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![Jean Delvare](/assets/img/avatar_default.png)
The SMSC LPC47M997 Super-I/O chip seems to be compatible with the LPC47M192, so it is supported by the smsc47m1 driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
583 lines
17 KiB
C
583 lines
17 KiB
C
/*
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smsc47m1.c - Part of lm_sensors, Linux kernel modules
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for hardware monitoring
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Supports the SMSC LPC47B27x, LPC47M10x, LPC47M13x, LPC47M14x,
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LPC47M15x, LPC47M192 and LPC47M997 Super-I/O chips.
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Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
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Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
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Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
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and Jean Delvare
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/i2c-isa.h>
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#include <linux/hwmon.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <asm/io.h>
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/* Address is autodetected, there is no default value */
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static unsigned short address;
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/* Super-I/0 registers and commands */
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#define REG 0x2e /* The register to read/write */
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#define VAL 0x2f /* The value to read/write */
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static inline void
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superio_outb(int reg, int val)
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{
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outb(reg, REG);
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outb(val, VAL);
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}
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static inline int
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superio_inb(int reg)
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{
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outb(reg, REG);
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return inb(VAL);
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}
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/* logical device for fans is 0x0A */
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#define superio_select() superio_outb(0x07, 0x0A)
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static inline void
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superio_enter(void)
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{
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outb(0x55, REG);
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}
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static inline void
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superio_exit(void)
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{
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outb(0xAA, REG);
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}
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#define SUPERIO_REG_ACT 0x30
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#define SUPERIO_REG_BASE 0x60
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#define SUPERIO_REG_DEVID 0x20
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/* Logical device registers */
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#define SMSC_EXTENT 0x80
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/* nr is 0 or 1 in the macros below */
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#define SMSC47M1_REG_ALARM 0x04
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#define SMSC47M1_REG_TPIN(nr) (0x34 - (nr))
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#define SMSC47M1_REG_PPIN(nr) (0x36 - (nr))
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#define SMSC47M1_REG_PWM(nr) (0x56 + (nr))
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#define SMSC47M1_REG_FANDIV 0x58
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#define SMSC47M1_REG_FAN(nr) (0x59 + (nr))
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#define SMSC47M1_REG_FAN_PRELOAD(nr) (0x5B + (nr))
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#define MIN_FROM_REG(reg,div) ((reg)>=192 ? 0 : \
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983040/((192-(reg))*(div)))
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#define FAN_FROM_REG(reg,div,preload) ((reg)<=(preload) || (reg)==255 ? 0 : \
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983040/(((reg)-(preload))*(div)))
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#define DIV_FROM_REG(reg) (1 << (reg))
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#define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1)
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#define PWM_EN_FROM_REG(reg) ((~(reg)) & 0x01)
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#define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E)
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struct smsc47m1_data {
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struct i2c_client client;
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struct class_device *class_dev;
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struct semaphore lock;
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struct semaphore update_lock;
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unsigned long last_updated; /* In jiffies */
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u8 fan[2]; /* Register value */
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u8 fan_preload[2]; /* Register value */
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u8 fan_div[2]; /* Register encoding, shifted right */
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u8 alarms; /* Register encoding */
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u8 pwm[2]; /* Register value (bit 7 is enable) */
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};
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static int smsc47m1_detect(struct i2c_adapter *adapter);
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static int smsc47m1_detach_client(struct i2c_client *client);
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static int smsc47m1_read_value(struct i2c_client *client, u8 reg);
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static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value);
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static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
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int init);
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static struct i2c_driver smsc47m1_driver = {
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.owner = THIS_MODULE,
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.name = "smsc47m1",
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.attach_adapter = smsc47m1_detect,
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.detach_client = smsc47m1_detach_client,
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};
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/* nr is 0 or 1 in the callback functions below */
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static ssize_t get_fan(struct device *dev, char *buf, int nr)
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{
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struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
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/* This chip (stupidly) stops monitoring fan speed if PWM is
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enabled and duty cycle is 0%. This is fine if the monitoring
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and control concern the same fan, but troublesome if they are
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not (which could as well happen). */
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int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
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FAN_FROM_REG(data->fan[nr],
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DIV_FROM_REG(data->fan_div[nr]),
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data->fan_preload[nr]);
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return sprintf(buf, "%d\n", rpm);
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}
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static ssize_t get_fan_min(struct device *dev, char *buf, int nr)
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{
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struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
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int rpm = MIN_FROM_REG(data->fan_preload[nr],
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DIV_FROM_REG(data->fan_div[nr]));
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return sprintf(buf, "%d\n", rpm);
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}
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static ssize_t get_fan_div(struct device *dev, char *buf, int nr)
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{
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struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
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return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
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}
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static ssize_t get_pwm(struct device *dev, char *buf, int nr)
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{
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struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
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return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[nr]));
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}
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static ssize_t get_pwm_en(struct device *dev, char *buf, int nr)
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{
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struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
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return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[nr]));
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}
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static ssize_t get_alarms(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
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return sprintf(buf, "%d\n", data->alarms);
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}
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static ssize_t set_fan_min(struct device *dev, const char *buf,
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size_t count, int nr)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct smsc47m1_data *data = i2c_get_clientdata(client);
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long rpmdiv, val = simple_strtol(buf, NULL, 10);
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down(&data->update_lock);
