diff options
Diffstat (limited to 'kernel/drivers/media/rc/gpio-ir-recv.c')
| -rw-r--r-- | kernel/drivers/media/rc/gpio-ir-recv.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/kernel/drivers/media/rc/gpio-ir-recv.c b/kernel/drivers/media/rc/gpio-ir-recv.c new file mode 100644 index 000000000..229853d68 --- /dev/null +++ b/kernel/drivers/media/rc/gpio-ir-recv.c @@ -0,0 +1,252 @@ +/* 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/of.h> +#include <linux/of_gpio.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; +}; + +#ifdef CONFIG_OF +/* + * Translate OpenFirmware node properties into platform_data + */ +static int gpio_ir_recv_get_devtree_pdata(struct device *dev, + struct gpio_ir_recv_platform_data *pdata) +{ + struct device_node *np = dev->of_node; + enum of_gpio_flags flags; + int gpio; + + gpio = of_get_gpio_flags(np, 0, &flags); + if (gpio < 0) { + if (gpio != -EPROBE_DEFER) + dev_err(dev, "Failed to get gpio flags (%d)\n", gpio); + return gpio; + } + + pdata->gpio_nr = gpio; + pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW); + /* probe() takes care of map_name == NULL or allowed_protos == 0 */ + pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL); + pdata->allowed_protos = 0; + + return 0; +} + +static struct of_device_id gpio_ir_recv_of_match[] = { + { .compatible = "gpio-ir-receiver", }, + { }, +}; +MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match); + +#else /* !CONFIG_OF */ + +#define gpio_ir_recv_get_devtree_pdata(dev, pdata) (-ENOSYS) + +#endif + +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 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 (pdev->dev.of_node) { + struct gpio_ir_recv_platform_data *dtpdata = + devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL); + if (!dtpdata) + return -ENOMEM; + rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata); + if (rc) + return rc; + pdata = dtpdata; + } + + 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->priv = gpio_dev; + rcdev->driver_type = RC_DRIVER_IR_RAW; + rcdev->input_name = GPIO_IR_DEVICE_NAME; + rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0"; + rcdev->input_id.bustype = BUS_HOST; + rcdev->input_id.vendor = 0x0001; + rcdev->input_id.product = 0x0001; + rcdev->input_id.version = 0x0100; + rcdev->dev.parent = &pdev->dev; + rcdev->driver_name = GPIO_IR_DRIVER_NAME; + if (pdata->allowed_protos) + rcdev->allowed_protocols = pdata->allowed_protos; + else + rcdev->allowed_protocols = RC_BIT_ALL; + rcdev->map_name = pdata->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: + rc_unregister_device(rcdev); + rcdev = NULL; +err_register_rc_device: +err_gpio_direction_input: + gpio_free(pdata->gpio_nr); +err_gpio_request: + rc_free_device(rcdev); +err_allocate_device: + kfree(gpio_dev); + return rc; +} + +static int 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); + rc_unregister_device(gpio_dev->rcdev); + gpio_free(gpio_dev->gpio_nr); + 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 = gpio_ir_recv_remove, + .driver = { + .name = GPIO_IR_DRIVER_NAME, + .of_match_table = of_match_ptr(gpio_ir_recv_of_match), +#ifdef CONFIG_PM + .pm = &gpio_ir_recv_pm_ops, +#endif + }, +}; +module_platform_driver(gpio_ir_recv_driver); + +MODULE_DESCRIPTION("GPIO IR Receiver driver"); +MODULE_LICENSE("GPL v2"); |