1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
3 */
4
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>
11 #include <linux/of.h>
12 #include <linux/platform_device.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/pm_qos.h>
15 #include <linux/irq.h>
16 #include <media/rc-core.h>
17
18 #define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
19
20 struct gpio_rc_dev {
21 struct rc_dev *rcdev;
22 struct gpio_desc *gpiod;
23 int irq;
24 struct device *pmdev;
25 struct pm_qos_request qos;
26 };
27
gpio_ir_recv_irq(int irq,void * dev_id)28 static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
29 {
30 int val;
31 struct gpio_rc_dev *gpio_dev = dev_id;
32 struct device *pmdev = gpio_dev->pmdev;
33
34 /*
35 * For some cpuidle systems, not all:
36 * Respond to interrupt taking more latency when cpu in idle.
37 * Invoke asynchronous pm runtime get from interrupt context,
38 * this may introduce a millisecond delay to call resume callback,
39 * where to disable cpuilde.
40 *
41 * Two issues lead to fail to decode first frame, one is latency to
42 * respond to interrupt, another is delay introduced by async api.
43 */
44 if (pmdev)
45 pm_runtime_get(pmdev);
46
47 val = gpiod_get_value(gpio_dev->gpiod);
48 if (val >= 0)
49 ir_raw_event_store_edge(gpio_dev->rcdev, val == 1);
50
51 if (pmdev)
52 pm_runtime_put_autosuspend(pmdev);
53
54 return IRQ_HANDLED;
55 }
56
gpio_ir_recv_probe(struct platform_device * pdev)57 static int gpio_ir_recv_probe(struct platform_device *pdev)
58 {
59 struct device *dev = &pdev->dev;
60 struct device_node *np = dev->of_node;
61 struct gpio_rc_dev *gpio_dev;
62 struct rc_dev *rcdev;
63 u32 period = 0;
64 int rc;
65
66 if (!np)
67 return -ENODEV;
68
69 gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL);
70 if (!gpio_dev)
71 return -ENOMEM;
72
73 gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
74 if (IS_ERR(gpio_dev->gpiod))
75 return dev_err_probe(dev, PTR_ERR(gpio_dev->gpiod),
76 "error getting gpio\n");
77 gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod);
78 if (gpio_dev->irq < 0)
79 return gpio_dev->irq;
80
81 rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
82 if (!rcdev)
83 return -ENOMEM;
84
85 rcdev->priv = gpio_dev;
86 rcdev->device_name = GPIO_IR_DEVICE_NAME;
87 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
88 rcdev->input_id.bustype = BUS_HOST;
89 rcdev->input_id.vendor = 0x0001;
90 rcdev->input_id.product = 0x0001;
91 rcdev->input_id.version = 0x0100;
92 rcdev->dev.parent = dev;
93 rcdev->driver_name = KBUILD_MODNAME;
94 rcdev->min_timeout = 1;
95 rcdev->timeout = IR_DEFAULT_TIMEOUT;
96 rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
97 rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
98 rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL);
99 if (!rcdev->map_name)
100 rcdev->map_name = RC_MAP_EMPTY;
101
102 gpio_dev->rcdev = rcdev;
103 if (of_property_read_bool(np, "wakeup-source"))
104 device_init_wakeup(dev, true);
105
106 rc = devm_rc_register_device(dev, rcdev);
107 if (rc < 0) {
108 dev_err(dev, "failed to register rc device (%d)\n", rc);
109 return rc;
110 }
111
112 of_property_read_u32(np, "linux,autosuspend-period", &period);
113 if (period) {
114 gpio_dev->pmdev = dev;
115 pm_runtime_set_autosuspend_delay(dev, period);
116 pm_runtime_use_autosuspend(dev);
117 pm_runtime_set_suspended(dev);
118 pm_runtime_enable(dev);
119 }
120
121 platform_set_drvdata(pdev, gpio_dev);
122
123 return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq,
124 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
125 "gpio-ir-recv-irq", gpio_dev);
126 }
127
gpio_ir_recv_remove(struct platform_device * pdev)128 static void gpio_ir_recv_remove(struct platform_device *pdev)
129 {
130 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
131 struct device *pmdev = gpio_dev->pmdev;
132
133 if (pmdev) {
134 pm_runtime_get_sync(pmdev);
135 cpu_latency_qos_remove_request(&gpio_dev->qos);
136
137 pm_runtime_disable(pmdev);
138 pm_runtime_put_noidle(pmdev);
139 pm_runtime_set_suspended(pmdev);
140 }
141 }
142
143 #ifdef CONFIG_PM
gpio_ir_recv_suspend(struct device * dev)144 static int gpio_ir_recv_suspend(struct device *dev)
145 {
146 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
147
148 if (device_may_wakeup(dev))
149 enable_irq_wake(gpio_dev->irq);
150 else
151 disable_irq(gpio_dev->irq);
152
153 return 0;
154 }
155
gpio_ir_recv_resume(struct device * dev)156 static int gpio_ir_recv_resume(struct device *dev)
157 {
158 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
159
160 if (device_may_wakeup(dev))
161 disable_irq_wake(gpio_dev->irq);
162 else
163 enable_irq(gpio_dev->irq);
164
165 return 0;
166 }
167
gpio_ir_recv_runtime_suspend(struct device * dev)168 static int gpio_ir_recv_runtime_suspend(struct device *dev)
169 {
170 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
171
172 cpu_latency_qos_remove_request(&gpio_dev->qos);
173
174 return 0;
175 }
176
gpio_ir_recv_runtime_resume(struct device * dev)177 static int gpio_ir_recv_runtime_resume(struct device *dev)
178 {
179 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
180
181 cpu_latency_qos_add_request(&gpio_dev->qos, 0);
182
183 return 0;
184 }
185
186 static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
187 .suspend = gpio_ir_recv_suspend,
188 .resume = gpio_ir_recv_resume,
189 .runtime_suspend = gpio_ir_recv_runtime_suspend,
190 .runtime_resume = gpio_ir_recv_runtime_resume,
191 };
192 #endif
193
194 static const struct of_device_id gpio_ir_recv_of_match[] = {
195 { .compatible = "gpio-ir-receiver", },
196 { },
197 };
198 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
199
200 static struct platform_driver gpio_ir_recv_driver = {
201 .probe = gpio_ir_recv_probe,
202 .remove = gpio_ir_recv_remove,
203 .driver = {
204 .name = KBUILD_MODNAME,
205 .of_match_table = gpio_ir_recv_of_match,
206 #ifdef CONFIG_PM
207 .pm = &gpio_ir_recv_pm_ops,
208 #endif
209 },
210 };
211 module_platform_driver(gpio_ir_recv_driver);
212
213 MODULE_DESCRIPTION("GPIO IR Receiver driver");
214 MODULE_LICENSE("GPL v2");
215