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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> |
9cb7d184 SW |
30 | |
31 | MODULE_LICENSE("GPL"); | |
32 | MODULE_DESCRIPTION("System voltages control via Attansic ATXP1"); | |
33 | MODULE_VERSION("0.6.2"); | |
34 | MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>"); | |
35 | ||
36 | #define ATXP1_VID 0x00 | |
37 | #define ATXP1_CVID 0x01 | |
38 | #define ATXP1_GPIO1 0x06 | |
39 | #define ATXP1_GPIO2 0x0a | |
40 | #define ATXP1_VIDENA 0x20 | |
41 | #define ATXP1_VIDMASK 0x1f | |
42 | #define ATXP1_GPIO1MASK 0x0f | |
43 | ||
44 | static unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END }; | |
9cb7d184 | 45 | |
f4b50261 | 46 | I2C_CLIENT_INSMOD_1(atxp1); |
9cb7d184 SW |
47 | |
48 | static int atxp1_attach_adapter(struct i2c_adapter * adapter); | |
49 | static int atxp1_detach_client(struct i2c_client * client); | |
50 | static struct atxp1_data * atxp1_update_device(struct device *dev); | |
51 | static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind); | |
52 | ||
53 | static struct i2c_driver atxp1_driver = { | |
cdaf7934 | 54 | .driver = { |
cdaf7934 LR |
55 | .name = "atxp1", |
56 | }, | |
9cb7d184 SW |
57 | .attach_adapter = atxp1_attach_adapter, |
58 | .detach_client = atxp1_detach_client, | |
59 | }; | |
60 | ||
61 | struct atxp1_data { | |
62 | struct i2c_client client; | |
943b0830 | 63 | struct class_device *class_dev; |
9a61bf63 | 64 | struct mutex update_lock; |
9cb7d184 SW |
65 | unsigned long last_updated; |
66 | u8 valid; | |
67 | struct { | |
68 | u8 vid; /* VID output register */ | |
69 | u8 cpu_vid; /* VID input from CPU */ | |
70 | u8 gpio1; /* General purpose I/O register 1 */ | |
71 | u8 gpio2; /* General purpose I/O register 2 */ | |
72 | } reg; | |
73 | u8 vrm; /* Detected CPU VRM */ | |
74 | }; | |
75 | ||
76 | static struct atxp1_data * atxp1_update_device(struct device *dev) | |
77 | { | |
78 | struct i2c_client *client; | |
79 | struct atxp1_data *data; | |
80 | ||
81 | client = to_i2c_client(dev); | |
82 | data = i2c_get_clientdata(client); | |
83 | ||
9a61bf63 | 84 | mutex_lock(&data->update_lock); |
9cb7d184 | 85 | |
0cacdf29 | 86 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
9cb7d184 SW |
87 | |
88 | /* Update local register data */ | |
89 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
90 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID); | |
91 | data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1); | |
92 | data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2); | |
93 | ||
94 | data->valid = 1; | |
95 | } | |
96 | ||
9a61bf63 | 97 | mutex_unlock(&data->update_lock); |
9cb7d184 SW |
98 | |
99 | return(data); | |
100 | } | |
101 | ||
102 | /* sys file functions for cpu0_vid */ | |
6f637a64 | 103 | static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
104 | { |
105 | int size; | |
106 | struct atxp1_data *data; | |
107 | ||
108 | data = atxp1_update_device(dev); | |
109 | ||
110 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm)); | |
111 | ||
112 | return size; | |
113 | } | |
114 | ||
6f637a64 | 115 | static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
9cb7d184 SW |
116 | { |
117 | struct atxp1_data *data; | |
118 | struct i2c_client *client; | |
119 | char vid; | |
120 | char cvid; | |
121 | unsigned int vcore; | |
122 | ||
123 | client = to_i2c_client(dev); | |
124 | data = atxp1_update_device(dev); | |
125 | ||
126 | vcore = simple_strtoul(buf, NULL, 10); | |
127 | vcore /= 25; | |
128 | vcore *= 25; | |
129 | ||
130 | /* Calculate VID */ | |
131 | vid = vid_to_reg(vcore, data->vrm); | |
132 | ||
133 | if (vid < 0) { | |
134 | dev_err(dev, "VID calculation failed.\n"); | |
