1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Loopback driver for rc-core,
8  * which is useful for (scripted) debugging of rc-core without
16 #include <media/rc-core.h>
18 #define DRIVER_NAME	"rc-loopback"
23 static bool debug;
37 static struct loopback_dev loopdev;
39 static int loop_set_tx_mask(struct rc_dev *dev, u32 mask)  in loop_set_tx_mask()
41 	struct loopback_dev *lodev = dev->priv;  in loop_set_tx_mask()
45 		return -EINVAL;  in loop_set_tx_mask()
49 	lodev->txmask = mask;  in loop_set_tx_mask()
53 static int loop_set_tx_carrier(struct rc_dev *dev, u32 carrier)  in loop_set_tx_carrier()
55 	struct loopback_dev *lodev = dev->priv;  in loop_set_tx_carrier()
58 	lodev->txcarrier = carrier;  in loop_set_tx_carrier()
62 static int loop_set_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)  in loop_set_tx_duty_cycle()
64 	struct loopback_dev *lodev = dev->priv;  in loop_set_tx_duty_cycle()
68 		return -EINVAL;  in loop_set_tx_duty_cycle()
72 	lodev->txduty = duty_cycle;  in loop_set_tx_duty_cycle()
76 static int loop_set_rx_carrier_range(struct rc_dev *dev, u32 min, u32 max)  in loop_set_rx_carrier_range()
78 	struct loopback_dev *lodev = dev->priv;  in loop_set_rx_carrier_range()
82 		return -EINVAL;  in loop_set_rx_carrier_range()
86 	lodev->rxcarriermin = min;  in loop_set_rx_carrier_range()
87 	lodev->rxcarriermax = max;  in loop_set_rx_carrier_range()
91 static int loop_tx_ir(struct rc_dev *dev, unsigned *txbuf, unsigned count)  in loop_tx_ir()
93 	struct loopback_dev *lodev = dev->priv;  in loop_tx_ir()
98 	if (lodev->txcarrier < lodev->rxcarriermin ||  in loop_tx_ir()
99 	    lodev->txcarrier > lodev->rxcarriermax) {  in loop_tx_ir()
104 	if (lodev->learning)  in loop_tx_ir()
109 	if (!(rxmask & lodev->txmask)) {  in loop_tx_ir()
123 	rawir.duration = dev->timeout;  in loop_tx_ir()
132 static void loop_set_idle(struct rc_dev *dev, bool enable)  in loop_set_idle()  argument
134 	struct loopback_dev *lodev = dev->priv;  in loop_set_idle()
136 	if (lodev->idle != enable) {  in loop_set_idle()
137 		dprintk("%sing idle mode\n", enable ? "enter" : "exit");  in loop_set_idle()
138 		lodev->idle = enable;  in loop_set_idle()
142 static int loop_set_learning_mode(struct rc_dev *dev, int enable)  in loop_set_learning_mode()  argument
144 	struct loopback_dev *lodev = dev->priv;  in loop_set_learning_mode()
146 	if (lodev->learning != enable) {  in loop_set_learning_mode()
147 		dprintk("%sing learning mode\n", enable ? "enter" : "exit");  in loop_set_learning_mode()
148 		lodev->learning = !!enable;  in loop_set_learning_mode()
154 static int loop_set_carrier_report(struct rc_dev *dev, int enable)  in loop_set_carrier_report()  argument
156 	struct loopback_dev *lodev = dev->priv;  in loop_set_carrier_report()
158 	if (lodev->carrierreport != enable) {  in loop_set_carrier_report()
159 		dprintk("%sabling carrier reports\n", enable ? "en" : "dis");  in loop_set_carrier_report()
160 		lodev->carrierreport = !!enable;  in loop_set_carrier_report()
166 static int loop_set_wakeup_filter(struct rc_dev *dev,  in loop_set_wakeup_filter()
169 	static const unsigned int max = 512;  in loop_set_wakeup_filter()
175 	if (!sc->mask)  in loop_set_wakeup_filter()
181 		return -ENOMEM;  in loop_set_wakeup_filter()
183 	ret = ir_raw_encode_scancode(dev->wakeup_protocol, sc->data, raw, max);  in loop_set_wakeup_filter()
185 	if (ret == -ENOBUFS)  in loop_set_wakeup_filter()
201 static int __init loop_init(void)  in loop_init()
209 		return -ENOMEM;  in loop_init()
212 	rc->device_name		= "rc-core loopback device";  in loop_init()
213 	rc->input_phys		= "rc-core/virtual";  in loop_init()
214 	rc->input_id.bustype	= BUS_VIRTUAL;  in loop_init()
215 	rc->input_id.version	= 1;  in loop_init()
216 	rc->driver_name		= DRIVER_NAME;  in loop_init()
217 	rc->map_name		= RC_MAP_EMPTY;  in loop_init()
218 	rc->priv		= &loopdev;  in loop_init()
219 	rc->allowed_protocols	= RC_PROTO_BIT_ALL_IR_DECODER;  in loop_init()
220 	rc->allowed_wakeup_protocols = RC_PROTO_BIT_ALL_IR_ENCODER;  in loop_init()
221 	rc->encode_wakeup	= true;  in loop_init()
222 	rc->timeout		= MS_TO_US(100); /* 100 ms */  in loop_init()
223 	rc->min_timeout		= 1;  in loop_init()
224 	rc->max_timeout		= UINT_MAX;  in loop_init()
225 	rc->rx_resolution	= 1;  in loop_init()
226 	rc->tx_resolution	= 1;  in loop_init()
227 	rc->s_tx_mask		= loop_set_tx_mask;  in loop_init()
228 	rc->s_tx_carrier	= loop_set_tx_carrier;  in loop_init()
229 	rc->s_tx_duty_cycle	= loop_set_tx_duty_cycle;  in loop_init()
230 	rc->s_rx_carrier_range	= loop_set_rx_carrier_range;  in loop_init()
231 	rc->tx_ir		= loop_tx_ir;  in loop_init()
232 	rc->s_idle		= loop_set_idle;  in loop_init()
233 	rc->s_learning_mode	= loop_set_learning_mode;  in loop_init()
234 	rc->s_carrier_report	= loop_set_carrier_report;  in loop_init()
235 	rc->s_wakeup_filter	= loop_set_wakeup_filter;  in loop_init()
257 static void __exit loop_exit(void)  in loop_exit()
266 MODULE_PARM_DESC(debug, "Enable debug messages");
268 MODULE_DESCRIPTION("Loopback device for rc-core debugging");