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/*
* Copyright (C) ST-Ericsson SA 2010,2011
*
* Author: Chris Blair <chris.blair@stericsson.com> for ST-Ericsson
* based on shrm_protocol.c
*
* License terms: GNU General Public License (GPL) version 2
*
* U9500 <-> M6718 IPC protocol implementation using SPI:
* netlink related functionality
*/
#include <linux/netlink.h>
#include <linux/spi/spi.h>
#include <linux/modem/m6718_spi/modem_net.h>
#include <linux/modem/m6718_spi/modem_char.h>
#include "modem_protocol.h"
#include "modem_private.h"
#ifdef CONFIG_MODEM_M6718_SPI_ENABLE_FEATURE_MODEM_STATE
#include "modem_state.h"
#endif
static struct sock *netlink_sk;
struct modem_spi_dev *modem_dev;
#define MAX_PAYLOAD 1024
/*
* Netlink broadcast message values: this must correspond to those values
* expected by userspace for the appropriate message.
*/
enum netlink_msg_id {
NETLINK_MODEM_RESET = 1,
NETLINK_MODEM_QUERY_STATE,
NETLINK_USER_REQUEST_MODEM_RESET,
NETLINK_MODEM_STATUS_ONLINE,
NETLINK_MODEM_STATUS_OFFLINE
};
static void netlink_multicast_tasklet(unsigned long data)
{
struct sk_buff *skb;
struct nlmsghdr *nlh;
enum netlink_msg_id nlmsg = (enum netlink_msg_id)data;
if (netlink_sk == NULL) {
pr_err("could not send multicast, no socket\n");
return;
}
/* prepare netlink message */
skb = alloc_skb(NLMSG_SPACE(MAX_PAYLOAD), GFP_ATOMIC);
if (!skb) {
pr_err("failed to allocate socket buffer\n");
return;
}
if (nlmsg == NETLINK_MODEM_RESET)
modem_isa_reset(modem_dev);
nlh = (struct nlmsghdr *)skb->data;
nlh->nlmsg_len = NLMSG_SPACE(MAX_PAYLOAD);
nlh->nlmsg_pid = 0; /* from kernel */
nlh->nlmsg_flags = 0;
*(int *)NLMSG_DATA(nlh) = nlmsg;
skb_put(skb, MAX_PAYLOAD);
/* sender is in group 1<<0 */
NETLINK_CB(skb).pid = 0; /* from kernel */
/* to mcast group 1<<0 */
NETLINK_CB(skb).dst_group = 1;
/* multicast the message to all listening processes */
pr_debug("sending netlink multicast message %d\n", nlmsg);
netlink_broadcast(netlink_sk, skb, 0, 1, GFP_ATOMIC);
}
static void send_unicast(int dst_pid)
{
struct sk_buff *skb;
struct nlmsghdr *nlh;
if (netlink_sk == NULL) {
pr_err("could not send unicast, no socket\n");
return;
}
/* prepare the message for unicast */
skb = alloc_skb(NLMSG_SPACE(MAX_PAYLOAD), GFP_KERNEL);
if (!skb) {
pr_err("failed to allocate socket buffer\n");
return;
}
nlh = (struct nlmsghdr *)skb->data;
nlh->nlmsg_len = NLMSG_SPACE(MAX_PAYLOAD);
nlh->nlmsg_pid = 0; /* from kernel */
nlh->nlmsg_flags = 0;
if (modem_m6718_spi_is_boot_done()) {
pr_debug("sending netlink unicast message %d\n",
NETLINK_MODEM_STATUS_ONLINE);
*(int *)NLMSG_DATA(nlh) = NETLINK_MODEM_STATUS_ONLINE;
} else {
pr_debug("sending netlink unicast message %d\n",
NETLINK_MODEM_STATUS_OFFLINE);
*(int *)NLMSG_DATA(nlh) = NETLINK_MODEM_STATUS_OFFLINE;
}
skb_put(skb, MAX_PAYLOAD);
/* sender is in group 1<<0 */
NETLINK_CB(skb).pid = 0; /* from kernel */
NETLINK_CB(skb).dst_group = 0;
/* unicast the message to the querying process */
netlink_unicast(netlink_sk, skb, dst_pid, MSG_DONTWAIT);
}
static void netlink_receive(struct sk_buff *skb)
{
struct nlmsghdr *nlh = NULL;
int msg;
nlh = (struct nlmsghdr *)skb->data;
msg = *((int *)(NLMSG_DATA(nlh)));
switch (msg) {
case NETLINK_MODEM_QUERY_STATE:
send_unicast(nlh->nlmsg_pid);
break;
case NETLINK_USER_REQUEST_MODEM_RESET:
pr_info("user requested modem reset!\n");
#ifdef CONFIG_DEBUG_FS
if (l1_context.msr_disable) {
pr_info("MSR is disabled, ignoring reset request\n");
break;
}
#endif
#ifdef CONFIG_MODEM_M6718_SPI_ENABLE_FEATURE_MODEM_STATE
modem_state_force_reset();
#else
pr_err("modestate integration is not enabled in IPC, "
"unable to reset modem\n");
#endif
break;
default:
pr_debug("ignoring invalid netlink message\n");
break;
}
}
bool ipc_create_netlink_socket(struct ipc_link_context *context)
{
if (netlink_sk != NULL)
return true;
netlink_sk = netlink_kernel_create(NULL, NETLINK_MODEM, 1,
netlink_receive, NULL, THIS_MODULE);
if (netlink_sk == NULL) {
dev_err(&context->sdev->dev,
"failed to create netlink socket\n");
return false;
}
modem_dev = spi_get_drvdata(context->sdev);
return true;
}
DECLARE_TASKLET(modem_online_tasklet, netlink_multicast_tasklet,
NETLINK_MODEM_STATUS_ONLINE);
DECLARE_TASKLET(modem_reset_tasklet, netlink_multicast_tasklet,
NETLINK_MODEM_RESET);
void ipc_broadcast_modem_online(struct ipc_link_context *context)
{
dev_info(&context->sdev->dev, "broadcast modem online event!\n");
tasklet_schedule(&modem_online_tasklet);
}
void ipc_broadcast_modem_reset(struct ipc_link_context *context)
{
dev_info(&context->sdev->dev, "broadcast modem reset event!\n");
tasklet_schedule(&modem_reset_tasklet);
}
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