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1da177e4 LT |
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 | ||
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/errno.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/module.h> |
21 | #include <linux/usb.h> | |
22 | ||
23 | #define DRIVER_VERSION "v1.0" | |
24 | #define DRIVER_AUTHOR "Erik Rigtorp" | |
25 | #define DRIVER_DESC "Cypress USB Thermometer driver" | |
26 | ||
27 | #define USB_SKEL_VENDOR_ID 0x04b4 | |
28 | #define USB_SKEL_PRODUCT_ID 0x0002 | |
29 | ||
33b9e162 | 30 | static const struct usb_device_id id_table[] = { |
1da177e4 LT |
31 | { USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) }, |
32 | { } | |
33 | }; | |
34 | MODULE_DEVICE_TABLE (usb, id_table); | |
35 | ||
36 | /* Structure to hold all of our device specific stuff */ | |
37 | struct usb_cytherm { | |
38 | struct usb_device *udev; /* save off the usb device pointer */ | |
39 | struct usb_interface *interface; /* the interface for this device */ | |
40 | int brightness; | |
41 | }; | |
42 | ||
43 | ||
44 | /* local function prototypes */ | |
45 | static int cytherm_probe(struct usb_interface *interface, | |
46 | const struct usb_device_id *id); | |
47 | static void cytherm_disconnect(struct usb_interface *interface); | |
48 | ||
49 | ||
50 | /* usb specific object needed to register this driver with the usb subsystem */ | |
51 | static struct usb_driver cytherm_driver = { | |
1da177e4 LT |
52 | .name = "cytherm", |
53 | .probe = cytherm_probe, | |
54 | .disconnect = cytherm_disconnect, | |
55 | .id_table = id_table, | |
56 | }; | |
57 | ||
58 | /* Vendor requests */ | |
59 | /* They all operate on one byte at a time */ | |
60 | #define PING 0x00 | |
61 | #define READ_ROM 0x01 /* Reads form ROM, value = address */ | |
62 | #define READ_RAM 0x02 /* Reads form RAM, value = address */ | |
63 | #define WRITE_RAM 0x03 /* Write to RAM, value = address, index = data */ | |
64 | #define READ_PORT 0x04 /* Reads from port, value = address */ | |
65 | #define WRITE_PORT 0x05 /* Write to port, value = address, index = data */ | |
66 | ||
67 | ||
68 | /* Send a vendor command to device */ | |
69 | static int vendor_command(struct usb_device *dev, unsigned char request, | |
70 | unsigned char value, unsigned char index, | |
71 | void *buf, int size) | |
72 | { | |
73 | return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), | |
74 | request, | |
75 | USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER, | |
76 | value, | |
77 | index, buf, size, | |
78 | USB_CTRL_GET_TIMEOUT); | |
79 | } | |
80 | ||
81 | ||
82 | ||
83 | #define BRIGHTNESS 0x2c /* RAM location for brightness value */ | |
84 | #define BRIGHTNESS_SEM 0x2b /* RAM location for brightness semaphore */ | |
85 | ||
060b8845 | 86 | static ssize_t show_brightness(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
87 | { |
88 | struct usb_interface *intf = to_usb_interface(dev); | |
89 | struct usb_cytherm *cytherm = usb_get_intfdata(intf); | |
90 | ||
91 | return sprintf(buf, "%i", cytherm->brightness); | |
92 | } | |
93 | ||
060b8845 | 94 | static ssize_t set_brightness(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
95 | size_t count) |
96 | { | |
97 | struct usb_interface *intf = to_usb_interface(dev); | |
98 | struct usb_cytherm *cytherm = usb_get_intfdata(intf); | |
99 | ||
