Re: [RFC][PATCHv3 1/2] SFH7741: proximity sensor driver support

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On Wed, May 12, 2010 at 08:56:19PM +0530, Datta, Shubhrajyoti wrote:
> 
> Driver support for the proximity sensor SFH7741.
> 
> Signed-off-by: Shubhrajyoti D <shubhrajyoti@xxxxxx>
> ---
>  drivers/input/misc/Kconfig    |    9 ++
>  drivers/input/misc/Makefile   |    1 +
>  drivers/input/misc/sfh7741.c  |  256 +++++++++++++++++++++++++++++++++++++++++
>  include/linux/input/sfh7741.h |   39 ++++++
>  4 files changed, 305 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/input/misc/sfh7741.c
>  create mode 100644 include/linux/input/sfh7741.h
> 
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index 23140a3..ff30196 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -340,4 +340,13 @@ config INPUT_PCAP
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called pcap_keys.
>  
> +config SENSORS_SFH7741
> +	tristate "Proximity sensor"

Better name for the user: "SFH7741 Proximity sensor"

> +	default n

Just drop "default" altogether - it will be the same as "default n"

> +	help
> +	  Say Y here if you want to use proximity sensor sfh7741.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called sfh7741.
> +
>  endif
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 7e95a5d..5fea200 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -32,4 +32,5 @@ obj-$(CONFIG_INPUT_WINBOND_CIR)		+= winbond-cir.o
>  obj-$(CONFIG_INPUT_WISTRON_BTNS)	+= wistron_btns.o
>  obj-$(CONFIG_INPUT_WM831X_ON)		+= wm831x-on.o
>  obj-$(CONFIG_INPUT_YEALINK)		+= yealink.o
> +obj-$(CONFIG_SENSORS_SFH7741)		+= sfh7741.o
>  
> diff --git a/drivers/input/misc/sfh7741.c b/drivers/input/misc/sfh7741.c
> new file mode 100644
> index 0000000..3f54e98
> --- /dev/null
> +++ b/drivers/input/misc/sfh7741.c
> @@ -0,0 +1,256 @@
> +/*
> + * sfh7741.c

No file names in the sources please - they tend to get renamed and moved
around.

> + *
> + * SFH7741 Proximity Driver
> + *
> + * Copyright (C) 2010 Texas Instruments
> + *
> + * Author: Shubhrajyoti Datta <shubhrajyoti@xxxxxx>
> + *
> + * 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + */
> +
> +#include <linux/interrupt.h>
> +#include <linux/pm.h>
> +#include <linux/platform_device.h>
> +#include <linux/input.h>
> +#include <linux/input/sfh7741.h>
> +#include <linux/slab.h>
> +
> +struct sfh7741_drvdata {
> +	struct input_dev *input;
> +	int irq;
> +	int prox_enable;
> +	/* mutex for sysfs operations */
> +	struct mutex lock;
> +	void (*activate_func)(int state);
> +	int (*read_prox)(void);
> +};
> +
> +static irqreturn_t sfh7741_isr(int irq, void *dev_id)
> +{
> +	struct sfh7741_drvdata *ddata = dev_id;
> +	int proximity;
> +
> +	proximity = ddata->read_prox();
> +	input_report_abs(ddata->input, ABS_DISTANCE, proximity);
> +	input_sync(ddata->input);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static ssize_t set_prox_state(struct device *dev,
> +				struct device_attribute *attr,
> +				const char *buf, size_t count)
> +{
> +	int state;
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct sfh7741_drvdata *ddata = platform_get_drvdata(pdev);
> +
> +	if (sscanf(buf, "%u", &state) != 1)
> +		return -EINVAL;
> +
> +	if ((state != 1) && (state != 0))
> +		return -EINVAL;
> +
> +	ddata->activate_func(state);
> +
> +	mutex_lock(&ddata->lock);
> +	if (state != ddata->prox_enable) {
> +		if (state)
> +			enable_irq(ddata->irq);
> +		else
> +			disable_irq(ddata->irq);
> +		ddata->prox_enable = state;
> +	}
> +	mutex_unlock(&ddata->lock);
> +	return strnlen(buf, count);
> +}
> +
> +static ssize_t show_prox_state(struct device *dev,
> +			struct device_attribute *attr,
> +			char *buf)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct sfh7741_drvdata *ddata = platform_get_drvdata(pdev);
> +	return sprintf(buf, "%u\n", ddata->prox_enable);
> +}
> +static DEVICE_ATTR(state, S_IWUSR | S_IRUGO, show_prox_state, set_prox_state);
> +

