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Diffstat (limited to '')
| -rw-r--r-- | drivers/w1/w1_netlink.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/w1/w1_netlink.h b/drivers/w1/w1_netlink.h new file mode 100644 index 000000000..449680a61 --- /dev/null +++ b/drivers/w1/w1_netlink.h @@ -0,0 +1,135 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net> + */ + +#ifndef __W1_NETLINK_H +#define __W1_NETLINK_H + +#include <asm/types.h> +#include <linux/connector.h> + +#include "w1_internal.h" + +/** + * enum w1_cn_msg_flags - bitfield flags for struct cn_msg.flags + * + * @W1_CN_BUNDLE: Request bundling replies into fewer messagse. Be prepared + * to handle multiple struct cn_msg, struct w1_netlink_msg, and + * struct w1_netlink_cmd in one packet. + */ +enum w1_cn_msg_flags { + W1_CN_BUNDLE = 1, +}; + +/** + * enum w1_netlink_message_types - message type + * + * @W1_SLAVE_ADD: notification that a slave device was added + * @W1_SLAVE_REMOVE: notification that a slave device was removed + * @W1_MASTER_ADD: notification that a new bus master was added + * @W1_MASTER_REMOVE: notification that a bus masterwas removed + * @W1_MASTER_CMD: initiate operations on a specific master + * @W1_SLAVE_CMD: sends reset, selects the slave, then does a read/write/touch + * operation + * @W1_LIST_MASTERS: used to determine the bus master identifiers + */ +enum w1_netlink_message_types { + W1_SLAVE_ADD = 0, + W1_SLAVE_REMOVE, + W1_MASTER_ADD, + W1_MASTER_REMOVE, + W1_MASTER_CMD, + W1_SLAVE_CMD, + W1_LIST_MASTERS, +}; + +/** + * struct w1_netlink_msg - holds w1 message type, id, and result + * + * @type: one of enum w1_netlink_message_types + * @status: kernel feedback for success 0 or errno failure value + * @len: length of data following w1_netlink_msg + * @id: union holding bus master id (msg.id) and slave device id (id[8]). + * @id.id: Slave ID (8 bytes) + * @id.mst: bus master identification + * @id.mst.id: bus master ID + * @id.mst.res: bus master reserved + * @data: start address of any following data + * + * The base message structure for w1 messages over netlink. + * The netlink connector data sequence is, struct nlmsghdr, struct cn_msg, + * then one or more struct w1_netlink_msg (each with optional data). + */ +struct w1_netlink_msg +{ + __u8 type; + __u8 status; + __u16 len; + union { + __u8 id[8]; + struct w1_mst { + __u32 id; + __u32 res; + } mst; + } id; + __u8 data[]; +}; + +/** + * enum w1_commands - commands available for master or slave operations + * + * @W1_CMD_READ: read len bytes + * @W1_CMD_WRITE: write len bytes + * @W1_CMD_SEARCH: initiate a standard search, returns only the slave + * devices found during that search + * @W1_CMD_ALARM_SEARCH: search for devices that are currently alarming + * @W1_CMD_TOUCH: Touches a series of bytes. + * @W1_CMD_RESET: sends a bus reset on the given master + * @W1_CMD_SLAVE_ADD: adds a slave to the given master, + * 8 byte slave id at data[0] + * @W1_CMD_SLAVE_REMOVE: removes a slave to the given master, + * 8 byte slave id at data[0] + * @W1_CMD_LIST_SLAVES: list of slaves registered on this master + * @W1_CMD_MAX: number of available commands + */ +enum w1_commands { + W1_CMD_READ = 0, + W1_CMD_WRITE, + W1_CMD_SEARCH, + W1_CMD_ALARM_SEARCH, + W1_CMD_TOUCH, + W1_CMD_RESET, + W1_CMD_SLAVE_ADD, + W1_CMD_SLAVE_REMOVE, + W1_CMD_LIST_SLAVES, + W1_CMD_MAX +}; + +/** + * struct w1_netlink_cmd - holds the command and data + * + * @cmd: one of enum w1_commands + * @res: reserved + * @len: length of data following w1_netlink_cmd + * @data: start address of any following data + * + * One or more struct w1_netlink_cmd is placed starting at w1_netlink_msg.data + * each with optional data. + */ +struct w1_netlink_cmd +{ + __u8 cmd; + __u8 res; + __u16 len; + __u8 data[]; +}; + +#ifdef __KERNEL__ + +void w1_netlink_send(struct w1_master *, struct w1_netlink_msg *); +int w1_init_netlink(void); +void w1_fini_netlink(void); + +#endif /* __KERNEL__ */ +#endif /* __W1_NETLINK_H */ |