Loading...
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/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>
32
33MODULE_LICENSE("GPL");
34MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
35MODULE_VERSION("0.6.3");
36MODULE_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
46static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
47
48static int atxp1_probe(struct i2c_client *client,
49 const struct i2c_device_id *id);
50static int atxp1_remove(struct i2c_client *client);
51static struct atxp1_data * atxp1_update_device(struct device *dev);
52static int atxp1_detect(struct i2c_client *client, struct i2c_board_info *info);
53
54static const struct i2c_device_id atxp1_id[] = {
55 { "atxp1", 0 },
56 { }
57};
58MODULE_DEVICE_TABLE(i2c, atxp1_id);
59
60static struct i2c_driver atxp1_driver = {
61 .class = I2C_CLASS_HWMON,
62 .driver = {
63 .name = "atxp1",
64 },
65 .probe = atxp1_probe,
66 .remove = atxp1_remove,
67 .id_table = atxp1_id,
68 .detect = atxp1_detect,
69 .address_list = normal_i2c,
70};
71
72struct 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 */
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
94 mutex_lock(&data->update_lock);
95
96 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
97
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
107 mutex_unlock(&data->update_lock);
108
109 return(data);
110}
111
112/* sys file functions for cpu0_vid */
113static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, char *buf)
114{
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
125static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
126{
127 struct atxp1_data *data;
128 struct i2c_client *client;
129 int vid, cvid;
130 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
157 dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid);
158
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 */
182static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, char *buf)
183{
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
194static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, const char*buf, size_t count)
195{
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 */
224static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf)
225{
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
236static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
237{
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
263static 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
274
275/* Return 0 if detection is successful, -ENODEV otherwise */
276static int atxp1_detect(struct i2c_client *new_client,
277 struct i2c_board_info *info)
278{
279 struct i2c_adapter *adapter = new_client->adapter;
280
281 u8 temp;
282
283 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
284 return -ENODEV;
285
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;
292
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);
296
297 if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
298 (i2c_smbus_read_byte_data(new_client, 0x11) == temp)))
299 return -ENODEV;
300
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;
325 }
326
327 /* Get VRM */
328 data->vrm = vid_which_vrm();
329
330 i2c_set_clientdata(new_client, data);
331 data->valid = 0;
332
333 mutex_init(&data->update_lock);
334
335 /* Register sysfs hooks */
336 if ((err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group)))
337 goto exit_free;
338
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;
343 }
344
345 dev_info(&new_client->dev, "Using VRM: %d.%d\n",
346 data->vrm / 10, data->vrm % 10);
347
348 return 0;
349
350exit_remove_files:
351 sysfs_remove_group(&new_client->dev.kobj, &atxp1_group);
352exit_free:
353 kfree(data);
354exit:
355 return err;
356};
357
358static int atxp1_remove(struct i2c_client *client)
359{
360 struct atxp1_data * data = i2c_get_clientdata(client);
361
362 hwmon_device_unregister(data->hwmon_dev);
363 sysfs_remove_group(&client->dev.kobj, &atxp1_group);
364
365 kfree(data);
366
367 return 0;
368};
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);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * atxp1.c - kernel module for setting CPU VID and general purpose
4 * I/Os using the Attansic ATXP1 chip.
5 *
6 * The ATXP1 can reside on I2C addresses 0x37 or 0x4e. The chip is
7 * not auto-detected by the driver and must be instantiated explicitly.
8 * See Documentation/i2c/instantiating-devices.rst for more information.
9 */
10
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/jiffies.h>
15#include <linux/i2c.h>
16#include <linux/hwmon.h>
17#include <linux/hwmon-vid.h>
18#include <linux/err.h>
19#include <linux/mutex.h>
20#include <linux/sysfs.h>
21#include <linux/slab.h>
22
23MODULE_LICENSE("GPL");
24MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
25MODULE_VERSION("0.6.3");
26MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>");
27
28#define ATXP1_VID 0x00
29#define ATXP1_CVID 0x01
30#define ATXP1_GPIO1 0x06
31#define ATXP1_GPIO2 0x0a
32#define ATXP1_VIDENA 0x20
33#define ATXP1_VIDMASK 0x1f
34#define ATXP1_GPIO1MASK 0x0f
35
36struct atxp1_data {
37 struct i2c_client *client;
38 struct mutex update_lock;
39 unsigned long last_updated;
40 u8 valid;
41 struct {
42 u8 vid; /* VID output register */
43 u8 cpu_vid; /* VID input from CPU */
44 u8 gpio1; /* General purpose I/O register 1 */
45 u8 gpio2; /* General purpose I/O register 2 */
46 } reg;
47 u8 vrm; /* Detected CPU VRM */
48};
49
50static struct atxp1_data *atxp1_update_device(struct device *dev)
51{
52 struct atxp1_data *data = dev_get_drvdata(dev);
53 struct i2c_client *client = data->client;
54
55 mutex_lock(&data->update_lock);
56
57 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
58
59 /* Update local register data */
60 data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID);
61 data->reg.cpu_vid = i2c_smbus_read_byte_data(client,
62 ATXP1_CVID);
63 data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1);
64 data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2);
65
66 data->valid = 1;
67 }
68
69 mutex_unlock(&data->update_lock);
70
71 return data;
72}
73
74/* sys file functions for cpu0_vid */
75static ssize_t cpu0_vid_show(struct device *dev,
76 struct device_attribute *attr, char *buf)
77{
78 int size;
79 struct atxp1_data *data;
80
81 data = atxp1_update_device(dev);
82
83 size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK,
84 data->vrm));
85
86 return size;
87}
88
89static ssize_t cpu0_vid_store(struct device *dev,
90 struct device_attribute *attr, const char *buf,
91 size_t count)
92{
93 struct atxp1_data *data = atxp1_update_device(dev);
94 struct i2c_client *client = data->client;
95 int vid, cvid;
96 unsigned long vcore;
97 int err;
98
99 err = kstrtoul(buf, 10, &vcore);
100 if (err)
101 return err;
102
103 vcore /= 25;
104 vcore *= 25;
105
106 /* Calculate VID */
107 vid = vid_to_reg(vcore, data->vrm);
108 if (vid < 0) {
109 dev_err(dev, "VID calculation failed.\n");
110 return vid;
111 }
112
113 /*
114 * If output enabled, use control register value.
