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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9fbd1649d5
By rearranging the functions a bit, we can remove all function prototypes. Note, this also deleted the _close function, as it wasn't needed, it was doing the same thing the cleanup function did, so just call that instead. Cc: Aleksey Babahin <tamerlan311@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
506 lines
14 KiB
C
506 lines
14 KiB
C
/*
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Some of this code is credited to Linux USB open source files that are
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distributed with Linux.
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Copyright: 2007 Metrologic Instruments. All rights reserved.
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Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/tty.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/moduleparam.h>
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#include <linux/spinlock.h>
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#include <linux/errno.h>
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#include <linux/uaccess.h>
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#include <linux/usb/serial.h>
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/* Version Information */
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#define DRIVER_VERSION "v1.2.0.0"
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#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
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/* Product information. */
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#define FOCUS_VENDOR_ID 0x0C2E
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#define FOCUS_PRODUCT_ID 0x0720
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#define FOCUS_PRODUCT_ID_UNI 0x0710
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#define METROUSB_SET_REQUEST_TYPE 0x40
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#define METROUSB_SET_MODEM_CTRL_REQUEST 10
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#define METROUSB_SET_BREAK_REQUEST 0x40
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#define METROUSB_MCR_NONE 0x08 /* Deactivate DTR and RTS. */
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#define METROUSB_MCR_RTS 0x0a /* Activate RTS. */
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#define METROUSB_MCR_DTR 0x09 /* Activate DTR. */
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#define WDR_TIMEOUT 5000 /* default urb timeout. */
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/* Private data structure. */
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struct metrousb_private {
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spinlock_t lock;
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int throttled;
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unsigned long control_state;
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};
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/* Device table list. */
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static struct usb_device_id id_table[] = {
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{ USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID) },
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{ USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
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{ }, /* Terminating entry. */
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/* Input parameter constants. */
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static bool debug;
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/* ----------------------------------------------------------------------------------------------
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Description:
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Read the port from the read interrupt.
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Input:
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struct urb *: urb structure to get data.
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struct pt_regs *: pt_regs structure.
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Output:
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None:
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*/
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static void metrousb_read_int_callback(struct urb *urb)
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{
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struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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struct tty_struct *tty;
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unsigned char *data = urb->transfer_buffer;
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int throttled = 0;
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int result = 0;
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unsigned long flags = 0;
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dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
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switch (urb->status) {
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case 0:
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/* Success status, read from the port. */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* urb has been terminated. */
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dbg("METRO-USB - %s - urb shutting down, port number=%d, error code=%d",
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__FUNCTION__, port->number, result);
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return;
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default:
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dbg("METRO-USB - %s - non-zero urb received, port number=%d, error code=%d",
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__FUNCTION__, port->number, result);
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goto exit;
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}
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/* Set the data read from the usb port into the serial port buffer. */
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tty = tty_port_tty_get(&port->port);
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if (!tty) {
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dbg("%s - bad tty pointer - exiting", __func__);
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return;
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}
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if (tty && urb->actual_length) {
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/* Loop through the data copying each byte to the tty layer. */
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tty_insert_flip_string(tty, data, urb->actual_length);
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/* Force the data to the tty layer. */
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tty_flip_buffer_push(tty);
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}
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tty_kref_put(tty);
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/* Set any port variables. */
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spin_lock_irqsave(&metro_priv->lock, flags);
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throttled = metro_priv->throttled;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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/* Continue trying to read if set. */
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if (!throttled) {
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usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
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usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress),
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port->interrupt_in_urb->transfer_buffer,
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port->interrupt_in_urb->transfer_buffer_length,
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metrousb_read_int_callback, port, 1);
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result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
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if (result) {
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dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
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__FUNCTION__, port->number, result);
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}
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}
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return;
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exit:
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/* Try to resubmit the urb. */
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result = usb_submit_urb(urb, GFP_ATOMIC);
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if (result) {
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dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
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__FUNCTION__, port->number, result);
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}
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}
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/* ----------------------------------------------------------------------------------------------
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Description:
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Clean up any urbs and port information.
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Input:
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struct usb_serial_port *: pointer to a usb_serial_port structure.
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Output:
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int: Returns true (0) if successful, false otherwise.
