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  * @send_timeout_reports: report timeouts in lirc raw IR.
63  * @rawir: queue for incoming raw IR
64  * @scancodes: queue for incoming decoded scancodes
65  * @wait_poll: poll struct for lirc device
66  * @send_mode: lirc mode for sending, either LIRC_MODE_SCANCODE or
67  *	LIRC_MODE_PULSE
68  * @rec_mode: lirc mode for receiving, either LIRC_MODE_SCANCODE or
69  *	LIRC_MODE_MODE2
70  */
71 struct lirc_fh {
72 	struct list_head list;
73 	struct rc_dev *rc;
74 	int				carrier_low;
75 	bool				send_timeout_reports;
76 	DECLARE_KFIFO_PTR(rawir, unsigned int);
77 	DECLARE_KFIFO_PTR(scancodes, struct lirc_scancode);
78 	wait_queue_head_t		wait_poll;
79 	u8				send_mode;
80 	u8				rec_mode;
81 };
82 
83 /**
84  * struct rc_dev - represents a remote control device
85  * @dev: driver model's view of this device
86  * @managed_alloc: devm_rc_allocate_device was used to create rc_dev
87  * @sysfs_groups: sysfs attribute groups
88  * @device_name: name of the rc child device
89  * @input_phys: physical path to the input child device
90  * @input_id: id of the input child device (struct input_id)
91  * @driver_name: name of the hardware driver which registered this device
92  * @map_name: name of the default keymap
93  * @rc_map: current scan/key table
94  * @lock: used to ensure we've filled in all protocol details before
95  *	anyone can call show_protocols or store_protocols
96  * @minor: unique minor remote control device number
97  * @raw: additional data for raw pulse/space devices
98  * @input_dev: the input child device used to communicate events to userspace
99  * @driver_type: specifies if protocol decoding is done in hardware or software
100  * @idle: used to keep track of RX state
101  * @encode_wakeup: wakeup filtering uses IR encode API, therefore the allowed
102  *	wakeup protocols is the set of all raw encoders
103  * @allowed_protocols: bitmask with the supported RC_PROTO_BIT_* protocols
104  * @enabled_protocols: bitmask with the enabled RC_PROTO_BIT_* protocols
105  * @allowed_wakeup_protocols: bitmask with the supported RC_PROTO_BIT_* wakeup
106  *	protocols
107  * @wakeup_protocol: the enabled RC_PROTO_* wakeup protocol or
108  *	RC_PROTO_UNKNOWN if disabled.
109  * @scancode_filter: scancode filter
110  * @scancode_wakeup_filter: scancode wakeup filters
111  * @scancode_mask: some hardware decoders are not capable of providing the full
112  *	scancode to the application. As this is a hardware limit, we can't do
113  *	anything with it. Yet, as the same keycode table can be used with other
114  *	devices, a mask is provided to allow its usage. Drivers should generally
115  *	leave this field in blank
116  * @users: number of current users of the device
117  * @priv: driver-specific data
118  * @keylock: protects the remaining members of the struct
119  * @keypressed: whether a key is currently pressed
120  * @keyup_jiffies: time (in jiffies) when the current keypress should be released
121  * @timer_keyup: timer for releasing a keypress
122  * @timer_repeat: timer for autorepeat events. This is needed for CEC, which
123  *	has non-standard repeats.
124  * @last_keycode: keycode of last keypress
125  * @last_protocol: protocol of last keypress
126  * @last_scancode: scancode of last keypress
127  * @last_toggle: toggle value of last command
128  * @timeout: optional time after which device stops sending data
129  * @min_timeout: minimum timeout supported by device
130  * @max_timeout: maximum timeout supported by device
131  * @rx_resolution : resolution (in us) of input sampler
132  * @tx_resolution: resolution (in us) of output sampler
133  * @lirc_dev: lirc device
134  * @lirc_cdev: lirc char cdev
135  * @gap_start: time when gap starts
136  * @gap_duration: duration of initial gap
137  * @gap: true if we're in a gap
138  * @lirc_fh_lock: protects lirc_fh list
139  * @lirc_fh: list of open files
140  * @registered: set to true by rc_register_device(), false by
141  *	rc_unregister_device
142  * @change_protocol: allow changing the protocol used on hardware decoders
143  * @open: callback to allow drivers to enable polling/irq when IR input device
144  *	is opened.
145  * @close: callback to allow drivers to disable polling/irq when IR input device
146  *	is opened.
