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USB: serial: f81232: add control driver for F81534A 

The Fintek F81534A series contains 1 HUB, 1 GPIO device and n UARTs. The
UARTs are disabled by default and need to be enabled by the GPIO device
(2c42:16F8).

When F81534A plug to host, we can only see 1 HUB and 1 GPIO device and
we write 0x8fff to GPIO device register F81534A_CTRL_CMD_ENABLE_PORT
(116h) to enable all available serial ports.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
[johan: reword commit message and an error message slightly]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Ji-Ze Hong (Peter Hong) 2020-03-12 11:44:31 +08:00 committed by Johan Hovold
parent 615e58ccfb
commit 33a6b48a57
1 changed files with 134 additions and 1 deletions
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135
drivers/usb/serial/f81232.c
View File

@ -36,6 +36,9 @@
{ USB_DEVICE(0x2c42, 0x1635) }, /* 8 port UART device */ \
{ USB_DEVICE(0x2c42, 0x1636) } /* 12 port UART device */
#define F81534A_CTRL_ID \
{ USB_DEVICE(0x2c42, 0x16f8) } /* Global control device */
static const struct usb_device_id f81232_id_table[] = {
F81232_ID,
{ } /* Terminating entry */
@ -46,9 +49,15 @@ static const struct usb_device_id f81534a_id_table[] = {
{ } /* Terminating entry */
};
static const struct usb_device_id f81534a_ctrl_id_table[] = {
F81534A_CTRL_ID,
{ } /* Terminating entry */
};
static const struct usb_device_id combined_id_table[] = {
F81232_ID,
F81534A_SERIES_ID,
F81534A_CTRL_ID,
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, combined_id_table);
@ -61,6 +70,7 @@ MODULE_DEVICE_TABLE(usb, combined_id_table);
#define F81232_REGISTER_REQUEST 0xa0
#define F81232_GET_REGISTER 0xc0
#define F81232_SET_REGISTER 0x40
#define F81534A_ACCESS_REG_RETRY 2
#define SERIAL_BASE_ADDRESS 0x0120
#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
@ -101,6 +111,8 @@ MODULE_DEVICE_TABLE(usb, combined_id_table);
#define F81534A_GPIO_MODE1_OUTPUT BIT(1)
#define F81534A_GPIO_MODE0_OUTPUT BIT(0)
#define F81534A_CTRL_CMD_ENABLE_PORT 0x116
struct f81232_private {
struct mutex lock;
u8 modem_control;
@ -848,6 +860,93 @@ static void f81232_lsr_worker(struct work_struct *work)
dev_warn(&port->dev, "read LSR failed: %d\n", status);
}
static int f81534a_ctrl_set_register(struct usb_interface *intf, u16 reg,
u16 size, void *val)
{
struct usb_device *dev = interface_to_usbdev(intf);
int retry = F81534A_ACCESS_REG_RETRY;
int status;
u8 *tmp;
tmp = kmemdup(val, size, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
while (retry--) {
status = usb_control_msg(dev,
usb_sndctrlpipe(dev, 0),
F81232_REGISTER_REQUEST,
F81232_SET_REGISTER,
reg,
0,
tmp,
size,
USB_CTRL_SET_TIMEOUT);
if (status < 0) {
status = usb_translate_errors(status);
if (status == -EIO)
continue;
} else if (status != size) {
/* Retry on short transfers */
status = -EIO;
continue;
} else {
status = 0;
}
break;
}
if (status) {
dev_err(&intf->dev, "failed to set register 0x%x: %d\n",
reg, status);
}
kfree(tmp);
return status;
}
static int f81534a_ctrl_enable_all_ports(struct usb_interface *intf, bool en)
{
unsigned char enable[2] = {0};
int status;
/*
* Enable all available serial ports, define as following:
* bit 15 : Reset behavior (when HUB got soft reset)
* 0: maintain all serial port enabled state.
* 1: disable all serial port.
* bit 0~11 : Serial port enable bit.
*/
if (en) {
enable[0] = 0xff;
enable[1] = 0x8f;
}
status = f81534a_ctrl_set_register(intf, F81534A_CTRL_CMD_ENABLE_PORT,
sizeof(enable), enable);
if (status)
dev_err(&intf->dev, "failed to enable ports: %d\n", status);
return status;
}
static int f81534a_ctrl_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
return f81534a_ctrl_enable_all_ports(intf, true);
}
static void f81534a_ctrl_disconnect(struct usb_interface *intf)
{
f81534a_ctrl_enable_all_ports(intf, false);
}
static int f81534a_ctrl_resume(struct usb_interface *intf)
{
return f81534a_ctrl_enable_all_ports(intf, true);
}
static int f81232_port_probe(struct usb_serial_port *port)
{
struct f81232_private *priv;
@ -975,7 +1074,41 @@ static struct usb_serial_driver * const serial_drivers[] = {
NULL,
};
module_usb_serial_driver(serial_drivers, combined_id_table);
static struct usb_driver f81534a_ctrl_driver = {
.name = "f81534a_ctrl",
.id_table = f81534a_ctrl_id_table,
.probe = f81534a_ctrl_probe,
.disconnect = f81534a_ctrl_disconnect,
.resume = f81534a_ctrl_resume,
};
static int __init f81232_init(void)
{
int status;
status = usb_register_driver(&f81534a_ctrl_driver, THIS_MODULE,
KBUILD_MODNAME);
if (status)
return status;
status = usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME,
combined_id_table);
if (status) {
usb_deregister(&f81534a_ctrl_driver);
return status;
}
return 0;
}
static void __exit f81232_exit(void)
{
usb_serial_deregister_drivers(serial_drivers);
usb_deregister(&f81534a_ctrl_driver);
}
module_init(f81232_init);
module_exit(f81232_exit);
MODULE_DESCRIPTION("Fintek F81232/532A/534A/535/536 USB to serial driver");
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");