chardev/char-parallel.c - qemu - Git at Google

 /*
  * QEMU System Emulator
  *
  * Copyright (c) 2003-2008 Fabrice Bellard
  *
  * 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 "chardev/char.h"
 #include "qapi/error.h"
 #include "qemu/module.h"
 #include "qemu/option.h"
 #include <sys/ioctl.h>

 #ifdef CONFIG_BSD
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 #include <dev/ppbus/ppi.h>
 #include <dev/ppbus/ppbconf.h>
 #elif defined(__DragonFly__)
 #include <dev/misc/ppi/ppi.h>
 #include <bus/ppbus/ppbconf.h>
 #endif
 #else
 #ifdef __linux__
 #include <linux/ppdev.h>
 #include <linux/parport.h>
 #endif
 #endif

 #include "chardev/char-fd.h"
 #include "chardev/char-parallel.h"

 #if defined(__linux__)

 typedef struct {
     Chardev parent;
     int fd;
     int mode;
 } ParallelChardev;

 #define PARALLEL_CHARDEV(obj) \
     OBJECT_CHECK(ParallelChardev, (obj), TYPE_CHARDEV_PARALLEL)

 static int pp_hw_mode(ParallelChardev *s, uint16_t mode)
 {
     if (s->mode != mode) {
         int m = mode;
         if (ioctl(s->fd, PPSETMODE, &m) < 0) {
             return 0;
         }
         s->mode = mode;
     }
     return 1;
 }

 static int pp_ioctl(Chardev *chr, int cmd, void *arg)
 {
     ParallelChardev *drv = PARALLEL_CHARDEV(chr);
     int fd = drv->fd;
     uint8_t b;

     switch (cmd) {
     case CHR_IOCTL_PP_READ_DATA:
         if (ioctl(fd, PPRDATA, &b) < 0) {
             return -ENOTSUP;
         }
         *(uint8_t *)arg = b;
         break;
     case CHR_IOCTL_PP_WRITE_DATA:
         b = *(uint8_t *)arg;
         if (ioctl(fd, PPWDATA, &b) < 0) {
             return -ENOTSUP;
         }
         break;
     case CHR_IOCTL_PP_READ_CONTROL:
         if (ioctl(fd, PPRCONTROL, &b) < 0) {
             return -ENOTSUP;
         }
         /* Linux gives only the lowest bits, and no way to know data
            direction! For better compatibility set the fixed upper
            bits. */
         *(uint8_t *)arg = b | 0xc0;
         break;
     case CHR_IOCTL_PP_WRITE_CONTROL:
         b = *(uint8_t *)arg;
         if (ioctl(fd, PPWCONTROL, &b) < 0) {
             return -ENOTSUP;
         }
         break;
     case CHR_IOCTL_PP_READ_STATUS:
         if (ioctl(fd, PPRSTATUS, &b) < 0) {
             return -ENOTSUP;
         }
         *(uint8_t *)arg = b;
         break;
     case CHR_IOCTL_PP_DATA_DIR:
         if (ioctl(fd, PPDATADIR, (int *)arg) < 0) {
             return -ENOTSUP;
         }
         break;
     case CHR_IOCTL_PP_EPP_READ_ADDR:
         if (pp_hw_mode(drv, IEEE1284_MODE_EPP | IEEE1284_ADDR)) {
             struct ParallelIOArg *parg = arg;
             int n = read(fd, parg->buffer, parg->count);
             if (n != parg->count) {
                 return -EIO;
             }
         }
         break;
     case CHR_IOCTL_PP_EPP_READ:
         if (pp_hw_mode(drv, IEEE1284_MODE_EPP)) {
             struct ParallelIOArg *parg = arg;
             int n = read(fd, parg->buffer, parg->count);
             if (n != parg->count) {
                 return -EIO;
             }
         }
         break;
     case CHR_IOCTL_PP_EPP_WRITE_ADDR:
         if (pp_hw_mode(drv, IEEE1284_MODE_EPP | IEEE1284_ADDR)) {
             struct ParallelIOArg *parg = arg;
             int n = write(fd, parg->buffer, parg->count);
             if (n != parg->count) {
                 return -EIO;
             }
         }
         break;
     case CHR_IOCTL_PP_EPP_WRITE:
         if (pp_hw_mode(drv, IEEE1284_MODE_EPP)) {
             struct ParallelIOArg *parg = arg;
             int n = write(fd, parg->buffer, parg->count);
             if (n != parg->count) {
                 return -EIO;
             }
         }
         break;
     default:
         return -ENOTSUP;
     }
     return 0;
 }

 static void qemu_chr_open_pp_fd(Chardev *chr,
                                 int fd,
                                 bool *be_opened,
                                 Error **errp)
 {
     ParallelChardev *drv = PARALLEL_CHARDEV(chr);

     if (ioctl(fd, PPCLAIM) < 0) {
         error_setg_errno(errp, errno, "not a parallel port");
         close(fd);
         return;
     }

     drv->fd = fd;
     drv->mode = IEEE1284_MODE_COMPAT;
 }
 #endif /* __linux__ */

 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)

 typedef struct {
     Chardev parent;
     int fd;
 } ParallelChardev;

