[mirror_ubuntu-artful-kernel.git] / drivers / usb / serial / upd78f0730.c

/*
 * Renesas Electronics uPD78F0730 USB to serial converter driver
 *
 * Copyright (C) 2014,2016 Maksim Salau <maksim.salau@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * 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
 * - 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(0x045B, 0x0212) }, /* YRPBRL78G13, YRPBRL78G14 */
	{ USB_DEVICE(0x0409, 0x0063) }, /* V850ESJX3-STICK */
	{}
};

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 != size) {
		struct device *dev = &port->dev;

		dev_err(dev, "failed to send control request %02x: %d\n",
			*(u8 *)data, res);
		/* The maximum expected length of a transfer is 6 bytes */
		if (res >= 0)
			res = -EIO;

		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 int 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);

	return 0;
}

static int upd78f0730_tiocmget(struct tty_struct *tty)
{
	struct device *dev = tty->dev;
	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(dev, "%s - res = %x\n", __func__, res);

	return res;
}

static int upd78f0730_tiocmset(struct tty_struct *tty,
			unsigned int set, unsigned int clear)
{
	struct device *dev = tty->dev;
	struct usb_serial_port *port = tty->driver_data;
	struct upd78f0730_port_private *private;
	struct upd78f0730_set_dtr_rts request;
	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 device *dev = tty->dev;
	struct upd78f0730_port_private *private;
	struct usb_serial_port *port = tty->driver_data;
	struct upd78f0730_set_dtr_rts request;

