424 lines
11 KiB
C
424 lines
11 KiB
C
/* -*- linux-c -*-
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* Cypress USB Thermometer driver
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*
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* Copyright (c) 2004 Erik Rigtorp <erkki@linux.nu> <erik@rigtorp.com>
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*
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* This driver works with Elektor magazine USB Interface as published in
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* issue #291. It should also work with the original starter kit/demo board
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* from Cypress.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#define DRIVER_VERSION "v1.0"
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#define DRIVER_AUTHOR "Erik Rigtorp"
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#define DRIVER_DESC "Cypress USB Thermometer driver"
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#define USB_SKEL_VENDOR_ID 0x04b4
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#define USB_SKEL_PRODUCT_ID 0x0002
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
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{ }
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};
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MODULE_DEVICE_TABLE (usb, id_table);
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/* Structure to hold all of our device specific stuff */
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struct usb_cytherm {
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struct usb_device *udev; /* save off the usb device pointer */
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struct usb_interface *interface; /* the interface for this device */
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int brightness;
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};
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/* local function prototypes */
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static int cytherm_probe(struct usb_interface *interface,
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const struct usb_device_id *id);
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static void cytherm_disconnect(struct usb_interface *interface);
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/* usb specific object needed to register this driver with the usb subsystem */
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static struct usb_driver cytherm_driver = {
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.name = "cytherm",
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.probe = cytherm_probe,
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.disconnect = cytherm_disconnect,
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.id_table = id_table,
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};
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/* Vendor requests */
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/* They all operate on one byte at a time */
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#define PING 0x00
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#define READ_ROM 0x01 /* Reads form ROM, value = address */
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#define READ_RAM 0x02 /* Reads form RAM, value = address */
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#define WRITE_RAM 0x03 /* Write to RAM, value = address, index = data */
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#define READ_PORT 0x04 /* Reads from port, value = address */
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#define WRITE_PORT 0x05 /* Write to port, value = address, index = data */
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/* Send a vendor command to device */
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static int vendor_command(struct usb_device *dev, unsigned char request,
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unsigned char value, unsigned char index,
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void *buf, int size)
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{
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return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
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request,
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
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value,
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index, buf, size,
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USB_CTRL_GET_TIMEOUT);
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}
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#define BRIGHTNESS 0x2c /* RAM location for brightness value */
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#define BRIGHTNESS_SEM 0x2b /* RAM location for brightness semaphore */
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static ssize_t show_brightness(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_cytherm *cytherm = usb_get_intfdata(intf);
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return sprintf(buf, "%i", cytherm->brightness);
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}
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static ssize_t set_brightness(struct device *dev, struct device_attribute *attr, const char *buf,
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size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_cytherm *cytherm = usb_get_intfdata(intf);
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unsigned char *buffer;
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int retval;
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buffer = kmalloc(8, GFP_KERNEL);
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if (!buffer) {
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dev_err(&cytherm->udev->dev, "out of memory\n");
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return 0;
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}
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cytherm->brightness = simple_strtoul(buf, NULL, 10);
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if (cytherm->brightness > 0xFF)
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cytherm->brightness = 0xFF;
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else if (cytherm->brightness < 0)
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cytherm->brightness = 0;
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/* Set brightness */
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retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS,
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cytherm->brightness, buffer, 8);
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if (retval)
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dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
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/* Inform µC that we have changed the brightness setting */
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retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS_SEM,
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0x01, buffer, 8);
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if (retval)
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dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
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kfree(buffer);
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return count;
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}
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static DEVICE_ATTR(brightness, S_IRUGO | S_IWUSR | S_IWGRP,
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show_brightness, set_brightness);
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#define TEMP 0x33 /* RAM location for temperature */
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#define SIGN 0x34 /* RAM location for temperature sign */
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static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_cytherm *cytherm = usb_get_intfdata(intf);
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int retval;
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unsigned char *buffer;
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int temp, sign;
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buffer = kmalloc(8, GFP_KERNEL);
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if (!buffer) {
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dev_err(&cytherm->udev->dev, "out of memory\n");
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return 0;
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}
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/* read temperature */
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retval = vendor_command(cytherm->udev, READ_RAM, TEMP, 0, buffer, 8);
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if (retval)
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dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
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temp = buffer[1];
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/* read sign */
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retval = vendor_command(cytherm->udev, READ_RAM, SIGN, 0, buffer, 8);
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if (retval)
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dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
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sign = buffer[1];
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kfree(buffer);
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return sprintf(buf, "%c%i.%i", sign ? '-' : '+', temp >> 1,
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5*(temp - ((temp >> 1) << 1)));
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}
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static ssize_t set_temp(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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return count;
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}
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static DEVICE_ATTR(temp, S_IRUGO, show_temp, set_temp);
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#define BUTTON 0x7a
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static ssize_t show_button(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_cytherm *cytherm = usb_get_intfdata(intf);
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int retval;
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unsigned char *buffer;
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buffer = kmalloc(8, GFP_KERNEL);
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if (!buffer) {
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dev_err(&cytherm->udev->dev, "out of memory\n");
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return 0;
