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path: root/drivers/usb/gadget/serial.c
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Diffstat (limited to 'drivers/usb/gadget/serial.c')
-rw-r--r--drivers/usb/gadget/serial.c2436
1 files changed, 2436 insertions, 0 deletions
diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
new file mode 100644
index 000000000000..2af3f785d5a1
--- /dev/null
+++ b/drivers/usb/gadget/serial.c
@@ -0,0 +1,2436 @@
+/*
+ * g_serial.c -- USB gadget serial driver
+ *
+ * Copyright 2003 (C) Al Borchers (alborchers@steinerpoint.com)
+ *
+ * This code is based in part on the Gadget Zero driver, which
+ * is Copyright (C) 2003 by David Brownell, all rights reserved.
+ *
+ * This code also borrows from usbserial.c, which is
+ * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
+ * Copyright (C) 2000 Al Borchers (alborchers@steinerpoint.com)
+ *
+ * This software is distributed under the terms of the GNU General
+ * Public License ("GPL") as published by the Free Software Foundation,
+ * either version 2 of that License or (at your option) any later version.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/utsname.h>
+#include <linux/wait.h>
+#include <linux/proc_fs.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+#include <asm/uaccess.h>
+
+#include <linux/usb_ch9.h>
+#include <linux/usb_cdc.h>
+#include <linux/usb_gadget.h>
+
+#include "gadget_chips.h"
+
+
+/* Wait Cond */
+
+#define __wait_cond_interruptible(wq, condition, lock, flags, ret) \
+do { \
+ wait_queue_t __wait; \
+ init_waitqueue_entry(&__wait, current); \
+ \
+ add_wait_queue(&wq, &__wait); \
+ for (;;) { \
+ set_current_state(TASK_INTERRUPTIBLE); \
+ if (condition) \
+ break; \
+ if (!signal_pending(current)) { \
+ spin_unlock_irqrestore(lock, flags); \
+ schedule(); \
+ spin_lock_irqsave(lock, flags); \
+ continue; \
+ } \
+ ret = -ERESTARTSYS; \
+ break; \
+ } \
+ current->state = TASK_RUNNING; \
+ remove_wait_queue(&wq, &__wait); \
+} while (0)
+
+#define wait_cond_interruptible(wq, condition, lock, flags) \
+({ \
+ int __ret = 0; \
+ if (!(condition)) \
+ __wait_cond_interruptible(wq, condition, lock, flags, \
+ __ret); \
+ __ret; \
+})
+
+#define __wait_cond_interruptible_timeout(wq, condition, lock, flags, \
+ timeout, ret) \
+do { \
+ signed long __timeout = timeout; \
+ wait_queue_t __wait; \
+ init_waitqueue_entry(&__wait, current); \
+ \
+ add_wait_queue(&wq, &__wait); \
+ for (;;) { \
+ set_current_state(TASK_INTERRUPTIBLE); \
+ if (__timeout == 0) \
+ break; \
+ if (condition) \
+ break; \
+ if (!signal_pending(current)) { \
+ spin_unlock_irqrestore(lock, flags); \
+ __timeout = schedule_timeout(__timeout); \
+ spin_lock_irqsave(lock, flags); \
+ continue; \
+ } \
+ ret = -ERESTARTSYS; \
+ break; \
+ } \
+ current->state = TASK_RUNNING; \
+ remove_wait_queue(&wq, &__wait); \
+} while (0)
+
+#define wait_cond_interruptible_timeout(wq, condition, lock, flags, \
+ timeout) \
+({ \
+ int __ret = 0; \
+ if (!(condition)) \
+ __wait_cond_interruptible_timeout(wq, condition, lock, \
+ flags, timeout, __ret); \
+ __ret; \
+})
+
+
+/* Defines */
+
+#define GS_VERSION_STR "v2.0"
+#define GS_VERSION_NUM 0x0200
+
+#define GS_LONG_NAME "Gadget Serial"
+#define GS_SHORT_NAME "g_serial"
+
+#define GS_MAJOR 127
+#define GS_MINOR_START 0
+
+#define GS_NUM_PORTS 16
+
+#define GS_NUM_CONFIGS 1
+#define GS_NO_CONFIG_ID 0
+#define GS_BULK_CONFIG_ID 1
+#define GS_ACM_CONFIG_ID 2
+
+#define GS_MAX_NUM_INTERFACES 2
+#define GS_BULK_INTERFACE_ID 0
+#define GS_CONTROL_INTERFACE_ID 0
+#define GS_DATA_INTERFACE_ID 1
+
+#define GS_MAX_DESC_LEN 256
+
+#define GS_DEFAULT_READ_Q_SIZE 32
+#define GS_DEFAULT_WRITE_Q_SIZE 32
+
+#define GS_DEFAULT_WRITE_BUF_SIZE 8192
+#define GS_TMP_BUF_SIZE 8192
+
+#define GS_CLOSE_TIMEOUT 15
+
+#define GS_DEFAULT_USE_ACM 0
+
+#define GS_DEFAULT_DTE_RATE 9600
+#define GS_DEFAULT_DATA_BITS 8
+#define GS_DEFAULT_PARITY USB_CDC_NO_PARITY
+#define GS_DEFAULT_CHAR_FORMAT USB_CDC_1_STOP_BITS
+
+/* select highspeed/fullspeed, hiding highspeed if not configured */
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+#define GS_SPEED_SELECT(is_hs,hs,fs) ((is_hs) ? (hs) : (fs))
+#else
+#define GS_SPEED_SELECT(is_hs,hs,fs) (fs)
+#endif /* CONFIG_USB_GADGET_DUALSPEED */
+
+/* debug settings */
+#ifdef GS_DEBUG
+static int debug = 1;
+
+#define gs_debug(format, arg...) \
+ do { if (debug) printk(KERN_DEBUG format, ## arg); } while(0)
+#define gs_debug_level(level, format, arg...) \
+ do { if (debug>=level) printk(KERN_DEBUG format, ## arg); } while(0)
+
+#else
+
+#define gs_debug(format, arg...) \
+ do { } while(0)
+#define gs_debug_level(level, format, arg...) \
+ do { } while(0)
+
+#endif /* GS_DEBUG */
+
+/* Thanks to NetChip Technologies for donating this product ID.
+ *
+ * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
+ * Instead: allocate your own, using normal USB-IF procedures.
+ */
+#define GS_VENDOR_ID 0x0525 /* NetChip */
+#define GS_PRODUCT_ID 0xa4a6 /* Linux-USB Serial Gadget */
+#define GS_CDC_PRODUCT_ID 0xa4a7 /* ... as CDC-ACM */
+
+#define GS_LOG2_NOTIFY_INTERVAL 5 /* 1 << 5 == 32 msec */
+#define GS_NOTIFY_MAXPACKET 8
+
+
+/* Structures */
+
+struct gs_dev;
+
+/* circular buffer */
+struct gs_buf {
+ unsigned int buf_size;
+ char *buf_buf;
+ char *buf_get;
+ char *buf_put;
+};
+
+/* list of requests */
+struct gs_req_entry {
+ struct list_head re_entry;
+ struct usb_request *re_req;
+};
+
+/* the port structure holds info for each port, one for each minor number */
+struct gs_port {
+ struct gs_dev *port_dev; /* pointer to device struct */
+ struct tty_struct *port_tty; /* pointer to tty struct */
+ spinlock_t port_lock;
+ int port_num;
+ int port_open_count;
+ int port_in_use; /* open/close in progress */
+ wait_queue_head_t port_write_wait;/* waiting to write */
+ struct gs_buf *port_write_buf;
+ struct usb_cdc_line_coding port_line_coding;
+};
+
+/* the device structure holds info for the USB device */
+struct gs_dev {
+ struct usb_gadget *dev_gadget; /* gadget device pointer */
+ spinlock_t dev_lock; /* lock for set/reset config */
+ int dev_config; /* configuration number */
+ struct usb_ep *dev_notify_ep; /* address of notify endpoint */
+ struct usb_ep *dev_in_ep; /* address of in endpoint */
+ struct usb_ep *dev_out_ep; /* address of out endpoint */
+ struct usb_endpoint_descriptor /* desciptor of notify ep */
+ *dev_notify_ep_desc;
+ struct usb_endpoint_descriptor /* descriptor of in endpoint */
+ *dev_in_ep_desc;
+ struct usb_endpoint_descriptor /* descriptor of out endpoint */
+ *dev_out_ep_desc;
+ struct usb_request *dev_ctrl_req; /* control request */
+ struct list_head dev_req_list; /* list of write requests */
+ int dev_sched_port; /* round robin port scheduled */
+ struct gs_port *dev_port[GS_NUM_PORTS]; /* the ports */
+};
+
+
+/* Functions */
+
+/* module */
+static int __init gs_module_init(void);
+static void __exit gs_module_exit(void);
+
+/* tty driver */
+static int gs_open(struct tty_struct *tty, struct file *file);
+static void gs_close(struct tty_struct *tty, struct file *file);
+static int gs_write(struct tty_struct *tty,
+ const unsigned char *buf, int count);
+static void gs_put_char(struct tty_struct *tty, unsigned char ch);
+static void gs_flush_chars(struct tty_struct *tty);
+static int gs_write_room(struct tty_struct *tty);
+static int gs_chars_in_buffer(struct tty_struct *tty);
+static void gs_throttle(struct tty_struct * tty);
+static void gs_unthrottle(struct tty_struct * tty);
+static void gs_break(struct tty_struct *tty, int break_state);
+static int gs_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg);
