lkml.org 
[lkml]   [2008]   [Dec]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[w1] Allow master IO commands.
Date
This patch allows to start IO not against already found slave devices,
but against the bus itself, which can be used for example to probe device.

Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net>
---
drivers/w1/w1_netlink.c | 126 ++++++++++++++++++++++++++---------------------
1 files changed, 69 insertions(+), 57 deletions(-)
diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c
index 24ad6bb..0267fe4 100644
--- a/drivers/w1/w1_netlink.c
+++ b/drivers/w1/w1_netlink.c
@@ -95,51 +95,8 @@ static int w1_process_search_command(struct w1_master *dev, struct cn_msg *msg,
return 0;
}

-static int w1_process_command_master(struct w1_master *dev, struct cn_msg *req_msg,
- struct w1_netlink_msg *req_hdr, struct w1_netlink_cmd *req_cmd)
-{
- int err = -EINVAL;
- struct cn_msg *msg;
- struct w1_netlink_msg *hdr;
- struct w1_netlink_cmd *cmd;
-
- msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
- if (!msg)
- return -ENOMEM;
-
- msg->id = req_msg->id;
- msg->seq = req_msg->seq;
- msg->ack = 0;
- msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
-
- hdr = (struct w1_netlink_msg *)(msg + 1);
- cmd = (struct w1_netlink_cmd *)(hdr + 1);
-
- hdr->type = W1_MASTER_CMD;
- hdr->id = req_hdr->id;
- hdr->len = sizeof(struct w1_netlink_cmd);
-
- cmd->cmd = req_cmd->cmd;
- cmd->len = 0;
-
- switch (cmd->cmd) {
- case W1_CMD_SEARCH:
- case W1_CMD_ALARM_SEARCH:
- err = w1_process_search_command(dev, msg,
- PAGE_SIZE - msg->len - sizeof(struct cn_msg));
- break;
- default:
- cmd->res = EINVAL;
- cn_netlink_send(msg, 0, GFP_KERNEL);
- break;
- }
-
- kfree(msg);
- return err;
-}
-
-static int w1_send_read_reply(struct w1_slave *sl, struct cn_msg *msg,
- struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
+static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,
+ struct w1_netlink_cmd *cmd)
{
void *data;
struct w1_netlink_msg *h;
@@ -163,7 +120,8 @@ static int w1_send_read_reply(struct w1_slave *sl, struct cn_msg *msg,
memcpy(c, cmd, sizeof(struct w1_netlink_cmd));

cm->ack = msg->seq+1;
- cm->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd) + cmd->len;
+ cm->len = sizeof(struct w1_netlink_msg) +
+ sizeof(struct w1_netlink_cmd) + cmd->len;

h->len = sizeof(struct w1_netlink_cmd) + cmd->len;

@@ -176,26 +134,22 @@ static int w1_send_read_reply(struct w1_slave *sl, struct cn_msg *msg,
return err;
}

-static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
+static int w1_process_command_io(struct w1_master *dev, struct cn_msg *msg,
struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
{
int err = 0;

- dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
- __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id, sl->reg_num.crc,
- cmd->cmd, cmd->len);
-
switch (cmd->cmd) {
case W1_CMD_TOUCH:
- w1_touch_block(sl->master, cmd->data, cmd->len);
- w1_send_read_reply(sl, msg, hdr, cmd);
+ w1_touch_block(dev, cmd->data, cmd->len);
+ w1_send_read_reply(msg, hdr, cmd);
break;
case W1_CMD_READ:
- w1_read_block(sl->master, cmd->data, cmd->len);
- w1_send_read_reply(sl, msg, hdr, cmd);
+ w1_read_block(dev, cmd->data, cmd->len);
+ w1_send_read_reply(msg, hdr, cmd);
break;
case W1_CMD_WRITE:
- w1_write_block(sl->master, cmd->data, cmd->len);
+ w1_write_block(dev, cmd->data, cmd->len);
break;
default:
err = -1;
@@ -205,6 +159,64 @@ static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
return err;
}

+static int w1_process_command_master(struct w1_master *dev, struct cn_msg *req_msg,
+ struct w1_netlink_msg *req_hdr, struct w1_netlink_cmd *req_cmd)
+{
+ int err = -EINVAL;
+ struct cn_msg *msg;
+ struct w1_netlink_msg *hdr;
+ struct w1_netlink_cmd *cmd;
+
+ msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ msg->id = req_msg->id;
+ msg->seq = req_msg->seq;
+ msg->ack = 0;
+ msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
+
+ hdr = (struct w1_netlink_msg *)(msg + 1);
+ cmd = (struct w1_netlink_cmd *)(hdr + 1);
+
+ hdr->type = W1_MASTER_CMD;
+ hdr->id = req_hdr->id;
+ hdr->len = sizeof(struct w1_netlink_cmd);
+
+ cmd->cmd = req_cmd->cmd;
+ cmd->len = 0;
+
+ switch (cmd->cmd) {
+ case W1_CMD_SEARCH:
+ case W1_CMD_ALARM_SEARCH:
+ err = w1_process_search_command(dev, msg,
+ PAGE_SIZE - msg->len - sizeof(struct cn_msg));
+ break;
+ case W1_CMD_READ:
+ case W1_CMD_WRITE:
+ case W1_CMD_TOUCH:
+ err = w1_process_command_io(dev, msg, hdr, cmd);
+ break;
+ default:
+ cmd->res = EINVAL;
+ cn_netlink_send(msg, 0, GFP_KERNEL);
+ break;
+ }
+
+ kfree(msg);
+ return err;
+}
+
+static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
+ struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
+{
+ dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
+ __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
+ sl->reg_num.crc, cmd->cmd, cmd->len);
+
+ return w1_process_command_io(sl->master, msg, hdr, cmd);
+}
+
static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd)
{
struct w1_master *m;
@@ -214,7 +226,7 @@ static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mc

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);
+ __func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len);
return -EPROTO;
}

--
1.5.6.3


\
 
 \ /
  Last update: 2008-12-16 19:11    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site