[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / Documentation / usb / gadget_hid.txt


		     Linux USB HID gadget driver

Introduction

	The HID Gadget driver provides emulation of USB Human Interface
	Devices (HID). The basic HID handling is done in the kernel,
	and HID reports can be sent/received through I/O on the
	/dev/hidgX character devices.

	For more details about HID, see the developer page on
	http://www.usb.org/developers/hidpage/

Configuration

	g_hid is a platform driver, so to use it you need to add
	struct platform_device(s) to your platform code defining the
	HID function descriptors you want to use - E.G. something
	like:

#include <linux/platform_device.h>
#include <linux/usb/g_hid.h>

/* hid descriptor for a keyboard */
static struct hidg_func_descriptor my_hid_data = {
	.subclass		= 0, /* No subclass */
	.protocol		= 1, /* Keyboard */
	.report_length		= 8,
	.report_desc_length	= 63,
	.report_desc		= {
		0x05, 0x01,	/* USAGE_PAGE (Generic Desktop)	          */
		0x09, 0x06,	/* USAGE (Keyboard)                       */
		0xa1, 0x01,	/* COLLECTION (Application)               */
		0x05, 0x07,	/*   USAGE_PAGE (Keyboard)                */
		0x19, 0xe0,	/*   USAGE_MINIMUM (Keyboard LeftControl) */
		0x29, 0xe7,	/*   USAGE_MAXIMUM (Keyboard Right GUI)   */
		0x15, 0x00,	/*   LOGICAL_MINIMUM (0)                  */
		0x25, 0x01,	/*   LOGICAL_MAXIMUM (1)                  */
		0x75, 0x01,	/*   REPORT_SIZE (1)                      */
		0x95, 0x08,	/*   REPORT_COUNT (8)                     */
		0x81, 0x02,	/*   INPUT (Data,Var,Abs)                 */
		0x95, 0x01,	/*   REPORT_COUNT (1)                     */
		0x75, 0x08,	/*   REPORT_SIZE (8)                      */
		0x81, 0x03,	/*   INPUT (Cnst,Var,Abs)                 */
		0x95, 0x05,	/*   REPORT_COUNT (5)                     */
		0x75, 0x01,	/*   REPORT_SIZE (1)                      */
		0x05, 0x08,	/*   USAGE_PAGE (LEDs)                    */
		0x19, 0x01,	/*   USAGE_MINIMUM (Num Lock)             */
		0x29, 0x05,	/*   USAGE_MAXIMUM (Kana)                 */
		0x91, 0x02,	/*   OUTPUT (Data,Var,Abs)                */
		0x95, 0x01,	/*   REPORT_COUNT (1)                     */
		0x75, 0x03,	/*   REPORT_SIZE (3)                      */
		0x91, 0x03,	/*   OUTPUT (Cnst,Var,Abs)                */
		0x95, 0x06,	/*   REPORT_COUNT (6)                     */
		0x75, 0x08,	/*   REPORT_SIZE (8)                      */
		0x15, 0x00,	/*   LOGICAL_MINIMUM (0)                  */
		0x25, 0x65,	/*   LOGICAL_MAXIMUM (101)                */
		0x05, 0x07,	/*   USAGE_PAGE (Keyboard)                */
		0x19, 0x00,	/*   USAGE_MINIMUM (Reserved)             */
		0x29, 0x65,	/*   USAGE_MAXIMUM (Keyboard Application) */
		0x81, 0x00,	/*   INPUT (Data,Ary,Abs)                 */
		0xc0		/* END_COLLECTION                         */
	}
};

static struct platform_device my_hid = {
	.name			= "hidg",
	.id			= 0,
	.num_resources		= 0,
	.resource		= 0,
	.dev.platform_data	= &my_hid_data,
};

	You can add as many HID functions as you want, only limited by
	the amount of interrupt endpoints your gadget driver supports.

