hwmon: w83627ehf updates

Add control of fan minimum turn-on output levels, decoupling it from the
fan turn-off output level.  Add control of rate of change of fan output
level.  These in turn allow lower turn-off rotor speed and smoother
transitions for better thermal and acoustic control authority.  Add
support for constant fan speed and proportional-response operations modes.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Daniel J Blueman <daniel.blueman@gmail.com>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: David Hubbard <david.c.hubbard@gmail.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 53 insertions, 19 deletions

diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index bb5e78748783..0dcaba9b7189 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -5,6 +5,7 @@
     Copyright (C) 2006  Yuan Mu (Winbond),
                         Rudolf Marek <r.marek@assembler.cz>
                         David Hubbard <david.c.hubbard@gmail.com>
+                        Daniel J Blueman <daniel.blueman@gmail.com>
 
     Shamelessly ripped from the w83627hf driver
     Copyright (C) 2003  Mark Studebaker
@@ -177,12 +178,15 @@ static const u16 W83627EHF_REG_TEMP_CONFIG[] = { 0x152, 0x252 };
 #define W83627EHF_REG_ALARM3            0x45B
 
 /* SmartFan registers */
+#define W83627EHF_REG_FAN_STEPUP_TIME 0x0f
+#define W83627EHF_REG_FAN_STEPDOWN_TIME 0x0e
+
 /* DC or PWM output fan configuration */
 static const u8 W83627EHF_REG_PWM_ENABLE[] = {
         0x04,                   /* SYS FAN0 output mode and PWM mode */
         0x04,                   /* CPU FAN0 output mode and PWM mode */
         0x12,                   /* AUX FAN mode */
-        0x62,                   /* CPU fan1 mode */
+        0x62,                   /* CPU FAN1 mode */
 };
 
 static const u8 W83627EHF_PWM_MODE_SHIFT[] = { 0, 1, 0, 6 };
@@ -193,10 +197,12 @@ static const u8 W83627EHF_REG_PWM[] = { 0x01, 0x03, 0x11, 0x61 };
 static const u8 W83627EHF_REG_TARGET[] = { 0x05, 0x06, 0x13, 0x63 };
 static const u8 W83627EHF_REG_TOLERANCE[] = { 0x07, 0x07, 0x14, 0x62 };
 
-
 /* Advanced Fan control, some values are common for all fans */
-static const u8 W83627EHF_REG_FAN_MIN_OUTPUT[] = { 0x08, 0x09, 0x15, 0x64 };
-static const u8 W83627EHF_REG_FAN_STOP_TIME[] = { 0x0C, 0x0D, 0x17, 0x66 };
+static const u8 W83627EHF_REG_FAN_START_OUTPUT[] = { 0x0a, 0x0b, 0x16, 0x65 };
+static const u8 W83627EHF_REG_FAN_STOP_OUTPUT[] = { 0x08, 0x09, 0x15, 0x64 };
+static const u8 W83627EHF_REG_FAN_STOP_TIME[] = { 0x0c, 0x0d, 0x17, 0x66 };
+static const u8 W83627EHF_REG_FAN_MAX_OUTPUT[] = { 0xff, 0x67, 0xff, 0x69 };
+static const u8 W83627EHF_REG_FAN_STEP_OUTPUT[] = { 0xff, 0x68, 0xff, 0x6a };
 
 /*
  * Conversions
@@ -295,14 +301,19 @@ struct w83627ehf_data {
 
         u8 pwm_mode[4]; /* 0->DC variable voltage, 1->PWM variable duty cycle */
         u8 pwm_enable[4]; /* 1->manual
-                             2->thermal cruise (also called SmartFan I) */
+                             2->thermal cruise mode (also called SmartFan I)
+                             3->fan speed cruise mode
+                             4->variable thermal cruise (also called SmartFan III) */
         u8 pwm_num;             /* number of pwm */
         u8 pwm[4];
         u8 target_temp[4];
         u8 tolerance[4];
 
-        u8 fan_min_output[4]; /* minimum fan speed */
-        u8 fan_stop_time[4];
+        u8 fan_start_output[4]; /* minimum fan speed when spinning up */
+        u8 fan_stop_output[4]; /* minimum fan speed when spinning down */
+        u8 fan_stop_time[4]; /* time at minimum before disabling fan */
+        u8 fan_max_output[4]; /* maximum fan speed */
+        u8 fan_step_output[4]; /* rate of change output value */
 
         u8 vid;
         u8 vrm;
@@ -529,8 +540,10 @@ static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
                                                 & 3) + 1;
                         data->pwm[i] = w83627ehf_read_value(data,
                                                 W83627EHF_REG_PWM[i]);
-                        data->fan_min_output[i] = w83627ehf_read_value(data,
-                                                W83627EHF_REG_FAN_MIN_OUTPUT[i]);
+                        data->fan_start_output[i] = w83627ehf_read_value(data,
+                                                W83627EHF_REG_FAN_START_OUTPUT[i]);
+                        data->fan_stop_output[i] = w83627ehf_read_value(data,
+                                                W83627EHF_REG_FAN_STOP_OUTPUT[i]);
                         data->fan_stop_time[i] = w83627ehf_read_value(data,
                                                 W83627EHF_REG_FAN_STOP_TIME[i]);
                         data->target_temp[i] =
@@ -976,7 +989,7 @@ store_pwm_enable(struct device *dev, struct device_attribute *attr,
         u32 val = simple_strtoul(buf, NULL, 10);
         u16 reg;
 