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*/
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static void metrousb_cleanup(struct usb_serial_port *port)
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{
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dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
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if (port->serial->dev) {
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/* Shutdown any interrupt in urbs. */
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if (port->interrupt_in_urb) {
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usb_unlink_urb(port->interrupt_in_urb);
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usb_kill_urb(port->interrupt_in_urb);
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}
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}
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}
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/* ----------------------------------------------------------------------------------------------
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Description:
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Open the drivers serial port.
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Input:
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struct usb_serial_port *: pointer to a usb_serial_port structure.
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struct file *: pointer to a file structure.
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Output:
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int: Returns true (0) if successful, false otherwise.
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*/
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static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port)
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{
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struct usb_serial *serial = port->serial;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned long flags = 0;
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int result = 0;
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dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
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/* Make sure the urb is initialized. */
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if (!port->interrupt_in_urb) {
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dbg("METRO-USB - %s - interrupt urb not initialized for port number=%d", __FUNCTION__, port->number);
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return -ENODEV;
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}
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/* Set the private data information for the port. */
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spin_lock_irqsave(&metro_priv->lock, flags);
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metro_priv->control_state = 0;
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metro_priv->throttled = 0;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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/*
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* Force low_latency on so that our tty_push actually forces the data
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* through, otherwise it is scheduled, and with high data rates (like
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* with OHCI) data can get lost.
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*/
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if (tty)
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tty->low_latency = 1;
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/* Clear the urb pipe. */
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usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
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/* Start reading from the device */
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usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
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usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
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port->interrupt_in_urb->transfer_buffer,
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port->interrupt_in_urb->transfer_buffer_length,
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metrousb_read_int_callback, port, 1);
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result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
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if (result) {
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dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d"
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, __FUNCTION__, port->number, result);
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goto exit;
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}
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dbg("METRO-USB - %s - port open for port number=%d", __FUNCTION__, port->number);
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exit:
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return result;
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}
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/* ----------------------------------------------------------------------------------------------
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Description:
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Set the modem control state for the entered serial port.
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Input:
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struct usb_serial_port *: pointer to a usb_serial_port structure.
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unsigned int: control state value to set.
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Output:
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int: Returns true (0) if successful, false otherwise.
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*/
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static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
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{
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int retval = 0;
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unsigned char mcr = METROUSB_MCR_NONE;
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dbg("METRO-USB - %s - control state=%d", __FUNCTION__, control_state);
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/* Set the modem control value. */
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if (control_state & TIOCM_DTR)
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mcr |= METROUSB_MCR_DTR;
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if (control_state & TIOCM_RTS)
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mcr |= METROUSB_MCR_RTS;
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/* Send the command to the usb port. */
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retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
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METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
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control_state, 0, NULL, 0, WDR_TIMEOUT);
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if (retval < 0)
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dbg("METRO-USB - %s - set modem ctrl=0x%x failed, error code=%d", __FUNCTION__, mcr, retval);
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return retval;
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}
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/* ----------------------------------------------------------------------------------------------
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Description:
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Shutdown the driver.
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Input:
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struct usb_serial *: pointer to a usb-serial structure.
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Output:
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int: Returns true (0) if successful, false otherwise.
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*/
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static void metrousb_shutdown(struct usb_serial *serial)
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{
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int i = 0;
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dbg("METRO-USB - %s", __FUNCTION__);
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/* Stop reading and writing on all ports. */
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for (i = 0; i < serial->num_ports; ++i) {
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/* Close any open urbs. */
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metrousb_cleanup(serial->port[i]);
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/* Free memory. */
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kfree(usb_get_serial_port_data(serial->port[i]));
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usb_set_serial_port_data(serial->port[i], NULL);
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dbg("METRO-USB - %s - freed port number=%d", __FUNCTION__, serial->port[i]->number);
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}
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}
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/* ----------------------------------------------------------------------------------------------
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Description:
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Startup the driver.
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Input:
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struct usb_serial *: pointer to a usb-serial structure.
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Output:
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int: Returns true (0) if successful, false otherwise.
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*/
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static int metrousb_startup(struct usb_serial *serial)
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{
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struct metrousb_private *metro_priv;
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struct usb_serial_port *port;
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int i = 0;
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dbg("METRO-USB - %s", __FUNCTION__);
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/* Loop through the serial ports setting up the private structures.
