__  __    __   __  _____      _            _          _____ _          _ _ 
 |  \/  |   \ \ / / |  __ \    (_)          | |        / ____| |        | | |
 | \  / |_ __\ V /  | |__) | __ ___   ____ _| |_ ___  | (___ | |__   ___| | |
 | |\/| | '__|> <   |  ___/ '__| \ \ / / _` | __/ _ \  \___ \| '_ \ / _ \ | |
 | |  | | |_ / . \  | |   | |  | |\ V / (_| | ||  __/  ____) | | | |  __/ | |
 |_|  |_|_(_)_/ \_\ |_|   |_|  |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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<section id="kernel-driver-dme1737">
<h1>Kernel driver dme1737<a class="headerlink" href="#kernel-driver-dme1737" title="Link to this heading">¶</a></h1>
<p>Supported chips:</p>
<blockquote>
<div><ul>
<li><p>SMSC DME1737 and compatibles (like Asus A8000)</p>
<p>Prefix: ‘dme1737’</p>
<p>Addresses scanned: I2C 0x2c, 0x2d, 0x2e</p>
<p>Datasheet: Provided by SMSC upon request and under NDA</p>
</li>
<li><p>SMSC SCH3112, SCH3114, SCH3116</p>
<p>Prefix: ‘sch311x’</p>
<p>Addresses scanned: none, address read from Super-I/O config space</p>
<p>Datasheet: Available on the Internet</p>
</li>
<li><p>SMSC SCH5027</p>
<p>Prefix: ‘sch5027’</p>
<p>Addresses scanned: I2C 0x2c, 0x2d, 0x2e</p>
<p>Datasheet: Provided by SMSC upon request and under NDA</p>
</li>
<li><p>SMSC SCH5127</p>
<p>Prefix: ‘sch5127’</p>
<p>Addresses scanned: none, address read from Super-I/O config space</p>
<p>Datasheet: Provided by SMSC upon request and under NDA</p>
</li>
</ul>
</div></blockquote>
<dl class="simple">
<dt>Authors:</dt><dd><p>Juerg Haefliger &lt;<a class="reference external" href="mailto:juergh&#37;&#52;&#48;gmail&#46;com">juergh<span>&#64;</span>gmail<span>&#46;</span>com</a>&gt;</p>
</dd>
</dl>
<section id="module-parameters">
<h2>Module Parameters<a class="headerlink" href="#module-parameters" title="Link to this heading">¶</a></h2>
<ul class="simple">
<li><dl class="simple">
<dt>force_start: bool</dt><dd><p>Enables the monitoring of voltage, fan and temp inputs
and PWM output control functions. Using this parameter
shouldn’t be required since the BIOS usually takes care
of this.</p>
</dd>
</dl>
</li>
<li><dl class="simple">
<dt>probe_all_addr: bool</dt><dd><p>Include non-standard LPC addresses 0x162e and 0x164e
when probing for ISA devices. This is required for the
following boards:
- VIA EPIA SN18000</p>
</dd>
</dl>
</li>
</ul>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Link to this heading">¶</a></h2>
<p>This driver implements support for the hardware monitoring capabilities of the
SMSC DME1737 and Asus A8000 (which are the same), SMSC SCH5027, SCH311x,
and SCH5127 Super-I/O chips. These chips feature monitoring of 3 temp sensors
temp[1-3] (2 remote diodes and 1 internal), 8 voltages in[0-7] (7 external and
1 internal) and up to 6 fan speeds fan[1-6]. Additionally, the chips implement
up to 5 PWM outputs pwm[1-3,5-6] for controlling fan speeds both manually and
automatically.</p>
<p>For the DME1737, A8000 and SCH5027, fan[1-2] and pwm[1-2] are always present.
