include/media/rc-core.h

   1 /*
   2  * Remote Controller core header
   3  *
   4  * Copyright (C) 2009-2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
   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_dev - represents a remote control device
  39  * @dev: driver model's view of this device
  40  * @input_name: name of the input child device
  41  * @input_phys: physical path to the input child device
  42  * @input_id: id of the input child device (struct input_id)
  43  * @driver_name: name of the hardware driver which registered this device
  44  * @map_name: name of the default keymap
  45  * @rc_map: current scan/key table
  46  * @lock: used to ensure we've filled in all protocol details before
  47  *      anyone can call show_protocols or store_protocols
  48  * @devno: unique remote control device number
  49  * @raw: additional data for raw pulse/space devices
  50  * @input_dev: the input child device used to communicate events to userspace
  51  * @driver_type: specifies if protocol decoding is done in hardware or software
  52  * @idle: used to keep track of RX state
  53  * @allowed_protos: bitmask with the supported RC_BIT_* protocols
  54  * @scanmask: some hardware decoders are not capable of providing the full
  55  *      scancode to the application. As this is a hardware limit, we can't do
  56  *      anything with it. Yet, as the same keycode table can be used with other
  57  *      devices, a mask is provided to allow its usage. Drivers should generally
  58  *      leave this field in blank
  59  * @priv: driver-specific data
  60  * @keylock: protects the remaining members of the struct
  61  * @keypressed: whether a key is currently pressed
  62  * @keyup_jiffies: time (in jiffies) when the current keypress should be released
  63  * @timer_keyup: timer for releasing a keypress
  64  * @last_keycode: keycode of last keypress
  65  * @last_scancode: scancode of last keypress
  66  * @last_toggle: toggle value of last command
  67  * @timeout: optional time after which device stops sending data
  68  * @min_timeout: minimum timeout supported by device
  69  * @max_timeout: maximum timeout supported by device
  70  * @rx_resolution : resolution (in ns) of input sampler
  71  * @tx_resolution: resolution (in ns) of output sampler
  72  * @change_protocol: allow changing the protocol used on hardware decoders
  73  * @open: callback to allow drivers to enable polling/irq when IR input device
  74  *      is opened.
  75  * @close: callback to allow drivers to disable polling/irq when IR input device
  76  *      is opened.
  77  * @s_tx_mask: set transmitter mask (for devices with multiple tx outputs)
  78  * @s_tx_carrier: set transmit carrier frequency
  79  * @s_tx_duty_cycle: set transmit duty cycle (0% - 100%)
  80  * @s_rx_carrier: inform driver about carrier it is expected to handle
  81  * @tx_ir: transmit IR
  82  * @s_idle: enable/disable hardware idle mode, upon which,
  83  *      device doesn't interrupt host until it sees IR pulses
  84  * @s_learning_mode: enable wide band receiver used for learning
  85  * @s_carrier_report: enable carrier reports
  86  */
  87 struct rc_dev {
  88         struct device                   dev;
  89         const char                      *input_name;
  90         const char                      *input_phys;
  91         struct input_id                 input_id;
  92         char                            *driver_name;
  93         const char                      *map_name;
  94         struct rc_map                   rc_map;
  95         struct mutex                    lock;
  96         unsigned long                   devno;
  97         struct ir_raw_event_ctrl        *raw;
  98         struct input_dev                *input_dev;
  99         enum rc_driver_type             driver_type;
 100         bool                            idle;
 101         u64                             allowed_protos;
 102         u32                             scanmask;
 103         void                            *priv;
 104         spinlock_t                      keylock;
 105         bool                            keypressed;
 106         unsigned long                   keyup_jiffies;
 107         struct timer_list               timer_keyup;
 108         u32                             last_keycode;
 109         u32                             last_scancode;
 110         u8                              last_toggle;
 111         u32                             timeout;
 112         u32                             min_timeout;
 113         u32                             max_timeout;
 114         u32                             rx_resolution;
 115         u32                             tx_resolution;
 116         int                             (*change_protocol)(struct rc_dev *dev, u64 *rc_type);
 117         int                             (*open)(struct rc_dev *dev);
 118         void                            (*close)(struct rc_dev *dev);
 119         int                             (*s_tx_mask)(struct rc_dev *dev, u32 mask);
 120         int                             (*s_tx_carrier)(struct rc_dev *dev, u32 carrier);
 121         int                             (*s_tx_duty_cycle)(struct rc_dev *dev, u32 duty_cycle);
 122         int                             (*s_rx_carrier_range)(struct rc_dev *dev, u32 min, u32 max);
 123         int                             (*tx_ir)(struct rc_dev *dev, unsigned *txbuf, unsigned n);
 124         void                            (*s_idle)(struct rc_dev *dev, bool enable);
 125         int                             (*s_learning_mode)(struct rc_dev *dev, int enable);
 126         int                             (*s_carrier_report) (struct rc_dev *dev, int enable);
 127 };
 128
 129 #define to_rc_dev(d) container_of(d, struct rc_dev, dev)
 130
 131 /*
 132  * From rc-main.c
 133  * Those functions can be used on any type of Remote Controller. They
 134  * basically creates an input_dev and properly reports the device as a
 135  * Remote Controller, at sys/class/rc.
