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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 846 | giacomo | 1 | /* |
| 2 | * USB Serial Converter Generic functions |
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| 3 | * |
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| 4 | * Copyright (C) 1999 - 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 | */ |
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| 11 | |||
| 12 | #include <linuxcomp.h> |
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| 13 | |||
| 14 | #include <linux/config.h> |
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| 15 | #include <linux/kernel.h> |
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| 16 | #include <linux/errno.h> |
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| 17 | #include <linux/slab.h> |
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| 18 | #include <linux/tty.h> |
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| 19 | #include <linux/tty_flip.h> |
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| 20 | #include <linux/module.h> |
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| 21 | #include <linux/usb.h> |
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| 22 | #include <asm/uaccess.h> |
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| 23 | |||
| 24 | #ifdef CONFIG_USB_SERIAL_DEBUG |
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| 25 | static int debug = 1; |
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| 26 | #else |
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| 27 | static int debug; |
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| 28 | #endif |
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| 29 | |||
| 30 | #include "usb-serial.h" |
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| 31 | |||
| 32 | |||
| 33 | #ifdef CONFIG_USB_SERIAL_GENERIC |
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| 34 | static __u16 vendor = 0x05f9; |
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| 35 | static __u16 product = 0xffff; |
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| 36 | |||
| 37 | MODULE_PARM(vendor, "h"); |
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| 38 | MODULE_PARM_DESC(vendor, "User specified USB idVendor"); |
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| 39 | |||
| 40 | MODULE_PARM(product, "h"); |
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| 41 | MODULE_PARM_DESC(product, "User specified USB idProduct"); |
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| 42 | |||
| 43 | static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ |
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| 44 | |||
| 45 | /* All of the device info needed for the Generic Serial Converter */ |
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| 46 | struct usb_serial_device_type usb_serial_generic_device = { |
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| 47 | .owner = THIS_MODULE, |
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| 48 | .name = "Generic", |
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| 49 | .short_name = "generic", |
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| 50 | .id_table = generic_device_ids, |
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| 51 | .num_interrupt_in = NUM_DONT_CARE, |
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| 52 | .num_bulk_in = NUM_DONT_CARE, |
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| 53 | .num_bulk_out = NUM_DONT_CARE, |
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| 54 | .num_ports = 1, |
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| 55 | .shutdown = usb_serial_generic_shutdown, |
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| 56 | }; |
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| 57 | #endif |
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| 58 | |||
| 59 | int usb_serial_generic_register (int _debug) |
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| 60 | { |
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| 61 | int retval = 0; |
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| 62 | |||
| 63 | debug = _debug; |
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| 64 | #ifdef CONFIG_USB_SERIAL_GENERIC |
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| 65 | generic_device_ids[0].idVendor = vendor; |
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| 66 | generic_device_ids[0].idProduct = product; |
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| 67 | generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; |
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| 68 | |||
| 69 | /* register our generic driver with ourselves */ |
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| 70 | retval = usb_serial_register (&usb_serial_generic_device); |
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| 71 | #endif |
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| 72 | return retval; |
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| 73 | } |
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| 74 | |||
| 75 | void usb_serial_generic_deregister (void) |
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| 76 | { |
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| 77 | #ifdef CONFIG_USB_SERIAL_GENERIC |
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| 78 | /* remove our generic driver */ |
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| 79 | usb_serial_deregister (&usb_serial_generic_device); |
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| 80 | #endif |
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| 81 | } |
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| 82 | |||
| 83 | int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp) |
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| 84 | { |
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| 85 | struct usb_serial *serial = port->serial; |
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| 86 | int result = 0; |
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| 87 | |||
| 88 | if (port_paranoia_check (port, __FUNCTION__)) |
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| 89 | return -ENODEV; |
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| 90 | |||
| 91 | dbg("%s - port %d", __FUNCTION__, port->number); |
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| 92 | |||
| 93 | /* force low_latency on so that our tty_push actually forces the data through, |
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| 94 | otherwise it is scheduled, and with high data rates (like with OHCI) data |
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| 95 | can get lost. */ |
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| 96 | if (port->tty) |
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| 97 | port->tty->low_latency = 1; |
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| 98 | |||
| 99 | /* if we have a bulk interrupt, start reading from it */ |
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| 100 | if (serial->num_bulk_in) { |
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| 101 | /* Start reading from the device */ |
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| 102 | usb_fill_bulk_urb (port->read_urb, serial->dev, |
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| 103 | usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress), |
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| 104 | port->read_urb->transfer_buffer, |
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| 105 | port->read_urb->transfer_buffer_length, |
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| 106 | ((serial->type->read_bulk_callback) ? |
