Date:	Thu, 4 Jul 2013 10:17:20 +0200 (CEST)
From:	Peter Meerwald <pmeerw@...erw.net>
To:	Kevin Tsai <ktsai@...ellamicro.com>
cc:	Jonathan Cameron <jic23@....ac.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	devel@...verdev.osuosl.org, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 1/1] Added Capella CM3218 Ambient Light Sensor IIO
 Driver.

Hello,

some comments inline;
new drivers should not go to staging but to mainline directly 

regards, p.

> Signed-off-by: Kevin Tsai <ktsai@...ellamicro.com>
> ---
>  drivers/staging/iio/light/Kconfig  |   10 +
>  drivers/staging/iio/light/Makefile |    1 +
>  drivers/staging/iio/light/cm3218.c |  581 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 592 insertions(+)
>  create mode 100644 drivers/staging/iio/light/cm3218.c
> 
> diff --git a/drivers/staging/iio/light/Kconfig b/drivers/staging/iio/light/Kconfig
> index ca8d6e6..647af0c 100644
> --- a/drivers/staging/iio/light/Kconfig
> +++ b/drivers/staging/iio/light/Kconfig
> @@ -40,4 +40,14 @@ config TSL2x7x
>  	 tmd2672, tsl2772, tmd2772 devices.
>  	 Provides iio_events and direct access via sysfs.
>  
> +config SENSORS_CM3218
> +        tristate "CM3218 Ambient Light Sensor"
> +        depends on I2C
> +        help
> +         Say Y here if you have a Capella Micro CM3218 Ambient Light Sensor.
> +
> +         To compile this driver as a module, choose M here.  This module
> +         will be called to 'cm3218'.  It will access ALS data via iio sysfs.
> +         This is recommended.
> +
>  endmenu
> diff --git a/drivers/staging/iio/light/Makefile b/drivers/staging/iio/light/Makefile
> index 9960fdf..63020ab 100644
> --- a/drivers/staging/iio/light/Makefile
> +++ b/drivers/staging/iio/light/Makefile
> @@ -6,3 +6,4 @@ obj-$(CONFIG_SENSORS_ISL29018)	+= isl29018.o
>  obj-$(CONFIG_SENSORS_ISL29028)	+= isl29028.o
>  obj-$(CONFIG_TSL2583)	+= tsl2583.o
>  obj-$(CONFIG_TSL2x7x)	+= tsl2x7x_core.o
> +obj-$(CONFIG_SENSORS_CM3218)    += cm3218.o
> diff --git a/drivers/staging/iio/light/cm3218.c b/drivers/staging/iio/light/cm3218.c
> new file mode 100644
> index 0000000..9c2584d
> --- /dev/null
> +++ b/drivers/staging/iio/light/cm3218.c
> @@ -0,0 +1,581 @@
> +/*
> + * A iio driver for CM3218 Ambient Light Sensor.
> + *
> + * IIO driver for monitoring ambient light intensity in lux.
> + *
> + * Copyright (c) 2013, Capella Microsystems Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that 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.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA	02110-1301, USA.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/err.h>
> +#include <linux/mutex.h>
> +#include <linux/delay.h>
> +#include <linux/slab.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +
> +/*
> + * SMBus ARA address
maybe Address for consistency? 

> + */
> +#define	CM3218_ADDR_ARA			0x0C
> +
> +/*
> + * CM3218 CMD Registers
> + */
> +#define	CM3218_REG_ADDR_CMD		0x00
> +#define	CM3218_CMD_ALS_SD		0x0001
> +#define	CM3218_CMD_ALS_INT_EN		0x0002
> +#define	CM3218_CMD_ALS_IT_SHIFT		6
> +#define	CM3218_CMD_ALS_IT_MASK		(3 << CM3218_CMD_ALS_IT_SHIFT)
> +#define	CM3218_CMD_ALS_IT_05T		(0 << CM3218_CMD_ALS_IT_SHIFT)
> +#define	CM3218_CMD_ALS_IT_1T		(1 << CM3218_CMD_ALS_IT_SHIFT)
> +#define	CM3218_CMD_ALS_IT_2T		(2 << CM3218_CMD_ALS_IT_SHIFT)
> +#define	CM3218_CMD_ALS_IT_4T		(3 << CM3218_CMD_ALS_IT_SHIFT)

