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1/* -*- linux-c -*-
2 * Cypress USB Thermometer driver
3 *
4 * Copyright (c) 2004 Erik Rigtorp <erkki@linux.nu> <erik@rigtorp.com>
5 *
6 * This driver works with Elektor magazine USB Interface as published in
7 * issue #291. It should also work with the original starter kit/demo board
8 * from Cypress.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation, version 2.
13 *
14 */
15
16
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/module.h>
22#include <linux/usb.h>
23
24#define DRIVER_VERSION "v1.0"
25#define DRIVER_AUTHOR "Erik Rigtorp"
26#define DRIVER_DESC "Cypress USB Thermometer driver"
27
28#define USB_SKEL_VENDOR_ID 0x04b4
29#define USB_SKEL_PRODUCT_ID 0x0002
30
31static const struct usb_device_id id_table[] = {
32 { USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
33 { }
34};
35MODULE_DEVICE_TABLE (usb, id_table);
36
37/* Structure to hold all of our device specific stuff */
38struct usb_cytherm {
39 struct usb_device *udev; /* save off the usb device pointer */
40 struct usb_interface *interface; /* the interface for this device */
41 int brightness;
42};
43
44
45/* local function prototypes */
46static int cytherm_probe(struct usb_interface *interface,
47 const struct usb_device_id *id);
48static void cytherm_disconnect(struct usb_interface *interface);
49
50
51/* usb specific object needed to register this driver with the usb subsystem */
52static struct usb_driver cytherm_driver = {
53 .name = "cytherm",
54 .probe = cytherm_probe,
55 .disconnect = cytherm_disconnect,
56 .id_table = id_table,
57};
58
59/* Vendor requests */
60/* They all operate on one byte at a time */
61#define PING 0x00
62#define READ_ROM 0x01 /* Reads form ROM, value = address */
63#define READ_RAM 0x02 /* Reads form RAM, value = address */
64#define WRITE_RAM 0x03 /* Write to RAM, value = address, index = data */
65#define READ_PORT 0x04 /* Reads from port, value = address */
66#define WRITE_PORT 0x05 /* Write to port, value = address, index = data */
67
68
69/* Send a vendor command to device */
70static int vendor_command(struct usb_device *dev, unsigned char request,
71 unsigned char value, unsigned char index,
72 void *buf, int size)
73{
74 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
75 request,
76 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
77 value,
78 index, buf, size,
79 USB_CTRL_GET_TIMEOUT);
80}
81
82
83
84#define BRIGHTNESS 0x2c /* RAM location for brightness value */
85#define BRIGHTNESS_SEM 0x2b /* RAM location for brightness semaphore */
86
87static ssize_t show_brightness(struct device *dev, struct device_attribute *attr, char *buf)
88{
89 struct usb_interface *intf = to_usb_interface(dev);
90 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
91
92 return sprintf(buf, "%i", cytherm->brightness);
93}
94
95static ssize_t set_brightness(struct device *dev, struct device_attribute *attr, const char *buf,
96 size_t count)
97{
98 struct usb_interface *intf = to_usb_interface(dev);
99 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
100
101 unsigned char *buffer;
102 int retval;
103
104 buffer = kmalloc(8, GFP_KERNEL);
105 if (!buffer) {
106 dev_err(&cytherm->udev->dev, "out of memory\n");
107 return 0;
108 }
109
110 cytherm->brightness = simple_strtoul(buf, NULL, 10);
111
112 if (cytherm->brightness > 0xFF)
113 cytherm->brightness = 0xFF;
114 else if (cytherm->brightness < 0)
115 cytherm->brightness = 0;
116
117 /* Set brightness */
118 retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS,
119 cytherm->brightness, buffer, 8);
120 if (retval)
121 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
122 /* Inform µC that we have changed the brightness setting */
