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Diffstat (limited to 'include/media/rc-core.h')
| -rw-r--r-- | include/media/rc-core.h | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/include/media/rc-core.h b/include/media/rc-core.h new file mode 100644 index 000000000..803349599 --- /dev/null +++ b/include/media/rc-core.h @@ -0,0 +1,379 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Remote Controller core header + * + * Copyright (C) 2009-2010 by Mauro Carvalho Chehab + */ + +#ifndef _RC_CORE +#define _RC_CORE + +#include <linux/spinlock.h> +#include <linux/cdev.h> +#include <linux/kfifo.h> +#include <linux/time.h> +#include <linux/timer.h> +#include <media/rc-map.h> + +/** + * enum rc_driver_type - type of the RC driver. + * + * @RC_DRIVER_SCANCODE: Driver or hardware generates a scancode. + * @RC_DRIVER_IR_RAW: Driver or hardware generates pulse/space sequences. + * It needs a Infra-Red pulse/space decoder + * @RC_DRIVER_IR_RAW_TX: Device transmitter only, + * driver requires pulse/space data sequence. + */ +enum rc_driver_type { + RC_DRIVER_SCANCODE = 0, + RC_DRIVER_IR_RAW, + RC_DRIVER_IR_RAW_TX, +}; + +/** + * struct rc_scancode_filter - Filter scan codes. + * @data: Scancode data to match. + * @mask: Mask of bits of scancode to compare. + */ +struct rc_scancode_filter { + u32 data; + u32 mask; +}; + +/** + * enum rc_filter_type - Filter type constants. + * @RC_FILTER_NORMAL: Filter for normal operation. + * @RC_FILTER_WAKEUP: Filter for waking from suspend. + * @RC_FILTER_MAX: Number of filter types. + */ +enum rc_filter_type { + RC_FILTER_NORMAL = 0, + RC_FILTER_WAKEUP, + + RC_FILTER_MAX +}; + +/** + * struct lirc_fh - represents an open lirc file + * @list: list of open file handles + * @rc: rcdev for this lirc chardev + * @carrier_low: when setting the carrier range, first the low end must be + * set with an ioctl and then the high end with another ioctl + * @rawir: queue for incoming raw IR + * @scancodes: queue for incoming decoded scancodes + * @wait_poll: poll struct for lirc device + * @send_mode: lirc mode for sending, either LIRC_MODE_SCANCODE or + * LIRC_MODE_PULSE + * @rec_mode: lirc mode for receiving, either LIRC_MODE_SCANCODE or + * LIRC_MODE_MODE2 + */ +struct lirc_fh { + struct list_head list; + struct rc_dev *rc; + int carrier_low; + DECLARE_KFIFO_PTR(rawir, unsigned int); + DECLARE_KFIFO_PTR(scancodes, struct lirc_scancode); + wait_queue_head_t wait_poll; + u8 send_mode; + u8 rec_mode; +}; + +/** + * struct rc_dev - represents a remote control device + * @dev: driver model's view of this device + * @managed_alloc: devm_rc_allocate_device was used to create rc_dev + * @sysfs_groups: sysfs attribute groups + * @device_name: name of the rc child device + * @input_phys: physical path to the input child device + * @input_id: id of the input child device (struct input_id) + * @driver_name: name of the hardware driver which registered this device + * @map_name: name of the default keymap + * @rc_map: current scan/key table + * @lock: used to ensure we've filled in all protocol details before + * anyone can call show_protocols or store_protocols + * @minor: unique minor remote control device number + * @raw: additional data for raw pulse/space devices + * @input_dev: the input child device used to communicate events to userspace + * @driver_type: specifies if protocol decoding is done in hardware or software + * @idle: used to keep track of RX state + * @encode_wakeup: wakeup filtering uses IR encode API, therefore the allowed + * wakeup protocols is the set of all raw encoders + * @allowed_protocols: bitmask with the supported RC_PROTO_BIT_* protocols + * @enabled_protocols: bitmask with the enabled RC_PROTO_BIT_* protocols + * @allowed_wakeup_protocols: bitmask with the supported RC_PROTO_BIT_* wakeup + * protocols + * @wakeup_protocol: the enabled RC_PROTO_* wakeup protocol or + * RC_PROTO_UNKNOWN if disabled. + * @scancode_filter: scancode filter + * @scancode_wakeup_filter: scancode wakeup filters + * @scancode_mask: some hardware decoders are not capable of providing the full + * scancode to the application. As this is a hardware limit, we can't do + * anything with it. Yet, as the same keycode table can be used with other + * devices, a mask