439 lines
11 KiB
C
439 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Renesas Electronics uPD78F0730 USB to serial converter driver
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*
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* Copyright (C) 2014,2016 Maksim Salau <maksim.salau@gmail.com>
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*
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* Protocol of the adaptor is described in the application note U19660EJ1V0AN00
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* μPD78F0730 8-bit Single-Chip Microcontroller
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* USB-to-Serial Conversion Software
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* <https://www.renesas.com/en-eu/doc/DocumentServer/026/U19660EJ1V0AN00.pdf>
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*
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* The adaptor functionality is limited to the following:
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* - data bits: 7 or 8
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* - stop bits: 1 or 2
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* - parity: even, odd or none
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* - flow control: none
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* - baud rates: 0, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 153600
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* - signals: DTR, RTS and BREAK
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#define DRIVER_DESC "Renesas uPD78F0730 USB to serial converter driver"
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#define DRIVER_AUTHOR "Maksim Salau <maksim.salau@gmail.com>"
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(0x0409, 0x0063) }, /* V850ESJX3-STICK */
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{ USB_DEVICE(0x045B, 0x0212) }, /* YRPBRL78G13, YRPBRL78G14 */
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{ USB_DEVICE(0x064B, 0x7825) }, /* Analog Devices EVAL-ADXL362Z-DB */
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{}
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/*
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* Each adaptor is associated with a private structure, that holds the current
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* state of control signals (DTR, RTS and BREAK).
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*/
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struct upd78f0730_port_private {
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struct mutex lock; /* mutex to protect line_signals */
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u8 line_signals;
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};
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/* Op-codes of control commands */
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#define UPD78F0730_CMD_LINE_CONTROL 0x00
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#define UPD78F0730_CMD_SET_DTR_RTS 0x01
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#define UPD78F0730_CMD_SET_XON_XOFF_CHR 0x02
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#define UPD78F0730_CMD_OPEN_CLOSE 0x03
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#define UPD78F0730_CMD_SET_ERR_CHR 0x04
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/* Data sizes in UPD78F0730_CMD_LINE_CONTROL command */
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#define UPD78F0730_DATA_SIZE_7_BITS 0x00
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#define UPD78F0730_DATA_SIZE_8_BITS 0x01
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#define UPD78F0730_DATA_SIZE_MASK 0x01
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/* Stop-bit modes in UPD78F0730_CMD_LINE_CONTROL command */
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#define UPD78F0730_STOP_BIT_1_BIT 0x00
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#define UPD78F0730_STOP_BIT_2_BIT 0x02
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#define UPD78F0730_STOP_BIT_MASK 0x02
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/* Parity modes in UPD78F0730_CMD_LINE_CONTROL command */
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#define UPD78F0730_PARITY_NONE 0x00
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#define UPD78F0730_PARITY_EVEN 0x04
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#define UPD78F0730_PARITY_ODD 0x08
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#define UPD78F0730_PARITY_MASK 0x0C
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/* Flow control modes in UPD78F0730_CMD_LINE_CONTROL command */
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#define UPD78F0730_FLOW_CONTROL_NONE 0x00
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#define UPD78F0730_FLOW_CONTROL_HW 0x10
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#define UPD78F0730_FLOW_CONTROL_SW 0x20
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#define UPD78F0730_FLOW_CONTROL_MASK 0x30
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/* Control signal bits in UPD78F0730_CMD_SET_DTR_RTS command */
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#define UPD78F0730_RTS 0x01
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#define UPD78F0730_DTR 0x02
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#define UPD78F0730_BREAK 0x04
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/* Port modes in UPD78F0730_CMD_OPEN_CLOSE command */
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#define UPD78F0730_PORT_CLOSE 0x00
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#define UPD78F0730_PORT_OPEN 0x01
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/* Error character substitution modes in UPD78F0730_CMD_SET_ERR_CHR command */
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#define UPD78F0730_ERR_CHR_DISABLED 0x00
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#define UPD78F0730_ERR_CHR_ENABLED 0x01
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/*
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* Declaration of command structures
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*/
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/* UPD78F0730_CMD_LINE_CONTROL command */
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struct upd78f0730_line_control {
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u8 opcode;
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__le32 baud_rate;
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u8 params;
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} __packed;
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/* UPD78F0730_CMD_SET_DTR_RTS command */
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struct upd78f0730_set_dtr_rts {
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u8 opcode;
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u8 params;
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};
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/* UPD78F0730_CMD_SET_XON_OFF_CHR command */
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struct upd78f0730_set_xon_xoff_chr {
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u8 opcode;
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u8 xon;
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u8 xoff;
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};
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/* UPD78F0730_CMD_OPEN_CLOSE command */
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struct upd78f0730_open_close {
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u8 opcode;
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u8 state;
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};
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/* UPD78F0730_CMD_SET_ERR_CHR command */
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struct upd78f0730_set_err_chr {
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u8 opcode;
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u8 state;
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u8 err_char;
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};
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static int upd78f0730_send_ctl(struct usb_serial_port *port,
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const void *data, int size)
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{
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struct usb_device *usbdev = port->serial->dev;
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void *buf;
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int res;
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if (size <= 0 || !data)
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return -EINVAL;
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buf = kmemdup(data, size, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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res = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x00,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
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0x0000, 0x0000, buf, size, USB_CTRL_SET_TIMEOUT);
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kfree(buf);
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if (res != size) {
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struct device *dev = &port->dev;
