]>
Commit | Line | Data |
---|---|---|
9cb7d184 SW |
1 | /* |
2 | atxp1.c - kernel module for setting CPU VID and general purpose | |
3 | I/Os using the Attansic ATXP1 chip. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | ||
19 | */ | |
20 | ||
21 | #include <linux/kernel.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
0cacdf29 | 24 | #include <linux/jiffies.h> |
9cb7d184 | 25 | #include <linux/i2c.h> |
943b0830 | 26 | #include <linux/hwmon.h> |
303760b4 | 27 | #include <linux/hwmon-vid.h> |
943b0830 | 28 | #include <linux/err.h> |
9a61bf63 | 29 | #include <linux/mutex.h> |
a5ebe668 | 30 | #include <linux/sysfs.h> |
9cb7d184 SW |
31 | |
32 | MODULE_LICENSE("GPL"); | |
33 | MODULE_DESCRIPTION("System voltages control via Attansic ATXP1"); | |
13b3c3fa | 34 | MODULE_VERSION("0.6.3"); |
9cb7d184 SW |
35 | MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>"); |
36 | ||
37 | #define ATXP1_VID 0x00 | |
38 | #define ATXP1_CVID 0x01 | |
39 | #define ATXP1_GPIO1 0x06 | |
40 | #define ATXP1_GPIO2 0x0a | |
41 | #define ATXP1_VIDENA 0x20 | |
42 | #define ATXP1_VIDMASK 0x1f | |
43 | #define ATXP1_GPIO1MASK 0x0f | |
44 | ||
25e9c86d | 45 | static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END }; |
9cb7d184 | 46 | |
f4b50261 | 47 | I2C_CLIENT_INSMOD_1(atxp1); |
9cb7d184 | 48 | |
71163c7c JD |
49 | static int atxp1_probe(struct i2c_client *client, |
50 | const struct i2c_device_id *id); | |
51 | static int atxp1_remove(struct i2c_client *client); | |
9cb7d184 | 52 | static struct atxp1_data * atxp1_update_device(struct device *dev); |
71163c7c JD |
53 | static int atxp1_detect(struct i2c_client *client, int kind, |
54 | struct i2c_board_info *info); | |
55 | ||
56 | static const struct i2c_device_id atxp1_id[] = { | |
57 | { "atxp1", atxp1 }, | |
58 | { } | |
59 | }; | |
60 | MODULE_DEVICE_TABLE(i2c, atxp1_id); | |
9cb7d184 SW |
61 | |
62 | static struct i2c_driver atxp1_driver = { | |
71163c7c | 63 | .class = I2C_CLASS_HWMON, |
cdaf7934 | 64 | .driver = { |
cdaf7934 LR |
65 | .name = "atxp1", |
66 | }, | |
71163c7c JD |
67 | .probe = atxp1_probe, |
68 | .remove = atxp1_remove, | |
69 | .id_table = atxp1_id, | |
70 | .detect = atxp1_detect, | |
71 | .address_data = &addr_data, | |
9cb7d184 SW |
72 | }; |
73 | ||
74 | struct atxp1_data { | |
1beeffe4 | 75 | struct device *hwmon_dev; |
9a61bf63 | 76 | struct mutex update_lock; |
9cb7d184 SW |
77 | unsigned long last_updated; |
78 | u8 valid; | |
79 | struct { | |
80 | u8 vid; /* VID output register */ | |
81 | u8 cpu_vid; /* VID input from CPU */ | |
82 | u8 gpio1; /* General purpose I/O register 1 */ | |
83 | u8 gpio2; /* General purpose I/O register 2 */ | |
84 | } reg; | |
85 | u8 vrm; /* Detected CPU VRM */ | |
86 | }; | |
87 | ||
88 | static struct atxp1_data * atxp1_update_device(struct device *dev) | |
89 | { | |
90 | struct i2c_client *client; | |
91 | struct atxp1_data *data; | |
92 | ||
93 | client = to_i2c_client(dev); | |
94 | data = i2c_get_clientdata(client); | |
95 | ||
9a61bf63 | 96 | mutex_lock(&data->update_lock); |
9cb7d184 | 97 | |
0cacdf29 | 98 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
9cb7d184 SW |
99 | |
100 | /* Update local register data */ | |
101 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
102 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID); | |
103 | data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1); | |
104 | data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2); | |
105 | ||
106 | data->valid = 1; | |
107 | } | |
108 | ||
9a61bf63 | 109 | mutex_unlock(&data->update_lock); |
9cb7d184 SW |
110 | |
111 | return(data); | |
112 | } | |
113 | ||
114 | /* sys file functions for cpu0_vid */ | |
6f637a64 | 115 | static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
116 | { |
117 | int size; | |
118 | struct atxp1_data *data; | |
119 | ||
120 | data = atxp1_update_device(dev); | |
121 | ||
122 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm)); | |
123 | ||
124 | return size; | |
125 | } | |
126 | ||
6f637a64 | 127 | static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
9cb7d184 SW |
128 | { |
129 | struct atxp1_data *data; | |
