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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 | * The ATXP1 can reside on I2C addresses 0x37 or 0x4e. The chip is | |
16 | * not auto-detected by the driver and must be instantiated explicitly. | |
17 | * See Documentation/i2c/instantiating-devices for more information. | |
18 | */ | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/jiffies.h> | |
24 | #include <linux/i2c.h> | |
25 | #include <linux/hwmon.h> | |
26 | #include <linux/hwmon-vid.h> | |
27 | #include <linux/err.h> | |
28 | #include <linux/mutex.h> | |
29 | #include <linux/sysfs.h> | |
30 | #include <linux/slab.h> | |
31 | ||
32 | MODULE_LICENSE("GPL"); | |
33 | MODULE_DESCRIPTION("System voltages control via Attansic ATXP1"); | |
34 | MODULE_VERSION("0.6.3"); | |
35 | MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>"); | |
36 | ||
37 | #define ATXP1_VID 0x00 | |
38 | #define ATXP1_CVID 0x01 | |
39 | #define ATXP1_GPIO1 0x06 | |
40 | #define ATXP1_GPIO2 0x0a | |
41 | #define ATXP1_VIDENA 0x20 | |
42 | #define ATXP1_VIDMASK 0x1f | |
43 | #define ATXP1_GPIO1MASK 0x0f | |
44 | ||
45 | struct atxp1_data { | |
46 | struct i2c_client *client; | |
47 | struct mutex update_lock; | |
48 | unsigned long last_updated; | |
49 | u8 valid; | |
50 | struct { | |
51 | u8 vid; /* VID output register */ | |
52 | u8 cpu_vid; /* VID input from CPU */ | |
53 | u8 gpio1; /* General purpose I/O register 1 */ | |
54 | u8 gpio2; /* General purpose I/O register 2 */ | |
55 | } reg; | |
56 | u8 vrm; /* Detected CPU VRM */ | |
57 | }; | |
58 | ||
59 | static struct atxp1_data *atxp1_update_device(struct device *dev) | |
60 | { | |
61 | struct atxp1_data *data = dev_get_drvdata(dev); | |
62 | struct i2c_client *client = data->client; | |
63 | ||
64 | mutex_lock(&data->update_lock); | |
65 | ||
66 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
67 | ||
68 | /* Update local register data */ | |
69 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
70 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, | |
71 | ATXP1_CVID); | |
72 | data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1); | |
73 | data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2); | |
74 | ||
75 | data->valid = 1; | |
76 | } | |
77 | ||
78 | mutex_unlock(&data->update_lock); | |
79 | ||
80 | return data; | |
81 | } | |
82 | ||
83 | /* sys file functions for cpu0_vid */ | |
84 | static ssize_t atxp1_showvcore(struct device *dev, | |
85 | struct device_attribute *attr, char *buf) | |
86 | { | |
87 | int size; | |
88 | struct atxp1_data *data; | |
89 | ||
90 | data = atxp1_update_device(dev); | |
91 | ||
92 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, | |
93 | data->vrm)); | |
94 | ||
95 | return size; | |
96 | } | |
97 | ||
98 | static ssize_t atxp1_storevcore(struct device *dev, | |
99 | struct device_attribute *attr, | |
100 | const char *buf, size_t count) | |
101 | { | |
102 | struct atxp1_data *data = atxp1_update_device(dev); | |
103 | struct i2c_client *client = data->client; | |
104 | int vid, cvid; | |
105 | unsigned long vcore; | |
106 | int err; | |
107 | ||
108 | err = kstrtoul(buf, 10, &vcore); | |
109 | if (err) | |
110 | return err; | |
111 | ||
112 | vcore /= 25; | |
113 | vcore *= 25; | |
114 | ||
115 | /* Calculate VID */ | |
116 | vid = vid_to_reg(vcore, data->vrm); | |
117 | if (vid < 0) { | |
118 | dev_err(dev, "VID calculation failed.\n"); | |
119 | return vid; | |
120 | } | |
121 | ||
122 | /* | |
123 | * If output enabled, use control register value. | |
124 | * Otherwise original CPU VID | |
125 | */ | |
126 | if (data->reg.vid & ATXP1_VIDENA) | |
127 | cvid = data->reg.vid & ATXP1_VIDMASK; | |
128 | else | |
129 | cvid = data->reg.cpu_vid; | |
130 | ||
131 | /* Nothing changed, aborting */ | |
132 | if (vid == cvid) | |
133 | return count; | |
134 | ||
135 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", (int)vcore, vid); | |
136 | ||
137 | /* Write every 25 mV step to increase stability */ | |
138 | if (cvid > vid) { | |
139 | for (; cvid >= vid; cvid--) | |
140 | i2c_smbus_write_byte_data(client, | |
141 | ATXP1_VID, cvid | ATXP1_VIDENA); | |
142 | } else { | |
143 | for (; cvid <= vid; cvid++) | |
144 | i2c_smbus_write_byte_data(client, | |
145 | ATXP1_VID, cvid | ATXP1_VIDENA); | |
146 | } | |
147 | ||
148 | data->valid = 0; | |
149 | ||
150 | return count; | |
151 | } | |
152 | ||
153 | /* | |
154 | * CPU core reference voltage | |
155 | * unit: millivolt | |