> +#define	CM3218_DEFAULT_CMD		(CM3218_CMD_ALS_IT_1T)
no parenthesis needed 

> +
> +#define	CM3218_REG_ADDR_ALS_WH		0x01
> +#define	CM3218_DEFAULT_ALS_WH		0xFFFF
> +
> +#define	CM3218_REG_ADDR_ALS_WL		0x02
> +#define	CM3218_DEFAULT_ALS_WL		0x0000
> +
> +#define	CM3218_REG_ADDR_ALS		0x04
> +
> +#define	CM3218_REG_ADDR_STATUS		0x06
> +
> +#define	CM3218_REG_ADDR_ID		0x07
> +
> +/*
> + * Software Parameters
> + */
> +#define	CM3218_MAX_CACHE_REGS		(0x03+1)	/* Reg.0x00 to 0x03 */
> +
> +/*
> + * Features
> + */
> +#define	CM3218_DEBUG
> +
> +static const unsigned short normal_i2c[] = {
> +	0x10, 0x48, I2C_CLIENT_END };
> +
> +struct cm3218_chip {
> +	struct i2c_client	*client;
> +	struct mutex		lock;
> +	unsigned int		lensfactor;
> +	bool			suspended;
> +	u16			reg_cache[CM3218_MAX_CACHE_REGS];
> +};
> +
> +static int cm3218_read_ara(struct i2c_client *client)
> +{
> +	int status;
> +	unsigned short addr;
> +
> +	addr = client->addr;
> +	client->addr = CM3218_ADDR_ARA;
> +	status = i2c_smbus_read_byte(client);
> +	client->addr = addr;
> +
> +	if (status < 0)
> +		return -ENODEV;
> +
> +	return 0;
> +}
> +
> +static int cm3218_write(struct i2c_client *client, u8 reg, u16 value)
> +{
> +	u16 regval;
> +	int ret;
> +	struct cm3218_chip *chip = iio_priv(i2c_get_clientdata(client));
> +
> +#ifdef	CM3218_DEBUG
> +	dev_err(&client->dev,
> +		"Write to device register 0x%02X with 0x%04X\n", reg, value);
> +#endif	/* CM3218_DEBUG */

dev_dbg? and no _DEBUG

> +	regval = cpu_to_le16(value);
> +	ret = i2c_smbus_write_word_data(client, reg, regval);
> +	if (ret) {
> +		dev_err(&client->dev, "Write to device fails: 0x%x\n", ret);
> +	} else {
> +		/* Update cache */
> +		if (reg < CM3218_MAX_CACHE_REGS)
> +			chip->reg_cache[reg] = value;
> +	}
> +
> +	return ret;
> +}

there is regmap for caching register contents; maybe overkill..

> +
> +static int cm3218_read(struct i2c_client *client, u8 reg)
> +{
> +	int regval;
> +	int status;
> +	struct cm3218_chip *chip = iio_priv(i2c_get_clientdata(client));
> +
> +	if (reg < CM3218_MAX_CACHE_REGS) {
> +		regval = chip->reg_cache[reg];
> +	} else {
> +		status = i2c_smbus_read_word_data(client, reg);
> +		if (status < 0) {
> +			dev_err(&client->dev,
> +				"Error in reading Reg.0x%02X\n", reg);
> +			return status;
> +		}
> +		regval = le16_to_cpu(status);
> +#ifdef	CM3218_DEBUG
> +		dev_err(&client->dev,
> +			"Read from device register 0x%02X = 0x%04X\n",
> +			reg, regval);
> +#endif	/* CM3218_DEBUG */
> +	}
> +
> +	return regval;
> +}
> +
> +static int cm3218_read_sensor_input(struct i2c_client *client)
> +{
> +	int status;
> +	int lux;
> +
> +	status = cm3218_read(client, CM3218_REG_ADDR_ALS);
> +	if (status < 0) {
> +		dev_err(&client->dev, "Error in reading Lux DATA\n");
> +		return status;
> +	}
> +	lux = status;
> +
> +	dev_vdbg(&client->dev, "lux = %u\n", lux);
> +
> +	return lux;
> +}
> +
> +static int cm3218_read_lux(struct i2c_client *client, int *lux)
> +{
> +	struct cm3218_chip *chip = iio_priv(i2c_get_clientdata(client));
> +	int lux_data;
> +
> +	lux_data = cm3218_read_sensor_input(client);
> +
> +	if (lux_data < 0)
> +		return lux_data;
> +
> +	*lux  = lux_data * chip->lensfactor;
> +	*lux /= 1000;
> +	return 0;
> +}

these read wrappers could probably be avoided; most of the code is 
cascaded error handling

