1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26#include <linux/device.h>
27#include <linux/module.h>
28#include <linux/sched.h>
29#include <media/rc-core.h>
30
31#define DRIVER_NAME "rc-loopback"
32#define dprintk(x...) if (debug) printk(KERN_INFO DRIVER_NAME ": " x)
33#define RXMASK_REGULAR 0x1
34#define RXMASK_LEARNING 0x2
35
36static bool debug;
37
38struct loopback_dev {
39 struct rc_dev *dev;
40 u32 txmask;
41 u32 txcarrier;
42 u32 txduty;
43 bool idle;
44 bool learning;
45 bool carrierreport;
46 u32 rxcarriermin;
47 u32 rxcarriermax;
48};
49
50static struct loopback_dev loopdev;
51
52static int loop_set_tx_mask(struct rc_dev *dev, u32 mask)
53{
54 struct loopback_dev *lodev = dev->priv;
55
56 if ((mask & (RXMASK_REGULAR | RXMASK_LEARNING)) != mask) {
57 dprintk("invalid tx mask: %u\n", mask);
58 return -EINVAL;
59 }
60
61 dprintk("setting tx mask: %u\n", mask);
62 lodev->txmask = mask;
63 return 0;
64}
65
66static int loop_set_tx_carrier(struct rc_dev *dev, u32 carrier)
67{
68 struct loopback_dev *lodev = dev->priv;
69
70 dprintk("setting tx carrier: %u\n", carrier);
71 lodev->txcarrier = carrier;
72 return 0;
73}
74
75static int loop_set_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
76{
77 struct loopback_dev *lodev = dev->priv;
78
79 if (duty_cycle < 1 || duty_cycle > 99) {
80 dprintk("invalid duty cycle: %u\n", duty_cycle);
81 return -EINVAL;
82 }
83
84 dprintk("setting duty cycle: %u\n", duty_cycle);
85 lodev->txduty = duty_cycle;
86 return 0;
87}
88
89static int loop_set_rx_carrier_range(struct rc_dev *dev, u32 min, u32 max)
90{
91 struct loopback_dev *lodev = dev->priv;
92
93 if (min < 1 || min > max) {
94 dprintk("invalid rx carrier range %u to %u\n", min, max);
95 return -EINVAL;
96 }
97
98 dprintk("setting rx carrier range %u to %u\n", min, max);
99 lodev->rxcarriermin = min;
100 lodev->rxcarriermax = max;
101 return 0;
102}
103
104static int loop_tx_ir(struct rc_dev *dev, unsigned *txbuf, unsigned count)
105{
106 struct loopback_dev *lodev = dev->priv;
107 u32 rxmask;
108 unsigned total_duration = 0;
109 unsigned i;
110 DEFINE_IR_RAW_EVENT(rawir);
111
112 for (i = 0; i < count; i++)
113 total_duration += abs(txbuf[i]);
114
115 if (total_duration == 0) {
116 dprintk("invalid tx data, total duration zero\n");
117 return -EINVAL;
118 }
119
120 if (lodev->txcarrier < lodev->rxcarriermin ||
121 lodev->txcarrier > lodev->rxcarriermax) {
122 dprintk("ignoring tx, carrier out of range\n");
123 goto out;
124 }
125
126 if (lodev->learning)
127 rxmask = RXMASK_LEARNING;
128 else
129 rxmask = RXMASK_REGULAR;
130
131 if (!(rxmask & lodev->txmask)) {
132 dprintk("ignoring tx, rx mask mismatch\n");
133 goto out;
134 }
135
136 for (i = 0; i < count; i++) {
137 rawir.pulse = i % 2 ? false : true;
138 rawir.duration = txbuf[i] * 1000;
139 if (rawir.duration)
140 ir_raw_event_store_with_filter(dev, &rawir);
141 }
142
143
144 rawir.pulse = false;
145 rawir.duration = dev->timeout;
146 ir_raw_event_store_with_filter(dev, &rawir);