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* Currently we only use one port. */
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for (i = 0; i < serial->num_ports; ++i) {
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port = serial->port[i];
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/* Declare memory. */
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metro_priv = kmalloc(sizeof(struct metrousb_private), GFP_KERNEL);
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if (!metro_priv)
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return -ENOMEM;
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/* Clear memory. */
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memset(metro_priv, 0x00, sizeof(struct metrousb_private));
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/* Initialize memory. */
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spin_lock_init(&metro_priv->lock);
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usb_set_serial_port_data(port, metro_priv);
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dbg("METRO-USB - %s - port number=%d.", __FUNCTION__, port->number);
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}
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return 0;
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}
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/* ----------------------------------------------------------------------------------------------
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Description:
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Set the serial port throttle to stop reading from the port.
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Input:
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struct usb_serial_port *: pointer to a usb_serial_port structure.
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Output:
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None:
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*/
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static void metrousb_throttle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned long flags = 0;
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dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
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/* Set the private information for the port to stop reading data. */
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spin_lock_irqsave(&metro_priv->lock, flags);
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metro_priv->throttled = 1;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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}
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/* ----------------------------------------------------------------------------------------------
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Description:
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Get the serial port control line states.
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Input:
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struct usb_serial_port *: pointer to a usb_serial_port structure.
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struct file *: pointer to a file structure.
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Output:
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int: Returns the state of the control lines.
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*/
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static int metrousb_tiocmget(struct tty_struct *tty)
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{
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unsigned long control_state = 0;
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struct usb_serial_port *port = tty->driver_data;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned long flags = 0;
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dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
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spin_lock_irqsave(&metro_priv->lock, flags);
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control_state = metro_priv->control_state;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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return control_state;
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}
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/* ----------------------------------------------------------------------------------------------
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Description:
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Set the serial port control line states.
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Input:
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struct usb_serial_port *: pointer to a usb_serial_port structure.
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struct file *: pointer to a file structure.
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unsigned int: line state to set.
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unsigned int: line state to clear.
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Output:
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int: Returns the state of the control lines.
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*/
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static int metrousb_tiocmset(struct tty_struct *tty,
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unsigned int set, unsigned int clear)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct usb_serial *serial = port->serial;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned long flags = 0;
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unsigned long control_state = 0;
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dbg("METRO-USB - %s - port number=%d, set=%d, clear=%d", __FUNCTION__, port->number, set, clear);
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spin_lock_irqsave(&metro_priv->lock, flags);
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control_state = metro_priv->control_state;
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/* Set the RTS and DTR values. */
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if (set & TIOCM_RTS)
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control_state |= TIOCM_RTS;
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if (set & TIOCM_DTR)
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control_state |= TIOCM_DTR;
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if (clear & TIOCM_RTS)
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control_state &= ~TIOCM_RTS;
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if (clear & TIOCM_DTR)
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control_state &= ~TIOCM_DTR;
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metro_priv->control_state = control_state;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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return metrousb_set_modem_ctrl(serial, control_state);
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}
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/* ----------------------------------------------------------------------------------------------
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Description:
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Set the serial port unthrottle to resume reading from the port.
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Input:
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struct usb_serial_port *: pointer to a usb_serial_port structure.
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Output:
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None:
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*/
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static void metrousb_unthrottle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned long flags = 0;
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int result = 0;
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dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
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/* Set the private information for the port to resume reading data. */
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spin_lock_irqsave(&metro_priv->lock, flags);
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metro_priv->throttled = 0;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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/* Submit the urb to read from the port. */
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port->interrupt_in_urb->dev = port->serial->dev;
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result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
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if (result) {
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dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
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__FUNCTION__, port->number, result);
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}
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}
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/* Driver structure. */
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static struct usb_driver metrousb_driver = {
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.name = "metro-usb",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table
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};
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/* Device structure. */
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static struct usb_serial_driver metrousb_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "metro-usb",
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},
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.description = "Metrologic USB to serial converter.",
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.id_table = id_table,
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.num_ports = 1,
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.open = metrousb_open,
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.close = metrousb_cleanup,
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.read_int_callback = metrousb_read_int_callback,
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.attach = metrousb_startup,
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.release = metrousb_shutdown,
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.throttle = metrousb_throttle,
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.unthrottle = metrousb_unthrottle,
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.tiocmget = metrousb_tiocmget,
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.tiocmset = metrousb_tiocmset,
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};
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static struct usb_serial_driver * const serial_drivers[] = {
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&metrousb_device,
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NULL,
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};
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module_usb_serial_driver(metrousb_driver, serial_drivers);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Philip Nicastro");
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MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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/* Module input parameters */
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module_param(debug, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Print debug info (bool 1=on, 0=off)");
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