Fan[3-6] and pwm[3,5-6] are optional features and their availability depends on
the configuration of the chip. The driver will detect which features are
present during initialization and create the sysfs attributes accordingly.</p>
<p>For the SCH311x and SCH5127, fan[1-3] and pwm[1-3] are always present and
fan[4-6] and pwm[5-6] don’t exist.</p>
<p>The hardware monitoring features of the DME1737, A8000, and SCH5027 are only
accessible via SMBus, while the SCH311x and SCH5127 only provide access via
the ISA bus. The driver will therefore register itself as an I2C client driver
if it detects a DME1737, A8000, or SCH5027 and as a platform driver if it
detects a SCH311x or SCH5127 chip.</p>
</section>
<section id="voltage-monitoring">
<h2>Voltage Monitoring<a class="headerlink" href="#voltage-monitoring" title="Link to this heading">¶</a></h2>
<p>The voltage inputs are sampled with 12-bit resolution and have internal
scaling resistors. The values returned by the driver therefore reflect true
millivolts and don’t need scaling. The voltage inputs are mapped as follows
(the last column indicates the input ranges):</p>
<p>DME1737, A8000:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>in0: +5VTR      (+5V standby)           0V - 6.64V
in1: Vccp       (processor core)        0V - 3V
in2: VCC        (internal +3.3V)        0V - 4.38V
in3: +5V                                0V - 6.64V
in4: +12V                               0V - 16V
in5: VTR        (+3.3V standby)         0V - 4.38V
in6: Vbat       (+3.0V)                 0V - 4.38V
</pre></div>
</div>
<p>SCH311x:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>in0: +2.5V                              0V - 3.32V
in1: Vccp       (processor core)        0V - 2V
in2: VCC        (internal +3.3V)        0V - 4.38V
in3: +5V                                0V - 6.64V
in4: +12V                               0V - 16V
in5: VTR        (+3.3V standby)         0V - 4.38V
in6: Vbat       (+3.0V)                 0V - 4.38V
</pre></div>
</div>
<p>SCH5027:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>in0: +5VTR      (+5V standby)           0V - 6.64V
in1: Vccp       (processor core)        0V - 3V
in2: VCC        (internal +3.3V)        0V - 4.38V
in3: V2_IN                              0V - 1.5V
in4: V1_IN                              0V - 1.5V
in5: VTR        (+3.3V standby)         0V - 4.38V
in6: Vbat       (+3.0V)                 0V - 4.38V
</pre></div>
</div>
<p>SCH5127:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>in0: +2.5                               0V - 3.32V
in1: Vccp       (processor core)        0V - 3V
in2: VCC        (internal +3.3V)        0V - 4.38V
in3: V2_IN                              0V - 1.5V
in4: V1_IN                              0V - 1.5V
in5: VTR        (+3.3V standby)         0V - 4.38V
in6: Vbat       (+3.0V)                 0V - 4.38V
in7: Vtrip      (+1.5V)                 0V - 1.99V
</pre></div>
</div>
<p>Each voltage input has associated min and max limits which trigger an alarm
when crossed.</p>
</section>
<section id="temperature-monitoring">
<h2>Temperature Monitoring<a class="headerlink" href="#temperature-monitoring" title="Link to this heading">¶</a></h2>
<p>Temperatures are measured with 12-bit resolution and reported in millidegree
Celsius. The chip also features offsets for all 3 temperature inputs which -
when programmed - get added to the input readings. The chip does all the
scaling by itself and the driver therefore reports true temperatures that don’t
need any user-space adjustments. The temperature inputs are mapped as follows
