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