1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
5 #include <linux/kernel.h>
6 #include <linux/init.h>
7 #include <linux/module.h>
8 #include <linux/interrupt.h>
9 #include <linux/gpio/consumer.h>
10 #include <linux/slab.h>
12 #include <linux/of_gpio.h>
13 #include <linux/platform_device.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/pm_qos.h>
16 #include <linux/irq.h>
17 #include <media/rc-core.h>
19 #define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
23 struct gpio_desc *gpiod;
26 struct pm_qos_request qos;
29 static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
32 struct gpio_rc_dev *gpio_dev = dev_id;
33 struct device *pmdev = gpio_dev->pmdev;
36 * For some cpuidle systems, not all:
37 * Respond to interrupt taking more latency when cpu in idle.
38 * Invoke asynchronous pm runtime get from interrupt context,
39 * this may introduce a millisecond delay to call resume callback,
40 * where to disable cpuilde.
42 * Two issues lead to fail to decode first frame, one is latency to
43 * respond to interrupt, another is delay introduced by async api.
46 pm_runtime_get(pmdev);
48 val = gpiod_get_value(gpio_dev->gpiod);
50 ir_raw_event_store_edge(gpio_dev->rcdev, val == 1);
53 pm_runtime_mark_last_busy(pmdev);
54 pm_runtime_put_autosuspend(pmdev);
60 static int gpio_ir_recv_probe(struct platform_device *pdev)
62 struct device *dev = &pdev->dev;
63 struct device_node *np = dev->of_node;
64 struct gpio_rc_dev *gpio_dev;
72 gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL);
76 gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
77 if (IS_ERR(gpio_dev->gpiod)) {
78 rc = PTR_ERR(gpio_dev->gpiod);
79 /* Just try again if this happens */
80 if (rc != -EPROBE_DEFER)
81 dev_err(dev, "error getting gpio (%d)\n", rc);
84 gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod);
85 if (gpio_dev->irq < 0)
88 rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
92 rcdev->priv = gpio_dev;
93 rcdev->device_name = GPIO_IR_DEVICE_NAME;
94 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
95 rcdev->input_id.bustype = BUS_HOST;
96 rcdev->input_id.vendor = 0x0001;
97 rcdev->input_id.product = 0x0001;
98 rcdev->input_id.version = 0x0100;
99 rcdev->dev.parent = dev;
100 rcdev->driver_name = KBUILD_MODNAME;
101 rcdev->min_timeout = 1;
102 rcdev->timeout = IR_DEFAULT_TIMEOUT;
103 rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
104 rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
105 rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL);
106 if (!rcdev->map_name)
107 rcdev->map_name = RC_MAP_EMPTY;
109 gpio_dev->rcdev = rcdev;
111 rc = devm_rc_register_device(dev, rcdev);
113 dev_err(dev, "failed to register rc device (%d)\n", rc);
117 of_property_read_u32(np, "linux,autosuspend-period", &period);
119 gpio_dev->pmdev = dev;
120 pm_runtime_set_autosuspend_delay(dev, period);
121 pm_runtime_use_autosuspend(dev);
122 pm_runtime_set_suspended(dev);
123 pm_runtime_enable(dev);
126 platform_set_drvdata(pdev, gpio_dev);
128 return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq,
129 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
130 "gpio-ir-recv-irq", gpio_dev);
134 static int gpio_ir_recv_suspend(struct device *dev)
136 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
138 if (device_may_wakeup(dev))
139 enable_irq_wake(gpio_dev->irq);
141 disable_irq(gpio_dev->irq);
146 static int gpio_ir_recv_resume(struct device *dev)
148 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
150 if (device_may_wakeup(dev))
151 disable_irq_wake(gpio_dev->irq);
153 enable_irq(gpio_dev->irq);
158 static int gpio_ir_recv_runtime_suspend(struct device *dev)
160 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
162 cpu_latency_qos_remove_request(&gpio_dev->qos);
167 static int gpio_ir_recv_runtime_resume(struct device *dev)
169 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
171 cpu_latency_qos_add_request(&gpio_dev->qos, 0);
176 static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
177 .suspend = gpio_ir_recv_suspend,
178 .resume = gpio_ir_recv_resume,
179 .runtime_suspend = gpio_ir_recv_runtime_suspend,
180 .runtime_resume = gpio_ir_recv_runtime_resume,
184 static const struct of_device_id gpio_ir_recv_of_match[] = {
185 { .compatible = "gpio-ir-receiver", },
188 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
190 static struct platform_driver gpio_ir_recv_driver = {
191 .probe = gpio_ir_recv_probe,
193 .name = KBUILD_MODNAME,
194 .of_match_table = of_match_ptr(gpio_ir_recv_of_match),
196 .pm = &gpio_ir_recv_pm_ops,
200 module_platform_driver(gpio_ir_recv_driver);
202 MODULE_DESCRIPTION("GPIO IR Receiver driver");
203 MODULE_LICENSE("GPL v2");