Configuration with configfs

	Instead of adding fake platform devices and drivers in order to pass
	some data to the kernel, if HID is a part of a gadget composed with
	configfs the hidg_func_descriptor.report_desc is passed to the kernel
	by writing the appropriate stream of bytes to a configfs attribute.

Send and receive HID reports

	HID reports can be sent/received using read/write on the
	/dev/hidgX character devices. See below for an example program
	to do this.

	hid_gadget_test is a small interactive program to test the HID
	gadget driver. To use, point it at a hidg device and set the
	device type (keyboard / mouse / joystick) - E.G.:

		# hid_gadget_test /dev/hidg0 keyboard

	You are now in the prompt of hid_gadget_test. You can type any
	combination of options and values. Available options and
	values are listed at program start. In keyboard mode you can
	send up to six values.

	For example type: g i s t r --left-shift

	Hit return and the corresponding report will be sent by the
	HID gadget.

	Another interesting example is the caps lock test. Type
	--caps-lock and hit return. A report is then sent by the
	gadget and you should receive the host answer, corresponding
	to the caps lock LED status.

		--caps-lock
		recv report:2

	With this command:

		# hid_gadget_test /dev/hidg1 mouse

	You can test the mouse emulation. Values are two signed numbers.


Sample code

/* hid_gadget_test */

#include <pthread.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define BUF_LEN 512

struct options {
	const char    *opt;
	unsigned char val;
};

static struct options kmod[] = {
	{.opt = "--left-ctrl",		.val = 0x01},
	{.opt = "--right-ctrl",		.val = 0x10},
	{.opt = "--left-shift",		.val = 0x02},
	{.opt = "--right-shift",	.val = 0x20},
	{.opt = "--left-alt",		.val = 0x04},
	{.opt = "--right-alt",		.val = 0x40},
	{.opt = "--left-meta",		.val = 0x08},
	{.opt = "--right-meta",		.val = 0x80},
	{.opt = NULL}
};

static struct options kval[] = {
	{.opt = "--return",	.val = 0x28},
	{.opt = "--esc",	.val = 0x29},
	{.opt = "--bckspc",	.val = 0x2a},
	{.opt = "--tab",	.val = 0x2b},
	{.opt = "--spacebar",	.val = 0x2c},
	{.opt = "--caps-lock",	.val = 0x39},
	{.opt = "--f1",		.val = 0x3a},
	{.opt = "--f2",		.val = 0x3b},
	{.opt = "--f3",		.val = 0x3c},
	{.opt = "--f4",		.val = 0x3d},
	{.opt = "--f5",		.val = 0x3e},
	{.opt = "--f6",		.val = 0x3f},
	{.opt = "--f7",		.val = 0x40},
	{.opt = "--f8",		.val = 0x41},
	{.opt = "--f9",		.val = 0x42},
	{.opt = "--f10",	.val = 0x43},
	{.opt = "--f11",	.val = 0x44},
	{.opt = "--f12",	.val = 0x45},
	{.opt = "--insert",	.val = 0x49},
	{.opt = "--home",	.val = 0x4a},
	{.opt = "--pageup",	.val = 0x4b},
	{.opt = "--del",	.val = 0x4c},
	{.opt = "--end",	.val = 0x4d},
	{.opt = "--pagedown",	.val = 0x4e},
	{.opt = "--right",	.val = 0x4f},
	{.opt = "--left",	.val = 0x50},
	{.opt = "--down",	.val = 0x51},
	{.opt = "--kp-enter",	.val = 0x58},
	{.opt = "--up",		.val = 0x52},
	{.opt = "--num-lock",	.val = 0x53},
	{.opt = NULL}
};

int keyboard_fill_report(char report[8], char buf[BUF_LEN], int *hold)
{
	char *tok = strtok(buf, " ");
	int key = 0;
	int i = 0;

	for (; tok != NULL; tok = strtok(NULL, " ")) {

		if (strcmp(tok, "--quit") == 0)
			return -1;

		if (strcmp(tok, "--hold") == 0) {
			*hold = 1;
			continue;
		}

		if (key < 6) {
			for (i = 0; kval[i].opt != NULL; i++)
				if (strcmp(tok, kval[i].opt) == 0) {
					report[2 + key++] = kval[i].val;
					break;
				}
			if (kval[i].opt != NULL)
				continue;
		}

		if (key < 6)
			if (islower(tok[0])) {
				report[2 + key++] = (tok[0] - ('a' - 0x04));
				continue;
			}

		for (i = 0; kmod[i].opt != NULL; i++)
			if (strcmp(tok, kmod[i].opt) == 0) {
				report[0] = report[0] | kmod[i].val;
				break;
			}
		if (kmod[i].opt != NULL)
			continue;

		if (key < 6)
			fprintf(stderr, "unknown option: %s\n", tok);
	}
	return 8;
}

static struct options mmod[] = {
	{.opt = "--b1", .val = 0x01},
	{.opt = "--b2", .val = 0x02},
	{.opt = "--b3", .val = 0x04},
	{.opt = NULL}
};

int mouse_fill_report(char report[8], char buf[BUF_LEN], int *hold)
{
	char *tok = strtok(buf, " ");
	int mvt = 0;
	int i = 0;
	for (; tok != NULL; tok = strtok(NULL, " ")) {

		if (strcmp(tok, "--quit") == 0)
			return -1;

		if (strcmp(tok, "--hold") == 0) {
			*hold = 1;
			continue;
		}

		for (i = 0; mmod[i].opt != NULL; i++)
			if (strcmp(tok, mmod[i].opt) == 0) {
				report[0] = report[0] | mmod[i].val;
				break;
			}
		if (mmod[i].opt != NULL)
			continue;

		if (!(tok[0] == '-' && tok[1] == '-') && mvt < 2) {
			errno = 0;
			report[1 + mvt++] = (char)strtol(tok, NULL, 0);
			if (errno != 0) {
				fprintf(stderr, "Bad value:'%s'\n", tok);
				report[1 + mvt--] = 0;
			}
			continue;
		}

		fprintf(stderr, "unknown option: %s\n", tok);
	}
	return 3;
}

static struct options jmod[] = {
	{.opt = "--b1",		.val = 0x10},
	{.opt = "--b2",		.val = 0x20},
	{.opt = "--b3",		.val = 0x40},
	{.opt = "--b4",		.val = 0x80},
	{.opt = "--hat1",	.val = 0x00},
	{.opt = "--hat2",	.val = 0x01},
	{.opt = "--hat3",	.val = 0x02},
	{.opt = "--hat4",	.val = 0x03},
	{.opt = "--hatneutral",	.val = 0x04},
	{.opt = NULL}
};

int joystick_fill_report(char report[8], char buf[BUF_LEN], int *hold)
{
	char *tok = strtok(buf, " ");
	int mvt = 0;
	int i = 0;

	*hold = 1;

	/* set default hat position: neutral */
	report[3] = 0x04;

	for (; tok != NULL; tok = strtok(NULL, " ")) {

		if (strcmp(tok, "--quit") == 0)
			return -1;

		for (i = 0; jmod[i].opt != NULL; i++)
			if (strcmp(tok, jmod[i].opt) == 0) {
				report[3] = (report[3] & 0xF0) | jmod[i].val;
				break;
			}
		if (jmod[i].opt != NULL)
			continue;

		if (!(tok[0] == '-' && tok[1] == '-') && mvt < 3) {
			errno = 0;
			report[mvt++] = (char)strtol(tok, NULL, 0);
			if (errno != 0) {
				fprintf(stderr, "Bad value:'%s'\n", tok);
				report[mvt--] = 0;
			}
			continue;
		}

		fprintf(stderr, "unknown option: %s\n", tok);
	}
	return 4;
}

void print_options(char c)
{
	int i = 0;

	if (c == 'k') {
		printf("	keyboard options:\n"
		       "		--hold\n");
		for (i = 0; kmod[i].opt != NULL; i++)
			printf("\t\t%s\n", kmod[i].opt);
		printf("\n	keyboard values:\n"
		       "		[a-z] or\n");
		for (i = 0; kval[i].opt != NULL; i++)
			printf("\t\t%-8s%s", kval[i].opt, i % 2 ? "\n" : "");
		printf("\n");
	} else if (c == 'm') {
		printf("	mouse options:\n"
		       "		--hold\n");
		for (i = 0; mmod[i].opt != NULL; i++)
			printf("\t\t%s\n", mmod[i].opt);
		printf("\n	mouse values:\n"
		       "		Two signed numbers\n"
		       "--quit to close\n");
	} else {
		printf("	joystick options:\n");
		for (i = 0; jmod[i].opt != NULL; i++)
			printf("\t\t%s\n", jmod[i].opt);
		printf("\n	joystick values:\n"
		       "		three signed numbers\n"
		       "--quit to close\n");
	}
}

int main(int argc, const char *argv[])
{
	const char *filename = NULL;
	int fd = 0;
	char buf[BUF_LEN];
	int cmd_len;
	char report[8];
	int to_send = 8;
	int hold = 0;
	fd_set rfds;
	int retval, i;

	if (argc < 3) {
		fprintf(stderr, "Usage: %s devname mouse|keyboard|joystick\n",
			argv[0]);
		return 1;
	}

	if (argv[2][0] != 'k' && argv[2][0] != 'm' && argv[2][0] != 'j')
	  return 2;

	filename = argv[1];

	if ((fd = open(filename, O_RDWR, 0666)) == -1) {
		perror(filename);
		return 3;
	}

	print_options(argv[2][0]);

	while (42) {

		FD_ZERO(&rfds);
		FD_SET(STDIN_FILENO, &rfds);
		FD_SET(fd, &rfds);

		retval = select(fd + 1, &rfds, NULL, NULL, NULL);
		if (retval == -1 && errno == EINTR)
			continue;
		if (retval < 0) {
			perror("select()");
			return 4;
		}

		if (FD_ISSET(fd, &rfds)) {
			cmd_len = read(fd, buf, BUF_LEN - 1);
			printf("recv report:");
			for (i = 0; i < cmd_len; i++)
				printf(" %02x", buf[i]);
			printf("\n");
		}

		if (FD_ISSET(STDIN_FILENO, &rfds)) {
			memset(report, 0x0, sizeof(report));
			cmd_len = read(STDIN_FILENO, buf, BUF_LEN - 1);

			if (cmd_len == 0)
				break;

			buf[cmd_len - 1] = '\0';
			hold = 0;

			memset(report, 0x0, sizeof(report));
			if (argv[2][0] == 'k')
				to_send = keyboard_fill_report(report, buf, &hold);
			else if (argv[2][0] == 'm')
				to_send = mouse_fill_report(report, buf, &hold);
			else
				to_send = joystick_fill_report(report, buf, &hold);

			if (to_send == -1)
				break;

			if (write(fd, report, to_send) != to_send) {
				perror(filename);
				return 5;
			}
			if (!hold) {
				memset(report, 0x0, sizeof(report));
				if (write(fd, report, to_send) != to_send) {
					perror(filename);
					return 6;
				}
			}
		}
	}

