diff options
Diffstat (limited to 'drivers/hwmon/pc87427.c')
| -rw-r--r-- | drivers/hwmon/pc87427.c | 627 |
1 files changed, 627 insertions, 0 deletions
diff --git a/drivers/hwmon/pc87427.c b/drivers/hwmon/pc87427.c new file mode 100644 index 000000000000..affa21a5ccfd --- /dev/null +++ b/drivers/hwmon/pc87427.c @@ -0,0 +1,627 @@ +/* + * pc87427.c - hardware monitoring driver for the + * National Semiconductor PC87427 Super-I/O chip + * Copyright (C) 2006 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 version 2 as + * published by the Free Software Foundation. + * + * 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. + * + * Supports the following chips: + * + * Chip #vin #fan #pwm #temp devid + * PC87427 - 8 - - 0xF2 + * + * This driver assumes that no more than one chip is present. + * Only fan inputs are supported so far, although the chip can do much more. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.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/mutex.h> +#include <linux/sysfs.h> +#include <asm/io.h> + +static struct platform_device *pdev; + +#define DRVNAME "pc87427" + +/* The lock mutex protects both the I/O accesses (needed because the + device is using banked registers) and the register cache (needed to keep + the data in the registers and the cache in sync at any time). */ +struct pc87427_data { + struct class_device *class_dev; + struct mutex lock; + int address[2]; + const char *name; + + unsigned long last_updated; /* in jiffies */ + u8 fan_enabled; /* bit vector */ + u16 fan[8]; /* register values */ + u16 fan_min[8]; /* register values */ + u8 fan_status[8]; /* register values */ +}; + +/* + * Super-I/O registers and operations + */ + +#define SIOREG_LDSEL 0x07 /* Logical device select */ +#define SIOREG_DEVID 0x20 /* Device ID */ +#define SIOREG_ACT 0x30 /* Device activation */ +#define SIOREG_MAP 0x50 /* I/O or memory mapping */ +#define SIOREG_IOBASE 0x60 /* I/O base address */ + +static const u8 logdev[2] = { 0x09, 0x14 }; +static const char *logdev_str[2] = { DRVNAME " FMC", DRVNAME " HMC" }; +#define LD_FAN 0 +#define LD_IN 1 +#define LD_TEMP 1 + +static inline void superio_outb(int sioaddr, int reg, int val) +{ + outb(reg, sioaddr); + outb(val, sioaddr + 1); +} + +static inline int superio_inb(int sioaddr, int reg) +{ + outb(reg, sioaddr); + return inb(sioaddr + 1); +} + +static inline void superio_exit(int sioaddr) +{ + outb(0x02, sioaddr); + outb(0x02, sioaddr + 1); +} + +/* + * Logical devices + */ + +#define REGION_LENGTH 32 +#define PC87427_REG_BANK 0x0f +#define BANK_FM(nr) (nr) +#define BANK_FT(nr) (0x08 + (nr)) +#define BANK_FC(nr) (0x10 + (nr) * 2) + +/* + * I/O access functions + */ + +/* ldi is the logical device index */ +static inline int pc87427_read8(struct pc87427_data *data, u8 ldi, u8 reg) +{ + return inb(data->address[ldi] + reg); +} + +/* Must be called with data->lock held, except during init */ +static inline int pc87427_read8_bank(struct pc87427_data *data, u8 ldi, + u8 bank, u8 reg) +{ + outb(bank, data->address[ldi] + PC87427_REG_BANK); + return inb(data->address[ldi] + reg); +} + +/* Must be called with data->lock held, except during init */ +static inline void pc87427_write8_bank(struct pc87427_data *data, u8 ldi, + u8 bank, u8 reg, u8 value) +{ + outb(bank, data->address[ldi] + PC87427_REG_BANK); + outb(value, data->address[ldi] + reg); +} + +/* + * Fan registers and conversions + */ + +/* fan