> +
> +/* Sysfs interface */
> +/* lensfactor */

comment style

> +static ssize_t show_lensfactor(struct device *dev,
> +			struct device_attribute *attr, char *buf)
> +{
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +	struct cm3218_chip *chip = iio_priv(indio_dev);
> +
> +	return sprintf(buf, "%d\n", chip->lensfactor);
> +}

the sysfs interface seems to be redundant; there is also CALIBSCALE

> +
> +static ssize_t store_lensfactor(struct device *dev,
> +		struct device_attribute *attr, const char *buf, size_t count)
> +{
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +	struct cm3218_chip *chip = iio_priv(indio_dev);
> +	unsigned long lval;
> +
> +/*
> +	lval = kstrtoul(buf, NULL, 10);
> +	if (lval == 0)
> +		return -EINVAL;
> +*/

remove comment before submission

> +	if (kstrtoul(buf, 10, &lval))
> +		return -EINVAL;
> +
> +	mutex_lock(&chip->lock);
> +	chip->lensfactor = lval;
> +	mutex_unlock(&chip->lock);
> +
> +	return count;
> +}
> +
> +static ssize_t get_sensor_data(struct device *dev, char *buf)
> +{
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +	struct cm3218_chip *chip = iio_priv(indio_dev);
> +	struct i2c_client *client = chip->client;
> +	int value = 0;
> +	int status;
> +
> +	mutex_lock(&chip->lock);
> +	if (chip->suspended) {
> +		mutex_unlock(&chip->lock);
> +		return -EBUSY;
> +	}
> +
> +	 status = cm3218_read_lux(client, &value);

extra space here

> +
> +	if (status < 0) {
> +		dev_err(&client->dev, "Error in Reading data");
> +		mutex_unlock(&chip->lock);
> +		return status;
> +	}
> +
> +	mutex_unlock(&chip->lock);
> +
> +	return sprintf(buf, "%d\n", value);
> +}
> +
> +
> +/* Read lux */
> +static ssize_t show_lux(struct device *dev,
> +	struct device_attribute *devattr, char *buf)
> +{
> +	return get_sensor_data(dev, buf);
> +}
> +
> +#ifdef	CM3218_DEBUG
> +/* windows_high */

there would be debugfs_reg_access in iio_info

> +static ssize_t show_cmd(struct device *dev,
> +	struct device_attribute *attr, char *buf)
> +{
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +	struct cm3218_chip *chip = iio_priv(indio_dev);
> +	struct i2c_client *client = chip->client;
> +	int status;
> +
> +	status = cm3218_read(client, CM3218_REG_ADDR_CMD);
> +	if (status < 0) {
> +		dev_err(dev, "Error in getting CM3218_REG_ADDR_CMD\n");
> +		return status;
> +	}
> +
> +	return sprintf(buf, "%u\n", status);
> +}
> +
> +static ssize_t store_cmd(struct device *dev,
> +		struct device_attribute *attr, const char *buf, size_t count)
> +{
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +	struct cm3218_chip *chip = iio_priv(indio_dev);
> +	struct i2c_client *client = chip->client;
> +	int status;
> +	unsigned long lval;
> +
> +	if (kstrtoul(buf, 10, &lval))
> +		return -EINVAL;
> +
> +	mutex_lock(&chip->lock);
> +	if (lval > 0x10000)
> +		lval = 0xFFFF;
> +	status = cm3218_write(client, CM3218_REG_ADDR_CMD, (u16)lval);
> +	if (status < 0) {
> +		mutex_unlock(&chip->lock);
> +		dev_err(dev, "Error in setting CM3218_REG_ADDR_CMD\n");
> +		return status;
> +	}
> +	mutex_unlock(&chip->lock);
> +
> +	return count;
> +}
> +
> +/* status */
> +static ssize_t show_status(struct device *dev,
> +			struct device_attribute *attr, char *buf)
> +{
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +	struct cm3218_chip *chip = iio_priv(indio_dev);
> +	struct i2c_client *client = chip->client;
> +	int status;
> +
> +	status = cm3218_read(client, CM3218_REG_ADDR_STATUS);
> +	if (status < 0) {
> +		dev_err(dev, "Error in getting CM3218_REG_ADDR_STATUS\n");
> +		return status;
> +	}
> +
> +	return sprintf(buf, "%u\n", status);
> +}
> +
> +#endif	/* CM3218_DEBUG */
> +
> +/* Channel IO */
> +static int cm3218_write_raw(struct iio_dev *indio_dev,
> +			      struct iio_chan_spec const *chan,
> +			      int val,
> +			      int val2,
> +			      long mask)
> +{
> +	struct cm3218_chip *chip = iio_priv(indio_dev);
> +	int ret = -EINVAL;

ret is not used?

