zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/usb/serial/generic.c b/ap/os/linux/linux-3.4.x/drivers/usb/serial/generic.c
new file mode 100644
index 0000000..546177f
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/usb/serial/generic.c
@@ -0,0 +1,573 @@
+/*
+ * USB Serial Converter Generic functions
+ *
+ * Copyright (C) 2010 - 2011 Johan Hovold (jhovold@gmail.com)
+ * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/sysrq.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <linux/uaccess.h>
+#include <linux/kfifo.h>
+#include <linux/serial.h>
+
+static int debug;
+
+#ifdef CONFIG_USB_SERIAL_GENERIC
+
+static int generic_probe(struct usb_interface *interface,
+ const struct usb_device_id *id);
+
+static __u16 vendor = 0x05f9;
+static __u16 product = 0xffff;
+
+module_param(vendor, ushort, 0);
+MODULE_PARM_DESC(vendor, "User specified USB idVendor");
+
+module_param(product, ushort, 0);
+MODULE_PARM_DESC(product, "User specified USB idProduct");
+
+static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */
+
+/* we want to look at all devices, as the vendor/product id can change
+ * depending on the command line argument */
+static const struct usb_device_id generic_serial_ids[] = {
+ {.driver_info = 42},
+ {}
+};
+
+static struct usb_driver generic_driver = {
+ .name = "usbserial_generic",
+ .probe = generic_probe,
+ .disconnect = usb_serial_disconnect,
+ .id_table = generic_serial_ids,
+};
+
+/* All of the device info needed for the Generic Serial Converter */
+struct usb_serial_driver usb_serial_generic_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "generic",
+ },
+ .id_table = generic_device_ids,
+ .num_ports = 1,
+ .disconnect = usb_serial_generic_disconnect,
+ .release = usb_serial_generic_release,
+ .throttle = usb_serial_generic_throttle,
+ .unthrottle = usb_serial_generic_unthrottle,
+ .resume = usb_serial_generic_resume,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+ &usb_serial_generic_device, NULL
+};
+
+static int generic_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ const struct usb_device_id *id_pattern;
+
+ id_pattern = usb_match_id(interface, generic_device_ids);
+ if (id_pattern != NULL)
+ return usb_serial_probe(interface, id);
+ return -ENODEV;
+}
+#endif
+
+int usb_serial_generic_register(int _debug)
+{
+ int retval = 0;
+
+ debug = _debug;
+#ifdef CONFIG_USB_SERIAL_GENERIC
+ generic_device_ids[0].idVendor = vendor;
+ generic_device_ids[0].idProduct = product;
+ generic_device_ids[0].match_flags =
+ USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT;
+
+ /* register our generic driver with ourselves */
+ retval = usb_serial_register_drivers(&generic_driver, serial_drivers);
+#endif
+ return retval;
+}
+
+void usb_serial_generic_deregister(void)
+{
+#ifdef CONFIG_USB_SERIAL_GENERIC
+ /* remove our generic driver */
+ usb_serial_deregister_drivers(&generic_driver, serial_drivers);
+#endif
+}
+
+int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+ int result = 0;
+ unsigned long flags;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ /* clear the throttle flags */
+ spin_lock_irqsave(&port->lock, flags);
+ port->throttled = 0;
+ port->throttle_req = 0;
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ /* if we have a bulk endpoint, start reading from it */
+ if (port->bulk_in_size)
+ result = usb_serial_generic_submit_read_urbs(port, GFP_KERNEL);
+
+ return result;
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_open);
+
+static void generic_cleanup(struct usb_serial_port *port)
+{
+ struct usb_serial *serial = port->serial;
+ unsigned long flags;
+ int i;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ if (serial->dev) {
+ /* shutdown any bulk transfers that might be going on */
+ if (port->bulk_out_size) {
+ usb_kill_urb(port->write_urb);
+ for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
+ usb_kill_urb(port->write_urbs[i]);
+
+ spin_lock_irqsave(&port->lock, flags);
+ kfifo_reset_out(&port->write_fifo);
+ spin_unlock_irqrestore(&port->lock, flags);
+ }
+ if (port->bulk_in_size) {
+ for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
+ usb_kill_urb(port->read_urbs[i]);
+ }
+ }
+}
+
+void usb_serial_generic_close(struct usb_serial_port *port)
+{
+ dbg("%s - port %d", __func__, port->number);
+ generic_cleanup(port);
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_close);
+
+int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port,
+ void *dest, size_t size)
+{
+ return kfifo_out_locked(&port->write_fifo, dest, size, &port->lock);
+}
+
+/**
+ * usb_serial_generic_write_start - kick off an URB write
+ * @port: Pointer to the &struct usb_serial_port data
+ *
+ * Returns zero on success, or a negative errno value
+ */
+static int usb_serial_generic_write_start(struct usb_serial_port *port)
+{
+ struct urb *urb;
+ int count, result;
