drivers/usb/gadget/legacy/printer.c

   1 /*
   2  * printer.c -- Printer gadget driver
   3  *
   4  * Copyright (C) 2003-2005 David Brownell
   5  * Copyright (C) 2006 Craig W. Nadler
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <asm/byteorder.h>
  16
  17 #include <linux/usb/ch9.h>
  18 #include <linux/usb/composite.h>
  19 #include <linux/usb/gadget.h>
  20 #include <linux/usb/g_printer.h>
  21
  22 USB_GADGET_COMPOSITE_OPTIONS();
  23
  24 #define DRIVER_DESC             "Printer Gadget"
  25 #define DRIVER_VERSION          "2015 FEB 17"
  26
  27 static const char shortname [] = "printer";
  28 static const char driver_desc [] = DRIVER_DESC;
  29
  30 #include "u_printer.h"
  31
  32 /*-------------------------------------------------------------------------*/
  33
  34 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
  35  * Instead:  allocate your own, using normal USB-IF procedures.
  36  */
  37
  38 /* Thanks to NetChip Technologies for donating this product ID.
  39  */
  40 #define PRINTER_VENDOR_NUM      0x0525          /* NetChip */
  41 #define PRINTER_PRODUCT_NUM     0xa4a8          /* Linux-USB Printer Gadget */
  42
  43 /* Some systems will want different product identifiers published in the
  44  * device descriptor, either numbers or strings or both.  These string
  45  * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
  46  */
  47
  48 module_param_named(iSerialNum, coverwrite.serial_number, charp, S_IRUGO);
  49 MODULE_PARM_DESC(iSerialNum, "1");
  50
  51 static char *iPNPstring;
  52 module_param(iPNPstring, charp, S_IRUGO);
  53 MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;");
  54
  55 /* Number of requests to allocate per endpoint, not used for ep0. */
  56 static unsigned qlen = 10;
  57 module_param(qlen, uint, S_IRUGO|S_IWUSR);
  58
  59 #define QLEN    qlen
  60
  61 static struct usb_function_instance *fi_printer;
  62 static struct usb_function *f_printer;
  63
  64 /*-------------------------------------------------------------------------*/
  65
  66 /*
  67  * DESCRIPTORS ... most are static, but strings and (full) configuration
  68  * descriptors are built on demand.
  69  */
  70
  71 static struct usb_device_descriptor device_desc = {
  72         .bLength =              sizeof device_desc,
  73         .bDescriptorType =      USB_DT_DEVICE,
  74         /* .bcdUSB = DYNAMIC */
  75         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
  76         .bDeviceSubClass =      0,
  77         .bDeviceProtocol =      0,
  78         .idVendor =             cpu_to_le16(PRINTER_VENDOR_NUM),
  79         .idProduct =            cpu_to_le16(PRINTER_PRODUCT_NUM),
  80         .bNumConfigurations =   1
  81 };
  82
  83 static const struct usb_descriptor_header *otg_desc[2];
  84
  85 /*-------------------------------------------------------------------------*/
  86
  87 /* descriptors that are built on-demand */
  88
  89 static char                             product_desc [40] = DRIVER_DESC;
  90 static char                             serial_num [40] = "1";
  91 static char                             *pnp_string =
  92         "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;";
  93
  94 /* static strings, in UTF-8 */
  95 static struct usb_string                strings [] = {
  96         [USB_GADGET_MANUFACTURER_IDX].s = "",
  97         [USB_GADGET_PRODUCT_IDX].s = product_desc,
  98         [USB_GADGET_SERIAL_IDX].s =     serial_num,
  99         {  }            /* end of list */
 100 };
 101
 102 static struct usb_gadget_strings        stringtab_dev = {
 103         .language       = 0x0409,       /* en-us */
 104         .strings        = strings,
 105 };
 106
 107 static struct usb_gadget_strings *dev_strings[] = {
 108         &stringtab_dev,
 109         NULL,
 110 };
 111
 112 static struct usb_configuration printer_cfg_driver = {
 113         .label                  = "printer",
 114         .bConfigurationValue    = 1,
 115         .bmAttributes           = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 116 };
