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-sensor.h> 35 #include <linux/init.h> 36 #include <asm/io.h> 37 38 static unsigned short normal_i2c[] = { I2C_CLIENT_END }; 39 /* Address is autodetected, there is no default value */ 40 static unsigned int normal_isa[] = { 0x0000, I2C_CLIENT_ISA_END }; 41 static struct i2c_force_data forces[] = {{NULL}}; 42 43 enum chips { any_chip, smsc47b397 }; 44 static struct i2c_address_data addr_data = { 45 .normal_i2c = normal_i2c, 46 .normal_isa = normal_isa, 47 .probe = normal_i2c, /* cheat */ 48 .ignore = normal_i2c, /* cheat */ 49 .forces = forces, 50 }; 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 struct i2c_client client; 103 struct semaphore lock; 104 105 struct semaphore update_lock; 106 unsigned long last_updated; /* in jiffies */ 107 int valid; 108 109 /* register values */ 110 u16 fan[4]; 111 u8 temp[4]; 112 }; 113 114 static int smsc47b397_read_value(struct i2c_client *client, u8 reg) 115 { 116 struct smsc47b397_data *data = i2c_get_clientdata(client); 117 int res; 118 119 down(&data->lock); 120 outb(reg, client->addr); 121 res = inb_p(client->addr + 1); 122 up(&data->lock); 123 return res; 124 } 125 126 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) 127 { 128 struct i2c_client *client = to_i2c_client(dev); 129 struct smsc47b397_data *data = i2c_get_clientdata(client); 130 int i; 131 132 down(&data->update_lock); 133 134 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 135 dev_dbg(&client->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(client, 140 SMSC47B397_REG_TEMP(i)); 141 142 /* must read LSB first */ 143 data->fan[i] = smsc47b397_read_value(client, 144 SMSC47B397_REG_FAN_LSB(i)); 145 data->fan[i] |= smsc47b397_read_value(client, 146 SMSC47B397_REG_FAN_MSB(i)) << 8; 147 } 148 149 data->last_updated = jiffies; 150 data->valid = 1; 151 152 dev_dbg(&client->dev, "... device update complete\n"); 153 } 154 155 up(&data->update_lock); 156 157 return data; 158 } 159 160 /* TEMP: 0.001C/bit (-128C to +127C) 161 REG: 1C/bit, two's complement */ 162 static int temp_from_reg(u8 reg) 163 { 164 return (s8)reg * 1000; 165 } 166 167 /* 0 <= nr <= 3 */ 168 static ssize_t show_temp(struct device *dev, char *buf, int nr) 169 { 170 struct smsc47b397_data *data = smsc47b397_update_device(dev); 171 return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr])); 172 } 173 174 #define sysfs_temp(num) \ 175 static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \ 176 { \ 177 return show_temp(dev, buf, num-1); \ 178 } \ 179 static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL) 180 181 sysfs_temp(1); 182 sysfs_temp(2); 183 sysfs_temp(3); 184 sysfs_temp(4); 185 186 #define device_create_file_temp(client, num) \ 187 device_create_file(&client->dev, &dev_attr_temp##num##_input) 188 189 /* FAN: 1 RPM/bit 190 REG: count of 90kHz pulses / revolution */ 191 static int fan_from_reg(u16 reg) 192 { 193 return 90000 * 60 / reg; 194 } 195 196 /* 0 <= nr <= 3 */ 197 static ssize_t show_fan(struct device *dev, char *buf, int nr) 198 { 199 struct smsc47b397_data *data = smsc47b397_update_device(dev); 200 return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr])); 201 } 202 203 #define sysfs_fan(num) \ 204 static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \ 205 { \ 206 return show_fan(dev, buf, num-1); \ 207 } \ 208 static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL) 209 210 sysfs_fan(1); 211 sysfs_fan(2); 212 sysfs_fan(3); 213 sysfs_fan(4); 214 215 #define device_create_file_fan(client, num) \ 216 device_create_file(&client->dev, &dev_attr_fan##num##_input) 217 218 static int smsc47b397_detect(struct i2c_adapter *adapter, int addr, int kind); 219 220 static int smsc47b397_attach_adapter(struct i2c_adapter *adapter) 221 { 222 if (!