blob: 161634ebf134316bc91405b3ab2f6eb37d610914 [file] [log] [blame]
/*
* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/termios.h>
#include <mach/msm_smd.h>
#include <linux/debugfs.h>
#include <linux/bitops.h>
#include <linux/termios.h>
#include "u_rmnet.h"
#define NR_CTRL_SMD_PORTS 3
static int n_rmnet_ctrl_ports;
static char *rmnet_ctrl_names[] = {"DATA40_CNTL", "DATA39_CNTL", "DATA38_CNTL"};
static struct workqueue_struct *grmnet_ctrl_wq;
#define SMD_CH_MAX_LEN 20
#define CH_OPENED 0
#define CH_READY 1
#define CH_PREPARE_READY 2
struct smd_ch_info {
struct smd_channel *ch;
char *name;
unsigned long flags;
wait_queue_head_t wait;
unsigned dtr;
struct list_head tx_q;
unsigned long tx_len;
struct work_struct read_w;
struct work_struct write_w;
struct rmnet_ctrl_port *port;
int cbits_tomodem;
/* stats */
unsigned long to_modem;
unsigned long to_host;
};
struct rmnet_ctrl_port {
struct smd_ch_info ctrl_ch;
unsigned int port_num;
struct grmnet *port_usb;
spinlock_t port_lock;
struct delayed_work connect_w;
struct delayed_work disconnect_w;
};
static struct rmnet_ctrl_ports {
struct rmnet_ctrl_port *port;
struct platform_driver pdrv;
} ctrl_smd_ports[NR_CTRL_SMD_PORTS];
/*---------------misc functions---------------- */
static struct rmnet_ctrl_pkt *alloc_rmnet_ctrl_pkt(unsigned len, gfp_t flags)
{
struct rmnet_ctrl_pkt *pkt;
pkt = kzalloc(sizeof(struct rmnet_ctrl_pkt), flags);
if (!pkt)
return ERR_PTR(-ENOMEM);
pkt->buf = kmalloc(len, flags);
if (!pkt->buf) {
kfree(pkt);
return ERR_PTR(-ENOMEM);
}
pkt->len = len;
return pkt;
}
static void free_rmnet_ctrl_pkt(struct rmnet_ctrl_pkt *pkt)
{
kfree(pkt->buf);
kfree(pkt);
}
/*--------------------------------------------- */
/*---------------control/smd channel functions---------------- */
static void grmnet_ctrl_smd_read_w(struct work_struct *w)
{
struct smd_ch_info *c = container_of(w, struct smd_ch_info, read_w);
struct rmnet_ctrl_port *port = c->port;
int sz;
size_t len;
void *buf;
unsigned long flags;
spin_lock_irqsave(&port->port_lock, flags);
while (c->ch) {
sz = smd_cur_packet_size(c->ch);
if (sz <= 0)
break;
if (smd_read_avail(c->ch) < sz)
break;
spin_unlock_irqrestore(&port->port_lock, flags);
buf = kmalloc(sz, GFP_KERNEL);
if (!buf)
return;
len = smd_read(c->ch, buf, sz);
/* send it to USB here */
spin_lock_irqsave(&port->port_lock, flags);
if (port->port_usb && port->port_usb->send_cpkt_response) {
port->port_usb->send_cpkt_response(port->port_usb,
buf, len);
c->to_host++;
}
kfree(buf);
}
spin_unlock_irqrestore(&port->port_lock, flags);
}
static void grmnet_ctrl_smd_write_w(struct work_struct *w)
{
struct smd_ch_info *c = container_of(w, struct smd_ch_info, write_w);
struct rmnet_ctrl_port *port = c->port;
unsigned long flags;
struct rmnet_ctrl_pkt *cpkt;
int ret;
spin_lock_irqsave(&port->port_lock, flags);
while (c->ch) {
if (list_empty(&c->tx_q))
break;
cpkt = list_first_entry(&c->tx_q, struct rmnet_ctrl_pkt, list);
if (smd_write_avail(c->ch) < cpkt->len)
break;
list_del(&cpkt->list);
spin_unlock_irqrestore(&port->port_lock, flags);
ret = smd_write(c->ch, cpkt->buf, cpkt->len);
