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linux/drivers/iio/light/noa1305.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

313 lines
7.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
/*
* Support for ON Semiconductor NOA1305 ambient light sensor
*
* Copyright (C) 2016 Emcraft Systems
* Copyright (C) 2019 Collabora Ltd.
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#define NOA1305_REG_POWER_CONTROL 0x0
#define NOA1305_POWER_CONTROL_DOWN 0x00
#define NOA1305_POWER_CONTROL_ON 0x08
#define NOA1305_REG_RESET 0x1
#define NOA1305_RESET_RESET 0x10
#define NOA1305_REG_INTEGRATION_TIME 0x2
#define NOA1305_INTEGR_TIME_800MS 0x00
#define NOA1305_INTEGR_TIME_400MS 0x01
#define NOA1305_INTEGR_TIME_200MS 0x02
#define NOA1305_INTEGR_TIME_100MS 0x03
#define NOA1305_INTEGR_TIME_50MS 0x04
#define NOA1305_INTEGR_TIME_25MS 0x05
#define NOA1305_INTEGR_TIME_12_5MS 0x06
#define NOA1305_INTEGR_TIME_6_25MS 0x07
#define NOA1305_REG_INT_SELECT 0x3
#define NOA1305_INT_SEL_ACTIVE_HIGH 0x01
#define NOA1305_INT_SEL_ACTIVE_LOW 0x02
#define NOA1305_INT_SEL_INACTIVE 0x03
#define NOA1305_REG_INT_THRESH_LSB 0x4
#define NOA1305_REG_INT_THRESH_MSB 0x5
#define NOA1305_REG_ALS_DATA_LSB 0x6
#define NOA1305_REG_ALS_DATA_MSB 0x7
#define NOA1305_REG_DEVICE_ID_LSB 0x8
#define NOA1305_REG_DEVICE_ID_MSB 0x9
#define NOA1305_DEVICE_ID 0x0519
#define NOA1305_DRIVER_NAME "noa1305"
struct noa1305_priv {
struct i2c_client *client;
struct regmap *regmap;
struct regulator *vin_reg;
};
static int noa1305_measure(struct noa1305_priv *priv)
{
__le16 data;
int ret;
ret = regmap_bulk_read(priv->regmap, NOA1305_REG_ALS_DATA_LSB, &data,
2);
if (ret < 0)
return ret;
return le16_to_cpu(data);
}
static int noa1305_scale(struct noa1305_priv *priv, int *val, int *val2)
{
int data;
int ret;
ret = regmap_read(priv->regmap, NOA1305_REG_INTEGRATION_TIME, &data);
if (ret < 0)
return ret;
/*
* Lux = count / (<Integration Constant> * <Integration Time>)
*
* Integration Constant = 7.7
* Integration Time in Seconds
*/
switch (data) {
case NOA1305_INTEGR_TIME_800MS:
*val = 100;
*val2 = 77 * 8;
break;
case NOA1305_INTEGR_TIME_400MS:
*val = 100;
*val2 = 77 * 4;
break;
case NOA1305_INTEGR_TIME_200MS:
*val = 100;
*val2 = 77 * 2;
break;
case NOA1305_INTEGR_TIME_100MS:
*val = 100;
*val2 = 77;
break;
case NOA1305_INTEGR_TIME_50MS:
*val = 1000;
*val2 = 77 * 5;
break;
case NOA1305_INTEGR_TIME_25MS:
*val = 10000;
*val2 = 77 * 25;
break;
case NOA1305_INTEGR_TIME_12_5MS:
*val = 100000;
*val2 = 77 * 125;
break;
case NOA1305_INTEGR_TIME_6_25MS:
*val = 1000000;
*val2 = 77 * 625;
break;
default:
return -EINVAL;
}
return IIO_VAL_FRACTIONAL;
}
static const struct iio_chan_spec noa1305_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
}
};
static int noa1305_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
int ret = -EINVAL;
struct noa1305_priv *priv = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_LIGHT:
ret = noa1305_measure(priv);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
default:
break;
}
break;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_LIGHT:
return noa1305_scale(priv, val, val2);
default:
break;
}
break;
default:
break;
}
return ret;
}
static const struct iio_info noa1305_info = {
.read_raw = noa1305_read_raw,
};
static bool noa1305_writable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case NOA1305_REG_POWER_CONTROL:
case NOA1305_REG_RESET:
