--- /dev/null
+/*
+ smsc47m1.c - Part of lm_sensors, Linux kernel modules
+ for hardware monitoring
+
+ Supports the SMSC LPC47B27x, LPC47M10x, LPC47M13x, LPC47M14x,
+ LPC47M15x, LPC47M192 and LPC47M997 Super-I/O chips.
+
+ Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
+ Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
+ Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
+ and Jean Delvare
+
+ 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/i2c.h>
+#include <linux/i2c-isa.h>
+#include <linux/hwmon.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <asm/io.h>
+
+/* Address is autodetected, there is no default value */
+static unsigned short address;
+
+/* 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);
+}
+
+/* logical device for fans is 0x0A */
+#define superio_select() superio_outb(0x07, 0x0A)
+
+static inline void
+superio_enter(void)
+{
+ outb(0x55, REG);
+}
+
+static inline void
+superio_exit(void)
+{
+ outb(0xAA, REG);
+}
+
+#define SUPERIO_REG_ACT 0x30
+#define SUPERIO_REG_BASE 0x60
+#define SUPERIO_REG_DEVID 0x20
+
+/* Logical device registers */
+
+#define SMSC_EXTENT 0x80
+
+/* nr is 0 or 1 in the macros below */
+#define SMSC47M1_REG_ALARM 0x04
+#define SMSC47M1_REG_TPIN(nr) (0x34 - (nr))
+#define SMSC47M1_REG_PPIN(nr) (0x36 - (nr))
+#define SMSC47M1_REG_PWM(nr) (0x56 + (nr))
+#define SMSC47M1_REG_FANDIV 0x58
+#define SMSC47M1_REG_FAN(nr) (0x59 + (nr))
+#define SMSC47M1_REG_FAN_PRELOAD(nr) (0x5B + (nr))
+
+#define MIN_FROM_REG(reg,div) ((reg)>=192 ? 0 : \
+ 983040/((192-(reg))*(div)))
+#define FAN_FROM_REG(reg,div,preload) ((reg)<=(preload) || (reg)==255 ? 0 : \
+ 983040/(((reg)-(preload))*(div)))
+#define DIV_FROM_REG(reg) (1 << (reg))
+#define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1)
+#define PWM_EN_FROM_REG(reg) ((~(reg)) & 0x01)
+#define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E)
+
+struct smsc47m1_data {
+ struct i2c_client client;
+ struct class_device *class_dev;
+ struct mutex lock;
+
+ struct mutex update_lock;
+ unsigned long last_updated; /* In jiffies */
+
+ u8 fan[2]; /* Register value */
+ u8 fan_preload[2]; /* Register value */
+ u8 fan_div[2]; /* Register encoding, shifted right */
+ u8 alarms; /* Register encoding */
+ u8 pwm[2]; /* Register value (bit 7 is enable) */
+};
+
+
+static int smsc47m1_detect(struct i2c_adapter *adapter);
+static int smsc47m1_detach_client(struct i2c_client *client);
+
+static int smsc47m1_read_value(struct i2c_client *client, u8 reg);
+static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value);
+
+static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
+ int init);
+
+
+static struct i2c_driver smsc47m1_driver = {
+ .driver = {
+ .name = "smsc47m1",
+ },
+ .attach_adapter = smsc47m1_detect,
+ .detach_client = smsc47m1_detach_client,
+};
+
+/* nr is 0 or 1 in the callback functions below */
+
+static ssize_t get_fan(struct device *dev, char *buf, int nr)
+{
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ /* This chip (stupidly) stops monitoring fan speed if PWM is
+ enabled and duty cycle is 0%. This is fine if the monitoring
+ and control concern the same fan, but troublesome if they are
+ not (which could as well happen). */
+ int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
+ FAN_FROM_REG(data->fan[nr],
+ DIV_FROM_REG(data->fan_div[nr]),
+ data->fan_preload[nr]);
+ return sprintf(buf, "%d\n", rpm);
+}
+
+static ssize_t get_fan_min(struct device *dev, char *buf, int nr)
+{
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ int rpm = MIN_FROM_REG(data->fan_preload[nr],
+ DIV_FROM_REG(data->fan_div[nr]));
+ return sprintf(buf, "%d\n", rpm);
+}
+
+static ssize_t get_fan_div(struct device *dev, char *buf, int nr)
+{
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
+}
+
+static ssize_t get_pwm(struct device *dev, char *buf, int nr)
+{
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[nr]));
+}
+
+static ssize_t get_pwm_en(struct device *dev, char *buf, int nr)
+{
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[nr]));
+}
+
+static ssize_t get_alarms(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
+ return sprintf(buf, "%d\n", data->alarms);
+}
+
+static ssize_t set_fan_min(struct device *dev, const char *buf,
+ size_t count, int nr)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct smsc47m1_data *data = i2c_get_clientdata(client);
+ long rpmdiv, val = simple_strtol(buf, NULL, 10);
+
+ mutex_lock(&data->update_lock);
+ rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
+
+ if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
+ mutex_unlock(&data->update_lock);
+ return -EINVAL;
+ }
+
+ data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
+ smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD(nr),
