Release 4.9 drivers/usb/misc/cytherm.c

/* -*- 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);
}



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erik rigtorp
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greg kroah-hartman
greg kroah-hartman
1
1.64%
1
50.00%
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61
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2
100.00%


#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);
}

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erik rigtorp
47
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yani ioannou
5
9.62%
1
50.00%
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52
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2
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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)
		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;
}

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erik rigtorp
erik rigtorp
189
95.94%
1
25.00%
yani ioannou
yani ioannou
5
2.54%
1
25.00%
linus torvalds
linus torvalds
2
1.02%
1
25.00%
jan engelhardt
jan engelhardt
1
0.51%
1
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4
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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)
		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)));
}


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erik rigtorp
erik rigtorp
192
96.48%
1
33.33%
yani ioannou
yani ioannou
5
2.51%
1
33.33%
linus torvalds
linus torvalds
2
1.01%
1
33.33%
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199
100.00%
3
100.00%



static ssize_t set_temp(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	return count;
}

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erik rigtorp
erik rigtorp
22
81.48%
1
50.00%
yani ioannou
yani ioannou
5
18.52%
1
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27
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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)
		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");
}


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erik rigtorp
erik rigtorp
130
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1
33.33%
yani ioannou
yani ioannou
5
3.68%
1
33.33%
linus torvalds
linus torvalds
1
0.74%
1
33.33%
Total
136
100.00%
3
100.00%



static ssize_t set_button(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	return count;
}

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erik rigtorp
erik rigtorp
22
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yani ioannou
yani ioannou
5
18.52%
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27
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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)
		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);
}


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erik rigtorp
erik rigtorp
118
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33.33%
yani ioannou
yani ioannou
5
4.03%
1
33.33%
linus torvalds
linus torvalds
1
0.81%
1
33.33%
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124
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3
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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)
		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;
}

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erik rigtorp
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yani ioannou
5
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1
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linus torvalds
linus torvalds
1
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1
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149
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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)
		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);
}


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erik rigtorp
118
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33.33%
yani ioannou
yani ioannou
5
4.03%
1
33.33%
linus torvalds
linus torvalds
1
0.81%
1
33.33%
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124
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100.00%



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)
		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;
}

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erik rigtorp
143
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yani ioannou
yani ioannou
5
3.36%
1
33.33%
linus torvalds
linus torvalds
1
0.67%
1
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149
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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)
		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;
}

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greg kroah-hartman
117
42.24%
1
25.00%
wolfram sang
wolfram sang
1
0.36%
1
25.00%
oliver neukum
oliver neukum
1
0.36%
1
25.00%
Total
277
100.00%
4
100.00%



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");
}

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module_usb_driver(cytherm_driver);


MODULE_AUTHOR(DRIVER_AUTHOR);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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erik rigtorp
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8.33%
greg kroah-hartman
greg kroah-hartman
120
6.26%
3
25.00%
yani ioannou
yani ioannou
50
2.61%
1
8.33%
linus torvalds
linus torvalds
9
0.47%
1
8.33%
oliver neukum
oliver neukum
9
0.47%
2
16.67%
tejun heo
tejun heo
3
0.16%
1
8.33%
wolfram sang
wolfram sang
1
0.05%
1
8.33%
jan engelhardt
jan engelhardt
1
0.05%
1
8.33%
marton nemeth
marton nemeth
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1
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Directory: drivers/usb/misc