123 retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS_SEM,
124 0x01, buffer, 8);
125 if (retval)
126 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
127
128 kfree(buffer);
129
130 return count;
131}
132
133static DEVICE_ATTR(brightness, S_IRUGO | S_IWUSR | S_IWGRP,
134 show_brightness, set_brightness);
135
136
137#define TEMP 0x33 /* RAM location for temperature */
138#define SIGN 0x34 /* RAM location for temperature sign */
139
140static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf)
141{
142
143 struct usb_interface *intf = to_usb_interface(dev);
144 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
145
146 int retval;
147 unsigned char *buffer;
148
149 int temp, sign;
150
151 buffer = kmalloc(8, GFP_KERNEL);
152 if (!buffer) {
153 dev_err(&cytherm->udev->dev, "out of memory\n");
154 return 0;
155 }
156
157 /* read temperature */
158 retval = vendor_command(cytherm->udev, READ_RAM, TEMP, 0, buffer, 8);
159 if (retval)
160 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
161 temp = buffer[1];
162
163 /* read sign */
164 retval = vendor_command(cytherm->udev, READ_RAM, SIGN, 0, buffer, 8);
165 if (retval)
166 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
167 sign = buffer[1];
168
169 kfree(buffer);
170
171 return sprintf(buf, "%c%i.%i", sign ? '-' : '+', temp >> 1,
172 5*(temp - ((temp >> 1) << 1)));
173}
174
175
176static ssize_t set_temp(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
177{
178 return count;
179}
180
181static DEVICE_ATTR(temp, S_IRUGO, show_temp, set_temp);
182
183
184#define BUTTON 0x7a
185
186static ssize_t show_button(struct device *dev, struct device_attribute *attr, char *buf)
187{
188
189 struct usb_interface *intf = to_usb_interface(dev);
190 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
191
192 int retval;
193 unsigned char *buffer;
194
195 buffer = kmalloc(8, GFP_KERNEL);
196 if (!buffer) {
197 dev_err(&cytherm->udev->dev, "out of memory\n");
198 return 0;
199 }
200
201 /* check button */
202 retval = vendor_command(cytherm->udev, READ_RAM, BUTTON, 0, buffer, 8);
203 if (retval)
204 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
205
206 retval = buffer[1];
207
208 kfree(buffer);
209
210 if (retval)
211 return sprintf(buf, "1");
212 else
213 return sprintf(buf, "0");
214}
215
216
217static ssize_t set_button(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
218{
219 return count;
220}
221
222static DEVICE_ATTR(button, S_IRUGO, show_button, set_button);
223
224
225static ssize_t show_port0(struct device *dev, struct device_attribute *attr, char *buf)
226{
227 struct usb_interface *intf = to_usb_interface(dev);
228 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
229
230 int retval;
231 unsigned char *buffer;
232
233 buffer = kmalloc(8, GFP_KERNEL);
234 if (!buffer) {
235 dev_err(&cytherm->udev->dev, "out of memory\n");
236 return 0;
237 }
238
239 retval = vendor_command(cytherm->udev, READ_PORT, 0, 0, buffer, 8);
240 if (retval)
241 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
242
243 retval = buffer[1];
244
245 kfree(buffer);
246
247 return sprintf(buf, "%d", retval);
248}
249
250
251static ssize_t set_port0(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
252{
253 struct usb_interface *intf = to_usb_interface(dev);
254 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
255
256 unsigned char *buffer;
257 int retval;
258 int tmp;
259
260 buffer = kmalloc(8, GFP_KERNEL);
261 if (!buffer) {
262 dev_err(&cytherm->udev->dev, "out of memory\n");
263 return 0;
264 }
265
266 tmp = simple_strtoul(buf, NULL, 10);
267
268 if (tmp > 0xFF)
269 tmp = 0xFF;
270 else if (tmp < 0)
271 tmp = 0;
272
273 retval = vendor_command(cytherm->udev, WRITE_PORT, 0,
274 tmp, buffer, 8);
