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Commit | Line | Data |
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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 | |
71163c7c JD |
47 | static int atxp1_probe(struct i2c_client *client, |
48 | const struct i2c_device_id *id); | |
49 | static int atxp1_remove(struct i2c_client *client); | |
9cb7d184 | 50 | static struct atxp1_data * atxp1_update_device(struct device *dev); |
310ec792 | 51 | static int atxp1_detect(struct i2c_client *client, struct i2c_board_info *info); |
71163c7c JD |
52 | |
53 | static const struct i2c_device_id atxp1_id[] = { | |
1f86df49 | 54 | { "atxp1", 0 }, |
71163c7c JD |
55 | { } |
56 | }; | |
57 | MODULE_DEVICE_TABLE(i2c, atxp1_id); | |
9cb7d184 SW |
58 | |
59 | static struct i2c_driver atxp1_driver = { | |
71163c7c | 60 | .class = I2C_CLASS_HWMON, |
cdaf7934 | 61 | .driver = { |
cdaf7934 LR |
62 | .name = "atxp1", |
63 | }, | |
71163c7c JD |
64 | .probe = atxp1_probe, |
65 | .remove = atxp1_remove, | |
66 | .id_table = atxp1_id, | |
67 | .detect = atxp1_detect, | |
c3813d6a | 68 | .address_list = normal_i2c, |
9cb7d184 SW |
69 | }; |
70 | ||
71 | struct atxp1_data { | |
1beeffe4 | 72 | struct device *hwmon_dev; |
9a61bf63 | 73 | struct mutex update_lock; |
9cb7d184 SW |
74 | unsigned long last_updated; |
75 | u8 valid; | |
76 | struct { | |
77 | u8 vid; /* VID output register */ | |
78 | u8 cpu_vid; /* VID input from CPU */ | |
79 | u8 gpio1; /* General purpose I/O register 1 */ | |
80 | u8 gpio2; /* General purpose I/O register 2 */ | |
81 | } reg; | |
82 | u8 vrm; /* Detected CPU VRM */ | |
83 | }; | |
84 | ||
85 | static struct atxp1_data * atxp1_update_device(struct device *dev) | |
86 | { | |
87 | struct i2c_client *client; | |
88 | struct atxp1_data *data; | |
89 | ||
90 | client = to_i2c_client(dev); | |
91 | data = i2c_get_clientdata(client); | |
92 | ||
9a61bf63 | 93 | mutex_lock(&data->update_lock); |
9cb7d184 | 94 | |
0cacdf29 | 95 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
9cb7d184 SW |
96 | |
97 | /* Update local register data */ | |
98 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
99 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID); | |
100 | data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1); | |
101 | data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2); | |
102 | ||
103 | data->valid = 1; | |
104 | } | |
105 | ||
9a61bf63 | 106 | mutex_unlock(&data->update_lock); |
9cb7d184 SW |
107 | |
108 | return(data); | |
109 | } | |
110 | ||
111 | /* sys file functions for cpu0_vid */ | |
6f637a64 | 112 | static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
113 | { |
114 | int size; | |
115 | struct atxp1_data *data; | |
116 | ||
117 | data = atxp1_update_device(dev); | |
118 | ||
119 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm)); | |
120 | ||
121 | return size; | |
122 | } | |
123 | ||
6f637a64 | 124 | static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
9cb7d184 SW |
125 | { |
126 | struct atxp1_data *data; | |
127 | struct i2c_client *client; | |
c41bdb52 | 128 | int vid, cvid; |
9cb7d184 SW |
129 | unsigned int vcore; |
130 | ||
131 | client = to_i2c_client(dev); | |
132 | data = atxp1_update_device(dev); | |
133 | ||
134 | vcore = simple_strtoul(buf, NULL, 10); | |
135 | vcore /= 25; | |
136 | vcore *= 25; | |
137 | ||
138 | /* Calculate VID */ | |
139 | vid = vid_to_reg(vcore, data->vrm); | |
140 | ||
141 | if (vid < 0) { | |
142 | dev_err(dev, "VID calculation failed.\n"); | |
143 | return -1; | |
144 | } | |
145 | ||
146 | /* If output enabled, use control register value. Otherwise original CPU VID */ | |
147 | if (data->reg.vid & ATXP1_VIDENA) | |
148 | cvid = data->reg.vid & ATXP1_VIDMASK; | |
149 | else | |