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| 107 | serial->type->read_bulk_callback : |
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| 108 | usb_serial_generic_read_bulk_callback), |
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| 109 | port); |
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| 110 | result = usb_submit_urb(port->read_urb, GFP_KERNEL); |
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| 111 | if (result) |
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| 112 | dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); |
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| 113 | } |
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| 114 | |||
| 115 | return result; |
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| 116 | } |
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| 117 | |||
| 118 | static void generic_cleanup (struct usb_serial_port *port) |
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| 119 | { |
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| 120 | struct usb_serial *serial = port->serial; |
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| 121 | |||
| 122 | dbg("%s - port %d", __FUNCTION__, port->number); |
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| 123 | |||
| 124 | if (serial->dev) { |
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| 125 | /* shutdown any bulk reads that might be going on */ |
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| 126 | if (serial->num_bulk_out) |
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| 127 | usb_unlink_urb (port->write_urb); |
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| 128 | if (serial->num_bulk_in) |
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| 129 | usb_unlink_urb (port->read_urb); |
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| 130 | } |
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| 131 | } |
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| 132 | |||
| 133 | void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp) |
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| 134 | { |
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| 135 | dbg("%s - port %d", __FUNCTION__, port->number); |
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| 136 | generic_cleanup (port); |
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| 137 | } |
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| 138 | |||
| 139 | int usb_serial_generic_write (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count) |
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| 140 | { |
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| 141 | struct usb_serial *serial = port->serial; |
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| 142 | int result; |
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| 143 | |||
| 144 | dbg("%s - port %d", __FUNCTION__, port->number); |
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| 145 | |||
| 146 | if (count == 0) { |
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| 147 | dbg("%s - write request of 0 bytes", __FUNCTION__); |
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| 148 | return (0); |
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| 149 | } |
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| 150 | |||
| 151 | /* only do something if we have a bulk out endpoint */ |
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| 152 | if (serial->num_bulk_out) { |
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| 153 | if (port->write_urb->status == -EINPROGRESS) { |
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| 154 | dbg("%s - already writing", __FUNCTION__); |
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| 155 | return (0); |
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| 156 | } |
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| 157 | |||
| 158 | count = (count > port->bulk_out_size) ? port->bulk_out_size : count; |
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| 159 | |||
| 160 | if (from_user) { |
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| 161 | if (copy_from_user(port->write_urb->transfer_buffer, buf, count)) |
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| 162 | return -EFAULT; |
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| 163 | } |
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| 164 | else { |
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| 165 | memcpy (port->write_urb->transfer_buffer, buf, count); |
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| 166 | } |
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| 167 | |||
| 168 | usb_serial_debug_data (__FILE__, __FUNCTION__, count, port->write_urb->transfer_buffer); |
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| 169 | |||
| 170 | /* set up our urb */ |
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| 171 | usb_fill_bulk_urb (port->write_urb, serial->dev, |
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| 172 | usb_sndbulkpipe (serial->dev, |
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| 173 | port->bulk_out_endpointAddress), |
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| 174 | port->write_urb->transfer_buffer, count, |
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| 175 | ((serial->type->write_bulk_callback) ? |
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| 176 | serial->type->write_bulk_callback : |
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| 177 | usb_serial_generic_write_bulk_callback), port); |
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| 178 | |||
| 179 | /* send the data out the bulk port */ |
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| 180 | result = usb_submit_urb(port->write_urb, GFP_ATOMIC); |
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| 181 | if (result) |
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| 182 | dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result); |
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| 183 | else |
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| 184 | result = count; |
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| 185 | |||
| 186 | return result; |
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| 187 | } |
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| 188 | |||
| 189 | /* no bulk out, so return 0 bytes written */ |
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| 190 | return (0); |
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| 191 | } |
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| 192 | |||
| 193 | int usb_serial_generic_write_room (struct usb_serial_port *port) |
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| 194 | { |
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| 195 | struct usb_serial *serial = port->serial; |
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| 196 | int room = 0; |
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| 197 | |||
| 198 | dbg("%s - port %d", __FUNCTION__, port->number); |
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| 199 | |||
| 200 | if (serial->num_bulk_out) { |
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| 201 | if (port->write_urb->status != -EINPROGRESS) |
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| 202 | room = port->bulk_out_size; |
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| 203 | } |
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| 204 | |||
| 205 | dbg("%s - returns %d", __FUNCTION__, room); |
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| 206 | return (room); |
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| 207 | } |
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| 208 | |||
