Date:	Tue, 18 Aug 2015 18:28:20 +0300
From:	Adriana Reus <adriana.reus@...el.com>
To:	Jonathan Cameron <jic23@...nel.org>, pmeerw@...erw.net,
	daniel.baluta@...el.com
CC:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/2] iio: light: Add support for UPISEMI uS5182d als
 and proximity sensor

Thanks for the review, added some comments inline, next patch set coming 
soon.

Adriana

On 15.08.2015 17:27, Jonathan Cameron wrote:
> On 14/08/15 10:29, Adriana Reus wrote:
>> Add support for UPISEMI us5182d als and proximity sensor.
>> Supports raw readings.
>> Data sheet for this device can be found here:
>> http://www.upi-semi.com/temp/uS5182D-DS-P0103-temp.pdf
>>
>> Signed-off-by: Adriana Reus <adriana.reus@...el.com>
> Mostly looking pretty good.  I've partly been (slightly) pickier than normal
> here because we are stalled for a few weeks anyway by the fact the merge
> window for IIO is now probably done (about a week before Linus opens his)
> and also we have device tree docs that will need comments or to sit for
> quite a while on the mailing list.
>
> Thanks,
>
> Jonathan
>> ---
>> Changes since v2:
>>   - Adressed Peter's comments (with the exception of setting
>>     the ths_vals array as const - if I do that the compiler will
>>     eventually whine because it gets passed as an argument to device_property_read).
> That should be a giveaway that you want to have a copy rather than one
> instance of this.  Stick a copy in your data structure with defaults
> if no others are supplied.
>
> Note we might have two different instances of this part on one device
> with different thresholds...
>
>
>>   - Tried to break down the compound register values into more intuitive definitions.
> Much improved .
>>   - Eliminated the read helper functions.
>>
>>   drivers/iio/light/Kconfig   |  10 +
>>   drivers/iio/light/Makefile  |   1 +
>>   drivers/iio/light/us5182d.c | 484 ++++++++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 495 insertions(+)
>>   create mode 100644 drivers/iio/light/us5182d.c
>>
>> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
>> index 7ed859a..0442f01 100644
>> --- a/drivers/iio/light/Kconfig
>> +++ b/drivers/iio/light/Kconfig
>> @@ -287,6 +287,16 @@ config TSL4531
>>   	 To compile this driver as a module, choose M here: the
>>   	 module will be called tsl4531.
>>
>> +config US5182D
>> +	tristate "UPISEMI light and proximity sensor"
>> +	depends on I2C
>> +	help
>> +	 If you say yes here you get support for the UPISEMI US5182D
>> +	 ambient light and proximity sensor.
>> +
>> +	 This driver can also be built as a module.  If so, the module
>> +	 will be called us5182d.
>> +
>>   config VCNL4000
>>   	tristate "VCNL4000 combined ALS and proximity sensor"
>>   	depends on I2C
>> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
>> index 91c74c0..528cc8f 100644
>> --- a/drivers/iio/light/Makefile
>> +++ b/drivers/iio/light/Makefile
>> @@ -27,4 +27,5 @@ obj-$(CONFIG_STK3310)          += stk3310.o
>>   obj-$(CONFIG_TCS3414)		+= tcs3414.o
>>   obj-$(CONFIG_TCS3472)		+= tcs3472.o
>>   obj-$(CONFIG_TSL4531)		+= tsl4531.o
>> +obj-$(CONFIG_US5182D)		+= us5182d.o
>>   obj-$(CONFIG_VCNL4000)		+= vcnl4000.o
>> diff --git a/drivers/iio/light/us5182d.c b/drivers/iio/light/us5182d.c
>> new file mode 100644
>> index 0000000..9ba99f5
>> --- /dev/null
>> +++ b/drivers/iio/light/us5182d.c
>> @@ -0,0 +1,484 @@
>> +/*
>> + * Copyright (c) 2015 Intel Corporation
>> + *
>> + * Driver for UPISEMI us5182d Proximity and Ambient Light Sensor.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License version 2 as published by
>> + * the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope it will be useful, but WITHOUT
>> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
>> + * more details.