+static void gs_set_termios(struct tty_struct *tty, struct termios *old);
+
+static int gs_send(struct gs_dev *dev);
+static int gs_send_packet(struct gs_dev *dev, char *packet,
+ unsigned int size);
+static int gs_recv_packet(struct gs_dev *dev, char *packet,
+ unsigned int size);
+static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
+static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
+
+/* gadget driver */
+static int gs_bind(struct usb_gadget *gadget);
+static void gs_unbind(struct usb_gadget *gadget);
+static int gs_setup(struct usb_gadget *gadget,
+ const struct usb_ctrlrequest *ctrl);
+static int gs_setup_standard(struct usb_gadget *gadget,
+ const struct usb_ctrlrequest *ctrl);
+static int gs_setup_class(struct usb_gadget *gadget,
+ const struct usb_ctrlrequest *ctrl);
+static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req);
+static void gs_disconnect(struct usb_gadget *gadget);
+static int gs_set_config(struct gs_dev *dev, unsigned config);
+static void gs_reset_config(struct gs_dev *dev);
+static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
+ u8 type, unsigned int index, int is_otg);
+
+static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
+ int kmalloc_flags);
+static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
+
+static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len,
+ int kmalloc_flags);
+static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req);
+
+static int gs_alloc_ports(struct gs_dev *dev, int kmalloc_flags);
+static void gs_free_ports(struct gs_dev *dev);
+
+/* circular buffer */
+static struct gs_buf *gs_buf_alloc(unsigned int size, int kmalloc_flags);
+static void gs_buf_free(struct gs_buf *gb);
+static void gs_buf_clear(struct gs_buf *gb);
+static unsigned int gs_buf_data_avail(struct gs_buf *gb);
+static unsigned int gs_buf_space_avail(struct gs_buf *gb);
+static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
+ unsigned int count);
+static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
+ unsigned int count);
+
+/* external functions */
+extern int net2280_set_fifo_mode(struct usb_gadget *gadget, int mode);
+
+
+/* Globals */
+
+static struct gs_dev *gs_device;
+
+static const char *EP_IN_NAME;
+static const char *EP_OUT_NAME;
+static const char *EP_NOTIFY_NAME;
+
+static struct semaphore gs_open_close_sem[GS_NUM_PORTS];
+
+static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
+static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
+
+static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
+
+static unsigned int use_acm = GS_DEFAULT_USE_ACM;
+
+
+/* tty driver struct */
+static struct tty_operations gs_tty_ops = {
+ .open = gs_open,
+ .close = gs_close,
+ .write = gs_write,
+ .put_char = gs_put_char,
+ .flush_chars = gs_flush_chars,
+ .write_room = gs_write_room,
+ .ioctl = gs_ioctl,
+ .set_termios = gs_set_termios,
+ .throttle = gs_throttle,
+ .unthrottle = gs_unthrottle,
+ .break_ctl = gs_break,
+ .chars_in_buffer = gs_chars_in_buffer,
+};
+static struct tty_driver *gs_tty_driver;
+
+/* gadget driver struct */
+static struct usb_gadget_driver gs_gadget_driver = {
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+ .speed = USB_SPEED_HIGH,
+#else
+ .speed = USB_SPEED_FULL,
+#endif /* CONFIG_USB_GADGET_DUALSPEED */
+ .function = GS_LONG_NAME,
+ .bind = gs_bind,
+ .unbind = gs_unbind,
+ .setup = gs_setup,
+ .disconnect = gs_disconnect,
+ .driver = {
+ .name = GS_SHORT_NAME,
+ /* .shutdown = ... */
+ /* .suspend = ... */
+ /* .resume = ... */
+ },
+};
+
+
+/* USB descriptors */
+
+#define GS_MANUFACTURER_STR_ID 1
+#define GS_PRODUCT_STR_ID 2
+#define GS_SERIAL_STR_ID 3
+#define GS_BULK_CONFIG_STR_ID 4
+#define GS_ACM_CONFIG_STR_ID 5
+#define GS_CONTROL_STR_ID 6
+#define GS_DATA_STR_ID 7
+
+/* static strings, in UTF-8 */
+static char manufacturer[50];
+static struct usb_string gs_strings[] = {
+ { GS_MANUFACTURER_STR_ID, manufacturer },
+ { GS_PRODUCT_STR_ID, GS_LONG_NAME },
+ { GS_SERIAL_STR_ID, "0" },
+ { GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" },
+ { GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" },
+ { GS_CONTROL_STR_ID, "Gadget Serial Control" },
+ { GS_DATA_STR_ID, "Gadget Serial Data" },
+ { } /* end of list */
+};
+
+static struct usb_gadget_strings gs_string_table = {
+ .language = 0x0409, /* en-us */
+ .strings = gs_strings,
+};
+
+static struct usb_device_descriptor gs_device_desc = {
+ .bLength = USB_DT_DEVICE_SIZE,
+ .bDescriptorType = USB_DT_DEVICE,
+ .bcdUSB = __constant_cpu_to_le16(0x0200),
+ .bDeviceSubClass = 0,
+ .bDeviceProtocol = 0,
+ .idVendor = __constant_cpu_to_le16(GS_VENDOR_ID),
+ .idProduct = __constant_cpu_to_le16(GS_PRODUCT_ID),
+ .iManufacturer = GS_MANUFACTURER_STR_ID,
+ .iProduct = GS_PRODUCT_STR_ID,
+ .iSerialNumber = GS_SERIAL_STR_ID,
+ .bNumConfigurations = GS_NUM_CONFIGS,
+};
+
+static struct usb_otg_descriptor gs_otg_descriptor = {
+ .bLength = sizeof(gs_otg_descriptor),
+ .bDescriptorType = USB_DT_OTG,
+ .bmAttributes = USB_OTG_SRP,
+};
+
+static struct usb_config_descriptor gs_bulk_config_desc = {
+ .bLength = USB_DT_CONFIG_SIZE,
+ .bDescriptorType = USB_DT_CONFIG,
+ /* .wTotalLength computed dynamically */
+ .bNumInterfaces = 1,
+ .bConfigurationValue = GS_BULK_CONFIG_ID,
+ .iConfiguration = GS_BULK_CONFIG_STR_ID,
+ .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
+ .bMaxPower = 1,
+};
+
+static struct usb_config_descriptor gs_acm_config_desc = {
+ .bLength = USB_DT_CONFIG_SIZE,
+ .bDescriptorType = USB_DT_CONFIG,
+ /* .wTotalLength computed dynamically */
+ .bNumInterfaces = 2,
+ .bConfigurationValue = GS_ACM_CONFIG_ID,
+ .iConfiguration = GS_ACM_CONFIG_STR_ID,
+ .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
+ .bMaxPower = 1,
+};
+
+static const struct usb_interface_descriptor gs_bulk_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = GS_BULK_INTERFACE_ID,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = USB_CLASS_CDC_DATA,
+ .bInterfaceSubClass = 0,
+ .bInterfaceProtocol = 0,
+ .iInterface = GS_DATA_STR_ID,
+};
+
+static const struct usb_interface_descriptor gs_control_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = GS_CONTROL_INTERFACE_ID,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_COMM,
+ .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
+ .bInterfaceProtocol = USB_CDC_ACM_PROTO_AT_V25TER,
+ .iInterface = GS_CONTROL_STR_ID,
+};
+
+static const struct usb_interface_descriptor gs_data_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = GS_DATA_INTERFACE_ID,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = USB_CLASS_CDC_DATA,
+ .bInterfaceSubClass = 0,
+ .bInterfaceProtocol = 0,
+ .iInterface = GS_DATA_STR_ID,
+};
+
+static const struct usb_cdc_header_desc gs_header_desc = {
+ .bLength = sizeof(gs_header_desc),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubType = USB_CDC_HEADER_TYPE,
+ .bcdCDC = __constant_cpu_to_le16(0x0110),
+};
+
+static const struct usb_cdc_call_mgmt_descriptor gs_call_mgmt_descriptor = {
+ .bLength = sizeof(gs_call_mgmt_descriptor),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
+ .bmCapabilities = 0,
+ .bDataInterface = 1, /* index of data interface */
+};
+
+static struct usb_cdc_acm_descriptor gs_acm_descriptor = {
+ .bLength = sizeof(gs_acm_descriptor),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubType = USB_CDC_ACM_TYPE,
+ .bmCapabilities = 0,
+};
+
+static const struct usb_cdc_union_desc gs_union_desc = {
+ .bLength = sizeof(gs_union_desc),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubType = USB_CDC_UNION_TYPE,
+ .bMasterInterface0 = 0, /* index of control interface */
+ .bSlaveInterface0 = 1, /* index of data interface */
+};
+