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dev_err(dev, "failed to send control request %02x: %d\n",
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*(u8 *)data, res);
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/* The maximum expected length of a transfer is 6 bytes */
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if (res >= 0)
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res = -EIO;
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return res;
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}
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return 0;
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}
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static int upd78f0730_port_probe(struct usb_serial_port *port)
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{
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struct upd78f0730_port_private *private;
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private = kzalloc(sizeof(*private), GFP_KERNEL);
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if (!private)
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return -ENOMEM;
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mutex_init(&private->lock);
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usb_set_serial_port_data(port, private);
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return 0;
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}
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static int upd78f0730_port_remove(struct usb_serial_port *port)
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{
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struct upd78f0730_port_private *private;
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private = usb_get_serial_port_data(port);
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mutex_destroy(&private->lock);
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kfree(private);
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return 0;
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}
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static int upd78f0730_tiocmget(struct tty_struct *tty)
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{
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struct device *dev = tty->dev;
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struct upd78f0730_port_private *private;
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struct usb_serial_port *port = tty->driver_data;
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int signals;
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int res;
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private = usb_get_serial_port_data(port);
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mutex_lock(&private->lock);
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signals = private->line_signals;
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mutex_unlock(&private->lock);
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res = ((signals & UPD78F0730_DTR) ? TIOCM_DTR : 0) |
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((signals & UPD78F0730_RTS) ? TIOCM_RTS : 0);
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dev_dbg(dev, "%s - res = %x\n", __func__, res);
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return res;
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}
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static int upd78f0730_tiocmset(struct tty_struct *tty,
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unsigned int set, unsigned int clear)
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{
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struct device *dev = tty->dev;
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struct usb_serial_port *port = tty->driver_data;
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struct upd78f0730_port_private *private;
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struct upd78f0730_set_dtr_rts request;
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int res;
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private = usb_get_serial_port_data(port);
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mutex_lock(&private->lock);
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if (set & TIOCM_DTR) {
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private->line_signals |= UPD78F0730_DTR;
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dev_dbg(dev, "%s - set DTR\n", __func__);
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}
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if (set & TIOCM_RTS) {
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private->line_signals |= UPD78F0730_RTS;
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dev_dbg(dev, "%s - set RTS\n", __func__);
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}
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if (clear & TIOCM_DTR) {
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private->line_signals &= ~UPD78F0730_DTR;
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dev_dbg(dev, "%s - clear DTR\n", __func__);
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}
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if (clear & TIOCM_RTS) {
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private->line_signals &= ~UPD78F0730_RTS;
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dev_dbg(dev, "%s - clear RTS\n", __func__);
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}
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request.opcode = UPD78F0730_CMD_SET_DTR_RTS;
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request.params = private->line_signals;
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res = upd78f0730_send_ctl(port, &request, sizeof(request));
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mutex_unlock(&private->lock);
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return res;
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}
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static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state)
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{
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struct device *dev = tty->dev;
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struct upd78f0730_port_private *private;
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struct usb_serial_port *port = tty->driver_data;
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struct upd78f0730_set_dtr_rts request;
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private = usb_get_serial_port_data(port);
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mutex_lock(&private->lock);
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if (break_state) {
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private->line_signals |= UPD78F0730_BREAK;
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dev_dbg(dev, "%s - set BREAK\n", __func__);
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} else {
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private->line_signals &= ~UPD78F0730_BREAK;
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dev_dbg(dev, "%s - clear BREAK\n", __func__);
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}
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request.opcode = UPD78F0730_CMD_SET_DTR_RTS;
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request.params = private->line_signals;
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upd78f0730_send_ctl(port, &request, sizeof(request));
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mutex_unlock(&private->lock);
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}
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static void upd78f0730_dtr_rts(struct usb_serial_port *port, int on)
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{
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struct tty_struct *tty = port->port.tty;
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unsigned int set = 0;
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unsigned int clear = 0;
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if (on)
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set = TIOCM_DTR | TIOCM_RTS;
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else
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clear = TIOCM_DTR | TIOCM_RTS;
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upd78f0730_tiocmset(tty, set, clear);
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}
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static speed_t upd78f0730_get_baud_rate(struct tty_struct *tty)
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{
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const speed_t baud_rate = tty_get_baud_rate(tty);
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static const speed_t supported[] = {
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0, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 153600
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};
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int i;
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for (i = ARRAY_SIZE(supported) - 1; i >= 0; i--) {
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if (baud_rate == supported[i])
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return baud_rate;
