| /* |
| * smsc47b397.c - Part of lm_sensors, Linux kernel modules |
| * for hardware monitoring |
| * |
| * Supports the SMSC LPC47B397-NC Super-I/O chip. |
| * |
| * Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com> |
| * Copyright (C) 2004 Utilitek Systems, Inc. |
| * |
| * derived in part from smsc47m1.c: |
| * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com> |
| * Copyright (C) 2004 Jean Delvare <khali@linux-fr.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/ioport.h> |
| #include <linux/jiffies.h> |
| #include <linux/platform_device.h> |
| #include <linux/hwmon.h> |
| #include <linux/hwmon-sysfs.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/mutex.h> |
| #include <linux/acpi.h> |
| #include <linux/io.h> |
| |
| static unsigned short force_id; |
| module_param(force_id, ushort, 0); |
| MODULE_PARM_DESC(force_id, "Override the detected device ID"); |
| |
| static struct platform_device *pdev; |
| |
| #define DRVNAME "smsc47b397" |
| |
| /* Super-I/0 registers and commands */ |
| |
| #define REG 0x2e /* The register to read/write */ |
| #define VAL 0x2f /* The value to read/write */ |
| |
| static inline void superio_outb(int reg, int val) |
| { |
| outb(reg, REG); |
| outb(val, VAL); |
| } |
| |
| static inline int superio_inb(int reg) |
| { |
| outb(reg, REG); |
| return inb(VAL); |
| } |
| |
| /* select superio logical device */ |
| static inline void superio_select(int ld) |
| { |
| superio_outb(0x07, ld); |
| } |
| |
| static inline void superio_enter(void) |
| { |
| outb(0x55, REG); |
| } |
| |
| static inline void superio_exit(void) |
| { |
| outb(0xAA, REG); |
| } |
| |
| #define SUPERIO_REG_DEVID 0x20 |
| #define SUPERIO_REG_DEVREV 0x21 |
| #define SUPERIO_REG_BASE_MSB 0x60 |
| #define SUPERIO_REG_BASE_LSB 0x61 |
| #define SUPERIO_REG_LD8 0x08 |
| |
| #define SMSC_EXTENT 0x02 |
| |
| /* 0 <= nr <= 3 */ |
| static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80}; |
| #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)]) |
| |
| /* 0 <= nr <= 3 */ |
| #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr)) |
| #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr)) |
| |
| struct smsc47b397_data { |
| unsigned short addr; |
| const char *name; |
| struct device *hwmon_dev; |
| struct mutex lock; |
| |
| struct mutex update_lock; |
| unsigned long last_updated; /* in jiffies */ |
| int valid; |
| |
| /* register values */ |
| u16 fan[4]; |
| u8 temp[4]; |
| }; |
| |
| static int smsc47b397_read_value(struct smsc47b397_data *data, u8 reg) |
| { |
| int res; |
| |
| mutex_lock(&data->lock); |
| outb(reg, data->addr); |
| res = inb_p(data->addr + 1); |
| mutex_unlock(&data->lock); |
| return res; |
| } |
| |
| static struct smsc47b397_data *smsc47b397_update_device(struct device *dev) |
| { |
| struct smsc47b397_data *data = dev_get_drvdata(dev); |
| int i; |
| |
| mutex_lock(&data->update_lock); |
| |
| if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
| dev_dbg(dev, "starting device update...\n"); |
| |
| /* 4 temperature inputs, 4 fan inputs */ |
| for (i = 0; i < 4; i++) { |
| data->temp[i] = smsc47b397_read_value(data, |
| SMSC47B397_REG_TEMP(i)); |
| |
| /* must read LSB first */ |
| data->fan[i] = smsc47b397_read_value(data, |
| SMSC47B397_REG_FAN_LSB(i)); |
| data->fan[i] |= smsc47b397_read_value(data, |
| SMSC47B397_REG_FAN_MSB(i)) << 8; |
| } |
| |
| data->last_updated = jiffies; |
| data->valid = 1; |
| |
| dev_dbg(dev, "... device update complete\n"); |
| } |
| |
| mutex_unlock(&data->update_lock); |
| |
| return data; |
| } |
| |
| /* |
| * TEMP: 0.001C/bit (-128C to +127C) |
| * REG: 1C/bit, two's complement |
| */ |
| static int temp_from_reg(u8 reg) |
| { |
| return (s8)reg * 1000; |
| } |
| |
| static ssize_t show_temp(struct device *dev, struct device_attribute |
| *devattr, char *buf) |
| { |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct smsc47b397_data *data = smsc47b397_update_device(dev); |
| return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index])); |
| } |
| |
| static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); |
| static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); |
| static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); |
| static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); |
| |
| /* |
| * FAN: 1 RPM/bit |
| * REG: count of 90kHz pulses / revolution |
| */ |
| static int fan_from_reg(u16 reg) |
| { |
| if (reg == 0 || reg == 0xffff) |
| return 0; |
| return 90000 * 60 / reg; |
| } |
| |
| static ssize_t show_fan(struct device *dev, struct device_attribute |
| *devattr, char *buf) |
| { |
| struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| struct smsc47b397_data *data = smsc47b397_update_device(dev); |
| return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index])); |
| } |
| static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0); |
| static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1); |
| static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2); |
| static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3); |
| |