+static struct usb_endpoint_descriptor gs_fullspeed_notify_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
+ .bInterval = 1 << GS_LOG2_NOTIFY_INTERVAL,
+};
+
+static struct usb_endpoint_descriptor gs_fullspeed_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor gs_fullspeed_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static const struct usb_descriptor_header *gs_bulk_fullspeed_function[] = {
+ (struct usb_descriptor_header *) &gs_otg_descriptor,
+ (struct usb_descriptor_header *) &gs_bulk_interface_desc,
+ (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
+ (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
+ NULL,
+};
+
+static const struct usb_descriptor_header *gs_acm_fullspeed_function[] = {
+ (struct usb_descriptor_header *) &gs_otg_descriptor,
+ (struct usb_descriptor_header *) &gs_control_interface_desc,
+ (struct usb_descriptor_header *) &gs_header_desc,
+ (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
+ (struct usb_descriptor_header *) &gs_acm_descriptor,
+ (struct usb_descriptor_header *) &gs_union_desc,
+ (struct usb_descriptor_header *) &gs_fullspeed_notify_desc,
+ (struct usb_descriptor_header *) &gs_data_interface_desc,
+ (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
+ (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
+ NULL,
+};
+
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+static struct usb_endpoint_descriptor gs_highspeed_notify_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
+ .bInterval = GS_LOG2_NOTIFY_INTERVAL+4,
+};
+
+static struct usb_endpoint_descriptor gs_highspeed_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor gs_highspeed_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(512),
+};
+
+static struct usb_qualifier_descriptor gs_qualifier_desc = {
+ .bLength = sizeof(struct usb_qualifier_descriptor),
+ .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
+ .bcdUSB = __constant_cpu_to_le16 (0x0200),
+ /* assumes ep0 uses the same value for both speeds ... */
+ .bNumConfigurations = GS_NUM_CONFIGS,
+};
+
+static const struct usb_descriptor_header *gs_bulk_highspeed_function[] = {
+ (struct usb_descriptor_header *) &gs_otg_descriptor,
+ (struct usb_descriptor_header *) &gs_bulk_interface_desc,
+ (struct usb_descriptor_header *) &gs_highspeed_in_desc,
+ (struct usb_descriptor_header *) &gs_highspeed_out_desc,
+ NULL,
+};
+
+static const struct usb_descriptor_header *gs_acm_highspeed_function[] = {
+ (struct usb_descriptor_header *) &gs_otg_descriptor,
+ (struct usb_descriptor_header *) &gs_control_interface_desc,
+ (struct usb_descriptor_header *) &gs_header_desc,
+ (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
+ (struct usb_descriptor_header *) &gs_acm_descriptor,
+ (struct usb_descriptor_header *) &gs_union_desc,
+ (struct usb_descriptor_header *) &gs_highspeed_notify_desc,
+ (struct usb_descriptor_header *) &gs_data_interface_desc,
+ (struct usb_descriptor_header *) &gs_highspeed_in_desc,
+ (struct usb_descriptor_header *) &gs_highspeed_out_desc,
+ NULL,
+};
+
+#endif /* CONFIG_USB_GADGET_DUALSPEED */
+
+
+/* Module */
+MODULE_DESCRIPTION(GS_LONG_NAME);
+MODULE_AUTHOR("Al Borchers");
+MODULE_LICENSE("GPL");
+
+#ifdef GS_DEBUG
+module_param(debug, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on");
+#endif
+
+module_param(read_q_size, uint, S_IRUGO);
+MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32");
+
+module_param(write_q_size, uint, S_IRUGO);
+MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32");
+
+module_param(write_buf_size, uint, S_IRUGO);
+MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192");
+
+module_param(use_acm, uint, S_IRUGO);
+MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no");
+
+module_init(gs_module_init);
+module_exit(gs_module_exit);
+
+/*
+* gs_module_init
+*
+* Register as a USB gadget driver and a tty driver.
+*/
+static int __init gs_module_init(void)
+{
+ int i;
+ int retval;
+
+ retval = usb_gadget_register_driver(&gs_gadget_driver);
+ if (retval) {
+ printk(KERN_ERR "gs_module_init: cannot register gadget driver, ret=%d\n", retval);
+ return retval;
+ }
+
+ gs_tty_driver = alloc_tty_driver(GS_NUM_PORTS);
+ if (!gs_tty_driver)
+ return -ENOMEM;
+ gs_tty_driver->owner = THIS_MODULE;
+ gs_tty_driver->driver_name = GS_SHORT_NAME;
+ gs_tty_driver->name = "ttygs";
+ gs_tty_driver->devfs_name = "usb/ttygs/";
+ gs_tty_driver->major = GS_MAJOR;
+ gs_tty_driver->minor_start = GS_MINOR_START;
+ gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+ gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+ gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
+ gs_tty_driver->init_termios = tty_std_termios;
+ gs_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ tty_set_operations(gs_tty_driver, &gs_tty_ops);
+
+ for (i=0; i < GS_NUM_PORTS; i++)
+ sema_init(&gs_open_close_sem[i], 1);
+
+ retval = tty_register_driver(gs_tty_driver);
+ if (retval) {
+ usb_gadget_unregister_driver(&gs_gadget_driver);
+ put_tty_driver(gs_tty_driver);
+ printk(KERN_ERR "gs_module_init: cannot register tty driver, ret=%d\n", retval);
+ return retval;
+ }
+
+ printk(KERN_INFO "gs_module_init: %s %s loaded\n", GS_LONG_NAME, GS_VERSION_STR);
+ return 0;
+}
+
+/*
+* gs_module_exit
+*
+* Unregister as a tty driver and a USB gadget driver.
+*/
+static void __exit gs_module_exit(void)
+{
+ tty_unregister_driver(gs_tty_driver);
+ put_tty_driver(gs_tty_driver);
+ usb_gadget_unregister_driver(&gs_gadget_driver);
+
+ printk(KERN_INFO "gs_module_exit: %s %s unloaded\n", GS_LONG_NAME, GS_VERSION_STR);
+}
+
+/* TTY Driver */
+
+/*
+ * gs_open
+ */
+static int gs_open(struct tty_struct *tty, struct file *file)
+{
+ int port_num;
+ unsigned long flags;
+ struct gs_port *port;
+ struct gs_dev *dev;
+ struct gs_buf *buf;
+ struct semaphore *sem;
+ int ret;
+
+ port_num = tty->index;
+
+ gs_debug("gs_open: (%d,%p,%p)\n", port_num, tty, file);
+
+ if (port_num < 0 || port_num >= GS_NUM_PORTS) {
+ printk(KERN_ERR "gs_open: (%d,%p,%p) invalid port number\n",
+ port_num, tty, file);
+ return -ENODEV;
+ }
+
+ dev = gs_device;
+
+ if (dev == NULL) {
+ printk(KERN_ERR "gs_open: (%d,%p,%p) NULL device pointer\n",
+ port_num, tty, file);
+ return -ENODEV;
+ }
+
+ sem = &gs_open_close_sem[port_num];
+ if (down_interruptible(sem)) {
+ printk(KERN_ERR
+ "gs_open: (%d,%p,%p) interrupted waiting for semaphore\n",
+ port_num, tty, file);
+ return -ERESTARTSYS;
+ }
+
+ spin_lock_irqsave(&dev->dev_lock, flags);
+
+ if (dev->dev_config == GS_NO_CONFIG_ID) {
+ printk(KERN_ERR
+ "gs_open: (%d,%p,%p) device is not connected\n",
+ port_num, tty, file);
+ ret = -ENODEV;
+ goto exit_unlock_dev;
+ }
+
+ port = dev->dev_port[port_num];
+
+ if (port == NULL) {
+ printk(KERN_ERR "gs_open: (%d,%p,%p) NULL port pointer\n",
+ port_num, tty, file);
+ ret = -ENODEV;
+ goto exit_unlock_dev;
+ }
+
+ spin_lock(&port->port_lock);
+ spin_unlock(&dev->dev_lock);
+
+ if (port->port_dev == NULL) {
+ printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (1)\n",
+ port_num, tty, file);
+ ret = -EIO;
+ goto exit_unlock_port;
+ }
+
+ if (port->port_open_count > 0) {
+ ++port->port_open_count;
+ gs_debug("gs_open: (%d,%p,%p) already open\n",
+ port_num, tty, file);
+ ret = 0;
+ goto exit_unlock_port;
+ }
+
+ tty->driver_data = NULL;
+
+ /* mark port as in use, we can drop port lock and sleep if necessary */
+ port->port_in_use = 1;
+
+ /* allocate write buffer on first open */
+ if (port->port_write_buf == NULL) {
+ spin_unlock_irqrestore(&port->port_lock, flags);
+ buf = gs_buf_alloc(write_buf_size, GFP_KERNEL);
+ spin_lock_irqsave(&port->port_lock, flags);
+
+ /* might have been disconnected while asleep, check */
+ if (port->port_dev == NULL) {
+ printk(KERN_ERR
