--- /dev/null
+/*
+* cy7c63.c
+*
+* Copyright (c) 2006 Oliver Bock (bock@fh-wolfenbuettel.de)
+*
+* This driver is based on the Cypress Thermometer USB Driver by
+* Marcus Maul and the 2.0 version of Greg Kroah-Hartman's
+* USB Skeleton driver.
+*
+* Is is a generic driver for the Cypress CY7C63000 family.
+* For the time being it enables you to toggle the single I/O ports
+* of the device.
+*
+* Supported vendors: AK Modul-Bus Computer GmbH
+* Supported devices: CY7C63001A-PC (to be continued...)
+* Supported functions: Read/Write Ports (to be continued...)
+*
+* Chipsets families: CY7C63000, CY7C63001, CY7C63100, CY7C63101
+*
+*
+* 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 (bock@fh-wolfenbuettel.de)"
+#define DRIVER_DESC "Cypress CY7C63xxx USB driver"
+
+#define CY7C63_VENDOR_ID 0xa2c
+#define CY7C63_PRODUCT_ID 0x8
+
+#define CY7C63_READ_PORT 0x4
+#define CY7C63_WRITE_PORT 0x5
+#define CY7C63_READ_RAM 0x2
+#define CY7C63_WRITE_RAM 0x3
+#define CY7C63_READ_ROM 0x1
+
+#define CY7C63_READ_PORT_ID0 0
+#define CY7C63_WRITE_PORT_ID0 0
+#define CY7C63_READ_PORT_ID1 0x2
+#define CY7C63_WRITE_PORT_ID1 1
+
+#define CY7C63_MAX_REQSIZE 8
+
+
+/* table of devices that work with this driver */
+static struct usb_device_id cy7c63_table [] = {
+ { USB_DEVICE(CY7C63_VENDOR_ID, CY7C63_PRODUCT_ID) },
+ { }
+};
+MODULE_DEVICE_TABLE(usb, cy7c63_table);
+
+/* structure to hold all of our device specific stuff */
+struct cy7c63 {
+ struct usb_device * udev;
+ char port0;
+ char port1;
+};
+
+/* used to send usb control messages to device */
+int vendor_command(struct cy7c63 *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(CY7C63_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, CY7C63_MAX_REQSIZE,
+ USB_CTRL_GET_TIMEOUT);
+
+ /* store returned data (more READs to be added!) */
+ switch (request) {
+ case CY7C63_READ_PORT:
+ if (address == CY7C63_READ_PORT_ID0) {
+ dev->port0 = iobuf[1];
+ dev_dbg(&dev->udev->dev,
+ "READ_PORT0 returned: %d\n",dev->port0);
+ }
+ else if (address == CY7C63_READ_PORT_ID1) {
+ dev->port1 = iobuf[1];
+ dev_dbg(&dev->udev->dev,
+ "READ_PORT1 returned: %d\n",dev->port1);
+ }
+ break;
+ }
+
+ kfree(iobuf);
+error:
+ return retval;
+}
+
+#define get_set_port(num,read_id,write_id) \
+static ssize_t set_port##num(struct device *dev, struct device_attribute *attr, \
+ const char *buf, size_t count) { \
+ \
+ int value; \
+ int result = 0; \
+ \
+ struct usb_interface *intf = to_usb_interface(dev); \
+ struct cy7c63 *cyp = usb_get_intfdata(intf); \
+ \
+ dev_dbg(&cyp->udev->dev, "WRITE_PORT%d called\n", num); \
+ \
+ /* validate input data */ \
+ if (sscanf(buf, "%d", &value) < 1) { \
+ result = -EINVAL; \
+ goto error; \
+ } \
+ if (value>255 || value<0) { \
+ result = -EINVAL; \
+ goto error; \
+ } \
+ \
+ result = vendor_command(cyp, CY7C63_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; \
+} \
+ \
+static ssize_t get_port##num(struct device *dev, \
+ struct device_attribute *attr, char *buf) { \
+ \
+ int result = 0; \
+ \
+ struct usb_interface *intf = to_usb_interface(dev); \
+ struct cy7c63 *cyp = usb_get_intfdata(intf); \
+ \
+ dev_dbg(&cyp->udev->dev, "READ_PORT%d called\n", num); \
+ \
+ result = vendor_command(cyp, CY7C63_READ_PORT, read_id, 0); \
+ \
+ dev_dbg(&cyp->udev->dev, "Result of vendor_command: %d\n\n", result); \
+ \
+ return sprintf(buf, "%d", cyp->port##num); \
+} \
+static DEVICE_ATTR(port##num, S_IWUGO | S_IRUGO, get_port##num, set_port##num);
+
+get_set_port(0, CY7C63_READ_PORT_ID0, CY7C63_WRITE_PORT_ID0);
+get_set_port(1, CY7C63_READ_PORT_ID1, CY7C63_WRITE_PORT_ID1);
+
+static int cy7c63_probe(struct usb_interface *interface,
+ const struct usb_device_id *id) {
+
+ struct cy7c63 *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(&dev->udev->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 what node this device is now attached to */
+ dev_info(&interface->dev,
+ "Cypress CY7C63xxx device now attached\n");
+
+ retval = 0;
+error:
+ return retval;
+}
+
+static void cy7c63_disconnect(struct usb_interface *interface) {
+
+ struct cy7c63 *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 cy7c63_driver = {
+ .name = "cy7c63",
+ .probe = cy7c63_probe,
+ .disconnect = cy7c63_disconnect,
+ .id_table = cy7c63_table,
+};
+
+static int __init cy7c63_init(void) {
+
+ int result;
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&cy7c63_driver);
+ if (result) {
+ err("Function usb_register failed! Error number: %d\n", result);
+ }
+
+ return result;
+}
+
+static void __exit cy7c63_exit(void) {
+
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&cy7c63_driver);
+}
+
+module_init(cy7c63_init);
+module_exit(cy7c63_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+
+MODULE_LICENSE("GPL");
projects / linux-2.6-omap-h63xx.git / commitdiff