> -----Original Message-----
> From: V, Hemanth
> Sent: Monday, May 03, 2010 1:27 PM
> To: Datta, Shubhrajyoti; linux-input@xxxxxxxxxxxxxxx; linux-
> omap@xxxxxxxxxxxxxxx
> Subject: Re: [RFC][PATCH1/2] SFH7741: proximity sensor driver support
>
> ----- Original Message -----
> From: "Datta, Shubhrajyoti" <shubhrajyoti@xxxxxx>
> >
> > From: Datta, Shubhrajyoti
> > Sent: Monday, May 03, 2010 11:07 AM
> > To: Datta, Shubhrajyoti
> > Subject: [RFC][PATCH1/2] SFH7741: proximity sensor driver support
> >
> > Driver support for the proximity sensor SFH7741.
> >
> > Signed-off-by: Shubhro <a0393217@xxxxxx>
> > ---
> > drivers/input/misc/Kconfig | 9 ++
> > drivers/input/misc/Makefile | 1 +
> > drivers/input/misc/sfh7741.c | 308
> > +++++++++++++++++++++++++++++++++++++++++
> > include/linux/input/sfh7741.h | 14 ++
> > 4 files changed, 332 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 16ec523..5919358 100644
> > --- a/drivers/input/misc/Kconfig
> > +++ b/drivers/input/misc/Kconfig
> > @@ -319,4 +319,13 @@ 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"
> > + default y
> > + 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 a8b8485..b2cac12 100644
> > --- a/drivers/input/misc/Makefile
> > +++ b/drivers/input/misc/Makefile
> > @@ -30,4 +30,5 @@ 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..b4febfe
> > --- /dev/null
> > +++ b/drivers/input/misc/sfh7741.c
> > @@ -0,0 +1,308 @@
> > +/*
> > + * sfh7741.c
> > + *
> > + * SFH7741 Proximity Driver
> > + *
> > + * Copyright (C) 2010 Texas Instruments
> > + *
> > + * Author: Shubhrajyoti Datta <a0393217@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/gpio.h>
> > +#include <linux/input/sfh7741.h>
> > +
> > +struct sfh7741_drvdata {
> > + struct input_dev *input;
> > + int proximity_out;
> > + int gpio_en;
> > +};
> > +
> > +static DEFINE_MUTEX(prox_enable_mutex);
>
> This mutex can be included as part of driver data structure
>
> > +static int prox_enable = 1;
>
> Same comment as above
Agreed.
>
> > +
> > +static irqreturn_t sfh7741_isr(int irq, void *dev_id)
> > +{
> > + struct sfh7741_drvdata *ddata = dev_id;
> > +
> > + int proximity = gpio_get_value(ddata->proximity_out);
> > + input_report_abs(ddata->input, ABS_DISTANCE, proximity);
> > + input_sync(ddata->input);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int __devinit sfh7741_setup(struct device *dev,
> > + struct sfh7741_drvdata *ddata
> > + )
> > +{
> > + int error;
> > + char *desc = "sfh7741";
> > +
> > + error = gpio_request(ddata->proximity_out, desc);
> > + if (error < 0) {
> > + dev_err(dev, "failed to request GPIO %d, error %d\n",
> > + ddata->proximity_out, error);
> > + return error;
> > + }
> > +
> > + error = gpio_direction_input(ddata->proximity_out);
> > + if (error < 0) {
> > + dev_err(dev, "failed to configure direction for GPIO %d,\
> > + error %d\n", ddata->proximity_out, error);
> > + goto fail1;
> > + }
> > +
>
> General comment about GPIO,
> It might be better to have GPIO configuration as part of board file,
> rather than being part of the driver. This is should make the driver
> more generic.
I read GPIO in the ISR how can I take care of that?