+ "gs_open: (%d,%p,%p) port disconnected (2)\n",
+ port_num, tty, file);
+ port->port_in_use = 0;
+ ret = -EIO;
+ goto exit_unlock_port;
+ }
+
+ if ((port->port_write_buf=buf) == NULL) {
+ printk(KERN_ERR "gs_open: (%d,%p,%p) cannot allocate port write buffer\n",
+ port_num, tty, file);
+ port->port_in_use = 0;
+ ret = -ENOMEM;
+ goto exit_unlock_port;
+ }
+
+ }
+
+ /* wait for carrier detect (not implemented) */
+
+ /* might have been disconnected while asleep, check */
+ if (port->port_dev == NULL) {
+ printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (3)\n",
+ port_num, tty, file);
+ port->port_in_use = 0;
+ ret = -EIO;
+ goto exit_unlock_port;
+ }
+
+ tty->driver_data = port;
+ port->port_tty = tty;
+ port->port_open_count = 1;
+ port->port_in_use = 0;
+
+ gs_debug("gs_open: (%d,%p,%p) completed\n", port_num, tty, file);
+
+ ret = 0;
+
+exit_unlock_port:
+ spin_unlock_irqrestore(&port->port_lock, flags);
+ up(sem);
+ return ret;
+
+exit_unlock_dev:
+ spin_unlock_irqrestore(&dev->dev_lock, flags);
+ up(sem);
+ return ret;
+
+}
+
+/*
+ * gs_close
+ */
+static void gs_close(struct tty_struct *tty, struct file *file)
+{
+ unsigned long flags;
+ struct gs_port *port = tty->driver_data;
+ struct semaphore *sem;
+
+ if (port == NULL) {
+ printk(KERN_ERR "gs_close: NULL port pointer\n");
+ return;
+ }
+
+ gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
+
+ sem = &gs_open_close_sem[port->port_num];
+ down(sem);
+
+ spin_lock_irqsave(&port->port_lock, flags);
+
+ if (port->port_open_count == 0) {
+ printk(KERN_ERR
+ "gs_close: (%d,%p,%p) port is already closed\n",
+ port->port_num, tty, file);
+ goto exit;
+ }
+
+ if (port->port_open_count > 1) {
+ --port->port_open_count;
+ goto exit;
+ }
+
+ /* free disconnected port on final close */
+ if (port->port_dev == NULL) {
+ kfree(port);
+ goto exit;
+ }
+
+ /* mark port as closed but in use, we can drop port lock */
+ /* and sleep if necessary */
+ port->port_in_use = 1;
+ port->port_open_count = 0;
+
+ /* wait for write buffer to drain, or */
+ /* at most GS_CLOSE_TIMEOUT seconds */
+ if (gs_buf_data_avail(port->port_write_buf) > 0) {
+ wait_cond_interruptible_timeout(port->port_write_wait,
+ port->port_dev == NULL
+ || gs_buf_data_avail(port->port_write_buf) == 0,
+ &port->port_lock, flags, GS_CLOSE_TIMEOUT * HZ);
+ }
+
+ /* free disconnected port on final close */
+ /* (might have happened during the above sleep) */
+ if (port->port_dev == NULL) {
+ kfree(port);
+ goto exit;
+ }
+
+ gs_buf_clear(port->port_write_buf);
+
+ tty->driver_data = NULL;
+ port->port_tty = NULL;
+ port->port_in_use = 0;
+
+ gs_debug("gs_close: (%d,%p,%p) completed\n",
+ port->port_num, tty, file);
+
+exit:
+ spin_unlock_irqrestore(&port->port_lock, flags);
+ up(sem);
+}
+
+/*
+ * gs_write
+ */
+static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+ unsigned long flags;
+ struct gs_port *port = tty->driver_data;
+ int ret;
+
+ if (port == NULL) {
+ printk(KERN_ERR "gs_write: NULL port pointer\n");
+ return -EIO;
+ }
+
+ gs_debug("gs_write: (%d,%p) writing %d bytes\n", port->port_num, tty,
+ count);
+
+ if (count == 0)
+ return 0;
+
+ spin_lock_irqsave(&port->port_lock, flags);
+
+ if (port->port_dev == NULL) {
+ printk(KERN_ERR "gs_write: (%d,%p) port is not connected\n",
+ port->port_num, tty);
+ ret = -EIO;
+ goto exit;
+ }
+
+ if (port->port_open_count == 0) {
+ printk(KERN_ERR "gs_write: (%d,%p) port is closed\n",
+ port->port_num, tty);
+ ret = -EBADF;
+ goto exit;
+ }
+
+ count = gs_buf_put(port->port_write_buf, buf, count);
+
+ spin_unlock_irqrestore(&port->port_lock, flags);
+
+ gs_send(gs_device);
+
+ gs_debug("gs_write: (%d,%p) wrote %d bytes\n", port->port_num, tty,
+ count);
+
+ return count;
+
+exit:
+ spin_unlock_irqrestore(&port->port_lock, flags);
+ return ret;
+}
+
+/*
+ * gs_put_char
+ */
+static void gs_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ unsigned long flags;
+ struct gs_port *port = tty->driver_data;
+
+ if (port == NULL) {
+ printk(KERN_ERR "gs_put_char: NULL port pointer\n");
+ return;
+ }
+
+ gs_debug("gs_put_char: (%d,%p) char=0x%x, called from %p, %p, %p\n", port->port_num, tty, ch, __builtin_return_address(0), __builtin_return_address(1), __builtin_return_address(2));
+
+ spin_lock_irqsave(&port->port_lock, flags);
+
+ if (port->port_dev == NULL) {
+ printk(KERN_ERR "gs_put_char: (%d,%p) port is not connected\n",
+ port->port_num, tty);
+ goto exit;
+ }
+
+ if (port->port_open_count == 0) {
+ printk(KERN_ERR "gs_put_char: (%d,%p) port is closed\n",
+ port->port_num, tty);
+ goto exit;
+ }
+
+ gs_buf_put(port->port_write_buf, &ch, 1);
+
+exit:
+ spin_unlock_irqrestore(&port->port_lock, flags);
+}
+
+/*
+ * gs_flush_chars
+ */
+static void gs_flush_chars(struct tty_struct *tty)
+{
+ unsigned long flags;
+ struct gs_port *port = tty->driver_data;
+
+ if (port == NULL) {
+ printk(KERN_ERR "gs_flush_chars: NULL port pointer\n");
+ return;
+ }
+
+ gs_debug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);
+
+ spin_lock_irqsave(&port->port_lock, flags);
+
+ if (port->port_dev == NULL) {
+ printk(KERN_ERR
+ "gs_flush_chars: (%d,%p) port is not connected\n",
+ port->port_num, tty);
+ goto exit;
+ }
+
+ if (port->port_open_count == 0) {
+ printk(KERN_ERR "gs_flush_chars: (%d,%p) port is closed\n",
+ port->port_num, tty);
+ goto exit;
+ }
+
+ spin_unlock_irqrestore(&port->port_lock, flags);
+
+ gs_send(gs_device);
+
+ return;
+
+exit:
+ spin_unlock_irqrestore(&port->port_lock, flags);
+}
+
+/*
+ * gs_write_room
+ */
+static int gs_write_room(struct tty_struct *tty)
+{
+
+ int room = 0;
+ unsigned long flags;
+ struct gs_port *port = tty->driver_data;
+
+
+ if (port == NULL)
+ return 0;
+
+ spin_lock_irqsave(&port->port_lock, flags);
+
+ if (port->port_dev != NULL && port->port_open_count > 0
+ && port->port_write_buf != NULL)
+ room = gs_buf_space_avail(port->port_write_buf);
+
+ spin_unlock_irqrestore(&port->port_lock, flags);
+
+ gs_debug("gs_write_room: (%d,%p) room=%d\n",
+ port->port_num, tty, room);
+
+ return room;
+}
+
+/*
+ * gs_chars_in_buffer
+ */
+static int gs_chars_in_buffer(struct tty_struct *tty)
+{
+ int chars = 0;
+ unsigned long flags;
+ struct gs_port *port = tty->driver_data;
+
+ if (port == NULL)
+ return 0;
+
+ spin_lock_irqsave(&port->port_lock, flags);
+
+ if (port->port_dev != NULL && port->port_open_count > 0
+ && port->port_write_buf != NULL)
+ chars = gs_buf_data_avail(port->port_write_buf);
+
+ spin_unlock_irqrestore(&port->port_lock, flags);
+
+ gs_debug("gs_chars_in_buffer: (%d,%p) chars=%d\n",
+ port->port_num, tty, chars);
+
+ return chars;
+}
+
+/*
+ * gs_throttle
+ */
+static void gs_throttle(struct tty_struct *tty)
+{
+}
+
+/*
+ * gs_unthrottle
+ */
+static void gs_unthrottle(struct tty_struct *tty)
+{
+}
+
+/*
+ * gs_break
+ */
+static void gs_break(struct tty_struct *tty, int break_state)
+{
+}
+
+/*
+ * gs_ioctl
+ */
+static int gs_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct gs_port *port = tty->driver_data;
+
+ if (port == NULL) {
+ printk(KERN_ERR "gs_ioctl: NULL port pointer\n");
+ return -EIO;
+ }
+
+ gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n",
+ port->port_num, tty, file, cmd, arg);
+
+ /* handle ioctls */
+
+ /* could not handle ioctl */
+ return -ENOIOCTLCMD;
+}
+
+/*
+ * gs_set_termios
+ */
+static void gs_set_termios(struct tty_struct *tty, struct termios *old)
+{
+}
+
+/*
+* gs_send
+*
+* This function finds available write requests, calls
+* gs_send_packet to fill these packets with data, and
+* continues until either there are no more write requests
+* available or no more data to send. This function is
+* run whenever data arrives or write requests are available.
