Loading...
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/* Vendor requests */
40/* They all operate on one byte at a time */
41#define PING 0x00
42#define READ_ROM 0x01 /* Reads form ROM, value = address */
43#define READ_RAM 0x02 /* Reads form RAM, value = address */
44#define WRITE_RAM 0x03 /* Write to RAM, value = address, index = data */
45#define READ_PORT 0x04 /* Reads from port, value = address */
46#define WRITE_PORT 0x05 /* Write to port, value = address, index = data */
47
48
49/* Send a vendor command to device */
50static int vendor_command(struct usb_device *dev, unsigned char request,
51 unsigned char value, unsigned char index,
52 void *buf, int size)
53{
54 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
55 request,
56 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
57 value,
58 index, buf, size,
59 USB_CTRL_GET_TIMEOUT);
60}
61
62
63
64#define BRIGHTNESS 0x2c /* RAM location for brightness value */
65#define BRIGHTNESS_SEM 0x2b /* RAM location for brightness semaphore */
66
67static ssize_t brightness_show(struct device *dev, struct device_attribute *attr, char *buf)
68{
69 struct usb_interface *intf = to_usb_interface(dev);
70 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
71
72 return sprintf(buf, "%i", cytherm->brightness);
73}
74
75static ssize_t brightness_store(struct device *dev, struct device_attribute *attr, const char *buf,
76 size_t count)
77{
78 struct usb_interface *intf = to_usb_interface(dev);
79 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
80
81 unsigned char *buffer;
82 int retval;
83
84 buffer = kmalloc(8, GFP_KERNEL);
85 if (!buffer)
86 return 0;
87
88 cytherm->brightness = simple_strtoul(buf, NULL, 10);
89
90 if (cytherm->brightness > 0xFF)
91 cytherm->brightness = 0xFF;
92 else if (cytherm->brightness < 0)
93 cytherm->brightness = 0;
94
95 /* Set brightness */
96 retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS,
97 cytherm->brightness, buffer, 8);
98 if (retval)
99 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
100 /* Inform µC that we have changed the brightness setting */
101 retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS_SEM,
102 0x01, buffer, 8);
103 if (retval)
104 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
105
106 kfree(buffer);
107
108 return count;
109}
110static DEVICE_ATTR_RW(brightness);
111
112
113#define TEMP 0x33 /* RAM location for temperature */
114#define SIGN 0x34 /* RAM location for temperature sign */
115
116static ssize_t temp_show(struct device *dev, struct device_attribute *attr, char *buf)
117{
118
119 struct usb_interface *intf = to_usb_interface(dev);
120 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
121
122 int retval;
123 unsigned char *buffer;
124
125 int temp, sign;
126
127 buffer = kmalloc(8, GFP_KERNEL);
128 if (!buffer)
129 return 0;
130
131 /* read temperature */
132 retval = vendor_command(cytherm->udev, READ_RAM, TEMP, 0, buffer, 8);
133 if (retval)
134 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
135 temp = buffer[1];
136
137 /* read sign */
138 retval = vendor_command(cytherm->udev, READ_RAM, SIGN, 0, buffer, 8);
139 if (retval)
140 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
141 sign = buffer[1];
142
143 kfree(buffer);
144
145 return sprintf(buf, "%c%i.%i", sign ? '-' : '+', temp >> 1,
146 5*(temp - ((temp >> 1) << 1)));
147}
148static DEVICE_ATTR_RO(temp);
149
150
151#define BUTTON 0x7a
152
153static ssize_t button_show(struct device *dev, struct device_attribute *attr, char *buf)
154{
155
156 struct usb_interface *intf = to_usb_interface(dev);
157 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
158
159 int retval;
160 unsigned char *buffer;
161
162 buffer = kmalloc(8, GFP_KERNEL);
163 if (!buffer)
164 return 0;
165
166 /* check button */
167 retval = vendor_command(cytherm->udev, READ_RAM, BUTTON, 0, buffer, 8);
168 if (retval)
169 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
170
171 retval = buffer[1];
172
173 kfree(buffer);
174
175 if (retval)
176 return sprintf(buf, "1");
177 else
178 return sprintf(buf, "0");
179}
180static DEVICE_ATTR_RO(button);
181
182