Why is this needed in sysfs? Implement open and close methods for input
device and be done with it.

> +static ssize_t show_proximity(struct device *dev,
> +			struct device_attribute *attr,
> +			char *buf)
> +{
> +	int proximity;
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct sfh7741_drvdata *ddata = platform_get_drvdata(pdev);
> +	proximity = ddata->read_prox();
> +	return sprintf(buf, "%u\n", proximity);
> +}
> +static DEVICE_ATTR(proximity, S_IRUGO, show_proximity, NULL);

Why is this needed in sysfs? You can read current value via EVIOCGABS
ioctl.

> +
> +static struct attribute *sfh7741_attributes[] = {
> +	&dev_attr_state.attr,
> +	&dev_attr_proximity.attr,
> +	NULL
> +};
> +
> +static const struct attribute_group sfh7741_attr_group = {
> +	.attrs = sfh7741_attributes,
> +};
> +
> +static int __devinit sfh7741_probe(struct platform_device *pdev)
> +{
> +	struct sfh7741_platform_data *pdata = pdev->dev.platform_data;
> +	struct sfh7741_drvdata *ddata;
> +	struct device *dev = &pdev->dev;
> +	struct input_dev *input;
> +	int  error;
> +	char *desc = "sfh7741";
> +
> +	pr_info("SFH7741: Proximity sensor\n");

Input core will emit message when input device is registered, that
should be enough.

> +
> +	ddata = kzalloc(sizeof(struct sfh7741_drvdata),
> +			GFP_KERNEL);
> +	input = input_allocate_device();
> +	if (!ddata || !input) {
> +		dev_err(dev, "failed to allocate input device\n");

You are leaking either ddata or input here.

> +		return -ENOMEM;
> +	}
> +
> +	input->name = pdev->name;
> +	input->phys = "sfh7741/input0";
> +	input->dev.parent = &pdev->dev;
> +
> +	input->id.bustype = BUS_HOST;
> +	ddata->irq = pdata->irq;
> +	ddata->prox_enable = pdata->prox_enable;
> +	if (!pdata->activate_func || !pdata->read_prox) {
> +		dev_err(dev, "The activate and read func not allocated\n");
> +		kfree(ddata);

Leaging input. Also, why don't you check pdata valididty first, before
allocating resources.

> +		return -EINVAL;
> +	}
> +
> +	ddata->activate_func = pdata->activate_func;
> +	ddata->read_prox =  pdata->read_prox;
> +
> +	ddata->input = input;
> +	__set_bit(EV_ABS, input->evbit);
> +
> +	input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
> +
> +	error = input_register_device(input);
> +	if (error) {
> +		dev_err(dev, "Unable to register input device,error: %d\n"
> +				, error);

Wierd formatting, comma usually goes on previous line.

> +		goto fail1;
> +	}
> +
> +	platform_set_drvdata(pdev, ddata);
> +
> +	error = request_threaded_irq(pdata->irq , NULL ,
> +				sfh7741_isr,
> +				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
> +				| IRQF_ONESHOT,

Edge-triggered IRQ in oneshot mode? This is quite wierd. Also, do you
expect the read_prox() to sleep?

