[qemu.git] / chardev / wctablet.c

/*
 * QEMU Wacom Penpartner serial tablet emulation
 *
 * some protocol details:
 *   http://linuxwacom.sourceforge.net/wiki/index.php/Serial_Protocol_IV
 *
 * Copyright (c) 2016 Anatoli Huseu1
 * Copyright (c) 2016,17 Gerd Hoffmann
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "qemu/module.h"
#include "chardev/char-serial.h"
#include "ui/console.h"
#include "ui/input.h"
#include "trace.h"


#define WC_OUTPUT_BUF_MAX_LEN 512
#define WC_COMMAND_MAX_LEN 60

#define WC_L7(n) ((n) & 127)
#define WC_M7(n) (((n) >> 7) & 127)
#define WC_H2(n) ((n) >> 14)

#define WC_L4(n) ((n) & 15)
#define WC_H4(n) (((n) >> 4) & 15)

/* Model string and config string */
#define WC_MODEL_STRING_LENGTH 18
uint8_t WC_MODEL_STRING[WC_MODEL_STRING_LENGTH + 1] = "~#CT-0045R,V1.3-5,";

#define WC_CONFIG_STRING_LENGTH 8
uint8_t WC_CONFIG_STRING[WC_CONFIG_STRING_LENGTH + 1] = "96,N,8,0";

#define WC_FULL_CONFIG_STRING_LENGTH 61
uint8_t WC_FULL_CONFIG_STRING[WC_FULL_CONFIG_STRING_LENGTH + 1] = {
    0x5c, 0x39, 0x36, 0x2c, 0x4e, 0x2c, 0x38, 0x2c,
    0x31, 0x28, 0x01, 0x24, 0x57, 0x41, 0x43, 0x30,
    0x30, 0x34, 0x35, 0x5c, 0x5c, 0x50, 0x45, 0x4e, 0x5c,
    0x57, 0x41, 0x43, 0x30, 0x30, 0x30, 0x30, 0x5c,
    0x54, 0x61, 0x62, 0x6c, 0x65, 0x74, 0x0d, 0x0a,
    0x43, 0x54, 0x2d, 0x30, 0x30, 0x34, 0x35, 0x52,
    0x2c, 0x56, 0x31, 0x2e, 0x33, 0x2d, 0x35, 0x0d,
    0x0a, 0x45, 0x37, 0x29
};

/* This structure is used to save private info for Wacom Tablet. */
typedef struct {
    Chardev parent;
    QemuInputHandlerState *hs;

    /* Query string from serial */
    uint8_t query[100];
    int query_index;

    /* Command to be sent to serial port */
    uint8_t outbuf[WC_OUTPUT_BUF_MAX_LEN];
    int outlen;

    int line_speed;
    bool send_events;
    int axis[INPUT_AXIS__MAX];
    bool btns[INPUT_BUTTON__MAX];

} TabletChardev;

#define TYPE_CHARDEV_WCTABLET "chardev-wctablet"
#define WCTABLET_CHARDEV(obj)                                      \
    OBJECT_CHECK(TabletChardev, (obj), TYPE_CHARDEV_WCTABLET)


static void wctablet_chr_accept_input(Chardev *chr);

static void wctablet_shift_input(TabletChardev *tablet, int count)
{
    tablet->query_index -= count;
    memmove(tablet->query, tablet->query + count, tablet->query_index);
    tablet->query[tablet->query_index] = 0;
}

static void wctablet_queue_output(TabletChardev *tablet, uint8_t *buf, int count)
{
    if (tablet->outlen + count > sizeof(tablet->outbuf)) {
        return;
    }

    memcpy(tablet->outbuf + tablet->outlen, buf, count);
    tablet->outlen += count;
    wctablet_chr_accept_input(CHARDEV(tablet));
}

static void wctablet_reset(TabletChardev *tablet)
{
    /* clear buffers */
    tablet->query_index = 0;
    tablet->outlen = 0;
    /* reset state */
    tablet->send_events = false;
}

static void wctablet_queue_event(TabletChardev *tablet)
{
    uint8_t codes[8] = { 0xe0, 0, 0, 0, 0, 0, 0 };

    if (tablet->line_speed != 9600) {
        return;
    }

    int newX = tablet->axis[INPUT_AXIS_X] * 0.1537;
    int nexY = tablet->axis[INPUT_AXIS_Y] * 0.1152;

