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13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/interrupt.h>
17#include <linux/gpio.h>
18#include <linux/slab.h>
19#include <linux/of.h>
20#include <linux/of_gpio.h>
21#include <linux/platform_device.h>
22#include <linux/irq.h>
23#include <media/rc-core.h>
24#include <media/gpio-ir-recv.h>
25
26#define GPIO_IR_DRIVER_NAME "gpio-rc-recv"
27#define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
28
29struct gpio_rc_dev {
30 struct rc_dev *rcdev;
31 int gpio_nr;
32 bool active_low;
33};
34
35#ifdef CONFIG_OF
36
37
38
39static int gpio_ir_recv_get_devtree_pdata(struct device *dev,
40 struct gpio_ir_recv_platform_data *pdata)
41{
42 struct device_node *np = dev->of_node;
43 enum of_gpio_flags flags;
44 int gpio;
45
46 gpio = of_get_gpio_flags(np, 0, &flags);
47 if (gpio < 0) {
48 if (gpio != -EPROBE_DEFER)
49 dev_err(dev, "Failed to get gpio flags (%d)\n", gpio);
50 return gpio;
51 }
52
53 pdata->gpio_nr = gpio;
54 pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW);
55
56 pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);
57 pdata->allowed_protos = 0;
58
59 return 0;
60}
61
62static struct of_device_id gpio_ir_recv_of_match[] = {
63 { .compatible = "gpio-ir-receiver", },
64 { },
65};
66MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
67
68#else
69
70#define gpio_ir_recv_get_devtree_pdata(dev, pdata) (-ENOSYS)
71
72#endif
73
74static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
75{
76 struct gpio_rc_dev *gpio_dev = dev_id;
77 int gval;
78 int rc = 0;
79 enum raw_event_type type = IR_SPACE;
80
81 gval = gpio_get_value_cansleep(gpio_dev->gpio_nr);
82
83 if (gval < 0)
84 goto err_get_value;
85
86 if (gpio_dev->active_low)
87 gval = !gval;
88
89 if (gval == 1)
90 type = IR_PULSE;
91
92 rc = ir_raw_event_store_edge(gpio_dev->rcdev, type);
93 if (rc < 0)
94 goto err_get_value;
95
96 ir_raw_event_handle(gpio_dev->rcdev);
97
98err_get_value:
99 return IRQ_HANDLED;
100}
101
102static int gpio_ir_recv_probe(struct platform_device *pdev)
103{
104 struct gpio_rc_dev *gpio_dev;
105 struct rc_dev *rcdev;
106 const struct gpio_ir_recv_platform_data *pdata =
107 pdev->dev.platform_data;
108 int rc;
109
110 if (pdev->dev.of_node) {
111 struct gpio_ir_recv_platform_data *dtpdata =
112 devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL);
113 if (!dtpdata)
114 return -ENOMEM;
115 rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata);
116 if (rc)
117 return rc;
118 pdata = dtpdata;
119 }
120
121 if (!pdata)
122 return -EINVAL;
123
124 if (pdata->gpio_nr < 0)
125 return -EINVAL;
126
127 gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL);
128 if (!gpio_dev)
129 return -ENOMEM;
130
131 rcdev = rc_allocate_device();
132 if (!rcdev) {
133 rc = -ENOMEM;
134 goto err_allocate_device;
135 }
136
137 rcdev->priv = gpio_dev;
138 rcdev->driver_type = RC_DRIVER_IR_RAW;
139 rcdev->input_name = GPIO_IR_DEVICE_NAME;
140 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
141 rcdev->input_id.bustype = BUS_HOST;
142 rcdev->input_id.vendor = 0x0001;
143 rcdev->input_id.product = 0x0001;
144 rcdev->input_id.version = 0x0100;
145 rcdev->dev.parent = &pdev->dev;
146 rcdev->driver_name = GPIO_IR_DRIVER_NAME;
147 if (pdata->allowed_protos)
148 rcdev->allowed_protocols = pdata->allowed_protos;
149 else
150 rcdev->allowed_protocols = RC_BIT_ALL;
151 rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY;
152
153 gpio_dev->rcdev = rcdev;
154 gpio_dev->gpio_nr = pdata->gpio_nr;
155 gpio_dev->active_low = pdata->active_low;
156
157 rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
158 if (rc < 0)
159 goto err_gpio_request;
160 rc = gpio_direction_input(pdata->gpio_nr);
161 if (rc < 0)
162 goto err_gpio_direction_input;
163
164 rc = rc_register_device(rcdev);
165 if (rc < 0) {
166 dev_err(&pdev->dev, "failed to register rc device\n");
167 goto err_register_rc_device;
168 }
169
170 platform_set_drvdata(pdev, gpio_dev);
171
172 rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr),
173 gpio_ir_recv_irq,
174 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
175 "gpio-ir-recv-irq", gpio_dev);
176 if (rc < 0)
177 goto err_request_irq;
178
179 return 0;
180
181err_request_irq:
182 rc_unregister_device(rcdev);
183 rcdev = NULL;
184err_register_rc_device:
185err_gpio_direction_input:
186 gpio_free(pdata->gpio_nr);
187err_gpio_request:
188 rc_free_device(rcdev);
189err_allocate_device:
190 kfree(gpio_dev);
191 return rc;
192}
193
194static int gpio_ir_recv_remove(struct platform_device *pdev)
195{
196 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
197
198 free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
199 rc_unregister_device(gpio_dev->rcdev);
200 gpio_free(gpio_dev->gpio_nr);
201 kfree(gpio_dev);
202 return 0;
203}
204
205#ifdef CONFIG_PM
206static int gpio_ir_recv_suspend(struct device *dev)
207{
208 struct platform_device *pdev = to_platform_device(dev);
209 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
210
211 if (device_may_wakeup(dev))
212 enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
213 else
214 disable_irq(gpio_to_irq(gpio_dev->gpio_nr));
215
216 return 0;
217}
218
219static int gpio_ir_recv_resume(struct device *dev)
220{
221 struct platform_device *pdev = to_platform_device(dev);
222 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
223
224 if (device_may_wakeup(dev))
225 disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
226 else
227 enable_irq(gpio_to_irq(gpio_dev->gpio_nr));
228
229 return 0;
230}
231
232static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
233 .suspend = gpio_ir_recv_suspend,
234 .resume = gpio_ir_recv_resume,
235};
236#endif
237
238static struct platform_driver gpio_ir_recv_driver = {
239 .probe = gpio_ir_recv_probe,
240 .remove = gpio_ir_recv_remove,
241 .driver = {
242 .name = GPIO_IR_DRIVER_NAME,
243 .of_match_table = of_match_ptr(gpio_ir_recv_of_match),
244#ifdef CONFIG_PM
245 .pm = &gpio_ir_recv_pm_ops,
246#endif
247 },
248};
249module_platform_driver(gpio_ir_recv_driver);
250
251MODULE_DESCRIPTION("GPIO IR Receiver driver");
252MODULE_LICENSE("GPL v2");
253
