--- /dev/null
+/* -*- linux-c -*-
+ * Cypress USB Thermometer driver
+ *
+ * Copyright (c) 2004 Erik Rigtorp <erkki@linux.nu> <erik@rigtorp.com>
+ *
+ * This driver works with Elektor magazine USB Interface as published in
+ * issue #291. It should also work with the original starter kit/demo board
+ * from Cypress.
+ *
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+
+#define DRIVER_VERSION "v1.0"
+#define DRIVER_AUTHOR "Erik Rigtorp"
+#define DRIVER_DESC "Cypress USB Thermometer driver"
+
+#define USB_SKEL_VENDOR_ID 0x04b4
+#define USB_SKEL_PRODUCT_ID 0x0002
+
+static const struct usb_device_id id_table[] = {
+ { USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
+ { }
+};
+MODULE_DEVICE_TABLE (usb, id_table);
+
+/* Structure to hold all of our device specific stuff */
+struct usb_cytherm {
+ struct usb_device *udev; /* save off the usb device pointer */
+ struct usb_interface *interface; /* the interface for this device */
+ int brightness;
+};
+
+
+/* local function prototypes */
+static int cytherm_probe(struct usb_interface *interface,
+ const struct usb_device_id *id);
+static void cytherm_disconnect(struct usb_interface *interface);
+
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver cytherm_driver = {
+ .name = "cytherm",
+ .probe = cytherm_probe,
+ .disconnect = cytherm_disconnect,
+ .id_table = id_table,
+};
+
+/* Vendor requests */
+/* They all operate on one byte at a time */
+#define PING 0x00
+#define READ_ROM 0x01 /* Reads form ROM, value = address */
+#define READ_RAM 0x02 /* Reads form RAM, value = address */
+#define WRITE_RAM 0x03 /* Write to RAM, value = address, index = data */
+#define READ_PORT 0x04 /* Reads from port, value = address */
+#define WRITE_PORT 0x05 /* Write to port, value = address, index = data */
+
+
+/* Send a vendor command to device */
+static int vendor_command(struct usb_device *dev, unsigned char request,
+ unsigned char value, unsigned char index,
+ void *buf, int size)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ request,
+ USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
+ value,
+ index, buf, size,
+ USB_CTRL_GET_TIMEOUT);
+}
+
+
+
+#define BRIGHTNESS 0x2c /* RAM location for brightness value */
+#define BRIGHTNESS_SEM 0x2b /* RAM location for brightness semaphore */
+
+static ssize_t show_brightness(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_cytherm *cytherm = usb_get_intfdata(intf);
+
+ return sprintf(buf, "%i", cytherm->brightness);
+}
+
+static ssize_t set_brightness(struct device *dev, struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_cytherm *cytherm = usb_get_intfdata(intf);
+
+ unsigned char *buffer;
+ int retval;
+
+ buffer = kmalloc(8, GFP_KERNEL);
+ if (!buffer) {
+ dev_err(&cytherm->udev->dev, "out of memory\n");
+ return 0;
+ }
+
+ cytherm->brightness = simple_strtoul(buf, NULL, 10);
+
+ if (cytherm->brightness > 0xFF)
+ cytherm->brightness = 0xFF;
+ else if (cytherm->brightness < 0)
+ cytherm->brightness = 0;
+
+ /* Set brightness */
+ retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS,
+ cytherm->brightness, buffer, 8);
+ if (retval)
+ dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+ /* Inform µC that we have changed the brightness setting */
+ retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS_SEM,
+ 0x01, buffer, 8);
+ if (retval)
+ dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+
+ kfree(buffer);
+
+ return count;
+}
+
+static DEVICE_ATTR(brightness, S_IRUGO | S_IWUSR | S_IWGRP,
+ show_brightness, set_brightness);
+
+
+#define TEMP 0x33 /* RAM location for temperature */
+#define SIGN 0x34 /* RAM location for temperature sign */
+
+static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf)
+{
+
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_cytherm *cytherm = usb_get_intfdata(intf);
+
+ int retval;
+ unsigned char *buffer;
+
+ int temp, sign;
+
+ buffer = kmalloc(8, GFP_KERNEL);
+ if (!buffer) {
+ dev_err(&cytherm->udev->dev, "out of memory\n");
+ return 0;
+ }
+
+ /* read temperature */
+ retval = vendor_command(cytherm->udev, READ_RAM, TEMP, 0, buffer, 8);
+ if (retval)
+ dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+ temp = buffer[1];
+
+ /* read sign */
+ retval = vendor_command(cytherm->udev, READ_RAM, SIGN, 0, buffer, 8);
+ if (retval)
+ dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+ sign = buffer[1];
+
+ kfree(buffer);
+
+ return sprintf(buf, "%c%i.%i", sign ? '-' : '+', temp >> 1,
+ 5*(temp - ((temp >> 1) << 1)));
+}
+
+
+static ssize_t set_temp(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+ return count;
+}
+
+static DEVICE_ATTR(temp, S_IRUGO, show_temp, set_temp);
+
+
+#define BUTTON 0x7a
+
+static ssize_t show_button(struct device *dev, struct device_attribute *attr, char *buf)
+{
+
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_cytherm *cytherm = usb_get_intfdata(intf);
+
+ int retval;
+ unsigned char *buffer;
+
+ buffer = kmalloc(8, GFP_KERNEL);
+ if (!buffer) {
+ dev_err(&cytherm->udev->dev, "out of memory\n");
+ return 0;
+ }
+
+ /* check button */
+ retval = vendor_command(cytherm->udev, READ_RAM, BUTTON, 0, buffer, 8);
+ if (retval)
+ dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+
+ retval = buffer[1];
+
+ kfree(buffer);
+
+ if (retval)
+ return sprintf(buf, "1");
+ else
+ return sprintf(buf, "0");
+}
+
+
+static ssize_t set_button(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+ return count;
+}
+
+static DEVICE_ATTR(button, S_IRUGO, show_button, set_button);
+
+
+static ssize_t show_port0(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_cytherm *cytherm = usb_get_intfdata(intf);
+
+ int retval;
+ unsigned char *buffer;
+
+ buffer = kmalloc(8, GFP_KERNEL);
+ if (!buffer) {
+ dev_err(&cytherm->udev->dev, "out of memory\n");
+ return 0;
+ }
+
+ retval = vendor_command(cytherm->udev, READ_PORT, 0, 0, buffer, 8);
+ if (retval)
+ dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+
+ retval = buffer[1];
+
+ kfree(buffer);
+
+ return sprintf(buf, "%d", retval);
+}
+
+
+static ssize_t set_port0(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_cytherm *cytherm = usb_get_intfdata(intf);
+
+ unsigned char *buffer;
+ int retval;
+ int tmp;
+
+ buffer = kmalloc(8, GFP_KERNEL);
+ if (!buffer) {
+ dev_err(&cytherm->udev->dev, "out of memory\n");
+ return 0;
+ }
+
+ tmp = simple_strtoul(buf, NULL, 10);
+
+ if (tmp > 0xFF)
+ tmp = 0xFF;
+ else if (tmp < 0)
+ tmp = 0;
+
+ retval = vendor_command(cytherm->udev, WRITE_PORT, 0,
+ tmp, buffer, 8);
+ if (retval)
+ dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+
+ kfree(buffer);
+
+ return count;
+}
+
+static DEVICE_ATTR(port0, S_IRUGO | S_IWUSR | S_IWGRP, show_port0, set_port0);