115 * Otherwise original CPU VID
116 */
117 if (data->reg.vid & ATXP1_VIDENA)
118 cvid = data->reg.vid & ATXP1_VIDMASK;
119 else
120 cvid = data->reg.cpu_vid;
121
122 /* Nothing changed, aborting */
123 if (vid == cvid)
124 return count;
125
126 dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", (int)vcore, vid);
127
128 /* Write every 25 mV step to increase stability */
129 if (cvid > vid) {
130 for (; cvid >= vid; cvid--)
131 i2c_smbus_write_byte_data(client,
132 ATXP1_VID, cvid | ATXP1_VIDENA);
133 } else {
134 for (; cvid <= vid; cvid++)
135 i2c_smbus_write_byte_data(client,
136 ATXP1_VID, cvid | ATXP1_VIDENA);
137 }
138
139 data->valid = 0;
140
141 return count;
142}
143
144/*
145 * CPU core reference voltage
146 * unit: millivolt
147 */
148static DEVICE_ATTR_RW(cpu0_vid);
149
150/* sys file functions for GPIO1 */
151static ssize_t gpio1_show(struct device *dev, struct device_attribute *attr,
152 char *buf)
153{
154 int size;
155 struct atxp1_data *data;
156
157 data = atxp1_update_device(dev);
158
159 size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);
160
161 return size;
162}
163
164static ssize_t gpio1_store(struct device *dev, struct device_attribute *attr,
165 const char *buf, size_t count)
166{
167 struct atxp1_data *data = atxp1_update_device(dev);
168 struct i2c_client *client = data->client;
169 unsigned long value;
170 int err;
171
172 err = kstrtoul(buf, 16, &value);
173 if (err)
174 return err;
175
176 value &= ATXP1_GPIO1MASK;
177
178 if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
179 dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value);
180
181 i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);
182
183 data->valid = 0;
184 }
185
186 return count;
187}
188
189/*
190 * GPIO1 data register
191 * unit: Four bit as hex (e.g. 0x0f)
192 */
193static DEVICE_ATTR_RW(gpio1);
194
195/* sys file functions for GPIO2 */
196static ssize_t gpio2_show(struct device *dev, struct device_attribute *attr,
197 char *buf)
198{
199 int size;
200 struct atxp1_data *data;
201
202 data = atxp1_update_device(dev);
203
204 size = sprintf(buf, "0x%02x\n", data->reg.gpio2);
205
206 return size;
207}
208
209static ssize_t gpio2_store(struct device *dev, struct device_attribute *attr,
210 const char *buf, size_t count)
211{
212 struct atxp1_data *data = atxp1_update_device(dev);
213 struct i2c_client *client = data->client;
214 unsigned long value;
215 int err;
216
217 err = kstrtoul(buf, 16, &value);
218 if (err)
219 return err;
220 value &= 0xff;
221
222 if (value != data->reg.gpio2) {
223 dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value);
224
225 i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);
226
227 data->valid = 0;
228 }
229
230 return count;
231}
232
233/*
234 * GPIO2 data register
235 * unit: Eight bit as hex (e.g. 0xff)
236 */
237static DEVICE_ATTR_RW(gpio2);
238
239static struct attribute *atxp1_attrs[] = {
240 &dev_attr_gpio1.attr,
241 &dev_attr_gpio2.attr,
242 &dev_attr_cpu0_vid.attr,
243 NULL
244};
245ATTRIBUTE_GROUPS(atxp1);
246
247static int atxp1_probe(struct i2c_client *client,
248 const struct i2c_device_id *id)
249{
250 struct device *dev = &client->dev;
251 struct atxp1_data *data;
252 struct device *hwmon_dev;
253
254 data = devm_kzalloc(dev, sizeof(struct atxp1_data), GFP_KERNEL);
255 if (!data)
256 return -ENOMEM;
257
258 /* Get VRM */
259 data->vrm = vid_which_vrm();
260 if (data->vrm != 90 && data->vrm != 91) {
261 dev_err(dev, "atxp1: Not supporting VRM %d.%d\n",
262 data->vrm / 10, data->vrm % 10);
263 return -ENODEV;
264 }
265
266 data->client = client;
267 mutex_init(&data->update_lock);
268
269 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
270 data,
271 atxp1_groups);
272 if (IS_ERR(hwmon_dev))
273 return PTR_ERR(hwmon_dev);
274
275 dev_info(dev, "Using VRM: %d.%d\n", data->vrm / 10, data->vrm % 10);
276
277 return 0;
278};
279
280static const struct i2c_device_id atxp1_id[] = {
281 { "atxp1", 0 },
282 { }
283};
284MODULE_DEVICE_TABLE(i2c, atxp1_id);
285
286static struct i2c_driver atxp1_driver = {
287 .class = I2C_CLASS_HWMON,
288 .driver = {
289 .name = "atxp1",
290 },
291 .probe = atxp1_probe,
292 .id_table = atxp1_id,
293};
294
295module_i2c_driver(atxp1_driver);