Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 79419aed authored by Chandana Kishori Chiluveru's avatar Chandana Kishori Chiluveru Committed by Gerrit - the friendly Code Review server
Browse files

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



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: default avatarAjay Agarwal <ajaya@codeaurora.org>
Signed-off-by: default avatarChandana Kishori Chiluveru <cchiluve@codeaurora.org>
parent e6a3fce3

drivers/usb/gadget/function/f_cdev.c

+39 −0
Original line number Diff line number Diff line
@@ -348,6 +348,23 @@ 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;
@@ -1357,6 +1374,9 @@ 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;

}
@@ -1397,6 +1417,12 @@ 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;

}
@@ -1447,7 +1473,9 @@ 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;
@@ -1463,6 +1491,17 @@ 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);

}