diff options
Diffstat (limited to 'drivers/media/rc/gpio-ir-recv.c')
| -rw-r--r-- | drivers/media/rc/gpio-ir-recv.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/media/rc/gpio-ir-recv.c b/drivers/media/rc/gpio-ir-recv.c new file mode 100644 index 000000000000..0d875450c5ce --- /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; + 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; + 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"); |