-        if (!val || (val > 2))  /* only modes 1 and 2 are supported */
+        if (!val || (val > 4))
                 return -EINVAL;
         mutex_lock(&data->update_lock);
         reg = w83627ehf_read_value(data, W83627EHF_REG_PWM_ENABLE[nr]);
@@ -1118,7 +1131,10 @@ store_##reg(struct device *dev, struct device_attribute *attr, \
         return count; \
 }
 
-fan_functions(fan_min_output, FAN_MIN_OUTPUT)
+fan_functions(fan_start_output, FAN_START_OUTPUT)
+fan_functions(fan_stop_output, FAN_STOP_OUTPUT)
+fan_functions(fan_max_output, FAN_MAX_OUTPUT)
+fan_functions(fan_step_output, FAN_STEP_OUTPUT)
 
 #define fan_time_functions(reg, REG) \
 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
@@ -1161,8 +1177,14 @@ static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 static struct sensor_device_attribute sda_sf3_arrays_fan4[] = {
         SENSOR_ATTR(pwm4_stop_time, S_IWUSR | S_IRUGO, show_fan_stop_time,
                     store_fan_stop_time, 3),
-        SENSOR_ATTR(pwm4_min_output, S_IWUSR | S_IRUGO, show_fan_min_output,
-                    store_fan_min_output, 3),
+        SENSOR_ATTR(pwm4_start_output, S_IWUSR | S_IRUGO, show_fan_start_output,
+                    store_fan_start_output, 3),
+        SENSOR_ATTR(pwm4_stop_output, S_IWUSR | S_IRUGO, show_fan_stop_output,
+                    store_fan_stop_output, 3),
+        SENSOR_ATTR(pwm4_max_output, S_IWUSR | S_IRUGO, show_fan_max_output,
+                    store_fan_max_output, 3),
+        SENSOR_ATTR(pwm4_step_output, S_IWUSR | S_IRUGO, show_fan_step_output,
+                    store_fan_step_output, 3),
 };
 
 static struct sensor_device_attribute sda_sf3_arrays[] = {
@@ -1172,12 +1194,24 @@ static struct sensor_device_attribute sda_sf3_arrays[] = {
                     store_fan_stop_time, 1),
         SENSOR_ATTR(pwm3_stop_time, S_IWUSR | S_IRUGO, show_fan_stop_time,
                     store_fan_stop_time, 2),
-        SENSOR_ATTR(pwm1_min_output, S_IWUSR | S_IRUGO, show_fan_min_output,
-                    store_fan_min_output, 0),
-        SENSOR_ATTR(pwm2_min_output, S_IWUSR | S_IRUGO, show_fan_min_output,
-                    store_fan_min_output, 1),
-        SENSOR_ATTR(pwm3_min_output, S_IWUSR | S_IRUGO, show_fan_min_output,
-                    store_fan_min_output, 2),
+        SENSOR_ATTR(pwm1_start_output, S_IWUSR | S_IRUGO, show_fan_start_output,
+                    store_fan_start_output, 0),
+        SENSOR_ATTR(pwm2_start_output, S_IWUSR | S_IRUGO, show_fan_start_output,
+                    store_fan_start_output, 1),
+        SENSOR_ATTR(pwm3_start_output, S_IWUSR | S_IRUGO, show_fan_start_output,
+                    store_fan_start_output, 2),
+        SENSOR_ATTR(pwm1_stop_output, S_IWUSR | S_IRUGO, show_fan_stop_output,
+                    store_fan_stop_output, 0),
+        SENSOR_ATTR(pwm2_stop_output, S_IWUSR | S_IRUGO, show_fan_stop_output,
+                    store_fan_stop_output, 1),
+        SENSOR_ATTR(pwm3_stop_output, S_IWUSR | S_IRUGO, show_fan_stop_output,
+                    store_fan_stop_output, 2),
+
+        /* pwm1 and pwm3 don't support max and step settings */
+        SENSOR_ATTR(pwm2_max_output, S_IWUSR | S_IRUGO, show_fan_max_output,
+                    store_fan_max_output, 1),
+        SENSOR_ATTR(pwm2_step_output, S_IWUSR | S_IRUGO, show_fan_step_output,
+                    store_fan_step_output, 1),
 };
 
 static ssize_t