path: root/drivers/usb/serial/f81232.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Fintek F81232 USB to serial adaptor driver
 * Fintek F81532A/534A/535/536 USB to 2/4/8/12 serial adaptor driver
 *
 * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
 * Copyright (C) 2012 Linux Foundation
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial_reg.h>

#define F81232_ID		\
	{ USB_DEVICE(0x1934, 0x0706) }	/* 1 port UART device */

#define F81534A_SERIES_ID	\
	{ USB_DEVICE(0x2c42, 0x1602) },	/* In-Box 2 port UART device */	\
	{ USB_DEVICE(0x2c42, 0x1604) },	/* In-Box 4 port UART device */	\
	{ USB_DEVICE(0x2c42, 0x1605) },	/* In-Box 8 port UART device */	\
	{ USB_DEVICE(0x2c42, 0x1606) },	/* In-Box 12 port UART device */ \
	{ USB_DEVICE(0x2c42, 0x1608) },	/* Non-Flash type */ \
	{ USB_DEVICE(0x2c42, 0x1632) },	/* 2 port UART device */ \
	{ USB_DEVICE(0x2c42, 0x1634) },	/* 4 port UART device */ \
	{ 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 */
};

static const struct usb_device_id f81534a_id_table[] = {
	F81534A_SERIES_ID,
	{ }					/* 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);

/* Maximum baudrate for F81232 */
#define F81232_MAX_BAUDRATE		1500000
#define F81232_DEF_BAUDRATE		9600

/* USB Control EP parameter */
#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)
#define INTERRUPT_ENABLE_REGISTER	(0x01 + SERIAL_BASE_ADDRESS)
#define FIFO_CONTROL_REGISTER		(0x02 + SERIAL_BASE_ADDRESS)
#define LINE_CONTROL_REGISTER		(0x03 + SERIAL_BASE_ADDRESS)
#define MODEM_CONTROL_REGISTER		(0x04 + SERIAL_BASE_ADDRESS)
#define LINE_STATUS_REGISTER		(0x05 + SERIAL_BASE_ADDRESS)
#define MODEM_STATUS_REGISTER		(0x06 + SERIAL_BASE_ADDRESS)

/*
 * F81232 Clock registers (106h)
 *
 * Bit1-0:	Clock source selector
 *			00: 1.846MHz.
 *			01: 18.46MHz.
 *			10: 24MHz.
 *			11: 14.77MHz.
 */
#define F81232_CLK_REGISTER		0x106
#define F81232_CLK_1_846_MHZ		0
#define F81232_CLK_18_46_MHZ		BIT(0)
#define F81232_CLK_24_MHZ		BIT(1)
#define F81232_CLK_14_77_MHZ		(BIT(1) | BIT(0))
#define F81232_CLK_MASK			GENMASK(1, 0)

#define F81534A_MODE_REG		0x107
#define F81534A_TRIGGER_MASK		GENMASK(3, 2)
#define F81534A_TRIGGER_MULTIPLE_4X	BIT(3)
#define F81534A_FIFO_128BYTE		(BIT(1) | BIT(0))

/* Serial port self GPIO control, 2bytes [control&output data][input data] */
#define F81534A_GPIO_REG		0x10e
#define F81534A_GPIO_MODE2_DIR		BIT(6) /* 1: input, 0: output */
#define F81534A_GPIO_MODE1_DIR		BIT(5)
#define F81534A_GPIO_MODE0_DIR		BIT(4)
#define F81534A_GPIO_MODE2_OUTPUT	BIT(2)
#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;
	u8 modem_status;
	u8 shadow_lcr;
	speed_t baud_base;
	struct work_struct lsr_work;
	struct work_struct interrupt_work;
	struct usb_serial_port *port;
};

static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 };
static u8 const clock_table[] = { F81232_CLK_1_846_MHZ, F81232_CLK_14_77_MHZ,
				F81232_CLK_18_46_MHZ, F81232_CLK_24_MHZ };

static int calc_baud_divisor(speed_t baudrate, speed_t clockrate)
{
	if (!baudrate)
		return 0;

	return DIV_ROUND_CLOSEST(clockrate, baudrate);
}

static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
{
	int status;
	u8 *tmp;
	struct usb_device *dev = port->serial->dev;

	tmp = kmalloc(sizeof(*val), GFP_KERNEL);
	if (!tmp)
		return -ENOMEM;

	status = usb_control_msg(dev,
				usb_rcvctrlpipe(dev, 0),
				F81232_REGISTER_REQUEST,
				F81232_GET_REGISTER,
				reg,
				0,
				tmp,
				sizeof(*val),
				USB_CTRL_GET_TIMEOUT);
	if (status != sizeof(*val)) {
		dev_err(&port->dev, "%s failed status: %d\n", __func__, status);

		if (status < 0)
			status = usb_translate_errors(status);
		else
			status = -EIO;
	} else {
		status = 0;
		*val = *tmp;
	}

	kfree(tmp);
	return status;
}

static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
{
	int status;
	u8 *tmp;
	struct usb_device *dev = port->serial->dev;

	tmp = kmalloc(sizeof(val), GFP_KERNEL);
	if (!tmp)
		return -ENOMEM;

	*tmp = val;

	status = usb_control_msg(dev,
				usb_sndctrlpipe(dev, 0),
				F81232_REGISTER_REQUEST,
				F81232_SET_REGISTER,
				reg,
				0,
				tmp,
				sizeof(val),
				USB_CTRL_SET_TIMEOUT);
	if (status != sizeof(val)) {
		dev_err(&port->dev, "%s failed status: %d\n", __func__, status);

		if (status < 0