Merge branch 'integrity-check-patch-v2' of git://btrfs.giantdisaster.de/git/btrfs...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / atxp1.c
blob33cc143b2069442c5ba80611904b4c394436af9e
1 /*
2 atxp1.c - kernel module for setting CPU VID and general purpose
3 I/Os using the Attansic ATXP1 chip.
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.
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.
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.
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>
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>");
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
46 static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
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);
54 static const struct i2c_device_id atxp1_id[] = {
55 { "atxp1", 0 },
56 { }
58 MODULE_DEVICE_TABLE(i2c, atxp1_id);
60 static struct i2c_driver atxp1_driver = {
61 .class = I2C_CLASS_HWMON,
62 .driver = {
63 .name = "atxp1",
65 .probe = atxp1_probe,
66 .remove = atxp1_remove,
67 .id_table = atxp1_id,
68 .detect = atxp1_detect,
69 .address_list = normal_i2c,
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 */
86 static struct atxp1_data * atxp1_update_device(struct device *dev)
88 struct i2c_client *client;
89 struct atxp1_data *data;
91 client = to_i2c_client(dev);
92 data = i2c_get_clientdata(client);
94 mutex_lock(&data->update_lock);
96 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
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);
104 data->valid = 1;
107 mutex_unlock(&data->update_lock);
109 return(data);
112 /* sys file functions for cpu0_vid */
113 static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, char *buf)
115 int size;
116 struct atxp1_data *data;
118 data = atxp1_update_device(dev);
120 size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm));
122 return size;
125 static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
127 struct atxp1_data *data;
128 struct i2c_client *client;
129 int vid, cvid;
130 unsigned int vcore;
132 client = to_i2c_client(dev);
133 data = atxp1_update_device(dev);
135 vcore = simple_strtoul(buf, NULL, 10);
136 vcore /= 25;
137 vcore *= 25;
139 /* Calculate VID */
140 vid = vid_to_reg(vcore, data->vrm);
142 if (vid < 0) {
143 dev_err(dev, "VID calculation failed.\n");
144 return -1;
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;
153 /* Nothing changed, aborting */
154 if (vid == cvid)
155 return count;
157 dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid);
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);
165 else {
166 for (; cvid <= vid; cvid++) {
167 i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
171 data->valid = 0;
173 return count;
176 /* CPU core reference voltage
177 unit: millivolt
179 static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore);
181 /* sys file functions for GPIO1 */
182 static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, char *buf)
184 int size;
185 struct atxp1_data *data;
187 data = atxp1_update_device(dev);
189 size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);
191 return size;
194 static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, const char*buf, size_t count)
196 struct atxp1_data *data;
197 struct i2c_client *client;
198 unsigned int value;
200 client = to_i2c_client(dev);
201 data = atxp1_update_device(dev);
203 value = simple_strtoul(buf, NULL, 16);
205 value &= ATXP1_GPIO1MASK;
207 if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
208 dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
210 i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);
212 data->valid = 0;
215 return count;
218 /* GPIO1 data register
219 unit: Four bit as hex (e.g. 0x0f)
221 static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1);
223 /* sys file functions for GPIO2 */
224 static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf)
226 int size;
227 struct atxp1_data *data;
229 data = atxp1_update_device(dev);
231 size = sprintf(buf, "0x%02x\n", data->reg.gpio2);
233 return size;
236 static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
238 struct atxp1_data *data;
239 struct i2c_client *client;
240 unsigned int value;
242 client = to_i2c_client(dev);
243 data = atxp1_update_device(dev);
245 value = simple_strtoul(buf, NULL, 16) & 0xff;
247 if (value != data->reg.gpio2) {
248 dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
250 i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);
252 data->valid = 0;
255 return count;
258 /* GPIO2 data register
259 unit: Eight bit as hex (e.g. 0xff)
261 static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2);
263 static struct attribute *atxp1_attributes[] = {
264 &dev_attr_gpio1.attr,
265 &dev_attr_gpio2.attr,
266 &dev_attr_cpu0_vid.attr,
267 NULL
270 static const struct attribute_group atxp1_group = {
271 .attrs = atxp1_attributes,
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)
279 struct i2c_adapter *adapter = new_client->adapter;
281 u8 temp;
283 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
284 return -ENODEV;
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;
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);
297 if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
298 (i2c_smbus_read_byte_data(new_client, 0x11) == temp)))
299 return -ENODEV;
301 /* Get VRM */
302 temp = vid_which_vrm();
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;
310 strlcpy(info->type, "atxp1", I2C_NAME_SIZE);
312 return 0;
315 static int atxp1_probe(struct i2c_client *new_client,
316 const struct i2c_device_id *id)
318 struct atxp1_data *data;
319 int err;
321 data = kzalloc(sizeof(struct atxp1_data), GFP_KERNEL);
322 if (!data) {
323 err = -ENOMEM;
324 goto exit;
327 /* Get VRM */
328 data->vrm = vid_which_vrm();
330 i2c_set_clientdata(new_client, data);
331 data->valid = 0;
333 mutex_init(&data->update_lock);
335 /* Register sysfs hooks */
336 if ((err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group)))
337 goto exit_free;
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;
345 dev_info(&new_client->dev, "Using VRM: %d.%d\n",
346 data->vrm / 10, data->vrm % 10);
348 return 0;
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;
358 static int atxp1_remove(struct i2c_client *client)
360 struct atxp1_data * data = i2c_get_clientdata(client);
362 hwmon_device_unregister(data->hwmon_dev);
363 sysfs_remove_group(&client->dev.kobj, &atxp1_group);
365 kfree(data);
367 return 0;
370 static int __init atxp1_init(void)
372 return i2c_add_driver(&atxp1_driver);
375 static void __exit atxp1_exit(void)
377 i2c_del_driver(&atxp1_driver);
380 module_init(atxp1_init);
381 module_exit(atxp1_exit);