	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);
	const speed_t supported[] = {
		0, 2400, 4800, 9600, 19200, 38400, 57600, 115200
	};
	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");
		/* fall through */
	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)
{
	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)
{
	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");
Commit	Line	Data
ea534e0b MS	1	/*
	2	* Renesas Electronics uPD78F0730 USB to serial converter driver
	3	*
	4	* Copyright (C) 2014,2016 Maksim Salau <maksim.salau@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2
	8	* as published by the Free Software Foundation.
	9	*
	10	* Protocol of the adaptor is described in the application note U19660EJ1V0AN00
	11	* μPD78F0730 8-bit Single-Chip Microcontroller
	12	* USB-to-Serial Conversion Software
	13	* <https://www.renesas.com/en-eu/doc/DocumentServer/026/U19660EJ1V0AN00.pdf>
	14	*
	15	* The adaptor functionality is limited to the following:
	16	* - data bits: 7 or 8
	17	* - stop bits: 1 or 2
	18	* - parity: even, odd or none
	19	* - flow control: none
	20	* - baud rates: 0, 2400, 4800, 9600, 19200, 38400, 57600, 115200
	21	* - signals: DTR, RTS and BREAK
	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/slab.h>
	26	#include <linux/tty.h>
	27	#include <linux/usb.h>
	28	#include <linux/usb/serial.h>
	29
	30	#define DRIVER_DESC "Renesas uPD78F0730 USB to serial converter driver"
	31
	32	#define DRIVER_AUTHOR "Maksim Salau <maksim.salau@gmail.com>"
	33
	34	static const struct usb_device_id id_table[] = {
	35	{ USB_DEVICE(0x045B, 0x0212) }, /* YRPBRL78G13, YRPBRL78G14 */
	36	{ USB_DEVICE(0x0409, 0x0063) }, /* V850ESJX3-STICK */
	37	{}
	38	};
	39
	40	MODULE_DEVICE_TABLE(usb, id_table);
	41
	42	/*
	43	* Each adaptor is associated with a private structure, that holds the current
	44	* state of control signals (DTR, RTS and BREAK).
	45	*/
	46	struct upd78f0730_port_private {
	47	struct mutex lock; /* mutex to protect line_signals */
	48	u8 line_signals;
	49	};
	50
	51	/* Op-codes of control commands */
	52	#define UPD78F0730_CMD_LINE_CONTROL 0x00
	53	#define UPD78F0730_CMD_SET_DTR_RTS 0x01
	54	#define UPD78F0730_CMD_SET_XON_XOFF_CHR 0x02
	55	#define UPD78F0730_CMD_OPEN_CLOSE 0x03
	56	#define UPD78F0730_CMD_SET_ERR_CHR 0x04
	57
	58	/* Data sizes in UPD78F0730_CMD_LINE_CONTROL command */
	59	#define UPD78F0730_DATA_SIZE_7_BITS 0x00
	60	#define UPD78F0730_DATA_SIZE_8_BITS 0x01
	61	#define UPD78F0730_DATA_SIZE_MASK 0x01
	62
	63	/* Stop-bit modes in UPD78F0730_CMD_LINE_CONTROL command */
	64	#define UPD78F0730_STOP_BIT_1_BIT 0x00
65	#define UPD78F0730_STOP_BIT_2_BIT 0x02
66	#define UPD78F0730_STOP_BIT_MASK 0x02
67
68	/* Parity modes in UPD78F0730_CMD_LINE_CONTROL command */
69	#define UPD78F0730_PARITY_NONE 0x00
70	#define UPD78F0730_PARITY_EVEN 0x04
71	#define UPD78F0730_PARITY_ODD 0x08
72	#define UPD78F0730_PARITY_MASK 0x0C
73
74	/* Flow control modes in UPD78F0730_CMD_LINE_CONTROL command */
75	#define UPD78F0730_FLOW_CONTROL_NONE 0x00
76	#define UPD78F0730_FLOW_CONTROL_HW 0x10
77	#define UPD78F0730_FLOW_CONTROL_SW 0x20
78	#define UPD78F0730_FLOW_CONTROL_MASK 0x30
79
80	/* Control signal bits in UPD78F0730_CMD_SET_DTR_RTS command */
81	#define UPD78F0730_RTS 0x01
82	#define UPD78F0730_DTR 0x02
83	#define UPD78F0730_BREAK 0x04
84
85	/* Port modes in UPD78F0730_CMD_OPEN_CLOSE command */
86	#define UPD78F0730_PORT_CLOSE 0x00
87	#define UPD78F0730_PORT_OPEN 0x01
88
89	/* Error character substitution modes in UPD78F0730_CMD_SET_ERR_CHR command */
90	#define UPD78F0730_ERR_CHR_DISABLED 0x00
91	#define UPD78F0730_ERR_CHR_ENABLED 0x01
92
93	/*
94	* Declaration of command structures
95	*/
96
97	/* UPD78F0730_CMD_LINE_CONTROL command */
98	struct upd78f0730_line_control {
99	u8 opcode;
100	__le32 baud_rate;
101	u8 params;
102	} __packed;
103
104	/* UPD78F0730_CMD_SET_DTR_RTS command */
105	struct upd78f0730_set_dtr_rts {
106	u8 opcode;
107	u8 params;
108	};
109
110	/* UPD78F0730_CMD_SET_XON_OFF_CHR command */
111	struct upd78f0730_set_xon_xoff_chr {
112	u8 opcode;
113	u8 xon;
114	u8 xoff;
115	};
116
117	/* UPD78F0730_CMD_OPEN_CLOSE command */
118	struct upd78f0730_open_close {
119	u8 opcode;
120	u8 state;
121	};
122
123	/* UPD78F0730_CMD_SET_ERR_CHR command */
124	struct upd78f0730_set_err_chr {
125	u8 opcode;
126	u8 state;
127	u8 err_char;
