Commit 33a6b48a authored by Ji-Ze Hong (Peter Hong)'s avatar Ji-Ze Hong (Peter Hong) Committed by Johan Hovold
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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: default avatarJi-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
[johan: reword commit message and an error message slightly]
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
parent 615e58cc

drivers/usb/serial/f81232.c

+134 −1
Original line number Diff line number Diff line
@@ -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>");

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