Commit | Line | Data |
---|---|---|
9cb7d184 | 1 | /* |
f24d548b GR |
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 | */ | |
9cb7d184 SW |
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> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
9cb7d184 SW |
32 | |
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_DESCRIPTION("System voltages control via Attansic ATXP1"); | |
13b3c3fa | 35 | MODULE_VERSION("0.6.3"); |
9cb7d184 SW |
36 | MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>"); |
37 | ||
38 | #define ATXP1_VID 0x00 | |
39 | #define ATXP1_CVID 0x01 | |
40 | #define ATXP1_GPIO1 0x06 | |
41 | #define ATXP1_GPIO2 0x0a | |
42 | #define ATXP1_VIDENA 0x20 | |
43 | #define ATXP1_VIDMASK 0x1f | |
44 | #define ATXP1_GPIO1MASK 0x0f | |
45 | ||
25e9c86d | 46 | static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END }; |
9cb7d184 | 47 | |
71163c7c JD |
48 | static int atxp1_probe(struct i2c_client *client, |
49 | const struct i2c_device_id *id); | |
50 | static int atxp1_remove(struct i2c_client *client); | |
f24d548b | 51 | static struct atxp1_data *atxp1_update_device(struct device *dev); |
310ec792 | 52 | static int atxp1_detect(struct i2c_client *client, struct i2c_board_info *info); |
71163c7c JD |
53 | |
54 | static const struct i2c_device_id atxp1_id[] = { | |
1f86df49 | 55 | { "atxp1", 0 }, |
71163c7c JD |
56 | { } |
57 | }; | |
58 | MODULE_DEVICE_TABLE(i2c, atxp1_id); | |
9cb7d184 SW |
59 | |
60 | static struct i2c_driver atxp1_driver = { | |
71163c7c | 61 | .class = I2C_CLASS_HWMON, |
cdaf7934 | 62 | .driver = { |
cdaf7934 LR |
63 | .name = "atxp1", |
64 | }, | |
71163c7c JD |
65 | .probe = atxp1_probe, |
66 | .remove = atxp1_remove, | |
67 | .id_table = atxp1_id, | |
68 | .detect = atxp1_detect, | |
c3813d6a | 69 | .address_list = normal_i2c, |
9cb7d184 SW |
70 | }; |
71 | ||
72 | struct atxp1_data { | |
1beeffe4 | 73 | struct device *hwmon_dev; |
9a61bf63 | 74 | struct mutex update_lock; |
9cb7d184 SW |
75 | unsigned long last_updated; |
76 | u8 valid; | |
77 | struct { | |
78 | u8 vid; /* VID output register */ | |
79 | u8 cpu_vid; /* VID input from CPU */ | |
80 | u8 gpio1; /* General purpose I/O register 1 */ | |
81 | u8 gpio2; /* General purpose I/O register 2 */ | |
82 | } reg; | |
83 | u8 vrm; /* Detected CPU VRM */ | |
84 | }; | |
85 | ||
f24d548b | 86 | static struct atxp1_data *atxp1_update_device(struct device *dev) |
9cb7d184 SW |
87 | { |
88 | struct i2c_client *client; | |
89 | struct atxp1_data *data; | |
90 | ||
91 | client = to_i2c_client(dev); | |
92 | data = i2c_get_clientdata(client); | |
93 | ||
9a61bf63 | 94 | mutex_lock(&data->update_lock); |
9cb7d184 | 95 | |
0cacdf29 | 96 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
9cb7d184 SW |
97 | |
98 | /* Update local register data */ | |
99 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
f24d548b GR |
100 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, |
101 | ATXP1_CVID); | |
9cb7d184 SW |
102 | data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1); |
103 | data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2); | |
104 | ||
105 | data->valid = 1; | |
106 | } | |