100 | unsigned char *buffer; | |
101 | int retval; | |
102 | ||
103 | buffer = kmalloc(8, GFP_KERNEL); | |
29a99df1 | 104 | if (!buffer) |
1da177e4 | 105 | return 0; |
1da177e4 LT |
106 | |
107 | cytherm->brightness = simple_strtoul(buf, NULL, 10); | |
108 | ||
109 | if (cytherm->brightness > 0xFF) | |
110 | cytherm->brightness = 0xFF; | |
111 | else if (cytherm->brightness < 0) | |
112 | cytherm->brightness = 0; | |
113 | ||
114 | /* Set brightness */ | |
115 | retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS, | |
116 | cytherm->brightness, buffer, 8); | |
117 | if (retval) | |
118 | dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); | |
96de0e25 | 119 | /* Inform µC that we have changed the brightness setting */ |
1da177e4 LT |
120 | retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS_SEM, |
121 | 0x01, buffer, 8); | |
122 | if (retval) | |
123 | dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); | |
124 | ||
125 | kfree(buffer); | |
126 | ||
127 | return count; | |
128 | } | |
129 | ||
130 | static DEVICE_ATTR(brightness, S_IRUGO | S_IWUSR | S_IWGRP, | |
131 | show_brightness, set_brightness); | |
132 | ||
133 | ||
134 | #define TEMP 0x33 /* RAM location for temperature */ | |
135 | #define SIGN 0x34 /* RAM location for temperature sign */ | |
136 | ||
060b8845 | 137 | static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
138 | { |
139 | ||
140 | struct usb_interface *intf = to_usb_interface(dev); | |
141 | struct usb_cytherm *cytherm = usb_get_intfdata(intf); | |
142 | ||
143 | int retval; | |
144 | unsigned char *buffer; | |
145 | ||
146 | int temp, sign; | |
147 | ||
148 | buffer = kmalloc(8, GFP_KERNEL); | |
29a99df1 | 149 | if (!buffer) |
1da177e4 | 150 | return 0; |
1da177e4 LT |
151 | |
152 | /* read temperature */ | |
153 | retval = vendor_command(cytherm->udev, READ_RAM, TEMP, 0, buffer, 8); | |
154 | if (retval) | |
155 | dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); | |
156 | temp = buffer[1]; | |
157 | ||
158 | /* read sign */ | |
159 | retval = vendor_command(cytherm->udev, READ_RAM, SIGN, 0, buffer, 8); | |
160 | if (retval) | |
161 | dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); | |
162 | sign = buffer[1]; | |
163 | ||
164 | kfree(buffer); | |
165 | ||
166 | return sprintf(buf, "%c%i.%i", sign ? '-' : '+', temp >> 1, | |
167 | 5*(temp - ((temp >> 1) << 1))); | |
168 | } | |
169 | ||
170 | ||
060b8845 | 171 | static ssize_t set_temp(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
172 | { |
173 | return count; | |
174 | } | |
175 | ||
176 | static DEVICE_ATTR(temp, S_IRUGO, show_temp, set_temp); | |
177 | ||
178 | ||
179 | #define BUTTON 0x7a | |
180 | ||
060b8845 | 181 | static ssize_t show_button(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
182 | { |
183 | ||
184 | struct usb_interface *intf = to_usb_interface(dev); | |
185 | struct usb_cytherm *cytherm = usb_get_intfdata(intf); | |
186 | ||
187 | int retval; | |
188 | unsigned char *buffer; | |
189 | ||
190 | buffer = kmalloc(8, GFP_KERNEL); | |
29a99df1 | 191 | if (!buffer) |
1da177e4 | 192 | return 0; |
1da177e4 LT |
193 | |
194 | /* check button */ | |
195 | retval = vendor_command(cytherm->udev, READ_RAM, BUTTON, 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 | if (retval) | |
204 | return sprintf(buf, "1"); | |
205 | else | |
206 | return sprintf(buf, "0"); | |
