drivers/hwmon/smsc47b397.c

   1 /*
   2     smsc47b397.c - Part of lm_sensors, Linux kernel modules
   3                         for hardware monitoring
   4
   5     Supports the SMSC LPC47B397-NC Super-I/O chip.
   6
   7     Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
   8         Copyright (C) 2004 Utilitek Systems, Inc.
   9
  10     derived in part from smsc47m1.c:
  11         Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
  12         Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
  13
  14     This program is free software; you can redistribute it and/or modify
  15     it under the terms of the GNU General Public License as published by
  16     the Free Software Foundation; either version 2 of the License, or
  17     (at your option) any later version.
  18
  19     This program is distributed in the hope that it will be useful,
  20     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22     GNU General Public License for more details.
  23
  24     You should have received a copy of the GNU General Public License
  25     along with this program; if not, write to the Free Software
  26     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27 */
  28
  29 #include <linux/module.h>
  30 #include <linux/slab.h>
  31 #include <linux/ioport.h>
  32 #include <linux/jiffies.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/hwmon.h>
  35 #include <linux/hwmon-sysfs.h>
  36 #include <linux/err.h>
  37 #include <linux/init.h>
  38 #include <linux/mutex.h>
  39 #include <linux/acpi.h>
  40 #include <asm/io.h>
  41
  42 static unsigned short force_id;
  43 module_param(force_id, ushort, 0);
  44 MODULE_PARM_DESC(force_id, "Override the detected device ID");
  45
  46 static struct platform_device *pdev;
  47
  48 #define DRVNAME "smsc47b397"
  49
  50 /* Super-I/0 registers and commands */
  51
  52 #define REG     0x2e    /* The register to read/write */
  53 #define VAL     0x2f    /* The value to read/write */
  54
  55 static inline void superio_outb(int reg, int val)
  56 {
  57         outb(reg, REG);
  58         outb(val, VAL);
  59 }
  60
  61 static inline int superio_inb(int reg)
  62 {
  63         outb(reg, REG);
  64         return inb(VAL);
  65 }
  66
  67 /* select superio logical device */
  68 static inline void superio_select(int ld)
  69 {
  70         superio_outb(0x07, ld);
  71 }
  72
  73 static inline void superio_enter(void)
  74 {
  75         outb(0x55, REG);
  76 }
  77
  78 static inline void superio_exit(void)
  79 {
  80         outb(0xAA, REG);
  81 }
  82
  83 #define SUPERIO_REG_DEVID       0x20
  84 #define SUPERIO_REG_DEVREV      0x21
  85 #define SUPERIO_REG_BASE_MSB    0x60
  86 #define SUPERIO_REG_BASE_LSB    0x61
  87 #define SUPERIO_REG_LD8         0x08
  88
  89 #define SMSC_EXTENT             0x02
  90
  91 /* 0 <= nr <= 3 */
  92 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
  93 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
  94
  95 /* 0 <= nr <= 3 */
  96 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
  97 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
  98
  99 struct smsc47b397_data {
 100         unsigned short addr;
 101         const char *name;
 102         struct device *hwmon_dev;
 103         struct mutex lock;
 104
 105         struct mutex update_lock;
 106         unsigned long last_updated; /* in jiffies */
 107         int valid;
 108
 109         /* register values */
 110         u16 fan[4];
 111         u8 temp[4];
 112 };
 113
 114 static int smsc47b397_read_value(struct smsc47b397_data* data, u8 reg)
 115 {
 116         int res;
 117
 118         mutex_lock(&data->lock);
 119         outb(reg, data->addr);
 120         res = inb_p(data->addr + 1);
 121         mutex_unlock(&data->lock);
 122         return res;
 123 }
 124
 125 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
 126 {
 127         struct smsc47b397_data *data = dev_get_drvdata(dev);
 128         int i;
 129
 130         mutex_lock(&data->update_lock);
 131
 132         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 133                 dev_dbg(dev, "starting device update...\n");
 134
 135                 /* 4 temperature inputs, 4 fan inputs */
 136                 for (i = 0; i < 4; i++) {
 137                         data->temp[i] = smsc47b397_read_value(data,
 138                                         SMSC47B397_REG_TEMP(i));
 139
 140                         /* must read LSB first */
 141                         data->fan[i]  = smsc47b397_read_value(data,
 142                                         SMSC47B397_REG_FAN_LSB(i));
