USB: serial: add symbol serial driver (68b44eae) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/usb/serial/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -515,6 +515,15 @@ config USB_SERIAL_SIERRAWIRELESS
		To compile this driver as a module, choose M here: the
		module will be called sierra.

		config USB_SERIAL_SYMBOL
		tristate "USB Symbol Barcode driver (serial mode)"
		help
		Say Y here if you want to use a Symbol USB Barcode device
		in serial emulation mode.

		To compile this driver as a module, choose M here: the
		module will be called symbolserial.

		config USB_SERIAL_TI
		tristate "USB TI 3410/5052 Serial Driver"
		help

drivers/usb/serial/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -49,6 +49,7 @@ obj-$(CONFIG_USB_SERIAL_SAFE) += safe_serial.o
		obj-$(CONFIG_USB_SERIAL_SIEMENS_MPI) += siemens_mpi.o
		obj-$(CONFIG_USB_SERIAL_SIERRAWIRELESS) += sierra.o
		obj-$(CONFIG_USB_SERIAL_SPCP8X5) += spcp8x5.o
		obj-$(CONFIG_USB_SERIAL_SYMBOL) += symbolserial.o
		obj-$(CONFIG_USB_SERIAL_TI) += ti_usb_3410_5052.o
		obj-$(CONFIG_USB_SERIAL_VISOR) += visor.o
		obj-$(CONFIG_USB_SERIAL_WHITEHEAT) += whiteheat.o

drivers/usb/serial/symbolserial.c

0 → 100644

+340 −0

Original line number	Diff line number	Diff line
		/*
		* Symbol USB barcode to serial driver
		*
		* Copyright (C) 2009 Greg Kroah-Hartman <gregkh@suse.de>
		* Copyright (C) 2009 Novell Inc.
		*
		* 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/init.h>
		#include <linux/tty.h>
		#include <linux/tty_driver.h>
		#include <linux/tty_flip.h>
		#include <linux/module.h>
		#include <linux/usb.h>
		#include <linux/usb/serial.h>
		#include <linux/uaccess.h>

		static int debug;

		static struct usb_device_id id_table[] = {
		{ USB_DEVICE(0x05e0, 0x0600) },
		{ },
		};
		MODULE_DEVICE_TABLE(usb, id_table);

		/* This structure holds all of the individual device information */
		struct symbol_private {
		struct usb_device *udev;
		struct usb_serial *serial;
		struct usb_serial_port *port;
		unsigned char *int_buffer;
		struct urb *int_urb;
		int buffer_size;
		u8 bInterval;
		u8 int_address;
		spinlock_t lock; /* protects the following flags */
		bool throttled;
		bool actually_throttled;
		bool rts;
		};

		static void symbol_int_callback(struct urb *urb)
		{
		struct symbol_private *priv = urb->context;
		unsigned char *data = urb->transfer_buffer;
		struct usb_serial_port *port = priv->port;
		int status = urb->status;
		struct tty_struct *tty;
		int result;
		int available_room = 0;
		int data_length;

		dbg("%s - port %d", __func__, port->number);

		switch (status) {
		case 0:
		/* success */
		break;
		case -ECONNRESET:
		case -ENOENT:
		case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dbg("%s - urb shutting down with status: %d",
		__func__, status);
		return;
		default:
		dbg("%s - nonzero urb status received: %d",
		__func__, status);
		goto exit;
		}

		usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length,
		data);

		if (urb->actual_length > 1) {
		data_length = urb->actual_length - 1;

		/*
		* Data from the device comes with a 1 byte header:
		*
		* <size of data>data...
		* This is real data to be sent to the tty layer
		* we pretty much just ignore the size and send everything
		* else to the tty layer.
		*/
		tty = tty_port_tty_get(&port->port);
		if (tty) {
		available_room = tty_buffer_request_room(tty,
		data_length);
		if (available_room) {
		tty_insert_flip_string(tty, &data[1],
		available_room);
		tty_flip_buffer_push(tty);
		}
		tty_kref_put(tty);
		}
		} else {
		dev_dbg(&priv->udev->dev,
		"Improper ammount of data received from the device, "
		"%d bytes", urb->actual_length);
		}

		exit:
		spin_lock(&priv->lock);

		/* Continue trying to always read if we should */
		if (!priv->throttled) {
		usb_fill_int_urb(priv->int_urb, priv->udev,
		usb_rcvintpipe(priv->udev,
		priv->int_address),
		priv->int_buffer, priv->buffer_size,
		symbol_int_callback, priv, priv->bInterval);
		result = usb_submit_urb(priv->int_urb, GFP_ATOMIC);
		if (result)
		dev_err(&port->dev,
		"%s - failed resubmitting read urb, error %d\n",
		__func__, result);
		} else
		priv->actually_throttled = true;
		spin_unlock(&priv->lock);
		}

		static int symbol_open(struct tty_struct tty, struct usb_serial_port port,
		struct file *filp)
		{
		struct symbol_private *priv = usb_get_serial_data(port->serial);
		unsigned long flags;
		int result = 0;

		dbg("%s - port %d", __func__, port->number);

		spin_lock_irqsave(&priv->lock, flags);
		priv->throttled = false;
		priv->actually_throttled = false;
		priv->port = port;
		spin_unlock_irqrestore(&priv->lock, flags);

		/*
		* Force low_latency on so that our tty_push actually forces the data
		* through, otherwise it is scheduled, and with high data rates (like
		* with OHCI) data can get lost.
		*/
		if (tty)
		tty->low_latency = 1;

