--- /dev/null
+/*
+* cypress_cy7c63.c
+*
+* Copyright (c) 2006 Oliver Bock (o.bock@fh-wolfenbuettel.de)
+*
+* This driver is based on the Cypress USB Driver by Marcus Maul
+* (cyport) and the 2.0 version of Greg Kroah-Hartman's
+* USB Skeleton driver.
+*
+* This is a generic driver for the Cypress CY7C63xxx family.
+* For the time being it enables you to read from and write to
+* the single I/O ports of the device.
+*
+* Supported vendors: AK Modul-Bus Computer GmbH
+* (Firmware "Port-Chip")
+*
+* Supported devices: CY7C63001A-PC
+* CY7C63001C-PXC
+* CY7C63001C-SXC
+*
+* Supported functions: Read/Write Ports
+*
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License as
+* published by the Free Software Foundation, version 2.
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/usb.h>
+
+#define DRIVER_AUTHOR "Oliver Bock (o.bock@fh-wolfenbuettel.de)"
+#define DRIVER_DESC "Cypress CY7C63xxx USB driver"
+
+#define CYPRESS_VENDOR_ID 0xa2c
+#define CYPRESS_PRODUCT_ID 0x8
+
+#define CYPRESS_READ_PORT 0x4
+#define CYPRESS_WRITE_PORT 0x5
+
+#define CYPRESS_READ_RAM 0x2
+#define CYPRESS_WRITE_RAM 0x3
+#define CYPRESS_READ_ROM 0x1
+
+#define CYPRESS_READ_PORT_ID0 0
+#define CYPRESS_WRITE_PORT_ID0 0
+#define CYPRESS_READ_PORT_ID1 0x2
+#define CYPRESS_WRITE_PORT_ID1 1
+
+#define CYPRESS_MAX_REQSIZE 8
+
+
+/* table of devices that work with this driver */
+static struct usb_device_id cypress_table [] = {
+ { USB_DEVICE(CYPRESS_VENDOR_ID, CYPRESS_PRODUCT_ID) },
+ { }
+};
+MODULE_DEVICE_TABLE(usb, cypress_table);
+
+/* structure to hold all of our device specific stuff */
+struct cypress {
+ struct usb_device * udev;
+ unsigned char port[2];
+};
+
+/* used to send usb control messages to device */
+static int vendor_command(struct cypress *dev, unsigned char request,
+ unsigned char address, unsigned char data)
+{
+ int retval = 0;
+ unsigned int pipe;
+ unsigned char *iobuf;
+
+ /* allocate some memory for the i/o buffer*/
+ iobuf = kzalloc(CYPRESS_MAX_REQSIZE, GFP_KERNEL);
+ if (!iobuf) {
+ dev_err(&dev->udev->dev, "Out of memory!\n");
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data);
+
+ /* prepare usb control message and send it upstream */
+ pipe = usb_rcvctrlpipe(dev->udev, 0);
+ retval = usb_control_msg(dev->udev, pipe, request,
+ USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
+ address, data, iobuf, CYPRESS_MAX_REQSIZE,
+ USB_CTRL_GET_TIMEOUT);
+
+ /* store returned data (more READs to be added) */
+ switch (request) {
+ case CYPRESS_READ_PORT:
+ if (address == CYPRESS_READ_PORT_ID0) {
+ dev->port[0] = iobuf[1];
+ dev_dbg(&dev->udev->dev,
+ "READ_PORT0 returned: %d\n",
+ dev->port[0]);
+ }
+ else if (address == CYPRESS_READ_PORT_ID1) {
+ dev->port[1] = iobuf[1];
+ dev_dbg(&dev->udev->dev,
+ "READ_PORT1 returned: %d\n",
+ dev->port[1]);
+ }
+ break;
+ }
+
+ kfree(iobuf);
+error:
+ return retval;
+}
+
+/* write port value */
+static ssize_t write_port(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count,
+ int port_num, int write_id)
+{
+ int value = -1;
+ int result = 0;
+
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct cypress *cyp = usb_get_intfdata(intf);
+
+ dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", port_num);
+
+ /* validate input data */
+ if (sscanf(buf, "%d", &value) < 1) {
+ result = -EINVAL;
+ goto error;
+ }
+ if (value < 0 || value > 255) {
+ result = -EINVAL;
+ goto error;
+ }
+
+ result = vendor_command(cyp, CYPRESS_WRITE_PORT, write_id,
+ (unsigned char)value);
+
+ dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
