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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Loopback driver for rc-core,
4 *
5 * Copyright (c) 2010 David Härdeman <david@hardeman.nu>
6 *
7 * This driver receives TX data and passes it back as RX data,
8 * which is useful for (scripted) debugging of rc-core without
9 * having to use actual hardware.
10 */
11
12#include <linux/device.h>
13#include <linux/module.h>
14#include <linux/sched.h>
15#include <linux/slab.h>
16#include <media/rc-core.h>
17
18#define DRIVER_NAME "rc-loopback"
19#define RXMASK_NARROWBAND 0x1
20#define RXMASK_WIDEBAND 0x2
21
22struct loopback_dev {
23 struct rc_dev *dev;
24 u32 txmask;
25 u32 txcarrier;
26 u32 txduty;
27 bool idle;
28 bool wideband;
29 bool carrierreport;
30 u32 rxcarriermin;
31 u32 rxcarriermax;
32};
33
34static struct loopback_dev loopdev;
35
36static int loop_set_tx_mask(struct rc_dev *dev, u32 mask)
37{
38 struct loopback_dev *lodev = dev->priv;
39
40 if ((mask & (RXMASK_NARROWBAND | RXMASK_WIDEBAND)) != mask) {
41 dev_dbg(&dev->dev, "invalid tx mask: %u\n", mask);
42 return 2;
43 }
44
45 dev_dbg(&dev->dev, "setting tx mask: %u\n", mask);
46 lodev->txmask = mask;
47 return 0;
48}
49
50static int loop_set_tx_carrier(struct rc_dev *dev, u32 carrier)
51{
52 struct loopback_dev *lodev = dev->priv;
53
54 dev_dbg(&dev->dev, "setting tx carrier: %u\n", carrier);
55 lodev->txcarrier = carrier;
56 return 0;
57}
58
59static int loop_set_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
60{
61 struct loopback_dev *lodev = dev->priv;
62
63 if (duty_cycle < 1 || duty_cycle > 99) {
64 dev_dbg(&dev->dev, "invalid duty cycle: %u\n", duty_cycle);
65 return -EINVAL;
66 }
67
68 dev_dbg(&dev->dev, "setting duty cycle: %u\n", duty_cycle);
69 lodev->txduty = duty_cycle;
70 return 0;
71}
72
73static int loop_set_rx_carrier_range(struct rc_dev *dev, u32 min, u32 max)
74{
75 struct loopback_dev *lodev = dev->priv;
76
77 if (min < 1 || min > max) {
78 dev_dbg(&dev->dev, "invalid rx carrier range %u to %u\n", min, max);
79 return -EINVAL;
80 }
81
82 dev_dbg(&dev->dev, "setting rx carrier range %u to %u\n", min, max);
83 lodev->rxcarriermin = min;
84 lodev->rxcarriermax = max;
85 return 0;
86}
87
88static int loop_tx_ir(struct rc_dev *dev, unsigned *txbuf, unsigned count)
89{
90 struct loopback_dev *lodev = dev->priv;
91 u32 rxmask;
92 unsigned i;
93 struct ir_raw_event rawir = {};
94
95 if (lodev->txcarrier < lodev->rxcarriermin ||
96 lodev->txcarrier > lodev->rxcarriermax) {
97 dev_dbg(&dev->dev, "ignoring tx, carrier out of range\n");
98 goto out;
99 }
100
101 if (lodev->wideband)
102 rxmask = RXMASK_WIDEBAND;
103 else
104 rxmask = RXMASK_NARROWBAND;
105
106 if (!(rxmask & lodev->txmask)) {
107 dev_dbg(&dev->dev, "ignoring tx, rx mask mismatch\n");
108 goto out;
109 }
110
111 for (i = 0; i < count; i++) {
112 rawir.pulse = i % 2 ? false : true;
113 rawir.duration = txbuf[i];
114
115 /* simulate overflow if ridiculously long pulse was sent */
116 if (rawir.pulse && rawir.duration > MS_TO_US(50))
117 ir_raw_event_overflow(dev);
118 else
119 ir_raw_event_store_with_filter(dev, &rawir);
120 }
121
122 if (lodev->carrierreport) {
123 rawir.pulse = false;
124 rawir.carrier_report = true;
125 rawir.carrier = lodev->txcarrier;
126
127 ir_raw_event_store(dev, &rawir);
128 }
129
130 /* Fake a silence long enough to cause us to go idle */
131 rawir.pulse = false;
132 rawir.duration = dev->timeout;
133 ir_raw_event_store_with_filter(dev, &rawir);
134
135 ir_raw_event_handle(dev);
136