107 | ||
9a61bf63 | 108 | mutex_unlock(&data->update_lock); |
9cb7d184 | 109 | |
7fe83ad8 | 110 | return data; |
9cb7d184 SW |
111 | } |
112 | ||
113 | /* sys file functions for cpu0_vid */ | |
f24d548b GR |
114 | static ssize_t atxp1_showvcore(struct device *dev, |
115 | 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 | ||
f24d548b GR |
122 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, |
123 | data->vrm)); | |
9cb7d184 SW |
124 | |
125 | return size; | |
126 | } | |
127 | ||
f24d548b GR |
128 | static ssize_t atxp1_storevcore(struct device *dev, |
129 | struct device_attribute *attr, | |
130 | const char *buf, size_t count) | |
9cb7d184 SW |
131 | { |
132 | struct atxp1_data *data; | |
133 | struct i2c_client *client; | |
c41bdb52 | 134 | int vid, cvid; |
f24d548b GR |
135 | unsigned long vcore; |
136 | int err; | |
9cb7d184 SW |
137 | |
138 | client = to_i2c_client(dev); | |
139 | data = atxp1_update_device(dev); | |
140 | ||
f24d548b GR |
141 | err = kstrtoul(buf, 10, &vcore); |
142 | if (err) | |
143 | return err; | |
144 | ||
9cb7d184 SW |
145 | vcore /= 25; |
146 | vcore *= 25; | |
147 | ||
148 | /* Calculate VID */ | |
149 | vid = vid_to_reg(vcore, data->vrm); | |
9cb7d184 SW |
150 | if (vid < 0) { |
151 | dev_err(dev, "VID calculation failed.\n"); | |
674d0ed8 | 152 | return vid; |
9cb7d184 SW |
153 | } |
154 | ||
f24d548b GR |
155 | /* |
156 | * If output enabled, use control register value. | |
157 | * Otherwise original CPU VID | |
158 | */ | |
9cb7d184 SW |
159 | if (data->reg.vid & ATXP1_VIDENA) |
160 | cvid = data->reg.vid & ATXP1_VIDMASK; | |
161 | else | |
162 | cvid = data->reg.cpu_vid; | |
163 | ||
164 | /* Nothing changed, aborting */ | |
165 | if (vid == cvid) | |
166 | return count; | |
167 | ||
f24d548b | 168 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", (int)vcore, vid); |
9cb7d184 SW |
169 | |
170 | /* Write every 25 mV step to increase stability */ | |
171 | if (cvid > vid) { | |
f24d548b GR |
172 | for (; cvid >= vid; cvid--) |
173 | i2c_smbus_write_byte_data(client, | |
174 | ATXP1_VID, cvid | ATXP1_VIDENA); | |
175 | } else { | |
176 | for (; cvid <= vid; cvid++) | |
177 | i2c_smbus_write_byte_data(client, | |
178 | ATXP1_VID, cvid | ATXP1_VIDENA); | |
9cb7d184 SW |
179 | } |
180 | ||
181 | data->valid = 0; | |
182 | ||
183 | return count; | |
184 | } | |
185 | ||
f24d548b GR |
186 | /* |
187 | * CPU core reference voltage | |
188 | * unit: millivolt | |
189 | */ | |
190 | static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, | |
191 | atxp1_storevcore); | |
9cb7d184 SW |
192 | |
193 | /* sys file functions for GPIO1 */ | |
f24d548b GR |
194 | static ssize_t atxp1_showgpio1(struct device *dev, |
195 | struct device_attribute *attr, char *buf) | |
9cb7d184 SW |
196 | { |
197 | int size; | |
198 | struct atxp1_data *data; | |
199 | ||
200 | data = atxp1_update_device(dev); | |
201 | ||
202 | size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK); | |
203 | ||
204 | return size; | |
205 | } | |
206 | ||
f24d548b GR |
207 | static ssize_t atxp1_storegpio1(struct device *dev, |
208 | struct device_attribute *attr, const char *buf, | |