135 | return -1; | |
136 | } | |
137 | ||
138 | /* If output enabled, use control register value. Otherwise original CPU VID */ | |
139 | if (data->reg.vid & ATXP1_VIDENA) | |
140 | cvid = data->reg.vid & ATXP1_VIDMASK; | |
141 | else | |
142 | cvid = data->reg.cpu_vid; | |
143 | ||
144 | /* Nothing changed, aborting */ | |
145 | if (vid == cvid) | |
146 | return count; | |
147 | ||
164cad9b | 148 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid); |
9cb7d184 SW |
149 | |
150 | /* Write every 25 mV step to increase stability */ | |
151 | if (cvid > vid) { | |
152 | for (; cvid >= vid; cvid--) { | |
153 | i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA); | |
154 | } | |
155 | } | |
156 | else { | |
157 | for (; cvid <= vid; cvid++) { | |
158 | i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA); | |
159 | } | |
160 | } | |
161 | ||
162 | data->valid = 0; | |
163 | ||
164 | return count; | |
165 | } | |
166 | ||
167 | /* CPU core reference voltage | |
168 | unit: millivolt | |
169 | */ | |
170 | static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore); | |
171 | ||
172 | /* sys file functions for GPIO1 */ | |
6f637a64 | 173 | static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
174 | { |
175 | int size; | |
176 | struct atxp1_data *data; | |
177 | ||
178 | data = atxp1_update_device(dev); | |
179 | ||
180 | size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK); | |
181 | ||
182 | return size; | |
183 | } | |
184 | ||
6f637a64 | 185 | static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, const char*buf, size_t count) |
9cb7d184 SW |
186 | { |
187 | struct atxp1_data *data; | |
188 | struct i2c_client *client; | |
189 | unsigned int value; | |
190 | ||
191 | client = to_i2c_client(dev); | |
192 | data = atxp1_update_device(dev); | |
193 | ||
194 | value = simple_strtoul(buf, NULL, 16); | |
195 | ||
196 | value &= ATXP1_GPIO1MASK; | |
197 | ||
198 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
199 | dev_info(dev, "Writing 0x%x to GPIO1.\n", value); | |
200 | ||
201 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
202 | ||
203 | data->valid = 0; | |
204 | } | |
205 | ||
206 | return count; | |
207 | } | |
208 | ||
209 | /* GPIO1 data register | |
210 | unit: Four bit as hex (e.g. 0x0f) | |
211 | */ | |
212 | static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1); | |
213 | ||
214 | /* sys file functions for GPIO2 */ | |
6f637a64 | 215 | static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
216 | { |
217 | int size; | |
218 | struct atxp1_data *data; | |
219 | ||
220 | data = atxp1_update_device(dev); | |
221 | ||
222 | size = sprintf(buf, "0x%02x\n", data->reg.gpio2); | |
223 | ||
224 | return size; | |
225 | } | |
226 | ||
6f637a64 | 227 | static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
9cb7d184 SW |
228 | { |
229 | struct atxp1_data *data; | |
230 | struct i2c_client *client; | |
231 | unsigned int value; | |
232 | ||
233 | client = to_i2c_client(dev); | |
234 | data = atxp1_update_device(dev); | |
235 | ||
236 | value = simple_strtoul(buf, NULL, 16) & 0xff; | |
237 | ||
238 | if (value != data->reg.gpio2) { | |
239 | dev_info(dev, "Writing 0x%x to GPIO1.\n", value); | |
240 | ||
241 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
242 | ||
243 | data->valid = 0; | |
244 | } | |
245 | ||
246 | return count; | |
247 | } | |
248 | ||
249 | /* GPIO2 data register | |
250 | unit: Eight bit as hex (e.g. 0xff) | |
251 | */ | |
252 | static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2); | |
253 | ||
254 | ||
255 | static int atxp1_attach_adapter(struct i2c_adapter *adapter) | |
256 | { | |
ddec748f JD |
