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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> | |
24 | #include <linux/jiffies.h> | |
25 | #include <linux/i2c.h> | |
26 | #include <linux/hwmon.h> | |
27 | #include <linux/hwmon-vid.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/mutex.h> | |
30 | #include <linux/sysfs.h> | |
31 | #include <linux/slab.h> | |
32 | ||
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_DESCRIPTION("System voltages control via Attansic ATXP1"); | |
35 | MODULE_VERSION("0.6.3"); | |
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 | ||
46 | static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END }; | |
47 | ||
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); | |
51 | static struct atxp1_data * atxp1_update_device(struct device *dev); | |
52 | static int atxp1_detect(struct i2c_client *client, struct i2c_board_info *info); | |
53 | ||
54 | static const struct i2c_device_id atxp1_id[] = { | |
55 | { "atxp1", 0 }, | |
56 | { } | |
57 | }; | |
58 | MODULE_DEVICE_TABLE(i2c, atxp1_id); | |
59 | ||
60 | static struct i2c_driver atxp1_driver = { | |
61 | .class = I2C_CLASS_HWMON, | |
62 | .driver = { | |
63 | .name = "atxp1", | |
64 | }, | |
65 | .probe = atxp1_probe, | |
66 | .remove = atxp1_remove, | |
67 | .id_table = atxp1_id, | |
68 | .detect = atxp1_detect, | |
69 | .address_list = normal_i2c, | |
70 | }; | |
71 | ||
72 | struct atxp1_data { | |
73 | struct device *hwmon_dev; | |
74 | struct mutex update_lock; | |
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 | ||
86 | static struct atxp1_data * atxp1_update_device(struct device *dev) | |
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 | ||
94 | mutex_lock(&data->update_lock); | |
95 | ||
96 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
97 | ||
98 | /* Update local register data */ | |
99 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
100 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID); | |
101 | data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1); | |
102 | data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2); | |
103 | ||
104 | data->valid = 1; | |
105 | } | |
106 | ||
107 | mutex_unlock(&data->update_lock); | |
108 | ||
109 | return data; | |
110 | } | |
111 | ||
112 | /* sys file functions for cpu0_vid */ | |
113 | static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, char *buf) | |
114 | { | |
115 | int size; | |
116 | struct atxp1_data *data; | |
117 | ||
118 | data = atxp1_update_device(dev); | |
119 | ||
120 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm)); | |
121 | ||
122 | return size; | |
123 | } | |
124 | ||
125 | static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
126 | { | |
127 | struct atxp1_data *data; | |
128 | struct i2c_client *client; | |
129 | int vid, cvid; | |
130 | unsigned int vcore; | |
131 | ||
132 | client = to_i2c_client(dev); | |
133 | data = atxp1_update_device(dev); | |
134 | ||
135 | vcore = simple_strtoul(buf, NULL, 10); | |
136 | vcore /= 25; | |
137 | vcore *= 25; | |
138 | ||
139 | /* Calculate VID */ | |
140 | vid = vid_to_reg(vcore, data->vrm); | |
141 | ||
142 | if (vid < 0) { | |
143 | dev_err(dev, "VID calculation failed.\n"); | |
144 | return -1; | |
145 | } | |
146 | ||
147 | /* If output enabled, use control register value. Otherwise original CPU VID */ | |
148 | if (data->reg.vid & ATXP1_VIDENA) | |
149 | cvid = data->reg.vid & ATXP1_VIDMASK; | |
150 | else | |
151 | cvid = data->reg.cpu_vid; | |
152 | ||
153 | /* Nothing changed, aborting */ | |
154 | if (vid == cvid) | |
155 | return count; | |
156 | ||
157 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid); | |
158 | ||
159 | /* Write every 25 mV step to increase stability */ | |
160 | if (cvid > vid) { | |
161 | for (; cvid >= vid; cvid--) { | |
162 | i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA); | |
163 | } | |
164 | } | |
165 | else { | |
166 | for (; cvid <= vid; cvid++) { | |
167 | i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA); | |
168 | } | |
169 | } | |
170 | ||
171 | data->valid = 0; | |
172 | ||
173 | return count; | |
174 | } | |
175 | ||
176 | /* CPU core reference voltage | |
177 | unit: millivolt | |
178 | */ | |
179 | static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore); | |
180 | ||
181 | /* sys file functions for GPIO1 */ | |
182 | static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, char *buf) | |
183 | { | |
184 | int size; | |
185 | struct atxp1_data *data; | |
186 | ||
187 | data = atxp1_update_device(dev); | |
188 | ||
189 | size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK); | |
190 | ||
191 | return size; | |
192 | } | |
193 | ||
194 | static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, const char*buf, size_t count) | |
195 | { | |
196 | struct atxp1_data *data; | |
