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Commit | Line | Data |
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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 | |
9cb7d184 | 48 | struct atxp1_data { |
1beeffe4 | 49 | struct device *hwmon_dev; |
9a61bf63 | 50 | struct mutex update_lock; |
9cb7d184 SW |
51 | unsigned long last_updated; |
52 | u8 valid; | |
53 | struct { | |
54 | u8 vid; /* VID output register */ | |
55 | u8 cpu_vid; /* VID input from CPU */ | |
56 | u8 gpio1; /* General purpose I/O register 1 */ | |
57 | u8 gpio2; /* General purpose I/O register 2 */ | |
58 | } reg; | |
59 | u8 vrm; /* Detected CPU VRM */ | |
60 | }; | |
61 | ||
f24d548b | 62 | static struct atxp1_data *atxp1_update_device(struct device *dev) |
9cb7d184 SW |
63 | { |
64 | struct i2c_client *client; | |
65 | struct atxp1_data *data; | |
66 | ||
67 | client = to_i2c_client(dev); | |
68 | data = i2c_get_clientdata(client); | |
69 | ||
9a61bf63 | 70 | mutex_lock(&data->update_lock); |
9cb7d184 | 71 | |
0cacdf29 | 72 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
9cb7d184 SW |
73 | |
74 | /* Update local register data */ | |
75 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
f24d548b GR |
76 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, |
77 | ATXP1_CVID); | |
9cb7d184 SW |
78 | data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1); |
79 | data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2); | |
80 | ||
81 | data->valid = 1; | |
82 | } | |
83 | ||
9a61bf63 | 84 | mutex_unlock(&data->update_lock); |
9cb7d184 | 85 | |
7fe83ad8 | 86 | return data; |
9cb7d184 SW |
87 | } |
88 | ||
89 | /* sys file functions for cpu0_vid */ | |
f24d548b GR |
90 | static ssize_t atxp1_showvcore(struct device *dev, |
91 | struct device_attribute *attr, char *buf) | |
9cb7d184 SW |
92 | { |
93 | int size; | |
94 | struct atxp1_data *data; | |
95 | ||
96 | data = atxp1_update_device(dev); | |
97 | ||
f24d548b GR |
98 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, |
99 | data->vrm)); | |
9cb7d184 SW |
100 | |
101 | return size; | |
102 | } | |
103 | ||
f24d548b GR |
104 | static ssize_t atxp1_storevcore(struct device *dev, |
105 | struct device_attribute *attr, | |
106 | const char *buf, size_t count) | |
9cb7d184 SW |
107 | { |
108 | struct atxp1_data *data; | |
109 | struct i2c_client *client; | |
c41bdb52 | 110 | int vid, cvid; |
f24d548b GR |
111 | unsigned long vcore; |
112 | int err; | |
9cb7d184 SW |
113 | |
114 | client = to_i2c_client(dev); | |
115 | data = atxp1_update_device(dev); | |
116 | ||
f24d548b GR |
117 | err = kstrtoul(buf, 10, &vcore); |
118 | if (err) | |
119 | return err; | |
120 | ||
9cb7d184 SW |
121 | vcore /= 25; |
122 | vcore *= 25; | |
123 | ||
124 | /* Calculate VID */ | |
125 | vid = vid_to_reg(vcore, data->vrm); | |
9cb7d184 SW |
126 | if (vid < 0) { |
127 | dev_err(dev, "VID calculation failed.\n"); | |
674d0ed8 | 128 | return vid; |
9cb7d184 SW |
129 | } |
130 | ||
f24d548b GR |
131 | /* |
132 | * If output enabled, use control register value. | |
133 | * Otherwise original CPU VID | |
134 | */ | |
9cb7d184 SW |
135 | if (data->reg.vid & ATXP1_VIDENA) |
136 | cvid = data->reg.vid & ATXP1_VIDMASK; | |
137 | else | |
138 | cvid = data->reg.cpu_vid; | |
139 | ||
140 | /* Nothing changed, aborting */ | |
141 | if (vid == cvid) | |
142 | return count; | |
143 | ||
f24d548b | 144 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", (int)vcore, vid); |
9cb7d184 SW |
145 | |
146 | /* Write every 25 mV step to increase stability */ | |
147 | if (cvid > vid) { | |
