691 lines
15 KiB
C
691 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Fintek F81232 USB to serial adaptor driver
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*
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* Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
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* Copyright (C) 2012 Linux Foundation
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/serial.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/serial_reg.h>
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(0x1934, 0x0706) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/* Maximum baudrate for F81232 */
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#define F81232_MAX_BAUDRATE 115200
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/* USB Control EP parameter */
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#define F81232_REGISTER_REQUEST 0xa0
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#define F81232_GET_REGISTER 0xc0
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#define F81232_SET_REGISTER 0x40
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#define SERIAL_BASE_ADDRESS 0x0120
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#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
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#define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
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#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
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#define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
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#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
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#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
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struct f81232_private {
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struct mutex lock;
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u8 modem_control;
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u8 modem_status;
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struct work_struct interrupt_work;
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struct usb_serial_port *port;
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};
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static int calc_baud_divisor(speed_t baudrate)
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{
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return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate);
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}
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static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
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{
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int status;
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u8 *tmp;
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struct usb_device *dev = port->serial->dev;
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tmp = kmalloc(sizeof(*val), GFP_KERNEL);
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if (!tmp)
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return -ENOMEM;
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status = usb_control_msg(dev,
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usb_rcvctrlpipe(dev, 0),
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F81232_REGISTER_REQUEST,
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F81232_GET_REGISTER,
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reg,
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0,
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tmp,
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sizeof(*val),
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USB_CTRL_GET_TIMEOUT);
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if (status != sizeof(*val)) {
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dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
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if (status < 0)
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status = usb_translate_errors(status);
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else
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status = -EIO;
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} else {
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status = 0;
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*val = *tmp;
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}
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kfree(tmp);
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return status;
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}
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static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
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{
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int status;
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u8 *tmp;
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struct usb_device *dev = port->serial->dev;
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tmp = kmalloc(sizeof(val), GFP_KERNEL);
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if (!tmp)
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return -ENOMEM;
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*tmp = val;
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status = usb_control_msg(dev,
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usb_sndctrlpipe(dev, 0),
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F81232_REGISTER_REQUEST,
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F81232_SET_REGISTER,
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reg,
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0,
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tmp,
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sizeof(val),
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USB_CTRL_SET_TIMEOUT);
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if (status != sizeof(val)) {
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dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
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if (status < 0)
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status = usb_translate_errors(status);
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else
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status = -EIO;
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} else {
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status = 0;
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}
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kfree(tmp);
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return status;
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}
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static void f81232_read_msr(struct usb_serial_port *port)
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{
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int status;
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u8 current_msr;
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struct tty_struct *tty;
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struct f81232_private *priv = usb_get_serial_port_data(port);
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mutex_lock(&priv->lock);
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status = f81232_get_register(port, MODEM_STATUS_REGISTER,
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¤t_msr);
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if (status) {
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dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
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mutex_unlock(&priv->lock);
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return;
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}
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if (!(current_msr & UART_MSR_ANY_DELTA)) {
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mutex_unlock(&priv->lock);
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return;
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}
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priv->modem_status = current_msr;
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if (current_msr & UART_MSR_DCTS)
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port->icount.cts++;
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if (current_msr & UART_MSR_DDSR)
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port->icount.dsr++;
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if (current_msr & UART_MSR_TERI)
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port->icount.rng++;
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if (current_msr & UART_MSR_DDCD) {
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port->icount.dcd++;
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tty = tty_port_tty_get(&port->port);
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if (tty) {
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usb_serial_handle_dcd_change(port, tty,
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current_msr & UART_MSR_DCD);
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tty_kref_put(tty);
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}
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}
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wake_up_interruptible(&port->port.delta_msr_wait);
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mutex_unlock(&priv->lock);
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}
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static int f81232_set_mctrl(struct usb_serial_port *port,