137out:
138 return count;
139}
140
141static void loop_set_idle(struct rc_dev *dev, bool enable)
142{
143 struct loopback_dev *lodev = dev->priv;
144
145 if (lodev->idle != enable) {
146 dev_dbg(&dev->dev, "%sing idle mode\n", enable ? "enter" : "exit");
147 lodev->idle = enable;
148 }
149}
150
151static int loop_set_wideband_receiver(struct rc_dev *dev, int enable)
152{
153 struct loopback_dev *lodev = dev->priv;
154
155 if (lodev->wideband != enable) {
156 dev_dbg(&dev->dev, "using %sband receiver\n", enable ? "wide" : "narrow");
157 lodev->wideband = !!enable;
158 }
159
160 return 0;
161}
162
163static int loop_set_carrier_report(struct rc_dev *dev, int enable)
164{
165 struct loopback_dev *lodev = dev->priv;
166
167 if (lodev->carrierreport != enable) {
168 dev_dbg(&dev->dev, "%sabling carrier reports\n", enable ? "en" : "dis");
169 lodev->carrierreport = !!enable;
170 }
171
172 return 0;
173}
174
175static int loop_set_wakeup_filter(struct rc_dev *dev,
176 struct rc_scancode_filter *sc)
177{
178 static const unsigned int max = 512;
179 struct ir_raw_event *raw;
180 int ret;
181 int i;
182
183 /* fine to disable filter */
184 if (!sc->mask)
185 return 0;
186
187 /* encode the specified filter and loop it back */
188 raw = kmalloc_array(max, sizeof(*raw), GFP_KERNEL);
189 if (!raw)
190 return -ENOMEM;
191
192 ret = ir_raw_encode_scancode(dev->wakeup_protocol, sc->data, raw, max);
193 /* still loop back the partial raw IR even if it's incomplete */
194 if (ret == -ENOBUFS)
195 ret = max;
196 if (ret >= 0) {
197 /* do the loopback */
198 for (i = 0; i < ret; ++i)
199 ir_raw_event_store(dev, &raw[i]);
200 ir_raw_event_handle(dev);
201
202 ret = 0;
203 }
204
205 kfree(raw);
206
207 return ret;
208}
209
210static int __init loop_init(void)
211{
212 struct rc_dev *rc;
213 int ret;
214
215 rc = rc_allocate_device(RC_DRIVER_IR_RAW);
216 if (!rc)
217 return -ENOMEM;
218
219 rc->device_name = "rc-core loopback device";
220 rc->input_phys = "rc-core/virtual";
221 rc->input_id.bustype = BUS_VIRTUAL;
222 rc->input_id.version = 1;
223 rc->driver_name = DRIVER_NAME;
224 rc->map_name = RC_MAP_EMPTY;
225 rc->priv = &loopdev;
226 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
227 rc->allowed_wakeup_protocols = RC_PROTO_BIT_ALL_IR_ENCODER;
228 rc->encode_wakeup = true;
229 rc->timeout = IR_DEFAULT_TIMEOUT;
230 rc->min_timeout = 1;
231 rc->max_timeout = IR_MAX_TIMEOUT;
232 rc->rx_resolution = 1;
233 rc->tx_resolution = 1;
234 rc->s_tx_mask = loop_set_tx_mask;
235 rc->s_tx_carrier = loop_set_tx_carrier;
236 rc->s_tx_duty_cycle = loop_set_tx_duty_cycle;
237 rc->s_rx_carrier_range = loop_set_rx_carrier_range;
238 rc->tx_ir = loop_tx_ir;
239 rc->s_idle = loop_set_idle;
240 rc->s_wideband_receiver = loop_set_wideband_receiver;
241 rc->s_carrier_report = loop_set_carrier_report;
242 rc->s_wakeup_filter = loop_set_wakeup_filter;
243
244 loopdev.txmask = RXMASK_NARROWBAND;
245 loopdev.txcarrier = 36000;
246 loopdev.txduty = 50;
247 loopdev.rxcarriermin = 1;
248 loopdev.rxcarriermax = ~0;
249 loopdev.idle = true;
250 loopdev.wideband = false;
251 loopdev.carrierreport = false;
252
253 ret = rc_register_device(rc);
254 if (ret < 0) {
255 dev_err(&rc->dev, "rc_dev registration failed\n");
256 rc_free_device(rc);
257 return ret;
258 }
259
260 loopdev.dev = rc;
261 return 0;
262}
263
264static void __exit loop_exit(void)
265{
266 rc_unregister_device(loopdev.dev);
267}
268
269module_init(loop_init);
270module_exit(loop_exit);
271
272MODULE_DESCRIPTION("Loopback device for rc-core debugging");
273MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
274MODULE_LICENSE("GPL");
1/*
2 * Loopback driver for rc-core,
3 *
4 * Copyright (c) 2010 David Härdeman <david@hardeman.nu>
5 *
6 * This driver receives TX data and passes it back as RX data,
7 * which is useful for (scripted) debugging of rc-core without
8 * having to use actual hardware.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 */
21
22#include <linux/device.h>
23#include <linux/module.h>
24#include <linux/sched.h>
25#include <linux/slab.h>
26#include <media/rc-core.h>
27
28#define DRIVER_NAME "rc-loopback"
29#define dprintk(x...) if (debug) printk(KERN_INFO DRIVER_NAME ": " x)
30#define RXMASK_REGULAR 0x1
31#define RXMASK_LEARNING 0x2
32
33static bool debug;
34
35struct loopback_dev {
36 struct rc_dev *dev;
37 u32 txmask;
38 u32 txcarrier;
39 u32 txduty;
40 bool idle;
41 bool learning;
42 bool carrierreport;
43 u32 rxcarriermin;
44 u32 rxcarriermax;
45};
46
47static struct loopback_dev loopdev;
48
49static int loop_set_tx_mask(struct rc_dev *dev, u32 mask)
50{
51 struct loopback_dev *lodev = dev->priv;
52
53 if ((mask & (RXMASK_REGULAR | RXMASK_LEARNING)) != mask) {
54 dprintk("invalid tx mask: %u\n", mask);
55 return -EINVAL;
56 }
57
58 dprintk("setting tx mask: %u\n", mask);
59 lodev->txmask = mask;
60 return 0;
61}
62
63static int loop_set_tx_carrier(struct rc_dev *dev, u32 carrier)
64{
65 struct loopback_dev *lodev = dev->priv;
66
67 dprintk("setting tx carrier: %u\n", carrier);
68 lodev->txcarrier = carrier;
69 return 0;
70}
71
72static int loop_set_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
73{
74 struct loopback_dev *lodev = dev->priv;
75
76 if (duty_cycle < 1 || duty_cycle > 99) {
77 dprintk("invalid duty cycle: %u\n", duty_cycle);
78 return -EINVAL;
79 }
80
81 dprintk("setting duty cycle: %u\n", duty_cycle);
82 lodev->txduty = duty_cycle;
83 return 0;
84}
85
86static int loop_set_rx_carrier_range(struct rc_dev *dev, u32 min, u32 max)
87{
88 struct loopback_dev *lodev = dev->priv;
89
90 if (min < 1 || min > max) {
91 dprintk("invalid rx carrier range %u to %u\n", min, max);
92 return -EINVAL;
93 }
94
95 dprintk("setting rx carrier range %u to %u\n", min, max);
96 lodev->rxcarriermin = min;
97 lodev->rxcarriermax = max;
98 return 0;
99}
100
101static int loop_tx_ir(struct rc_dev *dev, unsigned *txbuf, unsigned count)
102{
103 struct loopback_dev *lodev = dev->priv;
104 u32 rxmask;
105 unsigned i;
106 DEFINE_IR_RAW_EVENT(rawir);
107
108 if (lodev->txcarrier < lodev->rxcarriermin ||
109 lodev->txcarrier > lodev->rxcarriermax) {
110 dprintk("ignoring tx, carrier out of range\n");
111 goto out;
112 }
113
114 if (lodev->learning)
115 rxmask = RXMASK_LEARNING;
116 else
117 rxmask = RXMASK_REGULAR;
118
119 if (!(rxmask & lodev->txmask)) {
120 dprintk("ignoring tx, rx mask mismatch\n");
121 goto out;
122 }
123
124 for (i = 0; i < count; i++) {
125 rawir.pulse = i % 2 ? false : true;
126 rawir.duration = txbuf[i] * 1000;
127 if (rawir.duration)
128 ir_raw_event_store_with_filter(dev, &rawir);
129 }
130
131 /* Fake a silence long enough to cause us to go idle */
132 rawir.pulse = false;
133 rawir.duration = dev->timeout;
134 ir_raw_event_store_with_filter(dev, &rawir);
135
136 ir_raw_event_handle(dev);
137
138out:
139 return count;
140}
141
142static void loop_set_idle(struct rc_dev *dev, bool enable)
143{
144 struct loopback_dev *lodev = dev->priv;
145
146 if (lodev->idle != enable) {
147 dprintk("%sing idle mode\n", enable ? "enter" : "exit");