spin_lock_irqsave(&port->port_lock, flags);
if (ret != cpkt->len) {
pr_err("%s: smd_write failed err:%d\n", __func__, ret);
free_rmnet_ctrl_pkt(cpkt);
break;
}
free_rmnet_ctrl_pkt(cpkt);
c->to_modem++;
}
spin_unlock_irqrestore(&port->port_lock, flags);
}
static int
grmnet_ctrl_smd_send_cpkt_tomodem(u8 portno,
void *buf, size_t len)
{
unsigned long flags;
struct rmnet_ctrl_port *port;
struct smd_ch_info *c;
struct rmnet_ctrl_pkt *cpkt;
if (portno >= n_rmnet_ctrl_ports) {
pr_err("%s: Invalid portno#%d\n", __func__, portno);
return -ENODEV;
}
port = ctrl_smd_ports[portno].port;
cpkt = alloc_rmnet_ctrl_pkt(len, GFP_ATOMIC);
if (IS_ERR(cpkt)) {
pr_err("%s: Unable to allocate ctrl pkt\n", __func__);
return -ENOMEM;
}
memcpy(cpkt->buf, buf, len);
cpkt->len = len;
spin_lock_irqsave(&port->port_lock, flags);
c = &port->ctrl_ch;
/* drop cpkt if ch is not open */
if (!test_bit(CH_OPENED, &c->flags)) {
free_rmnet_ctrl_pkt(cpkt);
spin_unlock_irqrestore(&port->port_lock, flags);
return 0;
}
list_add_tail(&cpkt->list, &c->tx_q);
queue_work(grmnet_ctrl_wq, &c->write_w);
spin_unlock_irqrestore(&port->port_lock, flags);
return 0;
}
#define RMNET_CTRL_DTR 0x01
static void
gsmd_ctrl_send_cbits_tomodem(void *gptr, u8 portno, int cbits)
{
struct rmnet_ctrl_port *port;
struct smd_ch_info *c;
int set_bits = 0;
int clear_bits = 0;
int temp = 0;
if (portno >= n_rmnet_ctrl_ports) {
pr_err("%s: Invalid portno#%d\n", __func__, portno);
return;
}
if (!gptr) {
pr_err("%s: grmnet is null\n", __func__);
return;
}
port = ctrl_smd_ports[portno].port;
cbits = cbits & RMNET_CTRL_DTR;
c = &port->ctrl_ch;
/* host driver will only send DTR, but to have generic
* set and clear bit implementation using two separate
* checks
*/
if (cbits & RMNET_CTRL_DTR)
set_bits |= TIOCM_DTR;
else
clear_bits |= TIOCM_DTR;
temp |= set_bits;
temp &= ~clear_bits;
if (temp == c->cbits_tomodem)
return;
c->cbits_tomodem = temp;
if (!test_bit(CH_OPENED, &c->flags))
return;
pr_debug("%s: ctrl_tomodem:%d ctrl_bits:%d setbits:%d clearbits:%d\n",
__func__, temp, cbits, set_bits, clear_bits);
smd_tiocmset(c->ch, set_bits, clear_bits);
}
static char *get_smd_event(unsigned event)
{
switch (event) {
case SMD_EVENT_DATA:
return "DATA";
case SMD_EVENT_OPEN:
return "OPEN";
case SMD_EVENT_CLOSE:
return "CLOSE";
}
return "UNDEFINED";
}
static void grmnet_ctrl_smd_notify(void *p, unsigned event)
{
struct rmnet_ctrl_port *port = p;
struct smd_ch_info *c = &port->ctrl_ch;
struct rmnet_ctrl_pkt *cpkt;
unsigned long flags;
pr_debug("%s: EVENT_(%s)\n", __func__, get_smd_event(event));
switch (event) {
case SMD_EVENT_DATA:
if (smd_read_avail(c->ch))
queue_work(grmnet_ctrl_wq, &c->read_w);
if (smd_write_avail(c->ch))
queue_work(grmnet_ctrl_wq, &c->write_w);
break;
case SMD_EVENT_OPEN:
set_bit(CH_OPENED, &c->flags);
if (port && port->port_usb && port->port_usb->connect)
port->port_usb->connect(port->port_usb);
break;
case SMD_EVENT_CLOSE:
clear_bit(CH_OPENED, &c->flags);
if (port && port->port_usb && port->port_usb->disconnect)
port->port_usb->disconnect(port->port_usb);
spin_lock_irqsave(&port->port_lock, flags);
