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authorSebastian Witt <se.witt@gmx.net>2005-04-13 16:27:53 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2005-06-22 00:51:50 -0400
commit9cb7d18433ea6db04b3999e8d0b8f52fba551c2d (patch)
tree0feff7401b43c5b3b2def0ae64db8f6c385a596b /drivers/i2c/chips/atxp1.c
parent3886246a257e828248ce1e72ced00408a3557f0d (diff)
[PATCH] I2C: add new atxp1 driver
Adds support for the Attansic ATXP1 I2C device, found on some x86 plattforms to change CPU and other voltages. Depends on the previous i2c-vid.h patch. Signed-off-by: Sebastian Witt <se.witt@gmx.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/i2c/chips/atxp1.c')
-rw-r--r--drivers/i2c/chips/atxp1.c361
1 files changed, 361 insertions, 0 deletions
diff --git a/drivers/i2c/chips/atxp1.c b/drivers/i2c/chips/atxp1.c
new file mode 100644
index 000000000000..570b36c6c2ac
--- /dev/null
+++ b/drivers/i2c/chips/atxp1.c
@@ -0,0 +1,361 @@
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/i2c.h>
25#include <linux/i2c-sensor.h>
26#include <linux/i2c-vid.h>
27
28MODULE_LICENSE("GPL");
29MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
30MODULE_VERSION("0.6.2");
31MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>");
32
33#define ATXP1_VID 0x00
34#define ATXP1_CVID 0x01
35#define ATXP1_GPIO1 0x06
36#define ATXP1_GPIO2 0x0a
37#define ATXP1_VIDENA 0x20
38#define ATXP1_VIDMASK 0x1f
39#define ATXP1_GPIO1MASK 0x0f
40
41static unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
42static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
43
44SENSORS_INSMOD_1(atxp1);
45
46static int atxp1_attach_adapter(struct i2c_adapter * adapter);
47static int atxp1_detach_client(struct i2c_client * client);
48static struct atxp1_data * atxp1_update_device(struct device *dev);
49static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind);
50
51static struct i2c_driver atxp1_driver = {
52 .owner = THIS_MODULE,
53 .name = "atxp1",
54 .flags = I2C_DF_NOTIFY,
55 .attach_adapter = atxp1_attach_adapter,
56 .detach_client = atxp1_detach_client,
57};
58
59struct atxp1_data {
60 struct i2c_client client;
61 struct semaphore update_lock;
62 unsigned long last_updated;
63 u8 valid;
64 struct {
65 u8 vid; /* VID output register */
66 u8 cpu_vid; /* VID input from CPU */
67 u8 gpio1; /* General purpose I/O register 1 */
68 u8 gpio2; /* General purpose I/O register 2 */
69 } reg;
70 u8 vrm; /* Detected CPU VRM */
71};
72
73static struct atxp1_data * atxp1_update_device(struct device *dev)
74{
75 struct i2c_client *client;
76 struct atxp1_data *data;
77
78 client = to_i2c_client(dev);
79 data = i2c_get_clientdata(client);
80
81 down(&data->update_lock);
82
83 if ((jiffies - data->last_updated > HZ) ||
84 (jiffies < data->last_updated) ||
85 !data->valid) {
86
87 /* Update local register data */
88 data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID);
89 data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID);
90 data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1);
91 data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2);
92
93 data->valid = 1;
94 }
95
96 up(&data->update_lock);
97
98 return(data);
99}
100
101/* sys file functions for cpu0_vid */
102ssize_t atxp1_showvcore(struct device *dev, char *buf)
103{
104 int size;
105 struct atxp1_data *data;
106
107 data = atxp1_update_device(dev);
108
109 size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm));
110
111 return size;
112}
113
114ssize_t atxp1_storevcore(struct device *dev, const char* buf, size_t count)
115{
116 struct atxp1_data *data;
117 struct i2c_client *client;
118 char vid;
119 char cvid;
120 unsigned int vcore;
121
122 client = to_i2c_client(dev);
123 data = atxp1_update_device(dev);
124
125 vcore = simple_strtoul(buf, NULL, 10);
126 vcore /= 25;
127 vcore *= 25;
128
129 /* Calculate VID */
130 vid = vid_to_reg(vcore, data->vrm);
131
132 if (vid < 0) {
133 dev_err(dev, "VID calculation failed.\n");
134 return -1;
135 }
136
137 /* If output enabled, use control register value. Otherwise original CPU VID */
138 if (data->reg.vid & ATXP1_VIDENA)
139 cvid = data->reg.vid & ATXP1_VIDMASK;
140 else
141 cvid = data->reg.cpu_vid;
142
143 /* Nothing changed, aborting */
144 if (vid == cvid)
145 return count;
146
147 dev_info(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid);
148
149 /* Write every 25 mV step to increase stability */
150 if (cvid > vid) {
151 for (; cvid >= vid; cvid--) {
152 i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
153 }
154 }
155 else {
156 for (; cvid <= vid; cvid++) {
157 i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
158 }
159 }
160
161 data->valid = 0;
162
163 return count;
164}
165
166/* CPU core reference voltage
167 unit: millivolt
168*/