is provided to allow its usage. Drivers should generally + * leave this field in blank + * @users: number of current users of the device + * @priv: driver-specific data + * @keylock: protects the remaining members of the struct + * @keypressed: whether a key is currently pressed + * @keyup_jiffies: time (in jiffies) when the current keypress should be released + * @timer_keyup: timer for releasing a keypress + * @timer_repeat: timer for autorepeat events. This is needed for CEC, which + * has non-standard repeats. + * @last_keycode: keycode of last keypress + * @last_protocol: protocol of last keypress + * @last_scancode: scancode of last keypress + * @last_toggle: toggle value of last command + * @timeout: optional time after which device stops sending data + * @min_timeout: minimum timeout supported by device + * @max_timeout: maximum timeout supported by device + * @rx_resolution : resolution (in us) of input sampler + * @tx_resolution: resolution (in us) of output sampler + * @lirc_dev: lirc device + * @lirc_cdev: lirc char cdev + * @gap_start: start time for gap after timeout if non-zero + * @lirc_fh_lock: protects lirc_fh list + * @lirc_fh: list of open files + * @registered: set to true by rc_register_device(), false by + * rc_unregister_device + * @change_protocol: allow changing the protocol used on hardware decoders + * @open: callback to allow drivers to enable polling/irq when IR input device + * is opened. + * @close: callback to allow drivers to disable polling/irq when IR input device + * is opened. + * @s_tx_mask: set transmitter mask (for devices with multiple tx outputs) + * @s_tx_carrier: set transmit carrier frequency + * @s_tx_duty_cycle: set transmit duty cycle (0% - 100%) + * @s_rx_carrier_range: inform driver about carrier it is expected to handle + * @tx_ir: transmit IR + * @s_idle: enable/disable hardware idle mode, upon which, + * device doesn't interrupt host until it sees IR pulses + * @s_wideband_receiver: enable wide band receiver used for learning + * @s_carrier_report: enable carrier reports + * @s_filter: set the scancode filter + * @s_wakeup_filter: set the wakeup scancode filter. If the mask is zero + * then wakeup should be disabled. wakeup_protocol will be set to + * a valid protocol if mask is nonzero. + * @s_timeout: set hardware timeout in us + */ +struct rc_dev { + struct device dev; + bool managed_alloc; + const struct attribute_group *sysfs_groups[5]; + const char *device_name; + const char *input_phys; + struct input_id input_id; + const char *driver_name; + const char *map_name; + struct rc_map rc_map; + struct mutex lock; + unsigned int minor; + struct ir_raw_event_ctrl *raw; + struct input_dev *input_dev; + enum rc_driver_type driver_type; + bool idle; + bool encode_wakeup; + u64 allowed_protocols; + u64 enabled_protocols; + u64 allowed_wakeup_protocols; + enum rc_proto wakeup_protocol; + struct rc_scancode_filter scancode_filter; + struct rc_scancode_filter scancode_wakeup_filter; + u32 scancode_mask; + u32 users; + void *priv; + spinlock_t keylock; + bool keypressed; + unsigned long keyup_jiffies; + struct timer_list timer_keyup; + struct timer_list timer_repeat; + u32 last_keycode; + enum rc_proto last_protocol; + u64 last_scancode; + u8 last_toggle; + u32 timeout; + u32 min_timeout; + u32 max_timeout; + u32 rx_resolution; + u32 tx_resolution; +#ifdef CONFIG_LIRC + struct device lirc_dev; + struct cdev lirc_cdev; + ktime_t gap_start; + spinlock_t lirc_fh_lock; + struct list_head lirc_fh; +#endif + bool registered; + int (*change_protocol)(struct rc_dev *dev, u64 *rc_proto); + int (*open)(struct rc_dev *dev); + void (*close)(struct rc_dev *dev); + int (*s_tx_mask)(struct rc_dev *dev, u32 mask); + int (*s_tx_carrier)(struct rc_dev *dev, u32 carrier); + int (*s_tx_duty_cycle)(struct rc_dev *dev, u32 duty_cycle); + int (*s_rx_carrier_range)(struct rc_dev *dev, u32 min, u32 max); + int (*tx_ir)(struct rc_dev *dev, unsigned *txbuf, unsigned n); + void (*s_idle)(struct rc_dev *dev, bool enable); + int (*s_wideband_receiver)(struct rc_dev *dev, int enable); + int (*s_carrier_report) (struct rc_dev *dev, int enable); + int (*s_filter)(struct rc_dev *dev, + struct rc_scancode_filter *filter); + int (*s_wakeup_filter)(struct rc_dev *dev, + struct