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linux/drivers/iio/light/lv0104cs.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

531 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* lv0104cs.c: LV0104CS Ambient Light Sensor Driver
*
* Copyright (C) 2018
* Author: Jeff LaBundy <jeff@labundy.com>
*
* 7-bit I2C slave address: 0x13
*
* Link to data sheet: http://www.onsemi.com/pub/Collateral/LV0104CS-D.PDF
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#define LV0104CS_REGVAL_MEASURE 0xE0
#define LV0104CS_REGVAL_SLEEP 0x00
#define LV0104CS_SCALE_0_25X 0
#define LV0104CS_SCALE_1X 1
#define LV0104CS_SCALE_2X 2
#define LV0104CS_SCALE_8X 3
#define LV0104CS_SCALE_SHIFT 3
#define LV0104CS_INTEG_12_5MS 0
#define LV0104CS_INTEG_100MS 1
#define LV0104CS_INTEG_200MS 2
#define LV0104CS_INTEG_SHIFT 1
#define LV0104CS_CALIBSCALE_UNITY 31
struct lv0104cs_private {
struct i2c_client *client;
struct mutex lock;
u8 calibscale;
u8 scale;
u8 int_time;
};
struct lv0104cs_mapping {
int val;
int val2;
u8 regval;
};
static const struct lv0104cs_mapping lv0104cs_calibscales[] = {
{ 0, 666666, 0x81 },
{ 0, 800000, 0x82 },
{ 0, 857142, 0x83 },
{ 0, 888888, 0x84 },
{ 0, 909090, 0x85 },
{ 0, 923076, 0x86 },
{ 0, 933333, 0x87 },
{ 0, 941176, 0x88 },
{ 0, 947368, 0x89 },
{ 0, 952380, 0x8A },
{ 0, 956521, 0x8B },
{ 0, 960000, 0x8C },
{ 0, 962962, 0x8D },
{ 0, 965517, 0x8E },
{ 0, 967741, 0x8F },
{ 0, 969696, 0x90 },
{ 0, 971428, 0x91 },
{ 0, 972972, 0x92 },
{ 0, 974358, 0x93 },
{ 0, 975609, 0x94 },
{ 0, 976744, 0x95 },
{ 0, 977777, 0x96 },
{ 0, 978723, 0x97 },
{ 0, 979591, 0x98 },
{ 0, 980392, 0x99 },
{ 0, 981132, 0x9A },
{ 0, 981818, 0x9B },
{ 0, 982456, 0x9C },
{ 0, 983050, 0x9D },
{ 0, 983606, 0x9E },
{ 0, 984126, 0x9F },
{ 1, 0, 0x80 },
{ 1, 16129, 0xBF },
{ 1, 16666, 0xBE },
{ 1, 17241, 0xBD },
{ 1, 17857, 0xBC },
{ 1, 18518, 0xBB },
{ 1, 19230, 0xBA },
{ 1, 20000, 0xB9 },
{ 1, 20833, 0xB8 },
{ 1, 21739, 0xB7 },
{ 1, 22727, 0xB6 },
{ 1, 23809, 0xB5 },
{ 1, 24999, 0xB4 },
{ 1, 26315, 0xB3 },
{ 1, 27777, 0xB2 },
{ 1, 29411, 0xB1 },
{ 1, 31250, 0xB0 },
{ 1, 33333, 0xAF },
{ 1, 35714, 0xAE },
{ 1, 38461, 0xAD },
{ 1, 41666, 0xAC },
{ 1, 45454, 0xAB },
{ 1, 50000, 0xAA },
{ 1, 55555, 0xA9 },
{ 1, 62500, 0xA8 },
{ 1, 71428, 0xA7 },
{ 1, 83333, 0xA6 },
{ 1, 100000, 0xA5 },
{ 1, 125000, 0xA4 },
{ 1, 166666, 0xA3 },
{ 1, 250000, 0xA2 },
{ 1, 500000, 0xA1 },
};
static const struct lv0104cs_mapping lv0104cs_scales[] = {
{ 0, 250000, LV0104CS_SCALE_0_25X << LV0104CS_SCALE_SHIFT },
{ 1, 0, LV0104CS_SCALE_1X << LV0104CS_SCALE_SHIFT },
{ 2, 0, LV0104CS_SCALE_2X << LV0104CS_SCALE_SHIFT },
{ 8, 0, LV0104CS_SCALE_8X << LV0104CS_SCALE_SHIFT },
};
static const struct lv0104cs_mapping lv0104cs_int_times[] = {
{ 0, 12500, LV0104CS_INTEG_12_5MS << LV0104CS_INTEG_SHIFT },
{ 0, 100000, LV0104CS_INTEG_100MS << LV0104CS_INTEG_SHIFT },
{ 0, 200000, LV0104CS_INTEG_200MS << LV0104CS_INTEG_SHIFT },
};
static int lv0104cs_write_reg(struct i2c_client *client, u8 regval)
{
int ret;
ret = i2c_master_send(client, (char *)&regval, sizeof(regval));
if (ret < 0)
return ret;
if (ret != sizeof(regval))
return -EIO;
return 0;
}
static int lv0104cs_read_adc(struct i2c_client *client, u16 *adc_output)
{
__be16 regval;
int ret;
ret = i2c_master_recv(client, (char *)&regval, sizeof(regval));
if (ret < 0)
return ret;
if (ret != sizeof(regval))
return -EIO;
*adc_output = be16_to_cpu(regval);
return 0;
}
static int lv0104cs_get_lux(struct lv0104cs_private *lv0104cs,
int *val, int *val2)
{
u8 regval = LV0104CS_REGVAL_MEASURE;
u16 adc_output;
int ret;
regval |= lv0104cs_scales[lv0104cs->scale].regval;
regval |= lv0104cs_int_times[lv0104cs->int_time].regval;
