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 .driver = { 230 .name = "smsc47b397", 231 }, 232 .attach_adapter = smsc47b397_detect, 233 .detach_client = smsc47b397_detach_client, 234 }; 235 236 static int smsc47b397_detect(struct i2c_adapter *adapter) 237 { 238 struct i2c_client *new_client; 239 struct smsc47b397_data *data; 240 int err = 0; 241 242 if (!request_region(address, SMSC_EXTENT, 243 smsc47b397_driver.driver.name)) { 244 dev_err(&adapter->dev, "Region 0x%x already in use!\n", 245 address); 246 return -EBUSY; 247 } 248 249 if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { 250 err = -ENOMEM; 251 goto error_release; 252 } 253 254 new_client = &data->client; 255 i2c_set_clientdata(new_client, data); 256 new_client->addr = address; 257 init_MUTEX(&data->lock); 258 new_client->adapter = adapter; 259 new_client->driver = &smsc47b397_driver; 260 new_client->flags = 0; 261 262 strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE); 263 264 init_MUTEX(&data->update_lock); 265 266 if ((err = i2c_attach_client(new_client))) 267 goto error_free; 268 269 data->class_dev = hwmon_device_register(&new_client->dev); 270 if (IS_ERR(data->class_dev)) { 271 err = PTR_ERR(data->class_dev); 272 goto error_detach; 273 } 274 275 device_create_file_temp(new_client, 1); 276 device_create_file_temp(new_client, 2); 277 device_create_file_temp(new_client, 3); 278 device_create_file_temp(new_client, 4); 279 280 device_create_file_fan(new_client, 1); 281 device_create_file_fan(new_client, 2); 282 device_create_file_fan(new_client, 3); 283 device_create_file_fan(new_client, 4); 284 285 return 0; 286 287 error_detach: 288 i2c_detach_client(new_client); 289 error_free: 290 kfree(data); 291 error_release: 292 release_region(address, SMSC_EXTENT); 293 return err; 294 } 295 296 static int __init smsc47b397_find(unsigned short *addr) 297 { 298 u8 id, rev; 299 300 superio_enter(); 301 id = superio_inb(SUPERIO_REG_DEVID); 302 303 if ((id != 0x6f) && (id != 0x81)) { 304 superio_exit(); 305 return -ENODEV; 306 } 307 308 rev = superio_inb(SUPERIO_REG_DEVREV); 309 310 superio_select(SUPERIO_REG_LD8); 311 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) 312 | superio_inb(SUPERIO_REG_BASE_LSB); 313 314 printk(KERN_INFO "smsc47b397: found SMSC %s " 315 "(base address 0x%04x, revision %u)\n", 316 id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev); 317 318 superio_exit(); 319 return 0; 320 } 321 322 static int __init smsc47b397_init(void) 323 { 324 int ret; 325 326 if ((ret = smsc47b397_find(&address))) 327 return ret; 328 329 return i2c_isa_add_driver(&smsc47b397_driver); 330 } 331 332 static void __exit smsc47b397_exit(void) 333 { 334 i2c_isa_del_driver(&smsc47b397_driver); 335 } 336 337 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 338 MODULE_DESCRIPTION("SMSC LPC47B397 driver"); 339 MODULE_LICENSE("GPL"); 340 341 module_init(smsc47b397_init); 342 module_exit(smsc47b397_exit); 343