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 int superio_enter(void)
  76 {
  77         if (!request_muxed_region(REG, 2, DRVNAME))
  78                 return -EBUSY;
  79
  80         outb(0x55, REG);
  81         return 0;
  82 }
  83
  84 static inline void superio_exit(void)
  85 {
  86         outb(0xAA, REG);
  87         release_region(REG, 2);
  88 }
  89
  90 #define SUPERIO_REG_DEVID       0x20
  91 #define SUPERIO_REG_DEVREV      0x21
  92 #define SUPERIO_REG_BASE_MSB    0x60
  93 #define SUPERIO_REG_BASE_LSB    0x61
  94 #define SUPERIO_REG_LD8         0x08
  95
  96 #define SMSC_EXTENT             0x02
  97
  98 /* 0 <= nr <= 3 */
  99 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
 100 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
 101
 102 /* 0 <= nr <= 3 */
 103 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
 104 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
 105
 106 struct smsc47b397_data {
 107         unsigned short addr;
 108         struct mutex lock;
 109
 110         struct mutex update_lock;
 111         unsigned long last_updated; /* in jiffies */
 112         int valid;
 113
 114         /* register values */
 115         u16 fan[4];
 116         u8 temp[4];
 117 };
 118
 119 static int smsc47b397_read_value(struct smsc47b397_data *data, u8 reg)
 120 {
 121         int res;
 122
 123         mutex_lock(&data->lock);
 124         outb(reg, data->addr);
 125         res = inb_p(data->addr + 1);
 126         mutex_unlock(&data->lock);
 127         return res;
 128 }
 129
 130 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
 131 {
 132         struct smsc47b397_data *data = dev_get_drvdata(dev);
 133         int i;
 134
 135         mutex_lock(&data->update_lock);
 136
 137         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 138                 dev_dbg(dev, "starting device update...\n");
 139
 140                 /* 4 temperature inputs, 4 fan inputs */
 141                 for (i = 0; i < 4; i++) {
 142                         data->temp[i] = smsc47b397_read_value(data,
 143                                         SMSC47B397_REG_TEMP(i));
 144
 145                         /* must read LSB first */
 146                         data->fan[i]  = smsc47b397_read_value(data,
 147                                         SMSC47B397_REG_FAN_LSB(i));
 148                         data->fan[i] |= smsc47b397_read_value(data,
 149                                         SMSC47B397_REG_FAN_MSB(i)) << 8;
 150                 }
 151
 152                 data->last_updated = jiffies;
 153                 data->valid = 1;
 154
 155                 dev_dbg(dev, "... device update complete\n");
 156         }
 157
 158         mutex_unlock(&data->update_lock);
 159
 160         return data;
 161 }
 162
 163 /*
 164  * TEMP: 0.001C/bit (-128C to +127C)
 165  * REG: 1C/bit, two's complement
 166  */
 167 static int temp_from_reg(u8 reg)
 168 {
 169         return (s8)reg * 1000;
 170 }
 171
 172 static ssize_t show_temp(struct device *dev, struct device_attribute
 173                          *devattr, char *buf)
 174 {
 175         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 176         struct smsc47b397_data *data = smsc47b397_update_device(dev);
 177         return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
 178 }
 179
 180 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 181 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 182 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 183 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
 184
 185 /*
 186  * FAN: 1 RPM/bit
 187  * REG: count of 90kHz pulses / revolution
 188  */
 189 static int fan_from_reg(u16 reg)
 190 {
 191         if (reg == 0 || reg == 0xffff)
 192                 return 0;
 193         return 90000 * 60 / reg;
 194 }
 195
 196 static ssize_t show_fan(struct device *dev, struct device_attribute
 197                         *devattr, char *buf)
 198 {
 199         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 200         struct smsc47b397_data *data = smsc47b397_update_device(dev);
 201         return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
 202 }
 203 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
 204 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
 205 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
 206 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
 207
 208 static struct attribute *smsc47b397_attrs[] = {
 209         &sensor_dev_attr_temp1_input.dev_attr.attr,
 210         &sensor_dev_attr_temp2_input.dev_attr.attr,
 211         &sensor_dev_attr_temp3_input.dev_attr.attr,
 212         &sensor_dev_attr_temp4_input.dev_attr.attr,
 213         &sensor_dev_attr_fan1_input.dev_attr.attr,
 214         &sensor_dev_attr_fan2_input.dev_attr.attr,
 215         &sensor_dev_attr_fan3_input.dev_attr.attr,
 216         &sensor_dev_attr_fan4_input.dev_attr.attr,
 217
 218         NULL
 219 };
 220
 221 ATTRIBUTE_GROUPS(smsc47b397);
 222
