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);
}
void gqti_ctrl_disconnect(void *gr, u8 port_num)
{
struct qti_ctrl_port *port;
unsigned long flags;
struct rmnet_ctrl_pkt *cpkt;
struct grmnet *g_rmnet = NULL;
struct gqdss *g_dpl = NULL;
pr_debug("%s: gadget:%p\n", __func__, gr);
if (port_num >= NR_QTI_PORTS) {
pr_err("%s: Invalid QTI port %d\n", __func__, port_num);
return;
}
port = ctrl_port[port_num];
if (!port) {
pr_err("%s: gadget port is null\n", __func__);
return;
}
atomic_set(&port->connected, 0);
atomic_set(&port->line_state, 0);
spin_lock_irqsave(&port->lock, flags);
/* reset ipa eps to -1 */
port->ipa_prod_idx = -1;
port->ipa_cons_idx = -1;
port->port_usb = NULL;
if (gr && port->gtype == USB_GADGET_RMNET) {
g_rmnet = (struct grmnet *)gr;
g_rmnet->send_encap_cmd = NULL;
g_rmnet->notify_modem = NULL;
} else if (gr && port->gtype == USB_GADGET_DPL) {
g_dpl = (struct gqdss *)gr;
g_dpl->send_encap_cmd = NULL;
g_dpl->notify_modem = NULL;
} else {
pr_err("%s(): unrecognized gadget type(%d).\n",
__func__, port->gtype);
}
while (!list_empty(&port->cpkt_req_q)) {
cpkt = list_first_entry(&port->cpkt_req_q,
struct rmnet_ctrl_pkt, list);
list_del(&cpkt->list);
free_rmnet_ctrl_pkt(cpkt);
}
spin_unlock_irqrestore(&port->lock, flags);
/* send 0 len pkt to qti to notify state change */
qti_ctrl_queue_notify(port);
}
static int gqti_ctrl_send_cpkt_tomodem(u8 portno, void *buf, size_t len)
{
unsigned long flags;
struct qti_ctrl_port *port;
struct rmnet_ctrl_pkt *cpkt;
if (len > MAX_QTI_PKT_SIZE) {
pr_err("given pkt size too big:%zu > max_pkt_size:%d\n",
len, MAX_QTI_PKT_SIZE);
return -EINVAL;
}
if (portno >= NR_QTI_PORTS) {
pr_err("%s: Invalid QTI port %d\n", __func__, portno);
return -ENODEV;
}
port = ctrl_port[portno];
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;
pr_debug("%s: gtype:%d: Add to cpkt_req_q packet with len = %zu\n",
__func__, port->gtype, len);
spin_lock_irqsave(&port->lock, flags);
/* drop cpkt if port is not open */
if (!port->is_open) {
pr_debug("rmnet file handler %p(index=%d) is not open",
port, port->index);
port->drp_cpkt_cnt++;
spin_unlock_irqrestore(&port->lock, flags);
free_rmnet_ctrl_pkt(cpkt);
return 0;
}
list_add_tail(&cpkt->list, &port->cpkt_req_q);
port->host_to_modem++;
spin_unlock_irqrestore(&port->lock, flags);
/* wakeup read thread */
pr_debug("%s: Wake up read queue", __func__);
wake_up(&port->read_wq);
return 0;
}
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;
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))
/* send dtr zero */
smd_tiocmset(c->ch, c->cbits_tomodem, ~c->cbits_tomodem);
if (c->ch) {
smd_close(c->ch);
c->ch = NULL;
}
}
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 (!is_legal_port_num(port_num)) {
pr_err("%s: Invalid port_num#%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);
}
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) && !waitqueue_active(&c->smd_wait_q))
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;
}
wake_up(&c->smd_wait_q);
}
void gqti_ctrl_disconnect(struct grmnet *gr, u8 port_num)
{
struct rmnet_ctrl_qti_port *port;
unsigned long flags;
struct rmnet_ctrl_pkt *cpkt;
pr_debug("%s: grmnet:%p\n", __func__, gr);
if (port_num >= NR_QTI_PORTS) {
pr_err("%s: Invalid QTI port %d\n", __func__, port_num);
return;
}
port = ctrl_port[port_num];
if (!gr || !port) {
pr_err("%s: grmnet port is null\n", __func__);
return;
}
if (port->port_usb && port->port_usb->disconnect)
port->port_usb->disconnect(port->port_usb);
atomic_set(&port->connected, 0);
atomic_set(&port->line_state, 0);
spin_lock_irqsave(&port->lock, flags);
port->port_usb = 0;
gr->send_encap_cmd = 0;
gr->notify_modem = 0;
while (!list_empty(&port->cpkt_req_q)) {
cpkt = list_first_entry(&port->cpkt_req_q,
struct rmnet_ctrl_pkt, list);
list_del(&cpkt->list);
free_rmnet_ctrl_pkt(cpkt);
}
spin_unlock_irqrestore(&port->lock, flags);
/* send 0 len pkt to qti to notify state change */
rmnet_ctrl_queue_notify(port);
}
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;
}
static ssize_t
qti_ctrl_read(struct file *fp, char __user *buf, size_t count, loff_t *pos)
{
struct qti_ctrl_port *port = container_of(fp->private_data,
struct qti_ctrl_port,
ctrl_device);
struct rmnet_ctrl_pkt *cpkt = NULL;
unsigned long flags;
int ret = 0;
pr_debug("%s: Enter(%zu)\n", __func__, count);
if (count > MAX_QTI_PKT_SIZE) {
pr_err("Buffer size is too big %zu, should be at most %d\n",
count, MAX_QTI_PKT_SIZE);
return -EINVAL;
}
if (qti_ctrl_lock(&port->read_excl)) {
pr_err("Previous reading is not finished yet\n");
return -EBUSY;
}
/* block until a new packet is available */
do {
spin_lock_irqsave(&port->lock, flags);
if (!list_empty(&port->cpkt_req_q))
break;
spin_unlock_irqrestore(&port->lock, flags);
pr_debug("%s: Requests list is empty. Wait.\n", __func__);
ret = wait_event_interruptible(port->read_wq,
!list_empty(&port->cpkt_req_q));
if (ret < 0) {
pr_debug("Waiting failed\n");
qti_ctrl_unlock(&port->read_excl);
return -ERESTARTSYS;
}
} while (1);
cpkt = list_first_entry(&port->cpkt_req_q, struct rmnet_ctrl_pkt,
list);
list_del(&cpkt->list);
spin_unlock_irqrestore(&port->lock, flags);
if (cpkt->len > count) {
pr_err("cpkt size too big:%d > buf size:%zu\n",
cpkt->len, count);
qti_ctrl_unlock(&port->read_excl);
free_rmnet_ctrl_pkt(cpkt);
return -ENOMEM;
}
pr_debug("%s: cpkt size:%d\n", __func__, cpkt->len);
qti_ctrl_unlock(&port->read_excl);
ret = copy_to_user(buf, cpkt->buf, cpkt->len);
if (ret) {
pr_err("copy_to_user failed: err %d\n", ret);
ret = -EFAULT;
} else {
pr_debug("%s: copied %d bytes to user\n", __func__, cpkt->len);
ret = cpkt->len;
}
free_rmnet_ctrl_pkt(cpkt);
return ret;
}
