Diffstat (limited to 'Documentation/hwmon')
3 files changed, 101 insertions, 0 deletions
diff --git a/Documentation/hwmon/da9052 b/Documentation/hwmon/da9052
new file mode 100644
@@ -0,0 +1,61 @@
+ * Dialog Semiconductors DA9052-BC and DA9053-AA/Bx PMICs
+ Prefix: 'da9052'
+ Datasheet: Datasheet is not publicly available.
+Authors: David Dajun Chen <firstname.lastname@example.org>
+The DA9052/53 provides an Analogue to Digital Converter (ADC) with 10 bits
+resolution and track and hold circuitry combined with an analogue input
+multiplexer. The analogue input multiplexer will allow conversion of up to 10
+different inputs. The track and hold circuit ensures stable input voltages at
+the input of the ADC during the conversion.
+The ADC is used to measure the following inputs:
+Channel 0: VDDOUT - measurement of the system voltage
+Channel 1: ICH - internal battery charger current measurement
+Channel 2: TBAT - output from the battery NTC
+Channel 3: VBAT - measurement of the battery voltage
+Channel 4: ADC_IN4 - high impedance input (0 - 2.5V)
+Channel 5: ADC_IN5 - high impedance input (0 - 2.5V)
+Channel 6: ADC_IN6 - high impedance input (0 - 2.5V)
+Channel 7: XY - TSI interface to measure the X and Y voltage of the touch
+ screen resistive potentiometers
+Channel 8: Internal Tjunc. - sense (internal temp. sensor)
+Channel 9: VBBAT - measurement of the backup battery voltage
+By using sysfs attributes we can measure the system voltage VDDOUT, the battery
+charging current ICH, battery temperature TBAT, battery junction temperature
+TJUNC, battery voltage VBAT and the back up battery voltage VBBAT.
+Voltages are sampled by a 10 bit ADC.
+The battery voltage is calculated as:
+ Milli volt = ((ADC value * 1000) / 512) + 2500
+The backup battery voltage is calculated as:
+ Milli volt = (ADC value * 2500) / 512;
+The voltages on ADC channels 4, 5 and 6 are calculated as:
+ Milli volt = (ADC value * 2500) / 1023
+Temperatures are sampled by a 10 bit ADC. Junction and battery temperatures
+are monitored by the ADC channels.
+The junction temperature is calculated:
+ Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
+The junction temperature attribute is supported by the driver.
+The battery temperature is calculated:
+ Degree Celcius = 1 / (t1 + 1/298)- 273
+where t1 = (1/B)* ln(( ADCval * 2.5)/(R25*ITBAT*255))
+Default values of R25, B, ITBAT are 10e3, 3380 and 50e-6 respectively.
diff --git a/Documentation/hwmon/hih6130 b/Documentation/hwmon/hih6130
new file mode 100644
@@ -0,0 +1,37 @@
+Kernel driver hih6130
+ * Honeywell HIH-6130 / HIH-6131
+ Prefix: 'hih6130'
+ Addresses scanned: none
+ Datasheet: Publicly available at the Honeywell website
+ Iain Paton <email@example.com>
+The HIH-6130 & HIH-6131 are humidity and temperature sensors in a SO8 package.
+The difference between the two devices is that the HIH-6131 has a condensation
+The devices communicate with the I2C protocol. All sensors are set to the same
+I2C address 0x27 by default, so an entry with I2C_BOARD_INFO("hih6130", 0x27)
+can be used in the board setup code.
+Please see Documentation/i2c/instantiating-devices for details on how to
+instantiate I2C devices.
+temp1_input - temperature input
+humidity1_input - humidity input
+Command mode and alarms are not currently supported.
diff --git a/Documentation/hwmon/submitting-patches b/Documentation/hwmon/submitting-patches
index 86f42e8e9e4..790f774a303 100644
@@ -70,6 +70,9 @@ increase the chances of your change being accepted.
review more difficult. It may also result in code which is more complicated
than necessary. Use inline functions or just regular functions instead.
+* Use devres functions whenever possible to allocate resources. For rationale
+ and supported functions, please see Documentation/driver-model/devres.txt.
* If the driver has a detect function, make sure it is silent. Debug messages
and messages printed after a successful detection are acceptable, but it
must not print messages such as "Chip XXX not found/supported".