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ab15d248 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
a56960e8 HV |
2 | /* |
3 | * cec - HDMI Consumer Electronics Control support header | |
4 | * | |
5 | * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved. | |
a56960e8 HV |
6 | */ |
7 | ||
8 | #ifndef _MEDIA_CEC_H | |
9 | #define _MEDIA_CEC_H | |
10 | ||
11 | #include <linux/poll.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/debugfs.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/cdev.h> | |
16 | #include <linux/kthread.h> | |
17 | #include <linux/timer.h> | |
18 | #include <linux/cec-funcs.h> | |
19 | #include <media/rc-core.h> | |
e3a93adc | 20 | #include <media/cec-notifier.h> |
a56960e8 | 21 | |
ee0c503e HV |
22 | #define CEC_CAP_DEFAULTS (CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT | \ |
23 | CEC_CAP_PASSTHROUGH | CEC_CAP_RC) | |
24 | ||
a56960e8 HV |
25 | /** |
26 | * struct cec_devnode - cec device node | |
27 | * @dev: cec device | |
28 | * @cdev: cec character device | |
a56960e8 HV |
29 | * @minor: device node minor number |
30 | * @registered: the device was correctly registered | |
31 | * @unregistered: the device was unregistered | |
32 | * @fhs_lock: lock to control access to the filehandle list | |
33 | * @fhs: the list of open filehandles (cec_fh) | |
34 | * | |
35 | * This structure represents a cec-related device node. | |
36 | * | |
37 | * The @parent is a physical device. It must be set by core or device drivers | |
38 | * before registering the node. | |
39 | */ | |
40 | struct cec_devnode { | |
41 | /* sysfs */ | |
42 | struct device dev; | |
43 | struct cdev cdev; | |
a56960e8 HV |
44 | |
45 | /* device info */ | |
46 | int minor; | |
47 | bool registered; | |
48 | bool unregistered; | |
a56960e8 | 49 | struct list_head fhs; |
62148f09 | 50 | struct mutex lock; |
a56960e8 HV |
51 | }; |
52 | ||
53 | struct cec_adapter; | |
54 | struct cec_data; | |
ea5c8ef2 | 55 | struct cec_pin; |
a56960e8 HV |
56 | |
57 | struct cec_data { | |
58 | struct list_head list; | |
59 | struct list_head xfer_list; | |
60 | struct cec_adapter *adap; | |
61 | struct cec_msg msg; | |
62 | struct cec_fh *fh; | |
63 | struct delayed_work work; | |
64 | struct completion c; | |
65 | u8 attempts; | |
a56960e8 HV |
66 | bool blocking; |
67 | bool completed; | |
68 | }; | |
69 | ||
70 | struct cec_msg_entry { | |
71 | struct list_head list; | |
72 | struct cec_msg msg; | |
73 | }; | |
74 | ||
6b2bbb08 HV |
75 | struct cec_event_entry { |
76 | struct list_head list; | |
77 | struct cec_event ev; | |
78 | }; | |
79 | ||
80 | #define CEC_NUM_CORE_EVENTS 2 | |
4786b0d6 | 81 | #define CEC_NUM_EVENTS CEC_EVENT_PIN_5V_HIGH |
a56960e8 HV |
82 | |
83 | struct cec_fh { | |
84 | struct list_head list; | |
85 | struct list_head xfer_list; | |
86 | struct cec_adapter *adap; | |
87 | u8 mode_initiator; | |
88 | u8 mode_follower; | |
89 | ||
90 | /* Events */ | |
91 | wait_queue_head_t wait; | |
a56960e8 | 92 | struct mutex lock; |
6b2bbb08 | 93 | struct list_head events[CEC_NUM_EVENTS]; /* queued events */ |
6ec1cbf6 | 94 | u16 queued_events[CEC_NUM_EVENTS]; |
6b2bbb08 HV |
95 | unsigned int total_queued_events; |
96 | struct cec_event_entry core_events[CEC_NUM_CORE_EVENTS]; | |
a56960e8 HV |
97 | struct list_head msgs; /* queued messages */ |
98 | unsigned int queued_msgs; | |
99 | }; | |
100 | ||
101 | #define CEC_SIGNAL_FREE_TIME_RETRY 3 | |
