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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 <linux/platform_data/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 struct timer_list flush_timer;
34};
35
36#ifdef CONFIG_OF
37
38
39
40static int gpio_ir_recv_get_devtree_pdata(struct device *dev,
41 struct gpio_ir_recv_platform_data *pdata)
42{
43 struct device_node *np = dev->of_node;
44 enum of_gpio_flags flags;
45 int gpio;
46
47 gpio = of_get_gpio_flags(np, 0, &flags);
48 if (gpio < 0) {
49 if (gpio != -EPROBE_DEFER)
50 dev_err(dev, "Failed to get gpio flags (%d)\n", gpio);
51 return gpio;
52 }
53
54 pdata->gpio_nr = gpio;
55 pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW);
56
57 pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);
58 pdata->allowed_protos = 0;
59
60 return 0;
61}
62
63static const struct of_device_id gpio_ir_recv_of_match[] = {
64 { .compatible = "gpio-ir-receiver", },
65 { },
66};
67MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
68
69#else
70
71#define gpio_ir_recv_get_devtree_pdata(dev, pdata) (-ENOSYS)
72
73#endif
74
75static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
76{
77 struct gpio_rc_dev *gpio_dev = dev_id;
78 int gval;
79 int rc = 0;
80 enum raw_event_type type = IR_SPACE;
81
82 gval = gpio_get_value(gpio_dev->gpio_nr);
83
84 if (gval < 0)
85 goto err_get_value;
86
87 if (gpio_dev->active_low)
88 gval = !gval;
89
90 if (gval == 1)
91 type = IR_PULSE;
92
93 rc = ir_raw_event_store_edge(gpio_dev->rcdev, type);
94 if (rc < 0)
95 goto err_get_value;
96
97 mod_timer(&gpio_dev->flush_timer,
98 jiffies + nsecs_to_jiffies(gpio_dev->rcdev->timeout));
99
100 ir_raw_event_handle(gpio_dev->rcdev);
101
102err_get_value:
103 return IRQ_HANDLED;
104}
105
106static void flush_timer(unsigned long arg)
107{
108 struct gpio_rc_dev *gpio_dev = (struct gpio_rc_dev *)arg;
109 DEFINE_IR_RAW_EVENT(ev);
110
111 ev.timeout = true;
112 ev.duration = gpio_dev->rcdev->timeout;
113 ir_raw_event_store(gpio_dev->rcdev, &ev);
114 ir_raw_event_handle(gpio_dev->rcdev);
115}
116
117static int gpio_ir_recv_probe(struct platform_device *pdev)
118{
119 struct gpio_rc_dev *gpio_dev;
120 struct rc_dev *rcdev;
121 const struct gpio_ir_recv_platform_data *pdata =
122 pdev->dev.platform_data;
123 int rc;
124
125 if (pdev->dev.of_node) {
126 struct gpio_ir_recv_platform_data *dtpdata =
127 devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL);
128 if (!dtpdata)
129 return -ENOMEM;
130 rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata);
131 if (rc)
132 return rc;
133 pdata = dtpdata;
134 }
135
136 if (!pdata)
137 return -EINVAL;
138
139 if (pdata->gpio_nr < 0)
140 return -EINVAL;
141
142 gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL);
143 if (!gpio_dev)
144 return -ENOMEM;
145
146 rcdev = rc_allocate_device();
147 if (!rcdev) {
148 rc = -ENOMEM;
149 goto err_allocate_device;
150 }
151
152 rcdev->priv = gpio_dev;
153 rcdev->driver_type = RC_DRIVER_IR_RAW;
154 rcdev->input_name = GPIO_IR_DEVICE_NAME;
155 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
156 rcdev->input_id.bustype = BUS_HOST;
157 rcdev->input_id.vendor = 0x0001;
158 rcdev->input_id.product = 0x0001;
159 rcdev->input_id.version = 0x0100;
160 rcdev->dev.parent = &pdev->dev;
161 rcdev->driver_name = GPIO_IR_DRIVER_NAME;
162 rcdev->min_timeout = 0;
163 rcdev->timeout = IR_DEFAULT_TIMEOUT;
164 rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
165 if (pdata->allowed_protos)
166 rcdev->allowed_protocols = pdata->allowed_protos;
167 else
168 rcdev->allowed_protocols = RC_BIT_ALL;
169 rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY;
170
171 gpio_dev->rcdev = rcdev;
172 gpio_dev->gpio_nr = pdata->gpio_nr;
173 gpio_dev->active_low = pdata->active_low;
174
175 setup_timer(&gpio_dev->flush_timer, flush_timer,
176 (unsigned long)gpio_dev);
177
178 rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
179 if (rc < 0)
180 goto err_gpio_request;
181 rc = gpio_direction_input(pdata->gpio_nr);
182 if (rc < 0)
183 goto err_gpio_direction_input;
184
185 rc = rc_register_device(rcdev);
186 if (rc < 0) {
187 dev_err(&pdev->dev, "failed to register rc device\n");
188 goto err_register_rc_device;
189 }
190
191 platform_set_drvdata(pdev, gpio_dev);
192
193 rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr),
194 gpio_ir_recv_irq,
195 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
196 "gpio-ir-recv-irq", gpio_dev);
197 if (rc < 0)
198 goto err_request_irq;
199
200 return 0;
201
202err_request_irq:
203 rc_unregister_device(rcdev);
204 rcdev = NULL;
205err_register_rc_device:
206err_gpio_direction_input:
207 gpio_free(pdata->gpio_nr);
208err_gpio_request:
209 rc_free_device(rcdev);
210err_allocate_device:
211 kfree(gpio_dev);
212 return rc;
213}
214
215static int gpio_ir_recv_remove(struct platform_device *pdev)
216{
217 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
218
219 free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
220 del_timer_sync(&gpio_dev->flush_timer);
221 rc_unregister_device(gpio_dev->rcdev);
222 gpio_free(gpio_dev->gpio_nr);
223 kfree(gpio_dev);
224 return 0;
225}
226
227#ifdef CONFIG_PM
228static int gpio_ir_recv_suspend(struct device *dev)
229{
230 struct platform_device *pdev = to_platform_device(dev);
231 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
232
233 if (device_may_wakeup(dev))
234 enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
235 else
236 disable_irq(gpio_to_irq(gpio_dev->gpio_nr));
237
238 return 0;
239}
240
241static int gpio_ir_recv_resume(struct device *dev)
242{
243 struct platform_device *pdev = to_platform_device(dev);
244 struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
245
246 if (device_may_wakeup(dev))
247 disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
248 else
249 enable_irq(gpio_to_irq(gpio_dev->gpio_nr));
250
251 return 0;
252}
253
254static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
255 .suspend = gpio_ir_recv_suspend,
256 .resume = gpio_ir_recv_resume,
257};
258#endif
259
260static struct platform_driver gpio_ir_recv_driver = {
261 .probe = gpio_ir_recv_probe,
262 .remove = gpio_ir_recv_remove,
263 .driver = {
264 .name = GPIO_IR_DRIVER_NAME,
265 .of_match_table = of_match_ptr(gpio_ir_recv_of_match),
266#ifdef CONFIG_PM
267 .pm = &gpio_ir_recv_pm_ops,
268#endif
269 },
270};
271module_platform_driver(gpio_ir_recv_driver);
272
273MODULE_DESCRIPTION("GPIO IR Receiver driver");
274MODULE_LICENSE("GPL v2");
275