    codes[0] = codes[0] | WC_H2(newX);
    codes[1] = codes[1] | WC_M7(newX);
    codes[2] = codes[2] | WC_L7(newX);

    codes[3] = codes[3] | WC_H2(nexY);
    codes[4] = codes[4] | WC_M7(nexY);
    codes[5] = codes[5] | WC_L7(nexY);

    if (tablet->btns[INPUT_BUTTON_LEFT]) {
        codes[0] = 0xa0;
    }

    wctablet_queue_output(tablet, codes, 7);
}

static void wctablet_input_event(DeviceState *dev, QemuConsole *src,
                                InputEvent *evt)
{
    TabletChardev *tablet = (TabletChardev *)dev;
    InputMoveEvent *move;
    InputBtnEvent *btn;

    switch (evt->type) {
    case INPUT_EVENT_KIND_ABS:
        move = evt->u.abs.data;
        tablet->axis[move->axis] = move->value;
        break;

    case INPUT_EVENT_KIND_BTN:
        btn = evt->u.btn.data;
        tablet->btns[btn->button] = btn->down;
        break;

    default:
        /* keep gcc happy */
        break;
    }
}

static void wctablet_input_sync(DeviceState *dev)
{
    TabletChardev *tablet = (TabletChardev *)dev;

    if (tablet->send_events) {
        wctablet_queue_event(tablet);
    }
}

static QemuInputHandler wctablet_handler = {
    .name  = "QEMU Wacom Pen Tablet",
    .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_ABS,
    .event = wctablet_input_event,
    .sync  = wctablet_input_sync,
};

static void wctablet_chr_accept_input(Chardev *chr)
{
    TabletChardev *tablet = WCTABLET_CHARDEV(chr);
    int len, canWrite;

    canWrite = qemu_chr_be_can_write(chr);
    len = canWrite;
    if (len > tablet->outlen) {
        len = tablet->outlen;
    }

    if (len) {
        qemu_chr_be_write(chr, tablet->outbuf, len);
        tablet->outlen -= len;
        if (tablet->outlen) {
            memmove(tablet->outbuf, tablet->outbuf + len, tablet->outlen);
        }
    }
}

static int wctablet_chr_write(struct Chardev *chr,
                              const uint8_t *buf, int len)
{
    TabletChardev *tablet = WCTABLET_CHARDEV(chr);
    unsigned int i, clen;
    char *pos;

    if (tablet->line_speed != 9600) {
        return len;
    }
    for (i = 0; i < len && tablet->query_index < sizeof(tablet->query) - 1; i++) {
        tablet->query[tablet->query_index++] = buf[i];
    }
    tablet->query[tablet->query_index] = 0;

    while (tablet->query_index > 0 && (tablet->query[0] == '@'  ||
                                       tablet->query[0] == '\r' ||
                                       tablet->query[0] == '\n')) {
        wctablet_shift_input(tablet, 1);
    }
    if (!tablet->query_index) {
        return len;
    }

    if (strncmp((char *)tablet->query, "~#", 2) == 0) {
        /* init / detect sequence */
        trace_wct_init();
        wctablet_shift_input(tablet, 2);
        wctablet_queue_output(tablet, WC_MODEL_STRING,
                              WC_MODEL_STRING_LENGTH);
        return len;
    }

    /* detect line */
    pos = strchr((char *)tablet->query, '\r');
    if (!pos) {
        pos = strchr((char *)tablet->query, '\n');
    }
    if (!pos) {
        return len;
    }
    clen = pos - (char *)tablet->query;

    /* process commands */
    if (strncmp((char *)tablet->query, "RE", 2) == 0 &&
        clen == 2) {
        trace_wct_cmd_re();
        wctablet_shift_input(tablet, 3);
        wctablet_queue_output(tablet, WC_CONFIG_STRING,
                              WC_CONFIG_STRING_LENGTH);

    } else if (strncmp((char *)tablet->query, "ST", 2) == 0 &&
               clen == 2) {
        trace_wct_cmd_st();
        wctablet_shift_input(tablet, 3);
        tablet->send_events = true;
        wctablet_queue_event(tablet);

    } else if (strncmp((char *)tablet->query, "SP", 2) == 0 &&
               clen == 2) {
        trace_wct_cmd_sp();
        wctablet_shift_input(tablet, 3);
        tablet->send_events = false;