data registers are 16-bit wide */ +#define PC87427_REG_FAN 0x12 +#define PC87427_REG_FAN_MIN 0x14 +#define PC87427_REG_FAN_STATUS 0x10 + +#define FAN_STATUS_STALL (1 << 3) +#define FAN_STATUS_LOSPD (1 << 1) +#define FAN_STATUS_MONEN (1 << 0) + +/* Dedicated function to read all registers related to a given fan input. + This saves us quite a few locks and bank selections. + Must be called with data->lock held. + nr is from 0 to 7 */ +static void pc87427_readall_fan(struct pc87427_data *data, u8 nr) +{ + int iobase = data->address[LD_FAN]; + + outb(BANK_FM(nr), iobase + PC87427_REG_BANK); + data->fan[nr] = inw(iobase + PC87427_REG_FAN); + data->fan_min[nr] = inw(iobase + PC87427_REG_FAN_MIN); + data->fan_status[nr] = inb(iobase + PC87427_REG_FAN_STATUS); + /* Clear fan alarm bits */ + outb(data->fan_status[nr], iobase + PC87427_REG_FAN_STATUS); +} + +/* The 2 LSB of fan speed registers are used for something different. + The actual 2 LSB of the measurements are not available. */ +static inline unsigned long fan_from_reg(u16 reg) +{ + reg &= 0xfffc; + if (reg == 0x0000 || reg == 0xfffc) + return 0; + return 5400000UL / reg; +} + +/* The 2 LSB of the fan speed limit registers are not significant. */ +static inline u16 fan_to_reg(unsigned long val) +{ + if (val < 83UL) + return 0xffff; + if (val >= 1350000UL) + return 0x0004; + return ((1350000UL + val / 2) / val) << 2; +} + +/* + * Data interface + */ + +static struct pc87427_data *pc87427_update_device(struct device *dev) +{ + struct pc87427_data *data = dev_get_drvdata(dev); + int i; + + mutex_lock(&data->lock); + if (!time_after(jiffies, data->last_updated + HZ) + && data->last_updated) + goto done; + + /* Fans */ + for (i = 0; i < 8; i++) { + if (!(data->fan_enabled & (1 << i))) + continue; + pc87427_readall_fan(data, i); + } + data->last_updated = jiffies; + +done: + mutex_unlock(&data->lock); + return data; +} + +static ssize_t show_fan_input(struct device *dev, struct device_attribute + *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct pc87427_data *data = pc87427_update_device(dev); + int nr = attr->index; + + return sprintf(buf, "%lu\n", fan_from_reg(data->fan[nr])); +} + +static ssize_t show_fan_min(struct device *dev, struct device_attribute + *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct pc87427_data *data = pc87427_update_device(dev); + int nr = attr->index; + + return sprintf(buf, "%lu\n", fan_from_reg(data->fan_min[nr])); +} + +static ssize_t show_fan_alarm(struct device *dev, struct device_attribute + *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct pc87427_data *data = pc87427_update_device(dev); + int nr = attr->index; + + return sprintf(buf, "%d\n", !!(data->fan_status[nr] + & FAN_STATUS_LOSPD)); +} + +static ssize_t show_fan_fault(struct device *dev, struct device_attribute + *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct pc87427_data *data = pc87427_update_device(dev); + int nr = attr->index; + + return sprintf(buf, "%d\n", !!