linux/drivers/usb/gadget/legacy/printer.c
Krzysztof Opasiak fdc01cc286 usb: gadget: printer: Remove pnp_string static buffer
pnp string is usually much shorter than 1k so let's stop wasting 1k of
memory for its buffer and make it dynamically alocated.
This also removes 1k len limitation for pnp_string and
adds a new line after string content if required.

Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2017-01-24 11:04:08 +02:00

231 lines
6.0 KiB
C

/*
* printer.c -- Printer gadget driver
*
* Copyright (C) 2003-2005 David Brownell
* Copyright (C) 2006 Craig W. Nadler
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#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";
static const char driver_desc [] = DRIVER_DESC;
#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);
#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");