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                 pr_debug("%s: " fmt, __func__, ##__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  * @input_name: name of the input child device
  64  * @input_phys: physical path to the input child device
  65  * @input_id: id of the input child device (struct input_id)
  66  * @driver_name: name of the hardware driver which registered this device
  67  * @map_name: name of the default keymap
  68  * @rc_map: current scan/key table
  69  * @lock: used to ensure we've filled in all protocol details before
  70  *      anyone can call show_protocols or store_protocols
  71  * @devno: unique remote control device number
  72  * @raw: additional data for raw pulse/space devices
  73  * @input_dev: the input child device used to communicate events to userspace
  74  * @driver_type: specifies if protocol decoding is done in hardware or software
  75  * @idle: used to keep track of RX state
  76  * @allowed_protos: bitmask with the supported RC_BIT_* protocols
  77  * @enabled_protocols: bitmask with the enabled RC_BIT_* protocols
  78  * @scanmask: some hardware decoders are not capable of providing the full
  79  *      scancode to the application. As this is a hardware limit, we can't do
  80  *      anything with it. Yet, as the same keycode table can be used with other
  81  *      devices, a mask is provided to allow its usage. Drivers should generally
  82  *      leave this field in blank
  83  * @priv: driver-specific data
  84  * @keylock: protects the remaining members of the struct
  85  * @keypressed: whether a key is currently pressed
  86  * @keyup_jiffies: time (in jiffies) when the current keypress should be released
  87  * @timer_keyup: timer for releasing a keypress
  88  * @last_keycode: keycode of last keypress
  89  * @last_scancode: scancode of last keypress
  90  * @last_toggle: toggle value of last command
  91  * @timeout: optional time after which device stops sending data
  92  * @min_timeout: minimum timeout supported by device
  93  * @max_timeout: maximum timeout supported by device
  94  * @rx_resolution : resolution (in ns) of input sampler
  95  * @tx_resolution: resolution (in ns) of output sampler
  96  * @scancode_filters: scancode filters (indexed by enum rc_filter_type)
  97  * @change_protocol: allow changing the protocol used on hardware decoders
  98  * @open: callback to allow drivers to enable polling/irq when IR input device
  99  *      is opened.
 100  * @close: callback to allow drivers to disable polling/irq when IR input device
 101  *      is opened.
 102  * @s_tx_mask: set transmitter mask (for devices with multiple tx outputs)
 103  * @s_tx_carrier: set transmit carrier frequency
 104  * @s_tx_duty_cycle: set transmit duty cycle (0% - 100%)
 105  * @s_rx_carrier: inform driver about carrier it is expected to handle
 106  * @tx_ir: transmit IR
 107  * @s_idle: enable/disable hardware idle mode, upon which,
 108  *      device doesn't interrupt host until it sees IR pulses
 109  * @s_learning_mode: enable wide band receiver used for learning
 110  * @s_carrier_report: enable carrier reports
 111  * @s_filter: set the scancode filter of a given type
 112  */
 113 struct rc_dev {
 114         struct device                   dev;
 115         const char                      *input_name;
 116         const char                      *input_phys;
 117         struct input_id                 input_id;
 118         char                            *driver_name;
 119         const char                      *map_name;
 120         struct rc_map                   rc_map;
 121         struct mutex                    lock;
 122         unsigned long                   devno;
 123         struct ir_raw_event_ctrl        *raw;
 124         struct input_dev                *input_dev;
 125         enum rc_driver_type             driver_type;
 126         bool                            idle;
 127         u64                             allowed_protos;
 128         u64                             enabled_protocols;
 129         u32                             users;
 130         u32                             scanmask;
 131         void                            *priv;
 132         spinlock_t                      keylock;
 133         bool                            keypressed;
 134         unsigned long                   keyup_jiffies;
 135         struct timer_list               timer_keyup;
 136         u32                             last_keycode;
 137         u32                             last_scancode;
 138         u8                              last_toggle;
 139         u32                             timeout;
 140         u32                             min_timeout;
 141         u32                             max_timeout;
 142         u32                             rx_resolution;
 143         u32                             tx_resolution;
 144         struct rc_scancode_filter       scancode_filters[RC_FILTER_MAX];
 145         int                             (*change_protocol)(struct rc_dev *dev, u64 *rc_type);
 146         int                             (*open)(struct rc_dev *dev);
 147         void                            (*close)(struct rc_dev *dev);
 148         int                             (*s_tx_mask)(struct rc_dev *dev, u32 mask);
 149         int                             (*s_tx_carrier)(struct rc_dev *dev, u32 carrier);
 150         int                             (*s_tx_duty_cycle)(struct rc_dev *dev, u32 duty_cycle);
 151         int                             (*s_rx_carrier_range)(struct rc_dev *dev, u32 min, u32 max);
 152         int                             (*tx_ir)(struct rc_dev *dev, unsigned *txbuf, unsigned n);
 153         void                            (*s_idle)(struct rc_dev *dev, bool enable);
 154         int                             (*s_learning_mode)(struct rc_dev *dev, int enable);
 155         int                             (*s_carrier_report) (struct rc_dev *dev, int enable);
 156         int                             (*s_filter)(struct rc_dev *dev,
 157                                                     enum rc_filter_type type,
 158                                                     struct rc_scancode_filter *filter);
 159 };
 160
 161 #define to_rc_dev(d) container_of(d, struct rc_dev, dev)
 162
 163 /*
 164  * From rc-main.c
 165  * Those functions can be used on any type of Remote Controller. They
 166  * basically creates an input_dev and properly reports the device as a
 167  * Remote Controller, at sys/class/rc.
