![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Keith Packard <keithp@keithp.com> Cc: Juergen Stuber <starblue@users.sourceforge.net> Cc: Cesar Miquel <miquel@df.uba.ar> Cc: Richard Leitner <richard.leitner@skidata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
273 lines
6.8 KiB
C
273 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* cypress_cy7c63.c
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*
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* Copyright (c) 2006-2007 Oliver Bock (bock@tfh-berlin.de)
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*
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* This driver is based on the Cypress USB Driver by Marcus Maul
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* (cyport) and the 2.0 version of Greg Kroah-Hartman's
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* USB Skeleton driver.
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*
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* This is a generic driver for the Cypress CY7C63xxx family.
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* For the time being it enables you to read from and write to
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* the single I/O ports of the device.
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*
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* Supported vendors: AK Modul-Bus Computer GmbH
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* (Firmware "Port-Chip")
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*
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* Supported devices: CY7C63001A-PC
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* CY7C63001C-PXC
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* CY7C63001C-SXC
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*
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* Supported functions: Read/Write Ports
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*
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*
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* For up-to-date information please visit:
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* http://www.obock.de/kernel/cypress
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#define DRIVER_AUTHOR "Oliver Bock (bock@tfh-berlin.de)"
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#define DRIVER_DESC "Cypress CY7C63xxx USB driver"
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#define CYPRESS_VENDOR_ID 0xa2c
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#define CYPRESS_PRODUCT_ID 0x8
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#define CYPRESS_READ_PORT 0x4
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#define CYPRESS_WRITE_PORT 0x5
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#define CYPRESS_READ_RAM 0x2
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#define CYPRESS_WRITE_RAM 0x3
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#define CYPRESS_READ_ROM 0x1
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#define CYPRESS_READ_PORT_ID0 0
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#define CYPRESS_WRITE_PORT_ID0 0
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#define CYPRESS_READ_PORT_ID1 0x2
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#define CYPRESS_WRITE_PORT_ID1 1
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#define CYPRESS_MAX_REQSIZE 8
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/* table of devices that work with this driver */
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static const struct usb_device_id cypress_table[] = {
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{ USB_DEVICE(CYPRESS_VENDOR_ID, CYPRESS_PRODUCT_ID) },
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{ }
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};
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MODULE_DEVICE_TABLE(usb, cypress_table);
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/* structure to hold all of our device specific stuff */
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struct cypress {
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struct usb_device * udev;
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unsigned char port[2];
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};
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/* used to send usb control messages to device */
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static int vendor_command(struct cypress *dev, unsigned char request,
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unsigned char address, unsigned char data)
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{
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int retval = 0;
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unsigned int pipe;
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unsigned char *iobuf;
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/* allocate some memory for the i/o buffer*/
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iobuf = kzalloc(CYPRESS_MAX_REQSIZE, GFP_KERNEL);
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if (!iobuf) {
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retval = -ENOMEM;
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goto error;
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}
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dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data);
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/* prepare usb control message and send it upstream */
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pipe = usb_rcvctrlpipe(dev->udev, 0);
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retval = usb_control_msg(dev->udev, pipe, request,
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
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address, data, iobuf, CYPRESS_MAX_REQSIZE,
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USB_CTRL_GET_TIMEOUT);
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/* store returned data (more READs to be added) */
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switch (request) {
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case CYPRESS_READ_PORT:
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if (address == CYPRESS_READ_PORT_ID0) {
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dev->port[0] = iobuf[1];
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dev_dbg(&dev->udev->dev,
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"READ_PORT0 returned: %d\n",
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dev->port[0]);
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}
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else if (address == CYPRESS_READ_PORT_ID1) {
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dev->port[1] = iobuf[1];
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dev_dbg(&dev->udev->dev,
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"READ_PORT1 returned: %d\n",
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dev->port[1]);
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}
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break;
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}
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kfree(iobuf);
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error:
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return retval;
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}
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/* write port value */
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static ssize_t write_port(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count,
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int port_num, int write_id)
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{
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int value = -1;
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int result = 0;
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struct usb_interface *intf = to_usb_interface(dev);
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struct cypress *cyp = usb_get_intfdata(intf);
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dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", port_num);