147  * @s_tx_mask: set transmitter mask (for devices with multiple tx outputs)
148  * @s_tx_carrier: set transmit carrier frequency
149  * @s_tx_duty_cycle: set transmit duty cycle (0% - 100%)
150  * @s_rx_carrier_range: inform driver about carrier it is expected to handle
151  * @tx_ir: transmit IR
152  * @s_idle: enable/disable hardware idle mode, upon which,
153  *	device doesn't interrupt host until it sees IR pulses
154  * @s_wideband_receiver: enable wide band receiver used for learning
155  * @s_carrier_report: enable carrier reports
156  * @s_filter: set the scancode filter
157  * @s_wakeup_filter: set the wakeup scancode filter. If the mask is zero
158  *	then wakeup should be disabled. wakeup_protocol will be set to
159  *	a valid protocol if mask is nonzero.
160  * @s_timeout: set hardware timeout in us
161  */
162 struct rc_dev {
163 	struct device			dev;
164 	bool				managed_alloc;
165 	const struct attribute_group	*sysfs_groups[5];
166 	const char			*device_name;
167 	const char			*input_phys;
168 	struct input_id			input_id;
169 	const char			*driver_name;
170 	const char			*map_name;
171 	struct rc_map			rc_map;
172 	struct mutex			lock;
173 	unsigned int			minor;
174 	struct ir_raw_event_ctrl	*raw;
175 	struct input_dev		*input_dev;
176 	enum rc_driver_type		driver_type;
177 	bool				idle;
178 	bool				encode_wakeup;
179 	u64				allowed_protocols;
180 	u64				enabled_protocols;
181 	u64				allowed_wakeup_protocols;
182 	enum rc_proto			wakeup_protocol;
183 	struct rc_scancode_filter	scancode_filter;
184 	struct rc_scancode_filter	scancode_wakeup_filter;
185 	u32				scancode_mask;
186 	u32				users;
187 	void				*priv;
188 	spinlock_t			keylock;
189 	bool				keypressed;
190 	unsigned long			keyup_jiffies;
191 	struct timer_list		timer_keyup;
192 	struct timer_list		timer_repeat;
193 	u32				last_keycode;
194 	enum rc_proto			last_protocol;
195 	u64				last_scancode;
196 	u8				last_toggle;
197 	u32				timeout;
198 	u32				min_timeout;
199 	u32				max_timeout;
200 	u32				rx_resolution;
201 	u32				tx_resolution;
202 #ifdef CONFIG_LIRC
203 	struct device			lirc_dev;
204 	struct cdev			lirc_cdev;
205 	ktime_t				gap_start;
206 	u64				gap_duration;
207 	bool				gap;
208 	spinlock_t			lirc_fh_lock;
209 	struct list_head		lirc_fh;
210 #endif
211 	bool				registered;
212 	int				(*change_protocol)(struct rc_dev *dev, u64 *rc_proto);
213 	int				(*open)(struct rc_dev *dev);
214 	void				(*close)(struct rc_dev *dev);
215 	int				(*s_tx_mask)(struct rc_dev *dev, u32 mask);
216 	int				(*s_tx_carrier)(struct rc_dev *dev, u32 carrier);
217 	int				(*s_tx_duty_cycle)(struct rc_dev *dev, u32 duty_cycle);
218 	int				(*s_rx_carrier_range)(struct rc_dev *dev, u32 min, u32 max);
219 	int				(*tx_ir)(struct rc_dev *dev, unsigned *txbuf, unsigned n);
220 	void				(*s_idle)(struct rc_dev *dev, bool enable);
221 	int				(*s_wideband_receiver)(struct rc_dev *dev, int enable);
222 	int				(*s_carrier_report) (struct rc_dev *dev, int enable);
223 	int				(*s_filter)(struct rc_dev *dev,
224 						    struct rc_scancode_filter *filter);
225 	int				(*s_wakeup_filter)(struct rc_dev *dev,
226 							   struct rc_scancode_filter *filter);
227 	int				(*s_timeout)(struct rc_dev *dev,
228 						     unsigned int timeout);
229 };
230 
231 #define to_rc_dev(d) container_of(d, struct rc_dev, dev)
232 
233 /*
234  * From rc-main.c
235  * Those functions can be used on any type of Remote Controller. They
236  * basically creates an input_dev and properly reports the device as a
237  * Remote Controller, at sys/class/rc.
238  */
239 
240 /**
241  * rc_allocate_device - Allocates a RC device
242  *
243  * @rc_driver_type: specifies the type of the RC output to be allocated
244  * returns a pointer to struct rc_dev.
245  */
246 struct rc_dev *rc_allocate_device(enum rc_driver_type);
247 
248 /**
249  * devm_rc_allocate_device - Managed RC device allocation
250  *
251  * @dev: pointer to struct device
252  * @rc_driver_type: specifies the type of the RC output to be allocated
253  * returns a pointer to struct rc_dev.
254  */
255 struct rc_dev *devm_rc_allocate_device(struct device *dev, enum rc_driver_type);
256 
257 /**
258  * rc_free_device - Frees a RC device
259  *
260  * @dev: pointer to struct rc_dev.
