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/i2c-sensor.h> 36 #include <linux/hwmon.h> 37 #include <linux/err.h> 38 #include <linux/init.h> 39 #include <asm/io.h> 40 41 static unsigned short normal_i2c[] = { I2C_CLIENT_END }; 42 /* Address is autodetected, there is no default value */ 43 static unsigned int normal_isa[] = { 0x0000, I2C_CLIENT_ISA_END }; 44 static struct i2c_force_data forces[] = {{NULL}}; 45 46 enum chips { any_chip, smsc47b397 }; 47 static struct i2c_address_data addr_data = { 48 .normal_i2c = normal_i2c, 49 .normal_isa = normal_isa, 50 .probe = normal_i2c, /* cheat */ 51 .ignore = normal_i2c, /* cheat */ 52 .forces = forces, 53 }; 54 55 /* Super-I/0 registers and commands */ 56 57 #define REG 0x2e /* The register to read/write */ 58 #define VAL 0x2f /* The value to read/write */ 59 60 static inline void superio_outb(int reg, int val) 61 { 62 outb(reg, REG); 63 outb(val, VAL); 64 } 65 66 static inline int superio_inb(int reg) 67 { 68 outb(reg, REG); 69 return inb(VAL); 70 } 71 72 /* select superio logical device */ 73 static inline void superio_select(int ld) 74 { 75 superio_outb(0x07, ld); 76 } 77 78 static inline void superio_enter(void) 79 { 80 outb(0x55, REG); 81 } 82 83 static inline void superio_exit(void) 84 { 85 outb(0xAA, REG); 86 } 87 88 #define SUPERIO_REG_DEVID 0x20 89 #define SUPERIO_REG_DEVREV 0x21 90 #define SUPERIO_REG_BASE_MSB 0x60 91 #define SUPERIO_REG_BASE_LSB 0x61 92 #define SUPERIO_REG_LD8 0x08 93 94 #define SMSC_EXTENT 0x02 95 96 /* 0 <= nr <= 3 */ 97 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80}; 98 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)]) 99 100 /* 0 <= nr <= 3 */ 101 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr)) 102 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr)) 103 104 struct smsc47b397_data { 105 struct i2c_client client; 106 struct class_device *class_dev; 107 struct semaphore lock; 108 109 struct semaphore update_lock; 110 unsigned long last_updated; /* in jiffies */ 111 int valid; 112 113 /* register values */ 114 u16 fan[4]; 115 u8 temp[4]; 116 }; 117 118 static int smsc47b397_read_value(struct i2c_client *client, u8 reg) 119 { 120 struct smsc47b397_data *data = i2c_get_clientdata(client); 121 int res; 122 123 down(&data->lock); 124 outb(reg, client->addr); 125 res = inb_p(client->addr + 1); 126 up(&data->lock); 127 return res; 128 } 129 130 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) 131 { 132 struct i2c_client *client = to_i2c_client(dev); 133 struct smsc47b397_data *data = i2c_get_clientdata(client); 134 int i; 135 136 down(&data->update_lock); 137 138 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 139 dev_dbg(&client->dev, "starting device update...\n"); 140 141 /* 4 temperature inputs, 4 fan inputs */ 142 for (i = 0; i < 4; i++) { 143 data->temp[i] = smsc47b397_read_value(client, 144 SMSC47B397_REG_TEMP(i)); 145 146 /* must read LSB first */ 147 data->fan[i] = smsc47b397_read_value(client, 148 SMSC47B397_REG_FAN_LSB(i)); 149 data->fan[i] |= smsc47b397_read_value(client, 150 SMSC47B397_REG_FAN_MSB(i)) << 8; 151 } 152 153 data->last_updated = jiffies; 154 data->valid = 1; 155 156 dev_dbg(&client->dev, "... device update complete\n"); 157 } 158 159 up(&data->update_lock); 160 161 return data; 162 } 163 164 /* TEMP: 0.001C/bit (-128C to +127C) 165 REG: 1C/bit, two's complement */ 166 static int temp_from_reg(u8 reg) 167 { 168 return (s8)reg * 1000; 169 } 170 171 /* 0 <= nr <= 3 */ 172 static ssize_t show_temp(struct device *dev, char *buf, int nr) 173 { 174 struct smsc47b397_data *data = smsc47b397_update_device(dev); 175 return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr])); 176 } 177 178 #define sysfs_temp(num) \ 179 static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \ 180 { \ 181 return show_temp(dev, buf, num-1); \ 182 } \ 183 static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL) 184 185 sysfs_temp(1); 186 sysfs_temp(2); 187 sysfs_temp(3); 188 sysfs_temp(4); 189 190 #define device_create_file_temp(client, num) \ 191 device_create_file(&client->dev, &dev_attr_temp##num##_input) 192 193 /* FAN: 1 RPM/bit 194 REG: count of 90kHz pulses / revolution */ 195 static int fan_from_reg(u16 reg) 196 { 197 return 90000 * 60 / reg; 198 } 199 200 /* 0 <= nr <= 3 */ 201 static ssize_t show_fan(struct device *dev, char *buf, int nr) 202 { 203 struct