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rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
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if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
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up(&data->update_lock);
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return -EINVAL;
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}
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data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
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smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD(nr),
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data->fan_preload[nr]);
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up(&data->update_lock);
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return count;
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}
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/* Note: we save and restore the fan minimum here, because its value is
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determined in part by the fan clock divider. This follows the principle
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of least suprise; the user doesn't expect the fan minimum to change just
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because the divider changed. */
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static ssize_t set_fan_div(struct device *dev, const char *buf,
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size_t count, int nr)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct smsc47m1_data *data = i2c_get_clientdata(client);
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long new_div = simple_strtol(buf, NULL, 10), tmp;
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u8 old_div = DIV_FROM_REG(data->fan_div[nr]);
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if (new_div == old_div) /* No change */
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return count;
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down(&data->update_lock);
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switch (new_div) {
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case 1: data->fan_div[nr] = 0; break;
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case 2: data->fan_div[nr] = 1; break;
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case 4: data->fan_div[nr] = 2; break;
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case 8: data->fan_div[nr] = 3; break;
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default:
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up(&data->update_lock);
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return -EINVAL;
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}
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tmp = smsc47m1_read_value(client, SMSC47M1_REG_FANDIV) & 0x0F;
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tmp |= (data->fan_div[0] << 4) | (data->fan_div[1] << 6);
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smsc47m1_write_value(client, SMSC47M1_REG_FANDIV, tmp);
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/* Preserve fan min */
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tmp = 192 - (old_div * (192 - data->fan_preload[nr])
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+ new_div / 2) / new_div;
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data->fan_preload[nr] = SENSORS_LIMIT(tmp, 0, 191);
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smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD(nr),
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data->fan_preload[nr]);
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up(&data->update_lock);
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return count;
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}
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static ssize_t set_pwm(struct device *dev, const char *buf,
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size_t count, int nr)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct smsc47m1_data *data = i2c_get_clientdata(client);
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long val = simple_strtol(buf, NULL, 10);
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if (val < 0 || val > 255)
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return -EINVAL;
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down(&data->update_lock);
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data->pwm[nr] &= 0x81; /* Preserve additional bits */
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data->pwm[nr] |= PWM_TO_REG(val);
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smsc47m1_write_value(client, SMSC47M1_REG_PWM(nr),
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data->pwm[nr]);
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up(&data->update_lock);
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return count;
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}
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static ssize_t set_pwm_en(struct device *dev, const char *buf,
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size_t count, int nr)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct smsc47m1_data *data = i2c_get_clientdata(client);
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long val = simple_strtol(buf, NULL, 10);
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if (val != 0 && val != 1)
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return -EINVAL;
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down(&data->update_lock);
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data->pwm[nr] &= 0xFE; /* preserve the other bits */
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data->pwm[nr] |= !val;
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smsc47m1_write_value(client, SMSC47M1_REG_PWM(nr),
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data->pwm[nr]);
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up(&data->update_lock);
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return count;
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}
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#define fan_present(offset) \
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static ssize_t get_fan##offset (struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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return get_fan(dev, buf, offset - 1); \
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} \
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static ssize_t get_fan##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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return get_fan_min(dev, buf, offset - 1); \
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} \
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static ssize_t set_fan##offset##_min (struct device *dev, struct device_attribute *attr, \
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const char *buf, size_t count) \
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{ \
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return set_fan_min(dev, buf, count, offset - 1); \
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} \
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static ssize_t get_fan##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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return get_fan_div(dev, buf, offset - 1); \
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} \
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static ssize_t set_fan##offset##_div (struct device *dev, struct device_attribute *attr, \
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const char *buf, size_t count) \
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{ \
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return set_fan_div(dev, buf, count, offset - 1); \
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} \
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static ssize_t get_pwm##offset (struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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return get_pwm(dev, buf, offset - 1); \
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} \
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static ssize_t set_pwm##offset (struct device *dev, struct device_attribute *attr, \
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const char *buf, size_t count) \
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{ \
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return set_pwm(dev, buf, count, offset - 1); \
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} \
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static ssize_t get_pwm##offset##_en (struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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return get_pwm_en(dev, buf, offset - 1); \
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} \
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static ssize_t set_pwm##offset##_en (struct device *dev, struct device_attribute *attr, \
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const char *buf, size_t count) \
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{ \
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return set_pwm_en(dev, buf, count, offset - 1); \
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} \
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static DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan##offset, \
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NULL); \
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static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
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get_fan##offset##_min, set_fan##offset##_min); \
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static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
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get_fan##offset##_div, set_fan##offset##_div); \
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static DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \
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get_pwm##offset, set_pwm##offset); \
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static DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \
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get_pwm##offset##_en, set_pwm##offset##_en);
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fan_present(1);
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fan_present(2);
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static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);
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static int __init smsc47m1_find(unsigned short *addr)
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{
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u8 val;
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superio_enter();
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val = superio_inb(SUPERIO_REG_DEVID);
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|
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/*
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* SMSC LPC47M10x/LPC47M13x (device id 0x59), LPC47M14x (device id
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* 0x5F) and LPC47B27x (device id 0x51) have fan control.
