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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 { |
11f7e494 | 49 | struct i2c_client *client; |
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 | 63 | { |
11f7e494 AL |
64 | struct atxp1_data *data = dev_get_drvdata(dev); |
65 | struct i2c_client *client = data->client; | |
9cb7d184 | 66 | |
9a61bf63 | 67 | mutex_lock(&data->update_lock); |
9cb7d184 | 68 | |
0cacdf29 | 69 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
9cb7d184 SW |
70 | |
71 | /* Update local register data */ | |
72 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
f24d548b GR |
73 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, |
74 | ATXP1_CVID); | |
9cb7d184 SW |
75 | data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1); |
76 | data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2); | |
77 | ||
78 | data->valid = 1; | |
79 | } | |
80 | ||
9a61bf63 | 81 | mutex_unlock(&data->update_lock); |
9cb7d184 | 82 | |
7fe83ad8 | 83 | return data; |
9cb7d184 SW |
84 | } |
85 | ||
86 | /* sys file functions for cpu0_vid */ | |
f24d548b GR |
87 | static ssize_t atxp1_showvcore(struct device *dev, |
88 | struct device_attribute *attr, char *buf) | |
9cb7d184 SW |
89 | { |
90 | int size; | |
91 | struct atxp1_data *data; | |
92 | ||
93 | data = atxp1_update_device(dev); | |
94 | ||
f24d548b GR |
95 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, |
96 | data->vrm)); | |
9cb7d184 SW |
97 | |
98 | return size; | |
99 | } | |
100 | ||
f24d548b GR |
101 | static ssize_t atxp1_storevcore(struct device *dev, |
102 | struct device_attribute *attr, | |
103 | const char *buf, size_t count) | |
9cb7d184 | 104 | { |
11f7e494 AL |
105 | struct atxp1_data *data = atxp1_update_device(dev); |
106 | struct i2c_client *client = data->client; | |
c41bdb52 | 107 | int vid, cvid; |
f24d548b GR |
108 | unsigned long vcore; |
109 | int err; | |
9cb7d184 | 110 | |
f24d548b GR |
111 | err = kstrtoul(buf, 10, &vcore); |
112 | if (err) | |
113 | return err; | |
114 | ||
9cb7d184 SW |
115 | vcore /= 25; |
116 | vcore *= 25; | |
117 | ||
118 | /* Calculate VID */ | |
119 | vid = vid_to_reg(vcore, data->vrm); | |
9cb7d184 SW |
120 | if (vid < 0) { |
121 | dev_err(dev, "VID calculation failed.\n"); | |
674d0ed8 | 122 | return vid; |
9cb7d184 SW |
123 | } |
124 | ||
f24d548b GR |
125 | /* |
126 | * If output enabled, use control register value. | |
127 | * Otherwise original CPU VID | |
128 | */ | |
9cb7d184 SW |
129 | if (data->reg.vid & ATXP1_VIDENA) |
130 | cvid = data->reg.vid & ATXP1_VIDMASK; | |
131 | else | |
132 | cvid = data->reg.cpu_vid; | |
133 | ||
134 | /* Nothing changed, aborting */ | |
135 | if (vid == cvid) | |
136 | return count; | |
137 | ||
f24d548b | 138 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", (int)vcore, vid); |
9cb7d184 SW |
139 | |
140 | /* Write every 25 mV step to increase stability */ | |
141 | if (cvid > vid) { | |
f24d548b GR |
142 | for (; cvid >= vid; cvid--) |
143 | i2c_smbus_write_byte_data(client, | |
144 | ATXP1_VID, cvid | ATXP1_VIDENA); | |
145 | } else { | |
146 | for (; cvid <= vid; cvid++) | |
147 | i2c_smbus_write_byte_data(client, | |
148 | ATXP1_VID, cvid | ATXP1_VIDENA); | |
9cb7d184 SW |
149 | } |
150 | ||
151 | data->valid = 0; | |
152 | ||
153 | return count; | |
154 | } | |
155 | ||
f24d548b GR |
156 | /* |