102 | #define CEC_SIGNAL_FREE_TIME_NEW_INITIATOR 5 | |
103 | #define CEC_SIGNAL_FREE_TIME_NEXT_XFER 7 | |
104 | ||
105 | /* The nominal data bit period is 2.4 ms */ | |
106 | #define CEC_FREE_TIME_TO_USEC(ft) ((ft) * 2400) | |
107 | ||
108 | struct cec_adap_ops { | |
109 | /* Low-level callbacks */ | |
110 | int (*adap_enable)(struct cec_adapter *adap, bool enable); | |
111 | int (*adap_monitor_all_enable)(struct cec_adapter *adap, bool enable); | |
48ea2e92 | 112 | int (*adap_monitor_pin_enable)(struct cec_adapter *adap, bool enable); |
a56960e8 HV |
113 | int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr); |
114 | int (*adap_transmit)(struct cec_adapter *adap, u8 attempts, | |
115 | u32 signal_free_time, struct cec_msg *msg); | |
116 | void (*adap_status)(struct cec_adapter *adap, struct seq_file *file); | |
e6259b5f | 117 | void (*adap_free)(struct cec_adapter *adap); |
a56960e8 | 118 | |
9ca400c1 HV |
119 | /* Error injection callbacks */ |
120 | int (*error_inj_show)(struct cec_adapter *adap, struct seq_file *sf); | |
121 | bool (*error_inj_parse_line)(struct cec_adapter *adap, char *line); | |
122 | ||
a56960e8 HV |
123 | /* High-level CEC message callback */ |
124 | int (*received)(struct cec_adapter *adap, struct cec_msg *msg); | |
125 | }; | |
126 | ||
127 | /* | |
128 | * The minimum message length you can receive (excepting poll messages) is 2. | |
129 | * With a transfer rate of at most 36 bytes per second this makes 18 messages | |
130 | * per second worst case. | |
131 | * | |
11065f85 HV |
132 | * We queue at most 3 seconds worth of received messages. The CEC specification |
133 | * requires that messages are replied to within a second, so 3 seconds should | |
134 | * give more than enough margin. Since most messages are actually more than 2 | |
135 | * bytes, this is in practice a lot more than 3 seconds. | |
a56960e8 | 136 | */ |
11065f85 HV |
137 | #define CEC_MAX_MSG_RX_QUEUE_SZ (18 * 3) |
138 | ||
139 | /* | |
140 | * The transmit queue is limited to 1 second worth of messages (worst case). | |
141 | * Messages can be transmitted by userspace and kernel space. But for both it | |
142 | * makes no sense to have a lot of messages queued up. One second seems | |
143 | * reasonable. | |
144 | */ | |
145 | #define CEC_MAX_MSG_TX_QUEUE_SZ (18 * 1) | |
a56960e8 HV |
146 | |
147 | struct cec_adapter { | |
148 | struct module *owner; | |
149 | char name[32]; | |
150 | struct cec_devnode devnode; | |
151 | struct mutex lock; | |
152 | struct rc_dev *rc; | |
153 | ||
154 | struct list_head transmit_queue; | |
11065f85 | 155 | unsigned int transmit_queue_sz; |
a56960e8 HV |
156 | struct list_head wait_queue; |
157 | struct cec_data *transmitting; | |
32804fcb | 158 | bool transmit_in_progress; |
a56960e8 HV |
159 | |
160 | struct task_struct *kthread_config; | |
161 | struct completion config_completion; | |
162 | ||
163 | struct task_struct *kthread; | |
164 | wait_queue_head_t kthread_waitq; | |
165 | wait_queue_head_t waitq; | |
166 | ||
167 | const struct cec_adap_ops *ops; | |
168 | void *priv; | |
169 | u32 capabilities; | |
170 | u8 available_log_addrs; | |
171 | ||
172 | u16 phys_addr; | |
f902c1e9 | 173 | bool needs_hpd; |
a56960e8 HV |
174 | bool is_configuring; |
175 | bool is_configured; | |
28e11b15 | 176 | bool cec_pin_is_high; |
7d867a1b | 177 | u8 last_initiator; |
a56960e8 | 178 | u32 monitor_all_cnt; |
