include/media/rc-core.h

   1 /*
   2  * Remote Controller core header
   3  *
   4  * Copyright (C) 2009-2010 by Mauro Carvalho Chehab
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation version 2 of the License.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  */
  15
  16 #ifndef _RC_CORE
  17 #define _RC_CORE
  18
  19 #include <linux/spinlock.h>
  20 #include <linux/cdev.h>
  21 #include <linux/kfifo.h>
  22 #include <linux/time.h>
  23 #include <linux/timer.h>
  24 #include <media/rc-map.h>
  25
  26 extern int rc_core_debug;
  27 #define IR_dprintk(level, fmt, ...)                             \
  28 do {                                                            \
  29         if (rc_core_debug >= level)                             \
  30                 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__);  \
  31 } while (0)
  32
  33 /**
  34  * enum rc_driver_type - type of the RC driver.
  35  *
  36  * @RC_DRIVER_SCANCODE:  Driver or hardware generates a scancode.
  37  * @RC_DRIVER_IR_RAW:    Driver or hardware generates pulse/space sequences.
  38  *                       It needs a Infra-Red pulse/space decoder
  39  * @RC_DRIVER_IR_RAW_TX: Device transmitter only,
  40  *                       driver requires pulse/space data sequence.
  41  */
  42 enum rc_driver_type {
  43         RC_DRIVER_SCANCODE = 0,
  44         RC_DRIVER_IR_RAW,
  45         RC_DRIVER_IR_RAW_TX,
  46 };
  47
  48 /**
  49  * struct rc_scancode_filter - Filter scan codes.
  50  * @data:       Scancode data to match.
  51  * @mask:       Mask of bits of scancode to compare.
  52  */
  53 struct rc_scancode_filter {
  54         u32 data;
  55         u32 mask;
  56 };
  57
  58 /**
  59  * enum rc_filter_type - Filter type constants.
  60  * @RC_FILTER_NORMAL:   Filter for normal operation.
  61  * @RC_FILTER_WAKEUP:   Filter for waking from suspend.
  62  * @RC_FILTER_MAX:      Number of filter types.
  63  */
  64 enum rc_filter_type {
  65         RC_FILTER_NORMAL = 0,
  66         RC_FILTER_WAKEUP,
  67
  68         RC_FILTER_MAX
  69 };
  70
  71 /**
  72  * struct lirc_fh - represents an open lirc file
  73  * @list: list of open file handles
  74  * @rc: rcdev for this lirc chardev
  75  * @carrier_low: when setting the carrier range, first the low end must be
  76  *      set with an ioctl and then the high end with another ioctl
  77  * @send_timeout_reports: report timeouts in lirc raw IR.
  78  * @rawir: queue for incoming raw IR
  79  * @scancodes: queue for incoming decoded scancodes
  80  * @wait_poll: poll struct for lirc device
  81  * @send_mode: lirc mode for sending, either LIRC_MODE_SCANCODE or
  82  *      LIRC_MODE_PULSE
  83  * @rec_mode: lirc mode for receiving, either LIRC_MODE_SCANCODE or
  84  *      LIRC_MODE_MODE2
  85  */
  86 struct lirc_fh {
  87         struct list_head list;
  88         struct rc_dev *rc;
  89         int                             carrier_low;
  90         bool                            send_timeout_reports;
  91         DECLARE_KFIFO_PTR(rawir, unsigned int);
  92         DECLARE_KFIFO_PTR(scancodes, struct lirc_scancode);
  93         wait_queue_head_t               wait_poll;
  94         u8                              send_mode;
  95         u8                              rec_mode;
  96 };
  97
  98 /**
  99  * struct rc_dev - represents a remote control device
 100  * @dev: driver model's view of this device
 101  * @managed_alloc: devm_rc_allocate_device was used to create rc_dev
 102  * @sysfs_groups: sysfs attribute groups
 103  * @device_name: name of the rc child device
 104  * @input_phys: physical path to the input child device
 105  * @input_id: id of the input child device (struct input_id)
 106  * @driver_name: name of the hardware driver which registered this device
 107  * @map_name: name of the default keymap
 108  * @rc_map: current scan/key table
 109  * @lock: used to ensure we've filled in all protocol details before
 110  *      anyone can call show_protocols or store_protocols
 111  * @minor: unique minor remote control device number
 112  * @raw: additional data for raw pulse/space devices
 113  * @input_dev: the input child device used to communicate events to userspace
 114  * @driver_type: specifies if protocol decoding is done in hardware or software
 115  * @idle: used to keep track of RX state
 116  * @encode_wakeup: wakeup filtering uses IR encode API, therefore the allowed
 117  *      wakeup protocols is the set of all raw encoders
 118  * @allowed_protocols: bitmask with the supported RC_PROTO_BIT_* protocols
 119  * @enabled_protocols: bitmask with the enabled RC_PROTO_BIT_* protocols
 120  * @allowed_wakeup_protocols: bitmask with the supported RC_PROTO_BIT_* wakeup
 121  *      protocols
 122  * @wakeup_protocol: the enabled RC_PROTO_* wakeup protocol or
 123  *      RC_PROTO_UNKNOWN if disabled.
