[media] rc: Add support for GPIO based IR Receiver driver

Adds GPIO based IR Receiver driver. It decodes signals using decoders
available in rc framework.

Signed-off-by: Ravi Kumar V <kumarrav@codeaurora.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 215 insertions, 0 deletions

diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index 4df4affeea5f..a3fbb21350e9 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -266,4 +266,13 @@ config RC_LOOPBACK
            To compile this driver as a module, choose M here: the module will
            be called rc_loopback.
 
+config IR_GPIO_CIR
+        tristate "GPIO IR remote control"
+        depends on RC_CORE
+        ---help---
+           Say Y if you want to use GPIO based IR Receiver.
+
+           To compile this driver as a module, choose M here: the module will
+           be called gpio-ir-recv.
+
 endif #RC_CORE
diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
index fb3dee2dd845..29f364f88a94 100644
--- a/drivers/media/rc/Makefile
+++ b/drivers/media/rc/Makefile
@@ -26,3 +26,4 @@ obj-$(CONFIG_IR_REDRAT3) += redrat3.o
 obj-$(CONFIG_IR_STREAMZAP) += streamzap.o
 obj-$(CONFIG_IR_WINBOND_CIR) += winbond-cir.o
 obj-$(CONFIG_RC_LOOPBACK) += rc-loopback.o
+obj-$(CONFIG_IR_GPIO_CIR) += gpio-ir-recv.o
diff --git a/drivers/media/rc/gpio-ir-recv.c b/drivers/media/rc/gpio-ir-recv.c
new file mode 100644
index 000000000000..6744479a5389
--- /dev/null
+++ b/drivers/media/rc/gpio-ir-recv.c
@@ -0,0 +1,205 @@
+/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+#include <media/rc-core.h>
+#include <media/gpio-ir-recv.h>
+
+#define GPIO_IR_DRIVER_NAME     "gpio-rc-recv"
+#define GPIO_IR_DEVICE_NAME     "gpio_ir_recv"
+
+struct gpio_rc_dev {
+        struct rc_dev *rcdev;
+        unsigned int gpio_nr;
+        bool active_low;
+};
+
+static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
+{
+        struct gpio_rc_dev *gpio_dev = dev_id;
+        unsigned int gval;
+        int rc = 0;
+        enum raw_event_type type = IR_SPACE;
+
+        gval = gpio_get_value_cansleep(gpio_dev->gpio_nr);
+
+        if (gval < 0)
+                goto err_get_value;
+
+        if (gpio_dev->active_low)
+                gval = !gval;
+
+        if (gval == 1)
+                type = IR_PULSE;
+
+        rc = ir_raw_event_store_edge(gpio_dev->rcdev, type);
+        if (rc < 0)
+                goto err_get_value;
+
+        ir_raw_event_handle(gpio_dev->rcdev);
+
+err_get_value:
+        return IRQ_HANDLED;
+}
+
+static int __devinit gpio_ir_recv_probe(struct platform_device *pdev)
+{
+        struct gpio_rc_dev *gpio_dev;
+        struct rc_dev *rcdev;
+        const struct gpio_ir_recv_platform_data *pdata =
+                                        pdev->dev.platform_data;
+        int rc;
+
+        if (!pdata)
+                return -EINVAL;
+
+        if (pdata->gpio_nr < 0)
+                return -EINVAL;
+
+        gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL);
+        if (!gpio_dev)
+                return -ENOMEM;
+
+        rcdev = rc_allocate_device();
+        if (!rcdev) {
+                rc = -ENOMEM;
+                goto err_allocate_device;
+        }
+
+        rcdev->driver_type = RC_DRIVER_IR_RAW;
+        rcdev->allowed_protos = RC_TYPE_ALL;
+        rcdev->input_name = GPIO_IR_DEVICE_NAME;
+        rcdev->input_id.bustype = BUS_HOST;
+        rcdev->driver_name = GPIO_IR_DRIVER_NAME;
+        rcdev->map_name = RC_MAP_EMPTY;
+
+        gpio_dev->rcdev = rcdev;
+        gpio_dev->gpio_nr = pdata->gpio_nr;
+        gpio_dev->active_low = pdata->active_low;
+
+        rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
+        if (rc < 0)
+                goto err_gpio_request;
+        rc  = gpio_direction_input(pdata->gpio_nr);
+        if (rc < 0)
+                goto err_gpio_direction_input;
+
+        rc = rc_register_device(rcdev);
+        if (rc < 0) {
+                dev_err(&pdev->dev, "failed to register rc device\n");
+                goto err_register_rc_device;
+        }
+
+        platform_set_drvdata(pdev, gpio_dev);
+
+        rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr),
+                                gpio_ir_recv_irq,
+                        IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+                                        "gpio-ir-recv-irq", gpio_dev);
+        if (rc < 0)
+                goto err_request_irq;
+
+        return 0;
+
+err_request_irq:
+        platform_set_drvdata(pdev, NULL);
+        rc_unregister_device(rcdev);
+err_register_rc_device:
+err_gpio_direction_input:
+        gpio_free(pdata->gpio_nr);
+err_gpio_request:
+        rc_free_device(rcdev);
+        rcdev = NULL;
+err_allocate_device:
+        kfree(gpio_dev);
+        return rc;
+}
+
+static int __devexit gpio_ir_recv_remove(struct platform_device *pdev)
+{
+        struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
+
+        free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
+        platform_set_drvdata(pdev, NULL);
+        rc_unregister_device(gpio_dev->rcdev);
+        gpio_free(gpio_dev->gpio_nr);
+        rc_free_device(gpio_dev->rcdev);
+        kfree(gpio_dev);
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int gpio_ir_recv_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
+
+        if (device_may_wakeup(dev))
+                enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
+        else
+                disable_irq(gpio_to_irq(gpio_dev->gpio_nr));
+
+        return 0;
+}
+
+static int gpio_ir_recv_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
+
+        if (device_may_wakeup(dev))
+                disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
+        else
+                enable_irq(gpio_to_irq(gpio_dev->gpio_nr));
+
+        return 0;
+}
+
+static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
+        .suspend        = gpio_ir_recv_suspend,
+        .resume         = gpio_ir_recv_resume,
+};
+#endif
+
+static struct platform_driver gpio_ir_recv_driver = {
+        .probe  = gpio_ir_recv_probe,
+        .remove = __devexit_p(gpio_ir_recv_remove),
+        .driver = {
+                .name   = GPIO_IR_DRIVER_NAME,
+                .owner  = THIS_MODULE,
+#ifdef CONFIG_PM
+                .pm     = &gpio_ir_recv_pm_ops,
+#endif
+        },
+};
+
+static int __init gpio_ir_recv_init(void)
+{
+        return platform_driver_register(&gpio_ir_recv_driver);
+}
+module_init(gpio_ir_recv_init);
+
+static void __exit gpio_ir_recv_exit(void)
+{
+        platform_driver_unregister(&gpio_ir_recv_driver);
+}
+module_exit(gpio_ir_recv_exit);
+
+MODULE_DESCRIPTION("GPIO IR Receiver driver");
+MODULE_LICENSE("GPL v2");