>> + *
>> + * To do: Interrupt support.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/acpi.h>
>> +#include <linux/delay.h>
>> +#include <linux/i2c.h>
>> +#include <linux/iio/iio.h>
>> +#include <linux/iio/sysfs.h>
>> +#include <linux/mutex.h>
>> +
>> +#define US5182D_REG_CFG0				0x00
>> +#define US5182D_REG_CFG1				0x01
>> +#define US5182D_REG_CFG2				0x02
>> +#define US5182D_REG_CFG3				0x03
>> +#define US5182D_REG_CFG4				0x10
>> +
>> +/*
>> + * Registers for tuning the auto dark current cancelling feature.
>> + * DARK_TH(reg 0x27,0x28) - threshold (counts) for auto dark cancelling.
>> + * when ALS  > DARK_TH --> ALS_Code = ALS - Upper(0x2A) * Dark
>> + * when ALS < DARK_TH --> ALS_Code = ALS - Lower(0x29) * Dark
>> + */
>> +#define US5182D_REG_UDARK_TH			0x27
>> +#define US5182D_REG_DARK_AUTO_EN		0x2b
>> +#define US5182D_REG_AUTO_LDARK_GAIN		0x29
>> +#define US5182D_REG_AUTO_HDARK_GAIN		0x2a
>> +
> I'd be tempted to name these to make it clear which reg
> they are in.
> US5182D_CFG0_ONESHOT_EN etc.
> Hartmut did a nice tidy up of another driver the other day.
> He pulled the register address and elements down into one
> place and used a it of indenting to make it easy to read.
>
> For example.
>
> #define US5182D_REG_CFG0				0x00
> #define   US5182D_CFG0_ONESHOT_EN			BIT(6)
> #define   US5182D_SHUTDOWN_EN				BIT(7)
>
> etc.  Just a suggestion!  I don't really care as long as it
> is clear what the register map is!

>
>> +#define US5182D_ONESHOT_EN			BIT(6)
>> +#define US5182D_SHUTDOWN_EN			BIT(7)
>> +#define US5182D_OPMODE_ALS			0x01
>> +#define US5182D_OPMODE_PX			0x02
>> +#define US5182D_OPMODE_SHIFT			4
>> +#define US5182D_WORD_ENABLE			BIT(0)
>> +#define US5182D_ALS_RES16			BIT(4)
>> +#define US5182D_PX_RES16			BIT(4)
>> +#define US5182D_PXGAIN_DEFAULT			BIT(2)
>> +#define US5182D_LED_CURRENT100			(BIT(4) | BIT(5))
>> +
>> +#define US5182D_REG_CFG0_DEFAULT \
>> +	(US5182D_SHUTDOWN_EN | US5182D_WORD_ENABLE)
> I'm missing something here, but SHUTDOWN_EN is never disabled?
> I'd have assumed that meant the device was always off!

In oneshot mode the chip gets powered off automatically after taking the
required measurement. I'll add a comment.
>
> Guessing some magic is going on that might want a comment here.
> (just read datasheet section on this so I now understand what you
>   how this works, but please add a brief explanation, perhaps
>   where you set the oneshot enable).
>
> Also more I'd not bother having these defined like this
> up here.  Doesn't add anything over using them directly
> in the array below.