+*/
+static int gs_send(struct gs_dev *dev)
+{
+ int ret,len;
+ unsigned long flags;
+ struct usb_ep *ep;
+ struct usb_request *req;
+ struct gs_req_entry *req_entry;
+
+ if (dev == NULL) {
+ printk(KERN_ERR "gs_send: NULL device pointer\n");
+ return -ENODEV;
+ }
+
+ spin_lock_irqsave(&dev->dev_lock, flags);
+
+ ep = dev->dev_in_ep;
+
+ while(!list_empty(&dev->dev_req_list)) {
+
+ req_entry = list_entry(dev->dev_req_list.next,
+ struct gs_req_entry, re_entry);
+
+ req = req_entry->re_req;
+
+ len = gs_send_packet(dev, req->buf, ep->maxpacket);
+
+ if (len > 0) {
+gs_debug_level(3, "gs_send: len=%d, 0x%2.2x 0x%2.2x 0x%2.2x ...\n", len, *((unsigned char *)req->buf), *((unsigned char *)req->buf+1), *((unsigned char *)req->buf+2));
+ list_del(&req_entry->re_entry);
+ req->length = len;
+ if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
+ printk(KERN_ERR
+ "gs_send: cannot queue read request, ret=%d\n",
+ ret);
+ break;
+ }
+ } else {
+ break;
+ }
+
+ }
+
+ spin_unlock_irqrestore(&dev->dev_lock, flags);
+
+ return 0;
+}
+
+/*
+ * gs_send_packet
+ *
+ * If there is data to send, a packet is built in the given
+ * buffer and the size is returned. If there is no data to
+ * send, 0 is returned. If there is any error a negative
+ * error number is returned.
+ *
+ * Called during USB completion routine, on interrupt time.
+ *
+ * We assume that disconnect will not happen until all completion
+ * routines have completed, so we can assume that the dev_port
+ * array does not change during the lifetime of this function.
+ */
+static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size)
+{
+ unsigned int len;
+ struct gs_port *port;
+
+ /* TEMPORARY -- only port 0 is supported right now */
+ port = dev->dev_port[0];
+
+ if (port == NULL) {
+ printk(KERN_ERR
+ "gs_send_packet: port=%d, NULL port pointer\n",
+ 0);
+ return -EIO;
+ }
+
+ spin_lock(&port->port_lock);
+
+ len = gs_buf_data_avail(port->port_write_buf);
+ if (len < size)
+ size = len;
+
+ if (size == 0)
+ goto exit;
+
+ size = gs_buf_get(port->port_write_buf, packet, size);
+
+ if (port->port_tty)
+ wake_up_interruptible(&port->port_tty->write_wait);
+
+exit:
+ spin_unlock(&port->port_lock);
+ return size;
+}
+
+/*
+ * gs_recv_packet
+ *
+ * Called for each USB packet received. Reads the packet
+ * header and stuffs the data in the appropriate tty buffer.
+ * Returns 0 if successful, or a negative error number.
+ *
+ * Called during USB completion routine, on interrupt time.
+ *
+ * We assume that disconnect will not happen until all completion
+ * routines have completed, so we can assume that the dev_port
+ * array does not change during the lifetime of this function.
+ */
+static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size)
+{
+ unsigned int len;
+ struct gs_port *port;
+ int ret;
+
+ /* TEMPORARY -- only port 0 is supported right now */
+ port = dev->dev_port[0];
+
+ if (port == NULL) {
+ printk(KERN_ERR "gs_recv_packet: port=%d, NULL port pointer\n",
+ port->port_num);
+ return -EIO;
+ }
+
+ spin_lock(&port->port_lock);
+
+ if (port->port_open_count == 0) {
+ printk(KERN_ERR "gs_recv_packet: port=%d, port is closed\n",
+ port->port_num);
+ ret = -EIO;
+ goto exit;
+ }
+
+ if (port->port_tty == NULL) {
+ printk(KERN_ERR "gs_recv_packet: port=%d, NULL tty pointer\n",
+ port->port_num);
+ ret = -EIO;
+ goto exit;
+ }
+
+ if (port->port_tty->magic != TTY_MAGIC) {
+ printk(KERN_ERR "gs_recv_packet: port=%d, bad tty magic\n",
+ port->port_num);
+ ret = -EIO;
+ goto exit;
+ }
+
+ len = (unsigned int)(TTY_FLIPBUF_SIZE - port->port_tty->flip.count);
+ if (len < size)
+ size = len;
+
+ if (size > 0) {
+ memcpy(port->port_tty->flip.char_buf_ptr, packet, size);
+ port->port_tty->flip.char_buf_ptr += size;
+ port->port_tty->flip.count += size;
+ tty_flip_buffer_push(port->port_tty);
+ wake_up_interruptible(&port->port_tty->read_wait);
+ }
+
+ ret = 0;
+
+exit:
+ spin_unlock(&port->port_lock);
+ return ret;
+}
+
+/*
+* gs_read_complete
+*/
+static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ int ret;
+ struct gs_dev *dev = ep->driver_data;
+
+ if (dev == NULL) {
+ printk(KERN_ERR "gs_read_complete: NULL device pointer\n");
+ return;
+ }
+
+ switch(req->status) {
+ case 0:
+ /* normal completion */
+ gs_recv_packet(dev, req->buf, req->actual);
+requeue:
+ req->length = ep->maxpacket;
+ if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
+ printk(KERN_ERR
+ "gs_read_complete: cannot queue read request, ret=%d\n",
+ ret);
+ }
+ break;
+
+ case -ESHUTDOWN:
+ /* disconnect */
+ gs_debug("gs_read_complete: shutdown\n");
+ gs_free_req(ep, req);
+ break;
+
+ default:
+ /* unexpected */
+ printk(KERN_ERR
+ "gs_read_complete: unexpected status error, status=%d\n",
+ req->status);
+ goto requeue;
+ break;
+ }
+}
+
+/*
+* gs_write_complete
+*/
+static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct gs_dev *dev = ep->driver_data;
+ struct gs_req_entry *gs_req = req->context;
+
+ if (dev == NULL) {
+ printk(KERN_ERR "gs_write_complete: NULL device pointer\n");
+ return;
+ }
+
+ switch(req->status) {
+ case 0:
+ /* normal completion */
+requeue:
+ if (gs_req == NULL) {
+ printk(KERN_ERR
+ "gs_write_complete: NULL request pointer\n");
+ return;
+ }
+
+ spin_lock(&dev->dev_lock);
+ list_add(&gs_req->re_entry, &dev->dev_req_list);
+ spin_unlock(&dev->dev_lock);
+
+ gs_send(dev);
+
+ break;
+
+ case -ESHUTDOWN:
+ /* disconnect */
+ gs_debug("gs_write_complete: shutdown\n");
+ gs_free_req(ep, req);
+ break;
+
+ default:
+ printk(KERN_ERR
+ "gs_write_complete: unexpected status error, status=%d\n",
+ req->status);
+ goto requeue;
+ break;
+ }
+}
+
+/* Gadget Driver */
+
+/*
+ * gs_bind
+ *
+ * Called on module load. Allocates and initializes the device
+ * structure and a control request.
+ */
+static int gs_bind(struct usb_gadget *gadget)
+{
+ int ret;
+ struct usb_ep *ep;
+ struct gs_dev *dev;
+
+ /* device specific */
+ if (gadget_is_net2280(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0001);
+ } else if (gadget_is_pxa(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0002);
+ } else if (gadget_is_sh(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0003);
+ /* sh doesn't support multiple interfaces or configs */
+ use_acm = 0;
+ } else if (gadget_is_sa1100(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0004);
+ /* sa1100 doesn't support necessary endpoints */
+ use_acm = 0;
+ } else if (gadget_is_goku(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0005);
+ } else if (gadget_is_mq11xx(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0006);
+ } else if (gadget_is_omap(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0007);
+ } else if (gadget_is_lh7a40x(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0008);
+ } else if (gadget_is_n9604(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0009);
+ } else if (gadget_is_pxa27x(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0011);
+ } else if (gadget_is_s3c2410(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0012);
+ } else if (gadget_is_at91(gadget)) {
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0013);
+ } else {
+ printk(KERN_WARNING "gs_bind: controller '%s' not recognized\n",
+ gadget->name);
+ /* unrecognized, but safe unless bulk is REALLY quirky */
+ gs_device_desc.bcdDevice =
+ __constant_cpu_to_le16(GS_VERSION_NUM|0x0099);
+ }
+
+ usb_ep_autoconfig_reset(gadget);
+
+ ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
+ if (!ep)
+ goto autoconf_fail;
+ EP_IN_NAME = ep->name;
+ ep->driver_data = ep; /* claim the endpoint */
+
+ ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
+ if (!ep)
+ goto autoconf_fail;
+ EP_OUT_NAME = ep->name;
+ ep->driver_data = ep; /* claim the endpoint */
+
+ if (use_acm) {
+ ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
+ if (!ep) {
+ printk(KERN_ERR "gs_bind: cannot run ACM on %s\n", gadget->name);
+ goto autoconf_fail;
+ }
+ gs_device_desc.idProduct = __constant_cpu_to_le16(
+ GS_CDC_PRODUCT_ID),
+ EP_NOTIFY_NAME = ep->name;
+ ep->driver_data = ep; /* claim the endpoint */
+ }
+
+ gs_device_desc.bDeviceClass = use_acm
+ ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
+ gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
+
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+ gs_qualifier_desc.bDeviceClass = use_acm
+ ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
+ /* assume ep0 uses the same packet size for both speeds */
+ gs_qualifier_desc.bMaxPacketSize0 = gs_device_desc.bMaxPacketSize0;
+ /* assume endpoints are dual-speed */
+ gs_highspeed_notify_desc.bEndpointAddress =
+ gs_fullspeed_notify_desc.bEndpointAddress;
+ gs_highspeed_in_desc.bEndpointAddress =
+ gs_fullspeed_in_desc.bEndpointAddress;
+ gs_highspeed_out_desc.bEndpointAddress =
+ gs_fullspeed_out_desc.bEndpointAddress;
+#endif /* CONFIG_USB_GADGET_DUALSPEED */
+
+ usb_gadget_set_selfpowered(gadget);
+
+ if (gadget->is_otg) {
+ gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
+ gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+ gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+ }
+
+ gs_device = dev = kmalloc(sizeof(struct gs_dev), GFP_KERNEL);
+ if (dev == NULL)
+ return -ENOMEM;
+
+ snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
+ system_utsname.sysname, system_utsname.release,
+ gadget->name);
+
+ memset(dev, 0, sizeof(struct gs_dev));
+ dev->dev_gadget = gadget;
+ spin_lock_init(&dev->dev_lock);
+ INIT_LIST_HEAD(&dev->dev_req_list);
+ set_gadget_data(gadget, dev);
+
+ if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
+ printk(KERN_ERR "gs_bind: cannot allocate ports\n");
+ gs_unbind(gadget);
+ return ret;
+ }
+
+ /* preallocate control response and buffer */
+ dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
+ GFP_KERNEL);
+ if (dev->dev_ctrl_req == NULL) {
+ gs_unbind(gadget);
+ return -ENOMEM;
+ }
+ dev->dev_ctrl_req->complete = gs_setup_complete;
+
+ gadget->ep0->driver_data = dev;
+
+ printk(KERN_INFO "gs_bind: %s %s bound\n",
+ GS_LONG_NAME, GS_VERSION_STR);
+
+ return 0;
+
+autoconf_fail:
+ printk(KERN_ERR "gs_bind: cannot autoconfigure on %s\n", gadget->name);
+ return -ENODEV;
+}
+
+/*
+ * gs_unbind
+ *
+ * Called on module unload. Frees the control request and device
+ * structure.