 #define PARALLEL_CHARDEV(obj)                                   \
     OBJECT_CHECK(ParallelChardev, (obj), TYPE_CHARDEV_PARALLEL)

 static int pp_ioctl(Chardev *chr, int cmd, void *arg)
 {
     ParallelChardev *drv = PARALLEL_CHARDEV(chr);
     uint8_t b;

     switch (cmd) {
     case CHR_IOCTL_PP_READ_DATA:
         if (ioctl(drv->fd, PPIGDATA, &b) < 0) {
             return -ENOTSUP;
         }
         *(uint8_t *)arg = b;
         break;
     case CHR_IOCTL_PP_WRITE_DATA:
         b = *(uint8_t *)arg;
         if (ioctl(drv->fd, PPISDATA, &b) < 0) {
             return -ENOTSUP;
         }
         break;
     case CHR_IOCTL_PP_READ_CONTROL:
         if (ioctl(drv->fd, PPIGCTRL, &b) < 0) {
             return -ENOTSUP;
         }
         *(uint8_t *)arg = b;
         break;
     case CHR_IOCTL_PP_WRITE_CONTROL:
         b = *(uint8_t *)arg;
         if (ioctl(drv->fd, PPISCTRL, &b) < 0) {
             return -ENOTSUP;
         }
         break;
     case CHR_IOCTL_PP_READ_STATUS:
         if (ioctl(drv->fd, PPIGSTATUS, &b) < 0) {
             return -ENOTSUP;
         }
         *(uint8_t *)arg = b;
         break;
     default:
         return -ENOTSUP;
     }
     return 0;
 }

 static void qemu_chr_open_pp_fd(Chardev *chr,
                                 int fd,
                                 bool *be_opened,
                                 Error **errp)
 {
     ParallelChardev *drv = PARALLEL_CHARDEV(chr);
     drv->fd = fd;
     *be_opened = false;
 }
 #endif

 static void qmp_chardev_open_parallel(Chardev *chr,
                                       ChardevBackend *backend,
                                       bool *be_opened,
                                       Error **errp)
 {
     ChardevHostdev *parallel = backend->u.parallel.data;
     int fd;

     fd = qmp_chardev_open_file_source(parallel->device, O_RDWR, errp);
     if (fd < 0) {
         return;
     }
     qemu_chr_open_pp_fd(chr, fd, be_opened, errp);
 }

 static void qemu_chr_parse_parallel(QemuOpts *opts, ChardevBackend *backend,
                                     Error **errp)
 {
     const char *device = qemu_opt_get(opts, "path");
     ChardevHostdev *parallel;

     if (device == NULL) {
         error_setg(errp, "chardev: parallel: no device path given");
         return;
     }
     backend->type = CHARDEV_BACKEND_KIND_PARALLEL;
     parallel = backend->u.parallel.data = g_new0(ChardevHostdev, 1);
     qemu_chr_parse_common(opts, qapi_ChardevHostdev_base(parallel));
     parallel->device = g_strdup(device);
 }

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

     cc->parse = qemu_chr_parse_parallel;
     cc->open = qmp_chardev_open_parallel;
     cc->chr_ioctl = pp_ioctl;
 }

 static void char_parallel_finalize(Object *obj)
 {
     Chardev *chr = CHARDEV(obj);
     ParallelChardev *drv = PARALLEL_CHARDEV(chr);
     int fd = drv->fd;

 #if defined(__linux__)
     pp_hw_mode(drv, IEEE1284_MODE_COMPAT);
     ioctl(fd, PPRELEASE);
 #endif
     close(fd);
     qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
 }

 static const TypeInfo char_parallel_type_info = {
     .name = TYPE_CHARDEV_PARALLEL,
     .parent = TYPE_CHARDEV,
     .instance_size = sizeof(ParallelChardev),
     .instance_finalize = char_parallel_finalize,
     .class_init = char_parallel_class_init,
 };

