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usb: gadget: Send DSR linestate on DTR high from host

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When the host PC sends a DTR high during DUN call,
it expects to get a DSR signal from the modem in reply.
Add necessary support for that.

Change-Id: If46c4b75fa6210c2b15cd2880bc93461fa3a4e89
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>
This commit is contained in:
Chandana Kishori Chiluveru 2018-06-26 11:55:57 +05:30 • committed by Gerrit - the friendly Code Review server
commit 29d7fb35e0
1 changed files with 39 additions and 0 deletions
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39
drivers/usb/gadget/function/f_cdev.c
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@ -353,6 +353,23 @@ static inline struct f_cdev *cser_to_port(struct cserial *cser)
return container_of(cser, struct f_cdev, port_usb);
}
static unsigned int convert_uart_sigs_to_acm(unsigned int uart_sig)
{
unsigned int acm_sig = 0;
/* should this needs to be in calling functions ??? */
uart_sig &= (TIOCM_RI | TIOCM_CD | TIOCM_DSR);
if (uart_sig & TIOCM_RI)
acm_sig |= ACM_CTRL_RI;
if (uart_sig & TIOCM_CD)
acm_sig |= ACM_CTRL_DCD;
if (uart_sig & TIOCM_DSR)
acm_sig |= ACM_CTRL_DSR;
return acm_sig;
}
static unsigned int convert_acm_sigs_to_uart(unsigned int acm_sig)
{
unsigned int uart_sig = 0;
@ -1362,6 +1379,9 @@ static int f_cdev_tiocmget(struct f_cdev *port)
if (cser->serial_state & TIOCM_RI)
result |= TIOCM_RI;
if (cser->serial_state & TIOCM_DSR)
result |= TIOCM_DSR;
return result;
}
@ -1402,6 +1422,12 @@ static int f_cdev_tiocmset(struct f_cdev *port,
}
}
if (set & TIOCM_DSR)
cser->serial_state |= TIOCM_DSR;
if (clear & TIOCM_DSR)
cser->serial_state &= ~TIOCM_DSR;
return status;
}
@ -1452,7 +1478,9 @@ static void usb_cser_notify_modem(void *fport, int ctrl_bits)
{
int temp;
struct f_cdev *port = fport;
struct cserial *cser;
cser = &port->port_usb;
if (!port) {
pr_err("port is null\n");
return;
@ -1468,6 +1496,17 @@ static void usb_cser_notify_modem(void *fport, int ctrl_bits)
port->cbits_to_modem = temp;
port->cbits_updated = true;
/* if DTR is high, update latest modem info to laptop */
if (port->cbits_to_modem & TIOCM_DTR) {
unsigned int result;
unsigned int cbits_to_laptop;
result = f_cdev_tiocmget(port);
cbits_to_laptop = convert_uart_sigs_to_acm(result);
if (cser->send_modem_ctrl_bits)
cser->send_modem_ctrl_bits(cser, cbits_to_laptop);
}
wake_up(&port->read_wq);
}