157 | * CPU core reference voltage | |
158 | * unit: millivolt | |
159 | */ | |
160 | static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, | |
161 | atxp1_storevcore); | |
9cb7d184 SW |
162 | |
163 | /* sys file functions for GPIO1 */ | |
f24d548b GR |
164 | static ssize_t atxp1_showgpio1(struct device *dev, |
165 | struct device_attribute *attr, char *buf) | |
9cb7d184 SW |
166 | { |
167 | int size; | |
168 | struct atxp1_data *data; | |
169 | ||
170 | data = atxp1_update_device(dev); | |
171 | ||
172 | size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK); | |
173 | ||
174 | return size; | |
175 | } | |
176 | ||
f24d548b GR |
177 | static ssize_t atxp1_storegpio1(struct device *dev, |
178 | struct device_attribute *attr, const char *buf, | |
179 | size_t count) | |
9cb7d184 | 180 | { |
11f7e494 AL |
181 | struct atxp1_data *data = atxp1_update_device(dev); |
182 | struct i2c_client *client = data->client; | |
f24d548b GR |
183 | unsigned long value; |
184 | int err; | |
9cb7d184 | 185 | |
f24d548b GR |
186 | err = kstrtoul(buf, 16, &value); |
187 | if (err) | |
188 | return err; | |
9cb7d184 SW |
189 | |
190 | value &= ATXP1_GPIO1MASK; | |
191 | ||
192 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
f24d548b | 193 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); |
9cb7d184 SW |
194 | |
195 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
196 | ||
197 | data->valid = 0; | |
198 | } | |
199 | ||
200 | return count; | |
201 | } | |
202 | ||
f24d548b GR |
203 | /* |
204 | * GPIO1 data register | |
205 | * unit: Four bit as hex (e.g. 0x0f) | |
206 | */ | |
9cb7d184 SW |
207 | static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1); |
208 | ||
209 | /* sys file functions for GPIO2 */ | |
f24d548b GR |
210 | static ssize_t atxp1_showgpio2(struct device *dev, |
211 | struct device_attribute *attr, char *buf) | |
9cb7d184 SW |
212 | { |
213 | int size; | |
214 | struct atxp1_data *data; | |
215 | ||
216 | data = atxp1_update_device(dev); | |
217 | ||
218 | size = sprintf(buf, "0x%02x\n", data->reg.gpio2); | |
219 | ||
220 | return size; | |
221 | } | |
222 | ||
f24d548b GR |
223 | static ssize_t atxp1_storegpio2(struct device *dev, |
224 | struct device_attribute *attr, | |
225 | const char *buf, size_t count) | |
9cb7d184 | 226 | { |
f24d548b | 227 | struct atxp1_data *data = atxp1_update_device(dev); |
11f7e494 | 228 | struct i2c_client *client = data->client; |
f24d548b GR |
229 | unsigned long value; |
230 | int err; | |
9cb7d184 | 231 | |
f24d548b GR |
232 | err = kstrtoul(buf, 16, &value); |
233 | if (err) | |
234 | return err; | |
235 | value &= 0xff; | |
9cb7d184 SW |
236 | |
237 | if (value != data->reg.gpio2) { | |
f24d548b | 238 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); |
9cb7d184 SW |
239 | |
240 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
241 | ||
242 | data->valid = 0; | |
243 | } | |
244 | ||
245 | return count; | |
246 | } | |
247 | ||
f24d548b GR |
248 | /* |
249 | * GPIO2 data register | |
250 | * unit: Eight bit as hex (e.g. 0xff) | |
251 | */ | |
9cb7d184 SW |
252 | static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2); |
253 | ||
11f7e494 | 254 | static struct attribute *atxp1_attrs[] = { |
a5ebe668 JD |
255 | &dev_attr_gpio1.attr, |
256 | &dev_attr_gpio2.attr, | |
257 | &dev_attr_cpu0_vid.attr, | |
258 | NULL | |
259 | }; | |