b8d62f50 | 179 | u32 monitor_pin_cnt; |
a56960e8 HV |
180 | u32 follower_cnt; |
181 | struct cec_fh *cec_follower; | |
182 | struct cec_fh *cec_initiator; | |
183 | bool passthrough; | |
184 | struct cec_log_addrs log_addrs; | |
185 | ||
bb789e03 HV |
186 | u32 tx_timeouts; |
187 | ||
e94c3281 | 188 | #ifdef CONFIG_CEC_NOTIFIER |
e3a93adc HV |
189 | struct cec_notifier *notifier; |
190 | #endif | |
ea5c8ef2 HV |
191 | #ifdef CONFIG_CEC_PIN |
192 | struct cec_pin *pin; | |
193 | #endif | |
e3a93adc | 194 | |
a56960e8 HV |
195 | struct dentry *cec_dir; |
196 | struct dentry *status_file; | |
9ca400c1 | 197 | struct dentry *error_inj_file; |
a56960e8 HV |
198 | |
199 | u16 phys_addrs[15]; | |
200 | u32 sequence; | |
201 | ||
a56960e8 | 202 | char input_phys[32]; |
a56960e8 HV |
203 | }; |
204 | ||
0b0b97dc JA |
205 | static inline void *cec_get_drvdata(const struct cec_adapter *adap) |
206 | { | |
207 | return adap->priv; | |
208 | } | |
209 | ||
a56960e8 HV |
210 | static inline bool cec_has_log_addr(const struct cec_adapter *adap, u8 log_addr) |
211 | { | |
212 | return adap->log_addrs.log_addr_mask & (1 << log_addr); | |
213 | } | |
214 | ||
215 | static inline bool cec_is_sink(const struct cec_adapter *adap) | |
216 | { | |
217 | return adap->phys_addr == 0; | |
218 | } | |
219 | ||
c8959a39 HV |
220 | /** |
221 | * cec_is_registered() - is the CEC adapter registered? | |
222 | * | |
223 | * @adap: the CEC adapter, may be NULL. | |
224 | * | |
225 | * Return: true if the adapter is registered, false otherwise. | |
226 | */ | |
227 | static inline bool cec_is_registered(const struct cec_adapter *adap) | |
228 | { | |
229 | return adap && adap->devnode.registered; | |
230 | } | |
231 | ||
ee7e9871 HV |
232 | #define cec_phys_addr_exp(pa) \ |
233 | ((pa) >> 12), ((pa) >> 8) & 0xf, ((pa) >> 4) & 0xf, (pa) & 0xf | |
234 | ||
23111ec3 HV |
235 | struct edid; |
236 | ||
f9f314f3 | 237 | #if IS_REACHABLE(CONFIG_CEC_CORE) |
a56960e8 | 238 | struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops, |
f51e8080 HV |
239 | void *priv, const char *name, u32 caps, u8 available_las); |
240 | int cec_register_adapter(struct cec_adapter *adap, struct device *parent); | |
a56960e8 HV |
241 | void cec_unregister_adapter(struct cec_adapter *adap); |
242 | void cec_delete_adapter(struct cec_adapter *adap); | |
243 | ||
244 | int cec_s_log_addrs(struct cec_adapter *adap, struct cec_log_addrs *log_addrs, | |
245 | bool block); | |
246 | void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, | |
247 | bool block); | |
23111ec3 HV |
248 | void cec_s_phys_addr_from_edid(struct cec_adapter *adap, |
249 | const struct edid *edid); | |
a56960e8 HV |
250 | int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg, |
251 | bool block); | |
252 | ||
253 | /* Called by the adapter */ | |
0861ad14 HV |
254 | void cec_transmit_done_ts(struct cec_adapter *adap, u8 status, |
255 | u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt, | |
256 | u8 error_cnt, ktime_t ts); | |
257 | ||
258 | static inline void cec_transmit_done(struct cec_adapter *adap, u8 status, | |
259 | u8 arb_lost_cnt, u8 nack_cnt, | |
260 | u8 low_drive_cnt, u8 error_cnt) | |
261 | { | |
262 | cec_transmit_done_ts(adap, status, arb_lost_cnt, nack_cnt, | |
263 | low_drive_cnt, error_cnt, ktime_get()); | |
264 | } | |
c94cdc1e HV |
265 | /* |
266 | * Simplified version of cec_transmit_done for hardware that doesn't retry | |