207 | } | |
208 | ||
209 | ||
060b8845 | 210 | static ssize_t set_button(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
211 | { |
212 | return count; | |
213 | } | |
214 | ||
215 | static DEVICE_ATTR(button, S_IRUGO, show_button, set_button); | |
216 | ||
217 | ||
060b8845 | 218 | static ssize_t show_port0(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
219 | { |
220 | struct usb_interface *intf = to_usb_interface(dev); | |
221 | struct usb_cytherm *cytherm = usb_get_intfdata(intf); | |
222 | ||
223 | int retval; | |
224 | unsigned char *buffer; | |
225 | ||
226 | buffer = kmalloc(8, GFP_KERNEL); | |
29a99df1 | 227 | if (!buffer) |
1da177e4 | 228 | return 0; |
1da177e4 LT |
229 | |
230 | retval = vendor_command(cytherm->udev, READ_PORT, 0, 0, buffer, 8); | |
231 | if (retval) | |
232 | dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); | |
233 | ||
234 | retval = buffer[1]; | |
235 | ||
236 | kfree(buffer); | |
237 | ||
238 | return sprintf(buf, "%d", retval); | |
239 | } | |
240 | ||
241 | ||
060b8845 | 242 | static ssize_t set_port0(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
243 | { |
244 | struct usb_interface *intf = to_usb_interface(dev); | |
245 | struct usb_cytherm *cytherm = usb_get_intfdata(intf); | |
246 | ||
247 | unsigned char *buffer; | |
248 | int retval; | |
249 | int tmp; | |
250 | ||
251 | buffer = kmalloc(8, GFP_KERNEL); | |
29a99df1 | 252 | if (!buffer) |
1da177e4 | 253 | return 0; |
1da177e4 LT |
254 | |
255 | tmp = simple_strtoul(buf, NULL, 10); | |
256 | ||
257 | if (tmp > 0xFF) | |
258 | tmp = 0xFF; | |
259 | else if (tmp < 0) | |
260 | tmp = 0; | |
261 | ||
262 | retval = vendor_command(cytherm->udev, WRITE_PORT, 0, | |
263 | tmp, buffer, 8); | |
264 | if (retval) | |
265 | dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); | |
266 | ||
267 | kfree(buffer); | |
268 | ||
269 | return count; | |
270 | } | |
271 | ||
272 | static DEVICE_ATTR(port0, S_IRUGO | S_IWUSR | S_IWGRP, show_port0, set_port0); | |
273 | ||
060b8845 | 274 | static ssize_t show_port1(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
275 | { |
276 | struct usb_interface *intf = to_usb_interface(dev); | |
277 | struct usb_cytherm *cytherm = usb_get_intfdata(intf); | |
278 | ||
279 | int retval; | |
280 | unsigned char *buffer; | |
281 | ||
282 | buffer = kmalloc(8, GFP_KERNEL); | |
29a99df1 | 283 | if (!buffer) |
1da177e4 | 284 | return 0; |
1da177e4 LT |
285 | |
286 | retval = vendor_command(cytherm->udev, READ_PORT, 1, 0, buffer, 8); | |
287 | if (retval) | |
288 | dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); | |
289 | ||
290 | retval = buffer[1]; | |
291 | ||
292 | kfree(buffer); | |
293 | ||
294 | return sprintf(buf, "%d", retval); | |
295 | } | |
296 | ||
297 | ||
060b8845 | 298 | static ssize_t set_port1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
299 | { |
300 | struct usb_interface *intf = to_usb_interface(dev); | |
301 | struct usb_cytherm *cytherm = usb_get_intfdata(intf); | |
302 | ||
303 | unsigned char *buffer; | |
304 | int retval; | |
305 | int tmp; | |
306 | ||
307 | buffer = kmalloc(8, GFP_KERNEL); | |
29a99df1 | 308 | if (!buffer) |
1da177e4 | 309 | return 0; |
1da177e4 LT |
310 | |
311 | tmp = simple_strtoul(buf, NULL, 10); | |
312 | ||
313 | if (tmp > 0xFF) | |
314 | tmp = 0xFF; | |
315 | else if (tmp < 0) | |
