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 device *hwmon_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 if (reg == 0 || reg == 0xffff) 178 return 0; 179 return 90000 * 60 / reg; 180 } 181 182 static ssize_t show_fan(struct device *dev, struct device_attribute 183 *devattr, char *buf) 184 { 185 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 186 struct smsc47b397_data *data = smsc47b397_update_device(dev); 187 return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index])); 188 } 189 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); 190 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); 191 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2); 192 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3); 193 194 static ssize_t show_name(struct device *dev, struct device_attribute 195 *devattr, char *buf) 196 { 197 struct smsc47b397_data *data = dev_get_drvdata(dev); 198 return sprintf(buf, "%s\n", data->name); 199 } 200 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 201 202 static struct attribute *smsc47b397_attributes[] = { 203 &sensor_dev_attr_temp1_input.dev_attr.attr, 204 &sensor_dev_attr_temp2_input.dev_attr.attr, 205 &sensor_dev_attr_temp3_input.dev_attr.attr, 206 &sensor_dev_attr_temp4_input.dev_attr.attr, 207 &sensor_dev_attr_fan1_input.dev_attr.attr, 208 &sensor_dev_attr_fan2_input.dev_attr.attr, 209 &sensor_dev_attr_fan3_input.dev_attr.attr, 210 &sensor_dev_attr_fan4_input.dev_attr.attr, 211 212 &dev_attr_name.attr, 213 NULL 214 }; 215 216 static const struct attribute_group smsc47b397_group = { 217 .attrs = smsc47b397_attributes, 218 }; 219 220 static int __devexit smsc47b397_remove(struct platform_device *pdev) 221 { 222 struct smsc47b397_data *data = platform_get_drvdata(pdev); 223 struct resource *res; 224 225 hwmon_device_unregister(data->hwmon_dev); 226 sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group); 227 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 228 release_region(res->start, SMSC_EXTENT); 229 kfree(data); 230 231 return 0; 232 } 233 234 static int smsc47b397_probe(struct platform_device *pdev); 235 236 static struct platform_driver smsc47b397_driver = { 237 .driver = { 238 .owner = THIS_MODULE, 239 .name = DRVNAME, 240 }, 241 .probe = smsc47b397_probe, 242 .remove = __devexit_p(smsc47b397_remove), 243 }; 244 245 static int __devinit smsc47b397_probe(struct platform_device *pdev) 246 { 247 struct device *dev = &pdev->dev; 248 struct smsc47b397_data *data; 249 struct resource *res; 250 int err = 0; 251 252 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 253 if (!request_region(res->start, SMSC_EXTENT, 254 smsc47b397_driver.driver.name)) { 255 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n", 256 (unsigned long)res->start, 257 (unsigned long)res->start + SMSC_EXTENT - 1); 258 return -EBUSY; 259 } 260 261 if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { 262 err = -ENOMEM; 263 goto error_release; 264 } 265 266 data->addr = res->start; 267 data->name = "smsc47b397"; 268 mutex_init(&data->lock); 269 mutex_init(&data->update_lock); 270 platform_set_drvdata(pdev, data); 271 272 if ((err = sysfs_create_group(&dev->kobj, &smsc47b397_group))) 273 goto error_free; 274 275 data->hwmon_dev = hwmon_device_register(dev); 276 if (IS_ERR(data->hwmon_dev)) { 277 err = PTR_ERR(data->hwmon_dev); 278 goto error_remove; 279 } 280 281 return 0; 282 283 error_remove: 284 sysfs_remove_group(&dev->kobj, &smsc47b397_group); 285 error_free: 286 kfree(data); 287 error_release: 288 release_region(res->start, SMSC_EXTENT); 289 return err; 290 } 291 292 static int __init smsc47b397_device_add(unsigned short address) 293 { 294 struct resource res = { 295 .start = address, 296 .end = address + SMSC_EXTENT - 1, 297 .name = DRVNAME, 298 .flags = IORESOURCE_IO, 299 }; 300 int err; 301 302 pdev = platform_device_alloc(DRVNAME, address); 303 if (!pdev) { 304 err = -ENOMEM; 305 printk(KERN_ERR DRVNAME ": Device allocation failed\n"); 306 goto exit; 307 } 308 309 err = platform_device_add_resources(pdev, &res, 1); 310 if (err) { 311 printk(KERN_ERR DRVNAME ": Device resource addition failed " 312 "(%d)\n", err); 313 goto exit_device_put; 314 } 315 316 err = platform_device_add(pdev); 317 if (err) { 318 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", 319 err); 320 goto exit_device_put; 321 } 322 323 return 0; 324 325 exit_device_put: 326 platform_device_put(pdev); 327 exit: 328 return err; 329 } 330 331 static int __init smsc47b397_find(unsigned short *addr) 332 { 333 u8 id, rev; 334 335 superio_enter(); 336 id = superio_inb(SUPERIO_REG_DEVID); 337 338 if ((id != 0x6f) && (id != 0x81) && (id != 0x85)) { 339 superio_exit(); 340 return -ENODEV; 341 } 342 343 rev = superio_inb(SUPERIO_REG_DEVREV); 344 345 superio_select(SUPERIO_REG_LD8); 346 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) 347 | superio_inb(SUPERIO_REG_BASE_LSB); 348 349 printk(KERN_INFO DRVNAME ": found SMSC %s " 350 "(base address 0x%04x, revision %u)\n", 351 id == 0x81 ? "SCH5307-NS" : id == 0x85 ? "SCH5317" : 352 "LPC47B397-NC", *addr, rev); 353 354 superio_exit(); 355 return 0; 356 } 357 358 static int __init smsc47b397_init(void) 359 { 360 unsigned short address; 361 int ret; 362 363 if ((ret = smsc47b397_find(&address))) 364 return ret; 365 366 ret = platform_driver_register(&smsc47b397_driver); 367 if (ret) 368 goto exit; 369 370 /* Sets global pdev as a side effect */ 371 ret = smsc47b397_device_add(address); 372 if (ret) 373 goto exit_driver; 374 375 return 0; 376 377 exit_driver: 378 platform_driver_unregister(&smsc47b397_driver); 379 exit: 380 return ret; 381 } 382 383 static void __exit smsc47b397_exit(void) 384 { 385 platform_device_unregister(pdev); 386 platform_driver_unregister(&smsc47b397_driver); 387 } 388 389 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 390 MODULE_DESCRIPTION("SMSC LPC47B397 driver"); 391 MODULE_LICENSE("GPL"); 392 393 module_init(smsc47b397_init); 394 module_exit(smsc47b397_exit); 395