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801c73c0 DH |
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 | * 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 | |
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 | ||
36 | static bool debug; | |
37 | ||
38 | struct 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 | ||
50 | static struct loopback_dev loopdev; | |
51 | ||
52 | static 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 | ||
66 | static 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 | ||
75 | static 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 | ||
89 | static 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 | ||
5588dc2b | 104 | static int loop_tx_ir(struct rc_dev *dev, unsigned *txbuf, unsigned count) |
801c73c0 DH |
105 | { |
106 | struct loopback_dev *lodev = dev->priv; | |
107 | u32 rxmask; | |
801c73c0 DH |
108 | unsigned i; |
109 | DEFINE_IR_RAW_EVENT(rawir); | |
110 | ||
801c73c0 DH |
111 | if (lodev->txcarrier < lodev->rxcarriermin || |
112 | lodev->txcarrier > lodev->rxcarriermax) { | |
113 | dprintk("ignoring tx, carrier out of range\n"); | |
114 | goto out; | |
115 | } | |
116 | ||
117 | if (lodev->learning) | |
118 | rxmask = RXMASK_LEARNING; | |
119 | else | |
120 | rxmask = RXMASK_REGULAR; | |
121 | ||
122 | if (!(rxmask & lodev->txmask)) { | |
123 | dprintk("ignoring tx, rx mask mismatch\n"); | |
124 | goto out; | |
125 | } | |
126 | ||
127 | for (i = 0; i < count; i++) { | |
128 | rawir.pulse = i % 2 ? false : true; | |
5588dc2b | 129 | rawir.duration = txbuf[i] * 1000; |
801c73c0 DH |
130 | if (rawir.duration) |
131 | ir_raw_event_store_with_filter(dev, &rawir); | |
132 | } | |
08ffff9f DH |
133 | |
134 | /* Fake a silence long enough to cause us to go idle */ | |
135 | rawir.pulse = false; | |
136 | rawir.duration = dev->timeout; | |
137 | ir_raw_event_store_with_filter(dev, &rawir); | |
138 | ||
801c73c0 DH |
139 | ir_raw_event_handle(dev); |
140 | ||
141 | out: | |
5588dc2b | 142 | return count; |
801c73c0 DH |
143 | } |
144 | ||
145 | static void loop_set_idle(struct rc_dev *dev, bool enable) | |
146 | { | |
147 | struct loopback_dev *lodev = dev->priv; | |
148 | ||
149 | if (lodev->idle != enable) { | |
150 | dprintk("%sing idle mode\n", enable ? "enter" : "exit"); | |
151 | lodev->idle = enable; | |
152 | } | |
153 | } | |
154 | ||
155 | static int loop_set_learning_mode(struct rc_dev *dev, int enable) | |
156 | { | |
157 | struct loopback_dev *lodev = dev->priv; | |
158 | ||
159 | if (lodev->learning != enable) { | |
160 | dprintk("%sing learning mode\n", enable ? "enter" : "exit"); | |
161 | lodev->learning = !!enable; | |
162 | } | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static int loop_set_carrier_report(struct rc_dev *dev, int enable) | |
168 | { | |
169 | struct loopback_dev *lodev = dev->priv; | |
170 | ||
171 | if (lodev->carrierreport != enable) { | |
172 | dprintk("%sabling carrier reports\n", enable ? "en" : "dis"); | |
173 | lodev->carrierreport = !!enable; | |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static int __init loop_init(void) | |
180 | { | |
181 | struct rc_dev *rc; | |
182 | int ret; | |
183 | ||
184 | rc = rc_allocate_device(); | |
185 | if (!rc) { | |
186 | printk(KERN_ERR DRIVER_NAME ": rc_dev allocation failed\n"); | |
187 | return -ENOMEM; | |
188 | } | |
189 | ||
190 | rc->input_name = "rc-core loopback device"; | |
191 | rc->input_phys = "rc-core/virtual"; | |
192 | rc->input_id.bustype = BUS_VIRTUAL; | |
193 | rc->input_id.version = 1; | |
194 | rc->driver_name = DRIVER_NAME; | |
195 | rc->map_name = RC_MAP_EMPTY; | |
196 | rc->priv = &loopdev; | |
197 | rc->driver_type = RC_DRIVER_IR_RAW; | |
c5540fbb | 198 | rc->allowed_protocols = RC_BIT_ALL; |
801c73c0 DH |
199 | rc->timeout = 100 * 1000 * 1000; /* 100 ms */ |
200 | rc->min_timeout = 1; | |
201 | rc->max_timeout = UINT_MAX; | |
202 | rc->rx_resolution = 1000; | |
203 | rc->tx_resolution = 1000; | |
204 | rc->s_tx_mask = loop_set_tx_mask; | |
205 | rc->s_tx_carrier = loop_set_tx_carrier; | |
206 | rc->s_tx_duty_cycle = loop_set_tx_duty_cycle; | |
207 | rc->s_rx_carrier_range = loop_set_rx_carrier_range; | |
208 | rc->tx_ir = loop_tx_ir; | |
209 | rc->s_idle = loop_set_idle; | |
210 | rc->s_learning_mode = loop_set_learning_mode; | |
211 | rc->s_carrier_report = loop_set_carrier_report; | |
801c73c0 DH |
212 | |
213 | loopdev.txmask = RXMASK_REGULAR; | |
214 | loopdev.txcarrier = 36000; | |
215 | loopdev.txduty = 50; | |
216 | loopdev.rxcarriermin = 1; | |
217 | loopdev.rxcarriermax = ~0; | |
218 | loopdev.idle = true; | |
219 | loopdev.learning = false; | |
220 | loopdev.carrierreport = false; | |
221 | ||
222 | ret = rc_register_device(rc); | |
223 | if (ret < 0) { | |
224 | printk(KERN_ERR DRIVER_NAME ": rc_dev registration failed\n"); | |
225 | rc_free_device(rc); | |
226 | return ret; | |
227 | } | |
228 | ||
229 | loopdev.dev = rc; | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static void __exit loop_exit(void) | |
234 | { | |
235 | rc_unregister_device(loopdev.dev); | |
236 | } | |
237 | ||
238 | module_init(loop_init); | |
239 | module_exit(loop_exit); | |
240 | ||
241 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
242 | MODULE_PARM_DESC(debug, "Enable debug messages"); | |
243 | ||
244 | MODULE_DESCRIPTION("Loopback device for rc-core debugging"); | |
245 | MODULE_AUTHOR("David Härdeman <david@hardeman.nu>"); | |
246 | MODULE_LICENSE("GPL"); |