(the last column indicates the input ranges):</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>temp1: Remote diode 1 (3904 type) temperature   -127C - +127C
temp2: DME1737 internal temperature             -127C - +127C
temp3: Remote diode 2 (3904 type) temperature   -127C - +127C
</pre></div>
</div>
<p>Each temperature input has associated min and max limits which trigger an alarm
when crossed. Additionally, each temperature input has a fault attribute that
returns 1 when a faulty diode or an unconnected input is detected and 0
otherwise.</p>
</section>
<section id="fan-monitoring">
<h2>Fan Monitoring<a class="headerlink" href="#fan-monitoring" title="Link to this heading">¶</a></h2>
<p>Fan RPMs are measured with 16-bit resolution. The chip provides inputs for 6
fan tachometers. All 6 inputs have an associated min limit which triggers an
alarm when crossed. Fan inputs 1-4 provide type attributes that need to be set
to the number of pulses per fan revolution that the connected tachometer
generates. Supported values are 1, 2, and 4. Fan inputs 5-6 only support fans
that generate 2 pulses per revolution. Fan inputs 5-6 also provide a max
attribute that needs to be set to the maximum attainable RPM (fan at 100% duty-
cycle) of the input. The chip adjusts the sampling rate based on this value.</p>
</section>
<section id="pwm-output-control">
<h2>PWM Output Control<a class="headerlink" href="#pwm-output-control" title="Link to this heading">¶</a></h2>
<p>This chip features 5 PWM outputs. PWM outputs 1-3 are associated with fan
inputs 1-3 and PWM outputs 5-6 are associated with fan inputs 5-6. PWM outputs
1-3 can be configured to operate either in manual or automatic mode by setting
the appropriate enable attribute accordingly. PWM outputs 5-6 can only operate
in manual mode, their enable attributes are therefore read-only. When set to
manual mode, the fan speed is set by writing the duty-cycle value to the
appropriate PWM attribute. In automatic mode, the PWM attribute returns the
current duty-cycle as set by the fan controller in the chip. All PWM outputs
support the setting of the output frequency via the freq attribute.</p>
<p>In automatic mode, the chip supports the setting of the PWM ramp rate which
defines how fast the PWM output is adjusting to changes of the associated
temperature input. Associating PWM outputs to temperature inputs is done via
temperature zones. The chip features 3 zones whose assignments to temperature
inputs is static and determined during initialization. These assignments can
be retrieved via the zone[1-3]_auto_channels_temp attributes. Each PWM output
is assigned to one (or hottest of multiple) temperature zone(s) through the
pwm[1-3]_auto_channels_zone attributes. Each PWM output has 3 distinct output
duty-cycles: full, low, and min. Full is internally hard-wired to 255 (100%)
and low and min can be programmed via pwm[1-3]_auto_point1_pwm and
pwm[1-3]_auto_pwm_min, respectively. The thermal thresholds of the zones are
programmed via zone[1-3]_auto_point[1-3]_temp and
zone[1-3]_auto_point1_temp_hyst:</p>
<blockquote>
<div><table class="docutils align-default">
<tbody>
<tr class="row-odd"><td><p>pwm[1-3]_auto_point2_pwm</p></td>
<td><p>full-speed duty-cycle (255, i.e., 100%)</p></td>
</tr>
<tr class="row-even"><td><p>pwm[1-3]_auto_point1_pwm</p></td>
<td><p>low-speed duty-cycle</p></td>
</tr>
<tr class="row-odd"><td><p>pwm[1-3]_auto_pwm_min</p></td>
<td><p>min-speed duty-cycle</p></td>
</tr>
<tr class="row-even"><td><p>zone[1-3]_auto_point3_temp</p></td>
<td><p>full-speed temp (all outputs)</p></td>
