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