1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Remote Controller core header
4 *
5 * Copyright (C) 2009-2010 by Mauro Carvalho Chehab
6 */
7
8 #ifndef _RC_CORE
9 #define _RC_CORE
10
11 #include <linux/spinlock.h>
12 #include <linux/cdev.h>
13 #include <linux/kfifo.h>
14 #include <linux/time.h>
15 #include <linux/timer.h>
16 #include <media/rc-map.h>
17
18 /**
19 * enum rc_driver_type - type of the RC driver.
20 *
21 * @RC_DRIVER_SCANCODE: Driver or hardware generates a scancode.
22 * @RC_DRIVER_IR_RAW: Driver or hardware generates pulse/space sequences.
23 * It needs a Infra-Red pulse/space decoder
24 * @RC_DRIVER_IR_RAW_TX: Device transmitter only,
25 * driver requires pulse/space data sequence.
26 */
27 enum rc_driver_type {
28 RC_DRIVER_SCANCODE = 0,
29 RC_DRIVER_IR_RAW,
30 RC_DRIVER_IR_RAW_TX,
31 };
32
33 /**
34 * struct rc_scancode_filter - Filter scan codes.
35 * @data: Scancode data to match.
36 * @mask: Mask of bits of scancode to compare.
37 */
38 struct rc_scancode_filter {
39 u32 data;
40 u32 mask;
41 };
42
43 /**
44 * enum rc_filter_type - Filter type constants.
45 * @RC_FILTER_NORMAL: Filter for normal operation.
46 * @RC_FILTER_WAKEUP: Filter for waking from suspend.
47 * @RC_FILTER_MAX: Number of filter types.
48 */
49 enum rc_filter_type {
50 RC_FILTER_NORMAL = 0,
51 RC_FILTER_WAKEUP,
52
53 RC_FILTER_MAX
54 };
55
56 /**
57 * struct lirc_fh - represents an open lirc file
58 * @list: list of open file handles
59 * @rc: rcdev for this lirc chardev
60 * @carrier_low: when setting the carrier range, first the low end must be
61 * set with an ioctl and then the high end with another ioctl
62 * @rawir: queue for incoming raw IR
63 * @scancodes: queue for incoming decoded scancodes
64 * @wait_poll: poll struct for lirc device
65 * @send_mode: lirc mode for sending, either LIRC_MODE_SCANCODE or
66 * LIRC_MODE_PULSE
67 * @rec_mode: lirc mode for receiving, either LIRC_MODE_SCANCODE or
68 * LIRC_MODE_MODE2
69 */
70 struct lirc_fh {
71 struct list_head list;
72 struct rc_dev *rc;
73 int carrier_low;
74 DECLARE_KFIFO_PTR(rawir, unsigned int);
75 DECLARE_KFIFO_PTR(scancodes, struct lirc_scancode);
76 wait_queue_head_t wait_poll;
77 u8 send_mode;
78 u8 rec_mode;
79 };
80
81 /**
82 * struct rc_dev - represents a remote control device
83 * @dev: driver model's view of this device
84 * @managed_alloc: devm_rc_allocate_device was used to create rc_dev
85 * @sysfs_groups: sysfs attribute groups
86 * @device_name: name of the rc child device
87 * @input_phys: physical path to the input child device
88 * @input_id: id of the input child device (struct input_id)
89 * @driver_name: name of the hardware driver which registered this device
90 * @map_name: name of the default keymap
91 * @rc_map: current scan/key table
92 * @lock: used to ensure we've filled in all protocol details before
93 * anyone can call show_protocols or store_protocols
94 * @minor: unique minor remote control device number
95 * @raw: additional data for raw pulse/space devices
96 * @input_dev: the input child device used to communicate events to userspace
97 * @driver_type: specifies if protocol decoding is done in hardware or software
98 * @idle: used to keep track of RX state
99 * @encode_wakeup: wakeup filtering uses IR encode API, therefore the allowed
100 * wakeup protocols is the set of all raw encoders
101 * @allowed_protocols: bitmask with the supported RC_PROTO_BIT_* protocols
102 * @enabled_protocols: bitmask with the enabled RC_PROTO_BIT_* protocols
103 * @allowed_wakeup_protocols: bitmask with the supported RC_PROTO_BIT_* wakeup
104 * protocols
105 * @wakeup_protocol: the enabled RC_PROTO_* wakeup protocol or
106 * RC_PROTO_UNKNOWN if disabled.