    } else if (strncmp((char *)tablet->query, "TS", 2) == 0 &&
               clen == 3) {
        unsigned int input = tablet->query[2];
        uint8_t codes[7] = {
            0xa3,
            ((input & 0x80) == 0) ? 0x7e : 0x7f,
            (((WC_H4(input) & 0x7) ^ 0x5) << 4) | (WC_L4(input) ^ 0x7),
            0x03,
            0x7f,
            0x7f,
            0x00,
        };
        trace_wct_cmd_ts(input);
        wctablet_shift_input(tablet, 4);
        wctablet_queue_output(tablet, codes, 7);

    } else {
        tablet->query[clen] = 0; /* terminate line for printing */
        trace_wct_cmd_other((char *)tablet->query);
        wctablet_shift_input(tablet, clen + 1);

    }

    return len;
}

static int wctablet_chr_ioctl(Chardev *chr, int cmd, void *arg)
{
    TabletChardev *tablet = WCTABLET_CHARDEV(chr);
    QEMUSerialSetParams *ssp;

    switch (cmd) {
    case CHR_IOCTL_SERIAL_SET_PARAMS:
        ssp = arg;
        if (tablet->line_speed != ssp->speed) {
            trace_wct_speed(ssp->speed);
            wctablet_reset(tablet);
            tablet->line_speed = ssp->speed;
        }
        break;
    default:
        return -ENOTSUP;
    }
    return 0;
}

static void wctablet_chr_finalize(Object *obj)
{
    TabletChardev *tablet = WCTABLET_CHARDEV(obj);

    qemu_input_handler_unregister(tablet->hs);
    g_free(tablet);
}

static void wctablet_chr_open(Chardev *chr,
                              ChardevBackend *backend,
                              bool *be_opened,
                              Error **errp)
{
    TabletChardev *tablet = WCTABLET_CHARDEV(chr);

    *be_opened = true;

    /* init state machine */
    memcpy(tablet->outbuf, WC_FULL_CONFIG_STRING, WC_FULL_CONFIG_STRING_LENGTH);
    tablet->outlen = WC_FULL_CONFIG_STRING_LENGTH;
    tablet->query_index = 0;

    tablet->hs = qemu_input_handler_register((DeviceState *)tablet,
                                             &wctablet_handler);
}

static void wctablet_chr_class_init(ObjectClass *oc, void *data)
{
    ChardevClass *cc = CHARDEV_CLASS(oc);

    cc->open = wctablet_chr_open;
    cc->chr_write = wctablet_chr_write;
    cc->chr_ioctl = wctablet_chr_ioctl;
    cc->chr_accept_input = wctablet_chr_accept_input;
}

static const TypeInfo wctablet_type_info = {
    .name = TYPE_CHARDEV_WCTABLET,
    .parent = TYPE_CHARDEV,
    .instance_size = sizeof(TabletChardev),
    .instance_finalize = wctablet_chr_finalize,
    .class_init = wctablet_chr_class_init,
};

static void register_types(void)
{
     type_register_static(&wctablet_type_info);
}