316 | tmp = 0; | |
317 | ||
318 | retval = vendor_command(cytherm->udev, WRITE_PORT, 1, | |
319 | tmp, buffer, 8); | |
320 | if (retval) | |
321 | dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval); | |
322 | ||
323 | kfree(buffer); | |
324 | ||
325 | return count; | |
326 | } | |
327 | ||
328 | static DEVICE_ATTR(port1, S_IRUGO | S_IWUSR | S_IWGRP, show_port1, set_port1); | |
329 | ||
330 | ||
331 | ||
332 | static int cytherm_probe(struct usb_interface *interface, | |
333 | const struct usb_device_id *id) | |
334 | { | |
335 | struct usb_device *udev = interface_to_usbdev(interface); | |
336 | struct usb_cytherm *dev = NULL; | |
337 | int retval = -ENOMEM; | |
338 | ||
5f748133 | 339 | dev = kzalloc (sizeof(struct usb_cytherm), GFP_KERNEL); |
29a99df1 | 340 | if (!dev) |
4d42e1bb | 341 | goto error_mem; |
1da177e4 LT |
342 | |
343 | dev->udev = usb_get_dev(udev); | |
344 | ||
345 | usb_set_intfdata (interface, dev); | |
346 | ||
347 | dev->brightness = 0xFF; | |
348 | ||
4d42e1bb GKH |
349 | retval = device_create_file(&interface->dev, &dev_attr_brightness); |
350 | if (retval) | |
351 | goto error; | |
352 | retval = device_create_file(&interface->dev, &dev_attr_temp); | |
353 | if (retval) | |
354 | goto error; | |
355 | retval = device_create_file(&interface->dev, &dev_attr_button); | |
356 | if (retval) | |
357 | goto error; | |
358 | retval = device_create_file(&interface->dev, &dev_attr_port0); | |
359 | if (retval) | |
360 | goto error; | |
361 | retval = device_create_file(&interface->dev, &dev_attr_port1); | |
362 | if (retval) | |
363 | goto error; | |
1da177e4 | 364 | |
4d42e1bb | 365 | dev_info (&interface->dev, |
1da177e4 LT |
366 | "Cypress thermometer device now attached\n"); |
367 | return 0; | |
4d42e1bb GKH |
368 | error: |
369 | device_remove_file(&interface->dev, &dev_attr_brightness); | |
370 | device_remove_file(&interface->dev, &dev_attr_temp); | |
371 | device_remove_file(&interface->dev, &dev_attr_button); | |
372 | device_remove_file(&interface->dev, &dev_attr_port0); | |
373 | device_remove_file(&interface->dev, &dev_attr_port1); | |
374 | usb_set_intfdata (interface, NULL); | |
375 | usb_put_dev(dev->udev); | |
1da177e4 | 376 | kfree(dev); |
4d42e1bb | 377 | error_mem: |
1da177e4 LT |
378 | return retval; |
379 | } | |
380 | ||
381 | static void cytherm_disconnect(struct usb_interface *interface) | |
382 | { | |
383 | struct usb_cytherm *dev; | |
384 | ||
385 | dev = usb_get_intfdata (interface); | |
1da177e4 LT |
386 | |
387 | device_remove_file(&interface->dev, &dev_attr_brightness); | |
388 | device_remove_file(&interface->dev, &dev_attr_temp); | |
389 | device_remove_file(&interface->dev, &dev_attr_button); | |
390 | device_remove_file(&interface->dev, &dev_attr_port0); | |
391 | device_remove_file(&interface->dev, &dev_attr_port1); | |
392 | ||
d718d2b1 ON |
393 | /* first remove the files, then NULL the pointer */ |
394 | usb_set_intfdata (interface, NULL); | |
395 | ||
1da177e4 LT |
396 | usb_put_dev(dev->udev); |
397 | ||
398 | kfree(dev); | |
399 | ||
400 | dev_info(&interface->dev, "Cypress thermometer now disconnected\n"); | |
401 | } | |
402 | ||
65db4305 | 403 | module_usb_driver(cytherm_driver); |
1da177e4 LT |
404 | |
405 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
406 | MODULE_DESCRIPTION(DRIVER_DESC); | |
407 | MODULE_LICENSE("GPL"); |