| static ssize_t show_name(struct device *dev, struct device_attribute |
| *devattr, char *buf) |
| { |
| struct smsc47b397_data *data = dev_get_drvdata(dev); |
| return sprintf(buf, "%s\n", data->name); |
| } |
| static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); |
| |
| static struct attribute *smsc47b397_attributes[] = { |
| &sensor_dev_attr_temp1_input.dev_attr.attr, |
| &sensor_dev_attr_temp2_input.dev_attr.attr, |
| &sensor_dev_attr_temp3_input.dev_attr.attr, |
| &sensor_dev_attr_temp4_input.dev_attr.attr, |
| &sensor_dev_attr_fan1_input.dev_attr.attr, |
| &sensor_dev_attr_fan2_input.dev_attr.attr, |
| &sensor_dev_attr_fan3_input.dev_attr.attr, |
| &sensor_dev_attr_fan4_input.dev_attr.attr, |
| |
| &dev_attr_name.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group smsc47b397_group = { |
| .attrs = smsc47b397_attributes, |
| }; |
| |
| static int __devexit smsc47b397_remove(struct platform_device *pdev) |
| { |
| struct smsc47b397_data *data = platform_get_drvdata(pdev); |
| |
| hwmon_device_unregister(data->hwmon_dev); |
| sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group); |
| |
| return 0; |
| } |
| |
| static int smsc47b397_probe(struct platform_device *pdev); |
| |
| static struct platform_driver smsc47b397_driver = { |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = DRVNAME, |
| }, |
| .probe = smsc47b397_probe, |
| .remove = smsc47b397_remove, |
| }; |
| |
| static int __devinit smsc47b397_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct smsc47b397_data *data; |
| struct resource *res; |
| int err = 0; |
| |
| res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
| if (!devm_request_region(dev, res->start, SMSC_EXTENT, |
| smsc47b397_driver.driver.name)) { |
| dev_err(dev, "Region 0x%lx-0x%lx already in use!\n", |
| (unsigned long)res->start, |
| (unsigned long)res->start + SMSC_EXTENT - 1); |
| return -EBUSY; |
| } |
| |
| data = devm_kzalloc(dev, sizeof(struct smsc47b397_data), GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| data->addr = res->start; |
| data->name = "smsc47b397"; |
| mutex_init(&data->lock); |
| mutex_init(&data->update_lock); |
| platform_set_drvdata(pdev, data); |
| |
| err = sysfs_create_group(&dev->kobj, &smsc47b397_group); |
| if (err) |
| return err; |
| |
| data->hwmon_dev = hwmon_device_register(dev); |
| if (IS_ERR(data->hwmon_dev)) { |
| err = PTR_ERR(data->hwmon_dev); |
| goto error_remove; |
| } |
| |
| return 0; |
| |
| error_remove: |
| sysfs_remove_group(&dev->kobj, &smsc47b397_group); |
| return err; |
| } |
| |
| static int __init smsc47b397_device_add(unsigned short address) |
| { |
| struct resource res = { |
| .start = address, |
| .end = address + SMSC_EXTENT - 1, |
| .name = DRVNAME, |
| .flags = IORESOURCE_IO, |
| }; |
| int err; |
| |
| err = acpi_check_resource_conflict(&res); |
| if (err) |
| goto exit; |
| |
| pdev = platform_device_alloc(DRVNAME, address); |
| if (!pdev) { |
| err = -ENOMEM; |
| pr_err("Device allocation failed\n"); |
| goto exit; |
| } |
| |
| err = platform_device_add_resources(pdev, &res, 1); |
| if (err) { |
| pr_err("Device resource addition failed (%d)\n", err); |
| goto exit_device_put; |
| } |
| |
| err = platform_device_add(pdev); |
| if (err) { |
| pr_err("Device addition failed (%d)\n", err); |
| goto exit_device_put; |
| } |
| |
| return 0; |
| |
| exit_device_put: |
| platform_device_put(pdev); |
| exit: |
| return err; |
| } |
| |
| static int __init smsc47b397_find(void) |
| { |
| u8 id, rev; |
| char *name; |
| unsigned short addr; |
| |
| superio_enter(); |
| id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID); |
| |
| switch (id) { |
| case 0x81: |
| name = "SCH5307-NS"; |
| break; |
| case 0x6f: |
| name = "LPC47B397-NC"; |
| break; |
| case 0x85: |
| case 0x8c: |
| name = "SCH5317"; |
| break; |
| default: |
| superio_exit(); |
| return -ENODEV; |
| } |
| |
| rev = superio_inb(SUPERIO_REG_DEVREV); |
| |
| superio_select(SUPERIO_REG_LD8); |
| addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8) |
| | superio_inb(SUPERIO_REG_BASE_LSB); |
| |
| pr_info("found SMSC %s (base address 0x%04x, revision %u)\n", |
| name, addr, rev); |
| |
| superio_exit(); |
| return addr; |
| } |
| |
| static int __init smsc47b397_init(void) |
| { |
| unsigned short address; |
| int ret; |
| |
| ret = smsc47b397_find(); |
| if (ret < 0) |
| return ret; |
| address = ret; |
| |
| ret = platform_driver_register(&smsc47b397_driver); |
| if (ret) |
| goto exit; |
| |
| /* Sets global pdev as a side effect */ |
| ret = smsc47b397_device_add(address); |
| if (ret) |
| goto exit_driver; |
| |
| return 0; |
| |
| exit_driver: |
| platform_driver_unregister(&smsc47b397_driver); |
| exit: |
| return ret; |
| } |
| |
| static void __exit smsc47b397_exit(void) |
| { |
| platform_device_unregister(pdev); |
| platform_driver_unregister(&smsc47b397_driver); |
| } |
| |
| MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); |
| MODULE_DESCRIPTION("SMSC LPC47B397 driver"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(smsc47b397_init); |
| module_exit(smsc47b397_exit); |