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9cb7d184 SW |
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> | |
0cacdf29 | 24 | #include <linux/jiffies.h> |
9cb7d184 SW |
25 | #include <linux/i2c.h> |
26 | #include <linux/i2c-sensor.h> | |
27 | #include <linux/i2c-vid.h> | |
28 | ||
29 | MODULE_LICENSE("GPL"); | |
30 | MODULE_DESCRIPTION("System voltages control via Attansic ATXP1"); | |
31 | MODULE_VERSION("0.6.2"); | |
32 | MODULE_AUTHOR("Sebastian Witt <se.witt@gmx.net>"); | |
33 | ||
34 | #define ATXP1_VID 0x00 | |
35 | #define ATXP1_CVID 0x01 | |
36 | #define ATXP1_GPIO1 0x06 | |
37 | #define ATXP1_GPIO2 0x0a | |
38 | #define ATXP1_VIDENA 0x20 | |
39 | #define ATXP1_VIDMASK 0x1f | |
40 | #define ATXP1_GPIO1MASK 0x0f | |
41 | ||
42 | static unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END }; | |
43 | static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; | |
44 | ||
45 | SENSORS_INSMOD_1(atxp1); | |
46 | ||
47 | static int atxp1_attach_adapter(struct i2c_adapter * adapter); | |
48 | static int atxp1_detach_client(struct i2c_client * client); | |
49 | static struct atxp1_data * atxp1_update_device(struct device *dev); | |
50 | static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind); | |
51 | ||
52 | static struct i2c_driver atxp1_driver = { | |
53 | .owner = THIS_MODULE, | |
54 | .name = "atxp1", | |
55 | .flags = I2C_DF_NOTIFY, | |
56 | .attach_adapter = atxp1_attach_adapter, | |
57 | .detach_client = atxp1_detach_client, | |
58 | }; | |
59 | ||
60 | struct atxp1_data { | |
61 | struct i2c_client client; | |
62 | struct semaphore update_lock; | |
63 | unsigned long last_updated; | |
64 | u8 valid; | |
65 | struct { | |
66 | u8 vid; /* VID output register */ | |
67 | u8 cpu_vid; /* VID input from CPU */ | |
68 | u8 gpio1; /* General purpose I/O register 1 */ | |
69 | u8 gpio2; /* General purpose I/O register 2 */ | |
70 | } reg; | |
71 | u8 vrm; /* Detected CPU VRM */ | |
72 | }; | |
73 | ||
74 | static struct atxp1_data * atxp1_update_device(struct device *dev) | |
75 | { | |
76 | struct i2c_client *client; | |
77 | struct atxp1_data *data; | |
78 | ||
79 | client = to_i2c_client(dev); | |
80 | data = i2c_get_clientdata(client); | |
81 | ||
82 | down(&data->update_lock); | |
83 | ||
0cacdf29 | 84 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
9cb7d184 SW |
85 | |
86 | /* Update local register data */ | |
87 | data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID); | |
88 | data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID); | |
89 | data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1); | |
90 | data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2); | |
91 | ||
92 | data->valid = 1; | |
93 | } | |
94 | ||
95 | up(&data->update_lock); | |
96 | ||
97 | return(data); | |
98 | } | |
99 | ||
100 | /* sys file functions for cpu0_vid */ | |
6f637a64 | 101 | static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
102 | { |
103 | int size; | |
104 | struct atxp1_data *data; | |
105 | ||
106 | data = atxp1_update_device(dev); | |
107 | ||
108 | size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm)); | |
109 | ||
110 | return size; | |
111 | } | |
112 | ||
6f637a64 | 113 | static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
9cb7d184 SW |
114 | { |
115 | struct atxp1_data *data; | |
116 | struct i2c_client *client; | |
117 | char vid; | |
118 | char cvid; | |
119 | unsigned int vcore; | |
120 | ||
121 | client = to_i2c_client(dev); | |
122 | data = atxp1_update_device(dev); | |
123 | ||
124 | vcore = simple_strtoul(buf, NULL, 10); | |
125 | vcore /= 25; | |