ret = lv0104cs_write_reg(lv0104cs->client, regval);
if (ret)
return ret;
/* wait for integration time to pass (with margin) */
switch (lv0104cs->int_time) {
case LV0104CS_INTEG_12_5MS:
msleep(50);
break;
case LV0104CS_INTEG_100MS:
msleep(150);
break;
case LV0104CS_INTEG_200MS:
msleep(250);
break;
default:
return -EINVAL;
}
ret = lv0104cs_read_adc(lv0104cs->client, &adc_output);
if (ret)
return ret;
ret = lv0104cs_write_reg(lv0104cs->client, LV0104CS_REGVAL_SLEEP);
if (ret)
return ret;
/* convert ADC output to lux */
switch (lv0104cs->scale) {
case LV0104CS_SCALE_0_25X:
*val = adc_output * 4;
*val2 = 0;
return 0;
case LV0104CS_SCALE_1X:
*val = adc_output;
*val2 = 0;
return 0;
case LV0104CS_SCALE_2X:
*val = adc_output / 2;
*val2 = (adc_output % 2) * 500000;
return 0;
case LV0104CS_SCALE_8X:
*val = adc_output / 8;
*val2 = (adc_output % 8) * 125000;
return 0;
default:
return -EINVAL;
}
}
static int lv0104cs_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct lv0104cs_private *lv0104cs = iio_priv(indio_dev);
int ret;
if (chan->type != IIO_LIGHT)
return -EINVAL;
mutex_lock(&lv0104cs->lock);
switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
ret = lv0104cs_get_lux(lv0104cs, val, val2);
if (ret)
goto err_mutex;
ret = IIO_VAL_INT_PLUS_MICRO;
break;
case IIO_CHAN_INFO_CALIBSCALE:
*val = lv0104cs_calibscales[lv0104cs->calibscale].val;
*val2 = lv0104cs_calibscales[lv0104cs->calibscale].val2;
ret = IIO_VAL_INT_PLUS_MICRO;
break;
case IIO_CHAN_INFO_SCALE:
*val = lv0104cs_scales[lv0104cs->scale].val;
*val2 = lv0104cs_scales[lv0104cs->scale].val2;
ret = IIO_VAL_INT_PLUS_MICRO;
break;
case IIO_CHAN_INFO_INT_TIME:
*val = lv0104cs_int_times[lv0104cs->int_time].val;
*val2 = lv0104cs_int_times[lv0104cs->int_time].val2;
ret = IIO_VAL_INT_PLUS_MICRO;
break;
default:
ret = -EINVAL;
}
err_mutex:
mutex_unlock(&lv0104cs->lock);
return ret;
}
static int lv0104cs_set_calibscale(struct lv0104cs_private *lv0104cs,
int val, int val2)
{
int calibscale = val * 1000000 + val2;
int floor, ceil, mid;
int ret, i, index;
/* round to nearest quantized calibscale (sensitivity) */
for (i = 0; i < ARRAY_SIZE(lv0104cs_calibscales) - 1; i++) {
floor = lv0104cs_calibscales[i].val * 1000000
+ lv0104cs_calibscales[i].val2;
ceil = lv0104cs_calibscales[i + 1].val * 1000000
+ lv0104cs_calibscales[i + 1].val2;
mid = (floor + ceil) / 2;
/* round down */
if (calibscale >= floor && calibscale < mid) {
index = i;
break;
}
/* round up */
if (calibscale >= mid && calibscale <= ceil) {
index = i + 1;
break;
}
}
if (i == ARRAY_SIZE(lv0104cs_calibscales) - 1)
return -EINVAL;
mutex_lock(&lv0104cs->lock);
/* set calibscale (sensitivity) */
ret = lv0104cs_write_reg(lv0104cs->client,
lv0104cs_calibscales[index].regval);
if (ret)
goto err_mutex;
lv0104cs->calibscale = index;
err_mutex:
mutex_unlock(&lv0104cs->lock);
return ret;
}
static int lv0104cs_set_scale(struct lv0104cs_private *lv0104cs,
int val, int val2)
{
int i;
/* hard matching */
for (i = 0; i < ARRAY_SIZE(lv0104cs_scales); i++) {
if (val != lv0104cs_scales[i].val)
continue;
if (val2 == lv0104cs_scales[i].val2)
break;
}
if (i == ARRAY_SIZE(lv0104cs_scales))
return -EINVAL;
mutex_lock(&lv0104cs->lock);
lv0104cs->scale = i;
mutex_unlock(&lv0104cs->lock);
return 0;
}
static int lv0104cs_set_int_time(struct lv0104cs_private *lv0104cs,
int val, int val2)
{
int i;
/* hard matching */
for (i = 0; i < ARRAY_SIZE(lv0104cs_int_times); i++) {
if (val != lv0104cs_int_times[i].val)
continue;
if (val2 == lv0104cs_int_times[i].val2)
break;
}
if (i == ARRAY_SIZE(lv0104cs_int_times))
return -EINVAL;
mutex_lock(&lv0104cs->lock);
lv0104cs->int_time = i;
mutex_unlock(&lv0104cs->lock);
return 0;
}
