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 <linux/mutex.h> 39 #include <asm/io.h> 40 41 /* Address is autodetected, there is no default value */ 42 static unsigned short address; 43 44 /* Super-I/0 registers and commands */ 45 46 #define REG 0x2e /* The register to read/write */ 47 #define VAL 0x2f /* The value to read/write */ 48 49 static inline void superio_outb(int reg, int val) 50 { 51 outb(reg, REG); 52 outb(val, VAL); 53 } 54 55 static inline int superio_inb(int reg) 56 { 57 outb(reg, REG); 58 return inb(VAL); 59 } 60 61 /* select superio logical device */ 62 static inline void superio_select(int ld) 63 { 64 superio_outb(0x07, ld); 65 } 66 67 static inline void superio_enter(void) 68 { 69 outb(0x55, REG); 70 } 71 72 static inline void superio_exit(void) 73 { 74 outb(0xAA, REG); 75 } 76 77 #define SUPERIO_REG_DEVID 0x20 78 #define SUPERIO_REG_DEVREV 0x21 79 #define SUPERIO_REG_BASE_MSB 0x60 80 #define SUPERIO_REG_BASE_LSB 0x61 81 #define SUPERIO_REG_LD8 0x08 82 83 #define SMSC_EXTENT 0x02 84 85 /* 0 <= nr <= 3 */ 86 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80}; 87 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)]) 88 89 /* 0 <= nr <= 3 */ 90 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr)) 91 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr)) 92 93 struct smsc47b397_data { 94 struct i2c_client client; 95 struct class_device *class_dev; 96 struct mutex lock; 97 98 struct mutex update_lock; 99 unsigned long last_updated; /* in jiffies */ 100 int valid; 101 102 /* register values */ 103 u16 fan[4]; 104 u8 temp[4]; 105 }; 106 107 static int smsc47b397_read_value(struct i2c_client *client, u8 reg) 108 { 109 struct smsc47b397_data *data = i2c_get_clientdata(client); 110 int res; 111 112 mutex_lock(&data->lock); 113 outb(reg, client->addr); 114 res = inb_p(client->addr + 1); 115 mutex_unlock(&data->lock); 116 return res; 117 } 118 119 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) 120 { 121 struct i2c_client *client = to_i2c_client(dev); 122 struct smsc47b397_data *data = i2c_get_clientdata(client); 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(&client->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(client, 133 SMSC47B397_REG_TEMP(i)); 134 135 /* must read LSB first */ 136 data->fan[i] = smsc47b397_read_value(client, 137 SMSC47B397_REG_FAN_LSB(i)); 138 data->fan[i] |= smsc47b397_read_value(client, 139 SMSC47B397_REG_FAN_MSB(i)) << 8; 140 } 141 142 data->last_updated = jiffies; 143 data->valid = 1; 144 145 dev_dbg(&client->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 /* 0 <= nr <= 3 */ 161 static ssize_t show_temp(struct device *dev, char *buf, int nr) 162 { 163 struct smsc47b397_data *data = smsc47b397_update_device(dev); 164 return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr])); 165 } 166 167 #define sysfs_temp(num) \ 168 static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \ 169 { \ 170 return show_temp(dev, buf, num-1); \ 171 } \ 172 static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL) 173 174 sysfs_temp(1); 175 sysfs_temp(2); 176 sysfs_temp(3); 177 sysfs_temp(4); 178 179 /* FAN: 1 RPM/bit 180 REG: count of 90kHz pulses / revolution */ 181 static int fan_from_reg(u16 reg) 182 { 183 return 90000 * 60 / reg; 184 } 185 186 /* 0 <= nr <= 3 */ 187 static ssize_t show_fan(struct device *dev, char *buf, int nr) 188 { 189 struct smsc47b397_data *data = smsc47b397_update_device(dev); 190 return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr])); 191 } 192 193 #define sysfs_fan(num) \ 194 static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \ 195 { \ 196 return show_fan(dev, buf, num-1); \ 197 } \ 198 static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL) 199 200 sysfs_fan(1); 201 sysfs_fan(2); 