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 enum rc_driver_type {
  33         RC_DRIVER_SCANCODE = 0, /* Driver or hardware generates a scancode */
  34         RC_DRIVER_IR_RAW,       /* Needs a Infra-Red pulse/space decoder */
  35 };
  36
  37 /**
  38  * struct rc_scancode_filter - Filter scan codes.
  39  * @data:       Scancode data to match.
  40  * @mask:       Mask of bits of scancode to compare.
  41  */
  42 struct rc_scancode_filter {
  43         u32 data;
  44         u32 mask;
  45 };
  46
  47 /**
  48  * enum rc_filter_type - Filter type constants.
  49  * @RC_FILTER_NORMAL:   Filter for normal operation.
  50  * @RC_FILTER_WAKEUP:   Filter for waking from suspend.
  51  * @RC_FILTER_MAX:      Number of filter types.
  52  */
  53 enum rc_filter_type {
  54         RC_FILTER_NORMAL = 0,
  55         RC_FILTER_WAKEUP,
  56
  57         RC_FILTER_MAX
  58 };
  59
  60 /**
  61  * struct rc_dev - represents a remote control device
  62  * @dev: driver model's view of this device
  63  * @sysfs_groups: sysfs attribute groups
  64  * @input_name: name of the input child device
  65  * @input_phys: physical path to the input child device
  66  * @input_id: id of the input child device (struct input_id)
  67  * @driver_name: name of the hardware driver which registered this device
  68  * @map_name: name of the default keymap
  69  * @rc_map: current scan/key table
  70  * @lock: used to ensure we've filled in all protocol details before
  71  *      anyone can call show_protocols or store_protocols
  72  * @devno: unique remote control device number
  73  * @raw: additional data for raw pulse/space devices
  74  * @input_dev: the input child device used to communicate events to userspace
  75  * @driver_type: specifies if protocol decoding is done in hardware or software
  76  * @idle: used to keep track of RX state
  77  * @encode_wakeup: wakeup filtering uses IR encode API, therefore the allowed
  78  *      wakeup protocols is the set of all raw encoders
  79  * @allowed_protocols: bitmask with the supported RC_BIT_* protocols
  80  * @enabled_protocols: bitmask with the enabled RC_BIT_* protocols
  81  * @allowed_wakeup_protocols: bitmask with the supported RC_BIT_* wakeup protocols
  82  * @enabled_wakeup_protocols: bitmask with the enabled RC_BIT_* wakeup protocols
  83  * @scancode_filter: scancode filter
  84  * @scancode_wakeup_filter: scancode wakeup filters
  85  * @scancode_mask: some hardware decoders are not capable of providing the full
  86  *      scancode to the application. As this is a hardware limit, we can't do
  87  *      anything with it. Yet, as the same keycode table can be used with other
  88  *      devices, a mask is provided to allow its usage. Drivers should generally
  89  *      leave this field in blank
  90  * @users: number of current users of the device
  91  * @priv: driver-specific data
  92  * @keylock: protects the remaining members of the struct
  93  * @keypressed: whether a key is currently pressed
  94  * @keyup_jiffies: time (in jiffies) when the current keypress should be released
  95  * @timer_keyup: timer for releasing a keypress
  96  * @last_keycode: keycode of last keypress
  97  * @last_protocol: protocol of last keypress
  98  * @last_scancode: scancode of last keypress
  99  * @last_toggle: toggle value of last command
 100  * @timeout: optional time after which device stops sending data
 101  * @min_timeout: minimum timeout supported by device
 102  * @max_timeout: maximum timeout supported by device
 103  * @rx_resolution : resolution (in ns) of input sampler
 104  * @tx_resolution: resolution (in ns) of output sampler
 105  * @change_protocol: allow changing the protocol used on hardware decoders
 106  * @change_wakeup_protocol: allow changing the protocol used for wakeup
 107  *      filtering
 108  * @open: callback to allow drivers to enable polling/irq when IR input device
 109  *      is opened.