case NOA1305_REG_INTEGRATION_TIME:
case NOA1305_REG_INT_SELECT:
case NOA1305_REG_INT_THRESH_LSB:
case NOA1305_REG_INT_THRESH_MSB:
return true;
default:
return false;
}
}
static const struct regmap_config noa1305_regmap_config = {
.name = NOA1305_DRIVER_NAME,
.reg_bits = 8,
.val_bits = 8,
.max_register = NOA1305_REG_DEVICE_ID_MSB,
.writeable_reg = noa1305_writable_reg,
};
static void noa1305_reg_remove(void *data)
{
struct noa1305_priv *priv = data;
regulator_disable(priv->vin_reg);
}
static int noa1305_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct noa1305_priv *priv;
struct iio_dev *indio_dev;
struct regmap *regmap;
__le16 data;
unsigned int dev_id;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*priv));
if (!indio_dev)
return -ENOMEM;
regmap = devm_regmap_init_i2c(client, &noa1305_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "Regmap initialization failed.\n");
return PTR_ERR(regmap);
}
priv = iio_priv(indio_dev);
priv->vin_reg = devm_regulator_get(&client->dev, "vin");
if (IS_ERR(priv->vin_reg)) {
dev_err(&client->dev, "get regulator vin failed\n");
return PTR_ERR(priv->vin_reg);
}
ret = regulator_enable(priv->vin_reg);
if (ret) {
dev_err(&client->dev, "enable regulator vin failed\n");
return ret;
}
ret = devm_add_action_or_reset(&client->dev, noa1305_reg_remove, priv);
if (ret) {
dev_err(&client->dev, "addition of devm action failed\n");
return ret;
}
i2c_set_clientdata(client, indio_dev);
priv->client = client;
priv->regmap = regmap;
ret = regmap_bulk_read(regmap, NOA1305_REG_DEVICE_ID_LSB, &data, 2);
if (ret < 0) {
dev_err(&client->dev, "ID reading failed: %d\n", ret);
return ret;
}
dev_id = le16_to_cpu(data);
if (dev_id != NOA1305_DEVICE_ID) {
dev_err(&client->dev, "Unknown device ID: 0x%x\n", dev_id);
return -ENODEV;
}
ret = regmap_write(regmap, NOA1305_REG_POWER_CONTROL,
NOA1305_POWER_CONTROL_ON);
if (ret < 0) {
dev_err(&client->dev, "Enabling power control failed\n");
return ret;
}
ret = regmap_write(regmap, NOA1305_REG_RESET, NOA1305_RESET_RESET);
if (ret < 0) {
dev_err(&client->dev, "Device reset failed\n");
return ret;
}
ret = regmap_write(regmap, NOA1305_REG_INTEGRATION_TIME,
NOA1305_INTEGR_TIME_800MS);
if (ret < 0) {
dev_err(&client->dev, "Setting integration time failed\n");
return ret;
}
indio_dev->info = &noa1305_info;
indio_dev->channels = noa1305_channels;
indio_dev->num_channels = ARRAY_SIZE(noa1305_channels);
indio_dev->name = NOA1305_DRIVER_NAME;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = devm_iio_device_register(&client->dev, indio_dev);
if (ret)
dev_err(&client->dev, "registering device failed\n");
return ret;
}
static const struct of_device_id noa1305_of_match[] = {
{ .compatible = "onnn,noa1305" },
{ }
};
MODULE_DEVICE_TABLE(of, noa1305_of_match);
static const struct i2c_device_id noa1305_ids[] = {
{ "noa1305", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, noa1305_ids);
static struct i2c_driver noa1305_driver = {
.driver = {
.name = NOA1305_DRIVER_NAME,
.of_match_table = noa1305_of_match,
},
.probe = noa1305_probe,
.id_table = noa1305_ids,
};
module_i2c_driver(noa1305_driver);
MODULE_AUTHOR("Sergei Miroshnichenko <sergeimir@emcraft.com>");
MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.com");
MODULE_DESCRIPTION("ON Semiconductor NOA1305 ambient light sensor");
MODULE_LICENSE("GPL");
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