275 if (retval)
276 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
277
278 kfree(buffer);
279
280 return count;
281}
282
283static DEVICE_ATTR(port0, S_IRUGO | S_IWUSR | S_IWGRP, show_port0, set_port0);
284
285static ssize_t show_port1(struct device *dev, struct device_attribute *attr, char *buf)
286{
287 struct usb_interface *intf = to_usb_interface(dev);
288 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
289
290 int retval;
291 unsigned char *buffer;
292
293 buffer = kmalloc(8, GFP_KERNEL);
294 if (!buffer) {
295 dev_err(&cytherm->udev->dev, "out of memory\n");
296 return 0;
297 }
298
299 retval = vendor_command(cytherm->udev, READ_PORT, 1, 0, buffer, 8);
300 if (retval)
301 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
302
303 retval = buffer[1];
304
305 kfree(buffer);
306
307 return sprintf(buf, "%d", retval);
308}
309
310
311static ssize_t set_port1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
312{
313 struct usb_interface *intf = to_usb_interface(dev);
314 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
315
316 unsigned char *buffer;
317 int retval;
318 int tmp;
319
320 buffer = kmalloc(8, GFP_KERNEL);
321 if (!buffer) {
322 dev_err(&cytherm->udev->dev, "out of memory\n");
323 return 0;
324 }
325
326 tmp = simple_strtoul(buf, NULL, 10);
327
328 if (tmp > 0xFF)
329 tmp = 0xFF;
330 else if (tmp < 0)
331 tmp = 0;
332
333 retval = vendor_command(cytherm->udev, WRITE_PORT, 1,
334 tmp, buffer, 8);
335 if (retval)
336 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
337
338 kfree(buffer);
339
340 return count;
341}
342
343static DEVICE_ATTR(port1, S_IRUGO | S_IWUSR | S_IWGRP, show_port1, set_port1);
344
345
346
347static int cytherm_probe(struct usb_interface *interface,
348 const struct usb_device_id *id)
349{
350 struct usb_device *udev = interface_to_usbdev(interface);
351 struct usb_cytherm *dev = NULL;
352 int retval = -ENOMEM;
353
354 dev = kzalloc (sizeof(struct usb_cytherm), GFP_KERNEL);
355 if (dev == NULL) {
356 dev_err (&interface->dev, "Out of memory\n");
357 goto error_mem;
358 }
359
360 dev->udev = usb_get_dev(udev);
361
362 usb_set_intfdata (interface, dev);
363
364 dev->brightness = 0xFF;
365
366 retval = device_create_file(&interface->dev, &dev_attr_brightness);
367 if (retval)
368 goto error;
369 retval = device_create_file(&interface->dev, &dev_attr_temp);
370 if (retval)
371 goto error;
372 retval = device_create_file(&interface->dev, &dev_attr_button);
373 if (retval)
374 goto error;
375 retval = device_create_file(&interface->dev, &dev_attr_port0);
376 if (retval)
377 goto error;
378 retval = device_create_file(&interface->dev, &dev_attr_port1);
379 if (retval)
380 goto error;
381
382 dev_info (&interface->dev,
383 "Cypress thermometer device now attached\n");
384 return 0;
385error:
386 device_remove_file(&interface->dev, &dev_attr_brightness);
387 device_remove_file(&interface->dev, &dev_attr_temp);
388 device_remove_file(&interface->dev, &dev_attr_button);
389 device_remove_file(&interface->dev, &dev_attr_port0);
390 device_remove_file(&interface->dev, &dev_attr_port1);
391 usb_set_intfdata (interface, NULL);
392 usb_put_dev(dev->udev);
393 kfree(dev);
394error_mem:
395 return retval;
396}
397
398static void cytherm_disconnect(struct usb_interface *interface)
399{
400 struct usb_cytherm *dev;
401
402 dev = usb_get_intfdata (interface);
403
404 device_remove_file(&interface->dev, &dev_attr_brightness);
405 device_remove_file(&interface->dev, &dev_attr_temp);
406 device_remove_file(&interface->dev, &dev_attr_button);
407 device_remove_file(&interface->dev, &dev_attr_port0);
408 device_remove_file(&interface->dev, &dev_attr_port1);
409
410 /* first remove the files, then NULL the pointer */
