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/i2c.h>
  34 #include <linux/i2c-isa.h>
  35 #include <linux/hwmon.h>
  36 #include <linux/err.h>
  37 #include <linux/init.h>
  38 #include <asm/io.h>
  39
  40 /* Address is autodetected, there is no default value */
  41 static unsigned short address;
  42
  43 /* Super-I/0 registers and commands */
  44
  45 #define REG     0x2e    /* The register to read/write */
  46 #define VAL     0x2f    /* The value to read/write */
  47
  48 static inline void superio_outb(int reg, int val)
  49 {
  50         outb(reg, REG);
  51         outb(val, VAL);
  52 }
  53
  54 static inline int superio_inb(int reg)
  55 {
  56         outb(reg, REG);
  57         return inb(VAL);
  58 }
  59
  60 /* select superio logical device */
  61 static inline void superio_select(int ld)
  62 {
  63         superio_outb(0x07, ld);
  64 }
  65
  66 static inline void superio_enter(void)
  67 {
  68         outb(0x55, REG);
  69 }
  70
  71 static inline void superio_exit(void)
  72 {
  73         outb(0xAA, REG);
  74 }
  75
  76 #define SUPERIO_REG_DEVID       0x20
  77 #define SUPERIO_REG_DEVREV      0x21
  78 #define SUPERIO_REG_BASE_MSB    0x60
  79 #define SUPERIO_REG_BASE_LSB    0x61
  80 #define SUPERIO_REG_LD8         0x08
  81
  82 #define SMSC_EXTENT             0x02
  83
  84 /* 0 <= nr <= 3 */
  85 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
  86 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
  87
  88 /* 0 <= nr <= 3 */
  89 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
  90 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
  91
  92 struct smsc47b397_data {
  93         struct i2c_client client;
  94         struct class_device *class_dev;
  95         struct semaphore lock;
  96
  97         struct semaphore update_lock;
  98         unsigned long last_updated; /* in jiffies */
  99         int valid;
 100
 101         /* register values */
 102         u16 fan[4];
 103         u8 temp[4];
 104 };
 105
 106 static int smsc47b397_read_value(struct i2c_client *client, u8 reg)
 107 {
 108         struct smsc47b397_data *data = i2c_get_clientdata(client);
 109         int res;
 110
 111         down(&data->lock);
 112         outb(reg, client->addr);
 113         res = inb_p(client->addr + 1);
 114         up(&data->lock);
 115         return res;
 116 }
 117
 118 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
 119 {
 120         struct i2c_client *client = to_i2c_client(dev);
 121         struct smsc47b397_data *data = i2c_get_clientdata(client);
 122         int i;
 123
 124         down(&data->update_lock);
 125
 126         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 127                 dev_dbg(&client->dev, "starting device update...\n");
 128
 129                 /* 4 temperature inputs, 4 fan inputs */
 130                 for (i = 0; i < 4; i++) {
 131                         data->temp[i] = smsc47b397_read_value(client,
 132                                         SMSC47B397_REG_TEMP(i));
 133
 134                         /* must read LSB first */
 135                         data->fan[i]  = smsc47b397_read_value(client,
 136                                         SMSC47B397_REG_FAN_LSB(i));
 137                         data->fan[i] |= smsc47b397_read_value(client,
 138                                         SMSC47B397_REG_FAN_MSB(i)) << 8;
 139                 }
 140
 141                 data->last_updated = jiffies;
 142                 data->valid = 1;
 143
 144                 dev_dbg(&client->dev, "... device update complete\n");
 145         }
 146
 147         up(&data->update_lock);
 148
 149         return data;
 150 }
 151
 152 /* TEMP: 0.001C/bit (-128C to +127C)
 153    REG: 1C/bit, two's complement */
 154 static int temp_from_reg(u8 reg)
 155 {
 156         return (s8)reg * 1000;
 157 }
 158
 159 /* 0 <= nr <= 3 */
 160 static ssize_t show_temp(struct device *dev, char *buf, int nr)
 161 {
 162         struct smsc47b397_data *data = smsc47b397_update_device(dev);
 163         return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
 164 }
 165
 166 #define sysfs_temp(num) \
 167 static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \
 168 { \
 169         return show_temp(dev, buf, num-1); \
 170 } \
 171 static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)
 172
 173 sysfs_temp(1);
 174 sysfs_temp(2);
 175 sysfs_temp(3);
 176 sysfs_temp(4);
 177
 178 #define device_create_file_temp(client, num) \
 179         device_create_file(&client->dev, &dev_attr_temp##num##_input)
 180
 181 /* FAN: 1 RPM/bit
 182    REG: count of 90kHz pulses / revolution */
 183 static int fan_from_reg(u16 reg)
 184 {
 185         return 90000 * 60 / reg;
 186 }
 187
 188 /* 0 <= nr <= 3 */
 189 static ssize_t show_fan(struct device *dev, char *buf, int nr)