> +
> +	mutex_lock(&chip->lock);
> +	if (mask == IIO_CHAN_INFO_CALIBSCALE && chan->type == IIO_LIGHT) {
> +		chip->lensfactor = val;
> +		ret = 0;
> +	}
> +	mutex_unlock(&chip->lock);
> +
> +	return 0;
> +}
> +
> +static int cm3218_read_raw(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan,
> +			     int *val,
> +			     int *val2,
> +			     long mask)
> +{
> +	int ret = -EINVAL;
> +	struct cm3218_chip *chip = iio_priv(indio_dev);
> +	struct i2c_client *client = chip->client;
> +
> +	mutex_lock(&chip->lock);
> +	if (chip->suspended) {
> +		mutex_unlock(&chip->lock);
> +		return -EBUSY;
> +	}
> +	switch (mask) {
> +	case 0:

huh? this is not in the channels?

> +		ret = cm3218_read_lux(client, val);
> +		if (!ret)
> +			ret = IIO_VAL_INT;
> +		break;
> +	case IIO_CHAN_INFO_CALIBSCALE:
> +		*val = chip->lensfactor;
> +		ret = IIO_VAL_INT_PLUS_MICRO;
> +		break;
> +	default:
> +		break;
> +	}
> +	mutex_unlock(&chip->lock);
> +	return ret;
> +}
> +
> +#define IIO_CHAN_INFO_SEPARATE_BIT(type) BIT(type*2 + 1)
> +#define IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT                   \
> +	IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_CALIBSCALE)
> +
> +static const struct iio_chan_spec cm3218_channels[] = {
> +	{
> +		.type = IIO_LIGHT,
> +		.indexed = 1,
> +		.channel = 0,
> +		.info_mask = IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,

info_mask_separate was recently introduced

> +	}
> +};
> +
> +static IIO_DEVICE_ATTR(illuminance0_input, S_IRUGO, show_lux, NULL, 0);
> +static IIO_DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR,
> +					show_lensfactor, store_lensfactor, 0);

not needed; I think you just need the iio_chan_spec

> +#ifdef	CM3218_DEBUG
> +static IIO_DEVICE_ATTR(cmd, S_IRUGO | S_IWUSR, show_cmd, store_cmd, 0);
> +static IIO_DEVICE_ATTR(status, S_IRUGO, show_status, NULL, 0);
> +#endif	/* CM3218_DEBUG */
> +
> +#define CM3218_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
> +#define CM3218_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
> +static struct attribute *cm3218_attributes[] = {
> +	CM3218_DEV_ATTR(illuminance0_input),
> +	CM3218_DEV_ATTR(illuminance0_calibscale),
> +#ifdef	CM3218_DEBUG
> +	CM3218_DEV_ATTR(cmd),
> +	CM3218_DEV_ATTR(status),
> +#endif	/* CM3218_DEBUG */
> +	NULL
> +};
> +
> +static const struct attribute_group cm3218_group = {
> +	.attrs = cm3218_attributes,
> +};
> +
> +static int cm3218_chip_init(struct i2c_client *client)
> +{
> +	struct cm3218_chip *chip = iio_priv(i2c_get_clientdata(client));
> +	int status, i;
> +
> +	memset(chip->reg_cache, 0, sizeof(chip->reg_cache));
> +
> +	for (i = 0; i < 5; i++) {
> +		status = cm3218_write(client, CM3218_REG_ADDR_CMD,
> +				CM3218_CMD_ALS_SD);
> +		if (status >= 0)
> +			break;
> +		cm3218_read_ara(client);
> +	}
> +
> +	status = cm3218_write(client, CM3218_REG_ADDR_CMD, CM3218_DEFAULT_CMD);
> +	if (status < 0) {
> +		dev_err(&client->dev, "Init CM3218 CMD fails\n");
> +		return status;
> +	}
> +
> +
> +	/* Clean interrupt status */
> +	cm3218_read(client, CM3218_REG_ADDR_STATUS);
> +
> +	return 0;
> +}
> +
> +static const struct iio_info cm3218_info = {
> +	.attrs = &cm3218_group,
> +	.driver_module = THIS_MODULE,
> +	.read_raw = &cm3218_read_raw,
> +	.write_raw = &cm3218_write_raw,
> +};
> +
> +static int cm3218_probe(struct i2c_client *client,
> +			 const struct i2c_device_id *id)
> +{
> +	struct cm3218_chip *chip;
> +	struct iio_dev *indio_dev;
> +	int err;
> +
> +	indio_dev = iio_device_alloc(sizeof(*chip));
> +	if (indio_dev == NULL) {
> +		dev_err(&client->dev, "iio allocation fails\n");
> +		err = -ENOMEM;
> +		goto exit;

maybe directly return -ENOMEM?

