hwmon/smsc47m1: Add support for the LPC47M292

The new SMSC LPC47M292 Super-I/O chip is a bit different from the
previous ones, it supports a 3rd fan, but unfortunately the pin
configuration registers are different.

Signed-off-by: Jean Delvare <khali@linux-fr.org>

3 files changed, 139 insertions, 41 deletions

diff --git a/Documentation/hwmon/smsc47m1 b/Documentation/hwmon/smsc47m1
index 04a11124f667..42c8431b3c9d 100644
--- a/Documentation/hwmon/smsc47m1
+++ b/Documentation/hwmon/smsc47m1
@@ -14,6 +14,10 @@ Supported chips:
         http://www.smsc.com/main/datasheets/47m14x.pdf
         http://www.smsc.com/main/tools/discontinued/47m15x.pdf
         http://www.smsc.com/main/datasheets/47m192.pdf
+  * SMSC LPC47M292
+    Addresses scanned: none, address read from Super I/O config space
+    Prefix: 'smsc47m2'
+    Datasheet: Not public
   * SMSC LPC47M997
     Addresses scanned: none, address read from Super I/O config space
     Prefix: 'smsc47m1'
@@ -32,9 +36,10 @@ Description
 The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
 contain monitoring and PWM control circuitry for two fans.
 
-The 47M15x and 47M192 chips contain a full 'hardware monitoring block'
-in addition to the fan monitoring and control. The hardware monitoring
-block is not supported by the driver.
+The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware
+monitoring block' in addition to the fan monitoring and control. The
+hardware monitoring block is not supported by this driver, use the
+smsc47m192 driver for that.
 
 No documentation is available for the 47M997, but it has the same device
 ID as the 47M15x and 47M192 chips and seems to be compatible.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 68ee9702e339..399b6a92e9b0 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -422,11 +422,12 @@ config SENSORS_SMSC47M1
           If you say yes here you get support for the integrated fan
           monitoring and control capabilities of the SMSC LPC47B27x,
           LPC47M10x, LPC47M112, LPC47M13x, LPC47M14x, LPC47M15x,
-          LPC47M192 and LPC47M997 chips.
+          LPC47M192, LPC47M292 and LPC47M997 chips.
 
-          The temperature and voltage sensor features of the LPC47M192
-          and LPC47M997 are supported by another driver, select also
-          "SMSC LPC47M192 and compatibles" below for those.
+          The temperature and voltage sensor features of the LPC47M15x,
+          LPC47M192, LPC47M292 and LPC47M997 are supported by another
+          driver, select also "SMSC LPC47M192 and compatibles" below for
+          those.
 
           This driver can also be built as a module.  If so, the module
           will be called smsc47m1.
diff --git a/drivers/hwmon/smsc47m1.c b/drivers/hwmon/smsc47m1.c
index beb881c4b2e8..16762cca87e5 100644
--- a/drivers/hwmon/smsc47m1.c
+++ b/drivers/hwmon/smsc47m1.c
@@ -3,10 +3,11 @@
                  for hardware monitoring
 
     Supports the SMSC LPC47B27x, LPC47M10x, LPC47M112, LPC47M13x,
-    LPC47M14x, LPC47M15x, LPC47M192 and LPC47M997 Super-I/O chips.
+    LPC47M14x, LPC47M15x, LPC47M192, LPC47M292 and LPC47M997
+    Super-I/O chips.
 
     Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
-    Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
+    Copyright (C) 2004-2007 Jean Delvare <khali@linux-fr.org>
     Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
                         and Jean Delvare
 
@@ -40,6 +41,8 @@
 
 /* Address is autodetected, there is no default value */
 static unsigned short address;
+static u8 devid;
+enum chips { smsc47m1, smsc47m2 };
 
 /* Super-I/0 registers and commands */
 
@@ -87,10 +90,18 @@ superio_exit(void)
 #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))
+
+static const u8 SMSC47M1_REG_FAN[3]             = { 0x59, 0x5a, 0x6b };
+static const u8 SMSC47M1_REG_FAN_PRELOAD[3]     = { 0x5b, 0x5c, 0x6c };
+static const u8 SMSC47M1_REG_PWM[3]             = { 0x56, 0x57, 0x69 };
+
+#define SMSC47M2_REG_ALARM6             0x09
+#define SMSC47M2_REG_TPIN1              0x38
+#define SMSC47M2_REG_TPIN2              0x37
+#define SMSC47M2_REG_TPIN3              0x2d
+#define SMSC47M2_REG_PPIN3              0x2c
+#define SMSC47M2_REG_FANDIV3            0x6a
 
 #define MIN_FROM_REG(reg,div)           ((reg)>=192 ? 0 : \
                                          983040/((192-(reg))*(div)))
@@ -103,17 +114,18 @@ superio_exit(void)
 
 struct smsc47m1_data {
         struct i2c_client client;
+        enum chips type;
         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 fan[3];              /* Register value */
+        u8 fan_preload[3];      /* Register value */
+        u8 fan_div[3];          /* Register encoding, shifted right */
         u8 alarms;              /* Register encoding */
-        u8 pwm[2];              /* Register value (bit 7 is enable) */
+        u8 pwm[3];              /* Register value (bit 0 is disable) */
 };
 
