cdev.h (5129B) - Raw
1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ 2 /* 3 * Surface System Aggregator Module (SSAM) user-space EC interface. 4 * 5 * Definitions, structs, and IOCTLs for the /dev/surface/aggregator misc 6 * device. This device provides direct user-space access to the SSAM EC. 7 * Intended for debugging and development. 8 * 9 * Copyright (C) 2020-2021 Maximilian Luz <luzmaximilian@gmail.com> 10 */ 11 12 #ifndef _LINUX_SURFACE_AGGREGATOR_CDEV_H 13 #define _LINUX_SURFACE_AGGREGATOR_CDEV_H 14 15 #include <linux/ioctl.h> 16 #include <linux/types.h> 17 18 /** 19 * enum ssam_cdev_request_flags - Request flags for SSAM cdev request IOCTL. 20 * 21 * @SSAM_CDEV_REQUEST_HAS_RESPONSE: 22 * Specifies that the request expects a response. If not set, the request 23 * will be directly completed after its underlying packet has been 24 * transmitted. If set, the request transport system waits for a response 25 * of the request. 26 * 27 * @SSAM_CDEV_REQUEST_UNSEQUENCED: 28 * Specifies that the request should be transmitted via an unsequenced 29 * packet. If set, the request must not have a response, meaning that this 30 * flag and the %SSAM_CDEV_REQUEST_HAS_RESPONSE flag are mutually 31 * exclusive. 32 */ 33 enum ssam_cdev_request_flags { 34 SSAM_CDEV_REQUEST_HAS_RESPONSE = 0x01, 35 SSAM_CDEV_REQUEST_UNSEQUENCED = 0x02, 36 }; 37 38 /** 39 * struct ssam_cdev_request - Controller request IOCTL argument. 40 * @target_category: Target category of the SAM request. 41 * @target_id: Target ID of the SAM request. 42 * @command_id: Command ID of the SAM request. 43 * @instance_id: Instance ID of the SAM request. 44 * @flags: Request flags (see &enum ssam_cdev_request_flags). 45 * @status: Request status (output). 46 * @payload: Request payload (input data). 47 * @payload.data: Pointer to request payload data. 48 * @payload.length: Length of request payload data (in bytes). 49 * @response: Request response (output data). 50 * @response.data: Pointer to response buffer. 51 * @response.length: On input: Capacity of response buffer (in bytes). 52 * On output: Length of request response (number of bytes 53 * in the buffer that are actually used). 54 */ 55 struct ssam_cdev_request { 56 __u8 target_category; 57 __u8 target_id; 58 __u8 command_id; 59 __u8 instance_id; 60 __u16 flags; 61 __s16 status; 62 63 struct { 64 __u64 data; 65 __u16 length; 66 __u8 __pad[6]; 67 } payload; 68 69 struct { 70 __u64 data; 71 __u16 length; 72 __u8 __pad[6]; 73 } response; 74 } __attribute__((__packed__)); 75 76 /** 77 * struct ssam_cdev_notifier_desc - Notifier descriptor. 78 * @priority: Priority value determining the order in which notifier 79 * callbacks will be called. A higher value means higher 80 * priority, i.e. the associated callback will be executed 81 * earlier than other (lower priority) callbacks. 82 * @target_category: The event target category for which this notifier should 83 * receive events. 84 * 85 * Specifies the notifier that should be registered or unregistered, 86 * specifically with which priority and for which target category of events. 87 */ 88 struct ssam_cdev_notifier_desc { 89 __s32 priority; 90 __u8 target_category; 91 } __attribute__((__packed__)); 92 93 /** 94 * struct ssam_cdev_event_desc - Event descriptor. 95 * @reg: Registry via which the event will be enabled/disabled. 96 * @reg.target_category: Target category for the event registry requests. 97 * @reg.target_id: Target ID for the event registry requests. 98 * @reg.cid_enable: Command ID for the event-enable request. 99 * @reg.cid_disable: Command ID for the event-disable request. 100 * @id: ID specifying the event. 101 * @id.target_category: Target category of the event source. 102 * @id.instance: Instance ID of the event source. 103 * @flags: Flags used for enabling the event. 104 * 105 * Specifies which event should be enabled/disabled and how to do that. 106 */ 107 struct ssam_cdev_event_desc { 108 struct { 109 __u8 target_category; 110 __u8 target_id; 111 __u8 cid_enable; 112 __u8 cid_disable; 113 } reg; 114 115 struct { 116 __u8 target_category; 117 __u8 instance; 118 } id; 119 120 __u8 flags; 121 } __attribute__((__packed__)); 122 123 /** 124 * struct ssam_cdev_event - SSAM event sent by the EC. 125 * @target_category: Target category of the event source. See &enum ssam_ssh_tc. 126 * @target_id: Target ID of the event source. 127 * @command_id: Command ID of the event. 128 * @instance_id: Instance ID of the event source. 129 * @length: Length of the event payload in bytes. 130 * @data: Event payload data. 131 */ 132 struct ssam_cdev_event { 133 __u8 target_category; 134 __u8 target_id; 135 __u8 command_id; 136 __u8 instance_id; 137 __u16 length; 138 __u8 data[]; 139 } __attribute__((__packed__)); 140 141 #define SSAM_CDEV_REQUEST _IOWR(0xA5, 1, struct ssam_cdev_request) 142 #define SSAM_CDEV_NOTIF_REGISTER _IOW(0xA5, 2, struct ssam_cdev_notifier_desc) 143 #define SSAM_CDEV_NOTIF_UNREGISTER _IOW(0xA5, 3, struct ssam_cdev_notifier_desc) 144 #define SSAM_CDEV_EVENT_ENABLE _IOW(0xA5, 4, struct ssam_cdev_event_desc) 145 #define SSAM_CDEV_EVENT_DISABLE _IOW(0xA5, 5, struct ssam_cdev_event_desc) 146 147 #endif /* _LINUX_SURFACE_AGGREGATOR_CDEV_H */