128	};
129
130	static int upd78f0730_send_ctl(struct usb_serial_port *port,
131	const void *data, int size)
132	{
133	struct usb_device *usbdev = port->serial->dev;
134	void *buf;
135	int res;
136
137	if (size <= 0 \|\| !data)
138	return -EINVAL;
139
140	buf = kmemdup(data, size, GFP_KERNEL);
141	if (!buf)
142	return -ENOMEM;
143
144	res = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x00,
145	USB_TYPE_VENDOR \| USB_RECIP_DEVICE \| USB_DIR_OUT,
146	0x0000, 0x0000, buf, size, USB_CTRL_SET_TIMEOUT);
147
148	kfree(buf);
149
150	if (res != size) {
151	struct device *dev = &port->dev;
152
153	dev_err(dev, "failed to send control request %02x: %d\n",
154	(u8 )data, res);
155	/* The maximum expected length of a transfer is 6 bytes */
156	if (res >= 0)
157	res = -EIO;
158
159	return res;
160	}
161
162	return 0;
163	}
164
165	static int upd78f0730_port_probe(struct usb_serial_port *port)
166	{
167	struct upd78f0730_port_private *private;
168
169	private = kzalloc(sizeof(*private), GFP_KERNEL);
170	if (!private)
171	return -ENOMEM;
172
173	mutex_init(&private->lock);
174	usb_set_serial_port_data(port, private);
175
176	return 0;
177	}
178
179	static int upd78f0730_port_remove(struct usb_serial_port *port)
180	{
181	struct upd78f0730_port_private *private;
182
183	private = usb_get_serial_port_data(port);
184	mutex_destroy(&private->lock);
185	kfree(private);
186
187	return 0;
188	}
189
190	static int upd78f0730_tiocmget(struct tty_struct *tty)
191	{
192	struct device *dev = tty->dev;
193	struct upd78f0730_port_private *private;
194	struct usb_serial_port *port = tty->driver_data;
195	int signals;
196	int res;
197
198	private = usb_get_serial_port_data(port);
199
200	mutex_lock(&private->lock);
201	signals = private->line_signals;
202	mutex_unlock(&private->lock);
203
204	res = ((signals & UPD78F0730_DTR) ? TIOCM_DTR : 0) \|
205	((signals & UPD78F0730_RTS) ? TIOCM_RTS : 0);
206
207	dev_dbg(dev, "%s - res = %x\n", __func__, res);
208
209	return res;
210	}
211
212	static int upd78f0730_tiocmset(struct tty_struct *tty,
213	unsigned int set, unsigned int clear)
214	{
215	struct device *dev = tty->dev;
216	struct usb_serial_port *port = tty->driver_data;
217	struct upd78f0730_port_private *private;
218	struct upd78f0730_set_dtr_rts request;
219	int res;
220
221	private = usb_get_serial_port_data(port);
222
223	mutex_lock(&private->lock);
224	if (set & TIOCM_DTR) {
225	private->line_signals \|= UPD78F0730_DTR;
226	dev_dbg(dev, "%s - set DTR\n", __func__);
227	}
228	if (set & TIOCM_RTS) {
229	private->line_signals \|= UPD78F0730_RTS;
230	dev_dbg(dev, "%s - set RTS\n", __func__);
231	}
232	if (clear & TIOCM_DTR) {
233	private->line_signals &= ~UPD78F0730_DTR;
234	dev_dbg(dev, "%s - clear DTR\n", __func__);
235	}
236	if (clear & TIOCM_RTS) {
237	private->line_signals &= ~UPD78F0730_RTS;
238	dev_dbg(dev, "%s - clear RTS\n", __func__);
239	}
240	request.opcode = UPD78F0730_CMD_SET_DTR_RTS;
241	request.params = private->line_signals;
242
243	res = upd78f0730_send_ctl(port, &request, sizeof(request));
244	mutex_unlock(&private->lock);
245
246	return res;
247	}
248
249	static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state)
250	{
251	struct device *dev = tty->dev;
252	struct upd78f0730_port_private *private;
253	struct usb_serial_port *port = tty->driver_data;
254	struct upd78f0730_set_dtr_rts request;
255
256	private = usb_get_serial_port_data(port);
257
258	mutex_lock(&private->lock);
259	if (break_state) {
260	private->line_signals \|= UPD78F0730_BREAK;
261	dev_dbg(dev, "%s - set BREAK\n", __func__);
262	} else {
263	private->line_signals &= ~UPD78F0730_BREAK;
264	dev_dbg(dev, "%s - clear BREAK\n", __func__);
265	}
266	request.opcode = UPD78F0730_CMD_SET_DTR_RTS;
267	request.params = private->line_signals;
268
269	upd78f0730_send_ctl(port, &request, sizeof(request));
270	mutex_unlock(&private->lock);
271	}
272
273	static void upd78f0730_dtr_rts(struct usb_serial_port *port, int on)
274	{
275	struct tty_struct *tty = port->port.tty;
276	unsigned int set = 0;
277	unsigned int clear = 0;
278
279	if (on)
280	set = TIOCM_DTR \| TIOCM_RTS;
281	else
282	clear = TIOCM_DTR \| TIOCM_RTS;
283
284	upd78f0730_tiocmset(tty, set, clear);
285	}
286
287	static speed_t upd78f0730_get_baud_rate(struct tty_struct *tty)
288	{
289	const speed_t baud_rate = tty_get_baud_rate(tty);