 124  * @scancode_filter: scancode filter
 125  * @scancode_wakeup_filter: scancode wakeup filters
 126  * @scancode_mask: some hardware decoders are not capable of providing the full
 127  *      scancode to the application. As this is a hardware limit, we can't do
 128  *      anything with it. Yet, as the same keycode table can be used with other
 129  *      devices, a mask is provided to allow its usage. Drivers should generally
 130  *      leave this field in blank
 131  * @users: number of current users of the device
 132  * @priv: driver-specific data
 133  * @keylock: protects the remaining members of the struct
 134  * @keypressed: whether a key is currently pressed
 135  * @keyup_jiffies: time (in jiffies) when the current keypress should be released
 136  * @timer_keyup: timer for releasing a keypress
 137  * @timer_repeat: timer for autorepeat events. This is needed for CEC, which
 138  *      has non-standard repeats.
 139  * @last_keycode: keycode of last keypress
 140  * @last_protocol: protocol of last keypress
 141  * @last_scancode: scancode of last keypress
 142  * @last_toggle: toggle value of last command
 143  * @timeout: optional time after which device stops sending data
 144  * @min_timeout: minimum timeout supported by device
 145  * @max_timeout: maximum timeout supported by device
 146  * @rx_resolution : resolution (in ns) of input sampler
 147  * @tx_resolution: resolution (in ns) of output sampler
 148  * @lirc_dev: lirc device
 149  * @lirc_cdev: lirc char cdev
 150  * @gap_start: time when gap starts
 151  * @gap_duration: duration of initial gap
 152  * @gap: true if we're in a gap
 153  * @lirc_fh_lock: protects lirc_fh list
 154  * @lirc_fh: list of open files
 155  * @registered: set to true by rc_register_device(), false by
 156  *      rc_unregister_device
 157  * @change_protocol: allow changing the protocol used on hardware decoders
 158  * @open: callback to allow drivers to enable polling/irq when IR input device
 159  *      is opened.
 160  * @close: callback to allow drivers to disable polling/irq when IR input device
 161  *      is opened.
 162  * @s_tx_mask: set transmitter mask (for devices with multiple tx outputs)
 163  * @s_tx_carrier: set transmit carrier frequency
 164  * @s_tx_duty_cycle: set transmit duty cycle (0% - 100%)
 165  * @s_rx_carrier_range: inform driver about carrier it is expected to handle
 166  * @tx_ir: transmit IR
 167  * @s_idle: enable/disable hardware idle mode, upon which,
 168  *      device doesn't interrupt host until it sees IR pulses
 169  * @s_learning_mode: enable wide band receiver used for learning
 170  * @s_carrier_report: enable carrier reports
 171  * @s_filter: set the scancode filter
 172  * @s_wakeup_filter: set the wakeup scancode filter. If the mask is zero
 173  *      then wakeup should be disabled. wakeup_protocol will be set to
 174  *      a valid protocol if mask is nonzero.
