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/platform_device.h> 34 #include <linux/hwmon.h> 35 #include <linux/hwmon-sysfs.h> 36 #include <linux/err.h> 37 #include <linux/init.h> 38 #include <linux/mutex.h> 39 #include <asm/io.h> 40 41 static struct platform_device *pdev; 42 43 #define DRVNAME "smsc47b397" 44 45 /* Super-I/0 registers and commands */ 46 47 #define REG 0x2e /* The register to read/write */ 48 #define VAL 0x2f /* The value to read/write */ 49 50 static inline void superio_outb(int reg, int val) 51 { 52 outb(reg, REG); 53 outb(val, VAL); 54 } 55 56 static inline int superio_inb(int reg) 57 { 58 outb(reg, REG); 59 return inb(VAL); 60 } 61 62 /* select superio logical device */ 63 static inline void superio_select(int ld) 64 { 65 superio_outb(0x07, ld); 66 } 67 68 static inline void superio_enter(void) 69 { 70 outb(0x55, REG); 71 } 72 73 static inline void superio_exit(void) 74 { 75 outb(0xAA, REG); 76 } 77 78 #define SUPERIO_REG_DEVID 0x20 79 #define SUPERIO_REG_DEVREV 0x21 80 #define SUPERIO_REG_BASE_MSB 0x60 81 #define SUPERIO_REG_BASE_LSB 0x61 82 #define SUPERIO_REG_LD8 0x08 83 84 #define SMSC_EXTENT 0x02 85 86 /* 0 <= nr <= 3 */ 87 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80}; 88 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)]) 89 90 /* 0 <= nr <= 3 */ 91 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr)) 92 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr)) 93 94 struct smsc47b397_data { 95 unsigned short addr; 96 const char *name; 97 struct class_device *class_dev; 98 struct mutex lock; 99 100 struct mutex update_lock; 101 unsigned long last_updated; /* in jiffies */ 102 int valid; 103 104 /* register values */ 105 u16 fan[4]; 106 u8 temp[4]; 107 }; 108 109 static int smsc47b397_read_value(struct smsc47b397_data* data, u8 reg) 110 { 111 int res; 112 113 mutex_lock(&data->lock); 114 outb(reg, data->addr); 115 res = inb_p(data->addr + 1); 116 mutex_unlock(&data->lock); 117 return res; 118 } 119 120 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) 121 { 122 struct smsc47b397_data *data = dev_get_drvdata(dev); 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(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(data, 133 SMSC47B397_REG_TEMP(i)); 134 135 /* must read LSB first */ 136 data->fan[i] = smsc47b397_read_value(data, 137 SMSC47B397_REG_FAN_LSB(i)); 138 data->fan[i] |= smsc47b397_read_value(data, 139 SMSC47B397_REG_FAN_MSB(i)) << 8; 140 } 141 142 data->last_updated = jiffies; 143 data->valid = 1; 144 145 dev_dbg(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 static ssize_t show_temp(struct device *dev, struct device_attribute 161 *devattr, char *buf) 162 { 163 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 164 struct smsc47b397_data *data = smsc47b397_update_device(dev); 165 return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index])); 166 } 167 168 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); 169 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); 170 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); 171 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); 172 173 /* FAN: 1 RPM/bit 174 REG: count of 90kHz pulses / revolution */ 175 static int fan_from_reg(u16 reg) 176 { 177 return 90000 * 60 / reg; 178 } 179 180 static ssize_t show_fan(struct device *dev, struct device_attribute 181 *devattr, char *buf) 182 { 183 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 184 struct smsc47b397_data *data = smsc47b397_update_device(dev); 185 return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index])); 186 } 187 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); 188 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); 189 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2); 190 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3); 191 192 static ssize_t show_name(struct device *dev, struct device_attribute 193 *devattr, char *buf) 194 { 195 struct smsc47b397_data *data = dev_get_drvdata(dev); 196 return sprintf(buf, "%s\n", data->name); 197 } 198 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 199 200 static struct attribute *smsc47b397_attributes[] = { 201 &sensor_dev_attr_temp1_input.dev_attr.attr, 202 &sensor_dev_attr_temp2_input.dev_attr.attr, 203 &sensor_dev_attr_temp3_input.dev_attr.attr, 204 &sensor_dev_attr_temp4_input.dev_attr.attr, 205 &sensor_dev_attr_fan1_input.dev_attr.attr, 206 &sensor_dev_attr_fan2_input.dev_attr.attr, 207 &sensor_dev_attr_fan3_input.dev_attr.attr, 208 &sensor_dev_attr_fan4_input.dev_attr.attr, 209 210 &dev_attr_name.attr, 211 NULL 212 }; 213 214 static const struct attribute_group smsc47b397_group = { 215 .attrs = smsc47b397_attributes, 216 }; 217 218 static int __devexit smsc47b397_remove(struct platform_device *pdev) 219 { 220 struct smsc47b397_data *data = platform_get_drvdata(pdev); 221 struct resource *res; 222 223 hwmon_device_unregister(data->class_dev); 224 sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group); 225 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 226 release_region(res->start, SMSC_EXTENT); 227 kfree(data); 228 229 return 0; 230 } 231 232 static int smsc47b397_probe(struct platform_device *pdev); 233 234 static struct platform_driver smsc47b397_driver = { 235 .driver = { 236 .owner = THIS_MODULE, 237 .name = DRVNAME, 238 }, 239 .probe = smsc47b397_probe, 240 .remove = __devexit_p(smsc47b397_remove), 241 }; 242 243 static int __devinit smsc47b397_probe(struct platform_device *pdev) 244 { 245 struct device *dev = &pdev->dev; 246 struct smsc47b397_data *data; 247 struct resource *res; 248 int err = 0; 249 250 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 251 if (!request_region(res->start, SMSC_EXTENT, 252 smsc47b397_driver.driver.name)) { 253 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n", 254 (unsigned long)res->start, 255 (unsigned long)res->start + SMSC_EXTENT - 1); 256 return -EBUSY; 257 } 258 259 if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { 260 err = -ENOMEM; 261 goto error_release; 262 } 263 264 data->addr = res->start; 265 data->name = "smsc47b397"; 266 mutex_init(&data->lock); 267 mutex_init(&data->update_lock); 268 platform_set_drvdata(pdev, data); 269 270 if ((err = sysfs_create_group(&dev->kobj, &smsc47b397_group))) 271 goto error_free; 272 273 data->class_dev = hwmon_device_register(dev); 274 if (IS_ERR(data->class_dev)) { 275 err = PTR_ERR(data->class_dev); 276 goto error_remove; 277 } 278 279 return 0; 280 281 error_remove: 282 sysfs_remove_group(&dev->kobj, &smsc47b397_group); 283 error_free: 284 kfree(data); 285 error_release: 286 release_region(res->start, SMSC_EXTENT); 287 return err; 288 } 289 290 static int __init smsc47b397_device_add(unsigned short address) 291 { 292 struct resource res = { 293 .start = address, 294 .end = address + SMSC_EXTENT - 1, 295 .name = DRVNAME, 296 .flags = IORESOURCE_IO, 297 }; 298 int err; 299 300 pdev = platform_device_alloc(DRVNAME, address); 301 if (!pdev) { 302 err = -ENOMEM; 303 printk(KERN_ERR DRVNAME ": Device allocation failed\n"); 304 goto exit; 305 } 306 307 err = platform_device_add_resources(pdev, &res, 1); 308 if (err) { 309 printk(KERN_ERR DRVNAME ": Device resource addition failed " 310 "(%d)\n", err); 311 goto exit_device_put; 312 } 313 314 err = platform_device_add(pdev); 315 if (err) { 316 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", 317 err); 318 goto exit_device_put; 319 } 320 321 return 0; 322 323 exit_device_put: 324 platform_device_put(pdev); 325 exit: 326 return err; 327 } 328 329 static int __init smsc47b397_find(unsigned short *addr) 330 { 331 u8 id, rev; 332 333 superio_enter(); 334 id = superio_inb(SUPERIO_REG_DEVID); 335 336 if ((id != 0x6f) && (id != 0x81)) { 337 superio_exit(); 338 return -ENODEV; 339 } 340 341 rev = superio_inb(SUPERIO_REG_DEVREV); 342 343 superio_select(SUPERIO_REG_LD8); 344 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) 345 | superio_inb(SUPERIO_REG_BASE_LSB); 346 347 printk(KERN_INFO DRVNAME ": found SMSC %s " 348 "(base address 0x%04x, revision %u)\n", 349 id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev); 350 351 superio_exit(); 352 return 0; 353 } 354 355 static int __init smsc47b397_init(void) 356 { 357 unsigned short address; 358 int ret; 359 360 if ((ret = smsc47b397_find(&address))) 361 return ret; 362 363 ret = platform_driver_register(&smsc47b397_driver); 364 if (ret) 365 goto exit; 366 367 /* Sets global pdev as a side effect */ 368 ret = smsc47b397_device_add(address); 369 if (ret) 370 goto exit_driver; 371 372 return 0; 373 374 exit_driver: 375 platform_driver_unregister(&smsc47b397_driver); 376 exit: 377 return ret; 378 } 379 380 static void __exit smsc47b397_exit(void) 381 { 382 platform_device_unregister(pdev); 383 platform_driver_unregister(&smsc47b397_driver); 384 } 385 386 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 387 MODULE_DESCRIPTION("SMSC LPC47B397 driver"); 388 MODULE_LICENSE("GPL"); 389 390 module_init(smsc47b397_init); 391 module_exit(smsc47b397_exit); 392