209 | size_t count) | |
9cb7d184 SW |
210 | { |
211 | struct atxp1_data *data; | |
212 | struct i2c_client *client; | |
f24d548b GR |
213 | unsigned long value; |
214 | int err; | |
9cb7d184 SW |
215 | |
216 | client = to_i2c_client(dev); | |
217 | data = atxp1_update_device(dev); | |
218 | ||
f24d548b GR |
219 | err = kstrtoul(buf, 16, &value); |
220 | if (err) | |
221 | return err; | |
9cb7d184 SW |
222 | |
223 | value &= ATXP1_GPIO1MASK; | |
224 | ||
225 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
f24d548b | 226 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); |
9cb7d184 SW |
227 | |
228 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
229 | ||
230 | data->valid = 0; | |
231 | } | |
232 | ||
233 | return count; | |
234 | } | |
235 | ||
f24d548b GR |
236 | /* |
237 | * GPIO1 data register | |
238 | * unit: Four bit as hex (e.g. 0x0f) | |
239 | */ | |
9cb7d184 SW |
240 | static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1); |
241 | ||
242 | /* sys file functions for GPIO2 */ | |
f24d548b GR |
243 | static ssize_t atxp1_showgpio2(struct device *dev, |
244 | struct device_attribute *attr, char *buf) | |
9cb7d184 SW |
245 | { |
246 | int size; | |
247 | struct atxp1_data *data; | |
248 | ||
249 | data = atxp1_update_device(dev); | |
250 | ||
251 | size = sprintf(buf, "0x%02x\n", data->reg.gpio2); | |
252 | ||
253 | return size; | |
254 | } | |
255 | ||
f24d548b GR |
256 | static ssize_t atxp1_storegpio2(struct device *dev, |
257 | struct device_attribute *attr, | |
258 | const char *buf, size_t count) | |
9cb7d184 | 259 | { |
f24d548b GR |
260 | struct atxp1_data *data = atxp1_update_device(dev); |
261 | struct i2c_client *client = to_i2c_client(dev); | |
262 | unsigned long value; | |
263 | int err; | |
9cb7d184 | 264 | |
f24d548b GR |
265 | err = kstrtoul(buf, 16, &value); |
266 | if (err) | |
267 | return err; | |
268 | value &= 0xff; | |
9cb7d184 SW |
269 | |
270 | if (value != data->reg.gpio2) { | |
f24d548b | 271 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); |
9cb7d184 SW |
272 | |
273 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
274 | ||
275 | data->valid = 0; | |
276 | } | |
277 | ||
278 | return count; | |
279 | } | |
280 | ||
f24d548b GR |
281 | /* |
282 | * GPIO2 data register | |
283 | * unit: Eight bit as hex (e.g. 0xff) | |
284 | */ | |
9cb7d184 SW |
285 | static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2); |
286 | ||
a5ebe668 JD |
287 | static struct attribute *atxp1_attributes[] = { |
288 | &dev_attr_gpio1.attr, | |
289 | &dev_attr_gpio2.attr, | |
290 | &dev_attr_cpu0_vid.attr, | |
291 | NULL | |
292 | }; | |
293 | ||
294 | static const struct attribute_group atxp1_group = { | |
295 | .attrs = atxp1_attributes, | |
296 | }; | |
297 | ||
9cb7d184 | 298 | |
71163c7c | 299 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 300 | static int atxp1_detect(struct i2c_client *new_client, |
71163c7c | 301 | struct i2c_board_info *info) |
9cb7d184 | 302 | { |
71163c7c | 303 | struct i2c_adapter *adapter = new_client->adapter; |
9cb7d184 | 304 | |
9cb7d184 SW |
305 | u8 temp; |
306 | ||
307 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