130 | struct i2c_client *client; | |
c41bdb52 | 131 | int vid, cvid; |
9cb7d184 SW |
132 | unsigned int vcore; |
133 | ||
134 | client = to_i2c_client(dev); | |
135 | data = atxp1_update_device(dev); | |
136 | ||
137 | vcore = simple_strtoul(buf, NULL, 10); | |
138 | vcore /= 25; | |
139 | vcore *= 25; | |
140 | ||
141 | /* Calculate VID */ | |
142 | vid = vid_to_reg(vcore, data->vrm); | |
143 | ||
144 | if (vid < 0) { | |
145 | dev_err(dev, "VID calculation failed.\n"); | |
146 | return -1; | |
147 | } | |
148 | ||
149 | /* If output enabled, use control register value. Otherwise original CPU VID */ | |
150 | if (data->reg.vid & ATXP1_VIDENA) | |
151 | cvid = data->reg.vid & ATXP1_VIDMASK; | |
152 | else | |
153 | cvid = data->reg.cpu_vid; | |
154 | ||
155 | /* Nothing changed, aborting */ | |
156 | if (vid == cvid) | |
157 | return count; | |
158 | ||
164cad9b | 159 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid); |
9cb7d184 SW |
160 | |
161 | /* Write every 25 mV step to increase stability */ | |
162 | if (cvid > vid) { | |
163 | for (; cvid >= vid; cvid--) { | |
164 | i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA); | |
165 | } | |
166 | } | |
167 | else { | |
168 | for (; cvid <= vid; cvid++) { | |
169 | i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA); | |
170 | } | |
171 | } | |
172 | ||
173 | data->valid = 0; | |
174 | ||
175 | return count; | |
176 | } | |
177 | ||
178 | /* CPU core reference voltage | |
179 | unit: millivolt | |
180 | */ | |
181 | static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore); | |
182 | ||
183 | /* sys file functions for GPIO1 */ | |
6f637a64 | 184 | static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
185 | { |
186 | int size; | |
187 | struct atxp1_data *data; | |
188 | ||
189 | data = atxp1_update_device(dev); | |
190 | ||
191 | size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK); | |
192 | ||
193 | return size; | |
194 | } | |
195 | ||
6f637a64 | 196 | static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, const char*buf, size_t count) |
9cb7d184 SW |
197 | { |
198 | struct atxp1_data *data; | |
199 | struct i2c_client *client; | |
200 | unsigned int value; | |
201 | ||
202 | client = to_i2c_client(dev); | |
203 | data = atxp1_update_device(dev); | |
204 | ||
205 | value = simple_strtoul(buf, NULL, 16); | |
206 | ||
207 | value &= ATXP1_GPIO1MASK; | |
208 | ||
209 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
210 | dev_info(dev, "Writing 0x%x to GPIO1.\n", value); | |
211 | ||
212 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
213 | ||
214 | data->valid = 0; | |
215 | } | |
216 | ||
217 | return count; | |
218 | } | |
219 | ||
220 | /* GPIO1 data register | |
221 | unit: Four bit as hex (e.g. 0x0f) | |
222 | */ | |
223 | static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1); | |
224 | ||
225 | /* sys file functions for GPIO2 */ | |
6f637a64 | 226 | static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
227 | { |
228 | int size; | |
229 | struct atxp1_data *data; | |
230 | ||
231 | data = atxp1_update_device(dev); | |
232 | ||
233 | size = sprintf(buf, "0x%02x\n", data->reg.gpio2); | |
234 | ||
235 | return size; | |
236 | } | |
237 | ||
6f637a64 | 238 | static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
9cb7d184 SW |
239 | { |
240 | struct atxp1_data *data; | |
241 | struct i2c_client *client; | |
242 | unsigned int value; | |
243 | ||
244 | client = to_i2c_client(dev); | |
245 | data = atxp1_update_device(dev); | |
246 | ||
247 | value = simple_strtoul(buf, NULL, 16) & 0xff; | |
248 | ||
249 | if (value != data->reg.gpio2) { | |
250 | dev_info(dev, "Writing 0x%x to GPIO1.\n", value); | |
251 | ||
252 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
253 | ||
254 | data->valid = 0; | |
255 | } | |
256 | ||
257 | return count; | |
258 | } | |
259 | ||
260 | /* GPIO2 data register | |
261 | unit: Eight bit as hex (e.g. 0xff) | |
262 | */ | |
263 | static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2); | |
264 | ||
a5ebe668 JD |
265 | static struct attribute *atxp1_attributes[] = { |
266 | &dev_attr_gpio1.attr, | |
267 | &dev_attr_gpio2.attr, | |
268 | &dev_attr_cpu0_vid.attr, | |
269 | NULL | |
270 | }; | |
271 | ||
272 | static const struct attribute_group atxp1_group = { | |
273 | .attrs = atxp1_attributes, | |
274 | }; | |
275 | ||
9cb7d184 | 276 | |
71163c7c JD |
277 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
278 | static int atxp1_detect(struct i2c_client *new_client, int kind, | |
279 | struct i2c_board_info *info) | |
9cb7d184 | 280 | { |
71163c7c | 281 | struct i2c_adapter *adapter = new_client->adapter; |
9cb7d184 | 282 | |
9cb7d184 SW |
283 | u8 temp; |
284 | ||
285 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
71163c7c | 286 | return -ENODEV; |
9cb7d184 SW |
287 | |
288 | /* Detect ATXP1, checking if vendor ID registers are all zero */ | |
289 | if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) && | |
290 | (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) && | |
291 | (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) && | |
13b3c3fa JD |
292 | (i2c_smbus_read_byte_data(new_client, 0xff) == 0))) |
293 | return -ENODEV; | |
9cb7d184 | 294 | |
13b3c3fa JD |
295 | /* No vendor ID, now checking if registers 0x10,0x11 (non-existent) |
296 | * showing the same as register 0x00 */ | |
297 | temp = i2c_smbus_read_byte_data(new_client, 0x00); | |
9cb7d184 | 298 | |
13b3c3fa JD |
299 | if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) && |
300 | (i2c_smbus_read_byte_data(new_client, 0x11) == temp))) | |
301 | return -ENODEV; | |
9cb7d184 SW |
302 | |
303 | /* Get VRM */ | |
71163c7c | 304 | temp = vid_which_vrm(); |
9cb7d184 | 305 | |
71163c7c JD |
306 | if ((temp != 90) && (temp != 91)) { |
307 | dev_err(&adapter->dev, "atxp1: Not supporting VRM %d.%d\n", | |
308 | temp / 10, temp % 10); | |
309 | return -ENODEV; | |
9cb7d184 SW |
310 | } |
311 | ||
71163c7c | 312 | strlcpy(info->type, "atxp1", I2C_NAME_SIZE); |
9cb7d184 | 313 | |
71163c7c JD |
314 | return 0; |
315 | } | |
9cb7d184 | 316 | |
71163c7c JD |
317 | static int atxp1_probe(struct i2c_client *new_client, |
318 | const struct i2c_device_id *id) | |
319 | { | |
320 | struct atxp1_data *data; | |
321 | int err; | |
9cb7d184 | 322 | |
71163c7c JD |
323 | data = kzalloc(sizeof(struct atxp1_data), GFP_KERNEL); |
324 | if (!data) { | |
325 | err = -ENOMEM; | |
326 | goto exit; | |
9cb7d184 SW |
327 | } |
328 | ||
71163c7c JD |
329 | /* Get VRM */ |
330 | data->vrm = vid_which_vrm(); | |
331 | ||
332 | i2c_set_clientdata(new_client, data); | |
333 | data->valid = 0; | |
334 | ||
335 | mutex_init(&data->update_lock); | |
336 | ||
a5ebe668 JD |
337 | /* Register sysfs hooks */ |
338 | if ((err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group))) | |
71163c7c | 339 | goto exit_free; |
a5ebe668 | 340 | |
1beeffe4 TJ |
341 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
342 | if (IS_ERR(data->hwmon_dev)) { | |
343 | err = PTR_ERR(data->hwmon_dev); | |
a5ebe668 | 344 | goto exit_remove_files; |
943b0830 MH |
345 | } |
346 | ||
9cb7d184 SW |
347 | dev_info(&new_client->dev, "Using VRM: %d.%d\n", |
348 | data->vrm / 10, data->vrm % 10); | |
349 | ||
350 | return 0; | |
351 | ||
a5ebe668 JD |
352 | exit_remove_files: |
353 | sysfs_remove_group(&new_client->dev.kobj, &atxp1_group); | |
9cb7d184 SW |
354 | exit_free: |
355 | kfree(data); | |
356 | exit: | |
357 | return err; | |
358 | }; | |
359 | ||
71163c7c | 360 | static int atxp1_remove(struct i2c_client *client) |
9cb7d184 | 361 | { |
943b0830 | 362 | struct atxp1_data * data = i2c_get_clientdata(client); |
9cb7d184 | 363 | |
1beeffe4 | 364 | hwmon_device_unregister(data->hwmon_dev); |
a5ebe668 | 365 | sysfs_remove_group(&client->dev.kobj, &atxp1_group); |
943b0830 | 366 | |
71163c7c | 367 | kfree(data); |
9cb7d184 | 368 | |
71163c7c | 369 | return 0; |
9cb7d184 SW |
370 | }; |
371 | ||
372 | static int __init atxp1_init(void) | |
373 | { | |
374 | return i2c_add_driver(&atxp1_driver); | |
375 | }; | |
376 | ||
377 | static void __exit atxp1_exit(void) | |
378 | { | |
379 | i2c_del_driver(&atxp1_driver); | |
380 | }; | |
381 | ||
382 | module_init(atxp1_init); | |
383 | module_exit(atxp1_exit); |