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 unsigned short force_id; 42 module_param(force_id, ushort, 0); 43 MODULE_PARM_DESC(force_id, "Override the detected device ID"); 44 45 static struct platform_device *pdev; 46 47 #define DRVNAME "smsc47b397" 48 49 /* Super-I/0 registers and commands */ 50 51 #define REG 0x2e /* The register to read/write */ 52 #define VAL 0x2f /* The value to read/write */ 53 54 static inline void superio_outb(int reg, int val) 55 { 56 outb(reg, REG); 57 outb(val, VAL); 58 } 59 60 static inline int superio_inb(int reg) 61 { 62 outb(reg, REG); 63 return inb(VAL); 64 } 65 66 /* select superio logical device */ 67 static inline void superio_select(int ld) 68 { 69 superio_outb(0x07, ld); 70 } 71 72 static inline void superio_enter(void) 73 { 74 outb(0x55, REG); 75 } 76 77 static inline void superio_exit(void) 78 { 79 outb(0xAA, REG); 80 } 81 82 #define SUPERIO_REG_DEVID 0x20 83 #define SUPERIO_REG_DEVREV 0x21 84 #define SUPERIO_REG_BASE_MSB 0x60 85 #define SUPERIO_REG_BASE_LSB 0x61 86 #define SUPERIO_REG_LD8 0x08 87 88 #define SMSC_EXTENT 0x02 89 90 /* 0 <= nr <= 3 */ 91 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80}; 92 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)]) 93 94 /* 0 <= nr <= 3 */ 95 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr)) 96 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr)) 97 98 struct smsc47b397_data { 99 unsigned short addr; 100 const char *name; 101 struct device *hwmon_dev; 102 struct mutex lock; 103 104 struct mutex update_lock; 105 unsigned long last_updated; /* in jiffies */ 106 int valid; 107 108 /* register values */ 109 u16 fan[4]; 110 u8 temp[4]; 111 }; 112 113 static int smsc47b397_read_value(struct smsc47b397_data* data, u8 reg) 114 { 115 int res; 116 117 mutex_lock(&data->lock); 118 outb(reg, data->addr); 119 res = inb_p(data->addr + 1); 120 mutex_unlock(&data->lock); 121 return res; 122 } 123 124 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) 125 { 126 struct smsc47b397_data *data = dev_get_drvdata(dev); 127 int i; 128 129 mutex_lock(&data->update_lock); 130 131 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 132 dev_dbg(dev, "starting device update...\n"); 133 134 /* 4 temperature inputs, 4 fan inputs */ 135 for (i = 0; i < 4; i++) { 136 data->temp[i] = smsc47b397_read_value(data, 137 SMSC47B397_REG_TEMP(i)); 138 139 /* must read LSB first */ 140 data->fan[i] = smsc47b397_read_value(data, 141 SMSC47B397_REG_FAN_LSB(i)); 142 data->fan[i] |= smsc47b397_read_value(data, 143 SMSC47B397_REG_FAN_MSB(i)) << 8; 144 } 145 146 data->last_updated = jiffies; 147 data->valid = 1; 148 149 dev_dbg(dev, "... device update complete\n"); 150 } 151 152 mutex_unlock(&data->update_lock); 153 154 return data; 155 } 156 157 /* TEMP: 0.001C/bit (-128C to +127C) 158 REG: 1C/bit, two's complement */ 159 static int temp_from_reg(u8 reg) 160 { 161 return (s8)reg * 1000; 162 } 163 164 static ssize_t show_temp(struct device *dev, struct device_attribute 165 *devattr, char *buf) 166 { 167 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 168 struct smsc47b397_data *data = smsc47b397_update_device(dev); 169 return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index])); 170 } 171 172 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); 173 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); 174 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); 175 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); 176 177 /* FAN: 1 RPM/bit 178 REG: count of 90kHz pulses / revolution */ 179 static int fan_from_reg(u16 reg) 180 { 181 if (reg == 0 || reg == 0xffff) 182 return 0; 183 return 90000 * 60 / reg; 184 } 185 186 static ssize_t show_fan(struct device *dev, struct device_attribute 187 *devattr, char *buf) 188 { 189 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 190 struct smsc47b397_data *data = smsc47b397_update_device(dev); 191 return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index])); 192 } 193 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); 194 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); 195 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2); 196 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3); 197 198 static ssize_t show_name(struct device *dev, struct device_attribute 199 *devattr, char *buf) 200 { 201 struct smsc47b397_data *data = dev_get_drvdata(dev); 202 return sprintf(buf, "%s\n", data->name); 203 } 204 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 205 206 static struct attribute *smsc47b397_attributes[] = { 207 &sensor_dev_attr_temp1_input.dev_attr.attr, 208 &sensor_dev_attr_temp2_input.dev_attr.attr, 209 &sensor_dev_attr_temp3_input.dev_attr.attr, 210 &sensor_dev_attr_temp4_input.dev_attr.attr, 