197 | struct i2c_client *client; | |
198 | unsigned int value; | |
199 | ||
200 | client = to_i2c_client(dev); | |
201 | data = atxp1_update_device(dev); | |
202 | ||
203 | value = simple_strtoul(buf, NULL, 16); | |
204 | ||
205 | value &= ATXP1_GPIO1MASK; | |
206 | ||
207 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
208 | dev_info(dev, "Writing 0x%x to GPIO1.\n", value); | |
209 | ||
210 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
211 | ||
212 | data->valid = 0; | |
213 | } | |
214 | ||
215 | return count; | |
216 | } | |
217 | ||
218 | /* GPIO1 data register | |
219 | unit: Four bit as hex (e.g. 0x0f) | |
220 | */ | |
221 | static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1); | |
222 | ||
223 | /* sys file functions for GPIO2 */ | |
224 | static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf) | |
225 | { | |
226 | int size; | |
227 | struct atxp1_data *data; | |
228 | ||
229 | data = atxp1_update_device(dev); | |
230 | ||
231 | size = sprintf(buf, "0x%02x\n", data->reg.gpio2); | |
232 | ||
233 | return size; | |
234 | } | |
235 | ||
236 | static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | |
237 | { | |
238 | struct atxp1_data *data; | |
239 | struct i2c_client *client; | |
240 | unsigned int value; | |
241 | ||
242 | client = to_i2c_client(dev); | |
243 | data = atxp1_update_device(dev); | |
244 | ||
245 | value = simple_strtoul(buf, NULL, 16) & 0xff; | |
246 | ||
247 | if (value != data->reg.gpio2) { | |
248 | dev_info(dev, "Writing 0x%x to GPIO1.\n", value); | |
249 | ||
250 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
251 | ||
252 | data->valid = 0; | |
253 | } | |
254 | ||
255 | return count; | |
256 | } | |
257 | ||
258 | /* GPIO2 data register | |
259 | unit: Eight bit as hex (e.g. 0xff) | |
260 | */ | |
261 | static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2); | |
262 | ||
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 | ||
274 | ||
275 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
276 | static int atxp1_detect(struct i2c_client *new_client, | |
277 | struct i2c_board_info *info) | |
278 | { | |
279 | struct i2c_adapter *adapter = new_client->adapter; | |
280 | ||
281 | u8 temp; | |
282 | ||
283 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
284 | return -ENODEV; | |
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) && | |
290 | (i2c_smbus_read_byte_data(new_client, 0xff) == 0))) | |
291 | return -ENODEV; | |
292 | ||
293 | /* No vendor ID, now checking if registers 0x10,0x11 (non-existent) | |
294 | * showing the same as register 0x00 */ | |
295 | temp = i2c_smbus_read_byte_data(new_client, 0x00); | |
296 | ||
297 | if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) && | |
298 | (i2c_smbus_read_byte_data(new_client, 0x11) == temp))) | |
299 | return -ENODEV; | |
300 | ||
301 | /* Get VRM */ | |
302 | temp = vid_which_vrm(); | |
303 | ||
304 | if ((temp != 90) && (temp != 91)) { | |
305 | dev_err(&adapter->dev, "atxp1: Not supporting VRM %d.%d\n", | |
306 | temp / 10, temp % 10); | |
307 | return -ENODEV; | |
308 | } | |
309 | ||
310 | strlcpy(info->type, "atxp1", I2C_NAME_SIZE); | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | static int atxp1_probe(struct i2c_client *new_client, | |
316 | const struct i2c_device_id *id) | |
317 | { | |
318 | struct atxp1_data *data; | |
319 | int err; | |
320 | ||
321 | data = kzalloc(sizeof(struct atxp1_data), GFP_KERNEL); | |
322 | if (!data) { | |
323 | err = -ENOMEM; | |
324 | goto exit; | |
325 | } | |
326 | ||
327 | /* Get VRM */ | |
328 | data->vrm = vid_which_vrm(); | |
329 | ||
330 | i2c_set_clientdata(new_client, data); | |
331 | data->valid = 0; | |
332 | ||
333 | mutex_init(&data->update_lock); | |
334 | ||
335 | /* Register sysfs hooks */ | |
336 | if ((err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group))) | |
337 | goto exit_free; | |
338 | ||
339 | data->hwmon_dev = hwmon_device_register(&new_client->dev); | |
340 | if (IS_ERR(data->hwmon_dev)) { | |
341 | err = PTR_ERR(data->hwmon_dev); | |
342 | goto exit_remove_files; | |
343 | } | |
344 | ||
345 | dev_info(&new_client->dev, "Using VRM: %d.%d\n", | |
346 | data->vrm / 10, data->vrm % 10); | |
347 | ||
348 | return 0; | |
349 | ||
350 | exit_remove_files: | |
351 | sysfs_remove_group(&new_client->dev.kobj, &atxp1_group); | |
352 | exit_free: | |
353 | kfree(data); | |
354 | exit: | |
355 | return err; | |
356 | }; | |
357 | ||
358 | static int atxp1_remove(struct i2c_client *client) | |
359 | { | |
360 | struct atxp1_data * data = i2c_get_clientdata(client); | |
361 | ||
362 | hwmon_device_unregister(data->hwmon_dev); | |
363 | sysfs_remove_group(&client->dev.kobj, &atxp1_group); | |
364 | ||
365 | kfree(data); | |
366 | ||
367 | return 0; | |
368 | }; | |
369 | ||
370 | module_i2c_driver(atxp1_driver); |