380 lines
12 KiB
C
380 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Remote Controller core header
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*
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* Copyright (C) 2009-2010 by Mauro Carvalho Chehab
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*/
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#ifndef _RC_CORE
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#define _RC_CORE
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#include <linux/spinlock.h>
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#include <linux/cdev.h>
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#include <linux/kfifo.h>
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#include <linux/time.h>
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#include <linux/timer.h>
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#include <media/rc-map.h>
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/**
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* enum rc_driver_type - type of the RC driver.
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*
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* @RC_DRIVER_SCANCODE: Driver or hardware generates a scancode.
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* @RC_DRIVER_IR_RAW: Driver or hardware generates pulse/space sequences.
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* It needs a Infra-Red pulse/space decoder
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* @RC_DRIVER_IR_RAW_TX: Device transmitter only,
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* driver requires pulse/space data sequence.
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*/
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enum rc_driver_type {
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RC_DRIVER_SCANCODE = 0,
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RC_DRIVER_IR_RAW,
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RC_DRIVER_IR_RAW_TX,
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};
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/**
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* struct rc_scancode_filter - Filter scan codes.
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* @data: Scancode data to match.
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* @mask: Mask of bits of scancode to compare.
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*/
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struct rc_scancode_filter {
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u32 data;
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u32 mask;
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};
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/**
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* enum rc_filter_type - Filter type constants.
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* @RC_FILTER_NORMAL: Filter for normal operation.
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* @RC_FILTER_WAKEUP: Filter for waking from suspend.
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* @RC_FILTER_MAX: Number of filter types.
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*/
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enum rc_filter_type {
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RC_FILTER_NORMAL = 0,
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RC_FILTER_WAKEUP,
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RC_FILTER_MAX
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};
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/**
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* struct lirc_fh - represents an open lirc file
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* @list: list of open file handles
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* @rc: rcdev for this lirc chardev
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* @carrier_low: when setting the carrier range, first the low end must be
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* set with an ioctl and then the high end with another ioctl
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* @rawir: queue for incoming raw IR
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* @scancodes: queue for incoming decoded scancodes
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* @wait_poll: poll struct for lirc device
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* @send_mode: lirc mode for sending, either LIRC_MODE_SCANCODE or
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* LIRC_MODE_PULSE
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* @rec_mode: lirc mode for receiving, either LIRC_MODE_SCANCODE or
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* LIRC_MODE_MODE2
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*/
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struct lirc_fh {
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struct list_head list;
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struct rc_dev *rc;
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int carrier_low;
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DECLARE_KFIFO_PTR(rawir, unsigned int);
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DECLARE_KFIFO_PTR(scancodes, struct lirc_scancode);
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wait_queue_head_t wait_poll;
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u8 send_mode;
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u8 rec_mode;
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};
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/**
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* struct rc_dev - represents a remote control device
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* @dev: driver model's view of this device
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* @managed_alloc: devm_rc_allocate_device was used to create rc_dev
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* @sysfs_groups: sysfs attribute groups
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* @device_name: name of the rc child device
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* @input_phys: physical path to the input child device
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* @input_id: id of the input child device (struct input_id)
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* @driver_name: name of the hardware driver which registered this device
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* @map_name: name of the default keymap
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* @rc_map: current scan/key table
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* @lock: used to ensure we've filled in all protocol details before
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* anyone can call show_protocols or store_protocols
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* @minor: unique minor remote control device number
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* @raw: additional data for raw pulse/space devices
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* @input_dev: the input child device used to communicate events to userspace
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* @driver_type: specifies if protocol decoding is done in hardware or software
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* @idle: used to keep track of RX state
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* @encode_wakeup: wakeup filtering uses IR encode API, therefore the allowed
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* wakeup protocols is the set of all raw encoders
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* @allowed_protocols: bitmask with the supported RC_PROTO_BIT_* protocols
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* @enabled_protocols: bitmask with the enabled RC_PROTO_BIT_* protocols
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* @allowed_wakeup_protocols: bitmask with the supported RC_PROTO_BIT_* wakeup
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* protocols
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* @wakeup_protocol: the enabled RC_PROTO_* wakeup protocol or
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* RC_PROTO_UNKNOWN if disabled.
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* @scancode_filter: scancode filter
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* @scancode_wakeup_filter: scancode wakeup filters
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* @scancode_mask: some hardware decoders are not capable of providing the full
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* scancode to the application. As this is a hardware limit, we can't do
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* anything with it. Yet, as the same keycode table can be used with other
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* devices, a mask is provided to allow its usage. Drivers should generally
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* leave this field in blank
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* @users: number of current users of the device
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* @priv: driver-specific data
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* @keylock: protects the remaining members of the struct
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* @keypressed: whether a key is currently pressed
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* @keyup_jiffies: time (in jiffies) when the current keypress should be released
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* @timer_keyup: timer for releasing a keypress
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* @timer_repeat: timer for autorepeat events. This is needed for CEC, which
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* has non-standard repeats.