</tr>
<tr class="row-odd"><td><p>zone[1-3]_auto_point2_temp</p></td>
<td><p>full-speed temp</p></td>
</tr>
<tr class="row-even"><td><p>zone[1-3]_auto_point1_temp</p></td>
<td><p>low-speed temp</p></td>
</tr>
<tr class="row-odd"><td><p>zone[1-3]_auto_point1_temp_hyst</p></td>
<td><p>min-speed temp</p></td>
</tr>
</tbody>
</table>
</div></blockquote>
<p>The chip adjusts the output duty-cycle linearly in the range of auto_point1_pwm
to auto_point2_pwm if the temperature of the associated zone is between
auto_point1_temp and auto_point2_temp. If the temperature drops below the
auto_point1_temp_hyst value, the output duty-cycle is set to the auto_pwm_min
value which only supports two values: 0 or auto_point1_pwm. That means that the
fan either turns completely off or keeps spinning with the low-speed
duty-cycle. If any of the temperatures rise above the auto_point3_temp value,
all PWM outputs are set to 100% duty-cycle.</p>
<p>Following is another representation of how the chip sets the output duty-cycle
based on the temperature of the associated thermal zone:</p>
<blockquote>
<div><table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Temperature</p></th>
<th class="head"><p>Duty-Cycle
Rising Temp</p></th>
<th class="head"><p>Duty-Cycle
Falling Temp</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>full-speed</p></td>
<td><p>full-speed</p></td>
<td><p>full-speed</p></td>
</tr>
<tr class="row-odd"><td><ul class="simple">
<li></li>
</ul>
</td>
<td><p>&lt; linearly
adjusted
duty-cycle &gt;</p></td>
<td><ul class="simple">
<li></li>
</ul>
</td>
</tr>
<tr class="row-even"><td><p>low-speed</p></td>
<td><p>low-speed</p></td>
<td><p>low-speed</p></td>
</tr>
<tr class="row-odd"><td><ul class="simple">
<li></li>
</ul>
</td>
<td><p>min-speed</p></td>
<td><p>low-speed</p></td>
</tr>
<tr class="row-even"><td><p>min-speed</p></td>
<td><p>min-speed</p></td>
<td><p>min-speed</p></td>
</tr>
<tr class="row-odd"><td><ul class="simple">
<li></li>
</ul>
</td>
<td><p>min-speed</p></td>
<td><p>min-speed</p></td>
</tr>
</tbody>
</table>
</div></blockquote>
</section>
<section id="sysfs-attributes">
<h2>Sysfs Attributes<a class="headerlink" href="#sysfs-attributes" title="Link to this heading">¶</a></h2>
<p>Following is a list of all sysfs attributes that the driver provides, their
permissions and a short description:</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Name</p></th>
<th class="head"><p>Perm</p></th>
<th class="head"><p>Description</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>cpu0_vid</p></td>
<td><p>RO</p></td>
<td><p>CPU core reference voltage in
millivolts.</p></td>
</tr>
<tr class="row-odd"><td><p>vrm</p></td>
<td><p>RW</p></td>
<td><p>Voltage regulator module version
number.</p></td>
</tr>
<tr class="row-even"><td><p>in[0-7]_input</p></td>
<td><p>RO</p></td>
<td><p>Measured voltage in millivolts.</p></td>
</tr>
<tr class="row-odd"><td><p>in[0-7]_min</p></td>
<td><p>RW</p></td>
<td><p>Low limit for voltage input.</p></td>
</tr>
<tr class="row-even"><td><p>in[0-7]_max</p></td>
<td><p>RW</p></td>
<td><p>High limit for voltage input.</p></td>
</tr>
<tr class="row-odd"><td><p>in[0-7]_alarm</p></td>
<td><p>RO</p></td>
<td><p>Voltage input alarm. Returns 1 if
voltage input is or went outside the
associated min-max range, 0 otherwise.</p></td>
</tr>
<tr class="row-even"><td><p>temp[1-3]_input</p></td>
<td><p>RO</p></td>
<td><p>Measured temperature in millidegree
Celsius.</p></td>
</tr>
<tr class="row-odd"><td><p>temp[1-3]_min</p></td>
<td><p>RW</p></td>
<td><p>Low limit for temp input.</p></td>
