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linux/drivers/iio/accel/da311.c
Alexandru Ardelean d3be83244c iio: remove explicit IIO device parent assignment 
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>
2020-06-14 11:49:59 +01:00

301 lines
7.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/**
* IIO driver for the MiraMEMS DA311 3-axis accelerometer
*
* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
* Copyright (c) 2011-2013 MiraMEMS Sensing Technology Co., Ltd.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/byteorder/generic.h>
#define DA311_CHIP_ID 0x13
/*
* Note register addressed go from 0 - 0x3f and then wrap.
* For some reason there are 2 banks with 0 - 0x3f addresses,
* rather then a single 0-0x7f bank.
*/
/* Bank 0 regs */
#define DA311_REG_BANK 0x0000
#define DA311_REG_LDO_REG 0x0006
#define DA311_REG_CHIP_ID 0x000f
#define DA311_REG_TEMP_CFG_REG 0x001f
#define DA311_REG_CTRL_REG1 0x0020
#define DA311_REG_CTRL_REG3 0x0022
#define DA311_REG_CTRL_REG4 0x0023
#define DA311_REG_CTRL_REG5 0x0024
#define DA311_REG_CTRL_REG6 0x0025
#define DA311_REG_STATUS_REG 0x0027
#define DA311_REG_OUT_X_L 0x0028
#define DA311_REG_OUT_X_H 0x0029
#define DA311_REG_OUT_Y_L 0x002a
#define DA311_REG_OUT_Y_H 0x002b
#define DA311_REG_OUT_Z_L 0x002c
#define DA311_REG_OUT_Z_H 0x002d
#define DA311_REG_INT1_CFG 0x0030
#define DA311_REG_INT1_SRC 0x0031
#define DA311_REG_INT1_THS 0x0032
#define DA311_REG_INT1_DURATION 0x0033
#define DA311_REG_INT2_CFG 0x0034
#define DA311_REG_INT2_SRC 0x0035
#define DA311_REG_INT2_THS 0x0036
#define DA311_REG_INT2_DURATION 0x0037
#define DA311_REG_CLICK_CFG 0x0038
#define DA311_REG_CLICK_SRC 0x0039
#define DA311_REG_CLICK_THS 0x003a
#define DA311_REG_TIME_LIMIT 0x003b
#define DA311_REG_TIME_LATENCY 0x003c
#define DA311_REG_TIME_WINDOW 0x003d
/* Bank 1 regs */
#define DA311_REG_SOFT_RESET 0x0105
#define DA311_REG_OTP_XOFF_L 0x0110
#define DA311_REG_OTP_XOFF_H 0x0111
#define DA311_REG_OTP_YOFF_L 0x0112
#define DA311_REG_OTP_YOFF_H 0x0113
#define DA311_REG_OTP_ZOFF_L 0x0114
#define DA311_REG_OTP_ZOFF_H 0x0115
#define DA311_REG_OTP_XSO 0x0116
#define DA311_REG_OTP_YSO 0x0117
#define DA311_REG_OTP_ZSO 0x0118
#define DA311_REG_OTP_TRIM_OSC 0x011b
#define DA311_REG_LPF_ABSOLUTE 0x011c
#define DA311_REG_TEMP_OFF1 0x0127
#define DA311_REG_TEMP_OFF2 0x0128
#define DA311_REG_TEMP_OFF3 0x0129
#define DA311_REG_OTP_TRIM_THERM_H 0x011a
/*
* a value of + or -1024 corresponds to + or - 1G
* scale = 9.81 / 1024 = 0.009580078
*/
static const int da311_nscale = 9580078;
#define DA311_CHANNEL(reg, axis) { \
.type = IIO_ACCEL, \
.address = reg, \
.modified = 1, \
.channel2 = IIO_MOD_##axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
}
static const struct iio_chan_spec da311_channels[] = {
/* | 0x80 comes from the android driver */
DA311_CHANNEL(DA311_REG_OUT_X_L | 0x80, X),
DA311_CHANNEL(DA311_REG_OUT_Y_L | 0x80, Y),
DA311_CHANNEL(DA311_REG_OUT_Z_L | 0x80, Z),
};
struct da311_data {
struct i2c_client *client;
};
static int da311_register_mask_write(struct i2c_client *client, u16 addr,
u8 mask, u8 data)
{
int ret;
u8 tmp_data = 0;
if (addr & 0xff00) {
/* Select bank 1 */
ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x01);
if (ret < 0)
return ret;
}
if (mask != 0xff) {
ret = i2c_smbus_read_byte_data(client, addr);
if (ret < 0)
return ret;
tmp_data = ret;
}
tmp_data &= ~mask;
tmp_data |= data & mask;
ret = i2c_smbus_write_byte_data(client, addr & 0xff, tmp_data);
if (ret < 0)
return ret;