107 * @scancode_filter: scancode filter
108 * @scancode_wakeup_filter: scancode wakeup filters
109 * @scancode_mask: some hardware decoders are not capable of providing the full
110 * scancode to the application. As this is a hardware limit, we can't do
111 * anything with it. Yet, as the same keycode table can be used with other
112 * devices, a mask is provided to allow its usage. Drivers should generally
113 * leave this field in blank
114 * @users: number of current users of the device
115 * @priv: driver-specific data
116 * @keylock: protects the remaining members of the struct
117 * @keypressed: whether a key is currently pressed
118 * @keyup_jiffies: time (in jiffies) when the current keypress should be released
119 * @timer_keyup: timer for releasing a keypress
120 * @timer_repeat: timer for autorepeat events. This is needed for CEC, which
121 * has non-standard repeats.
122 * @last_keycode: keycode of last keypress
123 * @last_protocol: protocol of last keypress
124 * @last_scancode: scancode of last keypress
125 * @last_toggle: toggle value of last command
126 * @timeout: optional time after which device stops sending data
127 * @min_timeout: minimum timeout supported by device
128 * @max_timeout: maximum timeout supported by device
129 * @rx_resolution : resolution (in us) of input sampler
130 * @lirc_dev: lirc device
131 * @lirc_cdev: lirc char cdev
132 * @gap_start: start time for gap after timeout if non-zero
133 * @lirc_fh_lock: protects lirc_fh list
134 * @lirc_fh: list of open files
135 * @registered: set to true by rc_register_device(), false by
136 * rc_unregister_device
137 * @change_protocol: allow changing the protocol used on hardware decoders
138 * @open: callback to allow drivers to enable polling/irq when IR input device
139 * is opened.
140 * @close: callback to allow drivers to disable polling/irq when IR input device
141 * is opened.
142 * @s_tx_mask: set transmitter mask (for devices with multiple tx outputs)
143 * @s_tx_carrier: set transmit carrier frequency
144 * @s_tx_duty_cycle: set transmit duty cycle (0% - 100%)
145 * @s_rx_carrier_range: inform driver about carrier it is expected to handle
146 * @tx_ir: transmit IR
147 * @s_idle: enable/disable hardware idle mode, upon which,
148 * device doesn't interrupt host until it sees IR pulses
149 * @s_wideband_receiver: enable wide band receiver used for learning
150 * @s_carrier_report: enable carrier reports
151 * @s_filter: set the scancode filter
152 * @s_wakeup_filter: set the wakeup scancode filter. If the mask is zero
153 * then wakeup should be disabled. wakeup_protocol will be set to
154 * a valid protocol if mask is nonzero.