+ data->fan_preload[nr]);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+/* Note: we save and restore the fan minimum here, because its value is
+ determined in part by the fan clock divider. This follows the principle
+ of least suprise; the user doesn't expect the fan minimum to change just
+ because the divider changed. */
+static ssize_t set_fan_div(struct device *dev, const char *buf,
+ size_t count, int nr)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct smsc47m1_data *data = i2c_get_clientdata(client);
+
+ long new_div = simple_strtol(buf, NULL, 10), tmp;
+ u8 old_div = DIV_FROM_REG(data->fan_div[nr]);
+
+ if (new_div == old_div) /* No change */
+ return count;
+
+ mutex_lock(&data->update_lock);
+ switch (new_div) {
+ case 1: data->fan_div[nr] = 0; break;
+ case 2: data->fan_div[nr] = 1; break;
+ case 4: data->fan_div[nr] = 2; break;
+ case 8: data->fan_div[nr] = 3; break;
+ default:
+ mutex_unlock(&data->update_lock);
+ return -EINVAL;
+ }
+
+ tmp = smsc47m1_read_value(client, SMSC47M1_REG_FANDIV) & 0x0F;
+ tmp |= (data->fan_div[0] << 4) | (data->fan_div[1] << 6);
+ smsc47m1_write_value(client, SMSC47M1_REG_FANDIV, tmp);
+
+ /* Preserve fan min */
+ tmp = 192 - (old_div * (192 - data->fan_preload[nr])
+ + new_div / 2) / new_div;
+ data->fan_preload[nr] = SENSORS_LIMIT(tmp, 0, 191);
+ smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD(nr),
+ data->fan_preload[nr]);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t set_pwm(struct device *dev, const char *buf,
+ size_t count, int nr)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct smsc47m1_data *data = i2c_get_clientdata(client);
+
+ long val = simple_strtol(buf, NULL, 10);
+
+ if (val < 0 || val > 255)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ data->pwm[nr] &= 0x81; /* Preserve additional bits */
+ data->pwm[nr] |= PWM_TO_REG(val);
+ smsc47m1_write_value(client, SMSC47M1_REG_PWM(nr),
+ data->pwm[nr]);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+static ssize_t set_pwm_en(struct device *dev, const char *buf,
+ size_t count, int nr)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct smsc47m1_data *data = i2c_get_clientdata(client);
+
+ long val = simple_strtol(buf, NULL, 10);
+
+ if (val != 0 && val != 1)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ data->pwm[nr] &= 0xFE; /* preserve the other bits */
+ data->pwm[nr] |= !val;
+ smsc47m1_write_value(client, SMSC47M1_REG_PWM(nr),
+ data->pwm[nr]);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+#define fan_present(offset) \
+static ssize_t get_fan##offset (struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+ return get_fan(dev, buf, offset - 1); \
+} \
+static ssize_t get_fan##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+ return get_fan_min(dev, buf, offset - 1); \
+} \
+static ssize_t set_fan##offset##_min (struct device *dev, struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ return set_fan_min(dev, buf, count, offset - 1); \
+} \
+static ssize_t get_fan##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+ return get_fan_div(dev, buf, offset - 1); \
+} \
+static ssize_t set_fan##offset##_div (struct device *dev, struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ return set_fan_div(dev, buf, count, offset - 1); \
+} \
+static ssize_t get_pwm##offset (struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+ return get_pwm(dev, buf, offset - 1); \
+} \
+static ssize_t set_pwm##offset (struct device *dev, struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ return set_pwm(dev, buf, count, offset - 1); \
+} \
+static ssize_t get_pwm##offset##_en (struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+ return get_pwm_en(dev, buf, offset - 1); \
+} \
+static ssize_t set_pwm##offset##_en (struct device *dev, struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ return set_pwm_en(dev, buf, count, offset - 1); \
+} \
+static DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan##offset, \
+ NULL); \
+static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
+ get_fan##offset##_min, set_fan##offset##_min); \
+static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
+ get_fan##offset##_div, set_fan##offset##_div); \
+static DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \
+ get_pwm##offset, set_pwm##offset); \
+static DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \
+ get_pwm##offset##_en, set_pwm##offset##_en);
+
+fan_present(1);
+fan_present(2);
+
+static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);
+
+static int __init smsc47m1_find(unsigned short *addr)
+{
+ u8 val;
+
+ superio_enter();
+ val = superio_inb(SUPERIO_REG_DEVID);
+
+ /*
+ * SMSC LPC47M10x/LPC47M13x (device id 0x59), LPC47M14x (device id
+ * 0x5F) and LPC47B27x (device id 0x51) have fan control.