 117
 118 static int printer_do_config(struct usb_configuration *c)
 119 {
 120         struct usb_gadget       *gadget = c->cdev->gadget;
 121         int                     status = 0;
 122
 123         usb_ep_autoconfig_reset(gadget);
 124
 125         usb_gadget_set_selfpowered(gadget);
 126
 127         if (gadget_is_otg(gadget)) {
 128                 printer_cfg_driver.descriptors = otg_desc;
 129                 printer_cfg_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 130         }
 131
 132         f_printer = usb_get_function(fi_printer);
 133         if (IS_ERR(f_printer))
 134                 return PTR_ERR(f_printer);
 135
 136         status = usb_add_function(c, f_printer);
 137         if (status < 0)
 138                 usb_put_function(f_printer);
 139
 140         return status;
 141 }
 142
 143 static int printer_bind(struct usb_composite_dev *cdev)
 144 {
 145         struct f_printer_opts *opts;
 146         int ret;
 147
 148         fi_printer = usb_get_function_instance("printer");
 149         if (IS_ERR(fi_printer))
 150                 return PTR_ERR(fi_printer);
 151
 152         opts = container_of(fi_printer, struct f_printer_opts, func_inst);
 153         opts->minor = 0;
 154         opts->q_len = QLEN;
 155         if (iPNPstring) {
 156                 opts->pnp_string = kstrdup(iPNPstring, GFP_KERNEL);
 157                 if (!opts->pnp_string) {
 158                         ret = -ENOMEM;
 159                         goto fail_put_func_inst;
 160                 }
 161                 opts->pnp_string_allocated = true;
 162                 /*
 163                  * we don't free this memory in case of error
 164                  * as printer cleanup func will do this for us
 165                  */
 166         } else {
 167                 opts->pnp_string = pnp_string;
 168         }
 169
 170         ret = usb_string_ids_tab(cdev, strings);
 171         if (ret < 0)
 172                 goto fail_put_func_inst;
 173
 174         device_desc.iManufacturer = strings[USB_GADGET_MANUFACTURER_IDX].id;
 175         device_desc.iProduct = strings[USB_GADGET_PRODUCT_IDX].id;
 176         device_desc.iSerialNumber = strings[USB_GADGET_SERIAL_IDX].id;
 177
 178         if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
 179                 struct usb_descriptor_header *usb_desc;
 180
 181                 usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
 182                 if (!usb_desc) {
 183                         ret = -ENOMEM;
 184                         goto fail_put_func_inst;
 185                 }
 186                 usb_otg_descriptor_init(cdev->gadget, usb_desc);
 187                 otg_desc[0] = usb_desc;
 188                 otg_desc[1] = NULL;
 189         }
 190
 191         ret = usb_add_config(cdev, &printer_cfg_driver, printer_do_config);
 192         if (ret)
 193                 goto fail_free_otg_desc;
 194
 195         usb_composite_overwrite_options(cdev, &coverwrite);
 196         return ret;
 197
 198 fail_free_otg_desc:
 199         kfree(otg_desc[0]);
 200         otg_desc[0] = NULL;
 201 fail_put_func_inst:
 202         usb_put_function_instance(fi_printer);
 203         return ret;
 204 }
 205
 206 static int printer_unbind(struct usb_composite_dev *cdev)
 207 {
 208         usb_put_function(f_printer);
 209         usb_put_function_instance(fi_printer);
 210
 211         kfree(otg_desc[0]);
 212         otg_desc[0] = NULL;
 213
 214         return 0;
 215 }
 216
 217 static struct usb_composite_driver printer_driver = {
 218         .name           = shortname,
 219         .dev            = &device_desc,
 220         .strings        = dev_strings,
 221         .max_speed      = USB_SPEED_SUPER,
 222         .bind           = printer_bind,
 223         .unbind         = printer_unbind,
 224 };
 225
 226 module_usb_composite_driver(printer_driver);
 227
 228 MODULE_DESCRIPTION(DRIVER_DESC);
 229 MODULE_AUTHOR("Craig Nadler");
 230 MODULE_LICENSE("GPL");