(data->fan_status[nr] + & FAN_STATUS_STALL)); +} + +static ssize_t set_fan_min(struct device *dev, struct device_attribute + *devattr, const char *buf, size_t count) +{ + struct pc87427_data *data = dev_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + int nr = attr->index; + unsigned long val = simple_strtoul(buf, NULL, 10); + int iobase = data->address[LD_FAN]; + + mutex_lock(&data->lock); + outb(BANK_FM(nr), iobase + PC87427_REG_BANK); + /* The low speed limit registers are read-only while monitoring + is enabled, so we have to disable monitoring, then change the + limit, and finally enable monitoring again. */ + outb(0, iobase + PC87427_REG_FAN_STATUS); + data->fan_min[nr] = fan_to_reg(val); + outw(data->fan_min[nr], iobase + PC87427_REG_FAN_MIN); + outb(FAN_STATUS_MONEN, iobase + PC87427_REG_FAN_STATUS); + mutex_unlock(&data->lock); + + return count; +} + +static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0); +static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1); +static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan_input, NULL, 2); +static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan_input, NULL, 3); +static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, show_fan_input, NULL, 4); +static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, show_fan_input, NULL, 5); +static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, show_fan_input, NULL, 6); +static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, show_fan_input, NULL, 7); + +static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, + show_fan_min, set_fan_min, 0); +static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, + show_fan_min, set_fan_min, 1); +static SENSOR_DEVICE_ATTR(fan3_min, S_IWUSR | S_IRUGO, + show_fan_min, set_fan_min, 2); +static SENSOR_DEVICE_ATTR(fan4_min, S_IWUSR | S_IRUGO, + show_fan_min, set_fan_min, 3); +static SENSOR_DEVICE_ATTR(fan5_min, S_IWUSR | S_IRUGO, + show_fan_min, set_fan_min, 4); +static SENSOR_DEVICE_ATTR(fan6_min, S_IWUSR | S_IRUGO, + show_fan_min, set_fan_min, 5); +static SENSOR_DEVICE_ATTR(fan7_min, S_IWUSR | S_IRUGO, + show_fan_min, set_fan_min, 6); +static SENSOR_DEVICE_ATTR(fan8_min, S_IWUSR | S_IRUGO, + show_fan_min, set_fan_min, 7); + +static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL, 0); +static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_fan_alarm, NULL, 1); +static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_fan_alarm, NULL, 2); +static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_fan_alarm, NULL, 3); +static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_fan_alarm, NULL, 4); +static SENSOR_DEVICE_ATTR(fan6_alarm, S_IRUGO, show_fan_alarm, NULL, 5); +static SENSOR_DEVICE_ATTR(fan7_alarm, S_IRUGO, show_fan_alarm, NULL, 6); +static SENSOR_DEVICE_ATTR(fan8_alarm, S_IRUGO, show_fan_alarm, NULL, 7); + +static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0); +static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault, NULL, 1); +static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, show_fan_fault, NULL, 2); +static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, show_fan_fault, NULL, 3); +static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, show_fan_fault, NULL, 4); +static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, show_fan_fault, NULL, 5); +static SENSOR_DEVICE_ATTR(fan7_fault, S_IRUGO, show_fan_fault, NULL, 6); +static SENSOR_DEVICE_ATTR(fan8_fault, S_IRUGO, show_fan_fault, NULL, 7); + +static struct attribute *pc87427_attributes_fan[8][5] = { + { + &sensor_dev_attr_fan1_input.dev_attr.attr, + &sensor_dev_attr_fan1_min.dev_attr.attr, + &sensor_dev_attr_fan1_alarm.dev_attr.attr, + &sensor_dev_attr_fan1_fault.dev_attr.attr, + NULL + }, { + &sensor_dev_attr_fan2_input.dev_attr.attr, + &sensor_dev_attr_fan2_min.dev_attr.attr, + &sensor_dev_attr_fan2_alarm.dev_attr.attr, + &sensor_dev_attr_fan2_fault.dev_attr.attr, + NULL + }, { + &sensor_dev_attr_fan3_input.dev_attr.attr, + &sensor_dev_attr_fan3_min.dev_attr.attr, + &sensor_dev_attr_fan3_alarm.dev_attr.attr, + &sensor_dev_attr_fan3_fault.dev_attr.attr, + NULL + }, { + &sensor_dev_attr_fan4_input.dev_attr.attr, + &sensor_dev_attr_fan4_min.dev_attr.attr, + &sensor_dev_attr_fan4_alarm.dev_attr.attr, + &sensor_dev_attr_fan4_fault.dev_attr.attr, + NULL + }, { + &sensor_dev_attr_fan5_input.dev_attr.attr, + &sensor_dev_attr_fan5_min.dev_attr.attr, + &sensor_dev_attr_fan5_alarm.dev_attr.attr, + &sensor_dev_attr_fan5_fault.dev_attr.attr, + NULL + }, { + &sensor_dev_attr_fan6_input.dev_attr.attr, + &sensor_dev_attr_fan6_min.dev_attr.attr, + &sensor_dev_attr_fan6_alarm.dev_attr.attr, + &sensor_dev_attr_fan6_fault.dev_attr.attr, + NULL + }, { + &sensor_dev_attr_fan7_input.dev_attr.attr, + &sensor_dev_attr_fan7_min.dev_attr.attr, + &sensor_dev_attr_fan7_alarm.dev_attr.attr, + &sensor_dev_attr_fan7_fault.dev_attr.attr, + NULL + }, { + &sensor_dev_attr_fan8_input.dev_attr.attr, + &sensor_dev_attr_fan8_min.dev_attr.attr, + &sensor_dev_attr_fan8_alarm.dev_attr.attr, + &sensor_dev_attr_fan8_fault.dev_attr.attr, + NULL + } +}; + +static const struct attribute_group pc87427_group_fan[8] = { + { .attrs = pc87427_attributes_fan[0] }, + { .attrs = pc87427_attributes_fan[1] }, + { .attrs = pc87427_attributes_fan[2] }, + { .attrs = pc87427_attributes_fan[3] }, + { .attrs = pc87427_attributes_fan[4] }, + { .attrs = pc87427_attributes_fan[5] }, + { .attrs = pc87427_attributes_fan[6] }, + { .attrs = pc87427_attributes_fan[7] }, +}; + +static ssize_t show_name(struct device *dev, struct device_attribute + *devattr, char *buf) +{ + struct pc87427_data *data = dev_get_drvdata(dev); + + return sprintf(buf, "%s\n", data->name); +} +static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); + + +/* + * Device detection, attach and detach + */ + +static void __devinit pc87427_init_device(struct device *dev) +{ + struct pc87427_data *data = dev_get_drvdata(dev); + int i; + u8 reg; + + /* The FMC module should be ready */ + reg = pc87427_read8(data, LD_FAN, PC87427_REG_BANK); + if (!(reg & 0x80)) + dev_warn(dev, "FMC module not ready!\n"); + + /* Check which fans are enabled */ + for (i = 0; i < 8; i++) { + reg = pc87427_read8_bank(data, LD_FAN, BANK_FM(i), + PC87427_REG_FAN_STATUS); + if (reg & FAN_STATUS_MONEN) + data->fan_enabled |= (1 << i); + } + + if (!data->fan_enabled) { + dev_dbg(dev, "Enabling all fan inputs\n"); + for (i = 0; i < 8; i++) + pc87427_write8_bank(data, LD_FAN, BANK_FM(i), + PC87427_REG_FAN_STATUS, + FAN_STATUS_MONEN); + data->fan_enabled = 0xff; + } +} + +static int __devinit pc87427_probe(struct platform_device *pdev) +{ + struct pc87427_data *data; + struct resource *res; + int i, err; + + if (!(data = kzalloc(sizeof(struct pc87427_data), GFP_KERNEL))) { + err = -ENOMEM; + printk(KERN_ERR DRVNAME ": Out of memory\n"); + goto exit; + } + + /* This will need to be revisited when we add support for + temperature and voltage monitoring. */ + res = platform_get_resource(pdev, IORESOURCE_IO, 0); + data->address[0] = res->start; + + mutex_init(&data->lock); + data->name = "pc87427"; + platform_set_drvdata(pdev, data); + pc87427_init_device(&pdev->dev); + + /* Register sysfs hooks */ + if ((err = device_create_file(&pdev->dev, &dev_attr_name))) + goto exit_kfree; + for (i = 0; i < 8; i++) { + if (!