type_init(register_types);
Commit	Line	Data
378af961 AH	1	/*
	2	* QEMU Wacom Penpartner serial tablet emulation
	3	*
	4	* some protocol details:
	5	* http://linuxwacom.sourceforge.net/wiki/index.php/Serial_Protocol_IV
	6	*
	7	* Copyright (c) 2016 Anatoli Huseu1
	8	* Copyright (c) 2016,17 Gerd Hoffmann
	9	*
	10	* Permission is hereby granted, free of charge, to any person obtaining a copy
	11	* of this software and associated documentation files (the "Software"), to
	12	* deal in the Software without restriction, including without limitation
	13	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	14	* and/or sell copies of the Software, and to permit persons to whom the
	15	* Software is furnished to do so, subject to the following conditions:
	16	*
	17	* The above copyright notice and this permission notice shall be included in
	18	* all copies or substantial portions of the Software.
	19	*
	20	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	21	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	23	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	24	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM
	25	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	26	* THE SOFTWARE.
	27	*/
378af961 AH	28
378af961 AH	29	#include "qemu/osdep.h"
0b8fa32f	30	#include "qemu/module.h"
7566c6ef	31	#include "chardev/char-serial.h"
378af961 AH	32	#include "ui/console.h"
	33	#include "ui/input.h"
	34	#include "trace.h"
	35
	36
	37	#define WC_OUTPUT_BUF_MAX_LEN 512
	38	#define WC_COMMAND_MAX_LEN 60
	39
	40	#define WC_L7(n) ((n) & 127)
	41	#define WC_M7(n) (((n) >> 7) & 127)
	42	#define WC_H2(n) ((n) >> 14)
	43
	44	#define WC_L4(n) ((n) & 15)
	45	#define WC_H4(n) (((n) >> 4) & 15)
	46
	47	/* Model string and config string */
	48	#define WC_MODEL_STRING_LENGTH 18
	49	uint8_t WC_MODEL_STRING[WC_MODEL_STRING_LENGTH + 1] = "~#CT-0045R,V1.3-5,";
	50
	51	#define WC_CONFIG_STRING_LENGTH 8
	52	uint8_t WC_CONFIG_STRING[WC_CONFIG_STRING_LENGTH + 1] = "96,N,8,0";
	53
	54	#define WC_FULL_CONFIG_STRING_LENGTH 61
	55	uint8_t WC_FULL_CONFIG_STRING[WC_FULL_CONFIG_STRING_LENGTH + 1] = {
	56	0x5c, 0x39, 0x36, 0x2c, 0x4e, 0x2c, 0x38, 0x2c,
	57	0x31, 0x28, 0x01, 0x24, 0x57, 0x41, 0x43, 0x30,
	58	0x30, 0x34, 0x35, 0x5c, 0x5c, 0x50, 0x45, 0x4e, 0x5c,
	59	0x57, 0x41, 0x43, 0x30, 0x30, 0x30, 0x30, 0x5c,
	60	0x54, 0x61, 0x62, 0x6c, 0x65, 0x74, 0x0d, 0x0a,
	61	0x43, 0x54, 0x2d, 0x30, 0x30, 0x34, 0x35, 0x52,
	62	0x2c, 0x56, 0x31, 0x2e, 0x33, 0x2d, 0x35, 0x0d,
	63	0x0a, 0x45, 0x37, 0x29
	64	};
	65
	66	/* This structure is used to save private info for Wacom Tablet. */
	67	typedef struct {
	68	Chardev parent;
	69	QemuInputHandlerState *hs;
	70
	71	/* Query string from serial */
	72	uint8_t query[100];
	73	int query_index;
	74
	75	/* Command to be sent to serial port */
	76	uint8_t outbuf[WC_OUTPUT_BUF_MAX_LEN];
	77	int outlen;
	78
	79	int line_speed;
	80	bool send_events;
	81	int axis[INPUT_AXIS__MAX];
	82	bool btns[INPUT_BUTTON__MAX];
	83
	84	} TabletChardev;
	85
	86	#define TYPE_CHARDEV_WCTABLET "chardev-wctablet"
	87	#define WCTABLET_CHARDEV(obj) \
	88	OBJECT_CHECK(TabletChardev, (obj), TYPE_CHARDEV_WCTABLET)
	89
	90
	91	static void wctablet_chr_accept_input(Chardev *chr);
	92
	93	static void wctablet_shift_input(TabletChardev *tablet, int count)
	94	{
	95	tablet->query_index -= count;
96	memmove(tablet->query, tablet->query + count, tablet->query_index);
97	tablet->query[tablet->query_index] = 0;
98	}
99
100	static void wctablet_queue_output(TabletChardev tablet, uint8_t buf, int count)
101	{
102	if (tablet->outlen + count > sizeof(tablet->outbuf)) {
103	return;
104	}
105
106	memcpy(tablet->outbuf + tablet->outlen, buf, count);
107	tablet->outlen += count;
108	wctablet_chr_accept_input(CHARDEV(tablet));
109	}
110
111	static void wctablet_reset(TabletChardev *tablet)
112	{
113	/* clear buffers */
114	tablet->query_index = 0;
115	tablet->outlen = 0;
116	/* reset state */
117	tablet->send_events = false;
118	}
119
120	static void wctablet_queue_event(TabletChardev *tablet)
121	{
122	uint8_t codes[8] = { 0xe0, 0, 0, 0, 0, 0, 0 };
123
124	if (tablet->line_speed != 9600) {
125	return;
126	}
127
128	int newX = tablet->axis[INPUT_AXIS_X] * 0.1537;
129	int nexY = tablet->axis[INPUT_AXIS_Y] * 0.1152;
130
131	codes[0] = codes[0] \| WC_H2(newX);
132	codes[1] = codes[1] \| WC_M7(newX);
133	codes[2] = codes[2] \| WC_L7(newX);
134
135	codes[3] = codes[3] \| WC_H2(nexY);
136	codes[4] = codes[4] \| WC_M7(nexY);
137	codes[5] = codes[5] \| WC_L7(nexY);
138
139	if (tablet->btns[INPUT_BUTTON_LEFT]) {
140	codes[0] = 0xa0;
141	}
142
143	wctablet_queue_output(tablet, codes, 7);
144	}
145
146	static void wctablet_input_event(DeviceState dev, QemuConsole src,
147	InputEvent *evt)
148	{
149	TabletChardev tablet = (TabletChardev )dev;
150	InputMoveEvent *move;
151	InputBtnEvent *btn;
152
153	switch (evt->type) {
154	case INPUT_EVENT_KIND_ABS:
155	move = evt->u.abs.data;
156	tablet->axis[move->axis] = move->value;
157	break;
158
159	case INPUT_EVENT_KIND_BTN:
160	btn = evt->u.btn.data;
161	tablet->btns[btn->button] = btn->down;
162	break;
163
164	default:
165	/* keep gcc happy */
166	break;
167	}
168	}
169
170	static void wctablet_input_sync(DeviceState *dev)
171	{
172	TabletChardev tablet = (TabletChardev )dev;
173
174	if (tablet->send_events) {
175	wctablet_queue_event(tablet);
176	}
177	}
178
179	static QemuInputHandler wctablet_handler = {
129263c6	180	.name = "QEMU Wacom Pen Tablet",
378af961 AH	181	.mask = INPUT_EVENT_MASK_BTN \| INPUT_EVENT_MASK_ABS,
	182	.event = wctablet_input_event,
	183	.sync = wctablet_input_sync,
	184	};
	185
	186	static void wctablet_chr_accept_input(Chardev *chr)
	187	{
	188	TabletChardev *tablet = WCTABLET_CHARDEV(chr);
	189	int len, canWrite;
	190
	191	canWrite = qemu_chr_be_can_write(chr);
	192	len = canWrite;
	193	if (len > tablet->outlen) {
	194	len = tablet->outlen;
	195	}
	196
	197	if (len) {
	198	qemu_chr_be_write(chr, tablet->outbuf, len);
	199	tablet->outlen -= len;
	200	if (tablet->outlen) {
	201	memmove(tablet->outbuf, tablet->outbuf + len, tablet->outlen);
	202	}
	203	}
	204	}
	205
	206	static int wctablet_chr_write(struct Chardev *chr,
	207	const uint8_t *buf, int len)
	208	{
	209	TabletChardev *tablet = WCTABLET_CHARDEV(chr);
	210	unsigned int i, clen;
	211	char *pos;
	212
	213	if (tablet->line_speed != 9600) {
	214	return len;
	215	}
	216	for (i = 0; i < len && tablet->query_index < sizeof(tablet->query) - 1; i++) {
	217	tablet->query[tablet->query_index++] = buf[i];
	218	}
	219	tablet->query[tablet->query_index] = 0;
	220
	221	while (tablet->query_index > 0 && (tablet->query[0] == '@' \|\|
	222	tablet->query[0] == '\r' \|\|
	223	tablet->query[0] == '\n')) {
	224	wctablet_shift_input(tablet, 1);
	225	}
	226	if (!tablet->query_index) {
	227	return len;
	228	}
	229
	230	if (strncmp((char *)tablet->query, "~#", 2) == 0) {
	231	/* init / detect sequence */
	232	trace_wct_init();
