drivers/usb/misc/cytherm.c - linux - Git at Google

 // 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	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;
 };


 /* 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 brightness_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);

 	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 = 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;
 }
 static DEVICE_ATTR_RW(brightness);


 #define TEMP 0x33 /* RAM location for temperature */
 #define SIGN 0x34 /* 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 0x7a

 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 (!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 > 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_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)
 		dev_dbg(&cytherm->udev->dev, "retval = %d\n", 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 > 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_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 = 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;

 	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");
	// 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 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;
	};


	/* 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 brightness_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);

	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 = 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;
	}
	static DEVICE_ATTR_RW(brightness);


	#define TEMP 0x33 /* RAM location for temperature */
	#define SIGN 0x34 /* 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 0x7a

	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 (!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 > 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_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)
	dev_dbg(&cytherm->udev->dev, "retval = %d\n", 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 > 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_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 = 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;

	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");