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unsigned int set, unsigned int clear)
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{
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u8 val;
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int status;
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struct f81232_private *priv = usb_get_serial_port_data(port);
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if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
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return 0; /* no change */
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/* 'set' takes precedence over 'clear' */
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clear &= ~set;
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/* force enable interrupt with OUT2 */
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mutex_lock(&priv->lock);
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val = UART_MCR_OUT2 | priv->modem_control;
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if (clear & TIOCM_DTR)
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val &= ~UART_MCR_DTR;
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if (clear & TIOCM_RTS)
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val &= ~UART_MCR_RTS;
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if (set & TIOCM_DTR)
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val |= UART_MCR_DTR;
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if (set & TIOCM_RTS)
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val |= UART_MCR_RTS;
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dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
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val, priv->modem_control);
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status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
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if (status) {
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dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
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mutex_unlock(&priv->lock);
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return status;
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}
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priv->modem_control = val;
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mutex_unlock(&priv->lock);
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return 0;
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}
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static void f81232_update_line_status(struct usb_serial_port *port,
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unsigned char *data,
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size_t actual_length)
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{
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struct f81232_private *priv = usb_get_serial_port_data(port);
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if (!actual_length)
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return;
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switch (data[0] & 0x07) {
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case 0x00: /* msr change */
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dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
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schedule_work(&priv->interrupt_work);
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break;
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case 0x02: /* tx-empty */
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break;
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case 0x04: /* rx data available */
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break;
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case 0x06: /* lsr change */
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/* we can forget it. the LSR will read from bulk-in */
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dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
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break;
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}
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}
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static void f81232_read_int_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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unsigned char *data = urb->transfer_buffer;
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unsigned int actual_length = urb->actual_length;
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int status = urb->status;
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int retval;
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switch (status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
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__func__, status);
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return;
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default:
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dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
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__func__, status);
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goto exit;
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}
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usb_serial_debug_data(&port->dev, __func__,
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urb->actual_length, urb->transfer_buffer);
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f81232_update_line_status(port, data, actual_length);
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exit:
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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dev_err(&urb->dev->dev,
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"%s - usb_submit_urb failed with result %d\n",
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__func__, retval);
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}
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static void f81232_process_read_urb(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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unsigned char *data = urb->transfer_buffer;
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char tty_flag;
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unsigned int i;
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u8 lsr;
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/*
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* When opening the port we get a 1-byte packet with the current LSR,
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* which we discard.
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*/
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if ((urb->actual_length < 2) || (urb->actual_length % 2))
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return;
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/* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
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for (i = 0; i < urb->actual_length; i += 2) {
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tty_flag = TTY_NORMAL;
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lsr = data[i];
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if (lsr & UART_LSR_BRK_ERROR_BITS) {
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if (lsr & UART_LSR_BI) {
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tty_flag = TTY_BREAK;
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port->icount.brk++;
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usb_serial_handle_break(port);
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} else if (lsr & UART_LSR_PE) {
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tty_flag = TTY_PARITY;
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port->icount.parity++;
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} else if (lsr & UART_LSR_FE) {
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tty_flag = TTY_FRAME;
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port->icount.frame++;
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}
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if (lsr & UART_LSR_OE) {
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port->icount.overrun++;
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tty_insert_flip_char(&port->port, 0,
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TTY_OVERRUN);
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}
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}
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if (port->port.console && port->sysrq) {
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if (usb_serial_handle_sysrq_char(port, data[i + 1]))
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continue;
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}
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tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
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}
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tty_flip_buffer_push(&port->port);
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}
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static void f81232_break_ctl(struct tty_struct *tty, int break_state)
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{
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/* FIXME - Stubbed out for now */
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/*
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* break_state = -1 to turn on break, and 0 to turn off break
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* see drivers/char/tty_io.c to see it used.
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* last_set_data_urb_value NEVER has the break bit set in it.