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* @last_keycode: keycode of last keypress
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* @last_protocol: protocol of last keypress
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* @last_scancode: scancode of last keypress
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* @last_toggle: toggle value of last command
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* @timeout: optional time after which device stops sending data
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* @min_timeout: minimum timeout supported by device
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* @max_timeout: maximum timeout supported by device
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* @rx_resolution : resolution (in us) of input sampler
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* @tx_resolution: resolution (in us) of output sampler
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* @lirc_dev: lirc device
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* @lirc_cdev: lirc char cdev
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* @gap_start: start time for gap after timeout if non-zero
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* @lirc_fh_lock: protects lirc_fh list
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* @lirc_fh: list of open files
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* @registered: set to true by rc_register_device(), false by
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* rc_unregister_device
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* @change_protocol: allow changing the protocol used on hardware decoders
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* @open: callback to allow drivers to enable polling/irq when IR input device
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* is opened.
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* @close: callback to allow drivers to disable polling/irq when IR input device
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* is opened.
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* @s_tx_mask: set transmitter mask (for devices with multiple tx outputs)
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* @s_tx_carrier: set transmit carrier frequency
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* @s_tx_duty_cycle: set transmit duty cycle (0% - 100%)
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* @s_rx_carrier_range: inform driver about carrier it is expected to handle
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* @tx_ir: transmit IR
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* @s_idle: enable/disable hardware idle mode, upon which,
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* device doesn't interrupt host until it sees IR pulses
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* @s_wideband_receiver: enable wide band receiver used for learning
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* @s_carrier_report: enable carrier reports
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* @s_filter: set the scancode filter
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* @s_wakeup_filter: set the wakeup scancode filter. If the mask is zero
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* then wakeup should be disabled. wakeup_protocol will be set to
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* a valid protocol if mask is nonzero.
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* @s_timeout: set hardware timeout in us
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*/
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struct rc_dev {
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struct device dev;
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bool managed_alloc;
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const struct attribute_group *sysfs_groups[5];
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const char *device_name;
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const char *input_phys;
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struct input_id input_id;
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const char *driver_name;
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const char *map_name;
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struct rc_map rc_map;
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struct mutex lock;
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unsigned int minor;
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struct ir_raw_event_ctrl *raw;
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struct input_dev *input_dev;
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enum rc_driver_type driver_type;
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bool idle;
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bool encode_wakeup;
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u64 allowed_protocols;
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u64 enabled_protocols;
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u64 allowed_wakeup_protocols;
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enum rc_proto wakeup_protocol;
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struct rc_scancode_filter scancode_filter;
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struct rc_scancode_filter scancode_wakeup_filter;
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u32 scancode_mask;
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u32 users;
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void *priv;
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spinlock_t keylock;
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bool keypressed;
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unsigned long keyup_jiffies;
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struct timer_list timer_keyup;
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struct timer_list timer_repeat;
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u32 last_keycode;
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enum rc_proto last_protocol;
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u64 last_scancode;
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u8 last_toggle;
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u32 timeout;
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u32 min_timeout;
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u32 max_timeout;
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u32 rx_resolution;
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u32 tx_resolution;
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#ifdef CONFIG_LIRC
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struct device lirc_dev;
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struct cdev lirc_cdev;
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ktime_t gap_start;
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spinlock_t lirc_fh_lock;
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struct list_head lirc_fh;
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#endif
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bool registered;
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int (*change_protocol)(struct rc_dev *dev, u64 *rc_proto);
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int (*open)(struct rc_dev *dev);
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void (*close)(struct rc_dev *dev);
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int (*s_tx_mask)(struct rc_dev *dev, u32 mask);
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int (*s_tx_carrier)(struct rc_dev *dev, u32 carrier);
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int (*s_tx_duty_cycle)(struct rc_dev *dev, u32 duty_cycle);
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int (*s_rx_carrier_range)(struct rc_dev *dev, u32 min, u32 max);
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int (*tx_ir)(struct rc_dev *dev, unsigned *txbuf, unsigned n);
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void (*s_idle)(struct rc_dev *dev, bool enable);
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int (*s_wideband_receiver)(struct rc_dev *dev, int enable);
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int (*s_carrier_report) (struct rc_dev *dev, int enable);
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int (*s_filter)(struct rc_dev *dev,
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struct rc_scancode_filter *filter);
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int (*s_wakeup_filter)(struct rc_dev *dev,
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struct rc_scancode_filter *filter);
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int (*s_timeout)(struct rc_dev *dev,
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unsigned int timeout);
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};
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#define to_rc_dev(d) container_of(d, struct rc_dev, dev)
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/*
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* From rc-main.c
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* Those functions can be used on any type of Remote Controller. They
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* basically creates an input_dev and properly reports the device as a
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* Remote Controller, at sys/class/rc.