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* The LPC47M15x and LPC47M192 chips "with hardware monitoring block"
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* can do much more besides (device id 0x60).
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* The LPC47M997 is undocumented, but seems to be compatible with
|
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* the LPC47M192, and has the same device id.
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*/
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if (val == 0x51)
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printk(KERN_INFO "smsc47m1: Found SMSC LPC47B27x\n");
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else if (val == 0x59)
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printk(KERN_INFO "smsc47m1: Found SMSC LPC47M10x/LPC47M13x\n");
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else if (val == 0x5F)
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printk(KERN_INFO "smsc47m1: Found SMSC LPC47M14x\n");
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else if (val == 0x60)
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printk(KERN_INFO "smsc47m1: Found SMSC "
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"LPC47M15x/LPC47M192/LPC47M997\n");
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else {
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superio_exit();
|
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return -ENODEV;
|
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}
|
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|
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superio_select();
|
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*addr = (superio_inb(SUPERIO_REG_BASE) << 8)
|
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| superio_inb(SUPERIO_REG_BASE + 1);
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val = superio_inb(SUPERIO_REG_ACT);
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if (*addr == 0 || (val & 0x01) == 0) {
|
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printk(KERN_INFO "smsc47m1: Device is disabled, will not use\n");
|
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superio_exit();
|
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return -ENODEV;
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}
|
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|
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superio_exit();
|
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return 0;
|
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}
|
|
|
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static int smsc47m1_detect(struct i2c_adapter *adapter)
|
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{
|
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struct i2c_client *new_client;
|
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struct smsc47m1_data *data;
|
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int err = 0;
|
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int fan1, fan2, pwm1, pwm2;
|
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|
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if (!request_region(address, SMSC_EXTENT, smsc47m1_driver.name)) {
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dev_err(&adapter->dev, "Region 0x%x already in use!\n", address);
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return -EBUSY;
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}
|
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|
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if (!(data = kzalloc(sizeof(struct smsc47m1_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto error_release;
|
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}
|
|
|
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new_client = &data->client;
|
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i2c_set_clientdata(new_client, data);
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new_client->addr = address;
|
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init_MUTEX(&data->lock);
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new_client->adapter = adapter;
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new_client->driver = &smsc47m1_driver;
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|
new_client->flags = 0;
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|
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strlcpy(new_client->name, "smsc47m1", I2C_NAME_SIZE);
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init_MUTEX(&data->update_lock);
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|
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/* If no function is properly configured, there's no point in
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actually registering the chip. */
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fan1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(0)) & 0x05)
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== 0x05;
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fan2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(1)) & 0x05)
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== 0x05;