 175  * @s_timeout: set hardware timeout in ns
 176  */
 177 struct rc_dev {
 178         struct device                   dev;
 179         bool                            managed_alloc;
 180         const struct attribute_group    *sysfs_groups[5];
 181         const char                      *device_name;
 182         const char                      *input_phys;
 183         struct input_id                 input_id;
 184         const char                      *driver_name;
 185         const char                      *map_name;
 186         struct rc_map                   rc_map;
 187         struct mutex                    lock;
 188         unsigned int                    minor;
 189         struct ir_raw_event_ctrl        *raw;
 190         struct input_dev                *input_dev;
 191         enum rc_driver_type             driver_type;
 192         bool                            idle;
 193         bool                            encode_wakeup;
 194         u64                             allowed_protocols;
 195         u64                             enabled_protocols;
 196         u64                             allowed_wakeup_protocols;
 197         enum rc_proto                   wakeup_protocol;
 198         struct rc_scancode_filter       scancode_filter;
 199         struct rc_scancode_filter       scancode_wakeup_filter;
 200         u32                             scancode_mask;
 201         u32                             users;
 202         void                            *priv;
 203         spinlock_t                      keylock;
 204         bool                            keypressed;
 205         unsigned long                   keyup_jiffies;
 206         struct timer_list               timer_keyup;
 207         struct timer_list               timer_repeat;
 208         u32                             last_keycode;
 209         enum rc_proto                   last_protocol;
 210         u32                             last_scancode;
 211         u8                              last_toggle;
 212         u32                             timeout;
 213         u32                             min_timeout;
 214         u32                             max_timeout;
 215         u32                             rx_resolution;
 216         u32                             tx_resolution;
 217 #ifdef CONFIG_LIRC
 218         struct device                   lirc_dev;
 219         struct cdev                     lirc_cdev;
 220         ktime_t                         gap_start;
 221         u64                             gap_duration;
 222         bool                            gap;
 223         spinlock_t                      lirc_fh_lock;
 224         struct list_head                lirc_fh;
 225 #endif
 226         bool                            registered;
 227         int                             (*change_protocol)(struct rc_dev *dev, u64 *rc_proto);
 228         int                             (*open)(struct rc_dev *dev);
 229         void                            (*close)(struct rc_dev *dev);
 230         int                             (*s_tx_mask)(struct rc_dev *dev, u32 mask);
 231         int                             (*s_tx_carrier)(struct rc_dev *dev, u32 carrier);
 232         int                             (*s_tx_duty_cycle)(struct rc_dev *dev, u32 duty_cycle);
 233         int                             (*s_rx_carrier_range)(struct rc_dev *dev, u32 min, u32 max);
 234         int                             (*tx_ir)(struct rc_dev *dev, unsigned *txbuf, unsigned n);
 235         void                            (*s_idle)(struct rc_dev *dev, bool enable);
 236         int                             (*s_learning_mode)(struct rc_dev *dev, int enable);
 237         int                             (*s_carrier_report) (struct rc_dev *dev, int enable);
 238         int                             (*s_filter)(struct rc_dev *dev,
 239                                                     struct rc_scancode_filter *filter);
 240         int                             (*s_wakeup_filter)(struct rc_dev *dev,
 241                                                            struct rc_scancode_filter *filter);
 242         int                             (*s_timeout)(struct rc_dev *dev,
 243                                                      unsigned int timeout);
 244 };
 245
 246 #define to_rc_dev(d) container_of(d, struct rc_dev, dev)
 247
 248 /*
 249  * From rc-main.c
 250  * Those functions can be used on any type of Remote Controller. They
 251  * basically creates an input_dev and properly reports the device as a
 252  * Remote Controller, at sys/class/rc.
 253  */
 254
 255 /**
 256  * rc_allocate_device - Allocates a RC device
 257  *
 258  * @rc_driver_type: specifies the type of the RC output to be allocated
 259  * returns a pointer to struct rc_dev.
 260  */
 261 struct rc_dev *rc_allocate_device(enum rc_driver_type);
 262
 263 /**
 264  * devm_rc_allocate_device - Managed RC device allocation
 265  *
 266  * @dev: pointer to struct device
 267  * @rc_driver_type: specifies the type of the RC output to be allocated
 268  * returns a pointer to struct rc_dev.
 269  */
 270 struct rc_dev *devm_rc_allocate_device(struct device *dev, enum rc_driver_type);
 271
 272 /**
 273  * rc_free_device - Frees a RC device
 274  *
 275  * @dev: pointer to struct rc_dev.
 276  */
 277 void rc_free_device(struct rc_dev *dev);
 278
 279 /**
 280  * rc_register_device - Registers a RC device
 281  *
 282  * @dev: pointer to struct rc_dev.
 283  */
 284 int rc_register_device(struct rc_dev *dev);
 285
 286 /**
 287  * devm_rc_register_device - Manageded registering of a RC device
 288  *
 289  * @parent: pointer to struct device.
 290  * @dev: pointer to struct rc_dev.
