diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/gadget/legacy/printer.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/drivers/usb/gadget/legacy/printer.c b/drivers/usb/gadget/legacy/printer.c new file mode 100644 index 000000000..ed762ba9b --- /dev/null +++ b/drivers/usb/gadget/legacy/printer.c @@ -0,0 +1,226 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * printer.c -- Printer gadget driver + * + * Copyright (C) 2003-2005 David Brownell + * Copyright (C) 2006 Craig W. Nadler + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <asm/byteorder.h> + +#include <linux/usb/ch9.h> +#include <linux/usb/composite.h> +#include <linux/usb/gadget.h> +#include <linux/usb/g_printer.h> + +USB_GADGET_COMPOSITE_OPTIONS(); + +#define DRIVER_DESC "Printer Gadget" +#define DRIVER_VERSION "2015 FEB 17" + +static const char shortname [] = "printer"; + +#include "u_printer.h" + +/*-------------------------------------------------------------------------*/ + +/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! + * Instead: allocate your own, using normal USB-IF procedures. + */ + +/* Thanks to NetChip Technologies for donating this product ID. + */ +#define PRINTER_VENDOR_NUM 0x0525 /* NetChip */ +#define PRINTER_PRODUCT_NUM 0xa4a8 /* Linux-USB Printer Gadget */ + +/* Some systems will want different product identifiers published in the + * device descriptor, either numbers or strings or both. These string + * parameters are in UTF-8 (superset of ASCII's 7 bit characters). + */ + +module_param_named(iSerialNum, coverwrite.serial_number, charp, S_IRUGO); +MODULE_PARM_DESC(iSerialNum, "1"); + +static char *iPNPstring; +module_param(iPNPstring, charp, S_IRUGO); +MODULE_PARM_DESC(iPNPstring, "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;"); + +/* Number of requests to allocate per endpoint, not used for ep0. */ +static unsigned qlen = 10; +module_param(qlen, uint, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(qlen, "The number of 8k buffers to use per endpoint"); + +#define QLEN qlen + +static struct usb_function_instance *fi_printer; +static struct usb_function *f_printer; + +/*-------------------------------------------------------------------------*/ + +/* + * DESCRIPTORS ... most are static, but strings and (full) configuration + * descriptors are built on demand. + */ + +static struct usb_device_descriptor device_desc = { + .bLength = sizeof device_desc, + .bDescriptorType = USB_DT_DEVICE, + /* .bcdUSB = DYNAMIC */ + .bDeviceClass = USB_CLASS_PER_INTERFACE, + .bDeviceSubClass = 0, + .bDeviceProtocol = 0, + .idVendor = cpu_to_le16(PRINTER_VENDOR_NUM), + .idProduct = cpu_to_le16(PRINTER_PRODUCT_NUM), + .bNumConfigurations = 1 +}; + +static const struct usb_descriptor_header *otg_desc[2]; + +/*-------------------------------------------------------------------------*/ + +/* descriptors that are built on-demand */ + +static char product_desc [40] = DRIVER_DESC; +static char serial_num [40] = "1"; +static char *pnp_string = + "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;"; + +/* static strings, in UTF-8 */ +static struct usb_string strings [] = { + [USB_GADGET_MANUFACTURER_IDX].s = "", + [USB_GADGET_PRODUCT_IDX].s = product_desc, + [USB_GADGET_SERIAL_IDX].s = serial_num, + { } /* end of list */ +}; + +static struct usb_gadget_strings stringtab_dev = { + .language = 0x0409, /* en-us */ + .strings = strings, +}; + +static struct usb_gadget_strings *dev_strings[] = { + &stringtab_dev, + NULL, +}; + +static struct usb_configuration printer_cfg_driver = { + .label = "printer", + .bConfigurationValue = 1, + .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER, +}; + +static int printer_do_config(struct usb_configuration *c) +{ + struct usb_gadget *gadget = c->cdev->gadget; + int status = 0; + + usb_ep_autoconfig_reset(gadget); + + usb_gadget_set_selfpowered(gadget); + + if (gadget_is_otg(gadget)) { + printer_cfg_driver.descriptors = otg_desc; + printer_cfg_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP; + } + + f_printer = usb_get_function(fi_printer); + if (IS_ERR(f_printer)) + return PTR_ERR(f_printer); + + status = usb_add_function(c, f_printer); + if (status < 0) + usb_put_function(f_printer); + + return status; +} + +static int printer_bind(struct usb_composite_dev *cdev) +{ + struct f_printer_opts *opts; + int ret; + + fi_printer = usb_get_function_instance("printer"); + if (IS_ERR(fi_printer)) + return PTR_ERR(fi_printer); + + opts = container_of(fi_printer, struct f_printer_opts, func_inst); + opts->minor = 0; + opts->q_len = QLEN; + if (iPNPstring) { + opts->pnp_string = kstrdup(iPNPstring, GFP_KERNEL); + if (!opts->pnp_string) { + ret = -ENOMEM; + goto fail_put_func_inst; + } + opts->pnp_string_allocated = true; + /* + * we don't free this memory in case of error + * as printer cleanup func will do this for us + */ + } else { + opts->pnp_string = pnp_string; + } + + ret = usb_string_ids_tab(cdev, strings); + if (ret < 0) + goto fail_put_func_inst; + + device_desc.iManufacturer = strings[USB_GADGET_MANUFACTURER_IDX].id; + device_desc.iProduct = strings[USB_GADGET_PRODUCT_IDX].id; + device_desc.iSerialNumber = strings[USB_GADGET_SERIAL_IDX].id; + + if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) { + struct usb_descriptor_header *usb_desc; + + usb_desc = usb_otg_descriptor_alloc(cdev->gadget); + if (!usb_desc) { + ret = -ENOMEM; + goto fail_put_func_inst; + } + usb_otg_descriptor_init(cdev->gadget, usb_desc); + otg_desc[0] = usb_desc; + otg_desc[1] = NULL; + } + + ret = usb_add_config(cdev, &printer_cfg_driver, printer_do_config); + if (ret) + goto fail_free_otg_desc; + + usb_composite_overwrite_options(cdev, &coverwrite); + return ret; + +fail_free_otg_desc: + kfree(otg_desc[0]); + otg_desc[0] = NULL; +fail_put_func_inst: + usb_put_function_instance(fi_printer); + return ret; +} + +static int printer_unbind(struct usb_composite_dev *cdev) +{ + usb_put_function(f_printer); + usb_put_function_instance(fi_printer); + + kfree(otg_desc[0]); + otg_desc[0] = NULL; + + return 0; +} + +static struct usb_composite_driver printer_driver = { + .name = shortname, + .dev = &device_desc, + .strings = dev_strings, + .max_speed = USB_SPEED_SUPER, + .bind = printer_bind, + .unbind = printer_unbind, +}; + +module_usb_composite_driver(printer_driver); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_AUTHOR("Craig Nadler"); +MODULE_LICENSE("GPL"); |