diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/Kconfig | 3 | ||||
| -rw-r--r-- | drivers/hwmon/pc87427.c | 271 |
2 files changed, 271 insertions, 3 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index d50e9fa..ea3d8df 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -711,7 +711,8 @@ config SENSORS_PC87427 functions of the National Semiconductor PC87427 Super-I/O chip. The chip has two distinct logical devices, one for fan speed monitoring and control, and one for voltage and temperature - monitoring. Only fan speed monitoring is supported right now. + monitoring. Only fan speed monitoring and control is supported + right now. This driver can also be built as a module. If so, the module will be called pc87427. diff --git a/drivers/hwmon/pc87427.c b/drivers/hwmon/pc87427.c index 0ac55ba..8698227 100644 --- a/drivers/hwmon/pc87427.c +++ b/drivers/hwmon/pc87427.c @@ -15,10 +15,10 @@ * Supports the following chips: * * Chip #vin #fan #pwm #temp devid - * PC87427 - 8 - - 0xF2 + * PC87427 - 8 4 - 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. + * Only fans are supported so far, although the chip can do much more. */ #include <linux/module.h> @@ -57,10 +57,16 @@ struct pc87427_data { u16 fan[8]; /* register values */ u16 fan_min[8]; /* register values */ u8 fan_status[8]; /* register values */ + + u8 pwm_enabled; /* bit vector */ + u8 pwm_auto_ok; /* bit vector */ + u8 pwm_enable[4]; /* register values */ + u8 pwm[4]; /* register values */ }; struct pc87427_sio_data { u8 has_fanin; + u8 has_fanout; }; /* @@ -72,7 +78,9 @@ struct pc87427_sio_data { #define SIOREG_CF2 0x22 /* Configuration 2 */ #define SIOREG_CF3 0x23 /* Configuration 3 */ #define SIOREG_CF4 0x24 /* Configuration 4 */ +#define SIOREG_CF5 0x25 /* Configuration 5 */ #define SIOREG_CFB 0x2B /* Configuration B */ +#define SIOREG_CFC 0x2C /* Configuration C */ #define SIOREG_CFD 0x2D /* Configuration D */ #define SIOREG_ACT 0x30 /* Device activation */ #define SIOREG_MAP 0x50 /* I/O or memory mapping */ @@ -188,6 +196,61 @@ static inline u16 fan_to_reg(unsigned long val) } /* + * PWM registers and conversions + */ + +#define PC87427_REG_PWM_ENABLE 0x10 +#define PC87427_REG_PWM_DUTY 0x12 + +#define PWM_ENABLE_MODE_MASK (7 << 4) +#define PWM_ENABLE_CTLEN (1 << 0) + +#define PWM_MODE_MANUAL (0 << 4) +#define PWM_MODE_AUTO (1 << 4) +#define PWM_MODE_OFF (2 << 4) +#define PWM_MODE_ON (7 << 4) + +/* Dedicated function to read all registers related to a given PWM output. + This saves us quite a few locks and bank selections. + Must be called with data->lock held. + nr is from 0 to 3 */ +static void pc87427_readall_pwm(struct pc87427_data *data, u8 nr) +{ + int iobase = data->address[LD_FAN]; + + outb(BANK_FC(nr), iobase + PC87427_REG_BANK); + data->pwm_enable[nr] = inb(iobase + PC87427_REG_PWM_ENABLE); + data->pwm[nr] = inb(iobase + PC87427_REG_PWM_DUTY); +} + +static inline int pwm_enable_from_reg(u8 reg) +{ + switch (reg & PWM_ENABLE_MODE_MASK) { + case PWM_MODE_ON: + return 0; + case PWM_MODE_MANUAL: + case PWM_MODE_OFF: + return 1; + case PWM_MODE_AUTO: + return 2; + default: + return -EPROTO; + } +} + +static inline u8 pwm_enable_to_reg(unsigned long val, u8 pwmval) +{ + switch (val) { + default: + return PWM_MODE_ON; + case 1: + return pwmval ? PWM_MODE_MANUAL : PWM_MODE_OFF; + case 2: + return PWM_MODE_AUTO; + } +} + +/* * Data interface */ @@ -207,6 +270,14 @@ static struct pc87427_data *pc87427_update_device(struct device *dev) continue; pc87427_readall_fan(data, i); } + + /* PWM outputs */ + for (i = 0; i < 4; i++) { + if (!