+error:
+ return result < 0 ? result : count;
+}
+
+/* attribute callback handler (write) */
+static ssize_t set_port0_handler(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ return write_port(dev, attr, buf, count, 0, CYPRESS_WRITE_PORT_ID0);
+}
+
+/* attribute callback handler (write) */
+static ssize_t set_port1_handler(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ return write_port(dev, attr, buf, count, 1, CYPRESS_WRITE_PORT_ID1);
+}
+
+/* read port value */
+static ssize_t read_port(struct device *dev, struct device_attribute *attr,
+ char *buf, int port_num, int read_id)
+{
+ int result = 0;
+
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct cypress *cyp = usb_get_intfdata(intf);
+
+ dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", port_num);
+
+ result = vendor_command(cyp, CYPRESS_READ_PORT, read_id, 0);
+
+ dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result);
+
+ return sprintf(buf, "%d", cyp->port[port_num]);
+}
+
+/* attribute callback handler (read) */
+static ssize_t get_port0_handler(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return read_port(dev, attr, buf, 0, CYPRESS_READ_PORT_ID0);
+}
+
+/* attribute callback handler (read) */
+static ssize_t get_port1_handler(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return read_port(dev, attr, buf, 1, CYPRESS_READ_PORT_ID1);
+}
+
+static DEVICE_ATTR(port0, S_IWUGO | S_IRUGO,
+ get_port0_handler, set_port0_handler);
+
+static DEVICE_ATTR(port1, S_IWUGO | S_IRUGO,
+ get_port1_handler, set_port1_handler);
+
+
+static int cypress_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct cypress *dev = NULL;
+ int retval = -ENOMEM;
+
+ /* allocate memory for our device state and initialize it */
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (dev == NULL) {
+ dev_err(&interface->dev, "Out of memory!\n");
+ goto error;
+ }
+
+ dev->udev = usb_get_dev(interface_to_usbdev(interface));
+
+ /* save our data pointer in this interface device */
+ usb_set_intfdata(interface, dev);
+
+ /* create device attribute files */
+ device_create_file(&interface->dev, &dev_attr_port0);
+ device_create_file(&interface->dev, &dev_attr_port1);
+
+ /* let the user know that the device is now attached */
+ dev_info(&interface->dev,
+ "Cypress CY7C63xxx device now attached\n");
+
+ retval = 0;
+error:
+ return retval;
+}
+
+static void cypress_disconnect(struct usb_interface *interface)
+{
+ struct cypress *dev;
+
+ dev = usb_get_intfdata(interface);
+ usb_set_intfdata(interface, NULL);
+
+ /* remove device attribute files */
+ device_remove_file(&interface->dev, &dev_attr_port0);
+ device_remove_file(&interface->dev, &dev_attr_port1);
+
+ usb_put_dev(dev->udev);
+
+ dev_info(&interface->dev,
+ "Cypress CY7C63xxx device now disconnected\n");
+
+ kfree(dev);
+}
+
+static struct usb_driver cypress_driver = {
+ .name = "cypress_cy7c63",
+ .probe = cypress_probe,
+ .disconnect = cypress_disconnect,
+ .id_table = cypress_table,
+};
+
+static int __init cypress_init(void)
+{
+ int result;
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&cypress_driver);
+ if (result) {
+ err("Function usb_register failed! Error number: %d\n", result);
+ }
+
+ return result;
+}
+
+static void __exit cypress_exit(void)
+{
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&cypress_driver);
+}
+
+module_init(cypress_init);
+module_exit(cypress_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+
+MODULE_LICENSE("GPL");
git://git.onelab.eu / linux-2.6.git / blobdiff