150 | cvid = data->reg.cpu_vid; | |
151 | ||
152 | /* Nothing changed, aborting */ | |
153 | if (vid == cvid) | |
154 | return count; | |
155 | ||
164cad9b | 156 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid); |
9cb7d184 SW |
157 | |
158 | /* Write every 25 mV step to increase stability */ | |
159 | if (cvid > vid) { | |
160 | for (; cvid >= vid; cvid--) { | |
161 | i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA); | |
162 | } | |
163 | } | |
164 | else { | |
165 | for (; cvid <= vid; cvid++) { | |
166 | i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA); | |
167 | } | |
168 | } | |
169 | ||
170 | data->valid = 0; | |
171 | ||
172 | return count; | |
173 | } | |
174 | ||
175 | /* CPU core reference voltage | |
176 | unit: millivolt | |
177 | */ | |
178 | static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore); | |
179 | ||
180 | /* sys file functions for GPIO1 */ | |
6f637a64 | 181 | static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
182 | { |
183 | int size; | |
184 | struct atxp1_data *data; | |
185 | ||
186 | data = atxp1_update_device(dev); | |
187 | ||
188 | size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK); | |
189 | ||
190 | return size; | |
191 | } | |
192 | ||
6f637a64 | 193 | static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, const char*buf, size_t count) |
9cb7d184 SW |
194 | { |
195 | struct atxp1_data *data; | |
196 | struct i2c_client *client; | |
197 | unsigned int value; | |
198 | ||
199 | client = to_i2c_client(dev); | |
200 | data = atxp1_update_device(dev); | |
201 | ||
202 | value = simple_strtoul(buf, NULL, 16); | |
203 | ||
204 | value &= ATXP1_GPIO1MASK; | |
205 | ||
206 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
207 | dev_info(dev, "Writing 0x%x to GPIO1.\n", value); | |
208 | ||
209 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
210 | ||
211 | data->valid = 0; | |
212 | } | |
213 | ||
214 | return count; | |
215 | } | |
216 | ||
217 | /* GPIO1 data register | |
218 | unit: Four bit as hex (e.g. 0x0f) | |
219 | */ | |
220 | static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1); | |
221 | ||
222 | /* sys file functions for GPIO2 */ | |
6f637a64 | 223 | static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
224 | { |
225 | int size; | |
226 | struct atxp1_data *data; | |
227 | ||
228 | data = atxp1_update_device(dev); | |
229 | ||
230 | size = sprintf(buf, "0x%02x\n", data->reg.gpio2); | |
231 | ||
232 | return size; | |
233 | } | |
234 | ||
6f637a64 | 235 | static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
9cb7d184 SW |
236 | { |
237 | struct atxp1_data *data; | |
238 | struct i2c_client *client; | |
239 | unsigned int value; | |
240 | ||
241 | client = to_i2c_client(dev); | |
242 | data = atxp1_update_device(dev); | |
243 | ||
244 | value = simple_strtoul(buf, NULL, 16) & 0xff; | |
245 | ||
246 | if (value != data->reg.gpio2) { | |
247 | dev_info(dev, "Writing 0x%x to GPIO1.\n", value); | |
248 | ||
249 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
250 | ||
251 | data->valid = 0; | |
252 | } | |
253 | ||
254 | return count; | |
255 | } | |
256 | ||
257 | /* GPIO2 data register | |
258 | unit: Eight bit as hex (e.g. 0xff) | |
259 | */ | |
260 | static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2); | |
261 | ||
a5ebe668 JD |
262 | static struct attribute *atxp1_attributes[] = { |
263 | &dev_attr_gpio1.attr, | |
264 | &dev_attr_gpio2.attr, | |
265 | &dev_attr_cpu0_vid.attr, | |
266 | NULL | |
267 | }; | |
268 | ||
269 | static const struct attribute_group atxp1_group = { | |
270 | .attrs = atxp1_attributes, | |
271 | }; | |
272 | ||
9cb7d184 | 273 | |
71163c7c | 274 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 275 | static int atxp1_detect(struct i2c_client *new_client, |