11f7e494 | 260 | ATTRIBUTE_GROUPS(atxp1); |
9cb7d184 | 261 | |
71163c7c | 262 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 263 | static int atxp1_detect(struct i2c_client *new_client, |
71163c7c | 264 | struct i2c_board_info *info) |
9cb7d184 | 265 | { |
71163c7c | 266 | struct i2c_adapter *adapter = new_client->adapter; |
9cb7d184 | 267 | |
9cb7d184 SW |
268 | u8 temp; |
269 | ||
270 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
71163c7c | 271 | return -ENODEV; |
9cb7d184 SW |
272 | |
273 | /* Detect ATXP1, checking if vendor ID registers are all zero */ | |
274 | if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) && | |
275 | (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) && | |
276 | (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) && | |
13b3c3fa JD |
277 | (i2c_smbus_read_byte_data(new_client, 0xff) == 0))) |
278 | return -ENODEV; | |
9cb7d184 | 279 | |
f24d548b GR |
280 | /* |
281 | * No vendor ID, now checking if registers 0x10,0x11 (non-existent) | |
282 | * showing the same as register 0x00 | |
283 | */ | |
13b3c3fa | 284 | temp = i2c_smbus_read_byte_data(new_client, 0x00); |
9cb7d184 | 285 | |
13b3c3fa JD |
286 | if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) && |
287 | (i2c_smbus_read_byte_data(new_client, 0x11) == temp))) | |
288 | return -ENODEV; | |
9cb7d184 SW |
289 | |
290 | /* Get VRM */ | |
71163c7c | 291 | temp = vid_which_vrm(); |
9cb7d184 | 292 | |
71163c7c JD |
293 | if ((temp != 90) && (temp != 91)) { |
294 | dev_err(&adapter->dev, "atxp1: Not supporting VRM %d.%d\n", | |
295 | temp / 10, temp % 10); | |
296 | return -ENODEV; | |
9cb7d184 SW |
297 | } |
298 | ||
71163c7c | 299 | strlcpy(info->type, "atxp1", I2C_NAME_SIZE); |
9cb7d184 | 300 | |
71163c7c JD |
301 | return 0; |
302 | } | |
9cb7d184 | 303 | |
11f7e494 | 304 | static int atxp1_probe(struct i2c_client *client, |
71163c7c JD |
305 | const struct i2c_device_id *id) |
306 | { | |
11f7e494 | 307 | struct device *dev = &client->dev; |
71163c7c | 308 | struct atxp1_data *data; |
11f7e494 | 309 | struct device *hwmon_dev; |
9cb7d184 | 310 | |
11f7e494 | 311 | data = devm_kzalloc(dev, sizeof(struct atxp1_data), GFP_KERNEL); |
d466a353 GR |
312 | if (!data) |
313 | return -ENOMEM; | |
9cb7d184 | 314 | |
71163c7c JD |
315 | /* Get VRM */ |
316 | data->vrm = vid_which_vrm(); | |
317 | ||
11f7e494 | 318 | data->client = client; |
71163c7c JD |
319 | mutex_init(&data->update_lock); |
320 | ||
11f7e494 AL |
321 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
322 | data, | |
323 | atxp1_groups); | |
324 | if (IS_ERR(hwmon_dev)) | |
325 | return PTR_ERR(hwmon_dev); | |
9cb7d184 | 326 | |
11f7e494 | 327 | dev_info(dev, "Using VRM: %d.%d\n", data->vrm / 10, data->vrm % 10); |
943b0830 | 328 | |
71163c7c | 329 | return 0; |
9cb7d184 SW |
330 | }; |
331 | ||
8dea1b4e AL |
332 | static const struct i2c_device_id atxp1_id[] = { |
333 | { "atxp1", 0 }, | |
334 | { } | |
335 | }; | |
336 | MODULE_DEVICE_TABLE(i2c, atxp1_id); | |
337 | ||
338 | static struct i2c_driver atxp1_driver = { | |
339 | .class = I2C_CLASS_HWMON, | |
340 | .driver = { | |
341 | .name = "atxp1", | |
342 | }, | |
343 | .probe = atxp1_probe, | |
8dea1b4e AL |
344 | .id_table = atxp1_id, |
345 | .detect = atxp1_detect, | |
346 | .address_list = normal_i2c, | |
347 | }; | |
348 | ||
f0967eea | 349 | module_i2c_driver(atxp1_driver); |