211 &sensor_dev_attr_fan1_input.dev_attr.attr, 212 &sensor_dev_attr_fan2_input.dev_attr.attr, 213 &sensor_dev_attr_fan3_input.dev_attr.attr, 214 &sensor_dev_attr_fan4_input.dev_attr.attr, 215 216 &dev_attr_name.attr, 217 NULL 218 }; 219 220 static const struct attribute_group smsc47b397_group = { 221 .attrs = smsc47b397_attributes, 222 }; 223 224 static int __devexit smsc47b397_remove(struct platform_device *pdev) 225 { 226 struct smsc47b397_data *data = platform_get_drvdata(pdev); 227 struct resource *res; 228 229 hwmon_device_unregister(data->hwmon_dev); 230 sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group); 231 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 232 release_region(res->start, SMSC_EXTENT); 233 kfree(data); 234 235 return 0; 236 } 237 238 static int smsc47b397_probe(struct platform_device *pdev); 239 240 static struct platform_driver smsc47b397_driver = { 241 .driver = { 242 .owner = THIS_MODULE, 243 .name = DRVNAME, 244 }, 245 .probe = smsc47b397_probe, 246 .remove = __devexit_p(smsc47b397_remove), 247 }; 248 249 static int __devinit smsc47b397_probe(struct platform_device *pdev) 250 { 251 struct device *dev = &pdev->dev; 252 struct smsc47b397_data *data; 253 struct resource *res; 254 int err = 0; 255 256 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 257 if (!request_region(res->start, SMSC_EXTENT, 258 smsc47b397_driver.driver.name)) { 259 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n", 260 (unsigned long)res->start, 261 (unsigned long)res->start + SMSC_EXTENT - 1); 262 return -EBUSY; 263 } 264 265 if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { 266 err = -ENOMEM; 267 goto error_release; 268 } 269 270 data->addr = res->start; 271 data->name = "smsc47b397"; 272 mutex_init(&data->lock); 273 mutex_init(&data->update_lock); 274 platform_set_drvdata(pdev, data); 275 276 if ((err = sysfs_create_group(&dev->kobj, &smsc47b397_group))) 277 goto error_free; 278 279 data->hwmon_dev = hwmon_device_register(dev); 280 if (IS_ERR(data->hwmon_dev)) { 281 err = PTR_ERR(data->hwmon_dev); 282 goto error_remove; 283 } 284 285 return 0; 286 287 error_remove: 288 sysfs_remove_group(&dev->kobj, &smsc47b397_group); 289 error_free: 290 kfree(data); 291 error_release: 292 release_region(res->start, SMSC_EXTENT); 293 return err; 294 } 295 296 static int __init smsc47b397_device_add(unsigned short address) 297 { 298 struct resource res = { 299 .start = address, 300 .end = address + SMSC_EXTENT - 1, 301 .name = DRVNAME, 302 .flags = IORESOURCE_IO, 303 }; 304 int err; 305 306 pdev = platform_device_alloc(DRVNAME, address); 307 if (!pdev) { 308 err = -ENOMEM; 309 printk(KERN_ERR DRVNAME ": Device allocation failed\n"); 310 goto exit; 311 } 312 313 err = platform_device_add_resources(pdev, &res, 1); 314 if (err) { 315 printk(KERN_ERR DRVNAME ": Device resource addition failed " 316 "(%d)\n", err); 317 goto exit_device_put; 318 } 319 320 err = platform_device_add(pdev); 321 if (err) { 322 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", 323 err); 324 goto exit_device_put; 325 } 326 327 return 0; 328 329 exit_device_put: 330 platform_device_put(pdev); 331 exit: 332 return err; 333 } 334 335 static int __init smsc47b397_find(unsigned short *addr) 336 { 337 u8 id, rev; 338 339 superio_enter(); 340 id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID); 341 342 if ((id != 0x6f) && (id != 0x81) && (id != 0x85)) { 343 superio_exit(); 344 return -ENODEV; 345 } 346 347 rev = superio_inb(SUPERIO_REG_DEVREV); 348 349 superio_select(SUPERIO_REG_LD8); 350 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) 351 | superio_inb(SUPERIO_REG_BASE_LSB); 352 353 printk(KERN_INFO DRVNAME ": found SMSC %s " 354 "(base address 0x%04x, revision %u)\n", 355 id == 0x81 ? "SCH5307-NS" : id == 0x85 ? "SCH5317" : 356 "LPC47B397-NC", *addr, rev); 357 358 superio_exit(); 359 return 0; 360 } 361 362 static int __init smsc47b397_init(void) 363 { 364 unsigned short address; 365 int ret; 366 367 if ((ret = smsc47b397_find(&address))) 368 return ret; 369 370 ret = platform_driver_register(&smsc47b397_driver); 371 if (ret) 372 goto exit; 373 374 /* Sets global pdev as a side effect */ 375 ret = smsc47b397_device_add(address); 376 if (ret) 377 goto exit_driver; 378 379 return 0; 380 381 exit_driver: 382 platform_driver_unregister(&smsc47b397_driver); 383 exit: 384 return ret; 385 } 386 387 static void __exit smsc47b397_exit(void) 388 { 389 platform_device_unregister(pdev); 390 platform_driver_unregister(&smsc47b397_driver); 391 } 392 393 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 394 MODULE_DESCRIPTION("SMSC LPC47B397 driver"); 395 MODULE_LICENSE("GPL"); 396 397 module_init(smsc47b397_init); 398 module_exit(smsc47b397_exit); 399