156 | */ | |
157 | static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, | |
158 | atxp1_storevcore); | |
159 | ||
160 | /* sys file functions for GPIO1 */ | |
161 | static ssize_t atxp1_showgpio1(struct device *dev, | |
162 | struct device_attribute *attr, char *buf) | |
163 | { | |
164 | int size; | |
165 | struct atxp1_data *data; | |
166 | ||
167 | data = atxp1_update_device(dev); | |
168 | ||
169 | size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK); | |
170 | ||
171 | return size; | |
172 | } | |
173 | ||
174 | static ssize_t atxp1_storegpio1(struct device *dev, | |
175 | struct device_attribute *attr, const char *buf, | |
176 | size_t count) | |
177 | { | |
178 | struct atxp1_data *data = atxp1_update_device(dev); | |
179 | struct i2c_client *client = data->client; | |
180 | unsigned long value; | |
181 | int err; | |
182 | ||
183 | err = kstrtoul(buf, 16, &value); | |
184 | if (err) | |
185 | return err; | |
186 | ||
187 | value &= ATXP1_GPIO1MASK; | |
188 | ||
189 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
190 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); | |
191 | ||
192 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
193 | ||
194 | data->valid = 0; | |
195 | } | |
196 | ||
197 | return count; | |
198 | } | |
199 | ||
200 | /* | |
201 | * GPIO1 data register | |
202 | * unit: Four bit as hex (e.g. 0x0f) | |
203 | */ | |
204 | static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1); | |
205 | ||
206 | /* sys file functions for GPIO2 */ | |
207 | static ssize_t atxp1_showgpio2(struct device *dev, | |
208 | struct device_attribute *attr, char *buf) | |
209 | { | |
210 | int size; | |
211 | struct atxp1_data *data; | |
212 | ||
213 | data = atxp1_update_device(dev); | |
214 | ||
215 | size = sprintf(buf, "0x%02x\n", data->reg.gpio2); | |
216 | ||
217 | return size; | |
218 | } | |
219 | ||
220 | static ssize_t atxp1_storegpio2(struct device *dev, | |
221 | struct device_attribute *attr, | |
222 | const char *buf, size_t count) | |
223 | { | |
224 | struct atxp1_data *data = atxp1_update_device(dev); | |
225 | struct i2c_client *client = data->client; | |
226 | unsigned long value; | |
227 | int err; | |
228 | ||
229 | err = kstrtoul(buf, 16, &value); | |
230 | if (err) | |
231 | return err; | |
232 | value &= 0xff; | |
233 | ||
234 | if (value != data->reg.gpio2) { | |
235 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); | |
236 | ||
237 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
238 | ||
239 | data->valid = 0; | |
240 | } | |
241 | ||
242 | return count; | |
243 | } | |
244 | ||
245 | /* | |
246 | * GPIO2 data register | |
247 | * unit: Eight bit as hex (e.g. 0xff) | |
248 | */ | |
249 | static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2); | |
250 | ||
251 | static struct attribute *atxp1_attrs[] = { | |
252 | &dev_attr_gpio1.attr, | |
253 | &dev_attr_gpio2.attr, | |
254 | &dev_attr_cpu0_vid.attr, | |
255 | NULL | |
256 | }; | |
257 | ATTRIBUTE_GROUPS(atxp1); | |
258 | ||
259 | static int atxp1_probe(struct i2c_client *client, | |
260 | const struct i2c_device_id *id) | |
261 | { | |
262 | struct device *dev = &client->dev; | |
263 | struct atxp1_data *data; | |
264 | struct device *hwmon_dev; | |
265 | ||
266 | data = devm_kzalloc(dev, sizeof(struct atxp1_data), GFP_KERNEL); | |
267 | if (!data) | |
268 | return -ENOMEM; | |
269 | ||
270 | /* Get VRM */ | |
271 | data->vrm = vid_which_vrm(); | |
272 | if (data->vrm != 90 && data->vrm != 91) { | |
273 | dev_err(dev, "atxp1: Not supporting VRM %d.%d\n", | |
274 | data->vrm / 10, data->vrm % 10); | |
275 | return -ENODEV; | |
276 | } | |
277 | ||
278 | data->client = client; | |
279 | mutex_init(&data->update_lock); | |
280 | ||
281 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, | |
282 | data, | |
283 | atxp1_groups); | |
284 | if (IS_ERR(hwmon_dev)) | |
285 | return PTR_ERR(hwmon_dev); | |
286 | ||
287 | dev_info(dev, "Using VRM: %d.%d\n", data->vrm / 10, data->vrm % 10); | |
288 | ||
289 | return 0; | |
290 | }; | |
291 | ||
292 | static const struct i2c_device_id atxp1_id[] = { | |
293 | { "atxp1", 0 }, | |
294 | { } | |
295 | }; | |
296 | MODULE_DEVICE_TABLE(i2c, atxp1_id); | |
297 | ||
298 | static struct i2c_driver atxp1_driver = { | |
299 | .class = I2C_CLASS_HWMON, | |
300 | .driver = { | |
301 | .name = "atxp1", | |
302 | }, | |
303 | .probe = atxp1_probe, | |
304 | .id_table = atxp1_id, | |
305 | }; | |
306 | ||
307 | module_i2c_driver(atxp1_driver); |