blob: 33cc143b2069442c5ba80611904b4c394436af9e [file] [log] [blame]
Sebastian Witt9cb7d182005-04-13 22:27:53 +02001/*
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>
Jean Delvare0cacdf22005-07-29 12:15:12 -070024#include <linux/jiffies.h>
Sebastian Witt9cb7d182005-04-13 22:27:53 +020025#include <linux/i2c.h>
Mark M. Hoffman943b0832005-07-15 21:39:18 -040026#include <linux/hwmon.h>
Jean Delvare303760b2005-07-31 21:52:01 +020027#include <linux/hwmon-vid.h>
Mark M. Hoffman943b0832005-07-15 21:39:18 -040028#include <linux/err.h>
Ingo Molnar9a61bf62006-01-18 23:19:26 +010029#include <linux/mutex.h>
Jean Delvarea5ebe662006-09-24 21:24:46 +020030#include <linux/sysfs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Sebastian Witt9cb7d182005-04-13 22:27:53 +020032
33MODULE_LICENSE("GPL");
34MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
Jean Delvare13b3c3f2008-09-20 10:25:19 +020035MODULE_VERSION("0.6.3");
Sebastian Witt9cb7d182005-04-13 22:27:53 +020036MODULE_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
Mark M. Hoffman25e9c862008-02-17 22:28:03 -050046static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
Sebastian Witt9cb7d182005-04-13 22:27:53 +020047
Jean Delvare71163c72008-07-16 19:30:11 +020048static int atxp1_probe(struct i2c_client *client,
49 const struct i2c_device_id *id);
50static int atxp1_remove(struct i2c_client *client);
Sebastian Witt9cb7d182005-04-13 22:27:53 +020051static struct atxp1_data * atxp1_update_device(struct device *dev);
Jean Delvare310ec792009-12-14 21:17:23 +010052static int atxp1_detect(struct i2c_client *client, struct i2c_board_info *info);
Jean Delvare71163c72008-07-16 19:30:11 +020053
54static const struct i2c_device_id atxp1_id[] = {
Jean Delvare1f86df42009-12-14 21:17:26 +010055 { "atxp1", 0 },
Jean Delvare71163c72008-07-16 19:30:11 +020056 { }
57};
58MODULE_DEVICE_TABLE(i2c, atxp1_id);
Sebastian Witt9cb7d182005-04-13 22:27:53 +020059
60static struct i2c_driver atxp1_driver = {
Jean Delvare71163c72008-07-16 19:30:11 +020061 .class = I2C_CLASS_HWMON,
Laurent Riffardcdaf7932005-11-26 20:37:41 +010062 .driver = {
Laurent Riffardcdaf7932005-11-26 20:37:41 +010063 .name = "atxp1",
64 },
Jean Delvare71163c72008-07-16 19:30:11 +020065 .probe = atxp1_probe,
66 .remove = atxp1_remove,
67 .id_table = atxp1_id,
68 .detect = atxp1_detect,
Jean Delvarec3813d62009-12-14 21:17:25 +010069 .address_list = normal_i2c,
Sebastian Witt9cb7d182005-04-13 22:27:53 +020070};
71
72struct atxp1_data {
Tony Jones1beeffe2007-08-20 13:46:20 -070073 struct device *hwmon_dev;
Ingo Molnar9a61bf62006-01-18 23:19:26 +010074 struct mutex update_lock;
Sebastian Witt9cb7d182005-04-13 22:27:53 +020075 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
86static 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
Ingo Molnar9a61bf62006-01-18 23:19:26 +010094 mutex_lock(&data->update_lock);
Sebastian Witt9cb7d182005-04-13 22:27:53 +020095
Jean Delvare0cacdf22005-07-29 12:15:12 -070096 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
Sebastian Witt9cb7d182005-04-13 22:27:53 +020097
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
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100107 mutex_unlock(&data->update_lock);
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200108
109 return(data);
110}
111
112/* sys file functions for cpu0_vid */
Greg Kroah-Hartman6f637a62005-06-21 21:01:59 -0700113static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, char *buf)
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200114{
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
Greg Kroah-Hartman6f637a62005-06-21 21:01:59 -0700125static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200126{
127 struct atxp1_data *data;
128 struct i2c_client *client;
Alexey Dobriyanc41bdb52006-08-28 14:18:14 +0200129 int vid, cvid;
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200130 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
Prakash Punnoor164cad92005-06-29 14:13:54 +0200157 dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid);
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200158
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*/
179static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore);
180
181/* sys file functions for GPIO1 */
Greg Kroah-Hartman6f637a62005-06-21 21:01:59 -0700182static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, char *buf)
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200183{
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
Greg Kroah-Hartman6f637a62005-06-21 21:01:59 -0700194static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, const char*buf, size_t count)
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200195{
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*/
221static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1);
222
223/* sys file functions for GPIO2 */