static int lv0104cs_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct lv0104cs_private *lv0104cs = iio_priv(indio_dev);
if (chan->type != IIO_LIGHT)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_CALIBSCALE:
return lv0104cs_set_calibscale(lv0104cs, val, val2);
case IIO_CHAN_INFO_SCALE:
return lv0104cs_set_scale(lv0104cs, val, val2);
case IIO_CHAN_INFO_INT_TIME:
return lv0104cs_set_int_time(lv0104cs, val, val2);
default:
return -EINVAL;
}
}
static ssize_t lv0104cs_show_calibscale_avail(struct device *dev,
struct device_attribute *attr, char *buf)
{
ssize_t len = 0;
int i;
for (i = 0; i < ARRAY_SIZE(lv0104cs_calibscales); i++) {
len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
lv0104cs_calibscales[i].val,
lv0104cs_calibscales[i].val2);
}
buf[len - 1] = '\n';
return len;
}
static ssize_t lv0104cs_show_scale_avail(struct device *dev,
struct device_attribute *attr, char *buf)
{
ssize_t len = 0;
int i;
for (i = 0; i < ARRAY_SIZE(lv0104cs_scales); i++) {
len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
lv0104cs_scales[i].val,
lv0104cs_scales[i].val2);
}
buf[len - 1] = '\n';
return len;
}
static ssize_t lv0104cs_show_int_time_avail(struct device *dev,
struct device_attribute *attr, char *buf)
{
ssize_t len = 0;
int i;
for (i = 0; i < ARRAY_SIZE(lv0104cs_int_times); i++) {
len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
lv0104cs_int_times[i].val,
lv0104cs_int_times[i].val2);
}
buf[len - 1] = '\n';
return len;
}
static IIO_DEVICE_ATTR(calibscale_available, 0444,
lv0104cs_show_calibscale_avail, NULL, 0);
static IIO_DEVICE_ATTR(scale_available, 0444,
lv0104cs_show_scale_avail, NULL, 0);
static IIO_DEV_ATTR_INT_TIME_AVAIL(lv0104cs_show_int_time_avail);
static struct attribute *lv0104cs_attributes[] = {
&iio_dev_attr_calibscale_available.dev_attr.attr,
&iio_dev_attr_scale_available.dev_attr.attr,
&iio_dev_attr_integration_time_available.dev_attr.attr,
NULL
};
static const struct attribute_group lv0104cs_attribute_group = {
.attrs = lv0104cs_attributes,
};
static const struct iio_info lv0104cs_info = {
.attrs = &lv0104cs_attribute_group,
.read_raw = &lv0104cs_read_raw,
.write_raw = &lv0104cs_write_raw,
};
static const struct iio_chan_spec lv0104cs_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
BIT(IIO_CHAN_INFO_CALIBSCALE) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_INT_TIME),
},
};
static int lv0104cs_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct iio_dev *indio_dev;
struct lv0104cs_private *lv0104cs;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*lv0104cs));
if (!indio_dev)
return -ENOMEM;
lv0104cs = iio_priv(indio_dev);
i2c_set_clientdata(client, lv0104cs);
lv0104cs->client = client;
mutex_init(&lv0104cs->lock);
lv0104cs->calibscale = LV0104CS_CALIBSCALE_UNITY;
lv0104cs->scale = LV0104CS_SCALE_1X;
lv0104cs->int_time = LV0104CS_INTEG_200MS;
ret = lv0104cs_write_reg(lv0104cs->client,
lv0104cs_calibscales[LV0104CS_CALIBSCALE_UNITY].regval);
if (ret)
return ret;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = lv0104cs_channels;
indio_dev->num_channels = ARRAY_SIZE(lv0104cs_channels);
indio_dev->name = client->name;
indio_dev->info = &lv0104cs_info;
return devm_iio_device_register(&client->dev, indio_dev);
}
static const struct i2c_device_id lv0104cs_id[] = {
{ "lv0104cs", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lv0104cs_id);
static struct i2c_driver lv0104cs_i2c_driver = {
.driver = {
.name = "lv0104cs",
},
.id_table = lv0104cs_id,
.probe = lv0104cs_probe,
};
module_i2c_driver(lv0104cs_i2c_driver);
MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
MODULE_DESCRIPTION("LV0104CS Ambient Light Sensor Driver");
MODULE_LICENSE("GPL");
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