202 sysfs_fan(3); 203 sysfs_fan(4); 204 205 static struct attribute *smsc47b397_attributes[] = { 206 &dev_attr_temp1_input.attr, 207 &dev_attr_temp2_input.attr, 208 &dev_attr_temp3_input.attr, 209 &dev_attr_temp4_input.attr, 210 &dev_attr_fan1_input.attr, 211 &dev_attr_fan2_input.attr, 212 &dev_attr_fan3_input.attr, 213 &dev_attr_fan4_input.attr, 214 215 NULL 216 }; 217 218 static const struct attribute_group smsc47b397_group = { 219 .attrs = smsc47b397_attributes, 220 }; 221 222 static int smsc47b397_detach_client(struct i2c_client *client) 223 { 224 struct smsc47b397_data *data = i2c_get_clientdata(client); 225 int err; 226 227 hwmon_device_unregister(data->class_dev); 228 sysfs_remove_group(&client->dev.kobj, &smsc47b397_group); 229 230 if ((err = i2c_detach_client(client))) 231 return err; 232 233 release_region(client->addr, SMSC_EXTENT); 234 kfree(data); 235 236 return 0; 237 } 238 239 static int smsc47b397_detect(struct i2c_adapter *adapter); 240 241 static struct i2c_driver smsc47b397_driver = { 242 .driver = { 243 .owner = THIS_MODULE, 244 .name = "smsc47b397", 245 }, 246 .attach_adapter = smsc47b397_detect, 247 .detach_client = smsc47b397_detach_client, 248 }; 249 250 static int smsc47b397_detect(struct i2c_adapter *adapter) 251 { 252 struct i2c_client *new_client; 253 struct smsc47b397_data *data; 254 int err = 0; 255 256 if (!request_region(address, SMSC_EXTENT, 257 smsc47b397_driver.driver.name)) { 258 dev_err(&adapter->dev, "Region 0x%x already in use!\n", 259 address); 260 return -EBUSY; 261 } 262 263 if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { 264 err = -ENOMEM; 265 goto error_release; 266 } 267 268 new_client = &data->client; 269 i2c_set_clientdata(new_client, data); 270 new_client->addr = address; 271 mutex_init(&data->lock); 272 new_client->adapter = adapter; 273 new_client->driver = &smsc47b397_driver; 274 new_client->flags = 0; 275 276 strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE); 277 278 mutex_init(&data->update_lock); 279 280 if ((err = i2c_attach_client(new_client))) 281 goto error_free; 282 283 if ((err = sysfs_create_group(&new_client->dev.kobj, &smsc47b397_group))) 284 goto error_detach; 285 286 data->class_dev = hwmon_device_register(&new_client->dev); 287 if (IS_ERR(data->class_dev)) { 288 err = PTR_ERR(data->class_dev); 289 goto error_remove; 290 } 291 292 return 0; 293 294 error_remove: 295 sysfs_remove_group(&new_client->dev.kobj, &smsc47b397_group); 296 error_detach: 297 i2c_detach_client(new_client); 298 error_free: 299 kfree(data); 300 error_release: 301 release_region(address, SMSC_EXTENT); 302 return err; 303 } 304 305 static int __init smsc47b397_find(unsigned short *addr) 306 { 307 u8 id, rev; 308 309 superio_enter(); 310 id = superio_inb(SUPERIO_REG_DEVID); 311 312 if ((id != 0x6f) && (id != 0x81)) { 313 superio_exit(); 314 return -ENODEV; 315 } 316 317 rev = superio_inb(SUPERIO_REG_DEVREV); 318 319 superio_select(SUPERIO_REG_LD8); 320 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) 321 | superio_inb(SUPERIO_REG_BASE_LSB); 322 323 printk(KERN_INFO "smsc47b397: found SMSC %s " 324 "(base address 0x%04x, revision %u)\n", 325 id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev); 326 327 superio_exit(); 328 return 0; 329 } 330 331 static int __init smsc47b397_init(void) 332 { 333 int ret; 334 335 if ((ret = smsc47b397_find(&address))) 336 return ret; 337 338 return i2c_isa_add_driver(&smsc47b397_driver); 339 } 340 341 static void __exit smsc47b397_exit(void) 342 { 343 i2c_isa_del_driver(&smsc47b397_driver); 344 } 345 346 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 347 MODULE_DESCRIPTION("SMSC LPC47B397 driver"); 348 MODULE_LICENSE("GPL"); 349 350 module_init(smsc47b397_init); 351 module_exit(smsc47b397_exit); 352