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}
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/* If the baud rate is not supported, switch to the default one */
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tty_encode_baud_rate(tty, 9600, 9600);
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return tty_get_baud_rate(tty);
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}
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static void upd78f0730_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port,
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struct ktermios *old_termios)
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{
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struct device *dev = &port->dev;
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struct upd78f0730_line_control request;
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speed_t baud_rate;
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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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upd78f0730_dtr_rts(port, 0);
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else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
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upd78f0730_dtr_rts(port, 1);
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baud_rate = upd78f0730_get_baud_rate(tty);
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request.opcode = UPD78F0730_CMD_LINE_CONTROL;
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request.baud_rate = cpu_to_le32(baud_rate);
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request.params = 0;
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dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud_rate);
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switch (C_CSIZE(tty)) {
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case CS7:
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request.params |= UPD78F0730_DATA_SIZE_7_BITS;
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dev_dbg(dev, "%s - 7 data bits\n", __func__);
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break;
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default:
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tty->termios.c_cflag &= ~CSIZE;
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tty->termios.c_cflag |= CS8;
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dev_warn(dev, "data size is not supported, using 8 bits\n");
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/* fall through */
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case CS8:
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request.params |= UPD78F0730_DATA_SIZE_8_BITS;
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dev_dbg(dev, "%s - 8 data bits\n", __func__);
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break;
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}
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if (C_PARENB(tty)) {
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if (C_PARODD(tty)) {
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request.params |= UPD78F0730_PARITY_ODD;
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dev_dbg(dev, "%s - odd parity\n", __func__);
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} else {
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request.params |= UPD78F0730_PARITY_EVEN;
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dev_dbg(dev, "%s - even parity\n", __func__);
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}
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if (C_CMSPAR(tty)) {
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tty->termios.c_cflag &= ~CMSPAR;
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dev_warn(dev, "MARK/SPACE parity is not supported\n");
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}
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} else {
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request.params |= UPD78F0730_PARITY_NONE;
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dev_dbg(dev, "%s - no parity\n", __func__);
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}
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if (C_CSTOPB(tty)) {
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request.params |= UPD78F0730_STOP_BIT_2_BIT;
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dev_dbg(dev, "%s - 2 stop bits\n", __func__);
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} else {
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request.params |= UPD78F0730_STOP_BIT_1_BIT;
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dev_dbg(dev, "%s - 1 stop bit\n", __func__);
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}
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if (C_CRTSCTS(tty)) {
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tty->termios.c_cflag &= ~CRTSCTS;
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dev_warn(dev, "RTSCTS flow control is not supported\n");
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}
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if (I_IXOFF(tty) || I_IXON(tty)) {
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tty->termios.c_iflag &= ~(IXOFF | IXON);
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dev_warn(dev, "XON/XOFF flow control is not supported\n");
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}
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request.params |= UPD78F0730_FLOW_CONTROL_NONE;
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dev_dbg(dev, "%s - no flow control\n", __func__);
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upd78f0730_send_ctl(port, &request, sizeof(request));
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}
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static int upd78f0730_open(struct tty_struct *tty, struct usb_serial_port *port)
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{
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static const struct upd78f0730_open_close request = {
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.opcode = UPD78F0730_CMD_OPEN_CLOSE,
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.state = UPD78F0730_PORT_OPEN
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};
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int res;
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res = upd78f0730_send_ctl(port, &request, sizeof(request));
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if (res)
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return res;
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if (tty)
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upd78f0730_set_termios(tty, port, NULL);
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return usb_serial_generic_open(tty, port);
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}
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static void upd78f0730_close(struct usb_serial_port *port)
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{
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static const struct upd78f0730_open_close request = {
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.opcode = UPD78F0730_CMD_OPEN_CLOSE,
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.state = UPD78F0730_PORT_CLOSE
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};
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usb_serial_generic_close(port);
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upd78f0730_send_ctl(port, &request, sizeof(request));
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}
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static struct usb_serial_driver upd78f0730_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "upd78f0730",
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},
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.id_table = id_table,
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.num_ports = 1,
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.port_probe = upd78f0730_port_probe,
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.port_remove = upd78f0730_port_remove,
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.open = upd78f0730_open,
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.close = upd78f0730_close,
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.set_termios = upd78f0730_set_termios,
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.tiocmget = upd78f0730_tiocmget,
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.tiocmset = upd78f0730_tiocmset,
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.dtr_rts = upd78f0730_dtr_rts,
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.break_ctl = upd78f0730_break_ctl,
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};
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static struct usb_serial_driver * const serial_drivers[] = {
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&upd78f0730_device,
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NULL
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};
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module_usb_serial_driver(serial_drivers, id_table);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_LICENSE("GPL v2");
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