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 <asm/io.h>
  40
  41 static struct platform_device *pdev;
  42
  43 #define DRVNAME "smsc47b397"
  44
  45 /* Super-I/0 registers and commands */
  46
  47 #define REG     0x2e    /* The register to read/write */
  48 #define VAL     0x2f    /* The value to read/write */
  49
  50 static inline void superio_outb(int reg, int val)
  51 {
  52         outb(reg, REG);
  53         outb(val, VAL);
  54 }
  55
  56 static inline int superio_inb(int reg)
  57 {
  58         outb(reg, REG);
  59         return inb(VAL);
  60 }
  61
  62 /* select superio logical device */
  63 static inline void superio_select(int ld)
  64 {
  65         superio_outb(0x07, ld);
  66 }
  67
  68 static inline void superio_enter(void)
  69 {
  70         outb(0x55, REG);
  71 }
  72
  73 static inline void superio_exit(void)
  74 {
  75         outb(0xAA, REG);
  76 }
  77
  78 #define SUPERIO_REG_DEVID       0x20
  79 #define SUPERIO_REG_DEVREV      0x21
  80 #define SUPERIO_REG_BASE_MSB    0x60
  81 #define SUPERIO_REG_BASE_LSB    0x61
  82 #define SUPERIO_REG_LD8         0x08
  83
  84 #define SMSC_EXTENT             0x02
  85
  86 /* 0 <= nr <= 3 */
  87 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
  88 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
  89
  90 /* 0 <= nr <= 3 */
  91 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
  92 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
  93
  94 struct smsc47b397_data {
  95         unsigned short addr;
  96         const char *name;
  97         struct class_device *class_dev;
  98         struct mutex lock;
  99
 100         struct mutex update_lock;
 101         unsigned long last_updated; /* in jiffies */
 102         int valid;
 103
 104         /* register values */
 105         u16 fan[4];
 106         u8 temp[4];
 107 };
 108
 109 static int smsc47b397_read_value(struct smsc47b397_data* data, u8 reg)
 110 {
 111         int res;
 112
 113         mutex_lock(&data->lock);
 114         outb(reg, data->addr);
 115         res = inb_p(data->addr + 1);
 116         mutex_unlock(&data->lock);
 117         return res;
 118 }
 119
 120 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
 121 {
 122         struct smsc47b397_data *data = dev_get_drvdata(dev);
 123         int i;
 124
 125         mutex_lock(&data->update_lock);
 126
 127         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 128                 dev_dbg(dev, "starting device update...\n");
 129
 130                 /* 4 temperature inputs, 4 fan inputs */
 131                 for (i = 0; i < 4; i++) {
 132                         data->temp[i] = smsc47b397_read_value(data,
 133                                         SMSC47B397_REG_TEMP(i));
 134
 135                         /* must read LSB first */
 136                         data->fan[i]  = smsc47b397_read_value(data,
 137                                         SMSC47B397_REG_FAN_LSB(i));
 138                         data->fan[i] |= smsc47b397_read_value(data,
 139                                         SMSC47B397_REG_FAN_MSB(i)) << 8;
 140                 }
 141
 142                 data->last_updated = jiffies;
 143                 data->valid = 1;
 144
 145                 dev_dbg(dev, "... device update complete\n");
 146         }
 147
 148         mutex_unlock(&data->update_lock);
 149
 150         return data;
 151 }
 152
 153 /* TEMP: 0.001C/bit (-128C to +127C)
 154    REG: 1C/bit, two's complement */
 155 static int temp_from_reg(u8 reg)
 156 {
 157         return (s8)reg * 1000;
 158 }
 159
 160 static ssize_t show_temp(struct device *dev, struct device_attribute
 161                          *devattr, char *buf)
 162 {
 163         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 164         struct smsc47b397_data *data = smsc47b397_update_device(dev);
 165         return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
 166 }
 167
 168 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 169 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 170 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 171 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
 172
 173 /* FAN: 1 RPM/bit
 174    REG: count of 90kHz pulses / revolution */
 175 static int fan_from_reg(u16 reg)
 176 {
 177         if (reg == 0 || reg == 0xffff)
 178                 return 0;
 179         return 90000 * 60 / reg;
 180 }
 181
 182 static ssize_t show_fan(struct device *dev, struct device_attribute
 183                         *devattr, char *buf)
 184 {
 185         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 186         struct smsc47b397_data *data = smsc47b397_update_device(dev);
 187         return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
 188 }
 189 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
 190 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
 191 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
 192 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
 193
 194 static ssize_t show_name(struct device *dev, struct device_attribute
 195                          *devattr, char *buf)
 196 {
 197         struct smsc47b397_data *data = dev_get_drvdata(dev);
 198         return sprintf(buf, "%s\n", data->name);
 199 }
 200 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 201
 202 static struct attribute *smsc47b397_attributes[] = {
 203         &sensor_dev_attr_temp1_input.dev_attr.attr,
 204         &sensor_dev_attr_temp2_input.dev_attr.attr,
 205         &sensor_dev_attr_temp3_input.dev_attr.attr,
 206         &sensor_dev_attr_temp4_input.dev_attr.attr,
 207         &sensor_dev_attr_fan1_input.dev_attr.attr,
 208         &sensor_dev_attr_fan2_input.dev_attr.attr,
 209         &sensor_dev_attr_fan3_input.dev_attr.attr,
 210         &sensor_dev_attr_fan4_input.dev_attr.attr,
 211
 212         &dev_attr_name.attr,