if (addr & 0xff00) {
/* Back to bank 0 */
ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x00);
if (ret < 0)
return ret;
}
return 0;
}
/* Init sequence taken from the android driver */
static int da311_reset(struct i2c_client *client)
{
static const struct {
u16 addr;
u8 mask;
u8 data;
} init_data[] = {
{ DA311_REG_TEMP_CFG_REG, 0xff, 0x08 },
{ DA311_REG_CTRL_REG5, 0xff, 0x80 },
{ DA311_REG_CTRL_REG4, 0x30, 0x00 },
{ DA311_REG_CTRL_REG1, 0xff, 0x6f },
{ DA311_REG_TEMP_CFG_REG, 0xff, 0x88 },
{ DA311_REG_LDO_REG, 0xff, 0x02 },
{ DA311_REG_OTP_TRIM_OSC, 0xff, 0x27 },
{ DA311_REG_LPF_ABSOLUTE, 0xff, 0x30 },
{ DA311_REG_TEMP_OFF1, 0xff, 0x3f },
{ DA311_REG_TEMP_OFF2, 0xff, 0xff },
{ DA311_REG_TEMP_OFF3, 0xff, 0x0f },
};
int i, ret;
/* Reset */
ret = da311_register_mask_write(client, DA311_REG_SOFT_RESET,
0xff, 0xaa);
if (ret < 0)
return ret;
for (i = 0; i < ARRAY_SIZE(init_data); i++) {
ret = da311_register_mask_write(client,
init_data[i].addr,
init_data[i].mask,
init_data[i].data);
if (ret < 0)
return ret;
}
return 0;
}
static int da311_enable(struct i2c_client *client, bool enable)
{
u8 data = enable ? 0x00 : 0x20;
return da311_register_mask_write(client, DA311_REG_TEMP_CFG_REG,
0x20, data);
}
static int da311_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct da311_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = i2c_smbus_read_word_data(data->client, chan->address);
if (ret < 0)
return ret;
/*
* Values are 12 bits, stored as 16 bits with the 4
* least significant bits always 0.
*/
*val = (short)ret >> 4;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 0;
*val2 = da311_nscale;
return IIO_VAL_INT_PLUS_NANO;
default:
return -EINVAL;
}
}
static const struct iio_info da311_info = {
.read_raw = da311_read_raw,
};
static int da311_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
struct iio_dev *indio_dev;
struct da311_data *data;
ret = i2c_smbus_read_byte_data(client, DA311_REG_CHIP_ID);
if (ret != DA311_CHIP_ID)
return (ret < 0) ? ret : -ENODEV;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
data->client = client;
i2c_set_clientdata(client, indio_dev);
indio_dev->info = &da311_info;
indio_dev->name = "da311";
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = da311_channels;
indio_dev->num_channels = ARRAY_SIZE(da311_channels);
ret = da311_reset(client);
if (ret < 0)
return ret;
ret = da311_enable(client, true);
if (ret < 0)
return ret;
ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(&client->dev, "device_register failed\n");
da311_enable(client, false);
}
return ret;
}
static int da311_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
iio_device_unregister(indio_dev);
return da311_enable(client, false);
}
#ifdef CONFIG_PM_SLEEP
static int da311_suspend(struct device *dev)
{
return da311_enable(to_i2c_client(dev), false);
}
static int da311_resume(struct device *dev)
{
return da311_enable(to_i2c_client(dev), true);
}
#endif
static SIMPLE_DEV_PM_OPS(da311_pm_ops, da311_suspend, da311_resume);
static const struct i2c_device_id da311_i2c_id[] = {
{"da311", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, da311_i2c_id);
static struct i2c_driver da311_driver = {
.driver = {
.name = "da311",
.pm = &da311_pm_ops,
},
.probe = da311_probe,
.remove = da311_remove,
.id_table = da311_i2c_id,
};
module_i2c_driver(da311_driver);
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("MiraMEMS DA311 3-Axis Accelerometer driver");
MODULE_LICENSE("GPL v2");
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