> +				desc, ddata);
> +	if (error) {
> +		dev_err(dev, "Unable to claim irq %d; error %d\n",
> +			pdata->irq, error);
> +		goto fail2;
> +	}
> +
> +	mutex_init(&ddata->lock);
> +	error = sysfs_create_group(&dev->kobj, &sfh7741_attr_group);
> +	if (error) {
> +		dev_err(dev, "failed to create sysfs entries\n");
> +		mutex_destroy(&ddata->lock);
> +	}
> +

I'd rather you dit not add driver specific interfaces, these sysfs
attributes must go.

> +	return 0;
> +
> +fail2:
> +	input_unregister_device(input);
> +	platform_set_drvdata(pdev, NULL);
> +fail1:
> +	input_free_device(input);

You may not call input_free_device() after input_unregister_device().

> +	kfree(ddata);
> +	return error;
> +
> +}
> +
> +static int __devexit sfh7741_remove(struct platform_device *pdev)
> +{
> +	struct sfh7741_drvdata *ddata = platform_get_drvdata(pdev);
> +	struct device *dev = &pdev->dev;
> +	mutex_destroy(&ddata->lock);
> +	sysfs_remove_group(&dev->kobj, &sfh7741_attr_group);
> +	free_irq(ddata->irq, (void *)ddata);
> +	input_unregister_device(ddata->input);
> +	kfree(ddata);
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +static int sfh7741_suspend(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct sfh7741_drvdata *ddata = platform_get_drvdata(pdev);
> +	ddata->activate_func(0);
> +	return 0;
> +}
> +
> +static int sfh7741_resume(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct sfh7741_drvdata *ddata = platform_get_drvdata(pdev);
> +	ddata->activate_func(1);
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops sfh7741_pm_ops = {
> +	.suspend	= sfh7741_suspend,
> +	.resume		= sfh7741_resume,
> +};
> +#endif
> +
> +static struct platform_driver sfh7741_device_driver = {
> +	.probe		= sfh7741_probe,
> +	.remove		= __devexit_p(sfh7741_remove),
> +	.driver		= {
> +		.name	= "sfh7741",
> +		.owner	= THIS_MODULE,
> +#ifdef CONFIG_PM
> +		.pm	= &sfh7741_pm_ops,
> +#endif
> +	}
> +};
> +
> +static int __init sfh7741_init(void)
> +{
> +	return platform_driver_register(&sfh7741_device_driver);
> +}
> +
> +static void __exit sfh7741_exit(void)
> +{
> +	platform_driver_unregister(&sfh7741_device_driver);
> +}
> +
> +module_init(sfh7741_init);
> +module_exit(sfh7741_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Texas Instruments");
> +MODULE_DESCRIPTION("Proximity sensor SFH7741 driver");
> +MODULE_ALIAS("platform:sfh7741");
> +
> diff --git a/include/linux/input/sfh7741.h b/include/linux/input/sfh7741.h
> new file mode 100644
> index 0000000..18868e0
> --- /dev/null
> +++ b/include/linux/input/sfh7741.h
> @@ -0,0 +1,39 @@
> +/*
> + * sfh7741.h
> + * SFH7741 Proximity sensor driver
> + *
> + * Copyright (C) 2010 Texas Instruments
> + * Author: Shubhrajyoti D <shubhrajyoti@xxxxxx>
> + *
> + * 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 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, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef __SFH7741_H
> +#define __SFH7741_H
> +
> +/*
> + * struct sfh7741_platform_data - SFH7741 Platform data
> + * @irq: IRQ assigned
> + * @prox_enable: State of the sensor
> + * @activate_func: function called to activate/deactivate the sensor
> + * @read_prox: function to read the sensor output
> + */
> +struct sfh7741_platform_data {
> +	int irq;
> +	int prox_enable;
> +	void (*activate_func)(int state);
> +	int (*read_prox)(void);
> +};
> +
> +#endif
> +

-- 
Dmitry
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