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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 846 | giacomo | 1 | /* |
| 2 | * USB Serial Converter Bus specific functions |
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| 3 | * |
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| 4 | * Copyright (C) 2002 Greg Kroah-Hartman (greg@kroah.com) |
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| 5 | * |
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| 6 | * This program is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU General Public License version |
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| 8 | * 2 as published by the Free Software Foundation. |
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| 9 | */ |
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| 10 | |||
| 11 | #include <linuxcomp.h> |
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| 12 | |||
| 13 | #include <linux/config.h> |
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| 14 | #include <linux/kernel.h> |
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| 15 | #include <linux/errno.h> |
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| 16 | #include <linux/tty.h> |
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| 17 | #include <linux/module.h> |
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| 18 | #include <linux/usb.h> |
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| 19 | |||
| 20 | #ifdef CONFIG_USB_SERIAL_DEBUG |
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| 21 | static int debug = 1; |
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| 22 | #else |
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| 23 | static int debug; |
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| 24 | #endif |
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| 25 | |||
| 26 | #include "usb-serial.h" |
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| 27 | |||
| 28 | static int usb_serial_device_match (struct device *dev, struct device_driver *drv) |
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| 29 | { |
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| 30 | struct usb_serial_device_type *driver; |
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| 31 | const struct usb_serial_port *port; |
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| 32 | |||
| 33 | /* |
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| 34 | * drivers are already assigned to ports in serial_probe so it's |
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| 35 | * a simple check here. |
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| 36 | */ |
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| 37 | port = to_usb_serial_port(dev); |
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| 38 | if (!port) |
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| 39 | return 0; |
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| 40 | |||
| 41 | driver = to_usb_serial_driver(drv); |
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| 42 | |||
| 43 | if (driver == port->serial->type) |
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| 44 | return 1; |
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| 45 | |||
| 46 | return 0; |
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| 47 | } |
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| 48 | |||
| 49 | struct bus_type usb_serial_bus_type = { |
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| 50 | .name = "usb-serial", |
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| 51 | .match = usb_serial_device_match, |
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| 52 | }; |
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| 53 | |||
| 54 | static int usb_serial_device_probe (struct device *dev) |
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| 55 | { |
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| 56 | struct usb_serial_device_type *driver; |
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| 57 | struct usb_serial_port *port; |
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| 58 | int retval = 0; |
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| 59 | int minor; |
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| 60 | |||
| 61 | port = to_usb_serial_port(dev); |
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| 62 | if (!port) { |
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| 63 | retval = -ENODEV; |
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| 64 | goto exit; |
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| 65 | } |
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| 66 | |||
| 67 | driver = port->serial->type; |
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| 68 | if (driver->port_probe) { |
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| 69 | if (!try_module_get(driver->owner)) { |
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| 70 | dev_err(dev, "module get failed, exiting\n"); |
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| 71 | retval = -EIO; |
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| 72 | goto exit; |
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| 73 | } |
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| 74 | retval = driver->port_probe (port); |
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| 75 | module_put(driver->owner); |
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| 76 | if (retval) |
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| 77 | goto exit; |
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| 78 | } |
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| 79 | |||
| 80 | minor = port->number; |
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| 81 | tty_register_device (usb_serial_tty_driver, minor, dev); |
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| 82 | dev_info(&port->serial->dev->dev, |
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| 83 | "%s converter now attached to ttyUSB%d (or usb/tts/%d for devfs)\n", |
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| 84 | driver->name, minor, minor); |
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| 85 | |||
| 86 | exit: |
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| 87 | return retval; |
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| 88 | } |
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| 89 | |||
| 90 | static int usb_serial_device_remove (struct device *dev) |
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| 91 | { |
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| 92 | struct usb_serial_device_type *driver; |
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| 93 | struct usb_serial_port *port; |
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| 94 | int retval = 0; |
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| 95 | int minor; |
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| 96 | |||
| 97 | port = to_usb_serial_port(dev); |
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| 98 | if (!port) { |
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| 99 | return -ENODEV; |
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| 100 | } |
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| 101 | |||
| 102 | driver = port->serial->type; |
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| 103 | if (driver->port_remove) { |
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| 104 | if (!try_module_get(driver->owner)) { |
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| 105 | dev_err(dev, "module get failed, exiting\n"); |
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| 106 | retval = -EIO; |
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| 107 | goto exit; |
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| 108 | } |
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| 109 | retval = driver->port_remove (port); |
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| 110 | module_put(driver->owner); |
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| 111 | } |
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| 112 | exit: |
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| 113 | minor = port->number; |
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| 114 | tty_unregister_device (usb_serial_tty_driver, minor); |
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| 115 | dev_info(dev, "%s converter now disconnected from ttyUSB%d\n", |
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| 116 | driver->name, minor); |
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| 117 | |||
| 118 | return retval; |
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| 119 | } |
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| 120 | |||
| 121 | int usb_serial_bus_register(struct usb_serial_device_type *device) |
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| 122 | { |
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| 123 | int retval; |
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| 124 | |||
| 125 | if (device->short_name) |
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| 126 | device->driver.name = (char *)device->short_name; |
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| 127 | else |
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| 128 | device->driver.name = (char *)device->name; |
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| 129 | device->driver.bus = &usb_serial_bus_type; |
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| 130 | device->driver.probe = usb_serial_device_probe; |
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| 131 | device->driver.remove = usb_serial_device_remove; |
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| 132 | |||
| 133 | retval = driver_register(&device->driver); |
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| 134 | |||
| 135 | return retval; |
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| 136 | } |
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| 137 | |||
| 138 | void usb_serial_bus_deregister(struct usb_serial_device_type *device) |
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| 139 | { |
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| 140 | driver_unregister (&device->driver); |
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| 141 | } |
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| 142 |