267 | * failed transmits. So this is always just one attempt in which case | |
268 | * the status is sufficient. | |
269 | */ | |
0861ad14 HV |
270 | void cec_transmit_attempt_done_ts(struct cec_adapter *adap, |
271 | u8 status, ktime_t ts); | |
272 | ||
273 | static inline void cec_transmit_attempt_done(struct cec_adapter *adap, | |
274 | u8 status) | |
275 | { | |
276 | cec_transmit_attempt_done_ts(adap, status, ktime_get()); | |
277 | } | |
278 | ||
279 | void cec_received_msg_ts(struct cec_adapter *adap, | |
280 | struct cec_msg *msg, ktime_t ts); | |
281 | ||
282 | static inline void cec_received_msg(struct cec_adapter *adap, | |
283 | struct cec_msg *msg) | |
284 | { | |
285 | cec_received_msg_ts(adap, msg, ktime_get()); | |
286 | } | |
a56960e8 | 287 | |
b8d62f50 | 288 | /** |
9a6b2a87 | 289 | * cec_queue_pin_cec_event() - queue a CEC pin event with a given timestamp. |
b8d62f50 HV |
290 | * |
291 | * @adap: pointer to the cec adapter | |
9a6b2a87 | 292 | * @is_high: when true the CEC pin is high, otherwise it is low |
6ec1cbf6 | 293 | * @dropped_events: when true some events were dropped |
b8d62f50 HV |
294 | * @ts: the timestamp for this event |
295 | * | |
296 | */ | |
6ec1cbf6 HV |
297 | void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high, |
298 | bool dropped_events, ktime_t ts); | |
b8d62f50 | 299 | |
333ef6bd HV |
300 | /** |
301 | * cec_queue_pin_hpd_event() - queue a pin event with a given timestamp. | |
302 | * | |
303 | * @adap: pointer to the cec adapter | |
304 | * @is_high: when true the HPD pin is high, otherwise it is low | |
305 | * @ts: the timestamp for this event | |
306 | * | |
307 | */ | |
308 | void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts); | |
309 | ||
4786b0d6 HV |
310 | /** |
311 | * cec_queue_pin_5v_event() - queue a pin event with a given timestamp. | |
312 | * | |
313 | * @adap: pointer to the cec adapter | |
314 | * @is_high: when true the 5V pin is high, otherwise it is low | |
315 | * @ts: the timestamp for this event | |
316 | * | |
317 | */ | |
318 | void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts); | |
319 | ||
ee7e9871 HV |
320 | /** |
321 | * cec_get_edid_phys_addr() - find and return the physical address | |
322 | * | |
323 | * @edid: pointer to the EDID data | |
324 | * @size: size in bytes of the EDID data | |
325 | * @offset: If not %NULL then the location of the physical address | |
326 | * bytes in the EDID will be returned here. This is set to 0 | |
327 | * if there is no physical address found. | |
328 | * | |
329 | * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none. | |
330 | */ | |
331 | u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size, | |
332 | unsigned int *offset); | |
333 | ||
a56960e8 HV |
334 | #else |
335 | ||
f51e8080 HV |
336 | static inline int cec_register_adapter(struct cec_adapter *adap, |
337 | struct device *parent) | |
a56960e8 HV |
338 | { |
339 | return 0; | |
340 | } | |
341 | ||
342 | static inline void cec_unregister_adapter(struct cec_adapter *adap) | |
343 | { | |
344 | } | |
345 | ||
346 | static inline void cec_delete_adapter(struct cec_adapter *adap) | |
347 | { | |
348 | } | |
349 | ||
350 | static inline void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, | |
351 | bool block) | |
352 | { | |
353 | } | |
354 | ||
23111ec3 HV |
355 | static inline void cec_s_phys_addr_from_edid(struct cec_adapter *adap, |