>
>> +#define US5182D_REG_CFG1_DEFAULT		US5182D_ALS_RES16
>> +#define US5182D_REG_CFG2_DEFAULT \
>> +	(US5182D_PX_RES16 | US5182D_PXGAIN_DEFAULT)
>> +#define US5182D_REG_CFG3_DEFAULT		US5182D_LED_CURRENT100
>> +#define US5182D_REG_CFG4_DEFAULT		0x00
>> +
>> +#define US5182D_REG_DARK_AUTO_EN_DEFAULT	0x80
>> +#define US5182D_REG_AUTO_LDARK_GAIN_DEFAULT	0x16
>> +#define US5182D_REG_AUTO_HDARK_GAIN_DEFAULT	0x00
>> +
>> +#define US5182D_REG_ADL				0x0c
>> +#define US5182D_REG_PDL				0x0e
>> +
>> +#define US5182D_REG_MODE_STORE			0x21
>> +#define US5182D_STORE_MODE			0x01
>> +
>> +#define US5182D_REG_CHIPID			0xb2
>> +
>> +#define US5182D_OPMODE_MASK			GENMASK(5, 4)
>> +#define US5182D_AGAIN_MASK			0x07
>> +#define US5182D_RESET_CHIP			0x01
>> +
>> +#define US5182D_CHIPID				0x26
>> +#define US5182D_DRV_NAME			"us5182d"
>> +
>> +#define US5182D_GA_RESOLUTION			1000
>> +
>> +#define US5182D_READ_BYTE			1
>> +#define US5182D_READ_WORD			2
>> +#define US5182D_OPSTORE_SLEEP_TIME		20 /* ms */
>> +
>> +/* available ranges: [12354, 7065, 3998, 2202, 1285, 498, 256, 138] lux */
>> +static const int us5182d_scales[] = {188500, 107800, 61000, 33600, 19600, 7600,
>> +				     3900, 2100};
>> +
>> +/*
>> + * experimental th's that work with US5182D sensor on evaluation board
>> + * roughly between 12-32 lux
> Experimental (or I'll get a trivial batch within a day or so 'fixing' it ;)
> Also long hand 'th' in the comment (thresholds persumably?).
ok
>> + */
>> +static u16 us5182d_dark_ths_vals[] = {170, 200, 512, 512, 800, 2000, 4000,
>> +				      8000};
>> +
>> +enum mode {
>> +	US5182D_ALS_PX,
>> +	US5182D_ALS_ONLY,
>> +	US5182D_PX_ONLY
>> +};
>> +
>> +struct us5182d_data {
>> +	struct i2c_client *client;
>> +	/* protect opmode */
> Why not name it to indicate such?
>> +	struct mutex lock;
>> +
>> +	/* Glass attenuation factor */
>> +	u32 ga;
>> +
>> +	/* Dark gain tuning */
>> +	u8 lower_dark_gain;
>> +	u8 upper_dark_gain;
>> +	u16 *us5182d_dark_ths;
>> +
>> +	u8 opmode;
>> +};
>> +
>> +static IIO_CONST_ATTR(in_illuminance_scale_available,
>> +		      "0.0021 0.0039 0.0076 0.0196 0.0336 0.061 0.1078 0.1885");
>> +
>> +static struct attribute *us5182d_attrs[] = {
>> +	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
>> +	NULL
>> +};
>> +
>> +static const struct attribute_group us5182d_attr_group = {
>> +	.attrs = us5182d_attrs,
>> +};
>> +
>> +static const struct {
>> +	u8 reg;
>> +	u8 val;
>> +} us5182d_regvals[] = {
>> +	{US5182D_REG_CFG0, US5182D_REG_CFG0_DEFAULT},
>> +	{US5182D_REG_CFG1, US5182D_REG_CFG1_DEFAULT},
>> +	{US5182D_REG_CFG2, US5182D_REG_CFG2_DEFAULT},
>> +	{US5182D_REG_CFG3, US5182D_REG_CFG3_DEFAULT},
>> +	{US5182D_REG_MODE_STORE, US5182D_STORE_MODE},
>> +	{US5182D_REG_CFG4, US5182D_REG_CFG4_DEFAULT},
>> +};
>> +
>> +static const struct iio_chan_spec us5182d_channels[] = {
>> +	{
>> +		.type = IIO_LIGHT,
>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
>> +				      BIT(IIO_CHAN_INFO_SCALE),
>> +	},
>> +	{
>> +		.type = IIO_PROXIMITY,
>> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
>> +	}
>> +};
>> +
>> +static int us5182d_get_als(struct us5182d_data *data)
>> +{
>> +	int ret;
>> +	unsigned long result;
>> +
>> +	ret = i2c_smbus_read_word_data(data->client,
>> +				       US5182D_REG_ADL);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	result = ret * data->ga / US5182D_GA_RESOLUTION;
>> +	if (result > 0xffff)
>> +		result = 0xffff;
>> +
>> +	return result;
>> +}
>> +
>> +static int us5182d_set_opmode(struct us5182d_data *data, u8 mode)
>> +{
>> +	int ret;
>> +
>> +	ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = ret | US5182D_ONESHOT_EN;
>> +
>> +	/* update mode */
>> +	ret = ret & ~US5182D_OPMODE_MASK;
>> +	ret = ret | (mode << US5182D_OPMODE_SHIFT);
>> +
>> +	ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	if (mode == data->opmode)
>> +		return 0;
>> +
>> +	data->opmode = mode;
>> +	ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_MODE_STORE,
>> +					US5182D_STORE_MODE);
> This is a lock / commit register? If so what is happening here is a little
> bit quirky and a brief comment to explain would be good.
