2 * Loopback driver for rc-core,
4 * Copyright (c) 2010 David Härdeman <david@hardeman.nu>
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.
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.
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.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <linux/device.h>
27 #include <linux/module.h>
28 #include <linux/sched.h>
29 #include <linux/slab.h>
30 #include <media/rc-core.h>
32 #define DRIVER_NAME "rc-loopback"
33 #define dprintk(x...) if (debug) printk(KERN_INFO DRIVER_NAME ": " x)
34 #define RXMASK_REGULAR 0x1
35 #define RXMASK_LEARNING 0x2
51 static struct loopback_dev loopdev
;
53 static int loop_set_tx_mask(struct rc_dev
*dev
, u32 mask
)
55 struct loopback_dev
*lodev
= dev
->priv
;
57 if ((mask
& (RXMASK_REGULAR
| RXMASK_LEARNING
)) != mask
) {
58 dprintk("invalid tx mask: %u\n", mask
);
62 dprintk("setting tx mask: %u\n", mask
);
67 static int loop_set_tx_carrier(struct rc_dev
*dev
, u32 carrier
)
69 struct loopback_dev
*lodev
= dev
->priv
;
71 dprintk("setting tx carrier: %u\n", carrier
);
72 lodev
->txcarrier
= carrier
;
76 static int loop_set_tx_duty_cycle(struct rc_dev
*dev
, u32 duty_cycle
)
78 struct loopback_dev
*lodev
= dev
->priv
;
80 if (duty_cycle
< 1 || duty_cycle
> 99) {
81 dprintk("invalid duty cycle: %u\n", duty_cycle
);
85 dprintk("setting duty cycle: %u\n", duty_cycle
);
86 lodev
->txduty
= duty_cycle
;
90 static int loop_set_rx_carrier_range(struct rc_dev
*dev
, u32 min
, u32 max
)
92 struct loopback_dev
*lodev
= dev
->priv
;
94 if (min
< 1 || min
> max
) {
95 dprintk("invalid rx carrier range %u to %u\n", min
, max
);
99 dprintk("setting rx carrier range %u to %u\n", min
, max
);
100 lodev
->rxcarriermin
= min
;
101 lodev
->rxcarriermax
= max
;
105 static int loop_tx_ir(struct rc_dev
*dev
, unsigned *txbuf
, unsigned count
)
107 struct loopback_dev
*lodev
= dev
->priv
;
110 DEFINE_IR_RAW_EVENT(rawir
);
112 if (lodev
->txcarrier
< lodev
->rxcarriermin
||
113 lodev
->txcarrier
> lodev
->rxcarriermax
) {
114 dprintk("ignoring tx, carrier out of range\n");
119 rxmask
= RXMASK_LEARNING
;
121 rxmask
= RXMASK_REGULAR
;
123 if (!(rxmask
& lodev
->txmask
)) {
124 dprintk("ignoring tx, rx mask mismatch\n");
128 for (i
= 0; i
< count
; i
++) {
129 rawir
.pulse
= i
% 2 ? false : true;
130 rawir
.duration
= txbuf
[i
] * 1000;
132 ir_raw_event_store_with_filter(dev
, &rawir
);
135 /* Fake a silence long enough to cause us to go idle */
137 rawir
.duration
= dev
->timeout
;
138 ir_raw_event_store_with_filter(dev
, &rawir
);
140 ir_raw_event_handle(dev
);
146 static void loop_set_idle(struct rc_dev
*dev
, bool enable
)
148 struct loopback_dev
*lodev
= dev
->priv
;
150 if (lodev
->idle
!= enable
) {
151 dprintk("%sing idle mode\n", enable
? "enter" : "exit");
152 lodev
->idle
= enable
;
156 static int loop_set_learning_mode(struct rc_dev
*dev
, int enable
)
158 struct loopback_dev
*lodev
= dev
->priv
;
160 if (lodev
->learning
!= enable
) {
161 dprintk("%sing learning mode\n", enable
? "enter" : "exit");
162 lodev
->learning
= !!enable
;
168 static int loop_set_carrier_report(struct rc_dev
*dev
, int enable
)
170 struct loopback_dev
*lodev
= dev
->priv
;
172 if (lodev
->carrierreport
!= enable
) {
173 dprintk("%sabling carrier reports\n", enable
? "en" : "dis");
174 lodev
->carrierreport
= !!enable
;
180 static int loop_set_wakeup_filter(struct rc_dev
*dev
,
181 struct rc_scancode_filter
*sc_filter
)
183 static const unsigned int max
= 512;
184 struct ir_raw_event
*raw
;
188 /* fine to disable filter */
189 if (!sc_filter
->mask
)
192 /* encode the specified filter and loop it back */
193 raw
= kmalloc_array(max
, sizeof(*raw
), GFP_KERNEL
);
194 ret
= ir_raw_encode_scancode(dev
->enabled_wakeup_protocols
, sc_filter
,
196 /* still loop back the partial raw IR even if it's incomplete */
200 /* do the loopback */
201 for (i
= 0; i
< ret
; ++i
)
202 ir_raw_event_store(dev
, &raw
[i
]);
203 ir_raw_event_handle(dev
);
213 static int __init
loop_init(void)
218 rc
= rc_allocate_device();
220 printk(KERN_ERR DRIVER_NAME
": rc_dev allocation failed\n");
224 rc
->input_name
= "rc-core loopback device";
225 rc
->input_phys
= "rc-core/virtual";
226 rc
->input_id
.bustype
= BUS_VIRTUAL
;
227 rc
->input_id
.version
= 1;
228 rc
->driver_name
= DRIVER_NAME
;
229 rc
->map_name
= RC_MAP_EMPTY
;
231 rc
->driver_type
= RC_DRIVER_IR_RAW
;
232 rc
->encode_wakeup
= true;
233 rc
->allowed_protocols
= RC_BIT_ALL
;
234 rc
->timeout
= 100 * 1000 * 1000; /* 100 ms */
236 rc
->max_timeout
= UINT_MAX
;
237 rc
->rx_resolution
= 1000;
238 rc
->tx_resolution
= 1000;
239 rc
->s_tx_mask
= loop_set_tx_mask
;
240 rc
->s_tx_carrier
= loop_set_tx_carrier
;
241 rc
->s_tx_duty_cycle
= loop_set_tx_duty_cycle
;
242 rc
->s_rx_carrier_range
= loop_set_rx_carrier_range
;
243 rc
->tx_ir
= loop_tx_ir
;
244 rc
->s_idle
= loop_set_idle
;
245 rc
->s_learning_mode
= loop_set_learning_mode
;
246 rc
->s_carrier_report
= loop_set_carrier_report
;
247 rc
->s_wakeup_filter
= loop_set_wakeup_filter
;
249 loopdev
.txmask
= RXMASK_REGULAR
;
250 loopdev
.txcarrier
= 36000;
252 loopdev
.rxcarriermin
= 1;
253 loopdev
.rxcarriermax
= ~0;
255 loopdev
.learning
= false;
256 loopdev
.carrierreport
= false;
258 ret
= rc_register_device(rc
);
260 printk(KERN_ERR DRIVER_NAME
": rc_dev registration failed\n");
269 static void __exit
loop_exit(void)
271 rc_unregister_device(loopdev
.dev
);
274 module_init(loop_init
);
275 module_exit(loop_exit
);
277 module_param(debug
, bool, S_IRUGO
| S_IWUSR
);
278 MODULE_PARM_DESC(debug
, "Enable debug messages");
280 MODULE_DESCRIPTION("Loopback device for rc-core debugging");
281 MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
282 MODULE_LICENSE("GPL");