 136  */
 137
 138 struct rc_dev *rc_allocate_device(void);
 139 void rc_free_device(struct rc_dev *dev);
 140 int rc_register_device(struct rc_dev *dev);
 141 void rc_unregister_device(struct rc_dev *dev);
 142
 143 void rc_repeat(struct rc_dev *dev);
 144 void rc_keydown(struct rc_dev *dev, int scancode, u8 toggle);
 145 void rc_keydown_notimeout(struct rc_dev *dev, int scancode, u8 toggle);
 146 void rc_keyup(struct rc_dev *dev);
 147 u32 rc_g_keycode_from_table(struct rc_dev *dev, u32 scancode);
 148
 149 /*
 150  * From rc-raw.c
 151  * The Raw interface is specific to InfraRed. It may be a good idea to
 152  * split it later into a separate header.
 153  */
 154
 155 enum raw_event_type {
 156         IR_SPACE        = (1 << 0),
 157         IR_PULSE        = (1 << 1),
 158         IR_START_EVENT  = (1 << 2),
 159         IR_STOP_EVENT   = (1 << 3),
 160 };
 161
 162 struct ir_raw_event {
 163         union {
 164                 u32             duration;
 165
 166                 struct {
 167                         u32     carrier;
 168                         u8      duty_cycle;
 169                 };
 170         };
 171
 172         unsigned                pulse:1;
 173         unsigned                reset:1;
 174         unsigned                timeout:1;
 175         unsigned                carrier_report:1;
 176 };
 177
 178 #define DEFINE_IR_RAW_EVENT(event) \
 179         struct ir_raw_event event = { \
 180                 { .duration = 0 } , \
 181                 .pulse = 0, \
 182                 .reset = 0, \
 183                 .timeout = 0, \
 184                 .carrier_report = 0 }
 185
 186 static inline void init_ir_raw_event(struct ir_raw_event *ev)
 187 {
 188         memset(ev, 0, sizeof(*ev));
 189 }
 190
 191 #define IR_MAX_DURATION         0xFFFFFFFF      /* a bit more than 4 seconds */
 192 #define US_TO_NS(usec)          ((usec) * 1000)
 193 #define MS_TO_US(msec)          ((msec) * 1000)
 194 #define MS_TO_NS(msec)          ((msec) * 1000 * 1000)
 195
 196 void ir_raw_event_handle(struct rc_dev *dev);
 197 int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev);
 198 int ir_raw_event_store_edge(struct rc_dev *dev, enum raw_event_type type);
 199 int ir_raw_event_store_with_filter(struct rc_dev *dev,
 200                                 struct ir_raw_event *ev);
 201 void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
 202
 203 static inline void ir_raw_event_reset(struct rc_dev *dev)
 204 {
 205         DEFINE_IR_RAW_EVENT(ev);
 206         ev.reset = true;
 207
 208         ir_raw_event_store(dev, &ev);
 209         ir_raw_event_handle(dev);
 210 }
 211
 212 /* extract mask bits out of data and pack them into the result */
 213 static inline u32 ir_extract_bits(u32 data, u32 mask)
 214 {
 215         u32 vbit = 1, value = 0;
 216
 217         do {
 218                 if (mask & 1) {
 219                         if (data & 1)
 220                                 value |= vbit;
 221                         vbit <<= 1;
 222                 }
 223                 data >>= 1;
 224         } while (mask >>= 1);
 225
 226         return value;
 227 }
 228
 229 #endif /* _RC_CORE */