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linux/drivers/iio/light/bh1780.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

297 lines
7.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/*
* ROHM 1780GLI Ambient Light Sensor Driver
*
* Copyright (C) 2016 Linaro Ltd.
* Author: Linus Walleij <linus.walleij@linaro.org>
* Loosely based on the previous BH1780 ALS misc driver
* Copyright (C) 2010 Texas Instruments
* Author: Hemanth V <hemanthv@ti.com>
*/
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/pm_runtime.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/bitops.h>
#define BH1780_CMD_BIT BIT(7)
#define BH1780_REG_CONTROL 0x00
#define BH1780_REG_PARTID 0x0A
#define BH1780_REG_MANFID 0x0B
#define BH1780_REG_DLOW 0x0C
#define BH1780_REG_DHIGH 0x0D
#define BH1780_REVMASK GENMASK(3,0)
#define BH1780_POWMASK GENMASK(1,0)
#define BH1780_POFF (0x0)
#define BH1780_PON (0x3)
/* power on settling time in ms */
#define BH1780_PON_DELAY 2
/* max time before value available in ms */
#define BH1780_INTERVAL 250
struct bh1780_data {
struct i2c_client *client;
};
static int bh1780_write(struct bh1780_data *bh1780, u8 reg, u8 val)
{
int ret = i2c_smbus_write_byte_data(bh1780->client,
BH1780_CMD_BIT | reg,
val);
if (ret < 0)
dev_err(&bh1780->client->dev,
"i2c_smbus_write_byte_data failed error "
"%d, register %01x\n",
ret, reg);
return ret;
}
static int bh1780_read(struct bh1780_data *bh1780, u8 reg)
{
int ret = i2c_smbus_read_byte_data(bh1780->client,
BH1780_CMD_BIT | reg);
if (ret < 0)
dev_err(&bh1780->client->dev,
"i2c_smbus_read_byte_data failed error "
"%d, register %01x\n",
ret, reg);
return ret;
}
static int bh1780_read_word(struct bh1780_data *bh1780, u8 reg)
{
int ret = i2c_smbus_read_word_data(bh1780->client,
BH1780_CMD_BIT | reg);
if (ret < 0)
dev_err(&bh1780->client->dev,
"i2c_smbus_read_word_data failed error "
"%d, register %01x\n",
ret, reg);
return ret;
}
static int bh1780_debugfs_reg_access(struct iio_dev *indio_dev,
unsigned int reg, unsigned int writeval,
unsigned int *readval)
{
struct bh1780_data *bh1780 = iio_priv(indio_dev);
int ret;
if (!readval)
return bh1780_write(bh1780, (u8)reg, (u8)writeval);
ret = bh1780_read(bh1780, (u8)reg);
if (ret < 0)
return ret;
*readval = ret;
return 0;
}
static int bh1780_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct bh1780_data *bh1780 = iio_priv(indio_dev);
int value;
switch (mask) {
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_LIGHT:
pm_runtime_get_sync(&bh1780->client->dev);
value = bh1780_read_word(bh1780, BH1780_REG_DLOW);
if (value < 0)
return value;
pm_runtime_mark_last_busy(&bh1780->client->dev);
pm_runtime_put_autosuspend(&bh1780->client->dev);
*val = value;
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_INT_TIME:
*val = 0;
*val2 = BH1780_INTERVAL * 1000;
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
}
static const struct iio_info bh1780_info = {
.read_raw = bh1780_read_raw,
.debugfs_reg_access = bh1780_debugfs_reg_access,
};
static const struct iio_chan_spec bh1780_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME)
}
};
static int bh1780_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
struct bh1780_data *bh1780;
struct i2c_adapter *adapter = client->adapter;
struct iio_dev *indio_dev;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
return -EIO;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*bh1780));
if (!indio_dev)
return -ENOMEM;
bh1780 = iio_priv(indio_dev);
bh1780->client = client;
i2c_set_clientdata(client, indio_dev);
/* Power up the device */
ret = bh1780_write(bh1780, BH1780_REG_CONTROL, BH1780_PON);
if (ret < 0)
return ret;
msleep(BH1780_PON_DELAY);
pm_runtime_get_noresume(&client->dev);
pm_runtime_set_active(&client->dev);
pm_runtime_enable(&client->dev);
ret = bh1780_read(bh1780, BH1780_REG_PARTID);
if (ret < 0)
goto out_disable_pm;
dev_info(&client->dev,
"Ambient Light Sensor, Rev : %lu\n",
(ret & BH1780_REVMASK));
/*
* As the device takes 250 ms to even come up with a fresh
* measurement after power-on, do not shut it down unnecessarily.
* Set autosuspend to a five seconds.
*/
pm_runtime_set_autosuspend_delay(&client->dev, 5000);
pm_runtime_use_autosuspend(&client->dev);
pm_runtime_put(&client->dev);
indio_dev->info = &bh1780_info;
indio_dev->name = "bh1780";
indio_dev->channels = bh1780_channels;
indio_dev->num_channels = ARRAY_SIZE(bh1780_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
ret = iio_device_register(indio_dev);
if (ret)
goto out_disable_pm;
return 0;
out_disable_pm:
pm_runtime_put_noidle(&client->dev);
pm_runtime_disable(&client->dev);
return ret;
}
static int bh1780_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct bh1780_data *bh1780 = iio_priv(indio_dev);
int ret;
iio_device_unregister(indio_dev);
pm_runtime_get_sync(&client->dev);
pm_runtime_put_noidle(&client->dev);
pm_runtime_disable(&client->dev);
ret = bh1780_write(bh1780, BH1780_REG_CONTROL, BH1780_POFF);
if (ret < 0) {
dev_err(&client->dev, "failed to power off\n");
return ret;
}
return 0;
}
#ifdef CONFIG_PM
static int bh1780_runtime_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct bh1780_data *bh1780 = iio_priv(indio_dev);
int ret;
ret = bh1780_write(bh1780, BH1780_REG_CONTROL, BH1780_POFF);
if (ret < 0) {
dev_err(dev, "failed to runtime suspend\n");
return ret;
}
return 0;
}
static int bh1780_runtime_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct bh1780_data *bh1780 = iio_priv(indio_dev);
int ret;
ret = bh1780_write(bh1780, BH1780_REG_CONTROL, BH1780_PON);
if (ret < 0) {
dev_err(dev, "failed to runtime resume\n");
return ret;
}
/* Wait for power on, then for a value to be available */
msleep(BH1780_PON_DELAY + BH1780_INTERVAL);
return 0;
}
#endif /* CONFIG_PM */
static const struct dev_pm_ops bh1780_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(bh1780_runtime_suspend,
bh1780_runtime_resume, NULL)
};
static const struct i2c_device_id bh1780_id[] = {
{ "bh1780", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, bh1780_id);
static const struct of_device_id of_bh1780_match[] = {
{ .compatible = "rohm,bh1780gli", },
{},
};
MODULE_DEVICE_TABLE(of, of_bh1780_match);
static struct i2c_driver bh1780_driver = {
.probe = bh1780_probe,
.remove = bh1780_remove,
.id_table = bh1780_id,
.driver = {
.name = "bh1780",
.pm = &bh1780_dev_pm_ops,
.of_match_table = of_bh1780_match,
},
};
module_i2c_driver(bh1780_driver);
MODULE_DESCRIPTION("ROHM BH1780GLI Ambient Light Sensor Driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
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