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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 30 31 #include <linux/module.h> 32 #include <linux/slab.h> 33 #include <linux/ioport.h> 34 #include <linux/jiffies.h> 35 #include <linux/platform_device.h> 36 #include <linux/hwmon.h> 37 #include <linux/hwmon-sysfs.h> 38 #include <linux/err.h> 39 #include <linux/init.h> 40 #include <linux/mutex.h> 41 #include <linux/acpi.h> 42 #include <linux/io.h> 43 44 static unsigned short force_id; 45 module_param(force_id, ushort, 0); 46 MODULE_PARM_DESC(force_id, "Override the detected device ID"); 47 48 static struct platform_device *pdev; 49 50 #define DRVNAME "smsc47b397" 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 unsigned short addr; 103 const char *name; 104 struct device *hwmon_dev; 105 struct mutex lock; 106 107 struct mutex update_lock; 108 unsigned long last_updated; /* in jiffies */ 109 int valid; 110 111 /* register values */ 112 u16 fan[4]; 113 u8 temp[4]; 114 }; 115 116 static int smsc47b397_read_value(struct smsc47b397_data *data, u8 reg) 117 { 118 int res; 119 120 mutex_lock(&data->lock); 121 outb(reg, data->addr); 122 res = inb_p(data->addr + 1); 123 mutex_unlock(&data->lock); 124 return res; 125 } 126 127 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) 128 { 129 struct smsc47b397_data *data = dev_get_drvdata(dev); 130 int i; 131 132 mutex_lock(&data->update_lock); 133 134 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 135 dev_dbg(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(data, 140 SMSC47B397_REG_TEMP(i)); 141 142 /* must read LSB first */ 143 data->fan[i] = smsc47b397_read_value(data, 144 SMSC47B397_REG_FAN_LSB(i)); 145 data->fan[i] |= smsc47b397_read_value(data, 146 SMSC47B397_REG_FAN_MSB(i)) << 8; 147 } 148 149 data->last_updated = jiffies; 150 data->valid = 1; 151 152 dev_dbg(dev, "... device update complete\n"); 153 } 154 155 mutex_unlock(&data->update_lock); 156 157 return data; 158 } 159 160 /* 161 * TEMP: 0.001C/bit (-128C to +127C) 162 * REG: 1C/bit, two's complement 163 */ 164 static int temp_from_reg(u8 reg) 165 { 166 return (s8)reg * 1000; 167 } 168 169 static ssize_t show_temp(struct device *dev, struct device_attribute 170 *devattr, char *buf) 171 { 172 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 173 struct smsc47b397_data *data = smsc47b397_update_device(dev); 174 return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index])); 175 } 176 177 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); 178 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); 179 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); 180 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); 181 182 /* 183 * FAN: 1 RPM/bit 184 * REG: count of 90kHz pulses / revolution 185 */ 186 static int fan_from_reg(u16 reg) 187 { 188 if (reg == 0 || reg == 0xffff) 189 return 0; 190 return 90000 * 60 / reg; 191 } 192 193 static ssize_t show_fan(struct device *dev, struct device_attribute 194 *devattr, char *buf) 195 { 196 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 197 struct smsc47b397_data *data = smsc47b397_update_device(dev); 198 return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index])); 199 } 200 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); 201 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); 202 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2); 203 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3); 204 205 static ssize_t show_name(struct device *dev, struct device_attribute 206 *devattr, char *buf) 207 { 208 struct smsc47b397_data *data = dev_get_drvdata(dev); 209 return sprintf(buf, "%s\n", data->name); 210 } 211 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 212 213 static struct attribute *smsc47b397_attributes[] = { 214 &sensor_dev_attr_temp1_input.dev_attr.attr, 215 &sensor_dev_attr_temp2_input.dev_attr.attr, 216 &sensor_dev_attr_temp3_input.dev_attr.attr, 217 &sensor_dev_attr_temp4_input.dev_attr.attr, 218 &sensor_dev_attr_fan1_input.dev_attr.attr, 219 &sensor_dev_attr_fan2_input.dev_attr.attr, 220 &sensor_dev_attr_fan3_input.dev_attr.attr, 221 &sensor_dev_attr_fan4_input.dev_attr.attr, 222 223 &dev_attr_name.attr, 224 NULL 225 }; 226 227 static const struct attribute_group smsc47b397_group = { 228 .attrs = smsc47b397_attributes, 229 }; 230 231 static int __devexit smsc47b397_remove(struct platform_device *pdev) 232 { 233 struct smsc47b397_data *data = platform_get_drvdata(pdev); 234 235 hwmon_device_unregister(data->hwmon_dev); 236 sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group); 237 238 return 0; 239 } 240 241 static int smsc47b397_probe(struct platform_device *pdev); 242 243 static struct platform_driver smsc47b397_driver = { 244 .driver = { 245 .owner = THIS_MODULE, 246 .name = DRVNAME, 247 }, 248 .probe = smsc47b397_probe, 249 .remove = __devexit_p(smsc47b397_remove), 250 }; 251 252 static int __devinit smsc47b397_probe(struct platform_device *pdev) 253 { 254 struct device *dev = &pdev->dev; 255 struct smsc47b397_data *data; 256 struct resource *res; 257 int err = 0; 258 259 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 260 if (!devm_request_region(dev, res->start, SMSC_EXTENT, 261 smsc47b397_driver.driver.name)) { 262 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n", 263 (unsigned long)res->start, 264 (unsigned long)res->start + SMSC_EXTENT - 1); 265 return -EBUSY; 266 } 267 268 data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL); 269 if (!data) 270 return -ENOMEM; 271 272 data->addr = res->start; 273 data->name = "smsc47b397"; 274 mutex_init(&data->lock); 275 mutex_init(&data->update_lock); 276 platform_set_drvdata(pdev, data); 277 278 err = sysfs_create_group(&dev->kobj, &smsc47b397_group); 279 if (err) 280 return err; 281 282 data->hwmon_dev = hwmon_device_register(dev); 283 if (IS_ERR(data->hwmon_dev)) { 284 err = PTR_ERR(data->hwmon_dev); 285 goto error_remove; 286 } 287 288 return 0; 289 290 error_remove: 291 sysfs_remove_group(&dev->kobj, &smsc47b397_group); 292 return err; 293 } 294 295 static int __init smsc47b397_device_add(unsigned short address) 296 { 297 struct resource res = { 298 .start = address, 299 .end = address + SMSC_EXTENT - 1, 300 .name = DRVNAME, 301 .flags = IORESOURCE_IO, 302 }; 303 int err; 304 305 err = acpi_check_resource_conflict(&res); 306 if (err) 307 goto exit; 308 309 pdev = platform_device_alloc(DRVNAME, address); 310 if (!pdev) { 311 err = -ENOMEM; 312 pr_err("Device allocation failed\n"); 313 goto exit; 314 } 315 316 err = platform_device_add_resources(pdev, &res, 1); 317 if (err) { 318 pr_err("Device resource addition failed (%d)\n", err); 319 goto exit_device_put; 320 } 321 322 err = platform_device_add(pdev); 323 if (err) { 324 pr_err("Device addition failed (%d)\n", err); 325 goto exit_device_put; 326 } 327 328 return 0; 329 330 exit_device_put: 331 platform_device_put(pdev); 332 exit: 333 return err; 334 } 335 336 static int __init smsc47b397_find(void) 337 { 338 u8 id, rev; 339 char *name; 340 unsigned short addr; 341 342 superio_enter(); 343 id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID); 344 345 switch (id) { 346 case 0x81: 347 name = "SCH5307-NS"; 348 break; 349 case 0x6f: 350 name = "LPC47B397-NC"; 351 break; 352 case 0x85: 353 case 0x8c: 354 name = "SCH5317"; 355 break; 356 default: 357 superio_exit(); 358 return -ENODEV; 359 } 360 361 rev = superio_inb(SUPERIO_REG_DEVREV); 362 363 superio_select(SUPERIO_REG_LD8); 364 addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) 365 | superio_inb(SUPERIO_REG_BASE_LSB); 366 367 pr_info("found SMSC %s (base address 0x%04x, revision %u)\n", 368 name, addr, rev); 369 370 superio_exit(); 371 return addr; 372 } 373 374 static int __init smsc47b397_init(void) 375 { 376 unsigned short address; 377 int ret; 378 379 ret = smsc47b397_find(); 380 if (ret < 0) 381 return ret; 382 address = ret; 383 384 ret = platform_driver_register(&smsc47b397_driver); 385 if (ret) 386 goto exit; 387 388 /* Sets global pdev as a side effect */ 389 ret = smsc47b397_device_add(address); 390 if (ret) 391 goto exit_driver; 392 393 return 0; 394 395 exit_driver: 396 platform_driver_unregister(&smsc47b397_driver); 397 exit: 398 return ret; 399 } 400 401 static void __exit smsc47b397_exit(void) 402 { 403 platform_device_unregister(pdev); 404 platform_driver_unregister(&smsc47b397_driver); 405 } 406 407 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 408 MODULE_DESCRIPTION("SMSC LPC47B397 driver"); 409 MODULE_LICENSE("GPL"); 410 411 module_init(smsc47b397_init); 412 module_exit(smsc47b397_exit); 413