</tr>
<tr class="row-even"><td><p>temp[1-3]_max</p></td>
<td><p>RW</p></td>
<td><p>High limit for temp input.</p></td>
</tr>
<tr class="row-odd"><td><p>temp[1-3]_offset</p></td>
<td><p>RW</p></td>
<td><p>Offset for temp input. This value will
be added by the chip to the measured
temperature.</p></td>
</tr>
<tr class="row-even"><td><p>temp[1-3]_alarm</p></td>
<td><p>RO</p></td>
<td><p>Alarm for temp input. Returns 1 if temp
input is or went outside the associated
min-max range, 0 otherwise.</p></td>
</tr>
<tr class="row-odd"><td><p>temp[1-3]_fault</p></td>
<td><p>RO</p></td>
<td><p>Temp input fault. Returns 1 if the chip
detects a faulty thermal diode or an
unconnected temp input, 0 otherwise.</p></td>
</tr>
<tr class="row-even"><td><p>zone[1-3]_auto_channels_temp</p></td>
<td><p>RO</p></td>
<td><p>Temperature zone to temperature input
mapping. This attribute is a bitfield
and supports the following values:</p>
<blockquote>
<div><ul class="simple">
<li><p>1: temp1</p></li>
<li><p>2: temp2</p></li>
<li><p>4: temp3</p></li>
</ul>
</div></blockquote>
</td>
</tr>
<tr class="row-odd"><td><p>zone[1-3]_auto_point1_temp_hyst</p></td>
<td><p>RW</p></td>
<td><p>Auto PWM temp point1 hysteresis. The
output of the corresponding PWM is set
to the pwm_auto_min value if the temp
falls below the auto_point1_temp_hyst
value.</p></td>
</tr>
<tr class="row-even"><td><p>zone[1-3]_auto_point[1-3]_temp</p></td>
<td><p>RW</p></td>
<td><p>Auto PWM temp points. Auto_point1 is
the low-speed temp, auto_point2 is the
full-speed temp, and auto_point3 is the
temp at which all PWM outputs are set
to full-speed (100% duty-cycle).</p></td>
</tr>
<tr class="row-odd"><td><p>fan[1-6]_input</p></td>
<td><p>RO</p></td>
<td><p>Measured fan speed in RPM.</p></td>
</tr>
<tr class="row-even"><td><p>fan[1-6]_min</p></td>
<td><p>RW</p></td>
<td><p>Low limit for fan input.</p></td>
</tr>
<tr class="row-odd"><td><p>fan[1-6]_alarm</p></td>
<td><p>RO</p></td>
<td><p>Alarm for fan input. Returns 1 if fan
input is or went below the associated
min value, 0 otherwise.</p></td>
</tr>
<tr class="row-even"><td><p>fan[1-4]_type</p></td>
<td><p>RW</p></td>
<td><p>Type of attached fan. Expressed in
number of pulses per revolution that
the fan generates. Supported values are
1, 2, and 4.</p></td>
</tr>
<tr class="row-odd"><td><p>fan[5-6]_max</p></td>
<td><p>RW</p></td>
<td><p>Max attainable RPM at 100% duty-cycle.
Required for chip to adjust the
sampling rate accordingly.</p></td>
</tr>
<tr class="row-even"><td><p>pmw[1-3,5-6]</p></td>
<td><p>RO/RW</p></td>
<td><p>Duty-cycle of PWM output. Supported
values are 0-255 (0%-100%). Only
writeable if the associated PWM is in
manual mode.</p></td>
</tr>
<tr class="row-odd"><td><p>pwm[1-3]_enable</p></td>
<td><p>RW</p></td>
<td><p>Enable of PWM outputs 1-3. Supported
values are:</p>
<blockquote>
<div><ul class="simple">
<li><p>0: turned off (output &#64; 100%)</p></li>
<li><p>1: manual mode</p></li>
<li><p>2: automatic mode</p></li>
</ul>
</div></blockquote>
</td>
</tr>
<tr class="row-even"><td><p>pwm[5-6]_enable</p></td>
<td><p>RO</p></td>
<td><p>Enable of PWM outputs 5-6. Always
returns 1 since these 2 outputs are
hard-wired to manual mode.</p></td>
</tr>
<tr class="row-odd"><td><p>pmw[1-3,5-6]_freq</p></td>
<td><p>RW</p></td>
<td><p>Frequency of PWM output. Supported
values are in the range 11Hz-30000Hz
(default is 25000Hz).</p></td>
</tr>
<tr class="row-even"><td><p>pmw[1-3]_ramp_rate</p></td>
<td><p>RW</p></td>
<td><p>Ramp rate of PWM output. Determines how
fast the PWM duty-cycle will change
when the PWM is in automatic mode.
