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 */ 27enum 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 */ 38struct 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 */ 49enum 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 */ 71struct 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_learning_mode: 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 */ 162struct 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_learning_mode)(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 */ 246struct 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 */ 255struct 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 */ 262void 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 */ 269int 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 */ 277int 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 */ 284void rc_unregister_device(struct rc_dev *dev); 285 286void rc_repeat(struct rc_dev *dev); 287void rc_keydown(struct rc_dev *dev, enum rc_proto protocol, u64 scancode, 288 u8 toggle); 289void rc_keydown_notimeout(struct rc_dev *dev, enum rc_proto protocol, 290 u64 scancode, u8 toggle); 291void rc_keyup(struct rc_dev *dev); 292u32 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 */ 299struct 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 317void ir_raw_event_handle(struct rc_dev *dev); 318int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev); 319int ir_raw_event_store_edge(struct rc_dev *dev, bool pulse); 320int ir_raw_event_store_with_filter(struct rc_dev *dev, 321 struct ir_raw_event *ev); 322int ir_raw_event_store_with_timeout(struct rc_dev *dev, 323 struct ir_raw_event *ev); 324void ir_raw_event_set_idle(struct rc_dev *dev, bool idle); 325int ir_raw_encode_scancode(enum rc_proto protocol, u32 scancode, 326 struct ir_raw_event *events, unsigned int max); 327int ir_raw_encode_carrier(enum rc_proto protocol); 328 329static inline void ir_raw_event_reset(struct rc_dev *dev) 330{ 331 ir_raw_event_store(dev, &((struct ir_raw_event) { .reset = true })); 332 dev->idle = true; 333 ir_raw_event_handle(dev); 334} 335 336/* extract mask bits out of data and pack them into the result */ 337static inline u32 ir_extract_bits(u32 data, u32 mask) 338{ 339 u32 vbit = 1, value = 0; 340 341 do { 342 if (mask & 1) { 343 if (data & 1) 344 value |= vbit; 345 vbit <<= 1; 346 } 347 data >>= 1; 348 } while (mask >>= 1); 349 350 return value; 351} 352 353/* Get NEC scancode and protocol type from address and command bytes */ 354static inline u32 ir_nec_bytes_to_scancode(u8 address, u8 not_address, 355 u8 command, u8 not_command, 356 enum rc_proto *protocol) 357{ 358 u32 scancode; 359 360 if ((command ^ not_command) != 0xff) { 361 /* NEC transport, but modified protocol, used by at 362 * least Apple and TiVo remotes 363 */ 364 scancode = not_address << 24 | 365 address << 16 | 366 not_command << 8 | 367 command; 368 *protocol = RC_PROTO_NEC32; 369 } else if ((address ^ not_address) != 0xff) { 370 /* Extended NEC */ 371 scancode = address << 16 | 372 not_address << 8 | 373 command; 374 *protocol = RC_PROTO_NECX; 375 } else { 376 /* Normal NEC */ 377 scancode = address << 8 | command; 378 *protocol = RC_PROTO_NEC; 379 } 380 381 return scancode; 382} 383 384#endif /* _RC_CORE */ 385