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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * smsc47b397.c - Part of lm_sensors, Linux kernel modules4 * for hardware monitoring5 *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 ": " fmt17 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 31static unsigned short force_id;32module_param(force_id, ushort, 0);33MODULE_PARM_DESC(force_id, "Override the detected device ID");34 35static 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 44static inline void superio_outb(int reg, int val)45{46 outb(reg, REG);47 outb(val, VAL);48}49 50static inline int superio_inb(int reg)51{52 outb(reg, REG);53 return inb(VAL);54}55 56/* select superio logical device */57static inline void superio_select(int ld)58{59 superio_outb(0x07, ld);60}61 62static 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 71static inline void superio_exit(void)72{73 outb(0xAA, REG);74 release_region(REG, 2);75}76 77#define SUPERIO_REG_DEVID 0x2078#define SUPERIO_REG_DEVREV 0x2179#define SUPERIO_REG_BASE_MSB 0x6080#define SUPERIO_REG_BASE_LSB 0x6181#define SUPERIO_REG_LD8 0x0882 83#define SMSC_EXTENT 0x0284 85/* 0 <= nr <= 3 */86static 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 93struct smsc47b397_data {94 unsigned short addr;95 struct mutex lock;96 97 struct mutex update_lock;98 unsigned long last_updated; /* in jiffies */99 bool valid;100 101 /* register values */102 u16 fan[4];103 u8 temp[4];104};105 106static 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 117static 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 = true;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 complement153 */154static int temp_from_reg(u8 reg)155{156 return (s8)reg * 1000;157}158 159static 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 167static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);168static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);169static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);170static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);171 172/*173 * FAN: 1 RPM/bit174 * REG: count of 90kHz pulses / revolution175 */176static int fan_from_reg(u16 reg)177{178 if (reg == 0 || reg == 0xffff)179 return 0;180 return 90000 * 60 / reg;181}182 183static 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}190static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);191static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);192static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);193static SENSOR_DEVICE_ATTR_RO(fan4_input, fan, 3);194 195static 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 NULL206};207 208ATTRIBUTE_GROUPS(smsc47b397);209 210static int smsc47b397_probe(struct platform_device *pdev);211 212static struct platform_driver smsc47b397_driver = {213 .driver = {214 .name = DRVNAME,215 },216 .probe = smsc47b397_probe,217};218 219static 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 249static 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 284exit_device_put:285 platform_device_put(pdev);286exit:287 return err;288}289 290static 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 332static 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 353exit_driver:354 platform_driver_unregister(&smsc47b397_driver);355exit:356 return ret;357}358 359static void __exit smsc47b397_exit(void)360{361 platform_device_unregister(pdev);362 platform_driver_unregister(&smsc47b397_driver);363}364 365MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");366MODULE_DESCRIPTION("SMSC LPC47B397 driver");367MODULE_LICENSE("GPL");368 369module_init(smsc47b397_init);370module_exit(smsc47b397_exit);371