f24d548b GR |
148 | for (; cvid >= vid; cvid--) |
149 | i2c_smbus_write_byte_data(client, | |
150 | ATXP1_VID, cvid | ATXP1_VIDENA); | |
151 | } else { | |
152 | for (; cvid <= vid; cvid++) | |
153 | i2c_smbus_write_byte_data(client, | |
154 | ATXP1_VID, cvid | ATXP1_VIDENA); | |
9cb7d184 SW |
155 | } |
156 | ||
157 | data->valid = 0; | |
158 | ||
159 | return count; | |
160 | } | |
161 | ||
f24d548b GR |
162 | /* |
163 | * CPU core reference voltage | |
164 | * unit: millivolt | |
165 | */ | |
166 | static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, | |
167 | atxp1_storevcore); | |
9cb7d184 SW |
168 | |
169 | /* sys file functions for GPIO1 */ | |
f24d548b GR |
170 | static ssize_t atxp1_showgpio1(struct device *dev, |
171 | struct device_attribute *attr, char *buf) | |
9cb7d184 SW |
172 | { |
173 | int size; | |
174 | struct atxp1_data *data; | |
175 | ||
176 | data = atxp1_update_device(dev); | |
177 | ||
178 | size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK); | |
179 | ||
180 | return size; | |
181 | } | |
182 | ||
f24d548b GR |
183 | static ssize_t atxp1_storegpio1(struct device *dev, |
184 | struct device_attribute *attr, const char *buf, | |
185 | size_t count) | |
9cb7d184 SW |
186 | { |
187 | struct atxp1_data *data; | |
188 | struct i2c_client *client; | |
f24d548b GR |
189 | unsigned long value; |
190 | int err; | |
9cb7d184 SW |
191 | |
192 | client = to_i2c_client(dev); | |
193 | data = atxp1_update_device(dev); | |
194 | ||
f24d548b GR |
195 | err = kstrtoul(buf, 16, &value); |
196 | if (err) | |
197 | return err; | |
9cb7d184 SW |
198 | |
199 | value &= ATXP1_GPIO1MASK; | |
200 | ||
201 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
f24d548b | 202 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); |
9cb7d184 SW |
203 | |
204 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
205 | ||
206 | data->valid = 0; | |
207 | } | |
208 | ||
209 | return count; | |
210 | } | |
211 | ||
f24d548b GR |
212 | /* |
213 | * GPIO1 data register | |
214 | * unit: Four bit as hex (e.g. 0x0f) | |
215 | */ | |
9cb7d184 SW |
216 | static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1); |
217 | ||
218 | /* sys file functions for GPIO2 */ | |
f24d548b GR |
219 | static ssize_t atxp1_showgpio2(struct device *dev, |
220 | struct device_attribute *attr, char *buf) | |
9cb7d184 SW |
221 | { |
222 | int size; | |
223 | struct atxp1_data *data; | |
224 | ||
225 | data = atxp1_update_device(dev); | |
226 | ||
227 | size = sprintf(buf, "0x%02x\n", data->reg.gpio2); | |
228 | ||
229 | return size; | |
230 | } | |
231 | ||
f24d548b GR |
232 | static ssize_t atxp1_storegpio2(struct device *dev, |
233 | struct device_attribute *attr, | |
234 | const char *buf, size_t count) | |
9cb7d184 | 235 | { |
f24d548b GR |
236 | struct atxp1_data *data = atxp1_update_device(dev); |
237 | struct i2c_client *client = to_i2c_client(dev); | |
238 | unsigned long value; | |
239 | int err; | |
9cb7d184 | 240 | |
f24d548b GR |
241 | err = kstrtoul(buf, 16, &value); |
242 | if (err) | |
243 | return err; | |
244 | value &= 0xff; | |
9cb7d184 SW |
245 | |
246 | if (value != data->reg.gpio2) { | |
f24d548b | 247 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); |
9cb7d184 SW |
248 | |
249 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
250 | ||
251 | data->valid = 0; | |
252 | } | |
253 | ||
254 | return count; | |
255 | } | |
256 | ||
f24d548b GR |
257 | /* |
258 | * GPIO2 data register | |
259 | * unit: Eight bit as hex (e.g. 0xff) | |
260 | */ | |
9cb7d184 SW |