71163c7c | 308 | return -ENODEV; |
9cb7d184 SW |
309 | |
310 | /* Detect ATXP1, checking if vendor ID registers are all zero */ | |
311 | if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) && | |
312 | (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) && | |
313 | (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) && | |
13b3c3fa JD |
314 | (i2c_smbus_read_byte_data(new_client, 0xff) == 0))) |
315 | return -ENODEV; | |
9cb7d184 | 316 | |
f24d548b GR |
317 | /* |
318 | * No vendor ID, now checking if registers 0x10,0x11 (non-existent) | |
319 | * showing the same as register 0x00 | |
320 | */ | |
13b3c3fa | 321 | temp = i2c_smbus_read_byte_data(new_client, 0x00); |
9cb7d184 | 322 | |
13b3c3fa JD |
323 | if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) && |
324 | (i2c_smbus_read_byte_data(new_client, 0x11) == temp))) | |
325 | return -ENODEV; | |
9cb7d184 SW |
326 | |
327 | /* Get VRM */ | |
71163c7c | 328 | temp = vid_which_vrm(); |
9cb7d184 | 329 | |
71163c7c JD |
330 | if ((temp != 90) && (temp != 91)) { |
331 | dev_err(&adapter->dev, "atxp1: Not supporting VRM %d.%d\n", | |
332 | temp / 10, temp % 10); | |
333 | return -ENODEV; | |
9cb7d184 SW |
334 | } |
335 | ||
71163c7c | 336 | strlcpy(info->type, "atxp1", I2C_NAME_SIZE); |
9cb7d184 | 337 | |
71163c7c JD |
338 | return 0; |
339 | } | |
9cb7d184 | 340 | |
71163c7c JD |
341 | static int atxp1_probe(struct i2c_client *new_client, |
342 | const struct i2c_device_id *id) | |
343 | { | |
344 | struct atxp1_data *data; | |
345 | int err; | |
9cb7d184 | 346 | |
d466a353 GR |
347 | data = devm_kzalloc(&new_client->dev, sizeof(struct atxp1_data), |
348 | GFP_KERNEL); | |
349 | if (!data) | |
350 | return -ENOMEM; | |
9cb7d184 | 351 | |
71163c7c JD |
352 | /* Get VRM */ |
353 | data->vrm = vid_which_vrm(); | |
354 | ||
355 | i2c_set_clientdata(new_client, data); | |
356 | data->valid = 0; | |
357 | ||
358 | mutex_init(&data->update_lock); | |
359 | ||
a5ebe668 | 360 | /* Register sysfs hooks */ |
f24d548b GR |
361 | err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group); |
362 | if (err) | |
d466a353 | 363 | return err; |
a5ebe668 | 364 | |
1beeffe4 TJ |
365 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
366 | if (IS_ERR(data->hwmon_dev)) { | |
367 | err = PTR_ERR(data->hwmon_dev); | |
a5ebe668 | 368 | goto exit_remove_files; |
943b0830 MH |
369 | } |
370 | ||
9cb7d184 SW |
371 | dev_info(&new_client->dev, "Using VRM: %d.%d\n", |
372 | data->vrm / 10, data->vrm % 10); | |
373 | ||
374 | return 0; | |
375 | ||
a5ebe668 JD |
376 | exit_remove_files: |
377 | sysfs_remove_group(&new_client->dev.kobj, &atxp1_group); | |
9cb7d184 SW |
378 | return err; |
379 | }; | |
380 | ||
71163c7c | 381 | static int atxp1_remove(struct i2c_client *client) |
9cb7d184 | 382 | { |
f24d548b | 383 | struct atxp1_data *data = i2c_get_clientdata(client); |
9cb7d184 | 384 | |
1beeffe4 | 385 | hwmon_device_unregister(data->hwmon_dev); |
a5ebe668 | 386 | sysfs_remove_group(&client->dev.kobj, &atxp1_group); |
943b0830 | 387 | |
71163c7c | 388 | return 0; |
9cb7d184 SW |
389 | }; |
390 | ||
f0967eea | 391 | module_i2c_driver(atxp1_driver); |