411 usb_set_intfdata (interface, NULL);
412
413 usb_put_dev(dev->udev);
414
415 kfree(dev);
416
417 dev_info(&interface->dev, "Cypress thermometer now disconnected\n");
418}
419
420
421static int __init usb_cytherm_init(void)
422{
423 int result;
424
425 result = usb_register(&cytherm_driver);
426 if (result) {
427 printk(KERN_ERR KBUILD_MODNAME ": usb_register failed! "
428 "Error number: %d\n", result);
429 return result;
430 }
431
432 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
433 DRIVER_DESC "\n");
434 return 0;
435}
436
437static void __exit usb_cytherm_exit(void)
438{
439 usb_deregister(&cytherm_driver);
440}
441
442
443module_init (usb_cytherm_init);
444module_exit (usb_cytherm_exit);
445
446MODULE_AUTHOR(DRIVER_AUTHOR);
447MODULE_DESCRIPTION(DRIVER_DESC);
448MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/* -*- linux-c -*-
3 * Cypress USB Thermometer driver
4 *
5 * Copyright (c) 2004 Erik Rigtorp <erkki@linux.nu> <erik@rigtorp.com>
6 *
7 * This driver works with Elektor magazine USB Interface as published in
8 * issue #291. It should also work with the original starter kit/demo board
9 * from Cypress.
10 */
11
12
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/usb.h>
18
19#define DRIVER_AUTHOR "Erik Rigtorp"
20#define DRIVER_DESC "Cypress USB Thermometer driver"
21
22#define USB_SKEL_VENDOR_ID 0x04b4
23#define USB_SKEL_PRODUCT_ID 0x0002
24
25static const struct usb_device_id id_table[] = {
26 { USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
27 { }
28};
29MODULE_DEVICE_TABLE (usb, id_table);
30
31/* Structure to hold all of our device specific stuff */
32struct usb_cytherm {
33 struct usb_device *udev; /* save off the usb device pointer */
34 struct usb_interface *interface; /* the interface for this device */
35 int brightness;
36};
37
38
39/* local function prototypes */
40static int cytherm_probe(struct usb_interface *interface,
41 const struct usb_device_id *id);
42static void cytherm_disconnect(struct usb_interface *interface);
43
44
45/* usb specific object needed to register this driver with the usb subsystem */
46static struct usb_driver cytherm_driver = {
47 .name = "cytherm",
48 .probe = cytherm_probe,
49 .disconnect = cytherm_disconnect,
50 .id_table = id_table,
51};
52
53/* Vendor requests */
54/* They all operate on one byte at a time */
55#define PING 0x00
56#define READ_ROM 0x01 /* Reads form ROM, value = address */
57#define READ_RAM 0x02 /* Reads form RAM, value = address */
58#define WRITE_RAM 0x03 /* Write to RAM, value = address, index = data */
59#define READ_PORT 0x04 /* Reads from port, value = address */
60#define WRITE_PORT 0x05 /* Write to port, value = address, index = data */
61
62
63/* Send a vendor command to device */
64static int vendor_command(struct usb_device *dev, unsigned char request,
65 unsigned char value, unsigned char index,
66 void *buf, int size)
67{
68 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
69 request,
70 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
71 value,
72 index, buf, size,
73 USB_CTRL_GET_TIMEOUT);
74}
75
76
77
78#define BRIGHTNESS 0x2c /* RAM location for brightness value */
79#define BRIGHTNESS_SEM 0x2b /* RAM location for brightness semaphore */
80
81static ssize_t brightness_show(struct device *dev, struct device_attribute *attr, char *buf)
82{
83 struct usb_interface *intf = to_usb_interface(dev);
84 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
85
86 return sprintf(buf, "%i", cytherm->brightness);
87}
88
89static ssize_t brightness_store(struct device *dev, struct device_attribute *attr, const char *buf,
90 size_t count)
91{
92 struct usb_interface *intf = to_usb_interface(dev);
93 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
94