147
148 ir_raw_event_handle(dev);
149
150out:
151
152 set_current_state(TASK_INTERRUPTIBLE);
153 schedule_timeout(usecs_to_jiffies(total_duration));
154 return count;
155}
156
157static void loop_set_idle(struct rc_dev *dev, bool enable)
158{
159 struct loopback_dev *lodev = dev->priv;
160
161 if (lodev->idle != enable) {
162 dprintk("%sing idle mode\n", enable ? "enter" : "exit");
163 lodev->idle = enable;
164 }
165}
166
167static int loop_set_learning_mode(struct rc_dev *dev, int enable)
168{
169 struct loopback_dev *lodev = dev->priv;
170
171 if (lodev->learning != enable) {
172 dprintk("%sing learning mode\n", enable ? "enter" : "exit");
173 lodev->learning = !!enable;
174 }
175
176 return 0;
177}
178
179static int loop_set_carrier_report(struct rc_dev *dev, int enable)
180{
181 struct loopback_dev *lodev = dev->priv;
182
183 if (lodev->carrierreport != enable) {
184 dprintk("%sabling carrier reports\n", enable ? "en" : "dis");
185 lodev->carrierreport = !!enable;
186 }
187
188 return 0;
189}
190
191static int __init loop_init(void)
192{
193 struct rc_dev *rc;
194 int ret;
195
196 rc = rc_allocate_device();
197 if (!rc) {
198 printk(KERN_ERR DRIVER_NAME ": rc_dev allocation failed\n");
199 return -ENOMEM;
200 }
201
202 rc->input_name = "rc-core loopback device";
203 rc->input_phys = "rc-core/virtual";
204 rc->input_id.bustype = BUS_VIRTUAL;
205 rc->input_id.version = 1;
206 rc->driver_name = DRIVER_NAME;
207 rc->map_name = RC_MAP_EMPTY;
208 rc->priv = &loopdev;
209 rc->driver_type = RC_DRIVER_IR_RAW;
210 rc->allowed_protos = RC_TYPE_ALL;
211 rc->timeout = 100 * 1000 * 1000;
212 rc->min_timeout = 1;
213 rc->max_timeout = UINT_MAX;
214 rc->rx_resolution = 1000;
215 rc->tx_resolution = 1000;
216 rc->s_tx_mask = loop_set_tx_mask;
217 rc->s_tx_carrier = loop_set_tx_carrier;
218 rc->s_tx_duty_cycle = loop_set_tx_duty_cycle;
219 rc->s_rx_carrier_range = loop_set_rx_carrier_range;
220 rc->tx_ir = loop_tx_ir;
221 rc->s_idle = loop_set_idle;
222 rc->s_learning_mode = loop_set_learning_mode;
223 rc->s_carrier_report = loop_set_carrier_report;
224 rc->priv = &loopdev;
225
226 loopdev.txmask = RXMASK_REGULAR;
227 loopdev.txcarrier = 36000;
228 loopdev.txduty = 50;
229 loopdev.rxcarriermin = 1;
230 loopdev.rxcarriermax = ~0;
231 loopdev.idle = true;
232 loopdev.learning = false;
233 loopdev.carrierreport = false;
234
235 ret = rc_register_device(rc);
236 if (ret < 0) {
237 printk(KERN_ERR DRIVER_NAME ": rc_dev registration failed\n");
238 rc_free_device(rc);
239 return ret;
240 }
241
242 loopdev.dev = rc;
243 return 0;
244}
245
246static void __exit loop_exit(void)
247{
248 rc_unregister_device(loopdev.dev);
249}
250
251module_init(loop_init);
252module_exit(loop_exit);
253
254module_param(debug, bool, S_IRUGO | S_IWUSR);
255MODULE_PARM_DESC(debug, "Enable debug messages");
256
257MODULE_DESCRIPTION("Loopback device for rc-core debugging");
258MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
259MODULE_LICENSE("GPL");
260
