1 files changed, 591 insertions, 0 deletions

diff --git a/drivers/i2c/chips/smsc47m1.c b/drivers/i2c/chips/smsc47m1.c
new file mode 100644
index 000000000000..0e12ca369413
--- /dev/null
+++ b/drivers/i2c/chips/smsc47m1.c
@@ -0,0 +1,591 @@
+/*
+    smsc47m1.c - Part of lm_sensors, Linux kernel modules
+                 for hardware monitoring
+
+    Supports the SMSC LPC47B27x, LPC47M10x, LPC47M13x and LPC47M14x
+    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-sensor.h>
+#include <linux/init.h>
+#include <asm/io.h>
+
+static unsigned short normal_i2c[] = { I2C_CLIENT_END };
+/* Address is autodetected, there is no default value */
+static unsigned int normal_isa[] = { 0x0000, I2C_CLIENT_ISA_END };
+static struct i2c_force_data forces[] = {{NULL}};
+
+enum chips { any_chip, smsc47m1 };
+static struct i2c_address_data addr_data = {
+        .normal_i2c             = normal_i2c,
+        .normal_isa             = normal_isa,
+        .forces                 = forces,
+};
+
+/* 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 semaphore lock;
+
+        struct semaphore 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_attach_adapter(struct i2c_adapter *adapter);
+static int smsc47m1_find(int *address);
+static int smsc47m1_detect(struct i2c_adapter *adapter, int address, int kind);
+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 = {
+        .owner          = THIS_MODULE,
+        .name           = "smsc47m1",
+        .id             = I2C_DRIVERID_SMSC47M1,
+        .flags          = I2C_DF_NOTIFY,
+        .attach_adapter = smsc47m1_attach_adapter,
+        .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, 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);
+
+        down(&data->update_lock);
+        rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
+
+        if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
+                up(&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]);
+        up(&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;
+
+        down(&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:
+                up(&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]);
+        up(&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;
+
+        down(&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]);
+        up(&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;
+
+        down(&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]);
+        up(&data->update_lock);
+
+        return count;
+}
+
+#define fan_present(offset)                                             \
+static ssize_t get_fan##offset (struct device *dev, char *buf)          \
+{                                                                       \
+        return get_fan(dev, buf, offset - 1);                           \
+}                                                                       \
+static ssize_t get_fan##offset##_min (struct device *dev, char *buf)    \
+{                                                                       \
+        return get_fan_min(dev, buf, offset - 1);                       \
+}                                                                       \
+static ssize_t set_fan##offset##_min (struct device *dev,               \
+                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, char *buf)    \
+{                                                                       \
+        return get_fan_div(dev, buf, offset - 1);                       \
+}                                                                       \
+static ssize_t set_fan##offset##_div (struct device *dev,               \
+                const char *buf, size_t count)                          \
+{                                                                       \
+        return set_fan_div(dev, buf, count, offset - 1);                \
+}                                                                       \
+static ssize_t get_pwm##offset (struct device *dev, char *buf)          \
+{                                                                       \
+        return get_pwm(dev, buf, offset - 1);                           \
+}                                                                       \
+static ssize_t set_pwm##offset (struct device *dev,                     \
+                const char *buf, size_t count)                          \
+{                                                                       \
+        return set_pwm(dev, buf, count, offset - 1);                    \
+}                                                                       \
+static ssize_t get_pwm##offset##_en (struct device *dev, char *buf)     \
+{                                                                       \
+        return get_pwm_en(dev, buf, offset - 1);                        \
+}                                                                       \
+static ssize_t set_pwm##offset##_en (struct device *dev,                \
+                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 smsc47m1_attach_adapter(struct i2c_adapter *adapter)
+{
+        if (!(adapter->class & I2C_CLASS_HWMON))
+                return 0;
+        return i2c_detect(adapter, &addr_data, smsc47m1_detect);
+}
+
+static int smsc47m1_find(int *address)
+{
+        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, unsupported).
+         */
+        if (val == 0x51)
+                printk(KERN_INFO "smsc47m1: Found SMSC47B27x\n");
+        else if (val == 0x59)
+                printk(KERN_INFO "smsc47m1: Found SMSC47M10x/SMSC47M13x\n");
+        else if (val == 0x5F)
+                printk(KERN_INFO "smsc47m1: Found SMSC47M14x\n");
+        else {
+                superio_exit();
+                return -ENODEV;
+        }
+
+        superio_select();
+        *address = (superio_inb(SUPERIO_REG_BASE) << 8)
+                 |  superio_inb(SUPERIO_REG_BASE + 1);
+        val = superio_inb(SUPERIO_REG_ACT);
+        if (*address == 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, int address, int kind)
+{
+        struct i2c_client *new_client;
+        struct smsc47m1_data *data;
+        int err = 0;
+        int fan1, fan2, pwm1, pwm2;
+
+        if (!i2c_is_isa_adapter(adapter)) {
+                return 0;
+        }
+
+        if (!request_region(address, SMSC_EXTENT, smsc47m1_driver.name)) {
+                dev_err(&adapter->dev, "Region 0x%x already in use!\n", address);
+                return -EBUSY;
+        }
+
+        if (!(data = kmalloc(sizeof(struct smsc47m1_data), GFP_KERNEL))) {
+                err = -ENOMEM;
+                goto error_release;
+        }
+        memset(data, 0x00, sizeof(struct smsc47m1_data));
+
+        new_client = &data->client;
+        i2c_set_clientdata(new_client, data);
+        new_client->addr = address;
+        init_MUTEX(&data->lock);
+        new_client->adapter = adapter;
+        new_client->driver = &smsc47m1_driver;
+        new_client->flags = 0;
+
+        strlcpy(new_client->name, "smsc47m1", I2C_NAME_SIZE);
+        init_MUTEX(&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);
+
+        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_free:
+        kfree(new_client);
+error_release:
+        release_region(address, SMSC_EXTENT);
+        return err;
+}
+
+static int smsc47m1_detach_client(struct i2c_client *client)
+{
+        int err;
+
+        if ((err = i2c_detach_client(client))) {
+                dev_err(&client->dev, "Client deregistration failed, "
+                        "client not detached.\n");
+                return err;
+        }
+
+        release_region(client->addr, SMSC_EXTENT);
+        kfree(i2c_get_clientdata(client));
+
+        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(normal_isa)) {
+                return -ENODEV;
+        }
+
+        return i2c_add_driver(&smsc47m1_driver);
+}
+
+static void __exit sm_smsc47m1_exit(void)
+{
+        i2c_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);