71163c7c | 276 | struct i2c_board_info *info) |
9cb7d184 | 277 | { |
71163c7c | 278 | struct i2c_adapter *adapter = new_client->adapter; |
9cb7d184 | 279 | |
9cb7d184 SW |
280 | u8 temp; |
281 | ||
282 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
71163c7c | 283 | return -ENODEV; |
9cb7d184 SW |
284 | |
285 | /* Detect ATXP1, checking if vendor ID registers are all zero */ | |
286 | if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) && | |
287 | (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) && | |
288 | (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) && | |
13b3c3fa JD |
289 | (i2c_smbus_read_byte_data(new_client, 0xff) == 0))) |
290 | return -ENODEV; | |
9cb7d184 | 291 | |
13b3c3fa JD |
292 | /* No vendor ID, now checking if registers 0x10,0x11 (non-existent) |
293 | * showing the same as register 0x00 */ | |
294 | temp = i2c_smbus_read_byte_data(new_client, 0x00); | |
9cb7d184 | 295 | |
13b3c3fa JD |
296 | if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) && |
297 | (i2c_smbus_read_byte_data(new_client, 0x11) == temp))) | |
298 | return -ENODEV; | |
9cb7d184 SW |
299 | |
300 | /* Get VRM */ | |
71163c7c | 301 | temp = vid_which_vrm(); |
9cb7d184 | 302 | |
71163c7c JD |
303 | if ((temp != 90) && (temp != 91)) { |
304 | dev_err(&adapter->dev, "atxp1: Not supporting VRM %d.%d\n", | |
305 | temp / 10, temp % 10); | |
306 | return -ENODEV; | |
9cb7d184 SW |
307 | } |
308 | ||
71163c7c | 309 | strlcpy(info->type, "atxp1", I2C_NAME_SIZE); |
9cb7d184 | 310 | |
71163c7c JD |
311 | return 0; |
312 | } | |
9cb7d184 | 313 | |
71163c7c JD |
314 | static int atxp1_probe(struct i2c_client *new_client, |
315 | const struct i2c_device_id *id) | |
316 | { | |
317 | struct atxp1_data *data; | |
318 | int err; | |
9cb7d184 | 319 | |
71163c7c JD |
320 | data = kzalloc(sizeof(struct atxp1_data), GFP_KERNEL); |
321 | if (!data) { | |
322 | err = -ENOMEM; | |
323 | goto exit; | |
9cb7d184 SW |
324 | } |
325 | ||
71163c7c JD |
326 | /* Get VRM */ |
327 | data->vrm = vid_which_vrm(); | |
328 | ||
329 | i2c_set_clientdata(new_client, data); | |
330 | data->valid = 0; | |
331 | ||
332 | mutex_init(&data->update_lock); | |
333 | ||
a5ebe668 JD |
334 | /* Register sysfs hooks */ |
335 | if ((err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group))) | |
71163c7c | 336 | goto exit_free; |
a5ebe668 | 337 | |
1beeffe4 TJ |
338 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
339 | if (IS_ERR(data->hwmon_dev)) { | |
340 | err = PTR_ERR(data->hwmon_dev); | |
a5ebe668 | 341 | goto exit_remove_files; |
943b0830 MH |
342 | } |
343 | ||
9cb7d184 SW |
344 | dev_info(&new_client->dev, "Using VRM: %d.%d\n", |
345 | data->vrm / 10, data->vrm % 10); | |
346 | ||
347 | return 0; | |
348 | ||
a5ebe668 JD |
349 | exit_remove_files: |
350 | sysfs_remove_group(&new_client->dev.kobj, &atxp1_group); | |
9cb7d184 SW |
351 | exit_free: |
352 | kfree(data); | |
353 | exit: | |
354 | return err; | |
355 | }; | |
356 | ||
71163c7c | 357 | static int atxp1_remove(struct i2c_client *client) |
9cb7d184 | 358 | { |
943b0830 | 359 | struct atxp1_data * data = i2c_get_clientdata(client); |
9cb7d184 | 360 | |
1beeffe4 | 361 | hwmon_device_unregister(data->hwmon_dev); |
a5ebe668 | 362 | sysfs_remove_group(&client->dev.kobj, &atxp1_group); |
943b0830 | 363 | |
71163c7c | 364 | kfree(data); |
9cb7d184 | 365 | |
71163c7c | 366 | return 0; |
9cb7d184 SW |
367 | }; |
368 | ||
369 | static int __init atxp1_init(void) | |
370 | { | |
371 | return i2c_add_driver(&atxp1_driver); | |
372 | }; | |
373 | ||
374 | static void __exit atxp1_exit(void) | |
375 | { | |
376 | i2c_del_driver(&atxp1_driver); | |
377 | }; | |
378 | ||
379 | module_init(atxp1_init); | |
380 | module_exit(atxp1_exit); |