From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Antonino A. Daplas" Subject: [PATCH 2/5] VT binding: Add sysfs support Date: Fri, 09 Jun 2006 16:39:51 +0800 Message-ID: <448933D7.6040301@gmail.com> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1Focac-0005J6-GB for linux-fbdev-devel@lists.sourceforge.net; Fri, 09 Jun 2006 01:43:34 -0700 Received: from py-out-1112.google.com ([64.233.166.178]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1Focac-0002g3-65 for linux-fbdev-devel@lists.sourceforge.net; Fri, 09 Jun 2006 01:43:34 -0700 Received: by py-out-1112.google.com with SMTP id x31so892948pye for ; Fri, 09 Jun 2006 01:43:33 -0700 (PDT) List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-fbdev-devel-bounces@lists.sourceforge.net Errors-To: linux-fbdev-devel-bounces@lists.sourceforge.net To: Andrew Morton Cc: Greg KH , Linux Fbdev development list , Linux Kernel Development Add sysfs attributes for binding and unbinding VT console drivers. The attributes are located in /sys/class/tty/console and are namely: A. backend - list registered drivers in the following format: "I C: Description" Where: I = ID number of the driver C = status of the driver which can be: S = system driver B = bound modular driver U = unbound modular driver Description - text description of the driver B. bind - binds a driver to the console layer echo > /sys/class/tty/console/bind C. unbind - unbinds a driver from the console layer echo > /sys/class/tty/console/unbind The tty layer does nothing to these attributes except create them and punt all requests to the VT layer. Signed-off-by: Antonino Daplas --- drivers/char/tty_io.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++- include/linux/tty.h | 19 ++++++++++++++++++ 2 files changed, 71 insertions(+), 1 deletions(-) diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index a5730a6..e23d360 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -3231,6 +3231,47 @@ #ifdef CONFIG_VT static struct cdev vc0_cdev; #endif +static ssize_t store_bind(struct class_device *class_device, + const char *buf, size_t count) +{ + int index = simple_strtoul(buf, NULL, 0); + + vt_bind(index); + return count; +} + +static ssize_t store_unbind(struct class_device *class_device, + const char *buf, size_t count) +{ + int index = simple_strtoul(buf, NULL, 0); + + vt_unbind(index); + return count; +} + +static ssize_t show_con_drivers(struct class_device *class_device, char *buf) +{ + return vt_show_drivers(buf); +} + +static struct class_device_attribute class_device_attrs[] = { + __ATTR(bind, S_IWUSR, NULL, store_bind), + __ATTR(unbind, S_IWUSR, NULL, store_unbind), + __ATTR(backend, S_IRUGO, show_con_drivers, NULL), +}; + +static struct class_device *console_class_device; + +static int console_init_class_device(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) + class_device_create_file(console_class_device, + &class_device_attrs[i]); + return 0; +} + /* * Ok, now we can initialize the rest of the tty devices and can count * on memory allocations, interrupts etc.. @@ -3249,7 +3290,17 @@ static int __init tty_init(void) register_chrdev_region(MKDEV(TTYAUX_MAJOR, 1), 1, "/dev/console") < 0) panic("Couldn't register /dev/console driver\n"); devfs_mk_cdev(MKDEV(TTYAUX_MAJOR, 1), S_IFCHR|S_IRUSR|S_IWUSR, "console"); - class_device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 1), NULL, "console"); + console_class_device = class_device_create(tty_class, NULL, + MKDEV(TTYAUX_MAJOR, 1), + NULL, "console"); + if (IS_ERR(console_class_device)) { + printk(KERN_WARNING "Unable to create class device " + "for console; errno = %ldn", + PTR_ERR(console_class_device)); + console_class_device = NULL; + } else + console_init_class_device(); + #ifdef CONFIG_UNIX98_PTYS cdev_init(&ptmx_cdev, &ptmx_fops); diff --git a/include/linux/tty.h b/include/linux/tty.h index cb35ca5..3edaa5d 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -347,6 +347,25 @@ extern void console_print(const char *); extern int vt_ioctl(struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg); +#ifdef CONFIG_VT +extern int vt_bind(int index); +extern int vt_unbind(int index); +extern int vt_show_drivers(char *buf); +#else +static inline int vt_bind(int index) +{ + return 0; +} +static inline int vt_unbind(int index) +{ + return 0; +} +static inline int vt_show_drivers(char *buf) +{ + return 0; +} +#endif + static inline dev_t tty_devnum(struct tty_struct *tty) { return MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;