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ca414698 JW |
1 | /* ir-lirc-codec.c - ir-core to classic lirc interface bridge |
2 | * | |
3 | * Copyright (C) 2010 by Jarod Wilson <jarod@redhat.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation version 2 of the License. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/sched.h> | |
16 | #include <linux/wait.h> | |
17 | #include <media/lirc.h> | |
5690085e | 18 | #include <media/lirc_dev.h> |
ca414698 JW |
19 | #include <media/ir-core.h> |
20 | #include "ir-core-priv.h" | |
ca414698 JW |
21 | |
22 | #define LIRCBUF_SIZE 256 | |
23 | ||
24 | /** | |
25 | * ir_lirc_decode() - Send raw IR data to lirc_dev to be relayed to the | |
26 | * lircd userspace daemon for decoding. | |
27 | * @input_dev: the struct input_dev descriptor of the device | |
28 | * @duration: the struct ir_raw_event descriptor of the pulse/space | |
29 | * | |
30 | * This function returns -EINVAL if the lirc interfaces aren't wired up. | |
31 | */ | |
32 | static int ir_lirc_decode(struct input_dev *input_dev, struct ir_raw_event ev) | |
33 | { | |
34 | struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); | |
510fcb70 | 35 | int sample; |
ca414698 JW |
36 | |
37 | if (!(ir_dev->raw->enabled_protocols & IR_TYPE_LIRC)) | |
38 | return 0; | |
39 | ||
40 | if (!ir_dev->raw->lirc.drv || !ir_dev->raw->lirc.drv->rbuf) | |
41 | return -EINVAL; | |
42 | ||
510fcb70 ML |
43 | if (IS_RESET(ev)) |
44 | return 0; | |
45 | ||
ca414698 JW |
46 | IR_dprintk(2, "LIRC data transfer started (%uus %s)\n", |
47 | TO_US(ev.duration), TO_STR(ev.pulse)); | |
48 | ||
510fcb70 | 49 | sample = ev.duration / 1000; |
ca414698 | 50 | if (ev.pulse) |
510fcb70 | 51 | sample |= PULSE_BIT; |
ca414698 JW |
52 | |
53 | lirc_buffer_write(ir_dev->raw->lirc.drv->rbuf, | |
510fcb70 | 54 | (unsigned char *) &sample); |
ca414698 JW |
55 | wake_up(&ir_dev->raw->lirc.drv->rbuf->wait_poll); |
56 | ||
ca414698 JW |
57 | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf, | |
62 | size_t n, loff_t *ppos) | |
63 | { | |
64 | struct lirc_codec *lirc; | |
65 | struct ir_input_dev *ir_dev; | |
66 | int *txbuf; /* buffer with values to transmit */ | |
67 | int ret = 0, count; | |
68 | ||
69 | lirc = lirc_get_pdata(file); | |
70 | if (!lirc) | |
71 | return -EFAULT; | |
72 | ||
73 | if (n % sizeof(int)) | |
74 | return -EINVAL; | |
75 | ||
76 | count = n / sizeof(int); | |
77 | if (count > LIRCBUF_SIZE || count % 2 == 0) | |
78 | return -EINVAL; | |
79 | ||
6efb870a JW |
80 | txbuf = memdup_user(buf, n); |
81 | if (IS_ERR(txbuf)) | |
82 | return PTR_ERR(txbuf); | |
ca414698 JW |
83 | |
84 | ir_dev = lirc->ir_dev; | |
85 | if (!ir_dev) { | |
86 | ret = -EFAULT; | |
87 | goto out; | |
88 | } | |
89 | ||
90 | if (ir_dev->props && ir_dev->props->tx_ir) | |
91 | ret = ir_dev->props->tx_ir(ir_dev->props->priv, txbuf, (u32)n); | |
92 | ||
93 | out: | |
94 | kfree(txbuf); | |
95 | return ret; | |
96 | } | |
97 | ||
e589333f ML |
98 | static long ir_lirc_ioctl(struct file *filep, unsigned int cmd, |
99 | unsigned long __user arg) | |
ca414698 JW |
100 | { |
101 | struct lirc_codec *lirc; | |
102 | struct ir_input_dev *ir_dev; | |
103 | int ret = 0; | |
104 | void *drv_data; | |
e589333f | 105 | unsigned long val = 0; |
ca414698 JW |
106 | |
107 | lirc = lirc_get_pdata(filep); | |
108 | if (!lirc) | |
109 | return -EFAULT; | |
110 | ||
111 | ir_dev = lirc->ir_dev; | |
112 | if (!ir_dev || !ir_dev->props || !ir_dev->props->priv) | |
113 | return -EFAULT; | |
114 | ||
115 | drv_data = ir_dev->props->priv; | |
116 | ||
e589333f | 117 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
ca414698 JW |
118 | ret = get_user(val, (unsigned long *)arg); |
119 | if (ret) | |
120 | return ret; | |
