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 <jdelvare@suse.de> 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 struct mutex lock; 104 105 struct mutex update_lock; 106 unsigned long last_updated; /* in jiffies */ 107 int valid; 108 109 /* register values */ 110 u16 fan[4]; 111 u8 temp[4]; 112 }; 113 114 static int smsc47b397_read_value(struct smsc47b397_data *data, u8 reg) 115 { 116 int res; 117 118 mutex_lock(&data->lock); 119 outb(reg, data->addr); 120 res = inb_p(data->addr + 1); 121 mutex_unlock(&data->lock); 122 return res; 123 } 124 125 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) 126 { 127 struct smsc47b397_data *data = dev_get_drvdata(dev); 128 int i; 129 130 mutex_lock(&data->update_lock); 131 132 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 133 dev_dbg(dev, "starting device update...\n"); 134 135 /* 4 temperature inputs, 4 fan inputs */ 136 for (i = 0; i < 4; i++) { 137 data->temp[i] = smsc47b397_read_value(data, 138 SMSC47B397_REG_TEMP(i)); 139 140 /* must read LSB first */ 141 data->fan[i] = smsc47b397_read_value(data, 142 SMSC47B397_REG_FAN_LSB(i)); 143 data->fan[i] |= smsc47b397_read_value(data, 144 SMSC47B397_REG_FAN_MSB(i)) << 8; 145 } 146 147 data->last_updated = jiffies; 148 data->valid = 1; 149 150 dev_dbg(dev, "... device update complete\n"); 151 } 152 153 mutex_unlock(&data->update_lock); 154 155 return data; 156 } 157 158 /* 159 * TEMP: 0.001C/bit (-128C to +127C) 160 * REG: 1C/bit, two's complement 161 */ 162 static int temp_from_reg(u8 reg) 163 { 164 return (s8)reg * 1000; 165 } 166 167 static ssize_t show_temp(struct device *dev, struct device_attribute 168 *devattr, char *buf) 169 { 170 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 171 struct smsc47b397_data *data = smsc47b397_update_device(dev); 172 return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index])); 173 } 174 175 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); 176 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); 177 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); 178 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); 179 180 /* 181 * FAN: 1 RPM/bit 182 * REG: count of 90kHz pulses / revolution 183 */ 184 static int fan_from_reg(u16 reg) 185 { 186 if (reg == 0 || reg == 0xffff) 187 return 0; 188 return 90000 * 60 / reg; 189 } 190 191 static ssize_t show_fan(struct device *dev, struct device_attribute 192 *devattr, char *buf) 193 { 194 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 195 struct smsc47b397_data *data = smsc47b397_update_device(dev); 196 return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index])); 197 } 198 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); 199 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); 200 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2); 201 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3); 202 203 static struct attribute *smsc47b397_attrs[] = { 204 &sensor_dev_attr_temp1_input.dev_attr.attr, 205 &sensor_dev_attr_temp2_input.dev_attr.attr, 206 &sensor_dev_attr_temp3_input.dev_attr.attr, 207 &sensor_dev_attr_temp4_input.dev_attr.attr, 208 &sensor_dev_attr_fan1_input.dev_attr.attr, 209 &sensor_dev_attr_fan2_input.dev_attr.attr, 210 &sensor_dev_attr_fan3_input.dev_attr.attr, 211 &sensor_dev_attr_fan4_input.dev_attr.attr, 212 213 NULL 214 }; 215 216 ATTRIBUTE_GROUPS(smsc47b397); 217 218 static int smsc47b397_probe(struct platform_device *pdev); 219 220 static struct platform_driver smsc47b397_driver = { 221 .driver = { 222 .name = DRVNAME, 223 }, 224 .probe = smsc47b397_probe, 225 }; 226 227 static int smsc47b397_probe(struct platform_device *pdev) 228 { 229 struct device *dev = &pdev->dev; 230 struct smsc47b397_data *data; 231 struct device *hwmon_dev; 232 struct resource *res; 233 234 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 235 if (!devm_request_region(dev, res->start, SMSC_EXTENT, 236 smsc47b397_driver.driver.name)) { 237 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n", 238 (unsigned long)res->start, 239 (unsigned long)res->start + SMSC_EXTENT - 1); 240 return -EBUSY; 241 } 242 243 data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL); 244 if (!data) 245 return -ENOMEM; 246 247 data->addr = res->start; 248 mutex_init(&data->lock); 249 mutex_init(&data->update_lock); 250 251 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "smsc47b397", 252 data, 253 smsc47b397_groups); 254 return PTR_ERR_OR_ZERO(hwmon_dev); 255 } 256 257 static int __init smsc47b397_device_add(unsigned short address) 258 { 259 struct resource res = { 260 .start = address, 261 .end = address + SMSC_EXTENT - 1, 262 .name = DRVNAME, 263 .flags = IORESOURCE_IO, 264 }; 265 int err; 266 267 err = acpi_check_resource_conflict(&res); 268 if (err) 269 goto exit; 270 271 pdev = platform_device_alloc(DRVNAME, address); 272 if (!pdev) { 273 err = -ENOMEM; 274 pr_err("Device allocation failed\n"); 275 goto exit; 276 } 277 278 err = platform_device_add_resources(pdev, &res, 1); 279 if (err) { 280 pr_err("Device resource addition failed (%d)\n", err); 281 goto exit_device_put; 282 } 283 284 err = platform_device_add(pdev); 285 if (err) { 286 pr_err("Device addition failed (%d)\n", err); 287 goto exit_device_put; 288 } 289 290 return 0; 291 292 exit_device_put: 293 platform_device_put(pdev); 294 exit: 295 return err; 296 } 297 298 static int __init smsc47b397_find(void) 299 { 300 u8 id, rev; 301 char *name; 302 unsigned short addr; 303 304 superio_enter(); 305 id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID); 306 307 switch (id) { 308 case 0x81: 309 name = "SCH5307-NS"; 310 break; 311 case 0x6f: 312 name = "LPC47B397-NC"; 313 break; 314 case 0x85: 315 case 0x8c: 316 name = "SCH5317"; 317 break; 318 default: 319 superio_exit(); 320 return -ENODEV; 321 } 322 323 rev = superio_inb(SUPERIO_REG_DEVREV); 324 325 superio_select(SUPERIO_REG_LD8); 326 addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) 327 | superio_inb(SUPERIO_REG_BASE_LSB); 328 329 pr_info("found SMSC %s (base address 0x%04x, revision %u)\n", 330 name, addr, rev); 331 332 superio_exit(); 333 return addr; 334 } 335 336 static int __init smsc47b397_init(void) 337 { 338 unsigned short address; 339 int ret; 340 341 ret = smsc47b397_find(); 342 if (ret < 0) 343 return ret; 344 address = ret; 345 346 ret = platform_driver_register(&smsc47b397_driver); 347 if (ret) 348 goto exit; 349 350 /* Sets global pdev as a side effect */ 351 ret = smsc47b397_device_add(address); 352 if (ret) 353 goto exit_driver; 354 355 return 0; 356 357 exit_driver: 358 platform_driver_unregister(&smsc47b397_driver); 359 exit: 360 return ret; 361 } 362 363 static void __exit smsc47b397_exit(void) 364 { 365 platform_device_unregister(pdev); 366 platform_driver_unregister(&smsc47b397_driver); 367 } 368 369 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 370 MODULE_DESCRIPTION("SMSC LPC47B397 driver"); 371 MODULE_LICENSE("GPL"); 372 373 module_init(smsc47b397_init); 374 module_exit(smsc47b397_exit); 375