(adapter->class & I2C_CLASS_HWMON)) 223 return 0; 224 return i2c_detect(adapter, &addr_data, smsc47b397_detect); 225 } 226 227 static int smsc47b397_detach_client(struct i2c_client *client) 228 { 229 int err; 230 231 if ((err = i2c_detach_client(client))) { 232 dev_err(&client->dev, "Client deregistration failed, " 233 "client not detached.\n"); 234 return err; 235 } 236 237 release_region(client->addr, SMSC_EXTENT); 238 kfree(i2c_get_clientdata(client)); 239 240 return 0; 241 } 242 243 static struct i2c_driver smsc47b397_driver = { 244 .owner = THIS_MODULE, 245 .name = "smsc47b397", 246 .id = I2C_DRIVERID_SMSC47B397, 247 .flags = I2C_DF_NOTIFY, 248 .attach_adapter = smsc47b397_attach_adapter, 249 .detach_client = smsc47b397_detach_client, 250 }; 251 252 static int smsc47b397_detect(struct i2c_adapter *adapter, int addr, int kind) 253 { 254 struct i2c_client *new_client; 255 struct smsc47b397_data *data; 256 int err = 0; 257 258 if (!i2c_is_isa_adapter(adapter)) { 259 return 0; 260 } 261 262 if (!request_region(addr, SMSC_EXTENT, smsc47b397_driver.name)) { 263 dev_err(&adapter->dev, "Region 0x%x already in use!\n", addr); 264 return -EBUSY; 265 } 266 267 if (!(data = kmalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { 268 err = -ENOMEM; 269 goto error_release; 270 } 271 memset(data, 0x00, sizeof(struct smsc47b397_data)); 272 273 new_client = &data->client; 274 i2c_set_clientdata(new_client, data); 275 new_client->addr = addr; 276 init_MUTEX(&data->lock); 277 new_client->adapter = adapter; 278 new_client->driver = &smsc47b397_driver; 279 new_client->flags = 0; 280 281 strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE); 282 283 init_MUTEX(&data->update_lock); 284 285 if ((err = i2c_attach_client(new_client))) 286 goto error_free; 287 288 device_create_file_temp(new_client, 1); 289 device_create_file_temp(new_client, 2); 290 device_create_file_temp(new_client, 3); 291 device_create_file_temp(new_client, 4); 292 293 device_create_file_fan(new_client, 1); 294 device_create_file_fan(new_client, 2); 295 device_create_file_fan(new_client, 3); 296 device_create_file_fan(new_client, 4); 297 298 return 0; 299 300 error_free: 301 kfree(data); 302 error_release: 303 release_region(addr, SMSC_EXTENT); 304 return err; 305 } 306 307 static int __init smsc47b397_find(unsigned int *addr) 308 { 309 u8 id, rev; 310 311 superio_enter(); 312 id = superio_inb(SUPERIO_REG_DEVID); 313 314 if (id != 0x6f) { 315 superio_exit(); 316 return -ENODEV; 317 } 318 319 rev = superio_inb(SUPERIO_REG_DEVREV); 320 321 superio_select(SUPERIO_REG_LD8); 322 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) 323 | superio_inb(SUPERIO_REG_BASE_LSB); 324 325 printk(KERN_INFO "smsc47b397: found SMSC LPC47B397-NC " 326 "(base address 0x%04x, revision %u)\n", *addr, rev); 327 328 superio_exit(); 329 return 0; 330 } 331 332 static int __init smsc47b397_init(void) 333 { 334 int ret; 335 336 if ((ret = smsc47b397_find(normal_isa))) 337 return ret; 338 339 return i2c_add_driver(&smsc47b397_driver); 340 } 341 342 static void __exit smsc47b397_exit(void) 343 { 344 i2c_del_driver(&smsc47b397_driver); 345 } 346 347 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 348 MODULE_DESCRIPTION("SMSC LPC47B397 driver"); 349 MODULE_LICENSE("GPL"); 350 351 module_init(smsc47b397_init); 352 module_exit(smsc47b397_exit); 353