[RFC][PATCHv2 1/2] SFH7741: proximity sensor driver support

["Datta, Shubhrajyoti" <shubhrajyoti@ti.com>]

Driver support for the proximity sensor SFH7741.

Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
---
 drivers/input/misc/Kconfig    |    9 ++
 drivers/input/misc/Makefile   |    1 +
 drivers/input/misc/sfh7741.c  |  256 +++++++++++++++++++++++++++++++++++++++++
 include/linux/input/sfh7741.h |   16 +++
 4 files changed, 282 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..925dca3 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"
+	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 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..cde4d1b
--- /dev/null
+++ b/drivers/input/misc/sfh7741.c
@@ -0,0 +1,256 @@
+/*
+ * sfh7741.c
+ *
+ * SFH7741 Proximity Driver
+ *
+ * Copyright (C) 2010 Texas Instruments
+ *
+ * Author: Shubhrajyoti Datta <shubhrajyoti@ti.com>
+ *
+ * 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);
+
+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);
+
+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");
+
+	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->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");
+		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);
+		goto fail1;
+	}
+
+	platform_set_drvdata(pdev, ddata);
+
+	error = request_threaded_irq(pdata->irq , 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",
+			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);
+		free_irq(pdata->irq, &ddata);
+	}
+
+	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);
+	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 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..d8894e0
--- /dev/null
+++ b/include/linux/input/sfh7741.h
@@ -0,0 +1,16 @@
+/*
+ * Configuration and driver data for Proximity driver.
+ */
+
+#ifndef __SFH7741_H
+#define __SFH7741_H
+
+struct sfh7741_platform_data {
+	int irq;
+	int prox_enable;
+	void (*activate_func)(int state);
+	int (*read_prox)(void);
+};
+
+#endif
+
-- 
1.5.4.7