| 209 | int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port) |
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| 210 | { |
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| 211 | struct usb_serial *serial = port->serial; |
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| 212 | int chars = 0; |
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| 213 | |||
| 214 | dbg("%s - port %d", __FUNCTION__, port->number); |
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| 215 | |||
| 216 | if (serial->num_bulk_out) { |
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| 217 | if (port->write_urb->status == -EINPROGRESS) |
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| 218 | chars = port->write_urb->transfer_buffer_length; |
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| 219 | } |
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| 220 | |||
| 221 | dbg("%s - returns %d", __FUNCTION__, chars); |
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| 222 | return (chars); |
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| 223 | } |
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| 224 | |||
| 225 | void usb_serial_generic_read_bulk_callback (struct urb *urb, struct pt_regs *regs) |
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| 226 | { |
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| 227 | struct usb_serial_port *port = (struct usb_serial_port *)urb->context; |
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| 228 | struct usb_serial *serial = get_usb_serial (port, __FUNCTION__); |
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| 229 | struct tty_struct *tty; |
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| 230 | unsigned char *data = urb->transfer_buffer; |
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| 231 | int i; |
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| 232 | int result; |
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| 233 | |||
| 234 | dbg("%s - port %d", __FUNCTION__, port->number); |
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| 235 | |||
| 236 | if (!serial) { |
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| 237 | dbg("%s - bad serial pointer, exiting", __FUNCTION__); |
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| 238 | return; |
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| 239 | } |
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| 240 | |||
| 241 | if (urb->status) { |
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| 242 | dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status); |
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| 243 | return; |
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| 244 | } |
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| 245 | |||
| 246 | usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data); |
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| 247 | |||
| 248 | tty = port->tty; |
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| 249 | if (tty && urb->actual_length) { |
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| 250 | for (i = 0; i < urb->actual_length ; ++i) { |
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| 251 | /* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */ |
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| 252 | if(tty->flip.count >= TTY_FLIPBUF_SIZE) { |
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| 253 | tty_flip_buffer_push(tty); |
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| 254 | } |
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| 255 | /* this doesn't actually push the data through unless tty->low_latency is set */ |
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| 256 | tty_insert_flip_char(tty, data[i], 0); |
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| 257 | } |
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| 258 | tty_flip_buffer_push(tty); |
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| 259 | } |
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| 260 | |||
| 261 | /* Continue trying to always read */ |
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| 262 | usb_fill_bulk_urb (port->read_urb, serial->dev, |
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| 263 | usb_rcvbulkpipe (serial->dev, |
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| 264 | port->bulk_in_endpointAddress), |
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| 265 | port->read_urb->transfer_buffer, |
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| 266 | port->read_urb->transfer_buffer_length, |
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| 267 | ((serial->type->read_bulk_callback) ? |
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| 268 | serial->type->read_bulk_callback : |
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| 269 | usb_serial_generic_read_bulk_callback), port); |
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| 270 | result = usb_submit_urb(port->read_urb, GFP_ATOMIC); |
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| 271 | if (result) |
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| 272 | dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); |
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| 273 | } |
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| 274 | |||
| 275 | void usb_serial_generic_write_bulk_callback (struct urb *urb, struct pt_regs *regs) |
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| 276 | { |
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| 277 | struct usb_serial_port *port = (struct usb_serial_port *)urb->context; |
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| 278 | struct usb_serial *serial = get_usb_serial (port, __FUNCTION__); |
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| 279 | |||
| 280 | dbg("%s - port %d", __FUNCTION__, port->number); |
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| 281 | |||
| 282 | if (!serial) { |
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| 283 | dbg("%s - bad serial pointer, exiting", __FUNCTION__); |
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| 284 | return; |
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| 285 | } |
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| 286 | |||
| 287 | if (urb->status) { |
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| 288 | dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status); |
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| 289 | return; |
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| 290 | } |
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| 291 | |||
| 292 | usb_serial_port_softint((void *)port); |
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| 293 | |||
| 294 | schedule_work(&port->work); |
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| 295 | } |
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| 296 | |||
| 297 | void usb_serial_generic_shutdown (struct usb_serial *serial) |
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| 298 | { |
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| 299 | int i; |
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| 300 | |||
| 301 | dbg("%s", __FUNCTION__); |
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| 302 | |||
| 303 | /* stop reads and writes on all ports */ |
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| 304 | for (i=0; i < serial->num_ports; ++i) { |
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| 305 | generic_cleanup(serial->port[i]); |
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| 306 | } |
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| 307 | } |
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| 308 |