(data->pwm_enabled & (1 << i))) + continue; + pc87427_readall_pwm(data, i); + } + data->last_updated = jiffies; done: @@ -384,6 +455,145 @@ static const struct attribute_group pc87427_group_fan[8] = { { .attrs = pc87427_attributes_fan[7] }, }; +/* Must be called with data->lock held and pc87427_readall_pwm() freshly + called */ +static void update_pwm_enable(struct pc87427_data *data, int nr, u8 mode) +{ + int iobase = data->address[LD_FAN]; + data->pwm_enable[nr] &= ~PWM_ENABLE_MODE_MASK; + data->pwm_enable[nr] |= mode; + outb(data->pwm_enable[nr], iobase + PC87427_REG_PWM_ENABLE); +} + +static ssize_t show_pwm_enable(struct device *dev, struct device_attribute + *devattr, char *buf) +{ + struct pc87427_data *data = pc87427_update_device(dev); + int nr = to_sensor_dev_attr(devattr)->index; + int pwm_enable; + + pwm_enable = pwm_enable_from_reg(data->pwm_enable[nr]); + if (pwm_enable < 0) + return pwm_enable; + return sprintf(buf, "%d\n", pwm_enable); +} + +static ssize_t set_pwm_enable(struct device *dev, struct device_attribute + *devattr, const char *buf, size_t count) +{ + struct pc87427_data *data = dev_get_drvdata(dev); + int nr = to_sensor_dev_attr(devattr)->index; + unsigned long val; + + if (strict_strtoul(buf, 10, &val) < 0 || val > 2) + return -EINVAL; + /* Can't go to automatic mode if it isn't configured */ + if (val == 2 && !(data->pwm_auto_ok & (1 << nr))) + return -EINVAL; + + mutex_lock(&data->lock); + pc87427_readall_pwm(data, nr); + update_pwm_enable(data, nr, pwm_enable_to_reg(val, data->pwm[nr])); + mutex_unlock(&data->lock); + + return count; +} + +static ssize_t show_pwm(struct device *dev, struct device_attribute + *devattr, char *buf) +{ + struct pc87427_data *data = pc87427_update_device(dev); + int nr = to_sensor_dev_attr(devattr)->index; + + return sprintf(buf, "%d\n", (int)data->pwm[nr]); +} + +static ssize_t set_pwm(struct device *dev, struct device_attribute + *devattr, const char *buf, size_t count) +{ + struct pc87427_data *data = dev_get_drvdata(dev); + int nr = to_sensor_dev_attr(devattr)->index; + unsigned long val; + int iobase = data->address[LD_FAN]; + u8 mode; + + if (strict_strtoul(buf, 10, &val) < 0 || val > 0xff) + return -EINVAL; + + mutex_lock(&data->lock); + pc87427_readall_pwm(data, nr); + mode = data->pwm_enable[nr] & PWM_ENABLE_MODE_MASK; + if (mode != PWM_MODE_MANUAL && mode != PWM_MODE_OFF) { + dev_notice(dev, "Can't set PWM%d duty cycle while not in " + "manual mode\n", nr + 1); + mutex_unlock(&data->lock); + return -EPERM; + } + + /* We may have to change the mode */ + if (mode == PWM_MODE_MANUAL && val == 0) { + /* Transition from Manual to Off */ + update_pwm_enable(data, nr, PWM_MODE_OFF); + mode = PWM_MODE_OFF; + dev_dbg(dev, "Switching PWM%d from %s to %s\n", nr + 1, + "manual", "off"); + } else if (mode == PWM_MODE_OFF && val != 0) { + /* Transition from Off to Manual */ + update_pwm_enable(data, nr, PWM_MODE_MANUAL); + mode = PWM_MODE_MANUAL; + dev_dbg(dev, "Switching PWM%d from %s to %s\n", nr + 1, + "off", "manual"); + } + + data->pwm[nr] = val; + if (mode == PWM_MODE_MANUAL) + outb(val, iobase + PC87427_REG_PWM_DUTY); + mutex_unlock(&data->lock); + + return count; +} + +static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, + show_pwm_enable, set_pwm_enable, 0); +static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, + show_pwm_enable, set_pwm_enable, 1); +static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO, + show_pwm_enable, set_pwm_enable, 2); +static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO, + show_pwm_enable, set_pwm_enable, 3); + +static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0); +static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1); +static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 