tty_io.c (bbb63c514a3464342967237a51a21ea8f61ab951) tty_io.c (6915c0e487c822e2436683e14302c0b8a6155cc7)
1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5/*
6 * 'tty_io.c' gives an orthogonal feeling to tty's, be they consoles
7 * or rs-channels. It also implements echoing, cooked mode etc.
8 *

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3036 * driver.
3037 *
3038 * Locking: ??
3039 */
3040
3041struct device *tty_register_device(struct tty_driver *driver, unsigned index,
3042 struct device *device)
3043{
1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5/*
6 * 'tty_io.c' gives an orthogonal feeling to tty's, be they consoles
7 * or rs-channels. It also implements echoing, cooked mode etc.
8 *

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3036 * driver.
3037 *
3038 * Locking: ??
3039 */
3040
3041struct device *tty_register_device(struct tty_driver *driver, unsigned index,
3042 struct device *device)
3043{
3044 struct device *ret;
3044 return tty_register_device_attr(driver, index, device, NULL, NULL);
3045}
3046EXPORT_SYMBOL(tty_register_device);
3047
3048/**
3049 * tty_register_device_attr - register a tty device
3050 * @driver: the tty driver that describes the tty device
3051 * @index: the index in the tty driver for this tty device
3052 * @device: a struct device that is associated with this tty device.
3053 * This field is optional, if there is no known struct device
3054 * for this tty device it can be set to NULL safely.
3055 * @drvdata: Driver data to be set to device.
3056 * @attr_grp: Attribute group to be set on device.
3057 *
3058 * Returns a pointer to the struct device for this tty device
3059 * (or ERR_PTR(-EFOO) on error).
3060 *
3061 * This call is required to be made to register an individual tty device
3062 * if the tty driver's flags have the TTY_DRIVER_DYNAMIC_DEV bit set. If
3063 * that bit is not set, this function should not be called by a tty
3064 * driver.
3065 *
3066 * Locking: ??
3067 */
3068struct device *tty_register_device_attr(struct tty_driver *driver,
3069 unsigned index, struct device *device,
3070 void *drvdata,
3071 const struct attribute_group **attr_grp)
3072{
3045 char name[64];
3073 char name[64];
3046 dev_t dev = MKDEV(driver->major, driver->minor_start) + index;
3074 dev_t devt = MKDEV(driver->major, driver->minor_start) + index;
3075 struct device *dev = NULL;
3076 int retval = -ENODEV;
3047 bool cdev = false;
3048
3049 if (index >= driver->num) {
3050 printk(KERN_ERR "Attempt to register invalid tty line number "
3051 " (%d).\n", index);
3052 return ERR_PTR(-EINVAL);
3053 }
3054
3055 if (driver->type == TTY_DRIVER_TYPE_PTY)
3056 pty_line_name(driver, index, name);
3057 else
3058 tty_line_name(driver, index, name);
3059
3060 if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) {
3077 bool cdev = false;
3078
3079 if (index >= driver->num) {
3080 printk(KERN_ERR "Attempt to register invalid tty line number "
3081 " (%d).\n", index);
3082 return ERR_PTR(-EINVAL);
3083 }
3084
3085 if (driver->type == TTY_DRIVER_TYPE_PTY)
3086 pty_line_name(driver, index, name);
3087 else
3088 tty_line_name(driver, index, name);
3089
3090 if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) {
3061 int error = tty_cdev_add(driver, dev, index, 1);
3062 if (error)
3063 return ERR_PTR(error);
3091 retval = tty_cdev_add(driver, devt, index, 1);
3092 if (retval)
3093 goto error;
3064 cdev = true;
3065 }
3066
3094 cdev = true;
3095 }
3096
3067 ret = device_create(tty_class, device, dev, NULL, name);
3068 if (IS_ERR(ret) && cdev)
3069 cdev_del(&driver->cdevs[index]);
3097 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3098 if (!dev) {
3099 retval = -ENOMEM;
3100 goto error;
3101 }
3070
3102
3071 return ret;
3103 dev->devt = devt;
3104 dev->class = tty_class;
3105 dev->parent = device;
3106 dev_set_name(dev, "%s", name);
3107 dev->groups = attr_grp;
3108 dev_set_drvdata(dev, drvdata);
3109
3110 retval = device_register(dev);
3111 if (retval)
3112 goto error;
3113
3114 return dev;
3115
3116error:
3117 put_device(dev);
3118 if (cdev)
3119 cdev_del(&driver->cdevs[index]);
3120 return ERR_PTR(retval);
3072}
3121}
3073EXPORT_SYMBOL(tty_register_device);
3122EXPORT_SYMBOL_GPL(tty_register_device_attr);
3074
3075/**
3076 * tty_unregister_device - unregister a tty device
3077 * @driver: the tty driver that describes the tty device
3078 * @index: the index in the tty driver for this tty device
3079 *
3080 * If a tty device is registered with a call to tty_register_device() then
3081 * this function must be called when the tty device is gone.

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3124/**
3125 * tty_unregister_device - unregister a tty device
3126 * @driver: the tty driver that describes the tty device
3127 * @index: the index in the tty driver for this tty device
3128 *
3129 * If a tty device is registered with a call to tty_register_device() then
3130 * this function must be called when the tty device is gone.

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