 110  * @close: callback to allow drivers to disable polling/irq when IR input device
 111  *      is opened.
 112  * @s_tx_mask: set transmitter mask (for devices with multiple tx outputs)
 113  * @s_tx_carrier: set transmit carrier frequency
 114  * @s_tx_duty_cycle: set transmit duty cycle (0% - 100%)
 115  * @s_rx_carrier: inform driver about carrier it is expected to handle
 116  * @tx_ir: transmit IR
 117  * @s_idle: enable/disable hardware idle mode, upon which,
 118  *      device doesn't interrupt host until it sees IR pulses
 119  * @s_learning_mode: enable wide band receiver used for learning
 120  * @s_carrier_report: enable carrier reports
 121  * @s_filter: set the scancode filter
 122  * @s_wakeup_filter: set the wakeup scancode filter
 123  */
 124 struct rc_dev {
 125         struct device                   dev;
 126         const struct attribute_group    *sysfs_groups[5];
 127         const char                      *input_name;
 128         const char                      *input_phys;
 129         struct input_id                 input_id;
 130         char                            *driver_name;
 131         const char                      *map_name;
 132         struct rc_map                   rc_map;
 133         struct mutex                    lock;
 134         unsigned long                   devno;
 135         struct ir_raw_event_ctrl        *raw;
 136         struct input_dev                *input_dev;
 137         enum rc_driver_type             driver_type;
 138         bool                            idle;
 139         bool                            encode_wakeup;
 140         u64                             allowed_protocols;
 141         u64                             enabled_protocols;
 142         u64                             allowed_wakeup_protocols;
 143         u64                             enabled_wakeup_protocols;
 144         struct rc_scancode_filter       scancode_filter;
 145         struct rc_scancode_filter       scancode_wakeup_filter;
 146         u32                             scancode_mask;
 147         u32                             users;
 148         void                            *priv;
 149         spinlock_t                      keylock;
 150         bool                            keypressed;
 151         unsigned long                   keyup_jiffies;
 152         struct timer_list               timer_keyup;
 153         u32                             last_keycode;
 154         enum rc_type                    last_protocol;
 155         u32                             last_scancode;
 156         u8                              last_toggle;
 157         u32                             timeout;
 158         u32                             min_timeout;
 159         u32                             max_timeout;
 160         u32                             rx_resolution;
 161         u32                             tx_resolution;
 162         int                             (*change_protocol)(struct rc_dev *dev, u64 *rc_type);
 163         int                             (*change_wakeup_protocol)(struct rc_dev *dev, u64 *rc_type);
 164         int                             (*open)(struct rc_dev *dev);
 165         void                            (*close)(struct rc_dev *dev);
 166         int                             (*s_tx_mask)(struct rc_dev *dev, u32 mask);
 167         int                             (*s_tx_carrier)(struct rc_dev *dev, u32 carrier);
 168         int                             (*s_tx_duty_cycle)(struct rc_dev *dev, u32 duty_cycle);
 169         int                             (*s_rx_carrier_range)(struct rc_dev *dev, u32 min, u32 max);
 170         int                             (*tx_ir)(struct rc_dev *dev, unsigned *txbuf, unsigned n);
 171         void                            (*s_idle)(struct rc_dev *dev, bool enable);
 172         int                             (*s_learning_mode)(struct rc_dev *dev, int enable);
 173         int                             (*s_carrier_report) (struct rc_dev *dev, int enable);
 174         int                             (*s_filter)(struct rc_dev *dev,
 175                                                     struct rc_scancode_filter *filter);
 176         int                             (*s_wakeup_filter)(struct rc_dev *dev,
 177                                                            struct rc_scancode_filter *filter);
 178 };
 179
 180 #define to_rc_dev(d) container_of(d, struct rc_dev, dev)
 181
 182 /*
 183  * From rc-main.c
 184  * Those functions can be used on any type of Remote Controller. They
 185  * basically creates an input_dev and properly reports the device as a
 186  * Remote Controller, at sys/class/rc.