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}
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/* check button */
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retval = vendor_command(cytherm->udev, READ_RAM, BUTTON, 0, buffer, 8);
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if (retval)
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dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
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retval = buffer[1];
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kfree(buffer);
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if (retval)
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return sprintf(buf, "1");
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else
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return sprintf(buf, "0");
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}
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static ssize_t set_button(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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return count;
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}
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static DEVICE_ATTR(button, S_IRUGO, show_button, set_button);
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static ssize_t show_port0(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_cytherm *cytherm = usb_get_intfdata(intf);
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int retval;
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unsigned char *buffer;
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buffer = kmalloc(8, GFP_KERNEL);
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if (!buffer) {
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dev_err(&cytherm->udev->dev, "out of memory\n");
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return 0;
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}
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retval = vendor_command(cytherm->udev, READ_PORT, 0, 0, buffer, 8);
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if (retval)
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dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
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retval = buffer[1];
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kfree(buffer);
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return sprintf(buf, "%d", retval);
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}
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static ssize_t set_port0(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_cytherm *cytherm = usb_get_intfdata(intf);
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unsigned char *buffer;
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int retval;
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int tmp;
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buffer = kmalloc(8, GFP_KERNEL);
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if (!buffer) {
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dev_err(&cytherm->udev->dev, "out of memory\n");
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return 0;
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}
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tmp = simple_strtoul(buf, NULL, 10);
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if (tmp > 0xFF)
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tmp = 0xFF;
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else if (tmp < 0)
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tmp = 0;
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retval = vendor_command(cytherm->udev, WRITE_PORT, 0,
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tmp, buffer, 8);
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if (retval)
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dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
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kfree(buffer);
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return count;
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}
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static DEVICE_ATTR(port0, S_IRUGO | S_IWUSR | S_IWGRP, show_port0, set_port0);
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static ssize_t show_port1(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_cytherm *cytherm = usb_get_intfdata(intf);
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int retval;
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unsigned char *buffer;
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buffer = kmalloc(8, GFP_KERNEL);
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if (!buffer) {
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dev_err(&cytherm->udev->dev, "out of memory\n");
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return 0;
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}
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retval = vendor_command(cytherm->udev, READ_PORT, 1, 0, buffer, 8);
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if (retval)
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dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
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retval = buffer[1];
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kfree(buffer);
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return sprintf(buf, "%d", retval);
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}
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static ssize_t set_port1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_cytherm *cytherm = usb_get_intfdata(intf);
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unsigned char *buffer;
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int retval;
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int tmp;
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buffer = kmalloc(8, GFP_KERNEL);
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if (!buffer) {
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dev_err(&cytherm->udev->dev, "out of memory\n");
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return 0;
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}
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tmp = simple_strtoul(buf, NULL, 10);
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if (tmp > 0xFF)
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tmp = 0xFF;
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else if (tmp < 0)
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tmp = 0;
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retval = vendor_command(cytherm->udev, WRITE_PORT, 1,
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tmp, buffer, 8);
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if (retval)
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dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
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kfree(buffer);
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return count;
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}
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static DEVICE_ATTR(port1, S_IRUGO | S_IWUSR | S_IWGRP, show_port1, set_port1);
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static int cytherm_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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struct usb_device *udev = interface_to_usbdev(interface);
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struct usb_cytherm *dev = NULL;
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int retval = -ENOMEM;
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dev = kzalloc (sizeof(struct usb_cytherm), GFP_KERNEL);
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if (dev == NULL) {
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dev_err (&interface->dev, "Out of memory\n");
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goto error_mem;
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}
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dev->udev = usb_get_dev(udev);
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usb_set_intfdata (interface, dev);
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dev->brightness = 0xFF;
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retval = device_create_file(&interface->dev, &dev_attr_brightness);
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if (retval)
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goto error;
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retval = device_create_file(&interface->dev, &dev_attr_temp);
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if (retval)
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goto error;
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retval = device_create_file(&interface->dev, &dev_attr_button);
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if (retval)
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goto error;
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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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dev_info (&interface->dev,
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"Cypress thermometer 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_brightness);
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device_remove_file(&interface->dev, &dev_attr_temp);
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device_remove_file(&interface->dev, &dev_attr_button);
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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 cytherm_disconnect(struct usb_interface *interface)
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{
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struct usb_cytherm *dev;
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dev = usb_get_intfdata (interface);
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device_remove_file(&interface->dev, &dev_attr_brightness);
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device_remove_file(&interface->dev, &dev_attr_temp);
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device_remove_file(&interface->dev, &dev_attr_button);
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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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/* first remove the files, then NULL the pointer */
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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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dev_info(&interface->dev, "Cypress thermometer now disconnected\n");
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}
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module_usb_driver(cytherm_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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