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

 type_init(register_types);
	/*
	* QEMU System Emulator
	*
	* Copyright (c) 2003-2008 Fabrice Bellard
	*
	* 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 "chardev/char.h"
	#include "qapi/error.h"
	#include "qemu/module.h"
	#include "qemu/option.h"
	#include <sys/ioctl.h>

	#ifdef CONFIG_BSD
	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
	#include <dev/ppbus/ppi.h>
	#include <dev/ppbus/ppbconf.h>
	#elif defined(__DragonFly__)
	#include <dev/misc/ppi/ppi.h>
	#include <bus/ppbus/ppbconf.h>
	#endif
	#else
	#ifdef __linux__
	#include <linux/ppdev.h>
	#include <linux/parport.h>
	#endif
	#endif

	#include "chardev/char-fd.h"
	#include "chardev/char-parallel.h"

	#if defined(__linux__)

	typedef struct {
	Chardev parent;
	int fd;
	int mode;
	} ParallelChardev;

	#define PARALLEL_CHARDEV(obj) \
	OBJECT_CHECK(ParallelChardev, (obj), TYPE_CHARDEV_PARALLEL)

	static int pp_hw_mode(ParallelChardev *s, uint16_t mode)
	{
	if (s->mode != mode) {
	int m = mode;
	if (ioctl(s->fd, PPSETMODE, &m) < 0) {
	return 0;
	}
	s->mode = mode;
	}
	return 1;
	}

	static int pp_ioctl(Chardev chr, int cmd, void arg)
	{
	ParallelChardev *drv = PARALLEL_CHARDEV(chr);
	int fd = drv->fd;
	uint8_t b;

	switch (cmd) {
	case CHR_IOCTL_PP_READ_DATA:
	if (ioctl(fd, PPRDATA, &b) < 0) {
	return -ENOTSUP;
	}
	(uint8_t )arg = b;
	break;
	case CHR_IOCTL_PP_WRITE_DATA:
	b = (uint8_t )arg;
	if (ioctl(fd, PPWDATA, &b) < 0) {
	return -ENOTSUP;
	}
	break;
	case CHR_IOCTL_PP_READ_CONTROL:
	if (ioctl(fd, PPRCONTROL, &b) < 0) {
	return -ENOTSUP;
	}
	/* Linux gives only the lowest bits, and no way to know data
	direction! For better compatibility set the fixed upper
	bits. */
	(uint8_t )arg = b \| 0xc0;
	break;
	case CHR_IOCTL_PP_WRITE_CONTROL:
	b = (uint8_t )arg;
	if (ioctl(fd, PPWCONTROL, &b) < 0) {
	return -ENOTSUP;
	}
	break;
	case CHR_IOCTL_PP_READ_STATUS:
	if (ioctl(fd, PPRSTATUS, &b) < 0) {
	return -ENOTSUP;
	}
	(uint8_t )arg = b;
	break;
	case CHR_IOCTL_PP_DATA_DIR:
	if (ioctl(fd, PPDATADIR, (int *)arg) < 0) {
	return -ENOTSUP;
	}
	break;
	case CHR_IOCTL_PP_EPP_READ_ADDR:
	if (pp_hw_mode(drv, IEEE1284_MODE_EPP \| IEEE1284_ADDR)) {
	struct ParallelIOArg *parg = arg;
	int n = read(fd, parg->buffer, parg->count);
	if (n != parg->count) {
	return -EIO;
	}
	}
	break;
	case CHR_IOCTL_PP_EPP_READ:
	if (pp_hw_mode(drv, IEEE1284_MODE_EPP)) {
	struct ParallelIOArg *parg = arg;
	int n = read(fd, parg->buffer, parg->count);
	if (n != parg->count) {
	return -EIO;
	}
	}
	break;
	case CHR_IOCTL_PP_EPP_WRITE_ADDR:
	if (pp_hw_mode(drv, IEEE1284_MODE_EPP \| IEEE1284_ADDR)) {
	struct ParallelIOArg *parg = arg;
	int n = write(fd, parg->buffer, parg->count);
	if (n != parg->count) {
	return -EIO;
	}
	}
	break;
	case CHR_IOCTL_PP_EPP_WRITE:
	if (pp_hw_mode(drv, IEEE1284_MODE_EPP)) {
	struct ParallelIOArg *parg = arg;
	int n = write(fd, parg->buffer, parg->count);
	if (n != parg->count) {
	return -EIO;
	}
	}
	break;
	default:
	return -ENOTSUP;
	}
	return 0;
	}

	static void qemu_chr_open_pp_fd(Chardev *chr,
	int fd,
	bool *be_opened,
	Error **errp)
	{
	ParallelChardev *drv = PARALLEL_CHARDEV(chr);

	if (ioctl(fd, PPCLAIM) < 0) {
	error_setg_errno(errp, errno, "not a parallel port");
	close(fd);
	return;
	}

	drv->fd = fd;
	drv->mode = IEEE1284_MODE_COMPAT;
	}
	#endif /* __linux__ */

	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__) \|\| defined(__DragonFly__)

	typedef struct {
	Chardev parent;
	int fd;
	} ParallelChardev;