356 | const struct edid *edid) | |
357 | { | |
358 | } | |
359 | ||
ee7e9871 HV |
360 | static inline u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size, |
361 | unsigned int *offset) | |
362 | { | |
363 | if (offset) | |
364 | *offset = 0; | |
365 | return CEC_PHYS_ADDR_INVALID; | |
366 | } | |
367 | ||
a56960e8 HV |
368 | #endif |
369 | ||
13532789 HV |
370 | /** |
371 | * cec_phys_addr_invalidate() - set the physical address to INVALID | |
372 | * | |
373 | * @adap: the CEC adapter | |
374 | * | |
375 | * This is a simple helper function to invalidate the physical | |
376 | * address. | |
377 | */ | |
378 | static inline void cec_phys_addr_invalidate(struct cec_adapter *adap) | |
379 | { | |
380 | cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false); | |
381 | } | |
382 | ||
b915bf57 HV |
383 | /** |
384 | * cec_get_edid_spa_location() - find location of the Source Physical Address | |
385 | * | |
386 | * @edid: the EDID | |
387 | * @size: the size of the EDID | |
388 | * | |
389 | * This EDID is expected to be a CEA-861 compliant, which means that there are | |
390 | * at least two blocks and one or more of the extensions blocks are CEA-861 | |
391 | * blocks. | |
392 | * | |
393 | * The returned location is guaranteed to be <= size-2. | |
394 | * | |
395 | * This is an inline function since it is used by both CEC and V4L2. | |
396 | * Ideally this would go in a module shared by both, but it is overkill to do | |
397 | * that for just a single function. | |
398 | */ | |
399 | static inline unsigned int cec_get_edid_spa_location(const u8 *edid, | |
400 | unsigned int size) | |
401 | { | |
402 | unsigned int blocks = size / 128; | |
403 | unsigned int block; | |
404 | u8 d; | |
405 | ||
406 | /* Sanity check: at least 2 blocks and a multiple of the block size */ | |
407 | if (blocks < 2 || size % 128) | |
408 | return 0; | |
409 | ||
410 | /* | |
411 | * If there are fewer extension blocks than the size, then update | |
412 | * 'blocks'. It is allowed to have more extension blocks than the size, | |
413 | * since some hardware can only read e.g. 256 bytes of the EDID, even | |
414 | * though more blocks are present. The first CEA-861 extension block | |
415 | * should normally be in block 1 anyway. | |
416 | */ | |
417 | if (edid[0x7e] + 1 < blocks) | |
418 | blocks = edid[0x7e] + 1; | |
419 | ||
420 | for (block = 1; block < blocks; block++) { | |
421 | unsigned int offset = block * 128; | |
422 | ||
423 | /* Skip any non-CEA-861 extension blocks */ | |
424 | if (edid[offset] != 0x02 || edid[offset + 1] != 0x03) | |
425 | continue; | |
426 | ||
427 | /* search Vendor Specific Data Block (tag 3) */ | |
428 | d = edid[offset + 2] & 0x7f; | |
429 | /* Check if there are Data Blocks */ | |
430 | if (d <= 4) | |
431 | continue; | |
432 | if (d > 4) { | |
433 | unsigned int i = offset + 4; | |
434 | unsigned int end = offset + d; | |
435 | ||
436 | /* Note: 'end' is always < 'size' */ | |
437 | do { | |
438 | u8 tag = edid[i] >> 5; | |
439 | u8 len = edid[i] & 0x1f; | |
440 | ||
441 | if (tag == 3 && len >= 5 && i + len <= end && | |
442 | edid[i + 1] == 0x03 && | |
443 | edid[i + 2] == 0x0c && | |
444 | edid[i + 3] == 0x00) | |
445 | return i + 4; | |
446 | i += len + 1; | |
447 | } while (i < end); | |
448 | } | |
449 | } | |
450 | return 0; | |
451 | } | |
452 | ||
a56960e8 | 453 | #endif /* _MEDIA_CEC_H */ |