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pwm1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_PPIN(0)) & 0x05)
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== 0x04;
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pwm2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_PPIN(1)) & 0x05)
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== 0x04;
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if (!(fan1 || fan2 || pwm1 || pwm2)) {
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dev_warn(&new_client->dev, "Device is not configured, will not use\n");
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err = -ENODEV;
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goto error_free;
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|
}
|
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|
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if ((err = i2c_attach_client(new_client)))
|
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goto error_free;
|
|
|
|
/* Some values (fan min, clock dividers, pwm registers) may be
|
|
needed before any update is triggered, so we better read them
|
|
at least once here. We don't usually do it that way, but in
|
|
this particular case, manually reading 5 registers out of 8
|
|
doesn't make much sense and we're better using the existing
|
|
function. */
|
|
smsc47m1_update_device(&new_client->dev, 1);
|
|
|
|
/* Register sysfs hooks */
|
|
data->class_dev = hwmon_device_register(&new_client->dev);
|
|
if (IS_ERR(data->class_dev)) {
|
|
err = PTR_ERR(data->class_dev);
|
|
goto error_detach;
|
|
}
|
|
|
|
if (fan1) {
|
|
device_create_file(&new_client->dev, &dev_attr_fan1_input);
|
|
device_create_file(&new_client->dev, &dev_attr_fan1_min);
|
|
device_create_file(&new_client->dev, &dev_attr_fan1_div);
|
|
} else
|
|
dev_dbg(&new_client->dev, "Fan 1 not enabled by hardware, "
|
|
"skipping\n");
|
|
|
|
if (fan2) {
|
|
device_create_file(&new_client->dev, &dev_attr_fan2_input);
|
|
device_create_file(&new_client->dev, &dev_attr_fan2_min);
|
|
device_create_file(&new_client->dev, &dev_attr_fan2_div);
|
|
} else
|
|
dev_dbg(&new_client->dev, "Fan 2 not enabled by hardware, "
|
|
"skipping\n");
|
|
|
|
if (pwm1) {
|
|
device_create_file(&new_client->dev, &dev_attr_pwm1);
|
|
device_create_file(&new_client->dev, &dev_attr_pwm1_enable);
|
|
} else
|
|
dev_dbg(&new_client->dev, "PWM 1 not enabled by hardware, "
|
|
"skipping\n");
|
|
if (pwm2) {
|
|
device_create_file(&new_client->dev, &dev_attr_pwm2);
|
|
device_create_file(&new_client->dev, &dev_attr_pwm2_enable);
|
|
} else
|
|
dev_dbg(&new_client->dev, "PWM 2 not enabled by hardware, "
|
|
"skipping\n");
|
|
|
|
device_create_file(&new_client->dev, &dev_attr_alarms);
|
|
|
|
return 0;
|
|
|
|
error_detach:
|
|
i2c_detach_client(new_client);
|
|
error_free:
|
|
kfree(data);
|
|
error_release:
|
|
release_region(address, SMSC_EXTENT);
|
|
return err;
|
|
}
|
|
|
|
static int smsc47m1_detach_client(struct i2c_client *client)
|
|
{
|
|
struct smsc47m1_data *data = i2c_get_clientdata(client);
|
|
int err;
|
|
|
|
hwmon_device_unregister(data->class_dev);
|
|
|
|
if ((err = i2c_detach_client(client)))
|
|
return err;
|
|
|
|
release_region(client->addr, SMSC_EXTENT);
|
|
kfree(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smsc47m1_read_value(struct i2c_client *client, u8 reg)
|
|
{
|
|
int res;
|
|
|
|
down(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
|
|
res = inb_p(client->addr + reg);
|
|
up(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
|
|
return res;
|
|
}
|
|
|
|
static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value)
|
|
{
|
|
down(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
|
|
outb_p(value, client->addr + reg);
|
|
up(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
|
|
}
|
|
|
|
static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
|
|
int init)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct smsc47m1_data *data = i2c_get_clientdata(client);
|
|
|
|
down(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
|
|
int i;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
data->fan[i] = smsc47m1_read_value(client,
|
|
SMSC47M1_REG_FAN(i));
|
|
data->fan_preload[i] = smsc47m1_read_value(client,
|
|
SMSC47M1_REG_FAN_PRELOAD(i));
|
|
data->pwm[i] = smsc47m1_read_value(client,
|
|
SMSC47M1_REG_PWM(i));
|
|
}
|
|
|
|
i = smsc47m1_read_value(client, SMSC47M1_REG_FANDIV);
|
|
data->fan_div[0] = (i >> 4) & 0x03;
|
|
data->fan_div[1] = i >> 6;
|
|
|
|
data->alarms = smsc47m1_read_value(client,
|
|
SMSC47M1_REG_ALARM) >> 6;
|
|
/* Clear alarms if needed */
|
|
if (data->alarms)
|
|
smsc47m1_write_value(client, SMSC47M1_REG_ALARM, 0xC0);
|
|
|
|
data->last_updated = jiffies;
|
|
}
|
|
|
|
up(&data->update_lock);
|
|
return data;
|
|
}
|
|
|
|
static int __init sm_smsc47m1_init(void)
|
|
{
|
|
if (smsc47m1_find(&address)) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
return i2c_isa_add_driver(&smsc47m1_driver);
|
|
}
|
|
|
|
static void __exit sm_smsc47m1_exit(void)
|
|
{
|
|
i2c_isa_del_driver(&smsc47m1_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
|
|
MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(sm_smsc47m1_init);
|
|
module_exit(sm_smsc47m1_exit);
|