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usb: f_cdev: Handle the serial state properly

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Currently when dtr high is send by the host, dsr high should be
sent by the device by performing a term io to acm conversion.
But if dtr high is received twice, serial state which is converted
to acm signal is again converted, leading to serial state becoming
null. Fix this by clearing ACM bits from previous conversion before
performing uart to acm conversion.

Change-Id: Iaad3f200599f6bd4224db0c3987420cc022b34ef
Signed-off-by: Rohith Kollalsi <quic_rkollals@quicinc.com>
This commit is contained in:
Rohith Kollalsi 2021-11-22 16:27:03 +05:30 • committed by Gerrit - the friendly Code Review server
commit 08122aebc0
1 changed files with 15 additions and 8 deletions
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23
drivers/usb/gadget/function/f_cdev.c
View file

@ -358,21 +358,28 @@ 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)
static unsigned int convert_uart_sigs_to_acm(struct cserial *cser, unsigned int uart_sig)
{
unsigned int acm_sig = 0;
u16 state;
state = cser->serial_state;
/* Make sure that ACM bits from previous conversion are cleared */
state &= ~(ACM_CTRL_RI | ACM_CTRL_DCD | ACM_CTRL_DSR | ACM_CTRL_BRK);
/* should this needs to be in calling functions ??? */
uart_sig &= (TIOCM_RI | TIOCM_CD | TIOCM_DSR);
uart_sig &= (TIOCM_RI | TIOCM_CD | TIOCM_DSR | TIOCM_CTS);
if (uart_sig & TIOCM_RI)
acm_sig |= ACM_CTRL_RI;
state |= ACM_CTRL_RI;
if (uart_sig & TIOCM_CD)
acm_sig |= ACM_CTRL_DCD;
state |= ACM_CTRL_DCD;
if (uart_sig & TIOCM_DSR)
acm_sig |= ACM_CTRL_DSR;
state |= ACM_CTRL_DSR;
if (uart_sig & TIOCM_CTS)
state |= ACM_CTRL_BRK;
return acm_sig;
return state;
}
static unsigned int convert_acm_sigs_to_uart(unsigned int acm_sig)
@ -1660,7 +1667,7 @@ static void usb_cser_notify_modem(void *fport, int ctrl_bits)
unsigned int cbits_to_laptop;
result = f_cdev_tiocmget(port);
cbits_to_laptop = convert_uart_sigs_to_acm(result);
cbits_to_laptop = convert_uart_sigs_to_acm(cser, result);
if (cser->send_modem_ctrl_bits)
cser->send_modem_ctrl_bits(cser, cbits_to_laptop);
}