drivers/hwmon/smsc47b397.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * smsc47b397.c - Part of lm_sensors, Linux kernel modules
   4  * for hardware monitoring
   5  *
   6  * Supports the SMSC LPC47B397-NC Super-I/O chip.
   7  *
   8  * Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
   9  * Copyright (C) 2004 Utilitek Systems, Inc.
  10  *
  11  * derived in part from smsc47m1.c:
  12  * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
  13  * Copyright (C) 2004 Jean Delvare <jdelvare@suse.de>
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/ioport.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/hwmon.h>
  24 #include <linux/hwmon-sysfs.h>
  25 #include <linux/err.h>
  26 #include <linux/init.h>
  27 #include <linux/mutex.h>
  28 #include <linux/acpi.h>
  29 #include <linux/io.h>
  30
  31 static unsigned short force_id;
  32 module_param(force_id, ushort, 0);
  33 MODULE_PARM_DESC(force_id, "Override the detected device ID");
  34
  35 static struct platform_device *pdev;
  36
  37 #define DRVNAME "smsc47b397"
  38
  39 /* Super-I/0 registers and commands */
  40
  41 #define REG     0x2e    /* The register to read/write */
  42 #define VAL     0x2f    /* The value to read/write */
  43
  44 static inline void superio_outb(int reg, int val)
  45 {
  46         outb(reg, REG);
  47         outb(val, VAL);
  48 }
  49
  50 static inline int superio_inb(int reg)
  51 {
  52         outb(reg, REG);
  53         return inb(VAL);
  54 }
  55
  56 /* select superio logical device */
  57 static inline void superio_select(int ld)
  58 {
  59         superio_outb(0x07, ld);
  60 }
  61
  62 static inline int superio_enter(void)
  63 {
  64         if (!request_muxed_region(REG, 2, DRVNAME))
  65                 return -EBUSY;
  66
  67         outb(0x55, REG);
  68         return 0;
  69 }
  70
  71 static inline void superio_exit(void)
  72 {
  73         outb(0xAA, REG);
  74         release_region(REG, 2);
  75 }
  76
  77 #define SUPERIO_REG_DEVID       0x20
  78 #define SUPERIO_REG_DEVREV      0x21
  79 #define SUPERIO_REG_BASE_MSB    0x60
  80 #define SUPERIO_REG_BASE_LSB    0x61
  81 #define SUPERIO_REG_LD8         0x08
  82
  83 #define SMSC_EXTENT             0x02
  84
  85 /* 0 <= nr <= 3 */
  86 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
  87 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
  88
  89 /* 0 <= nr <= 3 */
  90 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
  91 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
  92
  93 struct smsc47b397_data {
  94         unsigned short addr;
  95         struct mutex lock;
  96
  97         struct mutex update_lock;
  98         unsigned long last_updated; /* in jiffies */
  99         int valid;
 100
 101         /* register values */
 102         u16 fan[4];
 103         u8 temp[4];
 104 };
 105
 106 static int smsc47b397_read_value(struct smsc47b397_data *data, u8 reg)
 107 {
 108         int res;
 109
 110         mutex_lock(&data->lock);
 111         outb(reg, data->addr);
 112         res = inb_p(data->addr + 1);
 113         mutex_unlock(&data->lock);
 114         return res;
 115 }
 116
 117 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
 118 {
 119         struct smsc47b397_data *data = dev_get_drvdata(dev);
 120         int i;
 121
 122         mutex_lock(&data->update_lock);
 123
 124         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 125                 dev_dbg(dev, "starting device update...\n");
 126
 127                 /* 4 temperature inputs, 4 fan inputs */
 128                 for (i = 0; i < 4; i++) {
 129                         data->temp[i] = smsc47b397_read_value(data,
 130                                         SMSC47B397_REG_TEMP(i));
 131
 132                         /* must read LSB first */
 133                         data->fan[i]  = smsc47b397_read_value(data,
 134                                         SMSC47B397_REG_FAN_LSB(i));
 135                         data->fan[i] |= smsc47b397_read_value(data,
 136                                         SMSC47B397_REG_FAN_MSB(i)) << 8;
 137                 }
 138
 139                 data->last_updated = jiffies;
 140                 data->valid = 1;
 141
 142                 dev_dbg(dev, "... device update complete\n");
 143         }
 144
 145         mutex_unlock(&data->update_lock);
 146
 147         return data;
 148 }
 149
 150 /*
 151  * TEMP: 0.001C/bit (-128C to +127C)
 152  * REG: 1C/bit, two's complement
 153  */
 154 static int temp_from_reg(u8 reg)
 155 {
 156         return (s8)reg * 1000;
 157 }
 158
 159 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
 160                          char *buf)
 161 {
 162         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 163         struct smsc47b397_data *data = smsc47b397_update_device(dev);
 164         return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
 165 }
 166
 167 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
 168 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
 169 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
 170 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
 171
 172 /*
 173  * FAN: 1 RPM/bit
 174  * REG: count of 90kHz pulses / revolution
 175  */
 176 static int fan_from_reg(u16 reg)
 177 {
 178         if (reg == 0 || reg == 0xffff)
 179                 return 0;
 180         return 90000 * 60 / reg;
 181 }
 182
 183 static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
 184                         char *buf)
 185 {
 186         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 187         struct smsc47b397_data *data = smsc47b397_update_device(dev);
 188         return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
 189 }
 190 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