while (!list_empty(&c->tx_q)) {
cpkt = list_first_entry(&c->tx_q,
struct rmnet_ctrl_pkt, list);
list_del(&cpkt->list);
free_rmnet_ctrl_pkt(cpkt);
}
spin_unlock_irqrestore(&port->port_lock, flags);
break;
}
}
/*------------------------------------------------------------ */
static void grmnet_ctrl_smd_connect_w(struct work_struct *w)
{
struct rmnet_ctrl_port *port =
container_of(w, struct rmnet_ctrl_port, connect_w.work);
struct rmnet_ctrl_ports *port_entry = &ctrl_smd_ports[port->port_num];
struct smd_ch_info *c = &port->ctrl_ch;
unsigned long flags;
int set_bits = 0;
int clear_bits = 0;
int ret;
pr_debug("%s:\n", __func__);
if (!test_bit(CH_READY, &c->flags)) {
if (!test_bit(CH_PREPARE_READY, &c->flags)) {
set_bit(CH_PREPARE_READY, &c->flags);
platform_driver_register(&(port_entry->pdrv));
}
return;
}
ret = smd_open(c->name, &c->ch, port, grmnet_ctrl_smd_notify);
if (ret) {
if (ret == -EAGAIN) {
/* port not ready - retry */
pr_debug("%s: SMD port not ready - rescheduling:%s err:%d\n",
__func__, c->name, ret);
queue_delayed_work(grmnet_ctrl_wq, &port->connect_w,
msecs_to_jiffies(250));
} else {
pr_err("%s: unable to open smd port:%s err:%d\n",
__func__, c->name, ret);
}
return;
}
set_bits = c->cbits_tomodem;
clear_bits = ~(c->cbits_tomodem | TIOCM_RTS);
spin_lock_irqsave(&port->port_lock, flags);
if (port->port_usb)
smd_tiocmset(c->ch, set_bits, clear_bits);
spin_unlock_irqrestore(&port->port_lock, flags);
}
int gsmd_ctrl_connect(struct grmnet *gr, int port_num)
{
struct rmnet_ctrl_port *port;
struct smd_ch_info *c;
unsigned long flags;
pr_debug("%s: grmnet:%p port#%d\n", __func__, gr, port_num);
if (port_num >= n_rmnet_ctrl_ports) {
pr_err("%s: invalid portno#%d\n", __func__, port_num);
return -ENODEV;
}
if (!gr) {
pr_err("%s: grmnet port is null\n", __func__);
return -ENODEV;
}
port = ctrl_smd_ports[port_num].port;
c = &port->ctrl_ch;
spin_lock_irqsave(&port->port_lock, flags);
port->port_usb = gr;
gr->send_encap_cmd = grmnet_ctrl_smd_send_cpkt_tomodem;
gr->notify_modem = gsmd_ctrl_send_cbits_tomodem;
spin_unlock_irqrestore(&port->port_lock, flags);
queue_delayed_work(grmnet_ctrl_wq, &port->connect_w, 0);
return 0;
}
static void grmnet_ctrl_smd_disconnect_w(struct work_struct *w)
{
struct rmnet_ctrl_port *port =
container_of(w, struct rmnet_ctrl_port,
disconnect_w.work);
struct smd_ch_info *c;
struct platform_driver *pdrv;
c = &port->ctrl_ch;
if (c->ch) {
smd_close(c->ch);
c->ch = NULL;
}
if (test_bit(CH_READY, &c->flags) ||
test_bit(CH_PREPARE_READY, &c->flags)) {
clear_bit(CH_PREPARE_READY, &c->flags);
pdrv = &ctrl_smd_ports[port->port_num].pdrv;
platform_driver_unregister(pdrv);
}
}
void gsmd_ctrl_disconnect(struct grmnet *gr, u8 port_num)
{
struct rmnet_ctrl_port *port;
unsigned long flags;
struct smd_ch_info *c;
struct rmnet_ctrl_pkt *cpkt;
int clear_bits;
pr_debug("%s: grmnet:%p port#%d\n", __func__, gr, port_num);
if (port_num >= n_rmnet_ctrl_ports) {
pr_err("%s: invalid portno#%d\n", __func__, port_num);
return;
}
if (!gr) {
pr_err("%s: grmnet port is null\n", __func__);
return;
}
port = ctrl_smd_ports[port_num].port;
