Commit | Line | Data |
---|---|---|
c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9cb7d184 | 2 | /* |
f24d548b GR |
3 | * atxp1.c - kernel module for setting CPU VID and general purpose |
4 | * I/Os using the Attansic ATXP1 chip. | |
5 | * | |
e892b75f GR |
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. | |
ccf988b6 | 8 | * See Documentation/i2c/instantiating-devices.rst for more information. |
f24d548b | 9 | */ |
9cb7d184 SW |
10 | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
0cacdf29 | 14 | #include <linux/jiffies.h> |
9cb7d184 | 15 | #include <linux/i2c.h> |
943b0830 | 16 | #include <linux/hwmon.h> |
303760b4 | 17 | #include <linux/hwmon-vid.h> |
943b0830 | 18 | #include <linux/err.h> |
25f98688 | 19 | #include <linux/kstrtox.h> |
9a61bf63 | 20 | #include <linux/mutex.h> |
a5ebe668 | 21 | #include <linux/sysfs.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
9cb7d184 SW |
23 | |
24 | MODULE_LICENSE("GPL"); | |
25 | MODULE_DESCRIPTION("System voltages control via Attansic ATXP1"); | |
13b3c3fa | 26 | MODULE_VERSION("0.6.3"); |
9cb7d184 SW |
27 | MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>"); |
28 | ||
29 | #define ATXP1_VID 0x00 | |
30 | #define ATXP1_CVID 0x01 | |
31 | #define ATXP1_GPIO1 0x06 | |
32 | #define ATXP1_GPIO2 0x0a | |
33 | #define ATXP1_VIDENA 0x20 | |
34 | #define ATXP1_VIDMASK 0x1f | |
35 | #define ATXP1_GPIO1MASK 0x0f | |
36 | ||
9cb7d184 | 37 | struct atxp1_data { |
11f7e494 | 38 | struct i2c_client *client; |
9a61bf63 | 39 | struct mutex update_lock; |
9cb7d184 | 40 | unsigned long last_updated; |
952a11ca | 41 | bool valid; |
9cb7d184 SW |
42 | struct { |
43 | u8 vid; /* VID output register */ | |
44 | u8 cpu_vid; /* VID input from CPU */ | |
45 | u8 gpio1; /* General purpose I/O register 1 */ | |
46 | u8 gpio2; /* General purpose I/O register 2 */ | |
47 | } reg; | |
48 | u8 vrm; /* Detected CPU VRM */ | |
49 | }; | |
50 | ||
f24d548b | 51 | static struct atxp1_data *atxp1_update_device(struct device *dev) |
9cb7d184 | 52 | { |
11f7e494 AL |
53 | struct atxp1_data *data = dev_get_drvdata(dev); |
54 | struct i2c_client *client = data->client; | |
9cb7d184 | 55 | |
9a61bf63 | 56 | mutex_lock(&data->update_lock); |
9cb7d184 | 57 | |
0cacdf29 | 58 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
9cb7d184 SW |
59 | |
60 | /* Update local register data */ | |
61 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
f24d548b GR |
62 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, |
63 | ATXP1_CVID); | |
9cb7d184 SW |
64 | data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1); |
65 | data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2); | |
66 | ||
952a11ca | 67 | data->valid = true; |
9cb7d184 SW |
68 | } |
69 | ||
9a61bf63 | 70 | mutex_unlock(&data->update_lock); |
9cb7d184 | 71 | |
7fe83ad8 | 72 | return data; |
9cb7d184 SW |
73 | } |
74 | ||
75 | /* sys file functions for cpu0_vid */ | |
0acf2a5f JL |
76 | static ssize_t cpu0_vid_show(struct device *dev, |
77 | struct device_attribute *attr, char *buf) | |
9cb7d184 SW |
78 | { |
79 | int size; | |
80 | struct atxp1_data *data; | |
81 | ||
82 | data = atxp1_update_device(dev); | |
83 | ||
f24d548b GR |
84 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, |
85 | data->vrm)); | |
9cb7d184 SW |
86 | |
87 | return size; | |
88 | } | |