e589333f ML |
121 | } |
122 | ||
123 | switch (cmd) { | |
124 | ||
125 | /* legacy support */ | |
126 | case LIRC_GET_SEND_MODE: | |
127 | val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK; | |
128 | break; | |
129 | ||
130 | case LIRC_SET_SEND_MODE: | |
131 | if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK)) | |
132 | return -EINVAL; | |
133 | break; | |
ca414698 | 134 | |
e589333f ML |
135 | /* TX settings */ |
136 | case LIRC_SET_TRANSMITTER_MASK: | |
137 | if (ir_dev->props->s_tx_mask) | |
ca414698 JW |
138 | ret = ir_dev->props->s_tx_mask(drv_data, (u32)val); |
139 | else | |
140 | return -EINVAL; | |
141 | break; | |
142 | ||
143 | case LIRC_SET_SEND_CARRIER: | |
e589333f | 144 | if (ir_dev->props->s_tx_carrier) |
ca414698 JW |
145 | ir_dev->props->s_tx_carrier(drv_data, (u32)val); |
146 | else | |
147 | return -EINVAL; | |
148 | break; | |
149 | ||
e589333f ML |
150 | case LIRC_SET_SEND_DUTY_CYCLE: |
151 | if (!ir_dev->props->s_tx_duty_cycle) | |
152 | return -ENOSYS; | |
153 | ||
154 | if (val <= 0 || val >= 100) | |
155 | return -EINVAL; | |
156 | ||
157 | ir_dev->props->s_tx_duty_cycle(ir_dev->props->priv, val); | |
ca414698 JW |
158 | break; |
159 | ||
e589333f ML |
160 | /* RX settings */ |
161 | case LIRC_SET_REC_CARRIER: | |
162 | if (ir_dev->props->s_rx_carrier_range) | |
163 | ret = ir_dev->props->s_rx_carrier_range( | |
164 | ir_dev->props->priv, | |
165 | ir_dev->raw->lirc.carrier_low, val); | |
166 | else | |
167 | return -ENOSYS; | |
ca414698 | 168 | |
e589333f ML |
169 | if (!ret) |
170 | ir_dev->raw->lirc.carrier_low = 0; | |
171 | break; | |
172 | ||
173 | case LIRC_SET_REC_CARRIER_RANGE: | |
174 | if (val >= 0) | |
175 | ir_dev->raw->lirc.carrier_low = val; | |
176 | break; | |
177 | ||
178 | ||
179 | case LIRC_GET_REC_RESOLUTION: | |
180 | val = ir_dev->props->rx_resolution; | |
181 | break; | |
182 | ||
183 | case LIRC_SET_WIDEBAND_RECEIVER: | |
184 | if (ir_dev->props->s_learning_mode) | |
185 | return ir_dev->props->s_learning_mode( | |
186 | ir_dev->props->priv, !!val); | |
187 | else | |
188 | return -ENOSYS; | |
189 | ||
190 | /* Generic timeout support */ | |
191 | case LIRC_GET_MIN_TIMEOUT: | |
192 | if (!ir_dev->props->max_timeout) | |
193 | return -ENOSYS; | |
194 | val = ir_dev->props->min_timeout / 1000; | |
195 | break; | |
196 | ||
197 | case LIRC_GET_MAX_TIMEOUT: | |
198 | if (!ir_dev->props->max_timeout) | |
199 | return -ENOSYS; | |
200 | val = ir_dev->props->max_timeout / 1000; | |
201 | break; | |
202 | ||
203 | case LIRC_SET_REC_TIMEOUT: | |
204 | if (val < ir_dev->props->min_timeout || | |
205 | val > ir_dev->props->max_timeout) | |
ca414698 | 206 | return -EINVAL; |
e589333f | 207 | ir_dev->props->timeout = val * 1000; |
ca414698 JW |
208 | break; |
209 | ||
210 | default: | |
044e5878 | 211 | return lirc_dev_fop_ioctl(filep, cmd, arg); |
ca414698 JW |
212 | } |
213 | ||
e589333f ML |
214 | if (_IOC_DIR(cmd) & _IOC_READ) |
215 | ret = put_user(val, (unsigned long *)arg); | |
216 | ||
ca414698 JW |
217 | return ret; |
218 | } | |
219 | ||
220 | static int ir_lirc_open(void *data) | |
221 | { | |
222 | return 0; | |
223 | } | |
224 | ||
225 | static void ir_lirc_close(void *data) | |
226 | { | |
227 | return; | |
228 | } | |
229 | ||
230 | static struct file_operations lirc_fops = { | |
231 | .owner = THIS_MODULE, | |
232 | .write = ir_lirc_transmit_ir, | |
044e5878 | 233 | .unlocked_ioctl = ir_lirc_ioctl, |
ca414698 JW |
234 | .read = lirc_dev_fop_read, |
235 | .poll = lirc_dev_fop_poll, | |
236 | .open = lirc_dev_fop_open, | |
237 | .release = lirc_dev_fop_close, | |
238 | }; | |
239 | ||
240 | static int ir_lirc_register(struct input_dev *input_dev) | |
241 | { | |
242 | struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); | |