2); +static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 3); + +static struct attribute *pc87427_attributes_pwm[4][3] = { + { + &sensor_dev_attr_pwm1_enable.dev_attr.attr, + &sensor_dev_attr_pwm1.dev_attr.attr, + NULL + }, { + &sensor_dev_attr_pwm2_enable.dev_attr.attr, + &sensor_dev_attr_pwm2.dev_attr.attr, + NULL + }, { + &sensor_dev_attr_pwm3_enable.dev_attr.attr, + &sensor_dev_attr_pwm3.dev_attr.attr, + NULL + }, { + &sensor_dev_attr_pwm4_enable.dev_attr.attr, + &sensor_dev_attr_pwm4.dev_attr.attr, + NULL + } +}; + +static const struct attribute_group pc87427_group_pwm[4] = { + { .attrs = pc87427_attributes_pwm[0] }, + { .attrs = pc87427_attributes_pwm[1] }, + { .attrs = pc87427_attributes_pwm[2] }, + { .attrs = pc87427_attributes_pwm[3] }, +}; + static ssize_t show_name(struct device *dev, struct device_attribute *devattr, char *buf) { @@ -431,6 +641,25 @@ static void __devinit pc87427_init_device(struct device *dev) } data->fan_enabled = sio_data->has_fanin; } + + /* Check which PWM outputs are enabled */ + for (i = 0; i < 4; i++) { + if (!(sio_data->has_fanout & (1 << i))) /* Not wired */ + continue; + reg = pc87427_read8_bank(data, LD_FAN, BANK_FC(i), + PC87427_REG_PWM_ENABLE); + if (reg & PWM_ENABLE_CTLEN) + data->pwm_enabled |= (1 << i); + + /* We don't expose an interface to reconfigure the automatic + fan control mode, so only allow to return to this mode if + it was originally set. */ + if ((reg & PWM_ENABLE_MODE_MASK) == PWM_MODE_AUTO) { + dev_dbg(dev, "PWM%d is in automatic control mode\n", + i + 1); + data->pwm_auto_ok |= (1 << i); + } + } } static int __devinit pc87427_probe(struct platform_device *pdev) @@ -474,6 +703,14 @@ static int __devinit pc87427_probe(struct platform_device *pdev) if (err) goto exit_remove_files; } + for (i = 0; i < 4; i++) { + if (!(data->pwm_enabled & (1 << i))) + continue; + err = sysfs_create_group(&pdev->dev.kobj, + &pc87427_group_pwm[i]); + if (err) + goto exit_remove_files; + } data->hwmon_dev = hwmon_device_register(&pdev->dev); if (IS_ERR(data->hwmon_dev)) { @@ -490,6 +727,11 @@ exit_remove_files: continue; sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]); } + for (i = 0; i < 4; i++) { + if (!(data->pwm_enabled & (1 << i))) + continue; + sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_pwm[i]); + } exit_release_region: release_region(res->start, resource_size(res)); exit_kfree: @@ -512,6 +754,11 @@ static int __devexit pc87427_remove(struct platform_device *pdev) continue; sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]); } + for (i = 0; i < 4; i++) { + if (!(data->pwm_enabled & (1 << i))) + continue; + sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_pwm[i]); + } platform_set_drvdata(pdev, NULL); kfree(data); @@ -648,6 +895,26 @@ static int __init pc87427_find(int sioaddr, unsigned short *address, if ((cfg & (1 << 3)) && !(cfg_b & (1 << 5))) sio_data->has_fanin |= (1 << 6); /* FANIN6 */ + /* Check which fan outputs are wired */ + sio_data->has_fanout = (1 << 0); /* FANOUT0 */ + if (cfg_b & (1 << 0)) + sio_data->has_fanout |= (1 << 3); /* FANOUT3 */ + + cfg = superio_inb(sioaddr, SIOREG_CFC); + if (!(cfg & (1 << 4))) { + if (cfg_b & (1 << 1)) + sio_data->has_fanout |= (1 << 1); /* FANOUT1 */ + if (cfg_b & (1 << 2)) + sio_data->has_fanout |= (1 << 2); /* FANOUT2 */ + } + + /* FANOUT1 and FANOUT2 can each be routed to 2 different pins */ + cfg = superio_inb(sioaddr, SIOREG_CF5); + if (cfg & (1 << 6)) + sio_data->has_fanout |= (1 << 1); /* FANOUT1 */ + if (cfg & (1 << 5)) + sio_data->has_fanout |= (1 << 2); /* FANOUT2 */ + exit: superio_exit(sioaddr); return err; |