89 | ||
0acf2a5f JL |
90 | static ssize_t cpu0_vid_store(struct device *dev, |
91 | struct device_attribute *attr, const char *buf, | |
92 | size_t count) | |
9cb7d184 | 93 | { |
11f7e494 AL |
94 | struct atxp1_data *data = atxp1_update_device(dev); |
95 | struct i2c_client *client = data->client; | |
c41bdb52 | 96 | int vid, cvid; |
f24d548b GR |
97 | unsigned long vcore; |
98 | int err; | |
9cb7d184 | 99 | |
f24d548b GR |
100 | err = kstrtoul(buf, 10, &vcore); |
101 | if (err) | |
102 | return err; | |
103 | ||
9cb7d184 SW |
104 | vcore /= 25; |
105 | vcore *= 25; | |
106 | ||
107 | /* Calculate VID */ | |
108 | vid = vid_to_reg(vcore, data->vrm); | |
9cb7d184 SW |
109 | if (vid < 0) { |
110 | dev_err(dev, "VID calculation failed.\n"); | |
674d0ed8 | 111 | return vid; |
9cb7d184 SW |
112 | } |
113 | ||
f24d548b GR |
114 | /* |
115 | * If output enabled, use control register value. | |
116 | * Otherwise original CPU VID | |
117 | */ | |
9cb7d184 SW |
118 | if (data->reg.vid & ATXP1_VIDENA) |
119 | cvid = data->reg.vid & ATXP1_VIDMASK; | |
120 | else | |
121 | cvid = data->reg.cpu_vid; | |
122 | ||
123 | /* Nothing changed, aborting */ | |
124 | if (vid == cvid) | |
125 | return count; | |
126 | ||
f24d548b | 127 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", (int)vcore, vid); |
9cb7d184 SW |
128 | |
129 | /* Write every 25 mV step to increase stability */ | |
130 | if (cvid > vid) { | |
f24d548b GR |
131 | for (; cvid >= vid; cvid--) |
132 | i2c_smbus_write_byte_data(client, | |
133 | ATXP1_VID, cvid | ATXP1_VIDENA); | |
134 | } else { | |
135 | for (; cvid <= vid; cvid++) | |
136 | i2c_smbus_write_byte_data(client, | |
137 | ATXP1_VID, cvid | ATXP1_VIDENA); | |
9cb7d184 SW |
138 | } |
139 | ||
952a11ca | 140 | data->valid = false; |
9cb7d184 SW |
141 | |
142 | return count; | |
143 | } | |
144 | ||
f24d548b GR |
145 | /* |
146 | * CPU core reference voltage | |
147 | * unit: millivolt | |
148 | */ | |
0acf2a5f | 149 | static DEVICE_ATTR_RW(cpu0_vid); |
9cb7d184 SW |
150 | |
151 | /* sys file functions for GPIO1 */ | |
0acf2a5f JL |
152 | static ssize_t gpio1_show(struct device *dev, struct device_attribute *attr, |
153 | char *buf) | |
9cb7d184 SW |
154 | { |
155 | int size; | |
156 | struct atxp1_data *data; | |
157 | ||
158 | data = atxp1_update_device(dev); | |
159 | ||
160 | size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK); | |
161 | ||
162 | return size; | |
163 | } | |
164 | ||
0acf2a5f JL |
165 | static ssize_t gpio1_store(struct device *dev, struct device_attribute *attr, |
166 | const char *buf, size_t count) | |
9cb7d184 | 167 | { |
11f7e494 AL |
168 | struct atxp1_data *data = atxp1_update_device(dev); |
169 | struct i2c_client *client = data->client; | |
f24d548b GR |
170 | unsigned long value; |
171 | int err; | |
9cb7d184 | 172 | |
f24d548b GR |
173 | err = kstrtoul(buf, 16, &value); |
174 | if (err) | |
175 | return err; | |
9cb7d184 SW |
176 | |
177 | value &= ATXP1_GPIO1MASK; | |
178 | ||
179 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
f24d548b | 180 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); |
9cb7d184 SW |
181 | |
182 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
183 | ||
952a11ca | 184 | data->valid = false; |
9cb7d184 SW |
185 | } |
186 | ||
187 | return count; | |
188 | } | |
189 | ||
f24d548b GR |