	close(fd);
	return 0;
}
Commit	Line	Data
71adf118 FC	1
	2	Linux USB HID gadget driver
	3
	4	Introduction
	5
	6	The HID Gadget driver provides emulation of USB Human Interface
	7	Devices (HID). The basic HID handling is done in the kernel,
	8	and HID reports can be sent/received through I/O on the
	9	/dev/hidgX character devices.
	10
	11	For more details about HID, see the developer page on
	12	http://www.usb.org/developers/hidpage/
	13
	14	Configuration
	15
	16	g_hid is a platform driver, so to use it you need to add
	17	struct platform_device(s) to your platform code defining the
	18	HID function descriptors you want to use - E.G. something
	19	like:
	20
	21	#include <linux/platform_device.h>
	22	#include <linux/usb/g_hid.h>
	23
	24	/* hid descriptor for a keyboard */
	25	static struct hidg_func_descriptor my_hid_data = {
	26	.subclass = 0, /* No subclass */
	27	.protocol = 1, /* Keyboard */
	28	.report_length = 8,
	29	.report_desc_length = 63,
	30	.report_desc = {
	31	0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
	32	0x09, 0x06, /* USAGE (Keyboard) */
	33	0xa1, 0x01, /* COLLECTION (Application) */
	34	0x05, 0x07, /* USAGE_PAGE (Keyboard) */
	35	0x19, 0xe0, /* USAGE_MINIMUM (Keyboard LeftControl) */
	36	0x29, 0xe7, /* USAGE_MAXIMUM (Keyboard Right GUI) */
	37	0x15, 0x00, /* LOGICAL_MINIMUM (0) */
	38	0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
	39	0x75, 0x01, /* REPORT_SIZE (1) */
	40	0x95, 0x08, /* REPORT_COUNT (8) */
	41	0x81, 0x02, /* INPUT (Data,Var,Abs) */
	42	0x95, 0x01, /* REPORT_COUNT (1) */
	43	0x75, 0x08, /* REPORT_SIZE (8) */
	44	0x81, 0x03, /* INPUT (Cnst,Var,Abs) */
	45	0x95, 0x05, /* REPORT_COUNT (5) */
	46	0x75, 0x01, /* REPORT_SIZE (1) */
	47	0x05, 0x08, /* USAGE_PAGE (LEDs) */
	48	0x19, 0x01, /* USAGE_MINIMUM (Num Lock) */
	49	0x29, 0x05, /* USAGE_MAXIMUM (Kana) */
	50	0x91, 0x02, /* OUTPUT (Data,Var,Abs) */
	51	0x95, 0x01, /* REPORT_COUNT (1) */
	52	0x75, 0x03, /* REPORT_SIZE (3) */
	53	0x91, 0x03, /* OUTPUT (Cnst,Var,Abs) */
	54	0x95, 0x06, /* REPORT_COUNT (6) */
	55	0x75, 0x08, /* REPORT_SIZE (8) */
	56	0x15, 0x00, /* LOGICAL_MINIMUM (0) */
	57	0x25, 0x65, /* LOGICAL_MAXIMUM (101) */
	58	0x05, 0x07, /* USAGE_PAGE (Keyboard) */
	59	0x19, 0x00, /* USAGE_MINIMUM (Reserved) */
	60	0x29, 0x65, /* USAGE_MAXIMUM (Keyboard Application) */
	61	0x81, 0x00, /* INPUT (Data,Ary,Abs) */
	62	0xc0 /* END_COLLECTION */
	63	}
	64	};
65
66	static struct platform_device my_hid = {
67	.name = "hidg",
68	.id = 0,
69	.num_resources = 0,
70	.resource = 0,
71	.dev.platform_data = &my_hid_data,
72	};
73
74	You can add as many HID functions as you want, only limited by
75	the amount of interrupt endpoints your gadget driver supports.
76
21a9476a AP	77	Configuration with configfs
	78
	79	Instead of adding fake platform devices and drivers in order to pass
	80	some data to the kernel, if HID is a part of a gadget composed with
	81	configfs the hidg_func_descriptor.report_desc is passed to the kernel
	82	by writing the appropriate stream of bytes to a configfs attribute.
	83
71adf118 FC	84	Send and receive HID reports