I'm sorry, I am not familiar with that terminology, so i'm not sure if 
that qualifies, the data sheet simply instructs that after a new opmode 
is set - we should additionally write 1 in the mode storage register. 
I'll add a comment nonetheless.
>
>> +	if (ret < 0)
>> +		return ret;
> blank line here would make it a touch more readable (don't be afraid
> to add white space in moderation!)
>> +	msleep(US5182D_OPSTORE_SLEEP_TIME);
>> +
>> +	return 0;
>> +}
>> +
>> +static int us5182d_read_raw(struct iio_dev *indio_dev,
>> +			    struct iio_chan_spec const *chan, int *val,
>> +			    int *val2, long mask)
>> +{
>> +	struct us5182d_data *data = iio_priv(indio_dev);
>> +	int ret;
>> +
>> +	switch (mask) {
>> +	case IIO_CHAN_INFO_RAW:
>> +		switch (chan->type) {
>> +		case IIO_LIGHT:
>> +			mutex_lock(&data->lock);
>> +			ret = us5182d_set_opmode(data, US5182D_OPMODE_ALS);
>> +			if (ret < 0)
>> +				goto out_err;
>> +
>> +			ret = us5182d_get_als(data);
>> +			if (ret < 0)
>> +				goto out_err;
>> +			mutex_unlock(&data->lock);
>> +			*val = ret;
>> +			return IIO_VAL_INT;
>> +		case IIO_PROXIMITY:
>> +			mutex_lock(&data->lock);
>> +			ret = us5182d_set_opmode(data, US5182D_OPMODE_PX);
>> +			if (ret < 0)
>> +				goto out_err;
>> +
>> +			ret = i2c_smbus_read_word_data(data->client,
>> +						       US5182D_REG_PDL);
>> +			if (ret < 0)
>> +				goto out_err;
>> +			mutex_unlock(&data->lock);
>> +			*val = ret;
>> +			return  IIO_VAL_INT;
>> +		default:
>> +			return -EINVAL;
>> +		}
>> +
>> +	case IIO_CHAN_INFO_SCALE:
>> +		ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1);
>> +		if (ret < 0)
>> +			return ret;
> I'd add a blank line here to aid readability (nitpick)
>> +		*val = 0;
>> +		ret = (ret & US5182D_AGAIN_MASK);
>> +		*val2 = us5182d_scales[ret];
> Maybe roll the two lines above into one?
> Blank line here also nice for readability and in equivalent places.
>> +		return IIO_VAL_INT_PLUS_MICRO;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	return -EINVAL;
>> +out_err:
>> +	mutex_unlock(&data->lock);
>> +	return ret;
>> +}
>> +
>> +static int us5182d_update_dark_th(struct us5182d_data *data, int index)
>> +{
>> +	__be16 dark_th = cpu_to_be16(data->us5182d_dark_ths[index]);
>> +	u8 *bytes = (u8 *)&dark_th;
> Cast it at use site rather than here.