126 | vcore *= 25; | |
127 | ||
128 | /* Calculate VID */ | |
129 | vid = vid_to_reg(vcore, data->vrm); | |
130 | ||
131 | if (vid < 0) { | |
132 | dev_err(dev, "VID calculation failed.\n"); | |
133 | return -1; | |
134 | } | |
135 | ||
136 | /* If output enabled, use control register value. Otherwise original CPU VID */ | |
137 | if (data->reg.vid & ATXP1_VIDENA) | |
138 | cvid = data->reg.vid & ATXP1_VIDMASK; | |
139 | else | |
140 | cvid = data->reg.cpu_vid; | |
141 | ||
142 | /* Nothing changed, aborting */ | |
143 | if (vid == cvid) | |
144 | return count; | |
145 | ||
164cad9b | 146 | dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid); |
9cb7d184 SW |
147 | |
148 | /* Write every 25 mV step to increase stability */ | |
149 | if (cvid > vid) { | |
150 | for (; cvid >= vid; cvid--) { | |
151 | i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA); | |
152 | } | |
153 | } | |
154 | else { | |
155 | for (; cvid <= vid; cvid++) { | |
156 | i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA); | |
157 | } | |
158 | } | |
159 | ||
160 | data->valid = 0; | |
161 | ||
162 | return count; | |
163 | } | |
164 | ||
165 | /* CPU core reference voltage | |
166 | unit: millivolt | |
167 | */ | |
168 | static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore); | |
169 | ||
170 | /* sys file functions for GPIO1 */ | |
6f637a64 | 171 | static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
172 | { |
173 | int size; | |
174 | struct atxp1_data *data; | |
175 | ||
176 | data = atxp1_update_device(dev); | |
177 | ||
178 | size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK); | |
179 | ||
180 | return size; | |
181 | } | |
182 | ||
6f637a64 | 183 | static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, const char*buf, size_t count) |
9cb7d184 SW |
184 | { |
185 | struct atxp1_data *data; | |
186 | struct i2c_client *client; | |
187 | unsigned int value; | |
188 | ||
189 | client = to_i2c_client(dev); | |
190 | data = atxp1_update_device(dev); | |
191 | ||
192 | value = simple_strtoul(buf, NULL, 16); | |
193 | ||
194 | value &= ATXP1_GPIO1MASK; | |
195 | ||
196 | if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) { | |
197 | dev_info(dev, "Writing 0x%x to GPIO1.\n", value); | |
198 | ||
199 | i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value); | |
200 | ||
201 | data->valid = 0; | |
202 | } | |
203 | ||
204 | return count; | |
205 | } | |
206 | ||
207 | /* GPIO1 data register | |
208 | unit: Four bit as hex (e.g. 0x0f) | |
209 | */ | |
210 | static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1); | |
211 | ||
212 | /* sys file functions for GPIO2 */ | |
6f637a64 | 213 | static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf) |
9cb7d184 SW |
214 | { |
215 | int size; | |
216 | struct atxp1_data *data; | |
217 | ||
218 | data = atxp1_update_device(dev); | |
219 | ||
220 | size = sprintf(buf, "0x%02x\n", data->reg.gpio2); | |
221 | ||
222 | return size; | |
223 | } | |
224 | ||
6f637a64 | 225 | static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
9cb7d184 SW |
226 | { |
227 | struct atxp1_data *data; | |
228 | struct i2c_client *client; | |
229 | unsigned int value; | |
230 | ||
231 | client = to_i2c_client(dev); | |
232 | data = atxp1_update_device(dev); | |
233 | ||
234 | value = simple_strtoul(buf, NULL, 16) & 0xff; | |
235 | ||
236 | if (value != data->reg.gpio2) { | |
237 | dev_info(dev, "Writing 0x%x to GPIO1.\n", value); | |
238 | ||
239 | i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value); | |
240 | ||
241 | data->valid = 0; | |
242 | } | |
243 | ||
244 | return count; | |
245 | } | |
