_client *client;
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struct mutex lock;
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enum mma7660_mode mode;
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};
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static IIO_CONST_ATTR(in_accel_scale_available, MMA7660_SCALE_AVAIL);
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static struct attribute *mma7660_attributes[] = {
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&iio_const_attr_in_accel_scale_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group mma7660_attribute_group = {
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.attrs = mma7660_attributes
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};
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static int mma7660_set_mode(struct mma7660_data *data,
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enum mma7660_mode mode)
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{
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int ret;
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struct i2c_client *client = data->client;
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if (mode == data->mode)
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return 0;
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ret = i2c_smbus_read_byte_data(client, MMA7660_REG_MODE);
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if (ret < 0) {
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dev_err(&client->dev, "failed to read sensor mode\n");
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return ret;
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}
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if (mode == MMA7660_MODE_ACTIVE) {
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ret &= ~MMA7660_REG_MODE_BIT_TON;
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ret |= MMA7660_REG_MODE_BIT_MODE;
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} else {
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ret &= ~MMA7660_REG_MODE_BIT_TON;
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ret &= ~MMA7660_REG_MODE_BIT_MODE;
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}
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ret = i2c_smbus_write_byte_data(client, MMA7660_REG_MODE, ret);
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if (ret < 0) {
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dev_err(&client->dev, "failed to change sensor mode\n");
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return ret;
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}
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data->mode = mode;
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return ret;
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}
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static int mma7660_read_accel(struct mma7660_data *data, u8 address)
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{
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int ret, retries = MMA7660_I2C_READ_RETRIES;
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struct i2c_client *client = data->client;
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/*
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* Read data. If the Alert bit is set, the register was read at
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* the same time as the device was attempting to update the content.
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* The solution is to read the register again. Do this only
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* MMA7660_I2C_READ_RETRIES times to avoid spending too much time
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* in the kernel.
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*/
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do {
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ret = i2c_smbus_read_byte_data(client, address);
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if (ret < 0) {
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dev_err(&client->dev, "register read failed\n");
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return ret;
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}
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} while (retries-- > 0 && ret & MMA7660_REG_OUT_BIT_ALERT);
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if (ret & MMA7660_REG_OUT_BIT_ALERT) {
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dev_err(&client->dev, "all register read retries failed\n");
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return -ETIMEDOUT;
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}
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return ret;
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}
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static int mma7660_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 mask)
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{
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struct mma7660_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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mutex_lock(&data->lock);
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ret = mma7660_read_accel(data, chan->address);
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mutex_unlock(&data->lock);
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if (ret < 0)
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return ret;
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*val = sign_extend32(ret, 5);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = mma7660_nscale;
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return IIO_VAL_INT_PLUS_NANO;
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default:
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return -EINVAL;
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}
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return -EINVAL;
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}
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static const struct iio_info mma7660_info = {
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.read_raw = mma7660_read_raw,
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.attrs = &mma7660_attribute_group,
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};
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static int mma7660_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct iio_dev *indio_dev;
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struct mma7660_data *data;
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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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dev_err(&client->dev, "iio allocation failed!\n");
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return -ENOMEM;
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}
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data = iio_priv(indio_dev);
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data->client = client;
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i2c_set_clientdata(client, indio_dev);
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mutex_init(&data->lock);
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data->mode = MMA7660_MODE_STANDBY;
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indio_dev->info = &mma7660_info;
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indio_dev->name = MMA7660_DRIVER_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = mma7660_channels;
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indio_dev->num_channels = ARRAY_SIZE(mma7660_channels);
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ret = mma7660_set_mode(data, MMA7660_MODE_ACTIVE);
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if (ret < 0)
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return ret;
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ret = iio_device_register(indio_dev);
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if (ret < 0) {
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dev_err(&client->dev, "device_register failed\n");
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mma7660_set_mode(data, MMA7660_MODE_STANDBY);
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}
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return ret;
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}
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static int mma7660_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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iio_device_unregister(indio_dev);
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return mma7660_set_mode(iio_priv(indio_dev), MMA7660_MODE_STANDBY);
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}
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#ifdef CONFIG_PM_SLEEP
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static int mma7660_suspend(struct device *dev)
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{
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struct mma7660_data *data;
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data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
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return mma7660_set_mode(data, MMA7660_MODE_STANDBY);
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}
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static int mma7660_resume(struct device *dev)
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{
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struct mma7660_data *data;
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data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
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return mma7660_set_mode(data, MMA7660_MODE_ACTIVE);
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}
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static SIMPLE_DEV_PM_OPS(mma7660_pm_ops, mma7660_suspend, mma7660_resume);
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#define MMA7660_PM_OPS (&mma7660_pm_ops)
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#else
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#define MMA7660_PM_OPS NULL
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#endif
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static const struct i2c_device_id mma7660_i2c_id[] = {
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{"mma7660", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, mma7660_i2c_id);
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static const struct of_device_id mma7660_of_match[] = {
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{ .compatible = "fsl,mma7660" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, mma7660_of_match);
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static const struct acpi_device_id mma7660_acpi_id[] = {
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{"MMA7660", 0},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, mma7660_acpi_id);
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static struct i2c_driver mma7660_driver = {
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.driver = {
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.name = "mma7660",
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.pm = MMA7660_PM_OPS,
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.of_match_table = mma7660_of_match,
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.acpi_match_table = ACPI_PTR(mma7660_acpi_id),
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},
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.probe = mma7660_probe,
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.remove = mma7660_remove,
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.id_table = mma7660_i2c_id,
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};
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module_i2c_driver(mma7660_driver);
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MODULE_AUTHOR("Constantin Musca <constantin.musca@intel.com>");
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MODULE_DESCRIPTION("Freescale MMA7660FC 3-Axis Accelerometer driver");
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MODULE_LICENSE("GPL v2");
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