 
@@ -200,7 +212,7 @@ static ssize_t set_fan_min(struct device *dev, const char *buf,
         }
 
         data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
-        smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD(nr),
+        smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD[nr],
                              data->fan_preload[nr]);
         mutex_unlock(&data->update_lock);
 
@@ -234,15 +246,26 @@ static ssize_t set_fan_div(struct device *dev, const char *buf,
                 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);
+        switch (nr) {
+        case 0:
+        case 1:
+                tmp = smsc47m1_read_value(client, SMSC47M1_REG_FANDIV)
+                      & ~(0x03 << (4 + 2 * nr));
+                tmp |= data->fan_div[nr] << (4 + 2 * nr);
+                smsc47m1_write_value(client, SMSC47M1_REG_FANDIV, tmp);
+                break;
+        case 2:
+                tmp = smsc47m1_read_value(client, SMSC47M2_REG_FANDIV3) & 0xCF;
+                tmp |= data->fan_div[2] << 4;
+                smsc47m1_write_value(client, SMSC47M2_REG_FANDIV3, tmp);
+                break;
+        }
 
         /* 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),
+        smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD[nr],
                              data->fan_preload[nr]);
         mutex_unlock(&data->update_lock);
 
@@ -263,7 +286,7 @@ static ssize_t set_pwm(struct device *dev, const char *buf,
         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),
+        smsc47m1_write_value(client, SMSC47M1_REG_PWM[nr],
                              data->pwm[nr]);
         mutex_unlock(&data->update_lock);
 
@@ -284,7 +307,7 @@ static ssize_t set_pwm_en(struct device *dev, const char *buf,
         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),
+        smsc47m1_write_value(client, SMSC47M1_REG_PWM[nr],
                              data->pwm[nr]);
         mutex_unlock(&data->update_lock);
 
@@ -345,6 +368,7 @@ static DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,		\
 
 fan_present(1);
 fan_present(2);
+fan_present(3);
 
 static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);
 
@@ -358,11 +382,16 @@ static struct attribute *smsc47m1_attributes[] = {
         &dev_attr_fan2_input.attr,
         &dev_attr_fan2_min.attr,
         &dev_attr_fan2_div.attr,
+        &dev_attr_fan3_input.attr,
+        &dev_attr_fan3_min.attr,
+        &dev_attr_fan3_div.attr,
 
         &dev_attr_pwm1.attr,
         &dev_attr_pwm1_enable.attr,
         &dev_attr_pwm2.attr,
         &dev_attr_pwm2_enable.attr,
+        &dev_attr_pwm3.attr,
+        &dev_attr_pwm3_enable.attr,
 
         &dev_attr_alarms.attr,
         NULL
@@ -377,7 +406,7 @@ static int __init smsc47m1_find(unsigned short *addr)
         u8 val;
 
         superio_enter();
-        val = superio_inb(SUPERIO_REG_DEVID);
+        devid = superio_inb(SUPERIO_REG_DEVID);
 
         /*
          * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x
@@ -386,18 +415,29 @@ static int __init smsc47m1_find(unsigned short *addr)
          * 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.
+         * The LPC47M292 (device id 0x6B) is somewhat compatible, but it
+         * supports a 3rd fan, and the pin configuration registers are
+         * unfortunately different.
          */
-        if (val == 0x51)
+        switch (devid) {
+        case 0x51:
                 printk(KERN_INFO "smsc47m1: Found SMSC LPC47B27x\n");
-        else if (val == 0x59)
+                break;
+        case 0x59:
                 printk(KERN_INFO "smsc47m1: Found SMSC "
                        "LPC47M10x/LPC47M112/LPC47M13x\n");
-        else if (val == 0x5F)
+                break;
+        case 0x5F:
                 printk(KERN_INFO "smsc47m1: Found SMSC LPC47M14x\n");
-        else if (val == 0x60)
+                break;
+        case 0x60:
                 printk(KERN_INFO "smsc47m1: Found SMSC "
                        "LPC47M15x/LPC47M192/LPC47M997\n");
-        else {
+                break;
+        case 0x6B:
+                printk(KERN_INFO "smsc47m1: Found SMSC LPC47M292\n");
+                break;
+        default:
                 superio_exit();
                 return -ENODEV;
         }
@@ -421,7 +461,7 @@ 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;
+        int fan1, fan2, fan3, pwm1, pwm2, pwm3;
 
         if (!request_region(address, SMSC_EXTENT, smsc47m1_driver.driver.name)) {
                 dev_err(&adapter->dev, "Region 0x%x already in use!\n", address);
@@ -433,6 +473,7 @@ static int smsc47m1_detect(struct i2c_adapter *adapter)
                 goto error_release;
         }
 
+        data->type = devid == 0x6B ? smsc47m2 : smsc47m1;
         new_client = &data->client;
         i2c_set_clientdata(new_client, data);
         new_client->addr = address;
@@ -441,20 +482,35 @@ static int smsc47m1_detect(struct i2c_adapter *adapter)
         new_client->driver = &smsc47m1_driver;
         new_client->flags = 0;
 