 168  */
 169
 170 struct rc_dev *rc_allocate_device(void);
 171 void rc_free_device(struct rc_dev *dev);
 172 int rc_register_device(struct rc_dev *dev);
 173 void rc_unregister_device(struct rc_dev *dev);
 174
 175 int rc_open(struct rc_dev *rdev);
 176 void rc_close(struct rc_dev *rdev);
 177
 178 void rc_repeat(struct rc_dev *dev);
 179 void rc_keydown(struct rc_dev *dev, int scancode, u8 toggle);
 180 void rc_keydown_notimeout(struct rc_dev *dev, int scancode, u8 toggle);
 181 void rc_keyup(struct rc_dev *dev);
 182 u32 rc_g_keycode_from_table(struct rc_dev *dev, u32 scancode);
 183
 184 /*
 185  * From rc-raw.c
 186  * The Raw interface is specific to InfraRed. It may be a good idea to
 187  * split it later into a separate header.
 188  */
 189
 190 enum raw_event_type {
 191         IR_SPACE        = (1 << 0),
 192         IR_PULSE        = (1 << 1),
 193         IR_START_EVENT  = (1 << 2),
 194         IR_STOP_EVENT   = (1 << 3),
 195 };
 196
 197 struct ir_raw_event {
 198         union {
 199                 u32             duration;
 200
 201                 struct {
 202                         u32     carrier;
 203                         u8      duty_cycle;
 204                 };
 205         };
 206
 207         unsigned                pulse:1;
 208         unsigned                reset:1;
 209         unsigned                timeout:1;
 210         unsigned                carrier_report:1;
 211 };
 212
 213 #define DEFINE_IR_RAW_EVENT(event) \
 214         struct ir_raw_event event = { \
 215                 { .duration = 0 } , \
 216                 .pulse = 0, \
 217                 .reset = 0, \
 218                 .timeout = 0, \
 219                 .carrier_report = 0 }
 220
 221 static inline void init_ir_raw_event(struct ir_raw_event *ev)
 222 {
 223         memset(ev, 0, sizeof(*ev));
 224 }
 225
 226 #define IR_MAX_DURATION         0xFFFFFFFF      /* a bit more than 4 seconds */
 227 #define US_TO_NS(usec)          ((usec) * 1000)
 228 #define MS_TO_US(msec)          ((msec) * 1000)
 229 #define MS_TO_NS(msec)          ((msec) * 1000 * 1000)
 230
 231 void ir_raw_event_handle(struct rc_dev *dev);
 232 int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev);
 233 int ir_raw_event_store_edge(struct rc_dev *dev, enum raw_event_type type);
 234 int ir_raw_event_store_with_filter(struct rc_dev *dev,
 235                                 struct ir_raw_event *ev);
 236 void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
 237
 238 static inline void ir_raw_event_reset(struct rc_dev *dev)
 239 {
 240         DEFINE_IR_RAW_EVENT(ev);
 241         ev.reset = true;
 242
 243         ir_raw_event_store(dev, &ev);
 244         ir_raw_event_handle(dev);
 245 }
 246
 247 /* extract mask bits out of data and pack them into the result */
 248 static inline u32 ir_extract_bits(u32 data, u32 mask)
 249 {
 250         u32 vbit = 1, value = 0;
 251
 252         do {
 253                 if (mask & 1) {
 254                         if (data & 1)
 255                                 value |= vbit;
 256                         vbit <<= 1;
 257                 }
 258                 data >>= 1;
 259         } while (mask >>= 1);
 260
 261         return value;
 262 }
 263
 264 #endif /* _RC_CORE */