155 * @s_timeout: set hardware timeout in us
156 */
157 struct rc_dev {
158 struct device dev;
159 bool managed_alloc;
160 const struct attribute_group *sysfs_groups[5];
161 const char *device_name;
162 const char *input_phys;
163 struct input_id input_id;
164 const char *driver_name;
165 const char *map_name;
166 struct rc_map rc_map;
167 struct mutex lock;
168 unsigned int minor;
169 struct ir_raw_event_ctrl *raw;
170 struct input_dev *input_dev;
171 enum rc_driver_type driver_type;
172 bool idle;
173 bool encode_wakeup;
174 u64 allowed_protocols;
175 u64 enabled_protocols;
176 u64 allowed_wakeup_protocols;
177 enum rc_proto wakeup_protocol;
178 struct rc_scancode_filter scancode_filter;
179 struct rc_scancode_filter scancode_wakeup_filter;
180 u32 scancode_mask;
181 u32 users;
182 void *priv;
183 spinlock_t keylock;
184 bool keypressed;
185 unsigned long keyup_jiffies;
186 struct timer_list timer_keyup;
187 struct timer_list timer_repeat;
188 u32 last_keycode;
189 enum rc_proto last_protocol;
190 u64 last_scancode;
191 u8 last_toggle;
192 u32 timeout;
193 u32 min_timeout;
194 u32 max_timeout;
195 u32 rx_resolution;
196 #ifdef CONFIG_LIRC
197 struct device lirc_dev;
198 struct cdev lirc_cdev;
199 ktime_t gap_start;
200 spinlock_t lirc_fh_lock;
201 struct list_head lirc_fh;
202 #endif
203 bool registered;
204 int (*change_protocol)(struct rc_dev *dev, u64 *rc_proto);
205 int (*open)(struct rc_dev *dev);
206 void (*close)(struct rc_dev *dev);
207 int (*s_tx_mask)(struct rc_dev *dev, u32 mask);
208 int (*s_tx_carrier)(struct rc_dev *dev, u32 carrier);
209 int (*s_tx_duty_cycle)(struct rc_dev *dev, u32 duty_cycle);
210 int (*s_rx_carrier_range)(struct rc_dev *dev, u32 min, u32 max);
211 int (*tx_ir)(struct rc_dev *dev, unsigned *txbuf, unsigned n);
212 void (*s_idle)(struct rc_dev *dev, bool enable);
213 int (*s_wideband_receiver)(struct rc_dev *dev, int enable);
214 int (*s_carrier_report) (struct rc_dev *dev, int enable);
215 int (*s_filter)(struct rc_dev *dev,
216 struct rc_scancode_filter *filter);
217 int (*s_wakeup_filter)(struct rc_dev *dev,
218 struct rc_scancode_filter *filter);
219 int (*s_timeout)(struct rc_dev *dev,
220 unsigned int timeout);
221 };
222
223 #define to_rc_dev(d) container_of(d, struct rc_dev, dev)
224
225 /*
226 * From rc-main.c
227 * Those functions can be used on any type of Remote Controller. They
228 * basically creates an input_dev and properly reports the device as a
229 * Remote Controller, at sys/class/rc.
230 */
231
232 /**
233 * rc_allocate_device - Allocates a RC device
234 *
235 * @rc_driver_type: specifies the type of the RC output to be allocated
236 * returns a pointer to struct rc_dev.
237 */
238 struct rc_dev *rc_allocate_device(enum rc_driver_type);
239
240 /**
241 * devm_rc_allocate_device - Managed RC device allocation
242 *
243 * @dev: pointer to struct device
244 * @rc_driver_type: specifies the type of the RC output to be allocated
245 * returns a pointer to struct rc_dev.
246 */
247 struct rc_dev *devm_rc_allocate_device(struct device *dev, enum rc_driver_type);
248
249 /**
250 * rc_free_device - Frees a RC device
251 *
252 * @dev: pointer to struct rc_dev.
253 */
254 void rc_free_device(struct rc_dev *dev);
255
256 /**
257 * rc_register_device - Registers a RC device
258 *
259 * @dev: pointer to struct rc_dev.
260 */
261 int rc_register_device(struct rc_dev *dev);
262
263 /**
264 * devm_rc_register_device - Manageded registering of a RC device
265 *
266 * @parent: pointer to struct device.
267 * @dev: pointer to struct rc_dev.
268 */
269 int devm_rc_register_device(struct device *parent, struct rc_dev *dev);
270
271 /**
272 * rc_unregister_device - Unregisters a RC device
273 *
274 * @dev: pointer to struct rc_dev.
