From 610705e780395ef30a1b8e53de150c37381ca31f Mon Sep 17 00:00:00 2001 From: Evgeniy Polyakov Date: Wed, 7 Jan 2009 18:08:59 -0800 Subject: [PATCH] w1: add list masters w1 command This patch series introduces and extends several userspace commands used with netlink protocol. Touch block command allows to write data and return sampled data to the userspace. Extended search and alarm seach commands to return list of slave devices found during given search. List masters command allows to send all registered master IDs to the userspace. Great thanks to Paul Alfille (owfs) who tested this implementation and wrote w1-to-network daemon http://sourceforge.net/projects/w1repeater/ and Frederik Deweerdt and Randy Dunlap for review. This patch: Returns list of registered bus master devices. Signed-off-by: Evgeniy Polyakov Cc: Paul Alfille Cc: Frederik Deweerdt Cc: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/w1/w1_netlink.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++ drivers/w1/w1_netlink.h | 1 + 2 files changed, 57 insertions(+) diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c index 65c5ebd..2e07b59 100644 --- a/drivers/w1/w1_netlink.c +++ b/drivers/w1/w1_netlink.c @@ -128,6 +128,59 @@ static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg, return err; } +static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd) +{ + struct w1_master *m; + struct cn_msg *cn; + struct w1_netlink_msg *w; + u32 *id; + + if (mcmd->type != W1_LIST_MASTERS) { + printk(KERN_NOTICE "%s: msg: %x.%x, wrong type: %u, len: %u.\n", + __func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len); + return -EPROTO; + } + + cn = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!cn) + return -ENOMEM; + + cn->id.idx = CN_W1_IDX; + cn->id.val = CN_W1_VAL; + + cn->seq = msg->seq; + cn->ack = 1; + cn->len = sizeof(struct w1_netlink_msg); + w = (struct w1_netlink_msg *)(cn + 1); + + w->type = W1_LIST_MASTERS; + w->reserved = 0; + w->len = 0; + id = (u32 *)(w + 1); + + mutex_lock(&w1_mlock); + list_for_each_entry(m, &w1_masters, w1_master_entry) { + if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) { + cn_netlink_send(cn, 0, GFP_KERNEL); + cn->ack++; + cn->len = sizeof(struct w1_netlink_msg); + w->len = 0; + id = (u32 *)(w + 1); + } + + *id = m->id; + w->len += sizeof(*id); + cn->len += sizeof(*id); + id++; + } + cn->ack = 0; + cn_netlink_send(cn, 0, GFP_KERNEL); + mutex_unlock(&w1_mlock); + + kfree(cn); + return 0; +} + static void w1_cn_callback(void *data) { struct cn_msg *msg = data; @@ -164,6 +217,9 @@ static void w1_cn_callback(void *data) sl = w1_search_slave(&id); if (sl) dev = sl->master; + } else { + err = w1_process_command_root(msg, m); + goto out_cont; } if (!dev) { diff --git a/drivers/w1/w1_netlink.h b/drivers/w1/w1_netlink.h index 56122b9..21913dfc 100644 --- a/drivers/w1/w1_netlink.h +++ b/drivers/w1/w1_netlink.h @@ -34,6 +34,7 @@ enum w1_netlink_message_types { W1_MASTER_REMOVE, W1_MASTER_CMD, W1_SLAVE_CMD, + W1_LIST_MASTERS, }; struct w1_netlink_msg -- 2.7.4