rc_scancode_filter *filter); + int (*s_timeout)(struct rc_dev *dev, + unsigned int timeout); +}; + +#define to_rc_dev(d) container_of(d, struct rc_dev, dev) + +/* + * From rc-main.c + * Those functions can be used on any type of Remote Controller. They + * basically creates an input_dev and properly reports the device as a + * Remote Controller, at sys/class/rc. + */ + +/** + * rc_allocate_device - Allocates a RC device + * + * @rc_driver_type: specifies the type of the RC output to be allocated + * returns a pointer to struct rc_dev. + */ +struct rc_dev *rc_allocate_device(enum rc_driver_type); + +/** + * devm_rc_allocate_device - Managed RC device allocation + * + * @dev: pointer to struct device + * @rc_driver_type: specifies the type of the RC output to be allocated + * returns a pointer to struct rc_dev. + */ +struct rc_dev *devm_rc_allocate_device(struct device *dev, enum rc_driver_type); + +/** + * rc_free_device - Frees a RC device + * + * @dev: pointer to struct rc_dev. + */ +void rc_free_device(struct rc_dev *dev); + +/** + * rc_register_device - Registers a RC device + * + * @dev: pointer to struct rc_dev. + */ +int rc_register_device(struct rc_dev *dev); + +/** + * devm_rc_register_device - Manageded registering of a RC device + * + * @parent: pointer to struct device. + * @dev: pointer to struct rc_dev. + */ +int devm_rc_register_device(struct device *parent, struct rc_dev *dev); + +/** + * rc_unregister_device - Unregisters a RC device + * + * @dev: pointer to struct rc_dev. + */ +void rc_unregister_device(struct rc_dev *dev); + +void rc_repeat(struct rc_dev *dev); +void rc_keydown(struct rc_dev *dev, enum rc_proto protocol, u64 scancode, + u8 toggle); +void rc_keydown_notimeout(struct rc_dev *dev, enum rc_proto protocol, + u64 scancode, u8 toggle); +void rc_keyup(struct rc_dev *dev); +u32 rc_g_keycode_from_table(struct rc_dev *dev, u64 scancode); + +/* + * From rc-raw.c + * The Raw interface is specific to InfraRed. It may be a good idea to + * split it later into a separate header. + */ +struct ir_raw_event { + union { + u32 duration; + u32 carrier; + }; + u8 duty_cycle; + + unsigned pulse:1; + unsigned overflow:1; + unsigned timeout:1; + unsigned carrier_report:1; +}; + +#define US_TO_NS(usec) ((usec) * 1000) +#define MS_TO_US(msec) ((msec) * 1000) +#define IR_MAX_DURATION MS_TO_US(500) +#define IR_DEFAULT_TIMEOUT MS_TO_US(125) +#define IR_MAX_TIMEOUT LIRC_VALUE_MASK + +void ir_raw_event_handle(struct rc_dev *dev); +int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev); +int ir_raw_event_store_edge(struct rc_dev *dev, bool pulse); +int ir_raw_event_store_with_filter(struct rc_dev *dev, + struct ir_raw_event *ev); +int ir_raw_event_store_with_timeout(struct rc_dev *dev, + struct ir_raw_event *ev); +void ir_raw_event_set_idle(struct rc_dev *dev, bool idle); +int ir_raw_encode_scancode(enum rc_proto protocol, u32 scancode, + struct ir_raw_event *events, unsigned int max); +int ir_raw_encode_carrier(enum rc_proto protocol); + +static inline void ir_raw_event_overflow(struct rc_dev *dev) +{ + ir_raw_event_store(dev, &((struct ir_raw_event) { .overflow = true })); + dev->idle = true; + ir_raw_event_handle(dev); +} + +/* extract mask bits out of data and pack them into the result */ +static inline u32 ir_extract_bits(u32 data, u32 mask) +{ + u32 vbit = 1, value = 0; + + do { + if (mask & 1) { + if (data & 1) + value |= vbit; + vbit <<= 1; + } + data >>= 1; + } while (mask >>= 1); + + return value; +} + +/* Get NEC scancode and protocol type from address and command bytes */ +static inline u32 ir_nec_bytes_to_scancode(u8 address, u8 not_address, + u8 command, u8 not_command, + enum rc_proto *protocol) +{ + u32 scancode; + + if ((command ^ not_command) != 0xff) { + /* NEC transport, but modified protocol, used by at + * least Apple and TiVo remotes + */ + scancode = not_address << 24 | + address << 16 | + not_command << 8 | + command; + *protocol = RC_PROTO_NEC32; + } else if ((address ^ not_address) != 0xff) { + /* Extended NEC */ + scancode = address << 16 | + not_address << 8 | + command; + *protocol = RC_PROTO_NECX; + } else { + /* Normal NEC */ + scancode = address << 8 | command; + *protocol = RC_PROTO_NEC; + } + + return scancode; +} + +#endif /* _RC_CORE */ |