[PATCH v3 1/1] rc: Add support for GPIO based IR Receiver driver.
Ravi Kumar V
kumarrav at codeaurora.org
Tue Feb 28 00:51:40 EST 2012
Adds GPIO based IR Receiver driver. It decodes signals using decoders
available in rc framework.
Signed-off-by: Ravi Kumar V <kumarrav at codeaurora.org>
---
drivers/media/rc/Kconfig | 9 ++
drivers/media/rc/Makefile | 1 +
drivers/media/rc/gpio-ir-recv.c | 205 +++++++++++++++++++++++++++++++++++++++
include/media/gpio-ir-recv.h | 22 ++++
4 files changed, 237 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/rc/gpio-ir-recv.c
create mode 100644 include/media/gpio-ir-recv.h
diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index aeb7f43..6f63ded 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -256,4 +256,13 @@ 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 2156e78..9b3568e 100644
--- a/drivers/media/rc/Makefile
+++ b/drivers/media/rc/Makefile
@@ -25,3 +25,4 @@ 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 0000000..6744479
--- /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");
diff --git a/include/media/gpio-ir-recv.h b/include/media/gpio-ir-recv.h
new file mode 100644
index 0000000..61a7fbb
--- /dev/null
+++ b/include/media/gpio-ir-recv.h
@@ -0,0 +1,22 @@
+/* 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.
+ */
+
+#ifndef __GPIO_IR_RECV_H__
+#define __GPIO_IR_RECV_H__
+
+struct gpio_ir_recv_platform_data {
+ unsigned int gpio_nr;
+ bool active_low;
+};
+
+#endif /* __GPIO_IR_RECV_H__ */
+
--
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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