	85
	86	HID reports can be sent/received using read/write on the
	87	/dev/hidgX character devices. See below for an example program
	88	to do this.
	89
	90	hid_gadget_test is a small interactive program to test the HID
6e7be1a0 TK	91	gadget driver. To use, point it at a hidg device and set the
6e7be1a0 TK	92	device type (keyboard / mouse / joystick) - E.G.:
71adf118 FC	93
	94	# hid_gadget_test /dev/hidg0 keyboard
	95
	96	You are now in the prompt of hid_gadget_test. You can type any
	97	combination of options and values. Available options and
	98	values are listed at program start. In keyboard mode you can
	99	send up to six values.
	100
	101	For example type: g i s t r --left-shift
	102
	103	Hit return and the corresponding report will be sent by the
	104	HID gadget.
	105
	106	Another interesting example is the caps lock test. Type
6e7be1a0	107	--caps-lock and hit return. A report is then sent by the
71adf118 FC	108	gadget and you should receive the host answer, corresponding
	109	to the caps lock LED status.
	110
	111	--caps-lock
	112	recv report:2
	113
	114	With this command:
	115
	116	# hid_gadget_test /dev/hidg1 mouse
	117
	118	You can test the mouse emulation. Values are two signed numbers.
	119
	120
	121	Sample code
	122
	123	/* hid_gadget_test */
	124
	125	#include <pthread.h>
	126	#include <string.h>
	127	#include <stdio.h>
	128	#include <ctype.h>
	129	#include <fcntl.h>
	130	#include <errno.h>
	131	#include <stdio.h>
	132	#include <stdlib.h>
	133	#include <unistd.h>
	134
	135	#define BUF_LEN 512
	136
	137	struct options {
	138	const char *opt;
	139	unsigned char val;
	140	};
	141
	142	static struct options kmod[] = {
	143	{.opt = "--left-ctrl", .val = 0x01},
	144	{.opt = "--right-ctrl", .val = 0x10},
	145	{.opt = "--left-shift", .val = 0x02},
	146	{.opt = "--right-shift", .val = 0x20},
	147	{.opt = "--left-alt", .val = 0x04},
	148	{.opt = "--right-alt", .val = 0x40},
	149	{.opt = "--left-meta", .val = 0x08},
	150	{.opt = "--right-meta", .val = 0x80},
	151	{.opt = NULL}
	152	};
	153
	154	static struct options kval[] = {
	155	{.opt = "--return", .val = 0x28},
	156	{.opt = "--esc", .val = 0x29},
	157	{.opt = "--bckspc", .val = 0x2a},
	158	{.opt = "--tab", .val = 0x2b},
	159	{.opt = "--spacebar", .val = 0x2c},
	160	{.opt = "--caps-lock", .val = 0x39},
	161	{.opt = "--f1", .val = 0x3a},
	162	{.opt = "--f2", .val = 0x3b},
	163	{.opt = "--f3", .val = 0x3c},
	164	{.opt = "--f4", .val = 0x3d},
	165	{.opt = "--f5", .val = 0x3e},
	166	{.opt = "--f6", .val = 0x3f},
	167	{.opt = "--f7", .val = 0x40},
	168	{.opt = "--f8", .val = 0x41},
	169	{.opt = "--f9", .val = 0x42},
	170	{.opt = "--f10", .val = 0x43},
	171	{.opt = "--f11", .val = 0x44},
172	{.opt = "--f12", .val = 0x45},
173	{.opt = "--insert", .val = 0x49},
174	{.opt = "--home", .val = 0x4a},
175	{.opt = "--pageup", .val = 0x4b},
176	{.opt = "--del", .val = 0x4c},
177	{.opt = "--end", .val = 0x4d},
178	{.opt = "--pagedown", .val = 0x4e},
179	{.opt = "--right", .val = 0x4f},
180	{.opt = "--left", .val = 0x50},
181	{.opt = "--down", .val = 0x51},