	#define PARALLEL_CHARDEV(obj) \
	OBJECT_CHECK(ParallelChardev, (obj), TYPE_CHARDEV_PARALLEL)

	static int pp_ioctl(Chardev chr, int cmd, void arg)
	{
	ParallelChardev *drv = PARALLEL_CHARDEV(chr);
	uint8_t b;

	switch (cmd) {
	case CHR_IOCTL_PP_READ_DATA:
	if (ioctl(drv->fd, PPIGDATA, &b) < 0) {
	return -ENOTSUP;
	}
	(uint8_t )arg = b;
	break;
	case CHR_IOCTL_PP_WRITE_DATA:
	b = (uint8_t )arg;
	if (ioctl(drv->fd, PPISDATA, &b) < 0) {
	return -ENOTSUP;
	}
	break;
	case CHR_IOCTL_PP_READ_CONTROL:
	if (ioctl(drv->fd, PPIGCTRL, &b) < 0) {
	return -ENOTSUP;
	}
	(uint8_t )arg = b;
	break;
	case CHR_IOCTL_PP_WRITE_CONTROL:
	b = (uint8_t )arg;
	if (ioctl(drv->fd, PPISCTRL, &b) < 0) {
	return -ENOTSUP;
	}
	break;
	case CHR_IOCTL_PP_READ_STATUS:
	if (ioctl(drv->fd, PPIGSTATUS, &b) < 0) {
	return -ENOTSUP;
	}
	(uint8_t )arg = b;
	break;
	default:
	return -ENOTSUP;
	}
	return 0;
	}

	static void qemu_chr_open_pp_fd(Chardev *chr,
	int fd,
	bool *be_opened,
	Error **errp)
	{
	ParallelChardev *drv = PARALLEL_CHARDEV(chr);
	drv->fd = fd;
	*be_opened = false;
	}
	#endif

	static void qmp_chardev_open_parallel(Chardev *chr,
	ChardevBackend *backend,
	bool *be_opened,
	Error **errp)
	{
	ChardevHostdev *parallel = backend->u.parallel.data;
	int fd;

	fd = qmp_chardev_open_file_source(parallel->device, O_RDWR, errp);
	if (fd < 0) {
	return;
	}
	qemu_chr_open_pp_fd(chr, fd, be_opened, errp);
	}

	static void qemu_chr_parse_parallel(QemuOpts opts, ChardevBackend backend,
	Error **errp)
	{
	const char *device = qemu_opt_get(opts, "path");
	ChardevHostdev *parallel;

	if (device == NULL) {
	error_setg(errp, "chardev: parallel: no device path given");
	return;
	}
	backend->type = CHARDEV_BACKEND_KIND_PARALLEL;
	parallel = backend->u.parallel.data = g_new0(ChardevHostdev, 1);
	qemu_chr_parse_common(opts, qapi_ChardevHostdev_base(parallel));
	parallel->device = g_strdup(device);
	}

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

	cc->parse = qemu_chr_parse_parallel;
	cc->open = qmp_chardev_open_parallel;
	cc->chr_ioctl = pp_ioctl;
	}

	static void char_parallel_finalize(Object *obj)
	{
	Chardev *chr = CHARDEV(obj);
	ParallelChardev *drv = PARALLEL_CHARDEV(chr);
	int fd = drv->fd;

	#if defined(__linux__)
	pp_hw_mode(drv, IEEE1284_MODE_COMPAT);
	ioctl(fd, PPRELEASE);
	#endif
	close(fd);
	qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
	}

	static const TypeInfo char_parallel_type_info = {
	.name = TYPE_CHARDEV_PARALLEL,
	.parent = TYPE_CHARDEV,
	.instance_size = sizeof(ParallelChardev),
	.instance_finalize = char_parallel_finalize,
	.class_init = char_parallel_class_init,
	};

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

	type_init(register_types);