243 | struct lirc_driver *drv; | |
244 | struct lirc_buffer *rbuf; | |
245 | int rc = -ENOMEM; | |
246 | unsigned long features; | |
247 | ||
248 | drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL); | |
249 | if (!drv) | |
250 | return rc; | |
251 | ||
252 | rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL); | |
49b7a12c | 253 | if (!rbuf) |
ca414698 JW |
254 | goto rbuf_alloc_failed; |
255 | ||
256 | rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE); | |
257 | if (rc) | |
258 | goto rbuf_init_failed; | |
259 | ||
260 | features = LIRC_CAN_REC_MODE2; | |
261 | if (ir_dev->props->tx_ir) { | |
e589333f | 262 | |
ca414698 JW |
263 | features |= LIRC_CAN_SEND_PULSE; |
264 | if (ir_dev->props->s_tx_mask) | |
265 | features |= LIRC_CAN_SET_TRANSMITTER_MASK; | |
266 | if (ir_dev->props->s_tx_carrier) | |
267 | features |= LIRC_CAN_SET_SEND_CARRIER; | |
e589333f ML |
268 | |
269 | if (ir_dev->props->s_tx_duty_cycle) | |
67332ba8 | 270 | features |= LIRC_CAN_SET_SEND_DUTY_CYCLE; |
ca414698 JW |
271 | } |
272 | ||
e589333f ML |
273 | if (ir_dev->props->s_rx_carrier_range) |
274 | features |= LIRC_CAN_SET_REC_CARRIER | | |
275 | LIRC_CAN_SET_REC_CARRIER_RANGE; | |
276 | ||
277 | if (ir_dev->props->s_learning_mode) | |
278 | features |= LIRC_CAN_USE_WIDEBAND_RECEIVER; | |
279 | ||
280 | if (ir_dev->props->max_timeout) | |
281 | features |= LIRC_CAN_SET_REC_TIMEOUT; | |
282 | ||
283 | ||
ca414698 JW |
284 | snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)", |
285 | ir_dev->driver_name); | |
286 | drv->minor = -1; | |
287 | drv->features = features; | |
288 | drv->data = &ir_dev->raw->lirc; | |
289 | drv->rbuf = rbuf; | |
290 | drv->set_use_inc = &ir_lirc_open; | |
291 | drv->set_use_dec = &ir_lirc_close; | |
292 | drv->code_length = sizeof(struct ir_raw_event) * 8; | |
293 | drv->fops = &lirc_fops; | |
294 | drv->dev = &ir_dev->dev; | |
295 | drv->owner = THIS_MODULE; | |
296 | ||
297 | drv->minor = lirc_register_driver(drv); | |
298 | if (drv->minor < 0) { | |
299 | rc = -ENODEV; | |
300 | goto lirc_register_failed; | |
301 | } | |
302 | ||
303 | ir_dev->raw->lirc.drv = drv; | |
304 | ir_dev->raw->lirc.ir_dev = ir_dev; | |
ca414698 JW |
305 | return 0; |
306 | ||
307 | lirc_register_failed: | |
308 | rbuf_init_failed: | |
309 | kfree(rbuf); | |
310 | rbuf_alloc_failed: | |
311 | kfree(drv); | |
312 | ||
313 | return rc; | |
314 | } | |
315 | ||
316 | static int ir_lirc_unregister(struct input_dev *input_dev) | |
317 | { | |
318 | struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); | |
319 | struct lirc_codec *lirc = &ir_dev->raw->lirc; | |
320 | ||
321 | lirc_unregister_driver(lirc->drv->minor); | |
322 | lirc_buffer_free(lirc->drv->rbuf); | |
323 | kfree(lirc->drv); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | static struct ir_raw_handler lirc_handler = { | |
329 | .protocols = IR_TYPE_LIRC, | |
330 | .decode = ir_lirc_decode, | |
331 | .raw_register = ir_lirc_register, | |
332 | .raw_unregister = ir_lirc_unregister, | |
333 | }; | |
334 | ||
335 | static int __init ir_lirc_codec_init(void) | |
336 | { | |
337 | ir_raw_handler_register(&lirc_handler); | |
338 | ||
339 | printk(KERN_INFO "IR LIRC bridge handler initialized\n"); | |
340 | return 0; | |
341 | } | |
342 | ||
343 | static void __exit ir_lirc_codec_exit(void) | |
344 | { | |
345 | ir_raw_handler_unregister(&lirc_handler); | |
346 | } | |
347 | ||
348 | module_init(ir_lirc_codec_init); | |
349 | module_exit(ir_lirc_codec_exit); | |
350 | ||
351 | MODULE_LICENSE("GPL"); | |
352 | MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>"); | |
353 | MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)"); | |
354 | MODULE_DESCRIPTION("LIRC IR handler bridge"); |