190 | /* |
191 | * GPIO1 data register | |
192 | * unit: Four bit as hex (e.g. 0x0f) | |
193 | */ | |
0acf2a5f | 194 | static DEVICE_ATTR_RW(gpio1); |
9cb7d184 SW |
195 | |
196 | /* sys file functions for GPIO2 */ | |
0acf2a5f JL |
197 | static ssize_t gpio2_show(struct device *dev, struct device_attribute *attr, |
198 | char *buf) | |
9cb7d184 SW |
199 | { |
200 | int size; | |
201 | struct atxp1_data *data; | |
202 | ||
203 | data = atxp1_update_device(dev); | |
204 | ||
205 | size = sprintf(buf, "0x%02x\n", data->reg.gpio2); | |
206 | ||
207 | return size; | |
208 | } | |
209 | ||
0acf2a5f JL |
210 | static ssize_t gpio2_store(struct device *dev, struct device_attribute *attr, |
211 | const char *buf, size_t count) | |
9cb7d184 | 212 | { |
f24d548b | 213 | struct atxp1_data *data = atxp1_update_device(dev); |
11f7e494 | 214 | struct i2c_client *client = data->client; |
f24d548b GR |
215 | unsigned long value; |
216 | int err; | |
9cb7d184 | 217 | |
f24d548b GR |
218 | err = kstrtoul(buf, 16, &value); |
219 | if (err) | |
220 | return err; | |
221 | value &= 0xff; | |
9cb7d184 SW |
222 | |
223 | if (value != data->reg.gpio2) { | |
f24d548b | 224 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); |
9cb7d184 SW |
225 | |
226 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
227 | ||
952a11ca | 228 | data->valid = false; |
9cb7d184 SW |
229 | } |
230 | ||
231 | return count; | |
232 | } | |
233 | ||
f24d548b GR |
234 | /* |
235 | * GPIO2 data register | |
236 | * unit: Eight bit as hex (e.g. 0xff) | |
237 | */ | |
0acf2a5f | 238 | static DEVICE_ATTR_RW(gpio2); |
9cb7d184 | 239 | |
11f7e494 | 240 | static struct attribute *atxp1_attrs[] = { |
a5ebe668 JD |
241 | &dev_attr_gpio1.attr, |
242 | &dev_attr_gpio2.attr, | |
243 | &dev_attr_cpu0_vid.attr, | |
244 | NULL | |
245 | }; | |
11f7e494 | 246 | ATTRIBUTE_GROUPS(atxp1); |
9cb7d184 | 247 | |
67487038 | 248 | static int atxp1_probe(struct i2c_client *client) |
71163c7c | 249 | { |
11f7e494 | 250 | struct device *dev = &client->dev; |
71163c7c | 251 | struct atxp1_data *data; |
11f7e494 | 252 | struct device *hwmon_dev; |
9cb7d184 | 253 | |
11f7e494 | 254 | data = devm_kzalloc(dev, sizeof(struct atxp1_data), GFP_KERNEL); |
d466a353 GR |
255 | if (!data) |
256 | return -ENOMEM; | |
9cb7d184 | 257 | |
71163c7c JD |
258 | /* Get VRM */ |
259 | data->vrm = vid_which_vrm(); | |
e892b75f GR |
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 | } | |
71163c7c | 265 | |
11f7e494 | 266 | data->client = client; |
71163c7c JD |
267 | mutex_init(&data->update_lock); |
268 | ||
11f7e494 AL |
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); | |
9cb7d184 | 274 | |
11f7e494 | 275 | dev_info(dev, "Using VRM: %d.%d\n", data->vrm / 10, data->vrm % 10); |
943b0830 | 276 | |
71163c7c | 277 | return 0; |
9cb7d184 SW |
278 | }; |
279 | ||
8dea1b4e AL |
280 | static const struct i2c_device_id atxp1_id[] = { |
281 | { "atxp1", 0 }, | |
282 | { } | |
283 | }; | |
284 | MODULE_DEVICE_TABLE(i2c, atxp1_id); | |
285 | ||
286 | static struct i2c_driver atxp1_driver = { | |
287 | .class = I2C_CLASS_HWMON, | |
288 | .driver = { | |
289 | .name = "atxp1", | |
290 | }, | |
67487038 | 291 | .probe_new = atxp1_probe, |
8dea1b4e | 292 | .id_table = atxp1_id, |
8dea1b4e AL |
293 | }; |
294 | ||
f0967eea | 295 | module_i2c_driver(atxp1_driver); |