c = &port->ctrl_ch;
spin_lock_irqsave(&port->port_lock, flags);
port->port_usb = 0;
gr->send_encap_cmd = 0;
gr->notify_modem = 0;
c->cbits_tomodem = 0;
while (!list_empty(&c->tx_q)) {
cpkt = list_first_entry(&c->tx_q, struct rmnet_ctrl_pkt, list);
list_del(&cpkt->list);
free_rmnet_ctrl_pkt(cpkt);
}
spin_unlock_irqrestore(&port->port_lock, flags);
if (test_and_clear_bit(CH_OPENED, &c->flags)) {
clear_bits = ~(c->cbits_tomodem | TIOCM_RTS);
/* send dtr zero */
smd_tiocmset(c->ch, c->cbits_tomodem, clear_bits);
}
queue_delayed_work(grmnet_ctrl_wq, &port->disconnect_w, 0);
}
#define SMD_CH_MAX_LEN 20
static int grmnet_ctrl_smd_ch_probe(struct platform_device *pdev)
{
struct rmnet_ctrl_port *port;
struct smd_ch_info *c;
int i;
unsigned long flags;
pr_debug("%s: name:%s\n", __func__, pdev->name);
for (i = 0; i < n_rmnet_ctrl_ports; i++) {
port = ctrl_smd_ports[i].port;
c = &port->ctrl_ch;
if (!strncmp(c->name, pdev->name, SMD_CH_MAX_LEN)) {
clear_bit(CH_PREPARE_READY, &c->flags);
set_bit(CH_READY, &c->flags);
/* if usb is online, try opening smd_ch */
spin_lock_irqsave(&port->port_lock, flags);
if (port->port_usb)
queue_delayed_work(grmnet_ctrl_wq,
&port->connect_w, 0);
spin_unlock_irqrestore(&port->port_lock, flags);
break;
}
}
return 0;
}
static int grmnet_ctrl_smd_ch_remove(struct platform_device *pdev)
{
struct rmnet_ctrl_port *port;
struct smd_ch_info *c;
int i;
pr_debug("%s: name:%s\n", __func__, pdev->name);
for (i = 0; i < n_rmnet_ctrl_ports; i++) {
port = ctrl_smd_ports[i].port;
c = &port->ctrl_ch;
if (!strncmp(c->name, pdev->name, SMD_CH_MAX_LEN)) {
clear_bit(CH_READY, &c->flags);
clear_bit(CH_OPENED, &c->flags);
if (c->ch) {
smd_close(c->ch);
c->ch = NULL;
}
break;
}
}
return 0;
}
static void grmnet_ctrl_smd_port_free(int portno)
{
struct rmnet_ctrl_port *port = ctrl_smd_ports[portno].port;
struct platform_driver *pdrv = &ctrl_smd_ports[portno].pdrv;
if (port) {
kfree(port);
platform_driver_unregister(pdrv);
}
}
static int grmnet_ctrl_smd_port_alloc(int portno)
{
struct rmnet_ctrl_port *port;
struct smd_ch_info *c;
struct platform_driver *pdrv;
port = kzalloc(sizeof(struct rmnet_ctrl_port), GFP_KERNEL);
if (!port)
return -ENOMEM;
port->port_num = portno;
spin_lock_init(&port->port_lock);
INIT_DELAYED_WORK(&port->connect_w, grmnet_ctrl_smd_connect_w);
INIT_DELAYED_WORK(&port->disconnect_w, grmnet_ctrl_smd_disconnect_w);
c = &port->ctrl_ch;
c->name = rmnet_ctrl_names[portno];
c->port = port;
init_waitqueue_head(&c->wait);
INIT_LIST_HEAD(&c->tx_q);
INIT_WORK(&c->read_w, grmnet_ctrl_smd_read_w);
INIT_WORK(&c->write_w, grmnet_ctrl_smd_write_w);
ctrl_smd_ports[portno].port = port;
pdrv = &ctrl_smd_ports[portno].pdrv;
pdrv->probe = grmnet_ctrl_smd_ch_probe;
pdrv->remove = grmnet_ctrl_smd_ch_remove;
pdrv->driver.name = c->name;
pdrv->driver.owner = THIS_MODULE;
pr_debug("%s: port:%p portno:%d\n", __func__, port, portno);
return 0;
}
int gsmd_ctrl_setup(unsigned int count)
{
int i;
int ret;
pr_debug("%s: requested ports:%d\n", __func__, count);
if (!count || count > NR_CTRL_SMD_PORTS) {
pr_err("%s: Invalid num of ports count:%d\n",