261  */
262 void rc_free_device(struct rc_dev *dev);
263 
264 /**
265  * rc_register_device - Registers a RC device
266  *
267  * @dev: pointer to struct rc_dev.
268  */
269 int rc_register_device(struct rc_dev *dev);
270 
271 /**
272  * devm_rc_register_device - Manageded registering of a RC device
273  *
274  * @parent: pointer to struct device.
275  * @dev: pointer to struct rc_dev.
276  */
277 int devm_rc_register_device(struct device *parent, struct rc_dev *dev);
278 
279 /**
280  * rc_unregister_device - Unregisters a RC device
281  *
282  * @dev: pointer to struct rc_dev.
283  */
284 void rc_unregister_device(struct rc_dev *dev);
285 
286 void rc_repeat(struct rc_dev *dev);
287 void rc_keydown(struct rc_dev *dev, enum rc_proto protocol, u64 scancode,
288 		u8 toggle);
289 void rc_keydown_notimeout(struct rc_dev *dev, enum rc_proto protocol,
290 			  u64 scancode, u8 toggle);
291 void rc_keyup(struct rc_dev *dev);
292 u32 rc_g_keycode_from_table(struct rc_dev *dev, u64 scancode);
293 
294 /*
295  * From rc-raw.c
296  * The Raw interface is specific to InfraRed. It may be a good idea to
297  * split it later into a separate header.
298  */
299 struct ir_raw_event {
300 	union {
301 		u32             duration;
302 		u32             carrier;
303 	};
304 	u8                      duty_cycle;
305 
306 	unsigned                pulse:1;
307 	unsigned                reset:1;
308 	unsigned                timeout:1;
309 	unsigned                carrier_report:1;
310 };
311 
312 #define US_TO_NS(usec)		((usec) * 1000)
313 #define MS_TO_US(msec)		((msec) * 1000)
314 #define IR_MAX_DURATION		MS_TO_US(500)
315 #define IR_DEFAULT_TIMEOUT	MS_TO_US(125)
316 #define IR_MAX_TIMEOUT		LIRC_VALUE_MASK
317 
318 void ir_raw_event_handle(struct rc_dev *dev);
319 int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev);
320 int ir_raw_event_store_edge(struct rc_dev *dev, bool pulse);
321 int ir_raw_event_store_with_filter(struct rc_dev *dev,
322 				   struct ir_raw_event *ev);
323 int ir_raw_event_store_with_timeout(struct rc_dev *dev,
324 				    struct ir_raw_event *ev);
325 void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
326 int ir_raw_encode_scancode(enum rc_proto protocol, u32 scancode,
327 			   struct ir_raw_event *events, unsigned int max);
328 int ir_raw_encode_carrier(enum rc_proto protocol);
329 
ir_raw_event_reset(struct rc_dev * dev)330 static inline void ir_raw_event_reset(struct rc_dev *dev)
331 {
332 	ir_raw_event_store(dev, &((struct ir_raw_event) { .reset = true }));
333 	dev->idle = true;
334 	ir_raw_event_handle(dev);
335 }
336 
337 /* extract mask bits out of data and pack them into the result */
ir_extract_bits(u32 data,u32 mask)338 static inline u32 ir_extract_bits(u32 data, u32 mask)
339 {
340 	u32 vbit = 1, value = 0;
341 
342 	do {
343 		if (mask & 1) {
344 			if (data & 1)
345 				value |= vbit;
346 			vbit <<= 1;
347 		}
348 		data >>= 1;
349 	} while (mask >>= 1);
350 
351 	return value;
352 }
353 
354 /* 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)355 static inline u32 ir_nec_bytes_to_scancode(u8 address, u8 not_address,
356 					   u8 command, u8 not_command,
357 					   enum rc_proto *protocol)
358 {
359 	u32 scancode;
360 
361 	if ((command ^ not_command) != 0xff) {
362 		/* NEC transport, but modified protocol, used by at
363 		 * least Apple and TiVo remotes
364 		 */
365 		scancode = not_address << 24 |
366 			address     << 16 |
367 			not_command <<  8 |
368 			command;
369 		*protocol = RC_PROTO_NEC32;
370 	} else if ((address ^ not_address) != 0xff) {
371 		/* Extended NEC */
372 		scancode = address     << 16 |
373 			   not_address <<  8 |
374 			   command;
375 		*protocol = RC_PROTO_NECX;
376 	} else {
377 		/* Normal NEC */
378 		scancode = address << 8 | command;
379 		*protocol = RC_PROTO_NEC;
380 	}
381 
382 	return scancode;
383 }
384 
385 #endif /* _RC_CORE */
386