drivers/hwmon/atxp1.c

   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/jiffies.h>
  25 #include <linux/i2c.h>
  26 #include <linux/hwmon.h>
  27 #include <linux/hwmon-vid.h>
  28 #include <linux/err.h>
  29 #include <linux/mutex.h>
  30 #include <linux/sysfs.h>
  31
  32 MODULE_LICENSE("GPL");
  33 MODULE_DESCRIPTION("System voltages control via Attansic ATXP1");
  34 MODULE_VERSION("0.6.2");
  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 <<<<<<< HEAD:drivers/hwmon/atxp1.c
  46 static unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
  47 =======
  48 static const unsigned short normal_i2c[] = { 0x37, 0x4e, I2C_CLIENT_END };
  49 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/hwmon/atxp1.c
  50
  51 I2C_CLIENT_INSMOD_1(atxp1);
  52
  53 static int atxp1_attach_adapter(struct i2c_adapter * adapter);
  54 static int atxp1_detach_client(struct i2c_client * client);
  55 static struct atxp1_data * atxp1_update_device(struct device *dev);
  56 static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind);
  57
  58 static struct i2c_driver atxp1_driver = {
  59         .driver = {
  60                 .name   = "atxp1",
  61         },
  62         .attach_adapter = atxp1_attach_adapter,
  63         .detach_client  = atxp1_detach_client,
  64 };
  65
  66 struct atxp1_data {
  67         struct i2c_client client;
  68         struct device *hwmon_dev;
  69         struct mutex update_lock;
  70         unsigned long last_updated;
  71         u8 valid;
  72         struct {
  73                 u8 vid;         /* VID output register */
  74                 u8 cpu_vid; /* VID input from CPU */
  75                 u8 gpio1;   /* General purpose I/O register 1 */
  76                 u8 gpio2;   /* General purpose I/O register 2 */
  77         } reg;
  78         u8 vrm;                 /* Detected CPU VRM */
  79 };
  80
  81 static struct atxp1_data * atxp1_update_device(struct device *dev)
  82 {
  83         struct i2c_client *client;
  84         struct atxp1_data *data;
  85
  86         client = to_i2c_client(dev);
  87         data = i2c_get_clientdata(client);
  88
  89         mutex_lock(&data->update_lock);
  90
  91         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
  92
  93                 /* Update local register data */
  94                 data->reg.vid = i2c_smbus_read_byte_data(client, ATXP1_VID);
  95                 data->reg.cpu_vid = i2c_smbus_read_byte_data(client, ATXP1_CVID);
  96                 data->reg.gpio1 = i2c_smbus_read_byte_data(client, ATXP1_GPIO1);
  97                 data->reg.gpio2 = i2c_smbus_read_byte_data(client, ATXP1_GPIO2);
  98
  99                 data->valid = 1;
 100         }
 101
 102         mutex_unlock(&data->update_lock);
 103
 104         return(data);
 105 }
 106
 107 /* sys file functions for cpu0_vid */
 108 static ssize_t atxp1_showvcore(struct device *dev, struct device_attribute *attr, char *buf)
 109 {
 110         int size;
 111         struct atxp1_data *data;
 112
 113         data = atxp1_update_device(dev);
 114
 115         size = sprintf(buf, "%d\n", vid_from_reg(data->reg.vid & ATXP1_VIDMASK, data->vrm));
 116
 117         return size;
 118 }
 119
 120 static ssize_t atxp1_storevcore(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 121 {
 122         struct atxp1_data *data;
 123         struct i2c_client *client;
 124         int vid, cvid;
 125         unsigned int vcore;
 126
 127         client = to_i2c_client(dev);
 128         data = atxp1_update_device(dev);
 129
 130         vcore = simple_strtoul(buf, NULL, 10);
 131         vcore /= 25;
 132         vcore *= 25;
 133
 134         /* Calculate VID */
 135         vid = vid_to_reg(vcore, data->vrm);
 136
 137         if (vid < 0) {
 138                 dev_err(dev, "VID calculation failed.\n");
 139                 return -1;
 140         }
 141
 142         /* If output enabled, use control register value. Otherwise original CPU VID */
 143         if (data->reg.vid & ATXP1_VIDENA)