		/* Start reading from the device */
		usb_fill_int_urb(priv->int_urb, priv->udev,
		usb_rcvintpipe(priv->udev, priv->int_address),
		priv->int_buffer, priv->buffer_size,
		symbol_int_callback, priv, priv->bInterval);
		result = usb_submit_urb(priv->int_urb, GFP_KERNEL);
		if (result)
		dev_err(&port->dev,
		"%s - failed resubmitting read urb, error %d\n",
		__func__, result);
		return result;
		}

		static void symbol_close(struct tty_struct tty, struct usb_serial_port port,
		struct file *filp)
		{
		struct symbol_private *priv = usb_get_serial_data(port->serial);

		dbg("%s - port %d", __func__, port->number);

		/* shutdown our urbs */
		usb_kill_urb(priv->int_urb);
		}

		static void symbol_throttle(struct tty_struct *tty)
		{
		struct usb_serial_port *port = tty->driver_data;
		struct symbol_private *priv = usb_get_serial_data(port->serial);
		unsigned long flags;

		dbg("%s - port %d", __func__, port->number);
		spin_lock_irqsave(&priv->lock, flags);
		priv->throttled = true;
		spin_unlock_irqrestore(&priv->lock, flags);
		}

		static void symbol_unthrottle(struct tty_struct *tty)
		{
		struct usb_serial_port *port = tty->driver_data;
		struct symbol_private *priv = usb_get_serial_data(port->serial);
		unsigned long flags;
		int result;

		dbg("%s - port %d", __func__, port->number);

		spin_lock_irqsave(&priv->lock, flags);
		priv->throttled = false;
		priv->actually_throttled = false;
		spin_unlock_irqrestore(&priv->lock, flags);

		priv->int_urb->dev = port->serial->dev;
		result = usb_submit_urb(priv->int_urb, GFP_ATOMIC);
		if (result)
		dev_err(&port->dev,
		"%s - failed submitting read urb, error %d\n",
		__func__, result);
		}

		static int symbol_startup(struct usb_serial *serial)
		{
		struct symbol_private *priv;
		struct usb_host_interface *intf;
		int i;
		int retval = -ENOMEM;
		bool int_in_found = false;

		/* create our private serial structure */
		priv = kzalloc(sizeof(*priv), GFP_KERNEL);
		if (priv == NULL) {
		dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
		return -ENOMEM;
		}
		spin_lock_init(&priv->lock);
		priv->serial = serial;
		priv->port = serial->port[0];
		priv->udev = serial->dev;

		/* find our interrupt endpoint */
		intf = serial->interface->altsetting;
		for (i = 0; i < intf->desc.bNumEndpoints; ++i) {
		struct usb_endpoint_descriptor *endpoint;

		endpoint = &intf->endpoint[i].desc;
		if (!usb_endpoint_is_int_in(endpoint))
		continue;

		priv->int_urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!priv->int_urb) {
		dev_err(&priv->udev->dev, "out of memory\n");
		goto error;
		}

		priv->buffer_size = le16_to_cpu(endpoint->wMaxPacketSize) * 2;
		priv->int_buffer = kmalloc(priv->buffer_size, GFP_KERNEL);
		if (!priv->int_buffer) {
		dev_err(&priv->udev->dev, "out of memory\n");
		goto error;
		}

		priv->int_address = endpoint->bEndpointAddress;
		priv->bInterval = endpoint->bInterval;

		/* set up our int urb */
		usb_fill_int_urb(priv->int_urb, priv->udev,
		usb_rcvintpipe(priv->udev,
		endpoint->bEndpointAddress),
		priv->int_buffer, priv->buffer_size,
		symbol_int_callback, priv, priv->bInterval);

		int_in_found = true;
		break;
		}

		if (!int_in_found) {
		dev_err(&priv->udev->dev,
		"Error - the proper endpoints were not found!\n");
		goto error;
		}

		usb_set_serial_data(serial, priv);
		return 0;

		error:
		usb_free_urb(priv->int_urb);
		kfree(priv->int_buffer);
		kfree(priv);
		return retval;
		}

		static void symbol_shutdown(struct usb_serial *serial)
		{
		struct symbol_private *priv = usb_get_serial_data(serial);

		dbg("%s", __func__);

		usb_kill_urb(priv->int_urb);
		usb_free_urb(priv->int_urb);
		kfree(priv->int_buffer);
		kfree(priv);
		usb_set_serial_data(serial, NULL);
		}

		static struct usb_driver symbol_driver = {
		.name = "symbol",
		.probe = usb_serial_probe,
		.disconnect = usb_serial_disconnect,
		.id_table = id_table,
		.no_dynamic_id = 1,
		};

		static struct usb_serial_driver symbol_device = {
		.driver = {
		.owner = THIS_MODULE,
		.name = "symbol",
		},
		.id_table = id_table,
		.usb_driver = &symbol_driver,
		.num_ports = 1,
		.attach = symbol_startup,
		.open = symbol_open,
		.close = symbol_close,
		.shutdown = symbol_shutdown,
		.throttle = symbol_throttle,
		.unthrottle = symbol_unthrottle,
		};

		static int __init symbol_init(void)
		{
		int retval;

		retval = usb_serial_register(&symbol_device);
		if (retval)
		return retval;
		retval = usb_register(&symbol_driver);
		if (retval)
		usb_serial_deregister(&symbol_device);
		return retval;
		}

		static void __exit symbol_exit(void)
		{
		usb_deregister(&symbol_driver);
		usb_serial_deregister(&symbol_device);
		}

		module_init(symbol_init);
		module_exit(symbol_exit);
		MODULE_LICENSE("GPL");

		module_param(debug, bool, S_IRUGO \| S_IWUSR);
		MODULE_PARM_DESC(debug, "Debug enabled or not");