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author | Takashi Iwai <tiwai@suse.de> | 2010-08-18 15:17:52 +0200 |
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committer | Takashi Iwai <tiwai@suse.de> | 2010-08-18 15:17:52 +0200 |
commit | e7cfbea9cb7a02ea29fdae5d39c9e3d09102c4d5 (patch) | |
tree | 37c20ec03e70dc7b5df1d02f16b6ac38d8ed1364 /Documentation/hwmon/ltc4245 | |
parent | 7ac03db84baa204d7d280401ed65842541ed1078 (diff) | |
parent | 56385a12d9bb9e173751f74b6c430742018cafc0 (diff) | |
download | linux-stable-e7cfbea9cb7a02ea29fdae5d39c9e3d09102c4d5.tar.gz linux-stable-e7cfbea9cb7a02ea29fdae5d39c9e3d09102c4d5.tar.bz2 linux-stable-e7cfbea9cb7a02ea29fdae5d39c9e3d09102c4d5.zip |
Merge branch 'fix/misc' into topic/misc
Diffstat (limited to 'Documentation/hwmon/ltc4245')
-rw-r--r-- | Documentation/hwmon/ltc4245 | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/Documentation/hwmon/ltc4245 b/Documentation/hwmon/ltc4245 index 86b5880d8502..b478b0864965 100644 --- a/Documentation/hwmon/ltc4245 +++ b/Documentation/hwmon/ltc4245 @@ -72,9 +72,31 @@ in6_min_alarm 5v output undervoltage alarm in7_min_alarm 3v output undervoltage alarm in8_min_alarm Vee (-12v) output undervoltage alarm -in9_input GPIO voltage data +in9_input GPIO voltage data (see note 1) +in10_input GPIO voltage data (see note 1) +in11_input GPIO voltage data (see note 1) power1_input 12v power usage (mW) power2_input 5v power usage (mW) power3_input 3v power usage (mW) power4_input Vee (-12v) power usage (mW) + + +Note 1 +------ + +If you have NOT configured the driver to sample all GPIO pins as analog +voltages, then the in10_input and in11_input sysfs attributes will not be +created. The driver will sample the GPIO pin that is currently connected to the +ADC as an analog voltage, and report the value in in9_input. + +If you have configured the driver to sample all GPIO pins as analog voltages, +then they will be sampled in round-robin fashion. If userspace reads too +slowly, -EAGAIN will be returned when you read the sysfs attribute containing +the sensor reading. + +The LTC4245 chip can be configured to sample all GPIO pins with two methods: +1) platform data -- see include/linux/i2c/ltc4245.h +2) OF device tree -- add the "ltc4245,use-extra-gpios" property to each chip + +The default mode of operation is to sample a single GPIO pin. |