 190 {
 191         struct smsc47b397_data *data = smsc47b397_update_device(dev);
 192         return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
 193 }
 194
 195 #define sysfs_fan(num) \
 196 static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \
 197 { \
 198         return show_fan(dev, buf, num-1); \
 199 } \
 200 static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)
 201
 202 sysfs_fan(1);
 203 sysfs_fan(2);
 204 sysfs_fan(3);
 205 sysfs_fan(4);
 206
 207 #define device_create_file_fan(client, num) \
 208         device_create_file(&client->dev, &dev_attr_fan##num##_input)
 209
 210 static int smsc47b397_detach_client(struct i2c_client *client)
 211 {
 212         struct smsc47b397_data *data = i2c_get_clientdata(client);
 213         int err;
 214
 215         hwmon_device_unregister(data->class_dev);
 216
 217         if ((err = i2c_detach_client(client)))
 218                 return err;
 219
 220         release_region(client->addr, SMSC_EXTENT);
 221         kfree(data);
 222
 223         return 0;
 224 }
 225
 226 static int smsc47b397_detect(struct i2c_adapter *adapter);
 227
 228 static struct i2c_driver smsc47b397_driver = {
 229         .owner          = THIS_MODULE,
 230         .name           = "smsc47b397",
 231         .attach_adapter = smsc47b397_detect,
 232         .detach_client  = smsc47b397_detach_client,
 233 };
 234
 235 static int smsc47b397_detect(struct i2c_adapter *adapter)
 236 {
 237         struct i2c_client *new_client;
 238         struct smsc47b397_data *data;
 239         int err = 0;
 240
 241         if (!request_region(address, SMSC_EXTENT, smsc47b397_driver.name)) {
 242                 dev_err(&adapter->dev, "Region 0x%x already in use!\n",
 243                         address);
 244                 return -EBUSY;
 245         }
 246
 247         if (!(data = kmalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
 248                 err = -ENOMEM;
 249                 goto error_release;
 250         }
 251         memset(data, 0x00, sizeof(struct smsc47b397_data));
 252
 253         new_client = &data->client;
 254         i2c_set_clientdata(new_client, data);
 255         new_client->addr = address;
 256         init_MUTEX(&data->lock);
 257         new_client->adapter = adapter;
 258         new_client->driver = &smsc47b397_driver;
 259         new_client->flags = 0;
 260
 261         strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE);
 262
 263         init_MUTEX(&data->update_lock);
 264
 265         if ((err = i2c_attach_client(new_client)))
 266                 goto error_free;
 267
 268         data->class_dev = hwmon_device_register(&new_client->dev);
 269         if (IS_ERR(data->class_dev)) {
 270                 err = PTR_ERR(data->class_dev);
 271                 goto error_detach;
 272         }
 273
 274         device_create_file_temp(new_client, 1);
 275         device_create_file_temp(new_client, 2);
 276         device_create_file_temp(new_client, 3);
 277         device_create_file_temp(new_client, 4);
 278
 279         device_create_file_fan(new_client, 1);
 280         device_create_file_fan(new_client, 2);
 281         device_create_file_fan(new_client, 3);
 282         device_create_file_fan(new_client, 4);
 283
 284         return 0;
 285
 286 error_detach:
 287         i2c_detach_client(new_client);
 288 error_free:
 289         kfree(data);
 290 error_release:
 291         release_region(address, SMSC_EXTENT);
 292         return err;
 293 }
 294
 295 static int __init smsc47b397_find(unsigned short *addr)
 296 {
 297         u8 id, rev;
 298
 299         superio_enter();
 300         id = superio_inb(SUPERIO_REG_DEVID);
 301
 302         if (id != 0x6f) {
 303                 superio_exit();
 304                 return -ENODEV;
 305         }
 306
 307         rev = superio_inb(SUPERIO_REG_DEVREV);
 308
 309         superio_select(SUPERIO_REG_LD8);
 310         *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
 311                  |  superio_inb(SUPERIO_REG_BASE_LSB);
 312
 313         printk(KERN_INFO "smsc47b397: found SMSC LPC47B397-NC "
 314                 "(base address 0x%04x, revision %u)\n", *addr, rev);
 315
 316         superio_exit();
 317         return 0;
 318 }
 319
 320 static int __init smsc47b397_init(void)
 321 {
 322         int ret;
 323
 324         if ((ret = smsc47b397_find(&address)))
 325                 return ret;
 326
 327         return i2c_isa_add_driver(&smsc47b397_driver);
 328 }
 329
 330 static void __exit smsc47b397_exit(void)
 331 {
 332         i2c_isa_del_driver(&smsc47b397_driver);
 333 }
 334
 335 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 336 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
 337 MODULE_LICENSE("GPL");
 338
 339 module_init(smsc47b397_init);
 340 module_exit(smsc47b397_exit);