>
>> +	int ret;
>> +
>> +	/* Registers Dark_Th (0x27 0x28) don't work in word mode accessing */
>> +	ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH,
>> +					bytes[0]);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH + 1,
>> +					bytes[1]);
>> +}
>> +
>> +static int us5182d_apply_scale(struct us5182d_data *data, int index)
>> +{
>> +	int ret;
>> +
>> +	ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = ret & (~US5182D_AGAIN_MASK);
>> +	ret |= index;
>> +
>> +	ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG1, ret);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return us5182d_update_dark_th(data, index);
>> +}
>> +
>> +static int us5182d_write_raw(struct iio_dev *indio_dev,
>> +			     struct iio_chan_spec const *chan, int val,
>> +			     int val2, long mask)
>> +{
>> +	struct us5182d_data *data = iio_priv(indio_dev);
>> +	int ret, i;
>> +
>> +	switch (mask) {
>> +	case IIO_CHAN_INFO_SCALE:
>> +		if (val != 0)
>> +			return -EINVAL;
>> +		for (i = 0; i < ARRAY_SIZE(us5182d_scales); i++)
>> +			if (val2 == us5182d_scales[i]) {
>> +				mutex_lock(&data->lock);
>> +				ret = us5182d_apply_scale(data, i);
>
> I'd be tempted to move the lock into apply_scale... Otherwise, you
> should add kernel-doc to that function to specify the lock should be held.
> (I think given the calls out to update_dark_th in there, I'd be tempted
> to just document the need for both those funcs to be called with the
> lock held).
>> +				mutex_unlock(&data->lock);
>> +				return ret;
>> +			}
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	return -EINVAL;
>> +}
>> +
>> +static const struct iio_info us5182d_info = {
>> +	.driver_module	= THIS_MODULE,
>> +	.read_raw = us5182d_read_raw,
>> +	.write_raw = us5182d_write_raw,
>> +	.attrs = &us5182d_attr_group,
>> +};
>> +
>> +static int us5182d_reset(struct iio_dev *indio_dev)
>> +{
>> +	struct us5182d_data *data = iio_priv(indio_dev);
>> +
>> +	return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG3,
>> +					 US5182D_RESET_CHIP);
>> +}
>> +
>> +static int us5182d_init(struct iio_dev *indio_dev)
>> +{
>> +	struct us5182d_data *data = iio_priv(indio_dev);
>> +	int i, ret;
>> +
>> +	ret = us5182d_reset(indio_dev);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	data->opmode = 0;
>> +	for (i = 0; i < ARRAY_SIZE(us5182d_regvals); i++) {
>> +		ret = i2c_smbus_write_byte_data(data->client,
>> +						us5182d_regvals[i].reg,
>> +						us5182d_regvals[i].val);
>> +		if (ret < 0)
>> +			return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static void us5182d_get_platform_data(struct iio_dev *indio_dev)
>> +{
>> +	struct us5182d_data *data = iio_priv(indio_dev);
>> +
>> +	if (device_property_read_u32(&data->client->dev, "upisemi,glass-coef",
>> +				     &data->ga))
>> +		data->ga = US5182D_GA_RESOLUTION;
>> +	if (device_property_read_u16_array(&data->client->dev,
>> +					   "upisemi,dark-ths",
>> +					   data->us5182d_dark_ths,
>> +					   ARRAY_SIZE(us5182d_dark_ths_vals)))
>> +		data->us5182d_dark_ths = us5182d_dark_ths_vals;
>> +	if (device_property_read_u8(&data->client->dev,
>> +				    "upisemi,upper-dark-gain",
>> +				    &data->upper_dark_gain))
>> +		data->upper_dark_gain = US5182D_REG_AUTO_HDARK_GAIN_DEFAULT;
>> +	if (device_property_read_u8(&data->client->dev,
>> +				    "upisemi,lower-dark-gain",
