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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Instead of "open coding" a DEVICE_ATTR() define, use the DEVICE_ATTR_RW() macro instead, which does everything properly instead. This does require a few static functions to be renamed to work properly, but thanks to a script from Joe Perches, this was easily done. Reported-by: Joe Perches <joe@perches.com> Cc: Matthieu CASTET <castet.matthieu@free.fr> Cc: Stanislaw Gruszka <stf_xl@wp.pl> Cc: Peter Chen <Peter.Chen@nxp.com> Cc: Mathias Nyman <mathias.nyman@intel.com> Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Bin Liu <b-liu@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
272 lines
6.7 KiB
C
272 lines
6.7 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 port0_store(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 port1_store(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 port0_show(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 port1_show(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_RW(port0);
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static DEVICE_ATTR_RW(port1);
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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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