95 unsigned char *buffer;
96 int retval;
97
98 buffer = kmalloc(8, GFP_KERNEL);
99 if (!buffer)
100 return 0;
101
102 cytherm->brightness = simple_strtoul(buf, NULL, 10);
103
104 if (cytherm->brightness > 0xFF)
105 cytherm->brightness = 0xFF;
106 else if (cytherm->brightness < 0)
107 cytherm->brightness = 0;
108
109 /* Set brightness */
110 retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS,
111 cytherm->brightness, buffer, 8);
112 if (retval)
113 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
114 /* Inform µC that we have changed the brightness setting */
115 retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS_SEM,
116 0x01, buffer, 8);
117 if (retval)
118 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
119
120 kfree(buffer);
121
122 return count;
123}
124static DEVICE_ATTR_RW(brightness);
125
126
127#define TEMP 0x33 /* RAM location for temperature */
128#define SIGN 0x34 /* RAM location for temperature sign */
129
130static ssize_t temp_show(struct device *dev, struct device_attribute *attr, char *buf)
131{
132
133 struct usb_interface *intf = to_usb_interface(dev);
134 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
135
136 int retval;
137 unsigned char *buffer;
138
139 int temp, sign;
140
141 buffer = kmalloc(8, GFP_KERNEL);
142 if (!buffer)
143 return 0;
144
145 /* read temperature */
146 retval = vendor_command(cytherm->udev, READ_RAM, TEMP, 0, buffer, 8);
147 if (retval)
148 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
149 temp = buffer[1];
150
151 /* read sign */
152 retval = vendor_command(cytherm->udev, READ_RAM, SIGN, 0, buffer, 8);
153 if (retval)
154 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
155 sign = buffer[1];
156
157 kfree(buffer);
158
159 return sprintf(buf, "%c%i.%i", sign ? '-' : '+', temp >> 1,
160 5*(temp - ((temp >> 1) << 1)));
161}
162static DEVICE_ATTR_RO(temp);
163
164
165#define BUTTON 0x7a
166
167static ssize_t button_show(struct device *dev, struct device_attribute *attr, char *buf)
168{
169
170 struct usb_interface *intf = to_usb_interface(dev);
171 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
172
173 int retval;
174 unsigned char *buffer;
175
176 buffer = kmalloc(8, GFP_KERNEL);
177 if (!buffer)
178 return 0;
179
180 /* check button */
181 retval = vendor_command(cytherm->udev, READ_RAM, BUTTON, 0, buffer, 8);
182 if (retval)
183 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
184
185 retval = buffer[1];
186
187 kfree(buffer);
188
189 if (retval)
190 return sprintf(buf, "1");
191 else
192 return sprintf(buf, "0");
193}
194static DEVICE_ATTR_RO(button);
195
196
197static ssize_t port0_show(struct device *dev, struct device_attribute *attr, char *buf)
198{
199 struct usb_interface *intf = to_usb_interface(dev);
200 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
201
202 int retval;
203 unsigned char *buffer;
204
205 buffer = kmalloc(8, GFP_KERNEL);
206 if (!buffer)
207 return 0;
208
209 retval = vendor_command(cytherm->udev, READ_PORT, 0, 0, buffer, 8);
210 if (retval)
211 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
212
213 retval = buffer[1];
214
215 kfree(buffer);
216
217 return sprintf(buf, "%d", retval);
218}
219
220
221static ssize_t port0_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
222{
223 struct usb_interface *intf = to_usb_interface(dev);
224 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
225
226 unsigned char *buffer;
227 int retval;
228 int tmp;
229
230 buffer = kmalloc(8, GFP_KERNEL);
231 if (!buffer)
232 return 0;
233
234 tmp = simple_strtoul(buf, NULL, 10);
235
236 if (tmp > 0xFF)
237 tmp = 0xFF;
238 else if (tmp < 0)
239 tmp = 0;
240
241 retval = vendor_command(cytherm->udev, WRITE_PORT, 0,
242 tmp, buffer, 8);
