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