+ unsigned long flags;
+ int i;
+
+ if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags))
+ return 0;
+retry:
+ spin_lock_irqsave(&port->lock, flags);
+ if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) {
+ clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
+ spin_unlock_irqrestore(&port->lock, flags);
+ return 0;
+ }
+ i = (int)find_first_bit(&port->write_urbs_free,
+ ARRAY_SIZE(port->write_urbs));
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ urb = port->write_urbs[i];
+ count = port->serial->type->prepare_write_buffer(port,
+ urb->transfer_buffer,
+ port->bulk_out_size);
+ urb->transfer_buffer_length = count;
+ usb_serial_debug_data(debug, &port->dev, __func__, count,
+ urb->transfer_buffer);
+ spin_lock_irqsave(&port->lock, flags);
+ port->tx_bytes += count;
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ clear_bit(i, &port->write_urbs_free);
+ result = usb_submit_urb(urb, GFP_ATOMIC);
+ if (result) {
+ dev_err_console(port, "%s - error submitting urb: %d\n",
+ __func__, result);
+ set_bit(i, &port->write_urbs_free);
+ spin_lock_irqsave(&port->lock, flags);
+ port->tx_bytes -= count;
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);
+ return result;
+ }
+
+ goto retry; /* try sending off another urb */
+}
+
+/**
+ * usb_serial_generic_write - generic write function for serial USB devices
+ * @tty: Pointer to &struct tty_struct for the device
+ * @port: Pointer to the &usb_serial_port structure for the device
+ * @buf: Pointer to the data to write
+ * @count: Number of bytes to write
+ *
+ * Returns the number of characters actually written, which may be anything
+ * from zero to @count. If an error occurs, it returns the negative errno
+ * value.
+ */
+int usb_serial_generic_write(struct tty_struct *tty,
+ struct usb_serial_port *port, const unsigned char *buf, int count)
+{
+ int result;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ /* only do something if we have a bulk out endpoint */
+ if (!port->bulk_out_size)
+ return -ENODEV;
+
+ if (!count)
+ return 0;
+
+ count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
+ result = usb_serial_generic_write_start(port);
+ if (result)
+ return result;
+
+ return count;
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_write);
+
+int usb_serial_generic_write_room(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ unsigned long flags;
+ int room;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ if (!port->bulk_out_size)
+ return 0;
+
+ spin_lock_irqsave(&port->lock, flags);
+ room = kfifo_avail(&port->write_fifo);
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ dbg("%s - returns %d", __func__, room);
+ return room;
+}
+
+int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ unsigned long flags;
+ int chars;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ if (!port->bulk_out_size)
+ return 0;
+
+ spin_lock_irqsave(&port->lock, flags);
+ chars = kfifo_len(&port->write_fifo) + port->tx_bytes;
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ dbg("%s - returns %d", __func__, chars);
+ return chars;
+}
+
+static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port,
+ int index, gfp_t mem_flags)
+{
+ int res;
+
+ if (!test_and_clear_bit(index, &port->read_urbs_free))
+ return 0;
+
+ dbg("%s - port %d, urb %d\n", __func__, port->number, index);
+
+ res = usb_submit_urb(port->read_urbs[index], mem_flags);
+ if (res) {
+ if (res != -EPERM) {
+ dev_err(&port->dev,
+ "%s - usb_submit_urb failed: %d\n",
+ __func__, res);
+ }
+ set_bit(index, &port->read_urbs_free);
+ return res;
+ }
+
+ return 0;
+}
+
+int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port,
+ gfp_t mem_flags)
+{
+ int res;
+ int i;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
+ res = usb_serial_generic_submit_read_urb(port, i, mem_flags);
+ if (res)
+ goto err;
+ }
+
+ return 0;
+err:
+ for (; i >= 0; --i)
+ usb_kill_urb(port->read_urbs[i]);
+
+ return res;
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urbs);
+
+void usb_serial_generic_process_read_urb(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct tty_struct *tty;
+ char *ch = (char *)urb->transfer_buffer;
+ int i;
+
+ if (!urb->actual_length)
+ return;
+
+ tty = tty_port_tty_get(&port->port);
+ if (!tty)
+ return;
+
+ /* The per character mucking around with sysrq path it too slow for
+ stuff like 3G modems, so shortcircuit it in the 99.9999999% of cases
+ where the USB serial is not a console anyway */
+ if (!port->port.console || !port->sysrq)
+ tty_insert_flip_string(tty, ch, urb->actual_length);
+ else {
+ for (i = 0; i < urb->actual_length; i++, ch++) {
+ if (!usb_serial_handle_sysrq_char(port, *ch))
+ tty_insert_flip_char(tty, *ch, TTY_NORMAL);
+ }
+ }
+ tty_flip_buffer_push(tty);
+ tty_kref_put(tty);
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_process_read_urb);
+
