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); 321 322 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 */ 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 */ 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