Expressed in ms per PWM step. Supported
values are in the range 0ms-206ms
(default is 0, which means the duty-
cycle changes instantly).</p></td>
</tr>
<tr class="row-odd"><td><p>pwm[1-3]_auto_channels_zone</p></td>
<td><p>RW</p></td>
<td><p>PWM output to temperature zone mapping.
This attribute is a bitfield and
supports the following values:</p>
<blockquote>
<div><ul class="simple">
<li><p>1: zone1</p></li>
<li><p>2: zone2</p></li>
<li><p>4: zone3</p></li>
<li><p>6: highest of zone[2-3]</p></li>
<li><p>7: highest of zone[1-3]</p></li>
</ul>
</div></blockquote>
</td>
</tr>
<tr class="row-even"><td><p>pwm[1-3]_auto_pwm_min</p></td>
<td><p>RW</p></td>
<td><p>Auto PWM min pwm. Minimum PWM duty-
cycle. Supported values are 0 or
auto_point1_pwm.</p></td>
</tr>
<tr class="row-odd"><td><p>pwm[1-3]_auto_point1_pwm</p></td>
<td><p>RW</p></td>
<td><p>Auto PWM pwm point. Auto_point1 is the
low-speed duty-cycle.</p></td>
</tr>
<tr class="row-even"><td><p>pwm[1-3]_auto_point2_pwm</p></td>
<td><p>RO</p></td>
<td><p>Auto PWM pwm point. Auto_point2 is the
full-speed duty-cycle which is hard-
wired to 255 (100% duty-cycle).</p></td>
</tr>
</tbody>
</table>
</section>
<section id="chip-differences">
<h2>Chip Differences<a class="headerlink" href="#chip-differences" title="Link to this heading">¶</a></h2>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Feature</p></th>
<th class="head"><p>dme1737</p></th>
<th class="head"><p>sch311x</p></th>
<th class="head"><p>sch5027</p></th>
<th class="head"><p>sch5127</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>temp[1-3]_offset</p></td>
<td><p>yes</p></td>
<td><p>yes</p></td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td><p>vid</p></td>
<td><p>yes</p></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td><p>zone3</p></td>
<td><p>yes</p></td>
<td><p>yes</p></td>
<td><p>yes</p></td>
<td></td>
</tr>
<tr class="row-odd"><td><p>zone[1-3]_hyst</p></td>
<td><p>yes</p></td>
<td><p>yes</p></td>
<td></td>
<td></td>
</tr>
<tr class="row-even"><td><p>pwm min/off</p></td>
<td><p>yes</p></td>
<td><p>yes</p></td>
<td></td>
<td></td>
</tr>
<tr class="row-odd"><td><p>fan3</p></td>
<td><p>opt</p></td>
<td><p>yes</p></td>
<td><p>opt</p></td>
<td><p>yes</p></td>
</tr>
<tr class="row-even"><td><p>pwm3</p></td>
<td><p>opt</p></td>
<td><p>yes</p></td>
<td><p>opt</p></td>
<td><p>yes</p></td>
</tr>
<tr class="row-odd"><td><p>fan4</p></td>
<td><p>opt</p></td>
<td></td>
<td><p>opt</p></td>
<td></td>
</tr>
<tr class="row-even"><td><p>fan5</p></td>
<td><p>opt</p></td>
<td></td>
<td><p>opt</p></td>
<td></td>
</tr>
<tr class="row-odd"><td><p>pwm5</p></td>
<td><p>opt</p></td>
<td></td>
<td><p>opt</p></td>
<td></td>
</tr>
<tr class="row-even"><td><p>fan6</p></td>
<td><p>opt</p></td>
<td></td>
<td><p>opt</p></td>
<td></td>
</tr>
<tr class="row-odd"><td><p>pwm6</p></td>
<td><p>opt</p></td>
<td></td>
<td><p>opt</p></td>
<td></td>
</tr>
<tr class="row-even"><td><p>in7</p></td>
<td></td>
<td></td>
<td></td>
<td><p>yes</p></td>
</tr>
</tbody>
</table>
</section>
</section>


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