> +	}
> +	chip = iio_priv(indio_dev);
> +	chip->client = client;
> +	i2c_set_clientdata(client, indio_dev);
> +
> +	mutex_init(&chip->lock);
> +
> +	chip->lensfactor = 1000;

maybe some platform data, DT magic to allow passing the lens factor?

> +	chip->suspended = false;
> +
> +	err = cm3218_chip_init(client);
> +	if (err)
> +		goto exit_iio_free;
> +
> +	indio_dev->info = &cm3218_info;
> +	indio_dev->channels = cm3218_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(cm3218_channels);
> +	indio_dev->name = id->name;
> +	indio_dev->dev.parent = &client->dev;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +	err = iio_device_register(indio_dev);
> +	if (err) {
> +		dev_err(&client->dev, "iio registration fails\n");
> +		goto exit_iio_free;
> +	}
> +
> +	return 0;
> +exit_iio_free:
> +	iio_device_free(indio_dev);
> +exit:
> +	return err;
> +}
> +
> +static int cm3218_detect(struct i2c_client *client,
> +				   struct i2c_board_info *info)
> +{
> +	struct i2c_adapter *adapter = client->adapter;
> +	const char *name = NULL;
> +
> +	cm3218_read_ara(client);
> +
> +	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
> +		return -ENODEV;

the driver needs WORD_DATA
the check is after read_ara (which only needs BYTE_DATA)
what is read_ara() fails

> +
> +	name = "cm3218";
> +	strlcpy(info->type, name, I2C_NAME_SIZE);
> +
> +	return 0;
> +}
> +
> +static int cm3218_remove(struct i2c_client *client)
> +{
> +	struct iio_dev *indio_dev = i2c_get_clientdata(client);
> +
> +	dev_dbg(&client->dev, "%s()\n", __func__);
> +	iio_device_unregister(indio_dev);
> +	iio_device_free(indio_dev);
> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int cm3218_suspend(struct device *dev)
> +{
> +	struct cm3218_chip *chip = iio_priv(dev_get_drvdata(dev));
> +
> +	mutex_lock(&chip->lock);
> +
> +	/* Since this driver uses only polling commands, we are by default in
> +	 * auto shutdown (ie, power-down) mode.
> +	 * So we do not have much to do here.
> +	 */
> +	chip->suspended = true;
> +
> +	mutex_unlock(&chip->lock);
> +	return 0;
> +}
> +
> +static int cm3218_resume(struct device *dev)
> +{
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +	struct cm3218_chip *chip = iio_priv(indio_dev);
> +	struct i2c_client *client = chip->client;
> +	int err;
> +
> +	mutex_lock(&chip->lock);
> +
> +	err = cm3218_chip_init(client);
> +	if (!err)
> +		chip->suspended = false;
> +
> +	mutex_unlock(&chip->lock);
> +	return err;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(cm3218_pm_ops, cm3218_suspend, cm3218_resume);
> +#define CM3218_PM_OPS (&cm3218_pm_ops)
> +#else
> +#define CM3218_PM_OPS NULL
> +#endif
> +
> +static const struct i2c_device_id cm3218_id[] = {
> +	{"cm3218", 0},
> +	{}
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, cm3218_id);
> +
> +static const struct of_device_id cm3218_of_match[] = {
> +	{ .compatible = "invn,cm3218", },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, cm3218_of_match);
> +
> +static struct i2c_driver cm3218_driver = {
> +	.class	= I2C_CLASS_HWMON,
> +	.driver	 = {
> +			.name = "cm3218",
> +			.pm = CM3218_PM_OPS,
> +			.owner = THIS_MODULE,
> +			.of_match_table = cm3218_of_match,
> +		    },
> +	.probe		= cm3218_probe,
> +	.remove		= cm3218_remove,
> +	.id_table       = cm3218_id,
> +	.detect	 = cm3218_detect,
> +	.address_list   = normal_i2c,
> +};
> +module_i2c_driver(cm3218_driver);
> +
> +MODULE_DESCRIPTION("CM3218 Ambient Light Sensor driver");
> +MODULE_LICENSE("GPL");
> 

-- 

Peter Meerwald
+43-664-2444418 (mobile)
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