	233	wctablet_shift_input(tablet, 2);
	234	wctablet_queue_output(tablet, WC_MODEL_STRING,
	235	WC_MODEL_STRING_LENGTH);
	236	return len;
	237	}
	238
	239	/* detect line */
	240	pos = strchr((char *)tablet->query, '\r');
	241	if (!pos) {
	242	pos = strchr((char *)tablet->query, '\n');
	243	}
	244	if (!pos) {
245	return len;
246	}
247	clen = pos - (char *)tablet->query;
248
249	/* process commands */
250	if (strncmp((char *)tablet->query, "RE", 2) == 0 &&
251	clen == 2) {
252	trace_wct_cmd_re();
253	wctablet_shift_input(tablet, 3);
254	wctablet_queue_output(tablet, WC_CONFIG_STRING,
255	WC_CONFIG_STRING_LENGTH);
256
257	} else if (strncmp((char *)tablet->query, "ST", 2) == 0 &&
258	clen == 2) {
259	trace_wct_cmd_st();
260	wctablet_shift_input(tablet, 3);
261	tablet->send_events = true;
262	wctablet_queue_event(tablet);
263
264	} else if (strncmp((char *)tablet->query, "SP", 2) == 0 &&
265	clen == 2) {
266	trace_wct_cmd_sp();
267	wctablet_shift_input(tablet, 3);
268	tablet->send_events = false;
269
270	} else if (strncmp((char *)tablet->query, "TS", 2) == 0 &&
271	clen == 3) {
272	unsigned int input = tablet->query[2];
273	uint8_t codes[7] = {
274	0xa3,
275	((input & 0x80) == 0) ? 0x7e : 0x7f,
276	(((WC_H4(input) & 0x7) ^ 0x5) << 4) \| (WC_L4(input) ^ 0x7),
277	0x03,
278	0x7f,
279	0x7f,
280	0x00,
281	};
282	trace_wct_cmd_ts(input);
283	wctablet_shift_input(tablet, 4);
284	wctablet_queue_output(tablet, codes, 7);
285
286	} else {
287	tablet->query[clen] = 0; /* terminate line for printing */
288	trace_wct_cmd_other((char *)tablet->query);
289	wctablet_shift_input(tablet, clen + 1);
290
291	}
292
293	return len;
294	}
295
296	static int wctablet_chr_ioctl(Chardev chr, int cmd, void arg)
297	{
298	TabletChardev *tablet = WCTABLET_CHARDEV(chr);
299	QEMUSerialSetParams *ssp;
300
301	switch (cmd) {
302	case CHR_IOCTL_SERIAL_SET_PARAMS:
303	ssp = arg;
304	if (tablet->line_speed != ssp->speed) {
305	trace_wct_speed(ssp->speed);
306	wctablet_reset(tablet);
307	tablet->line_speed = ssp->speed;
308	}
309	break;
310	default:
311	return -ENOTSUP;
312	}
313	return 0;
314	}
315
316	static void wctablet_chr_finalize(Object *obj)
317	{
318	TabletChardev *tablet = WCTABLET_CHARDEV(obj);
319
320	qemu_input_handler_unregister(tablet->hs);
321	g_free(tablet);
322	}
323
324	static void wctablet_chr_open(Chardev *chr,
325	ChardevBackend *backend,
326	bool *be_opened,
327	Error **errp)
328	{
329	TabletChardev *tablet = WCTABLET_CHARDEV(chr);
330
331	*be_opened = true;
332
333	/* init state machine */
334	memcpy(tablet->outbuf, WC_FULL_CONFIG_STRING, WC_FULL_CONFIG_STRING_LENGTH);
335	tablet->outlen = WC_FULL_CONFIG_STRING_LENGTH;
336	tablet->query_index = 0;
337
338	tablet->hs = qemu_input_handler_register((DeviceState *)tablet,
339	&wctablet_handler);
340	}
341
342	static void wctablet_chr_class_init(ObjectClass oc, void data)
343	{
344	ChardevClass *cc = CHARDEV_CLASS(oc);
345
346	cc->open = wctablet_chr_open;
347	cc->chr_write = wctablet_chr_write;
348	cc->chr_ioctl = wctablet_chr_ioctl;
349	cc->chr_accept_input = wctablet_chr_accept_input;
350	}
351
352	static const TypeInfo wctablet_type_info = {
353	.name = TYPE_CHARDEV_WCTABLET,
354	.parent = TYPE_CHARDEV,
355	.instance_size = sizeof(TabletChardev),
356	.instance_finalize = wctablet_chr_finalize,
357	.class_init = wctablet_chr_class_init,
358	};
359
360	static void register_types(void)
361	{
362	type_register_static(&wctablet_type_info);
363	}
364
365	type_init(register_types);