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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> |
9a61bf63 | 19 | #include <linux/mutex.h> |
a5ebe668 | 20 | #include <linux/sysfs.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
9cb7d184 SW |
22 | |
23 | MODULE_LICENSE("GPL"); | |
24 | MODULE_DESCRIPTION("System voltages control via Attansic ATXP1"); | |
13b3c3fa | 25 | MODULE_VERSION("0.6.3"); |
9cb7d184 SW |
26 | MODULE_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 | ||
9cb7d184 | 36 | struct atxp1_data { |
11f7e494 | 37 | struct i2c_client *client; |
9a61bf63 | 38 | struct mutex update_lock; |
9cb7d184 SW |
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 | ||
f24d548b | 50 | static struct atxp1_data *atxp1_update_device(struct device *dev) |
9cb7d184 | 51 | { |
11f7e494 AL |
52 | struct atxp1_data *data = dev_get_drvdata(dev); |
53 | struct i2c_client *client = data->client; | |
9cb7d184 | 54 | |
9a61bf63 | 55 | mutex_lock(&data->update_lock); |
9cb7d184 | 56 | |
0cacdf29 | 57 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
9cb7d184 SW |
58 | |
59 | /* Update local register data */ | |
60 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
f24d548b GR |
61 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, |
62 | ATXP1_CVID); | |
9cb7d184 SW |
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 | ||
9a61bf63 | 69 | mutex_unlock(&data->update_lock); |
9cb7d184 | 70 | |
7fe83ad8 | 71 | return data; |
9cb7d184 SW |
72 | } |
73 | ||
74 | /* sys file functions for cpu0_vid */ | |
0acf2a5f JL |
75 | static ssize_t cpu0_vid_show(struct device *dev, |
76 | struct device_attribute *attr, char *buf) | |
9cb7d184 SW |
77 | { |
78 | int size; | |
79 | struct atxp1_data *data; | |
80 | ||
81 | data = atxp1_update_device(dev); | |
82 | ||
f24d548b GR |
83 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, |
84 | data->vrm)); | |
9cb7d184 SW |
85 | |
86 | return size; | |
87 | } | |
88 | ||
0acf2a5f JL |
89 | static ssize_t cpu0_vid_store(struct device *dev, |
90 | struct device_attribute *attr, const char *buf, | |
91 | size_t count) | |
9cb7d184 | 92 | { |
11f7e494 AL |
93 | struct atxp1_data *data = atxp1_update_device(dev); |
94 | struct i2c_client *client = data->client; | |
c41bdb52 | 95 | int vid, cvid; |
f24d548b GR |
96 | unsigned long vcore; |
97 | int err; | |
9cb7d184 | 98 | |
f24d548b GR |
99 | err = kstrtoul(buf, 10, &vcore); |
100 | if (err) | |
101 | return err; | |
102 | ||
9cb7d184 SW |
103 | vcore /= 25; |
104 | vcore *= 25; | |
105 | ||
106 | /* Calculate VID */ | |
107 | vid = vid_to_reg(vcore, data->vrm); | |
9cb7d184 SW |
108 | if (vid < 0) { |
109 | dev_err(dev, "VID calculation failed.\n"); | |
674d0ed8 | 110 | return vid; |
9cb7d184 SW |
111 | } |
112 | ||
f24d548b GR |
113 | /* |
114 | * If output enabled, use control register value. | |
115 | * Otherwise original CPU VID | |
116 | */ | |
9cb7d184 SW |
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 | ||
f24d548b | 126 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", (int)vcore, vid); |
9cb7d184 SW |
127 | |
128 | /* Write every 25 mV step to increase stability */ | |
129 | if (cvid > vid) { | |
f24d548b GR |
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); | |
9cb7d184 SW |
137 | } |
138 | ||
139 | data->valid = 0; | |
140 | ||
141 | return count; | |
142 | } | |
143 | ||
f24d548b GR |
144 | /* |
145 | * CPU core reference voltage | |
146 | * unit: millivolt | |
147 | */ | |
0acf2a5f | 148 | static DEVICE_ATTR_RW(cpu0_vid); |
9cb7d184 SW |
149 | |
150 | /* sys file functions for GPIO1 */ | |
0acf2a5f JL |
151 | static ssize_t gpio1_show(struct device *dev, struct device_attribute *attr, |
152 | char *buf) | |
9cb7d184 SW |
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 | ||
0acf2a5f JL |
164 | static ssize_t gpio1_store(struct device *dev, struct device_attribute *attr, |
165 | const char *buf, size_t count) | |
9cb7d184 | 166 | { |
11f7e494 AL |
167 | struct atxp1_data *data = atxp1_update_device(dev); |