>> +				    &data->lower_dark_gain))
>> +		data->lower_dark_gain = US5182D_REG_AUTO_LDARK_GAIN_DEFAULT;
>> +}
>> +
>> +static int  us5182d_dark_gain_config(struct iio_dev *indio_dev)
>> +{
>> +	struct us5182d_data *data = iio_priv(indio_dev);
>> +	u8 index = US5182D_REG_CFG1_DEFAULT & US5182D_AGAIN_MASK;
>> +	int ret;
>> +
>> +	ret = us5182d_update_dark_th(data, index);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = i2c_smbus_write_byte_data(data->client,
>> +					US5182D_REG_AUTO_LDARK_GAIN,
>> +					data->lower_dark_gain);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = i2c_smbus_write_byte_data(data->client,
>> +					US5182D_REG_AUTO_HDARK_GAIN,
>> +					data->upper_dark_gain);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return i2c_smbus_write_byte_data(data->client, US5182D_REG_DARK_AUTO_EN,
>> +					 US5182D_REG_DARK_AUTO_EN_DEFAULT);
>> +}
>> +
>> +static int us5182d_probe(struct i2c_client *client,
>> +			 const struct i2c_device_id *id)
>> +{
>> +	struct us5182d_data *data;
>> +	struct iio_dev *indio_dev;
>> +	int ret;
>> +
>> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
>> +	if (!indio_dev)
>> +		return -ENOMEM;
>> +
>> +	data = iio_priv(indio_dev);
>> +	i2c_set_clientdata(client, indio_dev);
>> +	data->client = client;
>> +
>> +	mutex_init(&data->lock);
>> +
>> +	indio_dev->dev.parent = &client->dev;
>> +	indio_dev->info = &us5182d_info;
>> +	indio_dev->name = US5182D_DRV_NAME;
>> +	indio_dev->channels = us5182d_channels;
>> +	indio_dev->num_channels = ARRAY_SIZE(us5182d_channels);
>> +	indio_dev->modes = INDIO_DIRECT_MODE;
>> +
>> +	ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CHIPID);
>> +	if (ret != US5182D_CHIPID) {
>> +		dev_err(&data->client->dev,
>> +			"Failed to detect US5182 light chip\n");
>> +		return (ret < 0) ? ret : -ENODEV;
>> +	}
>> +
>> +	us5182d_get_platform_data(indio_dev);
>> +	ret = us5182d_init(indio_dev);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = us5182d_dark_gain_config(indio_dev);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return iio_device_register(indio_dev);
>> +}
>> +
>> +static int us5182d_remove(struct i2c_client *client)
>> +{
>> +	iio_device_unregister(i2c_get_clientdata(client));
>> +	return i2c_smbus_write_byte_data(client, US5182D_REG_CFG0,
>> +					 US5182D_REG_CFG0_DEFAULT);
> Nitpick :)
> I'd be tempted here (as we are shutting down and it doesn't matter anyway)
> to use just the SHUTDOWN_EN value as then it's immediately obvious
> what you are doing here.
would look nicer
>
>> +}
>> +
>> +static const struct acpi_device_id us5182d_acpi_match[] = {
>> +	{ "USD5182", 0},
>> +	{}
>> +};
>> +
>> +MODULE_DEVICE_TABLE(acpi, us5182d_acpi_match);
>> +
>> +static const struct i2c_device_id us5182d_id[] = {
>> +		{"usd5182", 0},
>> +		{}
>> +};
>> +
>> +MODULE_DEVICE_TABLE(i2c, us5182d_id);
>> +
>> +static struct i2c_driver us5182d_driver = {
>> +	.driver = {
>> +		.name = US5182D_DRV_NAME,
>> +		.acpi_match_table = ACPI_PTR(us5182d_acpi_match),
>> +	},
>> +	.probe = us5182d_probe,
>> +	.remove = us5182d_remove,
>> +	.id_table = us5182d_id,
>> +
>> +};
>> +module_i2c_driver(us5182d_driver);
>> +
>> +MODULE_AUTHOR("Adriana Reus <adriana.reus@...el.com>");
>> +MODULE_DESCRIPTION("Driver for us5182d Proximity and Light Sensor");
>> +MODULE_LICENSE("GPL v2");
>>
>
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