+void usb_serial_generic_read_bulk_callback(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ unsigned char *data = urb->transfer_buffer;
+ unsigned long flags;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
+ if (urb == port->read_urbs[i])
+ break;
+ }
+ set_bit(i, &port->read_urbs_free);
+
+ dbg("%s - port %d, urb %d, len %d\n", __func__, port->number, i,
+ urb->actual_length);
+ if (urb->status) {
+ dbg("%s - non-zero urb status: %d\n", __func__, urb->status);
+ return;
+ }
+
+ usb_serial_debug_data(debug, &port->dev, __func__,
+ urb->actual_length, data);
+ port->serial->type->process_read_urb(urb);
+
+ /* Throttle the device if requested by tty */
+ spin_lock_irqsave(&port->lock, flags);
+ port->throttled = port->throttle_req;
+ if (!port->throttled) {
+ spin_unlock_irqrestore(&port->lock, flags);
+ usb_serial_generic_submit_read_urb(port, i, GFP_ATOMIC);
+ } else
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
+
+void usb_serial_generic_write_bulk_callback(struct urb *urb)
+{
+ unsigned long flags;
+ struct usb_serial_port *port = urb->context;
+ int status = urb->status;
+ int i;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
+ if (port->write_urbs[i] == urb)
+ break;
+
+ spin_lock_irqsave(&port->lock, flags);
+ port->tx_bytes -= urb->transfer_buffer_length;
+ set_bit(i, &port->write_urbs_free);
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ if (status) {
+ dbg("%s - non-zero urb status: %d", __func__, status);
+
+ spin_lock_irqsave(&port->lock, flags);
+ kfifo_reset_out(&port->write_fifo);
+ spin_unlock_irqrestore(&port->lock, flags);
+ } else {
+ usb_serial_generic_write_start(port);
+ }
+
+ usb_serial_port_softint(port);
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);
+
+void usb_serial_generic_throttle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ unsigned long flags;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ /* Set the throttle request flag. It will be picked up
+ * by usb_serial_generic_read_bulk_callback(). */
+ spin_lock_irqsave(&port->lock, flags);
+ port->throttle_req = 1;
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_throttle);
+
+void usb_serial_generic_unthrottle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ int was_throttled;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ /* Clear the throttle flags */
+ spin_lock_irq(&port->lock);
+ was_throttled = port->throttled;
+ port->throttled = port->throttle_req = 0;
+ spin_unlock_irq(&port->lock);
+
+ if (was_throttled)
+ usb_serial_generic_submit_read_urbs(port, GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_unthrottle);
+
+#ifdef CONFIG_MAGIC_SYSRQ
+int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
+{
+ if (port->sysrq && port->port.console) {
+ if (ch && time_before(jiffies, port->sysrq)) {
+ handle_sysrq(ch);
+ port->sysrq = 0;
+ return 1;
+ }
+ port->sysrq = 0;
+ }
+ return 0;
+}
+#else
+int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
+{
+ return 0;
+}
+#endif
+EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char);
+
+int usb_serial_handle_break(struct usb_serial_port *port)
+{
+ if (!port->sysrq) {
+ port->sysrq = jiffies + HZ*5;
+ return 1;
+ }
+ port->sysrq = 0;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_serial_handle_break);
+
+/**
+ * usb_serial_handle_dcd_change - handle a change of carrier detect state
+ * @port: usb_serial_port structure for the open port
+ * @tty: tty_struct structure for the port
+ * @status: new carrier detect status, nonzero if active
+ */
+void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port,
+ struct tty_struct *tty, unsigned int status)
+{
+ struct tty_port *port = &usb_port->port;
+
+ dbg("%s - port %d, status %d", __func__, usb_port->number, status);
+
+ if (status)
+ wake_up_interruptible(&port->open_wait);
+ else if (tty && !C_CLOCAL(tty))
+ tty_hangup(tty);
+}
+EXPORT_SYMBOL_GPL(usb_serial_handle_dcd_change);
+
+int usb_serial_generic_resume(struct usb_serial *serial)
+{
+ struct usb_serial_port *port;
+ int i, c = 0, r;
+
+ for (i = 0; i < serial->num_ports; i++) {
+ port = serial->port[i];
+ if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
+ continue;
+
+ if (port->bulk_in_size) {
+ r = usb_serial_generic_submit_read_urbs(port,
+ GFP_NOIO);
+ if (r < 0)
+ c++;
+ }
+
+ if (port->bulk_out_size) {
+ r = usb_serial_generic_write_start(port);
+ if (r < 0)
+ c++;
+ }
+ }
+
+ return c ? -EIO : 0;
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_resume);
+
+void usb_serial_generic_disconnect(struct usb_serial *serial)
+{
+ int i;
+
+ dbg("%s", __func__);
+
+ /* stop reads and writes on all ports */
+ for (i = 0; i < serial->num_ports; ++i)
+ generic_cleanup(serial->port[i]);
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_disconnect);
+
+void usb_serial_generic_release(struct usb_serial *serial)
+{
+ dbg("%s", __func__);
+}