 143                         data->fan[i] |= smsc47b397_read_value(data,
 144                                         SMSC47B397_REG_FAN_MSB(i)) << 8;
 145                 }
 146
 147                 data->last_updated = jiffies;
 148                 data->valid = 1;
 149
 150                 dev_dbg(dev, "... device update complete\n");
 151         }
 152
 153         mutex_unlock(&data->update_lock);
 154
 155         return data;
 156 }
 157
 158 /* TEMP: 0.001C/bit (-128C to +127C)
 159    REG: 1C/bit, two's complement */
 160 static int temp_from_reg(u8 reg)
 161 {
 162         return (s8)reg * 1000;
 163 }
 164
 165 static ssize_t show_temp(struct device *dev, struct device_attribute
 166                          *devattr, char *buf)
 167 {
 168         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 169         struct smsc47b397_data *data = smsc47b397_update_device(dev);
 170         return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
 171 }
 172
 173 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 174 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 175 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 176 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
 177
 178 /* FAN: 1 RPM/bit
 179    REG: count of 90kHz pulses / revolution */
 180 static int fan_from_reg(u16 reg)
 181 {
 182         if (reg == 0 || reg == 0xffff)
 183                 return 0;
 184         return 90000 * 60 / reg;
 185 }
 186
 187 static ssize_t show_fan(struct device *dev, struct device_attribute
 188                         *devattr, char *buf)
 189 {
 190         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 191         struct smsc47b397_data *data = smsc47b397_update_device(dev);
 192         return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
 193 }
 194 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
 195 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
 196 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
 197 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
 198
 199 static ssize_t show_name(struct device *dev, struct device_attribute
 200                          *devattr, char *buf)
 201 {
 202         struct smsc47b397_data *data = dev_get_drvdata(dev);
 203         return sprintf(buf, "%s\n", data->name);
 204 }
 205 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 206
 207 static struct attribute *smsc47b397_attributes[] = {
 208         &sensor_dev_attr_temp1_input.dev_attr.attr,
 209         &sensor_dev_attr_temp2_input.dev_attr.attr,
 210         &sensor_dev_attr_temp3_input.dev_attr.attr,
 211         &sensor_dev_attr_temp4_input.dev_attr.attr,
 212         &sensor_dev_attr_fan1_input.dev_attr.attr,
 213         &sensor_dev_attr_fan2_input.dev_attr.attr,
 214         &sensor_dev_attr_fan3_input.dev_attr.attr,
 215         &sensor_dev_attr_fan4_input.dev_attr.attr,
 216
 217         &dev_attr_name.attr,
 218         NULL
 219 };
 220
 221 static const struct attribute_group smsc47b397_group = {
 222         .attrs = smsc47b397_attributes,
 223 };
 224
 225 static int __devexit smsc47b397_remove(struct platform_device *pdev)
 226 {
 227         struct smsc47b397_data *data = platform_get_drvdata(pdev);
 228         struct resource *res;
 229
 230         hwmon_device_unregister(data->hwmon_dev);
 231         sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group);
 232         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 233         release_region(res->start, SMSC_EXTENT);
 234         kfree(data);
 235
 236         return 0;
 237 }
 238
 239 static int smsc47b397_probe(struct platform_device *pdev);
 240
 241 static struct platform_driver smsc47b397_driver = {
 242         .driver = {
 243                 .owner  = THIS_MODULE,
 244                 .name   = DRVNAME,
 245         },
 246         .probe          = smsc47b397_probe,
 247         .remove         = __devexit_p(smsc47b397_remove),
 248 };
 249
 250 static int __devinit smsc47b397_probe(struct platform_device *pdev)
 251 {
 252         struct device *dev = &pdev->dev;
 253         struct smsc47b397_data *data;
 254         struct resource *res;
 255         int err = 0;
 256
 257         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 258         if (!request_region(res->start, SMSC_EXTENT,
 259                             smsc47b397_driver.driver.name)) {
 260                 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
 261                         (unsigned long)res->start,
 262                         (unsigned long)res->start + SMSC_EXTENT - 1);