 291  */
 292 int devm_rc_register_device(struct device *parent, struct rc_dev *dev);
 293
 294 /**
 295  * rc_unregister_device - Unregisters a RC device
 296  *
 297  * @dev: pointer to struct rc_dev.
 298  */
 299 void rc_unregister_device(struct rc_dev *dev);
 300
 301 void rc_repeat(struct rc_dev *dev);
 302 void rc_keydown(struct rc_dev *dev, enum rc_proto protocol, u32 scancode,
 303                 u8 toggle);
 304 void rc_keydown_notimeout(struct rc_dev *dev, enum rc_proto protocol,
 305                           u32 scancode, u8 toggle);
 306 void rc_keyup(struct rc_dev *dev);
 307 u32 rc_g_keycode_from_table(struct rc_dev *dev, u32 scancode);
 308
 309 /*
 310  * From rc-raw.c
 311  * The Raw interface is specific to InfraRed. It may be a good idea to
 312  * split it later into a separate header.
 313  */
 314 struct ir_raw_event {
 315         union {
 316                 u32             duration;
 317                 u32             carrier;
 318         };
 319         u8                      duty_cycle;
 320
 321         unsigned                pulse:1;
 322         unsigned                reset:1;
 323         unsigned                timeout:1;
 324         unsigned                carrier_report:1;
 325 };
 326
 327 #define DEFINE_IR_RAW_EVENT(event) struct ir_raw_event event = {}
 328
 329 static inline void init_ir_raw_event(struct ir_raw_event *ev)
 330 {
 331         memset(ev, 0, sizeof(*ev));
 332 }
 333
 334 #define IR_DEFAULT_TIMEOUT      MS_TO_NS(125)
 335 #define IR_MAX_DURATION         500000000       /* 500 ms */
 336 #define US_TO_NS(usec)          ((usec) * 1000)
 337 #define MS_TO_US(msec)          ((msec) * 1000)
 338 #define MS_TO_NS(msec)          ((msec) * 1000 * 1000)
 339
 340 void ir_raw_event_handle(struct rc_dev *dev);
 341 int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev);
 342 int ir_raw_event_store_edge(struct rc_dev *dev, bool pulse);
 343 int ir_raw_event_store_with_filter(struct rc_dev *dev,
 344                                 struct ir_raw_event *ev);
 345 void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
 346 int ir_raw_encode_scancode(enum rc_proto protocol, u32 scancode,
 347                            struct ir_raw_event *events, unsigned int max);
 348 int ir_raw_encode_carrier(enum rc_proto protocol);
 349
 350 static inline void ir_raw_event_reset(struct rc_dev *dev)
 351 {
 352         struct ir_raw_event ev = { .reset = true };
 353
 354         ir_raw_event_store(dev, &ev);
 355         ir_raw_event_handle(dev);
 356 }
 357
 358 /* extract mask bits out of data and pack them into the result */
 359 static inline u32 ir_extract_bits(u32 data, u32 mask)
 360 {
 361         u32 vbit = 1, value = 0;
 362
 363         do {
 364                 if (mask & 1) {
 365                         if (data & 1)
 366                                 value |= vbit;
 367                         vbit <<= 1;
 368                 }
 369                 data >>= 1;
 370         } while (mask >>= 1);
 371
 372         return value;
 373 }
 374
 375 /* Get NEC scancode and protocol type from address and command bytes */
 376 static inline u32 ir_nec_bytes_to_scancode(u8 address, u8 not_address,
 377                                            u8 command, u8 not_command,
 378                                            enum rc_proto *protocol)
 379 {
 380         u32 scancode;
 381
 382         if ((command ^ not_command) != 0xff) {
 383                 /* NEC transport, but modified protocol, used by at
 384                  * least Apple and TiVo remotes
 385                  */
 386                 scancode = not_address << 24 |
 387                         address     << 16 |
 388                         not_command <<  8 |
 389                         command;
 390                 *protocol = RC_PROTO_NEC32;
 391         } else if ((address ^ not_address) != 0xff) {
 392                 /* Extended NEC */
 393                 scancode = address     << 16 |
 394                            not_address <<  8 |
 395                            command;
 396                 *protocol = RC_PROTO_NECX;
 397         } else {
 398                 /* Normal NEC */
 399                 scancode = address << 8 | command;
 400                 *protocol = RC_PROTO_NEC;
 401         }
 402
 403         return scancode;
 404 }
 405
 406 #endif /* _RC_CORE */