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USB: serial: f81534: add H/W disable port support 

The F81532/534 can be disable port by manufacturer with
following H/W design.
    1: Connect DCD/DSR/CTS/RI pin to ground.
    2: Connect RX pin to ground.

In driver, we'll implements some detect method likes following:
    1: Read MSR.
    2: Turn MCR LOOP bit on, off and read LSR after delay with 60ms.
       It'll contain BREAK status in LSR.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Ji-Ze Hong (Peter Hong) 2018-01-11 14:47:19 +08:00 committed by Johan Hovold
parent f047d35782
commit bb543ca287
1 changed files with 81 additions and 0 deletions
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81
drivers/usb/serial/f81534.c
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@ -307,6 +307,20 @@ static int f81534_set_mask_register(struct usb_serial *serial, u16 reg,
return f81534_set_register(serial, reg, tmp);
}
static int f81534_set_phy_port_register(struct usb_serial *serial, int phy,
u16 reg, u8 data)
{
return f81534_set_register(serial, reg + F81534_UART_OFFSET * phy,
data);
}
static int f81534_get_phy_port_register(struct usb_serial *serial, int phy,
u16 reg, u8 *data)
{
return f81534_get_register(serial, reg + F81534_UART_OFFSET * phy,
data);
}
static int f81534_set_port_register(struct usb_serial_port *port, u16 reg,
u8 data)
{
@ -732,6 +746,70 @@ static int f81534_find_config_idx(struct usb_serial *serial, u8 *index)
return 0;
}
/*
* The F81532/534 will not report serial port to USB serial subsystem when
* H/W DCD/DSR/CTS/RI/RX pin connected to ground.
*
* To detect RX pin status, we'll enable MCR interal loopback, disable it and
* delayed for 60ms. It connected to ground If LSR register report UART_LSR_BI.
*/
static bool f81534_check_port_hw_disabled(struct usb_serial *serial, int phy)
{
int status;
u8 old_mcr;
u8 msr;
u8 lsr;
u8 msr_mask;
msr_mask = UART_MSR_DCD | UART_MSR_RI | UART_MSR_DSR | UART_MSR_CTS;
status = f81534_get_phy_port_register(serial, phy,
F81534_MODEM_STATUS_REG, &msr);
if (status)
return false;
if ((msr & msr_mask) != msr_mask)
return false;
status = f81534_set_phy_port_register(serial, phy,
F81534_FIFO_CONTROL_REG, UART_FCR_ENABLE_FIFO |
UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
if (status)
return false;
status = f81534_get_phy_port_register(serial, phy,
F81534_MODEM_CONTROL_REG, &old_mcr);
if (status)
return false;
status = f81534_set_phy_port_register(serial, phy,
F81534_MODEM_CONTROL_REG, UART_MCR_LOOP);
if (status)
return false;
status = f81534_set_phy_port_register(serial, phy,
F81534_MODEM_CONTROL_REG, 0x0);
if (status)
return false;
msleep(60);
status = f81534_get_phy_port_register(serial, phy,
F81534_LINE_STATUS_REG, &lsr);
if (status)
return false;
status = f81534_set_phy_port_register(serial, phy,
F81534_MODEM_CONTROL_REG, old_mcr);
if (status)
return false;
if ((lsr & UART_LSR_BI) == UART_LSR_BI)
return true;
return false;
}
/*
* We had 2 generation of F81532/534 IC. All has an internal storage.
*
@ -823,6 +901,9 @@ static int f81534_calc_num_ports(struct usb_serial *serial,
/* New style, find all possible ports */
for (i = 0; i < F81534_NUM_PORT; ++i) {
if (f81534_check_port_hw_disabled(serial, i))
serial_priv->conf_data[i] |= F81534_PORT_UNAVAILABLE;
if (serial_priv->conf_data[i] & F81534_PORT_UNAVAILABLE)
continue;