smsc47b397_data *data = smsc47b397_update_device(dev); 204 return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr])); 205 } 206 207 #define sysfs_fan(num) \ 208 static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \ 209 { \ 210 return show_fan(dev, buf, num-1); \ 211 } \ 212 static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL) 213 214 sysfs_fan(1); 215 sysfs_fan(2); 216 sysfs_fan(3); 217 sysfs_fan(4); 218 219 #define device_create_file_fan(client, num) \ 220 device_create_file(&client->dev, &dev_attr_fan##num##_input) 221 222 static int smsc47b397_detect(struct i2c_adapter *adapter, int addr, int kind); 223 224 static int smsc47b397_attach_adapter(struct i2c_adapter *adapter) 225 { 226 if (!(adapter->class & I2C_CLASS_HWMON)) 227 return 0; 228 return i2c_detect(adapter, &addr_data, smsc47b397_detect); 229 } 230 231 static int smsc47b397_detach_client(struct i2c_client *client) 232 { 233 struct smsc47b397_data *data = i2c_get_clientdata(client); 234 int err; 235 236 hwmon_device_unregister(data->class_dev); 237 238 if ((err = i2c_detach_client(client))) { 239 dev_err(&client->dev, "Client deregistration failed, " 240 "client not detached.\n"); 241 return err; 242 } 243 244 release_region(client->addr, SMSC_EXTENT); 245 kfree(data); 246 247 return 0; 248 } 249 250 static struct i2c_driver smsc47b397_driver = { 251 .owner = THIS_MODULE, 252 .name = "smsc47b397", 253 .id = I2C_DRIVERID_SMSC47B397, 254 .flags = I2C_DF_NOTIFY, 255 .attach_adapter = smsc47b397_attach_adapter, 256 .detach_client = smsc47b397_detach_client, 257 }; 258 259 static int smsc47b397_detect(struct i2c_adapter *adapter, int addr, int kind) 260 { 261 struct i2c_client *new_client; 262 struct smsc47b397_data *data; 263 int err = 0; 264 265 if (!i2c_is_isa_adapter(adapter)) { 266 return 0; 267 } 268 269 if (!request_region(addr, SMSC_EXTENT, smsc47b397_driver.name)) { 270 dev_err(&adapter->dev, "Region 0x%x already in use!\n", addr); 271 return -EBUSY; 272 } 273 274 if (!(data = kmalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { 275 err = -ENOMEM; 276 goto error_release; 277 } 278 memset(data, 0x00, sizeof(struct smsc47b397_data)); 279 280 new_client = &data->client; 281 i2c_set_clientdata(new_client, data); 282 new_client->addr = addr; 283 init_MUTEX(&data->lock); 284 new_client->adapter = adapter; 285 new_client->driver = &smsc47b397_driver; 286 new_client->flags = 0; 287 288 strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE); 289 290 init_MUTEX(&data->update_lock); 291 292 if ((err = i2c_attach_client(new_client))) 293 goto error_free; 294 295 data->class_dev = hwmon_device_register(&new_client->dev); 296 if (IS_ERR(data->class_dev)) { 297 err = PTR_ERR(data->class_dev); 298 goto error_detach; 299 } 300 301 device_create_file_temp(new_client, 1); 302 device_create_file_temp(new_client, 2); 303 device_create_file_temp(new_client, 3); 304 device_create_file_temp(new_client, 4); 305 306 device_create_file_fan(new_client, 1); 307 device_create_file_fan(new_client, 2); 308 device_create_file_fan(new_client, 3); 309 device_create_file_fan(new_client, 4); 310 311 return 0; 312 313 error_detach: 314 i2c_detach_client(new_client); 315 error_free: 316 kfree(data); 317 error_release: 318 release_region(addr, SMSC_EXTENT); 319 return err; 320 } 321 322 static int __init smsc47b397_find(unsigned int *addr) 323 { 324 u8 id, rev; 325 326 superio_enter(); 327 id = superio_inb(SUPERIO_REG_DEVID); 328 329 if (id != 0x6f) { 330 superio_exit(); 331 return -ENODEV; 332 } 333 334 rev = superio_inb(SUPERIO_REG_DEVREV); 335 336 superio_select(SUPERIO_REG_LD8); 337 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) 338 | superio_inb(SUPERIO_REG_BASE_LSB); 339 340 printk(KERN_INFO "smsc47b397: found SMSC LPC47B397-NC " 341 "(base address 0x%04x, revision %u)\n", *addr, rev); 342 343 superio_exit(); 344 return 0; 345 } 346 347 static int __init smsc47b397_init(void) 348 { 349 int ret; 350 351 if ((ret = smsc47b397_find(normal_isa))) 352 return ret; 353 354 return i2c_isa_add_driver(&smsc47b397_driver); 355 } 356 357 static void __exit smsc47b397_exit(void) 358 { 359 i2c_isa_del_driver(&smsc47b397_driver); 360 } 361 362 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 363 MODULE_DESCRIPTION("SMSC LPC47B397 driver"); 364 MODULE_LICENSE("GPL"); 365 366 module_init(smsc47b397_init); 367 module_exit(smsc47b397_exit); 368