183static ssize_t port0_show(struct device *dev, struct device_attribute *attr, char *buf)
184{
185 struct usb_interface *intf = to_usb_interface(dev);
186 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
187
188 int retval;
189 unsigned char *buffer;
190
191 buffer = kmalloc(8, GFP_KERNEL);
192 if (!buffer)
193 return 0;
194
195 retval = vendor_command(cytherm->udev, READ_PORT, 0, 0, buffer, 8);
196 if (retval)
197 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
198
199 retval = buffer[1];
200
201 kfree(buffer);
202
203 return sprintf(buf, "%d", retval);
204}
205
206
207static ssize_t port0_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
208{
209 struct usb_interface *intf = to_usb_interface(dev);
210 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
211
212 unsigned char *buffer;
213 int retval;
214 int tmp;
215
216 buffer = kmalloc(8, GFP_KERNEL);
217 if (!buffer)
218 return 0;
219
220 tmp = simple_strtoul(buf, NULL, 10);
221
222 if (tmp > 0xFF)
223 tmp = 0xFF;
224 else if (tmp < 0)
225 tmp = 0;
226
227 retval = vendor_command(cytherm->udev, WRITE_PORT, 0,
228 tmp, buffer, 8);
229 if (retval)
230 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
231
232 kfree(buffer);
233
234 return count;
235}
236static DEVICE_ATTR_RW(port0);
237
238static ssize_t port1_show(struct device *dev, struct device_attribute *attr, char *buf)
239{
240 struct usb_interface *intf = to_usb_interface(dev);
241 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
242
243 int retval;
244 unsigned char *buffer;
245
246 buffer = kmalloc(8, GFP_KERNEL);
247 if (!buffer)
248 return 0;
249
250 retval = vendor_command(cytherm->udev, READ_PORT, 1, 0, buffer, 8);
251 if (retval)
252 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
253
254 retval = buffer[1];
255
256 kfree(buffer);
257
258 return sprintf(buf, "%d", retval);
259}
260
261
262static ssize_t port1_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
263{
264 struct usb_interface *intf = to_usb_interface(dev);
265 struct usb_cytherm *cytherm = usb_get_intfdata(intf);
266
267 unsigned char *buffer;
268 int retval;
269 int tmp;
270
271 buffer = kmalloc(8, GFP_KERNEL);
272 if (!buffer)
273 return 0;
274
275 tmp = simple_strtoul(buf, NULL, 10);
276
277 if (tmp > 0xFF)
278 tmp = 0xFF;
279 else if (tmp < 0)
280 tmp = 0;
281
282 retval = vendor_command(cytherm->udev, WRITE_PORT, 1,
283 tmp, buffer, 8);
284 if (retval)
285 dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
286
287 kfree(buffer);
288
289 return count;
290}
291static DEVICE_ATTR_RW(port1);
292
293static struct attribute *cytherm_attrs[] = {
294 &dev_attr_brightness.attr,
295 &dev_attr_temp.attr,
296 &dev_attr_button.attr,
297 &dev_attr_port0.attr,
298 &dev_attr_port1.attr,
299 NULL,
300};
301ATTRIBUTE_GROUPS(cytherm);
302
303static int cytherm_probe(struct usb_interface *interface,
304 const struct usb_device_id *id)
305{
306 struct usb_device *udev = interface_to_usbdev(interface);
307 struct usb_cytherm *dev = NULL;
308 int retval = -ENOMEM;
309
310 dev = kzalloc (sizeof(struct usb_cytherm), GFP_KERNEL);
311 if (!dev)
312 goto error_mem;
313
314 dev->udev = usb_get_dev(udev);
315
316 usb_set_intfdata (interface, dev);
317
318 dev->brightness = 0xFF;
319
320 dev_info (&interface->dev,
321 "Cypress thermometer device now attached\n");
322 return 0;
323
324error_mem:
325 return retval;
326}
327
328static void cytherm_disconnect(struct usb_interface *interface)
329{
330 struct usb_cytherm *dev;
331
332 dev = usb_get_intfdata (interface);
333
334 /* first remove the files, then NULL the pointer */
335 usb_set_intfdata (interface, NULL);
336
337 usb_put_dev(dev->udev);
338
339 kfree(dev);
340
341 dev_info(&interface->dev, "Cypress thermometer now disconnected\n");
342}
343
344/* usb specific object needed to register this driver with the usb subsystem */
345static struct usb_driver cytherm_driver = {
346 .name = "cytherm",
347 .probe = cytherm_probe,
348 .disconnect = cytherm_disconnect,
349 .id_table = id_table,
350 .dev_groups = cytherm_groups,
351};
352
353module_usb_driver(cytherm_driver);
354
355MODULE_AUTHOR(DRIVER_AUTHOR);
356MODULE_DESCRIPTION(DRIVER_DESC);
357MODULE_LICENSE("GPL");