+ */
+static void gs_unbind(struct usb_gadget *gadget)
+{
+ struct gs_dev *dev = get_gadget_data(gadget);
+
+ gs_device = NULL;
+
+ /* read/write requests already freed, only control request remains */
+ if (dev != NULL) {
+ if (dev->dev_ctrl_req != NULL) {
+ gs_free_req(gadget->ep0, dev->dev_ctrl_req);
+ dev->dev_ctrl_req = NULL;
+ }
+ gs_free_ports(dev);
+ kfree(dev);
+ set_gadget_data(gadget, NULL);
+ }
+
+ printk(KERN_INFO "gs_unbind: %s %s unbound\n", GS_LONG_NAME,
+ GS_VERSION_STR);
+}
+
+/*
+ * gs_setup
+ *
+ * Implements all the control endpoint functionality that's not
+ * handled in hardware or the hardware driver.
+ *
+ * Returns the size of the data sent to the host, or a negative
+ * error number.
+ */
+static int gs_setup(struct usb_gadget *gadget,
+ const struct usb_ctrlrequest *ctrl)
+{
+ int ret = -EOPNOTSUPP;
+ struct gs_dev *dev = get_gadget_data(gadget);
+ struct usb_request *req = dev->dev_ctrl_req;
+ u16 wIndex = ctrl->wIndex;
+ u16 wValue = ctrl->wValue;
+ u16 wLength = ctrl->wLength;
+
+ switch (ctrl->bRequestType & USB_TYPE_MASK) {
+ case USB_TYPE_STANDARD:
+ ret = gs_setup_standard(gadget,ctrl);
+ break;
+
+ case USB_TYPE_CLASS:
+ ret = gs_setup_class(gadget,ctrl);
+ break;
+
+ default:
+ printk(KERN_ERR "gs_setup: unknown request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ wValue, wIndex, wLength);
+ break;
+ }
+
+ /* respond with data transfer before status phase? */
+ if (ret >= 0) {
+ req->length = ret;
+ req->zero = ret < wLength
+ && (ret % gadget->ep0->maxpacket) == 0;
+ ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
+ if (ret < 0) {
+ printk(KERN_ERR "gs_setup: cannot queue response, ret=%d\n",
+ ret);
+ req->status = 0;
+ gs_setup_complete(gadget->ep0, req);
+ }
+ }
+
+ /* device either stalls (ret < 0) or reports success */
+ return ret;
+}
+
+static int gs_setup_standard(struct usb_gadget *gadget,
+ const struct usb_ctrlrequest *ctrl)
+{
+ int ret = -EOPNOTSUPP;
+ struct gs_dev *dev = get_gadget_data(gadget);
+ struct usb_request *req = dev->dev_ctrl_req;
+ u16 wIndex = ctrl->wIndex;
+ u16 wValue = ctrl->wValue;
+ u16 wLength = ctrl->wLength;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_GET_DESCRIPTOR:
+ if (ctrl->bRequestType != USB_DIR_IN)
+ break;
+
+ switch (wValue >> 8) {
+ case USB_DT_DEVICE:
+ ret = min(wLength,
+ (u16)sizeof(struct usb_device_descriptor));
+ memcpy(req->buf, &gs_device_desc, ret);
+ break;
+
+#ifdef CONFIG_USB_GADGET_DUALSPEED
+ case USB_DT_DEVICE_QUALIFIER:
+ if (!gadget->is_dualspeed)
+ break;
+ ret = min(wLength,
+ (u16)sizeof(struct usb_qualifier_descriptor));
+ memcpy(req->buf, &gs_qualifier_desc, ret);
+ break;
+
+ case USB_DT_OTHER_SPEED_CONFIG:
+ if (!gadget->is_dualspeed)
+ break;
+ /* fall through */
+#endif /* CONFIG_USB_GADGET_DUALSPEED */
+ case USB_DT_CONFIG:
+ ret = gs_build_config_buf(req->buf, gadget->speed,
+ wValue >> 8, wValue & 0xff,
+ gadget->is_otg);
+ if (ret >= 0)
+ ret = min(wLength, (u16)ret);
+ break;
+
+ case USB_DT_STRING:
+ /* wIndex == language code. */
+ ret = usb_gadget_get_string(&gs_string_table,
+ wValue & 0xff, req->buf);
+ if (ret >= 0)
+ ret = min(wLength, (u16)ret);
+ break;
+ }
+ break;
+
+ case USB_REQ_SET_CONFIGURATION:
+ if (ctrl->bRequestType != 0)
+ break;
+ spin_lock(&dev->dev_lock);
+ ret = gs_set_config(dev, wValue);
+ spin_unlock(&dev->dev_lock);
+ break;
+
+ case USB_REQ_GET_CONFIGURATION:
+ if (ctrl->bRequestType != USB_DIR_IN)
+ break;
+ *(u8 *)req->buf = dev->dev_config;
+ ret = min(wLength, (u16)1);
+ break;
+
+ case USB_REQ_SET_INTERFACE:
+ if (ctrl->bRequestType != USB_RECIP_INTERFACE
+ || !dev->dev_config
+ || wIndex >= GS_MAX_NUM_INTERFACES)
+ break;
+ if (dev->dev_config == GS_BULK_CONFIG_ID
+ && wIndex != GS_BULK_INTERFACE_ID)
+ break;
+ /* no alternate interface settings */
+ if (wValue != 0)
+ break;
+ spin_lock(&dev->dev_lock);
+ /* PXA hardware partially handles SET_INTERFACE;
+ * we need to kluge around that interference. */
+ if (gadget_is_pxa(gadget)) {
+ ret = gs_set_config(dev, use_acm ?
+ GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
+ goto set_interface_done;
+ }
+ if (dev->dev_config != GS_BULK_CONFIG_ID
+ && wIndex == GS_CONTROL_INTERFACE_ID) {
+ if (dev->dev_notify_ep) {
+ usb_ep_disable(dev->dev_notify_ep);
+ usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
+ }
+ } else {
+ usb_ep_disable(dev->dev_in_ep);
+ usb_ep_disable(dev->dev_out_ep);
+ usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
+ usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
+ }
+ ret = 0;
+set_interface_done:
+ spin_unlock(&dev->dev_lock);
+ break;
+
+ case USB_REQ_GET_INTERFACE:
+ if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
+ || dev->dev_config == GS_NO_CONFIG_ID)
+ break;
+ if (wIndex >= GS_MAX_NUM_INTERFACES
+ || (dev->dev_config == GS_BULK_CONFIG_ID
+ && wIndex != GS_BULK_INTERFACE_ID)) {
+ ret = -EDOM;
+ break;
+ }
+ /* no alternate interface settings */
+ *(u8 *)req->buf = 0;
+ ret = min(wLength, (u16)1);
+ break;
+
+ default:
+ printk(KERN_ERR "gs_setup: unknown standard request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ wValue, wIndex, wLength);
+ break;
+ }
+
+ return ret;
+}
+
+static int gs_setup_class(struct usb_gadget *gadget,
+ const struct usb_ctrlrequest *ctrl)
+{
+ int ret = -EOPNOTSUPP;
+ struct gs_dev *dev = get_gadget_data(gadget);
+ struct gs_port *port = dev->dev_port[0]; /* ACM only has one port */
+ struct usb_request *req = dev->dev_ctrl_req;
+ u16 wIndex = ctrl->wIndex;
+ u16 wValue = ctrl->wValue;
+ u16 wLength = ctrl->wLength;
+
+ switch (ctrl->bRequest) {
+ case USB_CDC_REQ_SET_LINE_CODING:
+ ret = min(wLength,
+ (u16)sizeof(struct usb_cdc_line_coding));
+ if (port) {
+ spin_lock(&port->port_lock);
+ memcpy(&port->port_line_coding, req->buf, ret);
+ spin_unlock(&port->port_lock);
+ }
+ break;
+
+ case USB_CDC_REQ_GET_LINE_CODING:
+ port = dev->dev_port[0]; /* ACM only has one port */
+ ret = min(wLength,
+ (u16)sizeof(struct usb_cdc_line_coding));
+ if (port) {
+ spin_lock(&port->port_lock);
+ memcpy(req->buf, &port->port_line_coding, ret);
+ spin_unlock(&port->port_lock);
+ }
+ break;
+
+ case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
+ ret = 0;
+ break;
+
+ default:
+ printk(KERN_ERR "gs_setup: unknown class request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ wValue, wIndex, wLength);
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * gs_setup_complete
+ */
+static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ if (req->status || req->actual != req->length) {
+ printk(KERN_ERR "gs_setup_complete: status error, status=%d, actual=%d, length=%d\n",
+ req->status, req->actual, req->length);
+ }
+}
+
+/*
+ * gs_disconnect
+ *
+ * Called when the device is disconnected. Frees the closed
+ * ports and disconnects open ports. Open ports will be freed
+ * on close. Then reallocates the ports for the next connection.