(data->fan_enabled & (1 << i))) + continue; + if ((err = sysfs_create_group(&pdev->dev.kobj, + &pc87427_group_fan[i]))) + goto exit_remove_files; + } + + data->class_dev = hwmon_device_register(&pdev->dev); + if (IS_ERR(data->class_dev)) { + err = PTR_ERR(data->class_dev); + dev_err(&pdev->dev, "Class registration failed (%d)\n", err); + goto exit_remove_files; + } + + return 0; + +exit_remove_files: + for (i = 0; i < 8; i++) { + if (!(data->fan_enabled & (1 << i))) + continue; + sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]); + } +exit_kfree: + platform_set_drvdata(pdev, NULL); + kfree(data); +exit: + return err; +} + +static int __devexit pc87427_remove(struct platform_device *pdev) +{ + struct pc87427_data *data = platform_get_drvdata(pdev); + int i; + + platform_set_drvdata(pdev, NULL); + hwmon_device_unregister(data->class_dev); + device_remove_file(&pdev->dev, &dev_attr_name); + for (i = 0; i < 8; i++) { + if (!(data->fan_enabled & (1 << i))) + continue; + sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]); + } + kfree(data); + + return 0; +} + + +static struct platform_driver pc87427_driver = { + .driver = { + .owner = THIS_MODULE, + .name = DRVNAME, + }, + .probe = pc87427_probe, + .remove = __devexit_p(pc87427_remove), +}; + +static int __init pc87427_device_add(unsigned short address) +{ + struct resource res = { + .start = address, + .end = address + REGION_LENGTH - 1, + .name = logdev_str[0], + .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 pc87427_find(int sioaddr, unsigned short *address) +{ + u16 val; + int i, err = 0; + + /* Identify device */ + val = superio_inb(sioaddr, SIOREG_DEVID); + if (val != 0xf2) { /* PC87427 */ + err = -ENODEV; + goto exit; + } + + for (i = 0; i < 2; i++) { + address[i] = 0; + /* Select logical device */ + superio_outb(sioaddr, SIOREG_LDSEL, logdev[i]); + + val = superio_inb(sioaddr, SIOREG_ACT); + if (!(val & 0x01)) { + printk(KERN_INFO DRVNAME ": Logical device 0x%02x " + "not activated\n", logdev[i]); + continue; + } + + val = superio_inb(sioaddr, SIOREG_MAP); + if (val & 0x01) { + printk(KERN_WARNING DRVNAME ": Logical device 0x%02x " + "is memory-mapped, can't use\n", logdev[i]); + continue; + } + + val = (superio_inb(sioaddr, SIOREG_IOBASE) << 8) + | superio_inb(sioaddr, SIOREG_IOBASE + 1); + if (!val) { + printk(KERN_INFO DRVNAME ": I/O base address not set " + "for logical device 0x%02x\n", logdev[i]); + continue; + } + address[i] = val; + } + +exit: + superio_exit(sioaddr); + return err; +} + +static int __init pc87427_init(void) +{ + int err; + unsigned short address[2]; + + if (pc87427_find(0x2e, address) + && pc87427_find(0x4e, address)) + return -ENODEV; + + /* For now the driver only handles fans so we only care about the + first address. */ + if (!address[0]) + return -ENODEV; + + err = platform_driver_register(&pc87427_driver); + if (err) + goto exit; + + /* Sets global pdev as a side effect */ + err = pc87427_device_add(address[0]); + if (err) + goto exit_driver; + + return 0; + +exit_driver: + platform_driver_unregister(&pc87427_driver); +exit: + return err; +} + +static void __exit pc87427_exit(void) +{ + platform_device_unregister(pdev); + platform_driver_unregister(&pc87427_driver); +} + +MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); +MODULE_DESCRIPTION("PC87427 hardware monitoring driver"); +MODULE_LICENSE("GPL"); + +module_init(pc87427_init); +module_exit(pc87427_exit); |