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/* validate input data */
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if (sscanf(buf, "%d", &value) < 1) {
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result = -EINVAL;
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goto error;
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}
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if (value < 0 || value > 255) {
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result = -EINVAL;
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goto error;
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}
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result = vendor_command(cyp, CYPRESS_WRITE_PORT, write_id,
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(unsigned char)value);
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dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
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error:
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return result < 0 ? result : count;
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}
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/* attribute callback handler (write) */
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static ssize_t set_port0_handler(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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return write_port(dev, attr, buf, count, 0, CYPRESS_WRITE_PORT_ID0);
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}
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/* attribute callback handler (write) */
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static ssize_t set_port1_handler(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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return write_port(dev, attr, buf, count, 1, CYPRESS_WRITE_PORT_ID1);
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}
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/* read port value */
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static ssize_t read_port(struct device *dev, struct device_attribute *attr,
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char *buf, int port_num, int read_id)
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{
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int result = 0;
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struct usb_interface *intf = to_usb_interface(dev);
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struct cypress *cyp = usb_get_intfdata(intf);
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dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", port_num);
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result = vendor_command(cyp, CYPRESS_READ_PORT, read_id, 0);
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dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
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return sprintf(buf, "%d", cyp->port[port_num]);
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}
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/* attribute callback handler (read) */
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static ssize_t get_port0_handler(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return read_port(dev, attr, buf, 0, CYPRESS_READ_PORT_ID0);
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}
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/* attribute callback handler (read) */
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static ssize_t get_port1_handler(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return read_port(dev, attr, buf, 1, CYPRESS_READ_PORT_ID1);
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}
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static DEVICE_ATTR(port0, S_IRUGO | S_IWUSR, get_port0_handler, set_port0_handler);
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static DEVICE_ATTR(port1, S_IRUGO | S_IWUSR, get_port1_handler, set_port1_handler);
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static int cypress_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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struct cypress *dev = NULL;
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int retval = -ENOMEM;
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/* allocate memory for our device state and initialize it */
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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goto error_mem;
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dev->udev = usb_get_dev(interface_to_usbdev(interface));
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/* save our data pointer in this interface device */
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usb_set_intfdata(interface, dev);
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/* create device attribute files */
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retval = device_create_file(&interface->dev, &dev_attr_port0);
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if (retval)
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goto error;
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retval = device_create_file(&interface->dev, &dev_attr_port1);
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if (retval)
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goto error;
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/* let the user know that the device is now attached */
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dev_info(&interface->dev,
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"Cypress CY7C63xxx device now attached\n");
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return 0;
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error:
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device_remove_file(&interface->dev, &dev_attr_port0);
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device_remove_file(&interface->dev, &dev_attr_port1);
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usb_set_intfdata(interface, NULL);
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usb_put_dev(dev->udev);
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kfree(dev);
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error_mem:
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return retval;
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}
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static void cypress_disconnect(struct usb_interface *interface)
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{
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struct cypress *dev;
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dev = usb_get_intfdata(interface);
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/* remove device attribute files */
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device_remove_file(&interface->dev, &dev_attr_port0);
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device_remove_file(&interface->dev, &dev_attr_port1);
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/* the intfdata can be set to NULL only after the
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* device files have been removed */
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usb_set_intfdata(interface, NULL);
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usb_put_dev(dev->udev);
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dev_info(&interface->dev,
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"Cypress CY7C63xxx device now disconnected\n");
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kfree(dev);
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}
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static struct usb_driver cypress_driver = {
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.name = "cypress_cy7c63",
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.probe = cypress_probe,
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.disconnect = cypress_disconnect,
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.id_table = cypress_table,
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};
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module_usb_driver(cypress_driver);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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