hwmon: (pmbus/ltc2978) Explicit driver for LTC2978

Provide explicit driver for LTC2978 to enable support for minimum and peak
attributes. Remove ltc2978 chip id from generic pmbus driver.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978
new file mode 100644
index 000000000000..499129e11897
--- /dev/null
+++ b/Documentation/hwmon/ltc2978
@@ -0,0 +1,78 @@
+Kernel driver ltc2978
+=====================
+
+Supported chips:
+  * Linear Technology LTC2978
+    Prefix: 'ltc2978'
+    Addresses scanned: -
+    Datasheet: http://cds.linear.com/docs/Datasheet/2978fa.pdf
+
+Author: Guenter Roeck <guenter.roeck@ericsson.com>
+
+
+Description
+-----------
+
+The LTC2978 is an octal power supply monitor, supervisor, sequencer and
+margin controller.
+
+
+Usage Notes
+-----------
+
+This driver does not probe for PMBus devices. You will have to instantiate
+devices explicitly.
+
+Example: the following commands will load the driver for an LTC2978 at address
+0x60 on I2C bus #1:
+
+# modprobe ltc2978
+# echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device
+
+
+Sysfs attributes
+----------------
+
+in1_label               "vin"
+in1_input               Measured input voltage.
+in1_min                 Minimum input voltage.
+in1_max                 Maximum input voltage.
+in1_lcrit               Critical minimum input voltage.
+in1_crit                Critical maximum input voltage.
+in1_min_alarm           Input voltage low alarm.
+in1_max_alarm           Input voltage high alarm.
+in1_lcrit_alarm         Input voltage critical low alarm.
+in1_crit_alarm          Input voltage critical high alarm.
+in1_lowest              Lowest input voltage.
+in1_highest             Highest input voltage.
+in1_reset_history       Reset history. Writing into this attribute will reset
+                        history for all attributes.
+
+in[2-9]_label           "vout[1-8]".
+in[2-9]_input           Measured output voltage.
+in[2-9]_min             Minimum output voltage.
+in[2-9]_max             Maximum output voltage.
+in[2-9]_lcrit           Critical minimum output voltage.
+in[2-9]_crit            Critical maximum output voltage.
+in[2-9]_min_alarm       Output voltage low alarm.
+in[2-9]_max_alarm       Output voltage high alarm.
+in[2-9]_lcrit_alarm     Output voltage critical low alarm.
+in[2-9]_crit_alarm      Output voltage critical high alarm.
+in[2-9]_lowest          Lowest output voltage.
+in[2-9]_highest         Lowest output voltage.
+in[2-9]_reset_history   Reset history. Writing into this attribute will reset
+                        history for all attributes.
+
+temp1_input             Measured temperature.
+temp1_min               Mimimum temperature.
+temp1_max               Maximum temperature.
+temp1_lcrit             Critical low temperature.
+temp1_crit              Critical high temperature.
+temp1_min_alarm         Chip temperature low alarm.
+temp1_max_alarm         Chip temperature high alarm.
+temp1_lcrit_alarm       Chip temperature critical low alarm.
+temp1_crit_alarm        Chip temperature critical high alarm.
+temp1_lowest            Lowest measured temperature.
+temp1_highest           Highest measured temperature.
+temp1_reset_history     Reset history. Writing into this attribute will reset
+                        history for all attributes.