168 | struct i2c_client *client = data->client; | |
f24d548b GR |
169 | unsigned long value; |
170 | int err; | |
9cb7d184 | 171 | |
f24d548b GR |
172 | err = kstrtoul(buf, 16, &value); |
173 | if (err) | |
174 | return err; | |
9cb7d184 SW |
175 | |
176 | value &= ATXP1_GPIO1MASK; | |
177 | ||
178 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
f24d548b | 179 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); |
9cb7d184 SW |
180 | |
181 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
182 | ||
183 | data->valid = 0; | |
184 | } | |
185 | ||
186 | return count; | |
187 | } | |
188 | ||
f24d548b GR |
189 | /* |
190 | * GPIO1 data register | |
191 | * unit: Four bit as hex (e.g. 0x0f) | |
192 | */ | |
0acf2a5f | 193 | static DEVICE_ATTR_RW(gpio1); |
9cb7d184 SW |
194 | |
195 | /* sys file functions for GPIO2 */ | |
0acf2a5f JL |
196 | static ssize_t gpio2_show(struct device *dev, struct device_attribute *attr, |
197 | char *buf) | |
9cb7d184 SW |
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 | ||
0acf2a5f JL |
209 | static ssize_t gpio2_store(struct device *dev, struct device_attribute *attr, |
210 | const char *buf, size_t count) | |
9cb7d184 | 211 | { |
f24d548b | 212 | struct atxp1_data *data = atxp1_update_device(dev); |
11f7e494 | 213 | struct i2c_client *client = data->client; |
f24d548b GR |
214 | unsigned long value; |
215 | int err; | |
9cb7d184 | 216 | |
f24d548b GR |
217 | err = kstrtoul(buf, 16, &value); |
218 | if (err) | |
219 | return err; | |
220 | value &= 0xff; | |
9cb7d184 SW |
221 | |
222 | if (value != data->reg.gpio2) { | |
f24d548b | 223 | dev_info(dev, "Writing 0x%x to GPIO1.\n", (unsigned int)value); |
9cb7d184 SW |
224 | |
225 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
226 | ||
227 | data->valid = 0; | |
228 | } | |
229 | ||
230 | return count; | |
231 | } | |
232 | ||
f24d548b GR |
233 | /* |
234 | * GPIO2 data register | |
235 | * unit: Eight bit as hex (e.g. 0xff) | |
236 | */ | |
0acf2a5f | 237 | static DEVICE_ATTR_RW(gpio2); |
9cb7d184 | 238 | |
11f7e494 | 239 | static struct attribute *atxp1_attrs[] = { |
a5ebe668 JD |
240 | &dev_attr_gpio1.attr, |
241 | &dev_attr_gpio2.attr, | |
242 | &dev_attr_cpu0_vid.attr, | |
243 | NULL | |
244 | }; | |
11f7e494 | 245 | ATTRIBUTE_GROUPS(atxp1); |
9cb7d184 | 246 | |
67487038 | 247 | static int atxp1_probe(struct i2c_client *client) |
71163c7c | 248 | { |
11f7e494 | 249 | struct device *dev = &client->dev; |
71163c7c | 250 | struct atxp1_data *data; |
11f7e494 | 251 | struct device *hwmon_dev; |
9cb7d184 | 252 | |
11f7e494 | 253 | data = devm_kzalloc(dev, sizeof(struct atxp1_data), GFP_KERNEL); |
d466a353 GR |
254 | if (!data) |
255 | return -ENOMEM; | |
9cb7d184 | 256 | |
71163c7c JD |
257 | /* Get VRM */ |
258 | data->vrm = vid_which_vrm(); | |
e892b75f GR |
259 | if (data->vrm != 90 && data->vrm != 91) { |
260 | dev_err(dev, "atxp1: Not supporting VRM %d.%d\n", | |
261 | data->vrm / 10, data->vrm % 10); | |
262 | return -ENODEV; | |
263 | } | |
71163c7c | 264 | |
11f7e494 | 265 | data->client = client; |
71163c7c JD |
266 | mutex_init(&data->update_lock); |
267 | ||
11f7e494 AL |
268 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
269 | data, | |
270 | atxp1_groups); | |
271 | if (IS_ERR(hwmon_dev)) | |
272 | return PTR_ERR(hwmon_dev); | |
9cb7d184 | 273 | |
11f7e494 | 274 | dev_info(dev, "Using VRM: %d.%d\n", data->vrm / 10, data->vrm % 10); |
943b0830 | 275 | |
71163c7c | 276 | return 0; |
9cb7d184 SW |
277 | }; |
278 | ||
8dea1b4e AL |
279 | static const struct i2c_device_id atxp1_id[] = { |
280 | { "atxp1", 0 }, | |
281 | { } | |
282 | }; | |
283 | MODULE_DEVICE_TABLE(i2c, atxp1_id); | |
284 | ||
285 | static struct i2c_driver atxp1_driver = { | |
286 | .class = I2C_CLASS_HWMON, | |
287 | .driver = { | |
288 | .name = "atxp1", | |
289 | }, | |
67487038 | 290 | .probe_new = atxp1_probe, |
8dea1b4e | 291 | .id_table = atxp1_id, |
8dea1b4e AL |
292 | }; |
293 | ||
f0967eea | 294 | module_i2c_driver(atxp1_driver); |