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/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>
18
19 #define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
20
21 struct gpio_rc_dev {
22 struct rc_dev *rcdev;
23 struct gpio_desc *gpiod;
24 int irq;
25 struct device *pmdev;
26 struct pm_qos_request qos;
27 };
28
gpio_ir_recv_irq(int irq,void * dev_id)29 static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
30 {
31 int val;
32 struct gpio_rc_dev *gpio_dev = dev_id;
33 struct device *pmdev = gpio_dev->pmdev;
34
35 /*
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.
41 *
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.
44 */
45 if (pmdev)
46 pm_runtime_get(pmdev);
47
48 val = gpiod_get_value(gpio_dev->gpiod);
49 if (val >= 0)
50 ir_raw_event_store_edge(gpio_dev->rcdev, val == 1);
51
52 if (pmdev) {
53 pm_runtime_mark_last_busy(pmdev);
54 pm_runtime_put_autosuspend(pmdev);
55 }
56
57 return IRQ_HANDLED;
58 }
59
gpio_ir_recv_probe(struct platform_device * pdev)60 static int gpio_ir_recv_probe(struct platform_device *pdev)
61 {
62 struct device *dev = &pdev->dev;
63 struct device_node *np = dev->of_node;
64 struct gpio_rc_dev *gpio_dev;
65 struct rc_dev *rcdev;
66 u32 period = 0;
67 int rc;
68
69 if (!np)
70 return -ENODEV;
71
72 gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL);
73 if (!gpio_dev)
74 return -ENOMEM;
75
76 gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
77 if (IS_ERR(gpio_dev->gpiod))
78 return dev_err_probe(dev, PTR_ERR(gpio_dev->gpiod),
79 "error getting gpio\n");
80 gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod);
81 if (gpio_dev->irq < 0)
82 return gpio_dev->irq;
83
84 rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
85 if (!rcdev)
86 return -ENOMEM;
87
88 rcdev->priv = gpio_dev;
89 rcdev->device_name = GPIO_IR_DEVICE_NAME;
90 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
91 rcdev->input_id.bustype = BUS_HOST;
92 rcdev->input_id.vendor = 0x0001;
93 rcdev->input_id.product = 0x0001;
94 rcdev->input_id.version = 0x0100;
95 rcdev->dev.parent = dev;
96 rcdev->driver_name = KBUILD_MODNAME;
97 rcdev->min_timeout = 1;
98 rcdev->timeout = IR_DEFAULT_TIMEOUT;
99 rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
100 rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
101 rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL);
102 if (!rcdev->map_name)
103 rcdev->map_name = RC_MAP_EMPTY;
104
105 gpio_dev->rcdev = rcdev;
106 if (of_property_read_bool(np, "wakeup-source"))
107 device_init_wakeup(dev, true);
108
109 rc = devm_rc_register_device(dev, rcdev);
110 if (rc < 0) {
111 dev_err(dev, "failed to register rc device (%d)\n", rc);
112 return rc;
113 }
114
115 of_property_read_u32(np, "linux,autosuspend-period", &period);
116 if (period) {
117 gpio_dev->pmdev = dev;
118 pm_runtime_set_autosuspend_delay(dev, period);
119 pm_runtime_use_autosuspend(dev);
120 pm_runtime_set_suspended(dev);
121 pm_runtime_enable(dev);
122 }
123
124 platform_set_drvdata(pdev, gpio_dev);
125
126 return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq,
127 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
128 "gpio-ir-recv-irq", gpio_dev);
129 }
130
gpio_ir_recv_remove(struct platform_device * pdev)131 static void gpio_ir_recv_remove(struct platform_device *pdev)
132 {
133 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
134 struct device *pmdev = gpio_dev->pmdev;
135
136 if (pmdev) {
137 pm_runtime_get_sync(pmdev);
138 cpu_latency_qos_remove_request(&gpio_dev->qos);
139
140 pm_runtime_disable(pmdev);
141 pm_runtime_put_noidle(pmdev);
142 pm_runtime_set_suspended(pmdev);
143 }
144 }
145
146 #ifdef CONFIG_PM
gpio_ir_recv_suspend(struct device * dev)147 static int gpio_ir_recv_suspend(struct device *dev)
148 {
149 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
150
151 if (device_may_wakeup(dev))
152 enable_irq_wake(gpio_dev->irq);
153 else
154 disable_irq(gpio_dev->irq);
155
156 return 0;
157 }
158
gpio_ir_recv_resume(struct device * dev)159 static int gpio_ir_recv_resume(struct device *dev)
160 {
161 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
162
163 if (device_may_wakeup(dev))
164 disable_irq_wake(gpio_dev->irq);
165 else
166 enable_irq(gpio_dev->irq);
167
168 return 0;
169 }
170
gpio_ir_recv_runtime_suspend(struct device * dev)171 static int gpio_ir_recv_runtime_suspend(struct device *dev)
172 {
173 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
174
175 cpu_latency_qos_remove_request(&gpio_dev->qos);
176
177 return 0;
178 }
179
gpio_ir_recv_runtime_resume(struct device * dev)180 static int gpio_ir_recv_runtime_resume(struct device *dev)
181 {
182 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
183
184 cpu_latency_qos_add_request(&gpio_dev->qos, 0);
185
186 return 0;
187 }
188
189 static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
190 .suspend = gpio_ir_recv_suspend,
191 .resume = gpio_ir_recv_resume,
192 .runtime_suspend = gpio_ir_recv_runtime_suspend,
193 .runtime_resume = gpio_ir_recv_runtime_resume,
194 };
195 #endif
196
197 static const struct of_device_id gpio_ir_recv_of_match[] = {
198 { .compatible = "gpio-ir-receiver", },
199 { },
200 };
201 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
202
203 static struct platform_driver gpio_ir_recv_driver = {
204 .probe = gpio_ir_recv_probe,
205 .remove_new = gpio_ir_recv_remove,
206 .driver = {
207 .name = KBUILD_MODNAME,
208 .of_match_table = gpio_ir_recv_of_match,
209 #ifdef CONFIG_PM
210 .pm = &gpio_ir_recv_pm_ops,
211 #endif
212 },
213 };
214 module_platform_driver(gpio_ir_recv_driver);
215
216 MODULE_DESCRIPTION("GPIO IR Receiver driver");
217 MODULE_LICENSE("GPL v2");
218