 263                 return -EBUSY;
 264         }
 265
 266         if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
 267                 err = -ENOMEM;
 268                 goto error_release;
 269         }
 270
 271         data->addr = res->start;
 272         data->name = "smsc47b397";
 273         mutex_init(&data->lock);
 274         mutex_init(&data->update_lock);
 275         platform_set_drvdata(pdev, data);
 276
 277         if ((err = sysfs_create_group(&dev->kobj, &smsc47b397_group)))
 278                 goto error_free;
 279
 280         data->hwmon_dev = hwmon_device_register(dev);
 281         if (IS_ERR(data->hwmon_dev)) {
 282                 err = PTR_ERR(data->hwmon_dev);
 283                 goto error_remove;
 284         }
 285
 286         return 0;
 287
 288 error_remove:
 289         sysfs_remove_group(&dev->kobj, &smsc47b397_group);
 290 error_free:
 291         kfree(data);
 292 error_release:
 293         release_region(res->start, SMSC_EXTENT);
 294         return err;
 295 }
 296
 297 static int __init smsc47b397_device_add(unsigned short address)
 298 {
 299         struct resource res = {
 300                 .start  = address,
 301                 .end    = address + SMSC_EXTENT - 1,
 302                 .name   = DRVNAME,
 303                 .flags  = IORESOURCE_IO,
 304         };
 305         int err;
 306
 307         err = acpi_check_resource_conflict(&res);
 308         if (err)
 309                 goto exit;
 310
 311         pdev = platform_device_alloc(DRVNAME, address);
 312         if (!pdev) {
 313                 err = -ENOMEM;
 314                 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
 315                 goto exit;
 316         }
 317
 318         err = platform_device_add_resources(pdev, &res, 1);
 319         if (err) {
 320                 printk(KERN_ERR DRVNAME ": Device resource addition failed "
 321                        "(%d)\n", err);
 322                 goto exit_device_put;
 323         }
 324
 325         err = platform_device_add(pdev);
 326         if (err) {
 327                 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
 328                        err);
 329                 goto exit_device_put;
 330         }
 331
 332         return 0;
 333
 334 exit_device_put:
 335         platform_device_put(pdev);
 336 exit:
 337         return err;
 338 }
 339
 340 static int __init smsc47b397_find(unsigned short *addr)
 341 {
 342         u8 id, rev;
 343         char *name;
 344
 345         superio_enter();
 346         id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
 347
 348         switch(id) {
 349         case 0x81:
 350                 name = "SCH5307-NS";
 351                 break;
 352         case 0x6f:
 353                 name = "LPC47B397-NC";
 354                 break;
 355         case 0x85:
 356         case 0x8c:
 357                 name = "SCH5317";
 358                 break;
 359         default:
 360                 superio_exit();
 361                 return -ENODEV;
 362         }
 363
 364         rev = superio_inb(SUPERIO_REG_DEVREV);
 365
 366         superio_select(SUPERIO_REG_LD8);
 367         *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
 368                  |  superio_inb(SUPERIO_REG_BASE_LSB);
 369
 370         printk(KERN_INFO DRVNAME ": found SMSC %s "
 371                 "(base address 0x%04x, revision %u)\n",
 372                 name, *addr, rev);
 373
 374         superio_exit();
 375         return 0;
 376 }
 377
 378 static int __init smsc47b397_init(void)
 379 {
 380         unsigned short address;
 381         int ret;
 382
 383         if ((ret = smsc47b397_find(&address)))
 384                 return ret;
 385
 386         ret = platform_driver_register(&smsc47b397_driver);
 387         if (ret)
 388                 goto exit;
 389
 390         /* Sets global pdev as a side effect */
 391         ret = smsc47b397_device_add(address);
 392         if (ret)
 393                 goto exit_driver;
 394
 395         return 0;
 396
 397 exit_driver:
 398         platform_driver_unregister(&smsc47b397_driver);
 399 exit:
 400         return ret;
 401 }
 402
 403 static void __exit smsc47b397_exit(void)
 404 {
 405         platform_device_unregister(pdev);
 406         platform_driver_unregister(&smsc47b397_driver);
 407 }
 408
 409 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 410 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
 411 MODULE_LICENSE("GPL");
 412
 413 module_init(smsc47b397_init);
 414 module_exit(smsc47b397_exit);