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*/
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/**
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* rc_allocate_device - Allocates a RC device
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*
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* @rc_driver_type: specifies the type of the RC output to be allocated
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* returns a pointer to struct rc_dev.
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*/
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struct rc_dev *rc_allocate_device(enum rc_driver_type);
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/**
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* devm_rc_allocate_device - Managed RC device allocation
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*
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* @dev: pointer to struct device
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* @rc_driver_type: specifies the type of the RC output to be allocated
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* returns a pointer to struct rc_dev.
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*/
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struct rc_dev *devm_rc_allocate_device(struct device *dev, enum rc_driver_type);
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/**
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* rc_free_device - Frees a RC device
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*
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* @dev: pointer to struct rc_dev.
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*/
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void rc_free_device(struct rc_dev *dev);
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/**
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* rc_register_device - Registers a RC device
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*
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* @dev: pointer to struct rc_dev.
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*/
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int rc_register_device(struct rc_dev *dev);
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/**
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* devm_rc_register_device - Manageded registering of a RC device
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*
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* @parent: pointer to struct device.
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* @dev: pointer to struct rc_dev.
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*/
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int devm_rc_register_device(struct device *parent, struct rc_dev *dev);
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/**
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* rc_unregister_device - Unregisters a RC device
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*
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* @dev: pointer to struct rc_dev.
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*/
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void rc_unregister_device(struct rc_dev *dev);
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void rc_repeat(struct rc_dev *dev);
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void rc_keydown(struct rc_dev *dev, enum rc_proto protocol, u64 scancode,
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u8 toggle);
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void rc_keydown_notimeout(struct rc_dev *dev, enum rc_proto protocol,
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u64 scancode, u8 toggle);
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void rc_keyup(struct rc_dev *dev);
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u32 rc_g_keycode_from_table(struct rc_dev *dev, u64 scancode);
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/*
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* From rc-raw.c
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* The Raw interface is specific to InfraRed. It may be a good idea to
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* split it later into a separate header.
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*/
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struct ir_raw_event {
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union {
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u32 duration;
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u32 carrier;
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};
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u8 duty_cycle;
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unsigned pulse:1;
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unsigned overflow:1;
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unsigned timeout:1;
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unsigned carrier_report:1;
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};
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#define US_TO_NS(usec) ((usec) * 1000)
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#define MS_TO_US(msec) ((msec) * 1000)
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#define IR_MAX_DURATION MS_TO_US(500)
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#define IR_DEFAULT_TIMEOUT MS_TO_US(125)
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#define IR_MAX_TIMEOUT LIRC_VALUE_MASK
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void ir_raw_event_handle(struct rc_dev *dev);
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int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev);
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int ir_raw_event_store_edge(struct rc_dev *dev, bool pulse);
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int ir_raw_event_store_with_filter(struct rc_dev *dev,
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struct ir_raw_event *ev);
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int ir_raw_event_store_with_timeout(struct rc_dev *dev,
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struct ir_raw_event *ev);
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void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
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int ir_raw_encode_scancode(enum rc_proto protocol, u32 scancode,
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struct ir_raw_event *events, unsigned int max);
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int ir_raw_encode_carrier(enum rc_proto protocol);
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static inline void ir_raw_event_overflow(struct rc_dev *dev)
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{
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ir_raw_event_store(dev, &((struct ir_raw_event) { .overflow = true }));
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dev->idle = true;
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ir_raw_event_handle(dev);
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}
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/* extract mask bits out of data and pack them into the result */
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static inline u32 ir_extract_bits(u32 data, u32 mask)
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{
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u32 vbit = 1, value = 0;
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do {
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if (mask & 1) {
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if (data & 1)
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value |= vbit;
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vbit <<= 1;
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}
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data >>= 1;
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} while (mask >>= 1);
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return value;
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}
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/* Get NEC scancode and protocol type from address and command bytes */
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static inline u32 ir_nec_bytes_to_scancode(u8 address, u8 not_address,
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u8 command, u8 not_command,
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enum rc_proto *protocol)
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{
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u32 scancode;
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if ((command ^ not_command) != 0xff) {
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/* NEC transport, but modified protocol, used by at
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* least Apple and TiVo remotes
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*/
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scancode = not_address << 24 |
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address << 16 |
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not_command << 8 |
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command;
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*protocol = RC_PROTO_NEC32;
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} else if ((address ^ not_address) != 0xff) {
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/* Extended NEC */
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scancode = address << 16 |
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not_address << 8 |
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command;
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*protocol = RC_PROTO_NECX;
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} else {
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/* Normal NEC */
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scancode = address << 8 | command;
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*protocol = RC_PROTO_NEC;
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}
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return scancode;
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}
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#endif /* _RC_CORE */
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