182	{.opt = "--kp-enter", .val = 0x58},
183	{.opt = "--up", .val = 0x52},
184	{.opt = "--num-lock", .val = 0x53},
185	{.opt = NULL}
186	};
187
188	int keyboard_fill_report(char report[8], char buf[BUF_LEN], int *hold)
189	{
190	char *tok = strtok(buf, " ");
191	int key = 0;
192	int i = 0;
193
194	for (; tok != NULL; tok = strtok(NULL, " ")) {
195
196	if (strcmp(tok, "--quit") == 0)
197	return -1;
198
199	if (strcmp(tok, "--hold") == 0) {
200	*hold = 1;
201	continue;
202	}
203
204	if (key < 6) {
205	for (i = 0; kval[i].opt != NULL; i++)
206	if (strcmp(tok, kval[i].opt) == 0) {
207	report[2 + key++] = kval[i].val;
208	break;
209	}
210	if (kval[i].opt != NULL)
211	continue;
212	}
213
214	if (key < 6)
215	if (islower(tok[0])) {
216	report[2 + key++] = (tok[0] - ('a' - 0x04));
217	continue;
218	}
219
220	for (i = 0; kmod[i].opt != NULL; i++)
221	if (strcmp(tok, kmod[i].opt) == 0) {
222	report[0] = report[0] \| kmod[i].val;
223	break;
224	}
225	if (kmod[i].opt != NULL)
226	continue;
227
228	if (key < 6)
229	fprintf(stderr, "unknown option: %s\n", tok);
230	}
231	return 8;
232	}
233
234	static struct options mmod[] = {
235	{.opt = "--b1", .val = 0x01},
236	{.opt = "--b2", .val = 0x02},
237	{.opt = "--b3", .val = 0x04},
238	{.opt = NULL}
239	};
240
241	int mouse_fill_report(char report[8], char buf[BUF_LEN], int *hold)
242	{
243	char *tok = strtok(buf, " ");
244	int mvt = 0;
245	int i = 0;
246	for (; tok != NULL; tok = strtok(NULL, " ")) {
247
248	if (strcmp(tok, "--quit") == 0)
249	return -1;
250
251	if (strcmp(tok, "--hold") == 0) {
252	*hold = 1;
253	continue;
254	}
255
256	for (i = 0; mmod[i].opt != NULL; i++)
257	if (strcmp(tok, mmod[i].opt) == 0) {
258	report[0] = report[0] \| mmod[i].val;
259	break;
260	}
261	if (mmod[i].opt != NULL)
262	continue;
263
264	if (!(tok[0] == '-' && tok[1] == '-') && mvt < 2) {
265	errno = 0;
266	report[1 + mvt++] = (char)strtol(tok, NULL, 0);
267	if (errno != 0) {
268	fprintf(stderr, "Bad value:'%s'\n", tok);
269	report[1 + mvt--] = 0;
270	}
271	continue;
272	}
273
274	fprintf(stderr, "unknown option: %s\n", tok);
275	}
276	return 3;
277	}
278
279	static struct options jmod[] = {
280	{.opt = "--b1", .val = 0x10},
281	{.opt = "--b2", .val = 0x20},
282	{.opt = "--b3", .val = 0x40},
283	{.opt = "--b4", .val = 0x80},
284	{.opt = "--hat1", .val = 0x00},
285	{.opt = "--hat2", .val = 0x01},
286	{.opt = "--hat3", .val = 0x02},
287	{.opt = "--hat4", .val = 0x03},
288	{.opt = "--hatneutral", .val = 0x04},
289	{.opt = NULL}
290	};
291
292	int joystick_fill_report(char report[8], char buf[BUF_LEN], int *hold)
293	{
294	char *tok = strtok(buf, " ");
295	int mvt = 0;
296	int i = 0;
297
298	*hold = 1;
299
300	/* set default hat position: neutral */
301	report[3] = 0x04;
302
303	for (; tok != NULL; tok = strtok(NULL, " ")) {
304
305	if (strcmp(tok, "--quit") == 0)
306	return -1;
307
308	for (i = 0; jmod[i].opt != NULL; i++)
309	if (strcmp(tok, jmod[i].opt) == 0) {
310	report[3] = (report[3] & 0xF0) \| jmod[i].val;
311	break;
312	}
313	if (jmod[i].opt != NULL)
314	continue;
315