 144                 cvid = data->reg.vid & ATXP1_VIDMASK;
 145         else
 146                 cvid = data->reg.cpu_vid;
 147
 148         /* Nothing changed, aborting */
 149         if (vid == cvid)
 150                 return count;
 151
 152         dev_dbg(dev, "Setting VCore to %d mV (0x%02x)\n", vcore, vid);
 153
 154         /* Write every 25 mV step to increase stability */
 155         if (cvid > vid) {
 156                 for (; cvid >= vid; cvid--) {
 157                         i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
 158                 }
 159         }
 160         else {
 161                 for (; cvid <= vid; cvid++) {
 162                         i2c_smbus_write_byte_data(client, ATXP1_VID, cvid | ATXP1_VIDENA);
 163                 }
 164         }
 165
 166         data->valid = 0;
 167
 168         return count;
 169 }
 170
 171 /* CPU core reference voltage
 172     unit: millivolt
 173 */
 174 static DEVICE_ATTR(cpu0_vid, S_IRUGO | S_IWUSR, atxp1_showvcore, atxp1_storevcore);
 175
 176 /* sys file functions for GPIO1 */
 177 static ssize_t atxp1_showgpio1(struct device *dev, struct device_attribute *attr, char *buf)
 178 {
 179         int size;
 180         struct atxp1_data *data;
 181
 182         data = atxp1_update_device(dev);
 183
 184         size = sprintf(buf, "0x%02x\n", data->reg.gpio1 & ATXP1_GPIO1MASK);
 185
 186         return size;
 187 }
 188
 189 static ssize_t atxp1_storegpio1(struct device *dev, struct device_attribute *attr, const char*buf, size_t count)
 190 {
 191         struct atxp1_data *data;
 192         struct i2c_client *client;
 193         unsigned int value;
 194
 195         client = to_i2c_client(dev);
 196         data = atxp1_update_device(dev);
 197
 198         value = simple_strtoul(buf, NULL, 16);
 199
 200         value &= ATXP1_GPIO1MASK;
 201
 202         if (value != (data->reg.gpio1 & ATXP1_GPIO1MASK)) {
 203                 dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
 204
 205                 i2c_smbus_write_byte_data(client, ATXP1_GPIO1, value);
 206
 207                 data->valid = 0;
 208         }
 209
 210         return count;
 211 }
 212
 213 /* GPIO1 data register
 214     unit: Four bit as hex (e.g. 0x0f)
 215 */
 216 static DEVICE_ATTR(gpio1, S_IRUGO | S_IWUSR, atxp1_showgpio1, atxp1_storegpio1);
 217
 218 /* sys file functions for GPIO2 */
 219 static ssize_t atxp1_showgpio2(struct device *dev, struct device_attribute *attr, char *buf)
 220 {
 221         int size;
 222         struct atxp1_data *data;
 223
 224         data = atxp1_update_device(dev);
 225
 226         size = sprintf(buf, "0x%02x\n", data->reg.gpio2);
 227
 228         return size;
 229 }
 230
 231 static ssize_t atxp1_storegpio2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 232 {
 233         struct atxp1_data *data;
 234         struct i2c_client *client;
 235         unsigned int value;
 236
 237         client = to_i2c_client(dev);
 238         data = atxp1_update_device(dev);
 239
 240         value = simple_strtoul(buf, NULL, 16) & 0xff;
 241
 242         if (value != data->reg.gpio2) {
 243                 dev_info(dev, "Writing 0x%x to GPIO1.\n", value);
 244
 245                 i2c_smbus_write_byte_data(client, ATXP1_GPIO2, value);
 246
 247                 data->valid = 0;
 248         }
 249
 250         return count;
 251 }
 252
 253 /* GPIO2 data register
 254     unit: Eight bit as hex (e.g. 0xff)
 255 */
 256 static DEVICE_ATTR(gpio2, S_IRUGO | S_IWUSR, atxp1_showgpio2, atxp1_storegpio2);
 257
 258 static struct attribute *atxp1_attributes[] = {
 259         &dev_attr_gpio1.attr,
 260         &dev_attr_gpio2.attr,
 261         &dev_attr_cpu0_vid.attr,
 262         NULL
 263 };
 264
 265 static const struct attribute_group atxp1_group = {
 266         .attrs = atxp1_attributes,
 267 };
 268
 269
 270 static int atxp1_attach_adapter(struct i2c_adapter *adapter)
 271 {
 272         if (!(adapter->class & I2C_CLASS_HWMON))