+
+static ssize_t show_port1(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_cytherm *cytherm = usb_get_intfdata(intf);
+
+ int retval;
+ unsigned char *buffer;
+
+ buffer = kmalloc(8, GFP_KERNEL);
+ if (!buffer) {
+ dev_err(&cytherm->udev->dev, "out of memory\n");
+ return 0;
+ }
+
+ retval = vendor_command(cytherm->udev, READ_PORT, 1, 0, buffer, 8);
+ if (retval)
+ dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+
+ retval = buffer[1];
+
+ kfree(buffer);
+
+ return sprintf(buf, "%d", retval);
+}
+
+
+static ssize_t set_port1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_cytherm *cytherm = usb_get_intfdata(intf);
+
+ unsigned char *buffer;
+ int retval;
+ int tmp;
+
+ buffer = kmalloc(8, GFP_KERNEL);
+ if (!buffer) {
+ dev_err(&cytherm->udev->dev, "out of memory\n");
+ return 0;
+ }
+
+ tmp = simple_strtoul(buf, NULL, 10);
+
+ if (tmp > 0xFF)
+ tmp = 0xFF;
+ else if (tmp < 0)
+ tmp = 0;
+
+ retval = vendor_command(cytherm->udev, WRITE_PORT, 1,
+ tmp, buffer, 8);
+ if (retval)
+ dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+
+ kfree(buffer);
+
+ return count;
+}
+
+static DEVICE_ATTR(port1, S_IRUGO | S_IWUSR | S_IWGRP, show_port1, set_port1);
+
+
+
+static int cytherm_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct usb_device *udev = interface_to_usbdev(interface);
+ struct usb_cytherm *dev = NULL;
+ int retval = -ENOMEM;
+
+ dev = kzalloc (sizeof(struct usb_cytherm), GFP_KERNEL);
+ if (dev == NULL) {
+ dev_err (&interface->dev, "Out of memory\n");
+ goto error_mem;
+ }
+
+ dev->udev = usb_get_dev(udev);
+
+ usb_set_intfdata (interface, dev);
+
+ dev->brightness = 0xFF;
+
+ retval = device_create_file(&interface->dev, &dev_attr_brightness);
+ if (retval)
+ goto error;
+ retval = device_create_file(&interface->dev, &dev_attr_temp);
+ if (retval)
+ goto error;
+ retval = device_create_file(&interface->dev, &dev_attr_button);
+ if (retval)
+ goto error;
+ retval = device_create_file(&interface->dev, &dev_attr_port0);
+ if (retval)
+ goto error;
+ retval = device_create_file(&interface->dev, &dev_attr_port1);
+ if (retval)
+ goto error;
+
+ dev_info (&interface->dev,
+ "Cypress thermometer device now attached\n");
+ return 0;
+error:
+ device_remove_file(&interface->dev, &dev_attr_brightness);
+ device_remove_file(&interface->dev, &dev_attr_temp);
+ device_remove_file(&interface->dev, &dev_attr_button);
+ device_remove_file(&interface->dev, &dev_attr_port0);
+ device_remove_file(&interface->dev, &dev_attr_port1);
+ usb_set_intfdata (interface, NULL);
+ usb_put_dev(dev->udev);
+ kfree(dev);
+error_mem:
+ return retval;
+}
+
+static void cytherm_disconnect(struct usb_interface *interface)
+{
+ struct usb_cytherm *dev;
+
+ dev = usb_get_intfdata (interface);
+
+ device_remove_file(&interface->dev, &dev_attr_brightness);
+ device_remove_file(&interface->dev, &dev_attr_temp);
+ device_remove_file(&interface->dev, &dev_attr_button);
+ device_remove_file(&interface->dev, &dev_attr_port0);
+ device_remove_file(&interface->dev, &dev_attr_port1);
+
+ /* first remove the files, then NULL the pointer */
+ usb_set_intfdata (interface, NULL);
+
+ usb_put_dev(dev->udev);
+
+ kfree(dev);
+
+ dev_info(&interface->dev, "Cypress thermometer now disconnected\n");
+}
+
+module_usb_driver(cytherm_driver);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff