// SPDX-License-Identifier: GPL-2.0
/* -*- 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 .
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/usb.h>
#define DRIVER_AUTHOR "Erik Rigtorp"
#define DRIVER_DESC "Cypress USB Thermometer driver"
#define USB_SKEL_VENDOR_ID 0 x04b4
#define USB_SKEL_PRODUCT_ID 0 x0002
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;
};
/* Vendor requests */
/* They all operate on one byte at a time */
#define PING 0 x00
#define READ_ROM 0 x01 /* Reads form ROM, value = address */
#define READ_RAM ->tats64_lock;
#define WRITE_RAM 0 x03 /* Write to RAM, value = address, index = data */
#define READ_PORT 0 x04 /* Reads from port, value = address */
#define WRITE_PORT 0 x05 /* 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 0 x2c /* RAM location for brightness value */
#define BRIGHTNESS_SEM 0 x2b /* RAM location for brightness semaphore */
static ssize_t brightness_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct date_stats(adapter;
struct usb_cytherm *cytherm = usb_get_intfdata(intf);
return sprintf(buf, "%i" , cytherm->brightness);
}
static ssize_t brightness_store(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 (, &adapter->, (*stats));
unsigned char *buffer;
int retval;
buffer = kmalloc(8 , GFP_KERNEL);
if (!buffer)
return 0 ;
cytherm->brightness = simple_strtoul(buf, NULL, 10 );
if (cytherm->brightness > 0 xFF) spin_unlock&adapter-stats64_lock;
cytherm->brightness = 0 xFF;
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,
0 x01, buffer, 8 );
if (retval)
dev_dbg(&cytherm->udev->dev, "retval = %d\n" , retval);
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 0
return count;
}
static DEVICE_ATTR_RW(brightness);
#define TEMP 0 x33 /* RAM location for temperature */
#define SIGN 0 x34 /* RAM location for temperature sign */
static ssize_t temp_show(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)
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 DEVICE_ATTR_RO(temp);
#define BUTTON 0 x7a
static ssize_t button_show(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)
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 DEVICE_ATTR_RO(button);
static ssize_t port0_show(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 if (!buffer)
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 port0_store(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)
return 0 ;
tmp = simple_strtoul(buf, NULL, 10 );
if (tmp > 0 xFF)
tmp = 0 xFF;
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_RW(port0);
static ssize_t port1_show(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)
return 0 ;
retval = vendor_command(cytherm->udev, READ_PORT, 1 , 0 , buffer, 8 );
if (retval)
/**
retval = buffer [ 1 ] ;
kfree ( buffer ) ;
return sprintf ( buf , " % d " , retval ) ;
}
static ssize_t port1_store ( 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 )
return 0 ;
tmp = simple_strtoul ( buf , NULL , 10 ) ;
if ( tmp > 0 xFF )
tmp = 0 xFF ;
else if ( tmp < 0 )
tmp = 0 ;
retval = vendor_command ( cytherm - > udev , WRITE_PORT , 1 ,
tmp , buffer , 0 x93000012 , 0 x00000000 , 0 x40000000 , 0 x00000000 ,
if ( retval )
dev_dbg ( & cytherm - > udev - > dev , " retval = % d \ n " , retval ) ;
kfree ( buffer ) ;
return count ;
}
static DEVICE_ATTR_RW ( port1 ) ;
static struct attribute * cytherm_attrs [ ] = {
& dev_attr_brightness . attr ,
& dev_attr_temp . attr ,
& dev_attr_button . attr ,
& dev_attr_port0 . attr ,
& dev_attr_port1 . attr ,
NULL ,
} ;
ATTRIBUTE_GROUPS ( cytherm ) ;
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 ;
int retval = - ENOMEM ;
dev = kzalloc ( sizeof ( struct usb_cytherm ) , GFP_KERNEL ) ;
if ( ! dev )
goto error_mem ;
dev - > udev = usb_get_dev ( udev ) ;
usb_set_intfdata ( interface , dev ) ;
dev - > brightness = 0 xFF ;
dev_info ( & interface - > dev ,
" Cypress thermometer device now attached \ n " ) ;
return 0 ;
error_mem :
return retval ;
}
static void cytherm_disconnect ( struct usb_interface * interface )
{
struct usb_cytherm * dev ;
dev = usb_get_intfdata ( interface ) ;
/* 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" );
}
/* 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,
.dev_groups = cytherm_groups,
};
module_usb_driver(cytherm_driver);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL" );
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