 273                 return 0;
 274         return i2c_probe(adapter, &addr_data, &atxp1_detect);
 275 };
 276
 277 static int atxp1_detect(struct i2c_adapter *adapter, int address, int kind)
 278 {
 279         struct i2c_client * new_client;
 280         struct atxp1_data * data;
 281         int err = 0;
 282         u8 temp;
 283
 284         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 285                 goto exit;
 286
 287         if (!(data = kzalloc(sizeof(struct atxp1_data), GFP_KERNEL))) {
 288                 err = -ENOMEM;
 289                 goto exit;
 290         }
 291
 292         new_client = &data->client;
 293         i2c_set_clientdata(new_client, data);
 294
 295         new_client->addr = address;
 296         new_client->adapter = adapter;
 297         new_client->driver = &atxp1_driver;
 298         new_client->flags = 0;
 299
 300         /* Detect ATXP1, checking if vendor ID registers are all zero */
 301         if (!((i2c_smbus_read_byte_data(new_client, 0x3e) == 0) &&
 302              (i2c_smbus_read_byte_data(new_client, 0x3f) == 0) &&
 303              (i2c_smbus_read_byte_data(new_client, 0xfe) == 0) &&
 304              (i2c_smbus_read_byte_data(new_client, 0xff) == 0) )) {
 305
 306                 /* No vendor ID, now checking if registers 0x10,0x11 (non-existent)
 307                  * showing the same as register 0x00 */
 308                 temp = i2c_smbus_read_byte_data(new_client, 0x00);
 309
 310                 if (!((i2c_smbus_read_byte_data(new_client, 0x10) == temp) &&
 311                          (i2c_smbus_read_byte_data(new_client, 0x11) == temp) ))
 312                         goto exit_free;
 313         }
 314
 315         /* Get VRM */
 316         data->vrm = vid_which_vrm();
 317
 318         if ((data->vrm != 90) && (data->vrm != 91)) {
 319                 dev_err(&new_client->dev, "Not supporting VRM %d.%d\n",
 320                                 data->vrm / 10, data->vrm % 10);
 321                 goto exit_free;
 322         }
 323
 324         strncpy(new_client->name, "atxp1", I2C_NAME_SIZE);
 325
 326         data->valid = 0;
 327
 328         mutex_init(&data->update_lock);
 329
 330         err = i2c_attach_client(new_client);
 331
 332         if (err)
 333         {
 334                 dev_err(&new_client->dev, "Attach client error.\n");
 335                 goto exit_free;
 336         }
 337
 338         /* Register sysfs hooks */
 339         if ((err = sysfs_create_group(&new_client->dev.kobj, &atxp1_group)))
 340                 goto exit_detach;
 341
 342         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 343         if (IS_ERR(data->hwmon_dev)) {
 344                 err = PTR_ERR(data->hwmon_dev);
 345                 goto exit_remove_files;
 346         }
 347
 348         dev_info(&new_client->dev, "Using VRM: %d.%d\n",
 349                          data->vrm / 10, data->vrm % 10);
 350
 351         return 0;
 352
 353 exit_remove_files:
 354         sysfs_remove_group(&new_client->dev.kobj, &atxp1_group);
 355 exit_detach:
 356         i2c_detach_client(new_client);
 357 exit_free:
 358         kfree(data);
 359 exit:
 360         return err;
 361 };
 362
 363 static int atxp1_detach_client(struct i2c_client * client)
 364 {
 365         struct atxp1_data * data = i2c_get_clientdata(client);
 366         int err;
 367
 368         hwmon_device_unregister(data->hwmon_dev);
 369         sysfs_remove_group(&client->dev.kobj, &atxp1_group);
 370
 371         err = i2c_detach_client(client);
 372
 373         if (err)
 374                 dev_err(&client->dev, "Failed to detach client.\n");
 375         else
 376                 kfree(data);
 377
 378         return err;
 379 };
 380
 381 static int __init atxp1_init(void)
 382 {
 383         return i2c_add_driver(&atxp1_driver);
 384 };
 385
 386 static void __exit atxp1_exit(void)
 387 {
 388         i2c_del_driver(&atxp1_driver);
 389 };
 390
 391 module_init(atxp1_init);
 392 module_exit(atxp1_exit);