+ */
+static void gs_disconnect(struct usb_gadget *gadget)
+{
+ unsigned long flags;
+ struct gs_dev *dev = get_gadget_data(gadget);
+
+ spin_lock_irqsave(&dev->dev_lock, flags);
+
+ gs_reset_config(dev);
+
+ /* free closed ports and disconnect open ports */
+ /* (open ports will be freed when closed) */
+ gs_free_ports(dev);
+
+ /* re-allocate ports for the next connection */
+ if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
+ printk(KERN_ERR "gs_disconnect: cannot re-allocate ports\n");
+
+ spin_unlock_irqrestore(&dev->dev_lock, flags);
+
+ printk(KERN_INFO "gs_disconnect: %s disconnected\n", GS_LONG_NAME);
+}
+
+/*
+ * gs_set_config
+ *
+ * Configures the device by enabling device specific
+ * optimizations, setting up the endpoints, allocating
+ * read and write requests and queuing read requests.
+ *
+ * The device lock must be held when calling this function.
+ */
+static int gs_set_config(struct gs_dev *dev, unsigned config)
+{
+ int i;
+ int ret = 0;
+ struct usb_gadget *gadget = dev->dev_gadget;
+ struct usb_ep *ep;
+ struct usb_endpoint_descriptor *ep_desc;
+ struct usb_request *req;
+ struct gs_req_entry *req_entry;
+
+ if (dev == NULL) {
+ printk(KERN_ERR "gs_set_config: NULL device pointer\n");
+ return 0;
+ }
+
+ if (config == dev->dev_config)
+ return 0;
+
+ gs_reset_config(dev);
+
+ switch (config) {
+ case GS_NO_CONFIG_ID:
+ return 0;
+ case GS_BULK_CONFIG_ID:
+ if (use_acm)
+ return -EINVAL;
+ /* device specific optimizations */
+ if (gadget_is_net2280(gadget))
+ net2280_set_fifo_mode(gadget, 1);
+ break;
+ case GS_ACM_CONFIG_ID:
+ if (!use_acm)
+ return -EINVAL;
+ /* device specific optimizations */
+ if (gadget_is_net2280(gadget))
+ net2280_set_fifo_mode(gadget, 1);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ dev->dev_config = config;
+
+ gadget_for_each_ep(ep, gadget) {
+
+ if (EP_NOTIFY_NAME
+ && strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
+ ep_desc = GS_SPEED_SELECT(
+ gadget->speed == USB_SPEED_HIGH,
+ &gs_highspeed_notify_desc,
+ &gs_fullspeed_notify_desc);
+ ret = usb_ep_enable(ep,ep_desc);
+ if (ret == 0) {
+ ep->driver_data = dev;
+ dev->dev_notify_ep = ep;
+ dev->dev_notify_ep_desc = ep_desc;
+ } else {
+ printk(KERN_ERR "gs_set_config: cannot enable notify endpoint %s, ret=%d\n",
+ ep->name, ret);
+ goto exit_reset_config;
+ }
+ }
+
+ else if (strcmp(ep->name, EP_IN_NAME) == 0) {
+ ep_desc = GS_SPEED_SELECT(
+ gadget->speed == USB_SPEED_HIGH,
+ &gs_highspeed_in_desc,
+ &gs_fullspeed_in_desc);
+ ret = usb_ep_enable(ep,ep_desc);
+ if (ret == 0) {
+ ep->driver_data = dev;
+ dev->dev_in_ep = ep;
+ dev->dev_in_ep_desc = ep_desc;
+ } else {
+ printk(KERN_ERR "gs_set_config: cannot enable in endpoint %s, ret=%d\n",
+ ep->name, ret);
+ goto exit_reset_config;
+ }
+ }
+
+ else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
+ ep_desc = GS_SPEED_SELECT(
+ gadget->speed == USB_SPEED_HIGH,
+ &gs_highspeed_out_desc,
+ &gs_fullspeed_out_desc);
+ ret = usb_ep_enable(ep,ep_desc);
+ if (ret == 0) {
+ ep->driver_data = dev;
+ dev->dev_out_ep = ep;
+ dev->dev_out_ep_desc = ep_desc;
+ } else {
+ printk(KERN_ERR "gs_set_config: cannot enable out endpoint %s, ret=%d\n",
+ ep->name, ret);
+ goto exit_reset_config;
+ }
+ }
+
+ }
+
+ if (dev->dev_in_ep == NULL || dev->dev_out_ep == NULL
+ || (config != GS_BULK_CONFIG_ID && dev->dev_notify_ep == NULL)) {
+ printk(KERN_ERR "gs_set_config: cannot find endpoints\n");
+ ret = -ENODEV;
+ goto exit_reset_config;
+ }
+
+ /* allocate and queue read requests */
+ ep = dev->dev_out_ep;
+ for (i=0; i<read_q_size && ret == 0; i++) {
+ if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
+ req->complete = gs_read_complete;
+ if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
+ printk(KERN_ERR "gs_set_config: cannot queue read request, ret=%d\n",
+ ret);
+ }
+ } else {
+ printk(KERN_ERR "gs_set_config: cannot allocate read requests\n");
+ ret = -ENOMEM;
+ goto exit_reset_config;
+ }
+ }
+
+ /* allocate write requests, and put on free list */
+ ep = dev->dev_in_ep;
+ for (i=0; i<write_q_size; i++) {
+ if ((req_entry=gs_alloc_req_entry(ep, ep->maxpacket, GFP_ATOMIC))) {
+ req_entry->re_req->complete = gs_write_complete;
+ list_add(&req_entry->re_entry, &dev->dev_req_list);
+ } else {
+ printk(KERN_ERR "gs_set_config: cannot allocate write requests\n");
+ ret = -ENOMEM;
+ goto exit_reset_config;
+ }
+ }
+
+ printk(KERN_INFO "gs_set_config: %s configured, %s speed %s config\n",
+ GS_LONG_NAME,
+ gadget->speed == USB_SPEED_HIGH ? "high" : "full",
+ config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
+
+ return 0;
+
+exit_reset_config:
+ gs_reset_config(dev);
+ return ret;
+}
+
+/*
+ * gs_reset_config
+ *
+ * Mark the device as not configured, disable all endpoints,
+ * which forces completion of pending I/O and frees queued
+ * requests, and free the remaining write requests on the
+ * free list.
+ *
+ * The device lock must be held when calling this function.
+ */
+static void gs_reset_config(struct gs_dev *dev)
+{
+ struct gs_req_entry *req_entry;
+
+ if (dev == NULL) {
+ printk(KERN_ERR "gs_reset_config: NULL device pointer\n");
+ return;
+ }
+
+ if (dev->dev_config == GS_NO_CONFIG_ID)
+ return;
+
+ dev->dev_config = GS_NO_CONFIG_ID;
+
+ /* free write requests on the free list */
+ while(!list_empty(&dev->dev_req_list)) {
+ req_entry = list_entry(dev->dev_req_list.next,
+ struct gs_req_entry, re_entry);
+ list_del(&req_entry->re_entry);
+ gs_free_req_entry(dev->dev_in_ep, req_entry);
+ }
+
+ /* disable endpoints, forcing completion of pending i/o; */
+ /* completion handlers free their requests in this case */
+ if (dev->dev_notify_ep) {
+ usb_ep_disable(dev->dev_notify_ep);
+ dev->dev_notify_ep = NULL;
+ }
+ if (dev->dev_in_ep) {
+ usb_ep_disable(dev->dev_in_ep);
+ dev->dev_in_ep = NULL;
+ }
+ if (dev->dev_out_ep) {
+ usb_ep_disable(dev->dev_out_ep);
+ dev->dev_out_ep = NULL;
+ }
+}
+
+/*
+ * gs_build_config_buf
+ *
+ * Builds the config descriptors in the given buffer and returns the
+ * length, or a negative error number.