 223 static int smsc47b397_probe(struct platform_device *pdev);
 224
 225 static struct platform_driver smsc47b397_driver = {
 226         .driver = {
 227                 .name   = DRVNAME,
 228         },
 229         .probe          = smsc47b397_probe,
 230 };
 231
 232 static int smsc47b397_probe(struct platform_device *pdev)
 233 {
 234         struct device *dev = &pdev->dev;
 235         struct smsc47b397_data *data;
 236         struct device *hwmon_dev;
 237         struct resource *res;
 238
 239         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 240         if (!devm_request_region(dev, res->start, SMSC_EXTENT,
 241                                  smsc47b397_driver.driver.name)) {
 242                 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
 243                         (unsigned long)res->start,
 244                         (unsigned long)res->start + SMSC_EXTENT - 1);
 245                 return -EBUSY;
 246         }
 247
 248         data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL);
 249         if (!data)
 250                 return -ENOMEM;
 251
 252         data->addr = res->start;
 253         mutex_init(&data->lock);
 254         mutex_init(&data->update_lock);
 255
 256         hwmon_dev = devm_hwmon_device_register_with_groups(dev, "smsc47b397",
 257                                                            data,
 258                                                            smsc47b397_groups);
 259         return PTR_ERR_OR_ZERO(hwmon_dev);
 260 }
 261
 262 static int __init smsc47b397_device_add(unsigned short address)
 263 {
 264         struct resource res = {
 265                 .start  = address,
 266                 .end    = address + SMSC_EXTENT - 1,
 267                 .name   = DRVNAME,
 268                 .flags  = IORESOURCE_IO,
 269         };
 270         int err;
 271
 272         err = acpi_check_resource_conflict(&res);
 273         if (err)
 274                 goto exit;
 275
 276         pdev = platform_device_alloc(DRVNAME, address);
 277         if (!pdev) {
 278                 err = -ENOMEM;
 279                 pr_err("Device allocation failed\n");
 280                 goto exit;
 281         }
 282
 283         err = platform_device_add_resources(pdev, &res, 1);
 284         if (err) {
 285                 pr_err("Device resource addition failed (%d)\n", err);
 286                 goto exit_device_put;
 287         }
 288
 289         err = platform_device_add(pdev);
 290         if (err) {
 291                 pr_err("Device addition failed (%d)\n", err);
 292                 goto exit_device_put;
 293         }
 294
 295         return 0;
 296
 297 exit_device_put:
 298         platform_device_put(pdev);
 299 exit:
 300         return err;
 301 }
 302
 303 static int __init smsc47b397_find(void)
 304 {
 305         u8 id, rev;
 306         char *name;
 307         unsigned short addr;
 308         int err;
 309
 310         err = superio_enter();
 311         if (err)
 312                 return err;
 313
 314         id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
 315
 316         switch (id) {
 317         case 0x81:
 318                 name = "SCH5307-NS";
 319                 break;
 320         case 0x6f:
 321                 name = "LPC47B397-NC";
 322                 break;
 323         case 0x85:
 324         case 0x8c:
 325                 name = "SCH5317";
 326                 break;
 327         default:
 328                 superio_exit();
 329                 return -ENODEV;
 330         }
 331
 332         rev = superio_inb(SUPERIO_REG_DEVREV);
 333
 334         superio_select(SUPERIO_REG_LD8);
 335         addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
 336                  |  superio_inb(SUPERIO_REG_BASE_LSB);
 337
 338         pr_info("found SMSC %s (base address 0x%04x, revision %u)\n",
 339                 name, addr, rev);
 340
 341         superio_exit();
 342         return addr;
 343 }
 344
 345 static int __init smsc47b397_init(void)
 346 {
 347         unsigned short address;
 348         int ret;
 349
 350         ret = smsc47b397_find();
 351         if (ret < 0)
 352                 return ret;
 353         address = ret;
 354
 355         ret = platform_driver_register(&smsc47b397_driver);
 356         if (ret)
 357                 goto exit;
 358
 359         /* Sets global pdev as a side effect */
 360         ret = smsc47b397_device_add(address);
 361         if (ret)
 362                 goto exit_driver;
 363
 364         return 0;
 365
 366 exit_driver:
 367         platform_driver_unregister(&smsc47b397_driver);
 368 exit:
 369         return ret;
 370 }
 371
 372 static void __exit smsc47b397_exit(void)
 373 {
 374         platform_device_unregister(pdev);
 375         platform_driver_unregister(&smsc47b397_driver);
 376 }
 377
 378 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 379 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
 380 MODULE_LICENSE("GPL");
 381
 382 module_init(smsc47b397_init);
 383 module_exit(smsc47b397_exit);