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*/
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}
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static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate)
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{
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u8 lcr;
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int divisor;
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int status = 0;
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divisor = calc_baud_divisor(baudrate);
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status = f81232_get_register(port, LINE_CONTROL_REGISTER,
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&lcr); /* get LCR */
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if (status) {
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dev_err(&port->dev, "%s failed to get LCR: %d\n",
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__func__, status);
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return;
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}
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status = f81232_set_register(port, LINE_CONTROL_REGISTER,
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lcr | UART_LCR_DLAB); /* Enable DLAB */
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if (status) {
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dev_err(&port->dev, "%s failed to set DLAB: %d\n",
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__func__, status);
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return;
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}
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status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
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divisor & 0x00ff); /* low */
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if (status) {
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dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
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__func__, status);
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goto reapply_lcr;
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}
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status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
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(divisor & 0xff00) >> 8); /* high */
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if (status) {
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dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
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__func__, status);
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}
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reapply_lcr:
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status = f81232_set_register(port, LINE_CONTROL_REGISTER,
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lcr & ~UART_LCR_DLAB);
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if (status) {
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dev_err(&port->dev, "%s failed to set DLAB: %d\n",
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__func__, status);
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}
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}
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static int f81232_port_enable(struct usb_serial_port *port)
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{
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u8 val;
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int status;
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/* fifo on, trigger8, clear TX/RX*/
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val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
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UART_FCR_CLEAR_XMIT;
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status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
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if (status) {
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dev_err(&port->dev, "%s failed to set FCR: %d\n",
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__func__, status);
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return status;
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}
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/* MSR Interrupt only, LSR will read from Bulk-in odd byte */
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status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
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UART_IER_MSI);
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if (status) {
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dev_err(&port->dev, "%s failed to set IER: %d\n",
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__func__, status);
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return status;
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}
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return 0;
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}
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static int f81232_port_disable(struct usb_serial_port *port)
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{
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int status;
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status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
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if (status) {
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dev_err(&port->dev, "%s failed to set IER: %d\n",
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__func__, status);
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return status;
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}
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return 0;
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}
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static void f81232_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old_termios)
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{
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u8 new_lcr = 0;
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int status = 0;
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speed_t baudrate;
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/* Don't change anything if nothing has changed */
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if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
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return;
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if (C_BAUD(tty) == B0)
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f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
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else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
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f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
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baudrate = tty_get_baud_rate(tty);
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if (baudrate > 0) {
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if (baudrate > F81232_MAX_BAUDRATE) {
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baudrate = F81232_MAX_BAUDRATE;
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tty_encode_baud_rate(tty, baudrate, baudrate);
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}
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f81232_set_baudrate(port, baudrate);
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}
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if (C_PARENB(tty)) {
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new_lcr |= UART_LCR_PARITY;