Greg Kroah-Hartman6f637a62005-06-21 21:01:59 -0700224static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf)
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200225{
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
Greg Kroah-Hartman6f637a62005-06-21 21:01:59 -0700236static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200237{
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*/
261static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2);
262
Jean Delvarea5ebe662006-09-24 21:24:46 +0200263static struct attribute *atxp1_attributes[] = {
264 &dev_attr_gpio1.attr,
265 &dev_attr_gpio2.attr,
266 &dev_attr_cpu0_vid.attr,
267 NULL
268};
269
270static const struct attribute_group atxp1_group = {
271 .attrs = atxp1_attributes,
272};
273
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200274
Jean Delvare71163c72008-07-16 19:30:11 +0200275/* Return 0 if detection is successful, -ENODEV otherwise */
Jean Delvare310ec792009-12-14 21:17:23 +0100276static int atxp1_detect(struct i2c_client *new_client,
Jean Delvare71163c72008-07-16 19:30:11 +0200277 struct i2c_board_info *info)
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200278{
Jean Delvare71163c72008-07-16 19:30:11 +0200279 struct i2c_adapter *adapter = new_client->adapter;
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200280
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200281 u8 temp;
282
283 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
Jean Delvare71163c72008-07-16 19:30:11 +0200284 return -ENODEV;
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200285
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) &&
Jean Delvare13b3c3f2008-09-20 10:25:19 +0200290 (i2c_smbus_read_byte_data(new_client, 0xff) == 0)))
291 return -ENODEV;
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200292
Jean Delvare13b3c3f2008-09-20 10:25:19 +0200293 /* 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);
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200296
Jean Delvare13b3c3f2008-09-20 10:25:19 +0200297 if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
298 (i2c_smbus_read_byte_data(new_client, 0x11) == temp)))
299 return -ENODEV;
Jean Delvare71163c72008-07-16 19:30:11 +0200300
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
315static 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;
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200325 }
326
327 /* Get VRM */
Jean Delvare303760b2005-07-31 21:52:01 +0200328 data->vrm = vid_which_vrm();
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200329
Jean Delvare71163c72008-07-16 19:30:11 +0200330 i2c_set_clientdata(new_client, data);
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200331 data->valid = 0;
332
Ingo Molnar9a61bf62006-01-18 23:19:26 +0100333 mutex_init(&data->update_lock);
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200334
Jean Delvarea5ebe662006-09-24 21:24:46 +0200335 /* Register sysfs hooks */
336 if ((err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group)))
Jean Delvare71163c72008-07-16 19:30:11 +0200337 goto exit_free;
Jean Delvarea5ebe662006-09-24 21:24:46 +0200338
Tony Jones1beeffe2007-08-20 13:46:20 -0700339 data->hwmon_dev = hwmon_device_register(&new_client->dev);
340 if (IS_ERR(data->hwmon_dev)) {
341 err = PTR_ERR(data->hwmon_dev);
Jean Delvarea5ebe662006-09-24 21:24:46 +0200342 goto exit_remove_files;
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400343 }
344
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200345 dev_info(&new_client->dev, "Using VRM: %d.%d\n",
346 data->vrm / 10, data->vrm % 10);
347
348 return 0;
349
Jean Delvarea5ebe662006-09-24 21:24:46 +0200350exit_remove_files:
351 sysfs_remove_group(&new_client->dev.kobj, &atxp1_group);
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200352exit_free:
353 kfree(data);
354exit:
355 return err;
356};
357
Jean Delvare71163c72008-07-16 19:30:11 +0200358static int atxp1_remove(struct i2c_client *client)
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200359{
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400360 struct atxp1_data * data = i2c_get_clientdata(client);
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200361
Tony Jones1beeffe2007-08-20 13:46:20 -0700362 hwmon_device_unregister(data->hwmon_dev);
Jean Delvarea5ebe662006-09-24 21:24:46 +0200363 sysfs_remove_group(&client->dev.kobj, &atxp1_group);
Mark M. Hoffman943b0832005-07-15 21:39:18 -0400364
Jean Delvare71163c72008-07-16 19:30:11 +0200365 kfree(data);
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200366
Jean Delvare71163c72008-07-16 19:30:11 +0200367 return 0;
Sebastian Witt9cb7d182005-04-13 22:27:53 +0200368};
369
370static int __init atxp1_init(void)
371{
372 return i2c_add_driver(&atxp1_driver);
373};
374
375static void __exit atxp1_exit(void)
376{
377 i2c_del_driver(&atxp1_driver);
378};
379
380module_init(atxp1_init);
381module_exit(atxp1_exit);