169static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore);
170
171/* sys file functions for GPIO1 */
172ssize_t atxp1_showgpio1(struct device *dev, char *buf)
173{
174 int size;
175 struct atxp1_data *data;
176
177 data = atxp1_update_device(dev);
178
179 size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);
180
181 return size;
182}
183
184ssize_t atxp1_storegpio1(struct device *dev, const char* buf, size_t count)
185{
186 struct atxp1_data *data;
187 struct i2c_client *client;
188 unsigned int value;
189
190 client = to_i2c_client(dev);
191 data = atxp1_update_device(dev);
192
193 value = simple_strtoul(buf, NULL, 16);
194
195 value &= ATXP1_GPIO1MASK;
196
197 if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
198 dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
199
200 i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);
201
202 data->valid = 0;
203 }
204
205 return count;
206}
207
208/* GPIO1 data register
209 unit: Four bit as hex (e.g. 0x0f)
210*/
211static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1);
212
213/* sys file functions for GPIO2 */
214ssize_t atxp1_showgpio2(struct device *dev, char *buf)
215{
216 int size;
217 struct atxp1_data *data;
218
219 data = atxp1_update_device(dev);
220
221 size = sprintf(buf, "0x%02x\n", data->reg.gpio2);
222
223 return size;
224}
225
226ssize_t atxp1_storegpio2(struct device *dev, const char* buf, size_t count)
227{
228 struct atxp1_data *data;
229 struct i2c_client *client;
230 unsigned int value;
231
232 client = to_i2c_client(dev);
233 data = atxp1_update_device(dev);
234
235 value = simple_strtoul(buf, NULL, 16) & 0xff;
236
237 if (value != data->reg.gpio2) {
238 dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
239
240 i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);
241
242 data->valid = 0;
243 }
244
245 return count;
246}
247
248/* GPIO2 data register
249 unit: Eight bit as hex (e.g. 0xff)
250*/
251static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2);
252
253
254static int atxp1_attach_adapter(struct i2c_adapter *adapter)
255{
256 return i2c_detect(adapter, &addr_data, &atxp1_detect);
257};
258
259static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind)
260{
261 struct i2c_client * new_client;
262 struct atxp1_data * data;
263 int err = 0;
264 u8 temp;
265
266 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
267 goto exit;
268
269 if (!(data = kmalloc(sizeof(struct atxp1_data), GFP_KERNEL))) {
270 err = -ENOMEM;
271 goto exit;
272 }
273
274 memset(data, 0, sizeof(struct atxp1_data));
275 new_client = &data->client;
276 i2c_set_clientdata(new_client, data);
277
278 new_client->addr = address;
279 new_client->adapter = adapter;
280 new_client->driver = &atxp1_driver;
281 new_client->flags = 0;
282
283 /* Detect ATXP1, checking if vendor ID registers are all zero */
284 if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) &&
285 (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) &&
286 (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) &&
287 (i2c_smbus_read_byte_data(new_client, 0xff) == 0) )) {
288
289 /* No vendor ID, now checking if registers 0x10,0x11 (non-existent)
290 * showing the same as register 0x00 */
291 temp = i2c_smbus_read_byte_data(new_client, 0x00);
292
293 if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
294 (i2c_smbus_read_byte_data(new_client, 0x11) == temp) ))
295 goto exit_free;
296 }
297
298 /* Get VRM */
299 data->vrm = i2c_which_vrm();
300
301 if ((data->vrm != 90) && (data->vrm != 91)) {
302 dev_err(&new_client->dev, "Not supporting VRM %d.%d\n",
303 data->vrm / 10, data->vrm % 10);
304 goto exit_free;
305 }
306
307 strncpy(new_client->name, "atxp1", I2C_NAME_SIZE);
308
309 data->valid = 0;
310
311 init_MUTEX(&data->update_lock);
312
313 err = i2c_attach_client(new_client);
314
315 if (err)
316 {
317 dev_err(&new_client->dev, "Attach client error.\n");
318 goto exit_free;
319 }
320
321 device_create_file(&new_client->dev, &dev_attr_gpio1);
322 device_create_file(&new_client->dev, &dev_attr_gpio2);
323 device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
324
325 dev_info(&new_client->dev, "Using VRM: %d.%d\n",
326 data->vrm / 10, data->vrm % 10);
327
328 return 0;
329
330exit_free:
331 kfree(data);
332exit:
333 return err;
334};
335
336static int atxp1_detach_client(struct i2c_client * client)
337{
338 int err;
339
340 err = i2c_detach_client(client);
341
342 if (err)
343 dev_err(&client->dev, "Failed to detach client.\n");
344 else
345 kfree(i2c_get_clientdata(client));
346
347 return err;
348};
349
350static int __init atxp1_init(void)
351{
352 return i2c_add_driver(&atxp1_driver);
353};
354
355static void __exit atxp1_exit(void)
356{
357 i2c_del_driver(&atxp1_driver);
358};
359
360module_init(atxp1_init);
361module_exit(atxp1_exit);