261 | static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2); |
262 | ||
a5ebe668 JD |
263 | static struct attribute *atxp1_attributes[] = { |
264 | &dev_attr_gpio1.attr, | |
265 | &dev_attr_gpio2.attr, | |
266 | &dev_attr_cpu0_vid.attr, | |
267 | NULL | |
268 | }; | |
269 | ||
270 | static const struct attribute_group atxp1_group = { | |
271 | .attrs = atxp1_attributes, | |
272 | }; | |
273 | ||
9cb7d184 | 274 | |
71163c7c | 275 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 276 | static int atxp1_detect(struct i2c_client *new_client, |
71163c7c | 277 | struct i2c_board_info *info) |
9cb7d184 | 278 | { |
71163c7c | 279 | struct i2c_adapter *adapter = new_client->adapter; |
9cb7d184 | 280 | |
9cb7d184 SW |
281 | u8 temp; |
282 | ||
283 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
71163c7c | 284 | return -ENODEV; |
9cb7d184 SW |
285 | |
286 | /* Detect ATXP1, checking if vendor ID registers are all zero */ | |
287 | if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) && | |
288 | (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) && | |
289 | (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) && | |
13b3c3fa JD |
290 | (i2c_smbus_read_byte_data(new_client, 0xff) == 0))) |
291 | return -ENODEV; | |
9cb7d184 | 292 | |
f24d548b GR |
293 | /* |
294 | * No vendor ID, now checking if registers 0x10,0x11 (non-existent) | |
295 | * showing the same as register 0x00 | |
296 | */ | |
13b3c3fa | 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 | |
d466a353 GR |
323 | data = devm_kzalloc(&new_client->dev, sizeof(struct atxp1_data), |
324 | GFP_KERNEL); | |
325 | if (!data) | |
326 | return -ENOMEM; | |
9cb7d184 | 327 | |
71163c7c JD |
328 | /* Get VRM */ |
329 | data->vrm = vid_which_vrm(); | |
330 | ||
331 | i2c_set_clientdata(new_client, data); | |
71163c7c JD |
332 | mutex_init(&data->update_lock); |
333 | ||
a5ebe668 | 334 | /* Register sysfs hooks */ |
f24d548b GR |
335 | err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group); |
336 | if (err) | |
d466a353 | 337 | return err; |
a5ebe668 | 338 | |
1beeffe4 TJ |
339 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
340 | if (IS_ERR(data->hwmon_dev)) { | |
341 | err = PTR_ERR(data->hwmon_dev); | |
a5ebe668 | 342 | goto exit_remove_files; |
943b0830 MH |
343 | } |
344 | ||
9cb7d184 SW |
345 | dev_info(&new_client->dev, "Using VRM: %d.%d\n", |
346 | data->vrm / 10, data->vrm % 10); | |
347 | ||
348 | return 0; | |
349 | ||
a5ebe668 JD |
350 | exit_remove_files: |
351 | sysfs_remove_group(&new_client->dev.kobj, &atxp1_group); | |
9cb7d184 SW |
352 | return err; |
353 | }; | |
354 | ||
71163c7c | 355 | static int atxp1_remove(struct i2c_client *client) |
9cb7d184 | 356 | { |
f24d548b | 357 | struct atxp1_data *data = i2c_get_clientdata(client); |
9cb7d184 | 358 | |
1beeffe4 | 359 | hwmon_device_unregister(data->hwmon_dev); |
a5ebe668 | 360 | sysfs_remove_group(&client->dev.kobj, &atxp1_group); |
943b0830 | 361 | |
71163c7c | 362 | return 0; |
9cb7d184 SW |
363 | }; |
364 | ||
8dea1b4e AL |
365 | static const struct i2c_device_id atxp1_id[] = { |
366 | { "atxp1", 0 }, | |
367 | { } | |
368 | }; | |
369 | MODULE_DEVICE_TABLE(i2c, atxp1_id); | |
370 | ||
371 | static struct i2c_driver atxp1_driver = { | |
372 | .class = I2C_CLASS_HWMON, | |
373 | .driver = { | |
374 | .name = "atxp1", | |
375 | }, | |
376 | .probe = atxp1_probe, | |
377 | .remove = atxp1_remove, | |
378 | .id_table = atxp1_id, | |
379 | .detect = atxp1_detect, | |
380 | .address_list = normal_i2c, | |
381 | }; | |
382 | ||
f0967eea | 383 | module_i2c_driver(atxp1_driver); |