246 | ||
247 | /* GPIO2 data register | |
248 | unit: Eight bit as hex (e.g. 0xff) | |
249 | */ | |
250 | static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2); | |
251 | ||
252 | ||
253 | static int atxp1_attach_adapter(struct i2c_adapter *adapter) | |
254 | { | |
255 | return i2c_detect(adapter, &addr_data, &atxp1_detect); | |
256 | }; | |
257 | ||
258 | static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind) | |
259 | { | |
260 | struct i2c_client * new_client; | |
261 | struct atxp1_data * data; | |
262 | int err = 0; | |
263 | u8 temp; | |
264 | ||
265 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
266 | goto exit; | |
267 | ||
268 | if (!(data = kmalloc(sizeof(struct atxp1_data), GFP_KERNEL))) { | |
269 | err = -ENOMEM; | |
270 | goto exit; | |
271 | } | |
272 | ||
273 | memset(data, 0, sizeof(struct atxp1_data)); | |
274 | new_client = &data->client; | |
275 | i2c_set_clientdata(new_client, data); | |
276 | ||
277 | new_client->addr = address; | |
278 | new_client->adapter = adapter; | |
279 | new_client->driver = &atxp1_driver; | |
280 | new_client->flags = 0; | |
281 | ||
282 | /* Detect ATXP1, checking if vendor ID registers are all zero */ | |
283 | if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) && | |
284 | (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) && | |
285 | (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) && | |
286 | (i2c_smbus_read_byte_data(new_client, 0xff) == 0) )) { | |
287 | ||
288 | /* No vendor ID, now checking if registers 0x10,0x11 (non-existent) | |
289 | * showing the same as register 0x00 */ | |
290 | temp = i2c_smbus_read_byte_data(new_client, 0x00); | |
291 | ||
292 | if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) && | |
293 | (i2c_smbus_read_byte_data(new_client, 0x11) == temp) )) | |
294 | goto exit_free; | |
295 | } | |
296 | ||
297 | /* Get VRM */ | |
298 | data->vrm = i2c_which_vrm(); | |
299 | ||
300 | if ((data->vrm != 90) && (data->vrm != 91)) { | |
301 | dev_err(&new_client->dev, "Not supporting VRM %d.%d\n", | |
302 | data->vrm / 10, data->vrm % 10); | |
303 | goto exit_free; | |
304 | } | |
305 | ||
306 | strncpy(new_client->name, "atxp1", I2C_NAME_SIZE); | |
307 | ||
308 | data->valid = 0; | |
309 | ||
310 | init_MUTEX(&data->update_lock); | |
311 | ||
312 | err = i2c_attach_client(new_client); | |
313 | ||
314 | if (err) | |
315 | { | |
316 | dev_err(&new_client->dev, "Attach client error.\n"); | |
317 | goto exit_free; | |
318 | } | |
319 | ||
320 | device_create_file(&new_client->dev, &dev_attr_gpio1); | |
321 | device_create_file(&new_client->dev, &dev_attr_gpio2); | |
322 | device_create_file(&new_client->dev, &dev_attr_cpu0_vid); | |
323 | ||
324 | dev_info(&new_client->dev, "Using VRM: %d.%d\n", | |
325 | data->vrm / 10, data->vrm % 10); | |
326 | ||
327 | return 0; | |
328 | ||
329 | exit_free: | |
330 | kfree(data); | |
331 | exit: | |
332 | return err; | |
333 | }; | |
334 | ||
335 | static int atxp1_detach_client(struct i2c_client * client) | |
336 | { | |
337 | int err; | |
338 | ||
339 | err = i2c_detach_client(client); | |
340 | ||
341 | if (err) | |
342 | dev_err(&client->dev, "Failed to detach client.\n"); | |
343 | else | |
344 | kfree(i2c_get_clientdata(client)); | |
345 | ||
346 | return err; | |
347 | }; | |
348 | ||
349 | static int __init atxp1_init(void) | |
350 | { | |
351 | return i2c_add_driver(&atxp1_driver); | |
352 | }; | |
353 | ||
354 | static void __exit atxp1_exit(void) | |
355 | { | |
356 | i2c_del_driver(&atxp1_driver); | |
357 | }; | |
358 | ||
359 | module_init(atxp1_init); | |
360 | module_exit(atxp1_exit); |