>
> > + error = request_threaded_irq(gpio_to_irq(ddata->proximity_out) , NULL
> ,
> > + sfh7741_isr,
> > + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
> > + | IRQF_ONESHOT,
> > + desc, ddata);
> > + if (error) {
> > + dev_err(dev, "Unable to claim irq %d; error %d\n",
> > + gpio_to_irq(ddata->proximity_out), error);
> > + goto fail1;
> > + }
> > +
> > + error = gpio_request(ddata->gpio_en, desc);
> > + if (error < 0) {
> > + dev_err(dev, "failed to request GPIO %d, error %d\n",
> > + ddata->gpio_en, error);
> > + goto fail2;
> > + }
> > +
> > + error = gpio_direction_output(ddata->gpio_en , 1);
> > + if (error < 0) {
> > + dev_err(dev, "%s: GPIO configuration failed: GPIO %d,\
> > + error %d\n",__func__, ddata->gpio_en, error);
> > + goto fail3;
> > + }
> > + return 0;
> > +
> > +fail3:
> > + gpio_free(ddata->gpio_en);
> > +fail2:
> > + free_irq(gpio_to_irq(ddata->proximity_out), &ddata);
> > +fail1:
> > + gpio_free(ddata->proximity_out);
> > + return error;
> > +}
> > +
> > +static ssize_t set_prox_state(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + int state , error;
> > + 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;
> > +
> > + error = gpio_direction_output(ddata->gpio_en , state);
> > + if (error < 0) {
> > + dev_err(dev, "%s: GPIO configuration failed: GPIO %d,\
> > + error %d\n",__func__, ddata->gpio_en, error);
> > + }
> > + mutex_lock(&prox_enable_mutex);
> > + if (state != prox_enable) {
> > + if (state)
> > + enable_irq(gpio_to_irq(ddata->proximity_out));
> > + else
> > + disable_irq(gpio_to_irq(ddata->proximity_out));
> > + prox_enable = state;
> > + }
> > + mutex_unlock(&prox_enable_mutex);
> > + return strnlen(buf, count);
> > +}
> > +
> > +static ssize_t show_prox_state(struct device *dev,
> > + struct device_attribute *attr,
> > + char *buf)
> > +{
> > + return sprintf(buf, "%u\n", prox_enable);
> > +}
> > +static DEVICE_ATTR(state, S_IWUSR | S_IRUGO, show_prox_state,
> > set_prox_state);
> > +
> > +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 = gpio_get_value(ddata->proximity_out);
> > + return sprintf(buf, "%u\n", proximity);
> > +}
> > +static DEVICE_ATTR(proximity, S_IRUGO, show_proximity, NULL);
> > +
> > +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;
> > +
> > + pr_info("SFH7741: Proximity sensor\n");
> > +
> > + ddata = kzalloc(sizeof(struct sfh7741_drvdata),
> > + GFP_KERNEL);
> > + input = input_allocate_device();
> > + if (!ddata || !input) {
> > + dev_err(dev, "failed to allocate input device\n");
> > + return -ENOMEM;
> > + }
> > +
> > + input->name = pdev->name;
> > + input->phys = "sfh7741/input0";
> > + input->dev.parent = &pdev->dev;
> > +
> > + input->id.bustype = BUS_HOST;
> > + ddata->proximity_out = pdata->gpio_intr;
> > + ddata->gpio_en = pdata->gpio_en;
> > +
> > + 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);
> > + goto fail1;
> > + }
> > +
> > + platform_set_drvdata(pdev, ddata);
> > + error = sfh7741_setup(dev, ddata);
> > + if (error)
> > + goto fail2;
> > +
> > + error = sysfs_create_group(&dev->kobj, &sfh7741_attr_group);
> > + if (error)
> > + dev_err(dev, "failed to create sysfs entries \n");
> > +
> > + return 0;
> > +
> > +fail2:
> > + input_unregister_device(input);
> > + platform_set_drvdata(pdev, NULL);
> > +fail1:
> > + input_free_device(input);
> > + kfree(ddata);
> > + return error;
> > +
> > +}
> > +
> > +static int __devexit sfh7741_remove(struct platform_device *pdev)
> > +{
> > + struct sfh7741_drvdata *ddata = platform_get_drvdata(pdev);
> > + int irq ;
> > + struct device *dev = &pdev->dev;
> > +
> > + sysfs_remove_group(&dev->kobj, &sfh7741_attr_group);
> > + gpio_free(ddata->gpio_en);
> > +
> > + irq = gpio_to_irq(ddata->proximity_out);
> > + free_irq(irq, (void *)ddata);
> > + gpio_free(ddata->proximity_out);
> > +
> > + 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);
> > +
> > + error = gpio_direction_output(ddata->gpio_en , 0);
> > + if (error < 0) {
> > + dev_err(dev, "%s: GPIO configuration failed: GPIO %d,\
> > + error %d\n",__func__, ddata->gpio_en, error);
> > + }
> > + 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);
> > +
> > + error = gpio_direction_output(ddata->gpio_en , 1);
> > + if (error < 0) {
> > + dev_err(dev, "%s: GPIO configuration failed: GPIO %d,\
> > + error %d\n",__func__, ddata->gpio_en, error);
> > + }
> > + 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 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..801c971
> > --- /dev/null
> > +++ b/include/linux/input/sfh7741.h
> > @@ -0,0 +1,14 @@
> > +/*
> > + * Configuration and driver data for Proximity driver.
> > + */
> > +
> > +#ifndef __SFH7741_H
> > +#define __SFH7741_H
> > +
> > +struct sfh7741_platform_data {
> > + int gpio_intr;
> > + int gpio_en;
> > +};
> > +
> > +#endif
> > +
> > --
> > 1.5.4.7
> >
> > --
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