275 */
276 void rc_unregister_device(struct rc_dev *dev);
277
278 void rc_repeat(struct rc_dev *dev);
279 void rc_keydown(struct rc_dev *dev, enum rc_proto protocol, u64 scancode,
280 u8 toggle);
281 void rc_keydown_notimeout(struct rc_dev *dev, enum rc_proto protocol,
282 u64 scancode, u8 toggle);
283 void rc_keyup(struct rc_dev *dev);
284 u32 rc_g_keycode_from_table(struct rc_dev *dev, u64 scancode);
285
286 /*
287 * From rc-raw.c
288 * The Raw interface is specific to InfraRed. It may be a good idea to
289 * split it later into a separate header.
290 */
291 struct ir_raw_event {
292 union {
293 u32 duration;
294 u32 carrier;
295 };
296 u8 duty_cycle;
297
298 unsigned pulse:1;
299 unsigned overflow:1;
300 unsigned timeout:1;
301 unsigned carrier_report:1;
302 };
303
304 #define US_TO_NS(usec) ((usec) * 1000)
305 #define MS_TO_US(msec) ((msec) * 1000)
306 #define IR_MAX_DURATION MS_TO_US(500)
307 #define IR_DEFAULT_TIMEOUT MS_TO_US(125)
308 #define IR_MAX_TIMEOUT LIRC_VALUE_MASK
309
310 void ir_raw_event_handle(struct rc_dev *dev);
311 int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev);
312 int ir_raw_event_store_edge(struct rc_dev *dev, bool pulse);
313 int ir_raw_event_store_with_filter(struct rc_dev *dev,
314 struct ir_raw_event *ev);
315 int ir_raw_event_store_with_timeout(struct rc_dev *dev,
316 struct ir_raw_event *ev);
317 void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
318 int ir_raw_encode_scancode(enum rc_proto protocol, u32 scancode,
319 struct ir_raw_event *events, unsigned int max);
320 int ir_raw_encode_carrier(enum rc_proto protocol);
321
ir_raw_event_overflow(struct rc_dev * dev)322 static inline void ir_raw_event_overflow(struct rc_dev *dev)
323 {
324 ir_raw_event_store(dev, &((struct ir_raw_event) { .overflow = true }));
325 dev->idle = true;
326 ir_raw_event_handle(dev);
327 }
328
329 /* extract mask bits out of data and pack them into the result */
ir_extract_bits(u32 data,u32 mask)330 static inline u32 ir_extract_bits(u32 data, u32 mask)
331 {
332 u32 vbit = 1, value = 0;
333
334 do {
335 if (mask & 1) {
336 if (data & 1)
337 value |= vbit;
338 vbit <<= 1;
339 }
340 data >>= 1;
341 } while (mask >>= 1);
342
343 return value;
344 }
345
346 /* Get NEC scancode and protocol type from address and command bytes */
ir_nec_bytes_to_scancode(u8 address,u8 not_address,u8 command,u8 not_command,enum rc_proto * protocol)347 static inline u32 ir_nec_bytes_to_scancode(u8 address, u8 not_address,
348 u8 command, u8 not_command,
349 enum rc_proto *protocol)
350 {
351 u32 scancode;
352
353 if ((command ^ not_command) != 0xff) {
354 /* NEC transport, but modified protocol, used by at
355 * least Apple and TiVo remotes
356 */
357 scancode = not_address << 24 |
358 address << 16 |
359 not_command << 8 |
360 command;
361 *protocol = RC_PROTO_NEC32;
362 } else if ((address ^ not_address) != 0xff) {
363 /* Extended NEC */
364 scancode = address << 16 |
365 not_address << 8 |
366 command;
367 *protocol = RC_PROTO_NECX;
368 } else {
369 /* Normal NEC */
370 scancode = address << 8 | command;
371 *protocol = RC_PROTO_NEC;
372 }
373
374 return scancode;
375 }
376
377 #endif /* _RC_CORE */
378