+ * The LPC47M15x and LPC47M192 chips "with hardware monitoring block"
+ * can do much more besides (device id 0x60).
+ * The LPC47M997 is undocumented, but seems to be compatible with
+ * the LPC47M192, and has the same device id.
+ */
+ if (val == 0x51)
+ printk(KERN_INFO "smsc47m1: Found SMSC LPC47B27x\n");
+ else if (val == 0x59)
+ printk(KERN_INFO "smsc47m1: Found SMSC LPC47M10x/LPC47M13x\n");
+ else if (val == 0x5F)
+ printk(KERN_INFO "smsc47m1: Found SMSC LPC47M14x\n");
+ else if (val == 0x60)
+ printk(KERN_INFO "smsc47m1: Found SMSC "
+ "LPC47M15x/LPC47M192/LPC47M997\n");
+ else {
+ superio_exit();
+ return -ENODEV;
+ }
+
+ superio_select();
+ *addr = (superio_inb(SUPERIO_REG_BASE) << 8)
+ | superio_inb(SUPERIO_REG_BASE + 1);
+ val = superio_inb(SUPERIO_REG_ACT);
+ if (*addr == 0 || (val & 0x01) == 0) {
+ printk(KERN_INFO "smsc47m1: Device is disabled, will not use\n");
+ superio_exit();
+ return -ENODEV;
+ }
+
+ superio_exit();
+ return 0;
+}
+
+static int smsc47m1_detect(struct i2c_adapter *adapter)
+{
+ struct i2c_client *new_client;
+ struct smsc47m1_data *data;
+ int err = 0;
+ int fan1, fan2, pwm1, pwm2;
+
+ if (!request_region(address, SMSC_EXTENT, smsc47m1_driver.driver.name)) {
+ dev_err(&adapter->dev, "Region 0x%x already in use!\n", address);
+ return -EBUSY;
+ }
+
+ if (!(data = kzalloc(sizeof(struct smsc47m1_data), GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto error_release;
+ }
+
+ new_client = &data->client;
+ i2c_set_clientdata(new_client, data);
+ new_client->addr = address;
+ mutex_init(&data->lock);
+ new_client->adapter = adapter;
+ new_client->driver = &smsc47m1_driver;
+ new_client->flags = 0;
+
+ strlcpy(new_client->name, "smsc47m1", I2C_NAME_SIZE);
+ mutex_init(&data->update_lock);
+
+ /* If no function is properly configured, there's no point in
+ actually registering the chip. */
+ fan1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(0)) & 0x05)
+ == 0x05;
+ fan2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(1)) & 0x05)
+ == 0x05;
+ pwm1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_PPIN(0)) & 0x05)
+ == 0x04;
+ pwm2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_PPIN(1)) & 0x05)
+ == 0x04;
+ if (!(fan1 || fan2 || pwm1 || pwm2)) {
+ dev_warn(&new_client->dev, "Device is not configured, will not use\n");
+ err = -ENODEV;
+ goto error_free;
+ }
+
+ if ((err = i2c_attach_client(new_client)))
+ 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;
+
+ mutex_lock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
+ res = inb_p(client->addr + reg);
+ mutex_unlock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
+ return res;
+}
+
+static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value)
+{
+ mutex_lock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
+ outb_p(value, client->addr + reg);
+ mutex_unlock(&((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);
+
+ mutex_lock(&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;
+ }
+
+ mutex_unlock(&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);
git://git.onelab.eu / linux-2.6.git / blobdiff