diff options
Diffstat (limited to 'drivers/hwmon/smsc47b397.c')
| -rw-r--r-- | drivers/hwmon/smsc47b397.c | 409 |
1 files changed, 409 insertions, 0 deletions
diff --git a/drivers/hwmon/smsc47b397.c b/drivers/hwmon/smsc47b397.c new file mode 100644 index 0000000..eb03544 --- /dev/null +++ b/drivers/hwmon/smsc47b397.c @@ -0,0 +1,409 @@ +/* + 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. +*/ + +#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 <asm/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); + struct resource *res; + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group); + res = platform_get_resource(pdev, IORESOURCE_IO, 0); + release_region(res->start, SMSC_EXTENT); + kfree(data); + + 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 = __devexit_p(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 (!request_region(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; + } + + if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) { + err = -ENOMEM; + goto error_release; + } + + data->addr = res->start; + data->name = "smsc47b397"; + mutex_init(&data->lock); + mutex_init(&data->update_lock); + platform_set_drvdata(pdev, data); + + if ((err = sysfs_create_group(&dev->kobj, &smsc47b397_group))) + goto error_free; + + 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); +error_free: + kfree(data); +error_release: + release_region(res->start, SMSC_EXTENT); + 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; + + pdev = platform_device_alloc(DRVNAME, address); + if (!pdev) { + err = -ENOMEM; + printk(KERN_ERR DRVNAME ": Device allocation failed\n"); + goto exit; + } + + err = platform_device_add_resources(pdev, &res, 1); + if (err) { + printk(KERN_ERR DRVNAME ": Device resource addition failed " + "(%d)\n", err); + goto exit_device_put; + } + + err = platform_device_add(pdev); + if (err) { + printk(KERN_ERR DRVNAME ": 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(unsigned short *addr) +{ + u8 id, rev; + char *name; + + 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); + + printk(KERN_INFO DRVNAME ": found SMSC %s " + "(base address 0x%04x, revision %u)\n", + name, *addr, rev); + + superio_exit(); + return 0; +} + +static int __init smsc47b397_init(void) +{ + unsigned short address; + int ret; + + if ((ret = smsc47b397_find(&address))) + return 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); |
