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linux/drivers/usb/serial/upd78f0730.c
Johan Hovold 07125072b0 USB: serial: do not use tty class device for debugging 
Use the port struct device rather than tty class device for debugging.

Note that while USB serial doesn't support serdev yet (due to serdev not
handling hotplugging), serdev ttys do not have a corresponding class
device and would have been logged using a "(NULL device *):" prefix.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
2021-04-09 17:55:21 +02:00

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