148 lodev->idle = enable;
149 }
150}
151
152static int loop_set_learning_mode(struct rc_dev *dev, int enable)
153{
154 struct loopback_dev *lodev = dev->priv;
155
156 if (lodev->learning != enable) {
157 dprintk("%sing learning mode\n", enable ? "enter" : "exit");
158 lodev->learning = !!enable;
159 }
160
161 return 0;
162}
163
164static int loop_set_carrier_report(struct rc_dev *dev, int enable)
165{
166 struct loopback_dev *lodev = dev->priv;
167
168 if (lodev->carrierreport != enable) {
169 dprintk("%sabling carrier reports\n", enable ? "en" : "dis");
170 lodev->carrierreport = !!enable;
171 }
172
173 return 0;
174}
175
176static int loop_set_wakeup_filter(struct rc_dev *dev,
177 struct rc_scancode_filter *sc)
178{
179 static const unsigned int max = 512;
180 struct ir_raw_event *raw;
181 int ret;
182 int i;
183
184 /* fine to disable filter */
185 if (!sc->mask)
186 return 0;
187
188 /* encode the specified filter and loop it back */
189 raw = kmalloc_array(max, sizeof(*raw), GFP_KERNEL);
190 if (!raw)
191 return -ENOMEM;
192
193 ret = ir_raw_encode_scancode(dev->wakeup_protocol, sc->data, raw, max);
194 /* still loop back the partial raw IR even if it's incomplete */
195 if (ret == -ENOBUFS)
196 ret = max;
197 if (ret >= 0) {
198 /* do the loopback */
199 for (i = 0; i < ret; ++i)
200 ir_raw_event_store(dev, &raw[i]);
201 ir_raw_event_handle(dev);
202
203 ret = 0;
204 }
205
206 kfree(raw);
207
208 return ret;
209}
210
211static int __init loop_init(void)
212{
213 struct rc_dev *rc;
214 int ret;
215
216 rc = rc_allocate_device(RC_DRIVER_IR_RAW);
217 if (!rc) {
218 printk(KERN_ERR DRIVER_NAME ": rc_dev allocation failed\n");
219 return -ENOMEM;
220 }
221
222 rc->device_name = "rc-core loopback device";
223 rc->input_phys = "rc-core/virtual";
224 rc->input_id.bustype = BUS_VIRTUAL;
225 rc->input_id.version = 1;
226 rc->driver_name = DRIVER_NAME;
227 rc->map_name = RC_MAP_EMPTY;
228 rc->priv = &loopdev;
229 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
230 rc->allowed_wakeup_protocols = RC_PROTO_BIT_ALL_IR_ENCODER;
231 rc->encode_wakeup = true;
232 rc->timeout = 100 * 1000 * 1000; /* 100 ms */
233 rc->min_timeout = 1;
234 rc->max_timeout = UINT_MAX;
235 rc->rx_resolution = 1000;
236 rc->tx_resolution = 1000;
237 rc->s_tx_mask = loop_set_tx_mask;
238 rc->s_tx_carrier = loop_set_tx_carrier;
239 rc->s_tx_duty_cycle = loop_set_tx_duty_cycle;
240 rc->s_rx_carrier_range = loop_set_rx_carrier_range;
241 rc->tx_ir = loop_tx_ir;
242 rc->s_idle = loop_set_idle;
243 rc->s_learning_mode = loop_set_learning_mode;
244 rc->s_carrier_report = loop_set_carrier_report;
245 rc->s_wakeup_filter = loop_set_wakeup_filter;
246
247 loopdev.txmask = RXMASK_REGULAR;
248 loopdev.txcarrier = 36000;
249 loopdev.txduty = 50;
250 loopdev.rxcarriermin = 1;
251 loopdev.rxcarriermax = ~0;
252 loopdev.idle = true;
253 loopdev.learning = false;
254 loopdev.carrierreport = false;
255
256 ret = rc_register_device(rc);
257 if (ret < 0) {
258 printk(KERN_ERR DRIVER_NAME ": rc_dev registration failed\n");
259 rc_free_device(rc);
260 return ret;
261 }
262
263 loopdev.dev = rc;
264 return 0;
265}
266
267static void __exit loop_exit(void)
268{
269 rc_unregister_device(loopdev.dev);
270}
271
272module_init(loop_init);
273module_exit(loop_exit);
274
275module_param(debug, bool, S_IRUGO | S_IWUSR);
276MODULE_PARM_DESC(debug, "Enable debug messages");
277
278MODULE_DESCRIPTION("Loopback device for rc-core debugging");
279MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
280MODULE_LICENSE("GPL");