257 | if (!(adapter->class & I2C_CLASS_HWMON)) |
258 | return 0; | |
2ed2dc3c | 259 | return i2c_probe(adapter, &addr_data, &atxp1_detect); |
9cb7d184 SW |
260 | }; |
261 | ||
262 | static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind) | |
263 | { | |
264 | struct i2c_client * new_client; | |
265 | struct atxp1_data * data; | |
266 | int err = 0; | |
267 | u8 temp; | |
268 | ||
269 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
270 | goto exit; | |
271 | ||
ba9c2e8d | 272 | if (!(data = kzalloc(sizeof(struct atxp1_data), GFP_KERNEL))) { |
9cb7d184 SW |
273 | err = -ENOMEM; |
274 | goto exit; | |
275 | } | |
276 | ||
9cb7d184 SW |
277 | new_client = &data->client; |
278 | i2c_set_clientdata(new_client, data); | |
279 | ||
280 | new_client->addr = address; | |
281 | new_client->adapter = adapter; | |
282 | new_client->driver = &atxp1_driver; | |
283 | new_client->flags = 0; | |
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) && | |
289 | (i2c_smbus_read_byte_data(new_client, 0xff) == 0) )) { | |
290 | ||
291 | /* No vendor ID, now checking if registers 0x10,0x11 (non-existent) | |
292 | * showing the same as register 0x00 */ | |
293 | temp = i2c_smbus_read_byte_data(new_client, 0x00); | |
294 | ||
295 | if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) && | |
296 | (i2c_smbus_read_byte_data(new_client, 0x11) == temp) )) | |
297 | goto exit_free; | |
298 | } | |
299 | ||
300 | /* Get VRM */ | |
303760b4 | 301 | data->vrm = vid_which_vrm(); |
9cb7d184 SW |
302 | |
303 | if ((data->vrm != 90) && (data->vrm != 91)) { | |
304 | dev_err(&new_client->dev, "Not supporting VRM %d.%d\n", | |
305 | data->vrm / 10, data->vrm % 10); | |
306 | goto exit_free; | |
307 | } | |
308 | ||
309 | strncpy(new_client->name, "atxp1", I2C_NAME_SIZE); | |
310 | ||
311 | data->valid = 0; | |
312 | ||
9a61bf63 | 313 | mutex_init(&data->update_lock); |
9cb7d184 SW |
314 | |
315 | err = i2c_attach_client(new_client); | |
316 | ||
317 | if (err) | |
318 | { | |
319 | dev_err(&new_client->dev, "Attach client error.\n"); | |
320 | goto exit_free; | |
321 | } | |
322 | ||
943b0830 MH |
323 | data->class_dev = hwmon_device_register(&new_client->dev); |
324 | if (IS_ERR(data->class_dev)) { | |
325 | err = PTR_ERR(data->class_dev); | |
326 | goto exit_detach; | |
327 | } | |
328 | ||
9cb7d184 SW |
329 | device_create_file(&new_client->dev, &dev_attr_gpio1); |
330 | device_create_file(&new_client->dev, &dev_attr_gpio2); | |
331 | device_create_file(&new_client->dev, &dev_attr_cpu0_vid); | |
332 | ||
333 | dev_info(&new_client->dev, "Using VRM: %d.%d\n", | |
334 | data->vrm / 10, data->vrm % 10); | |
335 | ||
336 | return 0; | |
337 | ||
943b0830 MH |
338 | exit_detach: |
339 | i2c_detach_client(new_client); | |
9cb7d184 SW |
340 | exit_free: |
341 | kfree(data); | |
342 | exit: | |
343 | return err; | |
344 | }; | |
345 | ||
346 | static int atxp1_detach_client(struct i2c_client * client) | |
347 | { | |
943b0830 | 348 | struct atxp1_data * data = i2c_get_clientdata(client); |
9cb7d184 SW |
349 | int err; |
350 | ||
943b0830 MH |
351 | hwmon_device_unregister(data->class_dev); |
352 | ||
9cb7d184 SW |
353 | err = i2c_detach_client(client); |
354 | ||
355 | if (err) | |
356 | dev_err(&client->dev, "Failed to detach client.\n"); | |
357 | else | |
943b0830 | 358 | kfree(data); |
9cb7d184 SW |
359 | |
360 | return err; | |
361 | }; | |
362 | ||
363 | static int __init atxp1_init(void) | |
364 | { | |
365 | return i2c_add_driver(&atxp1_driver); | |
366 | }; | |
367 | ||
368 | static void __exit atxp1_exit(void) | |
369 | { | |
370 | i2c_del_driver(&atxp1_driver); | |
371 | }; | |
372 | ||
373 | module_init(atxp1_init); | |
374 | module_exit(atxp1_exit); |