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if (!C_PARODD(tty))
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new_lcr |= UART_LCR_EPAR;
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if (C_CMSPAR(tty))
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new_lcr |= UART_LCR_SPAR;
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}
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if (C_CSTOPB(tty))
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new_lcr |= UART_LCR_STOP;
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switch (C_CSIZE(tty)) {
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case CS5:
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new_lcr |= UART_LCR_WLEN5;
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break;
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case CS6:
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new_lcr |= UART_LCR_WLEN6;
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break;
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case CS7:
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new_lcr |= UART_LCR_WLEN7;
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break;
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default:
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case CS8:
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new_lcr |= UART_LCR_WLEN8;
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break;
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}
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status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
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if (status) {
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dev_err(&port->dev, "%s failed to set LCR: %d\n",
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__func__, status);
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}
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}
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static int f81232_tiocmget(struct tty_struct *tty)
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{
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int r;
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struct usb_serial_port *port = tty->driver_data;
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struct f81232_private *port_priv = usb_get_serial_port_data(port);
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u8 mcr, msr;
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/* force get current MSR changed state */
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f81232_read_msr(port);
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mutex_lock(&port_priv->lock);
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mcr = port_priv->modem_control;
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msr = port_priv->modem_status;
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mutex_unlock(&port_priv->lock);
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r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
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(mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
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(msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
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(msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
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(msr & UART_MSR_RI ? TIOCM_RI : 0) |
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(msr & UART_MSR_DSR ? TIOCM_DSR : 0);
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return r;
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}
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static int f81232_tiocmset(struct tty_struct *tty,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
|
|
return f81232_set_mctrl(port, set, clear);
|
|
}
|
|
|
|
static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
|
|
{
|
|
int result;
|
|
|
|
result = f81232_port_enable(port);
|
|
if (result)
|
|
return result;
|
|
|
|
/* Setup termios */
|
|
if (tty)
|
|
f81232_set_termios(tty, port, NULL);
|
|
|
|
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
|
|
if (result) {
|
|
dev_err(&port->dev, "%s - failed submitting interrupt urb,"
|
|
" error %d\n", __func__, result);
|
|
return result;
|
|
}
|
|
|
|
result = usb_serial_generic_open(tty, port);
|
|
if (result) {
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
return result;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void f81232_close(struct usb_serial_port *port)
|
|
{
|
|
f81232_port_disable(port);
|
|
usb_serial_generic_close(port);
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
}
|
|
|
|
static void f81232_dtr_rts(struct usb_serial_port *port, int on)
|
|
{
|
|
if (on)
|
|
f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
|
|
else
|
|
f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
|
|
}
|
|
|
|
static int f81232_carrier_raised(struct usb_serial_port *port)
|
|
{
|
|
u8 msr;
|
|
struct f81232_private *priv = usb_get_serial_port_data(port);
|
|
|
|
mutex_lock(&priv->lock);
|
|
msr = priv->modem_status;
|
|
mutex_unlock(&priv->lock);
|
|
|
|
if (msr & UART_MSR_DCD)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int f81232_get_serial_info(struct usb_serial_port *port,
|
|
unsigned long arg)
|
|
{
|
|
struct serial_struct ser;
|
|
|
|
memset(&ser, 0, sizeof(ser));
|
|
|
|
ser.type = PORT_16550A;
|
|
ser.line = port->minor;
|
|
ser.port = port->port_number;
|
|
ser.baud_base = F81232_MAX_BAUDRATE;
|
|
|
|
if (copy_to_user((void __user *)arg, &ser, sizeof(ser)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int f81232_ioctl(struct tty_struct *tty,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
|
|
switch (cmd) {
|
|
case TIOCGSERIAL:
|
|
return f81232_get_serial_info(port, arg);
|
|
default:
|
|
break;
|
|
}
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
static void f81232_interrupt_work(struct work_struct *work)
|
|
{
|
|
struct f81232_private *priv =
|
|
container_of(work, struct f81232_private, interrupt_work);
|
|
|
|
f81232_read_msr(priv->port);
|
|
}
|
|
|
|
static int f81232_port_probe(struct usb_serial_port *port)
|
|
{
|
|
struct f81232_private *priv;
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&priv->lock);
|
|
INIT_WORK(&priv->interrupt_work, f81232_interrupt_work);
|
|
|
|
usb_set_serial_port_data(port, priv);
|
|
|
|
port->port.drain_delay = 256;
|
|
priv->port = port;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int f81232_port_remove(struct usb_serial_port *port)
|
|
{
|
|
struct f81232_private *priv;
|
|
|
|
priv = usb_get_serial_port_data(port);
|
|
kfree(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct usb_serial_driver f81232_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "f81232",
|
|
},
|
|
.id_table = id_table,
|
|
.num_ports = 1,
|
|
.bulk_in_size = 256,
|
|
.bulk_out_size = 256,
|
|
.open = f81232_open,
|
|
.close = f81232_close,
|
|
.dtr_rts = f81232_dtr_rts,
|
|
.carrier_raised = f81232_carrier_raised,
|
|
.ioctl = f81232_ioctl,
|
|
.break_ctl = f81232_break_ctl,
|
|
.set_termios = f81232_set_termios,
|
|
.tiocmget = f81232_tiocmget,
|
|
.tiocmset = f81232_tiocmset,
|
|
.tiocmiwait = usb_serial_generic_tiocmiwait,
|
|
.process_read_urb = f81232_process_read_urb,
|
|
.read_int_callback = f81232_read_int_callback,
|
|
.port_probe = f81232_port_probe,
|
|
.port_remove = f81232_port_remove,
|
|
};
|
|
|
|
static struct usb_serial_driver * const serial_drivers[] = {
|
|
&f81232_device,
|
|
NULL,
|
|
};
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
|
|
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
|
|
MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
|
|
MODULE_LICENSE("GPL v2");
|