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Subject[PATCH 1/1] usb: new driver for Cypress CY7C63xxx mirco controllers
Date
From: Oliver Bock <o.bock@fh-wolfenbuettel.de>

This is a new driver for the Cypress CY7C63xxx mirco controller series. It
currently supports the pre-programmed CYC63001A-PC by AK Modul-Bus GmbH.
It's based on a kernel 2.4 driver (cyport) by Marcus Maul which I ported to kernel 2.6
using sysfs. I intend to support more controllers of this family (and more features) as
soon as I get hold of the required IDs etc. Please see the source code's header for
more information.

Signed-off-by: Oliver Bock <o.bock@fh-wolfenbuettel.de>

---

Please CC me as I'm not yet subscribed to LKML. Any comments are welcome.
Special thanks to Greg K-H for his helpful support!

diff against 2.6.16.19

--- linux-2.6.16.19/drivers/usb/Makefile.orig   2006-05-31 02:31:44.000000000 +0200
+++ linux-2.6.16.19/drivers/usb/Makefile        2006-06-04 21:03:24.000000000 +0200
@@ -62,6 +62,7 @@ obj-$(CONFIG_USB_MICROTEK)    += image/
 obj-$(CONFIG_USB_SERIAL)       += serial/
 
 obj-$(CONFIG_USB_AUERSWALD)    += misc/
+obj-$(CONFIG_USB_CY7C63)       += misc/
 obj-$(CONFIG_USB_CYTHERM)      += misc/
 obj-$(CONFIG_USB_EMI26)                += misc/
 obj-$(CONFIG_USB_EMI62)                += misc/
--- linux-2.6.16.19/drivers/usb/misc/Kconfig.orig       2006-05-31 02:31:44.000000000 +0200
+++ linux-2.6.16.19/drivers/usb/misc/Kconfig    2006-06-04 21:02:21.000000000 +0200
@@ -88,6 +88,20 @@ config USB_LED
          To compile this driver as a module, choose M here: the
          module will be called usbled.
 
+config USB_CY7C63
+       tristate "Cypress CY7C63xxx USB driver support"
+       depends on USB
+       help
+         Say Y here if you want to connect a Cypress CY7C63xxx
+         micro controller to your computer's USB port. This driver
+         supports the pre-programmed devices (incl. firmware) by
+         AK Modul-Bus Computer GmbH.
+
+         Please see: http://www.ak-modul-bus.de/stat/mikrocontroller.html
+
+         To compile this driver as a module, choose M here: the
+         module will be called cy7c63.
+
 config USB_CYTHERM
        tristate "Cypress USB thermometer driver support"
        depends on USB
--- linux-2.6.16.19/drivers/usb/misc/Makefile.orig      2006-05-31 02:31:44.000000000 +0200
+++ linux-2.6.16.19/drivers/usb/misc/Makefile   2006-06-04 21:02:52.000000000 +0200
@@ -4,6 +4,7 @@
 #
 
 obj-$(CONFIG_USB_AUERSWALD)    += auerswald.o
+obj-$(CONFIG_USB_CY7C63)       += cy7c63.o
 obj-$(CONFIG_USB_CYTHERM)      += cytherm.o
 obj-$(CONFIG_USB_EMI26)                += emi26.o
 obj-$(CONFIG_USB_EMI62)                += emi62.o
--- linux-2.6.16.19/drivers/usb/misc/cy7c63.c.orig      1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.16.19/drivers/usb/misc/cy7c63.c   2006-06-04 23:45:54.000000000 +0200
@@ -0,0 +1,244 @@
+/*
+* 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");[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2006-06-08 22:59    [W:0.048 / U:14.328 seconds]
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