 191 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
 192 static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
 193 static SENSOR_DEVICE_ATTR_RO(fan4_input, fan, 3);
 194
 195 static struct attribute *smsc47b397_attrs[] = {
 196         &sensor_dev_attr_temp1_input.dev_attr.attr,
 197         &sensor_dev_attr_temp2_input.dev_attr.attr,
 198         &sensor_dev_attr_temp3_input.dev_attr.attr,
 199         &sensor_dev_attr_temp4_input.dev_attr.attr,
 200         &sensor_dev_attr_fan1_input.dev_attr.attr,
 201         &sensor_dev_attr_fan2_input.dev_attr.attr,
 202         &sensor_dev_attr_fan3_input.dev_attr.attr,
 203         &sensor_dev_attr_fan4_input.dev_attr.attr,
 204
 205         NULL
 206 };
 207
 208 ATTRIBUTE_GROUPS(smsc47b397);
 209
 210 static int smsc47b397_probe(struct platform_device *pdev);
 211
 212 static struct platform_driver smsc47b397_driver = {
 213         .driver = {
 214                 .name   = DRVNAME,
 215         },
 216         .probe          = smsc47b397_probe,
 217 };
 218
 219 static int smsc47b397_probe(struct platform_device *pdev)
 220 {
 221         struct device *dev = &pdev->dev;
 222         struct smsc47b397_data *data;
 223         struct device *hwmon_dev;
 224         struct resource *res;
 225
 226         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 227         if (!devm_request_region(dev, res->start, SMSC_EXTENT,
 228                                  smsc47b397_driver.driver.name)) {
 229                 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
 230                         (unsigned long)res->start,
 231                         (unsigned long)res->start + SMSC_EXTENT - 1);
 232                 return -EBUSY;
 233         }
 234
 235         data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL);
 236         if (!data)
 237                 return -ENOMEM;
 238
 239         data->addr = res->start;
 240         mutex_init(&data->lock);
 241         mutex_init(&data->update_lock);
 242
 243         hwmon_dev = devm_hwmon_device_register_with_groups(dev, "smsc47b397",
 244                                                            data,
 245                                                            smsc47b397_groups);
 246         return PTR_ERR_OR_ZERO(hwmon_dev);
 247 }
 248
 249 static int __init smsc47b397_device_add(unsigned short address)
 250 {
 251         struct resource res = {
 252                 .start  = address,
 253                 .end    = address + SMSC_EXTENT - 1,
 254                 .name   = DRVNAME,
 255                 .flags  = IORESOURCE_IO,
 256         };
 257         int err;
 258
 259         err = acpi_check_resource_conflict(&res);
 260         if (err)
 261                 goto exit;
 262
 263         pdev = platform_device_alloc(DRVNAME, address);
 264         if (!pdev) {
 265                 err = -ENOMEM;
 266                 pr_err("Device allocation failed\n");
 267                 goto exit;
 268         }
 269
 270         err = platform_device_add_resources(pdev, &res, 1);
 271         if (err) {
 272                 pr_err("Device resource addition failed (%d)\n", err);
 273                 goto exit_device_put;
 274         }
 275
 276         err = platform_device_add(pdev);
 277         if (err) {
 278                 pr_err("Device addition failed (%d)\n", err);
 279                 goto exit_device_put;
 280         }
 281
 282         return 0;
 283
 284 exit_device_put:
 285         platform_device_put(pdev);
 286 exit:
 287         return err;
 288 }
 289
 290 static int __init smsc47b397_find(void)
 291 {
 292         u8 id, rev;
 293         char *name;
 294         unsigned short addr;
 295         int err;
 296
 297         err = superio_enter();
 298         if (err)
 299                 return err;
 300
 301         id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
 302
 303         switch (id) {
 304         case 0x81:
 305                 name = "SCH5307-NS";
 306                 break;
 307         case 0x6f:
 308                 name = "LPC47B397-NC";
 309                 break;
 310         case 0x85:
 311         case 0x8c:
 312                 name = "SCH5317";
 313                 break;
 314         default:
 315                 superio_exit();
 316                 return -ENODEV;
 317         }
 318
 319         rev = superio_inb(SUPERIO_REG_DEVREV);
 320
 321         superio_select(SUPERIO_REG_LD8);
 322         addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
 323                  |  superio_inb(SUPERIO_REG_BASE_LSB);
 324
 325         pr_info("found SMSC %s (base address 0x%04x, revision %u)\n",
 326                 name, addr, rev);
 327
 328         superio_exit();
 329         return addr;
 330 }
 331
 332 static int __init smsc47b397_init(void)
 333 {
 334         unsigned short address;
 335         int ret;
 336
 337         ret = smsc47b397_find();
 338         if (ret < 0)
 339                 return ret;
 340         address = ret;
 341
 342         ret = platform_driver_register(&smsc47b397_driver);
 343         if (ret)
 344                 goto exit;
 345
 346         /* Sets global pdev as a side effect */
 347         ret = smsc47b397_device_add(address);
 348         if (ret)
 349                 goto exit_driver;
 350
 351         return 0;
 352
 353 exit_driver:
 354         platform_driver_unregister(&smsc47b397_driver);
 355 exit:
 356         return ret;
 357 }
 358
 359 static void __exit smsc47b397_exit(void)
 360 {
 361         platform_device_unregister(pdev);
 362         platform_driver_unregister(&smsc47b397_driver);
 363 }
 364
 365 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 366 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
 367 MODULE_LICENSE("GPL");
 368
 369 module_init(smsc47b397_init);
 370 module_exit(smsc47b397_exit);