-        strlcpy(new_client->name, "smsc47m1", I2C_NAME_SIZE);
+        strlcpy(new_client->name,
+                data->type == smsc47m2 ? "smsc47m2" : "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)) {
+        if (data->type == smsc47m2) {
+                fan1 = (smsc47m1_read_value(new_client, SMSC47M2_REG_TPIN1)
+                        & 0x0d) == 0x09;
+                fan2 = (smsc47m1_read_value(new_client, SMSC47M2_REG_TPIN2)
+                        & 0x0d) == 0x09;
+                fan3 = (smsc47m1_read_value(new_client, SMSC47M2_REG_TPIN3)
+                        & 0x0d) == 0x0d;
+                pwm3 = (smsc47m1_read_value(new_client, SMSC47M2_REG_PPIN3)
+                        & 0x0d) == 0x08;
+        } else {
+                fan1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(0))
+                        & 0x05) == 0x05;
+                fan2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(1))
+                        & 0x05) == 0x05;
+                fan3 = 0;
+                pwm3 = 0;
+        }
+        if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) {
                 dev_warn(&adapter->dev, "Device at 0x%x is not configured, "
                          "will not use\n", new_client->addr);
                 err = -ENODEV;
@@ -497,6 +553,18 @@ static int smsc47m1_detect(struct i2c_adapter *adapter)
                 dev_dbg(&new_client->dev, "Fan 2 not enabled by hardware, "
                         "skipping\n");
 
+        if (fan3) {
+                if ((err = device_create_file(&new_client->dev,
+                                              &dev_attr_fan3_input))
+                 || (err = device_create_file(&new_client->dev,
+                                              &dev_attr_fan3_min))
+                 || (err = device_create_file(&new_client->dev,
+                                              &dev_attr_fan3_div)))
+                        goto error_remove_files;
+        } else
+                dev_dbg(&new_client->dev, "Fan 3 not enabled by hardware, "
+                        "skipping\n");
+
         if (pwm1) {
                 if ((err = device_create_file(&new_client->dev,
                                               &dev_attr_pwm1))
@@ -506,6 +574,7 @@ static int smsc47m1_detect(struct i2c_adapter *adapter)
         } else
                 dev_dbg(&new_client->dev, "PWM 1 not enabled by hardware, "
                         "skipping\n");
+
         if (pwm2) {
                 if ((err = device_create_file(&new_client->dev,
                                               &dev_attr_pwm2))
@@ -516,6 +585,16 @@ static int smsc47m1_detect(struct i2c_adapter *adapter)
                 dev_dbg(&new_client->dev, "PWM 2 not enabled by hardware, "
                         "skipping\n");
 
+        if (pwm3) {
+                if ((err = device_create_file(&new_client->dev,
+                                              &dev_attr_pwm3))
+                 || (err = device_create_file(&new_client->dev,
+                                              &dev_attr_pwm3_enable)))
+                        goto error_remove_files;
+        } else
+                dev_dbg(&new_client->dev, "PWM 3 not enabled by hardware, "
+                        "skipping\n");
+
         if ((err = device_create_file(&new_client->dev, &dev_attr_alarms)))
                 goto error_remove_files;
 
@@ -580,15 +659,16 @@ static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
         mutex_lock(&data->update_lock);
 
         if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
-                int i;
+                int i, fan_nr;
+                fan_nr = data->type == smsc47m2 ? 3 : 2;
 
-                for (i = 0; i < 2; i++) {
+                for (i = 0; i < fan_nr; i++) {
                         data->fan[i] = smsc47m1_read_value(client,
-                                       SMSC47M1_REG_FAN(i));
+                                       SMSC47M1_REG_FAN[i]);
                         data->fan_preload[i] = smsc47m1_read_value(client,
-                                               SMSC47M1_REG_FAN_PRELOAD(i));
+                                               SMSC47M1_REG_FAN_PRELOAD[i]);
                         data->pwm[i] = smsc47m1_read_value(client,
-                                       SMSC47M1_REG_PWM(i));
+                                       SMSC47M1_REG_PWM[i]);
                 }
 
                 i = smsc47m1_read_value(client, SMSC47M1_REG_FANDIV);
@@ -601,6 +681,18 @@ static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
                 if (data->alarms)
                         smsc47m1_write_value(client, SMSC47M1_REG_ALARM, 0xC0);
 
+                if (fan_nr >= 3) {
+                        data->fan_div[2] = (smsc47m1_read_value(client,
+                                            SMSC47M2_REG_FANDIV3) >> 4) & 0x03;
+                        data->alarms |= (smsc47m1_read_value(client,
+                                         SMSC47M2_REG_ALARM6) & 0x40) >> 4;
+                        /* Clear alarm if needed */
+                        if (data->alarms & 0x04)
+                                smsc47m1_write_value(client,
+                                                     SMSC47M2_REG_ALARM6,
+                                                     0x40);
+                }
+
                 data->last_updated = jiffies;
         }