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