316	if (!(tok[0] == '-' && tok[1] == '-') && mvt < 3) {
317	errno = 0;
318	report[mvt++] = (char)strtol(tok, NULL, 0);
319	if (errno != 0) {
320	fprintf(stderr, "Bad value:'%s'\n", tok);
321	report[mvt--] = 0;
322	}
323	continue;
324	}
325
326	fprintf(stderr, "unknown option: %s\n", tok);
327	}
328	return 4;
329	}
330
331	void print_options(char c)
332	{
333	int i = 0;
334
335	if (c == 'k') {
336	printf(" keyboard options:\n"
337	" --hold\n");
338	for (i = 0; kmod[i].opt != NULL; i++)
339	printf("\t\t%s\n", kmod[i].opt);
340	printf("\n keyboard values:\n"
341	" [a-z] or\n");
342	for (i = 0; kval[i].opt != NULL; i++)
343	printf("\t\t%-8s%s", kval[i].opt, i % 2 ? "\n" : "");
344	printf("\n");
345	} else if (c == 'm') {
346	printf(" mouse options:\n"
347	" --hold\n");
348	for (i = 0; mmod[i].opt != NULL; i++)
349	printf("\t\t%s\n", mmod[i].opt);
350	printf("\n mouse values:\n"
351	" Two signed numbers\n"
352	"--quit to close\n");
353	} else {
354	printf(" joystick options:\n");
355	for (i = 0; jmod[i].opt != NULL; i++)
356	printf("\t\t%s\n", jmod[i].opt);
357	printf("\n joystick values:\n"
358	" three signed numbers\n"
359	"--quit to close\n");
360	}
361	}
362
363	int main(int argc, const char *argv[])
364	{
365	const char *filename = NULL;
366	int fd = 0;
367	char buf[BUF_LEN];
368	int cmd_len;
369	char report[8];
370	int to_send = 8;
371	int hold = 0;
372	fd_set rfds;
373	int retval, i;
374
375	if (argc < 3) {
376	fprintf(stderr, "Usage: %s devname mouse\|keyboard\|joystick\n",
377	argv[0]);
378	return 1;
379	}
380
381	if (argv[2][0] != 'k' && argv[2][0] != 'm' && argv[2][0] != 'j')
382	return 2;
383
384	filename = argv[1];
385
386	if ((fd = open(filename, O_RDWR, 0666)) == -1) {
387	perror(filename);
388	return 3;
389	}
390
391	print_options(argv[2][0]);
392
393	while (42) {
394
395	FD_ZERO(&rfds);
396	FD_SET(STDIN_FILENO, &rfds);
397	FD_SET(fd, &rfds);
398
399	retval = select(fd + 1, &rfds, NULL, NULL, NULL);
400	if (retval == -1 && errno == EINTR)
401	continue;
402	if (retval < 0) {
403	perror("select()");
404	return 4;
405	}
406
407	if (FD_ISSET(fd, &rfds)) {
408	cmd_len = read(fd, buf, BUF_LEN - 1);
409	printf("recv report:");
410	for (i = 0; i < cmd_len; i++)
411	printf(" %02x", buf[i]);
412	printf("\n");
413	}
414
415	if (FD_ISSET(STDIN_FILENO, &rfds)) {
416	memset(report, 0x0, sizeof(report));
417	cmd_len = read(STDIN_FILENO, buf, BUF_LEN - 1);
418
419	if (cmd_len == 0)
420	break;
421
422	buf[cmd_len - 1] = '\0';
423	hold = 0;
424
425	memset(report, 0x0, sizeof(report));
426	if (argv[2][0] == 'k')
427	to_send = keyboard_fill_report(report, buf, &hold);
428	else if (argv[2][0] == 'm')
429	to_send = mouse_fill_report(report, buf, &hold);
430	else
431	to_send = joystick_fill_report(report, buf, &hold);
432
433	if (to_send == -1)
434	break;
435
436	if (write(fd, report, to_send) != to_send) {
437	perror(filename);
438	return 5;
439	}
440	if (!hold) {
441	memset(report, 0x0, sizeof(report));
442	if (write(fd, report, to_send) != to_send) {
443	perror(filename);
444	return 6;
445	}
446	}
447	}
448	}
449
450	close(fd);
451	return 0;
452	}