290	const speed_t supported[] = {
291	0, 2400, 4800, 9600, 19200, 38400, 57600, 115200
292	};
293	int i;
294
295	for (i = ARRAY_SIZE(supported) - 1; i >= 0; i--) {
296	if (baud_rate == supported[i])
297	return baud_rate;
298	}
299
300	/* If the baud rate is not supported, switch to the default one */
301	tty_encode_baud_rate(tty, 9600, 9600);
302
303	return tty_get_baud_rate(tty);
304	}
305
306	static void upd78f0730_set_termios(struct tty_struct *tty,
307	struct usb_serial_port *port,
308	struct ktermios *old_termios)
309	{
310	struct device *dev = &port->dev;
311	struct upd78f0730_line_control request;
312	speed_t baud_rate;
313
314	if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
315	return;
316
317	if (C_BAUD(tty) == B0)
318	upd78f0730_dtr_rts(port, 0);
319	else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
320	upd78f0730_dtr_rts(port, 1);
321
322	baud_rate = upd78f0730_get_baud_rate(tty);
323	request.opcode = UPD78F0730_CMD_LINE_CONTROL;
324	request.baud_rate = cpu_to_le32(baud_rate);
325	request.params = 0;
326	dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud_rate);
327
328	switch (C_CSIZE(tty)) {
329	case CS7:
330	request.params \|= UPD78F0730_DATA_SIZE_7_BITS;
331	dev_dbg(dev, "%s - 7 data bits\n", __func__);
332	break;
333	default:
334	tty->termios.c_cflag &= ~CSIZE;
335	tty->termios.c_cflag \|= CS8;
336	dev_warn(dev, "data size is not supported, using 8 bits\n");
337	/* fall through */
338	case CS8:
339	request.params \|= UPD78F0730_DATA_SIZE_8_BITS;
340	dev_dbg(dev, "%s - 8 data bits\n", __func__);
341	break;
342	}
343
344	if (C_PARENB(tty)) {
345	if (C_PARODD(tty)) {
346	request.params \|= UPD78F0730_PARITY_ODD;
347	dev_dbg(dev, "%s - odd parity\n", __func__);
348	} else {
349	request.params \|= UPD78F0730_PARITY_EVEN;
350	dev_dbg(dev, "%s - even parity\n", __func__);
351	}
352
353	if (C_CMSPAR(tty)) {
354	tty->termios.c_cflag &= ~CMSPAR;
355	dev_warn(dev, "MARK/SPACE parity is not supported\n");
356	}
357	} else {
358	request.params \|= UPD78F0730_PARITY_NONE;
359	dev_dbg(dev, "%s - no parity\n", __func__);
360	}
361
362	if (C_CSTOPB(tty)) {
363	request.params \|= UPD78F0730_STOP_BIT_2_BIT;
364	dev_dbg(dev, "%s - 2 stop bits\n", __func__);
365	} else {
366	request.params \|= UPD78F0730_STOP_BIT_1_BIT;
367	dev_dbg(dev, "%s - 1 stop bit\n", __func__);
368	}
369
370	if (C_CRTSCTS(tty)) {
371	tty->termios.c_cflag &= ~CRTSCTS;
372	dev_warn(dev, "RTSCTS flow control is not supported\n");
373	}
374	if (I_IXOFF(tty) \|\| I_IXON(tty)) {
375	tty->termios.c_iflag &= ~(IXOFF \| IXON);
376	dev_warn(dev, "XON/XOFF flow control is not supported\n");
377	}
378	request.params \|= UPD78F0730_FLOW_CONTROL_NONE;
379	dev_dbg(dev, "%s - no flow control\n", __func__);
380
381	upd78f0730_send_ctl(port, &request, sizeof(request));
382	}
383
384	static int upd78f0730_open(struct tty_struct tty, struct usb_serial_port port)
385	{
386	struct upd78f0730_open_close request = {
387	.opcode = UPD78F0730_CMD_OPEN_CLOSE,
388	.state = UPD78F0730_PORT_OPEN
389	};
390	int res;
391
392	res = upd78f0730_send_ctl(port, &request, sizeof(request));
393	if (res)
394	return res;
395
396	if (tty)
397	upd78f0730_set_termios(tty, port, NULL);
398
399	return usb_serial_generic_open(tty, port);
400	}
401
402	static void upd78f0730_close(struct usb_serial_port *port)
403	{
404	struct upd78f0730_open_close request = {
405	.opcode = UPD78F0730_CMD_OPEN_CLOSE,
406	.state = UPD78F0730_PORT_CLOSE
407	};
408
409	usb_serial_generic_close(port);
410	upd78f0730_send_ctl(port, &request, sizeof(request));
411	}
412
413	static struct usb_serial_driver upd78f0730_device = {
414	.driver = {
415	.owner = THIS_MODULE,
416	.name = "upd78f0730",
417	},
418	.id_table = id_table,
419	.num_ports = 1,
420	.port_probe = upd78f0730_port_probe,
421	.port_remove = upd78f0730_port_remove,
422	.open = upd78f0730_open,
423	.close = upd78f0730_close,
424	.set_termios = upd78f0730_set_termios,
425	.tiocmget = upd78f0730_tiocmget,
426	.tiocmset = upd78f0730_tiocmset,
427	.dtr_rts = upd78f0730_dtr_rts,
428	.break_ctl = upd78f0730_break_ctl,
429	};
430
431	static struct usb_serial_driver * const serial_drivers[] = {
432	&upd78f0730_device,
433	NULL
434	};
435
436	module_usb_serial_driver(serial_drivers, id_table);
437
438	MODULE_DESCRIPTION(DRIVER_DESC);
439	MODULE_AUTHOR(DRIVER_AUTHOR);
440	MODULE_LICENSE("GPL v2");