 213         NULL
 214 };
 215
 216 static const struct attribute_group smsc47b397_group = {
 217         .attrs = smsc47b397_attributes,
 218 };
 219
 220 static int __devexit smsc47b397_remove(struct platform_device *pdev)
 221 {
 222         struct smsc47b397_data *data = platform_get_drvdata(pdev);
 223         struct resource *res;
 224
 225         hwmon_device_unregister(data->class_dev);
 226         sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group);
 227         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 228         release_region(res->start, SMSC_EXTENT);
 229         kfree(data);
 230
 231         return 0;
 232 }
 233
 234 static int smsc47b397_probe(struct platform_device *pdev);
 235
 236 static struct platform_driver smsc47b397_driver = {
 237         .driver = {
 238                 .owner  = THIS_MODULE,
 239                 .name   = DRVNAME,
 240         },
 241         .probe          = smsc47b397_probe,
 242         .remove         = __devexit_p(smsc47b397_remove),
 243 };
 244
 245 static int __devinit smsc47b397_probe(struct platform_device *pdev)
 246 {
 247         struct device *dev = &pdev->dev;
 248         struct smsc47b397_data *data;
 249         struct resource *res;
 250         int err = 0;
 251
 252         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 253         if (!request_region(res->start, SMSC_EXTENT,
 254                             smsc47b397_driver.driver.name)) {
 255                 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
 256                         (unsigned long)res->start,
 257                         (unsigned long)res->start + SMSC_EXTENT - 1);
 258                 return -EBUSY;
 259         }
 260
 261         if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
 262                 err = -ENOMEM;
 263                 goto error_release;
 264         }
 265
 266         data->addr = res->start;
 267         data->name = "smsc47b397";
 268         mutex_init(&data->lock);
 269         mutex_init(&data->update_lock);
 270         platform_set_drvdata(pdev, data);
 271
 272         if ((err = sysfs_create_group(&dev->kobj, &smsc47b397_group)))
 273                 goto error_free;
 274
 275         data->class_dev = hwmon_device_register(dev);
 276         if (IS_ERR(data->class_dev)) {
 277                 err = PTR_ERR(data->class_dev);
 278                 goto error_remove;
 279         }
 280
 281         return 0;
 282
 283 error_remove:
 284         sysfs_remove_group(&dev->kobj, &smsc47b397_group);
 285 error_free:
 286         kfree(data);
 287 error_release:
 288         release_region(res->start, SMSC_EXTENT);
 289         return err;
 290 }
 291
 292 static int __init smsc47b397_device_add(unsigned short address)
 293 {
 294         struct resource res = {
 295                 .start  = address,
 296                 .end    = address + SMSC_EXTENT - 1,
 297                 .name   = DRVNAME,
 298                 .flags  = IORESOURCE_IO,
 299         };
 300         int err;
 301
 302         pdev = platform_device_alloc(DRVNAME, address);
 303         if (!pdev) {
 304                 err = -ENOMEM;
 305                 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
 306                 goto exit;
 307         }
 308
 309         err = platform_device_add_resources(pdev, &res, 1);
 310         if (err) {
 311                 printk(KERN_ERR DRVNAME ": Device resource addition failed "
 312                        "(%d)\n", err);
 313                 goto exit_device_put;
 314         }
 315
 316         err = platform_device_add(pdev);
 317         if (err) {
 318                 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
 319                        err);
 320                 goto exit_device_put;
 321         }
 322
 323         return 0;
 324
 325 exit_device_put:
 326         platform_device_put(pdev);
 327 exit:
 328         return err;
 329 }
 330
 331 static int __init smsc47b397_find(unsigned short *addr)
 332 {
 333         u8 id, rev;
 334
 335         superio_enter();
 336         id = superio_inb(SUPERIO_REG_DEVID);
 337
 338         if ((id != 0x6f) && (id != 0x81) && (id != 0x85)) {
 339                 superio_exit();
 340                 return -ENODEV;
 341         }
 342
 343         rev = superio_inb(SUPERIO_REG_DEVREV);
 344
 345         superio_select(SUPERIO_REG_LD8);
 346         *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
 347                  |  superio_inb(SUPERIO_REG_BASE_LSB);
 348
 349         printk(KERN_INFO DRVNAME ": found SMSC %s "
 350                 "(base address 0x%04x, revision %u)\n",
 351                 id == 0x81 ? "SCH5307-NS" : id == 0x85 ? "SCH5317" :
 352                "LPC47B397-NC", *addr, rev);
 353
 354         superio_exit();
 355         return 0;
 356 }
 357
 358 static int __init smsc47b397_init(void)
 359 {
 360         unsigned short address;
 361         int ret;
 362
 363         if ((ret = smsc47b397_find(&address)))
 364                 return ret;
 365
 366         ret = platform_driver_register(&smsc47b397_driver);
 367         if (ret)
 368                 goto exit;
 369
 370         /* Sets global pdev as a side effect */
 371         ret = smsc47b397_device_add(address);
 372         if (ret)
 373                 goto exit_driver;
 374
 375         return 0;
 376
 377 exit_driver:
 378         platform_driver_unregister(&smsc47b397_driver);
 379 exit:
 380         return ret;
 381 }
 382
 383 static void __exit smsc47b397_exit(void)
 384 {
 385         platform_device_unregister(pdev);
 386         platform_driver_unregister(&smsc47b397_driver);
 387 }
 388
 389 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 390 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
 391 MODULE_LICENSE("GPL");
 392
 393 module_init(smsc47b397_init);
 394 module_exit(smsc47b397_exit);