__func__, count);
return -EINVAL;
}
grmnet_ctrl_wq = alloc_workqueue("gsmd_ctrl",
WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
if (!grmnet_ctrl_wq) {
pr_err("%s: Unable to create workqueue grmnet_ctrl\n",
__func__);
return -ENOMEM;
}
for (i = 0; i < count; i++) {
n_rmnet_ctrl_ports++;
ret = grmnet_ctrl_smd_port_alloc(i);
if (ret) {
pr_err("%s: Unable to alloc port:%d\n", __func__, i);
n_rmnet_ctrl_ports--;
goto free_ctrl_smd_ports;
}
}
return 0;
free_ctrl_smd_ports:
for (i = 0; i < n_rmnet_ctrl_ports; i++)
grmnet_ctrl_smd_port_free(i);
destroy_workqueue(grmnet_ctrl_wq);
return ret;
}
#if defined(CONFIG_DEBUG_FS)
#define DEBUG_BUF_SIZE 1024
static ssize_t gsmd_ctrl_read_stats(struct file *file, char __user *ubuf,
size_t count, loff_t *ppos)
{
struct rmnet_ctrl_port *port;
struct smd_ch_info *c;
char *buf;
unsigned long flags;
int ret;
int i;
int temp = 0;
buf = kzalloc(sizeof(char) * DEBUG_BUF_SIZE, GFP_KERNEL);
if (!buf)
return -ENOMEM;
for (i = 0; i < n_rmnet_ctrl_ports; i++) {
port = ctrl_smd_ports[i].port;
if (!port)
continue;
spin_lock_irqsave(&port->port_lock, flags);
c = &port->ctrl_ch;
temp += scnprintf(buf + temp, DEBUG_BUF_SIZE - temp,
"#PORT:%d port:%p ctrl_ch:%p#\n"
"to_usbhost: %lu\n"
"to_modem: %lu\n"
"DTR: %s\n"
"ch_open: %d\n"
"ch_ready: %d\n"
"read_avail: %d\n"
"write_avail:%d\n",
i, port, &port->ctrl_ch,
c->to_host, c->to_modem,
c->cbits_tomodem ? "HIGH" : "LOW",
test_bit(CH_OPENED, &c->flags),
test_bit(CH_READY, &c->flags),
c->ch ? smd_read_avail(c->ch) : 0,
c->ch ? smd_write_avail(c->ch) : 0);
spin_unlock_irqrestore(&port->port_lock, flags);
}
ret = simple_read_from_buffer(ubuf, count, ppos, buf, temp);
kfree(buf);
return ret;
}
static ssize_t gsmd_ctrl_reset_stats(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct rmnet_ctrl_port *port;
struct smd_ch_info *c;
int i;
unsigned long flags;
for (i = 0; i < n_rmnet_ctrl_ports; i++) {
port = ctrl_smd_ports[i].port;
if (!port)
continue;
spin_lock_irqsave(&port->port_lock, flags);
c = &port->ctrl_ch;
c->to_host = 0;
c->to_modem = 0;
spin_unlock_irqrestore(&port->port_lock, flags);
}
return count;
}
const struct file_operations gsmd_ctrl_stats_ops = {
.read = gsmd_ctrl_read_stats,
.write = gsmd_ctrl_reset_stats,
};
struct dentry *smd_ctrl_dent;
struct dentry *smd_ctrl_dfile;
static void gsmd_ctrl_debugfs_init(void)
{
smd_ctrl_dent = debugfs_create_dir("usb_rmnet_ctrl_smd", 0);
if (IS_ERR(smd_ctrl_dent))
return;
smd_ctrl_dfile = debugfs_create_file("status", 0444, smd_ctrl_dent, 0,
&gsmd_ctrl_stats_ops);
if (!smd_ctrl_dfile || IS_ERR(smd_ctrl_dfile))
debugfs_remove(smd_ctrl_dent);
}
static void gsmd_ctrl_debugfs_exit(void)
{
debugfs_remove(smd_ctrl_dfile);
debugfs_remove(smd_ctrl_dent);
}
#else
static void gsmd_ctrl_debugfs_init(void) { }
static void gsmd_ctrl_debugfs_exit(void) { }
#endif
static int __init gsmd_ctrl_init(void)
{
gsmd_ctrl_debugfs_init();
return 0;
}
module_init(gsmd_ctrl_init);
static void __exit gsmd_ctrl_exit(void)
{
gsmd_ctrl_debugfs_exit();
}
module_exit(gsmd_ctrl_exit);
MODULE_DESCRIPTION("smd control driver");
MODULE_LICENSE("GPL v2");