+ */
+static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
+ u8 type, unsigned int index, int is_otg)
+{
+ int len;
+ int high_speed;
+ const struct usb_config_descriptor *config_desc;
+ const struct usb_descriptor_header **function;
+
+ if (index >= gs_device_desc.bNumConfigurations)
+ return -EINVAL;
+
+ /* other speed switches high and full speed */
+ high_speed = (speed == USB_SPEED_HIGH);
+ if (type == USB_DT_OTHER_SPEED_CONFIG)
+ high_speed = !high_speed;
+
+ if (use_acm) {
+ config_desc = &gs_acm_config_desc;
+ function = GS_SPEED_SELECT(high_speed,
+ gs_acm_highspeed_function,
+ gs_acm_fullspeed_function);
+ } else {
+ config_desc = &gs_bulk_config_desc;
+ function = GS_SPEED_SELECT(high_speed,
+ gs_bulk_highspeed_function,
+ gs_bulk_fullspeed_function);
+ }
+
+ /* for now, don't advertise srp-only devices */
+ if (!is_otg)
+ function++;
+
+ len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function);
+ if (len < 0)
+ return len;
+
+ ((struct usb_config_descriptor *)buf)->bDescriptorType = type;
+
+ return len;
+}
+
+/*
+ * gs_alloc_req
+ *
+ * Allocate a usb_request and its buffer. Returns a pointer to the
+ * usb_request or NULL if there is an error.
+ */
+static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len, int kmalloc_flags)
+{
+ struct usb_request *req;
+
+ if (ep == NULL)
+ return NULL;
+
+ req = usb_ep_alloc_request(ep, kmalloc_flags);
+
+ if (req != NULL) {
+ req->length = len;
+ req->buf = kmalloc(len, kmalloc_flags);
+ if (req->buf == NULL) {
+ usb_ep_free_request(ep, req);
+ return NULL;
+ }
+ }
+
+ return req;
+}
+
+/*
+ * gs_free_req
+ *
+ * Free a usb_request and its buffer.
+ */
+static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
+{
+ if (ep != NULL && req != NULL) {
+ kfree(req->buf);
+ usb_ep_free_request(ep, req);
+ }
+}
+
+/*
+ * gs_alloc_req_entry
+ *
+ * Allocates a request and its buffer, using the given
+ * endpoint, buffer len, and kmalloc flags.
+ */
+static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len, int kmalloc_flags)
+{
+ struct gs_req_entry *req;
+
+ req = kmalloc(sizeof(struct gs_req_entry), kmalloc_flags);
+ if (req == NULL)
+ return NULL;
+
+ req->re_req = gs_alloc_req(ep, len, kmalloc_flags);
+ if (req->re_req == NULL) {
+ kfree(req);
+ return NULL;
+ }
+
+ req->re_req->context = req;
+
+ return req;
+}
+
+/*
+ * gs_free_req_entry
+ *
+ * Frees a request and its buffer.
+ */
+static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req)
+{
+ if (ep != NULL && req != NULL) {
+ if (req->re_req != NULL)
+ gs_free_req(ep, req->re_req);
+ kfree(req);
+ }
+}
+
+/*
+ * gs_alloc_ports
+ *
+ * Allocate all ports and set the gs_dev struct to point to them.
+ * Return 0 if successful, or a negative error number.
+ *
+ * The device lock is normally held when calling this function.
+ */
+static int gs_alloc_ports(struct gs_dev *dev, int kmalloc_flags)
+{
+ int i;
+ struct gs_port *port;
+
+ if (dev == NULL)
+ return -EIO;
+
+ for (i=0; i<GS_NUM_PORTS; i++) {
+ if ((port=(struct gs_port *)kmalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
+ return -ENOMEM;
+
+ memset(port, 0, sizeof(struct gs_port));
+ port->port_dev = dev;
+ port->port_num = i;
+ port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
+ port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
+ port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
+ port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
+ spin_lock_init(&port->port_lock);
+ init_waitqueue_head(&port->port_write_wait);
+
+ dev->dev_port[i] = port;
+ }
+
+ return 0;
+}
+
+/*
+ * gs_free_ports
+ *
+ * Free all closed ports. Open ports are disconnected by
+ * freeing their write buffers, setting their device pointers
+ * and the pointers to them in the device to NULL. These
+ * ports will be freed when closed.
+ *
+ * The device lock is normally held when calling this function.
+ */
+static void gs_free_ports(struct gs_dev *dev)
+{
+ int i;
+ unsigned long flags;
+ struct gs_port *port;
+
+ if (dev == NULL)
+ return;
+
+ for (i=0; i<GS_NUM_PORTS; i++) {
+ if ((port=dev->dev_port[i]) != NULL) {
+ dev->dev_port[i] = NULL;
+
+ spin_lock_irqsave(&port->port_lock, flags);
+
+ if (port->port_write_buf != NULL) {
+ gs_buf_free(port->port_write_buf);
+ port->port_write_buf = NULL;
+ }
+
+ if (port->port_open_count > 0 || port->port_in_use) {
+ port->port_dev = NULL;
+ wake_up_interruptible(&port->port_write_wait);
+ if (port->port_tty) {
+ wake_up_interruptible(&port->port_tty->read_wait);
+ wake_up_interruptible(&port->port_tty->write_wait);
+ }
+ spin_unlock_irqrestore(&port->port_lock, flags);
+ } else {
+ spin_unlock_irqrestore(&port->port_lock, flags);
+ kfree(port);
+ }
+
+ }
+ }
+}
+
+/* Circular Buffer */
+
+/*
+ * gs_buf_alloc
+ *
+ * Allocate a circular buffer and all associated memory.
+ */
+static struct gs_buf *gs_buf_alloc(unsigned int size, int kmalloc_flags)
+{
+ struct gs_buf *gb;
+
+ if (size == 0)
+ return NULL;
+
+ gb = (struct gs_buf *)kmalloc(sizeof(struct gs_buf), kmalloc_flags);
+ if (gb == NULL)
+ return NULL;
+
+ gb->buf_buf = kmalloc(size, kmalloc_flags);
+ if (gb->buf_buf == NULL) {
+ kfree(gb);
+ return NULL;
+ }
+
+ gb->buf_size = size;
+ gb->buf_get = gb->buf_put = gb->buf_buf;
+
+ return gb;
+}
+
+/*
+ * gs_buf_free
+ *
+ * Free the buffer and all associated memory.
+ */
+void gs_buf_free(struct gs_buf *gb)
+{
+ if (gb != NULL) {
+ if (gb->buf_buf != NULL)
+ kfree(gb->buf_buf);
+ kfree(gb);
+ }
+}
+
+/*
+ * gs_buf_clear
+ *
+ * Clear out all data in the circular buffer.
+ */
+void gs_buf_clear(struct gs_buf *gb)
+{
+ if (gb != NULL)
+ gb->buf_get = gb->buf_put;
+ /* equivalent to a get of all data available */
+}
+
+/*
+ * gs_buf_data_avail
+ *
+ * Return the number of bytes of data available in the circular
+ * buffer.
+ */
+unsigned int gs_buf_data_avail(struct gs_buf *gb)
+{
+ if (gb != NULL)
+ return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
+ else
+ return 0;
+}
+
+/*
+ * gs_buf_space_avail
+ *
+ * Return the number of bytes of space available in the circular
+ * buffer.
+ */
+unsigned int gs_buf_space_avail(struct gs_buf *gb)
+{
+ if (gb != NULL)
+ return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
+ else
+ return 0;
+}
+
+/*
+ * gs_buf_put
+ *
+ * Copy data data from a user buffer and put it into the circular buffer.
+ * Restrict to the amount of space available.
+ *
+ * Return the number of bytes copied.
+ */
+unsigned int gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
+{
+ unsigned int len;
+
+ if (gb == NULL)
+ return 0;
+
+ len = gs_buf_space_avail(gb);
+ if (count > len)
+ count = len;
+
+ if (count == 0)
+ return 0;
+
+ len = gb->buf_buf + gb->buf_size - gb->buf_put;
+ if (count > len) {
+ memcpy(gb->buf_put, buf, len);
+ memcpy(gb->buf_buf, buf+len, count - len);
+ gb->buf_put = gb->buf_buf + count - len;
+ } else {
+ memcpy(gb->buf_put, buf, count);
+ if (count < len)
+ gb->buf_put += count;
+ else /* count == len */
+ gb->buf_put = gb->buf_buf;
+ }
+
+ return count;
+}
+
+/*
+ * gs_buf_get
+ *
+ * Get data from the circular buffer and copy to the given buffer.
+ * Restrict to the amount of data available.
+ *
+ * Return the number of bytes copied.
+ */
+unsigned int gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
+{
+ unsigned int len;
+
+ if (gb == NULL)
+ return 0;
+
+ len = gs_buf_data_avail(gb);
+ if (count > len)
+ count = len;
+
+ if (count == 0)
+ return 0;
+
+ len = gb->buf_buf + gb->buf_size - gb->buf_get;
+ if (count > len) {
+ memcpy(buf, gb->buf_get, len);
+ memcpy(buf+len, gb->buf_buf, count - len);
+ gb->buf_get = gb->buf_buf + count - len;
+ } else {
+ memcpy(buf, gb->buf_get, count);
+ if (count < len)
+ gb->buf_get += count;
+ else /* count == len */
+ gb->buf_get = gb->buf_buf;
+ }
+
+ return count;
+}