243 if (retval)
244 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
245
246 kfree(buffer);
247
248 return count;
249}
250static DEVICE_ATTR_RW(port0);
251
252static ssize_t port1_show(struct device *dev, struct device_attribute *attr, char *buf)
253{
254 struct usb_interface *intf = to_usb_interface(dev);
255 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
256
257 int retval;
258 unsigned char *buffer;
259
260 buffer = kmalloc(8, GFP_KERNEL);
261 if (!buffer)
262 return 0;
263
264 retval = vendor_command(cytherm->udev, READ_PORT, 1, 0, buffer, 8);
265 if (retval)
266 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
267
268 retval = buffer[1];
269
270 kfree(buffer);
271
272 return sprintf(buf, "%d", retval);
273}
274
275
276static ssize_t port1_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
277{
278 struct usb_interface *intf = to_usb_interface(dev);
279 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
280
281 unsigned char *buffer;
282 int retval;
283 int tmp;
284
285 buffer = kmalloc(8, GFP_KERNEL);
286 if (!buffer)
287 return 0;
288
289 tmp = simple_strtoul(buf, NULL, 10);
290
291 if (tmp > 0xFF)
292 tmp = 0xFF;
293 else if (tmp < 0)
294 tmp = 0;
295
296 retval = vendor_command(cytherm->udev, WRITE_PORT, 1,
297 tmp, buffer, 8);
298 if (retval)
299 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
300
301 kfree(buffer);
302
303 return count;
304}
305static DEVICE_ATTR_RW(port1);
306
307
308static int cytherm_probe(struct usb_interface *interface,
309 const struct usb_device_id *id)
310{
311 struct usb_device *udev = interface_to_usbdev(interface);
312 struct usb_cytherm *dev = NULL;
313 int retval = -ENOMEM;
314
315 dev = kzalloc (sizeof(struct usb_cytherm), GFP_KERNEL);
316 if (!dev)
317 goto error_mem;
318
319 dev->udev = usb_get_dev(udev);
320
321 usb_set_intfdata (interface, dev);
322
323 dev->brightness = 0xFF;
324
325 retval = device_create_file(&interface->dev, &dev_attr_brightness);
326 if (retval)
327 goto error;
328 retval = device_create_file(&interface->dev, &dev_attr_temp);
329 if (retval)
330 goto error;
331 retval = device_create_file(&interface->dev, &dev_attr_button);
332 if (retval)
333 goto error;
334 retval = device_create_file(&interface->dev, &dev_attr_port0);
335 if (retval)
336 goto error;
337 retval = device_create_file(&interface->dev, &dev_attr_port1);
338 if (retval)
339 goto error;
340
341 dev_info (&interface->dev,
342 "Cypress thermometer device now attached\n");
343 return 0;
344error:
345 device_remove_file(&interface->dev, &dev_attr_brightness);
346 device_remove_file(&interface->dev, &dev_attr_temp);
347 device_remove_file(&interface->dev, &dev_attr_button);
348 device_remove_file(&interface->dev, &dev_attr_port0);
349 device_remove_file(&interface->dev, &dev_attr_port1);
350 usb_set_intfdata (interface, NULL);
351 usb_put_dev(dev->udev);
352 kfree(dev);
353error_mem:
354 return retval;
355}
356
357static void cytherm_disconnect(struct usb_interface *interface)
358{
359 struct usb_cytherm *dev;
360
361 dev = usb_get_intfdata (interface);
362
363 device_remove_file(&interface->dev, &dev_attr_brightness);
364 device_remove_file(&interface->dev, &dev_attr_temp);
365 device_remove_file(&interface->dev, &dev_attr_button);
366 device_remove_file(&interface->dev, &dev_attr_port0);
367 device_remove_file(&interface->dev, &dev_attr_port1);
368
369 /* first remove the files, then NULL the pointer */
370 usb_set_intfdata (interface, NULL);
371
372 usb_put_dev(dev->udev);
373
374 kfree(dev);
375
376 dev_info(&interface->dev, "Cypress thermometer now disconnected\n");
377}
378
379module_usb_driver(cytherm_driver);
380
381MODULE_AUTHOR(DRIVER_AUTHOR);
382MODULE_DESCRIPTION(DRIVER_DESC);
383MODULE_LICENSE("GPL");