 187  */
 188
 189 struct rc_dev *rc_allocate_device(void);
 190 void rc_free_device(struct rc_dev *dev);
 191 int rc_register_device(struct rc_dev *dev);
 192 void rc_unregister_device(struct rc_dev *dev);
 193
 194 int rc_open(struct rc_dev *rdev);
 195 void rc_close(struct rc_dev *rdev);
 196
 197 void rc_repeat(struct rc_dev *dev);
 198 void rc_keydown(struct rc_dev *dev, enum rc_type protocol, u32 scancode, u8 toggle);
 199 void rc_keydown_notimeout(struct rc_dev *dev, enum rc_type protocol, u32 scancode, u8 toggle);
 200 void rc_keyup(struct rc_dev *dev);
 201 u32 rc_g_keycode_from_table(struct rc_dev *dev, u32 scancode);
 202
 203 /*
 204  * From rc-raw.c
 205  * The Raw interface is specific to InfraRed. It may be a good idea to
 206  * split it later into a separate header.
 207  */
 208
 209 enum raw_event_type {
 210         IR_SPACE        = (1 << 0),
 211         IR_PULSE        = (1 << 1),
 212         IR_START_EVENT  = (1 << 2),
 213         IR_STOP_EVENT   = (1 << 3),
 214 };
 215
 216 struct ir_raw_event {
 217         union {
 218                 u32             duration;
 219
 220                 struct {
 221                         u32     carrier;
 222                         u8      duty_cycle;
 223                 };
 224         };
 225
 226         unsigned                pulse:1;
 227         unsigned                reset:1;
 228         unsigned                timeout:1;
 229         unsigned                carrier_report:1;
 230 };
 231
 232 #define DEFINE_IR_RAW_EVENT(event) \
 233         struct ir_raw_event event = { \
 234                 { .duration = 0 } , \
 235                 .pulse = 0, \
 236                 .reset = 0, \
 237                 .timeout = 0, \
 238                 .carrier_report = 0 }
 239
 240 static inline void init_ir_raw_event(struct ir_raw_event *ev)
 241 {
 242         memset(ev, 0, sizeof(*ev));
 243 }
 244
 245 #define IR_MAX_DURATION         500000000       /* 500 ms */
 246 #define US_TO_NS(usec)          ((usec) * 1000)
 247 #define MS_TO_US(msec)          ((msec) * 1000)
 248 #define MS_TO_NS(msec)          ((msec) * 1000 * 1000)
 249 #define NS_TO_US(nsec)          DIV_ROUND_UP(nsec, 1000L)
 250
 251 void ir_raw_event_handle(struct rc_dev *dev);
 252 int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev);
 253 int ir_raw_event_store_edge(struct rc_dev *dev, enum raw_event_type type);
 254 int ir_raw_event_store_with_filter(struct rc_dev *dev,
 255                                 struct ir_raw_event *ev);
 256 void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
 257 int ir_raw_encode_scancode(u64 protocols,
 258                            const struct rc_scancode_filter *scancode,
 259                            struct ir_raw_event *events, unsigned int max);
 260
 261 static inline void ir_raw_event_reset(struct rc_dev *dev)
 262 {
 263         DEFINE_IR_RAW_EVENT(ev);
 264         ev.reset = true;
 265
 266         ir_raw_event_store(dev, &ev);
 267         ir_raw_event_handle(dev);
 268 }
 269
 270 /* extract mask bits out of data and pack them into the result */
 271 static inline u32 ir_extract_bits(u32 data, u32 mask)
 272 {
 273         u32 vbit = 1, value = 0;
 274
 275         do {
 276                 if (mask & 1) {
 277                         if (data & 1)
 278                                 value |= vbit;
 279                         vbit <<= 1;
 280                 }
 281                 data >>= 1;
 282         } while (mask >>= 1);
 283
 284         return value;
 285 }
 286
 287 #endif /* _RC_CORE */